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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 */
16 void 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
28 extern 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 */
38 void icount_update(CPUState *cpu);
39
40 /* get raw icount value */
41 int64_t icount_get_raw(void);
42
43 /* return the virtual CPU time in ns, based on the instruction counter. */
44 int64_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 */
51 int64_t icount_to_ns(int64_t icount);
52
53 /* configure the icount options, including "shift" */
54 void icount_configure(QemuOpts *opts, Error **errp);
55
56 /* used by tcg vcpu thread to calc icount budget */
57 int64_t icount_round(int64_t count);
58
59 /* if the CPUs are idle, start accounting real time to virtual clock. */
60 void icount_start_warp_timer(void);
61 void icount_account_warp_timer(void);
62 void icount_notify_exit(void);
63
64 /*
65 * CPU Ticks and Clock
66 */
67
68 /* Caller must hold BQL */
69 void cpu_enable_ticks(void);
70 /* Caller must hold BQL */
71 void 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 */
77 int64_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 */
83 int64_t cpu_get_clock(void);
84
85 void qemu_timer_notify_cb(void *opaque, QEMUClockType type);
86
87 /* get the VIRTUAL clock and VM elapsed ticks via the cpus accel interface */
88 int64_t cpus_get_virtual_clock(void);
89 int64_t cpus_get_elapsed_ticks(void);
90
91 #endif /* SYSEMU_CPU_TIMERS_H */