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authorGrigori Goronzy <greg@chown.ath.cx>2015-07-03 01:54:10 +0200
committerAlex Deucher <alexander.deucher@amd.com>2015-07-08 12:41:39 -0400
commit828202a382a06eda74202d4888d01a1078c68922 (patch)
tree29a3600659a96e04617b1da6dd94238bdd3b263d /drivers/gpu/drm/radeon/radeon_gem.c
parentbd833144a23dead304744dc748f5d72d7e92d315 (diff)
drm/radeon: use RCU query for GEM_BUSY syscall
We don't need to call the (expensive) radeon_bo_wait, checking the fences via RCU is much faster. The reservation done by radeon_bo_wait does not save us from any race conditions. Reviewed-by: Christian König <christian.koenig@amd.com> Signed-off-by: Grigori Goronzy <greg@chown.ath.cx> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'drivers/gpu/drm/radeon/radeon_gem.c')
-rw-r--r--drivers/gpu/drm/radeon/radeon_gem.c11
1 files changed, 8 insertions, 3 deletions
diff --git a/drivers/gpu/drm/radeon/radeon_gem.c b/drivers/gpu/drm/radeon/radeon_gem.c
index ac3c1310b953..7199e19eb8ba 100644
--- a/drivers/gpu/drm/radeon/radeon_gem.c
+++ b/drivers/gpu/drm/radeon/radeon_gem.c
@@ -428,7 +428,6 @@ int radeon_gem_mmap_ioctl(struct drm_device *dev, void *data,
int radeon_gem_busy_ioctl(struct drm_device *dev, void *data,
struct drm_file *filp)
{
- struct radeon_device *rdev = dev->dev_private;
struct drm_radeon_gem_busy *args = data;
struct drm_gem_object *gobj;
struct radeon_bo *robj;
@@ -440,10 +439,16 @@ int radeon_gem_busy_ioctl(struct drm_device *dev, void *data,
return -ENOENT;
}
robj = gem_to_radeon_bo(gobj);
- r = radeon_bo_wait(robj, &cur_placement, true);
+
+ r = reservation_object_test_signaled_rcu(robj->tbo.resv, true);
+ if (r == 0)
+ r = -EBUSY;
+ else
+ r = 0;
+
+ cur_placement = ACCESS_ONCE(robj->tbo.mem.mem_type);
args->domain = radeon_mem_type_to_domain(cur_placement);
drm_gem_object_unreference_unlocked(gobj);
- r = radeon_gem_handle_lockup(rdev, r);
return r;
}