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f048aace BH |
1 | /* |
2 | * This file contains the routines for TLB flushing. | |
3 | * On machines where the MMU does not use a hash table to store virtual to | |
4 | * physical translations (ie, SW loaded TLBs or Book3E compilant processors, | |
5 | * this does -not- include 603 however which shares the implementation with | |
6 | * hash based processors) | |
7 | * | |
8 | * -- BenH | |
9 | * | |
25d21ad6 BH |
10 | * Copyright 2008,2009 Ben Herrenschmidt <benh@kernel.crashing.org> |
11 | * IBM Corp. | |
f048aace BH |
12 | * |
13 | * Derived from arch/ppc/mm/init.c: | |
14 | * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) | |
15 | * | |
16 | * Modifications by Paul Mackerras (PowerMac) (paulus@cs.anu.edu.au) | |
17 | * and Cort Dougan (PReP) (cort@cs.nmt.edu) | |
18 | * Copyright (C) 1996 Paul Mackerras | |
19 | * | |
20 | * Derived from "arch/i386/mm/init.c" | |
21 | * Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds | |
22 | * | |
23 | * This program is free software; you can redistribute it and/or | |
24 | * modify it under the terms of the GNU General Public License | |
25 | * as published by the Free Software Foundation; either version | |
26 | * 2 of the License, or (at your option) any later version. | |
27 | * | |
28 | */ | |
29 | ||
30 | #include <linux/kernel.h> | |
93087948 | 31 | #include <linux/export.h> |
f048aace BH |
32 | #include <linux/mm.h> |
33 | #include <linux/init.h> | |
34 | #include <linux/highmem.h> | |
35 | #include <linux/pagemap.h> | |
36 | #include <linux/preempt.h> | |
37 | #include <linux/spinlock.h> | |
95f72d1e | 38 | #include <linux/memblock.h> |
91b191c7 | 39 | #include <linux/of_fdt.h> |
41151e77 | 40 | #include <linux/hugetlb.h> |
f048aace BH |
41 | |
42 | #include <asm/tlbflush.h> | |
43 | #include <asm/tlb.h> | |
25d21ad6 | 44 | #include <asm/code-patching.h> |
41151e77 | 45 | #include <asm/hugetlb.h> |
28efc35f | 46 | #include <asm/paca.h> |
f048aace BH |
47 | |
48 | #include "mmu_decl.h" | |
49 | ||
41151e77 BB |
50 | /* |
51 | * This struct lists the sw-supported page sizes. The hardawre MMU may support | |
52 | * other sizes not listed here. The .ind field is only used on MMUs that have | |
53 | * indirect page table entries. | |
54 | */ | |
55 | #ifdef CONFIG_PPC_BOOK3E_MMU | |
881fde1d | 56 | #ifdef CONFIG_PPC_FSL_BOOK3E |
41151e77 BB |
57 | struct mmu_psize_def mmu_psize_defs[MMU_PAGE_COUNT] = { |
58 | [MMU_PAGE_4K] = { | |
59 | .shift = 12, | |
60 | .enc = BOOK3E_PAGESZ_4K, | |
61 | }, | |
28efc35f SW |
62 | [MMU_PAGE_2M] = { |
63 | .shift = 21, | |
64 | .enc = BOOK3E_PAGESZ_2M, | |
65 | }, | |
41151e77 BB |
66 | [MMU_PAGE_4M] = { |
67 | .shift = 22, | |
68 | .enc = BOOK3E_PAGESZ_4M, | |
69 | }, | |
70 | [MMU_PAGE_16M] = { | |
71 | .shift = 24, | |
72 | .enc = BOOK3E_PAGESZ_16M, | |
73 | }, | |
74 | [MMU_PAGE_64M] = { | |
75 | .shift = 26, | |
76 | .enc = BOOK3E_PAGESZ_64M, | |
77 | }, | |
78 | [MMU_PAGE_256M] = { | |
79 | .shift = 28, | |
80 | .enc = BOOK3E_PAGESZ_256M, | |
81 | }, | |
82 | [MMU_PAGE_1G] = { | |
83 | .shift = 30, | |
84 | .enc = BOOK3E_PAGESZ_1GB, | |
85 | }, | |
86 | }; | |
87 | #else | |
25d21ad6 BH |
88 | struct mmu_psize_def mmu_psize_defs[MMU_PAGE_COUNT] = { |
89 | [MMU_PAGE_4K] = { | |
90 | .shift = 12, | |
f2b26c92 | 91 | .ind = 20, |
25d21ad6 BH |
92 | .enc = BOOK3E_PAGESZ_4K, |
93 | }, | |
94 | [MMU_PAGE_16K] = { | |
95 | .shift = 14, | |
96 | .enc = BOOK3E_PAGESZ_16K, | |
97 | }, | |
98 | [MMU_PAGE_64K] = { | |
99 | .shift = 16, | |
f2b26c92 | 100 | .ind = 28, |
25d21ad6 BH |
101 | .enc = BOOK3E_PAGESZ_64K, |
102 | }, | |
103 | [MMU_PAGE_1M] = { | |
104 | .shift = 20, | |
105 | .enc = BOOK3E_PAGESZ_1M, | |
106 | }, | |
107 | [MMU_PAGE_16M] = { | |
108 | .shift = 24, | |
f2b26c92 | 109 | .ind = 36, |
25d21ad6 BH |
110 | .enc = BOOK3E_PAGESZ_16M, |
111 | }, | |
112 | [MMU_PAGE_256M] = { | |
113 | .shift = 28, | |
114 | .enc = BOOK3E_PAGESZ_256M, | |
115 | }, | |
116 | [MMU_PAGE_1G] = { | |
117 | .shift = 30, | |
118 | .enc = BOOK3E_PAGESZ_1GB, | |
119 | }, | |
120 | }; | |
41151e77 BB |
121 | #endif /* CONFIG_FSL_BOOKE */ |
122 | ||
25d21ad6 BH |
123 | static inline int mmu_get_tsize(int psize) |
124 | { | |
125 | return mmu_psize_defs[psize].enc; | |
126 | } | |
127 | #else | |
128 | static inline int mmu_get_tsize(int psize) | |
129 | { | |
130 | /* This isn't used on !Book3E for now */ | |
131 | return 0; | |
132 | } | |
41151e77 | 133 | #endif /* CONFIG_PPC_BOOK3E_MMU */ |
25d21ad6 BH |
134 | |
135 | /* The variables below are currently only used on 64-bit Book3E | |
136 | * though this will probably be made common with other nohash | |
137 | * implementations at some point | |
138 | */ | |
139 | #ifdef CONFIG_PPC64 | |
140 | ||
141 | int mmu_linear_psize; /* Page size used for the linear mapping */ | |
142 | int mmu_pte_psize; /* Page size used for PTE pages */ | |
32a74949 | 143 | int mmu_vmemmap_psize; /* Page size used for the virtual mem map */ |
28efc35f | 144 | int book3e_htw_mode; /* HW tablewalk? Value is PPC_HTW_* */ |
25d21ad6 BH |
145 | unsigned long linear_map_top; /* Top of linear mapping */ |
146 | ||
609af38f SW |
147 | |
148 | /* | |
149 | * Number of bytes to add to SPRN_SPRG_TLB_EXFRAME on crit/mcheck/debug | |
150 | * exceptions. This is used for bolted and e6500 TLB miss handlers which | |
151 | * do not modify this SPRG in the TLB miss code; for other TLB miss handlers, | |
152 | * this is set to zero. | |
153 | */ | |
154 | int extlb_level_exc; | |
155 | ||
25d21ad6 BH |
156 | #endif /* CONFIG_PPC64 */ |
157 | ||
3160b097 BB |
158 | #ifdef CONFIG_PPC_FSL_BOOK3E |
159 | /* next_tlbcam_idx is used to round-robin tlbcam entry assignment */ | |
160 | DEFINE_PER_CPU(int, next_tlbcam_idx); | |
161 | EXPORT_PER_CPU_SYMBOL(next_tlbcam_idx); | |
162 | #endif | |
163 | ||
f048aace BH |
164 | /* |
165 | * Base TLB flushing operations: | |
166 | * | |
167 | * - flush_tlb_mm(mm) flushes the specified mm context TLB's | |
168 | * - flush_tlb_page(vma, vmaddr) flushes one page | |
169 | * - flush_tlb_range(vma, start, end) flushes a range of pages | |
170 | * - flush_tlb_kernel_range(start, end) flushes kernel pages | |
171 | * | |
172 | * - local_* variants of page and mm only apply to the current | |
173 | * processor | |
174 | */ | |
175 | ||
176 | /* | |
177 | * These are the base non-SMP variants of page and mm flushing | |
178 | */ | |
179 | void local_flush_tlb_mm(struct mm_struct *mm) | |
180 | { | |
181 | unsigned int pid; | |
182 | ||
183 | preempt_disable(); | |
184 | pid = mm->context.id; | |
185 | if (pid != MMU_NO_CONTEXT) | |
186 | _tlbil_pid(pid); | |
187 | preempt_enable(); | |
188 | } | |
189 | EXPORT_SYMBOL(local_flush_tlb_mm); | |
190 | ||
d4e167da BH |
191 | void __local_flush_tlb_page(struct mm_struct *mm, unsigned long vmaddr, |
192 | int tsize, int ind) | |
f048aace BH |
193 | { |
194 | unsigned int pid; | |
195 | ||
196 | preempt_disable(); | |
d4e167da | 197 | pid = mm ? mm->context.id : 0; |
f048aace | 198 | if (pid != MMU_NO_CONTEXT) |
d4e167da | 199 | _tlbil_va(vmaddr, pid, tsize, ind); |
f048aace BH |
200 | preempt_enable(); |
201 | } | |
f048aace | 202 | |
d4e167da BH |
203 | void local_flush_tlb_page(struct vm_area_struct *vma, unsigned long vmaddr) |
204 | { | |
205 | __local_flush_tlb_page(vma ? vma->vm_mm : NULL, vmaddr, | |
25d21ad6 | 206 | mmu_get_tsize(mmu_virtual_psize), 0); |
d4e167da BH |
207 | } |
208 | EXPORT_SYMBOL(local_flush_tlb_page); | |
f048aace BH |
209 | |
210 | /* | |
211 | * And here are the SMP non-local implementations | |
212 | */ | |
213 | #ifdef CONFIG_SMP | |
214 | ||
3eb93c55 | 215 | static DEFINE_RAW_SPINLOCK(tlbivax_lock); |
f048aace | 216 | |
fcce8109 BH |
217 | static int mm_is_core_local(struct mm_struct *mm) |
218 | { | |
219 | return cpumask_subset(mm_cpumask(mm), | |
220 | topology_thread_cpumask(smp_processor_id())); | |
221 | } | |
222 | ||
f048aace BH |
223 | struct tlb_flush_param { |
224 | unsigned long addr; | |
225 | unsigned int pid; | |
d4e167da BH |
226 | unsigned int tsize; |
227 | unsigned int ind; | |
f048aace BH |
228 | }; |
229 | ||
230 | static void do_flush_tlb_mm_ipi(void *param) | |
231 | { | |
232 | struct tlb_flush_param *p = param; | |
233 | ||
234 | _tlbil_pid(p ? p->pid : 0); | |
235 | } | |
236 | ||
237 | static void do_flush_tlb_page_ipi(void *param) | |
238 | { | |
239 | struct tlb_flush_param *p = param; | |
240 | ||
d4e167da | 241 | _tlbil_va(p->addr, p->pid, p->tsize, p->ind); |
f048aace BH |
242 | } |
243 | ||
244 | ||
245 | /* Note on invalidations and PID: | |
246 | * | |
247 | * We snapshot the PID with preempt disabled. At this point, it can still | |
248 | * change either because: | |
249 | * - our context is being stolen (PID -> NO_CONTEXT) on another CPU | |
250 | * - we are invaliating some target that isn't currently running here | |
251 | * and is concurrently acquiring a new PID on another CPU | |
252 | * - some other CPU is re-acquiring a lost PID for this mm | |
253 | * etc... | |
254 | * | |
255 | * However, this shouldn't be a problem as we only guarantee | |
256 | * invalidation of TLB entries present prior to this call, so we | |
257 | * don't care about the PID changing, and invalidating a stale PID | |
258 | * is generally harmless. | |
259 | */ | |
260 | ||
261 | void flush_tlb_mm(struct mm_struct *mm) | |
262 | { | |
f048aace BH |
263 | unsigned int pid; |
264 | ||
265 | preempt_disable(); | |
266 | pid = mm->context.id; | |
267 | if (unlikely(pid == MMU_NO_CONTEXT)) | |
268 | goto no_context; | |
fcce8109 | 269 | if (!mm_is_core_local(mm)) { |
f048aace | 270 | struct tlb_flush_param p = { .pid = pid }; |
56aa4129 RR |
271 | /* Ignores smp_processor_id() even if set. */ |
272 | smp_call_function_many(mm_cpumask(mm), | |
273 | do_flush_tlb_mm_ipi, &p, 1); | |
f048aace BH |
274 | } |
275 | _tlbil_pid(pid); | |
276 | no_context: | |
277 | preempt_enable(); | |
278 | } | |
279 | EXPORT_SYMBOL(flush_tlb_mm); | |
280 | ||
d4e167da BH |
281 | void __flush_tlb_page(struct mm_struct *mm, unsigned long vmaddr, |
282 | int tsize, int ind) | |
f048aace | 283 | { |
56aa4129 | 284 | struct cpumask *cpu_mask; |
f048aace BH |
285 | unsigned int pid; |
286 | ||
287 | preempt_disable(); | |
d4e167da | 288 | pid = mm ? mm->context.id : 0; |
f048aace BH |
289 | if (unlikely(pid == MMU_NO_CONTEXT)) |
290 | goto bail; | |
d4e167da | 291 | cpu_mask = mm_cpumask(mm); |
fcce8109 | 292 | if (!mm_is_core_local(mm)) { |
f048aace BH |
293 | /* If broadcast tlbivax is supported, use it */ |
294 | if (mmu_has_feature(MMU_FTR_USE_TLBIVAX_BCAST)) { | |
295 | int lock = mmu_has_feature(MMU_FTR_LOCK_BCAST_INVAL); | |
296 | if (lock) | |
3eb93c55 | 297 | raw_spin_lock(&tlbivax_lock); |
d4e167da | 298 | _tlbivax_bcast(vmaddr, pid, tsize, ind); |
f048aace | 299 | if (lock) |
3eb93c55 | 300 | raw_spin_unlock(&tlbivax_lock); |
f048aace BH |
301 | goto bail; |
302 | } else { | |
d4e167da BH |
303 | struct tlb_flush_param p = { |
304 | .pid = pid, | |
305 | .addr = vmaddr, | |
306 | .tsize = tsize, | |
307 | .ind = ind, | |
308 | }; | |
56aa4129 RR |
309 | /* Ignores smp_processor_id() even if set in cpu_mask */ |
310 | smp_call_function_many(cpu_mask, | |
f048aace BH |
311 | do_flush_tlb_page_ipi, &p, 1); |
312 | } | |
313 | } | |
d4e167da | 314 | _tlbil_va(vmaddr, pid, tsize, ind); |
f048aace BH |
315 | bail: |
316 | preempt_enable(); | |
317 | } | |
d4e167da BH |
318 | |
319 | void flush_tlb_page(struct vm_area_struct *vma, unsigned long vmaddr) | |
320 | { | |
41151e77 | 321 | #ifdef CONFIG_HUGETLB_PAGE |
d742aa15 | 322 | if (vma && is_vm_hugetlb_page(vma)) |
41151e77 BB |
323 | flush_hugetlb_page(vma, vmaddr); |
324 | #endif | |
325 | ||
d4e167da | 326 | __flush_tlb_page(vma ? vma->vm_mm : NULL, vmaddr, |
25d21ad6 | 327 | mmu_get_tsize(mmu_virtual_psize), 0); |
d4e167da | 328 | } |
f048aace BH |
329 | EXPORT_SYMBOL(flush_tlb_page); |
330 | ||
331 | #endif /* CONFIG_SMP */ | |
332 | ||
91b191c7 DK |
333 | #ifdef CONFIG_PPC_47x |
334 | void __init early_init_mmu_47x(void) | |
335 | { | |
336 | #ifdef CONFIG_SMP | |
337 | unsigned long root = of_get_flat_dt_root(); | |
338 | if (of_get_flat_dt_prop(root, "cooperative-partition", NULL)) | |
339 | mmu_clear_feature(MMU_FTR_USE_TLBIVAX_BCAST); | |
340 | #endif /* CONFIG_SMP */ | |
341 | } | |
342 | #endif /* CONFIG_PPC_47x */ | |
343 | ||
f048aace BH |
344 | /* |
345 | * Flush kernel TLB entries in the given range | |
346 | */ | |
347 | void flush_tlb_kernel_range(unsigned long start, unsigned long end) | |
348 | { | |
349 | #ifdef CONFIG_SMP | |
350 | preempt_disable(); | |
351 | smp_call_function(do_flush_tlb_mm_ipi, NULL, 1); | |
352 | _tlbil_pid(0); | |
353 | preempt_enable(); | |
d6a09e0c | 354 | #else |
f048aace | 355 | _tlbil_pid(0); |
d6a09e0c | 356 | #endif |
f048aace BH |
357 | } |
358 | EXPORT_SYMBOL(flush_tlb_kernel_range); | |
359 | ||
360 | /* | |
361 | * Currently, for range flushing, we just do a full mm flush. This should | |
362 | * be optimized based on a threshold on the size of the range, since | |
363 | * some implementation can stack multiple tlbivax before a tlbsync but | |
364 | * for now, we keep it that way | |
365 | */ | |
366 | void flush_tlb_range(struct vm_area_struct *vma, unsigned long start, | |
367 | unsigned long end) | |
368 | ||
369 | { | |
370 | flush_tlb_mm(vma->vm_mm); | |
371 | } | |
372 | EXPORT_SYMBOL(flush_tlb_range); | |
c7cc58a1 BH |
373 | |
374 | void tlb_flush(struct mmu_gather *tlb) | |
375 | { | |
376 | flush_tlb_mm(tlb->mm); | |
c7cc58a1 | 377 | } |
25d21ad6 BH |
378 | |
379 | /* | |
380 | * Below are functions specific to the 64-bit variant of Book3E though that | |
381 | * may change in the future | |
382 | */ | |
383 | ||
384 | #ifdef CONFIG_PPC64 | |
385 | ||
386 | /* | |
387 | * Handling of virtual linear page tables or indirect TLB entries | |
388 | * flushing when PTE pages are freed | |
389 | */ | |
390 | void tlb_flush_pgtable(struct mmu_gather *tlb, unsigned long address) | |
391 | { | |
392 | int tsize = mmu_psize_defs[mmu_pte_psize].enc; | |
393 | ||
28efc35f | 394 | if (book3e_htw_mode != PPC_HTW_NONE) { |
25d21ad6 BH |
395 | unsigned long start = address & PMD_MASK; |
396 | unsigned long end = address + PMD_SIZE; | |
397 | unsigned long size = 1UL << mmu_psize_defs[mmu_pte_psize].shift; | |
398 | ||
399 | /* This isn't the most optimal, ideally we would factor out the | |
400 | * while preempt & CPU mask mucking around, or even the IPI but | |
401 | * it will do for now | |
402 | */ | |
403 | while (start < end) { | |
404 | __flush_tlb_page(tlb->mm, start, tsize, 1); | |
405 | start += size; | |
406 | } | |
407 | } else { | |
408 | unsigned long rmask = 0xf000000000000000ul; | |
409 | unsigned long rid = (address & rmask) | 0x1000000000000000ul; | |
410 | unsigned long vpte = address & ~rmask; | |
411 | ||
412 | #ifdef CONFIG_PPC_64K_PAGES | |
413 | vpte = (vpte >> (PAGE_SHIFT - 4)) & ~0xfffful; | |
414 | #else | |
415 | vpte = (vpte >> (PAGE_SHIFT - 3)) & ~0xffful; | |
416 | #endif | |
417 | vpte |= rid; | |
418 | __flush_tlb_page(tlb->mm, vpte, tsize, 0); | |
419 | } | |
420 | } | |
421 | ||
f2b26c92 BH |
422 | static void setup_page_sizes(void) |
423 | { | |
988cf86d KG |
424 | unsigned int tlb0cfg; |
425 | unsigned int tlb0ps; | |
426 | unsigned int eptcfg; | |
f2b26c92 BH |
427 | int i, psize; |
428 | ||
988cf86d KG |
429 | #ifdef CONFIG_PPC_FSL_BOOK3E |
430 | unsigned int mmucfg = mfspr(SPRN_MMUCFG); | |
1b291873 | 431 | int fsl_mmu = mmu_has_feature(MMU_FTR_TYPE_FSL_E); |
988cf86d | 432 | |
1b291873 | 433 | if (fsl_mmu && (mmucfg & MMUCFG_MAVN) == MMUCFG_MAVN_V1) { |
988cf86d KG |
434 | unsigned int tlb1cfg = mfspr(SPRN_TLB1CFG); |
435 | unsigned int min_pg, max_pg; | |
436 | ||
437 | min_pg = (tlb1cfg & TLBnCFG_MINSIZE) >> TLBnCFG_MINSIZE_SHIFT; | |
438 | max_pg = (tlb1cfg & TLBnCFG_MAXSIZE) >> TLBnCFG_MAXSIZE_SHIFT; | |
439 | ||
440 | for (psize = 0; psize < MMU_PAGE_COUNT; ++psize) { | |
441 | struct mmu_psize_def *def; | |
442 | unsigned int shift; | |
443 | ||
444 | def = &mmu_psize_defs[psize]; | |
445 | shift = def->shift; | |
446 | ||
28efc35f | 447 | if (shift == 0 || shift & 1) |
988cf86d KG |
448 | continue; |
449 | ||
450 | /* adjust to be in terms of 4^shift Kb */ | |
451 | shift = (shift - 10) >> 1; | |
452 | ||
453 | if ((shift >= min_pg) && (shift <= max_pg)) | |
454 | def->flags |= MMU_PAGE_SIZE_DIRECT; | |
455 | } | |
456 | ||
28efc35f | 457 | goto out; |
988cf86d | 458 | } |
1b291873 KG |
459 | |
460 | if (fsl_mmu && (mmucfg & MMUCFG_MAVN) == MMUCFG_MAVN_V2) { | |
28efc35f SW |
461 | u32 tlb1cfg, tlb1ps; |
462 | ||
463 | tlb0cfg = mfspr(SPRN_TLB0CFG); | |
464 | tlb1cfg = mfspr(SPRN_TLB1CFG); | |
465 | tlb1ps = mfspr(SPRN_TLB1PS); | |
466 | eptcfg = mfspr(SPRN_EPTCFG); | |
467 | ||
468 | if ((tlb1cfg & TLBnCFG_IND) && (tlb0cfg & TLBnCFG_PT)) | |
469 | book3e_htw_mode = PPC_HTW_E6500; | |
470 | ||
471 | /* | |
472 | * We expect 4K subpage size and unrestricted indirect size. | |
473 | * The lack of a restriction on indirect size is a Freescale | |
474 | * extension, indicated by PSn = 0 but SPSn != 0. | |
475 | */ | |
476 | if (eptcfg != 2) | |
477 | book3e_htw_mode = PPC_HTW_NONE; | |
1b291873 KG |
478 | |
479 | for (psize = 0; psize < MMU_PAGE_COUNT; ++psize) { | |
480 | struct mmu_psize_def *def = &mmu_psize_defs[psize]; | |
481 | ||
482 | if (tlb1ps & (1U << (def->shift - 10))) { | |
483 | def->flags |= MMU_PAGE_SIZE_DIRECT; | |
28efc35f SW |
484 | |
485 | if (book3e_htw_mode && psize == MMU_PAGE_2M) | |
486 | def->flags |= MMU_PAGE_SIZE_INDIRECT; | |
1b291873 KG |
487 | } |
488 | } | |
489 | ||
28efc35f | 490 | goto out; |
1b291873 | 491 | } |
988cf86d KG |
492 | #endif |
493 | ||
494 | tlb0cfg = mfspr(SPRN_TLB0CFG); | |
495 | tlb0ps = mfspr(SPRN_TLB0PS); | |
496 | eptcfg = mfspr(SPRN_EPTCFG); | |
497 | ||
f2b26c92 BH |
498 | /* Look for supported direct sizes */ |
499 | for (psize = 0; psize < MMU_PAGE_COUNT; ++psize) { | |
500 | struct mmu_psize_def *def = &mmu_psize_defs[psize]; | |
501 | ||
502 | if (tlb0ps & (1U << (def->shift - 10))) | |
503 | def->flags |= MMU_PAGE_SIZE_DIRECT; | |
504 | } | |
505 | ||
506 | /* Indirect page sizes supported ? */ | |
28efc35f SW |
507 | if ((tlb0cfg & TLBnCFG_IND) == 0 || |
508 | (tlb0cfg & TLBnCFG_PT) == 0) | |
509 | goto out; | |
510 | ||
511 | book3e_htw_mode = PPC_HTW_IBM; | |
f2b26c92 BH |
512 | |
513 | /* Now, we only deal with one IND page size for each | |
514 | * direct size. Hopefully all implementations today are | |
515 | * unambiguous, but we might want to be careful in the | |
516 | * future. | |
517 | */ | |
518 | for (i = 0; i < 3; i++) { | |
519 | unsigned int ps, sps; | |
520 | ||
521 | sps = eptcfg & 0x1f; | |
522 | eptcfg >>= 5; | |
523 | ps = eptcfg & 0x1f; | |
524 | eptcfg >>= 5; | |
525 | if (!ps || !sps) | |
526 | continue; | |
527 | for (psize = 0; psize < MMU_PAGE_COUNT; psize++) { | |
528 | struct mmu_psize_def *def = &mmu_psize_defs[psize]; | |
529 | ||
530 | if (ps == (def->shift - 10)) | |
531 | def->flags |= MMU_PAGE_SIZE_INDIRECT; | |
532 | if (sps == (def->shift - 10)) | |
533 | def->ind = ps + 10; | |
534 | } | |
535 | } | |
f2b26c92 | 536 | |
28efc35f | 537 | out: |
f2b26c92 BH |
538 | /* Cleanup array and print summary */ |
539 | pr_info("MMU: Supported page sizes\n"); | |
540 | for (psize = 0; psize < MMU_PAGE_COUNT; ++psize) { | |
541 | struct mmu_psize_def *def = &mmu_psize_defs[psize]; | |
542 | const char *__page_type_names[] = { | |
543 | "unsupported", | |
544 | "direct", | |
545 | "indirect", | |
546 | "direct & indirect" | |
547 | }; | |
548 | if (def->flags == 0) { | |
549 | def->shift = 0; | |
550 | continue; | |
551 | } | |
552 | pr_info(" %8ld KB as %s\n", 1ul << (def->shift - 10), | |
553 | __page_type_names[def->flags & 0x3]); | |
554 | } | |
555 | } | |
556 | ||
f67f4ef5 SW |
557 | static void setup_mmu_htw(void) |
558 | { | |
28efc35f SW |
559 | /* |
560 | * If we want to use HW tablewalk, enable it by patching the TLB miss | |
561 | * handlers to branch to the one dedicated to it. | |
562 | */ | |
563 | ||
564 | switch (book3e_htw_mode) { | |
565 | case PPC_HTW_IBM: | |
f67f4ef5 SW |
566 | patch_exception(0x1c0, exc_data_tlb_miss_htw_book3e); |
567 | patch_exception(0x1e0, exc_instruction_tlb_miss_htw_book3e); | |
28efc35f | 568 | break; |
9841c79c | 569 | #ifdef CONFIG_PPC_FSL_BOOK3E |
28efc35f | 570 | case PPC_HTW_E6500: |
609af38f | 571 | extlb_level_exc = EX_TLB_SIZE; |
28efc35f SW |
572 | patch_exception(0x1c0, exc_data_tlb_miss_e6500_book3e); |
573 | patch_exception(0x1e0, exc_instruction_tlb_miss_e6500_book3e); | |
574 | break; | |
9841c79c | 575 | #endif |
f2b26c92 | 576 | } |
32d206eb | 577 | pr_info("MMU: Book3E HW tablewalk %s\n", |
28efc35f | 578 | book3e_htw_mode != PPC_HTW_NONE ? "enabled" : "not supported"); |
f2b26c92 BH |
579 | } |
580 | ||
581 | /* | |
582 | * Early initialization of the MMU TLB code | |
583 | */ | |
584 | static void __early_init_mmu(int boot_cpu) | |
585 | { | |
25d21ad6 BH |
586 | unsigned int mas4; |
587 | ||
588 | /* XXX This will have to be decided at runtime, but right | |
32a74949 BH |
589 | * now our boot and TLB miss code hard wires it. Ideally |
590 | * we should find out a suitable page size and patch the | |
591 | * TLB miss code (either that or use the PACA to store | |
592 | * the value we want) | |
25d21ad6 BH |
593 | */ |
594 | mmu_linear_psize = MMU_PAGE_1G; | |
595 | ||
32a74949 BH |
596 | /* XXX This should be decided at runtime based on supported |
597 | * page sizes in the TLB, but for now let's assume 16M is | |
598 | * always there and a good fit (which it probably is) | |
e57eeae4 SW |
599 | * |
600 | * Freescale booke only supports 4K pages in TLB0, so use that. | |
32a74949 | 601 | */ |
e57eeae4 SW |
602 | if (mmu_has_feature(MMU_FTR_TYPE_FSL_E)) |
603 | mmu_vmemmap_psize = MMU_PAGE_4K; | |
604 | else | |
605 | mmu_vmemmap_psize = MMU_PAGE_16M; | |
25d21ad6 | 606 | |
25d21ad6 BH |
607 | /* XXX This code only checks for TLB 0 capabilities and doesn't |
608 | * check what page size combos are supported by the HW. It | |
609 | * also doesn't handle the case where a separate array holds | |
610 | * the IND entries from the array loaded by the PT. | |
611 | */ | |
612 | if (boot_cpu) { | |
f2b26c92 BH |
613 | /* Look for supported page sizes */ |
614 | setup_page_sizes(); | |
25d21ad6 | 615 | |
f2b26c92 BH |
616 | /* Look for HW tablewalk support */ |
617 | setup_mmu_htw(); | |
25d21ad6 BH |
618 | } |
619 | ||
620 | /* Set MAS4 based on page table setting */ | |
621 | ||
622 | mas4 = 0x4 << MAS4_WIMGED_SHIFT; | |
28efc35f SW |
623 | switch (book3e_htw_mode) { |
624 | case PPC_HTW_E6500: | |
625 | mas4 |= MAS4_INDD; | |
626 | mas4 |= BOOK3E_PAGESZ_2M << MAS4_TSIZED_SHIFT; | |
627 | mas4 |= MAS4_TLBSELD(1); | |
628 | mmu_pte_psize = MMU_PAGE_2M; | |
629 | break; | |
630 | ||
631 | case PPC_HTW_IBM: | |
632 | mas4 |= MAS4_INDD; | |
25d21ad6 BH |
633 | #ifdef CONFIG_PPC_64K_PAGES |
634 | mas4 |= BOOK3E_PAGESZ_256M << MAS4_TSIZED_SHIFT; | |
635 | mmu_pte_psize = MMU_PAGE_256M; | |
636 | #else | |
637 | mas4 |= BOOK3E_PAGESZ_1M << MAS4_TSIZED_SHIFT; | |
638 | mmu_pte_psize = MMU_PAGE_1M; | |
639 | #endif | |
28efc35f SW |
640 | break; |
641 | ||
642 | case PPC_HTW_NONE: | |
25d21ad6 BH |
643 | #ifdef CONFIG_PPC_64K_PAGES |
644 | mas4 |= BOOK3E_PAGESZ_64K << MAS4_TSIZED_SHIFT; | |
645 | #else | |
646 | mas4 |= BOOK3E_PAGESZ_4K << MAS4_TSIZED_SHIFT; | |
647 | #endif | |
648 | mmu_pte_psize = mmu_virtual_psize; | |
28efc35f | 649 | break; |
25d21ad6 BH |
650 | } |
651 | mtspr(SPRN_MAS4, mas4); | |
652 | ||
653 | /* Set the global containing the top of the linear mapping | |
654 | * for use by the TLB miss code | |
655 | */ | |
95f72d1e | 656 | linear_map_top = memblock_end_of_DRAM(); |
25d21ad6 | 657 | |
55fd766b KG |
658 | #ifdef CONFIG_PPC_FSL_BOOK3E |
659 | if (mmu_has_feature(MMU_FTR_TYPE_FSL_E)) { | |
660 | unsigned int num_cams; | |
661 | ||
662 | /* use a quarter of the TLBCAM for bolted linear map */ | |
663 | num_cams = (mfspr(SPRN_TLB1CFG) & TLBnCFG_N_ENTRY) / 4; | |
664 | linear_map_top = map_mem_in_cams(linear_map_top, num_cams); | |
665 | ||
666 | /* limit memory so we dont have linear faults */ | |
667 | memblock_enforce_memory_limit(linear_map_top); | |
f67f4ef5 | 668 | |
28efc35f | 669 | if (book3e_htw_mode == PPC_HTW_NONE) { |
609af38f | 670 | extlb_level_exc = EX_TLB_SIZE; |
28efc35f SW |
671 | patch_exception(0x1c0, exc_data_tlb_miss_bolted_book3e); |
672 | patch_exception(0x1e0, | |
673 | exc_instruction_tlb_miss_bolted_book3e); | |
674 | } | |
55fd766b KG |
675 | } |
676 | #endif | |
677 | ||
25d21ad6 BH |
678 | /* A sync won't hurt us after mucking around with |
679 | * the MMU configuration | |
680 | */ | |
681 | mb(); | |
e63075a3 BH |
682 | |
683 | memblock_set_current_limit(linear_map_top); | |
25d21ad6 BH |
684 | } |
685 | ||
686 | void __init early_init_mmu(void) | |
687 | { | |
688 | __early_init_mmu(1); | |
689 | } | |
690 | ||
061d19f2 | 691 | void early_init_mmu_secondary(void) |
25d21ad6 BH |
692 | { |
693 | __early_init_mmu(0); | |
694 | } | |
695 | ||
cd3db0c4 BH |
696 | void setup_initial_memory_limit(phys_addr_t first_memblock_base, |
697 | phys_addr_t first_memblock_size) | |
698 | { | |
1dc91c3e | 699 | /* On non-FSL Embedded 64-bit, we adjust the RMA size to match |
cd3db0c4 BH |
700 | * the bolted TLB entry. We know for now that only 1G |
701 | * entries are supported though that may eventually | |
1dc91c3e KG |
702 | * change. |
703 | * | |
704 | * on FSL Embedded 64-bit, we adjust the RMA size to match the | |
705 | * first bolted TLB entry size. We still limit max to 1G even if | |
706 | * the TLB could cover more. This is due to what the early init | |
707 | * code is setup to do. | |
708 | * | |
709 | * We crop it to the size of the first MEMBLOCK to | |
cd3db0c4 BH |
710 | * avoid going over total available memory just in case... |
711 | */ | |
1dc91c3e KG |
712 | #ifdef CONFIG_PPC_FSL_BOOK3E |
713 | if (mmu_has_feature(MMU_FTR_TYPE_FSL_E)) { | |
714 | unsigned long linear_sz; | |
715 | linear_sz = calc_cam_sz(first_memblock_size, PAGE_OFFSET, | |
716 | first_memblock_base); | |
717 | ppc64_rma_size = min_t(u64, linear_sz, 0x40000000); | |
718 | } else | |
719 | #endif | |
720 | ppc64_rma_size = min_t(u64, first_memblock_size, 0x40000000); | |
cd3db0c4 BH |
721 | |
722 | /* Finally limit subsequent allocations */ | |
4a89261b | 723 | memblock_set_current_limit(first_memblock_base + ppc64_rma_size); |
cd3db0c4 | 724 | } |
91b191c7 DK |
725 | #else /* ! CONFIG_PPC64 */ |
726 | void __init early_init_mmu(void) | |
727 | { | |
728 | #ifdef CONFIG_PPC_47x | |
729 | early_init_mmu_47x(); | |
730 | #endif | |
731 | } | |
25d21ad6 | 732 | #endif /* CONFIG_PPC64 */ |