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From 93efbe785dcae0d47add1d68f03e498aeea55663 Mon Sep 17 00:00:00 2001
From: Nayan Deshmukh <nayan26deshmukh@gmail.com>
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 <nayan26deshmukh@gmail.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
---
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
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