740b175973
refactoring of cpus.c continues with cpu timer state extraction.
cpu-timers: responsible for the softmmu cpu timers state,
including cpu clocks and ticks.
icount: counts the TCG instructions executed. As such it is specific to
the TCG accelerator. Therefore, it is built only under CONFIG_TCG.
One complication is due to qtest, which uses an icount field to warp time
as part of qtest (qtest_clock_warp).
In order to solve this problem, provide a separate counter for qtest.
This requires fixing assumptions scattered in the code that
qtest_enabled() implies icount_enabled(), checking each specific case.
Signed-off-by: Claudio Fontana <cfontana@suse.de>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
[remove redundant initialization with qemu_spice_init]
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
[fix lingering calls to icount_get]
Signed-off-by: Claudio Fontana <cfontana@suse.de>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
88 lines
2.3 KiB
C
88 lines
2.3 KiB
C
/*
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* CPU timers state API
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*
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* Copyright 2020 SUSE LLC
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*
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*/
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#ifndef SYSEMU_CPU_TIMERS_H
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#define SYSEMU_CPU_TIMERS_H
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#include "qemu/timer.h"
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/* init the whole cpu timers API, including icount, ticks, and cpu_throttle */
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void cpu_timers_init(void);
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/* icount - Instruction Counter API */
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/*
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* icount enablement state:
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*
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* 0 = Disabled - Do not count executed instructions.
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* 1 = Enabled - Fixed conversion of insn to ns via "shift" option
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* 2 = Enabled - Runtime adaptive algorithm to compute shift
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*/
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#ifdef CONFIG_TCG
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extern int use_icount;
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#define icount_enabled() (use_icount)
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#else
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#define icount_enabled() 0
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#endif
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/*
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* Update the icount with the executed instructions. Called by
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* cpus-tcg vCPU thread so the main-loop can see time has moved forward.
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*/
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void cpu_update_icount(CPUState *cpu);
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/* get raw icount value */
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int64_t cpu_get_icount_raw(void);
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/* return the virtual CPU time in ns, based on the instruction counter. */
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int64_t cpu_get_icount(void);
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/*
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* convert an instruction counter value to ns, based on the icount shift.
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* This shift is set as a fixed value with the icount "shift" option
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* (precise mode), or it is constantly approximated and corrected at
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* runtime in adaptive mode.
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*/
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int64_t cpu_icount_to_ns(int64_t icount);
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/* configure the icount options, including "shift" */
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void configure_icount(QemuOpts *opts, Error **errp);
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/* used by tcg vcpu thread to calc icount budget */
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int64_t qemu_icount_round(int64_t count);
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/* if the CPUs are idle, start accounting real time to virtual clock. */
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void qemu_start_warp_timer(void);
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void qemu_account_warp_timer(void);
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/*
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* CPU Ticks and Clock
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*/
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/* Caller must hold BQL */
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void cpu_enable_ticks(void);
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/* Caller must hold BQL */
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void cpu_disable_ticks(void);
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/*
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* return the time elapsed in VM between vm_start and vm_stop. Unless
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* icount is active, cpu_get_ticks() uses units of the host CPU cycle
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* counter.
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*/
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int64_t cpu_get_ticks(void);
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/*
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* Returns the monotonic time elapsed in VM, i.e.,
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* the time between vm_start and vm_stop
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*/
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int64_t cpu_get_clock(void);
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void qemu_timer_notify_cb(void *opaque, QEMUClockType type);
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#endif /* SYSEMU_CPU_TIMERS_H */
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