[RESEND PATCH 0/2] Add ThunderX2 SoC Performance Monitoring Unit driver

[RESEND PATCH 0/2] Add ThunderX2 SoC Performance Monitoring Unit driver

[Ganapatrao Kulkarni]

This adds PMU driver for Cavium's ThunderX2 SoC UNCORE devices.
The SoC has PMU support in its L3 cache controller (L3C) and in the
DDR4 Memory Controller (DMC).

Ganapatrao Kulkarni (2):
  perf: uncore: Adding documentation for ThunderX2 pmu uncore driver
  perf: ThunderX2: Add Cavium Thunderx2 SoC UNCORE PMU driver

 Documentation/perf/thunderx2-pmu.txt |  60 +++
 drivers/perf/Kconfig                 |   9 +
 drivers/perf/Makefile                |   1 +
 drivers/perf/thunderx2_pmu.c         | 965 +++++++++++++++++++++++++++++++++++
 4 files changed, 1035 insertions(+)
 create mode 100644 Documentation/perf/thunderx2-pmu.txt
 create mode 100644 drivers/perf/thunderx2_pmu.c

-- 
1.8.1.4

[RESEND PATCH 1/2] perf: uncore: Adding documentation for ThunderX2 pmu uncore driver

[Ganapatrao Kulkarni]

Documentation for the UNCORE PMUs on Cavium's ThunderX2 SoC.
The SoC has PMU support in its L3 cache controller (L3C) and in the
DDR4 Memory Controller (DMC).

Signed-off-by: Ganapatrao Kulkarni <ganapatrao.kulkarni@cavium.com>
---
 Documentation/perf/thunderx2-pmu.txt | 60 ++++++++++++++++++++++++++++++++++++
 1 file changed, 60 insertions(+)
 create mode 100644 Documentation/perf/thunderx2-pmu.txt

diff --git a/Documentation/perf/thunderx2-pmu.txt b/Documentation/perf/thunderx2-pmu.txt
new file mode 100644
index 0000000..eb8df9a
--- /dev/null
+++ b/Documentation/perf/thunderx2-pmu.txt
@@ -0,0 +1,60 @@
+
+Cavium ThunderX2 SoC Performance Monitoring Unit (PMU UNCORE)
+=============================================================
+
+ThunderX2 SoC PMU consists of independent system wide PMUs such as
+Level 3 Cache(L3C) and DDR4 Memory Controller(DMC).
+
+DMC: There are 8 independent PMUs to capture performance events corresponding
+to 8 channels of DDR4 Memory Controller. Each PMU supports upto 4 counters.
+
+L3C: There are 16 independent PMUs to capture events corresponding to 16 tiles
+of L3 cache. Each PMU supports up to 4 counters.
+
+PMU UNCORE (perf) driver
+-----------------------
+
+The thunderx2-pmu driver registers several perf PMUs for DMC and L3C devices.
+Each of the PMU provides description of its available events
+and configuration options in sysfs.
+	see /sys/devices/uncore_<l3c_X/dmc_S_X/.
+
+S is socket id and X represents channel number.
+There are 8 supported channels for DMC and 16 for L3C.
+Each channel supports up to 4 counters, which can be measured
+simultaneously without event muxing for each channel.
+
+The "format" directory describes format of the config (event ID).
+The "events" directory provides configuration templates for all
+supported event types that can be used with perf tool.
+
+For example, "uncore_dmc_0_0/cnt_cycles/" is an
+equivalent of "uncore_dmc_0_0/config=0x1/".
+
+
+Each perf driver also provides a "cpumask" sysfs attribute, which contains a
+single CPU ID of the processor which will be used to handle all the PMU events.
+It will be the first online CPU of the node of PMU device.
+
+Example for perf tool use:
+
+perf stat -a -e \
+	uncore_dmc_0_0/cnt_cycles/,\
+	uncore_dmc_0_1/cnt_cycles/,\
+	uncore_dmc_0_2/cnt_cycles/,\
+	uncore_dmc_0_3/cnt_cycles/,\
+	uncore_dmc_0_4/cnt_cycles/,\
+	uncore_dmc_0_5/cnt_cycles/,\
+	uncore_dmc_0_6/cnt_cycles/,\
+	uncore_dmc_0_7/cnt_cycles/ \
+	sleep 1
+
+perf stat -a -e \
+	uncore_dmc_0_0/cnt_cycles/,\
+	uncore_dmc_0_0/data_txfered/,\
+	uncore_dmc_0_0/txn_cycles/,\
+	uncore_dmc_0_0/cancelled_read_txn/ \
+	sleep 1
+
+The driver does not support sampling, therefore "perf record" will
+not work. Per-task (without "-a") perf sessions are not supported.
-- 
1.8.1.4

[RESEND PATCH 2/2] perf: ThunderX2: Add Cavium Thunderx2 SoC UNCORE PMU driver

[Ganapatrao Kulkarni]

This patch adds a perf driver for the PMU UNCORE devices DDR4 Memory
Controller(DMC) and Level 3 Cache(L3C).

Signed-off-by: Ganapatrao Kulkarni <ganapatrao.kulkarni@cavium.com>
---
 drivers/perf/Kconfig         |   9 +
 drivers/perf/Makefile        |   1 +
 drivers/perf/thunderx2_pmu.c | 965 +++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 975 insertions(+)
 create mode 100644 drivers/perf/thunderx2_pmu.c

diff --git a/drivers/perf/Kconfig b/drivers/perf/Kconfig
index 9365190..ddc194b 100644
--- a/drivers/perf/Kconfig
+++ b/drivers/perf/Kconfig
@@ -21,6 +21,15 @@ config QCOM_L2_PMU
 	  Adds the L2 cache PMU into the perf events subsystem for
 	  monitoring L2 cache events.
 
+config THUNDERX2_PMU
+        depends on PERF_EVENTS && ACPI
+        bool "Cavium ThunderX2 SoC PMU UNCORE"
+        default y if (ARCH_VULCAN || ARCH_THUNDER2)
+	help
+	  Provides support for ThunderX2 UNCORE events.
+	  The SoC has PMU support in its L3 cache controller (L3C) and
+	  in the DDR4 Memory Controller (DMC).
+
 config XGENE_PMU
         depends on PERF_EVENTS && ARCH_XGENE
         bool "APM X-Gene SoC PMU"
diff --git a/drivers/perf/Makefile b/drivers/perf/Makefile
index ef24833..ffd7e93 100644
--- a/drivers/perf/Makefile
+++ b/drivers/perf/Makefile
@@ -1,3 +1,4 @@
 obj-$(CONFIG_ARM_PMU) += arm_pmu.o
 obj-$(CONFIG_QCOM_L2_PMU)	+= qcom_l2_pmu.o
+obj-$(CONFIG_THUNDERX2_PMU) += thunderx2_pmu.o
 obj-$(CONFIG_XGENE_PMU) += xgene_pmu.o
diff --git a/drivers/perf/thunderx2_pmu.c b/drivers/perf/thunderx2_pmu.c
new file mode 100644
index 0000000..4510a4c
--- /dev/null
+++ b/drivers/perf/thunderx2_pmu.c
@@ -0,0 +1,965 @@
+/*
+ * CAVIUM THUNDERX2 SoC PMU UNCORE
+ *
+ * Copyright (C) 2017 Cavium Inc.
+ * Author: Ganapatrao Kulkarni <gkulkarni@cavium.com>
+ *
+ * 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/arm-smccc.h>
+#include <linux/perf_event.h>
+#include <linux/platform_device.h>
+
+#define UNCORE_MAX_COUNTERS		4
+#define UNCORE_L3_MAX_TILES		16
+#define UNCORE_DMC_MAX_CHANNELS		8
+
+#define UNCORE_HRTIMER_INTERVAL		(2 * NSEC_PER_SEC)
+#define GET_EVENTID(ev)			((ev->hw.config) & 0x1ff)
+#define GET_COUNTERID(ev)		((ev->hw.idx) & 0xf)
+#define GET_CHANNELID(pmu_uncore)	(pmu_uncore->channel)
+
+#define DMC_COUNTER_CTL			0x234
+#define DMC_COUNTER_DATA		0x240
+#define L3C_COUNTER_CTL			0xA8
+#define L3C_COUNTER_DATA		0xAC
+
+#define SELECT_CHANNEL			0xC
+#define THUNDERX2_SMC_RD_MMIO		0xC2000001
+#define THUNDERX2_SMC_WR_MMIO		0xC2000002
+
+enum thunderx2_uncore_l3_events {
+	L3_EVENT_NBU_CANCEL = 1,
+	L3_EVENT_DIB_RETRY,
+	L3_EVENT_DOB_RETRY,
+	L3_EVENT_DIB_CREDIT_RETRY,
+	L3_EVENT_DOB_CREDIT_RETRY,
+	L3_EVENT_FORCE_RETRY,
+	L3_EVENT_IDX_CONFLICT_RETRY,
+	L3_EVENT_EVICT_CONFLICT_RETRY,
+	L3_EVENT_BANK_CONFLICT_RETRY,
+	L3_EVENT_FILL_ENTRY_RETRY,
+	L3_EVENT_EVICT_NOT_READY_RETRY,
+	L3_EVENT_L3_RETRY,
+	L3_EVENT_READ_REQ,
+	L3_EVENT_WRITE_BACK_REQ,
+	L3_EVENT_INVALIDATE_NWRITE_REQ,
+	L3_EVENT_INV_REQ,
+	L3_EVENT_SELF_REQ,
+	L3_EVENT_REQ,
+	L3_EVENT_EVICT_REQ,
+	L3_EVENT_INVALIDATE_NWRITE_HIT,
+	L3_EVENT_INVALIDATE_HIT,
+	L3_EVENT_SELF_HIT,
+	L3_EVENT_READ_HIT,
+	L3_EVENT_MAX,
+};
+
+enum thunderx2_uncore_dmc_events {
+	DMC_EVENT_COUNT_CYCLES = 1,
+	DMC_EVENT_RES2,
+	DMC_EVENT_RES3,
+	DMC_EVENT_RES4,
+	DMC_EVENT_RES5,
+	DMC_EVENT_RES6,
+	DMC_EVENT_RES7,
+	DMC_EVENT_RES8,
+	DMC_EVENT_READ_64B,
+	DMC_EVENT_READ_LESS_THAN_64B,
+	DMC_EVENT_WRITE,
+	DMC_EVENT_TXN_CYCLES,
+	DMC_EVENT_DATA_TXFERED,
+	DMC_EVENT_CANCELLED_READ_TXN,
+	DMC_EVENT_READ_TXN_CONSUMED,
+	DMC_EVENT_MAX,
+};
+
+enum thunderx2_uncore_type {
+	PMU_TYPE_INVALID,
+	PMU_TYPE_L3C,
+	PMU_TYPE_DMC,
+};
+
+struct active_timer {
+	struct perf_event *event;
+	struct hrtimer hrtimer;
+};
+
+/*
+ * pmu on each socket has 2 uncore devices(dmc and l3),
+ * each uncore device has up to 16 channels, each channel can sample
+ * events independently with counters up to 4.
+ *
+ * struct thunderx2_pmu_uncore_channel created per channel.
+ * struct thunderx2_pmu_uncore_dev per uncore device.
+ * struct thunderx2_pmu created per socket.
+ */
+struct thunderx2_pmu_uncore_channel {
+	struct thunderx2_pmu_uncore_dev *uncore_dev;
+	struct pmu pmu;
+	int counter;
+	int channel;
+	DECLARE_BITMAP(counter_mask, UNCORE_MAX_COUNTERS);
+	struct active_timer *active_timers;
+	/* to sync counter alloc/release */
+	raw_spinlock_t lock;
+};
+
+struct thunderx2_pmu_uncore_dev {
+	char *name;
+	enum thunderx2_uncore_type type;
+	unsigned long base;
+	struct thunderx2_pmu *thunderx2_pmu;
+	int node;
+	struct cpumask cpu_mask;
+	u32    max_counters;
+	u32    max_channels;
+	u32    max_events;
+	u64 hrtimer_interval;
+	/* this lock synchronizes across channels */
+	raw_spinlock_t lock;
+	const struct attribute_group **attr_groups;
+	void	(*init_cntr_base)(struct perf_event *event,
+			struct thunderx2_pmu_uncore_dev *uncore_dev);
+	void	(*select_channel)(struct perf_event *event);
+	void	(*stop_event)(struct perf_event *event);
+	void	(*start_event)(struct perf_event *event, int flags);
+};
+
+struct thunderx2_pmu {
+	struct device *dev;
+	unsigned long base_pa;
+};
+
+static inline struct thunderx2_pmu_uncore_channel *
+pmu_to_thunderx2_pmu_uncore(struct pmu *pmu)
+{
+	return container_of(pmu, struct thunderx2_pmu_uncore_channel, pmu);
+}
+
+/*
+ * sysfs format attributes
+ */
+static ssize_t thunderx2_pmu_format_show(struct device *dev,
+				     struct device_attribute *attr, char *buf)
+{
+	struct dev_ext_attribute *eattr;
+
+	eattr = container_of(attr, struct dev_ext_attribute, attr);
+	return sprintf(buf, "%s\n", (char *) eattr->var);
+}
+
+#define FORMAT_ATTR(_name, _config) \
+	(&((struct dev_ext_attribute[]) { \
+	   { \
+	   .attr = __ATTR(_name, 0444, thunderx2_pmu_format_show, NULL), \
+	   .var = (void *) _config, \
+	   } \
+	})[0].attr.attr)
+
+static struct attribute *l3c_pmu_format_attrs[] = {
+	FORMAT_ATTR(event,	"config:0-4"),
+	NULL,
+};
+
+static struct attribute *dmc_pmu_format_attrs[] = {
+	FORMAT_ATTR(event,	"config:0-4"),
+	NULL,
+};
+
+static const struct attribute_group l3c_pmu_format_attr_group = {
+	.name = "format",
+	.attrs = l3c_pmu_format_attrs,
+};
+
+static const struct attribute_group dmc_pmu_format_attr_group = {
+	.name = "format",
+	.attrs = dmc_pmu_format_attrs,
+};
+
+/*
+ * sysfs event attributes
+ */
+static ssize_t thunderx2_pmu_event_show(struct device *dev,
+				    struct device_attribute *attr, char *buf)
+{
+	struct dev_ext_attribute *eattr;
+
+	eattr = container_of(attr, struct dev_ext_attribute, attr);
+	return sprintf(buf, "config=0x%lx\n", (unsigned long) eattr->var);
+}
+
+#define EVENT_ATTR(_name, _config) \
+	(&((struct dev_ext_attribute[]) { \
+	   { \
+	   .attr = __ATTR(_name, 0444, thunderx2_pmu_event_show, NULL), \
+	   .var = (void *) _config, \
+	   } \
+	 })[0].attr.attr)
+
+static struct attribute *l3c_pmu_events_attrs[] = {
+	EVENT_ATTR(nbu_cancel,			L3_EVENT_NBU_CANCEL),
+	EVENT_ATTR(dib_retry,			L3_EVENT_DIB_RETRY),
+	EVENT_ATTR(dob_retry,			L3_EVENT_DOB_RETRY),
+	EVENT_ATTR(dib_credit_retry,		L3_EVENT_DIB_CREDIT_RETRY),
+	EVENT_ATTR(dob_credit_retry,		L3_EVENT_DOB_CREDIT_RETRY),
+	EVENT_ATTR(force_retry,			L3_EVENT_FORCE_RETRY),
+	EVENT_ATTR(idx_conflict_retry,		L3_EVENT_IDX_CONFLICT_RETRY),
+	EVENT_ATTR(evict_conflict_retry,	L3_EVENT_EVICT_CONFLICT_RETRY),
+	EVENT_ATTR(bank_conflict_retry,		L3_EVENT_BANK_CONFLICT_RETRY),
+	EVENT_ATTR(fill_entry_retry,		L3_EVENT_FILL_ENTRY_RETRY),
+	EVENT_ATTR(evict_not_ready_retry,	L3_EVENT_EVICT_NOT_READY_RETRY),
+	EVENT_ATTR(l3_retry,			L3_EVENT_L3_RETRY),
+	EVENT_ATTR(read_requests,		L3_EVENT_READ_REQ),
+	EVENT_ATTR(write_back_requests,		L3_EVENT_WRITE_BACK_REQ),
+	EVENT_ATTR(inv_nwrite_requests,		L3_EVENT_INVALIDATE_NWRITE_REQ),
+	EVENT_ATTR(inv_requests,		L3_EVENT_INV_REQ),
+	EVENT_ATTR(self_requests,		L3_EVENT_SELF_REQ),
+	EVENT_ATTR(requests,			L3_EVENT_REQ),
+	EVENT_ATTR(evict_requests,		L3_EVENT_EVICT_REQ),
+	EVENT_ATTR(inv_nwrite_hit,		L3_EVENT_INVALIDATE_NWRITE_HIT),
+	EVENT_ATTR(inv_hit,			L3_EVENT_INVALIDATE_HIT),
+	EVENT_ATTR(self_hit,			L3_EVENT_SELF_HIT),
+	EVENT_ATTR(read_hit,			L3_EVENT_READ_HIT),
+	NULL,
+};
+
+static struct attribute *dmc_pmu_events_attrs[] = {
+	EVENT_ATTR(cnt_cycles,			DMC_EVENT_COUNT_CYCLES),
+	EVENT_ATTR(read_64b_txns,		DMC_EVENT_READ_64B),
+	EVENT_ATTR(read_less_than_64b_txns,	DMC_EVENT_READ_LESS_THAN_64B),
+	EVENT_ATTR(write_txns,			DMC_EVENT_WRITE),
+	EVENT_ATTR(txn_cycles,			DMC_EVENT_TXN_CYCLES),
+	EVENT_ATTR(data_txfered,		DMC_EVENT_DATA_TXFERED),
+	EVENT_ATTR(cancelled_read_txn,		DMC_EVENT_CANCELLED_READ_TXN),
+	EVENT_ATTR(read_txn_consumed,		DMC_EVENT_READ_TXN_CONSUMED),
+	NULL,
+};
+
+static const struct attribute_group l3c_pmu_events_attr_group = {
+	.name = "events",
+	.attrs = l3c_pmu_events_attrs,
+};
+
+static const struct attribute_group dmc_pmu_events_attr_group = {
+	.name = "events",
+	.attrs = dmc_pmu_events_attrs,
+};
+
+/*
+ * sysfs cpumask attributes
+ */
+static ssize_t thunderx2_pmu_cpumask_show(struct device *dev,
+				struct device_attribute *attr, char *buf)
+{
+	struct thunderx2_pmu_uncore_channel *pmu_uncore =
+		pmu_to_thunderx2_pmu_uncore(dev_get_drvdata(dev));
+	return cpumap_print_to_pagebuf(true, buf,
+			&pmu_uncore->uncore_dev->cpu_mask);
+}
+
+static DEVICE_ATTR(cpumask, 0444, thunderx2_pmu_cpumask_show, NULL);
+
+static struct attribute *thunderx2_pmu_cpumask_attrs[] = {
+	&dev_attr_cpumask.attr,
+	NULL,
+};
+
+static const struct attribute_group pmu_cpumask_attr_group = {
+	.attrs = thunderx2_pmu_cpumask_attrs,
+};
+
+/*
+ * Per PMU device attribute groups
+ */
+static const struct attribute_group *l3c_pmu_attr_groups[] = {
+	&l3c_pmu_format_attr_group,
+	&pmu_cpumask_attr_group,
+	&l3c_pmu_events_attr_group,
+	NULL
+};
+
+static const struct attribute_group *dmc_pmu_attr_groups[] = {
+	&dmc_pmu_format_attr_group,
+	&pmu_cpumask_attr_group,
+	&dmc_pmu_events_attr_group,
+	NULL
+};
+
+static inline struct active_timer *get_active_timer(struct hrtimer *hrt)
+{
+	return container_of(hrt, struct active_timer, hrtimer);
+}
+
+static inline u32 reg_readl(unsigned long addr)
+{
+	return readl((void __iomem *)addr);
+}
+
+static inline void reg_writel(u32 val, unsigned long addr)
+{
+	writel(val, (void __iomem *)addr);
+}
+
+static int alloc_counter(struct thunderx2_pmu_uncore_channel *pmu_uncore)
+{
+	int counter;
+
+	raw_spin_lock(&pmu_uncore->lock);
+	counter = find_first_zero_bit(pmu_uncore->counter_mask,
+				pmu_uncore->uncore_dev->max_counters);
+	if (counter == pmu_uncore->uncore_dev->max_counters) {
+		raw_spin_unlock(&pmu_uncore->lock);
+		return -ENOSPC;
+	}
+	set_bit(counter, pmu_uncore->counter_mask);
+	raw_spin_unlock(&pmu_uncore->lock);
+	return counter;
+}
+
+static void free_counter(struct thunderx2_pmu_uncore_channel *pmu_uncore,
+					int counter)
+{
+	raw_spin_lock(&pmu_uncore->lock);
+	clear_bit(counter, pmu_uncore->counter_mask);
+	raw_spin_unlock(&pmu_uncore->lock);
+}
+
+static void secure_write_reg(uint32_t value, uint64_t pa)
+{
+	struct arm_smccc_res res;
+
+	arm_smccc_smc(THUNDERX2_SMC_WR_MMIO, pa, 2, value, 0x0, 0, 0, 0, &res);
+}
+
+static uint32_t secure_read_reg(uint64_t pa)
+{
+	struct arm_smccc_res res;
+
+	arm_smccc_smc(THUNDERX2_SMC_RD_MMIO, pa, 2, 0, 0, 0, 0, 0, &res);
+	return res.a0;
+}
+
+/*
+ * DMC and L3 counter interface is muxed across all channels.
+ * hence we need to select the channel before accessing counter
+ * data/control registers.
+ *
+ *  L3 tile/DMC channel selection is through secure register
+ */
+static void uncore_select_channel_l3c(struct perf_event *event)
+{
+	u32 val;
+	struct thunderx2_pmu_uncore_channel *pmu_uncore;
+	unsigned long pa;
+
+	pmu_uncore = pmu_to_thunderx2_pmu_uncore(event->pmu);
+	pa = pmu_uncore->uncore_dev->thunderx2_pmu->base_pa + SELECT_CHANNEL;
+
+	val = secure_read_reg(pa);
+	/* bits [03:00] selects L3C tile */
+	val &= ~(0xf);
+	val |= GET_CHANNELID(pmu_uncore);
+	secure_write_reg(val, pa);
+}
+
+static void uncore_select_channel_dmc(struct perf_event *event)
+{
+	u32 val;
+	struct thunderx2_pmu_uncore_channel *pmu_uncore;
+	unsigned long pa;
+
+	pmu_uncore = pmu_to_thunderx2_pmu_uncore(event->pmu);
+	pa = pmu_uncore->uncore_dev->thunderx2_pmu->base_pa + SELECT_CHANNEL;
+
+	val = secure_read_reg(pa);
+	/* bits [06:04] selects DMC channel */
+	val &= ~(0x7 << 4);
+	val |= (GET_CHANNELID(pmu_uncore) << 4);
+	secure_write_reg(val, pa);
+}
+
+static void uncore_start_event_l3c(struct perf_event *event, int flags)
+{
+	u32 val;
+	struct hw_perf_event *hwc = &event->hw;
+
+	/* event id encoded in bits [07:03] */
+	val = GET_EVENTID(event) << 3;
+	reg_writel(val, hwc->config_base);
+
+	if (flags & PERF_EF_RELOAD) {
+		u64 prev_raw_count =
+			local64_read(&event->hw.prev_count);
+		reg_writel(prev_raw_count, hwc->event_base);
+	}
+	local64_set(&event->hw.prev_count,
+			reg_readl(hwc->event_base));
+}
+
+static void uncore_start_event_dmc(struct perf_event *event, int flags)
+{
+	u32 val, event_shift = 8;
+	struct hw_perf_event *hwc = &event->hw;
+
+	/* enable and start counters and read current value in prev_count */
+	val = reg_readl(hwc->config_base);
+
+	/* 8 bits for each counter,
+	 * bits [05:01] of a counter to set event type.
+	 */
+	reg_writel((val & ~(0x1f << (((GET_COUNTERID(event)) *
+		event_shift) + 1))) |
+		(GET_EVENTID(event) <<
+		 (((GET_COUNTERID(event)) * event_shift) + 1)),
+		hwc->config_base);
+
+	if (flags & PERF_EF_RELOAD) {
+		u64 prev_raw_count =
+			local64_read(&event->hw.prev_count);
+		reg_writel(prev_raw_count, hwc->event_base);
+	}
+	local64_set(&event->hw.prev_count,
+			reg_readl(hwc->event_base));
+}
+
+static void uncore_stop_event_l3c(struct perf_event *event)
+{
+	reg_writel(0, event->hw.config_base);
+}
+
+static void uncore_stop_event_dmc(struct perf_event *event)
+{
+	u32 val, event_shift = 8;
+	struct hw_perf_event *hwc = &event->hw;
+
+	val = reg_readl(hwc->config_base);
+	reg_writel((val & ~(0xff << ((GET_COUNTERID(event)) * event_shift))),
+			hwc->config_base);
+}
+
+static void init_cntr_base_l3c(struct perf_event *event,
+		struct thunderx2_pmu_uncore_dev *uncore_dev) {
+
+	struct hw_perf_event *hwc = &event->hw;
+
+	/* counter ctrl/data reg offset at 8 */
+	hwc->config_base = uncore_dev->base
+		+ L3C_COUNTER_CTL + (8 * GET_COUNTERID(event));
+	hwc->event_base =  uncore_dev->base
+		+ L3C_COUNTER_DATA + (8 * GET_COUNTERID(event));
+}
+
+static void init_cntr_base_dmc(struct perf_event *event,
+		struct thunderx2_pmu_uncore_dev *uncore_dev) {
+
+	struct hw_perf_event *hwc = &event->hw;
+
+	hwc->config_base = uncore_dev->base
+		+ DMC_COUNTER_CTL;
+	/* counter data reg offset at 0xc */
+	hwc->event_base =  uncore_dev->base
+		+ DMC_COUNTER_DATA + (0xc * GET_COUNTERID(event));
+}
+
+static void thunderx2_uncore_update(struct perf_event *event)
+{
+	s64 prev, new = 0;
+	u64 delta;
+	struct hw_perf_event *hwc = &event->hw;
+	struct thunderx2_pmu_uncore_channel *pmu_uncore;
+	enum thunderx2_uncore_type type;
+
+	pmu_uncore = pmu_to_thunderx2_pmu_uncore(event->pmu);
+	type = pmu_uncore->uncore_dev->type;
+
+	if (pmu_uncore->uncore_dev->select_channel)
+		pmu_uncore->uncore_dev->select_channel(event);
+
+	new = reg_readl(hwc->event_base);
+	prev = local64_xchg(&hwc->prev_count, new);
+
+	/* handle rollover of counters */
+	if (new < prev)
+		delta = (((1UL << 32) - prev) + new);
+	else
+		delta = new - prev;
+
+	local64_add(delta, &event->count);
+}
+
+enum thunderx2_uncore_type get_uncore_device_type(struct acpi_device *adev)
+{
+	int i = 0;
+	struct acpi_uncore_device {
+		__u8 id[ACPI_ID_LEN];
+		enum thunderx2_uncore_type type;
+	} devices[] = {
+		{"CAV901D", PMU_TYPE_L3C},
+		{"CAV901F", PMU_TYPE_DMC},
+		{"", PMU_TYPE_INVALID},
+	};
+
+	while (devices[i].type != PMU_TYPE_INVALID) {
+		if (!strcmp(acpi_device_hid(adev), devices[i].id))
+			return devices[i].type;
+		i++;
+	}
+	return PMU_TYPE_INVALID;
+}
+
+static int thunderx2_uncore_event_init(struct perf_event *event)
+{
+	struct hw_perf_event *hwc = &event->hw;
+	struct thunderx2_pmu_uncore_channel *pmu_uncore;
+	struct perf_event *sibling;
+
+	/* Test the event attr type check for PMU enumeration */
+	if (event->attr.type != event->pmu->type)
+		return -ENOENT;
+
+	/*
+	 * SOC PMU counters are shared across all cores.
+	 * Therefore, it does not support per-process mode.
+	 * Also, it does not support event sampling mode.
+	 */
+	if (is_sampling_event(event) || event->attach_state & PERF_ATTACH_TASK)
+		return -EINVAL;
+
+	/* SOC counters do not have usr/os/guest/host bits */
+	if (event->attr.exclude_user || event->attr.exclude_kernel ||
+	    event->attr.exclude_host || event->attr.exclude_guest)
+		return -EINVAL;
+
+	if (event->cpu < 0)
+		return -EINVAL;
+
+	pmu_uncore = pmu_to_thunderx2_pmu_uncore(event->pmu);
+
+	if (!pmu_uncore)
+		return -ENODEV;
+
+	/* Pick one core from the node to use for cpumask attributes */
+	event->cpu = cpumask_first(
+			cpumask_of_node(pmu_uncore->uncore_dev->node));
+
+	if (event->cpu >= nr_cpu_ids)
+		return -EINVAL;
+
+	if (event->attr.config >= pmu_uncore->uncore_dev->max_events)
+		return -EINVAL;
+
+	/* store event id */
+	hwc->config = event->attr.config;
+
+	/*
+	 * We must NOT create groups containing mixed PMUs,
+	 * although software events are acceptable
+	 */
+	if (event->group_leader->pmu != event->pmu &&
+			!is_software_event(event->group_leader))
+		return -EINVAL;
+
+	list_for_each_entry(sibling, &event->group_leader->sibling_list,
+			group_entry)
+		if (sibling->pmu != event->pmu &&
+				!is_software_event(sibling))
+			return -EINVAL;
+
+	return 0;
+}
+
+static void thunderx2_uncore_start(struct perf_event *event, int flags)
+{
+	struct hw_perf_event *hwc = &event->hw;
+	struct thunderx2_pmu_uncore_channel *pmu_uncore;
+	struct thunderx2_pmu_uncore_dev *uncore_dev;
+	unsigned long irqflags;
+	struct active_timer *active_timer;
+
+	hwc->state = 0;
+	pmu_uncore = pmu_to_thunderx2_pmu_uncore(event->pmu);
+	uncore_dev = pmu_uncore->uncore_dev;
+
+	raw_spin_lock_irqsave(&uncore_dev->lock, irqflags);
+
+	if (uncore_dev->select_channel)
+		uncore_dev->select_channel(event);
+	uncore_dev->start_event(event, flags);
+	raw_spin_unlock_irqrestore(&uncore_dev->lock, irqflags);
+
+	perf_event_update_userpage(event);
+	active_timer = &pmu_uncore->active_timers[GET_COUNTERID(event)];
+	active_timer->event = event;
+
+	if (!hrtimer_active(&active_timer->hrtimer))
+		hrtimer_start(&active_timer->hrtimer,
+			ns_to_ktime(uncore_dev->hrtimer_interval),
+			HRTIMER_MODE_REL_PINNED);
+}
+
+static void thunderx2_uncore_stop(struct perf_event *event, int flags)
+{
+	struct hw_perf_event *hwc = &event->hw;
+	struct thunderx2_pmu_uncore_channel *pmu_uncore;
+	struct thunderx2_pmu_uncore_dev *uncore_dev;
+	unsigned long irqflags;
+
+	if (hwc->state & PERF_HES_UPTODATE)
+		return;
+
+	pmu_uncore = pmu_to_thunderx2_pmu_uncore(event->pmu);
+	uncore_dev = pmu_uncore->uncore_dev;
+
+	raw_spin_lock_irqsave(&uncore_dev->lock, irqflags);
+
+	if (uncore_dev->select_channel)
+		uncore_dev->select_channel(event);
+	uncore_dev->stop_event(event);
+
+	WARN_ON_ONCE(hwc->state & PERF_HES_STOPPED);
+	hwc->state |= PERF_HES_STOPPED;
+	if ((flags & PERF_EF_UPDATE) && !(hwc->state & PERF_HES_UPTODATE)) {
+		thunderx2_uncore_update(event);
+		hwc->state |= PERF_HES_UPTODATE;
+	}
+	raw_spin_unlock_irqrestore(&uncore_dev->lock, irqflags);
+}
+
+static int thunderx2_uncore_add(struct perf_event *event, int flags)
+{
+	struct hw_perf_event *hwc = &event->hw;
+	struct thunderx2_pmu_uncore_channel *pmu_uncore;
+	struct thunderx2_pmu_uncore_dev *uncore_dev;
+
+	pmu_uncore = pmu_to_thunderx2_pmu_uncore(event->pmu);
+	uncore_dev = pmu_uncore->uncore_dev;
+
+	/* Allocate a free counter */
+	hwc->idx  = alloc_counter(pmu_uncore);
+	if (hwc->idx < 0)
+		return -EAGAIN;
+
+	/* set counter control and data registers base address */
+	uncore_dev->init_cntr_base(event, uncore_dev);
+
+	hwc->state = PERF_HES_UPTODATE | PERF_HES_STOPPED;
+	if (flags & PERF_EF_START)
+		thunderx2_uncore_start(event, PERF_EF_RELOAD);
+
+	return 0;
+}
+
+static void thunderx2_uncore_del(struct perf_event *event, int flags)
+{
+	struct thunderx2_pmu_uncore_channel *pmu_uncore =
+			pmu_to_thunderx2_pmu_uncore(event->pmu);
+	struct hw_perf_event *hwc = &event->hw;
+
+	thunderx2_uncore_stop(event, PERF_EF_UPDATE);
+
+	hrtimer_cancel(
+		&pmu_uncore->active_timers[GET_COUNTERID(event)].hrtimer);
+	pmu_uncore->active_timers[GET_COUNTERID(event)].event = NULL;
+
+	/* clear the assigned counter */
+	free_counter(pmu_uncore, GET_COUNTERID(event));
+
+	perf_event_update_userpage(event);
+	hwc->idx = -1;
+}
+
+static void thunderx2_uncore_read(struct perf_event *event)
+{
+	unsigned long irqflags;
+	struct thunderx2_pmu_uncore_channel *pmu_uncore =
+			pmu_to_thunderx2_pmu_uncore(event->pmu);
+
+	raw_spin_lock_irqsave(&pmu_uncore->uncore_dev->lock, irqflags);
+	thunderx2_uncore_update(event);
+	raw_spin_unlock_irqrestore(&pmu_uncore->uncore_dev->lock, irqflags);
+}
+
+static enum hrtimer_restart thunderx2_uncore_hrtimer_callback(
+		struct hrtimer *hrt)
+{
+	struct thunderx2_pmu_uncore_channel *pmu_uncore;
+	struct perf_event *event;
+	unsigned long irqflags;
+	struct active_timer *active_timer;
+
+	active_timer = get_active_timer(hrt);
+	event = active_timer->event;
+
+	pmu_uncore = pmu_to_thunderx2_pmu_uncore(event->pmu);
+
+	raw_spin_lock_irqsave(&pmu_uncore->uncore_dev->lock, irqflags);
+	thunderx2_uncore_update(event);
+	raw_spin_unlock_irqrestore(&pmu_uncore->uncore_dev->lock, irqflags);
+
+	hrtimer_forward_now(hrt,
+			ns_to_ktime(
+				pmu_uncore->uncore_dev->hrtimer_interval));
+	return HRTIMER_RESTART;
+}
+
+static int thunderx2_pmu_uncore_register(
+		struct thunderx2_pmu_uncore_channel *pmu_uncore)
+{
+	struct device *dev = pmu_uncore->uncore_dev->thunderx2_pmu->dev;
+	char *name = pmu_uncore->uncore_dev->name;
+	int channel = pmu_uncore->channel;
+
+	/* Perf event registration */
+	pmu_uncore->pmu = (struct pmu) {
+		.attr_groups	= pmu_uncore->uncore_dev->attr_groups,
+		.task_ctx_nr	= perf_invalid_context,
+		.event_init	= thunderx2_uncore_event_init,
+		.add		= thunderx2_uncore_add,
+		.del		= thunderx2_uncore_del,
+		.start		= thunderx2_uncore_start,
+		.stop		= thunderx2_uncore_stop,
+		.read		= thunderx2_uncore_read,
+	};
+
+	pmu_uncore->pmu.name = devm_kasprintf(dev, GFP_KERNEL,
+			"%s_%d", name, channel);
+
+	return perf_pmu_register(&pmu_uncore->pmu, pmu_uncore->pmu.name, -1);
+}
+
+static int thunderx2_pmu_uncore_add(struct thunderx2_pmu *thunderx2_pmu,
+		struct thunderx2_pmu_uncore_dev *uncore_dev,
+		int channel)
+{
+	struct device *dev = thunderx2_pmu->dev;
+	struct thunderx2_pmu_uncore_channel *pmu_uncore;
+	int ret;
+	int counter;
+
+	pmu_uncore = devm_kzalloc(dev, sizeof(*pmu_uncore), GFP_KERNEL);
+	if (!pmu_uncore)
+		return -ENOMEM;
+
+	pmu_uncore->uncore_dev = uncore_dev;
+	pmu_uncore->channel = channel;
+
+	/* we can run up to (max_counters * max_channels) events simultaneously.
+	 * allocate hrtimers per channel.
+	 */
+	pmu_uncore->active_timers = devm_kzalloc(dev,
+			sizeof(struct active_timer) * uncore_dev->max_counters,
+			GFP_KERNEL);
+
+	for (counter = 0; counter < uncore_dev->max_counters; counter++) {
+		hrtimer_init(&pmu_uncore->active_timers[counter].hrtimer,
+				CLOCK_MONOTONIC,
+				HRTIMER_MODE_REL);
+		pmu_uncore->active_timers[counter].hrtimer.function =
+				thunderx2_uncore_hrtimer_callback;
+	}
+
+	ret = thunderx2_pmu_uncore_register(pmu_uncore);
+	if (ret) {
+		dev_err(dev, "%s PMU: Failed to init perf driver\n",
+				uncore_dev->name);
+		return -ENODEV;
+	}
+
+	dev_dbg(dev, "%s PMU UNCORE registered\n", pmu_uncore->pmu.name);
+	return ret;
+}
+
+static struct thunderx2_pmu_uncore_dev *init_pmu_uncore_dev(
+		struct thunderx2_pmu *thunderx2_pmu,
+		acpi_handle handle, struct acpi_device *adev, u32 type)
+{
+	struct device *dev = thunderx2_pmu->dev;
+	struct thunderx2_pmu_uncore_dev *uncore_dev;
+	unsigned long base;
+	struct resource res;
+	struct resource_entry *rentry;
+	struct list_head list;
+	int ret;
+
+	INIT_LIST_HEAD(&list);
+	ret = acpi_dev_get_resources(adev, &list, NULL, NULL);
+	if (ret <= 0) {
+		dev_err(dev, "failed to parse _CRS method, error %d\n", ret);
+		return NULL;
+	}
+
+	list_for_each_entry(rentry, &list, node) {
+		if (resource_type(rentry->res) == IORESOURCE_MEM) {
+			res = *rentry->res;
+			break;
+		}
+	}
+
+	if (!rentry->res)
+		return NULL;
+
+	acpi_dev_free_resource_list(&list);
+
+	base = (unsigned long)devm_ioremap_resource(dev, &res);
+	if (IS_ERR((void *)base)) {
+		dev_err(dev, "PMU type %d: Fail to map resource\n", type);
+		return NULL;
+	}
+
+	uncore_dev = devm_kzalloc(dev, sizeof(*uncore_dev), GFP_KERNEL);
+	if (!uncore_dev)
+		return NULL;
+
+	uncore_dev->thunderx2_pmu = thunderx2_pmu;
+	uncore_dev->type = type;
+	uncore_dev->base = base;
+	uncore_dev->node = dev_to_node(dev);
+
+	/* Pick one core from the node to use for cpumask attributes */
+	cpumask_set_cpu(cpumask_first(cpumask_of_node(uncore_dev->node)),
+			&uncore_dev->cpu_mask);
+	raw_spin_lock_init(&uncore_dev->lock);
+
+	switch (uncore_dev->type) {
+	case PMU_TYPE_L3C:
+		uncore_dev->max_counters = UNCORE_MAX_COUNTERS;
+		uncore_dev->max_channels = UNCORE_L3_MAX_TILES;
+		uncore_dev->max_events = L3_EVENT_MAX;
+		uncore_dev->hrtimer_interval = UNCORE_HRTIMER_INTERVAL;
+		uncore_dev->attr_groups = l3c_pmu_attr_groups;
+		uncore_dev->name = devm_kasprintf(dev, GFP_KERNEL,
+				"uncore_l3c_%d", uncore_dev->node);
+		uncore_dev->init_cntr_base = init_cntr_base_l3c;
+		uncore_dev->select_channel = uncore_select_channel_l3c;
+		uncore_dev->start_event = uncore_start_event_l3c;
+		uncore_dev->stop_event = uncore_stop_event_l3c;
+		break;
+	case PMU_TYPE_DMC:
+		uncore_dev->max_counters = UNCORE_MAX_COUNTERS;
+		uncore_dev->max_channels = UNCORE_DMC_MAX_CHANNELS;
+		uncore_dev->max_events = DMC_EVENT_MAX;
+		uncore_dev->hrtimer_interval = UNCORE_HRTIMER_INTERVAL;
+		uncore_dev->attr_groups = dmc_pmu_attr_groups;
+		uncore_dev->name = devm_kasprintf(dev, GFP_KERNEL,
+				"uncore_dmc_%d", uncore_dev->node);
+		uncore_dev->init_cntr_base = init_cntr_base_dmc;
+		uncore_dev->select_channel = uncore_select_channel_dmc;
+		uncore_dev->start_event = uncore_start_event_dmc;
+		uncore_dev->stop_event = uncore_stop_event_dmc;
+		break;
+	case PMU_TYPE_INVALID:
+		uncore_dev = NULL;
+		break;
+	}
+
+	return uncore_dev;
+}
+
+static acpi_status thunderx2_pmu_uncore_dev_add(acpi_handle handle, u32 level,
+				    void *data, void **return_value)
+{
+	struct thunderx2_pmu *thunderx2_pmu = data;
+	struct thunderx2_pmu_uncore_dev *uncore_dev;
+	struct acpi_device *adev;
+	enum thunderx2_uncore_type type;
+	int channel;
+
+	if (acpi_bus_get_device(handle, &adev))
+		return AE_OK;
+	if (acpi_bus_get_status(adev) || !adev->status.present)
+		return AE_OK;
+
+	type = get_uncore_device_type(adev);
+	if (type == PMU_TYPE_INVALID)
+		return AE_OK;
+
+	uncore_dev = init_pmu_uncore_dev(thunderx2_pmu, handle, adev, type);
+
+	if (!uncore_dev)
+		return AE_ERROR;
+
+	for (channel = 0; channel < uncore_dev->max_channels; channel++) {
+		if (thunderx2_pmu_uncore_add(thunderx2_pmu, uncore_dev,
+					channel)) {
+			/* Can't add the PMU device, abort */
+			return AE_ERROR;
+		}
+	}
+	return AE_OK;
+}
+
+static int thunderx2_uncore_dev_probe(struct thunderx2_pmu *thunderx2_pmu,
+				   struct platform_device *pdev)
+{
+	struct device *dev = thunderx2_pmu->dev;
+	acpi_handle handle;
+	acpi_status status;
+
+	if (!has_acpi_companion(&pdev->dev))
+		return -ENODEV;
+
+	handle = ACPI_HANDLE(dev);
+	if (!handle)
+		return -EINVAL;
+
+	status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 1,
+				     thunderx2_pmu_uncore_dev_add,
+				     NULL, thunderx2_pmu, NULL);
+	if (ACPI_FAILURE(status)) {
+		dev_err(dev, "failed to probe PMU devices\n");
+		return_ACPI_STATUS(status);
+	}
+
+	dev_info(dev, "node%d: pmu uncore registered\n", dev_to_node(dev));
+	return 0;
+}
+
+static const struct acpi_device_id thunderx2_uncore_acpi_match[] = {
+	{"CAV901C", 0},
+	{},
+};
+MODULE_DEVICE_TABLE(acpi, thunderx2_uncore_acpi_match);
+
+static int thunderx2_uncore_probe(struct platform_device *pdev)
+{
+	struct thunderx2_pmu *thunderx2_pmu;
+	struct resource *res;
+	struct device *dev = &pdev->dev;
+
+	set_dev_node(dev, acpi_get_node(ACPI_HANDLE(dev)));
+	thunderx2_pmu = devm_kzalloc(dev, sizeof(*thunderx2_pmu), GFP_KERNEL);
+	if (!thunderx2_pmu)
+		return -ENOMEM;
+
+	thunderx2_pmu->dev = dev;
+	platform_set_drvdata(pdev, thunderx2_pmu);
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	thunderx2_pmu->base_pa = res->start;
+
+	/* Walk through the tree for all PMU UNCORE devices */
+	return thunderx2_uncore_dev_probe(thunderx2_pmu, pdev);
+}
+
+static struct platform_driver thunderx2_uncore_driver = {
+	.probe = thunderx2_uncore_probe,
+	.driver = {
+		.name		= "thunderx2-uncore-pmu",
+		.acpi_match_table = ACPI_PTR(thunderx2_uncore_acpi_match),
+	},
+};
+
+builtin_platform_driver(thunderx2_uncore_driver);
-- 
1.8.1.4

Re: [RESEND PATCH 0/2] Add ThunderX2 SoC Performance Monitoring Unit driver

[Ganapatrao Kulkarni]

Hi Mark, Will,

can you please review this patchset?

On Wed, May 17, 2017 at 12:30 PM, Ganapatrao Kulkarni
<ganapatrao.kulkarni@cavium.com> wrote:
> This adds PMU driver for Cavium's ThunderX2 SoC UNCORE devices.
> The SoC has PMU support in its L3 cache controller (L3C) and in the
> DDR4 Memory Controller (DMC).
>
> Ganapatrao Kulkarni (2):
>   perf: uncore: Adding documentation for ThunderX2 pmu uncore driver
>   perf: ThunderX2: Add Cavium Thunderx2 SoC UNCORE PMU driver
>
>  Documentation/perf/thunderx2-pmu.txt |  60 +++
>  drivers/perf/Kconfig                 |   9 +
>  drivers/perf/Makefile                |   1 +
>  drivers/perf/thunderx2_pmu.c         | 965 +++++++++++++++++++++++++++++++++++
>  4 files changed, 1035 insertions(+)
>  create mode 100644 Documentation/perf/thunderx2-pmu.txt
>  create mode 100644 drivers/perf/thunderx2_pmu.c
>
> --
> 1.8.1.4
>

thanks
Ganapat