/* * HiSilicon SoC L3C uncore Hardware event counters support * * Copyright (C) 2017 Hisilicon Limited * Author: Anurup M <anurup.m@huawei.com> * Shaokun Zhang <zhangshaokun@hisilicon.com> * * This code is based on the uncore PMUs like arm-cci and arm-ccn. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #include <linux/acpi.h> #include <linux/bug.h> #include <linux/cpuhotplug.h> #include <linux/interrupt.h> #include <linux/irq.h> #include <linux/list.h> #include <linux/platform_device.h> #include <linux/smp.h> #include "hisi_uncore_pmu.h" /* L3C register definition */ #define L3C_PERF_CTRL 0x0408 #define L3C_INT_MASK 0x0800 #define L3C_INT_STATUS 0x0808 #define L3C_INT_CLEAR 0x080c #define L3C_EVENT_CTRL 0x1c00 #define L3C_EVENT_TYPE0 0x1d00 /* * Each counter is 48-bits and [48:63] are reserved * which are Read-As-Zero and Writes-Ignored. */ #define L3C_CNTR0_LOWER 0x1e00 /* L3C has 8-counters */ #define L3C_NR_COUNTERS 0x8 #define L3C_PERF_CTRL_EN 0x20000 #define L3C_EVTYPE_NONE 0xff /* * Select the counter register offset using the counter index */ static u32 hisi_l3c_pmu_get_counter_offset(int cntr_idx) { return (L3C_CNTR0_LOWER + (cntr_idx * 8)); } static u64 hisi_l3c_pmu_read_counter(struct hisi_pmu *l3c_pmu, struct hw_perf_event *hwc) { u32 idx = hwc->idx; if (!hisi_uncore_pmu_counter_valid(l3c_pmu, idx)) { dev_err(l3c_pmu->dev, "Unsupported event index:%d!\n", idx); return 0; } /* Read 64-bits and the upper 16 bits are RAZ */ return readq(l3c_pmu->base + hisi_l3c_pmu_get_counter_offset(idx)); } static void hisi_l3c_pmu_write_counter(struct hisi_pmu *l3c_pmu, struct hw_perf_event *hwc, u64 val) { u32 idx = hwc->idx; if (!hisi_uncore_pmu_counter_valid(l3c_pmu, idx)) { dev_err(l3c_pmu->dev, "Unsupported event index:%d!\n", idx); return; } /* Write 64-bits and the upper 16 bits are WI */ writeq(val, l3c_pmu->base + hisi_l3c_pmu_get_counter_offset(idx)); } static void hisi_l3c_pmu_write_evtype(struct hisi_pmu *l3c_pmu, int idx, u32 type) { u32 reg, reg_idx, shift, val; /* * Select the appropriate event select register(L3C_EVENT_TYPE0/1). * There are 2 event select registers for the 8 hardware counters. * Event code is 8-bits and for the former 4 hardware counters, * L3C_EVENT_TYPE0 is chosen. For the latter 4 hardware counters, * L3C_EVENT_TYPE1 is chosen. */ reg = L3C_EVENT_TYPE0 + (idx / 4) * 4; reg_idx = idx % 4; shift = 8 * reg_idx; /* Write event code to L3C_EVENT_TYPEx Register */ val = readl(l3c_pmu->base + reg); val &= ~(L3C_EVTYPE_NONE << shift); val |= (type << shift); writel(val, l3c_pmu->base + reg); } static void hisi_l3c_pmu_start_counters(struct hisi_pmu *l3c_pmu) { u32 val; /* * Set perf_enable bit in L3C_PERF_CTRL register to start counting * for all enabled counters. */ val = readl(l3c_pmu->base + L3C_PERF_CTRL); val |= L3C_PERF_CTRL_EN; writel(val, l3c_pmu->base + L3C_PERF_CTRL); } static void hisi_l3c_pmu_stop_counters(struct hisi_pmu *l3c_pmu) { u32 val; /* * Clear perf_enable bit in L3C_PERF_CTRL register to stop counting * for all enabled counters. */ val = readl(l3c_pmu->base + L3C_PERF_CTRL); val &= ~(L3C_PERF_CTRL_EN); writel(val, l3c_pmu->base + L3C_PERF_CTRL); } static void hisi_l3c_pmu_enable_counter(struct hisi_pmu *l3c_pmu, struct hw_perf_event *hwc) { u32 val; /* Enable counter index in L3C_EVENT_CTRL register */ val = readl(l3c_pmu->base + L3C_EVENT_CTRL); val |= (1 << hwc->idx); writel(val, l3c_pmu->base + L3C_EVENT_CTRL); } static void hisi_l3c_pmu_disable_counter(struct hisi_pmu *l3c_pmu, struct hw_perf_event *hwc) { u32 val; /* Clear counter index in L3C_EVENT_CTRL register */ val = readl(l3c_pmu->base + L3C_EVENT_CTRL); val &= ~(1 << hwc->idx); writel(val, l3c_pmu->base + L3C_EVENT_CTRL); } static void hisi_l3c_pmu_enable_counter_int(struct hisi_pmu *l3c_pmu, struct hw_perf_event *hwc) { u32 val; val = readl(l3c_pmu->base + L3C_INT_MASK); /* Write 0 to enable interrupt */ val &= ~(1 << hwc->idx); writel(val, l3c_pmu->base + L3C_INT_MASK); } static void hisi_l3c_pmu_disable_counter_int(struct hisi_pmu *l3c_pmu, struct hw_perf_event *hwc) { u32 val; val = readl(l3c_pmu->base + L3C_INT_MASK); /* Write 1 to mask interrupt */ val |= (1 << hwc->idx); writel(val, l3c_pmu->base + L3C_INT_MASK); } static irqreturn_t hisi_l3c_pmu_isr(int irq, void *dev_id) { struct hisi_pmu *l3c_pmu = dev_id; struct perf_event *event; unsigned long overflown; int idx; /* Read L3C_INT_STATUS register */ overflown = readl(l3c_pmu->base + L3C_INT_STATUS); if (!overflown) return IRQ_NONE; /* * Find the counter index which overflowed if the bit was set * and handle it. */ for_each_set_bit(idx, &overflown, L3C_NR_COUNTERS) { /* Write 1 to clear the IRQ status flag */ writel((1 << idx), l3c_pmu->base + L3C_INT_CLEAR); /* Get the corresponding event struct */ event = l3c_pmu->pmu_events.hw_events[idx]; if (!event) continue; hisi_uncore_pmu_event_update(event); hisi_uncore_pmu_set_event_period(event); } return IRQ_HANDLED; } static int hisi_l3c_pmu_init_irq(struct hisi_pmu *l3c_pmu, struct platform_device *pdev) { int irq, ret; /* Read and init IRQ */ irq = platform_get_irq(pdev, 0); if (irq < 0) { dev_err(&pdev->dev, "L3C PMU get irq fail; irq:%d\n", irq); return irq; } ret = devm_request_irq(&pdev->dev, irq, hisi_l3c_pmu_isr, IRQF_NOBALANCING | IRQF_NO_THREAD, dev_name(&pdev->dev), l3c_pmu); if (ret < 0) { dev_err(&pdev->dev, "Fail to request IRQ:%d ret:%d\n", irq, ret); return ret; } l3c_pmu->irq = irq; return 0; } static const struct acpi_device_id hisi_l3c_pmu_acpi_match[] = { { "HISI0213", }, {}, }; MODULE_DEVICE_TABLE(acpi, hisi_l3c_pmu_acpi_match); static int hisi_l3c_pmu_init_data(struct platform_device *pdev, struct hisi_pmu *l3c_pmu) { unsigned long long id; struct resource *res; acpi_status status; status = acpi_evaluate_integer(ACPI_HANDLE(&pdev->dev), "_UID", NULL, &id); if (ACPI_FAILURE(status)) return -EINVAL; l3c_pmu->index_id = id; /* * Use the SCCL_ID and CCL_ID to identify the L3C PMU, while * SCCL_ID is in MPIDR[aff2] and CCL_ID is in MPIDR[aff1]. */ if (device_property_read_u32(&pdev->dev, "hisilicon,scl-id", &l3c_pmu->sccl_id)) { dev_err(&pdev->dev, "Can not read l3c sccl-id!\n"); return -EINVAL; } if (device_property_read_u32(&pdev->dev, "hisilicon,ccl-id", &l3c_pmu->ccl_id)) { dev_err(&pdev->dev, "Can not read l3c ccl-id!\n"); return -EINVAL; } res = platform_get_resource(pdev, IORESOURCE_MEM, 0); l3c_pmu->base = devm_ioremap_resource(&pdev->dev, res); if (IS_ERR(l3c_pmu->base)) { dev_err(&pdev->dev, "ioremap failed for l3c_pmu resource\n"); return PTR_ERR(l3c_pmu->base); } return 0; } static struct attribute *hisi_l3c_pmu_format_attr[] = { HISI_PMU_FORMAT_ATTR(event, "config:0-7"), NULL, }; static const struct attribute_group hisi_l3c_pmu_format_group = { .name = "format", .attrs = hisi_l3c_pmu_format_attr, }; static struct attribute *hisi_l3c_pmu_events_attr[] = { HISI_PMU_EVENT_ATTR(rd_cpipe, 0x00), HISI_PMU_EVENT_ATTR(wr_cpipe, 0x01), HISI_PMU_EVENT_ATTR(rd_hit_cpipe, 0x02), HISI_PMU_EVENT_ATTR(wr_hit_cpipe, 0x03), HISI_PMU_EVENT_ATTR(victim_num, 0x04), HISI_PMU_EVENT_ATTR(rd_spipe, 0x20), HISI_PMU_EVENT_ATTR(wr_spipe, 0x21), HISI_PMU_EVENT_ATTR(rd_hit_spipe, 0x22), HISI_PMU_EVENT_ATTR(wr_hit_spipe, 0x23), HISI_PMU_EVENT_ATTR(back_invalid, 0x29), HISI_PMU_EVENT_ATTR(retry_cpu, 0x40), HISI_PMU_EVENT_ATTR(retry_ring, 0x41), HISI_PMU_EVENT_ATTR(prefetch_drop, 0x42), NULL, }; static const struct attribute_group hisi_l3c_pmu_events_group = { .name = "events", .attrs = hisi_l3c_pmu_events_attr, }; static DEVICE_ATTR(cpumask, 0444, hisi_cpumask_sysfs_show, NULL); static struct attribute *hisi_l3c_pmu_cpumask_attrs[] = { &dev_attr_cpumask.attr, NULL, }; static const struct attribute_group hisi_l3c_pmu_cpumask_attr_group = { .attrs = hisi_l3c_pmu_cpumask_attrs, }; static const struct attribute_group *hisi_l3c_pmu_attr_groups[] = { &hisi_l3c_pmu_format_group, &hisi_l3c_pmu_events_group, &hisi_l3c_pmu_cpumask_attr_group, NULL, }; static const struct hisi_uncore_ops hisi_uncore_l3c_ops = { .write_evtype = hisi_l3c_pmu_write_evtype, .get_event_idx = hisi_uncore_pmu_get_event_idx, .start_counters = hisi_l3c_pmu_start_counters, .stop_counters = hisi_l3c_pmu_stop_counters, .enable_counter = hisi_l3c_pmu_enable_counter, .disable_counter = hisi_l3c_pmu_disable_counter, .enable_counter_int = hisi_l3c_pmu_enable_counter_int, .disable_counter_int = hisi_l3c_pmu_disable_counter_int, .write_counter = hisi_l3c_pmu_write_counter, .read_counter = hisi_l3c_pmu_read_counter, }; static int hisi_l3c_pmu_dev_probe(struct platform_device *pdev, struct hisi_pmu *l3c_pmu) { int ret; ret = hisi_l3c_pmu_init_data(pdev, l3c_pmu); if (ret) return ret; ret = hisi_l3c_pmu_init_irq(l3c_pmu, pdev); if (ret) return ret; l3c_pmu->num_counters = L3C_NR_COUNTERS; l3c_pmu->counter_bits = 48; l3c_pmu->ops = &hisi_uncore_l3c_ops; l3c_pmu->dev = &pdev->dev; l3c_pmu->on_cpu = -1; l3c_pmu->check_event = 0x59; return 0; } static int hisi_l3c_pmu_probe(struct platform_device *pdev) { struct hisi_pmu *l3c_pmu; char *name; int ret; l3c_pmu = devm_kzalloc(&pdev->dev, sizeof(*l3c_pmu), GFP_KERNEL); if (!l3c_pmu) return -ENOMEM; platform_set_drvdata(pdev, l3c_pmu); ret = hisi_l3c_pmu_dev_probe(pdev, l3c_pmu); if (ret) return ret; ret = cpuhp_state_add_instance(CPUHP_AP_PERF_ARM_HISI_L3_ONLINE, &l3c_pmu->node); if (ret) { dev_err(&pdev->dev, "Error %d registering hotplug\n", ret); return ret; } name = devm_kasprintf(&pdev->dev, GFP_KERNEL, "hisi_sccl%u_l3c%u", l3c_pmu->sccl_id, l3c_pmu->index_id); l3c_pmu->pmu = (struct pmu) { .name = name, .task_ctx_nr = perf_invalid_context, .event_init = hisi_uncore_pmu_event_init, .pmu_enable = hisi_uncore_pmu_enable, .pmu_disable = hisi_uncore_pmu_disable, .add = hisi_uncore_pmu_add, .del = hisi_uncore_pmu_del, .start = hisi_uncore_pmu_start, .stop = hisi_uncore_pmu_stop, .read = hisi_uncore_pmu_read, .attr_groups = hisi_l3c_pmu_attr_groups, }; ret = perf_pmu_register(&l3c_pmu->pmu, name, -1); if (ret) { dev_err(l3c_pmu->dev, "L3C PMU register failed!\n"); cpuhp_state_remove_instance(CPUHP_AP_PERF_ARM_HISI_L3_ONLINE, &l3c_pmu->node); } return ret; } static int hisi_l3c_pmu_remove(struct platform_device *pdev) { struct hisi_pmu *l3c_pmu = platform_get_drvdata(pdev); perf_pmu_unregister(&l3c_pmu->pmu); cpuhp_state_remove_instance(CPUHP_AP_PERF_ARM_HISI_L3_ONLINE, &l3c_pmu->node); return 0; } static struct platform_driver hisi_l3c_pmu_driver = { .driver = { .name = "hisi_l3c_pmu", .acpi_match_table = ACPI_PTR(hisi_l3c_pmu_acpi_match), }, .probe = hisi_l3c_pmu_probe, .remove = hisi_l3c_pmu_remove, }; static int __init hisi_l3c_pmu_module_init(void) { int ret; ret = cpuhp_setup_state_multi(CPUHP_AP_PERF_ARM_HISI_L3_ONLINE, "AP_PERF_ARM_HISI_L3_ONLINE", hisi_uncore_pmu_online_cpu, hisi_uncore_pmu_offline_cpu); if (ret) { pr_err("L3C PMU: Error setup hotplug, ret = %d\n", ret); return ret; } ret = platform_driver_register(&hisi_l3c_pmu_driver); if (ret) cpuhp_remove_multi_state(CPUHP_AP_PERF_ARM_HISI_L3_ONLINE); return ret; } module_init(hisi_l3c_pmu_module_init); static void __exit hisi_l3c_pmu_module_exit(void) { platform_driver_unregister(&hisi_l3c_pmu_driver); cpuhp_remove_multi_state(CPUHP_AP_PERF_ARM_HISI_L3_ONLINE); } module_exit(hisi_l3c_pmu_module_exit); MODULE_DESCRIPTION("HiSilicon SoC L3C uncore PMU driver"); MODULE_LICENSE("GPL v2"); MODULE_AUTHOR("Anurup M <anurup.m@huawei.com>"); MODULE_AUTHOR("Shaokun Zhang <zhangshaokun@hisilicon.com>");