1 // SPDX-License-Identifier: GPL-2.0 2 #include <linux/perf_event.h> 3 #include <linux/types.h> 4 5 #include "../perf_event.h" 6 7 /* 8 * Not sure about some of these 9 */ 10 static const u64 p6_perfmon_event_map[] = 11 { 12 [PERF_COUNT_HW_CPU_CYCLES] = 0x0079, /* CPU_CLK_UNHALTED */ 13 [PERF_COUNT_HW_INSTRUCTIONS] = 0x00c0, /* INST_RETIRED */ 14 [PERF_COUNT_HW_CACHE_REFERENCES] = 0x0f2e, /* L2_RQSTS:M:E:S:I */ 15 [PERF_COUNT_HW_CACHE_MISSES] = 0x012e, /* L2_RQSTS:I */ 16 [PERF_COUNT_HW_BRANCH_INSTRUCTIONS] = 0x00c4, /* BR_INST_RETIRED */ 17 [PERF_COUNT_HW_BRANCH_MISSES] = 0x00c5, /* BR_MISS_PRED_RETIRED */ 18 [PERF_COUNT_HW_BUS_CYCLES] = 0x0062, /* BUS_DRDY_CLOCKS */ 19 [PERF_COUNT_HW_STALLED_CYCLES_FRONTEND] = 0x00a2, /* RESOURCE_STALLS */ 20 21 }; 22 23 static const u64 __initconst p6_hw_cache_event_ids 24 [PERF_COUNT_HW_CACHE_MAX] 25 [PERF_COUNT_HW_CACHE_OP_MAX] 26 [PERF_COUNT_HW_CACHE_RESULT_MAX] = 27 { 28 [ C(L1D) ] = { 29 [ C(OP_READ) ] = { 30 [ C(RESULT_ACCESS) ] = 0x0043, /* DATA_MEM_REFS */ 31 [ C(RESULT_MISS) ] = 0x0045, /* DCU_LINES_IN */ 32 }, 33 [ C(OP_WRITE) ] = { 34 [ C(RESULT_ACCESS) ] = 0, 35 [ C(RESULT_MISS) ] = 0x0f29, /* L2_LD:M:E:S:I */ 36 }, 37 [ C(OP_PREFETCH) ] = { 38 [ C(RESULT_ACCESS) ] = 0, 39 [ C(RESULT_MISS) ] = 0, 40 }, 41 }, 42 [ C(L1I ) ] = { 43 [ C(OP_READ) ] = { 44 [ C(RESULT_ACCESS) ] = 0x0080, /* IFU_IFETCH */ 45 [ C(RESULT_MISS) ] = 0x0f28, /* L2_IFETCH:M:E:S:I */ 46 }, 47 [ C(OP_WRITE) ] = { 48 [ C(RESULT_ACCESS) ] = -1, 49 [ C(RESULT_MISS) ] = -1, 50 }, 51 [ C(OP_PREFETCH) ] = { 52 [ C(RESULT_ACCESS) ] = 0, 53 [ C(RESULT_MISS) ] = 0, 54 }, 55 }, 56 [ C(LL ) ] = { 57 [ C(OP_READ) ] = { 58 [ C(RESULT_ACCESS) ] = 0, 59 [ C(RESULT_MISS) ] = 0, 60 }, 61 [ C(OP_WRITE) ] = { 62 [ C(RESULT_ACCESS) ] = 0, 63 [ C(RESULT_MISS) ] = 0x0025, /* L2_M_LINES_INM */ 64 }, 65 [ C(OP_PREFETCH) ] = { 66 [ C(RESULT_ACCESS) ] = 0, 67 [ C(RESULT_MISS) ] = 0, 68 }, 69 }, 70 [ C(DTLB) ] = { 71 [ C(OP_READ) ] = { 72 [ C(RESULT_ACCESS) ] = 0x0043, /* DATA_MEM_REFS */ 73 [ C(RESULT_MISS) ] = 0, 74 }, 75 [ C(OP_WRITE) ] = { 76 [ C(RESULT_ACCESS) ] = 0, 77 [ C(RESULT_MISS) ] = 0, 78 }, 79 [ C(OP_PREFETCH) ] = { 80 [ C(RESULT_ACCESS) ] = 0, 81 [ C(RESULT_MISS) ] = 0, 82 }, 83 }, 84 [ C(ITLB) ] = { 85 [ C(OP_READ) ] = { 86 [ C(RESULT_ACCESS) ] = 0x0080, /* IFU_IFETCH */ 87 [ C(RESULT_MISS) ] = 0x0085, /* ITLB_MISS */ 88 }, 89 [ C(OP_WRITE) ] = { 90 [ C(RESULT_ACCESS) ] = -1, 91 [ C(RESULT_MISS) ] = -1, 92 }, 93 [ C(OP_PREFETCH) ] = { 94 [ C(RESULT_ACCESS) ] = -1, 95 [ C(RESULT_MISS) ] = -1, 96 }, 97 }, 98 [ C(BPU ) ] = { 99 [ C(OP_READ) ] = { 100 [ C(RESULT_ACCESS) ] = 0x00c4, /* BR_INST_RETIRED */ 101 [ C(RESULT_MISS) ] = 0x00c5, /* BR_MISS_PRED_RETIRED */ 102 }, 103 [ C(OP_WRITE) ] = { 104 [ C(RESULT_ACCESS) ] = -1, 105 [ C(RESULT_MISS) ] = -1, 106 }, 107 [ C(OP_PREFETCH) ] = { 108 [ C(RESULT_ACCESS) ] = -1, 109 [ C(RESULT_MISS) ] = -1, 110 }, 111 }, 112 }; 113 p6_pmu_event_map(int hw_event)114 static u64 p6_pmu_event_map(int hw_event) 115 { 116 return p6_perfmon_event_map[hw_event]; 117 } 118 119 /* 120 * Event setting that is specified not to count anything. 121 * We use this to effectively disable a counter. 122 * 123 * L2_RQSTS with 0 MESI unit mask. 124 */ 125 #define P6_NOP_EVENT 0x0000002EULL 126 127 static struct event_constraint p6_event_constraints[] = 128 { 129 INTEL_EVENT_CONSTRAINT(0xc1, 0x1), /* FLOPS */ 130 INTEL_EVENT_CONSTRAINT(0x10, 0x1), /* FP_COMP_OPS_EXE */ 131 INTEL_EVENT_CONSTRAINT(0x11, 0x2), /* FP_ASSIST */ 132 INTEL_EVENT_CONSTRAINT(0x12, 0x2), /* MUL */ 133 INTEL_EVENT_CONSTRAINT(0x13, 0x2), /* DIV */ 134 INTEL_EVENT_CONSTRAINT(0x14, 0x1), /* CYCLES_DIV_BUSY */ 135 EVENT_CONSTRAINT_END 136 }; 137 p6_pmu_disable_all(void)138 static void p6_pmu_disable_all(void) 139 { 140 u64 val; 141 142 /* p6 only has one enable register */ 143 rdmsrl(MSR_P6_EVNTSEL0, val); 144 val &= ~ARCH_PERFMON_EVENTSEL_ENABLE; 145 wrmsrl(MSR_P6_EVNTSEL0, val); 146 } 147 p6_pmu_enable_all(int added)148 static void p6_pmu_enable_all(int added) 149 { 150 unsigned long val; 151 152 /* p6 only has one enable register */ 153 rdmsrl(MSR_P6_EVNTSEL0, val); 154 val |= ARCH_PERFMON_EVENTSEL_ENABLE; 155 wrmsrl(MSR_P6_EVNTSEL0, val); 156 } 157 158 static inline void p6_pmu_disable_event(struct perf_event * event)159 p6_pmu_disable_event(struct perf_event *event) 160 { 161 struct hw_perf_event *hwc = &event->hw; 162 u64 val = P6_NOP_EVENT; 163 164 (void)wrmsrl_safe(hwc->config_base, val); 165 } 166 p6_pmu_enable_event(struct perf_event * event)167 static void p6_pmu_enable_event(struct perf_event *event) 168 { 169 struct hw_perf_event *hwc = &event->hw; 170 u64 val; 171 172 val = hwc->config; 173 174 /* 175 * p6 only has a global event enable, set on PerfEvtSel0 176 * We "disable" events by programming P6_NOP_EVENT 177 * and we rely on p6_pmu_enable_all() being called 178 * to actually enable the events. 179 */ 180 181 (void)wrmsrl_safe(hwc->config_base, val); 182 } 183 184 PMU_FORMAT_ATTR(event, "config:0-7" ); 185 PMU_FORMAT_ATTR(umask, "config:8-15" ); 186 PMU_FORMAT_ATTR(edge, "config:18" ); 187 PMU_FORMAT_ATTR(pc, "config:19" ); 188 PMU_FORMAT_ATTR(inv, "config:23" ); 189 PMU_FORMAT_ATTR(cmask, "config:24-31" ); 190 191 static struct attribute *intel_p6_formats_attr[] = { 192 &format_attr_event.attr, 193 &format_attr_umask.attr, 194 &format_attr_edge.attr, 195 &format_attr_pc.attr, 196 &format_attr_inv.attr, 197 &format_attr_cmask.attr, 198 NULL, 199 }; 200 201 static __initconst const struct x86_pmu p6_pmu = { 202 .name = "p6", 203 .handle_irq = x86_pmu_handle_irq, 204 .disable_all = p6_pmu_disable_all, 205 .enable_all = p6_pmu_enable_all, 206 .enable = p6_pmu_enable_event, 207 .disable = p6_pmu_disable_event, 208 .hw_config = x86_pmu_hw_config, 209 .schedule_events = x86_schedule_events, 210 .eventsel = MSR_P6_EVNTSEL0, 211 .perfctr = MSR_P6_PERFCTR0, 212 .event_map = p6_pmu_event_map, 213 .max_events = ARRAY_SIZE(p6_perfmon_event_map), 214 .apic = 1, 215 .max_period = (1ULL << 31) - 1, 216 .version = 0, 217 .num_counters = 2, 218 /* 219 * Events have 40 bits implemented. However they are designed such 220 * that bits [32-39] are sign extensions of bit 31. As such the 221 * effective width of a event for P6-like PMU is 32 bits only. 222 * 223 * See IA-32 Intel Architecture Software developer manual Vol 3B 224 */ 225 .cntval_bits = 32, 226 .cntval_mask = (1ULL << 32) - 1, 227 .get_event_constraints = x86_get_event_constraints, 228 .event_constraints = p6_event_constraints, 229 230 .format_attrs = intel_p6_formats_attr, 231 .events_sysfs_show = intel_event_sysfs_show, 232 233 }; 234 p6_pmu_rdpmc_quirk(void)235 static __init void p6_pmu_rdpmc_quirk(void) 236 { 237 if (boot_cpu_data.x86_stepping < 9) { 238 /* 239 * PPro erratum 26; fixed in stepping 9 and above. 240 */ 241 pr_warn("Userspace RDPMC support disabled due to a CPU erratum\n"); 242 x86_pmu.attr_rdpmc_broken = 1; 243 x86_pmu.attr_rdpmc = 0; 244 } 245 } 246 p6_pmu_init(void)247 __init int p6_pmu_init(void) 248 { 249 x86_pmu = p6_pmu; 250 251 switch (boot_cpu_data.x86_model) { 252 case 1: /* Pentium Pro */ 253 x86_add_quirk(p6_pmu_rdpmc_quirk); 254 break; 255 256 case 3: /* Pentium II - Klamath */ 257 case 5: /* Pentium II - Deschutes */ 258 case 6: /* Pentium II - Mendocino */ 259 break; 260 261 case 7: /* Pentium III - Katmai */ 262 case 8: /* Pentium III - Coppermine */ 263 case 10: /* Pentium III Xeon */ 264 case 11: /* Pentium III - Tualatin */ 265 break; 266 267 case 9: /* Pentium M - Banias */ 268 case 13: /* Pentium M - Dothan */ 269 break; 270 271 default: 272 pr_cont("unsupported p6 CPU model %d ", boot_cpu_data.x86_model); 273 return -ENODEV; 274 } 275 276 memcpy(hw_cache_event_ids, p6_hw_cache_event_ids, 277 sizeof(hw_cache_event_ids)); 278 279 return 0; 280 } 281
