580 lines
15 KiB
C
580 lines
15 KiB
C
/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 1999-2006 Helge Deller <deller@gmx.de> (07-13-1999)
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* Copyright (C) 1999 SuSE GmbH Nuernberg
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* Copyright (C) 2000 Philipp Rumpf (prumpf@tux.org)
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*
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* Cache and TLB management
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*
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*/
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/module.h>
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#include <linux/seq_file.h>
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#include <linux/pagemap.h>
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#include <linux/sched.h>
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#include <asm/pdc.h>
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#include <asm/cache.h>
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#include <asm/cacheflush.h>
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#include <asm/tlbflush.h>
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#include <asm/system.h>
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#include <asm/page.h>
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#include <asm/pgalloc.h>
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#include <asm/processor.h>
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#include <asm/sections.h>
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int split_tlb __read_mostly;
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int dcache_stride __read_mostly;
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int icache_stride __read_mostly;
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EXPORT_SYMBOL(dcache_stride);
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/* On some machines (e.g. ones with the Merced bus), there can be
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* only a single PxTLB broadcast at a time; this must be guaranteed
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* by software. We put a spinlock around all TLB flushes to
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* ensure this.
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*/
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DEFINE_SPINLOCK(pa_tlb_lock);
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struct pdc_cache_info cache_info __read_mostly;
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#ifndef CONFIG_PA20
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static struct pdc_btlb_info btlb_info __read_mostly;
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#endif
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#ifdef CONFIG_SMP
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void
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flush_data_cache(void)
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{
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on_each_cpu(flush_data_cache_local, NULL, 1);
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}
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void
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flush_instruction_cache(void)
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{
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on_each_cpu(flush_instruction_cache_local, NULL, 1);
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}
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#endif
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void
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flush_cache_all_local(void)
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{
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flush_instruction_cache_local(NULL);
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flush_data_cache_local(NULL);
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}
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EXPORT_SYMBOL(flush_cache_all_local);
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void
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update_mmu_cache(struct vm_area_struct *vma, unsigned long address, pte_t pte)
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{
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struct page *page = pte_page(pte);
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if (pfn_valid(page_to_pfn(page)) && page_mapping(page) &&
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test_bit(PG_dcache_dirty, &page->flags)) {
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flush_kernel_dcache_page(page);
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clear_bit(PG_dcache_dirty, &page->flags);
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} else if (parisc_requires_coherency())
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flush_kernel_dcache_page(page);
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}
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void
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show_cache_info(struct seq_file *m)
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{
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char buf[32];
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seq_printf(m, "I-cache\t\t: %ld KB\n",
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cache_info.ic_size/1024 );
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if (cache_info.dc_loop != 1)
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snprintf(buf, 32, "%lu-way associative", cache_info.dc_loop);
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seq_printf(m, "D-cache\t\t: %ld KB (%s%s, %s)\n",
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cache_info.dc_size/1024,
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(cache_info.dc_conf.cc_wt ? "WT":"WB"),
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(cache_info.dc_conf.cc_sh ? ", shared I/D":""),
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((cache_info.dc_loop == 1) ? "direct mapped" : buf));
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seq_printf(m, "ITLB entries\t: %ld\n" "DTLB entries\t: %ld%s\n",
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cache_info.it_size,
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cache_info.dt_size,
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cache_info.dt_conf.tc_sh ? " - shared with ITLB":""
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);
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#ifndef CONFIG_PA20
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/* BTLB - Block TLB */
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if (btlb_info.max_size==0) {
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seq_printf(m, "BTLB\t\t: not supported\n" );
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} else {
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seq_printf(m,
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"BTLB fixed\t: max. %d pages, pagesize=%d (%dMB)\n"
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"BTLB fix-entr.\t: %d instruction, %d data (%d combined)\n"
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"BTLB var-entr.\t: %d instruction, %d data (%d combined)\n",
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btlb_info.max_size, (int)4096,
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btlb_info.max_size>>8,
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btlb_info.fixed_range_info.num_i,
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btlb_info.fixed_range_info.num_d,
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btlb_info.fixed_range_info.num_comb,
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btlb_info.variable_range_info.num_i,
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btlb_info.variable_range_info.num_d,
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btlb_info.variable_range_info.num_comb
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);
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}
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#endif
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}
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void __init
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parisc_cache_init(void)
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{
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if (pdc_cache_info(&cache_info) < 0)
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panic("parisc_cache_init: pdc_cache_info failed");
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#if 0
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printk("ic_size %lx dc_size %lx it_size %lx\n",
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cache_info.ic_size,
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cache_info.dc_size,
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cache_info.it_size);
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printk("DC base 0x%lx stride 0x%lx count 0x%lx loop 0x%lx\n",
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cache_info.dc_base,
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cache_info.dc_stride,
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cache_info.dc_count,
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cache_info.dc_loop);
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printk("dc_conf = 0x%lx alias %d blk %d line %d shift %d\n",
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*(unsigned long *) (&cache_info.dc_conf),
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cache_info.dc_conf.cc_alias,
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cache_info.dc_conf.cc_block,
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cache_info.dc_conf.cc_line,
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cache_info.dc_conf.cc_shift);
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printk(" wt %d sh %d cst %d hv %d\n",
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cache_info.dc_conf.cc_wt,
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cache_info.dc_conf.cc_sh,
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cache_info.dc_conf.cc_cst,
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cache_info.dc_conf.cc_hv);
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printk("IC base 0x%lx stride 0x%lx count 0x%lx loop 0x%lx\n",
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cache_info.ic_base,
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cache_info.ic_stride,
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cache_info.ic_count,
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cache_info.ic_loop);
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printk("ic_conf = 0x%lx alias %d blk %d line %d shift %d\n",
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*(unsigned long *) (&cache_info.ic_conf),
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cache_info.ic_conf.cc_alias,
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cache_info.ic_conf.cc_block,
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cache_info.ic_conf.cc_line,
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cache_info.ic_conf.cc_shift);
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printk(" wt %d sh %d cst %d hv %d\n",
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cache_info.ic_conf.cc_wt,
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cache_info.ic_conf.cc_sh,
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cache_info.ic_conf.cc_cst,
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cache_info.ic_conf.cc_hv);
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printk("D-TLB conf: sh %d page %d cst %d aid %d pad1 %d \n",
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cache_info.dt_conf.tc_sh,
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cache_info.dt_conf.tc_page,
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cache_info.dt_conf.tc_cst,
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cache_info.dt_conf.tc_aid,
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cache_info.dt_conf.tc_pad1);
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printk("I-TLB conf: sh %d page %d cst %d aid %d pad1 %d \n",
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cache_info.it_conf.tc_sh,
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cache_info.it_conf.tc_page,
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cache_info.it_conf.tc_cst,
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cache_info.it_conf.tc_aid,
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cache_info.it_conf.tc_pad1);
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#endif
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split_tlb = 0;
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if (cache_info.dt_conf.tc_sh == 0 || cache_info.dt_conf.tc_sh == 2) {
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if (cache_info.dt_conf.tc_sh == 2)
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printk(KERN_WARNING "Unexpected TLB configuration. "
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"Will flush I/D separately (could be optimized).\n");
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split_tlb = 1;
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}
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/* "New and Improved" version from Jim Hull
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* (1 << (cc_block-1)) * (cc_line << (4 + cnf.cc_shift))
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* The following CAFL_STRIDE is an optimized version, see
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* http://lists.parisc-linux.org/pipermail/parisc-linux/2004-June/023625.html
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* http://lists.parisc-linux.org/pipermail/parisc-linux/2004-June/023671.html
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*/
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#define CAFL_STRIDE(cnf) (cnf.cc_line << (3 + cnf.cc_block + cnf.cc_shift))
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dcache_stride = CAFL_STRIDE(cache_info.dc_conf);
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icache_stride = CAFL_STRIDE(cache_info.ic_conf);
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#undef CAFL_STRIDE
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#ifndef CONFIG_PA20
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if (pdc_btlb_info(&btlb_info) < 0) {
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memset(&btlb_info, 0, sizeof btlb_info);
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}
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#endif
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if ((boot_cpu_data.pdc.capabilities & PDC_MODEL_NVA_MASK) ==
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PDC_MODEL_NVA_UNSUPPORTED) {
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printk(KERN_WARNING "parisc_cache_init: Only equivalent aliasing supported!\n");
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#if 0
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panic("SMP kernel required to avoid non-equivalent aliasing");
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#endif
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}
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}
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void disable_sr_hashing(void)
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{
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int srhash_type, retval;
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unsigned long space_bits;
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switch (boot_cpu_data.cpu_type) {
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case pcx: /* We shouldn't get this far. setup.c should prevent it. */
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BUG();
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return;
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case pcxs:
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case pcxt:
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case pcxt_:
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srhash_type = SRHASH_PCXST;
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break;
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case pcxl:
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srhash_type = SRHASH_PCXL;
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break;
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case pcxl2: /* pcxl2 doesn't support space register hashing */
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return;
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default: /* Currently all PA2.0 machines use the same ins. sequence */
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srhash_type = SRHASH_PA20;
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break;
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}
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disable_sr_hashing_asm(srhash_type);
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retval = pdc_spaceid_bits(&space_bits);
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/* If this procedure isn't implemented, don't panic. */
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if (retval < 0 && retval != PDC_BAD_OPTION)
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panic("pdc_spaceid_bits call failed.\n");
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if (space_bits != 0)
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panic("SpaceID hashing is still on!\n");
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}
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/* Simple function to work out if we have an existing address translation
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* for a user space vma. */
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static inline int translation_exists(struct vm_area_struct *vma,
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unsigned long addr, unsigned long pfn)
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{
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pgd_t *pgd = pgd_offset(vma->vm_mm, addr);
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pmd_t *pmd;
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pte_t pte;
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if(pgd_none(*pgd))
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return 0;
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pmd = pmd_offset(pgd, addr);
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if(pmd_none(*pmd) || pmd_bad(*pmd))
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return 0;
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/* We cannot take the pte lock here: flush_cache_page is usually
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* called with pte lock already held. Whereas flush_dcache_page
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* takes flush_dcache_mmap_lock, which is lower in the hierarchy:
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* the vma itself is secure, but the pte might come or go racily.
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*/
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pte = *pte_offset_map(pmd, addr);
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/* But pte_unmap() does nothing on this architecture */
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/* Filter out coincidental file entries and swap entries */
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if (!(pte_val(pte) & (_PAGE_FLUSH|_PAGE_PRESENT)))
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return 0;
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return pte_pfn(pte) == pfn;
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}
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/* Private function to flush a page from the cache of a non-current
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* process. cr25 contains the Page Directory of the current user
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* process; we're going to hijack both it and the user space %sr3 to
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* temporarily make the non-current process current. We have to do
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* this because cache flushing may cause a non-access tlb miss which
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* the handlers have to fill in from the pgd of the non-current
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* process. */
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static inline void
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flush_user_cache_page_non_current(struct vm_area_struct *vma,
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unsigned long vmaddr)
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{
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/* save the current process space and pgd */
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unsigned long space = mfsp(3), pgd = mfctl(25);
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/* we don't mind taking interrupts since they may not
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* do anything with user space, but we can't
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* be preempted here */
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preempt_disable();
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/* make us current */
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mtctl(__pa(vma->vm_mm->pgd), 25);
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mtsp(vma->vm_mm->context, 3);
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flush_user_dcache_page(vmaddr);
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if(vma->vm_flags & VM_EXEC)
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flush_user_icache_page(vmaddr);
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/* put the old current process back */
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mtsp(space, 3);
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mtctl(pgd, 25);
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preempt_enable();
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}
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static inline void
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__flush_cache_page(struct vm_area_struct *vma, unsigned long vmaddr)
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{
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if (likely(vma->vm_mm->context == mfsp(3))) {
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flush_user_dcache_page(vmaddr);
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if (vma->vm_flags & VM_EXEC)
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flush_user_icache_page(vmaddr);
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} else {
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flush_user_cache_page_non_current(vma, vmaddr);
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}
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}
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void flush_dcache_page(struct page *page)
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{
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struct address_space *mapping = page_mapping(page);
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struct vm_area_struct *mpnt;
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struct prio_tree_iter iter;
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unsigned long offset;
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unsigned long addr;
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pgoff_t pgoff;
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unsigned long pfn = page_to_pfn(page);
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if (mapping && !mapping_mapped(mapping)) {
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set_bit(PG_dcache_dirty, &page->flags);
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return;
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}
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flush_kernel_dcache_page(page);
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if (!mapping)
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return;
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pgoff = page->index << (PAGE_CACHE_SHIFT - PAGE_SHIFT);
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/* We have carefully arranged in arch_get_unmapped_area() that
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* *any* mappings of a file are always congruently mapped (whether
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* declared as MAP_PRIVATE or MAP_SHARED), so we only need
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* to flush one address here for them all to become coherent */
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flush_dcache_mmap_lock(mapping);
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vma_prio_tree_foreach(mpnt, &iter, &mapping->i_mmap, pgoff, pgoff) {
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offset = (pgoff - mpnt->vm_pgoff) << PAGE_SHIFT;
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addr = mpnt->vm_start + offset;
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/* Flush instructions produce non access tlb misses.
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* On PA, we nullify these instructions rather than
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* taking a page fault if the pte doesn't exist.
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* This is just for speed. If the page translation
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* isn't there, there's no point exciting the
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* nadtlb handler into a nullification frenzy.
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*
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* Make sure we really have this page: the private
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* mappings may cover this area but have COW'd this
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* particular page.
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*/
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if (translation_exists(mpnt, addr, pfn)) {
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__flush_cache_page(mpnt, addr);
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break;
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}
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}
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flush_dcache_mmap_unlock(mapping);
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}
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EXPORT_SYMBOL(flush_dcache_page);
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/* Defined in arch/parisc/kernel/pacache.S */
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EXPORT_SYMBOL(flush_kernel_dcache_range_asm);
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EXPORT_SYMBOL(flush_kernel_dcache_page_asm);
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EXPORT_SYMBOL(flush_data_cache_local);
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EXPORT_SYMBOL(flush_kernel_icache_range_asm);
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void clear_user_page_asm(void *page, unsigned long vaddr)
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{
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unsigned long flags;
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/* This function is implemented in assembly in pacache.S */
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extern void __clear_user_page_asm(void *page, unsigned long vaddr);
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purge_tlb_start(flags);
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__clear_user_page_asm(page, vaddr);
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purge_tlb_end(flags);
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}
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#define FLUSH_THRESHOLD 0x80000 /* 0.5MB */
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int parisc_cache_flush_threshold __read_mostly = FLUSH_THRESHOLD;
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void __init parisc_setup_cache_timing(void)
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{
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unsigned long rangetime, alltime;
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unsigned long size;
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alltime = mfctl(16);
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flush_data_cache();
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alltime = mfctl(16) - alltime;
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size = (unsigned long)(_end - _text);
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rangetime = mfctl(16);
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flush_kernel_dcache_range((unsigned long)_text, size);
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rangetime = mfctl(16) - rangetime;
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printk(KERN_DEBUG "Whole cache flush %lu cycles, flushing %lu bytes %lu cycles\n",
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alltime, size, rangetime);
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/* Racy, but if we see an intermediate value, it's ok too... */
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parisc_cache_flush_threshold = size * alltime / rangetime;
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parisc_cache_flush_threshold = (parisc_cache_flush_threshold + L1_CACHE_BYTES - 1) &~ (L1_CACHE_BYTES - 1);
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if (!parisc_cache_flush_threshold)
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parisc_cache_flush_threshold = FLUSH_THRESHOLD;
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if (parisc_cache_flush_threshold > cache_info.dc_size)
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parisc_cache_flush_threshold = cache_info.dc_size;
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printk(KERN_INFO "Setting cache flush threshold to %x (%d CPUs online)\n", parisc_cache_flush_threshold, num_online_cpus());
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}
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extern void purge_kernel_dcache_page(unsigned long);
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extern void clear_user_page_asm(void *page, unsigned long vaddr);
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void clear_user_page(void *page, unsigned long vaddr, struct page *pg)
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{
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unsigned long flags;
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purge_kernel_dcache_page((unsigned long)page);
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purge_tlb_start(flags);
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pdtlb_kernel(page);
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purge_tlb_end(flags);
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clear_user_page_asm(page, vaddr);
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}
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EXPORT_SYMBOL(clear_user_page);
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void flush_kernel_dcache_page_addr(void *addr)
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{
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unsigned long flags;
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flush_kernel_dcache_page_asm(addr);
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purge_tlb_start(flags);
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pdtlb_kernel(addr);
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purge_tlb_end(flags);
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}
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EXPORT_SYMBOL(flush_kernel_dcache_page_addr);
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void copy_user_page(void *vto, void *vfrom, unsigned long vaddr,
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struct page *pg)
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{
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/* no coherency needed (all in kmap/kunmap) */
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copy_user_page_asm(vto, vfrom);
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if (!parisc_requires_coherency())
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flush_kernel_dcache_page_asm(vto);
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}
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EXPORT_SYMBOL(copy_user_page);
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#ifdef CONFIG_PA8X00
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void kunmap_parisc(void *addr)
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{
|
|
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
|
|
}
|
|
|
|
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)
|
|
{
|
|
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);
|
|
} else {
|
|
flush_cache_all();
|
|
}
|
|
}
|
|
|
|
void
|
|
flush_cache_page(struct vm_area_struct *vma, unsigned long vmaddr, unsigned long pfn)
|
|
{
|
|
BUG_ON(!vma->vm_mm->context);
|
|
|
|
if (likely(translation_exists(vma, vmaddr, pfn)))
|
|
__flush_cache_page(vma, vmaddr);
|
|
|
|
}
|