Better match the naming of the other components.
Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Huang Rui <ray.huang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
# OTHER DEALINGS IN THE SOFTWARE.
#
#
-gpu-sched-y := gpu_scheduler.o sched_fence.o sched_entity.o
+gpu-sched-y := sched_main.o sched_fence.o sched_entity.o
obj-$(CONFIG_DRM_SCHED) += gpu-sched.o
+++ /dev/null
-/*
- * Copyright 2015 Advanced Micro Devices, Inc.
- *
- * Permission is hereby granted, free of charge, to any person obtaining a
- * copy of this software and associated documentation files (the "Software"),
- * to deal in the Software without restriction, including without limitation
- * the rights to use, copy, modify, merge, publish, distribute, sublicense,
- * and/or sell copies of the Software, and to permit persons to whom the
- * Software is furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
- * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
- * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
- * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
- * OTHER DEALINGS IN THE SOFTWARE.
- *
- */
-
-/**
- * DOC: Overview
- *
- * The GPU scheduler provides entities which allow userspace to push jobs
- * into software queues which are then scheduled on a hardware run queue.
- * The software queues have a priority among them. The scheduler selects the entities
- * from the run queue using a FIFO. The scheduler provides dependency handling
- * features among jobs. The driver is supposed to provide callback functions for
- * backend operations to the scheduler like submitting a job to hardware run queue,
- * returning the dependencies of a job etc.
- *
- * The organisation of the scheduler is the following:
- *
- * 1. Each hw run queue has one scheduler
- * 2. Each scheduler has multiple run queues with different priorities
- * (e.g., HIGH_HW,HIGH_SW, KERNEL, NORMAL)
- * 3. Each scheduler run queue has a queue of entities to schedule
- * 4. Entities themselves maintain a queue of jobs that will be scheduled on
- * the hardware.
- *
- * The jobs in a entity are always scheduled in the order that they were pushed.
- */
-
-#include <linux/kthread.h>
-#include <linux/wait.h>
-#include <linux/sched.h>
-#include <uapi/linux/sched/types.h>
-#include <drm/drmP.h>
-#include <drm/gpu_scheduler.h>
-#include <drm/spsc_queue.h>
-
-#define CREATE_TRACE_POINTS
-#include "gpu_scheduler_trace.h"
-
-#define to_drm_sched_job(sched_job) \
- container_of((sched_job), struct drm_sched_job, queue_node)
-
-static void drm_sched_process_job(struct dma_fence *f, struct dma_fence_cb *cb);
-
-/**
- * drm_sched_rq_init - initialize a given run queue struct
- *
- * @rq: scheduler run queue
- *
- * Initializes a scheduler runqueue.
- */
-static void drm_sched_rq_init(struct drm_gpu_scheduler *sched,
- struct drm_sched_rq *rq)
-{
- spin_lock_init(&rq->lock);
- INIT_LIST_HEAD(&rq->entities);
- rq->current_entity = NULL;
- rq->sched = sched;
-}
-
-/**
- * drm_sched_rq_add_entity - add an entity
- *
- * @rq: scheduler run queue
- * @entity: scheduler entity
- *
- * Adds a scheduler entity to the run queue.
- */
-void drm_sched_rq_add_entity(struct drm_sched_rq *rq,
- struct drm_sched_entity *entity)
-{
- if (!list_empty(&entity->list))
- return;
- spin_lock(&rq->lock);
- list_add_tail(&entity->list, &rq->entities);
- spin_unlock(&rq->lock);
-}
-
-/**
- * drm_sched_rq_remove_entity - remove an entity
- *
- * @rq: scheduler run queue
- * @entity: scheduler entity
- *
- * Removes a scheduler entity from the run queue.
- */
-void drm_sched_rq_remove_entity(struct drm_sched_rq *rq,
- struct drm_sched_entity *entity)
-{
- if (list_empty(&entity->list))
- return;
- spin_lock(&rq->lock);
- list_del_init(&entity->list);
- if (rq->current_entity == entity)
- rq->current_entity = NULL;
- spin_unlock(&rq->lock);
-}
-
-/**
- * drm_sched_rq_select_entity - Select an entity which could provide a job to run
- *
- * @rq: scheduler run queue to check.
- *
- * Try to find a ready entity, returns NULL if none found.
- */
-static struct drm_sched_entity *
-drm_sched_rq_select_entity(struct drm_sched_rq *rq)
-{
- struct drm_sched_entity *entity;
-
- spin_lock(&rq->lock);
-
- entity = rq->current_entity;
- if (entity) {
- list_for_each_entry_continue(entity, &rq->entities, list) {
- if (drm_sched_entity_is_ready(entity)) {
- rq->current_entity = entity;
- spin_unlock(&rq->lock);
- return entity;
- }
- }
- }
-
- list_for_each_entry(entity, &rq->entities, list) {
-
- if (drm_sched_entity_is_ready(entity)) {
- rq->current_entity = entity;
- spin_unlock(&rq->lock);
- return entity;
- }
-
- if (entity == rq->current_entity)
- break;
- }
-
- spin_unlock(&rq->lock);
-
- return NULL;
-}
-
-/**
- * drm_sched_dependency_optimized
- *
- * @fence: the dependency fence
- * @entity: the entity which depends on the above fence
- *
- * Returns true if the dependency can be optimized and false otherwise
- */
-bool drm_sched_dependency_optimized(struct dma_fence* fence,
- struct drm_sched_entity *entity)
-{
- struct drm_gpu_scheduler *sched = entity->rq->sched;
- struct drm_sched_fence *s_fence;
-
- if (!fence || dma_fence_is_signaled(fence))
- return false;
- if (fence->context == entity->fence_context)
- return true;
- s_fence = to_drm_sched_fence(fence);
- if (s_fence && s_fence->sched == sched)
- return true;
-
- return false;
-}
-EXPORT_SYMBOL(drm_sched_dependency_optimized);
-
-/* job_finish is called after hw fence signaled
- */
-static void drm_sched_job_finish(struct work_struct *work)
-{
- struct drm_sched_job *s_job = container_of(work, struct drm_sched_job,
- finish_work);
- struct drm_gpu_scheduler *sched = s_job->sched;
-
- /*
- * Canceling the timeout without removing our job from the ring mirror
- * list is safe, as we will only end up in this worker if our jobs
- * finished fence has been signaled. So even if some another worker
- * manages to find this job as the next job in the list, the fence
- * signaled check below will prevent the timeout to be restarted.
- */
- cancel_delayed_work_sync(&s_job->work_tdr);
-
- spin_lock(&sched->job_list_lock);
- /* queue TDR for next job */
- if (sched->timeout != MAX_SCHEDULE_TIMEOUT &&
- !list_is_last(&s_job->node, &sched->ring_mirror_list)) {
- struct drm_sched_job *next = list_next_entry(s_job, node);
-
- if (!dma_fence_is_signaled(&next->s_fence->finished))
- schedule_delayed_work(&next->work_tdr, sched->timeout);
- }
- /* remove job from ring_mirror_list */
- list_del(&s_job->node);
- spin_unlock(&sched->job_list_lock);
-
- dma_fence_put(&s_job->s_fence->finished);
- sched->ops->free_job(s_job);
-}
-
-static void drm_sched_job_finish_cb(struct dma_fence *f,
- struct dma_fence_cb *cb)
-{
- struct drm_sched_job *job = container_of(cb, struct drm_sched_job,
- finish_cb);
- schedule_work(&job->finish_work);
-}
-
-static void drm_sched_job_begin(struct drm_sched_job *s_job)
-{
- struct drm_gpu_scheduler *sched = s_job->sched;
-
- dma_fence_add_callback(&s_job->s_fence->finished, &s_job->finish_cb,
- drm_sched_job_finish_cb);
-
- spin_lock(&sched->job_list_lock);
- list_add_tail(&s_job->node, &sched->ring_mirror_list);
- if (sched->timeout != MAX_SCHEDULE_TIMEOUT &&
- list_first_entry_or_null(&sched->ring_mirror_list,
- struct drm_sched_job, node) == s_job)
- schedule_delayed_work(&s_job->work_tdr, sched->timeout);
- spin_unlock(&sched->job_list_lock);
-}
-
-static void drm_sched_job_timedout(struct work_struct *work)
-{
- struct drm_sched_job *job = container_of(work, struct drm_sched_job,
- work_tdr.work);
-
- job->sched->ops->timedout_job(job);
-}
-
-/**
- * drm_sched_hw_job_reset - stop the scheduler if it contains the bad job
- *
- * @sched: scheduler instance
- * @bad: bad scheduler job
- *
- */
-void drm_sched_hw_job_reset(struct drm_gpu_scheduler *sched, struct drm_sched_job *bad)
-{
- struct drm_sched_job *s_job;
- struct drm_sched_entity *entity, *tmp;
- int i;
-
- spin_lock(&sched->job_list_lock);
- list_for_each_entry_reverse(s_job, &sched->ring_mirror_list, node) {
- if (s_job->s_fence->parent &&
- dma_fence_remove_callback(s_job->s_fence->parent,
- &s_job->s_fence->cb)) {
- dma_fence_put(s_job->s_fence->parent);
- s_job->s_fence->parent = NULL;
- atomic_dec(&sched->hw_rq_count);
- }
- }
- spin_unlock(&sched->job_list_lock);
-
- if (bad && bad->s_priority != DRM_SCHED_PRIORITY_KERNEL) {
- atomic_inc(&bad->karma);
- /* don't increase @bad's karma if it's from KERNEL RQ,
- * becuase sometimes GPU hang would cause kernel jobs (like VM updating jobs)
- * corrupt but keep in mind that kernel jobs always considered good.
- */
- for (i = DRM_SCHED_PRIORITY_MIN; i < DRM_SCHED_PRIORITY_KERNEL; i++ ) {
- struct drm_sched_rq *rq = &sched->sched_rq[i];
-
- spin_lock(&rq->lock);
- list_for_each_entry_safe(entity, tmp, &rq->entities, list) {
- if (bad->s_fence->scheduled.context == entity->fence_context) {
- if (atomic_read(&bad->karma) > bad->sched->hang_limit)
- if (entity->guilty)
- atomic_set(entity->guilty, 1);
- break;
- }
- }
- spin_unlock(&rq->lock);
- if (&entity->list != &rq->entities)
- break;
- }
- }
-}
-EXPORT_SYMBOL(drm_sched_hw_job_reset);
-
-/**
- * drm_sched_job_recovery - recover jobs after a reset
- *
- * @sched: scheduler instance
- *
- */
-void drm_sched_job_recovery(struct drm_gpu_scheduler *sched)
-{
- struct drm_sched_job *s_job, *tmp;
- bool found_guilty = false;
- int r;
-
- spin_lock(&sched->job_list_lock);
- s_job = list_first_entry_or_null(&sched->ring_mirror_list,
- struct drm_sched_job, node);
- if (s_job && sched->timeout != MAX_SCHEDULE_TIMEOUT)
- schedule_delayed_work(&s_job->work_tdr, sched->timeout);
-
- list_for_each_entry_safe(s_job, tmp, &sched->ring_mirror_list, node) {
- struct drm_sched_fence *s_fence = s_job->s_fence;
- struct dma_fence *fence;
- uint64_t guilty_context;
-
- if (!found_guilty && atomic_read(&s_job->karma) > sched->hang_limit) {
- found_guilty = true;
- guilty_context = s_job->s_fence->scheduled.context;
- }
-
- if (found_guilty && s_job->s_fence->scheduled.context == guilty_context)
- dma_fence_set_error(&s_fence->finished, -ECANCELED);
-
- spin_unlock(&sched->job_list_lock);
- fence = sched->ops->run_job(s_job);
- atomic_inc(&sched->hw_rq_count);
-
- if (fence) {
- s_fence->parent = dma_fence_get(fence);
- r = dma_fence_add_callback(fence, &s_fence->cb,
- drm_sched_process_job);
- if (r == -ENOENT)
- drm_sched_process_job(fence, &s_fence->cb);
- else if (r)
- DRM_ERROR("fence add callback failed (%d)\n",
- r);
- dma_fence_put(fence);
- } else {
- drm_sched_process_job(NULL, &s_fence->cb);
- }
- spin_lock(&sched->job_list_lock);
- }
- spin_unlock(&sched->job_list_lock);
-}
-EXPORT_SYMBOL(drm_sched_job_recovery);
-
-/**
- * drm_sched_job_init - init a scheduler job
- *
- * @job: scheduler job to init
- * @entity: scheduler entity to use
- * @owner: job owner for debugging
- *
- * Refer to drm_sched_entity_push_job() documentation
- * for locking considerations.
- *
- * Returns 0 for success, negative error code otherwise.
- */
-int drm_sched_job_init(struct drm_sched_job *job,
- struct drm_sched_entity *entity,
- void *owner)
-{
- struct drm_gpu_scheduler *sched;
-
- drm_sched_entity_select_rq(entity);
- sched = entity->rq->sched;
-
- job->sched = sched;
- job->entity = entity;
- job->s_priority = entity->rq - sched->sched_rq;
- job->s_fence = drm_sched_fence_create(entity, owner);
- if (!job->s_fence)
- return -ENOMEM;
- job->id = atomic64_inc_return(&sched->job_id_count);
-
- INIT_WORK(&job->finish_work, drm_sched_job_finish);
- INIT_LIST_HEAD(&job->node);
- INIT_DELAYED_WORK(&job->work_tdr, drm_sched_job_timedout);
-
- return 0;
-}
-EXPORT_SYMBOL(drm_sched_job_init);
-
-/**
- * drm_sched_ready - is the scheduler ready
- *
- * @sched: scheduler instance
- *
- * Return true if we can push more jobs to the hw, otherwise false.
- */
-static bool drm_sched_ready(struct drm_gpu_scheduler *sched)
-{
- return atomic_read(&sched->hw_rq_count) <
- sched->hw_submission_limit;
-}
-
-/**
- * drm_sched_wakeup - Wake up the scheduler when it is ready
- *
- * @sched: scheduler instance
- *
- */
-void drm_sched_wakeup(struct drm_gpu_scheduler *sched)
-{
- if (drm_sched_ready(sched))
- wake_up_interruptible(&sched->wake_up_worker);
-}
-
-/**
- * drm_sched_select_entity - Select next entity to process
- *
- * @sched: scheduler instance
- *
- * Returns the entity to process or NULL if none are found.
- */
-static struct drm_sched_entity *
-drm_sched_select_entity(struct drm_gpu_scheduler *sched)
-{
- struct drm_sched_entity *entity;
- int i;
-
- if (!drm_sched_ready(sched))
- return NULL;
-
- /* Kernel run queue has higher priority than normal run queue*/
- for (i = DRM_SCHED_PRIORITY_MAX - 1; i >= DRM_SCHED_PRIORITY_MIN; i--) {
- entity = drm_sched_rq_select_entity(&sched->sched_rq[i]);
- if (entity)
- break;
- }
-
- return entity;
-}
-
-/**
- * drm_sched_process_job - process a job
- *
- * @f: fence
- * @cb: fence callbacks
- *
- * Called after job has finished execution.
- */
-static void drm_sched_process_job(struct dma_fence *f, struct dma_fence_cb *cb)
-{
- struct drm_sched_fence *s_fence =
- container_of(cb, struct drm_sched_fence, cb);
- struct drm_gpu_scheduler *sched = s_fence->sched;
-
- dma_fence_get(&s_fence->finished);
- atomic_dec(&sched->hw_rq_count);
- atomic_dec(&sched->num_jobs);
- drm_sched_fence_finished(s_fence);
-
- trace_drm_sched_process_job(s_fence);
- dma_fence_put(&s_fence->finished);
- wake_up_interruptible(&sched->wake_up_worker);
-}
-
-/**
- * drm_sched_blocked - check if the scheduler is blocked
- *
- * @sched: scheduler instance
- *
- * Returns true if blocked, otherwise false.
- */
-static bool drm_sched_blocked(struct drm_gpu_scheduler *sched)
-{
- if (kthread_should_park()) {
- kthread_parkme();
- return true;
- }
-
- return false;
-}
-
-/**
- * drm_sched_main - main scheduler thread
- *
- * @param: scheduler instance
- *
- * Returns 0.
- */
-static int drm_sched_main(void *param)
-{
- struct sched_param sparam = {.sched_priority = 1};
- struct drm_gpu_scheduler *sched = (struct drm_gpu_scheduler *)param;
- int r;
-
- sched_setscheduler(current, SCHED_FIFO, &sparam);
-
- while (!kthread_should_stop()) {
- struct drm_sched_entity *entity = NULL;
- struct drm_sched_fence *s_fence;
- struct drm_sched_job *sched_job;
- struct dma_fence *fence;
-
- wait_event_interruptible(sched->wake_up_worker,
- (!drm_sched_blocked(sched) &&
- (entity = drm_sched_select_entity(sched))) ||
- kthread_should_stop());
-
- if (!entity)
- continue;
-
- sched_job = drm_sched_entity_pop_job(entity);
- if (!sched_job)
- continue;
-
- s_fence = sched_job->s_fence;
-
- atomic_inc(&sched->hw_rq_count);
- drm_sched_job_begin(sched_job);
-
- fence = sched->ops->run_job(sched_job);
- drm_sched_fence_scheduled(s_fence);
-
- if (fence) {
- s_fence->parent = dma_fence_get(fence);
- r = dma_fence_add_callback(fence, &s_fence->cb,
- drm_sched_process_job);
- if (r == -ENOENT)
- drm_sched_process_job(fence, &s_fence->cb);
- else if (r)
- DRM_ERROR("fence add callback failed (%d)\n",
- r);
- dma_fence_put(fence);
- } else {
- drm_sched_process_job(NULL, &s_fence->cb);
- }
-
- wake_up(&sched->job_scheduled);
- }
- return 0;
-}
-
-/**
- * drm_sched_init - Init a gpu scheduler instance
- *
- * @sched: scheduler instance
- * @ops: backend operations for this scheduler
- * @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
- * @name: name used for debugging
- *
- * Return 0 on success, otherwise error code.
- */
-int drm_sched_init(struct drm_gpu_scheduler *sched,
- const struct drm_sched_backend_ops *ops,
- unsigned hw_submission,
- unsigned hang_limit,
- long timeout,
- const char *name)
-{
- int i;
- sched->ops = ops;
- sched->hw_submission_limit = hw_submission;
- sched->name = name;
- sched->timeout = timeout;
- sched->hang_limit = hang_limit;
- for (i = DRM_SCHED_PRIORITY_MIN; i < DRM_SCHED_PRIORITY_MAX; i++)
- drm_sched_rq_init(sched, &sched->sched_rq[i]);
-
- init_waitqueue_head(&sched->wake_up_worker);
- init_waitqueue_head(&sched->job_scheduled);
- INIT_LIST_HEAD(&sched->ring_mirror_list);
- spin_lock_init(&sched->job_list_lock);
- atomic_set(&sched->hw_rq_count, 0);
- atomic_set(&sched->num_jobs, 0);
- atomic64_set(&sched->job_id_count, 0);
-
- /* Each scheduler will run on a seperate kernel thread */
- sched->thread = kthread_run(drm_sched_main, sched, sched->name);
- if (IS_ERR(sched->thread)) {
- DRM_ERROR("Failed to create scheduler for %s.\n", name);
- return PTR_ERR(sched->thread);
- }
-
- return 0;
-}
-EXPORT_SYMBOL(drm_sched_init);
-
-/**
- * drm_sched_fini - Destroy a gpu scheduler
- *
- * @sched: scheduler instance
- *
- * Tears down and cleans up the scheduler.
- */
-void drm_sched_fini(struct drm_gpu_scheduler *sched)
-{
- if (sched->thread)
- kthread_stop(sched->thread);
-}
-EXPORT_SYMBOL(drm_sched_fini);
--- /dev/null
+/*
+ * Copyright 2015 Advanced Micro Devices, Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ */
+
+/**
+ * DOC: Overview
+ *
+ * The GPU scheduler provides entities which allow userspace to push jobs
+ * into software queues which are then scheduled on a hardware run queue.
+ * The software queues have a priority among them. The scheduler selects the entities
+ * from the run queue using a FIFO. The scheduler provides dependency handling
+ * features among jobs. The driver is supposed to provide callback functions for
+ * backend operations to the scheduler like submitting a job to hardware run queue,
+ * returning the dependencies of a job etc.
+ *
+ * The organisation of the scheduler is the following:
+ *
+ * 1. Each hw run queue has one scheduler
+ * 2. Each scheduler has multiple run queues with different priorities
+ * (e.g., HIGH_HW,HIGH_SW, KERNEL, NORMAL)
+ * 3. Each scheduler run queue has a queue of entities to schedule
+ * 4. Entities themselves maintain a queue of jobs that will be scheduled on
+ * the hardware.
+ *
+ * The jobs in a entity are always scheduled in the order that they were pushed.
+ */
+
+#include <linux/kthread.h>
+#include <linux/wait.h>
+#include <linux/sched.h>
+#include <uapi/linux/sched/types.h>
+#include <drm/drmP.h>
+#include <drm/gpu_scheduler.h>
+#include <drm/spsc_queue.h>
+
+#define CREATE_TRACE_POINTS
+#include "gpu_scheduler_trace.h"
+
+#define to_drm_sched_job(sched_job) \
+ container_of((sched_job), struct drm_sched_job, queue_node)
+
+static void drm_sched_process_job(struct dma_fence *f, struct dma_fence_cb *cb);
+
+/**
+ * drm_sched_rq_init - initialize a given run queue struct
+ *
+ * @rq: scheduler run queue
+ *
+ * Initializes a scheduler runqueue.
+ */
+static void drm_sched_rq_init(struct drm_gpu_scheduler *sched,
+ struct drm_sched_rq *rq)
+{
+ spin_lock_init(&rq->lock);
+ INIT_LIST_HEAD(&rq->entities);
+ rq->current_entity = NULL;
+ rq->sched = sched;
+}
+
+/**
+ * drm_sched_rq_add_entity - add an entity
+ *
+ * @rq: scheduler run queue
+ * @entity: scheduler entity
+ *
+ * Adds a scheduler entity to the run queue.
+ */
+void drm_sched_rq_add_entity(struct drm_sched_rq *rq,
+ struct drm_sched_entity *entity)
+{
+ if (!list_empty(&entity->list))
+ return;
+ spin_lock(&rq->lock);
+ list_add_tail(&entity->list, &rq->entities);
+ spin_unlock(&rq->lock);
+}
+
+/**
+ * drm_sched_rq_remove_entity - remove an entity
+ *
+ * @rq: scheduler run queue
+ * @entity: scheduler entity
+ *
+ * Removes a scheduler entity from the run queue.
+ */
+void drm_sched_rq_remove_entity(struct drm_sched_rq *rq,
+ struct drm_sched_entity *entity)
+{
+ if (list_empty(&entity->list))
+ return;
+ spin_lock(&rq->lock);
+ list_del_init(&entity->list);
+ if (rq->current_entity == entity)
+ rq->current_entity = NULL;
+ spin_unlock(&rq->lock);
+}
+
+/**
+ * drm_sched_rq_select_entity - Select an entity which could provide a job to run
+ *
+ * @rq: scheduler run queue to check.
+ *
+ * Try to find a ready entity, returns NULL if none found.
+ */
+static struct drm_sched_entity *
+drm_sched_rq_select_entity(struct drm_sched_rq *rq)
+{
+ struct drm_sched_entity *entity;
+
+ spin_lock(&rq->lock);
+
+ entity = rq->current_entity;
+ if (entity) {
+ list_for_each_entry_continue(entity, &rq->entities, list) {
+ if (drm_sched_entity_is_ready(entity)) {
+ rq->current_entity = entity;
+ spin_unlock(&rq->lock);
+ return entity;
+ }
+ }
+ }
+
+ list_for_each_entry(entity, &rq->entities, list) {
+
+ if (drm_sched_entity_is_ready(entity)) {
+ rq->current_entity = entity;
+ spin_unlock(&rq->lock);
+ return entity;
+ }
+
+ if (entity == rq->current_entity)
+ break;
+ }
+
+ spin_unlock(&rq->lock);
+
+ return NULL;
+}
+
+/**
+ * drm_sched_dependency_optimized
+ *
+ * @fence: the dependency fence
+ * @entity: the entity which depends on the above fence
+ *
+ * Returns true if the dependency can be optimized and false otherwise
+ */
+bool drm_sched_dependency_optimized(struct dma_fence* fence,
+ struct drm_sched_entity *entity)
+{
+ struct drm_gpu_scheduler *sched = entity->rq->sched;
+ struct drm_sched_fence *s_fence;
+
+ if (!fence || dma_fence_is_signaled(fence))
+ return false;
+ if (fence->context == entity->fence_context)
+ return true;
+ s_fence = to_drm_sched_fence(fence);
+ if (s_fence && s_fence->sched == sched)
+ return true;
+
+ return false;
+}
+EXPORT_SYMBOL(drm_sched_dependency_optimized);
+
+/* job_finish is called after hw fence signaled
+ */
+static void drm_sched_job_finish(struct work_struct *work)
+{
+ struct drm_sched_job *s_job = container_of(work, struct drm_sched_job,
+ finish_work);
+ struct drm_gpu_scheduler *sched = s_job->sched;
+
+ /*
+ * Canceling the timeout without removing our job from the ring mirror
+ * list is safe, as we will only end up in this worker if our jobs
+ * finished fence has been signaled. So even if some another worker
+ * manages to find this job as the next job in the list, the fence
+ * signaled check below will prevent the timeout to be restarted.
+ */
+ cancel_delayed_work_sync(&s_job->work_tdr);
+
+ spin_lock(&sched->job_list_lock);
+ /* queue TDR for next job */
+ if (sched->timeout != MAX_SCHEDULE_TIMEOUT &&
+ !list_is_last(&s_job->node, &sched->ring_mirror_list)) {
+ struct drm_sched_job *next = list_next_entry(s_job, node);
+
+ if (!dma_fence_is_signaled(&next->s_fence->finished))
+ schedule_delayed_work(&next->work_tdr, sched->timeout);
+ }
+ /* remove job from ring_mirror_list */
+ list_del(&s_job->node);
+ spin_unlock(&sched->job_list_lock);
+
+ dma_fence_put(&s_job->s_fence->finished);
+ sched->ops->free_job(s_job);
+}
+
+static void drm_sched_job_finish_cb(struct dma_fence *f,
+ struct dma_fence_cb *cb)
+{
+ struct drm_sched_job *job = container_of(cb, struct drm_sched_job,
+ finish_cb);
+ schedule_work(&job->finish_work);
+}
+
+static void drm_sched_job_begin(struct drm_sched_job *s_job)
+{
+ struct drm_gpu_scheduler *sched = s_job->sched;
+
+ dma_fence_add_callback(&s_job->s_fence->finished, &s_job->finish_cb,
+ drm_sched_job_finish_cb);
+
+ spin_lock(&sched->job_list_lock);
+ list_add_tail(&s_job->node, &sched->ring_mirror_list);
+ if (sched->timeout != MAX_SCHEDULE_TIMEOUT &&
+ list_first_entry_or_null(&sched->ring_mirror_list,
+ struct drm_sched_job, node) == s_job)
+ schedule_delayed_work(&s_job->work_tdr, sched->timeout);
+ spin_unlock(&sched->job_list_lock);
+}
+
+static void drm_sched_job_timedout(struct work_struct *work)
+{
+ struct drm_sched_job *job = container_of(work, struct drm_sched_job,
+ work_tdr.work);
+
+ job->sched->ops->timedout_job(job);
+}
+
+/**
+ * drm_sched_hw_job_reset - stop the scheduler if it contains the bad job
+ *
+ * @sched: scheduler instance
+ * @bad: bad scheduler job
+ *
+ */
+void drm_sched_hw_job_reset(struct drm_gpu_scheduler *sched, struct drm_sched_job *bad)
+{
+ struct drm_sched_job *s_job;
+ struct drm_sched_entity *entity, *tmp;
+ int i;
+
+ spin_lock(&sched->job_list_lock);
+ list_for_each_entry_reverse(s_job, &sched->ring_mirror_list, node) {
+ if (s_job->s_fence->parent &&
+ dma_fence_remove_callback(s_job->s_fence->parent,
+ &s_job->s_fence->cb)) {
+ dma_fence_put(s_job->s_fence->parent);
+ s_job->s_fence->parent = NULL;
+ atomic_dec(&sched->hw_rq_count);
+ }
+ }
+ spin_unlock(&sched->job_list_lock);
+
+ if (bad && bad->s_priority != DRM_SCHED_PRIORITY_KERNEL) {
+ atomic_inc(&bad->karma);
+ /* don't increase @bad's karma if it's from KERNEL RQ,
+ * becuase sometimes GPU hang would cause kernel jobs (like VM updating jobs)
+ * corrupt but keep in mind that kernel jobs always considered good.
+ */
+ for (i = DRM_SCHED_PRIORITY_MIN; i < DRM_SCHED_PRIORITY_KERNEL; i++ ) {
+ struct drm_sched_rq *rq = &sched->sched_rq[i];
+
+ spin_lock(&rq->lock);
+ list_for_each_entry_safe(entity, tmp, &rq->entities, list) {
+ if (bad->s_fence->scheduled.context == entity->fence_context) {
+ if (atomic_read(&bad->karma) > bad->sched->hang_limit)
+ if (entity->guilty)
+ atomic_set(entity->guilty, 1);
+ break;
+ }
+ }
+ spin_unlock(&rq->lock);
+ if (&entity->list != &rq->entities)
+ break;
+ }
+ }
+}
+EXPORT_SYMBOL(drm_sched_hw_job_reset);
+
+/**
+ * drm_sched_job_recovery - recover jobs after a reset
+ *
+ * @sched: scheduler instance
+ *
+ */
+void drm_sched_job_recovery(struct drm_gpu_scheduler *sched)
+{
+ struct drm_sched_job *s_job, *tmp;
+ bool found_guilty = false;
+ int r;
+
+ spin_lock(&sched->job_list_lock);
+ s_job = list_first_entry_or_null(&sched->ring_mirror_list,
+ struct drm_sched_job, node);
+ if (s_job && sched->timeout != MAX_SCHEDULE_TIMEOUT)
+ schedule_delayed_work(&s_job->work_tdr, sched->timeout);
+
+ list_for_each_entry_safe(s_job, tmp, &sched->ring_mirror_list, node) {
+ struct drm_sched_fence *s_fence = s_job->s_fence;
+ struct dma_fence *fence;
+ uint64_t guilty_context;
+
+ if (!found_guilty && atomic_read(&s_job->karma) > sched->hang_limit) {
+ found_guilty = true;
+ guilty_context = s_job->s_fence->scheduled.context;
+ }
+
+ if (found_guilty && s_job->s_fence->scheduled.context == guilty_context)
+ dma_fence_set_error(&s_fence->finished, -ECANCELED);
+
+ spin_unlock(&sched->job_list_lock);
+ fence = sched->ops->run_job(s_job);
+ atomic_inc(&sched->hw_rq_count);
+
+ if (fence) {
+ s_fence->parent = dma_fence_get(fence);
+ r = dma_fence_add_callback(fence, &s_fence->cb,
+ drm_sched_process_job);
+ if (r == -ENOENT)
+ drm_sched_process_job(fence, &s_fence->cb);
+ else if (r)
+ DRM_ERROR("fence add callback failed (%d)\n",
+ r);
+ dma_fence_put(fence);
+ } else {
+ drm_sched_process_job(NULL, &s_fence->cb);
+ }
+ spin_lock(&sched->job_list_lock);
+ }
+ spin_unlock(&sched->job_list_lock);
+}
+EXPORT_SYMBOL(drm_sched_job_recovery);
+
+/**
+ * drm_sched_job_init - init a scheduler job
+ *
+ * @job: scheduler job to init
+ * @entity: scheduler entity to use
+ * @owner: job owner for debugging
+ *
+ * Refer to drm_sched_entity_push_job() documentation
+ * for locking considerations.
+ *
+ * Returns 0 for success, negative error code otherwise.
+ */
+int drm_sched_job_init(struct drm_sched_job *job,
+ struct drm_sched_entity *entity,
+ void *owner)
+{
+ struct drm_gpu_scheduler *sched;
+
+ drm_sched_entity_select_rq(entity);
+ sched = entity->rq->sched;
+
+ job->sched = sched;
+ job->entity = entity;
+ job->s_priority = entity->rq - sched->sched_rq;
+ job->s_fence = drm_sched_fence_create(entity, owner);
+ if (!job->s_fence)
+ return -ENOMEM;
+ job->id = atomic64_inc_return(&sched->job_id_count);
+
+ INIT_WORK(&job->finish_work, drm_sched_job_finish);
+ INIT_LIST_HEAD(&job->node);
+ INIT_DELAYED_WORK(&job->work_tdr, drm_sched_job_timedout);
+
+ return 0;
+}
+EXPORT_SYMBOL(drm_sched_job_init);
+
+/**
+ * drm_sched_ready - is the scheduler ready
+ *
+ * @sched: scheduler instance
+ *
+ * Return true if we can push more jobs to the hw, otherwise false.
+ */
+static bool drm_sched_ready(struct drm_gpu_scheduler *sched)
+{
+ return atomic_read(&sched->hw_rq_count) <
+ sched->hw_submission_limit;
+}
+
+/**
+ * drm_sched_wakeup - Wake up the scheduler when it is ready
+ *
+ * @sched: scheduler instance
+ *
+ */
+void drm_sched_wakeup(struct drm_gpu_scheduler *sched)
+{
+ if (drm_sched_ready(sched))
+ wake_up_interruptible(&sched->wake_up_worker);
+}
+
+/**
+ * drm_sched_select_entity - Select next entity to process
+ *
+ * @sched: scheduler instance
+ *
+ * Returns the entity to process or NULL if none are found.
+ */
+static struct drm_sched_entity *
+drm_sched_select_entity(struct drm_gpu_scheduler *sched)
+{
+ struct drm_sched_entity *entity;
+ int i;
+
+ if (!drm_sched_ready(sched))
+ return NULL;
+
+ /* Kernel run queue has higher priority than normal run queue*/
+ for (i = DRM_SCHED_PRIORITY_MAX - 1; i >= DRM_SCHED_PRIORITY_MIN; i--) {
+ entity = drm_sched_rq_select_entity(&sched->sched_rq[i]);
+ if (entity)
+ break;
+ }
+
+ return entity;
+}
+
+/**
+ * drm_sched_process_job - process a job
+ *
+ * @f: fence
+ * @cb: fence callbacks
+ *
+ * Called after job has finished execution.
+ */
+static void drm_sched_process_job(struct dma_fence *f, struct dma_fence_cb *cb)
+{
+ struct drm_sched_fence *s_fence =
+ container_of(cb, struct drm_sched_fence, cb);
+ struct drm_gpu_scheduler *sched = s_fence->sched;
+
+ dma_fence_get(&s_fence->finished);
+ atomic_dec(&sched->hw_rq_count);
+ atomic_dec(&sched->num_jobs);
+ drm_sched_fence_finished(s_fence);
+
+ trace_drm_sched_process_job(s_fence);
+ dma_fence_put(&s_fence->finished);
+ wake_up_interruptible(&sched->wake_up_worker);
+}
+
+/**
+ * drm_sched_blocked - check if the scheduler is blocked
+ *
+ * @sched: scheduler instance
+ *
+ * Returns true if blocked, otherwise false.
+ */
+static bool drm_sched_blocked(struct drm_gpu_scheduler *sched)
+{
+ if (kthread_should_park()) {
+ kthread_parkme();
+ return true;
+ }
+
+ return false;
+}
+
+/**
+ * drm_sched_main - main scheduler thread
+ *
+ * @param: scheduler instance
+ *
+ * Returns 0.
+ */
+static int drm_sched_main(void *param)
+{
+ struct sched_param sparam = {.sched_priority = 1};
+ struct drm_gpu_scheduler *sched = (struct drm_gpu_scheduler *)param;
+ int r;
+
+ sched_setscheduler(current, SCHED_FIFO, &sparam);
+
+ while (!kthread_should_stop()) {
+ struct drm_sched_entity *entity = NULL;
+ struct drm_sched_fence *s_fence;
+ struct drm_sched_job *sched_job;
+ struct dma_fence *fence;
+
+ wait_event_interruptible(sched->wake_up_worker,
+ (!drm_sched_blocked(sched) &&
+ (entity = drm_sched_select_entity(sched))) ||
+ kthread_should_stop());
+
+ if (!entity)
+ continue;
+
+ sched_job = drm_sched_entity_pop_job(entity);
+ if (!sched_job)
+ continue;
+
+ s_fence = sched_job->s_fence;
+
+ atomic_inc(&sched->hw_rq_count);
+ drm_sched_job_begin(sched_job);
+
+ fence = sched->ops->run_job(sched_job);
+ drm_sched_fence_scheduled(s_fence);
+
+ if (fence) {
+ s_fence->parent = dma_fence_get(fence);
+ r = dma_fence_add_callback(fence, &s_fence->cb,
+ drm_sched_process_job);
+ if (r == -ENOENT)
+ drm_sched_process_job(fence, &s_fence->cb);
+ else if (r)
+ DRM_ERROR("fence add callback failed (%d)\n",
+ r);
+ dma_fence_put(fence);
+ } else {
+ drm_sched_process_job(NULL, &s_fence->cb);
+ }
+
+ wake_up(&sched->job_scheduled);
+ }
+ return 0;
+}
+
+/**
+ * drm_sched_init - Init a gpu scheduler instance
+ *
+ * @sched: scheduler instance
+ * @ops: backend operations for this scheduler
+ * @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
+ * @name: name used for debugging
+ *
+ * Return 0 on success, otherwise error code.
+ */
+int drm_sched_init(struct drm_gpu_scheduler *sched,
+ const struct drm_sched_backend_ops *ops,
+ unsigned hw_submission,
+ unsigned hang_limit,
+ long timeout,
+ const char *name)
+{
+ int i;
+ sched->ops = ops;
+ sched->hw_submission_limit = hw_submission;
+ sched->name = name;
+ sched->timeout = timeout;
+ sched->hang_limit = hang_limit;
+ for (i = DRM_SCHED_PRIORITY_MIN; i < DRM_SCHED_PRIORITY_MAX; i++)
+ drm_sched_rq_init(sched, &sched->sched_rq[i]);
+
+ init_waitqueue_head(&sched->wake_up_worker);
+ init_waitqueue_head(&sched->job_scheduled);
+ INIT_LIST_HEAD(&sched->ring_mirror_list);
+ spin_lock_init(&sched->job_list_lock);
+ atomic_set(&sched->hw_rq_count, 0);
+ atomic_set(&sched->num_jobs, 0);
+ atomic64_set(&sched->job_id_count, 0);
+
+ /* Each scheduler will run on a seperate kernel thread */
+ sched->thread = kthread_run(drm_sched_main, sched, sched->name);
+ if (IS_ERR(sched->thread)) {
+ DRM_ERROR("Failed to create scheduler for %s.\n", name);
+ return PTR_ERR(sched->thread);
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL(drm_sched_init);
+
+/**
+ * drm_sched_fini - Destroy a gpu scheduler
+ *
+ * @sched: scheduler instance
+ *
+ * Tears down and cleans up the scheduler.
+ */
+void drm_sched_fini(struct drm_gpu_scheduler *sched)
+{
+ if (sched->thread)
+ kthread_stop(sched->thread);
+}
+EXPORT_SYMBOL(drm_sched_fini);
projects / openwrt / staging / blogic.git / commitdiff