[PATCH v1 10/11] perf: hisi: Support for Hisilicon DDRC PMU.

From: Anurup M
Date: Wed Nov 02 2016 - 11:45:40 EST

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1. Add support for counting Hisilicon DDRC
statistics events in perf.
2. Support a total of 13 statistics events.
3. Events listed in /sys/devices/<pmu_name>/

Signed-off-by: Anurup M <anurup.m@xxxxxxxxxx>
Signed-off-by: Shaokun Zhang <zhangshaokun@xxxxxxxxxxxxx>
---
drivers/perf/hisilicon/Makefile | 2 +-
drivers/perf/hisilicon/hisi_uncore_ddrc.c | 444 ++++++++++++++++++++++++++++++
drivers/perf/hisilicon/hisi_uncore_ddrc.h | 73 +++++
3 files changed, 518 insertions(+), 1 deletion(-)
create mode 100644 drivers/perf/hisilicon/hisi_uncore_ddrc.c
create mode 100644 drivers/perf/hisilicon/hisi_uncore_ddrc.h

diff --git a/drivers/perf/hisilicon/Makefile b/drivers/perf/hisilicon/Makefile
index 8975104..8e9df2e 100644
--- a/drivers/perf/hisilicon/Makefile
+++ b/drivers/perf/hisilicon/Makefile
@@ -1 +1 @@
-obj-$(CONFIG_HISI_PMU) += hisi_uncore_pmu.o hisi_uncore_l3c.o hisi_uncore_mn.o
+obj-$(CONFIG_HISI_PMU) += hisi_uncore_pmu.o hisi_uncore_l3c.o hisi_uncore_mn.o hisi_uncore_ddrc.o
diff --git a/drivers/perf/hisilicon/hisi_uncore_ddrc.c b/drivers/perf/hisilicon/hisi_uncore_ddrc.c
new file mode 100644
index 0000000..b89a72e
--- /dev/null
+++ b/drivers/perf/hisilicon/hisi_uncore_ddrc.c
@@ -0,0 +1,444 @@
+/*
+ * HiSilicon SoC DDRC Hardware event counters support
+ *
+ * Copyright (C) 2016 Huawei Technologies Limited
+ * Author: Anurup M <anurup.m@xxxxxxxxxx>
+ *
+ * This code is based on the uncore PMU's 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/io.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/perf_event.h>
+#include "hisi_uncore_ddrc.h"
+
+static inline int hisi_ddrc_counter_valid(int idx, struct hisi_pmu *ddrc_pmu)
+{
+ return (idx >= 0 && idx < ddrc_pmu->num_counters);
+}
+
+static u32 hisi_ddrc_read32_relaxed(void __iomem *regs_base, u32 off)
+{
+ void __iomem *reg_addr = regs_base + off;
+
+ return readl_relaxed(reg_addr);
+}
+
+static void hisi_ddrc_write32(void __iomem *regs_base, u32 off, u32 val)
+{
+ void __iomem *reg_addr = regs_base + off;
+
+ writel(val, reg_addr);
+}
+
+static u32 hisi_read_ddrc_counter(struct hisi_ddrc_data *ddrc_hwmod_data,
+ unsigned long event_code, int idx)
+{
+ u32 value;
+ u32 reg_off;
+
+ reg_off = HISI_DDRC_FLUX_WR_REG_OFF + (event_code * 4);
+
+ value = hisi_ddrc_read32_relaxed(ddrc_hwmod_data->regs_base,
+ reg_off);
+ return value;
+}
+
+static u64 hisi_ddrc_event_update(struct perf_event *event,
+ struct hw_perf_event *hwc, int idx)
+{
+ struct hisi_pmu *ddrc_pmu = to_hisi_pmu(event->pmu);
+ struct hisi_ddrc_data *ddrc_hwmod_data;
+ u64 delta, prev_raw_count, new_raw_count = 0;
+
+ if (!hisi_ddrc_counter_valid(idx, ddrc_pmu)) {
+ dev_err(ddrc_pmu->dev,
+ "%s: Unsupported event index:%d!\n", __func__, idx);
+ return 0;
+ }
+
+ ddrc_hwmod_data = ddrc_pmu->hwmod_data;
+
+ /* Check if the DDRC data is initialized for this SCCL */
+ if (!ddrc_hwmod_data->regs_base) {
+ dev_err(ddrc_pmu->dev, "DDRC registers not mapped!\n");
+ return 0;
+ }
+
+ do {
+ prev_raw_count = local64_read(&hwc->prev_count);
+ new_raw_count =
+ hisi_read_ddrc_counter(ddrc_hwmod_data,
+ hwc->config_base, idx);
+ delta = (new_raw_count - prev_raw_count) &
+ HISI_MAX_PERIOD;
+
+ local64_add(delta, &event->count);
+ } while (local64_cmpxchg(
+ &hwc->prev_count, prev_raw_count, new_raw_count) !=
+ prev_raw_count);
+
+ return new_raw_count;
+}
+
+static u32 hisi_write_ddrc_counter(struct hisi_pmu *ddrc_pmu,
+ struct hw_perf_event *hwc, u32 value)
+{
+ struct hisi_ddrc_data *ddrc_hwmod_data = ddrc_pmu->hwmod_data;
+ u32 reg_off;
+ u32 event_code = hwc->config_base;
+
+ if (!(event_code >= HISI_HWEVENT_DDRC_FLUX_WR &&
+ event_code < HISI_HWEVENT_DDRC_MAX_EVENT)) {
+ dev_err(ddrc_pmu->dev, "Unknown DDR evevnt!");
+ return 0;
+ }
+
+ if (!ddrc_hwmod_data->regs_base) {
+ dev_err(ddrc_pmu->dev,
+ "DDR reg address not mapped!\n");
+ return 0;
+ }
+
+ reg_off = HISI_DDRC_FLUX_WR_REG_OFF + (event_code * 4);
+
+ hisi_ddrc_write32(ddrc_hwmod_data->regs_base,
+ reg_off, value);
+
+ return value;
+}
+
+static void hisi_ddrc_set_event_period(struct perf_event *event)
+{
+ struct hw_perf_event *hwc = &event->hw;
+ struct hisi_pmu *ddrc_pmu = to_hisi_pmu(event->pmu);
+ struct hisi_ddrc_data *ddrc_hwmod_data = ddrc_pmu->hwmod_data;
+ u32 event_code = hwc->config_base;
+ u32 reg_off;
+ u32 value;
+
+ reg_off = HISI_DDRC_FLUX_WR_REG_OFF + (event_code * 4);
+ /*
+ * For Hisilicon DDRC PMU we save the current counter value
+ * to prev_count, as we have enabled continuous counting for
+ * DDRC.
+ */
+ value = hisi_ddrc_read32_relaxed(ddrc_hwmod_data->regs_base,
+ reg_off);
+ local64_set(&hwc->prev_count, value);
+}
+
+static void hisi_clear_ddrc_event_idx(struct hisi_pmu *ddrc_pmu, int idx)
+{
+ struct hisi_ddrc_data *ddrc_hwmod_data = ddrc_pmu->hwmod_data;
+ void *bitmap_addr;
+
+ if (!hisi_ddrc_counter_valid(idx, ddrc_pmu)) {
+ dev_err(ddrc_pmu->dev,
+ "%s:Unsupported event index:%d!\n", __func__, idx);
+ return;
+ }
+
+ bitmap_addr = ddrc_hwmod_data->hisi_ddrc_event_used_mask;
+
+ __clear_bit(idx, bitmap_addr);
+}
+
+static int hisi_ddrc_get_event_idx(struct hisi_pmu *ddrc_pmu)
+{
+ struct hisi_ddrc_data *ddrc_hwmod_data = ddrc_pmu->hwmod_data;
+ int event_idx;
+
+ event_idx =
+ find_first_zero_bit(
+ ddrc_hwmod_data->hisi_ddrc_event_used_mask,
+ ddrc_pmu->num_counters);
+
+ if (event_idx == ddrc_pmu->num_counters)
+ return -EAGAIN;
+
+ __set_bit(event_idx,
+ ddrc_hwmod_data->hisi_ddrc_event_used_mask);
+
+ return event_idx;
+}
+
+static void hisi_free_ddrc_data(struct hisi_pmu *ddrc_pmu)
+{
+ kfree(ddrc_pmu->hwmod_data);
+ ddrc_pmu->hwmod_data = NULL;
+}
+
+static void init_hisi_ddr(void __iomem *reg_base)
+{
+ u32 value;
+
+ hisi_ddrc_write32(reg_base, HISI_DDRC_CTRL_PERF_REG_OFF, 0);
+
+ value = hisi_ddrc_read32_relaxed(reg_base, HISI_DDRC_CFG_PERF_REG_OFF);
+ value &= 0x2fffffff;
+ hisi_ddrc_write32(reg_base, HISI_DDRC_CFG_PERF_REG_OFF, value);
+
+ /* Enable Continuous counting */
+ hisi_ddrc_write32(reg_base, HISI_DDRC_CTRL_PERF_REG_OFF, 1);
+}
+
+static int init_hisi_ddrc_dts_data(struct platform_device *pdev,
+ struct hisi_ddrc_data *ddrc_hwmod_data)
+{
+ struct resource *res;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ /* Continue for zero entries */
+ if (!res) {
+ dev_err(&pdev->dev, "No DDR reg resorces!\n");
+ return -EINVAL;
+ }
+
+ if (!resource_size(res)) {
+ dev_err(&pdev->dev, "Zero DDR reg entry!\n");
+ return -EINVAL;
+ }
+
+ ddrc_hwmod_data->regs_base = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(ddrc_hwmod_data->regs_base))
+ return PTR_ERR(ddrc_hwmod_data->regs_base);
+
+ init_hisi_ddr(ddrc_hwmod_data->regs_base);
+
+ return 0;
+}
+
+static int init_hisi_ddrc_data(struct platform_device *pdev,
+ struct hisi_pmu *ddrc_pmu)
+{
+ struct device *dev = &pdev->dev;
+ int ret;
+
+ ddrc_pmu->hw_events.events = devm_kcalloc(dev,
+ ddrc_pmu->num_counters,
+ sizeof(*ddrc_pmu->hw_events.events),
+ GFP_KERNEL);
+ if (!ddrc_pmu->hw_events.events) {
+ ret = -ENOMEM;
+ goto fail;
+ }
+
+ raw_spin_lock_init(&ddrc_pmu->hw_events.pmu_lock);
+
+ init_hisi_ddrc_dts_data(pdev, ddrc_pmu->hwmod_data);
+
+ return 0;
+
+fail:
+ hisi_free_ddrc_data(ddrc_pmu);
+ return ret;
+}
+
+static struct attribute *hisi_ddrc_format_attr[] = {
+ HISI_PMU_FORMAT_ATTR(event, "config:0-11"),
+ NULL,
+};
+
+static struct attribute_group hisi_ddrc_format_group = {
+ .name = "format",
+ .attrs = hisi_ddrc_format_attr,
+};
+
+static struct attribute *hisi_ddrc_events_attr[] = {
+ HISI_PMU_EVENT_ATTR_STR(flux_write, "event=0x00"),
+ HISI_PMU_EVENT_ATTR_STR(flux_read, "event=0x01"),
+ HISI_PMU_EVENT_ATTR_STR(flux_write_cmd, "event=0x02"),
+ HISI_PMU_EVENT_ATTR_STR(flux_read_cmd, "event=0x03"),
+ HISI_PMU_EVENT_ATTR_STR(fluxid_write, "event=0x04"),
+ HISI_PMU_EVENT_ATTR_STR(fluxid_read, "event=0x05"),
+ HISI_PMU_EVENT_ATTR_STR(fluxid_write_cmd, "event=0x06"),
+ HISI_PMU_EVENT_ATTR_STR(fluxid_read_cmd, "event=0x07"),
+ HISI_PMU_EVENT_ATTR_STR(write_latency_cnt0,
+ "event=0x08"),
+ HISI_PMU_EVENT_ATTR_STR(read_latency_cnt0,
+ "event=0x09"),
+ HISI_PMU_EVENT_ATTR_STR(write_latency_cnt1,
+ "event=0x0A"),
+ HISI_PMU_EVENT_ATTR_STR(read_latency_cnt1,
+ "event=0x0B"),
+ HISI_PMU_EVENT_ATTR_STR(read_latency_cnt_inher,
+ "event=0x0C"),
+ NULL,
+};
+
+static struct attribute_group hisi_ddrc_events_group = {
+ .name = "events",
+ .attrs = hisi_ddrc_events_attr,
+};
+
+static struct attribute *hisi_ddrc_attrs[] = {
+ NULL,
+};
+
+struct attribute_group hisi_ddrc_attr_group = {
+ .attrs = hisi_ddrc_attrs,
+};
+
+static DEVICE_ATTR(cpumask, 0444, hisi_cpumask_sysfs_show, NULL);
+
+static struct attribute *hisi_ddrc_cpumask_attrs[] = {
+ &dev_attr_cpumask.attr,
+ NULL,
+};
+
+static const struct attribute_group hisi_ddrc_cpumask_attr_group = {
+ .attrs = hisi_ddrc_cpumask_attrs,
+};
+
+static const struct attribute_group *hisi_ddrc_pmu_attr_groups[] = {
+ &hisi_ddrc_attr_group,
+ &hisi_ddrc_format_group,
+ &hisi_ddrc_events_group,
+ &hisi_ddrc_cpumask_attr_group,
+ NULL,
+};
+
+static struct hisi_uncore_ops hisi_uncore_ddrc_ops = {
+ .set_event_period = hisi_ddrc_set_event_period,
+ .get_event_idx = hisi_ddrc_get_event_idx,
+ .clear_event_idx = hisi_clear_ddrc_event_idx,
+ .event_update = hisi_ddrc_event_update,
+ .write_counter = hisi_write_ddrc_counter,
+};
+
+static int hisi_ddrc_pmu_init(struct device *dev,
+ struct hisi_pmu *ddrc_pmu)
+{
+ struct hisi_ddrc_data *ddrc_hwmod_data;
+ struct hisi_ddrc_hwcfg *ddrc_hwcfg;
+ int ret;
+
+ /* Read common PMU properties */
+ ret = hisi_uncore_common_fwprop_read(dev, ddrc_pmu);
+ if (ret)
+ return ret;
+
+ ddrc_hwmod_data = kzalloc(sizeof(struct hisi_ddrc_data),
+ GFP_KERNEL);
+ if (!ddrc_hwmod_data)
+ return -ENOMEM;
+
+ ddrc_hwcfg = &ddrc_hwmod_data->ddrc_hwcfg;
+ if (of_property_read_u32(dev->of_node, "ch-id",
+ &ddrc_hwcfg->channel_id)) {
+ kfree(ddrc_hwmod_data);
+ return -EINVAL;
+ }
+
+ ddrc_pmu->name = kasprintf(GFP_KERNEL, "hisi_ddrc%d_%d",
+ ddrc_pmu->scl_id, ddrc_hwcfg->channel_id);
+
+ ddrc_pmu->ops = &hisi_uncore_ddrc_ops;
+ ddrc_pmu->hwmod_data = ddrc_hwmod_data;
+ ddrc_pmu->dev = dev;
+
+ /* Pick one core to use for cpumask attributes */
+ cpumask_set_cpu(smp_processor_id(), &ddrc_pmu->cpu);
+
+ return 0;
+}
+
+static const struct of_device_id ddrc_of_match[] = {
+ { .compatible = "hisilicon,hisi-pmu-ddrc-v1", },
+ {},
+};
+MODULE_DEVICE_TABLE(of, ddrc_of_match);
+
+static int hisi_pmu_ddrc_dev_probe(struct platform_device *pdev)
+{
+ struct hisi_pmu *ddrc_pmu;
+ struct device *dev = &pdev->dev;
+ const struct of_device_id *of_id;
+ int ret;
+
+ of_id = of_match_device(ddrc_of_match, dev);
+ if (!of_id)
+ return -EINVAL;
+
+ ddrc_pmu = hisi_pmu_alloc(dev);
+ if (IS_ERR(ddrc_pmu))
+ return PTR_ERR(ddrc_pmu);
+
+ ret = hisi_ddrc_pmu_init(dev, ddrc_pmu);
+ if (ret)
+ return ret;
+
+ ret = init_hisi_ddrc_data(pdev, ddrc_pmu);
+ if (ret)
+ goto fail_init;
+
+ /* Register with perf PMU */
+ ddrc_pmu->pmu = (struct pmu) {
+ .name = ddrc_pmu->name,
+ .task_ctx_nr = perf_invalid_context,
+ .event_init = hisi_uncore_pmu_event_init,
+ .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_ddrc_pmu_attr_groups,
+ };
+
+ ret = hisi_uncore_pmu_setup(ddrc_pmu, ddrc_pmu->name);
+ if (ret) {
+ dev_err(ddrc_pmu->dev, "hisi_uncore_pmu_init FAILED!!\n");
+ goto fail;
+ }
+
+ platform_set_drvdata(pdev, ddrc_pmu);
+
+ return 0;
+fail:
+ hisi_free_ddrc_data(ddrc_pmu);
+
+fail_init:
+ dev_err(ddrc_pmu->dev, "%s failed\n", __func__);
+
+ return ret;
+}
+
+static int hisi_pmu_ddrc_dev_remove(struct platform_device *pdev)
+{
+ struct hisi_pmu *ddrc_pmu = platform_get_drvdata(pdev);
+
+ perf_pmu_unregister(&ddrc_pmu->pmu);
+ hisi_free_ddrc_data(ddrc_pmu);
+ platform_set_drvdata(pdev, NULL);
+ return 0;
+}
+
+static struct platform_driver hisi_pmu_ddrc_driver = {
+ .driver = {
+ .name = "hisi-pmu-ddrc",
+ .of_match_table = ddrc_of_match,
+ },
+ .probe = hisi_pmu_ddrc_dev_probe,
+ .remove = hisi_pmu_ddrc_dev_remove,
+};
+module_platform_driver(hisi_pmu_ddrc_driver);
+
+MODULE_DESCRIPTION("HiSilicon SoC HIP0x DDRC PMU driver");
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Anurup M");
diff --git a/drivers/perf/hisilicon/hisi_uncore_ddrc.h b/drivers/perf/hisilicon/hisi_uncore_ddrc.h
new file mode 100644
index 0000000..89eab6b
--- /dev/null
+++ b/drivers/perf/hisilicon/hisi_uncore_ddrc.h
@@ -0,0 +1,73 @@
+/*
+ * HiSilicon SoC DDRC Hardware event counters support
+ *
+ * Copyright (C) 2016 Huawei Technologies Limited
+ * Author: Anurup M <anurup.m@xxxxxxxxxx>
+ *
+ * This code is based on the uncore PMU's 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/>.
+ */
+#ifndef __HISI_UNCORE_DDRC_H__
+#define __HISI_UNCORE_DDRC_H__
+
+#include "hisi_uncore_pmu.h"
+
+/*
+ * ARMv8 HiSilicon DDRC event types.
+ */
+enum armv8_hisi_ddrc_event_types {
+ HISI_HWEVENT_DDRC_FLUX_WR = 0x0,
+ HISI_HWEVENT_DDRC_FLUX_RD = 0x01,
+ HISI_HWEVENT_DDRC_FLUX_WCMD = 0x02,
+ HISI_HWEVENT_DDRC_FLUX_RCMD = 0x03,
+ HISI_HWEVENT_DDRC_FLUXID_WD = 0x04,
+ HISI_HWEVENT_DDRC_FLUXID_RD = 0x05,
+ HISI_HWEVENT_DDRC_FLUXID_WCMD = 0x06,
+ HISI_HWEVENT_DDRC_FLUXID_RCMD = 0x07,
+ HISI_HWEVENT_DDRC_WLAT_CNT0 = 0x08,
+ HISI_HWEVENT_DDRC_RLAT_CNT0 = 0x09,
+ HISI_HWEVENT_DDRC_WLAT_CNT1 = 0x0A,
+ HISI_HWEVENT_DDRC_RLAT_CNT1 = 0x0B,
+ HISI_HWEVENT_DDRC_INHERE_RLAT_CNT = 0x0C,
+ HISI_HWEVENT_DDRC_MAX_EVENT,
+};
+
+#define HISI_DDRC_CTRL_PERF_REG_OFF 0x010
+#define HISI_DDRC_CFG_PERF_REG_OFF 0x270
+#define HISI_DDRC_FLUX_WR_REG_OFF 0x380
+#define HISI_DDRC_FLUX_RD_REG_OFF 0x384
+#define HISI_DDRC_FLUX_WCMD_REG_OFF 0x388
+#define HISI_DDRC_FLUX_RCMD_REG_OFF 0x38C
+#define HISI_DDRC_FLUXID_WR_REG_OFF 0x390
+#define HISI_DDRC_FLUXID_RD_REG_OFF 0x394
+#define HISI_DDRC_FLUXID_WCMD_REG_OFF 0x398
+#define HISI_DDRC_FLUXID_RCMD_REG_OFF 0x39C
+#define HISI_DDRC_FLUX_WLATCNT0_REG_OFF 0x3A0
+#define HISI_DDRC_FLUX_RLAT_CNT0_REG_OFF 0x3A4
+#define HISI_DDRC_FLUX_WLATCNT1_REG_OFF 0x3A8
+#define HISI_DDRC_FLUX_RLAT_CNT1_REG_OFF 0x3AC
+
+struct hisi_ddrc_hwcfg {
+ u32 channel_id;
+};
+
+struct hisi_ddrc_data {
+ void __iomem *regs_base;
+ DECLARE_BITMAP(hisi_ddrc_event_used_mask,
+ HISI_HWEVENT_DDRC_MAX_EVENT);
+ struct hisi_ddrc_hwcfg ddrc_hwcfg;
+};
+
+#endif /* __HISI_UNCORE_DDRC_H__ */
--
2.1.4

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