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/seq_file.h>
  22 #include <linux/init.h>
  23 #include <linux/bitops.h>
  24
  25 #include <asm/uaccess.h>
  26 #include <asm/mmu.h>
  27 #include <asm/residual.h>
  28 #include <asm/io.h>
  29 #include <asm/pgtable.h>
  30 #include <asm/cputable.h>
  31 #include <asm/system.h>
  32 #include <asm/reg.h>
  33
  34 static int ppc_htab_show(struct seq_file *m, void *v);
  35 static ssize_t ppc_htab_write(struct file * file, const char __user * buffer,
  36                               size_t count, loff_t *ppos);
  37 extern PTE *Hash, *Hash_end;
  38 extern unsigned long Hash_size, Hash_mask;
  39 extern unsigned long _SDR1;
  40 extern unsigned long htab_reloads;
  41 extern unsigned long htab_preloads;
  42 extern unsigned long htab_evicts;
  43 extern unsigned long pte_misses;
  44 extern unsigned long pte_errors;
  45 extern unsigned int primary_pteg_full;
  46 extern unsigned int htab_hash_searches;
  47
  48 static int ppc_htab_open(struct inode *inode, struct file *file)
  49 {
  50         return single_open(file, ppc_htab_show, NULL);
  51 }
  52
  53 const struct file_operations ppc_htab_operations = {
  54         .open           = ppc_htab_open,
  55         .read           = seq_read,
  56         .llseek         = seq_lseek,
  57         .write          = ppc_htab_write,
  58         .release        = single_release,
  59 };
  60
  61 static char *pmc1_lookup(unsigned long mmcr0)
  62 {
  63         switch ( mmcr0 & (0x7f<<7) )
  64         {
  65         case 0x0:
  66                 return "none";
  67         case MMCR0_PMC1_CYCLES:
  68                 return "cycles";
  69         case MMCR0_PMC1_ICACHEMISS:
  70                 return "ic miss";
  71         case MMCR0_PMC1_DTLB:
  72                 return "dtlb miss";
  73         default:
  74                 return "unknown";
  75         }
  76 }
  77
  78 static char *pmc2_lookup(unsigned long mmcr0)
  79 {
  80         switch ( mmcr0 & 0x3f )
  81         {
  82         case 0x0:
  83                 return "none";
  84         case MMCR0_PMC2_CYCLES:
  85                 return "cycles";
  86         case MMCR0_PMC2_DCACHEMISS:
  87                 return "dc miss";
  88         case MMCR0_PMC2_ITLB:
  89                 return "itlb miss";
  90         case MMCR0_PMC2_LOADMISSTIME:
  91                 return "load miss time";
  92         default:
  93                 return "unknown";
  94         }
  95 }
  96
  97 /*
  98  * print some useful info about the hash table.  This function
  99  * is _REALLY_ slow (see the nested for loops below) but nothing
 100  * in here should be really timing critical. -- Cort
 101  */
 102 static int ppc_htab_show(struct seq_file *m, void *v)
 103 {
 104         unsigned long mmcr0 = 0, pmc1 = 0, pmc2 = 0;
 105 #if defined(CONFIG_PPC_STD_MMU)
 106         unsigned int kptes = 0, uptes = 0;
 107         PTE *ptr;
 108 #endif /* CONFIG_PPC_STD_MMU */
 109
 110         if (cpu_has_feature(CPU_FTR_604_PERF_MON)) {
 111                 mmcr0 = mfspr(SPRN_MMCR0);
 112                 pmc1 = mfspr(SPRN_PMC1);
 113                 pmc2 = mfspr(SPRN_PMC2);
 114                 seq_printf(m,
 115                               "604 Performance Monitoring\n"
 116                               "MMCR0\t\t: %08lx %s%s ",
 117                               mmcr0,
 118                               ( mmcr0>>28 & 0x2 ) ? "(user mode counted)" : "",
 119                               ( mmcr0>>28 & 0x4 ) ? "(kernel mode counted)" : "");
 120                 seq_printf(m,
 121                               "\nPMC1\t\t: %08lx (%s)\n"
 122                               "PMC2\t\t: %08lx (%s)\n",
 123                               pmc1, pmc1_lookup(mmcr0),
 124                               pmc2, pmc2_lookup(mmcr0));
 125         }
 126
 127 #ifdef CONFIG_PPC_STD_MMU
 128         /* if we don't have a htab */
 129         if ( Hash_size == 0 ) {
 130                 seq_printf(m, "No Hash Table used\n");
 131                 return 0;
 132         }
 133
 134         for (ptr = Hash; ptr < Hash_end; ptr++) {
 135                 unsigned int mctx, vsid;
 136
 137                 if (!ptr->v)
 138                         continue;
 139                 /* undo the esid skew */
 140                 vsid = ptr->vsid;
 141                 mctx = ((vsid - (vsid & 0xf) * 0x111) >> 4) & 0xfffff;
 142                 if (mctx == 0)
 143                         kptes++;
 144                 else
 145                         uptes++;
 146         }
 147
 148         seq_printf(m,
 149                       "PTE Hash Table Information\n"
 150                       "Size\t\t: %luKb\n"
 151                       "Buckets\t\t: %lu\n"
 152                       "Address\t\t: %08lx\n"
 153                       "Entries\t\t: %lu\n"
 154                       "User ptes\t: %u\n"
 155                       "Kernel ptes\t: %u\n"
 156                       "Percent full\t: %lu%%\n"
 157                       , (unsigned long)(Hash_size>>10),
 158                       (Hash_size/(sizeof(PTE)*8)),
 159                       (unsigned long)Hash,
 160                       Hash_size/sizeof(PTE)
 161                       , uptes,
 162                       kptes,
 163                       ((kptes+uptes)*100) / (Hash_size/sizeof(PTE))
 164                 );
 165
 166         seq_printf(m,
 167                       "Reloads\t\t: %lu\n"
 168                       "Preloads\t: %lu\n"
 169                       "Searches\t: %u\n"
 170                       "Overflows\t: %u\n"
 171                       "Evicts\t\t: %lu\n",
 172                       htab_reloads, htab_preloads, htab_hash_searches,
 173                       primary_pteg_full, htab_evicts);
 174 #endif /* CONFIG_PPC_STD_MMU */
 175
 176         seq_printf(m,
 177                       "Non-error misses: %lu\n"
 178                       "Error misses\t: %lu\n",
 179                       pte_misses, pte_errors);
 180         return 0;
 181 }
 182
 183 /*
 184  * Allow user to define performance counters and resize the hash table
 185  */
 186 static ssize_t ppc_htab_write(struct file * file, const char __user * ubuffer,
 187                               size_t count, loff_t *ppos)
 188 {
 189 #ifdef CONFIG_PPC_STD_MMU
 190         unsigned long tmp;
 191         char buffer[16];
 192
 193         if (!capable(CAP_SYS_ADMIN))
 194                 return -EACCES;
 195         if (strncpy_from_user(buffer, ubuffer, 15))
 196                 return -EFAULT;
 197         buffer[15] = 0;
 198
 199         /* don't set the htab size for now */
 200         if ( !strncmp( buffer, "size ", 5) )
 201                 return -EBUSY;
 202
 203         if ( !strncmp( buffer, "reset", 5) )
 204         {
 205                 if (cpu_has_feature(CPU_FTR_604_PERF_MON)) {
 206                         /* reset PMC1 and PMC2 */
 207                         mtspr(SPRN_PMC1, 0);
 208                         mtspr(SPRN_PMC2, 0);
 209                 }
 210                 htab_reloads = 0;
 211                 htab_evicts = 0;
 212                 pte_misses = 0;
 213                 pte_errors = 0;
 214         }
 215
 216         /* Everything below here requires the performance monitor feature. */
 217         if (!cpu_has_feature(CPU_FTR_604_PERF_MON))
 218                 return count;
 219
 220         /* turn off performance monitoring */
 221         if ( !strncmp( buffer, "off", 3) )
 222         {
 223                 mtspr(SPRN_MMCR0, 0);
 224                 mtspr(SPRN_PMC1, 0);
 225                 mtspr(SPRN_PMC2, 0);
 226         }
 227
 228         if ( !strncmp( buffer, "user", 4) )
 229         {
 230                 /* setup mmcr0 and clear the correct pmc */
 231                 tmp = (mfspr(SPRN_MMCR0) & ~(0x60000000)) | 0x20000000;
 232                 mtspr(SPRN_MMCR0, tmp);
 233                 mtspr(SPRN_PMC1, 0);
 234                 mtspr(SPRN_PMC2, 0);
 235         }
 236
 237         if ( !strncmp( buffer, "kernel", 6) )
 238         {
 239                 /* setup mmcr0 and clear the correct pmc */
 240                 tmp = (mfspr(SPRN_MMCR0) & ~(0x60000000)) | 0x40000000;
 241                 mtspr(SPRN_MMCR0, tmp);
 242                 mtspr(SPRN_PMC1, 0);
 243                 mtspr(SPRN_PMC2, 0);
 244         }
 245
 246         /* PMC1 values */
 247         if ( !strncmp( buffer, "dtlb", 4) )
 248         {
 249                 /* setup mmcr0 and clear the correct pmc */
 250                 tmp = (mfspr(SPRN_MMCR0) & ~(0x7F << 7)) | MMCR0_PMC1_DTLB;
 251                 mtspr(SPRN_MMCR0, tmp);
 252                 mtspr(SPRN_PMC1, 0);
 253         }
 254
 255         if ( !strncmp( buffer, "ic miss", 7) )
 256         {
 257                 /* setup mmcr0 and clear the correct pmc */
 258                 tmp = (mfspr(SPRN_MMCR0) & ~(0x7F<<7)) | MMCR0_PMC1_ICACHEMISS;
 259                 mtspr(SPRN_MMCR0, tmp);
 260                 mtspr(SPRN_PMC1, 0);
 261         }
 262
 263         /* PMC2 values */
 264         if ( !strncmp( buffer, "load miss time", 14) )
 265         {
 266                 /* setup mmcr0 and clear the correct pmc */
 267                asm volatile(
 268                        "mfspr %0,%1\n\t"     /* get current mccr0 */
 269                        "rlwinm %0,%0,0,0,31-6\n\t"  /* clear bits [26-31] */
 270                        "ori   %0,%0,%2 \n\t" /* or in mmcr0 settings */
 271                        "mtspr %1,%0 \n\t"    /* set new mccr0 */
 272                        "mtspr %3,%4 \n\t"    /* reset the pmc */
 273                        : "=r" (tmp)
 274                        : "i" (SPRN_MMCR0),
 275                        "i" (MMCR0_PMC2_LOADMISSTIME),
 276                        "i" (SPRN_PMC2),  "r" (0) );
 277         }
 278
 279         if ( !strncmp( buffer, "itlb", 4) )
 280         {
 281                 /* setup mmcr0 and clear the correct pmc */
 282                asm volatile(
 283                        "mfspr %0,%1\n\t"     /* get current mccr0 */
 284                        "rlwinm %0,%0,0,0,31-6\n\t"  /* clear bits [26-31] */
 285                        "ori   %0,%0,%2 \n\t" /* or in mmcr0 settings */
 286                        "mtspr %1,%0 \n\t"    /* set new mccr0 */
 287                        "mtspr %3,%4 \n\t"    /* reset the pmc */
 288                        : "=r" (tmp)
 289                        : "i" (SPRN_MMCR0), "i" (MMCR0_PMC2_ITLB),
 290                        "i" (SPRN_PMC2),  "r" (0) );
 291         }
 292
 293         if ( !strncmp( buffer, "dc miss", 7) )
 294         {
 295                 /* setup mmcr0 and clear the correct pmc */
 296                asm volatile(
 297                        "mfspr %0,%1\n\t"     /* get current mccr0 */
 298                        "rlwinm %0,%0,0,0,31-6\n\t"  /* clear bits [26-31] */
 299                        "ori   %0,%0,%2 \n\t" /* or in mmcr0 settings */
 300                        "mtspr %1,%0 \n\t"    /* set new mccr0 */
 301                        "mtspr %3,%4 \n\t"    /* reset the pmc */
 302                        : "=r" (tmp)
 303                        : "i" (SPRN_MMCR0), "i" (MMCR0_PMC2_DCACHEMISS),
 304                        "i" (SPRN_PMC2),  "r" (0) );
 305         }
 306
 307         return count;
 308 #else /* CONFIG_PPC_STD_MMU */
 309         return 0;
 310 #endif /* CONFIG_PPC_STD_MMU */
 311 }
 312
 313 int proc_dol2crvec(ctl_table *table, int write, struct file *filp,
 314                   void __user *buffer_arg, size_t *lenp, loff_t *ppos)
 315 {
 316         int vleft, first=1, len, left, val;
 317         char __user *buffer = (char __user *) buffer_arg;
 318         #define TMPBUFLEN 256
 319         char buf[TMPBUFLEN], *p;
 320         static const char *sizestrings[4] = {
 321                 "2MB", "256KB", "512KB", "1MB"
 322         };
 323         static const char *clockstrings[8] = {
 324                 "clock disabled", "+1 clock", "+1.5 clock", "reserved(3)",
 325                 "+2 clock", "+2.5 clock", "+3 clock", "reserved(7)"
 326         };
 327         static const char *typestrings[4] = {
 328                 "flow-through burst SRAM", "reserved SRAM",
 329                 "pipelined burst SRAM", "pipelined late-write SRAM"
 330         };
 331         static const char *holdstrings[4] = {
 332                 "0.5", "1.0", "(reserved2)", "(reserved3)"
 333         };
 334
 335         if (!cpu_has_feature(CPU_FTR_L2CR))
 336                 return -EFAULT;
 337
 338         if ( /*!table->maxlen ||*/ (*ppos && !write)) {
 339                 *lenp = 0;
 340                 return 0;
 341         }
 342
 343         vleft = table->maxlen / sizeof(int);
 344         left = *lenp;
 345
 346         for (; left /*&& vleft--*/; first=0) {
 347                 if (write) {
 348                         while (left) {
 349                                 char c;
 350                                 if(get_user(c, buffer))
 351                                         return -EFAULT;
 352                                 if (!isspace(c))
 353                                         break;
 354                                 left--;
 355                                 buffer++;
 356                         }
 357                         if (!left)
 358                                 break;
 359                         len = left;
 360                         if (len > TMPBUFLEN-1)
 361                                 len = TMPBUFLEN-1;
 362                         if(copy_from_user(buf, buffer, len))
 363                                 return -EFAULT;
 364                         buf[len] = 0;
 365                         p = buf;
 366                         if (*p < '0' || *p > '9')
 367                                 break;
 368                         val = simple_strtoul(p, &p, 0);
 369                         len = p-buf;
 370                         if ((len < left) && *p && !isspace(*p))
 371                                 break;
 372                         buffer += len;
 373                         left -= len;
 374                         _set_L2CR(val);
 375                 } else {
 376                         p = buf;
 377                         if (!first)
 378                                 *p++ = '\t';
 379                         val = _get_L2CR();
 380                         p += sprintf(p, "0x%08x: ", val);
 381                         p += sprintf(p, " %s", (val >> 31) & 1 ? "enabled" :
 382                                         "disabled");
 383                         p += sprintf(p, ", %sparity", (val>>30)&1 ? "" : "no ");
 384                         p += sprintf(p, ", %s", sizestrings[(val >> 28) & 3]);
 385                         p += sprintf(p, ", %s", clockstrings[(val >> 25) & 7]);
 386                         p += sprintf(p, ", %s", typestrings[(val >> 23) & 2]);
 387                         p += sprintf(p, "%s", (val>>22)&1 ? ", data only" : "");
 388                         p += sprintf(p, "%s", (val>>20)&1 ? ", ZZ enabled": "");
 389                         p += sprintf(p, ", %s", (val>>19)&1 ? "write-through" :
 390                                         "copy-back");
 391                         p += sprintf(p, "%s", (val>>18)&1 ? ", testing" : "");
 392                         p += sprintf(p, ", %sns hold",holdstrings[(val>>16)&3]);
 393                         p += sprintf(p, "%s", (val>>15)&1 ? ", DLL slow" : "");
 394                         p += sprintf(p, "%s", (val>>14)&1 ? ", diff clock" :"");
 395                         p += sprintf(p, "%s", (val>>13)&1 ? ", DLL bypass" :"");
 396
 397                         p += sprintf(p,"\n");
 398
 399                         len = strlen(buf);
 400                         if (len > left)
 401                                 len = left;
 402                         if (copy_to_user(buffer, buf, len))
 403                                 return -EFAULT;
 404                         left -= len;
 405                         buffer += len;
 406                         break;
 407                 }
 408         }
 409
 410         if (!write && !first && left) {
 411                 if(put_user('\n', (char __user *) buffer))
 412                         return -EFAULT;
 413                 left--, buffer++;
 414         }
 415         if (write) {
 416                 char __user *s = (char __user *) buffer;
 417                 while (left) {
 418                         char c;
 419                         if(get_user(c, s++))
 420                                 return -EFAULT;
 421                         if (!isspace(c))
 422                                 break;
 423                         left--;
 424                 }
 425         }
 426         if (write && first)
 427                 return -EINVAL;
 428         *lenp -= left;
 429         *ppos += *lenp;
 430         return 0;
 431 }
 432
 433 #ifdef CONFIG_SYSCTL
 434 /*
 435  * Register our sysctl.
 436  */
 437 static ctl_table htab_ctl_table[]={
 438         {
 439                 .procname       = "l2cr",
 440                 .mode           = 0644,
 441                 .proc_handler   = &proc_dol2crvec,
 442         },
 443         {}
 444 };
 445 static ctl_table htab_sysctl_root[] = {
 446         {
 447                 .ctl_name       = CTL_KERN,
 448                 .procname       = "kernel",
 449                 .mode           = 0555,
 450                 .child          = htab_ctl_table,
 451         },
 452         {}
 453 };
 454
 455 static int __init
 456 register_ppc_htab_sysctl(void)
 457 {
 458         register_sysctl_table(htab_sysctl_root);
 459
 460         return 0;
 461 }
 462
 463 __initcall(register_ppc_htab_sysctl);
 464 #endif