This allows vmwgfx to wait on a fence created by another
device.
v2:
* Remove special handling for vmwgfx fence and just use dma_fence_wait()
* Use interruptible waits
* Added function documentation
Signed-off-by: Sinclair Yeh <s...@vmware.com>
Reviewed-by: Deepak Singh Rawat <dra...@vmware.com>
Reviewed-by: Thomas Hellstrom <thellst...@vmware.com>
---
drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c | 24 ++++++++++++++++--
drivers/gpu/drm/vmwgfx/vmwgfx_fence.c | 45 +++++++++++++++++++++++++++++++++
drivers/gpu/drm/vmwgfx/vmwgfx_fence.h | 4 +++
3 files changed, 71 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c
b/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c
index c8d7fb0..e9cdaa4 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c
@@ -24,6 +24,7 @@
* USE OR OTHER DEALINGS IN THE SOFTWARE.
*
**************************************************************************/
+#include <linux/sync_file.h>
#include "vmwgfx_drv.h"
#include "vmwgfx_reg.h"
@@ -4414,6 +4415,7 @@ int vmw_execbuf_ioctl(struct drm_device *dev, unsigned
long data,
static const size_t copy_offset[] = {
offsetof(struct drm_vmw_execbuf_arg, context_handle),
sizeof(struct drm_vmw_execbuf_arg)};
+ struct dma_fence *in_fence = NULL;
if (unlikely(size < copy_offset[0])) {
DRM_ERROR("Invalid command size, ioctl %d\n",
@@ -4453,6 +4455,21 @@ int vmw_execbuf_ioctl(struct drm_device *dev, unsigned
long data,
break;
}
+
+ /* If imported a fence FD from elsewhere, then wait on it */
+ if (arg.flags & DRM_VMW_EXECBUF_FLAG_IMPORT_FENCE_FD) {
+ in_fence = sync_file_get_fence(arg.imported_fence_fd);
+
+ if (!in_fence) {
+ DRM_ERROR("Cannot get imported fence\n");
+ return -EINVAL;
+ }
+
+ ret = vmw_wait_dma_fence(dev_priv->fman, in_fence);
+ if (ret)
+ goto out;
+ }
+
ret = ttm_read_lock(&dev_priv->reservation_sem, true);
if (unlikely(ret != 0))
return ret;
@@ -4465,9 +4482,12 @@ int vmw_execbuf_ioctl(struct drm_device *dev, unsigned
long data,
NULL);
ttm_read_unlock(&dev_priv->reservation_sem);
if (unlikely(ret != 0))
- return ret;
+ goto out;
vmw_kms_cursor_post_execbuf(dev_priv);
- return 0;
+out:
+ if (in_fence)
+ dma_fence_put(in_fence);
+ return ret;
}
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_fence.c
b/drivers/gpu/drm/vmwgfx/vmwgfx_fence.c
index e83841a..e62f027 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_fence.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_fence.c
@@ -644,6 +644,51 @@ int vmw_user_fence_create(struct drm_file *file_priv,
/**
+ * vmw_wait_dma_fence - Wait for a dma fence
+ *
+ * @fman: pointer to a fence manager
+ * @fence: DMA fence to wait on
+ *
+ * This function handles the case when the fence is actually a fence
+ * array. If that's the case, it'll wait on each of the child fence
+ */
+int vmw_wait_dma_fence(struct vmw_fence_manager *fman,
+ struct dma_fence *fence)
+{
+ struct dma_fence_array *fence_array;
+ int ret = 0;
+ int i;
+
+
+ if (dma_fence_is_signaled(fence))
+ return 0;
+
+ if (!dma_fence_is_array(fence))
+ return dma_fence_wait(fence, true);
+
+ /* From i915: Note that if the fence-array was created in
+ * signal-on-any mode, we should *not* decompose it into its individual
+ * fences. However, we don't currently store which mode the fence-array
+ * is operating in. Fortunately, the only user of signal-on-any is
+ * private to amdgpu and we should not see any incoming fence-array
+ * from sync-file being in signal-on-any mode.
+ */
+
+ fence_array = to_dma_fence_array(fence);
+ for (i = 0; i < fence_array->num_fences; i++) {
+ struct dma_fence *child = fence_array->fences[i];
+
+ ret = dma_fence_wait(child, true);
+
+ if (ret < 0)
+ return ret;
+ }
+
+ return 0;
+}
+
+
+/**
* vmw_fence_fifo_down - signal all unsignaled fence objects.
*/
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_fence.h
b/drivers/gpu/drm/vmwgfx/vmwgfx_fence.h
index d9d85aa..20224db 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_fence.h
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_fence.h
@@ -28,6 +28,7 @@
#ifndef _VMWGFX_FENCE_H_
#include <linux/dma-fence.h>
+#include <linux/dma-fence-array.h>
#define VMW_FENCE_WAIT_TIMEOUT (5*HZ)
@@ -102,6 +103,9 @@ extern int vmw_user_fence_create(struct drm_file *file_priv,
struct vmw_fence_obj **p_fence,
uint32_t *p_handle);
+extern int vmw_wait_dma_fence(struct vmw_fence_manager *fman,
+ struct dma_fence *fence);
+
extern void vmw_fence_fifo_up(struct vmw_fence_manager *fman);
extern void vmw_fence_fifo_down(struct vmw_fence_manager *fman);
--
2.7.4
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