[Feature]add MT2731_MP2_MR2_SVN388 baseline version
Change-Id: Ief04314834b31e27effab435d3ca8ba33b499059
diff --git a/src/kernel/linux/v4.14/fs/pstore/ftrace.c b/src/kernel/linux/v4.14/fs/pstore/ftrace.c
new file mode 100644
index 0000000..06aab07
--- /dev/null
+++ b/src/kernel/linux/v4.14/fs/pstore/ftrace.c
@@ -0,0 +1,156 @@
+/*
+ * Copyright 2012 Google, Inc.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/compiler.h>
+#include <linux/irqflags.h>
+#include <linux/percpu.h>
+#include <linux/smp.h>
+#include <linux/atomic.h>
+#include <linux/types.h>
+#include <linux/mutex.h>
+#include <linux/ftrace.h>
+#include <linux/fs.h>
+#include <linux/debugfs.h>
+#include <linux/err.h>
+#include <linux/cache.h>
+#include <asm/barrier.h>
+#include "internal.h"
+
+/* This doesn't need to be atomic: speed is chosen over correctness here. */
+static u64 pstore_ftrace_stamp;
+
+static void notrace pstore_ftrace_call(unsigned long ip,
+ unsigned long parent_ip,
+ struct ftrace_ops *op,
+ struct pt_regs *regs)
+{
+ unsigned long flags;
+ struct pstore_ftrace_record rec = {};
+ struct pstore_record record = {
+ .type = PSTORE_TYPE_FTRACE,
+ .buf = (char *)&rec,
+ .size = sizeof(rec),
+ .psi = psinfo,
+ };
+
+ if (unlikely(oops_in_progress))
+ return;
+
+ local_irq_save(flags);
+
+ rec.ip = ip;
+ rec.parent_ip = parent_ip;
+ pstore_ftrace_write_timestamp(&rec, pstore_ftrace_stamp++);
+ pstore_ftrace_encode_cpu(&rec, raw_smp_processor_id());
+ psinfo->write(&record);
+
+ local_irq_restore(flags);
+}
+
+static struct ftrace_ops pstore_ftrace_ops __read_mostly = {
+ .func = pstore_ftrace_call,
+};
+
+static DEFINE_MUTEX(pstore_ftrace_lock);
+static bool pstore_ftrace_enabled;
+
+static ssize_t pstore_ftrace_knob_write(struct file *f, const char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ u8 on;
+ ssize_t ret;
+
+ ret = kstrtou8_from_user(buf, count, 2, &on);
+ if (ret)
+ return ret;
+
+ mutex_lock(&pstore_ftrace_lock);
+
+ if (!on ^ pstore_ftrace_enabled)
+ goto out;
+
+ if (on) {
+ ftrace_ops_set_global_filter(&pstore_ftrace_ops);
+ ret = register_ftrace_function(&pstore_ftrace_ops);
+ } else {
+ ret = unregister_ftrace_function(&pstore_ftrace_ops);
+ }
+
+ if (ret) {
+ pr_err("%s: unable to %sregister ftrace ops: %zd\n",
+ __func__, on ? "" : "un", ret);
+ goto err;
+ }
+
+ pstore_ftrace_enabled = on;
+out:
+ ret = count;
+err:
+ mutex_unlock(&pstore_ftrace_lock);
+
+ return ret;
+}
+
+static ssize_t pstore_ftrace_knob_read(struct file *f, char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ char val[] = { '0' + pstore_ftrace_enabled, '\n' };
+
+ return simple_read_from_buffer(buf, count, ppos, val, sizeof(val));
+}
+
+static const struct file_operations pstore_knob_fops = {
+ .open = simple_open,
+ .read = pstore_ftrace_knob_read,
+ .write = pstore_ftrace_knob_write,
+};
+
+static struct dentry *pstore_ftrace_dir;
+
+void pstore_register_ftrace(void)
+{
+ struct dentry *file;
+
+ if (!psinfo->write)
+ return;
+
+ pstore_ftrace_dir = debugfs_create_dir("pstore", NULL);
+ if (!pstore_ftrace_dir) {
+ pr_err("%s: unable to create pstore directory\n", __func__);
+ return;
+ }
+
+ file = debugfs_create_file("record_ftrace", 0600, pstore_ftrace_dir,
+ NULL, &pstore_knob_fops);
+ if (!file) {
+ pr_err("%s: unable to create record_ftrace file\n", __func__);
+ goto err_file;
+ }
+
+ return;
+err_file:
+ debugfs_remove(pstore_ftrace_dir);
+}
+
+void pstore_unregister_ftrace(void)
+{
+ mutex_lock(&pstore_ftrace_lock);
+ if (pstore_ftrace_enabled) {
+ unregister_ftrace_function(&pstore_ftrace_ops);
+ pstore_ftrace_enabled = 0;
+ }
+ mutex_unlock(&pstore_ftrace_lock);
+
+ debugfs_remove_recursive(pstore_ftrace_dir);
+}