Commit 7fdc9bb2 authored by Mike Leach's avatar Mike Leach Committed by Greg Kroah-Hartman
Browse files

coresight: config: Add preloaded configurations 

Preload set of configurations.

This patch creates a small set of preloaded configurations and features
that are available immediately after coresight has been initialised.

The current set provides a strobing feature for ETMv4, that creates a
periodic sampling of trace by switching trace generation on and off
using counters in the ETM.

A configuration called "autofdo" is also provided that uses the 'strobing'
feature and provides a couple of preset values, selectable on the perf
command line.

Link: https://lore.kernel.org/r/20210723165444.1048-9-mike.leach@linaro.org


Signed-off-by: default avatarMike Leach <mike.leach@linaro.org>
Signed-off-by: default avatarMathieu Poirier <mathieu.poirier@linaro.org>
Link: https://lore.kernel.org/r/20210818194022.379573-9-mathieu.poirier@linaro.org


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 810ac401

drivers/hwtracing/coresight/Makefile

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@@ -4,7 +4,8 @@ 
#

obj-$(CONFIG_CORESIGHT) += coresight.o

coresight-y := coresight-core.o  coresight-etm-perf.o coresight-platform.o \

		coresight-sysfs.o coresight-syscfg.o coresight-config.o

		coresight-sysfs.o coresight-syscfg.o coresight-config.o \

		coresight-cfg-preload.o coresight-cfg-afdo.o

obj-$(CONFIG_CORESIGHT_LINK_AND_SINK_TMC) += coresight-tmc.o

coresight-tmc-y := coresight-tmc-core.o coresight-tmc-etf.o \

		      coresight-tmc-etr.o

drivers/hwtracing/coresight/coresight-cfg-afdo.c

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// SPDX-License-Identifier: GPL-2.0

/*

 * Copyright(C) 2020 Linaro Limited. All rights reserved.

 * Author: Mike Leach <mike.leach@linaro.org>

 */



#include "coresight-config.h"



/* ETMv4 includes and features */

#if IS_ENABLED(CONFIG_CORESIGHT_SOURCE_ETM4X)

#include "coresight-etm4x-cfg.h"



/* preload configurations and features */



/* preload in features for ETMv4 */



/* strobe feature */

static struct cscfg_parameter_desc strobe_params[] = {

	{

		.name = "window",

		.value = 5000,

	},

	{

		.name = "period",

		.value = 10000,

	},

};



static struct cscfg_regval_desc strobe_regs[] = {

	/* resource selectors */

	{

		.type = CS_CFG_REG_TYPE_RESOURCE,

		.offset = TRCRSCTLRn(2),

		.hw_info = ETM4_CFG_RES_SEL,

		.val32 = 0x20001,

	},

	{

		.type = CS_CFG_REG_TYPE_RESOURCE,

		.offset = TRCRSCTLRn(3),

		.hw_info = ETM4_CFG_RES_SEQ,

		.val32 = 0x20002,

	},

	/* strobe window counter 0 - reload from param 0 */

	{

		.type = CS_CFG_REG_TYPE_RESOURCE | CS_CFG_REG_TYPE_VAL_SAVE,

		.offset = TRCCNTVRn(0),

		.hw_info = ETM4_CFG_RES_CTR,

	},

	{

		.type = CS_CFG_REG_TYPE_RESOURCE | CS_CFG_REG_TYPE_VAL_PARAM,

		.offset = TRCCNTRLDVRn(0),

		.hw_info = ETM4_CFG_RES_CTR,

		.val32 = 0,

	},

	{

		.type = CS_CFG_REG_TYPE_RESOURCE,

		.offset = TRCCNTCTLRn(0),

		.hw_info = ETM4_CFG_RES_CTR,

		.val32 = 0x10001,

	},

	/* strobe period counter 1 - reload from param 1 */

	{

		.type = CS_CFG_REG_TYPE_RESOURCE | CS_CFG_REG_TYPE_VAL_SAVE,

		.offset = TRCCNTVRn(1),

		.hw_info = ETM4_CFG_RES_CTR,

	},

	{

		.type = CS_CFG_REG_TYPE_RESOURCE | CS_CFG_REG_TYPE_VAL_PARAM,

		.offset = TRCCNTRLDVRn(1),

		.hw_info = ETM4_CFG_RES_CTR,

		.val32 = 1,

	},

	{

		.type = CS_CFG_REG_TYPE_RESOURCE,

		.offset = TRCCNTCTLRn(1),

		.hw_info = ETM4_CFG_RES_CTR,

		.val32 = 0x8102,

	},

	/* sequencer */

	{

		.type = CS_CFG_REG_TYPE_RESOURCE,

		.offset = TRCSEQEVRn(0),

		.hw_info = ETM4_CFG_RES_SEQ,

		.val32 = 0x0081,

	},

	{

		.type = CS_CFG_REG_TYPE_RESOURCE,

		.offset = TRCSEQEVRn(1),

		.hw_info = ETM4_CFG_RES_SEQ,

		.val32 = 0x0000,

	},

	/* view-inst */

	{

		.type = CS_CFG_REG_TYPE_STD | CS_CFG_REG_TYPE_VAL_MASK,

		.offset = TRCVICTLR,

		.val32 = 0x0003,

		.mask32 = 0x0003,

	},

	/* end of regs */

};



struct cscfg_feature_desc strobe_etm4x = {

	.name = "strobing",

	.description = "Generate periodic trace capture windows.\n"

		       "parameter \'window\': a number of CPU cycles (W)\n"

		       "parameter \'period\': trace enabled for W cycles every period x W cycles\n",

	.match_flags = CS_CFG_MATCH_CLASS_SRC_ETM4,

	.nr_params = ARRAY_SIZE(strobe_params),

	.params_desc = strobe_params,

	.nr_regs = ARRAY_SIZE(strobe_regs),

	.regs_desc = strobe_regs,

};



/* create an autofdo configuration */



/* we will provide 9 sets of preset parameter values */

#define AFDO_NR_PRESETS	9

/* the total number of parameters in used features */

#define AFDO_NR_PARAMS	ARRAY_SIZE(strobe_params)



static const char *afdo_ref_names[] = {

	"strobing",

};



/*

 * set of presets leaves strobing window constant while varying period to allow

 * experimentation with mark / space ratios for various workloads

 */

static u64 afdo_presets[AFDO_NR_PRESETS][AFDO_NR_PARAMS] = {

	{ 5000, 2 },

	{ 5000, 4 },

	{ 5000, 8 },

	{ 5000, 16 },

	{ 5000, 64 },

	{ 5000, 128 },

	{ 5000, 512 },

	{ 5000, 1024 },

	{ 5000, 4096 },

};



struct cscfg_config_desc afdo_etm4x = {

	.name = "autofdo",

	.description = "Setup ETMs with strobing for autofdo\n"

	"Supplied presets allow experimentation with mark-space ratio for various loads\n",

	.nr_feat_refs = ARRAY_SIZE(afdo_ref_names),

	.feat_ref_names = afdo_ref_names,

	.nr_presets = AFDO_NR_PRESETS,

	.nr_total_params = AFDO_NR_PARAMS,

	.presets = &afdo_presets[0][0],

};



/* end of ETM4x configurations */

#endif	/* IS_ENABLED(CONFIG_CORESIGHT_SOURCE_ETM4X) */

drivers/hwtracing/coresight/coresight-cfg-preload.c

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// SPDX-License-Identifier: GPL-2.0

/*

 * Copyright(C) 2020 Linaro Limited. All rights reserved.

 * Author: Mike Leach <mike.leach@linaro.org>

 */



#include "coresight-cfg-preload.h"

#include "coresight-config.h"

#include "coresight-syscfg.h"



/* Basic features and configurations pre-loaded on initialisation */



static struct cscfg_feature_desc *preload_feats[] = {

#if IS_ENABLED(CONFIG_CORESIGHT_SOURCE_ETM4X)

	&strobe_etm4x,

#endif

	NULL

};



static struct cscfg_config_desc *preload_cfgs[] = {

#if IS_ENABLED(CONFIG_CORESIGHT_SOURCE_ETM4X)

	&afdo_etm4x,

#endif

	NULL

};



/* preload called on initialisation */

int cscfg_preload(void)

{

	return cscfg_load_config_sets(preload_cfgs, preload_feats);

}

drivers/hwtracing/coresight/coresight-cfg-preload.h

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/* SPDX-License-Identifier: GPL-2.0 */

/*

 * Copyright(C) 2020 Linaro Limited. All rights reserved.

 * Author: Mike Leach <mike.leach@linaro.org>

 */



/* declare preloaded configurations and features */



/* from coresight-cfg-afdo.c - etm 4x features */

#if IS_ENABLED(CONFIG_CORESIGHT_SOURCE_ETM4X)

extern struct cscfg_feature_desc strobe_etm4x;

extern struct cscfg_config_desc afdo_etm4x;

#endif

drivers/hwtracing/coresight/coresight-etm4x-cfg.h

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@@ -9,6 +9,21 @@ 
#include "coresight-config.h"

#include "coresight-etm4x.h"



/* ETMv4 specific config defines */



/* resource IDs */



#define ETM4_CFG_RES_CTR	0x001

#define ETM4_CFG_RES_CMP	0x002

#define ETM4_CFG_RES_CMP_PAIR0	0x003

#define ETM4_CFG_RES_CMP_PAIR1	0x004

#define ETM4_CFG_RES_SEL	0x005

#define ETM4_CFG_RES_SEL_PAIR0	0x006

#define ETM4_CFG_RES_SEL_PAIR1	0x007

#define ETM4_CFG_RES_SEQ	0x008

#define ETM4_CFG_RES_TS		0x009

#define ETM4_CFG_RES_MASK	0x00F



/* ETMv4 specific config functions */

int etm4_cscfg_register(struct coresight_device *csdev);