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authorYunhong Jiang <yunhong.jiang@intel.com>2015-08-04 12:17:53 -0700
committerYunhong Jiang <yunhong.jiang@intel.com>2015-08-04 15:44:42 -0700
commit9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (patch)
tree1c9cafbcd35f783a87880a10f85d1a060db1a563 /kernel/arch/sh/mm/asids-debugfs.c
parent98260f3884f4a202f9ca5eabed40b1354c489b29 (diff)
Add the rt linux 4.1.3-rt3 as base
Import the rt linux 4.1.3-rt3 as OPNFV kvm base. It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and the base is: commit 0917f823c59692d751951bf5ea699a2d1e2f26a2 Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Date: Sat Jul 25 12:13:34 2015 +0200 Prepare v4.1.3-rt3 Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> We lose all the git history this way and it's not good. We should apply another opnfv project repo in future. Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423 Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Diffstat (limited to 'kernel/arch/sh/mm/asids-debugfs.c')
-rw-r--r--kernel/arch/sh/mm/asids-debugfs.c75
1 files changed, 75 insertions, 0 deletions
diff --git a/kernel/arch/sh/mm/asids-debugfs.c b/kernel/arch/sh/mm/asids-debugfs.c
new file mode 100644
index 000000000..ecfc6b0c1
--- /dev/null
+++ b/kernel/arch/sh/mm/asids-debugfs.c
@@ -0,0 +1,75 @@
+/*
+ * 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 : %04lx\n", pid,
+ cpu_asid(smp_processor_id(), p->mm));
+ }
+
+ 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, arch_debugfs_dir,
+ NULL, &asids_debugfs_fops);
+ if (!asids_dentry)
+ return -ENOMEM;
+
+ return PTR_ERR_OR_ZERO(asids_dentry);
+}
+module_init(asids_debugfs_init);
+
+MODULE_LICENSE("GPL v2");