[Intel-gfx] [PATCH i-g-t 2/2] i915_guc_pc: Add some basic SLPC igt tests

[Rodrigo Vivi]

On Fri, Mar 24, 2023 at 03:49:59PM -0700, Vinay Belgaumkar wrote:
> Use the xe_guc_pc test for i915 as well. Validate basic
> api for GT freq control. Also test interaction with GT
> reset. We skip rps tests with SLPC enabled, this will
> re-introduce some coverage. SLPC selftests are already
> covering some other workload related scenarios.
> 
> Signed-off-by: Rodrigo Vivi <rodrigo.vivi at intel.com>

you probably meant 'Cc:'

> Signed-off-by: Vinay Belgaumkar <vinay.belgaumkar at intel.com>
> ---
>  tests/i915/i915_guc_pc.c | 151 +++++++++++++++++++++++++++++++++++++++
>  tests/meson.build        |   1 +
>  2 files changed, 152 insertions(+)
>  create mode 100644 tests/i915/i915_guc_pc.c
> 
> diff --git a/tests/i915/i915_guc_pc.c b/tests/i915/i915_guc_pc.c
> new file mode 100644
> index 00000000..f9a0ed83
> --- /dev/null
> +++ b/tests/i915/i915_guc_pc.c

since 'guc_pc' is not a thing in i915 I'm afraid this will cause
confusion later.

I know, guc_slpc also doesn't make a lot of sense here...

Should we then try to move this code to the 'tests/i915/i915_pm_rps.c'
or maybe name it i915_pm_freq_api or something like that?

> @@ -0,0 +1,151 @@
> +// SPDX-License-Identifier: MIT
> +/*
> + * Copyright © 2023 Intel Corporation
> + */
> +
> +#include <dirent.h>
> +#include <errno.h>
> +#include <fcntl.h>
> +#include <inttypes.h>
> +#include <stdlib.h>
> +#include <sys/stat.h>
> +#include <sys/syscall.h>
> +#include <sys/types.h>
> +#include <unistd.h>
> +
> +#include "drmtest.h"
> +#include "i915/gem.h"
> +#include "igt_sysfs.h"
> +#include "igt.h"
> +
> +IGT_TEST_DESCRIPTION("Test GuC PM features like SLPC and its interactions");
> +/*
> + * Too many intermediate components and steps before freq is adjusted
> + * Specially if workload is under execution, so let's wait 100 ms.
> + */
> +#define ACT_FREQ_LATENCY_US 100000
> +
> +static uint32_t get_freq(int dirfd, uint8_t id)
> +{
> +	uint32_t val;
> +
> +	igt_require(igt_sysfs_rps_scanf(dirfd, id, "%u", &val) == 1);
> +
> +	return val;
> +}
> +
> +static int set_freq(int dirfd, uint8_t id, uint32_t val)
> +{
> +	return igt_sysfs_rps_printf(dirfd, id, "%u", val);
> +}
> +
> +static void test_freq_basic_api(int dirfd, int gt)
> +{
> +	uint32_t rpn, rp0, rpe;
> +
> +	/* Save frequencies */
> +	rpn = get_freq(dirfd, RPS_RPn_FREQ_MHZ);
> +	rp0 = get_freq(dirfd, RPS_RP0_FREQ_MHZ);
> +	rpe = get_freq(dirfd, RPS_RP1_FREQ_MHZ);
> +	igt_info("System min freq: %dMHz; max freq: %dMHz\n", rpn, rp0);
> +
> +	/*
> +	 * Negative bound tests
> +	 * RPn is the floor
> +	 * RP0 is the ceiling
> +	 */
> +	igt_assert(set_freq(dirfd, RPS_MIN_FREQ_MHZ, rpn - 1) < 0);
> +	igt_assert(set_freq(dirfd, RPS_MIN_FREQ_MHZ, rp0 + 1) < 0);
> +	igt_assert(set_freq(dirfd, RPS_MIN_FREQ_MHZ, rpn - 1) < 0);
> +	igt_assert(set_freq(dirfd, RPS_MAX_FREQ_MHZ, rp0 + 1) < 0);
> +
> +	/* Assert min requests are respected from rp0 to rpn */
> +	igt_assert(set_freq(dirfd, RPS_MIN_FREQ_MHZ, rp0) > 0);
> +	igt_assert(get_freq(dirfd, RPS_MIN_FREQ_MHZ) == rp0);
> +	igt_assert(set_freq(dirfd, RPS_MIN_FREQ_MHZ, rpe) > 0);
> +	igt_assert(get_freq(dirfd, RPS_MIN_FREQ_MHZ) == rpe);
> +	igt_assert(set_freq(dirfd, RPS_MIN_FREQ_MHZ, rpn) > 0);
> +	igt_assert(get_freq(dirfd, RPS_MIN_FREQ_MHZ) == rpn);
> +
> +	/* Assert max requests are respected from rpn to rp0 */
> +	igt_assert(set_freq(dirfd, RPS_MAX_FREQ_MHZ, rpn) > 0);
> +	igt_assert(get_freq(dirfd, RPS_MAX_FREQ_MHZ) == rpn);
> +	igt_assert(set_freq(dirfd, RPS_MAX_FREQ_MHZ, rpe) > 0);
> +	igt_assert(get_freq(dirfd, RPS_MAX_FREQ_MHZ) == rpe);
> +	igt_assert(set_freq(dirfd, RPS_MAX_FREQ_MHZ, rp0) > 0);
> +	igt_assert(get_freq(dirfd, RPS_MAX_FREQ_MHZ) == rp0);
> +
> +}
> +
> +static void test_reset(int i915, int dirfd, int gt)
> +{
> +	uint32_t rpn = get_freq(dirfd, RPS_RPn_FREQ_MHZ);
> +	int fd;
> +
> +	igt_assert(set_freq(dirfd, RPS_MIN_FREQ_MHZ, rpn) > 0);
> +	igt_assert(set_freq(dirfd, RPS_MAX_FREQ_MHZ, rpn) > 0);
> +	usleep(ACT_FREQ_LATENCY_US);
> +	igt_assert(get_freq(dirfd, RPS_MIN_FREQ_MHZ) == rpn);
> +
> +	/* Manually trigger a GT reset */
> +	fd = igt_debugfs_gt_open(i915, gt, "reset", O_WRONLY);
> +	igt_require(fd >= 0);
> +	igt_ignore_warn(write(fd, "1\n", 2));
> +	close(fd);
> +
> +	igt_assert(get_freq(dirfd, RPS_MIN_FREQ_MHZ) == rpn);
> +	igt_assert(get_freq(dirfd, RPS_MAX_FREQ_MHZ) == rpn);
> +}
> +
> +igt_main
> +{
> +	int i915 = -1;
> +	uint32_t *stash_min, *stash_max;
> +
> +	igt_fixture {
> +		int num_gts, dirfd, gt;
> +
> +		i915 = drm_open_driver(DRIVER_INTEL);
> +		igt_require_gem(i915);
> +		/* i915_pm_rps already covers execlist path */
> +		igt_require(gem_using_guc_submission(i915));
> +
> +		num_gts = igt_sysfs_get_num_gt(i915);
> +		stash_min = (uint32_t*)malloc(sizeof(uint32_t) * num_gts);
> +		stash_max = (uint32_t*)malloc(sizeof(uint32_t) * num_gts);
> +
> +		/* Save curr min and max across GTs */
> +		for_each_sysfs_gt_dirfd(i915, dirfd, gt) {
> +			stash_min[gt] = get_freq(dirfd, RPS_MIN_FREQ_MHZ);
> +			stash_max[gt] = get_freq(dirfd, RPS_MAX_FREQ_MHZ);
> +		}
> +	}
> +
> +	igt_describe("Test basic API for controlling min/max GT frequency");
> +	igt_subtest_with_dynamic_f("freq-basic-api") {
> +		int dirfd, gt;
> +
> +		for_each_sysfs_gt_dirfd(i915, dirfd, gt)
> +			igt_dynamic_f("gt%u", gt)
> +				test_freq_basic_api(dirfd, gt);
> +	}
> +
> +	igt_describe("Test basic freq API works after a reset");
> +	igt_subtest_with_dynamic_f("freq-reset") {
> +		int dirfd, gt;
> +
> +		for_each_sysfs_gt_dirfd(i915, dirfd, gt)
> +			igt_dynamic_f("gt%u", gt)
> +				test_reset(i915, dirfd, gt);
> +	}
> +
> +	igt_fixture {
> +		int dirfd, gt;
> +		/* Restore frequencies */
> +		for_each_sysfs_gt_dirfd(i915, dirfd, gt) {
> +			igt_assert(set_freq(dirfd, RPS_MAX_FREQ_MHZ, stash_max[gt]) > 0);
> +			igt_assert(set_freq(dirfd, RPS_MIN_FREQ_MHZ, stash_min[gt]) > 0);
> +		}
> +		close(i915);
> +	}
> +}
> diff --git a/tests/meson.build b/tests/meson.build
> index 7d2168be..3ebd3bf2 100644
> --- a/tests/meson.build
> +++ b/tests/meson.build
> @@ -202,6 +202,7 @@ i915_progs = [
>  	'gem_workarounds',
>  	'i915_fb_tiling',
>  	'i915_getparams_basic',
> +	'i915_guc_pc',
>  	'i915_hangman',
>  	'i915_hwmon',
>  	'i915_module_load',
> -- 
> 2.38.1
>