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

[Dixit, Ashutosh]

On Fri, 27 Jan 2023 04:29:45 -0800, Kamil Konieczny wrote:
>
> Hi Ashutosh,

Hi Kamil,

I have addressed all comments. Please take a look at the latest
version:

https://patchwork.freedesktop.org/series/113436/

(not sure why Patchwork is creating new series each time).

Thanks.
--
Ashutosh

>
> On 2023-01-26 at 22:25:01 -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)
> >
> > Signed-off-by: Ashutosh Dixit <ashutosh.dixit at intel.com>
> > Reviewed-by: Riana Tauro <riana.tauro at intel.com>
> > ---
> >  tests/i915/i915_power.c | 80 +++++++++++++++++++++++++++++++++++++++++
> >  tests/meson.build       |  1 +
> >  2 files changed, 81 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..00993cdc846
> > --- /dev/null
> > +++ b/tests/i915/i915_power.c
> > @@ -0,0 +1,80 @@
> > +// 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 get_power(struct igt_power *pwr, const char *domain)
> ------------------------------------------------------------- ^
> You are not using this so delete it.

Done.

>
> > +{
> > +	const int sleep_duration_sec = 2;
> ----------------- ^
> Make this a parameter for function.

Done.

>
> > +	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 double measure_power(int i915, struct igt_power *pwr,
> > +			    const char *domain, bool load)
> ----------------------------------------------- ^
> This is confusing, delete this. Please avoid creating functions
> with boolean parameter, just do its work in place you will use
> true or false.

Done.

>
> > +{
> > +	const intel_ctx_t *ctx = intel_ctx_create_all_physical(i915);
> > +	uint64_t ahnd = get_reloc_ahnd(i915, ctx->id);
> > +	igt_spin_t *spin;
> > +	double mW;
> > +
> > +	gem_quiescent_gpu(i915);
> > +	if (load) {
> ------- ^
> Delete this if() and move spin creation after idle see below.

Done.

>
> > +		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);
> > +	}
> > +
> > +	mW = get_power(pwr, domain);
> > +	igt_info("Domain: %s, Load: %d, Measured power: %g mW\n", domain, load, mW);
> > +
> > +	igt_free_spins(i915);
> > +	put_ahnd(ahnd);
> > +	intel_ctx_destroy(i915, ctx);
> > +
> > +	return mW;
> > +}
> > +
> > +static void sanity(int i915, const char *domain)
> > +{
> > +	struct igt_power pwr;
> > +	double idle, busy;
> > +
> > +	igt_require(!igt_power_open(i915, &pwr, domain));
> > +	idle = measure_power(i915, &pwr, domain, false);
> > +	busy = measure_power(i915, &pwr, domain, true);
> > +	igt_power_close(&pwr);
> > +
> > +	igt_assert(idle >= 0 && busy > 0 && busy >= idle);
> ------------------------------------------------ ^
> imho this should be "busy > idle" ?

Done.

>
> Merge sanity() with measure_power() so it will be simple.
> This should look like:
>	// check require
>	// prepare ctx and other
>	idle = get_power(pwr, 2 * USEC_PER_SEC); /* 2 seconds */
>	// create spin and wait until it will run
>	busy = get_power(pwr, 2 * USEC_PER_SEC); /* 2 seconds */
>	// cleanup after spin, ctx, and other
>	// print info what was measured, domain, power and time used
>	// assert

Done.

>
> > +}
> > +
> > +igt_main
> > +{
> > +	int i915;
> > +
> > +	igt_fixture {
> > +		i915 = drm_open_driver_master(DRIVER_INTEL);
> > +	}
> > +
> > +	igt_describe("Sanity check power measurement");
> > +	igt_subtest("sanity") {
> > +		sanity(i915, "gpu");
> ----------------------------- ^
> Do you plan other domains, maybe multi-gpu like gpu-#number ?

Future patch.

>
> Regards,
> Kamil
>
> > +	}
> > +
> > +	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
> >