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064be1e3e6
When all vCPU threads on one pCPU are put to sleep (e.g., when all
guests execute HLT), hv would schedule to idle thread. Currently the
idle thread executes PAUSE which does not enter any c-state and consumes
a lot of power. This patch is to support HLT in the idle thread.
When we switch to HLT, we have to make sure events that would wake a
vCPU must also be able to wake the pCPU. Those events are either
generated by local interrupt or issued by other pCPUs followed by an
ipi kick.
Each of them have an interrupt involved, so they are also able to wake
the halted pCPU. Except when the pCPU has just scheduled to idle thread
but not yet halted, interrupts could be missed.
sleep-------schedule to idle------IRQ ON---HLT--(kick missed)
^
wake---kick|
This areas should be protected. This is done by a safe halt
mechanism leveraging STI instruction’s delay effect (same as Linux).
vCPUs with lapic_pt or hv with CONFIG_KEEP_IRQ_DISABLED=y does not allow
interrupts in root mode, so they could never wake from HLT (INIT kick
does not wake HLT in root mode either). They should continue using PAUSE
in idle.
Tracked-On: #8507
Signed-off-by: Wu Zhou <wu.zhou@intel.com>
Reviewed-by: Junjie Mao <junjie.mao@intel.com>
140 lines
3.4 KiB
C
140 lines
3.4 KiB
C
/*
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* Copyright (C) 2018-2022 Intel Corporation.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#ifndef SCHEDULE_H
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#define SCHEDULE_H
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#include <asm/lib/spinlock.h>
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#include <lib/list.h>
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#include <timer.h>
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#define NEED_RESCHEDULE (1U)
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#define DEL_MODE_INIT (1U)
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#define DEL_MODE_IPI (2U)
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#define IDLE_MODE_PAUSE (1U)
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#define IDLE_MODE_HLT (2U)
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#define THREAD_DATA_SIZE (256U)
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enum thread_object_state {
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THREAD_STS_RUNNING = 1,
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THREAD_STS_RUNNABLE,
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THREAD_STS_BLOCKED
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};
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/* Tools can configure a VM to use PRIO_LOW or PRIO_HIGH */
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enum thread_priority {
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PRIO_IDLE = 0,
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PRIO_LOW,
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PRIO_HIGH,
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PRIO_MAX
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};
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struct thread_object;
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typedef void (*thread_entry_t)(struct thread_object *obj);
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typedef void (*switch_t)(struct thread_object *obj);
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struct thread_object {
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char name[16];
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uint16_t pcpu_id;
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struct sched_control *sched_ctl;
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thread_entry_t thread_entry;
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volatile enum thread_object_state status;
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bool be_blocking;
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uint64_t host_sp;
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switch_t switch_out;
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switch_t switch_in;
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int priority;
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uint8_t data[THREAD_DATA_SIZE];
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};
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struct sched_control {
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uint16_t pcpu_id;
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uint64_t flags;
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struct thread_object *curr_obj;
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spinlock_t scheduler_lock; /* to protect sched_control and thread_object */
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struct acrn_scheduler *scheduler;
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void *priv;
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};
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#define SCHEDULER_MAX_NUMBER 4U
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struct acrn_scheduler {
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char name[16];
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/* init scheduler */
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int32_t (*init)(struct sched_control *ctl);
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/* init private data of scheduler */
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void (*init_data)(struct thread_object *obj);
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/* pick the next thread object */
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struct thread_object* (*pick_next)(struct sched_control *ctl);
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/* put thread object into sleep */
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void (*sleep)(struct thread_object *obj);
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/* wake up thread object from sleep status */
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void (*wake)(struct thread_object *obj);
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/* yield current thread object */
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void (*yield)(struct sched_control *ctl);
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/* prioritize the thread object */
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void (*prioritize)(struct thread_object *obj);
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/* deinit private data of scheduler */
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void (*deinit_data)(struct thread_object *obj);
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/* deinit scheduler */
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void (*deinit)(struct sched_control *ctl);
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};
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extern struct acrn_scheduler sched_noop;
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extern struct acrn_scheduler sched_iorr;
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struct sched_noop_control {
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struct thread_object *noop_thread_obj;
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};
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struct sched_iorr_control {
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struct list_head runqueue;
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struct hv_timer tick_timer;
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};
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extern struct acrn_scheduler sched_bvt;
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struct sched_bvt_control {
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struct list_head runqueue;
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struct hv_timer tick_timer;
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/* The minimum AVT of any runnable threads */
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int64_t svt;
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};
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extern struct acrn_scheduler sched_prio;
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struct sched_prio_control {
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struct list_head prio_queue;
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};
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bool is_idle_thread(const struct thread_object *obj);
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uint16_t sched_get_pcpuid(const struct thread_object *obj);
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struct thread_object *sched_get_current(uint16_t pcpu_id);
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void init_sched(uint16_t pcpu_id);
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void deinit_sched(uint16_t pcpu_id);
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void obtain_schedule_lock(uint16_t pcpu_id, uint64_t *rflag);
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void release_schedule_lock(uint16_t pcpu_id, uint64_t rflag);
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void init_thread_data(struct thread_object *obj);
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void deinit_thread_data(struct thread_object *obj);
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void make_reschedule_request(uint16_t pcpu_id);
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bool need_reschedule(uint16_t pcpu_id);
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void run_thread(struct thread_object *obj);
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void sleep_thread(struct thread_object *obj);
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void sleep_thread_sync(struct thread_object *obj);
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void wake_thread(struct thread_object *obj);
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void yield_current(void);
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void schedule(void);
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void arch_switch_to(void *prev_sp, void *next_sp);
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void run_idle_thread(void);
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#endif /* SCHEDULE_H */
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