drm/radeon/kms: implement bo busy check + current domain

This implements the busy ioctl along with a current domain check.
returns 0 or -EBUSY
puts the current domain no matter what the answer.

Signed-off-by: Dave Airlie <airlied@redhat.com>

3 files changed, 41 insertions, 1 deletions

diff --git a/drivers/gpu/drm/radeon/radeon.h b/drivers/gpu/drm/radeon/radeon.h
index 87170a56e37b..79ad98264e33 100644
--- a/drivers/gpu/drm/radeon/radeon.h
+++ b/drivers/gpu/drm/radeon/radeon.h
@@ -242,6 +242,7 @@ int radeon_object_pin(struct radeon_object *robj, uint32_t domain,
                       uint64_t *gpu_addr);
 void radeon_object_unpin(struct radeon_object *robj);
 int radeon_object_wait(struct radeon_object *robj);
+int radeon_object_busy_domain(struct radeon_object *robj, uint32_t *cur_placement);
 int radeon_object_evict_vram(struct radeon_device *rdev);
 int radeon_object_mmap(struct radeon_object *robj, uint64_t *offset);
 void radeon_object_force_delete(struct radeon_device *rdev);
diff --git a/drivers/gpu/drm/radeon/radeon_gem.c b/drivers/gpu/drm/radeon/radeon_gem.c
index cded5180c752..d4ceff13bbb1 100644
--- a/drivers/gpu/drm/radeon/radeon_gem.c
+++ b/drivers/gpu/drm/radeon/radeon_gem.c
@@ -262,7 +262,27 @@ 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)
 {
-        /* FIXME: implement */
+        struct drm_radeon_gem_busy *args = data;
+        struct drm_gem_object *gobj;
+        struct radeon_object *robj;
+        int r;
+        uint32_t cur_placement;
+
+        gobj = drm_gem_object_lookup(dev, filp, args->handle);
+        if (gobj == NULL) {
+                return -EINVAL;
+        }
+        robj = gobj->driver_private;
+        r = radeon_object_busy_domain(robj, &cur_placement);
+        if (cur_placement == TTM_PL_VRAM)
+                args->domain = RADEON_GEM_DOMAIN_VRAM;
+        if (cur_placement == TTM_PL_FLAG_TT)
+                args->domain = RADEON_GEM_DOMAIN_GTT;
+        if (cur_placement == TTM_PL_FLAG_SYSTEM)
+                args->domain = RADEON_GEM_DOMAIN_CPU;
+        mutex_lock(&dev->struct_mutex);
+        drm_gem_object_unreference(gobj);
+        mutex_unlock(&dev->struct_mutex);
         return 0;
 }
 
diff --git a/drivers/gpu/drm/radeon/radeon_object.c b/drivers/gpu/drm/radeon/radeon_object.c
index e98cae3bf4a6..b85fb83d7ae8 100644
--- a/drivers/gpu/drm/radeon/radeon_object.c
+++ b/drivers/gpu/drm/radeon/radeon_object.c
@@ -316,6 +316,25 @@ int radeon_object_wait(struct radeon_object *robj)
         return r;
 }
 
+int radeon_object_busy_domain(struct radeon_object *robj, uint32_t *cur_placement)
+{
+        int r = 0;
+
+        r = radeon_object_reserve(robj, true);
+        if (unlikely(r != 0)) {
+                DRM_ERROR("radeon: failed to reserve object for waiting.\n");
+                return r;
+        }
+        spin_lock(&robj->tobj.lock);
+        *cur_placement = robj->tobj.mem.mem_type;
+        if (robj->tobj.sync_obj) {
+                r = ttm_bo_wait(&robj->tobj, true, true, true);
+        }
+        spin_unlock(&robj->tobj.lock);
+        radeon_object_unreserve(robj);
+        return r;
+}
+
 int radeon_object_evict_vram(struct radeon_device *rdev)
 {
         if (rdev->flags & RADEON_IS_IGP) {