[PATCH 11/13] remoteproc: Properly deal with detach request

Mathieu Poirier
2020-08-26T16:47:53Z

This patch introduces the capability to detach a remote processor
that has been attached to or booted by the remoteproc core. For
that to happen a rproc::ops::detach() operation need to be
available.

Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
---
drivers/remoteproc/remoteproc_cdev.c | 6 ++++++
drivers/remoteproc/remoteproc_sysfs.c | 6 ++++++
2 files changed, 12 insertions(+)

diff --git a/drivers/remoteproc/remoteproc_cdev.c b/drivers/remoteproc/remoteproc_cdev.c
index d06f8d4919c7..3a3830e27050 100644
--- a/drivers/remoteproc/remoteproc_cdev.c
+++ b/drivers/remoteproc/remoteproc_cdev.c
@@ -42,6 +42,12 @@ static ssize_t rproc_cdev_write(struct file *filp, const char __user *buf, size_
return -EINVAL;

ret = rproc_shutdown(rproc);
+ } else if (!strncmp(cmd, "detach", len)) {
+ if (rproc->state != RPROC_RUNNING &&
+ rproc->state != RPROC_ATTACHED)
+ return -EINVAL;
+
+ ret = rproc_detach(rproc);
} else {
dev_err(&rproc->dev, "Unrecognized option\n");
ret = -EINVAL;
diff --git a/drivers/remoteproc/remoteproc_sysfs.c b/drivers/remoteproc/remoteproc_sysfs.c
index 6134d2f083ce..013231f69837 100644
--- a/drivers/remoteproc/remoteproc_sysfs.c
+++ b/drivers/remoteproc/remoteproc_sysfs.c
@@ -118,6 +118,12 @@ static ssize_t state_store(struct device *dev,
return -EINVAL;

ret = rproc_shutdown(rproc);
+ } else if (sysfs_streq(buf, "detach")) {
+ if (rproc->state != RPROC_RUNNING &&
+ rproc->state != RPROC_ATTACHED)
+ return -EINVAL;
+
+ ret = rproc_detach(rproc);
} else {
dev_err(&rproc->dev, "Unrecognised option: %s\n", buf);
ret = -EINVAL;
--
2.25.1