sh: Flush executable pages in copy_user_highpage
[linux-2.6.git] / arch / sh / mm / cache.c
1 /*
2  * arch/sh/mm/cache.c
3  *
4  * Copyright (C) 1999, 2000, 2002  Niibe Yutaka
5  * Copyright (C) 2002 - 2010  Paul Mundt
6  *
7  * Released under the terms of the GNU GPL v2.0.
8  */
9 #include <linux/mm.h>
10 #include <linux/init.h>
11 #include <linux/mutex.h>
12 #include <linux/fs.h>
13 #include <linux/smp.h>
14 #include <linux/highmem.h>
15 #include <linux/module.h>
16 #include <asm/mmu_context.h>
17 #include <asm/cacheflush.h>
18
19 void (*local_flush_cache_all)(void *args) = cache_noop;
20 void (*local_flush_cache_mm)(void *args) = cache_noop;
21 void (*local_flush_cache_dup_mm)(void *args) = cache_noop;
22 void (*local_flush_cache_page)(void *args) = cache_noop;
23 void (*local_flush_cache_range)(void *args) = cache_noop;
24 void (*local_flush_dcache_page)(void *args) = cache_noop;
25 void (*local_flush_icache_range)(void *args) = cache_noop;
26 void (*local_flush_icache_page)(void *args) = cache_noop;
27 void (*local_flush_cache_sigtramp)(void *args) = cache_noop;
28
29 void (*__flush_wback_region)(void *start, int size);
30 EXPORT_SYMBOL(__flush_wback_region);
31 void (*__flush_purge_region)(void *start, int size);
32 EXPORT_SYMBOL(__flush_purge_region);
33 void (*__flush_invalidate_region)(void *start, int size);
34 EXPORT_SYMBOL(__flush_invalidate_region);
35
36 static inline void noop__flush_region(void *start, int size)
37 {
38 }
39
40 static inline void cacheop_on_each_cpu(void (*func) (void *info), void *info,
41                                    int wait)
42 {
43         preempt_disable();
44
45         /*
46          * It's possible that this gets called early on when IRQs are
47          * still disabled due to ioremapping by the boot CPU, so don't
48          * even attempt IPIs unless there are other CPUs online.
49          */
50         if (num_online_cpus() > 1)
51                 smp_call_function(func, info, wait);
52
53         func(info);
54
55         preempt_enable();
56 }
57
58 void copy_to_user_page(struct vm_area_struct *vma, struct page *page,
59                        unsigned long vaddr, void *dst, const void *src,
60                        unsigned long len)
61 {
62         if (boot_cpu_data.dcache.n_aliases && page_mapped(page) &&
63             test_bit(PG_dcache_clean, &page->flags)) {
64                 void *vto = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK);
65                 memcpy(vto, src, len);
66                 kunmap_coherent(vto);
67         } else {
68                 memcpy(dst, src, len);
69                 if (boot_cpu_data.dcache.n_aliases)
70                         clear_bit(PG_dcache_clean, &page->flags);
71         }
72
73         if (vma->vm_flags & VM_EXEC)
74                 flush_cache_page(vma, vaddr, page_to_pfn(page));
75 }
76
77 void copy_from_user_page(struct vm_area_struct *vma, struct page *page,
78                          unsigned long vaddr, void *dst, const void *src,
79                          unsigned long len)
80 {
81         if (boot_cpu_data.dcache.n_aliases && page_mapped(page) &&
82             test_bit(PG_dcache_clean, &page->flags)) {
83                 void *vfrom = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK);
84                 memcpy(dst, vfrom, len);
85                 kunmap_coherent(vfrom);
86         } else {
87                 memcpy(dst, src, len);
88                 if (boot_cpu_data.dcache.n_aliases)
89                         clear_bit(PG_dcache_clean, &page->flags);
90         }
91 }
92
93 void copy_user_highpage(struct page *to, struct page *from,
94                         unsigned long vaddr, struct vm_area_struct *vma)
95 {
96         void *vfrom, *vto;
97
98         vto = kmap_atomic(to, KM_USER1);
99
100         if (boot_cpu_data.dcache.n_aliases && page_mapped(from) &&
101             test_bit(PG_dcache_clean, &from->flags)) {
102                 vfrom = kmap_coherent(from, vaddr);
103                 copy_page(vto, vfrom);
104                 kunmap_coherent(vfrom);
105         } else {
106                 vfrom = kmap_atomic(from, KM_USER0);
107                 copy_page(vto, vfrom);
108                 kunmap_atomic(vfrom, KM_USER0);
109         }
110
111         if (pages_do_alias((unsigned long)vto, vaddr & PAGE_MASK) ||
112             (vma->vm_flags & VM_EXEC))
113                 __flush_purge_region(vto, PAGE_SIZE);
114
115         kunmap_atomic(vto, KM_USER1);
116         /* Make sure this page is cleared on other CPU's too before using it */
117         smp_wmb();
118 }
119 EXPORT_SYMBOL(copy_user_highpage);
120
121 void clear_user_highpage(struct page *page, unsigned long vaddr)
122 {
123         void *kaddr = kmap_atomic(page, KM_USER0);
124
125         clear_page(kaddr);
126
127         if (pages_do_alias((unsigned long)kaddr, vaddr & PAGE_MASK))
128                 __flush_purge_region(kaddr, PAGE_SIZE);
129
130         kunmap_atomic(kaddr, KM_USER0);
131 }
132 EXPORT_SYMBOL(clear_user_highpage);
133
134 void __update_cache(struct vm_area_struct *vma,
135                     unsigned long address, pte_t pte)
136 {
137         struct page *page;
138         unsigned long pfn = pte_pfn(pte);
139
140         if (!boot_cpu_data.dcache.n_aliases)
141                 return;
142
143         page = pfn_to_page(pfn);
144         if (pfn_valid(pfn)) {
145                 int dirty = !test_and_set_bit(PG_dcache_clean, &page->flags);
146                 if (dirty)
147                         __flush_purge_region(page_address(page), PAGE_SIZE);
148         }
149 }
150
151 void __flush_anon_page(struct page *page, unsigned long vmaddr)
152 {
153         unsigned long addr = (unsigned long) page_address(page);
154
155         if (pages_do_alias(addr, vmaddr)) {
156                 if (boot_cpu_data.dcache.n_aliases && page_mapped(page) &&
157                     test_bit(PG_dcache_clean, &page->flags)) {
158                         void *kaddr;
159
160                         kaddr = kmap_coherent(page, vmaddr);
161                         /* XXX.. For now kunmap_coherent() does a purge */
162                         /* __flush_purge_region((void *)kaddr, PAGE_SIZE); */
163                         kunmap_coherent(kaddr);
164                 } else
165                         __flush_purge_region((void *)addr, PAGE_SIZE);
166         }
167 }
168
169 void flush_cache_all(void)
170 {
171         cacheop_on_each_cpu(local_flush_cache_all, NULL, 1);
172 }
173 EXPORT_SYMBOL(flush_cache_all);
174
175 void flush_cache_mm(struct mm_struct *mm)
176 {
177         if (boot_cpu_data.dcache.n_aliases == 0)
178                 return;
179
180         cacheop_on_each_cpu(local_flush_cache_mm, mm, 1);
181 }
182
183 void flush_cache_dup_mm(struct mm_struct *mm)
184 {
185         if (boot_cpu_data.dcache.n_aliases == 0)
186                 return;
187
188         cacheop_on_each_cpu(local_flush_cache_dup_mm, mm, 1);
189 }
190
191 void flush_cache_page(struct vm_area_struct *vma, unsigned long addr,
192                       unsigned long pfn)
193 {
194         struct flusher_data data;
195
196         data.vma = vma;
197         data.addr1 = addr;
198         data.addr2 = pfn;
199
200         cacheop_on_each_cpu(local_flush_cache_page, (void *)&data, 1);
201 }
202
203 void flush_cache_range(struct vm_area_struct *vma, unsigned long start,
204                        unsigned long end)
205 {
206         struct flusher_data data;
207
208         data.vma = vma;
209         data.addr1 = start;
210         data.addr2 = end;
211
212         cacheop_on_each_cpu(local_flush_cache_range, (void *)&data, 1);
213 }
214 EXPORT_SYMBOL(flush_cache_range);
215
216 void flush_dcache_page(struct page *page)
217 {
218         cacheop_on_each_cpu(local_flush_dcache_page, page, 1);
219 }
220 EXPORT_SYMBOL(flush_dcache_page);
221
222 void flush_icache_range(unsigned long start, unsigned long end)
223 {
224         struct flusher_data data;
225
226         data.vma = NULL;
227         data.addr1 = start;
228         data.addr2 = end;
229
230         cacheop_on_each_cpu(local_flush_icache_range, (void *)&data, 1);
231 }
232
233 void flush_icache_page(struct vm_area_struct *vma, struct page *page)
234 {
235         /* Nothing uses the VMA, so just pass the struct page along */
236         cacheop_on_each_cpu(local_flush_icache_page, page, 1);
237 }
238
239 void flush_cache_sigtramp(unsigned long address)
240 {
241         cacheop_on_each_cpu(local_flush_cache_sigtramp, (void *)address, 1);
242 }
243
244 static void compute_alias(struct cache_info *c)
245 {
246         c->alias_mask = ((c->sets - 1) << c->entry_shift) & ~(PAGE_SIZE - 1);
247         c->n_aliases = c->alias_mask ? (c->alias_mask >> PAGE_SHIFT) + 1 : 0;
248 }
249
250 static void __init emit_cache_params(void)
251 {
252         printk(KERN_NOTICE "I-cache : n_ways=%d n_sets=%d way_incr=%d\n",
253                 boot_cpu_data.icache.ways,
254                 boot_cpu_data.icache.sets,
255                 boot_cpu_data.icache.way_incr);
256         printk(KERN_NOTICE "I-cache : entry_mask=0x%08x alias_mask=0x%08x n_aliases=%d\n",
257                 boot_cpu_data.icache.entry_mask,
258                 boot_cpu_data.icache.alias_mask,
259                 boot_cpu_data.icache.n_aliases);
260         printk(KERN_NOTICE "D-cache : n_ways=%d n_sets=%d way_incr=%d\n",
261                 boot_cpu_data.dcache.ways,
262                 boot_cpu_data.dcache.sets,
263                 boot_cpu_data.dcache.way_incr);
264         printk(KERN_NOTICE "D-cache : entry_mask=0x%08x alias_mask=0x%08x n_aliases=%d\n",
265                 boot_cpu_data.dcache.entry_mask,
266                 boot_cpu_data.dcache.alias_mask,
267                 boot_cpu_data.dcache.n_aliases);
268
269         /*
270          * Emit Secondary Cache parameters if the CPU has a probed L2.
271          */
272         if (boot_cpu_data.flags & CPU_HAS_L2_CACHE) {
273                 printk(KERN_NOTICE "S-cache : n_ways=%d n_sets=%d way_incr=%d\n",
274                         boot_cpu_data.scache.ways,
275                         boot_cpu_data.scache.sets,
276                         boot_cpu_data.scache.way_incr);
277                 printk(KERN_NOTICE "S-cache : entry_mask=0x%08x alias_mask=0x%08x n_aliases=%d\n",
278                         boot_cpu_data.scache.entry_mask,
279                         boot_cpu_data.scache.alias_mask,
280                         boot_cpu_data.scache.n_aliases);
281         }
282 }
283
284 void __init cpu_cache_init(void)
285 {
286         unsigned int cache_disabled = 0;
287
288 #ifdef CCR
289         cache_disabled = !(__raw_readl(CCR) & CCR_CACHE_ENABLE);
290 #endif
291
292         compute_alias(&boot_cpu_data.icache);
293         compute_alias(&boot_cpu_data.dcache);
294         compute_alias(&boot_cpu_data.scache);
295
296         __flush_wback_region            = noop__flush_region;
297         __flush_purge_region            = noop__flush_region;
298         __flush_invalidate_region       = noop__flush_region;
299
300         /*
301          * No flushing is necessary in the disabled cache case so we can
302          * just keep the noop functions in local_flush_..() and __flush_..()
303          */
304         if (unlikely(cache_disabled))
305                 goto skip;
306
307         if (boot_cpu_data.family == CPU_FAMILY_SH2) {
308                 extern void __weak sh2_cache_init(void);
309
310                 sh2_cache_init();
311         }
312
313         if (boot_cpu_data.family == CPU_FAMILY_SH2A) {
314                 extern void __weak sh2a_cache_init(void);
315
316                 sh2a_cache_init();
317         }
318
319         if (boot_cpu_data.family == CPU_FAMILY_SH3) {
320                 extern void __weak sh3_cache_init(void);
321
322                 sh3_cache_init();
323
324                 if ((boot_cpu_data.type == CPU_SH7705) &&
325                     (boot_cpu_data.dcache.sets == 512)) {
326                         extern void __weak sh7705_cache_init(void);
327
328                         sh7705_cache_init();
329                 }
330         }
331
332         if ((boot_cpu_data.family == CPU_FAMILY_SH4) ||
333             (boot_cpu_data.family == CPU_FAMILY_SH4A) ||
334             (boot_cpu_data.family == CPU_FAMILY_SH4AL_DSP)) {
335                 extern void __weak sh4_cache_init(void);
336
337                 sh4_cache_init();
338
339                 if ((boot_cpu_data.type == CPU_SH7786) ||
340                     (boot_cpu_data.type == CPU_SHX3)) {
341                         extern void __weak shx3_cache_init(void);
342
343                         shx3_cache_init();
344                 }
345         }
346
347         if (boot_cpu_data.family == CPU_FAMILY_SH5) {
348                 extern void __weak sh5_cache_init(void);
349
350                 sh5_cache_init();
351         }
352
353 skip:
354         emit_cache_params();
355 }