[PATCH v8 8/9] drivers: perf: hisi: Miscellanous node(MN) event counting in perf
Shaokun Zhang
zhangshaokun at hisilicon.com
Mon May 22 05:48:37 PDT 2017
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.
4. The driver supports DT and ACPI mode.
Signed-off-by: Shaokun Zhang <zhangshaokun at hisilicon.com>
Signed-off-by: Anurup M <anurup.m at huawei.com>
---
drivers/perf/hisilicon/Makefile | 2 +-
drivers/perf/hisilicon/hisi_uncore_mn.c | 468 ++++++++++++++++++++++++++++++++
2 files changed, 469 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..89e28ae
--- /dev/null
+++ b/drivers/perf/hisilicon/hisi_uncore_mn.c
@@ -0,0 +1,468 @@
+/*
+ * HiSilicon SoC MN Hardware event counters support
+ *
+ * Copyright (C) 2017 Hisilicon Limited
+ * Author: Shaokun Zhang <zhangshaokun at hisilicon.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/acpi.h>
+#include <linux/bitmap.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/perf_event.h>
+#include "hisi_uncore_pmu.h"
+
+/*
+ * ARMv8 HiSilicon MN event types.
+ */
+enum hisi_mn_pmu_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 hisi_mn_pmu_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_pmu_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 u64 hisi_mn_pmu_read_counter(struct hisi_pmu *mn_pmu, int cntr_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 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 void hisi_mn_pmu_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_pmu_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_pmu_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_pmu_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_pmu_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_pmu_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_pmu_clear_event_idx(struct hisi_pmu *mn_pmu, int idx)
+{
+ if (!hisi_mn_pmu_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_pmu_get_event_idx(struct perf_event *event)
+{
+ struct hisi_pmu *mn_pmu = to_hisi_pmu(event->pmu);
+ 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, used_mask);
+
+ return event_idx;
+}
+
+static const struct of_device_id hisi_mn_pmu_of_match[] = {
+ { .compatible = "hisilicon,hip05-pmu-mn-v1", },
+ { .compatible = "hisilicon,hip06-pmu-mn-v1", },
+ { .compatible = "hisilicon,hip07-pmu-mn-v2", },
+ {},
+};
+MODULE_DEVICE_TABLE(of, hisi_mn_pmu_of_match);
+
+static const struct acpi_device_id hisi_mn_pmu_acpi_match[] = {
+ { "HISI0221", },
+ { "HISI0222", },
+ {},
+};
+MODULE_DEVICE_TABLE(acpi, hisi_mn_pmu_acpi_match);
+
+static struct attribute *hisi_mn_pmu_format_attr[] = {
+ HISI_PMU_FORMAT_ATTR(event, "config:0-7"),
+ NULL,
+};
+
+static const struct attribute_group hisi_mn_pmu_format_group = {
+ .name = "format",
+ .attrs = hisi_mn_pmu_format_attr,
+};
+
+static struct attribute *hisi_mn_pmu_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_pmu_events_group = {
+ .name = "events",
+ .attrs = hisi_mn_pmu_events_attr,
+};
+
+static struct attribute *hisi_mn_pmu_attrs[] = {
+ NULL,
+};
+
+static const struct attribute_group hisi_mn_pmu_attr_group = {
+ .attrs = hisi_mn_pmu_attrs,
+};
+
+static DEVICE_ATTR(cpumask, 0444, hisi_cpumask_sysfs_show, NULL);
+
+static struct attribute *hisi_mn_pmu_cpumask_attrs[] = {
+ &dev_attr_cpumask.attr,
+ NULL,
+};
+
+static const struct attribute_group hisi_mn_pmu_cpumask_attr_group = {
+ .attrs = hisi_mn_pmu_cpumask_attrs,
+};
+
+static const struct attribute_group *hisi_mn_pmu_pmu_attr_groups[] = {
+ &hisi_mn_pmu_attr_group,
+ &hisi_mn_pmu_format_group,
+ &hisi_mn_pmu_events_group,
+ &hisi_mn_pmu_cpumask_attr_group,
+ NULL,
+};
+
+static struct hisi_uncore_ops hisi_uncore_mn_ops = {
+ .set_evtype = hisi_mn_pmu_set_evtype,
+ .clear_evtype = hisi_mn_pmu_clear_evtype,
+ .set_event_period = hisi_uncore_pmu_set_event_period,
+ .get_event_idx = hisi_mn_pmu_get_event_idx,
+ .clear_event_idx = hisi_mn_pmu_clear_event_idx,
+ .event_update = hisi_uncore_pmu_event_update,
+ .start_counters = hisi_mn_pmu_start_counters,
+ .stop_counters = hisi_mn_pmu_stop_counters,
+ .write_counter = hisi_mn_pmu_write_counter,
+ .read_counter = hisi_mn_pmu_read_counter,
+};
+
+/* Use hrtimer when no IRQ, to poll for avoiding counter overflow */
+static void hisi_mn_pmu_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 void hisi_mn_pmu_init_data(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->counter_bits = 32;
+ mn_pmu->num_active = 0;
+ mn_pmu->scl_id = hisi_djtag_get_sclid(client);
+
+ mn_pmu->name = kasprintf(GFP_KERNEL, "hisi_mn_pmu_%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);
+
+ /*
+ * Use poll method to avoid counter overflow as overflow IRQ
+ * is not supported in v1, v2 hardware.
+ */
+ hisi_mn_pmu_hrtimer_init(mn_pmu);
+}
+
+static int hisi_mn_pmu_dev_probe(struct hisi_pmu *mn_pmu,
+ struct hisi_djtag_client *client)
+{
+ struct hisi_mn_data *mn_data;
+ struct device *dev = &client->dev;
+ 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;
+
+ if (dev->of_node) {
+ const struct of_device_id *of_id;
+
+ of_id = of_match_device(hisi_mn_pmu_of_match, dev);
+ if (!of_id) {
+ dev_err(dev, "DT: Match device fail!\n");
+ return -EINVAL;
+ }
+ } else if (ACPI_COMPANION(dev)) {
+ const struct acpi_device_id *acpi_id;
+
+ acpi_id = acpi_match_device(hisi_mn_pmu_acpi_match, dev);
+ if (!acpi_id) {
+ dev_err(dev, "ACPI: Match device fail!\n");
+ return -EINVAL;
+ }
+ } else
+ 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;
+ }
+
+ hisi_mn_pmu_init_data(mn_pmu, client);
+
+ return 0;
+}
+
+static int hisi_mn_pmu_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;
+
+ ret = hisi_mn_pmu_dev_probe(mn_pmu, client);
+ if (ret)
+ return ret;
+
+ 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_pmu_attr_groups,
+ };
+
+ ret = hisi_uncore_pmu_setup(mn_pmu, mn_pmu->name);
+ if (ret) {
+ dev_err(dev, "hisi_uncore_pmu_init FAILED!!\n");
+ kfree(mn_pmu->name);
+ return ret;
+ }
+
+ /* Set the drv data to MN pmu */
+ dev_set_drvdata(dev, mn_pmu);
+
+ return 0;
+}
+
+static int hisi_mn_pmu_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_mn_pmu_driver = {
+ .driver = {
+ .name = "hisi-mn-pmu",
+ .of_match_table = hisi_mn_pmu_of_match,
+ .acpi_match_table = ACPI_PTR(hisi_mn_pmu_acpi_match),
+ },
+ .probe = hisi_mn_pmu_probe,
+ .remove = hisi_mn_pmu_remove,
+};
+
+static int __init hisi_mn_pmu_init(void)
+{
+ int ret;
+
+ ret = hisi_djtag_register_driver(THIS_MODULE, &hisi_mn_pmu_driver);
+ if (ret < 0) {
+ pr_err("hisi pmu MN init failed, ret=%d\n", ret);
+ return ret;
+ }
+
+ return 0;
+}
+module_init(hisi_mn_pmu_init);
+
+static void __exit hisi_mn_pmu_exit(void)
+{
+ hisi_djtag_unregister_driver(&hisi_mn_pmu_driver);
+}
+module_exit(hisi_mn_pmu_exit);
+
+MODULE_DESCRIPTION("HiSilicon SoC HIP0x MN PMU driver");
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Shaokun Zhang");
--
1.9.1
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