From e9c0a3f05477e18d2dae816cb61b62be1b7e90d3 Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Thu, 18 Jul 2019 15:58:11 -0700 Subject: [PATCH] mm/sparsemem: convert kmalloc_section_memmap() to populate_section_memmap() MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Allow sub-section sized ranges to be added to the memmap. populate_section_memmap() takes an explict pfn range rather than assuming a full section, and those parameters are plumbed all the way through to vmmemap_populate(). There should be no sub-section usage in current deployments. New warnings are added to clarify which memmap allocation paths are sub-section capable. Link: http://lkml.kernel.org/r/156092352058.979959.6551283472062305149.stgit@dwillia2-desk3.amr.corp.intel.com Signed-off-by: Dan Williams Reviewed-by: Pavel Tatashin Tested-by: Aneesh Kumar K.V [ppc64] Reviewed-by: Oscar Salvador Cc: Michal Hocko Cc: David Hildenbrand Cc: Logan Gunthorpe Cc: Jane Chu Cc: Jeff Moyer Cc: Jérôme Glisse Cc: Jonathan Corbet Cc: Mike Rapoport Cc: Toshi Kani Cc: Vlastimil Babka Cc: Wei Yang Cc: Jason Gunthorpe Cc: Christoph Hellwig Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- arch/x86/mm/init_64.c | 4 +++- include/linux/mm.h | 4 ++-- mm/sparse-vmemmap.c | 21 ++++++++++++------ mm/sparse.c | 50 +++++++++++++++++++++++-------------------- 4 files changed, 46 insertions(+), 33 deletions(-) diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c index 5a289a2ab108..a6b5c653727b 100644 --- a/arch/x86/mm/init_64.c +++ b/arch/x86/mm/init_64.c @@ -1518,7 +1518,9 @@ int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node, { int err; - if (boot_cpu_has(X86_FEATURE_PSE)) + if (end - start < PAGES_PER_SECTION * sizeof(struct page)) + err = vmemmap_populate_basepages(start, end, node); + else if (boot_cpu_has(X86_FEATURE_PSE)) err = vmemmap_populate_hugepages(start, end, node, altmap); else if (altmap) { pr_err_once("%s: no cpu support for altmap allocations\n", diff --git a/include/linux/mm.h b/include/linux/mm.h index 48ab7b982d82..0334ca97c584 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -2767,8 +2767,8 @@ static inline void print_vma_addr(char *prefix, unsigned long rip) #endif void *sparse_buffer_alloc(unsigned long size); -struct page *sparse_mem_map_populate(unsigned long pnum, int nid, - struct vmem_altmap *altmap); +struct page * __populate_section_memmap(unsigned long pfn, + unsigned long nr_pages, int nid, struct vmem_altmap *altmap); pgd_t *vmemmap_pgd_populate(unsigned long addr, int node); p4d_t *vmemmap_p4d_populate(pgd_t *pgd, unsigned long addr, int node); pud_t *vmemmap_pud_populate(p4d_t *p4d, unsigned long addr, int node); diff --git a/mm/sparse-vmemmap.c b/mm/sparse-vmemmap.c index 7fec05796796..200aef686722 100644 --- a/mm/sparse-vmemmap.c +++ b/mm/sparse-vmemmap.c @@ -245,19 +245,26 @@ int __meminit vmemmap_populate_basepages(unsigned long start, return 0; } -struct page * __meminit sparse_mem_map_populate(unsigned long pnum, int nid, - struct vmem_altmap *altmap) +struct page * __meminit __populate_section_memmap(unsigned long pfn, + unsigned long nr_pages, int nid, struct vmem_altmap *altmap) { unsigned long start; unsigned long end; - struct page *map; - map = pfn_to_page(pnum * PAGES_PER_SECTION); - start = (unsigned long)map; - end = (unsigned long)(map + PAGES_PER_SECTION); + /* + * The minimum granularity of memmap extensions is + * PAGES_PER_SUBSECTION as allocations are tracked in the + * 'subsection_map' bitmap of the section. + */ + end = ALIGN(pfn + nr_pages, PAGES_PER_SUBSECTION); + pfn &= PAGE_SUBSECTION_MASK; + nr_pages = end - pfn; + + start = (unsigned long) pfn_to_page(pfn); + end = start + nr_pages * sizeof(struct page); if (vmemmap_populate(start, end, nid, altmap)) return NULL; - return map; + return pfn_to_page(pfn); } diff --git a/mm/sparse.c b/mm/sparse.c index 26b48ee1a262..6b01022e23a9 100644 --- a/mm/sparse.c +++ b/mm/sparse.c @@ -439,8 +439,8 @@ static unsigned long __init section_map_size(void) return PAGE_ALIGN(sizeof(struct page) * PAGES_PER_SECTION); } -struct page __init *sparse_mem_map_populate(unsigned long pnum, int nid, - struct vmem_altmap *altmap) +struct page __init *__populate_section_memmap(unsigned long pfn, + unsigned long nr_pages, int nid, struct vmem_altmap *altmap) { unsigned long size = section_map_size(); struct page *map = sparse_buffer_alloc(size); @@ -521,10 +521,13 @@ static void __init sparse_init_nid(int nid, unsigned long pnum_begin, } sparse_buffer_init(map_count * section_map_size(), nid); for_each_present_section_nr(pnum_begin, pnum) { + unsigned long pfn = section_nr_to_pfn(pnum); + if (pnum >= pnum_end) break; - map = sparse_mem_map_populate(pnum, nid, NULL); + map = __populate_section_memmap(pfn, PAGES_PER_SECTION, + nid, NULL); if (!map) { pr_err("%s: node[%d] memory map backing failed. Some memory will not be available.", __func__, nid); @@ -625,17 +628,17 @@ void offline_mem_sections(unsigned long start_pfn, unsigned long end_pfn) #endif #ifdef CONFIG_SPARSEMEM_VMEMMAP -static inline struct page *kmalloc_section_memmap(unsigned long pnum, int nid, - struct vmem_altmap *altmap) +static struct page *populate_section_memmap(unsigned long pfn, + unsigned long nr_pages, int nid, struct vmem_altmap *altmap) { - /* This will make the necessary allocations eventually. */ - return sparse_mem_map_populate(pnum, nid, altmap); + return __populate_section_memmap(pfn, nr_pages, nid, altmap); } -static void __kfree_section_memmap(struct page *memmap, + +static void depopulate_section_memmap(unsigned long pfn, unsigned long nr_pages, struct vmem_altmap *altmap) { - unsigned long start = (unsigned long)memmap; - unsigned long end = (unsigned long)(memmap + PAGES_PER_SECTION); + unsigned long start = (unsigned long) pfn_to_page(pfn); + unsigned long end = start + nr_pages * sizeof(struct page); vmemmap_free(start, end, altmap); } @@ -647,7 +650,8 @@ static void free_map_bootmem(struct page *memmap) vmemmap_free(start, end, NULL); } #else -static struct page *__kmalloc_section_memmap(void) +struct page *populate_section_memmap(unsigned long pfn, + unsigned long nr_pages, int nid, struct vmem_altmap *altmap) { struct page *page, *ret; unsigned long memmap_size = sizeof(struct page) * PAGES_PER_SECTION; @@ -668,15 +672,11 @@ got_map_ptr: return ret; } -static inline struct page *kmalloc_section_memmap(unsigned long pnum, int nid, +static void depopulate_section_memmap(unsigned long pfn, unsigned long nr_pages, struct vmem_altmap *altmap) { - return __kmalloc_section_memmap(); -} + struct page *memmap = pfn_to_page(pfn); -static void __kfree_section_memmap(struct page *memmap, - struct vmem_altmap *altmap) -{ if (is_vmalloc_addr(memmap)) vfree(memmap); else @@ -745,12 +745,13 @@ int __meminit sparse_add_one_section(int nid, unsigned long start_pfn, if (ret < 0 && ret != -EEXIST) return ret; ret = 0; - memmap = kmalloc_section_memmap(section_nr, nid, altmap); + memmap = populate_section_memmap(start_pfn, PAGES_PER_SECTION, nid, + altmap); if (!memmap) return -ENOMEM; usage = kzalloc(mem_section_usage_size(), GFP_KERNEL); if (!usage) { - __kfree_section_memmap(memmap, altmap); + depopulate_section_memmap(start_pfn, PAGES_PER_SECTION, altmap); return -ENOMEM; } @@ -773,7 +774,7 @@ int __meminit sparse_add_one_section(int nid, unsigned long start_pfn, out: if (ret < 0) { kfree(usage); - __kfree_section_memmap(memmap, altmap); + depopulate_section_memmap(start_pfn, PAGES_PER_SECTION, altmap); } return ret; } @@ -809,7 +810,8 @@ static inline void clear_hwpoisoned_pages(struct page *memmap, int nr_pages) #endif static void free_section_usage(struct mem_section *ms, struct page *memmap, - struct mem_section_usage *usage, struct vmem_altmap *altmap) + struct mem_section_usage *usage, unsigned long pfn, + unsigned long nr_pages, struct vmem_altmap *altmap) { if (!usage) return; @@ -820,7 +822,7 @@ static void free_section_usage(struct mem_section *ms, struct page *memmap, if (!early_section(ms)) { kfree(usage); if (memmap) - __kfree_section_memmap(memmap, altmap); + depopulate_section_memmap(pfn, nr_pages, altmap); return; } @@ -849,6 +851,8 @@ void sparse_remove_one_section(struct mem_section *ms, unsigned long map_offset, clear_hwpoisoned_pages(memmap + map_offset, PAGES_PER_SECTION - map_offset); - free_section_usage(ms, memmap, usage, altmap); + free_section_usage(ms, memmap, usage, + section_nr_to_pfn(__section_nr(ms)), + PAGES_PER_SECTION, altmap); } #endif /* CONFIG_MEMORY_HOTPLUG */