diff options
| -rw-r--r-- | arch/sh/mm/Makefile | 4 | ||||
| -rw-r--r-- | arch/sh/mm/cache-debugfs.c | 147 |
2 files changed, 151 insertions, 0 deletions
diff --git a/arch/sh/mm/Makefile b/arch/sh/mm/Makefile index da37d86e65eb..3ffd7f68c0a2 100644 --- a/arch/sh/mm/Makefile +++ b/arch/sh/mm/Makefile @@ -17,6 +17,10 @@ mmu-$(CONFIG_MMU) := fault.o clear_page.o copy_page.o tlb-flush.o \ obj-y += $(mmu-y) +ifdef CONFIG_DEBUG_FS +obj-$(CONFIG_CPU_SH4) += cache-debugfs.o +endif + ifdef CONFIG_MMU obj-$(CONFIG_CPU_SH3) += tlb-sh3.o obj-$(CONFIG_CPU_SH4) += tlb-sh4.o pg-sh4.o diff --git a/arch/sh/mm/cache-debugfs.c b/arch/sh/mm/cache-debugfs.c new file mode 100644 index 000000000000..a22d914e4d15 --- /dev/null +++ b/arch/sh/mm/cache-debugfs.c @@ -0,0 +1,147 @@ +/* + * debugfs ops for the L1 cache + * + * Copyright (C) 2006 Paul Mundt + * + * 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. + */ +#include <linux/init.h> +#include <linux/module.h> +#include <linux/debugfs.h> +#include <linux/seq_file.h> +#include <asm/processor.h> +#include <asm/uaccess.h> +#include <asm/cache.h> +#include <asm/io.h> + +enum cache_type { + CACHE_TYPE_ICACHE, + CACHE_TYPE_DCACHE, + CACHE_TYPE_UNIFIED, +}; + +static int cache_seq_show(struct seq_file *file, void *iter) +{ + unsigned int cache_type = (unsigned int)file->private; + struct cache_info *cache; + unsigned int waysize, way, cache_size; + unsigned long ccr, base; + static unsigned long addrstart = 0; + + /* + * Go uncached immediately so we don't skew the results any + * more than we already are.. + */ + jump_to_P2(); + + ccr = ctrl_inl(CCR); + if ((ccr & CCR_CACHE_ENABLE) == 0) { + back_to_P1(); + + seq_printf(file, "disabled\n"); + return 0; + } + + if (cache_type == CACHE_TYPE_DCACHE) { + base = CACHE_OC_ADDRESS_ARRAY; + cache = &cpu_data->dcache; + } else { + base = CACHE_IC_ADDRESS_ARRAY; + cache = &cpu_data->icache; + } + + /* + * Due to the amount of data written out (depending on the cache size), + * we may be iterated over multiple times. In this case, keep track of + * the entry position in addrstart, and rewind it when we've hit the + * end of the cache. + * + * Likewise, the same code is used for multiple caches, so care must + * be taken for bouncing addrstart back and forth so the appropriate + * cache is hit. + */ + cache_size = cache->ways * cache->sets * cache->linesz; + if (((addrstart & 0xff000000) != base) || + (addrstart & 0x00ffffff) > cache_size) + addrstart = base; + + waysize = cache->sets; + + /* + * If the OC is already in RAM mode, we only have + * half of the entries to consider.. + */ + if ((ccr & CCR_CACHE_ORA) && cache_type == CACHE_TYPE_DCACHE) + waysize >>= 1; + + waysize <<= cache->entry_shift; + + for (way = 0; way < cache->ways; way++) { + unsigned long addr; + unsigned int line; + + seq_printf(file, "-----------------------------------------\n"); + seq_printf(file, "Way %d\n", way); + seq_printf(file, "-----------------------------------------\n"); + + for (addr = addrstart, line = 0; + addr < addrstart + waysize; + addr += cache->linesz, line++) { + unsigned long data = ctrl_inl(addr); + + /* Check the V bit, ignore invalid cachelines */ + if ((data & 1) == 0) + continue; + + /* U: Dirty, cache tag is 10 bits up */ + seq_printf(file, "%3d: %c 0x%lx\n", + line, data & 2 ? 'U' : ' ', + data & 0x1ffffc00); + } + + addrstart += cache->way_incr; + } + + back_to_P1(); + + return 0; +} + +static int cache_debugfs_open(struct inode *inode, struct file *file) +{ + return single_open(file, cache_seq_show, inode->u.generic_ip); +} + +static struct file_operations cache_debugfs_fops = { + .owner = THIS_MODULE, + .open = cache_debugfs_open, + .read = seq_read, + .llseek = seq_lseek, + .release = seq_release, +}; + +static int __init cache_debugfs_init(void) +{ + struct dentry *dcache_dentry, *icache_dentry; + + dcache_dentry = debugfs_create_file("dcache", S_IRUSR, NULL, + (unsigned int *)CACHE_TYPE_DCACHE, + &cache_debugfs_fops); + if (IS_ERR(dcache_dentry)) + return PTR_ERR(dcache_dentry); + + icache_dentry = debugfs_create_file("icache", S_IRUSR, NULL, + (unsigned int *)CACHE_TYPE_ICACHE, + &cache_debugfs_fops); + if (IS_ERR(icache_dentry)) { + debugfs_remove(dcache_dentry); + return PTR_ERR(icache_dentry); + } + + return 0; +} +module_init(cache_debugfs_init); + +MODULE_LICENSE("GPL v2"); |