/*
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* debugfs ops for process ASIDs
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*
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* Copyright (C) 2000, 2001 Paolo Alberelli
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* Copyright (C) 2003 - 2008 Paul Mundt
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* Copyright (C) 2003, 2004 Richard Curnow
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*
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* Provides a debugfs file that lists out the ASIDs currently associated
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* with the processes.
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*
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* In the SH-5 case, if the DM.PC register is examined through the debug
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* link, this shows ASID + PC. To make use of this, the PID->ASID
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* relationship needs to be known. This is primarily for debugging.
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*
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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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#include <linux/init.h>
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#include <linux/debugfs.h>
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#include <linux/seq_file.h>
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#include <linux/spinlock.h>
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#include <linux/sched/signal.h>
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#include <linux/sched/task.h>
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#include <asm/processor.h>
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#include <asm/mmu_context.h>
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static int asids_seq_show(struct seq_file *file, void *iter)
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{
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struct task_struct *p;
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read_lock(&tasklist_lock);
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for_each_process(p) {
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int pid = p->pid;
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if (unlikely(!pid))
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continue;
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if (p->mm)
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seq_printf(file, "%5d : %04lx\n", pid,
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cpu_asid(smp_processor_id(), p->mm));
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}
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read_unlock(&tasklist_lock);
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return 0;
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}
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static int asids_debugfs_open(struct inode *inode, struct file *file)
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{
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return single_open(file, asids_seq_show, inode->i_private);
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}
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static const struct file_operations asids_debugfs_fops = {
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.owner = THIS_MODULE,
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.open = asids_debugfs_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release,
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};
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static int __init asids_debugfs_init(void)
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{
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debugfs_create_file("asids", S_IRUSR, arch_debugfs_dir, NULL,
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&asids_debugfs_fops);
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return 0;
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}
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device_initcall(asids_debugfs_init);
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