arch/x86/kernel/cpu/perf_event_p6.c

   1 #ifdef CONFIG_CPU_SUP_INTEL
   2
   3 /*
   4  * Not sure about some of these
   5  */
   6 static const u64 p6_perfmon_event_map[] =
   7 {
   8   [PERF_COUNT_HW_CPU_CYCLES]            = 0x0079,
   9   [PERF_COUNT_HW_INSTRUCTIONS]          = 0x00c0,
  10   [PERF_COUNT_HW_CACHE_REFERENCES]      = 0x0f2e,
  11   [PERF_COUNT_HW_CACHE_MISSES]          = 0x012e,
  12   [PERF_COUNT_HW_BRANCH_INSTRUCTIONS]   = 0x00c4,
  13   [PERF_COUNT_HW_BRANCH_MISSES]         = 0x00c5,
  14   [PERF_COUNT_HW_BUS_CYCLES]            = 0x0062,
  15 };
  16
  17 static u64 p6_pmu_event_map(int hw_event)
  18 {
  19         return p6_perfmon_event_map[hw_event];
  20 }
  21
  22 /*
  23  * Event setting that is specified not to count anything.
  24  * We use this to effectively disable a counter.
  25  *
  26  * L2_RQSTS with 0 MESI unit mask.
  27  */
  28 #define P6_NOP_EVENT                    0x0000002EULL
  29
  30 static struct event_constraint p6_event_constraints[] =
  31 {
  32         INTEL_EVENT_CONSTRAINT(0xc1, 0x1),      /* FLOPS */
  33         INTEL_EVENT_CONSTRAINT(0x10, 0x1),      /* FP_COMP_OPS_EXE */
  34         INTEL_EVENT_CONSTRAINT(0x11, 0x1),      /* FP_ASSIST */
  35         INTEL_EVENT_CONSTRAINT(0x12, 0x2),      /* MUL */
  36         INTEL_EVENT_CONSTRAINT(0x13, 0x2),      /* DIV */
  37         INTEL_EVENT_CONSTRAINT(0x14, 0x1),      /* CYCLES_DIV_BUSY */
  38         EVENT_CONSTRAINT_END
  39 };
  40
  41 static void p6_pmu_disable_all(void)
  42 {
  43         u64 val;
  44
  45         /* p6 only has one enable register */
  46         rdmsrl(MSR_P6_EVNTSEL0, val);
  47         val &= ~ARCH_PERFMON_EVENTSEL_ENABLE;
  48         wrmsrl(MSR_P6_EVNTSEL0, val);
  49 }
  50
  51 static void p6_pmu_enable_all(int added)
  52 {
  53         unsigned long val;
  54
  55         /* p6 only has one enable register */
  56         rdmsrl(MSR_P6_EVNTSEL0, val);
  57         val |= ARCH_PERFMON_EVENTSEL_ENABLE;
  58         wrmsrl(MSR_P6_EVNTSEL0, val);
  59 }
  60
  61 static inline void
  62 p6_pmu_disable_event(struct perf_event *event)
  63 {
  64         struct cpu_hw_events *cpuc = &__get_cpu_var(cpu_hw_events);
  65         struct hw_perf_event *hwc = &event->hw;
  66         u64 val = P6_NOP_EVENT;
  67
  68         if (cpuc->enabled)
  69                 val |= ARCH_PERFMON_EVENTSEL_ENABLE;
  70
  71         (void)checking_wrmsrl(hwc->config_base + hwc->idx, val);
  72 }
  73
  74 static void p6_pmu_enable_event(struct perf_event *event)
  75 {
  76         struct cpu_hw_events *cpuc = &__get_cpu_var(cpu_hw_events);
  77         struct hw_perf_event *hwc = &event->hw;
  78         u64 val;
  79
  80         val = hwc->config;
  81         if (cpuc->enabled)
  82                 val |= ARCH_PERFMON_EVENTSEL_ENABLE;
  83
  84         (void)checking_wrmsrl(hwc->config_base + hwc->idx, val);
  85 }
  86
  87 static __initconst const struct x86_pmu p6_pmu = {
  88         .name                   = "p6",
  89         .handle_irq             = x86_pmu_handle_irq,
  90         .disable_all            = p6_pmu_disable_all,
  91         .enable_all             = p6_pmu_enable_all,
  92         .enable                 = p6_pmu_enable_event,
  93         .disable                = p6_pmu_disable_event,
  94         .hw_config              = x86_pmu_hw_config,
  95         .schedule_events        = x86_schedule_events,
  96         .eventsel               = MSR_P6_EVNTSEL0,
  97         .perfctr                = MSR_P6_PERFCTR0,
  98         .event_map              = p6_pmu_event_map,
  99         .max_events             = ARRAY_SIZE(p6_perfmon_event_map),
 100         .apic                   = 1,
 101         .max_period             = (1ULL << 31) - 1,
 102         .version                = 0,
 103         .num_counters           = 2,
 104         /*
 105          * Events have 40 bits implemented. However they are designed such
 106          * that bits [32-39] are sign extensions of bit 31. As such the
 107          * effective width of a event for P6-like PMU is 32 bits only.
 108          *
 109          * See IA-32 Intel Architecture Software developer manual Vol 3B
 110          */
 111         .cntval_bits            = 32,
 112         .cntval_mask            = (1ULL << 32) - 1,
 113         .get_event_constraints  = x86_get_event_constraints,
 114         .event_constraints      = p6_event_constraints,
 115 };
 116
 117 static __init int p6_pmu_init(void)
 118 {
 119         switch (boot_cpu_data.x86_model) {
 120         case 1:
 121         case 3:  /* Pentium Pro */
 122         case 5:
 123         case 6:  /* Pentium II */
 124         case 7:
 125         case 8:
 126         case 11: /* Pentium III */
 127         case 9:
 128         case 13:
 129                 /* Pentium M */
 130                 break;
 131         default:
 132                 pr_cont("unsupported p6 CPU model %d ",
 133                         boot_cpu_data.x86_model);
 134                 return -ENODEV;
 135         }
 136
 137         x86_pmu = p6_pmu;
 138
 139         return 0;
 140 }
 141
 142 #endif /* CONFIG_CPU_SUP_INTEL */