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| author | Pekka Paalanen | 2008-05-12 21:20:56 +0200 |
|---|---|---|
| committer | Thomas Gleixner | 2008-05-24 11:21:32 +0200 |
| commit | 75bb88350e0501b3cf5ac096a1008757844414a9 (patch) | |
| tree | 13b836138e77455fa0f188a01c0a10b641ddc266 /arch/x86/kernel/mmiotrace/kmmio.c | |
| parent | x86: mmiotrace - trace memory mapped IO (diff) | |
| download | kernel-qcow2-linux-75bb88350e0501b3cf5ac096a1008757844414a9.tar.gz kernel-qcow2-linux-75bb88350e0501b3cf5ac096a1008757844414a9.tar.xz kernel-qcow2-linux-75bb88350e0501b3cf5ac096a1008757844414a9.zip | |
x86 mmiotrace: use lookup_address()
Use lookup_address() from pageattr.c instead of doing the same
manually. Also had to EXPORT_SYMBOL_GPL(lookup_address) to make this
work for modules. This also fixes "undefined symbol 'init_mm'"
compile error for x86_32.
Signed-off-by: Pekka Paalanen <pq@iki.fi>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'arch/x86/kernel/mmiotrace/kmmio.c')
| -rw-r--r-- | arch/x86/kernel/mmiotrace/kmmio.c | 46 |
1 files changed, 31 insertions, 15 deletions
diff --git a/arch/x86/kernel/mmiotrace/kmmio.c b/arch/x86/kernel/mmiotrace/kmmio.c index 8ba48f9c91b4..28411dadb8b3 100644 --- a/arch/x86/kernel/mmiotrace/kmmio.c +++ b/arch/x86/kernel/mmiotrace/kmmio.c @@ -20,6 +20,7 @@ #include <asm/cacheflush.h> #include <asm/errno.h> #include <asm/tlbflush.h> +#include <asm/pgtable.h> #include "kmmio.h" @@ -117,40 +118,55 @@ static struct kmmio_fault_page *get_kmmio_fault_page(unsigned long page) return NULL; } -static void arm_kmmio_fault_page(unsigned long page, int *large) +static void arm_kmmio_fault_page(unsigned long page, int *page_level) { unsigned long address = page & PAGE_MASK; - pgd_t *pgd = pgd_offset_k(address); - pud_t *pud = pud_offset(pgd, address); - pmd_t *pmd = pmd_offset(pud, address); - pte_t *pte = pte_offset_kernel(pmd, address); + int level; + pte_t *pte = lookup_address(address, &level); - if (pmd_large(*pmd)) { + if (!pte) { + printk(KERN_ERR "Error in %s: no pte for page 0x%08lx\n", + __FUNCTION__, page); + return; + } + + if (level == PG_LEVEL_2M) { + pmd_t *pmd = (pmd_t *)pte; set_pmd(pmd, __pmd(pmd_val(*pmd) & ~_PAGE_PRESENT)); - if (large) - *large = 1; } else { + /* PG_LEVEL_4K */ set_pte(pte, __pte(pte_val(*pte) & ~_PAGE_PRESENT)); } + if (page_level) + *page_level = level; + __flush_tlb_one(page); } -static void disarm_kmmio_fault_page(unsigned long page, int *large) +static void disarm_kmmio_fault_page(unsigned long page, int *page_level) { unsigned long address = page & PAGE_MASK; - pgd_t *pgd = pgd_offset_k(address); - pud_t *pud = pud_offset(pgd, address); - pmd_t *pmd = pmd_offset(pud, address); - pte_t *pte = pte_offset_kernel(pmd, address); + int level; + pte_t *pte = lookup_address(address, &level); - if (large && *large) { + if (!pte) { + printk(KERN_ERR "Error in %s: no pte for page 0x%08lx\n", + __FUNCTION__, page); + return; + } + + if (level == PG_LEVEL_2M) { + pmd_t *pmd = (pmd_t *)pte; set_pmd(pmd, __pmd(pmd_val(*pmd) | _PAGE_PRESENT)); - *large = 0; } else { + /* PG_LEVEL_4K */ set_pte(pte, __pte(pte_val(*pte) | _PAGE_PRESENT)); } + if (page_level) + *page_level = level; + __flush_tlb_one(page); } |