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 	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 };
28 extern struct mmu_psize_def mmu_psize_defs[MMU_PAGE_COUNT];
29 #endif /* __ASSEMBLY__ */
30 
31 /* 64-bit classic hash table MMU */
32 #include <asm/book3s/64/mmu-hash.h>
33 
34 #ifndef __ASSEMBLY__
35 /*
36  * ISA 3.0 partition and process table entry format
37  */
38 struct prtb_entry {
39 	__be64 prtb0;
40 	__be64 prtb1;
41 };
42 extern struct prtb_entry *process_tb;
43 
44 struct patb_entry {
45 	__be64 patb0;
46 	__be64 patb1;
47 };
48 extern 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 */
66 extern unsigned int mmu_lpid_bits;
67 
68 /* Number of supported PID bits */
69 extern unsigned int mmu_pid_bits;
70 
71 /* Base PID to allocate from */
72 extern unsigned int mmu_base_pid;
73 
74 /*
75  * memory block size used with radix translation.
76  */
77 extern unsigned long __ro_after_init radix_mem_block_size;
78 
79 #define PRTB_SIZE_SHIFT	(mmu_pid_bits + 4)
80 #define PRTB_ENTRIES	(1ul << mmu_pid_bits)
81 
82 #define PATB_SIZE_SHIFT	(mmu_lpid_bits + 4)
83 #define PATB_ENTRIES	(1ul << mmu_lpid_bits)
84 
85 typedef unsigned long mm_context_id_t;
86 struct spinlock;
87 
88 /* Maximum possible number of NPUs in a system. */
89 #define NV_MAX_NPUS 8
90 
91 typedef struct {
92 	union {
93 		/*
94 		 * We use id as the PIDR content for radix. On hash we can use
95 		 * more than one id. The extended ids are used when we start
96 		 * having address above 512TB. We allocate one extended id
97 		 * for each 512TB. The new id is then used with the 49 bit
98 		 * EA to build a new VA. We always use ESID_BITS_1T_MASK bits
99 		 * from EA and new context ids to build the new VAs.
100 		 */
101 		mm_context_id_t id;
102 #ifdef CONFIG_PPC_64S_HASH_MMU
103 		mm_context_id_t extended_id[TASK_SIZE_USER64/TASK_CONTEXT_SIZE];
104 #endif
105 	};
106 
107 	/* Number of bits in the mm_cpumask */
108 	atomic_t active_cpus;
109 
110 	/* Number of users of the external (Nest) MMU */
111 	atomic_t copros;
112 
113 	/* Number of user space windows opened in process mm_context */
114 	atomic_t vas_windows;
115 
116 #ifdef CONFIG_PPC_64S_HASH_MMU
117 	struct hash_mm_context *hash_context;
118 #endif
119 
120 	void __user *vdso;
121 	/*
122 	 * pagetable fragment support
123 	 */
124 	void *pte_frag;
125 	void *pmd_frag;
126 #ifdef CONFIG_SPAPR_TCE_IOMMU
127 	struct list_head iommu_group_mem_list;
128 #endif
129 
130 #ifdef CONFIG_PPC_MEM_KEYS
131 	/*
132 	 * Each bit represents one protection key.
133 	 * bit set   -> key allocated
134 	 * bit unset -> key available for allocation
135 	 */
136 	u32 pkey_allocation_map;
137 	s16 execute_only_pkey; /* key holding execute-only protection */
138 #endif
139 } mm_context_t;
140 
141 #ifdef CONFIG_PPC_64S_HASH_MMU
142 static inline u16 mm_ctx_user_psize(mm_context_t *ctx)
143 {
144 	return ctx->hash_context->user_psize;
145 }
146 
147 static inline void mm_ctx_set_user_psize(mm_context_t *ctx, u16 user_psize)
148 {
149 	ctx->hash_context->user_psize = user_psize;
150 }
151 
152 static inline unsigned char *mm_ctx_low_slices(mm_context_t *ctx)
153 {
154 	return ctx->hash_context->low_slices_psize;
155 }
156 
157 static inline unsigned char *mm_ctx_high_slices(mm_context_t *ctx)
158 {
159 	return ctx->hash_context->high_slices_psize;
160 }
161 
162 static inline unsigned long mm_ctx_slb_addr_limit(mm_context_t *ctx)
163 {
164 	return ctx->hash_context->slb_addr_limit;
165 }
166 
167 static inline void mm_ctx_set_slb_addr_limit(mm_context_t *ctx, unsigned long limit)
168 {
169 	ctx->hash_context->slb_addr_limit = limit;
170 }
171 
172 static inline struct slice_mask *slice_mask_for_size(mm_context_t *ctx, int psize)
173 {
174 #ifdef CONFIG_PPC_64K_PAGES
175 	if (psize == MMU_PAGE_64K)
176 		return &ctx->hash_context->mask_64k;
177 #endif
178 #ifdef CONFIG_HUGETLB_PAGE
179 	if (psize == MMU_PAGE_16M)
180 		return &ctx->hash_context->mask_16m;
181 	if (psize == MMU_PAGE_16G)
182 		return &ctx->hash_context->mask_16g;
183 #endif
184 	BUG_ON(psize != MMU_PAGE_4K);
185 
186 	return &ctx->hash_context->mask_4k;
187 }
188 
189 #ifdef CONFIG_PPC_SUBPAGE_PROT
190 static inline struct subpage_prot_table *mm_ctx_subpage_prot(mm_context_t *ctx)
191 {
192 	return ctx->hash_context->spt;
193 }
194 #endif
195 
196 /*
197  * The current system page and segment sizes
198  */
199 extern int mmu_virtual_psize;
200 extern int mmu_vmalloc_psize;
201 extern int mmu_io_psize;
202 #else /* CONFIG_PPC_64S_HASH_MMU */
203 #ifdef CONFIG_PPC_64K_PAGES
204 #define mmu_virtual_psize MMU_PAGE_64K
205 #else
206 #define mmu_virtual_psize MMU_PAGE_4K
207 #endif
208 #endif
209 extern int mmu_linear_psize;
210 extern int mmu_vmemmap_psize;
211 
212 /* MMU initialization */
213 void mmu_early_init_devtree(void);
214 void hash__early_init_devtree(void);
215 void radix__early_init_devtree(void);
216 #ifdef CONFIG_PPC_PKEY
217 void pkey_early_init_devtree(void);
218 #else
219 static inline void pkey_early_init_devtree(void) {}
220 #endif
221 
222 extern void hash__early_init_mmu(void);
223 extern void radix__early_init_mmu(void);
224 static inline void __init early_init_mmu(void)
225 {
226 	if (radix_enabled())
227 		return radix__early_init_mmu();
228 	return hash__early_init_mmu();
229 }
230 extern void hash__early_init_mmu_secondary(void);
231 extern void radix__early_init_mmu_secondary(void);
232 static inline void early_init_mmu_secondary(void)
233 {
234 	if (radix_enabled())
235 		return radix__early_init_mmu_secondary();
236 	return hash__early_init_mmu_secondary();
237 }
238 
239 extern void hash__setup_initial_memory_limit(phys_addr_t first_memblock_base,
240 					 phys_addr_t first_memblock_size);
241 static inline void setup_initial_memory_limit(phys_addr_t first_memblock_base,
242 					      phys_addr_t first_memblock_size)
243 {
244 	/*
245 	 * Hash has more strict restrictions. At this point we don't
246 	 * know which translations we will pick. Hence go with hash
247 	 * restrictions.
248 	 */
249 	if (!early_radix_enabled())
250 		hash__setup_initial_memory_limit(first_memblock_base,
251 						 first_memblock_size);
252 }
253 
254 #ifdef CONFIG_PPC_PSERIES
255 void __init radix_init_pseries(void);
256 #else
257 static inline void radix_init_pseries(void) { }
258 #endif
259 
260 #ifdef CONFIG_HOTPLUG_CPU
261 #define arch_clear_mm_cpumask_cpu(cpu, mm)				\
262 	do {								\
263 		if (cpumask_test_cpu(cpu, mm_cpumask(mm))) {		\
264 			atomic_dec(&(mm)->context.active_cpus);		\
265 			cpumask_clear_cpu(cpu, mm_cpumask(mm));		\
266 		}							\
267 	} while (0)
268 
269 void cleanup_cpu_mmu_context(void);
270 #endif
271 
272 #ifdef CONFIG_PPC_64S_HASH_MMU
273 static inline int get_user_context(mm_context_t *ctx, unsigned long ea)
274 {
275 	int index = ea >> MAX_EA_BITS_PER_CONTEXT;
276 
277 	if (likely(index < ARRAY_SIZE(ctx->extended_id)))
278 		return ctx->extended_id[index];
279 
280 	/* should never happen */
281 	WARN_ON(1);
282 	return 0;
283 }
284 
285 static inline unsigned long get_user_vsid(mm_context_t *ctx,
286 					  unsigned long ea, int ssize)
287 {
288 	unsigned long context = get_user_context(ctx, ea);
289 
290 	return get_vsid(context, ea, ssize);
291 }
292 #endif
293 
294 #endif /* __ASSEMBLY__ */
295 #endif /* _ASM_POWERPC_BOOK3S_64_MMU_H_ */
296