mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-23 01:10:04 +00:00
![Dan Williams](/assets/img/avatar_default.png)
The libnvdimm sub-system has suffered a series of hacks and broken workarounds for the memory-hotplug implementation's awkward section-aligned (128MB) granularity. For example the following backtrace is emitted when attempting arch_add_memory() with physical address ranges that intersect 'System RAM' (RAM) with 'Persistent Memory' (PMEM) within a given section: # cat /proc/iomem | grep -A1 -B1 Persistent\ Memory 100000000-1ffffffff : System RAM 200000000-303ffffff : Persistent Memory (legacy) 304000000-43fffffff : System RAM 440000000-23ffffffff : Persistent Memory 2400000000-43bfffffff : Persistent Memory 2400000000-43bfffffff : namespace2.0 WARNING: CPU: 38 PID: 928 at arch/x86/mm/init_64.c:850 add_pages+0x5c/0x60 [..] RIP: 0010:add_pages+0x5c/0x60 [..] Call Trace: devm_memremap_pages+0x460/0x6e0 pmem_attach_disk+0x29e/0x680 [nd_pmem] ? nd_dax_probe+0xfc/0x120 [libnvdimm] nvdimm_bus_probe+0x66/0x160 [libnvdimm] It was discovered that the problem goes beyond RAM vs PMEM collisions as some platform produce PMEM vs PMEM collisions within a given section. The libnvdimm workaround for that case revealed that the libnvdimm section-alignment-padding implementation has been broken for a long while. A fix for that long-standing breakage introduces as many problems as it solves as it would require a backward-incompatible change to the namespace metadata interpretation. Instead of that dubious route [1], address the root problem in the memory-hotplug implementation. Note that EEXIST is no longer treated as success as that is how sparse_add_section() reports subsection collisions, it was also obviated by recent changes to perform the request_region() for 'System RAM' before arch_add_memory() in the add_memory() sequence. [1] https://lore.kernel.org/r/155000671719.348031.2347363160141119237.stgit@dwillia2-desk3.amr.corp.intel.com [osalvador@suse.de: fix deactivate_section for early sections] Link: http://lkml.kernel.org/r/20190715081549.32577-2-osalvador@suse.de Link: http://lkml.kernel.org/r/156092354368.979959.6232443923440952359.stgit@dwillia2-desk3.amr.corp.intel.com Signed-off-by: Dan Williams <dan.j.williams@intel.com> Signed-off-by: Oscar Salvador <osalvador@suse.de> Tested-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> [ppc64] Reviewed-by: Oscar Salvador <osalvador@suse.de> Cc: Michal Hocko <mhocko@suse.com> Cc: Vlastimil Babka <vbabka@suse.cz> Cc: Logan Gunthorpe <logang@deltatee.com> Cc: Pavel Tatashin <pasha.tatashin@soleen.com> Cc: David Hildenbrand <david@redhat.com> Cc: Jane Chu <jane.chu@oracle.com> Cc: Jeff Moyer <jmoyer@redhat.com> Cc: Jérôme Glisse <jglisse@redhat.com> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Mike Rapoport <rppt@linux.ibm.com> Cc: Toshi Kani <toshi.kani@hpe.com> Cc: Wei Yang <richardw.yang@linux.intel.com> Cc: Jason Gunthorpe <jgg@mellanox.com> Cc: Christoph Hellwig <hch@lst.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
360 lines
11 KiB
C
360 lines
11 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef __LINUX_MEMORY_HOTPLUG_H
|
|
#define __LINUX_MEMORY_HOTPLUG_H
|
|
|
|
#include <linux/mmzone.h>
|
|
#include <linux/spinlock.h>
|
|
#include <linux/notifier.h>
|
|
#include <linux/bug.h>
|
|
|
|
struct page;
|
|
struct zone;
|
|
struct pglist_data;
|
|
struct mem_section;
|
|
struct memory_block;
|
|
struct resource;
|
|
struct vmem_altmap;
|
|
|
|
#ifdef CONFIG_MEMORY_HOTPLUG
|
|
/*
|
|
* Return page for the valid pfn only if the page is online. All pfn
|
|
* walkers which rely on the fully initialized page->flags and others
|
|
* should use this rather than pfn_valid && pfn_to_page
|
|
*/
|
|
#define pfn_to_online_page(pfn) \
|
|
({ \
|
|
struct page *___page = NULL; \
|
|
unsigned long ___pfn = pfn; \
|
|
unsigned long ___nr = pfn_to_section_nr(___pfn); \
|
|
\
|
|
if (___nr < NR_MEM_SECTIONS && online_section_nr(___nr) && \
|
|
pfn_valid_within(___pfn)) \
|
|
___page = pfn_to_page(___pfn); \
|
|
___page; \
|
|
})
|
|
|
|
/*
|
|
* Types for free bootmem stored in page->lru.next. These have to be in
|
|
* some random range in unsigned long space for debugging purposes.
|
|
*/
|
|
enum {
|
|
MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE = 12,
|
|
SECTION_INFO = MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE,
|
|
MIX_SECTION_INFO,
|
|
NODE_INFO,
|
|
MEMORY_HOTPLUG_MAX_BOOTMEM_TYPE = NODE_INFO,
|
|
};
|
|
|
|
/* Types for control the zone type of onlined and offlined memory */
|
|
enum {
|
|
MMOP_OFFLINE = -1,
|
|
MMOP_ONLINE_KEEP,
|
|
MMOP_ONLINE_KERNEL,
|
|
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
|
|
*
|
|
* Note: any attempt to resize a zone should has pgdat_resize_lock()
|
|
* zone_span_writelock() both held. This ensure the size of a zone
|
|
* can't be changed while pgdat_resize_lock() held.
|
|
*/
|
|
static inline unsigned zone_span_seqbegin(struct zone *zone)
|
|
{
|
|
return read_seqbegin(&zone->span_seqlock);
|
|
}
|
|
static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
|
|
{
|
|
return read_seqretry(&zone->span_seqlock, iv);
|
|
}
|
|
static inline void zone_span_writelock(struct zone *zone)
|
|
{
|
|
write_seqlock(&zone->span_seqlock);
|
|
}
|
|
static inline void zone_span_writeunlock(struct zone *zone)
|
|
{
|
|
write_sequnlock(&zone->span_seqlock);
|
|
}
|
|
static inline void zone_seqlock_init(struct zone *zone)
|
|
{
|
|
seqlock_init(&zone->span_seqlock);
|
|
}
|
|
extern int zone_grow_free_lists(struct zone *zone, unsigned long new_nr_pages);
|
|
extern int zone_grow_waitqueues(struct zone *zone, unsigned long nr_pages);
|
|
extern int add_one_highpage(struct page *page, int pfn, int bad_ppro);
|
|
/* VM interface that may be used by firmware interface */
|
|
extern int online_pages(unsigned long, unsigned long, int);
|
|
extern int test_pages_in_a_zone(unsigned long start_pfn, unsigned long end_pfn,
|
|
unsigned long *valid_start, unsigned long *valid_end);
|
|
extern unsigned long __offline_isolated_pages(unsigned long start_pfn,
|
|
unsigned long end_pfn);
|
|
|
|
typedef void (*online_page_callback_t)(struct page *page, unsigned int order);
|
|
|
|
extern int set_online_page_callback(online_page_callback_t callback);
|
|
extern int restore_online_page_callback(online_page_callback_t callback);
|
|
|
|
extern void __online_page_set_limits(struct page *page);
|
|
extern void __online_page_increment_counters(struct page *page);
|
|
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;
|
|
/* If movable_node boot option specified */
|
|
extern bool movable_node_enabled;
|
|
static inline bool movable_node_is_enabled(void)
|
|
{
|
|
return movable_node_enabled;
|
|
}
|
|
|
|
extern void arch_remove_memory(int nid, u64 start, u64 size,
|
|
struct vmem_altmap *altmap);
|
|
extern void __remove_pages(struct zone *zone, unsigned long start_pfn,
|
|
unsigned long nr_pages, struct vmem_altmap *altmap);
|
|
|
|
/* reasonably generic interface to expand the physical pages */
|
|
extern int __add_pages(int nid, unsigned long start_pfn, unsigned long nr_pages,
|
|
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 mhp_restrictions *restrictions)
|
|
{
|
|
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 mhp_restrictions *restrictions);
|
|
#endif /* ARCH_HAS_ADD_PAGES */
|
|
|
|
#ifdef CONFIG_NUMA
|
|
extern int memory_add_physaddr_to_nid(u64 start);
|
|
#else
|
|
static inline int memory_add_physaddr_to_nid(u64 start)
|
|
{
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION
|
|
/*
|
|
* For supporting node-hotadd, we have to allocate a new pgdat.
|
|
*
|
|
* If an arch has generic style NODE_DATA(),
|
|
* node_data[nid] = kzalloc() works well. But it depends on the architecture.
|
|
*
|
|
* In general, generic_alloc_nodedata() is used.
|
|
* Now, arch_free_nodedata() is just defined for error path of node_hot_add.
|
|
*
|
|
*/
|
|
extern pg_data_t *arch_alloc_nodedata(int nid);
|
|
extern void arch_free_nodedata(pg_data_t *pgdat);
|
|
extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat);
|
|
|
|
#else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
|
|
|
|
#define arch_alloc_nodedata(nid) generic_alloc_nodedata(nid)
|
|
#define arch_free_nodedata(pgdat) generic_free_nodedata(pgdat)
|
|
|
|
#ifdef CONFIG_NUMA
|
|
/*
|
|
* If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat.
|
|
* XXX: kmalloc_node() can't work well to get new node's memory at this time.
|
|
* Because, pgdat for the new node is not allocated/initialized yet itself.
|
|
* To use new node's memory, more consideration will be necessary.
|
|
*/
|
|
#define generic_alloc_nodedata(nid) \
|
|
({ \
|
|
kzalloc(sizeof(pg_data_t), GFP_KERNEL); \
|
|
})
|
|
/*
|
|
* This definition is just for error path in node hotadd.
|
|
* For node hotremove, we have to replace this.
|
|
*/
|
|
#define generic_free_nodedata(pgdat) kfree(pgdat)
|
|
|
|
extern pg_data_t *node_data[];
|
|
static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
|
|
{
|
|
node_data[nid] = pgdat;
|
|
}
|
|
|
|
#else /* !CONFIG_NUMA */
|
|
|
|
/* never called */
|
|
static inline pg_data_t *generic_alloc_nodedata(int nid)
|
|
{
|
|
BUG();
|
|
return NULL;
|
|
}
|
|
static inline void generic_free_nodedata(pg_data_t *pgdat)
|
|
{
|
|
}
|
|
static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
|
|
{
|
|
}
|
|
#endif /* CONFIG_NUMA */
|
|
#endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
|
|
|
|
#ifdef CONFIG_HAVE_BOOTMEM_INFO_NODE
|
|
extern void __init register_page_bootmem_info_node(struct pglist_data *pgdat);
|
|
#else
|
|
static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
|
|
{
|
|
}
|
|
#endif
|
|
extern void put_page_bootmem(struct page *page);
|
|
extern void get_page_bootmem(unsigned long ingo, struct page *page,
|
|
unsigned long type);
|
|
|
|
void get_online_mems(void);
|
|
void put_online_mems(void);
|
|
|
|
void mem_hotplug_begin(void);
|
|
void mem_hotplug_done(void);
|
|
|
|
extern void set_zone_contiguous(struct zone *zone);
|
|
extern void clear_zone_contiguous(struct zone *zone);
|
|
|
|
#else /* ! CONFIG_MEMORY_HOTPLUG */
|
|
#define pfn_to_online_page(pfn) \
|
|
({ \
|
|
struct page *___page = NULL; \
|
|
if (pfn_valid(pfn)) \
|
|
___page = pfn_to_page(pfn); \
|
|
___page; \
|
|
})
|
|
|
|
static inline unsigned zone_span_seqbegin(struct zone *zone)
|
|
{
|
|
return 0;
|
|
}
|
|
static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
|
|
{
|
|
return 0;
|
|
}
|
|
static inline void zone_span_writelock(struct zone *zone) {}
|
|
static inline void zone_span_writeunlock(struct zone *zone) {}
|
|
static inline void zone_seqlock_init(struct zone *zone) {}
|
|
|
|
static inline int mhp_notimplemented(const char *func)
|
|
{
|
|
printk(KERN_WARNING "%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func);
|
|
dump_stack();
|
|
return -ENOSYS;
|
|
}
|
|
|
|
static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
|
|
{
|
|
}
|
|
|
|
static inline int try_online_node(int nid)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline void get_online_mems(void) {}
|
|
static inline void put_online_mems(void) {}
|
|
|
|
static inline void mem_hotplug_begin(void) {}
|
|
static inline void mem_hotplug_done(void) {}
|
|
|
|
static inline bool movable_node_is_enabled(void)
|
|
{
|
|
return false;
|
|
}
|
|
#endif /* ! CONFIG_MEMORY_HOTPLUG */
|
|
|
|
#if defined(CONFIG_MEMORY_HOTPLUG) || defined(CONFIG_DEFERRED_STRUCT_PAGE_INIT)
|
|
/*
|
|
* pgdat resizing functions
|
|
*/
|
|
static inline
|
|
void pgdat_resize_lock(struct pglist_data *pgdat, unsigned long *flags)
|
|
{
|
|
spin_lock_irqsave(&pgdat->node_size_lock, *flags);
|
|
}
|
|
static inline
|
|
void pgdat_resize_unlock(struct pglist_data *pgdat, unsigned long *flags)
|
|
{
|
|
spin_unlock_irqrestore(&pgdat->node_size_lock, *flags);
|
|
}
|
|
static inline
|
|
void pgdat_resize_init(struct pglist_data *pgdat)
|
|
{
|
|
spin_lock_init(&pgdat->node_size_lock);
|
|
}
|
|
#else /* !(CONFIG_MEMORY_HOTPLUG || CONFIG_DEFERRED_STRUCT_PAGE_INIT) */
|
|
/*
|
|
* Stub functions for when hotplug is off
|
|
*/
|
|
static inline void pgdat_resize_lock(struct pglist_data *p, unsigned long *f) {}
|
|
static inline void pgdat_resize_unlock(struct pglist_data *p, unsigned long *f) {}
|
|
static inline void pgdat_resize_init(struct pglist_data *pgdat) {}
|
|
#endif /* !(CONFIG_MEMORY_HOTPLUG || CONFIG_DEFERRED_STRUCT_PAGE_INIT) */
|
|
|
|
#ifdef CONFIG_MEMORY_HOTREMOVE
|
|
|
|
extern bool is_mem_section_removable(unsigned long pfn, unsigned long nr_pages);
|
|
extern void try_offline_node(int nid);
|
|
extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages);
|
|
extern int remove_memory(int nid, u64 start, u64 size);
|
|
extern void __remove_memory(int nid, u64 start, u64 size);
|
|
|
|
#else
|
|
static inline bool is_mem_section_removable(unsigned long pfn,
|
|
unsigned long nr_pages)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
static inline void try_offline_node(int nid) {}
|
|
|
|
static inline int offline_pages(unsigned long start_pfn, unsigned long nr_pages)
|
|
{
|
|
return -EINVAL;
|
|
}
|
|
|
|
static inline int remove_memory(int nid, u64 start, u64 size)
|
|
{
|
|
return -EBUSY;
|
|
}
|
|
|
|
static inline void __remove_memory(int nid, u64 start, u64 size) {}
|
|
#endif /* CONFIG_MEMORY_HOTREMOVE */
|
|
|
|
extern void __ref free_area_init_core_hotplug(int nid);
|
|
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 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);
|
|
extern int sparse_add_section(int nid, unsigned long pfn,
|
|
unsigned long nr_pages, struct vmem_altmap *altmap);
|
|
extern void sparse_remove_section(struct mem_section *ms,
|
|
unsigned long pfn, unsigned long nr_pages,
|
|
unsigned long map_offset, struct vmem_altmap *altmap);
|
|
extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map,
|
|
unsigned long pnum);
|
|
extern bool allow_online_pfn_range(int nid, unsigned long pfn, unsigned long nr_pages,
|
|
int online_type);
|
|
extern struct zone *zone_for_pfn_range(int online_type, int nid, unsigned start_pfn,
|
|
unsigned long nr_pages);
|
|
#endif /* __LINUX_MEMORY_HOTPLUG_H */
|