qca-wifi: Add QAL API for Linux notifier registration

Add QAL API to register/unregister to the Linux
kernel panic notifier chain.

Change-Id: Ie45ca7eea3efd80c62a7de066e2cf184f1606cb0
CRs-Fixed: 2408487

qal/inc/qal_notifier.h

@@ -0,0 +1,50 @@
+/*
+ * Copyright (c) 2019 The Linux Foundation. All rights reserved.
+ *
+ * Permission to use, copy, modify, and/or distribute this software for
+ * any purpose with or without fee is hereby granted, provided that the
+ * above copyright notice and this permission notice appear in all
+ * copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
+ * WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE
+ * AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
+ * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
+ * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
+ * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+ * PERFORMANCE OF THIS SOFTWARE.
+ */
+
+/**
+ * DOC: qal_notifier (QAL notifier)
+ * QCA driver framework for OS notifier handlers
+ */
+
+#ifndef __QAL_NOTIFIER_H
+#define __QAL_NOTIFIER_H
+
+#include "qdf_types.h"
+
+typedef QDF_STATUS (*qal_panic_notifier)(void *data);
+
+/**
+ *
+ * qal_register_panic_notifier() - register to panic notifier chain
+ *
+ * To be called once, globally.
+ *
+ * Return: None
+ */
+QDF_STATUS qal_register_panic_notifier(qal_panic_notifier cb);
+
+/**
+ * qal_unregister_panic_notifier() - unregister linux panic notifier chain
+ *
+ * To be called once, globally.
+ *
+ * Return: None
+ */
+QDF_STATUS qal_unregister_panic_notifier(void);
+
+#endif /* __QAL_NOTIFIER_H */

qal/linux/src/qal_notifier.c

@@ -0,0 +1,61 @@
+/*
+ * Copyright (c) 2019 The Linux Foundation. All rights reserved.
+ *
+ * Permission to use, copy, modify, and/or distribute this software for
+ * any purpose with or without fee is hereby granted, provided that the
+ * above copyright notice and this permission notice appear in all
+ * copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
+ * WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE
+ * AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
+ * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
+ * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
+ * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+ * PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include "qal_notifier.h"
+#include "qdf_module.h"
+#include "qdf_trace.h"
+
+static struct notifier_block qal_panic_nb;
+
+static qal_panic_notifier qal_panic_cb;
+
+static int qal_panic_notifier_handler(struct notifier_block *nb,
+				      unsigned long action, void *data)
+{
+	qal_panic_cb(data);
+	return QDF_STATUS_SUCCESS;
+}
+
+QDF_STATUS qal_register_panic_notifier(qal_panic_notifier cb)
+{
+	QDF_ASSERT(!qal_panic_cb);
+	if (qal_panic_cb) {
+		qdf_err("Panic notifier already registered");
+		return QDF_STATUS_E_FAILURE;
+	}
+
+	qal_panic_cb = cb;
+
+	qal_panic_nb.notifier_call = qal_panic_notifier_handler;
+	atomic_notifier_chain_register(&panic_notifier_list,
+				       &qal_panic_nb);
+
+	return QDF_STATUS_SUCCESS;
+}
+
+qdf_export_symbol(qal_register_panic_notifier);
+
+QDF_STATUS qal_unregister_panic_notifier(void)
+{
+	atomic_notifier_chain_unregister(&panic_notifier_list,
+					 &qal_panic_nb);
+
+	return QDF_STATUS_SUCCESS;
+}
+
+qdf_export_symbol(qal_unregister_panic_notifier);