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![Yinghai Lu](/assets/img/avatar_default.png)
1. replace find_e820_area with memblock_find_in_range 2. replace reserve_early with memblock_x86_reserve_range 3. replace free_early with memblock_x86_free_range. 4. NO_BOOTMEM will switch to use memblock too. 5. use _e820, _early wrap in the patch, in following patch, will replace them all 6. because memblock_x86_free_range support partial free, we can remove some special care 7. Need to make sure that memblock_find_in_range() is called after memblock_x86_fill() so adjust some calling later in setup.c::setup_arch() -- corruption_check and mptable_update -v2: Move reserve_brk() early Before fill_memblock_area, to avoid overlap between brk and memblock_find_in_range() that could happen We have more then 128 RAM entry in E820 tables, and memblock_x86_fill() could use memblock_find_in_range() to find a new place for memblock.memory.region array. and We don't need to use extend_brk() after fill_memblock_area() So move reserve_brk() early before fill_memblock_area(). -v3: Move find_smp_config early To make sure memblock_find_in_range not find wrong place, if BIOS doesn't put mptable in right place. -v4: Treat RESERVED_KERN as RAM in memblock.memory. and they are already in memblock.reserved already.. use __NOT_KEEP_MEMBLOCK to make sure memblock related code could be freed later. -v5: Generic version __memblock_find_in_range() is going from high to low, and for 32bit active_region for 32bit does include high pages need to replace the limit with memblock.default_alloc_limit, aka get_max_mapped() -v6: Use current_limit instead -v7: check with MEMBLOCK_ERROR instead of -1ULL or -1L -v8: Set memblock_can_resize early to handle EFI with more RAM entries -v9: update after kmemleak changes in mainline Suggested-by: David S. Miller <davem@davemloft.net> Suggested-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Suggested-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Yinghai Lu <yinghai@kernel.org> Signed-off-by: H. Peter Anvin <hpa@zytor.com>
227 lines
5.9 KiB
C
227 lines
5.9 KiB
C
/*
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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 memmory 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/bootmem.h>
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#include <linux/highmem.h>
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#include <linux/module.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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#include <asm/pgtable.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 * __init_refok __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 __alloc_bootmem_node_high(NODE_DATA(node), size, align, goal);
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}
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static void *vmemmap_buf;
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static void *vmemmap_buf_end;
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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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struct page *page;
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if (node_state(node, N_HIGH_MEMORY))
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page = alloc_pages_node(node,
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GFP_KERNEL | __GFP_ZERO, get_order(size));
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else
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page = alloc_pages(GFP_KERNEL | __GFP_ZERO,
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get_order(size));
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if (page)
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return page_address(page);
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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;
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if (!vmemmap_buf)
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return vmemmap_alloc_block(size, node);
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/* take the from buf */
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ptr = (void *)ALIGN((unsigned long)vmemmap_buf, size);
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if (ptr + size > vmemmap_buf_end)
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return vmemmap_alloc_block(size, node);
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vmemmap_buf = ptr + size;
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return ptr;
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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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printk(KERN_WARNING "[%lx-%lx] potential offnode "
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"page_structs\n", 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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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(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(pgd_t *pgd, unsigned long addr, int node)
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{
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pud_t *pud = pud_offset(pgd, addr);
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if (pud_none(*pud)) {
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void *p = vmemmap_alloc_block(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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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(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(struct page *start_page,
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unsigned long size, int node)
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{
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unsigned long addr = (unsigned long)start_page;
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unsigned long end = (unsigned long)(start_page + size);
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pgd_t *pgd;
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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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pud = vmemmap_pud_populate(pgd, 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 sparse_mem_map_populate(unsigned long pnum, int nid)
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{
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struct page *map = pfn_to_page(pnum * PAGES_PER_SECTION);
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int error = vmemmap_populate(map, PAGES_PER_SECTION, nid);
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if (error)
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return NULL;
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return map;
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}
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void __init sparse_mem_maps_populate_node(struct page **map_map,
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unsigned long pnum_begin,
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unsigned long pnum_end,
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unsigned long map_count, int nodeid)
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{
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unsigned long pnum;
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unsigned long size = sizeof(struct page) * PAGES_PER_SECTION;
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void *vmemmap_buf_start;
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size = ALIGN(size, PMD_SIZE);
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vmemmap_buf_start = __earlyonly_bootmem_alloc(nodeid, size * map_count,
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PMD_SIZE, __pa(MAX_DMA_ADDRESS));
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if (vmemmap_buf_start) {
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vmemmap_buf = vmemmap_buf_start;
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vmemmap_buf_end = vmemmap_buf_start + size * map_count;
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}
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for (pnum = pnum_begin; pnum < pnum_end; pnum++) {
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struct mem_section *ms;
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if (!present_section_nr(pnum))
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continue;
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map_map[pnum] = sparse_mem_map_populate(pnum, nodeid);
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if (map_map[pnum])
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continue;
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ms = __nr_to_section(pnum);
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printk(KERN_ERR "%s: sparsemem memory map backing failed "
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"some memory will not be available.\n", __func__);
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ms->section_mem_map = 0;
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}
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if (vmemmap_buf_start) {
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/* need to free left buf */
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free_bootmem(__pa(vmemmap_buf), vmemmap_buf_end - vmemmap_buf);
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vmemmap_buf = NULL;
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vmemmap_buf_end = NULL;
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}
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}
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