OpenCloudOS-Kernel/drivers/iommu/intel/pasid.c

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// SPDX-License-Identifier: GPL-2.0
/**
* intel-pasid.c - PASID idr, table and entry manipulation
*
* Copyright (C) 2018 Intel Corporation
*
* Author: Lu Baolu <baolu.lu@linux.intel.com>
*/
#define pr_fmt(fmt) "DMAR: " fmt
#include <linux/bitops.h>
#include <linux/cpufeature.h>
#include <linux/dmar.h>
#include <linux/intel-iommu.h>
#include <linux/iommu.h>
#include <linux/memory.h>
#include <linux/pci.h>
#include <linux/pci-ats.h>
#include <linux/spinlock.h>
#include "pasid.h"
/*
* Intel IOMMU system wide PASID name space:
*/
u32 intel_pasid_max_id = PASID_MAX;
int vcmd_alloc_pasid(struct intel_iommu *iommu, u32 *pasid)
{
unsigned long flags;
u8 status_code;
int ret = 0;
u64 res;
raw_spin_lock_irqsave(&iommu->register_lock, flags);
dmar_writeq(iommu->reg + DMAR_VCMD_REG, VCMD_CMD_ALLOC);
IOMMU_WAIT_OP(iommu, DMAR_VCRSP_REG, dmar_readq,
!(res & VCMD_VRSP_IP), res);
raw_spin_unlock_irqrestore(&iommu->register_lock, flags);
status_code = VCMD_VRSP_SC(res);
switch (status_code) {
case VCMD_VRSP_SC_SUCCESS:
*pasid = VCMD_VRSP_RESULT_PASID(res);
break;
case VCMD_VRSP_SC_NO_PASID_AVAIL:
pr_info("IOMMU: %s: No PASID available\n", iommu->name);
ret = -ENOSPC;
break;
default:
ret = -ENODEV;
pr_warn("IOMMU: %s: Unexpected error code %d\n",
iommu->name, status_code);
}
return ret;
}
void vcmd_free_pasid(struct intel_iommu *iommu, u32 pasid)
{
unsigned long flags;
u8 status_code;
u64 res;
raw_spin_lock_irqsave(&iommu->register_lock, flags);
dmar_writeq(iommu->reg + DMAR_VCMD_REG,
VCMD_CMD_OPERAND(pasid) | VCMD_CMD_FREE);
IOMMU_WAIT_OP(iommu, DMAR_VCRSP_REG, dmar_readq,
!(res & VCMD_VRSP_IP), res);
raw_spin_unlock_irqrestore(&iommu->register_lock, flags);
status_code = VCMD_VRSP_SC(res);
switch (status_code) {
case VCMD_VRSP_SC_SUCCESS:
break;
case VCMD_VRSP_SC_INVALID_PASID:
pr_info("IOMMU: %s: Invalid PASID\n", iommu->name);
break;
default:
pr_warn("IOMMU: %s: Unexpected error code %d\n",
iommu->name, status_code);
}
}
/*
* Per device pasid table management:
*/
static inline void
device_attach_pasid_table(struct device_domain_info *info,
struct pasid_table *pasid_table)
{
info->pasid_table = pasid_table;
list_add(&info->table, &pasid_table->dev);
}
static inline void
device_detach_pasid_table(struct device_domain_info *info,
struct pasid_table *pasid_table)
{
info->pasid_table = NULL;
list_del(&info->table);
}
struct pasid_table_opaque {
struct pasid_table **pasid_table;
int segment;
int bus;
int devfn;
};
static int search_pasid_table(struct device_domain_info *info, void *opaque)
{
struct pasid_table_opaque *data = opaque;
if (info->iommu->segment == data->segment &&
info->bus == data->bus &&
info->devfn == data->devfn &&
info->pasid_table) {
*data->pasid_table = info->pasid_table;
return 1;
}
return 0;
}
static int get_alias_pasid_table(struct pci_dev *pdev, u16 alias, void *opaque)
{
struct pasid_table_opaque *data = opaque;
data->segment = pci_domain_nr(pdev->bus);
data->bus = PCI_BUS_NUM(alias);
data->devfn = alias & 0xff;
return for_each_device_domain(&search_pasid_table, data);
}
/*
* Allocate a pasid table for @dev. It should be called in a
* single-thread context.
*/
int intel_pasid_alloc_table(struct device *dev)
{
struct device_domain_info *info;
struct pasid_table *pasid_table;
struct pasid_table_opaque data;
struct page *pages;
u32 max_pasid = 0;
int ret, order;
int size;
might_sleep();
info = get_domain_info(dev);
if (WARN_ON(!info || !dev_is_pci(dev) || info->pasid_table))
return -EINVAL;
/* DMA alias device already has a pasid table, use it: */
data.pasid_table = &pasid_table;
ret = pci_for_each_dma_alias(to_pci_dev(dev),
&get_alias_pasid_table, &data);
if (ret)
goto attach_out;
pasid_table = kzalloc(sizeof(*pasid_table), GFP_KERNEL);
if (!pasid_table)
return -ENOMEM;
INIT_LIST_HEAD(&pasid_table->dev);
if (info->pasid_supported)
max_pasid = min_t(u32, pci_max_pasids(to_pci_dev(dev)),
intel_pasid_max_id);
size = max_pasid >> (PASID_PDE_SHIFT - 3);
order = size ? get_order(size) : 0;
pages = alloc_pages_node(info->iommu->node,
GFP_KERNEL | __GFP_ZERO, order);
if (!pages) {
kfree(pasid_table);
return -ENOMEM;
}
pasid_table->table = page_address(pages);
pasid_table->order = order;
pasid_table->max_pasid = 1 << (order + PAGE_SHIFT + 3);
attach_out:
device_attach_pasid_table(info, pasid_table);
return 0;
}
void intel_pasid_free_table(struct device *dev)
{
struct device_domain_info *info;
struct pasid_table *pasid_table;
struct pasid_dir_entry *dir;
struct pasid_entry *table;
int i, max_pde;
info = get_domain_info(dev);
if (!info || !dev_is_pci(dev) || !info->pasid_table)
return;
pasid_table = info->pasid_table;
device_detach_pasid_table(info, pasid_table);
if (!list_empty(&pasid_table->dev))
return;
/* Free scalable mode PASID directory tables: */
dir = pasid_table->table;
max_pde = pasid_table->max_pasid >> PASID_PDE_SHIFT;
for (i = 0; i < max_pde; i++) {
table = get_pasid_table_from_pde(&dir[i]);
free_pgtable_page(table);
}
free_pages((unsigned long)pasid_table->table, pasid_table->order);
kfree(pasid_table);
}
struct pasid_table *intel_pasid_get_table(struct device *dev)
{
struct device_domain_info *info;
info = get_domain_info(dev);
if (!info)
return NULL;
return info->pasid_table;
}
static int intel_pasid_get_dev_max_id(struct device *dev)
{
struct device_domain_info *info;
info = get_domain_info(dev);
if (!info || !info->pasid_table)
return 0;
return info->pasid_table->max_pasid;
}
static struct pasid_entry *intel_pasid_get_entry(struct device *dev, u32 pasid)
{
struct device_domain_info *info;
struct pasid_table *pasid_table;
struct pasid_dir_entry *dir;
struct pasid_entry *entries;
int dir_index, index;
pasid_table = intel_pasid_get_table(dev);
if (WARN_ON(!pasid_table || pasid >= intel_pasid_get_dev_max_id(dev)))
return NULL;
dir = pasid_table->table;
info = get_domain_info(dev);
dir_index = pasid >> PASID_PDE_SHIFT;
index = pasid & PASID_PTE_MASK;
iommu/vt-d: Fix lockdep splat in intel_pasid_get_entry() The pasid_lock is used to synchronize different threads from modifying a same pasid directory entry at the same time. It causes below lockdep splat. [ 83.296538] ======================================================== [ 83.296538] WARNING: possible irq lock inversion dependency detected [ 83.296539] 5.12.0-rc3+ #25 Tainted: G W [ 83.296539] -------------------------------------------------------- [ 83.296540] bash/780 just changed the state of lock: [ 83.296540] ffffffff82b29c98 (device_domain_lock){..-.}-{2:2}, at: iommu_flush_dev_iotlb.part.0+0x32/0x110 [ 83.296547] but this lock took another, SOFTIRQ-unsafe lock in the past: [ 83.296547] (pasid_lock){+.+.}-{2:2} [ 83.296548] and interrupts could create inverse lock ordering between them. [ 83.296549] other info that might help us debug this: [ 83.296549] Chain exists of: device_domain_lock --> &iommu->lock --> pasid_lock [ 83.296551] Possible interrupt unsafe locking scenario: [ 83.296551] CPU0 CPU1 [ 83.296552] ---- ---- [ 83.296552] lock(pasid_lock); [ 83.296553] local_irq_disable(); [ 83.296553] lock(device_domain_lock); [ 83.296554] lock(&iommu->lock); [ 83.296554] <Interrupt> [ 83.296554] lock(device_domain_lock); [ 83.296555] *** DEADLOCK *** Fix it by replacing the pasid_lock with an atomic exchange operation. Reported-and-tested-by: Dave Jiang <dave.jiang@intel.com> Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com> Link: https://lore.kernel.org/r/20210320020916.640115-1-baolu.lu@linux.intel.com Signed-off-by: Joerg Roedel <jroedel@suse.de>
2021-03-20 10:09:16 +08:00
retry:
entries = get_pasid_table_from_pde(&dir[dir_index]);
if (!entries) {
entries = alloc_pgtable_page(info->iommu->node);
iommu/vt-d: Fix lockdep splat in intel_pasid_get_entry() The pasid_lock is used to synchronize different threads from modifying a same pasid directory entry at the same time. It causes below lockdep splat. [ 83.296538] ======================================================== [ 83.296538] WARNING: possible irq lock inversion dependency detected [ 83.296539] 5.12.0-rc3+ #25 Tainted: G W [ 83.296539] -------------------------------------------------------- [ 83.296540] bash/780 just changed the state of lock: [ 83.296540] ffffffff82b29c98 (device_domain_lock){..-.}-{2:2}, at: iommu_flush_dev_iotlb.part.0+0x32/0x110 [ 83.296547] but this lock took another, SOFTIRQ-unsafe lock in the past: [ 83.296547] (pasid_lock){+.+.}-{2:2} [ 83.296548] and interrupts could create inverse lock ordering between them. [ 83.296549] other info that might help us debug this: [ 83.296549] Chain exists of: device_domain_lock --> &iommu->lock --> pasid_lock [ 83.296551] Possible interrupt unsafe locking scenario: [ 83.296551] CPU0 CPU1 [ 83.296552] ---- ---- [ 83.296552] lock(pasid_lock); [ 83.296553] local_irq_disable(); [ 83.296553] lock(device_domain_lock); [ 83.296554] lock(&iommu->lock); [ 83.296554] <Interrupt> [ 83.296554] lock(device_domain_lock); [ 83.296555] *** DEADLOCK *** Fix it by replacing the pasid_lock with an atomic exchange operation. Reported-and-tested-by: Dave Jiang <dave.jiang@intel.com> Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com> Link: https://lore.kernel.org/r/20210320020916.640115-1-baolu.lu@linux.intel.com Signed-off-by: Joerg Roedel <jroedel@suse.de>
2021-03-20 10:09:16 +08:00
if (!entries)
return NULL;
iommu/vt-d: Fix lockdep splat in intel_pasid_get_entry() The pasid_lock is used to synchronize different threads from modifying a same pasid directory entry at the same time. It causes below lockdep splat. [ 83.296538] ======================================================== [ 83.296538] WARNING: possible irq lock inversion dependency detected [ 83.296539] 5.12.0-rc3+ #25 Tainted: G W [ 83.296539] -------------------------------------------------------- [ 83.296540] bash/780 just changed the state of lock: [ 83.296540] ffffffff82b29c98 (device_domain_lock){..-.}-{2:2}, at: iommu_flush_dev_iotlb.part.0+0x32/0x110 [ 83.296547] but this lock took another, SOFTIRQ-unsafe lock in the past: [ 83.296547] (pasid_lock){+.+.}-{2:2} [ 83.296548] and interrupts could create inverse lock ordering between them. [ 83.296549] other info that might help us debug this: [ 83.296549] Chain exists of: device_domain_lock --> &iommu->lock --> pasid_lock [ 83.296551] Possible interrupt unsafe locking scenario: [ 83.296551] CPU0 CPU1 [ 83.296552] ---- ---- [ 83.296552] lock(pasid_lock); [ 83.296553] local_irq_disable(); [ 83.296553] lock(device_domain_lock); [ 83.296554] lock(&iommu->lock); [ 83.296554] <Interrupt> [ 83.296554] lock(device_domain_lock); [ 83.296555] *** DEADLOCK *** Fix it by replacing the pasid_lock with an atomic exchange operation. Reported-and-tested-by: Dave Jiang <dave.jiang@intel.com> Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com> Link: https://lore.kernel.org/r/20210320020916.640115-1-baolu.lu@linux.intel.com Signed-off-by: Joerg Roedel <jroedel@suse.de>
2021-03-20 10:09:16 +08:00
/*
* The pasid directory table entry won't be freed after
* allocation. No worry about the race with free and
* clear. However, this entry might be populated by others
* while we are preparing it. Use theirs with a retry.
*/
if (cmpxchg64(&dir[dir_index].val, 0ULL,
(u64)virt_to_phys(entries) | PASID_PTE_PRESENT)) {
free_pgtable_page(entries);
goto retry;
}
}
return &entries[index];
}
/*
* Interfaces for PASID table entry manipulation:
*/
static inline void pasid_clear_entry(struct pasid_entry *pe)
{
WRITE_ONCE(pe->val[0], 0);
WRITE_ONCE(pe->val[1], 0);
WRITE_ONCE(pe->val[2], 0);
WRITE_ONCE(pe->val[3], 0);
WRITE_ONCE(pe->val[4], 0);
WRITE_ONCE(pe->val[5], 0);
WRITE_ONCE(pe->val[6], 0);
WRITE_ONCE(pe->val[7], 0);
}
static inline void pasid_clear_entry_with_fpd(struct pasid_entry *pe)
{
WRITE_ONCE(pe->val[0], PASID_PTE_FPD);
WRITE_ONCE(pe->val[1], 0);
WRITE_ONCE(pe->val[2], 0);
WRITE_ONCE(pe->val[3], 0);
WRITE_ONCE(pe->val[4], 0);
WRITE_ONCE(pe->val[5], 0);
WRITE_ONCE(pe->val[6], 0);
WRITE_ONCE(pe->val[7], 0);
}
static void
intel_pasid_clear_entry(struct device *dev, u32 pasid, bool fault_ignore)
{
struct pasid_entry *pe;
pe = intel_pasid_get_entry(dev, pasid);
if (WARN_ON(!pe))
return;
if (fault_ignore && pasid_pte_is_present(pe))
pasid_clear_entry_with_fpd(pe);
else
pasid_clear_entry(pe);
}
static inline void pasid_set_bits(u64 *ptr, u64 mask, u64 bits)
{
u64 old;
old = READ_ONCE(*ptr);
WRITE_ONCE(*ptr, (old & ~mask) | bits);
}
/*
* Setup the DID(Domain Identifier) field (Bit 64~79) of scalable mode
* PASID entry.
*/
static inline void
pasid_set_domain_id(struct pasid_entry *pe, u64 value)
{
pasid_set_bits(&pe->val[1], GENMASK_ULL(15, 0), value);
}
/*
* Get domain ID value of a scalable mode PASID entry.
*/
static inline u16
pasid_get_domain_id(struct pasid_entry *pe)
{
return (u16)(READ_ONCE(pe->val[1]) & GENMASK_ULL(15, 0));
}
/*
* Setup the SLPTPTR(Second Level Page Table Pointer) field (Bit 12~63)
* of a scalable mode PASID entry.
*/
static inline void
pasid_set_slptr(struct pasid_entry *pe, u64 value)
{
pasid_set_bits(&pe->val[0], VTD_PAGE_MASK, value);
}
/*
* Setup the AW(Address Width) field (Bit 2~4) of a scalable mode PASID
* entry.
*/
static inline void
pasid_set_address_width(struct pasid_entry *pe, u64 value)
{
pasid_set_bits(&pe->val[0], GENMASK_ULL(4, 2), value << 2);
}
/*
* Setup the PGTT(PASID Granular Translation Type) field (Bit 6~8)
* of a scalable mode PASID entry.
*/
static inline void
pasid_set_translation_type(struct pasid_entry *pe, u64 value)
{
pasid_set_bits(&pe->val[0], GENMASK_ULL(8, 6), value << 6);
}
/*
* Enable fault processing by clearing the FPD(Fault Processing
* Disable) field (Bit 1) of a scalable mode PASID entry.
*/
static inline void pasid_set_fault_enable(struct pasid_entry *pe)
{
pasid_set_bits(&pe->val[0], 1 << 1, 0);
}
/*
* Setup the SRE(Supervisor Request Enable) field (Bit 128) of a
* scalable mode PASID entry.
*/
static inline void pasid_set_sre(struct pasid_entry *pe)
{
pasid_set_bits(&pe->val[2], 1 << 0, 1);
}
/*
* Setup the WPE(Write Protect Enable) field (Bit 132) of a
* scalable mode PASID entry.
*/
static inline void pasid_set_wpe(struct pasid_entry *pe)
{
pasid_set_bits(&pe->val[2], 1 << 4, 1 << 4);
}
/*
* Setup the P(Present) field (Bit 0) of a scalable mode PASID
* entry.
*/
static inline void pasid_set_present(struct pasid_entry *pe)
{
pasid_set_bits(&pe->val[0], 1 << 0, 1);
}
/*
* Setup Page Walk Snoop bit (Bit 87) of a scalable mode PASID
* entry.
*/
static inline void pasid_set_page_snoop(struct pasid_entry *pe, bool value)
{
pasid_set_bits(&pe->val[1], 1 << 23, value << 23);
}
/*
* Setup the Page Snoop (PGSNP) field (Bit 88) of a scalable mode
* PASID entry.
*/
static inline void
pasid_set_pgsnp(struct pasid_entry *pe)
{
pasid_set_bits(&pe->val[1], 1ULL << 24, 1ULL << 24);
}
/*
* Setup the First Level Page table Pointer field (Bit 140~191)
* of a scalable mode PASID entry.
*/
static inline void
pasid_set_flptr(struct pasid_entry *pe, u64 value)
{
pasid_set_bits(&pe->val[2], VTD_PAGE_MASK, value);
}
/*
* Setup the First Level Paging Mode field (Bit 130~131) of a
* scalable mode PASID entry.
*/
static inline void
pasid_set_flpm(struct pasid_entry *pe, u64 value)
{
pasid_set_bits(&pe->val[2], GENMASK_ULL(3, 2), value << 2);
}
/*
* Setup the Extended Access Flag Enable (EAFE) field (Bit 135)
* of a scalable mode PASID entry.
*/
static inline void
pasid_set_eafe(struct pasid_entry *pe)
{
pasid_set_bits(&pe->val[2], 1 << 7, 1 << 7);
}
static void
pasid_cache_invalidation_with_pasid(struct intel_iommu *iommu,
u16 did, u32 pasid)
{
struct qi_desc desc;
desc.qw0 = QI_PC_DID(did) | QI_PC_GRAN(QI_PC_PASID_SEL) |
QI_PC_PASID(pasid) | QI_PC_TYPE;
desc.qw1 = 0;
desc.qw2 = 0;
desc.qw3 = 0;
qi_submit_sync(iommu, &desc, 1, 0);
}
static void
devtlb_invalidation_with_pasid(struct intel_iommu *iommu,
struct device *dev, u32 pasid)
{
struct device_domain_info *info;
u16 sid, qdep, pfsid;
info = get_domain_info(dev);
if (!info || !info->ats_enabled)
return;
sid = info->bus << 8 | info->devfn;
qdep = info->ats_qdep;
pfsid = info->pfsid;
/*
* When PASID 0 is used, it indicates RID2PASID(DMA request w/o PASID),
* devTLB flush w/o PASID should be used. For non-zero PASID under
* SVA usage, device could do DMA with multiple PASIDs. It is more
* efficient to flush devTLB specific to the PASID.
*/
if (pasid == PASID_RID2PASID)
qi_flush_dev_iotlb(iommu, sid, pfsid, qdep, 0, 64 - VTD_PAGE_SHIFT);
else
qi_flush_dev_iotlb_pasid(iommu, sid, pfsid, pasid, qdep, 0, 64 - VTD_PAGE_SHIFT);
}
void intel_pasid_tear_down_entry(struct intel_iommu *iommu, struct device *dev,
u32 pasid, bool fault_ignore)
{
struct pasid_entry *pte;
u16 did;
pte = intel_pasid_get_entry(dev, pasid);
if (WARN_ON(!pte))
return;
if (!(pte->val[0] & PASID_PTE_PRESENT))
return;
did = pasid_get_domain_id(pte);
intel_pasid_clear_entry(dev, pasid, fault_ignore);
if (!ecap_coherent(iommu->ecap))
clflush_cache_range(pte, sizeof(*pte));
pasid_cache_invalidation_with_pasid(iommu, did, pasid);
qi_flush_piotlb(iommu, did, pasid, 0, -1, 0);
/* Device IOTLB doesn't need to be flushed in caching mode. */
if (!cap_caching_mode(iommu->cap))
devtlb_invalidation_with_pasid(iommu, dev, pasid);
}
static void pasid_flush_caches(struct intel_iommu *iommu,
struct pasid_entry *pte,
u32 pasid, u16 did)
{
if (!ecap_coherent(iommu->ecap))
clflush_cache_range(pte, sizeof(*pte));
if (cap_caching_mode(iommu->cap)) {
pasid_cache_invalidation_with_pasid(iommu, did, pasid);
qi_flush_piotlb(iommu, did, pasid, 0, -1, 0);
} else {
iommu_flush_write_buffer(iommu);
}
}
static inline int pasid_enable_wpe(struct pasid_entry *pte)
{
iommu/vt-d: Fix build error of pasid_enable_wpe() with !X86 Commit f68c7f539b6e9 ("iommu/vt-d: Enable write protect for supervisor SVM") added pasid_enable_wpe() which hit below compile error with !X86. ../drivers/iommu/intel/pasid.c: In function 'pasid_enable_wpe': ../drivers/iommu/intel/pasid.c:554:22: error: implicit declaration of function 'read_cr0' [-Werror=implicit-function-declaration] 554 | unsigned long cr0 = read_cr0(); | ^~~~~~~~ In file included from ../include/linux/build_bug.h:5, from ../include/linux/bits.h:22, from ../include/linux/bitops.h:6, from ../drivers/iommu/intel/pasid.c:12: ../drivers/iommu/intel/pasid.c:557:23: error: 'X86_CR0_WP' undeclared (first use in this function) 557 | if (unlikely(!(cr0 & X86_CR0_WP))) { | ^~~~~~~~~~ ../include/linux/compiler.h:78:42: note: in definition of macro 'unlikely' 78 | # define unlikely(x) __builtin_expect(!!(x), 0) | ^ ../drivers/iommu/intel/pasid.c:557:23: note: each undeclared identifier is reported only once for each function it appears in 557 | if (unlikely(!(cr0 & X86_CR0_WP))) { | ^~~~~~~~~~ ../include/linux/compiler.h:78:42: note: in definition of macro 'unlikely' 78 | # define unlikely(x) __builtin_expect(!!(x), 0) | Add the missing dependency. Cc: Sanjay Kumar <sanjay.k.kumar@intel.com> Cc: Jacob Pan <jacob.jun.pan@linux.intel.com> Cc: Randy Dunlap <rdunlap@infradead.org> Reported-by: kernel test robot <lkp@intel.com> Reported-by: Randy Dunlap <rdunlap@infradead.org> Fixes: f68c7f539b6e9 ("iommu/vt-d: Enable write protect for supervisor SVM") Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com> Acked-by: Randy Dunlap <rdunlap@infradead.org> # build-tested Link: https://lore.kernel.org/r/20210411062312.3057579-1-baolu.lu@linux.intel.com Signed-off-by: Joerg Roedel <jroedel@suse.de>
2021-04-11 14:23:12 +08:00
#ifdef CONFIG_X86
unsigned long cr0 = read_cr0();
/* CR0.WP is normally set but just to be sure */
if (unlikely(!(cr0 & X86_CR0_WP))) {
pr_err_ratelimited("No CPU write protect!\n");
return -EINVAL;
}
iommu/vt-d: Fix build error of pasid_enable_wpe() with !X86 Commit f68c7f539b6e9 ("iommu/vt-d: Enable write protect for supervisor SVM") added pasid_enable_wpe() which hit below compile error with !X86. ../drivers/iommu/intel/pasid.c: In function 'pasid_enable_wpe': ../drivers/iommu/intel/pasid.c:554:22: error: implicit declaration of function 'read_cr0' [-Werror=implicit-function-declaration] 554 | unsigned long cr0 = read_cr0(); | ^~~~~~~~ In file included from ../include/linux/build_bug.h:5, from ../include/linux/bits.h:22, from ../include/linux/bitops.h:6, from ../drivers/iommu/intel/pasid.c:12: ../drivers/iommu/intel/pasid.c:557:23: error: 'X86_CR0_WP' undeclared (first use in this function) 557 | if (unlikely(!(cr0 & X86_CR0_WP))) { | ^~~~~~~~~~ ../include/linux/compiler.h:78:42: note: in definition of macro 'unlikely' 78 | # define unlikely(x) __builtin_expect(!!(x), 0) | ^ ../drivers/iommu/intel/pasid.c:557:23: note: each undeclared identifier is reported only once for each function it appears in 557 | if (unlikely(!(cr0 & X86_CR0_WP))) { | ^~~~~~~~~~ ../include/linux/compiler.h:78:42: note: in definition of macro 'unlikely' 78 | # define unlikely(x) __builtin_expect(!!(x), 0) | Add the missing dependency. Cc: Sanjay Kumar <sanjay.k.kumar@intel.com> Cc: Jacob Pan <jacob.jun.pan@linux.intel.com> Cc: Randy Dunlap <rdunlap@infradead.org> Reported-by: kernel test robot <lkp@intel.com> Reported-by: Randy Dunlap <rdunlap@infradead.org> Fixes: f68c7f539b6e9 ("iommu/vt-d: Enable write protect for supervisor SVM") Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com> Acked-by: Randy Dunlap <rdunlap@infradead.org> # build-tested Link: https://lore.kernel.org/r/20210411062312.3057579-1-baolu.lu@linux.intel.com Signed-off-by: Joerg Roedel <jroedel@suse.de>
2021-04-11 14:23:12 +08:00
#endif
pasid_set_wpe(pte);
return 0;
};
/*
* Set up the scalable mode pasid table entry for first only
* translation type.
*/
int intel_pasid_setup_first_level(struct intel_iommu *iommu,
struct device *dev, pgd_t *pgd,
u32 pasid, u16 did, int flags)
{
struct pasid_entry *pte;
if (!ecap_flts(iommu->ecap)) {
pr_err("No first level translation support on %s\n",
iommu->name);
return -EINVAL;
}
pte = intel_pasid_get_entry(dev, pasid);
if (WARN_ON(!pte))
return -EINVAL;
pasid_clear_entry(pte);
/* Setup the first level page table pointer: */
pasid_set_flptr(pte, (u64)__pa(pgd));
if (flags & PASID_FLAG_SUPERVISOR_MODE) {
if (!ecap_srs(iommu->ecap)) {
pr_err("No supervisor request support on %s\n",
iommu->name);
return -EINVAL;
}
pasid_set_sre(pte);
if (pasid_enable_wpe(pte))
return -EINVAL;
}
if (flags & PASID_FLAG_FL5LP) {
if (cap_5lp_support(iommu->cap)) {
pasid_set_flpm(pte, 1);
} else {
pr_err("No 5-level paging support for first-level\n");
pasid_clear_entry(pte);
return -EINVAL;
}
}
if (flags & PASID_FLAG_PAGE_SNOOP)
pasid_set_pgsnp(pte);
pasid_set_domain_id(pte, did);
pasid_set_address_width(pte, iommu->agaw);
pasid_set_page_snoop(pte, !!ecap_smpwc(iommu->ecap));
/* Setup Present and PASID Granular Transfer Type: */
pasid_set_translation_type(pte, PASID_ENTRY_PGTT_FL_ONLY);
pasid_set_present(pte);
pasid_flush_caches(iommu, pte, pasid, did);
return 0;
}
/*
* Skip top levels of page tables for iommu which has less agaw
* than default. Unnecessary for PT mode.
*/
static inline int iommu_skip_agaw(struct dmar_domain *domain,
struct intel_iommu *iommu,
struct dma_pte **pgd)
{
int agaw;
for (agaw = domain->agaw; agaw > iommu->agaw; agaw--) {
*pgd = phys_to_virt(dma_pte_addr(*pgd));
if (!dma_pte_present(*pgd))
return -EINVAL;
}
return agaw;
}
/*
* Set up the scalable mode pasid entry for second only translation type.
*/
int intel_pasid_setup_second_level(struct intel_iommu *iommu,
struct dmar_domain *domain,
struct device *dev, u32 pasid)
{
struct pasid_entry *pte;
struct dma_pte *pgd;
u64 pgd_val;
int agaw;
u16 did;
/*
* If hardware advertises no support for second level
* translation, return directly.
*/
if (!ecap_slts(iommu->ecap)) {
pr_err("No second level translation support on %s\n",
iommu->name);
return -EINVAL;
}
pgd = domain->pgd;
agaw = iommu_skip_agaw(domain, iommu, &pgd);
if (agaw < 0) {
dev_err(dev, "Invalid domain page table\n");
return -EINVAL;
}
pgd_val = virt_to_phys(pgd);
did = domain->iommu_did[iommu->seq_id];
pte = intel_pasid_get_entry(dev, pasid);
if (!pte) {
dev_err(dev, "Failed to get pasid entry of PASID %d\n", pasid);
return -ENODEV;
}
pasid_clear_entry(pte);
pasid_set_domain_id(pte, did);
pasid_set_slptr(pte, pgd_val);
pasid_set_address_width(pte, agaw);
pasid_set_translation_type(pte, PASID_ENTRY_PGTT_SL_ONLY);
pasid_set_fault_enable(pte);
pasid_set_page_snoop(pte, !!ecap_smpwc(iommu->ecap));
if (domain->domain.type == IOMMU_DOMAIN_UNMANAGED)
pasid_set_pgsnp(pte);
/*
* Since it is a second level only translation setup, we should
* set SRE bit as well (addresses are expected to be GPAs).
*/
if (pasid != PASID_RID2PASID)
pasid_set_sre(pte);
pasid_set_present(pte);
pasid_flush_caches(iommu, pte, pasid, did);
return 0;
}
/*
* Set up the scalable mode pasid entry for passthrough translation type.
*/
int intel_pasid_setup_pass_through(struct intel_iommu *iommu,
struct dmar_domain *domain,
struct device *dev, u32 pasid)
{
u16 did = FLPT_DEFAULT_DID;
struct pasid_entry *pte;
pte = intel_pasid_get_entry(dev, pasid);
if (!pte) {
dev_err(dev, "Failed to get pasid entry of PASID %d\n", pasid);
return -ENODEV;
}
pasid_clear_entry(pte);
pasid_set_domain_id(pte, did);
pasid_set_address_width(pte, iommu->agaw);
pasid_set_translation_type(pte, PASID_ENTRY_PGTT_PT);
pasid_set_fault_enable(pte);
pasid_set_page_snoop(pte, !!ecap_smpwc(iommu->ecap));
/*
* We should set SRE bit as well since the addresses are expected
* to be GPAs.
*/
pasid_set_sre(pte);
pasid_set_present(pte);
pasid_flush_caches(iommu, pte, pasid, did);
return 0;
}
static int
intel_pasid_setup_bind_data(struct intel_iommu *iommu, struct pasid_entry *pte,
struct iommu_gpasid_bind_data_vtd *pasid_data)
{
/*
* Not all guest PASID table entry fields are passed down during bind,
* here we only set up the ones that are dependent on guest settings.
* Execution related bits such as NXE, SMEP are not supported.
* Other fields, such as snoop related, are set based on host needs
* regardless of guest settings.
*/
if (pasid_data->flags & IOMMU_SVA_VTD_GPASID_SRE) {
if (!ecap_srs(iommu->ecap)) {
pr_err_ratelimited("No supervisor request support on %s\n",
iommu->name);
return -EINVAL;
}
pasid_set_sre(pte);
/* Enable write protect WP if guest requested */
if (pasid_data->flags & IOMMU_SVA_VTD_GPASID_WPE)
pasid_set_wpe(pte);
}
if (pasid_data->flags & IOMMU_SVA_VTD_GPASID_EAFE) {
if (!ecap_eafs(iommu->ecap)) {
pr_err_ratelimited("No extended access flag support on %s\n",
iommu->name);
return -EINVAL;
}
pasid_set_eafe(pte);
}
/*
* Memory type is only applicable to devices inside processor coherent
* domain. Will add MTS support once coherent devices are available.
*/
if (pasid_data->flags & IOMMU_SVA_VTD_GPASID_MTS_MASK) {
pr_warn_ratelimited("No memory type support %s\n",
iommu->name);
return -EINVAL;
}
return 0;
}
/**
* intel_pasid_setup_nested() - Set up PASID entry for nested translation.
* This could be used for guest shared virtual address. In this case, the
* first level page tables are used for GVA-GPA translation in the guest,
* second level page tables are used for GPA-HPA translation.
*
* @iommu: IOMMU which the device belong to
* @dev: Device to be set up for translation
* @gpgd: FLPTPTR: First Level Page translation pointer in GPA
* @pasid: PASID to be programmed in the device PASID table
* @pasid_data: Additional PASID info from the guest bind request
* @domain: Domain info for setting up second level page tables
* @addr_width: Address width of the first level (guest)
*/
int intel_pasid_setup_nested(struct intel_iommu *iommu, struct device *dev,
pgd_t *gpgd, u32 pasid,
struct iommu_gpasid_bind_data_vtd *pasid_data,
struct dmar_domain *domain, int addr_width)
{
struct pasid_entry *pte;
struct dma_pte *pgd;
int ret = 0;
u64 pgd_val;
int agaw;
u16 did;
if (!ecap_nest(iommu->ecap)) {
pr_err_ratelimited("IOMMU: %s: No nested translation support\n",
iommu->name);
return -EINVAL;
}
if (!(domain->flags & DOMAIN_FLAG_NESTING_MODE)) {
pr_err_ratelimited("Domain is not in nesting mode, %x\n",
domain->flags);
return -EINVAL;
}
pte = intel_pasid_get_entry(dev, pasid);
if (WARN_ON(!pte))
return -EINVAL;
/*
* Caller must ensure PASID entry is not in use, i.e. not bind the
* same PASID to the same device twice.
*/
if (pasid_pte_is_present(pte))
return -EBUSY;
pasid_clear_entry(pte);
/* Sanity checking performed by caller to make sure address
* width matching in two dimensions:
* 1. CPU vs. IOMMU
* 2. Guest vs. Host.
*/
switch (addr_width) {
#ifdef CONFIG_X86
case ADDR_WIDTH_5LEVEL:
if (!cpu_feature_enabled(X86_FEATURE_LA57) ||
!cap_5lp_support(iommu->cap)) {
dev_err_ratelimited(dev,
"5-level paging not supported\n");
return -EINVAL;
}
pasid_set_flpm(pte, 1);
break;
#endif
case ADDR_WIDTH_4LEVEL:
pasid_set_flpm(pte, 0);
break;
default:
dev_err_ratelimited(dev, "Invalid guest address width %d\n",
addr_width);
return -EINVAL;
}
/* First level PGD is in GPA, must be supported by the second level */
if ((uintptr_t)gpgd > domain->max_addr) {
dev_err_ratelimited(dev,
"Guest PGD %lx not supported, max %llx\n",
(uintptr_t)gpgd, domain->max_addr);
return -EINVAL;
}
pasid_set_flptr(pte, (uintptr_t)gpgd);
ret = intel_pasid_setup_bind_data(iommu, pte, pasid_data);
if (ret)
return ret;
/* Setup the second level based on the given domain */
pgd = domain->pgd;
agaw = iommu_skip_agaw(domain, iommu, &pgd);
if (agaw < 0) {
dev_err_ratelimited(dev, "Invalid domain page table\n");
return -EINVAL;
}
pgd_val = virt_to_phys(pgd);
pasid_set_slptr(pte, pgd_val);
pasid_set_fault_enable(pte);
did = domain->iommu_did[iommu->seq_id];
pasid_set_domain_id(pte, did);
pasid_set_address_width(pte, agaw);
pasid_set_page_snoop(pte, !!ecap_smpwc(iommu->ecap));
pasid_set_translation_type(pte, PASID_ENTRY_PGTT_NESTED);
pasid_set_present(pte);
pasid_flush_caches(iommu, pte, pasid, did);
return ret;
}