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Documentation/timers/: split txt and source files
Documentation/timers/hpet.txt: Expose example and tool source files in the Documentation/timers/ directory in their own files instead of being buried (almost hidden) in readme/txt files. This should help to prevent bitrot. This will make them more visible/usable to users who may need to use them, to developers who may need to test with them, and to anyone who would fix/update them if they were more visible. Also, if any of these possibly should not be in the kernel tree at all, it will be clearer that they are here and we can discuss if they should be removed. Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Randy Dunlap
Linus Torvalds
parent
ad25ad979a
commit
e61863099f
@ -1,3 +1,3 @@
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obj-m := DocBook/ accounting/ auxdisplay/ connector/ \
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filesystems/configfs/ ia64/ networking/ \
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pcmcia/ spi/ video4linux/ vm/ watchdog/src/
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pcmcia/ spi/ timers/ video4linux/ vm/ watchdog/src/
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@ -4,6 +4,8 @@ highres.txt
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- High resolution timers and dynamic ticks design notes
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hpet.txt
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- High Precision Event Timer Driver for Linux
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hpet_example.c
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- sample hpet timer test program
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hrtimers.txt
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- subsystem for high-resolution kernel timers
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timer_stats.txt
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8
Documentation/timers/Makefile
Normal file
8
Documentation/timers/Makefile
Normal file
@ -0,0 +1,8 @@
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# kbuild trick to avoid linker error. Can be omitted if a module is built.
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obj- := dummy.o
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# List of programs to build
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hostprogs-y := hpet_example
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# Tell kbuild to always build the programs
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always := $(hostprogs-y)
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@ -26,274 +26,5 @@ initialization. An example of this initialization can be found in
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arch/x86/kernel/hpet.c.
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The driver provides a userspace API which resembles the API found in the
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RTC driver framework. An example user space program is provided below.
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <string.h>
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#include <memory.h>
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#include <malloc.h>
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#include <time.h>
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#include <ctype.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <signal.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <sys/time.h>
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#include <linux/hpet.h>
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extern void hpet_open_close(int, const char **);
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extern void hpet_info(int, const char **);
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extern void hpet_poll(int, const char **);
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extern void hpet_fasync(int, const char **);
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extern void hpet_read(int, const char **);
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#include <sys/poll.h>
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#include <sys/ioctl.h>
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#include <signal.h>
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struct hpet_command {
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char *command;
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void (*func)(int argc, const char ** argv);
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} hpet_command[] = {
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{
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"open-close",
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hpet_open_close
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},
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{
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"info",
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hpet_info
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},
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{
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"poll",
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hpet_poll
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},
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{
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"fasync",
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hpet_fasync
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},
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};
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int
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main(int argc, const char ** argv)
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{
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int i;
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argc--;
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argv++;
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if (!argc) {
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fprintf(stderr, "-hpet: requires command\n");
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return -1;
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}
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for (i = 0; i < (sizeof (hpet_command) / sizeof (hpet_command[0])); i++)
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if (!strcmp(argv[0], hpet_command[i].command)) {
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argc--;
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argv++;
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fprintf(stderr, "-hpet: executing %s\n",
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hpet_command[i].command);
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hpet_command[i].func(argc, argv);
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return 0;
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}
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fprintf(stderr, "do_hpet: command %s not implemented\n", argv[0]);
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return -1;
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}
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void
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hpet_open_close(int argc, const char **argv)
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{
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int fd;
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if (argc != 1) {
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fprintf(stderr, "hpet_open_close: device-name\n");
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return;
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}
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fd = open(argv[0], O_RDONLY);
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if (fd < 0)
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fprintf(stderr, "hpet_open_close: open failed\n");
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else
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close(fd);
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return;
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}
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void
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hpet_info(int argc, const char **argv)
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{
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}
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void
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hpet_poll(int argc, const char **argv)
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{
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unsigned long freq;
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int iterations, i, fd;
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struct pollfd pfd;
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struct hpet_info info;
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struct timeval stv, etv;
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struct timezone tz;
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long usec;
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if (argc != 3) {
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fprintf(stderr, "hpet_poll: device-name freq iterations\n");
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return;
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}
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freq = atoi(argv[1]);
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iterations = atoi(argv[2]);
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fd = open(argv[0], O_RDONLY);
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if (fd < 0) {
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fprintf(stderr, "hpet_poll: open of %s failed\n", argv[0]);
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return;
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}
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if (ioctl(fd, HPET_IRQFREQ, freq) < 0) {
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fprintf(stderr, "hpet_poll: HPET_IRQFREQ failed\n");
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goto out;
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}
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if (ioctl(fd, HPET_INFO, &info) < 0) {
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fprintf(stderr, "hpet_poll: failed to get info\n");
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goto out;
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}
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fprintf(stderr, "hpet_poll: info.hi_flags 0x%lx\n", info.hi_flags);
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if (info.hi_flags && (ioctl(fd, HPET_EPI, 0) < 0)) {
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fprintf(stderr, "hpet_poll: HPET_EPI failed\n");
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goto out;
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}
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if (ioctl(fd, HPET_IE_ON, 0) < 0) {
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fprintf(stderr, "hpet_poll, HPET_IE_ON failed\n");
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goto out;
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}
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pfd.fd = fd;
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pfd.events = POLLIN;
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for (i = 0; i < iterations; i++) {
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pfd.revents = 0;
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gettimeofday(&stv, &tz);
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if (poll(&pfd, 1, -1) < 0)
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fprintf(stderr, "hpet_poll: poll failed\n");
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else {
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long data;
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gettimeofday(&etv, &tz);
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usec = stv.tv_sec * 1000000 + stv.tv_usec;
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usec = (etv.tv_sec * 1000000 + etv.tv_usec) - usec;
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fprintf(stderr,
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"hpet_poll: expired time = 0x%lx\n", usec);
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fprintf(stderr, "hpet_poll: revents = 0x%x\n",
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pfd.revents);
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if (read(fd, &data, sizeof(data)) != sizeof(data)) {
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fprintf(stderr, "hpet_poll: read failed\n");
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}
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else
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fprintf(stderr, "hpet_poll: data 0x%lx\n",
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data);
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}
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}
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out:
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close(fd);
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return;
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}
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static int hpet_sigio_count;
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static void
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hpet_sigio(int val)
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{
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fprintf(stderr, "hpet_sigio: called\n");
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hpet_sigio_count++;
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}
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void
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hpet_fasync(int argc, const char **argv)
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{
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unsigned long freq;
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int iterations, i, fd, value;
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sig_t oldsig;
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struct hpet_info info;
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hpet_sigio_count = 0;
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fd = -1;
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if ((oldsig = signal(SIGIO, hpet_sigio)) == SIG_ERR) {
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fprintf(stderr, "hpet_fasync: failed to set signal handler\n");
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return;
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}
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if (argc != 3) {
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fprintf(stderr, "hpet_fasync: device-name freq iterations\n");
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goto out;
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}
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fd = open(argv[0], O_RDONLY);
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if (fd < 0) {
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fprintf(stderr, "hpet_fasync: failed to open %s\n", argv[0]);
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return;
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}
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if ((fcntl(fd, F_SETOWN, getpid()) == 1) ||
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((value = fcntl(fd, F_GETFL)) == 1) ||
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(fcntl(fd, F_SETFL, value | O_ASYNC) == 1)) {
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fprintf(stderr, "hpet_fasync: fcntl failed\n");
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goto out;
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}
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freq = atoi(argv[1]);
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iterations = atoi(argv[2]);
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if (ioctl(fd, HPET_IRQFREQ, freq) < 0) {
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fprintf(stderr, "hpet_fasync: HPET_IRQFREQ failed\n");
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goto out;
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}
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if (ioctl(fd, HPET_INFO, &info) < 0) {
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fprintf(stderr, "hpet_fasync: failed to get info\n");
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goto out;
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}
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fprintf(stderr, "hpet_fasync: info.hi_flags 0x%lx\n", info.hi_flags);
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if (info.hi_flags && (ioctl(fd, HPET_EPI, 0) < 0)) {
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fprintf(stderr, "hpet_fasync: HPET_EPI failed\n");
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goto out;
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}
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if (ioctl(fd, HPET_IE_ON, 0) < 0) {
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fprintf(stderr, "hpet_fasync, HPET_IE_ON failed\n");
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goto out;
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}
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for (i = 0; i < iterations; i++) {
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(void) pause();
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fprintf(stderr, "hpet_fasync: count = %d\n", hpet_sigio_count);
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}
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out:
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signal(SIGIO, oldsig);
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if (fd >= 0)
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close(fd);
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return;
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}
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RTC driver framework. An example user space program is provided in
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file:Documentation/timers/hpet_example.c
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269
Documentation/timers/hpet_example.c
Normal file
269
Documentation/timers/hpet_example.c
Normal file
@ -0,0 +1,269 @@
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <string.h>
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#include <memory.h>
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#include <malloc.h>
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#include <time.h>
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#include <ctype.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <signal.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <sys/time.h>
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#include <linux/hpet.h>
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extern void hpet_open_close(int, const char **);
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extern void hpet_info(int, const char **);
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extern void hpet_poll(int, const char **);
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extern void hpet_fasync(int, const char **);
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extern void hpet_read(int, const char **);
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#include <sys/poll.h>
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#include <sys/ioctl.h>
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#include <signal.h>
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struct hpet_command {
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char *command;
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void (*func)(int argc, const char ** argv);
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} hpet_command[] = {
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{
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"open-close",
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hpet_open_close
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},
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{
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"info",
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hpet_info
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},
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{
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"poll",
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hpet_poll
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},
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{
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"fasync",
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hpet_fasync
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},
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};
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int
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main(int argc, const char ** argv)
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{
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int i;
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argc--;
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argv++;
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if (!argc) {
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fprintf(stderr, "-hpet: requires command\n");
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return -1;
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}
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for (i = 0; i < (sizeof (hpet_command) / sizeof (hpet_command[0])); i++)
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if (!strcmp(argv[0], hpet_command[i].command)) {
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argc--;
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argv++;
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fprintf(stderr, "-hpet: executing %s\n",
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hpet_command[i].command);
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hpet_command[i].func(argc, argv);
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return 0;
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}
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fprintf(stderr, "do_hpet: command %s not implemented\n", argv[0]);
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return -1;
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}
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void
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hpet_open_close(int argc, const char **argv)
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{
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int fd;
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if (argc != 1) {
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fprintf(stderr, "hpet_open_close: device-name\n");
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return;
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}
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fd = open(argv[0], O_RDONLY);
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if (fd < 0)
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fprintf(stderr, "hpet_open_close: open failed\n");
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else
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close(fd);
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return;
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}
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void
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hpet_info(int argc, const char **argv)
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{
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}
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void
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hpet_poll(int argc, const char **argv)
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{
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unsigned long freq;
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int iterations, i, fd;
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struct pollfd pfd;
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struct hpet_info info;
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struct timeval stv, etv;
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struct timezone tz;
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long usec;
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if (argc != 3) {
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fprintf(stderr, "hpet_poll: device-name freq iterations\n");
|
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return;
|
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}
|
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freq = atoi(argv[1]);
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iterations = atoi(argv[2]);
|
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|
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fd = open(argv[0], O_RDONLY);
|
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|
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if (fd < 0) {
|
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fprintf(stderr, "hpet_poll: open of %s failed\n", argv[0]);
|
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return;
|
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}
|
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|
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if (ioctl(fd, HPET_IRQFREQ, freq) < 0) {
|
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fprintf(stderr, "hpet_poll: HPET_IRQFREQ failed\n");
|
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goto out;
|
||||
}
|
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|
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if (ioctl(fd, HPET_INFO, &info) < 0) {
|
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fprintf(stderr, "hpet_poll: failed to get info\n");
|
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goto out;
|
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}
|
||||
|
||||
fprintf(stderr, "hpet_poll: info.hi_flags 0x%lx\n", info.hi_flags);
|
||||
|
||||
if (info.hi_flags && (ioctl(fd, HPET_EPI, 0) < 0)) {
|
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fprintf(stderr, "hpet_poll: HPET_EPI failed\n");
|
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goto out;
|
||||
}
|
||||
|
||||
if (ioctl(fd, HPET_IE_ON, 0) < 0) {
|
||||
fprintf(stderr, "hpet_poll, HPET_IE_ON failed\n");
|
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goto out;
|
||||
}
|
||||
|
||||
pfd.fd = fd;
|
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pfd.events = POLLIN;
|
||||
|
||||
for (i = 0; i < iterations; i++) {
|
||||
pfd.revents = 0;
|
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gettimeofday(&stv, &tz);
|
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if (poll(&pfd, 1, -1) < 0)
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fprintf(stderr, "hpet_poll: poll failed\n");
|
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else {
|
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long data;
|
||||
|
||||
gettimeofday(&etv, &tz);
|
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usec = stv.tv_sec * 1000000 + stv.tv_usec;
|
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usec = (etv.tv_sec * 1000000 + etv.tv_usec) - usec;
|
||||
|
||||
fprintf(stderr,
|
||||
"hpet_poll: expired time = 0x%lx\n", usec);
|
||||
|
||||
fprintf(stderr, "hpet_poll: revents = 0x%x\n",
|
||||
pfd.revents);
|
||||
|
||||
if (read(fd, &data, sizeof(data)) != sizeof(data)) {
|
||||
fprintf(stderr, "hpet_poll: read failed\n");
|
||||
}
|
||||
else
|
||||
fprintf(stderr, "hpet_poll: data 0x%lx\n",
|
||||
data);
|
||||
}
|
||||
}
|
||||
|
||||
out:
|
||||
close(fd);
|
||||
return;
|
||||
}
|
||||
|
||||
static int hpet_sigio_count;
|
||||
|
||||
static void
|
||||
hpet_sigio(int val)
|
||||
{
|
||||
fprintf(stderr, "hpet_sigio: called\n");
|
||||
hpet_sigio_count++;
|
||||
}
|
||||
|
||||
void
|
||||
hpet_fasync(int argc, const char **argv)
|
||||
{
|
||||
unsigned long freq;
|
||||
int iterations, i, fd, value;
|
||||
sig_t oldsig;
|
||||
struct hpet_info info;
|
||||
|
||||
hpet_sigio_count = 0;
|
||||
fd = -1;
|
||||
|
||||
if ((oldsig = signal(SIGIO, hpet_sigio)) == SIG_ERR) {
|
||||
fprintf(stderr, "hpet_fasync: failed to set signal handler\n");
|
||||
return;
|
||||
}
|
||||
|
||||
if (argc != 3) {
|
||||
fprintf(stderr, "hpet_fasync: device-name freq iterations\n");
|
||||
goto out;
|
||||
}
|
||||
|
||||
fd = open(argv[0], O_RDONLY);
|
||||
|
||||
if (fd < 0) {
|
||||
fprintf(stderr, "hpet_fasync: failed to open %s\n", argv[0]);
|
||||
return;
|
||||
}
|
||||
|
||||
|
||||
if ((fcntl(fd, F_SETOWN, getpid()) == 1) ||
|
||||
((value = fcntl(fd, F_GETFL)) == 1) ||
|
||||
(fcntl(fd, F_SETFL, value | O_ASYNC) == 1)) {
|
||||
fprintf(stderr, "hpet_fasync: fcntl failed\n");
|
||||
goto out;
|
||||
}
|
||||
|
||||
freq = atoi(argv[1]);
|
||||
iterations = atoi(argv[2]);
|
||||
|
||||
if (ioctl(fd, HPET_IRQFREQ, freq) < 0) {
|
||||
fprintf(stderr, "hpet_fasync: HPET_IRQFREQ failed\n");
|
||||
goto out;
|
||||
}
|
||||
|
||||
if (ioctl(fd, HPET_INFO, &info) < 0) {
|
||||
fprintf(stderr, "hpet_fasync: failed to get info\n");
|
||||
goto out;
|
||||
}
|
||||
|
||||
fprintf(stderr, "hpet_fasync: info.hi_flags 0x%lx\n", info.hi_flags);
|
||||
|
||||
if (info.hi_flags && (ioctl(fd, HPET_EPI, 0) < 0)) {
|
||||
fprintf(stderr, "hpet_fasync: HPET_EPI failed\n");
|
||||
goto out;
|
||||
}
|
||||
|
||||
if (ioctl(fd, HPET_IE_ON, 0) < 0) {
|
||||
fprintf(stderr, "hpet_fasync, HPET_IE_ON failed\n");
|
||||
goto out;
|
||||
}
|
||||
|
||||
for (i = 0; i < iterations; i++) {
|
||||
(void) pause();
|
||||
fprintf(stderr, "hpet_fasync: count = %d\n", hpet_sigio_count);
|
||||
}
|
||||
|
||||
out:
|
||||
signal(SIGIO, oldsig);
|
||||
|
||||
if (fd >= 0)
|
||||
close(fd);
|
||||
|
||||
return;
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user