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![Anshuman Khandual](/assets/img/avatar_default.png)
Patch series "mm/memory_hotplug: Pre-validate the address range with platform", v5. This series adds a mechanism allowing platforms to weigh in and prevalidate incoming address range before proceeding further with the memory hotplug. This helps prevent potential platform errors for the given address range, down the hotplug call chain, which inevitably fails the hotplug itself. This mechanism was suggested by David Hildenbrand during another discussion with respect to a memory hotplug fix on arm64 platform. https://lore.kernel.org/linux-arm-kernel/1600332402-30123-1-git-send-email-anshuman.khandual@arm.com/ This mechanism focuses on the addressibility aspect and not [sub] section alignment aspect. Hence check_hotplug_memory_range() and check_pfn_span() have been left unchanged. This patch (of 4): This introduces mhp_range_allowed() which can be called in various memory hotplug paths to prevalidate the address range which is being added, with the platform. Then mhp_range_allowed() calls mhp_get_pluggable_range() which provides applicable address range depending on whether linear mapping is required or not. For ranges that require linear mapping, it calls a new arch callback arch_get_mappable_range() which the platform can override. So the new callback, in turn provides the platform an opportunity to configure acceptable memory hotplug address ranges in case there are constraints. This mechanism will help prevent platform specific errors deep down during hotplug calls. This drops now redundant check_hotplug_memory_addressable() check in __add_pages() but instead adds a VM_BUG_ON() check which would ensure that the range has been validated with mhp_range_allowed() earlier in the call chain. Besides mhp_get_pluggable_range() also can be used by potential memory hotplug callers to avail the allowed physical range which would go through on a given platform. This does not really add any new range check in generic memory hotplug but instead compensates for lost checks in arch_add_memory() where applicable and check_hotplug_memory_addressable(), with unified mhp_range_allowed(). [akpm@linux-foundation.org: make pagemap_range() return -EINVAL when mhp_range_allowed() fails] Link: https://lkml.kernel.org/r/1612149902-7867-1-git-send-email-anshuman.khandual@arm.com Link: https://lkml.kernel.org/r/1612149902-7867-2-git-send-email-anshuman.khandual@arm.com Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com> Suggested-by: David Hildenbrand <david@redhat.com> Reviewed-by: David Hildenbrand <david@redhat.com> Reviewed-by: Oscar Salvador <osalvador@suse.de> Cc: Heiko Carstens <hca@linux.ibm.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Vasily Gorbik <gor@linux.ibm.com> # s390 Cc: Will Deacon <will@kernel.org> Cc: Ard Biesheuvel <ardb@kernel.org> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Jason Wang <jasowang@redhat.com> Cc: Jonathan Cameron <Jonathan.Cameron@huawei.com> Cc: "Michael S. Tsirkin" <mst@redhat.com> Cc: Michal Hocko <mhocko@kernel.org> Cc: Pankaj Gupta <pankaj.gupta@cloud.ionos.com> Cc: Pankaj Gupta <pankaj.gupta.linux@gmail.com> Cc: teawater <teawaterz@linux.alibaba.com> Cc: Wei Yang <richard.weiyang@linux.alibaba.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
364 lines
11 KiB
C
364 lines
11 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __LINUX_MEMORY_HOTPLUG_H
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#define __LINUX_MEMORY_HOTPLUG_H
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#include <linux/mmzone.h>
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#include <linux/spinlock.h>
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#include <linux/notifier.h>
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#include <linux/bug.h>
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struct page;
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struct zone;
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struct pglist_data;
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struct mem_section;
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struct memory_block;
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struct resource;
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struct vmem_altmap;
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#ifdef CONFIG_MEMORY_HOTPLUG
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struct page *pfn_to_online_page(unsigned long pfn);
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/*
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* Types for free bootmem stored in page->lru.next. These have to be in
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* some random range in unsigned long space for debugging purposes.
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*/
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enum {
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MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE = 12,
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SECTION_INFO = MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE,
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MIX_SECTION_INFO,
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NODE_INFO,
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MEMORY_HOTPLUG_MAX_BOOTMEM_TYPE = NODE_INFO,
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};
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/* Types for control the zone type of onlined and offlined memory */
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enum {
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/* Offline the memory. */
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MMOP_OFFLINE = 0,
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/* Online the memory. Zone depends, see default_zone_for_pfn(). */
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MMOP_ONLINE,
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/* Online the memory to ZONE_NORMAL. */
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MMOP_ONLINE_KERNEL,
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/* Online the memory to ZONE_MOVABLE. */
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MMOP_ONLINE_MOVABLE,
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};
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/* Flags for add_memory() and friends to specify memory hotplug details. */
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typedef int __bitwise mhp_t;
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/* No special request */
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#define MHP_NONE ((__force mhp_t)0)
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/*
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* Allow merging of the added System RAM resource with adjacent,
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* mergeable resources. After a successful call to add_memory_resource()
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* with this flag set, the resource pointer must no longer be used as it
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* might be stale, or the resource might have changed.
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*/
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#define MHP_MERGE_RESOURCE ((__force mhp_t)BIT(0))
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/*
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* Extended parameters for memory hotplug:
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* altmap: alternative allocator for memmap array (optional)
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* pgprot: page protection flags to apply to newly created page tables
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* (required)
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*/
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struct mhp_params {
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struct vmem_altmap *altmap;
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pgprot_t pgprot;
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};
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bool mhp_range_allowed(u64 start, u64 size, bool need_mapping);
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struct range mhp_get_pluggable_range(bool need_mapping);
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/*
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* Zone resizing functions
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*
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* Note: any attempt to resize a zone should has pgdat_resize_lock()
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* zone_span_writelock() both held. This ensure the size of a zone
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* can't be changed while pgdat_resize_lock() held.
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*/
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static inline unsigned zone_span_seqbegin(struct zone *zone)
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{
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return read_seqbegin(&zone->span_seqlock);
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}
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static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
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{
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return read_seqretry(&zone->span_seqlock, iv);
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}
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static inline void zone_span_writelock(struct zone *zone)
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{
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write_seqlock(&zone->span_seqlock);
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}
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static inline void zone_span_writeunlock(struct zone *zone)
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{
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write_sequnlock(&zone->span_seqlock);
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}
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static inline void zone_seqlock_init(struct zone *zone)
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{
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seqlock_init(&zone->span_seqlock);
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}
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extern int zone_grow_free_lists(struct zone *zone, unsigned long new_nr_pages);
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extern int zone_grow_waitqueues(struct zone *zone, unsigned long nr_pages);
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extern int add_one_highpage(struct page *page, int pfn, int bad_ppro);
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/* VM interface that may be used by firmware interface */
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extern int online_pages(unsigned long pfn, unsigned long nr_pages,
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int online_type, int nid);
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extern struct zone *test_pages_in_a_zone(unsigned long start_pfn,
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unsigned long end_pfn);
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extern void __offline_isolated_pages(unsigned long start_pfn,
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unsigned long end_pfn);
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typedef void (*online_page_callback_t)(struct page *page, unsigned int order);
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extern void generic_online_page(struct page *page, unsigned int order);
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extern int set_online_page_callback(online_page_callback_t callback);
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extern int restore_online_page_callback(online_page_callback_t callback);
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extern int try_online_node(int nid);
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extern int arch_add_memory(int nid, u64 start, u64 size,
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struct mhp_params *params);
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extern u64 max_mem_size;
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extern int mhp_online_type_from_str(const char *str);
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/* Default online_type (MMOP_*) when new memory blocks are added. */
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extern int mhp_default_online_type;
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/* If movable_node boot option specified */
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extern bool movable_node_enabled;
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static inline bool movable_node_is_enabled(void)
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{
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return movable_node_enabled;
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}
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extern void arch_remove_memory(int nid, u64 start, u64 size,
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struct vmem_altmap *altmap);
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extern void __remove_pages(unsigned long start_pfn, unsigned long nr_pages,
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struct vmem_altmap *altmap);
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/* reasonably generic interface to expand the physical pages */
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extern int __add_pages(int nid, unsigned long start_pfn, unsigned long nr_pages,
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struct mhp_params *params);
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#ifndef CONFIG_ARCH_HAS_ADD_PAGES
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static inline int add_pages(int nid, unsigned long start_pfn,
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unsigned long nr_pages, struct mhp_params *params)
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{
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return __add_pages(nid, start_pfn, nr_pages, params);
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}
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#else /* ARCH_HAS_ADD_PAGES */
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int add_pages(int nid, unsigned long start_pfn, unsigned long nr_pages,
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struct mhp_params *params);
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#endif /* ARCH_HAS_ADD_PAGES */
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#ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION
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/*
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* For supporting node-hotadd, we have to allocate a new pgdat.
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*
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* If an arch has generic style NODE_DATA(),
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* node_data[nid] = kzalloc() works well. But it depends on the architecture.
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*
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* In general, generic_alloc_nodedata() is used.
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* Now, arch_free_nodedata() is just defined for error path of node_hot_add.
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*
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*/
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extern pg_data_t *arch_alloc_nodedata(int nid);
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extern void arch_free_nodedata(pg_data_t *pgdat);
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extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat);
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#else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
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#define arch_alloc_nodedata(nid) generic_alloc_nodedata(nid)
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#define arch_free_nodedata(pgdat) generic_free_nodedata(pgdat)
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#ifdef CONFIG_NUMA
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/*
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* If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat.
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* XXX: kmalloc_node() can't work well to get new node's memory at this time.
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* Because, pgdat for the new node is not allocated/initialized yet itself.
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* To use new node's memory, more consideration will be necessary.
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*/
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#define generic_alloc_nodedata(nid) \
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({ \
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kzalloc(sizeof(pg_data_t), GFP_KERNEL); \
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})
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/*
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* This definition is just for error path in node hotadd.
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* For node hotremove, we have to replace this.
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*/
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#define generic_free_nodedata(pgdat) kfree(pgdat)
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extern pg_data_t *node_data[];
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static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
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{
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node_data[nid] = pgdat;
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}
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#else /* !CONFIG_NUMA */
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/* never called */
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static inline pg_data_t *generic_alloc_nodedata(int nid)
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{
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BUG();
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return NULL;
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}
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static inline void generic_free_nodedata(pg_data_t *pgdat)
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{
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}
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static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
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{
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}
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#endif /* CONFIG_NUMA */
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#endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
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#ifdef CONFIG_HAVE_BOOTMEM_INFO_NODE
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extern void __init register_page_bootmem_info_node(struct pglist_data *pgdat);
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#else
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static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
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{
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}
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#endif
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extern void put_page_bootmem(struct page *page);
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extern void get_page_bootmem(unsigned long ingo, struct page *page,
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unsigned long type);
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void get_online_mems(void);
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void put_online_mems(void);
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void mem_hotplug_begin(void);
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void mem_hotplug_done(void);
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#else /* ! CONFIG_MEMORY_HOTPLUG */
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#define pfn_to_online_page(pfn) \
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({ \
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struct page *___page = NULL; \
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if (pfn_valid(pfn)) \
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___page = pfn_to_page(pfn); \
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___page; \
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})
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static inline unsigned zone_span_seqbegin(struct zone *zone)
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{
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return 0;
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}
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static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
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{
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return 0;
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}
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static inline void zone_span_writelock(struct zone *zone) {}
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static inline void zone_span_writeunlock(struct zone *zone) {}
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static inline void zone_seqlock_init(struct zone *zone) {}
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static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
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{
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}
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static inline int try_online_node(int nid)
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{
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return 0;
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}
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static inline void get_online_mems(void) {}
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static inline void put_online_mems(void) {}
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static inline void mem_hotplug_begin(void) {}
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static inline void mem_hotplug_done(void) {}
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static inline bool movable_node_is_enabled(void)
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{
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return false;
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}
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#endif /* ! CONFIG_MEMORY_HOTPLUG */
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/*
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* Keep this declaration outside CONFIG_MEMORY_HOTPLUG as some
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* platforms might override and use arch_get_mappable_range()
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* for internal non memory hotplug purposes.
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*/
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struct range arch_get_mappable_range(void);
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#if defined(CONFIG_MEMORY_HOTPLUG) || defined(CONFIG_DEFERRED_STRUCT_PAGE_INIT)
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/*
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* pgdat resizing functions
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*/
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static inline
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void pgdat_resize_lock(struct pglist_data *pgdat, unsigned long *flags)
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{
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spin_lock_irqsave(&pgdat->node_size_lock, *flags);
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}
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static inline
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void pgdat_resize_unlock(struct pglist_data *pgdat, unsigned long *flags)
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{
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spin_unlock_irqrestore(&pgdat->node_size_lock, *flags);
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}
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static inline
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void pgdat_resize_init(struct pglist_data *pgdat)
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{
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spin_lock_init(&pgdat->node_size_lock);
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}
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#else /* !(CONFIG_MEMORY_HOTPLUG || CONFIG_DEFERRED_STRUCT_PAGE_INIT) */
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/*
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* Stub functions for when hotplug is off
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*/
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static inline void pgdat_resize_lock(struct pglist_data *p, unsigned long *f) {}
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static inline void pgdat_resize_unlock(struct pglist_data *p, unsigned long *f) {}
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static inline void pgdat_resize_init(struct pglist_data *pgdat) {}
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#endif /* !(CONFIG_MEMORY_HOTPLUG || CONFIG_DEFERRED_STRUCT_PAGE_INIT) */
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#ifdef CONFIG_MEMORY_HOTREMOVE
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extern void try_offline_node(int nid);
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extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages);
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extern int remove_memory(int nid, u64 start, u64 size);
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extern void __remove_memory(int nid, u64 start, u64 size);
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extern int offline_and_remove_memory(int nid, u64 start, u64 size);
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#else
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static inline void try_offline_node(int nid) {}
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static inline int offline_pages(unsigned long start_pfn, unsigned long nr_pages)
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{
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return -EINVAL;
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}
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static inline int remove_memory(int nid, u64 start, u64 size)
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{
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return -EBUSY;
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}
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static inline void __remove_memory(int nid, u64 start, u64 size) {}
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#endif /* CONFIG_MEMORY_HOTREMOVE */
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extern void set_zone_contiguous(struct zone *zone);
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extern void clear_zone_contiguous(struct zone *zone);
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#ifdef CONFIG_MEMORY_HOTPLUG
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extern void __ref free_area_init_core_hotplug(int nid);
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extern int __add_memory(int nid, u64 start, u64 size, mhp_t mhp_flags);
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extern int add_memory(int nid, u64 start, u64 size, mhp_t mhp_flags);
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extern int add_memory_resource(int nid, struct resource *resource,
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mhp_t mhp_flags);
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extern int add_memory_driver_managed(int nid, u64 start, u64 size,
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const char *resource_name,
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mhp_t mhp_flags);
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extern void move_pfn_range_to_zone(struct zone *zone, unsigned long start_pfn,
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unsigned long nr_pages,
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struct vmem_altmap *altmap, int migratetype);
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extern void remove_pfn_range_from_zone(struct zone *zone,
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unsigned long start_pfn,
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unsigned long nr_pages);
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extern bool is_memblock_offlined(struct memory_block *mem);
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extern int sparse_add_section(int nid, unsigned long pfn,
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unsigned long nr_pages, struct vmem_altmap *altmap);
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extern void sparse_remove_section(struct mem_section *ms,
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unsigned long pfn, unsigned long nr_pages,
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unsigned long map_offset, struct vmem_altmap *altmap);
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extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map,
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unsigned long pnum);
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extern struct zone *zone_for_pfn_range(int online_type, int nid, unsigned start_pfn,
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unsigned long nr_pages);
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extern int arch_create_linear_mapping(int nid, u64 start, u64 size,
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struct mhp_params *params);
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void arch_remove_linear_mapping(u64 start, u64 size);
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#endif /* CONFIG_MEMORY_HOTPLUG */
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#endif /* __LINUX_MEMORY_HOTPLUG_H */
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