tools/testing/selftests/powerpc/cache_shape/cache_shape.c

   1 /*
   2  * Copyright 2017, Michael Ellerman, IBM Corp.
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License
   6  * as published by the Free Software Foundation; either version
   7  * 2 of the License, or (at your option) any later version.
   8  */
   9
  10 #include <elf.h>
  11 #include <errno.h>
  12 #include <fcntl.h>
  13 #include <link.h>
  14 #include <stdio.h>
  15 #include <stdlib.h>
  16 #include <string.h>
  17 #include <sys/stat.h>
  18 #include <sys/types.h>
  19 #include <sys/wait.h>
  20 #include <unistd.h>
  21
  22 #include "utils.h"
  23
  24 #ifndef AT_L1I_CACHESIZE
  25 #define AT_L1I_CACHESIZE        40
  26 #define AT_L1I_CACHEGEOMETRY    41
  27 #define AT_L1D_CACHESIZE        42
  28 #define AT_L1D_CACHEGEOMETRY    43
  29 #define AT_L2_CACHESIZE         44
  30 #define AT_L2_CACHEGEOMETRY     45
  31 #define AT_L3_CACHESIZE         46
  32 #define AT_L3_CACHEGEOMETRY     47
  33 #endif
  34
  35 static void print_size(const char *label, uint32_t val)
  36 {
  37         printf("%s cache size: %#10x %10dB %10dK\n", label, val, val, val / 1024);
  38 }
  39
  40 static void print_geo(const char *label, uint32_t val)
  41 {
  42         uint16_t assoc;
  43
  44         printf("%s line size:  %#10x       ", label, val & 0xFFFF);
  45
  46         assoc = val >> 16;
  47         if (assoc)
  48                 printf("%u-way", assoc);
  49         else
  50                 printf("fully");
  51
  52         printf(" associative\n");
  53 }
  54
  55 static int test_cache_shape()
  56 {
  57         static char buffer[4096];
  58         ElfW(auxv_t) *p;
  59         int found;
  60
  61         FAIL_IF(read_auxv(buffer, sizeof(buffer)));
  62
  63         found = 0;
  64
  65         p = find_auxv_entry(AT_L1I_CACHESIZE, buffer);
  66         if (p) {
  67                 found++;
  68                 print_size("L1I ", (uint32_t)p->a_un.a_val);
  69         }
  70
  71         p = find_auxv_entry(AT_L1I_CACHEGEOMETRY, buffer);
  72         if (p) {
  73                 found++;
  74                 print_geo("L1I ", (uint32_t)p->a_un.a_val);
  75         }
  76
  77         p = find_auxv_entry(AT_L1D_CACHESIZE, buffer);
  78         if (p) {
  79                 found++;
  80                 print_size("L1D ", (uint32_t)p->a_un.a_val);
  81         }
  82
  83         p = find_auxv_entry(AT_L1D_CACHEGEOMETRY, buffer);
  84         if (p) {
  85                 found++;
  86                 print_geo("L1D ", (uint32_t)p->a_un.a_val);
  87         }
  88
  89         p = find_auxv_entry(AT_L2_CACHESIZE, buffer);
  90         if (p) {
  91                 found++;
  92                 print_size("L2  ", (uint32_t)p->a_un.a_val);
  93         }
  94
  95         p = find_auxv_entry(AT_L2_CACHEGEOMETRY, buffer);
  96         if (p) {
  97                 found++;
  98                 print_geo("L2  ", (uint32_t)p->a_un.a_val);
  99         }
 100
 101         p = find_auxv_entry(AT_L3_CACHESIZE, buffer);
 102         if (p) {
 103                 found++;
 104                 print_size("L3  ", (uint32_t)p->a_un.a_val);
 105         }
 106
 107         p = find_auxv_entry(AT_L3_CACHEGEOMETRY, buffer);
 108         if (p) {
 109                 found++;
 110                 print_geo("L3  ", (uint32_t)p->a_un.a_val);
 111         }
 112
 113         /* If we found none we're probably on a system where they don't exist */
 114         SKIP_IF(found == 0);
 115
 116         /* But if we found any, we expect to find them all */
 117         FAIL_IF(found != 8);
 118
 119         return 0;
 120 }
 121
 122 int main(void)
 123 {
 124         return test_harness(test_cache_shape, "cache_shape");
 125 }