#include #include #include #include #include #include #include "perf_event.h" static __initconst const u64 amd_hw_cache_event_ids [PERF_COUNT_HW_CACHE_MAX] [PERF_COUNT_HW_CACHE_OP_MAX] [PERF_COUNT_HW_CACHE_RESULT_MAX] = { [ C(L1D) ] = { [ C(OP_READ) ] = { [ C(RESULT_ACCESS) ] = 0x0040, /* Data Cache Accesses */ [ C(RESULT_MISS) ] = 0x0141, /* Data Cache Misses */ }, [ C(OP_WRITE) ] = { [ C(RESULT_ACCESS) ] = 0x0142, /* Data Cache Refills :system */ [ C(RESULT_MISS) ] = 0, }, [ C(OP_PREFETCH) ] = { [ C(RESULT_ACCESS) ] = 0x0267, /* Data Prefetcher :attempts */ [ C(RESULT_MISS) ] = 0x0167, /* Data Prefetcher :cancelled */ }, }, [ C(L1I ) ] = { [ C(OP_READ) ] = { [ C(RESULT_ACCESS) ] = 0x0080, /* Instruction cache fetches */ [ C(RESULT_MISS) ] = 0x0081, /* Instruction cache misses */ }, [ C(OP_WRITE) ] = { [ C(RESULT_ACCESS) ] = -1, [ C(RESULT_MISS) ] = -1, }, [ C(OP_PREFETCH) ] = { [ C(RESULT_ACCESS) ] = 0x014B, /* Prefetch Instructions :Load */ [ C(RESULT_MISS) ] = 0, }, }, [ C(LL ) ] = { [ C(OP_READ) ] = { [ C(RESULT_ACCESS) ] = 0x037D, /* Requests to L2 Cache :IC+DC */ [ C(RESULT_MISS) ] = 0x037E, /* L2 Cache Misses : IC+DC */ }, [ C(OP_WRITE) ] = { [ C(RESULT_ACCESS) ] = 0x017F, /* L2 Fill/Writeback */ [ C(RESULT_MISS) ] = 0, }, [ C(OP_PREFETCH) ] = { [ C(RESULT_ACCESS) ] = 0, [ C(RESULT_MISS) ] = 0, }, }, [ C(DTLB) ] = { [ C(OP_READ) ] = { [ C(RESULT_ACCESS) ] = 0x0040, /* Data Cache Accesses */ [ C(RESULT_MISS) ] = 0x0746, /* L1_DTLB_AND_L2_DLTB_MISS.ALL */ }, [ C(OP_WRITE) ] = { [ C(RESULT_ACCESS) ] = 0, [ C(RESULT_MISS) ] = 0, }, [ C(OP_PREFETCH) ] = { [ C(RESULT_ACCESS) ] = 0, [ C(RESULT_MISS) ] = 0, }, }, [ C(ITLB) ] = { [ C(OP_READ) ] = { [ C(RESULT_ACCESS) ] = 0x0080, /* Instruction fecthes */ [ C(RESULT_MISS) ] = 0x0385, /* L1_ITLB_AND_L2_ITLB_MISS.ALL */ }, [ C(OP_WRITE) ] = { [ C(RESULT_ACCESS) ] = -1, [ C(RESULT_MISS) ] = -1, }, [ C(OP_PREFETCH) ] = { [ C(RESULT_ACCESS) ] = -1, [ C(RESULT_MISS) ] = -1, }, }, [ C(BPU ) ] = { [ C(OP_READ) ] = { [ C(RESULT_ACCESS) ] = 0x00c2, /* Retired Branch Instr. */ [ C(RESULT_MISS) ] = 0x00c3, /* Retired Mispredicted BI */ }, [ C(OP_WRITE) ] = { [ C(RESULT_ACCESS) ] = -1, [ C(RESULT_MISS) ] = -1, }, [ C(OP_PREFETCH) ] = { [ C(RESULT_ACCESS) ] = -1, [ C(RESULT_MISS) ] = -1, }, }, [ C(NODE) ] = { [ C(OP_READ) ] = { [ C(RESULT_ACCESS) ] = 0xb8e9, /* CPU Request to Memory, l+r */ [ C(RESULT_MISS) ] = 0x98e9, /* CPU Request to Memory, r */ }, [ C(OP_WRITE) ] = { [ C(RESULT_ACCESS) ] = -1, [ C(RESULT_MISS) ] = -1, }, [ C(OP_PREFETCH) ] = { [ C(RESULT_ACCESS) ] = -1, [ C(RESULT_MISS) ] = -1, }, }, }; /* * AMD Performance Monitor K7 and later. */ static const u64 amd_perfmon_event_map[] = { [PERF_COUNT_HW_CPU_CYCLES] = 0x0076, [PERF_COUNT_HW_INSTRUCTIONS] = 0x00c0, [PERF_COUNT_HW_CACHE_REFERENCES] = 0x0080, [PERF_COUNT_HW_CACHE_MISSES] = 0x0081, [PERF_COUNT_HW_BRANCH_INSTRUCTIONS] = 0x00c2, [PERF_COUNT_HW_BRANCH_MISSES] = 0x00c3, [PERF_COUNT_HW_STALLED_CYCLES_FRONTEND] = 0x00d0, /* "Decoder empty" event */ [PERF_COUNT_HW_STALLED_CYCLES_BACKEND] = 0x00d1, /* "Dispatch stalls" event */ }; static u64 amd_pmu_event_map(int hw_event) { return amd_perfmon_event_map[hw_event]; } static int amd_pmu_hw_config(struct perf_event *event) { int ret; /* pass precise event sampling to ibs: */ if (event->attr.precise_ip && get_ibs_caps()) return -ENOENT; ret = x86_pmu_hw_config(event); if (ret) return ret; if (has_branch_stack(event)) return -EOPNOTSUPP; if (event->attr.exclude_host && event->attr.exclude_guest) /* * When HO == GO == 1 the hardware treats that as GO == HO == 0 * and will count in both modes. We don't want to count in that * case so we emulate no-counting by setting US = OS = 0. */ event->hw.config &= ~(ARCH_PERFMON_EVENTSEL_USR | ARCH_PERFMON_EVENTSEL_OS); else if (event->attr.exclude_host) event->hw.config |= AMD_PERFMON_EVENTSEL_GUESTONLY; else if (event->attr.exclude_guest) event->hw.config |= AMD_PERFMON_EVENTSEL_HOSTONLY; if (event->attr.type != PERF_TYPE_RAW) return 0; event->hw.config |= event->attr.config & AMD64_RAW_EVENT_MASK; return 0; } /* * AMD64 events are detected based on their event codes. */ static inline unsigned int amd_get_event_code(struct hw_perf_event *hwc) { return ((hwc->config >> 24) & 0x0f00) | (hwc->config & 0x00ff); } static inline int amd_is_nb_event(struct hw_perf_event *hwc) { return (hwc->config & 0xe0) == 0xe0; } static inline int amd_has_nb(struct cpu_hw_events *cpuc) { struct amd_nb *nb = cpuc->amd_nb; return nb && nb->nb_id != -1; } static void amd_put_event_constraints(struct cpu_hw_events *cpuc, struct perf_event *event) { struct hw_perf_event *hwc = &event->hw; struct amd_nb *nb = cpuc->amd_nb; int i; /* * only care about NB events */ if (!(amd_has_nb(cpuc) && amd_is_nb_event(hwc))) return; /* * need to scan whole list because event may not have * been assigned during scheduling * * no race condition possible because event can only * be removed on one CPU at a time AND PMU is disabled * when we come here */ for (i = 0; i < x86_pmu.num_counters; i++) { if (cmpxchg(nb->owners + i, event, NULL) == event) break; } } /* * AMD64 NorthBridge events need special treatment because * counter access needs to be synchronized across all cores * of a package. Refer to BKDG section 3.12 * * NB events are events measuring L3 cache, Hypertransport * traffic. They are identified by an event code >= 0xe00. * They measure events on the NorthBride which is shared * by all cores on a package. NB events are counted on a * shared set of counters. When a NB event is programmed * in a counter, the data actually comes from a shared * counter. Thus, access to those counters needs to be * synchronized. * * We implement the synchronization such that no two cores * can be measuring NB events using the same counters. Thus, * we maintain a per-NB allocation table. The available slot * is propagated using the event_constraint structure. * * We provide only one choice for each NB event based on * the fact that only NB events have restrictions. Consequently, * if a counter is available, there is a guarantee the NB event * will be assigned to it. If no slot is available, an empty * constraint is returned and scheduling will eventually fail * for this event. * * Note that all cores attached the same NB compete for the same * counters to host NB events, this is why we use atomic ops. Some * multi-chip CPUs may have more than one NB. * * Given that resources are allocated (cmpxchg), they must be * eventually freed for others to use. This is accomplished by * calling amd_put_event_constraints(). * * Non NB events are not impacted by this restriction. */ static struct event_constraint * amd_get_event_constraints(struct cpu_hw_events *cpuc, struct perf_event *event) { struct hw_perf_event *hwc = &event->hw; struct amd_nb *nb = cpuc->amd_nb; struct perf_event *old = NULL; int max = x86_pmu.num_counters; int i, j, k = -1; /* * if not NB event or no NB, then no constraints */ if (!(amd_has_nb(cpuc) && amd_is_nb_event(hwc))) return &unconstrained; /* * detect if already present, if so reuse * * cannot merge with actual allocation * because of possible holes * * event can already be present yet not assigned (in hwc->idx) * because of successive calls to x86_schedule_events() from * hw_perf_group_sched_in() without hw_perf_enable() */ for (i = 0; i < max; i++) { /* * keep track of first free slot */ if (k == -1 && !nb->owners[i]) k = i; /* already present, reuse */ if (nb->owners[i] == event) goto done; } /* * not present, so grab a new slot * starting either at: */ if (hwc->idx != -1) { /* previous assignment */ i = hwc->idx; } else if (k != -1) { /* start from free slot found */ i = k; } else { /* * event not found, no slot found in * first pass, try again from the * beginning */ i = 0; } j = i; do { old = cmpxchg(nb->owners+i, NULL, event); if (!old) break; if (++i == max) i = 0; } while (i != j); done: if (!old) return &nb->event_constraints[i]; return &emptyconstraint; } static struct amd_nb *amd_alloc_nb(int cpu) { struct amd_nb *nb; int i; nb = kmalloc_node(sizeof(struct amd_nb), GFP_KERNEL | __GFP_ZERO, cpu_to_node(cpu)); if (!nb) return NULL; nb->nb_id = -1; /* * initialize all possible NB constraints */ for (i = 0; i < x86_pmu.num_counters; i++) { __set_bit(i, nb->event_constraints[i].idxmsk); nb->event_constraints[i].weight = 1; } return nb; } static int amd_pmu_cpu_prepare(int cpu) { struct cpu_hw_events *cpuc = &per_cpu(cpu_hw_events, cpu); WARN_ON_ONCE(cpuc->amd_nb); if (boot_cpu_data.x86_max_cores < 2) return NOTIFY_OK; cpuc->amd_nb = amd_alloc_nb(cpu); if (!cpuc->amd_nb) return NOTIFY_BAD; return NOTIFY_OK; } static void amd_pmu_cpu_starting(int cpu) { struct cpu_hw_events *cpuc = &per_cpu(cpu_hw_events, cpu); struct amd_nb *nb; int i, nb_id; cpuc->perf_ctr_virt_mask = AMD_PERFMON_EVENTSEL_HOSTONLY; if (boot_cpu_data.x86_max_cores < 2) return; nb_id = amd_get_nb_id(cpu); WARN_ON_ONCE(nb_id == BAD_APICID); for_each_online_cpu(i) { nb = per_cpu(cpu_hw_events, i).amd_nb; if (WARN_ON_ONCE(!nb)) continue; if (nb->nb_id == nb_id) { cpuc->kfree_on_online = cpuc->amd_nb; cpuc->amd_nb = nb; break; } } cpuc->amd_nb->nb_id = nb_id; cpuc->amd_nb->refcnt++; } static void amd_pmu_cpu_dead(int cpu) { struct cpu_hw_events *cpuhw; if (boot_cpu_data.x86_max_cores < 2) return; cpuhw = &per_cpu(cpu_hw_events, cpu); if (cpuhw->amd_nb) { struct amd_nb *nb = cpuhw->amd_nb; if (nb->nb_id == -1 || --nb->refcnt == 0) kfree(nb); cpuhw->amd_nb = NULL; } } PMU_FORMAT_ATTR(event, "config:0-7,32-35"); PMU_FORMAT_ATTR(umask, "config:8-15" ); PMU_FORMAT_ATTR(edge, "config:18" ); PMU_FORMAT_ATTR(inv, "config:23" ); PMU_FORMAT_ATTR(cmask, "config:24-31" ); static struct attribute *amd_format_attr[] = { &format_attr_event.attr, &format_attr_umask.attr, &format_attr_edge.attr, &format_attr_inv.attr, &format_attr_cmask.attr, NULL, }; /* AMD Family 15h */ #define AMD_EVENT_TYPE_MASK 0x000000F0ULL #define AMD_EVENT_FP 0x00000000ULL ... 0x00000010ULL #define AMD_EVENT_LS 0x00000020ULL ... 0x00000030ULL #define AMD_EVENT_DC 0x00000040ULL ... 0x00000050ULL #define AMD_EVENT_CU 0x00000060ULL ... 0x00000070ULL #define AMD_EVENT_IC_DE 0x00000080ULL ... 0x00000090ULL #define AMD_EVENT_EX_LS 0x000000C0ULL #define AMD_EVENT_DE 0x000000D0ULL #define AMD_EVENT_NB 0x000000E0ULL ... 0x000000F0ULL /* * AMD family 15h event code/PMC mappings: * * type = event_code & 0x0F0: * * 0x000 FP PERF_CTL[5:3] * 0x010 FP PERF_CTL[5:3] * 0x020 LS PERF_CTL[5:0] * 0x030 LS PERF_CTL[5:0] * 0x040 DC PERF_CTL[5:0] * 0x050 DC PERF_CTL[5:0] * 0x060 CU PERF_CTL[2:0] * 0x070 CU PERF_CTL[2:0] * 0x080 IC/DE PERF_CTL[2:0] * 0x090 IC/DE PERF_CTL[2:0] * 0x0A0 --- * 0x0B0 --- * 0x0C0 EX/LS PERF_CTL[5:0] * 0x0D0 DE PERF_CTL[2:0] * 0x0E0 NB NB_PERF_CTL[3:0] * 0x0F0 NB NB_PERF_CTL[3:0] * * Exceptions: * * 0x000 FP PERF_CTL[3], PERF_CTL[5:3] (*) * 0x003 FP PERF_CTL[3] * 0x004 FP PERF_CTL[3], PERF_CTL[5:3] (*) * 0x00B FP PERF_CTL[3] * 0x00D FP PERF_CTL[3] * 0x023 DE PERF_CTL[2:0] * 0x02D LS PERF_CTL[3] * 0x02E LS PERF_CTL[3,0] * 0x031 LS PERF_CTL[2:0] (**) * 0x043 CU PERF_CTL[2:0] * 0x045 CU PERF_CTL[2:0] * 0x046 CU PERF_CTL[2:0] * 0x054 CU PERF_CTL[2:0] * 0x055 CU PERF_CTL[2:0] * 0x08F IC PERF_CTL[0] * 0x187 DE PERF_CTL[0] * 0x188 DE PERF_CTL[0] * 0x0DB EX PERF_CTL[5:0] * 0x0DC LS PERF_CTL[5:0] * 0x0DD LS PERF_CTL[5:0] * 0x0DE LS PERF_CTL[5:0] * 0x0DF LS PERF_CTL[5:0] * 0x1C0 EX PERF_CTL[5:3] * 0x1D6 EX PERF_CTL[5:0] * 0x1D8 EX PERF_CTL[5:0] * * (*) depending on the umask all FPU counters may be used * (**) only one unitmask enabled at a time */ static struct event_constraint amd_f15_PMC0 = EVENT_CONSTRAINT(0, 0x01, 0); static struct event_constraint amd_f15_PMC20 = EVENT_CONSTRAINT(0, 0x07, 0); static struct event_constraint amd_f15_PMC3 = EVENT_CONSTRAINT(0, 0x08, 0); static struct event_constraint amd_f15_PMC30 = EVENT_CONSTRAINT_OVERLAP(0, 0x09, 0); static struct event_constraint amd_f15_PMC50 = EVENT_CONSTRAINT(0, 0x3F, 0); static struct event_constraint amd_f15_PMC53 = EVENT_CONSTRAINT(0, 0x38, 0); static struct event_constraint * amd_get_event_constraints_f15h(struct cpu_hw_events *cpuc, struct perf_event *event) { struct hw_perf_event *hwc = &event->hw; unsigned int event_code = amd_get_event_code(hwc); switch (event_code & AMD_EVENT_TYPE_MASK) { case AMD_EVENT_FP: switch (event_code) { case 0x000: if (!(hwc->config & 0x0000F000ULL)) break; if (!(hwc->config & 0x00000F00ULL)) break; return &amd_f15_PMC3; case 0x004: if (hweight_long(hwc->config & ARCH_PERFMON_EVENTSEL_UMASK) <= 1) break; return &amd_f15_PMC3; case 0x003: case 0x00B: case 0x00D: return &amd_f15_PMC3; } return &amd_f15_PMC53; case AMD_EVENT_LS: case AMD_EVENT_DC: case AMD_EVENT_EX_LS: switch (event_code) { case 0x023: case 0x043: case 0x045: case 0x046: case 0x054: case 0x055: return &amd_f15_PMC20; case 0x02D: return &amd_f15_PMC3; case 0x02E: return &amd_f15_PMC30; case 0x031: if (hweight_long(hwc->config & ARCH_PERFMON_EVENTSEL_UMASK) <= 1) return &amd_f15_PMC20; return &emptyconstraint; case 0x1C0: return &amd_f15_PMC53; default: return &amd_f15_PMC50; } case AMD_EVENT_CU: case AMD_EVENT_IC_DE: case AMD_EVENT_DE: switch (event_code) { case 0x08F: case 0x187: case 0x188: return &amd_f15_PMC0; case 0x0DB ... 0x0DF: case 0x1D6: case 0x1D8: return &amd_f15_PMC50; default: return &amd_f15_PMC20; } case AMD_EVENT_NB: /* not yet implemented */ return &emptyconstraint; default: return &emptyconstraint; } } static __initconst const struct x86_pmu amd_pmu = { .name = "AMD", .handle_irq = x86_pmu_handle_irq, .disable_all = x86_pmu_disable_all, .enable_all = x86_pmu_enable_all, .enable = x86_pmu_enable_event, .disable = x86_pmu_disable_event, .hw_config = amd_pmu_hw_config, .schedule_events = x86_schedule_events, .eventsel = MSR_K7_EVNTSEL0, .perfctr = MSR_K7_PERFCTR0, .event_map = amd_pmu_event_map, .max_events = ARRAY_SIZE(amd_perfmon_event_map), .num_counters = AMD64_NUM_COUNTERS, .cntval_bits = 48, .cntval_mask = (1ULL << 48) - 1, .apic = 1, /* use highest bit to detect overflow */ .max_period = (1ULL << 47) - 1, .get_event_constraints = amd_get_event_constraints, .put_event_constraints = amd_put_event_constraints, .format_attrs = amd_format_attr, .cpu_prepare = amd_pmu_cpu_prepare, .cpu_starting = amd_pmu_cpu_starting, .cpu_dead = amd_pmu_cpu_dead, }; static int setup_event_constraints(void) { if (boot_cpu_data.x86 >= 0x15) x86_pmu.get_event_constraints = amd_get_event_constraints_f15h; return 0; } static int setup_perfctr_core(void) { if (!cpu_has_perfctr_core) { WARN(x86_pmu.get_event_constraints == amd_get_event_constraints_f15h, KERN_ERR "Odd, counter constraints enabled but no core perfctrs detected!"); return -ENODEV; } WARN(x86_pmu.get_event_constraints == amd_get_event_constraints, KERN_ERR "hw perf events core counters need constraints handler!"); /* * If core performance counter extensions exists, we must use * MSR_F15H_PERF_CTL/MSR_F15H_PERF_CTR msrs. See also * x86_pmu_addr_offset(). */ x86_pmu.eventsel = MSR_F15H_PERF_CTL; x86_pmu.perfctr = MSR_F15H_PERF_CTR; x86_pmu.num_counters = AMD64_NUM_COUNTERS_CORE; printk(KERN_INFO "perf: AMD core performance counters detected\n"); return 0; } __init int amd_pmu_init(void) { /* Performance-monitoring supported from K7 and later: */ if (boot_cpu_data.x86 < 6) return -ENODEV; x86_pmu = amd_pmu; setup_event_constraints(); setup_perfctr_core(); /* Events are common for all AMDs */ memcpy(hw_cache_event_ids, amd_hw_cache_event_ids, sizeof(hw_cache_event_ids)); return 0; } void amd_pmu_enable_virt(void) { struct cpu_hw_events *cpuc = &__get_cpu_var(cpu_hw_events); cpuc->perf_ctr_virt_mask = 0; /* Reload all events */ x86_pmu_disable_all(); x86_pmu_enable_all(0); } EXPORT_SYMBOL_GPL(amd_pmu_enable_virt); void amd_pmu_disable_virt(void) { struct cpu_hw_events *cpuc = &__get_cpu_var(cpu_hw_events); /* * We only mask out the Host-only bit so that host-only counting works * when SVM is disabled. If someone sets up a guest-only counter when * SVM is disabled the Guest-only bits still gets set and the counter * will not count anything. */ cpuc->perf_ctr_virt_mask = AMD_PERFMON_EVENTSEL_HOSTONLY; /* Reload all events */ x86_pmu_disable_all(); x86_pmu_enable_all(0); } EXPORT_SYMBOL_GPL(amd_pmu_disable_virt);