/* * This file is subject to the terms and conditions of the GNU General Public * License. See the file "COPYING" in the main directory of this archive * for more details. * * Copyright (C) 1999-2006 Helge Deller (07-13-1999) * Copyright (C) 1999 SuSE GmbH Nuernberg * Copyright (C) 2000 Philipp Rumpf (prumpf@tux.org) * * Cache and TLB management * */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include int split_tlb __read_mostly; int dcache_stride __read_mostly; int icache_stride __read_mostly; EXPORT_SYMBOL(dcache_stride); void flush_dcache_page_asm(unsigned long phys_addr, unsigned long vaddr); EXPORT_SYMBOL(flush_dcache_page_asm); void flush_icache_page_asm(unsigned long phys_addr, unsigned long vaddr); /* On some machines (e.g. ones with the Merced bus), there can be * only a single PxTLB broadcast at a time; this must be guaranteed * by software. We put a spinlock around all TLB flushes to * ensure this. */ DEFINE_SPINLOCK(pa_tlb_lock); struct pdc_cache_info cache_info __read_mostly; #ifndef CONFIG_PA20 static struct pdc_btlb_info btlb_info __read_mostly; #endif #ifdef CONFIG_SMP void flush_data_cache(void) { on_each_cpu(flush_data_cache_local, NULL, 1); } void flush_instruction_cache(void) { on_each_cpu(flush_instruction_cache_local, NULL, 1); } #endif void flush_cache_all_local(void) { flush_instruction_cache_local(NULL); flush_data_cache_local(NULL); } EXPORT_SYMBOL(flush_cache_all_local); void update_mmu_cache(struct vm_area_struct *vma, unsigned long address, pte_t *ptep) { struct page *page = pte_page(*ptep); if (pfn_valid(page_to_pfn(page)) && page_mapping(page) && test_bit(PG_dcache_dirty, &page->flags)) { flush_kernel_dcache_page(page); clear_bit(PG_dcache_dirty, &page->flags); } else if (parisc_requires_coherency()) flush_kernel_dcache_page(page); } void show_cache_info(struct seq_file *m) { char buf[32]; seq_printf(m, "I-cache\t\t: %ld KB\n", cache_info.ic_size/1024 ); if (cache_info.dc_loop != 1) snprintf(buf, 32, "%lu-way associative", cache_info.dc_loop); seq_printf(m, "D-cache\t\t: %ld KB (%s%s, %s)\n", cache_info.dc_size/1024, (cache_info.dc_conf.cc_wt ? "WT":"WB"), (cache_info.dc_conf.cc_sh ? ", shared I/D":""), ((cache_info.dc_loop == 1) ? "direct mapped" : buf)); seq_printf(m, "ITLB entries\t: %ld\n" "DTLB entries\t: %ld%s\n", cache_info.it_size, cache_info.dt_size, cache_info.dt_conf.tc_sh ? " - shared with ITLB":"" ); #ifndef CONFIG_PA20 /* BTLB - Block TLB */ if (btlb_info.max_size==0) { seq_printf(m, "BTLB\t\t: not supported\n" ); } else { seq_printf(m, "BTLB fixed\t: max. %d pages, pagesize=%d (%dMB)\n" "BTLB fix-entr.\t: %d instruction, %d data (%d combined)\n" "BTLB var-entr.\t: %d instruction, %d data (%d combined)\n", btlb_info.max_size, (int)4096, btlb_info.max_size>>8, btlb_info.fixed_range_info.num_i, btlb_info.fixed_range_info.num_d, btlb_info.fixed_range_info.num_comb, btlb_info.variable_range_info.num_i, btlb_info.variable_range_info.num_d, btlb_info.variable_range_info.num_comb ); } #endif } void __init parisc_cache_init(void) { if (pdc_cache_info(&cache_info) < 0) panic("parisc_cache_init: pdc_cache_info failed"); #if 0 printk("ic_size %lx dc_size %lx it_size %lx\n", cache_info.ic_size, cache_info.dc_size, cache_info.it_size); printk("DC base 0x%lx stride 0x%lx count 0x%lx loop 0x%lx\n", cache_info.dc_base, cache_info.dc_stride, cache_info.dc_count, cache_info.dc_loop); printk("dc_conf = 0x%lx alias %d blk %d line %d shift %d\n", *(unsigned long *) (&cache_info.dc_conf), cache_info.dc_conf.cc_alias, cache_info.dc_conf.cc_block, cache_info.dc_conf.cc_line, cache_info.dc_conf.cc_shift); printk(" wt %d sh %d cst %d hv %d\n", cache_info.dc_conf.cc_wt, cache_info.dc_conf.cc_sh, cache_info.dc_conf.cc_cst, cache_info.dc_conf.cc_hv); printk("IC base 0x%lx stride 0x%lx count 0x%lx loop 0x%lx\n", cache_info.ic_base, cache_info.ic_stride, cache_info.ic_count, cache_info.ic_loop); printk("ic_conf = 0x%lx alias %d blk %d line %d shift %d\n", *(unsigned long *) (&cache_info.ic_conf), cache_info.ic_conf.cc_alias, cache_info.ic_conf.cc_block, cache_info.ic_conf.cc_line, cache_info.ic_conf.cc_shift); printk(" wt %d sh %d cst %d hv %d\n", cache_info.ic_conf.cc_wt, cache_info.ic_conf.cc_sh, cache_info.ic_conf.cc_cst, cache_info.ic_conf.cc_hv); printk("D-TLB conf: sh %d page %d cst %d aid %d pad1 %d\n", cache_info.dt_conf.tc_sh, cache_info.dt_conf.tc_page, cache_info.dt_conf.tc_cst, cache_info.dt_conf.tc_aid, cache_info.dt_conf.tc_pad1); printk("I-TLB conf: sh %d page %d cst %d aid %d pad1 %d\n", cache_info.it_conf.tc_sh, cache_info.it_conf.tc_page, cache_info.it_conf.tc_cst, cache_info.it_conf.tc_aid, cache_info.it_conf.tc_pad1); #endif split_tlb = 0; if (cache_info.dt_conf.tc_sh == 0 || cache_info.dt_conf.tc_sh == 2) { if (cache_info.dt_conf.tc_sh == 2) printk(KERN_WARNING "Unexpected TLB configuration. " "Will flush I/D separately (could be optimized).\n"); split_tlb = 1; } /* "New and Improved" version from Jim Hull * (1 << (cc_block-1)) * (cc_line << (4 + cnf.cc_shift)) * The following CAFL_STRIDE is an optimized version, see * http://lists.parisc-linux.org/pipermail/parisc-linux/2004-June/023625.html * http://lists.parisc-linux.org/pipermail/parisc-linux/2004-June/023671.html */ #define CAFL_STRIDE(cnf) (cnf.cc_line << (3 + cnf.cc_block + cnf.cc_shift)) dcache_stride = CAFL_STRIDE(cache_info.dc_conf); icache_stride = CAFL_STRIDE(cache_info.ic_conf); #undef CAFL_STRIDE #ifndef CONFIG_PA20 if (pdc_btlb_info(&btlb_info) < 0) { memset(&btlb_info, 0, sizeof btlb_info); } #endif if ((boot_cpu_data.pdc.capabilities & PDC_MODEL_NVA_MASK) == PDC_MODEL_NVA_UNSUPPORTED) { printk(KERN_WARNING "parisc_cache_init: Only equivalent aliasing supported!\n"); #if 0 panic("SMP kernel required to avoid non-equivalent aliasing"); #endif } } void disable_sr_hashing(void) { int srhash_type, retval; unsigned long space_bits; switch (boot_cpu_data.cpu_type) { case pcx: /* We shouldn't get this far. setup.c should prevent it. */ BUG(); return; case pcxs: case pcxt: case pcxt_: srhash_type = SRHASH_PCXST; break; case pcxl: srhash_type = SRHASH_PCXL; break; case pcxl2: /* pcxl2 doesn't support space register hashing */ return; default: /* Currently all PA2.0 machines use the same ins. sequence */ srhash_type = SRHASH_PA20; break; } disable_sr_hashing_asm(srhash_type); retval = pdc_spaceid_bits(&space_bits); /* If this procedure isn't implemented, don't panic. */ if (retval < 0 && retval != PDC_BAD_OPTION) panic("pdc_spaceid_bits call failed.\n"); if (space_bits != 0) panic("SpaceID hashing is still on!\n"); } static inline void __flush_cache_page(struct vm_area_struct *vma, unsigned long vmaddr, unsigned long physaddr) { flush_dcache_page_asm(physaddr, vmaddr); if (vma->vm_flags & VM_EXEC) flush_icache_page_asm(physaddr, vmaddr); } void flush_dcache_page(struct page *page) { struct address_space *mapping = page_mapping(page); struct vm_area_struct *mpnt; unsigned long offset; unsigned long addr, old_addr = 0; pgoff_t pgoff; if (mapping && !mapping_mapped(mapping)) { set_bit(PG_dcache_dirty, &page->flags); return; } flush_kernel_dcache_page(page); if (!mapping) return; pgoff = page->index << (PAGE_CACHE_SHIFT - PAGE_SHIFT); /* We have carefully arranged in arch_get_unmapped_area() that * *any* mappings of a file are always congruently mapped (whether * declared as MAP_PRIVATE or MAP_SHARED), so we only need * to flush one address here for them all to become coherent */ flush_dcache_mmap_lock(mapping); vma_interval_tree_foreach(mpnt, &mapping->i_mmap, pgoff, pgoff) { offset = (pgoff - mpnt->vm_pgoff) << PAGE_SHIFT; addr = mpnt->vm_start + offset; /* The TLB is the engine of coherence on parisc: The * CPU is entitled to speculate any page with a TLB * mapping, so here we kill the mapping then flush the * page along a special flush only alias mapping. * This guarantees that the page is no-longer in the * cache for any process and nor may it be * speculatively read in (until the user or kernel * specifically accesses it, of course) */ flush_tlb_page(mpnt, addr); if (old_addr == 0 || (old_addr & (SHMLBA - 1)) != (addr & (SHMLBA - 1))) { __flush_cache_page(mpnt, addr, page_to_phys(page)); if (old_addr) 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)"); old_addr = addr; } } flush_dcache_mmap_unlock(mapping); } EXPORT_SYMBOL(flush_dcache_page); /* Defined in arch/parisc/kernel/pacache.S */ EXPORT_SYMBOL(flush_kernel_dcache_range_asm); EXPORT_SYMBOL(flush_kernel_dcache_page_asm); EXPORT_SYMBOL(flush_data_cache_local); EXPORT_SYMBOL(flush_kernel_icache_range_asm); #define FLUSH_THRESHOLD 0x80000 /* 0.5MB */ int parisc_cache_flush_threshold __read_mostly = FLUSH_THRESHOLD; void __init parisc_setup_cache_timing(void) { unsigned long rangetime, alltime; unsigned long size; alltime = mfctl(16); flush_data_cache(); alltime = mfctl(16) - alltime; size = (unsigned long)(_end - _text); rangetime = mfctl(16); flush_kernel_dcache_range((unsigned long)_text, size); rangetime = mfctl(16) - rangetime; printk(KERN_DEBUG "Whole cache flush %lu cycles, flushing %lu bytes %lu cycles\n", alltime, size, rangetime); /* Racy, but if we see an intermediate value, it's ok too... */ parisc_cache_flush_threshold = size * alltime / rangetime; parisc_cache_flush_threshold = (parisc_cache_flush_threshold + L1_CACHE_BYTES - 1) &~ (L1_CACHE_BYTES - 1); if (!parisc_cache_flush_threshold) parisc_cache_flush_threshold = FLUSH_THRESHOLD; if (parisc_cache_flush_threshold > cache_info.dc_size) parisc_cache_flush_threshold = cache_info.dc_size; printk(KERN_INFO "Setting cache flush threshold to %x (%d CPUs online)\n", parisc_cache_flush_threshold, num_online_cpus()); } extern void purge_kernel_dcache_page_asm(unsigned long); extern void clear_user_page_asm(void *, unsigned long); extern void copy_user_page_asm(void *, void *, unsigned long); void flush_kernel_dcache_page_addr(void *addr) { unsigned long flags; flush_kernel_dcache_page_asm(addr); purge_tlb_start(flags); pdtlb_kernel(addr); purge_tlb_end(flags); } EXPORT_SYMBOL(flush_kernel_dcache_page_addr); void clear_user_page(void *vto, unsigned long vaddr, struct page *page) { clear_page_asm(vto); if (!parisc_requires_coherency()) flush_kernel_dcache_page_asm(vto); } EXPORT_SYMBOL(clear_user_page); void copy_user_page(void *vto, void *vfrom, unsigned long vaddr, struct page *pg) { /* Copy using kernel mapping. No coherency is needed (all in kmap/kunmap) on machines that don't support non-equivalent aliasing. However, the `from' page needs to be flushed before it can be accessed through the kernel mapping. */ preempt_disable(); flush_dcache_page_asm(__pa(vfrom), vaddr); preempt_enable(); copy_page_asm(vto, vfrom); if (!parisc_requires_coherency()) flush_kernel_dcache_page_asm(vto); } EXPORT_SYMBOL(copy_user_page); #ifdef CONFIG_PA8X00 void kunmap_parisc(void *addr) { if (parisc_requires_coherency()) flush_kernel_dcache_page_addr(addr); } EXPORT_SYMBOL(kunmap_parisc); #endif void purge_tlb_entries(struct mm_struct *mm, unsigned long addr) { unsigned long flags; /* Note: purge_tlb_entries can be called at startup with no context. */ /* Disable preemption while we play with %sr1. */ preempt_disable(); mtsp(mm->context, 1); purge_tlb_start(flags); pdtlb(addr); pitlb(addr); purge_tlb_end(flags); preempt_enable(); } EXPORT_SYMBOL(purge_tlb_entries); void __flush_tlb_range(unsigned long sid, unsigned long start, unsigned long end) { unsigned long npages; npages = ((end - (start & PAGE_MASK)) + (PAGE_SIZE - 1)) >> PAGE_SHIFT; if (npages >= 512) /* 2MB of space: arbitrary, should be tuned */ flush_tlb_all(); else { unsigned long flags; mtsp(sid, 1); purge_tlb_start(flags); if (split_tlb) { while (npages--) { pdtlb(start); pitlb(start); start += PAGE_SIZE; } } else { while (npages--) { pdtlb(start); start += PAGE_SIZE; } } purge_tlb_end(flags); } } static void cacheflush_h_tmp_function(void *dummy) { flush_cache_all_local(); } void flush_cache_all(void) { on_each_cpu(cacheflush_h_tmp_function, NULL, 1); } static inline unsigned long mm_total_size(struct mm_struct *mm) { struct vm_area_struct *vma; unsigned long usize = 0; for (vma = mm->mmap; vma; vma = vma->vm_next) usize += vma->vm_end - vma->vm_start; return usize; } static inline pte_t *get_ptep(pgd_t *pgd, unsigned long addr) { pte_t *ptep = NULL; if (!pgd_none(*pgd)) { pud_t *pud = pud_offset(pgd, addr); if (!pud_none(*pud)) { pmd_t *pmd = pmd_offset(pud, addr); if (!pmd_none(*pmd)) ptep = pte_offset_map(pmd, addr); } } return ptep; } void flush_cache_mm(struct mm_struct *mm) { /* Flushing the whole cache on each cpu takes forever on rp3440, etc. So, avoid it if the mm isn't too big. */ if (mm_total_size(mm) < parisc_cache_flush_threshold) { struct vm_area_struct *vma; if (mm->context == mfsp(3)) { for (vma = mm->mmap; vma; vma = vma->vm_next) { flush_user_dcache_range_asm(vma->vm_start, vma->vm_end); if (vma->vm_flags & VM_EXEC) flush_user_icache_range_asm( vma->vm_start, vma->vm_end); } } else { pgd_t *pgd = mm->pgd; for (vma = mm->mmap; vma; vma = vma->vm_next) { unsigned long addr; for (addr = vma->vm_start; addr < vma->vm_end; addr += PAGE_SIZE) { pte_t *ptep = get_ptep(pgd, addr); if (ptep != NULL) { pte_t pte = *ptep; __flush_cache_page(vma, addr, page_to_phys(pte_page(pte))); } } } } return; } #ifdef CONFIG_SMP flush_cache_all(); #else flush_cache_all_local(); #endif } void flush_user_dcache_range(unsigned long start, unsigned long end) { if ((end - start) < parisc_cache_flush_threshold) flush_user_dcache_range_asm(start,end); else flush_data_cache(); } void flush_user_icache_range(unsigned long start, unsigned long end) { if ((end - start) < parisc_cache_flush_threshold) flush_user_icache_range_asm(start,end); else flush_instruction_cache(); } void flush_cache_range(struct vm_area_struct *vma, unsigned long start, unsigned long end) { BUG_ON(!vma->vm_mm->context); if ((end - start) < parisc_cache_flush_threshold) { if (vma->vm_mm->context == mfsp(3)) { flush_user_dcache_range_asm(start, end); if (vma->vm_flags & VM_EXEC) flush_user_icache_range_asm(start, end); } else { unsigned long addr; pgd_t *pgd = vma->vm_mm->pgd; for (addr = start & PAGE_MASK; addr < end; addr += PAGE_SIZE) { pte_t *ptep = get_ptep(pgd, addr); if (ptep != NULL) { pte_t pte = *ptep; flush_cache_page(vma, addr, pte_pfn(pte)); } } } } else { #ifdef CONFIG_SMP flush_cache_all(); #else flush_cache_all_local(); #endif } } void flush_cache_page(struct vm_area_struct *vma, unsigned long vmaddr, unsigned long pfn) { BUG_ON(!vma->vm_mm->context); flush_tlb_page(vma, vmaddr); __flush_cache_page(vma, vmaddr, page_to_phys(pfn_to_page(pfn))); } #ifdef CONFIG_PARISC_TMPALIAS void clear_user_highpage(struct page *page, unsigned long vaddr) { void *vto; unsigned long flags; /* Clear using TMPALIAS region. The page doesn't need to be flushed but the kernel mapping needs to be purged. */ vto = kmap_atomic(page, KM_USER0); /* The PA-RISC 2.0 Architecture book states on page F-6: "Before a write-capable translation is enabled, *all* non-equivalently-aliased translations must be removed from the page table and purged from the TLB. (Note that the caches are not required to be flushed at this time.) Before any non-equivalent aliased translation is re-enabled, the virtual address range for the writeable page (the entire page) must be flushed from the cache, and the write-capable translation removed from the page table and purged from the TLB." */ purge_kernel_dcache_page_asm((unsigned long)vto); purge_tlb_start(flags); pdtlb_kernel(vto); purge_tlb_end(flags); preempt_disable(); clear_user_page_asm(vto, vaddr); preempt_enable(); pagefault_enable(); /* kunmap_atomic(addr, KM_USER0); */ } void copy_user_highpage(struct page *to, struct page *from, unsigned long vaddr, struct vm_area_struct *vma) { void *vfrom, *vto; unsigned long flags; /* Copy using TMPALIAS region. This has the advantage that the `from' page doesn't need to be flushed. However, the `to' page must be flushed in copy_user_page_asm since it can be used to bring in executable code. */ vfrom = kmap_atomic(from, KM_USER0); vto = kmap_atomic(to, KM_USER1); purge_kernel_dcache_page_asm((unsigned long)vto); purge_tlb_start(flags); pdtlb_kernel(vto); pdtlb_kernel(vfrom); purge_tlb_end(flags); preempt_disable(); copy_user_page_asm(vto, vfrom, vaddr); flush_dcache_page_asm(__pa(vto), vaddr); preempt_enable(); pagefault_enable(); /* kunmap_atomic(addr, KM_USER1); */ pagefault_enable(); /* kunmap_atomic(addr, KM_USER0); */ } #endif /* CONFIG_PARISC_TMPALIAS */