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timer: drop HPET and RTC 

dynticks will provide equally good timer granularity on all modern Linux
systems.  This is more or less dead code these days.

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Anthony Liguori 2011-05-31 10:51:11 -05:00
parent d800040fb4
commit 25f3151ece
1 changed files with 0 additions and 120 deletions
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120
qemu-timer.c
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@ -39,15 +39,6 @@
#include <sys/param.h>
#endif
#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>
@ -234,12 +225,6 @@ 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 */
@ -304,10 +289,6 @@ static struct qemu_alarm_timer alarm_timers[] = {
#ifdef __linux__
{"dynticks", dynticks_start_timer,
dynticks_stop_timer, dynticks_rearm_timer},
/* HPET - if available - is preferred */
{"hpet", hpet_start_timer, hpet_stop_timer, NULL},
/* ...otherwise try RTC */
{"rtc", rtc_start_timer, rtc_stop_timer, NULL},
#endif
{"unix", unix_start_timer, unix_stop_timer, NULL},
#else
@ -822,107 +803,6 @@ static int64_t qemu_next_alarm_deadline(void)
#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->fd = fd;
return 0;
fail:
close(fd);
return -1;
}
static void hpet_stop_timer(struct qemu_alarm_timer *t)
{
int fd = t->fd;
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, &current_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->fd = rtc_fd;
return 0;
}
static void rtc_stop_timer(struct qemu_alarm_timer *t)
{
int rtc_fd = t->fd;
close(rtc_fd);
}
static int dynticks_start_timer(struct qemu_alarm_timer *t)
{
struct sigevent ev;