Re: [PATCH 10/11] drm/syncobj: add timeline signal ioctl for syncobj

[Christian König <ckoenig.leichtzumerken@xxxxxxxxx>]

Am 07.12.18 um 10:56 schrieb Chunming Zhou:
> Signed-off-by: Chunming Zhou <david1.zhou@xxxxxxx>
> ---
>   drivers/gpu/drm/drm_internal.h |  2 +
>   drivers/gpu/drm/drm_ioctl.c    |  2 +
>   drivers/gpu/drm/drm_syncobj.c  | 70 ++++++++++++++++++++++++++++++++++
>   include/uapi/drm/drm.h         |  1 +
>   4 files changed, 75 insertions(+)
>
> diff --git a/drivers/gpu/drm/drm_internal.h b/drivers/gpu/drm/drm_internal.h
> index ecbe3d51a702..149c2f589ec9 100644
> --- a/drivers/gpu/drm/drm_internal.h
> +++ b/drivers/gpu/drm/drm_internal.h
> @@ -188,6 +188,8 @@ 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 6b417e3c3ea5..d05586601eb5 100644
> --- a/drivers/gpu/drm/drm_ioctl.c
> +++ b/drivers/gpu/drm/drm_ioctl.c
> @@ -687,6 +687,8 @@ 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 cf4daa670252..238ed89593a7 100644
> --- a/drivers/gpu/drm/drm_syncobj.c
> +++ b/drivers/gpu/drm/drm_syncobj.c
> @@ -1165,6 +1165,76 @@ 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, timeline_count = 0;
> +	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;
> +	}
> +
> +
> +	for (i = 0; i < args->count_handles; i++) {
> +		if (points[i])
> +			timeline_count++;
> +	}
> +	chains = kmalloc_array(timeline_count, sizeof(*chains), GFP_KERNEL);

I don't think that this will work. We need individually allocated chain 
objects.

Apart from that this looks good to me,
Christian.

> +	if (!chains) {
> +		ret = -ENOMEM;
> +		goto err_points;
> +	}
> +
> +	for (i = 0, j = 0; i < args->count_handles; i++) {
> +		if (points[i]) {
> +			struct dma_fence *fence = dma_fence_get_stub();
> +
> +			drm_syncobj_add_point(syncobjs[i], &chains[j++],
> +					      fence, points[i]);
> +			dma_fence_put(fence);
> +		} else
> +			drm_syncobj_assign_null_handle(syncobjs[i]);
> +	}
> +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 88d6129d4a18..9a5fa3c26f22 100644
> --- a/include/uapi/drm/drm.h
> +++ b/include/uapi/drm/drm.h
> @@ -943,6 +943,7 @@ extern "C" {
>   #define DRM_IOCTL_SYNCOBJ_QUERY		DRM_IOWR(0xCB, struct drm_syncobj_timeline_array)
>   #define DRM_IOCTL_SYNCOBJ_BINARY_TO_TIMELINE	DRM_IOWR(0xCC, struct drm_syncobj_transfer)
>   #define DRM_IOCTL_SYNCOBJ_TIMELINE_TO_BINARY	DRM_IOWR(0xCD, struct drm_syncobj_transfer)
> +#define DRM_IOCTL_SYNCOBJ_TIMELINE_SIGNAL	DRM_IOWR(0xCE, struct drm_syncobj_timeline_array)
>   
>   /**
>    * Device specific ioctls should only be in their respective headers

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