From: Gustavo Padovan gustavo.padovan@collabora.co.uk
Creates a function that given an sync file descriptor returns a fence_collection containing all fences in the sync_file.
Signed-off-by: Gustavo Padovan gustavo.padovan@collabora.co.uk --- drivers/dma-buf/sync_file.c | 36 ++++++++++++++++++++++++++++++++++++ include/linux/sync_file.h | 8 ++++++++ 2 files changed, 44 insertions(+)
diff --git a/drivers/dma-buf/sync_file.c b/drivers/dma-buf/sync_file.c index b67876b..16a3ef7 100644 --- a/drivers/dma-buf/sync_file.c +++ b/drivers/dma-buf/sync_file.c @@ -122,6 +122,42 @@ void sync_file_install(struct sync_file *sync_file, int fd) } EXPORT_SYMBOL(sync_file_install);
+static void sync_file_fence_collection_put(void *data) +{ + struct sync_file *sync_file = data; + + sync_file_put(sync_file); +} + +struct fence_collection *sync_file_fences_get(int fd) +{ + struct fence_collection *collection; + struct sync_file *sync_file; + int i; + + sync_file = sync_file_fdget(fd); + if (!sync_file) + return NULL; + + collection = kzalloc(offsetof(struct fence_collection, + fences[sync_file->num_fences]), + GFP_KERNEL); + if (!collection) + return NULL; + + collection->num_fences = sync_file->num_fences; + collection->user_data = sync_file; + collection->func = sync_file_fence_collection_put; + + for (i = 0; i < sync_file->num_fences; ++i) { + collection->fences[i] = sync_file->cbs[i].fence; + fence_get(collection->fences[i]); + } + + return collection; +} +EXPORT_SYMBOL(sync_file_fences_get); + static void sync_file_add_pt(struct sync_file *sync_file, int *i, struct fence *fence) { diff --git a/include/linux/sync_file.h b/include/linux/sync_file.h index 7b7a89d..1b9386a 100644 --- a/include/linux/sync_file.h +++ b/include/linux/sync_file.h @@ -103,4 +103,12 @@ void sync_file_put(struct sync_file *sync_file); */ void sync_file_install(struct sync_file *sync_file, int fd);
+/** + * sync_file_fences_get - get the fence collection related to the fd + * @fd: file descriptor to look for a fence collection + * + * Ensures @fd references a valid sync_file, increments the refcount of the + * backing file. Returns the fence_collection or NULL in case of error. + */ +struct fence_collection *sync_file_fences_get(int fd); #endif /* _LINUX_SYNC_H */