Re: [Intel-gfx] [PATCH 18/19] drm/i915/guc: Support OA when Wa_16011777198 is enabled

[Umesh Nerlige Ramappa <umesh.nerlige.ramappa@intel.com>]

On Fri, Sep 16, 2022 at 02:41:01PM -0700, Dixit, Ashutosh wrote:
>On Tue, 23 Aug 2022 13:41:54 -0700, Umesh Nerlige Ramappa wrote:
>>
>> From: Vinay Belgaumkar <vinay.belgaumkar@intel.com>
>>
>> There is a w/a to reset RCS/CCS before it goes into RC6. This breaks
>> OA. Fix it by disabling RC6.
>
>Need to mention DG2 in the commit message?
>

will do

>> Signed-off-by: Vinay Belgaumkar <vinay.belgaumkar@intel.com>
>> ---
>>  .../drm/i915/gt/uc/abi/guc_actions_slpc_abi.h |  9 ++++
>>  drivers/gpu/drm/i915/gt/uc/intel_guc_slpc.c   | 45 +++++++++++++++++++
>>  drivers/gpu/drm/i915/gt/uc/intel_guc_slpc.h   |  2 +
>>  drivers/gpu/drm/i915/i915_perf.c              | 29 ++++++++++++
>>  4 files changed, 85 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/i915/gt/uc/abi/guc_actions_slpc_abi.h b/drivers/gpu/drm/i915/gt/uc/abi/guc_actions_slpc_abi.h
>> index 4c840a2639dc..811add10c30d 100644
>> --- a/drivers/gpu/drm/i915/gt/uc/abi/guc_actions_slpc_abi.h
>> +++ b/drivers/gpu/drm/i915/gt/uc/abi/guc_actions_slpc_abi.h
>> @@ -128,6 +128,15 @@ enum slpc_media_ratio_mode {
>>	SLPC_MEDIA_RATIO_MODE_FIXED_ONE_TO_TWO = 2,
>>  };
>>
>> +enum slpc_gucrc_mode {
>> +	SLPC_GUCRC_MODE_HW = 0,
>> +	SLPC_GUCRC_MODE_GUCRC_NO_RC6 = 1,
>> +	SLPC_GUCRC_MODE_GUCRC_STATIC_TIMEOUT = 2,
>> +	SLPC_GUCRC_MODE_GUCRC_DYNAMIC_HYSTERESIS = 3,
>> +
>> +	SLPC_GUCRC_MODE_MAX,
>> +};
>> +
>>  enum slpc_event_id {
>>	SLPC_EVENT_RESET = 0,
>>	SLPC_EVENT_SHUTDOWN = 1,
>> diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_slpc.c b/drivers/gpu/drm/i915/gt/uc/intel_guc_slpc.c
>> index e1fa1f32f29e..23989f5452a7 100644
>> --- a/drivers/gpu/drm/i915/gt/uc/intel_guc_slpc.c
>> +++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_slpc.c
>> @@ -642,6 +642,51 @@ static void slpc_get_rp_values(struct intel_guc_slpc *slpc)
>>		slpc->boost_freq = slpc->rp0_freq;
>>  }
>>
>> +/**
>> + * intel_guc_slpc_override_gucrc_mode() - override GUCRC mode
>> + * @slpc: pointer to intel_guc_slpc.
>> + * @mode: new value of the mode.
>> + *
>> + * This function will override the GUCRC mode.
>> + *
>> + * Return: 0 on success, non-zero error code on failure.
>> + */
>> +int intel_guc_slpc_override_gucrc_mode(struct intel_guc_slpc *slpc, u32 mode)
>> +{
>> +	int ret;
>> +	struct drm_i915_private *i915 = slpc_to_i915(slpc);
>> +	intel_wakeref_t wakeref;
>> +
>> +	if (mode >= SLPC_GUCRC_MODE_MAX)
>> +		return -EINVAL;
>> +
>> +	wakeref = intel_runtime_pm_get(&i915->runtime_pm);
>> +
>> +	ret = slpc_set_param(slpc, SLPC_PARAM_PWRGATE_RC_MODE, mode);
>> +	if (ret)
>> +		drm_err(&i915->drm,
>> +			"Override gucrc mode %d failed %d\n",
>> +			mode, ret);
>> +
>> +	intel_runtime_pm_put(&i915->runtime_pm, wakeref);
>
>nit but I think let's switch to with_intel_runtime_pm() since all other
>slpc functions use that.
>

will do
>> +
>> +	return ret;
>> +}
>> +
>> +int intel_guc_slpc_unset_gucrc_mode(struct intel_guc_slpc *slpc)
>> +{
>> +	struct drm_i915_private *i915 = slpc_to_i915(slpc);
>> +	int ret = 0;
>> +
>> +	ret = slpc_unset_param(slpc, SLPC_PARAM_PWRGATE_RC_MODE);
>
>Looks like slpc_unset_param() is not present so that needs to be added to
>the patch too, otherwise probably doesn't even compile.
>

yes, looks like a recent patch removed it. I will add it back here.

>> +	if (ret)
>> +		drm_err(&i915->drm,
>> +			"Unsetting gucrc mode failed %d\n",
>> +			ret);
>> +
>> +	return ret;
>> +}
>> +
>>  /*
>>   * intel_guc_slpc_enable() - Start SLPC
>>   * @slpc: pointer to intel_guc_slpc.
>> diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_slpc.h b/drivers/gpu/drm/i915/gt/uc/intel_guc_slpc.h
>> index 82a98f78f96c..ccf483730d9d 100644
>> --- a/drivers/gpu/drm/i915/gt/uc/intel_guc_slpc.h
>> +++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_slpc.h
>> @@ -42,5 +42,7 @@ int intel_guc_slpc_set_media_ratio_mode(struct intel_guc_slpc *slpc, u32 val);
>>  void intel_guc_pm_intrmsk_enable(struct intel_gt *gt);
>>  void intel_guc_slpc_boost(struct intel_guc_slpc *slpc);
>>  void intel_guc_slpc_dec_waiters(struct intel_guc_slpc *slpc);
>> +int intel_guc_slpc_unset_gucrc_mode(struct intel_guc_slpc *slpc);
>> +int intel_guc_slpc_override_gucrc_mode(struct intel_guc_slpc *slpc, u32 mode);
>>
>>  #endif
>> diff --git a/drivers/gpu/drm/i915/i915_perf.c b/drivers/gpu/drm/i915/i915_perf.c
>> index 132c2ce8b33b..ce1b6ad4d107 100644
>> --- a/drivers/gpu/drm/i915/i915_perf.c
>> +++ b/drivers/gpu/drm/i915/i915_perf.c
>> @@ -208,6 +208,7 @@
>>  #include "gt/intel_lrc.h"
>>  #include "gt/intel_lrc_reg.h"
>>  #include "gt/intel_ring.h"
>> +#include "gt/uc/intel_guc_slpc.h"
>>
>>  #include "i915_drv.h"
>>  #include "i915_file_private.h"
>> @@ -1651,6 +1652,16 @@ static void i915_oa_stream_destroy(struct i915_perf_stream *stream)
>>
>>	free_oa_buffer(stream);
>>
>> +	/*
>> +	 * Wa_16011777198:dg2: Unset the override of GUCRC mode to enable rc6.
>> +	 */
>> +	if (intel_guc_slpc_is_used(&gt->uc.guc) &&
>> +	    intel_uc_uses_guc_rc(&gt->uc) &&
>> +	    (IS_DG2_GRAPHICS_STEP(gt->i915, G10, STEP_A0, STEP_C0) ||
>> +	     IS_DG2_GRAPHICS_STEP(gt->i915, G11, STEP_A0, STEP_B0)))
>
>Do these steppings need to be tweaked, otherwise ok as is too.

Probably the G11 can be dropped, but I would leave it as is.

Thanks,
Umesh