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| author |   Rob Clark <robdclark@chromium.org> | 2023-08-23 14:54:55 -0700 |
|---|---|---|
| committer |   Dmitry Baryshkov <dmitry.baryshkov@linaro.org> | 2023-12-02 01:17:48 +0200 |
| commit | 63ee44540205d993854f143a5ab1d7d9e63ffcf1 (patch) | |
| tree | c08992f66daa7f8939b1c013056321000a868dfa /drivers/dma-buf | |
| parent | drm/syncobj: Add deadline support for syncobj waits (diff) | |
| download | wireguard-linux-63ee44540205d993854f143a5ab1d7d9e63ffcf1.tar.xz wireguard-linux-63ee44540205d993854f143a5ab1d7d9e63ffcf1.zip | |
dma-buf/sync_file: Add SET_DEADLINE ioctl
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
Diffstat (limited to 'drivers/dma-buf')
| -rw-r--r-- | drivers/dma-buf/dma-fence.c | 3 | ||||
| -rw-r--r-- | drivers/dma-buf/sync_file.c | 19 |
2 files changed, 21 insertions, 1 deletions
diff --git a/drivers/dma-buf/dma-fence.c b/drivers/dma-buf/dma-fence.c index 8aa8f8cb7071..e0fd99e61a2d 100644 --- a/drivers/dma-buf/dma-fence.c +++ b/drivers/dma-buf/dma-fence.c @@ -934,7 +934,8 @@ EXPORT_SYMBOL(dma_fence_wait_any_timeout); * the GPU's devfreq to reduce frequency, when in fact the opposite is what is * needed. * - * To this end, deadline hint(s) can be set on a &dma_fence via &dma_fence_set_deadline. + * To this end, deadline hint(s) can be set on a &dma_fence via &dma_fence_set_deadline + * (or indirectly via userspace facing ioctls like &sync_set_deadline). * The deadline hint provides a way for the waiting driver, or userspace, to * convey an appropriate sense of urgency to the signaling driver. * diff --git a/drivers/dma-buf/sync_file.c b/drivers/dma-buf/sync_file.c index 2e9a316c596a..d9b1c1b2a72b 100644 --- a/drivers/dma-buf/sync_file.c +++ b/drivers/dma-buf/sync_file.c @@ -347,6 +347,22 @@ out: return ret; } +static int sync_file_ioctl_set_deadline(struct sync_file *sync_file, + unsigned long arg) +{ + struct sync_set_deadline ts; + + if (copy_from_user(&ts, (void __user *)arg, sizeof(ts))) + return -EFAULT; + + if (ts.pad) + return -EINVAL; + + dma_fence_set_deadline(sync_file->fence, ns_to_ktime(ts.deadline_ns)); + + return 0; +} + static long sync_file_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { @@ -359,6 +375,9 @@ static long sync_file_ioctl(struct file *file, unsigned int cmd, case SYNC_IOC_FILE_INFO: return sync_file_ioctl_fence_info(sync_file, arg); + case SYNC_IOC_SET_DEADLINE: + return sync_file_ioctl_set_deadline(sync_file, arg); + default: return -ENOTTY; } |