1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _ASM_POWERPC_BOOK3S_64_MMU_H_ 3 #define _ASM_POWERPC_BOOK3S_64_MMU_H_ 4 5 #include <asm/page.h> 6 7 #ifndef __ASSEMBLY__ 8 /* 9 * Page size definition 10 * 11 * shift : is the "PAGE_SHIFT" value for that page size 12 * sllp : is a bit mask with the value of SLB L || LP to be or'ed 13 * directly to a slbmte "vsid" value 14 * penc : is the HPTE encoding mask for the "LP" field: 15 * 16 */ 17 struct mmu_psize_def { 18 unsigned int shift; /* number of bits */ 19 int penc[MMU_PAGE_COUNT]; /* HPTE encoding */ 20 unsigned int tlbiel; /* tlbiel supported for that page size */ 21 unsigned long avpnm; /* bits to mask out in AVPN in the HPTE */ 22 union { 23 unsigned long sllp; /* SLB L||LP (exact mask to use in slbmte) */ 24 unsigned long ap; /* Ap encoding used by PowerISA 3.0 */ 25 }; 26 }; 27 extern struct mmu_psize_def mmu_psize_defs[MMU_PAGE_COUNT]; 28 #endif /* __ASSEMBLY__ */ 29 30 /* 31 * If we store section details in page->flags we can't increase the MAX_PHYSMEM_BITS 32 * if we increase SECTIONS_WIDTH we will not store node details in page->flags and 33 * page_to_nid does a page->section->node lookup 34 * Hence only increase for VMEMMAP. Further depending on SPARSEMEM_EXTREME reduce 35 * memory requirements with large number of sections. 36 * 51 bits is the max physical real address on POWER9 37 */ 38 #if defined(CONFIG_SPARSEMEM_VMEMMAP) && defined(CONFIG_SPARSEMEM_EXTREME) && \ 39 defined(CONFIG_PPC_64K_PAGES) 40 #define MAX_PHYSMEM_BITS 51 41 #else 42 #define MAX_PHYSMEM_BITS 46 43 #endif 44 45 /* 64-bit classic hash table MMU */ 46 #include <asm/book3s/64/mmu-hash.h> 47 48 #ifndef __ASSEMBLY__ 49 /* 50 * ISA 3.0 partition and process table entry format 51 */ 52 struct prtb_entry { 53 __be64 prtb0; 54 __be64 prtb1; 55 }; 56 extern struct prtb_entry *process_tb; 57 58 struct patb_entry { 59 __be64 patb0; 60 __be64 patb1; 61 }; 62 extern struct patb_entry *partition_tb; 63 64 /* Bits in patb0 field */ 65 #define PATB_HR (1UL << 63) 66 #define RPDB_MASK 0x0fffffffffffff00UL 67 #define RPDB_SHIFT (1UL << 8) 68 #define RTS1_SHIFT 61 /* top 2 bits of radix tree size */ 69 #define RTS1_MASK (3UL << RTS1_SHIFT) 70 #define RTS2_SHIFT 5 /* bottom 3 bits of radix tree size */ 71 #define RTS2_MASK (7UL << RTS2_SHIFT) 72 #define RPDS_MASK 0x1f /* root page dir. size field */ 73 74 /* Bits in patb1 field */ 75 #define PATB_GR (1UL << 63) /* guest uses radix; must match HR */ 76 #define PRTS_MASK 0x1f /* process table size field */ 77 #define PRTB_MASK 0x0ffffffffffff000UL 78 79 /* Number of supported PID bits */ 80 extern unsigned int mmu_pid_bits; 81 82 /* Base PID to allocate from */ 83 extern unsigned int mmu_base_pid; 84 85 /* 86 * memory block size used with radix translation. 87 */ 88 extern unsigned int __ro_after_init radix_mem_block_size; 89 90 #define PRTB_SIZE_SHIFT (mmu_pid_bits + 4) 91 #define PRTB_ENTRIES (1ul << mmu_pid_bits) 92 93 /* 94 * Power9 currently only support 64K partition table size. 95 */ 96 #define PATB_SIZE_SHIFT 16 97 98 typedef unsigned long mm_context_id_t; 99 struct spinlock; 100 101 /* Maximum possible number of NPUs in a system. */ 102 #define NV_MAX_NPUS 8 103 104 typedef struct { 105 union { 106 /* 107 * We use id as the PIDR content for radix. On hash we can use 108 * more than one id. The extended ids are used when we start 109 * having address above 512TB. We allocate one extended id 110 * for each 512TB. The new id is then used with the 49 bit 111 * EA to build a new VA. We always use ESID_BITS_1T_MASK bits 112 * from EA and new context ids to build the new VAs. 113 */ 114 mm_context_id_t id; 115 mm_context_id_t extended_id[TASK_SIZE_USER64/TASK_CONTEXT_SIZE]; 116 }; 117 118 /* Number of bits in the mm_cpumask */ 119 atomic_t active_cpus; 120 121 /* Number of users of the external (Nest) MMU */ 122 atomic_t copros; 123 124 /* Number of user space windows opened in process mm_context */ 125 atomic_t vas_windows; 126 127 struct hash_mm_context *hash_context; 128 129 unsigned long vdso_base; 130 /* 131 * pagetable fragment support 132 */ 133 void *pte_frag; 134 void *pmd_frag; 135 #ifdef CONFIG_SPAPR_TCE_IOMMU 136 struct list_head iommu_group_mem_list; 137 #endif 138 139 #ifdef CONFIG_PPC_MEM_KEYS 140 /* 141 * Each bit represents one protection key. 142 * bit set -> key allocated 143 * bit unset -> key available for allocation 144 */ 145 u32 pkey_allocation_map; 146 s16 execute_only_pkey; /* key holding execute-only protection */ 147 #endif 148 } mm_context_t; 149 150 static inline u16 mm_ctx_user_psize(mm_context_t *ctx) 151 { 152 return ctx->hash_context->user_psize; 153 } 154 155 static inline void mm_ctx_set_user_psize(mm_context_t *ctx, u16 user_psize) 156 { 157 ctx->hash_context->user_psize = user_psize; 158 } 159 160 static inline unsigned char *mm_ctx_low_slices(mm_context_t *ctx) 161 { 162 return ctx->hash_context->low_slices_psize; 163 } 164 165 static inline unsigned char *mm_ctx_high_slices(mm_context_t *ctx) 166 { 167 return ctx->hash_context->high_slices_psize; 168 } 169 170 static inline unsigned long mm_ctx_slb_addr_limit(mm_context_t *ctx) 171 { 172 return ctx->hash_context->slb_addr_limit; 173 } 174 175 static inline void mm_ctx_set_slb_addr_limit(mm_context_t *ctx, unsigned long limit) 176 { 177 ctx->hash_context->slb_addr_limit = limit; 178 } 179 180 static inline struct slice_mask *slice_mask_for_size(mm_context_t *ctx, int psize) 181 { 182 #ifdef CONFIG_PPC_64K_PAGES 183 if (psize == MMU_PAGE_64K) 184 return &ctx->hash_context->mask_64k; 185 #endif 186 #ifdef CONFIG_HUGETLB_PAGE 187 if (psize == MMU_PAGE_16M) 188 return &ctx->hash_context->mask_16m; 189 if (psize == MMU_PAGE_16G) 190 return &ctx->hash_context->mask_16g; 191 #endif 192 BUG_ON(psize != MMU_PAGE_4K); 193 194 return &ctx->hash_context->mask_4k; 195 } 196 197 #ifdef CONFIG_PPC_SUBPAGE_PROT 198 static inline struct subpage_prot_table *mm_ctx_subpage_prot(mm_context_t *ctx) 199 { 200 return ctx->hash_context->spt; 201 } 202 #endif 203 204 /* 205 * The current system page and segment sizes 206 */ 207 extern int mmu_linear_psize; 208 extern int mmu_virtual_psize; 209 extern int mmu_vmalloc_psize; 210 extern int mmu_vmemmap_psize; 211 extern int mmu_io_psize; 212 213 /* MMU initialization */ 214 void mmu_early_init_devtree(void); 215 void hash__early_init_devtree(void); 216 void radix__early_init_devtree(void); 217 #ifdef CONFIG_PPC_MEM_KEYS 218 void pkey_early_init_devtree(void); 219 #else 220 static inline void pkey_early_init_devtree(void) {} 221 #endif 222 223 extern void hash__early_init_mmu(void); 224 extern void radix__early_init_mmu(void); 225 static inline void __init early_init_mmu(void) 226 { 227 if (radix_enabled()) 228 return radix__early_init_mmu(); 229 return hash__early_init_mmu(); 230 } 231 extern void hash__early_init_mmu_secondary(void); 232 extern void radix__early_init_mmu_secondary(void); 233 static inline void early_init_mmu_secondary(void) 234 { 235 if (radix_enabled()) 236 return radix__early_init_mmu_secondary(); 237 return hash__early_init_mmu_secondary(); 238 } 239 240 extern void hash__setup_initial_memory_limit(phys_addr_t first_memblock_base, 241 phys_addr_t first_memblock_size); 242 extern void radix__setup_initial_memory_limit(phys_addr_t first_memblock_base, 243 phys_addr_t first_memblock_size); 244 static inline void setup_initial_memory_limit(phys_addr_t first_memblock_base, 245 phys_addr_t first_memblock_size) 246 { 247 if (early_radix_enabled()) 248 return radix__setup_initial_memory_limit(first_memblock_base, 249 first_memblock_size); 250 return hash__setup_initial_memory_limit(first_memblock_base, 251 first_memblock_size); 252 } 253 254 #ifdef CONFIG_PPC_PSERIES 255 extern void radix_init_pseries(void); 256 #else 257 static inline void radix_init_pseries(void) { }; 258 #endif 259 260 static inline int get_user_context(mm_context_t *ctx, unsigned long ea) 261 { 262 int index = ea >> MAX_EA_BITS_PER_CONTEXT; 263 264 if (likely(index < ARRAY_SIZE(ctx->extended_id))) 265 return ctx->extended_id[index]; 266 267 /* should never happen */ 268 WARN_ON(1); 269 return 0; 270 } 271 272 static inline unsigned long get_user_vsid(mm_context_t *ctx, 273 unsigned long ea, int ssize) 274 { 275 unsigned long context = get_user_context(ctx, ea); 276 277 return get_vsid(context, ea, ssize); 278 } 279 280 #endif /* __ASSEMBLY__ */ 281 #endif /* _ASM_POWERPC_BOOK3S_64_MMU_H_ */ 282