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| author | Russell King <rmk+kernel@arm.linux.org.uk> | 2017-03-31 13:00:42 +0300 |
|---|---|---|
| committer | Gustavo Padovan <gustavo.padovan@collabora.com> | 2017-03-31 18:52:22 +0300 |
| commit | 5eb2c72c8acc3f84c85f9d504b87f25f78ef0eb0 (patch) | |
| tree | 4a3b3cdf9fb08d0b62376e6ffebe65acd209706a /drivers/dma-buf/dma-buf.c | |
| parent | b121b051d14cc6e4e799e96e9c06c55989f9e073 (diff) | |
| download | linux-5eb2c72c8acc3f84c85f9d504b87f25f78ef0eb0.tar.xz | |
dma-buf: fence debugging
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>
Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.com>
Link: http://patchwork.freedesktop.org/patch/msgid/E1cttMI-00068z-3X@rmk-PC.armlinux.org.uk
Diffstat (limited to 'drivers/dma-buf/dma-buf.c')
| -rw-r--r-- | drivers/dma-buf/dma-buf.c | 34 |
1 files changed, 33 insertions, 1 deletions
diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c index 0007b792827b..ebaf1923ad6b 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 +1089,34 @@ 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; |