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From:   Mike Leach <mike.leach@linaro.org>
To:     linux-arm-kernel@lists.infradead.org, coresight@lists.linaro.org,
        mathieu.poirier@linaro.org, linux-doc@vger.kernel.org,
        suzuki.poulose@arm.com
Cc:     yabinc@google.com, corbet@lwn.net, leo.yan@linaro.org,
        alexander.shishkin@linux.intel.com, tingwei@codeaurora.org,
        gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org,
        Mike Leach <mike.leach@linaro.org>
Subject: [PATCH v4 08/10] coresight: config: Add preloaded configurations
Date:   Thu, 28 Jan 2021 17:09:34 +0000
Message-Id: <20210128170936.9222-9-mike.leach@linaro.org>
In-Reply-To: <20210128170936.9222-1-mike.leach@linaro.org>
References: <20210128170936.9222-1-mike.leach@linaro.org>
Precedence: bulk

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,
-- 
2.17.1