[Intel-gfx] [PATCH] tests: rc6 residency test

[Ben Widawsky]

On Tue, 27 Mar 2012 18:59:42 -0700
Ben Widawsky <ben at bwidawsk.net> wrote:

> This is meant to test the sysfs entry for showing rc6 residency in
> milliseconds. Remember, sysfs is a permanent interface.
> 
> v2: use new get_card interface to try "all" devices
> check rc6p and rc6pp in addition to rc6
> 
> v3: rename rc6_residency.c to sysfs_rc6_residency.c
> print better error messages
> skip test if rc6 isn't enabled
> 
> Signed-off-by: Ben Widawsky <benjamin.widawsky at intel.com>
> ---
>  lib/drmtest.h               |    1 +
>  tests/Makefile.am           |    1 +
>  tests/sysfs_rc6_residency.c |  107 +++++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 109 insertions(+)
>  create mode 100644 tests/sysfs_rc6_residency.c
> 
> diff --git a/lib/drmtest.h b/lib/drmtest.h
> index 96fbf1a..42f238c 100644
> --- a/lib/drmtest.h
> +++ b/lib/drmtest.h
> @@ -35,6 +35,7 @@
>  #include "xf86drm.h"
>  #include "intel_batchbuffer.h"
>  
> +int drm_get_card(int master);
>  int drm_open_any(void);
>  int drm_open_any_master(void);
>  
> diff --git a/tests/Makefile.am b/tests/Makefile.am
> index 6544ec7..9c3b058 100644
> --- a/tests/Makefile.am
> +++ b/tests/Makefile.am
> @@ -56,6 +56,7 @@ TESTS_progs = \
>  	drm_vma_limiter_cpu \
>  	drm_vma_limiter_gtt \
>  	drm_vma_limiter_cached \
> +	sysfs_rc6_residency \
>  	$(NULL)
>  
>  # IMPORTANT: The ZZ_ tests need to be run last!
> diff --git a/tests/sysfs_rc6_residency.c b/tests/sysfs_rc6_residency.c
> new file mode 100644
> index 0000000..1772c87
> --- /dev/null
> +++ b/tests/sysfs_rc6_residency.c
> @@ -0,0 +1,107 @@
> +/*
> + * Copyright © 2012 Intel Corporation
> + *
> + * 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 (including the next
> + * paragraph) 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.
> + *
> + * Authors:
> + *    Ben Widawsky <ben at bwidawsk.net>
> + *
> + */
> +
> +#define _GNU_SOURCE
> +#include <stdio.h>
> +#include <stdlib.h>
> +#include <string.h>
> +#include <unistd.h>
> +#include "drmtest.h"
> +
> +#define SLEEP_DURATION 3000 // in milliseconds
> +#define RC6_FUDGE 900 // in milliseconds
> +
> +static unsigned int readit(const char *path)
> +{
> +	unsigned int ret;
> +
> +	FILE *file;
> +	file = fopen(path, "r");
> +	if (file == NULL) {
> +		fprintf(stderr, "Couldn't open %s (%d)\n", path, errno);
> +		abort();
> +	}
> +	fscanf(file, "%u", &ret);
> +	fclose(file);
> +
> +	return ret;
> +}
> +
> +int main(int argc, char *argv[])
> +{
> +	const int device = drm_get_card(0);
> +	char *path, *pathp, *pathpp;
> +	int fd, ret;
> +	unsigned int value1, value1p, value1pp, value2, value2p, value2pp;
> +	int diff;
> +
> +	/* Use drm_open_any to verify device existence */
> +	fd = drm_open_any();
> +	close(fd);
> +
> +	ret = asprintf(&path, "/sys/class/drm/card%d/power/rc6", device);
> +	assert(ret != -1);

Copy+paste bug here. Imagine it says rc6_enabled instead of rc6.

> +
> +	if (readit(path) == 0)
> +		exit(EXIT_SUCCESS);
> +
> +	ret = asprintf(&path, "/sys/class/drm/card%d/power/rc6", device);
> +	assert(ret != -1);
> +	ret = asprintf(&pathp, "/sys/class/drm/card%d/power/rc6p", device);
> +	assert(ret != -1);
> +	ret = asprintf(&pathpp, "/sys/class/drm/card%d/power/rc6pp", device);
> +	assert(ret != -1);
> +
> +	value1 = readit(path);
> +	value1p = readit(pathp);
> +	value1pp = readit(pathpp);
> +	sleep(SLEEP_DURATION / 1000);
> +	value2 = readit(path);
> +	value2p = readit(pathp);
> +	value2pp = readit(pathpp);
> +
> +	free(pathpp);
> +	free(pathp);
> +	free(path);
> +
> +	diff = (value2pp - value1pp) +
> +		(value2p - value1p) +
> +		(value2 - value1);
> +
> +	if (diff > (SLEEP_DURATION + RC6_FUDGE)) {
> +		fprintf(stderr, "Diff was too high. That is unpossible\n");
> +		exit(EXIT_FAILURE);
> +	}
> +	if (diff < (SLEEP_DURATION - RC6_FUDGE)) {
> +		fprintf(stderr, "GPU was not in RC6 long enough. Check that "
> +				"the GPU is as idle as possible (ie. no X, "
> +				"running and running no other tests)\n");
> +		exit(EXIT_FAILURE);
> +	}
> +
> +	exit(EXIT_SUCCESS);
> +}