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>

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>
Bjorn Andersson
1 parent 4fec0a5a19
Showing 2 changed files with 20 additions and 0 deletions Side-by-side Diff
drivers/remoteproc/remoteproc_core.c
include/linux/remoteproc.h
@@ -1431,6 +1431,7 @@
 	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);
@@ -1568,6 +1569,23 @@
 	list_del(&subdev->node);
 }
 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
@@ -510,6 +510,8 @@
 };
  
 struct rproc *rproc_get_by_phandle(phandle phandle);
+struct rproc *rproc_get_by_child(struct device *dev);
+
 struct rproc *rproc_alloc(struct device *dev, const char *name,
 			  const struct rproc_ops *ops,
 			  const char *firmware, int len);
...	...	@@ -1431,6 +1431,7 @@
1431	1431	rproc->dev.parent = dev;
1432	1432	rproc->dev.type = &rproc_type;
1433	1433	rproc->dev.class = &rproc_class;
	1434	+ rproc->dev.driver_data = rproc;
1434	1435
1435	1436	/* Assign a unique device index and name */
1436	1437	rproc->index = ida_simple_get(&rproc_dev_index, 0, 0, GFP_KERNEL);
...	...	@@ -1568,6 +1569,23 @@
1568	1569	list_del(&subdev->node);
1569	1570	}
1570	1571	EXPORT_SYMBOL(rproc_remove_subdev);
	1572	+
	1573	+/**
	1574	+ * rproc_get_by_child() - acquire rproc handle of @dev's ancestor
	1575	+ * @dev: child device to find ancestor of
	1576	+ *
	1577	+ * Returns the ancestor rproc instance, or NULL if not found.
	1578	+ */
	1579	+struct rproc rproc_get_by_child(struct device dev)
	1580	+{
	1581	+ for (dev = dev->parent; dev; dev = dev->parent) {
	1582	+ if (dev->type == &rproc_type)
	1583	+ return dev->driver_data;
	1584	+ }
	1585	+
	1586	+ return NULL;
	1587	+}
	1588	+EXPORT_SYMBOL(rproc_get_by_child);
1571	1589
1572	1590	/**
1573	1591	* rproc_report_crash() - rproc crash reporter function
...	...	@@ -510,6 +510,8 @@
510	510	};
511	511
512	512	struct rproc *rproc_get_by_phandle(phandle phandle);
	513	+struct rproc rproc_get_by_child(struct device dev);
	514	+
513	515	struct rproc rproc_alloc(struct device dev, const char *name,
514	516	const struct rproc_ops *ops,
515	517	const char *firmware, int len);