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path: root/drivers/dma-buf/sync_file.c
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Diffstat (limited to 'drivers/dma-buf/sync_file.c')
-rw-r--r--drivers/dma-buf/sync_file.c81
1 files changed, 47 insertions, 34 deletions
diff --git a/drivers/dma-buf/sync_file.c b/drivers/dma-buf/sync_file.c
index 6d802f2d2881..d7e219d2669d 100644
--- a/drivers/dma-buf/sync_file.c
+++ b/drivers/dma-buf/sync_file.c
@@ -41,8 +41,6 @@ static struct sync_file *sync_file_alloc(void)
if (IS_ERR(sync_file->file))
goto err;
- kref_init(&sync_file->kref);
-
init_waitqueue_head(&sync_file->wq);
INIT_LIST_HEAD(&sync_file->cb.node);
@@ -67,9 +65,10 @@ static void fence_check_cb_func(struct dma_fence *f, struct dma_fence_cb *cb)
* sync_file_create() - creates a sync file
* @fence: fence to add to the sync_fence
*
- * Creates a sync_file containg @fence. Once this is called, the sync_file
- * takes ownership of @fence. The sync_file can be released with
- * fput(sync_file->file). Returns the sync_file or NULL in case of error.
+ * Creates a sync_file containg @fence. This function acquires and additional
+ * reference of @fence for the newly-created &sync_file, if it succeeds. The
+ * sync_file can be released with fput(sync_file->file). Returns the
+ * sync_file or NULL in case of error.
*/
struct sync_file *sync_file_create(struct dma_fence *fence)
{
@@ -81,22 +80,10 @@ struct sync_file *sync_file_create(struct dma_fence *fence)
sync_file->fence = dma_fence_get(fence);
- snprintf(sync_file->name, sizeof(sync_file->name), "%s-%s%llu-%d",
- fence->ops->get_driver_name(fence),
- fence->ops->get_timeline_name(fence), fence->context,
- fence->seqno);
-
return sync_file;
}
EXPORT_SYMBOL(sync_file_create);
-/**
- * sync_file_fdget() - get a sync_file from an fd
- * @fd: fd referencing a fence
- *
- * Ensures @fd references a valid sync_file, increments the refcount of the
- * backing file. Returns the sync_file or NULL in case of error.
- */
static struct sync_file *sync_file_fdget(int fd)
{
struct file *file = fget(fd);
@@ -137,6 +124,36 @@ struct dma_fence *sync_file_get_fence(int fd)
}
EXPORT_SYMBOL(sync_file_get_fence);
+/**
+ * sync_file_get_name - get the name of the sync_file
+ * @sync_file: sync_file to get the fence from
+ * @buf: destination buffer to copy sync_file name into
+ * @len: available size of destination buffer.
+ *
+ * Each sync_file may have a name assigned either by the user (when merging
+ * sync_files together) or created from the fence it contains. In the latter
+ * case construction of the name is deferred until use, and so requires
+ * sync_file_get_name().
+ *
+ * Returns: a string representing the name.
+ */
+char *sync_file_get_name(struct sync_file *sync_file, char *buf, int len)
+{
+ if (sync_file->user_name[0]) {
+ strlcpy(buf, sync_file->user_name, len);
+ } else {
+ struct dma_fence *fence = sync_file->fence;
+
+ snprintf(buf, len, "%s-%s%llu-%d",
+ fence->ops->get_driver_name(fence),
+ fence->ops->get_timeline_name(fence),
+ fence->context,
+ fence->seqno);
+ }
+
+ return buf;
+}
+
static int sync_file_set_fence(struct sync_file *sync_file,
struct dma_fence **fences, int num_fences)
{
@@ -274,7 +291,7 @@ static struct sync_file *sync_file_merge(const char *name, struct sync_file *a,
goto err;
}
- strlcpy(sync_file->name, name, sizeof(sync_file->name));
+ strlcpy(sync_file->user_name, name, sizeof(sync_file->user_name));
return sync_file;
err:
@@ -283,22 +300,15 @@ err:
}
-static void sync_file_free(struct kref *kref)
+static int sync_file_release(struct inode *inode, struct file *file)
{
- struct sync_file *sync_file = container_of(kref, struct sync_file,
- kref);
+ struct sync_file *sync_file = file->private_data;
if (test_bit(POLL_ENABLED, &sync_file->fence->flags))
dma_fence_remove_callback(sync_file->fence, &sync_file->cb);
dma_fence_put(sync_file->fence);
kfree(sync_file);
-}
-static int sync_file_release(struct inode *inode, struct file *file)
-{
- struct sync_file *sync_file = file->private_data;
-
- kref_put(&sync_file->kref, sync_file_free);
return 0;
}
@@ -379,11 +389,15 @@ static void sync_fill_fence_info(struct dma_fence *fence,
sizeof(info->obj_name));
strlcpy(info->driver_name, fence->ops->get_driver_name(fence),
sizeof(info->driver_name));
- if (dma_fence_is_signaled(fence))
- info->status = fence->status >= 0 ? 1 : fence->status;
- else
- info->status = 0;
- info->timestamp_ns = ktime_to_ns(fence->timestamp);
+
+ info->status = dma_fence_get_status(fence);
+ while (test_bit(DMA_FENCE_FLAG_SIGNALED_BIT, &fence->flags) &&
+ !test_bit(DMA_FENCE_FLAG_TIMESTAMP_BIT, &fence->flags))
+ cpu_relax();
+ info->timestamp_ns =
+ test_bit(DMA_FENCE_FLAG_TIMESTAMP_BIT, &fence->flags) ?
+ ktime_to_ns(fence->timestamp) :
+ ktime_set(0, 0);
}
static long sync_file_ioctl_fence_info(struct sync_file *sync_file,
@@ -430,7 +444,7 @@ static long sync_file_ioctl_fence_info(struct sync_file *sync_file,
}
no_fences:
- strlcpy(info.name, sync_file->name, sizeof(info.name));
+ sync_file_get_name(sync_file, info.name, sizeof(info.name));
info.status = dma_fence_is_signaled(sync_file->fence);
info.num_fences = num_fences;
@@ -468,4 +482,3 @@ static const struct file_operations sync_file_fops = {
.unlocked_ioctl = sync_file_ioctl,
.compat_ioctl = sync_file_ioctl,
};
-