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