From e287be87b59e18fd4b32f5d2cf56bbccf6c1a711 Mon Sep 17 00:00:00 2001 From: Tuan Phan Date: Tue, 20 Aug 2019 08:14:38 -0700 Subject: [PATCH] perf: Add ARM DMC-620 PMU driver. This driver supports ARM DMC-620 PMU which does not have Ampere's specific code besides ACPI ID. To display list of events, do perf list and look at belongs to dmc620_x where x is the MCU ID in the system. Example: #perf stat -e dmc620_0/clk_cycle_count/ -C 0 Get perf event for clk_cycle_count counter of MCU 0. Note that above command use "-C 0" to prevent perf rotate events in all CPUs. DMC620 counters are global and not depend on any CPU. CPU 0 is used at it is always on in default configuration. #perf stat -e dmc620_0/clkdiv2_allocate,mask=0x1f,match=0x2f, incr=2,invert=1/ -C 0 The above example shows how to specify mask, match, incr, invert parameters in any counters. Signed-off-by: Tuan Phan --- drivers/perf/Kconfig | 7 + drivers/perf/Makefile | 1 + drivers/perf/arm_dmc620_pmu.c | 820 ++++++++++++++++++++++++++++++++++ 3 files changed, 828 insertions(+) create mode 100644 drivers/perf/arm_dmc620_pmu.c diff --git a/drivers/perf/Kconfig b/drivers/perf/Kconfig index 399b13e33..f732c556e 100644 --- a/drivers/perf/Kconfig +++ b/drivers/perf/Kconfig @@ -109,4 +109,11 @@ config ARM_SPE_PMU Extension, which provides periodic sampling of operations in the CPU pipeline and reports this via the perf AUX interface. +config ARM_DMC620_PMU + bool "Enable support for the DMC-620 PMU" + depends on ARM64 && ACPI + default n + help + Enable perf support for the DMC-620 PMU. + endmenu diff --git a/drivers/perf/Makefile b/drivers/perf/Makefile index 7cd376583..0d42ace8a 100644 --- a/drivers/perf/Makefile +++ b/drivers/perf/Makefile @@ -10,3 +10,4 @@ obj-$(CONFIG_QCOM_L2_PMU) += qcom_l2_pmu.o obj-$(CONFIG_QCOM_L3_PMU) += qcom_l3_pmu.o obj-$(CONFIG_XGENE_PMU) += xgene_pmu.o obj-$(CONFIG_ARM_SPE_PMU) += arm_spe_pmu.o +obj-$(CONFIG_ARM_DMC620_PMU) += arm_dmc620_pmu.o diff --git a/drivers/perf/arm_dmc620_pmu.c b/drivers/perf/arm_dmc620_pmu.c new file mode 100644 index 000000000..3a5b4346e --- /dev/null +++ b/drivers/perf/arm_dmc620_pmu.c @@ -0,0 +1,820 @@ +// SPDX-License-Identifier: GPL-2.0 +// Copyright (C) 2019 Ampere Computing LLC. +// Author: Tuan Phan + +#define PMUNAME "dmc620" +#define DRVNAME PMUNAME "_pmu" +#define pr_fmt(fmt) DRVNAME ": " fmt + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define DMC620_CNT_MAX_PERIOD 0xffffffff +#define DMC620_PMU_CLKDIV2_MAX_COUNTERS 8 +#define DMC620_PMU_CLK_MAX_COUNTERS 2 +#define DMC620_PMU_MAX_COUNTERS \ + (DMC620_PMU_CLKDIV2_MAX_COUNTERS + DMC620_PMU_CLK_MAX_COUNTERS) + +#define DMC620_PMU_OVERFLOW_STATUS_CLKDIV2_OFFSET 8 +#define DMC620_PMU_OVERFLOW_STATUS_CLKDIV2_MASK \ + (DMC620_PMU_CLKDIV2_MAX_COUNTERS - 1) +#define DMC620_PMU_OVERFLOW_STATUS_CLK_OFFSET 12 +#define DMC620_PMU_OVERFLOW_STATUS_CLK_MASK \ + (DMC620_PMU_CLK_MAX_COUNTERS - 1) +#define DMC620_PMU_COUNTERS_BASE_OFFSET 16 +#define DMC620_PMU_COUNTER_MASK_31_00_OFFSET 0 +#define DMC620_PMU_COUNTER_MASK_63_32_OFFSET 4 +#define DMC620_PMU_COUNTER_MATCH_31_00_OFFSET 8 +#define DMC620_PMU_COUNTER_MATCH_63_32_OFFSET 12 +#define DMC620_PMU_COUNTER_CONTROL_OFFSET 16 +#define DMC620_PMU_COUNTER_CONTROL_ENABLE_MASK BIT(0) +#define DMC620_PMU_COUNTER_CONTROL_INVERT_SHIFT 1 +#define DMC620_PMU_COUNTER_CONTROL_EVENT_MUX (((x)&0x1f)>>2) +#define DMC620_PMU_COUNTER_CONTROL_EVENT_MUX_SHIFT 2 +#define DMC620_PMU_COUNTER_CONTROL_INCR (((x)&0x1ff)>>7) +#define DMC620_PMU_COUNTER_CONTROL_INCR_SHIFT 7 +#define DMC620_PMU_COUNTER_SNAPSHOT_OFFSET 24 +#define DMC620_PMU_COUNTER_VALUE_OFFSET 32 +#define DMC620_PMU_COUNTER_REG_BYTE_LENGTH 40 + +#define DMC620_PMU_CLKDIV2_CYCLE_COUNT 0x0 +#define DMC620_PMU_CLKDIV2_ALLOCATE 0x1 +#define DMC620_PMU_CLKDIV2_QUEUE_DEPTH 0x2 +#define DMC620_PMU_CLKDIV2_WAITING_FOR_WR_DATA 0x3 +#define DMC620_PMU_CLKDIV2_READ_BACKLOG 0x4 +#define DMC620_PMU_CLKDIV2_WAITING_FOR_MI 0x5 +#define DMC620_PMU_CLKDIV2_HAZARD_RESOLUTION 0x6 +#define DMC620_PMU_CLKDIV2_ENQUEUE 0x7 +#define DMC620_PMU_CLKDIV2_ARBITRATE 0x8 +#define DMC620_PMU_CLKDIV2_LRANK_TURNAROUND_ACTIVATE 0x9 +#define DMC620_PMU_CLKDIV2_PRANK_TURNAROUND_ACTIVATE 0xA +#define DMC620_PMU_CLKDIV2_READ_DEPTH 0xB +#define DMC620_PMU_CLKDIV2_WRITE_DEPTH 0xC +#define DMC620_PMU_CLKDIV2_HIGHHIGH_QOS_DEPTH 0xD +#define DMC620_PMU_CLKDIV2_HIGH_QOS_DEPTH 0xE +#define DMC620_PMU_CLKDIV2_MEDIUM_QOS_DEPTH 0xF +#define DMC620_PMU_CLKDIV2_LOW_QOS_DEPTH 0x10 +#define DMC620_PMU_CLKDIV2_ACTIVATE 0x11 +#define DMC620_PMU_CLKDIV2_RDWR 0x12 +#define DMC620_PMU_CLKDIV2_REFRESH 0x13 +#define DMC620_PMU_CLKDIV2_TRAINING_REQUEST 0x14 +#define DMC620_PMU_CLKDIV2_T_MAC_TRACKER 0x15 +#define DMC620_PMU_CLKDIV2_BK_FSM_TRACKER 0x16 +#define DMC620_PMU_CLKDIV2_BK_OPEN_TRACKER 0x17 +#define DMC620_PMU_CLKDIV2_RANKS_IN_PWR_DOWN 0x18 +#define DMC620_PMU_CLKDIV2_RANKS_IN_SREF 0x19 + +#define DMC620_PMU_CLK_CYCLE_COUNTER 0x20 +#define DMC620_PMU_CLK_REQUEST 0x21 +#define DMC620_PMU_CLK_UPLOAD_STALL 0x22 +#define DMC620_PMU_CLK_INDICATE_MASK 0x20 + +struct arm_dmc620_pmu { + struct pmu pmu; + struct platform_device *pdev; + + void __iomem *pmu_csr; + int irq; + cpumask_t cpu; + struct hlist_node hotplug_node; + + /* + * We put all clkdiv2 and clk counters to a same array. + * The first DMC620_PMU_CLKDIV2_MAX_COUNTERS bits belongs to + * clkdiv2 counters, the last DMC620_PMU_CLK_MAX_COUNTERS + * belongs to clk counters. + */ + DECLARE_BITMAP(used_mask, DMC620_PMU_MAX_COUNTERS); + struct perf_event *act_counter[DMC620_PMU_MAX_COUNTERS]; +}; + +#define to_dmc620_pmu(p) (container_of(p, struct arm_dmc620_pmu, pmu)) + +/* Keep track of our dynamic hotplug state */ +static enum cpuhp_state arm_dmc620_pmu_online; + +static ssize_t +dmc620_pmu_events_sysfs_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 sprintf(page, "event=0x%03llx\n", pmu_attr->id); +} + +#define DMC620_PMU_EVENT_ATTR(name, config) \ + PMU_EVENT_ATTR(name, dmc620_pmu_event_attr_##name, \ + config, dmc620_pmu_events_sysfs_show) + +/* clkdiv2 events list */ +DMC620_PMU_EVENT_ATTR(clkdiv2_cycle_count, + DMC620_PMU_CLKDIV2_CYCLE_COUNT); +DMC620_PMU_EVENT_ATTR(clkdiv2_allocate, + DMC620_PMU_CLKDIV2_ALLOCATE); +DMC620_PMU_EVENT_ATTR(clkdiv2_queue_depth, + DMC620_PMU_CLKDIV2_QUEUE_DEPTH); +DMC620_PMU_EVENT_ATTR(clkdiv2_waiting_for_wr_data, + DMC620_PMU_CLKDIV2_WAITING_FOR_WR_DATA); +DMC620_PMU_EVENT_ATTR(clkdiv2_read_backlog, + DMC620_PMU_CLKDIV2_READ_BACKLOG); +DMC620_PMU_EVENT_ATTR(clkdiv2_waiting_for_mi, + DMC620_PMU_CLKDIV2_WAITING_FOR_MI); +DMC620_PMU_EVENT_ATTR(clkdiv2_hazard_resolution, + DMC620_PMU_CLKDIV2_HAZARD_RESOLUTION); +DMC620_PMU_EVENT_ATTR(clkdiv2_enqueue, + DMC620_PMU_CLKDIV2_ENQUEUE); +DMC620_PMU_EVENT_ATTR(clkdiv2_arbitrate, + DMC620_PMU_CLKDIV2_ARBITRATE); +DMC620_PMU_EVENT_ATTR(clkdiv2_lrank_turnaround_activate, + DMC620_PMU_CLKDIV2_LRANK_TURNAROUND_ACTIVATE); +DMC620_PMU_EVENT_ATTR(clkdiv2_prank_turnaround_activate, + DMC620_PMU_CLKDIV2_PRANK_TURNAROUND_ACTIVATE); +DMC620_PMU_EVENT_ATTR(clkdiv2_read_depth, + DMC620_PMU_CLKDIV2_READ_DEPTH); +DMC620_PMU_EVENT_ATTR(clkdiv2_write_depth, + DMC620_PMU_CLKDIV2_WRITE_DEPTH); +DMC620_PMU_EVENT_ATTR(clkdiv2_highigh_qos_depth, + DMC620_PMU_CLKDIV2_HIGHHIGH_QOS_DEPTH); +DMC620_PMU_EVENT_ATTR(clkdiv2_high_qos_depth, + DMC620_PMU_CLKDIV2_HIGH_QOS_DEPTH); +DMC620_PMU_EVENT_ATTR(clkdiv2_medium_qos_depth, + DMC620_PMU_CLKDIV2_MEDIUM_QOS_DEPTH); +DMC620_PMU_EVENT_ATTR(clkdiv2_low_qos_depth, + DMC620_PMU_CLKDIV2_LOW_QOS_DEPTH); +DMC620_PMU_EVENT_ATTR(clkdiv2_activate, + DMC620_PMU_CLKDIV2_ACTIVATE); +DMC620_PMU_EVENT_ATTR(clkdiv2_rdwr, + DMC620_PMU_CLKDIV2_RDWR); +DMC620_PMU_EVENT_ATTR(clkdiv2_refresh, + DMC620_PMU_CLKDIV2_REFRESH); +DMC620_PMU_EVENT_ATTR(clkdiv2_training_request, + DMC620_PMU_CLKDIV2_TRAINING_REQUEST); +DMC620_PMU_EVENT_ATTR(clkdiv2_t_mac_tracker, + DMC620_PMU_CLKDIV2_T_MAC_TRACKER); +DMC620_PMU_EVENT_ATTR(clkdiv2_bk_fsm_tracker, + DMC620_PMU_CLKDIV2_BK_FSM_TRACKER); +DMC620_PMU_EVENT_ATTR(clkdiv2_bk_open_tracker, + DMC620_PMU_CLKDIV2_BK_OPEN_TRACKER); +DMC620_PMU_EVENT_ATTR(clkdiv2_ranks_in_pwr_down, + DMC620_PMU_CLKDIV2_RANKS_IN_PWR_DOWN); +DMC620_PMU_EVENT_ATTR(clkdiv2_ranks_in_sref, + DMC620_PMU_CLKDIV2_RANKS_IN_SREF); + +/* clk events list */ +DMC620_PMU_EVENT_ATTR(clk_cycle_count, + DMC620_PMU_CLK_CYCLE_COUNTER); +DMC620_PMU_EVENT_ATTR(clk_request, + DMC620_PMU_CLK_REQUEST); +DMC620_PMU_EVENT_ATTR(clk_upload_stall, + DMC620_PMU_CLK_UPLOAD_STALL); + +static struct attribute *arm_dmc620_pmu_events_attrs[] = { + &dmc620_pmu_event_attr_clkdiv2_cycle_count.attr.attr, + &dmc620_pmu_event_attr_clkdiv2_allocate.attr.attr, + &dmc620_pmu_event_attr_clkdiv2_queue_depth.attr.attr, + &dmc620_pmu_event_attr_clkdiv2_waiting_for_wr_data.attr.attr, + &dmc620_pmu_event_attr_clkdiv2_read_backlog.attr.attr, + &dmc620_pmu_event_attr_clkdiv2_waiting_for_mi.attr.attr, + &dmc620_pmu_event_attr_clkdiv2_hazard_resolution.attr.attr, + &dmc620_pmu_event_attr_clkdiv2_enqueue.attr.attr, + &dmc620_pmu_event_attr_clkdiv2_arbitrate.attr.attr, + &dmc620_pmu_event_attr_clkdiv2_lrank_turnaround_activate.attr.attr, + &dmc620_pmu_event_attr_clkdiv2_prank_turnaround_activate.attr.attr, + &dmc620_pmu_event_attr_clkdiv2_read_depth.attr.attr, + &dmc620_pmu_event_attr_clkdiv2_write_depth.attr.attr, + &dmc620_pmu_event_attr_clkdiv2_highigh_qos_depth.attr.attr, + &dmc620_pmu_event_attr_clkdiv2_high_qos_depth.attr.attr, + &dmc620_pmu_event_attr_clkdiv2_medium_qos_depth.attr.attr, + &dmc620_pmu_event_attr_clkdiv2_low_qos_depth.attr.attr, + &dmc620_pmu_event_attr_clkdiv2_activate.attr.attr, + &dmc620_pmu_event_attr_clkdiv2_rdwr.attr.attr, + &dmc620_pmu_event_attr_clkdiv2_refresh.attr.attr, + &dmc620_pmu_event_attr_clkdiv2_training_request.attr.attr, + &dmc620_pmu_event_attr_clkdiv2_t_mac_tracker.attr.attr, + &dmc620_pmu_event_attr_clkdiv2_bk_fsm_tracker.attr.attr, + &dmc620_pmu_event_attr_clkdiv2_bk_open_tracker.attr.attr, + &dmc620_pmu_event_attr_clkdiv2_ranks_in_pwr_down.attr.attr, + &dmc620_pmu_event_attr_clkdiv2_ranks_in_sref.attr.attr, + &dmc620_pmu_event_attr_clk_cycle_count.attr.attr, + &dmc620_pmu_event_attr_clk_request.attr.attr, + &dmc620_pmu_event_attr_clk_upload_stall.attr.attr, + NULL, +}; + +static struct attribute_group arm_dmc620_pmu_events_attr_group = { + .name = "events", + .attrs = arm_dmc620_pmu_events_attrs, +}; + +/* User ABI */ +#define ATTR_CFG_FLD_mask_CFG config +#define ATTR_CFG_FLD_mask_LO 0 +#define ATTR_CFG_FLD_mask_HI 44 +#define ATTR_CFG_FLD_match_CFG config1 +#define ATTR_CFG_FLD_match_LO 0 +#define ATTR_CFG_FLD_match_HI 44 +#define ATTR_CFG_FLD_invert_CFG config2 +#define ATTR_CFG_FLD_invert_LO 0 +#define ATTR_CFG_FLD_invert_HI 0 +#define ATTR_CFG_FLD_incr_CFG config2 +#define ATTR_CFG_FLD_incr_LO 1 +#define ATTR_CFG_FLD_incr_HI 2 +#define ATTR_CFG_FLD_event_CFG config2 +#define ATTR_CFG_FLD_event_LO 3 +#define ATTR_CFG_FLD_event_HI 8 + +#define __GEN_PMU_FORMAT_ATTR(cfg, lo, hi) \ + (lo) == (hi) ? #cfg ":" #lo "\n" : #cfg ":" #lo "-" #hi + +#define _GEN_PMU_FORMAT_ATTR(cfg, lo, hi) \ + __GEN_PMU_FORMAT_ATTR(cfg, lo, hi) + +#define GEN_PMU_FORMAT_ATTR(name) \ + PMU_FORMAT_ATTR(name, \ + _GEN_PMU_FORMAT_ATTR(ATTR_CFG_FLD_##name##_CFG, \ + ATTR_CFG_FLD_##name##_LO, \ + ATTR_CFG_FLD_##name##_HI)) + +#define _ATTR_CFG_GET_FLD(attr, cfg, lo, hi) \ + ((((attr)->cfg) >> lo) & GENMASK(hi - lo, 0)) + +#define ATTR_CFG_GET_FLD(attr, name) \ + _ATTR_CFG_GET_FLD(attr, \ + ATTR_CFG_FLD_##name##_CFG, \ + ATTR_CFG_FLD_##name##_LO, \ + ATTR_CFG_FLD_##name##_HI) + +GEN_PMU_FORMAT_ATTR(mask); +GEN_PMU_FORMAT_ATTR(match); +GEN_PMU_FORMAT_ATTR(invert); +GEN_PMU_FORMAT_ATTR(incr); +GEN_PMU_FORMAT_ATTR(event); + +static struct attribute *arm_dmc620_pmu_formats_attrs[] = { + &format_attr_mask.attr, + &format_attr_match.attr, + &format_attr_invert.attr, + &format_attr_incr.attr, + &format_attr_event.attr, + NULL, +}; + +static struct attribute_group arm_dmc620_pmu_format_attr_group = { + .name = "format", + .attrs = arm_dmc620_pmu_formats_attrs, +}; + +static const struct attribute_group *arm_dmc620_pmu_attr_groups[] = { + &arm_dmc620_pmu_events_attr_group, + &arm_dmc620_pmu_format_attr_group, + NULL, +}; + +static inline +unsigned int arm_dmc620_pmu_counter_read32(struct arm_dmc620_pmu *dmc620_pmu, + unsigned int idx, + unsigned int offset) +{ + return readl(dmc620_pmu->pmu_csr + DMC620_PMU_COUNTERS_BASE_OFFSET + + (idx * DMC620_PMU_COUNTER_REG_BYTE_LENGTH + offset)); +} + +static inline +void arm_dmc620_pmu_counter_write32(struct arm_dmc620_pmu *dmc620_pmu, + unsigned int idx, + unsigned int offset, + unsigned int val) +{ + writel(val, dmc620_pmu->pmu_csr + DMC620_PMU_COUNTERS_BASE_OFFSET + + (idx * DMC620_PMU_COUNTER_REG_BYTE_LENGTH + offset)); +} + +static +unsigned int arm_dmc620_event_to_counter_control(struct perf_event *event) +{ + struct perf_event_attr *attr = &event->attr; + unsigned int reg = 0; + + reg |= ATTR_CFG_GET_FLD(attr, invert) << + DMC620_PMU_COUNTER_CONTROL_INVERT_SHIFT; + reg |= ATTR_CFG_GET_FLD(attr, incr) << + DMC620_PMU_COUNTER_CONTROL_INCR_SHIFT; + reg |= (ATTR_CFG_GET_FLD(attr, event) & + ~DMC620_PMU_CLK_INDICATE_MASK) << + DMC620_PMU_COUNTER_CONTROL_EVENT_MUX_SHIFT; + + return reg; +} + +static int arm_dmc620_get_event_idx(struct perf_event *event) +{ + struct arm_dmc620_pmu *dmc620_pmu = to_dmc620_pmu(event->pmu); + struct perf_event_attr *attr = &event->attr; + int start_idx, end_idx; + int idx; + + if (ATTR_CFG_GET_FLD(attr, event) & DMC620_PMU_CLK_INDICATE_MASK) { + /* clk events are selected */ + start_idx = DMC620_PMU_CLKDIV2_MAX_COUNTERS; + end_idx = DMC620_PMU_MAX_COUNTERS; + } else { + start_idx = 0; + end_idx = DMC620_PMU_CLKDIV2_MAX_COUNTERS; + } + + for (idx = start_idx; idx < end_idx; ++idx) { + if (!test_and_set_bit(idx, dmc620_pmu->used_mask)) + return idx; + } + + /* The counters are all in use. */ + return -EAGAIN; +} + +static u64 arm_dmc620_pmu_read_counter(struct perf_event *event) +{ + struct arm_dmc620_pmu *dmc620_pmu = to_dmc620_pmu(event->pmu); + + return (u64)arm_dmc620_pmu_counter_read32(dmc620_pmu, + event->hw.idx, + DMC620_PMU_COUNTER_VALUE_OFFSET); +} + +static void arm_dmc620_pmu_event_update(struct perf_event *event) +{ + struct hw_perf_event *hwc = &event->hw; + u64 delta, prev_count, new_count; + + do { + /* We may also be called from the irq handler */ + prev_count = local64_read(&hwc->prev_count); + new_count = arm_dmc620_pmu_read_counter(event); + } while (local64_cmpxchg(&hwc->prev_count, + prev_count, new_count) != prev_count); + delta = (new_count - prev_count) & DMC620_CNT_MAX_PERIOD; + local64_add(delta, &event->count); +} + +static void arm_dmc620_pmu_event_set_period(struct perf_event *event) +{ + struct arm_dmc620_pmu *dmc620_pmu = to_dmc620_pmu(event->pmu); + + /* + * All DMC620 PMU event counters are 32bit counters. + * To handle cases of extreme interrupt latency, we program + * the counter with half of the max count for the counters. + */ + u64 val = DMC620_CNT_MAX_PERIOD >> 1; + + local64_set(&event->hw.prev_count, val); + arm_dmc620_pmu_counter_write32(dmc620_pmu, + event->hw.idx, DMC620_PMU_COUNTER_VALUE_OFFSET, + val); +} + +static void arm_dmc620_pmu_enable_counter(struct perf_event *event) +{ + struct arm_dmc620_pmu *dmc620_pmu = to_dmc620_pmu(event->pmu); + unsigned int reg; + + reg = arm_dmc620_pmu_counter_read32(dmc620_pmu, + event->hw.idx, DMC620_PMU_COUNTER_CONTROL_OFFSET); + reg |= DMC620_PMU_COUNTER_CONTROL_ENABLE_MASK; + arm_dmc620_pmu_counter_write32(dmc620_pmu, + event->hw.idx, DMC620_PMU_COUNTER_CONTROL_OFFSET, + reg); +} + +static void arm_dmc620_pmu_disable_counter(struct perf_event *event) +{ + struct arm_dmc620_pmu *dmc620_pmu = to_dmc620_pmu(event->pmu); + unsigned int reg; + + reg = arm_dmc620_pmu_counter_read32(dmc620_pmu, + event->hw.idx, DMC620_PMU_COUNTER_CONTROL_OFFSET); + reg &= ~DMC620_PMU_COUNTER_CONTROL_ENABLE_MASK; + arm_dmc620_pmu_counter_write32(dmc620_pmu, + event->hw.idx, DMC620_PMU_COUNTER_CONTROL_OFFSET, + reg); +} + +static irqreturn_t arm_dmc620_pmu_handle_irq(int irq_num, void *dev) +{ + struct arm_dmc620_pmu *dmc620_pmu = dev; + struct perf_event *event = NULL; + bool handled = false; + unsigned long overflow_clkdiv2, overflow_clk; + int i; + + overflow_clkdiv2 = readl(dmc620_pmu->pmu_csr + + DMC620_PMU_OVERFLOW_STATUS_CLKDIV2_OFFSET); + overflow_clk = readl(dmc620_pmu->pmu_csr + + DMC620_PMU_OVERFLOW_STATUS_CLK_OFFSET); + if (!overflow_clkdiv2 && !overflow_clk) + return IRQ_NONE; + + for_each_set_bit(i, &overflow_clkdiv2, + DMC620_PMU_CLKDIV2_MAX_COUNTERS) { + event = dmc620_pmu->act_counter[i]; + if (!event) + continue; + arm_dmc620_pmu_disable_counter(event); + arm_dmc620_pmu_event_update(event); + arm_dmc620_pmu_event_set_period(event); + arm_dmc620_pmu_enable_counter(event); + handled = true; + } + + for_each_set_bit(i, &overflow_clk, + DMC620_PMU_CLK_MAX_COUNTERS) { + event = dmc620_pmu->act_counter[i + + DMC620_PMU_CLKDIV2_MAX_COUNTERS]; + if (!event) + continue; + arm_dmc620_pmu_disable_counter(event); + arm_dmc620_pmu_event_update(event); + arm_dmc620_pmu_event_set_period(event); + arm_dmc620_pmu_enable_counter(event); + handled = true; + } + + if (overflow_clkdiv2) + writel(0, dmc620_pmu->pmu_csr + + DMC620_PMU_OVERFLOW_STATUS_CLKDIV2_OFFSET); + if (overflow_clk) + writel(0, dmc620_pmu->pmu_csr + + DMC620_PMU_OVERFLOW_STATUS_CLK_OFFSET); + + return IRQ_RETVAL(handled); +} + +static int arm_dmc620_pmu_event_init(struct perf_event *event) +{ + struct arm_dmc620_pmu *dmc620_pmu = to_dmc620_pmu(event->pmu); + + if (event->attr.type != event->pmu->type) + return -ENOENT; + + /* + * DMC 620 PMUs are shared across all cpus and cannot + * support task bound and sampling events. + */ + if (is_sampling_event(event) || + event->attach_state & PERF_ATTACH_TASK) { + dev_dbg(dmc620_pmu->pmu.dev, + "Can't support per-task counters\n"); + return -EINVAL; + } + + /* + * Many perf core operations (eg. events rotation) operate on a + * single CPU context. This is obvious for CPU PMUs, where one + * expects the same sets of events being observed on all CPUs, + * but can lead to issues for off-core PMUs, where each + * event could be theoretically assigned to a different CPU. To + * mitigate this, we enforce CPU assignment to one, selected + * processor. + */ + event->cpu = cpumask_first(&dmc620_pmu->cpu); + + if (event->attr.exclude_user || + event->attr.exclude_kernel || + event->attr.exclude_hv || + event->attr.exclude_idle || + event->attr.exclude_host || + event->attr.exclude_guest) { + dev_dbg(dmc620_pmu->pmu.dev, + "Can't support filtering\n"); + return -EINVAL; + } + + return 0; +} + +static void arm_dmc620_pmu_read(struct perf_event *event) +{ + arm_dmc620_pmu_event_update(event); +} + +static void arm_dmc620_pmu_start(struct perf_event *event, int flags) +{ + struct arm_dmc620_pmu *dmc620_pmu = to_dmc620_pmu(event->pmu); + + event->hw.state = 0; + arm_dmc620_pmu_event_set_period(event); + + if (flags & PERF_EF_RELOAD) { + unsigned long prev_raw_count = + local64_read(&event->hw.prev_count); + + arm_dmc620_pmu_counter_write32(dmc620_pmu, + event->hw.idx, DMC620_PMU_COUNTER_VALUE_OFFSET, + (unsigned int)prev_raw_count); + } + arm_dmc620_pmu_enable_counter(event); +} + +static void arm_dmc620_pmu_stop(struct perf_event *event, int flags) +{ + if (event->hw.state & PERF_HES_STOPPED) + return; + + arm_dmc620_pmu_disable_counter(event); + arm_dmc620_pmu_event_update(event); + event->hw.state |= PERF_HES_STOPPED | PERF_HES_UPTODATE; +} + +static int arm_dmc620_pmu_add(struct perf_event *event, int flags) +{ + struct arm_dmc620_pmu *dmc620_pmu = to_dmc620_pmu(event->pmu); + struct hw_perf_event *hwc = &event->hw; + struct perf_event_attr *attr = &event->attr; + unsigned long reg; + int idx = 0; + + idx = arm_dmc620_get_event_idx(event); + if (idx < 0) + return idx; + + hwc->idx = idx; + dmc620_pmu->act_counter[idx] = event; + hwc->state = PERF_HES_STOPPED | PERF_HES_UPTODATE; + + /* Write to mask 31-00 register */ + reg = ATTR_CFG_GET_FLD(attr, mask); + arm_dmc620_pmu_counter_write32(dmc620_pmu, + event->hw.idx, DMC620_PMU_COUNTER_MASK_31_00_OFFSET, + (unsigned int)(reg & 0xffffffff)); + /* Write to mask 63-32 register */ + arm_dmc620_pmu_counter_write32(dmc620_pmu, + event->hw.idx, DMC620_PMU_COUNTER_MASK_63_32_OFFSET, + (unsigned int)(reg >> 32)); + + /* Write to match 31-00 register */ + reg = ATTR_CFG_GET_FLD(attr, match); + arm_dmc620_pmu_counter_write32(dmc620_pmu, + event->hw.idx, DMC620_PMU_COUNTER_MATCH_31_00_OFFSET, + (unsigned int)(reg & 0xffffffff)); + /* Write to mask 63-32 register */ + arm_dmc620_pmu_counter_write32(dmc620_pmu, + event->hw.idx, DMC620_PMU_COUNTER_MATCH_63_32_OFFSET, + (unsigned int)(reg >> 32)); + + /* Write to control register */ + reg = arm_dmc620_event_to_counter_control(event); + arm_dmc620_pmu_counter_write32(dmc620_pmu, + event->hw.idx, DMC620_PMU_COUNTER_CONTROL_OFFSET, + (unsigned int)reg); + + if (flags & PERF_EF_START) + arm_dmc620_pmu_start(event, PERF_EF_RELOAD); + + perf_event_update_userpage(event); + return 0; +} + +static void arm_dmc620_pmu_del(struct perf_event *event, int flags) +{ + struct arm_dmc620_pmu *dmc620_pmu = to_dmc620_pmu(event->pmu); + struct hw_perf_event *hwc = &event->hw; + int idx = hwc->idx; + + arm_dmc620_pmu_stop(event, PERF_EF_UPDATE); + dmc620_pmu->act_counter[idx] = NULL; + clear_bit(idx, dmc620_pmu->used_mask); + perf_event_update_userpage(event); +} + +static int arm_dmc620_pmu_perf_init(struct arm_dmc620_pmu *dmc620_pmu) +{ + struct device *dev = &dmc620_pmu->pdev->dev; + unsigned long long value; + char *name; + acpi_handle handle; + acpi_status status; + + dmc620_pmu->pmu = (struct pmu) { + .task_ctx_nr = perf_invalid_context, + .module = THIS_MODULE, + .event_init = arm_dmc620_pmu_event_init, + .add = arm_dmc620_pmu_add, + .del = arm_dmc620_pmu_del, + .start = arm_dmc620_pmu_start, + .stop = arm_dmc620_pmu_stop, + .read = arm_dmc620_pmu_read, + .attr_groups = arm_dmc620_pmu_attr_groups, + }; + + handle = ACPI_HANDLE(dev); + if (!handle) + return -ENODEV; + + status = acpi_evaluate_integer(handle, METHOD_NAME__UID, NULL, + &value); + if (ACPI_FAILURE(status)) { + dev_err(dev, "Failed to evaluate _UID (0x%x)\n", status); + return -ENODEV; + } + + name = devm_kasprintf(dev, GFP_KERNEL, "%s_%d", PMUNAME, + (unsigned int)value); + + return perf_pmu_register(&dmc620_pmu->pmu, name, -1); +} + +static void arm_dmc620_pmu_perf_destroy(struct arm_dmc620_pmu *dmc620_pmu) +{ + perf_pmu_unregister(&dmc620_pmu->pmu); +} + +static int arm_dmc620_pmu_cpu_startup(unsigned int cpu, + struct hlist_node *node) +{ + struct arm_dmc620_pmu *dmc620_pmu = hlist_entry_safe(node, + struct arm_dmc620_pmu, + hotplug_node); + + dmc620_pmu = hlist_entry_safe(node, struct arm_dmc620_pmu, + hotplug_node); + if (cpumask_empty(&dmc620_pmu->cpu)) + cpumask_set_cpu(cpu, &dmc620_pmu->cpu); + + /* Overflow interrupt also should use the same CPU */ + WARN_ON(irq_set_affinity(dmc620_pmu->irq, &dmc620_pmu->cpu)); + + return 0; +} + +static int arm_dmc620_pmu_cpu_teardown(unsigned int cpu, + struct hlist_node *node) +{ + struct arm_dmc620_pmu *dmc620_pmu = hlist_entry_safe(node, + struct arm_dmc620_pmu, + hotplug_node); + unsigned int target; + + if (!cpumask_test_and_clear_cpu(cpu, &dmc620_pmu->cpu)) + return 0; + + target = cpumask_any_but(cpu_online_mask, cpu); + if (target >= nr_cpu_ids) + return 0; + + cpumask_set_cpu(target, &dmc620_pmu->cpu); + + /* Overflow interrupt also should use the same CPU */ + WARN_ON(irq_set_affinity(dmc620_pmu->irq, &dmc620_pmu->cpu)); + + return 0; +} + +static int arm_dmc620_pmu_dev_init(struct arm_dmc620_pmu *dmc620_pmu) +{ + struct platform_device *pdev = dmc620_pmu->pdev; + int ret; + + ret = devm_request_irq(&pdev->dev, dmc620_pmu->irq, + arm_dmc620_pmu_handle_irq, + IRQF_SHARED, + dev_name(&pdev->dev), dmc620_pmu); + if (ret) + dev_err(&pdev->dev, + "Could not request IRQ %d\n", dmc620_pmu->irq); + + /* + * Register our hotplug notifier now so we don't miss any events. + */ + return cpuhp_state_add_instance(arm_dmc620_pmu_online, + &dmc620_pmu->hotplug_node); +} + +static void arm_dmc620_pmu_dev_teardown(struct arm_dmc620_pmu *dmc620_pmu) +{ + cpuhp_state_remove_instance(arm_dmc620_pmu_online, + &dmc620_pmu->hotplug_node); +} + +static int arm_dmc620_pmu_resource_probe(struct arm_dmc620_pmu *dmc620_pmu) +{ + struct platform_device *pdev = dmc620_pmu->pdev; + struct resource *res; + int irq; + + irq = platform_get_irq(pdev, 0); + if (irq < 0) { + dev_err(&pdev->dev, "failed to get IRQ (%d)\n", irq); + return -ENXIO; + } + dmc620_pmu->irq = irq; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + dmc620_pmu->pmu_csr = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(dmc620_pmu->pmu_csr)) { + dev_err(&pdev->dev, + "ioremap failed for DMC620 PMU resource\n"); + return -ENXIO; + } + + return 0; +} + +static int arm_dmc620_pmu_device_probe(struct platform_device *pdev) +{ + struct arm_dmc620_pmu *dmc620_pmu; + struct device *dev = &pdev->dev; + int ret; + + dmc620_pmu = devm_kzalloc(dev, sizeof(*dmc620_pmu), GFP_KERNEL); + if (!dmc620_pmu) + return -ENOMEM; + + dmc620_pmu->pdev = pdev; + platform_set_drvdata(pdev, dmc620_pmu); + + ret = arm_dmc620_pmu_resource_probe(dmc620_pmu); + if (ret) + return ret; + + ret = arm_dmc620_pmu_dev_init(dmc620_pmu); + if (ret) + return ret; + + ret = arm_dmc620_pmu_perf_init(dmc620_pmu); + if (ret) + goto out_teardown_dev; + + return 0; + +out_teardown_dev: + arm_dmc620_pmu_dev_teardown(dmc620_pmu); + return ret; +} + +static int arm_dmc620_pmu_device_remove(struct platform_device *pdev) +{ + struct arm_dmc620_pmu *dmc620_pmu = platform_get_drvdata(pdev); + + arm_dmc620_pmu_perf_destroy(dmc620_pmu); + arm_dmc620_pmu_dev_teardown(dmc620_pmu); + return 0; +} + +static const struct acpi_device_id arm_dmc620_acpi_match[] = { + { "AMPC0003", 0}, + {}, +}; +MODULE_DEVICE_TABLE(acpi, arm_dmc620_acpi_match); +static struct platform_driver arm_dmc620_pmu_driver = { + .driver = { + .name = DRVNAME, + .acpi_match_table = ACPI_PTR(arm_dmc620_acpi_match), + }, + .probe = arm_dmc620_pmu_device_probe, + .remove = arm_dmc620_pmu_device_remove, +}; + +static int __init arm_dmc620_pmu_init(void) +{ + int ret; + + ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, DRVNAME, + arm_dmc620_pmu_cpu_startup, + arm_dmc620_pmu_cpu_teardown); + if (ret < 0) + return ret; + + arm_dmc620_pmu_online = ret; + + ret = platform_driver_register(&arm_dmc620_pmu_driver); + if (ret) + cpuhp_remove_multi_state(arm_dmc620_pmu_online); + + return ret; +} + +static void __exit arm_dmc620_pmu_exit(void) +{ + platform_driver_unregister(&arm_dmc620_pmu_driver); + cpuhp_remove_multi_state(arm_dmc620_pmu_online); +} + +module_init(arm_dmc620_pmu_init); +module_exit(arm_dmc620_pmu_exit); + +MODULE_DESCRIPTION("Perf driver for the ARM DMC-620 memory controller"); +MODULE_AUTHOR("Tuan Phan