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 */ 57 EXPORT_SYMBOL(plpar_hcall); 58 EXPORT_SYMBOL(plpar_hcall9); 59 EXPORT_SYMBOL(plpar_hcall_norets); 60 61 extern void pSeries_find_serial_port(void); 62 63 void 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(&slb_shadow[cpu]); 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 } 124 125 static 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 &= ~_PAGE_COHERENT; 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 } 249 250 /* 251 * NOTE: for updatepp ops we are fortunate that the linux "newpp" bits and 252 * the low 3 bits of flags happen to line up. So no transform is needed. 253 * We can probably optimize here and assume the high bits of newpp are 254 * already zero. For now I am paranoid. 255 */ 256 static long pSeries_lpar_hpte_updatepp(unsigned long slot, 257 unsigned long newpp, 258 unsigned long vpn, 259 int psize, int apsize, 260 int ssize, int local) 261 { 262 unsigned long lpar_rc; 263 unsigned long flags = (newpp & 7) | H_AVPN; 264 unsigned long want_v; 265 266 want_v = hpte_encode_avpn(vpn, psize, ssize); 267 268 pr_devel(" update: avpnv=%016lx, hash=%016lx, f=%lx, psize: %d ...", 269 want_v, slot, flags, psize); 270 271 lpar_rc = plpar_pte_protect(flags, slot, want_v); 272 273 if (lpar_rc == H_NOT_FOUND) { 274 pr_devel("not found !\n"); 275 return -1; 276 } 277 278 pr_devel("ok\n"); 279 280 BUG_ON(lpar_rc != H_SUCCESS); 281 282 return 0; 283 } 284 285 static unsigned long pSeries_lpar_hpte_getword0(unsigned long slot) 286 { 287 unsigned long dword0; 288 unsigned long lpar_rc; 289 unsigned long dummy_word1; 290 unsigned long flags; 291 292 /* Read 1 pte at a time */ 293 /* Do not need RPN to logical page translation */ 294 /* No cross CEC PFT access */ 295 flags = 0; 296 297 lpar_rc = plpar_pte_read(flags, slot, &dword0, &dummy_word1); 298 299 BUG_ON(lpar_rc != H_SUCCESS); 300 301 return dword0; 302 } 303 304 static long pSeries_lpar_hpte_find(unsigned long vpn, int psize, int ssize) 305 { 306 unsigned long hash; 307 unsigned long i; 308 long slot; 309 unsigned long want_v, hpte_v; 310 311 hash = hpt_hash(vpn, mmu_psize_defs[psize].shift, ssize); 312 want_v = hpte_encode_avpn(vpn, psize, ssize); 313 314 /* Bolted entries are always in the primary group */ 315 slot = (hash & htab_hash_mask) * HPTES_PER_GROUP; 316 for (i = 0; i < HPTES_PER_GROUP; i++) { 317 hpte_v = pSeries_lpar_hpte_getword0(slot); 318 319 if (HPTE_V_COMPARE(hpte_v, want_v) && (hpte_v & HPTE_V_VALID)) 320 /* HPTE matches */ 321 return slot; 322 ++slot; 323 } 324 325 return -1; 326 } 327 328 static void pSeries_lpar_hpte_updateboltedpp(unsigned long newpp, 329 unsigned long ea, 330 int psize, int ssize) 331 { 332 unsigned long vpn; 333 unsigned long lpar_rc, slot, vsid, flags; 334 335 vsid = get_kernel_vsid(ea, ssize); 336 vpn = hpt_vpn(ea, vsid, ssize); 337 338 slot = pSeries_lpar_hpte_find(vpn, psize, ssize); 339 BUG_ON(slot == -1); 340 341 flags = newpp & 7; 342 lpar_rc = plpar_pte_protect(flags, slot, 0); 343 344 BUG_ON(lpar_rc != H_SUCCESS); 345 } 346 347 static void pSeries_lpar_hpte_invalidate(unsigned long slot, unsigned long vpn, 348 int psize, int apsize, 349 int ssize, int local) 350 { 351 unsigned long want_v; 352 unsigned long lpar_rc; 353 unsigned long dummy1, dummy2; 354 355 pr_devel(" inval : slot=%lx, vpn=%016lx, psize: %d, local: %d\n", 356 slot, vpn, psize, local); 357 358 want_v = hpte_encode_avpn(vpn, psize, ssize); 359 lpar_rc = plpar_pte_remove(H_AVPN, slot, want_v, &dummy1, &dummy2); 360 if (lpar_rc == H_NOT_FOUND) 361 return; 362 363 BUG_ON(lpar_rc != H_SUCCESS); 364 } 365 366 /* 367 * Limit iterations holding pSeries_lpar_tlbie_lock to 3. We also need 368 * to make sure that we avoid bouncing the hypervisor tlbie lock. 369 */ 370 #define PPC64_HUGE_HPTE_BATCH 12 371 372 static void __pSeries_lpar_hugepage_invalidate(unsigned long *slot, 373 unsigned long *vpn, int count, 374 int psize, int ssize) 375 { 376 unsigned long param[8]; 377 int i = 0, pix = 0, rc; 378 unsigned long flags = 0; 379 int lock_tlbie = !mmu_has_feature(MMU_FTR_LOCKLESS_TLBIE); 380 381 if (lock_tlbie) 382 spin_lock_irqsave(&pSeries_lpar_tlbie_lock, flags); 383 384 for (i = 0; i < count; i++) { 385 386 if (!firmware_has_feature(FW_FEATURE_BULK_REMOVE)) { 387 pSeries_lpar_hpte_invalidate(slot[i], vpn[i], psize, 0, 388 ssize, 0); 389 } else { 390 param[pix] = HBR_REQUEST | HBR_AVPN | slot[i]; 391 param[pix+1] = hpte_encode_avpn(vpn[i], psize, ssize); 392 pix += 2; 393 if (pix == 8) { 394 rc = plpar_hcall9(H_BULK_REMOVE, param, 395 param[0], param[1], param[2], 396 param[3], param[4], param[5], 397 param[6], param[7]); 398 BUG_ON(rc != H_SUCCESS); 399 pix = 0; 400 } 401 } 402 } 403 if (pix) { 404 param[pix] = HBR_END; 405 rc = plpar_hcall9(H_BULK_REMOVE, param, param[0], param[1], 406 param[2], param[3], param[4], param[5], 407 param[6], param[7]); 408 BUG_ON(rc != H_SUCCESS); 409 } 410 411 if (lock_tlbie) 412 spin_unlock_irqrestore(&pSeries_lpar_tlbie_lock, flags); 413 } 414 415 static void pSeries_lpar_hugepage_invalidate(struct mm_struct *mm, 416 unsigned char *hpte_slot_array, 417 unsigned long addr, int psize) 418 { 419 int ssize = 0, i, index = 0; 420 unsigned long s_addr = addr; 421 unsigned int max_hpte_count, valid; 422 unsigned long vpn_array[PPC64_HUGE_HPTE_BATCH]; 423 unsigned long slot_array[PPC64_HUGE_HPTE_BATCH]; 424 unsigned long shift, hidx, vpn = 0, vsid, hash, slot; 425 426 shift = mmu_psize_defs[psize].shift; 427 max_hpte_count = 1U << (PMD_SHIFT - shift); 428 429 for (i = 0; i < max_hpte_count; i++) { 430 valid = hpte_valid(hpte_slot_array, i); 431 if (!valid) 432 continue; 433 hidx = hpte_hash_index(hpte_slot_array, i); 434 435 /* get the vpn */ 436 addr = s_addr + (i * (1ul << shift)); 437 if (!is_kernel_addr(addr)) { 438 ssize = user_segment_size(addr); 439 vsid = get_vsid(mm->context.id, addr, ssize); 440 WARN_ON(vsid == 0); 441 } else { 442 vsid = get_kernel_vsid(addr, mmu_kernel_ssize); 443 ssize = mmu_kernel_ssize; 444 } 445 446 vpn = hpt_vpn(addr, vsid, ssize); 447 hash = hpt_hash(vpn, shift, ssize); 448 if (hidx & _PTEIDX_SECONDARY) 449 hash = ~hash; 450 451 slot = (hash & htab_hash_mask) * HPTES_PER_GROUP; 452 slot += hidx & _PTEIDX_GROUP_IX; 453 454 slot_array[index] = slot; 455 vpn_array[index] = vpn; 456 if (index == PPC64_HUGE_HPTE_BATCH - 1) { 457 /* 458 * Now do a bluk invalidate 459 */ 460 __pSeries_lpar_hugepage_invalidate(slot_array, 461 vpn_array, 462 PPC64_HUGE_HPTE_BATCH, 463 psize, ssize); 464 index = 0; 465 } else 466 index++; 467 } 468 if (index) 469 __pSeries_lpar_hugepage_invalidate(slot_array, vpn_array, 470 index, psize, ssize); 471 } 472 473 static void pSeries_lpar_hpte_removebolted(unsigned long ea, 474 int psize, int ssize) 475 { 476 unsigned long vpn; 477 unsigned long slot, vsid; 478 479 vsid = get_kernel_vsid(ea, ssize); 480 vpn = hpt_vpn(ea, vsid, ssize); 481 482 slot = pSeries_lpar_hpte_find(vpn, psize, ssize); 483 BUG_ON(slot == -1); 484 /* 485 * lpar doesn't use the passed actual page size 486 */ 487 pSeries_lpar_hpte_invalidate(slot, vpn, psize, 0, ssize, 0); 488 } 489 490 /* 491 * Take a spinlock around flushes to avoid bouncing the hypervisor tlbie 492 * lock. 493 */ 494 static void pSeries_lpar_flush_hash_range(unsigned long number, int local) 495 { 496 unsigned long vpn; 497 unsigned long i, pix, rc; 498 unsigned long flags = 0; 499 struct ppc64_tlb_batch *batch = &__get_cpu_var(ppc64_tlb_batch); 500 int lock_tlbie = !mmu_has_feature(MMU_FTR_LOCKLESS_TLBIE); 501 unsigned long param[9]; 502 unsigned long hash, index, shift, hidx, slot; 503 real_pte_t pte; 504 int psize, ssize; 505 506 if (lock_tlbie) 507 spin_lock_irqsave(&pSeries_lpar_tlbie_lock, flags); 508 509 psize = batch->psize; 510 ssize = batch->ssize; 511 pix = 0; 512 for (i = 0; i < number; i++) { 513 vpn = batch->vpn[i]; 514 pte = batch->pte[i]; 515 pte_iterate_hashed_subpages(pte, psize, vpn, index, shift) { 516 hash = hpt_hash(vpn, shift, ssize); 517 hidx = __rpte_to_hidx(pte, index); 518 if (hidx & _PTEIDX_SECONDARY) 519 hash = ~hash; 520 slot = (hash & htab_hash_mask) * HPTES_PER_GROUP; 521 slot += hidx & _PTEIDX_GROUP_IX; 522 if (!firmware_has_feature(FW_FEATURE_BULK_REMOVE)) { 523 /* 524 * lpar doesn't use the passed actual page size 525 */ 526 pSeries_lpar_hpte_invalidate(slot, vpn, psize, 527 0, ssize, local); 528 } else { 529 param[pix] = HBR_REQUEST | HBR_AVPN | slot; 530 param[pix+1] = hpte_encode_avpn(vpn, psize, 531 ssize); 532 pix += 2; 533 if (pix == 8) { 534 rc = plpar_hcall9(H_BULK_REMOVE, param, 535 param[0], param[1], param[2], 536 param[3], param[4], param[5], 537 param[6], param[7]); 538 BUG_ON(rc != H_SUCCESS); 539 pix = 0; 540 } 541 } 542 } pte_iterate_hashed_end(); 543 } 544 if (pix) { 545 param[pix] = HBR_END; 546 rc = plpar_hcall9(H_BULK_REMOVE, param, param[0], param[1], 547 param[2], param[3], param[4], param[5], 548 param[6], param[7]); 549 BUG_ON(rc != H_SUCCESS); 550 } 551 552 if (lock_tlbie) 553 spin_unlock_irqrestore(&pSeries_lpar_tlbie_lock, flags); 554 } 555 556 static int __init disable_bulk_remove(char *str) 557 { 558 if (strcmp(str, "off") == 0 && 559 firmware_has_feature(FW_FEATURE_BULK_REMOVE)) { 560 printk(KERN_INFO "Disabling BULK_REMOVE firmware feature"); 561 powerpc_firmware_features &= ~FW_FEATURE_BULK_REMOVE; 562 } 563 return 1; 564 } 565 566 __setup("bulk_remove=", disable_bulk_remove); 567 568 void __init hpte_init_lpar(void) 569 { 570 ppc_md.hpte_invalidate = pSeries_lpar_hpte_invalidate; 571 ppc_md.hpte_updatepp = pSeries_lpar_hpte_updatepp; 572 ppc_md.hpte_updateboltedpp = pSeries_lpar_hpte_updateboltedpp; 573 ppc_md.hpte_insert = pSeries_lpar_hpte_insert; 574 ppc_md.hpte_remove = pSeries_lpar_hpte_remove; 575 ppc_md.hpte_removebolted = pSeries_lpar_hpte_removebolted; 576 ppc_md.flush_hash_range = pSeries_lpar_flush_hash_range; 577 ppc_md.hpte_clear_all = pSeries_lpar_hptab_clear; 578 ppc_md.hugepage_invalidate = pSeries_lpar_hugepage_invalidate; 579 } 580 581 #ifdef CONFIG_PPC_SMLPAR 582 #define CMO_FREE_HINT_DEFAULT 1 583 static int cmo_free_hint_flag = CMO_FREE_HINT_DEFAULT; 584 585 static int __init cmo_free_hint(char *str) 586 { 587 char *parm; 588 parm = strstrip(str); 589 590 if (strcasecmp(parm, "no") == 0 || strcasecmp(parm, "off") == 0) { 591 printk(KERN_INFO "cmo_free_hint: CMO free page hinting is not active.\n"); 592 cmo_free_hint_flag = 0; 593 return 1; 594 } 595 596 cmo_free_hint_flag = 1; 597 printk(KERN_INFO "cmo_free_hint: CMO free page hinting is active.\n"); 598 599 if (strcasecmp(parm, "yes") == 0 || strcasecmp(parm, "on") == 0) 600 return 1; 601 602 return 0; 603 } 604 605 __setup("cmo_free_hint=", cmo_free_hint); 606 607 static void pSeries_set_page_state(struct page *page, int order, 608 unsigned long state) 609 { 610 int i, j; 611 unsigned long cmo_page_sz, addr; 612 613 cmo_page_sz = cmo_get_page_size(); 614 addr = __pa((unsigned long)page_address(page)); 615 616 for (i = 0; i < (1 << order); i++, addr += PAGE_SIZE) { 617 for (j = 0; j < PAGE_SIZE; j += cmo_page_sz) 618 plpar_hcall_norets(H_PAGE_INIT, state, addr + j, 0); 619 } 620 } 621 622 void arch_free_page(struct page *page, int order) 623 { 624 if (!cmo_free_hint_flag || !firmware_has_feature(FW_FEATURE_CMO)) 625 return; 626 627 pSeries_set_page_state(page, order, H_PAGE_SET_UNUSED); 628 } 629 EXPORT_SYMBOL(arch_free_page); 630 631 #endif 632 633 #ifdef CONFIG_TRACEPOINTS 634 /* 635 * We optimise our hcall path by placing hcall_tracepoint_refcount 636 * directly in the TOC so we can check if the hcall tracepoints are 637 * enabled via a single load. 638 */ 639 640 /* NB: reg/unreg are called while guarded with the tracepoints_mutex */ 641 extern long hcall_tracepoint_refcount; 642 643 /* 644 * Since the tracing code might execute hcalls we need to guard against 645 * recursion. One example of this are spinlocks calling H_YIELD on 646 * shared processor partitions. 647 */ 648 static DEFINE_PER_CPU(unsigned int, hcall_trace_depth); 649 650 void hcall_tracepoint_regfunc(void) 651 { 652 hcall_tracepoint_refcount++; 653 } 654 655 void hcall_tracepoint_unregfunc(void) 656 { 657 hcall_tracepoint_refcount--; 658 } 659 660 void __trace_hcall_entry(unsigned long opcode, unsigned long *args) 661 { 662 unsigned long flags; 663 unsigned int *depth; 664 665 /* 666 * We cannot call tracepoints inside RCU idle regions which 667 * means we must not trace H_CEDE. 668 */ 669 if (opcode == H_CEDE) 670 return; 671 672 local_irq_save(flags); 673 674 depth = &__get_cpu_var(hcall_trace_depth); 675 676 if (*depth) 677 goto out; 678 679 (*depth)++; 680 preempt_disable(); 681 trace_hcall_entry(opcode, args); 682 (*depth)--; 683 684 out: 685 local_irq_restore(flags); 686 } 687 688 void __trace_hcall_exit(long opcode, unsigned long retval, 689 unsigned long *retbuf) 690 { 691 unsigned long flags; 692 unsigned int *depth; 693 694 if (opcode == H_CEDE) 695 return; 696 697 local_irq_save(flags); 698 699 depth = &__get_cpu_var(hcall_trace_depth); 700 701 if (*depth) 702 goto out; 703 704 (*depth)++; 705 trace_hcall_exit(opcode, retval, retbuf); 706 preempt_enable(); 707 (*depth)--; 708 709 out: 710 local_irq_restore(flags); 711 } 712 #endif 713 714 /** 715 * h_get_mpp 716 * H_GET_MPP hcall returns info in 7 parms 717 */ 718 int h_get_mpp(struct hvcall_mpp_data *mpp_data) 719 { 720 int rc; 721 unsigned long retbuf[PLPAR_HCALL9_BUFSIZE]; 722 723 rc = plpar_hcall9(H_GET_MPP, retbuf); 724 725 mpp_data->entitled_mem = retbuf[0]; 726 mpp_data->mapped_mem = retbuf[1]; 727 728 mpp_data->group_num = (retbuf[2] >> 2 * 8) & 0xffff; 729 mpp_data->pool_num = retbuf[2] & 0xffff; 730 731 mpp_data->mem_weight = (retbuf[3] >> 7 * 8) & 0xff; 732 mpp_data->unallocated_mem_weight = (retbuf[3] >> 6 * 8) & 0xff; 733 mpp_data->unallocated_entitlement = retbuf[3] & 0xffffffffffffUL; 734 735 mpp_data->pool_size = retbuf[4]; 736 mpp_data->loan_request = retbuf[5]; 737 mpp_data->backing_mem = retbuf[6]; 738 739 return rc; 740 } 741 EXPORT_SYMBOL(h_get_mpp); 742 743 int h_get_mpp_x(struct hvcall_mpp_x_data *mpp_x_data) 744 { 745 int rc; 746 unsigned long retbuf[PLPAR_HCALL9_BUFSIZE] = { 0 }; 747 748 rc = plpar_hcall9(H_GET_MPP_X, retbuf); 749 750 mpp_x_data->coalesced_bytes = retbuf[0]; 751 mpp_x_data->pool_coalesced_bytes = retbuf[1]; 752 mpp_x_data->pool_purr_cycles = retbuf[2]; 753 mpp_x_data->pool_spurr_cycles = retbuf[3]; 754 755 return rc; 756 } 757