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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Liu Xinyun <xinyun.liu@intel.com>
Date: Wed, 18 Sep 2019 23:53:23 +0800
Subject: [PATCH] Revert "drm/i915/gvt: preliminary per ring scheduler"
To bring back non-context registers save/restore, per-ring scheduler
should be reverted.
This reverts commit 3b8744f541ee84b87615b8e72b67337dc3d564b3.
Tracked-On: projectacrn/acrn-hypervisor#3830
Signed-off-by: Liu Xinyun <xinyun.liu@intel.com>
Reviewed-by: Zhao Yakui <yakui.zhao@intel.com>
---
drivers/gpu/drm/i915/gvt/gvt.h | 2 +-
drivers/gpu/drm/i915/gvt/sched_policy.c | 212 +++++++++---------------
drivers/gpu/drm/i915/gvt/scheduler.c | 17 +-
drivers/gpu/drm/i915/gvt/scheduler.h | 6 +-
drivers/gpu/drm/i915/gvt/vgpu.c | 7 +-
5 files changed, 92 insertions(+), 152 deletions(-)
diff --git a/drivers/gpu/drm/i915/gvt/gvt.h b/drivers/gpu/drm/i915/gvt/gvt.h
index c821c2861ec5..e881bbdd87f8 100644
--- a/drivers/gpu/drm/i915/gvt/gvt.h
+++ b/drivers/gpu/drm/i915/gvt/gvt.h
@@ -202,7 +202,7 @@ struct intel_vgpu {
* scheduler structure. So below 2 vgpu data are protected
* by sched_lock, not vgpu_lock.
*/
- void *sched_data[I915_NUM_ENGINES];
+ void *sched_data;
struct vgpu_sched_ctl sched_ctl;
struct intel_vgpu_fence fence;
diff --git a/drivers/gpu/drm/i915/gvt/sched_policy.c b/drivers/gpu/drm/i915/gvt/sched_policy.c
index f5127e07570b..4fac40d26549 100644
--- a/drivers/gpu/drm/i915/gvt/sched_policy.c
+++ b/drivers/gpu/drm/i915/gvt/sched_policy.c
@@ -34,11 +34,15 @@
#include "i915_drv.h"
#include "gvt.h"
-static bool vgpu_has_pending_workload(struct intel_vgpu *vgpu,
- enum intel_engine_id ring_id)
+static bool vgpu_has_pending_workload(struct intel_vgpu *vgpu)
{
- if (!list_empty(workload_q_head(vgpu, ring_id)))
- return true;
+ enum intel_engine_id i;
+ struct intel_engine_cs *engine;
+
+ for_each_engine(engine, vgpu->gvt->dev_priv, i) {
+ if (!list_empty(workload_q_head(vgpu, i)))
+ return true;
+ }
return false;
}
@@ -64,12 +68,11 @@ struct gvt_sched_data {
struct intel_gvt *gvt;
struct hrtimer timer;
unsigned long period;
- struct list_head lru_runq_head[I915_NUM_ENGINES];
+ struct list_head lru_runq_head;
ktime_t expire_time;
};
-static void vgpu_update_timeslice(struct intel_vgpu *vgpu, ktime_t cur_time,
- enum intel_engine_id ring_id)
+static void vgpu_update_timeslice(struct intel_vgpu *vgpu, ktime_t cur_time)
{
ktime_t delta_ts;
struct vgpu_sched_data *vgpu_data;
@@ -77,7 +80,7 @@ static void vgpu_update_timeslice(struct intel_vgpu *vgpu, ktime_t cur_time,
if (!vgpu || vgpu == vgpu->gvt->idle_vgpu)
return;
- vgpu_data = vgpu->sched_data[ring_id];
+ vgpu_data = vgpu->sched_data;
delta_ts = ktime_sub(cur_time, vgpu_data->sched_in_time);
vgpu_data->sched_time = ktime_add(vgpu_data->sched_time, delta_ts);
vgpu_data->left_ts = ktime_sub(vgpu_data->left_ts, delta_ts);
@@ -87,13 +90,12 @@ static void vgpu_update_timeslice(struct intel_vgpu *vgpu, ktime_t cur_time,
#define GVT_TS_BALANCE_PERIOD_MS 100
#define GVT_TS_BALANCE_STAGE_NUM 10
-static void gvt_balance_timeslice(struct gvt_sched_data *sched_data,
- enum intel_engine_id ring_id)
+static void gvt_balance_timeslice(struct gvt_sched_data *sched_data)
{
struct vgpu_sched_data *vgpu_data;
struct list_head *pos;
- static uint64_t stage_check[I915_NUM_ENGINES];
- int stage = stage_check[ring_id]++ % GVT_TS_BALANCE_STAGE_NUM;
+ static uint64_t stage_check;
+ int stage = stage_check++ % GVT_TS_BALANCE_STAGE_NUM;
/* The timeslice accumulation reset at stage 0, which is
* allocated again without adding previous debt.
@@ -102,12 +104,12 @@ static void gvt_balance_timeslice(struct gvt_sched_data *sched_data,
int total_weight = 0;
ktime_t fair_timeslice;
- list_for_each(pos, &sched_data->lru_runq_head[ring_id]) {
+ list_for_each(pos, &sched_data->lru_runq_head) {
vgpu_data = container_of(pos, struct vgpu_sched_data, lru_list);
total_weight += vgpu_data->sched_ctl.weight;
}
- list_for_each(pos, &sched_data->lru_runq_head[ring_id]) {
+ list_for_each(pos, &sched_data->lru_runq_head) {
vgpu_data = container_of(pos, struct vgpu_sched_data, lru_list);
fair_timeslice = ktime_divns(ms_to_ktime(GVT_TS_BALANCE_PERIOD_MS),
total_weight) * vgpu_data->sched_ctl.weight;
@@ -116,7 +118,7 @@ static void gvt_balance_timeslice(struct gvt_sched_data *sched_data,
vgpu_data->left_ts = vgpu_data->allocated_ts;
}
} else {
- list_for_each(pos, &sched_data->lru_runq_head[ring_id]) {
+ list_for_each(pos, &sched_data->lru_runq_head) {
vgpu_data = container_of(pos, struct vgpu_sched_data, lru_list);
/* timeslice for next 100ms should add the left/debt
@@ -127,63 +129,62 @@ static void gvt_balance_timeslice(struct gvt_sched_data *sched_data,
}
}
-static void try_to_schedule_next_vgpu(struct intel_gvt *gvt,
- enum intel_engine_id ring_id)
+static void try_to_schedule_next_vgpu(struct intel_gvt *gvt)
{
struct intel_gvt_workload_scheduler *scheduler = &gvt->scheduler;
+ enum intel_engine_id i;
+ struct intel_engine_cs *engine;
struct vgpu_sched_data *vgpu_data;
ktime_t cur_time;
/* no need to schedule if next_vgpu is the same with current_vgpu,
* let scheduler chose next_vgpu again by setting it to NULL.
*/
- if (scheduler->next_vgpu[ring_id] ==
- scheduler->current_vgpu[ring_id]) {
- scheduler->next_vgpu[ring_id] = NULL;
+ if (scheduler->next_vgpu == scheduler->current_vgpu) {
+ scheduler->next_vgpu = NULL;
return;
}
- /* no target to schedule */
- if (!scheduler->next_vgpu[ring_id])
- return;
/*
* after the flag is set, workload dispatch thread will
* stop dispatching workload for current vgpu
*/
- scheduler->need_reschedule[ring_id] = true;
+ scheduler->need_reschedule = true;
/* still have uncompleted workload? */
- if (scheduler->current_workload[ring_id])
- return;
+ for_each_engine(engine, gvt->dev_priv, i) {
+ if (scheduler->current_workload[i])
+ return;
+ }
cur_time = ktime_get();
- vgpu_update_timeslice(scheduler->current_vgpu[ring_id], cur_time, ring_id);
- vgpu_data = scheduler->next_vgpu[ring_id]->sched_data[ring_id];
+ vgpu_update_timeslice(scheduler->current_vgpu, cur_time);
+ vgpu_data = scheduler->next_vgpu->sched_data;
vgpu_data->sched_in_time = cur_time;
/* switch current vgpu */
- scheduler->current_vgpu[ring_id] = scheduler->next_vgpu[ring_id];
- scheduler->next_vgpu[ring_id] = NULL;
+ scheduler->current_vgpu = scheduler->next_vgpu;
+ scheduler->next_vgpu = NULL;
- scheduler->need_reschedule[ring_id] = false;
+ scheduler->need_reschedule = false;
/* wake up workload dispatch thread */
- wake_up(&scheduler->waitq[ring_id]);
+ for_each_engine(engine, gvt->dev_priv, i)
+ wake_up(&scheduler->waitq[i]);
}
-static struct intel_vgpu *find_busy_vgpu(struct gvt_sched_data *sched_data,
- enum intel_engine_id ring_id)
+static struct intel_vgpu *find_busy_vgpu(struct gvt_sched_data *sched_data)
{
struct vgpu_sched_data *vgpu_data;
struct intel_vgpu *vgpu = NULL;
- struct list_head *head = &sched_data->lru_runq_head[ring_id];
+ struct list_head *head = &sched_data->lru_runq_head;
struct list_head *pos;
/* search a vgpu with pending workload */
list_for_each(pos, head) {
vgpu_data = container_of(pos, struct vgpu_sched_data, lru_list);
- if (!vgpu_has_pending_workload(vgpu_data->vgpu, ring_id))
+ if (!vgpu_has_pending_workload(vgpu_data->vgpu))
continue;
if (vgpu_data->pri_sched) {
@@ -207,8 +208,7 @@ static struct intel_vgpu *find_busy_vgpu(struct gvt_sched_data *sched_data,
/* in nanosecond */
#define GVT_DEFAULT_TIME_SLICE 1000000
-static void tbs_sched_func(struct gvt_sched_data *sched_data,
- enum intel_engine_id ring_id)
+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;
@@ -216,34 +216,31 @@ static void tbs_sched_func(struct gvt_sched_data *sched_data,
struct intel_vgpu *vgpu = NULL;
/* no active vgpu or has already had a target */
- if (list_empty(&sched_data->lru_runq_head[ring_id])
- || scheduler->next_vgpu[ring_id])
+ if (list_empty(&sched_data->lru_runq_head) || scheduler->next_vgpu)
goto out;
- vgpu = find_busy_vgpu(sched_data, ring_id);
+ vgpu = find_busy_vgpu(sched_data);
if (vgpu) {
- scheduler->next_vgpu[ring_id] = vgpu;
- vgpu_data = vgpu->sched_data[ring_id];
+ scheduler->next_vgpu = vgpu;
+ vgpu_data = vgpu->sched_data;
if (!vgpu_data->pri_sched) {
/* Move the last used vGPU to the tail of lru_list */
list_del_init(&vgpu_data->lru_list);
list_add_tail(&vgpu_data->lru_list,
- &sched_data->lru_runq_head[ring_id]);
+ &sched_data->lru_runq_head);
}
} else {
- scheduler->next_vgpu[ring_id] = gvt->idle_vgpu;
+ scheduler->next_vgpu = gvt->idle_vgpu;
}
out:
- if (scheduler->next_vgpu[ring_id])
- try_to_schedule_next_vgpu(gvt, ring_id);
+ if (scheduler->next_vgpu)
+ try_to_schedule_next_vgpu(gvt);
}
void intel_gvt_schedule(struct intel_gvt *gvt)
{
struct gvt_sched_data *sched_data = gvt->scheduler.sched_data;
ktime_t cur_time;
- enum intel_engine_id i;
- struct intel_engine_cs *engine;
mutex_lock(&gvt->sched_lock);
cur_time = ktime_get();
@@ -251,19 +248,15 @@ void intel_gvt_schedule(struct intel_gvt *gvt)
if (test_and_clear_bit(INTEL_GVT_REQUEST_SCHED,
(void *)&gvt->service_request)) {
if (cur_time >= sched_data->expire_time) {
- for_each_engine(engine, gvt->dev_priv, i)
- gvt_balance_timeslice(sched_data, i);
+ gvt_balance_timeslice(sched_data);
sched_data->expire_time = ktime_add_ms(
cur_time, GVT_TS_BALANCE_PERIOD_MS);
}
}
clear_bit(INTEL_GVT_REQUEST_EVENT_SCHED, (void *)&gvt->service_request);
- for_each_engine(engine, gvt->dev_priv, i) {
- vgpu_update_timeslice(gvt->scheduler.current_vgpu[i],
- cur_time, i);
- tbs_sched_func(sched_data, i);
- }
+ vgpu_update_timeslice(gvt->scheduler.current_vgpu, cur_time);
+ tbs_sched_func(sched_data);
mutex_unlock(&gvt->sched_lock);
}
@@ -283,9 +276,6 @@ static enum hrtimer_restart tbs_timer_fn(struct hrtimer *timer_data)
static int tbs_sched_init(struct intel_gvt *gvt)
{
- enum intel_engine_id i;
- struct intel_engine_cs *engine;
-
struct intel_gvt_workload_scheduler *scheduler =
&gvt->scheduler;
@@ -295,9 +285,7 @@ static int tbs_sched_init(struct intel_gvt *gvt)
if (!data)
return -ENOMEM;
- for_each_engine(engine, gvt->dev_priv, i)
- INIT_LIST_HEAD(&data->lru_runq_head[i]);
-
+ 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;
@@ -323,29 +311,18 @@ static void tbs_sched_clean(struct intel_gvt *gvt)
static int tbs_sched_init_vgpu(struct intel_vgpu *vgpu)
{
struct vgpu_sched_data *data;
- enum intel_engine_id i;
- struct intel_engine_cs *engine;
- for_each_engine(engine, vgpu->gvt->dev_priv, i) {
- data = kzalloc(sizeof(*data), GFP_KERNEL);
- if (!data)
- goto err;
+ data = kzalloc(sizeof(*data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
- data->sched_ctl.weight = vgpu->sched_ctl.weight;
- data->vgpu = vgpu;
- INIT_LIST_HEAD(&data->lru_list);
+ data->sched_ctl.weight = vgpu->sched_ctl.weight;
+ data->vgpu = vgpu;
+ INIT_LIST_HEAD(&data->lru_list);
- vgpu->sched_data[i] = data;
- }
+ vgpu->sched_data = data;
return 0;
-
-err:
- for (; i >= 0; i--) {
- kfree(vgpu->sched_data[i]);
- vgpu->sched_data[i] = NULL;
- }
- return -ENOMEM;
}
static void tbs_sched_clean_vgpu(struct intel_vgpu *vgpu)
@@ -353,13 +330,8 @@ static void tbs_sched_clean_vgpu(struct intel_vgpu *vgpu)
struct intel_gvt *gvt = vgpu->gvt;
struct gvt_sched_data *sched_data = gvt->scheduler.sched_data;
- enum intel_engine_id i;
- struct intel_engine_cs *engine;
-
- for_each_engine(engine, vgpu->gvt->dev_priv, i) {
- kfree(vgpu->sched_data[i]);
- vgpu->sched_data[i] = NULL;
- }
+ kfree(vgpu->sched_data);
+ vgpu->sched_data = NULL;
/* this vgpu id has been removed */
if (idr_is_empty(&gvt->vgpu_idr))
@@ -369,42 +341,31 @@ static void tbs_sched_clean_vgpu(struct intel_vgpu *vgpu)
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;
ktime_t now;
- struct vgpu_sched_data *vgpu_data;
- enum intel_engine_id i;
- struct intel_engine_cs *engine;
- for_each_engine(engine, vgpu->gvt->dev_priv, i) {
- vgpu_data = vgpu->sched_data[i];
- if (!list_empty(&vgpu_data->lru_list))
- continue;
+ if (!list_empty(&vgpu_data->lru_list))
+ return;
- now = ktime_get();
- vgpu_data->pri_time = ktime_add(now,
+ now = ktime_get();
+ vgpu_data->pri_time = ktime_add(now,
ktime_set(GVT_SCHED_VGPU_PRI_TIME, 0));
- vgpu_data->pri_sched = true;
+ vgpu_data->pri_sched = true;
- list_add(&vgpu_data->lru_list, &sched_data->lru_runq_head[i]);
- vgpu_data->active = true;
- }
+ list_add(&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(),
sched_data->period), HRTIMER_MODE_ABS);
+ vgpu_data->active = true;
}
static void tbs_sched_stop_schedule(struct intel_vgpu *vgpu)
{
- struct vgpu_sched_data *vgpu_data;
- enum intel_engine_id i;
- struct intel_engine_cs *engine;
-
- for_each_engine(engine, vgpu->gvt->dev_priv, i) {
- vgpu_data = vgpu->sched_data[i];
+ struct vgpu_sched_data *vgpu_data = vgpu->sched_data;
- list_del_init(&vgpu_data->lru_list);
- vgpu_data->active = false;
- }
+ list_del_init(&vgpu_data->lru_list);
+ vgpu_data->active = false;
}
static struct intel_gvt_sched_policy_ops tbs_schedule_ops = {
@@ -462,16 +423,10 @@ void intel_vgpu_clean_sched_policy(struct intel_vgpu *vgpu)
void intel_vgpu_start_schedule(struct intel_vgpu *vgpu)
{
- struct vgpu_sched_data *vgpu_data;
- struct intel_engine_cs *engine;
- enum intel_engine_id i;
+ struct vgpu_sched_data *vgpu_data = vgpu->sched_data;
mutex_lock(&vgpu->gvt->sched_lock);
- for_each_engine(engine, vgpu->gvt->dev_priv, i) {
- vgpu_data = vgpu->sched_data[i];
- if (vgpu_data->active)
- continue;
-
+ if (!vgpu_data->active) {
gvt_dbg_core("vgpu%d: start schedule\n", vgpu->id);
vgpu->gvt->scheduler.sched_ops->start_schedule(vgpu);
}
@@ -489,26 +444,23 @@ void intel_vgpu_stop_schedule(struct intel_vgpu *vgpu)
{
struct intel_gvt_workload_scheduler *scheduler =
&vgpu->gvt->scheduler;
- struct vgpu_sched_data *vgpu_data;
- enum intel_engine_id i;
- struct intel_engine_cs *engine;
+ struct vgpu_sched_data *vgpu_data = vgpu->sched_data;
+
+ if (!vgpu_data->active)
+ return;
gvt_dbg_core("vgpu%d: stop schedule\n", vgpu->id);
mutex_lock(&vgpu->gvt->sched_lock);
scheduler->sched_ops->stop_schedule(vgpu);
- for_each_engine(engine, vgpu->gvt->dev_priv, i) {
- vgpu_data = vgpu->sched_data[i];
-
- if (scheduler->next_vgpu[i] == vgpu)
- scheduler->next_vgpu[i] = NULL;
+ if (scheduler->next_vgpu == vgpu)
+ scheduler->next_vgpu = NULL;
- if (scheduler->current_vgpu[i] == vgpu) {
- /* stop workload dispatching */
- scheduler->need_reschedule[i] = true;
- scheduler->current_vgpu[i] = NULL;
- }
+ if (scheduler->current_vgpu == vgpu) {
+ /* stop workload dispatching */
+ scheduler->need_reschedule = true;
+ scheduler->current_vgpu = NULL;
}
mutex_unlock(&vgpu->gvt->sched_lock);
diff --git a/drivers/gpu/drm/i915/gvt/scheduler.c b/drivers/gpu/drm/i915/gvt/scheduler.c
index 975c75f243d6..7ebbcd22c024 100644
--- a/drivers/gpu/drm/i915/gvt/scheduler.c
+++ b/drivers/gpu/drm/i915/gvt/scheduler.c
@@ -775,23 +775,17 @@ static struct intel_vgpu_workload *pick_next_workload(
* no current vgpu / will be scheduled out / no workload
* bail out
*/
- if (!scheduler->current_vgpu[ring_id]) {
+ if (!scheduler->current_vgpu) {
gvt_dbg_sched("ring id %d stop - no current vgpu\n", ring_id);
goto out;
}
- if (!scheduler->current_vgpu[ring_id]->active) {
- gvt_dbg_sched("ring id %d stop - vgpu not active\n", ring_id);
- goto out;
- }
-
- if (scheduler->need_reschedule[ring_id]) {
+ if (scheduler->need_reschedule) {
gvt_dbg_sched("ring id %d stop - will reschedule\n", ring_id);
goto out;
}
- if (list_empty(workload_q_head(scheduler->current_vgpu[ring_id],
- ring_id)))
+ if (list_empty(workload_q_head(scheduler->current_vgpu, ring_id)))
goto out;
/*
@@ -812,8 +806,7 @@ static struct intel_vgpu_workload *pick_next_workload(
* schedule out a vgpu.
*/
scheduler->current_workload[ring_id] = container_of(
- workload_q_head(scheduler->current_vgpu[ring_id],
- ring_id)->next,
+ workload_q_head(scheduler->current_vgpu, ring_id)->next,
struct intel_vgpu_workload, list);
workload = scheduler->current_workload[ring_id];
@@ -1001,7 +994,7 @@ static void complete_current_workload(struct intel_gvt *gvt, int ring_id)
atomic_dec(&s->running_workload_num);
wake_up(&scheduler->workload_complete_wq);
- if (gvt->scheduler.need_reschedule[ring_id])
+ if (gvt->scheduler.need_reschedule)
intel_gvt_request_service(gvt, INTEL_GVT_REQUEST_EVENT_SCHED);
mutex_unlock(&gvt->sched_lock);
diff --git a/drivers/gpu/drm/i915/gvt/scheduler.h b/drivers/gpu/drm/i915/gvt/scheduler.h
index 3cec02d2ac1a..043c2ff07a7c 100644
--- a/drivers/gpu/drm/i915/gvt/scheduler.h
+++ b/drivers/gpu/drm/i915/gvt/scheduler.h
@@ -37,10 +37,10 @@
#define _GVT_SCHEDULER_H_
struct intel_gvt_workload_scheduler {
- struct intel_vgpu *current_vgpu[I915_NUM_ENGINES];
- struct intel_vgpu *next_vgpu[I915_NUM_ENGINES];
+ struct intel_vgpu *current_vgpu;
+ struct intel_vgpu *next_vgpu;
struct intel_vgpu_workload *current_workload[I915_NUM_ENGINES];
- bool need_reschedule[I915_NUM_ENGINES];
+ bool need_reschedule;
spinlock_t mmio_context_lock;
/* can be null when owner is host */
diff --git a/drivers/gpu/drm/i915/gvt/vgpu.c b/drivers/gpu/drm/i915/gvt/vgpu.c
index fa66cabaab77..d1ee64508528 100644
--- a/drivers/gpu/drm/i915/gvt/vgpu.c
+++ b/drivers/gpu/drm/i915/gvt/vgpu.c
@@ -557,8 +557,6 @@ void intel_gvt_reset_vgpu_locked(struct intel_vgpu *vgpu, bool dmlr,
struct intel_gvt *gvt = vgpu->gvt;
struct intel_gvt_workload_scheduler *scheduler = &gvt->scheduler;
unsigned int resetting_eng = dmlr ? ALL_ENGINES : engine_mask;
- enum intel_engine_id i;
- struct intel_engine_cs *engine;
bool enable_pvmmio = vgpu_vreg_t(vgpu, vgtif_reg(enable_pvmmio));
gvt_dbg_core("------------------------------------------\n");
@@ -572,10 +570,7 @@ void intel_gvt_reset_vgpu_locked(struct intel_vgpu *vgpu, bool dmlr,
* The current_vgpu will set to NULL after stopping the
* scheduler when the reset is triggered by current vgpu.
*/
- for_each_engine_masked(engine, gvt->dev_priv, resetting_eng, i) {
- if (scheduler->current_vgpu[i] != NULL)
- continue;
-
+ if (scheduler->current_vgpu == NULL) {
mutex_unlock(&vgpu->vgpu_lock);
intel_gvt_wait_vgpu_idle(vgpu);
mutex_lock(&vgpu->vgpu_lock);
--
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