diff options
| author | Jesse Barnes <jbarnes@virtuousgeek.org> | 2009-03-31 18:22:31 -0700 |
|---|---|---|
| committer | Eric Anholt <eric@anholt.net> | 2009-04-02 14:28:32 -0700 |
| commit | 1055f9ddad093f54dfd708a0f976582034d4ce1a (patch) | |
| tree | 0e13654a1cc5cbd204b7b2cbaebd48b11821d507 /drivers/gpu/drm | |
| parent | 5e118f4139feafe97e913df67b1f7c1e5083e535 (diff) | |
drm: Use pgprot_writecombine in GEM GTT mapping to get the right bits for !PAT.
Otherwise, the PAGE_CACHE_WC would end up getting us a UC-only mapping, and
the write performance of GTT maps dropped 10x.
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
[anholt: cleaned up unused var]
Signed-off-by: Eric Anholt <eric@anholt.net>
Diffstat (limited to 'drivers/gpu/drm')
| -rw-r--r-- | drivers/gpu/drm/drm_gem.c | 7 |
1 files changed, 1 insertions, 6 deletions
diff --git a/drivers/gpu/drm/drm_gem.c b/drivers/gpu/drm/drm_gem.c index c1173d8c4588..4984aa89cf3d 100644 --- a/drivers/gpu/drm/drm_gem.c +++ b/drivers/gpu/drm/drm_gem.c @@ -505,7 +505,6 @@ int drm_gem_mmap(struct file *filp, struct vm_area_struct *vma) struct drm_local_map *map = NULL; struct drm_gem_object *obj; struct drm_hash_item *hash; - unsigned long prot; int ret = 0; mutex_lock(&dev->struct_mutex); @@ -538,11 +537,7 @@ int drm_gem_mmap(struct file *filp, struct vm_area_struct *vma) vma->vm_ops = obj->dev->driver->gem_vm_ops; vma->vm_private_data = map->handle; /* FIXME: use pgprot_writecombine when available */ - prot = pgprot_val(vma->vm_page_prot); -#ifdef CONFIG_X86 - prot |= _PAGE_CACHE_WC; -#endif - vma->vm_page_prot = __pgprot(prot); + vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot); /* Take a ref for this mapping of the object, so that the fault * handler can dereference the mmap offset's pointer to the object. |