Quelle stm.h Sprache: 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,
};

/**
* enum stm_source_type - STM source driver
* @STM_USER: any STM trace source
* @STM_FTRACE: ftrace STM source
*/
enum stm_source_type {
STM_USER,
STM_FTRACE,
};

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 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
* @type: type of STM source driver represented by stm_source_type
* @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;
unsigned int  type;
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_ */

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