target/linux/lantiq/patches-3.2/0060-MIPS-lantiq-cache-split.patch

   1 From 307ba9e4d8fb0608566aacf88ab8cded5e20e005 Mon Sep 17 00:00:00 2001
   2 From: John Crispin <blogic@openwrt.org>
   3 Date: Thu, 29 Sep 2011 20:31:54 +0200
   4 Subject: [PATCH 60/70] MIPS: lantiq: cache split
   5
   6 ---
   7  arch/mips/Kconfig      |   22 ++++++
   8  arch/mips/kernel/vpe.c |   66 ++++++++++++++++++
   9  arch/mips/mm/c-r4k.c   |  172 ++++++++++++++++++++++++++++++++++++++++++++++++
  10  3 files changed, 260 insertions(+), 0 deletions(-)
  11
  12 --- a/arch/mips/Kconfig
  13 +++ b/arch/mips/Kconfig
  14 @@ -1916,6 +1916,28 @@ config IFX_VPE_EXT
  15         help
  16           IFX included extensions in APRP
  17
  18 +config IFX_VPE_CACHE_SPLIT
  19 +       bool "IFX Cache Split Ways"
  20 +       depends on IFX_VPE_EXT
  21 +       help
  22 +         IFX extension for reserving (splitting) cache ways among VPEs. You must
  23 +         give kernel command line arguments vpe_icache_shared=0 or
  24 +         vpe_dcache_shared=0 to enable splitting of icache or dcache
  25 +         respectively. Then you can specify which cache ways should be
  26 +         assigned to which VPE. There are total 8 cache ways, 4 each
  27 +         for dcache and icache: dcache_way0, dcache_way1,dcache_way2,
  28 +         dcache_way3 and icache_way0,icache_way1, icache_way2,icache_way3.
  29 +
  30 +         For example, if you specify vpe_icache_shared=0 and icache_way2=1,
  31 +         then the 3rd icache way will be assigned to VPE0 and denied in VPE1.
  32 +
  33 +         For icache, software is required to make at least one cache way available
  34 +         for a VPE at all times i.e., one can't assign all the icache ways to one
  35 +         VPE.
  36 +
  37 +         By default, vpe_dcache_shared and vpe_icache_shared are set to 1
  38 +         (i.e., both icache and dcache are shared among VPEs)
  39 +
  40  config PERFCTRS
  41         bool "34K Performance counters"
  42         depends on MIPS_MT && PROC_FS
  43 --- a/arch/mips/kernel/vpe.c
  44 +++ b/arch/mips/kernel/vpe.c
  45 @@ -127,6 +127,13 @@ __setup("vpe1_wdog_timeout=", wdog_timeo
  46  EXPORT_SYMBOL(vpe1_wdog_timeout);
  47
  48  #endif
  49 +
  50 +#ifdef CONFIG_IFX_VPE_CACHE_SPLIT /* Code for splitting the cache ways among VPEs. */
  51 +extern int vpe_icache_shared,vpe_dcache_shared;
  52 +extern int icache_way0,icache_way1,icache_way2,icache_way3;
  53 +extern int dcache_way0,dcache_way1,dcache_way2,dcache_way3;
  54 +#endif
  55 +
  56  /* grab the likely amount of memory we will need. */
  57  #ifdef CONFIG_MIPS_VPE_LOADER_TOM
  58  #define P_SIZE (2 * 1024 * 1024)
  59 @@ -865,6 +872,65 @@ static int vpe_run(struct vpe * v)
  60         /* enable this VPE */
  61         write_vpe_c0_vpeconf0(read_vpe_c0_vpeconf0() | VPECONF0_VPA);
  62
  63 +#ifdef CONFIG_IFX_VPE_CACHE_SPLIT
  64 +       if ( (!vpe_icache_shared) || (!vpe_dcache_shared) ) {
  65 +
  66 +               /* PCP bit must be 1 to split the cache */
  67 +               if(read_c0_mvpconf0() & MVPCONF0_PCP) {
  68 +
  69 +                       if ( !vpe_icache_shared ){
  70 +                               write_vpe_c0_vpeconf0((read_vpe_c0_vpeconf0()) & ~VPECONF0_ICS);
  71 +
  72 +                               /*
  73 +                                * If any cache way is 1, then that way is denied
  74 +                                * in VPE1. Otherwise assign that way to VPE1.
  75 +                                */
  76 +                               if (!icache_way0)
  77 +                                       write_vpe_c0_vpeopt(read_vpe_c0_vpeopt() | VPEOPT_IWX0 );
  78 +                               else
  79 +                                       write_vpe_c0_vpeopt(read_vpe_c0_vpeopt() & ~VPEOPT_IWX0 );
  80 +                               if (!icache_way1)
  81 +                                       write_vpe_c0_vpeopt(read_vpe_c0_vpeopt() | VPEOPT_IWX1 );
  82 +                               else
  83 +                                       write_vpe_c0_vpeopt(read_vpe_c0_vpeopt() & ~VPEOPT_IWX1 );
  84 +                               if (!icache_way2)
  85 +                                       write_vpe_c0_vpeopt(read_vpe_c0_vpeopt() | VPEOPT_IWX2 );
  86 +                               else
  87 +                                       write_vpe_c0_vpeopt(read_vpe_c0_vpeopt() & ~VPEOPT_IWX2 );
  88 +                               if (!icache_way3)
  89 +                                       write_vpe_c0_vpeopt(read_vpe_c0_vpeopt() | VPEOPT_IWX3 );
  90 +                               else
  91 +                                       write_vpe_c0_vpeopt(read_vpe_c0_vpeopt() & ~VPEOPT_IWX3 );
  92 +                       }
  93 +
  94 +                       if ( !vpe_dcache_shared ) {
  95 +                               write_vpe_c0_vpeconf0((read_vpe_c0_vpeconf0()) & ~VPECONF0_DCS);
  96 +
  97 +                               /*
  98 +                                * If any cache way is 1, then that way is denied
  99 +                                * in VPE1. Otherwise assign that way to VPE1.
 100 +                                */
 101 +                               if (!dcache_way0)
 102 +                                       write_vpe_c0_vpeopt(read_vpe_c0_vpeopt() | VPEOPT_DWX0 );
 103 +                               else
 104 +                                       write_vpe_c0_vpeopt(read_vpe_c0_vpeopt() & ~VPEOPT_DWX0 );
 105 +                               if (!dcache_way1)
 106 +                                       write_vpe_c0_vpeopt(read_vpe_c0_vpeopt() | VPEOPT_DWX1 );
 107 +                               else
 108 +                                       write_vpe_c0_vpeopt(read_vpe_c0_vpeopt() & ~VPEOPT_DWX1 );
 109 +                               if (!dcache_way2)
 110 +                                       write_vpe_c0_vpeopt(read_vpe_c0_vpeopt() | VPEOPT_DWX2 );
 111 +                               else
 112 +                                       write_vpe_c0_vpeopt(read_vpe_c0_vpeopt() & ~VPEOPT_DWX2 );
 113 +                               if (!dcache_way3)
 114 +                                       write_vpe_c0_vpeopt(read_vpe_c0_vpeopt() | VPEOPT_DWX3 );
 115 +                               else
 116 +                                       write_vpe_c0_vpeopt(read_vpe_c0_vpeopt() & ~VPEOPT_DWX3 );
 117 +                       }
 118 +               }
 119 +       }
 120 +#endif /* endif CONFIG_IFX_VPE_CACHE_SPLIT */
 121 +
 122         /* clear out any left overs from a previous program */
 123         write_vpe_c0_status(0);
 124         write_vpe_c0_cause(0);
 125 --- a/arch/mips/mm/c-r4k.c
 126 +++ b/arch/mips/mm/c-r4k.c
 127 @@ -1383,6 +1383,106 @@ static int __init setcoherentio(char *st
 128  __setup("coherentio", setcoherentio);
 129  #endif
 130
 131 +#ifdef CONFIG_IFX_VPE_CACHE_SPLIT /* Code for splitting the cache ways among VPEs. */
 132 +
 133 +#include <asm/mipsmtregs.h>
 134 +
 135 +/*
 136 + * By default, vpe_icache_shared and vpe_dcache_shared
 137 + * values are 1 i.e., both icache and dcache are shared
 138 + * among the VPEs.
 139 + */
 140 +
 141 +int vpe_icache_shared = 1;
 142 +static int __init vpe_icache_shared_val(char *str)
 143 +{
 144 +       get_option(&str, &vpe_icache_shared);
 145 +       return 1;
 146 +}
 147 +__setup("vpe_icache_shared=", vpe_icache_shared_val);
 148 +EXPORT_SYMBOL(vpe_icache_shared);
 149 +
 150 +int vpe_dcache_shared = 1;
 151 +static int __init vpe_dcache_shared_val(char *str)
 152 +{
 153 +       get_option(&str, &vpe_dcache_shared);
 154 +       return 1;
 155 +}
 156 +__setup("vpe_dcache_shared=", vpe_dcache_shared_val);
 157 +EXPORT_SYMBOL(vpe_dcache_shared);
 158 +
 159 +/*
 160 + * Software is required to make atleast one icache
 161 + * way available for a VPE at all times i.e., one
 162 + * can't assign all the icache ways to one VPE.
 163 + */
 164 +
 165 +int icache_way0 = 0;
 166 +static int __init icache_way0_val(char *str)
 167 +{
 168 +       get_option(&str, &icache_way0);
 169 +       return 1;
 170 +}
 171 +__setup("icache_way0=", icache_way0_val);
 172 +
 173 +int icache_way1 = 0;
 174 +static int __init icache_way1_val(char *str)
 175 +{
 176 +       get_option(&str, &icache_way1);
 177 +       return 1;
 178 +}
 179 +__setup("icache_way1=", icache_way1_val);
 180 +
 181 +int icache_way2 = 0;
 182 +static int __init icache_way2_val(char *str)
 183 +{
 184 +       get_option(&str, &icache_way2);
 185 +       return 1;
 186 +}
 187 +__setup("icache_way2=", icache_way2_val);
 188 +
 189 +int icache_way3 = 0;
 190 +static int __init icache_way3_val(char *str)
 191 +{
 192 +       get_option(&str, &icache_way3);
 193 +       return 1;
 194 +}
 195 +__setup("icache_way3=", icache_way3_val);
 196 +
 197 +int dcache_way0 = 0;
 198 +static int __init dcache_way0_val(char *str)
 199 +{
 200 +       get_option(&str, &dcache_way0);
 201 +       return 1;
 202 +}
 203 +__setup("dcache_way0=", dcache_way0_val);
 204 +
 205 +int dcache_way1 = 0;
 206 +static int __init dcache_way1_val(char *str)
 207 +{
 208 +       get_option(&str, &dcache_way1);
 209 +       return 1;
 210 +}
 211 +__setup("dcache_way1=", dcache_way1_val);
 212 +
 213 +int dcache_way2 = 0;
 214 +static int __init dcache_way2_val(char *str)
 215 +{
 216 +       get_option(&str, &dcache_way2);
 217 +       return 1;
 218 +}
 219 +__setup("dcache_way2=", dcache_way2_val);
 220 +
 221 +int dcache_way3 = 0;
 222 +static int __init dcache_way3_val(char *str)
 223 +{
 224 +       get_option(&str, &dcache_way3);
 225 +       return 1;
 226 +}
 227 +__setup("dcache_way3=", dcache_way3_val);
 228 +
 229 +#endif /* endif CONFIG_IFX_VPE_CACHE_SPLIT */
 230 +
 231  void __cpuinit r4k_cache_init(void)
 232  {
 233         extern void build_clear_page(void);
 234 @@ -1402,6 +1502,78 @@ void __cpuinit r4k_cache_init(void)
 235                 break;
 236         }
 237
 238 +#ifdef CONFIG_IFX_VPE_CACHE_SPLIT
 239 +       /*
 240 +        * We split the cache ways appropriately among the VPEs
 241 +        * based on cache ways values we received as command line
 242 +        * arguments
 243 +        */
 244 +       if ( (!vpe_icache_shared) || (!vpe_dcache_shared) ){
 245 +
 246 +               /* PCP bit must be 1 to split the cache */
 247 +               if(read_c0_mvpconf0() & MVPCONF0_PCP) {
 248 +
 249 +                       /* Set CPA bit which enables us to modify VPEOpt register */
 250 +                       write_c0_mvpcontrol((read_c0_mvpcontrol()) | MVPCONTROL_CPA);
 251 +
 252 +                       if ( !vpe_icache_shared ){
 253 +                               write_c0_vpeconf0((read_c0_vpeconf0()) & ~VPECONF0_ICS);
 254 +                               /*
 255 +                                * If any cache way is 1, then that way is denied
 256 +                                * in VPE0. Otherwise assign that way to VPE0.
 257 +                                */
 258 +                               printk(KERN_DEBUG "icache is split\n");
 259 +                               printk(KERN_DEBUG "icache_way0=%d icache_way1=%d icache_way2=%d icache_way3=%d\n",
 260 +                                       icache_way0, icache_way1,icache_way2, icache_way3);
 261 +                               if (icache_way0)
 262 +                                       write_c0_vpeopt(read_c0_vpeopt() | VPEOPT_IWX0 );
 263 +                               else
 264 +                                       write_c0_vpeopt(read_c0_vpeopt() & ~VPEOPT_IWX0 );
 265 +                               if (icache_way1)
 266 +                                       write_c0_vpeopt(read_c0_vpeopt() | VPEOPT_IWX1 );
 267 +                               else
 268 +                                       write_c0_vpeopt(read_c0_vpeopt() & ~VPEOPT_IWX1 );
 269 +                               if (icache_way2)
 270 +                                       write_c0_vpeopt(read_c0_vpeopt() | VPEOPT_IWX2 );
 271 +                               else
 272 +                                       write_c0_vpeopt(read_c0_vpeopt() & ~VPEOPT_IWX2 );
 273 +                               if (icache_way3)
 274 +                                       write_c0_vpeopt(read_c0_vpeopt() | VPEOPT_IWX3 );
 275 +                               else
 276 +                                       write_c0_vpeopt(read_c0_vpeopt() & ~VPEOPT_IWX3 );
 277 +                       }
 278 +
 279 +                       if ( !vpe_dcache_shared ) {
 280 +                               /*
 281 +                                * If any cache way is 1, then that way is denied
 282 +                                * in VPE0. Otherwise assign that way to VPE0.
 283 +                                */
 284 +                               printk(KERN_DEBUG "dcache is split\n");
 285 +                               printk(KERN_DEBUG "dcache_way0=%d dcache_way1=%d dcache_way2=%d dcache_way3=%d\n",
 286 +                                       dcache_way0, dcache_way1, dcache_way2, dcache_way3);
 287 +                               write_c0_vpeconf0((read_c0_vpeconf0()) & ~VPECONF0_DCS);
 288 +                               if (dcache_way0)
 289 +                                       write_c0_vpeopt(read_c0_vpeopt() | VPEOPT_DWX0 );
 290 +                               else
 291 +                                       write_c0_vpeopt(read_c0_vpeopt() & ~VPEOPT_DWX0 );
 292 +                               if (dcache_way1)
 293 +                                       write_c0_vpeopt(read_c0_vpeopt() | VPEOPT_DWX1 );
 294 +                               else
 295 +                                       write_c0_vpeopt(read_c0_vpeopt() & ~VPEOPT_DWX1 );
 296 +                               if (dcache_way2)
 297 +                                       write_c0_vpeopt(read_c0_vpeopt() | VPEOPT_DWX2 );
 298 +                               else
 299 +                                       write_c0_vpeopt(read_c0_vpeopt() & ~VPEOPT_DWX2 );
 300 +                               if (dcache_way3)
 301 +                                       write_c0_vpeopt(read_c0_vpeopt() | VPEOPT_DWX3 );
 302 +                               else
 303 +                                       write_c0_vpeopt(read_c0_vpeopt() & ~VPEOPT_DWX3 );
 304 +                       }
 305 +               }
 306 +       }
 307 +
 308 +#endif /* endif CONFIG_IFX_VPE_CACHE_SPLIT */
 309 +
 310         probe_pcache();
 311         setup_scache();
 312