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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 | /* SPDX-License-Identifier: GPL-2.0-or-later */ #ifndef _ASM_POWERPC_BOOK3S_64_MMU_HASH_H_ #define _ASM_POWERPC_BOOK3S_64_MMU_HASH_H_ /* * PowerPC64 memory management structures * * Dave Engebretsen & Mike Corrigan <{engebret|mikejc}@us.ibm.com> * PPC64 rework. */ #include <asm/page.h> #include <asm/bug.h> #include <asm/asm-const.h> /* * This is necessary to get the definition of PGTABLE_RANGE which we * need for various slices related matters. Note that this isn't the * complete pgtable.h but only a portion of it. */ #include <asm/book3s/64/pgtable.h> #include <asm/bug.h> #include <asm/task_size_64.h> #include <asm/cpu_has_feature.h> /* * SLB */ #define SLB_NUM_BOLTED 2 #define SLB_CACHE_ENTRIES 8 #define SLB_MIN_SIZE 32 /* Bits in the SLB ESID word */ #define SLB_ESID_V ASM_CONST(0x0000000008000000) /* valid */ /* Bits in the SLB VSID word */ #define SLB_VSID_SHIFT 12 #define SLB_VSID_SHIFT_256M SLB_VSID_SHIFT #define SLB_VSID_SHIFT_1T 24 #define SLB_VSID_SSIZE_SHIFT 62 #define SLB_VSID_B ASM_CONST(0xc000000000000000) #define SLB_VSID_B_256M ASM_CONST(0x0000000000000000) #define SLB_VSID_B_1T ASM_CONST(0x4000000000000000) #define SLB_VSID_KS ASM_CONST(0x0000000000000800) #define SLB_VSID_KP ASM_CONST(0x0000000000000400) #define SLB_VSID_N ASM_CONST(0x0000000000000200) /* no-execute */ #define SLB_VSID_L ASM_CONST(0x0000000000000100) #define SLB_VSID_C ASM_CONST(0x0000000000000080) /* class */ #define SLB_VSID_LP ASM_CONST(0x0000000000000030) #define SLB_VSID_LP_00 ASM_CONST(0x0000000000000000) #define SLB_VSID_LP_01 ASM_CONST(0x0000000000000010) #define SLB_VSID_LP_10 ASM_CONST(0x0000000000000020) #define SLB_VSID_LP_11 ASM_CONST(0x0000000000000030) #define SLB_VSID_LLP (SLB_VSID_L|SLB_VSID_LP) #define SLB_VSID_KERNEL (SLB_VSID_KP) #define SLB_VSID_USER (SLB_VSID_KP|SLB_VSID_KS|SLB_VSID_C) #define SLBIE_C (0x08000000) #define SLBIE_SSIZE_SHIFT 25 /* * Hash table */ #define HPTES_PER_GROUP 8 #define HPTE_V_SSIZE_SHIFT 62 #define HPTE_V_AVPN_SHIFT 7 #define HPTE_V_COMMON_BITS ASM_CONST(0x000fffffffffffff) #define HPTE_V_AVPN ASM_CONST(0x3fffffffffffff80) #define HPTE_V_AVPN_3_0 ASM_CONST(0x000fffffffffff80) #define HPTE_V_AVPN_VAL(x) (((x) & HPTE_V_AVPN) >> HPTE_V_AVPN_SHIFT) #define HPTE_V_COMPARE(x,y) (!(((x) ^ (y)) & 0xffffffffffffff80UL)) #define HPTE_V_BOLTED ASM_CONST(0x0000000000000010) #define HPTE_V_LOCK ASM_CONST(0x0000000000000008) #define HPTE_V_LARGE ASM_CONST(0x0000000000000004) #define HPTE_V_SECONDARY ASM_CONST(0x0000000000000002) #define HPTE_V_VALID ASM_CONST(0x0000000000000001) /* * ISA 3.0 has a different HPTE format. */ #define HPTE_R_3_0_SSIZE_SHIFT 58 #define HPTE_R_3_0_SSIZE_MASK (3ull << HPTE_R_3_0_SSIZE_SHIFT) #define HPTE_R_PP0 ASM_CONST(0x8000000000000000) #define HPTE_R_TS ASM_CONST(0x4000000000000000) #define HPTE_R_KEY_HI ASM_CONST(0x3000000000000000) #define HPTE_R_KEY_BIT4 ASM_CONST(0x2000000000000000) #define HPTE_R_KEY_BIT3 ASM_CONST(0x1000000000000000) #define HPTE_R_RPN_SHIFT 12 #define HPTE_R_RPN ASM_CONST(0x0ffffffffffff000) #define HPTE_R_RPN_3_0 ASM_CONST(0x01fffffffffff000) #define HPTE_R_PP ASM_CONST(0x0000000000000003) #define HPTE_R_PPP ASM_CONST(0x8000000000000003) #define HPTE_R_N ASM_CONST(0x0000000000000004) #define HPTE_R_G ASM_CONST(0x0000000000000008) #define HPTE_R_M ASM_CONST(0x0000000000000010) #define HPTE_R_I ASM_CONST(0x0000000000000020) #define HPTE_R_W ASM_CONST(0x0000000000000040) #define HPTE_R_WIMG ASM_CONST(0x0000000000000078) #define HPTE_R_C ASM_CONST(0x0000000000000080) #define HPTE_R_R ASM_CONST(0x0000000000000100) #define HPTE_R_KEY_LO ASM_CONST(0x0000000000000e00) #define HPTE_R_KEY_BIT2 ASM_CONST(0x0000000000000800) #define HPTE_R_KEY_BIT1 ASM_CONST(0x0000000000000400) #define HPTE_R_KEY_BIT0 ASM_CONST(0x0000000000000200) #define HPTE_R_KEY (HPTE_R_KEY_LO | HPTE_R_KEY_HI) #define HPTE_V_1TB_SEG ASM_CONST(0x4000000000000000) #define HPTE_V_VRMA_MASK ASM_CONST(0x4001ffffff000000) /* Values for PP (assumes Ks=0, Kp=1) */ #define PP_RWXX 0 /* Supervisor read/write, User none */ #define PP_RWRX 1 /* Supervisor read/write, User read */ #define PP_RWRW 2 /* Supervisor read/write, User read/write */ #define PP_RXRX 3 /* Supervisor read, User read */ #define PP_RXXX (HPTE_R_PP0 | 2) /* Supervisor read, user none */ /* Fields for tlbiel instruction in architecture 2.06 */ #define TLBIEL_INVAL_SEL_MASK 0xc00 /* invalidation selector */ #define TLBIEL_INVAL_PAGE 0x000 /* invalidate a single page */ #define TLBIEL_INVAL_SET_LPID 0x800 /* invalidate a set for current LPID */ #define TLBIEL_INVAL_SET 0xc00 /* invalidate a set for all LPIDs */ #define TLBIEL_INVAL_SET_MASK 0xfff000 /* set number to inval. */ #define TLBIEL_INVAL_SET_SHIFT 12 #define POWER7_TLB_SETS 128 /* # sets in POWER7 TLB */ #define POWER8_TLB_SETS 512 /* # sets in POWER8 TLB */ #define POWER9_TLB_SETS_HASH 256 /* # sets in POWER9 TLB Hash mode */ #define POWER9_TLB_SETS_RADIX 128 /* # sets in POWER9 TLB Radix mode */ #ifndef __ASSEMBLY__ struct mmu_hash_ops { void (*hpte_invalidate)(unsigned long slot, unsigned long vpn, int bpsize, int apsize, int ssize, int local); long (*hpte_updatepp)(unsigned long slot, unsigned long newpp, unsigned long vpn, int bpsize, int apsize, int ssize, unsigned long flags); void (*hpte_updateboltedpp)(unsigned long newpp, unsigned long ea, int psize, int ssize); long (*hpte_insert)(unsigned long hpte_group, unsigned long vpn, unsigned long prpn, unsigned long rflags, unsigned long vflags, int psize, int apsize, int ssize); long (*hpte_remove)(unsigned long hpte_group); int (*hpte_removebolted)(unsigned long ea, int psize, int ssize); void (*flush_hash_range)(unsigned long number, int local); void (*hugepage_invalidate)(unsigned long vsid, unsigned long addr, unsigned char *hpte_slot_array, int psize, int ssize, int local); int (*resize_hpt)(unsigned long shift); /* * Special for kexec. * To be called in real mode with interrupts disabled. No locks are * taken as such, concurrent access on pre POWER5 hardware could result * in a deadlock. * The linear mapping is destroyed as well. */ void (*hpte_clear_all)(void); }; extern struct mmu_hash_ops mmu_hash_ops; struct hash_pte { __be64 v; __be64 r; }; extern struct hash_pte *htab_address; extern unsigned long htab_size_bytes; extern unsigned long htab_hash_mask; static inline int shift_to_mmu_psize(unsigned int shift) { int psize; for (psize = 0; psize < MMU_PAGE_COUNT; ++psize) if (mmu_psize_defs[psize].shift == shift) return psize; return -1; } static inline unsigned int mmu_psize_to_shift(unsigned int mmu_psize) { if (mmu_psize_defs[mmu_psize].shift) return mmu_psize_defs[mmu_psize].shift; BUG(); } static inline unsigned int ap_to_shift(unsigned long ap) { int psize; for (psize = 0; psize < MMU_PAGE_COUNT; psize++) { if (mmu_psize_defs[psize].ap == ap) return mmu_psize_defs[psize].shift; } return -1; } static inline unsigned long get_sllp_encoding(int psize) { unsigned long sllp; sllp = ((mmu_psize_defs[psize].sllp & SLB_VSID_L) >> 6) | ((mmu_psize_defs[psize].sllp & SLB_VSID_LP) >> 4); return sllp; } #endif /* __ASSEMBLY__ */ /* * Segment sizes. * These are the values used by hardware in the B field of * SLB entries and the first dword of MMU hashtable entries. * The B field is 2 bits; the values 2 and 3 are unused and reserved. */ #define MMU_SEGSIZE_256M 0 #define MMU_SEGSIZE_1T 1 /* * encode page number shift. * in order to fit the 78 bit va in a 64 bit variable we shift the va by * 12 bits. This enable us to address upto 76 bit va. * For hpt hash from a va we can ignore the page size bits of va and for * hpte encoding we ignore up to 23 bits of va. So ignoring lower 12 bits ensure * we work in all cases including 4k page size. */ #define VPN_SHIFT 12 /* * HPTE Large Page (LP) details */ #define LP_SHIFT 12 #define LP_BITS 8 #define LP_MASK(i) ((0xFF >> (i)) << LP_SHIFT) #ifndef __ASSEMBLY__ static inline int slb_vsid_shift(int ssize) { if (ssize == MMU_SEGSIZE_256M) return SLB_VSID_SHIFT; return SLB_VSID_SHIFT_1T; } static inline int segment_shift(int ssize) { if (ssize == MMU_SEGSIZE_256M) return SID_SHIFT; return SID_SHIFT_1T; } /* * This array is indexed by the LP field of the HPTE second dword. * Since this field may contain some RPN bits, some entries are * replicated so that we get the same value irrespective of RPN. * The top 4 bits are the page size index (MMU_PAGE_*) for the * actual page size, the bottom 4 bits are the base page size. */ extern u8 hpte_page_sizes[1 << LP_BITS]; static inline unsigned long __hpte_page_size(unsigned long h, unsigned long l, bool is_base_size) { unsigned int i, lp; if (!(h & HPTE_V_LARGE)) return 1ul << 12; /* Look at the 8 bit LP value */ lp = (l >> LP_SHIFT) & ((1 << LP_BITS) - 1); i = hpte_page_sizes[lp]; if (!i) return 0; if (!is_base_size) i >>= 4; return 1ul << mmu_psize_defs[i & 0xf].shift; } static inline unsigned long hpte_page_size(unsigned long h, unsigned long l) { return __hpte_page_size(h, l, 0); } static inline unsigned long hpte_base_page_size(unsigned long h, unsigned long l) { return __hpte_page_size(h, l, 1); } /* * The current system page and segment sizes */ extern int mmu_kernel_ssize; extern int mmu_highuser_ssize; extern u16 mmu_slb_size; extern unsigned long tce_alloc_start, tce_alloc_end; /* * If the processor supports 64k normal pages but not 64k cache * inhibited pages, we have to be prepared to switch processes * to use 4k pages when they create cache-inhibited mappings. * If this is the case, mmu_ci_restrictions will be set to 1. */ extern int mmu_ci_restrictions; /* * This computes the AVPN and B fields of the first dword of a HPTE, * for use when we want to match an existing PTE. The bottom 7 bits * of the returned value are zero. */ static inline unsigned long hpte_encode_avpn(unsigned long vpn, int psize, int ssize) { unsigned long v; /* * The AVA field omits the low-order 23 bits of the 78 bits VA. * These bits are not needed in the PTE, because the * low-order b of these bits are part of the byte offset * into the virtual page and, if b < 23, the high-order * 23-b of these bits are always used in selecting the * PTEGs to be searched */ v = (vpn >> (23 - VPN_SHIFT)) & ~(mmu_psize_defs[psize].avpnm); v <<= HPTE_V_AVPN_SHIFT; v |= ((unsigned long) ssize) << HPTE_V_SSIZE_SHIFT; return v; } /* * ISA v3.0 defines a new HPTE format, which differs from the old * format in having smaller AVPN and ARPN fields, and the B field * in the second dword instead of the first. */ static inline unsigned long hpte_old_to_new_v(unsigned long v) { /* trim AVPN, drop B */ return v & HPTE_V_COMMON_BITS; } static inline unsigned long hpte_old_to_new_r(unsigned long v, unsigned long r) { /* move B field from 1st to 2nd dword, trim ARPN */ return (r & ~HPTE_R_3_0_SSIZE_MASK) | (((v) >> HPTE_V_SSIZE_SHIFT) << HPTE_R_3_0_SSIZE_SHIFT); } static inline unsigned long hpte_new_to_old_v(unsigned long v, unsigned long r) { /* insert B field */ return (v & HPTE_V_COMMON_BITS) | ((r & HPTE_R_3_0_SSIZE_MASK) << (HPTE_V_SSIZE_SHIFT - HPTE_R_3_0_SSIZE_SHIFT)); } static inline unsigned long hpte_new_to_old_r(unsigned long r) { /* clear out B field */ return r & ~HPTE_R_3_0_SSIZE_MASK; } static inline unsigned long hpte_get_old_v(struct hash_pte *hptep) { unsigned long hpte_v; hpte_v = be64_to_cpu(hptep->v); if (cpu_has_feature(CPU_FTR_ARCH_300)) hpte_v = hpte_new_to_old_v(hpte_v, be64_to_cpu(hptep->r)); return hpte_v; } /* * This function sets the AVPN and L fields of the HPTE appropriately * using the base page size and actual page size. */ static inline unsigned long hpte_encode_v(unsigned long vpn, int base_psize, int actual_psize, int ssize) { unsigned long v; v = hpte_encode_avpn(vpn, base_psize, ssize); if (actual_psize != MMU_PAGE_4K) v |= HPTE_V_LARGE; return v; } /* * This function sets the ARPN, and LP fields of the HPTE appropriately * for the page size. We assume the pa is already "clean" that is properly * aligned for the requested page size */ static inline unsigned long hpte_encode_r(unsigned long pa, int base_psize, int actual_psize) { /* A 4K page needs no special encoding */ if (actual_psize == MMU_PAGE_4K) return pa & HPTE_R_RPN; else { unsigned int penc = mmu_psize_defs[base_psize].penc[actual_psize]; unsigned int shift = mmu_psize_defs[actual_psize].shift; return (pa & ~((1ul << shift) - 1)) | (penc << LP_SHIFT); } } /* * Build a VPN_SHIFT bit shifted va given VSID, EA and segment size. */ static inline unsigned long hpt_vpn(unsigned long ea, unsigned long vsid, int ssize) { unsigned long mask; int s_shift = segment_shift(ssize); mask = (1ul << (s_shift - VPN_SHIFT)) - 1; return (vsid << (s_shift - VPN_SHIFT)) | ((ea >> VPN_SHIFT) & mask); } /* * This hashes a virtual address */ static inline unsigned long hpt_hash(unsigned long vpn, unsigned int shift, int ssize) { unsigned long mask; unsigned long hash, vsid; /* VPN_SHIFT can be atmost 12 */ if (ssize == MMU_SEGSIZE_256M) { mask = (1ul << (SID_SHIFT - VPN_SHIFT)) - 1; hash = (vpn >> (SID_SHIFT - VPN_SHIFT)) ^ ((vpn & mask) >> (shift - VPN_SHIFT)); } else { mask = (1ul << (SID_SHIFT_1T - VPN_SHIFT)) - 1; vsid = vpn >> (SID_SHIFT_1T - VPN_SHIFT); hash = vsid ^ (vsid << 25) ^ ((vpn & mask) >> (shift - VPN_SHIFT)) ; } return hash & 0x7fffffffffUL; } #define HPTE_LOCAL_UPDATE 0x1 #define HPTE_NOHPTE_UPDATE 0x2 extern int __hash_page_4K(unsigned long ea, unsigned long access, unsigned long vsid, pte_t *ptep, unsigned long trap, unsigned long flags, int ssize, int subpage_prot); extern int __hash_page_64K(unsigned long ea, unsigned long access, unsigned long vsid, pte_t *ptep, unsigned long trap, unsigned long flags, int ssize); struct mm_struct; unsigned int hash_page_do_lazy_icache(unsigned int pp, pte_t pte, int trap); extern int hash_page_mm(struct mm_struct *mm, unsigned long ea, unsigned long access, unsigned long trap, unsigned long flags); extern int hash_page(unsigned long ea, unsigned long access, unsigned long trap, unsigned long dsisr); int __hash_page_huge(unsigned long ea, unsigned long access, unsigned long vsid, pte_t *ptep, unsigned long trap, unsigned long flags, int ssize, unsigned int shift, unsigned int mmu_psize); #ifdef CONFIG_TRANSPARENT_HUGEPAGE extern int __hash_page_thp(unsigned long ea, unsigned long access, unsigned long vsid, pmd_t *pmdp, unsigned long trap, unsigned long flags, int ssize, unsigned int psize); #else static inline int __hash_page_thp(unsigned long ea, unsigned long access, unsigned long vsid, pmd_t *pmdp, unsigned long trap, unsigned long flags, int ssize, unsigned int psize) { BUG(); return -1; } #endif extern void hash_failure_debug(unsigned long ea, unsigned long access, unsigned long vsid, unsigned long trap, int ssize, int psize, int lpsize, unsigned long pte); extern int htab_bolt_mapping(unsigned long vstart, unsigned long vend, unsigned long pstart, unsigned long prot, int psize, int ssize); int htab_remove_mapping(unsigned long vstart, unsigned long vend, int psize, int ssize); extern void pseries_add_gpage(u64 addr, u64 page_size, unsigned long number_of_pages); extern void demote_segment_4k(struct mm_struct *mm, unsigned long addr); extern void hash__setup_new_exec(void); #ifdef CONFIG_PPC_PSERIES void hpte_init_pseries(void); #else static inline void hpte_init_pseries(void) { } #endif extern void hpte_init_native(void); struct slb_entry { u64 esid; u64 vsid; }; extern void slb_initialize(void); void slb_flush_and_restore_bolted(void); void slb_flush_all_realmode(void); void __slb_restore_bolted_realmode(void); void slb_restore_bolted_realmode(void); void slb_save_contents(struct slb_entry *slb_ptr); void slb_dump_contents(struct slb_entry *slb_ptr); extern void slb_vmalloc_update(void); extern void slb_set_size(u16 size); #endif /* __ASSEMBLY__ */ /* * VSID allocation (256MB segment) * * We first generate a 37-bit "proto-VSID". Proto-VSIDs are generated * from mmu context id and effective segment id of the address. * * For user processes max context id is limited to MAX_USER_CONTEXT. * more details in get_user_context * * For kernel space get_kernel_context * * The proto-VSIDs are then scrambled into real VSIDs with the * multiplicative hash: * * VSID = (proto-VSID * VSID_MULTIPLIER) % VSID_MODULUS * * VSID_MULTIPLIER is prime, so in particular it is * co-prime to VSID_MODULUS, making this a 1:1 scrambling function. * Because the modulus is 2^n-1 we can compute it efficiently without * a divide or extra multiply (see below). The scramble function gives * robust scattering in the hash table (at least based on some initial * results). * * We use VSID 0 to indicate an invalid VSID. The means we can't use context id * 0, because a context id of 0 and an EA of 0 gives a proto-VSID of 0, which * will produce a VSID of 0. * * We also need to avoid the last segment of the last context, because that * would give a protovsid of 0x1fffffffff. That will result in a VSID 0 * because of the modulo operation in vsid scramble. */ /* * Max Va bits we support as of now is 68 bits. We want 19 bit * context ID. * Restrictions: * GPU has restrictions of not able to access beyond 128TB * (47 bit effective address). We also cannot do more than 20bit PID. * For p4 and p5 which can only do 65 bit VA, we restrict our CONTEXT_BITS * to 16 bits (ie, we can only have 2^16 pids at the same time). */ #define VA_BITS 68 #define CONTEXT_BITS 19 #define ESID_BITS (VA_BITS - (SID_SHIFT + CONTEXT_BITS)) #define ESID_BITS_1T (VA_BITS - (SID_SHIFT_1T + CONTEXT_BITS)) #define ESID_BITS_MASK ((1 << ESID_BITS) - 1) #define ESID_BITS_1T_MASK ((1 << ESID_BITS_1T) - 1) /* * Now certain config support MAX_PHYSMEM more than 512TB. Hence we will need * to use more than one context for linear mapping the kernel. * For vmalloc and memmap, we use just one context with 512TB. With 64 byte * struct page size, we need ony 32 TB in memmap for 2PB (51 bits (MAX_PHYSMEM_BITS)). */ #if (MAX_PHYSMEM_BITS > MAX_EA_BITS_PER_CONTEXT) #define MAX_KERNEL_CTX_CNT (1UL << (MAX_PHYSMEM_BITS - MAX_EA_BITS_PER_CONTEXT)) #else #define MAX_KERNEL_CTX_CNT 1 #endif #define MAX_VMALLOC_CTX_CNT 1 #define MAX_IO_CTX_CNT 1 #define MAX_VMEMMAP_CTX_CNT 1 /* * 256MB segment * The proto-VSID space has 2^(CONTEX_BITS + ESID_BITS) - 1 segments * available for user + kernel mapping. VSID 0 is reserved as invalid, contexts * 1-4 are used for kernel mapping. Each segment contains 2^28 bytes. Each * context maps 2^49 bytes (512TB). * * We also need to avoid the last segment of the last context, because that * would give a protovsid of 0x1fffffffff. That will result in a VSID 0 * because of the modulo operation in vsid scramble. * */ #define MAX_USER_CONTEXT ((ASM_CONST(1) << CONTEXT_BITS) - 2) // The + 2 accounts for INVALID_REGION and 1 more to avoid overlap with kernel #define MIN_USER_CONTEXT (MAX_KERNEL_CTX_CNT + MAX_VMALLOC_CTX_CNT + \ MAX_IO_CTX_CNT + MAX_VMEMMAP_CTX_CNT + 2) /* * For platforms that support on 65bit VA we limit the context bits */ #define MAX_USER_CONTEXT_65BIT_VA ((ASM_CONST(1) << (65 - (SID_SHIFT + ESID_BITS))) - 2) /* * This should be computed such that protovosid * vsid_mulitplier * doesn't overflow 64 bits. The vsid_mutliplier should also be * co-prime to vsid_modulus. We also need to make sure that number * of bits in multiplied result (dividend) is less than twice the number of * protovsid bits for our modulus optmization to work. * * The below table shows the current values used. * |-------+------------+----------------------+------------+-------------------| * | | Prime Bits | proto VSID_BITS_65VA | Total Bits | 2* prot VSID_BITS | * |-------+------------+----------------------+------------+-------------------| * | 1T | 24 | 25 | 49 | 50 | * |-------+------------+----------------------+------------+-------------------| * | 256MB | 24 | 37 | 61 | 74 | * |-------+------------+----------------------+------------+-------------------| * * |-------+------------+----------------------+------------+--------------------| * | | Prime Bits | proto VSID_BITS_68VA | Total Bits | 2* proto VSID_BITS | * |-------+------------+----------------------+------------+--------------------| * | 1T | 24 | 28 | 52 | 56 | * |-------+------------+----------------------+------------+--------------------| * | 256MB | 24 | 40 | 64 | 80 | * |-------+------------+----------------------+------------+--------------------| * */ #define VSID_MULTIPLIER_256M ASM_CONST(12538073) /* 24-bit prime */ #define VSID_BITS_256M (VA_BITS - SID_SHIFT) #define VSID_BITS_65_256M (65 - SID_SHIFT) /* * Modular multiplicative inverse of VSID_MULTIPLIER under modulo VSID_MODULUS */ #define VSID_MULINV_256M ASM_CONST(665548017062) #define VSID_MULTIPLIER_1T ASM_CONST(12538073) /* 24-bit prime */ #define VSID_BITS_1T (VA_BITS - SID_SHIFT_1T) #define VSID_BITS_65_1T (65 - SID_SHIFT_1T) #define VSID_MULINV_1T ASM_CONST(209034062) /* 1TB VSID reserved for VRMA */ #define VRMA_VSID 0x1ffffffUL #define USER_VSID_RANGE (1UL << (ESID_BITS + SID_SHIFT)) /* 4 bits per slice and we have one slice per 1TB */ #define SLICE_ARRAY_SIZE (H_PGTABLE_RANGE >> 41) #define LOW_SLICE_ARRAY_SZ (BITS_PER_LONG / BITS_PER_BYTE) #define TASK_SLICE_ARRAY_SZ(x) ((x)->hash_context->slb_addr_limit >> 41) #ifndef __ASSEMBLY__ #ifdef CONFIG_PPC_SUBPAGE_PROT /* * For the sub-page protection option, we extend the PGD with one of * these. Basically we have a 3-level tree, with the top level being * the protptrs array. To optimize speed and memory consumption when * only addresses < 4GB are being protected, pointers to the first * four pages of sub-page protection words are stored in the low_prot * array. * Each page of sub-page protection words protects 1GB (4 bytes * protects 64k). For the 3-level tree, each page of pointers then * protects 8TB. */ struct subpage_prot_table { unsigned long maxaddr; /* only addresses < this are protected */ unsigned int **protptrs[(TASK_SIZE_USER64 >> 43)]; unsigned int *low_prot[4]; }; #define SBP_L1_BITS (PAGE_SHIFT - 2) #define SBP_L2_BITS (PAGE_SHIFT - 3) #define SBP_L1_COUNT (1 << SBP_L1_BITS) #define SBP_L2_COUNT (1 << SBP_L2_BITS) #define SBP_L2_SHIFT (PAGE_SHIFT + SBP_L1_BITS) #define SBP_L3_SHIFT (SBP_L2_SHIFT + SBP_L2_BITS) extern void subpage_prot_free(struct mm_struct *mm); #else static inline void subpage_prot_free(struct mm_struct *mm) {} #endif /* CONFIG_PPC_SUBPAGE_PROT */ /* * One bit per slice. We have lower slices which cover 256MB segments * upto 4G range. That gets us 16 low slices. For the rest we track slices * in 1TB size. */ struct slice_mask { u64 low_slices; DECLARE_BITMAP(high_slices, SLICE_NUM_HIGH); }; struct hash_mm_context { u16 user_psize; /* page size index */ /* SLB page size encodings*/ unsigned char low_slices_psize[LOW_SLICE_ARRAY_SZ]; unsigned char high_slices_psize[SLICE_ARRAY_SIZE]; unsigned long slb_addr_limit; #ifdef CONFIG_PPC_64K_PAGES struct slice_mask mask_64k; #endif struct slice_mask mask_4k; #ifdef CONFIG_HUGETLB_PAGE struct slice_mask mask_16m; struct slice_mask mask_16g; #endif #ifdef CONFIG_PPC_SUBPAGE_PROT struct subpage_prot_table *spt; #endif /* CONFIG_PPC_SUBPAGE_PROT */ }; #if 0 /* * The code below is equivalent to this function for arguments * < 2^VSID_BITS, which is all this should ever be called * with. However gcc is not clever enough to compute the * modulus (2^n-1) without a second multiply. */ #define vsid_scramble(protovsid, size) \ ((((protovsid) * VSID_MULTIPLIER_##size) % VSID_MODULUS_##size)) /* simplified form avoiding mod operation */ #define vsid_scramble(protovsid, size) \ ({ \ unsigned long x; \ x = (protovsid) * VSID_MULTIPLIER_##size; \ x = (x >> VSID_BITS_##size) + (x & VSID_MODULUS_##size); \ (x + ((x+1) >> VSID_BITS_##size)) & VSID_MODULUS_##size; \ }) #else /* 1 */ static inline unsigned long vsid_scramble(unsigned long protovsid, unsigned long vsid_multiplier, int vsid_bits) { unsigned long vsid; unsigned long vsid_modulus = ((1UL << vsid_bits) - 1); /* * We have same multipler for both 256 and 1T segements now */ vsid = protovsid * vsid_multiplier; vsid = (vsid >> vsid_bits) + (vsid & vsid_modulus); return (vsid + ((vsid + 1) >> vsid_bits)) & vsid_modulus; } #endif /* 1 */ /* Returns the segment size indicator for a user address */ static inline int user_segment_size(unsigned long addr) { /* Use 1T segments if possible for addresses >= 1T */ if (addr >= (1UL << SID_SHIFT_1T)) return mmu_highuser_ssize; return MMU_SEGSIZE_256M; } static inline unsigned long get_vsid(unsigned long context, unsigned long ea, int ssize) { unsigned long va_bits = VA_BITS; unsigned long vsid_bits; unsigned long protovsid; /* * Bad address. We return VSID 0 for that */ if ((ea & EA_MASK) >= H_PGTABLE_RANGE) return 0; if (!mmu_has_feature(MMU_FTR_68_BIT_VA)) va_bits = 65; if (ssize == MMU_SEGSIZE_256M) { vsid_bits = va_bits - SID_SHIFT; protovsid = (context << ESID_BITS) | ((ea >> SID_SHIFT) & ESID_BITS_MASK); return vsid_scramble(protovsid, VSID_MULTIPLIER_256M, vsid_bits); } /* 1T segment */ vsid_bits = va_bits - SID_SHIFT_1T; protovsid = (context << ESID_BITS_1T) | ((ea >> SID_SHIFT_1T) & ESID_BITS_1T_MASK); return vsid_scramble(protovsid, VSID_MULTIPLIER_1T, vsid_bits); } /* * For kernel space, we use context ids as * below. Range is 512TB per context. * * 0x00001 - [ 0xc000000000000000 - 0xc001ffffffffffff] * 0x00002 - [ 0xc002000000000000 - 0xc003ffffffffffff] * 0x00003 - [ 0xc004000000000000 - 0xc005ffffffffffff] * 0x00004 - [ 0xc006000000000000 - 0xc007ffffffffffff] * * vmap, IO, vmemap * * 0x00005 - [ 0xc008000000000000 - 0xc009ffffffffffff] * 0x00006 - [ 0xc00a000000000000 - 0xc00bffffffffffff] * 0x00007 - [ 0xc00c000000000000 - 0xc00dffffffffffff] * */ static inline unsigned long get_kernel_context(unsigned long ea) { unsigned long region_id = get_region_id(ea); unsigned long ctx; /* * Depending on Kernel config, kernel region can have one context * or more. */ if (region_id == LINEAR_MAP_REGION_ID) { /* * We already verified ea to be not beyond the addr limit. */ ctx = 1 + ((ea & EA_MASK) >> MAX_EA_BITS_PER_CONTEXT); } else ctx = region_id + MAX_KERNEL_CTX_CNT - 1; return ctx; } /* * This is only valid for addresses >= PAGE_OFFSET */ static inline unsigned long get_kernel_vsid(unsigned long ea, int ssize) { unsigned long context; if (!is_kernel_addr(ea)) return 0; context = get_kernel_context(ea); return get_vsid(context, ea, ssize); } unsigned htab_shift_for_mem_size(unsigned long mem_size); #endif /* __ASSEMBLY__ */ #endif /* _ASM_POWERPC_BOOK3S_64_MMU_HASH_H_ */ |