diff mbox series

[v5,11/19] remoteproc: Introduce function __rproc_detach()

Message ID 20210211234627.2669674-12-mathieu.poirier@linaro.org
State Accepted
Commit 6070203fe43335a02b7fd103bae582095411adc5
Headers show
Series remoteproc: Add support for detaching a remote processor | expand

Commit Message

Mathieu Poirier Feb. 11, 2021, 11:46 p.m. UTC 
Introduce function __rproc_detach() to perform the same kind of
operation as rproc_stop(), but instead of switching off the
remote processor using rproc->ops->stop(), it uses
rproc->ops->detach().  That way it is possible for the core
to release the resources associated with a remote processor while
the latter is kept operating.

Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>

Reviewed-by: Peng Fan <peng.fan@nxp.com>

---
New for V5:
- Removed fancy error recovery when ops->detach() fails to replicate what is
  done in rproc->stop().
---
 drivers/remoteproc/remoteproc_core.c | 30 ++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

-- 
2.25.1
diff mbox series

Patch

diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
index 5c52c612a7f0..b150138542d4 100644
--- a/drivers/remoteproc/remoteproc_core.c
+++ b/drivers/remoteproc/remoteproc_core.c
@@ -1709,6 +1709,36 @@  static int rproc_stop(struct rproc *rproc, bool crashed)
 	return 0;
 }
 
+/*
+ * __rproc_detach(): Does the opposite of __rproc_attach()
+ */
+static int __maybe_unused __rproc_detach(struct rproc *rproc)
+{
+	struct device *dev = &rproc->dev;
+	int ret;
+
+	/* No need to continue if a detach() operation has not been provided */
+	if (!rproc->ops->detach)
+		return -EINVAL;
+
+	/* Stop any subdevices for the remote processor */
+	rproc_stop_subdevices(rproc, false);
+
+	/* Tell the remote processor the core isn't available anymore */
+	ret = rproc->ops->detach(rproc);
+	if (ret) {
+		dev_err(dev, "can't detach from rproc: %d\n", ret);
+		return ret;
+	}
+
+	rproc_unprepare_subdevices(rproc);
+
+	rproc->state = RPROC_DETACHED;
+
+	dev_info(dev, "detached remote processor %s\n", rproc->name);
+
+	return 0;
+}
 
 /**
  * rproc_trigger_recovery() - recover a remoteproc