1/* 2 * CPU timers state API 3 * 4 * Copyright 2020 SUSE LLC 5 * 6 * This work is licensed under the terms of the GNU GPL, version 2 or later. 7 * See the COPYING file in the top-level directory. 8 * 9 */ 10#ifndef SYSEMU_CPU_TIMERS_H 11#define SYSEMU_CPU_TIMERS_H 12 13#include "qemu/timer.h" 14 15/* init the whole cpu timers API, including icount, ticks, and cpu_throttle */ 16void cpu_timers_init(void); 17 18/* icount - Instruction Counter API */ 19 20/* 21 * icount enablement state: 22 * 23 * 0 = Disabled - Do not count executed instructions. 24 * 1 = Enabled - Fixed conversion of insn to ns via "shift" option 25 * 2 = Enabled - Runtime adaptive algorithm to compute shift 26 */ 27#ifdef CONFIG_TCG 28extern int use_icount; 29#define icount_enabled() (use_icount) 30#else 31#define icount_enabled() 0 32#endif 33 34/* 35 * Update the icount with the executed instructions. Called by 36 * cpus-tcg vCPU thread so the main-loop can see time has moved forward. 37 */ 38void icount_update(CPUState *cpu); 39 40/* get raw icount value */ 41int64_t icount_get_raw(void); 42 43/* return the virtual CPU time in ns, based on the instruction counter. */ 44int64_t icount_get(void); 45/* 46 * convert an instruction counter value to ns, based on the icount shift. 47 * This shift is set as a fixed value with the icount "shift" option 48 * (precise mode), or it is constantly approximated and corrected at 49 * runtime in adaptive mode. 50 */ 51int64_t icount_to_ns(int64_t icount); 52 53/* configure the icount options, including "shift" */ 54void icount_configure(QemuOpts *opts, Error **errp); 55 56/* used by tcg vcpu thread to calc icount budget */ 57int64_t icount_round(int64_t count); 58 59/* if the CPUs are idle, start accounting real time to virtual clock. */ 60void icount_start_warp_timer(void); 61void icount_account_warp_timer(void); 62void icount_notify_exit(void); 63 64/* 65 * CPU Ticks and Clock 66 */ 67 68/* Caller must hold BQL */ 69void cpu_enable_ticks(void); 70/* Caller must hold BQL */ 71void cpu_disable_ticks(void); 72 73/* 74 * return the time elapsed in VM between vm_start and vm_stop. 75 * cpu_get_ticks() uses units of the host CPU cycle counter. 76 */ 77int64_t cpu_get_ticks(void); 78 79/* 80 * Returns the monotonic time elapsed in VM, i.e., 81 * the time between vm_start and vm_stop 82 */ 83int64_t cpu_get_clock(void); 84 85void qemu_timer_notify_cb(void *opaque, QEMUClockType type); 86 87/* get the VIRTUAL clock and VM elapsed ticks via the cpus accel interface */ 88int64_t cpus_get_virtual_clock(void); 89int64_t cpus_get_elapsed_ticks(void); 90 91#endif /* SYSEMU_CPU_TIMERS_H */ 92