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| author | Shaohua Li <shaohua.li@intel.com> | 2008-08-04 06:51:30 (GMT) |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-08-15 14:30:48 (GMT) |
| commit | 466ae837424dcc538b1af2a0eaf53be32edcdbe7 (patch) | |
| tree | fb19282470b844aa6e1affc52b65dd707196d223 | |
| parent | 1ac2f7d55b7ee1613c90631e87fea22ec06781e5 (diff) | |
| download | linux-466ae837424dcc538b1af2a0eaf53be32edcdbe7.tar.xz | |
reduce tlb/cache flush times of agpgart memory allocation
To reduce tlb/cache flush, makes agp memory allocation do one flush
after all pages in a region are changed to uc.
All agp drivers except agp-sgi uses agp_generic_alloc_page()
for .agp_alloc_page, so the patch should work for them. agp-sgi is only
for ia64, so not a problem too.
Signed-off-by: Shaohua Li <shaohua.li@intel.com>
Cc: airlied@linux.ie
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Arjan van de Ven <arjan@infradead.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
| -rw-r--r-- | drivers/char/agp/agp.h | 4 | ||||
| -rw-r--r-- | drivers/char/agp/generic.c | 4 | ||||
| -rw-r--r-- | include/asm-x86/agp.h | 3 |
3 files changed, 10 insertions, 1 deletions
diff --git a/drivers/char/agp/agp.h b/drivers/char/agp/agp.h index 81e14be..395168f 100644 --- a/drivers/char/agp/agp.h +++ b/drivers/char/agp/agp.h @@ -30,6 +30,10 @@ #define _AGP_BACKEND_PRIV_H 1 #include <asm/agp.h> /* for flush_agp_cache() */ +#ifndef map_page_into_agp_noflush +#define map_page_into_agp_noflush(page) map_page_into_agp(page) +#define map_page_into_agp_global_flush() +#endif #define PFX "agpgart: " diff --git a/drivers/char/agp/generic.c b/drivers/char/agp/generic.c index eaa1a35..bf239b8 100644 --- a/drivers/char/agp/generic.c +++ b/drivers/char/agp/generic.c @@ -274,6 +274,7 @@ struct agp_memory *agp_allocate_memory(struct agp_bridge_data *bridge, new->memory[i] = virt_to_gart(addr); new->page_count++; } + map_page_into_agp_global_flush(); new->bridge = bridge; return new; @@ -1186,7 +1187,8 @@ void *agp_generic_alloc_page(struct agp_bridge_data *bridge) if (page == NULL) return NULL; - map_page_into_agp(page); + /* agp_allocate_memory will do flush */ + map_page_into_agp_noflush(page); get_page(page); atomic_inc(&agp_bridge->current_memory_agp); diff --git a/include/asm-x86/agp.h b/include/asm-x86/agp.h index e4004a9..181b9e9 100644 --- a/include/asm-x86/agp.h +++ b/include/asm-x86/agp.h @@ -15,6 +15,9 @@ #define map_page_into_agp(page) set_pages_uc(page, 1) #define unmap_page_from_agp(page) set_pages_wb(page, 1) +#define map_page_into_agp_noflush(page) set_pages_uc_noflush(page, 1) +#define map_page_into_agp_global_flush() set_memory_flush_all() + /* * Could use CLFLUSH here if the cpu supports it. But then it would * need to be called for each cacheline of the whole page so it may |