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Date:   Tue,  4 Apr 2017 06:56:31 -0400
From:   Anurup M <anurupvasu@...il.com>
To:     mark.rutland@....com, will.deacon@....com
Cc:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        anurup.m@...wei.com, zhangshaokun@...ilicon.com,
        tanxiaojun@...wei.com, xuwei5@...ilicon.com,
        sanil.kumar@...ilicon.com, john.garry@...wei.com,
        gabriele.paoloni@...wei.com, shiju.jose@...wei.com,
        huangdaode@...ilicon.com, linuxarm@...wei.com,
        dikshit.n@...wei.com, shyju.pv@...wei.com, anurupvasu@...il.com
Subject: [PATCH v7 8/9] drivers: perf: hisi: Miscellanous node(MN) event counting in perf

From: Shaokun Zhang <zhangshaokun@...ilicon.com>

1. Add support to count MN hardware events.
2. Mn events are listed in sysfs at /sys/devices/hisi_mn_2/events/
   The events can be selected as shown in perf list
   e.g.: For MN_READ_REQUEST event for Super CPU cluster 2 the
   event format is -e "hisi_mn_2/read_req/"
3. MN PMU doesnot support counter overflow IRQ in HiP05/06/07, So
   use hrtimer to poll and avoid counter overflow.

Signed-off-by: Shaokun Zhang <zhangshaokun@...ilicon.com>
Signed-off-by: Dikshit N <dikshit.n@...wei.com>
Signed-off-by: Anurup M <anurup.m@...wei.com>
---
 drivers/perf/hisilicon/Makefile         |   2 +-
 drivers/perf/hisilicon/hisi_uncore_mn.c | 478 ++++++++++++++++++++++++++++++++
 2 files changed, 479 insertions(+), 1 deletion(-)
 create mode 100644 drivers/perf/hisilicon/hisi_uncore_mn.c

diff --git a/drivers/perf/hisilicon/Makefile b/drivers/perf/hisilicon/Makefile
index 0887b56..26b2507 100644
--- a/drivers/perf/hisilicon/Makefile
+++ b/drivers/perf/hisilicon/Makefile
@@ -1 +1 @@
-obj-$(CONFIG_HISI_PMU) += djtag.o hisi_uncore_pmu.o hisi_uncore_l3c.o
+obj-$(CONFIG_HISI_PMU) += djtag.o hisi_uncore_pmu.o hisi_uncore_l3c.o hisi_uncore_mn.o
diff --git a/drivers/perf/hisilicon/hisi_uncore_mn.c b/drivers/perf/hisilicon/hisi_uncore_mn.c
new file mode 100644
index 0000000..63a4060
--- /dev/null
+++ b/drivers/perf/hisilicon/hisi_uncore_mn.c
@@ -0,0 +1,478 @@
+/*
+ * HiSilicon SoC MN Hardware event counters support
+ *
+ * Copyright (C) 2017 Hisilicon Limited
+ * Author: Shaokun Zhang <zhangshaokun@...ilicon.com>
+ *
+ * This code is based on the uncore PMUs like arm-cci and
+ * arm-ccn.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#include <linux/bitmap.h>
+#include <linux/errno.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/perf_event.h>
+#include <linux/property.h>
+#include "hisi_uncore_pmu.h"
+
+/*
+ * ARMv8 HiSilicon MN event types.
+ */
+enum armv8_hisi_mn_event_types {
+	HISI_HWEVENT_MN_EO_BARR_REQ	= 0x0,
+	HISI_HWEVENT_MN_EC_BARR_REQ	= 0x01,
+	HISI_HWEVENT_MN_DVM_OP_REQ	= 0x02,
+	HISI_HWEVENT_MN_DVM_SYNC_REQ	= 0x03,
+	HISI_HWEVENT_MN_READ_REQ	= 0x04,
+	HISI_HWEVENT_MN_WRITE_REQ	= 0x05,
+	HISI_HWEVENT_MN_EVENT_MAX	= 0x08,
+};
+
+/*
+ * ARMv8 HiSilicon Hardware counter Index.
+ */
+enum armv8_hisi_mn_counters {
+	HISI_IDX_MN_COUNTER0	= 0x0,
+	HISI_IDX_MN_COUNTER_MAX	= 0x4,
+};
+
+#define MN1_EVTYPE_REG_OFF 0x48
+#define MN1_EVCTRL_REG_OFF 0x40
+#define MN1_CNT0_REG_OFF 0x30
+#define MN1_EVENT_EN 0x01
+#define MN1_BANK_SELECT 0x01
+
+#define GET_MODULE_ID(hwmod_data) hwmod_data->module_id
+
+/*
+ * Default timer frequency to poll and avoid counter overflow.
+ * CPU speed = 2.4Ghz and number of CPU cores in a SCCL is 16.
+ * For a single MN event on a CPU core consumes 200 cycles.
+ * So overflow time = (2^31 * 200) / (16 * 2.4G) which is about 21 seconds
+ * So on a safe side we use a timer interval of 8sec
+ */
+#define MN1_HRTIMER_INTERVAL (8LL * MSEC_PER_SEC)
+
+struct hisi_mn_data {
+	struct hisi_djtag_client *client;
+	u32 module_id;
+};
+
+static inline int hisi_mn_counter_valid(int idx)
+{
+	return (idx >= HISI_IDX_MN_COUNTER0 &&
+			idx < HISI_IDX_MN_COUNTER_MAX);
+}
+
+/* Select the counter register offset from the index */
+static inline u32 get_counter_reg_off(int cntr_idx)
+{
+	return (MN1_CNT0_REG_OFF + (cntr_idx * 4));
+}
+
+static u32 hisi_mn_read_counter(struct hisi_mn_data *mn_data, int cntr_idx)
+{
+	struct hisi_djtag_client *client = mn_data->client;
+	u32 module_id = GET_MODULE_ID(mn_data);
+	u32 reg_off, value;
+
+	reg_off = get_counter_reg_off(cntr_idx);
+	hisi_djtag_readreg(module_id, MN1_BANK_SELECT, reg_off,
+			   client, &value);
+
+	return value;
+}
+
+static u64 hisi_mn_event_update(struct perf_event *event,
+				struct hw_perf_event *hwc, int idx)
+{
+	struct hisi_pmu *mn_pmu = to_hisi_pmu(event->pmu);
+	struct hisi_mn_data *mn_data = mn_pmu->hwmod_data;
+	u64 delta, prev_raw_count, new_raw_count = 0;
+
+	if (!hisi_mn_counter_valid(idx)) {
+		dev_err(mn_pmu->dev,
+				"Unsupported event index:%d!\n", idx);
+		return 0;
+	}
+
+	do {
+		/* Get count from the MN */
+		prev_raw_count = local64_read(&hwc->prev_count);
+		new_raw_count =	hisi_mn_read_counter(mn_data, idx);
+	} while (local64_cmpxchg(&hwc->prev_count, prev_raw_count,
+				 new_raw_count) != prev_raw_count);
+
+	/*
+	 *  compute the delta and add to event->count
+	 */
+	delta = (new_raw_count - prev_raw_count) & HISI_MAX_PERIOD;
+	local64_add(delta, &event->count);
+
+	return new_raw_count;
+}
+
+static void hisi_mn_set_evtype(struct hisi_pmu *mn_pmu, int idx, u32 val)
+{
+	struct hisi_mn_data *mn_data = mn_pmu->hwmod_data;
+	struct hisi_djtag_client *client = mn_data->client;
+	u32 module_id = GET_MODULE_ID(mn_data);
+	u32 event_value, value = 0;
+
+	event_value = (val - HISI_HWEVENT_MN_EO_BARR_REQ);
+
+	/*
+	 * Write the event code in event select register.
+	 * Each byte in the 32 bit event select register is used
+	 * to configure the event code. Each byte correspond to a
+	 * counter register to use.
+	 */
+	val = event_value << (8 * idx);
+
+	hisi_djtag_readreg(module_id, MN1_BANK_SELECT, MN1_EVTYPE_REG_OFF,
+			   client, &value);
+	value &= ~(0xff << (8 * idx));
+	value |= val;
+	hisi_djtag_writereg(module_id, MN1_BANK_SELECT, MN1_EVTYPE_REG_OFF,
+			    value, client);
+}
+
+static void hisi_mn_clear_evtype(struct hisi_pmu *mn_pmu, int idx)
+{
+	struct hisi_mn_data *mn_data = mn_pmu->hwmod_data;
+	struct hisi_djtag_client *client = mn_data->client;
+	u32 module_id = GET_MODULE_ID(mn_data);
+	u32 value;
+
+	if (!hisi_mn_counter_valid(idx)) {
+		dev_err(mn_pmu->dev,
+			"Unsupported event index:%d!\n", idx);
+		return;
+	}
+
+	/*
+	 * Clear the event code in event select register by writing value 0xff.
+	 * Each byte in the 32 bit event select register is used to configure
+	 * the event code. Each byte correspond to a counter register to use.
+	 */
+	hisi_djtag_readreg(module_id, MN1_BANK_SELECT, MN1_EVTYPE_REG_OFF,
+			   client, &value);
+	value &= ~(0xff << (8 * idx));
+	value |= (0xff << (8 * idx));
+	hisi_djtag_writereg(module_id, MN1_BANK_SELECT, MN1_EVTYPE_REG_OFF,
+			    value, client);
+}
+
+static void hisi_mn_write_counter(struct hisi_pmu *mn_pmu,
+				  struct hw_perf_event *hwc, u32 value)
+{
+	struct hisi_mn_data *mn_data = mn_pmu->hwmod_data;
+	struct hisi_djtag_client *client = mn_data->client;
+	u32 module_id = GET_MODULE_ID(mn_data);
+	u32 reg_off;
+	int idx = GET_CNTR_IDX(hwc);
+
+	reg_off = get_counter_reg_off(idx);
+	hisi_djtag_writereg(module_id, MN1_BANK_SELECT, reg_off, value, client);
+}
+
+static void hisi_mn_start_counters(struct hisi_pmu *mn_pmu)
+{
+	struct hisi_mn_data *mn_data = mn_pmu->hwmod_data;
+	struct hisi_djtag_client *client = mn_data->client;
+	unsigned long *used_mask = mn_pmu->pmu_events.used_mask;
+	u32 module_id = GET_MODULE_ID(mn_data);
+	u32 num_counters = mn_pmu->num_counters;
+	u32 value;
+	int enabled = bitmap_weight(used_mask, num_counters);
+
+	if (!enabled)
+		return;
+
+	/* Set the event_bus_en bit in MN_EVENT_CTRL to start counting */
+	hisi_djtag_readreg(module_id, MN1_BANK_SELECT, MN1_EVCTRL_REG_OFF,
+			   client, &value);
+	value |= MN1_EVENT_EN;
+	hisi_djtag_writereg(module_id, MN1_BANK_SELECT, MN1_EVCTRL_REG_OFF,
+			    value, client);
+}
+
+static void hisi_mn_stop_counters(struct hisi_pmu *mn_pmu)
+{
+	struct hisi_mn_data *mn_data = mn_pmu->hwmod_data;
+	struct hisi_djtag_client *client = mn_data->client;
+	u32 module_id = GET_MODULE_ID(mn_data);
+	u32 value;
+
+	/*
+	 * Clear the event_bus_en bit in MN_EVENT_CTRL
+	 */
+	hisi_djtag_readreg(module_id, MN1_BANK_SELECT, MN1_EVCTRL_REG_OFF,
+			   client, &value);
+	value &= ~(MN1_EVENT_EN);
+	hisi_djtag_writereg(module_id, MN1_BANK_SELECT, MN1_EVCTRL_REG_OFF,
+			    value, client);
+}
+
+static void hisi_mn_clear_event_idx(struct hisi_pmu *mn_pmu, int idx)
+{
+	if (!hisi_mn_counter_valid(idx)) {
+		dev_err(mn_pmu->dev, "Unsupported event index:%d!\n", idx);
+		return;
+	}
+	clear_bit(idx, mn_pmu->pmu_events.used_mask);
+}
+
+static int hisi_mn_get_event_idx(struct hisi_pmu *mn_pmu)
+{
+	const unsigned long *used_mask = mn_pmu->pmu_events.used_mask;
+	u32 num_counters = mn_pmu->num_counters;
+	int event_idx;
+
+	event_idx = find_first_zero_bit(used_mask, num_counters);
+	if (event_idx == num_counters)
+		return -EAGAIN;
+
+	set_bit(event_idx, mn_pmu->pmu_events.used_mask);
+
+	return event_idx;
+}
+
+static const struct of_device_id mn_of_match[] = {
+	{ .compatible = "hisilicon,hip05-pmu-mn-v1", },
+	{ .compatible = "hisilicon,hip06-pmu-mn-v1", },
+	{ .compatible = "hisilicon,hip07-pmu-mn-v2", },
+	{},
+};
+MODULE_DEVICE_TABLE(of, mn_of_match);
+
+/* Use hrtimer when no IRQ, to poll for avoiding counter overflow */
+static void hisi_mn_hrtimer_init(struct hisi_pmu *mn_pmu)
+{
+	INIT_LIST_HEAD(&mn_pmu->active_list);
+	mn_pmu->ops->start_hrtimer = hisi_hrtimer_start;
+	mn_pmu->ops->stop_hrtimer = hisi_hrtimer_stop;
+	hisi_hrtimer_init(mn_pmu, MN1_HRTIMER_INTERVAL);
+}
+
+static int hisi_mn_init_data(struct hisi_pmu *mn_pmu,
+			     struct hisi_djtag_client *client)
+{
+	struct hisi_mn_data *mn_data;
+	struct device *dev = &client->dev;
+	const struct of_device_id *of_id;
+	int ret;
+
+	mn_data = devm_kzalloc(dev, sizeof(*mn_data), GFP_KERNEL);
+	if (!mn_data)
+		return -ENOMEM;
+
+	/* Set the djtag Identifier */
+	mn_data->client = client;
+	mn_pmu->hwmod_data = mn_data;
+
+	of_id = of_match_device(mn_of_match, dev);
+	if (!of_id) {
+		dev_err(dev, "DT: Match device fail!\n");
+		return -EINVAL;
+	}
+
+	ret = device_property_read_u32(dev, "hisilicon,module-id",
+				       &mn_data->module_id);
+	if (ret < 0) {
+		dev_err(dev, "DT: Could not read module-id!\n");
+		return -EINVAL;
+	}
+
+	/*
+	 * Use poll method to avoid counter overflow when
+	 * overflow IRQ is not supported in hardware.
+	 */
+	hisi_mn_hrtimer_init(mn_pmu);
+
+	return 0;
+}
+
+static struct attribute *hisi_mn_format_attr[] = {
+	HISI_PMU_FORMAT_ATTR(event, "config:0-7"),
+	NULL,
+};
+
+static const struct attribute_group hisi_mn_format_group = {
+	.name = "format",
+	.attrs = hisi_mn_format_attr,
+};
+
+static struct attribute *hisi_mn_events_attr[] = {
+	HISI_PMU_EVENT_ATTR_STR(eo_barrier_req, "event=0x0"),
+	HISI_PMU_EVENT_ATTR_STR(ec_barrier_req,	"event=0x01"),
+	HISI_PMU_EVENT_ATTR_STR(dvm_op_req, "event=0x02"),
+	HISI_PMU_EVENT_ATTR_STR(dvm_sync_req, "event=0x03"),
+	HISI_PMU_EVENT_ATTR_STR(read_req, "event=0x04"),
+	HISI_PMU_EVENT_ATTR_STR(write_req, "event=0x05"),
+	NULL,
+};
+
+static const struct attribute_group hisi_mn_events_group = {
+	.name = "events",
+	.attrs = hisi_mn_events_attr,
+};
+
+static struct attribute *hisi_mn_attrs[] = {
+	NULL,
+};
+
+static const struct attribute_group hisi_mn_attr_group = {
+	.attrs = hisi_mn_attrs,
+};
+
+static DEVICE_ATTR(cpumask, 0444, hisi_cpumask_sysfs_show, NULL);
+
+static struct attribute *hisi_mn_cpumask_attrs[] = {
+	&dev_attr_cpumask.attr,
+	NULL,
+};
+
+static const struct attribute_group hisi_mn_cpumask_attr_group = {
+	.attrs = hisi_mn_cpumask_attrs,
+};
+
+static const struct attribute_group *hisi_mn_pmu_attr_groups[] = {
+	&hisi_mn_attr_group,
+	&hisi_mn_format_group,
+	&hisi_mn_events_group,
+	&hisi_mn_cpumask_attr_group,
+	NULL,
+};
+
+static struct hisi_uncore_ops hisi_uncore_mn_ops = {
+	.set_evtype = hisi_mn_set_evtype,
+	.clear_evtype = hisi_mn_clear_evtype,
+	.set_event_period = hisi_pmu_set_event_period,
+	.get_event_idx = hisi_mn_get_event_idx,
+	.clear_event_idx = hisi_mn_clear_event_idx,
+	.event_update = hisi_mn_event_update,
+	.start_counters = hisi_mn_start_counters,
+	.stop_counters = hisi_mn_stop_counters,
+	.write_counter = hisi_mn_write_counter,
+};
+
+static void hisi_mn_pmu_init(struct hisi_pmu *mn_pmu,
+			     struct hisi_djtag_client *client)
+{
+	struct device *dev = &client->dev;
+
+	mn_pmu->num_events = HISI_HWEVENT_MN_EVENT_MAX;
+	mn_pmu->num_counters = HISI_IDX_MN_COUNTER_MAX;
+	mn_pmu->scl_id = hisi_djtag_get_sclid(client);
+
+	mn_pmu->name = devm_kasprintf(dev, GFP_KERNEL, "hisi_mn_%d",
+				      mn_pmu->scl_id);
+	mn_pmu->ops = &hisi_uncore_mn_ops;
+	mn_pmu->dev = dev;
+
+	/* Pick one core to use for cpumask attributes */
+	cpumask_set_cpu(smp_processor_id(), &mn_pmu->cpus);
+}
+
+static int hisi_pmu_mn_dev_probe(struct hisi_djtag_client *client)
+{
+	struct hisi_pmu *mn_pmu;
+	struct device *dev = &client->dev;
+	int ret;
+
+	mn_pmu = hisi_pmu_alloc(dev, HISI_IDX_MN_COUNTER_MAX);
+	if (!mn_pmu)
+		return -ENOMEM;
+
+	hisi_mn_pmu_init(mn_pmu, client);
+
+	ret = hisi_mn_init_data(mn_pmu, client);
+	if (ret)
+		goto fail;
+
+	mn_pmu->pmu = (struct pmu) {
+		.name = mn_pmu->name,
+		.task_ctx_nr = perf_invalid_context,
+		.event_init = hisi_uncore_pmu_event_init,
+		.pmu_enable = hisi_uncore_pmu_enable,
+		.pmu_disable = hisi_uncore_pmu_disable,
+		.add = hisi_uncore_pmu_add,
+		.del = hisi_uncore_pmu_del,
+		.start = hisi_uncore_pmu_start,
+		.stop = hisi_uncore_pmu_stop,
+		.read = hisi_uncore_pmu_read,
+		.attr_groups = hisi_mn_pmu_attr_groups,
+	};
+
+	ret = hisi_uncore_pmu_setup(mn_pmu, mn_pmu->name);
+	if (ret) {
+		dev_err(mn_pmu->dev, "hisi_uncore_pmu_init FAILED!!\n");
+		goto fail;
+	}
+
+	/* Set the drv data to MN pmu */
+	dev_set_drvdata(dev, mn_pmu);
+
+	return 0;
+
+fail:
+	return ret;
+}
+
+static int hisi_pmu_mn_dev_remove(struct hisi_djtag_client *client)
+{
+	struct hisi_pmu *mn_pmu;
+	struct device *dev = &client->dev;
+
+	mn_pmu = dev_get_drvdata(dev);
+	perf_pmu_unregister(&mn_pmu->pmu);
+	kfree(mn_pmu->name);
+
+	return 0;
+}
+
+static struct hisi_djtag_driver hisi_pmu_mn_driver = {
+	.driver = {
+		.name = "hisi-pmu-mn",
+		.of_match_table = mn_of_match,
+	},
+	.probe = hisi_pmu_mn_dev_probe,
+	.remove = hisi_pmu_mn_dev_remove,
+};
+
+static int __init hisi_pmu_mn_init(void)
+{
+	int ret;
+
+	ret = hisi_djtag_register_driver(THIS_MODULE, &hisi_pmu_mn_driver);
+	if (ret < 0) {
+		pr_err("hisi pmu MN init failed, ret=%d\n", ret);
+		return ret;
+	}
+
+	return 0;
+}
+module_init(hisi_pmu_mn_init);
+
+static void __exit hisi_pmu_mn_exit(void)
+{
+	hisi_djtag_unregister_driver(&hisi_pmu_mn_driver);
+}
+module_exit(hisi_pmu_mn_exit);
+
+MODULE_DESCRIPTION("HiSilicon SoC HIP0x MN PMU driver");
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Shaokun Zhang");
-- 
2.1.4

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