Re: [PATCH] drm/radeon: preallocate mem for UVD create/destroy msg

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On Fri, Aug 22, 2014 at 8:30 AM, Christian König
<deathsimple@xxxxxxxxxxx> wrote:
> From: Christian König <christian.koenig@xxxxxxx>
>
> 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@xxxxxxx>

Added to my 3.18 queue.

Thanks,

Alex


> ---
>  drivers/gpu/drm/radeon/radeon_uvd.c | 101 ++++++++++--------------------------
>  1 file changed, 26 insertions(+), 75 deletions(-)
>
> diff --git a/drivers/gpu/drm/radeon/radeon_uvd.c b/drivers/gpu/drm/radeon/radeon_uvd.c
> index d33dacc..1c1e569 100644
> --- a/drivers/gpu/drm/radeon/radeon_uvd.c
> +++ b/drivers/gpu/drm/radeon/radeon_uvd.c
> @@ -115,7 +115,8 @@ 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) {
> @@ -624,38 +625,16 @@ 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);
> @@ -667,19 +646,11 @@ static int radeon_uvd_send_msg(struct radeon_device *rdev,
>         ib.length_dw = 16;
>
>         r = radeon_ib_schedule(rdev, &ib, NULL);
> -       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;
>  }
>
> @@ -689,27 +660,18 @@ 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);
> @@ -726,36 +688,26 @@ 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);
> @@ -765,10 +717,9 @@ 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;
>  }
>
>  /**
> --
> 1.9.1
>
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