arch/powerpc/platforms/pseries/lpar.c

   1 /*
   2  * pSeries_lpar.c
   3  * Copyright (C) 2001 Todd Inglett, IBM Corporation
   4  *
   5  * pSeries LPAR support.
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  20  */
  21
  22 /* Enables debugging of low-level hash table routines - careful! */
  23 #undef DEBUG
  24
  25 #include <linux/kernel.h>
  26 #include <linux/dma-mapping.h>
  27 #include <linux/console.h>
  28 #include <linux/export.h>
  29 #include <linux/jump_label.h>
  30 #include <linux/delay.h>
  31 #include <linux/stop_machine.h>
  32 #include <asm/processor.h>
  33 #include <asm/mmu.h>
  34 #include <asm/page.h>
  35 #include <asm/pgtable.h>
  36 #include <asm/machdep.h>
  37 #include <asm/mmu_context.h>
  38 #include <asm/iommu.h>
  39 #include <asm/tlbflush.h>
  40 #include <asm/tlb.h>
  41 #include <asm/prom.h>
  42 #include <asm/cputable.h>
  43 #include <asm/udbg.h>
  44 #include <asm/smp.h>
  45 #include <asm/trace.h>
  46 #include <asm/firmware.h>
  47 #include <asm/plpar_wrappers.h>
  48 #include <asm/kexec.h>
  49 #include <asm/fadump.h>
  50 #include <asm/asm-prototypes.h>
  51
  52 #include "pseries.h"
  53
  54 /* Flag bits for H_BULK_REMOVE */
  55 #define HBR_REQUEST     0x4000000000000000UL
  56 #define HBR_RESPONSE    0x8000000000000000UL
  57 #define HBR_END         0xc000000000000000UL
  58 #define HBR_AVPN        0x0200000000000000UL
  59 #define HBR_ANDCOND     0x0100000000000000UL
  60
  61
  62 /* in hvCall.S */
  63 EXPORT_SYMBOL(plpar_hcall);
  64 EXPORT_SYMBOL(plpar_hcall9);
  65 EXPORT_SYMBOL(plpar_hcall_norets);
  66
  67 void vpa_init(int cpu)
  68 {
  69         int hwcpu = get_hard_smp_processor_id(cpu);
  70         unsigned long addr;
  71         long ret;
  72         struct paca_struct *pp;
  73         struct dtl_entry *dtl;
  74
  75         /*
  76          * The spec says it "may be problematic" if CPU x registers the VPA of
  77          * CPU y. We should never do that, but wail if we ever do.
  78          */
  79         WARN_ON(cpu != smp_processor_id());
  80
  81         if (cpu_has_feature(CPU_FTR_ALTIVEC))
  82                 lppaca_of(cpu).vmxregs_in_use = 1;
  83
  84         if (cpu_has_feature(CPU_FTR_ARCH_207S))
  85                 lppaca_of(cpu).ebb_regs_in_use = 1;
  86
  87         addr = __pa(&lppaca_of(cpu));
  88         ret = register_vpa(hwcpu, addr);
  89
  90         if (ret) {
  91                 pr_err("WARNING: VPA registration for cpu %d (hw %d) of area "
  92                        "%lx failed with %ld\n", cpu, hwcpu, addr, ret);
  93                 return;
  94         }
  95
  96 #ifdef CONFIG_PPC_STD_MMU_64
  97         /*
  98          * PAPR says this feature is SLB-Buffer but firmware never
  99          * reports that.  All SPLPAR support SLB shadow buffer.
 100          */
 101         if (!radix_enabled() && firmware_has_feature(FW_FEATURE_SPLPAR)) {
 102                 addr = __pa(paca[cpu].slb_shadow_ptr);
 103                 ret = register_slb_shadow(hwcpu, addr);
 104                 if (ret)
 105                         pr_err("WARNING: SLB shadow buffer registration for "
 106                                "cpu %d (hw %d) of area %lx failed with %ld\n",
 107                                cpu, hwcpu, addr, ret);
 108         }
 109 #endif /* CONFIG_PPC_STD_MMU_64 */
 110
 111         /*
 112          * Register dispatch trace log, if one has been allocated.
 113          */
 114         pp = &paca[cpu];
 115         dtl = pp->dispatch_log;
 116         if (dtl) {
 117                 pp->dtl_ridx = 0;
 118                 pp->dtl_curr = dtl;
 119                 lppaca_of(cpu).dtl_idx = 0;
 120
 121                 /* hypervisor reads buffer length from this field */
 122                 dtl->enqueue_to_dispatch_time = cpu_to_be32(DISPATCH_LOG_BYTES);
 123                 ret = register_dtl(hwcpu, __pa(dtl));
 124                 if (ret)
 125                         pr_err("WARNING: DTL registration of cpu %d (hw %d) "
 126                                "failed with %ld\n", smp_processor_id(),
 127                                hwcpu, ret);
 128                 lppaca_of(cpu).dtl_enable_mask = 2;
 129         }
 130 }
 131
 132 #ifdef CONFIG_PPC_STD_MMU_64
 133
 134 static long pSeries_lpar_hpte_insert(unsigned long hpte_group,
 135                                      unsigned long vpn, unsigned long pa,
 136                                      unsigned long rflags, unsigned long vflags,
 137                                      int psize, int apsize, int ssize)
 138 {
 139         unsigned long lpar_rc;
 140         unsigned long flags;
 141         unsigned long slot;
 142         unsigned long hpte_v, hpte_r;
 143
 144         if (!(vflags & HPTE_V_BOLTED))
 145                 pr_devel("hpte_insert(group=%lx, vpn=%016lx, "
 146                          "pa=%016lx, rflags=%lx, vflags=%lx, psize=%d)\n",
 147                          hpte_group, vpn,  pa, rflags, vflags, psize);
 148
 149         hpte_v = hpte_encode_v(vpn, psize, apsize, ssize) | vflags | HPTE_V_VALID;
 150         hpte_r = hpte_encode_r(pa, psize, apsize) | rflags;
 151
 152         if (!(vflags & HPTE_V_BOLTED))
 153                 pr_devel(" hpte_v=%016lx, hpte_r=%016lx\n", hpte_v, hpte_r);
 154
 155         /* Now fill in the actual HPTE */
 156         /* Set CEC cookie to 0         */
 157         /* Zero page = 0               */
 158         /* I-cache Invalidate = 0      */
 159         /* I-cache synchronize = 0     */
 160         /* Exact = 0                   */
 161         flags = 0;
 162
 163         if (firmware_has_feature(FW_FEATURE_XCMO) && !(hpte_r & HPTE_R_N))
 164                 flags |= H_COALESCE_CAND;
 165
 166         lpar_rc = plpar_pte_enter(flags, hpte_group, hpte_v, hpte_r, &slot);
 167         if (unlikely(lpar_rc == H_PTEG_FULL)) {
 168                 if (!(vflags & HPTE_V_BOLTED))
 169                         pr_devel(" full\n");
 170                 return -1;
 171         }
 172
 173         /*
 174          * Since we try and ioremap PHBs we don't own, the pte insert
 175          * will fail. However we must catch the failure in hash_page
 176          * or we will loop forever, so return -2 in this case.
 177          */
 178         if (unlikely(lpar_rc != H_SUCCESS)) {
 179                 if (!(vflags & HPTE_V_BOLTED))
 180                         pr_devel(" lpar err %ld\n", lpar_rc);
 181                 return -2;
 182         }
 183         if (!(vflags & HPTE_V_BOLTED))
 184                 pr_devel(" -> slot: %lu\n", slot & 7);
 185
 186         /* Because of iSeries, we have to pass down the secondary
 187          * bucket bit here as well
 188          */
 189         return (slot & 7) | (!!(vflags & HPTE_V_SECONDARY) << 3);
 190 }
 191
 192 static DEFINE_SPINLOCK(pSeries_lpar_tlbie_lock);
 193
 194 static long pSeries_lpar_hpte_remove(unsigned long hpte_group)
 195 {
 196         unsigned long slot_offset;
 197         unsigned long lpar_rc;
 198         int i;
 199         unsigned long dummy1, dummy2;
 200
 201         /* pick a random slot to start at */
 202         slot_offset = mftb() & 0x7;
 203
 204         for (i = 0; i < HPTES_PER_GROUP; i++) {
 205
 206                 /* don't remove a bolted entry */
 207                 lpar_rc = plpar_pte_remove(H_ANDCOND, hpte_group + slot_offset,
 208                                            (0x1UL << 4), &dummy1, &dummy2);
 209                 if (lpar_rc == H_SUCCESS)
 210                         return i;
 211
 212                 /*
 213                  * The test for adjunct partition is performed before the
 214                  * ANDCOND test.  H_RESOURCE may be returned, so we need to
 215                  * check for that as well.
 216                  */
 217                 BUG_ON(lpar_rc != H_NOT_FOUND && lpar_rc != H_RESOURCE);
 218
 219                 slot_offset++;
 220                 slot_offset &= 0x7;
 221         }
 222
 223         return -1;
 224 }
 225
 226 static void manual_hpte_clear_all(void)
 227 {
 228         unsigned long size_bytes = 1UL << ppc64_pft_size;
 229         unsigned long hpte_count = size_bytes >> 4;
 230         struct {
 231                 unsigned long pteh;
 232                 unsigned long ptel;
 233         } ptes[4];
 234         long lpar_rc;
 235         unsigned long i, j;
 236
 237         /* Read in batches of 4,
 238          * invalidate only valid entries not in the VRMA
 239          * hpte_count will be a multiple of 4
 240          */
 241         for (i = 0; i < hpte_count; i += 4) {
 242                 lpar_rc = plpar_pte_read_4_raw(0, i, (void *)ptes);
 243                 if (lpar_rc != H_SUCCESS)
 244                         continue;
 245                 for (j = 0; j < 4; j++){
 246                         if ((ptes[j].pteh & HPTE_V_VRMA_MASK) ==
 247                                 HPTE_V_VRMA_MASK)
 248                                 continue;
 249                         if (ptes[j].pteh & HPTE_V_VALID)
 250                                 plpar_pte_remove_raw(0, i + j, 0,
 251                                         &(ptes[j].pteh), &(ptes[j].ptel));
 252                 }
 253         }
 254 }
 255
 256 static int hcall_hpte_clear_all(void)
 257 {
 258         int rc;
 259
 260         do {
 261                 rc = plpar_hcall_norets(H_CLEAR_HPT);
 262         } while (rc == H_CONTINUE);
 263
 264         return rc;
 265 }
 266
 267 static void pseries_hpte_clear_all(void)
 268 {
 269         int rc;
 270
 271         rc = hcall_hpte_clear_all();
 272         if (rc != H_SUCCESS)
 273                 manual_hpte_clear_all();
 274
 275 #ifdef __LITTLE_ENDIAN__
 276         /*
 277          * Reset exceptions to big endian.
 278          *
 279          * FIXME this is a hack for kexec, we need to reset the exception
 280          * endian before starting the new kernel and this is a convenient place
 281          * to do it.
 282          *
 283          * This is also called on boot when a fadump happens. In that case we
 284          * must not change the exception endian mode.
 285          */
 286         if (firmware_has_feature(FW_FEATURE_SET_MODE) && !is_fadump_active())
 287                 pseries_big_endian_exceptions();
 288 #endif
 289 }
 290
 291 /*
 292  * NOTE: for updatepp ops we are fortunate that the linux "newpp" bits and
 293  * the low 3 bits of flags happen to line up.  So no transform is needed.
 294  * We can probably optimize here and assume the high bits of newpp are
 295  * already zero.  For now I am paranoid.
 296  */
 297 static long pSeries_lpar_hpte_updatepp(unsigned long slot,
 298                                        unsigned long newpp,
 299                                        unsigned long vpn,
 300                                        int psize, int apsize,
 301                                        int ssize, unsigned long inv_flags)
 302 {
 303         unsigned long lpar_rc;
 304         unsigned long flags = (newpp & 7) | H_AVPN;
 305         unsigned long want_v;
 306
 307         want_v = hpte_encode_avpn(vpn, psize, ssize);
 308
 309         pr_devel("    update: avpnv=%016lx, hash=%016lx, f=%lx, psize: %d ...",
 310                  want_v, slot, flags, psize);
 311
 312         lpar_rc = plpar_pte_protect(flags, slot, want_v);
 313
 314         if (lpar_rc == H_NOT_FOUND) {
 315                 pr_devel("not found !\n");
 316                 return -1;
 317         }
 318
 319         pr_devel("ok\n");
 320
 321         BUG_ON(lpar_rc != H_SUCCESS);
 322
 323         return 0;
 324 }
 325
 326 static long __pSeries_lpar_hpte_find(unsigned long want_v, unsigned long hpte_group)
 327 {
 328         long lpar_rc;
 329         unsigned long i, j;
 330         struct {
 331                 unsigned long pteh;
 332                 unsigned long ptel;
 333         } ptes[4];
 334
 335         for (i = 0; i < HPTES_PER_GROUP; i += 4, hpte_group += 4) {
 336
 337                 lpar_rc = plpar_pte_read_4(0, hpte_group, (void *)ptes);
 338                 if (lpar_rc != H_SUCCESS)
 339                         continue;
 340
 341                 for (j = 0; j < 4; j++) {
 342                         if (HPTE_V_COMPARE(ptes[j].pteh, want_v) &&
 343                             (ptes[j].pteh & HPTE_V_VALID))
 344                                 return i + j;
 345                 }
 346         }
 347
 348         return -1;
 349 }
 350
 351 static long pSeries_lpar_hpte_find(unsigned long vpn, int psize, int ssize)
 352 {
 353         long slot;
 354         unsigned long hash;
 355         unsigned long want_v;
 356         unsigned long hpte_group;
 357
 358         hash = hpt_hash(vpn, mmu_psize_defs[psize].shift, ssize);
 359         want_v = hpte_encode_avpn(vpn, psize, ssize);
 360
 361         /* Bolted entries are always in the primary group */
 362         hpte_group = (hash & htab_hash_mask) * HPTES_PER_GROUP;
 363         slot = __pSeries_lpar_hpte_find(want_v, hpte_group);
 364         if (slot < 0)
 365                 return -1;
 366         return hpte_group + slot;
 367 }
 368
 369 static void pSeries_lpar_hpte_updateboltedpp(unsigned long newpp,
 370                                              unsigned long ea,
 371                                              int psize, int ssize)
 372 {
 373         unsigned long vpn;
 374         unsigned long lpar_rc, slot, vsid, flags;
 375
 376         vsid = get_kernel_vsid(ea, ssize);
 377         vpn = hpt_vpn(ea, vsid, ssize);
 378
 379         slot = pSeries_lpar_hpte_find(vpn, psize, ssize);
 380         BUG_ON(slot == -1);
 381
 382         flags = newpp & 7;
 383         lpar_rc = plpar_pte_protect(flags, slot, 0);
 384
 385         BUG_ON(lpar_rc != H_SUCCESS);
 386 }
 387
 388 static void pSeries_lpar_hpte_invalidate(unsigned long slot, unsigned long vpn,
 389                                          int psize, int apsize,
 390                                          int ssize, int local)
 391 {
 392         unsigned long want_v;
 393         unsigned long lpar_rc;
 394         unsigned long dummy1, dummy2;
 395
 396         pr_devel("    inval : slot=%lx, vpn=%016lx, psize: %d, local: %d\n",
 397                  slot, vpn, psize, local);
 398
 399         want_v = hpte_encode_avpn(vpn, psize, ssize);
 400         lpar_rc = plpar_pte_remove(H_AVPN, slot, want_v, &dummy1, &dummy2);
 401         if (lpar_rc == H_NOT_FOUND)
 402                 return;
 403
 404         BUG_ON(lpar_rc != H_SUCCESS);
 405 }
 406
 407 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
 408 /*
 409  * Limit iterations holding pSeries_lpar_tlbie_lock to 3. We also need
 410  * to make sure that we avoid bouncing the hypervisor tlbie lock.
 411  */
 412 #define PPC64_HUGE_HPTE_BATCH 12
 413
 414 static void __pSeries_lpar_hugepage_invalidate(unsigned long *slot,
 415                                              unsigned long *vpn, int count,
 416                                              int psize, int ssize)
 417 {
 418         unsigned long param[PLPAR_HCALL9_BUFSIZE];
 419         int i = 0, pix = 0, rc;
 420         unsigned long flags = 0;
 421         int lock_tlbie = !mmu_has_feature(MMU_FTR_LOCKLESS_TLBIE);
 422
 423         if (lock_tlbie)
 424                 spin_lock_irqsave(&pSeries_lpar_tlbie_lock, flags);
 425
 426         for (i = 0; i < count; i++) {
 427
 428                 if (!firmware_has_feature(FW_FEATURE_BULK_REMOVE)) {
 429                         pSeries_lpar_hpte_invalidate(slot[i], vpn[i], psize, 0,
 430                                                      ssize, 0);
 431                 } else {
 432                         param[pix] = HBR_REQUEST | HBR_AVPN | slot[i];
 433                         param[pix+1] = hpte_encode_avpn(vpn[i], psize, ssize);
 434                         pix += 2;
 435                         if (pix == 8) {
 436                                 rc = plpar_hcall9(H_BULK_REMOVE, param,
 437                                                   param[0], param[1], param[2],
 438                                                   param[3], param[4], param[5],
 439                                                   param[6], param[7]);
 440                                 BUG_ON(rc != H_SUCCESS);
 441                                 pix = 0;
 442                         }
 443                 }
 444         }
 445         if (pix) {
 446                 param[pix] = HBR_END;
 447                 rc = plpar_hcall9(H_BULK_REMOVE, param, param[0], param[1],
 448                                   param[2], param[3], param[4], param[5],
 449                                   param[6], param[7]);
 450                 BUG_ON(rc != H_SUCCESS);
 451         }
 452
 453         if (lock_tlbie)
 454                 spin_unlock_irqrestore(&pSeries_lpar_tlbie_lock, flags);
 455 }
 456
 457 static void pSeries_lpar_hugepage_invalidate(unsigned long vsid,
 458                                              unsigned long addr,
 459                                              unsigned char *hpte_slot_array,
 460                                              int psize, int ssize, int local)
 461 {
 462         int i, index = 0;
 463         unsigned long s_addr = addr;
 464         unsigned int max_hpte_count, valid;
 465         unsigned long vpn_array[PPC64_HUGE_HPTE_BATCH];
 466         unsigned long slot_array[PPC64_HUGE_HPTE_BATCH];
 467         unsigned long shift, hidx, vpn = 0, hash, slot;
 468
 469         shift = mmu_psize_defs[psize].shift;
 470         max_hpte_count = 1U << (PMD_SHIFT - shift);
 471
 472         for (i = 0; i < max_hpte_count; i++) {
 473                 valid = hpte_valid(hpte_slot_array, i);
 474                 if (!valid)
 475                         continue;
 476                 hidx =  hpte_hash_index(hpte_slot_array, i);
 477
 478                 /* get the vpn */
 479                 addr = s_addr + (i * (1ul << shift));
 480                 vpn = hpt_vpn(addr, vsid, ssize);
 481                 hash = hpt_hash(vpn, shift, ssize);
 482                 if (hidx & _PTEIDX_SECONDARY)
 483                         hash = ~hash;
 484
 485                 slot = (hash & htab_hash_mask) * HPTES_PER_GROUP;
 486                 slot += hidx & _PTEIDX_GROUP_IX;
 487
 488                 slot_array[index] = slot;
 489                 vpn_array[index] = vpn;
 490                 if (index == PPC64_HUGE_HPTE_BATCH - 1) {
 491                         /*
 492                          * Now do a bluk invalidate
 493                          */
 494                         __pSeries_lpar_hugepage_invalidate(slot_array,
 495                                                            vpn_array,
 496                                                            PPC64_HUGE_HPTE_BATCH,
 497                                                            psize, ssize);
 498                         index = 0;
 499                 } else
 500                         index++;
 501         }
 502         if (index)
 503                 __pSeries_lpar_hugepage_invalidate(slot_array, vpn_array,
 504                                                    index, psize, ssize);
 505 }
 506 #else
 507 static void pSeries_lpar_hugepage_invalidate(unsigned long vsid,
 508                                              unsigned long addr,
 509                                              unsigned char *hpte_slot_array,
 510                                              int psize, int ssize, int local)
 511 {
 512         WARN(1, "%s called without THP support\n", __func__);
 513 }
 514 #endif
 515
 516 static int pSeries_lpar_hpte_removebolted(unsigned long ea,
 517                                           int psize, int ssize)
 518 {
 519         unsigned long vpn;
 520         unsigned long slot, vsid;
 521
 522         vsid = get_kernel_vsid(ea, ssize);
 523         vpn = hpt_vpn(ea, vsid, ssize);
 524
 525         slot = pSeries_lpar_hpte_find(vpn, psize, ssize);
 526         if (slot == -1)
 527                 return -ENOENT;
 528
 529         /*
 530          * lpar doesn't use the passed actual page size
 531          */
 532         pSeries_lpar_hpte_invalidate(slot, vpn, psize, 0, ssize, 0);
 533         return 0;
 534 }
 535
 536 /*
 537  * Take a spinlock around flushes to avoid bouncing the hypervisor tlbie
 538  * lock.
 539  */
 540 static void pSeries_lpar_flush_hash_range(unsigned long number, int local)
 541 {
 542         unsigned long vpn;
 543         unsigned long i, pix, rc;
 544         unsigned long flags = 0;
 545         struct ppc64_tlb_batch *batch = this_cpu_ptr(&ppc64_tlb_batch);
 546         int lock_tlbie = !mmu_has_feature(MMU_FTR_LOCKLESS_TLBIE);
 547         unsigned long param[PLPAR_HCALL9_BUFSIZE];
 548         unsigned long hash, index, shift, hidx, slot;
 549         real_pte_t pte;
 550         int psize, ssize;
 551
 552         if (lock_tlbie)
 553                 spin_lock_irqsave(&pSeries_lpar_tlbie_lock, flags);
 554
 555         psize = batch->psize;
 556         ssize = batch->ssize;
 557         pix = 0;
 558         for (i = 0; i < number; i++) {
 559                 vpn = batch->vpn[i];
 560                 pte = batch->pte[i];
 561                 pte_iterate_hashed_subpages(pte, psize, vpn, index, shift) {
 562                         hash = hpt_hash(vpn, shift, ssize);
 563                         hidx = __rpte_to_hidx(pte, index);
 564                         if (hidx & _PTEIDX_SECONDARY)
 565                                 hash = ~hash;
 566                         slot = (hash & htab_hash_mask) * HPTES_PER_GROUP;
 567                         slot += hidx & _PTEIDX_GROUP_IX;
 568                         if (!firmware_has_feature(FW_FEATURE_BULK_REMOVE)) {
 569                                 /*
 570                                  * lpar doesn't use the passed actual page size
 571                                  */
 572                                 pSeries_lpar_hpte_invalidate(slot, vpn, psize,
 573                                                              0, ssize, local);
 574                         } else {
 575                                 param[pix] = HBR_REQUEST | HBR_AVPN | slot;
 576                                 param[pix+1] = hpte_encode_avpn(vpn, psize,
 577                                                                 ssize);
 578                                 pix += 2;
 579                                 if (pix == 8) {
 580                                         rc = plpar_hcall9(H_BULK_REMOVE, param,
 581                                                 param[0], param[1], param[2],
 582                                                 param[3], param[4], param[5],
 583                                                 param[6], param[7]);
 584                                         BUG_ON(rc != H_SUCCESS);
 585                                         pix = 0;
 586                                 }
 587                         }
 588                 } pte_iterate_hashed_end();
 589         }
 590         if (pix) {
 591                 param[pix] = HBR_END;
 592                 rc = plpar_hcall9(H_BULK_REMOVE, param, param[0], param[1],
 593                                   param[2], param[3], param[4], param[5],
 594                                   param[6], param[7]);
 595                 BUG_ON(rc != H_SUCCESS);
 596         }
 597
 598         if (lock_tlbie)
 599                 spin_unlock_irqrestore(&pSeries_lpar_tlbie_lock, flags);
 600 }
 601
 602 static int __init disable_bulk_remove(char *str)
 603 {
 604         if (strcmp(str, "off") == 0 &&
 605             firmware_has_feature(FW_FEATURE_BULK_REMOVE)) {
 606                         printk(KERN_INFO "Disabling BULK_REMOVE firmware feature");
 607                         powerpc_firmware_features &= ~FW_FEATURE_BULK_REMOVE;
 608         }
 609         return 1;
 610 }
 611
 612 __setup("bulk_remove=", disable_bulk_remove);
 613
 614 #define HPT_RESIZE_TIMEOUT      10000 /* ms */
 615
 616 struct hpt_resize_state {
 617         unsigned long shift;
 618         int commit_rc;
 619 };
 620
 621 static int pseries_lpar_resize_hpt_commit(void *data)
 622 {
 623         struct hpt_resize_state *state = data;
 624
 625         state->commit_rc = plpar_resize_hpt_commit(0, state->shift);
 626         if (state->commit_rc != H_SUCCESS)
 627                 return -EIO;
 628
 629         /* Hypervisor has transitioned the HTAB, update our globals */
 630         ppc64_pft_size = state->shift;
 631         htab_size_bytes = 1UL << ppc64_pft_size;
 632         htab_hash_mask = (htab_size_bytes >> 7) - 1;
 633
 634         return 0;
 635 }
 636
 637 /* Must be called in user context */
 638 static int pseries_lpar_resize_hpt(unsigned long shift)
 639 {
 640         struct hpt_resize_state state = {
 641                 .shift = shift,
 642                 .commit_rc = H_FUNCTION,
 643         };
 644         unsigned int delay, total_delay = 0;
 645         int rc;
 646         ktime_t t0, t1, t2;
 647
 648         might_sleep();
 649
 650         if (!firmware_has_feature(FW_FEATURE_HPT_RESIZE))
 651                 return -ENODEV;
 652
 653         printk(KERN_INFO "lpar: Attempting to resize HPT to shift %lu\n",
 654                shift);
 655
 656         t0 = ktime_get();
 657
 658         rc = plpar_resize_hpt_prepare(0, shift);
 659         while (H_IS_LONG_BUSY(rc)) {
 660                 delay = get_longbusy_msecs(rc);
 661                 total_delay += delay;
 662                 if (total_delay > HPT_RESIZE_TIMEOUT) {
 663                         /* prepare with shift==0 cancels an in-progress resize */
 664                         rc = plpar_resize_hpt_prepare(0, 0);
 665                         if (rc != H_SUCCESS)
 666                                 printk(KERN_WARNING
 667                                        "lpar: Unexpected error %d cancelling timed out HPT resize\n",
 668                                        rc);
 669                         return -ETIMEDOUT;
 670                 }
 671                 msleep(delay);
 672                 rc = plpar_resize_hpt_prepare(0, shift);
 673         };
 674
 675         switch (rc) {
 676         case H_SUCCESS:
 677                 /* Continue on */
 678                 break;
 679
 680         case H_PARAMETER:
 681                 return -EINVAL;
 682         case H_RESOURCE:
 683                 return -EPERM;
 684         default:
 685                 printk(KERN_WARNING
 686                        "lpar: Unexpected error %d from H_RESIZE_HPT_PREPARE\n",
 687                        rc);
 688                 return -EIO;
 689         }
 690
 691         t1 = ktime_get();
 692
 693         rc = stop_machine(pseries_lpar_resize_hpt_commit, &state, NULL);
 694
 695         t2 = ktime_get();
 696
 697         if (rc != 0) {
 698                 switch (state.commit_rc) {
 699                 case H_PTEG_FULL:
 700                         printk(KERN_WARNING
 701                                "lpar: Hash collision while resizing HPT\n");
 702                         return -ENOSPC;
 703
 704                 default:
 705                         printk(KERN_WARNING
 706                                "lpar: Unexpected error %d from H_RESIZE_HPT_COMMIT\n",
 707                                state.commit_rc);
 708                         return -EIO;
 709                 };
 710         }
 711
 712         printk(KERN_INFO
 713                "lpar: HPT resize to shift %lu complete (%lld ms / %lld ms)\n",
 714                shift, (long long) ktime_ms_delta(t1, t0),
 715                (long long) ktime_ms_delta(t2, t1));
 716
 717         return 0;
 718 }
 719
 720 /* Actually only used for radix, so far */
 721 static int pseries_lpar_register_process_table(unsigned long base,
 722                         unsigned long page_size, unsigned long table_size)
 723 {
 724         long rc;
 725         unsigned long flags = PROC_TABLE_NEW;
 726
 727         if (radix_enabled())
 728                 flags |= PROC_TABLE_RADIX | PROC_TABLE_GTSE;
 729         for (;;) {
 730                 rc = plpar_hcall_norets(H_REGISTER_PROC_TBL, flags, base,
 731                                         page_size, table_size);
 732                 if (!H_IS_LONG_BUSY(rc))
 733                         break;
 734                 mdelay(get_longbusy_msecs(rc));
 735         }
 736         if (rc != H_SUCCESS) {
 737                 pr_err("Failed to register process table (rc=%ld)\n", rc);
 738                 BUG();
 739         }
 740         return rc;
 741 }
 742
 743 void __init hpte_init_pseries(void)
 744 {
 745         mmu_hash_ops.hpte_invalidate     = pSeries_lpar_hpte_invalidate;
 746         mmu_hash_ops.hpte_updatepp       = pSeries_lpar_hpte_updatepp;
 747         mmu_hash_ops.hpte_updateboltedpp = pSeries_lpar_hpte_updateboltedpp;
 748         mmu_hash_ops.hpte_insert         = pSeries_lpar_hpte_insert;
 749         mmu_hash_ops.hpte_remove         = pSeries_lpar_hpte_remove;
 750         mmu_hash_ops.hpte_removebolted   = pSeries_lpar_hpte_removebolted;
 751         mmu_hash_ops.flush_hash_range    = pSeries_lpar_flush_hash_range;
 752         mmu_hash_ops.hpte_clear_all      = pseries_hpte_clear_all;
 753         mmu_hash_ops.hugepage_invalidate = pSeries_lpar_hugepage_invalidate;
 754         mmu_hash_ops.resize_hpt          = pseries_lpar_resize_hpt;
 755 }
 756
 757 void radix_init_pseries(void)
 758 {
 759         pr_info("Using radix MMU under hypervisor\n");
 760         register_process_table = pseries_lpar_register_process_table;
 761 }
 762
 763 #ifdef CONFIG_PPC_SMLPAR
 764 #define CMO_FREE_HINT_DEFAULT 1
 765 static int cmo_free_hint_flag = CMO_FREE_HINT_DEFAULT;
 766
 767 static int __init cmo_free_hint(char *str)
 768 {
 769         char *parm;
 770         parm = strstrip(str);
 771
 772         if (strcasecmp(parm, "no") == 0 || strcasecmp(parm, "off") == 0) {
 773                 printk(KERN_INFO "cmo_free_hint: CMO free page hinting is not active.\n");
 774                 cmo_free_hint_flag = 0;
 775                 return 1;
 776         }
 777
 778         cmo_free_hint_flag = 1;
 779         printk(KERN_INFO "cmo_free_hint: CMO free page hinting is active.\n");
 780
 781         if (strcasecmp(parm, "yes") == 0 || strcasecmp(parm, "on") == 0)
 782                 return 1;
 783
 784         return 0;
 785 }
 786
 787 __setup("cmo_free_hint=", cmo_free_hint);
 788
 789 static void pSeries_set_page_state(struct page *page, int order,
 790                                    unsigned long state)
 791 {
 792         int i, j;
 793         unsigned long cmo_page_sz, addr;
 794
 795         cmo_page_sz = cmo_get_page_size();
 796         addr = __pa((unsigned long)page_address(page));
 797
 798         for (i = 0; i < (1 << order); i++, addr += PAGE_SIZE) {
 799                 for (j = 0; j < PAGE_SIZE; j += cmo_page_sz)
 800                         plpar_hcall_norets(H_PAGE_INIT, state, addr + j, 0);
 801         }
 802 }
 803
 804 void arch_free_page(struct page *page, int order)
 805 {
 806         if (radix_enabled())
 807                 return;
 808         if (!cmo_free_hint_flag || !firmware_has_feature(FW_FEATURE_CMO))
 809                 return;
 810
 811         pSeries_set_page_state(page, order, H_PAGE_SET_UNUSED);
 812 }
 813 EXPORT_SYMBOL(arch_free_page);
 814
 815 #endif /* CONFIG_PPC_SMLPAR */
 816 #endif /* CONFIG_PPC_STD_MMU_64 */
 817
 818 #ifdef CONFIG_TRACEPOINTS
 819 #ifdef HAVE_JUMP_LABEL
 820 struct static_key hcall_tracepoint_key = STATIC_KEY_INIT;
 821
 822 int hcall_tracepoint_regfunc(void)
 823 {
 824         static_key_slow_inc(&hcall_tracepoint_key);
 825         return 0;
 826 }
 827
 828 void hcall_tracepoint_unregfunc(void)
 829 {
 830         static_key_slow_dec(&hcall_tracepoint_key);
 831 }
 832 #else
 833 /*
 834  * We optimise our hcall path by placing hcall_tracepoint_refcount
 835  * directly in the TOC so we can check if the hcall tracepoints are
 836  * enabled via a single load.
 837  */
 838
 839 /* NB: reg/unreg are called while guarded with the tracepoints_mutex */
 840 extern long hcall_tracepoint_refcount;
 841
 842 int hcall_tracepoint_regfunc(void)
 843 {
 844         hcall_tracepoint_refcount++;
 845         return 0;
 846 }
 847
 848 void hcall_tracepoint_unregfunc(void)
 849 {
 850         hcall_tracepoint_refcount--;
 851 }
 852 #endif
 853
 854 /*
 855  * Since the tracing code might execute hcalls we need to guard against
 856  * recursion. One example of this are spinlocks calling H_YIELD on
 857  * shared processor partitions.
 858  */
 859 static DEFINE_PER_CPU(unsigned int, hcall_trace_depth);
 860
 861
 862 void __trace_hcall_entry(unsigned long opcode, unsigned long *args)
 863 {
 864         unsigned long flags;
 865         unsigned int *depth;
 866
 867         /*
 868          * We cannot call tracepoints inside RCU idle regions which
 869          * means we must not trace H_CEDE.
 870          */
 871         if (opcode == H_CEDE)
 872                 return;
 873
 874         local_irq_save(flags);
 875
 876         depth = this_cpu_ptr(&hcall_trace_depth);
 877
 878         if (*depth)
 879                 goto out;
 880
 881         (*depth)++;
 882         preempt_disable();
 883         trace_hcall_entry(opcode, args);
 884         (*depth)--;
 885
 886 out:
 887         local_irq_restore(flags);
 888 }
 889
 890 void __trace_hcall_exit(long opcode, unsigned long retval,
 891                         unsigned long *retbuf)
 892 {
 893         unsigned long flags;
 894         unsigned int *depth;
 895
 896         if (opcode == H_CEDE)
 897                 return;
 898
 899         local_irq_save(flags);
 900
 901         depth = this_cpu_ptr(&hcall_trace_depth);
 902
 903         if (*depth)
 904                 goto out;
 905
 906         (*depth)++;
 907         trace_hcall_exit(opcode, retval, retbuf);
 908         preempt_enable();
 909         (*depth)--;
 910
 911 out:
 912         local_irq_restore(flags);
 913 }
 914 #endif
 915
 916 /**
 917  * h_get_mpp
 918  * H_GET_MPP hcall returns info in 7 parms
 919  */
 920 int h_get_mpp(struct hvcall_mpp_data *mpp_data)
 921 {
 922         int rc;
 923         unsigned long retbuf[PLPAR_HCALL9_BUFSIZE];
 924
 925         rc = plpar_hcall9(H_GET_MPP, retbuf);
 926
 927         mpp_data->entitled_mem = retbuf[0];
 928         mpp_data->mapped_mem = retbuf[1];
 929
 930         mpp_data->group_num = (retbuf[2] >> 2 * 8) & 0xffff;
 931         mpp_data->pool_num = retbuf[2] & 0xffff;
 932
 933         mpp_data->mem_weight = (retbuf[3] >> 7 * 8) & 0xff;
 934         mpp_data->unallocated_mem_weight = (retbuf[3] >> 6 * 8) & 0xff;
 935         mpp_data->unallocated_entitlement = retbuf[3] & 0xffffffffffffUL;
 936
 937         mpp_data->pool_size = retbuf[4];
 938         mpp_data->loan_request = retbuf[5];
 939         mpp_data->backing_mem = retbuf[6];
 940
 941         return rc;
 942 }
 943 EXPORT_SYMBOL(h_get_mpp);
 944
 945 int h_get_mpp_x(struct hvcall_mpp_x_data *mpp_x_data)
 946 {
 947         int rc;
 948         unsigned long retbuf[PLPAR_HCALL9_BUFSIZE] = { 0 };
 949
 950         rc = plpar_hcall9(H_GET_MPP_X, retbuf);
 951
 952         mpp_x_data->coalesced_bytes = retbuf[0];
 953         mpp_x_data->pool_coalesced_bytes = retbuf[1];
 954         mpp_x_data->pool_purr_cycles = retbuf[2];
 955         mpp_x_data->pool_spurr_cycles = retbuf[3];
 956
 957         return rc;
 958 }