1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_POWERPC_BOOK3S_64_MMU_H_
3 #define _ASM_POWERPC_BOOK3S_64_MMU_H_
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:
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 */
23 unsigned long sllp; /* SLB L||LP (exact mask to use in slbmte) */
24 unsigned long ap; /* Ap encoding used by PowerISA 3.0 */
27 extern struct mmu_psize_def mmu_psize_defs[MMU_PAGE_COUNT];
28 #endif /* __ASSEMBLY__ */
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
38 #if defined(CONFIG_SPARSEMEM_VMEMMAP) && defined(CONFIG_SPARSEMEM_EXTREME) && \
39 defined(CONFIG_PPC_64K_PAGES)
40 #define MAX_PHYSMEM_BITS 51
42 #define MAX_PHYSMEM_BITS 46
45 /* 64-bit classic hash table MMU */
46 #include <asm/book3s/64/mmu-hash.h>
50 * ISA 3.0 partition and process table entry format
56 extern struct prtb_entry *process_tb;
62 extern struct patb_entry *partition_tb;
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 */
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
79 /* Number of supported PID bits */
80 extern unsigned int mmu_pid_bits;
82 /* Base PID to allocate from */
83 extern unsigned int mmu_base_pid;
86 * memory block size used with radix translation.
88 extern unsigned int __ro_after_init radix_mem_block_size;
90 #define PRTB_SIZE_SHIFT (mmu_pid_bits + 4)
91 #define PRTB_ENTRIES (1ul << mmu_pid_bits)
94 * Power9 currently only support 64K partition table size.
96 #define PATB_SIZE_SHIFT 16
98 typedef unsigned long mm_context_id_t;
101 /* Maximum possible number of NPUs in a system. */
102 #define NV_MAX_NPUS 8
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.
115 mm_context_id_t extended_id[TASK_SIZE_USER64/TASK_CONTEXT_SIZE];
118 /* Number of bits in the mm_cpumask */
119 atomic_t active_cpus;
121 /* Number of users of the external (Nest) MMU */
124 /* Number of user space windows opened in process mm_context */
125 atomic_t vas_windows;
127 struct hash_mm_context *hash_context;
129 unsigned long vdso_base;
131 * pagetable fragment support
135 #ifdef CONFIG_SPAPR_TCE_IOMMU
136 struct list_head iommu_group_mem_list;
139 #ifdef CONFIG_PPC_MEM_KEYS
141 * Each bit represents one protection key.
142 * bit set -> key allocated
143 * bit unset -> key available for allocation
145 u32 pkey_allocation_map;
146 s16 execute_only_pkey; /* key holding execute-only protection */
150 static inline u16 mm_ctx_user_psize(mm_context_t *ctx)
152 return ctx->hash_context->user_psize;
155 static inline void mm_ctx_set_user_psize(mm_context_t *ctx, u16 user_psize)
157 ctx->hash_context->user_psize = user_psize;
160 static inline unsigned char *mm_ctx_low_slices(mm_context_t *ctx)
162 return ctx->hash_context->low_slices_psize;
165 static inline unsigned char *mm_ctx_high_slices(mm_context_t *ctx)
167 return ctx->hash_context->high_slices_psize;
170 static inline unsigned long mm_ctx_slb_addr_limit(mm_context_t *ctx)
172 return ctx->hash_context->slb_addr_limit;
175 static inline void mm_ctx_set_slb_addr_limit(mm_context_t *ctx, unsigned long limit)
177 ctx->hash_context->slb_addr_limit = limit;
180 static inline struct slice_mask *slice_mask_for_size(mm_context_t *ctx, int psize)
182 #ifdef CONFIG_PPC_64K_PAGES
183 if (psize == MMU_PAGE_64K)
184 return &ctx->hash_context->mask_64k;
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;
192 BUG_ON(psize != MMU_PAGE_4K);
194 return &ctx->hash_context->mask_4k;
197 #ifdef CONFIG_PPC_SUBPAGE_PROT
198 static inline struct subpage_prot_table *mm_ctx_subpage_prot(mm_context_t *ctx)
200 return ctx->hash_context->spt;
205 * The current system page and segment sizes
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;
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);
220 static inline void pkey_early_init_devtree(void) {}
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)
228 return radix__early_init_mmu();
229 return hash__early_init_mmu();
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)
236 return radix__early_init_mmu_secondary();
237 return hash__early_init_mmu_secondary();
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)
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);
254 #ifdef CONFIG_PPC_PSERIES
255 extern void radix_init_pseries(void);
257 static inline void radix_init_pseries(void) { };
260 static inline int get_user_context(mm_context_t *ctx, unsigned long ea)
262 int index = ea >> MAX_EA_BITS_PER_CONTEXT;
264 if (likely(index < ARRAY_SIZE(ctx->extended_id)))
265 return ctx->extended_id[index];
267 /* should never happen */
272 static inline unsigned long get_user_vsid(mm_context_t *ctx,
273 unsigned long ea, int ssize)
275 unsigned long context = get_user_context(ctx, ea);
277 return get_vsid(context, ea, ssize);
280 #endif /* __ASSEMBLY__ */
281 #endif /* _ASM_POWERPC_BOOK3S_64_MMU_H_ */