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 /* Doesn't support the B bit (1T segment) in SLBIE 100 */ 101 #define MMU_FTR_NO_SLBIE_B ASM_CONST(0x02000000) 102 103 /* Support 16M large pages 104 */ 105 #define MMU_FTR_16M_PAGE ASM_CONST(0x04000000) 106 107 /* Supports TLBIEL variant 108 */ 109 #define MMU_FTR_TLBIEL ASM_CONST(0x08000000) 110 111 /* Supports tlbies w/o locking 112 */ 113 #define MMU_FTR_LOCKLESS_TLBIE ASM_CONST(0x10000000) 114 115 /* Large pages can be marked CI 116 */ 117 #define MMU_FTR_CI_LARGE_PAGE ASM_CONST(0x20000000) 118 119 /* 1T segments available 120 */ 121 #define MMU_FTR_1T_SEGMENT ASM_CONST(0x40000000) 122 123 // NX paste RMA reject in DSI 124 #define MMU_FTR_NX_DSI ASM_CONST(0x80000000) 125 126 /* MMU feature bit sets for various CPUs */ 127 #define MMU_FTRS_DEFAULT_HPTE_ARCH_V2 (MMU_FTR_HPTE_TABLE | MMU_FTR_TLBIEL | MMU_FTR_16M_PAGE) 128 #define MMU_FTRS_POWER MMU_FTRS_DEFAULT_HPTE_ARCH_V2 129 #define MMU_FTRS_PPC970 MMU_FTRS_POWER | MMU_FTR_TLBIE_CROP_VA 130 #define MMU_FTRS_POWER5 MMU_FTRS_POWER | MMU_FTR_LOCKLESS_TLBIE 131 #define MMU_FTRS_POWER6 MMU_FTRS_POWER5 | MMU_FTR_KERNEL_RO | MMU_FTR_68_BIT_VA 132 #define MMU_FTRS_POWER7 MMU_FTRS_POWER6 133 #define MMU_FTRS_POWER8 MMU_FTRS_POWER6 134 #define MMU_FTRS_POWER9 MMU_FTRS_POWER6 135 #define MMU_FTRS_POWER10 MMU_FTRS_POWER6 136 #define MMU_FTRS_CELL MMU_FTRS_DEFAULT_HPTE_ARCH_V2 | \ 137 MMU_FTR_CI_LARGE_PAGE 138 #define MMU_FTRS_PA6T MMU_FTRS_DEFAULT_HPTE_ARCH_V2 | \ 139 MMU_FTR_CI_LARGE_PAGE | MMU_FTR_NO_SLBIE_B 140 #ifndef __ASSEMBLY__ 141 #include <linux/bug.h> 142 #include <asm/cputable.h> 143 #include <asm/page.h> 144 145 typedef pte_t *pgtable_t; 146 147 #ifdef CONFIG_PPC_E500 148 #include <asm/percpu.h> 149 DECLARE_PER_CPU(int, next_tlbcam_idx); 150 #endif 151 152 enum { 153 MMU_FTRS_POSSIBLE = 154 #if defined(CONFIG_PPC_BOOK3S_604) 155 MMU_FTR_HPTE_TABLE | 156 #endif 157 #ifdef CONFIG_PPC_8xx 158 MMU_FTR_TYPE_8xx | 159 #endif 160 #ifdef CONFIG_40x 161 MMU_FTR_TYPE_40x | 162 #endif 163 #ifdef CONFIG_PPC_47x 164 MMU_FTR_TYPE_47x | MMU_FTR_USE_TLBIVAX_BCAST | MMU_FTR_LOCK_BCAST_INVAL | 165 #elif defined(CONFIG_44x) 166 MMU_FTR_TYPE_44x | 167 #endif 168 #ifdef CONFIG_PPC_E500 169 MMU_FTR_TYPE_FSL_E | MMU_FTR_BIG_PHYS | MMU_FTR_USE_TLBILX | 170 #endif 171 #ifdef CONFIG_PPC_BOOK3S_32 172 MMU_FTR_USE_HIGH_BATS | 173 #endif 174 #ifdef CONFIG_PPC_83xx 175 MMU_FTR_NEED_DTLB_SW_LRU | 176 #endif 177 #ifdef CONFIG_PPC_BOOK3S_64 178 MMU_FTR_KERNEL_RO | 179 #ifdef CONFIG_PPC_64S_HASH_MMU 180 MMU_FTR_NO_SLBIE_B | MMU_FTR_16M_PAGE | MMU_FTR_TLBIEL | 181 MMU_FTR_LOCKLESS_TLBIE | MMU_FTR_CI_LARGE_PAGE | 182 MMU_FTR_1T_SEGMENT | MMU_FTR_TLBIE_CROP_VA | 183 MMU_FTR_68_BIT_VA | MMU_FTR_HPTE_TABLE | 184 #endif 185 #ifdef CONFIG_PPC_RADIX_MMU 186 MMU_FTR_TYPE_RADIX | 187 MMU_FTR_GTSE | MMU_FTR_NX_DSI | 188 #endif /* CONFIG_PPC_RADIX_MMU */ 189 #endif 190 #ifdef CONFIG_PPC_KUAP 191 MMU_FTR_BOOK3S_KUAP | 192 #endif /* CONFIG_PPC_KUAP */ 193 #ifdef CONFIG_PPC_MEM_KEYS 194 MMU_FTR_PKEY | 195 #endif 196 #ifdef CONFIG_PPC_KUEP 197 MMU_FTR_BOOK3S_KUEP | 198 #endif /* CONFIG_PPC_KUAP */ 199 200 0, 201 }; 202 203 #if defined(CONFIG_PPC_BOOK3S_604) && !defined(CONFIG_PPC_BOOK3S_603) 204 #define MMU_FTRS_ALWAYS MMU_FTR_HPTE_TABLE 205 #endif 206 #ifdef CONFIG_PPC_8xx 207 #define MMU_FTRS_ALWAYS MMU_FTR_TYPE_8xx 208 #endif 209 #ifdef CONFIG_40x 210 #define MMU_FTRS_ALWAYS MMU_FTR_TYPE_40x 211 #endif 212 #ifdef CONFIG_PPC_47x 213 #define MMU_FTRS_ALWAYS MMU_FTR_TYPE_47x 214 #elif defined(CONFIG_44x) 215 #define MMU_FTRS_ALWAYS MMU_FTR_TYPE_44x 216 #endif 217 #ifdef CONFIG_PPC_E500 218 #define MMU_FTRS_ALWAYS MMU_FTR_TYPE_FSL_E 219 #endif 220 221 /* BOOK3S_64 options */ 222 #if defined(CONFIG_PPC_RADIX_MMU) && !defined(CONFIG_PPC_64S_HASH_MMU) 223 #define MMU_FTRS_ALWAYS MMU_FTR_TYPE_RADIX 224 #elif !defined(CONFIG_PPC_RADIX_MMU) && defined(CONFIG_PPC_64S_HASH_MMU) 225 #define MMU_FTRS_ALWAYS MMU_FTR_HPTE_TABLE 226 #endif 227 228 #ifndef MMU_FTRS_ALWAYS 229 #define MMU_FTRS_ALWAYS 0 230 #endif 231 232 static __always_inline bool early_mmu_has_feature(unsigned long feature) 233 { 234 if (MMU_FTRS_ALWAYS & feature) 235 return true; 236 237 return !!(MMU_FTRS_POSSIBLE & cur_cpu_spec->mmu_features & feature); 238 } 239 240 #ifdef CONFIG_JUMP_LABEL_FEATURE_CHECKS 241 #include <linux/jump_label.h> 242 243 #define NUM_MMU_FTR_KEYS 32 244 245 extern struct static_key_true mmu_feature_keys[NUM_MMU_FTR_KEYS]; 246 247 extern void mmu_feature_keys_init(void); 248 249 static __always_inline bool mmu_has_feature(unsigned long feature) 250 { 251 int i; 252 253 #ifndef __clang__ /* clang can't cope with this */ 254 BUILD_BUG_ON(!__builtin_constant_p(feature)); 255 #endif 256 257 #ifdef CONFIG_JUMP_LABEL_FEATURE_CHECK_DEBUG 258 if (!static_key_initialized) { 259 printk("Warning! mmu_has_feature() used prior to jump label init!\n"); 260 dump_stack(); 261 return early_mmu_has_feature(feature); 262 } 263 #endif 264 265 if (MMU_FTRS_ALWAYS & feature) 266 return true; 267 268 if (!(MMU_FTRS_POSSIBLE & feature)) 269 return false; 270 271 i = __builtin_ctzl(feature); 272 return static_branch_likely(&mmu_feature_keys[i]); 273 } 274 275 static inline void mmu_clear_feature(unsigned long feature) 276 { 277 int i; 278 279 i = __builtin_ctzl(feature); 280 cur_cpu_spec->mmu_features &= ~feature; 281 static_branch_disable(&mmu_feature_keys[i]); 282 } 283 #else 284 285 static inline void mmu_feature_keys_init(void) 286 { 287 288 } 289 290 static __always_inline bool mmu_has_feature(unsigned long feature) 291 { 292 return early_mmu_has_feature(feature); 293 } 294 295 static inline void mmu_clear_feature(unsigned long feature) 296 { 297 cur_cpu_spec->mmu_features &= ~feature; 298 } 299 #endif /* CONFIG_JUMP_LABEL */ 300 301 extern unsigned int __start___mmu_ftr_fixup, __stop___mmu_ftr_fixup; 302 303 #ifdef CONFIG_PPC64 304 /* This is our real memory area size on ppc64 server, on embedded, we 305 * make it match the size our of bolted TLB area 306 */ 307 extern u64 ppc64_rma_size; 308 309 /* Cleanup function used by kexec */ 310 extern void mmu_cleanup_all(void); 311 extern void radix__mmu_cleanup_all(void); 312 313 /* Functions for creating and updating partition table on POWER9 */ 314 extern void mmu_partition_table_init(void); 315 extern void mmu_partition_table_set_entry(unsigned int lpid, unsigned long dw0, 316 unsigned long dw1, bool flush); 317 #endif /* CONFIG_PPC64 */ 318 319 struct mm_struct; 320 #ifdef CONFIG_DEBUG_VM 321 extern void assert_pte_locked(struct mm_struct *mm, unsigned long addr); 322 #else /* CONFIG_DEBUG_VM */ 323 static inline void assert_pte_locked(struct mm_struct *mm, unsigned long addr) 324 { 325 } 326 #endif /* !CONFIG_DEBUG_VM */ 327 328 static __always_inline bool radix_enabled(void) 329 { 330 return mmu_has_feature(MMU_FTR_TYPE_RADIX); 331 } 332 333 static __always_inline bool early_radix_enabled(void) 334 { 335 return early_mmu_has_feature(MMU_FTR_TYPE_RADIX); 336 } 337 338 #ifdef CONFIG_STRICT_KERNEL_RWX 339 static inline bool strict_kernel_rwx_enabled(void) 340 { 341 return rodata_enabled; 342 } 343 #else 344 static inline bool strict_kernel_rwx_enabled(void) 345 { 346 return false; 347 } 348 #endif 349 350 static inline bool strict_module_rwx_enabled(void) 351 { 352 return IS_ENABLED(CONFIG_STRICT_MODULE_RWX) && strict_kernel_rwx_enabled(); 353 } 354 #endif /* !__ASSEMBLY__ */ 355 356 /* The kernel use the constants below to index in the page sizes array. 357 * The use of fixed constants for this purpose is better for performances 358 * of the low level hash refill handlers. 359 * 360 * A non supported page size has a "shift" field set to 0 361 * 362 * Any new page size being implemented can get a new entry in here. Whether 363 * the kernel will use it or not is a different matter though. The actual page 364 * size used by hugetlbfs is not defined here and may be made variable 365 * 366 * Note: This array ended up being a false good idea as it's growing to the 367 * point where I wonder if we should replace it with something different, 368 * to think about, feedback welcome. --BenH. 369 */ 370 371 /* These are #defines as they have to be used in assembly */ 372 #define MMU_PAGE_4K 0 373 #define MMU_PAGE_16K 1 374 #define MMU_PAGE_64K 2 375 #define MMU_PAGE_64K_AP 3 /* "Admixed pages" (hash64 only) */ 376 #define MMU_PAGE_256K 4 377 #define MMU_PAGE_512K 5 378 #define MMU_PAGE_1M 6 379 #define MMU_PAGE_2M 7 380 #define MMU_PAGE_4M 8 381 #define MMU_PAGE_8M 9 382 #define MMU_PAGE_16M 10 383 #define MMU_PAGE_64M 11 384 #define MMU_PAGE_256M 12 385 #define MMU_PAGE_1G 13 386 #define MMU_PAGE_16G 14 387 #define MMU_PAGE_64G 15 388 389 /* 390 * N.B. we need to change the type of hpte_page_sizes if this gets to be > 16 391 * Also we need to change he type of mm_context.low/high_slices_psize. 392 */ 393 #define MMU_PAGE_COUNT 16 394 395 #ifdef CONFIG_PPC_BOOK3S_64 396 #include <asm/book3s/64/mmu.h> 397 #else /* CONFIG_PPC_BOOK3S_64 */ 398 399 #ifndef __ASSEMBLY__ 400 /* MMU initialization */ 401 extern void early_init_mmu(void); 402 extern void early_init_mmu_secondary(void); 403 extern void setup_initial_memory_limit(phys_addr_t first_memblock_base, 404 phys_addr_t first_memblock_size); 405 static inline void mmu_early_init_devtree(void) { } 406 407 static inline void pkey_early_init_devtree(void) {} 408 409 extern void *abatron_pteptrs[2]; 410 #endif /* __ASSEMBLY__ */ 411 #endif 412 413 #if defined(CONFIG_PPC_BOOK3S_32) 414 /* 32-bit classic hash table MMU */ 415 #include <asm/book3s/32/mmu-hash.h> 416 #elif defined(CONFIG_PPC_MMU_NOHASH) 417 #include <asm/nohash/mmu.h> 418 #endif 419 420 #endif /* __KERNEL__ */ 421 #endif /* _ASM_POWERPC_MMU_H_ */ 422