diff options
Diffstat (limited to 'arch/sh/mm')
| -rw-r--r-- | arch/sh/mm/Makefile_32 | 1 | ||||
| -rw-r--r-- | arch/sh/mm/Makefile_64 | 1 | ||||
| -rw-r--r-- | arch/sh/mm/asids-debugfs.c | 79 |
3 files changed, 81 insertions, 0 deletions
diff --git a/arch/sh/mm/Makefile_32 b/arch/sh/mm/Makefile_32 index f066e76da204..cb2f3f299591 100644 --- a/arch/sh/mm/Makefile_32 +++ b/arch/sh/mm/Makefile_32 @@ -18,6 +18,7 @@ mmu-y := tlb-nommu.o pg-nommu.o mmu-$(CONFIG_MMU) := fault_32.o tlbflush_32.o ioremap_32.o obj-y += $(mmu-y) +obj-$(CONFIG_DEBUG_FS) += asids-debugfs.o ifdef CONFIG_DEBUG_FS obj-$(CONFIG_CPU_SH4) += cache-debugfs.o diff --git a/arch/sh/mm/Makefile_64 b/arch/sh/mm/Makefile_64 index 9481d0f54efd..2863ffb7006d 100644 --- a/arch/sh/mm/Makefile_64 +++ b/arch/sh/mm/Makefile_64 @@ -13,6 +13,7 @@ obj-y += cache-sh5.o endif obj-y += $(mmu-y) +obj-$(CONFIG_DEBUG_FS) += asids-debugfs.o obj-$(CONFIG_HUGETLB_PAGE) += hugetlbpage.o obj-$(CONFIG_NUMA) += numa.o diff --git a/arch/sh/mm/asids-debugfs.c b/arch/sh/mm/asids-debugfs.c new file mode 100644 index 000000000000..0678a1044a9a --- /dev/null +++ b/arch/sh/mm/asids-debugfs.c @@ -0,0 +1,79 @@ +/* + * debugfs ops for process ASIDs + * + * Copyright (C) 2000, 2001 Paolo Alberelli + * Copyright (C) 2003 - 2008 Paul Mundt + * Copyright (C) 2003, 2004 Richard Curnow + * + * Provides a debugfs file that lists out the ASIDs currently associated + * with the processes. + * + * In the SH-5 case, if the DM.PC register is examined through the debug + * link, this shows ASID + PC. To make use of this, the PID->ASID + * relationship needs to be known. This is primarily for debugging. + * + * 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 <linux/spinlock.h> +#include <asm/processor.h> +#include <asm/mmu_context.h> + +static int asids_seq_show(struct seq_file *file, void *iter) +{ + struct task_struct *p; + + read_lock(&tasklist_lock); + + for_each_process(p) { + int pid = p->pid; + + if (unlikely(!pid)) + continue; + + if (p->mm) + seq_printf(file, "%5d : %02x\n", pid, + cpu_asid(smp_processor_id(), p->mm)); + else + seq_printf(file, "%5d : (none)\n", pid); + } + + read_unlock(&tasklist_lock); + + return 0; +} + +static int asids_debugfs_open(struct inode *inode, struct file *file) +{ + return single_open(file, asids_seq_show, inode->i_private); +} + +static const struct file_operations asids_debugfs_fops = { + .owner = THIS_MODULE, + .open = asids_debugfs_open, + .read = seq_read, + .llseek = seq_lseek, + .release = single_release, +}; + +static int __init asids_debugfs_init(void) +{ + struct dentry *asids_dentry; + + asids_dentry = debugfs_create_file("asids", S_IRUSR, sh_debugfs_root, + NULL, &asids_debugfs_fops); + if (!asids_dentry) + return -ENOMEM; + if (IS_ERR(asids_dentry)) + return PTR_ERR(asids_dentry); + + return 0; +} +module_init(asids_debugfs_init); + +MODULE_LICENSE("GPL v2"); |