Commit a99d6fde authored by Paul Mundt's avatar Paul Mundt
Browse files

sh: Convert sh64 /proc/asids to debugfs and generic sh.



This converts the sh64 /proc/asids entry to debugfs and enables it for
all SH parts that have debugfs enabled.

On MMU systems this can be used to determine which processes are using
which ASIDs which in turn can be used for finer grained cache tag
analysis.
Signed-off-by: default avatarPaul Mundt <lethal@linux-sh.org>
parent 4d1f3bbe
......@@ -180,10 +180,6 @@ endmenu
if SUPERH64
config SH64_PROC_ASIDS
bool "Debug: report ASIDs through /proc/asids"
depends on PROC_FS && MMU
config SH64_SR_WATCH
bool "Debug: set SR.WATCH to enable hardware watchpoints and trace"
......
......@@ -23,7 +23,6 @@
#include <linux/reboot.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/proc_fs.h>
#include <linux/io.h>
#include <asm/syscalls.h>
#include <asm/uaccess.h>
......@@ -590,41 +589,3 @@ unsigned long get_wchan(struct task_struct *p)
#endif
return pc;
}
/* Provide a /proc/asids file that lists out the
ASIDs currently associated with the processes. (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.)
*/
#if defined(CONFIG_SH64_PROC_ASIDS)
static int
asids_proc_info(char *buf, char **start, off_t fpos, int length, int *eof, void *data)
{
int len=0;
struct task_struct *p;
read_lock(&tasklist_lock);
for_each_process(p) {
int pid = p->pid;
if (!pid)
continue;
if (p->mm)
len += sprintf(buf+len, "%5d : %02lx\n", pid,
asid_cache(smp_processor_id()));
else
len += sprintf(buf+len, "%5d : (none)\n", pid);
}
read_unlock(&tasklist_lock);
*eof = 1;
return len;
}
static int __init register_proc_asids(void)
{
create_proc_read_entry("asids", 0, NULL, asids_proc_info, NULL);
return 0;
}
__initcall(register_proc_asids);
#endif
......@@ -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
......
......@@ -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
......
/*
* 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");
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