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arch/sh/mm/asids-debugfs.c
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/* * 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) |
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seq_printf(file, "%5d : %04lx ", pid, |
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cpu_asid(smp_processor_id(), p->mm)); |
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} 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; |
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asids_dentry = debugfs_create_file("asids", S_IRUSR, arch_debugfs_dir, |
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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"); |