From 93efbe785dcae0d47add1d68f03e498aeea55663 Mon Sep 17 00:00:00 2001 From: Nayan Deshmukh Date: Wed, 1 Aug 2018 13:50:01 +0530 Subject: [PATCH 0696/2940] drm/scheduler: add new function to get least loaded sched v2 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit The function selects the run queue from the rq_list with the least load. The load is decided by the number of jobs in a scheduler. v2: avoid using atomic read twice consecutively, instead store it locally Signed-off-by: Nayan Deshmukh Reviewed-by: Christian König Signed-off-by: Alex Deucher --- drivers/gpu/drm/scheduler/gpu_scheduler.c | 25 +++++++++++++++++++++++ 1 file changed, 25 insertions(+) diff --git a/drivers/gpu/drm/scheduler/gpu_scheduler.c b/drivers/gpu/drm/scheduler/gpu_scheduler.c index d3d8ab454780..cc3b310da2e7 100644 --- a/drivers/gpu/drm/scheduler/gpu_scheduler.c +++ b/drivers/gpu/drm/scheduler/gpu_scheduler.c @@ -241,6 +241,31 @@ static bool drm_sched_entity_is_ready(struct drm_sched_entity *entity) return true; } +/** + * drm_sched_entity_get_free_sched - Get the rq from rq_list with least load + * + * @entity: scheduler entity + * + * Return the pointer to the rq with least load. + */ +static struct drm_sched_rq * +drm_sched_entity_get_free_sched(struct drm_sched_entity *entity) +{ + struct drm_sched_rq *rq = NULL; + unsigned int min_jobs = UINT_MAX, num_jobs; + int i; + + for (i = 0; i < entity->num_rq_list; ++i) { + num_jobs = atomic_read(&entity->rq_list[i]->sched->num_jobs); + if (num_jobs < min_jobs) { + min_jobs = num_jobs; + rq = entity->rq_list[i]; + } + } + + return rq; +} + static void drm_sched_entity_kill_jobs_cb(struct dma_fence *f, struct dma_fence_cb *cb) { -- 2.17.1