lpar.c revision 92c08a0d522c7e62c01a63e42597f0c2b02c4245
1/* 2 * pSeries_lpar.c 3 * Copyright (C) 2001 Todd Inglett, IBM Corporation 4 * 5 * pSeries LPAR support. 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License as published by 9 * the Free Software Foundation; either version 2 of the License, or 10 * (at your option) any later version. 11 * 12 * This program is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * GNU General Public License for more details. 16 * 17 * You should have received a copy of the GNU General Public License 18 * along with this program; if not, write to the Free Software 19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 20 */ 21 22/* Enables debugging of low-level hash table routines - careful! */ 23#undef DEBUG 24 25#include <linux/kernel.h> 26#include <linux/dma-mapping.h> 27#include <linux/console.h> 28#include <linux/export.h> 29#include <asm/processor.h> 30#include <asm/mmu.h> 31#include <asm/page.h> 32#include <asm/pgtable.h> 33#include <asm/machdep.h> 34#include <asm/mmu_context.h> 35#include <asm/iommu.h> 36#include <asm/tlbflush.h> 37#include <asm/tlb.h> 38#include <asm/prom.h> 39#include <asm/cputable.h> 40#include <asm/udbg.h> 41#include <asm/smp.h> 42#include <asm/trace.h> 43#include <asm/firmware.h> 44#include <asm/plpar_wrappers.h> 45 46#include "pseries.h" 47 48/* Flag bits for H_BULK_REMOVE */ 49#define HBR_REQUEST 0x4000000000000000UL 50#define HBR_RESPONSE 0x8000000000000000UL 51#define HBR_END 0xc000000000000000UL 52#define HBR_AVPN 0x0200000000000000UL 53#define HBR_ANDCOND 0x0100000000000000UL 54 55 56/* in hvCall.S */ 57EXPORT_SYMBOL(plpar_hcall); 58EXPORT_SYMBOL(plpar_hcall9); 59EXPORT_SYMBOL(plpar_hcall_norets); 60 61extern void pSeries_find_serial_port(void); 62 63void vpa_init(int cpu) 64{ 65 int hwcpu = get_hard_smp_processor_id(cpu); 66 unsigned long addr; 67 long ret; 68 struct paca_struct *pp; 69 struct dtl_entry *dtl; 70 71 /* 72 * The spec says it "may be problematic" if CPU x registers the VPA of 73 * CPU y. We should never do that, but wail if we ever do. 74 */ 75 WARN_ON(cpu != smp_processor_id()); 76 77 if (cpu_has_feature(CPU_FTR_ALTIVEC)) 78 lppaca_of(cpu).vmxregs_in_use = 1; 79 80 if (cpu_has_feature(CPU_FTR_ARCH_207S)) 81 lppaca_of(cpu).ebb_regs_in_use = 1; 82 83 addr = __pa(&lppaca_of(cpu)); 84 ret = register_vpa(hwcpu, addr); 85 86 if (ret) { 87 pr_err("WARNING: VPA registration for cpu %d (hw %d) of area " 88 "%lx failed with %ld\n", cpu, hwcpu, addr, ret); 89 return; 90 } 91 /* 92 * PAPR says this feature is SLB-Buffer but firmware never 93 * reports that. All SPLPAR support SLB shadow buffer. 94 */ 95 addr = __pa(paca[cpu].slb_shadow_ptr); 96 if (firmware_has_feature(FW_FEATURE_SPLPAR)) { 97 ret = register_slb_shadow(hwcpu, addr); 98 if (ret) 99 pr_err("WARNING: SLB shadow buffer registration for " 100 "cpu %d (hw %d) of area %lx failed with %ld\n", 101 cpu, hwcpu, addr, ret); 102 } 103 104 /* 105 * Register dispatch trace log, if one has been allocated. 106 */ 107 pp = &paca[cpu]; 108 dtl = pp->dispatch_log; 109 if (dtl) { 110 pp->dtl_ridx = 0; 111 pp->dtl_curr = dtl; 112 lppaca_of(cpu).dtl_idx = 0; 113 114 /* hypervisor reads buffer length from this field */ 115 dtl->enqueue_to_dispatch_time = cpu_to_be32(DISPATCH_LOG_BYTES); 116 ret = register_dtl(hwcpu, __pa(dtl)); 117 if (ret) 118 pr_err("WARNING: DTL registration of cpu %d (hw %d) " 119 "failed with %ld\n", smp_processor_id(), 120 hwcpu, ret); 121 lppaca_of(cpu).dtl_enable_mask = 2; 122 } 123} 124 125static long pSeries_lpar_hpte_insert(unsigned long hpte_group, 126 unsigned long vpn, unsigned long pa, 127 unsigned long rflags, unsigned long vflags, 128 int psize, int apsize, int ssize) 129{ 130 unsigned long lpar_rc; 131 unsigned long flags; 132 unsigned long slot; 133 unsigned long hpte_v, hpte_r; 134 135 if (!(vflags & HPTE_V_BOLTED)) 136 pr_devel("hpte_insert(group=%lx, vpn=%016lx, " 137 "pa=%016lx, rflags=%lx, vflags=%lx, psize=%d)\n", 138 hpte_group, vpn, pa, rflags, vflags, psize); 139 140 hpte_v = hpte_encode_v(vpn, psize, apsize, ssize) | vflags | HPTE_V_VALID; 141 hpte_r = hpte_encode_r(pa, psize, apsize) | rflags; 142 143 if (!(vflags & HPTE_V_BOLTED)) 144 pr_devel(" hpte_v=%016lx, hpte_r=%016lx\n", hpte_v, hpte_r); 145 146 /* Now fill in the actual HPTE */ 147 /* Set CEC cookie to 0 */ 148 /* Zero page = 0 */ 149 /* I-cache Invalidate = 0 */ 150 /* I-cache synchronize = 0 */ 151 /* Exact = 0 */ 152 flags = 0; 153 154 /* Make pHyp happy */ 155 if ((rflags & _PAGE_NO_CACHE) && !(rflags & _PAGE_WRITETHRU)) 156 hpte_r &= ~HPTE_R_M; 157 158 if (firmware_has_feature(FW_FEATURE_XCMO) && !(hpte_r & HPTE_R_N)) 159 flags |= H_COALESCE_CAND; 160 161 lpar_rc = plpar_pte_enter(flags, hpte_group, hpte_v, hpte_r, &slot); 162 if (unlikely(lpar_rc == H_PTEG_FULL)) { 163 if (!(vflags & HPTE_V_BOLTED)) 164 pr_devel(" full\n"); 165 return -1; 166 } 167 168 /* 169 * Since we try and ioremap PHBs we don't own, the pte insert 170 * will fail. However we must catch the failure in hash_page 171 * or we will loop forever, so return -2 in this case. 172 */ 173 if (unlikely(lpar_rc != H_SUCCESS)) { 174 if (!(vflags & HPTE_V_BOLTED)) 175 pr_devel(" lpar err %ld\n", lpar_rc); 176 return -2; 177 } 178 if (!(vflags & HPTE_V_BOLTED)) 179 pr_devel(" -> slot: %lu\n", slot & 7); 180 181 /* Because of iSeries, we have to pass down the secondary 182 * bucket bit here as well 183 */ 184 return (slot & 7) | (!!(vflags & HPTE_V_SECONDARY) << 3); 185} 186 187static DEFINE_SPINLOCK(pSeries_lpar_tlbie_lock); 188 189static long pSeries_lpar_hpte_remove(unsigned long hpte_group) 190{ 191 unsigned long slot_offset; 192 unsigned long lpar_rc; 193 int i; 194 unsigned long dummy1, dummy2; 195 196 /* pick a random slot to start at */ 197 slot_offset = mftb() & 0x7; 198 199 for (i = 0; i < HPTES_PER_GROUP; i++) { 200 201 /* don't remove a bolted entry */ 202 lpar_rc = plpar_pte_remove(H_ANDCOND, hpte_group + slot_offset, 203 (0x1UL << 4), &dummy1, &dummy2); 204 if (lpar_rc == H_SUCCESS) 205 return i; 206 207 /* 208 * The test for adjunct partition is performed before the 209 * ANDCOND test. H_RESOURCE may be returned, so we need to 210 * check for that as well. 211 */ 212 BUG_ON(lpar_rc != H_NOT_FOUND && lpar_rc != H_RESOURCE); 213 214 slot_offset++; 215 slot_offset &= 0x7; 216 } 217 218 return -1; 219} 220 221static void pSeries_lpar_hptab_clear(void) 222{ 223 unsigned long size_bytes = 1UL << ppc64_pft_size; 224 unsigned long hpte_count = size_bytes >> 4; 225 struct { 226 unsigned long pteh; 227 unsigned long ptel; 228 } ptes[4]; 229 long lpar_rc; 230 unsigned long i, j; 231 232 /* Read in batches of 4, 233 * invalidate only valid entries not in the VRMA 234 * hpte_count will be a multiple of 4 235 */ 236 for (i = 0; i < hpte_count; i += 4) { 237 lpar_rc = plpar_pte_read_4_raw(0, i, (void *)ptes); 238 if (lpar_rc != H_SUCCESS) 239 continue; 240 for (j = 0; j < 4; j++){ 241 if ((ptes[j].pteh & HPTE_V_VRMA_MASK) == 242 HPTE_V_VRMA_MASK) 243 continue; 244 if (ptes[j].pteh & HPTE_V_VALID) 245 plpar_pte_remove_raw(0, i + j, 0, 246 &(ptes[j].pteh), &(ptes[j].ptel)); 247 } 248 } 249 250#ifdef __LITTLE_ENDIAN__ 251 /* Reset exceptions to big endian */ 252 if (firmware_has_feature(FW_FEATURE_SET_MODE)) { 253 long rc; 254 255 rc = pseries_big_endian_exceptions(); 256 /* 257 * At this point it is unlikely panic() will get anything 258 * out to the user, but at least this will stop us from 259 * continuing on further and creating an even more 260 * difficult to debug situation. 261 */ 262 if (rc) 263 panic("Could not enable big endian exceptions"); 264 } 265#endif 266} 267 268/* 269 * NOTE: for updatepp ops we are fortunate that the linux "newpp" bits and 270 * the low 3 bits of flags happen to line up. So no transform is needed. 271 * We can probably optimize here and assume the high bits of newpp are 272 * already zero. For now I am paranoid. 273 */ 274static long pSeries_lpar_hpte_updatepp(unsigned long slot, 275 unsigned long newpp, 276 unsigned long vpn, 277 int psize, int apsize, 278 int ssize, int local) 279{ 280 unsigned long lpar_rc; 281 unsigned long flags = (newpp & 7) | H_AVPN; 282 unsigned long want_v; 283 284 want_v = hpte_encode_avpn(vpn, psize, ssize); 285 286 pr_devel(" update: avpnv=%016lx, hash=%016lx, f=%lx, psize: %d ...", 287 want_v, slot, flags, psize); 288 289 lpar_rc = plpar_pte_protect(flags, slot, want_v); 290 291 if (lpar_rc == H_NOT_FOUND) { 292 pr_devel("not found !\n"); 293 return -1; 294 } 295 296 pr_devel("ok\n"); 297 298 BUG_ON(lpar_rc != H_SUCCESS); 299 300 return 0; 301} 302 303static unsigned long pSeries_lpar_hpte_getword0(unsigned long slot) 304{ 305 unsigned long dword0; 306 unsigned long lpar_rc; 307 unsigned long dummy_word1; 308 unsigned long flags; 309 310 /* Read 1 pte at a time */ 311 /* Do not need RPN to logical page translation */ 312 /* No cross CEC PFT access */ 313 flags = 0; 314 315 lpar_rc = plpar_pte_read(flags, slot, &dword0, &dummy_word1); 316 317 BUG_ON(lpar_rc != H_SUCCESS); 318 319 return dword0; 320} 321 322static long pSeries_lpar_hpte_find(unsigned long vpn, int psize, int ssize) 323{ 324 unsigned long hash; 325 unsigned long i; 326 long slot; 327 unsigned long want_v, hpte_v; 328 329 hash = hpt_hash(vpn, mmu_psize_defs[psize].shift, ssize); 330 want_v = hpte_encode_avpn(vpn, psize, ssize); 331 332 /* Bolted entries are always in the primary group */ 333 slot = (hash & htab_hash_mask) * HPTES_PER_GROUP; 334 for (i = 0; i < HPTES_PER_GROUP; i++) { 335 hpte_v = pSeries_lpar_hpte_getword0(slot); 336 337 if (HPTE_V_COMPARE(hpte_v, want_v) && (hpte_v & HPTE_V_VALID)) 338 /* HPTE matches */ 339 return slot; 340 ++slot; 341 } 342 343 return -1; 344} 345 346static void pSeries_lpar_hpte_updateboltedpp(unsigned long newpp, 347 unsigned long ea, 348 int psize, int ssize) 349{ 350 unsigned long vpn; 351 unsigned long lpar_rc, slot, vsid, flags; 352 353 vsid = get_kernel_vsid(ea, ssize); 354 vpn = hpt_vpn(ea, vsid, ssize); 355 356 slot = pSeries_lpar_hpte_find(vpn, psize, ssize); 357 BUG_ON(slot == -1); 358 359 flags = newpp & 7; 360 lpar_rc = plpar_pte_protect(flags, slot, 0); 361 362 BUG_ON(lpar_rc != H_SUCCESS); 363} 364 365static void pSeries_lpar_hpte_invalidate(unsigned long slot, unsigned long vpn, 366 int psize, int apsize, 367 int ssize, int local) 368{ 369 unsigned long want_v; 370 unsigned long lpar_rc; 371 unsigned long dummy1, dummy2; 372 373 pr_devel(" inval : slot=%lx, vpn=%016lx, psize: %d, local: %d\n", 374 slot, vpn, psize, local); 375 376 want_v = hpte_encode_avpn(vpn, psize, ssize); 377 lpar_rc = plpar_pte_remove(H_AVPN, slot, want_v, &dummy1, &dummy2); 378 if (lpar_rc == H_NOT_FOUND) 379 return; 380 381 BUG_ON(lpar_rc != H_SUCCESS); 382} 383 384/* 385 * Limit iterations holding pSeries_lpar_tlbie_lock to 3. We also need 386 * to make sure that we avoid bouncing the hypervisor tlbie lock. 387 */ 388#define PPC64_HUGE_HPTE_BATCH 12 389 390static void __pSeries_lpar_hugepage_invalidate(unsigned long *slot, 391 unsigned long *vpn, int count, 392 int psize, int ssize) 393{ 394 unsigned long param[8]; 395 int i = 0, pix = 0, rc; 396 unsigned long flags = 0; 397 int lock_tlbie = !mmu_has_feature(MMU_FTR_LOCKLESS_TLBIE); 398 399 if (lock_tlbie) 400 spin_lock_irqsave(&pSeries_lpar_tlbie_lock, flags); 401 402 for (i = 0; i < count; i++) { 403 404 if (!firmware_has_feature(FW_FEATURE_BULK_REMOVE)) { 405 pSeries_lpar_hpte_invalidate(slot[i], vpn[i], psize, 0, 406 ssize, 0); 407 } else { 408 param[pix] = HBR_REQUEST | HBR_AVPN | slot[i]; 409 param[pix+1] = hpte_encode_avpn(vpn[i], psize, ssize); 410 pix += 2; 411 if (pix == 8) { 412 rc = plpar_hcall9(H_BULK_REMOVE, param, 413 param[0], param[1], param[2], 414 param[3], param[4], param[5], 415 param[6], param[7]); 416 BUG_ON(rc != H_SUCCESS); 417 pix = 0; 418 } 419 } 420 } 421 if (pix) { 422 param[pix] = HBR_END; 423 rc = plpar_hcall9(H_BULK_REMOVE, param, param[0], param[1], 424 param[2], param[3], param[4], param[5], 425 param[6], param[7]); 426 BUG_ON(rc != H_SUCCESS); 427 } 428 429 if (lock_tlbie) 430 spin_unlock_irqrestore(&pSeries_lpar_tlbie_lock, flags); 431} 432 433static void pSeries_lpar_hugepage_invalidate(struct mm_struct *mm, 434 unsigned char *hpte_slot_array, 435 unsigned long addr, int psize) 436{ 437 int ssize = 0, 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, vsid, 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 if (!is_kernel_addr(addr)) { 456 ssize = user_segment_size(addr); 457 vsid = get_vsid(mm->context.id, addr, ssize); 458 WARN_ON(vsid == 0); 459 } else { 460 vsid = get_kernel_vsid(addr, mmu_kernel_ssize); 461 ssize = mmu_kernel_ssize; 462 } 463 464 vpn = hpt_vpn(addr, vsid, ssize); 465 hash = hpt_hash(vpn, shift, ssize); 466 if (hidx & _PTEIDX_SECONDARY) 467 hash = ~hash; 468 469 slot = (hash & htab_hash_mask) * HPTES_PER_GROUP; 470 slot += hidx & _PTEIDX_GROUP_IX; 471 472 slot_array[index] = slot; 473 vpn_array[index] = vpn; 474 if (index == PPC64_HUGE_HPTE_BATCH - 1) { 475 /* 476 * Now do a bluk invalidate 477 */ 478 __pSeries_lpar_hugepage_invalidate(slot_array, 479 vpn_array, 480 PPC64_HUGE_HPTE_BATCH, 481 psize, ssize); 482 index = 0; 483 } else 484 index++; 485 } 486 if (index) 487 __pSeries_lpar_hugepage_invalidate(slot_array, vpn_array, 488 index, psize, ssize); 489} 490 491static void pSeries_lpar_hpte_removebolted(unsigned long ea, 492 int psize, int ssize) 493{ 494 unsigned long vpn; 495 unsigned long slot, vsid; 496 497 vsid = get_kernel_vsid(ea, ssize); 498 vpn = hpt_vpn(ea, vsid, ssize); 499 500 slot = pSeries_lpar_hpte_find(vpn, psize, ssize); 501 BUG_ON(slot == -1); 502 /* 503 * lpar doesn't use the passed actual page size 504 */ 505 pSeries_lpar_hpte_invalidate(slot, vpn, psize, 0, ssize, 0); 506} 507 508/* 509 * Take a spinlock around flushes to avoid bouncing the hypervisor tlbie 510 * lock. 511 */ 512static void pSeries_lpar_flush_hash_range(unsigned long number, int local) 513{ 514 unsigned long vpn; 515 unsigned long i, pix, rc; 516 unsigned long flags = 0; 517 struct ppc64_tlb_batch *batch = &__get_cpu_var(ppc64_tlb_batch); 518 int lock_tlbie = !mmu_has_feature(MMU_FTR_LOCKLESS_TLBIE); 519 unsigned long param[9]; 520 unsigned long hash, index, shift, hidx, slot; 521 real_pte_t pte; 522 int psize, ssize; 523 524 if (lock_tlbie) 525 spin_lock_irqsave(&pSeries_lpar_tlbie_lock, flags); 526 527 psize = batch->psize; 528 ssize = batch->ssize; 529 pix = 0; 530 for (i = 0; i < number; i++) { 531 vpn = batch->vpn[i]; 532 pte = batch->pte[i]; 533 pte_iterate_hashed_subpages(pte, psize, vpn, index, shift) { 534 hash = hpt_hash(vpn, shift, ssize); 535 hidx = __rpte_to_hidx(pte, index); 536 if (hidx & _PTEIDX_SECONDARY) 537 hash = ~hash; 538 slot = (hash & htab_hash_mask) * HPTES_PER_GROUP; 539 slot += hidx & _PTEIDX_GROUP_IX; 540 if (!firmware_has_feature(FW_FEATURE_BULK_REMOVE)) { 541 /* 542 * lpar doesn't use the passed actual page size 543 */ 544 pSeries_lpar_hpte_invalidate(slot, vpn, psize, 545 0, ssize, local); 546 } else { 547 param[pix] = HBR_REQUEST | HBR_AVPN | slot; 548 param[pix+1] = hpte_encode_avpn(vpn, psize, 549 ssize); 550 pix += 2; 551 if (pix == 8) { 552 rc = plpar_hcall9(H_BULK_REMOVE, param, 553 param[0], param[1], param[2], 554 param[3], param[4], param[5], 555 param[6], param[7]); 556 BUG_ON(rc != H_SUCCESS); 557 pix = 0; 558 } 559 } 560 } pte_iterate_hashed_end(); 561 } 562 if (pix) { 563 param[pix] = HBR_END; 564 rc = plpar_hcall9(H_BULK_REMOVE, param, param[0], param[1], 565 param[2], param[3], param[4], param[5], 566 param[6], param[7]); 567 BUG_ON(rc != H_SUCCESS); 568 } 569 570 if (lock_tlbie) 571 spin_unlock_irqrestore(&pSeries_lpar_tlbie_lock, flags); 572} 573 574static int __init disable_bulk_remove(char *str) 575{ 576 if (strcmp(str, "off") == 0 && 577 firmware_has_feature(FW_FEATURE_BULK_REMOVE)) { 578 printk(KERN_INFO "Disabling BULK_REMOVE firmware feature"); 579 powerpc_firmware_features &= ~FW_FEATURE_BULK_REMOVE; 580 } 581 return 1; 582} 583 584__setup("bulk_remove=", disable_bulk_remove); 585 586void __init hpte_init_lpar(void) 587{ 588 ppc_md.hpte_invalidate = pSeries_lpar_hpte_invalidate; 589 ppc_md.hpte_updatepp = pSeries_lpar_hpte_updatepp; 590 ppc_md.hpte_updateboltedpp = pSeries_lpar_hpte_updateboltedpp; 591 ppc_md.hpte_insert = pSeries_lpar_hpte_insert; 592 ppc_md.hpte_remove = pSeries_lpar_hpte_remove; 593 ppc_md.hpte_removebolted = pSeries_lpar_hpte_removebolted; 594 ppc_md.flush_hash_range = pSeries_lpar_flush_hash_range; 595 ppc_md.hpte_clear_all = pSeries_lpar_hptab_clear; 596 ppc_md.hugepage_invalidate = pSeries_lpar_hugepage_invalidate; 597} 598 599#ifdef CONFIG_PPC_SMLPAR 600#define CMO_FREE_HINT_DEFAULT 1 601static int cmo_free_hint_flag = CMO_FREE_HINT_DEFAULT; 602 603static int __init cmo_free_hint(char *str) 604{ 605 char *parm; 606 parm = strstrip(str); 607 608 if (strcasecmp(parm, "no") == 0 || strcasecmp(parm, "off") == 0) { 609 printk(KERN_INFO "cmo_free_hint: CMO free page hinting is not active.\n"); 610 cmo_free_hint_flag = 0; 611 return 1; 612 } 613 614 cmo_free_hint_flag = 1; 615 printk(KERN_INFO "cmo_free_hint: CMO free page hinting is active.\n"); 616 617 if (strcasecmp(parm, "yes") == 0 || strcasecmp(parm, "on") == 0) 618 return 1; 619 620 return 0; 621} 622 623__setup("cmo_free_hint=", cmo_free_hint); 624 625static void pSeries_set_page_state(struct page *page, int order, 626 unsigned long state) 627{ 628 int i, j; 629 unsigned long cmo_page_sz, addr; 630 631 cmo_page_sz = cmo_get_page_size(); 632 addr = __pa((unsigned long)page_address(page)); 633 634 for (i = 0; i < (1 << order); i++, addr += PAGE_SIZE) { 635 for (j = 0; j < PAGE_SIZE; j += cmo_page_sz) 636 plpar_hcall_norets(H_PAGE_INIT, state, addr + j, 0); 637 } 638} 639 640void arch_free_page(struct page *page, int order) 641{ 642 if (!cmo_free_hint_flag || !firmware_has_feature(FW_FEATURE_CMO)) 643 return; 644 645 pSeries_set_page_state(page, order, H_PAGE_SET_UNUSED); 646} 647EXPORT_SYMBOL(arch_free_page); 648 649#endif 650 651#ifdef CONFIG_TRACEPOINTS 652/* 653 * We optimise our hcall path by placing hcall_tracepoint_refcount 654 * directly in the TOC so we can check if the hcall tracepoints are 655 * enabled via a single load. 656 */ 657 658/* NB: reg/unreg are called while guarded with the tracepoints_mutex */ 659extern long hcall_tracepoint_refcount; 660 661/* 662 * Since the tracing code might execute hcalls we need to guard against 663 * recursion. One example of this are spinlocks calling H_YIELD on 664 * shared processor partitions. 665 */ 666static DEFINE_PER_CPU(unsigned int, hcall_trace_depth); 667 668void hcall_tracepoint_regfunc(void) 669{ 670 hcall_tracepoint_refcount++; 671} 672 673void hcall_tracepoint_unregfunc(void) 674{ 675 hcall_tracepoint_refcount--; 676} 677 678void __trace_hcall_entry(unsigned long opcode, unsigned long *args) 679{ 680 unsigned long flags; 681 unsigned int *depth; 682 683 /* 684 * We cannot call tracepoints inside RCU idle regions which 685 * means we must not trace H_CEDE. 686 */ 687 if (opcode == H_CEDE) 688 return; 689 690 local_irq_save(flags); 691 692 depth = &__get_cpu_var(hcall_trace_depth); 693 694 if (*depth) 695 goto out; 696 697 (*depth)++; 698 preempt_disable(); 699 trace_hcall_entry(opcode, args); 700 (*depth)--; 701 702out: 703 local_irq_restore(flags); 704} 705 706void __trace_hcall_exit(long opcode, unsigned long retval, 707 unsigned long *retbuf) 708{ 709 unsigned long flags; 710 unsigned int *depth; 711 712 if (opcode == H_CEDE) 713 return; 714 715 local_irq_save(flags); 716 717 depth = &__get_cpu_var(hcall_trace_depth); 718 719 if (*depth) 720 goto out; 721 722 (*depth)++; 723 trace_hcall_exit(opcode, retval, retbuf); 724 preempt_enable(); 725 (*depth)--; 726 727out: 728 local_irq_restore(flags); 729} 730#endif 731 732/** 733 * h_get_mpp 734 * H_GET_MPP hcall returns info in 7 parms 735 */ 736int h_get_mpp(struct hvcall_mpp_data *mpp_data) 737{ 738 int rc; 739 unsigned long retbuf[PLPAR_HCALL9_BUFSIZE]; 740 741 rc = plpar_hcall9(H_GET_MPP, retbuf); 742 743 mpp_data->entitled_mem = retbuf[0]; 744 mpp_data->mapped_mem = retbuf[1]; 745 746 mpp_data->group_num = (retbuf[2] >> 2 * 8) & 0xffff; 747 mpp_data->pool_num = retbuf[2] & 0xffff; 748 749 mpp_data->mem_weight = (retbuf[3] >> 7 * 8) & 0xff; 750 mpp_data->unallocated_mem_weight = (retbuf[3] >> 6 * 8) & 0xff; 751 mpp_data->unallocated_entitlement = retbuf[3] & 0xffffffffffffUL; 752 753 mpp_data->pool_size = retbuf[4]; 754 mpp_data->loan_request = retbuf[5]; 755 mpp_data->backing_mem = retbuf[6]; 756 757 return rc; 758} 759EXPORT_SYMBOL(h_get_mpp); 760 761int h_get_mpp_x(struct hvcall_mpp_x_data *mpp_x_data) 762{ 763 int rc; 764 unsigned long retbuf[PLPAR_HCALL9_BUFSIZE] = { 0 }; 765 766 rc = plpar_hcall9(H_GET_MPP_X, retbuf); 767 768 mpp_x_data->coalesced_bytes = retbuf[0]; 769 mpp_x_data->pool_coalesced_bytes = retbuf[1]; 770 mpp_x_data->pool_purr_cycles = retbuf[2]; 771 mpp_x_data->pool_spurr_cycles = retbuf[3]; 772 773 return rc; 774} 775