From: Greentime Hu <greentime.hu@xxxxxxxxxx>
The SiFive private L2 cache PMU is per-core and supports
per-task profiling and event counting. Users can use the
perf tool to profile by event name and event id.
Example:
$ perf stat -C 0 -e /sifive_pl2_pmu/inner_acquire_block_btot/
-e /sifive_pl2_pmu/inner_acquire_block_ntob/
-e /sifive_pl2_pmu/inner_acquire_block_ntot/ ls
Performance counter stats for 'CPU(s) 0':
300 sifive_pl2_pmu/inner_acquire_block_btot/
17801 sifive_pl2_pmu/inner_acquire_block_ntob/
5253 sifive_pl2_pmu/inner_acquire_block_ntot/
0.088917326 seconds time elapsed
$ perf stat -C 0 -e /sifive_pl2_pmu/event=0x10001/
-e /sifive_pl2_pmu/event=0x4001/
-e /sifive_pl2_pmu/event=0x8001/ ls
Performance counter stats for 'CPU(s) 0':
251 sifive_pl2_pmu/event=0x10001/
2620 sifive_pl2_pmu/event=0x4001/
644 sifive_pl2_pmu/event=0x8001/
0.092827110 seconds time elapsed
Signed-off-by: Greentime Hu <greentime.hu@xxxxxxxxxx>
Co-developed-by: Eric Lin <eric.lin@xxxxxxxxxx>
Signed-off-by: Eric Lin <eric.lin@xxxxxxxxxx>
Reviewed-by: Zong Li <zong.li@xxxxxxxxxx>
Reviewed-by: Nick Hu <nick.hu@xxxxxxxxxx>
---
drivers/perf/Kconfig | 10 +
drivers/perf/Makefile | 1 +
drivers/perf/sifive_pl2_pmu.c | 602 ++++++++++++++++++++++++++
drivers/soc/sifive/sifive_pl2.h | 2 +
drivers/soc/sifive/sifive_pl2_cache.c | 10 +-
5 files changed, 624 insertions(+), 1 deletion(-)
create mode 100644 drivers/perf/sifive_pl2_pmu.c
diff --git a/drivers/perf/Kconfig b/drivers/perf/Kconfig
index f4572a5cca72..d6245122ffb2 100644
--- a/drivers/perf/Kconfig
+++ b/drivers/perf/Kconfig
@@ -234,4 +234,14 @@ config CXL_PMU
If unsure say 'm'.
+config SIFIVE_PL2_PMU
+ bool "Sifive private L2 Cache PMU"
+ depends on SIFIVE_PL2 && PERF_EVENTS
+ default y
+ help
+ Support for the private L2 cache controller performance monitor unit
+ (PMU) on SiFive platforms. The SiFive private L2 PMU can monitor the
+ each hart L2 cache performance and it consists of a set of event
+ programmable counters and their event selector registers.
+
endmenu
diff --git a/drivers/perf/Makefile b/drivers/perf/Makefile
index 16b3ec4db916..3141782dbfc9 100644
--- a/drivers/perf/Makefile
+++ b/drivers/perf/Makefile
@@ -26,3 +26,4 @@ obj-$(CONFIG_ALIBABA_UNCORE_DRW_PMU) += alibaba_uncore_drw_pmu.o
obj-$(CONFIG_ARM_CORESIGHT_PMU_ARCH_SYSTEM_PMU) += arm_cspmu/
obj-$(CONFIG_MESON_DDR_PMU) += amlogic/
obj-$(CONFIG_CXL_PMU) += cxl_pmu.o
+obj-$(CONFIG_SIFIVE_PL2_PMU) += sifive_pl2_pmu.o
diff --git a/drivers/perf/sifive_pl2_pmu.c b/drivers/perf/sifive_pl2_pmu.c
new file mode 100644
index 000000000000..bbdc006f0c8d
--- /dev/null
+++ b/drivers/perf/sifive_pl2_pmu.c
@@ -0,0 +1,602 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * SiFive private L2 cache controller PMU Driver
+ *
+ * Copyright (C) 2018-2023 SiFive, Inc.
+ */
+
+#define pr_fmt(fmt) "pL2CACHE_PMU: " fmt
+
+#include <linux/kprobes.h>
+#include <linux/kernel.h>
+#include <linux/kdebug.h>
+#include <linux/mutex.h>
+#include <linux/bitmap.h>
+#include <linux/perf_event.h>
+#include <linux/atomic.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/cpu_pm.h>
+
+#define SIFIVE_PL2_PMU_MAX_COUNTERS 64
+#define SIFIVE_PL2_SELECT_BASE_OFFSET 0x2000
+#define SIFIVE_PL2_COUNTER_BASE_OFFSET 0x3000
+
+#define SIFIVE_PL2_COUNTER_MASK GENMASK_ULL(63, 0)
+
+struct sifive_pl2_pmu_event {
+ struct perf_event **events;
+ void __iomem *event_counter_base;
+ void __iomem *event_select_base;
+ u32 counters;
+ DECLARE_BITMAP(used_mask, SIFIVE_PL2_PMU_MAX_COUNTERS);
+};
+
+struct sifive_pl2_pmu {
+ struct pmu *pmu;
+};
+
+static bool pl2pmu_init_done;
+static struct sifive_pl2_pmu sifive_pl2_pmu;
+static DEFINE_PER_CPU(struct sifive_pl2_pmu_event, sifive_pl2_pmu_event);
+
+#ifndef readq
+static inline unsigned long long readq(void __iomem *addr)
+{
+ return readl(addr) | (((unsigned long long)readl(addr + 4)) << 32LL);
+}
+#endif
+
+#ifndef writeq
+static inline void writeq(unsigned long long v, void __iomem *addr)
+{
+ writel(lower_32_bits(v), addr);
+ writel(upper_32_bits(v), addr + 4);
+}
+#endif
+
+/* formats */
+static ssize_t sifive_pl2_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 sysfs_emit(buf, "%s\n", (char *)eattr->var);
+}
+
+#define SIFIVE_PL2_PMU_PMU_FORMAT_ATTR(_name, _config) \
+ (&((struct dev_ext_attribute[]) { \
+ { .attr = __ATTR(_name, 0444, sifive_pl2_pmu_format_show, NULL),\
+ .var = (void *)_config, } \
+ })[0].attr.attr)
+
+static struct attribute *sifive_pl2_pmu_formats[] = {
+ SIFIVE_PL2_PMU_PMU_FORMAT_ATTR(event, "config:0-63"),
+ NULL,
+};
+
+static struct attribute_group sifive_pl2_pmu_format_group = {
+ .name = "format",
+ .attrs = sifive_pl2_pmu_formats,
+};
+
+/* events */
+
+static ssize_t sifive_pl2_pmu_event_show(struct device *dev,
+ struct device_attribute *attr,
+ char *page)
+{
+ struct perf_pmu_events_attr *pmu_attr;
+
+ pmu_attr = container_of(attr, struct perf_pmu_events_attr, attr);
+ return sysfs_emit(page, "event=0x%02llx\n", pmu_attr->id);
+}
+
+#define SET_EVENT_SELECT(_event, _set) (((u64)1 << ((_event) + 8)) | (_set))
+#define PL2_PMU_EVENT_ATTR(_name, _event, _set) \
+ PMU_EVENT_ATTR_ID(_name, sifive_pl2_pmu_event_show, \
+ SET_EVENT_SELECT(_event, _set))
+
+enum pl2_pmu_event_set1 {
+ INNER_PUT_FULL_DATA = 0,
+ INNER_PUT_PARTIAL_DATA,
+ INNER_ARITHMETIC_DATA,
+ INNER_GET,
+ INNER_PREFETCH_READ,
+ INNER_PREFETCH_WRITE,
+ INNER_ACQUIRE_BLOCK_NTOB,
+ INNER_ACQUIRE_BLOCK_NTOT,
+ INNER_ACQUIRE_BLOCK_BTOT,
+ INNER_ACQUIRE_PERM_NTOT,
+ INNER_ACQUIRE_PERM_BTOT,
+ INNER_RELEASE_TTOB,
+ INNER_RELEASE_TTON,
+ INNER_RELEASE_BTON,
+ INNER_RELEASE_DATA_TTOB,
+ INNER_RELEASE_DATA_TTON,
+ INNER_RELEASE_DATA_BTON,
+ INNER_RELEASE_DATA_TTOT,
+ INNER_PROBE_BLOCK_TOT,
+ INNER_PROBE_BLOCK_TOB,
+ INNER_PROBE_BLOCK_TON,
+ INNER_PROBE_PERM_TON,
+ INNER_PROBE_ACK_TTOB,
+ INNER_PROBE_ACK_TTON,
+ INNER_PROBE_ACK_BTON,
+ INNER_PROBE_ACK_TTOT,
+ INNER_PROBE_ACK_BTOB,
+ INNER_PROBE_ACK_NTON,
+ INNER_PROBE_ACK_DATA_TTOB,
+ INNER_PROBE_ACK_DATA_TTON,
+ INNER_PROBE_ACK_DATA_TTOT,
+ PL2_PMU_MAX_EVENT1_IDX
+};
+
+enum pl2_pmu_event_set2 {
+ INNER_PUT_FULL_DATA_HIT = 0,
+ INNER_PUT_PARTIAL_DATA_HIT,
+ INNER_ARITHMETIC_DATA_HIT,
+ INNER_GET_HIT,
+ INNER_PREFETCH_READ_HIT,
+ INNER_ACQUIRE_BLOCK_NTOB_HIT,
+ INNER_ACQUIRE_PERM_NTOT_HIT,
+ INNER_RELEASE_TTOB_HIT,
+ INNER_RELEASE_DATA_TTOB_HIT,
+ OUTER_PROBE_BLOCK_TOT_HIT,
+ INNER_PUT_FULL_DATA_HIT_SHARED,
+ INNER_PUT_PARTIAL_DATA_HIT_SHARED,
+ INNER_ARITHMETIC_DATA_HIT_SHARED,
+ INNER_GET_HIT_SHARED,
+ INNER_PREFETCH_READ_HIT_SHARED,
+ INNER_ACQUIRE_BLOCK_HIT_SHARED,
+ INNER_ACQUIRE_PERM_NTOT_HIT_SHARED,
+ OUTER_PROBE_BLOCK_TOT_HIT_SHARED,
+ OUTER_PROBE_BLOCK_TOT_HIT_DIRTY,
+ PL2_PMU_MAX_EVENT2_IDX
+};
+
+enum pl2_pmu_event_set3 {
+ OUTER_PUT_FULL_DATA = 0,
+ OUTER_PUT_PARTIAL_DATA,
+ OUTER_ARITHMETIC_DATA,
+ OUTER_GET,
+ OUTER_PREFETCH_READ,
+ OUTER_PREFETCH_WRITE,
+ OUTER_ACQUIRE_BLOCK_NTOB,
+ OUTER_ACQUIRE_BLOCK_NTOT,
+ OUTER_ACQUIRE_BLOCK_BTOT,
+ OUTER_ACQUIRE_PERM_NTOT,
+ OUTER_ACQUIRE_PERM_BTOT,
+ OUTER_RELEARE_TTOB,
+ OUTER_RELEARE_TTON,
+ OUTER_RELEARE_BTON,
+ OUTER_RELEARE_DATA_TTOB,
+ OUTER_RELEARE_DATA_TTON,
+ OUTER_RELEARE_DATA_BTON,
+ OUTER_RELEARE_DATA_TTOT,
+ OUTER_PROBE_BLOCK_TOT,
+ OUTER_PROBE_BLOCK_TOB,
+ OUTER_PROBE_BLOCK_TON,
+ OUTER_PROBE_PERM_TON,
+ OUTER_PROBE_ACK_TTOB,
+ OUTER_PROBE_ACK_TTON,
+ OUTER_PROBE_ACK_BTON,
+ OUTER_PROBE_ACK_TTOT,
+ OUTER_PROBE_ACK_BTOB,
+ OUTER_PROBE_ACK_NTON,
+ OUTER_PROBE_ACK_DATA_TTOB,
+ OUTER_PROBE_ACK_DATA_TTON,
+ OUTER_PROBE_ACK_DATA_TTOT,
+ PL2_PMU_MAX_EVENT3_IDX
+};
+
+enum pl2_pmu_event_set4 {
+ INNER_HINT_HITS_MSHR = 0,
+ INNER_READ_HITS_MSHR,
+ INNER_WRITE_HITS_MSHR,
+ INNER_READ_REPLAY,
+ INNER_WRITE_REPLAY,
+ OUTER_PROBE_REPLAY,
+ PL2_PMU_MAX_EVENT4_IDX
+};
+
+static struct attribute *sifive_pl2_pmu_events[] = {
+ PL2_PMU_EVENT_ATTR(inner_put_full_data, INNER_PUT_FULL_DATA, 1),
+ PL2_PMU_EVENT_ATTR(inner_put_partial_data, INNER_PUT_PARTIAL_DATA, 1),
+ PL2_PMU_EVENT_ATTR(inner_arithmetic_data, INNER_ARITHMETIC_DATA, 1),
+ PL2_PMU_EVENT_ATTR(inner_get, INNER_GET, 1),
+ PL2_PMU_EVENT_ATTR(inner_prefetch_read, INNER_PREFETCH_READ, 1),
+ PL2_PMU_EVENT_ATTR(inner_prefetch_write, INNER_PREFETCH_WRITE, 1),
+ PL2_PMU_EVENT_ATTR(inner_acquire_block_ntob, INNER_ACQUIRE_BLOCK_NTOB, 1),
+ PL2_PMU_EVENT_ATTR(inner_acquire_block_ntot, INNER_ACQUIRE_BLOCK_NTOT, 1),
+ PL2_PMU_EVENT_ATTR(inner_acquire_block_btot, INNER_ACQUIRE_BLOCK_BTOT, 1),
+ PL2_PMU_EVENT_ATTR(inner_acquire_perm_ntot, INNER_ACQUIRE_PERM_NTOT, 1),
+ PL2_PMU_EVENT_ATTR(inner_acquire_perm_btot, INNER_ACQUIRE_PERM_BTOT, 1),
+ PL2_PMU_EVENT_ATTR(inner_release_ttob, INNER_RELEASE_TTOB, 1),
+ PL2_PMU_EVENT_ATTR(inner_release_tton, INNER_RELEASE_TTON, 1),
+ PL2_PMU_EVENT_ATTR(inner_release_bton, INNER_RELEASE_BTON, 1),
+ PL2_PMU_EVENT_ATTR(inner_release_data_ttob, INNER_RELEASE_DATA_TTOB, 1),
+ PL2_PMU_EVENT_ATTR(inner_release_data_tton, INNER_RELEASE_DATA_TTON, 1),
+ PL2_PMU_EVENT_ATTR(inner_release_data_bton, INNER_RELEASE_DATA_BTON, 1),
+ PL2_PMU_EVENT_ATTR(inner_release_data_ttot, INNER_RELEASE_DATA_TTOT, 1),
+ PL2_PMU_EVENT_ATTR(inner_probe_block_tot, INNER_PROBE_BLOCK_TOT, 1),
+ PL2_PMU_EVENT_ATTR(inner_probe_block_tob, INNER_PROBE_BLOCK_TOB, 1),
+ PL2_PMU_EVENT_ATTR(inner_probe_block_ton, INNER_PROBE_BLOCK_TON, 1),
+ PL2_PMU_EVENT_ATTR(inner_probe_perm_ton, INNER_PROBE_PERM_TON, 1),
+ PL2_PMU_EVENT_ATTR(inner_probe_ack_ttob, INNER_PROBE_ACK_TTOB, 1),
+ PL2_PMU_EVENT_ATTR(inner_probe_ack_tton, INNER_PROBE_ACK_TTON, 1),
+ PL2_PMU_EVENT_ATTR(inner_probe_ack_bton, INNER_PROBE_ACK_BTON, 1),
+ PL2_PMU_EVENT_ATTR(inner_probe_ack_ttot, INNER_PROBE_ACK_TTOT, 1),
+ PL2_PMU_EVENT_ATTR(inner_probe_ack_btob, INNER_PROBE_ACK_BTOB, 1),
+ PL2_PMU_EVENT_ATTR(inner_probe_ack_nton, INNER_PROBE_ACK_NTON, 1),
+ PL2_PMU_EVENT_ATTR(inner_probe_ack_data_ttob, INNER_PROBE_ACK_DATA_TTOB, 1),
+ PL2_PMU_EVENT_ATTR(inner_probe_ack_data_tton, INNER_PROBE_ACK_DATA_TTON, 1),
+ PL2_PMU_EVENT_ATTR(inner_probe_ack_data_ttot, INNER_PROBE_ACK_DATA_TTOT, 1),
+
+ PL2_PMU_EVENT_ATTR(inner_put_full_data_hit, INNER_PUT_FULL_DATA_HIT, 2),
+ PL2_PMU_EVENT_ATTR(inner_put_partial_data_hit, INNER_PUT_PARTIAL_DATA_HIT, 2),
+ PL2_PMU_EVENT_ATTR(inner_arithmetic_data_hit, INNER_ARITHMETIC_DATA_HIT, 2),
+ PL2_PMU_EVENT_ATTR(inner_get_hit, INNER_GET_HIT, 2),
+ PL2_PMU_EVENT_ATTR(inner_prefetch_read_hit, INNER_PREFETCH_READ_HIT, 2),
+ PL2_PMU_EVENT_ATTR(inner_acquire_block_ntob_hit, INNER_ACQUIRE_BLOCK_NTOB_HIT, 2),
+ PL2_PMU_EVENT_ATTR(inner_acquire_perm_ntot_hit, INNER_ACQUIRE_PERM_NTOT_HIT, 2),
+ PL2_PMU_EVENT_ATTR(inner_release_ttob_hit, INNER_RELEASE_TTOB_HIT, 2),
+ PL2_PMU_EVENT_ATTR(inner_release_data_ttob_hit, INNER_RELEASE_DATA_TTOB_HIT, 2),
+ PL2_PMU_EVENT_ATTR(outer_probe_block_tot_hit, OUTER_PROBE_BLOCK_TOT_HIT, 2),
+ PL2_PMU_EVENT_ATTR(inner_put_full_data_hit_shared, INNER_PUT_FULL_DATA_HIT_SHARED, 2),
+ PL2_PMU_EVENT_ATTR(inner_put_partial_data_hit_shared, INNER_PUT_PARTIAL_DATA_HIT_SHARED, 2),
+ PL2_PMU_EVENT_ATTR(inner_arithmetic_data_hit_shared, INNER_ARITHMETIC_DATA_HIT_SHARED, 2),
+ PL2_PMU_EVENT_ATTR(inner_get_hit_shared, INNER_GET_HIT_SHARED, 2),
+ PL2_PMU_EVENT_ATTR(inner_prefetch_read_hit_shared, INNER_PREFETCH_READ_HIT_SHARED, 2),
+ PL2_PMU_EVENT_ATTR(inner_acquire_block_hit_shared, INNER_ACQUIRE_BLOCK_HIT_SHARED, 2),
+ PL2_PMU_EVENT_ATTR(inner_acquire_perm_hit_shared, INNER_ACQUIRE_PERM_NTOT_HIT_SHARED, 2),
+ PL2_PMU_EVENT_ATTR(outer_probe_block_tot_hit_shared, OUTER_PROBE_BLOCK_TOT_HIT_SHARED, 2),
+ PL2_PMU_EVENT_ATTR(outer_probe_block_tot_hit_dirty, OUTER_PROBE_BLOCK_TOT_HIT_DIRTY, 2),
+
+ PL2_PMU_EVENT_ATTR(outer_put_full_data, OUTER_PUT_FULL_DATA, 3),
+ PL2_PMU_EVENT_ATTR(outer_put_partial_data, OUTER_PUT_PARTIAL_DATA, 3),
+ PL2_PMU_EVENT_ATTR(outer_arithmetic_data, OUTER_ARITHMETIC_DATA, 3),
+ PL2_PMU_EVENT_ATTR(outer_get, OUTER_GET, 3),
+ PL2_PMU_EVENT_ATTR(outer_prefetch_read, OUTER_PREFETCH_READ, 3),
+ PL2_PMU_EVENT_ATTR(outer_prefetch_write, OUTER_PREFETCH_WRITE, 3),
+ PL2_PMU_EVENT_ATTR(outer_acquire_block_ntob, OUTER_ACQUIRE_BLOCK_NTOB, 3),
+ PL2_PMU_EVENT_ATTR(outer_acquire_block_ntot, OUTER_ACQUIRE_BLOCK_NTOT, 3),
+ PL2_PMU_EVENT_ATTR(outer_acquire_block_btot, OUTER_ACQUIRE_BLOCK_BTOT, 3),
+ PL2_PMU_EVENT_ATTR(outer_acquire_perm_ntot, OUTER_ACQUIRE_PERM_NTOT, 3),
+ PL2_PMU_EVENT_ATTR(outer_acquire_perm_btot, OUTER_ACQUIRE_PERM_BTOT, 3),
+ PL2_PMU_EVENT_ATTR(outer_release_ttob, OUTER_RELEARE_TTOB, 3),
+ PL2_PMU_EVENT_ATTR(outer_release_tton, OUTER_RELEARE_TTON, 3),
+ PL2_PMU_EVENT_ATTR(outer_release_bton, OUTER_RELEARE_BTON, 3),
+ PL2_PMU_EVENT_ATTR(outer_release_data_ttob, OUTER_RELEARE_DATA_TTOB, 3),
+ PL2_PMU_EVENT_ATTR(outer_release_data_tton, OUTER_RELEARE_DATA_TTON, 3),
+ PL2_PMU_EVENT_ATTR(outer_release_data_bton, OUTER_RELEARE_DATA_BTON, 3),
+ PL2_PMU_EVENT_ATTR(outer_release_data_ttot, OUTER_RELEARE_DATA_TTOT, 3),
+ PL2_PMU_EVENT_ATTR(outer_probe_block_tot, OUTER_PROBE_BLOCK_TOT, 3),
+ PL2_PMU_EVENT_ATTR(outer_probe_block_tob, OUTER_PROBE_BLOCK_TOB, 3),
+ PL2_PMU_EVENT_ATTR(outer_probe_block_ton, OUTER_PROBE_BLOCK_TON, 3),
+ PL2_PMU_EVENT_ATTR(outer_probe_perm_ton, OUTER_PROBE_PERM_TON, 3),
+ PL2_PMU_EVENT_ATTR(outer_probe_ack_ttob, OUTER_PROBE_ACK_TTOB, 3),
+ PL2_PMU_EVENT_ATTR(outer_probe_ack_tton, OUTER_PROBE_ACK_TTON, 3),
+ PL2_PMU_EVENT_ATTR(outer_probe_ack_bton, OUTER_PROBE_ACK_BTON, 3),
+ PL2_PMU_EVENT_ATTR(outer_probe_ack_ttot, OUTER_PROBE_ACK_TTOT, 3),
+ PL2_PMU_EVENT_ATTR(outer_probe_ack_btob, OUTER_PROBE_ACK_BTOB, 3),
+ PL2_PMU_EVENT_ATTR(outer_probe_ack_nton, OUTER_PROBE_ACK_NTON, 3),
+ PL2_PMU_EVENT_ATTR(outer_probe_ack_data_ttob, OUTER_PROBE_ACK_DATA_TTOB, 3),
+ PL2_PMU_EVENT_ATTR(outer_probe_ack_data_tton, OUTER_PROBE_ACK_DATA_TTON, 3),
+ PL2_PMU_EVENT_ATTR(outer_probe_ack_data_ttot, OUTER_PROBE_ACK_DATA_TTOT, 3),
+
+ PL2_PMU_EVENT_ATTR(inner_hint_hits_mshr, INNER_HINT_HITS_MSHR, 4),
+ PL2_PMU_EVENT_ATTR(inner_read_hits_mshr, INNER_READ_HITS_MSHR, 4),
+ PL2_PMU_EVENT_ATTR(inner_write_hits_mshr, INNER_WRITE_HITS_MSHR, 4),
+ PL2_PMU_EVENT_ATTR(inner_read_replay, INNER_READ_REPLAY, 4),
+ PL2_PMU_EVENT_ATTR(inner_write_replay, INNER_WRITE_REPLAY, 4),
+ PL2_PMU_EVENT_ATTR(outer_probe_replay, OUTER_PROBE_REPLAY, 4),
+ NULL
+};
+
+static struct attribute_group sifive_pl2_pmu_events_group = {
+ .name = "events",
+ .attrs = sifive_pl2_pmu_events,
+};
+
+/*
+ * Per PMU device attribute groups
+ */
+
+static const struct attribute_group *sifive_pl2_pmu_attr_grps[] = {
+ &sifive_pl2_pmu_format_group,
+ &sifive_pl2_pmu_events_group,
+ NULL,
+};
+
+/*
+ * Low-level functions: reading and writing counters
+ */
+
+static inline u64 read_counter(int idx)
+{
+ struct sifive_pl2_pmu_event *ptr = this_cpu_ptr(&sifive_pl2_pmu_event);
+
+ if (WARN_ON_ONCE(idx < 0 || idx > ptr->counters))
+ return -EINVAL;
+
+ return readq(ptr->event_counter_base + idx * 8);
+}
+
+static inline void write_counter(int idx, u64 val)
+{
+ struct sifive_pl2_pmu_event *ptr = this_cpu_ptr(&sifive_pl2_pmu_event);
+
+ writeq(val, ptr->event_counter_base + idx * 8);
+}
+
+/*
+ * pmu->read: read and update the counter
+ */
+static void sifive_pl2_pmu_read(struct perf_event *event)
+{
+ struct hw_perf_event *hwc = &event->hw;
+ u64 prev_raw_count, new_raw_count;
+ u64 oldval;
+ int idx = hwc->idx;
+ u64 delta;
+
+ do {
+ prev_raw_count = local64_read(&hwc->prev_count);
+ new_raw_count = read_counter(idx);
+
+ oldval = local64_cmpxchg(&hwc->prev_count, prev_raw_count,
+ new_raw_count);
+ } while (oldval != prev_raw_count);
+
+ /* delta is the value to update the counter we maintain in the kernel. */
+ delta = (new_raw_count - prev_raw_count) & SIFIVE_PL2_COUNTER_MASK;
+ local64_add(delta, &event->count);
+}
+
+/*
+ * State transition functions:
+ *
+ * stop()/start() & add()/del()
+ */
+
+/*
+ * pmu->stop: stop the counter
+ */
+static void sifive_pl2_pmu_stop(struct perf_event *event, int flags)
+{
+ struct hw_perf_event *hwc = &event->hw;
+ struct sifive_pl2_pmu_event *ptr = this_cpu_ptr(&sifive_pl2_pmu_event);
+
+ /* Disable this counter to count events */
+ writeq(0, ptr->event_select_base + (hwc->idx * 8));
+
+ WARN_ON_ONCE(hwc->state & PERF_HES_STOPPED);
+ hwc->state |= PERF_HES_STOPPED;
+
+ if ((flags & PERF_EF_UPDATE) && !(hwc->state & PERF_HES_UPTODATE)) {
+ sifive_pl2_pmu_read(event);
+ hwc->state |= PERF_HES_UPTODATE;
+ }
+}
+
+/*
+ * pmu->start: start the event.
+ */
+static void sifive_pl2_pmu_start(struct perf_event *event, int flags)
+{
+ struct hw_perf_event *hwc = &event->hw;
+ struct sifive_pl2_pmu_event *ptr = this_cpu_ptr(&sifive_pl2_pmu_event);
+
+ if (WARN_ON_ONCE(!(event->hw.state & PERF_HES_STOPPED)))
+ return;
+
+ if (flags & PERF_EF_RELOAD)
+ WARN_ON_ONCE(!(event->hw.state & PERF_HES_UPTODATE));
+
+ hwc->state = 0;
+ perf_event_update_userpage(event);
+
+ /* Set initial value 0 */
+ local64_set(&hwc->prev_count, 0);
+ write_counter(hwc->idx, 0);
+
+ /* Enable counter to count these events */
+ writeq(hwc->config, ptr->event_select_base + (hwc->idx * 8));
+}
+
+/*
+ * pmu->add: add the event to PMU.
+ */
+static int sifive_pl2_pmu_add(struct perf_event *event, int flags)
+{
+ struct hw_perf_event *hwc = &event->hw;
+ struct sifive_pl2_pmu_event *ptr = this_cpu_ptr(&sifive_pl2_pmu_event);
+ int idx;
+ u64 config = event->attr.config;
+ u64 set = config & 0xff;
+ u64 ev_type = config >> 8;
+
+ /* Check if this is a valid set and event. */
+ switch (set) {
+ case 1:
+ if (ev_type >= (BIT_ULL(PL2_PMU_MAX_EVENT1_IDX)))
+ return -ENOENT;
+ break;
+ case 2:
+ if (ev_type >= (BIT_ULL(PL2_PMU_MAX_EVENT2_IDX)))
+ return -ENOENT;
+ break;
+ case 3:
+ if (ev_type >= (BIT_ULL(PL2_PMU_MAX_EVENT3_IDX)))
+ return -ENOENT;
+ break;
+ case 4:
+ if (ev_type >= (BIT_ULL(PL2_PMU_MAX_EVENT4_IDX)))
+ return -ENOENT;
+ break;
+ case 0:
+ default:
+ return -ENOENT;
+ }
+
+ idx = find_first_zero_bit(ptr->used_mask, ptr->counters);
+ /* The counters are all in use. */
+ if (idx == ptr->counters)
+ return -EAGAIN;
+
+ set_bit(idx, ptr->used_mask);
+
+ /* Found an available counter idx for this event. */
+ hwc->idx = idx;
+ ptr->events[hwc->idx] = event;
+
+ hwc->state = PERF_HES_UPTODATE | PERF_HES_STOPPED;
+
+ if (flags & PERF_EF_START)
+ sifive_pl2_pmu_start(event, PERF_EF_RELOAD);
+
+ perf_event_update_userpage(event);
+ return 0;
+}
+
+/*
+ * pmu->del: delete the event from PMU.
+ */
+static void sifive_pl2_pmu_del(struct perf_event *event, int flags)
+{
+ struct sifive_pl2_pmu_event *ptr = this_cpu_ptr(&sifive_pl2_pmu_event);
+ struct hw_perf_event *hwc = &event->hw;
+
+ /* Stop the counter and release this counter. */
+ ptr->events[hwc->idx] = NULL;
+ sifive_pl2_pmu_stop(event, PERF_EF_UPDATE);
+ clear_bit(hwc->idx, ptr->used_mask);
+ perf_event_update_userpage(event);
+}
+
+/*
+ * Event Initialization/Finalization
+ */
+
+static int sifive_pl2_pmu_event_init(struct perf_event *event)
+{
+ struct hw_perf_event *hwc = &event->hw;
+
+ /* Don't allocate hw counter yet. */
+ hwc->idx = -1;
+ hwc->config = event->attr.config;
+
+ return 0;
+}
+
+/*
+ * Initialization
+ */
+
+static struct pmu sifive_pl2_generic_pmu = {
+ .name = "sifive_pl2_pmu",
+ .task_ctx_nr = perf_sw_context,
+ .event_init = sifive_pl2_pmu_event_init,
+ .add = sifive_pl2_pmu_add,
+ .del = sifive_pl2_pmu_del,
+ .start = sifive_pl2_pmu_start,
+ .stop = sifive_pl2_pmu_stop,
+ .read = sifive_pl2_pmu_read,
+ .attr_groups = sifive_pl2_pmu_attr_grps,
+ .capabilities = PERF_PMU_CAP_NO_EXCLUDE | PERF_PMU_CAP_NO_INTERRUPT,
+};
+
+static struct sifive_pl2_pmu sifive_pl2_pmu = {
+ .pmu = &sifive_pl2_generic_pmu,
+};
+
+/*
+ * PM notifer for suspend to ram
+ */
+#ifdef CONFIG_CPU_PM
+static int sifive_pl2_pmu_pm_notify(struct notifier_block *b, unsigned long cmd,
+ void *v)
+{
+ struct sifive_pl2_pmu_event *ptr = this_cpu_ptr(&sifive_pl2_pmu_event);
+ struct perf_event *event;
+ int idx;
+ int enabled_event = bitmap_weight(ptr->used_mask, ptr->counters);
+
+ if (!enabled_event)
+ return NOTIFY_OK;
+
+ for (idx = 0; idx < ptr->counters; idx++) {
+ event = ptr->events[idx];
+ if (!event)
+ continue;
+
+ switch (cmd) {
+ case CPU_PM_ENTER:
+ /* Stop and update the counter */
+ sifive_pl2_pmu_stop(event, PERF_EF_UPDATE);
+ break;
+ case CPU_PM_ENTER_FAILED:
+ case CPU_PM_EXIT:
+ /* Restore and enable the counter */
+ sifive_pl2_pmu_start(event, PERF_EF_RELOAD);
+ break;
+ default:
+ break;
+ }
+ }
+
+ return NOTIFY_OK;
+}
+
+static struct notifier_block sifive_pl2_pmu_pm_notifier_block = {
+ .notifier_call = sifive_pl2_pmu_pm_notify,
+};
+
+static inline void sifive_pl2_pmu_pm_init(void)
+{
+ cpu_pm_register_notifier(&sifive_pl2_pmu_pm_notifier_block);
+}
+
+#else
+static inline void sifive_pl2_pmu_pm_init(void) { }
+#endif /* CONFIG_CPU_PM */
+
+int sifive_pl2_pmu_probe(struct device_node *pl2_node,
+ void __iomem *pl2_base, int cpu)
+{
+ struct sifive_pl2_pmu_event *ptr = per_cpu_ptr(&sifive_pl2_pmu_event, cpu);
+ int ret;
+
+ /* Get counter numbers. */
+ ret = of_property_read_u32(pl2_node, "sifive,perfmon-counters", &ptr->counters);
+ if (ret) {
+ pr_err("Not found sifive,perfmon-counters property\n");
+ return -EINVAL;
+ }
+ pr_info("perfmon-counters: %d for CPU %d\n", ptr->counters, cpu);
+
+ /* Allocate perf_event. */
+ ptr->events = kcalloc(ptr->counters, sizeof(struct perf_event), GFP_KERNEL);
+ if (!ptr->events)
+ return -ENOMEM;
+
+ ptr->event_select_base = pl2_base + SIFIVE_PL2_SELECT_BASE_OFFSET;
+ ptr->event_counter_base = pl2_base + SIFIVE_PL2_COUNTER_BASE_OFFSET;
+
+ if (!pl2pmu_init_done) {
+ ret = perf_pmu_register(sifive_pl2_pmu.pmu, sifive_pl2_pmu.pmu->name, -1);
+ if (ret) {
+ pr_err("Failed to register sifive_pl2_pmu.pmu: %d\n", ret);
+ return ret;
+ }
+ sifive_pl2_pmu_pm_init();
+ pl2pmu_init_done = true;
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL(sifive_pl2_pmu_probe);
diff --git a/drivers/soc/sifive/sifive_pl2.h b/drivers/soc/sifive/sifive_pl2.h
index 9a5c9ee898bd..bc7e5f1da6e6 100644
--- a/drivers/soc/sifive/sifive_pl2.h
+++ b/drivers/soc/sifive/sifive_pl2.h
@@ -24,4 +24,6 @@ struct sifive_pl2_state {
u64 pmclientfilter;
};
+int sifive_pl2_pmu_probe(struct device_node *pl2_node,
+ void __iomem *pl2_base, int cpu);
#endif /*_SIFIVE_PL2_H */
diff --git a/drivers/soc/sifive/sifive_pl2_cache.c b/drivers/soc/sifive/sifive_pl2_cache.c
index da2dc0eead74..1b9088e1766b 100644
--- a/drivers/soc/sifive/sifive_pl2_cache.c
+++ b/drivers/soc/sifive/sifive_pl2_cache.c
@@ -126,7 +126,7 @@ static int sifive_pl2_cache_dev_probe(struct platform_device *pdev)
struct sifive_pl2_state *pl2_state = NULL;
struct resource *res;
void __iomem *pl2_base;
- int cpu;
+ int cpu, ret;
/* Traverse all cpu nodes to find the one mapping to its pl2 node. */
for_each_cpu(cpu, cpu_possible_mask) {
@@ -155,6 +155,14 @@ static int sifive_pl2_cache_dev_probe(struct platform_device *pdev)
pl2_config_read(pl2_base, cpu);
pl2_state->pl2_base = pl2_base;
+ if (IS_ENABLED(CONFIG_SIFIVE_PL2_PMU)) {
+ ret = sifive_pl2_pmu_probe(pl2_node, pl2_base, cpu);
+ if (ret) {
+ pr_err("Failed to probe sifive_pl2_pmu driver.\n");
+ return -EINVAL;
+ }
+ }
+
return 0;
}
--
2.40.1
