target/linux/lantiq/patches/810-ar9-cache-split.patch

   1 --- a/arch/mips/Kconfig
   2 +++ b/arch/mips/Kconfig
   3 @@ -1844,6 +1844,28 @@
   4         help
   5           IFX included extensions in APRP
   6
   7 +config IFX_VPE_CACHE_SPLIT
   8 +       bool "IFX Cache Split Ways"
   9 +       depends on IFX_VPE_EXT
  10 +       help
  11 +         IFX extension for reserving (splitting) cache ways among VPEs. You must
  12 +         give kernel command line arguments vpe_icache_shared=0 or
  13 +         vpe_dcache_shared=0 to enable splitting of icache or dcache
  14 +         respectively. Then you can specify which cache ways should be
  15 +         assigned to which VPE. There are total 8 cache ways, 4 each
  16 +         for dcache and icache: dcache_way0, dcache_way1,dcache_way2,
  17 +         dcache_way3 and icache_way0,icache_way1, icache_way2,icache_way3.
  18 +
  19 +         For example, if you specify vpe_icache_shared=0 and icache_way2=1,
  20 +         then the 3rd icache way will be assigned to VPE0 and denied in VPE1.
  21 +
  22 +         For icache, software is required to make at least one cache way available
  23 +         for a VPE at all times i.e., one can't assign all the icache ways to one
  24 +         VPE.
  25 +
  26 +         By default, vpe_dcache_shared and vpe_icache_shared are set to 1
  27 +         (i.e., both icache and dcache are shared among VPEs)
  28 +
  29  config PERFCTRS
  30         bool "34K Performance counters"
  31         depends on MIPS_MT && PROC_FS
  32 --- a/arch/mips/kernel/vpe.c
  33 +++ b/arch/mips/kernel/vpe.c
  34 @@ -128,6 +128,13 @@
  35  EXPORT_SYMBOL(vpe1_wdog_timeout);
  36
  37  #endif
  38 +
  39 +#ifdef CONFIG_IFX_VPE_CACHE_SPLIT /* Code for splitting the cache ways among VPEs. */
  40 +extern int vpe_icache_shared,vpe_dcache_shared;
  41 +extern int icache_way0,icache_way1,icache_way2,icache_way3;
  42 +extern int dcache_way0,dcache_way1,dcache_way2,dcache_way3;
  43 +#endif
  44 +
  45  /* grab the likely amount of memory we will need. */
  46  #ifdef CONFIG_MIPS_VPE_LOADER_TOM
  47  #define P_SIZE (2 * 1024 * 1024)
  48 @@ -866,6 +873,65 @@
  49         /* enable this VPE */
  50         write_vpe_c0_vpeconf0(read_vpe_c0_vpeconf0() | VPECONF0_VPA);
  51
  52 +#ifdef CONFIG_IFX_VPE_CACHE_SPLIT
  53 +       if ( (!vpe_icache_shared) || (!vpe_dcache_shared) ) {
  54 +
  55 +               /* PCP bit must be 1 to split the cache */
  56 +               if(read_c0_mvpconf0() & MVPCONF0_PCP) {
  57 +
  58 +                       if ( !vpe_icache_shared ){
  59 +                               write_vpe_c0_vpeconf0((read_vpe_c0_vpeconf0()) & ~VPECONF0_ICS);
  60 +
  61 +                               /*
  62 +                                * If any cache way is 1, then that way is denied
  63 +                                * in VPE1. Otherwise assign that way to VPE1.
  64 +                                */
  65 +                               if (!icache_way0)
  66 +                                       write_vpe_c0_vpeopt(read_vpe_c0_vpeopt() | VPEOPT_IWX0 );
  67 +                               else
  68 +                                       write_vpe_c0_vpeopt(read_vpe_c0_vpeopt() & ~VPEOPT_IWX0 );
  69 +                               if (!icache_way1)
  70 +                                       write_vpe_c0_vpeopt(read_vpe_c0_vpeopt() | VPEOPT_IWX1 );
  71 +                               else
  72 +                                       write_vpe_c0_vpeopt(read_vpe_c0_vpeopt() & ~VPEOPT_IWX1 );
  73 +                               if (!icache_way2)
  74 +                                       write_vpe_c0_vpeopt(read_vpe_c0_vpeopt() | VPEOPT_IWX2 );
  75 +                               else
  76 +                                       write_vpe_c0_vpeopt(read_vpe_c0_vpeopt() & ~VPEOPT_IWX2 );
  77 +                               if (!icache_way3)
  78 +                                       write_vpe_c0_vpeopt(read_vpe_c0_vpeopt() | VPEOPT_IWX3 );
  79 +                               else
  80 +                                       write_vpe_c0_vpeopt(read_vpe_c0_vpeopt() & ~VPEOPT_IWX3 );
  81 +                       }
  82 +
  83 +                       if ( !vpe_dcache_shared ) {
  84 +                               write_vpe_c0_vpeconf0((read_vpe_c0_vpeconf0()) & ~VPECONF0_DCS);
  85 +
  86 +                               /*
  87 +                                * If any cache way is 1, then that way is denied
  88 +                                * in VPE1. Otherwise assign that way to VPE1.
  89 +                                */
  90 +                               if (!dcache_way0)
  91 +                                       write_vpe_c0_vpeopt(read_vpe_c0_vpeopt() | VPEOPT_DWX0 );
  92 +                               else
  93 +                                       write_vpe_c0_vpeopt(read_vpe_c0_vpeopt() & ~VPEOPT_DWX0 );
  94 +                               if (!dcache_way1)
  95 +                                       write_vpe_c0_vpeopt(read_vpe_c0_vpeopt() | VPEOPT_DWX1 );
  96 +                               else
  97 +                                       write_vpe_c0_vpeopt(read_vpe_c0_vpeopt() & ~VPEOPT_DWX1 );
  98 +                               if (!dcache_way2)
  99 +                                       write_vpe_c0_vpeopt(read_vpe_c0_vpeopt() | VPEOPT_DWX2 );
 100 +                               else
 101 +                                       write_vpe_c0_vpeopt(read_vpe_c0_vpeopt() & ~VPEOPT_DWX2 );
 102 +                               if (!dcache_way3)
 103 +                                       write_vpe_c0_vpeopt(read_vpe_c0_vpeopt() | VPEOPT_DWX3 );
 104 +                               else
 105 +                                       write_vpe_c0_vpeopt(read_vpe_c0_vpeopt() & ~VPEOPT_DWX3 );
 106 +                       }
 107 +               }
 108 +       }
 109 +#endif /* endif CONFIG_IFX_VPE_CACHE_SPLIT */
 110 +
 111         /* clear out any left overs from a previous program */
 112         write_vpe_c0_status(0);
 113         write_vpe_c0_cause(0);
 114 --- a/arch/mips/mm/c-r4k.c
 115 +++ b/arch/mips/mm/c-r4k.c
 116 @@ -1347,6 +1347,106 @@
 117  __setup("coherentio", setcoherentio);
 118  #endif
 119
 120 +#ifdef CONFIG_IFX_VPE_CACHE_SPLIT /* Code for splitting the cache ways among VPEs. */
 121 +
 122 +#include <asm/mipsmtregs.h>
 123 +
 124 +/*
 125 + * By default, vpe_icache_shared and vpe_dcache_shared
 126 + * values are 1 i.e., both icache and dcache are shared
 127 + * among the VPEs.
 128 + */
 129 +
 130 +int vpe_icache_shared = 1;
 131 +static int __init vpe_icache_shared_val(char *str)
 132 +{
 133 +       get_option(&str, &vpe_icache_shared);
 134 +       return 1;
 135 +}
 136 +__setup("vpe_icache_shared=", vpe_icache_shared_val);
 137 +EXPORT_SYMBOL(vpe_icache_shared);
 138 +
 139 +int vpe_dcache_shared = 1;
 140 +static int __init vpe_dcache_shared_val(char *str)
 141 +{
 142 +       get_option(&str, &vpe_dcache_shared);
 143 +       return 1;
 144 +}
 145 +__setup("vpe_dcache_shared=", vpe_dcache_shared_val);
 146 +EXPORT_SYMBOL(vpe_dcache_shared);
 147 +
 148 +/*
 149 + * Software is required to make atleast one icache
 150 + * way available for a VPE at all times i.e., one
 151 + * can't assign all the icache ways to one VPE.
 152 + */
 153 +
 154 +int icache_way0 = 0;
 155 +static int __init icache_way0_val(char *str)
 156 +{
 157 +       get_option(&str, &icache_way0);
 158 +       return 1;
 159 +}
 160 +__setup("icache_way0=", icache_way0_val);
 161 +
 162 +int icache_way1 = 0;
 163 +static int __init icache_way1_val(char *str)
 164 +{
 165 +       get_option(&str, &icache_way1);
 166 +       return 1;
 167 +}
 168 +__setup("icache_way1=", icache_way1_val);
 169 +
 170 +int icache_way2 = 0;
 171 +static int __init icache_way2_val(char *str)
 172 +{
 173 +       get_option(&str, &icache_way2);
 174 +       return 1;
 175 +}
 176 +__setup("icache_way2=", icache_way2_val);
 177 +
 178 +int icache_way3 = 0;
 179 +static int __init icache_way3_val(char *str)
 180 +{
 181 +       get_option(&str, &icache_way3);
 182 +       return 1;
 183 +}
 184 +__setup("icache_way3=", icache_way3_val);
 185 +
 186 +int dcache_way0 = 0;
 187 +static int __init dcache_way0_val(char *str)
 188 +{
 189 +       get_option(&str, &dcache_way0);
 190 +       return 1;
 191 +}
 192 +__setup("dcache_way0=", dcache_way0_val);
 193 +
 194 +int dcache_way1 = 0;
 195 +static int __init dcache_way1_val(char *str)
 196 +{
 197 +       get_option(&str, &dcache_way1);
 198 +       return 1;
 199 +}
 200 +__setup("dcache_way1=", dcache_way1_val);
 201 +
 202 +int dcache_way2 = 0;
 203 +static int __init dcache_way2_val(char *str)
 204 +{
 205 +       get_option(&str, &dcache_way2);
 206 +       return 1;
 207 +}
 208 +__setup("dcache_way2=", dcache_way2_val);
 209 +
 210 +int dcache_way3 = 0;
 211 +static int __init dcache_way3_val(char *str)
 212 +{
 213 +       get_option(&str, &dcache_way3);
 214 +       return 1;
 215 +}
 216 +__setup("dcache_way3=", dcache_way3_val);
 217 +
 218 +#endif /* endif CONFIG_IFX_VPE_CACHE_SPLIT */
 219 +
 220  void __cpuinit r4k_cache_init(void)
 221  {
 222         extern void build_clear_page(void);
 223 @@ -1366,6 +1466,78 @@
 224                 break;
 225         }
 226
 227 +#ifdef CONFIG_IFX_VPE_CACHE_SPLIT
 228 +       /*
 229 +        * We split the cache ways appropriately among the VPEs
 230 +        * based on cache ways values we received as command line
 231 +        * arguments
 232 +        */
 233 +       if ( (!vpe_icache_shared) || (!vpe_dcache_shared) ){
 234 +
 235 +               /* PCP bit must be 1 to split the cache */
 236 +               if(read_c0_mvpconf0() & MVPCONF0_PCP) {
 237 +
 238 +                       /* Set CPA bit which enables us to modify VPEOpt register */
 239 +                       write_c0_mvpcontrol((read_c0_mvpcontrol()) | MVPCONTROL_CPA);
 240 +
 241 +                       if ( !vpe_icache_shared ){
 242 +                               write_c0_vpeconf0((read_c0_vpeconf0()) & ~VPECONF0_ICS);
 243 +                               /*
 244 +                                * If any cache way is 1, then that way is denied
 245 +                                * in VPE0. Otherwise assign that way to VPE0.
 246 +                                */
 247 +                               printk(KERN_DEBUG "icache is split\n");
 248 +                               printk(KERN_DEBUG "icache_way0=%d icache_way1=%d icache_way2=%d icache_way3=%d\n",
 249 +                                       icache_way0, icache_way1,icache_way2, icache_way3);
 250 +                               if (icache_way0)
 251 +                                       write_c0_vpeopt(read_c0_vpeopt() | VPEOPT_IWX0 );
 252 +                               else
 253 +                                       write_c0_vpeopt(read_c0_vpeopt() & ~VPEOPT_IWX0 );
 254 +                               if (icache_way1)
 255 +                                       write_c0_vpeopt(read_c0_vpeopt() | VPEOPT_IWX1 );
 256 +                               else
 257 +                                       write_c0_vpeopt(read_c0_vpeopt() & ~VPEOPT_IWX1 );
 258 +                               if (icache_way2)
 259 +                                       write_c0_vpeopt(read_c0_vpeopt() | VPEOPT_IWX2 );
 260 +                               else
 261 +                                       write_c0_vpeopt(read_c0_vpeopt() & ~VPEOPT_IWX2 );
 262 +                               if (icache_way3)
 263 +                                       write_c0_vpeopt(read_c0_vpeopt() | VPEOPT_IWX3 );
 264 +                               else
 265 +                                       write_c0_vpeopt(read_c0_vpeopt() & ~VPEOPT_IWX3 );
 266 +                       }
 267 +
 268 +                       if ( !vpe_dcache_shared ) {
 269 +                               /*
 270 +                                * If any cache way is 1, then that way is denied
 271 +                                * in VPE0. Otherwise assign that way to VPE0.
 272 +                                */
 273 +                               printk(KERN_DEBUG "dcache is split\n");
 274 +                               printk(KERN_DEBUG "dcache_way0=%d dcache_way1=%d dcache_way2=%d dcache_way3=%d\n",
 275 +                                       dcache_way0, dcache_way1, dcache_way2, dcache_way3);
 276 +                               write_c0_vpeconf0((read_c0_vpeconf0()) & ~VPECONF0_DCS);
 277 +                               if (dcache_way0)
 278 +                                       write_c0_vpeopt(read_c0_vpeopt() | VPEOPT_DWX0 );
 279 +                               else
 280 +                                       write_c0_vpeopt(read_c0_vpeopt() & ~VPEOPT_DWX0 );
 281 +                               if (dcache_way1)
 282 +                                       write_c0_vpeopt(read_c0_vpeopt() | VPEOPT_DWX1 );
 283 +                               else
 284 +                                       write_c0_vpeopt(read_c0_vpeopt() & ~VPEOPT_DWX1 );
 285 +                               if (dcache_way2)
 286 +                                       write_c0_vpeopt(read_c0_vpeopt() | VPEOPT_DWX2 );
 287 +                               else
 288 +                                       write_c0_vpeopt(read_c0_vpeopt() & ~VPEOPT_DWX2 );
 289 +                               if (dcache_way3)
 290 +                                       write_c0_vpeopt(read_c0_vpeopt() | VPEOPT_DWX3 );
 291 +                               else
 292 +                                       write_c0_vpeopt(read_c0_vpeopt() & ~VPEOPT_DWX3 );
 293 +                       }
 294 +               }
 295 +       }
 296 +
 297 +#endif /* endif CONFIG_IFX_VPE_CACHE_SPLIT */
 298 +
 299         probe_pcache();
 300         setup_scache();
 301