diff options
| -rw-r--r-- | Makefile.target | 2 | ||||
| -rw-r--r-- | cpu-all.h | 2 | ||||
| -rw-r--r-- | cutils.c | 18 | ||||
| -rw-r--r-- | qemu-common.h | 1 | ||||
| -rw-r--r-- | qemu-timer.c | 1203 | ||||
| -rw-r--r-- | qemu-timer.h | 12 | ||||
| -rw-r--r-- | vl.c | 1166 |
7 files changed, 1237 insertions, 1167 deletions
diff --git a/Makefile.target b/Makefile.target index 56c6652315..0c282154d5 100644 --- a/Makefile.target +++ b/Makefile.target @@ -172,7 +172,7 @@ endif #CONFIG_BSD_USER ifdef CONFIG_SOFTMMU obj-y = vl.o async.o monitor.o pci.o pci_host.o pcie_host.o machine.o gdbstub.o -obj-y += qemu-error.o +obj-y += qemu-error.o qemu-timer.o # virtio has to be here due to weird dependency between PCI and virtio-net. # need to fix this properly obj-y += virtio-blk.o virtio-balloon.o virtio-net.o virtio-pci.o virtio-serial-bus.o @@ -771,6 +771,8 @@ void QEMU_NORETURN cpu_abort(CPUState *env, const char *fmt, ...) __attribute__ ((__format__ (__printf__, 2, 3))); extern CPUState *first_cpu; extern CPUState *cpu_single_env; + +int64_t qemu_icount_round(int64_t count); extern int64_t qemu_icount; extern int use_icount; @@ -233,3 +233,21 @@ void qemu_iovec_from_buffer(QEMUIOVector *qiov, const void *buf, size_t count) count -= copy; } } + +#ifndef _WIN32 +/* Sets a specific flag */ +int fcntl_setfl(int fd, int flag) +{ + int flags; + + flags = fcntl(fd, F_GETFL); + if (flags == -1) + return -errno; + + if (fcntl(fd, F_SETFL, flags | flag) == -1) + return -errno; + + return 0; +} +#endif + diff --git a/qemu-common.h b/qemu-common.h index 805be1a8cc..63aab46752 100644 --- a/qemu-common.h +++ b/qemu-common.h @@ -132,6 +132,7 @@ int qemu_strnlen(const char *s, int max_len); time_t mktimegm(struct tm *tm); int qemu_fls(int i); int qemu_fdatasync(int fd); +int fcntl_setfl(int fd, int flag); /* path.c */ void init_paths(const char *prefix); diff --git a/qemu-timer.c b/qemu-timer.c new file mode 100644 index 0000000000..329d3a4e60 --- /dev/null +++ b/qemu-timer.c @@ -0,0 +1,1203 @@ +/* + * QEMU System Emulator + * + * Copyright (c) 2003-2008 Fabrice Bellard + * + * Permission is hereby granted, free of charge, to any person obtaining a copy + * of this software and associated documentation files (the "Software"), to deal + * in the Software without restriction, including without limitation the rights + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell + * copies of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN + * THE SOFTWARE. + */ + +#include "sysemu.h" +#include "net.h" +#include "monitor.h" +#include "console.h" + +#include "hw/hw.h" + +#include <unistd.h> +#include <fcntl.h> +#include <time.h> +#include <errno.h> +#include <sys/time.h> +#include <signal.h> + +#ifdef __linux__ +#include <sys/ioctl.h> +#include <linux/rtc.h> +/* For the benefit of older linux systems which don't supply it, + we use a local copy of hpet.h. */ +/* #include <linux/hpet.h> */ +#include "hpet.h" +#endif + +#ifdef _WIN32 +#include <windows.h> +#include <mmsystem.h> +#endif + +#include "cpu-defs.h" +#include "qemu-timer.h" +#include "exec-all.h" + +/* Conversion factor from emulated instructions to virtual clock ticks. */ +static int icount_time_shift; +/* Arbitrarily pick 1MIPS as the minimum allowable speed. */ +#define MAX_ICOUNT_SHIFT 10 +/* Compensate for varying guest execution speed. */ +static int64_t qemu_icount_bias; +static QEMUTimer *icount_rt_timer; +static QEMUTimer *icount_vm_timer; + + +/***********************************************************/ +/* real time host monotonic timer */ + + +static int64_t get_clock_realtime(void) +{ + struct timeval tv; + + gettimeofday(&tv, NULL); + return tv.tv_sec * 1000000000LL + (tv.tv_usec * 1000); +} + +#ifdef WIN32 + +static int64_t clock_freq; + +static void init_get_clock(void) +{ + LARGE_INTEGER freq; + int ret; + ret = QueryPerformanceFrequency(&freq); + if (ret == 0) { + fprintf(stderr, "Could not calibrate ticks\n"); + exit(1); + } + clock_freq = freq.QuadPart; +} + +static int64_t get_clock(void) +{ + LARGE_INTEGER ti; + QueryPerformanceCounter(&ti); + return muldiv64(ti.QuadPart, get_ticks_per_sec(), clock_freq); +} + +#else + +static int use_rt_clock; + +static void init_get_clock(void) +{ + use_rt_clock = 0; +#if defined(__linux__) || (defined(__FreeBSD__) && __FreeBSD_version >= 500000) \ + || defined(__DragonFly__) || defined(__FreeBSD_kernel__) + { + struct timespec ts; + if (clock_gettime(CLOCK_MONOTONIC, &ts) == 0) { + use_rt_clock = 1; + } + } +#endif +} + +static int64_t get_clock(void) +{ +#if defined(__linux__) || (defined(__FreeBSD__) && __FreeBSD_version >= 500000) \ + || defined(__DragonFly__) || defined(__FreeBSD_kernel__) + if (use_rt_clock) { + struct timespec ts; + clock_gettime(CLOCK_MONOTONIC, &ts); + return ts.tv_sec * 1000000000LL + ts.tv_nsec; + } else +#endif + { + /* XXX: using gettimeofday leads to problems if the date + changes, so it should be avoided. */ + return get_clock_realtime(); + } +} +#endif + +/* Return the virtual CPU time, based on the instruction counter. */ +static int64_t cpu_get_icount(void) +{ + int64_t icount; + CPUState *env = cpu_single_env;; + icount = qemu_icount; + if (env) { + if (!can_do_io(env)) + fprintf(stderr, "Bad clock read\n"); + icount -= (env->icount_decr.u16.low + env->icount_extra); + } + return qemu_icount_bias + (icount << icount_time_shift); +} + +/***********************************************************/ +/* guest cycle counter */ + +typedef struct TimersState { + int64_t cpu_ticks_prev; + int64_t cpu_ticks_offset; + int64_t cpu_clock_offset; + int32_t cpu_ticks_enabled; + int64_t dummy; +} TimersState; + +TimersState timers_state; + +/* return the host CPU cycle counter and handle stop/restart */ +int64_t cpu_get_ticks(void) +{ + if (use_icount) { + return cpu_get_icount(); + } + if (!timers_state.cpu_ticks_enabled) { + return timers_state.cpu_ticks_offset; + } else { + int64_t ticks; + ticks = cpu_get_real_ticks(); + if (timers_state.cpu_ticks_prev > ticks) { + /* Note: non increasing ticks may happen if the host uses + software suspend */ + timers_state.cpu_ticks_offset += timers_state.cpu_ticks_prev - ticks; + } + timers_state.cpu_ticks_prev = ticks; + return ticks + timers_state.cpu_ticks_offset; + } +} + +/* return the host CPU monotonic timer and handle stop/restart */ +static int64_t cpu_get_clock(void) +{ + int64_t ti; + if (!timers_state.cpu_ticks_enabled) { + return timers_state.cpu_clock_offset; + } else { + ti = get_clock(); + return ti + timers_state.cpu_clock_offset; + } +} + +#ifndef CONFIG_IOTHREAD +static int64_t qemu_icount_delta(void) +{ + if (!use_icount) { + return 5000 * (int64_t) 1000000; + } else if (use_icount == 1) { + /* When not using an adaptive execution frequency + we tend to get badly out of sync with real time, + so just delay for a reasonable amount of time. */ + return 0; + } else { + return cpu_get_icount() - cpu_get_clock(); + } +} +#endif + +/* enable cpu_get_ticks() */ +void cpu_enable_ticks(void) +{ + if (!timers_state.cpu_ticks_enabled) { + timers_state.cpu_ticks_offset -= cpu_get_real_ticks(); + timers_state.cpu_clock_offset -= get_clock(); + timers_state.cpu_ticks_enabled = 1; + } +} + +/* disable cpu_get_ticks() : the clock is stopped. You must not call + cpu_get_ticks() after that. */ +void cpu_disable_ticks(void) +{ + if (timers_state.cpu_ticks_enabled) { + timers_state.cpu_ticks_offset = cpu_get_ticks(); + timers_state.cpu_clock_offset = cpu_get_clock(); + timers_state.cpu_ticks_enabled = 0; + } +} + +/***********************************************************/ +/* timers */ + +#define QEMU_CLOCK_REALTIME 0 +#define QEMU_CLOCK_VIRTUAL 1 +#define QEMU_CLOCK_HOST 2 + +struct QEMUClock { + int type; + int enabled; + /* XXX: add frequency */ +}; + +struct QEMUTimer { + QEMUClock *clock; + int64_t expire_time; + QEMUTimerCB *cb; + void *opaque; + struct QEMUTimer *next; +}; + +struct qemu_alarm_timer { + char const *name; + int (*start)(struct qemu_alarm_timer *t); + void (*stop)(struct qemu_alarm_timer *t); + void (*rearm)(struct qemu_alarm_timer *t); + void *priv; + + char expired; + char pending; +}; + +static struct qemu_alarm_timer *alarm_timer; + +int qemu_alarm_pending(void) +{ + return alarm_timer->pending; +} + +static inline int alarm_has_dynticks(struct qemu_alarm_timer *t) +{ + return !!t->rearm; +} + +static void qemu_rearm_alarm_timer(struct qemu_alarm_timer *t) +{ + if (!alarm_has_dynticks(t)) + return; + + t->rearm(t); +} + +/* TODO: MIN_TIMER_REARM_US should be optimized */ +#define MIN_TIMER_REARM_US 250 + +#ifdef _WIN32 + +struct qemu_alarm_win32 { + MMRESULT timerId; + unsigned int period; +} alarm_win32_data = {0, 0}; + +static int win32_start_timer(struct qemu_alarm_timer *t); +static void win32_stop_timer(struct qemu_alarm_timer *t); +static void win32_rearm_timer(struct qemu_alarm_timer *t); + +#else + +static int unix_start_timer(struct qemu_alarm_timer *t); +static void unix_stop_timer(struct qemu_alarm_timer *t); + +#ifdef __linux__ + +static int dynticks_start_timer(struct qemu_alarm_timer *t); +static void dynticks_stop_timer(struct qemu_alarm_timer *t); +static void dynticks_rearm_timer(struct qemu_alarm_timer *t); + +static int hpet_start_timer(struct qemu_alarm_timer *t); +static void hpet_stop_timer(struct qemu_alarm_timer *t); + +static int rtc_start_timer(struct qemu_alarm_timer *t); +static void rtc_stop_timer(struct qemu_alarm_timer *t); + +#endif /* __linux__ */ + +#endif /* _WIN32 */ + +/* Correlation between real and virtual time is always going to be + fairly approximate, so ignore small variation. + When the guest is idle real and virtual time will be aligned in + the IO wait loop. */ +#define ICOUNT_WOBBLE (get_ticks_per_sec() / 10) + +static void icount_adjust(void) +{ + int64_t cur_time; + int64_t cur_icount; + int64_t delta; + static int64_t last_delta; + /* If the VM is not running, then do nothing. */ + if (!vm_running) + return; + + cur_time = cpu_get_clock(); + cur_icount = qemu_get_clock(vm_clock); + delta = cur_icount - cur_time; + /* FIXME: This is a very crude algorithm, somewhat prone to oscillation. */ + if (delta > 0 + && last_delta + ICOUNT_WOBBLE < delta * 2 + && icount_time_shift > 0) { + /* The guest is getting too far ahead. Slow time down. */ + icount_time_shift--; + } + if (delta < 0 + && last_delta - ICOUNT_WOBBLE > delta * 2 + && icount_time_shift < MAX_ICOUNT_SHIFT) { + /* The guest is getting too far behind. Speed time up. */ + icount_time_shift++; + } + last_delta = delta; + qemu_icount_bias = cur_icount - (qemu_icount << icount_time_shift); +} + +static void icount_adjust_rt(void * opaque) +{ + qemu_mod_timer(icount_rt_timer, + qemu_get_clock(rt_clock) + 1000); + icount_adjust(); +} + +static void icount_adjust_vm(void * opaque) +{ + qemu_mod_timer(icount_vm_timer, + qemu_get_clock(vm_clock) + get_ticks_per_sec() / 10); + icount_adjust(); +} + +int64_t qemu_icount_round(int64_t count) +{ + return (count + (1 << icount_time_shift) - 1) >> icount_time_shift; +} + +static struct qemu_alarm_timer alarm_timers[] = { +#ifndef _WIN32 +#ifdef __linux__ + {"dynticks", dynticks_start_timer, + dynticks_stop_timer, dynticks_rearm_timer, NULL}, + /* HPET - if available - is preferred */ + {"hpet", hpet_start_timer, hpet_stop_timer, NULL, NULL}, + /* ...otherwise try RTC */ + {"rtc", rtc_start_timer, rtc_stop_timer, NULL, NULL}, +#endif + {"unix", unix_start_timer, unix_stop_timer, NULL, NULL}, +#else + {"dynticks", win32_start_timer, + win32_stop_timer, win32_rearm_timer, &alarm_win32_data}, + {"win32", win32_start_timer, + win32_stop_timer, NULL, &alarm_win32_data}, +#endif + {NULL, } +}; + +static void show_available_alarms(void) +{ + int i; + + printf("Available alarm timers, in order of precedence:\n"); + for (i = 0; alarm_timers[i].name; i++) + printf("%s\n", alarm_timers[i].name); +} + +void configure_alarms(char const *opt) +{ + int i; + int cur = 0; + int count = ARRAY_SIZE(alarm_timers) - 1; + char *arg; + char *name; + struct qemu_alarm_timer tmp; + + if (!strcmp(opt, "?")) { + show_available_alarms(); + exit(0); + } + + arg = qemu_strdup(opt); + + /* Reorder the array */ + name = strtok(arg, ","); + while (name) { + for (i = 0; i < count && alarm_timers[i].name; i++) { + if (!strcmp(alarm_timers[i].name, name)) + break; + } + + if (i == count) { + fprintf(stderr, "Unknown clock %s\n", name); + goto next; + } + + if (i < cur) + /* Ignore */ + goto next; + + /* Swap */ + tmp = alarm_timers[i]; + alarm_timers[i] = alarm_timers[cur]; + alarm_timers[cur] = tmp; + + cur++; +next: + name = strtok(NULL, ","); + } + + qemu_free(arg); + + if (cur) { + /* Disable remaining timers */ + for (i = cur; i < count; i++) + alarm_timers[i].name = NULL; + } else { + show_available_alarms(); + exit(1); + } +} + +#define QEMU_NUM_CLOCKS 3 + +QEMUClock *rt_clock; +QEMUClock *vm_clock; +QEMUClock *host_clock; + +static QEMUTimer *active_timers[QEMU_NUM_CLOCKS]; + +static QEMUClock *qemu_new_clock(int type) +{ + QEMUClock *clock; + clock = qemu_mallocz(sizeof(QEMUClock)); + clock->type = type; + clock->enabled = 1; + return clock; +} + +void qemu_clock_enable(QEMUClock *clock, int enabled) +{ + clock->enabled = enabled; +} + +QEMUTimer *qemu_new_timer(QEMUClock *clock, QEMUTimerCB *cb, void *opaque) +{ + QEMUTimer *ts; + + ts = qemu_mallocz(sizeof(QEMUTimer)); + ts->clock = clock; + ts->cb = cb; + ts->opaque = opaque; + return ts; +} + +void qemu_free_timer(QEMUTimer *ts) +{ + qemu_free(ts); +} + +/* stop a timer, but do not dealloc it */ +void qemu_del_timer(QEMUTimer *ts) +{ + QEMUTimer **pt, *t; + + /* NOTE: this code must be signal safe because + qemu_timer_expired() can be called from a signal. */ + pt = &active_timers[ts->clock->type]; + for(;;) { + t = *pt; + if (!t) + break; + if (t == ts) { + *pt = t->next; + break; + } + pt = &t->next; + } +} + +/* modify the current timer so that it will be fired when current_time + >= expire_time. The corresponding callback will be called. */ +void qemu_mod_timer(QEMUTimer *ts, int64_t expire_time) +{ + QEMUTimer **pt, *t; + + qemu_del_timer(ts); + + /* add the timer in the sorted list */ + /* NOTE: this code must be signal safe because + qemu_timer_expired() can be called from a signal. */ + pt = &active_timers[ts->clock->type]; + for(;;) { + t = *pt; + if (!t) + break; + if (t->expire_time > expire_time) + break; + pt = &t->next; + } + ts->expire_time = expire_time; + ts->next = *pt; + *pt = ts; + + /* Rearm if necessary */ + if (pt == &active_timers[ts->clock->type]) { + if (!alarm_timer->pending) { + qemu_rearm_alarm_timer(alarm_timer); + } + /* Interrupt execution to force deadline recalculation. */ + if (use_icount) + qemu_notify_event(); + } +} + +int qemu_timer_pending(QEMUTimer *ts) +{ + QEMUTimer *t; + for(t = active_timers[ts->clock->type]; t != NULL; t = t->next) { + if (t == ts) + return 1; + } + return 0; +} + +int qemu_timer_expired(QEMUTimer *timer_head, int64_t current_time) +{ + if (!timer_head) + return 0; + return (timer_head->expire_time <= current_time); +} + +static void qemu_run_timers(QEMUClock *clock) +{ + QEMUTimer **ptimer_head, *ts; + int64_t current_time; + + if (!clock->enabled) + return; + + current_time = qemu_get_clock (clock); + ptimer_head = &active_timers[clock->type]; + for(;;) { + ts = *ptimer_head; + if (!ts || ts->expire_time > current_time) + break; + /* remove timer from the list before calling the callback */ + *ptimer_head = ts->next; + ts->next = NULL; + + /* run the callback (the timer list can be modified) */ + ts->cb(ts->opaque); + } +} + +int64_t qemu_get_clock(QEMUClock *clock) +{ + switch(clock->type) { + case QEMU_CLOCK_REALTIME: + return get_clock() / 1000000; + default: + case QEMU_CLOCK_VIRTUAL: + if (use_icount) { + return cpu_get_icount(); + } else { + return cpu_get_clock(); + } + case QEMU_CLOCK_HOST: + return get_clock_realtime(); + } +} + +int64_t qemu_get_clock_ns(QEMUClock *clock) +{ + switch(clock->type) { + case QEMU_CLOCK_REALTIME: + return get_clock(); + default: + case QEMU_CLOCK_VIRTUAL: + if (use_icount) { + return cpu_get_icount(); + } else { + return cpu_get_clock(); + } + case QEMU_CLOCK_HOST: + return get_clock_realtime(); + } +} + +void init_clocks(void) +{ + init_get_clock(); + rt_clock = qemu_new_clock(QEMU_CLOCK_REALTIME); + vm_clock = qemu_new_clock(QEMU_CLOCK_VIRTUAL); + host_clock = qemu_new_clock(QEMU_CLOCK_HOST); + + rtc_clock = host_clock; +} + +/* save a timer */ +void qemu_put_timer(QEMUFile *f, QEMUTimer *ts) +{ + uint64_t expire_time; + + if (qemu_timer_pending(ts)) { + expire_time = ts->expire_time; + } else { + expire_time = -1; + } + qemu_put_be64(f, expire_time); +} + +void qemu_get_timer(QEMUFile *f, QEMUTimer *ts) +{ + uint64_t expire_time; + + expire_time = qemu_get_be64(f); + if (expire_time != -1) { + qemu_mod_timer(ts, expire_time); + } else { + qemu_del_timer(ts); + } +} + +static const VMStateDescription vmstate_timers = { + .name = "timer", + .version_id = 2, + .minimum_version_id = 1, + .minimum_version_id_old = 1, + .fields = (VMStateField []) { + VMSTATE_INT64(cpu_ticks_offset, TimersState), + VMSTATE_INT64(dummy, TimersState), + VMSTATE_INT64_V(cpu_clock_offset, TimersState, 2), + VMSTATE_END_OF_LIST() + } +}; + +void configure_icount(const char *option) +{ + vmstate_register(0, &vmstate_timers, &timers_state); + if (!option) + return; + + if (strcmp(option, "auto") != 0) { + icount_time_shift = strtol(option, NULL, 0); + use_icount = 1; + return; + } + + use_icount = 2; + + /* 125MIPS seems a reasonable initial guess at the guest speed. + It will be corrected fairly quickly anyway. */ + icount_time_shift = 3; + + /* Have both realtime and virtual time triggers for speed adjustment. + The realtime trigger catches emulated time passing too slowly, + the virtual time trigger catches emulated time passing too fast. + Realtime triggers occur even when idle, so use them less frequently + than VM triggers. */ + icount_rt_timer = qemu_new_timer(rt_clock, icount_adjust_rt, NULL); + qemu_mod_timer(icount_rt_timer, + qemu_get_clock(rt_clock) + 1000); + icount_vm_timer = qemu_new_timer(vm_clock, icount_adjust_vm, NULL); + qemu_mod_timer(icount_vm_timer, + qemu_get_clock(vm_clock) + get_ticks_per_sec() / 10); +} + +void qemu_run_all_timers(void) +{ + /* rearm timer, if not periodic */ + if (alarm_timer->expired) { + alarm_timer->expired = 0; + qemu_rearm_alarm_timer(alarm_timer); + } + + alarm_timer->pending = 0; + + /* vm time timers */ + if (vm_running) { + qemu_run_timers(vm_clock); + } + + qemu_run_timers(rt_clock); + qemu_run_timers(host_clock); +} + +#ifdef _WIN32 +static void CALLBACK host_alarm_handler(UINT uTimerID, UINT uMsg, + DWORD_PTR dwUser, DWORD_PTR dw1, + DWORD_PTR dw2) +#else +static void host_alarm_handler(int host_signum) +#endif +{ + struct qemu_alarm_timer *t = alarm_timer; + if (!t) + return; + +#if 0 +#define DISP_FREQ 1000 + { + static int64_t delta_min = INT64_MAX; + static int64_t delta_max, delta_cum, last_clock, delta, ti; + static int count; + ti = qemu_get_clock(vm_clock); + if (last_clock != 0) { + delta = ti - last_clock; + if (delta < delta_min) + delta_min = delta; + if (delta > delta_max) + delta_max = delta; + delta_cum += delta; + if (++count == DISP_FREQ) { + printf("timer: min=%" PRId64 " us max=%" PRId64 " us avg=%" PRId64 " us avg_freq=%0.3f Hz\n", + muldiv64(delta_min, 1000000, get_ticks_per_sec()), + muldiv64(delta_max, 1000000, get_ticks_per_sec()), + muldiv64(delta_cum, 1000000 / DISP_FREQ, get_ticks_per_sec()), + (double)get_ticks_per_sec() / ((double)delta_cum / DISP_FREQ)); + count = 0; + delta_min = INT64_MAX; + delta_max = 0; + delta_cum = 0; + } + } + last_clock = ti; + } +#endif + if (alarm_has_dynticks(t) || + (!use_icount && + qemu_timer_expired(active_timers[QEMU_CLOCK_VIRTUAL], + qemu_get_clock(vm_clock))) || + qemu_timer_expired(active_timers[QEMU_CLOCK_REALTIME], + qemu_get_clock(rt_clock)) || + qemu_timer_expired(active_timers[QEMU_CLOCK_HOST], + qemu_get_clock(host_clock))) { + + t->expired = alarm_has_dynticks(t); + t->pending = 1; + qemu_notify_event(); + } +} + +int64_t qemu_next_deadline(void) +{ + /* To avoid problems with overflow limit this to 2^32. */ + int64_t delta = INT32_MAX; + + if (active_timers[QEMU_CLOCK_VIRTUAL]) { + delta = active_timers[QEMU_CLOCK_VIRTUAL]->expire_time - + qemu_get_clock(vm_clock); + } + if (active_timers[QEMU_CLOCK_HOST]) { + int64_t hdelta = active_timers[QEMU_CLOCK_HOST]->expire_time - + qemu_get_clock(host_clock); + if (hdelta < delta) + delta = hdelta; + } + + if (delta < 0) + delta = 0; + + return delta; +} + +#ifndef _WIN32 + +#if defined(__linux__) + +#define RTC_FREQ 1024 + +static uint64_t qemu_next_deadline_dyntick(void) +{ + int64_t delta; + int64_t rtdelta; + + if (use_icount) + delta = INT32_MAX; + else + delta = (qemu_next_deadline() + 999) / 1000; + + if (active_timers[QEMU_CLOCK_REALTIME]) { + rtdelta = (active_timers[QEMU_CLOCK_REALTIME]->expire_time - + qemu_get_clock(rt_clock))*1000; + if (rtdelta < delta) + delta = rtdelta; + } + + if (delta < MIN_TIMER_REARM_US) + delta = MIN_TIMER_REARM_US; + + return delta; +} + +static void enable_sigio_timer(int fd) +{ + struct sigaction act; + + /* timer signal */ + sigfillset(&act.sa_mask); + act.sa_flags = 0; + act.sa_handler = host_alarm_handler; + + sigaction(SIGIO, &act, NULL); + fcntl_setfl(fd, O_ASYNC); + fcntl(fd, F_SETOWN, getpid()); +} + +static int hpet_start_timer(struct qemu_alarm_timer *t) +{ + struct hpet_info info; + int r, fd; + + fd = qemu_open("/dev/hpet", O_RDONLY); + if (fd < 0) + return -1; + + /* Set frequency */ + r = ioctl(fd, HPET_IRQFREQ, RTC_FREQ); + if (r < 0) { + fprintf(stderr, "Could not configure '/dev/hpet' to have a 1024Hz timer. This is not a fatal\n" + "error, but for better emulation accuracy type:\n" + "'echo 1024 > /proc/sys/dev/hpet/max-user-freq' as root.\n"); + goto fail; + } + + /* Check capabilities */ + r = ioctl(fd, HPET_INFO, &info); + if (r < 0) + goto fail; + + /* Enable periodic mode */ + r = ioctl(fd, HPET_EPI, 0); + if (info.hi_flags && (r < 0)) + goto fail; + + /* Enable interrupt */ + r = ioctl(fd, HPET_IE_ON, 0); + if (r < 0) + goto fail; + + enable_sigio_timer(fd); + t->priv = (void *)(long)fd; + + return 0; +fail: + close(fd); + return -1; +} + +static void hpet_stop_timer(struct qemu_alarm_timer *t) +{ + int fd = (long)t->priv; + + close(fd); +} + +static int rtc_start_timer(struct qemu_alarm_timer *t) +{ + int rtc_fd; + unsigned long current_rtc_freq = 0; + + TFR(rtc_fd = qemu_open("/dev/rtc", O_RDONLY)); + if (rtc_fd < 0) + return -1; + ioctl(rtc_fd, RTC_IRQP_READ, ¤t_rtc_freq); + if (current_rtc_freq != RTC_FREQ && + ioctl(rtc_fd, RTC_IRQP_SET, RTC_FREQ) < 0) { + fprintf(stderr, "Could not configure '/dev/rtc' to have a 1024 Hz timer. This is not a fatal\n" + "error, but for better emulation accuracy either use a 2.6 host Linux kernel or\n" + "type 'echo 1024 > /proc/sys/dev/rtc/max-user-freq' as root.\n"); + goto fail; + } + if (ioctl(rtc_fd, RTC_PIE_ON, 0) < 0) { + fail: + close(rtc_fd); + return -1; + } + + enable_sigio_timer(rtc_fd); + + t->priv = (void *)(long)rtc_fd; + + return 0; +} + +static void rtc_stop_timer(struct qemu_alarm_timer *t) +{ + int rtc_fd = (long)t->priv; + + close(rtc_fd); +} + +static int dynticks_start_timer(struct qemu_alarm_timer *t) +{ + struct sigevent ev; + timer_t host_timer; + struct sigaction act; + + sigfillset(&act.sa_mask); + act.sa_flags = 0; + act.sa_handler = host_alarm_handler; + + sigaction(SIGALRM, &act, NULL); + + /* + * Initialize ev struct to 0 to avoid valgrind complaining + * about uninitialized data in timer_create call + */ + memset(&ev, 0, sizeof(ev)); + ev.sigev_value.sival_int = 0; + ev.sigev_notify = SIGEV_SIGNAL; + ev.sigev_signo = SIGALRM; + + if (timer_create(CLOCK_REALTIME, &ev, &host_timer)) { + perror("timer_create"); + + /* disable dynticks */ + fprintf(stderr, "Dynamic Ticks disabled\n"); + + return -1; + } + + t->priv = (void *)(long)host_timer; + + return 0; +} + +static void dynticks_stop_timer(struct qemu_alarm_timer *t) +{ + timer_t host_timer = (timer_t)(long)t->priv; + + timer_delete(host_timer); +} + +static void dynticks_rearm_timer(struct qemu_alarm_timer *t) +{ + timer_t host_timer = (timer_t)(long)t->priv; + struct itimerspec timeout; + int64_t nearest_delta_us = INT64_MAX; + int64_t current_us; + + assert(alarm_has_dynticks(t)); + if (!active_timers[QEMU_CLOCK_REALTIME] && + !active_timers[QEMU_CLOCK_VIRTUAL] && + !active_timers[QEMU_CLOCK_HOST]) + return; + + nearest_delta_us = qemu_next_deadline_dyntick(); + + /* check whether a timer is already running */ + if (timer_gettime(host_timer, &timeout)) { + perror("gettime"); + fprintf(stderr, "Internal timer error: aborting\n"); + exit(1); + } + current_us = timeout.it_value.tv_sec * 1000000 + timeout.it_value.tv_nsec/1000; + if (current_us && current_us <= nearest_delta_us) + return; + + timeout.it_interval.tv_sec = 0; + timeout.it_interval.tv_nsec = 0; /* 0 for one-shot timer */ + timeout.it_value.tv_sec = nearest_delta_us / 1000000; + timeout.it_value.tv_nsec = (nearest_delta_us % 1000000) * 1000; + if (timer_settime(host_timer, 0 /* RELATIVE */, &timeout, NULL)) { + perror("settime"); + fprintf(stderr, "Internal timer error: aborting\n"); + exit(1); + } +} + +#endif /* defined(__linux__) */ + +static int unix_start_timer(struct qemu_alarm_timer *t) +{ + struct sigaction act; + struct itimerval itv; + int err; + + /* timer signal */ + sigfillset(&act.sa_mask); + act.sa_flags = 0; + act.sa_handler = host_alarm_handler; + + sigaction(SIGALRM, &act, NULL); + + itv.it_interval.tv_sec = 0; + /* for i386 kernel 2.6 to get 1 ms */ + itv.it_interval.tv_usec = 999; + itv.it_value.tv_sec = 0; + itv.it_value.tv_usec = 10 * 1000; + + err = setitimer(ITIMER_REAL, &itv, NULL); + if (err) + return -1; + + return 0; +} + +static void unix_stop_timer(struct qemu_alarm_timer *t) +{ + struct itimerval itv; + + memset(&itv, 0, sizeof(itv)); + setitimer(ITIMER_REAL, &itv, NULL); +} + +#endif /* !defined(_WIN32) */ + + +#ifdef _WIN32 + +static int win32_start_timer(struct qemu_alarm_timer *t) +{ + TIMECAPS tc; + struct qemu_alarm_win32 *data = t->priv; + UINT flags; + + memset(&tc, 0, sizeof(tc)); + timeGetDevCaps(&tc, sizeof(tc)); + + data->period = tc.wPeriodMin; + timeBeginPeriod(data->period); + + flags = TIME_CALLBACK_FUNCTION; + if (alarm_has_dynticks(t)) + flags |= TIME_ONESHOT; + else + flags |= TIME_PERIODIC; + + data->timerId = timeSetEvent(1, // interval (ms) + data->period, // resolution + host_alarm_handler, // function + (DWORD)t, // parameter + flags); + + if (!data->timerId) { + fprintf(stderr, "Failed to initialize win32 alarm timer: %ld\n", + GetLastError()); + timeEndPeriod(data->period); + return -1; + } + + return 0; +} + +static void win32_stop_timer(struct qemu_alarm_timer *t) +{ + struct qemu_alarm_win32 *data = t->priv; + + timeKillEvent(data->timerId); + timeEndPeriod(data->period); +} + +static void win32_rearm_timer(struct qemu_alarm_timer *t) +{ + struct qemu_alarm_win32 *data = t->priv; + + assert(alarm_has_dynticks(t)); + if (!active_timers[QEMU_CLOCK_REALTIME] && + !active_timers[QEMU_CLOCK_VIRTUAL] && + !active_timers[QEMU_CLOCK_HOST]) + return; + + timeKillEvent(data->timerId); + + data->timerId = timeSetEvent(1, + data->period, + host_alarm_handler, + (DWORD)t, + TIME_ONESHOT | TIME_CALLBACK_FUNCTION); + + if (!data->timerId) { + fprintf(stderr, "Failed to re-arm win32 alarm timer %ld\n", + GetLastError()); + + timeEndPeriod(data->period); + exit(1); + } +} + +#endif /* _WIN32 */ + +static void alarm_timer_on_change_state_rearm(void *opaque, int running, int reason) +{ + if (running) + qemu_rearm_alarm_timer((struct qemu_alarm_timer *) opaque); +} + +int init_timer_alarm(void) +{ + struct qemu_alarm_timer *t = NULL; + int i, err = -1; + + for (i = 0; alarm_timers[i].name; i++) { + t = &alarm_timers[i]; + + err = t->start(t); + if (!err) + break; + } + + if (err) { + err = -ENOENT; + goto fail; + } + + /* first event is at time 0 */ + t->pending = 1; + alarm_timer = t; + qemu_add_vm_change_state_handler(alarm_timer_on_change_state_rearm, t); + + return 0; + +fail: + return err; +} + +void quit_timers(void) +{ + struct qemu_alarm_timer *t = alarm_timer; + alarm_timer = NULL; + t->stop(t); +} + +int qemu_calculate_timeout(void) +{ +#ifndef CONFIG_IOTHREAD + int timeout; + + if (!vm_running) + timeout = 5000; + else { + /* XXX: use timeout computed from timers */ + int64_t add; + int64_t delta; + /* Advance virtual time to the next event. */ + delta = qemu_icount_delta(); + if (delta > 0) { + /* If virtual time is ahead of real time then just + wait for IO. */ + timeout = (delta + 999999) / 1000000; + } else { + /* Wait for either IO to occur or the next + timer event. */ + add = qemu_next_deadline(); + /* We advance the timer before checking for IO. + Limit the amount we advance so that early IO + activity won't get the guest too far ahead. */ + if (add > 10000000) + add = 10000000; + delta += add; + qemu_icount += qemu_icount_round (add); + timeout = delta / 1000000; + if (timeout < 0) + timeout = 0; + } + } + + return timeout; +#else /* CONFIG_IOTHREAD */ + return 1000; +#endif +} + diff --git a/qemu-timer.h b/qemu-timer.h index c17b4e6058..fca11ebd55 100644 --- a/qemu-timer.h +++ b/qemu-timer.h @@ -26,6 +26,7 @@ extern QEMUClock *host_clock; int64_t qemu_get_clock(QEMUClock *clock); int64_t qemu_get_clock_ns(QEMUClock *clock); +void qemu_clock_enable(QEMUClock *clock, int enabled); QEMUTimer *qemu_new_timer(QEMUClock *clock, QEMUTimerCB *cb, void *opaque); void qemu_free_timer(QEMUTimer *ts); @@ -34,11 +35,22 @@ void qemu_mod_timer(QEMUTimer *ts, int64_t expire_time); int qemu_timer_pending(QEMUTimer *ts); int qemu_timer_expired(QEMUTimer *timer_head, int64_t current_time); +void qemu_run_all_timers(void); +int qemu_alarm_pending(void); +int64_t qemu_next_deadline(void); +void configure_alarms(char const *opt); +void configure_icount(const char *option); +int qemu_calculate_timeout(void); +void init_clocks(void); +int init_timer_alarm(void); +void quit_timers(void); + static inline int64_t get_ticks_per_sec(void) { return 1000000000LL; } + void qemu_get_timer(QEMUFile *f, QEMUTimer *ts); void qemu_put_timer(QEMUFile *f, QEMUTimer *ts); @@ -59,14 +59,8 @@ #ifdef __linux__ #include <pty.h> #include <malloc.h> -#include <linux/rtc.h> #include <sys/prctl.h> -/* For the benefit of older linux systems which don't supply it, - we use a local copy of hpet.h. */ -/* #include <linux/hpet.h> */ -#include "hpet.h" - #include <linux/ppdev.h> #include <linux/parport.h> #endif @@ -101,7 +95,6 @@ extern int madvise(caddr_t, size_t, int); #ifdef _WIN32 #include <windows.h> -#include <mmsystem.h> #endif #ifdef CONFIG_SDL @@ -258,14 +251,6 @@ uint64_t node_cpumask[MAX_NODES]; static CPUState *cur_cpu; static CPUState *next_cpu; -/* Conversion factor from emulated instructions to virtual clock ticks. */ -static int icount_time_shift; -/* Arbitrarily pick 1MIPS as the minimum allowable speed. */ -#define MAX_ICOUNT_SHIFT 10 -/* Compensate for varying guest execution speed. */ -static int64_t qemu_icount_bias; -static QEMUTimer *icount_rt_timer; -static QEMUTimer *icount_vm_timer; static QEMUTimer *nographic_timer; uint8_t qemu_uuid[16]; @@ -421,1117 +406,6 @@ uint64_t muldiv64(uint64_t a, uint32_t b, uint32_t c) return res.ll; } -static int64_t get_clock_realtime(void) -{ - struct timeval tv; - - gettimeofday(&tv, NULL); - return tv.tv_sec * 1000000000LL + (tv.tv_usec * 1000); -} - -#ifdef WIN32 - -static int64_t clock_freq; - -static void init_get_clock(void) -{ - LARGE_INTEGER freq; - int ret; - ret = QueryPerformanceFrequency(&freq); - if (ret == 0) { - fprintf(stderr, "Could not calibrate ticks\n"); - exit(1); - } - clock_freq = freq.QuadPart; -} - -static int64_t get_clock(void) -{ - LARGE_INTEGER ti; - QueryPerformanceCounter(&ti); - return muldiv64(ti.QuadPart, get_ticks_per_sec(), clock_freq); -} - -#else - -static int use_rt_clock; - -static void init_get_clock(void) -{ - use_rt_clock = 0; -#if defined(__linux__) || (defined(__FreeBSD__) && __FreeBSD_version >= 500000) \ - || defined(__DragonFly__) || defined(__FreeBSD_kernel__) - { - struct timespec ts; - if (clock_gettime(CLOCK_MONOTONIC, &ts) == 0) { - use_rt_clock = 1; - } - } -#endif -} - -static int64_t get_clock(void) -{ -#if defined(__linux__) || (defined(__FreeBSD__) && __FreeBSD_version >= 500000) \ - || defined(__DragonFly__) || defined(__FreeBSD_kernel__) - if (use_rt_clock) { - struct timespec ts; - clock_gettime(CLOCK_MONOTONIC, &ts); - return ts.tv_sec * 1000000000LL + ts.tv_nsec; - } else -#endif - { - /* XXX: using gettimeofday leads to problems if the date - changes, so it should be avoided. */ - return get_clock_realtime(); - } -} -#endif - -/* Return the virtual CPU time, based on the instruction counter. */ -static int64_t cpu_get_icount(void) -{ - int64_t icount; - CPUState *env = cpu_single_env;; - icount = qemu_icount; - if (env) { - if (!can_do_io(env)) - fprintf(stderr, "Bad clock read\n"); - icount -= (env->icount_decr.u16.low + env->icount_extra); - } - return qemu_icount_bias + (icount << icount_time_shift); -} - -/***********************************************************/ -/* guest cycle counter */ - -typedef struct TimersState { - int64_t cpu_ticks_prev; - int64_t cpu_ticks_offset; - int64_t cpu_clock_offset; - int32_t cpu_ticks_enabled; - int64_t dummy; -} TimersState; - -TimersState timers_state; - -/* return the host CPU cycle counter and handle stop/restart */ -int64_t cpu_get_ticks(void) -{ - if (use_icount) { - return cpu_get_icount(); - } - if (!timers_state.cpu_ticks_enabled) { - return timers_state.cpu_ticks_offset; - } else { - int64_t ticks; - ticks = cpu_get_real_ticks(); - if (timers_state.cpu_ticks_prev > ticks) { - /* Note: non increasing ticks may happen if the host uses - software suspend */ - timers_state.cpu_ticks_offset += timers_state.cpu_ticks_prev - ticks; - } - timers_state.cpu_ticks_prev = ticks; - return ticks + timers_state.cpu_ticks_offset; - } -} - -/* return the host CPU monotonic timer and handle stop/restart */ -static int64_t cpu_get_clock(void) -{ - int64_t ti; - if (!timers_state.cpu_ticks_enabled) { - return timers_state.cpu_clock_offset; - } else { - ti = get_clock(); - return ti + timers_state.cpu_clock_offset; - } -} - -#ifndef CONFIG_IOTHREAD -static int64_t qemu_icount_delta(void) -{ - if (!use_icount) { - return 5000 * (int64_t) 1000000; - } else if (use_icount == 1) { - /* When not using an adaptive execution frequency - we tend to get badly out of sync with real time, - so just delay for a reasonable amount of time. */ - return 0; - } else { - return cpu_get_icount() - cpu_get_clock(); - } -} -#endif - -/* enable cpu_get_ticks() */ -void cpu_enable_ticks(void) -{ - if (!timers_state.cpu_ticks_enabled) { - timers_state.cpu_ticks_offset -= cpu_get_real_ticks(); - timers_state.cpu_clock_offset -= get_clock(); - timers_state.cpu_ticks_enabled = 1; - } -} - -/* disable cpu_get_ticks() : the clock is stopped. You must not call - cpu_get_ticks() after that. */ -void cpu_disable_ticks(void) -{ - if (timers_state.cpu_ticks_enabled) { - timers_state.cpu_ticks_offset = cpu_get_ticks(); - timers_state.cpu_clock_offset = cpu_get_clock(); - timers_state.cpu_ticks_enabled = 0; - } -} - -/***********************************************************/ -/* timers */ - -#define QEMU_CLOCK_REALTIME 0 -#define QEMU_CLOCK_VIRTUAL 1 -#define QEMU_CLOCK_HOST 2 - -struct QEMUClock { - int type; - int enabled; - /* XXX: add frequency */ -}; - -struct QEMUTimer { - QEMUClock *clock; - int64_t expire_time; - QEMUTimerCB *cb; - void *opaque; - struct QEMUTimer *next; -}; - -struct qemu_alarm_timer { - char const *name; - int (*start)(struct qemu_alarm_timer *t); - void (*stop)(struct qemu_alarm_timer *t); - void (*rearm)(struct qemu_alarm_timer *t); - void *priv; - - char expired; - char pending; -}; - -static struct qemu_alarm_timer *alarm_timer; -static int qemu_calculate_timeout(void); - -static inline int qemu_alarm_pending(void) -{ - return alarm_timer->pending; -} - -static inline int alarm_has_dynticks(struct qemu_alarm_timer *t) -{ - return !!t->rearm; -} - -static void qemu_rearm_alarm_timer(struct qemu_alarm_timer *t) -{ - if (!alarm_has_dynticks(t)) - return; - - t->rearm(t); -} - -/* TODO: MIN_TIMER_REARM_US should be optimized */ -#define MIN_TIMER_REARM_US 250 - -#ifdef _WIN32 - -struct qemu_alarm_win32 { - MMRESULT timerId; - unsigned int period; -} alarm_win32_data = {0, 0}; - -static int win32_start_timer(struct qemu_alarm_timer *t); -static void win32_stop_timer(struct qemu_alarm_timer *t); -static void win32_rearm_timer(struct qemu_alarm_timer *t); - -#else - -static int unix_start_timer(struct qemu_alarm_timer *t); -static void unix_stop_timer(struct qemu_alarm_timer *t); - -#ifdef __linux__ - -static int dynticks_start_timer(struct qemu_alarm_timer *t); -static void dynticks_stop_timer(struct qemu_alarm_timer *t); -static void dynticks_rearm_timer(struct qemu_alarm_timer *t); - -static int hpet_start_timer(struct qemu_alarm_timer *t); -static void hpet_stop_timer(struct qemu_alarm_timer *t); - -static int rtc_start_timer(struct qemu_alarm_timer *t); -static void rtc_stop_timer(struct qemu_alarm_timer *t); - -#endif /* __linux__ */ - -#endif /* _WIN32 */ - -/* Correlation between real and virtual time is always going to be - fairly approximate, so ignore small variation. - When the guest is idle real and virtual time will be aligned in - the IO wait loop. */ -#define ICOUNT_WOBBLE (get_ticks_per_sec() / 10) - -static void icount_adjust(void) -{ - int64_t cur_time; - int64_t cur_icount; - int64_t delta; - static int64_t last_delta; - /* If the VM is not running, then do nothing. */ - if (!vm_running) - return; - - cur_time = cpu_get_clock(); - cur_icount = qemu_get_clock(vm_clock); - delta = cur_icount - cur_time; - /* FIXME: This is a very crude algorithm, somewhat prone to oscillation. */ - if (delta > 0 - && last_delta + ICOUNT_WOBBLE < delta * 2 - && icount_time_shift > 0) { - /* The guest is getting too far ahead. Slow time down. */ - icount_time_shift--; - } - if (delta < 0 - && last_delta - ICOUNT_WOBBLE > delta * 2 - && icount_time_shift < MAX_ICOUNT_SHIFT) { - /* The guest is getting too far behind. Speed time up. */ - icount_time_shift++; - } - last_delta = delta; - qemu_icount_bias = cur_icount - (qemu_icount << icount_time_shift); -} - -static void icount_adjust_rt(void * opaque) -{ - qemu_mod_timer(icount_rt_timer, - qemu_get_clock(rt_clock) + 1000); - icount_adjust(); -} - -static void icount_adjust_vm(void * opaque) -{ - qemu_mod_timer(icount_vm_timer, - qemu_get_clock(vm_clock) + get_ticks_per_sec() / 10); - icount_adjust(); -} - -static int64_t qemu_icount_round(int64_t count) -{ - return (count + (1 << icount_time_shift) - 1) >> icount_time_shift; -} - -static struct qemu_alarm_timer alarm_timers[] = { -#ifndef _WIN32 -#ifdef __linux__ - {"dynticks", dynticks_start_timer, - dynticks_stop_timer, dynticks_rearm_timer, NULL}, - /* HPET - if available - is preferred */ - {"hpet", hpet_start_timer, hpet_stop_timer, NULL, NULL}, - /* ...otherwise try RTC */ - {"rtc", rtc_start_timer, rtc_stop_timer, NULL, NULL}, -#endif - {"unix", unix_start_timer, unix_stop_timer, NULL, NULL}, -#else - {"dynticks", win32_start_timer, - win32_stop_timer, win32_rearm_timer, &alarm_win32_data}, - {"win32", win32_start_timer, - win32_stop_timer, NULL, &alarm_win32_data}, -#endif - {NULL, } -}; - -static void show_available_alarms(void) -{ - int i; - - printf("Available alarm timers, in order of precedence:\n"); - for (i = 0; alarm_timers[i].name; i++) - printf("%s\n", alarm_timers[i].name); -} - -static void configure_alarms(char const *opt) -{ - int i; - int cur = 0; - int count = ARRAY_SIZE(alarm_timers) - 1; - char *arg; - char *name; - struct qemu_alarm_timer tmp; - - if (!strcmp(opt, "?")) { - show_available_alarms(); - exit(0); - } - - arg = qemu_strdup(opt); - - /* Reorder the array */ - name = strtok(arg, ","); - while (name) { - for (i = 0; i < count && alarm_timers[i].name; i++) { - if (!strcmp(alarm_timers[i].name, name)) - break; - } - - if (i == count) { - fprintf(stderr, "Unknown clock %s\n", name); - goto next; - } - - if (i < cur) - /* Ignore */ - goto next; - - /* Swap */ - tmp = alarm_timers[i]; - alarm_timers[i] = alarm_timers[cur]; - alarm_timers[cur] = tmp; - - cur++; -next: - name = strtok(NULL, ","); - } - - qemu_free(arg); - - if (cur) { - /* Disable remaining timers */ - for (i = cur; i < count; i++) - alarm_timers[i].name = NULL; - } else { - show_available_alarms(); - exit(1); - } -} - -#define QEMU_NUM_CLOCKS 3 - -QEMUClock *rt_clock; -QEMUClock *vm_clock; -QEMUClock *host_clock; - -static QEMUTimer *active_timers[QEMU_NUM_CLOCKS]; - -static QEMUClock *qemu_new_clock(int type) -{ - QEMUClock *clock; - clock = qemu_mallocz(sizeof(QEMUClock)); - clock->type = type; - clock->enabled = 1; - return clock; -} - -static void qemu_clock_enable(QEMUClock *clock, int enabled) -{ - clock->enabled = enabled; -} - -QEMUTimer *qemu_new_timer(QEMUClock *clock, QEMUTimerCB *cb, void *opaque) -{ - QEMUTimer *ts; - - ts = qemu_mallocz(sizeof(QEMUTimer)); - ts->clock = clock; - ts->cb = cb; - ts->opaque = opaque; - return ts; -} - -void qemu_free_timer(QEMUTimer *ts) -{ - qemu_free(ts); -} - -/* stop a timer, but do not dealloc it */ -void qemu_del_timer(QEMUTimer *ts) -{ - QEMUTimer **pt, *t; - - /* NOTE: this code must be signal safe because - qemu_timer_expired() can be called from a signal. */ - pt = &active_timers[ts->clock->type]; - for(;;) { - t = *pt; - if (!t) - break; - if (t == ts) { - *pt = t->next; - break; - } - pt = &t->next; - } -} - -/* modify the current timer so that it will be fired when current_time - >= expire_time. The corresponding callback will be called. */ -void qemu_mod_timer(QEMUTimer *ts, int64_t expire_time) -{ - QEMUTimer **pt, *t; - - qemu_del_timer(ts); - - /* add the timer in the sorted list */ - /* NOTE: this code must be signal safe because - qemu_timer_expired() can be called from a signal. */ - pt = &active_timers[ts->clock->type]; - for(;;) { - t = *pt; - if (!t) - break; - if (t->expire_time > expire_time) - break; - pt = &t->next; - } - ts->expire_time = expire_time; - ts->next = *pt; - *pt = ts; - - /* Rearm if necessary */ - if (pt == &active_timers[ts->clock->type]) { - if (!alarm_timer->pending) { - qemu_rearm_alarm_timer(alarm_timer); - } - /* Interrupt execution to force deadline recalculation. */ - if (use_icount) - qemu_notify_event(); - } -} - -int qemu_timer_pending(QEMUTimer *ts) -{ - QEMUTimer *t; - for(t = active_timers[ts->clock->type]; t != NULL; t = t->next) { - if (t == ts) - return 1; - } - return 0; -} - -int qemu_timer_expired(QEMUTimer *timer_head, int64_t current_time) -{ - if (!timer_head) - return 0; - return (timer_head->expire_time <= current_time); -} - -static void qemu_run_timers(QEMUClock *clock) -{ - QEMUTimer **ptimer_head, *ts; - int64_t current_time; - - if (!clock->enabled) - return; - - current_time = qemu_get_clock (clock); - ptimer_head = &active_timers[clock->type]; - for(;;) { - ts = *ptimer_head; - if (!ts || ts->expire_time > current_time) - break; - /* remove timer from the list before calling the callback */ - *ptimer_head = ts->next; - ts->next = NULL; - - /* run the callback (the timer list can be modified) */ - ts->cb(ts->opaque); - } -} - -int64_t qemu_get_clock(QEMUClock *clock) -{ - switch(clock->type) { - case QEMU_CLOCK_REALTIME: - return get_clock() / 1000000; - default: - case QEMU_CLOCK_VIRTUAL: - if (use_icount) { - return cpu_get_icount(); - } else { - return cpu_get_clock(); - } - case QEMU_CLOCK_HOST: - return get_clock_realtime(); - } -} - -int64_t qemu_get_clock_ns(QEMUClock *clock) -{ - switch(clock->type) { - case QEMU_CLOCK_REALTIME: - return get_clock(); - default: - case QEMU_CLOCK_VIRTUAL: - if (use_icount) { - return cpu_get_icount(); - } else { - return cpu_get_clock(); - } - case QEMU_CLOCK_HOST: - return get_clock_realtime(); - } -} - -static void init_clocks(void) -{ - init_get_clock(); - rt_clock = qemu_new_clock(QEMU_CLOCK_REALTIME); - vm_clock = qemu_new_clock(QEMU_CLOCK_VIRTUAL); - host_clock = qemu_new_clock(QEMU_CLOCK_HOST); - - rtc_clock = host_clock; -} - -/* save a timer */ -void qemu_put_timer(QEMUFile *f, QEMUTimer *ts) -{ - uint64_t expire_time; - - if (qemu_timer_pending(ts)) { - expire_time = ts->expire_time; - } else { - expire_time = -1; - } - qemu_put_be64(f, expire_time); -} - -void qemu_get_timer(QEMUFile *f, QEMUTimer *ts) -{ - uint64_t expire_time; - - expire_time = qemu_get_be64(f); - if (expire_time != -1) { - qemu_mod_timer(ts, expire_time); - } else { - qemu_del_timer(ts); - } -} - -static const VMStateDescription vmstate_timers = { - .name = "timer", - .version_id = 2, - .minimum_version_id = 1, - .minimum_version_id_old = 1, - .fields = (VMStateField []) { - VMSTATE_INT64(cpu_ticks_offset, TimersState), - VMSTATE_INT64(dummy, TimersState), - VMSTATE_INT64_V(cpu_clock_offset, TimersState, 2), - VMSTATE_END_OF_LIST() - } -}; - -static void configure_icount(const char *option) -{ - vmstate_register(0, &vmstate_timers, &timers_state); - if (!option) - return; - - if (strcmp(option, "auto") != 0) { - icount_time_shift = strtol(option, NULL, 0); - use_icount = 1; - return; - } - - use_icount = 2; - - /* 125MIPS seems a reasonable initial guess at the guest speed. - It will be corrected fairly quickly anyway. */ - icount_time_shift = 3; - - /* Have both realtime and virtual time triggers for speed adjustment. - The realtime trigger catches emulated time passing too slowly, - the virtual time trigger catches emulated time passing too fast. - Realtime triggers occur even when idle, so use them less frequently - than VM triggers. */ - icount_rt_timer = qemu_new_timer(rt_clock, icount_adjust_rt, NULL); - qemu_mod_timer(icount_rt_timer, - qemu_get_clock(rt_clock) + 1000); - icount_vm_timer = qemu_new_timer(vm_clock, icount_adjust_vm, NULL); - qemu_mod_timer(icount_vm_timer, - qemu_get_clock(vm_clock) + get_ticks_per_sec() / 10); -} - -static void qemu_run_all_timers(void) -{ - /* rearm timer, if not periodic */ - if (alarm_timer->expired) { - alarm_timer->expired = 0; - qemu_rearm_alarm_timer(alarm_timer); - } - - alarm_timer->pending = 0; - - /* vm time timers */ - if (vm_running) { - qemu_run_timers(vm_clock); - } - - qemu_run_timers(rt_clock); - qemu_run_timers(host_clock); -} - -#ifdef _WIN32 -static void CALLBACK host_alarm_handler(UINT uTimerID, UINT uMsg, - DWORD_PTR dwUser, DWORD_PTR dw1, - DWORD_PTR dw2) -#else -static void host_alarm_handler(int host_signum) -#endif -{ - struct qemu_alarm_timer *t = alarm_timer; - if (!t) - return; - -#if 0 -#define DISP_FREQ 1000 - { - static int64_t delta_min = INT64_MAX; - static int64_t delta_max, delta_cum, last_clock, delta, ti; - static int count; - ti = qemu_get_clock(vm_clock); - if (last_clock != 0) { - delta = ti - last_clock; - if (delta < delta_min) - delta_min = delta; - if (delta > delta_max) - delta_max = delta; - delta_cum += delta; - if (++count == DISP_FREQ) { - printf("timer: min=%" PRId64 " us max=%" PRId64 " us avg=%" PRId64 " us avg_freq=%0.3f Hz\n", - muldiv64(delta_min, 1000000, get_ticks_per_sec()), - muldiv64(delta_max, 1000000, get_ticks_per_sec()), - muldiv64(delta_cum, 1000000 / DISP_FREQ, get_ticks_per_sec()), - (double)get_ticks_per_sec() / ((double)delta_cum / DISP_FREQ)); - count = 0; - delta_min = INT64_MAX; - delta_max = 0; - delta_cum = 0; - } - } - last_clock = ti; - } -#endif - if (alarm_has_dynticks(t) || - (!use_icount && - qemu_timer_expired(active_timers[QEMU_CLOCK_VIRTUAL], - qemu_get_clock(vm_clock))) || - qemu_timer_expired(active_timers[QEMU_CLOCK_REALTIME], - qemu_get_clock(rt_clock)) || - qemu_timer_expired(active_timers[QEMU_CLOCK_HOST], - qemu_get_clock(host_clock))) { - - t->expired = alarm_has_dynticks(t); - t->pending = 1; - qemu_notify_event(); - } -} - -static int64_t qemu_next_deadline(void) -{ - /* To avoid problems with overflow limit this to 2^32. */ - int64_t delta = INT32_MAX; - - if (active_timers[QEMU_CLOCK_VIRTUAL]) { - delta = active_timers[QEMU_CLOCK_VIRTUAL]->expire_time - - qemu_get_clock(vm_clock); - } - if (active_timers[QEMU_CLOCK_HOST]) { - int64_t hdelta = active_timers[QEMU_CLOCK_HOST]->expire_time - - qemu_get_clock(host_clock); - if (hdelta < delta) - delta = hdelta; - } - - if (delta < 0) - delta = 0; - - return delta; -} - -#if defined(__linux__) -static uint64_t qemu_next_deadline_dyntick(void) -{ - int64_t delta; - int64_t rtdelta; - - if (use_icount) - delta = INT32_MAX; - else - delta = (qemu_next_deadline() + 999) / 1000; - - if (active_timers[QEMU_CLOCK_REALTIME]) { - rtdelta = (active_timers[QEMU_CLOCK_REALTIME]->expire_time - - qemu_get_clock(rt_clock))*1000; - if (rtdelta < delta) - delta = rtdelta; - } - - if (delta < MIN_TIMER_REARM_US) - delta = MIN_TIMER_REARM_US; - - return delta; -} -#endif - -#ifndef _WIN32 - -/* Sets a specific flag */ -static int fcntl_setfl(int fd, int flag) -{ - int flags; - - flags = fcntl(fd, F_GETFL); - if (flags == -1) - return -errno; - - if (fcntl(fd, F_SETFL, flags | flag) == -1) - return -errno; - - return 0; -} - -#if defined(__linux__) - -#define RTC_FREQ 1024 - -static void enable_sigio_timer(int fd) -{ - struct sigaction act; - - /* timer signal */ - sigfillset(&act.sa_mask); - act.sa_flags = 0; - act.sa_handler = host_alarm_handler; - - sigaction(SIGIO, &act, NULL); - fcntl_setfl(fd, O_ASYNC); - fcntl(fd, F_SETOWN, getpid()); -} - -static int hpet_start_timer(struct qemu_alarm_timer *t) -{ - struct hpet_info info; - int r, fd; - - fd = qemu_open("/dev/hpet", O_RDONLY); - if (fd < 0) - return -1; - - /* Set frequency */ - r = ioctl(fd, HPET_IRQFREQ, RTC_FREQ); - if (r < 0) { - fprintf(stderr, "Could not configure '/dev/hpet' to have a 1024Hz timer. This is not a fatal\n" - "error, but for better emulation accuracy type:\n" - "'echo 1024 > /proc/sys/dev/hpet/max-user-freq' as root.\n"); - goto fail; - } - - /* Check capabilities */ - r = ioctl(fd, HPET_INFO, &info); - if (r < 0) - goto fail; - - /* Enable periodic mode */ - r = ioctl(fd, HPET_EPI, 0); - if (info.hi_flags && (r < 0)) - goto fail; - - /* Enable interrupt */ - r = ioctl(fd, HPET_IE_ON, 0); - if (r < 0) - goto fail; - - enable_sigio_timer(fd); - t->priv = (void *)(long)fd; - - return 0; -fail: - close(fd); - return -1; -} - -static void hpet_stop_timer(struct qemu_alarm_timer *t) -{ - int fd = (long)t->priv; - - close(fd); -} - -static int rtc_start_timer(struct qemu_alarm_timer *t) -{ - int rtc_fd; - unsigned long current_rtc_freq = 0; - - TFR(rtc_fd = qemu_open("/dev/rtc", O_RDONLY)); - if (rtc_fd < 0) - return -1; - ioctl(rtc_fd, RTC_IRQP_READ, ¤t_rtc_freq); - if (current_rtc_freq != RTC_FREQ && - ioctl(rtc_fd, RTC_IRQP_SET, RTC_FREQ) < 0) { - fprintf(stderr, "Could not configure '/dev/rtc' to have a 1024 Hz timer. This is not a fatal\n" - "error, but for better emulation accuracy either use a 2.6 host Linux kernel or\n" - "type 'echo 1024 > /proc/sys/dev/rtc/max-user-freq' as root.\n"); - goto fail; - } - if (ioctl(rtc_fd, RTC_PIE_ON, 0) < 0) { - fail: - close(rtc_fd); - return -1; - } - - enable_sigio_timer(rtc_fd); - - t->priv = (void *)(long)rtc_fd; - - return 0; -} - -static void rtc_stop_timer(struct qemu_alarm_timer *t) -{ - int rtc_fd = (long)t->priv; - - close(rtc_fd); -} - -static int dynticks_start_timer(struct qemu_alarm_timer *t) -{ - struct sigevent ev; - timer_t host_timer; - struct sigaction act; - - sigfillset(&act.sa_mask); - act.sa_flags = 0; - act.sa_handler = host_alarm_handler; - - sigaction(SIGALRM, &act, NULL); - - /* - * Initialize ev struct to 0 to avoid valgrind complaining - * about uninitialized data in timer_create call - */ - memset(&ev, 0, sizeof(ev)); - ev.sigev_value.sival_int = 0; - ev.sigev_notify = SIGEV_SIGNAL; - ev.sigev_signo = SIGALRM; - - if (timer_create(CLOCK_REALTIME, &ev, &host_timer)) { - perror("timer_create"); - - /* disable dynticks */ - fprintf(stderr, "Dynamic Ticks disabled\n"); - - return -1; - } - - t->priv = (void *)(long)host_timer; - - return 0; -} - -static void dynticks_stop_timer(struct qemu_alarm_timer *t) -{ - timer_t host_timer = (timer_t)(long)t->priv; - - timer_delete(host_timer); -} - -static void dynticks_rearm_timer(struct qemu_alarm_timer *t) -{ - timer_t host_timer = (timer_t)(long)t->priv; - struct itimerspec timeout; - int64_t nearest_delta_us = INT64_MAX; - int64_t current_us; - - assert(alarm_has_dynticks(t)); - if (!active_timers[QEMU_CLOCK_REALTIME] && - !active_timers[QEMU_CLOCK_VIRTUAL] && - !active_timers[QEMU_CLOCK_HOST]) - return; - - nearest_delta_us = qemu_next_deadline_dyntick(); - - /* check whether a timer is already running */ - if (timer_gettime(host_timer, &timeout)) { - perror("gettime"); - fprintf(stderr, "Internal timer error: aborting\n"); - exit(1); - } - current_us = timeout.it_value.tv_sec * 1000000 + timeout.it_value.tv_nsec/1000; - if (current_us && current_us <= nearest_delta_us) - return; - - timeout.it_interval.tv_sec = 0; - timeout.it_interval.tv_nsec = 0; /* 0 for one-shot timer */ - timeout.it_value.tv_sec = nearest_delta_us / 1000000; - timeout.it_value.tv_nsec = (nearest_delta_us % 1000000) * 1000; - if (timer_settime(host_timer, 0 /* RELATIVE */, &timeout, NULL)) { - perror("settime"); - fprintf(stderr, "Internal timer error: aborting\n"); - exit(1); - } -} - -#endif /* defined(__linux__) */ - -static int unix_start_timer(struct qemu_alarm_timer *t) -{ - struct sigaction act; - struct itimerval itv; - int err; - - /* timer signal */ - sigfillset(&act.sa_mask); - act.sa_flags = 0; - act.sa_handler = host_alarm_handler; - - sigaction(SIGALRM, &act, NULL); - - itv.it_interval.tv_sec = 0; - /* for i386 kernel 2.6 to get 1 ms */ - itv.it_interval.tv_usec = 999; - itv.it_value.tv_sec = 0; - itv.it_value.tv_usec = 10 * 1000; - - err = setitimer(ITIMER_REAL, &itv, NULL); - if (err) - return -1; - - return 0; -} - -static void unix_stop_timer(struct qemu_alarm_timer *t) -{ - struct itimerval itv; - - memset(&itv, 0, sizeof(itv)); - setitimer(ITIMER_REAL, &itv, NULL); -} - -#endif /* !defined(_WIN32) */ - - -#ifdef _WIN32 - -static int win32_start_timer(struct qemu_alarm_timer *t) -{ - TIMECAPS tc; - struct qemu_alarm_win32 *data = t->priv; - UINT flags; - - memset(&tc, 0, sizeof(tc)); - timeGetDevCaps(&tc, sizeof(tc)); - - data->period = tc.wPeriodMin; - timeBeginPeriod(data->period); - - flags = TIME_CALLBACK_FUNCTION; - if (alarm_has_dynticks(t)) - flags |= TIME_ONESHOT; - else - flags |= TIME_PERIODIC; - - data->timerId = timeSetEvent(1, // interval (ms) - data->period, // resolution - host_alarm_handler, // function - (DWORD)t, // parameter - flags); - - if (!data->timerId) { - fprintf(stderr, "Failed to initialize win32 alarm timer: %ld\n", - GetLastError()); - timeEndPeriod(data->period); - return -1; - } - - return 0; -} - -static void win32_stop_timer(struct qemu_alarm_timer *t) -{ - struct qemu_alarm_win32 *data = t->priv; - - timeKillEvent(data->timerId); - timeEndPeriod(data->period); -} - -static void win32_rearm_timer(struct qemu_alarm_timer *t) -{ - struct qemu_alarm_win32 *data = t->priv; - - assert(alarm_has_dynticks(t)); - if (!active_timers[QEMU_CLOCK_REALTIME] && - !active_timers[QEMU_CLOCK_VIRTUAL] && - !active_timers[QEMU_CLOCK_HOST]) - return; - - timeKillEvent(data->timerId); - - data->timerId = timeSetEvent(1, - data->period, - host_alarm_handler, - (DWORD)t, - TIME_ONESHOT | TIME_CALLBACK_FUNCTION); - - if (!data->timerId) { - fprintf(stderr, "Failed to re-arm win32 alarm timer %ld\n", - GetLastError()); - - timeEndPeriod(data->period); - exit(1); - } -} - -#endif /* _WIN32 */ - -static void alarm_timer_on_change_state_rearm(void *opaque, int running, int reason) -{ - if (running) - qemu_rearm_alarm_timer((struct qemu_alarm_timer *) opaque); -} - -static int init_timer_alarm(void) -{ - struct qemu_alarm_timer *t = NULL; - int i, err = -1; - - for (i = 0; alarm_timers[i].name; i++) { - t = &alarm_timers[i]; - - err = t->start(t); - if (!err) - break; - } - - if (err) { - err = -ENOENT; - goto fail; - } - - /* first event is at time 0 */ - t->pending = 1; - alarm_timer = t; - qemu_add_vm_change_state_handler(alarm_timer_on_change_state_rearm, t); - - return 0; - -fail: - return err; -} - -static void quit_timers(void) -{ - struct qemu_alarm_timer *t = alarm_timer; - alarm_timer = NULL; - t->stop(t); -} - /***********************************************************/ /* host time/date access */ void qemu_get_timedate(struct tm *tm, int offset) @@ -4063,46 +2937,6 @@ static bool tcg_cpu_exec(void) return tcg_has_work(); } -static int qemu_calculate_timeout(void) -{ -#ifndef CONFIG_IOTHREAD - int timeout; - - if (!vm_running) - timeout = 5000; - else { - /* XXX: use timeout computed from timers */ - int64_t add; - int64_t delta; - /* Advance virtual time to the next event. */ - delta = qemu_icount_delta(); - if (delta > 0) { - /* If virtual time is ahead of real time then just - wait for IO. */ - timeout = (delta + 999999) / 1000000; - } else { - /* Wait for either IO to occur or the next - timer event. */ - add = qemu_next_deadline(); - /* We advance the timer before checking for IO. - Limit the amount we advance so that early IO - activity won't get the guest too far ahead. */ - if (add > 10000000) - add = 10000000; - delta += add; - qemu_icount += qemu_icount_round (add); - timeout = delta / 1000000; - if (timeout < 0) - timeout = 0; - } - } - - return timeout; -#else /* CONFIG_IOTHREAD */ - return 1000; -#endif -} - static int vm_can_run(void) { if (powerdown_requested) |