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];
30 * For BOOK3s 64 with 4k and 64K linux page size
31 * we want to use pointers, because the page table
34 typedef pte_t *pgtable_t;
36 #endif /* __ASSEMBLY__ */
39 * If we store section details in page->flags we can't increase the MAX_PHYSMEM_BITS
40 * if we increase SECTIONS_WIDTH we will not store node details in page->flags and
41 * page_to_nid does a page->section->node lookup
42 * Hence only increase for VMEMMAP. Further depending on SPARSEMEM_EXTREME reduce
43 * memory requirements with large number of sections.
44 * 51 bits is the max physical real address on POWER9
46 #if defined(CONFIG_SPARSEMEM_VMEMMAP) && defined(CONFIG_SPARSEMEM_EXTREME) && \
47 defined(CONFIG_PPC_64K_PAGES)
48 #define MAX_PHYSMEM_BITS 51
50 #define MAX_PHYSMEM_BITS 46
53 /* 64-bit classic hash table MMU */
54 #include <asm/book3s/64/mmu-hash.h>
58 * ISA 3.0 partition and process table entry format
64 extern struct prtb_entry *process_tb;
70 extern struct patb_entry *partition_tb;
72 /* Bits in patb0 field */
73 #define PATB_HR (1UL << 63)
74 #define RPDB_MASK 0x0fffffffffffff00UL
75 #define RPDB_SHIFT (1UL << 8)
76 #define RTS1_SHIFT 61 /* top 2 bits of radix tree size */
77 #define RTS1_MASK (3UL << RTS1_SHIFT)
78 #define RTS2_SHIFT 5 /* bottom 3 bits of radix tree size */
79 #define RTS2_MASK (7UL << RTS2_SHIFT)
80 #define RPDS_MASK 0x1f /* root page dir. size field */
82 /* Bits in patb1 field */
83 #define PATB_GR (1UL << 63) /* guest uses radix; must match HR */
84 #define PRTS_MASK 0x1f /* process table size field */
85 #define PRTB_MASK 0x0ffffffffffff000UL
87 /* Number of supported PID bits */
88 extern unsigned int mmu_pid_bits;
90 /* Base PID to allocate from */
91 extern unsigned int mmu_base_pid;
93 #define PRTB_SIZE_SHIFT (mmu_pid_bits + 4)
94 #define PRTB_ENTRIES (1ul << mmu_pid_bits)
97 * Power9 currently only support 64K partition table size.
99 #define PATB_SIZE_SHIFT 16
101 typedef unsigned long mm_context_id_t;
104 /* Maximum possible number of NPUs in a system. */
105 #define NV_MAX_NPUS 8
108 * One bit per slice. We have lower slices which cover 256MB segments
109 * upto 4G range. That gets us 16 low slices. For the rest we track slices
114 DECLARE_BITMAP(high_slices, SLICE_NUM_HIGH);
120 * We use id as the PIDR content for radix. On hash we can use
121 * more than one id. The extended ids are used when we start
122 * having address above 512TB. We allocate one extended id
123 * for each 512TB. The new id is then used with the 49 bit
124 * EA to build a new VA. We always use ESID_BITS_1T_MASK bits
125 * from EA and new context ids to build the new VAs.
128 mm_context_id_t extended_id[TASK_SIZE_USER64/TASK_CONTEXT_SIZE];
130 u16 user_psize; /* page size index */
132 /* Number of bits in the mm_cpumask */
133 atomic_t active_cpus;
135 /* Number of users of the external (Nest) MMU */
138 /* NPU NMMU context */
139 struct npu_context *npu_context;
141 #ifdef CONFIG_PPC_MM_SLICES
142 /* SLB page size encodings*/
143 unsigned char low_slices_psize[BITS_PER_LONG / BITS_PER_BYTE];
144 unsigned char high_slices_psize[SLICE_ARRAY_SIZE];
145 unsigned long slb_addr_limit;
146 # ifdef CONFIG_PPC_64K_PAGES
147 struct slice_mask mask_64k;
149 struct slice_mask mask_4k;
150 # ifdef CONFIG_HUGETLB_PAGE
151 struct slice_mask mask_16m;
152 struct slice_mask mask_16g;
155 u16 sllp; /* SLB page size encoding */
157 unsigned long vdso_base;
158 #ifdef CONFIG_PPC_SUBPAGE_PROT
159 struct subpage_prot_table spt;
160 #endif /* CONFIG_PPC_SUBPAGE_PROT */
162 * pagetable fragment support
166 #ifdef CONFIG_SPAPR_TCE_IOMMU
167 struct list_head iommu_group_mem_list;
170 #ifdef CONFIG_PPC_MEM_KEYS
172 * Each bit represents one protection key.
173 * bit set -> key allocated
174 * bit unset -> key available for allocation
176 u32 pkey_allocation_map;
177 s16 execute_only_pkey; /* key holding execute-only protection */
182 * The current system page and segment sizes
184 extern int mmu_linear_psize;
185 extern int mmu_virtual_psize;
186 extern int mmu_vmalloc_psize;
187 extern int mmu_vmemmap_psize;
188 extern int mmu_io_psize;
190 /* MMU initialization */
191 void mmu_early_init_devtree(void);
192 void hash__early_init_devtree(void);
193 void radix__early_init_devtree(void);
194 extern void radix_init_native(void);
195 extern void hash__early_init_mmu(void);
196 extern void radix__early_init_mmu(void);
197 static inline void early_init_mmu(void)
200 return radix__early_init_mmu();
201 return hash__early_init_mmu();
203 extern void hash__early_init_mmu_secondary(void);
204 extern void radix__early_init_mmu_secondary(void);
205 static inline void early_init_mmu_secondary(void)
208 return radix__early_init_mmu_secondary();
209 return hash__early_init_mmu_secondary();
212 extern void hash__setup_initial_memory_limit(phys_addr_t first_memblock_base,
213 phys_addr_t first_memblock_size);
214 extern void radix__setup_initial_memory_limit(phys_addr_t first_memblock_base,
215 phys_addr_t first_memblock_size);
216 static inline void setup_initial_memory_limit(phys_addr_t first_memblock_base,
217 phys_addr_t first_memblock_size)
219 if (early_radix_enabled())
220 return radix__setup_initial_memory_limit(first_memblock_base,
221 first_memblock_size);
222 return hash__setup_initial_memory_limit(first_memblock_base,
223 first_memblock_size);
226 extern int (*register_process_table)(unsigned long base, unsigned long page_size,
227 unsigned long tbl_size);
229 #ifdef CONFIG_PPC_PSERIES
230 extern void radix_init_pseries(void);
232 static inline void radix_init_pseries(void) { };
235 static inline int get_user_context(mm_context_t *ctx, unsigned long ea)
237 int index = ea >> MAX_EA_BITS_PER_CONTEXT;
239 if (likely(index < ARRAY_SIZE(ctx->extended_id)))
240 return ctx->extended_id[index];
242 /* should never happen */
247 static inline unsigned long get_user_vsid(mm_context_t *ctx,
248 unsigned long ea, int ssize)
250 unsigned long context = get_user_context(ctx, ea);
252 return get_vsid(context, ea, ssize);
255 #endif /* __ASSEMBLY__ */
256 #endif /* _ASM_POWERPC_BOOK3S_64_MMU_H_ */