From: Gustavo Padovan <gustavo.padovan@xxxxxxxxxxxxxxx> Creates a function that given an sync file descriptor returns a fence_collection containing all fences in the sync_file. If there is only one fence in the sync_file this fence itself is returned, however if there is more than one, a fence_collection fence is returned. v2: Comments by Daniel Vetter - Adapt to new version of fence_collection_init() - Hold a reference for the fence we return v3: - Adapt to use fput() directly - rename to sync_file_get_fence() as we always return one fence v4: Adapt to use fence_array Signed-off-by: Gustavo Padovan <gustavo.padovan@xxxxxxxxxxxxxxx> --- drivers/dma-buf/sync_file.c | 61 +++++++++++++++++++++++++++++++++++++++++++++ include/linux/sync_file.h | 4 ++- 2 files changed, 64 insertions(+), 1 deletion(-) diff --git a/drivers/dma-buf/sync_file.c b/drivers/dma-buf/sync_file.c index 59f3445..daaf411 100644 --- a/drivers/dma-buf/sync_file.c +++ b/drivers/dma-buf/sync_file.c @@ -23,6 +23,7 @@ #include <linux/slab.h> #include <linux/uaccess.h> #include <linux/anon_inodes.h> +#include <linux/fence-array.h> #include <linux/sync_file.h> #include <uapi/linux/sync_file.h> @@ -122,6 +123,63 @@ err: return NULL; } +/** + * sync_file_get_fence - get the fence related to the sync_file fd + * @fd: sync_file fd to get the fence from + * + * Ensures @fd references a valid sync_file and returns a fence that + * represents all fence in the sync_file. + * + * If there is only one fence in the sync_file, this fence is returned. + * If there is more than one, a fence_array containing all fences + * is created and its base fence object is returned. + * On both cases a reference to the returned fence is held. On error + * NULL is returned. + */ +struct fence *sync_file_get_fence(int fd) +{ + struct sync_file *sync_file; + struct fence_array *fence_array; + struct fence **fences; + int i; + + sync_file = sync_file_fdget(fd); + if (!sync_file) + return NULL; + + if (sync_file->num_fences == 1) { + struct fence *fence = sync_file->cbs[0].fence; + + fence_get(fence); + fput(sync_file->file); + return fence; + } + + fences = kcalloc(sync_file->num_fences, sizeof(**fences), GFP_KERNEL); + if (!fences) { + fput(sync_file->file); + return NULL; + } + + for (i = 0 ; i < sync_file->num_fences ; i++) + fences[i] = sync_file->cbs[i].fence; + + fence_array = fence_array_create(sync_file->num_fences, fences, + fence_context_alloc(1), 1, false); + if (!fence_array) { + kfree(fences); + fput(sync_file->file); + return NULL; + } + + sync_file->fence_array = fence_array; + fence_get(&fence_array->base); + fput(sync_file->file); + + return &fence_array->base; +} +EXPORT_SYMBOL(sync_file_get_fence); + static void sync_file_add_pt(struct sync_file *sync_file, int *i, struct fence *fence) { @@ -209,6 +267,9 @@ static void sync_file_free(struct kref *kref) kref); int i; + if (sync_file->fence_array) + fence_put(&sync_file->fence_array->base); + for (i = 0; i < sync_file->num_fences; ++i) fence_put(sync_file->cbs[i].fence); diff --git a/include/linux/sync_file.h b/include/linux/sync_file.h index c6ffe8b..33cb3d6 100644 --- a/include/linux/sync_file.h +++ b/include/linux/sync_file.h @@ -35,6 +35,7 @@ struct sync_file_cb { * @num_fences: number of sync_pts in the fence * @wq: wait queue for fence signaling * @status: 0: signaled, >0:active, <0: error + * @fence_array: array with the fences in the sync_file * @cbs: sync_pts callback information */ struct sync_file { @@ -49,9 +50,10 @@ struct sync_file { wait_queue_head_t wq; atomic_t status; + struct fence_array *fence_array; struct sync_file_cb cbs[]; }; struct sync_file *sync_file_create(struct fence *fence); - +struct fence *sync_file_get_fence(int fd); #endif /* _LINUX_SYNC_H */ -- 2.5.5 _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel