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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 __ASSEMBLER__
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 */
17struct 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 unsigned long h_rpt_pgsize; /* H_RPT_INVALIDATE page size encoding */
23 union {
24 unsigned long sllp; /* SLB L||LP (exact mask to use in slbmte) */
25 unsigned long ap; /* Ap encoding used by PowerISA 3.0 */
26 };
27};
28extern struct mmu_psize_def mmu_psize_defs[MMU_PAGE_COUNT];
29#endif /* __ASSEMBLER__ */
30
31/* 64-bit classic hash table MMU */
32#include <asm/book3s/64/mmu-hash.h>
33
34#ifndef __ASSEMBLER__
35/*
36 * ISA 3.0 partition and process table entry format
37 */
38struct prtb_entry {
39 __be64 prtb0;
40 __be64 prtb1;
41};
42extern struct prtb_entry *process_tb;
43
44struct patb_entry {
45 __be64 patb0;
46 __be64 patb1;
47};
48extern struct patb_entry *partition_tb;
49
50/* Bits in patb0 field */
51#define PATB_HR (1UL << 63)
52#define RPDB_MASK 0x0fffffffffffff00UL
53#define RPDB_SHIFT (1UL << 8)
54#define RTS1_SHIFT 61 /* top 2 bits of radix tree size */
55#define RTS1_MASK (3UL << RTS1_SHIFT)
56#define RTS2_SHIFT 5 /* bottom 3 bits of radix tree size */
57#define RTS2_MASK (7UL << RTS2_SHIFT)
58#define RPDS_MASK 0x1f /* root page dir. size field */
59
60/* Bits in patb1 field */
61#define PATB_GR (1UL << 63) /* guest uses radix; must match HR */
62#define PRTS_MASK 0x1f /* process table size field */
63#define PRTB_MASK 0x0ffffffffffff000UL
64
65/* Number of supported LPID bits */
66extern unsigned int mmu_lpid_bits;
67
68/* Number of supported PID bits */
69extern unsigned int mmu_pid_bits;
70
71/* Base PID to allocate from */
72extern unsigned int mmu_base_pid;
73
74extern unsigned long __ro_after_init memory_block_size;
75
76#define PRTB_SIZE_SHIFT (mmu_pid_bits + 4)
77#define PRTB_ENTRIES (1ul << mmu_pid_bits)
78
79#define PATB_SIZE_SHIFT (mmu_lpid_bits + 4)
80#define PATB_ENTRIES (1ul << mmu_lpid_bits)
81
82typedef unsigned long mm_context_id_t;
83struct spinlock;
84
85/* Maximum possible number of NPUs in a system. */
86#define NV_MAX_NPUS 8
87
88typedef struct {
89 union {
90 /*
91 * We use id as the PIDR content for radix. On hash we can use
92 * more than one id. The extended ids are used when we start
93 * having address above 512TB. We allocate one extended id
94 * for each 512TB. The new id is then used with the 49 bit
95 * EA to build a new VA. We always use ESID_BITS_1T_MASK bits
96 * from EA and new context ids to build the new VAs.
97 */
98 mm_context_id_t id;
99#ifdef CONFIG_PPC_64S_HASH_MMU
100 mm_context_id_t extended_id[TASK_SIZE_USER64/TASK_CONTEXT_SIZE];
101#endif
102 };
103
104 /* Number of bits in the mm_cpumask */
105 atomic_t active_cpus;
106
107 /* Number of users of the external (Nest) MMU */
108 atomic_t copros;
109
110 /* Number of user space windows opened in process mm_context */
111 atomic_t vas_windows;
112
113#ifdef CONFIG_PPC_64S_HASH_MMU
114 struct hash_mm_context *hash_context;
115#endif
116
117 void __user *vdso;
118 /*
119 * pagetable fragment support
120 */
121 void *pte_frag;
122 void *pmd_frag;
123#ifdef CONFIG_SPAPR_TCE_IOMMU
124 struct list_head iommu_group_mem_list;
125#endif
126
127#ifdef CONFIG_PPC_MEM_KEYS
128 /*
129 * Each bit represents one protection key.
130 * bit set -> key allocated
131 * bit unset -> key available for allocation
132 */
133 u32 pkey_allocation_map;
134 s16 execute_only_pkey; /* key holding execute-only protection */
135#endif
136} mm_context_t;
137
138#ifdef CONFIG_PPC_64S_HASH_MMU
139static inline u16 mm_ctx_user_psize(mm_context_t *ctx)
140{
141 return ctx->hash_context->user_psize;
142}
143
144static inline void mm_ctx_set_user_psize(mm_context_t *ctx, u16 user_psize)
145{
146 ctx->hash_context->user_psize = user_psize;
147}
148
149static inline unsigned char *mm_ctx_low_slices(mm_context_t *ctx)
150{
151 return ctx->hash_context->low_slices_psize;
152}
153
154static inline unsigned char *mm_ctx_high_slices(mm_context_t *ctx)
155{
156 return ctx->hash_context->high_slices_psize;
157}
158
159static inline unsigned long mm_ctx_slb_addr_limit(mm_context_t *ctx)
160{
161 return ctx->hash_context->slb_addr_limit;
162}
163
164static inline void mm_ctx_set_slb_addr_limit(mm_context_t *ctx, unsigned long limit)
165{
166 ctx->hash_context->slb_addr_limit = limit;
167}
168
169static inline struct slice_mask *slice_mask_for_size(mm_context_t *ctx, int psize)
170{
171#ifdef CONFIG_PPC_64K_PAGES
172 if (psize == MMU_PAGE_64K)
173 return &ctx->hash_context->mask_64k;
174#endif
175#ifdef CONFIG_HUGETLB_PAGE
176 if (psize == MMU_PAGE_16M)
177 return &ctx->hash_context->mask_16m;
178 if (psize == MMU_PAGE_16G)
179 return &ctx->hash_context->mask_16g;
180#endif
181 BUG_ON(psize != MMU_PAGE_4K);
182
183 return &ctx->hash_context->mask_4k;
184}
185
186#ifdef CONFIG_PPC_SUBPAGE_PROT
187static inline struct subpage_prot_table *mm_ctx_subpage_prot(mm_context_t *ctx)
188{
189 return ctx->hash_context->spt;
190}
191#endif
192
193/*
194 * The current system page and segment sizes
195 */
196extern int mmu_virtual_psize;
197extern int mmu_vmalloc_psize;
198extern int mmu_io_psize;
199#else /* CONFIG_PPC_64S_HASH_MMU */
200#ifdef CONFIG_PPC_64K_PAGES
201#define mmu_virtual_psize MMU_PAGE_64K
202#else
203#define mmu_virtual_psize MMU_PAGE_4K
204#endif
205#endif
206extern int mmu_linear_psize;
207extern int mmu_vmemmap_psize;
208
209/* MMU initialization */
210void mmu_early_init_devtree(void);
211void hash__early_init_devtree(void);
212void radix__early_init_devtree(void);
213#ifdef CONFIG_PPC_PKEY
214void pkey_early_init_devtree(void);
215#else
216static inline void pkey_early_init_devtree(void) {}
217#endif
218
219extern void hash__early_init_mmu(void);
220extern void radix__early_init_mmu(void);
221static inline void __init early_init_mmu(void)
222{
223 if (radix_enabled())
224 return radix__early_init_mmu();
225 return hash__early_init_mmu();
226}
227extern void hash__early_init_mmu_secondary(void);
228extern void radix__early_init_mmu_secondary(void);
229static inline void early_init_mmu_secondary(void)
230{
231 if (radix_enabled())
232 return radix__early_init_mmu_secondary();
233 return hash__early_init_mmu_secondary();
234}
235
236extern void hash__setup_initial_memory_limit(phys_addr_t first_memblock_base,
237 phys_addr_t first_memblock_size);
238static inline void setup_initial_memory_limit(phys_addr_t first_memblock_base,
239 phys_addr_t first_memblock_size)
240{
241 /*
242 * Hash has more strict restrictions. At this point we don't
243 * know which translations we will pick. Hence go with hash
244 * restrictions.
245 */
246 if (!early_radix_enabled())
247 hash__setup_initial_memory_limit(first_memblock_base,
248 first_memblock_size);
249}
250
251#ifdef CONFIG_PPC_PSERIES
252void __init radix_init_pseries(void);
253#else
254static inline void radix_init_pseries(void) { }
255#endif
256
257#ifdef CONFIG_HOTPLUG_CPU
258#define arch_clear_mm_cpumask_cpu(cpu, mm) \
259 do { \
260 if (cpumask_test_cpu(cpu, mm_cpumask(mm))) { \
261 dec_mm_active_cpus(mm); \
262 cpumask_clear_cpu(cpu, mm_cpumask(mm)); \
263 } \
264 } while (0)
265
266void cleanup_cpu_mmu_context(void);
267#endif
268
269#ifdef CONFIG_PPC_64S_HASH_MMU
270static inline int get_user_context(mm_context_t *ctx, unsigned long ea)
271{
272 int index = ea >> MAX_EA_BITS_PER_CONTEXT;
273
274 if (likely(index < ARRAY_SIZE(ctx->extended_id)))
275 return ctx->extended_id[index];
276
277 /* should never happen */
278 WARN_ON(1);
279 return 0;
280}
281
282static inline unsigned long get_user_vsid(mm_context_t *ctx,
283 unsigned long ea, int ssize)
284{
285 unsigned long context = get_user_context(ctx, ea);
286
287 return get_vsid(context, ea, ssize);
288}
289#endif
290
291#endif /* __ASSEMBLER__ */
292#endif /* _ASM_POWERPC_BOOK3S_64_MMU_H_ */
293

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source code of linux/arch/powerpc/include/asm/book3s/64/mmu.h