On 25/03/2019 08:32, Chunming Zhou wrote:
v2: individually allocate chain array, since chain node is free independently.
v3: all existing points must be already signaled before cpu perform signal
operation,
so add check condition for that.
v4: remove v3 change and add checking to prevent out-of-order
v5: unify binary and timeline
Signed-off-by: Chunming Zhou <david1.z...@amd.com>
Cc: Tobias Hector <tobias.hec...@amd.com>
Cc: Jason Ekstrand <ja...@jlekstrand.net>
Cc: Dave Airlie <airl...@redhat.com>
Cc: Chris Wilson <ch...@chris-wilson.co.uk>
Cc: Lionel Landwerlin <lionel.g.landwer...@intel.com>
---
drivers/gpu/drm/drm_internal.h | 2 +
drivers/gpu/drm/drm_ioctl.c | 2 +
drivers/gpu/drm/drm_syncobj.c | 73 ++++++++++++++++++++++++++++++++++
include/uapi/drm/drm.h | 1 +
4 files changed, 78 insertions(+)
diff --git a/drivers/gpu/drm/drm_internal.h b/drivers/gpu/drm/drm_internal.h
index dd11ae5f1eef..d9a483a5fce0 100644
--- a/drivers/gpu/drm/drm_internal.h
+++ b/drivers/gpu/drm/drm_internal.h
@@ -190,6 +190,8 @@ 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_timeline_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);
diff --git a/drivers/gpu/drm/drm_ioctl.c b/drivers/gpu/drm/drm_ioctl.c
index 92b3b7b2fd81..d337f161909c 100644
--- a/drivers/gpu/drm/drm_ioctl.c
+++ b/drivers/gpu/drm/drm_ioctl.c
@@ -696,6 +696,8 @@ 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_TIMELINE_SIGNAL,
drm_syncobj_timeline_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),
diff --git a/drivers/gpu/drm/drm_syncobj.c b/drivers/gpu/drm/drm_syncobj.c
index ee2d66e047e7..099596190845 100644
--- a/drivers/gpu/drm/drm_syncobj.c
+++ b/drivers/gpu/drm/drm_syncobj.c
@@ -1183,6 +1183,79 @@ drm_syncobj_signal_ioctl(struct drm_device *dev, void
*data,
return ret;
}
+int
+drm_syncobj_timeline_signal_ioctl(struct drm_device *dev, void *data,
+ struct drm_file *file_private)
+{
+ struct drm_syncobj_timeline_array *args = data;
+ struct drm_syncobj **syncobjs;
+ struct dma_fence_chain **chains;
+ uint64_t *points;
+ uint32_t i, j;
+ int ret;
+
+ if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ))
+ return -EOPNOTSUPP;
+
+ 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;
+
+ points = kmalloc_array(args->count_handles, sizeof(*points),
+ GFP_KERNEL);
+ if (!points) {
+ ret = -ENOMEM;
+ goto out;
+ }
+ if (!u64_to_user_ptr(args->points)) {
+ memset(points, 0, args->count_handles * sizeof(uint64_t));
+ } else if (copy_from_user(points, u64_to_user_ptr(args->points),
+ sizeof(uint64_t) * args->count_handles)) {
+ ret = -EFAULT;
+ goto err_points;
+ }
+
+ chains = kmalloc_array(args->count_handles, sizeof(void *), GFP_KERNEL);
+ if (!chains) {
+ ret = -ENOMEM;
+ goto err_points;
+ }
+ for (i = 0; i < args->count_handles; i++) {
+ chains[i] = kzalloc(sizeof(struct dma_fence_chain), GFP_KERNEL);
+ if (!chains[i]) {
+ for (j = 0; j < i; j++)
+ kfree(chains[j]);
+ ret = -ENOMEM;
+ goto err_chains;
+ }
+ }
+
+ for (i = 0; i < args->count_handles; i++) {
+ struct dma_fence *fence = dma_fence_get_stub();
+
+ drm_syncobj_add_point(syncobjs[i], chains[i],
+ fence, points[i]);
+ dma_fence_put(fence);
+ }
I think I found an issue where the implementation doesn't match what the
spec requires on host signaling.
Consider the following :
Timeline semaphore has a value of 4.
A device submits a commands to signal point 5.
The host signals point 6.
The value of the timeline will remain 4 until the device commands
complete, at which point it will change to 6.
But the specification seems to say that the timeline value should be 6
once the host signaling completes.
The only option that I see working would be to add point 6 in the
timeline and wait on that point to complete.
Christian, David, what do you think?
Thanks,
-Lionel
+err_chains:
+ kfree(chains);
+err_points:
+ kfree(points);
+out:
+ drm_syncobj_array_free(syncobjs, args->count_handles);
+
+ return ret;
+}
+
int drm_syncobj_query_ioctl(struct drm_device *dev, void *data,
struct drm_file *file_private)
{
diff --git a/include/uapi/drm/drm.h b/include/uapi/drm/drm.h
index e8d0d6b51875..236b01a1fabf 100644
--- a/include/uapi/drm/drm.h
+++ b/include/uapi/drm/drm.h
@@ -943,6 +943,7 @@ extern "C" {
#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)
#define DRM_IOCTL_SYNCOBJ_TRANSFER DRM_IOWR(0xCC, struct
drm_syncobj_transfer)
+#define DRM_IOCTL_SYNCOBJ_TIMELINE_SIGNAL DRM_IOWR(0xCD, struct
drm_syncobj_timeline_array)
/**
* Device specific ioctls should only be in their respective headers
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