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drm/i915: add driver cache flush entry point

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Use clflush on Intel hardware to flush cached objects.
This commit is contained in:
Dave Airlie 2007-10-30 17:51:59 +10:00 • committed by Dave Airlie
parent ff5889f831
commit 50dec29c80
5 changed files with 41 additions and 3 deletions
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1
linux-core/drm_objects.h
View file

@ -464,6 +464,7 @@ struct drm_bo_driver {
uint32_t(*evict_mask) (struct drm_buffer_object *bo);
int (*move) (struct drm_buffer_object * bo,
int evict, int no_wait, struct drm_bo_mem_reg * new_mem);
void (*ttm_cache_flush)(struct drm_ttm *ttm);
};
/*

7
linux-core/drm_ttm.c
View file

@ -207,6 +207,7 @@ struct page *drm_ttm_get_page(struct drm_ttm * ttm, int index)
}
return p;
}
EXPORT_SYMBOL(drm_ttm_get_page);
int drm_ttm_populate(struct drm_ttm * ttm)
{
@ -311,7 +312,7 @@ void drm_ttm_unbind(struct drm_ttm * ttm)
int drm_bind_ttm(struct drm_ttm * ttm, struct drm_bo_mem_reg *bo_mem)
{
struct drm_bo_driver *bo_driver = ttm->dev->driver->bo_driver;
int ret = 0;
struct drm_ttm_backend *be;
@ -328,7 +329,9 @@ int drm_bind_ttm(struct drm_ttm * ttm, struct drm_bo_mem_reg *bo_mem)
if (ttm->state == ttm_unbound && !(bo_mem->flags & DRM_BO_FLAG_CACHED)) {
drm_set_caching(ttm, DRM_TTM_PAGE_UNCACHED);
}
} else if ((bo_mem->flags & DRM_BO_FLAG_CACHED) &&
bo_driver->ttm_cache_flush)
bo_driver->ttm_cache_flush(ttm);
if ((ret = be->func->bind(be, bo_mem))) {
ttm->state = ttm_evicted;

33
linux-core/i915_buffer.c
View file

@ -249,3 +249,36 @@ int i915_move(struct drm_buffer_object * bo,
}
return 0;
}
#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,24))
static inline void clflush(volatile void *__p)
{
asm volatile("clflush %0" : "+m" (*(char __force *)__p));
}
#endif
static inline void drm_cache_flush_addr(void *virt)
{
int i;
for (i = 0; i < PAGE_SIZE; i += boot_cpu_data.x86_clflush_size)
clflush(virt+i);
}
static inline void drm_cache_flush_page(struct page *p)
{
drm_cache_flush_addr(page_address(p));
}
void i915_flush_ttm(struct drm_ttm *ttm)
{
int i;
if (!ttm)
return;
DRM_MEMORYBARRIER();
for (i = ttm->num_pages-1; i >= 0; i--)
drm_cache_flush_page(drm_ttm_get_page(ttm, i));
DRM_MEMORYBARRIER();
}

1
linux-core/i915_drv.c
View file

@ -66,6 +66,7 @@ static struct drm_bo_driver i915_bo_driver = {
.init_mem_type = i915_init_mem_type,
.evict_mask = i915_evict_mask,
.move = i915_move,
.ttm_cache_flush = i915_flush_ttm,
};
#endif

2
shared-core/i915_drv.h
View file

@ -310,7 +310,7 @@ extern int i915_init_mem_type(struct drm_device *dev, uint32_t type,
extern uint32_t i915_evict_mask(struct drm_buffer_object *bo);
extern int i915_move(struct drm_buffer_object *bo, int evict,
int no_wait, struct drm_bo_mem_reg *new_mem);
void i915_flush_ttm(struct drm_ttm *ttm);
#endif
#define I915_READ(reg) DRM_READ32(dev_priv->mmio_map, (reg))