Orange Pi5 kernel

/*
 * Copyright(c) 2011-2016 Intel Corporation. All rights reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *
 * Authors:
 *    Anhua Xu
 *    Kevin Tian <kevin.tian@intel.com>
 *
 * Contributors:
 *    Min He <min.he@intel.com>
 *    Bing Niu <bing.niu@intel.com>
 *    Zhi Wang <zhi.a.wang@intel.com>
 *
 */
 
#include "i915_drv.h"
#include "gvt.h"
 
static bool vgpu_has_pending_workload(struct intel_vgpu *vgpu)
{
<------>enum intel_engine_id i;
<------>struct intel_engine_cs *engine;
 
<------>for_each_engine(engine, vgpu->gvt->gt, i) {
<------><------>if (!list_empty(workload_q_head(vgpu, engine)))
<------><------><------>return true;
<------>}
 
<------>return false;
}
 
/* We give 2 seconds higher prio for vGPU during start */
#define GVT_SCHED_VGPU_PRI_TIME  2
 
struct vgpu_sched_data {
<------>struct list_head lru_list;
<------>struct intel_vgpu *vgpu;
<------>bool active;
<------>bool pri_sched;
<------>ktime_t pri_time;
<------>ktime_t sched_in_time;
<------>ktime_t sched_time;
<------>ktime_t left_ts;
<------>ktime_t allocated_ts;
 
<------>struct vgpu_sched_ctl sched_ctl;
};
 
struct gvt_sched_data {
<------>struct intel_gvt *gvt;
<------>struct hrtimer timer;
<------>unsigned long period;
<------>struct list_head lru_runq_head;
<------>ktime_t expire_time;
};
 
static void vgpu_update_timeslice(struct intel_vgpu *vgpu, ktime_t cur_time)
{
<------>ktime_t delta_ts;
<------>struct vgpu_sched_data *vgpu_data;
 
<------>if (!vgpu || vgpu == vgpu->gvt->idle_vgpu)
<------><------>return;
 
<------>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);
<------>vgpu_data->sched_in_time = 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)
{
<------>struct vgpu_sched_data *vgpu_data;
<------>struct list_head *pos;
<------>static u64 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.
<------> */
<------>if (stage == 0) {
<------><------>int total_weight = 0;
<------><------>ktime_t fair_timeslice;
 
<------><------>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) {
<------><------><------>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;
 
<------><------><------>vgpu_data->allocated_ts = fair_timeslice;
<------><------><------>vgpu_data->left_ts = vgpu_data->allocated_ts;
<------><------>}
<------>} else {
<------><------>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
<------><------><------> * slice of previous stages.
<------><------><------> */
<------><------><------>vgpu_data->left_ts += vgpu_data->allocated_ts;
<------><------>}
<------>}
}
 
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 == scheduler->current_vgpu) {
<------><------>scheduler->next_vgpu = NULL;
<------><------>return;
<------>}
 
<------>/*
<------> * after the flag is set, workload dispatch thread will
<------> * stop dispatching workload for current vgpu
<------> */
<------>scheduler->need_reschedule = true;
 
<------>/* still have uncompleted workload? */
<------>for_each_engine(engine, gvt->gt, i) {
<------><------>if (scheduler->current_workload[engine->id])
<------><------><------>return;
<------>}
 
<------>cur_time = ktime_get();
<------>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 = scheduler->next_vgpu;
<------>scheduler->next_vgpu = NULL;
 
<------>scheduler->need_reschedule = false;
 
<------>/* wake up workload dispatch thread */
<------>for_each_engine(engine, gvt->gt, i)
<------><------>wake_up(&scheduler->waitq[engine->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;
<------>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))
<------><------><------>continue;
 
<------><------>if (vgpu_data->pri_sched) {
<------><------><------>if (ktime_before(ktime_get(), vgpu_data->pri_time)) {
<------><------><------><------>vgpu = vgpu_data->vgpu;
<------><------><------><------>break;
<------><------><------>} else
<------><------><------><------>vgpu_data->pri_sched = false;
<------><------>}
 
<------><------>/* Return the vGPU only if it has time slice left */
<------><------>if (vgpu_data->left_ts > 0) {
<------><------><------>vgpu = vgpu_data->vgpu;
<------><------><------>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;
<------><------>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);
<------><------>}
<------>} else {
<------><------>scheduler->next_vgpu = gvt->idle_vgpu;
<------>}
out:
<------>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;
 
<------>mutex_lock(&gvt->sched_lock);
<------>cur_time = ktime_get();
 
<------>if (test_and_clear_bit(INTEL_GVT_REQUEST_SCHED,
<------><------><------><------>(void *)&gvt->service_request)) {
<------><------>if (cur_time >= sched_data->expire_time) {
<------><------><------>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);
 
<------>vgpu_update_timeslice(gvt->scheduler.current_vgpu, cur_time);
<------>tbs_sched_func(sched_data);
 
<------>mutex_unlock(&gvt->sched_lock);
}
 
static enum hrtimer_restart tbs_timer_fn(struct hrtimer *timer_data)
{
<------>struct gvt_sched_data *data;
 
<------>data = container_of(timer_data, struct gvt_sched_data, timer);
 
<------>intel_gvt_request_service(data->gvt, INTEL_GVT_REQUEST_SCHED);
 
<------>hrtimer_add_expires_ns(&data->timer, data->period);
 
<------>return HRTIMER_RESTART;
}
 
static int tbs_sched_init(struct intel_gvt *gvt)
{
<------>struct intel_gvt_workload_scheduler *scheduler =
<------><------>&gvt->scheduler;
 
<------>struct gvt_sched_data *data;
 
<------>data = kzalloc(sizeof(*data), GFP_KERNEL);
<------>if (!data)
<------><------>return -ENOMEM;
 
<------>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;
<------>data->gvt = gvt;
 
<------>scheduler->sched_data = data;
 
<------>return 0;
}
 
static void tbs_sched_clean(struct intel_gvt *gvt)
{
<------>struct intel_gvt_workload_scheduler *scheduler =
<------><------>&gvt->scheduler;
<------>struct gvt_sched_data *data = scheduler->sched_data;
 
<------>hrtimer_cancel(&data->timer);
 
<------>kfree(data);
<------>scheduler->sched_data = NULL;
}
 
static int tbs_sched_init_vgpu(struct intel_vgpu *vgpu)
{
<------>struct vgpu_sched_data *data;
 
<------>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);
 
<------>vgpu->sched_data = data;
 
<------>return 0;
}
 
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;
 
<------>kfree(vgpu->sched_data);
<------>vgpu->sched_data = NULL;
 
<------>/* this vgpu id has been removed */
<------>if (idr_is_empty(&gvt->vgpu_idr))
<------><------>hrtimer_cancel(&sched_data->timer);
}
 
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;
 
<------>if (!list_empty(&vgpu_data->lru_list))
<------><------>return;
 
<------>now = ktime_get();
<------>vgpu_data->pri_time = ktime_add(now,
<------><------><------><------><------>ktime_set(GVT_SCHED_VGPU_PRI_TIME, 0));
<------>vgpu_data->pri_sched = 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 = vgpu->sched_data;
 
<------>list_del_init(&vgpu_data->lru_list);
<------>vgpu_data->active = false;
}
 
static struct intel_gvt_sched_policy_ops tbs_schedule_ops = {
<------>.init = tbs_sched_init,
<------>.clean = tbs_sched_clean,
<------>.init_vgpu = tbs_sched_init_vgpu,
<------>.clean_vgpu = tbs_sched_clean_vgpu,
<------>.start_schedule = tbs_sched_start_schedule,
<------>.stop_schedule = tbs_sched_stop_schedule,
};
 
int intel_gvt_init_sched_policy(struct intel_gvt *gvt)
{
<------>int ret;
 
<------>mutex_lock(&gvt->sched_lock);
<------>gvt->scheduler.sched_ops = &tbs_schedule_ops;
<------>ret = gvt->scheduler.sched_ops->init(gvt);
<------>mutex_unlock(&gvt->sched_lock);
 
<------>return ret;
}
 
void intel_gvt_clean_sched_policy(struct intel_gvt *gvt)
{
<------>mutex_lock(&gvt->sched_lock);
<------>gvt->scheduler.sched_ops->clean(gvt);
<------>mutex_unlock(&gvt->sched_lock);
}
 
/* for per-vgpu scheduler policy, there are 2 per-vgpu data:
 * sched_data, and sched_ctl. We see these 2 data as part of
 * the global scheduler which are proteced by gvt->sched_lock.
 * Caller should make their decision if the vgpu_lock should
 * be hold outside.
 */
 
int intel_vgpu_init_sched_policy(struct intel_vgpu *vgpu)
{
<------>int ret;
 
<------>mutex_lock(&vgpu->gvt->sched_lock);
<------>ret = vgpu->gvt->scheduler.sched_ops->init_vgpu(vgpu);
<------>mutex_unlock(&vgpu->gvt->sched_lock);
 
<------>return ret;
}
 
void intel_vgpu_clean_sched_policy(struct intel_vgpu *vgpu)
{
<------>mutex_lock(&vgpu->gvt->sched_lock);
<------>vgpu->gvt->scheduler.sched_ops->clean_vgpu(vgpu);
<------>mutex_unlock(&vgpu->gvt->sched_lock);
}
 
void intel_vgpu_start_schedule(struct intel_vgpu *vgpu)
{
<------>struct vgpu_sched_data *vgpu_data = vgpu->sched_data;
 
<------>mutex_lock(&vgpu->gvt->sched_lock);
<------>if (!vgpu_data->active) {
<------><------>gvt_dbg_core("vgpu%d: start schedule\n", vgpu->id);
<------><------>vgpu->gvt->scheduler.sched_ops->start_schedule(vgpu);
<------>}
<------>mutex_unlock(&vgpu->gvt->sched_lock);
}
 
void intel_gvt_kick_schedule(struct intel_gvt *gvt)
{
<------>mutex_lock(&gvt->sched_lock);
<------>intel_gvt_request_service(gvt, INTEL_GVT_REQUEST_EVENT_SCHED);
<------>mutex_unlock(&gvt->sched_lock);
}
 
void intel_vgpu_stop_schedule(struct intel_vgpu *vgpu)
{
<------>struct intel_gvt_workload_scheduler *scheduler =
<------><------>&vgpu->gvt->scheduler;
<------>struct vgpu_sched_data *vgpu_data = vgpu->sched_data;
<------>struct drm_i915_private *dev_priv = vgpu->gvt->gt->i915;
<------>struct intel_engine_cs *engine;
<------>enum intel_engine_id id;
 
<------>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);
 
<------>if (scheduler->next_vgpu == vgpu)
<------><------>scheduler->next_vgpu = NULL;
 
<------>if (scheduler->current_vgpu == vgpu) {
<------><------>/* stop workload dispatching */
<------><------>scheduler->need_reschedule = true;
<------><------>scheduler->current_vgpu = NULL;
<------>}
 
<------>intel_runtime_pm_get(&dev_priv->runtime_pm);
<------>spin_lock_bh(&scheduler->mmio_context_lock);
<------>for_each_engine(engine, vgpu->gvt->gt, id) {
<------><------>if (scheduler->engine_owner[engine->id] == vgpu) {
<------><------><------>intel_gvt_switch_mmio(vgpu, NULL, engine);
<------><------><------>scheduler->engine_owner[engine->id] = NULL;
<------><------>}
<------>}
<------>spin_unlock_bh(&scheduler->mmio_context_lock);
<------>intel_runtime_pm_put_unchecked(&dev_priv->runtime_pm);
<------>mutex_unlock(&vgpu->gvt->sched_lock);
}