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From: "Belgaumkar, Vinay" <vinay.belgaumkar@intel.com>
To: Michal Wajdeczko <michal.wajdeczko@intel.com>,
	<intel-gfx@lists.freedesktop.org>,
	<dri-devel@lists.freedesktop.org>
Subject: Re: [Intel-gfx] [PATCH 11/14] drm/i915/guc/slpc: Cache platform frequency limits
Date: Thu, 29 Jul 2021 10:24:03 -0700	[thread overview]
Message-ID: <55241f16-e17c-4d43-9af4-9db2c1be2335@intel.com> (raw)
In-Reply-To: <cd7cc618-05b9-8f1f-7a0a-7417f09f9b12@intel.com>



On 7/29/2021 9:21 AM, Michal Wajdeczko wrote:
> 
> 
> On 28.07.2021 23:11, Vinay Belgaumkar wrote:
>> Cache rp0, rp1 and rpn platform limits into SLPC structure
>> for range checking while setting min/max frequencies.
>>
>> Also add "soft" limits which keep track of frequency changes
>> made from userland. These are initially set to platform min
>> and max.
>>
>> v2: Address review comments (Michal W)
>> v3: Formatting (Michal W)
>> v4: Add separate function to parse rp values (Michal W)
>> v5: Perform range checking for set min/max (Michal W)
>>
>> Signed-off-by: Vinay Belgaumkar <vinay.belgaumkar@intel.com>
>> ---
>>   drivers/gpu/drm/i915/gt/uc/intel_guc_slpc.c   | 115 ++++++++++++++++++
>>   .../gpu/drm/i915/gt/uc/intel_guc_slpc_types.h |   9 ++
>>   drivers/gpu/drm/i915/i915_reg.h               |   3 +
>>   3 files changed, 127 insertions(+)
>>
>> 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 742918875593..bfd5fb0751fd 100644
>> --- a/drivers/gpu/drm/i915/gt/uc/intel_guc_slpc.c
>> +++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_slpc.c
>> @@ -94,6 +94,9 @@ static int slpc_shared_data_init(struct intel_guc_slpc *slpc)
>>   		return err;
>>   	}
>>   
>> +	slpc->max_freq_softlimit = 0;
>> +	slpc->min_freq_softlimit = 0;
> 
> shouldn't this be in intel_guc_slpc_init() ?

No, we want to maintain softlimits across suspend resume.

> 
>> +
>>   	return err;
>>   }
>>   
>> @@ -124,6 +127,18 @@ static int guc_action_slpc_set_param(struct intel_guc *guc, u8 id, u32 value)
>>   	return ret > 0 ? -EPROTO : ret;
>>   }
>>   
>> +static int guc_action_slpc_unset_param(struct intel_guc *guc, u8 id)
>> +{
>> +	u32 request[] = {
>> +		GUC_ACTION_HOST2GUC_PC_SLPC_REQUEST,
>> +		SLPC_EVENT(SLPC_EVENT_PARAMETER_UNSET, 2),
>> +		id,
>> +	};
>> +
>> +	return intel_guc_send(guc, request, ARRAY_SIZE(request));
>> +}
>> +
>> +
>>   static bool slpc_is_running(struct intel_guc_slpc *slpc)
>>   {
>>   	return slpc_get_state(slpc) == SLPC_GLOBAL_STATE_RUNNING;
>> @@ -177,6 +192,16 @@ static int slpc_set_param(struct intel_guc_slpc *slpc, u8 id, u32 value)
>>   	return ret;
>>   }
>>   
>> +static int slpc_unset_param(struct intel_guc_slpc *slpc,
>> +				u8 id)
>> +{
>> +	struct intel_guc *guc = slpc_to_guc(slpc);
>> +
>> +	GEM_BUG_ON(id >= SLPC_MAX_PARAM);
>> +
>> +	return guc_action_slpc_unset_param(guc, id);
>> +}
>> +
>>   static const char *slpc_global_state_to_string(enum slpc_global_state state)
>>   {
>>   	switch (state) {
>> @@ -307,6 +332,11 @@ int intel_guc_slpc_set_max_freq(struct intel_guc_slpc *slpc, u32 val)
>>   	intel_wakeref_t wakeref;
>>   	int ret;
>>   
>> +	if ((val < slpc->min_freq) ||
>> +	    (val > slpc->rp0_freq) ||
>> +	    (val < slpc->min_freq_softlimit))
>> +		return -EINVAL;
>> +
>>   	with_intel_runtime_pm(&i915->runtime_pm, wakeref) {
>>   		ret = slpc_set_param(slpc,
>>   			       SLPC_PARAM_GLOBAL_MAX_GT_UNSLICE_FREQ_MHZ,
>> @@ -317,6 +347,8 @@ int intel_guc_slpc_set_max_freq(struct intel_guc_slpc *slpc, u32 val)
>>   			ret = -EIO;
>>   	}
>>   
>> +	slpc->max_freq_softlimit = val;
>> +
>>   	return ret;
>>   }
>>   
>> @@ -363,6 +395,11 @@ int intel_guc_slpc_set_min_freq(struct intel_guc_slpc *slpc, u32 val)
>>   	intel_wakeref_t wakeref;
>>   	int ret;
>>   
>> +	if ((val < slpc->min_freq) ||
>> +	    (val > slpc->rp0_freq) ||
>> +	    (val > slpc->max_freq_softlimit))
>> +		return -EINVAL;
>> +
>>   	with_intel_runtime_pm(&i915->runtime_pm, wakeref) {
>>   		ret = slpc_set_param(slpc,
>>   			       SLPC_PARAM_GLOBAL_MIN_GT_UNSLICE_FREQ_MHZ,
>> @@ -373,6 +410,8 @@ int intel_guc_slpc_set_min_freq(struct intel_guc_slpc *slpc, u32 val)
>>   			ret = -EIO;
>>   	}
>>   
>> +	slpc->min_freq_softlimit = val;
>> +
>>   	return ret;
>>   }
>>   
>> @@ -418,6 +457,71 @@ void intel_guc_pm_intrmsk_enable(struct intel_gt *gt)
>>   			   GEN6_PMINTRMSK, pm_intrmsk_mbz, 0);
>>   }
>>   
>> +static int slpc_set_softlimits(struct intel_guc_slpc *slpc)
>> +{
>> +	int ret = 0;
>> +
>> +	/*
>> +	 * Softlimits are initially equivalent to platform limits
>> +	 * unless they have deviated from defaults, in which case,
>> +	 * we retain the values and set min/max accordingly.
>> +	 */
>> +	if (!slpc->max_freq_softlimit)
>> +		slpc->max_freq_softlimit = slpc->rp0_freq;
>> +	else if (slpc->max_freq_softlimit != slpc->rp0_freq)
>> +		ret = intel_guc_slpc_set_max_freq(slpc,
>> +					slpc->max_freq_softlimit);
> 
> if this fails, shouldn't we reset max_freq_softlimit to platform limit ?
> otherwise we could be with some potentially bad value forever

Well, if this call fails, it's likely the next set_max_freq call will 
also fail, so not much point. Also, it will likely (?) just retain the 
old value, which is fine.

> 
>> +
>> +	if (!slpc->min_freq_softlimit)
>> +		slpc->min_freq_softlimit = slpc->min_freq;
>> +	else if (slpc->min_freq_softlimit != slpc->min_freq)
>> +		ret = intel_guc_slpc_set_min_freq(slpc,
>> +					slpc->min_freq_softlimit);
> 
> similar here
> 
>> +
>> +	return ret;
>> +}
>> +
>> +static void intel_guc_slpc_ignore_eff_freq(struct intel_guc_slpc *slpc, bool ignore)
> 
> static functions don't need "intel_guc" prefix
> 
> slpc_ignore_eff_freq
> 
>> +{
>> +	/* A failure here does not affect the algorithm in a fatal way */
>> +	if (ignore) {
>> +		slpc_set_param(slpc,
>> +		   SLPC_PARAM_IGNORE_EFFICIENT_FREQUENCY,
>> +		   ignore);
>> +		slpc_set_param(slpc,
>> +		   SLPC_PARAM_GLOBAL_MIN_GT_UNSLICE_FREQ_MHZ,
>> +		   slpc->min_freq);
>> +	} else {
>> +		slpc_unset_param(slpc,
>> +		   SLPC_PARAM_IGNORE_EFFICIENT_FREQUENCY);
>> +		slpc_unset_param(slpc,
>> +		   SLPC_PARAM_GLOBAL_MIN_GT_UNSLICE_FREQ_MHZ);
> 
> indents are likely wrong

already fixing this and the ones below as part of the checkpatch 
warnings I received on this patch set.

Thanks,
Vinay.

> 
>> +	}
>> +}
>> +
>> +static void intel_guc_slpc_use_fused_rp0(struct intel_guc_slpc *slpc)
> 
> slpc_use_fused_rp0
> 
>> +{
>> +	/* Force SLPC to used platform rp0 */
>> +	slpc_set_param(slpc,
>> +			SLPC_PARAM_GLOBAL_MAX_GT_UNSLICE_FREQ_MHZ,
>> +			slpc->rp0_freq);
>> +}
>> +
>> +static void slpc_get_rp_values(struct intel_guc_slpc *slpc)
>> +{
>> +	u32 rp_state_cap;
>> +
>> +	rp_state_cap = intel_uncore_read(slpc_to_gt(slpc)->uncore,
>> +					 GEN6_RP_STATE_CAP);
>> +
>> +	slpc->rp0_freq = REG_FIELD_GET(RP0_CAP_MASK, rp_state_cap) *
>> +					GT_FREQUENCY_MULTIPLIER;
>> +	slpc->rp1_freq = REG_FIELD_GET(RP1_CAP_MASK, rp_state_cap) *
>> +					GT_FREQUENCY_MULTIPLIER;
>> +	slpc->min_freq = REG_FIELD_GET(RPN_CAP_MASK, rp_state_cap) *
>> +					GT_FREQUENCY_MULTIPLIER;
>> +}
>> +
>>   /*
>>    * intel_guc_slpc_enable() - Start SLPC
>>    * @slpc: pointer to intel_guc_slpc.
>> @@ -453,6 +557,17 @@ int intel_guc_slpc_enable(struct intel_guc_slpc *slpc)
>>   
>>   	intel_guc_pm_intrmsk_enable(&i915->gt);
>>   
>> +	slpc_get_rp_values(slpc);
>> +
>> +	/* Ignore efficient freq and set min/max to platform min/max */
>> +	intel_guc_slpc_ignore_eff_freq(slpc, true);
>> +	intel_guc_slpc_use_fused_rp0(slpc);
>> +
>> +	ret = slpc_set_softlimits(slpc);
>> +	if (ret)
>> +		drm_err(&i915->drm, "Failed to set SLPC softlimits (%pe)\n",
>> +					ERR_PTR(ret));
> 
> indent ?
> 
>> +
>>   	return 0;
>>   }
>>   
>> diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_slpc_types.h b/drivers/gpu/drm/i915/gt/uc/intel_guc_slpc_types.h
>> index 3cefe19b17b2..41d13527666f 100644
>> --- a/drivers/gpu/drm/i915/gt/uc/intel_guc_slpc_types.h
>> +++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_slpc_types.h
>> @@ -15,6 +15,15 @@ struct intel_guc_slpc {
>>   	struct slpc_shared_data *vaddr;
>>   	bool supported;
>>   	bool selected;
>> +
>> +	/* platform frequency limits */
>> +	u32 min_freq;
>> +	u32 rp0_freq;
>> +	u32 rp1_freq;
>> +
>> +	/* frequency softlimits */
>> +	u32 min_freq_softlimit;
>> +	u32 max_freq_softlimit;
>>   };
>>   
>>   #endif
>> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
>> index 5603377e06ca..f3a445f79a36 100644
>> --- a/drivers/gpu/drm/i915/i915_reg.h
>> +++ b/drivers/gpu/drm/i915/i915_reg.h
>> @@ -4109,6 +4109,9 @@ static inline bool i915_mmio_reg_valid(i915_reg_t reg)
>>   #define BXT_GT_PERF_STATUS      _MMIO(MCHBAR_MIRROR_BASE_SNB + 0x7070)
>>   #define GEN6_RP_STATE_LIMITS	_MMIO(MCHBAR_MIRROR_BASE_SNB + 0x5994)
>>   #define GEN6_RP_STATE_CAP	_MMIO(MCHBAR_MIRROR_BASE_SNB + 0x5998)
>> +#define   RP0_CAP_MASK		REG_GENMASK(7, 0)
>> +#define   RP1_CAP_MASK		REG_GENMASK(15, 8)
>> +#define   RPN_CAP_MASK		REG_GENMASK(23, 16)
>>   #define BXT_RP_STATE_CAP        _MMIO(0x138170)
>>   #define GEN9_RP_STATE_LIMITS	_MMIO(0x138148)
>>   
>>
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  reply	other threads:[~2021-07-29 17:24 UTC|newest]

Thread overview: 35+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-28 21:11 [Intel-gfx] [PATCH v4 00/14] drm/i915/guc/slpc: Enable GuC based power management features Vinay Belgaumkar
2021-07-28 21:11 ` [Intel-gfx] [PATCH 01/14] drm/i915/guc/slpc: Initial definitions for SLPC Vinay Belgaumkar
2021-07-29 15:28   ` Michal Wajdeczko
2021-07-28 21:11 ` [Intel-gfx] [PATCH 02/14] drm/i915/guc/slpc: Gate Host RPS when SLPC is enabled Vinay Belgaumkar
2021-07-28 21:11 ` [Intel-gfx] [PATCH 03/14] drm/i915/guc/slpc: Adding SLPC communication interfaces Vinay Belgaumkar
2021-07-29 15:33   ` Michal Wajdeczko
2021-07-28 21:11 ` [Intel-gfx] [PATCH 04/14] drm/i915/guc/slpc: Allocate, initialize and release SLPC Vinay Belgaumkar
2021-07-28 21:11 ` [Intel-gfx] [PATCH 05/14] drm/i915/guc/slpc: Enable SLPC and add related H2G events Vinay Belgaumkar
2021-07-29 15:48   ` Michal Wajdeczko
2021-07-28 21:11 ` [Intel-gfx] [PATCH 06/14] drm/i915/guc/slpc: Remove BUG_ON in guc_submission_disable Vinay Belgaumkar
2021-07-28 21:11 ` [Intel-gfx] [PATCH 07/14] drm/i915/guc/slpc: Add methods to set min/max frequency Vinay Belgaumkar
2021-07-29 16:33   ` Michal Wajdeczko
2021-07-28 21:11 ` [Intel-gfx] [PATCH 08/14] drm/i915/guc/slpc: Add get max/min freq hooks Vinay Belgaumkar
2021-07-28 21:11 ` [Intel-gfx] [PATCH 09/14] drm/i915/guc/slpc: Add debugfs for SLPC info Vinay Belgaumkar
2021-07-28 21:11 ` [Intel-gfx] [PATCH 10/14] drm/i915/guc/slpc: Enable ARAT timer interrupt Vinay Belgaumkar
2021-07-28 21:11 ` [Intel-gfx] [PATCH 11/14] drm/i915/guc/slpc: Cache platform frequency limits Vinay Belgaumkar
2021-07-29 16:21   ` Michal Wajdeczko
2021-07-29 17:24     ` Belgaumkar, Vinay [this message]
2021-07-28 21:11 ` [Intel-gfx] [PATCH 12/14] drm/i915/guc/slpc: Sysfs hooks for SLPC Vinay Belgaumkar
2021-07-29 20:28   ` Michal Wajdeczko
2021-07-28 21:11 ` [Intel-gfx] [PATCH 13/14] drm/i915/guc/slpc: Add SLPC selftest Vinay Belgaumkar
2021-07-29 23:40   ` Matthew Brost
2021-07-30  1:12     ` Belgaumkar, Vinay
2021-07-30  1:45   ` kernel test robot
2021-07-28 21:11 ` [Intel-gfx] [PATCH 14/14] drm/i915/guc/rc: Setup and enable GuCRC feature Vinay Belgaumkar
2021-07-28 22:52 ` [Intel-gfx] ✗ Fi.CI.CHECKPATCH: warning for drm/i915/guc/slpc: Enable GuC based power management features (rev2) Patchwork
2021-07-28 22:54 ` [Intel-gfx] ✗ Fi.CI.SPARSE: " Patchwork
2021-07-28 23:21 ` [Intel-gfx] ✓ Fi.CI.BAT: success " Patchwork
2021-07-29  4:23 ` [Intel-gfx] ✓ Fi.CI.IGT: " Patchwork
  -- strict thread matches above, loose matches on Subject: below --
2021-07-30 20:21 [Intel-gfx] [PATCH v6 00/14] drm/i915/guc/slpc: Enable GuC based power management features Vinay Belgaumkar
2021-07-30 20:21 ` [Intel-gfx] [PATCH 11/14] drm/i915/guc/slpc: Cache platform frequency limits Vinay Belgaumkar
2021-07-31 10:40   ` Michal Wajdeczko
2021-07-30  2:00 [Intel-gfx] [PATCH v5 00/14] drm/i915/guc/slpc: Enable GuC based power management features Vinay Belgaumkar
2021-07-30  2:01 ` [Intel-gfx] [PATCH 11/14] drm/i915/guc/slpc: Cache platform frequency limits Vinay Belgaumkar
2021-07-21 16:11 [Intel-gfx] [PATCH v2 00/14] drm/i915/guc: Enable GuC based power management features Vinay Belgaumkar
2021-07-21 16:11 ` [Intel-gfx] [PATCH 11/14] drm/i915/guc/slpc: Cache platform frequency limits Vinay Belgaumkar
2021-07-21 18:09   ` Michal Wajdeczko
2021-07-23 22:25     ` Belgaumkar, Vinay

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