linux-kernel - [PATCH v3 7/7] venus: Add a debugfs file for SSR trigger

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Date:   Tue,  9 Jun 2020 13:46:04 +0300
From:   Stanimir Varbanov <stanimir.varbanov@...aro.org>
To:     linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-media@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-btrfs@...r.kernel.org, linux-acpi@...r.kernel.org,
        netdev@...r.kernel.org
Cc:     Joe Perches <joe@...ches.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jason Baron <jbaron@...mai.com>,
        Stanimir Varbanov <stanimir.varbanov@...aro.org>
Subject: [PATCH v3 7/7] venus: Add a debugfs file for SSR trigger

The SSR (SubSystem Restart) is used to simulate an error on FW
side of Venus. We support following type of triggers - fatal error,
div by zero and watchdog IRQ.

Signed-off-by: Stanimir Varbanov <stanimir.varbanov@...aro.org>
---
 drivers/media/platform/qcom/venus/dbgfs.c | 31 +++++++++++++++++++++++
 1 file changed, 31 insertions(+)

diff --git a/drivers/media/platform/qcom/venus/dbgfs.c b/drivers/media/platform/qcom/venus/dbgfs.c
index a2465fe8e20b..59d52e5af64a 100644
--- a/drivers/media/platform/qcom/venus/dbgfs.c
+++ b/drivers/media/platform/qcom/venus/dbgfs.c
@@ -9,6 +9,35 @@
 
 extern int venus_fw_debug;
 
+static int trigger_ssr_open(struct inode *inode, struct file *file)
+{
+	file->private_data = inode->i_private;
+	return 0;
+}
+
+static ssize_t trigger_ssr_write(struct file *filp, const char __user *buf,
+				 size_t count, loff_t *ppos)
+{
+	struct venus_core *core = filp->private_data;
+	u32 ssr_type;
+	int ret;
+
+	ret = kstrtou32_from_user(buf, count, 4, &ssr_type);
+	if (ret)
+		return ret;
+
+	ret = hfi_core_trigger_ssr(core, ssr_type);
+	if (ret < 0)
+		return ret;
+
+	return count;
+}
+
+static const struct file_operations ssr_fops = {
+	.open = trigger_ssr_open,
+	.write = trigger_ssr_write,
+};
+
 int venus_dbgfs_init(struct venus_core *core)
 {
 	core->root = debugfs_create_dir("venus", NULL);
@@ -17,6 +46,8 @@ int venus_dbgfs_init(struct venus_core *core)
 
 	debugfs_create_x32("fw_level", 0644, core->root, &venus_fw_debug);
 
+	debugfs_create_file("trigger_ssr", 0200, core->root, core, &ssr_fops);
+
 	return 0;
 }
 
-- 
2.17.1