[PATCH 6/6] remoteproc: qcom: Add notification types to SSR

Siddharth Gupta
2020-02-20T02:58:22Z

The SSR subdevice only adds callback for the unprepare event. Add callbacks
for unprepare, start and prepare events. The client driver for a particular
remoteproc might be interested in knowing the status of the remoteproc
while undergoing SSR, not just when the remoteproc has finished shutting
down.

Signed-off-by: Siddharth Gupta <sidgup@codeaurora.org>
---
drivers/remoteproc/qcom_common.c | 39 +++++++++++++++++++++++++++++++++++----
include/linux/remoteproc.h | 15 +++++++++++++++
2 files changed, 50 insertions(+), 4 deletions(-)

diff --git a/drivers/remoteproc/qcom_common.c b/drivers/remoteproc/qcom_common.c
index 6714f27..6f04a5b 100644
--- a/drivers/remoteproc/qcom_common.c
+++ b/drivers/remoteproc/qcom_common.c
@@ -183,9 +183,9 @@ EXPORT_SYMBOL_GPL(qcom_remove_smd_subdev);
*
* Returns pointer to srcu notifier head on success, ERR_PTR on failure.
*
- * This registers the @notify function as handler for restart notifications. As
- * remote processors are stopped this function will be called, with the rproc
- * pointer passed as a parameter.
+ * This registers the @notify function as handler for powerup/shutdown
+ * notifications. This function will be invoked inside the callbacks registered
+ * for the ssr subdevice, with the rproc pointer passed as a parameter.
*/
void *qcom_register_ssr_notifier(struct rproc *rproc, struct notifier_block *nb)
{
@@ -227,11 +227,39 @@ int qcom_unregister_ssr_notifier(void *notify, struct notifier_block *nb)
}
EXPORT_SYMBOL_GPL(qcom_unregister_ssr_notifier);

+static int ssr_notify_prepare(struct rproc_subdev *subdev)
+{
+ struct qcom_rproc_ssr *ssr = to_ssr_subdev(subdev);
+
+ srcu_notifier_call_chain(ssr->rproc_notif_list,
+ RPROC_BEFORE_POWERUP, (void *)ssr->name);
+ return 0;
+}
+
+static int ssr_notify_start(struct rproc_subdev *subdev)
+{
+ struct qcom_rproc_ssr *ssr = to_ssr_subdev(subdev);
+
+ srcu_notifier_call_chain(ssr->rproc_notif_list,
+ RPROC_AFTER_POWERUP, (void *)ssr->name);
+ return 0;
+}
+
+static void ssr_notify_stop(struct rproc_subdev *subdev, bool crashed)
+{
+ struct qcom_rproc_ssr *ssr = to_ssr_subdev(subdev);
+
+ srcu_notifier_call_chain(ssr->rproc_notif_list,
+ RPROC_BEFORE_SHUTDOWN, (void *)ssr->name);
+}
+
+
static void ssr_notify_unprepare(struct rproc_subdev *subdev)
{
struct qcom_rproc_ssr *ssr = to_ssr_subdev(subdev);

- srcu_notifier_call_chain(ssr->rproc_notif_list, 0, (void *)ssr->name);
+ srcu_notifier_call_chain(ssr->rproc_notif_list,
+ RPROC_AFTER_SHUTDOWN, (void *)ssr->name);
}

/**
@@ -248,6 +276,9 @@ void qcom_add_ssr_subdev(struct rproc *rproc, struct qcom_rproc_ssr *ssr,
{
ssr->name = ssr_name;
ssr->subdev.name = kstrdup("ssr_notifs", GFP_KERNEL);
+ ssr->subdev.prepare = ssr_notify_prepare;
+ ssr->subdev.start = ssr_notify_start;
+ ssr->subdev.stop = ssr_notify_stop;
ssr->subdev.unprepare = ssr_notify_unprepare;
ssr->rproc_notif_list = kzalloc(sizeof(struct srcu_notifier_head),
GFP_KERNEL);
diff --git a/include/linux/remoteproc.h b/include/linux/remoteproc.h
index e2f60cc..4be4478 100644
--- a/include/linux/remoteproc.h
+++ b/include/linux/remoteproc.h
@@ -449,6 +449,21 @@ struct rproc_dump_segment {
};

/**
+ * enum rproc_notif_type - Different stages of remoteproc notifications
+ * @RPROC_BEFORE_SHUTDOWN: unprepare stage of remoteproc
+ * @RPROC_AFTER_SHUTDOWN: stop stage of remoteproc
+ * @RPROC_BEFORE_POWERUP: prepare stage of remoteproc
+ * @RPROC_AFTER_POWERUP: start stage of remoteproc
+ */
+enum rproc_notif_type {
+ RPROC_BEFORE_SHUTDOWN,
+ RPROC_AFTER_SHUTDOWN,
+ RPROC_BEFORE_POWERUP,
+ RPROC_AFTER_POWERUP,
+ RPROC_MAX
+};
+
+/**
* struct rproc - represents a physical remote processor device
* @node: list node of this rproc object
* @domain: iommu domain
--
Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project