[PATCH v7 3/6] drm/sched: Convert the GPU scheduler to variable number of run-queues
Matthew Brost
matthew.brost at intel.com
Thu Oct 26 04:12:33 UTC 2023
From: Luben Tuikov <luben.tuikov at amd.com>
The GPU scheduler has now a variable number of run-queues, which are set up at
drm_sched_init() time. This way, each driver announces how many run-queues it
requires (supports) per each GPU scheduler it creates. Note, that run-queues
correspond to scheduler "priorities", thus if the number of run-queues is set
to 1 at drm_sched_init(), then that scheduler supports a single run-queue,
i.e. single "priority". If a driver further sets a single entity per
run-queue, then this creates a 1-to-1 correspondence between a scheduler and
a scheduled entity.
Cc: Lucas Stach <l.stach at pengutronix.de>
Cc: Russell King <linux+etnaviv at armlinux.org.uk>
Cc: Qiang Yu <yuq825 at gmail.com>
Cc: Rob Clark <robdclark at gmail.com>
Cc: Abhinav Kumar <quic_abhinavk at quicinc.com>
Cc: Dmitry Baryshkov <dmitry.baryshkov at linaro.org>
Cc: Danilo Krummrich <dakr at redhat.com>
Cc: Matthew Brost <matthew.brost at intel.com>
Cc: Boris Brezillon <boris.brezillon at collabora.com>
Cc: Alex Deucher <alexander.deucher at amd.com>
Cc: Christian König <christian.koenig at amd.com>
Cc: Emma Anholt <emma at anholt.net>
Cc: etnaviv at lists.freedesktop.org
Cc: lima at lists.freedesktop.org
Cc: linux-arm-msm at vger.kernel.org
Cc: freedreno at lists.freedesktop.org
Cc: nouveau at lists.freedesktop.org
Cc: dri-devel at lists.freedesktop.org
Signed-off-by: Luben Tuikov <luben.tuikov at amd.com>
Signed-off-by: Matthew Brost <matthew.brost at intel.com>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 1 +
drivers/gpu/drm/amd/amdgpu/amdgpu_job.c | 4 +-
drivers/gpu/drm/etnaviv/etnaviv_sched.c | 3 +-
drivers/gpu/drm/lima/lima_sched.c | 3 +-
drivers/gpu/drm/msm/msm_ringbuffer.c | 3 +-
drivers/gpu/drm/nouveau/nouveau_sched.c | 1 +
drivers/gpu/drm/panfrost/panfrost_job.c | 3 +-
drivers/gpu/drm/scheduler/sched_entity.c | 18 +++++-
drivers/gpu/drm/scheduler/sched_main.c | 75 ++++++++++++++++++----
drivers/gpu/drm/v3d/v3d_sched.c | 14 ++--
include/drm/gpu_scheduler.h | 9 ++-
11 files changed, 102 insertions(+), 32 deletions(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
index b54c4d771104..94d073bfbd13 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -2280,6 +2280,7 @@ static int amdgpu_device_init_schedulers(struct amdgpu_device *adev)
}
r = drm_sched_init(&ring->sched, &amdgpu_sched_ops, NULL,
+ DRM_SCHED_PRIORITY_COUNT,
ring->num_hw_submission, 0,
timeout, adev->reset_domain->wq,
ring->sched_score, ring->name,
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_job.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_job.c
index 78476bc75b4e..1f357198533f 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_job.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_job.c
@@ -325,8 +325,8 @@ void amdgpu_job_stop_all_jobs_on_sched(struct drm_gpu_scheduler *sched)
int i;
/* Signal all jobs not yet scheduled */
- for (i = DRM_SCHED_PRIORITY_COUNT - 1; i >= DRM_SCHED_PRIORITY_MIN; i--) {
- struct drm_sched_rq *rq = &sched->sched_rq[i];
+ for (i = sched->num_rqs - 1; i >= DRM_SCHED_PRIORITY_MIN; i--) {
+ struct drm_sched_rq *rq = sched->sched_rq[i];
spin_lock(&rq->lock);
list_for_each_entry(s_entity, &rq->entities, list) {
while ((s_job = to_drm_sched_job(spsc_queue_pop(&s_entity->job_queue)))) {
diff --git a/drivers/gpu/drm/etnaviv/etnaviv_sched.c b/drivers/gpu/drm/etnaviv/etnaviv_sched.c
index 618a804ddc34..396334984e4d 100644
--- a/drivers/gpu/drm/etnaviv/etnaviv_sched.c
+++ b/drivers/gpu/drm/etnaviv/etnaviv_sched.c
@@ -134,7 +134,8 @@ int etnaviv_sched_init(struct etnaviv_gpu *gpu)
{
int ret;
- ret = drm_sched_init(&gpu->sched, &etnaviv_sched_ops, NULL,
+ ret = drm_sched_init(&gpu->sched, &etnaviv_sched_ops,
+ DRM_SCHED_PRIORITY_COUNT, NULL,
etnaviv_hw_jobs_limit, etnaviv_job_hang_limit,
msecs_to_jiffies(500), NULL, NULL,
dev_name(gpu->dev), gpu->dev);
diff --git a/drivers/gpu/drm/lima/lima_sched.c b/drivers/gpu/drm/lima/lima_sched.c
index 8d858aed0e56..23a6276f1332 100644
--- a/drivers/gpu/drm/lima/lima_sched.c
+++ b/drivers/gpu/drm/lima/lima_sched.c
@@ -488,7 +488,8 @@ int lima_sched_pipe_init(struct lima_sched_pipe *pipe, const char *name)
INIT_WORK(&pipe->recover_work, lima_sched_recover_work);
- return drm_sched_init(&pipe->base, &lima_sched_ops, NULL, 1,
+ return drm_sched_init(&pipe->base, &lima_sched_ops,
+ DRM_SCHED_PRIORITY_COUNT, NULL, 1,
lima_job_hang_limit,
msecs_to_jiffies(timeout), NULL,
NULL, name, pipe->ldev->dev);
diff --git a/drivers/gpu/drm/msm/msm_ringbuffer.c b/drivers/gpu/drm/msm/msm_ringbuffer.c
index 1097f8e93d6b..935154979fc2 100644
--- a/drivers/gpu/drm/msm/msm_ringbuffer.c
+++ b/drivers/gpu/drm/msm/msm_ringbuffer.c
@@ -94,7 +94,8 @@ struct msm_ringbuffer *msm_ringbuffer_new(struct msm_gpu *gpu, int id,
/* currently managing hangcheck ourselves: */
sched_timeout = MAX_SCHEDULE_TIMEOUT;
- ret = drm_sched_init(&ring->sched, &msm_sched_ops, NULL,
+ ret = drm_sched_init(&ring->sched, &msm_sched_ops,
+ DRM_SCHED_PRIORITY_COUNT, NULL,
num_hw_submissions, 0, sched_timeout,
NULL, NULL, to_msm_bo(ring->bo)->name,
gpu->dev->dev);
diff --git a/drivers/gpu/drm/nouveau/nouveau_sched.c b/drivers/gpu/drm/nouveau/nouveau_sched.c
index 4c959dec42b3..c4ba56b1a6dd 100644
--- a/drivers/gpu/drm/nouveau/nouveau_sched.c
+++ b/drivers/gpu/drm/nouveau/nouveau_sched.c
@@ -436,6 +436,7 @@ int nouveau_sched_init(struct nouveau_drm *drm)
return -ENOMEM;
return drm_sched_init(sched, &nouveau_sched_ops, NULL,
+ DRM_SCHED_PRIORITY_COUNT,
NOUVEAU_SCHED_HW_SUBMISSIONS, 0, job_hang_limit,
NULL, NULL, "nouveau_sched", drm->dev->dev);
}
diff --git a/drivers/gpu/drm/panfrost/panfrost_job.c b/drivers/gpu/drm/panfrost/panfrost_job.c
index 934b7b930c76..205d62c04f96 100644
--- a/drivers/gpu/drm/panfrost/panfrost_job.c
+++ b/drivers/gpu/drm/panfrost/panfrost_job.c
@@ -852,7 +852,8 @@ int panfrost_job_init(struct panfrost_device *pfdev)
js->queue[j].fence_context = dma_fence_context_alloc(1);
ret = drm_sched_init(&js->queue[j].sched,
- &panfrost_sched_ops, NULL,
+ &panfrost_sched_ops,
+ DRM_SCHED_PRIORITY_COUNT, NULL,
nentries, 0,
msecs_to_jiffies(JOB_TIMEOUT_MS),
pfdev->reset.wq,
diff --git a/drivers/gpu/drm/scheduler/sched_entity.c b/drivers/gpu/drm/scheduler/sched_entity.c
index a42763e1429d..409e4256f6e7 100644
--- a/drivers/gpu/drm/scheduler/sched_entity.c
+++ b/drivers/gpu/drm/scheduler/sched_entity.c
@@ -75,8 +75,20 @@ int drm_sched_entity_init(struct drm_sched_entity *entity,
RCU_INIT_POINTER(entity->last_scheduled, NULL);
RB_CLEAR_NODE(&entity->rb_tree_node);
- if(num_sched_list)
- entity->rq = &sched_list[0]->sched_rq[entity->priority];
+ if (!sched_list[0]->sched_rq) {
+ /* Warn drivers not to do this and to fix their DRM
+ * calling order.
+ */
+ pr_warn("%s: called with uninitialized scheduler\n", __func__);
+ } else if (num_sched_list) {
+ /* The "priority" of an entity cannot exceed the number
+ * of run-queues of a scheduler.
+ */
+ if (entity->priority >= sched_list[0]->num_rqs)
+ entity->priority = max_t(u32, sched_list[0]->num_rqs,
+ DRM_SCHED_PRIORITY_MIN);
+ entity->rq = sched_list[0]->sched_rq[entity->priority];
+ }
init_completion(&entity->entity_idle);
@@ -533,7 +545,7 @@ void drm_sched_entity_select_rq(struct drm_sched_entity *entity)
spin_lock(&entity->rq_lock);
sched = drm_sched_pick_best(entity->sched_list, entity->num_sched_list);
- rq = sched ? &sched->sched_rq[entity->priority] : NULL;
+ rq = sched ? sched->sched_rq[entity->priority] : NULL;
if (rq != entity->rq) {
drm_sched_rq_remove_entity(entity->rq, entity);
entity->rq = rq;
diff --git a/drivers/gpu/drm/scheduler/sched_main.c b/drivers/gpu/drm/scheduler/sched_main.c
index 3a955b8acc4e..b22157e920d4 100644
--- a/drivers/gpu/drm/scheduler/sched_main.c
+++ b/drivers/gpu/drm/scheduler/sched_main.c
@@ -641,8 +641,14 @@ int drm_sched_job_init(struct drm_sched_job *job,
struct drm_sched_entity *entity,
void *owner)
{
- if (!entity->rq)
+ if (!entity->rq) {
+ /* This will most likely be followed by missing frames
+ * or worse--a blank screen--leave a trail in the
+ * logs, so this can be debugged easier.
+ */
+ drm_err(job->sched, "%s: entity has no rq!\n", __func__);
return -ENOENT;
+ }
job->entity = entity;
job->s_fence = drm_sched_fence_alloc(entity, owner);
@@ -680,7 +686,7 @@ void drm_sched_job_arm(struct drm_sched_job *job)
sched = entity->rq->sched;
job->sched = sched;
- job->s_priority = entity->rq - sched->sched_rq;
+ job->s_priority = entity->priority;
job->id = atomic64_inc_return(&sched->job_id_count);
drm_sched_fence_init(job->s_fence, job->entity);
@@ -897,10 +903,10 @@ drm_sched_select_entity(struct drm_gpu_scheduler *sched)
return NULL;
/* Kernel run queue has higher priority than normal run queue*/
- for (i = DRM_SCHED_PRIORITY_COUNT - 1; i >= DRM_SCHED_PRIORITY_MIN; i--) {
+ for (i = sched->num_rqs - 1; i >= DRM_SCHED_PRIORITY_MIN; i--) {
entity = drm_sched_policy == DRM_SCHED_POLICY_FIFO ?
- drm_sched_rq_select_entity_fifo(&sched->sched_rq[i]) :
- drm_sched_rq_select_entity_rr(&sched->sched_rq[i]);
+ drm_sched_rq_select_entity_fifo(sched->sched_rq[i]) :
+ drm_sched_rq_select_entity_rr(sched->sched_rq[i]);
if (entity)
break;
}
@@ -1065,6 +1071,7 @@ static void drm_sched_main(struct work_struct *w)
* @ops: backend operations for this scheduler
* @submit_wq: workqueue to use for submission. If NULL, an ordered wq is
* allocated and used
+ * @num_rqs: number of runqueues, one for each priority, up to DRM_SCHED_PRIORITY_COUNT
* @hw_submission: number of hw submissions that can be in flight
* @hang_limit: number of times to allow a job to hang before dropping it
* @timeout: timeout value in jiffies for the scheduler
@@ -1079,11 +1086,12 @@ static void drm_sched_main(struct work_struct *w)
int drm_sched_init(struct drm_gpu_scheduler *sched,
const struct drm_sched_backend_ops *ops,
struct workqueue_struct *submit_wq,
- unsigned hw_submission, unsigned hang_limit,
+ u32 num_rqs, unsigned hw_submission, unsigned hang_limit,
long timeout, struct workqueue_struct *timeout_wq,
atomic_t *score, const char *name, struct device *dev)
{
- int i;
+ int i, ret;
+
sched->ops = ops;
sched->hw_submission_limit = hw_submission;
sched->name = name;
@@ -1102,8 +1110,36 @@ int drm_sched_init(struct drm_gpu_scheduler *sched,
sched->hang_limit = hang_limit;
sched->score = score ? score : &sched->_score;
sched->dev = dev;
- for (i = DRM_SCHED_PRIORITY_MIN; i < DRM_SCHED_PRIORITY_COUNT; i++)
- drm_sched_rq_init(sched, &sched->sched_rq[i]);
+
+ if (num_rqs > DRM_SCHED_PRIORITY_COUNT) {
+ /* This is a gross violation--tell drivers what the problem is.
+ */
+ drm_err(sched, "%s: num_rqs cannot be greater than DRM_SCHED_PRIORITY_COUNT\n",
+ __func__);
+ return -EINVAL;
+ } else if (sched->sched_rq) {
+ /* Not an error, but warn anyway so drivers can
+ * fine-tune their DRM calling order, and return all
+ * is good.
+ */
+ drm_warn(sched, "%s: scheduler already initialized!\n", __func__);
+ return 0;
+ }
+
+ sched->sched_rq = kmalloc_array(num_rqs, sizeof(*sched->sched_rq),
+ GFP_KERNEL | __GFP_ZERO);
+ if (!sched->sched_rq) {
+ drm_err(sched, "%s: out of memory for sched_rq\n", __func__);
+ return -ENOMEM;
+ }
+ sched->num_rqs = num_rqs;
+ ret = -ENOMEM;
+ for (i = DRM_SCHED_PRIORITY_MIN; i < sched->num_rqs; i++) {
+ sched->sched_rq[i] = kzalloc(sizeof(*sched->sched_rq[i]), GFP_KERNEL);
+ if (!sched->sched_rq[i])
+ goto Out_unroll;
+ drm_sched_rq_init(sched, sched->sched_rq[i]);
+ }
init_waitqueue_head(&sched->job_scheduled);
INIT_LIST_HEAD(&sched->pending_list);
@@ -1117,6 +1153,14 @@ int drm_sched_init(struct drm_gpu_scheduler *sched,
sched->ready = true;
return 0;
+
+Out_unroll:
+ for (--i ; i >= DRM_SCHED_PRIORITY_MIN; i--)
+ kfree(sched->sched_rq[i]);
+ kfree(sched->sched_rq);
+ sched->sched_rq = NULL;
+ drm_err(sched, "%s: Failed to setup GPU scheduler--out of memory\n", __func__);
+ return ret;
}
EXPORT_SYMBOL(drm_sched_init);
@@ -1134,8 +1178,8 @@ void drm_sched_fini(struct drm_gpu_scheduler *sched)
drm_sched_wqueue_stop(sched);
- for (i = DRM_SCHED_PRIORITY_COUNT - 1; i >= DRM_SCHED_PRIORITY_MIN; i--) {
- struct drm_sched_rq *rq = &sched->sched_rq[i];
+ for (i = sched->num_rqs - 1; i >= DRM_SCHED_PRIORITY_MIN; i--) {
+ struct drm_sched_rq *rq = sched->sched_rq[i];
spin_lock(&rq->lock);
list_for_each_entry(s_entity, &rq->entities, list)
@@ -1146,7 +1190,7 @@ void drm_sched_fini(struct drm_gpu_scheduler *sched)
*/
s_entity->stopped = true;
spin_unlock(&rq->lock);
-
+ kfree(sched->sched_rq[i]);
}
/* Wakeup everyone stuck in drm_sched_entity_flush for this scheduler */
@@ -1158,6 +1202,8 @@ void drm_sched_fini(struct drm_gpu_scheduler *sched)
if (sched->own_submit_wq)
destroy_workqueue(sched->submit_wq);
sched->ready = false;
+ kfree(sched->sched_rq);
+ sched->sched_rq = NULL;
}
EXPORT_SYMBOL(drm_sched_fini);
@@ -1184,9 +1230,10 @@ void drm_sched_increase_karma(struct drm_sched_job *bad)
if (bad->s_priority != DRM_SCHED_PRIORITY_KERNEL) {
atomic_inc(&bad->karma);
- for (i = DRM_SCHED_PRIORITY_MIN; i < DRM_SCHED_PRIORITY_KERNEL;
+ for (i = DRM_SCHED_PRIORITY_MIN;
+ i < min_t(typeof(sched->num_rqs), sched->num_rqs, DRM_SCHED_PRIORITY_KERNEL);
i++) {
- struct drm_sched_rq *rq = &sched->sched_rq[i];
+ struct drm_sched_rq *rq = sched->sched_rq[i];
spin_lock(&rq->lock);
list_for_each_entry_safe(entity, tmp, &rq->entities, list) {
diff --git a/drivers/gpu/drm/v3d/v3d_sched.c b/drivers/gpu/drm/v3d/v3d_sched.c
index 38e092ea41e6..175c3e30647a 100644
--- a/drivers/gpu/drm/v3d/v3d_sched.c
+++ b/drivers/gpu/drm/v3d/v3d_sched.c
@@ -388,7 +388,7 @@ v3d_sched_init(struct v3d_dev *v3d)
int ret;
ret = drm_sched_init(&v3d->queue[V3D_BIN].sched,
- &v3d_bin_sched_ops, NULL,
+ &v3d_bin_sched_ops, DRM_SCHED_PRIORITY_COUNT, NULL,
hw_jobs_limit, job_hang_limit,
msecs_to_jiffies(hang_limit_ms), NULL,
NULL, "v3d_bin", v3d->drm.dev);
@@ -396,15 +396,15 @@ v3d_sched_init(struct v3d_dev *v3d)
return ret;
ret = drm_sched_init(&v3d->queue[V3D_RENDER].sched,
- &v3d_render_sched_ops, NULL,
- hw_jobs_limit, job_hang_limit,
+ &v3d_render_sched_ops, DRM_SCHED_PRIORITY_COUNT,
+ NULL, hw_jobs_limit, job_hang_limit,
msecs_to_jiffies(hang_limit_ms), NULL,
NULL, "v3d_render", v3d->drm.dev);
if (ret)
goto fail;
ret = drm_sched_init(&v3d->queue[V3D_TFU].sched,
- &v3d_tfu_sched_ops, NULL,
+ &v3d_tfu_sched_ops, DRM_SCHED_PRIORITY_COUNT, NULL,
hw_jobs_limit, job_hang_limit,
msecs_to_jiffies(hang_limit_ms), NULL,
NULL, "v3d_tfu", v3d->drm.dev);
@@ -413,7 +413,8 @@ v3d_sched_init(struct v3d_dev *v3d)
if (v3d_has_csd(v3d)) {
ret = drm_sched_init(&v3d->queue[V3D_CSD].sched,
- &v3d_csd_sched_ops, NULL,
+ &v3d_csd_sched_ops,
+ DRM_SCHED_PRIORITY_COUNT, NULL,
hw_jobs_limit, job_hang_limit,
msecs_to_jiffies(hang_limit_ms), NULL,
NULL, "v3d_csd", v3d->drm.dev);
@@ -421,7 +422,8 @@ v3d_sched_init(struct v3d_dev *v3d)
goto fail;
ret = drm_sched_init(&v3d->queue[V3D_CACHE_CLEAN].sched,
- &v3d_cache_clean_sched_ops, NULL,
+ &v3d_cache_clean_sched_ops,
+ DRM_SCHED_PRIORITY_COUNT, NULL,
hw_jobs_limit, job_hang_limit,
msecs_to_jiffies(hang_limit_ms), NULL,
NULL, "v3d_cache_clean", v3d->drm.dev);
diff --git a/include/drm/gpu_scheduler.h b/include/drm/gpu_scheduler.h
index 211bd3cdabdc..1d52b8bbb06c 100644
--- a/include/drm/gpu_scheduler.h
+++ b/include/drm/gpu_scheduler.h
@@ -472,7 +472,9 @@ struct drm_sched_backend_ops {
* @hw_submission_limit: the max size of the hardware queue.
* @timeout: the time after which a job is removed from the scheduler.
* @name: name of the ring for which this scheduler is being used.
- * @sched_rq: priority wise array of run queues.
+ * @num_rqs: Number of run-queues. This is at most DRM_SCHED_PRIORITY_COUNT,
+ * as there's usually one run-queue per priority, but could be less.
+ * @sched_rq: An allocated array of run-queues of size @num_rqs;
* @job_scheduled: once @drm_sched_entity_do_release is called the scheduler
* waits on this wait queue until all the scheduled jobs are
* finished.
@@ -502,7 +504,8 @@ struct drm_gpu_scheduler {
uint32_t hw_submission_limit;
long timeout;
const char *name;
- struct drm_sched_rq sched_rq[DRM_SCHED_PRIORITY_COUNT];
+ u32 num_rqs;
+ struct drm_sched_rq **sched_rq;
wait_queue_head_t job_scheduled;
atomic_t hw_rq_count;
atomic64_t job_id_count;
@@ -525,7 +528,7 @@ struct drm_gpu_scheduler {
int drm_sched_init(struct drm_gpu_scheduler *sched,
const struct drm_sched_backend_ops *ops,
struct workqueue_struct *submit_wq,
- uint32_t hw_submission, unsigned hang_limit,
+ u32 num_rqs, uint32_t hw_submission, unsigned hang_limit,
long timeout, struct workqueue_struct *timeout_wq,
atomic_t *score, const char *name, struct device *dev);
--
2.34.1
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