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From:   Gokul krishna Krishnakumar <quic_gokukris@quicinc.com>
To:     Andy Gross <agross@kernel.org>,
        Bjorn Andersson <andersson@kernel.org>,
        Konrad Dybcio <konrad.dybcio@somainline.org>,
        Mathieu Poirier <mathieu.poirier@linaro.org>
CC:     <linux-arm-msm@vger.kernel.org>,
        <linux-remoteproc@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
        Trilok Soni <quic_tsoni@quicinc.com>,
        "Satya Durga Srinivasu Prabhala" <quic_satyap@quicinc.com>,
        Rajendra Nayak <quic_rjendra@quicinc.com>,
        Elliot Berman <quic_eberman@quicinc.com>,
        "Guru Das Srinagesh" <quic_gurus@quicinc.com>,
        Gokul krishna Krishnakumar <quic_gokukris@quicinc.com>
Subject: [PATCH v1 1/1] remoteproc: qcom: Add sysfs entry to detect device shutdown
Date:   Mon, 19 Sep 2022 09:48:01 -0700
Message-ID: <42d3ab9227ac3d299abcedbbdd68c86e1dd6acce.1663604826.git.quic_gokukris@quicinc.com>
MIME-Version: 1.0
Content-Type: text/plain
Precedence: bulk

This change adds a sysfs entry which indicates whether the device is being
shutdown to the qcom remoteproc drivers. This is going to be used in the
following patches.

Signed-off-by: Gokul krishna Krishnakumar <quic_gokukris@quicinc.com>
---
 drivers/remoteproc/qcom_common.c | 58 ++++++++++++++++++++++++++++++++++++++++
 drivers/remoteproc/qcom_common.h |  1 +
 2 files changed, 59 insertions(+)

diff --git a/drivers/remoteproc/qcom_common.c b/drivers/remoteproc/qcom_common.c
index 020349f..7959e96 100644
--- a/drivers/remoteproc/qcom_common.c
+++ b/drivers/remoteproc/qcom_common.c
@@ -87,9 +87,32 @@ struct qcom_ssr_subsystem {
 	struct list_head list;
 };
 
+static struct kobject *sysfs_kobject;
+bool qcom_device_shutdown_in_progress;
+EXPORT_SYMBOL(qcom_device_shutdown_in_progress);
+
 static LIST_HEAD(qcom_ssr_subsystem_list);
 static DEFINE_MUTEX(qcom_ssr_subsys_lock);
 
+static const char * const ssr_timeout_msg = "srcu notifier chain for %s:%s taking too long";
+
+static ssize_t qcom_rproc_shutdown_request_store(struct kobject *kobj, struct kobj_attribute *attr,
+						 const char *buf, size_t count)
+{
+	bool val;
+	int ret;
+
+	ret = kstrtobool(buf, &val);
+	if (ret)
+		return ret;
+
+	qcom_device_shutdown_in_progress = val;
+	pr_info("qcom rproc: Device shutdown requested: %s\n", val ? "true" : "false");
+	return count;
+}
+static struct kobj_attribute shutdown_requested_attr = __ATTR(shutdown_in_progress, 0220, NULL,
+							  qcom_rproc_shutdown_request_store);
+
 static void qcom_minidump_cleanup(struct rproc *rproc)
 {
 	struct rproc_dump_segment *entry, *tmp;
@@ -505,5 +528,40 @@ void qcom_remove_ssr_subdev(struct rproc *rproc, struct qcom_rproc_ssr *ssr)
 }
 EXPORT_SYMBOL_GPL(qcom_remove_ssr_subdev);
 
+static int __init qcom_common_init(void)
+{
+	int ret = 0;
+
+	qcom_device_shutdown_in_progress = false;
+
+	sysfs_kobject = kobject_create_and_add("qcom_rproc", kernel_kobj);
+	if (!sysfs_kobject) {
+		pr_err("qcom rproc: failed to create sysfs kobject\n");
+		return -EINVAL;
+	}
+
+	ret = sysfs_create_file(sysfs_kobject, &shutdown_requested_attr.attr);
+	if (ret) {
+		pr_err("qcom rproc: failed to create sysfs file\n");
+		goto remove_kobject;
+	}
+
+	return 0;
+
+	sysfs_remove_file(sysfs_kobject, &shutdown_requested_attr.attr);
+remove_kobject:
+	kobject_put(sysfs_kobject);
+	return ret;
+
+}
+module_init(qcom_common_init);
+
+static void __exit qcom_common_exit(void)
+{
+	sysfs_remove_file(sysfs_kobject, &shutdown_requested_attr.attr);
+	kobject_put(sysfs_kobject);
+}
+module_exit(qcom_common_exit);
+
 MODULE_DESCRIPTION("Qualcomm Remoteproc helper driver");
 MODULE_LICENSE("GPL v2");
diff --git a/drivers/remoteproc/qcom_common.h b/drivers/remoteproc/qcom_common.h
index c35adf7..90b79ce 100644
--- a/drivers/remoteproc/qcom_common.h
+++ b/drivers/remoteproc/qcom_common.h
@@ -34,6 +34,7 @@ struct qcom_rproc_ssr {
 };
 
 void qcom_minidump(struct rproc *rproc, unsigned int minidump_id);
+extern bool qcom_device_shutdown_in_progress;
 
 void qcom_add_glink_subdev(struct rproc *rproc, struct qcom_rproc_glink *glink,
 			   const char *ssr_name);
-- 
2.7.4