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Commit 843b20bc authored by Alexandre Belloni's avatar Alexandre Belloni Committed by Shuah Khan (Samsung OSG)
Browse files

selftests: timers: move PIE tests out of rtctest 



Since commit 6610e089 ("RTC: Rework RTC code to use timerqueue for
events"), PIE are completely handled using hrtimers, without actually using
any underlying hardware RTC.

Move PIE testing out of rtctest. It still depends on the presence of an RTC
(to access the device file) but doesn't depend on it actually working.

Signed-off-by: default avatarAlexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: default avatarShuah Khan (Samsung OSG) <shuah@kernel.org>
parent dd4b16b4

tools/testing/selftests/timers/.gitignore

+1 −0
Original line number Diff line number Diff line
@@ -9,6 +9,7 @@ nanosleep 
nsleep-lat

posix_timers

raw_skew

rtcpie

rtctest

set-2038

set-tai

tools/testing/selftests/timers/Makefile

+1 −1
Original line number Diff line number Diff line
@@ -5,7 +5,7 @@ LDFLAGS += -lrt -lpthread -lm 
# these are all "safe" tests that don't modify

# system time or require escalated privileges

TEST_GEN_PROGS = posix_timers nanosleep nsleep-lat set-timer-lat mqueue-lat \

	     inconsistency-check raw_skew threadtest rtctest

	     inconsistency-check raw_skew threadtest rtctest rtcpie



DESTRUCTIVE_TESTS = alarmtimer-suspend valid-adjtimex adjtick change_skew \

		      skew_consistency clocksource-switch freq-step leap-a-day \

tools/testing/selftests/timers/rtcpie.c

0 → 100644
+132 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0

/*

 * Real Time Clock Periodic Interrupt test program

 *

 * Since commit 6610e0893b8bc ("RTC: Rework RTC code to use timerqueue for

 * events"), PIE are completely handled using hrtimers, without actually using

 * any underlying hardware RTC.

 *

 */



#include <stdio.h>

#include <linux/rtc.h>

#include <sys/ioctl.h>

#include <sys/time.h>

#include <sys/types.h>

#include <fcntl.h>

#include <unistd.h>

#include <stdlib.h>

#include <errno.h>



/*

 * This expects the new RTC class driver framework, working with

 * clocks that will often not be clones of what the PC-AT had.

 * Use the command line to specify another RTC if you need one.

 */

static const char default_rtc[] = "/dev/rtc0";



int main(int argc, char **argv)

{

	int i, fd, retval, irqcount = 0;

	unsigned long tmp, data;

	const char *rtc = default_rtc;

	struct timeval start, end, diff;



	switch (argc) {

	case 2:

		rtc = argv[1];

		/* FALLTHROUGH */

	case 1:

		break;

	default:

		fprintf(stderr, "usage:  rtctest [rtcdev] [d]\n");

		return 1;

	}



	fd = open(rtc, O_RDONLY);



	if (fd ==  -1) {

		perror(rtc);

		exit(errno);

	}



	/* Read periodic IRQ rate */

	retval = ioctl(fd, RTC_IRQP_READ, &tmp);

	if (retval == -1) {

		/* not all RTCs support periodic IRQs */

		if (errno == EINVAL) {

			fprintf(stderr, "\nNo periodic IRQ support\n");

			goto done;

		}

		perror("RTC_IRQP_READ ioctl");

		exit(errno);

	}

	fprintf(stderr, "\nPeriodic IRQ rate is %ldHz.\n", tmp);



	fprintf(stderr, "Counting 20 interrupts at:");

	fflush(stderr);



	/* The frequencies 128Hz, 256Hz, ... 8192Hz are only allowed for root. */

	for (tmp=2; tmp<=64; tmp*=2) {



		retval = ioctl(fd, RTC_IRQP_SET, tmp);

		if (retval == -1) {

			/* not all RTCs can change their periodic IRQ rate */

			if (errno == EINVAL) {

				fprintf(stderr,

					"\n...Periodic IRQ rate is fixed\n");

				goto done;

			}

			perror("RTC_IRQP_SET ioctl");

			exit(errno);

		}



		fprintf(stderr, "\n%ldHz:\t", tmp);

		fflush(stderr);



		/* Enable periodic interrupts */

		retval = ioctl(fd, RTC_PIE_ON, 0);

		if (retval == -1) {

			perror("RTC_PIE_ON ioctl");

			exit(errno);

		}



		for (i=1; i<21; i++) {

			gettimeofday(&start, NULL);

			/* This blocks */

			retval = read(fd, &data, sizeof(unsigned long));

			if (retval == -1) {

				perror("read");

				exit(errno);

			}

			gettimeofday(&end, NULL);

			timersub(&end, &start, &diff);

			if (diff.tv_sec > 0 ||

			    diff.tv_usec > ((1000000L / tmp) * 1.10)) {

				fprintf(stderr, "\nPIE delta error: %ld.%06ld should be close to 0.%06ld\n",

				       diff.tv_sec, diff.tv_usec,

				       (1000000L / tmp));

				fflush(stdout);

				exit(-1);

			}



			fprintf(stderr, " %d",i);

			fflush(stderr);

			irqcount++;

		}



		/* Disable periodic interrupts */

		retval = ioctl(fd, RTC_PIE_OFF, 0);

		if (retval == -1) {

			perror("RTC_PIE_OFF ioctl");

			exit(errno);

		}

	}



done:

	fprintf(stderr, "\n\n\t\t\t *** Test complete ***\n");



	close(fd);



	return 0;

}

tools/testing/selftests/timers/rtctest.c

+4 −79
Original line number Diff line number Diff line
@@ -94,10 +94,9 @@ static int compare_dates(struct rtc_time *a, struct rtc_time *b) 
int main(int argc, char **argv)

{

	int i, fd, retval, irqcount = 0, dangerous = 0;

	unsigned long tmp, data;

	unsigned long data;

	struct rtc_time rtc_tm;

	const char *rtc = default_rtc;

	struct timeval start, end, diff;



	switch (argc) {

	case 3:
@@ -211,7 +210,7 @@ int main(int argc, char **argv) 
		if (errno == EINVAL) {

			fprintf(stderr,

				"\n...Alarm IRQs not supported.\n");

			goto test_PIE;

			goto test_DATE;

		}



		perror("RTC_ALM_SET ioctl");
@@ -224,7 +223,7 @@ int main(int argc, char **argv) 
		if (errno == EINVAL) {

			fprintf(stderr,

					"\n...EINVAL reading current alarm setting.\n");

			goto test_PIE;

			goto test_DATE;

		}

		perror("RTC_ALM_READ ioctl");

		exit(errno);
@@ -239,7 +238,7 @@ int main(int argc, char **argv) 
		if (errno == EINVAL || errno == EIO) {

			fprintf(stderr,

				"\n...Alarm IRQs not supported.\n");

			goto test_PIE;

			goto test_DATE;

		}



		perror("RTC_AIE_ON ioctl");
@@ -264,80 +263,6 @@ int main(int argc, char **argv) 
		exit(errno);

	}



test_PIE:

	/* Read periodic IRQ rate */

	retval = ioctl(fd, RTC_IRQP_READ, &tmp);

	if (retval == -1) {

		/* not all RTCs support periodic IRQs */

		if (errno == EINVAL) {

			fprintf(stderr, "\nNo periodic IRQ support\n");

			goto test_DATE;

		}

		perror("RTC_IRQP_READ ioctl");

		exit(errno);

	}

	fprintf(stderr, "\nPeriodic IRQ rate is %ldHz.\n", tmp);



	fprintf(stderr, "Counting 20 interrupts at:");

	fflush(stderr);



	/* The frequencies 128Hz, 256Hz, ... 8192Hz are only allowed for root. */

	for (tmp=2; tmp<=64; tmp*=2) {



		retval = ioctl(fd, RTC_IRQP_SET, tmp);

		if (retval == -1) {

			/* not all RTCs can change their periodic IRQ rate */

			if (errno == EINVAL) {

				fprintf(stderr,

					"\n...Periodic IRQ rate is fixed\n");

				goto test_DATE;

			}

			perror("RTC_IRQP_SET ioctl");

			exit(errno);

		}



		fprintf(stderr, "\n%ldHz:\t", tmp);

		fflush(stderr);



		/* Enable periodic interrupts */

		retval = ioctl(fd, RTC_PIE_ON, 0);

		if (retval == -1) {

			perror("RTC_PIE_ON ioctl");

			exit(errno);

		}



		for (i=1; i<21; i++) {

			gettimeofday(&start, NULL);

			/* This blocks */

			retval = read(fd, &data, sizeof(unsigned long));

			if (retval == -1) {

				perror("read");

				exit(errno);

			}

			gettimeofday(&end, NULL);

			timersub(&end, &start, &diff);

			if (diff.tv_sec > 0 ||

			    diff.tv_usec > ((1000000L / tmp) * 1.10)) {

				fprintf(stderr, "\nPIE delta error: %ld.%06ld should be close to 0.%06ld\n",

				       diff.tv_sec, diff.tv_usec,

				       (1000000L / tmp));

				fflush(stdout);

				exit(-1);

			}



			fprintf(stderr, " %d",i);

			fflush(stderr);

			irqcount++;

		}



		/* Disable periodic interrupts */

		retval = ioctl(fd, RTC_PIE_OFF, 0);

		if (retval == -1) {

			perror("RTC_PIE_OFF ioctl");

			exit(errno);

		}

	}



test_DATE:

	if (!dangerous)

		goto done;