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_40x ASM_CONST(0x00000004)
20 #define MMU_FTR_TYPE_44x ASM_CONST(0x00000008)
21 #define MMU_FTR_TYPE_FSL_E ASM_CONST(0x00000010)
22 #define MMU_FTR_TYPE_47x ASM_CONST(0x00000020)
23
24 /* Radix page table supported and enabled */
25 #define MMU_FTR_TYPE_RADIX ASM_CONST(0x00000040)
26
27 /*
28 * Individual features below.
29 */
30
31 /*
32 * Supports KUAP feature
33 * key 0 controlling userspace addresses on radix
34 * Key 3 on hash
35 */
36 #define MMU_FTR_KUAP ASM_CONST(0x00000200)
37
38 /*
39 * Supports KUEP feature
40 * key 0 controlling userspace addresses on radix
41 * Key 3 on hash
42 */
43 #define MMU_FTR_BOOK3S_KUEP ASM_CONST(0x00000400)
44
45 /*
46 * Support for memory protection keys.
47 */
48 #define MMU_FTR_PKEY ASM_CONST(0x00000800)
49
50 /* Guest Translation Shootdown Enable */
51 #define MMU_FTR_GTSE ASM_CONST(0x00001000)
52
53 /*
54 * Support for 68 bit VA space. We added that from ISA 2.05
55 */
56 #define MMU_FTR_68_BIT_VA ASM_CONST(0x00002000)
57 /*
58 * Kernel read only support.
59 * We added the ppp value 0b110 in ISA 2.04.
60 */
61 #define MMU_FTR_KERNEL_RO ASM_CONST(0x00004000)
62
63 /*
64 * We need to clear top 16bits of va (from the remaining 64 bits )in
65 * tlbie* instructions
66 */
67 #define MMU_FTR_TLBIE_CROP_VA ASM_CONST(0x00008000)
68
69 /* Enable use of high BAT registers */
70 #define MMU_FTR_USE_HIGH_BATS ASM_CONST(0x00010000)
71
72 /* Enable >32-bit physical addresses on 32-bit processor, only used
73 * by CONFIG_PPC_BOOK3S_32 currently as BookE supports that from day 1
74 */
75 #define MMU_FTR_BIG_PHYS ASM_CONST(0x00020000)
76
77 /* Enable use of broadcast TLB invalidations. We don't always set it
78 * on processors that support it due to other constraints with the
79 * use of such invalidations
80 */
81 #define MMU_FTR_USE_TLBIVAX_BCAST ASM_CONST(0x00040000)
82
83 /* Enable use of tlbilx invalidate instructions.
84 */
85 #define MMU_FTR_USE_TLBILX ASM_CONST(0x00080000)
86
87 /* This indicates that the processor cannot handle multiple outstanding
88 * broadcast tlbivax or tlbsync. This makes the code use a spinlock
89 * around such invalidate forms.
90 */
91 #define MMU_FTR_LOCK_BCAST_INVAL ASM_CONST(0x00100000)
92
93 /* This indicates that the processor doesn't handle way selection
94 * properly and needs SW to track and update the LRU state. This
95 * is specific to an errata on e300c2/c3/c4 class parts
96 */
97 #define MMU_FTR_NEED_DTLB_SW_LRU ASM_CONST(0x00200000)
98
99 /* Doesn't support the B bit (1T segment) in SLBIE
100 */
101 #define MMU_FTR_NO_SLBIE_B ASM_CONST(0x02000000)
102
103 /* Support 16M large pages
104 */
105 #define MMU_FTR_16M_PAGE ASM_CONST(0x04000000)
106
107 /* Supports TLBIEL variant
108 */
109 #define MMU_FTR_TLBIEL ASM_CONST(0x08000000)
110
111 /* Supports tlbies w/o locking
112 */
113 #define MMU_FTR_LOCKLESS_TLBIE ASM_CONST(0x10000000)
114
115 /* Large pages can be marked CI
116 */
117 #define MMU_FTR_CI_LARGE_PAGE ASM_CONST(0x20000000)
118
119 /* 1T segments available
120 */
121 #define MMU_FTR_1T_SEGMENT ASM_CONST(0x40000000)
122
123 // NX paste RMA reject in DSI
124 #define MMU_FTR_NX_DSI ASM_CONST(0x80000000)
125
126 /* MMU feature bit sets for various CPUs */
127 #define MMU_FTRS_DEFAULT_HPTE_ARCH_V2 (MMU_FTR_HPTE_TABLE | MMU_FTR_TLBIEL | MMU_FTR_16M_PAGE)
128 #define MMU_FTRS_POWER MMU_FTRS_DEFAULT_HPTE_ARCH_V2
129 #define MMU_FTRS_PPC970 MMU_FTRS_POWER | MMU_FTR_TLBIE_CROP_VA
130 #define MMU_FTRS_POWER5 MMU_FTRS_POWER | MMU_FTR_LOCKLESS_TLBIE
131 #define MMU_FTRS_POWER6 MMU_FTRS_POWER5 | MMU_FTR_KERNEL_RO | MMU_FTR_68_BIT_VA
132 #define MMU_FTRS_POWER7 MMU_FTRS_POWER6
133 #define MMU_FTRS_POWER8 MMU_FTRS_POWER6
134 #define MMU_FTRS_POWER9 MMU_FTRS_POWER6
135 #define MMU_FTRS_POWER10 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_40x
156 MMU_FTR_TYPE_40x |
157 #endif
158 #ifdef CONFIG_PPC_47x
159 MMU_FTR_TYPE_47x | MMU_FTR_USE_TLBIVAX_BCAST | MMU_FTR_LOCK_BCAST_INVAL |
160 #elif defined(CONFIG_44x)
161 MMU_FTR_TYPE_44x |
162 #endif
163 #ifdef CONFIG_PPC_E500
164 MMU_FTR_TYPE_FSL_E | MMU_FTR_BIG_PHYS | MMU_FTR_USE_TLBILX |
165 #endif
166 #ifdef CONFIG_PPC_BOOK3S_32
167 MMU_FTR_USE_HIGH_BATS |
168 #endif
169 #ifdef CONFIG_PPC_83xx
170 MMU_FTR_NEED_DTLB_SW_LRU |
171 #endif
172 #ifdef CONFIG_PPC_BOOK3S_64
173 MMU_FTR_KERNEL_RO |
174 #ifdef CONFIG_PPC_64S_HASH_MMU
175 MMU_FTR_NO_SLBIE_B | MMU_FTR_16M_PAGE | MMU_FTR_TLBIEL |
176 MMU_FTR_LOCKLESS_TLBIE | MMU_FTR_CI_LARGE_PAGE |
177 MMU_FTR_1T_SEGMENT | MMU_FTR_TLBIE_CROP_VA |
178 MMU_FTR_68_BIT_VA | MMU_FTR_HPTE_TABLE |
179 #endif
180 #ifdef CONFIG_PPC_RADIX_MMU
181 MMU_FTR_TYPE_RADIX |
182 MMU_FTR_GTSE | MMU_FTR_NX_DSI |
183 #endif /* CONFIG_PPC_RADIX_MMU */
184 #endif
185 #ifdef CONFIG_PPC_KUAP
186 MMU_FTR_KUAP |
187 #endif /* CONFIG_PPC_KUAP */
188 #ifdef CONFIG_PPC_MEM_KEYS
189 MMU_FTR_PKEY |
190 #endif
191 #ifdef CONFIG_PPC_KUEP
192 MMU_FTR_BOOK3S_KUEP |
193 #endif /* CONFIG_PPC_KUAP */
194
195 0,
196 };
197
198 #if defined(CONFIG_PPC_BOOK3S_604) && !defined(CONFIG_PPC_BOOK3S_603)
199 #define MMU_FTRS_ALWAYS MMU_FTR_HPTE_TABLE
200 #endif
201 #ifdef CONFIG_PPC_8xx
202 #define MMU_FTRS_ALWAYS MMU_FTR_TYPE_8xx
203 #endif
204 #ifdef CONFIG_40x
205 #define MMU_FTRS_ALWAYS MMU_FTR_TYPE_40x
206 #endif
207 #ifdef CONFIG_PPC_47x
208 #define MMU_FTRS_ALWAYS MMU_FTR_TYPE_47x
209 #elif defined(CONFIG_44x)
210 #define MMU_FTRS_ALWAYS MMU_FTR_TYPE_44x
211 #endif
212 #ifdef CONFIG_PPC_E500
213 #define MMU_FTRS_ALWAYS MMU_FTR_TYPE_FSL_E
214 #endif
215
216 /* BOOK3S_64 options */
217 #if defined(CONFIG_PPC_RADIX_MMU) && !defined(CONFIG_PPC_64S_HASH_MMU)
218 #define MMU_FTRS_ALWAYS MMU_FTR_TYPE_RADIX
219 #elif !defined(CONFIG_PPC_RADIX_MMU) && defined(CONFIG_PPC_64S_HASH_MMU)
220 #define MMU_FTRS_ALWAYS MMU_FTR_HPTE_TABLE
221 #endif
222
223 #ifndef MMU_FTRS_ALWAYS
224 #define MMU_FTRS_ALWAYS 0
225 #endif
226
early_mmu_has_feature(unsigned long feature)227 static __always_inline bool early_mmu_has_feature(unsigned long feature)
228 {
229 if (MMU_FTRS_ALWAYS & feature)
230 return true;
231
232 return !!(MMU_FTRS_POSSIBLE & cur_cpu_spec->mmu_features & feature);
233 }
234
235 #ifdef CONFIG_JUMP_LABEL_FEATURE_CHECKS
236 #include <linux/jump_label.h>
237
238 #define NUM_MMU_FTR_KEYS 32
239
240 extern struct static_key_true mmu_feature_keys[NUM_MMU_FTR_KEYS];
241
242 extern void mmu_feature_keys_init(void);
243
mmu_has_feature(unsigned long feature)244 static __always_inline bool mmu_has_feature(unsigned long feature)
245 {
246 int i;
247
248 #ifndef __clang__ /* clang can't cope with this */
249 BUILD_BUG_ON(!__builtin_constant_p(feature));
250 #endif
251
252 #ifdef CONFIG_JUMP_LABEL_FEATURE_CHECK_DEBUG
253 if (!static_key_initialized) {
254 printk("Warning! mmu_has_feature() used prior to jump label init!\n");
255 dump_stack();
256 return early_mmu_has_feature(feature);
257 }
258 #endif
259
260 if (MMU_FTRS_ALWAYS & feature)
261 return true;
262
263 if (!(MMU_FTRS_POSSIBLE & feature))
264 return false;
265
266 i = __builtin_ctzl(feature);
267 return static_branch_likely(&mmu_feature_keys[i]);
268 }
269
mmu_clear_feature(unsigned long feature)270 static inline void mmu_clear_feature(unsigned long feature)
271 {
272 int i;
273
274 i = __builtin_ctzl(feature);
275 cur_cpu_spec->mmu_features &= ~feature;
276 static_branch_disable(&mmu_feature_keys[i]);
277 }
278 #else
279
mmu_feature_keys_init(void)280 static inline void mmu_feature_keys_init(void)
281 {
282
283 }
284
mmu_has_feature(unsigned long feature)285 static __always_inline bool mmu_has_feature(unsigned long feature)
286 {
287 return early_mmu_has_feature(feature);
288 }
289
mmu_clear_feature(unsigned long feature)290 static inline void mmu_clear_feature(unsigned long feature)
291 {
292 cur_cpu_spec->mmu_features &= ~feature;
293 }
294 #endif /* CONFIG_JUMP_LABEL */
295
296 extern unsigned int __start___mmu_ftr_fixup, __stop___mmu_ftr_fixup;
297
298 #ifdef CONFIG_PPC64
299 /* This is our real memory area size on ppc64 server, on embedded, we
300 * make it match the size our of bolted TLB area
301 */
302 extern u64 ppc64_rma_size;
303
304 /* Cleanup function used by kexec */
305 extern void mmu_cleanup_all(void);
306 extern void radix__mmu_cleanup_all(void);
307
308 /* Functions for creating and updating partition table on POWER9 */
309 extern void mmu_partition_table_init(void);
310 extern void mmu_partition_table_set_entry(unsigned int lpid, unsigned long dw0,
311 unsigned long dw1, bool flush);
312 #endif /* CONFIG_PPC64 */
313
314 struct mm_struct;
315 #ifdef CONFIG_DEBUG_VM
316 extern void assert_pte_locked(struct mm_struct *mm, unsigned long addr);
317 #else /* CONFIG_DEBUG_VM */
assert_pte_locked(struct mm_struct * mm,unsigned long addr)318 static inline void assert_pte_locked(struct mm_struct *mm, unsigned long addr)
319 {
320 }
321 #endif /* !CONFIG_DEBUG_VM */
322
radix_enabled(void)323 static __always_inline bool radix_enabled(void)
324 {
325 return mmu_has_feature(MMU_FTR_TYPE_RADIX);
326 }
327
early_radix_enabled(void)328 static __always_inline bool early_radix_enabled(void)
329 {
330 return early_mmu_has_feature(MMU_FTR_TYPE_RADIX);
331 }
332
333 #ifdef CONFIG_STRICT_KERNEL_RWX
strict_kernel_rwx_enabled(void)334 static inline bool strict_kernel_rwx_enabled(void)
335 {
336 return rodata_enabled;
337 }
338 #else
strict_kernel_rwx_enabled(void)339 static inline bool strict_kernel_rwx_enabled(void)
340 {
341 return false;
342 }
343 #endif
344
strict_module_rwx_enabled(void)345 static inline bool strict_module_rwx_enabled(void)
346 {
347 return IS_ENABLED(CONFIG_STRICT_MODULE_RWX) && strict_kernel_rwx_enabled();
348 }
349 #endif /* !__ASSEMBLY__ */
350
351 /* The kernel use the constants below to index in the page sizes array.
352 * The use of fixed constants for this purpose is better for performances
353 * of the low level hash refill handlers.
354 *
355 * A non supported page size has a "shift" field set to 0
356 *
357 * Any new page size being implemented can get a new entry in here. Whether
358 * the kernel will use it or not is a different matter though. The actual page
359 * size used by hugetlbfs is not defined here and may be made variable
360 *
361 * Note: This array ended up being a false good idea as it's growing to the
362 * point where I wonder if we should replace it with something different,
363 * to think about, feedback welcome. --BenH.
364 */
365
366 /* These are #defines as they have to be used in assembly */
367 #define MMU_PAGE_4K 0
368 #define MMU_PAGE_16K 1
369 #define MMU_PAGE_64K 2
370 #define MMU_PAGE_64K_AP 3 /* "Admixed pages" (hash64 only) */
371 #define MMU_PAGE_256K 4
372 #define MMU_PAGE_512K 5
373 #define MMU_PAGE_1M 6
374 #define MMU_PAGE_2M 7
375 #define MMU_PAGE_4M 8
376 #define MMU_PAGE_8M 9
377 #define MMU_PAGE_16M 10
378 #define MMU_PAGE_64M 11
379 #define MMU_PAGE_256M 12
380 #define MMU_PAGE_1G 13
381 #define MMU_PAGE_16G 14
382 #define MMU_PAGE_64G 15
383
384 /*
385 * N.B. we need to change the type of hpte_page_sizes if this gets to be > 16
386 * Also we need to change he type of mm_context.low/high_slices_psize.
387 */
388 #define MMU_PAGE_COUNT 16
389
390 #ifdef CONFIG_PPC_BOOK3S_64
391 #include <asm/book3s/64/mmu.h>
392 #else /* CONFIG_PPC_BOOK3S_64 */
393
394 #ifndef __ASSEMBLY__
395 /* MMU initialization */
396 extern void early_init_mmu(void);
397 extern void early_init_mmu_secondary(void);
398 extern void setup_initial_memory_limit(phys_addr_t first_memblock_base,
399 phys_addr_t first_memblock_size);
mmu_early_init_devtree(void)400 static inline void mmu_early_init_devtree(void) { }
401
pkey_early_init_devtree(void)402 static inline void pkey_early_init_devtree(void) {}
403
404 extern void *abatron_pteptrs[2];
405 #endif /* __ASSEMBLY__ */
406 #endif
407
408 #if defined(CONFIG_PPC_BOOK3S_32)
409 /* 32-bit classic hash table MMU */
410 #include <asm/book3s/32/mmu-hash.h>
411 #elif defined(CONFIG_PPC_MMU_NOHASH)
412 #include <asm/nohash/mmu.h>
413 #endif
414
415 #if defined(CONFIG_FA_DUMP) || defined(CONFIG_PRESERVE_FA_DUMP)
416 #define __HAVE_ARCH_RESERVED_KERNEL_PAGES
417 #endif
418
419 #endif /* __KERNEL__ */
420 #endif /* _ASM_POWERPC_MMU_H_ */
421