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Diffstat (limited to '')
| -rw-r--r-- | arch/parisc/kernel/cache.c | 681 |
1 files changed, 681 insertions, 0 deletions
diff --git a/arch/parisc/kernel/cache.c b/arch/parisc/kernel/cache.c new file mode 100644 index 000000000..efa8d2a67 --- /dev/null +++ b/arch/parisc/kernel/cache.c @@ -0,0 +1,681 @@ +/* + * 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 <deller@gmx.de> (07-13-1999) + * Copyright (C) 1999 SuSE GmbH Nuernberg + * Copyright (C) 2000 Philipp Rumpf (prumpf@tux.org) + * + * Cache and TLB management + * + */ + +#include <linux/init.h> +#include <linux/kernel.h> +#include <linux/mm.h> +#include <linux/module.h> +#include <linux/seq_file.h> +#include <linux/pagemap.h> +#include <linux/sched.h> +#include <linux/sched/mm.h> +#include <asm/pdc.h> +#include <asm/cache.h> +#include <asm/cacheflush.h> +#include <asm/tlbflush.h> +#include <asm/page.h> +#include <asm/processor.h> +#include <asm/sections.h> +#include <asm/shmparam.h> + +int split_tlb __ro_after_init; +int dcache_stride __ro_after_init; +int icache_stride __ro_after_init; +EXPORT_SYMBOL(dcache_stride); + +void flush_dcache_page_asm(unsigned long phys_addr, unsigned long vaddr); +EXPORT_SYMBOL(flush_dcache_page_asm); +void purge_dcache_page_asm(unsigned long phys_addr, unsigned long vaddr); +void flush_icache_page_asm(unsigned long phys_addr, unsigned long vaddr); + + +/* On some machines (i.e., ones with the Merced bus), there can be + * only a single PxTLB broadcast at a time; this must be guaranteed + * by software. We need a spinlock around all TLB flushes to ensure + * this. + */ +DEFINE_SPINLOCK(pa_tlb_flush_lock); + +/* Swapper page setup lock. */ +DEFINE_SPINLOCK(pa_swapper_pg_lock); + +#if defined(CONFIG_64BIT) && defined(CONFIG_SMP) +int pa_serialize_tlb_flushes __ro_after_init; +#endif + +struct pdc_cache_info cache_info __ro_after_init; +#ifndef CONFIG_PA20 +static struct pdc_btlb_info btlb_info __ro_after_init; +#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); + +/* Virtual address of pfn. */ +#define pfn_va(pfn) __va(PFN_PHYS(pfn)) + +void +__update_cache(pte_t pte) +{ + unsigned long pfn = pte_pfn(pte); + struct page *page; + + /* We don't have pte special. As a result, we can be called with + an invalid pfn and we don't need to flush the kernel dcache page. + This occurs with FireGL card in C8000. */ + if (!pfn_valid(pfn)) + return; + + page = pfn_to_page(pfn); + if (page_mapping_file(page) && + test_bit(PG_dcache_dirty, &page->flags)) { + flush_kernel_dcache_page_addr(pfn_va(pfn)); + clear_bit(PG_dcache_dirty, &page->flags); + } else if (parisc_requires_coherency()) + flush_kernel_dcache_page_addr(pfn_va(pfn)); +} + +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("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", + cache_info.it_sp_base, + cache_info.it_sp_stride, + cache_info.it_sp_count, + cache_info.it_loop, + cache_info.it_off_base, + cache_info.it_off_stride, + cache_info.it_off_count); + + 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", + cache_info.dt_sp_base, + cache_info.dt_sp_stride, + cache_info.dt_sp_count, + cache_info.dt_loop, + cache_info.dt_off_base, + cache_info.dt_off_stride, + cache_info.dt_off_count); + + 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 sr %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_sr); + + printk("I-TLB conf: sh %d page %d cst %d aid %d sr %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_sr); +#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 __init 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) +{ + preempt_disable(); + flush_dcache_page_asm(physaddr, vmaddr); + if (vma->vm_flags & VM_EXEC) + flush_icache_page_asm(physaddr, vmaddr); + preempt_enable(); +} + +static inline void +__purge_cache_page(struct vm_area_struct *vma, unsigned long vmaddr, + unsigned long physaddr) +{ + preempt_disable(); + purge_dcache_page_asm(physaddr, vmaddr); + if (vma->vm_flags & VM_EXEC) + flush_icache_page_asm(physaddr, vmaddr); + preempt_enable(); +} + +void flush_dcache_page(struct page *page) +{ + struct address_space *mapping = page_mapping_file(page); + struct vm_area_struct *mpnt; + unsigned long offset; + unsigned long addr, old_addr = 0; + unsigned long flags; + 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; + + /* 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_irqsave(mapping, flags); + 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 & (SHM_COLOUR - 1)) + != (addr & (SHM_COLOUR - 1))) { + __flush_cache_page(mpnt, addr, page_to_phys(page)); + if (parisc_requires_coherency() && old_addr) + printk(KERN_ERR "INEQUIVALENT ALIASES 0x%lx and 0x%lx in file %pD\n", old_addr, addr, mpnt->vm_file); + old_addr = addr; + } + } + flush_dcache_mmap_unlock_irqrestore(mapping, flags); +} +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 */ +static unsigned long parisc_cache_flush_threshold __ro_after_init = FLUSH_THRESHOLD; + +#define FLUSH_TLB_THRESHOLD (16*1024) /* 16 KiB minimum TLB threshold */ +static unsigned long parisc_tlb_flush_threshold __ro_after_init = ~0UL; + +void __init parisc_setup_cache_timing(void) +{ + unsigned long rangetime, alltime; + unsigned long size; + unsigned long threshold; + + 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); + + threshold = L1_CACHE_ALIGN(size * alltime / rangetime); + if (threshold > cache_info.dc_size) + threshold = cache_info.dc_size; + if (threshold) + parisc_cache_flush_threshold = threshold; + printk(KERN_INFO "Cache flush threshold set to %lu KiB\n", + parisc_cache_flush_threshold/1024); + + /* calculate TLB flush threshold */ + + /* On SMP machines, skip the TLB measure of kernel text which + * has been mapped as huge pages. */ + if (num_online_cpus() > 1 && !parisc_requires_coherency()) { + threshold = max(cache_info.it_size, cache_info.dt_size); + threshold *= PAGE_SIZE; + threshold /= num_online_cpus(); + goto set_tlb_threshold; + } + + size = (unsigned long)_end - (unsigned long)_text; + rangetime = mfctl(16); + flush_tlb_kernel_range((unsigned long)_text, (unsigned long)_end); + rangetime = mfctl(16) - rangetime; + + alltime = mfctl(16); + flush_tlb_all(); + alltime = mfctl(16) - alltime; + + printk(KERN_INFO "Whole TLB flush %lu cycles, Range flush %lu bytes %lu cycles\n", + alltime, size, rangetime); + + threshold = PAGE_ALIGN((num_online_cpus() * size * alltime) / rangetime); + printk(KERN_INFO "Calculated TLB flush threshold %lu KiB\n", + threshold/1024); + +set_tlb_threshold: + if (threshold > FLUSH_TLB_THRESHOLD) + parisc_tlb_flush_threshold = threshold; + else + parisc_tlb_flush_threshold = FLUSH_TLB_THRESHOLD; + + printk(KERN_INFO "TLB flush threshold set to %lu KiB\n", + parisc_tlb_flush_threshold/1024); +} + +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 copy_user_page(void *vto, void *vfrom, unsigned long vaddr, + struct page *pg) +{ + /* Copy using kernel mapping. No coherency is needed (all in + kunmap) for the `to' page. However, the `from' page needs to + be flushed through a mapping equivalent to the user mapping + before it can be accessed through the kernel mapping. */ + preempt_disable(); + flush_dcache_page_asm(__pa(vfrom), vaddr); + copy_page_asm(vto, vfrom); + preempt_enable(); +} +EXPORT_SYMBOL(copy_user_page); + +/* __flush_tlb_range() + * + * returns 1 if all TLBs were flushed. + */ +int __flush_tlb_range(unsigned long sid, unsigned long start, + unsigned long end) +{ + unsigned long flags; + + if ((!IS_ENABLED(CONFIG_SMP) || !arch_irqs_disabled()) && + end - start >= parisc_tlb_flush_threshold) { + flush_tlb_all(); + return 1; + } + + /* Purge TLB entries for small ranges using the pdtlb and + pitlb instructions. These instructions execute locally + but cause a purge request to be broadcast to other TLBs. */ + while (start < end) { + purge_tlb_start(flags); + mtsp(sid, 1); + pdtlb(start); + pitlb(start); + purge_tlb_end(flags); + start += PAGE_SIZE; + } + return 0; +} + +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)) { + p4d_t *p4d = p4d_offset(pgd, addr); + if (!p4d_none(*p4d)) { + pud_t *pud = pud_offset(p4d, 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) +{ + struct vm_area_struct *vma; + pgd_t *pgd; + + /* Flushing the whole cache on each cpu takes forever on + rp3440, etc. So, avoid it if the mm isn't too big. */ + if ((!IS_ENABLED(CONFIG_SMP) || !arch_irqs_disabled()) && + mm_total_size(mm) >= parisc_cache_flush_threshold) { + if (mm->context) + flush_tlb_all(); + flush_cache_all(); + return; + } + + 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); + flush_tlb_range(vma, vma->vm_start, vma->vm_end); + } + return; + } + + 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) { + unsigned long pfn; + pte_t *ptep = get_ptep(pgd, addr); + if (!ptep) + continue; + pfn = pte_pfn(*ptep); + if (!pfn_valid(pfn)) + continue; + if (unlikely(mm->context)) { + flush_tlb_page(vma, addr); + __flush_cache_page(vma, addr, PFN_PHYS(pfn)); + } else { + __purge_cache_page(vma, addr, PFN_PHYS(pfn)); + } + } + } +} + +void flush_cache_range(struct vm_area_struct *vma, + unsigned long start, unsigned long end) +{ + pgd_t *pgd; + unsigned long addr; + + if ((!IS_ENABLED(CONFIG_SMP) || !arch_irqs_disabled()) && + end - start >= parisc_cache_flush_threshold) { + if (vma->vm_mm->context) + flush_tlb_range(vma, start, end); + flush_cache_all(); + return; + } + + 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); + flush_tlb_range(vma, start, end); + return; + } + + pgd = vma->vm_mm->pgd; + for (addr = vma->vm_start; addr < vma->vm_end; addr += PAGE_SIZE) { + unsigned long pfn; + pte_t *ptep = get_ptep(pgd, addr); + if (!ptep) + continue; + pfn = pte_pfn(*ptep); + if (pfn_valid(pfn)) { + if (unlikely(vma->vm_mm->context)) { + flush_tlb_page(vma, addr); + __flush_cache_page(vma, addr, PFN_PHYS(pfn)); + } else { + __purge_cache_page(vma, addr, PFN_PHYS(pfn)); + } + } + } +} + +void +flush_cache_page(struct vm_area_struct *vma, unsigned long vmaddr, unsigned long pfn) +{ + if (pfn_valid(pfn)) { + if (likely(vma->vm_mm->context)) { + flush_tlb_page(vma, vmaddr); + __flush_cache_page(vma, vmaddr, PFN_PHYS(pfn)); + } else { + __purge_cache_page(vma, vmaddr, PFN_PHYS(pfn)); + } + } +} + +void flush_kernel_vmap_range(void *vaddr, int size) +{ + unsigned long start = (unsigned long)vaddr; + unsigned long end = start + size; + + if ((!IS_ENABLED(CONFIG_SMP) || !arch_irqs_disabled()) && + (unsigned long)size >= parisc_cache_flush_threshold) { + flush_tlb_kernel_range(start, end); + flush_data_cache(); + return; + } + + flush_kernel_dcache_range_asm(start, end); + flush_tlb_kernel_range(start, end); +} +EXPORT_SYMBOL(flush_kernel_vmap_range); + +void invalidate_kernel_vmap_range(void *vaddr, int size) +{ + unsigned long start = (unsigned long)vaddr; + unsigned long end = start + size; + + if ((!IS_ENABLED(CONFIG_SMP) || !arch_irqs_disabled()) && + (unsigned long)size >= parisc_cache_flush_threshold) { + flush_tlb_kernel_range(start, end); + flush_data_cache(); + return; + } + + purge_kernel_dcache_range_asm(start, end); + flush_tlb_kernel_range(start, end); +} +EXPORT_SYMBOL(invalidate_kernel_vmap_range); |