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![Baoquan He](/assets/img/avatar_default.png)
The code comment above sparse_add_one_section() is obsolete and incorrect. Clean it up and write a new one. Link: http://lkml.kernel.org/r/20190329144250.14315-1-bhe@redhat.com Signed-off-by: Baoquan He <bhe@redhat.com> Acked-by: Michal Hocko <mhocko@suse.com> Reviewed-by: Oscar Salvador <osalvador@suse.de> Reviewed-by: Mukesh Ojha <mojha@codeaurora.org> Reviewed-by: Mike Rapoport <rppt@linux.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
827 lines
22 KiB
C
827 lines
22 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* sparse memory mappings.
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*/
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#include <linux/mm.h>
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#include <linux/slab.h>
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#include <linux/mmzone.h>
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#include <linux/memblock.h>
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#include <linux/compiler.h>
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#include <linux/highmem.h>
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#include <linux/export.h>
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#include <linux/spinlock.h>
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#include <linux/vmalloc.h>
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#include "internal.h"
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#include <asm/dma.h>
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#include <asm/pgalloc.h>
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#include <asm/pgtable.h>
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/*
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* Permanent SPARSEMEM data:
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*
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* 1) mem_section - memory sections, mem_map's for valid memory
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*/
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#ifdef CONFIG_SPARSEMEM_EXTREME
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struct mem_section **mem_section;
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#else
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struct mem_section mem_section[NR_SECTION_ROOTS][SECTIONS_PER_ROOT]
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____cacheline_internodealigned_in_smp;
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#endif
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EXPORT_SYMBOL(mem_section);
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#ifdef NODE_NOT_IN_PAGE_FLAGS
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/*
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* If we did not store the node number in the page then we have to
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* do a lookup in the section_to_node_table in order to find which
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* node the page belongs to.
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*/
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#if MAX_NUMNODES <= 256
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static u8 section_to_node_table[NR_MEM_SECTIONS] __cacheline_aligned;
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#else
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static u16 section_to_node_table[NR_MEM_SECTIONS] __cacheline_aligned;
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#endif
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int page_to_nid(const struct page *page)
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{
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return section_to_node_table[page_to_section(page)];
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}
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EXPORT_SYMBOL(page_to_nid);
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static void set_section_nid(unsigned long section_nr, int nid)
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{
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section_to_node_table[section_nr] = nid;
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}
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#else /* !NODE_NOT_IN_PAGE_FLAGS */
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static inline void set_section_nid(unsigned long section_nr, int nid)
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{
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}
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#endif
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#ifdef CONFIG_SPARSEMEM_EXTREME
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static noinline struct mem_section __ref *sparse_index_alloc(int nid)
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{
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struct mem_section *section = NULL;
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unsigned long array_size = SECTIONS_PER_ROOT *
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sizeof(struct mem_section);
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if (slab_is_available()) {
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section = kzalloc_node(array_size, GFP_KERNEL, nid);
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} else {
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section = memblock_alloc_node(array_size, SMP_CACHE_BYTES,
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nid);
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if (!section)
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panic("%s: Failed to allocate %lu bytes nid=%d\n",
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__func__, array_size, nid);
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}
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return section;
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}
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static int __meminit sparse_index_init(unsigned long section_nr, int nid)
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{
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unsigned long root = SECTION_NR_TO_ROOT(section_nr);
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struct mem_section *section;
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if (mem_section[root])
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return -EEXIST;
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section = sparse_index_alloc(nid);
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if (!section)
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return -ENOMEM;
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mem_section[root] = section;
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return 0;
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}
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#else /* !SPARSEMEM_EXTREME */
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static inline int sparse_index_init(unsigned long section_nr, int nid)
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{
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return 0;
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}
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#endif
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#ifdef CONFIG_SPARSEMEM_EXTREME
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int __section_nr(struct mem_section* ms)
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{
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unsigned long root_nr;
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struct mem_section *root = NULL;
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for (root_nr = 0; root_nr < NR_SECTION_ROOTS; root_nr++) {
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root = __nr_to_section(root_nr * SECTIONS_PER_ROOT);
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if (!root)
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continue;
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if ((ms >= root) && (ms < (root + SECTIONS_PER_ROOT)))
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break;
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}
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VM_BUG_ON(!root);
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return (root_nr * SECTIONS_PER_ROOT) + (ms - root);
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}
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#else
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int __section_nr(struct mem_section* ms)
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{
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return (int)(ms - mem_section[0]);
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}
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#endif
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/*
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* During early boot, before section_mem_map is used for an actual
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* mem_map, we use section_mem_map to store the section's NUMA
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* node. This keeps us from having to use another data structure. The
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* node information is cleared just before we store the real mem_map.
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*/
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static inline unsigned long sparse_encode_early_nid(int nid)
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{
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return (nid << SECTION_NID_SHIFT);
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}
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static inline int sparse_early_nid(struct mem_section *section)
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{
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return (section->section_mem_map >> SECTION_NID_SHIFT);
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}
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/* Validate the physical addressing limitations of the model */
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void __meminit mminit_validate_memmodel_limits(unsigned long *start_pfn,
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unsigned long *end_pfn)
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{
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unsigned long max_sparsemem_pfn = 1UL << (MAX_PHYSMEM_BITS-PAGE_SHIFT);
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/*
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* Sanity checks - do not allow an architecture to pass
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* in larger pfns than the maximum scope of sparsemem:
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*/
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if (*start_pfn > max_sparsemem_pfn) {
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mminit_dprintk(MMINIT_WARNING, "pfnvalidation",
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"Start of range %lu -> %lu exceeds SPARSEMEM max %lu\n",
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*start_pfn, *end_pfn, max_sparsemem_pfn);
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WARN_ON_ONCE(1);
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*start_pfn = max_sparsemem_pfn;
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*end_pfn = max_sparsemem_pfn;
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} else if (*end_pfn > max_sparsemem_pfn) {
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mminit_dprintk(MMINIT_WARNING, "pfnvalidation",
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"End of range %lu -> %lu exceeds SPARSEMEM max %lu\n",
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*start_pfn, *end_pfn, max_sparsemem_pfn);
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WARN_ON_ONCE(1);
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*end_pfn = max_sparsemem_pfn;
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}
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}
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/*
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* There are a number of times that we loop over NR_MEM_SECTIONS,
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* looking for section_present() on each. But, when we have very
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* large physical address spaces, NR_MEM_SECTIONS can also be
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* very large which makes the loops quite long.
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*
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* Keeping track of this gives us an easy way to break out of
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* those loops early.
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*/
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int __highest_present_section_nr;
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static void section_mark_present(struct mem_section *ms)
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{
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int section_nr = __section_nr(ms);
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if (section_nr > __highest_present_section_nr)
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__highest_present_section_nr = section_nr;
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ms->section_mem_map |= SECTION_MARKED_PRESENT;
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}
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static inline int next_present_section_nr(int section_nr)
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{
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do {
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section_nr++;
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if (present_section_nr(section_nr))
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return section_nr;
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} while ((section_nr <= __highest_present_section_nr));
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return -1;
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}
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#define for_each_present_section_nr(start, section_nr) \
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for (section_nr = next_present_section_nr(start-1); \
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((section_nr != -1) && \
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(section_nr <= __highest_present_section_nr)); \
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section_nr = next_present_section_nr(section_nr))
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static inline unsigned long first_present_section_nr(void)
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{
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return next_present_section_nr(-1);
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}
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/* Record a memory area against a node. */
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void __init memory_present(int nid, unsigned long start, unsigned long end)
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{
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unsigned long pfn;
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#ifdef CONFIG_SPARSEMEM_EXTREME
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if (unlikely(!mem_section)) {
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unsigned long size, align;
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size = sizeof(struct mem_section*) * NR_SECTION_ROOTS;
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align = 1 << (INTERNODE_CACHE_SHIFT);
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mem_section = memblock_alloc(size, align);
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if (!mem_section)
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panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
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__func__, size, align);
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}
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#endif
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start &= PAGE_SECTION_MASK;
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mminit_validate_memmodel_limits(&start, &end);
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for (pfn = start; pfn < end; pfn += PAGES_PER_SECTION) {
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unsigned long section = pfn_to_section_nr(pfn);
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struct mem_section *ms;
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sparse_index_init(section, nid);
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set_section_nid(section, nid);
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ms = __nr_to_section(section);
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if (!ms->section_mem_map) {
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ms->section_mem_map = sparse_encode_early_nid(nid) |
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SECTION_IS_ONLINE;
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section_mark_present(ms);
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}
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}
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}
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/*
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* Mark all memblocks as present using memory_present(). This is a
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* convienence function that is useful for a number of arches
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* to mark all of the systems memory as present during initialization.
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*/
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void __init memblocks_present(void)
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{
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struct memblock_region *reg;
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for_each_memblock(memory, reg) {
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memory_present(memblock_get_region_node(reg),
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memblock_region_memory_base_pfn(reg),
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memblock_region_memory_end_pfn(reg));
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}
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}
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/*
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* Subtle, we encode the real pfn into the mem_map such that
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* the identity pfn - section_mem_map will return the actual
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* physical page frame number.
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*/
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static unsigned long sparse_encode_mem_map(struct page *mem_map, unsigned long pnum)
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{
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unsigned long coded_mem_map =
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(unsigned long)(mem_map - (section_nr_to_pfn(pnum)));
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BUILD_BUG_ON(SECTION_MAP_LAST_BIT > (1UL<<PFN_SECTION_SHIFT));
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BUG_ON(coded_mem_map & ~SECTION_MAP_MASK);
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return coded_mem_map;
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}
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/*
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* Decode mem_map from the coded memmap
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*/
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struct page *sparse_decode_mem_map(unsigned long coded_mem_map, unsigned long pnum)
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{
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/* mask off the extra low bits of information */
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coded_mem_map &= SECTION_MAP_MASK;
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return ((struct page *)coded_mem_map) + section_nr_to_pfn(pnum);
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}
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static void __meminit sparse_init_one_section(struct mem_section *ms,
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unsigned long pnum, struct page *mem_map,
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unsigned long *pageblock_bitmap)
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{
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ms->section_mem_map &= ~SECTION_MAP_MASK;
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ms->section_mem_map |= sparse_encode_mem_map(mem_map, pnum) |
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SECTION_HAS_MEM_MAP;
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ms->pageblock_flags = pageblock_bitmap;
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}
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unsigned long usemap_size(void)
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{
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return BITS_TO_LONGS(SECTION_BLOCKFLAGS_BITS) * sizeof(unsigned long);
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}
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#ifdef CONFIG_MEMORY_HOTPLUG
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static unsigned long *__kmalloc_section_usemap(void)
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{
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return kmalloc(usemap_size(), GFP_KERNEL);
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}
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#endif /* CONFIG_MEMORY_HOTPLUG */
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#ifdef CONFIG_MEMORY_HOTREMOVE
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static unsigned long * __init
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sparse_early_usemaps_alloc_pgdat_section(struct pglist_data *pgdat,
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unsigned long size)
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{
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unsigned long goal, limit;
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unsigned long *p;
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int nid;
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/*
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* A page may contain usemaps for other sections preventing the
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* page being freed and making a section unremovable while
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* other sections referencing the usemap remain active. Similarly,
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* a pgdat can prevent a section being removed. If section A
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* contains a pgdat and section B contains the usemap, both
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* sections become inter-dependent. This allocates usemaps
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* from the same section as the pgdat where possible to avoid
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* this problem.
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*/
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goal = __pa(pgdat) & (PAGE_SECTION_MASK << PAGE_SHIFT);
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limit = goal + (1UL << PA_SECTION_SHIFT);
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nid = early_pfn_to_nid(goal >> PAGE_SHIFT);
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again:
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p = memblock_alloc_try_nid(size, SMP_CACHE_BYTES, goal, limit, nid);
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if (!p && limit) {
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limit = 0;
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goto again;
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}
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return p;
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}
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static void __init check_usemap_section_nr(int nid, unsigned long *usemap)
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{
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unsigned long usemap_snr, pgdat_snr;
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static unsigned long old_usemap_snr;
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static unsigned long old_pgdat_snr;
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struct pglist_data *pgdat = NODE_DATA(nid);
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int usemap_nid;
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/* First call */
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if (!old_usemap_snr) {
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old_usemap_snr = NR_MEM_SECTIONS;
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old_pgdat_snr = NR_MEM_SECTIONS;
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}
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usemap_snr = pfn_to_section_nr(__pa(usemap) >> PAGE_SHIFT);
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pgdat_snr = pfn_to_section_nr(__pa(pgdat) >> PAGE_SHIFT);
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if (usemap_snr == pgdat_snr)
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return;
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if (old_usemap_snr == usemap_snr && old_pgdat_snr == pgdat_snr)
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/* skip redundant message */
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return;
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old_usemap_snr = usemap_snr;
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old_pgdat_snr = pgdat_snr;
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usemap_nid = sparse_early_nid(__nr_to_section(usemap_snr));
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if (usemap_nid != nid) {
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pr_info("node %d must be removed before remove section %ld\n",
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nid, usemap_snr);
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return;
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}
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/*
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* There is a circular dependency.
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* Some platforms allow un-removable section because they will just
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* gather other removable sections for dynamic partitioning.
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* Just notify un-removable section's number here.
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*/
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pr_info("Section %ld and %ld (node %d) have a circular dependency on usemap and pgdat allocations\n",
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usemap_snr, pgdat_snr, nid);
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}
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#else
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static unsigned long * __init
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sparse_early_usemaps_alloc_pgdat_section(struct pglist_data *pgdat,
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unsigned long size)
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{
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return memblock_alloc_node(size, SMP_CACHE_BYTES, pgdat->node_id);
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}
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static void __init check_usemap_section_nr(int nid, unsigned long *usemap)
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{
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}
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#endif /* CONFIG_MEMORY_HOTREMOVE */
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#ifdef CONFIG_SPARSEMEM_VMEMMAP
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static unsigned long __init section_map_size(void)
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{
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return ALIGN(sizeof(struct page) * PAGES_PER_SECTION, PMD_SIZE);
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}
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#else
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static unsigned long __init section_map_size(void)
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{
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return PAGE_ALIGN(sizeof(struct page) * PAGES_PER_SECTION);
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}
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struct page __init *sparse_mem_map_populate(unsigned long pnum, int nid,
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struct vmem_altmap *altmap)
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{
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unsigned long size = section_map_size();
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struct page *map = sparse_buffer_alloc(size);
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phys_addr_t addr = __pa(MAX_DMA_ADDRESS);
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if (map)
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return map;
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map = memblock_alloc_try_nid(size,
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PAGE_SIZE, addr,
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MEMBLOCK_ALLOC_ACCESSIBLE, nid);
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if (!map)
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panic("%s: Failed to allocate %lu bytes align=0x%lx nid=%d from=%pa\n",
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__func__, size, PAGE_SIZE, nid, &addr);
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return map;
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}
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#endif /* !CONFIG_SPARSEMEM_VMEMMAP */
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static void *sparsemap_buf __meminitdata;
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static void *sparsemap_buf_end __meminitdata;
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static void __init sparse_buffer_init(unsigned long size, int nid)
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{
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phys_addr_t addr = __pa(MAX_DMA_ADDRESS);
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WARN_ON(sparsemap_buf); /* forgot to call sparse_buffer_fini()? */
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sparsemap_buf =
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memblock_alloc_try_nid_raw(size, PAGE_SIZE,
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addr,
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MEMBLOCK_ALLOC_ACCESSIBLE, nid);
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sparsemap_buf_end = sparsemap_buf + size;
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}
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static void __init sparse_buffer_fini(void)
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{
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unsigned long size = sparsemap_buf_end - sparsemap_buf;
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if (sparsemap_buf && size > 0)
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memblock_free_early(__pa(sparsemap_buf), size);
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sparsemap_buf = NULL;
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}
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void * __meminit sparse_buffer_alloc(unsigned long size)
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{
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void *ptr = NULL;
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if (sparsemap_buf) {
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ptr = PTR_ALIGN(sparsemap_buf, size);
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if (ptr + size > sparsemap_buf_end)
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ptr = NULL;
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else
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sparsemap_buf = ptr + size;
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}
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return ptr;
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}
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void __weak __meminit vmemmap_populate_print_last(void)
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{
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}
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/*
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* Initialize sparse on a specific node. The node spans [pnum_begin, pnum_end)
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* And number of present sections in this node is map_count.
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*/
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static void __init sparse_init_nid(int nid, unsigned long pnum_begin,
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unsigned long pnum_end,
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unsigned long map_count)
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{
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unsigned long pnum, usemap_longs, *usemap;
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struct page *map;
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usemap_longs = BITS_TO_LONGS(SECTION_BLOCKFLAGS_BITS);
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usemap = sparse_early_usemaps_alloc_pgdat_section(NODE_DATA(nid),
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usemap_size() *
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map_count);
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if (!usemap) {
|
|
pr_err("%s: node[%d] usemap allocation failed", __func__, nid);
|
|
goto failed;
|
|
}
|
|
sparse_buffer_init(map_count * section_map_size(), nid);
|
|
for_each_present_section_nr(pnum_begin, pnum) {
|
|
if (pnum >= pnum_end)
|
|
break;
|
|
|
|
map = sparse_mem_map_populate(pnum, nid, NULL);
|
|
if (!map) {
|
|
pr_err("%s: node[%d] memory map backing failed. Some memory will not be available.",
|
|
__func__, nid);
|
|
pnum_begin = pnum;
|
|
goto failed;
|
|
}
|
|
check_usemap_section_nr(nid, usemap);
|
|
sparse_init_one_section(__nr_to_section(pnum), pnum, map, usemap);
|
|
usemap += usemap_longs;
|
|
}
|
|
sparse_buffer_fini();
|
|
return;
|
|
failed:
|
|
/* We failed to allocate, mark all the following pnums as not present */
|
|
for_each_present_section_nr(pnum_begin, pnum) {
|
|
struct mem_section *ms;
|
|
|
|
if (pnum >= pnum_end)
|
|
break;
|
|
ms = __nr_to_section(pnum);
|
|
ms->section_mem_map = 0;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Allocate the accumulated non-linear sections, allocate a mem_map
|
|
* for each and record the physical to section mapping.
|
|
*/
|
|
void __init sparse_init(void)
|
|
{
|
|
unsigned long pnum_begin = first_present_section_nr();
|
|
int nid_begin = sparse_early_nid(__nr_to_section(pnum_begin));
|
|
unsigned long pnum_end, map_count = 1;
|
|
|
|
/* Setup pageblock_order for HUGETLB_PAGE_SIZE_VARIABLE */
|
|
set_pageblock_order();
|
|
|
|
for_each_present_section_nr(pnum_begin + 1, pnum_end) {
|
|
int nid = sparse_early_nid(__nr_to_section(pnum_end));
|
|
|
|
if (nid == nid_begin) {
|
|
map_count++;
|
|
continue;
|
|
}
|
|
/* Init node with sections in range [pnum_begin, pnum_end) */
|
|
sparse_init_nid(nid_begin, pnum_begin, pnum_end, map_count);
|
|
nid_begin = nid;
|
|
pnum_begin = pnum_end;
|
|
map_count = 1;
|
|
}
|
|
/* cover the last node */
|
|
sparse_init_nid(nid_begin, pnum_begin, pnum_end, map_count);
|
|
vmemmap_populate_print_last();
|
|
}
|
|
|
|
#ifdef CONFIG_MEMORY_HOTPLUG
|
|
|
|
/* Mark all memory sections within the pfn range as online */
|
|
void online_mem_sections(unsigned long start_pfn, unsigned long end_pfn)
|
|
{
|
|
unsigned long pfn;
|
|
|
|
for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) {
|
|
unsigned long section_nr = pfn_to_section_nr(pfn);
|
|
struct mem_section *ms;
|
|
|
|
/* onlining code should never touch invalid ranges */
|
|
if (WARN_ON(!valid_section_nr(section_nr)))
|
|
continue;
|
|
|
|
ms = __nr_to_section(section_nr);
|
|
ms->section_mem_map |= SECTION_IS_ONLINE;
|
|
}
|
|
}
|
|
|
|
#ifdef CONFIG_MEMORY_HOTREMOVE
|
|
/* Mark all memory sections within the pfn range as offline */
|
|
void offline_mem_sections(unsigned long start_pfn, unsigned long end_pfn)
|
|
{
|
|
unsigned long pfn;
|
|
|
|
for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) {
|
|
unsigned long section_nr = pfn_to_section_nr(pfn);
|
|
struct mem_section *ms;
|
|
|
|
/*
|
|
* TODO this needs some double checking. Offlining code makes
|
|
* sure to check pfn_valid but those checks might be just bogus
|
|
*/
|
|
if (WARN_ON(!valid_section_nr(section_nr)))
|
|
continue;
|
|
|
|
ms = __nr_to_section(section_nr);
|
|
ms->section_mem_map &= ~SECTION_IS_ONLINE;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_SPARSEMEM_VMEMMAP
|
|
static inline struct page *kmalloc_section_memmap(unsigned long pnum, int nid,
|
|
struct vmem_altmap *altmap)
|
|
{
|
|
/* This will make the necessary allocations eventually. */
|
|
return sparse_mem_map_populate(pnum, nid, altmap);
|
|
}
|
|
static void __kfree_section_memmap(struct page *memmap,
|
|
struct vmem_altmap *altmap)
|
|
{
|
|
unsigned long start = (unsigned long)memmap;
|
|
unsigned long end = (unsigned long)(memmap + PAGES_PER_SECTION);
|
|
|
|
vmemmap_free(start, end, altmap);
|
|
}
|
|
#ifdef CONFIG_MEMORY_HOTREMOVE
|
|
static void free_map_bootmem(struct page *memmap)
|
|
{
|
|
unsigned long start = (unsigned long)memmap;
|
|
unsigned long end = (unsigned long)(memmap + PAGES_PER_SECTION);
|
|
|
|
vmemmap_free(start, end, NULL);
|
|
}
|
|
#endif /* CONFIG_MEMORY_HOTREMOVE */
|
|
#else
|
|
static struct page *__kmalloc_section_memmap(void)
|
|
{
|
|
struct page *page, *ret;
|
|
unsigned long memmap_size = sizeof(struct page) * PAGES_PER_SECTION;
|
|
|
|
page = alloc_pages(GFP_KERNEL|__GFP_NOWARN, get_order(memmap_size));
|
|
if (page)
|
|
goto got_map_page;
|
|
|
|
ret = vmalloc(memmap_size);
|
|
if (ret)
|
|
goto got_map_ptr;
|
|
|
|
return NULL;
|
|
got_map_page:
|
|
ret = (struct page *)pfn_to_kaddr(page_to_pfn(page));
|
|
got_map_ptr:
|
|
|
|
return ret;
|
|
}
|
|
|
|
static inline struct page *kmalloc_section_memmap(unsigned long pnum, int nid,
|
|
struct vmem_altmap *altmap)
|
|
{
|
|
return __kmalloc_section_memmap();
|
|
}
|
|
|
|
static void __kfree_section_memmap(struct page *memmap,
|
|
struct vmem_altmap *altmap)
|
|
{
|
|
if (is_vmalloc_addr(memmap))
|
|
vfree(memmap);
|
|
else
|
|
free_pages((unsigned long)memmap,
|
|
get_order(sizeof(struct page) * PAGES_PER_SECTION));
|
|
}
|
|
|
|
#ifdef CONFIG_MEMORY_HOTREMOVE
|
|
static void free_map_bootmem(struct page *memmap)
|
|
{
|
|
unsigned long maps_section_nr, removing_section_nr, i;
|
|
unsigned long magic, nr_pages;
|
|
struct page *page = virt_to_page(memmap);
|
|
|
|
nr_pages = PAGE_ALIGN(PAGES_PER_SECTION * sizeof(struct page))
|
|
>> PAGE_SHIFT;
|
|
|
|
for (i = 0; i < nr_pages; i++, page++) {
|
|
magic = (unsigned long) page->freelist;
|
|
|
|
BUG_ON(magic == NODE_INFO);
|
|
|
|
maps_section_nr = pfn_to_section_nr(page_to_pfn(page));
|
|
removing_section_nr = page_private(page);
|
|
|
|
/*
|
|
* When this function is called, the removing section is
|
|
* logical offlined state. This means all pages are isolated
|
|
* from page allocator. If removing section's memmap is placed
|
|
* on the same section, it must not be freed.
|
|
* If it is freed, page allocator may allocate it which will
|
|
* be removed physically soon.
|
|
*/
|
|
if (maps_section_nr != removing_section_nr)
|
|
put_page_bootmem(page);
|
|
}
|
|
}
|
|
#endif /* CONFIG_MEMORY_HOTREMOVE */
|
|
#endif /* CONFIG_SPARSEMEM_VMEMMAP */
|
|
|
|
/**
|
|
* sparse_add_one_section - add a memory section
|
|
* @nid: The node to add section on
|
|
* @start_pfn: start pfn of the memory range
|
|
* @altmap: device page map
|
|
*
|
|
* This is only intended for hotplug.
|
|
*
|
|
* Return:
|
|
* * 0 - On success.
|
|
* * -EEXIST - Section has been present.
|
|
* * -ENOMEM - Out of memory.
|
|
*/
|
|
int __meminit sparse_add_one_section(int nid, unsigned long start_pfn,
|
|
struct vmem_altmap *altmap)
|
|
{
|
|
unsigned long section_nr = pfn_to_section_nr(start_pfn);
|
|
struct mem_section *ms;
|
|
struct page *memmap;
|
|
unsigned long *usemap;
|
|
int ret;
|
|
|
|
/*
|
|
* no locking for this, because it does its own
|
|
* plus, it does a kmalloc
|
|
*/
|
|
ret = sparse_index_init(section_nr, nid);
|
|
if (ret < 0 && ret != -EEXIST)
|
|
return ret;
|
|
ret = 0;
|
|
memmap = kmalloc_section_memmap(section_nr, nid, altmap);
|
|
if (!memmap)
|
|
return -ENOMEM;
|
|
usemap = __kmalloc_section_usemap();
|
|
if (!usemap) {
|
|
__kfree_section_memmap(memmap, altmap);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
ms = __pfn_to_section(start_pfn);
|
|
if (ms->section_mem_map & SECTION_MARKED_PRESENT) {
|
|
ret = -EEXIST;
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* Poison uninitialized struct pages in order to catch invalid flags
|
|
* combinations.
|
|
*/
|
|
page_init_poison(memmap, sizeof(struct page) * PAGES_PER_SECTION);
|
|
|
|
section_mark_present(ms);
|
|
sparse_init_one_section(ms, section_nr, memmap, usemap);
|
|
|
|
out:
|
|
if (ret < 0) {
|
|
kfree(usemap);
|
|
__kfree_section_memmap(memmap, altmap);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
#ifdef CONFIG_MEMORY_HOTREMOVE
|
|
#ifdef CONFIG_MEMORY_FAILURE
|
|
static void clear_hwpoisoned_pages(struct page *memmap, int nr_pages)
|
|
{
|
|
int i;
|
|
|
|
if (!memmap)
|
|
return;
|
|
|
|
/*
|
|
* A further optimization is to have per section refcounted
|
|
* num_poisoned_pages. But that would need more space per memmap, so
|
|
* for now just do a quick global check to speed up this routine in the
|
|
* absence of bad pages.
|
|
*/
|
|
if (atomic_long_read(&num_poisoned_pages) == 0)
|
|
return;
|
|
|
|
for (i = 0; i < nr_pages; i++) {
|
|
if (PageHWPoison(&memmap[i])) {
|
|
atomic_long_sub(1, &num_poisoned_pages);
|
|
ClearPageHWPoison(&memmap[i]);
|
|
}
|
|
}
|
|
}
|
|
#else
|
|
static inline void clear_hwpoisoned_pages(struct page *memmap, int nr_pages)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
static void free_section_usemap(struct page *memmap, unsigned long *usemap,
|
|
struct vmem_altmap *altmap)
|
|
{
|
|
struct page *usemap_page;
|
|
|
|
if (!usemap)
|
|
return;
|
|
|
|
usemap_page = virt_to_page(usemap);
|
|
/*
|
|
* Check to see if allocation came from hot-plug-add
|
|
*/
|
|
if (PageSlab(usemap_page) || PageCompound(usemap_page)) {
|
|
kfree(usemap);
|
|
if (memmap)
|
|
__kfree_section_memmap(memmap, altmap);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* The usemap came from bootmem. This is packed with other usemaps
|
|
* on the section which has pgdat at boot time. Just keep it as is now.
|
|
*/
|
|
|
|
if (memmap)
|
|
free_map_bootmem(memmap);
|
|
}
|
|
|
|
void sparse_remove_one_section(struct zone *zone, struct mem_section *ms,
|
|
unsigned long map_offset, struct vmem_altmap *altmap)
|
|
{
|
|
struct page *memmap = NULL;
|
|
unsigned long *usemap = NULL;
|
|
|
|
if (ms->section_mem_map) {
|
|
usemap = ms->pageblock_flags;
|
|
memmap = sparse_decode_mem_map(ms->section_mem_map,
|
|
__section_nr(ms));
|
|
ms->section_mem_map = 0;
|
|
ms->pageblock_flags = NULL;
|
|
}
|
|
|
|
clear_hwpoisoned_pages(memmap + map_offset,
|
|
PAGES_PER_SECTION - map_offset);
|
|
free_section_usemap(memmap, usemap, altmap);
|
|
}
|
|
#endif /* CONFIG_MEMORY_HOTREMOVE */
|
|
#endif /* CONFIG_MEMORY_HOTPLUG */
|