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| author | Max Filippov <jcmvbkbc@gmail.com> | 2014-07-15 02:51:49 +0400 |
|---|---|---|
| committer | Max Filippov <jcmvbkbc@gmail.com> | 2014-08-14 11:59:21 +0400 |
| commit | 32544d9c10c42bac3be8b87d2fc95b0aef008795 (patch) | |
| tree | 11983adf6b934cc71ba3013623d8869c867b49fd /arch/xtensa | |
| parent | a91902db2990909ea5e6b110811b448f2e8f1571 (diff) | |
| download | linux-32544d9c10c42bac3be8b87d2fc95b0aef008795.tar.gz linux-32544d9c10c42bac3be8b87d2fc95b0aef008795.tar.bz2 linux-32544d9c10c42bac3be8b87d2fc95b0aef008795.zip | |
xtensa: support aliasing cache in k[un]map_atomic
Map high memory pages at virtual addresses with color that match color
of their physical address. Existing cache alias management mechanisms
may be used with such pages.
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Diffstat (limited to 'arch/xtensa')
| -rw-r--r-- | arch/xtensa/include/asm/fixmap.h | 3 | ||||
| -rw-r--r-- | arch/xtensa/include/asm/page.h | 2 | ||||
| -rw-r--r-- | arch/xtensa/mm/highmem.c | 17 |
3 files changed, 14 insertions, 8 deletions
diff --git a/arch/xtensa/include/asm/fixmap.h b/arch/xtensa/include/asm/fixmap.h index a43cd5265556..62b507deea9d 100644 --- a/arch/xtensa/include/asm/fixmap.h +++ b/arch/xtensa/include/asm/fixmap.h @@ -38,7 +38,8 @@ enum fixed_addresses { #ifdef CONFIG_HIGHMEM /* reserved pte's for temporary kernel mappings */ FIX_KMAP_BEGIN, - FIX_KMAP_END = FIX_KMAP_BEGIN + (KM_TYPE_NR * NR_CPUS) - 1, + FIX_KMAP_END = FIX_KMAP_BEGIN + + (KM_TYPE_NR * NR_CPUS * DCACHE_N_COLORS) - 1, #endif __end_of_fixed_addresses }; diff --git a/arch/xtensa/include/asm/page.h b/arch/xtensa/include/asm/page.h index 11721ccd7f23..abe24c6f8b2f 100644 --- a/arch/xtensa/include/asm/page.h +++ b/arch/xtensa/include/asm/page.h @@ -78,7 +78,9 @@ # define DCACHE_ALIAS_EQ(a,b) ((((a) ^ (b)) & DCACHE_ALIAS_MASK) == 0) #else # define DCACHE_ALIAS_ORDER 0 +# define DCACHE_ALIAS(a) ((void)(a), 0) #endif +#define DCACHE_N_COLORS (1 << DCACHE_ALIAS_ORDER) #if ICACHE_WAY_SIZE > PAGE_SIZE # define ICACHE_ALIAS_ORDER (ICACHE_WAY_SHIFT - PAGE_SHIFT) diff --git a/arch/xtensa/mm/highmem.c b/arch/xtensa/mm/highmem.c index 2e95a7665bf3..466abaed5382 100644 --- a/arch/xtensa/mm/highmem.c +++ b/arch/xtensa/mm/highmem.c @@ -14,18 +14,23 @@ static pte_t *kmap_pte; +static inline enum fixed_addresses kmap_idx(int type, unsigned long color) +{ + return (type + KM_TYPE_NR * smp_processor_id()) * DCACHE_N_COLORS + + color; +} + void *kmap_atomic(struct page *page) { enum fixed_addresses idx; unsigned long vaddr; - int type; pagefault_disable(); if (!PageHighMem(page)) return page_address(page); - type = kmap_atomic_idx_push(); - idx = type + KM_TYPE_NR * smp_processor_id(); + idx = kmap_idx(kmap_atomic_idx_push(), + DCACHE_ALIAS(page_to_phys(page))); vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx); #ifdef CONFIG_DEBUG_HIGHMEM BUG_ON(!pte_none(*(kmap_pte + idx))); @@ -38,12 +43,10 @@ EXPORT_SYMBOL(kmap_atomic); void __kunmap_atomic(void *kvaddr) { - int idx, type; - if (kvaddr >= (void *)FIXADDR_START && kvaddr < (void *)FIXADDR_TOP) { - type = kmap_atomic_idx(); - idx = type + KM_TYPE_NR * smp_processor_id(); + int idx = kmap_idx(kmap_atomic_idx(), + DCACHE_ALIAS((unsigned long)kvaddr)); /* * Force other mappings to Oops if they'll try to access this |