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Linux/arch/sh/mm/pmb.c

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  1 /*
  2  * arch/sh/mm/pmb.c
  3  *
  4  * Privileged Space Mapping Buffer (PMB) Support.
  5  *
  6  * Copyright (C) 2005 - 2011  Paul Mundt
  7  * Copyright (C) 2010  Matt Fleming
  8  *
  9  * This file is subject to the terms and conditions of the GNU General Public
 10  * License.  See the file "COPYING" in the main directory of this archive
 11  * for more details.
 12  */
 13 #include <linux/init.h>
 14 #include <linux/kernel.h>
 15 #include <linux/syscore_ops.h>
 16 #include <linux/cpu.h>
 17 #include <linux/module.h>
 18 #include <linux/bitops.h>
 19 #include <linux/debugfs.h>
 20 #include <linux/fs.h>
 21 #include <linux/seq_file.h>
 22 #include <linux/err.h>
 23 #include <linux/io.h>
 24 #include <linux/spinlock.h>
 25 #include <linux/vmalloc.h>
 26 #include <asm/cacheflush.h>
 27 #include <asm/sizes.h>
 28 #include <asm/uaccess.h>
 29 #include <asm/pgtable.h>
 30 #include <asm/page.h>
 31 #include <asm/mmu.h>
 32 #include <asm/mmu_context.h>
 33 
 34 struct pmb_entry;
 35 
 36 struct pmb_entry {
 37         unsigned long vpn;
 38         unsigned long ppn;
 39         unsigned long flags;
 40         unsigned long size;
 41 
 42         raw_spinlock_t lock;
 43 
 44         /*
 45          * 0 .. NR_PMB_ENTRIES for specific entry selection, or
 46          * PMB_NO_ENTRY to search for a free one
 47          */
 48         int entry;
 49 
 50         /* Adjacent entry link for contiguous multi-entry mappings */
 51         struct pmb_entry *link;
 52 };
 53 
 54 static struct {
 55         unsigned long size;
 56         int flag;
 57 } pmb_sizes[] = {
 58         { .size = SZ_512M, .flag = PMB_SZ_512M, },
 59         { .size = SZ_128M, .flag = PMB_SZ_128M, },
 60         { .size = SZ_64M,  .flag = PMB_SZ_64M,  },
 61         { .size = SZ_16M,  .flag = PMB_SZ_16M,  },
 62 };
 63 
 64 static void pmb_unmap_entry(struct pmb_entry *, int depth);
 65 
 66 static DEFINE_RWLOCK(pmb_rwlock);
 67 static struct pmb_entry pmb_entry_list[NR_PMB_ENTRIES];
 68 static DECLARE_BITMAP(pmb_map, NR_PMB_ENTRIES);
 69 
 70 static unsigned int pmb_iomapping_enabled;
 71 
 72 static __always_inline unsigned long mk_pmb_entry(unsigned int entry)
 73 {
 74         return (entry & PMB_E_MASK) << PMB_E_SHIFT;
 75 }
 76 
 77 static __always_inline unsigned long mk_pmb_addr(unsigned int entry)
 78 {
 79         return mk_pmb_entry(entry) | PMB_ADDR;
 80 }
 81 
 82 static __always_inline unsigned long mk_pmb_data(unsigned int entry)
 83 {
 84         return mk_pmb_entry(entry) | PMB_DATA;
 85 }
 86 
 87 static __always_inline unsigned int pmb_ppn_in_range(unsigned long ppn)
 88 {
 89         return ppn >= __pa(memory_start) && ppn < __pa(memory_end);
 90 }
 91 
 92 /*
 93  * Ensure that the PMB entries match our cache configuration.
 94  *
 95  * When we are in 32-bit address extended mode, CCR.CB becomes
 96  * invalid, so care must be taken to manually adjust cacheable
 97  * translations.
 98  */
 99 static __always_inline unsigned long pmb_cache_flags(void)
100 {
101         unsigned long flags = 0;
102 
103 #if defined(CONFIG_CACHE_OFF)
104         flags |= PMB_WT | PMB_UB;
105 #elif defined(CONFIG_CACHE_WRITETHROUGH)
106         flags |= PMB_C | PMB_WT | PMB_UB;
107 #elif defined(CONFIG_CACHE_WRITEBACK)
108         flags |= PMB_C;
109 #endif
110 
111         return flags;
112 }
113 
114 /*
115  * Convert typical pgprot value to the PMB equivalent
116  */
117 static inline unsigned long pgprot_to_pmb_flags(pgprot_t prot)
118 {
119         unsigned long pmb_flags = 0;
120         u64 flags = pgprot_val(prot);
121 
122         if (flags & _PAGE_CACHABLE)
123                 pmb_flags |= PMB_C;
124         if (flags & _PAGE_WT)
125                 pmb_flags |= PMB_WT | PMB_UB;
126 
127         return pmb_flags;
128 }
129 
130 static inline bool pmb_can_merge(struct pmb_entry *a, struct pmb_entry *b)
131 {
132         return (b->vpn == (a->vpn + a->size)) &&
133                (b->ppn == (a->ppn + a->size)) &&
134                (b->flags == a->flags);
135 }
136 
137 static bool pmb_mapping_exists(unsigned long vaddr, phys_addr_t phys,
138                                unsigned long size)
139 {
140         int i;
141 
142         read_lock(&pmb_rwlock);
143 
144         for (i = 0; i < ARRAY_SIZE(pmb_entry_list); i++) {
145                 struct pmb_entry *pmbe, *iter;
146                 unsigned long span;
147 
148                 if (!test_bit(i, pmb_map))
149                         continue;
150 
151                 pmbe = &pmb_entry_list[i];
152 
153                 /*
154                  * See if VPN and PPN are bounded by an existing mapping.
155                  */
156                 if ((vaddr < pmbe->vpn) || (vaddr >= (pmbe->vpn + pmbe->size)))
157                         continue;
158                 if ((phys < pmbe->ppn) || (phys >= (pmbe->ppn + pmbe->size)))
159                         continue;
160 
161                 /*
162                  * Now see if we're in range of a simple mapping.
163                  */
164                 if (size <= pmbe->size) {
165                         read_unlock(&pmb_rwlock);
166                         return true;
167                 }
168 
169                 span = pmbe->size;
170 
171                 /*
172                  * Finally for sizes that involve compound mappings, walk
173                  * the chain.
174                  */
175                 for (iter = pmbe->link; iter; iter = iter->link)
176                         span += iter->size;
177 
178                 /*
179                  * Nothing else to do if the range requirements are met.
180                  */
181                 if (size <= span) {
182                         read_unlock(&pmb_rwlock);
183                         return true;
184                 }
185         }
186 
187         read_unlock(&pmb_rwlock);
188         return false;
189 }
190 
191 static bool pmb_size_valid(unsigned long size)
192 {
193         int i;
194 
195         for (i = 0; i < ARRAY_SIZE(pmb_sizes); i++)
196                 if (pmb_sizes[i].size == size)
197                         return true;
198 
199         return false;
200 }
201 
202 static inline bool pmb_addr_valid(unsigned long addr, unsigned long size)
203 {
204         return (addr >= P1SEG && (addr + size - 1) < P3SEG);
205 }
206 
207 static inline bool pmb_prot_valid(pgprot_t prot)
208 {
209         return (pgprot_val(prot) & _PAGE_USER) == 0;
210 }
211 
212 static int pmb_size_to_flags(unsigned long size)
213 {
214         int i;
215 
216         for (i = 0; i < ARRAY_SIZE(pmb_sizes); i++)
217                 if (pmb_sizes[i].size == size)
218                         return pmb_sizes[i].flag;
219 
220         return 0;
221 }
222 
223 static int pmb_alloc_entry(void)
224 {
225         int pos;
226 
227         pos = find_first_zero_bit(pmb_map, NR_PMB_ENTRIES);
228         if (pos >= 0 && pos < NR_PMB_ENTRIES)
229                 __set_bit(pos, pmb_map);
230         else
231                 pos = -ENOSPC;
232 
233         return pos;
234 }
235 
236 static struct pmb_entry *pmb_alloc(unsigned long vpn, unsigned long ppn,
237                                    unsigned long flags, int entry)
238 {
239         struct pmb_entry *pmbe;
240         unsigned long irqflags;
241         void *ret = NULL;
242         int pos;
243 
244         write_lock_irqsave(&pmb_rwlock, irqflags);
245 
246         if (entry == PMB_NO_ENTRY) {
247                 pos = pmb_alloc_entry();
248                 if (unlikely(pos < 0)) {
249                         ret = ERR_PTR(pos);
250                         goto out;
251                 }
252         } else {
253                 if (__test_and_set_bit(entry, pmb_map)) {
254                         ret = ERR_PTR(-ENOSPC);
255                         goto out;
256                 }
257 
258                 pos = entry;
259         }
260 
261         write_unlock_irqrestore(&pmb_rwlock, irqflags);
262 
263         pmbe = &pmb_entry_list[pos];
264 
265         memset(pmbe, 0, sizeof(struct pmb_entry));
266 
267         raw_spin_lock_init(&pmbe->lock);
268 
269         pmbe->vpn       = vpn;
270         pmbe->ppn       = ppn;
271         pmbe->flags     = flags;
272         pmbe->entry     = pos;
273 
274         return pmbe;
275 
276 out:
277         write_unlock_irqrestore(&pmb_rwlock, irqflags);
278         return ret;
279 }
280 
281 static void pmb_free(struct pmb_entry *pmbe)
282 {
283         __clear_bit(pmbe->entry, pmb_map);
284 
285         pmbe->entry     = PMB_NO_ENTRY;
286         pmbe->link      = NULL;
287 }
288 
289 /*
290  * Must be run uncached.
291  */
292 static void __set_pmb_entry(struct pmb_entry *pmbe)
293 {
294         unsigned long addr, data;
295 
296         addr = mk_pmb_addr(pmbe->entry);
297         data = mk_pmb_data(pmbe->entry);
298 
299         jump_to_uncached();
300 
301         /* Set V-bit */
302         __raw_writel(pmbe->vpn | PMB_V, addr);
303         __raw_writel(pmbe->ppn | pmbe->flags | PMB_V, data);
304 
305         back_to_cached();
306 }
307 
308 static void __clear_pmb_entry(struct pmb_entry *pmbe)
309 {
310         unsigned long addr, data;
311         unsigned long addr_val, data_val;
312 
313         addr = mk_pmb_addr(pmbe->entry);
314         data = mk_pmb_data(pmbe->entry);
315 
316         addr_val = __raw_readl(addr);
317         data_val = __raw_readl(data);
318 
319         /* Clear V-bit */
320         writel_uncached(addr_val & ~PMB_V, addr);
321         writel_uncached(data_val & ~PMB_V, data);
322 }
323 
324 #ifdef CONFIG_PM
325 static void set_pmb_entry(struct pmb_entry *pmbe)
326 {
327         unsigned long flags;
328 
329         raw_spin_lock_irqsave(&pmbe->lock, flags);
330         __set_pmb_entry(pmbe);
331         raw_spin_unlock_irqrestore(&pmbe->lock, flags);
332 }
333 #endif /* CONFIG_PM */
334 
335 int pmb_bolt_mapping(unsigned long vaddr, phys_addr_t phys,
336                      unsigned long size, pgprot_t prot)
337 {
338         struct pmb_entry *pmbp, *pmbe;
339         unsigned long orig_addr, orig_size;
340         unsigned long flags, pmb_flags;
341         int i, mapped;
342 
343         if (size < SZ_16M)
344                 return -EINVAL;
345         if (!pmb_addr_valid(vaddr, size))
346                 return -EFAULT;
347         if (pmb_mapping_exists(vaddr, phys, size))
348                 return 0;
349 
350         orig_addr = vaddr;
351         orig_size = size;
352 
353         flush_tlb_kernel_range(vaddr, vaddr + size);
354 
355         pmb_flags = pgprot_to_pmb_flags(prot);
356         pmbp = NULL;
357 
358         do {
359                 for (i = mapped = 0; i < ARRAY_SIZE(pmb_sizes); i++) {
360                         if (size < pmb_sizes[i].size)
361                                 continue;
362 
363                         pmbe = pmb_alloc(vaddr, phys, pmb_flags |
364                                          pmb_sizes[i].flag, PMB_NO_ENTRY);
365                         if (IS_ERR(pmbe)) {
366                                 pmb_unmap_entry(pmbp, mapped);
367                                 return PTR_ERR(pmbe);
368                         }
369 
370                         raw_spin_lock_irqsave(&pmbe->lock, flags);
371 
372                         pmbe->size = pmb_sizes[i].size;
373 
374                         __set_pmb_entry(pmbe);
375 
376                         phys    += pmbe->size;
377                         vaddr   += pmbe->size;
378                         size    -= pmbe->size;
379 
380                         /*
381                          * Link adjacent entries that span multiple PMB
382                          * entries for easier tear-down.
383                          */
384                         if (likely(pmbp)) {
385                                 raw_spin_lock_nested(&pmbp->lock,
386                                                      SINGLE_DEPTH_NESTING);
387                                 pmbp->link = pmbe;
388                                 raw_spin_unlock(&pmbp->lock);
389                         }
390 
391                         pmbp = pmbe;
392 
393                         /*
394                          * Instead of trying smaller sizes on every
395                          * iteration (even if we succeed in allocating
396                          * space), try using pmb_sizes[i].size again.
397                          */
398                         i--;
399                         mapped++;
400 
401                         raw_spin_unlock_irqrestore(&pmbe->lock, flags);
402                 }
403         } while (size >= SZ_16M);
404 
405         flush_cache_vmap(orig_addr, orig_addr + orig_size);
406 
407         return 0;
408 }
409 
410 void __iomem *pmb_remap_caller(phys_addr_t phys, unsigned long size,
411                                pgprot_t prot, void *caller)
412 {
413         unsigned long vaddr;
414         phys_addr_t offset, last_addr;
415         phys_addr_t align_mask;
416         unsigned long aligned;
417         struct vm_struct *area;
418         int i, ret;
419 
420         if (!pmb_iomapping_enabled)
421                 return NULL;
422 
423         /*
424          * Small mappings need to go through the TLB.
425          */
426         if (size < SZ_16M)
427                 return ERR_PTR(-EINVAL);
428         if (!pmb_prot_valid(prot))
429                 return ERR_PTR(-EINVAL);
430 
431         for (i = 0; i < ARRAY_SIZE(pmb_sizes); i++)
432                 if (size >= pmb_sizes[i].size)
433                         break;
434 
435         last_addr = phys + size;
436         align_mask = ~(pmb_sizes[i].size - 1);
437         offset = phys & ~align_mask;
438         phys &= align_mask;
439         aligned = ALIGN(last_addr, pmb_sizes[i].size) - phys;
440 
441         /*
442          * XXX: This should really start from uncached_end, but this
443          * causes the MMU to reset, so for now we restrict it to the
444          * 0xb000...0xc000 range.
445          */
446         area = __get_vm_area_caller(aligned, VM_IOREMAP, 0xb0000000,
447                                     P3SEG, caller);
448         if (!area)
449                 return NULL;
450 
451         area->phys_addr = phys;
452         vaddr = (unsigned long)area->addr;
453 
454         ret = pmb_bolt_mapping(vaddr, phys, size, prot);
455         if (unlikely(ret != 0))
456                 return ERR_PTR(ret);
457 
458         return (void __iomem *)(offset + (char *)vaddr);
459 }
460 
461 int pmb_unmap(void __iomem *addr)
462 {
463         struct pmb_entry *pmbe = NULL;
464         unsigned long vaddr = (unsigned long __force)addr;
465         int i, found = 0;
466 
467         read_lock(&pmb_rwlock);
468 
469         for (i = 0; i < ARRAY_SIZE(pmb_entry_list); i++) {
470                 if (test_bit(i, pmb_map)) {
471                         pmbe = &pmb_entry_list[i];
472                         if (pmbe->vpn == vaddr) {
473                                 found = 1;
474                                 break;
475                         }
476                 }
477         }
478 
479         read_unlock(&pmb_rwlock);
480 
481         if (found) {
482                 pmb_unmap_entry(pmbe, NR_PMB_ENTRIES);
483                 return 0;
484         }
485 
486         return -EINVAL;
487 }
488 
489 static void __pmb_unmap_entry(struct pmb_entry *pmbe, int depth)
490 {
491         do {
492                 struct pmb_entry *pmblink = pmbe;
493 
494                 /*
495                  * We may be called before this pmb_entry has been
496                  * entered into the PMB table via set_pmb_entry(), but
497                  * that's OK because we've allocated a unique slot for
498                  * this entry in pmb_alloc() (even if we haven't filled
499                  * it yet).
500                  *
501                  * Therefore, calling __clear_pmb_entry() is safe as no
502                  * other mapping can be using that slot.
503                  */
504                 __clear_pmb_entry(pmbe);
505 
506                 flush_cache_vunmap(pmbe->vpn, pmbe->vpn + pmbe->size);
507 
508                 pmbe = pmblink->link;
509 
510                 pmb_free(pmblink);
511         } while (pmbe && --depth);
512 }
513 
514 static void pmb_unmap_entry(struct pmb_entry *pmbe, int depth)
515 {
516         unsigned long flags;
517 
518         if (unlikely(!pmbe))
519                 return;
520 
521         write_lock_irqsave(&pmb_rwlock, flags);
522         __pmb_unmap_entry(pmbe, depth);
523         write_unlock_irqrestore(&pmb_rwlock, flags);
524 }
525 
526 static void __init pmb_notify(void)
527 {
528         int i;
529 
530         pr_info("PMB: boot mappings:\n");
531 
532         read_lock(&pmb_rwlock);
533 
534         for (i = 0; i < ARRAY_SIZE(pmb_entry_list); i++) {
535                 struct pmb_entry *pmbe;
536 
537                 if (!test_bit(i, pmb_map))
538                         continue;
539 
540                 pmbe = &pmb_entry_list[i];
541 
542                 pr_info("       0x%08lx -> 0x%08lx [ %4ldMB %2scached ]\n",
543                         pmbe->vpn >> PAGE_SHIFT, pmbe->ppn >> PAGE_SHIFT,
544                         pmbe->size >> 20, (pmbe->flags & PMB_C) ? "" : "un");
545         }
546 
547         read_unlock(&pmb_rwlock);
548 }
549 
550 /*
551  * Sync our software copy of the PMB mappings with those in hardware. The
552  * mappings in the hardware PMB were either set up by the bootloader or
553  * very early on by the kernel.
554  */
555 static void __init pmb_synchronize(void)
556 {
557         struct pmb_entry *pmbp = NULL;
558         int i, j;
559 
560         /*
561          * Run through the initial boot mappings, log the established
562          * ones, and blow away anything that falls outside of the valid
563          * PPN range. Specifically, we only care about existing mappings
564          * that impact the cached/uncached sections.
565          *
566          * Note that touching these can be a bit of a minefield; the boot
567          * loader can establish multi-page mappings with the same caching
568          * attributes, so we need to ensure that we aren't modifying a
569          * mapping that we're presently executing from, or may execute
570          * from in the case of straddling page boundaries.
571          *
572          * In the future we will have to tidy up after the boot loader by
573          * jumping between the cached and uncached mappings and tearing
574          * down alternating mappings while executing from the other.
575          */
576         for (i = 0; i < NR_PMB_ENTRIES; i++) {
577                 unsigned long addr, data;
578                 unsigned long addr_val, data_val;
579                 unsigned long ppn, vpn, flags;
580                 unsigned long irqflags;
581                 unsigned int size;
582                 struct pmb_entry *pmbe;
583 
584                 addr = mk_pmb_addr(i);
585                 data = mk_pmb_data(i);
586 
587                 addr_val = __raw_readl(addr);
588                 data_val = __raw_readl(data);
589 
590                 /*
591                  * Skip over any bogus entries
592                  */
593                 if (!(data_val & PMB_V) || !(addr_val & PMB_V))
594                         continue;
595 
596                 ppn = data_val & PMB_PFN_MASK;
597                 vpn = addr_val & PMB_PFN_MASK;
598 
599                 /*
600                  * Only preserve in-range mappings.
601                  */
602                 if (!pmb_ppn_in_range(ppn)) {
603                         /*
604                          * Invalidate anything out of bounds.
605                          */
606                         writel_uncached(addr_val & ~PMB_V, addr);
607                         writel_uncached(data_val & ~PMB_V, data);
608                         continue;
609                 }
610 
611                 /*
612                  * Update the caching attributes if necessary
613                  */
614                 if (data_val & PMB_C) {
615                         data_val &= ~PMB_CACHE_MASK;
616                         data_val |= pmb_cache_flags();
617 
618                         writel_uncached(data_val, data);
619                 }
620 
621                 size = data_val & PMB_SZ_MASK;
622                 flags = size | (data_val & PMB_CACHE_MASK);
623 
624                 pmbe = pmb_alloc(vpn, ppn, flags, i);
625                 if (IS_ERR(pmbe)) {
626                         WARN_ON_ONCE(1);
627                         continue;
628                 }
629 
630                 raw_spin_lock_irqsave(&pmbe->lock, irqflags);
631 
632                 for (j = 0; j < ARRAY_SIZE(pmb_sizes); j++)
633                         if (pmb_sizes[j].flag == size)
634                                 pmbe->size = pmb_sizes[j].size;
635 
636                 if (pmbp) {
637                         raw_spin_lock_nested(&pmbp->lock, SINGLE_DEPTH_NESTING);
638                         /*
639                          * Compare the previous entry against the current one to
640                          * see if the entries span a contiguous mapping. If so,
641                          * setup the entry links accordingly. Compound mappings
642                          * are later coalesced.
643                          */
644                         if (pmb_can_merge(pmbp, pmbe))
645                                 pmbp->link = pmbe;
646                         raw_spin_unlock(&pmbp->lock);
647                 }
648 
649                 pmbp = pmbe;
650 
651                 raw_spin_unlock_irqrestore(&pmbe->lock, irqflags);
652         }
653 }
654 
655 static void __init pmb_merge(struct pmb_entry *head)
656 {
657         unsigned long span, newsize;
658         struct pmb_entry *tail;
659         int i = 1, depth = 0;
660 
661         span = newsize = head->size;
662 
663         tail = head->link;
664         while (tail) {
665                 span += tail->size;
666 
667                 if (pmb_size_valid(span)) {
668                         newsize = span;
669                         depth = i;
670                 }
671 
672                 /* This is the end of the line.. */
673                 if (!tail->link)
674                         break;
675 
676                 tail = tail->link;
677                 i++;
678         }
679 
680         /*
681          * The merged page size must be valid.
682          */
683         if (!depth || !pmb_size_valid(newsize))
684                 return;
685 
686         head->flags &= ~PMB_SZ_MASK;
687         head->flags |= pmb_size_to_flags(newsize);
688 
689         head->size = newsize;
690 
691         __pmb_unmap_entry(head->link, depth);
692         __set_pmb_entry(head);
693 }
694 
695 static void __init pmb_coalesce(void)
696 {
697         unsigned long flags;
698         int i;
699 
700         write_lock_irqsave(&pmb_rwlock, flags);
701 
702         for (i = 0; i < ARRAY_SIZE(pmb_entry_list); i++) {
703                 struct pmb_entry *pmbe;
704 
705                 if (!test_bit(i, pmb_map))
706                         continue;
707 
708                 pmbe = &pmb_entry_list[i];
709 
710                 /*
711                  * We're only interested in compound mappings
712                  */
713                 if (!pmbe->link)
714                         continue;
715 
716                 /*
717                  * Nothing to do if it already uses the largest possible
718                  * page size.
719                  */
720                 if (pmbe->size == SZ_512M)
721                         continue;
722 
723                 pmb_merge(pmbe);
724         }
725 
726         write_unlock_irqrestore(&pmb_rwlock, flags);
727 }
728 
729 #ifdef CONFIG_UNCACHED_MAPPING
730 static void __init pmb_resize(void)
731 {
732         int i;
733 
734         /*
735          * If the uncached mapping was constructed by the kernel, it will
736          * already be a reasonable size.
737          */
738         if (uncached_size == SZ_16M)
739                 return;
740 
741         read_lock(&pmb_rwlock);
742 
743         for (i = 0; i < ARRAY_SIZE(pmb_entry_list); i++) {
744                 struct pmb_entry *pmbe;
745                 unsigned long flags;
746 
747                 if (!test_bit(i, pmb_map))
748                         continue;
749 
750                 pmbe = &pmb_entry_list[i];
751 
752                 if (pmbe->vpn != uncached_start)
753                         continue;
754 
755                 /*
756                  * Found it, now resize it.
757                  */
758                 raw_spin_lock_irqsave(&pmbe->lock, flags);
759 
760                 pmbe->size = SZ_16M;
761                 pmbe->flags &= ~PMB_SZ_MASK;
762                 pmbe->flags |= pmb_size_to_flags(pmbe->size);
763 
764                 uncached_resize(pmbe->size);
765 
766                 __set_pmb_entry(pmbe);
767 
768                 raw_spin_unlock_irqrestore(&pmbe->lock, flags);
769         }
770 
771         read_unlock(&pmb_rwlock);
772 }
773 #endif
774 
775 static int __init early_pmb(char *p)
776 {
777         if (!p)
778                 return 0;
779 
780         if (strstr(p, "iomap"))
781                 pmb_iomapping_enabled = 1;
782 
783         return 0;
784 }
785 early_param("pmb", early_pmb);
786 
787 void __init pmb_init(void)
788 {
789         /* Synchronize software state */
790         pmb_synchronize();
791 
792         /* Attempt to combine compound mappings */
793         pmb_coalesce();
794 
795 #ifdef CONFIG_UNCACHED_MAPPING
796         /* Resize initial mappings, if necessary */
797         pmb_resize();
798 #endif
799 
800         /* Log them */
801         pmb_notify();
802 
803         writel_uncached(0, PMB_IRMCR);
804 
805         /* Flush out the TLB */
806         local_flush_tlb_all();
807         ctrl_barrier();
808 }
809 
810 bool __in_29bit_mode(void)
811 {
812         return (__raw_readl(PMB_PASCR) & PASCR_SE) == 0;
813 }
814 
815 static int pmb_seq_show(struct seq_file *file, void *iter)
816 {
817         int i;
818 
819         seq_printf(file, "V: Valid, C: Cacheable, WT: Write-Through\n"
820                          "CB: Copy-Back, B: Buffered, UB: Unbuffered\n");
821         seq_printf(file, "ety   vpn  ppn  size   flags\n");
822 
823         for (i = 0; i < NR_PMB_ENTRIES; i++) {
824                 unsigned long addr, data;
825                 unsigned int size;
826                 char *sz_str = NULL;
827 
828                 addr = __raw_readl(mk_pmb_addr(i));
829                 data = __raw_readl(mk_pmb_data(i));
830 
831                 size = data & PMB_SZ_MASK;
832                 sz_str = (size == PMB_SZ_16M)  ? " 16MB":
833                          (size == PMB_SZ_64M)  ? " 64MB":
834                          (size == PMB_SZ_128M) ? "128MB":
835                                                  "512MB";
836 
837                 /* 02: V 0x88 0x08 128MB C CB  B */
838                 seq_printf(file, "%02d: %c 0x%02lx 0x%02lx %s %c %s %s\n",
839                            i, ((addr & PMB_V) && (data & PMB_V)) ? 'V' : ' ',
840                            (addr >> 24) & 0xff, (data >> 24) & 0xff,
841                            sz_str, (data & PMB_C) ? 'C' : ' ',
842                            (data & PMB_WT) ? "WT" : "CB",
843                            (data & PMB_UB) ? "UB" : " B");
844         }
845 
846         return 0;
847 }
848 
849 static int pmb_debugfs_open(struct inode *inode, struct file *file)
850 {
851         return single_open(file, pmb_seq_show, NULL);
852 }
853 
854 static const struct file_operations pmb_debugfs_fops = {
855         .owner          = THIS_MODULE,
856         .open           = pmb_debugfs_open,
857         .read           = seq_read,
858         .llseek         = seq_lseek,
859         .release        = single_release,
860 };
861 
862 static int __init pmb_debugfs_init(void)
863 {
864         struct dentry *dentry;
865 
866         dentry = debugfs_create_file("pmb", S_IFREG | S_IRUGO,
867                                      arch_debugfs_dir, NULL, &pmb_debugfs_fops);
868         if (!dentry)
869                 return -ENOMEM;
870 
871         return 0;
872 }
873 subsys_initcall(pmb_debugfs_init);
874 
875 #ifdef CONFIG_PM
876 static void pmb_syscore_resume(void)
877 {
878         struct pmb_entry *pmbe;
879         int i;
880 
881         read_lock(&pmb_rwlock);
882 
883         for (i = 0; i < ARRAY_SIZE(pmb_entry_list); i++) {
884                 if (test_bit(i, pmb_map)) {
885                         pmbe = &pmb_entry_list[i];
886                         set_pmb_entry(pmbe);
887                 }
888         }
889 
890         read_unlock(&pmb_rwlock);
891 }
892 
893 static struct syscore_ops pmb_syscore_ops = {
894         .resume = pmb_syscore_resume,
895 };
896 
897 static int __init pmb_sysdev_init(void)
898 {
899         register_syscore_ops(&pmb_syscore_ops);
900         return 0;
901 }
902 subsys_initcall(pmb_sysdev_init);
903 #endif
904 

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