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;