arch/powerpc/platforms/cell/beat_htab.c

   1 /*
   2  * "Cell Reference Set" HTAB support.
   3  *
   4  * (C) Copyright 2006-2007 TOSHIBA CORPORATION
   5  *
   6  * This code is based on arch/powerpc/platforms/pseries/lpar.c:
   7  *  Copyright (C) 2001 Todd Inglett, IBM Corporation
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License along
  20  * with this program; if not, write to the Free Software Foundation, Inc.,
  21  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  22  */
  23
  24 #undef DEBUG_LOW
  25
  26 #include <linux/kernel.h>
  27 #include <linux/spinlock.h>
  28
  29 #include <asm/mmu.h>
  30 #include <asm/page.h>
  31 #include <asm/pgtable.h>
  32 #include <asm/machdep.h>
  33 #include <asm/udbg.h>
  34
  35 #include "beat_wrapper.h"
  36
  37 #ifdef DEBUG_LOW
  38 #define DBG_LOW(fmt...) do { udbg_printf(fmt); } while (0)
  39 #else
  40 #define DBG_LOW(fmt...) do { } while (0)
  41 #endif
  42
  43 static DEFINE_SPINLOCK(beat_htab_lock);
  44
  45 static inline unsigned int beat_read_mask(unsigned hpte_group)
  46 {
  47         unsigned long rmask = 0;
  48         u64 hpte_v[5];
  49
  50         beat_read_htab_entries(0, hpte_group + 0, hpte_v);
  51         if (!(hpte_v[0] & HPTE_V_BOLTED))
  52                 rmask |= 0x8000;
  53         if (!(hpte_v[1] & HPTE_V_BOLTED))
  54                 rmask |= 0x4000;
  55         if (!(hpte_v[2] & HPTE_V_BOLTED))
  56                 rmask |= 0x2000;
  57         if (!(hpte_v[3] & HPTE_V_BOLTED))
  58                 rmask |= 0x1000;
  59         beat_read_htab_entries(0, hpte_group + 4, hpte_v);
  60         if (!(hpte_v[0] & HPTE_V_BOLTED))
  61                 rmask |= 0x0800;
  62         if (!(hpte_v[1] & HPTE_V_BOLTED))
  63                 rmask |= 0x0400;
  64         if (!(hpte_v[2] & HPTE_V_BOLTED))
  65                 rmask |= 0x0200;
  66         if (!(hpte_v[3] & HPTE_V_BOLTED))
  67                 rmask |= 0x0100;
  68         hpte_group = ~hpte_group & (htab_hash_mask * HPTES_PER_GROUP);
  69         beat_read_htab_entries(0, hpte_group + 0, hpte_v);
  70         if (!(hpte_v[0] & HPTE_V_BOLTED))
  71                 rmask |= 0x80;
  72         if (!(hpte_v[1] & HPTE_V_BOLTED))
  73                 rmask |= 0x40;
  74         if (!(hpte_v[2] & HPTE_V_BOLTED))
  75                 rmask |= 0x20;
  76         if (!(hpte_v[3] & HPTE_V_BOLTED))
  77                 rmask |= 0x10;
  78         beat_read_htab_entries(0, hpte_group + 4, hpte_v);
  79         if (!(hpte_v[0] & HPTE_V_BOLTED))
  80                 rmask |= 0x08;
  81         if (!(hpte_v[1] & HPTE_V_BOLTED))
  82                 rmask |= 0x04;
  83         if (!(hpte_v[2] & HPTE_V_BOLTED))
  84                 rmask |= 0x02;
  85         if (!(hpte_v[3] & HPTE_V_BOLTED))
  86                 rmask |= 0x01;
  87         return rmask;
  88 }
  89
  90 static long beat_lpar_hpte_insert(unsigned long hpte_group,
  91                                   unsigned long va, unsigned long pa,
  92                                   unsigned long rflags, unsigned long vflags,
  93                                   int psize, int ssize)
  94 {
  95         unsigned long lpar_rc;
  96         u64 hpte_v, hpte_r, slot;
  97
  98         /* same as iseries */
  99         if (vflags & HPTE_V_SECONDARY)
 100                 return -1;
 101
 102         if (!(vflags & HPTE_V_BOLTED))
 103                 DBG_LOW("hpte_insert(group=%lx, va=%016lx, pa=%016lx, "
 104                         "rflags=%lx, vflags=%lx, psize=%d)\n",
 105                 hpte_group, va, pa, rflags, vflags, psize);
 106
 107         hpte_v = hpte_encode_v(va, psize, MMU_SEGSIZE_256M) |
 108                 vflags | HPTE_V_VALID;
 109         hpte_r = hpte_encode_r(pa, psize) | rflags;
 110
 111         if (!(vflags & HPTE_V_BOLTED))
 112                 DBG_LOW(" hpte_v=%016lx, hpte_r=%016lx\n", hpte_v, hpte_r);
 113
 114         if (rflags & _PAGE_NO_CACHE)
 115                 hpte_r &= ~_PAGE_COHERENT;
 116
 117         spin_lock(&beat_htab_lock);
 118         lpar_rc = beat_read_mask(hpte_group);
 119         if (lpar_rc == 0) {
 120                 if (!(vflags & HPTE_V_BOLTED))
 121                         DBG_LOW(" full\n");
 122                 spin_unlock(&beat_htab_lock);
 123                 return -1;
 124         }
 125
 126         lpar_rc = beat_insert_htab_entry(0, hpte_group, lpar_rc << 48,
 127                 hpte_v, hpte_r, &slot);
 128         spin_unlock(&beat_htab_lock);
 129
 130         /*
 131          * Since we try and ioremap PHBs we don't own, the pte insert
 132          * will fail. However we must catch the failure in hash_page
 133          * or we will loop forever, so return -2 in this case.
 134          */
 135         if (unlikely(lpar_rc != 0)) {
 136                 if (!(vflags & HPTE_V_BOLTED))
 137                         DBG_LOW(" lpar err %lx\n", lpar_rc);
 138                 return -2;
 139         }
 140         if (!(vflags & HPTE_V_BOLTED))
 141                 DBG_LOW(" -> slot: %lx\n", slot);
 142
 143         /* We have to pass down the secondary bucket bit here as well */
 144         return (slot ^ hpte_group) & 15;
 145 }
 146
 147 static long beat_lpar_hpte_remove(unsigned long hpte_group)
 148 {
 149         DBG_LOW("hpte_remove(group=%lx)\n", hpte_group);
 150         return -1;
 151 }
 152
 153 static unsigned long beat_lpar_hpte_getword0(unsigned long slot)
 154 {
 155         unsigned long dword0;
 156         unsigned long lpar_rc;
 157         u64 dword[5];
 158
 159         lpar_rc = beat_read_htab_entries(0, slot & ~3UL, dword);
 160
 161         dword0 = dword[slot&3];
 162
 163         BUG_ON(lpar_rc != 0);
 164
 165         return dword0;
 166 }
 167
 168 static void beat_lpar_hptab_clear(void)
 169 {
 170         unsigned long size_bytes = 1UL << ppc64_pft_size;
 171         unsigned long hpte_count = size_bytes >> 4;
 172         int i;
 173         u64 dummy0, dummy1;
 174
 175         /* TODO: Use bulk call */
 176         for (i = 0; i < hpte_count; i++)
 177                 beat_write_htab_entry(0, i, 0, 0, -1UL, -1UL, &dummy0, &dummy1);
 178 }
 179
 180 /*
 181  * NOTE: for updatepp ops we are fortunate that the linux "newpp" bits and
 182  * the low 3 bits of flags happen to line up.  So no transform is needed.
 183  * We can probably optimize here and assume the high bits of newpp are
 184  * already zero.  For now I am paranoid.
 185  */
 186 static long beat_lpar_hpte_updatepp(unsigned long slot,
 187                                     unsigned long newpp,
 188                                     unsigned long va,
 189                                     int psize, int ssize, int local)
 190 {
 191         unsigned long lpar_rc;
 192         u64 dummy0, dummy1;
 193         unsigned long want_v;
 194
 195         want_v = hpte_encode_v(va, psize, MMU_SEGSIZE_256M);
 196
 197         DBG_LOW("    update: "
 198                 "avpnv=%016lx, slot=%016lx, psize: %d, newpp %016lx ... ",
 199                 want_v & HPTE_V_AVPN, slot, psize, newpp);
 200
 201         spin_lock(&beat_htab_lock);
 202         dummy0 = beat_lpar_hpte_getword0(slot);
 203         if ((dummy0 & ~0x7FUL) != (want_v & ~0x7FUL)) {
 204                 DBG_LOW("not found !\n");
 205                 spin_unlock(&beat_htab_lock);
 206                 return -1;
 207         }
 208
 209         lpar_rc = beat_write_htab_entry(0, slot, 0, newpp, 0, 7, &dummy0,
 210                                         &dummy1);
 211         spin_unlock(&beat_htab_lock);
 212         if (lpar_rc != 0 || dummy0 == 0) {
 213                 DBG_LOW("not found !\n");
 214                 return -1;
 215         }
 216
 217         DBG_LOW("ok %lx %lx\n", dummy0, dummy1);
 218
 219         BUG_ON(lpar_rc != 0);
 220
 221         return 0;
 222 }
 223
 224 static long beat_lpar_hpte_find(unsigned long va, int psize)
 225 {
 226         unsigned long hash;
 227         unsigned long i, j;
 228         long slot;
 229         unsigned long want_v, hpte_v;
 230
 231         hash = hpt_hash(va, mmu_psize_defs[psize].shift, MMU_SEGSIZE_256M);
 232         want_v = hpte_encode_v(va, psize, MMU_SEGSIZE_256M);
 233
 234         for (j = 0; j < 2; j++) {
 235                 slot = (hash & htab_hash_mask) * HPTES_PER_GROUP;
 236                 for (i = 0; i < HPTES_PER_GROUP; i++) {
 237                         hpte_v = beat_lpar_hpte_getword0(slot);
 238
 239                         if (HPTE_V_COMPARE(hpte_v, want_v)
 240                             && (hpte_v & HPTE_V_VALID)
 241                             && (!!(hpte_v & HPTE_V_SECONDARY) == j)) {
 242                                 /* HPTE matches */
 243                                 if (j)
 244                                         slot = -slot;
 245                                 return slot;
 246                         }
 247                         ++slot;
 248                 }
 249                 hash = ~hash;
 250         }
 251
 252         return -1;
 253 }
 254
 255 static void beat_lpar_hpte_updateboltedpp(unsigned long newpp,
 256                                           unsigned long ea,
 257                                           int psize, int ssize)
 258 {
 259         unsigned long lpar_rc, slot, vsid, va;
 260         u64 dummy0, dummy1;
 261
 262         vsid = get_kernel_vsid(ea, MMU_SEGSIZE_256M);
 263         va = (vsid << 28) | (ea & 0x0fffffff);
 264
 265         spin_lock(&beat_htab_lock);
 266         slot = beat_lpar_hpte_find(va, psize);
 267         BUG_ON(slot == -1);
 268
 269         lpar_rc = beat_write_htab_entry(0, slot, 0, newpp, 0, 7,
 270                 &dummy0, &dummy1);
 271         spin_unlock(&beat_htab_lock);
 272
 273         BUG_ON(lpar_rc != 0);
 274 }
 275
 276 static void beat_lpar_hpte_invalidate(unsigned long slot, unsigned long va,
 277                                          int psize, int ssize, int local)
 278 {
 279         unsigned long want_v;
 280         unsigned long lpar_rc;
 281         u64 dummy1, dummy2;
 282         unsigned long flags;
 283
 284         DBG_LOW("    inval : slot=%lx, va=%016lx, psize: %d, local: %d\n",
 285                 slot, va, psize, local);
 286         want_v = hpte_encode_v(va, psize, MMU_SEGSIZE_256M);
 287
 288         spin_lock_irqsave(&beat_htab_lock, flags);
 289         dummy1 = beat_lpar_hpte_getword0(slot);
 290
 291         if ((dummy1 & ~0x7FUL) != (want_v & ~0x7FUL)) {
 292                 DBG_LOW("not found !\n");
 293                 spin_unlock_irqrestore(&beat_htab_lock, flags);
 294                 return;
 295         }
 296
 297         lpar_rc = beat_write_htab_entry(0, slot, 0, 0, HPTE_V_VALID, 0,
 298                 &dummy1, &dummy2);
 299         spin_unlock_irqrestore(&beat_htab_lock, flags);
 300
 301         BUG_ON(lpar_rc != 0);
 302 }
 303
 304 void __init hpte_init_beat(void)
 305 {
 306         ppc_md.hpte_invalidate  = beat_lpar_hpte_invalidate;
 307         ppc_md.hpte_updatepp    = beat_lpar_hpte_updatepp;
 308         ppc_md.hpte_updateboltedpp = beat_lpar_hpte_updateboltedpp;
 309         ppc_md.hpte_insert      = beat_lpar_hpte_insert;
 310         ppc_md.hpte_remove      = beat_lpar_hpte_remove;
 311         ppc_md.hpte_clear_all   = beat_lpar_hptab_clear;
 312 }
 313
 314 static long beat_lpar_hpte_insert_v3(unsigned long hpte_group,
 315                                   unsigned long va, unsigned long pa,
 316                                   unsigned long rflags, unsigned long vflags,
 317                                   int psize, int ssize)
 318 {
 319         unsigned long lpar_rc;
 320         u64 hpte_v, hpte_r, slot;
 321
 322         /* same as iseries */
 323         if (vflags & HPTE_V_SECONDARY)
 324                 return -1;
 325
 326         if (!(vflags & HPTE_V_BOLTED))
 327                 DBG_LOW("hpte_insert(group=%lx, va=%016lx, pa=%016lx, "
 328                         "rflags=%lx, vflags=%lx, psize=%d)\n",
 329                 hpte_group, va, pa, rflags, vflags, psize);
 330
 331         hpte_v = hpte_encode_v(va, psize, MMU_SEGSIZE_256M) |
 332                 vflags | HPTE_V_VALID;
 333         hpte_r = hpte_encode_r(pa, psize) | rflags;
 334
 335         if (!(vflags & HPTE_V_BOLTED))
 336                 DBG_LOW(" hpte_v=%016lx, hpte_r=%016lx\n", hpte_v, hpte_r);
 337
 338         if (rflags & _PAGE_NO_CACHE)
 339                 hpte_r &= ~_PAGE_COHERENT;
 340
 341         /* insert into not-volted entry */
 342         lpar_rc = beat_insert_htab_entry3(0, hpte_group, hpte_v, hpte_r,
 343                 HPTE_V_BOLTED, 0, &slot);
 344         /*
 345          * Since we try and ioremap PHBs we don't own, the pte insert
 346          * will fail. However we must catch the failure in hash_page
 347          * or we will loop forever, so return -2 in this case.
 348          */
 349         if (unlikely(lpar_rc != 0)) {
 350                 if (!(vflags & HPTE_V_BOLTED))
 351                         DBG_LOW(" lpar err %lx\n", lpar_rc);
 352                 return -2;
 353         }
 354         if (!(vflags & HPTE_V_BOLTED))
 355                 DBG_LOW(" -> slot: %lx\n", slot);
 356
 357         /* We have to pass down the secondary bucket bit here as well */
 358         return (slot ^ hpte_group) & 15;
 359 }
 360
 361 /*
 362  * NOTE: for updatepp ops we are fortunate that the linux "newpp" bits and
 363  * the low 3 bits of flags happen to line up.  So no transform is needed.
 364  * We can probably optimize here and assume the high bits of newpp are
 365  * already zero.  For now I am paranoid.
 366  */
 367 static long beat_lpar_hpte_updatepp_v3(unsigned long slot,
 368                                     unsigned long newpp,
 369                                     unsigned long va,
 370                                     int psize, int ssize, int local)
 371 {
 372         unsigned long lpar_rc;
 373         unsigned long want_v;
 374         unsigned long pss;
 375
 376         want_v = hpte_encode_v(va, psize, MMU_SEGSIZE_256M);
 377         pss = (psize == MMU_PAGE_4K) ? -1UL : mmu_psize_defs[psize].penc;
 378
 379         DBG_LOW("    update: "
 380                 "avpnv=%016lx, slot=%016lx, psize: %d, newpp %016lx ... ",
 381                 want_v & HPTE_V_AVPN, slot, psize, newpp);
 382
 383         lpar_rc = beat_update_htab_permission3(0, slot, want_v, pss, 7, newpp);
 384
 385         if (lpar_rc == 0xfffffff7) {
 386                 DBG_LOW("not found !\n");
 387                 return -1;
 388         }
 389
 390         DBG_LOW("ok\n");
 391
 392         BUG_ON(lpar_rc != 0);
 393
 394         return 0;
 395 }
 396
 397 static void beat_lpar_hpte_invalidate_v3(unsigned long slot, unsigned long va,
 398                                          int psize, int ssize, int local)
 399 {
 400         unsigned long want_v;
 401         unsigned long lpar_rc;
 402         unsigned long pss;
 403
 404         DBG_LOW("    inval : slot=%lx, va=%016lx, psize: %d, local: %d\n",
 405                 slot, va, psize, local);
 406         want_v = hpte_encode_v(va, psize, MMU_SEGSIZE_256M);
 407         pss = (psize == MMU_PAGE_4K) ? -1UL : mmu_psize_defs[psize].penc;
 408
 409         lpar_rc = beat_invalidate_htab_entry3(0, slot, want_v, pss);
 410
 411         /* E_busy can be valid output: page may be already replaced */
 412         BUG_ON(lpar_rc != 0 && lpar_rc != 0xfffffff7);
 413 }
 414
 415 static int64_t _beat_lpar_hptab_clear_v3(void)
 416 {
 417         return beat_clear_htab3(0);
 418 }
 419
 420 static void beat_lpar_hptab_clear_v3(void)
 421 {
 422         _beat_lpar_hptab_clear_v3();
 423 }
 424
 425 void __init hpte_init_beat_v3(void)
 426 {
 427         if (_beat_lpar_hptab_clear_v3() == 0) {
 428                 ppc_md.hpte_invalidate  = beat_lpar_hpte_invalidate_v3;
 429                 ppc_md.hpte_updatepp    = beat_lpar_hpte_updatepp_v3;
 430                 ppc_md.hpte_updateboltedpp = beat_lpar_hpte_updateboltedpp;
 431                 ppc_md.hpte_insert      = beat_lpar_hpte_insert_v3;
 432                 ppc_md.hpte_remove      = beat_lpar_hpte_remove;
 433                 ppc_md.hpte_clear_all   = beat_lpar_hptab_clear_v3;
 434         } else {
 435                 ppc_md.hpte_invalidate  = beat_lpar_hpte_invalidate;
 436                 ppc_md.hpte_updatepp    = beat_lpar_hpte_updatepp;
 437                 ppc_md.hpte_updateboltedpp = beat_lpar_hpte_updateboltedpp;
 438                 ppc_md.hpte_insert      = beat_lpar_hpte_insert;
 439                 ppc_md.hpte_remove      = beat_lpar_hpte_remove;
 440                 ppc_md.hpte_clear_all   = beat_lpar_hptab_clear;
 441         }
 442 }