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authorBjorn Andersson <bjorn.andersson@linaro.org>2017-08-28 08:34:53 +0300
committerBjorn Andersson <bjorn.andersson@linaro.org>2017-09-02 01:49:13 +0300
commit7c89717f82bd305e3102963485f3da160d11bcf6 (patch)
tree616279dd2fb1c43108e69644439d1e8f2216db6e /drivers/remoteproc
parent4fec0a5a193666279635eeb0257984b7a88ee332 (diff)
downloadlinux-7c89717f82bd305e3102963485f3da160d11bcf6.tar.xz
remoteproc: Introduce rproc handle accessor for children
In certain circumstances rpmsg devices needs to acquire a handle to the ancestor remoteproc instance, e.g. to invoke rproc_report_crash() when a fatal error is detected. Introduce an interface that walks the device tree in search for a remoteproc instance and return this. Tested-by: Suman Anna <s-anna@ti.com> Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Diffstat (limited to 'drivers/remoteproc')
-rw-r--r--drivers/remoteproc/remoteproc_core.c18
1 files changed, 18 insertions, 0 deletions
diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
index 8072df1f0f94..eab14b414bf0 100644
--- a/drivers/remoteproc/remoteproc_core.c
+++ b/drivers/remoteproc/remoteproc_core.c
@@ -1431,6 +1431,7 @@ struct rproc *rproc_alloc(struct device *dev, const char *name,
rproc->dev.parent = dev;
rproc->dev.type = &rproc_type;
rproc->dev.class = &rproc_class;
+ rproc->dev.driver_data = rproc;
/* Assign a unique device index and name */
rproc->index = ida_simple_get(&rproc_dev_index, 0, 0, GFP_KERNEL);
@@ -1570,6 +1571,23 @@ void rproc_remove_subdev(struct rproc *rproc, struct rproc_subdev *subdev)
EXPORT_SYMBOL(rproc_remove_subdev);
/**
+ * rproc_get_by_child() - acquire rproc handle of @dev's ancestor
+ * @dev: child device to find ancestor of
+ *
+ * Returns the ancestor rproc instance, or NULL if not found.
+ */
+struct rproc *rproc_get_by_child(struct device *dev)
+{
+ for (dev = dev->parent; dev; dev = dev->parent) {
+ if (dev->type == &rproc_type)
+ return dev->driver_data;
+ }
+
+ return NULL;
+}
+EXPORT_SYMBOL(rproc_get_by_child);
+
+/**
* rproc_report_crash() - rproc crash reporter function
* @rproc: remote processor
* @type: crash type