| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Tuan Phan | 3174 | 95.63% | 1 | 7.69% |
| Xin Yang | 79 | 2.38% | 1 | 7.69% |
| Waiman Long | 21 | 0.63% | 1 | 7.69% |
| Shang XiaoJing | 12 | 0.36% | 1 | 7.69% |
| Jonathan Cameron | 8 | 0.24% | 1 | 7.69% |
| Qi Liu | 6 | 0.18% | 2 | 15.38% |
| Wei Yongjun | 5 | 0.15% | 1 | 7.69% |
| Li Yang | 4 | 0.12% | 1 | 7.69% |
| Namhyung Kim | 4 | 0.12% | 1 | 7.69% |
| Thomas Gleixner | 2 | 0.06% | 1 | 7.69% |
| Uwe Kleine-König | 2 | 0.06% | 1 | 7.69% |
| Rikard Falkeborn | 2 | 0.06% | 1 | 7.69% |
| Total | 3319 | 13 |
// SPDX-License-Identifier: GPL-2.0-only /* * ARM DMC-620 memory controller PMU driver * * Copyright (C) 2020 Ampere Computing LLC. */ #define DMC620_PMUNAME "arm_dmc620" #define DMC620_DRVNAME DMC620_PMUNAME "_pmu" #define pr_fmt(fmt) DMC620_DRVNAME ": " fmt #include <linux/acpi.h> #include <linux/bitfield.h> #include <linux/bitops.h> #include <linux/cpuhotplug.h> #include <linux/cpumask.h> #include <linux/device.h> #include <linux/errno.h> #include <linux/interrupt.h> #include <linux/irq.h> #include <linux/kernel.h> #include <linux/list.h> #include <linux/module.h> #include <linux/mutex.h> #include <linux/perf_event.h> #include <linux/platform_device.h> #include <linux/printk.h> #include <linux/rculist.h> #include <linux/refcount.h> #define DMC620_PA_SHIFT 12 #define DMC620_CNT_INIT 0x80000000 #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) /* * The PMU registers start at 0xA00 in the DMC-620 memory map, and these * offsets are relative to that base. * * Each counter has a group of control/value registers, and the * DMC620_PMU_COUNTERn offsets are within a counter group. * * The counter registers groups start at 0xA10. */ #define DMC620_PMU_OVERFLOW_STATUS_CLKDIV2 0x8 #define DMC620_PMU_OVERFLOW_STATUS_CLKDIV2_MASK \ (DMC620_PMU_CLKDIV2_MAX_COUNTERS - 1) #define DMC620_PMU_OVERFLOW_STATUS_CLK 0xC #define DMC620_PMU_OVERFLOW_STATUS_CLK_MASK \ (DMC620_PMU_CLK_MAX_COUNTERS - 1) #define DMC620_PMU_COUNTERS_BASE 0x10 #define DMC620_PMU_COUNTERn_MASK_31_00 0x0 #define DMC620_PMU_COUNTERn_MASK_63_32 0x4 #define DMC620_PMU_COUNTERn_MATCH_31_00 0x8 #define DMC620_PMU_COUNTERn_MATCH_63_32 0xC #define DMC620_PMU_COUNTERn_CONTROL 0x10 #define DMC620_PMU_COUNTERn_CONTROL_ENABLE BIT(0) #define DMC620_PMU_COUNTERn_CONTROL_INVERT BIT(1) #define DMC620_PMU_COUNTERn_CONTROL_EVENT_MUX GENMASK(6, 2) #define DMC620_PMU_COUNTERn_CONTROL_INCR_MUX GENMASK(8, 7) #define DMC620_PMU_COUNTERn_VALUE 0x20 /* Offset of the registers for a given counter, relative to 0xA00 */ #define DMC620_PMU_COUNTERn_OFFSET(n) \ (DMC620_PMU_COUNTERS_BASE + 0x28 * (n)) /* * dmc620_pmu_irqs_lock: protects dmc620_pmu_irqs list * dmc620_pmu_node_lock: protects pmus_node lists in all dmc620_pmu instances */ static DEFINE_MUTEX(dmc620_pmu_irqs_lock); static DEFINE_MUTEX(dmc620_pmu_node_lock); static LIST_HEAD(dmc620_pmu_irqs); struct dmc620_pmu_irq { struct hlist_node node; struct list_head pmus_node; struct list_head irqs_node; refcount_t refcount; unsigned int irq_num; unsigned int cpu; }; struct dmc620_pmu { struct pmu pmu; void __iomem *base; struct dmc620_pmu_irq *irq; struct list_head pmus_node; /* * We put all clkdiv2 and clk counters to a same array. * The first DMC620_PMU_CLKDIV2_MAX_COUNTERS bits belong to * clkdiv2 counters, the last DMC620_PMU_CLK_MAX_COUNTERS * belong to clk counters. */ DECLARE_BITMAP(used_mask, DMC620_PMU_MAX_COUNTERS); struct perf_event *events[DMC620_PMU_MAX_COUNTERS]; }; #define to_dmc620_pmu(p) (container_of(p, struct dmc620_pmu, pmu)) static int cpuhp_state_num; struct dmc620_pmu_event_attr { struct device_attribute attr; u8 clkdiv2; u8 eventid; }; static ssize_t dmc620_pmu_event_show(struct device *dev, struct device_attribute *attr, char *page) { struct dmc620_pmu_event_attr *eattr; eattr = container_of(attr, typeof(*eattr), attr); return sysfs_emit(page, "event=0x%x,clkdiv2=0x%x\n", eattr->eventid, eattr->clkdiv2); } #define DMC620_PMU_EVENT_ATTR(_name, _eventid, _clkdiv2) \ (&((struct dmc620_pmu_event_attr[]) {{ \ .attr = __ATTR(_name, 0444, dmc620_pmu_event_show, NULL), \ .clkdiv2 = _clkdiv2, \ .eventid = _eventid, \ }})[0].attr.attr) static struct attribute *dmc620_pmu_events_attrs[] = { /* clkdiv2 events list */ DMC620_PMU_EVENT_ATTR(clkdiv2_cycle_count, 0x0, 1), DMC620_PMU_EVENT_ATTR(clkdiv2_allocate, 0x1, 1), DMC620_PMU_EVENT_ATTR(clkdiv2_queue_depth, 0x2, 1), DMC620_PMU_EVENT_ATTR(clkdiv2_waiting_for_wr_data, 0x3, 1), DMC620_PMU_EVENT_ATTR(clkdiv2_read_backlog, 0x4, 1), DMC620_PMU_EVENT_ATTR(clkdiv2_waiting_for_mi, 0x5, 1), DMC620_PMU_EVENT_ATTR(clkdiv2_hazard_resolution, 0x6, 1), DMC620_PMU_EVENT_ATTR(clkdiv2_enqueue, 0x7, 1), DMC620_PMU_EVENT_ATTR(clkdiv2_arbitrate, 0x8, 1), DMC620_PMU_EVENT_ATTR(clkdiv2_lrank_turnaround_activate, 0x9, 1), DMC620_PMU_EVENT_ATTR(clkdiv2_prank_turnaround_activate, 0xa, 1), DMC620_PMU_EVENT_ATTR(clkdiv2_read_depth, 0xb, 1), DMC620_PMU_EVENT_ATTR(clkdiv2_write_depth, 0xc, 1), DMC620_PMU_EVENT_ATTR(clkdiv2_highigh_qos_depth, 0xd, 1), DMC620_PMU_EVENT_ATTR(clkdiv2_high_qos_depth, 0xe, 1), DMC620_PMU_EVENT_ATTR(clkdiv2_medium_qos_depth, 0xf, 1), DMC620_PMU_EVENT_ATTR(clkdiv2_low_qos_depth, 0x10, 1), DMC620_PMU_EVENT_ATTR(clkdiv2_activate, 0x11, 1), DMC620_PMU_EVENT_ATTR(clkdiv2_rdwr, 0x12, 1), DMC620_PMU_EVENT_ATTR(clkdiv2_refresh, 0x13, 1), DMC620_PMU_EVENT_ATTR(clkdiv2_training_request, 0x14, 1), DMC620_PMU_EVENT_ATTR(clkdiv2_t_mac_tracker, 0x15, 1), DMC620_PMU_EVENT_ATTR(clkdiv2_bk_fsm_tracker, 0x16, 1), DMC620_PMU_EVENT_ATTR(clkdiv2_bk_open_tracker, 0x17, 1), DMC620_PMU_EVENT_ATTR(clkdiv2_ranks_in_pwr_down, 0x18, 1), DMC620_PMU_EVENT_ATTR(clkdiv2_ranks_in_sref, 0x19, 1), /* clk events list */ DMC620_PMU_EVENT_ATTR(clk_cycle_count, 0x0, 0), DMC620_PMU_EVENT_ATTR(clk_request, 0x1, 0), DMC620_PMU_EVENT_ATTR(clk_upload_stall, 0x2, 0), NULL, }; static const struct attribute_group dmc620_pmu_events_attr_group = { .name = "events", .attrs = 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 ATTR_CFG_FLD_clkdiv2_CFG config2 #define ATTR_CFG_FLD_clkdiv2_LO 9 #define ATTR_CFG_FLD_clkdiv2_HI 9 #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_ULL(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); GEN_PMU_FORMAT_ATTR(clkdiv2); static struct attribute *dmc620_pmu_formats_attrs[] = { &format_attr_mask.attr, &format_attr_match.attr, &format_attr_invert.attr, &format_attr_incr.attr, &format_attr_event.attr, &format_attr_clkdiv2.attr, NULL, }; static const struct attribute_group dmc620_pmu_format_attr_group = { .name = "format", .attrs = dmc620_pmu_formats_attrs, }; static ssize_t dmc620_pmu_cpumask_show(struct device *dev, struct device_attribute *attr, char *buf) { struct dmc620_pmu *dmc620_pmu = to_dmc620_pmu(dev_get_drvdata(dev)); return cpumap_print_to_pagebuf(true, buf, cpumask_of(dmc620_pmu->irq->cpu)); } static struct device_attribute dmc620_pmu_cpumask_attr = __ATTR(cpumask, 0444, dmc620_pmu_cpumask_show, NULL); static struct attribute *dmc620_pmu_cpumask_attrs[] = { &dmc620_pmu_cpumask_attr.attr, NULL, }; static const struct attribute_group dmc620_pmu_cpumask_attr_group = { .attrs = dmc620_pmu_cpumask_attrs, }; static const struct attribute_group *dmc620_pmu_attr_groups[] = { &dmc620_pmu_events_attr_group, &dmc620_pmu_format_attr_group, &dmc620_pmu_cpumask_attr_group, NULL, }; static inline u32 dmc620_pmu_creg_read(struct dmc620_pmu *dmc620_pmu, unsigned int idx, unsigned int reg) { return readl(dmc620_pmu->base + DMC620_PMU_COUNTERn_OFFSET(idx) + reg); } static inline void dmc620_pmu_creg_write(struct dmc620_pmu *dmc620_pmu, unsigned int idx, unsigned int reg, u32 val) { writel(val, dmc620_pmu->base + DMC620_PMU_COUNTERn_OFFSET(idx) + reg); } static unsigned int dmc620_event_to_counter_control(struct perf_event *event) { struct perf_event_attr *attr = &event->attr; unsigned int reg = 0; reg |= FIELD_PREP(DMC620_PMU_COUNTERn_CONTROL_INVERT, ATTR_CFG_GET_FLD(attr, invert)); reg |= FIELD_PREP(DMC620_PMU_COUNTERn_CONTROL_EVENT_MUX, ATTR_CFG_GET_FLD(attr, event)); reg |= FIELD_PREP(DMC620_PMU_COUNTERn_CONTROL_INCR_MUX, ATTR_CFG_GET_FLD(attr, incr)); return reg; } static int dmc620_get_event_idx(struct perf_event *event) { struct dmc620_pmu *dmc620_pmu = to_dmc620_pmu(event->pmu); int idx, start_idx, end_idx; if (ATTR_CFG_GET_FLD(&event->attr, clkdiv2)) { start_idx = 0; end_idx = DMC620_PMU_CLKDIV2_MAX_COUNTERS; } else { start_idx = DMC620_PMU_CLKDIV2_MAX_COUNTERS; end_idx = DMC620_PMU_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 inline u64 dmc620_pmu_read_counter(struct perf_event *event) { struct dmc620_pmu *dmc620_pmu = to_dmc620_pmu(event->pmu); return dmc620_pmu_creg_read(dmc620_pmu, event->hw.idx, DMC620_PMU_COUNTERn_VALUE); } static void 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 = 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 dmc620_pmu_event_set_period(struct perf_event *event) { struct dmc620_pmu *dmc620_pmu = to_dmc620_pmu(event->pmu); local64_set(&event->hw.prev_count, DMC620_CNT_INIT); dmc620_pmu_creg_write(dmc620_pmu, event->hw.idx, DMC620_PMU_COUNTERn_VALUE, DMC620_CNT_INIT); } static void dmc620_pmu_enable_counter(struct perf_event *event) { struct dmc620_pmu *dmc620_pmu = to_dmc620_pmu(event->pmu); u32 reg; reg = dmc620_event_to_counter_control(event) | DMC620_PMU_COUNTERn_CONTROL_ENABLE; dmc620_pmu_creg_write(dmc620_pmu, event->hw.idx, DMC620_PMU_COUNTERn_CONTROL, reg); } static void dmc620_pmu_disable_counter(struct perf_event *event) { struct dmc620_pmu *dmc620_pmu = to_dmc620_pmu(event->pmu); dmc620_pmu_creg_write(dmc620_pmu, event->hw.idx, DMC620_PMU_COUNTERn_CONTROL, 0); } static irqreturn_t dmc620_pmu_handle_irq(int irq_num, void *data) { struct dmc620_pmu_irq *irq = data; struct dmc620_pmu *dmc620_pmu; irqreturn_t ret = IRQ_NONE; rcu_read_lock(); list_for_each_entry_rcu(dmc620_pmu, &irq->pmus_node, pmus_node) { unsigned long status; struct perf_event *event; unsigned int idx; /* * HW doesn't provide a control to atomically disable all counters. * To prevent race condition (overflow happens while clearing status register), * disable all events before continuing */ for (idx = 0; idx < DMC620_PMU_MAX_COUNTERS; idx++) { event = dmc620_pmu->events[idx]; if (!event) continue; dmc620_pmu_disable_counter(event); } status = readl(dmc620_pmu->base + DMC620_PMU_OVERFLOW_STATUS_CLKDIV2); status |= (readl(dmc620_pmu->base + DMC620_PMU_OVERFLOW_STATUS_CLK) << DMC620_PMU_CLKDIV2_MAX_COUNTERS); if (status) { for_each_set_bit(idx, &status, DMC620_PMU_MAX_COUNTERS) { event = dmc620_pmu->events[idx]; if (WARN_ON_ONCE(!event)) continue; dmc620_pmu_event_update(event); dmc620_pmu_event_set_period(event); } if (status & DMC620_PMU_OVERFLOW_STATUS_CLKDIV2_MASK) writel(0, dmc620_pmu->base + DMC620_PMU_OVERFLOW_STATUS_CLKDIV2); if ((status >> DMC620_PMU_CLKDIV2_MAX_COUNTERS) & DMC620_PMU_OVERFLOW_STATUS_CLK_MASK) writel(0, dmc620_pmu->base + DMC620_PMU_OVERFLOW_STATUS_CLK); } for (idx = 0; idx < DMC620_PMU_MAX_COUNTERS; idx++) { event = dmc620_pmu->events[idx]; if (!event) continue; if (!(event->hw.state & PERF_HES_STOPPED)) dmc620_pmu_enable_counter(event); } ret = IRQ_HANDLED; } rcu_read_unlock(); return ret; } static struct dmc620_pmu_irq *__dmc620_pmu_get_irq(int irq_num) { struct dmc620_pmu_irq *irq; int ret; list_for_each_entry(irq, &dmc620_pmu_irqs, irqs_node) if (irq->irq_num == irq_num && refcount_inc_not_zero(&irq->refcount)) return irq; irq = kzalloc(sizeof(*irq), GFP_KERNEL); if (!irq) return ERR_PTR(-ENOMEM); INIT_LIST_HEAD(&irq->pmus_node); /* Pick one CPU to be the preferred one to use */ irq->cpu = raw_smp_processor_id(); refcount_set(&irq->refcount, 1); ret = request_irq(irq_num, dmc620_pmu_handle_irq, IRQF_NOBALANCING | IRQF_NO_THREAD, "dmc620-pmu", irq); if (ret) goto out_free_aff; ret = irq_set_affinity(irq_num, cpumask_of(irq->cpu)); if (ret) goto out_free_irq; ret = cpuhp_state_add_instance_nocalls(cpuhp_state_num, &irq->node); if (ret) goto out_free_irq; irq->irq_num = irq_num; list_add(&irq->irqs_node, &dmc620_pmu_irqs); return irq; out_free_irq: free_irq(irq_num, irq); out_free_aff: kfree(irq); return ERR_PTR(ret); } static int dmc620_pmu_get_irq(struct dmc620_pmu *dmc620_pmu, int irq_num) { struct dmc620_pmu_irq *irq; mutex_lock(&dmc620_pmu_irqs_lock); irq = __dmc620_pmu_get_irq(irq_num); mutex_unlock(&dmc620_pmu_irqs_lock); if (IS_ERR(irq)) return PTR_ERR(irq); dmc620_pmu->irq = irq; mutex_lock(&dmc620_pmu_node_lock); list_add_rcu(&dmc620_pmu->pmus_node, &irq->pmus_node); mutex_unlock(&dmc620_pmu_node_lock); return 0; } static void dmc620_pmu_put_irq(struct dmc620_pmu *dmc620_pmu) { struct dmc620_pmu_irq *irq = dmc620_pmu->irq; mutex_lock(&dmc620_pmu_node_lock); list_del_rcu(&dmc620_pmu->pmus_node); mutex_unlock(&dmc620_pmu_node_lock); mutex_lock(&dmc620_pmu_irqs_lock); if (!refcount_dec_and_test(&irq->refcount)) { mutex_unlock(&dmc620_pmu_irqs_lock); return; } list_del(&irq->irqs_node); mutex_unlock(&dmc620_pmu_irqs_lock); free_irq(irq->irq_num, irq); cpuhp_state_remove_instance_nocalls(cpuhp_state_num, &irq->node); kfree(irq); } static int dmc620_pmu_event_init(struct perf_event *event) { struct dmc620_pmu *dmc620_pmu = to_dmc620_pmu(event->pmu); struct hw_perf_event *hwc = &event->hw; struct perf_event *sibling; 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 -EOPNOTSUPP; } /* * 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 = dmc620_pmu->irq->cpu; if (event->cpu < 0) return -EINVAL; hwc->idx = -1; if (event->group_leader == event) return 0; /* * We can't atomically disable all HW counters so only one event allowed, * although software events are acceptable. */ if (!is_software_event(event->group_leader)) return -EINVAL; for_each_sibling_event(sibling, event->group_leader) { if (sibling != event && !is_software_event(sibling)) return -EINVAL; } return 0; } static void dmc620_pmu_read(struct perf_event *event) { dmc620_pmu_event_update(event); } static void dmc620_pmu_start(struct perf_event *event, int flags) { event->hw.state = 0; dmc620_pmu_event_set_period(event); dmc620_pmu_enable_counter(event); } static void dmc620_pmu_stop(struct perf_event *event, int flags) { if (event->hw.state & PERF_HES_STOPPED) return; dmc620_pmu_disable_counter(event); dmc620_pmu_event_update(event); event->hw.state |= PERF_HES_STOPPED | PERF_HES_UPTODATE; } static int dmc620_pmu_add(struct perf_event *event, int flags) { struct dmc620_pmu *dmc620_pmu = to_dmc620_pmu(event->pmu); struct perf_event_attr *attr = &event->attr; struct hw_perf_event *hwc = &event->hw; int idx; u64 reg; idx = dmc620_get_event_idx(event); if (idx < 0) return idx; hwc->idx = idx; dmc620_pmu->events[idx] = event; hwc->state = PERF_HES_STOPPED | PERF_HES_UPTODATE; reg = ATTR_CFG_GET_FLD(attr, mask); dmc620_pmu_creg_write(dmc620_pmu, idx, DMC620_PMU_COUNTERn_MASK_31_00, lower_32_bits(reg)); dmc620_pmu_creg_write(dmc620_pmu, idx, DMC620_PMU_COUNTERn_MASK_63_32, upper_32_bits(reg)); reg = ATTR_CFG_GET_FLD(attr, match); dmc620_pmu_creg_write(dmc620_pmu, idx, DMC620_PMU_COUNTERn_MATCH_31_00, lower_32_bits(reg)); dmc620_pmu_creg_write(dmc620_pmu, idx, DMC620_PMU_COUNTERn_MATCH_63_32, upper_32_bits(reg)); if (flags & PERF_EF_START) dmc620_pmu_start(event, PERF_EF_RELOAD); perf_event_update_userpage(event); return 0; } static void dmc620_pmu_del(struct perf_event *event, int flags) { struct dmc620_pmu *dmc620_pmu = to_dmc620_pmu(event->pmu); struct hw_perf_event *hwc = &event->hw; int idx = hwc->idx; dmc620_pmu_stop(event, PERF_EF_UPDATE); dmc620_pmu->events[idx] = NULL; clear_bit(idx, dmc620_pmu->used_mask); perf_event_update_userpage(event); } static int dmc620_pmu_cpu_teardown(unsigned int cpu, struct hlist_node *node) { struct dmc620_pmu_irq *irq; struct dmc620_pmu *dmc620_pmu; unsigned int target; irq = hlist_entry_safe(node, struct dmc620_pmu_irq, node); if (cpu != irq->cpu) return 0; target = cpumask_any_but(cpu_online_mask, cpu); if (target >= nr_cpu_ids) return 0; /* We're only reading, but this isn't the place to be involving RCU */ mutex_lock(&dmc620_pmu_node_lock); list_for_each_entry(dmc620_pmu, &irq->pmus_node, pmus_node) perf_pmu_migrate_context(&dmc620_pmu->pmu, irq->cpu, target); mutex_unlock(&dmc620_pmu_node_lock); WARN_ON(irq_set_affinity(irq->irq_num, cpumask_of(target))); irq->cpu = target; return 0; } static int dmc620_pmu_device_probe(struct platform_device *pdev) { struct dmc620_pmu *dmc620_pmu; struct resource *res; char *name; int irq_num; int i, ret; dmc620_pmu = devm_kzalloc(&pdev->dev, sizeof(struct dmc620_pmu), GFP_KERNEL); if (!dmc620_pmu) return -ENOMEM; platform_set_drvdata(pdev, dmc620_pmu); dmc620_pmu->pmu = (struct pmu) { .module = THIS_MODULE, .parent = &pdev->dev, .capabilities = PERF_PMU_CAP_NO_EXCLUDE, .task_ctx_nr = perf_invalid_context, .event_init = dmc620_pmu_event_init, .add = dmc620_pmu_add, .del = dmc620_pmu_del, .start = dmc620_pmu_start, .stop = dmc620_pmu_stop, .read = dmc620_pmu_read, .attr_groups = dmc620_pmu_attr_groups, }; dmc620_pmu->base = devm_platform_get_and_ioremap_resource(pdev, 0, &res); if (IS_ERR(dmc620_pmu->base)) return PTR_ERR(dmc620_pmu->base); /* Make sure device is reset before enabling interrupt */ for (i = 0; i < DMC620_PMU_MAX_COUNTERS; i++) dmc620_pmu_creg_write(dmc620_pmu, i, DMC620_PMU_COUNTERn_CONTROL, 0); writel(0, dmc620_pmu->base + DMC620_PMU_OVERFLOW_STATUS_CLKDIV2); writel(0, dmc620_pmu->base + DMC620_PMU_OVERFLOW_STATUS_CLK); irq_num = platform_get_irq(pdev, 0); if (irq_num < 0) return irq_num; ret = dmc620_pmu_get_irq(dmc620_pmu, irq_num); if (ret) return ret; name = devm_kasprintf(&pdev->dev, GFP_KERNEL, "%s_%llx", DMC620_PMUNAME, (u64)(res->start >> DMC620_PA_SHIFT)); if (!name) { dev_err(&pdev->dev, "Create name failed, PMU @%pa\n", &res->start); ret = -ENOMEM; goto out_teardown_dev; } ret = perf_pmu_register(&dmc620_pmu->pmu, name, -1); if (ret) goto out_teardown_dev; return 0; out_teardown_dev: dmc620_pmu_put_irq(dmc620_pmu); synchronize_rcu(); return ret; } static void dmc620_pmu_device_remove(struct platform_device *pdev) { struct dmc620_pmu *dmc620_pmu = platform_get_drvdata(pdev); dmc620_pmu_put_irq(dmc620_pmu); /* perf will synchronise RCU before devres can free dmc620_pmu */ perf_pmu_unregister(&dmc620_pmu->pmu); } static const struct acpi_device_id dmc620_acpi_match[] = { { "ARMHD620", 0}, {}, }; MODULE_DEVICE_TABLE(acpi, dmc620_acpi_match); static struct platform_driver dmc620_pmu_driver = { .driver = { .name = DMC620_DRVNAME, .acpi_match_table = dmc620_acpi_match, .suppress_bind_attrs = true, }, .probe = dmc620_pmu_device_probe, .remove_new = dmc620_pmu_device_remove, }; static int __init dmc620_pmu_init(void) { int ret; cpuhp_state_num = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, DMC620_DRVNAME, NULL, dmc620_pmu_cpu_teardown); if (cpuhp_state_num < 0) return cpuhp_state_num; ret = platform_driver_register(&dmc620_pmu_driver); if (ret) cpuhp_remove_multi_state(cpuhp_state_num); return ret; } static void __exit dmc620_pmu_exit(void) { platform_driver_unregister(&dmc620_pmu_driver); cpuhp_remove_multi_state(cpuhp_state_num); } module_init(dmc620_pmu_init); module_exit(dmc620_pmu_exit); MODULE_DESCRIPTION("Perf driver for the ARM DMC-620 memory controller"); MODULE_AUTHOR("Tuan Phan <tuanphan@os.amperecomputing.com"); MODULE_LICENSE("GPL v2");
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