[PATCH v6 0/2] Add CCPI2 PMU support

[PATCH v6 0/2] Add CCPI2 PMU support

[Ganapatrao Prabhakerrao Kulkarni]

Add Cavium Coherent Processor Interconnect (CCPI2) PMU
support in ThunderX2 Uncore driver.

v6:
	Rebased to 5.4-rc1

v5:
	Fixed minor bug of v4 (timer callback fuction
	was getting initialized to NULL for all PMUs).

v4:
	Update with review comments [2].
	Changed Counter read to 2 word read since single dword read is misbhehaving(hw issue).

[2] https://lkml.org/lkml/2019/7/23/231

v3: Rebased to 5.3-rc1

v2: Updated with review comments [1]

[1] https://lkml.org/lkml/2019/6/14/965

v1: initial patch


Ganapatrao Prabhakerrao Kulkarni (2):
  Documentation: perf: Update documentation for ThunderX2 PMU uncore
    driver
  drivers/perf: Add CCPI2 PMU support in ThunderX2 UNCORE driver.

 .../admin-guide/perf/thunderx2-pmu.rst        |  20 +-
 drivers/perf/thunderx2_pmu.c                  | 267 +++++++++++++++---
 2 files changed, 245 insertions(+), 42 deletions(-)

-- 
2.17.1

[PATCH v6 1/2] Documentation: perf: Update documentation for ThunderX2 PMU uncore driver

[Ganapatrao Prabhakerrao Kulkarni]

Add documentation for Cavium Coherent Processor Interconnect (CCPI2) PMU.

Signed-off-by: Ganapatrao Prabhakerrao Kulkarni <gkulkarni@marvell.com>
---
 .../admin-guide/perf/thunderx2-pmu.rst        | 20 ++++++++++---------
 1 file changed, 11 insertions(+), 9 deletions(-)

diff --git a/Documentation/admin-guide/perf/thunderx2-pmu.rst b/Documentation/admin-guide/perf/thunderx2-pmu.rst
index 08e33675853a..01f158238ae1 100644
--- a/Documentation/admin-guide/perf/thunderx2-pmu.rst
+++ b/Documentation/admin-guide/perf/thunderx2-pmu.rst
@@ -3,24 +3,26 @@ Cavium ThunderX2 SoC Performance Monitoring Unit (PMU UNCORE)
 =============================================================
 
 The ThunderX2 SoC PMU consists of independent, system-wide, per-socket
-PMUs such as the Level 3 Cache (L3C) and DDR4 Memory Controller (DMC).
+PMUs such as the Level 3 Cache (L3C), DDR4 Memory Controller (DMC) and
+Cavium Coherent Processor Interconnect (CCPI2).
 
 The DMC has 8 interleaved channels and the L3C has 16 interleaved tiles.
 Events are counted for the default channel (i.e. channel 0) and prorated
 to the total number of channels/tiles.
 
-The DMC and L3C support up to 4 counters. Counters are independently
-programmable and can be started and stopped individually. Each counter
-can be set to a different event. Counters are 32-bit and do not support
-an overflow interrupt; they are read every 2 seconds.
+The DMC and L3C support up to 4 counters, while the CCPI2 supports up to 8
+counters. Counters are independently programmable to different events and
+can be started and stopped individually. None of the counters support an
+overflow interrupt. DMC and L3C counters are 32-bit and read every 2 seconds.
+The CCPI2 counters are 64-bit and assumed not to overflow in normal operation.
 
 PMU UNCORE (perf) driver:
 
 The thunderx2_pmu driver registers per-socket perf PMUs for the DMC and
-L3C devices.  Each PMU can be used to count up to 4 events
-simultaneously. The PMUs provide a description of their available events
-and configuration options under sysfs, see
-/sys/devices/uncore_<l3c_S/dmc_S/>; S is the socket id.
+L3C devices.  Each PMU can be used to count up to 4 (DMC/L3C) or up to 8
+(CCPI2) events simultaneously. The PMUs provide a description of their
+available events and configuration options under sysfs, see
+/sys/devices/uncore_<l3c_S/dmc_S/ccpi2_S/>; S is the socket id.
 
 The driver does not support sampling, therefore "perf record" will not
 work. Per-task perf sessions are also not supported.
-- 
2.17.1

[PATCH v6 2/2] drivers/perf: Add CCPI2 PMU support in ThunderX2 UNCORE driver.

[Ganapatrao Prabhakerrao Kulkarni]

CCPI2 is a low-latency high-bandwidth serial interface for inter socket
connectivity of ThunderX2 processors.

CCPI2 PMU supports up to 8 counters per socket. Counters are
independently programmable to different events and can be started and
stopped individually. The CCPI2 counters are 64-bit and do not overflow
in normal operation.

Signed-off-by: Ganapatrao Prabhakerrao Kulkarni <gkulkarni@marvell.com>
---
 drivers/perf/thunderx2_pmu.c | 267 ++++++++++++++++++++++++++++++-----
 1 file changed, 234 insertions(+), 33 deletions(-)

diff --git a/drivers/perf/thunderx2_pmu.c b/drivers/perf/thunderx2_pmu.c
index 43d76c85da56..51b31d6ff2c4 100644
--- a/drivers/perf/thunderx2_pmu.c
+++ b/drivers/perf/thunderx2_pmu.c
@@ -16,23 +16,36 @@
  * they need to be sampled before overflow(i.e, at every 2 seconds).
  */
 
-#define TX2_PMU_MAX_COUNTERS		4
+#define TX2_PMU_DMC_L3C_MAX_COUNTERS	4
+#define TX2_PMU_CCPI2_MAX_COUNTERS	8
+#define TX2_PMU_MAX_COUNTERS		TX2_PMU_CCPI2_MAX_COUNTERS
+
+
 #define TX2_PMU_DMC_CHANNELS		8
 #define TX2_PMU_L3_TILES		16
 
 #define TX2_PMU_HRTIMER_INTERVAL	(2 * NSEC_PER_SEC)
-#define GET_EVENTID(ev)			((ev->hw.config) & 0x1f)
-#define GET_COUNTERID(ev)		((ev->hw.idx) & 0x3)
+#define GET_EVENTID(ev, mask)		((ev->hw.config) & mask)
+#define GET_COUNTERID(ev, mask)		((ev->hw.idx) & mask)
  /* 1 byte per counter(4 counters).
   * Event id is encoded in bits [5:1] of a byte,
   */
 #define DMC_EVENT_CFG(idx, val)		((val) << (((idx) * 8) + 1))
 
+/* bits[3:0] to select counters, are indexed from 8 to 15. */
+#define CCPI2_COUNTER_OFFSET		8
+
 #define L3C_COUNTER_CTL			0xA8
 #define L3C_COUNTER_DATA		0xAC
 #define DMC_COUNTER_CTL			0x234
 #define DMC_COUNTER_DATA		0x240
 
+#define CCPI2_PERF_CTL			0x108
+#define CCPI2_COUNTER_CTL		0x10C
+#define CCPI2_COUNTER_SEL		0x12c
+#define CCPI2_COUNTER_DATA_L		0x130
+#define CCPI2_COUNTER_DATA_H		0x134
+
 /* L3C event IDs */
 #define L3_EVENT_READ_REQ		0xD
 #define L3_EVENT_WRITEBACK_REQ		0xE
@@ -51,15 +64,28 @@
 #define DMC_EVENT_READ_TXNS		0xF
 #define DMC_EVENT_MAX			0x10
 
+#define CCPI2_EVENT_REQ_PKT_SENT	0x3D
+#define CCPI2_EVENT_SNOOP_PKT_SENT	0x65
+#define CCPI2_EVENT_DATA_PKT_SENT	0x105
+#define CCPI2_EVENT_GIC_PKT_SENT	0x12D
+#define CCPI2_EVENT_MAX			0x200
+
+#define CCPI2_PERF_CTL_ENABLE		BIT(0)
+#define CCPI2_PERF_CTL_START		BIT(1)
+#define CCPI2_PERF_CTL_RESET		BIT(4)
+#define CCPI2_EVENT_LEVEL_RISING_EDGE	BIT(10)
+#define CCPI2_EVENT_TYPE_EDGE_SENSITIVE	BIT(11)
+
 enum tx2_uncore_type {
 	PMU_TYPE_L3C,
 	PMU_TYPE_DMC,
+	PMU_TYPE_CCPI2,
 	PMU_TYPE_INVALID,
 };
 
 /*
- * pmu on each socket has 2 uncore devices(dmc and l3c),
- * each device has 4 counters.
+ * Each socket has 3 uncore devices associated with a PMU. The DMC and
+ * L3C have 4 32-bit counters and the CCPI2 has 8 64-bit counters.
  */
 struct tx2_uncore_pmu {
 	struct hlist_node hpnode;
@@ -69,8 +95,10 @@ struct tx2_uncore_pmu {
 	int node;
 	int cpu;
 	u32 max_counters;
+	u32 counters_mask;
 	u32 prorate_factor;
 	u32 max_events;
+	u32 events_mask;
 	u64 hrtimer_interval;
 	void __iomem *base;
 	DECLARE_BITMAP(active_counters, TX2_PMU_MAX_COUNTERS);
@@ -79,6 +107,7 @@ struct tx2_uncore_pmu {
 	struct hrtimer hrtimer;
 	const struct attribute_group **attr_groups;
 	enum tx2_uncore_type type;
+	enum hrtimer_restart (*hrtimer_callback)(struct hrtimer *cb);
 	void (*init_cntr_base)(struct perf_event *event,
 			struct tx2_uncore_pmu *tx2_pmu);
 	void (*stop_event)(struct perf_event *event);
@@ -92,7 +121,21 @@ static inline struct tx2_uncore_pmu *pmu_to_tx2_pmu(struct pmu *pmu)
 	return container_of(pmu, struct tx2_uncore_pmu, pmu);
 }
 
-PMU_FORMAT_ATTR(event,	"config:0-4");
+#define TX2_PMU_FORMAT_ATTR(_var, _name, _format)			\
+static ssize_t								\
+__tx2_pmu_##_var##_show(struct device *dev,				\
+			       struct device_attribute *attr,		\
+			       char *page)				\
+{									\
+	BUILD_BUG_ON(sizeof(_format) >= PAGE_SIZE);			\
+	return sprintf(page, _format "\n");				\
+}									\
+									\
+static struct device_attribute format_attr_##_var =			\
+	__ATTR(_name, 0444, __tx2_pmu_##_var##_show, NULL)
+
+TX2_PMU_FORMAT_ATTR(event, event, "config:0-4");
+TX2_PMU_FORMAT_ATTR(event_ccpi2, event, "config:0-9");
 
 static struct attribute *l3c_pmu_format_attrs[] = {
 	&format_attr_event.attr,
@@ -104,6 +147,11 @@ static struct attribute *dmc_pmu_format_attrs[] = {
 	NULL,
 };
 
+static struct attribute *ccpi2_pmu_format_attrs[] = {
+	&format_attr_event_ccpi2.attr,
+	NULL,
+};
+
 static const struct attribute_group l3c_pmu_format_attr_group = {
 	.name = "format",
 	.attrs = l3c_pmu_format_attrs,
@@ -114,6 +162,11 @@ static const struct attribute_group dmc_pmu_format_attr_group = {
 	.attrs = dmc_pmu_format_attrs,
 };
 
+static const struct attribute_group ccpi2_pmu_format_attr_group = {
+	.name = "format",
+	.attrs = ccpi2_pmu_format_attrs,
+};
+
 /*
  * sysfs event attributes
  */
@@ -164,6 +217,19 @@ static struct attribute *dmc_pmu_events_attrs[] = {
 	NULL,
 };
 
+TX2_EVENT_ATTR(req_pktsent, CCPI2_EVENT_REQ_PKT_SENT);
+TX2_EVENT_ATTR(snoop_pktsent, CCPI2_EVENT_SNOOP_PKT_SENT);
+TX2_EVENT_ATTR(data_pktsent, CCPI2_EVENT_DATA_PKT_SENT);
+TX2_EVENT_ATTR(gic_pktsent, CCPI2_EVENT_GIC_PKT_SENT);
+
+static struct attribute *ccpi2_pmu_events_attrs[] = {
+	&tx2_pmu_event_attr_req_pktsent.attr.attr,
+	&tx2_pmu_event_attr_snoop_pktsent.attr.attr,
+	&tx2_pmu_event_attr_data_pktsent.attr.attr,
+	&tx2_pmu_event_attr_gic_pktsent.attr.attr,
+	NULL,
+};
+
 static const struct attribute_group l3c_pmu_events_attr_group = {
 	.name = "events",
 	.attrs = l3c_pmu_events_attrs,
@@ -174,6 +240,11 @@ static const struct attribute_group dmc_pmu_events_attr_group = {
 	.attrs = dmc_pmu_events_attrs,
 };
 
+static const struct attribute_group ccpi2_pmu_events_attr_group = {
+	.name = "events",
+	.attrs = ccpi2_pmu_events_attrs,
+};
+
 /*
  * sysfs cpumask attributes
  */
@@ -213,6 +284,13 @@ static const struct attribute_group *dmc_pmu_attr_groups[] = {
 	NULL
 };
 
+static const struct attribute_group *ccpi2_pmu_attr_groups[] = {
+	&ccpi2_pmu_format_attr_group,
+	&pmu_cpumask_attr_group,
+	&ccpi2_pmu_events_attr_group,
+	NULL
+};
+
 static inline u32 reg_readl(unsigned long addr)
 {
 	return readl((void __iomem *)addr);
@@ -245,33 +323,58 @@ static void init_cntr_base_l3c(struct perf_event *event,
 		struct tx2_uncore_pmu *tx2_pmu)
 {
 	struct hw_perf_event *hwc = &event->hw;
+	u32 cmask;
+
+	tx2_pmu = pmu_to_tx2_pmu(event->pmu);
+	cmask = tx2_pmu->counters_mask;
 
 	/* counter ctrl/data reg offset at 8 */
 	hwc->config_base = (unsigned long)tx2_pmu->base
-		+ L3C_COUNTER_CTL + (8 * GET_COUNTERID(event));
+		+ L3C_COUNTER_CTL + (8 * GET_COUNTERID(event, cmask));
 	hwc->event_base =  (unsigned long)tx2_pmu->base
-		+ L3C_COUNTER_DATA + (8 * GET_COUNTERID(event));
+		+ L3C_COUNTER_DATA + (8 * GET_COUNTERID(event, cmask));
 }
 
 static void init_cntr_base_dmc(struct perf_event *event,
 		struct tx2_uncore_pmu *tx2_pmu)
 {
 	struct hw_perf_event *hwc = &event->hw;
+	u32 cmask;
+
+	tx2_pmu = pmu_to_tx2_pmu(event->pmu);
+	cmask = tx2_pmu->counters_mask;
 
 	hwc->config_base = (unsigned long)tx2_pmu->base
 		+ DMC_COUNTER_CTL;
 	/* counter data reg offset at 0xc */
 	hwc->event_base = (unsigned long)tx2_pmu->base
-		+ DMC_COUNTER_DATA + (0xc * GET_COUNTERID(event));
+		+ DMC_COUNTER_DATA + (0xc * GET_COUNTERID(event, cmask));
+}
+
+static void init_cntr_base_ccpi2(struct perf_event *event,
+		struct tx2_uncore_pmu *tx2_pmu)
+{
+	struct hw_perf_event *hwc = &event->hw;
+	u32 cmask;
+
+	cmask = tx2_pmu->counters_mask;
+
+	hwc->config_base = (unsigned long)tx2_pmu->base
+		+ CCPI2_COUNTER_CTL + (4 * GET_COUNTERID(event, cmask));
+	hwc->event_base =  (unsigned long)tx2_pmu->base;
 }
 
 static void uncore_start_event_l3c(struct perf_event *event, int flags)
 {
-	u32 val;
+	u32 val, emask;
 	struct hw_perf_event *hwc = &event->hw;
+	struct tx2_uncore_pmu *tx2_pmu;
+
+	tx2_pmu = pmu_to_tx2_pmu(event->pmu);
+	emask = tx2_pmu->events_mask;
 
 	/* event id encoded in bits [07:03] */
-	val = GET_EVENTID(event) << 3;
+	val = GET_EVENTID(event, emask) << 3;
 	reg_writel(val, hwc->config_base);
 	local64_set(&hwc->prev_count, 0);
 	reg_writel(0, hwc->event_base);
@@ -284,10 +387,17 @@ static inline void uncore_stop_event_l3c(struct perf_event *event)
 
 static void uncore_start_event_dmc(struct perf_event *event, int flags)
 {
-	u32 val;
+	u32 val, cmask, emask;
 	struct hw_perf_event *hwc = &event->hw;
-	int idx = GET_COUNTERID(event);
-	int event_id = GET_EVENTID(event);
+	struct tx2_uncore_pmu *tx2_pmu;
+	int idx, event_id;
+
+	tx2_pmu = pmu_to_tx2_pmu(event->pmu);
+	cmask = tx2_pmu->counters_mask;
+	emask = tx2_pmu->events_mask;
+
+	idx = GET_COUNTERID(event, cmask);
+	event_id = GET_EVENTID(event, emask);
 
 	/* enable and start counters.
 	 * 8 bits for each counter, bits[05:01] of a counter to set event type.
@@ -302,9 +412,14 @@ static void uncore_start_event_dmc(struct perf_event *event, int flags)
 
 static void uncore_stop_event_dmc(struct perf_event *event)
 {
-	u32 val;
+	u32 val, cmask;
 	struct hw_perf_event *hwc = &event->hw;
-	int idx = GET_COUNTERID(event);
+	struct tx2_uncore_pmu *tx2_pmu;
+	int idx;
+
+	tx2_pmu = pmu_to_tx2_pmu(event->pmu);
+	cmask = tx2_pmu->counters_mask;
+	idx = GET_COUNTERID(event, cmask);
 
 	/* clear event type(bits[05:01]) to stop counter */
 	val = reg_readl(hwc->config_base);
@@ -312,27 +427,72 @@ static void uncore_stop_event_dmc(struct perf_event *event)
 	reg_writel(val, hwc->config_base);
 }
 
+static void uncore_start_event_ccpi2(struct perf_event *event, int flags)
+{
+	u32 emask;
+	struct hw_perf_event *hwc = &event->hw;
+	struct tx2_uncore_pmu *tx2_pmu;
+
+	tx2_pmu = pmu_to_tx2_pmu(event->pmu);
+	emask = tx2_pmu->events_mask;
+
+	/* Bit [09:00] to set event id.
+	 * Bits [10], set level to rising edge.
+	 * Bits [11], set type to edge sensitive.
+	 */
+	reg_writel((CCPI2_EVENT_TYPE_EDGE_SENSITIVE |
+			CCPI2_EVENT_LEVEL_RISING_EDGE |
+			GET_EVENTID(event, emask)), hwc->config_base);
+
+	/* reset[4], enable[0] and start[1] counters */
+	reg_writel(CCPI2_PERF_CTL_RESET |
+			CCPI2_PERF_CTL_START |
+			CCPI2_PERF_CTL_ENABLE,
+			hwc->event_base + CCPI2_PERF_CTL);
+	local64_set(&event->hw.prev_count, 0ULL);
+}
+
+static void uncore_stop_event_ccpi2(struct perf_event *event)
+{
+	struct hw_perf_event *hwc = &event->hw;
+
+	/* disable and stop counter */
+	reg_writel(0, hwc->event_base + CCPI2_PERF_CTL);
+}
+
 static void tx2_uncore_event_update(struct perf_event *event)
 {
-	s64 prev, delta, new = 0;
+	u64 prev, delta, new = 0;
 	struct hw_perf_event *hwc = &event->hw;
 	struct tx2_uncore_pmu *tx2_pmu;
 	enum tx2_uncore_type type;
 	u32 prorate_factor;
+	u32 cmask, emask;
 
 	tx2_pmu = pmu_to_tx2_pmu(event->pmu);
 	type = tx2_pmu->type;
+	cmask = tx2_pmu->counters_mask;
+	emask = tx2_pmu->events_mask;
 	prorate_factor = tx2_pmu->prorate_factor;
-
-	new = reg_readl(hwc->event_base);
-	prev = local64_xchg(&hwc->prev_count, new);
-
-	/* handles rollover of 32 bit counter */
-	delta = (u32)(((1UL << 32) - prev) + new);
+	if (type == PMU_TYPE_CCPI2) {
+		reg_writel(CCPI2_COUNTER_OFFSET +
+				GET_COUNTERID(event, cmask),
+				hwc->event_base + CCPI2_COUNTER_SEL);
+		new = reg_readl(hwc->event_base + CCPI2_COUNTER_DATA_H);
+		new = (new << 32) +
+			reg_readl(hwc->event_base + CCPI2_COUNTER_DATA_L);
+		prev = local64_xchg(&hwc->prev_count, new);
+		delta = new - prev;
+	} else {
+		new = reg_readl(hwc->event_base);
+		prev = local64_xchg(&hwc->prev_count, new);
+		/* handles rollover of 32 bit counter */
+		delta = (u32)(((1UL << 32) - prev) + new);
+	}
 
 	/* DMC event data_transfers granularity is 16 Bytes, convert it to 64 */
 	if (type == PMU_TYPE_DMC &&
-			GET_EVENTID(event) == DMC_EVENT_DATA_TRANSFERS)
+			GET_EVENTID(event, emask) == DMC_EVENT_DATA_TRANSFERS)
 		delta = delta/4;
 
 	/* L3C and DMC has 16 and 8 interleave channels respectively.
@@ -351,6 +511,7 @@ static enum tx2_uncore_type get_tx2_pmu_type(struct acpi_device *adev)
 	} devices[] = {
 		{"CAV901D", PMU_TYPE_L3C},
 		{"CAV901F", PMU_TYPE_DMC},
+		{"CAV901E", PMU_TYPE_CCPI2},
 		{"", PMU_TYPE_INVALID}
 	};
 
@@ -380,7 +541,8 @@ static bool tx2_uncore_validate_event(struct pmu *pmu,
  * Make sure the group of events can be scheduled at once
  * on the PMU.
  */
-static bool tx2_uncore_validate_event_group(struct perf_event *event)
+static bool tx2_uncore_validate_event_group(struct perf_event *event,
+		int max_counters)
 {
 	struct perf_event *sibling, *leader = event->group_leader;
 	int counters = 0;
@@ -403,7 +565,7 @@ static bool tx2_uncore_validate_event_group(struct perf_event *event)
 	 * If the group requires more counters than the HW has,
 	 * it cannot ever be scheduled.
 	 */
-	return counters <= TX2_PMU_MAX_COUNTERS;
+	return counters <= max_counters;
 }
 
 
@@ -439,7 +601,7 @@ static int tx2_uncore_event_init(struct perf_event *event)
 	hwc->config = event->attr.config;
 
 	/* Validate the group */
-	if (!tx2_uncore_validate_event_group(event))
+	if (!tx2_uncore_validate_event_group(event, tx2_pmu->max_counters))
 		return -EINVAL;
 
 	return 0;
@@ -456,6 +618,10 @@ static void tx2_uncore_event_start(struct perf_event *event, int flags)
 	tx2_pmu->start_event(event, flags);
 	perf_event_update_userpage(event);
 
+	/* No hrtimer needed for CCPI2, 64-bit counters */
+	if (!tx2_pmu->hrtimer_callback)
+		return;
+
 	/* Start timer for first event */
 	if (bitmap_weight(tx2_pmu->active_counters,
 				tx2_pmu->max_counters) == 1) {
@@ -510,15 +676,23 @@ static void tx2_uncore_event_del(struct perf_event *event, int flags)
 {
 	struct tx2_uncore_pmu *tx2_pmu = pmu_to_tx2_pmu(event->pmu);
 	struct hw_perf_event *hwc = &event->hw;
+	u32 cmask;
 
+	cmask = tx2_pmu->counters_mask;
 	tx2_uncore_event_stop(event, PERF_EF_UPDATE);
 
 	/* clear the assigned counter */
-	free_counter(tx2_pmu, GET_COUNTERID(event));
+	free_counter(tx2_pmu, GET_COUNTERID(event, cmask));
 
 	perf_event_update_userpage(event);
 	tx2_pmu->events[hwc->idx] = NULL;
 	hwc->idx = -1;
+
+	if (!tx2_pmu->hrtimer_callback)
+		return;
+
+	if (bitmap_empty(tx2_pmu->active_counters, tx2_pmu->max_counters))
+		hrtimer_cancel(&tx2_pmu->hrtimer);
 }
 
 static void tx2_uncore_event_read(struct perf_event *event)
@@ -580,8 +754,12 @@ static int tx2_uncore_pmu_add_dev(struct tx2_uncore_pmu *tx2_pmu)
 			cpu_online_mask);
 
 	tx2_pmu->cpu = cpu;
-	hrtimer_init(&tx2_pmu->hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
-	tx2_pmu->hrtimer.function = tx2_hrtimer_callback;
+
+	if (tx2_pmu->hrtimer_callback) {
+		hrtimer_init(&tx2_pmu->hrtimer,
+				CLOCK_MONOTONIC, HRTIMER_MODE_REL);
+		tx2_pmu->hrtimer.function = tx2_pmu->hrtimer_callback;
+	}
 
 	ret = tx2_uncore_pmu_register(tx2_pmu);
 	if (ret) {
@@ -653,10 +831,13 @@ static struct tx2_uncore_pmu *tx2_uncore_pmu_init_dev(struct device *dev,
 
 	switch (tx2_pmu->type) {
 	case PMU_TYPE_L3C:
-		tx2_pmu->max_counters = TX2_PMU_MAX_COUNTERS;
+		tx2_pmu->max_counters = TX2_PMU_DMC_L3C_MAX_COUNTERS;
+		tx2_pmu->counters_mask = 0x3;
 		tx2_pmu->prorate_factor = TX2_PMU_L3_TILES;
 		tx2_pmu->max_events = L3_EVENT_MAX;
+		tx2_pmu->events_mask = 0x1f;
 		tx2_pmu->hrtimer_interval = TX2_PMU_HRTIMER_INTERVAL;
+		tx2_pmu->hrtimer_callback = tx2_hrtimer_callback;
 		tx2_pmu->attr_groups = l3c_pmu_attr_groups;
 		tx2_pmu->name = devm_kasprintf(dev, GFP_KERNEL,
 				"uncore_l3c_%d", tx2_pmu->node);
@@ -665,10 +846,13 @@ static struct tx2_uncore_pmu *tx2_uncore_pmu_init_dev(struct device *dev,
 		tx2_pmu->stop_event = uncore_stop_event_l3c;
 		break;
 	case PMU_TYPE_DMC:
-		tx2_pmu->max_counters = TX2_PMU_MAX_COUNTERS;
+		tx2_pmu->max_counters = TX2_PMU_DMC_L3C_MAX_COUNTERS;
+		tx2_pmu->counters_mask = 0x3;
 		tx2_pmu->prorate_factor = TX2_PMU_DMC_CHANNELS;
 		tx2_pmu->max_events = DMC_EVENT_MAX;
+		tx2_pmu->events_mask = 0x1f;
 		tx2_pmu->hrtimer_interval = TX2_PMU_HRTIMER_INTERVAL;
+		tx2_pmu->hrtimer_callback = tx2_hrtimer_callback;
 		tx2_pmu->attr_groups = dmc_pmu_attr_groups;
 		tx2_pmu->name = devm_kasprintf(dev, GFP_KERNEL,
 				"uncore_dmc_%d", tx2_pmu->node);
@@ -676,6 +860,21 @@ static struct tx2_uncore_pmu *tx2_uncore_pmu_init_dev(struct device *dev,
 		tx2_pmu->start_event = uncore_start_event_dmc;
 		tx2_pmu->stop_event = uncore_stop_event_dmc;
 		break;
+	case PMU_TYPE_CCPI2:
+		/* CCPI2 has 8 counters */
+		tx2_pmu->max_counters = TX2_PMU_CCPI2_MAX_COUNTERS;
+		tx2_pmu->counters_mask = 0x7;
+		tx2_pmu->prorate_factor = 1;
+		tx2_pmu->max_events = CCPI2_EVENT_MAX;
+		tx2_pmu->events_mask = 0x1ff;
+		tx2_pmu->attr_groups = ccpi2_pmu_attr_groups;
+		tx2_pmu->name = devm_kasprintf(dev, GFP_KERNEL,
+				"uncore_ccpi2_%d", tx2_pmu->node);
+		tx2_pmu->init_cntr_base = init_cntr_base_ccpi2;
+		tx2_pmu->start_event = uncore_start_event_ccpi2;
+		tx2_pmu->stop_event = uncore_stop_event_ccpi2;
+		tx2_pmu->hrtimer_callback = NULL;
+		break;
 	case PMU_TYPE_INVALID:
 		devm_kfree(dev, tx2_pmu);
 		return NULL;
@@ -744,7 +943,9 @@ static int tx2_uncore_pmu_offline_cpu(unsigned int cpu,
 	if (cpu != tx2_pmu->cpu)
 		return 0;
 
-	hrtimer_cancel(&tx2_pmu->hrtimer);
+	if (tx2_pmu->hrtimer_callback)
+		hrtimer_cancel(&tx2_pmu->hrtimer);
+
 	cpumask_copy(&cpu_online_mask_temp, cpu_online_mask);
 	cpumask_clear_cpu(cpu, &cpu_online_mask_temp);
 	new_cpu = cpumask_any_and(
-- 
2.17.1

Re: [PATCH v6 2/2] drivers/perf: Add CCPI2 PMU support in ThunderX2 UNCORE driver.

[John Garry]

> +TX2_EVENT_ATTR(req_pktsent, CCPI2_EVENT_REQ_PKT_SENT);
> +TX2_EVENT_ATTR(snoop_pktsent, CCPI2_EVENT_SNOOP_PKT_SENT);
> +TX2_EVENT_ATTR(data_pktsent, CCPI2_EVENT_DATA_PKT_SENT);
> +TX2_EVENT_ATTR(gic_pktsent, CCPI2_EVENT_GIC_PKT_SENT);
> +
> +static struct attribute *ccpi2_pmu_events_attrs[] = {
> +	&tx2_pmu_event_attr_req_pktsent.attr.attr,
> +	&tx2_pmu_event_attr_snoop_pktsent.attr.attr,
> +	&tx2_pmu_event_attr_data_pktsent.attr.attr,
> +	&tx2_pmu_event_attr_gic_pktsent.attr.attr,
> +	NULL,
> +};

Hi Ganapatrao,

Have you considered adding these as uncore pmu-events in the perf tool?

Some advantages I see:
- perf list is not swamped with all these uncore events per PMU
For the Hisi uncore events, we get 100s of events (>600 on the board I 
just tested, which is crazy)
- can add more description in the JSON files
- less stuff in the kernel

> +
>  static const struct attribute_group l3c_pmu_events_attr_group = {
>  	.name = "events",
>  	.attrs = l3c_pmu_events_attrs,
> @@ -174,6 +240,11 @@ static const struct attribute_group dmc_pmu_events_attr_group = {
>  	.attrs = dmc_pmu_events_attrs,
>  };

[...]

>  		tx2_pmu->attr_groups = l3c_pmu_attr_groups;
>  		tx2_pmu->name = devm_kasprintf(dev, GFP_KERNEL,
>  				"uncore_l3c_%d", tx2_pmu->node);
> @@ -665,10 +846,13 @@ static struct tx2_uncore_pmu *tx2_uncore_pmu_init_dev(struct device *dev,
>  		tx2_pmu->stop_event = uncore_stop_event_l3c;
>  		break;
>  	case PMU_TYPE_DMC:
> -		tx2_pmu->max_counters = TX2_PMU_MAX_COUNTERS;
> +		tx2_pmu->max_counters = TX2_PMU_DMC_L3C_MAX_COUNTERS;
> +		tx2_pmu->counters_mask = 0x3;
>  		tx2_pmu->prorate_factor = TX2_PMU_DMC_CHANNELS;
>  		tx2_pmu->max_events = DMC_EVENT_MAX;
> +		tx2_pmu->events_mask = 0x1f;
>  		tx2_pmu->hrtimer_interval = TX2_PMU_HRTIMER_INTERVAL;
> +		tx2_pmu->hrtimer_callback = tx2_hrtimer_callback;
>  		tx2_pmu->attr_groups = dmc_pmu_attr_groups;
>  		tx2_pmu->name = devm_kasprintf(dev, GFP_KERNEL,
>  				"uncore_dmc_%d", tx2_pmu->node);
> @@ -676,6 +860,21 @@ static struct tx2_uncore_pmu *tx2_uncore_pmu_init_dev(struct device *dev,
>  		tx2_pmu->start_event = uncore_start_event_dmc;
>  		tx2_pmu->stop_event = uncore_stop_event_dmc;
>  		break;
> +	case PMU_TYPE_CCPI2:
> +		/* CCPI2 has 8 counters */
> +		tx2_pmu->max_counters = TX2_PMU_CCPI2_MAX_COUNTERS;
> +		tx2_pmu->counters_mask = 0x7;
> +		tx2_pmu->prorate_factor = 1;
> +		tx2_pmu->max_events = CCPI2_EVENT_MAX;
> +		tx2_pmu->events_mask = 0x1ff;
> +		tx2_pmu->attr_groups = ccpi2_pmu_attr_groups;
> +		tx2_pmu->name = devm_kasprintf(dev, GFP_KERNEL,
> +				"uncore_ccpi2_%d", tx2_pmu->node);

Do you need to check this for name == NULL?

> +		tx2_pmu->init_cntr_base = init_cntr_base_ccpi2;
> +		tx2_pmu->start_event = uncore_start_event_ccpi2;
> +		tx2_pmu->stop_event = uncore_stop_event_ccpi2;
> +		tx2_pmu->hrtimer_callback = NULL;
> +		break;
>  	case PMU_TYPE_INVALID:
>  		devm_kfree(dev, tx2_pmu);
>  		return NULL;
> @@ -744,7 +943,9 @@ static int tx2_uncore_pmu_offline_cpu(unsigned int cpu,
>  	if (cpu != tx2_pmu->cpu)
>  		return 0;
>
> -	hrtimer_cancel(&tx2_pmu->hrtimer);
> +	if (tx2_pmu->hrtimer_callback)
> +		hrtimer_cancel(&tx2_pmu->hrtimer);
> +
>  	cpumask_copy(&cpu_online_mask_temp, cpu_online_mask);
>  	cpumask_clear_cpu(cpu, &cpu_online_mask_temp);
>  	new_cpu = cpumask_any_and(
>

Thanks,
John

Re: [PATCH v6 2/2] drivers/perf: Add CCPI2 PMU support in ThunderX2 UNCORE driver.

[Ganapatrao Kulkarni]

Hi John,

On Wed, Oct 16, 2019 at 7:01 PM John Garry <john.garry@huawei.com> wrote:
>
>
> > +TX2_EVENT_ATTR(req_pktsent, CCPI2_EVENT_REQ_PKT_SENT);
> > +TX2_EVENT_ATTR(snoop_pktsent, CCPI2_EVENT_SNOOP_PKT_SENT);
> > +TX2_EVENT_ATTR(data_pktsent, CCPI2_EVENT_DATA_PKT_SENT);
> > +TX2_EVENT_ATTR(gic_pktsent, CCPI2_EVENT_GIC_PKT_SENT);
> > +
> > +static struct attribute *ccpi2_pmu_events_attrs[] = {
> > +     &tx2_pmu_event_attr_req_pktsent.attr.attr,
> > +     &tx2_pmu_event_attr_snoop_pktsent.attr.attr,
> > +     &tx2_pmu_event_attr_data_pktsent.attr.attr,
> > +     &tx2_pmu_event_attr_gic_pktsent.attr.attr,
> > +     NULL,
> > +};
>
> Hi Ganapatrao,
>
> Have you considered adding these as uncore pmu-events in the perf tool?
>
At the moment no, since the number of events exposed/listed are very few.

> Some advantages I see:
> - perf list is not swamped with all these uncore events per PMU
> For the Hisi uncore events, we get 100s of events (>600 on the board I
> just tested, which is crazy)
> - can add more description in the JSON files
> - less stuff in the kernel
>
> > +
> >  static const struct attribute_group l3c_pmu_events_attr_group = {
> >       .name = "events",
> >       .attrs = l3c_pmu_events_attrs,
> > @@ -174,6 +240,11 @@ static const struct attribute_group dmc_pmu_events_attr_group = {
> >       .attrs = dmc_pmu_events_attrs,
> >  };
>
> [...]
>
> >               tx2_pmu->attr_groups = l3c_pmu_attr_groups;
> >               tx2_pmu->name = devm_kasprintf(dev, GFP_KERNEL,
> >                               "uncore_l3c_%d", tx2_pmu->node);
> > @@ -665,10 +846,13 @@ static struct tx2_uncore_pmu *tx2_uncore_pmu_init_dev(struct device *dev,
> >               tx2_pmu->stop_event = uncore_stop_event_l3c;
> >               break;
> >       case PMU_TYPE_DMC:
> > -             tx2_pmu->max_counters = TX2_PMU_MAX_COUNTERS;
> > +             tx2_pmu->max_counters = TX2_PMU_DMC_L3C_MAX_COUNTERS;
> > +             tx2_pmu->counters_mask = 0x3;
> >               tx2_pmu->prorate_factor = TX2_PMU_DMC_CHANNELS;
> >               tx2_pmu->max_events = DMC_EVENT_MAX;
> > +             tx2_pmu->events_mask = 0x1f;
> >               tx2_pmu->hrtimer_interval = TX2_PMU_HRTIMER_INTERVAL;
> > +             tx2_pmu->hrtimer_callback = tx2_hrtimer_callback;
> >               tx2_pmu->attr_groups = dmc_pmu_attr_groups;
> >               tx2_pmu->name = devm_kasprintf(dev, GFP_KERNEL,
> >                               "uncore_dmc_%d", tx2_pmu->node);
> > @@ -676,6 +860,21 @@ static struct tx2_uncore_pmu *tx2_uncore_pmu_init_dev(struct device *dev,
> >               tx2_pmu->start_event = uncore_start_event_dmc;
> >               tx2_pmu->stop_event = uncore_stop_event_dmc;
> >               break;
> > +     case PMU_TYPE_CCPI2:
> > +             /* CCPI2 has 8 counters */
> > +             tx2_pmu->max_counters = TX2_PMU_CCPI2_MAX_COUNTERS;
> > +             tx2_pmu->counters_mask = 0x7;
> > +             tx2_pmu->prorate_factor = 1;
> > +             tx2_pmu->max_events = CCPI2_EVENT_MAX;
> > +             tx2_pmu->events_mask = 0x1ff;
> > +             tx2_pmu->attr_groups = ccpi2_pmu_attr_groups;
> > +             tx2_pmu->name = devm_kasprintf(dev, GFP_KERNEL,
> > +                             "uncore_ccpi2_%d", tx2_pmu->node);
>
> Do you need to check this for name == NULL?
>
> > +             tx2_pmu->init_cntr_base = init_cntr_base_ccpi2;
> > +             tx2_pmu->start_event = uncore_start_event_ccpi2;
> > +             tx2_pmu->stop_event = uncore_stop_event_ccpi2;
> > +             tx2_pmu->hrtimer_callback = NULL;
> > +             break;
> >       case PMU_TYPE_INVALID:
> >               devm_kfree(dev, tx2_pmu);
> >               return NULL;
> > @@ -744,7 +943,9 @@ static int tx2_uncore_pmu_offline_cpu(unsigned int cpu,
> >       if (cpu != tx2_pmu->cpu)
> >               return 0;
> >
> > -     hrtimer_cancel(&tx2_pmu->hrtimer);
> > +     if (tx2_pmu->hrtimer_callback)
> > +             hrtimer_cancel(&tx2_pmu->hrtimer);
> > +
> >       cpumask_copy(&cpu_online_mask_temp, cpu_online_mask);
> >       cpumask_clear_cpu(cpu, &cpu_online_mask_temp);
> >       new_cpu = cpumask_any_and(
> >
>
> Thanks,
> John
>
>

Thanks,
Ganapat

Re: [PATCH v6 2/2] drivers/perf: Add CCPI2 PMU support in ThunderX2 UNCORE driver.

[Will Deacon]

On Thu, Oct 17, 2019 at 12:38:51PM +0530, Ganapatrao Kulkarni wrote:
> On Wed, Oct 16, 2019 at 7:01 PM John Garry <john.garry@huawei.com> wrote:
> > > +TX2_EVENT_ATTR(req_pktsent, CCPI2_EVENT_REQ_PKT_SENT);
> > > +TX2_EVENT_ATTR(snoop_pktsent, CCPI2_EVENT_SNOOP_PKT_SENT);
> > > +TX2_EVENT_ATTR(data_pktsent, CCPI2_EVENT_DATA_PKT_SENT);
> > > +TX2_EVENT_ATTR(gic_pktsent, CCPI2_EVENT_GIC_PKT_SENT);
> > > +
> > > +static struct attribute *ccpi2_pmu_events_attrs[] = {
> > > +     &tx2_pmu_event_attr_req_pktsent.attr.attr,
> > > +     &tx2_pmu_event_attr_snoop_pktsent.attr.attr,
> > > +     &tx2_pmu_event_attr_data_pktsent.attr.attr,
> > > +     &tx2_pmu_event_attr_gic_pktsent.attr.attr,
> > > +     NULL,
> > > +};
> >
> > Hi Ganapatrao,
> >
> > Have you considered adding these as uncore pmu-events in the perf tool?
> >
> At the moment no, since the number of events exposed/listed are very few.

Then sounds like a perfect time to nip it in the bud before the list grows
;)

If you can manage with these things in userspace, then I agree with John
that it would be preferential to do it that way. It also offers more
flexibility if we get the metricgroup stuff working properly (I think it's
buggered for big/little atm).

Will

Re: [PATCH v6 2/2] drivers/perf: Add CCPI2 PMU support in ThunderX2 UNCORE driver.

[Ganapatrao Kulkarni]

Hi Will,

On Thu, Oct 17, 2019 at 9:17 PM Will Deacon <will@kernel.org> wrote:
>
> On Thu, Oct 17, 2019 at 12:38:51PM +0530, Ganapatrao Kulkarni wrote:
> > On Wed, Oct 16, 2019 at 7:01 PM John Garry <john.garry@huawei.com> wrote:
> > > > +TX2_EVENT_ATTR(req_pktsent, CCPI2_EVENT_REQ_PKT_SENT);
> > > > +TX2_EVENT_ATTR(snoop_pktsent, CCPI2_EVENT_SNOOP_PKT_SENT);
> > > > +TX2_EVENT_ATTR(data_pktsent, CCPI2_EVENT_DATA_PKT_SENT);
> > > > +TX2_EVENT_ATTR(gic_pktsent, CCPI2_EVENT_GIC_PKT_SENT);
> > > > +
> > > > +static struct attribute *ccpi2_pmu_events_attrs[] = {
> > > > +     &tx2_pmu_event_attr_req_pktsent.attr.attr,
> > > > +     &tx2_pmu_event_attr_snoop_pktsent.attr.attr,
> > > > +     &tx2_pmu_event_attr_data_pktsent.attr.attr,
> > > > +     &tx2_pmu_event_attr_gic_pktsent.attr.attr,
> > > > +     NULL,
> > > > +};
> > >
> > > Hi Ganapatrao,
> > >
> > > Have you considered adding these as uncore pmu-events in the perf tool?
> > >
> > At the moment no, since the number of events exposed/listed are very few.
>
> Then sounds like a perfect time to nip it in the bud before the list grows
> ;)

I had internal discussion with architecture team, they have confirmed
that, these are the only published events and no plan to add new.
However, If any such request comes from HW team in future, i will add
them to JSON files.

I have incorporate all your previous comments, Can you please Ack and
queue it to 5.5?

>
> If you can manage with these things in userspace, then I agree with John
> that it would be preferential to do it that way. It also offers more
> flexibility if we get the metricgroup stuff working properly (I think it's
> buggered for big/little atm).
>
> Will

Thanks,
Ganapat

Re: [PATCH v6 2/2] drivers/perf: Add CCPI2 PMU support in ThunderX2 UNCORE driver.

[John Garry]

On 18/10/2019 05:21, Ganapatrao Kulkarni wrote:
> Hi Will,
>
> On Thu, Oct 17, 2019 at 9:17 PM Will Deacon <will@kernel.org> wrote:
>>
>> On Thu, Oct 17, 2019 at 12:38:51PM +0530, Ganapatrao Kulkarni wrote:
>>> On Wed, Oct 16, 2019 at 7:01 PM John Garry <john.garry@huawei.com> wrote:
>>>>> +TX2_EVENT_ATTR(req_pktsent, CCPI2_EVENT_REQ_PKT_SENT);
>>>>> +TX2_EVENT_ATTR(snoop_pktsent, CCPI2_EVENT_SNOOP_PKT_SENT);
>>>>> +TX2_EVENT_ATTR(data_pktsent, CCPI2_EVENT_DATA_PKT_SENT);
>>>>> +TX2_EVENT_ATTR(gic_pktsent, CCPI2_EVENT_GIC_PKT_SENT);
>>>>> +
>>>>> +static struct attribute *ccpi2_pmu_events_attrs[] = {
>>>>> +     &tx2_pmu_event_attr_req_pktsent.attr.attr,
>>>>> +     &tx2_pmu_event_attr_snoop_pktsent.attr.attr,
>>>>> +     &tx2_pmu_event_attr_data_pktsent.attr.attr,
>>>>> +     &tx2_pmu_event_attr_gic_pktsent.attr.attr,
>>>>> +     NULL,
>>>>> +};
>>>>
>>>> Hi Ganapatrao,
>>>>
>>>> Have you considered adding these as uncore pmu-events in the perf tool?
>>>>
>>> At the moment no, since the number of events exposed/listed are very few.
>>
>> Then sounds like a perfect time to nip it in the bud before the list grows
>> ;)
>
> I had internal discussion with architecture team, they have confirmed
> that, these are the only published events and no plan to add new.
> However, If any such request comes from HW team in future, i will add
> them to JSON files.

Don't you find perf list is swamped with all the uncore events?

For Huawei platform, I find this:
./perf list pmu | grep "Kernel PMU event" | grep hisi | wc -l
648

That's because we have so many instances of the same PMUs, not because 
there are many events per PMU.

TBH, I would like to delete all the events from the hisi uncore kernel 
drivers, now that they're supported in the perf tool, but I think that 
would constitute an ABI breakage.

Maybe there is a way to hide them, but I couldn't find it.

John

>
> I have incorporate all your previous comments, Can you please Ack and
> queue it to 5.5?
>
>>
>> If you can manage with these things in userspace, then I agree with John
>> that it would be preferential to do it that way. It also offers more
>> flexibility if we get the metricgroup stuff working properly (I think it's
>> buggered for big/little atm).
>>
>> Will
>
> Thanks,
> Ganapat
>
> .
>

Re: [PATCH v6 2/2] drivers/perf: Add CCPI2 PMU support in ThunderX2 UNCORE driver.

[Ganapatrao Kulkarni]

On Fri, Oct 18, 2019 at 2:08 PM John Garry <john.garry@huawei.com> wrote:
>
> On 18/10/2019 05:21, Ganapatrao Kulkarni wrote:
> > Hi Will,
> >
> > On Thu, Oct 17, 2019 at 9:17 PM Will Deacon <will@kernel.org> wrote:
> >>
> >> On Thu, Oct 17, 2019 at 12:38:51PM +0530, Ganapatrao Kulkarni wrote:
> >>> On Wed, Oct 16, 2019 at 7:01 PM John Garry <john.garry@huawei.com> wrote:
> >>>>> +TX2_EVENT_ATTR(req_pktsent, CCPI2_EVENT_REQ_PKT_SENT);
> >>>>> +TX2_EVENT_ATTR(snoop_pktsent, CCPI2_EVENT_SNOOP_PKT_SENT);
> >>>>> +TX2_EVENT_ATTR(data_pktsent, CCPI2_EVENT_DATA_PKT_SENT);
> >>>>> +TX2_EVENT_ATTR(gic_pktsent, CCPI2_EVENT_GIC_PKT_SENT);
> >>>>> +
> >>>>> +static struct attribute *ccpi2_pmu_events_attrs[] = {
> >>>>> +     &tx2_pmu_event_attr_req_pktsent.attr.attr,
> >>>>> +     &tx2_pmu_event_attr_snoop_pktsent.attr.attr,
> >>>>> +     &tx2_pmu_event_attr_data_pktsent.attr.attr,
> >>>>> +     &tx2_pmu_event_attr_gic_pktsent.attr.attr,
> >>>>> +     NULL,
> >>>>> +};
> >>>>
> >>>> Hi Ganapatrao,
> >>>>
> >>>> Have you considered adding these as uncore pmu-events in the perf tool?
> >>>>
> >>> At the moment no, since the number of events exposed/listed are very few.
> >>
> >> Then sounds like a perfect time to nip it in the bud before the list grows
> >> ;)
> >
> > I had internal discussion with architecture team, they have confirmed
> > that, these are the only published events and no plan to add new.
> > However, If any such request comes from HW team in future, i will add
> > them to JSON files.
>
> Don't you find perf list is swamped with all the uncore events?
>
> For Huawei platform, I find this:
> ./perf list pmu | grep "Kernel PMU event" | grep hisi | wc -l
> 648
>

We don't have such issue at the moment. As i said earlier, the events
exposed are limited.
Total 16 events altogether(DMC, L3C and CCPI2) per socket.

root@SBR-26>~>> perf list | grep uncore | wc -l
32

> That's because we have so many instances of the same PMUs, not because
> there are many events per PMU.
>
> TBH, I would like to delete all the events from the hisi uncore kernel
> drivers, now that they're supported in the perf tool, but I think that
> would constitute an ABI breakage.
>
> Maybe there is a way to hide them, but I couldn't find it.
>
> John
>
> >
> > I have incorporate all your previous comments, Can you please Ack and
> > queue it to 5.5?
> >
> >>
> >> If you can manage with these things in userspace, then I agree with John
> >> that it would be preferential to do it that way. It also offers more
> >> flexibility if we get the metricgroup stuff working properly (I think it's
> >> buggered for big/little atm).
> >>
> >> Will
> >
> > Thanks,
> > Ganapat
> >
> > .
> >
>
>

Thanks,
Ganapat

Re: [PATCH v6 0/2] Add CCPI2 PMU support

[Will Deacon]

On Wed, Oct 16, 2019 at 09:36:57AM +0000, Ganapatrao Prabhakerrao Kulkarni wrote:
> Add Cavium Coherent Processor Interconnect (CCPI2) PMU
> support in ThunderX2 Uncore driver.
> 
> v6:
> 	Rebased to 5.4-rc1

Thanks, this looks good to me so I'll queue it up for 5.5.

Will