arch/powerpc/include/asm/mmu.h

   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  * Support for 68 bit VA space. We added that from ISA 2.05
  33  */
  34 #define MMU_FTR_68_BIT_VA               ASM_CONST(0x00002000)
  35 /*
  36  * Kernel read only support.
  37  * We added the ppp value 0b110 in ISA 2.04.
  38  */
  39 #define MMU_FTR_KERNEL_RO               ASM_CONST(0x00004000)
  40
  41 /*
  42  * We need to clear top 16bits of va (from the remaining 64 bits )in
  43  * tlbie* instructions
  44  */
  45 #define MMU_FTR_TLBIE_CROP_VA           ASM_CONST(0x00008000)
  46
  47 /* Enable use of high BAT registers */
  48 #define MMU_FTR_USE_HIGH_BATS           ASM_CONST(0x00010000)
  49
  50 /* Enable >32-bit physical addresses on 32-bit processor, only used
  51  * by CONFIG_PPC_BOOK3S_32 currently as BookE supports that from day 1
  52  */
  53 #define MMU_FTR_BIG_PHYS                ASM_CONST(0x00020000)
  54
  55 /* Enable use of broadcast TLB invalidations. We don't always set it
  56  * on processors that support it due to other constraints with the
  57  * use of such invalidations
  58  */
  59 #define MMU_FTR_USE_TLBIVAX_BCAST       ASM_CONST(0x00040000)
  60
  61 /* Enable use of tlbilx invalidate instructions.
  62  */
  63 #define MMU_FTR_USE_TLBILX              ASM_CONST(0x00080000)
  64
  65 /* This indicates that the processor cannot handle multiple outstanding
  66  * broadcast tlbivax or tlbsync. This makes the code use a spinlock
  67  * around such invalidate forms.
  68  */
  69 #define MMU_FTR_LOCK_BCAST_INVAL        ASM_CONST(0x00100000)
  70
  71 /* This indicates that the processor doesn't handle way selection
  72  * properly and needs SW to track and update the LRU state.  This
  73  * is specific to an errata on e300c2/c3/c4 class parts
  74  */
  75 #define MMU_FTR_NEED_DTLB_SW_LRU        ASM_CONST(0x00200000)
  76
  77 /* Enable use of TLB reservation.  Processor should support tlbsrx.
  78  * instruction and MAS0[WQ].
  79  */
  80 #define MMU_FTR_USE_TLBRSRV             ASM_CONST(0x00800000)
  81
  82 /* Use paired MAS registers (MAS7||MAS3, etc.)
  83  */
  84 #define MMU_FTR_USE_PAIRED_MAS          ASM_CONST(0x01000000)
  85
  86 /* Doesn't support the B bit (1T segment) in SLBIE
  87  */
  88 #define MMU_FTR_NO_SLBIE_B              ASM_CONST(0x02000000)
  89
  90 /* Support 16M large pages
  91  */
  92 #define MMU_FTR_16M_PAGE                ASM_CONST(0x04000000)
  93
  94 /* Supports TLBIEL variant
  95  */
  96 #define MMU_FTR_TLBIEL                  ASM_CONST(0x08000000)
  97
  98 /* Supports tlbies w/o locking
  99  */
 100 #define MMU_FTR_LOCKLESS_TLBIE          ASM_CONST(0x10000000)
 101
 102 /* Large pages can be marked CI
 103  */
 104 #define MMU_FTR_CI_LARGE_PAGE           ASM_CONST(0x20000000)
 105
 106 /* 1T segments available
 107  */
 108 #define MMU_FTR_1T_SEGMENT              ASM_CONST(0x40000000)
 109
 110 /*
 111  * Supports KUAP (key 0 controlling userspace addresses) on radix
 112  */
 113 #define MMU_FTR_RADIX_KUAP              ASM_CONST(0x80000000)
 114
 115 /* MMU feature bit sets for various CPUs */
 116 #define MMU_FTRS_DEFAULT_HPTE_ARCH_V2   \
 117         MMU_FTR_HPTE_TABLE | MMU_FTR_PPCAS_ARCH_V2
 118 #define MMU_FTRS_POWER          MMU_FTRS_DEFAULT_HPTE_ARCH_V2
 119 #define MMU_FTRS_PPC970         MMU_FTRS_POWER | MMU_FTR_TLBIE_CROP_VA
 120 #define MMU_FTRS_POWER5         MMU_FTRS_POWER | MMU_FTR_LOCKLESS_TLBIE
 121 #define MMU_FTRS_POWER6         MMU_FTRS_POWER5 | MMU_FTR_KERNEL_RO | MMU_FTR_68_BIT_VA
 122 #define MMU_FTRS_POWER7         MMU_FTRS_POWER6
 123 #define MMU_FTRS_POWER8         MMU_FTRS_POWER6
 124 #define MMU_FTRS_POWER9         MMU_FTRS_POWER6
 125 #define MMU_FTRS_CELL           MMU_FTRS_DEFAULT_HPTE_ARCH_V2 | \
 126                                 MMU_FTR_CI_LARGE_PAGE
 127 #define MMU_FTRS_PA6T           MMU_FTRS_DEFAULT_HPTE_ARCH_V2 | \
 128                                 MMU_FTR_CI_LARGE_PAGE | MMU_FTR_NO_SLBIE_B
 129 #ifndef __ASSEMBLY__
 130 #include <linux/bug.h>
 131 #include <asm/cputable.h>
 132 #include <asm/page.h>
 133
 134 typedef pte_t *pgtable_t;
 135
 136 #ifdef CONFIG_PPC_FSL_BOOK3E
 137 #include <asm/percpu.h>
 138 DECLARE_PER_CPU(int, next_tlbcam_idx);
 139 #endif
 140
 141 enum {
 142         MMU_FTRS_POSSIBLE =
 143 #ifdef CONFIG_PPC_BOOK3S
 144                 MMU_FTR_HPTE_TABLE |
 145 #endif
 146 #ifdef CONFIG_PPC_8xx
 147                 MMU_FTR_TYPE_8xx |
 148 #endif
 149 #ifdef CONFIG_40x
 150                 MMU_FTR_TYPE_40x |
 151 #endif
 152 #ifdef CONFIG_44x
 153                 MMU_FTR_TYPE_44x |
 154 #endif
 155 #if defined(CONFIG_E200) || defined(CONFIG_E500)
 156                 MMU_FTR_TYPE_FSL_E | MMU_FTR_BIG_PHYS | MMU_FTR_USE_TLBILX |
 157 #endif
 158 #ifdef CONFIG_PPC_47x
 159                 MMU_FTR_TYPE_47x | MMU_FTR_USE_TLBIVAX_BCAST | MMU_FTR_LOCK_BCAST_INVAL |
 160 #endif
 161 #ifdef CONFIG_PPC_BOOK3S_32
 162                 MMU_FTR_USE_HIGH_BATS | MMU_FTR_NEED_DTLB_SW_LRU |
 163 #endif
 164 #ifdef CONFIG_PPC_BOOK3E_64
 165                 MMU_FTR_USE_TLBRSRV | MMU_FTR_USE_PAIRED_MAS |
 166 #endif
 167 #ifdef CONFIG_PPC_BOOK3S_64
 168                 MMU_FTR_NO_SLBIE_B | MMU_FTR_16M_PAGE | MMU_FTR_TLBIEL |
 169                 MMU_FTR_LOCKLESS_TLBIE | MMU_FTR_CI_LARGE_PAGE |
 170                 MMU_FTR_1T_SEGMENT | MMU_FTR_TLBIE_CROP_VA |
 171                 MMU_FTR_KERNEL_RO | MMU_FTR_68_BIT_VA |
 172 #endif
 173 #ifdef CONFIG_PPC_RADIX_MMU
 174                 MMU_FTR_TYPE_RADIX |
 175 #ifdef CONFIG_PPC_KUAP
 176                 MMU_FTR_RADIX_KUAP |
 177 #endif /* CONFIG_PPC_KUAP */
 178 #endif /* CONFIG_PPC_RADIX_MMU */
 179                 0,
 180 };
 181
 182 static inline bool early_mmu_has_feature(unsigned long feature)
 183 {
 184         return !!(MMU_FTRS_POSSIBLE & cur_cpu_spec->mmu_features & feature);
 185 }
 186
 187 #ifdef CONFIG_JUMP_LABEL_FEATURE_CHECKS
 188 #include <linux/jump_label.h>
 189
 190 #define NUM_MMU_FTR_KEYS        32
 191
 192 extern struct static_key_true mmu_feature_keys[NUM_MMU_FTR_KEYS];
 193
 194 extern void mmu_feature_keys_init(void);
 195
 196 static __always_inline bool mmu_has_feature(unsigned long feature)
 197 {
 198         int i;
 199
 200 #ifndef __clang__ /* clang can't cope with this */
 201         BUILD_BUG_ON(!__builtin_constant_p(feature));
 202 #endif
 203
 204 #ifdef CONFIG_JUMP_LABEL_FEATURE_CHECK_DEBUG
 205         if (!static_key_initialized) {
 206                 printk("Warning! mmu_has_feature() used prior to jump label init!\n");
 207                 dump_stack();
 208                 return early_mmu_has_feature(feature);
 209         }
 210 #endif
 211
 212         if (!(MMU_FTRS_POSSIBLE & feature))
 213                 return false;
 214
 215         i = __builtin_ctzl(feature);
 216         return static_branch_likely(&mmu_feature_keys[i]);
 217 }
 218
 219 static inline void mmu_clear_feature(unsigned long feature)
 220 {
 221         int i;
 222
 223         i = __builtin_ctzl(feature);
 224         cur_cpu_spec->mmu_features &= ~feature;
 225         static_branch_disable(&mmu_feature_keys[i]);
 226 }
 227 #else
 228
 229 static inline void mmu_feature_keys_init(void)
 230 {
 231
 232 }
 233
 234 static inline bool mmu_has_feature(unsigned long feature)
 235 {
 236         return early_mmu_has_feature(feature);
 237 }
 238
 239 static inline void mmu_clear_feature(unsigned long feature)
 240 {
 241         cur_cpu_spec->mmu_features &= ~feature;
 242 }
 243 #endif /* CONFIG_JUMP_LABEL */
 244
 245 extern unsigned int __start___mmu_ftr_fixup, __stop___mmu_ftr_fixup;
 246
 247 #ifdef CONFIG_PPC64
 248 /* This is our real memory area size on ppc64 server, on embedded, we
 249  * make it match the size our of bolted TLB area
 250  */
 251 extern u64 ppc64_rma_size;
 252
 253 /* Cleanup function used by kexec */
 254 extern void mmu_cleanup_all(void);
 255 extern void radix__mmu_cleanup_all(void);
 256
 257 /* Functions for creating and updating partition table on POWER9 */
 258 extern void mmu_partition_table_init(void);
 259 extern void mmu_partition_table_set_entry(unsigned int lpid, unsigned long dw0,
 260                                           unsigned long dw1);
 261 #endif /* CONFIG_PPC64 */
 262
 263 struct mm_struct;
 264 #ifdef CONFIG_DEBUG_VM
 265 extern void assert_pte_locked(struct mm_struct *mm, unsigned long addr);
 266 #else /* CONFIG_DEBUG_VM */
 267 static inline void assert_pte_locked(struct mm_struct *mm, unsigned long addr)
 268 {
 269 }
 270 #endif /* !CONFIG_DEBUG_VM */
 271
 272 #ifdef CONFIG_PPC_RADIX_MMU
 273 static inline bool radix_enabled(void)
 274 {
 275         return mmu_has_feature(MMU_FTR_TYPE_RADIX);
 276 }
 277
 278 static inline bool early_radix_enabled(void)
 279 {
 280         return early_mmu_has_feature(MMU_FTR_TYPE_RADIX);
 281 }
 282 #else
 283 static inline bool radix_enabled(void)
 284 {
 285         return false;
 286 }
 287
 288 static inline bool early_radix_enabled(void)
 289 {
 290         return false;
 291 }
 292 #endif
 293
 294 #ifdef CONFIG_PPC_MEM_KEYS
 295 extern u16 get_mm_addr_key(struct mm_struct *mm, unsigned long address);
 296 #else
 297 static inline u16 get_mm_addr_key(struct mm_struct *mm, unsigned long address)
 298 {
 299         return 0;
 300 }
 301 #endif /* CONFIG_PPC_MEM_KEYS */
 302
 303 #ifdef CONFIG_STRICT_KERNEL_RWX
 304 static inline bool strict_kernel_rwx_enabled(void)
 305 {
 306         return rodata_enabled;
 307 }
 308 #else
 309 static inline bool strict_kernel_rwx_enabled(void)
 310 {
 311         return false;
 312 }
 313 #endif
 314 #endif /* !__ASSEMBLY__ */
 315
 316 /* The kernel use the constants below to index in the page sizes array.
 317  * The use of fixed constants for this purpose is better for performances
 318  * of the low level hash refill handlers.
 319  *
 320  * A non supported page size has a "shift" field set to 0
 321  *
 322  * Any new page size being implemented can get a new entry in here. Whether
 323  * the kernel will use it or not is a different matter though. The actual page
 324  * size used by hugetlbfs is not defined here and may be made variable
 325  *
 326  * Note: This array ended up being a false good idea as it's growing to the
 327  * point where I wonder if we should replace it with something different,
 328  * to think about, feedback welcome. --BenH.
 329  */
 330
 331 /* These are #defines as they have to be used in assembly */
 332 #define MMU_PAGE_4K     0
 333 #define MMU_PAGE_16K    1
 334 #define MMU_PAGE_64K    2
 335 #define MMU_PAGE_64K_AP 3       /* "Admixed pages" (hash64 only) */
 336 #define MMU_PAGE_256K   4
 337 #define MMU_PAGE_512K   5
 338 #define MMU_PAGE_1M     6
 339 #define MMU_PAGE_2M     7
 340 #define MMU_PAGE_4M     8
 341 #define MMU_PAGE_8M     9
 342 #define MMU_PAGE_16M    10
 343 #define MMU_PAGE_64M    11
 344 #define MMU_PAGE_256M   12
 345 #define MMU_PAGE_1G     13
 346 #define MMU_PAGE_16G    14
 347 #define MMU_PAGE_64G    15
 348
 349 /*
 350  * N.B. we need to change the type of hpte_page_sizes if this gets to be > 16
 351  * Also we need to change he type of mm_context.low/high_slices_psize.
 352  */
 353 #define MMU_PAGE_COUNT  16
 354
 355 #ifdef CONFIG_PPC_BOOK3S_64
 356 #include <asm/book3s/64/mmu.h>
 357 #else /* CONFIG_PPC_BOOK3S_64 */
 358
 359 #ifndef __ASSEMBLY__
 360 /* MMU initialization */
 361 extern void early_init_mmu(void);
 362 extern void early_init_mmu_secondary(void);
 363 extern void setup_initial_memory_limit(phys_addr_t first_memblock_base,
 364                                        phys_addr_t first_memblock_size);
 365 static inline void mmu_early_init_devtree(void) { }
 366
 367 extern void *abatron_pteptrs[2];
 368 #endif /* __ASSEMBLY__ */
 369 #endif
 370
 371 #if defined(CONFIG_PPC_BOOK3S_32)
 372 /* 32-bit classic hash table MMU */
 373 #include <asm/book3s/32/mmu-hash.h>
 374 #elif defined(CONFIG_PPC_MMU_NOHASH)
 375 #include <asm/nohash/mmu.h>
 376 #endif
 377
 378 #endif /* __KERNEL__ */
 379 #endif /* _ASM_POWERPC_MMU_H_ */