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 u64 p6_pmu_raw_event(u64 hw_event)
  31 {
  32 #define P6_EVNTSEL_EVENT_MASK           0x000000FFULL
  33 #define P6_EVNTSEL_UNIT_MASK            0x0000FF00ULL
  34 #define P6_EVNTSEL_EDGE_MASK            0x00040000ULL
  35 #define P6_EVNTSEL_INV_MASK             0x00800000ULL
  36 #define P6_EVNTSEL_REG_MASK             0xFF000000ULL
  37
  38 #define P6_EVNTSEL_MASK                 \
  39         (P6_EVNTSEL_EVENT_MASK |        \
  40          P6_EVNTSEL_UNIT_MASK  |        \
  41          P6_EVNTSEL_EDGE_MASK  |        \
  42          P6_EVNTSEL_INV_MASK   |        \
  43          P6_EVNTSEL_REG_MASK)
  44
  45         return hw_event & P6_EVNTSEL_MASK;
  46 }
  47
  48 static struct event_constraint p6_event_constraints[] =
  49 {
  50         INTEL_EVENT_CONSTRAINT(0xc1, 0x1),      /* FLOPS */
  51         INTEL_EVENT_CONSTRAINT(0x10, 0x1),      /* FP_COMP_OPS_EXE */
  52         INTEL_EVENT_CONSTRAINT(0x11, 0x1),      /* FP_ASSIST */
  53         INTEL_EVENT_CONSTRAINT(0x12, 0x2),      /* MUL */
  54         INTEL_EVENT_CONSTRAINT(0x13, 0x2),      /* DIV */
  55         INTEL_EVENT_CONSTRAINT(0x14, 0x1),      /* CYCLES_DIV_BUSY */
  56         EVENT_CONSTRAINT_END
  57 };
  58
  59 static void p6_pmu_disable_all(void)
  60 {
  61         u64 val;
  62
  63         /* p6 only has one enable register */
  64         rdmsrl(MSR_P6_EVNTSEL0, val);
  65         val &= ~ARCH_PERFMON_EVENTSEL_ENABLE;
  66         wrmsrl(MSR_P6_EVNTSEL0, val);
  67 }
  68
  69 static void p6_pmu_enable_all(void)
  70 {
  71         unsigned long val;
  72
  73         /* p6 only has one enable register */
  74         rdmsrl(MSR_P6_EVNTSEL0, val);
  75         val |= ARCH_PERFMON_EVENTSEL_ENABLE;
  76         wrmsrl(MSR_P6_EVNTSEL0, val);
  77 }
  78
  79 static inline void
  80 p6_pmu_disable_event(struct perf_event *event)
  81 {
  82         struct cpu_hw_events *cpuc = &__get_cpu_var(cpu_hw_events);
  83         struct hw_perf_event *hwc = &event->hw;
  84         u64 val = P6_NOP_EVENT;
  85
  86         if (cpuc->enabled)
  87                 val |= ARCH_PERFMON_EVENTSEL_ENABLE;
  88
  89         (void)checking_wrmsrl(hwc->config_base + hwc->idx, val);
  90 }
  91
  92 static void p6_pmu_enable_event(struct perf_event *event)
  93 {
  94         struct cpu_hw_events *cpuc = &__get_cpu_var(cpu_hw_events);
  95         struct hw_perf_event *hwc = &event->hw;
  96         u64 val;
  97
  98         val = hwc->config;
  99         if (cpuc->enabled)
 100                 val |= ARCH_PERFMON_EVENTSEL_ENABLE;
 101
 102         (void)checking_wrmsrl(hwc->config_base + hwc->idx, val);
 103 }
 104
 105 static __initconst struct x86_pmu p6_pmu = {
 106         .name                   = "p6",
 107         .handle_irq             = x86_pmu_handle_irq,
 108         .disable_all            = p6_pmu_disable_all,
 109         .enable_all             = p6_pmu_enable_all,
 110         .enable                 = p6_pmu_enable_event,
 111         .disable                = p6_pmu_disable_event,
 112         .eventsel               = MSR_P6_EVNTSEL0,
 113         .perfctr                = MSR_P6_PERFCTR0,
 114         .event_map              = p6_pmu_event_map,
 115         .raw_event              = p6_pmu_raw_event,
 116         .max_events             = ARRAY_SIZE(p6_perfmon_event_map),
 117         .apic                   = 1,
 118         .max_period             = (1ULL << 31) - 1,
 119         .version                = 0,
 120         .num_events             = 2,
 121         /*
 122          * Events have 40 bits implemented. However they are designed such
 123          * that bits [32-39] are sign extensions of bit 31. As such the
 124          * effective width of a event for P6-like PMU is 32 bits only.
 125          *
 126          * See IA-32 Intel Architecture Software developer manual Vol 3B
 127          */
 128         .event_bits             = 32,
 129         .event_mask             = (1ULL << 32) - 1,
 130         .get_event_constraints  = x86_get_event_constraints,
 131         .event_constraints      = p6_event_constraints,
 132 };
 133
 134 static __init int p6_pmu_init(void)
 135 {
 136         switch (boot_cpu_data.x86_model) {
 137         case 1:
 138         case 3:  /* Pentium Pro */
 139         case 5:
 140         case 6:  /* Pentium II */
 141         case 7:
 142         case 8:
 143         case 11: /* Pentium III */
 144         case 9:
 145         case 13:
 146                 /* Pentium M */
 147                 break;
 148         default:
 149                 pr_cont("unsupported p6 CPU model %d ",
 150                         boot_cpu_data.x86_model);
 151                 return -ENODEV;
 152         }
 153
 154         x86_pmu = p6_pmu;
 155
 156         return 0;
 157 }
 158
 159 #endif /* CONFIG_CPU_SUP_INTEL */