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 <asm/processor.h>
  30 #include <asm/mmu.h>
  31 #include <asm/page.h>
  32 #include <asm/pgtable.h>
  33 #include <asm/machdep.h>
  34 #include <asm/mmu_context.h>
  35 #include <asm/iommu.h>
  36 #include <asm/tlbflush.h>
  37 #include <asm/tlb.h>
  38 #include <asm/prom.h>
  39 #include <asm/cputable.h>
  40 #include <asm/udbg.h>
  41 #include <asm/smp.h>
  42 #include <asm/trace.h>
  43 #include <asm/firmware.h>
  44
  45 #include "plpar_wrappers.h"
  46 #include "pseries.h"
  47
  48 /* Flag bits for H_BULK_REMOVE */
  49 #define HBR_REQUEST     0x4000000000000000UL
  50 #define HBR_RESPONSE    0x8000000000000000UL
  51 #define HBR_END         0xc000000000000000UL
  52 #define HBR_AVPN        0x0200000000000000UL
  53 #define HBR_ANDCOND     0x0100000000000000UL
  54
  55
  56 /* in hvCall.S */
  57 EXPORT_SYMBOL(plpar_hcall);
  58 EXPORT_SYMBOL(plpar_hcall9);
  59 EXPORT_SYMBOL(plpar_hcall_norets);
  60
  61 extern void pSeries_find_serial_port(void);
  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         if (cpu_has_feature(CPU_FTR_ALTIVEC))
  72                 lppaca_of(cpu).vmxregs_in_use = 1;
  73
  74         addr = __pa(&lppaca_of(cpu));
  75         ret = register_vpa(hwcpu, addr);
  76
  77         if (ret) {
  78                 pr_err("WARNING: VPA registration for cpu %d (hw %d) of area "
  79                        "%lx failed with %ld\n", cpu, hwcpu, addr, ret);
  80                 return;
  81         }
  82         /*
  83          * PAPR says this feature is SLB-Buffer but firmware never
  84          * reports that.  All SPLPAR support SLB shadow buffer.
  85          */
  86         addr = __pa(&slb_shadow[cpu]);
  87         if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
  88                 ret = register_slb_shadow(hwcpu, addr);
  89                 if (ret)
  90                         pr_err("WARNING: SLB shadow buffer registration for "
  91                                "cpu %d (hw %d) of area %lx failed with %ld\n",
  92                                cpu, hwcpu, addr, ret);
  93         }
  94
  95         /*
  96          * Register dispatch trace log, if one has been allocated.
  97          */
  98         pp = &paca[cpu];
  99         dtl = pp->dispatch_log;
 100         if (dtl) {
 101                 pp->dtl_ridx = 0;
 102                 pp->dtl_curr = dtl;
 103                 lppaca_of(cpu).dtl_idx = 0;
 104
 105                 /* hypervisor reads buffer length from this field */
 106                 dtl->enqueue_to_dispatch_time = DISPATCH_LOG_BYTES;
 107                 ret = register_dtl(hwcpu, __pa(dtl));
 108                 if (ret)
 109                         pr_err("WARNING: DTL registration of cpu %d (hw %d) "
 110                                "failed with %ld\n", smp_processor_id(),
 111                                hwcpu, ret);
 112                 lppaca_of(cpu).dtl_enable_mask = 2;
 113         }
 114 }
 115
 116 static long pSeries_lpar_hpte_insert(unsigned long hpte_group,
 117                                      unsigned long vpn, unsigned long pa,
 118                                      unsigned long rflags, unsigned long vflags,
 119                                      int psize, int apsize, int ssize)
 120 {
 121         unsigned long lpar_rc;
 122         unsigned long flags;
 123         unsigned long slot;
 124         unsigned long hpte_v, hpte_r;
 125
 126         if (!(vflags & HPTE_V_BOLTED))
 127                 pr_devel("hpte_insert(group=%lx, vpn=%016lx, "
 128                          "pa=%016lx, rflags=%lx, vflags=%lx, psize=%d)\n",
 129                          hpte_group, vpn,  pa, rflags, vflags, psize);
 130
 131         hpte_v = hpte_encode_v(vpn, psize, apsize, ssize) | vflags | HPTE_V_VALID;
 132         hpte_r = hpte_encode_r(pa, psize, apsize) | rflags;
 133
 134         if (!(vflags & HPTE_V_BOLTED))
 135                 pr_devel(" hpte_v=%016lx, hpte_r=%016lx\n", hpte_v, hpte_r);
 136
 137         /* Now fill in the actual HPTE */
 138         /* Set CEC cookie to 0         */
 139         /* Zero page = 0               */
 140         /* I-cache Invalidate = 0      */
 141         /* I-cache synchronize = 0     */
 142         /* Exact = 0                   */
 143         flags = 0;
 144
 145         /* Make pHyp happy */
 146         if ((rflags & _PAGE_NO_CACHE) & !(rflags & _PAGE_WRITETHRU))
 147                 hpte_r &= ~_PAGE_COHERENT;
 148         if (firmware_has_feature(FW_FEATURE_XCMO) && !(hpte_r & HPTE_R_N))
 149                 flags |= H_COALESCE_CAND;
 150
 151         lpar_rc = plpar_pte_enter(flags, hpte_group, hpte_v, hpte_r, &slot);
 152         if (unlikely(lpar_rc == H_PTEG_FULL)) {
 153                 if (!(vflags & HPTE_V_BOLTED))
 154                         pr_devel(" full\n");
 155                 return -1;
 156         }
 157
 158         /*
 159          * Since we try and ioremap PHBs we don't own, the pte insert
 160          * will fail. However we must catch the failure in hash_page
 161          * or we will loop forever, so return -2 in this case.
 162          */
 163         if (unlikely(lpar_rc != H_SUCCESS)) {
 164                 if (!(vflags & HPTE_V_BOLTED))
 165                         pr_devel(" lpar err %ld\n", lpar_rc);
 166                 return -2;
 167         }
 168         if (!(vflags & HPTE_V_BOLTED))
 169                 pr_devel(" -> slot: %lu\n", slot & 7);
 170
 171         /* Because of iSeries, we have to pass down the secondary
 172          * bucket bit here as well
 173          */
 174         return (slot & 7) | (!!(vflags & HPTE_V_SECONDARY) << 3);
 175 }
 176
 177 static DEFINE_SPINLOCK(pSeries_lpar_tlbie_lock);
 178
 179 static long pSeries_lpar_hpte_remove(unsigned long hpte_group)
 180 {
 181         unsigned long slot_offset;
 182         unsigned long lpar_rc;
 183         int i;
 184         unsigned long dummy1, dummy2;
 185
 186         /* pick a random slot to start at */
 187         slot_offset = mftb() & 0x7;
 188
 189         for (i = 0; i < HPTES_PER_GROUP; i++) {
 190
 191                 /* don't remove a bolted entry */
 192                 lpar_rc = plpar_pte_remove(H_ANDCOND, hpte_group + slot_offset,
 193                                            (0x1UL << 4), &dummy1, &dummy2);
 194                 if (lpar_rc == H_SUCCESS)
 195                         return i;
 196
 197                 /*
 198                  * The test for adjunct partition is performed before the
 199                  * ANDCOND test.  H_RESOURCE may be returned, so we need to
 200                  * check for that as well.
 201                  */
 202                 BUG_ON(lpar_rc != H_NOT_FOUND && lpar_rc != H_RESOURCE);
 203
 204                 slot_offset++;
 205                 slot_offset &= 0x7;
 206         }
 207
 208         return -1;
 209 }
 210
 211 static void pSeries_lpar_hptab_clear(void)
 212 {
 213         unsigned long size_bytes = 1UL << ppc64_pft_size;
 214         unsigned long hpte_count = size_bytes >> 4;
 215         struct {
 216                 unsigned long pteh;
 217                 unsigned long ptel;
 218         } ptes[4];
 219         long lpar_rc;
 220         unsigned long i, j;
 221
 222         /* Read in batches of 4,
 223          * invalidate only valid entries not in the VRMA
 224          * hpte_count will be a multiple of 4
 225          */
 226         for (i = 0; i < hpte_count; i += 4) {
 227                 lpar_rc = plpar_pte_read_4_raw(0, i, (void *)ptes);
 228                 if (lpar_rc != H_SUCCESS)
 229                         continue;
 230                 for (j = 0; j < 4; j++){
 231                         if ((ptes[j].pteh & HPTE_V_VRMA_MASK) ==
 232                                 HPTE_V_VRMA_MASK)
 233                                 continue;
 234                         if (ptes[j].pteh & HPTE_V_VALID)
 235                                 plpar_pte_remove_raw(0, i + j, 0,
 236                                         &(ptes[j].pteh), &(ptes[j].ptel));
 237                 }
 238         }
 239 }
 240
 241 /*
 242  * NOTE: for updatepp ops we are fortunate that the linux "newpp" bits and
 243  * the low 3 bits of flags happen to line up.  So no transform is needed.
 244  * We can probably optimize here and assume the high bits of newpp are
 245  * already zero.  For now I am paranoid.
 246  */
 247 static long pSeries_lpar_hpte_updatepp(unsigned long slot,
 248                                        unsigned long newpp,
 249                                        unsigned long vpn,
 250                                        int psize, int apsize,
 251                                        int ssize, int local)
 252 {
 253         unsigned long lpar_rc;
 254         unsigned long flags = (newpp & 7) | H_AVPN;
 255         unsigned long want_v;
 256
 257         want_v = hpte_encode_avpn(vpn, psize, ssize);
 258
 259         pr_devel("    update: avpnv=%016lx, hash=%016lx, f=%lx, psize: %d ...",
 260                  want_v, slot, flags, psize);
 261
 262         lpar_rc = plpar_pte_protect(flags, slot, want_v);
 263
 264         if (lpar_rc == H_NOT_FOUND) {
 265                 pr_devel("not found !\n");
 266                 return -1;
 267         }
 268
 269         pr_devel("ok\n");
 270
 271         BUG_ON(lpar_rc != H_SUCCESS);
 272
 273         return 0;
 274 }
 275
 276 static unsigned long pSeries_lpar_hpte_getword0(unsigned long slot)
 277 {
 278         unsigned long dword0;
 279         unsigned long lpar_rc;
 280         unsigned long dummy_word1;
 281         unsigned long flags;
 282
 283         /* Read 1 pte at a time                        */
 284         /* Do not need RPN to logical page translation */
 285         /* No cross CEC PFT access                     */
 286         flags = 0;
 287
 288         lpar_rc = plpar_pte_read(flags, slot, &dword0, &dummy_word1);
 289
 290         BUG_ON(lpar_rc != H_SUCCESS);
 291
 292         return dword0;
 293 }
 294
 295 static long pSeries_lpar_hpte_find(unsigned long vpn, int psize, int ssize)
 296 {
 297         unsigned long hash;
 298         unsigned long i;
 299         long slot;
 300         unsigned long want_v, hpte_v;
 301
 302         hash = hpt_hash(vpn, mmu_psize_defs[psize].shift, ssize);
 303         want_v = hpte_encode_avpn(vpn, psize, ssize);
 304
 305         /* Bolted entries are always in the primary group */
 306         slot = (hash & htab_hash_mask) * HPTES_PER_GROUP;
 307         for (i = 0; i < HPTES_PER_GROUP; i++) {
 308                 hpte_v = pSeries_lpar_hpte_getword0(slot);
 309
 310                 if (HPTE_V_COMPARE(hpte_v, want_v) && (hpte_v & HPTE_V_VALID))
 311                         /* HPTE matches */
 312                         return slot;
 313                 ++slot;
 314         }
 315
 316         return -1;
 317 }
 318
 319 static void pSeries_lpar_hpte_updateboltedpp(unsigned long newpp,
 320                                              unsigned long ea,
 321                                              int psize, int ssize)
 322 {
 323         unsigned long vpn;
 324         unsigned long lpar_rc, slot, vsid, flags;
 325
 326         vsid = get_kernel_vsid(ea, ssize);
 327         vpn = hpt_vpn(ea, vsid, ssize);
 328
 329         slot = pSeries_lpar_hpte_find(vpn, psize, ssize);
 330         BUG_ON(slot == -1);
 331
 332         flags = newpp & 7;
 333         lpar_rc = plpar_pte_protect(flags, slot, 0);
 334
 335         BUG_ON(lpar_rc != H_SUCCESS);
 336 }
 337
 338 static void pSeries_lpar_hpte_invalidate(unsigned long slot, unsigned long vpn,
 339                                          int psize, int apsize,
 340                                          int ssize, int local)
 341 {
 342         unsigned long want_v;
 343         unsigned long lpar_rc;
 344         unsigned long dummy1, dummy2;
 345
 346         pr_devel("    inval : slot=%lx, vpn=%016lx, psize: %d, local: %d\n",
 347                  slot, vpn, psize, local);
 348
 349         want_v = hpte_encode_avpn(vpn, psize, ssize);
 350         lpar_rc = plpar_pte_remove(H_AVPN, slot, want_v, &dummy1, &dummy2);
 351         if (lpar_rc == H_NOT_FOUND)
 352                 return;
 353
 354         BUG_ON(lpar_rc != H_SUCCESS);
 355 }
 356
 357 /*
 358  * Limit iterations holding pSeries_lpar_tlbie_lock to 3. We also need
 359  * to make sure that we avoid bouncing the hypervisor tlbie lock.
 360  */
 361 #define PPC64_HUGE_HPTE_BATCH 12
 362
 363 static void __pSeries_lpar_hugepage_invalidate(unsigned long *slot,
 364                                              unsigned long *vpn, int count,
 365                                              int psize, int ssize)
 366 {
 367         unsigned long param[8];
 368         int i = 0, pix = 0, rc;
 369         unsigned long flags = 0;
 370         int lock_tlbie = !mmu_has_feature(MMU_FTR_LOCKLESS_TLBIE);
 371
 372         if (lock_tlbie)
 373                 spin_lock_irqsave(&pSeries_lpar_tlbie_lock, flags);
 374
 375         for (i = 0; i < count; i++) {
 376
 377                 if (!firmware_has_feature(FW_FEATURE_BULK_REMOVE)) {
 378                         pSeries_lpar_hpte_invalidate(slot[i], vpn[i], psize, 0,
 379                                                      ssize, 0);
 380                 } else {
 381                         param[pix] = HBR_REQUEST | HBR_AVPN | slot[i];
 382                         param[pix+1] = hpte_encode_avpn(vpn[i], psize, ssize);
 383                         pix += 2;
 384                         if (pix == 8) {
 385                                 rc = plpar_hcall9(H_BULK_REMOVE, param,
 386                                                   param[0], param[1], param[2],
 387                                                   param[3], param[4], param[5],
 388                                                   param[6], param[7]);
 389                                 BUG_ON(rc != H_SUCCESS);
 390                                 pix = 0;
 391                         }
 392                 }
 393         }
 394         if (pix) {
 395                 param[pix] = HBR_END;
 396                 rc = plpar_hcall9(H_BULK_REMOVE, param, param[0], param[1],
 397                                   param[2], param[3], param[4], param[5],
 398                                   param[6], param[7]);
 399                 BUG_ON(rc != H_SUCCESS);
 400         }
 401
 402         if (lock_tlbie)
 403                 spin_unlock_irqrestore(&pSeries_lpar_tlbie_lock, flags);
 404 }
 405
 406 static void pSeries_lpar_hugepage_invalidate(struct mm_struct *mm,
 407                                        unsigned char *hpte_slot_array,
 408                                        unsigned long addr, int psize)
 409 {
 410         int ssize = 0, i, index = 0;
 411         unsigned long s_addr = addr;
 412         unsigned int max_hpte_count, valid;
 413         unsigned long vpn_array[PPC64_HUGE_HPTE_BATCH];
 414         unsigned long slot_array[PPC64_HUGE_HPTE_BATCH];
 415         unsigned long shift, hidx, vpn = 0, vsid, hash, slot;
 416
 417         shift = mmu_psize_defs[psize].shift;
 418         max_hpte_count = 1U << (PMD_SHIFT - shift);
 419
 420         for (i = 0; i < max_hpte_count; i++) {
 421                 valid = hpte_valid(hpte_slot_array, i);
 422                 if (!valid)
 423                         continue;
 424                 hidx =  hpte_hash_index(hpte_slot_array, i);
 425
 426                 /* get the vpn */
 427                 addr = s_addr + (i * (1ul << shift));
 428                 if (!is_kernel_addr(addr)) {
 429                         ssize = user_segment_size(addr);
 430                         vsid = get_vsid(mm->context.id, addr, ssize);
 431                         WARN_ON(vsid == 0);
 432                 } else {
 433                         vsid = get_kernel_vsid(addr, mmu_kernel_ssize);
 434                         ssize = mmu_kernel_ssize;
 435                 }
 436
 437                 vpn = hpt_vpn(addr, vsid, ssize);
 438                 hash = hpt_hash(vpn, shift, ssize);
 439                 if (hidx & _PTEIDX_SECONDARY)
 440                         hash = ~hash;
 441
 442                 slot = (hash & htab_hash_mask) * HPTES_PER_GROUP;
 443                 slot += hidx & _PTEIDX_GROUP_IX;
 444
 445                 slot_array[index] = slot;
 446                 vpn_array[index] = vpn;
 447                 if (index == PPC64_HUGE_HPTE_BATCH - 1) {
 448                         /*
 449                          * Now do a bluk invalidate
 450                          */
 451                         __pSeries_lpar_hugepage_invalidate(slot_array,
 452                                                            vpn_array,
 453                                                            PPC64_HUGE_HPTE_BATCH,
 454                                                            psize, ssize);
 455                         index = 0;
 456                 } else
 457                         index++;
 458         }
 459         if (index)
 460                 __pSeries_lpar_hugepage_invalidate(slot_array, vpn_array,
 461                                                    index, psize, ssize);
 462 }
 463
 464 static void pSeries_lpar_hpte_removebolted(unsigned long ea,
 465                                            int psize, int ssize)
 466 {
 467         unsigned long vpn;
 468         unsigned long slot, vsid;
 469
 470         vsid = get_kernel_vsid(ea, ssize);
 471         vpn = hpt_vpn(ea, vsid, ssize);
 472
 473         slot = pSeries_lpar_hpte_find(vpn, psize, ssize);
 474         BUG_ON(slot == -1);
 475         /*
 476          * lpar doesn't use the passed actual page size
 477          */
 478         pSeries_lpar_hpte_invalidate(slot, vpn, psize, 0, ssize, 0);
 479 }
 480
 481 /*
 482  * Take a spinlock around flushes to avoid bouncing the hypervisor tlbie
 483  * lock.
 484  */
 485 static void pSeries_lpar_flush_hash_range(unsigned long number, int local)
 486 {
 487         unsigned long vpn;
 488         unsigned long i, pix, rc;
 489         unsigned long flags = 0;
 490         struct ppc64_tlb_batch *batch = &__get_cpu_var(ppc64_tlb_batch);
 491         int lock_tlbie = !mmu_has_feature(MMU_FTR_LOCKLESS_TLBIE);
 492         unsigned long param[9];
 493         unsigned long hash, index, shift, hidx, slot;
 494         real_pte_t pte;
 495         int psize, ssize;
 496
 497         if (lock_tlbie)
 498                 spin_lock_irqsave(&pSeries_lpar_tlbie_lock, flags);
 499
 500         psize = batch->psize;
 501         ssize = batch->ssize;
 502         pix = 0;
 503         for (i = 0; i < number; i++) {
 504                 vpn = batch->vpn[i];
 505                 pte = batch->pte[i];
 506                 pte_iterate_hashed_subpages(pte, psize, vpn, index, shift) {
 507                         hash = hpt_hash(vpn, shift, ssize);
 508                         hidx = __rpte_to_hidx(pte, index);
 509                         if (hidx & _PTEIDX_SECONDARY)
 510                                 hash = ~hash;
 511                         slot = (hash & htab_hash_mask) * HPTES_PER_GROUP;
 512                         slot += hidx & _PTEIDX_GROUP_IX;
 513                         if (!firmware_has_feature(FW_FEATURE_BULK_REMOVE)) {
 514                                 /*
 515                                  * lpar doesn't use the passed actual page size
 516                                  */
 517                                 pSeries_lpar_hpte_invalidate(slot, vpn, psize,
 518                                                              0, ssize, local);
 519                         } else {
 520                                 param[pix] = HBR_REQUEST | HBR_AVPN | slot;
 521                                 param[pix+1] = hpte_encode_avpn(vpn, psize,
 522                                                                 ssize);
 523                                 pix += 2;
 524                                 if (pix == 8) {
 525                                         rc = plpar_hcall9(H_BULK_REMOVE, param,
 526                                                 param[0], param[1], param[2],
 527                                                 param[3], param[4], param[5],
 528                                                 param[6], param[7]);
 529                                         BUG_ON(rc != H_SUCCESS);
 530                                         pix = 0;
 531                                 }
 532                         }
 533                 } pte_iterate_hashed_end();
 534         }
 535         if (pix) {
 536                 param[pix] = HBR_END;
 537                 rc = plpar_hcall9(H_BULK_REMOVE, param, param[0], param[1],
 538                                   param[2], param[3], param[4], param[5],
 539                                   param[6], param[7]);
 540                 BUG_ON(rc != H_SUCCESS);
 541         }
 542
 543         if (lock_tlbie)
 544                 spin_unlock_irqrestore(&pSeries_lpar_tlbie_lock, flags);
 545 }
 546
 547 static int __init disable_bulk_remove(char *str)
 548 {
 549         if (strcmp(str, "off") == 0 &&
 550             firmware_has_feature(FW_FEATURE_BULK_REMOVE)) {
 551                         printk(KERN_INFO "Disabling BULK_REMOVE firmware feature");
 552                         powerpc_firmware_features &= ~FW_FEATURE_BULK_REMOVE;
 553         }
 554         return 1;
 555 }
 556
 557 __setup("bulk_remove=", disable_bulk_remove);
 558
 559 void __init hpte_init_lpar(void)
 560 {
 561         ppc_md.hpte_invalidate  = pSeries_lpar_hpte_invalidate;
 562         ppc_md.hpte_updatepp    = pSeries_lpar_hpte_updatepp;
 563         ppc_md.hpte_updateboltedpp = pSeries_lpar_hpte_updateboltedpp;
 564         ppc_md.hpte_insert      = pSeries_lpar_hpte_insert;
 565         ppc_md.hpte_remove      = pSeries_lpar_hpte_remove;
 566         ppc_md.hpte_removebolted = pSeries_lpar_hpte_removebolted;
 567         ppc_md.flush_hash_range = pSeries_lpar_flush_hash_range;
 568         ppc_md.hpte_clear_all   = pSeries_lpar_hptab_clear;
 569         ppc_md.hugepage_invalidate = pSeries_lpar_hugepage_invalidate;
 570 }
 571
 572 #ifdef CONFIG_PPC_SMLPAR
 573 #define CMO_FREE_HINT_DEFAULT 1
 574 static int cmo_free_hint_flag = CMO_FREE_HINT_DEFAULT;
 575
 576 static int __init cmo_free_hint(char *str)
 577 {
 578         char *parm;
 579         parm = strstrip(str);
 580
 581         if (strcasecmp(parm, "no") == 0 || strcasecmp(parm, "off") == 0) {
 582                 printk(KERN_INFO "cmo_free_hint: CMO free page hinting is not active.\n");
 583                 cmo_free_hint_flag = 0;
 584                 return 1;
 585         }
 586
 587         cmo_free_hint_flag = 1;
 588         printk(KERN_INFO "cmo_free_hint: CMO free page hinting is active.\n");
 589
 590         if (strcasecmp(parm, "yes") == 0 || strcasecmp(parm, "on") == 0)
 591                 return 1;
 592
 593         return 0;
 594 }
 595
 596 __setup("cmo_free_hint=", cmo_free_hint);
 597
 598 static void pSeries_set_page_state(struct page *page, int order,
 599                                    unsigned long state)
 600 {
 601         int i, j;
 602         unsigned long cmo_page_sz, addr;
 603
 604         cmo_page_sz = cmo_get_page_size();
 605         addr = __pa((unsigned long)page_address(page));
 606
 607         for (i = 0; i < (1 << order); i++, addr += PAGE_SIZE) {
 608                 for (j = 0; j < PAGE_SIZE; j += cmo_page_sz)
 609                         plpar_hcall_norets(H_PAGE_INIT, state, addr + j, 0);
 610         }
 611 }
 612
 613 void arch_free_page(struct page *page, int order)
 614 {
 615         if (!cmo_free_hint_flag || !firmware_has_feature(FW_FEATURE_CMO))
 616                 return;
 617
 618         pSeries_set_page_state(page, order, H_PAGE_SET_UNUSED);
 619 }
 620 EXPORT_SYMBOL(arch_free_page);
 621
 622 #endif
 623
 624 #ifdef CONFIG_TRACEPOINTS
 625 /*
 626  * We optimise our hcall path by placing hcall_tracepoint_refcount
 627  * directly in the TOC so we can check if the hcall tracepoints are
 628  * enabled via a single load.
 629  */
 630
 631 /* NB: reg/unreg are called while guarded with the tracepoints_mutex */
 632 extern long hcall_tracepoint_refcount;
 633
 634 /*
 635  * Since the tracing code might execute hcalls we need to guard against
 636  * recursion. One example of this are spinlocks calling H_YIELD on
 637  * shared processor partitions.
 638  */
 639 static DEFINE_PER_CPU(unsigned int, hcall_trace_depth);
 640
 641 void hcall_tracepoint_regfunc(void)
 642 {
 643         hcall_tracepoint_refcount++;
 644 }
 645
 646 void hcall_tracepoint_unregfunc(void)
 647 {
 648         hcall_tracepoint_refcount--;
 649 }
 650
 651 void __trace_hcall_entry(unsigned long opcode, unsigned long *args)
 652 {
 653         unsigned long flags;
 654         unsigned int *depth;
 655
 656         /*
 657          * We cannot call tracepoints inside RCU idle regions which
 658          * means we must not trace H_CEDE.
 659          */
 660         if (opcode == H_CEDE)
 661                 return;
 662
 663         local_irq_save(flags);
 664
 665         depth = &__get_cpu_var(hcall_trace_depth);
 666
 667         if (*depth)
 668                 goto out;
 669
 670         (*depth)++;
 671         preempt_disable();
 672         trace_hcall_entry(opcode, args);
 673         (*depth)--;
 674
 675 out:
 676         local_irq_restore(flags);
 677 }
 678
 679 void __trace_hcall_exit(long opcode, unsigned long retval,
 680                         unsigned long *retbuf)
 681 {
 682         unsigned long flags;
 683         unsigned int *depth;
 684
 685         if (opcode == H_CEDE)
 686                 return;
 687
 688         local_irq_save(flags);
 689
 690         depth = &__get_cpu_var(hcall_trace_depth);
 691
 692         if (*depth)
 693                 goto out;
 694
 695         (*depth)++;
 696         trace_hcall_exit(opcode, retval, retbuf);
 697         preempt_enable();
 698         (*depth)--;
 699
 700 out:
 701         local_irq_restore(flags);
 702 }
 703 #endif
 704
 705 /**
 706  * h_get_mpp
 707  * H_GET_MPP hcall returns info in 7 parms
 708  */
 709 int h_get_mpp(struct hvcall_mpp_data *mpp_data)
 710 {
 711         int rc;
 712         unsigned long retbuf[PLPAR_HCALL9_BUFSIZE];
 713
 714         rc = plpar_hcall9(H_GET_MPP, retbuf);
 715
 716         mpp_data->entitled_mem = retbuf[0];
 717         mpp_data->mapped_mem = retbuf[1];
 718
 719         mpp_data->group_num = (retbuf[2] >> 2 * 8) & 0xffff;
 720         mpp_data->pool_num = retbuf[2] & 0xffff;
 721
 722         mpp_data->mem_weight = (retbuf[3] >> 7 * 8) & 0xff;
 723         mpp_data->unallocated_mem_weight = (retbuf[3] >> 6 * 8) & 0xff;
 724         mpp_data->unallocated_entitlement = retbuf[3] & 0xffffffffffff;
 725
 726         mpp_data->pool_size = retbuf[4];
 727         mpp_data->loan_request = retbuf[5];
 728         mpp_data->backing_mem = retbuf[6];
 729
 730         return rc;
 731 }
 732 EXPORT_SYMBOL(h_get_mpp);
 733
 734 int h_get_mpp_x(struct hvcall_mpp_x_data *mpp_x_data)
 735 {
 736         int rc;
 737         unsigned long retbuf[PLPAR_HCALL9_BUFSIZE] = { 0 };
 738
 739         rc = plpar_hcall9(H_GET_MPP_X, retbuf);
 740
 741         mpp_x_data->coalesced_bytes = retbuf[0];
 742         mpp_x_data->pool_coalesced_bytes = retbuf[1];
 743         mpp_x_data->pool_purr_cycles = retbuf[2];
 744         mpp_x_data->pool_spurr_cycles = retbuf[3];
 745
 746         return rc;
 747 }