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