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) | 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 manual_hpte_clear_all(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 } 253 254 static int hcall_hpte_clear_all(void) 255 { 256 int rc; 257 258 do { 259 rc = plpar_hcall_norets(H_CLEAR_HPT); 260 } while (rc == H_CONTINUE); 261 262 return rc; 263 } 264 265 static void pseries_hpte_clear_all(void) 266 { 267 int rc; 268 269 rc = hcall_hpte_clear_all(); 270 if (rc != H_SUCCESS) 271 manual_hpte_clear_all(); 272 273 #ifdef __LITTLE_ENDIAN__ 274 /* 275 * Reset exceptions to big endian. 276 * 277 * FIXME this is a hack for kexec, we need to reset the exception 278 * endian before starting the new kernel and this is a convenient place 279 * to do it. 280 * 281 * This is also called on boot when a fadump happens. In that case we 282 * must not change the exception endian mode. 283 */ 284 if (firmware_has_feature(FW_FEATURE_SET_MODE) && !is_fadump_active()) 285 pseries_big_endian_exceptions(); 286 #endif 287 } 288 289 /* 290 * NOTE: for updatepp ops we are fortunate that the linux "newpp" bits and 291 * the low 3 bits of flags happen to line up. So no transform is needed. 292 * We can probably optimize here and assume the high bits of newpp are 293 * already zero. For now I am paranoid. 294 */ 295 static long pSeries_lpar_hpte_updatepp(unsigned long slot, 296 unsigned long newpp, 297 unsigned long vpn, 298 int psize, int apsize, 299 int ssize, unsigned long inv_flags) 300 { 301 unsigned long lpar_rc; 302 unsigned long flags = (newpp & 7) | H_AVPN; 303 unsigned long want_v; 304 305 want_v = hpte_encode_avpn(vpn, psize, ssize); 306 307 pr_devel(" update: avpnv=%016lx, hash=%016lx, f=%lx, psize: %d ...", 308 want_v, slot, flags, psize); 309 310 lpar_rc = plpar_pte_protect(flags, slot, want_v); 311 312 if (lpar_rc == H_NOT_FOUND) { 313 pr_devel("not found !\n"); 314 return -1; 315 } 316 317 pr_devel("ok\n"); 318 319 BUG_ON(lpar_rc != H_SUCCESS); 320 321 return 0; 322 } 323 324 static long __pSeries_lpar_hpte_find(unsigned long want_v, unsigned long hpte_group) 325 { 326 long lpar_rc; 327 unsigned long i, j; 328 struct { 329 unsigned long pteh; 330 unsigned long ptel; 331 } ptes[4]; 332 333 for (i = 0; i < HPTES_PER_GROUP; i += 4, hpte_group += 4) { 334 335 lpar_rc = plpar_pte_read_4(0, hpte_group, (void *)ptes); 336 if (lpar_rc != H_SUCCESS) 337 continue; 338 339 for (j = 0; j < 4; j++) { 340 if (HPTE_V_COMPARE(ptes[j].pteh, want_v) && 341 (ptes[j].pteh & HPTE_V_VALID)) 342 return i + j; 343 } 344 } 345 346 return -1; 347 } 348 349 static long pSeries_lpar_hpte_find(unsigned long vpn, int psize, int ssize) 350 { 351 long slot; 352 unsigned long hash; 353 unsigned long want_v; 354 unsigned long hpte_group; 355 356 hash = hpt_hash(vpn, mmu_psize_defs[psize].shift, ssize); 357 want_v = hpte_encode_avpn(vpn, psize, ssize); 358 359 /* Bolted entries are always in the primary group */ 360 hpte_group = (hash & htab_hash_mask) * HPTES_PER_GROUP; 361 slot = __pSeries_lpar_hpte_find(want_v, hpte_group); 362 if (slot < 0) 363 return -1; 364 return hpte_group + slot; 365 } 366 367 static void pSeries_lpar_hpte_updateboltedpp(unsigned long newpp, 368 unsigned long ea, 369 int psize, int ssize) 370 { 371 unsigned long vpn; 372 unsigned long lpar_rc, slot, vsid, flags; 373 374 vsid = get_kernel_vsid(ea, ssize); 375 vpn = hpt_vpn(ea, vsid, ssize); 376 377 slot = pSeries_lpar_hpte_find(vpn, psize, ssize); 378 BUG_ON(slot == -1); 379 380 flags = newpp & 7; 381 lpar_rc = plpar_pte_protect(flags, slot, 0); 382 383 BUG_ON(lpar_rc != H_SUCCESS); 384 } 385 386 static void pSeries_lpar_hpte_invalidate(unsigned long slot, unsigned long vpn, 387 int psize, int apsize, 388 int ssize, int local) 389 { 390 unsigned long want_v; 391 unsigned long lpar_rc; 392 unsigned long dummy1, dummy2; 393 394 pr_devel(" inval : slot=%lx, vpn=%016lx, psize: %d, local: %d\n", 395 slot, vpn, psize, local); 396 397 want_v = hpte_encode_avpn(vpn, psize, ssize); 398 lpar_rc = plpar_pte_remove(H_AVPN, slot, want_v, &dummy1, &dummy2); 399 if (lpar_rc == H_NOT_FOUND) 400 return; 401 402 BUG_ON(lpar_rc != H_SUCCESS); 403 } 404 405 #ifdef CONFIG_TRANSPARENT_HUGEPAGE 406 /* 407 * Limit iterations holding pSeries_lpar_tlbie_lock to 3. We also need 408 * to make sure that we avoid bouncing the hypervisor tlbie lock. 409 */ 410 #define PPC64_HUGE_HPTE_BATCH 12 411 412 static void __pSeries_lpar_hugepage_invalidate(unsigned long *slot, 413 unsigned long *vpn, int count, 414 int psize, int ssize) 415 { 416 unsigned long param[PLPAR_HCALL9_BUFSIZE]; 417 int i = 0, pix = 0, rc; 418 unsigned long flags = 0; 419 int lock_tlbie = !mmu_has_feature(MMU_FTR_LOCKLESS_TLBIE); 420 421 if (lock_tlbie) 422 spin_lock_irqsave(&pSeries_lpar_tlbie_lock, flags); 423 424 for (i = 0; i < count; i++) { 425 426 if (!firmware_has_feature(FW_FEATURE_BULK_REMOVE)) { 427 pSeries_lpar_hpte_invalidate(slot[i], vpn[i], psize, 0, 428 ssize, 0); 429 } else { 430 param[pix] = HBR_REQUEST | HBR_AVPN | slot[i]; 431 param[pix+1] = hpte_encode_avpn(vpn[i], psize, ssize); 432 pix += 2; 433 if (pix == 8) { 434 rc = plpar_hcall9(H_BULK_REMOVE, param, 435 param[0], param[1], param[2], 436 param[3], param[4], param[5], 437 param[6], param[7]); 438 BUG_ON(rc != H_SUCCESS); 439 pix = 0; 440 } 441 } 442 } 443 if (pix) { 444 param[pix] = HBR_END; 445 rc = plpar_hcall9(H_BULK_REMOVE, param, param[0], param[1], 446 param[2], param[3], param[4], param[5], 447 param[6], param[7]); 448 BUG_ON(rc != H_SUCCESS); 449 } 450 451 if (lock_tlbie) 452 spin_unlock_irqrestore(&pSeries_lpar_tlbie_lock, flags); 453 } 454 455 static void pSeries_lpar_hugepage_invalidate(unsigned long vsid, 456 unsigned long addr, 457 unsigned char *hpte_slot_array, 458 int psize, int ssize, int local) 459 { 460 int i, index = 0; 461 unsigned long s_addr = addr; 462 unsigned int max_hpte_count, valid; 463 unsigned long vpn_array[PPC64_HUGE_HPTE_BATCH]; 464 unsigned long slot_array[PPC64_HUGE_HPTE_BATCH]; 465 unsigned long shift, hidx, vpn = 0, hash, slot; 466 467 shift = mmu_psize_defs[psize].shift; 468 max_hpte_count = 1U << (PMD_SHIFT - shift); 469 470 for (i = 0; i < max_hpte_count; i++) { 471 valid = hpte_valid(hpte_slot_array, i); 472 if (!valid) 473 continue; 474 hidx = hpte_hash_index(hpte_slot_array, i); 475 476 /* get the vpn */ 477 addr = s_addr + (i * (1ul << shift)); 478 vpn = hpt_vpn(addr, vsid, ssize); 479 hash = hpt_hash(vpn, shift, ssize); 480 if (hidx & _PTEIDX_SECONDARY) 481 hash = ~hash; 482 483 slot = (hash & htab_hash_mask) * HPTES_PER_GROUP; 484 slot += hidx & _PTEIDX_GROUP_IX; 485 486 slot_array[index] = slot; 487 vpn_array[index] = vpn; 488 if (index == PPC64_HUGE_HPTE_BATCH - 1) { 489 /* 490 * Now do a bluk invalidate 491 */ 492 __pSeries_lpar_hugepage_invalidate(slot_array, 493 vpn_array, 494 PPC64_HUGE_HPTE_BATCH, 495 psize, ssize); 496 index = 0; 497 } else 498 index++; 499 } 500 if (index) 501 __pSeries_lpar_hugepage_invalidate(slot_array, vpn_array, 502 index, psize, ssize); 503 } 504 #else 505 static void pSeries_lpar_hugepage_invalidate(unsigned long vsid, 506 unsigned long addr, 507 unsigned char *hpte_slot_array, 508 int psize, int ssize, int local) 509 { 510 WARN(1, "%s called without THP support\n", __func__); 511 } 512 #endif 513 514 static int pSeries_lpar_hpte_removebolted(unsigned long ea, 515 int psize, int ssize) 516 { 517 unsigned long vpn; 518 unsigned long slot, vsid; 519 520 vsid = get_kernel_vsid(ea, ssize); 521 vpn = hpt_vpn(ea, vsid, ssize); 522 523 slot = pSeries_lpar_hpte_find(vpn, psize, ssize); 524 if (slot == -1) 525 return -ENOENT; 526 527 /* 528 * lpar doesn't use the passed actual page size 529 */ 530 pSeries_lpar_hpte_invalidate(slot, vpn, psize, 0, ssize, 0); 531 return 0; 532 } 533 534 /* 535 * Take a spinlock around flushes to avoid bouncing the hypervisor tlbie 536 * lock. 537 */ 538 static void pSeries_lpar_flush_hash_range(unsigned long number, int local) 539 { 540 unsigned long vpn; 541 unsigned long i, pix, rc; 542 unsigned long flags = 0; 543 struct ppc64_tlb_batch *batch = this_cpu_ptr(&ppc64_tlb_batch); 544 int lock_tlbie = !mmu_has_feature(MMU_FTR_LOCKLESS_TLBIE); 545 unsigned long param[PLPAR_HCALL9_BUFSIZE]; 546 unsigned long hash, index, shift, hidx, slot; 547 real_pte_t pte; 548 int psize, ssize; 549 550 if (lock_tlbie) 551 spin_lock_irqsave(&pSeries_lpar_tlbie_lock, flags); 552 553 psize = batch->psize; 554 ssize = batch->ssize; 555 pix = 0; 556 for (i = 0; i < number; i++) { 557 vpn = batch->vpn[i]; 558 pte = batch->pte[i]; 559 pte_iterate_hashed_subpages(pte, psize, vpn, index, shift) { 560 hash = hpt_hash(vpn, shift, ssize); 561 hidx = __rpte_to_hidx(pte, index); 562 if (hidx & _PTEIDX_SECONDARY) 563 hash = ~hash; 564 slot = (hash & htab_hash_mask) * HPTES_PER_GROUP; 565 slot += hidx & _PTEIDX_GROUP_IX; 566 if (!firmware_has_feature(FW_FEATURE_BULK_REMOVE)) { 567 /* 568 * lpar doesn't use the passed actual page size 569 */ 570 pSeries_lpar_hpte_invalidate(slot, vpn, psize, 571 0, ssize, local); 572 } else { 573 param[pix] = HBR_REQUEST | HBR_AVPN | slot; 574 param[pix+1] = hpte_encode_avpn(vpn, psize, 575 ssize); 576 pix += 2; 577 if (pix == 8) { 578 rc = plpar_hcall9(H_BULK_REMOVE, param, 579 param[0], param[1], param[2], 580 param[3], param[4], param[5], 581 param[6], param[7]); 582 BUG_ON(rc != H_SUCCESS); 583 pix = 0; 584 } 585 } 586 } pte_iterate_hashed_end(); 587 } 588 if (pix) { 589 param[pix] = HBR_END; 590 rc = plpar_hcall9(H_BULK_REMOVE, param, param[0], param[1], 591 param[2], param[3], param[4], param[5], 592 param[6], param[7]); 593 BUG_ON(rc != H_SUCCESS); 594 } 595 596 if (lock_tlbie) 597 spin_unlock_irqrestore(&pSeries_lpar_tlbie_lock, flags); 598 } 599 600 static int __init disable_bulk_remove(char *str) 601 { 602 if (strcmp(str, "off") == 0 && 603 firmware_has_feature(FW_FEATURE_BULK_REMOVE)) { 604 printk(KERN_INFO "Disabling BULK_REMOVE firmware feature"); 605 powerpc_firmware_features &= ~FW_FEATURE_BULK_REMOVE; 606 } 607 return 1; 608 } 609 610 __setup("bulk_remove=", disable_bulk_remove); 611 612 void __init hpte_init_pseries(void) 613 { 614 mmu_hash_ops.hpte_invalidate = pSeries_lpar_hpte_invalidate; 615 mmu_hash_ops.hpte_updatepp = pSeries_lpar_hpte_updatepp; 616 mmu_hash_ops.hpte_updateboltedpp = pSeries_lpar_hpte_updateboltedpp; 617 mmu_hash_ops.hpte_insert = pSeries_lpar_hpte_insert; 618 mmu_hash_ops.hpte_remove = pSeries_lpar_hpte_remove; 619 mmu_hash_ops.hpte_removebolted = pSeries_lpar_hpte_removebolted; 620 mmu_hash_ops.flush_hash_range = pSeries_lpar_flush_hash_range; 621 mmu_hash_ops.hpte_clear_all = pseries_hpte_clear_all; 622 mmu_hash_ops.hugepage_invalidate = pSeries_lpar_hugepage_invalidate; 623 } 624 625 #ifdef CONFIG_PPC_SMLPAR 626 #define CMO_FREE_HINT_DEFAULT 1 627 static int cmo_free_hint_flag = CMO_FREE_HINT_DEFAULT; 628 629 static int __init cmo_free_hint(char *str) 630 { 631 char *parm; 632 parm = strstrip(str); 633 634 if (strcasecmp(parm, "no") == 0 || strcasecmp(parm, "off") == 0) { 635 printk(KERN_INFO "cmo_free_hint: CMO free page hinting is not active.\n"); 636 cmo_free_hint_flag = 0; 637 return 1; 638 } 639 640 cmo_free_hint_flag = 1; 641 printk(KERN_INFO "cmo_free_hint: CMO free page hinting is active.\n"); 642 643 if (strcasecmp(parm, "yes") == 0 || strcasecmp(parm, "on") == 0) 644 return 1; 645 646 return 0; 647 } 648 649 __setup("cmo_free_hint=", cmo_free_hint); 650 651 static void pSeries_set_page_state(struct page *page, int order, 652 unsigned long state) 653 { 654 int i, j; 655 unsigned long cmo_page_sz, addr; 656 657 cmo_page_sz = cmo_get_page_size(); 658 addr = __pa((unsigned long)page_address(page)); 659 660 for (i = 0; i < (1 << order); i++, addr += PAGE_SIZE) { 661 for (j = 0; j < PAGE_SIZE; j += cmo_page_sz) 662 plpar_hcall_norets(H_PAGE_INIT, state, addr + j, 0); 663 } 664 } 665 666 void arch_free_page(struct page *page, int order) 667 { 668 if (radix_enabled()) 669 return; 670 if (!cmo_free_hint_flag || !firmware_has_feature(FW_FEATURE_CMO)) 671 return; 672 673 pSeries_set_page_state(page, order, H_PAGE_SET_UNUSED); 674 } 675 EXPORT_SYMBOL(arch_free_page); 676 677 #endif /* CONFIG_PPC_SMLPAR */ 678 #endif /* CONFIG_PPC_STD_MMU_64 */ 679 680 #ifdef CONFIG_TRACEPOINTS 681 #ifdef HAVE_JUMP_LABEL 682 struct static_key hcall_tracepoint_key = STATIC_KEY_INIT; 683 684 int hcall_tracepoint_regfunc(void) 685 { 686 static_key_slow_inc(&hcall_tracepoint_key); 687 return 0; 688 } 689 690 void hcall_tracepoint_unregfunc(void) 691 { 692 static_key_slow_dec(&hcall_tracepoint_key); 693 } 694 #else 695 /* 696 * We optimise our hcall path by placing hcall_tracepoint_refcount 697 * directly in the TOC so we can check if the hcall tracepoints are 698 * enabled via a single load. 699 */ 700 701 /* NB: reg/unreg are called while guarded with the tracepoints_mutex */ 702 extern long hcall_tracepoint_refcount; 703 704 int hcall_tracepoint_regfunc(void) 705 { 706 hcall_tracepoint_refcount++; 707 return 0; 708 } 709 710 void hcall_tracepoint_unregfunc(void) 711 { 712 hcall_tracepoint_refcount--; 713 } 714 #endif 715 716 /* 717 * Since the tracing code might execute hcalls we need to guard against 718 * recursion. One example of this are spinlocks calling H_YIELD on 719 * shared processor partitions. 720 */ 721 static DEFINE_PER_CPU(unsigned int, hcall_trace_depth); 722 723 724 void __trace_hcall_entry(unsigned long opcode, unsigned long *args) 725 { 726 unsigned long flags; 727 unsigned int *depth; 728 729 /* 730 * We cannot call tracepoints inside RCU idle regions which 731 * means we must not trace H_CEDE. 732 */ 733 if (opcode == H_CEDE) 734 return; 735 736 local_irq_save(flags); 737 738 depth = this_cpu_ptr(&hcall_trace_depth); 739 740 if (*depth) 741 goto out; 742 743 (*depth)++; 744 preempt_disable(); 745 trace_hcall_entry(opcode, args); 746 (*depth)--; 747 748 out: 749 local_irq_restore(flags); 750 } 751 752 void __trace_hcall_exit(long opcode, unsigned long retval, 753 unsigned long *retbuf) 754 { 755 unsigned long flags; 756 unsigned int *depth; 757 758 if (opcode == H_CEDE) 759 return; 760 761 local_irq_save(flags); 762 763 depth = this_cpu_ptr(&hcall_trace_depth); 764 765 if (*depth) 766 goto out; 767 768 (*depth)++; 769 trace_hcall_exit(opcode, retval, retbuf); 770 preempt_enable(); 771 (*depth)--; 772 773 out: 774 local_irq_restore(flags); 775 } 776 #endif 777 778 /** 779 * h_get_mpp 780 * H_GET_MPP hcall returns info in 7 parms 781 */ 782 int h_get_mpp(struct hvcall_mpp_data *mpp_data) 783 { 784 int rc; 785 unsigned long retbuf[PLPAR_HCALL9_BUFSIZE]; 786 787 rc = plpar_hcall9(H_GET_MPP, retbuf); 788 789 mpp_data->entitled_mem = retbuf[0]; 790 mpp_data->mapped_mem = retbuf[1]; 791 792 mpp_data->group_num = (retbuf[2] >> 2 * 8) & 0xffff; 793 mpp_data->pool_num = retbuf[2] & 0xffff; 794 795 mpp_data->mem_weight = (retbuf[3] >> 7 * 8) & 0xff; 796 mpp_data->unallocated_mem_weight = (retbuf[3] >> 6 * 8) & 0xff; 797 mpp_data->unallocated_entitlement = retbuf[3] & 0xffffffffffffUL; 798 799 mpp_data->pool_size = retbuf[4]; 800 mpp_data->loan_request = retbuf[5]; 801 mpp_data->backing_mem = retbuf[6]; 802 803 return rc; 804 } 805 EXPORT_SYMBOL(h_get_mpp); 806 807 int h_get_mpp_x(struct hvcall_mpp_x_data *mpp_x_data) 808 { 809 int rc; 810 unsigned long retbuf[PLPAR_HCALL9_BUFSIZE] = { 0 }; 811 812 rc = plpar_hcall9(H_GET_MPP_X, retbuf); 813 814 mpp_x_data->coalesced_bytes = retbuf[0]; 815 mpp_x_data->pool_coalesced_bytes = retbuf[1]; 816 mpp_x_data->pool_purr_cycles = retbuf[2]; 817 mpp_x_data->pool_spurr_cycles = retbuf[3]; 818 819 return rc; 820 } 821