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authorCristian Marussi <cristian.marussi@arm.com>2020-07-01 18:53:41 +0300
committerSudeep Holla <sudeep.holla@arm.com>2020-07-01 19:07:25 +0300
commite7c215f358a350c4bc326b9cea86763f480a97f9 (patch)
tree9213c564ac72684b6ae12dc7ca1f9e47d242521b /include/linux/scmi_protocol.h
parent1fc2dd1864c2b18860fb619caeee758504c3aac8 (diff)
downloadlinux-e7c215f358a350c4bc326b9cea86763f480a97f9.tar.xz
firmware: arm_scmi: Add notification callbacks-registration
Add the core SCMI notifications callbacks-registration support: allow users to register their own callbacks against the desired events. Whenever a registration request is issued against a still non existent event, mark such request as pending for later processing, in order to account for possible late initializations of SCMI Protocols associated to loadable drivers. Link: https://lore.kernel.org/r/20200701155348.52864-3-cristian.marussi@arm.com Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Signed-off-by: Cristian Marussi <cristian.marussi@arm.com> Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
Diffstat (limited to 'include/linux/scmi_protocol.h')
-rw-r--r--include/linux/scmi_protocol.h46
1 files changed, 46 insertions, 0 deletions
diff --git a/include/linux/scmi_protocol.h b/include/linux/scmi_protocol.h
index 9a34b02a9cce..26957d6872a5 100644
--- a/include/linux/scmi_protocol.h
+++ b/include/linux/scmi_protocol.h
@@ -9,6 +9,7 @@
#define _LINUX_SCMI_PROTOCOL_H
#include <linux/device.h>
+#include <linux/notifier.h>
#include <linux/types.h>
#define SCMI_MAX_STR_SIZE 16
@@ -214,6 +215,49 @@ struct scmi_reset_ops {
};
/**
+ * struct scmi_notify_ops - represents notifications' operations provided by
+ * SCMI core
+ * @register_event_notifier: Register a notifier_block for the requested event
+ * @unregister_event_notifier: Unregister a notifier_block for the requested
+ * event
+ *
+ * A user can register/unregister its own notifier_block against the wanted
+ * platform instance regarding the desired event identified by the
+ * tuple: (proto_id, evt_id, src_id) using the provided register/unregister
+ * interface where:
+ *
+ * @handle: The handle identifying the platform instance to use
+ * @proto_id: The protocol ID as in SCMI Specification
+ * @evt_id: The message ID of the desired event as in SCMI Specification
+ * @src_id: A pointer to the desired source ID if different sources are
+ * possible for the protocol (like domain_id, sensor_id...etc)
+ *
+ * @src_id can be provided as NULL if it simply does NOT make sense for
+ * the protocol at hand, OR if the user is explicitly interested in
+ * receiving notifications from ANY existent source associated to the
+ * specified proto_id / evt_id.
+ *
+ * Received notifications are finally delivered to the registered users,
+ * invoking the callback provided with the notifier_block *nb as follows:
+ *
+ * int user_cb(nb, evt_id, report)
+ *
+ * with:
+ *
+ * @nb: The notifier block provided by the user
+ * @evt_id: The message ID of the delivered event
+ * @report: A custom struct describing the specific event delivered
+ */
+struct scmi_notify_ops {
+ int (*register_event_notifier)(const struct scmi_handle *handle,
+ u8 proto_id, u8 evt_id, u32 *src_id,
+ struct notifier_block *nb);
+ int (*unregister_event_notifier)(const struct scmi_handle *handle,
+ u8 proto_id, u8 evt_id, u32 *src_id,
+ struct notifier_block *nb);
+};
+
+/**
* struct scmi_handle - Handle returned to ARM SCMI clients for usage.
*
* @dev: pointer to the SCMI device
@@ -223,6 +267,7 @@ struct scmi_reset_ops {
* @clk_ops: pointer to set of clock protocol operations
* @sensor_ops: pointer to set of sensor protocol operations
* @reset_ops: pointer to set of reset protocol operations
+ * @notify_ops: pointer to set of notifications related operations
* @perf_priv: pointer to private data structure specific to performance
* protocol(for internal use only)
* @clk_priv: pointer to private data structure specific to clock
@@ -244,6 +289,7 @@ struct scmi_handle {
struct scmi_power_ops *power_ops;
struct scmi_sensor_ops *sensor_ops;
struct scmi_reset_ops *reset_ops;
+ struct scmi_notify_ops *notify_ops;
/* for protocol internal use */
void *perf_priv;
void *clk_priv;