1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/perf_event.h>
3 #include <asm/intel-family.h>
17 static bool test_aperfmperf(int idx)
19 return boot_cpu_has(X86_FEATURE_APERFMPERF);
22 static bool test_ptsc(int idx)
24 return boot_cpu_has(X86_FEATURE_PTSC);
27 static bool test_irperf(int idx)
29 return boot_cpu_has(X86_FEATURE_IRPERF);
32 static bool test_intel(int idx)
34 if (boot_cpu_data.x86_vendor != X86_VENDOR_INTEL ||
35 boot_cpu_data.x86 != 6)
38 switch (boot_cpu_data.x86_model) {
39 case INTEL_FAM6_NEHALEM:
40 case INTEL_FAM6_NEHALEM_G:
41 case INTEL_FAM6_NEHALEM_EP:
42 case INTEL_FAM6_NEHALEM_EX:
44 case INTEL_FAM6_WESTMERE:
45 case INTEL_FAM6_WESTMERE_EP:
46 case INTEL_FAM6_WESTMERE_EX:
48 case INTEL_FAM6_SANDYBRIDGE:
49 case INTEL_FAM6_SANDYBRIDGE_X:
51 case INTEL_FAM6_IVYBRIDGE:
52 case INTEL_FAM6_IVYBRIDGE_X:
54 case INTEL_FAM6_HASWELL_CORE:
55 case INTEL_FAM6_HASWELL_X:
56 case INTEL_FAM6_HASWELL_ULT:
57 case INTEL_FAM6_HASWELL_GT3E:
59 case INTEL_FAM6_BROADWELL_CORE:
60 case INTEL_FAM6_BROADWELL_XEON_D:
61 case INTEL_FAM6_BROADWELL_GT3E:
62 case INTEL_FAM6_BROADWELL_X:
64 case INTEL_FAM6_ATOM_SILVERMONT1:
65 case INTEL_FAM6_ATOM_SILVERMONT2:
66 case INTEL_FAM6_ATOM_AIRMONT:
68 case INTEL_FAM6_ATOM_GOLDMONT:
69 case INTEL_FAM6_ATOM_DENVERTON:
71 case INTEL_FAM6_ATOM_GEMINI_LAKE:
73 case INTEL_FAM6_XEON_PHI_KNL:
74 case INTEL_FAM6_XEON_PHI_KNM:
75 if (idx == PERF_MSR_SMI)
79 case INTEL_FAM6_SKYLAKE_MOBILE:
80 case INTEL_FAM6_SKYLAKE_DESKTOP:
81 case INTEL_FAM6_SKYLAKE_X:
82 case INTEL_FAM6_KABYLAKE_MOBILE:
83 case INTEL_FAM6_KABYLAKE_DESKTOP:
84 if (idx == PERF_MSR_SMI || idx == PERF_MSR_PPERF)
94 struct perf_pmu_events_attr *attr;
95 bool (*test)(int idx);
98 PMU_EVENT_ATTR_STRING(tsc, evattr_tsc, "event=0x00");
99 PMU_EVENT_ATTR_STRING(aperf, evattr_aperf, "event=0x01");
100 PMU_EVENT_ATTR_STRING(mperf, evattr_mperf, "event=0x02");
101 PMU_EVENT_ATTR_STRING(pperf, evattr_pperf, "event=0x03");
102 PMU_EVENT_ATTR_STRING(smi, evattr_smi, "event=0x04");
103 PMU_EVENT_ATTR_STRING(ptsc, evattr_ptsc, "event=0x05");
104 PMU_EVENT_ATTR_STRING(irperf, evattr_irperf, "event=0x06");
106 static struct perf_msr msr[] = {
107 [PERF_MSR_TSC] = { 0, &evattr_tsc, NULL, },
108 [PERF_MSR_APERF] = { MSR_IA32_APERF, &evattr_aperf, test_aperfmperf, },
109 [PERF_MSR_MPERF] = { MSR_IA32_MPERF, &evattr_mperf, test_aperfmperf, },
110 [PERF_MSR_PPERF] = { MSR_PPERF, &evattr_pperf, test_intel, },
111 [PERF_MSR_SMI] = { MSR_SMI_COUNT, &evattr_smi, test_intel, },
112 [PERF_MSR_PTSC] = { MSR_F15H_PTSC, &evattr_ptsc, test_ptsc, },
113 [PERF_MSR_IRPERF] = { MSR_F17H_IRPERF, &evattr_irperf, test_irperf, },
116 static struct attribute *events_attrs[PERF_MSR_EVENT_MAX + 1] = {
120 static struct attribute_group events_attr_group = {
122 .attrs = events_attrs,
125 PMU_FORMAT_ATTR(event, "config:0-63");
126 static struct attribute *format_attrs[] = {
127 &format_attr_event.attr,
130 static struct attribute_group format_attr_group = {
132 .attrs = format_attrs,
135 static const struct attribute_group *attr_groups[] = {
141 static int msr_event_init(struct perf_event *event)
143 u64 cfg = event->attr.config;
145 if (event->attr.type != event->pmu->type)
148 if (cfg >= PERF_MSR_EVENT_MAX)
151 /* unsupported modes and filters */
152 if (event->attr.exclude_user ||
153 event->attr.exclude_kernel ||
154 event->attr.exclude_hv ||
155 event->attr.exclude_idle ||
156 event->attr.exclude_host ||
157 event->attr.exclude_guest ||
158 event->attr.sample_period) /* no sampling */
165 event->hw.event_base = msr[cfg].msr;
166 event->hw.config = cfg;
171 static inline u64 msr_read_counter(struct perf_event *event)
175 if (event->hw.event_base)
176 rdmsrl(event->hw.event_base, now);
182 static void msr_event_update(struct perf_event *event)
187 /* Careful, an NMI might modify the previous event value. */
189 prev = local64_read(&event->hw.prev_count);
190 now = msr_read_counter(event);
192 if (local64_cmpxchg(&event->hw.prev_count, prev, now) != prev)
196 if (unlikely(event->hw.event_base == MSR_SMI_COUNT))
197 delta = sign_extend64(delta, 31);
199 local64_add(delta, &event->count);
202 static void msr_event_start(struct perf_event *event, int flags)
206 now = msr_read_counter(event);
207 local64_set(&event->hw.prev_count, now);
210 static void msr_event_stop(struct perf_event *event, int flags)
212 msr_event_update(event);
215 static void msr_event_del(struct perf_event *event, int flags)
217 msr_event_stop(event, PERF_EF_UPDATE);
220 static int msr_event_add(struct perf_event *event, int flags)
222 if (flags & PERF_EF_START)
223 msr_event_start(event, flags);
228 static struct pmu pmu_msr = {
229 .task_ctx_nr = perf_sw_context,
230 .attr_groups = attr_groups,
231 .event_init = msr_event_init,
232 .add = msr_event_add,
233 .del = msr_event_del,
234 .start = msr_event_start,
235 .stop = msr_event_stop,
236 .read = msr_event_update,
237 .capabilities = PERF_PMU_CAP_NO_INTERRUPT,
240 static int __init msr_init(void)
244 if (!boot_cpu_has(X86_FEATURE_TSC)) {
245 pr_cont("no MSR PMU driver.\n");
249 /* Probe the MSRs. */
250 for (i = PERF_MSR_TSC + 1; i < PERF_MSR_EVENT_MAX; i++) {
254 * Virt sucks arse; you cannot tell if a R/O MSR is present :/
256 if (!msr[i].test(i) || rdmsrl_safe(msr[i].msr, &val))
260 /* List remaining MSRs in the sysfs attrs. */
261 for (i = 0; i < PERF_MSR_EVENT_MAX; i++) {
263 events_attrs[j++] = &msr[i].attr->attr.attr;
265 events_attrs[j] = NULL;
267 perf_pmu_register(&pmu_msr, "msr", -1);
271 device_initcall(msr_init);