linux-kernel - [PATCH] drm/virtio: Add execbuf flag to request no fence-event

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Date:   Tue,  5 Apr 2022 10:39:18 -0700
From:   Rob Clark <robdclark@...il.com>
To:     dri-devel@...ts.freedesktop.org
Cc:     Rob Clark <robdclark@...omium.org>,
        David Airlie <airlied@...ux.ie>,
        Gerd Hoffmann <kraxel@...hat.com>,
        Gurchetan Singh <gurchetansingh@...omium.org>,
        Chia-I Wu <olvaffe@...il.com>, Daniel Vetter <daniel@...ll.ch>,
        virtualization@...ts.linux-foundation.org (open list:VIRTIO GPU DRIVER),
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH] drm/virtio: Add execbuf flag to request no fence-event

From: Rob Clark <robdclark@...omium.org>

It would have been cleaner to have a flag to *request* the fence event.
But that ship has sailed.  So add a flag so that userspace which doesn't
care about the events can opt-out.

Signed-off-by: Rob Clark <robdclark@...omium.org>
---
 drivers/gpu/drm/virtio/virtgpu_ioctl.c | 8 +++++---
 include/uapi/drm/virtgpu_drm.h         | 2 ++
 2 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/virtio/virtgpu_ioctl.c b/drivers/gpu/drm/virtio/virtgpu_ioctl.c
index 3a8078f2ee27..09f1aa263f91 100644
--- a/drivers/gpu/drm/virtio/virtgpu_ioctl.c
+++ b/drivers/gpu/drm/virtio/virtgpu_ioctl.c
@@ -225,9 +225,11 @@ static int virtio_gpu_execbuffer_ioctl(struct drm_device *dev, void *data,
 		goto out_unresv;
 	}
 
-	ret = virtio_gpu_fence_event_create(dev, file, out_fence, ring_idx);
-	if (ret)
-		goto out_unresv;
+	if (!(exbuf->flags & VIRTGPU_EXECBUF_NO_EVENT)) {
+		ret = virtio_gpu_fence_event_create(dev, file, out_fence, ring_idx);
+		if (ret)
+			goto out_unresv;
+	}
 
 	if (out_fence_fd >= 0) {
 		sync_file = sync_file_create(&out_fence->f);
diff --git a/include/uapi/drm/virtgpu_drm.h b/include/uapi/drm/virtgpu_drm.h
index 0512fde5e697..d06cac3407cc 100644
--- a/include/uapi/drm/virtgpu_drm.h
+++ b/include/uapi/drm/virtgpu_drm.h
@@ -52,10 +52,12 @@ extern "C" {
 #define VIRTGPU_EXECBUF_FENCE_FD_IN	0x01
 #define VIRTGPU_EXECBUF_FENCE_FD_OUT	0x02
 #define VIRTGPU_EXECBUF_RING_IDX	0x04
+#define VIRTGPU_EXECBUF_NO_EVENT	0x08
 #define VIRTGPU_EXECBUF_FLAGS  (\
 		VIRTGPU_EXECBUF_FENCE_FD_IN |\
 		VIRTGPU_EXECBUF_FENCE_FD_OUT |\
 		VIRTGPU_EXECBUF_RING_IDX |\
+		VIRTGPU_EXECBUF_NO_EVENT |\
 		0)
 
 struct drm_virtgpu_map {
-- 
2.35.1