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mm, memory_hotplug: provide a more generic restrictions for memory hotplug 

arch_add_memory, __add_pages take a want_memblock which controls whether
the newly added memory should get the sysfs memblock user API (e.g.
ZONE_DEVICE users do not want/need this interface).  Some callers even
want to control where do we allocate the memmap from by configuring
altmap.

Add a more generic hotplug context for arch_add_memory and __add_pages.
struct mhp_restrictions contains flags which contains additional features
to be enabled by the memory hotplug (MHP_MEMBLOCK_API currently) and
altmap for alternative memmap allocator.

This patch shouldn't introduce any functional change.

[akpm@linux-foundation.org: build fix]
Link: http://lkml.kernel.org/r/20190408082633.2864-3-osalvador@suse.de
Signed-off-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Oscar Salvador <osalvador@suse.de>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: David Hildenbrand <david@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Michal Hocko 2019-05-13 17:21:26 -07:00 committed by Linus Torvalds
parent 5557c766ab
commit 940519f0c8
10 changed files with 63 additions and 37 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
arch/arm64/mm/mmu.c
View File

@ -1065,8 +1065,8 @@ int p4d_free_pud_page(p4d_t *p4d, unsigned long addr)
}
#ifdef CONFIG_MEMORY_HOTPLUG
int arch_add_memory(int nid, u64 start, u64 size, struct vmem_altmap *altmap,
bool want_memblock)
int arch_add_memory(int nid, u64 start, u64 size,
struct mhp_restrictions *restrictions)
{
int flags = 0;
@ -1077,6 +1077,6 @@ int arch_add_memory(int nid, u64 start, u64 size, struct vmem_altmap *altmap,
size, PAGE_KERNEL, __pgd_pgtable_alloc, flags);
return __add_pages(nid, start >> PAGE_SHIFT, size >> PAGE_SHIFT,
altmap, want_memblock);
restrictions);
}
#endif

6
arch/ia64/mm/init.c
View File

@ -666,14 +666,14 @@ mem_init (void)
}
#ifdef CONFIG_MEMORY_HOTPLUG
int arch_add_memory(int nid, u64 start, u64 size, struct vmem_altmap *altmap,
bool want_memblock)
int arch_add_memory(int nid, u64 start, u64 size,
struct mhp_restrictions *restrictions)
{
unsigned long start_pfn = start >> PAGE_SHIFT;
unsigned long nr_pages = size >> PAGE_SHIFT;
int ret;
ret = __add_pages(nid, start_pfn, nr_pages, altmap, want_memblock);
ret = __add_pages(nid, start_pfn, nr_pages, restrictions);
if (ret)
printk("%s: Problem encountered in __add_pages() as ret=%d\n",
__func__, ret);

6
arch/powerpc/mm/mem.c
View File

@ -109,8 +109,8 @@ int __weak remove_section_mapping(unsigned long start, unsigned long end)
return -ENODEV;
}
int __ref arch_add_memory(int nid, u64 start, u64 size, struct vmem_altmap *altmap,
bool want_memblock)
int __ref arch_add_memory(int nid, u64 start, u64 size,
struct mhp_restrictions *restrictions)
{
unsigned long start_pfn = start >> PAGE_SHIFT;
unsigned long nr_pages = size >> PAGE_SHIFT;
@ -127,7 +127,7 @@ int __ref arch_add_memory(int nid, u64 start, u64 size, struct vmem_altmap *altm
}
flush_inval_dcache_range(start, start + size);
return __add_pages(nid, start_pfn, nr_pages, altmap, want_memblock);
return __add_pages(nid, start_pfn, nr_pages, restrictions);
}
#ifdef CONFIG_MEMORY_HOTREMOVE

6
arch/s390/mm/init.c
View File

@ -219,8 +219,8 @@ device_initcall(s390_cma_mem_init);
#endif /* CONFIG_CMA */
int arch_add_memory(int nid, u64 start, u64 size, struct vmem_altmap *altmap,
bool want_memblock)
int arch_add_memory(int nid, u64 start, u64 size,
struct mhp_restrictions *restrictions)
{
unsigned long start_pfn = PFN_DOWN(start);
unsigned long size_pages = PFN_DOWN(size);
@ -230,7 +230,7 @@ int arch_add_memory(int nid, u64 start, u64 size, struct vmem_altmap *altmap,
if (rc)
return rc;
rc = __add_pages(nid, start_pfn, size_pages, altmap, want_memblock);
rc = __add_pages(nid, start_pfn, size_pages, restrictions);
if (rc)
vmem_remove_mapping(start, size);
return rc;

6
arch/sh/mm/init.c
View File

@ -404,15 +404,15 @@ void __init mem_init(void)
}
#ifdef CONFIG_MEMORY_HOTPLUG
int arch_add_memory(int nid, u64 start, u64 size, struct vmem_altmap *altmap,
bool want_memblock)
int arch_add_memory(int nid, u64 start, u64 size,
struct mhp_restrictions *restrictions)
{
unsigned long start_pfn = PFN_DOWN(start);
unsigned long nr_pages = size >> PAGE_SHIFT;
int ret;
/* We only have ZONE_NORMAL, so this is easy.. */
ret = __add_pages(nid, start_pfn, nr_pages, altmap, want_memblock);
ret = __add_pages(nid, start_pfn, nr_pages, restrictions);
if (unlikely(ret))
printk("%s: Failed, __add_pages() == %d\n", __func__, ret);

6
arch/x86/mm/init_32.c
View File

@ -850,13 +850,13 @@ void __init mem_init(void)
}
#ifdef CONFIG_MEMORY_HOTPLUG
int arch_add_memory(int nid, u64 start, u64 size, struct vmem_altmap *altmap,
bool want_memblock)
int arch_add_memory(int nid, u64 start, u64 size,
struct mhp_restrictions *restrictions)
{
unsigned long start_pfn = start >> PAGE_SHIFT;
unsigned long nr_pages = size >> PAGE_SHIFT;
return __add_pages(nid, start_pfn, nr_pages, altmap, want_memblock);
return __add_pages(nid, start_pfn, nr_pages, restrictions);
}
#ifdef CONFIG_MEMORY_HOTREMOVE

10
arch/x86/mm/init_64.c
View File

@ -777,11 +777,11 @@ static void update_end_of_memory_vars(u64 start, u64 size)
}
int add_pages(int nid, unsigned long start_pfn, unsigned long nr_pages,
struct vmem_altmap *altmap, bool want_memblock)
struct mhp_restrictions *restrictions)
{
int ret;
ret = __add_pages(nid, start_pfn, nr_pages, altmap, want_memblock);
ret = __add_pages(nid, start_pfn, nr_pages, restrictions);
WARN_ON_ONCE(ret);
/* update max_pfn, max_low_pfn and high_memory */
@ -791,15 +791,15 @@ int add_pages(int nid, unsigned long start_pfn, unsigned long nr_pages,
return ret;
}
int arch_add_memory(int nid, u64 start, u64 size, struct vmem_altmap *altmap,
bool want_memblock)
int arch_add_memory(int nid, u64 start, u64 size,
struct mhp_restrictions *restrictions)
{
unsigned long start_pfn = start >> PAGE_SHIFT;
unsigned long nr_pages = size >> PAGE_SHIFT;
init_memory_mapping(start, start + size);
return add_pages(nid, start_pfn, nr_pages, altmap, want_memblock);
return add_pages(nid, start_pfn, nr_pages, restrictions);
}
#define PAGE_INUSE 0xFD

31
include/linux/memory_hotplug.h
View File

@ -53,6 +53,16 @@ enum {
MMOP_ONLINE_MOVABLE,
};
/*
* Restrictions for the memory hotplug:
* flags: MHP_ flags
* altmap: alternative allocator for memmap array
*/
struct mhp_restrictions {
unsigned long flags;
struct vmem_altmap *altmap;
};
/*
* Zone resizing functions
*
@ -101,6 +111,8 @@ extern void __online_page_free(struct page *page);
extern int try_online_node(int nid);
extern int arch_add_memory(int nid, u64 start, u64 size,
struct mhp_restrictions *restrictions);
extern u64 max_mem_size;
extern bool memhp_auto_online;
@ -118,20 +130,27 @@ extern int __remove_pages(struct zone *zone, unsigned long start_pfn,
unsigned long nr_pages, struct vmem_altmap *altmap);
#endif /* CONFIG_MEMORY_HOTREMOVE */
/*
* Do we want sysfs memblock files created. This will allow userspace to online
* and offline memory explicitly. Lack of this bit means that the caller has to
* call move_pfn_range_to_zone to finish the initialization.
*/
#define MHP_MEMBLOCK_API (1<<0)
/* reasonably generic interface to expand the physical pages */
extern int __add_pages(int nid, unsigned long start_pfn, unsigned long nr_pages,
struct vmem_altmap *altmap, bool want_memblock);
struct mhp_restrictions *restrictions);
#ifndef CONFIG_ARCH_HAS_ADD_PAGES
static inline int add_pages(int nid, unsigned long start_pfn,
unsigned long nr_pages, struct vmem_altmap *altmap,
bool want_memblock)
unsigned long nr_pages, struct mhp_restrictions *restrictions)
{
return __add_pages(nid, start_pfn, nr_pages, altmap, want_memblock);
return __add_pages(nid, start_pfn, nr_pages, restrictions);
}
#else /* ARCH_HAS_ADD_PAGES */
int add_pages(int nid, unsigned long start_pfn, unsigned long nr_pages,
struct vmem_altmap *altmap, bool want_memblock);
struct mhp_restrictions *restrictions);
#endif /* ARCH_HAS_ADD_PAGES */
#ifdef CONFIG_NUMA
@ -332,8 +351,6 @@ extern int walk_memory_range(unsigned long start_pfn, unsigned long end_pfn,
extern int __add_memory(int nid, u64 start, u64 size);
extern int add_memory(int nid, u64 start, u64 size);
extern int add_memory_resource(int nid, struct resource *resource);
extern int arch_add_memory(int nid, u64 start, u64 size,
struct vmem_altmap *altmap, bool want_memblock);
extern void move_pfn_range_to_zone(struct zone *zone, unsigned long start_pfn,
unsigned long nr_pages, struct vmem_altmap *altmap);
extern bool is_memblock_offlined(struct memory_block *mem);

12
kernel/memremap.c
View File

@ -148,6 +148,12 @@ void *devm_memremap_pages(struct device *dev, struct dev_pagemap *pgmap)
&pgmap->altmap : NULL;
struct resource *res = &pgmap->res;
struct dev_pagemap *conflict_pgmap;
struct mhp_restrictions restrictions = {
/*
* We do not want any optional features only our own memmap
*/
.altmap = altmap,
};
pgprot_t pgprot = PAGE_KERNEL;
int error, nid, is_ram;
@ -214,7 +220,7 @@ void *devm_memremap_pages(struct device *dev, struct dev_pagemap *pgmap)
*/
if (pgmap->type == MEMORY_DEVICE_PRIVATE) {
error = add_pages(nid, align_start >> PAGE_SHIFT,
align_size >> PAGE_SHIFT, NULL, false);
align_size >> PAGE_SHIFT, &restrictions);
} else {
error = kasan_add_zero_shadow(__va(align_start), align_size);
if (error) {
@ -222,8 +228,8 @@ void *devm_memremap_pages(struct device *dev, struct dev_pagemap *pgmap)
goto err_kasan;
}
error = arch_add_memory(nid, align_start, align_size, altmap,
false);
error = arch_add_memory(nid, align_start, align_size,
&restrictions);
}
if (!error) {

11
mm/memory_hotplug.c
View File

@ -273,12 +273,12 @@ static int __meminit __add_section(int nid, unsigned long phys_start_pfn,
* add the new pages.
*/
int __ref __add_pages(int nid, unsigned long phys_start_pfn,
unsigned long nr_pages, struct vmem_altmap *altmap,
bool want_memblock)
unsigned long nr_pages, struct mhp_restrictions *restrictions)
{
unsigned long i;
int err = 0;
int start_sec, end_sec;
struct vmem_altmap *altmap = restrictions->altmap;
/* during initialize mem_map, align hot-added range to section */
start_sec = pfn_to_section_nr(phys_start_pfn);
@ -299,7 +299,7 @@ int __ref __add_pages(int nid, unsigned long phys_start_pfn,
for (i = start_sec; i <= end_sec; i++) {
err = __add_section(nid, section_nr_to_pfn(i), altmap,
want_memblock);
restrictions->flags & MHP_MEMBLOCK_API);
/*
* EEXIST is finally dealt with by ioresource collision
@ -1097,6 +1097,9 @@ static int online_memory_block(struct memory_block *mem, void *arg)
*/
int __ref add_memory_resource(int nid, struct resource *res)
{
struct mhp_restrictions restrictions = {
.flags = MHP_MEMBLOCK_API,
};
u64 start, size;
bool new_node = false;
int ret;
@ -1124,7 +1127,7 @@ int __ref add_memory_resource(int nid, struct resource *res)
new_node = ret;
/* call arch's memory hotadd */
ret = arch_add_memory(nid, start, size, NULL, true);
ret = arch_add_memory(nid, start, size, &restrictions);
if (ret < 0)
goto error;