1 /* 2 * pSeries_lpar.c 3 * Copyright (C) 2001 Todd Inglett, IBM Corporation 4 * 5 * pSeries LPAR support. 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License as published by 9 * the Free Software Foundation; either version 2 of the License, or 10 * (at your option) any later version. 11 * 12 * This program is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * GNU General Public License for more details. 16 * 17 * You should have received a copy of the GNU General Public License 18 * along with this program; if not, write to the Free Software 19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 20 */ 21 22 /* Enables debugging of low-level hash table routines - careful! */ 23 #undef DEBUG 24 25 #include <linux/kernel.h> 26 #include <linux/dma-mapping.h> 27 #include <linux/console.h> 28 #include <linux/export.h> 29 #include <linux/static_key.h> 30 #include <asm/processor.h> 31 #include <asm/mmu.h> 32 #include <asm/page.h> 33 #include <asm/pgtable.h> 34 #include <asm/machdep.h> 35 #include <asm/mmu_context.h> 36 #include <asm/iommu.h> 37 #include <asm/tlbflush.h> 38 #include <asm/tlb.h> 39 #include <asm/prom.h> 40 #include <asm/cputable.h> 41 #include <asm/udbg.h> 42 #include <asm/smp.h> 43 #include <asm/trace.h> 44 #include <asm/firmware.h> 45 #include <asm/plpar_wrappers.h> 46 #include <asm/kexec.h> 47 #include <asm/fadump.h> 48 49 #include "pseries.h" 50 51 /* Flag bits for H_BULK_REMOVE */ 52 #define HBR_REQUEST 0x4000000000000000UL 53 #define HBR_RESPONSE 0x8000000000000000UL 54 #define HBR_END 0xc000000000000000UL 55 #define HBR_AVPN 0x0200000000000000UL 56 #define HBR_ANDCOND 0x0100000000000000UL 57 58 59 /* in hvCall.S */ 60 EXPORT_SYMBOL(plpar_hcall); 61 EXPORT_SYMBOL(plpar_hcall9); 62 EXPORT_SYMBOL(plpar_hcall_norets); 63 64 void vpa_init(int cpu) 65 { 66 int hwcpu = get_hard_smp_processor_id(cpu); 67 unsigned long addr; 68 long ret; 69 struct paca_struct *pp; 70 struct dtl_entry *dtl; 71 72 /* 73 * The spec says it "may be problematic" if CPU x registers the VPA of 74 * CPU y. We should never do that, but wail if we ever do. 75 */ 76 WARN_ON(cpu != smp_processor_id()); 77 78 if (cpu_has_feature(CPU_FTR_ALTIVEC)) 79 lppaca_of(cpu).vmxregs_in_use = 1; 80 81 if (cpu_has_feature(CPU_FTR_ARCH_207S)) 82 lppaca_of(cpu).ebb_regs_in_use = 1; 83 84 addr = __pa(&lppaca_of(cpu)); 85 ret = register_vpa(hwcpu, addr); 86 87 if (ret) { 88 pr_err("WARNING: VPA registration for cpu %d (hw %d) of area " 89 "%lx failed with %ld\n", cpu, hwcpu, addr, ret); 90 return; 91 } 92 /* 93 * PAPR says this feature is SLB-Buffer but firmware never 94 * reports that. All SPLPAR support SLB shadow buffer. 95 */ 96 addr = __pa(paca[cpu].slb_shadow_ptr); 97 if (firmware_has_feature(FW_FEATURE_SPLPAR)) { 98 ret = register_slb_shadow(hwcpu, addr); 99 if (ret) 100 pr_err("WARNING: SLB shadow buffer registration for " 101 "cpu %d (hw %d) of area %lx failed with %ld\n", 102 cpu, hwcpu, addr, ret); 103 } 104 105 /* 106 * Register dispatch trace log, if one has been allocated. 107 */ 108 pp = &paca[cpu]; 109 dtl = pp->dispatch_log; 110 if (dtl) { 111 pp->dtl_ridx = 0; 112 pp->dtl_curr = dtl; 113 lppaca_of(cpu).dtl_idx = 0; 114 115 /* hypervisor reads buffer length from this field */ 116 dtl->enqueue_to_dispatch_time = cpu_to_be32(DISPATCH_LOG_BYTES); 117 ret = register_dtl(hwcpu, __pa(dtl)); 118 if (ret) 119 pr_err("WARNING: DTL registration of cpu %d (hw %d) " 120 "failed with %ld\n", smp_processor_id(), 121 hwcpu, ret); 122 lppaca_of(cpu).dtl_enable_mask = 2; 123 } 124 } 125 126 static long pSeries_lpar_hpte_insert(unsigned long hpte_group, 127 unsigned long vpn, unsigned long pa, 128 unsigned long rflags, unsigned long vflags, 129 int psize, int apsize, int ssize) 130 { 131 unsigned long lpar_rc; 132 unsigned long flags; 133 unsigned long slot; 134 unsigned long hpte_v, hpte_r; 135 136 if (!(vflags & HPTE_V_BOLTED)) 137 pr_devel("hpte_insert(group=%lx, vpn=%016lx, " 138 "pa=%016lx, rflags=%lx, vflags=%lx, psize=%d)\n", 139 hpte_group, vpn, pa, rflags, vflags, psize); 140 141 hpte_v = hpte_encode_v(vpn, psize, apsize, ssize) | vflags | HPTE_V_VALID; 142 hpte_r = hpte_encode_r(pa, psize, apsize) | rflags; 143 144 if (!(vflags & HPTE_V_BOLTED)) 145 pr_devel(" hpte_v=%016lx, hpte_r=%016lx\n", hpte_v, hpte_r); 146 147 /* Now fill in the actual HPTE */ 148 /* Set CEC cookie to 0 */ 149 /* Zero page = 0 */ 150 /* I-cache Invalidate = 0 */ 151 /* I-cache synchronize = 0 */ 152 /* Exact = 0 */ 153 flags = 0; 154 155 /* Make pHyp happy */ 156 if ((rflags & _PAGE_NO_CACHE) && !(rflags & _PAGE_WRITETHRU)) 157 hpte_r &= ~HPTE_R_M; 158 159 if (firmware_has_feature(FW_FEATURE_XCMO) && !(hpte_r & HPTE_R_N)) 160 flags |= H_COALESCE_CAND; 161 162 lpar_rc = plpar_pte_enter(flags, hpte_group, hpte_v, hpte_r, &slot); 163 if (unlikely(lpar_rc == H_PTEG_FULL)) { 164 if (!(vflags & HPTE_V_BOLTED)) 165 pr_devel(" full\n"); 166 return -1; 167 } 168 169 /* 170 * Since we try and ioremap PHBs we don't own, the pte insert 171 * will fail. However we must catch the failure in hash_page 172 * or we will loop forever, so return -2 in this case. 173 */ 174 if (unlikely(lpar_rc != H_SUCCESS)) { 175 if (!(vflags & HPTE_V_BOLTED)) 176 pr_devel(" lpar err %ld\n", lpar_rc); 177 return -2; 178 } 179 if (!(vflags & HPTE_V_BOLTED)) 180 pr_devel(" -> slot: %lu\n", slot & 7); 181 182 /* Because of iSeries, we have to pass down the secondary 183 * bucket bit here as well 184 */ 185 return (slot & 7) | (!!(vflags & HPTE_V_SECONDARY) << 3); 186 } 187 188 static DEFINE_SPINLOCK(pSeries_lpar_tlbie_lock); 189 190 static long pSeries_lpar_hpte_remove(unsigned long hpte_group) 191 { 192 unsigned long slot_offset; 193 unsigned long lpar_rc; 194 int i; 195 unsigned long dummy1, dummy2; 196 197 /* pick a random slot to start at */ 198 slot_offset = mftb() & 0x7; 199 200 for (i = 0; i < HPTES_PER_GROUP; i++) { 201 202 /* don't remove a bolted entry */ 203 lpar_rc = plpar_pte_remove(H_ANDCOND, hpte_group + slot_offset, 204 (0x1UL << 4), &dummy1, &dummy2); 205 if (lpar_rc == H_SUCCESS) 206 return i; 207 208 /* 209 * The test for adjunct partition is performed before the 210 * ANDCOND test. H_RESOURCE may be returned, so we need to 211 * check for that as well. 212 */ 213 BUG_ON(lpar_rc != H_NOT_FOUND && lpar_rc != H_RESOURCE); 214 215 slot_offset++; 216 slot_offset &= 0x7; 217 } 218 219 return -1; 220 } 221 222 static void pSeries_lpar_hptab_clear(void) 223 { 224 unsigned long size_bytes = 1UL << ppc64_pft_size; 225 unsigned long hpte_count = size_bytes >> 4; 226 struct { 227 unsigned long pteh; 228 unsigned long ptel; 229 } ptes[4]; 230 long lpar_rc; 231 unsigned long i, j; 232 233 /* Read in batches of 4, 234 * invalidate only valid entries not in the VRMA 235 * hpte_count will be a multiple of 4 236 */ 237 for (i = 0; i < hpte_count; i += 4) { 238 lpar_rc = plpar_pte_read_4_raw(0, i, (void *)ptes); 239 if (lpar_rc != H_SUCCESS) 240 continue; 241 for (j = 0; j < 4; j++){ 242 if ((ptes[j].pteh & HPTE_V_VRMA_MASK) == 243 HPTE_V_VRMA_MASK) 244 continue; 245 if (ptes[j].pteh & HPTE_V_VALID) 246 plpar_pte_remove_raw(0, i + j, 0, 247 &(ptes[j].pteh), &(ptes[j].ptel)); 248 } 249 } 250 251 #ifdef __LITTLE_ENDIAN__ 252 /* 253 * Reset exceptions to big endian. 254 * 255 * FIXME this is a hack for kexec, we need to reset the exception 256 * endian before starting the new kernel and this is a convenient place 257 * to do it. 258 * 259 * This is also called on boot when a fadump happens. In that case we 260 * must not change the exception endian mode. 261 */ 262 if (firmware_has_feature(FW_FEATURE_SET_MODE) && !is_fadump_active()) { 263 long rc; 264 265 rc = pseries_big_endian_exceptions(); 266 /* 267 * At this point it is unlikely panic() will get anything 268 * out to the user, but at least this will stop us from 269 * continuing on further and creating an even more 270 * difficult to debug situation. 271 * 272 * There is a known problem when kdump'ing, if cpus are offline 273 * the above call will fail. Rather than panicking again, keep 274 * going and hope the kdump kernel is also little endian, which 275 * it usually is. 276 */ 277 if (rc && !kdump_in_progress()) 278 panic("Could not enable big endian exceptions"); 279 } 280 #endif 281 } 282 283 /* 284 * NOTE: for updatepp ops we are fortunate that the linux "newpp" bits and 285 * the low 3 bits of flags happen to line up. So no transform is needed. 286 * We can probably optimize here and assume the high bits of newpp are 287 * already zero. For now I am paranoid. 288 */ 289 static long pSeries_lpar_hpte_updatepp(unsigned long slot, 290 unsigned long newpp, 291 unsigned long vpn, 292 int psize, int apsize, 293 int ssize, unsigned long inv_flags) 294 { 295 unsigned long lpar_rc; 296 unsigned long flags = (newpp & 7) | H_AVPN; 297 unsigned long want_v; 298 299 want_v = hpte_encode_avpn(vpn, psize, ssize); 300 301 pr_devel(" update: avpnv=%016lx, hash=%016lx, f=%lx, psize: %d ...", 302 want_v, slot, flags, psize); 303 304 lpar_rc = plpar_pte_protect(flags, slot, want_v); 305 306 if (lpar_rc == H_NOT_FOUND) { 307 pr_devel("not found !\n"); 308 return -1; 309 } 310 311 pr_devel("ok\n"); 312 313 BUG_ON(lpar_rc != H_SUCCESS); 314 315 return 0; 316 } 317 318 static unsigned long pSeries_lpar_hpte_getword0(unsigned long slot) 319 { 320 unsigned long dword0; 321 unsigned long lpar_rc; 322 unsigned long dummy_word1; 323 unsigned long flags; 324 325 /* Read 1 pte at a time */ 326 /* Do not need RPN to logical page translation */ 327 /* No cross CEC PFT access */ 328 flags = 0; 329 330 lpar_rc = plpar_pte_read(flags, slot, &dword0, &dummy_word1); 331 332 BUG_ON(lpar_rc != H_SUCCESS); 333 334 return dword0; 335 } 336 337 static long pSeries_lpar_hpte_find(unsigned long vpn, int psize, int ssize) 338 { 339 unsigned long hash; 340 unsigned long i; 341 long slot; 342 unsigned long want_v, hpte_v; 343 344 hash = hpt_hash(vpn, mmu_psize_defs[psize].shift, ssize); 345 want_v = hpte_encode_avpn(vpn, psize, ssize); 346 347 /* Bolted entries are always in the primary group */ 348 slot = (hash & htab_hash_mask) * HPTES_PER_GROUP; 349 for (i = 0; i < HPTES_PER_GROUP; i++) { 350 hpte_v = pSeries_lpar_hpte_getword0(slot); 351 352 if (HPTE_V_COMPARE(hpte_v, want_v) && (hpte_v & HPTE_V_VALID)) 353 /* HPTE matches */ 354 return slot; 355 ++slot; 356 } 357 358 return -1; 359 } 360 361 static void pSeries_lpar_hpte_updateboltedpp(unsigned long newpp, 362 unsigned long ea, 363 int psize, int ssize) 364 { 365 unsigned long vpn; 366 unsigned long lpar_rc, slot, vsid, flags; 367 368 vsid = get_kernel_vsid(ea, ssize); 369 vpn = hpt_vpn(ea, vsid, ssize); 370 371 slot = pSeries_lpar_hpte_find(vpn, psize, ssize); 372 BUG_ON(slot == -1); 373 374 flags = newpp & 7; 375 lpar_rc = plpar_pte_protect(flags, slot, 0); 376 377 BUG_ON(lpar_rc != H_SUCCESS); 378 } 379 380 static void pSeries_lpar_hpte_invalidate(unsigned long slot, unsigned long vpn, 381 int psize, int apsize, 382 int ssize, int local) 383 { 384 unsigned long want_v; 385 unsigned long lpar_rc; 386 unsigned long dummy1, dummy2; 387 388 pr_devel(" inval : slot=%lx, vpn=%016lx, psize: %d, local: %d\n", 389 slot, vpn, psize, local); 390 391 want_v = hpte_encode_avpn(vpn, psize, ssize); 392 lpar_rc = plpar_pte_remove(H_AVPN, slot, want_v, &dummy1, &dummy2); 393 if (lpar_rc == H_NOT_FOUND) 394 return; 395 396 BUG_ON(lpar_rc != H_SUCCESS); 397 } 398 399 /* 400 * Limit iterations holding pSeries_lpar_tlbie_lock to 3. We also need 401 * to make sure that we avoid bouncing the hypervisor tlbie lock. 402 */ 403 #define PPC64_HUGE_HPTE_BATCH 12 404 405 static void __pSeries_lpar_hugepage_invalidate(unsigned long *slot, 406 unsigned long *vpn, int count, 407 int psize, int ssize) 408 { 409 unsigned long param[8]; 410 int i = 0, pix = 0, rc; 411 unsigned long flags = 0; 412 int lock_tlbie = !mmu_has_feature(MMU_FTR_LOCKLESS_TLBIE); 413 414 if (lock_tlbie) 415 spin_lock_irqsave(&pSeries_lpar_tlbie_lock, flags); 416 417 for (i = 0; i < count; i++) { 418 419 if (!firmware_has_feature(FW_FEATURE_BULK_REMOVE)) { 420 pSeries_lpar_hpte_invalidate(slot[i], vpn[i], psize, 0, 421 ssize, 0); 422 } else { 423 param[pix] = HBR_REQUEST | HBR_AVPN | slot[i]; 424 param[pix+1] = hpte_encode_avpn(vpn[i], psize, ssize); 425 pix += 2; 426 if (pix == 8) { 427 rc = plpar_hcall9(H_BULK_REMOVE, param, 428 param[0], param[1], param[2], 429 param[3], param[4], param[5], 430 param[6], param[7]); 431 BUG_ON(rc != H_SUCCESS); 432 pix = 0; 433 } 434 } 435 } 436 if (pix) { 437 param[pix] = HBR_END; 438 rc = plpar_hcall9(H_BULK_REMOVE, param, param[0], param[1], 439 param[2], param[3], param[4], param[5], 440 param[6], param[7]); 441 BUG_ON(rc != H_SUCCESS); 442 } 443 444 if (lock_tlbie) 445 spin_unlock_irqrestore(&pSeries_lpar_tlbie_lock, flags); 446 } 447 448 static void pSeries_lpar_hugepage_invalidate(unsigned long vsid, 449 unsigned long addr, 450 unsigned char *hpte_slot_array, 451 int psize, int ssize, int local) 452 { 453 int i, index = 0; 454 unsigned long s_addr = addr; 455 unsigned int max_hpte_count, valid; 456 unsigned long vpn_array[PPC64_HUGE_HPTE_BATCH]; 457 unsigned long slot_array[PPC64_HUGE_HPTE_BATCH]; 458 unsigned long shift, hidx, vpn = 0, hash, slot; 459 460 shift = mmu_psize_defs[psize].shift; 461 max_hpte_count = 1U << (PMD_SHIFT - shift); 462 463 for (i = 0; i < max_hpte_count; i++) { 464 valid = hpte_valid(hpte_slot_array, i); 465 if (!valid) 466 continue; 467 hidx = hpte_hash_index(hpte_slot_array, i); 468 469 /* get the vpn */ 470 addr = s_addr + (i * (1ul << shift)); 471 vpn = hpt_vpn(addr, vsid, ssize); 472 hash = hpt_hash(vpn, shift, ssize); 473 if (hidx & _PTEIDX_SECONDARY) 474 hash = ~hash; 475 476 slot = (hash & htab_hash_mask) * HPTES_PER_GROUP; 477 slot += hidx & _PTEIDX_GROUP_IX; 478 479 slot_array[index] = slot; 480 vpn_array[index] = vpn; 481 if (index == PPC64_HUGE_HPTE_BATCH - 1) { 482 /* 483 * Now do a bluk invalidate 484 */ 485 __pSeries_lpar_hugepage_invalidate(slot_array, 486 vpn_array, 487 PPC64_HUGE_HPTE_BATCH, 488 psize, ssize); 489 index = 0; 490 } else 491 index++; 492 } 493 if (index) 494 __pSeries_lpar_hugepage_invalidate(slot_array, vpn_array, 495 index, psize, ssize); 496 } 497 498 static void pSeries_lpar_hpte_removebolted(unsigned long ea, 499 int psize, int ssize) 500 { 501 unsigned long vpn; 502 unsigned long slot, vsid; 503 504 vsid = get_kernel_vsid(ea, ssize); 505 vpn = hpt_vpn(ea, vsid, ssize); 506 507 slot = pSeries_lpar_hpte_find(vpn, psize, ssize); 508 BUG_ON(slot == -1); 509 /* 510 * lpar doesn't use the passed actual page size 511 */ 512 pSeries_lpar_hpte_invalidate(slot, vpn, psize, 0, ssize, 0); 513 } 514 515 /* 516 * Take a spinlock around flushes to avoid bouncing the hypervisor tlbie 517 * lock. 518 */ 519 static void pSeries_lpar_flush_hash_range(unsigned long number, int local) 520 { 521 unsigned long vpn; 522 unsigned long i, pix, rc; 523 unsigned long flags = 0; 524 struct ppc64_tlb_batch *batch = this_cpu_ptr(&ppc64_tlb_batch); 525 int lock_tlbie = !mmu_has_feature(MMU_FTR_LOCKLESS_TLBIE); 526 unsigned long param[9]; 527 unsigned long hash, index, shift, hidx, slot; 528 real_pte_t pte; 529 int psize, ssize; 530 531 if (lock_tlbie) 532 spin_lock_irqsave(&pSeries_lpar_tlbie_lock, flags); 533 534 psize = batch->psize; 535 ssize = batch->ssize; 536 pix = 0; 537 for (i = 0; i < number; i++) { 538 vpn = batch->vpn[i]; 539 pte = batch->pte[i]; 540 pte_iterate_hashed_subpages(pte, psize, vpn, index, shift) { 541 hash = hpt_hash(vpn, shift, ssize); 542 hidx = __rpte_to_hidx(pte, index); 543 if (hidx & _PTEIDX_SECONDARY) 544 hash = ~hash; 545 slot = (hash & htab_hash_mask) * HPTES_PER_GROUP; 546 slot += hidx & _PTEIDX_GROUP_IX; 547 if (!firmware_has_feature(FW_FEATURE_BULK_REMOVE)) { 548 /* 549 * lpar doesn't use the passed actual page size 550 */ 551 pSeries_lpar_hpte_invalidate(slot, vpn, psize, 552 0, ssize, local); 553 } else { 554 param[pix] = HBR_REQUEST | HBR_AVPN | slot; 555 param[pix+1] = hpte_encode_avpn(vpn, psize, 556 ssize); 557 pix += 2; 558 if (pix == 8) { 559 rc = plpar_hcall9(H_BULK_REMOVE, param, 560 param[0], param[1], param[2], 561 param[3], param[4], param[5], 562 param[6], param[7]); 563 BUG_ON(rc != H_SUCCESS); 564 pix = 0; 565 } 566 } 567 } pte_iterate_hashed_end(); 568 } 569 if (pix) { 570 param[pix] = HBR_END; 571 rc = plpar_hcall9(H_BULK_REMOVE, param, param[0], param[1], 572 param[2], param[3], param[4], param[5], 573 param[6], param[7]); 574 BUG_ON(rc != H_SUCCESS); 575 } 576 577 if (lock_tlbie) 578 spin_unlock_irqrestore(&pSeries_lpar_tlbie_lock, flags); 579 } 580 581 static int __init disable_bulk_remove(char *str) 582 { 583 if (strcmp(str, "off") == 0 && 584 firmware_has_feature(FW_FEATURE_BULK_REMOVE)) { 585 printk(KERN_INFO "Disabling BULK_REMOVE firmware feature"); 586 powerpc_firmware_features &= ~FW_FEATURE_BULK_REMOVE; 587 } 588 return 1; 589 } 590 591 __setup("bulk_remove=", disable_bulk_remove); 592 593 void __init hpte_init_lpar(void) 594 { 595 ppc_md.hpte_invalidate = pSeries_lpar_hpte_invalidate; 596 ppc_md.hpte_updatepp = pSeries_lpar_hpte_updatepp; 597 ppc_md.hpte_updateboltedpp = pSeries_lpar_hpte_updateboltedpp; 598 ppc_md.hpte_insert = pSeries_lpar_hpte_insert; 599 ppc_md.hpte_remove = pSeries_lpar_hpte_remove; 600 ppc_md.hpte_removebolted = pSeries_lpar_hpte_removebolted; 601 ppc_md.flush_hash_range = pSeries_lpar_flush_hash_range; 602 ppc_md.hpte_clear_all = pSeries_lpar_hptab_clear; 603 ppc_md.hugepage_invalidate = pSeries_lpar_hugepage_invalidate; 604 } 605 606 #ifdef CONFIG_PPC_SMLPAR 607 #define CMO_FREE_HINT_DEFAULT 1 608 static int cmo_free_hint_flag = CMO_FREE_HINT_DEFAULT; 609 610 static int __init cmo_free_hint(char *str) 611 { 612 char *parm; 613 parm = strstrip(str); 614 615 if (strcasecmp(parm, "no") == 0 || strcasecmp(parm, "off") == 0) { 616 printk(KERN_INFO "cmo_free_hint: CMO free page hinting is not active.\n"); 617 cmo_free_hint_flag = 0; 618 return 1; 619 } 620 621 cmo_free_hint_flag = 1; 622 printk(KERN_INFO "cmo_free_hint: CMO free page hinting is active.\n"); 623 624 if (strcasecmp(parm, "yes") == 0 || strcasecmp(parm, "on") == 0) 625 return 1; 626 627 return 0; 628 } 629 630 __setup("cmo_free_hint=", cmo_free_hint); 631 632 static void pSeries_set_page_state(struct page *page, int order, 633 unsigned long state) 634 { 635 int i, j; 636 unsigned long cmo_page_sz, addr; 637 638 cmo_page_sz = cmo_get_page_size(); 639 addr = __pa((unsigned long)page_address(page)); 640 641 for (i = 0; i < (1 << order); i++, addr += PAGE_SIZE) { 642 for (j = 0; j < PAGE_SIZE; j += cmo_page_sz) 643 plpar_hcall_norets(H_PAGE_INIT, state, addr + j, 0); 644 } 645 } 646 647 void arch_free_page(struct page *page, int order) 648 { 649 if (!cmo_free_hint_flag || !firmware_has_feature(FW_FEATURE_CMO)) 650 return; 651 652 pSeries_set_page_state(page, order, H_PAGE_SET_UNUSED); 653 } 654 EXPORT_SYMBOL(arch_free_page); 655 656 #endif 657 658 #ifdef CONFIG_TRACEPOINTS 659 #ifdef HAVE_JUMP_LABEL 660 struct static_key hcall_tracepoint_key = STATIC_KEY_INIT; 661 662 void hcall_tracepoint_regfunc(void) 663 { 664 static_key_slow_inc(&hcall_tracepoint_key); 665 } 666 667 void hcall_tracepoint_unregfunc(void) 668 { 669 static_key_slow_dec(&hcall_tracepoint_key); 670 } 671 #else 672 /* 673 * We optimise our hcall path by placing hcall_tracepoint_refcount 674 * directly in the TOC so we can check if the hcall tracepoints are 675 * enabled via a single load. 676 */ 677 678 /* NB: reg/unreg are called while guarded with the tracepoints_mutex */ 679 extern long hcall_tracepoint_refcount; 680 681 void hcall_tracepoint_regfunc(void) 682 { 683 hcall_tracepoint_refcount++; 684 } 685 686 void hcall_tracepoint_unregfunc(void) 687 { 688 hcall_tracepoint_refcount--; 689 } 690 #endif 691 692 /* 693 * Since the tracing code might execute hcalls we need to guard against 694 * recursion. One example of this are spinlocks calling H_YIELD on 695 * shared processor partitions. 696 */ 697 static DEFINE_PER_CPU(unsigned int, hcall_trace_depth); 698 699 700 void __trace_hcall_entry(unsigned long opcode, unsigned long *args) 701 { 702 unsigned long flags; 703 unsigned int *depth; 704 705 /* 706 * We cannot call tracepoints inside RCU idle regions which 707 * means we must not trace H_CEDE. 708 */ 709 if (opcode == H_CEDE) 710 return; 711 712 local_irq_save(flags); 713 714 depth = this_cpu_ptr(&hcall_trace_depth); 715 716 if (*depth) 717 goto out; 718 719 (*depth)++; 720 preempt_disable(); 721 trace_hcall_entry(opcode, args); 722 (*depth)--; 723 724 out: 725 local_irq_restore(flags); 726 } 727 728 void __trace_hcall_exit(long opcode, unsigned long retval, 729 unsigned long *retbuf) 730 { 731 unsigned long flags; 732 unsigned int *depth; 733 734 if (opcode == H_CEDE) 735 return; 736 737 local_irq_save(flags); 738 739 depth = this_cpu_ptr(&hcall_trace_depth); 740 741 if (*depth) 742 goto out; 743 744 (*depth)++; 745 trace_hcall_exit(opcode, retval, retbuf); 746 preempt_enable(); 747 (*depth)--; 748 749 out: 750 local_irq_restore(flags); 751 } 752 #endif 753 754 /** 755 * h_get_mpp 756 * H_GET_MPP hcall returns info in 7 parms 757 */ 758 int h_get_mpp(struct hvcall_mpp_data *mpp_data) 759 { 760 int rc; 761 unsigned long retbuf[PLPAR_HCALL9_BUFSIZE]; 762 763 rc = plpar_hcall9(H_GET_MPP, retbuf); 764 765 mpp_data->entitled_mem = retbuf[0]; 766 mpp_data->mapped_mem = retbuf[1]; 767 768 mpp_data->group_num = (retbuf[2] >> 2 * 8) & 0xffff; 769 mpp_data->pool_num = retbuf[2] & 0xffff; 770 771 mpp_data->mem_weight = (retbuf[3] >> 7 * 8) & 0xff; 772 mpp_data->unallocated_mem_weight = (retbuf[3] >> 6 * 8) & 0xff; 773 mpp_data->unallocated_entitlement = retbuf[3] & 0xffffffffffffUL; 774 775 mpp_data->pool_size = retbuf[4]; 776 mpp_data->loan_request = retbuf[5]; 777 mpp_data->backing_mem = retbuf[6]; 778 779 return rc; 780 } 781 EXPORT_SYMBOL(h_get_mpp); 782 783 int h_get_mpp_x(struct hvcall_mpp_x_data *mpp_x_data) 784 { 785 int rc; 786 unsigned long retbuf[PLPAR_HCALL9_BUFSIZE] = { 0 }; 787 788 rc = plpar_hcall9(H_GET_MPP_X, retbuf); 789 790 mpp_x_data->coalesced_bytes = retbuf[0]; 791 mpp_x_data->pool_coalesced_bytes = retbuf[1]; 792 mpp_x_data->pool_purr_cycles = retbuf[2]; 793 mpp_x_data->pool_spurr_cycles = retbuf[3]; 794 795 return rc; 796 } 797