mirror of https://gitlab.com/qemu-project/qemu
You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
77 lines
2.1 KiB
C
77 lines
2.1 KiB
C
/*
|
|
* icount - Instruction Counter API
|
|
* CPU timers state API
|
|
*
|
|
* Copyright 2020 SUSE LLC
|
|
* SPDX-License-Identifier: GPL-2.0-or-later
|
|
*/
|
|
|
|
#ifndef EXEC_ICOUNT_H
|
|
#define EXEC_ICOUNT_H
|
|
|
|
/**
|
|
* ICountMode: icount enablement state:
|
|
*
|
|
* @ICOUNT_DISABLED: Disabled - Do not count executed instructions.
|
|
* @ICOUNT_PRECISE: Enabled - Fixed conversion of insn to ns via "shift" option
|
|
* @ICOUNT_ADAPTATIVE: Enabled - Runtime adaptive algorithm to compute shift
|
|
*/
|
|
typedef enum {
|
|
ICOUNT_DISABLED = 0,
|
|
ICOUNT_PRECISE,
|
|
ICOUNT_ADAPTATIVE,
|
|
} ICountMode;
|
|
|
|
#ifdef CONFIG_TCG
|
|
extern ICountMode use_icount;
|
|
#define icount_enabled() (use_icount)
|
|
#else
|
|
#define icount_enabled() ICOUNT_DISABLED
|
|
#endif
|
|
|
|
/* Protect the CONFIG_USER_ONLY test vs poisoning. */
|
|
#if defined(COMPILING_PER_TARGET) || defined(COMPILING_SYSTEM_VS_USER)
|
|
# ifdef CONFIG_USER_ONLY
|
|
# undef icount_enabled
|
|
# define icount_enabled() ICOUNT_DISABLED
|
|
# endif
|
|
#endif
|
|
|
|
/*
|
|
* Update the icount with the executed instructions. Called by
|
|
* cpus-tcg vCPU thread so the main-loop can see time has moved forward.
|
|
*/
|
|
void icount_update(CPUState *cpu);
|
|
|
|
/* get raw icount value */
|
|
int64_t icount_get_raw(void);
|
|
|
|
/* return the virtual CPU time in ns, based on the instruction counter. */
|
|
int64_t icount_get(void);
|
|
/*
|
|
* convert an instruction counter value to ns, based on the icount shift.
|
|
* This shift is set as a fixed value with the icount "shift" option
|
|
* (precise mode), or it is constantly approximated and corrected at
|
|
* runtime in adaptive mode.
|
|
*/
|
|
int64_t icount_to_ns(int64_t icount);
|
|
|
|
/**
|
|
* icount_configure: configure the icount options, including "shift"
|
|
* @opts: Options to parse
|
|
* @errp: pointer to a NULL-initialized error object
|
|
*
|
|
* Return: true on success, else false setting @errp with error
|
|
*/
|
|
bool icount_configure(QemuOpts *opts, Error **errp);
|
|
|
|
/* used by tcg vcpu thread to calc icount budget */
|
|
int64_t icount_round(int64_t count);
|
|
|
|
/* if the CPUs are idle, start accounting real time to virtual clock. */
|
|
void icount_start_warp_timer(void);
|
|
void icount_account_warp_timer(void);
|
|
void icount_notify_exit(void);
|
|
|
|
#endif /* EXEC_ICOUNT_H */
|