Re: [PATCH 06/11] drm/syncobj: add timeline payload query ioctl v4

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On 07/12/2018 09:55, Chunming Zhou wrote:
user mode can query timeline payload.
v2: check return value of copy_to_user
v3: handle querying entry by entry
v4: rebase on new chain container, simplify interface

Signed-off-by: Chunming Zhou <david1.zhou@xxxxxxx>
Cc: Daniel Rakos <Daniel.Rakos@xxxxxxx>
Cc: Jason Ekstrand <jason@xxxxxxxxxxxxxx>
Cc: Bas Nieuwenhuizen <bas@xxxxxxxxxxxxxxxxxxx>
Cc: Dave Airlie <airlied@xxxxxxxxxx>
Cc: Christian König <christian.koenig@xxxxxxx>
Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
---
  drivers/gpu/drm/drm_internal.h |  2 ++
  drivers/gpu/drm/drm_ioctl.c    |  2 ++
  drivers/gpu/drm/drm_syncobj.c  | 43 ++++++++++++++++++++++++++++++++++
  include/uapi/drm/drm.h         | 10 ++++++++
  4 files changed, 57 insertions(+)

diff --git a/drivers/gpu/drm/drm_internal.h b/drivers/gpu/drm/drm_internal.h
index 18b41e10195c..dab4d5936441 100644
--- a/drivers/gpu/drm/drm_internal.h
+++ b/drivers/gpu/drm/drm_internal.h
@@ -184,6 +184,8 @@ int drm_syncobj_reset_ioctl(struct drm_device *dev, void *data,
  			    struct drm_file *file_private);
  int drm_syncobj_signal_ioctl(struct drm_device *dev, void *data,
  			     struct drm_file *file_private);
+int drm_syncobj_query_ioctl(struct drm_device *dev, void *data,
+			    struct drm_file *file_private);
/* drm_framebuffer.c */
  void drm_framebuffer_print_info(struct drm_printer *p, unsigned int indent,
diff --git a/drivers/gpu/drm/drm_ioctl.c b/drivers/gpu/drm/drm_ioctl.c
index a9a17ed35cc4..7578ef6dc1d1 100644
--- a/drivers/gpu/drm/drm_ioctl.c
+++ b/drivers/gpu/drm/drm_ioctl.c
@@ -681,6 +681,8 @@ static const struct drm_ioctl_desc drm_ioctls[] = {
  		      DRM_UNLOCKED|DRM_RENDER_ALLOW),
  	DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_SIGNAL, drm_syncobj_signal_ioctl,
  		      DRM_UNLOCKED|DRM_RENDER_ALLOW),
+	DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_QUERY, drm_syncobj_query_ioctl,
+		      DRM_UNLOCKED|DRM_RENDER_ALLOW),
  	DRM_IOCTL_DEF(DRM_IOCTL_CRTC_GET_SEQUENCE, drm_crtc_get_sequence_ioctl, DRM_UNLOCKED),
  	DRM_IOCTL_DEF(DRM_IOCTL_CRTC_QUEUE_SEQUENCE, drm_crtc_queue_sequence_ioctl, DRM_UNLOCKED),
  	DRM_IOCTL_DEF(DRM_IOCTL_MODE_CREATE_LEASE, drm_mode_create_lease_ioctl, DRM_MASTER|DRM_UNLOCKED),
diff --git a/drivers/gpu/drm/drm_syncobj.c b/drivers/gpu/drm/drm_syncobj.c
index 348079bb0965..f97fa00ca1d0 100644
--- a/drivers/gpu/drm/drm_syncobj.c
+++ b/drivers/gpu/drm/drm_syncobj.c
@@ -1061,3 +1061,46 @@ drm_syncobj_signal_ioctl(struct drm_device *dev, void *data,
return ret;
  }
+
+int drm_syncobj_query_ioctl(struct drm_device *dev, void *data,
+			    struct drm_file *file_private)
+{
+	struct drm_syncobj_timeline_array *args = data;
+	struct drm_syncobj **syncobjs;
+	uint64_t __user *points = u64_to_user_ptr(args->points);
+	uint32_t i;
+	int ret;
+
+	if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ))
+		return -ENODEV;
+
+	if (args->pad != 0)
+		return -EINVAL;
+
+	if (args->count_handles == 0)
+		return -EINVAL;
+
+	ret = drm_syncobj_array_find(file_private,
+				     u64_to_user_ptr(args->handles),
+				     args->count_handles,
+				     &syncobjs);
+	if (ret < 0)
+		return ret;
+
+	for (i = 0; i < args->count_handles; i++) {
+		struct dma_fence_chain *chain;
+		struct dma_fence *fence;
+		uint64_t point;
+
+		fence = drm_syncobj_fence_get(syncobjs[i]);
+		chain = to_dma_fence_chain(fence);
+		point = chain ? fence->seqno : 0;


Sorry, I don' t want to sound annoying, but this looks like this could report values going backward.

Anything add a point X to a timeline that has reached value Y with X < Y would trigger that.

Either through the submission or userspace signaling or importing another syncpoint's fence.


-Lionel


+		ret = copy_to_user(&points[i], &point, sizeof(uint64_t));
+		ret = ret ? -EFAULT : 0;
+		if (ret)
+			break;
+	}
+	drm_syncobj_array_free(syncobjs, args->count_handles);
+
+	return ret;
+}
diff --git a/include/uapi/drm/drm.h b/include/uapi/drm/drm.h
index 0092111d002c..b2c36f2b2599 100644
--- a/include/uapi/drm/drm.h
+++ b/include/uapi/drm/drm.h
@@ -767,6 +767,14 @@ struct drm_syncobj_array {
  	__u32 pad;
  };
+struct drm_syncobj_timeline_array {
+	__u64 handles;
+	__u64 points;
+	__u32 count_handles;
+	__u32 pad;
+};
+
+
  /* Query current scanout sequence number */
  struct drm_crtc_get_sequence {
  	__u32 crtc_id;		/* requested crtc_id */
@@ -924,6 +932,8 @@ extern "C" {
  #define DRM_IOCTL_MODE_REVOKE_LEASE	DRM_IOWR(0xC9, struct drm_mode_revoke_lease)
#define DRM_IOCTL_SYNCOBJ_TIMELINE_WAIT DRM_IOWR(0xCA, struct drm_syncobj_timeline_wait)
+#define DRM_IOCTL_SYNCOBJ_QUERY		DRM_IOWR(0xCB, struct drm_syncobj_timeline_array)
+
  /**
   * Device specific ioctls should only be in their respective headers
   * The device specific ioctl range is from 0x40 to 0x9f.


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