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dma-buf: add reservation_object_fences helper

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Add a new helper to get a consistent set of pointers from the reservation
object. While at it group all access helpers together in the header file.

v2: correctly return shared_count as well

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/322378/?series=64837&rev=1
This commit is contained in:
Christian König
2019-08-06 14:19:33 +02:00
parent 0e2f733add
commit 67c97fb79a
3 changed files with 101 additions and 127 deletions
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31
drivers/dma-buf/dma-buf.c
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@@ -199,7 +199,7 @@ static __poll_t dma_buf_poll(struct file *file, poll_table *poll)
struct reservation_object_list *fobj;
struct dma_fence *fence_excl;
__poll_t events;
unsigned shared_count, seq;
unsigned shared_count;
dmabuf = file->private_data;
if (!dmabuf || !dmabuf->resv)
@@ -213,21 +213,8 @@ static __poll_t dma_buf_poll(struct file *file, poll_table *poll)
if (!events)
return 0;
retry:
seq = read_seqcount_begin(&resv->seq);
rcu_read_lock();
fobj = rcu_dereference(resv->fence);
if (fobj)
shared_count = fobj->shared_count;
else
shared_count = 0;
fence_excl = rcu_dereference(resv->fence_excl);
if (read_seqcount_retry(&resv->seq, seq)) {
rcu_read_unlock();
goto retry;
}
reservation_object_fences(resv, &fence_excl, &fobj, &shared_count);
if (fence_excl && (!(events & EPOLLOUT) || shared_count == 0)) {
struct dma_buf_poll_cb_t *dcb = &dmabuf->cb_excl;
__poll_t pevents = EPOLLIN;
@@ -1157,7 +1144,6 @@ static int dma_buf_debug_show(struct seq_file *s, void *unused)
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;
@@ -1188,16 +1174,9 @@ static int dma_buf_debug_show(struct seq_file *s, void *unused)
buf_obj->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();
}
rcu_read_lock();
reservation_object_fences(robj, &fence, &fobj, &shared_count);
rcu_read_unlock();
if (fence)
seq_printf(s, "\tExclusive fence: %s %s %ssignalled\n",