[PATCH 1/2] drm/virtgpu api: define a dummy fence signaled event

[Gurchetan Singh]

From: Gurchetan Singh <gurchetansingh at chromium.org>

The current virtgpu implementation of poll(..) drops events
when VIRTGPU_CONTEXT_PARAM_POLL_RINGS_MASK is enabled (otherwise
it's like a normal DRM driver).

This is because paravirtualized userspaces receives responses in a
buffer of type BLOB_MEM_GUEST, not by read(..).

To be in line with other DRM drivers and avoid specialized behavior,
it is possible to define a dummy event for virtgpu.  Paravirtualized
userspace will now have to call read(..) on the DRM fd to receive the
dummy event.

Fixes: b10790434cf2 ("drm/virtgpu api: create context init feature")
Reported-by: Daniel Vetter <daniel.vetter at ffwll.ch>
Signed-off-by: Gurchetan Singh <gurchetansingh at chromium.org>
---
 drivers/gpu/drm/virtio/virtgpu_drv.h   | 1 -
 drivers/gpu/drm/virtio/virtgpu_ioctl.c | 2 +-
 include/uapi/drm/virtgpu_drm.h         | 7 +++++++
 3 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/virtio/virtgpu_drv.h b/drivers/gpu/drm/virtio/virtgpu_drv.h
index e0265fe74aa5..0a194aaad419 100644
--- a/drivers/gpu/drm/virtio/virtgpu_drv.h
+++ b/drivers/gpu/drm/virtio/virtgpu_drv.h
@@ -138,7 +138,6 @@ struct virtio_gpu_fence_driver {
 	spinlock_t       lock;
 };
 
-#define VIRTGPU_EVENT_FENCE_SIGNALED_INTERNAL 0x10000000
 struct virtio_gpu_fence_event {
 	struct drm_pending_event base;
 	struct drm_event event;
diff --git a/drivers/gpu/drm/virtio/virtgpu_ioctl.c b/drivers/gpu/drm/virtio/virtgpu_ioctl.c
index 5618a1d5879c..3607646d3229 100644
--- a/drivers/gpu/drm/virtio/virtgpu_ioctl.c
+++ b/drivers/gpu/drm/virtio/virtgpu_ioctl.c
@@ -54,7 +54,7 @@ static int virtio_gpu_fence_event_create(struct drm_device *dev,
 	if (!e)
 		return -ENOMEM;
 
-	e->event.type = VIRTGPU_EVENT_FENCE_SIGNALED_INTERNAL;
+	e->event.type = VIRTGPU_EVENT_FENCE_SIGNALED;
 	e->event.length = sizeof(e->event);
 
 	ret = drm_event_reserve_init(dev, file, &e->base, &e->event);
diff --git a/include/uapi/drm/virtgpu_drm.h b/include/uapi/drm/virtgpu_drm.h
index a13e20cc66b4..0512fde5e697 100644
--- a/include/uapi/drm/virtgpu_drm.h
+++ b/include/uapi/drm/virtgpu_drm.h
@@ -196,6 +196,13 @@ struct drm_virtgpu_context_init {
 	__u64 ctx_set_params;
 };
 
+/*
+ * Event code that's given when VIRTGPU_CONTEXT_PARAM_POLL_RINGS_MASK is in
+ * effect.  The event size is sizeof(drm_event), since there is no additional
+ * payload.
+ */
+#define VIRTGPU_EVENT_FENCE_SIGNALED 0x90000000
+
 #define DRM_IOCTL_VIRTGPU_MAP \
 	DRM_IOWR(DRM_COMMAND_BASE + DRM_VIRTGPU_MAP, struct drm_virtgpu_map)
 
-- 
2.34.0.rc2.393.gf8c9666880-goog