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 extern void pSeries_find_serial_port(void); 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 /* Reset exceptions to big endian */ 253 if (firmware_has_feature(FW_FEATURE_SET_MODE)) { 254 long rc; 255 256 rc = pseries_big_endian_exceptions(); 257 /* 258 * At this point it is unlikely panic() will get anything 259 * out to the user, but at least this will stop us from 260 * continuing on further and creating an even more 261 * difficult to debug situation. 262 */ 263 if (rc) 264 panic("Could not enable big endian exceptions"); 265 } 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, int local) 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 unsigned long pSeries_lpar_hpte_getword0(unsigned long slot) 305 { 306 unsigned long dword0; 307 unsigned long lpar_rc; 308 unsigned long dummy_word1; 309 unsigned long flags; 310 311 /* Read 1 pte at a time */ 312 /* Do not need RPN to logical page translation */ 313 /* No cross CEC PFT access */ 314 flags = 0; 315 316 lpar_rc = plpar_pte_read(flags, slot, &dword0, &dummy_word1); 317 318 BUG_ON(lpar_rc != H_SUCCESS); 319 320 return dword0; 321 } 322 323 static long pSeries_lpar_hpte_find(unsigned long vpn, int psize, int ssize) 324 { 325 unsigned long hash; 326 unsigned long i; 327 long slot; 328 unsigned long want_v, hpte_v; 329 330 hash = hpt_hash(vpn, mmu_psize_defs[psize].shift, ssize); 331 want_v = hpte_encode_avpn(vpn, psize, ssize); 332 333 /* Bolted entries are always in the primary group */ 334 slot = (hash & htab_hash_mask) * HPTES_PER_GROUP; 335 for (i = 0; i < HPTES_PER_GROUP; i++) { 336 hpte_v = pSeries_lpar_hpte_getword0(slot); 337 338 if (HPTE_V_COMPARE(hpte_v, want_v) && (hpte_v & HPTE_V_VALID)) 339 /* HPTE matches */ 340 return slot; 341 ++slot; 342 } 343 344 return -1; 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 /* 386 * Limit iterations holding pSeries_lpar_tlbie_lock to 3. We also need 387 * to make sure that we avoid bouncing the hypervisor tlbie lock. 388 */ 389 #define PPC64_HUGE_HPTE_BATCH 12 390 391 static void __pSeries_lpar_hugepage_invalidate(unsigned long *slot, 392 unsigned long *vpn, int count, 393 int psize, int ssize) 394 { 395 unsigned long param[8]; 396 int i = 0, pix = 0, rc; 397 unsigned long flags = 0; 398 int lock_tlbie = !mmu_has_feature(MMU_FTR_LOCKLESS_TLBIE); 399 400 if (lock_tlbie) 401 spin_lock_irqsave(&pSeries_lpar_tlbie_lock, flags); 402 403 for (i = 0; i < count; i++) { 404 405 if (!firmware_has_feature(FW_FEATURE_BULK_REMOVE)) { 406 pSeries_lpar_hpte_invalidate(slot[i], vpn[i], psize, 0, 407 ssize, 0); 408 } else { 409 param[pix] = HBR_REQUEST | HBR_AVPN | slot[i]; 410 param[pix+1] = hpte_encode_avpn(vpn[i], psize, ssize); 411 pix += 2; 412 if (pix == 8) { 413 rc = plpar_hcall9(H_BULK_REMOVE, param, 414 param[0], param[1], param[2], 415 param[3], param[4], param[5], 416 param[6], param[7]); 417 BUG_ON(rc != H_SUCCESS); 418 pix = 0; 419 } 420 } 421 } 422 if (pix) { 423 param[pix] = HBR_END; 424 rc = plpar_hcall9(H_BULK_REMOVE, param, param[0], param[1], 425 param[2], param[3], param[4], param[5], 426 param[6], param[7]); 427 BUG_ON(rc != H_SUCCESS); 428 } 429 430 if (lock_tlbie) 431 spin_unlock_irqrestore(&pSeries_lpar_tlbie_lock, flags); 432 } 433 434 static void pSeries_lpar_hugepage_invalidate(unsigned long vsid, 435 unsigned long addr, 436 unsigned char *hpte_slot_array, 437 int psize, int ssize) 438 { 439 int i, index = 0; 440 unsigned long s_addr = addr; 441 unsigned int max_hpte_count, valid; 442 unsigned long vpn_array[PPC64_HUGE_HPTE_BATCH]; 443 unsigned long slot_array[PPC64_HUGE_HPTE_BATCH]; 444 unsigned long shift, hidx, vpn = 0, hash, slot; 445 446 shift = mmu_psize_defs[psize].shift; 447 max_hpte_count = 1U << (PMD_SHIFT - shift); 448 449 for (i = 0; i < max_hpte_count; i++) { 450 valid = hpte_valid(hpte_slot_array, i); 451 if (!valid) 452 continue; 453 hidx = hpte_hash_index(hpte_slot_array, i); 454 455 /* get the vpn */ 456 addr = s_addr + (i * (1ul << shift)); 457 vpn = hpt_vpn(addr, vsid, ssize); 458 hash = hpt_hash(vpn, shift, ssize); 459 if (hidx & _PTEIDX_SECONDARY) 460 hash = ~hash; 461 462 slot = (hash & htab_hash_mask) * HPTES_PER_GROUP; 463 slot += hidx & _PTEIDX_GROUP_IX; 464 465 slot_array[index] = slot; 466 vpn_array[index] = vpn; 467 if (index == PPC64_HUGE_HPTE_BATCH - 1) { 468 /* 469 * Now do a bluk invalidate 470 */ 471 __pSeries_lpar_hugepage_invalidate(slot_array, 472 vpn_array, 473 PPC64_HUGE_HPTE_BATCH, 474 psize, ssize); 475 index = 0; 476 } else 477 index++; 478 } 479 if (index) 480 __pSeries_lpar_hugepage_invalidate(slot_array, vpn_array, 481 index, psize, ssize); 482 } 483 484 static void pSeries_lpar_hpte_removebolted(unsigned long ea, 485 int psize, int ssize) 486 { 487 unsigned long vpn; 488 unsigned long slot, vsid; 489 490 vsid = get_kernel_vsid(ea, ssize); 491 vpn = hpt_vpn(ea, vsid, ssize); 492 493 slot = pSeries_lpar_hpte_find(vpn, psize, ssize); 494 BUG_ON(slot == -1); 495 /* 496 * lpar doesn't use the passed actual page size 497 */ 498 pSeries_lpar_hpte_invalidate(slot, vpn, psize, 0, ssize, 0); 499 } 500 501 /* 502 * Take a spinlock around flushes to avoid bouncing the hypervisor tlbie 503 * lock. 504 */ 505 static void pSeries_lpar_flush_hash_range(unsigned long number, int local) 506 { 507 unsigned long vpn; 508 unsigned long i, pix, rc; 509 unsigned long flags = 0; 510 struct ppc64_tlb_batch *batch = &__get_cpu_var(ppc64_tlb_batch); 511 int lock_tlbie = !mmu_has_feature(MMU_FTR_LOCKLESS_TLBIE); 512 unsigned long param[9]; 513 unsigned long hash, index, shift, hidx, slot; 514 real_pte_t pte; 515 int psize, ssize; 516 517 if (lock_tlbie) 518 spin_lock_irqsave(&pSeries_lpar_tlbie_lock, flags); 519 520 psize = batch->psize; 521 ssize = batch->ssize; 522 pix = 0; 523 for (i = 0; i < number; i++) { 524 vpn = batch->vpn[i]; 525 pte = batch->pte[i]; 526 pte_iterate_hashed_subpages(pte, psize, vpn, index, shift) { 527 hash = hpt_hash(vpn, shift, ssize); 528 hidx = __rpte_to_hidx(pte, index); 529 if (hidx & _PTEIDX_SECONDARY) 530 hash = ~hash; 531 slot = (hash & htab_hash_mask) * HPTES_PER_GROUP; 532 slot += hidx & _PTEIDX_GROUP_IX; 533 if (!firmware_has_feature(FW_FEATURE_BULK_REMOVE)) { 534 /* 535 * lpar doesn't use the passed actual page size 536 */ 537 pSeries_lpar_hpte_invalidate(slot, vpn, psize, 538 0, ssize, local); 539 } else { 540 param[pix] = HBR_REQUEST | HBR_AVPN | slot; 541 param[pix+1] = hpte_encode_avpn(vpn, psize, 542 ssize); 543 pix += 2; 544 if (pix == 8) { 545 rc = plpar_hcall9(H_BULK_REMOVE, param, 546 param[0], param[1], param[2], 547 param[3], param[4], param[5], 548 param[6], param[7]); 549 BUG_ON(rc != H_SUCCESS); 550 pix = 0; 551 } 552 } 553 } pte_iterate_hashed_end(); 554 } 555 if (pix) { 556 param[pix] = HBR_END; 557 rc = plpar_hcall9(H_BULK_REMOVE, param, param[0], param[1], 558 param[2], param[3], param[4], param[5], 559 param[6], param[7]); 560 BUG_ON(rc != H_SUCCESS); 561 } 562 563 if (lock_tlbie) 564 spin_unlock_irqrestore(&pSeries_lpar_tlbie_lock, flags); 565 } 566 567 static int __init disable_bulk_remove(char *str) 568 { 569 if (strcmp(str, "off") == 0 && 570 firmware_has_feature(FW_FEATURE_BULK_REMOVE)) { 571 printk(KERN_INFO "Disabling BULK_REMOVE firmware feature"); 572 powerpc_firmware_features &= ~FW_FEATURE_BULK_REMOVE; 573 } 574 return 1; 575 } 576 577 __setup("bulk_remove=", disable_bulk_remove); 578 579 void __init hpte_init_lpar(void) 580 { 581 ppc_md.hpte_invalidate = pSeries_lpar_hpte_invalidate; 582 ppc_md.hpte_updatepp = pSeries_lpar_hpte_updatepp; 583 ppc_md.hpte_updateboltedpp = pSeries_lpar_hpte_updateboltedpp; 584 ppc_md.hpte_insert = pSeries_lpar_hpte_insert; 585 ppc_md.hpte_remove = pSeries_lpar_hpte_remove; 586 ppc_md.hpte_removebolted = pSeries_lpar_hpte_removebolted; 587 ppc_md.flush_hash_range = pSeries_lpar_flush_hash_range; 588 ppc_md.hpte_clear_all = pSeries_lpar_hptab_clear; 589 ppc_md.hugepage_invalidate = pSeries_lpar_hugepage_invalidate; 590 } 591 592 #ifdef CONFIG_PPC_SMLPAR 593 #define CMO_FREE_HINT_DEFAULT 1 594 static int cmo_free_hint_flag = CMO_FREE_HINT_DEFAULT; 595 596 static int __init cmo_free_hint(char *str) 597 { 598 char *parm; 599 parm = strstrip(str); 600 601 if (strcasecmp(parm, "no") == 0 || strcasecmp(parm, "off") == 0) { 602 printk(KERN_INFO "cmo_free_hint: CMO free page hinting is not active.\n"); 603 cmo_free_hint_flag = 0; 604 return 1; 605 } 606 607 cmo_free_hint_flag = 1; 608 printk(KERN_INFO "cmo_free_hint: CMO free page hinting is active.\n"); 609 610 if (strcasecmp(parm, "yes") == 0 || strcasecmp(parm, "on") == 0) 611 return 1; 612 613 return 0; 614 } 615 616 __setup("cmo_free_hint=", cmo_free_hint); 617 618 static void pSeries_set_page_state(struct page *page, int order, 619 unsigned long state) 620 { 621 int i, j; 622 unsigned long cmo_page_sz, addr; 623 624 cmo_page_sz = cmo_get_page_size(); 625 addr = __pa((unsigned long)page_address(page)); 626 627 for (i = 0; i < (1 << order); i++, addr += PAGE_SIZE) { 628 for (j = 0; j < PAGE_SIZE; j += cmo_page_sz) 629 plpar_hcall_norets(H_PAGE_INIT, state, addr + j, 0); 630 } 631 } 632 633 void arch_free_page(struct page *page, int order) 634 { 635 if (!cmo_free_hint_flag || !firmware_has_feature(FW_FEATURE_CMO)) 636 return; 637 638 pSeries_set_page_state(page, order, H_PAGE_SET_UNUSED); 639 } 640 EXPORT_SYMBOL(arch_free_page); 641 642 #endif 643 644 #ifdef CONFIG_TRACEPOINTS 645 #ifdef CONFIG_JUMP_LABEL 646 struct static_key hcall_tracepoint_key = STATIC_KEY_INIT; 647 648 void hcall_tracepoint_regfunc(void) 649 { 650 static_key_slow_inc(&hcall_tracepoint_key); 651 } 652 653 void hcall_tracepoint_unregfunc(void) 654 { 655 static_key_slow_dec(&hcall_tracepoint_key); 656 } 657 #else 658 /* 659 * We optimise our hcall path by placing hcall_tracepoint_refcount 660 * directly in the TOC so we can check if the hcall tracepoints are 661 * enabled via a single load. 662 */ 663 664 /* NB: reg/unreg are called while guarded with the tracepoints_mutex */ 665 extern long hcall_tracepoint_refcount; 666 667 void hcall_tracepoint_regfunc(void) 668 { 669 hcall_tracepoint_refcount++; 670 } 671 672 void hcall_tracepoint_unregfunc(void) 673 { 674 hcall_tracepoint_refcount--; 675 } 676 #endif 677 678 /* 679 * Since the tracing code might execute hcalls we need to guard against 680 * recursion. One example of this are spinlocks calling H_YIELD on 681 * shared processor partitions. 682 */ 683 static DEFINE_PER_CPU(unsigned int, hcall_trace_depth); 684 685 686 void __trace_hcall_entry(unsigned long opcode, unsigned long *args) 687 { 688 unsigned long flags; 689 unsigned int *depth; 690 691 /* 692 * We cannot call tracepoints inside RCU idle regions which 693 * means we must not trace H_CEDE. 694 */ 695 if (opcode == H_CEDE) 696 return; 697 698 local_irq_save(flags); 699 700 depth = &__get_cpu_var(hcall_trace_depth); 701 702 if (*depth) 703 goto out; 704 705 (*depth)++; 706 preempt_disable(); 707 trace_hcall_entry(opcode, args); 708 (*depth)--; 709 710 out: 711 local_irq_restore(flags); 712 } 713 714 void __trace_hcall_exit(long opcode, unsigned long retval, 715 unsigned long *retbuf) 716 { 717 unsigned long flags; 718 unsigned int *depth; 719 720 if (opcode == H_CEDE) 721 return; 722 723 local_irq_save(flags); 724 725 depth = &__get_cpu_var(hcall_trace_depth); 726 727 if (*depth) 728 goto out; 729 730 (*depth)++; 731 trace_hcall_exit(opcode, retval, retbuf); 732 preempt_enable(); 733 (*depth)--; 734 735 out: 736 local_irq_restore(flags); 737 } 738 #endif 739 740 /** 741 * h_get_mpp 742 * H_GET_MPP hcall returns info in 7 parms 743 */ 744 int h_get_mpp(struct hvcall_mpp_data *mpp_data) 745 { 746 int rc; 747 unsigned long retbuf[PLPAR_HCALL9_BUFSIZE]; 748 749 rc = plpar_hcall9(H_GET_MPP, retbuf); 750 751 mpp_data->entitled_mem = retbuf[0]; 752 mpp_data->mapped_mem = retbuf[1]; 753 754 mpp_data->group_num = (retbuf[2] >> 2 * 8) & 0xffff; 755 mpp_data->pool_num = retbuf[2] & 0xffff; 756 757 mpp_data->mem_weight = (retbuf[3] >> 7 * 8) & 0xff; 758 mpp_data->unallocated_mem_weight = (retbuf[3] >> 6 * 8) & 0xff; 759 mpp_data->unallocated_entitlement = retbuf[3] & 0xffffffffffffUL; 760 761 mpp_data->pool_size = retbuf[4]; 762 mpp_data->loan_request = retbuf[5]; 763 mpp_data->backing_mem = retbuf[6]; 764 765 return rc; 766 } 767 EXPORT_SYMBOL(h_get_mpp); 768 769 int h_get_mpp_x(struct hvcall_mpp_x_data *mpp_x_data) 770 { 771 int rc; 772 unsigned long retbuf[PLPAR_HCALL9_BUFSIZE] = { 0 }; 773 774 rc = plpar_hcall9(H_GET_MPP_X, retbuf); 775 776 mpp_x_data->coalesced_bytes = retbuf[0]; 777 mpp_x_data->pool_coalesced_bytes = retbuf[1]; 778 mpp_x_data->pool_purr_cycles = retbuf[2]; 779 mpp_x_data->pool_spurr_cycles = retbuf[3]; 780 781 return rc; 782 } 783