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authorShaohua Li <shaohua.li@intel.com>2008-08-04 14:51:30 +0800
committerIngo Molnar <mingo@elte.hu>2008-08-15 16:30:48 +0200
commit466ae837424dcc538b1af2a0eaf53be32edcdbe7 (patch)
treefb19282470b844aa6e1affc52b65dd707196d223 /drivers/char
parent1ac2f7d55b7ee1613c90631e87fea22ec06781e5 (diff)
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>
Diffstat (limited to 'drivers/char')
-rw-r--r--drivers/char/agp/agp.h4
-rw-r--r--drivers/char/agp/generic.c4
2 files changed, 7 insertions, 1 deletions
diff --git a/drivers/char/agp/agp.h b/drivers/char/agp/agp.h
index 81e14bea54bd..395168fb17e3 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 eaa1a355bb32..bf239b8ecac5 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);