arch/powerpc/kernel/e500-pmu.c

   1 /*
   2  * Performance counter support for e500 family processors.
   3  *
   4  * Copyright 2008-2009 Paul Mackerras, IBM Corporation.
   5  * Copyright 2010 Freescale Semiconductor, Inc.
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License
   9  * as published by the Free Software Foundation; either version
  10  * 2 of the License, or (at your option) any later version.
  11  */
  12 #include <linux/string.h>
  13 #include <linux/perf_event.h>
  14 #include <asm/reg.h>
  15 #include <asm/cputable.h>
  16
  17 /*
  18  * Map of generic hardware event types to hardware events
  19  * Zero if unsupported
  20  */
  21 static int e500_generic_events[] = {
  22         [PERF_COUNT_HW_CPU_CYCLES] = 1,
  23         [PERF_COUNT_HW_INSTRUCTIONS] = 2,
  24         [PERF_COUNT_HW_CACHE_MISSES] = 41, /* Data L1 cache reloads */
  25         [PERF_COUNT_HW_BRANCH_INSTRUCTIONS] = 12,
  26         [PERF_COUNT_HW_BRANCH_MISSES] = 15,
  27 };
  28
  29 #define C(x)    PERF_COUNT_HW_CACHE_##x
  30
  31 /*
  32  * Table of generalized cache-related events.
  33  * 0 means not supported, -1 means nonsensical, other values
  34  * are event codes.
  35  */
  36 static int e500_cache_events[C(MAX)][C(OP_MAX)][C(RESULT_MAX)] = {
  37         /*
  38          * D-cache misses are not split into read/write/prefetch;
  39          * use raw event 41.
  40          */
  41         [C(L1D)] = {            /*      RESULT_ACCESS   RESULT_MISS */
  42                 [C(OP_READ)] = {        27,             0       },
  43                 [C(OP_WRITE)] = {       28,             0       },
  44                 [C(OP_PREFETCH)] = {    29,             0       },
  45         },
  46         [C(L1I)] = {            /*      RESULT_ACCESS   RESULT_MISS */
  47                 [C(OP_READ)] = {        2,              60      },
  48                 [C(OP_WRITE)] = {       -1,             -1      },
  49                 [C(OP_PREFETCH)] = {    0,              0       },
  50         },
  51         /*
  52          * Assuming LL means L2, it's not a good match for this model.
  53          * It allocates only on L1 castout or explicit prefetch, and
  54          * does not have separate read/write events (but it does have
  55          * separate instruction/data events).
  56          */
  57         [C(LL)] = {             /*      RESULT_ACCESS   RESULT_MISS */
  58                 [C(OP_READ)] = {        0,              0       },
  59                 [C(OP_WRITE)] = {       0,              0       },
  60                 [C(OP_PREFETCH)] = {    0,              0       },
  61         },
  62         /*
  63          * There are data/instruction MMU misses, but that's a miss on
  64          * the chip's internal level-one TLB which is probably not
  65          * what the user wants.  Instead, unified level-two TLB misses
  66          * are reported here.
  67          */
  68         [C(DTLB)] = {           /*      RESULT_ACCESS   RESULT_MISS */
  69                 [C(OP_READ)] = {        26,             66      },
  70                 [C(OP_WRITE)] = {       -1,             -1      },
  71                 [C(OP_PREFETCH)] = {    -1,             -1      },
  72         },
  73         [C(BPU)] = {            /*      RESULT_ACCESS   RESULT_MISS */
  74                 [C(OP_READ)] = {        12,             15      },
  75                 [C(OP_WRITE)] = {       -1,             -1      },
  76                 [C(OP_PREFETCH)] = {    -1,             -1      },
  77         },
  78 };
  79
  80 static int num_events = 128;
  81
  82 /* Upper half of event id is PMLCb, for threshold events */
  83 static u64 e500_xlate_event(u64 event_id)
  84 {
  85         u32 event_low = (u32)event_id;
  86         u64 ret;
  87
  88         if (event_low >= num_events)
  89                 return 0;
  90
  91         ret = FSL_EMB_EVENT_VALID;
  92
  93         if (event_low >= 76 && event_low <= 81) {
  94                 ret |= FSL_EMB_EVENT_RESTRICTED;
  95                 ret |= event_id &
  96                        (FSL_EMB_EVENT_THRESHMUL | FSL_EMB_EVENT_THRESH);
  97         } else if (event_id &
  98                    (FSL_EMB_EVENT_THRESHMUL | FSL_EMB_EVENT_THRESH)) {
  99                 /* Threshold requested on non-threshold event */
 100                 return 0;
 101         }
 102
 103         return ret;
 104 }
 105
 106 static struct fsl_emb_pmu e500_pmu = {
 107         .name                   = "e500 family",
 108         .n_counter              = 4,
 109         .n_restricted           = 2,
 110         .xlate_event            = e500_xlate_event,
 111         .n_generic              = ARRAY_SIZE(e500_generic_events),
 112         .generic_events         = e500_generic_events,
 113         .cache_events           = &e500_cache_events,
 114 };
 115
 116 static int init_e500_pmu(void)
 117 {
 118         if (!cur_cpu_spec->oprofile_cpu_type)
 119                 return -ENODEV;
 120
 121         if (!strcmp(cur_cpu_spec->oprofile_cpu_type, "ppc/e500mc"))
 122                 num_events = 256;
 123         else if (strcmp(cur_cpu_spec->oprofile_cpu_type, "ppc/e500"))
 124                 return -ENODEV;
 125
 126         return register_fsl_emb_pmu(&e500_pmu);
 127 }
 128
 129 early_initcall(init_e500_pmu);