[PATCH i-g-t] tests: Adding kms_dp_aux_dev test.

[Jani Nikula]

On Tue, 29 Sep 2015, Rafael Antognolli <rafael.antognolli at intel.com> wrote:
> This new test makes some basic testing on the proposed drm_dp_aux_dev
> interface. If the feature is enabled and the drm_dp_aux_dev class is
> present, it will check for available DP aux channels and test them for:
> 	- basic seek to 0 and read 1 byte
> 	- seek to the last address and read, to confirm 0 is returned
> 	- seek one more byte and confirm that EINVAL is returned
> 	- try to read 64 bytes when at 8 bytes from the end of the
> 	address space
> 	- try to read 64 bytes at the address 0.
>
> So far, no write checks are done.

Side note, it would be useful to have a tool under tools/ to
read/write/dump DPCD registers.

On the one hand, I think it would be trivial to bolt this into the
intel_reg tool. One could add a dpcd "port" (kind of like namespace) and
all of it would work very nicely. Everything is there already.

On the other hand, this perhaps should be a standalone tool, as it's
driver agnostic stuff. But it would mean quite a bit of code
duplication, and we might end up with the mess we had before intel_reg -
lots of tools for various things with slightly different feature sets,
yet all of them doing roughly the same thing.

BR,
Jani.


>
> Signed-off-by: Rafael Antognolli <rafael.antognolli at intel.com>
> ---
>  tests/.gitignore       |   1 +
>  tests/Makefile.sources |   1 +
>  tests/kms_dp_aux_dev.c | 134 +++++++++++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 136 insertions(+)
>  create mode 100644 tests/kms_dp_aux_dev.c
>
> diff --git a/tests/.gitignore b/tests/.gitignore
> index dc8bb53..efdad75 100644
> --- a/tests/.gitignore
> +++ b/tests/.gitignore
> @@ -127,6 +127,7 @@ kms_3d
>  kms_addfb_basic
>  kms_crtc_background_color
>  kms_cursor_crc
> +kms_dp_aux_dev
>  kms_draw_crc
>  kms_fbc_crc
>  kms_fbcon_fbt
> diff --git a/tests/Makefile.sources b/tests/Makefile.sources
> index 2e2e088..dc07737 100644
> --- a/tests/Makefile.sources
> +++ b/tests/Makefile.sources
> @@ -64,6 +64,7 @@ TESTS_progs_M = \
>  	gem_write_read_ring_switch \
>  	kms_addfb_basic \
>  	kms_cursor_crc \
> +	kms_dp_aux_dev \
>  	kms_draw_crc \
>  	kms_fbc_crc \
>  	kms_fbcon_fbt \
> diff --git a/tests/kms_dp_aux_dev.c b/tests/kms_dp_aux_dev.c
> new file mode 100644
> index 0000000..aab8c95
> --- /dev/null
> +++ b/tests/kms_dp_aux_dev.c
> @@ -0,0 +1,134 @@
> +/*
> + * Copyright © 2015 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.
> + */
> +
> +/** @file kms_dp_aux_dev.c
> + *
> + * This is a test of functionality of drm_dp_aux_dev.
> + */
> +
> +#include "igt.h"
> +#include <stdlib.h>
> +#include <stdio.h>
> +#include <dirent.h>
> +#include <unistd.h>
> +#include <sys/stat.h>
> +#include <fcntl.h>
> +
> +#include <drm.h>
> +
> +#define DRM_DP_AUX_SYSFS_PATH "/sys/class/drm_dp_aux_dev"
> +
> +IGT_TEST_DESCRIPTION("Test of drm_aux_dev nodes.");
> +
> +static void drm_dp_aux_test(const char *devname)
> +{
> +	char basedir[] = "/dev/";
> +	char name[256 + sizeof(basedir)];
> +	off_t address;
> +	uint8_t buf;
> +	uint8_t bigbuf[64];
> +	int fd;
> +
> +	ssize_t res;
> +
> + 	snprintf(name, sizeof(name), "%s%s", basedir, devname);
> + 	igt_info("Running test on %s\n", name);
> + 
> +	/* Check if this DP aux channel is connected before continuing tests */
> + 	fd = open(name, O_RDONLY);
> + 	igt_assert_lte(0, fd);
> + 	address = lseek(fd, 0x0, SEEK_SET);
> + 	igt_assert_eq(address, 0x0);
> + 	res = read(fd, &buf, sizeof(buf));
> + 	igt_skip_on(res < 0 && errno == ETIMEDOUT);
> + 
> +
> +	/* Channel is connected, start tests */
> + 	igt_assert_eq(res, sizeof(buf));
> +
> +	/* Test reads on the end of address space */
> +	address = lseek(fd, 0, SEEK_END);
> +	igt_assert_eq(address, 1 << 20);
> +	res = read(fd, &buf, sizeof(buf));
> +	igt_assert_eq(res, 0);
> +
> +	address = lseek(fd, 1, SEEK_CUR);
> +	igt_assert_eq(address, -1);
> +	igt_assert_eq(errno, EINVAL);
> +
> +	address = lseek(fd, -8, SEEK_END);
> +	res = read(fd, bigbuf, sizeof(bigbuf));
> +	igt_assert_eq(res, 8);
> +
> +	/* Test reading more than 16 bytes at once */
> +	address = lseek(fd, 0, SEEK_SET);
> +	res = read(fd, bigbuf, sizeof(bigbuf));
> +	igt_assert_eq(res, sizeof(bigbuf));
> +}
> +
> +static void for_each_dp_aux(DIR *dir)
> +{
> +	int count = 0;
> +	struct dirent *dirent;
> +
> +	if (!dir)
> +		return;
> +
> +	rewinddir(dir);
> +	while ((dirent = readdir(dir))) {
> +		if (dirent->d_name[0] == '.')
> +			continue;
> +
> +		count++;
> +		igt_subtest(dirent->d_name)
> +			drm_dp_aux_test(dirent->d_name);
> +	}
> +
> +	closedir(dir);
> +}
> +
> +igt_main
> +{
> +	struct stat st;
> +	DIR *dir = NULL;
> +
> +	igt_fixture {
> +		int count = 0;
> +		struct dirent *dirent;
> +
> +		igt_require(stat(DRM_DP_AUX_SYSFS_PATH, &st) == 0);
> +		igt_require(S_ISDIR(st.st_mode));
> +
> +		dir = opendir(DRM_DP_AUX_SYSFS_PATH);
> +		igt_require(dir);
> +
> +		while ((dirent = readdir(dir))) {
> +			if (dirent->d_name[0] != '.')
> +				count++;
> +		}
> +
> +		igt_require(count > 0);
> +	}
> +
> +	for_each_dp_aux(dir);
> +}
> -- 
> 2.4.3
>
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-- 
Jani Nikula, Intel Open Source Technology Center