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hmm related patches for 5.4 

This is more cleanup and consolidation of the hmm APIs and the very
 strongly related mmu_notifier interfaces. Many places across the tree
 using these interfaces are touched in the process. Beyond that a cleanup
 to the page walker API and a few memremap related changes round out the
 series:
 
 - General improvement of hmm_range_fault() and related APIs, more
   documentation, bug fixes from testing, API simplification &
   consolidation, and unused API removal
 
 - Simplify the hmm related kconfigs to HMM_MIRROR and DEVICE_PRIVATE, and
   make them internal kconfig selects
 
 - Hoist a lot of code related to mmu notifier attachment out of drivers by
   using a refcount get/put attachment idiom and remove the convoluted
   mmu_notifier_unregister_no_release() and related APIs.
 
 - General API improvement for the migrate_vma API and revision of its only
   user in nouveau
 
 - Annotate mmu_notifiers with lockdep and sleeping region debugging
 
 Two series unrelated to HMM or mmu_notifiers came along due to
 dependencies:
 
 - Allow pagemap's memremap_pages family of APIs to work without providing
   a struct device
 
 - Make walk_page_range() and related use a constant structure for function
   pointers
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Merge tag 'for-linus-hmm' of git://git.kernel.org/pub/scm/linux/kernel/git/rdma/rdma

Pull hmm updates from Jason Gunthorpe:
 "This is more cleanup and consolidation of the hmm APIs and the very
  strongly related mmu_notifier interfaces. Many places across the tree
  using these interfaces are touched in the process. Beyond that a
  cleanup to the page walker API and a few memremap related changes
  round out the series:

   - General improvement of hmm_range_fault() and related APIs, more
     documentation, bug fixes from testing, API simplification &
     consolidation, and unused API removal

   - Simplify the hmm related kconfigs to HMM_MIRROR and DEVICE_PRIVATE,
     and make them internal kconfig selects

   - Hoist a lot of code related to mmu notifier attachment out of
     drivers by using a refcount get/put attachment idiom and remove the
     convoluted mmu_notifier_unregister_no_release() and related APIs.

   - General API improvement for the migrate_vma API and revision of its
     only user in nouveau

   - Annotate mmu_notifiers with lockdep and sleeping region debugging

  Two series unrelated to HMM or mmu_notifiers came along due to
  dependencies:

   - Allow pagemap's memremap_pages family of APIs to work without
     providing a struct device

   - Make walk_page_range() and related use a constant structure for
     function pointers"

* tag 'for-linus-hmm' of git://git.kernel.org/pub/scm/linux/kernel/git/rdma/rdma: (75 commits)
  libnvdimm: Enable unit test infrastructure compile checks
  mm, notifier: Catch sleeping/blocking for !blockable
  kernel.h: Add non_block_start/end()
  drm/radeon: guard against calling an unpaired radeon_mn_unregister()
  csky: add missing brackets in a macro for tlb.h
  pagewalk: use lockdep_assert_held for locking validation
  pagewalk: separate function pointers from iterator data
  mm: split out a new pagewalk.h header from mm.h
  mm/mmu_notifiers: annotate with might_sleep()
  mm/mmu_notifiers: prime lockdep
  mm/mmu_notifiers: add a lockdep map for invalidate_range_start/end
  mm/mmu_notifiers: remove the __mmu_notifier_invalidate_range_start/end exports
  mm/hmm: hmm_range_fault() infinite loop
  mm/hmm: hmm_range_fault() NULL pointer bug
  mm/hmm: fix hmm_range_fault()'s handling of swapped out pages
  mm/mmu_notifiers: remove unregister_no_release
  RDMA/odp: remove ib_ucontext from ib_umem
  RDMA/odp: use mmu_notifier_get/put for 'struct ib_ucontext_per_mm'
  RDMA/mlx5: Use odp instead of mr->umem in pagefault_mr
  RDMA/mlx5: Use ib_umem_start instead of umem.address
  ...
This commit is contained in:
Linus Torvalds 2019-09-21 10:07:42 -07:00
parent 227c3e9eb5 62974fc389
commit 84da111de0
65 changed files with 1715 additions and 2215 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

73
Documentation/vm/hmm.rst
View File

@ -192,15 +192,14 @@ read only, or fully unmap, etc.). The device must complete the update before
the driver callback returns.
When the device driver wants to populate a range of virtual addresses, it can
use either::
use::
long hmm_range_snapshot(struct hmm_range *range);
long hmm_range_fault(struct hmm_range *range, bool block);
long hmm_range_fault(struct hmm_range *range, unsigned int flags);
The first one (hmm_range_snapshot()) will only fetch present CPU page table
With the HMM_RANGE_SNAPSHOT flag, it will only fetch present CPU page table
entries and will not trigger a page fault on missing or non-present entries.
The second one does trigger a page fault on missing or read-only entries if
write access is requested (see below). Page faults use the generic mm page
Without that flag, it does trigger a page fault on missing or read-only entries
if write access is requested (see below). Page faults use the generic mm page
fault code path just like a CPU page fault.
Both functions copy CPU page table entries into their pfns array argument. Each
@ -223,24 +222,24 @@ The usage pattern is::
range.flags = ...;
range.values = ...;
range.pfn_shift = ...;
hmm_range_register(&range);
hmm_range_register(&range, mirror);
/*
* Just wait for range to be valid, safe to ignore return value as we
* will use the return value of hmm_range_snapshot() below under the
* will use the return value of hmm_range_fault() below under the
* mmap_sem to ascertain the validity of the range.
*/
hmm_range_wait_until_valid(&range, TIMEOUT_IN_MSEC);
again:
down_read(&mm->mmap_sem);
ret = hmm_range_snapshot(&range);
ret = hmm_range_fault(&range, HMM_RANGE_SNAPSHOT);
if (ret) {
up_read(&mm->mmap_sem);
if (ret == -EBUSY) {
/*
* No need to check hmm_range_wait_until_valid() return value
* on retry we will get proper error with hmm_range_snapshot()
* on retry we will get proper error with hmm_range_fault()
*/
hmm_range_wait_until_valid(&range, TIMEOUT_IN_MSEC);
goto again;
@ -340,58 +339,8 @@ Migration to and from device memory
===================================
Because the CPU cannot access device memory, migration must use the device DMA
engine to perform copy from and to device memory. For this we need a new
migration helper::
int migrate_vma(const struct migrate_vma_ops *ops,
struct vm_area_struct *vma,
unsigned long mentries,
unsigned long start,
unsigned long end,
unsigned long *src,
unsigned long *dst,
void *private);
Unlike other migration functions it works on a range of virtual address, there
are two reasons for that. First, device DMA copy has a high setup overhead cost
and thus batching multiple pages is needed as otherwise the migration overhead
makes the whole exercise pointless. The second reason is because the
migration might be for a range of addresses the device is actively accessing.
The migrate_vma_ops struct defines two callbacks. First one (alloc_and_copy())
controls destination memory allocation and copy operation. Second one is there
to allow the device driver to perform cleanup operations after migration::
struct migrate_vma_ops {
void (*alloc_and_copy)(struct vm_area_struct *vma,
const unsigned long *src,
unsigned long *dst,
unsigned long start,
unsigned long end,
void *private);
void (*finalize_and_map)(struct vm_area_struct *vma,
const unsigned long *src,
const unsigned long *dst,
unsigned long start,
unsigned long end,
void *private);
};
It is important to stress that these migration helpers allow for holes in the
virtual address range. Some pages in the range might not be migrated for all
the usual reasons (page is pinned, page is locked, ...). This helper does not
fail but just skips over those pages.
The alloc_and_copy() might decide to not migrate all pages in the
range (for reasons under the callback control). For those, the callback just
has to leave the corresponding dst entry empty.
Finally, the migration of the struct page might fail (for file backed page) for
various reasons (failure to freeze reference, or update page cache, ...). If
that happens, then the finalize_and_map() can catch any pages that were not
migrated. Note those pages were still copied to a new page and thus we wasted
bandwidth but this is considered as a rare event and a price that we are
willing to pay to keep all the code simpler.
engine to perform copy from and to device memory. For this we need to use
migrate_vma_setup(), migrate_vma_pages(), and migrate_vma_finalize() helpers.
Memory cgroup (memcg) and rss accounting

8
arch/csky/include/asm/tlb.h
View File

@ -8,14 +8,14 @@
#define tlb_start_vma(tlb, vma) \
do { \
if (!tlb->fullmm) \
flush_cache_range(vma, vma->vm_start, vma->vm_end); \
if (!(tlb)->fullmm) \
flush_cache_range(vma, (vma)->vm_start, (vma)->vm_end); \
} while (0)
#define tlb_end_vma(tlb, vma) \
do { \
if (!tlb->fullmm) \
flush_tlb_range(vma, vma->vm_start, vma->vm_end); \
if (!(tlb)->fullmm) \
flush_tlb_range(vma, (vma)->vm_start, (vma)->vm_end); \
} while (0)
#define tlb_flush(tlb) flush_tlb_mm((tlb)->mm)

23
arch/openrisc/kernel/dma.c
View File

@ -16,6 +16,7 @@
*/
#include <linux/dma-noncoherent.h>
#include <linux/pagewalk.h>
#include <asm/cpuinfo.h>
#include <asm/spr_defs.h>
@ -43,6 +44,10 @@ page_set_nocache(pte_t *pte, unsigned long addr,
return 0;
}
static const struct mm_walk_ops set_nocache_walk_ops = {
.pte_entry = page_set_nocache,
};
static int
page_clear_nocache(pte_t *pte, unsigned long addr,
unsigned long next, struct mm_walk *walk)
@ -58,6 +63,10 @@ page_clear_nocache(pte_t *pte, unsigned long addr,
return 0;
}
static const struct mm_walk_ops clear_nocache_walk_ops = {
.pte_entry = page_clear_nocache,
};
/*
* Alloc "coherent" memory, which for OpenRISC means simply uncached.
*
@ -80,10 +89,6 @@ arch_dma_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle,
{
unsigned long va;
void *page;
struct mm_walk walk = {
.pte_entry = page_set_nocache,
.mm = &init_mm
};
page = alloc_pages_exact(size, gfp | __GFP_ZERO);
if (!page)
@ -98,7 +103,8 @@ arch_dma_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle,
* We need to iterate through the pages, clearing the dcache for
* them and setting the cache-inhibit bit.
*/
if (walk_page_range(va, va + size, &walk)) {
if (walk_page_range(&init_mm, va, va + size, &set_nocache_walk_ops,
NULL)) {
free_pages_exact(page, size);
return NULL;
}
@ -111,13 +117,10 @@ arch_dma_free(struct device *dev, size_t size, void *vaddr,
dma_addr_t dma_handle, unsigned long attrs)
{
unsigned long va = (unsigned long)vaddr;
struct mm_walk walk = {
.pte_entry = page_clear_nocache,
.mm = &init_mm
};
/* walk_page_range shouldn't be able to fail here */
WARN_ON(walk_page_range(va, va + size, &walk));
WARN_ON(walk_page_range(&init_mm, va, va + size,
&clear_nocache_walk_ops, NULL));
free_pages_exact(vaddr, size);
}

12
arch/powerpc/mm/book3s64/subpage_prot.c
View File

@ -7,7 +7,7 @@
#include <linux/kernel.h>
#include <linux/gfp.h>
#include <linux/types.h>
#include <linux/mm.h>
#include <linux/pagewalk.h>
#include <linux/hugetlb.h>
#include <linux/syscalls.h>
@ -139,14 +139,14 @@ static int subpage_walk_pmd_entry(pmd_t *pmd, unsigned long addr,
return 0;
}
static const struct mm_walk_ops subpage_walk_ops = {
.pmd_entry = subpage_walk_pmd_entry,
};
static void subpage_mark_vma_nohuge(struct mm_struct *mm, unsigned long addr,
unsigned long len)
{
struct vm_area_struct *vma;
struct mm_walk subpage_proto_walk = {
.mm = mm,
.pmd_entry = subpage_walk_pmd_entry,
};
/*
* We don't try too hard, we just mark all the vma in that range
@ -163,7 +163,7 @@ static void subpage_mark_vma_nohuge(struct mm_struct *mm, unsigned long addr,
if (vma->vm_start >= (addr + len))
break;
vma->vm_flags |= VM_NOHUGEPAGE;
walk_page_vma(vma, &subpage_proto_walk);
walk_page_vma(vma, &subpage_walk_ops, NULL);
vma = vma->vm_next;
}
}

35
arch/s390/mm/gmap.c
View File

@ -9,7 +9,7 @@
*/
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/pagewalk.h>
#include <linux/swap.h>
#include <linux/smp.h>
#include <linux/spinlock.h>
@ -2521,13 +2521,9 @@ static int __zap_zero_pages(pmd_t *pmd, unsigned long start,
return 0;
}
static inline void zap_zero_pages(struct mm_struct *mm)
{
struct mm_walk walk = { .pmd_entry = __zap_zero_pages };
walk.mm = mm;
walk_page_range(0, TASK_SIZE, &walk);
}
static const struct mm_walk_ops zap_zero_walk_ops = {
.pmd_entry = __zap_zero_pages,
};
/*
* switch on pgstes for its userspace process (for kvm)
@ -2546,7 +2542,7 @@ int s390_enable_sie(void)
mm->context.has_pgste = 1;
/* split thp mappings and disable thp for future mappings */
thp_split_mm(mm);
zap_zero_pages(mm);
walk_page_range(mm, 0, TASK_SIZE, &zap_zero_walk_ops, NULL);
up_write(&mm->mmap_sem);
return 0;
}
@ -2589,12 +2585,13 @@ static int __s390_enable_skey_hugetlb(pte_t *pte, unsigned long addr,
return 0;
}
static const struct mm_walk_ops enable_skey_walk_ops = {
.hugetlb_entry = __s390_enable_skey_hugetlb,
.pte_entry = __s390_enable_skey_pte,
};
int s390_enable_skey(void)
{
struct mm_walk walk = {
.hugetlb_entry = __s390_enable_skey_hugetlb,
.pte_entry = __s390_enable_skey_pte,
};
struct mm_struct *mm = current->mm;
struct vm_area_struct *vma;
int rc = 0;
@ -2614,8 +2611,7 @@ int s390_enable_skey(void)
}
mm->def_flags &= ~VM_MERGEABLE;
walk.mm = mm;
walk_page_range(0, TASK_SIZE, &walk);
walk_page_range(mm, 0, TASK_SIZE, &enable_skey_walk_ops, NULL);
out_up:
up_write(&mm->mmap_sem);
@ -2633,13 +2629,14 @@ static int __s390_reset_cmma(pte_t *pte, unsigned long addr,
return 0;
}
static const struct mm_walk_ops reset_cmma_walk_ops = {
.pte_entry = __s390_reset_cmma,
};
void s390_reset_cmma(struct mm_struct *mm)
{
struct mm_walk walk = { .pte_entry = __s390_reset_cmma };
down_write(&mm->mmap_sem);
walk.mm = mm;
walk_page_range(0, TASK_SIZE, &walk);
walk_page_range(mm, 0, TASK_SIZE, &reset_cmma_walk_ops, NULL);
up_write(&mm->mmap_sem);
}
EXPORT_SYMBOL_GPL(s390_reset_cmma);

4
drivers/gpu/drm/amd/amdgpu/Kconfig
View File

@ -27,7 +27,9 @@ config DRM_AMDGPU_CIK
config DRM_AMDGPU_USERPTR
bool "Always enable userptr write support"
depends on DRM_AMDGPU
depends on HMM_MIRROR
depends on MMU
select HMM_MIRROR
select MMU_NOTIFIER
help
This option selects CONFIG_HMM and CONFIG_HMM_MIRROR if it
isn't already selected to enabled full userptr support.

2
drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
View File

@ -35,6 +35,7 @@
#include <linux/pm_runtime.h>
#include <linux/vga_switcheroo.h>
#include <drm/drm_probe_helper.h>
#include <linux/mmu_notifier.h>
#include "amdgpu.h"
#include "amdgpu_irq.h"
@ -1469,6 +1470,7 @@ static void __exit amdgpu_exit(void)
amdgpu_unregister_atpx_handler();
amdgpu_sync_fini();
amdgpu_fence_slab_fini();
mmu_notifier_synchronize();
}
module_init(amdgpu_init);

15
drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c
View File

@ -195,13 +195,14 @@ static void amdgpu_mn_invalidate_node(struct amdgpu_mn_node *node,
* Block for operations on BOs to finish and mark pages as accessed and
* potentially dirty.
*/
static int amdgpu_mn_sync_pagetables_gfx(struct hmm_mirror *mirror,
const struct hmm_update *update)
static int
amdgpu_mn_sync_pagetables_gfx(struct hmm_mirror *mirror,
const struct mmu_notifier_range *update)
{
struct amdgpu_mn *amn = container_of(mirror, struct amdgpu_mn, mirror);
unsigned long start = update->start;
unsigned long end = update->end;
bool blockable = update->blockable;
bool blockable = mmu_notifier_range_blockable(update);
struct interval_tree_node *it;
/* notification is exclusive, but interval is inclusive */
@ -243,13 +244,14 @@ static int amdgpu_mn_sync_pagetables_gfx(struct hmm_mirror *mirror,
* necessitates evicting all user-mode queues of the process. The BOs
* are restorted in amdgpu_mn_invalidate_range_end_hsa.
*/
static int amdgpu_mn_sync_pagetables_hsa(struct hmm_mirror *mirror,
const struct hmm_update *update)
static int
amdgpu_mn_sync_pagetables_hsa(struct hmm_mirror *mirror,
const struct mmu_notifier_range *update)
{
struct amdgpu_mn *amn = container_of(mirror, struct amdgpu_mn, mirror);
unsigned long start = update->start;
unsigned long end = update->end;
bool blockable = update->blockable;
bool blockable = mmu_notifier_range_blockable(update);
struct interval_tree_node *it;
/* notification is exclusive, but interval is inclusive */
@ -482,6 +484,5 @@ void amdgpu_hmm_init_range(struct hmm_range *range)
range->flags = hmm_range_flags;
range->values = hmm_range_values;
range->pfn_shift = PAGE_SHIFT;
INIT_LIST_HEAD(&range->list);
}
}

31
drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
View File

@ -794,7 +794,6 @@ int amdgpu_ttm_tt_get_user_pages(struct amdgpu_bo *bo, struct page **pages)
struct hmm_range *range;
unsigned long i;
uint64_t *pfns;
int retry = 0;
int r = 0;
if (!mm) /* Happens during process shutdown */
@ -835,10 +834,11 @@ int amdgpu_ttm_tt_get_user_pages(struct amdgpu_bo *bo, struct page **pages)
0 : range->flags[HMM_PFN_WRITE];
range->pfn_flags_mask = 0;
range->pfns = pfns;
hmm_range_register(range, mirror, start,
start + ttm->num_pages * PAGE_SIZE, PAGE_SHIFT);
range->start = start;
range->end = start + ttm->num_pages * PAGE_SIZE;
hmm_range_register(range, mirror);
retry:
/*
* Just wait for range to be valid, safe to ignore return value as we
* will use the return value of hmm_range_fault() below under the
@ -847,24 +847,12 @@ retry:
hmm_range_wait_until_valid(range, HMM_RANGE_DEFAULT_TIMEOUT);
down_read(&mm->mmap_sem);
r = hmm_range_fault(range, true);
if (unlikely(r < 0)) {
if (likely(r == -EAGAIN)) {
/*
* return -EAGAIN, mmap_sem is dropped
*/
if (retry++ < MAX_RETRY_HMM_RANGE_FAULT)
goto retry;
else
pr_err("Retry hmm fault too many times\n");
}
goto out_up_read;
}
r = hmm_range_fault(range, 0);
up_read(&mm->mmap_sem);
if (unlikely(r < 0))
goto out_free_pfns;
for (i = 0; i < ttm->num_pages; i++) {
pages[i] = hmm_device_entry_to_page(range, pfns[i]);
if (unlikely(!pages[i])) {
@ -880,9 +868,6 @@ retry:
return 0;
out_up_read:
if (likely(r != -EAGAIN))
up_read(&mm->mmap_sem);
out_free_pfns:
hmm_range_unregister(range);
kvfree(pfns);

3
drivers/gpu/drm/amd/amdkfd/kfd_priv.h
View File

@ -687,9 +687,6 @@ struct kfd_process {
/* We want to receive a notification when the mm_struct is destroyed */
struct mmu_notifier mmu_notifier;
/* Use for delayed freeing of kfd_process structure */
struct rcu_head rcu;
unsigned int pasid;
unsigned int doorbell_index;

88
drivers/gpu/drm/amd/amdkfd/kfd_process.c
View File

@ -62,8 +62,8 @@ static struct workqueue_struct *kfd_restore_wq;
static struct kfd_process *find_process(const struct task_struct *thread);
static void kfd_process_ref_release(struct kref *ref);
static struct kfd_process *create_process(const struct task_struct *thread,
struct file *filep);
static struct kfd_process *create_process(const struct task_struct *thread);
static int kfd_process_init_cwsr_apu(struct kfd_process *p, struct file *filep);
static void evict_process_worker(struct work_struct *work);
static void restore_process_worker(struct work_struct *work);
@ -289,7 +289,15 @@ struct kfd_process *kfd_create_process(struct file *filep)
if (process) {
pr_debug("Process already found\n");
} else {
process = create_process(thread, filep);
process = create_process(thread);
if (IS_ERR(process))
goto out;
ret = kfd_process_init_cwsr_apu(process, filep);
if (ret) {
process = ERR_PTR(ret);
goto out;
}
if (!procfs.kobj)
goto out;
@ -478,11 +486,9 @@ static void kfd_process_ref_release(struct kref *ref)
queue_work(kfd_process_wq, &p->release_work);
}
static void kfd_process_destroy_delayed(struct rcu_head *rcu)
static void kfd_process_free_notifier(struct mmu_notifier *mn)
{
struct kfd_process *p = container_of(rcu, struct kfd_process, rcu);
kfd_unref_process(p);
kfd_unref_process(container_of(mn, struct kfd_process, mmu_notifier));
}
static void kfd_process_notifier_release(struct mmu_notifier *mn,
@ -534,12 +540,12 @@ static void kfd_process_notifier_release(struct mmu_notifier *mn,
mutex_unlock(&p->mutex);
mmu_notifier_unregister_no_release(&p->mmu_notifier, mm);
mmu_notifier_call_srcu(&p->rcu, &kfd_process_destroy_delayed);
mmu_notifier_put(&p->mmu_notifier);
}
static const struct mmu_notifier_ops kfd_process_mmu_notifier_ops = {
.release = kfd_process_notifier_release,
.free_notifier = kfd_process_free_notifier,
};
static int kfd_process_init_cwsr_apu(struct kfd_process *p, struct file *filep)
@ -609,17 +615,30 @@ static int kfd_process_device_init_cwsr_dgpu(struct kfd_process_device *pdd)
return 0;
}
static struct kfd_process *create_process(const struct task_struct *thread,
struct file *filep)
/*
* On return the kfd_process is fully operational and will be freed when the
* mm is released
*/
static struct kfd_process *create_process(const struct task_struct *thread)
{
struct kfd_process *process;
int err = -ENOMEM;
process = kzalloc(sizeof(*process), GFP_KERNEL);
if (!process)
goto err_alloc_process;
kref_init(&process->ref);
mutex_init(&process->mutex);
process->mm = thread->mm;
process->lead_thread = thread->group_leader;
INIT_LIST_HEAD(&process->per_device_data);
INIT_DELAYED_WORK(&process->eviction_work, evict_process_worker);
INIT_DELAYED_WORK(&process->restore_work, restore_process_worker);
process->last_restore_timestamp = get_jiffies_64();
kfd_event_init_process(process);
process->is_32bit_user_mode = in_compat_syscall();
process->pasid = kfd_pasid_alloc();
if (process->pasid == 0)
goto err_alloc_pasid;
@ -627,63 +646,38 @@ static struct kfd_process *create_process(const struct task_struct *thread,
if (kfd_alloc_process_doorbells(process) < 0)
goto err_alloc_doorbells;
kref_init(&process->ref);
mutex_init(&process->mutex);
process->mm = thread->mm;
/* register notifier */
process->mmu_notifier.ops = &kfd_process_mmu_notifier_ops;
err = mmu_notifier_register(&process->mmu_notifier, process->mm);
if (err)
goto err_mmu_notifier;
hash_add_rcu(kfd_processes_table, &process->kfd_processes,
(uintptr_t)process->mm);
process->lead_thread = thread->group_leader;
get_task_struct(process->lead_thread);
INIT_LIST_HEAD(&process->per_device_data);
kfd_event_init_process(process);
err = pqm_init(&process->pqm, process);
if (err != 0)
goto err_process_pqm_init;
/* init process apertures*/
process->is_32bit_user_mode = in_compat_syscall();
err = kfd_init_apertures(process);
if (err != 0)
goto err_init_apertures;
INIT_DELAYED_WORK(&process->eviction_work, evict_process_worker);
INIT_DELAYED_WORK(&process->restore_work, restore_process_worker);
process->last_restore_timestamp = get_jiffies_64();
err = kfd_process_init_cwsr_apu(process, filep);
/* Must be last, have to use release destruction after this */
process->mmu_notifier.ops = &kfd_process_mmu_notifier_ops;
err = mmu_notifier_register(&process->mmu_notifier, process->mm);
if (err)
goto err_init_cwsr;
goto err_register_notifier;
get_task_struct(process->lead_thread);
hash_add_rcu(kfd_processes_table, &process->kfd_processes,
(uintptr_t)process->mm);
return process;
err_init_cwsr:
err_register_notifier:
kfd_process_free_outstanding_kfd_bos(process);
kfd_process_destroy_pdds(process);
err_init_apertures:
pqm_uninit(&process->pqm);
err_process_pqm_init:
hash_del_rcu(&process->kfd_processes);
synchronize_rcu();
mmu_notifier_unregister_no_release(&process->mmu_notifier, process->mm);
err_mmu_notifier:
mutex_destroy(&process->mutex);
kfd_free_process_doorbells(process);
err_alloc_doorbells:
kfd_pasid_free(process->pasid);
err_alloc_pasid:
mutex_destroy(&process->mutex);
kfree(process);
err_alloc_process:
return ERR_PTR(err);

5
drivers/gpu/drm/nouveau/Kconfig
View File

@ -86,9 +86,10 @@ config DRM_NOUVEAU_SVM
bool "(EXPERIMENTAL) Enable SVM (Shared Virtual Memory) support"
depends on DEVICE_PRIVATE
depends on DRM_NOUVEAU
depends on HMM_MIRROR
depends on MMU
depends on STAGING
select MIGRATE_VMA_HELPER
select HMM_MIRROR
select MMU_NOTIFIER
default n
help
Say Y here if you want to enable experimental support for

456
drivers/gpu/drm/nouveau/nouveau_dmem.c
View File

@ -44,8 +44,6 @@
#define DMEM_CHUNK_SIZE (2UL << 20)
#define DMEM_CHUNK_NPAGES (DMEM_CHUNK_SIZE >> PAGE_SHIFT)
struct nouveau_migrate;
enum nouveau_aper {
NOUVEAU_APER_VIRT,
NOUVEAU_APER_VRAM,
@ -86,21 +84,13 @@ static inline struct nouveau_dmem *page_to_dmem(struct page *page)
return container_of(page->pgmap, struct nouveau_dmem, pagemap);
}
struct nouveau_dmem_fault {
struct nouveau_drm *drm;
struct nouveau_fence *fence;
dma_addr_t *dma;
unsigned long npages;
};
static unsigned long nouveau_dmem_page_addr(struct page *page)
{
struct nouveau_dmem_chunk *chunk = page->zone_device_data;
unsigned long idx = page_to_pfn(page) - chunk->pfn_first;
struct nouveau_migrate {
struct vm_area_struct *vma;
struct nouveau_drm *drm;
struct nouveau_fence *fence;
unsigned long npages;
dma_addr_t *dma;
unsigned long dma_nr;
};
return (idx << PAGE_SHIFT) + chunk->bo->bo.offset;
}
static void nouveau_dmem_page_free(struct page *page)
{
@ -125,165 +115,90 @@ static void nouveau_dmem_page_free(struct page *page)
spin_unlock(&chunk->lock);
}
static void
nouveau_dmem_fault_alloc_and_copy(struct vm_area_struct *vma,
const unsigned long *src_pfns,
unsigned long *dst_pfns,
unsigned long start,
unsigned long end,
void *private)
static void nouveau_dmem_fence_done(struct nouveau_fence **fence)
{
struct nouveau_dmem_fault *fault = private;
struct nouveau_drm *drm = fault->drm;
struct device *dev = drm->dev->dev;
unsigned long addr, i, npages = 0;
nouveau_migrate_copy_t copy;
int ret;
/* First allocate new memory */
for (addr = start, i = 0; addr < end; addr += PAGE_SIZE, i++) {
struct page *dpage, *spage;
dst_pfns[i] = 0;
spage = migrate_pfn_to_page(src_pfns[i]);
if (!spage || !(src_pfns[i] & MIGRATE_PFN_MIGRATE))
continue;
dpage = alloc_page_vma(GFP_HIGHUSER, vma, addr);
if (!dpage) {
dst_pfns[i] = MIGRATE_PFN_ERROR;
continue;
}
lock_page(dpage);
dst_pfns[i] = migrate_pfn(page_to_pfn(dpage)) |
MIGRATE_PFN_LOCKED;
npages++;
}
/* Allocate storage for DMA addresses, so we can unmap later. */
fault->dma = kmalloc(sizeof(*fault->dma) * npages, GFP_KERNEL);
if (!fault->dma)
goto error;
/* Copy things over */
copy = drm->dmem->migrate.copy_func;
for (addr = start, i = 0; addr < end; addr += PAGE_SIZE, i++) {
struct nouveau_dmem_chunk *chunk;
struct page *spage, *dpage;
u64 src_addr, dst_addr;
dpage = migrate_pfn_to_page(dst_pfns[i]);
if (!dpage || dst_pfns[i] == MIGRATE_PFN_ERROR)
continue;
spage = migrate_pfn_to_page(src_pfns[i]);
if (!spage || !(src_pfns[i] & MIGRATE_PFN_MIGRATE)) {
dst_pfns[i] = MIGRATE_PFN_ERROR;
__free_page(dpage);
continue;
}
fault->dma[fault->npages] =
dma_map_page_attrs(dev, dpage, 0, PAGE_SIZE,
PCI_DMA_BIDIRECTIONAL,
DMA_ATTR_SKIP_CPU_SYNC);
if (dma_mapping_error(dev, fault->dma[fault->npages])) {
dst_pfns[i] = MIGRATE_PFN_ERROR;
__free_page(dpage);
continue;
}
dst_addr = fault->dma[fault->npages++];
chunk = spage->zone_device_data;
src_addr = page_to_pfn(spage) - chunk->pfn_first;
src_addr = (src_addr << PAGE_SHIFT) + chunk->bo->bo.offset;
ret = copy(drm, 1, NOUVEAU_APER_HOST, dst_addr,
NOUVEAU_APER_VRAM, src_addr);
if (ret) {
dst_pfns[i] = MIGRATE_PFN_ERROR;
__free_page(dpage);
continue;
}
}
nouveau_fence_new(drm->dmem->migrate.chan, false, &fault->fence);
return;
error:
for (addr = start, i = 0; addr < end; addr += PAGE_SIZE, ++i) {
struct page *page;
if (!dst_pfns[i] || dst_pfns[i] == MIGRATE_PFN_ERROR)
continue;
page = migrate_pfn_to_page(dst_pfns[i]);
dst_pfns[i] = MIGRATE_PFN_ERROR;
if (page == NULL)
continue;
__free_page(page);
}
}
void nouveau_dmem_fault_finalize_and_map(struct vm_area_struct *vma,
const unsigned long *src_pfns,
const unsigned long *dst_pfns,
unsigned long start,
unsigned long end,
void *private)
{
struct nouveau_dmem_fault *fault = private;
struct nouveau_drm *drm = fault->drm;
if (fault->fence) {
nouveau_fence_wait(fault->fence, true, false);
nouveau_fence_unref(&fault->fence);
if (fence) {
nouveau_fence_wait(*fence, true, false);
nouveau_fence_unref(fence);
} else {
/*
* FIXME wait for channel to be IDLE before calling finalizing
* the hmem object below (nouveau_migrate_hmem_fini()).
* the hmem object.
*/
}
while (fault->npages--) {
dma_unmap_page(drm->dev->dev, fault->dma[fault->npages],
PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
}
kfree(fault->dma);
}
static const struct migrate_vma_ops nouveau_dmem_fault_migrate_ops = {
.alloc_and_copy = nouveau_dmem_fault_alloc_and_copy,
.finalize_and_map = nouveau_dmem_fault_finalize_and_map,
};
static vm_fault_t nouveau_dmem_fault_copy_one(struct nouveau_drm *drm,
struct vm_fault *vmf, struct migrate_vma *args,
dma_addr_t *dma_addr)
{
struct device *dev = drm->dev->dev;
struct page *dpage, *spage;
spage = migrate_pfn_to_page(args->src[0]);
if (!spage || !(args->src[0] & MIGRATE_PFN_MIGRATE))
return 0;
dpage = alloc_page_vma(GFP_HIGHUSER, vmf->vma, vmf->address);
if (!dpage)
return VM_FAULT_SIGBUS;
lock_page(dpage);
*dma_addr = dma_map_page(dev, dpage, 0, PAGE_SIZE, DMA_BIDIRECTIONAL);
if (dma_mapping_error(dev, *dma_addr))
goto error_free_page;
if (drm->dmem->migrate.copy_func(drm, 1, NOUVEAU_APER_HOST, *dma_addr,
NOUVEAU_APER_VRAM, nouveau_dmem_page_addr(spage)))
goto error_dma_unmap;
args->dst[0] = migrate_pfn(page_to_pfn(dpage)) | MIGRATE_PFN_LOCKED;
return 0;
error_dma_unmap:
dma_unmap_page(dev, *dma_addr, PAGE_SIZE, DMA_BIDIRECTIONAL);
error_free_page:
__free_page(dpage);
return VM_FAULT_SIGBUS;
}
static vm_fault_t nouveau_dmem_migrate_to_ram(struct vm_fault *vmf)
{
struct nouveau_dmem *dmem = page_to_dmem(vmf->page);
unsigned long src[1] = {0}, dst[1] = {0};
struct nouveau_dmem_fault fault = { .drm = dmem->drm };
int ret;
struct nouveau_drm *drm = dmem->drm;
struct nouveau_fence *fence;
unsigned long src = 0, dst = 0;
dma_addr_t dma_addr = 0;
vm_fault_t ret;
struct migrate_vma args = {
.vma = vmf->vma,
.start = vmf->address,
.end = vmf->address + PAGE_SIZE,
.src = &src,
.dst = &dst,
};
/*
* FIXME what we really want is to find some heuristic to migrate more
* than just one page on CPU fault. When such fault happens it is very
* likely that more surrounding page will CPU fault too.
*/
ret = migrate_vma(&nouveau_dmem_fault_migrate_ops, vmf->vma,
vmf->address, vmf->address + PAGE_SIZE,
src, dst, &fault);
if (ret)
if (migrate_vma_setup(&args) < 0)
return VM_FAULT_SIGBUS;
if (!args.cpages)
return 0;
if (dst[0] == MIGRATE_PFN_ERROR)
return VM_FAULT_SIGBUS;
ret = nouveau_dmem_fault_copy_one(drm, vmf, &args, &dma_addr);
if (ret || dst == 0)
goto done;
return 0;
nouveau_fence_new(dmem->migrate.chan, false, &fence);
migrate_vma_pages(&args);
nouveau_dmem_fence_done(&fence);
dma_unmap_page(drm->dev->dev, dma_addr, PAGE_SIZE, DMA_BIDIRECTIONAL);
done:
migrate_vma_finalize(&args);
return ret;
}
static const struct dev_pagemap_ops nouveau_dmem_pagemap_ops = {
@ -642,188 +557,115 @@ out_free:
drm->dmem = NULL;
}
static void
nouveau_dmem_migrate_alloc_and_copy(struct vm_area_struct *vma,
const unsigned long *src_pfns,
unsigned long *dst_pfns,
unsigned long start,
unsigned long end,
void *private)
static unsigned long nouveau_dmem_migrate_copy_one(struct nouveau_drm *drm,
unsigned long src, dma_addr_t *dma_addr)
{
struct nouveau_migrate *migrate = private;
struct nouveau_drm *drm = migrate->drm;
struct device *dev = drm->dev->dev;
unsigned long addr, i, npages = 0;
nouveau_migrate_copy_t copy;
int ret;
struct page *dpage, *spage;
/* First allocate new memory */
for (addr = start, i = 0; addr < end; addr += PAGE_SIZE, i++) {
struct page *dpage, *spage;
spage = migrate_pfn_to_page(src);
if (!spage || !(src & MIGRATE_PFN_MIGRATE))
goto out;
dst_pfns[i] = 0;
spage = migrate_pfn_to_page(src_pfns[i]);
if (!spage || !(src_pfns[i] & MIGRATE_PFN_MIGRATE))
continue;
dpage = nouveau_dmem_page_alloc_locked(drm);
if (!dpage)
return 0;
dpage = nouveau_dmem_page_alloc_locked(drm);
if (!dpage)
continue;
*dma_addr = dma_map_page(dev, spage, 0, PAGE_SIZE, DMA_BIDIRECTIONAL);
if (dma_mapping_error(dev, *dma_addr))
goto out_free_page;
dst_pfns[i] = migrate_pfn(page_to_pfn(dpage)) |
MIGRATE_PFN_LOCKED |
MIGRATE_PFN_DEVICE;
npages++;
}
if (drm->dmem->migrate.copy_func(drm, 1, NOUVEAU_APER_VRAM,
nouveau_dmem_page_addr(dpage), NOUVEAU_APER_HOST,
*dma_addr))
goto out_dma_unmap;
if (!npages)
return;
return migrate_pfn(page_to_pfn(dpage)) | MIGRATE_PFN_LOCKED;
/* Allocate storage for DMA addresses, so we can unmap later. */
migrate->dma = kmalloc(sizeof(*migrate->dma) * npages, GFP_KERNEL);
if (!migrate->dma)
goto error;
/* Copy things over */
copy = drm->dmem->migrate.copy_func;
for (addr = start, i = 0; addr < end; addr += PAGE_SIZE, i++) {
struct nouveau_dmem_chunk *chunk;
struct page *spage, *dpage;
u64 src_addr, dst_addr;
dpage = migrate_pfn_to_page(dst_pfns[i]);
if (!dpage || dst_pfns[i] == MIGRATE_PFN_ERROR)
continue;
chunk = dpage->zone_device_data;
dst_addr = page_to_pfn(dpage) - chunk->pfn_first;
dst_addr = (dst_addr << PAGE_SHIFT) + chunk->bo->bo.offset;
spage = migrate_pfn_to_page(src_pfns[i]);
if (!spage || !(src_pfns[i] & MIGRATE_PFN_MIGRATE)) {
nouveau_dmem_page_free_locked(drm, dpage);
dst_pfns[i] = 0;
continue;
}
migrate->dma[migrate->dma_nr] =
dma_map_page_attrs(dev, spage, 0, PAGE_SIZE,
PCI_DMA_BIDIRECTIONAL,
DMA_ATTR_SKIP_CPU_SYNC);
if (dma_mapping_error(dev, migrate->dma[migrate->dma_nr])) {
nouveau_dmem_page_free_locked(drm, dpage);
dst_pfns[i] = 0;
continue;
}
src_addr = migrate->dma[migrate->dma_nr++];
ret = copy(drm, 1, NOUVEAU_APER_VRAM, dst_addr,
NOUVEAU_APER_HOST, src_addr);
if (ret) {
nouveau_dmem_page_free_locked(drm, dpage);
dst_pfns[i] = 0;
continue;
}
}
nouveau_fence_new(drm->dmem->migrate.chan, false, &migrate->fence);
return;
error:
for (addr = start, i = 0; addr < end; addr += PAGE_SIZE, ++i) {
struct page *page;
if (!dst_pfns[i] || dst_pfns[i] == MIGRATE_PFN_ERROR)
continue;
page = migrate_pfn_to_page(dst_pfns[i]);
dst_pfns[i] = MIGRATE_PFN_ERROR;
if (page == NULL)
continue;
__free_page(page);
}
out_dma_unmap:
dma_unmap_page(dev, *dma_addr, PAGE_SIZE, DMA_BIDIRECTIONAL);
out_free_page:
nouveau_dmem_page_free_locked(drm, dpage);
out:
return 0;
}
void nouveau_dmem_migrate_finalize_and_map(struct vm_area_struct *vma,
const unsigned long *src_pfns,
const unsigned long *dst_pfns,
unsigned long start,
unsigned long end,
void *private)
static void nouveau_dmem_migrate_chunk(struct nouveau_drm *drm,
struct migrate_vma *args, dma_addr_t *dma_addrs)
{
struct nouveau_migrate *migrate = private;
struct nouveau_drm *drm = migrate->drm;
struct nouveau_fence *fence;
unsigned long addr = args->start, nr_dma = 0, i;
if (migrate->fence) {
nouveau_fence_wait(migrate->fence, true, false);
nouveau_fence_unref(&migrate->fence);
} else {
/*
* FIXME wait for channel to be IDLE before finalizing
* the hmem object below (nouveau_migrate_hmem_fini()) ?
*/
for (i = 0; addr < args->end; i++) {
args->dst[i] = nouveau_dmem_migrate_copy_one(drm, args->src[i],
dma_addrs + nr_dma);
if (args->dst[i])
nr_dma++;
addr += PAGE_SIZE;
}
while (migrate->dma_nr--) {
dma_unmap_page(drm->dev->dev, migrate->dma[migrate->dma_nr],
PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
}
kfree(migrate->dma);
nouveau_fence_new(drm->dmem->migrate.chan, false, &fence);
migrate_vma_pages(args);
nouveau_dmem_fence_done(&fence);
while (nr_dma--) {
dma_unmap_page(drm->dev->dev, dma_addrs[nr_dma], PAGE_SIZE,
DMA_BIDIRECTIONAL);
}
/*
* FIXME optimization: update GPU page table to point to newly
* migrated memory.
* FIXME optimization: update GPU page table to point to newly migrated
* memory.
*/
migrate_vma_finalize(args);
}
static const struct migrate_vma_ops nouveau_dmem_migrate_ops = {
.alloc_and_copy = nouveau_dmem_migrate_alloc_and_copy,
.finalize_and_map = nouveau_dmem_migrate_finalize_and_map,
};
int
nouveau_dmem_migrate_vma(struct nouveau_drm *drm,
struct vm_area_struct *vma,
unsigned long start,
unsigned long end)
{
unsigned long *src_pfns, *dst_pfns, npages;
struct nouveau_migrate migrate = {0};
unsigned long i, c, max;
int ret = 0;
unsigned long npages = (end - start) >> PAGE_SHIFT;
unsigned long max = min(SG_MAX_SINGLE_ALLOC, npages);
dma_addr_t *dma_addrs;
struct migrate_vma args = {
.vma = vma,
.start = start,
};
unsigned long c, i;
int ret = -ENOMEM;
npages = (end - start) >> PAGE_SHIFT;
max = min(SG_MAX_SINGLE_ALLOC, npages);
src_pfns = kzalloc(sizeof(long) * max, GFP_KERNEL);
if (src_pfns == NULL)
return -ENOMEM;
dst_pfns = kzalloc(sizeof(long) * max, GFP_KERNEL);
if (dst_pfns == NULL) {
kfree(src_pfns);
return -ENOMEM;
}
args.src = kcalloc(max, sizeof(args.src), GFP_KERNEL);
if (!args.src)
goto out;
args.dst = kcalloc(max, sizeof(args.dst), GFP_KERNEL);
if (!args.dst)
goto out_free_src;
dma_addrs = kmalloc_array(max, sizeof(*dma_addrs), GFP_KERNEL);
if (!dma_addrs)
goto out_free_dst;
migrate.drm = drm;
migrate.vma = vma;
migrate.npages = npages;
for (i = 0; i < npages; i += c) {
unsigned long next;
c = min(SG_MAX_SINGLE_ALLOC, npages);
next = start + (c << PAGE_SHIFT);
ret = migrate_vma(&nouveau_dmem_migrate_ops, vma, start,
next, src_pfns, dst_pfns, &migrate);
args.end = start + (c << PAGE_SHIFT);
ret = migrate_vma_setup(&args);
if (ret)
goto out;
start = next;
goto out_free_dma;
if (args.cpages)
nouveau_dmem_migrate_chunk(drm, &args, dma_addrs);
args.start = args.end;
}
ret = 0;
out_free_dma:
kfree(dma_addrs);
out_free_dst:
kfree(args.dst);
out_free_src:
kfree(args.src);
out:
kfree(dst_pfns);
kfree(src_pfns);
return ret;
}
@ -841,11 +683,10 @@ nouveau_dmem_convert_pfn(struct nouveau_drm *drm,
npages = (range->end - range->start) >> PAGE_SHIFT;
for (i = 0; i < npages; ++i) {
struct nouveau_dmem_chunk *chunk;
struct page *page;
uint64_t addr;
page = hmm_pfn_to_page(range, range->pfns[i]);
page = hmm_device_entry_to_page(range, range->pfns[i]);
if (page == NULL)
continue;
@ -859,10 +700,7 @@ nouveau_dmem_convert_pfn(struct nouveau_drm *drm,
continue;
}
chunk = page->zone_device_data;
addr = page_to_pfn(page) - chunk->pfn_first;
addr = (addr + chunk->bo->bo.mem.start) << PAGE_SHIFT;
addr = nouveau_dmem_page_addr(page);
range->pfns[i] &= ((1UL << range->pfn_shift) - 1);
range->pfns[i] |= (addr >> PAGE_SHIFT) << range->pfn_shift;
}

11
drivers/gpu/drm/nouveau/nouveau_dmem.h
View File

@ -45,16 +45,5 @@ static inline void nouveau_dmem_init(struct nouveau_drm *drm) {}
static inline void nouveau_dmem_fini(struct nouveau_drm *drm) {}
static inline void nouveau_dmem_suspend(struct nouveau_drm *drm) {}
static inline void nouveau_dmem_resume(struct nouveau_drm *drm) {}
static inline int nouveau_dmem_migrate_vma(struct nouveau_drm *drm,
struct vm_area_struct *vma,
unsigned long start,
unsigned long end)
{
return 0;
}
static inline void nouveau_dmem_convert_pfn(struct nouveau_drm *drm,
struct hmm_range *range) {}
#endif /* IS_ENABLED(CONFIG_DRM_NOUVEAU_SVM) */
#endif

3
drivers/gpu/drm/nouveau/nouveau_drm.c
View File

@ -28,6 +28,7 @@
#include <linux/pci.h>
#include <linux/pm_runtime.h>
#include <linux/vga_switcheroo.h>
#include <linux/mmu_notifier.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_ioctl.h>
@ -1290,6 +1291,8 @@ nouveau_drm_exit(void)
#ifdef CONFIG_NOUVEAU_PLATFORM_DRIVER
platform_driver_unregister(&nouveau_platform_driver);
#endif
if (IS_ENABLED(CONFIG_DRM_NOUVEAU_SVM))
mmu_notifier_synchronize();
}
module_init(nouveau_drm_init);

23
drivers/gpu/drm/nouveau/nouveau_svm.c
View File

@ -252,13 +252,13 @@ nouveau_svmm_invalidate(struct nouveau_svmm *svmm, u64 start, u64 limit)
static int
nouveau_svmm_sync_cpu_device_pagetables(struct hmm_mirror *mirror,
const struct hmm_update *update)
const struct mmu_notifier_range *update)
{
struct nouveau_svmm *svmm = container_of(mirror, typeof(*svmm), mirror);
unsigned long start = update->start;
unsigned long limit = update->end;
if (!update->blockable)
if (!mmu_notifier_range_blockable(update))
return -EAGAIN;
SVMM_DBG(svmm, "invalidate %016lx-%016lx", start, limit);
@ -485,31 +485,29 @@ nouveau_range_done(struct hmm_range *range)
}
static int
nouveau_range_fault(struct hmm_mirror *mirror, struct hmm_range *range)
nouveau_range_fault(struct nouveau_svmm *svmm, struct hmm_range *range)
{
long ret;
range->default_flags = 0;
range->pfn_flags_mask = -1UL;
ret = hmm_range_register(range, mirror,
range->start, range->end,
PAGE_SHIFT);
ret = hmm_range_register(range, &svmm->mirror);
if (ret) {
up_read(&range->vma->vm_mm->mmap_sem);
up_read(&svmm->mm->mmap_sem);
return (int)ret;
}
if (!hmm_range_wait_until_valid(range, HMM_RANGE_DEFAULT_TIMEOUT)) {
up_read(&range->vma->vm_mm->mmap_sem);
return -EAGAIN;
up_read(&svmm->mm->mmap_sem);
return -EBUSY;
}
ret = hmm_range_fault(range, true);
ret = hmm_range_fault(range, 0);
if (ret <= 0) {
if (ret == 0)
ret = -EBUSY;
up_read(&range->vma->vm_mm->mmap_sem);
up_read(&svmm->mm->mmap_sem);
hmm_range_unregister(range);
return ret;
}
@ -682,7 +680,6 @@ nouveau_svm_fault(struct nvif_notify *notify)
args.i.p.addr + args.i.p.size, fn - fi);
/* Have HMM fault pages within the fault window to the GPU. */
range.vma = vma;
range.start = args.i.p.addr;
range.end = args.i.p.addr + args.i.p.size;
range.pfns = args.phys;
@ -690,7 +687,7 @@ nouveau_svm_fault(struct nvif_notify *notify)
range.values = nouveau_svm_pfn_values;
range.pfn_shift = NVIF_VMM_PFNMAP_V0_ADDR_SHIFT;
again:
ret = nouveau_range_fault(&svmm->mirror, &range);
ret = nouveau_range_fault(svmm, &range);
if (ret == 0) {
mutex_lock(&svmm->mutex);
if (!nouveau_range_done(&range)) {

3
drivers/gpu/drm/radeon/radeon.h
View File

@ -2449,9 +2449,6 @@ struct radeon_device {
/* tracking pinned memory */
u64 vram_pin_size;
u64 gart_pin_size;
struct mutex mn_lock;
DECLARE_HASHTABLE(mn_hash, 7);
};
bool radeon_is_px(struct drm_device *dev);

2
drivers/gpu/drm/radeon/radeon_device.c
View File

@ -1325,8 +1325,6 @@ int radeon_device_init(struct radeon_device *rdev,
init_rwsem(&rdev->pm.mclk_lock);
init_rwsem(&rdev->exclusive_lock);
init_waitqueue_head(&rdev->irq.vblank_queue);
mutex_init(&rdev->mn_lock);
hash_init(rdev->mn_hash);
r = radeon_gem_init(rdev);
if (r)
return r;

2
drivers/gpu/drm/radeon/radeon_drv.c
View File

@ -35,6 +35,7 @@
#include <linux/module.h>
#include <linux/pm_runtime.h>
#include <linux/vga_switcheroo.h>
#include <linux/mmu_notifier.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_drv.h>
@ -623,6 +624,7 @@ static void __exit radeon_exit(void)
{
pci_unregister_driver(pdriver);
radeon_unregister_atpx_handler();
mmu_notifier_synchronize();
}
module_init(radeon_init);

168
drivers/gpu/drm/radeon/radeon_mn.c
View File

@ -37,17 +37,8 @@
#include "radeon.h"
struct radeon_mn {
/* constant after initialisation */
struct radeon_device *rdev;
struct mm_struct *mm;
struct mmu_notifier mn;
/* only used on destruction */
struct work_struct work;
/* protected by rdev->mn_lock */
struct hlist_node node;
/* objects protected by lock */
struct mutex lock;
struct rb_root_cached objects;
@ -58,55 +49,6 @@ struct radeon_mn_node {
struct list_head bos;
};
/**
* radeon_mn_destroy - destroy the rmn
*
* @work: previously sheduled work item
*
* Lazy destroys the notifier from a work item
*/
static void radeon_mn_destroy(struct work_struct *work)
{
struct radeon_mn *rmn = container_of(work, struct radeon_mn, work);
struct radeon_device *rdev = rmn->rdev;
struct radeon_mn_node *node, *next_node;
struct radeon_bo *bo, *next_bo;
mutex_lock(&rdev->mn_lock);
mutex_lock(&rmn->lock);
hash_del(&rmn->node);
rbtree_postorder_for_each_entry_safe(node, next_node,
&rmn->objects.rb_root, it.rb) {
interval_tree_remove(&node->it, &rmn->objects);
list_for_each_entry_safe(bo, next_bo, &node->bos, mn_list) {
bo->mn = NULL;
list_del_init(&bo->mn_list);
}
kfree(node);
}
mutex_unlock(&rmn->lock);
mutex_unlock(&rdev->mn_lock);
mmu_notifier_unregister(&rmn->mn, rmn->mm);
kfree(rmn);
}
/**
* radeon_mn_release - callback to notify about mm destruction
*
* @mn: our notifier
* @mn: the mm this callback is about
*
* Shedule a work item to lazy destroy our notifier.
*/
static void radeon_mn_release(struct mmu_notifier *mn,
struct mm_struct *mm)
{
struct radeon_mn *rmn = container_of(mn, struct radeon_mn, mn);
INIT_WORK(&rmn->work, radeon_mn_destroy);
schedule_work(&rmn->work);
}
/**
* radeon_mn_invalidate_range_start - callback to notify about mm change
*
@ -183,65 +125,44 @@ out_unlock:
return ret;
}
static void radeon_mn_release(struct mmu_notifier *mn, struct mm_struct *mm)
{
struct mmu_notifier_range range = {
.mm = mm,
.start = 0,
.end = ULONG_MAX,
.flags = 0,
.event = MMU_NOTIFY_UNMAP,
};
radeon_mn_invalidate_range_start(mn, &range);
}
static struct mmu_notifier *radeon_mn_alloc_notifier(struct mm_struct *mm)
{
struct radeon_mn *rmn;
rmn = kzalloc(sizeof(*rmn), GFP_KERNEL);
if (!rmn)
return ERR_PTR(-ENOMEM);
mutex_init(&rmn->lock);
rmn->objects = RB_ROOT_CACHED;
return &rmn->mn;
}
static void radeon_mn_free_notifier(struct mmu_notifier *mn)
{
kfree(container_of(mn, struct radeon_mn, mn));
}
static const struct mmu_notifier_ops radeon_mn_ops = {
.release = radeon_mn_release,
.invalidate_range_start = radeon_mn_invalidate_range_start,
.alloc_notifier = radeon_mn_alloc_notifier,
.free_notifier = radeon_mn_free_notifier,
};
/**
* radeon_mn_get - create notifier context
*
* @rdev: radeon device pointer
*
* Creates a notifier context for current->mm.
*/
static struct radeon_mn *radeon_mn_get(struct radeon_device *rdev)
{
struct mm_struct *mm = current->mm;
struct radeon_mn *rmn;
int r;
if (down_write_killable(&mm->mmap_sem))
return ERR_PTR(-EINTR);
mutex_lock(&rdev->mn_lock);
hash_for_each_possible(rdev->mn_hash, rmn, node, (unsigned long)mm)
if (rmn->mm == mm)
goto release_locks;
rmn = kzalloc(sizeof(*rmn), GFP_KERNEL);
if (!rmn) {
rmn = ERR_PTR(-ENOMEM);
goto release_locks;
}
rmn->rdev = rdev;
rmn->mm = mm;
rmn->mn.ops = &radeon_mn_ops;
mutex_init(&rmn->lock);
rmn->objects = RB_ROOT_CACHED;
r = __mmu_notifier_register(&rmn->mn, mm);
if (r)
goto free_rmn;
hash_add(rdev->mn_hash, &rmn->node, (unsigned long)mm);
release_locks:
mutex_unlock(&rdev->mn_lock);
up_write(&mm->mmap_sem);
return rmn;
free_rmn:
mutex_unlock(&rdev->mn_lock);
up_write(&mm->mmap_sem);
kfree(rmn);
return ERR_PTR(r);
}
/**
* radeon_mn_register - register a BO for notifier updates
*
@ -254,15 +175,16 @@ free_rmn:
int radeon_mn_register(struct radeon_bo *bo, unsigned long addr)
{
unsigned long end = addr + radeon_bo_size(bo) - 1;
struct radeon_device *rdev = bo->rdev;
struct mmu_notifier *mn;
struct radeon_mn *rmn;
struct radeon_mn_node *node = NULL;
struct list_head bos;
struct interval_tree_node *it;
rmn = radeon_mn_get(rdev);
if (IS_ERR(rmn))
return PTR_ERR(rmn);
mn = mmu_notifier_get(&radeon_mn_ops, current->mm);
if (IS_ERR(mn))
return PTR_ERR(mn);
rmn = container_of(mn, struct radeon_mn, mn);
INIT_LIST_HEAD(&bos);
@ -309,22 +231,16 @@ int radeon_mn_register(struct radeon_bo *bo, unsigned long addr)
*/
void radeon_mn_unregister(struct radeon_bo *bo)
{
struct radeon_device *rdev = bo->rdev;
struct radeon_mn *rmn;
struct radeon_mn *rmn = bo->mn;
struct list_head *head;
mutex_lock(&rdev->mn_lock);
rmn = bo->mn;
if (rmn == NULL) {
mutex_unlock(&rdev->mn_lock);
if (!rmn)
return;
}
mutex_lock(&rmn->lock);
/* save the next list entry for later */
head = bo->mn_list.next;
bo->mn = NULL;
list_del(&bo->mn_list);
if (list_empty(head)) {
@ -335,5 +251,7 @@ void radeon_mn_unregister(struct radeon_bo *bo)
}
mutex_unlock(&rmn->lock);
mutex_unlock(&rdev->mn_lock);
mmu_notifier_put(&rmn->mn);
bo->mn = NULL;
}

1
drivers/infiniband/Kconfig
View File

@ -55,6 +55,7 @@ config INFINIBAND_ON_DEMAND_PAGING
bool "InfiniBand on-demand paging support"
depends on INFINIBAND_USER_MEM
select MMU_NOTIFIER
select INTERVAL_TREE
default y
---help---
On demand paging support for the InfiniBand subsystem.

1
drivers/infiniband/core/device.c
View File

@ -2562,6 +2562,7 @@ void ib_set_device_ops(struct ib_device *dev, const struct ib_device_ops *ops)
SET_DEVICE_OP(dev_ops, get_vf_config);
SET_DEVICE_OP(dev_ops, get_vf_stats);
SET_DEVICE_OP(dev_ops, init_port);
SET_DEVICE_OP(dev_ops, invalidate_range);
SET_DEVICE_OP(dev_ops, iw_accept);
SET_DEVICE_OP(dev_ops, iw_add_ref);
SET_DEVICE_OP(dev_ops, iw_connect);

54
drivers/infiniband/core/umem.c
View File

@ -184,9 +184,6 @@ EXPORT_SYMBOL(ib_umem_find_best_pgsz);
/**
* ib_umem_get - Pin and DMA map userspace memory.
*
* If access flags indicate ODP memory, avoid pinning. Instead, stores
* the mm for future page fault handling in conjunction with MMU notifiers.
*
* @udata: userspace context to pin memory for
* @addr: userspace virtual address to start at
* @size: length of region to pin
@ -231,36 +228,19 @@ struct ib_umem *ib_umem_get(struct ib_udata *udata, unsigned long addr,
if (!can_do_mlock())
return ERR_PTR(-EPERM);
if (access & IB_ACCESS_ON_DEMAND) {
umem = kzalloc(sizeof(struct ib_umem_odp), GFP_KERNEL);
if (!umem)
return ERR_PTR(-ENOMEM);
umem->is_odp = 1;
} else {
umem = kzalloc(sizeof(*umem), GFP_KERNEL);
if (!umem)
return ERR_PTR(-ENOMEM);
}
if (access & IB_ACCESS_ON_DEMAND)
return ERR_PTR(-EOPNOTSUPP);
umem->context = context;
umem = kzalloc(sizeof(*umem), GFP_KERNEL);
if (!umem)
return ERR_PTR(-ENOMEM);
umem->ibdev = context->device;
umem->length = size;
umem->address = addr;
umem->writable = ib_access_writable(access);
umem->owning_mm = mm = current->mm;
mmgrab(mm);
if (access & IB_ACCESS_ON_DEMAND) {
if (WARN_ON_ONCE(!context->invalidate_range)) {
ret = -EINVAL;
goto umem_kfree;
}
ret = ib_umem_odp_get(to_ib_umem_odp(umem), access);
if (ret)
goto umem_kfree;
return umem;
}
page_list = (struct page **) __get_free_page(GFP_KERNEL);
if (!page_list) {
ret = -ENOMEM;
@ -346,15 +326,6 @@ umem_kfree:
}
EXPORT_SYMBOL(ib_umem_get);
static void __ib_umem_release_tail(struct ib_umem *umem)
{
mmdrop(umem->owning_mm);
if (umem->is_odp)
kfree(to_ib_umem_odp(umem));
else
kfree(umem);
}
/**
* ib_umem_release - release memory pinned with ib_umem_get
* @umem: umem struct to release
@ -363,17 +334,14 @@ void ib_umem_release(struct ib_umem *umem)
{
if (!umem)
return;
if (umem->is_odp)
return ib_umem_odp_release(to_ib_umem_odp(umem));
if (umem->is_odp) {
ib_umem_odp_release(to_ib_umem_odp(umem));
__ib_umem_release_tail(umem);
return;
}
__ib_umem_release(umem->context->device, umem, 1);
__ib_umem_release(umem->ibdev, umem, 1);
atomic64_sub(ib_umem_num_pages(umem), &umem->owning_mm->pinned_vm);
__ib_umem_release_tail(umem);
mmdrop(umem->owning_mm);
kfree(umem);
}
EXPORT_SYMBOL(ib_umem_release);

556
drivers/infiniband/core/umem_odp.c
View File

@ -39,44 +39,14 @@
#include <linux/export.h>
#include <linux/vmalloc.h>
#include <linux/hugetlb.h>
#include <linux/interval_tree_generic.h>
#include <linux/interval_tree.h>
#include <linux/pagemap.h>
#include <rdma/ib_verbs.h>
#include <rdma/ib_umem.h>
#include <rdma/ib_umem_odp.h>
/*
* The ib_umem list keeps track of memory regions for which the HW
* device request to receive notification when the related memory
* mapping is changed.
*
* ib_umem_lock protects the list.
*/
static u64 node_start(struct umem_odp_node *n)
{
struct ib_umem_odp *umem_odp =
container_of(n, struct ib_umem_odp, interval_tree);
return ib_umem_start(umem_odp);
}
/* Note that the representation of the intervals in the interval tree
* considers the ending point as contained in the interval, while the
* function ib_umem_end returns the first address which is not contained
* in the umem.
*/
static u64 node_last(struct umem_odp_node *n)
{
struct ib_umem_odp *umem_odp =
container_of(n, struct ib_umem_odp, interval_tree);
return ib_umem_end(umem_odp) - 1;
}
INTERVAL_TREE_DEFINE(struct umem_odp_node, rb, u64, __subtree_last,
node_start, node_last, static, rbt_ib_umem)
#include "uverbs.h"
static void ib_umem_notifier_start_account(struct ib_umem_odp *umem_odp)
{
@ -104,31 +74,34 @@ static void ib_umem_notifier_end_account(struct ib_umem_odp *umem_odp)
mutex_unlock(&umem_odp->umem_mutex);
}
static int ib_umem_notifier_release_trampoline(struct ib_umem_odp *umem_odp,
u64 start, u64 end, void *cookie)
{
/*
* Increase the number of notifiers running, to
* prevent any further fault handling on this MR.
*/
ib_umem_notifier_start_account(umem_odp);
complete_all(&umem_odp->notifier_completion);
umem_odp->umem.context->invalidate_range(
umem_odp, ib_umem_start(umem_odp), ib_umem_end(umem_odp));
return 0;
}
static void ib_umem_notifier_release(struct mmu_notifier *mn,
struct mm_struct *mm)
{
struct ib_ucontext_per_mm *per_mm =
container_of(mn, struct ib_ucontext_per_mm, mn);
struct rb_node *node;
down_read(&per_mm->umem_rwsem);
if (per_mm->active)
rbt_ib_umem_for_each_in_range(
&per_mm->umem_tree, 0, ULLONG_MAX,
ib_umem_notifier_release_trampoline, true, NULL);
if (!per_mm->mn.users)
goto out;
for (node = rb_first_cached(&per_mm->umem_tree); node;
node = rb_next(node)) {
struct ib_umem_odp *umem_odp =
rb_entry(node, struct ib_umem_odp, interval_tree.rb);
/*
* Increase the number of notifiers running, to prevent any
* further fault handling on this MR.
*/
ib_umem_notifier_start_account(umem_odp);
complete_all(&umem_odp->notifier_completion);
umem_odp->umem.ibdev->ops.invalidate_range(
umem_odp, ib_umem_start(umem_odp),
ib_umem_end(umem_odp));
}
out:
up_read(&per_mm->umem_rwsem);
}
@ -136,7 +109,7 @@ static int invalidate_range_start_trampoline(struct ib_umem_odp *item,
u64 start, u64 end, void *cookie)
{
ib_umem_notifier_start_account(item);
item->umem.context->invalidate_range(item, start, end);
item->umem.ibdev->ops.invalidate_range(item, start, end);
return 0;
}
@ -152,10 +125,10 @@ static int ib_umem_notifier_invalidate_range_start(struct mmu_notifier *mn,
else if (!down_read_trylock(&per_mm->umem_rwsem))
return -EAGAIN;
if (!per_mm->active) {
if (!per_mm->mn.users) {
up_read(&per_mm->umem_rwsem);
/*
* At this point active is permanently set and visible to this
* At this point users is permanently zero and visible to this
* CPU without a lock, that fact is relied on to skip the unlock
* in range_end.
*/
@ -185,7 +158,7 @@ static void ib_umem_notifier_invalidate_range_end(struct mmu_notifier *mn,
struct ib_ucontext_per_mm *per_mm =
container_of(mn, struct ib_ucontext_per_mm, mn);
if (unlikely(!per_mm->active))
if (unlikely(!per_mm->mn.users))
return;
rbt_ib_umem_for_each_in_range(&per_mm->umem_tree, range->start,
@ -194,212 +167,250 @@ static void ib_umem_notifier_invalidate_range_end(struct mmu_notifier *mn,
up_read(&per_mm->umem_rwsem);
}
static const struct mmu_notifier_ops ib_umem_notifiers = {
.release = ib_umem_notifier_release,
.invalidate_range_start = ib_umem_notifier_invalidate_range_start,
.invalidate_range_end = ib_umem_notifier_invalidate_range_end,
};
static void add_umem_to_per_mm(struct ib_umem_odp *umem_odp)
{
struct ib_ucontext_per_mm *per_mm = umem_odp->per_mm;
down_write(&per_mm->umem_rwsem);
if (likely(ib_umem_start(umem_odp) != ib_umem_end(umem_odp)))
rbt_ib_umem_insert(&umem_odp->interval_tree,
&per_mm->umem_tree);
up_write(&per_mm->umem_rwsem);
}
static void remove_umem_from_per_mm(struct ib_umem_odp *umem_odp)
{
struct ib_ucontext_per_mm *per_mm = umem_odp->per_mm;
down_write(&per_mm->umem_rwsem);
if (likely(ib_umem_start(umem_odp) != ib_umem_end(umem_odp)))
rbt_ib_umem_remove(&umem_odp->interval_tree,
&per_mm->umem_tree);
complete_all(&umem_odp->notifier_completion);
up_write(&per_mm->umem_rwsem);
}
static struct ib_ucontext_per_mm *alloc_per_mm(struct ib_ucontext *ctx,
struct mm_struct *mm)
static struct mmu_notifier *ib_umem_alloc_notifier(struct mm_struct *mm)
{
struct ib_ucontext_per_mm *per_mm;
int ret;
per_mm = kzalloc(sizeof(*per_mm), GFP_KERNEL);
if (!per_mm)
return ERR_PTR(-ENOMEM);
per_mm->context = ctx;
per_mm->mm = mm;
per_mm->umem_tree = RB_ROOT_CACHED;
init_rwsem(&per_mm->umem_rwsem);
per_mm->active = true;
WARN_ON(mm != current->mm);
rcu_read_lock();
per_mm->tgid = get_task_pid(current->group_leader, PIDTYPE_PID);
rcu_read_unlock();
WARN_ON(mm != current->mm);
per_mm->mn.ops = &ib_umem_notifiers;
ret = mmu_notifier_register(&per_mm->mn, per_mm->mm);
if (ret) {
dev_err(&ctx->device->dev,
"Failed to register mmu_notifier %d\n", ret);
goto out_pid;
}
list_add(&per_mm->ucontext_list, &ctx->per_mm_list);
return per_mm;
out_pid:
put_pid(per_mm->tgid);
kfree(per_mm);
return ERR_PTR(ret);
return &per_mm->mn;
}
static int get_per_mm(struct ib_umem_odp *umem_odp)
static void ib_umem_free_notifier(struct mmu_notifier *mn)
{
struct ib_ucontext *ctx = umem_odp->umem.context;
struct ib_ucontext_per_mm *per_mm;
/*
* Generally speaking we expect only one or two per_mm in this list,
* so no reason to optimize this search today.
*/
mutex_lock(&ctx->per_mm_list_lock);
list_for_each_entry(per_mm, &ctx->per_mm_list, ucontext_list) {
if (per_mm->mm == umem_odp->umem.owning_mm)
goto found;
}
per_mm = alloc_per_mm(ctx, umem_odp->umem.owning_mm);
if (IS_ERR(per_mm)) {
mutex_unlock(&ctx->per_mm_list_lock);
return PTR_ERR(per_mm);
}
found:
umem_odp->per_mm = per_mm;
per_mm->odp_mrs_count++;
mutex_unlock(&ctx->per_mm_list_lock);
return 0;
}
static void free_per_mm(struct rcu_head *rcu)
{
kfree(container_of(rcu, struct ib_ucontext_per_mm, rcu));
}
static void put_per_mm(struct ib_umem_odp *umem_odp)
{
struct ib_ucontext_per_mm *per_mm = umem_odp->per_mm;
struct ib_ucontext *ctx = umem_odp->umem.context;
bool need_free;
mutex_lock(&ctx->per_mm_list_lock);
umem_odp->per_mm = NULL;
per_mm->odp_mrs_count--;
need_free = per_mm->odp_mrs_count == 0;
if (need_free)
list_del(&per_mm->ucontext_list);
mutex_unlock(&ctx->per_mm_list_lock);
if (!need_free)
return;
/*
* NOTE! mmu_notifier_unregister() can happen between a start/end
* callback, resulting in an start/end, and thus an unbalanced
* lock. This doesn't really matter to us since we are about to kfree
* the memory that holds the lock, however LOCKDEP doesn't like this.
*/
down_write(&per_mm->umem_rwsem);
per_mm->active = false;
up_write(&per_mm->umem_rwsem);
struct ib_ucontext_per_mm *per_mm =
container_of(mn, struct ib_ucontext_per_mm, mn);
WARN_ON(!RB_EMPTY_ROOT(&per_mm->umem_tree.rb_root));
mmu_notifier_unregister_no_release(&per_mm->mn, per_mm->mm);
put_pid(per_mm->tgid);
mmu_notifier_call_srcu(&per_mm->rcu, free_per_mm);
kfree(per_mm);
}
struct ib_umem_odp *ib_alloc_odp_umem(struct ib_umem_odp *root,
unsigned long addr, size_t size)
static const struct mmu_notifier_ops ib_umem_notifiers = {
.release = ib_umem_notifier_release,
.invalidate_range_start = ib_umem_notifier_invalidate_range_start,
.invalidate_range_end = ib_umem_notifier_invalidate_range_end,
.alloc_notifier = ib_umem_alloc_notifier,
.free_notifier = ib_umem_free_notifier,
};
static inline int ib_init_umem_odp(struct ib_umem_odp *umem_odp)
{
struct ib_ucontext_per_mm *per_mm = root->per_mm;
struct ib_ucontext *ctx = per_mm->context;
struct ib_ucontext_per_mm *per_mm;
struct mmu_notifier *mn;
int ret;
umem_odp->umem.is_odp = 1;
if (!umem_odp->is_implicit_odp) {
size_t page_size = 1UL << umem_odp->page_shift;
size_t pages;
umem_odp->interval_tree.start =
ALIGN_DOWN(umem_odp->umem.address, page_size);
if (check_add_overflow(umem_odp->umem.address,
umem_odp->umem.length,
&umem_odp->interval_tree.last))
return -EOVERFLOW;
umem_odp->interval_tree.last =
ALIGN(umem_odp->interval_tree.last, page_size);
if (unlikely(umem_odp->interval_tree.last < page_size))
return -EOVERFLOW;
pages = (umem_odp->interval_tree.last -
umem_odp->interval_tree.start) >>
umem_odp->page_shift;
if (!pages)
return -EINVAL;
/*
* Note that the representation of the intervals in the
* interval tree considers the ending point as contained in
* the interval.
*/
umem_odp->interval_tree.last--;
umem_odp->page_list = kvcalloc(
pages, sizeof(*umem_odp->page_list), GFP_KERNEL);
if (!umem_odp->page_list)
return -ENOMEM;
umem_odp->dma_list = kvcalloc(
pages, sizeof(*umem_odp->dma_list), GFP_KERNEL);
if (!umem_odp->dma_list) {
ret = -ENOMEM;
goto out_page_list;
}
}
mn = mmu_notifier_get(&ib_umem_notifiers, umem_odp->umem.owning_mm);
if (IS_ERR(mn)) {
ret = PTR_ERR(mn);
goto out_dma_list;
}
umem_odp->per_mm = per_mm =
container_of(mn, struct ib_ucontext_per_mm, mn);
mutex_init(&umem_odp->umem_mutex);
init_completion(&umem_odp->notifier_completion);
if (!umem_odp->is_implicit_odp) {
down_write(&per_mm->umem_rwsem);
interval_tree_insert(&umem_odp->interval_tree,
&per_mm->umem_tree);
up_write(&per_mm->umem_rwsem);
}
mmgrab(umem_odp->umem.owning_mm);
return 0;
out_dma_list:
kvfree(umem_odp->dma_list);
out_page_list:
kvfree(umem_odp->page_list);
return ret;
}
/**
* ib_umem_odp_alloc_implicit - Allocate a parent implicit ODP umem
*
* Implicit ODP umems do not have a VA range and do not have any page lists.
* They exist only to hold the per_mm reference to help the driver create
* children umems.
*
* @udata: udata from the syscall being used to create the umem
* @access: ib_reg_mr access flags
*/
struct ib_umem_odp *ib_umem_odp_alloc_implicit(struct ib_udata *udata,
int access)
{
struct ib_ucontext *context =
container_of(udata, struct uverbs_attr_bundle, driver_udata)
->context;
struct ib_umem *umem;
struct ib_umem_odp *umem_odp;
int ret;
if (access & IB_ACCESS_HUGETLB)
return ERR_PTR(-EINVAL);
if (!context)
return ERR_PTR(-EIO);
if (WARN_ON_ONCE(!context->device->ops.invalidate_range))
return ERR_PTR(-EINVAL);
umem_odp = kzalloc(sizeof(*umem_odp), GFP_KERNEL);
if (!umem_odp)
return ERR_PTR(-ENOMEM);
umem = &umem_odp->umem;
umem->ibdev = context->device;
umem->writable = ib_access_writable(access);
umem->owning_mm = current->mm;
umem_odp->is_implicit_odp = 1;
umem_odp->page_shift = PAGE_SHIFT;
ret = ib_init_umem_odp(umem_odp);
if (ret) {
kfree(umem_odp);
return ERR_PTR(ret);
}
return umem_odp;
}
EXPORT_SYMBOL(ib_umem_odp_alloc_implicit);
/**
* ib_umem_odp_alloc_child - Allocate a child ODP umem under an implicit
* parent ODP umem
*
* @root: The parent umem enclosing the child. This must be allocated using
* ib_alloc_implicit_odp_umem()
* @addr: The starting userspace VA
* @size: The length of the userspace VA
*/
struct ib_umem_odp *ib_umem_odp_alloc_child(struct ib_umem_odp *root,
unsigned long addr, size_t size)
{
/*
* Caller must ensure that root cannot be freed during the call to
* ib_alloc_odp_umem.
*/
struct ib_umem_odp *odp_data;
struct ib_umem *umem;
int pages = size >> PAGE_SHIFT;
int ret;
if (WARN_ON(!root->is_implicit_odp))
return ERR_PTR(-EINVAL);
odp_data = kzalloc(sizeof(*odp_data), GFP_KERNEL);
if (!odp_data)
return ERR_PTR(-ENOMEM);
umem = &odp_data->umem;
umem->context = ctx;
umem->ibdev = root->umem.ibdev;
umem->length = size;
umem->address = addr;
odp_data->page_shift = PAGE_SHIFT;
umem->writable = root->umem.writable;
umem->is_odp = 1;
odp_data->per_mm = per_mm;
umem->owning_mm = per_mm->mm;
mmgrab(umem->owning_mm);
umem->owning_mm = root->umem.owning_mm;
odp_data->page_shift = PAGE_SHIFT;
mutex_init(&odp_data->umem_mutex);
init_completion(&odp_data->notifier_completion);
odp_data->page_list =
vzalloc(array_size(pages, sizeof(*odp_data->page_list)));
if (!odp_data->page_list) {
ret = -ENOMEM;
goto out_odp_data;
ret = ib_init_umem_odp(odp_data);
if (ret) {
kfree(odp_data);
return ERR_PTR(ret);
}
odp_data->dma_list =
vzalloc(array_size(pages, sizeof(*odp_data->dma_list)));
if (!odp_data->dma_list) {
ret = -ENOMEM;
goto out_page_list;
}
/*
* Caller must ensure that the umem_odp that the per_mm came from
* cannot be freed during the call to ib_alloc_odp_umem.
*/
mutex_lock(&ctx->per_mm_list_lock);
per_mm->odp_mrs_count++;
mutex_unlock(&ctx->per_mm_list_lock);
add_umem_to_per_mm(odp_data);
return odp_data;
out_page_list:
vfree(odp_data->page_list);
out_odp_data:
mmdrop(umem->owning_mm);
kfree(odp_data);
return ERR_PTR(ret);
}
EXPORT_SYMBOL(ib_alloc_odp_umem);
EXPORT_SYMBOL(ib_umem_odp_alloc_child);
int ib_umem_odp_get(struct ib_umem_odp *umem_odp, int access)
/**
* ib_umem_odp_get - Create a umem_odp for a userspace va
*
* @udata: userspace context to pin memory for
* @addr: userspace virtual address to start at
* @size: length of region to pin
* @access: IB_ACCESS_xxx flags for memory being pinned
*
* The driver should use when the access flags indicate ODP memory. It avoids
* pinning, instead, stores the mm for future page fault handling in
* conjunction with MMU notifiers.
*/
struct ib_umem_odp *ib_umem_odp_get(struct ib_udata *udata, unsigned long addr,
size_t size, int access)
{
struct ib_umem *umem = &umem_odp->umem;
/*
* NOTE: This must called in a process context where umem->owning_mm
* == current->mm
*/
struct mm_struct *mm = umem->owning_mm;
int ret_val;
struct ib_umem_odp *umem_odp;
struct ib_ucontext *context;
struct mm_struct *mm;
int ret;
if (!udata)
return ERR_PTR(-EIO);
context = container_of(udata, struct uverbs_attr_bundle, driver_udata)
->context;
if (!context)
return ERR_PTR(-EIO);
if (WARN_ON_ONCE(!(access & IB_ACCESS_ON_DEMAND)) ||
WARN_ON_ONCE(!context->device->ops.invalidate_range))
return ERR_PTR(-EINVAL);
umem_odp = kzalloc(sizeof(struct ib_umem_odp), GFP_KERNEL);
if (!umem_odp)
return ERR_PTR(-ENOMEM);
umem_odp->umem.ibdev = context->device;
umem_odp->umem.length = size;
umem_odp->umem.address = addr;
umem_odp->umem.writable = ib_access_writable(access);
umem_odp->umem.owning_mm = mm = current->mm;
umem_odp->page_shift = PAGE_SHIFT;
if (access & IB_ACCESS_HUGETLB) {
@ -410,63 +421,63 @@ int ib_umem_odp_get(struct ib_umem_odp *umem_odp, int access)
vma = find_vma(mm, ib_umem_start(umem_odp));
if (!vma || !is_vm_hugetlb_page(vma)) {
up_read(&mm->mmap_sem);
return -EINVAL;
ret = -EINVAL;
goto err_free;
}
h = hstate_vma(vma);
umem_odp->page_shift = huge_page_shift(h);
up_read(&mm->mmap_sem);
}
mutex_init(&umem_odp->umem_mutex);
ret = ib_init_umem_odp(umem_odp);
if (ret)
goto err_free;
return umem_odp;
init_completion(&umem_odp->notifier_completion);
if (ib_umem_odp_num_pages(umem_odp)) {
umem_odp->page_list =
vzalloc(array_size(sizeof(*umem_odp->page_list),
ib_umem_odp_num_pages(umem_odp)));
if (!umem_odp->page_list)
return -ENOMEM;
umem_odp->dma_list =
vzalloc(array_size(sizeof(*umem_odp->dma_list),
ib_umem_odp_num_pages(umem_odp)));
if (!umem_odp->dma_list) {
ret_val = -ENOMEM;
goto out_page_list;
}
}
ret_val = get_per_mm(umem_odp);
if (ret_val)
goto out_dma_list;
add_umem_to_per_mm(umem_odp);
return 0;
out_dma_list:
vfree(umem_odp->dma_list);
out_page_list:
vfree(umem_odp->page_list);
return ret_val;
err_free:
kfree(umem_odp);
return ERR_PTR(ret);
}
EXPORT_SYMBOL(ib_umem_odp_get);
void ib_umem_odp_release(struct ib_umem_odp *umem_odp)
{
struct ib_ucontext_per_mm *per_mm = umem_odp->per_mm;
/*
* Ensure that no more pages are mapped in the umem.
*
* It is the driver's responsibility to ensure, before calling us,
* that the hardware will not attempt to access the MR any more.
*/
ib_umem_odp_unmap_dma_pages(umem_odp, ib_umem_start(umem_odp),
ib_umem_end(umem_odp));
if (!umem_odp->is_implicit_odp) {
ib_umem_odp_unmap_dma_pages(umem_odp, ib_umem_start(umem_odp),
ib_umem_end(umem_odp));
kvfree(umem_odp->dma_list);
kvfree(umem_odp->page_list);
}
remove_umem_from_per_mm(umem_odp);
put_per_mm(umem_odp);
vfree(umem_odp->dma_list);
vfree(umem_odp->page_list);
down_write(&per_mm->umem_rwsem);
if (!umem_odp->is_implicit_odp) {
interval_tree_remove(&umem_odp->interval_tree,
&per_mm->umem_tree);
complete_all(&umem_odp->notifier_completion);
}
/*
* NOTE! mmu_notifier_unregister() can happen between a start/end
* callback, resulting in a missing end, and thus an unbalanced
* lock. This doesn't really matter to us since we are about to kfree
* the memory that holds the lock, however LOCKDEP doesn't like this.
* Thus we call the mmu_notifier_put under the rwsem and test the
* internal users count to reliably see if we are past this point.
*/
mmu_notifier_put(&per_mm->mn);
up_write(&per_mm->umem_rwsem);
mmdrop(umem_odp->umem.owning_mm);
kfree(umem_odp);
}
EXPORT_SYMBOL(ib_umem_odp_release);
/*
* Map for DMA and insert a single page into the on-demand paging page tables.
@ -493,8 +504,7 @@ static int ib_umem_odp_map_dma_single_page(
u64 access_mask,
unsigned long current_seq)
{
struct ib_ucontext *context = umem_odp->umem.context;
struct ib_device *dev = context->device;
struct ib_device *dev = umem_odp->umem.ibdev;
dma_addr_t dma_addr;
int remove_existing_mapping = 0;
int ret = 0;
@ -534,7 +544,7 @@ out:
if (remove_existing_mapping) {
ib_umem_notifier_start_account(umem_odp);
context->invalidate_range(
dev->ops.invalidate_range(
umem_odp,
ib_umem_start(umem_odp) +
(page_index << umem_odp->page_shift),
@ -707,7 +717,7 @@ void ib_umem_odp_unmap_dma_pages(struct ib_umem_odp *umem_odp, u64 virt,
{
int idx;
u64 addr;
struct ib_device *dev = umem_odp->umem.context->device;
struct ib_device *dev = umem_odp->umem.ibdev;
virt = max_t(u64, virt, ib_umem_start(umem_odp));
bound = min_t(u64, bound, ib_umem_end(umem_odp));
@ -761,35 +771,21 @@ int rbt_ib_umem_for_each_in_range(struct rb_root_cached *root,
void *cookie)
{
int ret_val = 0;
struct umem_odp_node *node, *next;
struct interval_tree_node *node, *next;
struct ib_umem_odp *umem;
if (unlikely(start == last))
return ret_val;
for (node = rbt_ib_umem_iter_first(root, start, last - 1);
for (node = interval_tree_iter_first(root, start, last - 1);
node; node = next) {
/* TODO move the blockable decision up to the callback */
if (!blockable)
return -EAGAIN;
next = rbt_ib_umem_iter_next(node, start, last - 1);
next = interval_tree_iter_next(node, start, last - 1);
umem = container_of(node, struct ib_umem_odp, interval_tree);
ret_val = cb(umem, start, last, cookie) || ret_val;
}
return ret_val;
}
EXPORT_SYMBOL(rbt_ib_umem_for_each_in_range);
struct ib_umem_odp *rbt_ib_umem_lookup(struct rb_root_cached *root,
u64 addr, u64 length)
{
struct umem_odp_node *node;
node = rbt_ib_umem_iter_first(root, addr, addr + length - 1);
if (node)
return container_of(node, struct ib_umem_odp, interval_tree);
return NULL;
}
EXPORT_SYMBOL(rbt_ib_umem_lookup);

5
drivers/infiniband/core/uverbs_cmd.c
View File

@ -252,9 +252,6 @@ static int ib_uverbs_get_context(struct uverbs_attr_bundle *attrs)
ucontext->closing = false;
ucontext->cleanup_retryable = false;
mutex_init(&ucontext->per_mm_list_lock);
INIT_LIST_HEAD(&ucontext->per_mm_list);
ret = get_unused_fd_flags(O_CLOEXEC);
if (ret < 0)
goto err_free;
@ -275,8 +272,6 @@ static int ib_uverbs_get_context(struct uverbs_attr_bundle *attrs)
ret = ib_dev->ops.alloc_ucontext(ucontext, &attrs->driver_udata);
if (ret)
goto err_file;
if (!(ib_dev->attrs.device_cap_flags & IB_DEVICE_ON_DEMAND_PAGING))
ucontext->invalidate_range = NULL;
rdma_restrack_uadd(&ucontext->res);

1
drivers/infiniband/core/uverbs_main.c
View File

@ -1487,6 +1487,7 @@ static void __exit ib_uverbs_cleanup(void)
IB_UVERBS_NUM_FIXED_MINOR);
unregister_chrdev_region(dynamic_uverbs_dev,
IB_UVERBS_NUM_DYNAMIC_MINOR);
mmu_notifier_synchronize();
}
module_init(ib_uverbs_init);

9
drivers/infiniband/hw/mlx5/main.c
View File

@ -1867,10 +1867,6 @@ static int mlx5_ib_alloc_ucontext(struct ib_ucontext *uctx,
if (err)
goto out_sys_pages;
if (ibdev->attrs.device_cap_flags & IB_DEVICE_ON_DEMAND_PAGING)
context->ibucontext.invalidate_range =
&mlx5_ib_invalidate_range;
if (req.flags & MLX5_IB_ALLOC_UCTX_DEVX) {
err = mlx5_ib_devx_create(dev, true);
if (err < 0)
@ -1999,11 +1995,6 @@ static void mlx5_ib_dealloc_ucontext(struct ib_ucontext *ibcontext)
struct mlx5_ib_dev *dev = to_mdev(ibcontext->device);
struct mlx5_bfreg_info *bfregi;
/* All umem's must be destroyed before destroying the ucontext. */
mutex_lock(&ibcontext->per_mm_list_lock);
WARN_ON(!list_empty(&ibcontext->per_mm_list));
mutex_unlock(&ibcontext->per_mm_list_lock);
bfregi = &context->bfregi;
mlx5_ib_dealloc_transport_domain(dev, context->tdn, context->devx_uid);

13
drivers/infiniband/hw/mlx5/mem.c
View File

@ -56,19 +56,6 @@ void mlx5_ib_cont_pages(struct ib_umem *umem, u64 addr,
struct scatterlist *sg;
int entry;
if (umem->is_odp) {
struct ib_umem_odp *odp = to_ib_umem_odp(umem);
unsigned int page_shift = odp->page_shift;
*ncont = ib_umem_odp_num_pages(odp);
*count = *ncont << (page_shift - PAGE_SHIFT);
*shift = page_shift;
if (order)
*order = ilog2(roundup_pow_of_two(*ncont));
return;
}
addr = addr >> PAGE_SHIFT;
tmp = (unsigned long)addr;
m = find_first_bit(&tmp, BITS_PER_LONG);

38
drivers/infiniband/hw/mlx5/mr.c
View File

@ -784,19 +784,37 @@ static int mr_umem_get(struct mlx5_ib_dev *dev, struct ib_udata *udata,
int *ncont, int *order)
{
struct ib_umem *u;
int err;
*umem = NULL;
u = ib_umem_get(udata, start, length, access_flags, 0);
err = PTR_ERR_OR_ZERO(u);
if (err) {
mlx5_ib_dbg(dev, "umem get failed (%d)\n", err);
return err;
if (access_flags & IB_ACCESS_ON_DEMAND) {
struct ib_umem_odp *odp;
odp = ib_umem_odp_get(udata, start, length, access_flags);
if (IS_ERR(odp)) {
mlx5_ib_dbg(dev, "umem get failed (%ld)\n",
PTR_ERR(odp));
return PTR_ERR(odp);
}
u = &odp->umem;
*page_shift = odp->page_shift;
*ncont = ib_umem_odp_num_pages(odp);
*npages = *ncont << (*page_shift - PAGE_SHIFT);
if (order)
*order = ilog2(roundup_pow_of_two(*ncont));
} else {
u = ib_umem_get(udata, start, length, access_flags, 0);
if (IS_ERR(u)) {
mlx5_ib_dbg(dev, "umem get failed (%ld)\n", PTR_ERR(u));
return PTR_ERR(u);
}
mlx5_ib_cont_pages(u, start, MLX5_MKEY_PAGE_SHIFT_MASK, npages,
page_shift, ncont, order);
}
mlx5_ib_cont_pages(u, start, MLX5_MKEY_PAGE_SHIFT_MASK, npages,
page_shift, ncont, order);
if (!*npages) {
mlx5_ib_warn(dev, "avoid zero region\n");
ib_umem_release(u);
@ -1599,7 +1617,7 @@ static void dereg_mr(struct mlx5_ib_dev *dev, struct mlx5_ib_mr *mr)
/* Wait for all running page-fault handlers to finish. */
synchronize_srcu(&dev->mr_srcu);
/* Destroy all page mappings */
if (umem_odp->page_list)
if (!umem_odp->is_implicit_odp)
mlx5_ib_invalidate_range(umem_odp,
ib_umem_start(umem_odp),
ib_umem_end(umem_odp));
@ -1610,7 +1628,7 @@ static void dereg_mr(struct mlx5_ib_dev *dev, struct mlx5_ib_mr *mr)
* so that there will not be any invalidations in
* flight, looking at the *mr struct.
*/
ib_umem_release(umem);
ib_umem_odp_release(umem_odp);
atomic_sub(npages, &dev->mdev->priv.reg_pages);
/* Avoid double-freeing the umem. */

90
drivers/infiniband/hw/mlx5/odp.c
View File

@ -184,7 +184,7 @@ void mlx5_odp_populate_klm(struct mlx5_klm *pklm, size_t offset,
for (i = 0; i < nentries; i++, pklm++) {
pklm->bcount = cpu_to_be32(MLX5_IMR_MTT_SIZE);
va = (offset + i) * MLX5_IMR_MTT_SIZE;
if (odp && odp->umem.address == va) {
if (odp && ib_umem_start(odp) == va) {
struct mlx5_ib_mr *mtt = odp->private;
pklm->key = cpu_to_be32(mtt->ibmr.lkey);
@ -206,7 +206,7 @@ static void mr_leaf_free_action(struct work_struct *work)
mr->parent = NULL;
synchronize_srcu(&mr->dev->mr_srcu);
ib_umem_release(&odp->umem);
ib_umem_odp_release(odp);
if (imr->live)
mlx5_ib_update_xlt(imr, idx, 1, 0,
MLX5_IB_UPD_XLT_INDIRECT |
@ -386,7 +386,7 @@ static void mlx5_ib_page_fault_resume(struct mlx5_ib_dev *dev,
}
static struct mlx5_ib_mr *implicit_mr_alloc(struct ib_pd *pd,
struct ib_umem *umem,
struct ib_umem_odp *umem_odp,
bool ksm, int access_flags)
{
struct mlx5_ib_dev *dev = to_mdev(pd->device);
@ -404,7 +404,7 @@ static struct mlx5_ib_mr *implicit_mr_alloc(struct ib_pd *pd,
mr->dev = dev;
mr->access_flags = access_flags;
mr->mmkey.iova = 0;
mr->umem = umem;
mr->umem = &umem_odp->umem;
if (ksm) {
err = mlx5_ib_update_xlt(mr, 0,
@ -464,18 +464,17 @@ next_mr:
if (nentries)
nentries++;
} else {
odp = ib_alloc_odp_umem(odp_mr, addr,
MLX5_IMR_MTT_SIZE);
odp = ib_umem_odp_alloc_child(odp_mr, addr, MLX5_IMR_MTT_SIZE);
if (IS_ERR(odp)) {
mutex_unlock(&odp_mr->umem_mutex);
return ERR_CAST(odp);
}
mtt = implicit_mr_alloc(mr->ibmr.pd, &odp->umem, 0,
mtt = implicit_mr_alloc(mr->ibmr.pd, odp, 0,
mr->access_flags);
if (IS_ERR(mtt)) {
mutex_unlock(&odp_mr->umem_mutex);
ib_umem_release(&odp->umem);
ib_umem_odp_release(odp);
return ERR_CAST(mtt);
}
@ -497,7 +496,7 @@ next_mr:
addr += MLX5_IMR_MTT_SIZE;
if (unlikely(addr < io_virt + bcnt)) {
odp = odp_next(odp);
if (odp && odp->umem.address != addr)
if (odp && ib_umem_start(odp) != addr)
odp = NULL;
goto next_mr;
}
@ -521,19 +520,19 @@ struct mlx5_ib_mr *mlx5_ib_alloc_implicit_mr(struct mlx5_ib_pd *pd,
int access_flags)
{
struct mlx5_ib_mr *imr;
struct ib_umem *umem;
struct ib_umem_odp *umem_odp;
umem = ib_umem_get(udata, 0, 0, access_flags, 0);
if (IS_ERR(umem))
return ERR_CAST(umem);
umem_odp = ib_umem_odp_alloc_implicit(udata, access_flags);
if (IS_ERR(umem_odp))
return ERR_CAST(umem_odp);
imr = implicit_mr_alloc(&pd->ibpd, umem, 1, access_flags);
imr = implicit_mr_alloc(&pd->ibpd, umem_odp, 1, access_flags);
if (IS_ERR(imr)) {
ib_umem_release(umem);
ib_umem_odp_release(umem_odp);
return ERR_CAST(imr);
}
imr->umem = umem;
imr->umem = &umem_odp->umem;
init_waitqueue_head(&imr->q_leaf_free);
atomic_set(&imr->num_leaf_free, 0);
atomic_set(&imr->num_pending_prefetch, 0);
@ -541,34 +540,31 @@ struct mlx5_ib_mr *mlx5_ib_alloc_implicit_mr(struct mlx5_ib_pd *pd,
return imr;
}
static int mr_leaf_free(struct ib_umem_odp *umem_odp, u64 start, u64 end,
void *cookie)
{
struct mlx5_ib_mr *mr = umem_odp->private, *imr = cookie;
if (mr->parent != imr)
return 0;
ib_umem_odp_unmap_dma_pages(umem_odp, ib_umem_start(umem_odp),
ib_umem_end(umem_odp));
if (umem_odp->dying)
return 0;
WRITE_ONCE(umem_odp->dying, 1);
atomic_inc(&imr->num_leaf_free);
schedule_work(&umem_odp->work);
return 0;
}
void mlx5_ib_free_implicit_mr(struct mlx5_ib_mr *imr)
{
struct ib_ucontext_per_mm *per_mm = mr_to_per_mm(imr);
struct rb_node *node;
down_read(&per_mm->umem_rwsem);
rbt_ib_umem_for_each_in_range(&per_mm->umem_tree, 0, ULLONG_MAX,
mr_leaf_free, true, imr);
for (node = rb_first_cached(&per_mm->umem_tree); node;
node = rb_next(node)) {
struct ib_umem_odp *umem_odp =
rb_entry(node, struct ib_umem_odp, interval_tree.rb);
struct mlx5_ib_mr *mr = umem_odp->private;
if (mr->parent != imr)
continue;
ib_umem_odp_unmap_dma_pages(umem_odp, ib_umem_start(umem_odp),
ib_umem_end(umem_odp));
if (umem_odp->dying)
continue;
WRITE_ONCE(umem_odp->dying, 1);
atomic_inc(&imr->num_leaf_free);
schedule_work(&umem_odp->work);
}
up_read(&per_mm->umem_rwsem);
wait_event(imr->q_leaf_free, !atomic_read(&imr->num_leaf_free));
@ -589,7 +585,7 @@ static int pagefault_mr(struct mlx5_ib_dev *dev, struct mlx5_ib_mr *mr,
struct ib_umem_odp *odp;
size_t size;
if (!odp_mr->page_list) {
if (odp_mr->is_implicit_odp) {
odp = implicit_mr_get_data(mr, io_virt, bcnt);
if (IS_ERR(odp))
@ -607,7 +603,7 @@ next_mr:
start_idx = (io_virt - (mr->mmkey.iova & page_mask)) >> page_shift;
access_mask = ODP_READ_ALLOWED_BIT;
if (prefetch && !downgrade && !mr->umem->writable) {
if (prefetch && !downgrade && !odp->umem.writable) {
/* prefetch with write-access must
* be supported by the MR
*/
@ -615,7 +611,7 @@ next_mr:
goto out;
}
if (mr->umem->writable && !downgrade)
if (odp->umem.writable && !downgrade)
access_mask |= ODP_WRITE_ALLOWED_BIT;
current_seq = READ_ONCE(odp->notifiers_seq);
@ -625,8 +621,8 @@ next_mr:
*/
smp_rmb();
ret = ib_umem_odp_map_dma_pages(to_ib_umem_odp(mr->umem), io_virt, size,
access_mask, current_seq);
ret = ib_umem_odp_map_dma_pages(odp, io_virt, size, access_mask,
current_seq);
if (ret < 0)
goto out;
@ -634,8 +630,7 @@ next_mr:
np = ret;
mutex_lock(&odp->umem_mutex);
if (!ib_umem_mmu_notifier_retry(to_ib_umem_odp(mr->umem),
current_seq)) {
if (!ib_umem_mmu_notifier_retry(odp, current_seq)) {
/*
* No need to check whether the MTTs really belong to
* this MR, since ib_umem_odp_map_dma_pages already
@ -668,7 +663,7 @@ next_mr:
io_virt += size;
next = odp_next(odp);
if (unlikely(!next || next->umem.address != io_virt)) {
if (unlikely(!next || ib_umem_start(next) != io_virt)) {
mlx5_ib_dbg(dev, "next implicit leaf removed at 0x%llx. got %p\n",
io_virt, next);
return -EAGAIN;
@ -1618,6 +1613,7 @@ void mlx5_odp_init_mr_cache_entry(struct mlx5_cache_ent *ent)
static const struct ib_device_ops mlx5_ib_dev_odp_ops = {
.advise_mr = mlx5_ib_advise_mr,
.invalidate_range = mlx5_ib_invalidate_range,
};
int mlx5_ib_odp_init_one(struct mlx5_ib_dev *dev)

1
drivers/misc/sgi-gru/grufile.c
View File

@ -573,6 +573,7 @@ static void __exit gru_exit(void)
gru_free_tables();
misc_deregister(&gru_miscdev);
gru_proc_exit();
mmu_notifier_synchronize();
}
static const struct file_operations gru_fops = {

2
drivers/misc/sgi-gru/grutables.h
View File

@ -307,10 +307,8 @@ struct gru_mm_tracker { /* pack to reduce size */
struct gru_mm_struct {
struct mmu_notifier ms_notifier;
atomic_t ms_refcnt;
spinlock_t ms_asid_lock; /* protects ASID assignment */
atomic_t ms_range_active;/* num range_invals active */
char ms_released;
wait_queue_head_t ms_wait_queue;
DECLARE_BITMAP(ms_asidmap, GRU_MAX_GRUS);
struct gru_mm_tracker ms_asids[GRU_MAX_GRUS];

82
drivers/misc/sgi-gru/grutlbpurge.c
View File

@ -235,83 +235,47 @@ static void gru_invalidate_range_end(struct mmu_notifier *mn,
gms, range->start, range->end);
}
static void gru_release(struct mmu_notifier *mn, struct mm_struct *mm)
static struct mmu_notifier *gru_alloc_notifier(struct mm_struct *mm)
{
struct gru_mm_struct *gms = container_of(mn, struct gru_mm_struct,
ms_notifier);
struct gru_mm_struct *gms;
gms->ms_released = 1;
gru_dbg(grudev, "gms %p\n", gms);
gms = kzalloc(sizeof(*gms), GFP_KERNEL);
if (!gms)
return ERR_PTR(-ENOMEM);
STAT(gms_alloc);
spin_lock_init(&gms->ms_asid_lock);
init_waitqueue_head(&gms->ms_wait_queue);
return &gms->ms_notifier;
}
static void gru_free_notifier(struct mmu_notifier *mn)
{
kfree(container_of(mn, struct gru_mm_struct, ms_notifier));
STAT(gms_free);
}
static const struct mmu_notifier_ops gru_mmuops = {
.invalidate_range_start = gru_invalidate_range_start,
.invalidate_range_end = gru_invalidate_range_end,
.release = gru_release,
.alloc_notifier = gru_alloc_notifier,
.free_notifier = gru_free_notifier,
};
/* Move this to the basic mmu_notifier file. But for now... */
static struct mmu_notifier *mmu_find_ops(struct mm_struct *mm,
const struct mmu_notifier_ops *ops)
{
struct mmu_notifier *mn, *gru_mn = NULL;
if (mm->mmu_notifier_mm) {
rcu_read_lock();
hlist_for_each_entry_rcu(mn, &mm->mmu_notifier_mm->list,
hlist)
if (mn->ops == ops) {
gru_mn = mn;
break;
}
rcu_read_unlock();
}
return gru_mn;
}
struct gru_mm_struct *gru_register_mmu_notifier(void)
{
struct gru_mm_struct *gms;
struct mmu_notifier *mn;
int err;
mn = mmu_find_ops(current->mm, &gru_mmuops);
if (mn) {
gms = container_of(mn, struct gru_mm_struct, ms_notifier);
atomic_inc(&gms->ms_refcnt);
} else {
gms = kzalloc(sizeof(*gms), GFP_KERNEL);
if (!gms)
return ERR_PTR(-ENOMEM);
STAT(gms_alloc);
spin_lock_init(&gms->ms_asid_lock);
gms->ms_notifier.ops = &gru_mmuops;
atomic_set(&gms->ms_refcnt, 1);
init_waitqueue_head(&gms->ms_wait_queue);
err = __mmu_notifier_register(&gms->ms_notifier, current->mm);
if (err)
goto error;
}
if (gms)
gru_dbg(grudev, "gms %p, refcnt %d\n", gms,
atomic_read(&gms->ms_refcnt));
return gms;
error:
kfree(gms);
return ERR_PTR(err);
mn = mmu_notifier_get_locked(&gru_mmuops, current->mm);
if (IS_ERR(mn))
return ERR_CAST(mn);
return container_of(mn, struct gru_mm_struct, ms_notifier);
}
void gru_drop_mmu_notifier(struct gru_mm_struct *gms)
{
gru_dbg(grudev, "gms %p, refcnt %d, released %d\n", gms,
atomic_read(&gms->ms_refcnt), gms->ms_released);
if (atomic_dec_return(&gms->ms_refcnt) == 0) {
if (!gms->ms_released)
mmu_notifier_unregister(&gms->ms_notifier, current->mm);
kfree(gms);
STAT(gms_free);
}
mmu_notifier_put(&gms->ms_notifier);
}
/*

12
drivers/nvdimm/Kconfig
View File

@ -118,4 +118,16 @@ config NVDIMM_KEYS
depends on ENCRYPTED_KEYS
depends on (LIBNVDIMM=ENCRYPTED_KEYS) || LIBNVDIMM=m
config NVDIMM_TEST_BUILD
tristate "Build the unit test core"
depends on m
depends on COMPILE_TEST && X86_64
default m if COMPILE_TEST
help
Build the core of the unit test infrastructure. The result of
this build is non-functional for unit test execution, but it
otherwise helps catch build errors induced by changes to the
core devm_memremap_pages() implementation and other
infrastructure.
endif

4
drivers/nvdimm/Makefile
View File

@ -29,3 +29,7 @@ libnvdimm-$(CONFIG_BTT) += btt_devs.o
libnvdimm-$(CONFIG_NVDIMM_PFN) += pfn_devs.o
libnvdimm-$(CONFIG_NVDIMM_DAX) += dax_devs.o
libnvdimm-$(CONFIG_NVDIMM_KEYS) += security.o
TOOLS := ../../tools
TEST_SRC := $(TOOLS)/testing/nvdimm/test
obj-$(CONFIG_NVDIMM_TEST_BUILD) += $(TEST_SRC)/iomap.o

80
fs/proc/task_mmu.c
View File

@ -1,5 +1,5 @@
// SPDX-License-Identifier: GPL-2.0
#include <linux/mm.h>
#include <linux/pagewalk.h>
#include <linux/vmacache.h>
#include <linux/hugetlb.h>
#include <linux/huge_mm.h>
@ -513,7 +513,9 @@ static int smaps_pte_hole(unsigned long addr, unsigned long end,
return 0;
}
#endif
#else
#define smaps_pte_hole NULL
#endif /* CONFIG_SHMEM */
static void smaps_pte_entry(pte_t *pte, unsigned long addr,
struct mm_walk *walk)
@ -729,21 +731,24 @@ static int smaps_hugetlb_range(pte_t *pte, unsigned long hmask,
}
return 0;
}
#else
#define smaps_hugetlb_range NULL
#endif /* HUGETLB_PAGE */
static const struct mm_walk_ops smaps_walk_ops = {
.pmd_entry = smaps_pte_range,
.hugetlb_entry = smaps_hugetlb_range,
};
static const struct mm_walk_ops smaps_shmem_walk_ops = {
.pmd_entry = smaps_pte_range,
.hugetlb_entry = smaps_hugetlb_range,
.pte_hole = smaps_pte_hole,
};
static void smap_gather_stats(struct vm_area_struct *vma,
struct mem_size_stats *mss)
{
struct mm_walk smaps_walk = {
.pmd_entry = smaps_pte_range,
#ifdef CONFIG_HUGETLB_PAGE
.hugetlb_entry = smaps_hugetlb_range,
#endif
.mm = vma->vm_mm,
};
smaps_walk.private = mss;
#ifdef CONFIG_SHMEM
/* In case of smaps_rollup, reset the value from previous vma */
mss->check_shmem_swap = false;
@ -765,12 +770,13 @@ static void smap_gather_stats(struct vm_area_struct *vma,
mss->swap += shmem_swapped;
} else {
mss->check_shmem_swap = true;
smaps_walk.pte_hole = smaps_pte_hole;
walk_page_vma(vma, &smaps_shmem_walk_ops, mss);
return;
}
}
#endif
/* mmap_sem is held in m_start */
walk_page_vma(vma, &smaps_walk);
walk_page_vma(vma, &smaps_walk_ops, mss);
}
#define SEQ_PUT_DEC(str, val) \
@ -1118,6 +1124,11 @@ static int clear_refs_test_walk(unsigned long start, unsigned long end,
return 0;
}
static const struct mm_walk_ops clear_refs_walk_ops = {
.pmd_entry = clear_refs_pte_range,
.test_walk = clear_refs_test_walk,
};
static ssize_t clear_refs_write(struct file *file, const char __user *buf,
size_t count, loff_t *ppos)
{
@ -1151,12 +1162,6 @@ static ssize_t clear_refs_write(struct file *file, const char __user *buf,
struct clear_refs_private cp = {
.type = type,
};
struct mm_walk clear_refs_walk = {
.pmd_entry = clear_refs_pte_range,
.test_walk = clear_refs_test_walk,
.mm = mm,
.private = &cp,
};
if (type == CLEAR_REFS_MM_HIWATER_RSS) {
if (down_write_killable(&mm->mmap_sem)) {
@ -1217,7 +1222,8 @@ static ssize_t clear_refs_write(struct file *file, const char __user *buf,
0, NULL, mm, 0, -1UL);
mmu_notifier_invalidate_range_start(&range);
}
walk_page_range(0, mm->highest_vm_end, &clear_refs_walk);
walk_page_range(mm, 0, mm->highest_vm_end, &clear_refs_walk_ops,
&cp);
if (type == CLEAR_REFS_SOFT_DIRTY)
mmu_notifier_invalidate_range_end(&range);
tlb_finish_mmu(&tlb, 0, -1);
@ -1489,8 +1495,16 @@ static int pagemap_hugetlb_range(pte_t *ptep, unsigned long hmask,
return err;
}
#else
#define pagemap_hugetlb_range NULL
#endif /* HUGETLB_PAGE */
static const struct mm_walk_ops pagemap_ops = {
.pmd_entry = pagemap_pmd_range,
.pte_hole = pagemap_pte_hole,
.hugetlb_entry = pagemap_hugetlb_range,
};
/*
* /proc/pid/pagemap - an array mapping virtual pages to pfns
*
@ -1522,7 +1536,6 @@ static ssize_t pagemap_read(struct file *file, char __user *buf,
{
struct mm_struct *mm = file->private_data;
struct pagemapread pm;
struct mm_walk pagemap_walk = {};
unsigned long src;
unsigned long svpfn;
unsigned long start_vaddr;
@ -1550,14 +1563,6 @@ static ssize_t pagemap_read(struct file *file, char __user *buf,
if (!pm.buffer)
goto out_mm;
pagemap_walk.pmd_entry = pagemap_pmd_range;
pagemap_walk.pte_hole = pagemap_pte_hole;
#ifdef CONFIG_HUGETLB_PAGE
pagemap_walk.hugetlb_entry = pagemap_hugetlb_range;
#endif
pagemap_walk.mm = mm;
pagemap_walk.private = &pm;
src = *ppos;
svpfn = src / PM_ENTRY_BYTES;
start_vaddr = svpfn << PAGE_SHIFT;
@ -1586,7 +1591,7 @@ static ssize_t pagemap_read(struct file *file, char __user *buf,
ret = down_read_killable(&mm->mmap_sem);
if (ret)
goto out_free;
ret = walk_page_range(start_vaddr, end, &pagemap_walk);
ret = walk_page_range(mm, start_vaddr, end, &pagemap_ops, &pm);
up_read(&mm->mmap_sem);
start_vaddr = end;
@ -1798,6 +1803,11 @@ static int gather_hugetlb_stats(pte_t *pte, unsigned long hmask,
}
#endif
static const struct mm_walk_ops show_numa_ops = {
.hugetlb_entry = gather_hugetlb_stats,
.pmd_entry = gather_pte_stats,
};
/*
* Display pages allocated per node and memory policy via /proc.
*/
@ -1809,12 +1819,6 @@ static int show_numa_map(struct seq_file *m, void *v)
struct numa_maps *md = &numa_priv->md;
struct file *file = vma->vm_file;
struct mm_struct *mm = vma->vm_mm;
struct mm_walk walk = {
.hugetlb_entry = gather_hugetlb_stats,
.pmd_entry = gather_pte_stats,
.private = md,
.mm = mm,
};
struct mempolicy *pol;
char buffer[64];
int nid;
@ -1848,7 +1852,7 @@ static int show_numa_map(struct seq_file *m, void *v)
seq_puts(m, " huge");
/* mmap_sem is held by m_start */
walk_page_vma(vma, &walk);
walk_page_vma(vma, &show_numa_ops, md);
if (!md->pages)
goto out;

125
include/linux/hmm.h
View File

@ -84,15 +84,12 @@
* @notifiers: count of active mmu notifiers
*/
struct hmm {
struct mm_struct *mm;
struct kref kref;
struct mmu_notifier mmu_notifier;
spinlock_t ranges_lock;
struct list_head ranges;
struct list_head mirrors;
struct mmu_notifier mmu_notifier;
struct rw_semaphore mirrors_sem;
wait_queue_head_t wq;
struct rcu_head rcu;
long notifiers;
};
@ -158,13 +155,11 @@ enum hmm_pfn_value_e {
* @values: pfn value for some special case (none, special, error, ...)
* @default_flags: default flags for the range (write, read, ... see hmm doc)
* @pfn_flags_mask: allows to mask pfn flags so that only default_flags matter
* @page_shift: device virtual address shift value (should be >= PAGE_SHIFT)
* @pfn_shifts: pfn shift value (should be <= PAGE_SHIFT)
* @valid: pfns array did not change since it has been fill by an HMM function
*/
struct hmm_range {
struct hmm *hmm;
struct vm_area_struct *vma;
struct list_head list;
unsigned long start;
unsigned long end;
@ -173,31 +168,10 @@ struct hmm_range {
const uint64_t *values;
uint64_t default_flags;
uint64_t pfn_flags_mask;
uint8_t page_shift;
uint8_t pfn_shift;
bool valid;
};
/*
* hmm_range_page_shift() - return the page shift for the range
* @range: range being queried
* Return: page shift (page size = 1 << page shift) for the range
*/
static inline unsigned hmm_range_page_shift(const struct hmm_range *range)
{
return range->page_shift;
}
/*
* hmm_range_page_size() - return the page size for the range
* @range: range being queried
* Return: page size for the range in bytes
*/
static inline unsigned long hmm_range_page_size(const struct hmm_range *range)
{
return 1UL << hmm_range_page_shift(range);
}
/*
* hmm_range_wait_until_valid() - wait for range to be valid
* @range: range affected by invalidation to wait on
@ -290,40 +264,6 @@ static inline uint64_t hmm_device_entry_from_pfn(const struct hmm_range *range,
range->flags[HMM_PFN_VALID];
}
/*
* Old API:
* hmm_pfn_to_page()
* hmm_pfn_to_pfn()
* hmm_pfn_from_page()
* hmm_pfn_from_pfn()
*
* This are the OLD API please use new API, it is here to avoid cross-tree
* merge painfullness ie we convert things to new API in stages.
*/
static inline struct page *hmm_pfn_to_page(const struct hmm_range *range,
uint64_t pfn)
{
return hmm_device_entry_to_page(range, pfn);
}
static inline unsigned long hmm_pfn_to_pfn(const struct hmm_range *range,
uint64_t pfn)
{
return hmm_device_entry_to_pfn(range, pfn);
}
static inline uint64_t hmm_pfn_from_page(const struct hmm_range *range,
struct page *page)
{
return hmm_device_entry_from_page(range, page);
}
static inline uint64_t hmm_pfn_from_pfn(const struct hmm_range *range,
unsigned long pfn)
{
return hmm_device_entry_from_pfn(range, pfn);
}
/*
* Mirroring: how to synchronize device page table with CPU page table.
*
@ -374,29 +314,6 @@ static inline uint64_t hmm_pfn_from_pfn(const struct hmm_range *range,
struct hmm_mirror;
/*
* enum hmm_update_event - type of update
* @HMM_UPDATE_INVALIDATE: invalidate range (no indication as to why)
*/
enum hmm_update_event {
HMM_UPDATE_INVALIDATE,
};
/*
* struct hmm_update - HMM update information for callback
*
* @start: virtual start address of the range to update
* @end: virtual end address of the range to update
* @event: event triggering the update (what is happening)
* @blockable: can the callback block/sleep ?
*/
struct hmm_update {
unsigned long start;
unsigned long end;
enum hmm_update_event event;
bool blockable;
};
/*
* struct hmm_mirror_ops - HMM mirror device operations callback
*
@ -417,9 +334,9 @@ struct hmm_mirror_ops {
/* sync_cpu_device_pagetables() - synchronize page tables
*
* @mirror: pointer to struct hmm_mirror
* @update: update information (see struct hmm_update)
* Return: -EAGAIN if update.blockable false and callback need to
* block, 0 otherwise.
* @update: update information (see struct mmu_notifier_range)
* Return: -EAGAIN if mmu_notifier_range_blockable(update) is false
* and callback needs to block, 0 otherwise.
*
* This callback ultimately originates from mmu_notifiers when the CPU
* page table is updated. The device driver must update its page table
@ -430,8 +347,9 @@ struct hmm_mirror_ops {
* page tables are completely updated (TLBs flushed, etc); this is a
* synchronous call.
*/
int (*sync_cpu_device_pagetables)(struct hmm_mirror *mirror,
const struct hmm_update *update);
int (*sync_cpu_device_pagetables)(
struct hmm_mirror *mirror,
const struct mmu_notifier_range *update);
};
/*
@ -457,20 +375,24 @@ void hmm_mirror_unregister(struct hmm_mirror *mirror);
/*
* Please see Documentation/vm/hmm.rst for how to use the range API.
*/
int hmm_range_register(struct hmm_range *range,
struct hmm_mirror *mirror,
unsigned long start,
unsigned long end,
unsigned page_shift);
int hmm_range_register(struct hmm_range *range, struct hmm_mirror *mirror);
void hmm_range_unregister(struct hmm_range *range);
long hmm_range_snapshot(struct hmm_range *range);
long hmm_range_fault(struct hmm_range *range, bool block);
/*
* Retry fault if non-blocking, drop mmap_sem and return -EAGAIN in that case.
*/
#define HMM_FAULT_ALLOW_RETRY (1 << 0)
/* Don't fault in missing PTEs, just snapshot the current state. */
#define HMM_FAULT_SNAPSHOT (1 << 1)
long hmm_range_fault(struct hmm_range *range, unsigned int flags);
long hmm_range_dma_map(struct hmm_range *range,
struct device *device,
dma_addr_t *daddrs,
bool block);
unsigned int flags);
long hmm_range_dma_unmap(struct hmm_range *range,
struct vm_area_struct *vma,
struct device *device,
dma_addr_t *daddrs,
bool dirty);
@ -484,13 +406,6 @@ long hmm_range_dma_unmap(struct hmm_range *range,
*/
#define HMM_RANGE_DEFAULT_TIMEOUT 1000
/* Below are for HMM internal use only! Not to be used by device driver! */
static inline void hmm_mm_init(struct mm_struct *mm)
{
mm->hmm = NULL;
}
#else /* IS_ENABLED(CONFIG_HMM_MIRROR) */
static inline void hmm_mm_init(struct mm_struct *mm) {}
#endif /* IS_ENABLED(CONFIG_HMM_MIRROR) */
#endif /* LINUX_HMM_H */

2
include/linux/ioport.h
View File

@ -297,6 +297,8 @@ static inline bool resource_overlaps(struct resource *r1, struct resource *r2)
struct resource *devm_request_free_mem_region(struct device *dev,
struct resource *base, unsigned long size);
struct resource *request_free_mem_region(struct resource *base,
unsigned long size, const char *name);
#endif /* __ASSEMBLY__ */
#endif /* _LINUX_IOPORT_H */

23
include/linux/kernel.h
View File

@ -217,7 +217,9 @@ extern void __cant_sleep(const char *file, int line, int preempt_offset);
* might_sleep - annotation for functions that can sleep
*
* this macro will print a stack trace if it is executed in an atomic
* context (spinlock, irq-handler, ...).
* context (spinlock, irq-handler, ...). Additional sections where blocking is
* not allowed can be annotated with non_block_start() and non_block_end()
* pairs.
*
* This is a useful debugging help to be able to catch problems early and not
* be bitten later when the calling function happens to sleep when it is not
@ -233,6 +235,23 @@ extern void __cant_sleep(const char *file, int line, int preempt_offset);
# define cant_sleep() \
do { __cant_sleep(__FILE__, __LINE__, 0); } while (0)
# define sched_annotate_sleep() (current->task_state_change = 0)
/**
* non_block_start - annotate the start of section where sleeping is prohibited
*
* This is on behalf of the oom reaper, specifically when it is calling the mmu
* notifiers. The problem is that if the notifier were to block on, for example,
* mutex_lock() and if the process which holds that mutex were to perform a
* sleeping memory allocation, the oom reaper is now blocked on completion of
* that memory allocation. Other blocking calls like wait_event() pose similar
* issues.
*/
# define non_block_start() (current->non_block_count++)
/**
* non_block_end - annotate the end of section where sleeping is prohibited
*
* Closes a section opened by non_block_start().
*/
# define non_block_end() WARN_ON(current->non_block_count-- == 0)
#else
static inline void ___might_sleep(const char *file, int line,
int preempt_offset) { }
@ -241,6 +260,8 @@ extern void __cant_sleep(const char *file, int line, int preempt_offset);
# define might_sleep() do { might_resched(); } while (0)
# define cant_sleep() do { } while (0)
# define sched_annotate_sleep() do { } while (0)
# define non_block_start() do { } while (0)
# define non_block_end() do { } while (0)
#endif
#define might_sleep_if(cond) do { if (cond) might_sleep(); } while (0)

3
include/linux/memremap.h
View File

@ -109,7 +109,6 @@ struct dev_pagemap {
struct percpu_ref *ref;
struct percpu_ref internal_ref;
struct completion done;
struct device *dev;
enum memory_type type;
unsigned int flags;
u64 pci_p2pdma_bus_offset;
@ -124,6 +123,8 @@ static inline struct vmem_altmap *pgmap_altmap(struct dev_pagemap *pgmap)
}
#ifdef CONFIG_ZONE_DEVICE
void *memremap_pages(struct dev_pagemap *pgmap, int nid);
void memunmap_pages(struct dev_pagemap *pgmap);
void *devm_memremap_pages(struct device *dev, struct dev_pagemap *pgmap);
void devm_memunmap_pages(struct device *dev, struct dev_pagemap *pgmap);
struct dev_pagemap *get_dev_pagemap(unsigned long pfn,

120
include/linux/migrate.h
View File

@ -166,8 +166,6 @@ static inline int migrate_misplaced_transhuge_page(struct mm_struct *mm,
#define MIGRATE_PFN_MIGRATE (1UL << 1)
#define MIGRATE_PFN_LOCKED (1UL << 2)
#define MIGRATE_PFN_WRITE (1UL << 3)
#define MIGRATE_PFN_DEVICE (1UL << 4)
#define MIGRATE_PFN_ERROR (1UL << 5)
#define MIGRATE_PFN_SHIFT 6
static inline struct page *migrate_pfn_to_page(unsigned long mpfn)
@ -182,107 +180,27 @@ static inline unsigned long migrate_pfn(unsigned long pfn)
return (pfn << MIGRATE_PFN_SHIFT) | MIGRATE_PFN_VALID;
}
/*
* struct migrate_vma_ops - migrate operation callback
*
* @alloc_and_copy: alloc destination memory and copy source memory to it
* @finalize_and_map: allow caller to map the successfully migrated pages
*
*
* The alloc_and_copy() callback happens once all source pages have been locked,
* unmapped and checked (checked whether pinned or not). All pages that can be
* migrated will have an entry in the src array set with the pfn value of the
* page and with the MIGRATE_PFN_VALID and MIGRATE_PFN_MIGRATE flag set (other
* flags might be set but should be ignored by the callback).
*
* The alloc_and_copy() callback can then allocate destination memory and copy
* source memory to it for all those entries (ie with MIGRATE_PFN_VALID and
* MIGRATE_PFN_MIGRATE flag set). Once these are allocated and copied, the
* callback must update each corresponding entry in the dst array with the pfn
* value of the destination page and with the MIGRATE_PFN_VALID and
* MIGRATE_PFN_LOCKED flags set (destination pages must have their struct pages
* locked, via lock_page()).
*
* At this point the alloc_and_copy() callback is done and returns.
*
* Note that the callback does not have to migrate all the pages that are
* marked with MIGRATE_PFN_MIGRATE flag in src array unless this is a migration
* from device memory to system memory (ie the MIGRATE_PFN_DEVICE flag is also
* set in the src array entry). If the device driver cannot migrate a device
* page back to system memory, then it must set the corresponding dst array
* entry to MIGRATE_PFN_ERROR. This will trigger a SIGBUS if CPU tries to
* access any of the virtual addresses originally backed by this page. Because
* a SIGBUS is such a severe result for the userspace process, the device
* driver should avoid setting MIGRATE_PFN_ERROR unless it is really in an
* unrecoverable state.
*
* For empty entry inside CPU page table (pte_none() or pmd_none() is true) we
* do set MIGRATE_PFN_MIGRATE flag inside the corresponding source array thus
* allowing device driver to allocate device memory for those unback virtual
* address. For this the device driver simply have to allocate device memory
* and properly set the destination entry like for regular migration. Note that
* this can still fails and thus inside the device driver must check if the
* migration was successful for those entry inside the finalize_and_map()
* callback just like for regular migration.
*
* THE alloc_and_copy() CALLBACK MUST NOT CHANGE ANY OF THE SRC ARRAY ENTRIES
* OR BAD THINGS WILL HAPPEN !
*
*
* The finalize_and_map() callback happens after struct page migration from
* source to destination (destination struct pages are the struct pages for the
* memory allocated by the alloc_and_copy() callback). Migration can fail, and
* thus the finalize_and_map() allows the driver to inspect which pages were
* successfully migrated, and which were not. Successfully migrated pages will
* have the MIGRATE_PFN_MIGRATE flag set for their src array entry.
*
* It is safe to update device page table from within the finalize_and_map()
* callback because both destination and source page are still locked, and the
* mmap_sem is held in read mode (hence no one can unmap the range being
* migrated).
*
* Once callback is done cleaning up things and updating its page table (if it
* chose to do so, this is not an obligation) then it returns. At this point,
* the HMM core will finish up the final steps, and the migration is complete.
*
* THE finalize_and_map() CALLBACK MUST NOT CHANGE ANY OF THE SRC OR DST ARRAY
* ENTRIES OR BAD THINGS WILL HAPPEN !
*/
struct migrate_vma_ops {
void (*alloc_and_copy)(struct vm_area_struct *vma,
const unsigned long *src,
unsigned long *dst,
unsigned long start,
unsigned long end,
void *private);
void (*finalize_and_map)(struct vm_area_struct *vma,
const unsigned long *src,
const unsigned long *dst,
unsigned long start,
unsigned long end,
void *private);
struct migrate_vma {
struct vm_area_struct *vma;
/*
* Both src and dst array must be big enough for
* (end - start) >> PAGE_SHIFT entries.
*
* The src array must not be modified by the caller after
* migrate_vma_setup(), and must not change the dst array after
* migrate_vma_pages() returns.
*/
unsigned long *dst;
unsigned long *src;
unsigned long cpages;
unsigned long npages;
unsigned long start;
unsigned long end;
};
#if defined(CONFIG_MIGRATE_VMA_HELPER)
int migrate_vma(const struct migrate_vma_ops *ops,
struct vm_area_struct *vma,
unsigned long start,
unsigned long end,
unsigned long *src,
unsigned long *dst,
void *private);
#else
static inline int migrate_vma(const struct migrate_vma_ops *ops,
struct vm_area_struct *vma,
unsigned long start,
unsigned long end,
unsigned long *src,
unsigned long *dst,
void *private)
{
return -EINVAL;
}
#endif /* IS_ENABLED(CONFIG_MIGRATE_VMA_HELPER) */
int migrate_vma_setup(struct migrate_vma *args);
void migrate_vma_pages(struct migrate_vma *migrate);
void migrate_vma_finalize(struct migrate_vma *migrate);
#endif /* CONFIG_MIGRATION */

46
include/linux/mm.h
View File

@ -1430,54 +1430,8 @@ void zap_page_range(struct vm_area_struct *vma, unsigned long address,
void unmap_vmas(struct mmu_gather *tlb, struct vm_area_struct *start_vma,
unsigned long start, unsigned long end);
/**
* mm_walk - callbacks for walk_page_range
* @pud_entry: if set, called for each non-empty PUD (2nd-level) entry
* this handler should only handle pud_trans_huge() puds.
* the pmd_entry or pte_entry callbacks will be used for
* regular PUDs.
* @pmd_entry: if set, called for each non-empty PMD (3rd-level) entry
* this handler is required to be able to handle
* pmd_trans_huge() pmds. They may simply choose to
* split_huge_page() instead of handling it explicitly.
* @pte_entry: if set, called for each non-empty PTE (4th-level) entry
* @pte_hole: if set, called for each hole at all levels
* @hugetlb_entry: if set, called for each hugetlb entry
* @test_walk: caller specific callback function to determine whether
* we walk over the current vma or not. Returning 0
* value means "do page table walk over the current vma,"
* and a negative one means "abort current page table walk
* right now." 1 means "skip the current vma."
* @mm: mm_struct representing the target process of page table walk
* @vma: vma currently walked (NULL if walking outside vmas)
* @private: private data for callbacks' usage
*
* (see the comment on walk_page_range() for more details)
*/
struct mm_walk {
int (*pud_entry)(pud_t *pud, unsigned long addr,
unsigned long next, struct mm_walk *walk);
int (*pmd_entry)(pmd_t *pmd, unsigned long addr,
unsigned long next, struct mm_walk *walk);
int (*pte_entry)(pte_t *pte, unsigned long addr,
unsigned long next, struct mm_walk *walk);
int (*pte_hole)(unsigned long addr, unsigned long next,
struct mm_walk *walk);
int (*hugetlb_entry)(pte_t *pte, unsigned long hmask,
unsigned long addr, unsigned long next,
struct mm_walk *walk);
int (*test_walk)(unsigned long addr, unsigned long next,
struct mm_walk *walk);
struct mm_struct *mm;
struct vm_area_struct *vma;
void *private;
};
struct mmu_notifier_range;
int walk_page_range(unsigned long addr, unsigned long end,
struct mm_walk *walk);
int walk_page_vma(struct vm_area_struct *vma, struct mm_walk *walk);
void free_pgd_range(struct mmu_gather *tlb, unsigned long addr,
unsigned long end, unsigned long floor, unsigned long ceiling);
int copy_page_range(struct mm_struct *dst, struct mm_struct *src,

6
include/linux/mm_types.h
View File

@ -25,7 +25,6 @@
struct address_space;
struct mem_cgroup;
struct hmm;
/*
* Each physical page in the system has a struct page associated with
@ -511,11 +510,6 @@ struct mm_struct {
atomic_long_t hugetlb_usage;
#endif
struct work_struct async_put_work;
#ifdef CONFIG_HMM_MIRROR
/* HMM needs to track a few things per mm */
struct hmm *hmm;
#endif
} __randomize_layout;
/*

59
include/linux/mmu_notifier.h
View File

@ -42,6 +42,10 @@ enum mmu_notifier_event {
#ifdef CONFIG_MMU_NOTIFIER
#ifdef CONFIG_LOCKDEP
extern struct lockdep_map __mmu_notifier_invalidate_range_start_map;
#endif
/*
* The mmu notifier_mm structure is allocated and installed in
* mm->mmu_notifier_mm inside the mm_take_all_locks() protected
@ -211,6 +215,19 @@ struct mmu_notifier_ops {
*/
void (*invalidate_range)(struct mmu_notifier *mn, struct mm_struct *mm,
unsigned long start, unsigned long end);
/*
* These callbacks are used with the get/put interface to manage the
* lifetime of the mmu_notifier memory. alloc_notifier() returns a new
* notifier for use with the mm.
*
* free_notifier() is only called after the mmu_notifier has been
* fully put, calls to any ops callback are prevented and no ops
* callbacks are currently running. It is called from a SRCU callback
* and cannot sleep.
*/
struct mmu_notifier *(*alloc_notifier)(struct mm_struct *mm);
void (*free_notifier)(struct mmu_notifier *mn);
};
/*
@ -227,6 +244,9 @@ struct mmu_notifier_ops {
struct mmu_notifier {
struct hlist_node hlist;
const struct mmu_notifier_ops *ops;
struct mm_struct *mm;
struct rcu_head rcu;
unsigned int users;
};
static inline int mm_has_notifiers(struct mm_struct *mm)
@ -234,14 +254,27 @@ static inline int mm_has_notifiers(struct mm_struct *mm)
return unlikely(mm->mmu_notifier_mm);
}
struct mmu_notifier *mmu_notifier_get_locked(const struct mmu_notifier_ops *ops,
struct mm_struct *mm);
static inline struct mmu_notifier *
mmu_notifier_get(const struct mmu_notifier_ops *ops, struct mm_struct *mm)
{
struct mmu_notifier *ret;
down_write(&mm->mmap_sem);
ret = mmu_notifier_get_locked(ops, mm);
up_write(&mm->mmap_sem);
return ret;
}
void mmu_notifier_put(struct mmu_notifier *mn);
void mmu_notifier_synchronize(void);
extern int mmu_notifier_register(struct mmu_notifier *mn,
struct mm_struct *mm);
extern int __mmu_notifier_register(struct mmu_notifier *mn,
struct mm_struct *mm);
extern void mmu_notifier_unregister(struct mmu_notifier *mn,
struct mm_struct *mm);
extern void mmu_notifier_unregister_no_release(struct mmu_notifier *mn,
struct mm_struct *mm);
extern void __mmu_notifier_mm_destroy(struct mm_struct *mm);
extern void __mmu_notifier_release(struct mm_struct *mm);
extern int __mmu_notifier_clear_flush_young(struct mm_struct *mm,
@ -310,25 +343,36 @@ static inline void mmu_notifier_change_pte(struct mm_struct *mm,
static inline void
mmu_notifier_invalidate_range_start(struct mmu_notifier_range *range)
{
might_sleep();
lock_map_acquire(&__mmu_notifier_invalidate_range_start_map);
if (mm_has_notifiers(range->mm)) {
range->flags |= MMU_NOTIFIER_RANGE_BLOCKABLE;
__mmu_notifier_invalidate_range_start(range);
}
lock_map_release(&__mmu_notifier_invalidate_range_start_map);
}
static inline int
mmu_notifier_invalidate_range_start_nonblock(struct mmu_notifier_range *range)
{
int ret = 0;
lock_map_acquire(&__mmu_notifier_invalidate_range_start_map);
if (mm_has_notifiers(range->mm)) {
range->flags &= ~MMU_NOTIFIER_RANGE_BLOCKABLE;
return __mmu_notifier_invalidate_range_start(range);
ret = __mmu_notifier_invalidate_range_start(range);
}
return 0;
lock_map_release(&__mmu_notifier_invalidate_range_start_map);
return ret;
}
static inline void
mmu_notifier_invalidate_range_end(struct mmu_notifier_range *range)
{
if (mmu_notifier_range_blockable(range))
might_sleep();
if (mm_has_notifiers(range->mm))
__mmu_notifier_invalidate_range_end(range, false);
}
@ -482,9 +526,6 @@ static inline void mmu_notifier_range_init(struct mmu_notifier_range *range,
set_pte_at(___mm, ___address, __ptep, ___pte); \
})
extern void mmu_notifier_call_srcu(struct rcu_head *rcu,
void (*func)(struct rcu_head *rcu));
#else /* CONFIG_MMU_NOTIFIER */
struct mmu_notifier_range {
@ -581,6 +622,10 @@ static inline void mmu_notifier_mm_destroy(struct mm_struct *mm)
#define pudp_huge_clear_flush_notify pudp_huge_clear_flush
#define set_pte_at_notify set_pte_at
static inline void mmu_notifier_synchronize(void)
{
}
#endif /* CONFIG_MMU_NOTIFIER */
#endif /* _LINUX_MMU_NOTIFIER_H */

66
include/linux/pagewalk.h Normal file
View File

@ -0,0 +1,66 @@
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_PAGEWALK_H
#define _LINUX_PAGEWALK_H
#include <linux/mm.h>
struct mm_walk;
/**
* mm_walk_ops - callbacks for walk_page_range
* @pud_entry: if set, called for each non-empty PUD (2nd-level) entry
* this handler should only handle pud_trans_huge() puds.
* the pmd_entry or pte_entry callbacks will be used for
* regular PUDs.
* @pmd_entry: if set, called for each non-empty PMD (3rd-level) entry
* this handler is required to be able to handle
* pmd_trans_huge() pmds. They may simply choose to
* split_huge_page() instead of handling it explicitly.
* @pte_entry: if set, called for each non-empty PTE (4th-level) entry
* @pte_hole: if set, called for each hole at all levels
* @hugetlb_entry: if set, called for each hugetlb entry
* @test_walk: caller specific callback function to determine whether
* we walk over the current vma or not. Returning 0 means
* "do page table walk over the current vma", returning
* a negative value means "abort current page table walk
* right now" and returning 1 means "skip the current vma"
*/
struct mm_walk_ops {
int (*pud_entry)(pud_t *pud, unsigned long addr,
unsigned long next, struct mm_walk *walk);
int (*pmd_entry)(pmd_t *pmd, unsigned long addr,
unsigned long next, struct mm_walk *walk);
int (*pte_entry)(pte_t *pte, unsigned long addr,
unsigned long next, struct mm_walk *walk);
int (*pte_hole)(unsigned long addr, unsigned long next,
struct mm_walk *walk);
int (*hugetlb_entry)(pte_t *pte, unsigned long hmask,
unsigned long addr, unsigned long next,
struct mm_walk *walk);
int (*test_walk)(unsigned long addr, unsigned long next,
struct mm_walk *walk);
};
/**
* mm_walk - walk_page_range data
* @ops: operation to call during the walk
* @mm: mm_struct representing the target process of page table walk
* @vma: vma currently walked (NULL if walking outside vmas)
* @private: private data for callbacks' usage
*
* (see the comment on walk_page_range() for more details)
*/
struct mm_walk {
const struct mm_walk_ops *ops;
struct mm_struct *mm;
struct vm_area_struct *vma;
void *private;
};
int walk_page_range(struct mm_struct *mm, unsigned long start,
unsigned long end, const struct mm_walk_ops *ops,
void *private);
int walk_page_vma(struct vm_area_struct *vma, const struct mm_walk_ops *ops,
void *private);
#endif /* _LINUX_PAGEWALK_H */

4
include/linux/sched.h
View File

@ -958,6 +958,10 @@ struct task_struct {
struct mutex_waiter *blocked_on;
#endif
#ifdef CONFIG_DEBUG_ATOMIC_SLEEP
int non_block_count;
#endif
#ifdef CONFIG_TRACE_IRQFLAGS
unsigned int irq_events;
unsigned long hardirq_enable_ip;

2
include/rdma/ib_umem.h
View File

@ -42,7 +42,7 @@ struct ib_ucontext;
struct ib_umem_odp;
struct ib_umem {
struct ib_ucontext *context;
struct ib_device *ibdev;
struct mm_struct *owning_mm;
size_t length;
unsigned long address;

58
include/rdma/ib_umem_odp.h
View File

@ -37,11 +37,6 @@
#include <rdma/ib_verbs.h>
#include <linux/interval_tree.h>
struct umem_odp_node {
u64 __subtree_last;
struct rb_node rb;
};
struct ib_umem_odp {
struct ib_umem umem;
struct ib_ucontext_per_mm *per_mm;
@ -72,7 +67,15 @@ struct ib_umem_odp {
int npages;
/* Tree tracking */
struct umem_odp_node interval_tree;
struct interval_tree_node interval_tree;
/*
* An implicit odp umem cannot be DMA mapped, has 0 length, and serves
* only as an anchor for the driver to hold onto the per_mm. FIXME:
* This should be removed and drivers should work with the per_mm
* directly.
*/
bool is_implicit_odp;
struct completion notifier_completion;
int dying;
@ -88,14 +91,13 @@ static inline struct ib_umem_odp *to_ib_umem_odp(struct ib_umem *umem)
/* Returns the first page of an ODP umem. */
static inline unsigned long ib_umem_start(struct ib_umem_odp *umem_odp)
{
return ALIGN_DOWN(umem_odp->umem.address, 1UL << umem_odp->page_shift);
return umem_odp->interval_tree.start;
}
/* Returns the address of the page after the last one of an ODP umem. */
static inline unsigned long ib_umem_end(struct ib_umem_odp *umem_odp)
{
return ALIGN(umem_odp->umem.address + umem_odp->umem.length,
1UL << umem_odp->page_shift);
return umem_odp->interval_tree.last + 1;
}
static inline size_t ib_umem_odp_num_pages(struct ib_umem_odp *umem_odp)
@ -120,25 +122,20 @@ static inline size_t ib_umem_odp_num_pages(struct ib_umem_odp *umem_odp)
#ifdef CONFIG_INFINIBAND_ON_DEMAND_PAGING
struct ib_ucontext_per_mm {
struct ib_ucontext *context;
struct mm_struct *mm;
struct mmu_notifier mn;
struct pid *tgid;
bool active;
struct rb_root_cached umem_tree;
/* Protects umem_tree */
struct rw_semaphore umem_rwsem;
struct mmu_notifier mn;
unsigned int odp_mrs_count;
struct list_head ucontext_list;
struct rcu_head rcu;
};
int ib_umem_odp_get(struct ib_umem_odp *umem_odp, int access);
struct ib_umem_odp *ib_alloc_odp_umem(struct ib_umem_odp *root_umem,
unsigned long addr, size_t size);
struct ib_umem_odp *ib_umem_odp_get(struct ib_udata *udata, unsigned long addr,
size_t size, int access);
struct ib_umem_odp *ib_umem_odp_alloc_implicit(struct ib_udata *udata,
int access);
struct ib_umem_odp *ib_umem_odp_alloc_child(struct ib_umem_odp *root_umem,
unsigned long addr, size_t size);
void ib_umem_odp_release(struct ib_umem_odp *umem_odp);
int ib_umem_odp_map_dma_pages(struct ib_umem_odp *umem_odp, u64 start_offset,
@ -163,8 +160,17 @@ int rbt_ib_umem_for_each_in_range(struct rb_root_cached *root,
* Find first region intersecting with address range.
* Return NULL if not found
*/
struct ib_umem_odp *rbt_ib_umem_lookup(struct rb_root_cached *root,
u64 addr, u64 length);
static inline struct ib_umem_odp *
rbt_ib_umem_lookup(struct rb_root_cached *root, u64 addr, u64 length)
{
struct interval_tree_node *node;
node = interval_tree_iter_first(root, addr, addr + length - 1);
if (!node)
return NULL;
return container_of(node, struct ib_umem_odp, interval_tree);
}
static inline int ib_umem_mmu_notifier_retry(struct ib_umem_odp *umem_odp,
unsigned long mmu_seq)
@ -185,9 +191,11 @@ static inline int ib_umem_mmu_notifier_retry(struct ib_umem_odp *umem_odp,
#else /* CONFIG_INFINIBAND_ON_DEMAND_PAGING */
static inline int ib_umem_odp_get(struct ib_umem_odp *umem_odp, int access)
static inline struct ib_umem_odp *ib_umem_odp_get(struct ib_udata *udata,
unsigned long addr,
size_t size, int access)
{
return -EINVAL;
return ERR_PTR(-EINVAL);
}
static inline void ib_umem_odp_release(struct ib_umem_odp *umem_odp) {}

7
include/rdma/ib_verbs.h
View File

@ -1417,11 +1417,6 @@ struct ib_ucontext {
bool cleanup_retryable;
void (*invalidate_range)(struct ib_umem_odp *umem_odp,
unsigned long start, unsigned long end);
struct mutex per_mm_list_lock;
struct list_head per_mm_list;
struct ib_rdmacg_object cg_obj;
/*
* Implementation details of the RDMA core, don't use in drivers:
@ -2378,6 +2373,8 @@ struct ib_device_ops {
u64 iova);
int (*unmap_fmr)(struct list_head *fmr_list);
int (*dealloc_fmr)(struct ib_fmr *fmr);
void (*invalidate_range)(struct ib_umem_odp *umem_odp,
unsigned long start, unsigned long end);
int (*attach_mcast)(struct ib_qp *qp, union ib_gid *gid, u16 lid);
int (*detach_mcast)(struct ib_qp *qp, union ib_gid *gid, u16 lid);
struct ib_xrcd *(*alloc_xrcd)(struct ib_device *device,

1
kernel/fork.c
View File

@ -1009,7 +1009,6 @@ static struct mm_struct *mm_init(struct mm_struct *mm, struct task_struct *p,
mm_init_owner(mm, p);
RCU_INIT_POINTER(mm->exe_file, NULL);
mmu_notifier_mm_init(mm);
hmm_mm_init(mm);
init_tlb_flush_pending(mm);
#if defined(CONFIG_TRANSPARENT_HUGEPAGE) && !USE_SPLIT_PMD_PTLOCKS
mm->pmd_huge_pte = NULL;

57
kernel/resource.c
View File

@ -1644,6 +1644,34 @@ void resource_list_free(struct list_head *head)
EXPORT_SYMBOL(resource_list_free);
#ifdef CONFIG_DEVICE_PRIVATE
static struct resource *__request_free_mem_region(struct device *dev,
struct resource *base, unsigned long size, const char *name)
{
resource_size_t end, addr;
struct resource *res;
size = ALIGN(size, 1UL << PA_SECTION_SHIFT);
end = min_t(unsigned long, base->end, (1UL << MAX_PHYSMEM_BITS) - 1);
addr = end - size + 1UL;
for (; addr > size && addr >= base->start; addr -= size) {
if (region_intersects(addr, size, 0, IORES_DESC_NONE) !=
REGION_DISJOINT)
continue;
if (dev)
res = devm_request_mem_region(dev, addr, size, name);
else
res = request_mem_region(addr, size, name);
if (!res)
return ERR_PTR(-ENOMEM);
res->desc = IORES_DESC_DEVICE_PRIVATE_MEMORY;
return res;
}
return ERR_PTR(-ERANGE);
}
/**
* devm_request_free_mem_region - find free region for device private memory
*
@ -1658,28 +1686,17 @@ EXPORT_SYMBOL(resource_list_free);
struct resource *devm_request_free_mem_region(struct device *dev,
struct resource *base, unsigned long size)
{
resource_size_t end, addr;
struct resource *res;
size = ALIGN(size, 1UL << PA_SECTION_SHIFT);
end = min_t(unsigned long, base->end, (1UL << MAX_PHYSMEM_BITS) - 1);
addr = end - size + 1UL;
for (; addr > size && addr >= base->start; addr -= size) {
if (region_intersects(addr, size, 0, IORES_DESC_NONE) !=
REGION_DISJOINT)
continue;
res = devm_request_mem_region(dev, addr, size, dev_name(dev));
if (!res)
return ERR_PTR(-ENOMEM);
res->desc = IORES_DESC_DEVICE_PRIVATE_MEMORY;
return res;
}
return ERR_PTR(-ERANGE);
return __request_free_mem_region(dev, base, size, dev_name(dev));
}
EXPORT_SYMBOL_GPL(devm_request_free_mem_region);
struct resource *request_free_mem_region(struct resource *base,
unsigned long size, const char *name)
{
return __request_free_mem_region(NULL, base, size, name);
}
EXPORT_SYMBOL_GPL(request_free_mem_region);
#endif /* CONFIG_DEVICE_PRIVATE */
static int __init strict_iomem(char *str)

19
kernel/sched/core.c
View File

@ -3871,13 +3871,22 @@ static noinline void __schedule_bug(struct task_struct *prev)
/*
* Various schedule()-time debugging checks and statistics:
*/
static inline void schedule_debug(struct task_struct *prev)
static inline void schedule_debug(struct task_struct *prev, bool preempt)
{
#ifdef CONFIG_SCHED_STACK_END_CHECK
if (task_stack_end_corrupted(prev))
panic("corrupted stack end detected inside scheduler\n");
#endif
#ifdef CONFIG_DEBUG_ATOMIC_SLEEP
if (!preempt && prev->state && prev->non_block_count) {
printk(KERN_ERR "BUG: scheduling in a non-blocking section: %s/%d/%i\n",
prev->comm, prev->pid, prev->non_block_count);
dump_stack();
add_taint(TAINT_WARN, LOCKDEP_STILL_OK);
}
#endif
if (unlikely(in_atomic_preempt_off())) {
__schedule_bug(prev);
preempt_count_set(PREEMPT_DISABLED);
@ -3989,7 +3998,7 @@ static void __sched notrace __schedule(bool preempt)
rq = cpu_rq(cpu);
prev = rq->curr;
schedule_debug(prev);
schedule_debug(prev, preempt);
if (sched_feat(HRTICK))
hrtick_clear(rq);
@ -6763,7 +6772,7 @@ void ___might_sleep(const char *file, int line, int preempt_offset)
rcu_sleep_check();
if ((preempt_count_equals(preempt_offset) && !irqs_disabled() &&
!is_idle_task(current)) ||
!is_idle_task(current) && !current->non_block_count) ||
system_state == SYSTEM_BOOTING || system_state > SYSTEM_RUNNING ||
oops_in_progress)
return;
@ -6779,8 +6788,8 @@ void ___might_sleep(const char *file, int line, int preempt_offset)
"BUG: sleeping function called from invalid context at %s:%d\n",
file, line);
printk(KERN_ERR
"in_atomic(): %d, irqs_disabled(): %d, pid: %d, name: %s\n",
in_atomic(), irqs_disabled(),
"in_atomic(): %d, irqs_disabled(): %d, non_block: %d, pid: %d, name: %s\n",
in_atomic(), irqs_disabled(), current->non_block_count,
current->pid, current->comm);
if (task_stack_end_corrupted(current))

20
mm/Kconfig
View File

@ -669,23 +669,17 @@ config ZONE_DEVICE
If FS_DAX is enabled, then say Y.
config MIGRATE_VMA_HELPER
bool
config DEV_PAGEMAP_OPS
bool
#
# Helpers to mirror range of the CPU page tables of a process into device page
# tables.
#
config HMM_MIRROR
bool "HMM mirror CPU page table into a device page table"
depends on (X86_64 || PPC64)
depends on MMU && 64BIT
select MMU_NOTIFIER
help
Select HMM_MIRROR if you want to mirror range of the CPU page table of a
process into a device page table. Here, mirror means "keep synchronized".
Prerequisites: the device must provide the ability to write-protect its
page tables (at PAGE_SIZE granularity), and must be able to recover from
the resulting potential page faults.
bool
depends on MMU
depends on MMU_NOTIFIER
config DEVICE_PRIVATE
bool "Unaddressable device memory (GPU memory, ...)"

490
mm/hmm.c
View File

@ -8,7 +8,7 @@
* Refer to include/linux/hmm.h for information about heterogeneous memory
* management or HMM for short.
*/
#include <linux/mm.h>
#include <linux/pagewalk.h>
#include <linux/hmm.h>
#include <linux/init.h>
#include <linux/rmap.h>
@ -26,101 +26,37 @@
#include <linux/mmu_notifier.h>
#include <linux/memory_hotplug.h>
static const struct mmu_notifier_ops hmm_mmu_notifier_ops;
/**
* hmm_get_or_create - register HMM against an mm (HMM internal)
*
* @mm: mm struct to attach to
* Returns: returns an HMM object, either by referencing the existing
* (per-process) object, or by creating a new one.
*
* This is not intended to be used directly by device drivers. If mm already
* has an HMM struct then it get a reference on it and returns it. Otherwise
* it allocates an HMM struct, initializes it, associate it with the mm and
* returns it.
*/
static struct hmm *hmm_get_or_create(struct mm_struct *mm)
static struct mmu_notifier *hmm_alloc_notifier(struct mm_struct *mm)
{
struct hmm *hmm;
lockdep_assert_held_write(&mm->mmap_sem);
/* Abuse the page_table_lock to also protect mm->hmm. */
spin_lock(&mm->page_table_lock);
hmm = mm->hmm;
if (mm->hmm && kref_get_unless_zero(&mm->hmm->kref))
goto out_unlock;
spin_unlock(&mm->page_table_lock);
hmm = kmalloc(sizeof(*hmm), GFP_KERNEL);
hmm = kzalloc(sizeof(*hmm), GFP_KERNEL);
if (!hmm)
return NULL;
return ERR_PTR(-ENOMEM);
init_waitqueue_head(&hmm->wq);
INIT_LIST_HEAD(&hmm->mirrors);
init_rwsem(&hmm->mirrors_sem);
hmm->mmu_notifier.ops = NULL;
INIT_LIST_HEAD(&hmm->ranges);
spin_lock_init(&hmm->ranges_lock);
kref_init(&hmm->kref);
hmm->notifiers = 0;
hmm->mm = mm;
hmm->mmu_notifier.ops = &hmm_mmu_notifier_ops;
if (__mmu_notifier_register(&hmm->mmu_notifier, mm)) {
kfree(hmm);
return NULL;
}
mmgrab(hmm->mm);
/*
* We hold the exclusive mmap_sem here so we know that mm->hmm is
* still NULL or 0 kref, and is safe to update.
*/
spin_lock(&mm->page_table_lock);
mm->hmm = hmm;
out_unlock:
spin_unlock(&mm->page_table_lock);
return hmm;
return &hmm->mmu_notifier;
}
static void hmm_free_rcu(struct rcu_head *rcu)
static void hmm_free_notifier(struct mmu_notifier *mn)
{
struct hmm *hmm = container_of(rcu, struct hmm, rcu);
struct hmm *hmm = container_of(mn, struct hmm, mmu_notifier);
mmdrop(hmm->mm);
WARN_ON(!list_empty(&hmm->ranges));
WARN_ON(!list_empty(&hmm->mirrors));
kfree(hmm);
}
static void hmm_free(struct kref *kref)
{
struct hmm *hmm = container_of(kref, struct hmm, kref);
spin_lock(&hmm->mm->page_table_lock);
if (hmm->mm->hmm == hmm)
hmm->mm->hmm = NULL;
spin_unlock(&hmm->mm->page_table_lock);
mmu_notifier_unregister_no_release(&hmm->mmu_notifier, hmm->mm);
mmu_notifier_call_srcu(&hmm->rcu, hmm_free_rcu);
}
static inline void hmm_put(struct hmm *hmm)
{
kref_put(&hmm->kref, hmm_free);
}
static void hmm_release(struct mmu_notifier *mn, struct mm_struct *mm)
{
struct hmm *hmm = container_of(mn, struct hmm, mmu_notifier);
struct hmm_mirror *mirror;
/* Bail out if hmm is in the process of being freed */
if (!kref_get_unless_zero(&hmm->kref))
return;
/*
* Since hmm_range_register() holds the mmget() lock hmm_release() is
* prevented as long as a range exists.
@ -137,8 +73,6 @@ static void hmm_release(struct mmu_notifier *mn, struct mm_struct *mm)
mirror->ops->release(mirror);
}
up_read(&hmm->mirrors_sem);
hmm_put(hmm);
}
static void notifiers_decrement(struct hmm *hmm)
@ -165,23 +99,14 @@ static int hmm_invalidate_range_start(struct mmu_notifier *mn,
{
struct hmm *hmm = container_of(mn, struct hmm, mmu_notifier);
struct hmm_mirror *mirror;
struct hmm_update update;
struct hmm_range *range;
unsigned long flags;
int ret = 0;
if (!kref_get_unless_zero(&hmm->kref))
return 0;
update.start = nrange->start;
update.end = nrange->end;
update.event = HMM_UPDATE_INVALIDATE;
update.blockable = mmu_notifier_range_blockable(nrange);
spin_lock_irqsave(&hmm->ranges_lock, flags);
hmm->notifiers++;
list_for_each_entry(range, &hmm->ranges, list) {
if (update.end < range->start || update.start >= range->end)
if (nrange->end < range->start || nrange->start >= range->end)
continue;
range->valid = false;
@ -198,9 +123,10 @@ static int hmm_invalidate_range_start(struct mmu_notifier *mn,
list_for_each_entry(mirror, &hmm->mirrors, list) {
int rc;
rc = mirror->ops->sync_cpu_device_pagetables(mirror, &update);
rc = mirror->ops->sync_cpu_device_pagetables(mirror, nrange);
if (rc) {
if (WARN_ON(update.blockable || rc != -EAGAIN))
if (WARN_ON(mmu_notifier_range_blockable(nrange) ||
rc != -EAGAIN))
continue;
ret = -EAGAIN;
break;
@ -211,7 +137,6 @@ static int hmm_invalidate_range_start(struct mmu_notifier *mn,
out:
if (ret)
notifiers_decrement(hmm);
hmm_put(hmm);
return ret;
}
@ -220,17 +145,15 @@ static void hmm_invalidate_range_end(struct mmu_notifier *mn,
{
struct hmm *hmm = container_of(mn, struct hmm, mmu_notifier);
if (!kref_get_unless_zero(&hmm->kref))
return;
notifiers_decrement(hmm);
hmm_put(hmm);
}
static const struct mmu_notifier_ops hmm_mmu_notifier_ops = {
.release = hmm_release,
.invalidate_range_start = hmm_invalidate_range_start,
.invalidate_range_end = hmm_invalidate_range_end,
.alloc_notifier = hmm_alloc_notifier,
.free_notifier = hmm_free_notifier,
};
/*
@ -242,18 +165,27 @@ static const struct mmu_notifier_ops hmm_mmu_notifier_ops = {
*
* To start mirroring a process address space, the device driver must register
* an HMM mirror struct.
*
* The caller cannot unregister the hmm_mirror while any ranges are
* registered.
*
* Callers using this function must put a call to mmu_notifier_synchronize()
* in their module exit functions.
*/
int hmm_mirror_register(struct hmm_mirror *mirror, struct mm_struct *mm)
{
struct mmu_notifier *mn;
lockdep_assert_held_write(&mm->mmap_sem);
/* Sanity check */
if (!mm || !mirror || !mirror->ops)
return -EINVAL;
mirror->hmm = hmm_get_or_create(mm);
if (!mirror->hmm)
return -ENOMEM;
mn = mmu_notifier_get_locked(&hmm_mmu_notifier_ops, mm);
if (IS_ERR(mn))
return PTR_ERR(mn);
mirror->hmm = container_of(mn, struct hmm, mmu_notifier);
down_write(&mirror->hmm->mirrors_sem);
list_add(&mirror->list, &mirror->hmm->mirrors);
@ -277,7 +209,7 @@ void hmm_mirror_unregister(struct hmm_mirror *mirror)
down_write(&hmm->mirrors_sem);
list_del(&mirror->list);
up_write(&hmm->mirrors_sem);
hmm_put(hmm);
mmu_notifier_put(&hmm->mmu_notifier);
}
EXPORT_SYMBOL(hmm_mirror_unregister);
@ -285,8 +217,7 @@ struct hmm_vma_walk {
struct hmm_range *range;
struct dev_pagemap *pgmap;
unsigned long last;
bool fault;
bool block;
unsigned int flags;
};
static int hmm_vma_do_fault(struct mm_walk *walk, unsigned long addr,
@ -298,17 +229,27 @@ static int hmm_vma_do_fault(struct mm_walk *walk, unsigned long addr,
struct vm_area_struct *vma = walk->vma;
vm_fault_t ret;
flags |= hmm_vma_walk->block ? 0 : FAULT_FLAG_ALLOW_RETRY;
flags |= write_fault ? FAULT_FLAG_WRITE : 0;
if (!vma)
goto err;
if (hmm_vma_walk->flags & HMM_FAULT_ALLOW_RETRY)
flags |= FAULT_FLAG_ALLOW_RETRY;
if (write_fault)
flags |= FAULT_FLAG_WRITE;
ret = handle_mm_fault(vma, addr, flags);
if (ret & VM_FAULT_RETRY)
if (ret & VM_FAULT_RETRY) {
/* Note, handle_mm_fault did up_read(&mm->mmap_sem)) */
return -EAGAIN;
if (ret & VM_FAULT_ERROR) {
*pfn = range->values[HMM_PFN_ERROR];
return -EFAULT;
}
if (ret & VM_FAULT_ERROR)
goto err;
return -EBUSY;
err:
*pfn = range->values[HMM_PFN_ERROR];
return -EFAULT;
}
static int hmm_pfns_bad(unsigned long addr,
@ -328,8 +269,8 @@ static int hmm_pfns_bad(unsigned long addr,
}
/*
* hmm_vma_walk_hole() - handle a range lacking valid pmd or pte(s)
* @start: range virtual start address (inclusive)
* hmm_vma_walk_hole_() - handle a range lacking valid pmd or pte(s)
* @addr: range virtual start address (inclusive)
* @end: range virtual end address (exclusive)
* @fault: should we fault or not ?
* @write_fault: write fault ?
@ -346,13 +287,15 @@ static int hmm_vma_walk_hole_(unsigned long addr, unsigned long end,
struct hmm_vma_walk *hmm_vma_walk = walk->private;
struct hmm_range *range = hmm_vma_walk->range;
uint64_t *pfns = range->pfns;
unsigned long i, page_size;
unsigned long i;
hmm_vma_walk->last = addr;
page_size = hmm_range_page_size(range);
i = (addr - range->start) >> range->page_shift;
i = (addr - range->start) >> PAGE_SHIFT;
for (; addr < end; addr += page_size, i++) {
if (write_fault && walk->vma && !(walk->vma->vm_flags & VM_WRITE))
return -EPERM;
for (; addr < end; addr += PAGE_SIZE, i++) {
pfns[i] = range->values[HMM_PFN_NONE];
if (fault || write_fault) {
int ret;
@ -373,15 +316,15 @@ static inline void hmm_pte_need_fault(const struct hmm_vma_walk *hmm_vma_walk,
{
struct hmm_range *range = hmm_vma_walk->range;
if (!hmm_vma_walk->fault)
if (hmm_vma_walk->flags & HMM_FAULT_SNAPSHOT)
return;
/*
* So we not only consider the individual per page request we also
* consider the default flags requested for the range. The API can
* be use in 2 fashions. The first one where the HMM user coalesce
* multiple page fault into one request and set flags per pfns for
* of those faults. The second one where the HMM user want to pre-
* be used 2 ways. The first one where the HMM user coalesces
* multiple page faults into one request and sets flags per pfn for
* those faults. The second one where the HMM user wants to pre-
* fault a range with specific flags. For the latter one it is a
* waste to have the user pre-fill the pfn arrays with a default
* flags value.
@ -391,7 +334,7 @@ static inline void hmm_pte_need_fault(const struct hmm_vma_walk *hmm_vma_walk,
/* We aren't ask to do anything ... */
if (!(pfns & range->flags[HMM_PFN_VALID]))
return;
/* If this is device memory than only fault if explicitly requested */
/* If this is device memory then only fault if explicitly requested */
if ((cpu_flags & range->flags[HMM_PFN_DEVICE_PRIVATE])) {
/* Do we fault on device memory ? */
if (pfns & range->flags[HMM_PFN_DEVICE_PRIVATE]) {
@ -418,7 +361,7 @@ static void hmm_range_need_fault(const struct hmm_vma_walk *hmm_vma_walk,
{
unsigned long i;
if (!hmm_vma_walk->fault) {
if (hmm_vma_walk->flags & HMM_FAULT_SNAPSHOT) {
*fault = *write_fault = false;
return;
}
@ -458,22 +401,10 @@ static inline uint64_t pmd_to_hmm_pfn_flags(struct hmm_range *range, pmd_t pmd)
range->flags[HMM_PFN_VALID];
}
static inline uint64_t pud_to_hmm_pfn_flags(struct hmm_range *range, pud_t pud)
{
if (!pud_present(pud))
return 0;
return pud_write(pud) ? range->flags[HMM_PFN_VALID] |
range->flags[HMM_PFN_WRITE] :
range->flags[HMM_PFN_VALID];
}
static int hmm_vma_handle_pmd(struct mm_walk *walk,
unsigned long addr,
unsigned long end,
uint64_t *pfns,
pmd_t pmd)
{
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
static int hmm_vma_handle_pmd(struct mm_walk *walk, unsigned long addr,
unsigned long end, uint64_t *pfns, pmd_t pmd)
{
struct hmm_vma_walk *hmm_vma_walk = walk->private;
struct hmm_range *range = hmm_vma_walk->range;
unsigned long pfn, npages, i;
@ -488,7 +419,7 @@ static int hmm_vma_handle_pmd(struct mm_walk *walk,
if (pmd_protnone(pmd) || fault || write_fault)
return hmm_vma_walk_hole_(addr, end, fault, write_fault, walk);
pfn = pmd_pfn(pmd) + pte_index(addr);
pfn = pmd_pfn(pmd) + ((addr & ~PMD_MASK) >> PAGE_SHIFT);
for (i = 0; addr < end; addr += PAGE_SIZE, i++, pfn++) {
if (pmd_devmap(pmd)) {
hmm_vma_walk->pgmap = get_dev_pagemap(pfn,
@ -504,11 +435,12 @@ static int hmm_vma_handle_pmd(struct mm_walk *walk,
}
hmm_vma_walk->last = end;
return 0;
#else
/* If THP is not enabled then we should never reach that code ! */
return -EINVAL;
#endif
}
#else /* CONFIG_TRANSPARENT_HUGEPAGE */
/* stub to allow the code below to compile */
int hmm_vma_handle_pmd(struct mm_walk *walk, unsigned long addr,
unsigned long end, uint64_t *pfns, pmd_t pmd);
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
static inline uint64_t pte_to_hmm_pfn_flags(struct hmm_range *range, pte_t pte)
{
@ -525,7 +457,6 @@ static int hmm_vma_handle_pte(struct mm_walk *walk, unsigned long addr,
{
struct hmm_vma_walk *hmm_vma_walk = walk->private;
struct hmm_range *range = hmm_vma_walk->range;
struct vm_area_struct *vma = walk->vma;
bool fault, write_fault;
uint64_t cpu_flags;
pte_t pte = *ptep;
@ -546,6 +477,9 @@ static int hmm_vma_handle_pte(struct mm_walk *walk, unsigned long addr,
swp_entry_t entry = pte_to_swp_entry(pte);
if (!non_swap_entry(entry)) {
cpu_flags = pte_to_hmm_pfn_flags(range, pte);
hmm_pte_need_fault(hmm_vma_walk, orig_pfn, cpu_flags,
&fault, &write_fault);
if (fault || write_fault)
goto fault;
return 0;
@ -574,8 +508,7 @@ static int hmm_vma_handle_pte(struct mm_walk *walk, unsigned long addr,
if (fault || write_fault) {
pte_unmap(ptep);
hmm_vma_walk->last = addr;
migration_entry_wait(vma->vm_mm,
pmdp, addr);
migration_entry_wait(walk->mm, pmdp, addr);
return -EBUSY;
}
return 0;
@ -623,21 +556,16 @@ static int hmm_vma_walk_pmd(pmd_t *pmdp,
{
struct hmm_vma_walk *hmm_vma_walk = walk->private;
struct hmm_range *range = hmm_vma_walk->range;
struct vm_area_struct *vma = walk->vma;
uint64_t *pfns = range->pfns;
unsigned long addr = start, i;
pte_t *ptep;
pmd_t pmd;
again:
pmd = READ_ONCE(*pmdp);
if (pmd_none(pmd))
return hmm_vma_walk_hole(start, end, walk);
if (pmd_huge(pmd) && (range->vma->vm_flags & VM_HUGETLB))
return hmm_pfns_bad(start, end, walk);
if (thp_migration_supported() && is_pmd_migration_entry(pmd)) {
bool fault, write_fault;
unsigned long npages;
@ -651,7 +579,7 @@ again:
0, &fault, &write_fault);
if (fault || write_fault) {
hmm_vma_walk->last = addr;
pmd_migration_entry_wait(vma->vm_mm, pmdp);
pmd_migration_entry_wait(walk->mm, pmdp);
return -EBUSY;
}
return 0;
@ -660,11 +588,11 @@ again:
if (pmd_devmap(pmd) || pmd_trans_huge(pmd)) {
/*
* No need to take pmd_lock here, even if some other threads
* No need to take pmd_lock here, even if some other thread
* is splitting the huge pmd we will get that event through
* mmu_notifier callback.
*
* So just read pmd value and check again its a transparent
* So just read pmd value and check again it's a transparent
* huge or device mapping one and compute corresponding pfn
* values.
*/
@ -678,7 +606,7 @@ again:
}
/*
* We have handled all the valid case above ie either none, migration,
* We have handled all the valid cases above ie either none, migration,
* huge or transparent huge. At this point either it is a valid pmd
* entry pointing to pte directory or it is a bad pmd that will not
* recover.
@ -714,10 +642,19 @@ again:
return 0;
}
static int hmm_vma_walk_pud(pud_t *pudp,
unsigned long start,
unsigned long end,
struct mm_walk *walk)
#if defined(CONFIG_ARCH_HAS_PTE_DEVMAP) && \
defined(CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD)
static inline uint64_t pud_to_hmm_pfn_flags(struct hmm_range *range, pud_t pud)
{
if (!pud_present(pud))
return 0;
return pud_write(pud) ? range->flags[HMM_PFN_VALID] |
range->flags[HMM_PFN_WRITE] :
range->flags[HMM_PFN_VALID];
}
static int hmm_vma_walk_pud(pud_t *pudp, unsigned long start, unsigned long end,
struct mm_walk *walk)
{
struct hmm_vma_walk *hmm_vma_walk = walk->private;
struct hmm_range *range = hmm_vma_walk->range;
@ -781,42 +718,29 @@ again:
return 0;
}
#else
#define hmm_vma_walk_pud NULL
#endif
#ifdef CONFIG_HUGETLB_PAGE
static int hmm_vma_walk_hugetlb_entry(pte_t *pte, unsigned long hmask,
unsigned long start, unsigned long end,
struct mm_walk *walk)
{
#ifdef CONFIG_HUGETLB_PAGE
unsigned long addr = start, i, pfn, mask, size, pfn_inc;
unsigned long addr = start, i, pfn;
struct hmm_vma_walk *hmm_vma_walk = walk->private;
struct hmm_range *range = hmm_vma_walk->range;
struct vm_area_struct *vma = walk->vma;
struct hstate *h = hstate_vma(vma);
uint64_t orig_pfn, cpu_flags;
bool fault, write_fault;
spinlock_t *ptl;
pte_t entry;
int ret = 0;
size = 1UL << huge_page_shift(h);
mask = size - 1;
if (range->page_shift != PAGE_SHIFT) {
/* Make sure we are looking at full page. */
if (start & mask)
return -EINVAL;
if (end < (start + size))
return -EINVAL;
pfn_inc = size >> PAGE_SHIFT;
} else {
pfn_inc = 1;
size = PAGE_SIZE;
}
ptl = huge_pte_lock(hstate_vma(walk->vma), walk->mm, pte);
ptl = huge_pte_lock(hstate_vma(vma), walk->mm, pte);
entry = huge_ptep_get(pte);
i = (start - range->start) >> range->page_shift;
i = (start - range->start) >> PAGE_SHIFT;
orig_pfn = range->pfns[i];
range->pfns[i] = range->values[HMM_PFN_NONE];
cpu_flags = pte_to_hmm_pfn_flags(range, entry);
@ -828,8 +752,8 @@ static int hmm_vma_walk_hugetlb_entry(pte_t *pte, unsigned long hmask,
goto unlock;
}
pfn = pte_pfn(entry) + ((start & mask) >> range->page_shift);
for (; addr < end; addr += size, i++, pfn += pfn_inc)
pfn = pte_pfn(entry) + ((start & ~hmask) >> PAGE_SHIFT);
for (; addr < end; addr += PAGE_SIZE, i++, pfn++)
range->pfns[i] = hmm_device_entry_from_pfn(range, pfn) |
cpu_flags;
hmm_vma_walk->last = end;
@ -841,10 +765,10 @@ unlock:
return hmm_vma_walk_hole_(addr, end, fault, write_fault, walk);
return ret;
#else /* CONFIG_HUGETLB_PAGE */
return -EINVAL;
#endif
}
#else
#define hmm_vma_walk_hugetlb_entry NULL
#endif /* CONFIG_HUGETLB_PAGE */
static void hmm_pfns_clear(struct hmm_range *range,
uint64_t *pfns,
@ -859,44 +783,32 @@ static void hmm_pfns_clear(struct hmm_range *range,
* hmm_range_register() - start tracking change to CPU page table over a range
* @range: range
* @mm: the mm struct for the range of virtual address
* @start: start virtual address (inclusive)
* @end: end virtual address (exclusive)
* @page_shift: expect page shift for the range
* Returns 0 on success, -EFAULT if the address space is no longer valid
*
* Return: 0 on success, -EFAULT if the address space is no longer valid
*
* Track updates to the CPU page table see include/linux/hmm.h
*/
int hmm_range_register(struct hmm_range *range,
struct hmm_mirror *mirror,
unsigned long start,
unsigned long end,
unsigned page_shift)
int hmm_range_register(struct hmm_range *range, struct hmm_mirror *mirror)
{
unsigned long mask = ((1UL << page_shift) - 1UL);
struct hmm *hmm = mirror->hmm;
unsigned long flags;
range->valid = false;
range->hmm = NULL;
if ((start & mask) || (end & mask))
if ((range->start & (PAGE_SIZE - 1)) || (range->end & (PAGE_SIZE - 1)))
return -EINVAL;
if (start >= end)
if (range->start >= range->end)
return -EINVAL;
range->page_shift = page_shift;
range->start = start;
range->end = end;
/* Prevent hmm_release() from running while the range is valid */
if (!mmget_not_zero(hmm->mm))
if (!mmget_not_zero(hmm->mmu_notifier.mm))
return -EFAULT;
/* Initialize range to track CPU page table updates. */
spin_lock_irqsave(&hmm->ranges_lock, flags);
range->hmm = hmm;
kref_get(&hmm->kref);
list_add(&range->list, &hmm->ranges);
/*
@ -928,8 +840,7 @@ void hmm_range_unregister(struct hmm_range *range)
spin_unlock_irqrestore(&hmm->ranges_lock, flags);
/* Drop reference taken by hmm_range_register() */
mmput(hmm->mm);
hmm_put(hmm);
mmput(hmm->mmu_notifier.mm);
/*
* The range is now invalid and the ref on the hmm is dropped, so
@ -941,105 +852,33 @@ void hmm_range_unregister(struct hmm_range *range)
}
EXPORT_SYMBOL(hmm_range_unregister);
/*
* hmm_range_snapshot() - snapshot CPU page table for a range
* @range: range
* Return: -EINVAL if invalid argument, -ENOMEM out of memory, -EPERM invalid
* permission (for instance asking for write and range is read only),
* -EBUSY if you need to retry, -EFAULT invalid (ie either no valid
* vma or it is illegal to access that range), number of valid pages
* in range->pfns[] (from range start address).
static const struct mm_walk_ops hmm_walk_ops = {
.pud_entry = hmm_vma_walk_pud,
.pmd_entry = hmm_vma_walk_pmd,
.pte_hole = hmm_vma_walk_hole,
.hugetlb_entry = hmm_vma_walk_hugetlb_entry,
};
/**
* hmm_range_fault - try to fault some address in a virtual address range
* @range: range being faulted
* @flags: HMM_FAULT_* flags
*
* This snapshots the CPU page table for a range of virtual addresses. Snapshot
* validity is tracked by range struct. See in include/linux/hmm.h for example
* on how to use.
*/
long hmm_range_snapshot(struct hmm_range *range)
{
const unsigned long device_vma = VM_IO | VM_PFNMAP | VM_MIXEDMAP;
unsigned long start = range->start, end;
struct hmm_vma_walk hmm_vma_walk;
struct hmm *hmm = range->hmm;
struct vm_area_struct *vma;
struct mm_walk mm_walk;
lockdep_assert_held(&hmm->mm->mmap_sem);
do {
/* If range is no longer valid force retry. */
if (!range->valid)
return -EBUSY;
vma = find_vma(hmm->mm, start);
if (vma == NULL || (vma->vm_flags & device_vma))
return -EFAULT;
if (is_vm_hugetlb_page(vma)) {
if (huge_page_shift(hstate_vma(vma)) !=
range->page_shift &&
range->page_shift != PAGE_SHIFT)
return -EINVAL;
} else {
if (range->page_shift != PAGE_SHIFT)
return -EINVAL;
}
if (!(vma->vm_flags & VM_READ)) {
/*
* If vma do not allow read access, then assume that it
* does not allow write access, either. HMM does not
* support architecture that allow write without read.
*/
hmm_pfns_clear(range, range->pfns,
range->start, range->end);
return -EPERM;
}
range->vma = vma;
hmm_vma_walk.pgmap = NULL;
hmm_vma_walk.last = start;
hmm_vma_walk.fault = false;
hmm_vma_walk.range = range;
mm_walk.private = &hmm_vma_walk;
end = min(range->end, vma->vm_end);
mm_walk.vma = vma;
mm_walk.mm = vma->vm_mm;
mm_walk.pte_entry = NULL;
mm_walk.test_walk = NULL;
mm_walk.hugetlb_entry = NULL;
mm_walk.pud_entry = hmm_vma_walk_pud;
mm_walk.pmd_entry = hmm_vma_walk_pmd;
mm_walk.pte_hole = hmm_vma_walk_hole;
mm_walk.hugetlb_entry = hmm_vma_walk_hugetlb_entry;
walk_page_range(start, end, &mm_walk);
start = end;
} while (start < range->end);
return (hmm_vma_walk.last - range->start) >> PAGE_SHIFT;
}
EXPORT_SYMBOL(hmm_range_snapshot);
/*
* hmm_range_fault() - try to fault some address in a virtual address range
* @range: range being faulted
* @block: allow blocking on fault (if true it sleeps and do not drop mmap_sem)
* Return: number of valid pages in range->pfns[] (from range start
* address). This may be zero. If the return value is negative,
* then one of the following values may be returned:
* Return: the number of valid pages in range->pfns[] (from range start
* address), which may be zero. On error one of the following status codes
* can be returned:
*
* -EINVAL invalid arguments or mm or virtual address are in an
* invalid vma (for instance device file vma).
* -ENOMEM: Out of memory.
* -EPERM: Invalid permission (for instance asking for write and
* range is read only).
* -EAGAIN: If you need to retry and mmap_sem was drop. This can only
* happens if block argument is false.
* -EBUSY: If the the range is being invalidated and you should wait
* for invalidation to finish.
* -EFAULT: Invalid (ie either no valid vma or it is illegal to access
* that range), number of valid pages in range->pfns[] (from
* range start address).
* -EINVAL: Invalid arguments or mm or virtual address is in an invalid vma
* (e.g., device file vma).
* -ENOMEM: Out of memory.
* -EPERM: Invalid permission (e.g., asking for write and range is read
* only).
* -EAGAIN: A page fault needs to be retried and mmap_sem was dropped.
* -EBUSY: The range has been invalidated and the caller needs to wait for
* the invalidation to finish.
* -EFAULT: Invalid (i.e., either no valid vma or it is illegal to access
* that range) number of valid pages in range->pfns[] (from
* range start address).
*
* This is similar to a regular CPU page fault except that it will not trigger
* any memory migration if the memory being faulted is not accessible by CPUs
@ -1048,37 +887,26 @@ EXPORT_SYMBOL(hmm_range_snapshot);
* On error, for one virtual address in the range, the function will mark the
* corresponding HMM pfn entry with an error flag.
*/
long hmm_range_fault(struct hmm_range *range, bool block)
long hmm_range_fault(struct hmm_range *range, unsigned int flags)
{
const unsigned long device_vma = VM_IO | VM_PFNMAP | VM_MIXEDMAP;
unsigned long start = range->start, end;
struct hmm_vma_walk hmm_vma_walk;
struct hmm *hmm = range->hmm;
struct vm_area_struct *vma;
struct mm_walk mm_walk;
int ret;
lockdep_assert_held(&hmm->mm->mmap_sem);
lockdep_assert_held(&hmm->mmu_notifier.mm->mmap_sem);
do {
/* If range is no longer valid force retry. */
if (!range->valid)
return -EBUSY;
vma = find_vma(hmm->mm, start);
vma = find_vma(hmm->mmu_notifier.mm, start);
if (vma == NULL || (vma->vm_flags & device_vma))
return -EFAULT;
if (is_vm_hugetlb_page(vma)) {
if (huge_page_shift(hstate_vma(vma)) !=
range->page_shift &&
range->page_shift != PAGE_SHIFT)
return -EINVAL;
} else {
if (range->page_shift != PAGE_SHIFT)
return -EINVAL;
}
if (!(vma->vm_flags & VM_READ)) {
/*
* If vma do not allow read access, then assume that it
@ -1090,27 +918,18 @@ long hmm_range_fault(struct hmm_range *range, bool block)
return -EPERM;
}
range->vma = vma;
hmm_vma_walk.pgmap = NULL;
hmm_vma_walk.last = start;
hmm_vma_walk.fault = true;
hmm_vma_walk.block = block;
hmm_vma_walk.flags = flags;
hmm_vma_walk.range = range;
mm_walk.private = &hmm_vma_walk;
end = min(range->end, vma->vm_end);
mm_walk.vma = vma;
mm_walk.mm = vma->vm_mm;
mm_walk.pte_entry = NULL;
mm_walk.test_walk = NULL;
mm_walk.hugetlb_entry = NULL;
mm_walk.pud_entry = hmm_vma_walk_pud;
mm_walk.pmd_entry = hmm_vma_walk_pmd;
mm_walk.pte_hole = hmm_vma_walk_hole;
mm_walk.hugetlb_entry = hmm_vma_walk_hugetlb_entry;
walk_page_range(vma->vm_mm, start, end, &hmm_walk_ops,
&hmm_vma_walk);
do {
ret = walk_page_range(start, end, &mm_walk);
ret = walk_page_range(vma->vm_mm, start, end,
&hmm_walk_ops, &hmm_vma_walk);
start = hmm_vma_walk.last;
/* Keep trying while the range is valid. */
@ -1133,25 +952,22 @@ long hmm_range_fault(struct hmm_range *range, bool block)
EXPORT_SYMBOL(hmm_range_fault);
/**
* hmm_range_dma_map() - hmm_range_fault() and dma map page all in one.
* @range: range being faulted
* @device: device against to dma map page to
* @daddrs: dma address of mapped pages
* @block: allow blocking on fault (if true it sleeps and do not drop mmap_sem)
* Return: number of pages mapped on success, -EAGAIN if mmap_sem have been
* drop and you need to try again, some other error value otherwise
* hmm_range_dma_map - hmm_range_fault() and dma map page all in one.
* @range: range being faulted
* @device: device to map page to
* @daddrs: array of dma addresses for the mapped pages
* @flags: HMM_FAULT_*
*
* Note same usage pattern as hmm_range_fault().
* Return: the number of pages mapped on success (including zero), or any
* status return from hmm_range_fault() otherwise.
*/
long hmm_range_dma_map(struct hmm_range *range,
struct device *device,
dma_addr_t *daddrs,
bool block)
long hmm_range_dma_map(struct hmm_range *range, struct device *device,
dma_addr_t *daddrs, unsigned int flags)
{
unsigned long i, npages, mapped;
long ret;
ret = hmm_range_fault(range, block);
ret = hmm_range_fault(range, flags);
if (ret <= 0)
return ret ? ret : -EBUSY;
@ -1222,7 +1038,6 @@ EXPORT_SYMBOL(hmm_range_dma_map);
/**
* hmm_range_dma_unmap() - unmap range of that was map with hmm_range_dma_map()
* @range: range being unmapped
* @vma: the vma against which the range (optional)
* @device: device against which dma map was done
* @daddrs: dma address of mapped pages
* @dirty: dirty page if it had the write flag set
@ -1234,7 +1049,6 @@ EXPORT_SYMBOL(hmm_range_dma_map);
* concurrent mmu notifier or sync_cpu_device_pagetables() to make progress.
*/
long hmm_range_dma_unmap(struct hmm_range *range,
struct vm_area_struct *vma,
struct device *device,
dma_addr_t *daddrs,
bool dirty)

42
mm/madvise.c
View File

@ -21,6 +21,7 @@
#include <linux/file.h>
#include <linux/blkdev.h>
#include <linux/backing-dev.h>
#include <linux/pagewalk.h>
#include <linux/swap.h>
#include <linux/swapops.h>
#include <linux/shmem_fs.h>
@ -226,19 +227,9 @@ static int swapin_walk_pmd_entry(pmd_t *pmd, unsigned long start,
return 0;
}
static void force_swapin_readahead(struct vm_area_struct *vma,
unsigned long start, unsigned long end)
{
struct mm_walk walk = {
.mm = vma->vm_mm,
.pmd_entry = swapin_walk_pmd_entry,
.private = vma,
};
walk_page_range(start, end, &walk);
lru_add_drain(); /* Push any new pages onto the LRU now */
}
static const struct mm_walk_ops swapin_walk_ops = {
.pmd_entry = swapin_walk_pmd_entry,
};
static void force_shm_swapin_readahead(struct vm_area_struct *vma,
unsigned long start, unsigned long end,
@ -281,7 +272,8 @@ static long madvise_willneed(struct vm_area_struct *vma,
*prev = vma;
#ifdef CONFIG_SWAP
if (!file) {
force_swapin_readahead(vma, start, end);
walk_page_range(vma->vm_mm, start, end, &swapin_walk_ops, vma);
lru_add_drain(); /* Push any new pages onto the LRU now */
return 0;
}
@ -450,20 +442,9 @@ next:
return 0;
}
static void madvise_free_page_range(struct mmu_gather *tlb,
struct vm_area_struct *vma,
unsigned long addr, unsigned long end)
{
struct mm_walk free_walk = {
.pmd_entry = madvise_free_pte_range,
.mm = vma->vm_mm,
.private = tlb,
};
tlb_start_vma(tlb, vma);
walk_page_range(addr, end, &free_walk);
tlb_end_vma(tlb, vma);
}
static const struct mm_walk_ops madvise_free_walk_ops = {
.pmd_entry = madvise_free_pte_range,
};
static int madvise_free_single_vma(struct vm_area_struct *vma,
unsigned long start_addr, unsigned long end_addr)
@ -490,7 +471,10 @@ static int madvise_free_single_vma(struct vm_area_struct *vma,
update_hiwater_rss(mm);
mmu_notifier_invalidate_range_start(&range);
madvise_free_page_range(&tlb, vma, range.start, range.end);
tlb_start_vma(&tlb, vma);
walk_page_range(vma->vm_mm, range.start, range.end,
&madvise_free_walk_ops, &tlb);
tlb_end_vma(&tlb, vma);
mmu_notifier_invalidate_range_end(&range);
tlb_finish_mmu(&tlb, range.start, range.end);

25
mm/memcontrol.c
View File

@ -25,7 +25,7 @@
#include <linux/page_counter.h>
#include <linux/memcontrol.h>
#include <linux/cgroup.h>
#include <linux/mm.h>
#include <linux/pagewalk.h>
#include <linux/sched/mm.h>
#include <linux/shmem_fs.h>
#include <linux/hugetlb.h>
@ -5499,17 +5499,16 @@ static int mem_cgroup_count_precharge_pte_range(pmd_t *pmd,
return 0;
}
static const struct mm_walk_ops precharge_walk_ops = {
.pmd_entry = mem_cgroup_count_precharge_pte_range,
};
static unsigned long mem_cgroup_count_precharge(struct mm_struct *mm)
{
unsigned long precharge;
struct mm_walk mem_cgroup_count_precharge_walk = {
.pmd_entry = mem_cgroup_count_precharge_pte_range,
.mm = mm,
};
down_read(&mm->mmap_sem);
walk_page_range(0, mm->highest_vm_end,
&mem_cgroup_count_precharge_walk);
walk_page_range(mm, 0, mm->highest_vm_end, &precharge_walk_ops, NULL);
up_read(&mm->mmap_sem);
precharge = mc.precharge;
@ -5778,13 +5777,12 @@ put: /* get_mctgt_type() gets the page */
return ret;
}
static const struct mm_walk_ops charge_walk_ops = {
.pmd_entry = mem_cgroup_move_charge_pte_range,
};
static void mem_cgroup_move_charge(void)
{
struct mm_walk mem_cgroup_move_charge_walk = {
.pmd_entry = mem_cgroup_move_charge_pte_range,
.mm = mc.mm,
};
lru_add_drain_all();
/*
* Signal lock_page_memcg() to take the memcg's move_lock
@ -5810,7 +5808,8 @@ retry:
* When we have consumed all precharges and failed in doing
* additional charge, the page walk just aborts.
*/
walk_page_range(0, mc.mm->highest_vm_end, &mem_cgroup_move_charge_walk);
walk_page_range(mc.mm, 0, mc.mm->highest_vm_end, &charge_walk_ops,
NULL);
up_read(&mc.mm->mmap_sem);
atomic_dec(&mc.from->moving_account);

17
mm/mempolicy.c
View File

@ -68,7 +68,7 @@
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/mempolicy.h>
#include <linux/mm.h>
#include <linux/pagewalk.h>
#include <linux/highmem.h>
#include <linux/hugetlb.h>
#include <linux/kernel.h>
@ -655,6 +655,12 @@ static int queue_pages_test_walk(unsigned long start, unsigned long end,
return 1;
}
static const struct mm_walk_ops queue_pages_walk_ops = {
.hugetlb_entry = queue_pages_hugetlb,
.pmd_entry = queue_pages_pte_range,
.test_walk = queue_pages_test_walk,
};
/*
* Walk through page tables and collect pages to be migrated.
*
@ -679,15 +685,8 @@ queue_pages_range(struct mm_struct *mm, unsigned long start, unsigned long end,
.nmask = nodes,
.prev = NULL,
};
struct mm_walk queue_pages_walk = {
.hugetlb_entry = queue_pages_hugetlb,
.pmd_entry = queue_pages_pte_range,
.test_walk = queue_pages_test_walk,
.mm = mm,
.private = &qp,
};
return walk_page_range(start, end, &queue_pages_walk);
return walk_page_range(mm, start, end, &queue_pages_walk_ops, &qp);
}
/*

105
mm/memremap.c
View File

@ -21,13 +21,13 @@ DEFINE_STATIC_KEY_FALSE(devmap_managed_key);
EXPORT_SYMBOL(devmap_managed_key);
static atomic_t devmap_managed_enable;
static void devmap_managed_enable_put(void *data)
static void devmap_managed_enable_put(void)
{
if (atomic_dec_and_test(&devmap_managed_enable))
static_branch_disable(&devmap_managed_key);
}
static int devmap_managed_enable_get(struct device *dev, struct dev_pagemap *pgmap)
static int devmap_managed_enable_get(struct dev_pagemap *pgmap)
{
if (!pgmap->ops || !pgmap->ops->page_free) {
WARN(1, "Missing page_free method\n");
@ -36,13 +36,16 @@ static int devmap_managed_enable_get(struct device *dev, struct dev_pagemap *pgm
if (atomic_inc_return(&devmap_managed_enable) == 1)
static_branch_enable(&devmap_managed_key);
return devm_add_action_or_reset(dev, devmap_managed_enable_put, NULL);
return 0;
}
#else
static int devmap_managed_enable_get(struct device *dev, struct dev_pagemap *pgmap)
static int devmap_managed_enable_get(struct dev_pagemap *pgmap)
{
return -EINVAL;
}
static void devmap_managed_enable_put(void)
{
}
#endif /* CONFIG_DEV_PAGEMAP_OPS */
static void pgmap_array_delete(struct resource *res)
@ -99,10 +102,8 @@ static void dev_pagemap_cleanup(struct dev_pagemap *pgmap)
pgmap->ref = NULL;
}
static void devm_memremap_pages_release(void *data)
void memunmap_pages(struct dev_pagemap *pgmap)
{
struct dev_pagemap *pgmap = data;
struct device *dev = pgmap->dev;
struct resource *res = &pgmap->res;
unsigned long pfn;
int nid;
@ -129,8 +130,14 @@ static void devm_memremap_pages_release(void *data)
untrack_pfn(NULL, PHYS_PFN(res->start), resource_size(res));
pgmap_array_delete(res);
dev_WARN_ONCE(dev, pgmap->altmap.alloc,
"%s: failed to free all reserved pages\n", __func__);
WARN_ONCE(pgmap->altmap.alloc, "failed to free all reserved pages\n");
devmap_managed_enable_put();
}
EXPORT_SYMBOL_GPL(memunmap_pages);
static void devm_memremap_pages_release(void *data)
{
memunmap_pages(data);
}
static void dev_pagemap_percpu_release(struct percpu_ref *ref)
@ -141,27 +148,12 @@ static void dev_pagemap_percpu_release(struct percpu_ref *ref)
complete(&pgmap->done);
}
/**
* devm_memremap_pages - remap and provide memmap backing for the given resource
* @dev: hosting device for @res
* @pgmap: pointer to a struct dev_pagemap
*
* Notes:
* 1/ At a minimum the res and type members of @pgmap must be initialized
* by the caller before passing it to this function
*
* 2/ The altmap field may optionally be initialized, in which case
* PGMAP_ALTMAP_VALID must be set in pgmap->flags.
*
* 3/ The ref field may optionally be provided, in which pgmap->ref must be
* 'live' on entry and will be killed and reaped at
* devm_memremap_pages_release() time, or if this routine fails.
*
* 4/ res is expected to be a host memory range that could feasibly be
* treated as a "System RAM" range, i.e. not a device mmio range, but
* this is not enforced.
/*
* Not device managed version of dev_memremap_pages, undone by
* memunmap_pages(). Please use dev_memremap_pages if you have a struct
* device available.
*/
void *devm_memremap_pages(struct device *dev, struct dev_pagemap *pgmap)
void *memremap_pages(struct dev_pagemap *pgmap, int nid)
{
struct resource *res = &pgmap->res;
struct dev_pagemap *conflict_pgmap;
@ -172,7 +164,7 @@ void *devm_memremap_pages(struct device *dev, struct dev_pagemap *pgmap)
.altmap = pgmap_altmap(pgmap),
};
pgprot_t pgprot = PAGE_KERNEL;
int error, nid, is_ram;
int error, is_ram;
bool need_devmap_managed = true;
switch (pgmap->type) {
@ -220,14 +212,14 @@ void *devm_memremap_pages(struct device *dev, struct dev_pagemap *pgmap)
}
if (need_devmap_managed) {
error = devmap_managed_enable_get(dev, pgmap);
error = devmap_managed_enable_get(pgmap);
if (error)
return ERR_PTR(error);
}
conflict_pgmap = get_dev_pagemap(PHYS_PFN(res->start), NULL);
if (conflict_pgmap) {
dev_WARN(dev, "Conflicting mapping in same section\n");
WARN(1, "Conflicting mapping in same section\n");
put_dev_pagemap(conflict_pgmap);
error = -ENOMEM;
goto err_array;
@ -235,7 +227,7 @@ void *devm_memremap_pages(struct device *dev, struct dev_pagemap *pgmap)
conflict_pgmap = get_dev_pagemap(PHYS_PFN(res->end), NULL);
if (conflict_pgmap) {
dev_WARN(dev, "Conflicting mapping in same section\n");
WARN(1, "Conflicting mapping in same section\n");
put_dev_pagemap(conflict_pgmap);
error = -ENOMEM;
goto err_array;
@ -251,14 +243,11 @@ void *devm_memremap_pages(struct device *dev, struct dev_pagemap *pgmap)
goto err_array;
}
pgmap->dev = dev;
error = xa_err(xa_store_range(&pgmap_array, PHYS_PFN(res->start),
PHYS_PFN(res->end), pgmap, GFP_KERNEL));
if (error)
goto err_array;
nid = dev_to_node(dev);
if (nid < 0)
nid = numa_mem_id();
@ -314,12 +303,6 @@ void *devm_memremap_pages(struct device *dev, struct dev_pagemap *pgmap)
PHYS_PFN(res->start),
PHYS_PFN(resource_size(res)), pgmap);
percpu_ref_get_many(pgmap->ref, pfn_end(pgmap) - pfn_first(pgmap));
error = devm_add_action_or_reset(dev, devm_memremap_pages_release,
pgmap);
if (error)
return ERR_PTR(error);
return __va(res->start);
err_add_memory:
@ -331,8 +314,46 @@ void *devm_memremap_pages(struct device *dev, struct dev_pagemap *pgmap)
err_array:
dev_pagemap_kill(pgmap);
dev_pagemap_cleanup(pgmap);
devmap_managed_enable_put();
return ERR_PTR(error);
}
EXPORT_SYMBOL_GPL(memremap_pages);
/**
* devm_memremap_pages - remap and provide memmap backing for the given resource
* @dev: hosting device for @res
* @pgmap: pointer to a struct dev_pagemap
*
* Notes:
* 1/ At a minimum the res and type members of @pgmap must be initialized
* by the caller before passing it to this function
*
* 2/ The altmap field may optionally be initialized, in which case
* PGMAP_ALTMAP_VALID must be set in pgmap->flags.
*
* 3/ The ref field may optionally be provided, in which pgmap->ref must be
* 'live' on entry and will be killed and reaped at
* devm_memremap_pages_release() time, or if this routine fails.
*
* 4/ res is expected to be a host memory range that could feasibly be
* treated as a "System RAM" range, i.e. not a device mmio range, but
* this is not enforced.
*/
void *devm_memremap_pages(struct device *dev, struct dev_pagemap *pgmap)
{
int error;
void *ret;
ret = memremap_pages(pgmap, dev_to_node(dev));
if (IS_ERR(ret))
return ret;
error = devm_add_action_or_reset(dev, devm_memremap_pages_release,
pgmap);
if (error)
return ERR_PTR(error);
return ret;
}
EXPORT_SYMBOL_GPL(devm_memremap_pages);
void devm_memunmap_pages(struct device *dev, struct dev_pagemap *pgmap)

276
mm/migrate.c
View File

@ -38,6 +38,7 @@
#include <linux/hugetlb.h>
#include <linux/hugetlb_cgroup.h>
#include <linux/gfp.h>
#include <linux/pagewalk.h>
#include <linux/pfn_t.h>
#include <linux/memremap.h>
#include <linux/userfaultfd_k.h>
@ -2119,17 +2120,7 @@ out_unlock:
#endif /* CONFIG_NUMA */
#if defined(CONFIG_MIGRATE_VMA_HELPER)
struct migrate_vma {
struct vm_area_struct *vma;
unsigned long *dst;
unsigned long *src;
unsigned long cpages;
unsigned long npages;
unsigned long start;
unsigned long end;
};
#ifdef CONFIG_DEVICE_PRIVATE
static int migrate_vma_collect_hole(unsigned long start,
unsigned long end,
struct mm_walk *walk)
@ -2249,8 +2240,8 @@ again:
goto next;
page = device_private_entry_to_page(entry);
mpfn = migrate_pfn(page_to_pfn(page))|
MIGRATE_PFN_DEVICE | MIGRATE_PFN_MIGRATE;
mpfn = migrate_pfn(page_to_pfn(page)) |
MIGRATE_PFN_MIGRATE;
if (is_write_device_private_entry(entry))
mpfn |= MIGRATE_PFN_WRITE;
} else {
@ -2329,6 +2320,11 @@ next:
return 0;
}
static const struct mm_walk_ops migrate_vma_walk_ops = {
.pmd_entry = migrate_vma_collect_pmd,
.pte_hole = migrate_vma_collect_hole,
};
/*
* migrate_vma_collect() - collect pages over a range of virtual addresses
* @migrate: migrate struct containing all migration information
@ -2340,21 +2336,15 @@ next:
static void migrate_vma_collect(struct migrate_vma *migrate)
{
struct mmu_notifier_range range;
struct mm_walk mm_walk = {
.pmd_entry = migrate_vma_collect_pmd,
.pte_hole = migrate_vma_collect_hole,
.vma = migrate->vma,
.mm = migrate->vma->vm_mm,
.private = migrate,
};
mmu_notifier_range_init(&range, MMU_NOTIFY_CLEAR, 0, NULL, mm_walk.mm,
migrate->start,
migrate->end);
mmu_notifier_range_init(&range, MMU_NOTIFY_CLEAR, 0, NULL,
migrate->vma->vm_mm, migrate->start, migrate->end);
mmu_notifier_invalidate_range_start(&range);
walk_page_range(migrate->start, migrate->end, &mm_walk);
mmu_notifier_invalidate_range_end(&range);
walk_page_range(migrate->vma->vm_mm, migrate->start, migrate->end,
&migrate_vma_walk_ops, migrate);
mmu_notifier_invalidate_range_end(&range);
migrate->end = migrate->start + (migrate->npages << PAGE_SHIFT);
}
@ -2577,6 +2567,110 @@ restore:
}
}
/**
* migrate_vma_setup() - prepare to migrate a range of memory
* @args: contains the vma, start, and and pfns arrays for the migration
*
* Returns: negative errno on failures, 0 when 0 or more pages were migrated
* without an error.
*
* Prepare to migrate a range of memory virtual address range by collecting all
* the pages backing each virtual address in the range, saving them inside the
* src array. Then lock those pages and unmap them. Once the pages are locked
* and unmapped, check whether each page is pinned or not. Pages that aren't
* pinned have the MIGRATE_PFN_MIGRATE flag set (by this function) in the
* corresponding src array entry. Then restores any pages that are pinned, by
* remapping and unlocking those pages.
*
* The caller should then allocate destination memory and copy source memory to
* it for all those entries (ie with MIGRATE_PFN_VALID and MIGRATE_PFN_MIGRATE
* flag set). Once these are allocated and copied, the caller must update each
* corresponding entry in the dst array with the pfn value of the destination
* page and with the MIGRATE_PFN_VALID and MIGRATE_PFN_LOCKED flags set
* (destination pages must have their struct pages locked, via lock_page()).
*
* Note that the caller does not have to migrate all the pages that are marked
* with MIGRATE_PFN_MIGRATE flag in src array unless this is a migration from
* device memory to system memory. If the caller cannot migrate a device page
* back to system memory, then it must return VM_FAULT_SIGBUS, which has severe
* consequences for the userspace process, so it must be avoided if at all
* possible.
*
* For empty entries inside CPU page table (pte_none() or pmd_none() is true) we
* do set MIGRATE_PFN_MIGRATE flag inside the corresponding source array thus
* allowing the caller to allocate device memory for those unback virtual
* address. For this the caller simply has to allocate device memory and
* properly set the destination entry like for regular migration. Note that
* this can still fails and thus inside the device driver must check if the
* migration was successful for those entries after calling migrate_vma_pages()
* just like for regular migration.
*
* After that, the callers must call migrate_vma_pages() to go over each entry
* in the src array that has the MIGRATE_PFN_VALID and MIGRATE_PFN_MIGRATE flag
* set. If the corresponding entry in dst array has MIGRATE_PFN_VALID flag set,
* then migrate_vma_pages() to migrate struct page information from the source
* struct page to the destination struct page. If it fails to migrate the
* struct page information, then it clears the MIGRATE_PFN_MIGRATE flag in the
* src array.
*
* At this point all successfully migrated pages have an entry in the src
* array with MIGRATE_PFN_VALID and MIGRATE_PFN_MIGRATE flag set and the dst
* array entry with MIGRATE_PFN_VALID flag set.
*
* Once migrate_vma_pages() returns the caller may inspect which pages were
* successfully migrated, and which were not. Successfully migrated pages will
* have the MIGRATE_PFN_MIGRATE flag set for their src array entry.
*
* It is safe to update device page table after migrate_vma_pages() because
* both destination and source page are still locked, and the mmap_sem is held
* in read mode (hence no one can unmap the range being migrated).
*
* Once the caller is done cleaning up things and updating its page table (if it
* chose to do so, this is not an obligation) it finally calls
* migrate_vma_finalize() to update the CPU page table to point to new pages
* for successfully migrated pages or otherwise restore the CPU page table to
* point to the original source pages.
*/
int migrate_vma_setup(struct migrate_vma *args)
{
long nr_pages = (args->end - args->start) >> PAGE_SHIFT;
args->start &= PAGE_MASK;
args->end &= PAGE_MASK;
if (!args->vma || is_vm_hugetlb_page(args->vma) ||
(args->vma->vm_flags & VM_SPECIAL) || vma_is_dax(args->vma))
return -EINVAL;
if (nr_pages <= 0)
return -EINVAL;
if (args->start < args->vma->vm_start ||
args->start >= args->vma->vm_end)
return -EINVAL;
if (args->end <= args->vma->vm_start || args->end > args->vma->vm_end)
return -EINVAL;
if (!args->src || !args->dst)
return -EINVAL;
memset(args->src, 0, sizeof(*args->src) * nr_pages);
args->cpages = 0;
args->npages = 0;
migrate_vma_collect(args);
if (args->cpages)
migrate_vma_prepare(args);
if (args->cpages)
migrate_vma_unmap(args);
/*
* At this point pages are locked and unmapped, and thus they have
* stable content and can safely be copied to destination memory that
* is allocated by the drivers.
*/
return 0;
}
EXPORT_SYMBOL(migrate_vma_setup);
static void migrate_vma_insert_page(struct migrate_vma *migrate,
unsigned long addr,
struct page *page,
@ -2708,7 +2802,7 @@ abort:
*src &= ~MIGRATE_PFN_MIGRATE;
}
/*
/**
* migrate_vma_pages() - migrate meta-data from src page to dst page
* @migrate: migrate struct containing all migration information
*
@ -2716,7 +2810,7 @@ abort:
* struct page. This effectively finishes the migration from source page to the
* destination page.
*/
static void migrate_vma_pages(struct migrate_vma *migrate)
void migrate_vma_pages(struct migrate_vma *migrate)
{
const unsigned long npages = migrate->npages;
const unsigned long start = migrate->start;
@ -2790,8 +2884,9 @@ static void migrate_vma_pages(struct migrate_vma *migrate)
if (notified)
mmu_notifier_invalidate_range_only_end(&range);
}
EXPORT_SYMBOL(migrate_vma_pages);
/*
/**
* migrate_vma_finalize() - restore CPU page table entry
* @migrate: migrate struct containing all migration information
*
@ -2802,7 +2897,7 @@ static void migrate_vma_pages(struct migrate_vma *migrate)
* This also unlocks the pages and puts them back on the lru, or drops the extra
* refcount, for device pages.
*/
static void migrate_vma_finalize(struct migrate_vma *migrate)
void migrate_vma_finalize(struct migrate_vma *migrate)
{
const unsigned long npages = migrate->npages;
unsigned long i;
@ -2845,124 +2940,5 @@ static void migrate_vma_finalize(struct migrate_vma *migrate)
}
}
}
/*
* migrate_vma() - migrate a range of memory inside vma
*
* @ops: migration callback for allocating destination memory and copying
* @vma: virtual memory area containing the range to be migrated
* @start: start address of the range to migrate (inclusive)
* @end: end address of the range to migrate (exclusive)
* @src: array of hmm_pfn_t containing source pfns
* @dst: array of hmm_pfn_t containing destination pfns
* @private: pointer passed back to each of the callback
* Returns: 0 on success, error code otherwise
*
* This function tries to migrate a range of memory virtual address range, using
* callbacks to allocate and copy memory from source to destination. First it
* collects all the pages backing each virtual address in the range, saving this
* inside the src array. Then it locks those pages and unmaps them. Once the pages
* are locked and unmapped, it checks whether each page is pinned or not. Pages
* that aren't pinned have the MIGRATE_PFN_MIGRATE flag set (by this function)
* in the corresponding src array entry. It then restores any pages that are
* pinned, by remapping and unlocking those pages.
*
* At this point it calls the alloc_and_copy() callback. For documentation on
* what is expected from that callback, see struct migrate_vma_ops comments in
* include/linux/migrate.h
*
* After the alloc_and_copy() callback, this function goes over each entry in
* the src array that has the MIGRATE_PFN_VALID and MIGRATE_PFN_MIGRATE flag
* set. If the corresponding entry in dst array has MIGRATE_PFN_VALID flag set,
* then the function tries to migrate struct page information from the source
* struct page to the destination struct page. If it fails to migrate the struct
* page information, then it clears the MIGRATE_PFN_MIGRATE flag in the src
* array.
*
* At this point all successfully migrated pages have an entry in the src
* array with MIGRATE_PFN_VALID and MIGRATE_PFN_MIGRATE flag set and the dst
* array entry with MIGRATE_PFN_VALID flag set.
*
* It then calls the finalize_and_map() callback. See comments for "struct
* migrate_vma_ops", in include/linux/migrate.h for details about
* finalize_and_map() behavior.
*
* After the finalize_and_map() callback, for successfully migrated pages, this
* function updates the CPU page table to point to new pages, otherwise it
* restores the CPU page table to point to the original source pages.
*
* Function returns 0 after the above steps, even if no pages were migrated
* (The function only returns an error if any of the arguments are invalid.)
*
* Both src and dst array must be big enough for (end - start) >> PAGE_SHIFT
* unsigned long entries.
*/
int migrate_vma(const struct migrate_vma_ops *ops,
struct vm_area_struct *vma,
unsigned long start,
unsigned long end,
unsigned long *src,
unsigned long *dst,
void *private)
{
struct migrate_vma migrate;
/* Sanity check the arguments */
start &= PAGE_MASK;
end &= PAGE_MASK;
if (!vma || is_vm_hugetlb_page(vma) || (vma->vm_flags & VM_SPECIAL) ||
vma_is_dax(vma))
return -EINVAL;
if (start < vma->vm_start || start >= vma->vm_end)
return -EINVAL;
if (end <= vma->vm_start || end > vma->vm_end)
return -EINVAL;
if (!ops || !src || !dst || start >= end)
return -EINVAL;
memset(src, 0, sizeof(*src) * ((end - start) >> PAGE_SHIFT));
migrate.src = src;
migrate.dst = dst;
migrate.start = start;
migrate.npages = 0;
migrate.cpages = 0;
migrate.end = end;
migrate.vma = vma;
/* Collect, and try to unmap source pages */
migrate_vma_collect(&migrate);
if (!migrate.cpages)
return 0;
/* Lock and isolate page */
migrate_vma_prepare(&migrate);
if (!migrate.cpages)
return 0;
/* Unmap pages */
migrate_vma_unmap(&migrate);
if (!migrate.cpages)
return 0;
/*
* At this point pages are locked and unmapped, and thus they have
* stable content and can safely be copied to destination memory that
* is allocated by the callback.
*
* Note that migration can fail in migrate_vma_struct_page() for each
* individual page.
*/
ops->alloc_and_copy(vma, src, dst, start, end, private);
/* This does the real migration of struct page */
migrate_vma_pages(&migrate);
ops->finalize_and_map(vma, src, dst, start, end, private);
/* Unlock and remap pages */
migrate_vma_finalize(&migrate);
return 0;
}
EXPORT_SYMBOL(migrate_vma);
#endif /* defined(MIGRATE_VMA_HELPER) */
EXPORT_SYMBOL(migrate_vma_finalize);
#endif /* CONFIG_DEVICE_PRIVATE */

17
mm/mincore.c
View File

@ -10,7 +10,7 @@
*/
#include <linux/pagemap.h>
#include <linux/gfp.h>
#include <linux/mm.h>
#include <linux/pagewalk.h>
#include <linux/mman.h>
#include <linux/syscalls.h>
#include <linux/swap.h>
@ -193,6 +193,12 @@ static inline bool can_do_mincore(struct vm_area_struct *vma)
inode_permission(file_inode(vma->vm_file), MAY_WRITE) == 0;
}
static const struct mm_walk_ops mincore_walk_ops = {
.pmd_entry = mincore_pte_range,
.pte_hole = mincore_unmapped_range,
.hugetlb_entry = mincore_hugetlb,
};
/*
* Do a chunk of "sys_mincore()". We've already checked
* all the arguments, we hold the mmap semaphore: we should
@ -203,12 +209,6 @@ static long do_mincore(unsigned long addr, unsigned long pages, unsigned char *v
struct vm_area_struct *vma;
unsigned long end;
int err;
struct mm_walk mincore_walk = {
.pmd_entry = mincore_pte_range,
.pte_hole = mincore_unmapped_range,
.hugetlb_entry = mincore_hugetlb,
.private = vec,
};
vma = find_vma(current->mm, addr);
if (!vma || addr < vma->vm_start)
@ -219,8 +219,7 @@ static long do_mincore(unsigned long addr, unsigned long pages, unsigned char *v
memset(vec, 1, pages);
return pages;
}
mincore_walk.mm = vma->vm_mm;
err = walk_page_range(addr, end, &mincore_walk);
err = walk_page_range(vma->vm_mm, addr, end, &mincore_walk_ops, vec);
if (err < 0)
return err;
return (end - addr) >> PAGE_SHIFT;

269
mm/mmu_notifier.c
View File

@ -21,17 +21,11 @@
/* global SRCU for all MMs */
DEFINE_STATIC_SRCU(srcu);
/*
* This function allows mmu_notifier::release callback to delay a call to
* a function that will free appropriate resources. The function must be
* quick and must not block.
*/
void mmu_notifier_call_srcu(struct rcu_head *rcu,
void (*func)(struct rcu_head *rcu))
{
call_srcu(&srcu, rcu, func);
}
EXPORT_SYMBOL_GPL(mmu_notifier_call_srcu);
#ifdef CONFIG_LOCKDEP
struct lockdep_map __mmu_notifier_invalidate_range_start_map = {
.name = "mmu_notifier_invalidate_range_start"
};
#endif
/*
* This function can't run concurrently against mmu_notifier_register
@ -174,11 +168,19 @@ int __mmu_notifier_invalidate_range_start(struct mmu_notifier_range *range)
id = srcu_read_lock(&srcu);
hlist_for_each_entry_rcu(mn, &range->mm->mmu_notifier_mm->list, hlist) {
if (mn->ops->invalidate_range_start) {
int _ret = mn->ops->invalidate_range_start(mn, range);
int _ret;
if (!mmu_notifier_range_blockable(range))
non_block_start();
_ret = mn->ops->invalidate_range_start(mn, range);
if (!mmu_notifier_range_blockable(range))
non_block_end();
if (_ret) {
pr_info("%pS callback failed with %d in %sblockable context.\n",
mn->ops->invalidate_range_start, _ret,
!mmu_notifier_range_blockable(range) ? "non-" : "");
WARN_ON(mmu_notifier_range_blockable(range) ||
ret != -EAGAIN);
ret = _ret;
}
}
@ -187,7 +189,6 @@ int __mmu_notifier_invalidate_range_start(struct mmu_notifier_range *range)
return ret;
}
EXPORT_SYMBOL_GPL(__mmu_notifier_invalidate_range_start);
void __mmu_notifier_invalidate_range_end(struct mmu_notifier_range *range,
bool only_end)
@ -195,6 +196,7 @@ void __mmu_notifier_invalidate_range_end(struct mmu_notifier_range *range,
struct mmu_notifier *mn;
int id;
lock_map_acquire(&__mmu_notifier_invalidate_range_start_map);
id = srcu_read_lock(&srcu);
hlist_for_each_entry_rcu(mn, &range->mm->mmu_notifier_mm->list, hlist) {
/*
@ -214,12 +216,17 @@ void __mmu_notifier_invalidate_range_end(struct mmu_notifier_range *range,
mn->ops->invalidate_range(mn, range->mm,
range->start,
range->end);
if (mn->ops->invalidate_range_end)
if (mn->ops->invalidate_range_end) {
if (!mmu_notifier_range_blockable(range))
non_block_start();
mn->ops->invalidate_range_end(mn, range);
if (!mmu_notifier_range_blockable(range))
non_block_end();
}
}
srcu_read_unlock(&srcu, id);
lock_map_release(&__mmu_notifier_invalidate_range_start_map);
}
EXPORT_SYMBOL_GPL(__mmu_notifier_invalidate_range_end);
void __mmu_notifier_invalidate_range(struct mm_struct *mm,
unsigned long start, unsigned long end)
@ -234,35 +241,49 @@ void __mmu_notifier_invalidate_range(struct mm_struct *mm,
}
srcu_read_unlock(&srcu, id);
}
EXPORT_SYMBOL_GPL(__mmu_notifier_invalidate_range);
static int do_mmu_notifier_register(struct mmu_notifier *mn,
struct mm_struct *mm,
int take_mmap_sem)
/*
* Same as mmu_notifier_register but here the caller must hold the
* mmap_sem in write mode.
*/
int __mmu_notifier_register(struct mmu_notifier *mn, struct mm_struct *mm)
{
struct mmu_notifier_mm *mmu_notifier_mm;
struct mmu_notifier_mm *mmu_notifier_mm = NULL;
int ret;
lockdep_assert_held_write(&mm->mmap_sem);
BUG_ON(atomic_read(&mm->mm_users) <= 0);
ret = -ENOMEM;
mmu_notifier_mm = kmalloc(sizeof(struct mmu_notifier_mm), GFP_KERNEL);
if (unlikely(!mmu_notifier_mm))
goto out;
if (IS_ENABLED(CONFIG_LOCKDEP)) {
fs_reclaim_acquire(GFP_KERNEL);
lock_map_acquire(&__mmu_notifier_invalidate_range_start_map);
lock_map_release(&__mmu_notifier_invalidate_range_start_map);
fs_reclaim_release(GFP_KERNEL);
}
mn->mm = mm;
mn->users = 1;
if (!mm->mmu_notifier_mm) {
/*
* kmalloc cannot be called under mm_take_all_locks(), but we
* know that mm->mmu_notifier_mm can't change while we hold
* the write side of the mmap_sem.
*/
mmu_notifier_mm =
kmalloc(sizeof(struct mmu_notifier_mm), GFP_KERNEL);
if (!mmu_notifier_mm)
return -ENOMEM;
INIT_HLIST_HEAD(&mmu_notifier_mm->list);
spin_lock_init(&mmu_notifier_mm->lock);
}
if (take_mmap_sem)
down_write(&mm->mmap_sem);
ret = mm_take_all_locks(mm);
if (unlikely(ret))
goto out_clean;
if (!mm_has_notifiers(mm)) {
INIT_HLIST_HEAD(&mmu_notifier_mm->list);
spin_lock_init(&mmu_notifier_mm->lock);
mm->mmu_notifier_mm = mmu_notifier_mm;
mmu_notifier_mm = NULL;
}
/* Pairs with the mmdrop in mmu_notifier_unregister_* */
mmgrab(mm);
/*
@ -273,48 +294,118 @@ static int do_mmu_notifier_register(struct mmu_notifier *mn,
* We can't race against any other mmu notifier method either
* thanks to mm_take_all_locks().
*/
if (mmu_notifier_mm)
mm->mmu_notifier_mm = mmu_notifier_mm;
spin_lock(&mm->mmu_notifier_mm->lock);
hlist_add_head_rcu(&mn->hlist, &mm->mmu_notifier_mm->list);
spin_unlock(&mm->mmu_notifier_mm->lock);
mm_drop_all_locks(mm);
out_clean:
if (take_mmap_sem)
up_write(&mm->mmap_sem);
kfree(mmu_notifier_mm);
out:
BUG_ON(atomic_read(&mm->mm_users) <= 0);
return 0;
out_clean:
kfree(mmu_notifier_mm);
return ret;
}
EXPORT_SYMBOL_GPL(__mmu_notifier_register);
/*
/**
* mmu_notifier_register - Register a notifier on a mm
* @mn: The notifier to attach
* @mm: The mm to attach the notifier to
*
* Must not hold mmap_sem nor any other VM related lock when calling
* this registration function. Must also ensure mm_users can't go down
* to zero while this runs to avoid races with mmu_notifier_release,
* so mm has to be current->mm or the mm should be pinned safely such
* as with get_task_mm(). If the mm is not current->mm, the mm_users
* pin should be released by calling mmput after mmu_notifier_register
* returns. mmu_notifier_unregister must be always called to
* unregister the notifier. mm_count is automatically pinned to allow
* mmu_notifier_unregister to safely run at any time later, before or
* after exit_mmap. ->release will always be called before exit_mmap
* frees the pages.
* returns.
*
* mmu_notifier_unregister() or mmu_notifier_put() must be always called to
* unregister the notifier.
*
* While the caller has a mmu_notifier get the mn->mm pointer will remain
* valid, and can be converted to an active mm pointer via mmget_not_zero().
*/
int mmu_notifier_register(struct mmu_notifier *mn, struct mm_struct *mm)
{
return do_mmu_notifier_register(mn, mm, 1);
int ret;
down_write(&mm->mmap_sem);
ret = __mmu_notifier_register(mn, mm);
up_write(&mm->mmap_sem);
return ret;
}
EXPORT_SYMBOL_GPL(mmu_notifier_register);
/*
* Same as mmu_notifier_register but here the caller must hold the
* mmap_sem in write mode.
*/
int __mmu_notifier_register(struct mmu_notifier *mn, struct mm_struct *mm)
static struct mmu_notifier *
find_get_mmu_notifier(struct mm_struct *mm, const struct mmu_notifier_ops *ops)
{
return do_mmu_notifier_register(mn, mm, 0);
struct mmu_notifier *mn;
spin_lock(&mm->mmu_notifier_mm->lock);
hlist_for_each_entry_rcu (mn, &mm->mmu_notifier_mm->list, hlist) {
if (mn->ops != ops)
continue;
if (likely(mn->users != UINT_MAX))
mn->users++;
else
mn = ERR_PTR(-EOVERFLOW);
spin_unlock(&mm->mmu_notifier_mm->lock);
return mn;
}
spin_unlock(&mm->mmu_notifier_mm->lock);
return NULL;
}
EXPORT_SYMBOL_GPL(__mmu_notifier_register);
/**
* mmu_notifier_get_locked - Return the single struct mmu_notifier for
* the mm & ops
* @ops: The operations struct being subscribe with
* @mm : The mm to attach notifiers too
*
* This function either allocates a new mmu_notifier via
* ops->alloc_notifier(), or returns an already existing notifier on the
* list. The value of the ops pointer is used to determine when two notifiers
* are the same.
*
* Each call to mmu_notifier_get() must be paired with a call to
* mmu_notifier_put(). The caller must hold the write side of mm->mmap_sem.
*
* While the caller has a mmu_notifier get the mm pointer will remain valid,
* and can be converted to an active mm pointer via mmget_not_zero().
*/
struct mmu_notifier *mmu_notifier_get_locked(const struct mmu_notifier_ops *ops,
struct mm_struct *mm)
{
struct mmu_notifier *mn;
int ret;
lockdep_assert_held_write(&mm->mmap_sem);
if (mm->mmu_notifier_mm) {
mn = find_get_mmu_notifier(mm, ops);
if (mn)
return mn;
}
mn = ops->alloc_notifier(mm);
if (IS_ERR(mn))
return mn;
mn->ops = ops;
ret = __mmu_notifier_register(mn, mm);
if (ret)
goto out_free;
return mn;
out_free:
mn->ops->free_notifier(mn);
return ERR_PTR(ret);
}
EXPORT_SYMBOL_GPL(mmu_notifier_get_locked);
/* this is called after the last mmu_notifier_unregister() returned */
void __mmu_notifier_mm_destroy(struct mm_struct *mm)
@ -375,24 +466,74 @@ void mmu_notifier_unregister(struct mmu_notifier *mn, struct mm_struct *mm)
}
EXPORT_SYMBOL_GPL(mmu_notifier_unregister);
/*
* Same as mmu_notifier_unregister but no callback and no srcu synchronization.
*/
void mmu_notifier_unregister_no_release(struct mmu_notifier *mn,
struct mm_struct *mm)
static void mmu_notifier_free_rcu(struct rcu_head *rcu)
{
struct mmu_notifier *mn = container_of(rcu, struct mmu_notifier, rcu);
struct mm_struct *mm = mn->mm;
mn->ops->free_notifier(mn);
/* Pairs with the get in __mmu_notifier_register() */
mmdrop(mm);
}
/**
* mmu_notifier_put - Release the reference on the notifier
* @mn: The notifier to act on
*
* This function must be paired with each mmu_notifier_get(), it releases the
* reference obtained by the get. If this is the last reference then process
* to free the notifier will be run asynchronously.
*
* Unlike mmu_notifier_unregister() the get/put flow only calls ops->release
* when the mm_struct is destroyed. Instead free_notifier is always called to
* release any resources held by the user.
*
* As ops->release is not guaranteed to be called, the user must ensure that
* all sptes are dropped, and no new sptes can be established before
* mmu_notifier_put() is called.
*
* This function can be called from the ops->release callback, however the
* caller must still ensure it is called pairwise with mmu_notifier_get().
*
* Modules calling this function must call mmu_notifier_synchronize() in
* their __exit functions to ensure the async work is completed.
*/
void mmu_notifier_put(struct mmu_notifier *mn)
{
struct mm_struct *mm = mn->mm;
spin_lock(&mm->mmu_notifier_mm->lock);
/*
* Can not use list_del_rcu() since __mmu_notifier_release
* can delete it before we hold the lock.
*/
if (WARN_ON(!mn->users) || --mn->users)
goto out_unlock;
hlist_del_init_rcu(&mn->hlist);
spin_unlock(&mm->mmu_notifier_mm->lock);
BUG_ON(atomic_read(&mm->mm_count) <= 0);
mmdrop(mm);
call_srcu(&srcu, &mn->rcu, mmu_notifier_free_rcu);
return;
out_unlock:
spin_unlock(&mm->mmu_notifier_mm->lock);
}
EXPORT_SYMBOL_GPL(mmu_notifier_unregister_no_release);
EXPORT_SYMBOL_GPL(mmu_notifier_put);
/**
* mmu_notifier_synchronize - Ensure all mmu_notifiers are freed
*
* This function ensures that all outstanding async SRU work from
* mmu_notifier_put() is completed. After it returns any mmu_notifier_ops
* associated with an unused mmu_notifier will no longer be called.
*
* Before using the caller must ensure that all of its mmu_notifiers have been
* fully released via mmu_notifier_put().
*
* Modules using the mmu_notifier_put() API should call this in their __exit
* function to avoid module unloading races.
*/
void mmu_notifier_synchronize(void)
{
synchronize_srcu(&srcu);
}
EXPORT_SYMBOL_GPL(mmu_notifier_synchronize);
bool
mmu_notifier_range_update_to_read_only(const struct mmu_notifier_range *range)

26
mm/mprotect.c
View File

@ -9,7 +9,7 @@
* (C) Copyright 2002 Red Hat Inc, All Rights Reserved
*/
#include <linux/mm.h>
#include <linux/pagewalk.h>
#include <linux/hugetlb.h>
#include <linux/shm.h>
#include <linux/mman.h>
@ -329,20 +329,11 @@ static int prot_none_test(unsigned long addr, unsigned long next,
return 0;
}
static int prot_none_walk(struct vm_area_struct *vma, unsigned long start,
unsigned long end, unsigned long newflags)
{
pgprot_t new_pgprot = vm_get_page_prot(newflags);
struct mm_walk prot_none_walk = {
.pte_entry = prot_none_pte_entry,
.hugetlb_entry = prot_none_hugetlb_entry,
.test_walk = prot_none_test,
.mm = current->mm,
.private = &new_pgprot,
};
return walk_page_range(start, end, &prot_none_walk);
}
static const struct mm_walk_ops prot_none_walk_ops = {
.pte_entry = prot_none_pte_entry,
.hugetlb_entry = prot_none_hugetlb_entry,
.test_walk = prot_none_test,
};
int
mprotect_fixup(struct vm_area_struct *vma, struct vm_area_struct **pprev,
@ -369,7 +360,10 @@ mprotect_fixup(struct vm_area_struct *vma, struct vm_area_struct **pprev,
if (arch_has_pfn_modify_check() &&
(vma->vm_flags & (VM_PFNMAP|VM_MIXEDMAP)) &&
(newflags & (VM_READ|VM_WRITE|VM_EXEC)) == 0) {
error = prot_none_walk(vma, start, end, newflags);
pgprot_t new_pgprot = vm_get_page_prot(newflags);
error = walk_page_range(current->mm, start, end,
&prot_none_walk_ops, &new_pgprot);
if (error)
return error;
}

2
mm/page_alloc.c
View File

@ -5971,7 +5971,7 @@ void __ref memmap_init_zone_device(struct zone *zone,
}
}
pr_info("%s initialised, %lu pages in %ums\n", dev_name(pgmap->dev),
pr_info("%s initialised %lu pages in %ums\n", __func__,
size, jiffies_to_msecs(jiffies - start));
}

126
mm/pagewalk.c
View File

@ -1,5 +1,5 @@
// SPDX-License-Identifier: GPL-2.0
#include <linux/mm.h>
#include <linux/pagewalk.h>
#include <linux/highmem.h>
#include <linux/sched.h>
#include <linux/hugetlb.h>
@ -9,10 +9,11 @@ static int walk_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end,
{
pte_t *pte;
int err = 0;
const struct mm_walk_ops *ops = walk->ops;
pte = pte_offset_map(pmd, addr);
for (;;) {
err = walk->pte_entry(pte, addr, addr + PAGE_SIZE, walk);
err = ops->pte_entry(pte, addr, addr + PAGE_SIZE, walk);
if (err)
break;
addr += PAGE_SIZE;
@ -30,6 +31,7 @@ static int walk_pmd_range(pud_t *pud, unsigned long addr, unsigned long end,
{
pmd_t *pmd;
unsigned long next;
const struct mm_walk_ops *ops = walk->ops;
int err = 0;
pmd = pmd_offset(pud, addr);
@ -37,8 +39,8 @@ static int walk_pmd_range(pud_t *pud, unsigned long addr, unsigned long end,
again:
next = pmd_addr_end(addr, end);
if (pmd_none(*pmd) || !walk->vma) {
if (walk->pte_hole)
err = walk->pte_hole(addr, next, walk);
if (ops->pte_hole)
err = ops->pte_hole(addr, next, walk);
if (err)
break;
continue;
@ -47,8 +49,8 @@ again:
* This implies that each ->pmd_entry() handler
* needs to know about pmd_trans_huge() pmds
*/
if (walk->pmd_entry)
err = walk->pmd_entry(pmd, addr, next, walk);
if (ops->pmd_entry)
err = ops->pmd_entry(pmd, addr, next, walk);
if (err)
break;
@ -56,7 +58,7 @@ again:
* Check this here so we only break down trans_huge
* pages when we _need_ to
*/
if (!walk->pte_entry)
if (!ops->pte_entry)
continue;
split_huge_pmd(walk->vma, pmd, addr);
@ -75,6 +77,7 @@ static int walk_pud_range(p4d_t *p4d, unsigned long addr, unsigned long end,
{
pud_t *pud;
unsigned long next;
const struct mm_walk_ops *ops = walk->ops;
int err = 0;
pud = pud_offset(p4d, addr);
@ -82,18 +85,18 @@ static int walk_pud_range(p4d_t *p4d, unsigned long addr, unsigned long end,
again:
next = pud_addr_end(addr, end);
if (pud_none(*pud) || !walk->vma) {
if (walk->pte_hole)
err = walk->pte_hole(addr, next, walk);
if (ops->pte_hole)
err = ops->pte_hole(addr, next, walk);
if (err)
break;
continue;
}
if (walk->pud_entry) {
if (ops->pud_entry) {
spinlock_t *ptl = pud_trans_huge_lock(pud, walk->vma);
if (ptl) {
err = walk->pud_entry(pud, addr, next, walk);
err = ops->pud_entry(pud, addr, next, walk);
spin_unlock(ptl);
if (err)
break;
@ -105,7 +108,7 @@ static int walk_pud_range(p4d_t *p4d, unsigned long addr, unsigned long end,
if (pud_none(*pud))
goto again;
if (walk->pmd_entry || walk->pte_entry)
if (ops->pmd_entry || ops->pte_entry)
err = walk_pmd_range(pud, addr, next, walk);
if (err)
break;
@ -119,19 +122,20 @@ static int walk_p4d_range(pgd_t *pgd, unsigned long addr, unsigned long end,
{
p4d_t *p4d;
unsigned long next;
const struct mm_walk_ops *ops = walk->ops;
int err = 0;
p4d = p4d_offset(pgd, addr);
do {
next = p4d_addr_end(addr, end);
if (p4d_none_or_clear_bad(p4d)) {
if (walk->pte_hole)
err = walk->pte_hole(addr, next, walk);
if (ops->pte_hole)
err = ops->pte_hole(addr, next, walk);
if (err)
break;
continue;
}
if (walk->pmd_entry || walk->pte_entry)
if (ops->pmd_entry || ops->pte_entry)
err = walk_pud_range(p4d, addr, next, walk);
if (err)
break;
@ -145,19 +149,20 @@ static int walk_pgd_range(unsigned long addr, unsigned long end,
{
pgd_t *pgd;
unsigned long next;
const struct mm_walk_ops *ops = walk->ops;
int err = 0;
pgd = pgd_offset(walk->mm, addr);
do {
next = pgd_addr_end(addr, end);
if (pgd_none_or_clear_bad(pgd)) {
if (walk->pte_hole)
err = walk->pte_hole(addr, next, walk);
if (ops->pte_hole)
err = ops->pte_hole(addr, next, walk);
if (err)
break;
continue;
}
if (walk->pmd_entry || walk->pte_entry)
if (ops->pmd_entry || ops->pte_entry)
err = walk_p4d_range(pgd, addr, next, walk);
if (err)
break;
@ -183,6 +188,7 @@ static int walk_hugetlb_range(unsigned long addr, unsigned long end,
unsigned long hmask = huge_page_mask(h);
unsigned long sz = huge_page_size(h);
pte_t *pte;
const struct mm_walk_ops *ops = walk->ops;
int err = 0;
do {
@ -190,9 +196,9 @@ static int walk_hugetlb_range(unsigned long addr, unsigned long end,
pte = huge_pte_offset(walk->mm, addr & hmask, sz);
if (pte)
err = walk->hugetlb_entry(pte, hmask, addr, next, walk);
else if (walk->pte_hole)
err = walk->pte_hole(addr, next, walk);
err = ops->hugetlb_entry(pte, hmask, addr, next, walk);
else if (ops->pte_hole)
err = ops->pte_hole(addr, next, walk);
if (err)
break;
@ -220,9 +226,10 @@ static int walk_page_test(unsigned long start, unsigned long end,
struct mm_walk *walk)
{
struct vm_area_struct *vma = walk->vma;
const struct mm_walk_ops *ops = walk->ops;
if (walk->test_walk)
return walk->test_walk(start, end, walk);
if (ops->test_walk)
return ops->test_walk(start, end, walk);
/*
* vma(VM_PFNMAP) doesn't have any valid struct pages behind VM_PFNMAP
@ -234,8 +241,8 @@ static int walk_page_test(unsigned long start, unsigned long end,
*/
if (vma->vm_flags & VM_PFNMAP) {
int err = 1;
if (walk->pte_hole)
err = walk->pte_hole(start, end, walk);
if (ops->pte_hole)
err = ops->pte_hole(start, end, walk);
return err ? err : 1;
}
return 0;
@ -248,7 +255,7 @@ static int __walk_page_range(unsigned long start, unsigned long end,
struct vm_area_struct *vma = walk->vma;
if (vma && is_vm_hugetlb_page(vma)) {
if (walk->hugetlb_entry)
if (walk->ops->hugetlb_entry)
err = walk_hugetlb_range(start, end, walk);
} else
err = walk_pgd_range(start, end, walk);
@ -258,11 +265,13 @@ static int __walk_page_range(unsigned long start, unsigned long end,
/**
* walk_page_range - walk page table with caller specific callbacks
* @start: start address of the virtual address range
* @end: end address of the virtual address range
* @walk: mm_walk structure defining the callbacks and the target address space
* @mm: mm_struct representing the target process of page table walk
* @start: start address of the virtual address range
* @end: end address of the virtual address range
* @ops: operation to call during the walk
* @private: private data for callbacks' usage
*
* Recursively walk the page table tree of the process represented by @walk->mm
* Recursively walk the page table tree of the process represented by @mm
* within the virtual address range [@start, @end). During walking, we can do
* some caller-specific works for each entry, by setting up pmd_entry(),
* pte_entry(), and/or hugetlb_entry(). If you don't set up for some of these
@ -278,47 +287,52 @@ static int __walk_page_range(unsigned long start, unsigned long end,
*
* Before starting to walk page table, some callers want to check whether
* they really want to walk over the current vma, typically by checking
* its vm_flags. walk_page_test() and @walk->test_walk() are used for this
* its vm_flags. walk_page_test() and @ops->test_walk() are used for this
* purpose.
*
* struct mm_walk keeps current values of some common data like vma and pmd,
* which are useful for the access from callbacks. If you want to pass some
* caller-specific data to callbacks, @walk->private should be helpful.
* caller-specific data to callbacks, @private should be helpful.
*
* Locking:
* Callers of walk_page_range() and walk_page_vma() should hold
* @walk->mm->mmap_sem, because these function traverse vma list and/or
* access to vma's data.
* Callers of walk_page_range() and walk_page_vma() should hold @mm->mmap_sem,
* because these function traverse vma list and/or access to vma's data.
*/
int walk_page_range(unsigned long start, unsigned long end,
struct mm_walk *walk)
int walk_page_range(struct mm_struct *mm, unsigned long start,
unsigned long end, const struct mm_walk_ops *ops,
void *private)
{
int err = 0;
unsigned long next;
struct vm_area_struct *vma;
struct mm_walk walk = {
.ops = ops,
.mm = mm,
.private = private,
};
if (start >= end)
return -EINVAL;
if (!walk->mm)
if (!walk.mm)
return -EINVAL;
VM_BUG_ON_MM(!rwsem_is_locked(&walk->mm->mmap_sem), walk->mm);
lockdep_assert_held(&walk.mm->mmap_sem);
vma = find_vma(walk->mm, start);
vma = find_vma(walk.mm, start);
do {
if (!vma) { /* after the last vma */
walk->vma = NULL;
walk.vma = NULL;
next = end;
} else if (start < vma->vm_start) { /* outside vma */
walk->vma = NULL;
walk.vma = NULL;
next = min(end, vma->vm_start);
} else { /* inside vma */
walk->vma = vma;
walk.vma = vma;
next = min(end, vma->vm_end);
vma = vma->vm_next;
err = walk_page_test(start, next, walk);
err = walk_page_test(start, next, &walk);
if (err > 0) {
/*
* positive return values are purely for
@ -331,28 +345,34 @@ int walk_page_range(unsigned long start, unsigned long end,
if (err < 0)
break;
}
if (walk->vma || walk->pte_hole)
err = __walk_page_range(start, next, walk);
if (walk.vma || walk.ops->pte_hole)
err = __walk_page_range(start, next, &walk);
if (err)
break;
} while (start = next, start < end);
return err;
}
int walk_page_vma(struct vm_area_struct *vma, struct mm_walk *walk)
int walk_page_vma(struct vm_area_struct *vma, const struct mm_walk_ops *ops,
void *private)
{
struct mm_walk walk = {
.ops = ops,
.mm = vma->vm_mm,
.vma = vma,
.private = private,
};
int err;
if (!walk->mm)
if (!walk.mm)
return -EINVAL;
VM_BUG_ON(!rwsem_is_locked(&walk->mm->mmap_sem));
VM_BUG_ON(!vma);
walk->vma = vma;
err = walk_page_test(vma->vm_start, vma->vm_end, walk);
lockdep_assert_held(&walk.mm->mmap_sem);
err = walk_page_test(vma->vm_start, vma->vm_end, &walk);
if (err > 0)
return 0;
if (err < 0)
return err;
return __walk_page_range(vma->vm_start, vma->vm_end, walk);
return __walk_page_range(vma->vm_start, vma->vm_end, &walk);
}

1
tools/testing/nvdimm/test/iomap.c
View File

@ -132,7 +132,6 @@ void *__wrap_devm_memremap_pages(struct device *dev, struct dev_pagemap *pgmap)
if (!nfit_res)
return devm_memremap_pages(dev, pgmap);
pgmap->dev = dev;
if (!pgmap->ref) {
if (pgmap->ops && (pgmap->ops->kill || pgmap->ops->cleanup))
return ERR_PTR(-EINVAL);