From a3c6018e565dc07cf3738ace6bbe412f97b1bba8 Mon Sep 17 00:00:00 2001 From: Jan Beulich Date: Fri, 16 Jan 2009 11:59:33 +0000 Subject: [PATCH] x86: fix assumed to be contiguous leaf page tables for kmap_atomic region (take 2) Debugging and original patch from Nick Piggin The early fixmap pmd entry inserted at the very top of the KVA is causing the subsequent fixmap mapping code to not provide physically linear pte pages over the kmap atomic portion of the fixmap (which relies on said property to calculate pte addresses). This has caused weird boot failures in kmap_atomic much later in the boot process (initial userspace faults) on a 32-bit PAE system with a larger number of CPUs (smaller CPU counts tend not to run over into the next page so don't show up the problem). Solve this by attempting to clear out the page table, and copy any of its entries to the new one. Also, add a bug if a nonlinear condition is encountered and can't be resolved, which might save some hours of debugging if this fragile scheme ever breaks again... Once we have such logic, we can also use it to eliminate the early ioremap trickery around the page table setup for the fixmap area. This also fixes potential issues with FIX_* entries sharing the leaf page table with the early ioremap ones getting discarded by early_ioremap_clear() and not restored by early_ioremap_reset(). It at once eliminates the temporary (and configuration, namely NR_CPUS, dependent) unavailability of early fixed mappings during the time the fixmap area page tables get constructed. Finally, also replace the hard coded calculation of the initial table space needed for the fixmap area with a proper one, allowing kernels configured for large CPU counts to actually boot. Based-on: Nick Piggin Signed-off-by: Jan Beulich Signed-off-by: Ingo Molnar --- arch/x86/include/asm/io.h | 1 - arch/x86/mm/init_32.c | 48 ++++++++++++++++++++++++++++++++++++--- arch/x86/mm/ioremap.c | 25 -------------------- 3 files changed, 45 insertions(+), 29 deletions(-) diff --git a/arch/x86/include/asm/io.h b/arch/x86/include/asm/io.h index 05cfed4485f..1dbbdf4be9b 100644 --- a/arch/x86/include/asm/io.h +++ b/arch/x86/include/asm/io.h @@ -99,7 +99,6 @@ extern void __iomem *ioremap_wc(unsigned long offset, unsigned long size); * A boot-time mapping is currently limited to at most 16 pages. */ extern void early_ioremap_init(void); -extern void early_ioremap_clear(void); extern void early_ioremap_reset(void); extern void __iomem *early_ioremap(unsigned long offset, unsigned long size); extern void __iomem *early_memremap(unsigned long offset, unsigned long size); diff --git a/arch/x86/mm/init_32.c b/arch/x86/mm/init_32.c index 88f1b10de3b..2cef0507441 100644 --- a/arch/x86/mm/init_32.c +++ b/arch/x86/mm/init_32.c @@ -138,6 +138,47 @@ static pte_t * __init one_page_table_init(pmd_t *pmd) return pte_offset_kernel(pmd, 0); } +static pte_t *__init page_table_kmap_check(pte_t *pte, pmd_t *pmd, + unsigned long vaddr, pte_t *lastpte) +{ +#ifdef CONFIG_HIGHMEM + /* + * Something (early fixmap) may already have put a pte + * page here, which causes the page table allocation + * to become nonlinear. Attempt to fix it, and if it + * is still nonlinear then we have to bug. + */ + int pmd_idx_kmap_begin = fix_to_virt(FIX_KMAP_END) >> PMD_SHIFT; + int pmd_idx_kmap_end = fix_to_virt(FIX_KMAP_BEGIN) >> PMD_SHIFT; + + if (pmd_idx_kmap_begin != pmd_idx_kmap_end + && (vaddr >> PMD_SHIFT) >= pmd_idx_kmap_begin + && (vaddr >> PMD_SHIFT) <= pmd_idx_kmap_end + && ((__pa(pte) >> PAGE_SHIFT) < table_start + || (__pa(pte) >> PAGE_SHIFT) >= table_end)) { + pte_t *newpte; + int i; + + BUG_ON(after_init_bootmem); + newpte = alloc_low_page(); + for (i = 0; i < PTRS_PER_PTE; i++) + set_pte(newpte + i, pte[i]); + + paravirt_alloc_pte(&init_mm, __pa(newpte) >> PAGE_SHIFT); + set_pmd(pmd, __pmd(__pa(newpte)|_PAGE_TABLE)); + BUG_ON(newpte != pte_offset_kernel(pmd, 0)); + __flush_tlb_all(); + + paravirt_release_pte(__pa(pte) >> PAGE_SHIFT); + pte = newpte; + } + BUG_ON(vaddr < fix_to_virt(FIX_KMAP_BEGIN - 1) + && vaddr > fix_to_virt(FIX_KMAP_END) + && lastpte && lastpte + PTRS_PER_PTE != pte); +#endif + return pte; +} + /* * This function initializes a certain range of kernel virtual memory * with new bootmem page tables, everywhere page tables are missing in @@ -154,6 +195,7 @@ page_table_range_init(unsigned long start, unsigned long end, pgd_t *pgd_base) unsigned long vaddr; pgd_t *pgd; pmd_t *pmd; + pte_t *pte = NULL; vaddr = start; pgd_idx = pgd_index(vaddr); @@ -165,7 +207,8 @@ page_table_range_init(unsigned long start, unsigned long end, pgd_t *pgd_base) pmd = pmd + pmd_index(vaddr); for (; (pmd_idx < PTRS_PER_PMD) && (vaddr != end); pmd++, pmd_idx++) { - one_page_table_init(pmd); + pte = page_table_kmap_check(one_page_table_init(pmd), + pmd, vaddr, pte); vaddr += PMD_SIZE; } @@ -508,7 +551,6 @@ static void __init early_ioremap_page_table_range_init(pgd_t *pgd_base) * Fixed mappings, only the page table structure has to be * created - mappings will be set by set_fixmap(): */ - early_ioremap_clear(); vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK; end = (FIXADDR_TOP + PMD_SIZE - 1) & PMD_MASK; page_table_range_init(vaddr, end, pgd_base); @@ -801,7 +843,7 @@ static void __init find_early_table_space(unsigned long end, int use_pse) tables += PAGE_ALIGN(ptes * sizeof(pte_t)); /* for fixmap */ - tables += PAGE_SIZE * 2; + tables += PAGE_ALIGN(__end_of_fixed_addresses * sizeof(pte_t)); /* * RED-PEN putting page tables only on node 0 could diff --git a/arch/x86/mm/ioremap.c b/arch/x86/mm/ioremap.c index bd85d42819e..af750ab973b 100644 --- a/arch/x86/mm/ioremap.c +++ b/arch/x86/mm/ioremap.c @@ -557,34 +557,9 @@ void __init early_ioremap_init(void) } } -void __init early_ioremap_clear(void) -{ - pmd_t *pmd; - - if (early_ioremap_debug) - printk(KERN_INFO "early_ioremap_clear()\n"); - - pmd = early_ioremap_pmd(fix_to_virt(FIX_BTMAP_BEGIN)); - pmd_clear(pmd); - paravirt_release_pte(__pa(bm_pte) >> PAGE_SHIFT); - __flush_tlb_all(); -} - void __init early_ioremap_reset(void) { - enum fixed_addresses idx; - unsigned long addr, phys; - pte_t *pte; - after_paging_init = 1; - for (idx = FIX_BTMAP_BEGIN; idx >= FIX_BTMAP_END; idx--) { - addr = fix_to_virt(idx); - pte = early_ioremap_pte(addr); - if (pte_present(*pte)) { - phys = pte_val(*pte) & PAGE_MASK; - set_fixmap(idx, phys); - } - } } static void __init __early_set_fixmap(enum fixed_addresses idx, -- 2.41.1