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.
Signed-off-by: Mike Leach mike.leach@linaro.org --- drivers/hwtracing/coresight/Makefile | 3 +- .../hwtracing/coresight/coresight-cfg-afdo.c | 154 ++++++++++++++++++ .../coresight/coresight-cfg-preload.c | 25 +++ .../coresight/coresight-cfg-preload.h | 11 ++ drivers/hwtracing/coresight/coresight-core.c | 6 + .../hwtracing/coresight/coresight-syscfg.h | 1 + 6 files changed, 199 insertions(+), 1 deletion(-) create mode 100644 drivers/hwtracing/coresight/coresight-cfg-afdo.c create mode 100644 drivers/hwtracing/coresight/coresight-cfg-preload.c create mode 100644 drivers/hwtracing/coresight/coresight-cfg-preload.h
diff --git a/drivers/hwtracing/coresight/Makefile b/drivers/hwtracing/coresight/Makefile index ea544206204d..2707bfef1b76 100644 --- a/drivers/hwtracing/coresight/Makefile +++ b/drivers/hwtracing/coresight/Makefile @@ -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 diff --git a/drivers/hwtracing/coresight/coresight-cfg-afdo.c b/drivers/hwtracing/coresight/coresight-cfg-afdo.c new file mode 100644 index 000000000000..ff69fb3f4434 --- /dev/null +++ b/drivers/hwtracing/coresight/coresight-cfg-afdo.c @@ -0,0 +1,154 @@ +// 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" +#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 = { + .name = "strobing", + .brief = "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 = strobe_params, + .nr_regs = ARRAY_SIZE(strobe_regs), + .regs = 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_PARAM_SUM ARRAY_SIZE(strobe_params) + +#define AFDO_MATCH_STROBING (CS_CFG_MATCH_INST_ANY | CS_CFG_MATCH_CLASS_SRC_ETM4) + +static struct cscfg_config_feat_ref afdo_refs[] = { + { + .name = "strobing", + .match = { + .match_flags = AFDO_MATCH_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_PARAM_SUM] = { + { 5000, 2 }, + { 5000, 4 }, + { 5000, 8 }, + { 5000, 16 }, + { 5000, 64 }, + { 5000, 128 }, + { 5000, 512 }, + { 5000, 1024 }, + { 5000, 4096 }, +}; + +struct cscfg_config_desc afdo = { + .name = "autofdo", + .brief = "Setup ETMs with strobing for autofdo\n" + "Supplied presets allow experimentation with mark-space ratio for various loads\n", + .nr_refs = ARRAY_SIZE(afdo_refs), + .refs = afdo_refs, + .nr_presets = AFDO_NR_PRESETS, + .nr_total_params = AFDO_NR_PARAM_SUM, + .presets = &afdo_presets[0][0], +}; diff --git a/drivers/hwtracing/coresight/coresight-cfg-preload.c b/drivers/hwtracing/coresight/coresight-cfg-preload.c new file mode 100644 index 000000000000..c7ec5cbdd990 --- /dev/null +++ b/drivers/hwtracing/coresight/coresight-cfg-preload.c @@ -0,0 +1,25 @@ +// 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" + +static struct cscfg_feature_desc *preload_feats[] = { + &strobe, + 0 +}; + +static struct cscfg_config_desc *preload_cfgs[] = { + &afdo, + 0 +}; + +/* preload called with mutex locked */ +int cscfg_preload(void) +{ + return cscfg_load_config_sets(preload_cfgs, preload_feats); +} diff --git a/drivers/hwtracing/coresight/coresight-cfg-preload.h b/drivers/hwtracing/coresight/coresight-cfg-preload.h new file mode 100644 index 000000000000..fc4ac7faa93d --- /dev/null +++ b/drivers/hwtracing/coresight/coresight-cfg-preload.h @@ -0,0 +1,11 @@ +/* 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 */ +extern struct cscfg_feature_desc strobe; +extern struct cscfg_config_desc afdo; diff --git a/drivers/hwtracing/coresight/coresight-core.c b/drivers/hwtracing/coresight/coresight-core.c index 6bd41de46648..633ddcffc6c7 100644 --- a/drivers/hwtracing/coresight/coresight-core.c +++ b/drivers/hwtracing/coresight/coresight-core.c @@ -1744,9 +1744,15 @@ static int __init coresight_init(void)
/* initialise the coresight syscfg API */ ret = cscfg_init(); + if (ret) + goto exit_perf_close; + + /* preload builtin configurations */ + ret = cscfg_preload(); if (!ret) return 0;
+exit_perf_close: etm_perf_exit(); exit_bus_unregister: bus_unregister(&coresight_bustype); diff --git a/drivers/hwtracing/coresight/coresight-syscfg.h b/drivers/hwtracing/coresight/coresight-syscfg.h index 301e26e1e98f..a8a6b21315d8 100644 --- a/drivers/hwtracing/coresight/coresight-syscfg.h +++ b/drivers/hwtracing/coresight/coresight-syscfg.h @@ -47,6 +47,7 @@ struct cscfg_csdev_register { /* internal core operations for cscfg */ int __init cscfg_init(void); void __exit cscfg_exit(void); +int cscfg_preload(void);
/* syscfg manager external API */ int cscfg_load_config_sets(struct cscfg_config_desc **cfg_descs,