![Mike Rapoport](/assets/img/avatar_default.png)
Patch series "mm: consolidate definitions of page table accessors", v2. The low level page table accessors (pXY_index(), pXY_offset()) are duplicated across all architectures and sometimes more than once. For instance, we have 31 definition of pgd_offset() for 25 supported architectures. Most of these definitions are actually identical and typically it boils down to, e.g. static inline unsigned long pmd_index(unsigned long address) { return (address >> PMD_SHIFT) & (PTRS_PER_PMD - 1); } static inline pmd_t *pmd_offset(pud_t *pud, unsigned long address) { return (pmd_t *)pud_page_vaddr(*pud) + pmd_index(address); } These definitions can be shared among 90% of the arches provided XYZ_SHIFT, PTRS_PER_XYZ and xyz_page_vaddr() are defined. For architectures that really need a custom version there is always possibility to override the generic version with the usual ifdefs magic. These patches introduce include/linux/pgtable.h that replaces include/asm-generic/pgtable.h and add the definitions of the page table accessors to the new header. This patch (of 12): The linux/mm.h header includes <asm/pgtable.h> to allow inlining of the functions involving page table manipulations, e.g. pte_alloc() and pmd_alloc(). So, there is no point to explicitly include <asm/pgtable.h> in the files that include <linux/mm.h>. The include statements in such cases are remove with a simple loop: for f in $(git grep -l "include <linux/mm.h>") ; do sed -i -e '/include <asm\/pgtable.h>/ d' $f done Signed-off-by: Mike Rapoport <rppt@linux.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Cain <bcain@codeaurora.org> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Chris Zankel <chris@zankel.net> Cc: "David S. Miller" <davem@davemloft.net> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Greentime Hu <green.hu@gmail.com> Cc: Greg Ungerer <gerg@linux-m68k.org> Cc: Guan Xuetao <gxt@pku.edu.cn> Cc: Guo Ren <guoren@kernel.org> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Helge Deller <deller@gmx.de> Cc: Ingo Molnar <mingo@redhat.com> Cc: Ley Foon Tan <ley.foon.tan@intel.com> Cc: Mark Salter <msalter@redhat.com> Cc: Matthew Wilcox <willy@infradead.org> Cc: Matt Turner <mattst88@gmail.com> Cc: Max Filippov <jcmvbkbc@gmail.com> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Michal Simek <monstr@monstr.eu> Cc: Mike Rapoport <rppt@kernel.org> Cc: Nick Hu <nickhu@andestech.com> Cc: Paul Walmsley <paul.walmsley@sifive.com> Cc: Richard Weinberger <richard@nod.at> Cc: Rich Felker <dalias@libc.org> Cc: Russell King <linux@armlinux.org.uk> Cc: Stafford Horne <shorne@gmail.com> Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Tony Luck <tony.luck@intel.com> Cc: Vincent Chen <deanbo422@gmail.com> Cc: Vineet Gupta <vgupta@synopsys.com> Cc: Will Deacon <will@kernel.org> Cc: Yoshinori Sato <ysato@users.sourceforge.jp> Link: http://lkml.kernel.org/r/20200514170327.31389-1-rppt@kernel.org Link: http://lkml.kernel.org/r/20200514170327.31389-2-rppt@kernel.org Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
270 lines
6.8 KiB
C
270 lines
6.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Virtual Memory Map support
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*
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* (C) 2007 sgi. Christoph Lameter.
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*
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* Virtual memory maps allow VM primitives pfn_to_page, page_to_pfn,
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* virt_to_page, page_address() to be implemented as a base offset
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* calculation without memory access.
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*
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* However, virtual mappings need a page table and TLBs. Many Linux
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* architectures already map their physical space using 1-1 mappings
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* via TLBs. For those arches the virtual memory map is essentially
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* for free if we use the same page size as the 1-1 mappings. In that
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* case the overhead consists of a few additional pages that are
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* allocated to create a view of memory for vmemmap.
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*
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* The architecture is expected to provide a vmemmap_populate() function
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* to instantiate the mapping.
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*/
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#include <linux/mm.h>
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#include <linux/mmzone.h>
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#include <linux/memblock.h>
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#include <linux/memremap.h>
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#include <linux/highmem.h>
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#include <linux/vmalloc.h>
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#include <linux/sched.h>
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#include <asm/dma.h>
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#include <asm/pgalloc.h>
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/*
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* Allocate a block of memory to be used to back the virtual memory map
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* or to back the page tables that are used to create the mapping.
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* Uses the main allocators if they are available, else bootmem.
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*/
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static void * __ref __earlyonly_bootmem_alloc(int node,
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unsigned long size,
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unsigned long align,
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unsigned long goal)
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{
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return memblock_alloc_try_nid_raw(size, align, goal,
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MEMBLOCK_ALLOC_ACCESSIBLE, node);
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}
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void * __meminit vmemmap_alloc_block(unsigned long size, int node)
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{
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/* If the main allocator is up use that, fallback to bootmem. */
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if (slab_is_available()) {
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gfp_t gfp_mask = GFP_KERNEL|__GFP_RETRY_MAYFAIL|__GFP_NOWARN;
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int order = get_order(size);
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static bool warned;
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struct page *page;
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page = alloc_pages_node(node, gfp_mask, order);
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if (page)
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return page_address(page);
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if (!warned) {
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warn_alloc(gfp_mask & ~__GFP_NOWARN, NULL,
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"vmemmap alloc failure: order:%u", order);
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warned = true;
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}
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return NULL;
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} else
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return __earlyonly_bootmem_alloc(node, size, size,
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__pa(MAX_DMA_ADDRESS));
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}
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/* need to make sure size is all the same during early stage */
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void * __meminit vmemmap_alloc_block_buf(unsigned long size, int node)
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{
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void *ptr = sparse_buffer_alloc(size);
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if (!ptr)
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ptr = vmemmap_alloc_block(size, node);
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return ptr;
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}
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static unsigned long __meminit vmem_altmap_next_pfn(struct vmem_altmap *altmap)
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{
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return altmap->base_pfn + altmap->reserve + altmap->alloc
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+ altmap->align;
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}
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static unsigned long __meminit vmem_altmap_nr_free(struct vmem_altmap *altmap)
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{
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unsigned long allocated = altmap->alloc + altmap->align;
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if (altmap->free > allocated)
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return altmap->free - allocated;
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return 0;
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}
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/**
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* altmap_alloc_block_buf - allocate pages from the device page map
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* @altmap: device page map
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* @size: size (in bytes) of the allocation
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*
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* Allocations are aligned to the size of the request.
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*/
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void * __meminit altmap_alloc_block_buf(unsigned long size,
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struct vmem_altmap *altmap)
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{
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unsigned long pfn, nr_pfns, nr_align;
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if (size & ~PAGE_MASK) {
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pr_warn_once("%s: allocations must be multiple of PAGE_SIZE (%ld)\n",
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__func__, size);
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return NULL;
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}
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pfn = vmem_altmap_next_pfn(altmap);
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nr_pfns = size >> PAGE_SHIFT;
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nr_align = 1UL << find_first_bit(&nr_pfns, BITS_PER_LONG);
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nr_align = ALIGN(pfn, nr_align) - pfn;
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if (nr_pfns + nr_align > vmem_altmap_nr_free(altmap))
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return NULL;
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altmap->alloc += nr_pfns;
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altmap->align += nr_align;
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pfn += nr_align;
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pr_debug("%s: pfn: %#lx alloc: %ld align: %ld nr: %#lx\n",
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__func__, pfn, altmap->alloc, altmap->align, nr_pfns);
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return __va(__pfn_to_phys(pfn));
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}
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void __meminit vmemmap_verify(pte_t *pte, int node,
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unsigned long start, unsigned long end)
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{
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unsigned long pfn = pte_pfn(*pte);
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int actual_node = early_pfn_to_nid(pfn);
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if (node_distance(actual_node, node) > LOCAL_DISTANCE)
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pr_warn("[%lx-%lx] potential offnode page_structs\n",
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start, end - 1);
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}
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pte_t * __meminit vmemmap_pte_populate(pmd_t *pmd, unsigned long addr, int node)
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{
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pte_t *pte = pte_offset_kernel(pmd, addr);
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if (pte_none(*pte)) {
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pte_t entry;
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void *p = vmemmap_alloc_block_buf(PAGE_SIZE, node);
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if (!p)
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return NULL;
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entry = pfn_pte(__pa(p) >> PAGE_SHIFT, PAGE_KERNEL);
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set_pte_at(&init_mm, addr, pte, entry);
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}
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return pte;
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}
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static void * __meminit vmemmap_alloc_block_zero(unsigned long size, int node)
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{
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void *p = vmemmap_alloc_block(size, node);
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if (!p)
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return NULL;
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memset(p, 0, size);
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return p;
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}
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pmd_t * __meminit vmemmap_pmd_populate(pud_t *pud, unsigned long addr, int node)
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{
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pmd_t *pmd = pmd_offset(pud, addr);
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if (pmd_none(*pmd)) {
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void *p = vmemmap_alloc_block_zero(PAGE_SIZE, node);
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if (!p)
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return NULL;
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pmd_populate_kernel(&init_mm, pmd, p);
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}
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return pmd;
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}
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pud_t * __meminit vmemmap_pud_populate(p4d_t *p4d, unsigned long addr, int node)
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{
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pud_t *pud = pud_offset(p4d, addr);
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if (pud_none(*pud)) {
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void *p = vmemmap_alloc_block_zero(PAGE_SIZE, node);
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if (!p)
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return NULL;
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pud_populate(&init_mm, pud, p);
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}
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return pud;
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}
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p4d_t * __meminit vmemmap_p4d_populate(pgd_t *pgd, unsigned long addr, int node)
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{
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p4d_t *p4d = p4d_offset(pgd, addr);
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if (p4d_none(*p4d)) {
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void *p = vmemmap_alloc_block_zero(PAGE_SIZE, node);
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if (!p)
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return NULL;
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p4d_populate(&init_mm, p4d, p);
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}
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return p4d;
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}
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pgd_t * __meminit vmemmap_pgd_populate(unsigned long addr, int node)
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{
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pgd_t *pgd = pgd_offset_k(addr);
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if (pgd_none(*pgd)) {
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void *p = vmemmap_alloc_block_zero(PAGE_SIZE, node);
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if (!p)
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return NULL;
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pgd_populate(&init_mm, pgd, p);
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}
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return pgd;
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}
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int __meminit vmemmap_populate_basepages(unsigned long start,
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unsigned long end, int node)
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{
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unsigned long addr = start;
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pgd_t *pgd;
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p4d_t *p4d;
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pud_t *pud;
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pmd_t *pmd;
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pte_t *pte;
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for (; addr < end; addr += PAGE_SIZE) {
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pgd = vmemmap_pgd_populate(addr, node);
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if (!pgd)
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return -ENOMEM;
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p4d = vmemmap_p4d_populate(pgd, addr, node);
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if (!p4d)
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return -ENOMEM;
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pud = vmemmap_pud_populate(p4d, addr, node);
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if (!pud)
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return -ENOMEM;
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pmd = vmemmap_pmd_populate(pud, addr, node);
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if (!pmd)
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return -ENOMEM;
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pte = vmemmap_pte_populate(pmd, addr, node);
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if (!pte)
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return -ENOMEM;
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vmemmap_verify(pte, node, addr, addr + PAGE_SIZE);
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}
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return 0;
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}
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struct page * __meminit __populate_section_memmap(unsigned long pfn,
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unsigned long nr_pages, int nid, struct vmem_altmap *altmap)
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{
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unsigned long start;
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unsigned long end;
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/*
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* The minimum granularity of memmap extensions is
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* PAGES_PER_SUBSECTION as allocations are tracked in the
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* 'subsection_map' bitmap of the section.
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*/
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end = ALIGN(pfn + nr_pages, PAGES_PER_SUBSECTION);
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pfn &= PAGE_SUBSECTION_MASK;
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nr_pages = end - pfn;
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start = (unsigned long) pfn_to_page(pfn);
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end = start + nr_pages * sizeof(struct page);
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if (vmemmap_populate(start, end, nid, altmap))
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return NULL;
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return pfn_to_page(pfn);
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}
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