1 files changed, 366 insertions, 0 deletions

diff --git a/arch/parisc/kernel/cache.c b/arch/parisc/kernel/cache.c
new file mode 100644
index 000000000000..f46a07a79218
--- /dev/null
+++ b/arch/parisc/kernel/cache.c
@@ -0,0 +1,366 @@
+/* $Id: cache.c,v 1.4 2000/01/25 00:11:38 prumpf Exp $
+ *
+ * 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 Helge Deller (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 <asm/pdc.h>
+#include <asm/cache.h>
+#include <asm/cacheflush.h>
+#include <asm/tlbflush.h>
+#include <asm/system.h>
+#include <asm/page.h>
+#include <asm/pgalloc.h>
+#include <asm/processor.h>
+
+int split_tlb;
+int dcache_stride;
+int icache_stride;
+EXPORT_SYMBOL(dcache_stride);
+
+
+#if defined(CONFIG_SMP)
+/* 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);
+EXPORT_SYMBOL(pa_tlb_lock);
+#endif
+
+struct pdc_cache_info cache_info;
+#ifndef CONFIG_PA20
+static struct pdc_btlb_info btlb_info;
+#endif
+
+#ifdef CONFIG_SMP
+void
+flush_data_cache(void)
+{
+        on_each_cpu((void (*)(void *))flush_data_cache_local, NULL, 1, 1);
+}
+void 
+flush_instruction_cache(void)
+{
+        on_each_cpu((void (*)(void *))flush_instruction_cache_local, NULL, 1, 1);
+}
+#endif
+
+void
+flush_cache_all_local(void)
+{
+        flush_instruction_cache_local();
+        flush_data_cache_local();
+}
+EXPORT_SYMBOL(flush_cache_all_local);
+
+/* flushes EVERYTHING (tlb & cache) */
+
+void
+flush_all_caches(void)
+{
+        flush_cache_all();
+        flush_tlb_all();
+}
+EXPORT_SYMBOL(flush_all_caches);
+
+void
+update_mmu_cache(struct vm_area_struct *vma, unsigned long address, pte_t pte)
+{
+        struct page *page = pte_page(pte);
+
+        if (pfn_valid(page_to_pfn(page)) && page_mapping(page) &&
+            test_bit(PG_dcache_dirty, &page->flags)) {
+
+                flush_kernel_dcache_page(page_address(page));
+                clear_bit(PG_dcache_dirty, &page->flags);
+        }
+}
+
+void
+show_cache_info(struct seq_file *m)
+{
+        seq_printf(m, "I-cache\t\t: %ld KB\n", 
+                cache_info.ic_size/1024 );
+        seq_printf(m, "D-cache\t\t: %ld KB (%s%s, %d-way associative)\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_conf.cc_assoc)
+        );
+
+        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 assoc %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_assoc);
+
+        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 assoc %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_assoc);
+
+        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))
+         */
+#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;
+
+        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);
+}
+
+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;
+        pgoff_t pgoff;
+        pte_t *pte;
+        unsigned long pfn = page_to_pfn(page);
+
+
+        if (mapping && !mapping_mapped(mapping)) {
+                set_bit(PG_dcache_dirty, &page->flags);
+                return;
+        }
+
+        flush_kernel_dcache_page(page_address(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;
+
+                /* Flush instructions produce non access tlb misses.
+                 * On PA, we nullify these instructions rather than
+                 * taking a page fault if the pte doesn't exist.
+                 * This is just for speed.  If the page translation
+                 * isn't there, there's no point exciting the
+                 * nadtlb handler into a nullification frenzy */
+
+
+                if(!(pte = translation_exists(mpnt, addr)))
+                        continue;
+
+                /* make sure we really have this page: the private
+                 * mappings may cover this area but have COW'd this
+                 * particular page */
+                if(pte_pfn(*pte) != pfn)
+                        continue;
+
+                __flush_cache_page(mpnt, addr);
+
+                break;
+        }
+        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);
+EXPORT_SYMBOL(flush_data_cache_local);
+EXPORT_SYMBOL(flush_kernel_icache_range_asm);
+
+void clear_user_page_asm(void *page, unsigned long vaddr)
+{
+        /* This function is implemented in assembly in pacache.S */
+        extern void __clear_user_page_asm(void *page, unsigned long vaddr);
+
+        purge_tlb_start();
+        __clear_user_page_asm(page, vaddr);
+        purge_tlb_end();
+}
+
+#define FLUSH_THRESHOLD 0x80000 /* 0.5MB */
+int parisc_cache_flush_threshold = FLUSH_THRESHOLD;
+
+void parisc_setup_cache_timing(void)
+{
+        unsigned long rangetime, alltime;
+        extern char _text;      /* start of kernel code, defined by linker */
+        extern char _end;       /* end of BSS, defined by linker */
+        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;
+
+        printk("Setting cache flush threshold to %x (%d CPUs online)\n", parisc_cache_flush_threshold, num_online_cpus());
+}