This series adds a deadline hint to fences, so realtime deadlines such as vblank can be communicated to the fence signaller for power/ frequency management decisions. This is partially inspired by a trick i915 does, but implemented via dma-fence for a couple of reasons: 1) To continue to be able to use the atomic helpers 2) To support cases where display and gpu are different drivers See https://patchwork.freedesktop.org/series/93035/ This does not yet add any UAPI, although this will be needed in a number of cases: 1) Workloads "ping-ponging" between CPU and GPU, where we don't want the GPU freq governor to interpret time stalled waiting for GPU as "idle" time 2) Cases where the compositor is waiting for fences to be signaled before issuing the atomic ioctl, for example to maintain 60fps cursor updates even when the GPU is not able to maintain that framerate.
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| @@ -16,12 +16,16 @@ · 15 unmodified lines | ||
| 16 | 16 | #include <linux/types.h> |
| 17 | 17 | |
| 18 | 18 | /** |
| 19 | − * struct sync_merge_data - data passed to merge ioctl | |
| 19 | + * struct sync_merge_data - SYNC_IOC_MERGE: merge two fences | |
| 20 | 20 | * @name: name of new fence |
| 21 | 21 | * @fd2: file descriptor of second fence |
| 22 | 22 | * @fence: returns the fd of the new fence to userspace |
| 23 | 23 | * @flags: merge_data flags |
| 24 | 24 | * @pad: padding for 64-bit alignment, should always be zero |
| 25 | + * | |
| 26 | + * Creates a new fence containing copies of the sync_pts in both | |
| 27 | + * the calling fd and sync_merge_data.fd2. Returns the new fence's | |
| 28 | + * fd in sync_merge_data.fence | |
| 25 | 29 | */ |
| 26 | 30 | struct sync_merge_data { |
| 27 | 31 | char name[32]; |
| @@ -34,8 +38,8 @@ struct sync_merge_data { · 6 unmodified lines | ||
| 34 | 38 | /** |
| 35 | 39 | * struct sync_fence_info - detailed fence information |
| 36 | 40 | * @obj_name: name of parent sync_timeline |
| 37 | −* @driver_name: name of driver implementing the parent | |
| 38 | −* @status: status of the fence 0:active 1:signaled <0:error | |
| 41 | + * @driver_name: name of driver implementing the parent | |
| 42 | + * @status: status of the fence 0:active 1:signaled <0:error | |
| 39 | 43 | * @flags: fence_info flags |
| 40 | 44 | * @timestamp_ns: timestamp of status change in nanoseconds |
| 41 | 45 | */ |
| @@ -48,14 +52,19 @@ struct sync_fence_info { · 6 unmodified lines | ||
| 48 | 52 | }; |
| 49 | 53 | |
| 50 | 54 | /** |
| 51 | − * struct sync_file_info - data returned from fence info ioctl | |
| 55 | + * struct sync_file_info - SYNC_IOC_FILE_INFO: get detailed information on a sync_file | |
| 52 | 56 | * @name: name of fence |
| 53 | 57 | * @status: status of fence. 1: signaled 0:active <0:error |
| 54 | 58 | * @flags: sync_file_info flags |
| 55 | 59 | * @num_fences number of fences in the sync_file |
| 56 | 60 | * @pad: padding for 64-bit alignment, should always be zero |
| 57 | − * @sync_fence_info: pointer to array of structs sync_fence_info with all | |
| 61 | + * @sync_fence_info: pointer to array of struct &sync_fence_info with all | |
| 58 | 62 | * fences in the sync_file |
| 63 | + * | |
| 64 | + * Takes a struct sync_file_info. If num_fences is 0, the field is updated | |
| 65 | + * with the actual number of fences. If num_fences is > 0, the system will | |
| 66 | + * use the pointer provided on sync_fence_info to return up to num_fences of | |
| 67 | + * struct sync_fence_info, with detailed fence information. | |
| 59 | 68 | */ |
| 60 | 69 | struct sync_file_info { |
| 61 | 70 | char name[32]; |
| @@ -69,30 +78,14 @@ struct sync_file_info { · 7 unmodified lines | ||
| 69 | 78 | |
| 70 | 79 | #define SYNC_IOC_MAGIC '>' |
| 71 | 80 | |
| 72 | −/** | |
| 81 | +/* | |
| 73 | 82 | * Opcodes 0, 1 and 2 were burned during a API change to avoid users of the |
| 74 | 83 | * old API to get weird errors when trying to handling sync_files. The API |
| 75 | 84 | * change happened during the de-stage of the Sync Framework when there was |
| 76 | 85 | * no upstream users available. |
| 77 | 86 | */ |
| 78 | 87 | |
| 79 | −/** | |
| 80 | − * DOC: SYNC_IOC_MERGE - merge two fences | |
| 81 | − * | |
| 82 | − * Takes a struct sync_merge_data. Creates a new fence containing copies of | |
| 83 | − * the sync_pts in both the calling fd and sync_merge_data.fd2. Returns the | |
| 84 | − * new fence's fd in sync_merge_data.fence | |
| 85 | − */ | |
| 86 | 88 | #define SYNC_IOC_MERGE _IOWR(SYNC_IOC_MAGIC, 3, struct sync_merge_data) |
| 87 | − | |
| 88 | −/** | |
| 89 | − * DOC: SYNC_IOC_FILE_INFO - get detailed information on a sync_file | |
| 90 | − * | |
| 91 | − * Takes a struct sync_file_info. If num_fences is 0, the field is updated | |
| 92 | − * with the actual number of fences. If num_fences is > 0, the system will | |
| 93 | − * use the pointer provided on sync_fence_info to return up to num_fences of | |
| 94 | − * struct sync_fence_info, with detailed fence information. | |
| 95 | − */ | |
| 96 | 89 | #define SYNC_IOC_FILE_INFO _IOWR(SYNC_IOC_MAGIC, 4, struct sync_file_info) |
| 97 | 90 | |
| 98 | 91 | #endif /* _UAPI_LINUX_SYNC_H */ |