/* * Copyright (C) 2013 Advanced Micro Devices, Inc. * * Author: Steven Kinney * Author: Suravee Suthikulpanit * * Perf: amd_iommu - AMD IOMMU Performance Counter PMU implementation * * 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 #include #include #include #include "perf_event.h" #include "perf_event_amd_iommu.h" #define COUNTER_SHIFT 16 #define _GET_BANK(ev) ((u8)(ev->hw.extra_reg.reg >> 8)) #define _GET_CNTR(ev) ((u8)(ev->hw.extra_reg.reg)) /* iommu pmu config masks */ #define _GET_CSOURCE(ev) ((ev->hw.config & 0xFFULL)) #define _GET_DEVID(ev) ((ev->hw.config >> 8) & 0xFFFFULL) #define _GET_PASID(ev) ((ev->hw.config >> 24) & 0xFFFFULL) #define _GET_DOMID(ev) ((ev->hw.config >> 40) & 0xFFFFULL) #define _GET_DEVID_MASK(ev) ((ev->hw.extra_reg.config) & 0xFFFFULL) #define _GET_PASID_MASK(ev) ((ev->hw.extra_reg.config >> 16) & 0xFFFFULL) #define _GET_DOMID_MASK(ev) ((ev->hw.extra_reg.config >> 32) & 0xFFFFULL) static struct perf_amd_iommu __perf_iommu; struct perf_amd_iommu { struct pmu pmu; u8 max_banks; u8 max_counters; u64 cntr_assign_mask; raw_spinlock_t lock; const struct attribute_group *attr_groups[4]; }; #define format_group attr_groups[0] #define cpumask_group attr_groups[1] #define events_group attr_groups[2] #define null_group attr_groups[3] /*--------------------------------------------- * sysfs format attributes *---------------------------------------------*/ PMU_FORMAT_ATTR(csource, "config:0-7"); PMU_FORMAT_ATTR(devid, "config:8-23"); PMU_FORMAT_ATTR(pasid, "config:24-39"); PMU_FORMAT_ATTR(domid, "config:40-55"); PMU_FORMAT_ATTR(devid_mask, "config1:0-15"); PMU_FORMAT_ATTR(pasid_mask, "config1:16-31"); PMU_FORMAT_ATTR(domid_mask, "config1:32-47"); static struct attribute *iommu_format_attrs[] = { &format_attr_csource.attr, &format_attr_devid.attr, &format_attr_pasid.attr, &format_attr_domid.attr, &format_attr_devid_mask.attr, &format_attr_pasid_mask.attr, &format_attr_domid_mask.attr, NULL, }; static struct attribute_group amd_iommu_format_group = { .name = "format", .attrs = iommu_format_attrs, }; /*--------------------------------------------- * sysfs events attributes *---------------------------------------------*/ struct amd_iommu_event_desc { struct kobj_attribute attr; const char *event; }; static ssize_t _iommu_event_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { struct amd_iommu_event_desc *event = container_of(attr, struct amd_iommu_event_desc, attr); return sprintf(buf, "%s\n", event->event); } #define AMD_IOMMU_EVENT_DESC(_name, _event) \ { \ .attr = __ATTR(_name, 0444, _iommu_event_show, NULL), \ .event = _event, \ } static struct amd_iommu_event_desc amd_iommu_v2_event_descs[] = { AMD_IOMMU_EVENT_DESC(mem_pass_untrans, "csource=0x01"), AMD_IOMMU_EVENT_DESC(mem_pass_pretrans, "csource=0x02"), AMD_IOMMU_EVENT_DESC(mem_pass_excl, "csource=0x03"), AMD_IOMMU_EVENT_DESC(mem_target_abort, "csource=0x04"), AMD_IOMMU_EVENT_DESC(mem_trans_total, "csource=0x05"), AMD_IOMMU_EVENT_DESC(mem_iommu_tlb_pte_hit, "csource=0x06"), AMD_IOMMU_EVENT_DESC(mem_iommu_tlb_pte_mis, "csource=0x07"), AMD_IOMMU_EVENT_DESC(mem_iommu_tlb_pde_hit, "csource=0x08"), AMD_IOMMU_EVENT_DESC(mem_iommu_tlb_pde_mis, "csource=0x09"), AMD_IOMMU_EVENT_DESC(mem_dte_hit, "csource=0x0a"), AMD_IOMMU_EVENT_DESC(mem_dte_mis, "csource=0x0b"), AMD_IOMMU_EVENT_DESC(page_tbl_read_tot, "csource=0x0c"), AMD_IOMMU_EVENT_DESC(page_tbl_read_nst, "csource=0x0d"), AMD_IOMMU_EVENT_DESC(page_tbl_read_gst, "csource=0x0e"), AMD_IOMMU_EVENT_DESC(int_dte_hit, "csource=0x0f"), AMD_IOMMU_EVENT_DESC(int_dte_mis, "csource=0x10"), AMD_IOMMU_EVENT_DESC(cmd_processed, "csource=0x11"), AMD_IOMMU_EVENT_DESC(cmd_processed_inv, "csource=0x12"), AMD_IOMMU_EVENT_DESC(tlb_inv, "csource=0x13"), { /* end: all zeroes */ }, }; /*--------------------------------------------- * sysfs cpumask attributes *---------------------------------------------*/ static cpumask_t iommu_cpumask; static ssize_t _iommu_cpumask_show(struct device *dev, struct device_attribute *attr, char *buf) { int n = cpulist_scnprintf(buf, PAGE_SIZE - 2, &iommu_cpumask); buf[n++] = '\n'; buf[n] = '\0'; return n; } static DEVICE_ATTR(cpumask, S_IRUGO, _iommu_cpumask_show, NULL); static struct attribute *iommu_cpumask_attrs[] = { &dev_attr_cpumask.attr, NULL, }; static struct attribute_group amd_iommu_cpumask_group = { .attrs = iommu_cpumask_attrs, }; /*---------------------------------------------*/ static int get_next_avail_iommu_bnk_cntr(struct perf_amd_iommu *perf_iommu) { unsigned long flags; int shift, bank, cntr, retval; int max_banks = perf_iommu->max_banks; int max_cntrs = perf_iommu->max_counters; raw_spin_lock_irqsave(&perf_iommu->lock, flags); for (bank = 0, shift = 0; bank < max_banks; bank++) { for (cntr = 0; cntr < max_cntrs; cntr++) { shift = bank + (bank*3) + cntr; if (perf_iommu->cntr_assign_mask & (1ULL<cntr_assign_mask |= (1ULL<lock, flags); return retval; } static int clear_avail_iommu_bnk_cntr(struct perf_amd_iommu *perf_iommu, u8 bank, u8 cntr) { unsigned long flags; int max_banks, max_cntrs; int shift = 0; max_banks = perf_iommu->max_banks; max_cntrs = perf_iommu->max_counters; if ((bank > max_banks) || (cntr > max_cntrs)) return -EINVAL; shift = bank + cntr + (bank*3); raw_spin_lock_irqsave(&perf_iommu->lock, flags); perf_iommu->cntr_assign_mask &= ~(1ULL<lock, flags); return 0; } static int perf_iommu_event_init(struct perf_event *event) { struct hw_perf_event *hwc = &event->hw; struct perf_amd_iommu *perf_iommu; u64 config, config1; /* test the event attr type check for PMU enumeration */ if (event->attr.type != event->pmu->type) return -ENOENT; /* * IOMMU counters are shared across all cores. * Therefore, it does not support per-process mode. * Also, it does not support event sampling mode. */ if (is_sampling_event(event) || event->attach_state & PERF_ATTACH_TASK) return -EINVAL; /* IOMMU counters do not have usr/os/guest/host bits */ if (event->attr.exclude_user || event->attr.exclude_kernel || event->attr.exclude_host || event->attr.exclude_guest) return -EINVAL; if (event->cpu < 0) return -EINVAL; perf_iommu = &__perf_iommu; if (event->pmu != &perf_iommu->pmu) return -ENOENT; if (perf_iommu) { config = event->attr.config; config1 = event->attr.config1; } else { return -EINVAL; } /* integrate with iommu base devid (0000), assume one iommu */ perf_iommu->max_banks = amd_iommu_pc_get_max_banks(IOMMU_BASE_DEVID); perf_iommu->max_counters = amd_iommu_pc_get_max_counters(IOMMU_BASE_DEVID); if ((perf_iommu->max_banks == 0) || (perf_iommu->max_counters == 0)) return -EINVAL; /* update the hw_perf_event struct with the iommu config data */ hwc->config = config; hwc->extra_reg.config = config1; return 0; } static void perf_iommu_enable_event(struct perf_event *ev) { u8 csource = _GET_CSOURCE(ev); u16 devid = _GET_DEVID(ev); u64 reg = 0ULL; reg = csource; amd_iommu_pc_get_set_reg_val(devid, _GET_BANK(ev), _GET_CNTR(ev) , IOMMU_PC_COUNTER_SRC_REG, ®, true); reg = 0ULL | devid | (_GET_DEVID_MASK(ev) << 32); if (reg) reg |= (1UL << 31); amd_iommu_pc_get_set_reg_val(devid, _GET_BANK(ev), _GET_CNTR(ev) , IOMMU_PC_DEVID_MATCH_REG, ®, true); reg = 0ULL | _GET_PASID(ev) | (_GET_PASID_MASK(ev) << 32); if (reg) reg |= (1UL << 31); amd_iommu_pc_get_set_reg_val(devid, _GET_BANK(ev), _GET_CNTR(ev) , IOMMU_PC_PASID_MATCH_REG, ®, true); reg = 0ULL | _GET_DOMID(ev) | (_GET_DOMID_MASK(ev) << 32); if (reg) reg |= (1UL << 31); amd_iommu_pc_get_set_reg_val(devid, _GET_BANK(ev), _GET_CNTR(ev) , IOMMU_PC_DOMID_MATCH_REG, ®, true); } static void perf_iommu_disable_event(struct perf_event *event) { u64 reg = 0ULL; amd_iommu_pc_get_set_reg_val(_GET_DEVID(event), _GET_BANK(event), _GET_CNTR(event), IOMMU_PC_COUNTER_SRC_REG, ®, true); } static void perf_iommu_start(struct perf_event *event, int flags) { struct hw_perf_event *hwc = &event->hw; pr_debug("perf: amd_iommu:perf_iommu_start\n"); if (WARN_ON_ONCE(!(hwc->state & PERF_HES_STOPPED))) return; WARN_ON_ONCE(!(hwc->state & PERF_HES_UPTODATE)); hwc->state = 0; if (flags & PERF_EF_RELOAD) { u64 prev_raw_count = local64_read(&hwc->prev_count); amd_iommu_pc_get_set_reg_val(_GET_DEVID(event), _GET_BANK(event), _GET_CNTR(event), IOMMU_PC_COUNTER_REG, &prev_raw_count, true); } perf_iommu_enable_event(event); perf_event_update_userpage(event); } static void perf_iommu_read(struct perf_event *event) { u64 count = 0ULL; u64 prev_raw_count = 0ULL; u64 delta = 0ULL; struct hw_perf_event *hwc = &event->hw; pr_debug("perf: amd_iommu:perf_iommu_read\n"); amd_iommu_pc_get_set_reg_val(_GET_DEVID(event), _GET_BANK(event), _GET_CNTR(event), IOMMU_PC_COUNTER_REG, &count, false); /* IOMMU pc counter register is only 48 bits */ count &= 0xFFFFFFFFFFFFULL; prev_raw_count = local64_read(&hwc->prev_count); if (local64_cmpxchg(&hwc->prev_count, prev_raw_count, count) != prev_raw_count) return; /* Handling 48-bit counter overflowing */ delta = (count << COUNTER_SHIFT) - (prev_raw_count << COUNTER_SHIFT); delta >>= COUNTER_SHIFT; local64_add(delta, &event->count); } static void perf_iommu_stop(struct perf_event *event, int flags) { struct hw_perf_event *hwc = &event->hw; u64 config; pr_debug("perf: amd_iommu:perf_iommu_stop\n"); if (hwc->state & PERF_HES_UPTODATE) return; perf_iommu_disable_event(event); WARN_ON_ONCE(hwc->state & PERF_HES_STOPPED); hwc->state |= PERF_HES_STOPPED; if (hwc->state & PERF_HES_UPTODATE) return; config = hwc->config; perf_iommu_read(event); hwc->state |= PERF_HES_UPTODATE; } static int perf_iommu_add(struct perf_event *event, int flags) { int retval; struct perf_amd_iommu *perf_iommu = container_of(event->pmu, struct perf_amd_iommu, pmu); pr_debug("perf: amd_iommu:perf_iommu_add\n"); event->hw.state = PERF_HES_UPTODATE | PERF_HES_STOPPED; /* request an iommu bank/counter */ retval = get_next_avail_iommu_bnk_cntr(perf_iommu); if (retval != -ENOSPC) event->hw.extra_reg.reg = (u16)retval; else return retval; if (flags & PERF_EF_START) perf_iommu_start(event, PERF_EF_RELOAD); return 0; } static void perf_iommu_del(struct perf_event *event, int flags) { struct perf_amd_iommu *perf_iommu = container_of(event->pmu, struct perf_amd_iommu, pmu); pr_debug("perf: amd_iommu:perf_iommu_del\n"); perf_iommu_stop(event, PERF_EF_UPDATE); /* clear the assigned iommu bank/counter */ clear_avail_iommu_bnk_cntr(perf_iommu, _GET_BANK(event), _GET_CNTR(event)); perf_event_update_userpage(event); } static __init int _init_events_attrs(struct perf_amd_iommu *perf_iommu) { struct attribute **attrs; struct attribute_group *attr_group; int i = 0, j; while (amd_iommu_v2_event_descs[i].attr.attr.name) i++; attr_group = kzalloc(sizeof(struct attribute *) * (i + 1) + sizeof(*attr_group), GFP_KERNEL); if (!attr_group) return -ENOMEM; attrs = (struct attribute **)(attr_group + 1); for (j = 0; j < i; j++) attrs[j] = &amd_iommu_v2_event_descs[j].attr.attr; attr_group->name = "events"; attr_group->attrs = attrs; perf_iommu->events_group = attr_group; return 0; } static __init void amd_iommu_pc_exit(void) { if (__perf_iommu.events_group != NULL) { kfree(__perf_iommu.events_group); __perf_iommu.events_group = NULL; } } static __init int _init_perf_amd_iommu( struct perf_amd_iommu *perf_iommu, char *name) { int ret; raw_spin_lock_init(&perf_iommu->lock); /* Init format attributes */ perf_iommu->format_group = &amd_iommu_format_group; /* Init cpumask attributes to only core 0 */ cpumask_set_cpu(0, &iommu_cpumask); perf_iommu->cpumask_group = &amd_iommu_cpumask_group; /* Init events attributes */ if (_init_events_attrs(perf_iommu) != 0) pr_err("perf: amd_iommu: Only support raw events.\n"); /* Init null attributes */ perf_iommu->null_group = NULL; perf_iommu->pmu.attr_groups = perf_iommu->attr_groups; ret = perf_pmu_register(&perf_iommu->pmu, name, -1); if (ret) { pr_err("perf: amd_iommu: Failed to initialized.\n"); amd_iommu_pc_exit(); } else { pr_info("perf: amd_iommu: Detected. (%d banks, %d counters/bank)\n", amd_iommu_pc_get_max_banks(IOMMU_BASE_DEVID), amd_iommu_pc_get_max_counters(IOMMU_BASE_DEVID)); } return ret; } static struct perf_amd_iommu __perf_iommu = { .pmu = { .event_init = perf_iommu_event_init, .add = perf_iommu_add, .del = perf_iommu_del, .start = perf_iommu_start, .stop = perf_iommu_stop, .read = perf_iommu_read, }, .max_banks = 0x00, .max_counters = 0x00, .cntr_assign_mask = 0ULL, .format_group = NULL, .cpumask_group = NULL, .events_group = NULL, .null_group = NULL, }; static __init int amd_iommu_pc_init(void) { /* Make sure the IOMMU PC resource is available */ if (!amd_iommu_pc_supported()) return -ENODEV; _init_perf_amd_iommu(&__perf_iommu, "amd_iommu"); return 0; } device_initcall(amd_iommu_pc_init);