| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Neil Leeder | 3254 | 85.07% | 1 | 12.50% |
| shameer | 363 | 9.49% | 2 | 25.00% |
| Robin Murphy | 201 | 5.25% | 2 | 25.00% |
| Yue haibing | 3 | 0.08% | 1 | 12.50% |
| Hanjun Guo | 3 | 0.08% | 1 | 12.50% |
| John Garry | 1 | 0.03% | 1 | 12.50% |
| Total | 3825 | 8 |
// SPDX-License-Identifier: GPL-2.0 /* * This driver adds support for perf events to use the Performance * Monitor Counter Groups (PMCG) associated with an SMMUv3 node * to monitor that node. * * SMMUv3 PMCG devices are named as smmuv3_pmcg_<phys_addr_page> where * <phys_addr_page> is the physical page address of the SMMU PMCG wrapped * to 4K boundary. For example, the PMCG at 0xff88840000 is named * smmuv3_pmcg_ff88840 * * Filtering by stream id is done by specifying filtering parameters * with the event. options are: * filter_enable - 0 = no filtering, 1 = filtering enabled * filter_span - 0 = exact match, 1 = pattern match * filter_stream_id - pattern to filter against * * To match a partial StreamID where the X most-significant bits must match * but the Y least-significant bits might differ, STREAMID is programmed * with a value that contains: * STREAMID[Y - 1] == 0. * STREAMID[Y - 2:0] == 1 (where Y > 1). * The remainder of implemented bits of STREAMID (X bits, from bit Y upwards) * contain a value to match from the corresponding bits of event StreamID. * * Example: perf stat -e smmuv3_pmcg_ff88840/transaction,filter_enable=1, * filter_span=1,filter_stream_id=0x42/ -a netperf * Applies filter pattern 0x42 to transaction events, which means events * matching stream ids 0x42 and 0x43 are counted. Further filtering * information is available in the SMMU documentation. * * SMMU events are not attributable to a CPU, so task mode and sampling * are not supported. */ #include <linux/acpi.h> #include <linux/acpi_iort.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/msi.h> #include <linux/perf_event.h> #include <linux/platform_device.h> #include <linux/smp.h> #include <linux/sysfs.h> #include <linux/types.h> #define SMMU_PMCG_EVCNTR0 0x0 #define SMMU_PMCG_EVCNTR(n, stride) (SMMU_PMCG_EVCNTR0 + (n) * (stride)) #define SMMU_PMCG_EVTYPER0 0x400 #define SMMU_PMCG_EVTYPER(n) (SMMU_PMCG_EVTYPER0 + (n) * 4) #define SMMU_PMCG_SID_SPAN_SHIFT 29 #define SMMU_PMCG_SMR0 0xA00 #define SMMU_PMCG_SMR(n) (SMMU_PMCG_SMR0 + (n) * 4) #define SMMU_PMCG_CNTENSET0 0xC00 #define SMMU_PMCG_CNTENCLR0 0xC20 #define SMMU_PMCG_INTENSET0 0xC40 #define SMMU_PMCG_INTENCLR0 0xC60 #define SMMU_PMCG_OVSCLR0 0xC80 #define SMMU_PMCG_OVSSET0 0xCC0 #define SMMU_PMCG_CFGR 0xE00 #define SMMU_PMCG_CFGR_SID_FILTER_TYPE BIT(23) #define SMMU_PMCG_CFGR_MSI BIT(21) #define SMMU_PMCG_CFGR_RELOC_CTRS BIT(20) #define SMMU_PMCG_CFGR_SIZE GENMASK(13, 8) #define SMMU_PMCG_CFGR_NCTR GENMASK(5, 0) #define SMMU_PMCG_CR 0xE04 #define SMMU_PMCG_CR_ENABLE BIT(0) #define SMMU_PMCG_CEID0 0xE20 #define SMMU_PMCG_CEID1 0xE28 #define SMMU_PMCG_IRQ_CTRL 0xE50 #define SMMU_PMCG_IRQ_CTRL_IRQEN BIT(0) #define SMMU_PMCG_IRQ_CFG0 0xE58 #define SMMU_PMCG_IRQ_CFG1 0xE60 #define SMMU_PMCG_IRQ_CFG2 0xE64 /* MSI config fields */ #define MSI_CFG0_ADDR_MASK GENMASK_ULL(51, 2) #define MSI_CFG2_MEMATTR_DEVICE_nGnRE 0x1 #define SMMU_PMCG_DEFAULT_FILTER_SPAN 1 #define SMMU_PMCG_DEFAULT_FILTER_SID GENMASK(31, 0) #define SMMU_PMCG_MAX_COUNTERS 64 #define SMMU_PMCG_ARCH_MAX_EVENTS 128 #define SMMU_PMCG_PA_SHIFT 12 #define SMMU_PMCG_EVCNTR_RDONLY BIT(0) static int cpuhp_state_num; struct smmu_pmu { struct hlist_node node; struct perf_event *events[SMMU_PMCG_MAX_COUNTERS]; DECLARE_BITMAP(used_counters, SMMU_PMCG_MAX_COUNTERS); DECLARE_BITMAP(supported_events, SMMU_PMCG_ARCH_MAX_EVENTS); unsigned int irq; unsigned int on_cpu; struct pmu pmu; unsigned int num_counters; struct device *dev; void __iomem *reg_base; void __iomem *reloc_base; u64 counter_mask; u32 options; bool global_filter; }; #define to_smmu_pmu(p) (container_of(p, struct smmu_pmu, pmu)) #define SMMU_PMU_EVENT_ATTR_EXTRACTOR(_name, _config, _start, _end) \ static inline u32 get_##_name(struct perf_event *event) \ { \ return FIELD_GET(GENMASK_ULL(_end, _start), \ event->attr._config); \ } \ SMMU_PMU_EVENT_ATTR_EXTRACTOR(event, config, 0, 15); SMMU_PMU_EVENT_ATTR_EXTRACTOR(filter_stream_id, config1, 0, 31); SMMU_PMU_EVENT_ATTR_EXTRACTOR(filter_span, config1, 32, 32); SMMU_PMU_EVENT_ATTR_EXTRACTOR(filter_enable, config1, 33, 33); static inline void smmu_pmu_enable(struct pmu *pmu) { struct smmu_pmu *smmu_pmu = to_smmu_pmu(pmu); writel(SMMU_PMCG_IRQ_CTRL_IRQEN, smmu_pmu->reg_base + SMMU_PMCG_IRQ_CTRL); writel(SMMU_PMCG_CR_ENABLE, smmu_pmu->reg_base + SMMU_PMCG_CR); } static inline void smmu_pmu_disable(struct pmu *pmu) { struct smmu_pmu *smmu_pmu = to_smmu_pmu(pmu); writel(0, smmu_pmu->reg_base + SMMU_PMCG_CR); writel(0, smmu_pmu->reg_base + SMMU_PMCG_IRQ_CTRL); } static inline void smmu_pmu_counter_set_value(struct smmu_pmu *smmu_pmu, u32 idx, u64 value) { if (smmu_pmu->counter_mask & BIT(32)) writeq(value, smmu_pmu->reloc_base + SMMU_PMCG_EVCNTR(idx, 8)); else writel(value, smmu_pmu->reloc_base + SMMU_PMCG_EVCNTR(idx, 4)); } static inline u64 smmu_pmu_counter_get_value(struct smmu_pmu *smmu_pmu, u32 idx) { u64 value; if (smmu_pmu->counter_mask & BIT(32)) value = readq(smmu_pmu->reloc_base + SMMU_PMCG_EVCNTR(idx, 8)); else value = readl(smmu_pmu->reloc_base + SMMU_PMCG_EVCNTR(idx, 4)); return value; } static inline void smmu_pmu_counter_enable(struct smmu_pmu *smmu_pmu, u32 idx) { writeq(BIT(idx), smmu_pmu->reg_base + SMMU_PMCG_CNTENSET0); } static inline void smmu_pmu_counter_disable(struct smmu_pmu *smmu_pmu, u32 idx) { writeq(BIT(idx), smmu_pmu->reg_base + SMMU_PMCG_CNTENCLR0); } static inline void smmu_pmu_interrupt_enable(struct smmu_pmu *smmu_pmu, u32 idx) { writeq(BIT(idx), smmu_pmu->reg_base + SMMU_PMCG_INTENSET0); } static inline void smmu_pmu_interrupt_disable(struct smmu_pmu *smmu_pmu, u32 idx) { writeq(BIT(idx), smmu_pmu->reg_base + SMMU_PMCG_INTENCLR0); } static inline void smmu_pmu_set_evtyper(struct smmu_pmu *smmu_pmu, u32 idx, u32 val) { writel(val, smmu_pmu->reg_base + SMMU_PMCG_EVTYPER(idx)); } static inline void smmu_pmu_set_smr(struct smmu_pmu *smmu_pmu, u32 idx, u32 val) { writel(val, smmu_pmu->reg_base + SMMU_PMCG_SMR(idx)); } static void smmu_pmu_event_update(struct perf_event *event) { struct hw_perf_event *hwc = &event->hw; struct smmu_pmu *smmu_pmu = to_smmu_pmu(event->pmu); u64 delta, prev, now; u32 idx = hwc->idx; do { prev = local64_read(&hwc->prev_count); now = smmu_pmu_counter_get_value(smmu_pmu, idx); } while (local64_cmpxchg(&hwc->prev_count, prev, now) != prev); /* handle overflow. */ delta = now - prev; delta &= smmu_pmu->counter_mask; local64_add(delta, &event->count); } static void smmu_pmu_set_period(struct smmu_pmu *smmu_pmu, struct hw_perf_event *hwc) { u32 idx = hwc->idx; u64 new; if (smmu_pmu->options & SMMU_PMCG_EVCNTR_RDONLY) { /* * On platforms that require this quirk, if the counter starts * at < half_counter value and wraps, the current logic of * handling the overflow may not work. It is expected that, * those platforms will have full 64 counter bits implemented * so that such a possibility is remote(eg: HiSilicon HIP08). */ new = smmu_pmu_counter_get_value(smmu_pmu, idx); } else { /* * We limit the max period to half the max counter value * of the counter size, so that even in the case of extreme * interrupt latency the counter will (hopefully) not wrap * past its initial value. */ new = smmu_pmu->counter_mask >> 1; smmu_pmu_counter_set_value(smmu_pmu, idx, new); } local64_set(&hwc->prev_count, new); } static void smmu_pmu_set_event_filter(struct perf_event *event, int idx, u32 span, u32 sid) { struct smmu_pmu *smmu_pmu = to_smmu_pmu(event->pmu); u32 evtyper; evtyper = get_event(event) | span << SMMU_PMCG_SID_SPAN_SHIFT; smmu_pmu_set_evtyper(smmu_pmu, idx, evtyper); smmu_pmu_set_smr(smmu_pmu, idx, sid); } static bool smmu_pmu_check_global_filter(struct perf_event *curr, struct perf_event *new) { if (get_filter_enable(new) != get_filter_enable(curr)) return false; if (!get_filter_enable(new)) return true; return get_filter_span(new) == get_filter_span(curr) && get_filter_stream_id(new) == get_filter_stream_id(curr); } static int smmu_pmu_apply_event_filter(struct smmu_pmu *smmu_pmu, struct perf_event *event, int idx) { u32 span, sid; unsigned int num_ctrs = smmu_pmu->num_counters; bool filter_en = !!get_filter_enable(event); span = filter_en ? get_filter_span(event) : SMMU_PMCG_DEFAULT_FILTER_SPAN; sid = filter_en ? get_filter_stream_id(event) : SMMU_PMCG_DEFAULT_FILTER_SID; /* Support individual filter settings */ if (!smmu_pmu->global_filter) { smmu_pmu_set_event_filter(event, idx, span, sid); return 0; } /* Requested settings same as current global settings*/ idx = find_first_bit(smmu_pmu->used_counters, num_ctrs); if (idx == num_ctrs || smmu_pmu_check_global_filter(smmu_pmu->events[idx], event)) { smmu_pmu_set_event_filter(event, 0, span, sid); return 0; } return -EAGAIN; } static int smmu_pmu_get_event_idx(struct smmu_pmu *smmu_pmu, struct perf_event *event) { int idx, err; unsigned int num_ctrs = smmu_pmu->num_counters; idx = find_first_zero_bit(smmu_pmu->used_counters, num_ctrs); if (idx == num_ctrs) /* The counters are all in use. */ return -EAGAIN; err = smmu_pmu_apply_event_filter(smmu_pmu, event, idx); if (err) return err; set_bit(idx, smmu_pmu->used_counters); return idx; } static bool smmu_pmu_events_compatible(struct perf_event *curr, struct perf_event *new) { if (new->pmu != curr->pmu) return false; if (to_smmu_pmu(new->pmu)->global_filter && !smmu_pmu_check_global_filter(curr, new)) return false; return true; } /* * Implementation of abstract pmu functionality required by * the core perf events code. */ static int smmu_pmu_event_init(struct perf_event *event) { struct hw_perf_event *hwc = &event->hw; struct smmu_pmu *smmu_pmu = to_smmu_pmu(event->pmu); struct device *dev = smmu_pmu->dev; struct perf_event *sibling; int group_num_events = 1; u16 event_id; if (event->attr.type != event->pmu->type) return -ENOENT; if (hwc->sample_period) { dev_dbg(dev, "Sampling not supported\n"); return -EOPNOTSUPP; } if (event->cpu < 0) { dev_dbg(dev, "Per-task mode not supported\n"); return -EOPNOTSUPP; } /* Verify specified event is supported on this PMU */ event_id = get_event(event); if (event_id < SMMU_PMCG_ARCH_MAX_EVENTS && (!test_bit(event_id, smmu_pmu->supported_events))) { dev_dbg(dev, "Invalid event %d for this PMU\n", event_id); return -EINVAL; } /* Don't allow groups with mixed PMUs, except for s/w events */ if (!is_software_event(event->group_leader)) { if (!smmu_pmu_events_compatible(event->group_leader, event)) return -EINVAL; if (++group_num_events > smmu_pmu->num_counters) return -EINVAL; } for_each_sibling_event(sibling, event->group_leader) { if (is_software_event(sibling)) continue; if (!smmu_pmu_events_compatible(sibling, event)) return -EINVAL; if (++group_num_events > smmu_pmu->num_counters) return -EINVAL; } hwc->idx = -1; /* * Ensure all events are on the same cpu so all events are in the * same cpu context, to avoid races on pmu_enable etc. */ event->cpu = smmu_pmu->on_cpu; return 0; } static void smmu_pmu_event_start(struct perf_event *event, int flags) { struct smmu_pmu *smmu_pmu = to_smmu_pmu(event->pmu); struct hw_perf_event *hwc = &event->hw; int idx = hwc->idx; hwc->state = 0; smmu_pmu_set_period(smmu_pmu, hwc); smmu_pmu_counter_enable(smmu_pmu, idx); } static void smmu_pmu_event_stop(struct perf_event *event, int flags) { struct smmu_pmu *smmu_pmu = to_smmu_pmu(event->pmu); struct hw_perf_event *hwc = &event->hw; int idx = hwc->idx; if (hwc->state & PERF_HES_STOPPED) return; smmu_pmu_counter_disable(smmu_pmu, idx); /* As the counter gets updated on _start, ignore PERF_EF_UPDATE */ smmu_pmu_event_update(event); hwc->state |= PERF_HES_STOPPED | PERF_HES_UPTODATE; } static int smmu_pmu_event_add(struct perf_event *event, int flags) { struct hw_perf_event *hwc = &event->hw; int idx; struct smmu_pmu *smmu_pmu = to_smmu_pmu(event->pmu); idx = smmu_pmu_get_event_idx(smmu_pmu, event); if (idx < 0) return idx; hwc->idx = idx; hwc->state = PERF_HES_STOPPED | PERF_HES_UPTODATE; smmu_pmu->events[idx] = event; local64_set(&hwc->prev_count, 0); smmu_pmu_interrupt_enable(smmu_pmu, idx); if (flags & PERF_EF_START) smmu_pmu_event_start(event, flags); /* Propagate changes to the userspace mapping. */ perf_event_update_userpage(event); return 0; } static void smmu_pmu_event_del(struct perf_event *event, int flags) { struct hw_perf_event *hwc = &event->hw; struct smmu_pmu *smmu_pmu = to_smmu_pmu(event->pmu); int idx = hwc->idx; smmu_pmu_event_stop(event, flags | PERF_EF_UPDATE); smmu_pmu_interrupt_disable(smmu_pmu, idx); smmu_pmu->events[idx] = NULL; clear_bit(idx, smmu_pmu->used_counters); perf_event_update_userpage(event); } static void smmu_pmu_event_read(struct perf_event *event) { smmu_pmu_event_update(event); } /* cpumask */ static ssize_t smmu_pmu_cpumask_show(struct device *dev, struct device_attribute *attr, char *buf) { struct smmu_pmu *smmu_pmu = to_smmu_pmu(dev_get_drvdata(dev)); return cpumap_print_to_pagebuf(true, buf, cpumask_of(smmu_pmu->on_cpu)); } static struct device_attribute smmu_pmu_cpumask_attr = __ATTR(cpumask, 0444, smmu_pmu_cpumask_show, NULL); static struct attribute *smmu_pmu_cpumask_attrs[] = { &smmu_pmu_cpumask_attr.attr, NULL }; static struct attribute_group smmu_pmu_cpumask_group = { .attrs = smmu_pmu_cpumask_attrs, }; /* Events */ static ssize_t smmu_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 sprintf(page, "event=0x%02llx\n", pmu_attr->id); } #define SMMU_EVENT_ATTR(name, config) \ PMU_EVENT_ATTR(name, smmu_event_attr_##name, \ config, smmu_pmu_event_show) SMMU_EVENT_ATTR(cycles, 0); SMMU_EVENT_ATTR(transaction, 1); SMMU_EVENT_ATTR(tlb_miss, 2); SMMU_EVENT_ATTR(config_cache_miss, 3); SMMU_EVENT_ATTR(trans_table_walk_access, 4); SMMU_EVENT_ATTR(config_struct_access, 5); SMMU_EVENT_ATTR(pcie_ats_trans_rq, 6); SMMU_EVENT_ATTR(pcie_ats_trans_passed, 7); static struct attribute *smmu_pmu_events[] = { &smmu_event_attr_cycles.attr.attr, &smmu_event_attr_transaction.attr.attr, &smmu_event_attr_tlb_miss.attr.attr, &smmu_event_attr_config_cache_miss.attr.attr, &smmu_event_attr_trans_table_walk_access.attr.attr, &smmu_event_attr_config_struct_access.attr.attr, &smmu_event_attr_pcie_ats_trans_rq.attr.attr, &smmu_event_attr_pcie_ats_trans_passed.attr.attr, NULL }; static umode_t smmu_pmu_event_is_visible(struct kobject *kobj, struct attribute *attr, int unused) { struct device *dev = kobj_to_dev(kobj); struct smmu_pmu *smmu_pmu = to_smmu_pmu(dev_get_drvdata(dev)); struct perf_pmu_events_attr *pmu_attr; pmu_attr = container_of(attr, struct perf_pmu_events_attr, attr.attr); if (test_bit(pmu_attr->id, smmu_pmu->supported_events)) return attr->mode; return 0; } static struct attribute_group smmu_pmu_events_group = { .name = "events", .attrs = smmu_pmu_events, .is_visible = smmu_pmu_event_is_visible, }; /* Formats */ PMU_FORMAT_ATTR(event, "config:0-15"); PMU_FORMAT_ATTR(filter_stream_id, "config1:0-31"); PMU_FORMAT_ATTR(filter_span, "config1:32"); PMU_FORMAT_ATTR(filter_enable, "config1:33"); static struct attribute *smmu_pmu_formats[] = { &format_attr_event.attr, &format_attr_filter_stream_id.attr, &format_attr_filter_span.attr, &format_attr_filter_enable.attr, NULL }; static struct attribute_group smmu_pmu_format_group = { .name = "format", .attrs = smmu_pmu_formats, }; static const struct attribute_group *smmu_pmu_attr_grps[] = { &smmu_pmu_cpumask_group, &smmu_pmu_events_group, &smmu_pmu_format_group, NULL }; /* * Generic device handlers */ static int smmu_pmu_offline_cpu(unsigned int cpu, struct hlist_node *node) { struct smmu_pmu *smmu_pmu; unsigned int target; smmu_pmu = hlist_entry_safe(node, struct smmu_pmu, node); if (cpu != smmu_pmu->on_cpu) return 0; target = cpumask_any_but(cpu_online_mask, cpu); if (target >= nr_cpu_ids) return 0; perf_pmu_migrate_context(&smmu_pmu->pmu, cpu, target); smmu_pmu->on_cpu = target; WARN_ON(irq_set_affinity_hint(smmu_pmu->irq, cpumask_of(target))); return 0; } static irqreturn_t smmu_pmu_handle_irq(int irq_num, void *data) { struct smmu_pmu *smmu_pmu = data; u64 ovsr; unsigned int idx; ovsr = readq(smmu_pmu->reloc_base + SMMU_PMCG_OVSSET0); if (!ovsr) return IRQ_NONE; writeq(ovsr, smmu_pmu->reloc_base + SMMU_PMCG_OVSCLR0); for_each_set_bit(idx, (unsigned long *)&ovsr, smmu_pmu->num_counters) { struct perf_event *event = smmu_pmu->events[idx]; struct hw_perf_event *hwc; if (WARN_ON_ONCE(!event)) continue; smmu_pmu_event_update(event); hwc = &event->hw; smmu_pmu_set_period(smmu_pmu, hwc); } return IRQ_HANDLED; } static void smmu_pmu_free_msis(void *data) { struct device *dev = data; platform_msi_domain_free_irqs(dev); } static void smmu_pmu_write_msi_msg(struct msi_desc *desc, struct msi_msg *msg) { phys_addr_t doorbell; struct device *dev = msi_desc_to_dev(desc); struct smmu_pmu *pmu = dev_get_drvdata(dev); doorbell = (((u64)msg->address_hi) << 32) | msg->address_lo; doorbell &= MSI_CFG0_ADDR_MASK; writeq_relaxed(doorbell, pmu->reg_base + SMMU_PMCG_IRQ_CFG0); writel_relaxed(msg->data, pmu->reg_base + SMMU_PMCG_IRQ_CFG1); writel_relaxed(MSI_CFG2_MEMATTR_DEVICE_nGnRE, pmu->reg_base + SMMU_PMCG_IRQ_CFG2); } static void smmu_pmu_setup_msi(struct smmu_pmu *pmu) { struct msi_desc *desc; struct device *dev = pmu->dev; int ret; /* Clear MSI address reg */ writeq_relaxed(0, pmu->reg_base + SMMU_PMCG_IRQ_CFG0); /* MSI supported or not */ if (!(readl(pmu->reg_base + SMMU_PMCG_CFGR) & SMMU_PMCG_CFGR_MSI)) return; ret = platform_msi_domain_alloc_irqs(dev, 1, smmu_pmu_write_msi_msg); if (ret) { dev_warn(dev, "failed to allocate MSIs\n"); return; } desc = first_msi_entry(dev); if (desc) pmu->irq = desc->irq; /* Add callback to free MSIs on teardown */ devm_add_action(dev, smmu_pmu_free_msis, dev); } static int smmu_pmu_setup_irq(struct smmu_pmu *pmu) { unsigned long flags = IRQF_NOBALANCING | IRQF_SHARED | IRQF_NO_THREAD; int irq, ret = -ENXIO; smmu_pmu_setup_msi(pmu); irq = pmu->irq; if (irq) ret = devm_request_irq(pmu->dev, irq, smmu_pmu_handle_irq, flags, "smmuv3-pmu", pmu); return ret; } static void smmu_pmu_reset(struct smmu_pmu *smmu_pmu) { u64 counter_present_mask = GENMASK_ULL(smmu_pmu->num_counters - 1, 0); smmu_pmu_disable(&smmu_pmu->pmu); /* Disable counter and interrupt */ writeq_relaxed(counter_present_mask, smmu_pmu->reg_base + SMMU_PMCG_CNTENCLR0); writeq_relaxed(counter_present_mask, smmu_pmu->reg_base + SMMU_PMCG_INTENCLR0); writeq_relaxed(counter_present_mask, smmu_pmu->reloc_base + SMMU_PMCG_OVSCLR0); } static void smmu_pmu_get_acpi_options(struct smmu_pmu *smmu_pmu) { u32 model; model = *(u32 *)dev_get_platdata(smmu_pmu->dev); switch (model) { case IORT_SMMU_V3_PMCG_HISI_HIP08: /* HiSilicon Erratum 162001800 */ smmu_pmu->options |= SMMU_PMCG_EVCNTR_RDONLY; break; } dev_notice(smmu_pmu->dev, "option mask 0x%x\n", smmu_pmu->options); } static int smmu_pmu_probe(struct platform_device *pdev) { struct smmu_pmu *smmu_pmu; struct resource *res_0; u32 cfgr, reg_size; u64 ceid_64[2]; int irq, err; char *name; struct device *dev = &pdev->dev; smmu_pmu = devm_kzalloc(dev, sizeof(*smmu_pmu), GFP_KERNEL); if (!smmu_pmu) return -ENOMEM; smmu_pmu->dev = dev; platform_set_drvdata(pdev, smmu_pmu); smmu_pmu->pmu = (struct pmu) { .task_ctx_nr = perf_invalid_context, .pmu_enable = smmu_pmu_enable, .pmu_disable = smmu_pmu_disable, .event_init = smmu_pmu_event_init, .add = smmu_pmu_event_add, .del = smmu_pmu_event_del, .start = smmu_pmu_event_start, .stop = smmu_pmu_event_stop, .read = smmu_pmu_event_read, .attr_groups = smmu_pmu_attr_grps, .capabilities = PERF_PMU_CAP_NO_EXCLUDE, }; res_0 = platform_get_resource(pdev, IORESOURCE_MEM, 0); smmu_pmu->reg_base = devm_ioremap_resource(dev, res_0); if (IS_ERR(smmu_pmu->reg_base)) return PTR_ERR(smmu_pmu->reg_base); cfgr = readl_relaxed(smmu_pmu->reg_base + SMMU_PMCG_CFGR); /* Determine if page 1 is present */ if (cfgr & SMMU_PMCG_CFGR_RELOC_CTRS) { smmu_pmu->reloc_base = devm_platform_ioremap_resource(pdev, 1); if (IS_ERR(smmu_pmu->reloc_base)) return PTR_ERR(smmu_pmu->reloc_base); } else { smmu_pmu->reloc_base = smmu_pmu->reg_base; } irq = platform_get_irq_optional(pdev, 0); if (irq > 0) smmu_pmu->irq = irq; ceid_64[0] = readq_relaxed(smmu_pmu->reg_base + SMMU_PMCG_CEID0); ceid_64[1] = readq_relaxed(smmu_pmu->reg_base + SMMU_PMCG_CEID1); bitmap_from_arr32(smmu_pmu->supported_events, (u32 *)ceid_64, SMMU_PMCG_ARCH_MAX_EVENTS); smmu_pmu->num_counters = FIELD_GET(SMMU_PMCG_CFGR_NCTR, cfgr) + 1; smmu_pmu->global_filter = !!(cfgr & SMMU_PMCG_CFGR_SID_FILTER_TYPE); reg_size = FIELD_GET(SMMU_PMCG_CFGR_SIZE, cfgr); smmu_pmu->counter_mask = GENMASK_ULL(reg_size, 0); smmu_pmu_reset(smmu_pmu); err = smmu_pmu_setup_irq(smmu_pmu); if (err) { dev_err(dev, "Setup irq failed, PMU @%pa\n", &res_0->start); return err; } name = devm_kasprintf(&pdev->dev, GFP_KERNEL, "smmuv3_pmcg_%llx", (res_0->start) >> SMMU_PMCG_PA_SHIFT); if (!name) { dev_err(dev, "Create name failed, PMU @%pa\n", &res_0->start); return -EINVAL; } smmu_pmu_get_acpi_options(smmu_pmu); /* Pick one CPU to be the preferred one to use */ smmu_pmu->on_cpu = raw_smp_processor_id(); WARN_ON(irq_set_affinity_hint(smmu_pmu->irq, cpumask_of(smmu_pmu->on_cpu))); err = cpuhp_state_add_instance_nocalls(cpuhp_state_num, &smmu_pmu->node); if (err) { dev_err(dev, "Error %d registering hotplug, PMU @%pa\n", err, &res_0->start); return err; } err = perf_pmu_register(&smmu_pmu->pmu, name, -1); if (err) { dev_err(dev, "Error %d registering PMU @%pa\n", err, &res_0->start); goto out_unregister; } dev_info(dev, "Registered PMU @ %pa using %d counters with %s filter settings\n", &res_0->start, smmu_pmu->num_counters, smmu_pmu->global_filter ? "Global(Counter0)" : "Individual"); return 0; out_unregister: cpuhp_state_remove_instance_nocalls(cpuhp_state_num, &smmu_pmu->node); return err; } static int smmu_pmu_remove(struct platform_device *pdev) { struct smmu_pmu *smmu_pmu = platform_get_drvdata(pdev); perf_pmu_unregister(&smmu_pmu->pmu); cpuhp_state_remove_instance_nocalls(cpuhp_state_num, &smmu_pmu->node); return 0; } static void smmu_pmu_shutdown(struct platform_device *pdev) { struct smmu_pmu *smmu_pmu = platform_get_drvdata(pdev); smmu_pmu_disable(&smmu_pmu->pmu); } static struct platform_driver smmu_pmu_driver = { .driver = { .name = "arm-smmu-v3-pmcg", }, .probe = smmu_pmu_probe, .remove = smmu_pmu_remove, .shutdown = smmu_pmu_shutdown, }; static int __init arm_smmu_pmu_init(void) { cpuhp_state_num = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "perf/arm/pmcg:online", NULL, smmu_pmu_offline_cpu); if (cpuhp_state_num < 0) return cpuhp_state_num; return platform_driver_register(&smmu_pmu_driver); } module_init(arm_smmu_pmu_init); static void __exit arm_smmu_pmu_exit(void) { platform_driver_unregister(&smmu_pmu_driver); cpuhp_remove_multi_state(cpuhp_state_num); } module_exit(arm_smmu_pmu_exit); MODULE_DESCRIPTION("PMU driver for ARM SMMUv3 Performance Monitors Extension"); MODULE_AUTHOR("Neil Leeder <nleeder@codeaurora.org>"); MODULE_AUTHOR("Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>"); MODULE_LICENSE("GPL v2");
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