[PATCH] drm/i915/selftests: Implement Frequency Check for Energy Reading Validation

[Gupta, Anshuman]

> -----Original Message-----
> From: Anirban, Sk <sk.anirban at intel.com>
> Sent: Tuesday, September 17, 2024 2:50 PM
> To: intel-gfx at lists.freedesktop.org
> Cc: Gupta, Anshuman <anshuman.gupta at intel.com>; Anirban, Sk
> <sk.anirban at intel.com>
> Subject: [PATCH] drm/i915/selftests: Implement Frequency Check for Energy
> Reading Validation
> 
> This commit introduces a frequency check mechanism aimed at ensuring the
> accuracy of energy readings.
> 
> Signed-off-by: Sk Anirban <sk.anirban at intel.com>
> ---
>  drivers/gpu/drm/i915/gt/selftest_rc6.c | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/gt/selftest_rc6.c
> b/drivers/gpu/drm/i915/gt/selftest_rc6.c
> index 1aa1446c8fb0..b3602328c832 100644
> --- a/drivers/gpu/drm/i915/gt/selftest_rc6.c
> +++ b/drivers/gpu/drm/i915/gt/selftest_rc6.c
> @@ -12,6 +12,7 @@
> 
>  #include "selftests/i915_random.h"
>  #include "selftests/librapl.h"
> +#include "intel_rps.h"
> 
>  static u64 rc6_residency(struct intel_rc6 *rc6)  { @@ -38,6 +39,8 @@ int
> live_rc6_manual(void *arg)
>  	ktime_t dt;
>  	u64 res[2];
>  	int err = 0;
> +	u32 rc0_freq, rc6_freq;
> +	struct intel_rps *rps = &gt->rps;
> 
>  	/*
>  	 * Our claim is that we can "encourage" the GPU to enter rc6 at will.
> @@ -66,6 +69,7 @@ int live_rc6_manual(void *arg)
>  	rc0_power = librapl_energy_uJ() - rc0_power;
>  	dt = ktime_sub(ktime_get(), dt);
>  	res[1] = rc6_residency(rc6);
> +	rc0_freq = intel_rps_read_actual_frequency(rps);
>  	if ((res[1] - res[0]) >> 10) {
>  		pr_err("RC6 residency increased by %lldus while disabled for
> 1000ms!\n",
>  		       (res[1] - res[0]) >> 10);
> @@ -91,6 +95,7 @@ int live_rc6_manual(void *arg)
>  	dt = ktime_get();
>  	rc6_power = librapl_energy_uJ();
>  	msleep(100);
> +	rc6_freq = intel_rps_read_actual_frequency(rps);
>  	rc6_power = librapl_energy_uJ() - rc6_power;
>  	dt = ktime_sub(ktime_get(), dt);
>  	res[1] = rc6_residency(rc6);
> @@ -109,6 +114,7 @@ int live_rc6_manual(void *arg)
>  			rc0_power, rc6_power);
>  		if (2 * rc6_power > rc0_power) {
>  			pr_err("GPU leaked energy while in RC6!\n");
> +			pr_info("GPU Freq: %u in RC6 and %u in RC0\n",
> rc6_freq, rc0_freq);
We don't need to remove the pr_err , just add frequency in pr_err log.
Thanks,
Anshuman Gupta.
>  			err = -EINVAL;
>  			goto out_unlock;
>  		}
> --
> 2.34.1