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

Stanimir Varbanov
2020-06-09T10:48:53Z

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@linaro.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