From: Khalid Aziz <khalid.aziz@oracle.com>
Date: Wed, 16 Nov 2016 23:43:13 +0000 (-0700)
Subject: sparc64: Add proc files specific to ADI
X-Git-Tag: v4.1.12-92~1^2~3
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=58369ded44b1165808443e79d6992471645afe06;p=users%2Fjedix%2Flinux-maple.git

sparc64: Add proc files specific to ADI

This patch adds /proc/sys/kernel/mcd_on_by_default and
/proc/<pid>/sparc_adi files. These files allow userspace access to
change ADI parameters.

Orabug: 22713162

Signed-off-by: Khalid Aziz <khalid.aziz@oracle.com>
Signed-off-by: Allen Pais <allen.pais@oracle.com>
---

diff --git a/arch/sparc/include/asm/adi_64.h b/arch/sparc/include/asm/adi_64.h
index 24fe52fe9e8fd..cd2ce353de9e9 100644
--- a/arch/sparc/include/asm/adi_64.h
+++ b/arch/sparc/include/asm/adi_64.h
@@ -24,6 +24,8 @@ struct adi_config {
 
 extern struct adi_config adi_state;
 
+extern int mcd_on_by_default;
+
 extern void mdesc_adi_init(void);
 
 static inline bool adi_capable(void)
diff --git a/fs/proc/base.c b/fs/proc/base.c
index 093ca14f57015..5da375d7b3b46 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -1299,6 +1299,47 @@ static const struct file_operations proc_pid_sched_autogroup_operations = {
 
 #endif /* CONFIG_SCHED_AUTOGROUP */
 
+#ifdef CONFIG_SPARC64
+static int
+sparc_adi_show(struct seq_file *m, void *v)
+{
+	struct inode *inode = m->private;
+	struct task_struct *task = get_proc_task(inode);
+
+	if (!task)
+		return -ENOENT;
+
+	if (!adi_capable())
+		return -ENOTSUPP;
+
+	task_lock(task);
+
+	/* anonymous processes can not use ADI */
+	if (task->mm) {
+		struct pt_regs *regs;
+		regs = task_pt_regs(task);
+		seq_printf(m, "%d\n", !!(regs->tstate & TSTATE_MCDE));
+	} else
+		seq_printf(m, "-1\n");
+
+	task_unlock(task);
+	put_task_struct(task);
+	return 0;
+}
+
+static int
+sparc_adi_open(struct inode *inode, struct file *filp)
+{
+	return single_open(filp, sparc_adi_show, inode);
+}
+
+static const struct file_operations proc_sparc_adi_operations = {
+	.open		= sparc_adi_open,
+	.read		= seq_read,
+	.release	= single_release,
+};
+#endif /* CONFIG_SPARC_ADI */
+
 static ssize_t comm_write(struct file *file, const char __user *buf,
 				size_t count, loff_t *offset)
 {
@@ -2640,6 +2681,9 @@ static const struct pid_entry tgid_base_stuff[] = {
 #ifdef CONFIG_CHECKPOINT_RESTORE
 	REG("timers",	  S_IRUGO, proc_timers_operations),
 #endif
+#ifdef CONFIG_SPARC64
+	REG("sparc_adi",  S_IRUGO, proc_sparc_adi_operations),
+#endif
 };
 
 static int proc_tgid_base_readdir(struct file *file, struct dir_context *ctx)
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 2082b1a88fb9a..c2b551fcaac98 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -1132,6 +1132,15 @@ static struct ctl_table kern_table[] = {
 		.extra1		= &zero,
 		.extra2		= &one,
 	},
+#if defined(CONFIG_SPARC64)
+	{
+		.procname	= "mcd_on_by_default",
+		.data		= &mcd_on_by_default,
+		.maxlen		= sizeof(int),
+		.mode		= 0644,
+		.proc_handler	= proc_dointvec,
+	},
+#endif
 	{ }
 };