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drm/scheduler: add new function to get least loaded sched v2

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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>
This commit is contained in:
Nayan Deshmukh 2018-08-01 13:50:01 +05:30 committed by Alex Deucher
parent 249a07c05a
commit 97ffa35b5d
1 changed files with 25 additions and 0 deletions
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25
drivers/gpu/drm/scheduler/gpu_scheduler.c
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@ -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)
{