[igt-dev] [PATCH i-g-t 1/2] i915/i915_power: Sanity check power measurement

[Dixit, Ashutosh]

On Fri, 27 Jan 2023 08:46:03 -0800, Kamil Konieczny wrote:
>
> Hi Ashutosh,
>
> looks much better, few small nits left, see below.
>
> On 2023-01-27 at 08:08:12 -0800, Ashutosh Dixit wrote:
> > Add a test to sanity check power measurement on integrated/discrete by
> > requiring power under load to be > 0 and >= idle power.
> >
> > v2: Code reorganization (Kamil K)
> > v3: More code reorganization (Kamil K)
> >
> > Signed-off-by: Ashutosh Dixit <ashutosh.dixit at intel.com>
> > Reviewed-by: Riana Tauro <riana.tauro at intel.com>
> > ---
> >  tests/i915/i915_power.c | 70 +++++++++++++++++++++++++++++++++++++++++
> >  tests/meson.build       |  1 +
> >  2 files changed, 71 insertions(+)
> >  create mode 100644 tests/i915/i915_power.c
> >
> > diff --git a/tests/i915/i915_power.c b/tests/i915/i915_power.c
> > new file mode 100644
> > index 00000000000..533cf769b54
> > --- /dev/null
> > +++ b/tests/i915/i915_power.c
> > @@ -0,0 +1,70 @@
> > +// SPDX-License-Identifier: MIT
> > +/*
> > + * Copyright © 2023 Intel Corporation
> > + */
> > +
> > +#include "igt.h"
> > +#include "i915/gem.h"
> > +#include "igt_power.h"
> > +
> > +IGT_TEST_DESCRIPTION("i915 power measurement tests");
> > +
> > +static double measure_power(struct igt_power *pwr, int sleep_duration_sec)
> ----------------------------------------------------- ^
> unsigned int

No this is double, see igt_power_get_mW.

>
> > +{
> > +	struct power_sample sample[2];
> > +
> > +	igt_power_get_energy(pwr, &sample[0]);
> > +	usleep(sleep_duration_sec * USEC_PER_SEC);
> > +	igt_power_get_energy(pwr, &sample[1]);
> > +
> > +	return igt_power_get_mW(pwr, &sample[0], &sample[1]);
> > +}
> > +
> > +static void sanity(int i915)
> > +{
> > +	const intel_ctx_t *ctx;
> > +	struct igt_power pwr;
> > +	double idle, busy;
> > +	igt_spin_t *spin;
> > +	uint64_t ahnd;
> > +
> > +	/* Idle power */
> > +	igt_require(!igt_power_open(i915, &pwr, "gpu"));
> > +	gem_quiescent_gpu(i915);
> > +	idle = measure_power(&pwr, 2);
> ---------------------------------- ^
>
> > +
> > +	/* Busy power */
> > +	ctx = intel_ctx_create_all_physical(i915);
> > +	ahnd = get_reloc_ahnd(i915, ctx->id);
> > +	spin = igt_spin_new(i915, .ahnd = ahnd, .ctx = ctx,
> > +			    .engine = ALL_ENGINES,
> > +			    .flags = IGT_SPIN_POLL_RUN);
> > +	/* Wait till at least one spinner starts */
> > +	igt_spin_busywait_until_started(spin);
> > +	busy = measure_power(&pwr, 2);
> ---------------------------------- ^
> Make it define or const as you are using it twice and this
> should be the same.

Will fix this up.

>
> With that fixed:
> Reviewed-by: Kamil Konieczny <kamil.konieczny at linux.intel.com>

Thanks!

>
> --
> Kamil
>
> > +	igt_free_spins(i915);
> > +	put_ahnd(ahnd);
> > +	intel_ctx_destroy(i915, ctx);
> > +	igt_power_close(&pwr);
> > +
> > +	igt_info("Measured power: idle: %g mW, busy: %g mW\n", idle, busy);
> > +	igt_assert(idle >= 0 && busy > 0 && busy > idle);
> > +}
> > +
> > +igt_main
> > +{
> > +	int i915;
> > +
> > +	igt_fixture {
> > +		i915 = drm_open_driver_master(DRIVER_INTEL);
> > +	}
> > +
> > +	igt_describe("Sanity check gpu power measurement");
> > +	igt_subtest("sanity") {
> > +		sanity(i915);
> > +	}
> > +
> > +	igt_fixture {
> > +		close(i915);
> > +	}
> > +}
> > diff --git a/tests/meson.build b/tests/meson.build
> > index cce9d89e1c8..d93a07c9ed6 100644
> > --- a/tests/meson.build
> > +++ b/tests/meson.build
> > @@ -213,6 +213,7 @@ i915_progs = [
> >	'i915_pm_dc',
> >	'i915_pm_rps',
> >	'i915_pm_sseu',
> > +	'i915_power',
> >	'i915_query',
> >	'i915_selftest',
> >	'i915_suspend',
> > --
> > 2.38.0
> >