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/*
* Accelerator blocking API, to prevent new ioctls from starting and wait the
* running ones finish.
* This mechanism differs from pause/resume_all_vcpus() in that it does not
* release the BQL.
*
* Copyright (c) 2022 Red Hat Inc.
*
* Author: Emanuele Giuseppe Esposito <eesposit@redhat.com>
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*/
#ifndef ACCEL_BLOCKER_H
#define ACCEL_BLOCKER_H
#include "system/cpus.h"
void accel_blocker_init(void);
/*
* accel_{cpu_}ioctl_begin/end:
* Mark when ioctl is about to run or just finished.
*
* accel_{cpu_}ioctl_begin will block after accel_ioctl_inhibit_begin() is
* called, preventing new ioctls to run. They will continue only after
* accel_ioctl_inibith_end().
*/
void accel_ioctl_begin(void);
void accel_ioctl_end(void);
void accel_cpu_ioctl_begin(CPUState *cpu);
void accel_cpu_ioctl_end(CPUState *cpu);
/*
* accel_ioctl_inhibit_begin: start critical section
*
* This function makes sure that:
* 1) incoming accel_{cpu_}ioctl_begin() calls block
* 2) wait that all ioctls that were already running reach
* accel_{cpu_}ioctl_end(), kicking vcpus if necessary.
*
* This allows the caller to access shared data or perform operations without
* worrying of concurrent vcpus accesses.
*/
void accel_ioctl_inhibit_begin(void);
/*
* accel_ioctl_inhibit_end: end critical section started by
* accel_ioctl_inhibit_begin()
*
* This function allows blocked accel_{cpu_}ioctl_begin() to continue.
*/
void accel_ioctl_inhibit_end(void);
#endif /* ACCEL_BLOCKER_H */
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