140 lines
4.7 KiB
C
140 lines
4.7 KiB
C
/*
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* System Trace Module (STM) infrastructure apis
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* Copyright (C) 2014 Intel Corporation.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*/
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#ifndef _STM_H_
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#define _STM_H_
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#include <linux/device.h>
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/**
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* enum stp_packet_type - STP packets that an STM driver sends
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*/
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enum stp_packet_type {
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STP_PACKET_DATA = 0,
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STP_PACKET_FLAG,
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STP_PACKET_USER,
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STP_PACKET_MERR,
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STP_PACKET_GERR,
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STP_PACKET_TRIG,
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STP_PACKET_XSYNC,
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};
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/**
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* enum stp_packet_flags - STP packet modifiers
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*/
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enum stp_packet_flags {
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STP_PACKET_MARKED = 0x1,
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STP_PACKET_TIMESTAMPED = 0x2,
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};
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struct stp_policy;
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struct stm_device;
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/**
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* struct stm_data - STM device description and callbacks
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* @name: device name
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* @stm: internal structure, only used by stm class code
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* @sw_start: first STP master available to software
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* @sw_end: last STP master available to software
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* @sw_nchannels: number of STP channels per master
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* @sw_mmiosz: size of one channel's IO space, for mmap, optional
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* @hw_override: masters in the STP stream will not match the ones
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* assigned by software, but are up to the STM hardware
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* @packet: callback that sends an STP packet
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* @mmio_addr: mmap callback, optional
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* @link: called when a new stm_source gets linked to us, optional
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* @unlink: likewise for unlinking, again optional
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* @set_options: set device-specific options on a channel
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*
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* Fill out this structure before calling stm_register_device() to create
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* an STM device and stm_unregister_device() to destroy it. It will also be
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* passed back to @packet(), @mmio_addr(), @link(), @unlink() and @set_options()
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* callbacks.
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*
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* Normally, an STM device will have a range of masters available to software
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* and the rest being statically assigned to various hardware trace sources.
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* The former is defined by the the range [@sw_start..@sw_end] of the device
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* description. That is, the lowest master that can be allocated to software
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* writers is @sw_start and data from this writer will appear is @sw_start
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* master in the STP stream.
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*
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* The @packet callback should adhere to the following rules:
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* 1) it must return the number of bytes it consumed from the payload;
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* 2) therefore, if it sent a packet that does not have payload (like FLAG),
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* it must return zero;
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* 3) if it does not support the requested packet type/flag combination,
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* it must return -ENOTSUPP.
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*
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* The @unlink callback is called when there are no more active writers so
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* that the master/channel can be quiesced.
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*/
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struct stm_data {
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const char *name;
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struct stm_device *stm;
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unsigned int sw_start;
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unsigned int sw_end;
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unsigned int sw_nchannels;
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unsigned int sw_mmiosz;
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unsigned int hw_override;
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ssize_t (*packet)(struct stm_data *, unsigned int,
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unsigned int, unsigned int,
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unsigned int, unsigned int,
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const unsigned char *);
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phys_addr_t (*mmio_addr)(struct stm_data *, unsigned int,
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unsigned int, unsigned int);
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int (*link)(struct stm_data *, unsigned int,
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unsigned int);
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void (*unlink)(struct stm_data *, unsigned int,
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unsigned int);
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long (*set_options)(struct stm_data *, unsigned int,
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unsigned int, unsigned int,
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unsigned long);
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};
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int stm_register_device(struct device *parent, struct stm_data *stm_data,
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struct module *owner);
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void stm_unregister_device(struct stm_data *stm_data);
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struct stm_source_device;
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/**
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* struct stm_source_data - STM source device description and callbacks
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* @name: device name, will be used for policy lookup
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* @src: internal structure, only used by stm class code
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* @nr_chans: number of channels to allocate
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* @link: called when this source gets linked to an STM device
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* @unlink: called when this source is about to get unlinked from its STM
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*
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* Fill in this structure before calling stm_source_register_device() to
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* register a source device. Also pass it to unregister and write calls.
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*/
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struct stm_source_data {
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const char *name;
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struct stm_source_device *src;
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unsigned int percpu;
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unsigned int nr_chans;
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int (*link)(struct stm_source_data *data);
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void (*unlink)(struct stm_source_data *data);
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};
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int stm_source_register_device(struct device *parent,
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struct stm_source_data *data);
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void stm_source_unregister_device(struct stm_source_data *data);
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int stm_source_write(struct stm_source_data *data, unsigned int chan,
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const char *buf, size_t count);
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#endif /* _STM_H_ */
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