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 <asm/processor.h>
  31 #include <asm/mmu.h>
  32 #include <asm/page.h>
  33 #include <asm/pgtable.h>
  34 #include <asm/machdep.h>
  35 #include <asm/mmu_context.h>
  36 #include <asm/iommu.h>
  37 #include <asm/tlbflush.h>
  38 #include <asm/tlb.h>
  39 #include <asm/prom.h>
  40 #include <asm/cputable.h>
  41 #include <asm/udbg.h>
  42 #include <asm/smp.h>
  43 #include <asm/trace.h>
  44 #include <asm/firmware.h>
  45 #include <asm/plpar_wrappers.h>
  46 #include <asm/kexec.h>
  47 #include <asm/fadump.h>
  48 #include <asm/asm-prototypes.h>
  49
  50 #include "pseries.h"
  51
  52 /* Flag bits for H_BULK_REMOVE */
  53 #define HBR_REQUEST     0x4000000000000000UL
  54 #define HBR_RESPONSE    0x8000000000000000UL
  55 #define HBR_END         0xc000000000000000UL
  56 #define HBR_AVPN        0x0200000000000000UL
  57 #define HBR_ANDCOND     0x0100000000000000UL
  58
  59
  60 /* in hvCall.S */
  61 EXPORT_SYMBOL(plpar_hcall);
  62 EXPORT_SYMBOL(plpar_hcall9);
  63 EXPORT_SYMBOL(plpar_hcall_norets);
  64
  65 void vpa_init(int cpu)
  66 {
  67         int hwcpu = get_hard_smp_processor_id(cpu);
  68         unsigned long addr;
  69         long ret;
  70         struct paca_struct *pp;
  71         struct dtl_entry *dtl;
  72
  73         /*
  74          * The spec says it "may be problematic" if CPU x registers the VPA of
  75          * CPU y. We should never do that, but wail if we ever do.
  76          */
  77         WARN_ON(cpu != smp_processor_id());
  78
  79         if (cpu_has_feature(CPU_FTR_ALTIVEC))
  80                 lppaca_of(cpu).vmxregs_in_use = 1;
  81
  82         if (cpu_has_feature(CPU_FTR_ARCH_207S))
  83                 lppaca_of(cpu).ebb_regs_in_use = 1;
  84
  85         addr = __pa(&lppaca_of(cpu));
  86         ret = register_vpa(hwcpu, addr);
  87
  88         if (ret) {
  89                 pr_err("WARNING: VPA registration for cpu %d (hw %d) of area "
  90                        "%lx failed with %ld\n", cpu, hwcpu, addr, ret);
  91                 return;
  92         }
  93
  94 #ifdef CONFIG_PPC_STD_MMU_64
  95         /*
  96          * PAPR says this feature is SLB-Buffer but firmware never
  97          * reports that.  All SPLPAR support SLB shadow buffer.
  98          */
  99         if (!radix_enabled() && firmware_has_feature(FW_FEATURE_SPLPAR)) {
 100                 addr = __pa(paca[cpu].slb_shadow_ptr);
 101                 ret = register_slb_shadow(hwcpu, addr);
 102                 if (ret)
 103                         pr_err("WARNING: SLB shadow buffer registration for "
 104                                "cpu %d (hw %d) of area %lx failed with %ld\n",
 105                                cpu, hwcpu, addr, ret);
 106         }
 107 #endif /* CONFIG_PPC_STD_MMU_64 */
 108
 109         /*
 110          * Register dispatch trace log, if one has been allocated.
 111          */
 112         pp = &paca[cpu];
 113         dtl = pp->dispatch_log;
 114         if (dtl) {
 115                 pp->dtl_ridx = 0;
 116                 pp->dtl_curr = dtl;
 117                 lppaca_of(cpu).dtl_idx = 0;
 118
 119                 /* hypervisor reads buffer length from this field */
 120                 dtl->enqueue_to_dispatch_time = cpu_to_be32(DISPATCH_LOG_BYTES);
 121                 ret = register_dtl(hwcpu, __pa(dtl));
 122                 if (ret)
 123                         pr_err("WARNING: DTL registration of cpu %d (hw %d) "
 124                                "failed with %ld\n", smp_processor_id(),
 125                                hwcpu, ret);
 126                 lppaca_of(cpu).dtl_enable_mask = 2;
 127         }
 128 }
 129
 130 #ifdef CONFIG_PPC_STD_MMU_64
 131
 132 static long pSeries_lpar_hpte_insert(unsigned long hpte_group,
 133                                      unsigned long vpn, unsigned long pa,
 134                                      unsigned long rflags, unsigned long vflags,
 135                                      int psize, int apsize, int ssize)
 136 {
 137         unsigned long lpar_rc;
 138         unsigned long flags;
 139         unsigned long slot;
 140         unsigned long hpte_v, hpte_r;
 141
 142         if (!(vflags & HPTE_V_BOLTED))
 143                 pr_devel("hpte_insert(group=%lx, vpn=%016lx, "
 144                          "pa=%016lx, rflags=%lx, vflags=%lx, psize=%d)\n",
 145                          hpte_group, vpn,  pa, rflags, vflags, psize);
 146
 147         hpte_v = hpte_encode_v(vpn, psize, apsize, ssize) | vflags | HPTE_V_VALID;
 148         hpte_r = hpte_encode_r(pa, psize, apsize, ssize) | rflags;
 149
 150         if (!(vflags & HPTE_V_BOLTED))
 151                 pr_devel(" hpte_v=%016lx, hpte_r=%016lx\n", hpte_v, hpte_r);
 152
 153         /* Now fill in the actual HPTE */
 154         /* Set CEC cookie to 0         */
 155         /* Zero page = 0               */
 156         /* I-cache Invalidate = 0      */
 157         /* I-cache synchronize = 0     */
 158         /* Exact = 0                   */
 159         flags = 0;
 160
 161         if (firmware_has_feature(FW_FEATURE_XCMO) && !(hpte_r & HPTE_R_N))
 162                 flags |= H_COALESCE_CAND;
 163
 164         lpar_rc = plpar_pte_enter(flags, hpte_group, hpte_v, hpte_r, &slot);
 165         if (unlikely(lpar_rc == H_PTEG_FULL)) {
 166                 if (!(vflags & HPTE_V_BOLTED))
 167                         pr_devel(" full\n");
 168                 return -1;
 169         }
 170
 171         /*
 172          * Since we try and ioremap PHBs we don't own, the pte insert
 173          * will fail. However we must catch the failure in hash_page
 174          * or we will loop forever, so return -2 in this case.
 175          */
 176         if (unlikely(lpar_rc != H_SUCCESS)) {
 177                 if (!(vflags & HPTE_V_BOLTED))
 178                         pr_devel(" lpar err %ld\n", lpar_rc);
 179                 return -2;
 180         }
 181         if (!(vflags & HPTE_V_BOLTED))
 182                 pr_devel(" -> slot: %lu\n", slot & 7);
 183
 184         /* Because of iSeries, we have to pass down the secondary
 185          * bucket bit here as well
 186          */
 187         return (slot & 7) | (!!(vflags & HPTE_V_SECONDARY) << 3);
 188 }
 189
 190 static DEFINE_SPINLOCK(pSeries_lpar_tlbie_lock);
 191
 192 static long pSeries_lpar_hpte_remove(unsigned long hpte_group)
 193 {
 194         unsigned long slot_offset;
 195         unsigned long lpar_rc;
 196         int i;
 197         unsigned long dummy1, dummy2;
 198
 199         /* pick a random slot to start at */
 200         slot_offset = mftb() & 0x7;
 201
 202         for (i = 0; i < HPTES_PER_GROUP; i++) {
 203
 204                 /* don't remove a bolted entry */
 205                 lpar_rc = plpar_pte_remove(H_ANDCOND, hpte_group + slot_offset,
 206                                            (0x1UL << 4), &dummy1, &dummy2);
 207                 if (lpar_rc == H_SUCCESS)
 208                         return i;
 209
 210                 /*
 211                  * The test for adjunct partition is performed before the
 212                  * ANDCOND test.  H_RESOURCE may be returned, so we need to
 213                  * check for that as well.
 214                  */
 215                 BUG_ON(lpar_rc != H_NOT_FOUND && lpar_rc != H_RESOURCE);
 216
 217                 slot_offset++;
 218                 slot_offset &= 0x7;
 219         }
 220
 221         return -1;
 222 }
 223
 224 static void pSeries_lpar_hptab_clear(void)
 225 {
 226         unsigned long size_bytes = 1UL << ppc64_pft_size;
 227         unsigned long hpte_count = size_bytes >> 4;
 228         struct {
 229                 unsigned long pteh;
 230                 unsigned long ptel;
 231         } ptes[4];
 232         long lpar_rc;
 233         unsigned long i, j;
 234
 235         /* Read in batches of 4,
 236          * invalidate only valid entries not in the VRMA
 237          * hpte_count will be a multiple of 4
 238          */
 239         for (i = 0; i < hpte_count; i += 4) {
 240                 lpar_rc = plpar_pte_read_4_raw(0, i, (void *)ptes);
 241                 if (lpar_rc != H_SUCCESS)
 242                         continue;
 243                 for (j = 0; j < 4; j++){
 244                         if ((ptes[j].pteh & HPTE_V_VRMA_MASK) ==
 245                                 HPTE_V_VRMA_MASK)
 246                                 continue;
 247                         if (ptes[j].pteh & HPTE_V_VALID)
 248                                 plpar_pte_remove_raw(0, i + j, 0,
 249                                         &(ptes[j].pteh), &(ptes[j].ptel));
 250                 }
 251         }
 252
 253 #ifdef __LITTLE_ENDIAN__
 254         /*
 255          * Reset exceptions to big endian.
 256          *
 257          * FIXME this is a hack for kexec, we need to reset the exception
 258          * endian before starting the new kernel and this is a convenient place
 259          * to do it.
 260          *
 261          * This is also called on boot when a fadump happens. In that case we
 262          * must not change the exception endian mode.
 263          */
 264         if (firmware_has_feature(FW_FEATURE_SET_MODE) && !is_fadump_active()) {
 265                 long rc;
 266
 267                 rc = pseries_big_endian_exceptions();
 268                 /*
 269                  * At this point it is unlikely panic() will get anything
 270                  * out to the user, but at least this will stop us from
 271                  * continuing on further and creating an even more
 272                  * difficult to debug situation.
 273                  *
 274                  * There is a known problem when kdump'ing, if cpus are offline
 275                  * the above call will fail. Rather than panicking again, keep
 276                  * going and hope the kdump kernel is also little endian, which
 277                  * it usually is.
 278                  */
 279                 if (rc && !kdump_in_progress())
 280                         panic("Could not enable big endian exceptions");
 281         }
 282 #endif
 283 }
 284
 285 /*
 286  * NOTE: for updatepp ops we are fortunate that the linux "newpp" bits and
 287  * the low 3 bits of flags happen to line up.  So no transform is needed.
 288  * We can probably optimize here and assume the high bits of newpp are
 289  * already zero.  For now I am paranoid.
 290  */
 291 static long pSeries_lpar_hpte_updatepp(unsigned long slot,
 292                                        unsigned long newpp,
 293                                        unsigned long vpn,
 294                                        int psize, int apsize,
 295                                        int ssize, unsigned long inv_flags)
 296 {
 297         unsigned long lpar_rc;
 298         unsigned long flags = (newpp & 7) | H_AVPN;
 299         unsigned long want_v;
 300
 301         want_v = hpte_encode_avpn(vpn, psize, ssize);
 302
 303         pr_devel("    update: avpnv=%016lx, hash=%016lx, f=%lx, psize: %d ...",
 304                  want_v, slot, flags, psize);
 305
 306         lpar_rc = plpar_pte_protect(flags, slot, want_v);
 307
 308         if (lpar_rc == H_NOT_FOUND) {
 309                 pr_devel("not found !\n");
 310                 return -1;
 311         }
 312
 313         pr_devel("ok\n");
 314
 315         BUG_ON(lpar_rc != H_SUCCESS);
 316
 317         return 0;
 318 }
 319
 320 static long __pSeries_lpar_hpte_find(unsigned long want_v, unsigned long hpte_group)
 321 {
 322         long lpar_rc;
 323         unsigned long i, j;
 324         struct {
 325                 unsigned long pteh;
 326                 unsigned long ptel;
 327         } ptes[4];
 328
 329         for (i = 0; i < HPTES_PER_GROUP; i += 4, hpte_group += 4) {
 330
 331                 lpar_rc = plpar_pte_read_4(0, hpte_group, (void *)ptes);
 332                 if (lpar_rc != H_SUCCESS)
 333                         continue;
 334
 335                 for (j = 0; j < 4; j++) {
 336                         if (HPTE_V_COMPARE(ptes[j].pteh, want_v) &&
 337                             (ptes[j].pteh & HPTE_V_VALID))
 338                                 return i + j;
 339                 }
 340         }
 341
 342         return -1;
 343 }
 344
 345 static long pSeries_lpar_hpte_find(unsigned long vpn, int psize, int ssize)
 346 {
 347         long slot;
 348         unsigned long hash;
 349         unsigned long want_v;
 350         unsigned long hpte_group;
 351
 352         hash = hpt_hash(vpn, mmu_psize_defs[psize].shift, ssize);
 353         want_v = hpte_encode_avpn(vpn, psize, ssize);
 354
 355         /* Bolted entries are always in the primary group */
 356         hpte_group = (hash & htab_hash_mask) * HPTES_PER_GROUP;
 357         slot = __pSeries_lpar_hpte_find(want_v, hpte_group);
 358         if (slot < 0)
 359                 return -1;
 360         return hpte_group + slot;
 361 }
 362
 363 static void pSeries_lpar_hpte_updateboltedpp(unsigned long newpp,
 364                                              unsigned long ea,
 365                                              int psize, int ssize)
 366 {
 367         unsigned long vpn;
 368         unsigned long lpar_rc, slot, vsid, flags;
 369
 370         vsid = get_kernel_vsid(ea, ssize);
 371         vpn = hpt_vpn(ea, vsid, ssize);
 372
 373         slot = pSeries_lpar_hpte_find(vpn, psize, ssize);
 374         BUG_ON(slot == -1);
 375
 376         flags = newpp & 7;
 377         lpar_rc = plpar_pte_protect(flags, slot, 0);
 378
 379         BUG_ON(lpar_rc != H_SUCCESS);
 380 }
 381
 382 static void pSeries_lpar_hpte_invalidate(unsigned long slot, unsigned long vpn,
 383                                          int psize, int apsize,
 384                                          int ssize, int local)
 385 {
 386         unsigned long want_v;
 387         unsigned long lpar_rc;
 388         unsigned long dummy1, dummy2;
 389
 390         pr_devel("    inval : slot=%lx, vpn=%016lx, psize: %d, local: %d\n",
 391                  slot, vpn, psize, local);
 392
 393         want_v = hpte_encode_avpn(vpn, psize, ssize);
 394         lpar_rc = plpar_pte_remove(H_AVPN, slot, want_v, &dummy1, &dummy2);
 395         if (lpar_rc == H_NOT_FOUND)
 396                 return;
 397
 398         BUG_ON(lpar_rc != H_SUCCESS);
 399 }
 400
 401 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
 402 /*
 403  * Limit iterations holding pSeries_lpar_tlbie_lock to 3. We also need
 404  * to make sure that we avoid bouncing the hypervisor tlbie lock.
 405  */
 406 #define PPC64_HUGE_HPTE_BATCH 12
 407
 408 static void __pSeries_lpar_hugepage_invalidate(unsigned long *slot,
 409                                              unsigned long *vpn, int count,
 410                                              int psize, int ssize)
 411 {
 412         unsigned long param[8];
 413         int i = 0, pix = 0, rc;
 414         unsigned long flags = 0;
 415         int lock_tlbie = !mmu_has_feature(MMU_FTR_LOCKLESS_TLBIE);
 416
 417         if (lock_tlbie)
 418                 spin_lock_irqsave(&pSeries_lpar_tlbie_lock, flags);
 419
 420         for (i = 0; i < count; i++) {
 421
 422                 if (!firmware_has_feature(FW_FEATURE_BULK_REMOVE)) {
 423                         pSeries_lpar_hpte_invalidate(slot[i], vpn[i], psize, 0,
 424                                                      ssize, 0);
 425                 } else {
 426                         param[pix] = HBR_REQUEST | HBR_AVPN | slot[i];
 427                         param[pix+1] = hpte_encode_avpn(vpn[i], psize, ssize);
 428                         pix += 2;
 429                         if (pix == 8) {
 430                                 rc = plpar_hcall9(H_BULK_REMOVE, param,
 431                                                   param[0], param[1], param[2],
 432                                                   param[3], param[4], param[5],
 433                                                   param[6], param[7]);
 434                                 BUG_ON(rc != H_SUCCESS);
 435                                 pix = 0;
 436                         }
 437                 }
 438         }
 439         if (pix) {
 440                 param[pix] = HBR_END;
 441                 rc = plpar_hcall9(H_BULK_REMOVE, param, param[0], param[1],
 442                                   param[2], param[3], param[4], param[5],
 443                                   param[6], param[7]);
 444                 BUG_ON(rc != H_SUCCESS);
 445         }
 446
 447         if (lock_tlbie)
 448                 spin_unlock_irqrestore(&pSeries_lpar_tlbie_lock, flags);
 449 }
 450
 451 static void pSeries_lpar_hugepage_invalidate(unsigned long vsid,
 452                                              unsigned long addr,
 453                                              unsigned char *hpte_slot_array,
 454                                              int psize, int ssize, int local)
 455 {
 456         int i, index = 0;
 457         unsigned long s_addr = addr;
 458         unsigned int max_hpte_count, valid;
 459         unsigned long vpn_array[PPC64_HUGE_HPTE_BATCH];
 460         unsigned long slot_array[PPC64_HUGE_HPTE_BATCH];
 461         unsigned long shift, hidx, vpn = 0, hash, slot;
 462
 463         shift = mmu_psize_defs[psize].shift;
 464         max_hpte_count = 1U << (PMD_SHIFT - shift);
 465
 466         for (i = 0; i < max_hpte_count; i++) {
 467                 valid = hpte_valid(hpte_slot_array, i);
 468                 if (!valid)
 469                         continue;
 470                 hidx =  hpte_hash_index(hpte_slot_array, i);
 471
 472                 /* get the vpn */
 473                 addr = s_addr + (i * (1ul << shift));
 474                 vpn = hpt_vpn(addr, vsid, ssize);
 475                 hash = hpt_hash(vpn, shift, ssize);
 476                 if (hidx & _PTEIDX_SECONDARY)
 477                         hash = ~hash;
 478
 479                 slot = (hash & htab_hash_mask) * HPTES_PER_GROUP;
 480                 slot += hidx & _PTEIDX_GROUP_IX;
 481
 482                 slot_array[index] = slot;
 483                 vpn_array[index] = vpn;
 484                 if (index == PPC64_HUGE_HPTE_BATCH - 1) {
 485                         /*
 486                          * Now do a bluk invalidate
 487                          */
 488                         __pSeries_lpar_hugepage_invalidate(slot_array,
 489                                                            vpn_array,
 490                                                            PPC64_HUGE_HPTE_BATCH,
 491                                                            psize, ssize);
 492                         index = 0;
 493                 } else
 494                         index++;
 495         }
 496         if (index)
 497                 __pSeries_lpar_hugepage_invalidate(slot_array, vpn_array,
 498                                                    index, psize, ssize);
 499 }
 500 #else
 501 static void pSeries_lpar_hugepage_invalidate(unsigned long vsid,
 502                                              unsigned long addr,
 503                                              unsigned char *hpte_slot_array,
 504                                              int psize, int ssize, int local)
 505 {
 506         WARN(1, "%s called without THP support\n", __func__);
 507 }
 508 #endif
 509
 510 static int pSeries_lpar_hpte_removebolted(unsigned long ea,
 511                                           int psize, int ssize)
 512 {
 513         unsigned long vpn;
 514         unsigned long slot, vsid;
 515
 516         vsid = get_kernel_vsid(ea, ssize);
 517         vpn = hpt_vpn(ea, vsid, ssize);
 518
 519         slot = pSeries_lpar_hpte_find(vpn, psize, ssize);
 520         if (slot == -1)
 521                 return -ENOENT;
 522
 523         /*
 524          * lpar doesn't use the passed actual page size
 525          */
 526         pSeries_lpar_hpte_invalidate(slot, vpn, psize, 0, ssize, 0);
 527         return 0;
 528 }
 529
 530 /*
 531  * Take a spinlock around flushes to avoid bouncing the hypervisor tlbie
 532  * lock.
 533  */
 534 static void pSeries_lpar_flush_hash_range(unsigned long number, int local)
 535 {
 536         unsigned long vpn;
 537         unsigned long i, pix, rc;
 538         unsigned long flags = 0;
 539         struct ppc64_tlb_batch *batch = this_cpu_ptr(&ppc64_tlb_batch);
 540         int lock_tlbie = !mmu_has_feature(MMU_FTR_LOCKLESS_TLBIE);
 541         unsigned long param[9];
 542         unsigned long hash, index, shift, hidx, slot;
 543         real_pte_t pte;
 544         int psize, ssize;
 545
 546         if (lock_tlbie)
 547                 spin_lock_irqsave(&pSeries_lpar_tlbie_lock, flags);
 548
 549         psize = batch->psize;
 550         ssize = batch->ssize;
 551         pix = 0;
 552         for (i = 0; i < number; i++) {
 553                 vpn = batch->vpn[i];
 554                 pte = batch->pte[i];
 555                 pte_iterate_hashed_subpages(pte, psize, vpn, index, shift) {
 556                         hash = hpt_hash(vpn, shift, ssize);
 557                         hidx = __rpte_to_hidx(pte, index);
 558                         if (hidx & _PTEIDX_SECONDARY)
 559                                 hash = ~hash;
 560                         slot = (hash & htab_hash_mask) * HPTES_PER_GROUP;
 561                         slot += hidx & _PTEIDX_GROUP_IX;
 562                         if (!firmware_has_feature(FW_FEATURE_BULK_REMOVE)) {
 563                                 /*
 564                                  * lpar doesn't use the passed actual page size
 565                                  */
 566                                 pSeries_lpar_hpte_invalidate(slot, vpn, psize,
 567                                                              0, ssize, local);
 568                         } else {
 569                                 param[pix] = HBR_REQUEST | HBR_AVPN | slot;
 570                                 param[pix+1] = hpte_encode_avpn(vpn, psize,
 571                                                                 ssize);
 572                                 pix += 2;
 573                                 if (pix == 8) {
 574                                         rc = plpar_hcall9(H_BULK_REMOVE, param,
 575                                                 param[0], param[1], param[2],
 576                                                 param[3], param[4], param[5],
 577                                                 param[6], param[7]);
 578                                         BUG_ON(rc != H_SUCCESS);
 579                                         pix = 0;
 580                                 }
 581                         }
 582                 } pte_iterate_hashed_end();
 583         }
 584         if (pix) {
 585                 param[pix] = HBR_END;
 586                 rc = plpar_hcall9(H_BULK_REMOVE, param, param[0], param[1],
 587                                   param[2], param[3], param[4], param[5],
 588                                   param[6], param[7]);
 589                 BUG_ON(rc != H_SUCCESS);
 590         }
 591
 592         if (lock_tlbie)
 593                 spin_unlock_irqrestore(&pSeries_lpar_tlbie_lock, flags);
 594 }
 595
 596 static int __init disable_bulk_remove(char *str)
 597 {
 598         if (strcmp(str, "off") == 0 &&
 599             firmware_has_feature(FW_FEATURE_BULK_REMOVE)) {
 600                         printk(KERN_INFO "Disabling BULK_REMOVE firmware feature");
 601                         powerpc_firmware_features &= ~FW_FEATURE_BULK_REMOVE;
 602         }
 603         return 1;
 604 }
 605
 606 __setup("bulk_remove=", disable_bulk_remove);
 607
 608 void __init hpte_init_lpar(void)
 609 {
 610         ppc_md.hpte_invalidate  = pSeries_lpar_hpte_invalidate;
 611         ppc_md.hpte_updatepp    = pSeries_lpar_hpte_updatepp;
 612         ppc_md.hpte_updateboltedpp = pSeries_lpar_hpte_updateboltedpp;
 613         ppc_md.hpte_insert      = pSeries_lpar_hpte_insert;
 614         ppc_md.hpte_remove      = pSeries_lpar_hpte_remove;
 615         ppc_md.hpte_removebolted = pSeries_lpar_hpte_removebolted;
 616         ppc_md.flush_hash_range = pSeries_lpar_flush_hash_range;
 617         ppc_md.hpte_clear_all   = pSeries_lpar_hptab_clear;
 618         ppc_md.hugepage_invalidate = pSeries_lpar_hugepage_invalidate;
 619 }
 620
 621 #ifdef CONFIG_PPC_SMLPAR
 622 #define CMO_FREE_HINT_DEFAULT 1
 623 static int cmo_free_hint_flag = CMO_FREE_HINT_DEFAULT;
 624
 625 static int __init cmo_free_hint(char *str)
 626 {
 627         char *parm;
 628         parm = strstrip(str);
 629
 630         if (strcasecmp(parm, "no") == 0 || strcasecmp(parm, "off") == 0) {
 631                 printk(KERN_INFO "cmo_free_hint: CMO free page hinting is not active.\n");
 632                 cmo_free_hint_flag = 0;
 633                 return 1;
 634         }
 635
 636         cmo_free_hint_flag = 1;
 637         printk(KERN_INFO "cmo_free_hint: CMO free page hinting is active.\n");
 638
 639         if (strcasecmp(parm, "yes") == 0 || strcasecmp(parm, "on") == 0)
 640                 return 1;
 641
 642         return 0;
 643 }
 644
 645 __setup("cmo_free_hint=", cmo_free_hint);
 646
 647 static void pSeries_set_page_state(struct page *page, int order,
 648                                    unsigned long state)
 649 {
 650         int i, j;
 651         unsigned long cmo_page_sz, addr;
 652
 653         cmo_page_sz = cmo_get_page_size();
 654         addr = __pa((unsigned long)page_address(page));
 655
 656         for (i = 0; i < (1 << order); i++, addr += PAGE_SIZE) {
 657                 for (j = 0; j < PAGE_SIZE; j += cmo_page_sz)
 658                         plpar_hcall_norets(H_PAGE_INIT, state, addr + j, 0);
 659         }
 660 }
 661
 662 void arch_free_page(struct page *page, int order)
 663 {
 664         if (radix_enabled())
 665                 return;
 666         if (!cmo_free_hint_flag || !firmware_has_feature(FW_FEATURE_CMO))
 667                 return;
 668
 669         pSeries_set_page_state(page, order, H_PAGE_SET_UNUSED);
 670 }
 671 EXPORT_SYMBOL(arch_free_page);
 672
 673 #endif /* CONFIG_PPC_SMLPAR */
 674 #endif /* CONFIG_PPC_STD_MMU_64 */
 675
 676 #ifdef CONFIG_TRACEPOINTS
 677 #ifdef HAVE_JUMP_LABEL
 678 struct static_key hcall_tracepoint_key = STATIC_KEY_INIT;
 679
 680 void hcall_tracepoint_regfunc(void)
 681 {
 682         static_key_slow_inc(&hcall_tracepoint_key);
 683 }
 684
 685 void hcall_tracepoint_unregfunc(void)
 686 {
 687         static_key_slow_dec(&hcall_tracepoint_key);
 688 }
 689 #else
 690 /*
 691  * We optimise our hcall path by placing hcall_tracepoint_refcount
 692  * directly in the TOC so we can check if the hcall tracepoints are
 693  * enabled via a single load.
 694  */
 695
 696 /* NB: reg/unreg are called while guarded with the tracepoints_mutex */
 697 extern long hcall_tracepoint_refcount;
 698
 699 void hcall_tracepoint_regfunc(void)
 700 {
 701         hcall_tracepoint_refcount++;
 702 }
 703
 704 void hcall_tracepoint_unregfunc(void)
 705 {
 706         hcall_tracepoint_refcount--;
 707 }
 708 #endif
 709
 710 /*
 711  * Since the tracing code might execute hcalls we need to guard against
 712  * recursion. One example of this are spinlocks calling H_YIELD on
 713  * shared processor partitions.
 714  */
 715 static DEFINE_PER_CPU(unsigned int, hcall_trace_depth);
 716
 717
 718 void __trace_hcall_entry(unsigned long opcode, unsigned long *args)
 719 {
 720         unsigned long flags;
 721         unsigned int *depth;
 722
 723         /*
 724          * We cannot call tracepoints inside RCU idle regions which
 725          * means we must not trace H_CEDE.
 726          */
 727         if (opcode == H_CEDE)
 728                 return;
 729
 730         local_irq_save(flags);
 731
 732         depth = this_cpu_ptr(&hcall_trace_depth);
 733
 734         if (*depth)
 735                 goto out;
 736
 737         (*depth)++;
 738         preempt_disable();
 739         trace_hcall_entry(opcode, args);
 740         (*depth)--;
 741
 742 out:
 743         local_irq_restore(flags);
 744 }
 745
 746 void __trace_hcall_exit(long opcode, unsigned long retval,
 747                         unsigned long *retbuf)
 748 {
 749         unsigned long flags;
 750         unsigned int *depth;
 751
 752         if (opcode == H_CEDE)
 753                 return;
 754
 755         local_irq_save(flags);
 756
 757         depth = this_cpu_ptr(&hcall_trace_depth);
 758
 759         if (*depth)
 760                 goto out;
 761
 762         (*depth)++;
 763         trace_hcall_exit(opcode, retval, retbuf);
 764         preempt_enable();
 765         (*depth)--;
 766
 767 out:
 768         local_irq_restore(flags);
 769 }
 770 #endif
 771
 772 /**
 773  * h_get_mpp
 774  * H_GET_MPP hcall returns info in 7 parms
 775  */
 776 int h_get_mpp(struct hvcall_mpp_data *mpp_data)
 777 {
 778         int rc;
 779         unsigned long retbuf[PLPAR_HCALL9_BUFSIZE];
 780
 781         rc = plpar_hcall9(H_GET_MPP, retbuf);
 782
 783         mpp_data->entitled_mem = retbuf[0];
 784         mpp_data->mapped_mem = retbuf[1];
 785
 786         mpp_data->group_num = (retbuf[2] >> 2 * 8) & 0xffff;
 787         mpp_data->pool_num = retbuf[2] & 0xffff;
 788
 789         mpp_data->mem_weight = (retbuf[3] >> 7 * 8) & 0xff;
 790         mpp_data->unallocated_mem_weight = (retbuf[3] >> 6 * 8) & 0xff;
 791         mpp_data->unallocated_entitlement = retbuf[3] & 0xffffffffffffUL;
 792
 793         mpp_data->pool_size = retbuf[4];
 794         mpp_data->loan_request = retbuf[5];
 795         mpp_data->backing_mem = retbuf[6];
 796
 797         return rc;
 798 }
 799 EXPORT_SYMBOL(h_get_mpp);
 800
 801 int h_get_mpp_x(struct hvcall_mpp_x_data *mpp_x_data)
 802 {
 803         int rc;
 804         unsigned long retbuf[PLPAR_HCALL9_BUFSIZE] = { 0 };
 805
 806         rc = plpar_hcall9(H_GET_MPP_X, retbuf);
 807
 808         mpp_x_data->coalesced_bytes = retbuf[0];
 809         mpp_x_data->pool_coalesced_bytes = retbuf[1];
 810         mpp_x_data->pool_purr_cycles = retbuf[2];
 811         mpp_x_data->pool_spurr_cycles = retbuf[3];
 812
 813         return rc;
 814 }