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/*
* Isochronous Cycle Timer register test
*
* Copyright 2010 Stefan Richter <stefanr@s5r6.in-berlin.de>
* You may freely use, modify, and/or redistribute this program.
*
* Version imported into FFADO: v20100125, from
* http://user.in-berlin.de/~s5r6/linux1394/utils/
*
* This is a tool to test the reliability of one particular hardware feature
* of OHCI-1394 (FireWire) controllers: The isochronous cycle timer register.
* Some controllers do not access this register atomically, resulting in the
* cycle time seemingly jumping backwards occasionally.
*
* The firewire-ohci driver contains a workaround for unreliable isochronous
* cycle timer hardware, but this workaround is only activated for known bad
* hardware. You can use this tool to check whether you have an affected
* controller and firewire-ohci misses the necessary quirks entry.
*
* Usage:
*
* - Compile with "gcc test_cycle_time_v20100125.c".
*
* - Run with "sudo ./a.out /dev/fw0". Use a different /dev/fw* file if you
* have multiple controllers in your machine and want to test the second
* or following controller. Be patient, the test runs for 60 seconds.
*
* - If the very last lines of the resulting output contains only
* "0 cycleOffset backwards", "0 cycleCount backwards", "0 cycleSeconds
* backwards", then either the hardware works correctly or the driver
* already uses the workaround to compensate for a cycle timer hardware
* bug.
* But if the last lines of the output show one or more of the three cycle
* timer components having gone backwards, then the hardware is buggy and
* the driver does not yet contain the necessary quirks entry.
*
* In the latter case, please report your findings at
* <linux1394-devel@lists.sourceforge.net>. This mailinglist is open for
* posting without prior subscription. Please include the type and identifiers
* of your FireWire controller(s) in your posting, as obtained by "lspci -nn".
*
* Remark:
*
* This program optionally accesses /usr/share/misc/oui.db to translate the
* Globally Unique Identifier of the device that is associated with the chosen
* /dev/fw* to the company name of the device manufacturer. The oui.db file
* is not necessary for this program to work though. If you want you can
* generate oui.db this way:
* wget -O - http://standards.ieee.org/regauth/oui/oui.txt |
* grep -E '(base 16).*\w+.*$' |
* sed -e 's/\s*(base 16)\s*'/' /' > oui.db
* sudo mv oui.db /usr/share/misc/
* which will download ~2 MB data and result in a ~0.4 MB large oui.db.
*/
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include <linux/firewire-cdev.h>
#define TEST_DURATION 60 /* seconds */
static void cooked_ioctl(int fd, int req, void *arg, const char *name)
{
if (ioctl(fd, req, arg) < 0) {
fprintf(stderr, "Failed %s ioctl: %m\n", name);
exit(1);
}
}
static int rolled_over(__u32 c0, __u32 c1)
{
return (c0 >> 25) == 127 &&
(c1 >> 25) == 0 &&
(c0 >> 12 & 0x1fff) > 8000 - 3 &&
(c1 >> 12 & 0x1fff) < 0000 + 3;
}
static void print_ct(__u32 c, __u64 l)
{
printf("%03d %04d %04d - %lld.%06lld\n",
c >> 25, c >> 12 & 0x1fff, c & 0xfff,
l / 1000000, l % 1000000);
}
int main(int argc, char **argv)
{
if (argc != 2) {
fprintf(stderr, "Usage: %s /dev/fw[0-n]*\n", argv[0]);
return -1;
}
int fd = open(argv[1], O_RDWR);
if (fd < 0) {
fprintf(stderr, "Failed to open %s: %m\n", argv[0]);
return -1;
}
__u32 rom[4];
struct fw_cdev_event_bus_reset reset;
struct fw_cdev_get_info info = {
.rom = (unsigned long)rom,
.rom_length = sizeof(rom),
.bus_reset = (unsigned long)&reset,
};
cooked_ioctl(fd, FW_CDEV_IOC_GET_INFO, &info, "info");
if (reset.node_id != reset.local_node_id) {
fprintf(stderr, "Not a local node\n");
return -1;
}
struct fw_cdev_get_cycle_timer ct;
__u32 c0, c1;
__u64 l0, l1, end_time;
int i, j1, j2, j3;
cooked_ioctl(fd, FW_CDEV_IOC_GET_CYCLE_TIMER, &ct, "cycle timer");
c1 = ct.cycle_timer;
l1 = ct.local_time;
end_time = l1 + TEST_DURATION * 1000000ULL;
for (i = j1 = j2 = j3 = 0; l1 < end_time; i++) {
cooked_ioctl(fd, FW_CDEV_IOC_GET_CYCLE_TIMER, &ct, "cycle timer");
c0 = c1;
l0 = l1;
c1 = ct.cycle_timer;
l1 = ct.local_time;
if (c1 <= c0 && !rolled_over(c0, c1)) {
print_ct(c0, l0);
print_ct(c1, l1);
printf("\n");
j1++;
if ((c1 & 0xfffff000) < (c0 & 0xfffff000))
j2++;
if ((c1 & 0xfe000000) < (c0 & 0xfe000000))
j3++;
}
}
printf("--------------------------------------------------------\n\n");
fflush(stdout);
char buf[200];
sprintf(buf, "grep %06X /usr/share/misc/oui.db", rom[3] >> 8);
if (system(buf) != 0)
printf("%06X (unknown Vendor OUI)\n", rom[3] >> 8);
printf("\n%d cycleOffset backwards out of %d samples (%.2e)\n",
j1, i, (double)j1 / (double)i);
printf("%d cycleCount backwards (%.2e)\n",
j2, (double)j2 / (double)i);
printf("%d cycleSeconds backwards (%.2e)\n",
j3, (double)j3 / (double)i);
return 0;
}
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