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drm/i915/gvt: factor out the scheduler

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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>
This commit is contained in:
Ping Gao 2017-03-30 00:36:36 +08:00 committed by Zhenyu Wang
parent f6504cce54
commit 32356920da
1 changed files with 36 additions and 30 deletions
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66
drivers/gpu/drm/i915/gvt/sched_policy.c
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@ -48,7 +48,7 @@ static bool vgpu_has_pending_workload(struct intel_vgpu *vgpu)
}
struct vgpu_sched_data {
struct list_head list;
struct list_head lru_list;
struct intel_vgpu *vgpu;
ktime_t sched_in_time;
@ -64,7 +64,7 @@ struct gvt_sched_data {
struct intel_gvt *gvt;
struct hrtimer timer;
unsigned long period;
struct list_head runq_head;
struct list_head lru_runq_head;
};
static void try_to_schedule_next_vgpu(struct intel_gvt *gvt)
@ -118,36 +118,17 @@ static void try_to_schedule_next_vgpu(struct intel_gvt *gvt)
wake_up(&scheduler->waitq[i]);
}
/* in nanosecond */
#define GVT_DEFAULT_TIME_SLICE 1000000
static void tbs_sched_func(struct gvt_sched_data *sched_data)
static struct intel_vgpu *find_busy_vgpu(struct gvt_sched_data *sched_data)
{
struct vgpu_sched_data *vgpu_data;
struct intel_gvt *gvt = sched_data->gvt;
struct intel_gvt_workload_scheduler *scheduler = &gvt->scheduler;
struct intel_vgpu *vgpu = NULL;
struct list_head *pos, *head;
/* no vgpu or has already had a target */
if (list_empty(&sched_data->runq_head) || scheduler->next_vgpu)
goto out;
if (scheduler->current_vgpu) {
vgpu_data = scheduler->current_vgpu->sched_data;
head = &vgpu_data->list;
} else {
head = &sched_data->runq_head;
}
struct list_head *head = &sched_data->lru_runq_head;
struct list_head *pos;
/* search a vgpu with pending workload */
list_for_each(pos, head) {
if (pos == &sched_data->runq_head)
continue;
vgpu_data = container_of(pos, struct vgpu_sched_data, list);
vgpu_data = container_of(pos, struct vgpu_sched_data, lru_list);
if (!vgpu_has_pending_workload(vgpu_data->vgpu))
continue;
@ -155,8 +136,33 @@ static void tbs_sched_func(struct gvt_sched_data *sched_data)
break;
}
return vgpu;
}
/* in nanosecond */
#define GVT_DEFAULT_TIME_SLICE 1000000
static void tbs_sched_func(struct gvt_sched_data *sched_data)
{
struct intel_gvt *gvt = sched_data->gvt;
struct intel_gvt_workload_scheduler *scheduler = &gvt->scheduler;
struct vgpu_sched_data *vgpu_data;
struct intel_vgpu *vgpu = NULL;
/* no active vgpu or has already had a target */
if (list_empty(&sched_data->lru_runq_head) || scheduler->next_vgpu)
goto out;
vgpu = find_busy_vgpu(sched_data);
if (vgpu) {
scheduler->next_vgpu = vgpu;
/* Move the last used vGPU to the tail of lru_list */
vgpu_data = vgpu->sched_data;
list_del_init(&vgpu_data->lru_list);
list_add_tail(&vgpu_data->lru_list,
&sched_data->lru_runq_head);
gvt_dbg_sched("pick next vgpu %d\n", vgpu->id);
}
out:
@ -200,7 +206,7 @@ static int tbs_sched_init(struct intel_gvt *gvt)
if (!data)
return -ENOMEM;
INIT_LIST_HEAD(&data->runq_head);
INIT_LIST_HEAD(&data->lru_runq_head);
hrtimer_init(&data->timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
data->timer.function = tbs_timer_fn;
data->period = GVT_DEFAULT_TIME_SLICE;
@ -232,7 +238,7 @@ static int tbs_sched_init_vgpu(struct intel_vgpu *vgpu)
return -ENOMEM;
data->vgpu = vgpu;
INIT_LIST_HEAD(&data->list);
INIT_LIST_HEAD(&data->lru_list);
vgpu->sched_data = data;
@ -250,10 +256,10 @@ static void tbs_sched_start_schedule(struct intel_vgpu *vgpu)
struct gvt_sched_data *sched_data = vgpu->gvt->scheduler.sched_data;
struct vgpu_sched_data *vgpu_data = vgpu->sched_data;
if (!list_empty(&vgpu_data->list))
if (!list_empty(&vgpu_data->lru_list))
return;
list_add_tail(&vgpu_data->list, &sched_data->runq_head);
list_add_tail(&vgpu_data->lru_list, &sched_data->lru_runq_head);
if (!hrtimer_active(&sched_data->timer))
hrtimer_start(&sched_data->timer, ktime_add_ns(ktime_get(),
@ -264,7 +270,7 @@ static void tbs_sched_stop_schedule(struct intel_vgpu *vgpu)
{
struct vgpu_sched_data *vgpu_data = vgpu->sched_data;
list_del_init(&vgpu_data->list);
list_del_init(&vgpu_data->lru_list);
}
static struct intel_gvt_sched_policy_ops tbs_schedule_ops = {