Am 31.03.2017 um 12:00 schrieb Russell King:

Add debugfs output to report shared and exclusive fences on a dma_buf object. This produces output such as:

Dma-buf Objects: size flags mode count exp_name 08294400 00000000 00000005 00000005 drm Exclusive fence: etnaviv 134000.gpu signalled Attached Devices: gpu-subsystem Total 1 devices attached

Total 1 objects, 8294400 bytes

Signed-off-by: Russell King rmk+kernel@arm.linux.org.uk

Reviewed-by: Christian König christian.koenig@amd.com

---

drivers/dma-buf/dma-buf.c | 34 +++++++++++++++++++++++++++++++++- 1 file changed, 33 insertions(+), 1 deletions(-)

diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c index 0007b792827b..f72aaacbe023 100644 --- a/drivers/dma-buf/dma-buf.c +++ b/drivers/dma-buf/dma-buf.c @@ -1059,7 +1059,11 @@ static int dma_buf_debug_show(struct seq_file *s, void *unused) int ret; struct dma_buf *buf_obj; struct dma_buf_attachment *attach_obj;

• int count = 0, attach_count;

• struct reservation_object *robj;

• struct reservation_object_list *fobj;

• struct dma_fence *fence;

• unsigned seq;

• int count = 0, attach_count, shared_count, i; size_t size = 0;

  ret = mutex_lock_interruptible(&db_list.lock);

@@ -1085,6 +1090,34 @@ static int dma_buf_debug_show(struct seq_file *s, void *unused) file_count(buf_obj->file), buf_obj->exp_name);

• robj = buf_obj->resv;
  

• while (true) {
  

• 	seq = read_seqcount_begin(&robj->seq);
  

• 	rcu_read_lock();
  

• 	fobj = rcu_dereference(robj->fence);
  

• 	shared_count = fobj ? fobj->shared_count : 0;
  

• 	fence = rcu_dereference(robj->fence_excl);
  

• 	if (!read_seqcount_retry(&robj->seq, seq))
  

• 		break;
  

• 	rcu_read_unlock();
  

• }
  

• if (fence)
  

• 	seq_printf(s, "\tExclusive fence: %s %s %ssignalled\n",
  

• 		   fence->ops->get_driver_name(fence),
  

• 		   fence->ops->get_timeline_name(fence),
  

• 		   dma_fence_is_signaled(fence) ? "" : "un");
  

• for (i = 0; i < shared_count; i++) {
  

• 	fence = rcu_dereference(fobj->shared[i]);
  

• 	if (!dma_fence_get_rcu(fence))
  

• 		continue;
  

• 	seq_printf(s, "\tShared fence: %s %s %ssignalled\n",
  

• 		   fence->ops->get_driver_name(fence),
  

• 		   fence->ops->get_timeline_name(fence),
  

• 		   dma_fence_is_signaled(fence) ? "" : "un");
  

• }
  

• rcu_read_unlock();
  

• seq_puts(s, "\tAttached Devices:\n"); attach_count = 0;