1 /* 2 * pSeries_lpar.c 3 * Copyright (C) 2001 Todd Inglett, IBM Corporation 4 * 5 * pSeries LPAR support. 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License as published by 9 * the Free Software Foundation; either version 2 of the License, or 10 * (at your option) any later version. 11 * 12 * This program is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * GNU General Public License for more details. 16 * 17 * You should have received a copy of the GNU General Public License 18 * along with this program; if not, write to the Free Software 19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 20 */ 21 22 /* Enables debugging of low-level hash table routines - careful! */ 23 #undef DEBUG 24 25 #include <linux/kernel.h> 26 #include <linux/dma-mapping.h> 27 #include <linux/console.h> 28 #include <linux/export.h> 29 #include <linux/jump_label.h> 30 #include <asm/processor.h> 31 #include <asm/mmu.h> 32 #include <asm/page.h> 33 #include <asm/pgtable.h> 34 #include <asm/machdep.h> 35 #include <asm/mmu_context.h> 36 #include <asm/iommu.h> 37 #include <asm/tlbflush.h> 38 #include <asm/tlb.h> 39 #include <asm/prom.h> 40 #include <asm/cputable.h> 41 #include <asm/udbg.h> 42 #include <asm/smp.h> 43 #include <asm/trace.h> 44 #include <asm/firmware.h> 45 #include <asm/plpar_wrappers.h> 46 #include <asm/kexec.h> 47 #include <asm/fadump.h> 48 #include <asm/asm-prototypes.h> 49 50 #include "pseries.h" 51 52 /* Flag bits for H_BULK_REMOVE */ 53 #define HBR_REQUEST 0x4000000000000000UL 54 #define HBR_RESPONSE 0x8000000000000000UL 55 #define HBR_END 0xc000000000000000UL 56 #define HBR_AVPN 0x0200000000000000UL 57 #define HBR_ANDCOND 0x0100000000000000UL 58 59 60 /* in hvCall.S */ 61 EXPORT_SYMBOL(plpar_hcall); 62 EXPORT_SYMBOL(plpar_hcall9); 63 EXPORT_SYMBOL(plpar_hcall_norets); 64 65 void vpa_init(int cpu) 66 { 67 int hwcpu = get_hard_smp_processor_id(cpu); 68 unsigned long addr; 69 long ret; 70 struct paca_struct *pp; 71 struct dtl_entry *dtl; 72 73 /* 74 * The spec says it "may be problematic" if CPU x registers the VPA of 75 * CPU y. We should never do that, but wail if we ever do. 76 */ 77 WARN_ON(cpu != smp_processor_id()); 78 79 if (cpu_has_feature(CPU_FTR_ALTIVEC)) 80 lppaca_of(cpu).vmxregs_in_use = 1; 81 82 if (cpu_has_feature(CPU_FTR_ARCH_207S)) 83 lppaca_of(cpu).ebb_regs_in_use = 1; 84 85 addr = __pa(&lppaca_of(cpu)); 86 ret = register_vpa(hwcpu, addr); 87 88 if (ret) { 89 pr_err("WARNING: VPA registration for cpu %d (hw %d) of area " 90 "%lx failed with %ld\n", cpu, hwcpu, addr, ret); 91 return; 92 } 93 94 #ifdef CONFIG_PPC_STD_MMU_64 95 /* 96 * PAPR says this feature is SLB-Buffer but firmware never 97 * reports that. All SPLPAR support SLB shadow buffer. 98 */ 99 if (!radix_enabled() && firmware_has_feature(FW_FEATURE_SPLPAR)) { 100 addr = __pa(paca[cpu].slb_shadow_ptr); 101 ret = register_slb_shadow(hwcpu, addr); 102 if (ret) 103 pr_err("WARNING: SLB shadow buffer registration for " 104 "cpu %d (hw %d) of area %lx failed with %ld\n", 105 cpu, hwcpu, addr, ret); 106 } 107 #endif /* CONFIG_PPC_STD_MMU_64 */ 108 109 /* 110 * Register dispatch trace log, if one has been allocated. 111 */ 112 pp = &paca[cpu]; 113 dtl = pp->dispatch_log; 114 if (dtl) { 115 pp->dtl_ridx = 0; 116 pp->dtl_curr = dtl; 117 lppaca_of(cpu).dtl_idx = 0; 118 119 /* hypervisor reads buffer length from this field */ 120 dtl->enqueue_to_dispatch_time = cpu_to_be32(DISPATCH_LOG_BYTES); 121 ret = register_dtl(hwcpu, __pa(dtl)); 122 if (ret) 123 pr_err("WARNING: DTL registration of cpu %d (hw %d) " 124 "failed with %ld\n", smp_processor_id(), 125 hwcpu, ret); 126 lppaca_of(cpu).dtl_enable_mask = 2; 127 } 128 } 129 130 #ifdef CONFIG_PPC_STD_MMU_64 131 132 static long pSeries_lpar_hpte_insert(unsigned long hpte_group, 133 unsigned long vpn, unsigned long pa, 134 unsigned long rflags, unsigned long vflags, 135 int psize, int apsize, int ssize) 136 { 137 unsigned long lpar_rc; 138 unsigned long flags; 139 unsigned long slot; 140 unsigned long hpte_v, hpte_r; 141 142 if (!(vflags & HPTE_V_BOLTED)) 143 pr_devel("hpte_insert(group=%lx, vpn=%016lx, " 144 "pa=%016lx, rflags=%lx, vflags=%lx, psize=%d)\n", 145 hpte_group, vpn, pa, rflags, vflags, psize); 146 147 hpte_v = hpte_encode_v(vpn, psize, apsize, ssize) | vflags | HPTE_V_VALID; 148 hpte_r = hpte_encode_r(pa, psize, apsize, ssize) | rflags; 149 150 if (!(vflags & HPTE_V_BOLTED)) 151 pr_devel(" hpte_v=%016lx, hpte_r=%016lx\n", hpte_v, hpte_r); 152 153 /* Now fill in the actual HPTE */ 154 /* Set CEC cookie to 0 */ 155 /* Zero page = 0 */ 156 /* I-cache Invalidate = 0 */ 157 /* I-cache synchronize = 0 */ 158 /* Exact = 0 */ 159 flags = 0; 160 161 if (firmware_has_feature(FW_FEATURE_XCMO) && !(hpte_r & HPTE_R_N)) 162 flags |= H_COALESCE_CAND; 163 164 lpar_rc = plpar_pte_enter(flags, hpte_group, hpte_v, hpte_r, &slot); 165 if (unlikely(lpar_rc == H_PTEG_FULL)) { 166 if (!(vflags & HPTE_V_BOLTED)) 167 pr_devel(" full\n"); 168 return -1; 169 } 170 171 /* 172 * Since we try and ioremap PHBs we don't own, the pte insert 173 * will fail. However we must catch the failure in hash_page 174 * or we will loop forever, so return -2 in this case. 175 */ 176 if (unlikely(lpar_rc != H_SUCCESS)) { 177 if (!(vflags & HPTE_V_BOLTED)) 178 pr_devel(" lpar err %ld\n", lpar_rc); 179 return -2; 180 } 181 if (!(vflags & HPTE_V_BOLTED)) 182 pr_devel(" -> slot: %lu\n", slot & 7); 183 184 /* Because of iSeries, we have to pass down the secondary 185 * bucket bit here as well 186 */ 187 return (slot & 7) | (!!(vflags & HPTE_V_SECONDARY) << 3); 188 } 189 190 static DEFINE_SPINLOCK(pSeries_lpar_tlbie_lock); 191 192 static long pSeries_lpar_hpte_remove(unsigned long hpte_group) 193 { 194 unsigned long slot_offset; 195 unsigned long lpar_rc; 196 int i; 197 unsigned long dummy1, dummy2; 198 199 /* pick a random slot to start at */ 200 slot_offset = mftb() & 0x7; 201 202 for (i = 0; i < HPTES_PER_GROUP; i++) { 203 204 /* don't remove a bolted entry */ 205 lpar_rc = plpar_pte_remove(H_ANDCOND, hpte_group + slot_offset, 206 (0x1UL << 4), &dummy1, &dummy2); 207 if (lpar_rc == H_SUCCESS) 208 return i; 209 210 /* 211 * The test for adjunct partition is performed before the 212 * ANDCOND test. H_RESOURCE may be returned, so we need to 213 * check for that as well. 214 */ 215 BUG_ON(lpar_rc != H_NOT_FOUND && lpar_rc != H_RESOURCE); 216 217 slot_offset++; 218 slot_offset &= 0x7; 219 } 220 221 return -1; 222 } 223 224 static void pSeries_lpar_hptab_clear(void) 225 { 226 unsigned long size_bytes = 1UL << ppc64_pft_size; 227 unsigned long hpte_count = size_bytes >> 4; 228 struct { 229 unsigned long pteh; 230 unsigned long ptel; 231 } ptes[4]; 232 long lpar_rc; 233 unsigned long i, j; 234 235 /* Read in batches of 4, 236 * invalidate only valid entries not in the VRMA 237 * hpte_count will be a multiple of 4 238 */ 239 for (i = 0; i < hpte_count; i += 4) { 240 lpar_rc = plpar_pte_read_4_raw(0, i, (void *)ptes); 241 if (lpar_rc != H_SUCCESS) 242 continue; 243 for (j = 0; j < 4; j++){ 244 if ((ptes[j].pteh & HPTE_V_VRMA_MASK) == 245 HPTE_V_VRMA_MASK) 246 continue; 247 if (ptes[j].pteh & HPTE_V_VALID) 248 plpar_pte_remove_raw(0, i + j, 0, 249 &(ptes[j].pteh), &(ptes[j].ptel)); 250 } 251 } 252 253 #ifdef __LITTLE_ENDIAN__ 254 /* 255 * Reset exceptions to big endian. 256 * 257 * FIXME this is a hack for kexec, we need to reset the exception 258 * endian before starting the new kernel and this is a convenient place 259 * to do it. 260 * 261 * This is also called on boot when a fadump happens. In that case we 262 * must not change the exception endian mode. 263 */ 264 if (firmware_has_feature(FW_FEATURE_SET_MODE) && !is_fadump_active()) 265 pseries_big_endian_exceptions(); 266 #endif 267 } 268 269 /* 270 * NOTE: for updatepp ops we are fortunate that the linux "newpp" bits and 271 * the low 3 bits of flags happen to line up. So no transform is needed. 272 * We can probably optimize here and assume the high bits of newpp are 273 * already zero. For now I am paranoid. 274 */ 275 static long pSeries_lpar_hpte_updatepp(unsigned long slot, 276 unsigned long newpp, 277 unsigned long vpn, 278 int psize, int apsize, 279 int ssize, unsigned long inv_flags) 280 { 281 unsigned long lpar_rc; 282 unsigned long flags = (newpp & 7) | H_AVPN; 283 unsigned long want_v; 284 285 want_v = hpte_encode_avpn(vpn, psize, ssize); 286 287 pr_devel(" update: avpnv=%016lx, hash=%016lx, f=%lx, psize: %d ...", 288 want_v, slot, flags, psize); 289 290 lpar_rc = plpar_pte_protect(flags, slot, want_v); 291 292 if (lpar_rc == H_NOT_FOUND) { 293 pr_devel("not found !\n"); 294 return -1; 295 } 296 297 pr_devel("ok\n"); 298 299 BUG_ON(lpar_rc != H_SUCCESS); 300 301 return 0; 302 } 303 304 static long __pSeries_lpar_hpte_find(unsigned long want_v, unsigned long hpte_group) 305 { 306 long lpar_rc; 307 unsigned long i, j; 308 struct { 309 unsigned long pteh; 310 unsigned long ptel; 311 } ptes[4]; 312 313 for (i = 0; i < HPTES_PER_GROUP; i += 4, hpte_group += 4) { 314 315 lpar_rc = plpar_pte_read_4(0, hpte_group, (void *)ptes); 316 if (lpar_rc != H_SUCCESS) 317 continue; 318 319 for (j = 0; j < 4; j++) { 320 if (HPTE_V_COMPARE(ptes[j].pteh, want_v) && 321 (ptes[j].pteh & HPTE_V_VALID)) 322 return i + j; 323 } 324 } 325 326 return -1; 327 } 328 329 static long pSeries_lpar_hpte_find(unsigned long vpn, int psize, int ssize) 330 { 331 long slot; 332 unsigned long hash; 333 unsigned long want_v; 334 unsigned long hpte_group; 335 336 hash = hpt_hash(vpn, mmu_psize_defs[psize].shift, ssize); 337 want_v = hpte_encode_avpn(vpn, psize, ssize); 338 339 /* Bolted entries are always in the primary group */ 340 hpte_group = (hash & htab_hash_mask) * HPTES_PER_GROUP; 341 slot = __pSeries_lpar_hpte_find(want_v, hpte_group); 342 if (slot < 0) 343 return -1; 344 return hpte_group + slot; 345 } 346 347 static void pSeries_lpar_hpte_updateboltedpp(unsigned long newpp, 348 unsigned long ea, 349 int psize, int ssize) 350 { 351 unsigned long vpn; 352 unsigned long lpar_rc, slot, vsid, flags; 353 354 vsid = get_kernel_vsid(ea, ssize); 355 vpn = hpt_vpn(ea, vsid, ssize); 356 357 slot = pSeries_lpar_hpte_find(vpn, psize, ssize); 358 BUG_ON(slot == -1); 359 360 flags = newpp & 7; 361 lpar_rc = plpar_pte_protect(flags, slot, 0); 362 363 BUG_ON(lpar_rc != H_SUCCESS); 364 } 365 366 static void pSeries_lpar_hpte_invalidate(unsigned long slot, unsigned long vpn, 367 int psize, int apsize, 368 int ssize, int local) 369 { 370 unsigned long want_v; 371 unsigned long lpar_rc; 372 unsigned long dummy1, dummy2; 373 374 pr_devel(" inval : slot=%lx, vpn=%016lx, psize: %d, local: %d\n", 375 slot, vpn, psize, local); 376 377 want_v = hpte_encode_avpn(vpn, psize, ssize); 378 lpar_rc = plpar_pte_remove(H_AVPN, slot, want_v, &dummy1, &dummy2); 379 if (lpar_rc == H_NOT_FOUND) 380 return; 381 382 BUG_ON(lpar_rc != H_SUCCESS); 383 } 384 385 #ifdef CONFIG_TRANSPARENT_HUGEPAGE 386 /* 387 * Limit iterations holding pSeries_lpar_tlbie_lock to 3. We also need 388 * to make sure that we avoid bouncing the hypervisor tlbie lock. 389 */ 390 #define PPC64_HUGE_HPTE_BATCH 12 391 392 static void __pSeries_lpar_hugepage_invalidate(unsigned long *slot, 393 unsigned long *vpn, int count, 394 int psize, int ssize) 395 { 396 unsigned long param[8]; 397 int i = 0, pix = 0, rc; 398 unsigned long flags = 0; 399 int lock_tlbie = !mmu_has_feature(MMU_FTR_LOCKLESS_TLBIE); 400 401 if (lock_tlbie) 402 spin_lock_irqsave(&pSeries_lpar_tlbie_lock, flags); 403 404 for (i = 0; i < count; i++) { 405 406 if (!firmware_has_feature(FW_FEATURE_BULK_REMOVE)) { 407 pSeries_lpar_hpte_invalidate(slot[i], vpn[i], psize, 0, 408 ssize, 0); 409 } else { 410 param[pix] = HBR_REQUEST | HBR_AVPN | slot[i]; 411 param[pix+1] = hpte_encode_avpn(vpn[i], psize, ssize); 412 pix += 2; 413 if (pix == 8) { 414 rc = plpar_hcall9(H_BULK_REMOVE, param, 415 param[0], param[1], param[2], 416 param[3], param[4], param[5], 417 param[6], param[7]); 418 BUG_ON(rc != H_SUCCESS); 419 pix = 0; 420 } 421 } 422 } 423 if (pix) { 424 param[pix] = HBR_END; 425 rc = plpar_hcall9(H_BULK_REMOVE, param, param[0], param[1], 426 param[2], param[3], param[4], param[5], 427 param[6], param[7]); 428 BUG_ON(rc != H_SUCCESS); 429 } 430 431 if (lock_tlbie) 432 spin_unlock_irqrestore(&pSeries_lpar_tlbie_lock, flags); 433 } 434 435 static void pSeries_lpar_hugepage_invalidate(unsigned long vsid, 436 unsigned long addr, 437 unsigned char *hpte_slot_array, 438 int psize, int ssize, int local) 439 { 440 int i, index = 0; 441 unsigned long s_addr = addr; 442 unsigned int max_hpte_count, valid; 443 unsigned long vpn_array[PPC64_HUGE_HPTE_BATCH]; 444 unsigned long slot_array[PPC64_HUGE_HPTE_BATCH]; 445 unsigned long shift, hidx, vpn = 0, hash, slot; 446 447 shift = mmu_psize_defs[psize].shift; 448 max_hpte_count = 1U << (PMD_SHIFT - shift); 449 450 for (i = 0; i < max_hpte_count; i++) { 451 valid = hpte_valid(hpte_slot_array, i); 452 if (!valid) 453 continue; 454 hidx = hpte_hash_index(hpte_slot_array, i); 455 456 /* get the vpn */ 457 addr = s_addr + (i * (1ul << shift)); 458 vpn = hpt_vpn(addr, vsid, ssize); 459 hash = hpt_hash(vpn, shift, ssize); 460 if (hidx & _PTEIDX_SECONDARY) 461 hash = ~hash; 462 463 slot = (hash & htab_hash_mask) * HPTES_PER_GROUP; 464 slot += hidx & _PTEIDX_GROUP_IX; 465 466 slot_array[index] = slot; 467 vpn_array[index] = vpn; 468 if (index == PPC64_HUGE_HPTE_BATCH - 1) { 469 /* 470 * Now do a bluk invalidate 471 */ 472 __pSeries_lpar_hugepage_invalidate(slot_array, 473 vpn_array, 474 PPC64_HUGE_HPTE_BATCH, 475 psize, ssize); 476 index = 0; 477 } else 478 index++; 479 } 480 if (index) 481 __pSeries_lpar_hugepage_invalidate(slot_array, vpn_array, 482 index, psize, ssize); 483 } 484 #else 485 static void pSeries_lpar_hugepage_invalidate(unsigned long vsid, 486 unsigned long addr, 487 unsigned char *hpte_slot_array, 488 int psize, int ssize, int local) 489 { 490 WARN(1, "%s called without THP support\n", __func__); 491 } 492 #endif 493 494 static int pSeries_lpar_hpte_removebolted(unsigned long ea, 495 int psize, int ssize) 496 { 497 unsigned long vpn; 498 unsigned long slot, vsid; 499 500 vsid = get_kernel_vsid(ea, ssize); 501 vpn = hpt_vpn(ea, vsid, ssize); 502 503 slot = pSeries_lpar_hpte_find(vpn, psize, ssize); 504 if (slot == -1) 505 return -ENOENT; 506 507 /* 508 * lpar doesn't use the passed actual page size 509 */ 510 pSeries_lpar_hpte_invalidate(slot, vpn, psize, 0, ssize, 0); 511 return 0; 512 } 513 514 /* 515 * Take a spinlock around flushes to avoid bouncing the hypervisor tlbie 516 * lock. 517 */ 518 static void pSeries_lpar_flush_hash_range(unsigned long number, int local) 519 { 520 unsigned long vpn; 521 unsigned long i, pix, rc; 522 unsigned long flags = 0; 523 struct ppc64_tlb_batch *batch = this_cpu_ptr(&ppc64_tlb_batch); 524 int lock_tlbie = !mmu_has_feature(MMU_FTR_LOCKLESS_TLBIE); 525 unsigned long param[9]; 526 unsigned long hash, index, shift, hidx, slot; 527 real_pte_t pte; 528 int psize, ssize; 529 530 if (lock_tlbie) 531 spin_lock_irqsave(&pSeries_lpar_tlbie_lock, flags); 532 533 psize = batch->psize; 534 ssize = batch->ssize; 535 pix = 0; 536 for (i = 0; i < number; i++) { 537 vpn = batch->vpn[i]; 538 pte = batch->pte[i]; 539 pte_iterate_hashed_subpages(pte, psize, vpn, index, shift) { 540 hash = hpt_hash(vpn, shift, ssize); 541 hidx = __rpte_to_hidx(pte, index); 542 if (hidx & _PTEIDX_SECONDARY) 543 hash = ~hash; 544 slot = (hash & htab_hash_mask) * HPTES_PER_GROUP; 545 slot += hidx & _PTEIDX_GROUP_IX; 546 if (!firmware_has_feature(FW_FEATURE_BULK_REMOVE)) { 547 /* 548 * lpar doesn't use the passed actual page size 549 */ 550 pSeries_lpar_hpte_invalidate(slot, vpn, psize, 551 0, ssize, local); 552 } else { 553 param[pix] = HBR_REQUEST | HBR_AVPN | slot; 554 param[pix+1] = hpte_encode_avpn(vpn, psize, 555 ssize); 556 pix += 2; 557 if (pix == 8) { 558 rc = plpar_hcall9(H_BULK_REMOVE, param, 559 param[0], param[1], param[2], 560 param[3], param[4], param[5], 561 param[6], param[7]); 562 BUG_ON(rc != H_SUCCESS); 563 pix = 0; 564 } 565 } 566 } pte_iterate_hashed_end(); 567 } 568 if (pix) { 569 param[pix] = HBR_END; 570 rc = plpar_hcall9(H_BULK_REMOVE, param, param[0], param[1], 571 param[2], param[3], param[4], param[5], 572 param[6], param[7]); 573 BUG_ON(rc != H_SUCCESS); 574 } 575 576 if (lock_tlbie) 577 spin_unlock_irqrestore(&pSeries_lpar_tlbie_lock, flags); 578 } 579 580 static int __init disable_bulk_remove(char *str) 581 { 582 if (strcmp(str, "off") == 0 && 583 firmware_has_feature(FW_FEATURE_BULK_REMOVE)) { 584 printk(KERN_INFO "Disabling BULK_REMOVE firmware feature"); 585 powerpc_firmware_features &= ~FW_FEATURE_BULK_REMOVE; 586 } 587 return 1; 588 } 589 590 __setup("bulk_remove=", disable_bulk_remove); 591 592 void __init hpte_init_pseries(void) 593 { 594 mmu_hash_ops.hpte_invalidate = pSeries_lpar_hpte_invalidate; 595 mmu_hash_ops.hpte_updatepp = pSeries_lpar_hpte_updatepp; 596 mmu_hash_ops.hpte_updateboltedpp = pSeries_lpar_hpte_updateboltedpp; 597 mmu_hash_ops.hpte_insert = pSeries_lpar_hpte_insert; 598 mmu_hash_ops.hpte_remove = pSeries_lpar_hpte_remove; 599 mmu_hash_ops.hpte_removebolted = pSeries_lpar_hpte_removebolted; 600 mmu_hash_ops.flush_hash_range = pSeries_lpar_flush_hash_range; 601 mmu_hash_ops.hpte_clear_all = pSeries_lpar_hptab_clear; 602 mmu_hash_ops.hugepage_invalidate = pSeries_lpar_hugepage_invalidate; 603 } 604 605 #ifdef CONFIG_PPC_SMLPAR 606 #define CMO_FREE_HINT_DEFAULT 1 607 static int cmo_free_hint_flag = CMO_FREE_HINT_DEFAULT; 608 609 static int __init cmo_free_hint(char *str) 610 { 611 char *parm; 612 parm = strstrip(str); 613 614 if (strcasecmp(parm, "no") == 0 || strcasecmp(parm, "off") == 0) { 615 printk(KERN_INFO "cmo_free_hint: CMO free page hinting is not active.\n"); 616 cmo_free_hint_flag = 0; 617 return 1; 618 } 619 620 cmo_free_hint_flag = 1; 621 printk(KERN_INFO "cmo_free_hint: CMO free page hinting is active.\n"); 622 623 if (strcasecmp(parm, "yes") == 0 || strcasecmp(parm, "on") == 0) 624 return 1; 625 626 return 0; 627 } 628 629 __setup("cmo_free_hint=", cmo_free_hint); 630 631 static void pSeries_set_page_state(struct page *page, int order, 632 unsigned long state) 633 { 634 int i, j; 635 unsigned long cmo_page_sz, addr; 636 637 cmo_page_sz = cmo_get_page_size(); 638 addr = __pa((unsigned long)page_address(page)); 639 640 for (i = 0; i < (1 << order); i++, addr += PAGE_SIZE) { 641 for (j = 0; j < PAGE_SIZE; j += cmo_page_sz) 642 plpar_hcall_norets(H_PAGE_INIT, state, addr + j, 0); 643 } 644 } 645 646 void arch_free_page(struct page *page, int order) 647 { 648 if (radix_enabled()) 649 return; 650 if (!cmo_free_hint_flag || !firmware_has_feature(FW_FEATURE_CMO)) 651 return; 652 653 pSeries_set_page_state(page, order, H_PAGE_SET_UNUSED); 654 } 655 EXPORT_SYMBOL(arch_free_page); 656 657 #endif /* CONFIG_PPC_SMLPAR */ 658 #endif /* CONFIG_PPC_STD_MMU_64 */ 659 660 #ifdef CONFIG_TRACEPOINTS 661 #ifdef HAVE_JUMP_LABEL 662 struct static_key hcall_tracepoint_key = STATIC_KEY_INIT; 663 664 void hcall_tracepoint_regfunc(void) 665 { 666 static_key_slow_inc(&hcall_tracepoint_key); 667 } 668 669 void hcall_tracepoint_unregfunc(void) 670 { 671 static_key_slow_dec(&hcall_tracepoint_key); 672 } 673 #else 674 /* 675 * We optimise our hcall path by placing hcall_tracepoint_refcount 676 * directly in the TOC so we can check if the hcall tracepoints are 677 * enabled via a single load. 678 */ 679 680 /* NB: reg/unreg are called while guarded with the tracepoints_mutex */ 681 extern long hcall_tracepoint_refcount; 682 683 void hcall_tracepoint_regfunc(void) 684 { 685 hcall_tracepoint_refcount++; 686 } 687 688 void hcall_tracepoint_unregfunc(void) 689 { 690 hcall_tracepoint_refcount--; 691 } 692 #endif 693 694 /* 695 * Since the tracing code might execute hcalls we need to guard against 696 * recursion. One example of this are spinlocks calling H_YIELD on 697 * shared processor partitions. 698 */ 699 static DEFINE_PER_CPU(unsigned int, hcall_trace_depth); 700 701 702 void __trace_hcall_entry(unsigned long opcode, unsigned long *args) 703 { 704 unsigned long flags; 705 unsigned int *depth; 706 707 /* 708 * We cannot call tracepoints inside RCU idle regions which 709 * means we must not trace H_CEDE. 710 */ 711 if (opcode == H_CEDE) 712 return; 713 714 local_irq_save(flags); 715 716 depth = this_cpu_ptr(&hcall_trace_depth); 717 718 if (*depth) 719 goto out; 720 721 (*depth)++; 722 preempt_disable(); 723 trace_hcall_entry(opcode, args); 724 (*depth)--; 725 726 out: 727 local_irq_restore(flags); 728 } 729 730 void __trace_hcall_exit(long opcode, unsigned long retval, 731 unsigned long *retbuf) 732 { 733 unsigned long flags; 734 unsigned int *depth; 735 736 if (opcode == H_CEDE) 737 return; 738 739 local_irq_save(flags); 740 741 depth = this_cpu_ptr(&hcall_trace_depth); 742 743 if (*depth) 744 goto out; 745 746 (*depth)++; 747 trace_hcall_exit(opcode, retval, retbuf); 748 preempt_enable(); 749 (*depth)--; 750 751 out: 752 local_irq_restore(flags); 753 } 754 #endif 755 756 /** 757 * h_get_mpp 758 * H_GET_MPP hcall returns info in 7 parms 759 */ 760 int h_get_mpp(struct hvcall_mpp_data *mpp_data) 761 { 762 int rc; 763 unsigned long retbuf[PLPAR_HCALL9_BUFSIZE]; 764 765 rc = plpar_hcall9(H_GET_MPP, retbuf); 766 767 mpp_data->entitled_mem = retbuf[0]; 768 mpp_data->mapped_mem = retbuf[1]; 769 770 mpp_data->group_num = (retbuf[2] >> 2 * 8) & 0xffff; 771 mpp_data->pool_num = retbuf[2] & 0xffff; 772 773 mpp_data->mem_weight = (retbuf[3] >> 7 * 8) & 0xff; 774 mpp_data->unallocated_mem_weight = (retbuf[3] >> 6 * 8) & 0xff; 775 mpp_data->unallocated_entitlement = retbuf[3] & 0xffffffffffffUL; 776 777 mpp_data->pool_size = retbuf[4]; 778 mpp_data->loan_request = retbuf[5]; 779 mpp_data->backing_mem = retbuf[6]; 780 781 return rc; 782 } 783 EXPORT_SYMBOL(h_get_mpp); 784 785 int h_get_mpp_x(struct hvcall_mpp_x_data *mpp_x_data) 786 { 787 int rc; 788 unsigned long retbuf[PLPAR_HCALL9_BUFSIZE] = { 0 }; 789 790 rc = plpar_hcall9(H_GET_MPP_X, retbuf); 791 792 mpp_x_data->coalesced_bytes = retbuf[0]; 793 mpp_x_data->pool_coalesced_bytes = retbuf[1]; 794 mpp_x_data->pool_purr_cycles = retbuf[2]; 795 mpp_x_data->pool_spurr_cycles = retbuf[3]; 796 797 return rc; 798 } 799