diff options
| author | Catalin Marinas <catalin.marinas@arm.com> | 2010-08-09 10:32:46 +0100 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2010-08-09 10:32:46 +0100 |
| commit | 1c8c36795c1090a3c04be8c6ac4e23c5681eb86d (patch) | |
| tree | 3c179c577d2f2d68c2fe96979c6fdf2ba34efb3e /arch | |
| parent | cbb8d1ea62c479e925ebc7c6d03fc7aee0566641 (diff) | |
ARM: Implement phys_mem_access_prot() to avoid attributes aliasing
ARMv7 onwards requires that there are no aliases to the same physical
location using different memory types (i.e. Normal vs Strongly Ordered).
Access to SO mappings when the unaligned accesses are handled in
hardware is also Unpredictable (pgprot_noncached() mappings in user
space).
The /dev/mem driver requires uncached mappings with O_SYNC. The patch
implements the phys_mem_access_prot() function which generates Strongly
Ordered memory attributes if !pfn_valid() (independent of O_SYNC) and
Normal Noncacheable (writecombine) if O_SYNC.
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/include/asm/pgtable.h | 3 | ||||
| -rw-r--r-- | arch/arm/mm/mmu.c | 14 |
2 files changed, 17 insertions, 0 deletions
diff --git a/arch/arm/include/asm/pgtable.h b/arch/arm/include/asm/pgtable.h index 42e694f1d58..ea19775fa53 100644 --- a/arch/arm/include/asm/pgtable.h +++ b/arch/arm/include/asm/pgtable.h @@ -337,6 +337,9 @@ static inline pte_t pte_mkspecial(pte_t pte) { return pte; } #ifdef CONFIG_ARM_DMA_MEM_BUFFERABLE #define pgprot_dmacoherent(prot) \ __pgprot_modify(prot, L_PTE_MT_MASK|L_PTE_EXEC, L_PTE_MT_BUFFERABLE) +#define __HAVE_PHYS_MEM_ACCESS_PROT +extern pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn, + unsigned long size, pgprot_t vma_prot); #else #define pgprot_dmacoherent(prot) \ __pgprot_modify(prot, L_PTE_MT_MASK|L_PTE_EXEC, L_PTE_MT_UNCACHED) diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c index 28589417118..b18884890de 100644 --- a/arch/arm/mm/mmu.c +++ b/arch/arm/mm/mmu.c @@ -15,6 +15,7 @@ #include <linux/mman.h> #include <linux/nodemask.h> #include <linux/sort.h> +#include <linux/fs.h> #include <asm/cputype.h> #include <asm/mach-types.h> @@ -486,6 +487,19 @@ static void __init build_mem_type_table(void) } } +#ifdef CONFIG_ARM_DMA_MEM_BUFFERABLE +pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn, + unsigned long size, pgprot_t vma_prot) +{ + if (!pfn_valid(pfn)) + return pgprot_noncached(vma_prot); + else if (file->f_flags & O_SYNC) + return pgprot_writecombine(vma_prot); + return vma_prot; +} +EXPORT_SYMBOL(phys_mem_access_prot); +#endif + #define vectors_base() (vectors_high() ? 0xffff0000 : 0) static void __init alloc_init_pte(pmd_t *pmd, unsigned long addr, |