arch/ppc/kernel/ppc_htab.c

   1 /*
   2  * PowerPC hash table management proc entry.  Will show information
   3  * about the current hash table and will allow changes to it.
   4  *
   5  * Written by Cort Dougan (cort@cs.nmt.edu)
   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
  13 #include <linux/errno.h>
  14 #include <linux/sched.h>
  15 #include <linux/proc_fs.h>
  16 #include <linux/stat.h>
  17 #include <linux/sysctl.h>
  18 #include <linux/capability.h>
  19 #include <linux/ctype.h>
  20 #include <linux/threads.h>
  21 #include <linux/smp_lock.h>
  22 #include <linux/seq_file.h>
  23 #include <linux/init.h>
  24 #include <linux/bitops.h>
  25
  26 #include <asm/uaccess.h>
  27 #include <asm/mmu.h>
  28 #include <asm/residual.h>
  29 #include <asm/io.h>
  30 #include <asm/pgtable.h>
  31 #include <asm/cputable.h>
  32 #include <asm/system.h>
  33 #include <asm/reg.h>
  34
  35 static int ppc_htab_show(struct seq_file *m, void *v);
  36 static ssize_t ppc_htab_write(struct file * file, const char __user * buffer,
  37                               size_t count, loff_t *ppos);
  38 extern PTE *Hash, *Hash_end;
  39 extern unsigned long Hash_size, Hash_mask;
  40 extern unsigned long _SDR1;
  41 extern unsigned long htab_reloads;
  42 extern unsigned long htab_preloads;
  43 extern unsigned long htab_evicts;
  44 extern unsigned long pte_misses;
  45 extern unsigned long pte_errors;
  46 extern unsigned int primary_pteg_full;
  47 extern unsigned int htab_hash_searches;
  48
  49 static int ppc_htab_open(struct inode *inode, struct file *file)
  50 {
  51         return single_open(file, ppc_htab_show, NULL);
  52 }
  53
  54 const struct file_operations ppc_htab_operations = {
  55         .open           = ppc_htab_open,
  56         .read           = seq_read,
  57         .llseek         = seq_lseek,
  58         .write          = ppc_htab_write,
  59         .release        = single_release,
  60 };
  61
  62 static char *pmc1_lookup(unsigned long mmcr0)
  63 {
  64         switch ( mmcr0 & (0x7f<<7) )
  65         {
  66         case 0x0:
  67                 return "none";
  68         case MMCR0_PMC1_CYCLES:
  69                 return "cycles";
  70         case MMCR0_PMC1_ICACHEMISS:
  71                 return "ic miss";
  72         case MMCR0_PMC1_DTLB:
  73                 return "dtlb miss";
  74         default:
  75                 return "unknown";
  76         }
  77 }
  78
  79 static char *pmc2_lookup(unsigned long mmcr0)
  80 {
  81         switch ( mmcr0 & 0x3f )
  82         {
  83         case 0x0:
  84                 return "none";
  85         case MMCR0_PMC2_CYCLES:
  86                 return "cycles";
  87         case MMCR0_PMC2_DCACHEMISS:
  88                 return "dc miss";
  89         case MMCR0_PMC2_ITLB:
  90                 return "itlb miss";
  91         case MMCR0_PMC2_LOADMISSTIME:
  92                 return "load miss time";
  93         default:
  94                 return "unknown";
  95         }
  96 }
  97
  98 /*
  99  * print some useful info about the hash table.  This function
 100  * is _REALLY_ slow (see the nested for loops below) but nothing
 101  * in here should be really timing critical. -- Cort
 102  */
 103 static int ppc_htab_show(struct seq_file *m, void *v)
 104 {
 105         unsigned long mmcr0 = 0, pmc1 = 0, pmc2 = 0;
 106 #if defined(CONFIG_PPC_STD_MMU)
 107         unsigned int kptes = 0, uptes = 0;
 108         PTE *ptr;
 109 #endif /* CONFIG_PPC_STD_MMU */
 110
 111         if (cpu_has_feature(CPU_FTR_604_PERF_MON)) {
 112                 mmcr0 = mfspr(SPRN_MMCR0);
 113                 pmc1 = mfspr(SPRN_PMC1);
 114                 pmc2 = mfspr(SPRN_PMC2);
 115                 seq_printf(m,
 116                               "604 Performance Monitoring\n"
 117                               "MMCR0\t\t: %08lx %s%s ",
 118                               mmcr0,
 119                               ( mmcr0>>28 & 0x2 ) ? "(user mode counted)" : "",
 120                               ( mmcr0>>28 & 0x4 ) ? "(kernel mode counted)" : "");
 121                 seq_printf(m,
 122                               "\nPMC1\t\t: %08lx (%s)\n"
 123                               "PMC2\t\t: %08lx (%s)\n",
 124                               pmc1, pmc1_lookup(mmcr0),
 125                               pmc2, pmc2_lookup(mmcr0));
 126         }
 127
 128 #ifdef CONFIG_PPC_STD_MMU
 129         /* if we don't have a htab */
 130         if ( Hash_size == 0 ) {
 131                 seq_printf(m, "No Hash Table used\n");
 132                 return 0;
 133         }
 134
 135         for (ptr = Hash; ptr < Hash_end; ptr++) {
 136                 unsigned int mctx, vsid;
 137
 138                 if (!ptr->v)
 139                         continue;
 140                 /* undo the esid skew */
 141                 vsid = ptr->vsid;
 142                 mctx = ((vsid - (vsid & 0xf) * 0x111) >> 4) & 0xfffff;
 143                 if (mctx == 0)
 144                         kptes++;
 145                 else
 146                         uptes++;
 147         }
 148
 149         seq_printf(m,
 150                       "PTE Hash Table Information\n"
 151                       "Size\t\t: %luKb\n"
 152                       "Buckets\t\t: %lu\n"
 153                       "Address\t\t: %08lx\n"
 154                       "Entries\t\t: %lu\n"
 155                       "User ptes\t: %u\n"
 156                       "Kernel ptes\t: %u\n"
 157                       "Percent full\t: %lu%%\n"
 158                       , (unsigned long)(Hash_size>>10),
 159                       (Hash_size/(sizeof(PTE)*8)),
 160                       (unsigned long)Hash,
 161                       Hash_size/sizeof(PTE)
 162                       , uptes,
 163                       kptes,
 164                       ((kptes+uptes)*100) / (Hash_size/sizeof(PTE))
 165                 );
 166
 167         seq_printf(m,
 168                       "Reloads\t\t: %lu\n"
 169                       "Preloads\t: %lu\n"
 170                       "Searches\t: %u\n"
 171                       "Overflows\t: %u\n"
 172                       "Evicts\t\t: %lu\n",
 173                       htab_reloads, htab_preloads, htab_hash_searches,
 174                       primary_pteg_full, htab_evicts);
 175 #endif /* CONFIG_PPC_STD_MMU */
 176
 177         seq_printf(m,
 178                       "Non-error misses: %lu\n"
 179                       "Error misses\t: %lu\n",
 180                       pte_misses, pte_errors);
 181         return 0;
 182 }
 183
 184 /*
 185  * Allow user to define performance counters and resize the hash table
 186  */
 187 static ssize_t ppc_htab_write(struct file * file, const char __user * ubuffer,
 188                               size_t count, loff_t *ppos)
 189 {
 190 #ifdef CONFIG_PPC_STD_MMU
 191         unsigned long tmp;
 192         char buffer[16];
 193
 194         if (!capable(CAP_SYS_ADMIN))
 195                 return -EACCES;
 196         if (strncpy_from_user(buffer, ubuffer, 15))
 197                 return -EFAULT;
 198         buffer[15] = 0;
 199
 200         /* don't set the htab size for now */
 201         if ( !strncmp( buffer, "size ", 5) )
 202                 return -EBUSY;
 203
 204         if ( !strncmp( buffer, "reset", 5) )
 205         {
 206                 if (cpu_has_feature(CPU_FTR_604_PERF_MON)) {
 207                         /* reset PMC1 and PMC2 */
 208                         mtspr(SPRN_PMC1, 0);
 209                         mtspr(SPRN_PMC2, 0);
 210                 }
 211                 htab_reloads = 0;
 212                 htab_evicts = 0;
 213                 pte_misses = 0;
 214                 pte_errors = 0;
 215         }
 216
 217         /* Everything below here requires the performance monitor feature. */
 218         if (!cpu_has_feature(CPU_FTR_604_PERF_MON))
 219                 return count;
 220
 221         /* turn off performance monitoring */
 222         if ( !strncmp( buffer, "off", 3) )
 223         {
 224                 mtspr(SPRN_MMCR0, 0);
 225                 mtspr(SPRN_PMC1, 0);
 226                 mtspr(SPRN_PMC2, 0);
 227         }
 228
 229         if ( !strncmp( buffer, "user", 4) )
 230         {
 231                 /* setup mmcr0 and clear the correct pmc */
 232                 tmp = (mfspr(SPRN_MMCR0) & ~(0x60000000)) | 0x20000000;
 233                 mtspr(SPRN_MMCR0, tmp);
 234                 mtspr(SPRN_PMC1, 0);
 235                 mtspr(SPRN_PMC2, 0);
 236         }
 237
 238         if ( !strncmp( buffer, "kernel", 6) )
 239         {
 240                 /* setup mmcr0 and clear the correct pmc */
 241                 tmp = (mfspr(SPRN_MMCR0) & ~(0x60000000)) | 0x40000000;
 242                 mtspr(SPRN_MMCR0, tmp);
 243                 mtspr(SPRN_PMC1, 0);
 244                 mtspr(SPRN_PMC2, 0);
 245         }
 246
 247         /* PMC1 values */
 248         if ( !strncmp( buffer, "dtlb", 4) )
 249         {
 250                 /* setup mmcr0 and clear the correct pmc */
 251                 tmp = (mfspr(SPRN_MMCR0) & ~(0x7F << 7)) | MMCR0_PMC1_DTLB;
 252                 mtspr(SPRN_MMCR0, tmp);
 253                 mtspr(SPRN_PMC1, 0);
 254         }
 255
 256         if ( !strncmp( buffer, "ic miss", 7) )
 257         {
 258                 /* setup mmcr0 and clear the correct pmc */
 259                 tmp = (mfspr(SPRN_MMCR0) & ~(0x7F<<7)) | MMCR0_PMC1_ICACHEMISS;
 260                 mtspr(SPRN_MMCR0, tmp);
 261                 mtspr(SPRN_PMC1, 0);
 262         }
 263
 264         /* PMC2 values */
 265         if ( !strncmp( buffer, "load miss time", 14) )
 266         {
 267                 /* setup mmcr0 and clear the correct pmc */
 268                asm volatile(
 269                        "mfspr %0,%1\n\t"     /* get current mccr0 */
 270                        "rlwinm %0,%0,0,0,31-6\n\t"  /* clear bits [26-31] */
 271                        "ori   %0,%0,%2 \n\t" /* or in mmcr0 settings */
 272                        "mtspr %1,%0 \n\t"    /* set new mccr0 */
 273                        "mtspr %3,%4 \n\t"    /* reset the pmc */
 274                        : "=r" (tmp)
 275                        : "i" (SPRN_MMCR0),
 276                        "i" (MMCR0_PMC2_LOADMISSTIME),
 277                        "i" (SPRN_PMC2),  "r" (0) );
 278         }
 279
 280         if ( !strncmp( buffer, "itlb", 4) )
 281         {
 282                 /* setup mmcr0 and clear the correct pmc */
 283                asm volatile(
 284                        "mfspr %0,%1\n\t"     /* get current mccr0 */
 285                        "rlwinm %0,%0,0,0,31-6\n\t"  /* clear bits [26-31] */
 286                        "ori   %0,%0,%2 \n\t" /* or in mmcr0 settings */
 287                        "mtspr %1,%0 \n\t"    /* set new mccr0 */
 288                        "mtspr %3,%4 \n\t"    /* reset the pmc */
 289                        : "=r" (tmp)
 290                        : "i" (SPRN_MMCR0), "i" (MMCR0_PMC2_ITLB),
 291                        "i" (SPRN_PMC2),  "r" (0) );
 292         }
 293
 294         if ( !strncmp( buffer, "dc miss", 7) )
 295         {
 296                 /* setup mmcr0 and clear the correct pmc */
 297                asm volatile(
 298                        "mfspr %0,%1\n\t"     /* get current mccr0 */
 299                        "rlwinm %0,%0,0,0,31-6\n\t"  /* clear bits [26-31] */
 300                        "ori   %0,%0,%2 \n\t" /* or in mmcr0 settings */
 301                        "mtspr %1,%0 \n\t"    /* set new mccr0 */
 302                        "mtspr %3,%4 \n\t"    /* reset the pmc */
 303                        : "=r" (tmp)
 304                        : "i" (SPRN_MMCR0), "i" (MMCR0_PMC2_DCACHEMISS),
 305                        "i" (SPRN_PMC2),  "r" (0) );
 306         }
 307
 308         return count;
 309 #else /* CONFIG_PPC_STD_MMU */
 310         return 0;
 311 #endif /* CONFIG_PPC_STD_MMU */
 312 }
 313
 314 int proc_dol2crvec(ctl_table *table, int write, struct file *filp,
 315                   void __user *buffer_arg, size_t *lenp, loff_t *ppos)
 316 {
 317         int vleft, first=1, len, left, val;
 318         char __user *buffer = (char __user *) buffer_arg;
 319         #define TMPBUFLEN 256
 320         char buf[TMPBUFLEN], *p;
 321         static const char *sizestrings[4] = {
 322                 "2MB", "256KB", "512KB", "1MB"
 323         };
 324         static const char *clockstrings[8] = {
 325                 "clock disabled", "+1 clock", "+1.5 clock", "reserved(3)",
 326                 "+2 clock", "+2.5 clock", "+3 clock", "reserved(7)"
 327         };
 328         static const char *typestrings[4] = {
 329                 "flow-through burst SRAM", "reserved SRAM",
 330                 "pipelined burst SRAM", "pipelined late-write SRAM"
 331         };
 332         static const char *holdstrings[4] = {
 333                 "0.5", "1.0", "(reserved2)", "(reserved3)"
 334         };
 335
 336         if (!cpu_has_feature(CPU_FTR_L2CR))
 337                 return -EFAULT;
 338
 339         if ( /*!table->maxlen ||*/ (*ppos && !write)) {
 340                 *lenp = 0;
 341                 return 0;
 342         }
 343
 344         vleft = table->maxlen / sizeof(int);
 345         left = *lenp;
 346
 347         for (; left /*&& vleft--*/; first=0) {
 348                 if (write) {
 349                         while (left) {
 350                                 char c;
 351                                 if(get_user(c, buffer))
 352                                         return -EFAULT;
 353                                 if (!isspace(c))
 354                                         break;
 355                                 left--;
 356                                 buffer++;
 357                         }
 358                         if (!left)
 359                                 break;
 360                         len = left;
 361                         if (len > TMPBUFLEN-1)
 362                                 len = TMPBUFLEN-1;
 363                         if(copy_from_user(buf, buffer, len))
 364                                 return -EFAULT;
 365                         buf[len] = 0;
 366                         p = buf;
 367                         if (*p < '0' || *p > '9')
 368                                 break;
 369                         val = simple_strtoul(p, &p, 0);
 370                         len = p-buf;
 371                         if ((len < left) && *p && !isspace(*p))
 372                                 break;
 373                         buffer += len;
 374                         left -= len;
 375                         _set_L2CR(val);
 376                 } else {
 377                         p = buf;
 378                         if (!first)
 379                                 *p++ = '\t';
 380                         val = _get_L2CR();
 381                         p += sprintf(p, "0x%08x: ", val);
 382                         p += sprintf(p, " %s", (val >> 31) & 1 ? "enabled" :
 383                                         "disabled");
 384                         p += sprintf(p, ", %sparity", (val>>30)&1 ? "" : "no ");
 385                         p += sprintf(p, ", %s", sizestrings[(val >> 28) & 3]);
 386                         p += sprintf(p, ", %s", clockstrings[(val >> 25) & 7]);
 387                         p += sprintf(p, ", %s", typestrings[(val >> 23) & 2]);
 388                         p += sprintf(p, "%s", (val>>22)&1 ? ", data only" : "");
 389                         p += sprintf(p, "%s", (val>>20)&1 ? ", ZZ enabled": "");
 390                         p += sprintf(p, ", %s", (val>>19)&1 ? "write-through" :
 391                                         "copy-back");
 392                         p += sprintf(p, "%s", (val>>18)&1 ? ", testing" : "");
 393                         p += sprintf(p, ", %sns hold",holdstrings[(val>>16)&3]);
 394                         p += sprintf(p, "%s", (val>>15)&1 ? ", DLL slow" : "");
 395                         p += sprintf(p, "%s", (val>>14)&1 ? ", diff clock" :"");
 396                         p += sprintf(p, "%s", (val>>13)&1 ? ", DLL bypass" :"");
 397
 398                         p += sprintf(p,"\n");
 399
 400                         len = strlen(buf);
 401                         if (len > left)
 402                                 len = left;
 403                         if (copy_to_user(buffer, buf, len))
 404                                 return -EFAULT;
 405                         left -= len;
 406                         buffer += len;
 407                         break;
 408                 }
 409         }
 410
 411         if (!write && !first && left) {
 412                 if(put_user('\n', (char __user *) buffer))
 413                         return -EFAULT;
 414                 left--, buffer++;
 415         }
 416         if (write) {
 417                 char __user *s = (char __user *) buffer;
 418                 while (left) {
 419                         char c;
 420                         if(get_user(c, s++))
 421                                 return -EFAULT;
 422                         if (!isspace(c))
 423                                 break;
 424                         left--;
 425                 }
 426         }
 427         if (write && first)
 428                 return -EINVAL;
 429         *lenp -= left;
 430         *ppos += *lenp;
 431         return 0;
 432 }
 433
 434 #ifdef CONFIG_SYSCTL
 435 /*
 436  * Register our sysctl.
 437  */
 438 static ctl_table htab_ctl_table[]={
 439         {
 440                 .ctl_name       = KERN_PPC_L2CR,
 441                 .procname       = "l2cr",
 442                 .mode           = 0644,
 443                 .proc_handler   = &proc_dol2crvec,
 444         },
 445         { 0, },
 446 };
 447 static ctl_table htab_sysctl_root[] = {
 448         { 1, "kernel", NULL, 0, 0755, htab_ctl_table, },
 449         { 0,},
 450 };
 451
 452 static int __init
 453 register_ppc_htab_sysctl(void)
 454 {
 455         register_sysctl_table(htab_sysctl_root, 0);
 456
 457         return 0;
 458 }
 459
 460 __initcall(register_ppc_htab_sysctl);
 461 #endif