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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/mm | |
| parent | a91902db2990909ea5e6b110811b448f2e8f1571 (diff) | |
| download | linux-32544d9c10c42bac3be8b87d2fc95b0aef008795.tar.xz | |
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/mm')
| -rw-r--r-- | arch/xtensa/mm/highmem.c | 17 |
1 files changed, 10 insertions, 7 deletions
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 |