mirror of
https://github.com/projectacrn/acrn-hypervisor.git
synced 2025-05-31 03:15:42 +00:00
e05eb42c1e
Add init function for bvt scheduler, creating a runqueue and a period timer, the timer interval is default as 1ms. The interval is the minimum charging unit. Tracked-On: #4410 Signed-off-by: Conghui Chen <conghui.chen@intel.com> Signed-off-by: Shuo A Liu <shuo.a.liu@intel.com> Acked-by: Eddie Dong <eddie.dong@intel.com>
103 lines
2.5 KiB
C
103 lines
2.5 KiB
C
/*
|
|
* Copyright (C) 2020 Intel Corporation. All rights reserved.
|
|
*
|
|
* SPDX-License-Identifier: BSD-3-Clause
|
|
*/
|
|
|
|
#include <list.h>
|
|
#include <per_cpu.h>
|
|
#include <schedule.h>
|
|
|
|
#define BVT_MCU_MS 1U
|
|
/* context switch allowance */
|
|
#define BVT_CSA_MCU 5U
|
|
struct sched_bvt_data {
|
|
/* keep list as the first item */
|
|
struct list_head list;
|
|
/* minimum charging unit in cycles */
|
|
uint64_t mcu;
|
|
/* a thread receives a share of cpu in proportion to its weight */
|
|
uint16_t weight;
|
|
/* virtual time advance variable, proportional to 1 / weight */
|
|
uint64_t vt_ratio;
|
|
/* the count down number of mcu until reschedule should take place */
|
|
uint64_t run_countdown;
|
|
/* actual virtual time in units of mcu */
|
|
int64_t avt;
|
|
/* effective virtual time in units of mcu */
|
|
int64_t evt;
|
|
|
|
uint64_t start_tsc;
|
|
};
|
|
|
|
static void sched_tick_handler(__unused void *param)
|
|
{
|
|
}
|
|
|
|
/*
|
|
*@pre: ctl->pcpu_id == get_pcpu_id()
|
|
*/
|
|
static int sched_bvt_init(struct sched_control *ctl)
|
|
{
|
|
struct sched_bvt_control *bvt_ctl = &per_cpu(sched_bvt_ctl, ctl->pcpu_id);
|
|
uint64_t tick_period = BVT_MCU_MS * CYCLES_PER_MS;
|
|
int ret = 0;
|
|
|
|
ASSERT(ctl->pcpu_id == get_pcpu_id(), "Init scheduler on wrong CPU!");
|
|
|
|
ctl->priv = bvt_ctl;
|
|
INIT_LIST_HEAD(&bvt_ctl->runqueue);
|
|
|
|
/* The tick_timer is periodically */
|
|
initialize_timer(&bvt_ctl->tick_timer, sched_tick_handler, ctl,
|
|
rdtsc() + tick_period, TICK_MODE_PERIODIC, tick_period);
|
|
|
|
if (add_timer(&bvt_ctl->tick_timer) < 0) {
|
|
pr_err("Failed to add schedule tick timer!");
|
|
ret = -1;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void sched_bvt_deinit(struct sched_control *ctl)
|
|
{
|
|
struct sched_bvt_control *bvt_ctl = (struct sched_bvt_control *)ctl->priv;
|
|
del_timer(&bvt_ctl->tick_timer);
|
|
}
|
|
|
|
static void sched_bvt_init_data(struct thread_object *obj)
|
|
{
|
|
struct sched_bvt_data *data;
|
|
|
|
data = (struct sched_bvt_data *)obj->data;
|
|
INIT_LIST_HEAD(&data->list);
|
|
data->mcu = BVT_MCU_MS * CYCLES_PER_MS;
|
|
/* TODO: virtual time advance ratio should be proportional to weight. */
|
|
data->vt_ratio = 1U;
|
|
data->run_countdown = BVT_CSA_MCU;
|
|
}
|
|
|
|
static struct thread_object *sched_bvt_pick_next(__unused struct sched_control *ctl)
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
static void sched_bvt_sleep(__unused struct thread_object *obj)
|
|
{
|
|
}
|
|
|
|
static void sched_bvt_wake(__unused struct thread_object *obj)
|
|
{
|
|
}
|
|
|
|
struct acrn_scheduler sched_bvt = {
|
|
.name = "sched_bvt",
|
|
.init = sched_bvt_init,
|
|
.init_data = sched_bvt_init_data,
|
|
.pick_next = sched_bvt_pick_next,
|
|
.sleep = sched_bvt_sleep,
|
|
.wake = sched_bvt_wake,
|
|
.deinit = sched_bvt_deinit,
|
|
};
|