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63ee445402
The initial purpose is for igt tests, but this would also be useful for compositors that wait until close to vblank deadline to make decisions about which frame to show. The igt tests can be found at: https://gitlab.freedesktop.org/robclark/igt-gpu-tools/-/commits/fence-deadline v2: Clarify the timebase, add link to igt tests v3: Use u64 value in ns to express deadline. v4: More doc Signed-off-by: Rob Clark <robdclark@chromium.org> Acked-by: Pekka Paalanen <pekka.paalanen@collabora.com> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org> Link: https://patchwork.freedesktop.org/patch/msgid/20230823215458.203366-3-robdclark@gmail.com
113 lines
3.4 KiB
C
113 lines
3.4 KiB
C
/* SPDX-License-Identifier: GPL-1.0+ WITH Linux-syscall-note */
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/*
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* Copyright (C) 2012 Google, Inc.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#ifndef _UAPI_LINUX_SYNC_H
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#define _UAPI_LINUX_SYNC_H
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#include <linux/ioctl.h>
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#include <linux/types.h>
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/**
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* struct sync_merge_data - SYNC_IOC_MERGE: merge two fences
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* @name: name of new fence
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* @fd2: file descriptor of second fence
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* @fence: returns the fd of the new fence to userspace
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* @flags: merge_data flags
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* @pad: padding for 64-bit alignment, should always be zero
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*
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* Creates a new fence containing copies of the sync_pts in both
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* the calling fd and sync_merge_data.fd2. Returns the new fence's
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* fd in sync_merge_data.fence
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*/
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struct sync_merge_data {
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char name[32];
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__s32 fd2;
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__s32 fence;
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__u32 flags;
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__u32 pad;
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};
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/**
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* struct sync_fence_info - detailed fence information
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* @obj_name: name of parent sync_timeline
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* @driver_name: name of driver implementing the parent
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* @status: status of the fence 0:active 1:signaled <0:error
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* @flags: fence_info flags
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* @timestamp_ns: timestamp of status change in nanoseconds
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*/
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struct sync_fence_info {
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char obj_name[32];
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char driver_name[32];
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__s32 status;
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__u32 flags;
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__u64 timestamp_ns;
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};
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/**
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* struct sync_file_info - SYNC_IOC_FILE_INFO: get detailed information on a sync_file
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* @name: name of fence
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* @status: status of fence. 1: signaled 0:active <0:error
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* @flags: sync_file_info flags
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* @num_fences: number of fences in the sync_file
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* @pad: padding for 64-bit alignment, should always be zero
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* @sync_fence_info: pointer to array of struct &sync_fence_info with all
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* fences in the sync_file
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*
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* Takes a struct sync_file_info. If num_fences is 0, the field is updated
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* with the actual number of fences. If num_fences is > 0, the system will
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* use the pointer provided on sync_fence_info to return up to num_fences of
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* struct sync_fence_info, with detailed fence information.
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*/
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struct sync_file_info {
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char name[32];
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__s32 status;
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__u32 flags;
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__u32 num_fences;
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__u32 pad;
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__u64 sync_fence_info;
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};
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/**
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* struct sync_set_deadline - SYNC_IOC_SET_DEADLINE - set a deadline hint on a fence
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* @deadline_ns: absolute time of the deadline
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* @pad: must be zero
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*
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* Allows userspace to set a deadline on a fence, see &dma_fence_set_deadline
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*
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* The timebase for the deadline is CLOCK_MONOTONIC (same as vblank). For
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* example
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*
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* clock_gettime(CLOCK_MONOTONIC, &t);
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* deadline_ns = (t.tv_sec * 1000000000L) + t.tv_nsec + ns_until_deadline
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*/
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struct sync_set_deadline {
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__u64 deadline_ns;
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/* Not strictly needed for alignment but gives some possibility
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* for future extension:
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*/
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__u64 pad;
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};
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#define SYNC_IOC_MAGIC '>'
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/*
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* Opcodes 0, 1 and 2 were burned during a API change to avoid users of the
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* old API to get weird errors when trying to handling sync_files. The API
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* change happened during the de-stage of the Sync Framework when there was
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* no upstream users available.
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*/
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#define SYNC_IOC_MERGE _IOWR(SYNC_IOC_MAGIC, 3, struct sync_merge_data)
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#define SYNC_IOC_FILE_INFO _IOWR(SYNC_IOC_MAGIC, 4, struct sync_file_info)
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#define SYNC_IOC_SET_DEADLINE _IOW(SYNC_IOC_MAGIC, 5, struct sync_set_deadline)
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#endif /* _UAPI_LINUX_SYNC_H */
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