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Message-ID: <e8609532-547f-b728-453c-c6e930c049f7@arm.com>
Date: Fri, 5 Mar 2021 13:39:17 +0000
From: Suzuki K Poulose <suzuki.poulose@....com>
To: Mike Leach <mike.leach@...aro.org>,
linux-arm-kernel@...ts.infradead.org, coresight@...ts.linaro.org,
mathieu.poirier@...aro.org, linux-doc@...r.kernel.org
Cc: yabinc@...gle.com, corbet@....net, leo.yan@...aro.org,
alexander.shishkin@...ux.intel.com, tingwei@...eaurora.org,
gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 08/10] coresight: config: Add preloaded configurations
On 1/28/21 5:09 PM, Mike Leach wrote:
> 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@...aro.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@...aro.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",
nit: Could we align the string as below:
.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)
nit: alignment consistency. i.e 1 TAB vs 2 TABs (with AFDO_NR_PRESETS)
minor nit : s/AFDO_NR_PARAM_SUM/AFDO_NR_TOTAL_PARAMS ? or even AFDO_NR_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",
Same alignment comments as above
> + .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@...aro.org>
One line on the brief of the files purpose is helpful.
> + */
> +
> +#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@...aro.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;
Could this be folded into cscfg_init() ?
Otherwise looks fine to me
Suzuki
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