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Message-Id: <20190830125436.16959-3-ganapat@localhost.localdomain>
Date: Fri, 30 Aug 2019 18:24:36 +0530
From: ganapat <gklkml16@...il.com>
To: linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org
Cc: will@...nel.org, mark.rutland@....com, corbet@....net,
jnair@...vell.com, rrichter@...vell.com, jglauber@...vell.com,
gkulkarni@...vell.com
Subject: [PATCH v5 2/2] drivers/perf: Add CCPI2 PMU support in ThunderX2 UNCORE driver.
From: Ganapatrao Kulkarni <gkulkarni@...vell.com>
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 Kulkarni <gkulkarni@...vell.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..67c6a7140130 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
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