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/* Copyright (c) 2012, The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#ifndef _LINUX_CORESIGHT_H
#define _LINUX_CORESIGHT_H
#include <linux/device.h>
#include <linux/perf_event.h>
#include <linux/sched.h>
/* Peripheral id registers (0xFD0-0xFEC) */
#define CORESIGHT_PERIPHIDR4 0xfd0
#define CORESIGHT_PERIPHIDR5 0xfd4
#define CORESIGHT_PERIPHIDR6 0xfd8
#define CORESIGHT_PERIPHIDR7 0xfdC
#define CORESIGHT_PERIPHIDR0 0xfe0
#define CORESIGHT_PERIPHIDR1 0xfe4
#define CORESIGHT_PERIPHIDR2 0xfe8
#define CORESIGHT_PERIPHIDR3 0xfeC
/* Component id registers (0xFF0-0xFFC) */
#define CORESIGHT_COMPIDR0 0xff0
#define CORESIGHT_COMPIDR1 0xff4
#define CORESIGHT_COMPIDR2 0xff8
#define CORESIGHT_COMPIDR3 0xffC
#define ETM_ARCH_V3_3 0x23
#define ETM_ARCH_V3_5 0x25
#define PFT_ARCH_V1_0 0x30
#define PFT_ARCH_V1_1 0x31
#define CORESIGHT_UNLOCK 0xc5acce55
extern struct bus_type coresight_bustype;
enum coresight_dev_type {
CORESIGHT_DEV_TYPE_NONE,
CORESIGHT_DEV_TYPE_SINK,
CORESIGHT_DEV_TYPE_LINK,
CORESIGHT_DEV_TYPE_LINKSINK,
CORESIGHT_DEV_TYPE_SOURCE,
};
enum coresight_dev_subtype_sink {
CORESIGHT_DEV_SUBTYPE_SINK_NONE,
CORESIGHT_DEV_SUBTYPE_SINK_PORT,
CORESIGHT_DEV_SUBTYPE_SINK_BUFFER,
};
enum coresight_dev_subtype_link {
CORESIGHT_DEV_SUBTYPE_LINK_NONE,
CORESIGHT_DEV_SUBTYPE_LINK_MERG,
CORESIGHT_DEV_SUBTYPE_LINK_SPLIT,
CORESIGHT_DEV_SUBTYPE_LINK_FIFO,
};
enum coresight_dev_subtype_source {
CORESIGHT_DEV_SUBTYPE_SOURCE_NONE,
CORESIGHT_DEV_SUBTYPE_SOURCE_PROC,
CORESIGHT_DEV_SUBTYPE_SOURCE_BUS,
CORESIGHT_DEV_SUBTYPE_SOURCE_SOFTWARE,
};
/**
* struct coresight_dev_subtype - further characterisation of a type
* @sink_subtype: type of sink this component is, as defined
by @coresight_dev_subtype_sink.
* @link_subtype: type of link this component is, as defined
by @coresight_dev_subtype_link.
* @source_subtype: type of source this component is, as defined
by @coresight_dev_subtype_source.
*/
struct coresight_dev_subtype {
enum coresight_dev_subtype_sink sink_subtype;
enum coresight_dev_subtype_link link_subtype;
enum coresight_dev_subtype_source source_subtype;
};
/**
* struct coresight_platform_data - data harvested from the DT specification
* @cpu: the CPU a source belongs to. Only applicable for ETM/PTMs.
* @name: name of the component as shown under sysfs.
* @nr_inport: number of input ports for this component.
* @outports: list of remote endpoint port number.
* @child_names:name of all child components connected to this device.
* @child_ports:child component port number the current component is
connected to.
* @nr_outport: number of output ports for this component.
* @clk: The clock this component is associated to.
*/
struct coresight_platform_data {
int cpu;
const char *name;
int nr_inport;
int *outports;
const char **child_names;
int *child_ports;
int nr_outport;
struct clk *clk;
};
/**
* struct coresight_desc - description of a component required from drivers
* @type: as defined by @coresight_dev_type.
* @subtype: as defined by @coresight_dev_subtype.
* @ops: generic operations for this component, as defined
by @coresight_ops.
* @pdata: platform data collected from DT.
* @dev: The device entity associated to this component.
* @groups: operations specific to this component. These will end up
in the component's sysfs sub-directory.
*/
struct coresight_desc {
enum coresight_dev_type type;
struct coresight_dev_subtype subtype;
const struct coresight_ops *ops;
struct coresight_platform_data *pdata;
struct device *dev;
const struct attribute_group **groups;
};
/**
* struct coresight_connection - representation of a single connection
* @outport: a connection's output port number.
* @chid_name: remote component's name.
* @child_port: remote component's port number @output is connected to.
* @child_dev: a @coresight_device representation of the component
connected to @outport.
*/
struct coresight_connection {
int outport;
const char *child_name;
int child_port;
struct coresight_device *child_dev;
};
/**
* struct coresight_device - representation of a device as used by the framework
* @conns: array of coresight_connections associated to this component.
* @nr_inport: number of input port associated to this component.
* @nr_outport: number of output port associated to this component.
* @type: as defined by @coresight_dev_type.
* @subtype: as defined by @coresight_dev_subtype.
* @ops: generic operations for this component, as defined
by @coresight_ops.
* @dev: The device entity associated to this component.
* @refcnt: keep track of what is in use.
* @orphan: true if the component has connections that haven't been linked.
* @enable: 'true' if component is currently part of an active path.
* @activated: 'true' only if a _sink_ has been activated. A sink can be
activated but not yet enabled. Enabling for a _sink_
happens when a source has been selected for that it.
*/
struct coresight_device {
struct coresight_connection *conns;
int nr_inport;
int nr_outport;
enum coresight_dev_type type;
struct coresight_dev_subtype subtype;
const struct coresight_ops *ops;
struct device dev;
atomic_t *refcnt;
bool orphan;
bool enable; /* true only if configured as part of a path */
bool activated; /* true only if a sink is part of a path */
};
#define to_coresight_device(d) container_of(d, struct coresight_device, dev)
#define source_ops(csdev) csdev->ops->source_ops
#define sink_ops(csdev) csdev->ops->sink_ops
#define link_ops(csdev) csdev->ops->link_ops
/**
* struct coresight_ops_sink - basic operations for a sink
* Operations available for sinks
* @enable: enables the sink.
* @disable: disables the sink.
* @alloc_buffer: initialises perf's ring buffer for trace collection.
* @free_buffer: release memory allocated in @get_config.
* @set_buffer: initialises buffer mechanic before a trace session.
* @reset_buffer: finalises buffer mechanic after a trace session.
* @update_buffer: update buffer pointers after a trace session.
*/
struct coresight_ops_sink {
int (*enable)(struct coresight_device *csdev, u32 mode);
void (*disable)(struct coresight_device *csdev);
void *(*alloc_buffer)(struct coresight_device *csdev, int cpu,
void **pages, int nr_pages, bool overwrite);
void (*free_buffer)(void *config);
int (*set_buffer)(struct coresight_device *csdev,
struct perf_output_handle *handle,
void *sink_config);
unsigned long (*reset_buffer)(struct coresight_device *csdev,
struct perf_output_handle *handle,
void *sink_config);
void (*update_buffer)(struct coresight_device *csdev,
struct perf_output_handle *handle,
void *sink_config);
};
/**
* struct coresight_ops_link - basic operations for a link
* Operations available for links.
* @enable: enables flow between iport and oport.
* @disable: disables flow between iport and oport.
*/
struct coresight_ops_link {
int (*enable)(struct coresight_device *csdev, int iport, int oport);
void (*disable)(struct coresight_device *csdev, int iport, int oport);
};
/**
* struct coresight_ops_source - basic operations for a source
* Operations available for sources.
* @cpu_id: returns the value of the CPU number this component
* is associated to.
* @trace_id: returns the value of the component's trace ID as known
* to the HW.
* @enable: enables tracing for a source.
* @disable: disables tracing for a source.
*/
struct coresight_ops_source {
int (*cpu_id)(struct coresight_device *csdev);
int (*trace_id)(struct coresight_device *csdev);
int (*enable)(struct coresight_device *csdev,
struct perf_event *event, u32 mode);
void (*disable)(struct coresight_device *csdev,
struct perf_event *event);
};
struct coresight_ops {
const struct coresight_ops_sink *sink_ops;
const struct coresight_ops_link *link_ops;
const struct coresight_ops_source *source_ops;
};
#ifdef CONFIG_CORESIGHT
extern struct coresight_device *
coresight_register(struct coresight_desc *desc);
extern void coresight_unregister(struct coresight_device *csdev);
extern int coresight_enable(struct coresight_device *csdev);
extern void coresight_disable(struct coresight_device *csdev);
extern int coresight_timeout(void __iomem *addr, u32 offset,
int position, int value);
#else
static inline struct coresight_device *
coresight_register(struct coresight_desc *desc) { return NULL; }
static inline void coresight_unregister(struct coresight_device *csdev) {}
static inline int
coresight_enable(struct coresight_device *csdev) { return -ENOSYS; }
static inline void coresight_disable(struct coresight_device *csdev) {}
static inline int coresight_timeout(void __iomem *addr, u32 offset,
int position, int value) { return 1; }
#endif
#ifdef CONFIG_OF
extern int of_coresight_get_cpu(const struct device_node *node);
extern struct coresight_platform_data *
of_get_coresight_platform_data(struct device *dev,
const struct device_node *node);
#else
static inline int of_coresight_get_cpu(const struct device_node *node)
{ return 0; }
static inline struct coresight_platform_data *of_get_coresight_platform_data(
struct device *dev, const struct device_node *node) { return NULL; }
#endif
#ifdef CONFIG_PID_NS
static inline unsigned long
coresight_vpid_to_pid(unsigned long vpid)
{
struct task_struct *task = NULL;
unsigned long pid = 0;
rcu_read_lock();
task = find_task_by_vpid(vpid);
if (task)
pid = task_pid_nr(task);
rcu_read_unlock();
return pid;
}
#else
static inline unsigned long
coresight_vpid_to_pid(unsigned long vpid) { return vpid; }
#endif
#endif
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