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
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)
10 * Cache and TLB management
14 #include <linux/init.h>
15 #include <linux/kernel.h>
17 #include <linux/module.h>
18 #include <linux/seq_file.h>
19 #include <linux/pagemap.h>
20 #include <linux/sched.h>
21 #include <linux/sched/mm.h>
23 #include <asm/cache.h>
24 #include <asm/cacheflush.h>
25 #include <asm/tlbflush.h>
27 #include <asm/pgalloc.h>
28 #include <asm/processor.h>
29 #include <asm/sections.h>
30 #include <asm/shmparam.h>
32 int split_tlb __read_mostly;
33 int dcache_stride __read_mostly;
34 int icache_stride __read_mostly;
35 EXPORT_SYMBOL(dcache_stride);
37 void flush_dcache_page_asm(unsigned long phys_addr, unsigned long vaddr);
38 EXPORT_SYMBOL(flush_dcache_page_asm);
39 void flush_icache_page_asm(unsigned long phys_addr, unsigned long vaddr);
42 /* On some machines (e.g. ones with the Merced bus), there can be
43 * only a single PxTLB broadcast at a time; this must be guaranteed
44 * by software. We put a spinlock around all TLB flushes to
47 DEFINE_SPINLOCK(pa_tlb_lock);
49 struct pdc_cache_info cache_info __read_mostly;
51 static struct pdc_btlb_info btlb_info __read_mostly;
56 flush_data_cache(void)
58 on_each_cpu(flush_data_cache_local, NULL, 1);
61 flush_instruction_cache(void)
63 on_each_cpu(flush_instruction_cache_local, NULL, 1);
68 flush_cache_all_local(void)
70 flush_instruction_cache_local(NULL);
71 flush_data_cache_local(NULL);
73 EXPORT_SYMBOL(flush_cache_all_local);
75 /* Virtual address of pfn. */
76 #define pfn_va(pfn) __va(PFN_PHYS(pfn))
79 update_mmu_cache(struct vm_area_struct *vma, unsigned long address, pte_t *ptep)
81 unsigned long pfn = pte_pfn(*ptep);
84 /* We don't have pte special. As a result, we can be called with
85 an invalid pfn and we don't need to flush the kernel dcache page.
86 This occurs with FireGL card in C8000. */
90 page = pfn_to_page(pfn);
91 if (page_mapping_file(page) &&
92 test_bit(PG_dcache_dirty, &page->flags)) {
93 flush_kernel_dcache_page_addr(pfn_va(pfn));
94 clear_bit(PG_dcache_dirty, &page->flags);
95 } else if (parisc_requires_coherency())
96 flush_kernel_dcache_page_addr(pfn_va(pfn));
100 show_cache_info(struct seq_file *m)
104 seq_printf(m, "I-cache\t\t: %ld KB\n",
105 cache_info.ic_size/1024 );
106 if (cache_info.dc_loop != 1)
107 snprintf(buf, 32, "%lu-way associative", cache_info.dc_loop);
108 seq_printf(m, "D-cache\t\t: %ld KB (%s%s, %s)\n",
109 cache_info.dc_size/1024,
110 (cache_info.dc_conf.cc_wt ? "WT":"WB"),
111 (cache_info.dc_conf.cc_sh ? ", shared I/D":""),
112 ((cache_info.dc_loop == 1) ? "direct mapped" : buf));
113 seq_printf(m, "ITLB entries\t: %ld\n" "DTLB entries\t: %ld%s\n",
116 cache_info.dt_conf.tc_sh ? " - shared with ITLB":""
120 /* BTLB - Block TLB */
121 if (btlb_info.max_size==0) {
122 seq_printf(m, "BTLB\t\t: not supported\n" );
125 "BTLB fixed\t: max. %d pages, pagesize=%d (%dMB)\n"
126 "BTLB fix-entr.\t: %d instruction, %d data (%d combined)\n"
127 "BTLB var-entr.\t: %d instruction, %d data (%d combined)\n",
128 btlb_info.max_size, (int)4096,
129 btlb_info.max_size>>8,
130 btlb_info.fixed_range_info.num_i,
131 btlb_info.fixed_range_info.num_d,
132 btlb_info.fixed_range_info.num_comb,
133 btlb_info.variable_range_info.num_i,
134 btlb_info.variable_range_info.num_d,
135 btlb_info.variable_range_info.num_comb
142 parisc_cache_init(void)
144 if (pdc_cache_info(&cache_info) < 0)
145 panic("parisc_cache_init: pdc_cache_info failed");
148 printk("ic_size %lx dc_size %lx it_size %lx\n",
153 printk("DC base 0x%lx stride 0x%lx count 0x%lx loop 0x%lx\n",
155 cache_info.dc_stride,
159 printk("dc_conf = 0x%lx alias %d blk %d line %d shift %d\n",
160 *(unsigned long *) (&cache_info.dc_conf),
161 cache_info.dc_conf.cc_alias,
162 cache_info.dc_conf.cc_block,
163 cache_info.dc_conf.cc_line,
164 cache_info.dc_conf.cc_shift);
165 printk(" wt %d sh %d cst %d hv %d\n",
166 cache_info.dc_conf.cc_wt,
167 cache_info.dc_conf.cc_sh,
168 cache_info.dc_conf.cc_cst,
169 cache_info.dc_conf.cc_hv);
171 printk("IC base 0x%lx stride 0x%lx count 0x%lx loop 0x%lx\n",
173 cache_info.ic_stride,
177 printk("IT base 0x%lx stride 0x%lx count 0x%lx loop 0x%lx off_base 0x%lx off_stride 0x%lx off_count 0x%lx\n",
178 cache_info.it_sp_base,
179 cache_info.it_sp_stride,
180 cache_info.it_sp_count,
182 cache_info.it_off_base,
183 cache_info.it_off_stride,
184 cache_info.it_off_count);
186 printk("DT base 0x%lx stride 0x%lx count 0x%lx loop 0x%lx off_base 0x%lx off_stride 0x%lx off_count 0x%lx\n",
187 cache_info.dt_sp_base,
188 cache_info.dt_sp_stride,
189 cache_info.dt_sp_count,
191 cache_info.dt_off_base,
192 cache_info.dt_off_stride,
193 cache_info.dt_off_count);
195 printk("ic_conf = 0x%lx alias %d blk %d line %d shift %d\n",
196 *(unsigned long *) (&cache_info.ic_conf),
197 cache_info.ic_conf.cc_alias,
198 cache_info.ic_conf.cc_block,
199 cache_info.ic_conf.cc_line,
200 cache_info.ic_conf.cc_shift);
201 printk(" wt %d sh %d cst %d hv %d\n",
202 cache_info.ic_conf.cc_wt,
203 cache_info.ic_conf.cc_sh,
204 cache_info.ic_conf.cc_cst,
205 cache_info.ic_conf.cc_hv);
207 printk("D-TLB conf: sh %d page %d cst %d aid %d sr %d\n",
208 cache_info.dt_conf.tc_sh,
209 cache_info.dt_conf.tc_page,
210 cache_info.dt_conf.tc_cst,
211 cache_info.dt_conf.tc_aid,
212 cache_info.dt_conf.tc_sr);
214 printk("I-TLB conf: sh %d page %d cst %d aid %d sr %d\n",
215 cache_info.it_conf.tc_sh,
216 cache_info.it_conf.tc_page,
217 cache_info.it_conf.tc_cst,
218 cache_info.it_conf.tc_aid,
219 cache_info.it_conf.tc_sr);
223 if (cache_info.dt_conf.tc_sh == 0 || cache_info.dt_conf.tc_sh == 2) {
224 if (cache_info.dt_conf.tc_sh == 2)
225 printk(KERN_WARNING "Unexpected TLB configuration. "
226 "Will flush I/D separately (could be optimized).\n");
231 /* "New and Improved" version from Jim Hull
232 * (1 << (cc_block-1)) * (cc_line << (4 + cnf.cc_shift))
233 * The following CAFL_STRIDE is an optimized version, see
234 * http://lists.parisc-linux.org/pipermail/parisc-linux/2004-June/023625.html
235 * http://lists.parisc-linux.org/pipermail/parisc-linux/2004-June/023671.html
237 #define CAFL_STRIDE(cnf) (cnf.cc_line << (3 + cnf.cc_block + cnf.cc_shift))
238 dcache_stride = CAFL_STRIDE(cache_info.dc_conf);
239 icache_stride = CAFL_STRIDE(cache_info.ic_conf);
243 if (pdc_btlb_info(&btlb_info) < 0) {
244 memset(&btlb_info, 0, sizeof btlb_info);
248 if ((boot_cpu_data.pdc.capabilities & PDC_MODEL_NVA_MASK) ==
249 PDC_MODEL_NVA_UNSUPPORTED) {
250 printk(KERN_WARNING "parisc_cache_init: Only equivalent aliasing supported!\n");
252 panic("SMP kernel required to avoid non-equivalent aliasing");
257 void disable_sr_hashing(void)
259 int srhash_type, retval;
260 unsigned long space_bits;
262 switch (boot_cpu_data.cpu_type) {
263 case pcx: /* We shouldn't get this far. setup.c should prevent it. */
270 srhash_type = SRHASH_PCXST;
274 srhash_type = SRHASH_PCXL;
277 case pcxl2: /* pcxl2 doesn't support space register hashing */
280 default: /* Currently all PA2.0 machines use the same ins. sequence */
281 srhash_type = SRHASH_PA20;
285 disable_sr_hashing_asm(srhash_type);
287 retval = pdc_spaceid_bits(&space_bits);
288 /* If this procedure isn't implemented, don't panic. */
289 if (retval < 0 && retval != PDC_BAD_OPTION)
290 panic("pdc_spaceid_bits call failed.\n");
292 panic("SpaceID hashing is still on!\n");
296 __flush_cache_page(struct vm_area_struct *vma, unsigned long vmaddr,
297 unsigned long physaddr)
300 flush_dcache_page_asm(physaddr, vmaddr);
301 if (vma->vm_flags & VM_EXEC)
302 flush_icache_page_asm(physaddr, vmaddr);
306 void flush_dcache_page(struct page *page)
308 struct address_space *mapping = page_mapping_file(page);
309 struct vm_area_struct *mpnt;
310 unsigned long offset;
311 unsigned long addr, old_addr = 0;
314 if (mapping && !mapping_mapped(mapping)) {
315 set_bit(PG_dcache_dirty, &page->flags);
319 flush_kernel_dcache_page(page);
326 /* We have carefully arranged in arch_get_unmapped_area() that
327 * *any* mappings of a file are always congruently mapped (whether
328 * declared as MAP_PRIVATE or MAP_SHARED), so we only need
329 * to flush one address here for them all to become coherent */
331 flush_dcache_mmap_lock(mapping);
332 vma_interval_tree_foreach(mpnt, &mapping->i_mmap, pgoff, pgoff) {
333 offset = (pgoff - mpnt->vm_pgoff) << PAGE_SHIFT;
334 addr = mpnt->vm_start + offset;
336 /* The TLB is the engine of coherence on parisc: The
337 * CPU is entitled to speculate any page with a TLB
338 * mapping, so here we kill the mapping then flush the
339 * page along a special flush only alias mapping.
340 * This guarantees that the page is no-longer in the
341 * cache for any process and nor may it be
342 * speculatively read in (until the user or kernel
343 * specifically accesses it, of course) */
345 flush_tlb_page(mpnt, addr);
346 if (old_addr == 0 || (old_addr & (SHM_COLOUR - 1))
347 != (addr & (SHM_COLOUR - 1))) {
348 __flush_cache_page(mpnt, addr, page_to_phys(page));
350 printk(KERN_ERR "INEQUIVALENT ALIASES 0x%lx and 0x%lx in file %pD\n", old_addr, addr, mpnt->vm_file);
354 flush_dcache_mmap_unlock(mapping);
356 EXPORT_SYMBOL(flush_dcache_page);
358 /* Defined in arch/parisc/kernel/pacache.S */
359 EXPORT_SYMBOL(flush_kernel_dcache_range_asm);
360 EXPORT_SYMBOL(flush_kernel_dcache_page_asm);
361 EXPORT_SYMBOL(flush_data_cache_local);
362 EXPORT_SYMBOL(flush_kernel_icache_range_asm);
364 #define FLUSH_THRESHOLD 0x80000 /* 0.5MB */
365 static unsigned long parisc_cache_flush_threshold __read_mostly = FLUSH_THRESHOLD;
367 #define FLUSH_TLB_THRESHOLD (2*1024*1024) /* 2MB initial TLB threshold */
368 static unsigned long parisc_tlb_flush_threshold __read_mostly = FLUSH_TLB_THRESHOLD;
370 void __init parisc_setup_cache_timing(void)
372 unsigned long rangetime, alltime;
373 unsigned long size, start;
374 unsigned long threshold;
378 alltime = mfctl(16) - alltime;
380 size = (unsigned long)(_end - _text);
381 rangetime = mfctl(16);
382 flush_kernel_dcache_range((unsigned long)_text, size);
383 rangetime = mfctl(16) - rangetime;
385 printk(KERN_DEBUG "Whole cache flush %lu cycles, flushing %lu bytes %lu cycles\n",
386 alltime, size, rangetime);
388 threshold = L1_CACHE_ALIGN(size * alltime / rangetime);
389 if (threshold > cache_info.dc_size)
390 threshold = cache_info.dc_size;
392 parisc_cache_flush_threshold = threshold;
393 printk(KERN_INFO "Cache flush threshold set to %lu KiB\n",
394 parisc_cache_flush_threshold/1024);
396 /* calculate TLB flush threshold */
398 /* On SMP machines, skip the TLB measure of kernel text which
399 * has been mapped as huge pages. */
400 if (num_online_cpus() > 1 && !parisc_requires_coherency()) {
401 threshold = max(cache_info.it_size, cache_info.dt_size);
402 threshold *= PAGE_SIZE;
403 threshold /= num_online_cpus();
404 goto set_tlb_threshold;
409 alltime = mfctl(16) - alltime;
412 start = (unsigned long) _text;
413 rangetime = mfctl(16);
414 while (start < (unsigned long) _end) {
415 flush_tlb_kernel_range(start, start + PAGE_SIZE);
419 rangetime = mfctl(16) - rangetime;
421 printk(KERN_DEBUG "Whole TLB flush %lu cycles, flushing %lu bytes %lu cycles\n",
422 alltime, size, rangetime);
424 threshold = PAGE_ALIGN(num_online_cpus() * size * alltime / rangetime);
428 parisc_tlb_flush_threshold = threshold;
429 printk(KERN_INFO "TLB flush threshold set to %lu KiB\n",
430 parisc_tlb_flush_threshold/1024);
433 extern void purge_kernel_dcache_page_asm(unsigned long);
434 extern void clear_user_page_asm(void *, unsigned long);
435 extern void copy_user_page_asm(void *, void *, unsigned long);
437 void flush_kernel_dcache_page_addr(void *addr)
441 flush_kernel_dcache_page_asm(addr);
442 purge_tlb_start(flags);
444 purge_tlb_end(flags);
446 EXPORT_SYMBOL(flush_kernel_dcache_page_addr);
448 void copy_user_page(void *vto, void *vfrom, unsigned long vaddr,
451 /* Copy using kernel mapping. No coherency is needed (all in
452 kunmap) for the `to' page. However, the `from' page needs to
453 be flushed through a mapping equivalent to the user mapping
454 before it can be accessed through the kernel mapping. */
456 flush_dcache_page_asm(__pa(vfrom), vaddr);
457 copy_page_asm(vto, vfrom);
460 EXPORT_SYMBOL(copy_user_page);
462 /* __flush_tlb_range()
464 * returns 1 if all TLBs were flushed.
466 int __flush_tlb_range(unsigned long sid, unsigned long start,
471 if ((!IS_ENABLED(CONFIG_SMP) || !arch_irqs_disabled()) &&
472 end - start >= parisc_tlb_flush_threshold) {
477 /* Purge TLB entries for small ranges using the pdtlb and
478 pitlb instructions. These instructions execute locally
479 but cause a purge request to be broadcast to other TLBs. */
480 if (likely(!split_tlb)) {
481 while (start < end) {
482 purge_tlb_start(flags);
485 purge_tlb_end(flags);
492 while (start < end) {
493 purge_tlb_start(flags);
497 purge_tlb_end(flags);
503 static void cacheflush_h_tmp_function(void *dummy)
505 flush_cache_all_local();
508 void flush_cache_all(void)
510 on_each_cpu(cacheflush_h_tmp_function, NULL, 1);
513 static inline unsigned long mm_total_size(struct mm_struct *mm)
515 struct vm_area_struct *vma;
516 unsigned long usize = 0;
518 for (vma = mm->mmap; vma; vma = vma->vm_next)
519 usize += vma->vm_end - vma->vm_start;
523 static inline pte_t *get_ptep(pgd_t *pgd, unsigned long addr)
527 if (!pgd_none(*pgd)) {
528 pud_t *pud = pud_offset(pgd, addr);
529 if (!pud_none(*pud)) {
530 pmd_t *pmd = pmd_offset(pud, addr);
532 ptep = pte_offset_map(pmd, addr);
538 void flush_cache_mm(struct mm_struct *mm)
540 struct vm_area_struct *vma;
543 /* Flushing the whole cache on each cpu takes forever on
544 rp3440, etc. So, avoid it if the mm isn't too big. */
545 if ((!IS_ENABLED(CONFIG_SMP) || !arch_irqs_disabled()) &&
546 mm_total_size(mm) >= parisc_cache_flush_threshold) {
553 if (mm->context == mfsp(3)) {
554 for (vma = mm->mmap; vma; vma = vma->vm_next) {
555 flush_user_dcache_range_asm(vma->vm_start, vma->vm_end);
556 if (vma->vm_flags & VM_EXEC)
557 flush_user_icache_range_asm(vma->vm_start, vma->vm_end);
558 flush_tlb_range(vma, vma->vm_start, vma->vm_end);
564 for (vma = mm->mmap; vma; vma = vma->vm_next) {
567 for (addr = vma->vm_start; addr < vma->vm_end;
570 pte_t *ptep = get_ptep(pgd, addr);
573 pfn = pte_pfn(*ptep);
576 if (unlikely(mm->context))
577 flush_tlb_page(vma, addr);
578 __flush_cache_page(vma, addr, PFN_PHYS(pfn));
583 void flush_cache_range(struct vm_area_struct *vma,
584 unsigned long start, unsigned long end)
589 if ((!IS_ENABLED(CONFIG_SMP) || !arch_irqs_disabled()) &&
590 end - start >= parisc_cache_flush_threshold) {
591 if (vma->vm_mm->context)
592 flush_tlb_range(vma, start, end);
597 if (vma->vm_mm->context == mfsp(3)) {
598 flush_user_dcache_range_asm(start, end);
599 if (vma->vm_flags & VM_EXEC)
600 flush_user_icache_range_asm(start, end);
601 flush_tlb_range(vma, start, end);
605 pgd = vma->vm_mm->pgd;
606 for (addr = vma->vm_start; addr < vma->vm_end; addr += PAGE_SIZE) {
608 pte_t *ptep = get_ptep(pgd, addr);
611 pfn = pte_pfn(*ptep);
612 if (pfn_valid(pfn)) {
613 if (unlikely(vma->vm_mm->context))
614 flush_tlb_page(vma, addr);
615 __flush_cache_page(vma, addr, PFN_PHYS(pfn));
621 flush_cache_page(struct vm_area_struct *vma, unsigned long vmaddr, unsigned long pfn)
623 if (pfn_valid(pfn)) {
624 if (likely(vma->vm_mm->context))
625 flush_tlb_page(vma, vmaddr);
626 __flush_cache_page(vma, vmaddr, PFN_PHYS(pfn));
630 void flush_kernel_vmap_range(void *vaddr, int size)
632 unsigned long start = (unsigned long)vaddr;
633 unsigned long end = start + size;
635 if ((!IS_ENABLED(CONFIG_SMP) || !arch_irqs_disabled()) &&
636 (unsigned long)size >= parisc_cache_flush_threshold) {
637 flush_tlb_kernel_range(start, end);
642 flush_kernel_dcache_range_asm(start, end);
643 flush_tlb_kernel_range(start, end);
645 EXPORT_SYMBOL(flush_kernel_vmap_range);
647 void invalidate_kernel_vmap_range(void *vaddr, int size)
649 unsigned long start = (unsigned long)vaddr;
650 unsigned long end = start + size;
652 if ((!IS_ENABLED(CONFIG_SMP) || !arch_irqs_disabled()) &&
653 (unsigned long)size >= parisc_cache_flush_threshold) {
654 flush_tlb_kernel_range(start, end);
659 purge_kernel_dcache_range_asm(start, end);
660 flush_tlb_kernel_range(start, end);
662 EXPORT_SYMBOL(invalidate_kernel_vmap_range);