In support of using compound pages for devmap mappings, plumb the pgmap down to the vmemmap_populate implementation. Note that while altmap is retrievable from pgmap the memory hotplug code passes altmap without pgmap[*], so both need to be independently plumbed. So in addition to @altmap, pass @pgmap to sparse section populate functions namely: sparse_add_section section_activate populate_section_memmap __populate_section_memmap Passing @pgmap allows __populate_section_memmap() to both fetch the vmemmap_shift in which memmap metadata is created for and also to let sparse-vmemmap fetch pgmap ranges to co-relate to a given section and pick whether to just reuse tail pages from past onlined sections. While at it, fix the kdoc for @altmap for sparse_add_section(). [*] https://lore.kernel.org/linux-mm/20210319092635.6214-1-osalvador@xxxxxxx/ Signed-off-by: Joao Martins <joao.m.martins@xxxxxxxxxx> Reviewed-by: Dan Williams <dan.j.williams@xxxxxxxxx> Reviewed-by: Muchun Song <songmuchun@xxxxxxxxxxxxx> --- include/linux/memory_hotplug.h | 5 ++++- include/linux/mm.h | 3 ++- mm/memory_hotplug.c | 3 ++- mm/sparse-vmemmap.c | 3 ++- mm/sparse.c | 26 ++++++++++++++++---------- 5 files changed, 26 insertions(+), 14 deletions(-) diff --git a/include/linux/memory_hotplug.h b/include/linux/memory_hotplug.h index 1ce6f8044f1e..e0b2209ab71c 100644 --- a/include/linux/memory_hotplug.h +++ b/include/linux/memory_hotplug.h @@ -15,6 +15,7 @@ struct memory_block; struct memory_group; struct resource; struct vmem_altmap; +struct dev_pagemap; #ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION /* @@ -122,6 +123,7 @@ typedef int __bitwise mhp_t; struct mhp_params { struct vmem_altmap *altmap; pgprot_t pgprot; + struct dev_pagemap *pgmap; }; bool mhp_range_allowed(u64 start, u64 size, bool need_mapping); @@ -333,7 +335,8 @@ extern void remove_pfn_range_from_zone(struct zone *zone, unsigned long nr_pages); 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); + unsigned long nr_pages, struct vmem_altmap *altmap, + struct dev_pagemap *pgmap); extern void sparse_remove_section(struct mem_section *ms, unsigned long pfn, unsigned long nr_pages, unsigned long map_offset, struct vmem_altmap *altmap); diff --git a/include/linux/mm.h b/include/linux/mm.h index 49692a64d645..5f549cf6a4e8 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -3111,7 +3111,8 @@ int vmemmap_remap_alloc(unsigned long start, unsigned long end, void *sparse_buffer_alloc(unsigned long size); struct page * __populate_section_memmap(unsigned long pfn, - unsigned long nr_pages, int nid, struct vmem_altmap *altmap); + unsigned long nr_pages, int nid, struct vmem_altmap *altmap, + struct dev_pagemap *pgmap); 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/memory_hotplug.c b/mm/memory_hotplug.c index aee69281dad6..2cc1c49a2be6 100644 --- a/mm/memory_hotplug.c +++ b/mm/memory_hotplug.c @@ -328,7 +328,8 @@ int __ref __add_pages(int nid, unsigned long pfn, unsigned long nr_pages, /* Select all remaining pages up to the next section boundary */ cur_nr_pages = min(end_pfn - pfn, SECTION_ALIGN_UP(pfn + 1) - pfn); - err = sparse_add_section(nid, pfn, cur_nr_pages, altmap); + err = sparse_add_section(nid, pfn, cur_nr_pages, altmap, + params->pgmap); if (err) break; cond_resched(); diff --git a/mm/sparse-vmemmap.c b/mm/sparse-vmemmap.c index 8aecd6b3896c..c506f77cff23 100644 --- a/mm/sparse-vmemmap.c +++ b/mm/sparse-vmemmap.c @@ -641,7 +641,8 @@ int __meminit vmemmap_populate_basepages(unsigned long start, unsigned long end, } struct page * __meminit __populate_section_memmap(unsigned long pfn, - unsigned long nr_pages, int nid, struct vmem_altmap *altmap) + unsigned long nr_pages, int nid, struct vmem_altmap *altmap, + struct dev_pagemap *pgmap) { unsigned long start = (unsigned long) pfn_to_page(pfn); unsigned long end = start + nr_pages * sizeof(struct page); diff --git a/mm/sparse.c b/mm/sparse.c index 952f06d8f373..d2d76d158b39 100644 --- a/mm/sparse.c +++ b/mm/sparse.c @@ -427,7 +427,8 @@ static unsigned long __init section_map_size(void) } struct page __init *__populate_section_memmap(unsigned long pfn, - unsigned long nr_pages, int nid, struct vmem_altmap *altmap) + unsigned long nr_pages, int nid, struct vmem_altmap *altmap, + struct dev_pagemap *pgmap) { unsigned long size = section_map_size(); struct page *map = sparse_buffer_alloc(size); @@ -524,7 +525,7 @@ static void __init sparse_init_nid(int nid, unsigned long pnum_begin, break; map = __populate_section_memmap(pfn, PAGES_PER_SECTION, - nid, NULL); + nid, NULL, NULL); if (!map) { pr_err("%s: node[%d] memory map backing failed. Some memory will not be available.", __func__, nid); @@ -629,9 +630,10 @@ void offline_mem_sections(unsigned long start_pfn, unsigned long end_pfn) #ifdef CONFIG_SPARSEMEM_VMEMMAP static struct page * __meminit populate_section_memmap(unsigned long pfn, - unsigned long nr_pages, int nid, struct vmem_altmap *altmap) + unsigned long nr_pages, int nid, struct vmem_altmap *altmap, + struct dev_pagemap *pgmap) { - return __populate_section_memmap(pfn, nr_pages, nid, altmap); + return __populate_section_memmap(pfn, nr_pages, nid, altmap, pgmap); } static void depopulate_section_memmap(unsigned long pfn, unsigned long nr_pages, @@ -700,7 +702,8 @@ static int fill_subsection_map(unsigned long pfn, unsigned long nr_pages) } #else struct page * __meminit populate_section_memmap(unsigned long pfn, - unsigned long nr_pages, int nid, struct vmem_altmap *altmap) + unsigned long nr_pages, int nid, struct vmem_altmap *altmap, + struct dev_pagemap *pgmap) { return kvmalloc_node(array_size(sizeof(struct page), PAGES_PER_SECTION), GFP_KERNEL, nid); @@ -823,7 +826,8 @@ static void section_deactivate(unsigned long pfn, unsigned long nr_pages, } static struct page * __meminit section_activate(int nid, unsigned long pfn, - unsigned long nr_pages, struct vmem_altmap *altmap) + unsigned long nr_pages, struct vmem_altmap *altmap, + struct dev_pagemap *pgmap) { struct mem_section *ms = __pfn_to_section(pfn); struct mem_section_usage *usage = NULL; @@ -855,7 +859,7 @@ static struct page * __meminit section_activate(int nid, unsigned long pfn, if (nr_pages < PAGES_PER_SECTION && early_section(ms)) return pfn_to_page(pfn); - memmap = populate_section_memmap(pfn, nr_pages, nid, altmap); + memmap = populate_section_memmap(pfn, nr_pages, nid, altmap, pgmap); if (!memmap) { section_deactivate(pfn, nr_pages, altmap); return ERR_PTR(-ENOMEM); @@ -869,7 +873,8 @@ static struct page * __meminit section_activate(int nid, unsigned long pfn, * @nid: The node to add section on * @start_pfn: start pfn of the memory range * @nr_pages: number of pfns to add in the section - * @altmap: device page map + * @altmap: alternate pfns to allocate the memmap backing store + * @pgmap: alternate compound page geometry for devmap mappings * * This is only intended for hotplug. * @@ -883,7 +888,8 @@ static struct page * __meminit section_activate(int nid, unsigned long pfn, * * -ENOMEM - Out of memory. */ int __meminit sparse_add_section(int nid, unsigned long start_pfn, - unsigned long nr_pages, struct vmem_altmap *altmap) + unsigned long nr_pages, struct vmem_altmap *altmap, + struct dev_pagemap *pgmap) { unsigned long section_nr = pfn_to_section_nr(start_pfn); struct mem_section *ms; @@ -894,7 +900,7 @@ int __meminit sparse_add_section(int nid, unsigned long start_pfn, if (ret < 0) return ret; - memmap = section_activate(nid, start_pfn, nr_pages, altmap); + memmap = section_activate(nid, start_pfn, nr_pages, altmap, pgmap); if (IS_ERR(memmap)) return PTR_ERR(memmap); -- 2.17.2
