Initial commit: OpenHarmony-v4.0-ReleaseOpenHarmony-v4.0-Release

1 files changed, 61 insertions, 0 deletions

diff --git a/arch/mips/mm/sc-debugfs.c b/arch/mips/mm/sc-debugfs.c
new file mode 100644
index 000000000..80ff39471
--- /dev/null
+++ b/arch/mips/mm/sc-debugfs.c
@@ -0,0 +1,61 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2015 Imagination Technologies
+ * Author: Paul Burton <paul.burton@mips.com>
+ */
+
+#include <asm/bcache.h>
+#include <asm/debug.h>
+#include <linux/uaccess.h>
+#include <linux/debugfs.h>
+#include <linux/init.h>
+
+static ssize_t sc_prefetch_read(struct file *file, char __user *user_buf,
+                                size_t count, loff_t *ppos)
+{
+        bool enabled = bc_prefetch_is_enabled();
+        char buf[3];
+
+        buf[0] = enabled ? 'Y' : 'N';
+        buf[1] = '\n';
+        buf[2] = 0;
+
+        return simple_read_from_buffer(user_buf, count, ppos, buf, 2);
+}
+
+static ssize_t sc_prefetch_write(struct file *file,
+                                 const char __user *user_buf,
+                                 size_t count, loff_t *ppos)
+{
+        bool enabled;
+        int err;
+
+        err = kstrtobool_from_user(user_buf, count, &enabled);
+        if (err)
+                return err;
+
+        if (enabled)
+                bc_prefetch_enable();
+        else
+                bc_prefetch_disable();
+
+        return count;
+}
+
+static const struct file_operations sc_prefetch_fops = {
+        .open = simple_open,
+        .llseek = default_llseek,
+        .read = sc_prefetch_read,
+        .write = sc_prefetch_write,
+};
+
+static int __init sc_debugfs_init(void)
+{
+        struct dentry *dir;
+
+        dir = debugfs_create_dir("l2cache", mips_debugfs_dir);
+        debugfs_create_file("prefetch", S_IRUGO | S_IWUSR, dir, NULL,
+                            &sc_prefetch_fops);
+        return 0;
+}
+late_initcall(sc_debugfs_init);