diff options
| author | Danilo Krummrich <dakr@redhat.com> | 2023-11-10 03:16:33 +0300 |
|---|---|---|
| committer | Danilo Krummrich <dakr@redhat.com> | 2023-11-10 04:54:29 +0300 |
| commit | a78422e9dff366b3a46ae44caf6ec8ded9c9fc2f (patch) | |
| tree | 6fd1914c81a6743b425eff0c270eefc79e7da55d /drivers/gpu/drm/etnaviv | |
| parent | 36245bd02e88e68ac5955c2958c968879d7b75a9 (diff) | |
| download | linux-a78422e9dff366b3a46ae44caf6ec8ded9c9fc2f.tar.xz | |
drm/sched: implement dynamic job-flow control
Currently, job flow control is implemented simply by limiting the number
of jobs in flight. Therefore, a scheduler is initialized with a credit
limit that corresponds to the number of jobs which can be sent to the
hardware.
This implies that for each job, drivers need to account for the maximum
job size possible in order to not overflow the ring buffer.
However, there are drivers, such as Nouveau, where the job size has a
rather large range. For such drivers it can easily happen that job
submissions not even filling the ring by 1% can block subsequent
submissions, which, in the worst case, can lead to the ring run dry.
In order to overcome this issue, allow for tracking the actual job size
instead of the number of jobs. Therefore, add a field to track a job's
credit count, which represents the number of credits a job contributes
to the scheduler's credit limit.
Signed-off-by: Danilo Krummrich <dakr@redhat.com>
Reviewed-by: Luben Tuikov <ltuikov89@gmail.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20231110001638.71750-1-dakr@redhat.com
Diffstat (limited to 'drivers/gpu/drm/etnaviv')
| -rw-r--r-- | drivers/gpu/drm/etnaviv/etnaviv_gem_submit.c | 2 | ||||
| -rw-r--r-- | drivers/gpu/drm/etnaviv/etnaviv_gpu.c | 2 |
2 files changed, 2 insertions, 2 deletions
diff --git a/drivers/gpu/drm/etnaviv/etnaviv_gem_submit.c b/drivers/gpu/drm/etnaviv/etnaviv_gem_submit.c index 2416c526f9b0..3d0f8d182506 100644 --- a/drivers/gpu/drm/etnaviv/etnaviv_gem_submit.c +++ b/drivers/gpu/drm/etnaviv/etnaviv_gem_submit.c @@ -535,7 +535,7 @@ int etnaviv_ioctl_gem_submit(struct drm_device *dev, void *data, ret = drm_sched_job_init(&submit->sched_job, &ctx->sched_entity[args->pipe], - submit->ctx); + 1, submit->ctx); if (ret) goto err_submit_put; diff --git a/drivers/gpu/drm/etnaviv/etnaviv_gpu.c b/drivers/gpu/drm/etnaviv/etnaviv_gpu.c index 9276756e1397..5105d290e72e 100644 --- a/drivers/gpu/drm/etnaviv/etnaviv_gpu.c +++ b/drivers/gpu/drm/etnaviv/etnaviv_gpu.c @@ -1917,7 +1917,7 @@ static int etnaviv_gpu_rpm_suspend(struct device *dev) u32 idle, mask; /* If there are any jobs in the HW queue, we're not idle */ - if (atomic_read(&gpu->sched.hw_rq_count)) + if (atomic_read(&gpu->sched.credit_count)) return -EBUSY; /* Check whether the hardware (except FE and MC) is idle */ |