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SubjectRe: [virtio-dev] [PATCH 2/2] drm/virtio: add iommu support.
For the series,

Reviewed-by: Dave Airlie <airlied@redhat.com>
On Wed, 29 Aug 2018 at 22:20, Gerd Hoffmann <kraxel@redhat.com> wrote:
>
> Use the dma mapping api and properly add iommu mappings for
> objects, unless virtio is in iommu quirk mode.
>
> Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
> ---
> drivers/gpu/drm/virtio/virtgpu_drv.h | 1 +
> drivers/gpu/drm/virtio/virtgpu_vq.c | 46 +++++++++++++++++++++++++++++-------
> 2 files changed, 38 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/gpu/drm/virtio/virtgpu_drv.h b/drivers/gpu/drm/virtio/virtgpu_drv.h
> index cbbff01077..ec9a38f995 100644
> --- a/drivers/gpu/drm/virtio/virtgpu_drv.h
> +++ b/drivers/gpu/drm/virtio/virtgpu_drv.h
> @@ -57,6 +57,7 @@ struct virtio_gpu_object {
> uint32_t hw_res_handle;
>
> struct sg_table *pages;
> + uint32_t mapped;
> void *vmap;
> bool dumb;
> struct ttm_place placement_code;
> diff --git a/drivers/gpu/drm/virtio/virtgpu_vq.c b/drivers/gpu/drm/virtio/virtgpu_vq.c
> index af24e91267..bf631d32d4 100644
> --- a/drivers/gpu/drm/virtio/virtgpu_vq.c
> +++ b/drivers/gpu/drm/virtio/virtgpu_vq.c
> @@ -424,7 +424,8 @@ void virtio_gpu_cmd_unref_resource(struct virtio_gpu_device *vgdev,
> }
>
> static void virtio_gpu_cmd_resource_inval_backing(struct virtio_gpu_device *vgdev,
> - uint32_t resource_id)
> + uint32_t resource_id,
> + struct virtio_gpu_fence **fence)
> {
> struct virtio_gpu_resource_detach_backing *cmd_p;
> struct virtio_gpu_vbuffer *vbuf;
> @@ -435,7 +436,7 @@ static void virtio_gpu_cmd_resource_inval_backing(struct virtio_gpu_device *vgde
> cmd_p->hdr.type = cpu_to_le32(VIRTIO_GPU_CMD_RESOURCE_DETACH_BACKING);
> cmd_p->resource_id = cpu_to_le32(resource_id);
>
> - virtio_gpu_queue_ctrl_buffer(vgdev, vbuf);
> + virtio_gpu_queue_fenced_ctrl_buffer(vgdev, vbuf, &cmd_p->hdr, fence);
> }
>
> void virtio_gpu_cmd_set_scanout(struct virtio_gpu_device *vgdev,
> @@ -848,9 +849,10 @@ int virtio_gpu_object_attach(struct virtio_gpu_device *vgdev,
> uint32_t resource_id,
> struct virtio_gpu_fence **fence)
> {
> + bool use_dma_api = !virtio_has_iommu_quirk(vgdev->vdev);
> struct virtio_gpu_mem_entry *ents;
> struct scatterlist *sg;
> - int si;
> + int si, nents;
>
> if (!obj->pages) {
> int ret;
> @@ -860,23 +862,33 @@ int virtio_gpu_object_attach(struct virtio_gpu_device *vgdev,
> return ret;
> }
>
> + if (use_dma_api) {
> + obj->mapped = dma_map_sg(vgdev->vdev->dev.parent,
> + obj->pages->sgl, obj->pages->nents,
> + DMA_TO_DEVICE);
> + nents = obj->mapped;
> + } else {
> + nents = obj->pages->nents;
> + }
> +
> /* gets freed when the ring has consumed it */
> - ents = kmalloc_array(obj->pages->nents,
> - sizeof(struct virtio_gpu_mem_entry),
> + ents = kmalloc_array(nents, sizeof(struct virtio_gpu_mem_entry),
> GFP_KERNEL);
> if (!ents) {
> DRM_ERROR("failed to allocate ent list\n");
> return -ENOMEM;
> }
>
> - for_each_sg(obj->pages->sgl, sg, obj->pages->nents, si) {
> - ents[si].addr = cpu_to_le64(sg_phys(sg));
> + for_each_sg(obj->pages->sgl, sg, nents, si) {
> + ents[si].addr = cpu_to_le64(use_dma_api
> + ? sg_dma_address(sg)
> + : sg_phys(sg));
> ents[si].length = cpu_to_le32(sg->length);
> ents[si].padding = 0;
> }
>
> virtio_gpu_cmd_resource_attach_backing(vgdev, resource_id,
> - ents, obj->pages->nents,
> + ents, nents,
> fence);
> obj->hw_res_handle = resource_id;
> return 0;
> @@ -885,7 +897,23 @@ int virtio_gpu_object_attach(struct virtio_gpu_device *vgdev,
> void virtio_gpu_object_detach(struct virtio_gpu_device *vgdev,
> struct virtio_gpu_object *obj)
> {
> - virtio_gpu_cmd_resource_inval_backing(vgdev, obj->hw_res_handle);
> + bool use_dma_api = !virtio_has_iommu_quirk(vgdev->vdev);
> + struct virtio_gpu_fence *fence;
> +
> + if (use_dma_api && obj->mapped) {
> + /* detach backing and wait for the host process it ... */
> + virtio_gpu_cmd_resource_inval_backing(vgdev, obj->hw_res_handle, &fence);
> + dma_fence_wait(&fence->f, true);
> + dma_fence_put(&fence->f);
> +
> + /* ... then tear down iommu mappings */
> + dma_unmap_sg(vgdev->vdev->dev.parent,
> + obj->pages->sgl, obj->mapped,
> + DMA_TO_DEVICE);
> + obj->mapped = 0;
> + } else {
> + virtio_gpu_cmd_resource_inval_backing(vgdev, obj->hw_res_handle, NULL);
> + }
> }
>
> void virtio_gpu_cursor_ping(struct virtio_gpu_device *vgdev,
> --
> 2.9.3
>
>
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