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xtensa: support aliasing cache in kmap

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Define ARCH_PKMAP_COLORING and provide corresponding macro definitions
on cores with aliasing data cache.

Instead of single last_pkmap_nr maintain an array last_pkmap_nr_arr of
pkmap counters for each page color. Make sure that kmap maps physical
page at virtual address with color matching its physical address.

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
This commit is contained in:
Max Filippov
2014-07-17 05:04:49 +04:00
parent 32544d9c10
commit 8504b503df
2 changed files with 56 additions and 2 deletions
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18
arch/xtensa/mm/highmem.c
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@@ -14,6 +14,23 @@
static pte_t *kmap_pte;
#if DCACHE_WAY_SIZE > PAGE_SIZE
unsigned int last_pkmap_nr_arr[DCACHE_N_COLORS];
wait_queue_head_t pkmap_map_wait_arr[DCACHE_N_COLORS];
static void __init kmap_waitqueues_init(void)
{
unsigned int i;
for (i = 0; i < ARRAY_SIZE(pkmap_map_wait_arr); ++i)
init_waitqueue_head(pkmap_map_wait_arr + i);
}
#else
static inline void kmap_waitqueues_init(void)
{
}
#endif
static inline enum fixed_addresses kmap_idx(int type, unsigned long color)
{
return (type + KM_TYPE_NR * smp_processor_id()) * DCACHE_N_COLORS +
@@ -72,4 +89,5 @@ void __init kmap_init(void)
/* cache the first kmap pte */
kmap_vstart = __fix_to_virt(FIX_KMAP_BEGIN);
kmap_pte = kmap_get_fixmap_pte(kmap_vstart);
kmap_waitqueues_init();
}