Message-ID: <20230609075608.36559-3-hejunhao3@huawei.com>
Date:   Fri, 9 Jun 2023 15:56:07 +0800
From:   Junhao He <hejunhao3@...wei.com>
To:     <will@...nel.org>, <jonathan.cameron@...wei.com>,
        <linux-kernel@...r.kernel.org>, <mark.rutland@....com>
CC:     <linux-arm-kernel@...ts.infradead.org>,
        <linux-doc@...r.kernel.org>, <linuxarm@...wei.com>,
        <yangyicong@...wei.com>, <shenyang39@...wei.com>,
        <prime.zeng@...ilicon.com>, <hejunhao3@...wei.com>
Subject: [PATCH v4 2/3] drivers/perf: hisi: Add support for HiSilicon UC PMU driver

On HiSilicon Hip09 platform, there are 4 UC (unified cache) modules
on each chip CCL (CPU Cluster). UC is a cache that provides
coherence between NUMA and UMA domains. It is located between L2
and Memory System. Many PMU events are supported. Let's support
the UC PMU driver using the HiSilicon uncore PMU framework.

* rd_req_en : rd_req_en is the abbreviation of read request tracetag
enable and allows user to count only read operations. Details are listed
in the hisi-pmu document at Documentation/admin-guide/perf/hisi-pmu.rst

* srcid_en & srcid: Allows users to filter statistical information based
on specific CPU/ICL by srcid.
srcid_en depends on rd_req_en being enabled.

* uring_channel: Allows users to filter statistical information based on
the specified tx request uring channel.
uring_channel only supported events: [0x47 ~ 0x59].

Signed-off-by: Junhao He <hejunhao3@...wei.com>
Reviewed-by: Yicong Yang <yangyicong@...ilicon.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
---
 drivers/perf/hisilicon/Makefile             |   2 +-
 drivers/perf/hisilicon/hisi_uncore_pmu.c    |   4 +-
 drivers/perf/hisilicon/hisi_uncore_pmu.h    |   6 +
 drivers/perf/hisilicon/hisi_uncore_uc_pmu.c | 578 ++++++++++++++++++++
 4 files changed, 588 insertions(+), 2 deletions(-)
 create mode 100644 drivers/perf/hisilicon/hisi_uncore_uc_pmu.c

diff --git a/drivers/perf/hisilicon/Makefile b/drivers/perf/hisilicon/Makefile
index 4d2c9abe3372..48dcc8381ea7 100644
--- a/drivers/perf/hisilicon/Makefile
+++ b/drivers/perf/hisilicon/Makefile
@@ -1,7 +1,7 @@
 # SPDX-License-Identifier: GPL-2.0-only
 obj-$(CONFIG_HISI_PMU) += hisi_uncore_pmu.o hisi_uncore_l3c_pmu.o \
 			  hisi_uncore_hha_pmu.o hisi_uncore_ddrc_pmu.o hisi_uncore_sllc_pmu.o \
-			  hisi_uncore_pa_pmu.o hisi_uncore_cpa_pmu.o
+			  hisi_uncore_pa_pmu.o hisi_uncore_cpa_pmu.o hisi_uncore_uc_pmu.o
 
 obj-$(CONFIG_HISI_PCIE_PMU) += hisi_pcie_pmu.o
 obj-$(CONFIG_HNS3_PMU) += hns3_pmu.o
diff --git a/drivers/perf/hisilicon/hisi_uncore_pmu.c b/drivers/perf/hisilicon/hisi_uncore_pmu.c
index 2823f381930d..04031450d5fe 100644
--- a/drivers/perf/hisilicon/hisi_uncore_pmu.c
+++ b/drivers/perf/hisilicon/hisi_uncore_pmu.c
@@ -20,7 +20,6 @@
 
 #include "hisi_uncore_pmu.h"
 
-#define HISI_GET_EVENTID(ev) (ev->hw.config_base & 0xff)
 #define HISI_MAX_PERIOD(nr) (GENMASK_ULL((nr) - 1, 0))
 
 /*
@@ -226,6 +225,9 @@ int hisi_uncore_pmu_event_init(struct perf_event *event)
 	hwc->idx		= -1;
 	hwc->config_base	= event->attr.config;
 
+	if (hisi_pmu->ops->check_filter && hisi_pmu->ops->check_filter(event))
+		return -EINVAL;
+
 	/* Enforce to use the same CPU for all events in this PMU */
 	event->cpu = hisi_pmu->on_cpu;
 
diff --git a/drivers/perf/hisilicon/hisi_uncore_pmu.h b/drivers/perf/hisilicon/hisi_uncore_pmu.h
index a8d6d6905f3f..27b6122aa486 100644
--- a/drivers/perf/hisilicon/hisi_uncore_pmu.h
+++ b/drivers/perf/hisilicon/hisi_uncore_pmu.h
@@ -44,9 +44,15 @@
 		return FIELD_GET(GENMASK_ULL(hi, lo), event->attr.config);  \
 	}
 
+#define HISI_GET_EVENTID(ev) (ev->hw.config_base & 0xff)
+
+#define HISI_PMU_EVTYPE_BITS		8
+#define HISI_PMU_EVTYPE_SHIFT(idx)	((idx) % 4 * HISI_PMU_EVTYPE_BITS)
+
 struct hisi_pmu;
 
 struct hisi_uncore_ops {
+	int (*check_filter)(struct perf_event *event);
 	void (*write_evtype)(struct hisi_pmu *, int, u32);
 	int (*get_event_idx)(struct perf_event *);
 	u64 (*read_counter)(struct hisi_pmu *, struct hw_perf_event *);
diff --git a/drivers/perf/hisilicon/hisi_uncore_uc_pmu.c b/drivers/perf/hisilicon/hisi_uncore_uc_pmu.c
new file mode 100644
index 000000000000..63da05e5831c
--- /dev/null
+++ b/drivers/perf/hisilicon/hisi_uncore_uc_pmu.c
@@ -0,0 +1,578 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * HiSilicon SoC UC (unified cache) uncore Hardware event counters support
+ *
+ * Copyright (C) 2023 HiSilicon Limited
+ *
+ * This code is based on the uncore PMUs like hisi_uncore_l3c_pmu.
+ */
+#include <linux/cpuhotplug.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/list.h>
+#include <linux/mod_devicetable.h>
+#include <linux/property.h>
+
+#include "hisi_uncore_pmu.h"
+
+/* Dynamic CPU hotplug state used by UC PMU */
+static enum cpuhp_state hisi_uc_pmu_online;
+
+/* UC register definition */
+#define HISI_UC_INT_MASK_REG		0x0800
+#define HISI_UC_INT_STS_REG		0x0808
+#define HISI_UC_INT_CLEAR_REG		0x080c
+#define HISI_UC_TRACETAG_CTRL_REG	0x1b2c
+#define HISI_UC_TRACETAG_REQ_MSK	GENMASK(9, 7)
+#define HISI_UC_TRACETAG_MARK_EN	BIT(0)
+#define HISI_UC_TRACETAG_REQ_EN		(HISI_UC_TRACETAG_MARK_EN | BIT(2))
+#define HISI_UC_TRACETAG_SRCID_EN	BIT(3)
+#define HISI_UC_SRCID_CTRL_REG		0x1b40
+#define HISI_UC_SRCID_MSK		GENMASK(14, 1)
+#define HISI_UC_EVENT_CTRL_REG		0x1c00
+#define HISI_UC_EVENT_TRACETAG_EN	BIT(29)
+#define HISI_UC_EVENT_URING_MSK		GENMASK(28, 27)
+#define HISI_UC_EVENT_GLB_EN		BIT(26)
+#define HISI_UC_VERSION_REG		0x1cf0
+#define HISI_UC_EVTYPE_REGn(n)		(0x1d00 + (n) * 4)
+#define HISI_UC_EVTYPE_MASK		GENMASK(7, 0)
+#define HISI_UC_CNTR_REGn(n)		(0x1e00 + (n) * 8)
+
+#define HISI_UC_NR_COUNTERS		0x8
+#define HISI_UC_V2_NR_EVENTS		0xFF
+#define HISI_UC_CNTR_REG_BITS		64
+
+#define HISI_UC_RD_REQ_TRACETAG		0x4
+#define HISI_UC_URING_EVENT_MIN		0x47
+#define HISI_UC_URING_EVENT_MAX		0x59
+
+HISI_PMU_EVENT_ATTR_EXTRACTOR(rd_req_en, config1, 0, 0);
+HISI_PMU_EVENT_ATTR_EXTRACTOR(uring_channel, config1, 5, 4);
+HISI_PMU_EVENT_ATTR_EXTRACTOR(srcid, config1, 19, 6);
+HISI_PMU_EVENT_ATTR_EXTRACTOR(srcid_en, config1, 20, 20);
+
+static int hisi_uc_pmu_check_filter(struct perf_event *event)
+{
+	struct hisi_pmu *uc_pmu = to_hisi_pmu(event->pmu);
+
+	if (hisi_get_srcid_en(event) && !hisi_get_rd_req_en(event)) {
+		dev_err(uc_pmu->dev,
+			"rcid_en depends on rd_req_en being enabled!\n");
+		return -EINVAL;
+	}
+
+	if (!hisi_get_uring_channel(event))
+		return 0;
+
+	if ((HISI_GET_EVENTID(event) < HISI_UC_URING_EVENT_MIN) ||
+	    (HISI_GET_EVENTID(event) > HISI_UC_URING_EVENT_MAX))
+		dev_warn(uc_pmu->dev,
+			 "Only events: [%#x ~ %#x] support channel filtering!",
+			 HISI_UC_URING_EVENT_MIN, HISI_UC_URING_EVENT_MAX);
+
+	return 0;
+}
+
+static void hisi_uc_pmu_config_req_tracetag(struct perf_event *event)
+{
+	struct hisi_pmu *uc_pmu = to_hisi_pmu(event->pmu);
+	u32 val;
+
+	if (!hisi_get_rd_req_en(event))
+		return;
+
+	val = readl(uc_pmu->base + HISI_UC_TRACETAG_CTRL_REG);
+
+	/* The request-type has been configured */
+	if (FIELD_GET(HISI_UC_TRACETAG_REQ_MSK, val) == HISI_UC_RD_REQ_TRACETAG)
+		return;
+
+	/* Set request-type for tracetag, only read request is supported! */
+	val &= ~HISI_UC_TRACETAG_REQ_MSK;
+	val |= FIELD_PREP(HISI_UC_TRACETAG_REQ_MSK, HISI_UC_RD_REQ_TRACETAG);
+	val |= HISI_UC_TRACETAG_REQ_EN;
+	writel(val, uc_pmu->base + HISI_UC_TRACETAG_CTRL_REG);
+}
+
+static void hisi_uc_pmu_clear_req_tracetag(struct perf_event *event)
+{
+	struct hisi_pmu *uc_pmu = to_hisi_pmu(event->pmu);
+	u32 val;
+
+	if (!hisi_get_rd_req_en(event))
+		return;
+
+	val = readl(uc_pmu->base + HISI_UC_TRACETAG_CTRL_REG);
+
+	/* Do nothing, the request-type tracetag has been cleaned up */
+	if (FIELD_GET(HISI_UC_TRACETAG_REQ_MSK, val) == 0)
+		return;
+
+	/* Clear request-type */
+	val &= ~HISI_UC_TRACETAG_REQ_MSK;
+	val &= ~HISI_UC_TRACETAG_REQ_EN;
+	writel(val, uc_pmu->base + HISI_UC_TRACETAG_CTRL_REG);
+}
+
+static void hisi_uc_pmu_config_srcid_tracetag(struct perf_event *event)
+{
+	struct hisi_pmu *uc_pmu = to_hisi_pmu(event->pmu);
+	u32 val;
+
+	if (!hisi_get_srcid_en(event))
+		return;
+
+	val = readl(uc_pmu->base + HISI_UC_TRACETAG_CTRL_REG);
+
+	/* Do nothing, the source id has been configured */
+	if (FIELD_GET(HISI_UC_TRACETAG_SRCID_EN, val))
+		return;
+
+	/* Enable source id tracetag */
+	val |= HISI_UC_TRACETAG_SRCID_EN;
+	writel(val, uc_pmu->base + HISI_UC_TRACETAG_CTRL_REG);
+
+	val = readl(uc_pmu->base + HISI_UC_SRCID_CTRL_REG);
+	val &= ~HISI_UC_SRCID_MSK;
+	val |= FIELD_PREP(HISI_UC_SRCID_MSK, hisi_get_srcid(event));
+	writel(val, uc_pmu->base + HISI_UC_SRCID_CTRL_REG);
+
+	/* Depend on request-type tracetag enabled */
+	hisi_uc_pmu_config_req_tracetag(event);
+}
+
+static void hisi_uc_pmu_clear_srcid_tracetag(struct perf_event *event)
+{
+	struct hisi_pmu *uc_pmu = to_hisi_pmu(event->pmu);
+	u32 val;
+
+	if (!hisi_get_srcid_en(event))
+		return;
+
+	val = readl(uc_pmu->base + HISI_UC_TRACETAG_CTRL_REG);
+
+	/* Do nothing, the source id has been cleaned up */
+	if (FIELD_GET(HISI_UC_TRACETAG_SRCID_EN, val) == 0)
+		return;
+
+	hisi_uc_pmu_clear_req_tracetag(event);
+
+	/* Disable source id tracetag */
+	val &= ~HISI_UC_TRACETAG_SRCID_EN;
+	writel(val, uc_pmu->base + HISI_UC_TRACETAG_CTRL_REG);
+
+	val = readl(uc_pmu->base + HISI_UC_SRCID_CTRL_REG);
+	val &= ~HISI_UC_SRCID_MSK;
+	writel(val, uc_pmu->base + HISI_UC_SRCID_CTRL_REG);
+}
+
+static void hisi_uc_pmu_config_uring_channel(struct perf_event *event)
+{
+	struct hisi_pmu *uc_pmu = to_hisi_pmu(event->pmu);
+	u32 uring_channel = hisi_get_uring_channel(event);
+	u32 val;
+
+	/* Do nothing if not being set or is set explicitly to zero (default) */
+	if (uring_channel == 0)
+		return;
+
+	val = readl(uc_pmu->base + HISI_UC_EVENT_CTRL_REG);
+
+	/* Do nothing, the uring_channel has been configured */
+	if (uring_channel == FIELD_GET(HISI_UC_EVENT_URING_MSK, val))
+		return;
+
+	val &= ~HISI_UC_EVENT_URING_MSK;
+	val |= FIELD_PREP(HISI_UC_EVENT_URING_MSK, uring_channel);
+	writel(val, uc_pmu->base + HISI_UC_EVENT_CTRL_REG);
+}
+
+static void hisi_uc_pmu_clear_uring_channel(struct perf_event *event)
+{
+	struct hisi_pmu *uc_pmu = to_hisi_pmu(event->pmu);
+	u32 val;
+
+	/* Do nothing if not being set or is set explicitly to zero (default) */
+	if (hisi_get_uring_channel(event) == 0)
+		return;
+
+	val = readl(uc_pmu->base + HISI_UC_EVENT_CTRL_REG);
+
+	/* Do nothing, the uring_channel has been cleaned up */
+	if (FIELD_GET(HISI_UC_EVENT_URING_MSK, val) == 0)
+		return;
+
+	val &= ~HISI_UC_EVENT_URING_MSK;
+	writel(val, uc_pmu->base + HISI_UC_EVENT_CTRL_REG);
+}
+
+static void hisi_uc_pmu_enable_filter(struct perf_event *event)
+{
+	if (event->attr.config1 == 0)
+		return;
+
+	hisi_uc_pmu_config_uring_channel(event);
+	hisi_uc_pmu_config_req_tracetag(event);
+	hisi_uc_pmu_config_srcid_tracetag(event);
+}
+
+static void hisi_uc_pmu_disable_filter(struct perf_event *event)
+{
+	if (event->attr.config1 == 0)
+		return;
+
+	hisi_uc_pmu_clear_srcid_tracetag(event);
+	hisi_uc_pmu_clear_req_tracetag(event);
+	hisi_uc_pmu_clear_uring_channel(event);
+}
+
+static void hisi_uc_pmu_write_evtype(struct hisi_pmu *uc_pmu, int idx, u32 type)
+{
+	u32 val;
+
+	/*
+	 * Select the appropriate event select register.
+	 * There are 2 32-bit event select registers for the
+	 * 8 hardware counters, each event code is 8-bit wide.
+	 */
+	val = readl(uc_pmu->base + HISI_UC_EVTYPE_REGn(idx / 4));
+	val &= ~(HISI_UC_EVTYPE_MASK << HISI_PMU_EVTYPE_SHIFT(idx));
+	val |= (type << HISI_PMU_EVTYPE_SHIFT(idx));
+	writel(val, uc_pmu->base + HISI_UC_EVTYPE_REGn(idx / 4));
+}
+
+static void hisi_uc_pmu_start_counters(struct hisi_pmu *uc_pmu)
+{
+	u32 val;
+
+	val = readl(uc_pmu->base + HISI_UC_EVENT_CTRL_REG);
+	val |= HISI_UC_EVENT_GLB_EN;
+	writel(val, uc_pmu->base + HISI_UC_EVENT_CTRL_REG);
+}
+
+static void hisi_uc_pmu_stop_counters(struct hisi_pmu *uc_pmu)
+{
+	u32 val;
+
+	val = readl(uc_pmu->base + HISI_UC_EVENT_CTRL_REG);
+	val &= ~HISI_UC_EVENT_GLB_EN;
+	writel(val, uc_pmu->base + HISI_UC_EVENT_CTRL_REG);
+}
+
+static void hisi_uc_pmu_enable_counter(struct hisi_pmu *uc_pmu,
+					struct hw_perf_event *hwc)
+{
+	u32 val;
+
+	/* Enable counter index */
+	val = readl(uc_pmu->base + HISI_UC_EVENT_CTRL_REG);
+	val |= (1 << hwc->idx);
+	writel(val, uc_pmu->base + HISI_UC_EVENT_CTRL_REG);
+}
+
+static void hisi_uc_pmu_disable_counter(struct hisi_pmu *uc_pmu,
+					struct hw_perf_event *hwc)
+{
+	u32 val;
+
+	/* Clear counter index */
+	val = readl(uc_pmu->base + HISI_UC_EVENT_CTRL_REG);
+	val &= ~(1 << hwc->idx);
+	writel(val, uc_pmu->base + HISI_UC_EVENT_CTRL_REG);
+}
+
+static u64 hisi_uc_pmu_read_counter(struct hisi_pmu *uc_pmu,
+				    struct hw_perf_event *hwc)
+{
+	return readq(uc_pmu->base + HISI_UC_CNTR_REGn(hwc->idx));
+}
+
+static void hisi_uc_pmu_write_counter(struct hisi_pmu *uc_pmu,
+				      struct hw_perf_event *hwc, u64 val)
+{
+	writeq(val, uc_pmu->base + HISI_UC_CNTR_REGn(hwc->idx));
+}
+
+static void hisi_uc_pmu_enable_counter_int(struct hisi_pmu *uc_pmu,
+					   struct hw_perf_event *hwc)
+{
+	u32 val;
+
+	val = readl(uc_pmu->base + HISI_UC_INT_MASK_REG);
+	val &= ~(1 << hwc->idx);
+	writel(val, uc_pmu->base + HISI_UC_INT_MASK_REG);
+}
+
+static void hisi_uc_pmu_disable_counter_int(struct hisi_pmu *uc_pmu,
+					    struct hw_perf_event *hwc)
+{
+	u32 val;
+
+	val = readl(uc_pmu->base + HISI_UC_INT_MASK_REG);
+	val |= (1 << hwc->idx);
+	writel(val, uc_pmu->base + HISI_UC_INT_MASK_REG);
+}
+
+static u32 hisi_uc_pmu_get_int_status(struct hisi_pmu *uc_pmu)
+{
+	return readl(uc_pmu->base + HISI_UC_INT_STS_REG);
+}
+
+static void hisi_uc_pmu_clear_int_status(struct hisi_pmu *uc_pmu, int idx)
+{
+	writel(1 << idx, uc_pmu->base + HISI_UC_INT_CLEAR_REG);
+}
+
+static int hisi_uc_pmu_init_data(struct platform_device *pdev,
+				 struct hisi_pmu *uc_pmu)
+{
+	/*
+	 * Use SCCL (Super CPU Cluster) ID and CCL (CPU Cluster) ID to
+	 * identify the topology information of UC PMU devices in the chip.
+	 * They have some CCLs per SCCL and then 4 UC PMU per CCL.
+	 */
+	if (device_property_read_u32(&pdev->dev, "hisilicon,scl-id",
+				     &uc_pmu->sccl_id)) {
+		dev_err(&pdev->dev, "Can not read uc sccl-id!\n");
+		return -EINVAL;
+	}
+
+	if (device_property_read_u32(&pdev->dev, "hisilicon,ccl-id",
+				     &uc_pmu->ccl_id)) {
+		dev_err(&pdev->dev, "Can not read uc ccl-id!\n");
+		return -EINVAL;
+	}
+
+	if (device_property_read_u32(&pdev->dev, "hisilicon,sub-id",
+				     &uc_pmu->sub_id)) {
+		dev_err(&pdev->dev, "Can not read sub-id!\n");
+		return -EINVAL;
+	}
+
+	uc_pmu->base = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(uc_pmu->base)) {
+		dev_err(&pdev->dev, "ioremap failed for uc_pmu resource\n");
+		return PTR_ERR(uc_pmu->base);
+	}
+
+	uc_pmu->identifier = readl(uc_pmu->base + HISI_UC_VERSION_REG);
+
+	return 0;
+}
+
+static struct attribute *hisi_uc_pmu_format_attr[] = {
+	HISI_PMU_FORMAT_ATTR(event, "config:0-7"),
+	HISI_PMU_FORMAT_ATTR(rd_req_en, "config1:0-0"),
+	HISI_PMU_FORMAT_ATTR(uring_channel, "config1:4-5"),
+	HISI_PMU_FORMAT_ATTR(srcid, "config1:6-19"),
+	HISI_PMU_FORMAT_ATTR(srcid_en, "config1:20-20"),
+	NULL
+};
+
+static const struct attribute_group hisi_uc_pmu_format_group = {
+	.name = "format",
+	.attrs = hisi_uc_pmu_format_attr,
+};
+
+static struct attribute *hisi_uc_pmu_events_attr[] = {
+	HISI_PMU_EVENT_ATTR(sq_time,		0x00),
+	HISI_PMU_EVENT_ATTR(pq_time,		0x01),
+	HISI_PMU_EVENT_ATTR(hbm_time,		0x02),
+	HISI_PMU_EVENT_ATTR(iq_comp_time_cring,	0x03),
+	HISI_PMU_EVENT_ATTR(iq_comp_time_uring,	0x05),
+	HISI_PMU_EVENT_ATTR(cpu_rd,		0x10),
+	HISI_PMU_EVENT_ATTR(cpu_rd64,		0x17),
+	HISI_PMU_EVENT_ATTR(cpu_rs64,		0x19),
+	HISI_PMU_EVENT_ATTR(cpu_mru,		0x1a),
+	HISI_PMU_EVENT_ATTR(cycles,		0x9c),
+	HISI_PMU_EVENT_ATTR(spipe_hit,		0xb3),
+	HISI_PMU_EVENT_ATTR(hpipe_hit,		0xdb),
+	HISI_PMU_EVENT_ATTR(cring_rxdat_cnt,	0xfa),
+	HISI_PMU_EVENT_ATTR(cring_txdat_cnt,	0xfb),
+	HISI_PMU_EVENT_ATTR(uring_rxdat_cnt,	0xfc),
+	HISI_PMU_EVENT_ATTR(uring_txdat_cnt,	0xfd),
+	NULL
+};
+
+static const struct attribute_group hisi_uc_pmu_events_group = {
+	.name = "events",
+	.attrs = hisi_uc_pmu_events_attr,
+};
+
+static DEVICE_ATTR(cpumask, 0444, hisi_cpumask_sysfs_show, NULL);
+
+static struct attribute *hisi_uc_pmu_cpumask_attrs[] = {
+	&dev_attr_cpumask.attr,
+	NULL,
+};
+
+static const struct attribute_group hisi_uc_pmu_cpumask_attr_group = {
+	.attrs = hisi_uc_pmu_cpumask_attrs,
+};
+
+static struct device_attribute hisi_uc_pmu_identifier_attr =
+	__ATTR(identifier, 0444, hisi_uncore_pmu_identifier_attr_show, NULL);
+
+static struct attribute *hisi_uc_pmu_identifier_attrs[] = {
+	&hisi_uc_pmu_identifier_attr.attr,
+	NULL
+};
+
+static const struct attribute_group hisi_uc_pmu_identifier_group = {
+	.attrs = hisi_uc_pmu_identifier_attrs,
+};
+
+static const struct attribute_group *hisi_uc_pmu_attr_groups[] = {
+	&hisi_uc_pmu_format_group,
+	&hisi_uc_pmu_events_group,
+	&hisi_uc_pmu_cpumask_attr_group,
+	&hisi_uc_pmu_identifier_group,
+	NULL
+};
+
+static const struct hisi_uncore_ops hisi_uncore_uc_pmu_ops = {
+	.check_filter		= hisi_uc_pmu_check_filter,
+	.write_evtype		= hisi_uc_pmu_write_evtype,
+	.get_event_idx		= hisi_uncore_pmu_get_event_idx,
+	.start_counters		= hisi_uc_pmu_start_counters,
+	.stop_counters		= hisi_uc_pmu_stop_counters,
+	.enable_counter		= hisi_uc_pmu_enable_counter,
+	.disable_counter	= hisi_uc_pmu_disable_counter,
+	.enable_counter_int	= hisi_uc_pmu_enable_counter_int,
+	.disable_counter_int	= hisi_uc_pmu_disable_counter_int,
+	.write_counter		= hisi_uc_pmu_write_counter,
+	.read_counter		= hisi_uc_pmu_read_counter,
+	.get_int_status		= hisi_uc_pmu_get_int_status,
+	.clear_int_status	= hisi_uc_pmu_clear_int_status,
+	.enable_filter		= hisi_uc_pmu_enable_filter,
+	.disable_filter		= hisi_uc_pmu_disable_filter,
+};
+
+static int hisi_uc_pmu_dev_probe(struct platform_device *pdev,
+				 struct hisi_pmu *uc_pmu)
+{
+	int ret;
+
+	ret = hisi_uc_pmu_init_data(pdev, uc_pmu);
+	if (ret)
+		return ret;
+
+	ret = hisi_uncore_pmu_init_irq(uc_pmu, pdev);
+	if (ret)
+		return ret;
+
+	uc_pmu->pmu_events.attr_groups = hisi_uc_pmu_attr_groups;
+	uc_pmu->check_event = HISI_UC_EVTYPE_MASK;
+	uc_pmu->ops = &hisi_uncore_uc_pmu_ops;
+	uc_pmu->counter_bits = HISI_UC_CNTR_REG_BITS;
+	uc_pmu->num_counters = HISI_UC_NR_COUNTERS;
+	uc_pmu->dev = &pdev->dev;
+	uc_pmu->on_cpu = -1;
+
+	return 0;
+}
+
+static void hisi_uc_pmu_remove_cpuhp_instance(void *hotplug_node)
+{
+	cpuhp_state_remove_instance_nocalls(hisi_uc_pmu_online, hotplug_node);
+}
+
+static void hisi_uc_pmu_unregister_pmu(void *pmu)
+{
+	perf_pmu_unregister(pmu);
+}
+
+static int hisi_uc_pmu_probe(struct platform_device *pdev)
+{
+	struct hisi_pmu *uc_pmu;
+	char *name;
+	int ret;
+
+	uc_pmu = devm_kzalloc(&pdev->dev, sizeof(*uc_pmu), GFP_KERNEL);
+	if (!uc_pmu)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, uc_pmu);
+
+	ret = hisi_uc_pmu_dev_probe(pdev, uc_pmu);
+	if (ret)
+		return ret;
+
+	name = devm_kasprintf(&pdev->dev, GFP_KERNEL, "hisi_sccl%d_uc%d_%u",
+			      uc_pmu->sccl_id, uc_pmu->ccl_id, uc_pmu->sub_id);
+	if (!name)
+		return -ENOMEM;
+
+	ret = cpuhp_state_add_instance(hisi_uc_pmu_online, &uc_pmu->node);
+	if (ret)
+		return dev_err_probe(&pdev->dev, ret, "Error registering hotplug\n");
+
+	ret = devm_add_action_or_reset(&pdev->dev,
+				       hisi_uc_pmu_remove_cpuhp_instance,
+				       &uc_pmu->node);
+	if (ret)
+		return ret;
+
+	hisi_pmu_init(uc_pmu, THIS_MODULE);
+
+	ret = perf_pmu_register(&uc_pmu->pmu, name, -1);
+	if (ret)
+		return ret;
+
+	return devm_add_action_or_reset(&pdev->dev,
+					hisi_uc_pmu_unregister_pmu,
+					&uc_pmu->pmu);
+}
+
+static const struct acpi_device_id hisi_uc_pmu_acpi_match[] = {
+	{ "HISI0291", },
+	{}
+};
+MODULE_DEVICE_TABLE(acpi, hisi_uc_pmu_acpi_match);
+
+static struct platform_driver hisi_uc_pmu_driver = {
+	.driver = {
+		.name = "hisi_uc_pmu",
+		.acpi_match_table = hisi_uc_pmu_acpi_match,
+		/*
+		 * We have not worked out a safe bind/unbind process,
+		 * Forcefully unbinding during sampling will lead to a
+		 * kernel panic, so this is not supported yet.
+		 */
+		.suppress_bind_attrs = true,
+	},
+	.probe = hisi_uc_pmu_probe,
+};
+
+static int __init hisi_uc_pmu_module_init(void)
+{
+	int ret;
+
+	ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN,
+				      "perf/hisi/uc:online",
+				      hisi_uncore_pmu_online_cpu,
+				      hisi_uncore_pmu_offline_cpu);
+	if (ret < 0) {
+		pr_err("UC PMU: Error setup hotplug, ret = %d\n", ret);
+		return ret;
+	}
+	hisi_uc_pmu_online = ret;
+
+	ret = platform_driver_register(&hisi_uc_pmu_driver);
+	if (ret)
+		cpuhp_remove_multi_state(hisi_uc_pmu_online);
+
+	return ret;
+}
+module_init(hisi_uc_pmu_module_init);
+
+static void __exit hisi_uc_pmu_module_exit(void)
+{
+	platform_driver_unregister(&hisi_uc_pmu_driver);
+	cpuhp_remove_multi_state(hisi_uc_pmu_online);
+}
+module_exit(hisi_uc_pmu_module_exit);
+
+MODULE_DESCRIPTION("HiSilicon SoC UC uncore PMU driver");
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Junhao He <hejunhao3@...wei.com>");
-- 
2.33.0

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