LXR linux/include/linux/coresight.h

   1/* Copyright (c) 2012, The Linux Foundation. All rights reserved.
   2 *
   3 * This program is free software; you can redistribute it and/or modify
   4 * it under the terms of the GNU General Public License version 2 and
   5 * only version 2 as published by the Free Software Foundation.
   6 *
   7 * This program is distributed in the hope that it will be useful,
   8 * but WITHOUT ANY WARRANTY; without even the implied warranty of
   9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  10 * GNU General Public License for more details.
  11 */
  12
  13#ifndef _LINUX_CORESIGHT_H
  14#define _LINUX_CORESIGHT_H
  15
  16#include <linux/device.h>
  17#include <linux/perf_event.h>
  18#include <linux/sched.h>
  19
  20/* Peripheral id registers (0xFD0-0xFEC) */
  21#define CORESIGHT_PERIPHIDR4    0xfd0
  22#define CORESIGHT_PERIPHIDR5    0xfd4
  23#define CORESIGHT_PERIPHIDR6    0xfd8
  24#define CORESIGHT_PERIPHIDR7    0xfdC
  25#define CORESIGHT_PERIPHIDR0    0xfe0
  26#define CORESIGHT_PERIPHIDR1    0xfe4
  27#define CORESIGHT_PERIPHIDR2    0xfe8
  28#define CORESIGHT_PERIPHIDR3    0xfeC
  29/* Component id registers (0xFF0-0xFFC) */
  30#define CORESIGHT_COMPIDR0      0xff0
  31#define CORESIGHT_COMPIDR1      0xff4
  32#define CORESIGHT_COMPIDR2      0xff8
  33#define CORESIGHT_COMPIDR3      0xffC
  34
  35#define ETM_ARCH_V3_3           0x23
  36#define ETM_ARCH_V3_5           0x25
  37#define PFT_ARCH_V1_0           0x30
  38#define PFT_ARCH_V1_1           0x31
  39
  40#define CORESIGHT_UNLOCK        0xc5acce55
  41
  42extern struct bus_type coresight_bustype;
  43
  44enum coresight_dev_type {
  45        CORESIGHT_DEV_TYPE_NONE,
  46        CORESIGHT_DEV_TYPE_SINK,
  47        CORESIGHT_DEV_TYPE_LINK,
  48        CORESIGHT_DEV_TYPE_LINKSINK,
  49        CORESIGHT_DEV_TYPE_SOURCE,
  50};
  51
  52enum coresight_dev_subtype_sink {
  53        CORESIGHT_DEV_SUBTYPE_SINK_NONE,
  54        CORESIGHT_DEV_SUBTYPE_SINK_PORT,
  55        CORESIGHT_DEV_SUBTYPE_SINK_BUFFER,
  56};
  57
  58enum coresight_dev_subtype_link {
  59        CORESIGHT_DEV_SUBTYPE_LINK_NONE,
  60        CORESIGHT_DEV_SUBTYPE_LINK_MERG,
  61        CORESIGHT_DEV_SUBTYPE_LINK_SPLIT,
  62        CORESIGHT_DEV_SUBTYPE_LINK_FIFO,
  63};
  64
  65enum coresight_dev_subtype_source {
  66        CORESIGHT_DEV_SUBTYPE_SOURCE_NONE,
  67        CORESIGHT_DEV_SUBTYPE_SOURCE_PROC,
  68        CORESIGHT_DEV_SUBTYPE_SOURCE_BUS,
  69        CORESIGHT_DEV_SUBTYPE_SOURCE_SOFTWARE,
  70};
  71
  72/**
  73 * struct coresight_dev_subtype - further characterisation of a type
  74 * @sink_subtype:       type of sink this component is, as defined
  75                        by @coresight_dev_subtype_sink.
  76 * @link_subtype:       type of link this component is, as defined
  77                        by @coresight_dev_subtype_link.
  78 * @source_subtype:     type of source this component is, as defined
  79                        by @coresight_dev_subtype_source.
  80 */
  81struct coresight_dev_subtype {
  82        enum coresight_dev_subtype_sink sink_subtype;
  83        enum coresight_dev_subtype_link link_subtype;
  84        enum coresight_dev_subtype_source source_subtype;
  85};
  86
  87/**
  88 * struct coresight_platform_data - data harvested from the DT specification
  89 * @cpu:        the CPU a source belongs to. Only applicable for ETM/PTMs.
  90 * @name:       name of the component as shown under sysfs.
  91 * @nr_inport:  number of input ports for this component.
  92 * @outports:   list of remote endpoint port number.
  93 * @child_names:name of all child components connected to this device.
  94 * @child_ports:child component port number the current component is
  95                connected  to.
  96 * @nr_outport: number of output ports for this component.
  97 * @clk:        The clock this component is associated to.
  98 */
  99struct coresight_platform_data {
 100        int cpu;
 101        const char *name;
 102        int nr_inport;
 103        int *outports;
 104        const char **child_names;
 105        int *child_ports;
 106        int nr_outport;
 107        struct clk *clk;
 108};
 109
 110/**
 111 * struct coresight_desc - description of a component required from drivers
 112 * @type:       as defined by @coresight_dev_type.
 113 * @subtype:    as defined by @coresight_dev_subtype.
 114 * @ops:        generic operations for this component, as defined
 115                by @coresight_ops.
 116 * @pdata:      platform data collected from DT.
 117 * @dev:        The device entity associated to this component.
 118 * @groups:     operations specific to this component. These will end up
 119                in the component's sysfs sub-directory.
 120 */
 121struct coresight_desc {
 122        enum coresight_dev_type type;
 123        struct coresight_dev_subtype subtype;
 124        const struct coresight_ops *ops;
 125        struct coresight_platform_data *pdata;
 126        struct device *dev;
 127        const struct attribute_group **groups;
 128};
 129
 130/**
 131 * struct coresight_connection - representation of a single connection
 132 * @outport:    a connection's output port number.
 133 * @chid_name:  remote component's name.
 134 * @child_port: remote component's port number @output is connected to.
 135 * @child_dev:  a @coresight_device representation of the component
 136                connected to @outport.
 137 */
 138struct coresight_connection {
 139        int outport;
 140        const char *child_name;
 141        int child_port;
 142        struct coresight_device *child_dev;
 143};
 144
 145/**
 146 * struct coresight_device - representation of a device as used by the framework
 147 * @conns:      array of coresight_connections associated to this component.
 148 * @nr_inport:  number of input port associated to this component.
 149 * @nr_outport: number of output port associated to this component.
 150 * @type:       as defined by @coresight_dev_type.
 151 * @subtype:    as defined by @coresight_dev_subtype.
 152 * @ops:        generic operations for this component, as defined
 153                by @coresight_ops.
 154 * @dev:        The device entity associated to this component.
 155 * @refcnt:     keep track of what is in use.
 156 * @orphan:     true if the component has connections that haven't been linked.
 157 * @enable:     'true' if component is currently part of an active path.
 158 * @activated:  'true' only if a _sink_ has been activated.  A sink can be
 159                activated but not yet enabled.  Enabling for a _sink_
 160                happens when a source has been selected for that it.
 161 */
 162struct coresight_device {
 163        struct coresight_connection *conns;
 164        int nr_inport;
 165        int nr_outport;
 166        enum coresight_dev_type type;
 167        struct coresight_dev_subtype subtype;
 168        const struct coresight_ops *ops;
 169        struct device dev;
 170        atomic_t *refcnt;
 171        bool orphan;
 172        bool enable;    /* true only if configured as part of a path */
 173        bool activated; /* true only if a sink is part of a path */
 174};
 175
 176#define to_coresight_device(d) container_of(d, struct coresight_device, dev)
 177
 178#define source_ops(csdev)       csdev->ops->source_ops
 179#define sink_ops(csdev)         csdev->ops->sink_ops
 180#define link_ops(csdev)         csdev->ops->link_ops
 181
 182/**
 183 * struct coresight_ops_sink - basic operations for a sink
 184 * Operations available for sinks
 185 * @enable:             enables the sink.
 186 * @disable:            disables the sink.
 187 * @alloc_buffer:       initialises perf's ring buffer for trace collection.
 188 * @free_buffer:        release memory allocated in @get_config.
 189 * @set_buffer:         initialises buffer mechanic before a trace session.
 190 * @reset_buffer:       finalises buffer mechanic after a trace session.
 191 * @update_buffer:      update buffer pointers after a trace session.
 192 */
 193struct coresight_ops_sink {
 194        int (*enable)(struct coresight_device *csdev, u32 mode);
 195        void (*disable)(struct coresight_device *csdev);
 196        void *(*alloc_buffer)(struct coresight_device *csdev, int cpu,
 197                              void **pages, int nr_pages, bool overwrite);
 198        void (*free_buffer)(void *config);
 199        int (*set_buffer)(struct coresight_device *csdev,
 200                          struct perf_output_handle *handle,
 201                          void *sink_config);
 202        unsigned long (*reset_buffer)(struct coresight_device *csdev,
 203                                      struct perf_output_handle *handle,
 204                                      void *sink_config, bool *lost);
 205        void (*update_buffer)(struct coresight_device *csdev,
 206                              struct perf_output_handle *handle,
 207                              void *sink_config);
 208};
 209
 210/**
 211 * struct coresight_ops_link - basic operations for a link
 212 * Operations available for links.
 213 * @enable:     enables flow between iport and oport.
 214 * @disable:    disables flow between iport and oport.
 215 */
 216struct coresight_ops_link {
 217        int (*enable)(struct coresight_device *csdev, int iport, int oport);
 218        void (*disable)(struct coresight_device *csdev, int iport, int oport);
 219};
 220
 221/**
 222 * struct coresight_ops_source - basic operations for a source
 223 * Operations available for sources.
 224 * @cpu_id:     returns the value of the CPU number this component
 225 *              is associated to.
 226 * @trace_id:   returns the value of the component's trace ID as known
 227 *              to the HW.
 228 * @enable:     enables tracing for a source.
 229 * @disable:    disables tracing for a source.
 230 */
 231struct coresight_ops_source {
 232        int (*cpu_id)(struct coresight_device *csdev);
 233        int (*trace_id)(struct coresight_device *csdev);
 234        int (*enable)(struct coresight_device *csdev,
 235                      struct perf_event_attr *attr,  u32 mode);
 236        void (*disable)(struct coresight_device *csdev);
 237};
 238
 239struct coresight_ops {
 240        const struct coresight_ops_sink *sink_ops;
 241        const struct coresight_ops_link *link_ops;
 242        const struct coresight_ops_source *source_ops;
 243};
 244
 245#ifdef CONFIG_CORESIGHT
 246extern struct coresight_device *
 247coresight_register(struct coresight_desc *desc);
 248extern void coresight_unregister(struct coresight_device *csdev);
 249extern int coresight_enable(struct coresight_device *csdev);
 250extern void coresight_disable(struct coresight_device *csdev);
 251extern int coresight_timeout(void __iomem *addr, u32 offset,
 252                             int position, int value);
 253#else
 254static inline struct coresight_device *
 255coresight_register(struct coresight_desc *desc) { return NULL; }
 256static inline void coresight_unregister(struct coresight_device *csdev) {}
 257static inline int
 258coresight_enable(struct coresight_device *csdev) { return -ENOSYS; }
 259static inline void coresight_disable(struct coresight_device *csdev) {}
 260static inline int coresight_timeout(void __iomem *addr, u32 offset,
 261                                     int position, int value) { return 1; }
 262#endif
 263
 264#ifdef CONFIG_OF
 265extern struct coresight_platform_data *of_get_coresight_platform_data(
 266                                struct device *dev, struct device_node *node);
 267#else
 268static inline struct coresight_platform_data *of_get_coresight_platform_data(
 269        struct device *dev, struct device_node *node) { return NULL; }
 270#endif
 271
 272#ifdef CONFIG_PID_NS
 273static inline unsigned long
 274coresight_vpid_to_pid(unsigned long vpid)
 275{
 276        struct task_struct *task = NULL;
 277        unsigned long pid = 0;
 278
 279        rcu_read_lock();
 280        task = find_task_by_vpid(vpid);
 281        if (task)
 282                pid = task_pid_nr(task);
 283        rcu_read_unlock();
 284
 285        return pid;
 286}
 287#else
 288static inline unsigned long
 289coresight_vpid_to_pid(unsigned long vpid) { return vpid; }
 290#endif
 291
 292#endif
 293