Gurchetan Singh
2020-Mar-02 17:19 UTC
[virtio-dev] [PATCH v2 4/4] drm/virtio: Support virtgpu exported resources
On Mon, Mar 2, 2020 at 4:15 AM David Stevens <stevensd at chromium.org> wrote:> > Add support for UUID-based resource sharing mechanism to virtgpu. This > implements the new virtgpu commands and hooks them up to dma-buf's > get_uuid callback. > > Signed-off-by: David Stevens <stevensd at chromium.org> > --- > drivers/gpu/drm/virtio/virtgpu_drv.c | 3 ++ > drivers/gpu/drm/virtio/virtgpu_drv.h | 19 ++++++++ > drivers/gpu/drm/virtio/virtgpu_kms.c | 4 ++ > drivers/gpu/drm/virtio/virtgpu_prime.c | 48 ++++++++++++++++++-- > drivers/gpu/drm/virtio/virtgpu_vq.c | 62 ++++++++++++++++++++++++++ > 5 files changed, 133 insertions(+), 3 deletions(-) > > diff --git a/drivers/gpu/drm/virtio/virtgpu_drv.c b/drivers/gpu/drm/virtio/virtgpu_drv.c > index ab4bed78e656..776e6667042e 100644 > --- a/drivers/gpu/drm/virtio/virtgpu_drv.c > +++ b/drivers/gpu/drm/virtio/virtgpu_drv.c > @@ -165,6 +165,7 @@ static unsigned int features[] = { > VIRTIO_GPU_F_VIRGL, > #endif > VIRTIO_GPU_F_EDID, > + VIRTIO_GPU_F_RESOURCE_UUID, > }; > static struct virtio_driver virtio_gpu_driver = { > .feature_table = features, > @@ -202,7 +203,9 @@ static struct drm_driver driver = { > .prime_handle_to_fd = drm_gem_prime_handle_to_fd, > .prime_fd_to_handle = drm_gem_prime_fd_to_handle, > .gem_prime_mmap = drm_gem_prime_mmap, > + .gem_prime_export = virtgpu_gem_prime_export, > .gem_prime_import_sg_table = virtgpu_gem_prime_import_sg_table, > + .gem_prime_get_uuid = virtgpu_gem_prime_get_uuid, > > .gem_create_object = virtio_gpu_create_object, > .fops = &virtio_gpu_driver_fops, > diff --git a/drivers/gpu/drm/virtio/virtgpu_drv.h b/drivers/gpu/drm/virtio/virtgpu_drv.h > index af9403e1cf78..4be84de73d86 100644 > --- a/drivers/gpu/drm/virtio/virtgpu_drv.h > +++ b/drivers/gpu/drm/virtio/virtgpu_drv.h > @@ -49,6 +49,11 @@ > #define DRIVER_MINOR 1 > #define DRIVER_PATCHLEVEL 0 > > +#define UUID_NOT_INITIALIZED 0 > +#define UUID_INITIALIZING 1 > +#define UUID_INITIALIZED 2 > +#define UUID_INITIALIZATION_FAILED 3 > + > struct virtio_gpu_object_params { > uint32_t format; > uint32_t width; > @@ -75,6 +80,9 @@ struct virtio_gpu_object { > > bool dumb; > bool created; > + > + int uuid_state; > + uuid_t uuid; > }; > #define gem_to_virtio_gpu_obj(gobj) \ > container_of((gobj), struct virtio_gpu_object, base.base) > @@ -196,6 +204,7 @@ struct virtio_gpu_device { > bool has_virgl_3d; > bool has_edid; > bool has_indirect; > + bool has_resource_assign_uuid; > > struct work_struct config_changed_work; > > @@ -206,6 +215,8 @@ struct virtio_gpu_device { > struct virtio_gpu_drv_capset *capsets; > uint32_t num_capsets; > struct list_head cap_cache; > + > + spinlock_t resource_export_lock; > }; > > struct virtio_gpu_fpriv { > @@ -338,6 +349,10 @@ void virtio_gpu_dequeue_fence_func(struct work_struct *work); > void virtio_gpu_disable_notify(struct virtio_gpu_device *vgdev); > void virtio_gpu_enable_notify(struct virtio_gpu_device *vgdev); > > +int > +virtio_gpu_cmd_resource_assign_uuid(struct virtio_gpu_device *vgdev, > + struct virtio_gpu_object *bo); > + > /* virtio_gpu_display.c */ > void virtio_gpu_modeset_init(struct virtio_gpu_device *vgdev); > void virtio_gpu_modeset_fini(struct virtio_gpu_device *vgdev); > @@ -366,6 +381,10 @@ int virtio_gpu_object_create(struct virtio_gpu_device *vgdev, > struct virtio_gpu_object **bo_ptr, > struct virtio_gpu_fence *fence); > /* virtgpu_prime.c */ > +struct dma_buf *virtgpu_gem_prime_export(struct drm_gem_object *obj, > + int flags); > +int virtgpu_gem_prime_get_uuid(struct drm_gem_object *obj, > + uuid_t *uuid); > struct drm_gem_object *virtgpu_gem_prime_import_sg_table( > struct drm_device *dev, struct dma_buf_attachment *attach, > struct sg_table *sgt); > diff --git a/drivers/gpu/drm/virtio/virtgpu_kms.c b/drivers/gpu/drm/virtio/virtgpu_kms.c > index 4009c2f97d08..5a2aeb6d2f35 100644 > --- a/drivers/gpu/drm/virtio/virtgpu_kms.c > +++ b/drivers/gpu/drm/virtio/virtgpu_kms.c > @@ -134,6 +134,7 @@ int virtio_gpu_init(struct drm_device *dev) > vgdev->dev = dev->dev; > > spin_lock_init(&vgdev->display_info_lock); > + spin_lock_init(&vgdev->resource_export_lock); > ida_init(&vgdev->ctx_id_ida); > ida_init(&vgdev->resource_ida); > init_waitqueue_head(&vgdev->resp_wq); > @@ -162,6 +163,9 @@ int virtio_gpu_init(struct drm_device *dev) > if (virtio_has_feature(vgdev->vdev, VIRTIO_RING_F_INDIRECT_DESC)) { > vgdev->has_indirect = true; > } > + if (virtio_has_feature(vgdev->vdev, VIRTIO_GPU_F_RESOURCE_UUID)) { > + vgdev->has_resource_assign_uuid = true; > + } > > DRM_INFO("features: %cvirgl %cedid\n", > vgdev->has_virgl_3d ? '+' : '-', > diff --git a/drivers/gpu/drm/virtio/virtgpu_prime.c b/drivers/gpu/drm/virtio/virtgpu_prime.c > index 050d24c39a8f..12ceda34b4f9 100644 > --- a/drivers/gpu/drm/virtio/virtgpu_prime.c > +++ b/drivers/gpu/drm/virtio/virtgpu_prime.c > @@ -26,9 +26,51 @@ > > #include "virtgpu_drv.h" > > -/* Empty Implementations as there should not be any other driver for a virtual > - * device that might share buffers with virtgpu > - */ > +int virtgpu_gem_prime_get_uuid(struct drm_gem_object *obj, > + uuid_t *uuid) > +{ > + struct virtio_gpu_object *bo = gem_to_virtio_gpu_obj(obj); > + struct virtio_gpu_device *vgdev = obj->dev->dev_private; > + > + // The state should have changed when the buffer was exported. > + WARN_ON(bo->uuid_state == UUID_NOT_INITIALIZED); > + > + wait_event(vgdev->resp_wq, bo->uuid_state != UUID_INITIALIZING); > + if (bo->uuid_state != UUID_INITIALIZED) > + return -ENODEV; > + > + uuid_copy(uuid, &bo->uuid); > + > + return 0; > +} > + > +struct dma_buf *virtgpu_gem_prime_export(struct drm_gem_object *obj, > + int flags) > +{ > + struct virtio_gpu_object *bo = gem_to_virtio_gpu_obj(obj); > + struct virtio_gpu_device *vgdev = obj->dev->dev_private; > + bool needs_init = false; > + int ret = 0; > + > + if (vgdev->has_resource_assign_uuid) { > + spin_lock(&vgdev->resource_export_lock); > + if (bo->uuid_state == UUID_NOT_INITIALIZED) { > + bo->uuid_state = UUID_INITIALIZING; > + needs_init = true; > + } > + spin_unlock(&vgdev->resource_export_lock); > + > + if (needs_init) { > + ret = virtio_gpu_cmd_resource_assign_uuid(vgdev, bo); > + if (ret) > + return ERR_PTR(ret); > + } > + } else { > + bo->uuid_state = UUID_INITIALIZATION_FAILED; > + } > + > + return drm_gem_prime_export(obj, flags); > +} > > struct drm_gem_object *virtgpu_gem_prime_import_sg_table( > struct drm_device *dev, struct dma_buf_attachment *attach, > diff --git a/drivers/gpu/drm/virtio/virtgpu_vq.c b/drivers/gpu/drm/virtio/virtgpu_vq.c > index cfe9c54f87a3..e692098fc573 100644 > --- a/drivers/gpu/drm/virtio/virtgpu_vq.c > +++ b/drivers/gpu/drm/virtio/virtgpu_vq.c > @@ -1111,3 +1111,65 @@ void virtio_gpu_cursor_ping(struct virtio_gpu_device *vgdev, > memcpy(cur_p, &output->cursor, sizeof(output->cursor)); > virtio_gpu_queue_cursor(vgdev, vbuf); > } > + > +static void virtio_gpu_cmd_resource_uuid_cb(struct virtio_gpu_device *vgdev, > + struct virtio_gpu_vbuffer *vbuf) > +{ > + struct virtio_gpu_resp_resource_uuid *resp > + (struct virtio_gpu_resp_resource_uuid *)vbuf->resp_buf; > + struct virtio_gpu_object *obj > + (struct virtio_gpu_object *)vbuf->data_buf; > + uint32_t resp_type = le32_to_cpu(resp->hdr.type); > + > + /* > + * Keeps the data_buf, which points to this virtio_gpu_object, from > + * getting kfree'd after this cb returns. > + */ > + vbuf->data_buf = NULL; > + > + spin_lock(&vgdev->resource_export_lock); > + WARN_ON(obj->uuid_state != UUID_INITIALIZING); > + > + if (resp_type == VIRTIO_GPU_RESP_OK_RESOURCE_UUID && > + obj->uuid_state == UUID_INITIALIZING) { > + memcpy(&obj->uuid.b, resp->uuid, sizeof(obj->uuid.b)); > + obj->uuid_state = UUID_INITIALIZED; > + } else { > + obj->uuid_state = UUID_INITIALIZATION_FAILED; > + } > + spin_unlock(&vgdev->resource_export_lock); > + > + drm_gem_object_put_unlocked(&obj->base.base); > + wake_up_all(&vgdev->resp_wq); > +} > + > +int > +virtio_gpu_cmd_resource_assign_uuid(struct virtio_gpu_device *vgdev, > + struct virtio_gpu_object *bo) > +{ > + struct virtio_gpu_resource_assign_uuid *cmd_p; > + struct virtio_gpu_vbuffer *vbuf; > + struct virtio_gpu_resp_resource_uuid *resp_buf; > + > + resp_buf = kzalloc(sizeof(*resp_buf), GFP_KERNEL); > + if (!resp_buf) { > + spin_lock(&vgdev->resource_export_lock); > + bo->uuid_state = UUID_INITIALIZATION_FAILED; > + spin_unlock(&vgdev->resource_export_lock); > + return -ENOMEM; > + } > + > + cmd_p = virtio_gpu_alloc_cmd_resp(vgdev, > + virtio_gpu_cmd_resource_uuid_cb, &vbuf, sizeof(*cmd_p), > + sizeof(struct virtio_gpu_resp_resource_uuid), resp_buf); > + memset(cmd_p, 0, sizeof(*cmd_p)); > + > + cmd_p->hdr.type = cpu_to_le32(VIRTIO_GPU_CMD_RESOURCE_ASSIGN_UUID);cmd_p->hdr.ctx_id Before this completion of this hypercall, this resource can be considered context local, while afterward it can be considered "exported".> + cmd_p->resource_id = cpu_to_le32(bo->hw_res_handle); > + > + /* Reuse the data_buf pointer for the object pointer. */ > + vbuf->data_buf = bo; > + drm_gem_object_get(&bo->base.base);vbuf->objs?> + virtio_gpu_queue_ctrl_buffer(vgdev, vbuf); > + return 0;> +} > -- > 2.25.0.265.gbab2e86ba0-goog > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: virtio-dev-unsubscribe at lists.oasis-open.org > For additional commands, e-mail: virtio-dev-help at lists.oasis-open.org >
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