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/jump_label.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 #include <asm/asm-prototypes.h> 49 50 #include "pseries.h" 51 52 /* Flag bits for H_BULK_REMOVE */ 53 #define HBR_REQUEST 0x4000000000000000UL 54 #define HBR_RESPONSE 0x8000000000000000UL 55 #define HBR_END 0xc000000000000000UL 56 #define HBR_AVPN 0x0200000000000000UL 57 #define HBR_ANDCOND 0x0100000000000000UL 58 59 60 /* in hvCall.S */ 61 EXPORT_SYMBOL(plpar_hcall); 62 EXPORT_SYMBOL(plpar_hcall9); 63 EXPORT_SYMBOL(plpar_hcall_norets); 64 65 void vpa_init(int cpu) 66 { 67 int hwcpu = get_hard_smp_processor_id(cpu); 68 unsigned long addr; 69 long ret; 70 struct paca_struct *pp; 71 struct dtl_entry *dtl; 72 73 /* 74 * The spec says it "may be problematic" if CPU x registers the VPA of 75 * CPU y. We should never do that, but wail if we ever do. 76 */ 77 WARN_ON(cpu != smp_processor_id()); 78 79 if (cpu_has_feature(CPU_FTR_ALTIVEC)) 80 lppaca_of(cpu).vmxregs_in_use = 1; 81 82 if (cpu_has_feature(CPU_FTR_ARCH_207S)) 83 lppaca_of(cpu).ebb_regs_in_use = 1; 84 85 addr = __pa(&lppaca_of(cpu)); 86 ret = register_vpa(hwcpu, addr); 87 88 if (ret) { 89 pr_err("WARNING: VPA registration for cpu %d (hw %d) of area " 90 "%lx failed with %ld\n", cpu, hwcpu, addr, ret); 91 return; 92 } 93 94 #ifdef CONFIG_PPC_STD_MMU_64 95 /* 96 * PAPR says this feature is SLB-Buffer but firmware never 97 * reports that. All SPLPAR support SLB shadow buffer. 98 */ 99 if (!radix_enabled() && firmware_has_feature(FW_FEATURE_SPLPAR)) { 100 addr = __pa(paca[cpu].slb_shadow_ptr); 101 ret = register_slb_shadow(hwcpu, addr); 102 if (ret) 103 pr_err("WARNING: SLB shadow buffer registration for " 104 "cpu %d (hw %d) of area %lx failed with %ld\n", 105 cpu, hwcpu, addr, ret); 106 } 107 #endif /* CONFIG_PPC_STD_MMU_64 */ 108 109 /* 110 * Register dispatch trace log, if one has been allocated. 111 */ 112 pp = &paca[cpu]; 113 dtl = pp->dispatch_log; 114 if (dtl) { 115 pp->dtl_ridx = 0; 116 pp->dtl_curr = dtl; 117 lppaca_of(cpu).dtl_idx = 0; 118 119 /* hypervisor reads buffer length from this field */ 120 dtl->enqueue_to_dispatch_time = cpu_to_be32(DISPATCH_LOG_BYTES); 121 ret = register_dtl(hwcpu, __pa(dtl)); 122 if (ret) 123 pr_err("WARNING: DTL registration of cpu %d (hw %d) " 124 "failed with %ld\n", smp_processor_id(), 125 hwcpu, ret); 126 lppaca_of(cpu).dtl_enable_mask = 2; 127 } 128 } 129 130 #ifdef CONFIG_PPC_STD_MMU_64 131 132 static long pSeries_lpar_hpte_insert(unsigned long hpte_group, 133 unsigned long vpn, unsigned long pa, 134 unsigned long rflags, unsigned long vflags, 135 int psize, int apsize, int ssize) 136 { 137 unsigned long lpar_rc; 138 unsigned long flags; 139 unsigned long slot; 140 unsigned long hpte_v, hpte_r; 141 142 if (!(vflags & HPTE_V_BOLTED)) 143 pr_devel("hpte_insert(group=%lx, vpn=%016lx, " 144 "pa=%016lx, rflags=%lx, vflags=%lx, psize=%d)\n", 145 hpte_group, vpn, pa, rflags, vflags, psize); 146 147 hpte_v = hpte_encode_v(vpn, psize, apsize, ssize) | vflags | HPTE_V_VALID; 148 hpte_r = hpte_encode_r(pa, psize, apsize, ssize) | rflags; 149 150 if (!(vflags & HPTE_V_BOLTED)) 151 pr_devel(" hpte_v=%016lx, hpte_r=%016lx\n", hpte_v, hpte_r); 152 153 /* Now fill in the actual HPTE */ 154 /* Set CEC cookie to 0 */ 155 /* Zero page = 0 */ 156 /* I-cache Invalidate = 0 */ 157 /* I-cache synchronize = 0 */ 158 /* Exact = 0 */ 159 flags = 0; 160 161 if (firmware_has_feature(FW_FEATURE_XCMO) && !(hpte_r & HPTE_R_N)) 162 flags |= H_COALESCE_CAND; 163 164 lpar_rc = plpar_pte_enter(flags, hpte_group, hpte_v, hpte_r, &slot); 165 if (unlikely(lpar_rc == H_PTEG_FULL)) { 166 if (!(vflags & HPTE_V_BOLTED)) 167 pr_devel(" full\n"); 168 return -1; 169 } 170 171 /* 172 * Since we try and ioremap PHBs we don't own, the pte insert 173 * will fail. However we must catch the failure in hash_page 174 * or we will loop forever, so return -2 in this case. 175 */ 176 if (unlikely(lpar_rc != H_SUCCESS)) { 177 if (!(vflags & HPTE_V_BOLTED)) 178 pr_devel(" lpar err %ld\n", lpar_rc); 179 return -2; 180 } 181 if (!(vflags & HPTE_V_BOLTED)) 182 pr_devel(" -> slot: %lu\n", slot & 7); 183 184 /* Because of iSeries, we have to pass down the secondary 185 * bucket bit here as well 186 */ 187 return (slot & 7) | (!!(vflags & HPTE_V_SECONDARY) << 3); 188 } 189 190 static DEFINE_SPINLOCK(pSeries_lpar_tlbie_lock); 191 192 static long pSeries_lpar_hpte_remove(unsigned long hpte_group) 193 { 194 unsigned long slot_offset; 195 unsigned long lpar_rc; 196 int i; 197 unsigned long dummy1, dummy2; 198 199 /* pick a random slot to start at */ 200 slot_offset = mftb() & 0x7; 201 202 for (i = 0; i < HPTES_PER_GROUP; i++) { 203 204 /* don't remove a bolted entry */ 205 lpar_rc = plpar_pte_remove(H_ANDCOND, hpte_group + slot_offset, 206 (0x1UL << 4), &dummy1, &dummy2); 207 if (lpar_rc == H_SUCCESS) 208 return i; 209 210 /* 211 * The test for adjunct partition is performed before the 212 * ANDCOND test. H_RESOURCE may be returned, so we need to 213 * check for that as well. 214 */ 215 BUG_ON(lpar_rc != H_NOT_FOUND && lpar_rc != H_RESOURCE); 216 217 slot_offset++; 218 slot_offset &= 0x7; 219 } 220 221 return -1; 222 } 223 224 static void pSeries_lpar_hptab_clear(void) 225 { 226 unsigned long size_bytes = 1UL << ppc64_pft_size; 227 unsigned long hpte_count = size_bytes >> 4; 228 struct { 229 unsigned long pteh; 230 unsigned long ptel; 231 } ptes[4]; 232 long lpar_rc; 233 unsigned long i, j; 234 235 /* Read in batches of 4, 236 * invalidate only valid entries not in the VRMA 237 * hpte_count will be a multiple of 4 238 */ 239 for (i = 0; i < hpte_count; i += 4) { 240 lpar_rc = plpar_pte_read_4_raw(0, i, (void *)ptes); 241 if (lpar_rc != H_SUCCESS) 242 continue; 243 for (j = 0; j < 4; j++){ 244 if ((ptes[j].pteh & HPTE_V_VRMA_MASK) == 245 HPTE_V_VRMA_MASK) 246 continue; 247 if (ptes[j].pteh & HPTE_V_VALID) 248 plpar_pte_remove_raw(0, i + j, 0, 249 &(ptes[j].pteh), &(ptes[j].ptel)); 250 } 251 } 252 253 #ifdef __LITTLE_ENDIAN__ 254 /* 255 * Reset exceptions to big endian. 256 * 257 * FIXME this is a hack for kexec, we need to reset the exception 258 * endian before starting the new kernel and this is a convenient place 259 * to do it. 260 * 261 * This is also called on boot when a fadump happens. In that case we 262 * must not change the exception endian mode. 263 */ 264 if (firmware_has_feature(FW_FEATURE_SET_MODE) && !is_fadump_active()) { 265 long rc; 266 267 rc = pseries_big_endian_exceptions(); 268 /* 269 * At this point it is unlikely panic() will get anything 270 * out to the user, but at least this will stop us from 271 * continuing on further and creating an even more 272 * difficult to debug situation. 273 * 274 * There is a known problem when kdump'ing, if cpus are offline 275 * the above call will fail. Rather than panicking again, keep 276 * going and hope the kdump kernel is also little endian, which 277 * it usually is. 278 */ 279 if (rc && !kdump_in_progress()) 280 panic("Could not enable big endian exceptions"); 281 } 282 #endif 283 } 284 285 /* 286 * NOTE: for updatepp ops we are fortunate that the linux "newpp" bits and 287 * the low 3 bits of flags happen to line up. So no transform is needed. 288 * We can probably optimize here and assume the high bits of newpp are 289 * already zero. For now I am paranoid. 290 */ 291 static long pSeries_lpar_hpte_updatepp(unsigned long slot, 292 unsigned long newpp, 293 unsigned long vpn, 294 int psize, int apsize, 295 int ssize, unsigned long inv_flags) 296 { 297 unsigned long lpar_rc; 298 unsigned long flags = (newpp & 7) | H_AVPN; 299 unsigned long want_v; 300 301 want_v = hpte_encode_avpn(vpn, psize, ssize); 302 303 pr_devel(" update: avpnv=%016lx, hash=%016lx, f=%lx, psize: %d ...", 304 want_v, slot, flags, psize); 305 306 lpar_rc = plpar_pte_protect(flags, slot, want_v); 307 308 if (lpar_rc == H_NOT_FOUND) { 309 pr_devel("not found !\n"); 310 return -1; 311 } 312 313 pr_devel("ok\n"); 314 315 BUG_ON(lpar_rc != H_SUCCESS); 316 317 return 0; 318 } 319 320 static long __pSeries_lpar_hpte_find(unsigned long want_v, unsigned long hpte_group) 321 { 322 long lpar_rc; 323 unsigned long i, j; 324 struct { 325 unsigned long pteh; 326 unsigned long ptel; 327 } ptes[4]; 328 329 for (i = 0; i < HPTES_PER_GROUP; i += 4, hpte_group += 4) { 330 331 lpar_rc = plpar_pte_read_4(0, hpte_group, (void *)ptes); 332 if (lpar_rc != H_SUCCESS) 333 continue; 334 335 for (j = 0; j < 4; j++) { 336 if (HPTE_V_COMPARE(ptes[j].pteh, want_v) && 337 (ptes[j].pteh & HPTE_V_VALID)) 338 return i + j; 339 } 340 } 341 342 return -1; 343 } 344 345 static long pSeries_lpar_hpte_find(unsigned long vpn, int psize, int ssize) 346 { 347 long slot; 348 unsigned long hash; 349 unsigned long want_v; 350 unsigned long hpte_group; 351 352 hash = hpt_hash(vpn, mmu_psize_defs[psize].shift, ssize); 353 want_v = hpte_encode_avpn(vpn, psize, ssize); 354 355 /* Bolted entries are always in the primary group */ 356 hpte_group = (hash & htab_hash_mask) * HPTES_PER_GROUP; 357 slot = __pSeries_lpar_hpte_find(want_v, hpte_group); 358 if (slot < 0) 359 return -1; 360 return hpte_group + slot; 361 } 362 363 static void pSeries_lpar_hpte_updateboltedpp(unsigned long newpp, 364 unsigned long ea, 365 int psize, int ssize) 366 { 367 unsigned long vpn; 368 unsigned long lpar_rc, slot, vsid, flags; 369 370 vsid = get_kernel_vsid(ea, ssize); 371 vpn = hpt_vpn(ea, vsid, ssize); 372 373 slot = pSeries_lpar_hpte_find(vpn, psize, ssize); 374 BUG_ON(slot == -1); 375 376 flags = newpp & 7; 377 lpar_rc = plpar_pte_protect(flags, slot, 0); 378 379 BUG_ON(lpar_rc != H_SUCCESS); 380 } 381 382 static void pSeries_lpar_hpte_invalidate(unsigned long slot, unsigned long vpn, 383 int psize, int apsize, 384 int ssize, int local) 385 { 386 unsigned long want_v; 387 unsigned long lpar_rc; 388 unsigned long dummy1, dummy2; 389 390 pr_devel(" inval : slot=%lx, vpn=%016lx, psize: %d, local: %d\n", 391 slot, vpn, psize, local); 392 393 want_v = hpte_encode_avpn(vpn, psize, ssize); 394 lpar_rc = plpar_pte_remove(H_AVPN, slot, want_v, &dummy1, &dummy2); 395 if (lpar_rc == H_NOT_FOUND) 396 return; 397 398 BUG_ON(lpar_rc != H_SUCCESS); 399 } 400 401 #ifdef CONFIG_TRANSPARENT_HUGEPAGE 402 /* 403 * Limit iterations holding pSeries_lpar_tlbie_lock to 3. We also need 404 * to make sure that we avoid bouncing the hypervisor tlbie lock. 405 */ 406 #define PPC64_HUGE_HPTE_BATCH 12 407 408 static void __pSeries_lpar_hugepage_invalidate(unsigned long *slot, 409 unsigned long *vpn, int count, 410 int psize, int ssize) 411 { 412 unsigned long param[8]; 413 int i = 0, pix = 0, rc; 414 unsigned long flags = 0; 415 int lock_tlbie = !mmu_has_feature(MMU_FTR_LOCKLESS_TLBIE); 416 417 if (lock_tlbie) 418 spin_lock_irqsave(&pSeries_lpar_tlbie_lock, flags); 419 420 for (i = 0; i < count; i++) { 421 422 if (!firmware_has_feature(FW_FEATURE_BULK_REMOVE)) { 423 pSeries_lpar_hpte_invalidate(slot[i], vpn[i], psize, 0, 424 ssize, 0); 425 } else { 426 param[pix] = HBR_REQUEST | HBR_AVPN | slot[i]; 427 param[pix+1] = hpte_encode_avpn(vpn[i], psize, ssize); 428 pix += 2; 429 if (pix == 8) { 430 rc = plpar_hcall9(H_BULK_REMOVE, param, 431 param[0], param[1], param[2], 432 param[3], param[4], param[5], 433 param[6], param[7]); 434 BUG_ON(rc != H_SUCCESS); 435 pix = 0; 436 } 437 } 438 } 439 if (pix) { 440 param[pix] = HBR_END; 441 rc = plpar_hcall9(H_BULK_REMOVE, param, param[0], param[1], 442 param[2], param[3], param[4], param[5], 443 param[6], param[7]); 444 BUG_ON(rc != H_SUCCESS); 445 } 446 447 if (lock_tlbie) 448 spin_unlock_irqrestore(&pSeries_lpar_tlbie_lock, flags); 449 } 450 451 static void pSeries_lpar_hugepage_invalidate(unsigned long vsid, 452 unsigned long addr, 453 unsigned char *hpte_slot_array, 454 int psize, int ssize, int local) 455 { 456 int i, index = 0; 457 unsigned long s_addr = addr; 458 unsigned int max_hpte_count, valid; 459 unsigned long vpn_array[PPC64_HUGE_HPTE_BATCH]; 460 unsigned long slot_array[PPC64_HUGE_HPTE_BATCH]; 461 unsigned long shift, hidx, vpn = 0, hash, slot; 462 463 shift = mmu_psize_defs[psize].shift; 464 max_hpte_count = 1U << (PMD_SHIFT - shift); 465 466 for (i = 0; i < max_hpte_count; i++) { 467 valid = hpte_valid(hpte_slot_array, i); 468 if (!valid) 469 continue; 470 hidx = hpte_hash_index(hpte_slot_array, i); 471 472 /* get the vpn */ 473 addr = s_addr + (i * (1ul << shift)); 474 vpn = hpt_vpn(addr, vsid, ssize); 475 hash = hpt_hash(vpn, shift, ssize); 476 if (hidx & _PTEIDX_SECONDARY) 477 hash = ~hash; 478 479 slot = (hash & htab_hash_mask) * HPTES_PER_GROUP; 480 slot += hidx & _PTEIDX_GROUP_IX; 481 482 slot_array[index] = slot; 483 vpn_array[index] = vpn; 484 if (index == PPC64_HUGE_HPTE_BATCH - 1) { 485 /* 486 * Now do a bluk invalidate 487 */ 488 __pSeries_lpar_hugepage_invalidate(slot_array, 489 vpn_array, 490 PPC64_HUGE_HPTE_BATCH, 491 psize, ssize); 492 index = 0; 493 } else 494 index++; 495 } 496 if (index) 497 __pSeries_lpar_hugepage_invalidate(slot_array, vpn_array, 498 index, psize, ssize); 499 } 500 #else 501 static void pSeries_lpar_hugepage_invalidate(unsigned long vsid, 502 unsigned long addr, 503 unsigned char *hpte_slot_array, 504 int psize, int ssize, int local) 505 { 506 WARN(1, "%s called without THP support\n", __func__); 507 } 508 #endif 509 510 static int pSeries_lpar_hpte_removebolted(unsigned long ea, 511 int psize, int ssize) 512 { 513 unsigned long vpn; 514 unsigned long slot, vsid; 515 516 vsid = get_kernel_vsid(ea, ssize); 517 vpn = hpt_vpn(ea, vsid, ssize); 518 519 slot = pSeries_lpar_hpte_find(vpn, psize, ssize); 520 if (slot == -1) 521 return -ENOENT; 522 523 /* 524 * lpar doesn't use the passed actual page size 525 */ 526 pSeries_lpar_hpte_invalidate(slot, vpn, psize, 0, ssize, 0); 527 return 0; 528 } 529 530 /* 531 * Take a spinlock around flushes to avoid bouncing the hypervisor tlbie 532 * lock. 533 */ 534 static void pSeries_lpar_flush_hash_range(unsigned long number, int local) 535 { 536 unsigned long vpn; 537 unsigned long i, pix, rc; 538 unsigned long flags = 0; 539 struct ppc64_tlb_batch *batch = this_cpu_ptr(&ppc64_tlb_batch); 540 int lock_tlbie = !mmu_has_feature(MMU_FTR_LOCKLESS_TLBIE); 541 unsigned long param[9]; 542 unsigned long hash, index, shift, hidx, slot; 543 real_pte_t pte; 544 int psize, ssize; 545 546 if (lock_tlbie) 547 spin_lock_irqsave(&pSeries_lpar_tlbie_lock, flags); 548 549 psize = batch->psize; 550 ssize = batch->ssize; 551 pix = 0; 552 for (i = 0; i < number; i++) { 553 vpn = batch->vpn[i]; 554 pte = batch->pte[i]; 555 pte_iterate_hashed_subpages(pte, psize, vpn, index, shift) { 556 hash = hpt_hash(vpn, shift, ssize); 557 hidx = __rpte_to_hidx(pte, index); 558 if (hidx & _PTEIDX_SECONDARY) 559 hash = ~hash; 560 slot = (hash & htab_hash_mask) * HPTES_PER_GROUP; 561 slot += hidx & _PTEIDX_GROUP_IX; 562 if (!firmware_has_feature(FW_FEATURE_BULK_REMOVE)) { 563 /* 564 * lpar doesn't use the passed actual page size 565 */ 566 pSeries_lpar_hpte_invalidate(slot, vpn, psize, 567 0, ssize, local); 568 } else { 569 param[pix] = HBR_REQUEST | HBR_AVPN | slot; 570 param[pix+1] = hpte_encode_avpn(vpn, psize, 571 ssize); 572 pix += 2; 573 if (pix == 8) { 574 rc = plpar_hcall9(H_BULK_REMOVE, param, 575 param[0], param[1], param[2], 576 param[3], param[4], param[5], 577 param[6], param[7]); 578 BUG_ON(rc != H_SUCCESS); 579 pix = 0; 580 } 581 } 582 } pte_iterate_hashed_end(); 583 } 584 if (pix) { 585 param[pix] = HBR_END; 586 rc = plpar_hcall9(H_BULK_REMOVE, param, param[0], param[1], 587 param[2], param[3], param[4], param[5], 588 param[6], param[7]); 589 BUG_ON(rc != H_SUCCESS); 590 } 591 592 if (lock_tlbie) 593 spin_unlock_irqrestore(&pSeries_lpar_tlbie_lock, flags); 594 } 595 596 static int __init disable_bulk_remove(char *str) 597 { 598 if (strcmp(str, "off") == 0 && 599 firmware_has_feature(FW_FEATURE_BULK_REMOVE)) { 600 printk(KERN_INFO "Disabling BULK_REMOVE firmware feature"); 601 powerpc_firmware_features &= ~FW_FEATURE_BULK_REMOVE; 602 } 603 return 1; 604 } 605 606 __setup("bulk_remove=", disable_bulk_remove); 607 608 void __init hpte_init_lpar(void) 609 { 610 ppc_md.hpte_invalidate = pSeries_lpar_hpte_invalidate; 611 ppc_md.hpte_updatepp = pSeries_lpar_hpte_updatepp; 612 ppc_md.hpte_updateboltedpp = pSeries_lpar_hpte_updateboltedpp; 613 ppc_md.hpte_insert = pSeries_lpar_hpte_insert; 614 ppc_md.hpte_remove = pSeries_lpar_hpte_remove; 615 ppc_md.hpte_removebolted = pSeries_lpar_hpte_removebolted; 616 ppc_md.flush_hash_range = pSeries_lpar_flush_hash_range; 617 ppc_md.hpte_clear_all = pSeries_lpar_hptab_clear; 618 ppc_md.hugepage_invalidate = pSeries_lpar_hugepage_invalidate; 619 } 620 621 #ifdef CONFIG_PPC_SMLPAR 622 #define CMO_FREE_HINT_DEFAULT 1 623 static int cmo_free_hint_flag = CMO_FREE_HINT_DEFAULT; 624 625 static int __init cmo_free_hint(char *str) 626 { 627 char *parm; 628 parm = strstrip(str); 629 630 if (strcasecmp(parm, "no") == 0 || strcasecmp(parm, "off") == 0) { 631 printk(KERN_INFO "cmo_free_hint: CMO free page hinting is not active.\n"); 632 cmo_free_hint_flag = 0; 633 return 1; 634 } 635 636 cmo_free_hint_flag = 1; 637 printk(KERN_INFO "cmo_free_hint: CMO free page hinting is active.\n"); 638 639 if (strcasecmp(parm, "yes") == 0 || strcasecmp(parm, "on") == 0) 640 return 1; 641 642 return 0; 643 } 644 645 __setup("cmo_free_hint=", cmo_free_hint); 646 647 static void pSeries_set_page_state(struct page *page, int order, 648 unsigned long state) 649 { 650 int i, j; 651 unsigned long cmo_page_sz, addr; 652 653 cmo_page_sz = cmo_get_page_size(); 654 addr = __pa((unsigned long)page_address(page)); 655 656 for (i = 0; i < (1 << order); i++, addr += PAGE_SIZE) { 657 for (j = 0; j < PAGE_SIZE; j += cmo_page_sz) 658 plpar_hcall_norets(H_PAGE_INIT, state, addr + j, 0); 659 } 660 } 661 662 void arch_free_page(struct page *page, int order) 663 { 664 if (radix_enabled()) 665 return; 666 if (!cmo_free_hint_flag || !firmware_has_feature(FW_FEATURE_CMO)) 667 return; 668 669 pSeries_set_page_state(page, order, H_PAGE_SET_UNUSED); 670 } 671 EXPORT_SYMBOL(arch_free_page); 672 673 #endif /* CONFIG_PPC_SMLPAR */ 674 #endif /* CONFIG_PPC_STD_MMU_64 */ 675 676 #ifdef CONFIG_TRACEPOINTS 677 #ifdef HAVE_JUMP_LABEL 678 struct static_key hcall_tracepoint_key = STATIC_KEY_INIT; 679 680 void hcall_tracepoint_regfunc(void) 681 { 682 static_key_slow_inc(&hcall_tracepoint_key); 683 } 684 685 void hcall_tracepoint_unregfunc(void) 686 { 687 static_key_slow_dec(&hcall_tracepoint_key); 688 } 689 #else 690 /* 691 * We optimise our hcall path by placing hcall_tracepoint_refcount 692 * directly in the TOC so we can check if the hcall tracepoints are 693 * enabled via a single load. 694 */ 695 696 /* NB: reg/unreg are called while guarded with the tracepoints_mutex */ 697 extern long hcall_tracepoint_refcount; 698 699 void hcall_tracepoint_regfunc(void) 700 { 701 hcall_tracepoint_refcount++; 702 } 703 704 void hcall_tracepoint_unregfunc(void) 705 { 706 hcall_tracepoint_refcount--; 707 } 708 #endif 709 710 /* 711 * Since the tracing code might execute hcalls we need to guard against 712 * recursion. One example of this are spinlocks calling H_YIELD on 713 * shared processor partitions. 714 */ 715 static DEFINE_PER_CPU(unsigned int, hcall_trace_depth); 716 717 718 void __trace_hcall_entry(unsigned long opcode, unsigned long *args) 719 { 720 unsigned long flags; 721 unsigned int *depth; 722 723 /* 724 * We cannot call tracepoints inside RCU idle regions which 725 * means we must not trace H_CEDE. 726 */ 727 if (opcode == H_CEDE) 728 return; 729 730 local_irq_save(flags); 731 732 depth = this_cpu_ptr(&hcall_trace_depth); 733 734 if (*depth) 735 goto out; 736 737 (*depth)++; 738 preempt_disable(); 739 trace_hcall_entry(opcode, args); 740 (*depth)--; 741 742 out: 743 local_irq_restore(flags); 744 } 745 746 void __trace_hcall_exit(long opcode, unsigned long retval, 747 unsigned long *retbuf) 748 { 749 unsigned long flags; 750 unsigned int *depth; 751 752 if (opcode == H_CEDE) 753 return; 754 755 local_irq_save(flags); 756 757 depth = this_cpu_ptr(&hcall_trace_depth); 758 759 if (*depth) 760 goto out; 761 762 (*depth)++; 763 trace_hcall_exit(opcode, retval, retbuf); 764 preempt_enable(); 765 (*depth)--; 766 767 out: 768 local_irq_restore(flags); 769 } 770 #endif 771 772 /** 773 * h_get_mpp 774 * H_GET_MPP hcall returns info in 7 parms 775 */ 776 int h_get_mpp(struct hvcall_mpp_data *mpp_data) 777 { 778 int rc; 779 unsigned long retbuf[PLPAR_HCALL9_BUFSIZE]; 780 781 rc = plpar_hcall9(H_GET_MPP, retbuf); 782 783 mpp_data->entitled_mem = retbuf[0]; 784 mpp_data->mapped_mem = retbuf[1]; 785 786 mpp_data->group_num = (retbuf[2] >> 2 * 8) & 0xffff; 787 mpp_data->pool_num = retbuf[2] & 0xffff; 788 789 mpp_data->mem_weight = (retbuf[3] >> 7 * 8) & 0xff; 790 mpp_data->unallocated_mem_weight = (retbuf[3] >> 6 * 8) & 0xff; 791 mpp_data->unallocated_entitlement = retbuf[3] & 0xffffffffffffUL; 792 793 mpp_data->pool_size = retbuf[4]; 794 mpp_data->loan_request = retbuf[5]; 795 mpp_data->backing_mem = retbuf[6]; 796 797 return rc; 798 } 799 EXPORT_SYMBOL(h_get_mpp); 800 801 int h_get_mpp_x(struct hvcall_mpp_x_data *mpp_x_data) 802 { 803 int rc; 804 unsigned long retbuf[PLPAR_HCALL9_BUFSIZE] = { 0 }; 805 806 rc = plpar_hcall9(H_GET_MPP_X, retbuf); 807 808 mpp_x_data->coalesced_bytes = retbuf[0]; 809 mpp_x_data->pool_coalesced_bytes = retbuf[1]; 810 mpp_x_data->pool_purr_cycles = retbuf[2]; 811 mpp_x_data->pool_spurr_cycles = retbuf[3]; 812 813 return rc; 814 } 815