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/static_key.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/fadump.h>
  47
  48 #include "pseries.h"
  49
  50 /* Flag bits for H_BULK_REMOVE */
  51 #define HBR_REQUEST     0x4000000000000000UL
  52 #define HBR_RESPONSE    0x8000000000000000UL
  53 #define HBR_END         0xc000000000000000UL
  54 #define HBR_AVPN        0x0200000000000000UL
  55 #define HBR_ANDCOND     0x0100000000000000UL
  56
  57
  58 /* in hvCall.S */
  59 EXPORT_SYMBOL(plpar_hcall);
  60 EXPORT_SYMBOL(plpar_hcall9);
  61 EXPORT_SYMBOL(plpar_hcall_norets);
  62
  63 void vpa_init(int cpu)
  64 {
  65         int hwcpu = get_hard_smp_processor_id(cpu);
  66         unsigned long addr;
  67         long ret;
  68         struct paca_struct *pp;
  69         struct dtl_entry *dtl;
  70
  71         /*
  72          * The spec says it "may be problematic" if CPU x registers the VPA of
  73          * CPU y. We should never do that, but wail if we ever do.
  74          */
  75         WARN_ON(cpu != smp_processor_id());
  76
  77         if (cpu_has_feature(CPU_FTR_ALTIVEC))
  78                 lppaca_of(cpu).vmxregs_in_use = 1;
  79
  80         if (cpu_has_feature(CPU_FTR_ARCH_207S))
  81                 lppaca_of(cpu).ebb_regs_in_use = 1;
  82
  83         addr = __pa(&lppaca_of(cpu));
  84         ret = register_vpa(hwcpu, addr);
  85
  86         if (ret) {
  87                 pr_err("WARNING: VPA registration for cpu %d (hw %d) of area "
  88                        "%lx failed with %ld\n", cpu, hwcpu, addr, ret);
  89                 return;
  90         }
  91         /*
  92          * PAPR says this feature is SLB-Buffer but firmware never
  93          * reports that.  All SPLPAR support SLB shadow buffer.
  94          */
  95         addr = __pa(paca[cpu].slb_shadow_ptr);
  96         if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
  97                 ret = register_slb_shadow(hwcpu, addr);
  98                 if (ret)
  99                         pr_err("WARNING: SLB shadow buffer registration for "
 100                                "cpu %d (hw %d) of area %lx failed with %ld\n",
 101                                cpu, hwcpu, addr, ret);
 102         }
 103
 104         /*
 105          * Register dispatch trace log, if one has been allocated.
 106          */
 107         pp = &paca[cpu];
 108         dtl = pp->dispatch_log;
 109         if (dtl) {
 110                 pp->dtl_ridx = 0;
 111                 pp->dtl_curr = dtl;
 112                 lppaca_of(cpu).dtl_idx = 0;
 113
 114                 /* hypervisor reads buffer length from this field */
 115                 dtl->enqueue_to_dispatch_time = cpu_to_be32(DISPATCH_LOG_BYTES);
 116                 ret = register_dtl(hwcpu, __pa(dtl));
 117                 if (ret)
 118                         pr_err("WARNING: DTL registration of cpu %d (hw %d) "
 119                                "failed with %ld\n", smp_processor_id(),
 120                                hwcpu, ret);
 121                 lppaca_of(cpu).dtl_enable_mask = 2;
 122         }
 123 }
 124
 125 static long pSeries_lpar_hpte_insert(unsigned long hpte_group,
 126                                      unsigned long vpn, unsigned long pa,
 127                                      unsigned long rflags, unsigned long vflags,
 128                                      int psize, int apsize, int ssize)
 129 {
 130         unsigned long lpar_rc;
 131         unsigned long flags;
 132         unsigned long slot;
 133         unsigned long hpte_v, hpte_r;
 134
 135         if (!(vflags & HPTE_V_BOLTED))
 136                 pr_devel("hpte_insert(group=%lx, vpn=%016lx, "
 137                          "pa=%016lx, rflags=%lx, vflags=%lx, psize=%d)\n",
 138                          hpte_group, vpn,  pa, rflags, vflags, psize);
 139
 140         hpte_v = hpte_encode_v(vpn, psize, apsize, ssize) | vflags | HPTE_V_VALID;
 141         hpte_r = hpte_encode_r(pa, psize, apsize) | rflags;
 142
 143         if (!(vflags & HPTE_V_BOLTED))
 144                 pr_devel(" hpte_v=%016lx, hpte_r=%016lx\n", hpte_v, hpte_r);
 145
 146         /* Now fill in the actual HPTE */
 147         /* Set CEC cookie to 0         */
 148         /* Zero page = 0               */
 149         /* I-cache Invalidate = 0      */
 150         /* I-cache synchronize = 0     */
 151         /* Exact = 0                   */
 152         flags = 0;
 153
 154         /* Make pHyp happy */
 155         if ((rflags & _PAGE_NO_CACHE) && !(rflags & _PAGE_WRITETHRU))
 156                 hpte_r &= ~HPTE_R_M;
 157
 158         if (firmware_has_feature(FW_FEATURE_XCMO) && !(hpte_r & HPTE_R_N))
 159                 flags |= H_COALESCE_CAND;
 160
 161         lpar_rc = plpar_pte_enter(flags, hpte_group, hpte_v, hpte_r, &slot);
 162         if (unlikely(lpar_rc == H_PTEG_FULL)) {
 163                 if (!(vflags & HPTE_V_BOLTED))
 164                         pr_devel(" full\n");
 165                 return -1;
 166         }
 167
 168         /*
 169          * Since we try and ioremap PHBs we don't own, the pte insert
 170          * will fail. However we must catch the failure in hash_page
 171          * or we will loop forever, so return -2 in this case.
 172          */
 173         if (unlikely(lpar_rc != H_SUCCESS)) {
 174                 if (!(vflags & HPTE_V_BOLTED))
 175                         pr_devel(" lpar err %ld\n", lpar_rc);
 176                 return -2;
 177         }
 178         if (!(vflags & HPTE_V_BOLTED))
 179                 pr_devel(" -> slot: %lu\n", slot & 7);
 180
 181         /* Because of iSeries, we have to pass down the secondary
 182          * bucket bit here as well
 183          */
 184         return (slot & 7) | (!!(vflags & HPTE_V_SECONDARY) << 3);
 185 }
 186
 187 static DEFINE_SPINLOCK(pSeries_lpar_tlbie_lock);
 188
 189 static long pSeries_lpar_hpte_remove(unsigned long hpte_group)
 190 {
 191         unsigned long slot_offset;
 192         unsigned long lpar_rc;
 193         int i;
 194         unsigned long dummy1, dummy2;
 195
 196         /* pick a random slot to start at */
 197         slot_offset = mftb() & 0x7;
 198
 199         for (i = 0; i < HPTES_PER_GROUP; i++) {
 200
 201                 /* don't remove a bolted entry */
 202                 lpar_rc = plpar_pte_remove(H_ANDCOND, hpte_group + slot_offset,
 203                                            (0x1UL << 4), &dummy1, &dummy2);
 204                 if (lpar_rc == H_SUCCESS)
 205                         return i;
 206
 207                 /*
 208                  * The test for adjunct partition is performed before the
 209                  * ANDCOND test.  H_RESOURCE may be returned, so we need to
 210                  * check for that as well.
 211                  */
 212                 BUG_ON(lpar_rc != H_NOT_FOUND && lpar_rc != H_RESOURCE);
 213
 214                 slot_offset++;
 215                 slot_offset &= 0x7;
 216         }
 217
 218         return -1;
 219 }
 220
 221 static void pSeries_lpar_hptab_clear(void)
 222 {
 223         unsigned long size_bytes = 1UL << ppc64_pft_size;
 224         unsigned long hpte_count = size_bytes >> 4;
 225         struct {
 226                 unsigned long pteh;
 227                 unsigned long ptel;
 228         } ptes[4];
 229         long lpar_rc;
 230         unsigned long i, j;
 231
 232         /* Read in batches of 4,
 233          * invalidate only valid entries not in the VRMA
 234          * hpte_count will be a multiple of 4
 235          */
 236         for (i = 0; i < hpte_count; i += 4) {
 237                 lpar_rc = plpar_pte_read_4_raw(0, i, (void *)ptes);
 238                 if (lpar_rc != H_SUCCESS)
 239                         continue;
 240                 for (j = 0; j < 4; j++){
 241                         if ((ptes[j].pteh & HPTE_V_VRMA_MASK) ==
 242                                 HPTE_V_VRMA_MASK)
 243                                 continue;
 244                         if (ptes[j].pteh & HPTE_V_VALID)
 245                                 plpar_pte_remove_raw(0, i + j, 0,
 246                                         &(ptes[j].pteh), &(ptes[j].ptel));
 247                 }
 248         }
 249
 250 #ifdef __LITTLE_ENDIAN__
 251         /*
 252          * Reset exceptions to big endian.
 253          *
 254          * FIXME this is a hack for kexec, we need to reset the exception
 255          * endian before starting the new kernel and this is a convenient place
 256          * to do it.
 257          *
 258          * This is also called on boot when a fadump happens. In that case we
 259          * must not change the exception endian mode.
 260          */
 261         if (firmware_has_feature(FW_FEATURE_SET_MODE) && !is_fadump_active()) {
 262                 long rc;
 263
 264                 rc = pseries_big_endian_exceptions();
 265                 /*
 266                  * At this point it is unlikely panic() will get anything
 267                  * out to the user, but at least this will stop us from
 268                  * continuing on further and creating an even more
 269                  * difficult to debug situation.
 270                  */
 271                 if (rc)
 272                         panic("Could not enable big endian exceptions");
 273         }
 274 #endif
 275 }
 276
 277 /*
 278  * NOTE: for updatepp ops we are fortunate that the linux "newpp" bits and
 279  * the low 3 bits of flags happen to line up.  So no transform is needed.
 280  * We can probably optimize here and assume the high bits of newpp are
 281  * already zero.  For now I am paranoid.
 282  */
 283 static long pSeries_lpar_hpte_updatepp(unsigned long slot,
 284                                        unsigned long newpp,
 285                                        unsigned long vpn,
 286                                        int psize, int apsize,
 287                                        int ssize, unsigned long inv_flags)
 288 {
 289         unsigned long lpar_rc;
 290         unsigned long flags = (newpp & 7) | H_AVPN;
 291         unsigned long want_v;
 292
 293         want_v = hpte_encode_avpn(vpn, psize, ssize);
 294
 295         pr_devel("    update: avpnv=%016lx, hash=%016lx, f=%lx, psize: %d ...",
 296                  want_v, slot, flags, psize);
 297
 298         lpar_rc = plpar_pte_protect(flags, slot, want_v);
 299
 300         if (lpar_rc == H_NOT_FOUND) {
 301                 pr_devel("not found !\n");
 302                 return -1;
 303         }
 304
 305         pr_devel("ok\n");
 306
 307         BUG_ON(lpar_rc != H_SUCCESS);
 308
 309         return 0;
 310 }
 311
 312 static unsigned long pSeries_lpar_hpte_getword0(unsigned long slot)
 313 {
 314         unsigned long dword0;
 315         unsigned long lpar_rc;
 316         unsigned long dummy_word1;
 317         unsigned long flags;
 318
 319         /* Read 1 pte at a time                        */
 320         /* Do not need RPN to logical page translation */
 321         /* No cross CEC PFT access                     */
 322         flags = 0;
 323
 324         lpar_rc = plpar_pte_read(flags, slot, &dword0, &dummy_word1);
 325
 326         BUG_ON(lpar_rc != H_SUCCESS);
 327
 328         return dword0;
 329 }
 330
 331 static long pSeries_lpar_hpte_find(unsigned long vpn, int psize, int ssize)
 332 {
 333         unsigned long hash;
 334         unsigned long i;
 335         long slot;
 336         unsigned long want_v, hpte_v;
 337
 338         hash = hpt_hash(vpn, mmu_psize_defs[psize].shift, ssize);
 339         want_v = hpte_encode_avpn(vpn, psize, ssize);
 340
 341         /* Bolted entries are always in the primary group */
 342         slot = (hash & htab_hash_mask) * HPTES_PER_GROUP;
 343         for (i = 0; i < HPTES_PER_GROUP; i++) {
 344                 hpte_v = pSeries_lpar_hpte_getword0(slot);
 345
 346                 if (HPTE_V_COMPARE(hpte_v, want_v) && (hpte_v & HPTE_V_VALID))
 347                         /* HPTE matches */
 348                         return slot;
 349                 ++slot;
 350         }
 351
 352         return -1;
 353 }
 354
 355 static void pSeries_lpar_hpte_updateboltedpp(unsigned long newpp,
 356                                              unsigned long ea,
 357                                              int psize, int ssize)
 358 {
 359         unsigned long vpn;
 360         unsigned long lpar_rc, slot, vsid, flags;
 361
 362         vsid = get_kernel_vsid(ea, ssize);
 363         vpn = hpt_vpn(ea, vsid, ssize);
 364
 365         slot = pSeries_lpar_hpte_find(vpn, psize, ssize);
 366         BUG_ON(slot == -1);
 367
 368         flags = newpp & 7;
 369         lpar_rc = plpar_pte_protect(flags, slot, 0);
 370
 371         BUG_ON(lpar_rc != H_SUCCESS);
 372 }
 373
 374 static void pSeries_lpar_hpte_invalidate(unsigned long slot, unsigned long vpn,
 375                                          int psize, int apsize,
 376                                          int ssize, int local)
 377 {
 378         unsigned long want_v;
 379         unsigned long lpar_rc;
 380         unsigned long dummy1, dummy2;
 381
 382         pr_devel("    inval : slot=%lx, vpn=%016lx, psize: %d, local: %d\n",
 383                  slot, vpn, psize, local);
 384
 385         want_v = hpte_encode_avpn(vpn, psize, ssize);
 386         lpar_rc = plpar_pte_remove(H_AVPN, slot, want_v, &dummy1, &dummy2);
 387         if (lpar_rc == H_NOT_FOUND)
 388                 return;
 389
 390         BUG_ON(lpar_rc != H_SUCCESS);
 391 }
 392
 393 /*
 394  * Limit iterations holding pSeries_lpar_tlbie_lock to 3. We also need
 395  * to make sure that we avoid bouncing the hypervisor tlbie lock.
 396  */
 397 #define PPC64_HUGE_HPTE_BATCH 12
 398
 399 static void __pSeries_lpar_hugepage_invalidate(unsigned long *slot,
 400                                              unsigned long *vpn, int count,
 401                                              int psize, int ssize)
 402 {
 403         unsigned long param[8];
 404         int i = 0, pix = 0, rc;
 405         unsigned long flags = 0;
 406         int lock_tlbie = !mmu_has_feature(MMU_FTR_LOCKLESS_TLBIE);
 407
 408         if (lock_tlbie)
 409                 spin_lock_irqsave(&pSeries_lpar_tlbie_lock, flags);
 410
 411         for (i = 0; i < count; i++) {
 412
 413                 if (!firmware_has_feature(FW_FEATURE_BULK_REMOVE)) {
 414                         pSeries_lpar_hpte_invalidate(slot[i], vpn[i], psize, 0,
 415                                                      ssize, 0);
 416                 } else {
 417                         param[pix] = HBR_REQUEST | HBR_AVPN | slot[i];
 418                         param[pix+1] = hpte_encode_avpn(vpn[i], psize, ssize);
 419                         pix += 2;
 420                         if (pix == 8) {
 421                                 rc = plpar_hcall9(H_BULK_REMOVE, param,
 422                                                   param[0], param[1], param[2],
 423                                                   param[3], param[4], param[5],
 424                                                   param[6], param[7]);
 425                                 BUG_ON(rc != H_SUCCESS);
 426                                 pix = 0;
 427                         }
 428                 }
 429         }
 430         if (pix) {
 431                 param[pix] = HBR_END;
 432                 rc = plpar_hcall9(H_BULK_REMOVE, param, param[0], param[1],
 433                                   param[2], param[3], param[4], param[5],
 434                                   param[6], param[7]);
 435                 BUG_ON(rc != H_SUCCESS);
 436         }
 437
 438         if (lock_tlbie)
 439                 spin_unlock_irqrestore(&pSeries_lpar_tlbie_lock, flags);
 440 }
 441
 442 static void pSeries_lpar_hugepage_invalidate(unsigned long vsid,
 443                                              unsigned long addr,
 444                                              unsigned char *hpte_slot_array,
 445                                              int psize, int ssize, int local)
 446 {
 447         int i, index = 0;
 448         unsigned long s_addr = addr;
 449         unsigned int max_hpte_count, valid;
 450         unsigned long vpn_array[PPC64_HUGE_HPTE_BATCH];
 451         unsigned long slot_array[PPC64_HUGE_HPTE_BATCH];
 452         unsigned long shift, hidx, vpn = 0, hash, slot;
 453
 454         shift = mmu_psize_defs[psize].shift;
 455         max_hpte_count = 1U << (PMD_SHIFT - shift);
 456
 457         for (i = 0; i < max_hpte_count; i++) {
 458                 valid = hpte_valid(hpte_slot_array, i);
 459                 if (!valid)
 460                         continue;
 461                 hidx =  hpte_hash_index(hpte_slot_array, i);
 462
 463                 /* get the vpn */
 464                 addr = s_addr + (i * (1ul << shift));
 465                 vpn = hpt_vpn(addr, vsid, ssize);
 466                 hash = hpt_hash(vpn, shift, ssize);
 467                 if (hidx & _PTEIDX_SECONDARY)
 468                         hash = ~hash;
 469
 470                 slot = (hash & htab_hash_mask) * HPTES_PER_GROUP;
 471                 slot += hidx & _PTEIDX_GROUP_IX;
 472
 473                 slot_array[index] = slot;
 474                 vpn_array[index] = vpn;
 475                 if (index == PPC64_HUGE_HPTE_BATCH - 1) {
 476                         /*
 477                          * Now do a bluk invalidate
 478                          */
 479                         __pSeries_lpar_hugepage_invalidate(slot_array,
 480                                                            vpn_array,
 481                                                            PPC64_HUGE_HPTE_BATCH,
 482                                                            psize, ssize);
 483                         index = 0;
 484                 } else
 485                         index++;
 486         }
 487         if (index)
 488                 __pSeries_lpar_hugepage_invalidate(slot_array, vpn_array,
 489                                                    index, psize, ssize);
 490 }
 491
 492 static void pSeries_lpar_hpte_removebolted(unsigned long ea,
 493                                            int psize, int ssize)
 494 {
 495         unsigned long vpn;
 496         unsigned long slot, vsid;
 497
 498         vsid = get_kernel_vsid(ea, ssize);
 499         vpn = hpt_vpn(ea, vsid, ssize);
 500
 501         slot = pSeries_lpar_hpte_find(vpn, psize, ssize);
 502         BUG_ON(slot == -1);
 503         /*
 504          * lpar doesn't use the passed actual page size
 505          */
 506         pSeries_lpar_hpte_invalidate(slot, vpn, psize, 0, ssize, 0);
 507 }
 508
 509 /*
 510  * Take a spinlock around flushes to avoid bouncing the hypervisor tlbie
 511  * lock.
 512  */
 513 static void pSeries_lpar_flush_hash_range(unsigned long number, int local)
 514 {
 515         unsigned long vpn;
 516         unsigned long i, pix, rc;
 517         unsigned long flags = 0;
 518         struct ppc64_tlb_batch *batch = this_cpu_ptr(&ppc64_tlb_batch);
 519         int lock_tlbie = !mmu_has_feature(MMU_FTR_LOCKLESS_TLBIE);
 520         unsigned long param[9];
 521         unsigned long hash, index, shift, hidx, slot;
 522         real_pte_t pte;
 523         int psize, ssize;
 524
 525         if (lock_tlbie)
 526                 spin_lock_irqsave(&pSeries_lpar_tlbie_lock, flags);
 527
 528         psize = batch->psize;
 529         ssize = batch->ssize;
 530         pix = 0;
 531         for (i = 0; i < number; i++) {
 532                 vpn = batch->vpn[i];
 533                 pte = batch->pte[i];
 534                 pte_iterate_hashed_subpages(pte, psize, vpn, index, shift) {
 535                         hash = hpt_hash(vpn, shift, ssize);
 536                         hidx = __rpte_to_hidx(pte, index);
 537                         if (hidx & _PTEIDX_SECONDARY)
 538                                 hash = ~hash;
 539                         slot = (hash & htab_hash_mask) * HPTES_PER_GROUP;
 540                         slot += hidx & _PTEIDX_GROUP_IX;
 541                         if (!firmware_has_feature(FW_FEATURE_BULK_REMOVE)) {
 542                                 /*
 543                                  * lpar doesn't use the passed actual page size
 544                                  */
 545                                 pSeries_lpar_hpte_invalidate(slot, vpn, psize,
 546                                                              0, ssize, local);
 547                         } else {
 548                                 param[pix] = HBR_REQUEST | HBR_AVPN | slot;
 549                                 param[pix+1] = hpte_encode_avpn(vpn, psize,
 550                                                                 ssize);
 551                                 pix += 2;
 552                                 if (pix == 8) {
 553                                         rc = plpar_hcall9(H_BULK_REMOVE, param,
 554                                                 param[0], param[1], param[2],
 555                                                 param[3], param[4], param[5],
 556                                                 param[6], param[7]);
 557                                         BUG_ON(rc != H_SUCCESS);
 558                                         pix = 0;
 559                                 }
 560                         }
 561                 } pte_iterate_hashed_end();
 562         }
 563         if (pix) {
 564                 param[pix] = HBR_END;
 565                 rc = plpar_hcall9(H_BULK_REMOVE, param, param[0], param[1],
 566                                   param[2], param[3], param[4], param[5],
 567                                   param[6], param[7]);
 568                 BUG_ON(rc != H_SUCCESS);
 569         }
 570
 571         if (lock_tlbie)
 572                 spin_unlock_irqrestore(&pSeries_lpar_tlbie_lock, flags);
 573 }
 574
 575 static int __init disable_bulk_remove(char *str)
 576 {
 577         if (strcmp(str, "off") == 0 &&
 578             firmware_has_feature(FW_FEATURE_BULK_REMOVE)) {
 579                         printk(KERN_INFO "Disabling BULK_REMOVE firmware feature");
 580                         powerpc_firmware_features &= ~FW_FEATURE_BULK_REMOVE;
 581         }
 582         return 1;
 583 }
 584
 585 __setup("bulk_remove=", disable_bulk_remove);
 586
 587 void __init hpte_init_lpar(void)
 588 {
 589         ppc_md.hpte_invalidate  = pSeries_lpar_hpte_invalidate;
 590         ppc_md.hpte_updatepp    = pSeries_lpar_hpte_updatepp;
 591         ppc_md.hpte_updateboltedpp = pSeries_lpar_hpte_updateboltedpp;
 592         ppc_md.hpte_insert      = pSeries_lpar_hpte_insert;
 593         ppc_md.hpte_remove      = pSeries_lpar_hpte_remove;
 594         ppc_md.hpte_removebolted = pSeries_lpar_hpte_removebolted;
 595         ppc_md.flush_hash_range = pSeries_lpar_flush_hash_range;
 596         ppc_md.hpte_clear_all   = pSeries_lpar_hptab_clear;
 597         ppc_md.hugepage_invalidate = pSeries_lpar_hugepage_invalidate;
 598 }
 599
 600 #ifdef CONFIG_PPC_SMLPAR
 601 #define CMO_FREE_HINT_DEFAULT 1
 602 static int cmo_free_hint_flag = CMO_FREE_HINT_DEFAULT;
 603
 604 static int __init cmo_free_hint(char *str)
 605 {
 606         char *parm;
 607         parm = strstrip(str);
 608
 609         if (strcasecmp(parm, "no") == 0 || strcasecmp(parm, "off") == 0) {
 610                 printk(KERN_INFO "cmo_free_hint: CMO free page hinting is not active.\n");
 611                 cmo_free_hint_flag = 0;
 612                 return 1;
 613         }
 614
 615         cmo_free_hint_flag = 1;
 616         printk(KERN_INFO "cmo_free_hint: CMO free page hinting is active.\n");
 617
 618         if (strcasecmp(parm, "yes") == 0 || strcasecmp(parm, "on") == 0)
 619                 return 1;
 620
 621         return 0;
 622 }
 623
 624 __setup("cmo_free_hint=", cmo_free_hint);
 625
 626 static void pSeries_set_page_state(struct page *page, int order,
 627                                    unsigned long state)
 628 {
 629         int i, j;
 630         unsigned long cmo_page_sz, addr;
 631
 632         cmo_page_sz = cmo_get_page_size();
 633         addr = __pa((unsigned long)page_address(page));
 634
 635         for (i = 0; i < (1 << order); i++, addr += PAGE_SIZE) {
 636                 for (j = 0; j < PAGE_SIZE; j += cmo_page_sz)
 637                         plpar_hcall_norets(H_PAGE_INIT, state, addr + j, 0);
 638         }
 639 }
 640
 641 void arch_free_page(struct page *page, int order)
 642 {
 643         if (!cmo_free_hint_flag || !firmware_has_feature(FW_FEATURE_CMO))
 644                 return;
 645
 646         pSeries_set_page_state(page, order, H_PAGE_SET_UNUSED);
 647 }
 648 EXPORT_SYMBOL(arch_free_page);
 649
 650 #endif
 651
 652 #ifdef CONFIG_TRACEPOINTS
 653 #ifdef HAVE_JUMP_LABEL
 654 struct static_key hcall_tracepoint_key = STATIC_KEY_INIT;
 655
 656 void hcall_tracepoint_regfunc(void)
 657 {
 658         static_key_slow_inc(&hcall_tracepoint_key);
 659 }
 660
 661 void hcall_tracepoint_unregfunc(void)
 662 {
 663         static_key_slow_dec(&hcall_tracepoint_key);
 664 }
 665 #else
 666 /*
 667  * We optimise our hcall path by placing hcall_tracepoint_refcount
 668  * directly in the TOC so we can check if the hcall tracepoints are
 669  * enabled via a single load.
 670  */
 671
 672 /* NB: reg/unreg are called while guarded with the tracepoints_mutex */
 673 extern long hcall_tracepoint_refcount;
 674
 675 void hcall_tracepoint_regfunc(void)
 676 {
 677         hcall_tracepoint_refcount++;
 678 }
 679
 680 void hcall_tracepoint_unregfunc(void)
 681 {
 682         hcall_tracepoint_refcount--;
 683 }
 684 #endif
 685
 686 /*
 687  * Since the tracing code might execute hcalls we need to guard against
 688  * recursion. One example of this are spinlocks calling H_YIELD on
 689  * shared processor partitions.
 690  */
 691 static DEFINE_PER_CPU(unsigned int, hcall_trace_depth);
 692
 693
 694 void __trace_hcall_entry(unsigned long opcode, unsigned long *args)
 695 {
 696         unsigned long flags;
 697         unsigned int *depth;
 698
 699         /*
 700          * We cannot call tracepoints inside RCU idle regions which
 701          * means we must not trace H_CEDE.
 702          */
 703         if (opcode == H_CEDE)
 704                 return;
 705
 706         local_irq_save(flags);
 707
 708         depth = this_cpu_ptr(&hcall_trace_depth);
 709
 710         if (*depth)
 711                 goto out;
 712
 713         (*depth)++;
 714         preempt_disable();
 715         trace_hcall_entry(opcode, args);
 716         (*depth)--;
 717
 718 out:
 719         local_irq_restore(flags);
 720 }
 721
 722 void __trace_hcall_exit(long opcode, unsigned long retval,
 723                         unsigned long *retbuf)
 724 {
 725         unsigned long flags;
 726         unsigned int *depth;
 727
 728         if (opcode == H_CEDE)
 729                 return;
 730
 731         local_irq_save(flags);
 732
 733         depth = this_cpu_ptr(&hcall_trace_depth);
 734
 735         if (*depth)
 736                 goto out;
 737
 738         (*depth)++;
 739         trace_hcall_exit(opcode, retval, retbuf);
 740         preempt_enable();
 741         (*depth)--;
 742
 743 out:
 744         local_irq_restore(flags);
 745 }
 746 #endif
 747
 748 /**
 749  * h_get_mpp
 750  * H_GET_MPP hcall returns info in 7 parms
 751  */
 752 int h_get_mpp(struct hvcall_mpp_data *mpp_data)
 753 {
 754         int rc;
 755         unsigned long retbuf[PLPAR_HCALL9_BUFSIZE];
 756
 757         rc = plpar_hcall9(H_GET_MPP, retbuf);
 758
 759         mpp_data->entitled_mem = retbuf[0];
 760         mpp_data->mapped_mem = retbuf[1];
 761
 762         mpp_data->group_num = (retbuf[2] >> 2 * 8) & 0xffff;
 763         mpp_data->pool_num = retbuf[2] & 0xffff;
 764
 765         mpp_data->mem_weight = (retbuf[3] >> 7 * 8) & 0xff;
 766         mpp_data->unallocated_mem_weight = (retbuf[3] >> 6 * 8) & 0xff;
 767         mpp_data->unallocated_entitlement = retbuf[3] & 0xffffffffffffUL;
 768
 769         mpp_data->pool_size = retbuf[4];
 770         mpp_data->loan_request = retbuf[5];
 771         mpp_data->backing_mem = retbuf[6];
 772
 773         return rc;
 774 }
 775 EXPORT_SYMBOL(h_get_mpp);
 776
 777 int h_get_mpp_x(struct hvcall_mpp_x_data *mpp_x_data)
 778 {
 779         int rc;
 780         unsigned long retbuf[PLPAR_HCALL9_BUFSIZE] = { 0 };
 781
 782         rc = plpar_hcall9(H_GET_MPP_X, retbuf);
 783
 784         mpp_x_data->coalesced_bytes = retbuf[0];
 785         mpp_x_data->pool_coalesced_bytes = retbuf[1];
 786         mpp_x_data->pool_purr_cycles = retbuf[2];
 787         mpp_x_data->pool_spurr_cycles = retbuf[3];
 788
 789         return rc;
 790 }