1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * S390 version 4 * Copyright IBM Corp. 1999, 2000 5 * Author(s): Hartmut Penner (hp@de.ibm.com) 6 * Ulrich Weigand (weigand@de.ibm.com) 7 * Martin Schwidefsky (schwidefsky@de.ibm.com) 8 * 9 * Derived from "include/asm-i386/pgtable.h" 10 */ 11 12 #ifndef _ASM_S390_PGTABLE_H 13 #define _ASM_S390_PGTABLE_H 14 15 #include <linux/sched.h> 16 #include <linux/mm_types.h> 17 #include <linux/cpufeature.h> 18 #include <linux/page-flags.h> 19 #include <linux/radix-tree.h> 20 #include <linux/atomic.h> 21 #include <asm/ctlreg.h> 22 #include <asm/bug.h> 23 #include <asm/page.h> 24 #include <asm/uv.h> 25 26 extern pgd_t swapper_pg_dir[]; 27 extern pgd_t invalid_pg_dir[]; 28 extern void paging_init(void); 29 extern struct ctlreg s390_invalid_asce; 30 31 enum { 32 PG_DIRECT_MAP_4K = 0, 33 PG_DIRECT_MAP_1M, 34 PG_DIRECT_MAP_2G, 35 PG_DIRECT_MAP_MAX 36 }; 37 38 extern atomic_long_t direct_pages_count[PG_DIRECT_MAP_MAX]; 39 40 static inline void update_page_count(int level, long count) 41 { 42 if (IS_ENABLED(CONFIG_PROC_FS)) 43 atomic_long_add(count, &direct_pages_count[level]); 44 } 45 46 /* 47 * The S390 doesn't have any external MMU info: the kernel page 48 * tables contain all the necessary information. 49 */ 50 #define update_mmu_cache(vma, address, ptep) do { } while (0) 51 #define update_mmu_cache_range(vmf, vma, addr, ptep, nr) do { } while (0) 52 #define update_mmu_cache_pmd(vma, address, ptep) do { } while (0) 53 54 /* 55 * ZERO_PAGE is a global shared page that is always zero; used 56 * for zero-mapped memory areas etc.. 57 */ 58 59 extern unsigned long empty_zero_page; 60 extern unsigned long zero_page_mask; 61 62 #define ZERO_PAGE(vaddr) \ 63 (virt_to_page((void *)(empty_zero_page + \ 64 (((unsigned long)(vaddr)) &zero_page_mask)))) 65 #define __HAVE_COLOR_ZERO_PAGE 66 67 /* TODO: s390 cannot support io_remap_pfn_range... */ 68 69 #define pte_ERROR(e) \ 70 pr_err("%s:%d: bad pte %016lx.\n", __FILE__, __LINE__, pte_val(e)) 71 #define pmd_ERROR(e) \ 72 pr_err("%s:%d: bad pmd %016lx.\n", __FILE__, __LINE__, pmd_val(e)) 73 #define pud_ERROR(e) \ 74 pr_err("%s:%d: bad pud %016lx.\n", __FILE__, __LINE__, pud_val(e)) 75 #define p4d_ERROR(e) \ 76 pr_err("%s:%d: bad p4d %016lx.\n", __FILE__, __LINE__, p4d_val(e)) 77 #define pgd_ERROR(e) \ 78 pr_err("%s:%d: bad pgd %016lx.\n", __FILE__, __LINE__, pgd_val(e)) 79 80 /* 81 * The vmalloc and module area will always be on the topmost area of the 82 * kernel mapping. 512GB are reserved for vmalloc by default. 83 * At the top of the vmalloc area a 2GB area is reserved where modules 84 * will reside. That makes sure that inter module branches always 85 * happen without trampolines and in addition the placement within a 86 * 2GB frame is branch prediction unit friendly. 87 */ 88 extern unsigned long VMALLOC_START; 89 extern unsigned long VMALLOC_END; 90 #define VMALLOC_DEFAULT_SIZE ((512UL << 30) - MODULES_LEN) 91 extern struct page *vmemmap; 92 extern unsigned long vmemmap_size; 93 94 extern unsigned long MODULES_VADDR; 95 extern unsigned long MODULES_END; 96 #define MODULES_VADDR MODULES_VADDR 97 #define MODULES_END MODULES_END 98 #define MODULES_LEN (1UL << 31) 99 100 static inline int is_module_addr(void *addr) 101 { 102 BUILD_BUG_ON(MODULES_LEN > (1UL << 31)); 103 if (addr < (void *)MODULES_VADDR) 104 return 0; 105 if (addr > (void *)MODULES_END) 106 return 0; 107 return 1; 108 } 109 110 #ifdef CONFIG_KMSAN 111 #define KMSAN_VMALLOC_SIZE (VMALLOC_END - VMALLOC_START) 112 #define KMSAN_VMALLOC_SHADOW_START VMALLOC_END 113 #define KMSAN_VMALLOC_SHADOW_END (KMSAN_VMALLOC_SHADOW_START + KMSAN_VMALLOC_SIZE) 114 #define KMSAN_VMALLOC_ORIGIN_START KMSAN_VMALLOC_SHADOW_END 115 #define KMSAN_VMALLOC_ORIGIN_END (KMSAN_VMALLOC_ORIGIN_START + KMSAN_VMALLOC_SIZE) 116 #define KMSAN_MODULES_SHADOW_START KMSAN_VMALLOC_ORIGIN_END 117 #define KMSAN_MODULES_SHADOW_END (KMSAN_MODULES_SHADOW_START + MODULES_LEN) 118 #define KMSAN_MODULES_ORIGIN_START KMSAN_MODULES_SHADOW_END 119 #define KMSAN_MODULES_ORIGIN_END (KMSAN_MODULES_ORIGIN_START + MODULES_LEN) 120 #endif 121 122 #ifdef CONFIG_RANDOMIZE_BASE 123 #define KASLR_LEN (1UL << 31) 124 #else 125 #define KASLR_LEN 0UL 126 #endif 127 128 void setup_protection_map(void); 129 130 /* 131 * A 64 bit pagetable entry of S390 has following format: 132 * | PFRA |0IPC| OS | 133 * 0000000000111111111122222222223333333333444444444455555555556666 134 * 0123456789012345678901234567890123456789012345678901234567890123 135 * 136 * I Page-Invalid Bit: Page is not available for address-translation 137 * P Page-Protection Bit: Store access not possible for page 138 * C Change-bit override: HW is not required to set change bit 139 * 140 * A 64 bit segmenttable entry of S390 has following format: 141 * | P-table origin | TT 142 * 0000000000111111111122222222223333333333444444444455555555556666 143 * 0123456789012345678901234567890123456789012345678901234567890123 144 * 145 * I Segment-Invalid Bit: Segment is not available for address-translation 146 * C Common-Segment Bit: Segment is not private (PoP 3-30) 147 * P Page-Protection Bit: Store access not possible for page 148 * TT Type 00 149 * 150 * A 64 bit region table entry of S390 has following format: 151 * | S-table origin | TF TTTL 152 * 0000000000111111111122222222223333333333444444444455555555556666 153 * 0123456789012345678901234567890123456789012345678901234567890123 154 * 155 * I Segment-Invalid Bit: Segment is not available for address-translation 156 * TT Type 01 157 * TF 158 * TL Table length 159 * 160 * The 64 bit regiontable origin of S390 has following format: 161 * | region table origon | DTTL 162 * 0000000000111111111122222222223333333333444444444455555555556666 163 * 0123456789012345678901234567890123456789012345678901234567890123 164 * 165 * X Space-Switch event: 166 * G Segment-Invalid Bit: 167 * P Private-Space Bit: 168 * S Storage-Alteration: 169 * R Real space 170 * TL Table-Length: 171 * 172 * A storage key has the following format: 173 * | ACC |F|R|C|0| 174 * 0 3 4 5 6 7 175 * ACC: access key 176 * F : fetch protection bit 177 * R : referenced bit 178 * C : changed bit 179 */ 180 181 /* Hardware bits in the page table entry */ 182 #define _PAGE_NOEXEC 0x100 /* HW no-execute bit */ 183 #define _PAGE_PROTECT 0x200 /* HW read-only bit */ 184 #define _PAGE_INVALID 0x400 /* HW invalid bit */ 185 #define _PAGE_LARGE 0x800 /* Bit to mark a large pte */ 186 187 /* Software bits in the page table entry */ 188 #define _PAGE_PRESENT 0x001 /* SW pte present bit */ 189 #define _PAGE_YOUNG 0x004 /* SW pte young bit */ 190 #define _PAGE_DIRTY 0x008 /* SW pte dirty bit */ 191 #define _PAGE_READ 0x010 /* SW pte read bit */ 192 #define _PAGE_WRITE 0x020 /* SW pte write bit */ 193 #define _PAGE_SPECIAL 0x040 /* SW associated with special page */ 194 #define _PAGE_UNUSED 0x080 /* SW bit for pgste usage state */ 195 196 #ifdef CONFIG_MEM_SOFT_DIRTY 197 #define _PAGE_SOFT_DIRTY 0x002 /* SW pte soft dirty bit */ 198 #else 199 #define _PAGE_SOFT_DIRTY 0x000 200 #endif 201 202 #define _PAGE_SW_BITS 0xffUL /* All SW bits */ 203 204 #define _PAGE_SWP_EXCLUSIVE _PAGE_LARGE /* SW pte exclusive swap bit */ 205 206 /* Set of bits not changed in pte_modify */ 207 #define _PAGE_CHG_MASK (PAGE_MASK | _PAGE_SPECIAL | _PAGE_DIRTY | \ 208 _PAGE_YOUNG | _PAGE_SOFT_DIRTY) 209 210 /* 211 * Mask of bits that must not be changed with RDP. Allow only _PAGE_PROTECT 212 * HW bit and all SW bits. 213 */ 214 #define _PAGE_RDP_MASK ~(_PAGE_PROTECT | _PAGE_SW_BITS) 215 216 /* 217 * handle_pte_fault uses pte_present and pte_none to find out the pte type 218 * WITHOUT holding the page table lock. The _PAGE_PRESENT bit is used to 219 * distinguish present from not-present ptes. It is changed only with the page 220 * table lock held. 221 * 222 * The following table gives the different possible bit combinations for 223 * the pte hardware and software bits in the last 12 bits of a pte 224 * (. unassigned bit, x don't care, t swap type): 225 * 226 * 842100000000 227 * 000084210000 228 * 000000008421 229 * .IR.uswrdy.p 230 * empty .10.00000000 231 * swap .11..ttttt.0 232 * prot-none, clean, old .11.xx0000.1 233 * prot-none, clean, young .11.xx0001.1 234 * prot-none, dirty, old .11.xx0010.1 235 * prot-none, dirty, young .11.xx0011.1 236 * read-only, clean, old .11.xx0100.1 237 * read-only, clean, young .01.xx0101.1 238 * read-only, dirty, old .11.xx0110.1 239 * read-only, dirty, young .01.xx0111.1 240 * read-write, clean, old .11.xx1100.1 241 * read-write, clean, young .01.xx1101.1 242 * read-write, dirty, old .10.xx1110.1 243 * read-write, dirty, young .00.xx1111.1 244 * HW-bits: R read-only, I invalid 245 * SW-bits: p present, y young, d dirty, r read, w write, s special, 246 * u unused, l large 247 * 248 * pte_none is true for the bit pattern .10.00000000, pte == 0x400 249 * pte_swap is true for the bit pattern .11..ooooo.0, (pte & 0x201) == 0x200 250 * pte_present is true for the bit pattern .xx.xxxxxx.1, (pte & 0x001) == 0x001 251 */ 252 253 /* Bits in the segment/region table address-space-control-element */ 254 #define _ASCE_ORIGIN ~0xfffUL/* region/segment table origin */ 255 #define _ASCE_PRIVATE_SPACE 0x100 /* private space control */ 256 #define _ASCE_ALT_EVENT 0x80 /* storage alteration event control */ 257 #define _ASCE_SPACE_SWITCH 0x40 /* space switch event */ 258 #define _ASCE_REAL_SPACE 0x20 /* real space control */ 259 #define _ASCE_TYPE_MASK 0x0c /* asce table type mask */ 260 #define _ASCE_TYPE_REGION1 0x0c /* region first table type */ 261 #define _ASCE_TYPE_REGION2 0x08 /* region second table type */ 262 #define _ASCE_TYPE_REGION3 0x04 /* region third table type */ 263 #define _ASCE_TYPE_SEGMENT 0x00 /* segment table type */ 264 #define _ASCE_TABLE_LENGTH 0x03 /* region table length */ 265 266 /* Bits in the region table entry */ 267 #define _REGION_ENTRY_ORIGIN ~0xfffUL/* region/segment table origin */ 268 #define _REGION_ENTRY_PROTECT 0x200 /* region protection bit */ 269 #define _REGION_ENTRY_NOEXEC 0x100 /* region no-execute bit */ 270 #define _REGION_ENTRY_OFFSET 0xc0 /* region table offset */ 271 #define _REGION_ENTRY_INVALID 0x20 /* invalid region table entry */ 272 #define _REGION_ENTRY_TYPE_MASK 0x0c /* region table type mask */ 273 #define _REGION_ENTRY_TYPE_R1 0x0c /* region first table type */ 274 #define _REGION_ENTRY_TYPE_R2 0x08 /* region second table type */ 275 #define _REGION_ENTRY_TYPE_R3 0x04 /* region third table type */ 276 #define _REGION_ENTRY_LENGTH 0x03 /* region third length */ 277 278 #define _REGION1_ENTRY (_REGION_ENTRY_TYPE_R1 | _REGION_ENTRY_LENGTH) 279 #define _REGION1_ENTRY_EMPTY (_REGION_ENTRY_TYPE_R1 | _REGION_ENTRY_INVALID) 280 #define _REGION2_ENTRY (_REGION_ENTRY_TYPE_R2 | _REGION_ENTRY_LENGTH) 281 #define _REGION2_ENTRY_EMPTY (_REGION_ENTRY_TYPE_R2 | _REGION_ENTRY_INVALID) 282 #define _REGION3_ENTRY (_REGION_ENTRY_TYPE_R3 | _REGION_ENTRY_LENGTH | \ 283 _REGION3_ENTRY_PRESENT) 284 #define _REGION3_ENTRY_EMPTY (_REGION_ENTRY_TYPE_R3 | _REGION_ENTRY_INVALID) 285 286 #define _REGION3_ENTRY_HARDWARE_BITS 0xfffffffffffff6ffUL 287 #define _REGION3_ENTRY_HARDWARE_BITS_LARGE 0xffffffff8001073cUL 288 #define _REGION3_ENTRY_ORIGIN_LARGE ~0x7fffffffUL /* large page address */ 289 #define _REGION3_ENTRY_DIRTY 0x2000 /* SW region dirty bit */ 290 #define _REGION3_ENTRY_YOUNG 0x1000 /* SW region young bit */ 291 #define _REGION3_ENTRY_COMM 0x0010 /* Common-Region, marks swap entry */ 292 #define _REGION3_ENTRY_LARGE 0x0400 /* RTTE-format control, large page */ 293 #define _REGION3_ENTRY_WRITE 0x8000 /* SW region write bit */ 294 #define _REGION3_ENTRY_READ 0x4000 /* SW region read bit */ 295 296 #ifdef CONFIG_MEM_SOFT_DIRTY 297 #define _REGION3_ENTRY_SOFT_DIRTY 0x0002 /* SW region soft dirty bit */ 298 #else 299 #define _REGION3_ENTRY_SOFT_DIRTY 0x0000 /* SW region soft dirty bit */ 300 #endif 301 302 #define _REGION_ENTRY_BITS 0xfffffffffffff22fUL 303 304 /* 305 * SW region present bit. For non-leaf region-third-table entries, bits 62-63 306 * indicate the TABLE LENGTH and both must be set to 1. But such entries 307 * would always be considered as present, so it is safe to use bit 63 as 308 * PRESENT bit for PUD. 309 */ 310 #define _REGION3_ENTRY_PRESENT 0x0001 311 312 /* Bits in the segment table entry */ 313 #define _SEGMENT_ENTRY_BITS 0xfffffffffffffe3fUL 314 #define _SEGMENT_ENTRY_HARDWARE_BITS 0xfffffffffffffe3cUL 315 #define _SEGMENT_ENTRY_HARDWARE_BITS_LARGE 0xfffffffffff1073cUL 316 #define _SEGMENT_ENTRY_ORIGIN_LARGE ~0xfffffUL /* large page address */ 317 #define _SEGMENT_ENTRY_ORIGIN ~0x7ffUL/* page table origin */ 318 #define _SEGMENT_ENTRY_PROTECT 0x200 /* segment protection bit */ 319 #define _SEGMENT_ENTRY_NOEXEC 0x100 /* segment no-execute bit */ 320 #define _SEGMENT_ENTRY_INVALID 0x20 /* invalid segment table entry */ 321 #define _SEGMENT_ENTRY_TYPE_MASK 0x0c /* segment table type mask */ 322 323 #define _SEGMENT_ENTRY (_SEGMENT_ENTRY_PRESENT) 324 #define _SEGMENT_ENTRY_EMPTY (_SEGMENT_ENTRY_INVALID) 325 326 #define _SEGMENT_ENTRY_DIRTY 0x2000 /* SW segment dirty bit */ 327 #define _SEGMENT_ENTRY_YOUNG 0x1000 /* SW segment young bit */ 328 329 #define _SEGMENT_ENTRY_COMM 0x0010 /* Common-Segment, marks swap entry */ 330 #define _SEGMENT_ENTRY_LARGE 0x0400 /* STE-format control, large page */ 331 #define _SEGMENT_ENTRY_WRITE 0x8000 /* SW segment write bit */ 332 #define _SEGMENT_ENTRY_READ 0x4000 /* SW segment read bit */ 333 334 #ifdef CONFIG_MEM_SOFT_DIRTY 335 #define _SEGMENT_ENTRY_SOFT_DIRTY 0x0002 /* SW segment soft dirty bit */ 336 #else 337 #define _SEGMENT_ENTRY_SOFT_DIRTY 0x0000 /* SW segment soft dirty bit */ 338 #endif 339 340 #define _SEGMENT_ENTRY_PRESENT 0x0001 /* SW segment present bit */ 341 342 /* Common bits in region and segment table entries, for swap entries */ 343 #define _RST_ENTRY_COMM 0x0010 /* Common-Region/Segment, marks swap entry */ 344 #define _RST_ENTRY_INVALID 0x0020 /* invalid region/segment table entry */ 345 346 #define _CRST_ENTRIES 2048 /* number of region/segment table entries */ 347 #define _PAGE_ENTRIES 256 /* number of page table entries */ 348 349 #define _CRST_TABLE_SIZE (_CRST_ENTRIES * 8) 350 #define _PAGE_TABLE_SIZE (_PAGE_ENTRIES * 8) 351 352 #define _REGION1_SHIFT 53 353 #define _REGION2_SHIFT 42 354 #define _REGION3_SHIFT 31 355 #define _SEGMENT_SHIFT 20 356 357 #define _REGION1_INDEX (0x7ffUL << _REGION1_SHIFT) 358 #define _REGION2_INDEX (0x7ffUL << _REGION2_SHIFT) 359 #define _REGION3_INDEX (0x7ffUL << _REGION3_SHIFT) 360 #define _SEGMENT_INDEX (0x7ffUL << _SEGMENT_SHIFT) 361 #define _PAGE_INDEX (0xffUL << PAGE_SHIFT) 362 363 #define _REGION1_SIZE (1UL << _REGION1_SHIFT) 364 #define _REGION2_SIZE (1UL << _REGION2_SHIFT) 365 #define _REGION3_SIZE (1UL << _REGION3_SHIFT) 366 #define _SEGMENT_SIZE (1UL << _SEGMENT_SHIFT) 367 368 #define _REGION1_MASK (~(_REGION1_SIZE - 1)) 369 #define _REGION2_MASK (~(_REGION2_SIZE - 1)) 370 #define _REGION3_MASK (~(_REGION3_SIZE - 1)) 371 #define _SEGMENT_MASK (~(_SEGMENT_SIZE - 1)) 372 373 #define PMD_SHIFT _SEGMENT_SHIFT 374 #define PUD_SHIFT _REGION3_SHIFT 375 #define P4D_SHIFT _REGION2_SHIFT 376 #define PGDIR_SHIFT _REGION1_SHIFT 377 378 #define PMD_SIZE _SEGMENT_SIZE 379 #define PUD_SIZE _REGION3_SIZE 380 #define P4D_SIZE _REGION2_SIZE 381 #define PGDIR_SIZE _REGION1_SIZE 382 383 #define PMD_MASK _SEGMENT_MASK 384 #define PUD_MASK _REGION3_MASK 385 #define P4D_MASK _REGION2_MASK 386 #define PGDIR_MASK _REGION1_MASK 387 388 #define PTRS_PER_PTE _PAGE_ENTRIES 389 #define PTRS_PER_PMD _CRST_ENTRIES 390 #define PTRS_PER_PUD _CRST_ENTRIES 391 #define PTRS_PER_P4D _CRST_ENTRIES 392 #define PTRS_PER_PGD _CRST_ENTRIES 393 394 /* 395 * Segment table and region3 table entry encoding 396 * (R = read-only, I = invalid, y = young bit): 397 * dy..R...I...wr 398 * prot-none, clean, old 00..1...1...00 399 * prot-none, clean, young 01..1...1...00 400 * prot-none, dirty, old 10..1...1...00 401 * prot-none, dirty, young 11..1...1...00 402 * read-only, clean, old 00..1...1...01 403 * read-only, clean, young 01..1...0...01 404 * read-only, dirty, old 10..1...1...01 405 * read-only, dirty, young 11..1...0...01 406 * read-write, clean, old 00..1...1...11 407 * read-write, clean, young 01..1...0...11 408 * read-write, dirty, old 10..0...1...11 409 * read-write, dirty, young 11..0...0...11 410 * The segment table origin is used to distinguish empty (origin==0) from 411 * read-write, old segment table entries (origin!=0) 412 * HW-bits: R read-only, I invalid 413 * SW-bits: y young, d dirty, r read, w write 414 */ 415 416 /* Page status table bits for virtualization */ 417 #define PGSTE_ACC_BITS 0xf000000000000000UL 418 #define PGSTE_FP_BIT 0x0800000000000000UL 419 #define PGSTE_PCL_BIT 0x0080000000000000UL 420 #define PGSTE_HR_BIT 0x0040000000000000UL 421 #define PGSTE_HC_BIT 0x0020000000000000UL 422 #define PGSTE_GR_BIT 0x0004000000000000UL 423 #define PGSTE_GC_BIT 0x0002000000000000UL 424 #define PGSTE_ST2_MASK 0x0000ffff00000000UL 425 #define PGSTE_UC_BIT 0x0000000000008000UL /* user dirty (migration) */ 426 #define PGSTE_IN_BIT 0x0000000000004000UL /* IPTE notify bit */ 427 #define PGSTE_VSIE_BIT 0x0000000000002000UL /* ref'd in a shadow table */ 428 429 /* Guest Page State used for virtualization */ 430 #define _PGSTE_GPS_ZERO 0x0000000080000000UL 431 #define _PGSTE_GPS_NODAT 0x0000000040000000UL 432 #define _PGSTE_GPS_USAGE_MASK 0x0000000003000000UL 433 #define _PGSTE_GPS_USAGE_STABLE 0x0000000000000000UL 434 #define _PGSTE_GPS_USAGE_UNUSED 0x0000000001000000UL 435 #define _PGSTE_GPS_USAGE_POT_VOLATILE 0x0000000002000000UL 436 #define _PGSTE_GPS_USAGE_VOLATILE _PGSTE_GPS_USAGE_MASK 437 438 /* 439 * A user page table pointer has the space-switch-event bit, the 440 * private-space-control bit and the storage-alteration-event-control 441 * bit set. A kernel page table pointer doesn't need them. 442 */ 443 #define _ASCE_USER_BITS (_ASCE_SPACE_SWITCH | _ASCE_PRIVATE_SPACE | \ 444 _ASCE_ALT_EVENT) 445 446 /* 447 * Page protection definitions. 448 */ 449 #define __PAGE_NONE (_PAGE_PRESENT | _PAGE_INVALID | _PAGE_PROTECT) 450 #define __PAGE_RO (_PAGE_PRESENT | _PAGE_READ | \ 451 _PAGE_NOEXEC | _PAGE_INVALID | _PAGE_PROTECT) 452 #define __PAGE_RX (_PAGE_PRESENT | _PAGE_READ | \ 453 _PAGE_INVALID | _PAGE_PROTECT) 454 #define __PAGE_RW (_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \ 455 _PAGE_NOEXEC | _PAGE_INVALID | _PAGE_PROTECT) 456 #define __PAGE_RWX (_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \ 457 _PAGE_INVALID | _PAGE_PROTECT) 458 #define __PAGE_SHARED (_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \ 459 _PAGE_YOUNG | _PAGE_DIRTY | _PAGE_NOEXEC) 460 #define __PAGE_KERNEL (_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \ 461 _PAGE_YOUNG | _PAGE_DIRTY | _PAGE_NOEXEC) 462 #define __PAGE_KERNEL_RO (_PAGE_PRESENT | _PAGE_READ | _PAGE_YOUNG | \ 463 _PAGE_PROTECT | _PAGE_NOEXEC) 464 465 extern unsigned long page_noexec_mask; 466 467 #define __pgprot_page_mask(x) __pgprot((x) & page_noexec_mask) 468 469 #define PAGE_NONE __pgprot_page_mask(__PAGE_NONE) 470 #define PAGE_RO __pgprot_page_mask(__PAGE_RO) 471 #define PAGE_RX __pgprot_page_mask(__PAGE_RX) 472 #define PAGE_RW __pgprot_page_mask(__PAGE_RW) 473 #define PAGE_RWX __pgprot_page_mask(__PAGE_RWX) 474 #define PAGE_SHARED __pgprot_page_mask(__PAGE_SHARED) 475 #define PAGE_KERNEL __pgprot_page_mask(__PAGE_KERNEL) 476 #define PAGE_KERNEL_RO __pgprot_page_mask(__PAGE_KERNEL_RO) 477 478 /* 479 * Segment entry (large page) protection definitions. 480 */ 481 #define __SEGMENT_NONE (_SEGMENT_ENTRY_PRESENT | \ 482 _SEGMENT_ENTRY_INVALID | \ 483 _SEGMENT_ENTRY_PROTECT) 484 #define __SEGMENT_RO (_SEGMENT_ENTRY_PRESENT | \ 485 _SEGMENT_ENTRY_PROTECT | \ 486 _SEGMENT_ENTRY_READ | \ 487 _SEGMENT_ENTRY_NOEXEC) 488 #define __SEGMENT_RX (_SEGMENT_ENTRY_PRESENT | \ 489 _SEGMENT_ENTRY_PROTECT | \ 490 _SEGMENT_ENTRY_READ) 491 #define __SEGMENT_RW (_SEGMENT_ENTRY_PRESENT | \ 492 _SEGMENT_ENTRY_READ | \ 493 _SEGMENT_ENTRY_WRITE | \ 494 _SEGMENT_ENTRY_NOEXEC) 495 #define __SEGMENT_RWX (_SEGMENT_ENTRY_PRESENT | \ 496 _SEGMENT_ENTRY_READ | \ 497 _SEGMENT_ENTRY_WRITE) 498 #define __SEGMENT_KERNEL (_SEGMENT_ENTRY | \ 499 _SEGMENT_ENTRY_LARGE | \ 500 _SEGMENT_ENTRY_READ | \ 501 _SEGMENT_ENTRY_WRITE | \ 502 _SEGMENT_ENTRY_YOUNG | \ 503 _SEGMENT_ENTRY_DIRTY | \ 504 _SEGMENT_ENTRY_NOEXEC) 505 #define __SEGMENT_KERNEL_RO (_SEGMENT_ENTRY | \ 506 _SEGMENT_ENTRY_LARGE | \ 507 _SEGMENT_ENTRY_READ | \ 508 _SEGMENT_ENTRY_YOUNG | \ 509 _SEGMENT_ENTRY_PROTECT | \ 510 _SEGMENT_ENTRY_NOEXEC) 511 512 extern unsigned long segment_noexec_mask; 513 514 #define __pgprot_segment_mask(x) __pgprot((x) & segment_noexec_mask) 515 516 #define SEGMENT_NONE __pgprot_segment_mask(__SEGMENT_NONE) 517 #define SEGMENT_RO __pgprot_segment_mask(__SEGMENT_RO) 518 #define SEGMENT_RX __pgprot_segment_mask(__SEGMENT_RX) 519 #define SEGMENT_RW __pgprot_segment_mask(__SEGMENT_RW) 520 #define SEGMENT_RWX __pgprot_segment_mask(__SEGMENT_RWX) 521 #define SEGMENT_KERNEL __pgprot_segment_mask(__SEGMENT_KERNEL) 522 #define SEGMENT_KERNEL_RO __pgprot_segment_mask(__SEGMENT_KERNEL_RO) 523 524 /* 525 * Region3 entry (large page) protection definitions. 526 */ 527 528 #define __REGION3_KERNEL (_REGION_ENTRY_TYPE_R3 | \ 529 _REGION3_ENTRY_PRESENT | \ 530 _REGION3_ENTRY_LARGE | \ 531 _REGION3_ENTRY_READ | \ 532 _REGION3_ENTRY_WRITE | \ 533 _REGION3_ENTRY_YOUNG | \ 534 _REGION3_ENTRY_DIRTY | \ 535 _REGION_ENTRY_NOEXEC) 536 #define __REGION3_KERNEL_RO (_REGION_ENTRY_TYPE_R3 | \ 537 _REGION3_ENTRY_PRESENT | \ 538 _REGION3_ENTRY_LARGE | \ 539 _REGION3_ENTRY_READ | \ 540 _REGION3_ENTRY_YOUNG | \ 541 _REGION_ENTRY_PROTECT | \ 542 _REGION_ENTRY_NOEXEC) 543 544 extern unsigned long region_noexec_mask; 545 546 #define __pgprot_region_mask(x) __pgprot((x) & region_noexec_mask) 547 548 #define REGION3_KERNEL __pgprot_region_mask(__REGION3_KERNEL) 549 #define REGION3_KERNEL_RO __pgprot_region_mask(__REGION3_KERNEL_RO) 550 551 static inline bool mm_p4d_folded(struct mm_struct *mm) 552 { 553 return mm->context.asce_limit <= _REGION1_SIZE; 554 } 555 #define mm_p4d_folded(mm) mm_p4d_folded(mm) 556 557 static inline bool mm_pud_folded(struct mm_struct *mm) 558 { 559 return mm->context.asce_limit <= _REGION2_SIZE; 560 } 561 #define mm_pud_folded(mm) mm_pud_folded(mm) 562 563 static inline bool mm_pmd_folded(struct mm_struct *mm) 564 { 565 return mm->context.asce_limit <= _REGION3_SIZE; 566 } 567 #define mm_pmd_folded(mm) mm_pmd_folded(mm) 568 569 static inline int mm_has_pgste(struct mm_struct *mm) 570 { 571 #ifdef CONFIG_PGSTE 572 if (unlikely(mm->context.has_pgste)) 573 return 1; 574 #endif 575 return 0; 576 } 577 578 static inline int mm_is_protected(struct mm_struct *mm) 579 { 580 #ifdef CONFIG_PGSTE 581 if (unlikely(atomic_read(&mm->context.protected_count))) 582 return 1; 583 #endif 584 return 0; 585 } 586 587 static inline pgste_t clear_pgste_bit(pgste_t pgste, unsigned long mask) 588 { 589 return __pgste(pgste_val(pgste) & ~mask); 590 } 591 592 static inline pgste_t set_pgste_bit(pgste_t pgste, unsigned long mask) 593 { 594 return __pgste(pgste_val(pgste) | mask); 595 } 596 597 static inline pte_t clear_pte_bit(pte_t pte, pgprot_t prot) 598 { 599 return __pte(pte_val(pte) & ~pgprot_val(prot)); 600 } 601 602 static inline pte_t set_pte_bit(pte_t pte, pgprot_t prot) 603 { 604 return __pte(pte_val(pte) | pgprot_val(prot)); 605 } 606 607 static inline pmd_t clear_pmd_bit(pmd_t pmd, pgprot_t prot) 608 { 609 return __pmd(pmd_val(pmd) & ~pgprot_val(prot)); 610 } 611 612 static inline pmd_t set_pmd_bit(pmd_t pmd, pgprot_t prot) 613 { 614 return __pmd(pmd_val(pmd) | pgprot_val(prot)); 615 } 616 617 static inline pud_t clear_pud_bit(pud_t pud, pgprot_t prot) 618 { 619 return __pud(pud_val(pud) & ~pgprot_val(prot)); 620 } 621 622 static inline pud_t set_pud_bit(pud_t pud, pgprot_t prot) 623 { 624 return __pud(pud_val(pud) | pgprot_val(prot)); 625 } 626 627 /* 628 * As soon as the guest uses storage keys or enables PV, we deduplicate all 629 * mapped shared zeropages and prevent new shared zeropages from getting 630 * mapped. 631 */ 632 #define mm_forbids_zeropage mm_forbids_zeropage 633 static inline int mm_forbids_zeropage(struct mm_struct *mm) 634 { 635 #ifdef CONFIG_PGSTE 636 if (!mm->context.allow_cow_sharing) 637 return 1; 638 #endif 639 return 0; 640 } 641 642 static inline int mm_uses_skeys(struct mm_struct *mm) 643 { 644 #ifdef CONFIG_PGSTE 645 if (mm->context.uses_skeys) 646 return 1; 647 #endif 648 return 0; 649 } 650 651 static inline void csp(unsigned int *ptr, unsigned int old, unsigned int new) 652 { 653 union register_pair r1 = { .even = old, .odd = new, }; 654 unsigned long address = (unsigned long)ptr | 1; 655 656 asm volatile( 657 " csp %[r1],%[address]" 658 : [r1] "+&d" (r1.pair), "+m" (*ptr) 659 : [address] "d" (address) 660 : "cc"); 661 } 662 663 /** 664 * cspg() - Compare and Swap and Purge (CSPG) 665 * @ptr: Pointer to the value to be exchanged 666 * @old: The expected old value 667 * @new: The new value 668 * 669 * Return: True if compare and swap was successful, otherwise false. 670 */ 671 static inline bool cspg(unsigned long *ptr, unsigned long old, unsigned long new) 672 { 673 union register_pair r1 = { .even = old, .odd = new, }; 674 unsigned long address = (unsigned long)ptr | 1; 675 676 asm volatile( 677 " cspg %[r1],%[address]" 678 : [r1] "+&d" (r1.pair), "+m" (*ptr) 679 : [address] "d" (address) 680 : "cc"); 681 return old == r1.even; 682 } 683 684 #define CRDTE_DTT_PAGE 0x00UL 685 #define CRDTE_DTT_SEGMENT 0x10UL 686 #define CRDTE_DTT_REGION3 0x14UL 687 #define CRDTE_DTT_REGION2 0x18UL 688 #define CRDTE_DTT_REGION1 0x1cUL 689 690 /** 691 * crdte() - Compare and Replace DAT Table Entry 692 * @old: The expected old value 693 * @new: The new value 694 * @table: Pointer to the value to be exchanged 695 * @dtt: Table type of the table to be exchanged 696 * @address: The address mapped by the entry to be replaced 697 * @asce: The ASCE of this entry 698 * 699 * Return: True if compare and replace was successful, otherwise false. 700 */ 701 static inline bool crdte(unsigned long old, unsigned long new, 702 unsigned long *table, unsigned long dtt, 703 unsigned long address, unsigned long asce) 704 { 705 union register_pair r1 = { .even = old, .odd = new, }; 706 union register_pair r2 = { .even = __pa(table) | dtt, .odd = address, }; 707 708 asm volatile(".insn rrf,0xb98f0000,%[r1],%[r2],%[asce],0" 709 : [r1] "+&d" (r1.pair) 710 : [r2] "d" (r2.pair), [asce] "a" (asce) 711 : "memory", "cc"); 712 return old == r1.even; 713 } 714 715 /* 716 * pgd/p4d/pud/pmd/pte query functions 717 */ 718 static inline int pgd_folded(pgd_t pgd) 719 { 720 return (pgd_val(pgd) & _REGION_ENTRY_TYPE_MASK) < _REGION_ENTRY_TYPE_R1; 721 } 722 723 static inline int pgd_present(pgd_t pgd) 724 { 725 if (pgd_folded(pgd)) 726 return 1; 727 return (pgd_val(pgd) & _REGION_ENTRY_ORIGIN) != 0UL; 728 } 729 730 static inline int pgd_none(pgd_t pgd) 731 { 732 if (pgd_folded(pgd)) 733 return 0; 734 return (pgd_val(pgd) & _REGION_ENTRY_INVALID) != 0UL; 735 } 736 737 static inline int pgd_bad(pgd_t pgd) 738 { 739 if ((pgd_val(pgd) & _REGION_ENTRY_TYPE_MASK) < _REGION_ENTRY_TYPE_R1) 740 return 0; 741 return (pgd_val(pgd) & ~_REGION_ENTRY_BITS) != 0; 742 } 743 744 static inline unsigned long pgd_pfn(pgd_t pgd) 745 { 746 unsigned long origin_mask; 747 748 origin_mask = _REGION_ENTRY_ORIGIN; 749 return (pgd_val(pgd) & origin_mask) >> PAGE_SHIFT; 750 } 751 752 static inline int p4d_folded(p4d_t p4d) 753 { 754 return (p4d_val(p4d) & _REGION_ENTRY_TYPE_MASK) < _REGION_ENTRY_TYPE_R2; 755 } 756 757 static inline int p4d_present(p4d_t p4d) 758 { 759 if (p4d_folded(p4d)) 760 return 1; 761 return (p4d_val(p4d) & _REGION_ENTRY_ORIGIN) != 0UL; 762 } 763 764 static inline int p4d_none(p4d_t p4d) 765 { 766 if (p4d_folded(p4d)) 767 return 0; 768 return p4d_val(p4d) == _REGION2_ENTRY_EMPTY; 769 } 770 771 static inline unsigned long p4d_pfn(p4d_t p4d) 772 { 773 unsigned long origin_mask; 774 775 origin_mask = _REGION_ENTRY_ORIGIN; 776 return (p4d_val(p4d) & origin_mask) >> PAGE_SHIFT; 777 } 778 779 static inline int pud_folded(pud_t pud) 780 { 781 return (pud_val(pud) & _REGION_ENTRY_TYPE_MASK) < _REGION_ENTRY_TYPE_R3; 782 } 783 784 static inline int pud_present(pud_t pud) 785 { 786 if (pud_folded(pud)) 787 return 1; 788 return (pud_val(pud) & _REGION3_ENTRY_PRESENT) != 0; 789 } 790 791 static inline int pud_none(pud_t pud) 792 { 793 if (pud_folded(pud)) 794 return 0; 795 return pud_val(pud) == _REGION3_ENTRY_EMPTY; 796 } 797 798 #define pud_leaf pud_leaf 799 static inline bool pud_leaf(pud_t pud) 800 { 801 if ((pud_val(pud) & _REGION_ENTRY_TYPE_MASK) != _REGION_ENTRY_TYPE_R3) 802 return 0; 803 return (pud_present(pud) && (pud_val(pud) & _REGION3_ENTRY_LARGE) != 0); 804 } 805 806 static inline int pmd_present(pmd_t pmd) 807 { 808 return (pmd_val(pmd) & _SEGMENT_ENTRY_PRESENT) != 0; 809 } 810 811 #define pmd_leaf pmd_leaf 812 static inline bool pmd_leaf(pmd_t pmd) 813 { 814 return (pmd_present(pmd) && (pmd_val(pmd) & _SEGMENT_ENTRY_LARGE) != 0); 815 } 816 817 static inline int pmd_bad(pmd_t pmd) 818 { 819 if ((pmd_val(pmd) & _SEGMENT_ENTRY_TYPE_MASK) > 0 || pmd_leaf(pmd)) 820 return 1; 821 return (pmd_val(pmd) & ~_SEGMENT_ENTRY_BITS) != 0; 822 } 823 824 static inline int pud_bad(pud_t pud) 825 { 826 unsigned long type = pud_val(pud) & _REGION_ENTRY_TYPE_MASK; 827 828 if (type > _REGION_ENTRY_TYPE_R3 || pud_leaf(pud)) 829 return 1; 830 if (type < _REGION_ENTRY_TYPE_R3) 831 return 0; 832 return (pud_val(pud) & ~_REGION_ENTRY_BITS) != 0; 833 } 834 835 static inline int p4d_bad(p4d_t p4d) 836 { 837 unsigned long type = p4d_val(p4d) & _REGION_ENTRY_TYPE_MASK; 838 839 if (type > _REGION_ENTRY_TYPE_R2) 840 return 1; 841 if (type < _REGION_ENTRY_TYPE_R2) 842 return 0; 843 return (p4d_val(p4d) & ~_REGION_ENTRY_BITS) != 0; 844 } 845 846 static inline int pmd_none(pmd_t pmd) 847 { 848 return pmd_val(pmd) == _SEGMENT_ENTRY_EMPTY; 849 } 850 851 #define pmd_write pmd_write 852 static inline int pmd_write(pmd_t pmd) 853 { 854 return (pmd_val(pmd) & _SEGMENT_ENTRY_WRITE) != 0; 855 } 856 857 #define pud_write pud_write 858 static inline int pud_write(pud_t pud) 859 { 860 return (pud_val(pud) & _REGION3_ENTRY_WRITE) != 0; 861 } 862 863 #define pmd_dirty pmd_dirty 864 static inline int pmd_dirty(pmd_t pmd) 865 { 866 return (pmd_val(pmd) & _SEGMENT_ENTRY_DIRTY) != 0; 867 } 868 869 #define pmd_young pmd_young 870 static inline int pmd_young(pmd_t pmd) 871 { 872 return (pmd_val(pmd) & _SEGMENT_ENTRY_YOUNG) != 0; 873 } 874 875 static inline int pte_present(pte_t pte) 876 { 877 /* Bit pattern: (pte & 0x001) == 0x001 */ 878 return (pte_val(pte) & _PAGE_PRESENT) != 0; 879 } 880 881 static inline int pte_none(pte_t pte) 882 { 883 /* Bit pattern: pte == 0x400 */ 884 return pte_val(pte) == _PAGE_INVALID; 885 } 886 887 static inline int pte_swap(pte_t pte) 888 { 889 /* Bit pattern: (pte & 0x201) == 0x200 */ 890 return (pte_val(pte) & (_PAGE_PROTECT | _PAGE_PRESENT)) 891 == _PAGE_PROTECT; 892 } 893 894 static inline int pte_special(pte_t pte) 895 { 896 return (pte_val(pte) & _PAGE_SPECIAL); 897 } 898 899 #define __HAVE_ARCH_PTE_SAME 900 static inline int pte_same(pte_t a, pte_t b) 901 { 902 return pte_val(a) == pte_val(b); 903 } 904 905 #ifdef CONFIG_NUMA_BALANCING 906 static inline int pte_protnone(pte_t pte) 907 { 908 return pte_present(pte) && !(pte_val(pte) & _PAGE_READ); 909 } 910 911 static inline int pmd_protnone(pmd_t pmd) 912 { 913 /* pmd_leaf(pmd) implies pmd_present(pmd) */ 914 return pmd_leaf(pmd) && !(pmd_val(pmd) & _SEGMENT_ENTRY_READ); 915 } 916 #endif 917 918 static inline bool pte_swp_exclusive(pte_t pte) 919 { 920 return pte_val(pte) & _PAGE_SWP_EXCLUSIVE; 921 } 922 923 static inline pte_t pte_swp_mkexclusive(pte_t pte) 924 { 925 return set_pte_bit(pte, __pgprot(_PAGE_SWP_EXCLUSIVE)); 926 } 927 928 static inline pte_t pte_swp_clear_exclusive(pte_t pte) 929 { 930 return clear_pte_bit(pte, __pgprot(_PAGE_SWP_EXCLUSIVE)); 931 } 932 933 static inline int pte_soft_dirty(pte_t pte) 934 { 935 return pte_val(pte) & _PAGE_SOFT_DIRTY; 936 } 937 #define pte_swp_soft_dirty pte_soft_dirty 938 939 static inline pte_t pte_mksoft_dirty(pte_t pte) 940 { 941 return set_pte_bit(pte, __pgprot(_PAGE_SOFT_DIRTY)); 942 } 943 #define pte_swp_mksoft_dirty pte_mksoft_dirty 944 945 static inline pte_t pte_clear_soft_dirty(pte_t pte) 946 { 947 return clear_pte_bit(pte, __pgprot(_PAGE_SOFT_DIRTY)); 948 } 949 #define pte_swp_clear_soft_dirty pte_clear_soft_dirty 950 951 static inline int pmd_soft_dirty(pmd_t pmd) 952 { 953 return pmd_val(pmd) & _SEGMENT_ENTRY_SOFT_DIRTY; 954 } 955 956 static inline pmd_t pmd_mksoft_dirty(pmd_t pmd) 957 { 958 return set_pmd_bit(pmd, __pgprot(_SEGMENT_ENTRY_SOFT_DIRTY)); 959 } 960 961 static inline pmd_t pmd_clear_soft_dirty(pmd_t pmd) 962 { 963 return clear_pmd_bit(pmd, __pgprot(_SEGMENT_ENTRY_SOFT_DIRTY)); 964 } 965 966 /* 967 * query functions pte_write/pte_dirty/pte_young only work if 968 * pte_present() is true. Undefined behaviour if not.. 969 */ 970 static inline int pte_write(pte_t pte) 971 { 972 return (pte_val(pte) & _PAGE_WRITE) != 0; 973 } 974 975 static inline int pte_dirty(pte_t pte) 976 { 977 return (pte_val(pte) & _PAGE_DIRTY) != 0; 978 } 979 980 static inline int pte_young(pte_t pte) 981 { 982 return (pte_val(pte) & _PAGE_YOUNG) != 0; 983 } 984 985 #define __HAVE_ARCH_PTE_UNUSED 986 static inline int pte_unused(pte_t pte) 987 { 988 return pte_val(pte) & _PAGE_UNUSED; 989 } 990 991 /* 992 * Extract the pgprot value from the given pte while at the same time making it 993 * usable for kernel address space mappings where fault driven dirty and 994 * young/old accounting is not supported, i.e _PAGE_PROTECT and _PAGE_INVALID 995 * must not be set. 996 */ 997 #define pte_pgprot pte_pgprot 998 static inline pgprot_t pte_pgprot(pte_t pte) 999 { 1000 unsigned long pte_flags = pte_val(pte) & _PAGE_CHG_MASK; 1001 1002 if (pte_write(pte)) 1003 pte_flags |= pgprot_val(PAGE_KERNEL); 1004 else 1005 pte_flags |= pgprot_val(PAGE_KERNEL_RO); 1006 pte_flags |= pte_val(pte) & mio_wb_bit_mask; 1007 1008 return __pgprot(pte_flags); 1009 } 1010 1011 /* 1012 * pgd/pmd/pte modification functions 1013 */ 1014 1015 static inline void set_pgd(pgd_t *pgdp, pgd_t pgd) 1016 { 1017 WRITE_ONCE(*pgdp, pgd); 1018 } 1019 1020 static inline void set_p4d(p4d_t *p4dp, p4d_t p4d) 1021 { 1022 WRITE_ONCE(*p4dp, p4d); 1023 } 1024 1025 static inline void set_pud(pud_t *pudp, pud_t pud) 1026 { 1027 WRITE_ONCE(*pudp, pud); 1028 } 1029 1030 static inline void set_pmd(pmd_t *pmdp, pmd_t pmd) 1031 { 1032 WRITE_ONCE(*pmdp, pmd); 1033 } 1034 1035 static inline void set_pte(pte_t *ptep, pte_t pte) 1036 { 1037 WRITE_ONCE(*ptep, pte); 1038 } 1039 1040 static inline void pgd_clear(pgd_t *pgd) 1041 { 1042 if ((pgd_val(*pgd) & _REGION_ENTRY_TYPE_MASK) == _REGION_ENTRY_TYPE_R1) 1043 set_pgd(pgd, __pgd(_REGION1_ENTRY_EMPTY)); 1044 } 1045 1046 static inline void p4d_clear(p4d_t *p4d) 1047 { 1048 if ((p4d_val(*p4d) & _REGION_ENTRY_TYPE_MASK) == _REGION_ENTRY_TYPE_R2) 1049 set_p4d(p4d, __p4d(_REGION2_ENTRY_EMPTY)); 1050 } 1051 1052 static inline void pud_clear(pud_t *pud) 1053 { 1054 if ((pud_val(*pud) & _REGION_ENTRY_TYPE_MASK) == _REGION_ENTRY_TYPE_R3) 1055 set_pud(pud, __pud(_REGION3_ENTRY_EMPTY)); 1056 } 1057 1058 static inline void pmd_clear(pmd_t *pmdp) 1059 { 1060 set_pmd(pmdp, __pmd(_SEGMENT_ENTRY_EMPTY)); 1061 } 1062 1063 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep) 1064 { 1065 set_pte(ptep, __pte(_PAGE_INVALID)); 1066 } 1067 1068 /* 1069 * The following pte modification functions only work if 1070 * pte_present() is true. Undefined behaviour if not.. 1071 */ 1072 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) 1073 { 1074 pte = clear_pte_bit(pte, __pgprot(~_PAGE_CHG_MASK)); 1075 pte = set_pte_bit(pte, newprot); 1076 /* 1077 * newprot for PAGE_NONE, PAGE_RO, PAGE_RX, PAGE_RW and PAGE_RWX 1078 * has the invalid bit set, clear it again for readable, young pages 1079 */ 1080 if ((pte_val(pte) & _PAGE_YOUNG) && (pte_val(pte) & _PAGE_READ)) 1081 pte = clear_pte_bit(pte, __pgprot(_PAGE_INVALID)); 1082 /* 1083 * newprot for PAGE_RO, PAGE_RX, PAGE_RW and PAGE_RWX has the page 1084 * protection bit set, clear it again for writable, dirty pages 1085 */ 1086 if ((pte_val(pte) & _PAGE_DIRTY) && (pte_val(pte) & _PAGE_WRITE)) 1087 pte = clear_pte_bit(pte, __pgprot(_PAGE_PROTECT)); 1088 return pte; 1089 } 1090 1091 static inline pte_t pte_wrprotect(pte_t pte) 1092 { 1093 pte = clear_pte_bit(pte, __pgprot(_PAGE_WRITE)); 1094 return set_pte_bit(pte, __pgprot(_PAGE_PROTECT)); 1095 } 1096 1097 static inline pte_t pte_mkwrite_novma(pte_t pte) 1098 { 1099 pte = set_pte_bit(pte, __pgprot(_PAGE_WRITE)); 1100 if (pte_val(pte) & _PAGE_DIRTY) 1101 pte = clear_pte_bit(pte, __pgprot(_PAGE_PROTECT)); 1102 return pte; 1103 } 1104 1105 static inline pte_t pte_mkclean(pte_t pte) 1106 { 1107 pte = clear_pte_bit(pte, __pgprot(_PAGE_DIRTY)); 1108 return set_pte_bit(pte, __pgprot(_PAGE_PROTECT)); 1109 } 1110 1111 static inline pte_t pte_mkdirty(pte_t pte) 1112 { 1113 pte = set_pte_bit(pte, __pgprot(_PAGE_DIRTY | _PAGE_SOFT_DIRTY)); 1114 if (pte_val(pte) & _PAGE_WRITE) 1115 pte = clear_pte_bit(pte, __pgprot(_PAGE_PROTECT)); 1116 return pte; 1117 } 1118 1119 static inline pte_t pte_mkold(pte_t pte) 1120 { 1121 pte = clear_pte_bit(pte, __pgprot(_PAGE_YOUNG)); 1122 return set_pte_bit(pte, __pgprot(_PAGE_INVALID)); 1123 } 1124 1125 static inline pte_t pte_mkyoung(pte_t pte) 1126 { 1127 pte = set_pte_bit(pte, __pgprot(_PAGE_YOUNG)); 1128 if (pte_val(pte) & _PAGE_READ) 1129 pte = clear_pte_bit(pte, __pgprot(_PAGE_INVALID)); 1130 return pte; 1131 } 1132 1133 static inline pte_t pte_mkspecial(pte_t pte) 1134 { 1135 return set_pte_bit(pte, __pgprot(_PAGE_SPECIAL)); 1136 } 1137 1138 #ifdef CONFIG_HUGETLB_PAGE 1139 static inline pte_t pte_mkhuge(pte_t pte) 1140 { 1141 return set_pte_bit(pte, __pgprot(_PAGE_LARGE)); 1142 } 1143 #endif 1144 1145 #define IPTE_GLOBAL 0 1146 #define IPTE_LOCAL 1 1147 1148 #define IPTE_NODAT 0x400 1149 #define IPTE_GUEST_ASCE 0x800 1150 1151 static __always_inline void __ptep_rdp(unsigned long addr, pte_t *ptep, 1152 unsigned long opt, unsigned long asce, 1153 int local) 1154 { 1155 unsigned long pto; 1156 1157 pto = __pa(ptep) & ~(PTRS_PER_PTE * sizeof(pte_t) - 1); 1158 asm volatile(".insn rrf,0xb98b0000,%[r1],%[r2],%[asce],%[m4]" 1159 : "+m" (*ptep) 1160 : [r1] "a" (pto), [r2] "a" ((addr & PAGE_MASK) | opt), 1161 [asce] "a" (asce), [m4] "i" (local)); 1162 } 1163 1164 static __always_inline void __ptep_ipte(unsigned long address, pte_t *ptep, 1165 unsigned long opt, unsigned long asce, 1166 int local) 1167 { 1168 unsigned long pto = __pa(ptep); 1169 1170 if (__builtin_constant_p(opt) && opt == 0) { 1171 /* Invalidation + TLB flush for the pte */ 1172 asm volatile( 1173 " ipte %[r1],%[r2],0,%[m4]" 1174 : "+m" (*ptep) : [r1] "a" (pto), [r2] "a" (address), 1175 [m4] "i" (local)); 1176 return; 1177 } 1178 1179 /* Invalidate ptes with options + TLB flush of the ptes */ 1180 opt = opt | (asce & _ASCE_ORIGIN); 1181 asm volatile( 1182 " ipte %[r1],%[r2],%[r3],%[m4]" 1183 : [r2] "+a" (address), [r3] "+a" (opt) 1184 : [r1] "a" (pto), [m4] "i" (local) : "memory"); 1185 } 1186 1187 static __always_inline void __ptep_ipte_range(unsigned long address, int nr, 1188 pte_t *ptep, int local) 1189 { 1190 unsigned long pto = __pa(ptep); 1191 1192 /* Invalidate a range of ptes + TLB flush of the ptes */ 1193 do { 1194 asm volatile( 1195 " ipte %[r1],%[r2],%[r3],%[m4]" 1196 : [r2] "+a" (address), [r3] "+a" (nr) 1197 : [r1] "a" (pto), [m4] "i" (local) : "memory"); 1198 } while (nr != 255); 1199 } 1200 1201 /* 1202 * This is hard to understand. ptep_get_and_clear and ptep_clear_flush 1203 * both clear the TLB for the unmapped pte. The reason is that 1204 * ptep_get_and_clear is used in common code (e.g. change_pte_range) 1205 * to modify an active pte. The sequence is 1206 * 1) ptep_get_and_clear 1207 * 2) set_pte_at 1208 * 3) flush_tlb_range 1209 * On s390 the tlb needs to get flushed with the modification of the pte 1210 * if the pte is active. The only way how this can be implemented is to 1211 * have ptep_get_and_clear do the tlb flush. In exchange flush_tlb_range 1212 * is a nop. 1213 */ 1214 pte_t ptep_xchg_direct(struct mm_struct *, unsigned long, pte_t *, pte_t); 1215 pte_t ptep_xchg_lazy(struct mm_struct *, unsigned long, pte_t *, pte_t); 1216 1217 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG 1218 static inline int ptep_test_and_clear_young(struct vm_area_struct *vma, 1219 unsigned long addr, pte_t *ptep) 1220 { 1221 pte_t pte = *ptep; 1222 1223 pte = ptep_xchg_direct(vma->vm_mm, addr, ptep, pte_mkold(pte)); 1224 return pte_young(pte); 1225 } 1226 1227 #define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH 1228 static inline int ptep_clear_flush_young(struct vm_area_struct *vma, 1229 unsigned long address, pte_t *ptep) 1230 { 1231 return ptep_test_and_clear_young(vma, address, ptep); 1232 } 1233 1234 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR 1235 static inline pte_t ptep_get_and_clear(struct mm_struct *mm, 1236 unsigned long addr, pte_t *ptep) 1237 { 1238 pte_t res; 1239 1240 res = ptep_xchg_lazy(mm, addr, ptep, __pte(_PAGE_INVALID)); 1241 /* At this point the reference through the mapping is still present */ 1242 if (mm_is_protected(mm) && pte_present(res)) 1243 uv_convert_from_secure_pte(res); 1244 return res; 1245 } 1246 1247 #define __HAVE_ARCH_PTEP_MODIFY_PROT_TRANSACTION 1248 pte_t ptep_modify_prot_start(struct vm_area_struct *, unsigned long, pte_t *); 1249 void ptep_modify_prot_commit(struct vm_area_struct *, unsigned long, 1250 pte_t *, pte_t, pte_t); 1251 1252 #define __HAVE_ARCH_PTEP_CLEAR_FLUSH 1253 static inline pte_t ptep_clear_flush(struct vm_area_struct *vma, 1254 unsigned long addr, pte_t *ptep) 1255 { 1256 pte_t res; 1257 1258 res = ptep_xchg_direct(vma->vm_mm, addr, ptep, __pte(_PAGE_INVALID)); 1259 /* At this point the reference through the mapping is still present */ 1260 if (mm_is_protected(vma->vm_mm) && pte_present(res)) 1261 uv_convert_from_secure_pte(res); 1262 return res; 1263 } 1264 1265 /* 1266 * The batched pte unmap code uses ptep_get_and_clear_full to clear the 1267 * ptes. Here an optimization is possible. tlb_gather_mmu flushes all 1268 * tlbs of an mm if it can guarantee that the ptes of the mm_struct 1269 * cannot be accessed while the batched unmap is running. In this case 1270 * full==1 and a simple pte_clear is enough. See tlb.h. 1271 */ 1272 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL 1273 static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm, 1274 unsigned long addr, 1275 pte_t *ptep, int full) 1276 { 1277 pte_t res; 1278 1279 if (full) { 1280 res = *ptep; 1281 set_pte(ptep, __pte(_PAGE_INVALID)); 1282 } else { 1283 res = ptep_xchg_lazy(mm, addr, ptep, __pte(_PAGE_INVALID)); 1284 } 1285 /* Nothing to do */ 1286 if (!mm_is_protected(mm) || !pte_present(res)) 1287 return res; 1288 /* 1289 * At this point the reference through the mapping is still present. 1290 * The notifier should have destroyed all protected vCPUs at this 1291 * point, so the destroy should be successful. 1292 */ 1293 if (full && !uv_destroy_pte(res)) 1294 return res; 1295 /* 1296 * If something went wrong and the page could not be destroyed, or 1297 * if this is not a mm teardown, the slower export is used as 1298 * fallback instead. 1299 */ 1300 uv_convert_from_secure_pte(res); 1301 return res; 1302 } 1303 1304 #define __HAVE_ARCH_PTEP_SET_WRPROTECT 1305 static inline void ptep_set_wrprotect(struct mm_struct *mm, 1306 unsigned long addr, pte_t *ptep) 1307 { 1308 pte_t pte = *ptep; 1309 1310 if (pte_write(pte)) 1311 ptep_xchg_lazy(mm, addr, ptep, pte_wrprotect(pte)); 1312 } 1313 1314 /* 1315 * Check if PTEs only differ in _PAGE_PROTECT HW bit, but also allow SW PTE 1316 * bits in the comparison. Those might change e.g. because of dirty and young 1317 * tracking. 1318 */ 1319 static inline int pte_allow_rdp(pte_t old, pte_t new) 1320 { 1321 /* 1322 * Only allow changes from RO to RW 1323 */ 1324 if (!(pte_val(old) & _PAGE_PROTECT) || pte_val(new) & _PAGE_PROTECT) 1325 return 0; 1326 1327 return (pte_val(old) & _PAGE_RDP_MASK) == (pte_val(new) & _PAGE_RDP_MASK); 1328 } 1329 1330 static inline void flush_tlb_fix_spurious_fault(struct vm_area_struct *vma, 1331 unsigned long address, 1332 pte_t *ptep) 1333 { 1334 /* 1335 * RDP might not have propagated the PTE protection reset to all CPUs, 1336 * so there could be spurious TLB protection faults. 1337 * NOTE: This will also be called when a racing pagetable update on 1338 * another thread already installed the correct PTE. Both cases cannot 1339 * really be distinguished. 1340 * Therefore, only do the local TLB flush when RDP can be used, and the 1341 * PTE does not have _PAGE_PROTECT set, to avoid unnecessary overhead. 1342 * A local RDP can be used to do the flush. 1343 */ 1344 if (cpu_has_rdp() && !(pte_val(*ptep) & _PAGE_PROTECT)) 1345 __ptep_rdp(address, ptep, 0, 0, 1); 1346 } 1347 #define flush_tlb_fix_spurious_fault flush_tlb_fix_spurious_fault 1348 1349 void ptep_reset_dat_prot(struct mm_struct *mm, unsigned long addr, pte_t *ptep, 1350 pte_t new); 1351 1352 #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS 1353 static inline int ptep_set_access_flags(struct vm_area_struct *vma, 1354 unsigned long addr, pte_t *ptep, 1355 pte_t entry, int dirty) 1356 { 1357 if (pte_same(*ptep, entry)) 1358 return 0; 1359 if (cpu_has_rdp() && !mm_has_pgste(vma->vm_mm) && pte_allow_rdp(*ptep, entry)) 1360 ptep_reset_dat_prot(vma->vm_mm, addr, ptep, entry); 1361 else 1362 ptep_xchg_direct(vma->vm_mm, addr, ptep, entry); 1363 return 1; 1364 } 1365 1366 /* 1367 * Additional functions to handle KVM guest page tables 1368 */ 1369 void ptep_set_pte_at(struct mm_struct *mm, unsigned long addr, 1370 pte_t *ptep, pte_t entry); 1371 void ptep_set_notify(struct mm_struct *mm, unsigned long addr, pte_t *ptep); 1372 void ptep_notify(struct mm_struct *mm, unsigned long addr, 1373 pte_t *ptep, unsigned long bits); 1374 int ptep_force_prot(struct mm_struct *mm, unsigned long gaddr, 1375 pte_t *ptep, int prot, unsigned long bit); 1376 void ptep_zap_unused(struct mm_struct *mm, unsigned long addr, 1377 pte_t *ptep , int reset); 1378 void ptep_zap_key(struct mm_struct *mm, unsigned long addr, pte_t *ptep); 1379 int ptep_shadow_pte(struct mm_struct *mm, unsigned long saddr, 1380 pte_t *sptep, pte_t *tptep, pte_t pte); 1381 void ptep_unshadow_pte(struct mm_struct *mm, unsigned long saddr, pte_t *ptep); 1382 1383 bool ptep_test_and_clear_uc(struct mm_struct *mm, unsigned long address, 1384 pte_t *ptep); 1385 int set_guest_storage_key(struct mm_struct *mm, unsigned long addr, 1386 unsigned char key, bool nq); 1387 int cond_set_guest_storage_key(struct mm_struct *mm, unsigned long addr, 1388 unsigned char key, unsigned char *oldkey, 1389 bool nq, bool mr, bool mc); 1390 int reset_guest_reference_bit(struct mm_struct *mm, unsigned long addr); 1391 int get_guest_storage_key(struct mm_struct *mm, unsigned long addr, 1392 unsigned char *key); 1393 1394 int set_pgste_bits(struct mm_struct *mm, unsigned long addr, 1395 unsigned long bits, unsigned long value); 1396 int get_pgste(struct mm_struct *mm, unsigned long hva, unsigned long *pgstep); 1397 int pgste_perform_essa(struct mm_struct *mm, unsigned long hva, int orc, 1398 unsigned long *oldpte, unsigned long *oldpgste); 1399 void gmap_pmdp_csp(struct mm_struct *mm, unsigned long vmaddr); 1400 void gmap_pmdp_invalidate(struct mm_struct *mm, unsigned long vmaddr); 1401 void gmap_pmdp_idte_local(struct mm_struct *mm, unsigned long vmaddr); 1402 void gmap_pmdp_idte_global(struct mm_struct *mm, unsigned long vmaddr); 1403 1404 #define pgprot_writecombine pgprot_writecombine 1405 pgprot_t pgprot_writecombine(pgprot_t prot); 1406 1407 #define PFN_PTE_SHIFT PAGE_SHIFT 1408 1409 /* 1410 * Set multiple PTEs to consecutive pages with a single call. All PTEs 1411 * are within the same folio, PMD and VMA. 1412 */ 1413 static inline void set_ptes(struct mm_struct *mm, unsigned long addr, 1414 pte_t *ptep, pte_t entry, unsigned int nr) 1415 { 1416 if (pte_present(entry)) 1417 entry = clear_pte_bit(entry, __pgprot(_PAGE_UNUSED)); 1418 if (mm_has_pgste(mm)) { 1419 for (;;) { 1420 ptep_set_pte_at(mm, addr, ptep, entry); 1421 if (--nr == 0) 1422 break; 1423 ptep++; 1424 entry = __pte(pte_val(entry) + PAGE_SIZE); 1425 addr += PAGE_SIZE; 1426 } 1427 } else { 1428 for (;;) { 1429 set_pte(ptep, entry); 1430 if (--nr == 0) 1431 break; 1432 ptep++; 1433 entry = __pte(pte_val(entry) + PAGE_SIZE); 1434 } 1435 } 1436 } 1437 #define set_ptes set_ptes 1438 1439 /* 1440 * Conversion functions: convert a page and protection to a page entry, 1441 * and a page entry and page directory to the page they refer to. 1442 */ 1443 static inline pte_t mk_pte_phys(unsigned long physpage, pgprot_t pgprot) 1444 { 1445 pte_t __pte; 1446 1447 __pte = __pte(physpage | pgprot_val(pgprot)); 1448 return pte_mkyoung(__pte); 1449 } 1450 1451 #define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD-1)) 1452 #define p4d_index(address) (((address) >> P4D_SHIFT) & (PTRS_PER_P4D-1)) 1453 #define pud_index(address) (((address) >> PUD_SHIFT) & (PTRS_PER_PUD-1)) 1454 #define pmd_index(address) (((address) >> PMD_SHIFT) & (PTRS_PER_PMD-1)) 1455 1456 #define p4d_deref(pud) ((unsigned long)__va(p4d_val(pud) & _REGION_ENTRY_ORIGIN)) 1457 #define pgd_deref(pgd) ((unsigned long)__va(pgd_val(pgd) & _REGION_ENTRY_ORIGIN)) 1458 1459 static inline unsigned long pmd_deref(pmd_t pmd) 1460 { 1461 unsigned long origin_mask; 1462 1463 origin_mask = _SEGMENT_ENTRY_ORIGIN; 1464 if (pmd_leaf(pmd)) 1465 origin_mask = _SEGMENT_ENTRY_ORIGIN_LARGE; 1466 return (unsigned long)__va(pmd_val(pmd) & origin_mask); 1467 } 1468 1469 static inline unsigned long pmd_pfn(pmd_t pmd) 1470 { 1471 return __pa(pmd_deref(pmd)) >> PAGE_SHIFT; 1472 } 1473 1474 static inline unsigned long pud_deref(pud_t pud) 1475 { 1476 unsigned long origin_mask; 1477 1478 origin_mask = _REGION_ENTRY_ORIGIN; 1479 if (pud_leaf(pud)) 1480 origin_mask = _REGION3_ENTRY_ORIGIN_LARGE; 1481 return (unsigned long)__va(pud_val(pud) & origin_mask); 1482 } 1483 1484 #define pud_pfn pud_pfn 1485 static inline unsigned long pud_pfn(pud_t pud) 1486 { 1487 return __pa(pud_deref(pud)) >> PAGE_SHIFT; 1488 } 1489 1490 /* 1491 * The pgd_offset function *always* adds the index for the top-level 1492 * region/segment table. This is done to get a sequence like the 1493 * following to work: 1494 * pgdp = pgd_offset(current->mm, addr); 1495 * pgd = READ_ONCE(*pgdp); 1496 * p4dp = p4d_offset(&pgd, addr); 1497 * ... 1498 * The subsequent p4d_offset, pud_offset and pmd_offset functions 1499 * only add an index if they dereferenced the pointer. 1500 */ 1501 static inline pgd_t *pgd_offset_raw(pgd_t *pgd, unsigned long address) 1502 { 1503 unsigned long rste; 1504 unsigned int shift; 1505 1506 /* Get the first entry of the top level table */ 1507 rste = pgd_val(*pgd); 1508 /* Pick up the shift from the table type of the first entry */ 1509 shift = ((rste & _REGION_ENTRY_TYPE_MASK) >> 2) * 11 + 20; 1510 return pgd + ((address >> shift) & (PTRS_PER_PGD - 1)); 1511 } 1512 1513 #define pgd_offset(mm, address) pgd_offset_raw(READ_ONCE((mm)->pgd), address) 1514 1515 static inline p4d_t *p4d_offset_lockless(pgd_t *pgdp, pgd_t pgd, unsigned long address) 1516 { 1517 if ((pgd_val(pgd) & _REGION_ENTRY_TYPE_MASK) >= _REGION_ENTRY_TYPE_R1) 1518 return (p4d_t *) pgd_deref(pgd) + p4d_index(address); 1519 return (p4d_t *) pgdp; 1520 } 1521 #define p4d_offset_lockless p4d_offset_lockless 1522 1523 static inline p4d_t *p4d_offset(pgd_t *pgdp, unsigned long address) 1524 { 1525 return p4d_offset_lockless(pgdp, *pgdp, address); 1526 } 1527 1528 static inline pud_t *pud_offset_lockless(p4d_t *p4dp, p4d_t p4d, unsigned long address) 1529 { 1530 if ((p4d_val(p4d) & _REGION_ENTRY_TYPE_MASK) >= _REGION_ENTRY_TYPE_R2) 1531 return (pud_t *) p4d_deref(p4d) + pud_index(address); 1532 return (pud_t *) p4dp; 1533 } 1534 #define pud_offset_lockless pud_offset_lockless 1535 1536 static inline pud_t *pud_offset(p4d_t *p4dp, unsigned long address) 1537 { 1538 return pud_offset_lockless(p4dp, *p4dp, address); 1539 } 1540 #define pud_offset pud_offset 1541 1542 static inline pmd_t *pmd_offset_lockless(pud_t *pudp, pud_t pud, unsigned long address) 1543 { 1544 if ((pud_val(pud) & _REGION_ENTRY_TYPE_MASK) >= _REGION_ENTRY_TYPE_R3) 1545 return (pmd_t *) pud_deref(pud) + pmd_index(address); 1546 return (pmd_t *) pudp; 1547 } 1548 #define pmd_offset_lockless pmd_offset_lockless 1549 1550 static inline pmd_t *pmd_offset(pud_t *pudp, unsigned long address) 1551 { 1552 return pmd_offset_lockless(pudp, *pudp, address); 1553 } 1554 #define pmd_offset pmd_offset 1555 1556 static inline unsigned long pmd_page_vaddr(pmd_t pmd) 1557 { 1558 return (unsigned long) pmd_deref(pmd); 1559 } 1560 1561 static inline bool gup_fast_permitted(unsigned long start, unsigned long end) 1562 { 1563 return end <= current->mm->context.asce_limit; 1564 } 1565 #define gup_fast_permitted gup_fast_permitted 1566 1567 #define pfn_pte(pfn, pgprot) mk_pte_phys(((pfn) << PAGE_SHIFT), (pgprot)) 1568 #define pte_pfn(x) (pte_val(x) >> PAGE_SHIFT) 1569 #define pte_page(x) pfn_to_page(pte_pfn(x)) 1570 1571 #define pmd_page(pmd) pfn_to_page(pmd_pfn(pmd)) 1572 #define pud_page(pud) pfn_to_page(pud_pfn(pud)) 1573 #define p4d_page(p4d) pfn_to_page(p4d_pfn(p4d)) 1574 #define pgd_page(pgd) pfn_to_page(pgd_pfn(pgd)) 1575 1576 static inline pmd_t pmd_wrprotect(pmd_t pmd) 1577 { 1578 pmd = clear_pmd_bit(pmd, __pgprot(_SEGMENT_ENTRY_WRITE)); 1579 return set_pmd_bit(pmd, __pgprot(_SEGMENT_ENTRY_PROTECT)); 1580 } 1581 1582 static inline pmd_t pmd_mkwrite_novma(pmd_t pmd) 1583 { 1584 pmd = set_pmd_bit(pmd, __pgprot(_SEGMENT_ENTRY_WRITE)); 1585 if (pmd_val(pmd) & _SEGMENT_ENTRY_DIRTY) 1586 pmd = clear_pmd_bit(pmd, __pgprot(_SEGMENT_ENTRY_PROTECT)); 1587 return pmd; 1588 } 1589 1590 static inline pmd_t pmd_mkclean(pmd_t pmd) 1591 { 1592 pmd = clear_pmd_bit(pmd, __pgprot(_SEGMENT_ENTRY_DIRTY)); 1593 return set_pmd_bit(pmd, __pgprot(_SEGMENT_ENTRY_PROTECT)); 1594 } 1595 1596 static inline pmd_t pmd_mkdirty(pmd_t pmd) 1597 { 1598 pmd = set_pmd_bit(pmd, __pgprot(_SEGMENT_ENTRY_DIRTY | _SEGMENT_ENTRY_SOFT_DIRTY)); 1599 if (pmd_val(pmd) & _SEGMENT_ENTRY_WRITE) 1600 pmd = clear_pmd_bit(pmd, __pgprot(_SEGMENT_ENTRY_PROTECT)); 1601 return pmd; 1602 } 1603 1604 static inline pud_t pud_wrprotect(pud_t pud) 1605 { 1606 pud = clear_pud_bit(pud, __pgprot(_REGION3_ENTRY_WRITE)); 1607 return set_pud_bit(pud, __pgprot(_REGION_ENTRY_PROTECT)); 1608 } 1609 1610 static inline pud_t pud_mkwrite(pud_t pud) 1611 { 1612 pud = set_pud_bit(pud, __pgprot(_REGION3_ENTRY_WRITE)); 1613 if (pud_val(pud) & _REGION3_ENTRY_DIRTY) 1614 pud = clear_pud_bit(pud, __pgprot(_REGION_ENTRY_PROTECT)); 1615 return pud; 1616 } 1617 1618 static inline pud_t pud_mkclean(pud_t pud) 1619 { 1620 pud = clear_pud_bit(pud, __pgprot(_REGION3_ENTRY_DIRTY)); 1621 return set_pud_bit(pud, __pgprot(_REGION_ENTRY_PROTECT)); 1622 } 1623 1624 static inline pud_t pud_mkdirty(pud_t pud) 1625 { 1626 pud = set_pud_bit(pud, __pgprot(_REGION3_ENTRY_DIRTY | _REGION3_ENTRY_SOFT_DIRTY)); 1627 if (pud_val(pud) & _REGION3_ENTRY_WRITE) 1628 pud = clear_pud_bit(pud, __pgprot(_REGION_ENTRY_PROTECT)); 1629 return pud; 1630 } 1631 1632 #if defined(CONFIG_TRANSPARENT_HUGEPAGE) || defined(CONFIG_HUGETLB_PAGE) 1633 static inline unsigned long massage_pgprot_pmd(pgprot_t pgprot) 1634 { 1635 /* 1636 * pgprot is PAGE_NONE, PAGE_RO, PAGE_RX, PAGE_RW or PAGE_RWX 1637 * (see __Pxxx / __Sxxx). Convert to segment table entry format. 1638 */ 1639 if (pgprot_val(pgprot) == pgprot_val(PAGE_NONE)) 1640 return pgprot_val(SEGMENT_NONE); 1641 if (pgprot_val(pgprot) == pgprot_val(PAGE_RO)) 1642 return pgprot_val(SEGMENT_RO); 1643 if (pgprot_val(pgprot) == pgprot_val(PAGE_RX)) 1644 return pgprot_val(SEGMENT_RX); 1645 if (pgprot_val(pgprot) == pgprot_val(PAGE_RW)) 1646 return pgprot_val(SEGMENT_RW); 1647 return pgprot_val(SEGMENT_RWX); 1648 } 1649 1650 static inline pmd_t pmd_mkyoung(pmd_t pmd) 1651 { 1652 pmd = set_pmd_bit(pmd, __pgprot(_SEGMENT_ENTRY_YOUNG)); 1653 if (pmd_val(pmd) & _SEGMENT_ENTRY_READ) 1654 pmd = clear_pmd_bit(pmd, __pgprot(_SEGMENT_ENTRY_INVALID)); 1655 return pmd; 1656 } 1657 1658 static inline pmd_t pmd_mkold(pmd_t pmd) 1659 { 1660 pmd = clear_pmd_bit(pmd, __pgprot(_SEGMENT_ENTRY_YOUNG)); 1661 return set_pmd_bit(pmd, __pgprot(_SEGMENT_ENTRY_INVALID)); 1662 } 1663 1664 static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot) 1665 { 1666 unsigned long mask; 1667 1668 mask = _SEGMENT_ENTRY_ORIGIN_LARGE; 1669 mask |= _SEGMENT_ENTRY_DIRTY; 1670 mask |= _SEGMENT_ENTRY_YOUNG; 1671 mask |= _SEGMENT_ENTRY_LARGE; 1672 mask |= _SEGMENT_ENTRY_SOFT_DIRTY; 1673 pmd = __pmd(pmd_val(pmd) & mask); 1674 pmd = set_pmd_bit(pmd, __pgprot(massage_pgprot_pmd(newprot))); 1675 if (!(pmd_val(pmd) & _SEGMENT_ENTRY_DIRTY)) 1676 pmd = set_pmd_bit(pmd, __pgprot(_SEGMENT_ENTRY_PROTECT)); 1677 if (!(pmd_val(pmd) & _SEGMENT_ENTRY_YOUNG)) 1678 pmd = set_pmd_bit(pmd, __pgprot(_SEGMENT_ENTRY_INVALID)); 1679 return pmd; 1680 } 1681 1682 static inline pmd_t mk_pmd_phys(unsigned long physpage, pgprot_t pgprot) 1683 { 1684 return __pmd(physpage + massage_pgprot_pmd(pgprot)); 1685 } 1686 1687 #endif /* CONFIG_TRANSPARENT_HUGEPAGE || CONFIG_HUGETLB_PAGE */ 1688 1689 static inline void __pmdp_csp(pmd_t *pmdp) 1690 { 1691 csp((unsigned int *)pmdp + 1, pmd_val(*pmdp), 1692 pmd_val(*pmdp) | _SEGMENT_ENTRY_INVALID); 1693 } 1694 1695 #define IDTE_GLOBAL 0 1696 #define IDTE_LOCAL 1 1697 1698 #define IDTE_PTOA 0x0800 1699 #define IDTE_NODAT 0x1000 1700 #define IDTE_GUEST_ASCE 0x2000 1701 1702 static __always_inline void __pmdp_idte(unsigned long addr, pmd_t *pmdp, 1703 unsigned long opt, unsigned long asce, 1704 int local) 1705 { 1706 unsigned long sto; 1707 1708 sto = __pa(pmdp) - pmd_index(addr) * sizeof(pmd_t); 1709 if (__builtin_constant_p(opt) && opt == 0) { 1710 /* flush without guest asce */ 1711 asm volatile( 1712 " idte %[r1],0,%[r2],%[m4]" 1713 : "+m" (*pmdp) 1714 : [r1] "a" (sto), [r2] "a" ((addr & HPAGE_MASK)), 1715 [m4] "i" (local) 1716 : "cc" ); 1717 } else { 1718 /* flush with guest asce */ 1719 asm volatile( 1720 " idte %[r1],%[r3],%[r2],%[m4]" 1721 : "+m" (*pmdp) 1722 : [r1] "a" (sto), [r2] "a" ((addr & HPAGE_MASK) | opt), 1723 [r3] "a" (asce), [m4] "i" (local) 1724 : "cc" ); 1725 } 1726 } 1727 1728 static __always_inline void __pudp_idte(unsigned long addr, pud_t *pudp, 1729 unsigned long opt, unsigned long asce, 1730 int local) 1731 { 1732 unsigned long r3o; 1733 1734 r3o = __pa(pudp) - pud_index(addr) * sizeof(pud_t); 1735 r3o |= _ASCE_TYPE_REGION3; 1736 if (__builtin_constant_p(opt) && opt == 0) { 1737 /* flush without guest asce */ 1738 asm volatile( 1739 " idte %[r1],0,%[r2],%[m4]" 1740 : "+m" (*pudp) 1741 : [r1] "a" (r3o), [r2] "a" ((addr & PUD_MASK)), 1742 [m4] "i" (local) 1743 : "cc"); 1744 } else { 1745 /* flush with guest asce */ 1746 asm volatile( 1747 " idte %[r1],%[r3],%[r2],%[m4]" 1748 : "+m" (*pudp) 1749 : [r1] "a" (r3o), [r2] "a" ((addr & PUD_MASK) | opt), 1750 [r3] "a" (asce), [m4] "i" (local) 1751 : "cc" ); 1752 } 1753 } 1754 1755 pmd_t pmdp_xchg_direct(struct mm_struct *, unsigned long, pmd_t *, pmd_t); 1756 pmd_t pmdp_xchg_lazy(struct mm_struct *, unsigned long, pmd_t *, pmd_t); 1757 pud_t pudp_xchg_direct(struct mm_struct *, unsigned long, pud_t *, pud_t); 1758 1759 #ifdef CONFIG_TRANSPARENT_HUGEPAGE 1760 1761 #define __HAVE_ARCH_PGTABLE_DEPOSIT 1762 void pgtable_trans_huge_deposit(struct mm_struct *mm, pmd_t *pmdp, 1763 pgtable_t pgtable); 1764 1765 #define __HAVE_ARCH_PGTABLE_WITHDRAW 1766 pgtable_t pgtable_trans_huge_withdraw(struct mm_struct *mm, pmd_t *pmdp); 1767 1768 #define __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS 1769 static inline int pmdp_set_access_flags(struct vm_area_struct *vma, 1770 unsigned long addr, pmd_t *pmdp, 1771 pmd_t entry, int dirty) 1772 { 1773 VM_BUG_ON(addr & ~HPAGE_MASK); 1774 1775 entry = pmd_mkyoung(entry); 1776 if (dirty) 1777 entry = pmd_mkdirty(entry); 1778 if (pmd_val(*pmdp) == pmd_val(entry)) 1779 return 0; 1780 pmdp_xchg_direct(vma->vm_mm, addr, pmdp, entry); 1781 return 1; 1782 } 1783 1784 #define __HAVE_ARCH_PMDP_TEST_AND_CLEAR_YOUNG 1785 static inline int pmdp_test_and_clear_young(struct vm_area_struct *vma, 1786 unsigned long addr, pmd_t *pmdp) 1787 { 1788 pmd_t pmd = *pmdp; 1789 1790 pmd = pmdp_xchg_direct(vma->vm_mm, addr, pmdp, pmd_mkold(pmd)); 1791 return pmd_young(pmd); 1792 } 1793 1794 #define __HAVE_ARCH_PMDP_CLEAR_YOUNG_FLUSH 1795 static inline int pmdp_clear_flush_young(struct vm_area_struct *vma, 1796 unsigned long addr, pmd_t *pmdp) 1797 { 1798 VM_BUG_ON(addr & ~HPAGE_MASK); 1799 return pmdp_test_and_clear_young(vma, addr, pmdp); 1800 } 1801 1802 static inline void set_pmd_at(struct mm_struct *mm, unsigned long addr, 1803 pmd_t *pmdp, pmd_t entry) 1804 { 1805 set_pmd(pmdp, entry); 1806 } 1807 1808 static inline pmd_t pmd_mkhuge(pmd_t pmd) 1809 { 1810 pmd = set_pmd_bit(pmd, __pgprot(_SEGMENT_ENTRY_LARGE)); 1811 pmd = set_pmd_bit(pmd, __pgprot(_SEGMENT_ENTRY_YOUNG)); 1812 return set_pmd_bit(pmd, __pgprot(_SEGMENT_ENTRY_PROTECT)); 1813 } 1814 1815 #define __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR 1816 static inline pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm, 1817 unsigned long addr, pmd_t *pmdp) 1818 { 1819 return pmdp_xchg_direct(mm, addr, pmdp, __pmd(_SEGMENT_ENTRY_EMPTY)); 1820 } 1821 1822 #define __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR_FULL 1823 static inline pmd_t pmdp_huge_get_and_clear_full(struct vm_area_struct *vma, 1824 unsigned long addr, 1825 pmd_t *pmdp, int full) 1826 { 1827 if (full) { 1828 pmd_t pmd = *pmdp; 1829 set_pmd(pmdp, __pmd(_SEGMENT_ENTRY_EMPTY)); 1830 return pmd; 1831 } 1832 return pmdp_xchg_lazy(vma->vm_mm, addr, pmdp, __pmd(_SEGMENT_ENTRY_EMPTY)); 1833 } 1834 1835 #define __HAVE_ARCH_PMDP_HUGE_CLEAR_FLUSH 1836 static inline pmd_t pmdp_huge_clear_flush(struct vm_area_struct *vma, 1837 unsigned long addr, pmd_t *pmdp) 1838 { 1839 return pmdp_huge_get_and_clear(vma->vm_mm, addr, pmdp); 1840 } 1841 1842 #define __HAVE_ARCH_PMDP_INVALIDATE 1843 static inline pmd_t pmdp_invalidate(struct vm_area_struct *vma, 1844 unsigned long addr, pmd_t *pmdp) 1845 { 1846 pmd_t pmd; 1847 1848 VM_WARN_ON_ONCE(!pmd_present(*pmdp)); 1849 pmd = __pmd(pmd_val(*pmdp) | _SEGMENT_ENTRY_INVALID); 1850 return pmdp_xchg_direct(vma->vm_mm, addr, pmdp, pmd); 1851 } 1852 1853 #define __HAVE_ARCH_PMDP_SET_WRPROTECT 1854 static inline void pmdp_set_wrprotect(struct mm_struct *mm, 1855 unsigned long addr, pmd_t *pmdp) 1856 { 1857 pmd_t pmd = *pmdp; 1858 1859 if (pmd_write(pmd)) 1860 pmd = pmdp_xchg_lazy(mm, addr, pmdp, pmd_wrprotect(pmd)); 1861 } 1862 1863 static inline pmd_t pmdp_collapse_flush(struct vm_area_struct *vma, 1864 unsigned long address, 1865 pmd_t *pmdp) 1866 { 1867 return pmdp_huge_get_and_clear(vma->vm_mm, address, pmdp); 1868 } 1869 #define pmdp_collapse_flush pmdp_collapse_flush 1870 1871 #define pfn_pmd(pfn, pgprot) mk_pmd_phys(((pfn) << PAGE_SHIFT), (pgprot)) 1872 1873 static inline int pmd_trans_huge(pmd_t pmd) 1874 { 1875 return pmd_leaf(pmd); 1876 } 1877 1878 #define has_transparent_hugepage has_transparent_hugepage 1879 static inline int has_transparent_hugepage(void) 1880 { 1881 return cpu_has_edat1() ? 1 : 0; 1882 } 1883 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ 1884 1885 /* 1886 * 64 bit swap entry format: 1887 * A page-table entry has some bits we have to treat in a special way. 1888 * Bits 54 and 63 are used to indicate the page type. Bit 53 marks the pte 1889 * as invalid. 1890 * A swap pte is indicated by bit pattern (pte & 0x201) == 0x200 1891 * | offset |E11XX|type |S0| 1892 * |0000000000111111111122222222223333333333444444444455|55555|55566|66| 1893 * |0123456789012345678901234567890123456789012345678901|23456|78901|23| 1894 * 1895 * Bits 0-51 store the offset. 1896 * Bit 52 (E) is used to remember PG_anon_exclusive. 1897 * Bits 57-61 store the type. 1898 * Bit 62 (S) is used for softdirty tracking. 1899 * Bits 55 and 56 (X) are unused. 1900 */ 1901 1902 #define __SWP_OFFSET_MASK ((1UL << 52) - 1) 1903 #define __SWP_OFFSET_SHIFT 12 1904 #define __SWP_TYPE_MASK ((1UL << 5) - 1) 1905 #define __SWP_TYPE_SHIFT 2 1906 1907 static inline pte_t mk_swap_pte(unsigned long type, unsigned long offset) 1908 { 1909 unsigned long pteval; 1910 1911 pteval = _PAGE_INVALID | _PAGE_PROTECT; 1912 pteval |= (offset & __SWP_OFFSET_MASK) << __SWP_OFFSET_SHIFT; 1913 pteval |= (type & __SWP_TYPE_MASK) << __SWP_TYPE_SHIFT; 1914 return __pte(pteval); 1915 } 1916 1917 static inline unsigned long __swp_type(swp_entry_t entry) 1918 { 1919 return (entry.val >> __SWP_TYPE_SHIFT) & __SWP_TYPE_MASK; 1920 } 1921 1922 static inline unsigned long __swp_offset(swp_entry_t entry) 1923 { 1924 return (entry.val >> __SWP_OFFSET_SHIFT) & __SWP_OFFSET_MASK; 1925 } 1926 1927 static inline swp_entry_t __swp_entry(unsigned long type, unsigned long offset) 1928 { 1929 return (swp_entry_t) { pte_val(mk_swap_pte(type, offset)) }; 1930 } 1931 1932 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) 1933 #define __swp_entry_to_pte(x) ((pte_t) { (x).val }) 1934 1935 /* 1936 * 64 bit swap entry format for REGION3 and SEGMENT table entries (RSTE) 1937 * Bits 59 and 63 are used to indicate the swap entry. Bit 58 marks the rste 1938 * as invalid. 1939 * A swap entry is indicated by bit pattern (rste & 0x011) == 0x010 1940 * | offset |Xtype |11TT|S0| 1941 * |0000000000111111111122222222223333333333444444444455|555555|5566|66| 1942 * |0123456789012345678901234567890123456789012345678901|234567|8901|23| 1943 * 1944 * Bits 0-51 store the offset. 1945 * Bits 53-57 store the type. 1946 * Bit 62 (S) is used for softdirty tracking. 1947 * Bits 60-61 (TT) indicate the table type: 0x01 for REGION3 and 0x00 for SEGMENT. 1948 * Bit 52 (X) is unused. 1949 */ 1950 1951 #define __SWP_OFFSET_MASK_RSTE ((1UL << 52) - 1) 1952 #define __SWP_OFFSET_SHIFT_RSTE 12 1953 #define __SWP_TYPE_MASK_RSTE ((1UL << 5) - 1) 1954 #define __SWP_TYPE_SHIFT_RSTE 6 1955 1956 /* 1957 * TT bits set to 0x00 == SEGMENT. For REGION3 entries, caller must add R3 1958 * bits 0x01. See also __set_huge_pte_at(). 1959 */ 1960 static inline unsigned long mk_swap_rste(unsigned long type, unsigned long offset) 1961 { 1962 unsigned long rste; 1963 1964 rste = _RST_ENTRY_INVALID | _RST_ENTRY_COMM; 1965 rste |= (offset & __SWP_OFFSET_MASK_RSTE) << __SWP_OFFSET_SHIFT_RSTE; 1966 rste |= (type & __SWP_TYPE_MASK_RSTE) << __SWP_TYPE_SHIFT_RSTE; 1967 return rste; 1968 } 1969 1970 static inline unsigned long __swp_type_rste(swp_entry_t entry) 1971 { 1972 return (entry.val >> __SWP_TYPE_SHIFT_RSTE) & __SWP_TYPE_MASK_RSTE; 1973 } 1974 1975 static inline unsigned long __swp_offset_rste(swp_entry_t entry) 1976 { 1977 return (entry.val >> __SWP_OFFSET_SHIFT_RSTE) & __SWP_OFFSET_MASK_RSTE; 1978 } 1979 1980 #define __rste_to_swp_entry(rste) ((swp_entry_t) { rste }) 1981 1982 extern int vmem_add_mapping(unsigned long start, unsigned long size); 1983 extern void vmem_remove_mapping(unsigned long start, unsigned long size); 1984 extern int __vmem_map_4k_page(unsigned long addr, unsigned long phys, pgprot_t prot, bool alloc); 1985 extern int vmem_map_4k_page(unsigned long addr, unsigned long phys, pgprot_t prot); 1986 extern void vmem_unmap_4k_page(unsigned long addr); 1987 extern pte_t *vmem_get_alloc_pte(unsigned long addr, bool alloc); 1988 extern int s390_enable_sie(void); 1989 extern int s390_enable_skey(void); 1990 extern void s390_reset_cmma(struct mm_struct *mm); 1991 1992 /* s390 has a private copy of get unmapped area to deal with cache synonyms */ 1993 #define HAVE_ARCH_UNMAPPED_AREA 1994 #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN 1995 1996 #define pmd_pgtable(pmd) \ 1997 ((pgtable_t)__va(pmd_val(pmd) & -sizeof(pte_t)*PTRS_PER_PTE)) 1998 1999 static inline unsigned long gmap_pgste_get_pgt_addr(unsigned long *pgt) 2000 { 2001 unsigned long *pgstes, res; 2002 2003 pgstes = pgt + _PAGE_ENTRIES; 2004 2005 res = (pgstes[0] & PGSTE_ST2_MASK) << 16; 2006 res |= pgstes[1] & PGSTE_ST2_MASK; 2007 res |= (pgstes[2] & PGSTE_ST2_MASK) >> 16; 2008 res |= (pgstes[3] & PGSTE_ST2_MASK) >> 32; 2009 2010 return res; 2011 } 2012 2013 #endif /* _S390_PAGE_H */ 2014