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