/* * 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 <asm/pdc.h>#include <asm/cache.h>#include <asm/cacheflush.h>#include <asm/tlbflush.h>#include <asm/page.h>#include <asm/pgalloc.h>#include <asm/processor.h>#include <asm/sections.h>#include <asm/shmparam.h> 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_PA20static struct pdc_btlb_info btlb_info __read_mostly;#endif #ifdef CONFIG_SMPvoidflush_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 voidflush_cache_all_local(void){	flush_instruction_cache_local(NULL);	flush_data_cache_local(NULL);}EXPORT_SYMBOL(flush_cache_all_local); voidupdate_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);} voidshow_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;	struct prio_tree_iter iter;	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_prio_tree_foreach(mpnt, &iter, &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); void clear_user_page_asm(void *page, unsigned long vaddr){	unsigned long flags;	/* This function is implemented in assembly in pacache.S */	extern void __clear_user_page_asm(void *page, unsigned long vaddr); 	purge_tlb_start(flags);	__clear_user_page_asm(page, vaddr);	purge_tlb_end(flags);} #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(unsigned long);extern void clear_user_page_asm(void *page, unsigned long vaddr); void clear_user_page(void *page, unsigned long vaddr, struct page *pg){	unsigned long flags; 	purge_kernel_dcache_page((unsigned long)page);	purge_tlb_start(flags);	pdtlb_kernel(page);	purge_tlb_end(flags);	clear_user_page_asm(page, vaddr);}EXPORT_SYMBOL(clear_user_page); 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){	/* no coherency needed (all in kmap/kunmap) */	copy_user_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 __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);} void flush_cache_mm(struct mm_struct *mm){#ifdef CONFIG_SMP	flush_cache_all();#else	flush_cache_all_local();#endif} voidflush_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();} voidflush_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){	int sr3; 	BUG_ON(!vma->vm_mm->context); 	sr3 = mfsp(3);	if (vma->vm_mm->context == sr3) {		flush_user_dcache_range(start,end);		flush_user_icache_range(start,end);

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