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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: Mike Leach <mike.leach@linaro.org> Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org> Link: https://lore.kernel.org/r/20210818194022.379573-9-mathieu.poirier@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
154 lines
3.7 KiB
C
154 lines
3.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright(C) 2020 Linaro Limited. All rights reserved.
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* Author: Mike Leach <mike.leach@linaro.org>
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*/
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#include "coresight-config.h"
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/* ETMv4 includes and features */
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#if IS_ENABLED(CONFIG_CORESIGHT_SOURCE_ETM4X)
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#include "coresight-etm4x-cfg.h"
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/* preload configurations and features */
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/* preload in features for ETMv4 */
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/* strobe feature */
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static struct cscfg_parameter_desc strobe_params[] = {
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{
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.name = "window",
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.value = 5000,
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},
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{
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.name = "period",
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.value = 10000,
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},
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};
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static struct cscfg_regval_desc strobe_regs[] = {
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/* resource selectors */
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{
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.type = CS_CFG_REG_TYPE_RESOURCE,
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.offset = TRCRSCTLRn(2),
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.hw_info = ETM4_CFG_RES_SEL,
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.val32 = 0x20001,
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},
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{
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.type = CS_CFG_REG_TYPE_RESOURCE,
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.offset = TRCRSCTLRn(3),
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.hw_info = ETM4_CFG_RES_SEQ,
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.val32 = 0x20002,
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},
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/* strobe window counter 0 - reload from param 0 */
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{
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.type = CS_CFG_REG_TYPE_RESOURCE | CS_CFG_REG_TYPE_VAL_SAVE,
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.offset = TRCCNTVRn(0),
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.hw_info = ETM4_CFG_RES_CTR,
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},
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{
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.type = CS_CFG_REG_TYPE_RESOURCE | CS_CFG_REG_TYPE_VAL_PARAM,
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.offset = TRCCNTRLDVRn(0),
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.hw_info = ETM4_CFG_RES_CTR,
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.val32 = 0,
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},
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{
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.type = CS_CFG_REG_TYPE_RESOURCE,
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.offset = TRCCNTCTLRn(0),
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.hw_info = ETM4_CFG_RES_CTR,
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.val32 = 0x10001,
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},
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/* strobe period counter 1 - reload from param 1 */
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{
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.type = CS_CFG_REG_TYPE_RESOURCE | CS_CFG_REG_TYPE_VAL_SAVE,
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.offset = TRCCNTVRn(1),
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.hw_info = ETM4_CFG_RES_CTR,
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},
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{
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.type = CS_CFG_REG_TYPE_RESOURCE | CS_CFG_REG_TYPE_VAL_PARAM,
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.offset = TRCCNTRLDVRn(1),
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.hw_info = ETM4_CFG_RES_CTR,
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.val32 = 1,
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},
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{
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.type = CS_CFG_REG_TYPE_RESOURCE,
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.offset = TRCCNTCTLRn(1),
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.hw_info = ETM4_CFG_RES_CTR,
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.val32 = 0x8102,
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},
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/* sequencer */
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{
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.type = CS_CFG_REG_TYPE_RESOURCE,
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.offset = TRCSEQEVRn(0),
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.hw_info = ETM4_CFG_RES_SEQ,
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.val32 = 0x0081,
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},
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{
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.type = CS_CFG_REG_TYPE_RESOURCE,
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.offset = TRCSEQEVRn(1),
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.hw_info = ETM4_CFG_RES_SEQ,
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.val32 = 0x0000,
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},
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/* view-inst */
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{
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.type = CS_CFG_REG_TYPE_STD | CS_CFG_REG_TYPE_VAL_MASK,
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.offset = TRCVICTLR,
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.val32 = 0x0003,
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.mask32 = 0x0003,
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},
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/* end of regs */
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};
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struct cscfg_feature_desc strobe_etm4x = {
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.name = "strobing",
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.description = "Generate periodic trace capture windows.\n"
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"parameter \'window\': a number of CPU cycles (W)\n"
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"parameter \'period\': trace enabled for W cycles every period x W cycles\n",
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.match_flags = CS_CFG_MATCH_CLASS_SRC_ETM4,
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.nr_params = ARRAY_SIZE(strobe_params),
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.params_desc = strobe_params,
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.nr_regs = ARRAY_SIZE(strobe_regs),
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.regs_desc = strobe_regs,
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};
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/* create an autofdo configuration */
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/* we will provide 9 sets of preset parameter values */
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#define AFDO_NR_PRESETS 9
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/* the total number of parameters in used features */
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#define AFDO_NR_PARAMS ARRAY_SIZE(strobe_params)
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static const char *afdo_ref_names[] = {
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"strobing",
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};
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/*
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* set of presets leaves strobing window constant while varying period to allow
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* experimentation with mark / space ratios for various workloads
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*/
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static u64 afdo_presets[AFDO_NR_PRESETS][AFDO_NR_PARAMS] = {
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{ 5000, 2 },
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{ 5000, 4 },
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{ 5000, 8 },
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{ 5000, 16 },
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{ 5000, 64 },
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{ 5000, 128 },
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{ 5000, 512 },
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{ 5000, 1024 },
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{ 5000, 4096 },
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};
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struct cscfg_config_desc afdo_etm4x = {
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.name = "autofdo",
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.description = "Setup ETMs with strobing for autofdo\n"
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"Supplied presets allow experimentation with mark-space ratio for various loads\n",
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.nr_feat_refs = ARRAY_SIZE(afdo_ref_names),
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.feat_ref_names = afdo_ref_names,
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.nr_presets = AFDO_NR_PRESETS,
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.nr_total_params = AFDO_NR_PARAMS,
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.presets = &afdo_presets[0][0],
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};
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/* end of ETM4x configurations */
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#endif /* IS_ENABLED(CONFIG_CORESIGHT_SOURCE_ETM4X) */
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