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When registering protocol events, use the optional .is_notify_supported callback provided by the protocol to check if that specific notification type is available for that particular resource on the running system, marking it as unsupported otherwise. Then, when a notification enable request is received, return an error if it was previously marked as unsuppported, so avoiding to send a needless notification enable command and check the returned value for failure. Signed-off-by: Cristian Marussi <cristian.marussi@arm.com> Link: https://lore.kernel.org/r/20240212123233.1230090-2-cristian.marussi@arm.com Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
95 lines
3.4 KiB
C
95 lines
3.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* System Control and Management Interface (SCMI) Message Protocol
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* notification header file containing some definitions, structures
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* and function prototypes related to SCMI Notification handling.
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*
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* Copyright (C) 2020-2021 ARM Ltd.
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*/
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#ifndef _SCMI_NOTIFY_H
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#define _SCMI_NOTIFY_H
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#include <linux/device.h>
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#include <linux/ktime.h>
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#include <linux/types.h>
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#define SCMI_PROTO_QUEUE_SZ 4096
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/**
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* struct scmi_event - Describes an event to be supported
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* @id: Event ID
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* @max_payld_sz: Max possible size for the payload of a notification message
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* @max_report_sz: Max possible size for the report of a notification message
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*
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* Each SCMI protocol, during its initialization phase, can describe the events
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* it wishes to support in a few struct scmi_event and pass them to the core
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* using scmi_register_protocol_events().
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*/
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struct scmi_event {
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u8 id;
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size_t max_payld_sz;
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size_t max_report_sz;
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};
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struct scmi_protocol_handle;
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/**
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* struct scmi_event_ops - Protocol helpers called by the notification core.
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* @is_notify_supported: Return 0 if the specified notification for the
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* specified resource (src_id) is supported.
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* @get_num_sources: Returns the number of possible events' sources for this
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* protocol
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* @set_notify_enabled: Enable/disable the required evt_id/src_id notifications
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* using the proper custom protocol commands.
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* Return 0 on Success
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* @fill_custom_report: fills a custom event report from the provided
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* event message payld identifying the event
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* specific src_id.
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* Return NULL on failure otherwise @report now fully
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* populated
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*
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* Context: Helpers described in &struct scmi_event_ops are called only in
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* process context.
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*/
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struct scmi_event_ops {
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bool (*is_notify_supported)(const struct scmi_protocol_handle *ph,
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u8 evt_id, u32 src_id);
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int (*get_num_sources)(const struct scmi_protocol_handle *ph);
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int (*set_notify_enabled)(const struct scmi_protocol_handle *ph,
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u8 evt_id, u32 src_id, bool enabled);
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void *(*fill_custom_report)(const struct scmi_protocol_handle *ph,
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u8 evt_id, ktime_t timestamp,
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const void *payld, size_t payld_sz,
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void *report, u32 *src_id);
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};
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/**
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* struct scmi_protocol_events - Per-protocol description of available events
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* @queue_sz: Size in bytes of the per-protocol queue to use.
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* @ops: Array of protocol-specific events operations.
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* @evts: Array of supported protocol's events.
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* @num_events: Number of supported protocol's events described in @evts.
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* @num_sources: Number of protocol's sources, should be greater than 0; if not
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* available at compile time, it will be provided at run-time via
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* @get_num_sources.
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*/
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struct scmi_protocol_events {
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size_t queue_sz;
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const struct scmi_event_ops *ops;
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const struct scmi_event *evts;
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unsigned int num_events;
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unsigned int num_sources;
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};
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int scmi_notification_init(struct scmi_handle *handle);
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void scmi_notification_exit(struct scmi_handle *handle);
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int scmi_register_protocol_events(const struct scmi_handle *handle, u8 proto_id,
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const struct scmi_protocol_handle *ph,
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const struct scmi_protocol_events *ee);
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void scmi_deregister_protocol_events(const struct scmi_handle *handle,
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u8 proto_id);
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int scmi_notify(const struct scmi_handle *handle, u8 proto_id, u8 evt_id,
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const void *buf, size_t len, ktime_t ts);
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#endif /* _SCMI_NOTIFY_H */
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