On 2/20/20 2:35 PM, Liu, Monk wrote:
Sorry, my previous idea still leave RQ null, please check if below method works:
29 static struct drm_sched_rq *
130 drm_sched_entity_get_free_sched(struct drm_sched_entity *entity)
131 {
132 struct drm_sched_rq *rq = NULL;
133 unsigned int min_jobs = UINT_MAX, num_jobs;
134 int i;
135
While (!mutex_trylock(....))
Sleep()
We can't do that drm_sched_entity_get_free_sched is in another
module(drm scheduler) independent of amdgpu
136 for (i = 0; i < entity->num_rq_list; ++i) {
137 struct drm_gpu_scheduler *sched = entity->rq_list[i]->sched;
138
139 if (!entity->rq_list[i]->sched->ready) { //we take the gpu reset mutex lock, so now sched->ready won't be set to "not ready"
140 DRM_WARN("sched%s is not ready, skipping", sched->name);
141 continue;
142 }
143
144 num_jobs = atomic_read(&sched->num_jobs);
145 if (num_jobs < min_jobs) {
146 min_jobs = num_jobs;
147 rq = entity->rq_list[i];
148 }
149 }
Mutex_unlock(...)
150
151 return rq;
152 }
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