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xtensa: support aliasing cache in kmap 

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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40
arch/xtensa/include/asm/highmem.h
View File

@ -12,19 +12,55 @@
#ifndef _XTENSA_HIGHMEM_H
#define _XTENSA_HIGHMEM_H
#include <linux/wait.h>
#include <asm/cacheflush.h>
#include <asm/fixmap.h>
#include <asm/kmap_types.h>
#include <asm/pgtable.h>
#define PKMAP_BASE (FIXADDR_START - PMD_SIZE)
#define LAST_PKMAP PTRS_PER_PTE
#define PKMAP_BASE ((FIXADDR_START - \
(LAST_PKMAP + 1) * PAGE_SIZE) & PMD_MASK)
#define LAST_PKMAP (PTRS_PER_PTE * DCACHE_N_COLORS)
#define LAST_PKMAP_MASK (LAST_PKMAP - 1)
#define PKMAP_NR(virt) (((virt) - PKMAP_BASE) >> PAGE_SHIFT)
#define PKMAP_ADDR(nr) (PKMAP_BASE + ((nr) << PAGE_SHIFT))
#define kmap_prot PAGE_KERNEL
#if DCACHE_WAY_SIZE > PAGE_SIZE
#define get_pkmap_color get_pkmap_color
static inline int get_pkmap_color(struct page *page)
{
return DCACHE_ALIAS(page_to_phys(page));
}
extern unsigned int last_pkmap_nr_arr[];
static inline unsigned int get_next_pkmap_nr(unsigned int color)
{
last_pkmap_nr_arr[color] =
(last_pkmap_nr_arr[color] + DCACHE_N_COLORS) & LAST_PKMAP_MASK;
return last_pkmap_nr_arr[color] + color;
}
static inline int no_more_pkmaps(unsigned int pkmap_nr, unsigned int color)
{
return pkmap_nr < DCACHE_N_COLORS;
}
static inline int get_pkmap_entries_count(unsigned int color)
{
return LAST_PKMAP / DCACHE_N_COLORS;
}
extern wait_queue_head_t pkmap_map_wait_arr[];
static inline wait_queue_head_t *get_pkmap_wait_queue_head(unsigned int color)
{
return pkmap_map_wait_arr + color;
}
#endif
extern pte_t *pkmap_page_table;
void *kmap_high(struct page *page);

18
arch/xtensa/mm/highmem.c
View File

@ -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();
}