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Message-ID: <CAPaKu7T0fv08oVbyYLcpaHomB0w-ZbF4mKGsgt7ObziQxk3YNQ@mail.gmail.com>
Date: Sun, 30 Jun 2019 11:22:50 -0700
From: Chia-I Wu <olvaffe@...il.com>
To: Gerd Hoffmann <kraxel@...hat.com>
Cc: ML dri-devel <dri-devel@...ts.freedesktop.org>,
David Airlie <airlied@...ux.ie>,
Daniel Vetter <daniel@...ll.ch>,
"open list:VIRTIO GPU DRIVER"
<virtualization@...ts.linux-foundation.org>,
open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v5 09/12] drm/virtio: rework virtio_gpu_object_create fencing
On Fri, Jun 28, 2019 at 5:13 AM Gerd Hoffmann <kraxel@...hat.com> wrote:
>
> Use gem reservation helpers and direct reservation_object_* calls
> instead of ttm.
>
> v5: fix fencing (Chia-I Wu).
> v3: Due to using the gem reservation object it is initialized and ready
> for use before calling ttm_bo_init, so we can also drop the tricky fence
> logic which checks whenever the command is in flight still. We can
> simply fence our object before submitting the virtio command and be done
> with it.
>
> Signed-off-by: Gerd Hoffmann <kraxel@...hat.com>
> Acked-by: Daniel Vetter <daniel.vetter@...ll.ch>
> ---
> drivers/gpu/drm/virtio/virtgpu_drv.h | 2 +
> drivers/gpu/drm/virtio/virtgpu_object.c | 55 ++++++++++---------------
> drivers/gpu/drm/virtio/virtgpu_vq.c | 4 ++
> 3 files changed, 27 insertions(+), 34 deletions(-)
>
> diff --git a/drivers/gpu/drm/virtio/virtgpu_drv.h b/drivers/gpu/drm/virtio/virtgpu_drv.h
> index 356d27132388..c4b266b6f731 100644
> --- a/drivers/gpu/drm/virtio/virtgpu_drv.h
> +++ b/drivers/gpu/drm/virtio/virtgpu_drv.h
> @@ -267,6 +267,7 @@ void virtio_gpu_free_vbufs(struct virtio_gpu_device *vgdev);
> void virtio_gpu_cmd_create_resource(struct virtio_gpu_device *vgdev,
> struct virtio_gpu_object *bo,
> struct virtio_gpu_object_params *params,
> + struct virtio_gpu_object_array *objs,
> struct virtio_gpu_fence *fence);
> void virtio_gpu_cmd_unref_resource(struct virtio_gpu_device *vgdev,
> uint32_t resource_id);
> @@ -329,6 +330,7 @@ void
> virtio_gpu_cmd_resource_create_3d(struct virtio_gpu_device *vgdev,
> struct virtio_gpu_object *bo,
> struct virtio_gpu_object_params *params,
> + struct virtio_gpu_object_array *objs,
> struct virtio_gpu_fence *fence);
> void virtio_gpu_ctrl_ack(struct virtqueue *vq);
> void virtio_gpu_cursor_ack(struct virtqueue *vq);
> diff --git a/drivers/gpu/drm/virtio/virtgpu_object.c b/drivers/gpu/drm/virtio/virtgpu_object.c
> index 82bfbf983fd2..fa0ea22c68b0 100644
> --- a/drivers/gpu/drm/virtio/virtgpu_object.c
> +++ b/drivers/gpu/drm/virtio/virtgpu_object.c
> @@ -97,7 +97,9 @@ int virtio_gpu_object_create(struct virtio_gpu_device *vgdev,
> struct virtio_gpu_object **bo_ptr,
> struct virtio_gpu_fence *fence)
> {
> + struct virtio_gpu_object_array *objs = NULL;
> struct virtio_gpu_object *bo;
> + struct ww_acquire_ctx ticket;
> size_t acc_size;
> int ret;
>
> @@ -123,12 +125,29 @@ int virtio_gpu_object_create(struct virtio_gpu_device *vgdev,
> }
> bo->dumb = params->dumb;
>
> + if (fence) {
> + objs = virtio_gpu_array_alloc(1);
> + objs->objs[0] = &bo->gem_base;
> + drm_gem_object_get(objs->objs[0]);
> +
> + ret = drm_gem_lock_reservations(objs->objs, objs->nents,
> + &ticket);
We can use virtio_gpu_object_reserve when there is only one object.
> + if (ret == 0)
> + reservation_object_add_excl_fence(objs->objs[0]->resv,
> + &fence->f);
Similar to in execbuffer, this might need to be moved to after
virtio_gpu_cmd_resource_create_*.
> + }
> +
> if (params->virgl) {
> - virtio_gpu_cmd_resource_create_3d(vgdev, bo, params, fence);
> + virtio_gpu_cmd_resource_create_3d(vgdev, bo, params,
> + objs, fence);
> } else {
> - virtio_gpu_cmd_create_resource(vgdev, bo, params, fence);
> + virtio_gpu_cmd_create_resource(vgdev, bo, params,
> + objs, fence);
> }
>
> + if (fence)
> + drm_gem_unlock_reservations(objs->objs, objs->nents, &ticket);
objs might have been freed.
> +
> virtio_gpu_init_ttm_placement(bo);
> ret = ttm_bo_init(&vgdev->mman.bdev, &bo->tbo, params->size,
> ttm_bo_type_device, &bo->placement, 0,
> @@ -139,38 +158,6 @@ int virtio_gpu_object_create(struct virtio_gpu_device *vgdev,
> if (ret != 0)
> return ret;
>
> - if (fence) {
> - struct virtio_gpu_fence_driver *drv = &vgdev->fence_drv;
> - struct list_head validate_list;
> - struct ttm_validate_buffer mainbuf;
> - struct ww_acquire_ctx ticket;
> - unsigned long irq_flags;
> - bool signaled;
> -
> - INIT_LIST_HEAD(&validate_list);
> - memset(&mainbuf, 0, sizeof(struct ttm_validate_buffer));
> -
> - /* use a gem reference since unref list undoes them */
> - drm_gem_object_get(&bo->gem_base);
> - mainbuf.bo = &bo->tbo;
> - list_add(&mainbuf.head, &validate_list);
> -
> - ret = virtio_gpu_object_list_validate(&ticket, &validate_list);
> - if (ret == 0) {
> - spin_lock_irqsave(&drv->lock, irq_flags);
> - signaled = virtio_fence_signaled(&fence->f);
> - if (!signaled)
> - /* virtio create command still in flight */
> - ttm_eu_fence_buffer_objects(&ticket, &validate_list,
> - &fence->f);
> - spin_unlock_irqrestore(&drv->lock, irq_flags);
> - if (signaled)
> - /* virtio create command finished */
> - ttm_eu_backoff_reservation(&ticket, &validate_list);
> - }
> - virtio_gpu_unref_list(&validate_list);
> - }
> -
> *bo_ptr = bo;
> return 0;
> }
> diff --git a/drivers/gpu/drm/virtio/virtgpu_vq.c b/drivers/gpu/drm/virtio/virtgpu_vq.c
> index 0c87c3e086f8..0a735e51a803 100644
> --- a/drivers/gpu/drm/virtio/virtgpu_vq.c
> +++ b/drivers/gpu/drm/virtio/virtgpu_vq.c
> @@ -391,6 +391,7 @@ static int virtio_gpu_queue_cursor(struct virtio_gpu_device *vgdev,
> void virtio_gpu_cmd_create_resource(struct virtio_gpu_device *vgdev,
> struct virtio_gpu_object *bo,
> struct virtio_gpu_object_params *params,
> + struct virtio_gpu_object_array *objs,
> struct virtio_gpu_fence *fence)
> {
> struct virtio_gpu_resource_create_2d *cmd_p;
> @@ -398,6 +399,7 @@ void virtio_gpu_cmd_create_resource(struct virtio_gpu_device *vgdev,
>
> cmd_p = virtio_gpu_alloc_cmd(vgdev, &vbuf, sizeof(*cmd_p));
> memset(cmd_p, 0, sizeof(*cmd_p));
> + vbuf->objs = objs;
>
> cmd_p->hdr.type = cpu_to_le32(VIRTIO_GPU_CMD_RESOURCE_CREATE_2D);
> cmd_p->resource_id = cpu_to_le32(bo->hw_res_handle);
> @@ -864,6 +866,7 @@ void
> virtio_gpu_cmd_resource_create_3d(struct virtio_gpu_device *vgdev,
> struct virtio_gpu_object *bo,
> struct virtio_gpu_object_params *params,
> + struct virtio_gpu_object_array *objs,
> struct virtio_gpu_fence *fence)
> {
> struct virtio_gpu_resource_create_3d *cmd_p;
> @@ -871,6 +874,7 @@ virtio_gpu_cmd_resource_create_3d(struct virtio_gpu_device *vgdev,
>
> cmd_p = virtio_gpu_alloc_cmd(vgdev, &vbuf, sizeof(*cmd_p));
> memset(cmd_p, 0, sizeof(*cmd_p));
> + vbuf->objs = objs;
>
> cmd_p->hdr.type = cpu_to_le32(VIRTIO_GPU_CMD_RESOURCE_CREATE_3D);
> cmd_p->resource_id = cpu_to_le32(bo->hw_res_handle);
> --
> 2.18.1
>
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