1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_POWERPC_MMU_H_
3 #define _ASM_POWERPC_MMU_H_
4 #ifdef __KERNEL__
5
6 #include <linux/types.h>
7
8 #include <asm/asm-const.h>
9
10 /*
11 * MMU features bit definitions
12 */
13
14 /*
15 * MMU families
16 */
17 #define MMU_FTR_HPTE_TABLE ASM_CONST(0x00000001)
18 #define MMU_FTR_TYPE_8xx ASM_CONST(0x00000002)
19 #define MMU_FTR_TYPE_44x ASM_CONST(0x00000008)
20 #define MMU_FTR_TYPE_FSL_E ASM_CONST(0x00000010)
21 #define MMU_FTR_TYPE_47x ASM_CONST(0x00000020)
22
23 /* Radix page table supported and enabled */
24 #define MMU_FTR_TYPE_RADIX ASM_CONST(0x00000040)
25
26 /*
27 * Individual features below.
28 */
29
30 /*
31 * Supports KUAP feature
32 * key 0 controlling userspace addresses on radix
33 * Key 3 on hash
34 */
35 #define MMU_FTR_KUAP ASM_CONST(0x00000200)
36
37 /*
38 * Supports KUEP feature
39 * key 0 controlling userspace addresses on radix
40 * Key 3 on hash
41 */
42 #define MMU_FTR_BOOK3S_KUEP ASM_CONST(0x00000400)
43
44 /*
45 * Support for memory protection keys.
46 */
47 #define MMU_FTR_PKEY ASM_CONST(0x00000800)
48
49 /* Guest Translation Shootdown Enable */
50 #define MMU_FTR_GTSE ASM_CONST(0x00001000)
51
52 /*
53 * Support for 68 bit VA space. We added that from ISA 2.05
54 */
55 #define MMU_FTR_68_BIT_VA ASM_CONST(0x00002000)
56 /*
57 * Kernel read only support.
58 * We added the ppp value 0b110 in ISA 2.04.
59 */
60 #define MMU_FTR_KERNEL_RO ASM_CONST(0x00004000)
61
62 /*
63 * We need to clear top 16bits of va (from the remaining 64 bits )in
64 * tlbie* instructions
65 */
66 #define MMU_FTR_TLBIE_CROP_VA ASM_CONST(0x00008000)
67
68 /* Enable use of high BAT registers */
69 #define MMU_FTR_USE_HIGH_BATS ASM_CONST(0x00010000)
70
71 /* Enable >32-bit physical addresses on 32-bit processor, only used
72 * by CONFIG_PPC_BOOK3S_32 currently as BookE supports that from day 1
73 */
74 #define MMU_FTR_BIG_PHYS ASM_CONST(0x00020000)
75
76 /* Enable use of broadcast TLB invalidations. We don't always set it
77 * on processors that support it due to other constraints with the
78 * use of such invalidations
79 */
80 #define MMU_FTR_USE_TLBIVAX_BCAST ASM_CONST(0x00040000)
81
82 /* Enable use of tlbilx invalidate instructions.
83 */
84 #define MMU_FTR_USE_TLBILX ASM_CONST(0x00080000)
85
86 /* This indicates that the processor cannot handle multiple outstanding
87 * broadcast tlbivax or tlbsync. This makes the code use a spinlock
88 * around such invalidate forms.
89 */
90 #define MMU_FTR_LOCK_BCAST_INVAL ASM_CONST(0x00100000)
91
92 /* This indicates that the processor doesn't handle way selection
93 * properly and needs SW to track and update the LRU state. This
94 * is specific to an errata on e300c2/c3/c4 class parts
95 */
96 #define MMU_FTR_NEED_DTLB_SW_LRU ASM_CONST(0x00200000)
97
98 /* Doesn't support the B bit (1T segment) in SLBIE
99 */
100 #define MMU_FTR_NO_SLBIE_B ASM_CONST(0x02000000)
101
102 /* Support 16M large pages
103 */
104 #define MMU_FTR_16M_PAGE ASM_CONST(0x04000000)
105
106 /* Supports TLBIEL variant
107 */
108 #define MMU_FTR_TLBIEL ASM_CONST(0x08000000)
109
110 /* Supports tlbies w/o locking
111 */
112 #define MMU_FTR_LOCKLESS_TLBIE ASM_CONST(0x10000000)
113
114 /* Large pages can be marked CI
115 */
116 #define MMU_FTR_CI_LARGE_PAGE ASM_CONST(0x20000000)
117
118 /* 1T segments available
119 */
120 #define MMU_FTR_1T_SEGMENT ASM_CONST(0x40000000)
121
122 // NX paste RMA reject in DSI
123 #define MMU_FTR_NX_DSI ASM_CONST(0x80000000)
124
125 /* MMU feature bit sets for various CPUs */
126 #define MMU_FTRS_DEFAULT_HPTE_ARCH_V2 (MMU_FTR_HPTE_TABLE | MMU_FTR_TLBIEL | MMU_FTR_16M_PAGE)
127 #define MMU_FTRS_POWER MMU_FTRS_DEFAULT_HPTE_ARCH_V2
128 #define MMU_FTRS_PPC970 MMU_FTRS_POWER | MMU_FTR_TLBIE_CROP_VA
129 #define MMU_FTRS_POWER5 MMU_FTRS_POWER | MMU_FTR_LOCKLESS_TLBIE
130 #define MMU_FTRS_POWER6 MMU_FTRS_POWER5 | MMU_FTR_KERNEL_RO | MMU_FTR_68_BIT_VA
131 #define MMU_FTRS_POWER7 MMU_FTRS_POWER6
132 #define MMU_FTRS_POWER8 MMU_FTRS_POWER6
133 #define MMU_FTRS_POWER9 MMU_FTRS_POWER6
134 #define MMU_FTRS_POWER10 MMU_FTRS_POWER6
135 #define MMU_FTRS_POWER11 MMU_FTRS_POWER6
136 #define MMU_FTRS_CELL MMU_FTRS_DEFAULT_HPTE_ARCH_V2 | \
137 MMU_FTR_CI_LARGE_PAGE
138 #define MMU_FTRS_PA6T MMU_FTRS_DEFAULT_HPTE_ARCH_V2 | \
139 MMU_FTR_CI_LARGE_PAGE | MMU_FTR_NO_SLBIE_B
140 #ifndef __ASSEMBLY__
141 #include <linux/bug.h>
142 #include <asm/cputable.h>
143 #include <asm/page.h>
144
145 typedef pte_t *pgtable_t;
146
147 enum {
148 MMU_FTRS_POSSIBLE =
149 #if defined(CONFIG_PPC_BOOK3S_604)
150 MMU_FTR_HPTE_TABLE |
151 #endif
152 #ifdef CONFIG_PPC_8xx
153 MMU_FTR_TYPE_8xx |
154 #endif
155 #ifdef CONFIG_PPC_47x
156 MMU_FTR_TYPE_47x | MMU_FTR_USE_TLBIVAX_BCAST | MMU_FTR_LOCK_BCAST_INVAL |
157 #elif defined(CONFIG_44x)
158 MMU_FTR_TYPE_44x |
159 #endif
160 #ifdef CONFIG_PPC_E500
161 MMU_FTR_TYPE_FSL_E | MMU_FTR_BIG_PHYS | MMU_FTR_USE_TLBILX |
162 #endif
163 #ifdef CONFIG_PPC_BOOK3S_32
164 MMU_FTR_USE_HIGH_BATS |
165 #endif
166 #ifdef CONFIG_PPC_83xx
167 MMU_FTR_NEED_DTLB_SW_LRU |
168 #endif
169 #ifdef CONFIG_PPC_BOOK3S_64
170 MMU_FTR_KERNEL_RO |
171 #ifdef CONFIG_PPC_64S_HASH_MMU
172 MMU_FTR_NO_SLBIE_B | MMU_FTR_16M_PAGE | MMU_FTR_TLBIEL |
173 MMU_FTR_LOCKLESS_TLBIE | MMU_FTR_CI_LARGE_PAGE |
174 MMU_FTR_1T_SEGMENT | MMU_FTR_TLBIE_CROP_VA |
175 MMU_FTR_68_BIT_VA | MMU_FTR_HPTE_TABLE |
176 #endif
177 #ifdef CONFIG_PPC_RADIX_MMU
178 MMU_FTR_TYPE_RADIX |
179 MMU_FTR_GTSE | MMU_FTR_NX_DSI |
180 #endif /* CONFIG_PPC_RADIX_MMU */
181 #endif
182 #ifdef CONFIG_PPC_KUAP
183 MMU_FTR_KUAP |
184 #endif /* CONFIG_PPC_KUAP */
185 #ifdef CONFIG_PPC_MEM_KEYS
186 MMU_FTR_PKEY |
187 #endif
188 #ifdef CONFIG_PPC_KUEP
189 MMU_FTR_BOOK3S_KUEP |
190 #endif /* CONFIG_PPC_KUAP */
191
192 0,
193 };
194
195 #if defined(CONFIG_PPC_BOOK3S_604) && !defined(CONFIG_PPC_BOOK3S_603)
196 #define MMU_FTRS_ALWAYS MMU_FTR_HPTE_TABLE
197 #endif
198 #ifdef CONFIG_PPC_8xx
199 #define MMU_FTRS_ALWAYS MMU_FTR_TYPE_8xx
200 #endif
201 #ifdef CONFIG_PPC_47x
202 #define MMU_FTRS_ALWAYS MMU_FTR_TYPE_47x
203 #elif defined(CONFIG_44x)
204 #define MMU_FTRS_ALWAYS MMU_FTR_TYPE_44x
205 #endif
206 #ifdef CONFIG_PPC_E500
207 #define MMU_FTRS_ALWAYS MMU_FTR_TYPE_FSL_E
208 #endif
209
210 /* BOOK3S_64 options */
211 #if defined(CONFIG_PPC_RADIX_MMU) && !defined(CONFIG_PPC_64S_HASH_MMU)
212 #define MMU_FTRS_ALWAYS MMU_FTR_TYPE_RADIX
213 #elif !defined(CONFIG_PPC_RADIX_MMU) && defined(CONFIG_PPC_64S_HASH_MMU)
214 #define MMU_FTRS_ALWAYS MMU_FTR_HPTE_TABLE
215 #endif
216
217 #ifndef MMU_FTRS_ALWAYS
218 #define MMU_FTRS_ALWAYS 0
219 #endif
220
221 static __always_inline bool early_mmu_has_feature(unsigned long feature)
222 {
223 if (MMU_FTRS_ALWAYS & feature)
224 return true;
225
226 return !!(MMU_FTRS_POSSIBLE & cur_cpu_spec->mmu_features & feature);
227 }
228
229 #ifdef CONFIG_JUMP_LABEL_FEATURE_CHECKS
230 #include <linux/jump_label.h>
231
232 #define NUM_MMU_FTR_KEYS 32
233
234 extern struct static_key_true mmu_feature_keys[NUM_MMU_FTR_KEYS];
235
236 extern void mmu_feature_keys_init(void);
237
238 static __always_inline bool mmu_has_feature(unsigned long feature)
239 {
240 int i;
241
242 BUILD_BUG_ON(!__builtin_constant_p(feature));
243 BUILD_BUG_ON(__builtin_popcountl(feature) > 1);
244
245 #ifdef CONFIG_JUMP_LABEL_FEATURE_CHECK_DEBUG
246 if (!static_key_feature_checks_initialized) {
247 printk("Warning! mmu_has_feature() used prior to jump label init!\n");
248 dump_stack();
249 return early_mmu_has_feature(feature);
250 }
251 #endif
252
253 if (MMU_FTRS_ALWAYS & feature)
254 return true;
255
256 if (!(MMU_FTRS_POSSIBLE & feature))
257 return false;
258
259 i = __builtin_ctzl(feature);
260 return static_branch_likely(&mmu_feature_keys[i]);
261 }
262
263 static inline void mmu_clear_feature(unsigned long feature)
264 {
265 int i;
266
267 i = __builtin_ctzl(feature);
268 cur_cpu_spec->mmu_features &= ~feature;
269 static_branch_disable(&mmu_feature_keys[i]);
270 }
271 #else
272
273 static inline void mmu_feature_keys_init(void)
274 {
275
276 }
277
278 static __always_inline bool mmu_has_feature(unsigned long feature)
279 {
280 return early_mmu_has_feature(feature);
281 }
282
283 static inline void mmu_clear_feature(unsigned long feature)
284 {
285 cur_cpu_spec->mmu_features &= ~feature;
286 }
287 #endif /* CONFIG_JUMP_LABEL */
288
289 extern unsigned int __start___mmu_ftr_fixup, __stop___mmu_ftr_fixup;
290
291 #ifdef CONFIG_PPC64
292 /* This is our real memory area size on ppc64 server, on embedded, we
293 * make it match the size our of bolted TLB area
294 */
295 extern u64 ppc64_rma_size;
296
297 /* Cleanup function used by kexec */
298 extern void mmu_cleanup_all(void);
299 extern void radix__mmu_cleanup_all(void);
300
301 /* Functions for creating and updating partition table on POWER9 */
302 extern void mmu_partition_table_init(void);
303 extern void mmu_partition_table_set_entry(unsigned int lpid, unsigned long dw0,
304 unsigned long dw1, bool flush);
305 #endif /* CONFIG_PPC64 */
306
307 struct mm_struct;
308 #ifdef CONFIG_DEBUG_VM
309 extern void assert_pte_locked(struct mm_struct *mm, unsigned long addr);
310 #else /* CONFIG_DEBUG_VM */
311 static inline void assert_pte_locked(struct mm_struct *mm, unsigned long addr)
312 {
313 }
314 #endif /* !CONFIG_DEBUG_VM */
315
316 static __always_inline bool radix_enabled(void)
317 {
318 return mmu_has_feature(MMU_FTR_TYPE_RADIX);
319 }
320
321 static __always_inline bool early_radix_enabled(void)
322 {
323 return early_mmu_has_feature(MMU_FTR_TYPE_RADIX);
324 }
325
326 static inline bool strict_kernel_rwx_enabled(void)
327 {
328 return IS_ENABLED(CONFIG_STRICT_KERNEL_RWX) && rodata_enabled;
329 }
330
331 static inline bool strict_module_rwx_enabled(void)
332 {
333 return IS_ENABLED(CONFIG_STRICT_MODULE_RWX) && strict_kernel_rwx_enabled();
334 }
335 #endif /* !__ASSEMBLY__ */
336
337 /* The kernel use the constants below to index in the page sizes array.
338 * The use of fixed constants for this purpose is better for performances
339 * of the low level hash refill handlers.
340 *
341 * A non supported page size has a "shift" field set to 0
342 *
343 * Any new page size being implemented can get a new entry in here. Whether
344 * the kernel will use it or not is a different matter though. The actual page
345 * size used by hugetlbfs is not defined here and may be made variable
346 *
347 * Note: This array ended up being a false good idea as it's growing to the
348 * point where I wonder if we should replace it with something different,
349 * to think about, feedback welcome. --BenH.
350 */
351
352 /* These are #defines as they have to be used in assembly */
353 #define MMU_PAGE_4K 0
354 #define MMU_PAGE_16K 1
355 #define MMU_PAGE_64K 2
356 #define MMU_PAGE_64K_AP 3 /* "Admixed pages" (hash64 only) */
357 #define MMU_PAGE_256K 4
358 #define MMU_PAGE_512K 5
359 #define MMU_PAGE_1M 6
360 #define MMU_PAGE_2M 7
361 #define MMU_PAGE_4M 8
362 #define MMU_PAGE_8M 9
363 #define MMU_PAGE_16M 10
364 #define MMU_PAGE_64M 11
365 #define MMU_PAGE_256M 12
366 #define MMU_PAGE_1G 13
367 #define MMU_PAGE_16G 14
368 #define MMU_PAGE_64G 15
369
370 /*
371 * N.B. we need to change the type of hpte_page_sizes if this gets to be > 16
372 * Also we need to change he type of mm_context.low/high_slices_psize.
373 */
374 #define MMU_PAGE_COUNT 16
375
376 #ifdef CONFIG_PPC_BOOK3S_64
377 #include <asm/book3s/64/mmu.h>
378 #else /* CONFIG_PPC_BOOK3S_64 */
379
380 #ifndef __ASSEMBLY__
381 /* MMU initialization */
382 extern void early_init_mmu(void);
383 extern void early_init_mmu_secondary(void);
384 extern void setup_initial_memory_limit(phys_addr_t first_memblock_base,
385 phys_addr_t first_memblock_size);
386 static inline void mmu_early_init_devtree(void) { }
387
388 static inline void pkey_early_init_devtree(void) {}
389
390 extern void *abatron_pteptrs[2];
391 #endif /* __ASSEMBLY__ */
392 #endif
393
394 #if defined(CONFIG_PPC_BOOK3S_32)
395 /* 32-bit classic hash table MMU */
396 #include <asm/book3s/32/mmu-hash.h>
397 #elif defined(CONFIG_PPC_MMU_NOHASH)
398 #include <asm/nohash/mmu.h>
399 #endif
400
401 #endif /* __KERNEL__ */
402 #endif /* _ASM_POWERPC_MMU_H_ */
403
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