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drm/i915/gvt: factor out the scheduler
Factor out the scheduler to a more clear structure, the basic logic is to find out next vGPU first and then schedule it. vGPUs were ordered in a LRU list, scheduler scan from the LRU list head and choose the first vGPU who has pending workload. Signed-off-by: Ping Gao <ping.a.gao@intel.com> Reviewed-by: Kevin Tian <kevin.tian@intel.com> Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
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@ -48,7 +48,7 @@ static bool vgpu_has_pending_workload(struct intel_vgpu *vgpu)
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}
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struct vgpu_sched_data {
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struct list_head list;
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struct list_head lru_list;
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struct intel_vgpu *vgpu;
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ktime_t sched_in_time;
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@ -64,7 +64,7 @@ struct gvt_sched_data {
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struct intel_gvt *gvt;
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struct hrtimer timer;
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unsigned long period;
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struct list_head runq_head;
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struct list_head lru_runq_head;
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};
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static void try_to_schedule_next_vgpu(struct intel_gvt *gvt)
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@ -118,36 +118,17 @@ static void try_to_schedule_next_vgpu(struct intel_gvt *gvt)
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wake_up(&scheduler->waitq[i]);
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}
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/* in nanosecond */
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#define GVT_DEFAULT_TIME_SLICE 1000000
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static void tbs_sched_func(struct gvt_sched_data *sched_data)
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static struct intel_vgpu *find_busy_vgpu(struct gvt_sched_data *sched_data)
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{
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struct vgpu_sched_data *vgpu_data;
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struct intel_gvt *gvt = sched_data->gvt;
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struct intel_gvt_workload_scheduler *scheduler = &gvt->scheduler;
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struct intel_vgpu *vgpu = NULL;
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struct list_head *pos, *head;
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/* no vgpu or has already had a target */
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if (list_empty(&sched_data->runq_head) || scheduler->next_vgpu)
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goto out;
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if (scheduler->current_vgpu) {
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vgpu_data = scheduler->current_vgpu->sched_data;
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head = &vgpu_data->list;
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} else {
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head = &sched_data->runq_head;
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}
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struct list_head *head = &sched_data->lru_runq_head;
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struct list_head *pos;
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/* search a vgpu with pending workload */
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list_for_each(pos, head) {
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if (pos == &sched_data->runq_head)
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continue;
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vgpu_data = container_of(pos, struct vgpu_sched_data, list);
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vgpu_data = container_of(pos, struct vgpu_sched_data, lru_list);
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if (!vgpu_has_pending_workload(vgpu_data->vgpu))
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continue;
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@ -155,8 +136,33 @@ static void tbs_sched_func(struct gvt_sched_data *sched_data)
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break;
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}
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return vgpu;
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}
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/* in nanosecond */
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#define GVT_DEFAULT_TIME_SLICE 1000000
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static void tbs_sched_func(struct gvt_sched_data *sched_data)
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{
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struct intel_gvt *gvt = sched_data->gvt;
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struct intel_gvt_workload_scheduler *scheduler = &gvt->scheduler;
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struct vgpu_sched_data *vgpu_data;
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struct intel_vgpu *vgpu = NULL;
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/* no active vgpu or has already had a target */
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if (list_empty(&sched_data->lru_runq_head) || scheduler->next_vgpu)
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goto out;
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vgpu = find_busy_vgpu(sched_data);
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if (vgpu) {
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scheduler->next_vgpu = vgpu;
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/* Move the last used vGPU to the tail of lru_list */
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vgpu_data = vgpu->sched_data;
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list_del_init(&vgpu_data->lru_list);
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list_add_tail(&vgpu_data->lru_list,
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&sched_data->lru_runq_head);
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gvt_dbg_sched("pick next vgpu %d\n", vgpu->id);
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}
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out:
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@ -200,7 +206,7 @@ static int tbs_sched_init(struct intel_gvt *gvt)
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if (!data)
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return -ENOMEM;
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INIT_LIST_HEAD(&data->runq_head);
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INIT_LIST_HEAD(&data->lru_runq_head);
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hrtimer_init(&data->timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
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data->timer.function = tbs_timer_fn;
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data->period = GVT_DEFAULT_TIME_SLICE;
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@ -232,7 +238,7 @@ static int tbs_sched_init_vgpu(struct intel_vgpu *vgpu)
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return -ENOMEM;
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data->vgpu = vgpu;
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INIT_LIST_HEAD(&data->list);
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INIT_LIST_HEAD(&data->lru_list);
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vgpu->sched_data = data;
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@ -250,10 +256,10 @@ static void tbs_sched_start_schedule(struct intel_vgpu *vgpu)
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struct gvt_sched_data *sched_data = vgpu->gvt->scheduler.sched_data;
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struct vgpu_sched_data *vgpu_data = vgpu->sched_data;
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if (!list_empty(&vgpu_data->list))
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if (!list_empty(&vgpu_data->lru_list))
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return;
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list_add_tail(&vgpu_data->list, &sched_data->runq_head);
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list_add_tail(&vgpu_data->lru_list, &sched_data->lru_runq_head);
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if (!hrtimer_active(&sched_data->timer))
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hrtimer_start(&sched_data->timer, ktime_add_ns(ktime_get(),
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@ -264,7 +270,7 @@ static void tbs_sched_stop_schedule(struct intel_vgpu *vgpu)
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{
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struct vgpu_sched_data *vgpu_data = vgpu->sched_data;
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list_del_init(&vgpu_data->list);
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list_del_init(&vgpu_data->lru_list);
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}
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static struct intel_gvt_sched_policy_ops tbs_schedule_ops = {
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