drm/radeon: preallocate mem for UVD create/destroy msg

llocating memory for UVD create and destroy messages can fail, which is
rather annoying when this happens in the middle of a GPU reset. Try to
avoid this condition by preallocating a page for those dummy messages.

Signed-off-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

1 files changed, 26 insertions, 75 deletions

diff --git a/drivers/gpu/drm/radeon/radeon_uvd.c b/drivers/gpu/drm/radeon/radeon_uvd.c
index 1dedadd8f5df..5729e9bebd9d 100644
--- a/drivers/gpu/drm/radeon/radeon_uvd.c
+++ b/drivers/gpu/drm/radeon/radeon_uvd.c
@@ -138,7 +138,8 @@ int radeon_uvd_init(struct radeon_device *rdev)
         }
 
         bo_size = RADEON_GPU_PAGE_ALIGN(rdev->uvd_fw->size + 8) +
-                  RADEON_UVD_STACK_SIZE + RADEON_UVD_HEAP_SIZE;
+                  RADEON_UVD_STACK_SIZE + RADEON_UVD_HEAP_SIZE +
+                  RADEON_GPU_PAGE_SIZE;
         r = radeon_bo_create(rdev, bo_size, PAGE_SIZE, true,
                              RADEON_GEM_DOMAIN_VRAM, 0, NULL, &rdev->uvd.vcpu_bo);
         if (r) {
@@ -647,38 +648,16 @@ int radeon_uvd_cs_parse(struct radeon_cs_parser *p)
 }
 
 static int radeon_uvd_send_msg(struct radeon_device *rdev,
-                               int ring, struct radeon_bo *bo,
+                               int ring, uint64_t addr,
                                struct radeon_fence **fence)
 {
-        struct ttm_validate_buffer tv;
-        struct ww_acquire_ctx ticket;
-        struct list_head head;
         struct radeon_ib ib;
-        uint64_t addr;
         int i, r;
 
-        memset(&tv, 0, sizeof(tv));
-        tv.bo = &bo->tbo;
-
-        INIT_LIST_HEAD(&head);
-        list_add(&tv.head, &head);
-
-        r = ttm_eu_reserve_buffers(&ticket, &head);
-        if (r)
-                return r;
-
-        radeon_ttm_placement_from_domain(bo, RADEON_GEM_DOMAIN_VRAM);
-        radeon_uvd_force_into_uvd_segment(bo, RADEON_GEM_DOMAIN_VRAM);
-
-        r = ttm_bo_validate(&bo->tbo, &bo->placement, true, false);
-        if (r) 
-                goto err;
-
         r = radeon_ib_get(rdev, ring, &ib, NULL, 64);
         if (r)
-                goto err;
+                return r;
 
-        addr = radeon_bo_gpu_offset(bo);
         ib.ptr[0] = PACKET0(UVD_GPCOM_VCPU_DATA0, 0);
         ib.ptr[1] = addr;
         ib.ptr[2] = PACKET0(UVD_GPCOM_VCPU_DATA1, 0);
@@ -690,19 +669,11 @@ static int radeon_uvd_send_msg(struct radeon_device *rdev,
         ib.length_dw = 16;
 
         r = radeon_ib_schedule(rdev, &ib, NULL, false);
-        if (r)
-                goto err;
-        ttm_eu_fence_buffer_objects(&ticket, &head, ib.fence);
 
         if (fence)
                 *fence = radeon_fence_ref(ib.fence);
 
         radeon_ib_free(rdev, &ib);
-        radeon_bo_unref(&bo);
-        return 0;
-
-err:
-        ttm_eu_backoff_reservation(&ticket, &head);
         return r;
 }
 
@@ -712,27 +683,18 @@ err:
 int radeon_uvd_get_create_msg(struct radeon_device *rdev, int ring,
                               uint32_t handle, struct radeon_fence **fence)
 {
-        struct radeon_bo *bo;
-        uint32_t *msg;
-        int r, i;
+        /* we use the last page of the vcpu bo for the UVD message */
+        uint64_t offs = radeon_bo_size(rdev->uvd.vcpu_bo) -
+                RADEON_GPU_PAGE_SIZE;
 
-        r = radeon_bo_create(rdev, 1024, PAGE_SIZE, true,
-                             RADEON_GEM_DOMAIN_VRAM, 0, NULL, &bo);
-        if (r)
-                return r;
+        uint32_t *msg = rdev->uvd.cpu_addr + offs;
+        uint64_t addr = rdev->uvd.gpu_addr + offs;
 
-        r = radeon_bo_reserve(bo, false);
-        if (r) {
-                radeon_bo_unref(&bo);
-                return r;
-        }
+        int r, i;
 
-        r = radeon_bo_kmap(bo, (void **)&msg);
-        if (r) {
-                radeon_bo_unreserve(bo);
-                radeon_bo_unref(&bo);
+        r = radeon_bo_reserve(rdev->uvd.vcpu_bo, true);
+        if (r)
                 return r;
-        }
 
         /* stitch together an UVD create msg */
         msg[0] = cpu_to_le32(0x00000de4);
@@ -749,36 +711,26 @@ int radeon_uvd_get_create_msg(struct radeon_device *rdev, int ring,
         for (i = 11; i < 1024; ++i)
                 msg[i] = cpu_to_le32(0x0);
 
-        radeon_bo_kunmap(bo);
-        radeon_bo_unreserve(bo);
-
-        return radeon_uvd_send_msg(rdev, ring, bo, fence);
+        r = radeon_uvd_send_msg(rdev, ring, addr, fence);
+        radeon_bo_unreserve(rdev->uvd.vcpu_bo);
+        return r;
 }
 
 int radeon_uvd_get_destroy_msg(struct radeon_device *rdev, int ring,
                                uint32_t handle, struct radeon_fence **fence)
 {
-        struct radeon_bo *bo;
-        uint32_t *msg;
-        int r, i;
+        /* we use the last page of the vcpu bo for the UVD message */
+        uint64_t offs = radeon_bo_size(rdev->uvd.vcpu_bo) -
+                RADEON_GPU_PAGE_SIZE;
 
-        r = radeon_bo_create(rdev, 1024, PAGE_SIZE, true,
-                             RADEON_GEM_DOMAIN_VRAM, 0, NULL, &bo);
-        if (r)
-                return r;
+        uint32_t *msg = rdev->uvd.cpu_addr + offs;
+        uint64_t addr = rdev->uvd.gpu_addr + offs;
 
-        r = radeon_bo_reserve(bo, false);
-        if (r) {
-                radeon_bo_unref(&bo);
-                return r;
-        }
+        int r, i;
 
-        r = radeon_bo_kmap(bo, (void **)&msg);
-        if (r) {
-                radeon_bo_unreserve(bo);
-                radeon_bo_unref(&bo);
+        r = radeon_bo_reserve(rdev->uvd.vcpu_bo, true);
+        if (r)
                 return r;
-        }
 
         /* stitch together an UVD destroy msg */
         msg[0] = cpu_to_le32(0x00000de4);
@@ -788,10 +740,9 @@ int radeon_uvd_get_destroy_msg(struct radeon_device *rdev, int ring,
         for (i = 4; i < 1024; ++i)
                 msg[i] = cpu_to_le32(0x0);
 
-        radeon_bo_kunmap(bo);
-        radeon_bo_unreserve(bo);
-
-        return radeon_uvd_send_msg(rdev, ring, bo, fence);
+        r = radeon_uvd_send_msg(rdev, ring, addr, fence);
+        radeon_bo_unreserve(rdev->uvd.vcpu_bo);
+        return r;
 }
 
 /**