| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Bharat Bhushan | 3153 | 99.90% | 3 | 75.00% |
| Will Deacon | 3 | 0.10% | 1 | 25.00% |
| Total | 3156 | 4 |
// SPDX-License-Identifier: GPL-2.0 /* Marvell CN10K DRAM Subsystem (DSS) Performance Monitor Driver * * Copyright (C) 2021 Marvell. */ #include <linux/init.h> #include <linux/io.h> #include <linux/module.h> #include <linux/of.h> #include <linux/of_address.h> #include <linux/of_device.h> #include <linux/perf_event.h> #include <linux/hrtimer.h> /* Performance Counters Operating Mode Control Registers */ #define DDRC_PERF_CNT_OP_MODE_CTRL 0x8020 #define OP_MODE_CTRL_VAL_MANNUAL 0x1 /* Performance Counters Start Operation Control Registers */ #define DDRC_PERF_CNT_START_OP_CTRL 0x8028 #define START_OP_CTRL_VAL_START 0x1ULL #define START_OP_CTRL_VAL_ACTIVE 0x2 /* Performance Counters End Operation Control Registers */ #define DDRC_PERF_CNT_END_OP_CTRL 0x8030 #define END_OP_CTRL_VAL_END 0x1ULL /* Performance Counters End Status Registers */ #define DDRC_PERF_CNT_END_STATUS 0x8038 #define END_STATUS_VAL_END_TIMER_MODE_END 0x1 /* Performance Counters Configuration Registers */ #define DDRC_PERF_CFG_BASE 0x8040 /* 8 Generic event counter + 2 fixed event counters */ #define DDRC_PERF_NUM_GEN_COUNTERS 8 #define DDRC_PERF_NUM_FIX_COUNTERS 2 #define DDRC_PERF_READ_COUNTER_IDX DDRC_PERF_NUM_GEN_COUNTERS #define DDRC_PERF_WRITE_COUNTER_IDX (DDRC_PERF_NUM_GEN_COUNTERS + 1) #define DDRC_PERF_NUM_COUNTERS (DDRC_PERF_NUM_GEN_COUNTERS + \ DDRC_PERF_NUM_FIX_COUNTERS) /* Generic event counter registers */ #define DDRC_PERF_CFG(n) (DDRC_PERF_CFG_BASE + 8 * (n)) #define EVENT_ENABLE BIT_ULL(63) /* Two dedicated event counters for DDR reads and writes */ #define EVENT_DDR_READS 101 #define EVENT_DDR_WRITES 100 /* * programmable events IDs in programmable event counters. * DO NOT change these event-id numbers, they are used to * program event bitmap in h/w. */ #define EVENT_OP_IS_ZQLATCH 55 #define EVENT_OP_IS_ZQSTART 54 #define EVENT_OP_IS_TCR_MRR 53 #define EVENT_OP_IS_DQSOSC_MRR 52 #define EVENT_OP_IS_DQSOSC_MPC 51 #define EVENT_VISIBLE_WIN_LIMIT_REACHED_WR 50 #define EVENT_VISIBLE_WIN_LIMIT_REACHED_RD 49 #define EVENT_BSM_STARVATION 48 #define EVENT_BSM_ALLOC 47 #define EVENT_LPR_REQ_WITH_NOCREDIT 46 #define EVENT_HPR_REQ_WITH_NOCREDIT 45 #define EVENT_OP_IS_ZQCS 44 #define EVENT_OP_IS_ZQCL 43 #define EVENT_OP_IS_LOAD_MODE 42 #define EVENT_OP_IS_SPEC_REF 41 #define EVENT_OP_IS_CRIT_REF 40 #define EVENT_OP_IS_REFRESH 39 #define EVENT_OP_IS_ENTER_MPSM 35 #define EVENT_OP_IS_ENTER_POWERDOWN 31 #define EVENT_OP_IS_ENTER_SELFREF 27 #define EVENT_WAW_HAZARD 26 #define EVENT_RAW_HAZARD 25 #define EVENT_WAR_HAZARD 24 #define EVENT_WRITE_COMBINE 23 #define EVENT_RDWR_TRANSITIONS 22 #define EVENT_PRECHARGE_FOR_OTHER 21 #define EVENT_PRECHARGE_FOR_RDWR 20 #define EVENT_OP_IS_PRECHARGE 19 #define EVENT_OP_IS_MWR 18 #define EVENT_OP_IS_WR 17 #define EVENT_OP_IS_RD 16 #define EVENT_OP_IS_RD_ACTIVATE 15 #define EVENT_OP_IS_RD_OR_WR 14 #define EVENT_OP_IS_ACTIVATE 13 #define EVENT_WR_XACT_WHEN_CRITICAL 12 #define EVENT_LPR_XACT_WHEN_CRITICAL 11 #define EVENT_HPR_XACT_WHEN_CRITICAL 10 #define EVENT_DFI_RD_DATA_CYCLES 9 #define EVENT_DFI_WR_DATA_CYCLES 8 #define EVENT_ACT_BYPASS 7 #define EVENT_READ_BYPASS 6 #define EVENT_HIF_HI_PRI_RD 5 #define EVENT_HIF_RMW 4 #define EVENT_HIF_RD 3 #define EVENT_HIF_WR 2 #define EVENT_HIF_RD_OR_WR 1 /* Event counter value registers */ #define DDRC_PERF_CNT_VALUE_BASE 0x8080 #define DDRC_PERF_CNT_VALUE(n) (DDRC_PERF_CNT_VALUE_BASE + 8 * (n)) /* Fixed event counter enable/disable register */ #define DDRC_PERF_CNT_FREERUN_EN 0x80C0 #define DDRC_PERF_FREERUN_WRITE_EN 0x1 #define DDRC_PERF_FREERUN_READ_EN 0x2 /* Fixed event counter control register */ #define DDRC_PERF_CNT_FREERUN_CTRL 0x80C8 #define DDRC_FREERUN_WRITE_CNT_CLR 0x1 #define DDRC_FREERUN_READ_CNT_CLR 0x2 /* Fixed event counter value register */ #define DDRC_PERF_CNT_VALUE_WR_OP 0x80D0 #define DDRC_PERF_CNT_VALUE_RD_OP 0x80D8 #define DDRC_PERF_CNT_VALUE_OVERFLOW BIT_ULL(48) #define DDRC_PERF_CNT_MAX_VALUE GENMASK_ULL(48, 0) struct cn10k_ddr_pmu { struct pmu pmu; void __iomem *base; unsigned int cpu; struct device *dev; int active_events; struct perf_event *events[DDRC_PERF_NUM_COUNTERS]; struct hrtimer hrtimer; struct hlist_node node; }; #define to_cn10k_ddr_pmu(p) container_of(p, struct cn10k_ddr_pmu, pmu) static ssize_t cn10k_ddr_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 CN10K_DDR_PMU_EVENT_ATTR(_name, _id) \ PMU_EVENT_ATTR_ID(_name, cn10k_ddr_pmu_event_show, _id) static struct attribute *cn10k_ddr_perf_events_attrs[] = { CN10K_DDR_PMU_EVENT_ATTR(ddr_hif_rd_or_wr_access, EVENT_HIF_RD_OR_WR), CN10K_DDR_PMU_EVENT_ATTR(ddr_hif_wr_access, EVENT_HIF_WR), CN10K_DDR_PMU_EVENT_ATTR(ddr_hif_rd_access, EVENT_HIF_RD), CN10K_DDR_PMU_EVENT_ATTR(ddr_hif_rmw_access, EVENT_HIF_RMW), CN10K_DDR_PMU_EVENT_ATTR(ddr_hif_pri_rdaccess, EVENT_HIF_HI_PRI_RD), CN10K_DDR_PMU_EVENT_ATTR(ddr_rd_bypass_access, EVENT_READ_BYPASS), CN10K_DDR_PMU_EVENT_ATTR(ddr_act_bypass_access, EVENT_ACT_BYPASS), CN10K_DDR_PMU_EVENT_ATTR(ddr_dif_wr_data_access, EVENT_DFI_WR_DATA_CYCLES), CN10K_DDR_PMU_EVENT_ATTR(ddr_dif_rd_data_access, EVENT_DFI_RD_DATA_CYCLES), CN10K_DDR_PMU_EVENT_ATTR(ddr_hpri_sched_rd_crit_access, EVENT_HPR_XACT_WHEN_CRITICAL), CN10K_DDR_PMU_EVENT_ATTR(ddr_lpri_sched_rd_crit_access, EVENT_LPR_XACT_WHEN_CRITICAL), CN10K_DDR_PMU_EVENT_ATTR(ddr_wr_trxn_crit_access, EVENT_WR_XACT_WHEN_CRITICAL), CN10K_DDR_PMU_EVENT_ATTR(ddr_cam_active_access, EVENT_OP_IS_ACTIVATE), CN10K_DDR_PMU_EVENT_ATTR(ddr_cam_rd_or_wr_access, EVENT_OP_IS_RD_OR_WR), CN10K_DDR_PMU_EVENT_ATTR(ddr_cam_rd_active_access, EVENT_OP_IS_RD_ACTIVATE), CN10K_DDR_PMU_EVENT_ATTR(ddr_cam_read, EVENT_OP_IS_RD), CN10K_DDR_PMU_EVENT_ATTR(ddr_cam_write, EVENT_OP_IS_WR), CN10K_DDR_PMU_EVENT_ATTR(ddr_cam_mwr, EVENT_OP_IS_MWR), CN10K_DDR_PMU_EVENT_ATTR(ddr_precharge, EVENT_OP_IS_PRECHARGE), CN10K_DDR_PMU_EVENT_ATTR(ddr_precharge_for_rdwr, EVENT_PRECHARGE_FOR_RDWR), CN10K_DDR_PMU_EVENT_ATTR(ddr_precharge_for_other, EVENT_PRECHARGE_FOR_OTHER), CN10K_DDR_PMU_EVENT_ATTR(ddr_rdwr_transitions, EVENT_RDWR_TRANSITIONS), CN10K_DDR_PMU_EVENT_ATTR(ddr_write_combine, EVENT_WRITE_COMBINE), CN10K_DDR_PMU_EVENT_ATTR(ddr_war_hazard, EVENT_WAR_HAZARD), CN10K_DDR_PMU_EVENT_ATTR(ddr_raw_hazard, EVENT_RAW_HAZARD), CN10K_DDR_PMU_EVENT_ATTR(ddr_waw_hazard, EVENT_WAW_HAZARD), CN10K_DDR_PMU_EVENT_ATTR(ddr_enter_selfref, EVENT_OP_IS_ENTER_SELFREF), CN10K_DDR_PMU_EVENT_ATTR(ddr_enter_powerdown, EVENT_OP_IS_ENTER_POWERDOWN), CN10K_DDR_PMU_EVENT_ATTR(ddr_enter_mpsm, EVENT_OP_IS_ENTER_MPSM), CN10K_DDR_PMU_EVENT_ATTR(ddr_refresh, EVENT_OP_IS_REFRESH), CN10K_DDR_PMU_EVENT_ATTR(ddr_crit_ref, EVENT_OP_IS_CRIT_REF), CN10K_DDR_PMU_EVENT_ATTR(ddr_spec_ref, EVENT_OP_IS_SPEC_REF), CN10K_DDR_PMU_EVENT_ATTR(ddr_load_mode, EVENT_OP_IS_LOAD_MODE), CN10K_DDR_PMU_EVENT_ATTR(ddr_zqcl, EVENT_OP_IS_ZQCL), CN10K_DDR_PMU_EVENT_ATTR(ddr_cam_wr_access, EVENT_OP_IS_ZQCS), CN10K_DDR_PMU_EVENT_ATTR(ddr_hpr_req_with_nocredit, EVENT_HPR_REQ_WITH_NOCREDIT), CN10K_DDR_PMU_EVENT_ATTR(ddr_lpr_req_with_nocredit, EVENT_LPR_REQ_WITH_NOCREDIT), CN10K_DDR_PMU_EVENT_ATTR(ddr_bsm_alloc, EVENT_BSM_ALLOC), CN10K_DDR_PMU_EVENT_ATTR(ddr_bsm_starvation, EVENT_BSM_STARVATION), CN10K_DDR_PMU_EVENT_ATTR(ddr_win_limit_reached_rd, EVENT_VISIBLE_WIN_LIMIT_REACHED_RD), CN10K_DDR_PMU_EVENT_ATTR(ddr_win_limit_reached_wr, EVENT_VISIBLE_WIN_LIMIT_REACHED_WR), CN10K_DDR_PMU_EVENT_ATTR(ddr_dqsosc_mpc, EVENT_OP_IS_DQSOSC_MPC), CN10K_DDR_PMU_EVENT_ATTR(ddr_dqsosc_mrr, EVENT_OP_IS_DQSOSC_MRR), CN10K_DDR_PMU_EVENT_ATTR(ddr_tcr_mrr, EVENT_OP_IS_TCR_MRR), CN10K_DDR_PMU_EVENT_ATTR(ddr_zqstart, EVENT_OP_IS_ZQSTART), CN10K_DDR_PMU_EVENT_ATTR(ddr_zqlatch, EVENT_OP_IS_ZQLATCH), /* Free run event counters */ CN10K_DDR_PMU_EVENT_ATTR(ddr_ddr_reads, EVENT_DDR_READS), CN10K_DDR_PMU_EVENT_ATTR(ddr_ddr_writes, EVENT_DDR_WRITES), NULL }; static struct attribute_group cn10k_ddr_perf_events_attr_group = { .name = "events", .attrs = cn10k_ddr_perf_events_attrs, }; PMU_FORMAT_ATTR(event, "config:0-8"); static struct attribute *cn10k_ddr_perf_format_attrs[] = { &format_attr_event.attr, NULL, }; static struct attribute_group cn10k_ddr_perf_format_attr_group = { .name = "format", .attrs = cn10k_ddr_perf_format_attrs, }; static ssize_t cn10k_ddr_perf_cpumask_show(struct device *dev, struct device_attribute *attr, char *buf) { struct cn10k_ddr_pmu *pmu = dev_get_drvdata(dev); return cpumap_print_to_pagebuf(true, buf, cpumask_of(pmu->cpu)); } static struct device_attribute cn10k_ddr_perf_cpumask_attr = __ATTR(cpumask, 0444, cn10k_ddr_perf_cpumask_show, NULL); static struct attribute *cn10k_ddr_perf_cpumask_attrs[] = { &cn10k_ddr_perf_cpumask_attr.attr, NULL, }; static struct attribute_group cn10k_ddr_perf_cpumask_attr_group = { .attrs = cn10k_ddr_perf_cpumask_attrs, }; static const struct attribute_group *cn10k_attr_groups[] = { &cn10k_ddr_perf_events_attr_group, &cn10k_ddr_perf_format_attr_group, &cn10k_ddr_perf_cpumask_attr_group, NULL, }; /* Default poll timeout is 100 sec, which is very sufficient for * 48 bit counter incremented max at 5.6 GT/s, which may take many * hours to overflow. */ static unsigned long cn10k_ddr_pmu_poll_period_sec = 100; module_param_named(poll_period_sec, cn10k_ddr_pmu_poll_period_sec, ulong, 0644); static ktime_t cn10k_ddr_pmu_timer_period(void) { return ms_to_ktime((u64)cn10k_ddr_pmu_poll_period_sec * USEC_PER_SEC); } static int ddr_perf_get_event_bitmap(int eventid, u64 *event_bitmap) { switch (eventid) { case EVENT_HIF_RD_OR_WR ... EVENT_WAW_HAZARD: case EVENT_OP_IS_REFRESH ... EVENT_OP_IS_ZQLATCH: *event_bitmap = (1ULL << (eventid - 1)); break; case EVENT_OP_IS_ENTER_SELFREF: case EVENT_OP_IS_ENTER_POWERDOWN: case EVENT_OP_IS_ENTER_MPSM: *event_bitmap = (0xFULL << (eventid - 1)); break; default: pr_err("%s Invalid eventid %d\n", __func__, eventid); return -EINVAL; } return 0; } static int cn10k_ddr_perf_alloc_counter(struct cn10k_ddr_pmu *pmu, struct perf_event *event) { u8 config = event->attr.config; int i; /* DDR read free-run counter index */ if (config == EVENT_DDR_READS) { pmu->events[DDRC_PERF_READ_COUNTER_IDX] = event; return DDRC_PERF_READ_COUNTER_IDX; } /* DDR write free-run counter index */ if (config == EVENT_DDR_WRITES) { pmu->events[DDRC_PERF_WRITE_COUNTER_IDX] = event; return DDRC_PERF_WRITE_COUNTER_IDX; } /* Allocate DDR generic counters */ for (i = 0; i < DDRC_PERF_NUM_GEN_COUNTERS; i++) { if (pmu->events[i] == NULL) { pmu->events[i] = event; return i; } } return -ENOENT; } static void cn10k_ddr_perf_free_counter(struct cn10k_ddr_pmu *pmu, int counter) { pmu->events[counter] = NULL; } static int cn10k_ddr_perf_event_init(struct perf_event *event) { struct cn10k_ddr_pmu *pmu = to_cn10k_ddr_pmu(event->pmu); struct hw_perf_event *hwc = &event->hw; if (event->attr.type != event->pmu->type) return -ENOENT; if (is_sampling_event(event)) { dev_info(pmu->dev, "Sampling not supported!\n"); return -EOPNOTSUPP; } if (event->cpu < 0) { dev_warn(pmu->dev, "Can't provide per-task data!\n"); return -EOPNOTSUPP; } /* We must NOT create groups containing mixed PMUs */ if (event->group_leader->pmu != event->pmu && !is_software_event(event->group_leader)) return -EINVAL; /* Set ownership of event to one CPU, same event can not be observed * on multiple cpus at same time. */ event->cpu = pmu->cpu; hwc->idx = -1; return 0; } static void cn10k_ddr_perf_counter_enable(struct cn10k_ddr_pmu *pmu, int counter, bool enable) { u32 reg; u64 val; if (counter > DDRC_PERF_NUM_COUNTERS) { pr_err("Error: unsupported counter %d\n", counter); return; } if (counter < DDRC_PERF_NUM_GEN_COUNTERS) { reg = DDRC_PERF_CFG(counter); val = readq_relaxed(pmu->base + reg); if (enable) val |= EVENT_ENABLE; else val &= ~EVENT_ENABLE; writeq_relaxed(val, pmu->base + reg); } else { val = readq_relaxed(pmu->base + DDRC_PERF_CNT_FREERUN_EN); if (enable) { if (counter == DDRC_PERF_READ_COUNTER_IDX) val |= DDRC_PERF_FREERUN_READ_EN; else val |= DDRC_PERF_FREERUN_WRITE_EN; } else { if (counter == DDRC_PERF_READ_COUNTER_IDX) val &= ~DDRC_PERF_FREERUN_READ_EN; else val &= ~DDRC_PERF_FREERUN_WRITE_EN; } writeq_relaxed(val, pmu->base + DDRC_PERF_CNT_FREERUN_EN); } } static u64 cn10k_ddr_perf_read_counter(struct cn10k_ddr_pmu *pmu, int counter) { u64 val; if (counter == DDRC_PERF_READ_COUNTER_IDX) return readq_relaxed(pmu->base + DDRC_PERF_CNT_VALUE_RD_OP); if (counter == DDRC_PERF_WRITE_COUNTER_IDX) return readq_relaxed(pmu->base + DDRC_PERF_CNT_VALUE_WR_OP); val = readq_relaxed(pmu->base + DDRC_PERF_CNT_VALUE(counter)); return val; } static void cn10k_ddr_perf_event_update(struct perf_event *event) { struct cn10k_ddr_pmu *pmu = to_cn10k_ddr_pmu(event->pmu); struct hw_perf_event *hwc = &event->hw; u64 prev_count, new_count, mask; do { prev_count = local64_read(&hwc->prev_count); new_count = cn10k_ddr_perf_read_counter(pmu, hwc->idx); } while (local64_xchg(&hwc->prev_count, new_count) != prev_count); mask = DDRC_PERF_CNT_MAX_VALUE; local64_add((new_count - prev_count) & mask, &event->count); } static void cn10k_ddr_perf_event_start(struct perf_event *event, int flags) { struct cn10k_ddr_pmu *pmu = to_cn10k_ddr_pmu(event->pmu); struct hw_perf_event *hwc = &event->hw; int counter = hwc->idx; local64_set(&hwc->prev_count, 0); cn10k_ddr_perf_counter_enable(pmu, counter, true); hwc->state = 0; } static int cn10k_ddr_perf_event_add(struct perf_event *event, int flags) { struct cn10k_ddr_pmu *pmu = to_cn10k_ddr_pmu(event->pmu); struct hw_perf_event *hwc = &event->hw; u8 config = event->attr.config; int counter, ret; u32 reg_offset; u64 val; counter = cn10k_ddr_perf_alloc_counter(pmu, event); if (counter < 0) return -EAGAIN; pmu->active_events++; hwc->idx = counter; if (pmu->active_events == 1) hrtimer_start(&pmu->hrtimer, cn10k_ddr_pmu_timer_period(), HRTIMER_MODE_REL_PINNED); if (counter < DDRC_PERF_NUM_GEN_COUNTERS) { /* Generic counters, configure event id */ reg_offset = DDRC_PERF_CFG(counter); ret = ddr_perf_get_event_bitmap(config, &val); if (ret) return ret; writeq_relaxed(val, pmu->base + reg_offset); } else { /* fixed event counter, clear counter value */ if (counter == DDRC_PERF_READ_COUNTER_IDX) val = DDRC_FREERUN_READ_CNT_CLR; else val = DDRC_FREERUN_WRITE_CNT_CLR; writeq_relaxed(val, pmu->base + DDRC_PERF_CNT_FREERUN_CTRL); } hwc->state |= PERF_HES_STOPPED; if (flags & PERF_EF_START) cn10k_ddr_perf_event_start(event, flags); return 0; } static void cn10k_ddr_perf_event_stop(struct perf_event *event, int flags) { struct cn10k_ddr_pmu *pmu = to_cn10k_ddr_pmu(event->pmu); struct hw_perf_event *hwc = &event->hw; int counter = hwc->idx; cn10k_ddr_perf_counter_enable(pmu, counter, false); if (flags & PERF_EF_UPDATE) cn10k_ddr_perf_event_update(event); hwc->state |= PERF_HES_STOPPED; } static void cn10k_ddr_perf_event_del(struct perf_event *event, int flags) { struct cn10k_ddr_pmu *pmu = to_cn10k_ddr_pmu(event->pmu); struct hw_perf_event *hwc = &event->hw; int counter = hwc->idx; cn10k_ddr_perf_event_stop(event, PERF_EF_UPDATE); cn10k_ddr_perf_free_counter(pmu, counter); pmu->active_events--; hwc->idx = -1; /* Cancel timer when no events to capture */ if (pmu->active_events == 0) hrtimer_cancel(&pmu->hrtimer); } static void cn10k_ddr_perf_pmu_enable(struct pmu *pmu) { struct cn10k_ddr_pmu *ddr_pmu = to_cn10k_ddr_pmu(pmu); writeq_relaxed(START_OP_CTRL_VAL_START, ddr_pmu->base + DDRC_PERF_CNT_START_OP_CTRL); } static void cn10k_ddr_perf_pmu_disable(struct pmu *pmu) { struct cn10k_ddr_pmu *ddr_pmu = to_cn10k_ddr_pmu(pmu); writeq_relaxed(END_OP_CTRL_VAL_END, ddr_pmu->base + DDRC_PERF_CNT_END_OP_CTRL); } static void cn10k_ddr_perf_event_update_all(struct cn10k_ddr_pmu *pmu) { struct hw_perf_event *hwc; int i; for (i = 0; i < DDRC_PERF_NUM_GEN_COUNTERS; i++) { if (pmu->events[i] == NULL) continue; cn10k_ddr_perf_event_update(pmu->events[i]); } /* Reset previous count as h/w counter are reset */ for (i = 0; i < DDRC_PERF_NUM_GEN_COUNTERS; i++) { if (pmu->events[i] == NULL) continue; hwc = &pmu->events[i]->hw; local64_set(&hwc->prev_count, 0); } } static irqreturn_t cn10k_ddr_pmu_overflow_handler(struct cn10k_ddr_pmu *pmu) { struct perf_event *event; struct hw_perf_event *hwc; u64 prev_count, new_count; u64 value; int i; event = pmu->events[DDRC_PERF_READ_COUNTER_IDX]; if (event) { hwc = &event->hw; prev_count = local64_read(&hwc->prev_count); new_count = cn10k_ddr_perf_read_counter(pmu, hwc->idx); /* Overflow condition is when new count less than * previous count */ if (new_count < prev_count) cn10k_ddr_perf_event_update(event); } event = pmu->events[DDRC_PERF_WRITE_COUNTER_IDX]; if (event) { hwc = &event->hw; prev_count = local64_read(&hwc->prev_count); new_count = cn10k_ddr_perf_read_counter(pmu, hwc->idx); /* Overflow condition is when new count less than * previous count */ if (new_count < prev_count) cn10k_ddr_perf_event_update(event); } for (i = 0; i < DDRC_PERF_NUM_GEN_COUNTERS; i++) { if (pmu->events[i] == NULL) continue; value = cn10k_ddr_perf_read_counter(pmu, i); if (value == DDRC_PERF_CNT_MAX_VALUE) { pr_info("Counter-(%d) reached max value\n", i); cn10k_ddr_perf_event_update_all(pmu); cn10k_ddr_perf_pmu_disable(&pmu->pmu); cn10k_ddr_perf_pmu_enable(&pmu->pmu); } } return IRQ_HANDLED; } static enum hrtimer_restart cn10k_ddr_pmu_timer_handler(struct hrtimer *hrtimer) { struct cn10k_ddr_pmu *pmu = container_of(hrtimer, struct cn10k_ddr_pmu, hrtimer); unsigned long flags; local_irq_save(flags); cn10k_ddr_pmu_overflow_handler(pmu); local_irq_restore(flags); hrtimer_forward_now(hrtimer, cn10k_ddr_pmu_timer_period()); return HRTIMER_RESTART; } static int cn10k_ddr_pmu_offline_cpu(unsigned int cpu, struct hlist_node *node) { struct cn10k_ddr_pmu *pmu = hlist_entry_safe(node, struct cn10k_ddr_pmu, node); unsigned int target; if (cpu != pmu->cpu) return 0; target = cpumask_any_but(cpu_online_mask, cpu); if (target >= nr_cpu_ids) return 0; perf_pmu_migrate_context(&pmu->pmu, cpu, target); pmu->cpu = target; return 0; } static int cn10k_ddr_perf_probe(struct platform_device *pdev) { struct cn10k_ddr_pmu *ddr_pmu; struct resource *res; void __iomem *base; char *name; int ret; ddr_pmu = devm_kzalloc(&pdev->dev, sizeof(*ddr_pmu), GFP_KERNEL); if (!ddr_pmu) return -ENOMEM; ddr_pmu->dev = &pdev->dev; platform_set_drvdata(pdev, ddr_pmu); base = devm_platform_get_and_ioremap_resource(pdev, 0, &res); if (IS_ERR(base)) return PTR_ERR(base); ddr_pmu->base = base; /* Setup the PMU counter to work in manual mode */ writeq_relaxed(OP_MODE_CTRL_VAL_MANNUAL, ddr_pmu->base + DDRC_PERF_CNT_OP_MODE_CTRL); ddr_pmu->pmu = (struct pmu) { .module = THIS_MODULE, .capabilities = PERF_PMU_CAP_NO_EXCLUDE, .task_ctx_nr = perf_invalid_context, .attr_groups = cn10k_attr_groups, .event_init = cn10k_ddr_perf_event_init, .add = cn10k_ddr_perf_event_add, .del = cn10k_ddr_perf_event_del, .start = cn10k_ddr_perf_event_start, .stop = cn10k_ddr_perf_event_stop, .read = cn10k_ddr_perf_event_update, .pmu_enable = cn10k_ddr_perf_pmu_enable, .pmu_disable = cn10k_ddr_perf_pmu_disable, }; /* Choose this cpu to collect perf data */ ddr_pmu->cpu = raw_smp_processor_id(); name = devm_kasprintf(ddr_pmu->dev, GFP_KERNEL, "mrvl_ddr_pmu_%llx", res->start); if (!name) return -ENOMEM; hrtimer_init(&ddr_pmu->hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); ddr_pmu->hrtimer.function = cn10k_ddr_pmu_timer_handler; cpuhp_state_add_instance_nocalls( CPUHP_AP_PERF_ARM_MARVELL_CN10K_DDR_ONLINE, &ddr_pmu->node); ret = perf_pmu_register(&ddr_pmu->pmu, name, -1); if (ret) goto error; pr_info("CN10K DDR PMU Driver for ddrc@%llx\n", res->start); return 0; error: cpuhp_state_remove_instance_nocalls( CPUHP_AP_PERF_ARM_MARVELL_CN10K_DDR_ONLINE, &ddr_pmu->node); return ret; } static int cn10k_ddr_perf_remove(struct platform_device *pdev) { struct cn10k_ddr_pmu *ddr_pmu = platform_get_drvdata(pdev); cpuhp_state_remove_instance_nocalls( CPUHP_AP_PERF_ARM_MARVELL_CN10K_DDR_ONLINE, &ddr_pmu->node); perf_pmu_unregister(&ddr_pmu->pmu); return 0; } #ifdef CONFIG_OF static const struct of_device_id cn10k_ddr_pmu_of_match[] = { { .compatible = "marvell,cn10k-ddr-pmu", }, { }, }; MODULE_DEVICE_TABLE(of, cn10k_ddr_pmu_of_match); #endif static struct platform_driver cn10k_ddr_pmu_driver = { .driver = { .name = "cn10k-ddr-pmu", .of_match_table = of_match_ptr(cn10k_ddr_pmu_of_match), .suppress_bind_attrs = true, }, .probe = cn10k_ddr_perf_probe, .remove = cn10k_ddr_perf_remove, }; static int __init cn10k_ddr_pmu_init(void) { int ret; ret = cpuhp_setup_state_multi( CPUHP_AP_PERF_ARM_MARVELL_CN10K_DDR_ONLINE, "perf/marvell/cn10k/ddr:online", NULL, cn10k_ddr_pmu_offline_cpu); if (ret) return ret; ret = platform_driver_register(&cn10k_ddr_pmu_driver); if (ret) cpuhp_remove_multi_state( CPUHP_AP_PERF_ARM_MARVELL_CN10K_DDR_ONLINE); return ret; } static void __exit cn10k_ddr_pmu_exit(void) { platform_driver_unregister(&cn10k_ddr_pmu_driver); cpuhp_remove_multi_state(CPUHP_AP_PERF_ARM_MARVELL_CN10K_DDR_ONLINE); } module_init(cn10k_ddr_pmu_init); module_exit(cn10k_ddr_pmu_exit); MODULE_AUTHOR("Bharat Bhushan <bbhushan2@marvell.com>"); MODULE_LICENSE("GPL v2");
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