arch/x86/events/intel/p6.c

   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
 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
 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
 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
 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
 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
 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
 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 }