1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _ASM_POWERPC_MMU_H_ 3 #define _ASM_POWERPC_MMU_H_ 4 #ifdef __KERNEL__ 5 6 #include <linux/types.h> 7 8 #include <asm/asm-const.h> 9 10 /* 11 * MMU features bit definitions 12 */ 13 14 /* 15 * MMU families 16 */ 17 #define MMU_FTR_HPTE_TABLE ASM_CONST(0x00000001) 18 #define MMU_FTR_TYPE_8xx ASM_CONST(0x00000002) 19 #define MMU_FTR_TYPE_40x ASM_CONST(0x00000004) 20 #define MMU_FTR_TYPE_44x ASM_CONST(0x00000008) 21 #define MMU_FTR_TYPE_FSL_E ASM_CONST(0x00000010) 22 #define MMU_FTR_TYPE_47x ASM_CONST(0x00000020) 23 24 /* Radix page table supported and enabled */ 25 #define MMU_FTR_TYPE_RADIX ASM_CONST(0x00000040) 26 27 /* 28 * Individual features below. 29 */ 30 31 /* 32 * Supports KUAP feature 33 * key 0 controlling userspace addresses on radix 34 * Key 3 on hash 35 */ 36 #define MMU_FTR_BOOK3S_KUAP ASM_CONST(0x00000200) 37 38 /* 39 * Supports KUEP feature 40 * key 0 controlling userspace addresses on radix 41 * Key 3 on hash 42 */ 43 #define MMU_FTR_BOOK3S_KUEP ASM_CONST(0x00000400) 44 45 /* 46 * Support for memory protection keys. 47 */ 48 #define MMU_FTR_PKEY ASM_CONST(0x00000800) 49 50 /* Guest Translation Shootdown Enable */ 51 #define MMU_FTR_GTSE ASM_CONST(0x00001000) 52 53 /* 54 * Support for 68 bit VA space. We added that from ISA 2.05 55 */ 56 #define MMU_FTR_68_BIT_VA ASM_CONST(0x00002000) 57 /* 58 * Kernel read only support. 59 * We added the ppp value 0b110 in ISA 2.04. 60 */ 61 #define MMU_FTR_KERNEL_RO ASM_CONST(0x00004000) 62 63 /* 64 * We need to clear top 16bits of va (from the remaining 64 bits )in 65 * tlbie* instructions 66 */ 67 #define MMU_FTR_TLBIE_CROP_VA ASM_CONST(0x00008000) 68 69 /* Enable use of high BAT registers */ 70 #define MMU_FTR_USE_HIGH_BATS ASM_CONST(0x00010000) 71 72 /* Enable >32-bit physical addresses on 32-bit processor, only used 73 * by CONFIG_PPC_BOOK3S_32 currently as BookE supports that from day 1 74 */ 75 #define MMU_FTR_BIG_PHYS ASM_CONST(0x00020000) 76 77 /* Enable use of broadcast TLB invalidations. We don't always set it 78 * on processors that support it due to other constraints with the 79 * use of such invalidations 80 */ 81 #define MMU_FTR_USE_TLBIVAX_BCAST ASM_CONST(0x00040000) 82 83 /* Enable use of tlbilx invalidate instructions. 84 */ 85 #define MMU_FTR_USE_TLBILX ASM_CONST(0x00080000) 86 87 /* This indicates that the processor cannot handle multiple outstanding 88 * broadcast tlbivax or tlbsync. This makes the code use a spinlock 89 * around such invalidate forms. 90 */ 91 #define MMU_FTR_LOCK_BCAST_INVAL ASM_CONST(0x00100000) 92 93 /* This indicates that the processor doesn't handle way selection 94 * properly and needs SW to track and update the LRU state. This 95 * is specific to an errata on e300c2/c3/c4 class parts 96 */ 97 #define MMU_FTR_NEED_DTLB_SW_LRU ASM_CONST(0x00200000) 98 99 /* Enable use of TLB reservation. Processor should support tlbsrx. 100 * instruction and MAS0[WQ]. 101 */ 102 #define MMU_FTR_USE_TLBRSRV ASM_CONST(0x00800000) 103 104 /* Use paired MAS registers (MAS7||MAS3, etc.) 105 */ 106 #define MMU_FTR_USE_PAIRED_MAS ASM_CONST(0x01000000) 107 108 /* Doesn't support the B bit (1T segment) in SLBIE 109 */ 110 #define MMU_FTR_NO_SLBIE_B ASM_CONST(0x02000000) 111 112 /* Support 16M large pages 113 */ 114 #define MMU_FTR_16M_PAGE ASM_CONST(0x04000000) 115 116 /* Supports TLBIEL variant 117 */ 118 #define MMU_FTR_TLBIEL ASM_CONST(0x08000000) 119 120 /* Supports tlbies w/o locking 121 */ 122 #define MMU_FTR_LOCKLESS_TLBIE ASM_CONST(0x10000000) 123 124 /* Large pages can be marked CI 125 */ 126 #define MMU_FTR_CI_LARGE_PAGE ASM_CONST(0x20000000) 127 128 /* 1T segments available 129 */ 130 #define MMU_FTR_1T_SEGMENT ASM_CONST(0x40000000) 131 132 /* MMU feature bit sets for various CPUs */ 133 #define MMU_FTRS_DEFAULT_HPTE_ARCH_V2 (MMU_FTR_HPTE_TABLE | MMU_FTR_TLBIEL | MMU_FTR_16M_PAGE) 134 #define MMU_FTRS_POWER MMU_FTRS_DEFAULT_HPTE_ARCH_V2 135 #define MMU_FTRS_PPC970 MMU_FTRS_POWER | MMU_FTR_TLBIE_CROP_VA 136 #define MMU_FTRS_POWER5 MMU_FTRS_POWER | MMU_FTR_LOCKLESS_TLBIE 137 #define MMU_FTRS_POWER6 MMU_FTRS_POWER5 | MMU_FTR_KERNEL_RO | MMU_FTR_68_BIT_VA 138 #define MMU_FTRS_POWER7 MMU_FTRS_POWER6 139 #define MMU_FTRS_POWER8 MMU_FTRS_POWER6 140 #define MMU_FTRS_POWER9 MMU_FTRS_POWER6 141 #define MMU_FTRS_POWER10 MMU_FTRS_POWER6 142 #define MMU_FTRS_CELL MMU_FTRS_DEFAULT_HPTE_ARCH_V2 | \ 143 MMU_FTR_CI_LARGE_PAGE 144 #define MMU_FTRS_PA6T MMU_FTRS_DEFAULT_HPTE_ARCH_V2 | \ 145 MMU_FTR_CI_LARGE_PAGE | MMU_FTR_NO_SLBIE_B 146 #ifndef __ASSEMBLY__ 147 #include <linux/bug.h> 148 #include <asm/cputable.h> 149 #include <asm/page.h> 150 151 typedef pte_t *pgtable_t; 152 153 #ifdef CONFIG_PPC_FSL_BOOK3E 154 #include <asm/percpu.h> 155 DECLARE_PER_CPU(int, next_tlbcam_idx); 156 #endif 157 158 enum { 159 MMU_FTRS_POSSIBLE = 160 #if defined(CONFIG_PPC_BOOK3S_604) 161 MMU_FTR_HPTE_TABLE | 162 #endif 163 #ifdef CONFIG_PPC_8xx 164 MMU_FTR_TYPE_8xx | 165 #endif 166 #ifdef CONFIG_40x 167 MMU_FTR_TYPE_40x | 168 #endif 169 #ifdef CONFIG_PPC_47x 170 MMU_FTR_TYPE_47x | MMU_FTR_USE_TLBIVAX_BCAST | MMU_FTR_LOCK_BCAST_INVAL | 171 #elif defined(CONFIG_44x) 172 MMU_FTR_TYPE_44x | 173 #endif 174 #ifdef CONFIG_E500 175 MMU_FTR_TYPE_FSL_E | MMU_FTR_BIG_PHYS | MMU_FTR_USE_TLBILX | 176 #endif 177 #ifdef CONFIG_PPC_BOOK3S_32 178 MMU_FTR_USE_HIGH_BATS | 179 #endif 180 #ifdef CONFIG_PPC_83xx 181 MMU_FTR_NEED_DTLB_SW_LRU | 182 #endif 183 #ifdef CONFIG_PPC_BOOK3E_64 184 MMU_FTR_USE_TLBRSRV | MMU_FTR_USE_PAIRED_MAS | 185 #endif 186 #ifdef CONFIG_PPC_BOOK3S_64 187 MMU_FTR_KERNEL_RO | 188 #ifdef CONFIG_PPC_64S_HASH_MMU 189 MMU_FTR_NO_SLBIE_B | MMU_FTR_16M_PAGE | MMU_FTR_TLBIEL | 190 MMU_FTR_LOCKLESS_TLBIE | MMU_FTR_CI_LARGE_PAGE | 191 MMU_FTR_1T_SEGMENT | MMU_FTR_TLBIE_CROP_VA | 192 MMU_FTR_68_BIT_VA | MMU_FTR_HPTE_TABLE | 193 #endif 194 #ifdef CONFIG_PPC_RADIX_MMU 195 MMU_FTR_TYPE_RADIX | 196 MMU_FTR_GTSE | 197 #endif /* CONFIG_PPC_RADIX_MMU */ 198 #endif 199 #ifdef CONFIG_PPC_KUAP 200 MMU_FTR_BOOK3S_KUAP | 201 #endif /* CONFIG_PPC_KUAP */ 202 #ifdef CONFIG_PPC_MEM_KEYS 203 MMU_FTR_PKEY | 204 #endif 205 #ifdef CONFIG_PPC_KUEP 206 MMU_FTR_BOOK3S_KUEP | 207 #endif /* CONFIG_PPC_KUAP */ 208 209 0, 210 }; 211 212 #if defined(CONFIG_PPC_BOOK3S_604) && !defined(CONFIG_PPC_BOOK3S_603) 213 #define MMU_FTRS_ALWAYS MMU_FTR_HPTE_TABLE 214 #endif 215 #ifdef CONFIG_PPC_8xx 216 #define MMU_FTRS_ALWAYS MMU_FTR_TYPE_8xx 217 #endif 218 #ifdef CONFIG_40x 219 #define MMU_FTRS_ALWAYS MMU_FTR_TYPE_40x 220 #endif 221 #ifdef CONFIG_PPC_47x 222 #define MMU_FTRS_ALWAYS MMU_FTR_TYPE_47x 223 #elif defined(CONFIG_44x) 224 #define MMU_FTRS_ALWAYS MMU_FTR_TYPE_44x 225 #endif 226 #ifdef CONFIG_E500 227 #define MMU_FTRS_ALWAYS MMU_FTR_TYPE_FSL_E 228 #endif 229 230 /* BOOK3S_64 options */ 231 #if defined(CONFIG_PPC_RADIX_MMU) && !defined(CONFIG_PPC_64S_HASH_MMU) 232 #define MMU_FTRS_ALWAYS MMU_FTR_TYPE_RADIX 233 #elif !defined(CONFIG_PPC_RADIX_MMU) && defined(CONFIG_PPC_64S_HASH_MMU) 234 #define MMU_FTRS_ALWAYS MMU_FTR_HPTE_TABLE 235 #endif 236 237 #ifndef MMU_FTRS_ALWAYS 238 #define MMU_FTRS_ALWAYS 0 239 #endif 240 241 static __always_inline bool early_mmu_has_feature(unsigned long feature) 242 { 243 if (MMU_FTRS_ALWAYS & feature) 244 return true; 245 246 return !!(MMU_FTRS_POSSIBLE & cur_cpu_spec->mmu_features & feature); 247 } 248 249 #ifdef CONFIG_JUMP_LABEL_FEATURE_CHECKS 250 #include <linux/jump_label.h> 251 252 #define NUM_MMU_FTR_KEYS 32 253 254 extern struct static_key_true mmu_feature_keys[NUM_MMU_FTR_KEYS]; 255 256 extern void mmu_feature_keys_init(void); 257 258 static __always_inline bool mmu_has_feature(unsigned long feature) 259 { 260 int i; 261 262 #ifndef __clang__ /* clang can't cope with this */ 263 BUILD_BUG_ON(!__builtin_constant_p(feature)); 264 #endif 265 266 #ifdef CONFIG_JUMP_LABEL_FEATURE_CHECK_DEBUG 267 if (!static_key_initialized) { 268 printk("Warning! mmu_has_feature() used prior to jump label init!\n"); 269 dump_stack(); 270 return early_mmu_has_feature(feature); 271 } 272 #endif 273 274 if (MMU_FTRS_ALWAYS & feature) 275 return true; 276 277 if (!(MMU_FTRS_POSSIBLE & feature)) 278 return false; 279 280 i = __builtin_ctzl(feature); 281 return static_branch_likely(&mmu_feature_keys[i]); 282 } 283 284 static inline void mmu_clear_feature(unsigned long feature) 285 { 286 int i; 287 288 i = __builtin_ctzl(feature); 289 cur_cpu_spec->mmu_features &= ~feature; 290 static_branch_disable(&mmu_feature_keys[i]); 291 } 292 #else 293 294 static inline void mmu_feature_keys_init(void) 295 { 296 297 } 298 299 static __always_inline bool mmu_has_feature(unsigned long feature) 300 { 301 return early_mmu_has_feature(feature); 302 } 303 304 static inline void mmu_clear_feature(unsigned long feature) 305 { 306 cur_cpu_spec->mmu_features &= ~feature; 307 } 308 #endif /* CONFIG_JUMP_LABEL */ 309 310 extern unsigned int __start___mmu_ftr_fixup, __stop___mmu_ftr_fixup; 311 312 #ifdef CONFIG_PPC64 313 /* This is our real memory area size on ppc64 server, on embedded, we 314 * make it match the size our of bolted TLB area 315 */ 316 extern u64 ppc64_rma_size; 317 318 /* Cleanup function used by kexec */ 319 extern void mmu_cleanup_all(void); 320 extern void radix__mmu_cleanup_all(void); 321 322 /* Functions for creating and updating partition table on POWER9 */ 323 extern void mmu_partition_table_init(void); 324 extern void mmu_partition_table_set_entry(unsigned int lpid, unsigned long dw0, 325 unsigned long dw1, bool flush); 326 #endif /* CONFIG_PPC64 */ 327 328 struct mm_struct; 329 #ifdef CONFIG_DEBUG_VM 330 extern void assert_pte_locked(struct mm_struct *mm, unsigned long addr); 331 #else /* CONFIG_DEBUG_VM */ 332 static inline void assert_pte_locked(struct mm_struct *mm, unsigned long addr) 333 { 334 } 335 #endif /* !CONFIG_DEBUG_VM */ 336 337 static __always_inline bool radix_enabled(void) 338 { 339 return mmu_has_feature(MMU_FTR_TYPE_RADIX); 340 } 341 342 static __always_inline bool early_radix_enabled(void) 343 { 344 return early_mmu_has_feature(MMU_FTR_TYPE_RADIX); 345 } 346 347 #ifdef CONFIG_STRICT_KERNEL_RWX 348 static inline bool strict_kernel_rwx_enabled(void) 349 { 350 return rodata_enabled; 351 } 352 #else 353 static inline bool strict_kernel_rwx_enabled(void) 354 { 355 return false; 356 } 357 #endif 358 359 static inline bool strict_module_rwx_enabled(void) 360 { 361 return IS_ENABLED(CONFIG_STRICT_MODULE_RWX) && strict_kernel_rwx_enabled(); 362 } 363 #endif /* !__ASSEMBLY__ */ 364 365 /* The kernel use the constants below to index in the page sizes array. 366 * The use of fixed constants for this purpose is better for performances 367 * of the low level hash refill handlers. 368 * 369 * A non supported page size has a "shift" field set to 0 370 * 371 * Any new page size being implemented can get a new entry in here. Whether 372 * the kernel will use it or not is a different matter though. The actual page 373 * size used by hugetlbfs is not defined here and may be made variable 374 * 375 * Note: This array ended up being a false good idea as it's growing to the 376 * point where I wonder if we should replace it with something different, 377 * to think about, feedback welcome. --BenH. 378 */ 379 380 /* These are #defines as they have to be used in assembly */ 381 #define MMU_PAGE_4K 0 382 #define MMU_PAGE_16K 1 383 #define MMU_PAGE_64K 2 384 #define MMU_PAGE_64K_AP 3 /* "Admixed pages" (hash64 only) */ 385 #define MMU_PAGE_256K 4 386 #define MMU_PAGE_512K 5 387 #define MMU_PAGE_1M 6 388 #define MMU_PAGE_2M 7 389 #define MMU_PAGE_4M 8 390 #define MMU_PAGE_8M 9 391 #define MMU_PAGE_16M 10 392 #define MMU_PAGE_64M 11 393 #define MMU_PAGE_256M 12 394 #define MMU_PAGE_1G 13 395 #define MMU_PAGE_16G 14 396 #define MMU_PAGE_64G 15 397 398 /* 399 * N.B. we need to change the type of hpte_page_sizes if this gets to be > 16 400 * Also we need to change he type of mm_context.low/high_slices_psize. 401 */ 402 #define MMU_PAGE_COUNT 16 403 404 #ifdef CONFIG_PPC_BOOK3S_64 405 #include <asm/book3s/64/mmu.h> 406 #else /* CONFIG_PPC_BOOK3S_64 */ 407 408 #ifndef __ASSEMBLY__ 409 /* MMU initialization */ 410 extern void early_init_mmu(void); 411 extern void early_init_mmu_secondary(void); 412 extern void setup_initial_memory_limit(phys_addr_t first_memblock_base, 413 phys_addr_t first_memblock_size); 414 static inline void mmu_early_init_devtree(void) { } 415 416 static inline void pkey_early_init_devtree(void) {} 417 418 extern void *abatron_pteptrs[2]; 419 #endif /* __ASSEMBLY__ */ 420 #endif 421 422 #if defined(CONFIG_PPC_BOOK3S_32) 423 /* 32-bit classic hash table MMU */ 424 #include <asm/book3s/32/mmu-hash.h> 425 #elif defined(CONFIG_PPC_MMU_NOHASH) 426 #include <asm/nohash/mmu.h> 427 #endif 428 429 #endif /* __KERNEL__ */ 430 #endif /* _ASM_POWERPC_MMU_H_ */ 431