arch/powerpc/include/asm/mmu.h

   1 #ifndef _ASM_POWERPC_MMU_H_
   2 #define _ASM_POWERPC_MMU_H_
   3 #ifdef __KERNEL__
   4
   5 #include <linux/types.h>
   6
   7 #include <asm/asm-compat.h>
   8 #include <asm/feature-fixups.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  * Kernel read only support.
  33  * We added the ppp value 0b110 in ISA 2.04.
  34  */
  35 #define MMU_FTR_KERNEL_RO               ASM_CONST(0x00004000)
  36
  37 /*
  38  * We need to clear top 16bits of va (from the remaining 64 bits )in
  39  * tlbie* instructions
  40  */
  41 #define MMU_FTR_TLBIE_CROP_VA           ASM_CONST(0x00008000)
  42
  43 /* Enable use of high BAT registers */
  44 #define MMU_FTR_USE_HIGH_BATS           ASM_CONST(0x00010000)
  45
  46 /* Enable >32-bit physical addresses on 32-bit processor, only used
  47  * by CONFIG_6xx currently as BookE supports that from day 1
  48  */
  49 #define MMU_FTR_BIG_PHYS                ASM_CONST(0x00020000)
  50
  51 /* Enable use of broadcast TLB invalidations. We don't always set it
  52  * on processors that support it due to other constraints with the
  53  * use of such invalidations
  54  */
  55 #define MMU_FTR_USE_TLBIVAX_BCAST       ASM_CONST(0x00040000)
  56
  57 /* Enable use of tlbilx invalidate instructions.
  58  */
  59 #define MMU_FTR_USE_TLBILX              ASM_CONST(0x00080000)
  60
  61 /* This indicates that the processor cannot handle multiple outstanding
  62  * broadcast tlbivax or tlbsync. This makes the code use a spinlock
  63  * around such invalidate forms.
  64  */
  65 #define MMU_FTR_LOCK_BCAST_INVAL        ASM_CONST(0x00100000)
  66
  67 /* This indicates that the processor doesn't handle way selection
  68  * properly and needs SW to track and update the LRU state.  This
  69  * is specific to an errata on e300c2/c3/c4 class parts
  70  */
  71 #define MMU_FTR_NEED_DTLB_SW_LRU        ASM_CONST(0x00200000)
  72
  73 /* Enable use of TLB reservation.  Processor should support tlbsrx.
  74  * instruction and MAS0[WQ].
  75  */
  76 #define MMU_FTR_USE_TLBRSRV             ASM_CONST(0x00800000)
  77
  78 /* Use paired MAS registers (MAS7||MAS3, etc.)
  79  */
  80 #define MMU_FTR_USE_PAIRED_MAS          ASM_CONST(0x01000000)
  81
  82 /* Doesn't support the B bit (1T segment) in SLBIE
  83  */
  84 #define MMU_FTR_NO_SLBIE_B              ASM_CONST(0x02000000)
  85
  86 /* Support 16M large pages
  87  */
  88 #define MMU_FTR_16M_PAGE                ASM_CONST(0x04000000)
  89
  90 /* Supports TLBIEL variant
  91  */
  92 #define MMU_FTR_TLBIEL                  ASM_CONST(0x08000000)
  93
  94 /* Supports tlbies w/o locking
  95  */
  96 #define MMU_FTR_LOCKLESS_TLBIE          ASM_CONST(0x10000000)
  97
  98 /* Large pages can be marked CI
  99  */
 100 #define MMU_FTR_CI_LARGE_PAGE           ASM_CONST(0x20000000)
 101
 102 /* 1T segments available
 103  */
 104 #define MMU_FTR_1T_SEGMENT              ASM_CONST(0x40000000)
 105
 106 /* MMU feature bit sets for various CPUs */
 107 #define MMU_FTRS_DEFAULT_HPTE_ARCH_V2   \
 108         MMU_FTR_HPTE_TABLE | MMU_FTR_PPCAS_ARCH_V2
 109 #define MMU_FTRS_POWER4         MMU_FTRS_DEFAULT_HPTE_ARCH_V2
 110 #define MMU_FTRS_PPC970         MMU_FTRS_POWER4 | MMU_FTR_TLBIE_CROP_VA
 111 #define MMU_FTRS_POWER5         MMU_FTRS_POWER4 | MMU_FTR_LOCKLESS_TLBIE
 112 #define MMU_FTRS_POWER6         MMU_FTRS_POWER4 | MMU_FTR_LOCKLESS_TLBIE | MMU_FTR_KERNEL_RO
 113 #define MMU_FTRS_POWER7         MMU_FTRS_POWER4 | MMU_FTR_LOCKLESS_TLBIE | MMU_FTR_KERNEL_RO
 114 #define MMU_FTRS_POWER8         MMU_FTRS_POWER4 | MMU_FTR_LOCKLESS_TLBIE | MMU_FTR_KERNEL_RO
 115 #define MMU_FTRS_POWER9         MMU_FTRS_POWER4 | MMU_FTR_LOCKLESS_TLBIE | MMU_FTR_KERNEL_RO
 116 #define MMU_FTRS_CELL           MMU_FTRS_DEFAULT_HPTE_ARCH_V2 | \
 117                                 MMU_FTR_CI_LARGE_PAGE
 118 #define MMU_FTRS_PA6T           MMU_FTRS_DEFAULT_HPTE_ARCH_V2 | \
 119                                 MMU_FTR_CI_LARGE_PAGE | MMU_FTR_NO_SLBIE_B
 120 #ifndef __ASSEMBLY__
 121 #include <linux/bug.h>
 122 #include <asm/cputable.h>
 123
 124 #ifdef CONFIG_PPC_FSL_BOOK3E
 125 #include <asm/percpu.h>
 126 DECLARE_PER_CPU(int, next_tlbcam_idx);
 127 #endif
 128
 129 enum {
 130         MMU_FTRS_POSSIBLE = MMU_FTR_HPTE_TABLE | MMU_FTR_TYPE_8xx |
 131                 MMU_FTR_TYPE_40x | MMU_FTR_TYPE_44x | MMU_FTR_TYPE_FSL_E |
 132                 MMU_FTR_TYPE_47x | MMU_FTR_USE_HIGH_BATS | MMU_FTR_BIG_PHYS |
 133                 MMU_FTR_USE_TLBIVAX_BCAST | MMU_FTR_USE_TLBILX |
 134                 MMU_FTR_LOCK_BCAST_INVAL | MMU_FTR_NEED_DTLB_SW_LRU |
 135                 MMU_FTR_USE_TLBRSRV | MMU_FTR_USE_PAIRED_MAS |
 136                 MMU_FTR_NO_SLBIE_B | MMU_FTR_16M_PAGE | MMU_FTR_TLBIEL |
 137                 MMU_FTR_LOCKLESS_TLBIE | MMU_FTR_CI_LARGE_PAGE |
 138                 MMU_FTR_1T_SEGMENT | MMU_FTR_TLBIE_CROP_VA |
 139 #ifdef CONFIG_PPC_RADIX_MMU
 140                 MMU_FTR_TYPE_RADIX |
 141 #endif
 142                 0,
 143 };
 144
 145 static inline bool early_mmu_has_feature(unsigned long feature)
 146 {
 147         return !!(MMU_FTRS_POSSIBLE & cur_cpu_spec->mmu_features & feature);
 148 }
 149
 150 #ifdef CONFIG_JUMP_LABEL_FEATURE_CHECKS
 151 #include <linux/jump_label.h>
 152
 153 #define NUM_MMU_FTR_KEYS        32
 154
 155 extern struct static_key_true mmu_feature_keys[NUM_MMU_FTR_KEYS];
 156
 157 extern void mmu_feature_keys_init(void);
 158
 159 static __always_inline bool mmu_has_feature(unsigned long feature)
 160 {
 161         int i;
 162
 163         BUILD_BUG_ON(!__builtin_constant_p(feature));
 164
 165 #ifdef CONFIG_JUMP_LABEL_FEATURE_CHECK_DEBUG
 166         if (!static_key_initialized) {
 167                 printk("Warning! mmu_has_feature() used prior to jump label init!\n");
 168                 dump_stack();
 169                 return early_mmu_has_feature(feature);
 170         }
 171 #endif
 172
 173         if (!(MMU_FTRS_POSSIBLE & feature))
 174                 return false;
 175
 176         i = __builtin_ctzl(feature);
 177         return static_branch_likely(&mmu_feature_keys[i]);
 178 }
 179
 180 static inline void mmu_clear_feature(unsigned long feature)
 181 {
 182         int i;
 183
 184         i = __builtin_ctzl(feature);
 185         cur_cpu_spec->mmu_features &= ~feature;
 186         static_branch_disable(&mmu_feature_keys[i]);
 187 }
 188 #else
 189
 190 static inline void mmu_feature_keys_init(void)
 191 {
 192
 193 }
 194
 195 static inline bool mmu_has_feature(unsigned long feature)
 196 {
 197         return early_mmu_has_feature(feature);
 198 }
 199
 200 static inline void mmu_clear_feature(unsigned long feature)
 201 {
 202         cur_cpu_spec->mmu_features &= ~feature;
 203 }
 204 #endif /* CONFIG_JUMP_LABEL */
 205
 206 extern unsigned int __start___mmu_ftr_fixup, __stop___mmu_ftr_fixup;
 207
 208 #ifdef CONFIG_PPC64
 209 /* This is our real memory area size on ppc64 server, on embedded, we
 210  * make it match the size our of bolted TLB area
 211  */
 212 extern u64 ppc64_rma_size;
 213
 214 /* Cleanup function used by kexec */
 215 extern void mmu_cleanup_all(void);
 216 extern void radix__mmu_cleanup_all(void);
 217
 218 /* Functions for creating and updating partition table on POWER9 */
 219 extern void mmu_partition_table_init(void);
 220 extern void mmu_partition_table_set_entry(unsigned int lpid, unsigned long dw0,
 221                                           unsigned long dw1);
 222 #endif /* CONFIG_PPC64 */
 223
 224 struct mm_struct;
 225 #ifdef CONFIG_DEBUG_VM
 226 extern void assert_pte_locked(struct mm_struct *mm, unsigned long addr);
 227 #else /* CONFIG_DEBUG_VM */
 228 static inline void assert_pte_locked(struct mm_struct *mm, unsigned long addr)
 229 {
 230 }
 231 #endif /* !CONFIG_DEBUG_VM */
 232
 233 #ifdef CONFIG_PPC_RADIX_MMU
 234 static inline bool radix_enabled(void)
 235 {
 236         return mmu_has_feature(MMU_FTR_TYPE_RADIX);
 237 }
 238
 239 static inline bool early_radix_enabled(void)
 240 {
 241         return early_mmu_has_feature(MMU_FTR_TYPE_RADIX);
 242 }
 243 #else
 244 static inline bool radix_enabled(void)
 245 {
 246         return false;
 247 }
 248
 249 static inline bool early_radix_enabled(void)
 250 {
 251         return false;
 252 }
 253 #endif
 254
 255 #endif /* !__ASSEMBLY__ */
 256
 257 /* The kernel use the constants below to index in the page sizes array.
 258  * The use of fixed constants for this purpose is better for performances
 259  * of the low level hash refill handlers.
 260  *
 261  * A non supported page size has a "shift" field set to 0
 262  *
 263  * Any new page size being implemented can get a new entry in here. Whether
 264  * the kernel will use it or not is a different matter though. The actual page
 265  * size used by hugetlbfs is not defined here and may be made variable
 266  *
 267  * Note: This array ended up being a false good idea as it's growing to the
 268  * point where I wonder if we should replace it with something different,
 269  * to think about, feedback welcome. --BenH.
 270  */
 271
 272 /* These are #defines as they have to be used in assembly */
 273 #define MMU_PAGE_4K     0
 274 #define MMU_PAGE_16K    1
 275 #define MMU_PAGE_64K    2
 276 #define MMU_PAGE_64K_AP 3       /* "Admixed pages" (hash64 only) */
 277 #define MMU_PAGE_256K   4
 278 #define MMU_PAGE_512K   5
 279 #define MMU_PAGE_1M     6
 280 #define MMU_PAGE_2M     7
 281 #define MMU_PAGE_4M     8
 282 #define MMU_PAGE_8M     9
 283 #define MMU_PAGE_16M    10
 284 #define MMU_PAGE_64M    11
 285 #define MMU_PAGE_256M   12
 286 #define MMU_PAGE_1G     13
 287 #define MMU_PAGE_16G    14
 288 #define MMU_PAGE_64G    15
 289
 290 /* N.B. we need to change the type of hpte_page_sizes if this gets to be > 16 */
 291 #define MMU_PAGE_COUNT  16
 292
 293 #ifdef CONFIG_PPC_BOOK3S_64
 294 #include <asm/book3s/64/mmu.h>
 295 #else /* CONFIG_PPC_BOOK3S_64 */
 296
 297 #ifndef __ASSEMBLY__
 298 /* MMU initialization */
 299 extern void early_init_mmu(void);
 300 extern void early_init_mmu_secondary(void);
 301 extern void setup_initial_memory_limit(phys_addr_t first_memblock_base,
 302                                        phys_addr_t first_memblock_size);
 303 static inline void mmu_early_init_devtree(void) { }
 304 #endif /* __ASSEMBLY__ */
 305 #endif
 306
 307 #if defined(CONFIG_PPC_STD_MMU_32)
 308 /* 32-bit classic hash table MMU */
 309 #include <asm/book3s/32/mmu-hash.h>
 310 #elif defined(CONFIG_40x)
 311 /* 40x-style software loaded TLB */
 312 #  include <asm/mmu-40x.h>
 313 #elif defined(CONFIG_44x)
 314 /* 44x-style software loaded TLB */
 315 #  include <asm/mmu-44x.h>
 316 #elif defined(CONFIG_PPC_BOOK3E_MMU)
 317 /* Freescale Book-E software loaded TLB or Book-3e (ISA 2.06+) MMU */
 318 #  include <asm/mmu-book3e.h>
 319 #elif defined (CONFIG_PPC_8xx)
 320 /* Motorola/Freescale 8xx software loaded TLB */
 321 #  include <asm/mmu-8xx.h>
 322 #endif
 323
 324 #endif /* __KERNEL__ */
 325 #endif /* _ASM_POWERPC_MMU_H_ */