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 extern 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 
82 typedef unsigned long mm_context_id_t;
83 struct spinlock;
84 
85 /* Maximum possible number of NPUs in a system. */
86 #define NV_MAX_NPUS 8
87 
88 typedef 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
139 static inline u16 mm_ctx_user_psize(mm_context_t *ctx)
140 {
141 	return ctx->hash_context->user_psize;
142 }
143 
144 static 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 
149 static inline unsigned char *mm_ctx_low_slices(mm_context_t *ctx)
150 {
151 	return ctx->hash_context->low_slices_psize;
152 }
153 
154 static inline unsigned char *mm_ctx_high_slices(mm_context_t *ctx)
155 {
156 	return ctx->hash_context->high_slices_psize;
157 }
158 
159 static inline unsigned long mm_ctx_slb_addr_limit(mm_context_t *ctx)
160 {
161 	return ctx->hash_context->slb_addr_limit;
162 }
163 
164 static 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 
169 static 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
187 static 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  */
196 extern int mmu_virtual_psize;
197 extern int mmu_vmalloc_psize;
198 extern 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
206 extern int mmu_linear_psize;
207 extern int mmu_vmemmap_psize;
208 
209 /* MMU initialization */
210 void mmu_early_init_devtree(void);
211 void hash__early_init_devtree(void);
212 void radix__early_init_devtree(void);
213 #ifdef CONFIG_PPC_PKEY
214 void pkey_early_init_devtree(void);
215 #else
216 static inline void pkey_early_init_devtree(void) {}
217 #endif
218 
219 extern void hash__early_init_mmu(void);
220 extern void radix__early_init_mmu(void);
221 static 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 }
227 extern void hash__early_init_mmu_secondary(void);
228 extern void radix__early_init_mmu_secondary(void);
229 static 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 
236 extern void hash__setup_initial_memory_limit(phys_addr_t first_memblock_base,
237 					 phys_addr_t first_memblock_size);
238 static 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
252 void __init radix_init_pseries(void);
253 #else
254 static 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 
266 void cleanup_cpu_mmu_context(void);
267 #endif
268 
269 #ifdef CONFIG_PPC_64S_HASH_MMU
270 static 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 
282 static 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 /* __ASSEMBLY__ */
292 #endif /* _ASM_POWERPC_BOOK3S_64_MMU_H_ */
293