132 lines
4.3 KiB
C
132 lines
4.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* System Trace Module (STM) infrastructure apis
|
|
* Copyright (C) 2014 Intel Corporation.
|
|
*/
|
|
|
|
#ifndef _STM_H_
|
|
#define _STM_H_
|
|
|
|
#include <linux/device.h>
|
|
|
|
/**
|
|
* enum stp_packet_type - STP packets that an STM driver sends
|
|
*/
|
|
enum stp_packet_type {
|
|
STP_PACKET_DATA = 0,
|
|
STP_PACKET_FLAG,
|
|
STP_PACKET_USER,
|
|
STP_PACKET_MERR,
|
|
STP_PACKET_GERR,
|
|
STP_PACKET_TRIG,
|
|
STP_PACKET_XSYNC,
|
|
};
|
|
|
|
/**
|
|
* enum stp_packet_flags - STP packet modifiers
|
|
*/
|
|
enum stp_packet_flags {
|
|
STP_PACKET_MARKED = 0x1,
|
|
STP_PACKET_TIMESTAMPED = 0x2,
|
|
};
|
|
|
|
struct stp_policy;
|
|
|
|
struct stm_device;
|
|
|
|
/**
|
|
* struct stm_data - STM device description and callbacks
|
|
* @name: device name
|
|
* @stm: internal structure, only used by stm class code
|
|
* @sw_start: first STP master available to software
|
|
* @sw_end: last STP master available to software
|
|
* @sw_nchannels: number of STP channels per master
|
|
* @sw_mmiosz: size of one channel's IO space, for mmap, optional
|
|
* @hw_override: masters in the STP stream will not match the ones
|
|
* assigned by software, but are up to the STM hardware
|
|
* @packet: callback that sends an STP packet
|
|
* @mmio_addr: mmap callback, optional
|
|
* @link: called when a new stm_source gets linked to us, optional
|
|
* @unlink: likewise for unlinking, again optional
|
|
* @set_options: set device-specific options on a channel
|
|
*
|
|
* Fill out this structure before calling stm_register_device() to create
|
|
* an STM device and stm_unregister_device() to destroy it. It will also be
|
|
* passed back to @packet(), @mmio_addr(), @link(), @unlink() and @set_options()
|
|
* callbacks.
|
|
*
|
|
* Normally, an STM device will have a range of masters available to software
|
|
* and the rest being statically assigned to various hardware trace sources.
|
|
* The former is defined by the the range [@sw_start..@sw_end] of the device
|
|
* description. That is, the lowest master that can be allocated to software
|
|
* writers is @sw_start and data from this writer will appear is @sw_start
|
|
* master in the STP stream.
|
|
*
|
|
* The @packet callback should adhere to the following rules:
|
|
* 1) it must return the number of bytes it consumed from the payload;
|
|
* 2) therefore, if it sent a packet that does not have payload (like FLAG),
|
|
* it must return zero;
|
|
* 3) if it does not support the requested packet type/flag combination,
|
|
* it must return -ENOTSUPP.
|
|
*
|
|
* The @unlink callback is called when there are no more active writers so
|
|
* that the master/channel can be quiesced.
|
|
*/
|
|
struct stm_data {
|
|
const char *name;
|
|
struct stm_device *stm;
|
|
unsigned int sw_start;
|
|
unsigned int sw_end;
|
|
unsigned int sw_nchannels;
|
|
unsigned int sw_mmiosz;
|
|
unsigned int hw_override;
|
|
ssize_t (*packet)(struct stm_data *, unsigned int,
|
|
unsigned int, unsigned int,
|
|
unsigned int, unsigned int,
|
|
const unsigned char *);
|
|
phys_addr_t (*mmio_addr)(struct stm_data *, unsigned int,
|
|
unsigned int, unsigned int);
|
|
int (*link)(struct stm_data *, unsigned int,
|
|
unsigned int);
|
|
void (*unlink)(struct stm_data *, unsigned int,
|
|
unsigned int);
|
|
long (*set_options)(struct stm_data *, unsigned int,
|
|
unsigned int, unsigned int,
|
|
unsigned long);
|
|
};
|
|
|
|
int stm_register_device(struct device *parent, struct stm_data *stm_data,
|
|
struct module *owner);
|
|
void stm_unregister_device(struct stm_data *stm_data);
|
|
|
|
struct stm_source_device;
|
|
|
|
/**
|
|
* struct stm_source_data - STM source device description and callbacks
|
|
* @name: device name, will be used for policy lookup
|
|
* @src: internal structure, only used by stm class code
|
|
* @nr_chans: number of channels to allocate
|
|
* @link: called when this source gets linked to an STM device
|
|
* @unlink: called when this source is about to get unlinked from its STM
|
|
*
|
|
* Fill in this structure before calling stm_source_register_device() to
|
|
* register a source device. Also pass it to unregister and write calls.
|
|
*/
|
|
struct stm_source_data {
|
|
const char *name;
|
|
struct stm_source_device *src;
|
|
unsigned int percpu;
|
|
unsigned int nr_chans;
|
|
int (*link)(struct stm_source_data *data);
|
|
void (*unlink)(struct stm_source_data *data);
|
|
};
|
|
|
|
int stm_source_register_device(struct device *parent,
|
|
struct stm_source_data *data);
|
|
void stm_source_unregister_device(struct stm_source_data *data);
|
|
|
|
int notrace stm_source_write(struct stm_source_data *data, unsigned int chan,
|
|
const char *buf, size_t count);
|
|
|
|
#endif /* _STM_H_ */
|