![Yinghai Lu](/assets/img/avatar_default.png)
Henrik reported that his MacAir 3.1 would not boot with
| commit 8d57470d8f
| Date: Fri Nov 16 19:38:58 2012 -0800
|
| x86, mm: setup page table in top-down
It turns out that we do not calculate the real_end properly:
We try to get 2M size with 4K alignment, and later will round down
to 2M, so we will get less then 2M for first mapping, in extreme
case could be only 4K only. In Henrik's system it has (1M-32K) as
last usable rage is [mem 0x7f9db000-0x7fef8fff].
The problem is exposed when EFI booting have several holes and it
will force mapping to use PTE instead as we only map usable areas.
To fix it, just make it be 2M aligned, so we can be guaranteed to be
able to use large pages to map it.
Reported-by: Henrik Rydberg <rydberg@euromail.se>
Bisected-by: Henrik Rydberg <rydberg@euromail.se>
Tested-by: Henrik Rydberg <rydberg@euromail.se>
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Link: http://lkml.kernel.org/r/CAE9FiQX4nQ7_1kg5RL_vh56rmcSHXUi1ExrZX7CwED4NGMnHfg@mail.gmail.com
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
579 lines
15 KiB
C
579 lines
15 KiB
C
#include <linux/gfp.h>
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#include <linux/initrd.h>
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#include <linux/ioport.h>
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#include <linux/swap.h>
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#include <linux/memblock.h>
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#include <linux/bootmem.h> /* for max_low_pfn */
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#include <asm/cacheflush.h>
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#include <asm/e820.h>
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#include <asm/init.h>
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#include <asm/page.h>
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#include <asm/page_types.h>
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#include <asm/sections.h>
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#include <asm/setup.h>
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#include <asm/tlbflush.h>
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#include <asm/tlb.h>
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#include <asm/proto.h>
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#include <asm/dma.h> /* for MAX_DMA_PFN */
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#include <asm/microcode.h>
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#include "mm_internal.h"
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static unsigned long __initdata pgt_buf_start;
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static unsigned long __initdata pgt_buf_end;
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static unsigned long __initdata pgt_buf_top;
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static unsigned long min_pfn_mapped;
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static bool __initdata can_use_brk_pgt = true;
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/*
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* Pages returned are already directly mapped.
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*
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* Changing that is likely to break Xen, see commit:
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*
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* 279b706 x86,xen: introduce x86_init.mapping.pagetable_reserve
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*
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* for detailed information.
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*/
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__ref void *alloc_low_pages(unsigned int num)
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{
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unsigned long pfn;
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int i;
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if (after_bootmem) {
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unsigned int order;
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order = get_order((unsigned long)num << PAGE_SHIFT);
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return (void *)__get_free_pages(GFP_ATOMIC | __GFP_NOTRACK |
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__GFP_ZERO, order);
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}
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if ((pgt_buf_end + num) > pgt_buf_top || !can_use_brk_pgt) {
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unsigned long ret;
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if (min_pfn_mapped >= max_pfn_mapped)
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panic("alloc_low_page: ran out of memory");
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ret = memblock_find_in_range(min_pfn_mapped << PAGE_SHIFT,
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max_pfn_mapped << PAGE_SHIFT,
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PAGE_SIZE * num , PAGE_SIZE);
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if (!ret)
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panic("alloc_low_page: can not alloc memory");
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memblock_reserve(ret, PAGE_SIZE * num);
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pfn = ret >> PAGE_SHIFT;
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} else {
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pfn = pgt_buf_end;
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pgt_buf_end += num;
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printk(KERN_DEBUG "BRK [%#010lx, %#010lx] PGTABLE\n",
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pfn << PAGE_SHIFT, (pgt_buf_end << PAGE_SHIFT) - 1);
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}
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for (i = 0; i < num; i++) {
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void *adr;
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adr = __va((pfn + i) << PAGE_SHIFT);
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clear_page(adr);
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}
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return __va(pfn << PAGE_SHIFT);
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}
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/* need 4 4k for initial PMD_SIZE, 4k for 0-ISA_END_ADDRESS */
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#define INIT_PGT_BUF_SIZE (5 * PAGE_SIZE)
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RESERVE_BRK(early_pgt_alloc, INIT_PGT_BUF_SIZE);
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void __init early_alloc_pgt_buf(void)
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{
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unsigned long tables = INIT_PGT_BUF_SIZE;
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phys_addr_t base;
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base = __pa(extend_brk(tables, PAGE_SIZE));
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pgt_buf_start = base >> PAGE_SHIFT;
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pgt_buf_end = pgt_buf_start;
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pgt_buf_top = pgt_buf_start + (tables >> PAGE_SHIFT);
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}
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int after_bootmem;
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int direct_gbpages
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#ifdef CONFIG_DIRECT_GBPAGES
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= 1
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#endif
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;
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static void __init init_gbpages(void)
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{
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#ifdef CONFIG_X86_64
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if (direct_gbpages && cpu_has_gbpages)
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printk(KERN_INFO "Using GB pages for direct mapping\n");
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else
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direct_gbpages = 0;
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#endif
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}
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struct map_range {
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unsigned long start;
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unsigned long end;
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unsigned page_size_mask;
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};
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static int page_size_mask;
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static void __init probe_page_size_mask(void)
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{
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init_gbpages();
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#if !defined(CONFIG_DEBUG_PAGEALLOC) && !defined(CONFIG_KMEMCHECK)
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/*
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* For CONFIG_DEBUG_PAGEALLOC, identity mapping will use small pages.
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* This will simplify cpa(), which otherwise needs to support splitting
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* large pages into small in interrupt context, etc.
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*/
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if (direct_gbpages)
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page_size_mask |= 1 << PG_LEVEL_1G;
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if (cpu_has_pse)
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page_size_mask |= 1 << PG_LEVEL_2M;
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#endif
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/* Enable PSE if available */
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if (cpu_has_pse)
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set_in_cr4(X86_CR4_PSE);
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/* Enable PGE if available */
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if (cpu_has_pge) {
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set_in_cr4(X86_CR4_PGE);
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__supported_pte_mask |= _PAGE_GLOBAL;
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}
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}
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#ifdef CONFIG_X86_32
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#define NR_RANGE_MR 3
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#else /* CONFIG_X86_64 */
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#define NR_RANGE_MR 5
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#endif
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static int __meminit save_mr(struct map_range *mr, int nr_range,
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unsigned long start_pfn, unsigned long end_pfn,
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unsigned long page_size_mask)
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{
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if (start_pfn < end_pfn) {
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if (nr_range >= NR_RANGE_MR)
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panic("run out of range for init_memory_mapping\n");
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mr[nr_range].start = start_pfn<<PAGE_SHIFT;
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mr[nr_range].end = end_pfn<<PAGE_SHIFT;
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mr[nr_range].page_size_mask = page_size_mask;
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nr_range++;
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}
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return nr_range;
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}
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/*
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* adjust the page_size_mask for small range to go with
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* big page size instead small one if nearby are ram too.
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*/
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static void __init_refok adjust_range_page_size_mask(struct map_range *mr,
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int nr_range)
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{
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int i;
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for (i = 0; i < nr_range; i++) {
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if ((page_size_mask & (1<<PG_LEVEL_2M)) &&
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!(mr[i].page_size_mask & (1<<PG_LEVEL_2M))) {
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unsigned long start = round_down(mr[i].start, PMD_SIZE);
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unsigned long end = round_up(mr[i].end, PMD_SIZE);
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#ifdef CONFIG_X86_32
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if ((end >> PAGE_SHIFT) > max_low_pfn)
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continue;
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#endif
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if (memblock_is_region_memory(start, end - start))
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mr[i].page_size_mask |= 1<<PG_LEVEL_2M;
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}
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if ((page_size_mask & (1<<PG_LEVEL_1G)) &&
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!(mr[i].page_size_mask & (1<<PG_LEVEL_1G))) {
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unsigned long start = round_down(mr[i].start, PUD_SIZE);
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unsigned long end = round_up(mr[i].end, PUD_SIZE);
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if (memblock_is_region_memory(start, end - start))
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mr[i].page_size_mask |= 1<<PG_LEVEL_1G;
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}
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}
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}
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static int __meminit split_mem_range(struct map_range *mr, int nr_range,
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unsigned long start,
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unsigned long end)
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{
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unsigned long start_pfn, end_pfn, limit_pfn;
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unsigned long pfn;
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int i;
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limit_pfn = PFN_DOWN(end);
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/* head if not big page alignment ? */
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pfn = start_pfn = PFN_DOWN(start);
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#ifdef CONFIG_X86_32
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/*
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* Don't use a large page for the first 2/4MB of memory
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* because there are often fixed size MTRRs in there
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* and overlapping MTRRs into large pages can cause
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* slowdowns.
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*/
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if (pfn == 0)
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end_pfn = PFN_DOWN(PMD_SIZE);
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else
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end_pfn = round_up(pfn, PFN_DOWN(PMD_SIZE));
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#else /* CONFIG_X86_64 */
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end_pfn = round_up(pfn, PFN_DOWN(PMD_SIZE));
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#endif
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if (end_pfn > limit_pfn)
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end_pfn = limit_pfn;
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if (start_pfn < end_pfn) {
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nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, 0);
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pfn = end_pfn;
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}
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/* big page (2M) range */
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start_pfn = round_up(pfn, PFN_DOWN(PMD_SIZE));
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#ifdef CONFIG_X86_32
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end_pfn = round_down(limit_pfn, PFN_DOWN(PMD_SIZE));
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#else /* CONFIG_X86_64 */
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end_pfn = round_up(pfn, PFN_DOWN(PUD_SIZE));
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if (end_pfn > round_down(limit_pfn, PFN_DOWN(PMD_SIZE)))
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end_pfn = round_down(limit_pfn, PFN_DOWN(PMD_SIZE));
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#endif
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if (start_pfn < end_pfn) {
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nr_range = save_mr(mr, nr_range, start_pfn, end_pfn,
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page_size_mask & (1<<PG_LEVEL_2M));
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pfn = end_pfn;
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}
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#ifdef CONFIG_X86_64
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/* big page (1G) range */
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start_pfn = round_up(pfn, PFN_DOWN(PUD_SIZE));
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end_pfn = round_down(limit_pfn, PFN_DOWN(PUD_SIZE));
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if (start_pfn < end_pfn) {
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nr_range = save_mr(mr, nr_range, start_pfn, end_pfn,
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page_size_mask &
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((1<<PG_LEVEL_2M)|(1<<PG_LEVEL_1G)));
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pfn = end_pfn;
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}
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/* tail is not big page (1G) alignment */
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start_pfn = round_up(pfn, PFN_DOWN(PMD_SIZE));
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end_pfn = round_down(limit_pfn, PFN_DOWN(PMD_SIZE));
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if (start_pfn < end_pfn) {
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nr_range = save_mr(mr, nr_range, start_pfn, end_pfn,
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page_size_mask & (1<<PG_LEVEL_2M));
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pfn = end_pfn;
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}
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#endif
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/* tail is not big page (2M) alignment */
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start_pfn = pfn;
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end_pfn = limit_pfn;
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nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, 0);
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/* try to merge same page size and continuous */
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for (i = 0; nr_range > 1 && i < nr_range - 1; i++) {
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unsigned long old_start;
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if (mr[i].end != mr[i+1].start ||
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mr[i].page_size_mask != mr[i+1].page_size_mask)
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continue;
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/* move it */
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old_start = mr[i].start;
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memmove(&mr[i], &mr[i+1],
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(nr_range - 1 - i) * sizeof(struct map_range));
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mr[i--].start = old_start;
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nr_range--;
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}
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if (!after_bootmem)
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adjust_range_page_size_mask(mr, nr_range);
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for (i = 0; i < nr_range; i++)
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printk(KERN_DEBUG " [mem %#010lx-%#010lx] page %s\n",
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mr[i].start, mr[i].end - 1,
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(mr[i].page_size_mask & (1<<PG_LEVEL_1G))?"1G":(
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(mr[i].page_size_mask & (1<<PG_LEVEL_2M))?"2M":"4k"));
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return nr_range;
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}
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struct range pfn_mapped[E820_X_MAX];
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int nr_pfn_mapped;
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static void add_pfn_range_mapped(unsigned long start_pfn, unsigned long end_pfn)
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{
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nr_pfn_mapped = add_range_with_merge(pfn_mapped, E820_X_MAX,
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nr_pfn_mapped, start_pfn, end_pfn);
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nr_pfn_mapped = clean_sort_range(pfn_mapped, E820_X_MAX);
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max_pfn_mapped = max(max_pfn_mapped, end_pfn);
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if (start_pfn < (1UL<<(32-PAGE_SHIFT)))
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max_low_pfn_mapped = max(max_low_pfn_mapped,
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min(end_pfn, 1UL<<(32-PAGE_SHIFT)));
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}
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bool pfn_range_is_mapped(unsigned long start_pfn, unsigned long end_pfn)
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{
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int i;
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for (i = 0; i < nr_pfn_mapped; i++)
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if ((start_pfn >= pfn_mapped[i].start) &&
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(end_pfn <= pfn_mapped[i].end))
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return true;
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return false;
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}
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/*
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* Setup the direct mapping of the physical memory at PAGE_OFFSET.
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* This runs before bootmem is initialized and gets pages directly from
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* the physical memory. To access them they are temporarily mapped.
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*/
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unsigned long __init_refok init_memory_mapping(unsigned long start,
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unsigned long end)
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{
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struct map_range mr[NR_RANGE_MR];
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unsigned long ret = 0;
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int nr_range, i;
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pr_info("init_memory_mapping: [mem %#010lx-%#010lx]\n",
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start, end - 1);
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memset(mr, 0, sizeof(mr));
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nr_range = split_mem_range(mr, 0, start, end);
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for (i = 0; i < nr_range; i++)
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ret = kernel_physical_mapping_init(mr[i].start, mr[i].end,
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mr[i].page_size_mask);
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add_pfn_range_mapped(start >> PAGE_SHIFT, ret >> PAGE_SHIFT);
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return ret >> PAGE_SHIFT;
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}
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/*
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* would have hole in the middle or ends, and only ram parts will be mapped.
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*/
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static unsigned long __init init_range_memory_mapping(
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unsigned long r_start,
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unsigned long r_end)
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{
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unsigned long start_pfn, end_pfn;
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unsigned long mapped_ram_size = 0;
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int i;
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for_each_mem_pfn_range(i, MAX_NUMNODES, &start_pfn, &end_pfn, NULL) {
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u64 start = clamp_val(PFN_PHYS(start_pfn), r_start, r_end);
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u64 end = clamp_val(PFN_PHYS(end_pfn), r_start, r_end);
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if (start >= end)
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continue;
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/*
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* if it is overlapping with brk pgt, we need to
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* alloc pgt buf from memblock instead.
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*/
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can_use_brk_pgt = max(start, (u64)pgt_buf_end<<PAGE_SHIFT) >=
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min(end, (u64)pgt_buf_top<<PAGE_SHIFT);
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init_memory_mapping(start, end);
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mapped_ram_size += end - start;
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can_use_brk_pgt = true;
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}
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return mapped_ram_size;
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}
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/* (PUD_SHIFT-PMD_SHIFT)/2 */
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#define STEP_SIZE_SHIFT 5
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void __init init_mem_mapping(void)
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{
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unsigned long end, real_end, start, last_start;
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unsigned long step_size;
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unsigned long addr;
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unsigned long mapped_ram_size = 0;
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unsigned long new_mapped_ram_size;
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probe_page_size_mask();
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#ifdef CONFIG_X86_64
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end = max_pfn << PAGE_SHIFT;
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#else
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end = max_low_pfn << PAGE_SHIFT;
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#endif
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/* the ISA range is always mapped regardless of memory holes */
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init_memory_mapping(0, ISA_END_ADDRESS);
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/* xen has big range in reserved near end of ram, skip it at first.*/
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addr = memblock_find_in_range(ISA_END_ADDRESS, end, PMD_SIZE, PMD_SIZE);
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real_end = addr + PMD_SIZE;
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/* step_size need to be small so pgt_buf from BRK could cover it */
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step_size = PMD_SIZE;
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max_pfn_mapped = 0; /* will get exact value next */
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min_pfn_mapped = real_end >> PAGE_SHIFT;
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last_start = start = real_end;
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while (last_start > ISA_END_ADDRESS) {
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if (last_start > step_size) {
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start = round_down(last_start - 1, step_size);
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if (start < ISA_END_ADDRESS)
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start = ISA_END_ADDRESS;
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} else
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start = ISA_END_ADDRESS;
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new_mapped_ram_size = init_range_memory_mapping(start,
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last_start);
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last_start = start;
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min_pfn_mapped = last_start >> PAGE_SHIFT;
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/* only increase step_size after big range get mapped */
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if (new_mapped_ram_size > mapped_ram_size)
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step_size <<= STEP_SIZE_SHIFT;
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mapped_ram_size += new_mapped_ram_size;
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}
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if (real_end < end)
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init_range_memory_mapping(real_end, end);
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|
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#ifdef CONFIG_X86_64
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if (max_pfn > max_low_pfn) {
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/* can we preseve max_low_pfn ?*/
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max_low_pfn = max_pfn;
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}
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#else
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early_ioremap_page_table_range_init();
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#endif
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load_cr3(swapper_pg_dir);
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__flush_tlb_all();
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early_memtest(0, max_pfn_mapped << PAGE_SHIFT);
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}
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/*
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* devmem_is_allowed() checks to see if /dev/mem access to a certain address
|
|
* is valid. The argument is a physical page number.
|
|
*
|
|
*
|
|
* On x86, access has to be given to the first megabyte of ram because that area
|
|
* contains bios code and data regions used by X and dosemu and similar apps.
|
|
* Access has to be given to non-kernel-ram areas as well, these contain the PCI
|
|
* mmio resources as well as potential bios/acpi data regions.
|
|
*/
|
|
int devmem_is_allowed(unsigned long pagenr)
|
|
{
|
|
if (pagenr < 256)
|
|
return 1;
|
|
if (iomem_is_exclusive(pagenr << PAGE_SHIFT))
|
|
return 0;
|
|
if (!page_is_ram(pagenr))
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
void free_init_pages(char *what, unsigned long begin, unsigned long end)
|
|
{
|
|
unsigned long addr;
|
|
unsigned long begin_aligned, end_aligned;
|
|
|
|
/* Make sure boundaries are page aligned */
|
|
begin_aligned = PAGE_ALIGN(begin);
|
|
end_aligned = end & PAGE_MASK;
|
|
|
|
if (WARN_ON(begin_aligned != begin || end_aligned != end)) {
|
|
begin = begin_aligned;
|
|
end = end_aligned;
|
|
}
|
|
|
|
if (begin >= end)
|
|
return;
|
|
|
|
addr = begin;
|
|
|
|
/*
|
|
* If debugging page accesses then do not free this memory but
|
|
* mark them not present - any buggy init-section access will
|
|
* create a kernel page fault:
|
|
*/
|
|
#ifdef CONFIG_DEBUG_PAGEALLOC
|
|
printk(KERN_INFO "debug: unmapping init [mem %#010lx-%#010lx]\n",
|
|
begin, end - 1);
|
|
set_memory_np(begin, (end - begin) >> PAGE_SHIFT);
|
|
#else
|
|
/*
|
|
* We just marked the kernel text read only above, now that
|
|
* we are going to free part of that, we need to make that
|
|
* writeable and non-executable first.
|
|
*/
|
|
set_memory_nx(begin, (end - begin) >> PAGE_SHIFT);
|
|
set_memory_rw(begin, (end - begin) >> PAGE_SHIFT);
|
|
|
|
printk(KERN_INFO "Freeing %s: %luk freed\n", what, (end - begin) >> 10);
|
|
|
|
for (; addr < end; addr += PAGE_SIZE) {
|
|
ClearPageReserved(virt_to_page(addr));
|
|
init_page_count(virt_to_page(addr));
|
|
memset((void *)addr, POISON_FREE_INITMEM, PAGE_SIZE);
|
|
free_page(addr);
|
|
totalram_pages++;
|
|
}
|
|
#endif
|
|
}
|
|
|
|
void free_initmem(void)
|
|
{
|
|
free_init_pages("unused kernel memory",
|
|
(unsigned long)(&__init_begin),
|
|
(unsigned long)(&__init_end));
|
|
}
|
|
|
|
#ifdef CONFIG_BLK_DEV_INITRD
|
|
void __init free_initrd_mem(unsigned long start, unsigned long end)
|
|
{
|
|
#ifdef CONFIG_MICROCODE_EARLY
|
|
/*
|
|
* Remember, initrd memory may contain microcode or other useful things.
|
|
* Before we lose initrd mem, we need to find a place to hold them
|
|
* now that normal virtual memory is enabled.
|
|
*/
|
|
save_microcode_in_initrd();
|
|
#endif
|
|
|
|
/*
|
|
* end could be not aligned, and We can not align that,
|
|
* decompresser could be confused by aligned initrd_end
|
|
* We already reserve the end partial page before in
|
|
* - i386_start_kernel()
|
|
* - x86_64_start_kernel()
|
|
* - relocate_initrd()
|
|
* So here We can do PAGE_ALIGN() safely to get partial page to be freed
|
|
*/
|
|
free_init_pages("initrd memory", start, PAGE_ALIGN(end));
|
|
}
|
|
#endif
|
|
|
|
void __init zone_sizes_init(void)
|
|
{
|
|
unsigned long max_zone_pfns[MAX_NR_ZONES];
|
|
|
|
memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
|
|
|
|
#ifdef CONFIG_ZONE_DMA
|
|
max_zone_pfns[ZONE_DMA] = MAX_DMA_PFN;
|
|
#endif
|
|
#ifdef CONFIG_ZONE_DMA32
|
|
max_zone_pfns[ZONE_DMA32] = MAX_DMA32_PFN;
|
|
#endif
|
|
max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
|
|
#ifdef CONFIG_HIGHMEM
|
|
max_zone_pfns[ZONE_HIGHMEM] = max_pfn;
|
|
#endif
|
|
|
|
free_area_init_nodes(max_zone_pfns);
|
|
}
|
|
|