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Event reports are used to convey information describing events to the registered user-callbacks: they are necessarily derived from the underlying raw SCMI events' messages but they are not meant to expose or directly mirror any of those messages data layout, which belong to the protocol layer. Using fixed size types for report fields, mirroring messages structure, is at odd with this: get rid of them using more generic, equivalent, typing. Substitute scmi_event_header fixed size fields with generic types too and shuffle around fields definitions to minimize implicit padding while adapting involved functions. Link: https://lore.kernel.org/r/20200710133919.39792-3-cristian.marussi@arm.com Signed-off-by: Cristian Marussi <cristian.marussi@arm.com> Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
69 lines
2.3 KiB
C
69 lines
2.3 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 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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/**
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* struct scmi_event_ops - Protocol helpers called by the notification core.
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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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int (*set_notify_enabled)(const struct scmi_handle *handle,
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u8 evt_id, u32 src_id, bool enabled);
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void *(*fill_custom_report)(const struct scmi_handle *handle,
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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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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,
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u8 proto_id, size_t queue_sz,
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const struct scmi_event_ops *ops,
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const struct scmi_event *evt, int num_events,
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int num_sources);
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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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