1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * arch/arm/include/asm/tlbflush.h 4 * 5 * Copyright (C) 1999-2003 Russell King 6 */ 7 #ifndef _ASMARM_TLBFLUSH_H 8 #define _ASMARM_TLBFLUSH_H 9 10 #ifndef __ASSEMBLY__ 11 # include <linux/mm_types.h> 12 #endif 13 14 #ifdef CONFIG_MMU 15 16 #include <asm/glue.h> 17 18 #define TLB_V4_U_PAGE (1 << 1) 19 #define TLB_V4_D_PAGE (1 << 2) 20 #define TLB_V4_I_PAGE (1 << 3) 21 #define TLB_V6_U_PAGE (1 << 4) 22 #define TLB_V6_D_PAGE (1 << 5) 23 #define TLB_V6_I_PAGE (1 << 6) 24 25 #define TLB_V4_U_FULL (1 << 9) 26 #define TLB_V4_D_FULL (1 << 10) 27 #define TLB_V4_I_FULL (1 << 11) 28 #define TLB_V6_U_FULL (1 << 12) 29 #define TLB_V6_D_FULL (1 << 13) 30 #define TLB_V6_I_FULL (1 << 14) 31 32 #define TLB_V6_U_ASID (1 << 16) 33 #define TLB_V6_D_ASID (1 << 17) 34 #define TLB_V6_I_ASID (1 << 18) 35 36 #define TLB_V6_BP (1 << 19) 37 38 /* Unified Inner Shareable TLB operations (ARMv7 MP extensions) */ 39 #define TLB_V7_UIS_PAGE (1 << 20) 40 #define TLB_V7_UIS_FULL (1 << 21) 41 #define TLB_V7_UIS_ASID (1 << 22) 42 #define TLB_V7_UIS_BP (1 << 23) 43 44 #define TLB_BARRIER (1 << 28) 45 #define TLB_L2CLEAN_FR (1 << 29) /* Feroceon */ 46 #define TLB_DCLEAN (1 << 30) 47 #define TLB_WB (1 << 31) 48 49 /* 50 * MMU TLB Model 51 * ============= 52 * 53 * We have the following to choose from: 54 * v4 - ARMv4 without write buffer 55 * v4wb - ARMv4 with write buffer without I TLB flush entry instruction 56 * v4wbi - ARMv4 with write buffer with I TLB flush entry instruction 57 * fr - Feroceon (v4wbi with non-outer-cacheable page table walks) 58 * fa - Faraday (v4 with write buffer with UTLB) 59 * v6wbi - ARMv6 with write buffer with I TLB flush entry instruction 60 * v7wbi - identical to v6wbi 61 */ 62 #undef _TLB 63 #undef MULTI_TLB 64 65 #ifdef CONFIG_SMP_ON_UP 66 #define MULTI_TLB 1 67 #endif 68 69 #define v4_tlb_flags (TLB_V4_U_FULL | TLB_V4_U_PAGE) 70 71 #ifdef CONFIG_CPU_TLB_V4WT 72 # define v4_possible_flags v4_tlb_flags 73 # define v4_always_flags v4_tlb_flags 74 # ifdef _TLB 75 # define MULTI_TLB 1 76 # else 77 # define _TLB v4 78 # endif 79 #else 80 # define v4_possible_flags 0 81 # define v4_always_flags (-1UL) 82 #endif 83 84 #define fa_tlb_flags (TLB_WB | TLB_DCLEAN | TLB_BARRIER | \ 85 TLB_V4_U_FULL | TLB_V4_U_PAGE) 86 87 #ifdef CONFIG_CPU_TLB_FA 88 # define fa_possible_flags fa_tlb_flags 89 # define fa_always_flags fa_tlb_flags 90 # ifdef _TLB 91 # define MULTI_TLB 1 92 # else 93 # define _TLB fa 94 # endif 95 #else 96 # define fa_possible_flags 0 97 # define fa_always_flags (-1UL) 98 #endif 99 100 #define v4wbi_tlb_flags (TLB_WB | TLB_DCLEAN | \ 101 TLB_V4_I_FULL | TLB_V4_D_FULL | \ 102 TLB_V4_I_PAGE | TLB_V4_D_PAGE) 103 104 #ifdef CONFIG_CPU_TLB_V4WBI 105 # define v4wbi_possible_flags v4wbi_tlb_flags 106 # define v4wbi_always_flags v4wbi_tlb_flags 107 # ifdef _TLB 108 # define MULTI_TLB 1 109 # else 110 # define _TLB v4wbi 111 # endif 112 #else 113 # define v4wbi_possible_flags 0 114 # define v4wbi_always_flags (-1UL) 115 #endif 116 117 #define fr_tlb_flags (TLB_WB | TLB_DCLEAN | TLB_L2CLEAN_FR | \ 118 TLB_V4_I_FULL | TLB_V4_D_FULL | \ 119 TLB_V4_I_PAGE | TLB_V4_D_PAGE) 120 121 #ifdef CONFIG_CPU_TLB_FEROCEON 122 # define fr_possible_flags fr_tlb_flags 123 # define fr_always_flags fr_tlb_flags 124 # ifdef _TLB 125 # define MULTI_TLB 1 126 # else 127 # define _TLB v4wbi 128 # endif 129 #else 130 # define fr_possible_flags 0 131 # define fr_always_flags (-1UL) 132 #endif 133 134 #define v4wb_tlb_flags (TLB_WB | TLB_DCLEAN | \ 135 TLB_V4_I_FULL | TLB_V4_D_FULL | \ 136 TLB_V4_D_PAGE) 137 138 #ifdef CONFIG_CPU_TLB_V4WB 139 # define v4wb_possible_flags v4wb_tlb_flags 140 # define v4wb_always_flags v4wb_tlb_flags 141 # ifdef _TLB 142 # define MULTI_TLB 1 143 # else 144 # define _TLB v4wb 145 # endif 146 #else 147 # define v4wb_possible_flags 0 148 # define v4wb_always_flags (-1UL) 149 #endif 150 151 #define v6wbi_tlb_flags (TLB_WB | TLB_DCLEAN | TLB_BARRIER | \ 152 TLB_V6_I_FULL | TLB_V6_D_FULL | \ 153 TLB_V6_I_PAGE | TLB_V6_D_PAGE | \ 154 TLB_V6_I_ASID | TLB_V6_D_ASID | \ 155 TLB_V6_BP) 156 157 #ifdef CONFIG_CPU_TLB_V6 158 # define v6wbi_possible_flags v6wbi_tlb_flags 159 # define v6wbi_always_flags v6wbi_tlb_flags 160 # ifdef _TLB 161 # define MULTI_TLB 1 162 # else 163 # define _TLB v6wbi 164 # endif 165 #else 166 # define v6wbi_possible_flags 0 167 # define v6wbi_always_flags (-1UL) 168 #endif 169 170 #define v7wbi_tlb_flags_smp (TLB_WB | TLB_BARRIER | \ 171 TLB_V7_UIS_FULL | TLB_V7_UIS_PAGE | \ 172 TLB_V7_UIS_ASID | TLB_V7_UIS_BP) 173 #define v7wbi_tlb_flags_up (TLB_WB | TLB_DCLEAN | TLB_BARRIER | \ 174 TLB_V6_U_FULL | TLB_V6_U_PAGE | \ 175 TLB_V6_U_ASID | TLB_V6_BP) 176 177 #ifdef CONFIG_CPU_TLB_V7 178 179 # ifdef CONFIG_SMP_ON_UP 180 # define v7wbi_possible_flags (v7wbi_tlb_flags_smp | v7wbi_tlb_flags_up) 181 # define v7wbi_always_flags (v7wbi_tlb_flags_smp & v7wbi_tlb_flags_up) 182 # elif defined(CONFIG_SMP) 183 # define v7wbi_possible_flags v7wbi_tlb_flags_smp 184 # define v7wbi_always_flags v7wbi_tlb_flags_smp 185 # else 186 # define v7wbi_possible_flags v7wbi_tlb_flags_up 187 # define v7wbi_always_flags v7wbi_tlb_flags_up 188 # endif 189 # ifdef _TLB 190 # define MULTI_TLB 1 191 # else 192 # define _TLB v7wbi 193 # endif 194 #else 195 # define v7wbi_possible_flags 0 196 # define v7wbi_always_flags (-1UL) 197 #endif 198 199 #ifndef _TLB 200 #error Unknown TLB model 201 #endif 202 203 #ifndef __ASSEMBLY__ 204 205 #include <linux/sched.h> 206 207 struct cpu_tlb_fns { 208 void (*flush_user_range)(unsigned long, unsigned long, struct vm_area_struct *); 209 void (*flush_kern_range)(unsigned long, unsigned long); 210 unsigned long tlb_flags; 211 }; 212 213 /* 214 * Select the calling method 215 */ 216 #ifdef MULTI_TLB 217 218 #define __cpu_flush_user_tlb_range cpu_tlb.flush_user_range 219 #define __cpu_flush_kern_tlb_range cpu_tlb.flush_kern_range 220 221 #else 222 223 #define __cpu_flush_user_tlb_range __glue(_TLB,_flush_user_tlb_range) 224 #define __cpu_flush_kern_tlb_range __glue(_TLB,_flush_kern_tlb_range) 225 226 extern void __cpu_flush_user_tlb_range(unsigned long, unsigned long, struct vm_area_struct *); 227 extern void __cpu_flush_kern_tlb_range(unsigned long, unsigned long); 228 229 #endif 230 231 extern struct cpu_tlb_fns cpu_tlb; 232 233 #define __cpu_tlb_flags cpu_tlb.tlb_flags 234 235 /* 236 * TLB Management 237 * ============== 238 * 239 * The arch/arm/mm/tlb-*.S files implement these methods. 240 * 241 * The TLB specific code is expected to perform whatever tests it 242 * needs to determine if it should invalidate the TLB for each 243 * call. Start addresses are inclusive and end addresses are 244 * exclusive; it is safe to round these addresses down. 245 * 246 * flush_tlb_all() 247 * 248 * Invalidate the entire TLB. 249 * 250 * flush_tlb_mm(mm) 251 * 252 * Invalidate all TLB entries in a particular address 253 * space. 254 * - mm - mm_struct describing address space 255 * 256 * flush_tlb_range(vma,start,end) 257 * 258 * Invalidate a range of TLB entries in the specified 259 * address space. 260 * - mm - mm_struct describing address space 261 * - start - start address (may not be aligned) 262 * - end - end address (exclusive, may not be aligned) 263 * 264 * flush_tlb_page(vma, uaddr) 265 * 266 * Invalidate the specified page in the specified address range. 267 * - vma - vm_area_struct describing address range 268 * - vaddr - virtual address (may not be aligned) 269 */ 270 271 /* 272 * We optimise the code below by: 273 * - building a set of TLB flags that might be set in __cpu_tlb_flags 274 * - building a set of TLB flags that will always be set in __cpu_tlb_flags 275 * - if we're going to need __cpu_tlb_flags, access it once and only once 276 * 277 * This allows us to build optimal assembly for the single-CPU type case, 278 * and as close to optimal given the compiler constrants for multi-CPU 279 * case. We could do better for the multi-CPU case if the compiler 280 * implemented the "%?" method, but this has been discontinued due to too 281 * many people getting it wrong. 282 */ 283 #define possible_tlb_flags (v4_possible_flags | \ 284 v4wbi_possible_flags | \ 285 fr_possible_flags | \ 286 v4wb_possible_flags | \ 287 fa_possible_flags | \ 288 v6wbi_possible_flags | \ 289 v7wbi_possible_flags) 290 291 #define always_tlb_flags (v4_always_flags & \ 292 v4wbi_always_flags & \ 293 fr_always_flags & \ 294 v4wb_always_flags & \ 295 fa_always_flags & \ 296 v6wbi_always_flags & \ 297 v7wbi_always_flags) 298 299 #define tlb_flag(f) ((always_tlb_flags & (f)) || (__tlb_flag & possible_tlb_flags & (f))) 300 301 #define __tlb_op(f, insnarg, arg) \ 302 do { \ 303 if (always_tlb_flags & (f)) \ 304 asm("mcr " insnarg \ 305 : : "r" (arg) : "cc"); \ 306 else if (possible_tlb_flags & (f)) \ 307 asm("tst %1, %2\n\t" \ 308 "mcrne " insnarg \ 309 : : "r" (arg), "r" (__tlb_flag), "Ir" (f) \ 310 : "cc"); \ 311 } while (0) 312 313 #define tlb_op(f, regs, arg) __tlb_op(f, "p15, 0, %0, " regs, arg) 314 #define tlb_l2_op(f, regs, arg) __tlb_op(f, "p15, 1, %0, " regs, arg) 315 316 static inline void __local_flush_tlb_all(void) 317 { 318 const int zero = 0; 319 const unsigned int __tlb_flag = __cpu_tlb_flags; 320 321 tlb_op(TLB_V4_U_FULL | TLB_V6_U_FULL, "c8, c7, 0", zero); 322 tlb_op(TLB_V4_D_FULL | TLB_V6_D_FULL, "c8, c6, 0", zero); 323 tlb_op(TLB_V4_I_FULL | TLB_V6_I_FULL, "c8, c5, 0", zero); 324 } 325 326 static inline void local_flush_tlb_all(void) 327 { 328 const int zero = 0; 329 const unsigned int __tlb_flag = __cpu_tlb_flags; 330 331 if (tlb_flag(TLB_WB)) 332 dsb(nshst); 333 334 __local_flush_tlb_all(); 335 tlb_op(TLB_V7_UIS_FULL, "c8, c7, 0", zero); 336 337 if (tlb_flag(TLB_BARRIER)) { 338 dsb(nsh); 339 isb(); 340 } 341 } 342 343 static inline void __flush_tlb_all(void) 344 { 345 const int zero = 0; 346 const unsigned int __tlb_flag = __cpu_tlb_flags; 347 348 if (tlb_flag(TLB_WB)) 349 dsb(ishst); 350 351 __local_flush_tlb_all(); 352 tlb_op(TLB_V7_UIS_FULL, "c8, c3, 0", zero); 353 354 if (tlb_flag(TLB_BARRIER)) { 355 dsb(ish); 356 isb(); 357 } 358 } 359 360 static inline void __local_flush_tlb_mm(struct mm_struct *mm) 361 { 362 const int zero = 0; 363 const int asid = ASID(mm); 364 const unsigned int __tlb_flag = __cpu_tlb_flags; 365 366 if (possible_tlb_flags & (TLB_V4_U_FULL|TLB_V4_D_FULL|TLB_V4_I_FULL)) { 367 if (cpumask_test_cpu(smp_processor_id(), mm_cpumask(mm))) { 368 tlb_op(TLB_V4_U_FULL, "c8, c7, 0", zero); 369 tlb_op(TLB_V4_D_FULL, "c8, c6, 0", zero); 370 tlb_op(TLB_V4_I_FULL, "c8, c5, 0", zero); 371 } 372 } 373 374 tlb_op(TLB_V6_U_ASID, "c8, c7, 2", asid); 375 tlb_op(TLB_V6_D_ASID, "c8, c6, 2", asid); 376 tlb_op(TLB_V6_I_ASID, "c8, c5, 2", asid); 377 } 378 379 static inline void local_flush_tlb_mm(struct mm_struct *mm) 380 { 381 const int asid = ASID(mm); 382 const unsigned int __tlb_flag = __cpu_tlb_flags; 383 384 if (tlb_flag(TLB_WB)) 385 dsb(nshst); 386 387 __local_flush_tlb_mm(mm); 388 tlb_op(TLB_V7_UIS_ASID, "c8, c7, 2", asid); 389 390 if (tlb_flag(TLB_BARRIER)) 391 dsb(nsh); 392 } 393 394 static inline void __flush_tlb_mm(struct mm_struct *mm) 395 { 396 const unsigned int __tlb_flag = __cpu_tlb_flags; 397 398 if (tlb_flag(TLB_WB)) 399 dsb(ishst); 400 401 __local_flush_tlb_mm(mm); 402 #ifdef CONFIG_ARM_ERRATA_720789 403 tlb_op(TLB_V7_UIS_ASID, "c8, c3, 0", 0); 404 #else 405 tlb_op(TLB_V7_UIS_ASID, "c8, c3, 2", ASID(mm)); 406 #endif 407 408 if (tlb_flag(TLB_BARRIER)) 409 dsb(ish); 410 } 411 412 static inline void 413 __local_flush_tlb_page(struct vm_area_struct *vma, unsigned long uaddr) 414 { 415 const int zero = 0; 416 const unsigned int __tlb_flag = __cpu_tlb_flags; 417 418 uaddr = (uaddr & PAGE_MASK) | ASID(vma->vm_mm); 419 420 if (possible_tlb_flags & (TLB_V4_U_PAGE|TLB_V4_D_PAGE|TLB_V4_I_PAGE|TLB_V4_I_FULL) && 421 cpumask_test_cpu(smp_processor_id(), mm_cpumask(vma->vm_mm))) { 422 tlb_op(TLB_V4_U_PAGE, "c8, c7, 1", uaddr); 423 tlb_op(TLB_V4_D_PAGE, "c8, c6, 1", uaddr); 424 tlb_op(TLB_V4_I_PAGE, "c8, c5, 1", uaddr); 425 if (!tlb_flag(TLB_V4_I_PAGE) && tlb_flag(TLB_V4_I_FULL)) 426 asm("mcr p15, 0, %0, c8, c5, 0" : : "r" (zero) : "cc"); 427 } 428 429 tlb_op(TLB_V6_U_PAGE, "c8, c7, 1", uaddr); 430 tlb_op(TLB_V6_D_PAGE, "c8, c6, 1", uaddr); 431 tlb_op(TLB_V6_I_PAGE, "c8, c5, 1", uaddr); 432 } 433 434 static inline void 435 local_flush_tlb_page(struct vm_area_struct *vma, unsigned long uaddr) 436 { 437 const unsigned int __tlb_flag = __cpu_tlb_flags; 438 439 uaddr = (uaddr & PAGE_MASK) | ASID(vma->vm_mm); 440 441 if (tlb_flag(TLB_WB)) 442 dsb(nshst); 443 444 __local_flush_tlb_page(vma, uaddr); 445 tlb_op(TLB_V7_UIS_PAGE, "c8, c7, 1", uaddr); 446 447 if (tlb_flag(TLB_BARRIER)) 448 dsb(nsh); 449 } 450 451 static inline void 452 __flush_tlb_page(struct vm_area_struct *vma, unsigned long uaddr) 453 { 454 const unsigned int __tlb_flag = __cpu_tlb_flags; 455 456 uaddr = (uaddr & PAGE_MASK) | ASID(vma->vm_mm); 457 458 if (tlb_flag(TLB_WB)) 459 dsb(ishst); 460 461 __local_flush_tlb_page(vma, uaddr); 462 #ifdef CONFIG_ARM_ERRATA_720789 463 tlb_op(TLB_V7_UIS_PAGE, "c8, c3, 3", uaddr & PAGE_MASK); 464 #else 465 tlb_op(TLB_V7_UIS_PAGE, "c8, c3, 1", uaddr); 466 #endif 467 468 if (tlb_flag(TLB_BARRIER)) 469 dsb(ish); 470 } 471 472 static inline void __local_flush_tlb_kernel_page(unsigned long kaddr) 473 { 474 const int zero = 0; 475 const unsigned int __tlb_flag = __cpu_tlb_flags; 476 477 tlb_op(TLB_V4_U_PAGE, "c8, c7, 1", kaddr); 478 tlb_op(TLB_V4_D_PAGE, "c8, c6, 1", kaddr); 479 tlb_op(TLB_V4_I_PAGE, "c8, c5, 1", kaddr); 480 if (!tlb_flag(TLB_V4_I_PAGE) && tlb_flag(TLB_V4_I_FULL)) 481 asm("mcr p15, 0, %0, c8, c5, 0" : : "r" (zero) : "cc"); 482 483 tlb_op(TLB_V6_U_PAGE, "c8, c7, 1", kaddr); 484 tlb_op(TLB_V6_D_PAGE, "c8, c6, 1", kaddr); 485 tlb_op(TLB_V6_I_PAGE, "c8, c5, 1", kaddr); 486 } 487 488 static inline void local_flush_tlb_kernel_page(unsigned long kaddr) 489 { 490 const unsigned int __tlb_flag = __cpu_tlb_flags; 491 492 kaddr &= PAGE_MASK; 493 494 if (tlb_flag(TLB_WB)) 495 dsb(nshst); 496 497 __local_flush_tlb_kernel_page(kaddr); 498 tlb_op(TLB_V7_UIS_PAGE, "c8, c7, 1", kaddr); 499 500 if (tlb_flag(TLB_BARRIER)) { 501 dsb(nsh); 502 isb(); 503 } 504 } 505 506 static inline void __flush_tlb_kernel_page(unsigned long kaddr) 507 { 508 const unsigned int __tlb_flag = __cpu_tlb_flags; 509 510 kaddr &= PAGE_MASK; 511 512 if (tlb_flag(TLB_WB)) 513 dsb(ishst); 514 515 __local_flush_tlb_kernel_page(kaddr); 516 tlb_op(TLB_V7_UIS_PAGE, "c8, c3, 1", kaddr); 517 518 if (tlb_flag(TLB_BARRIER)) { 519 dsb(ish); 520 isb(); 521 } 522 } 523 524 /* 525 * Branch predictor maintenance is paired with full TLB invalidation, so 526 * there is no need for any barriers here. 527 */ 528 static inline void __local_flush_bp_all(void) 529 { 530 const int zero = 0; 531 const unsigned int __tlb_flag = __cpu_tlb_flags; 532 533 if (tlb_flag(TLB_V6_BP)) 534 asm("mcr p15, 0, %0, c7, c5, 6" : : "r" (zero)); 535 } 536 537 static inline void local_flush_bp_all(void) 538 { 539 const int zero = 0; 540 const unsigned int __tlb_flag = __cpu_tlb_flags; 541 542 __local_flush_bp_all(); 543 if (tlb_flag(TLB_V7_UIS_BP)) 544 asm("mcr p15, 0, %0, c7, c5, 6" : : "r" (zero)); 545 } 546 547 static inline void __flush_bp_all(void) 548 { 549 const int zero = 0; 550 const unsigned int __tlb_flag = __cpu_tlb_flags; 551 552 __local_flush_bp_all(); 553 if (tlb_flag(TLB_V7_UIS_BP)) 554 asm("mcr p15, 0, %0, c7, c1, 6" : : "r" (zero)); 555 } 556 557 /* 558 * flush_pmd_entry 559 * 560 * Flush a PMD entry (word aligned, or double-word aligned) to 561 * RAM if the TLB for the CPU we are running on requires this. 562 * This is typically used when we are creating PMD entries. 563 * 564 * clean_pmd_entry 565 * 566 * Clean (but don't drain the write buffer) if the CPU requires 567 * these operations. This is typically used when we are removing 568 * PMD entries. 569 */ 570 static inline void flush_pmd_entry(void *pmd) 571 { 572 const unsigned int __tlb_flag = __cpu_tlb_flags; 573 574 tlb_op(TLB_DCLEAN, "c7, c10, 1 @ flush_pmd", pmd); 575 tlb_l2_op(TLB_L2CLEAN_FR, "c15, c9, 1 @ L2 flush_pmd", pmd); 576 577 if (tlb_flag(TLB_WB)) 578 dsb(ishst); 579 } 580 581 static inline void clean_pmd_entry(void *pmd) 582 { 583 const unsigned int __tlb_flag = __cpu_tlb_flags; 584 585 tlb_op(TLB_DCLEAN, "c7, c10, 1 @ flush_pmd", pmd); 586 tlb_l2_op(TLB_L2CLEAN_FR, "c15, c9, 1 @ L2 flush_pmd", pmd); 587 } 588 589 #undef tlb_op 590 #undef tlb_flag 591 #undef always_tlb_flags 592 #undef possible_tlb_flags 593 594 /* 595 * Convert calls to our calling convention. 596 */ 597 #define local_flush_tlb_range(vma,start,end) __cpu_flush_user_tlb_range(start,end,vma) 598 #define local_flush_tlb_kernel_range(s,e) __cpu_flush_kern_tlb_range(s,e) 599 600 #ifndef CONFIG_SMP 601 #define flush_tlb_all local_flush_tlb_all 602 #define flush_tlb_mm local_flush_tlb_mm 603 #define flush_tlb_page local_flush_tlb_page 604 #define flush_tlb_kernel_page local_flush_tlb_kernel_page 605 #define flush_tlb_range local_flush_tlb_range 606 #define flush_tlb_kernel_range local_flush_tlb_kernel_range 607 #define flush_bp_all local_flush_bp_all 608 #else 609 extern void flush_tlb_all(void); 610 extern void flush_tlb_mm(struct mm_struct *mm); 611 extern void flush_tlb_page(struct vm_area_struct *vma, unsigned long uaddr); 612 extern void flush_tlb_kernel_page(unsigned long kaddr); 613 extern void flush_tlb_range(struct vm_area_struct *vma, unsigned long start, unsigned long end); 614 extern void flush_tlb_kernel_range(unsigned long start, unsigned long end); 615 extern void flush_bp_all(void); 616 #endif 617 618 /* 619 * If PG_dcache_clean is not set for the page, we need to ensure that any 620 * cache entries for the kernels virtual memory range are written 621 * back to the page. On ARMv6 and later, the cache coherency is handled via 622 * the set_pte_at() function. 623 */ 624 #if __LINUX_ARM_ARCH__ < 6 625 extern void update_mmu_cache(struct vm_area_struct *vma, unsigned long addr, 626 pte_t *ptep); 627 #else 628 static inline void update_mmu_cache(struct vm_area_struct *vma, 629 unsigned long addr, pte_t *ptep) 630 { 631 } 632 #endif 633 634 #define update_mmu_cache_pmd(vma, address, pmd) do { } while (0) 635 636 #endif 637 638 #elif defined(CONFIG_SMP) /* !CONFIG_MMU */ 639 640 #ifndef __ASSEMBLY__ 641 static inline void local_flush_tlb_all(void) { } 642 static inline void local_flush_tlb_mm(struct mm_struct *mm) { } 643 static inline void local_flush_tlb_page(struct vm_area_struct *vma, unsigned long uaddr) { } 644 static inline void local_flush_tlb_kernel_page(unsigned long kaddr) { } 645 static inline void local_flush_tlb_range(struct vm_area_struct *vma, unsigned long start, unsigned long end) { } 646 static inline void local_flush_tlb_kernel_range(unsigned long start, unsigned long end) { } 647 static inline void local_flush_bp_all(void) { } 648 649 extern void flush_tlb_all(void); 650 extern void flush_tlb_mm(struct mm_struct *mm); 651 extern void flush_tlb_page(struct vm_area_struct *vma, unsigned long uaddr); 652 extern void flush_tlb_kernel_page(unsigned long kaddr); 653 extern void flush_tlb_range(struct vm_area_struct *vma, unsigned long start, unsigned long end); 654 extern void flush_tlb_kernel_range(unsigned long start, unsigned long end); 655 extern void flush_bp_all(void); 656 #endif /* __ASSEMBLY__ */ 657 658 #endif 659 660 #ifndef __ASSEMBLY__ 661 #ifdef CONFIG_ARM_ERRATA_798181 662 extern void erratum_a15_798181_init(void); 663 #else 664 static inline void erratum_a15_798181_init(void) {} 665 #endif 666 extern bool (*erratum_a15_798181_handler)(void); 667 668 static inline bool erratum_a15_798181(void) 669 { 670 if (unlikely(IS_ENABLED(CONFIG_ARM_ERRATA_798181) && 671 erratum_a15_798181_handler)) 672 return erratum_a15_798181_handler(); 673 return false; 674 } 675 #endif 676 677 #endif 678