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authorMaarten Lankhorst <maarten.lankhorst@canonical.com>2014-07-01 12:57:54 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-07-08 13:37:35 -0700
commit04a5faa8cbe5a8eaf152cb88959ba6360c26e702 (patch)
treefee24a356ead0c38b98d8c3d3b671cd0dd981714 /drivers/dma-buf/dma-buf.c
parent9b495a5887994a6d74d5c261d012083a92b94738 (diff)
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reservation: update api and add some helpers
Move the list of shared fences to a struct, and return it in reservation_object_get_list(). Add reservation_object_get_excl to get the exclusive fence. Add reservation_object_reserve_shared(), which reserves space in the reservation_object for 1 more shared fence. reservation_object_add_shared_fence() and reservation_object_add_excl_fence() are used to assign a new fence to a reservation_object pointer, to complete a reservation. Changes since v1: - Add reservation_object_get_excl, reorder code a bit. Signed-off-by: Maarten Lankhorst <maarten.lankhorst@canonical.com> Acked-by: Sumit Semwal <sumit.semwal@linaro.org> Acked-by: Daniel Vetter <daniel@ffwll.ch> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/dma-buf/dma-buf.c')
-rw-r--r--drivers/dma-buf/dma-buf.c35
1 files changed, 24 insertions, 11 deletions
diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c
index 25e8c4165936..cb8379dfeed5 100644
--- a/drivers/dma-buf/dma-buf.c
+++ b/drivers/dma-buf/dma-buf.c
@@ -134,7 +134,10 @@ static unsigned int dma_buf_poll(struct file *file, poll_table *poll)
{
struct dma_buf *dmabuf;
struct reservation_object *resv;
+ struct reservation_object_list *fobj;
+ struct fence *fence_excl;
unsigned long events;
+ unsigned shared_count;
dmabuf = file->private_data;
if (!dmabuf || !dmabuf->resv)
@@ -150,12 +153,18 @@ static unsigned int dma_buf_poll(struct file *file, poll_table *poll)
ww_mutex_lock(&resv->lock, NULL);
- if (resv->fence_excl && (!(events & POLLOUT) ||
- resv->fence_shared_count == 0)) {
+ fobj = resv->fence;
+ if (!fobj)
+ goto out;
+
+ shared_count = fobj->shared_count;
+ fence_excl = resv->fence_excl;
+
+ if (fence_excl && (!(events & POLLOUT) || shared_count == 0)) {
struct dma_buf_poll_cb_t *dcb = &dmabuf->cb_excl;
unsigned long pevents = POLLIN;
- if (resv->fence_shared_count == 0)
+ if (shared_count == 0)
pevents |= POLLOUT;
spin_lock_irq(&dmabuf->poll.lock);
@@ -167,19 +176,20 @@ static unsigned int dma_buf_poll(struct file *file, poll_table *poll)
spin_unlock_irq(&dmabuf->poll.lock);
if (events & pevents) {
- if (!fence_add_callback(resv->fence_excl,
- &dcb->cb, dma_buf_poll_cb))
+ if (!fence_add_callback(fence_excl, &dcb->cb,
+ dma_buf_poll_cb)) {
events &= ~pevents;
- else
+ } else {
/*
* No callback queued, wake up any additional
* waiters.
*/
dma_buf_poll_cb(NULL, &dcb->cb);
+ }
}
}
- if ((events & POLLOUT) && resv->fence_shared_count > 0) {
+ if ((events & POLLOUT) && shared_count > 0) {
struct dma_buf_poll_cb_t *dcb = &dmabuf->cb_shared;
int i;
@@ -194,15 +204,18 @@ static unsigned int dma_buf_poll(struct file *file, poll_table *poll)
if (!(events & POLLOUT))
goto out;
- for (i = 0; i < resv->fence_shared_count; ++i)
- if (!fence_add_callback(resv->fence_shared[i],
- &dcb->cb, dma_buf_poll_cb)) {
+ for (i = 0; i < shared_count; ++i) {
+ struct fence *fence = fobj->shared[i];
+
+ if (!fence_add_callback(fence, &dcb->cb,
+ dma_buf_poll_cb)) {
events &= ~POLLOUT;
break;
}
+ }
/* No callback queued, wake up any additional waiters. */
- if (i == resv->fence_shared_count)
+ if (i == shared_count)
dma_buf_poll_cb(NULL, &dcb->cb);
}