Allow user space to provide an explicit sync fence fd when exporting
a dma-buf from gem handle. The fence will be stored as the explicit
fence to the reservation object.
Signed-off-by: Lauri Peltonen <lpelto...@nvidia.com>
---
drivers/gpu/drm/drm_prime.c | 41 +++++++++++++++++++++++++++++++++--------
include/uapi/drm/drm.h | 9 ++++++++-
2 files changed, 41 insertions(+), 9 deletions(-)
diff --git a/drivers/gpu/drm/drm_prime.c b/drivers/gpu/drm/drm_prime.c
index 2807a77..c69df2e 100644
--- a/drivers/gpu/drm/drm_prime.c
+++ b/drivers/gpu/drm/drm_prime.c
@@ -28,8 +28,10 @@
#include <linux/export.h>
#include <linux/dma-buf.h>
+#include <linux/reservation.h>
#include <drm/drmP.h>
#include "drm_internal.h"
+#include "../../staging/android/sync.h"
/*
* DMA-BUF/GEM Object references and lifetime overview:
@@ -329,7 +331,7 @@ static const struct dma_buf_ops drm_gem_prime_dmabuf_ops =
{
* drm_gem_prime_export - helper library implemention of the export callback
* @dev: drm_device to export from
* @obj: GEM object to export
- * @flags: flags like DRM_CLOEXEC
+ * @flags: flags like DRM_CLOEXEC or DRM_SYNC_FD
*
* This is the implementation of the gem_prime_export functions for GEM drivers
* using the PRIME helpers.
@@ -385,7 +387,7 @@ static struct dma_buf *export_and_register_object(struct
drm_device *dev,
* @dev: dev to export the buffer from
* @file_priv: drm file-private structure
* @handle: buffer handle to export
- * @flags: flags like DRM_CLOEXEC
+ * @flags: flags like DRM_CLOEXEC or DRM_SYNC_FD
* @prime_fd: pointer to storage for the fd id of the create dma-buf
*
* This is the PRIME export function which must be used mandatorily by GEM
@@ -401,6 +403,24 @@ int drm_gem_prime_handle_to_fd(struct drm_device *dev,
struct drm_gem_object *obj;
int ret = 0;
struct dma_buf *dmabuf;
+ struct fence *fence = NULL;
+
+ if (flags & DRM_SYNC_FD) {
+#ifdef CONFIG_SYNC
+ struct sync_fence *sf = sync_fence_fdget(*prime_fd);
+ if (!sf)
+ return -ENOENT;
+ if (sf->num_fences != 1) {
+ sync_fence_put(sf);
+ return -EINVAL;
+ }
+ fence = fence_get(sf->cbs[0].sync_pt);
+ sync_fence_put(sf);
+ flags &= ~DRM_SYNC_FD;
+#else
+ return -ENODEV;
+#endif
+ }
mutex_lock(&file_priv->prime.lock);
obj = drm_gem_object_lookup(dev, file_priv, handle);
@@ -453,6 +473,14 @@ out_have_obj:
goto fail_put_dmabuf;
out_have_handle:
+ if (fence) {
+ if (!dmabuf->resv) {
+ ret = -ENODEV;
+ goto fail_put_dmabuf;
+ }
+ reservation_object_add_excl_fence(dmabuf->resv, fence);
+ }
+
ret = dma_buf_fd(dmabuf, flags);
/*
* We must _not_ remove the buffer from the handle cache since the newly
@@ -475,6 +503,7 @@ out:
drm_gem_object_unreference_unlocked(obj);
out_unlock:
mutex_unlock(&file_priv->prime.lock);
+ fence_put(fence);
return ret;
}
@@ -624,7 +653,6 @@ int drm_prime_handle_to_fd_ioctl(struct drm_device *dev,
void *data,
struct drm_file *file_priv)
{
struct drm_prime_handle *args = data;
- uint32_t flags;
if (!drm_core_check_feature(dev, DRIVER_PRIME))
return -EINVAL;
@@ -633,14 +661,11 @@ int drm_prime_handle_to_fd_ioctl(struct drm_device *dev,
void *data,
return -ENOSYS;
/* check flags are valid */
- if (args->flags & ~DRM_CLOEXEC)
+ if (args->flags & ~(DRM_CLOEXEC | DRM_SYNC_FD))
return -EINVAL;
- /* we only want to pass DRM_CLOEXEC which is == O_CLOEXEC */
- flags = args->flags & DRM_CLOEXEC;
-
return dev->driver->prime_handle_to_fd(dev, file_priv,
- args->handle, flags, &args->fd);
+ args->handle, args->flags, &args->fd);
}
int drm_prime_fd_to_handle_ioctl(struct drm_device *dev, void *data,
diff --git a/include/uapi/drm/drm.h b/include/uapi/drm/drm.h
index b0b8556..a11b893 100644
--- a/include/uapi/drm/drm.h
+++ b/include/uapi/drm/drm.h
@@ -661,13 +661,20 @@ struct drm_set_client_cap {
};
#define DRM_CLOEXEC O_CLOEXEC
+#define DRM_SYNC_FD O_DSYNC
struct drm_prime_handle {
__u32 handle;
/** Flags.. only applicable for handle->fd */
__u32 flags;
- /** Returned dmabuf file descriptor */
+ /**
+ * DRM_IOCTL_PRIME_FD_TO_HANDLE:
+ * in: dma-buf fd
+ * DRM_IOCTL_PRIME_HANDLE_TO_FD:
+ * in: sync fence fd if DRM_SYNC_FD flag is passed
+ * out: dma-buf fd
+ */
__s32 fd;
};
--
1.8.1.5
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