1 /*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Copyright (C) 1999-2006 Helge Deller <deller@gmx.de> (07-13-1999)
7 * Copyright (C) 1999 SuSE GmbH Nuernberg
8 * Copyright (C) 2000 Philipp Rumpf (prumpf@tux.org)
9 *
10 * Cache and TLB management
11 *
12 */
13
14 #include <linux/init.h>
15 #include <linux/kernel.h>
16 #include <linux/mm.h>
17 #include <linux/module.h>
18 #include <linux/seq_file.h>
19 #include <linux/pagemap.h>
20 #include <linux/sched.h>
21 #include <asm/pdc.h>
22 #include <asm/cache.h>
23 #include <asm/cacheflush.h>
24 #include <asm/tlbflush.h>
25 #include <asm/page.h>
26 #include <asm/pgalloc.h>
27 #include <asm/processor.h>
28 #include <asm/sections.h>
29 #include <asm/shmparam.h>
30
31 int split_tlb __read_mostly;
32 int dcache_stride __read_mostly;
33 int icache_stride __read_mostly;
34 EXPORT_SYMBOL(dcache_stride);
35
36 void flush_dcache_page_asm(unsigned long phys_addr, unsigned long vaddr);
37 EXPORT_SYMBOL(flush_dcache_page_asm);
38 void flush_icache_page_asm(unsigned long phys_addr, unsigned long vaddr);
39
40
41 /* On some machines (e.g. ones with the Merced bus), there can be
42 * only a single PxTLB broadcast at a time; this must be guaranteed
43 * by software. We put a spinlock around all TLB flushes to
44 * ensure this.
45 */
46 DEFINE_SPINLOCK(pa_tlb_lock);
47
48 struct pdc_cache_info cache_info __read_mostly;
49 #ifndef CONFIG_PA20
50 static struct pdc_btlb_info btlb_info __read_mostly;
51 #endif
52
53 #ifdef CONFIG_SMP
54 void
flush_data_cache(void)55 flush_data_cache(void)
56 {
57 on_each_cpu(flush_data_cache_local, NULL, 1);
58 }
59 void
flush_instruction_cache(void)60 flush_instruction_cache(void)
61 {
62 on_each_cpu(flush_instruction_cache_local, NULL, 1);
63 }
64 #endif
65
66 void
flush_cache_all_local(void)67 flush_cache_all_local(void)
68 {
69 flush_instruction_cache_local(NULL);
70 flush_data_cache_local(NULL);
71 }
72 EXPORT_SYMBOL(flush_cache_all_local);
73
74 void
update_mmu_cache(struct vm_area_struct * vma,unsigned long address,pte_t * ptep)75 update_mmu_cache(struct vm_area_struct *vma, unsigned long address, pte_t *ptep)
76 {
77 struct page *page = pte_page(*ptep);
78
79 if (pfn_valid(page_to_pfn(page)) && page_mapping(page) &&
80 test_bit(PG_dcache_dirty, &page->flags)) {
81
82 flush_kernel_dcache_page(page);
83 clear_bit(PG_dcache_dirty, &page->flags);
84 } else if (parisc_requires_coherency())
85 flush_kernel_dcache_page(page);
86 }
87
88 void
show_cache_info(struct seq_file * m)89 show_cache_info(struct seq_file *m)
90 {
91 char buf[32];
92
93 seq_printf(m, "I-cache\t\t: %ld KB\n",
94 cache_info.ic_size/1024 );
95 if (cache_info.dc_loop != 1)
96 snprintf(buf, 32, "%lu-way associative", cache_info.dc_loop);
97 seq_printf(m, "D-cache\t\t: %ld KB (%s%s, %s)\n",
98 cache_info.dc_size/1024,
99 (cache_info.dc_conf.cc_wt ? "WT":"WB"),
100 (cache_info.dc_conf.cc_sh ? ", shared I/D":""),
101 ((cache_info.dc_loop == 1) ? "direct mapped" : buf));
102 seq_printf(m, "ITLB entries\t: %ld\n" "DTLB entries\t: %ld%s\n",
103 cache_info.it_size,
104 cache_info.dt_size,
105 cache_info.dt_conf.tc_sh ? " - shared with ITLB":""
106 );
107
108 #ifndef CONFIG_PA20
109 /* BTLB - Block TLB */
110 if (btlb_info.max_size==0) {
111 seq_printf(m, "BTLB\t\t: not supported\n" );
112 } else {
113 seq_printf(m,
114 "BTLB fixed\t: max. %d pages, pagesize=%d (%dMB)\n"
115 "BTLB fix-entr.\t: %d instruction, %d data (%d combined)\n"
116 "BTLB var-entr.\t: %d instruction, %d data (%d combined)\n",
117 btlb_info.max_size, (int)4096,
118 btlb_info.max_size>>8,
119 btlb_info.fixed_range_info.num_i,
120 btlb_info.fixed_range_info.num_d,
121 btlb_info.fixed_range_info.num_comb,
122 btlb_info.variable_range_info.num_i,
123 btlb_info.variable_range_info.num_d,
124 btlb_info.variable_range_info.num_comb
125 );
126 }
127 #endif
128 }
129
130 void __init
parisc_cache_init(void)131 parisc_cache_init(void)
132 {
133 if (pdc_cache_info(&cache_info) < 0)
134 panic("parisc_cache_init: pdc_cache_info failed");
135
136 #if 0
137 printk("ic_size %lx dc_size %lx it_size %lx\n",
138 cache_info.ic_size,
139 cache_info.dc_size,
140 cache_info.it_size);
141
142 printk("DC base 0x%lx stride 0x%lx count 0x%lx loop 0x%lx\n",
143 cache_info.dc_base,
144 cache_info.dc_stride,
145 cache_info.dc_count,
146 cache_info.dc_loop);
147
148 printk("dc_conf = 0x%lx alias %d blk %d line %d shift %d\n",
149 *(unsigned long *) (&cache_info.dc_conf),
150 cache_info.dc_conf.cc_alias,
151 cache_info.dc_conf.cc_block,
152 cache_info.dc_conf.cc_line,
153 cache_info.dc_conf.cc_shift);
154 printk(" wt %d sh %d cst %d hv %d\n",
155 cache_info.dc_conf.cc_wt,
156 cache_info.dc_conf.cc_sh,
157 cache_info.dc_conf.cc_cst,
158 cache_info.dc_conf.cc_hv);
159
160 printk("IC base 0x%lx stride 0x%lx count 0x%lx loop 0x%lx\n",
161 cache_info.ic_base,
162 cache_info.ic_stride,
163 cache_info.ic_count,
164 cache_info.ic_loop);
165
166 printk("ic_conf = 0x%lx alias %d blk %d line %d shift %d\n",
167 *(unsigned long *) (&cache_info.ic_conf),
168 cache_info.ic_conf.cc_alias,
169 cache_info.ic_conf.cc_block,
170 cache_info.ic_conf.cc_line,
171 cache_info.ic_conf.cc_shift);
172 printk(" wt %d sh %d cst %d hv %d\n",
173 cache_info.ic_conf.cc_wt,
174 cache_info.ic_conf.cc_sh,
175 cache_info.ic_conf.cc_cst,
176 cache_info.ic_conf.cc_hv);
177
178 printk("D-TLB conf: sh %d page %d cst %d aid %d pad1 %d\n",
179 cache_info.dt_conf.tc_sh,
180 cache_info.dt_conf.tc_page,
181 cache_info.dt_conf.tc_cst,
182 cache_info.dt_conf.tc_aid,
183 cache_info.dt_conf.tc_pad1);
184
185 printk("I-TLB conf: sh %d page %d cst %d aid %d pad1 %d\n",
186 cache_info.it_conf.tc_sh,
187 cache_info.it_conf.tc_page,
188 cache_info.it_conf.tc_cst,
189 cache_info.it_conf.tc_aid,
190 cache_info.it_conf.tc_pad1);
191 #endif
192
193 split_tlb = 0;
194 if (cache_info.dt_conf.tc_sh == 0 || cache_info.dt_conf.tc_sh == 2) {
195 if (cache_info.dt_conf.tc_sh == 2)
196 printk(KERN_WARNING "Unexpected TLB configuration. "
197 "Will flush I/D separately (could be optimized).\n");
198
199 split_tlb = 1;
200 }
201
202 /* "New and Improved" version from Jim Hull
203 * (1 << (cc_block-1)) * (cc_line << (4 + cnf.cc_shift))
204 * The following CAFL_STRIDE is an optimized version, see
205 * http://lists.parisc-linux.org/pipermail/parisc-linux/2004-June/023625.html
206 * http://lists.parisc-linux.org/pipermail/parisc-linux/2004-June/023671.html
207 */
208 #define CAFL_STRIDE(cnf) (cnf.cc_line << (3 + cnf.cc_block + cnf.cc_shift))
209 dcache_stride = CAFL_STRIDE(cache_info.dc_conf);
210 icache_stride = CAFL_STRIDE(cache_info.ic_conf);
211 #undef CAFL_STRIDE
212
213 #ifndef CONFIG_PA20
214 if (pdc_btlb_info(&btlb_info) < 0) {
215 memset(&btlb_info, 0, sizeof btlb_info);
216 }
217 #endif
218
219 if ((boot_cpu_data.pdc.capabilities & PDC_MODEL_NVA_MASK) ==
220 PDC_MODEL_NVA_UNSUPPORTED) {
221 printk(KERN_WARNING "parisc_cache_init: Only equivalent aliasing supported!\n");
222 #if 0
223 panic("SMP kernel required to avoid non-equivalent aliasing");
224 #endif
225 }
226 }
227
disable_sr_hashing(void)228 void disable_sr_hashing(void)
229 {
230 int srhash_type, retval;
231 unsigned long space_bits;
232
233 switch (boot_cpu_data.cpu_type) {
234 case pcx: /* We shouldn't get this far. setup.c should prevent it. */
235 BUG();
236 return;
237
238 case pcxs:
239 case pcxt:
240 case pcxt_:
241 srhash_type = SRHASH_PCXST;
242 break;
243
244 case pcxl:
245 srhash_type = SRHASH_PCXL;
246 break;
247
248 case pcxl2: /* pcxl2 doesn't support space register hashing */
249 return;
250
251 default: /* Currently all PA2.0 machines use the same ins. sequence */
252 srhash_type = SRHASH_PA20;
253 break;
254 }
255
256 disable_sr_hashing_asm(srhash_type);
257
258 retval = pdc_spaceid_bits(&space_bits);
259 /* If this procedure isn't implemented, don't panic. */
260 if (retval < 0 && retval != PDC_BAD_OPTION)
261 panic("pdc_spaceid_bits call failed.\n");
262 if (space_bits != 0)
263 panic("SpaceID hashing is still on!\n");
264 }
265
266 static inline void
__flush_cache_page(struct vm_area_struct * vma,unsigned long vmaddr,unsigned long physaddr)267 __flush_cache_page(struct vm_area_struct *vma, unsigned long vmaddr,
268 unsigned long physaddr)
269 {
270 flush_dcache_page_asm(physaddr, vmaddr);
271 if (vma->vm_flags & VM_EXEC)
272 flush_icache_page_asm(physaddr, vmaddr);
273 }
274
flush_dcache_page(struct page * page)275 void flush_dcache_page(struct page *page)
276 {
277 struct address_space *mapping = page_mapping(page);
278 struct vm_area_struct *mpnt;
279 struct prio_tree_iter iter;
280 unsigned long offset;
281 unsigned long addr, old_addr = 0;
282 pgoff_t pgoff;
283
284 if (mapping && !mapping_mapped(mapping)) {
285 set_bit(PG_dcache_dirty, &page->flags);
286 return;
287 }
288
289 flush_kernel_dcache_page(page);
290
291 if (!mapping)
292 return;
293
294 pgoff = page->index << (PAGE_CACHE_SHIFT - PAGE_SHIFT);
295
296 /* We have carefully arranged in arch_get_unmapped_area() that
297 * *any* mappings of a file are always congruently mapped (whether
298 * declared as MAP_PRIVATE or MAP_SHARED), so we only need
299 * to flush one address here for them all to become coherent */
300
301 flush_dcache_mmap_lock(mapping);
302 vma_prio_tree_foreach(mpnt, &iter, &mapping->i_mmap, pgoff, pgoff) {
303 offset = (pgoff - mpnt->vm_pgoff) << PAGE_SHIFT;
304 addr = mpnt->vm_start + offset;
305
306 /* The TLB is the engine of coherence on parisc: The
307 * CPU is entitled to speculate any page with a TLB
308 * mapping, so here we kill the mapping then flush the
309 * page along a special flush only alias mapping.
310 * This guarantees that the page is no-longer in the
311 * cache for any process and nor may it be
312 * speculatively read in (until the user or kernel
313 * specifically accesses it, of course) */
314
315 flush_tlb_page(mpnt, addr);
316 if (old_addr == 0 || (old_addr & (SHMLBA - 1)) != (addr & (SHMLBA - 1))) {
317 __flush_cache_page(mpnt, addr, page_to_phys(page));
318 if (old_addr)
319 printk(KERN_ERR "INEQUIVALENT ALIASES 0x%lx and 0x%lx in file %s\n", old_addr, addr, mpnt->vm_file ? (char *)mpnt->vm_file->f_path.dentry->d_name.name : "(null)");
320 old_addr = addr;
321 }
322 }
323 flush_dcache_mmap_unlock(mapping);
324 }
325 EXPORT_SYMBOL(flush_dcache_page);
326
327 /* Defined in arch/parisc/kernel/pacache.S */
328 EXPORT_SYMBOL(flush_kernel_dcache_range_asm);
329 EXPORT_SYMBOL(flush_kernel_dcache_page_asm);
330 EXPORT_SYMBOL(flush_data_cache_local);
331 EXPORT_SYMBOL(flush_kernel_icache_range_asm);
332
clear_user_page_asm(void * page,unsigned long vaddr)333 void clear_user_page_asm(void *page, unsigned long vaddr)
334 {
335 unsigned long flags;
336 /* This function is implemented in assembly in pacache.S */
337 extern void __clear_user_page_asm(void *page, unsigned long vaddr);
338
339 purge_tlb_start(flags);
340 __clear_user_page_asm(page, vaddr);
341 purge_tlb_end(flags);
342 }
343
344 #define FLUSH_THRESHOLD 0x80000 /* 0.5MB */
345 int parisc_cache_flush_threshold __read_mostly = FLUSH_THRESHOLD;
346
parisc_setup_cache_timing(void)347 void __init parisc_setup_cache_timing(void)
348 {
349 unsigned long rangetime, alltime;
350 unsigned long size;
351
352 alltime = mfctl(16);
353 flush_data_cache();
354 alltime = mfctl(16) - alltime;
355
356 size = (unsigned long)(_end - _text);
357 rangetime = mfctl(16);
358 flush_kernel_dcache_range((unsigned long)_text, size);
359 rangetime = mfctl(16) - rangetime;
360
361 printk(KERN_DEBUG "Whole cache flush %lu cycles, flushing %lu bytes %lu cycles\n",
362 alltime, size, rangetime);
363
364 /* Racy, but if we see an intermediate value, it's ok too... */
365 parisc_cache_flush_threshold = size * alltime / rangetime;
366
367 parisc_cache_flush_threshold = (parisc_cache_flush_threshold + L1_CACHE_BYTES - 1) &~ (L1_CACHE_BYTES - 1);
368 if (!parisc_cache_flush_threshold)
369 parisc_cache_flush_threshold = FLUSH_THRESHOLD;
370
371 if (parisc_cache_flush_threshold > cache_info.dc_size)
372 parisc_cache_flush_threshold = cache_info.dc_size;
373
374 printk(KERN_INFO "Setting cache flush threshold to %x (%d CPUs online)\n", parisc_cache_flush_threshold, num_online_cpus());
375 }
376
377 extern void purge_kernel_dcache_page(unsigned long);
378 extern void clear_user_page_asm(void *page, unsigned long vaddr);
379
clear_user_page(void * page,unsigned long vaddr,struct page * pg)380 void clear_user_page(void *page, unsigned long vaddr, struct page *pg)
381 {
382 unsigned long flags;
383
384 purge_kernel_dcache_page((unsigned long)page);
385 purge_tlb_start(flags);
386 pdtlb_kernel(page);
387 purge_tlb_end(flags);
388 clear_user_page_asm(page, vaddr);
389 }
390 EXPORT_SYMBOL(clear_user_page);
391
flush_kernel_dcache_page_addr(void * addr)392 void flush_kernel_dcache_page_addr(void *addr)
393 {
394 unsigned long flags;
395
396 flush_kernel_dcache_page_asm(addr);
397 purge_tlb_start(flags);
398 pdtlb_kernel(addr);
399 purge_tlb_end(flags);
400 }
401 EXPORT_SYMBOL(flush_kernel_dcache_page_addr);
402
copy_user_page(void * vto,void * vfrom,unsigned long vaddr,struct page * pg)403 void copy_user_page(void *vto, void *vfrom, unsigned long vaddr,
404 struct page *pg)
405 {
406 /* no coherency needed (all in kmap/kunmap) */
407 copy_user_page_asm(vto, vfrom);
408 if (!parisc_requires_coherency())
409 flush_kernel_dcache_page_asm(vto);
410 }
411 EXPORT_SYMBOL(copy_user_page);
412
413 #ifdef CONFIG_PA8X00
414
kunmap_parisc(void * addr)415 void kunmap_parisc(void *addr)
416 {
417 if (parisc_requires_coherency())
418 flush_kernel_dcache_page_addr(addr);
419 }
420 EXPORT_SYMBOL(kunmap_parisc);
421 #endif
422
purge_tlb_entries(struct mm_struct * mm,unsigned long addr)423 void purge_tlb_entries(struct mm_struct *mm, unsigned long addr)
424 {
425 unsigned long flags;
426
427 /* Note: purge_tlb_entries can be called at startup with
428 no context. */
429
430 /* Disable preemption while we play with %sr1. */
431 preempt_disable();
432 mtsp(mm->context, 1);
433 purge_tlb_start(flags);
434 pdtlb(addr);
435 pitlb(addr);
436 purge_tlb_end(flags);
437 preempt_enable();
438 }
439 EXPORT_SYMBOL(purge_tlb_entries);
440
__flush_tlb_range(unsigned long sid,unsigned long start,unsigned long end)441 void __flush_tlb_range(unsigned long sid, unsigned long start,
442 unsigned long end)
443 {
444 unsigned long npages;
445
446 npages = ((end - (start & PAGE_MASK)) + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
447 if (npages >= 512) /* 2MB of space: arbitrary, should be tuned */
448 flush_tlb_all();
449 else {
450 unsigned long flags;
451
452 mtsp(sid, 1);
453 purge_tlb_start(flags);
454 if (split_tlb) {
455 while (npages--) {
456 pdtlb(start);
457 pitlb(start);
458 start += PAGE_SIZE;
459 }
460 } else {
461 while (npages--) {
462 pdtlb(start);
463 start += PAGE_SIZE;
464 }
465 }
466 purge_tlb_end(flags);
467 }
468 }
469
cacheflush_h_tmp_function(void * dummy)470 static void cacheflush_h_tmp_function(void *dummy)
471 {
472 flush_cache_all_local();
473 }
474
flush_cache_all(void)475 void flush_cache_all(void)
476 {
477 on_each_cpu(cacheflush_h_tmp_function, NULL, 1);
478 }
479
flush_cache_mm(struct mm_struct * mm)480 void flush_cache_mm(struct mm_struct *mm)
481 {
482 #ifdef CONFIG_SMP
483 flush_cache_all();
484 #else
485 flush_cache_all_local();
486 #endif
487 }
488
489 void
flush_user_dcache_range(unsigned long start,unsigned long end)490 flush_user_dcache_range(unsigned long start, unsigned long end)
491 {
492 if ((end - start) < parisc_cache_flush_threshold)
493 flush_user_dcache_range_asm(start,end);
494 else
495 flush_data_cache();
496 }
497
498 void
flush_user_icache_range(unsigned long start,unsigned long end)499 flush_user_icache_range(unsigned long start, unsigned long end)
500 {
501 if ((end - start) < parisc_cache_flush_threshold)
502 flush_user_icache_range_asm(start,end);
503 else
504 flush_instruction_cache();
505 }
506
507
flush_cache_range(struct vm_area_struct * vma,unsigned long start,unsigned long end)508 void flush_cache_range(struct vm_area_struct *vma,
509 unsigned long start, unsigned long end)
510 {
511 int sr3;
512
513 BUG_ON(!vma->vm_mm->context);
514
515 sr3 = mfsp(3);
516 if (vma->vm_mm->context == sr3) {
517 flush_user_dcache_range(start,end);
518 flush_user_icache_range(start,end);
519 } else {
520 flush_cache_all();
521 }
522 }
523
524 void
flush_cache_page(struct vm_area_struct * vma,unsigned long vmaddr,unsigned long pfn)525 flush_cache_page(struct vm_area_struct *vma, unsigned long vmaddr, unsigned long pfn)
526 {
527 BUG_ON(!vma->vm_mm->context);
528
529 flush_tlb_page(vma, vmaddr);
530 __flush_cache_page(vma, vmaddr, page_to_phys(pfn_to_page(pfn)));
531
532 }
533