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dma-buf: fence debugging

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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
This commit is contained in:
Russell King 2017-03-31 11:00:42 +01:00 committed by Gustavo Padovan
parent b121b051d1
commit 5eb2c72c8a
1 changed files with 33 additions and 1 deletions
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34
drivers/dma-buf/dma-buf.c
View File

@ -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;