drivers/hwtracing/intel_th/intel_th.h

   1 /*
   2  * Intel(R) Trace Hub data structures
   3  *
   4  * Copyright (C) 2014-2015 Intel Corporation.
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms and conditions of the GNU General Public License,
   8  * version 2, as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  13  * more details.
  14  */
  15
  16 #ifndef __INTEL_TH_H__
  17 #define __INTEL_TH_H__
  18
  19 /* intel_th_device device types */
  20 enum {
  21         /* Devices that generate trace data */
  22         INTEL_TH_SOURCE = 0,
  23         /* Output ports (MSC, PTI) */
  24         INTEL_TH_OUTPUT,
  25         /* Switch, the Global Trace Hub (GTH) */
  26         INTEL_TH_SWITCH,
  27 };
  28
  29 /**
  30  * struct intel_th_output - descriptor INTEL_TH_OUTPUT type devices
  31  * @port:       output port number, assigned by the switch
  32  * @type:       GTH_{MSU,CTP,PTI}
  33  * @scratchpad: scratchpad bits to flag when this output is enabled
  34  * @multiblock: true for multiblock output configuration
  35  * @active:     true when this output is enabled
  36  *
  37  * Output port descriptor, used by switch driver to tell which output
  38  * port this output device corresponds to. Filled in at output device's
  39  * probe time by switch::assign(). Passed from output device driver to
  40  * switch related code to enable/disable its port.
  41  */
  42 struct intel_th_output {
  43         int             port;
  44         unsigned int    type;
  45         unsigned int    scratchpad;
  46         bool            multiblock;
  47         bool            active;
  48 };
  49
  50 /**
  51  * struct intel_th_drvdata - describes hardware capabilities and quirks
  52  * @tscu_enable:        device needs SW to enable time stamping unit
  53  */
  54 struct intel_th_drvdata {
  55         unsigned int    tscu_enable        : 1;
  56 };
  57
  58 #define INTEL_TH_CAP(_th, _cap) ((_th)->drvdata ? (_th)->drvdata->_cap : 0)
  59
  60 /**
  61  * struct intel_th_device - device on the intel_th bus
  62  * @dev:                device
  63  * @drvdata:            hardware capabilities/quirks
  64  * @resource:           array of resources available to this device
  65  * @num_resources:      number of resources in @resource array
  66  * @type:               INTEL_TH_{SOURCE,OUTPUT,SWITCH}
  67  * @id:                 device instance or -1
  68  * @host_mode:          Intel TH is controlled by an external debug host
  69  * @output:             output descriptor for INTEL_TH_OUTPUT devices
  70  * @name:               device name to match the driver
  71  */
  72 struct intel_th_device {
  73         struct device           dev;
  74         struct intel_th_drvdata *drvdata;
  75         struct resource         *resource;
  76         unsigned int            num_resources;
  77         unsigned int            type;
  78         int                     id;
  79
  80         /* INTEL_TH_SWITCH specific */
  81         bool                    host_mode;
  82
  83         /* INTEL_TH_OUTPUT specific */
  84         struct intel_th_output  output;
  85
  86         char            name[];
  87 };
  88
  89 #define to_intel_th_device(_d)                          \
  90         container_of((_d), struct intel_th_device, dev)
  91
  92 /**
  93  * intel_th_device_get_resource() - obtain @num'th resource of type @type
  94  * @thdev:      the device to search the resource for
  95  * @type:       resource type
  96  * @num:        number of the resource
  97  */
  98 static inline struct resource *
  99 intel_th_device_get_resource(struct intel_th_device *thdev, unsigned int type,
 100                              unsigned int num)
 101 {
 102         int i;
 103
 104         for (i = 0; i < thdev->num_resources; i++)
 105                 if (resource_type(&thdev->resource[i]) == type && !num--)
 106                         return &thdev->resource[i];
 107
 108         return NULL;
 109 }
 110
 111 /*
 112  * GTH, output ports configuration
 113  */
 114 enum {
 115         GTH_NONE = 0,
 116         GTH_MSU,        /* memory/usb */
 117         GTH_CTP,        /* Common Trace Port */
 118         GTH_LPP,        /* Low Power Path */
 119         GTH_PTI,        /* MIPI-PTI */
 120 };
 121
 122 /**
 123  * intel_th_output_assigned() - if an output device is assigned to a switch port
 124  * @thdev:      the output device
 125  *
 126  * Return:      true if the device is INTEL_TH_OUTPUT *and* is assigned a port
 127  */
 128 static inline bool
 129 intel_th_output_assigned(struct intel_th_device *thdev)
 130 {
 131         return thdev->type == INTEL_TH_OUTPUT &&
 132                 (thdev->output.port >= 0 ||
 133                  thdev->output.type == GTH_NONE);
 134 }
 135
 136 /**
 137  * struct intel_th_driver - driver for an intel_th_device device
 138  * @driver:     generic driver
 139  * @probe:      probe method
 140  * @remove:     remove method
 141  * @assign:     match a given output type device against available outputs
 142  * @unassign:   deassociate an output type device from an output port
 143  * @enable:     enable tracing for a given output device
 144  * @disable:    disable tracing for a given output device
 145  * @irq:        interrupt callback
 146  * @activate:   enable tracing on the output's side
 147  * @deactivate: disable tracing on the output's side
 148  * @fops:       file operations for device nodes
 149  * @attr_group: attributes provided by the driver
 150  *
 151  * Callbacks @probe and @remove are required for all device types.
 152  * Switch device driver needs to fill in @assign, @enable and @disable
 153  * callbacks.
 154  */
 155 struct intel_th_driver {
 156         struct device_driver    driver;
 157         int                     (*probe)(struct intel_th_device *thdev);
 158         void                    (*remove)(struct intel_th_device *thdev);
 159         /* switch (GTH) ops */
 160         int                     (*assign)(struct intel_th_device *thdev,
 161                                           struct intel_th_device *othdev);
 162         void                    (*unassign)(struct intel_th_device *thdev,
 163                                             struct intel_th_device *othdev);
 164         void                    (*enable)(struct intel_th_device *thdev,
 165                                           struct intel_th_output *output);
 166         void                    (*disable)(struct intel_th_device *thdev,
 167                                            struct intel_th_output *output);
 168         /* output ops */
 169         void                    (*irq)(struct intel_th_device *thdev);
 170         int                     (*activate)(struct intel_th_device *thdev);
 171         void                    (*deactivate)(struct intel_th_device *thdev);
 172         /* file_operations for those who want a device node */
 173         const struct file_operations *fops;
 174         /* optional attributes */
 175         struct attribute_group  *attr_group;
 176
 177         /* source ops */
 178         int                     (*set_output)(struct intel_th_device *thdev,
 179                                               unsigned int master);
 180 };
 181
 182 #define to_intel_th_driver(_d)                                  \
 183         container_of((_d), struct intel_th_driver, driver)
 184
 185 #define to_intel_th_driver_or_null(_d)          \
 186         ((_d) ? to_intel_th_driver(_d) : NULL)
 187
 188 /*
 189  * Subdevice tree structure is as follows:
 190  * + struct intel_th device (pci; dev_{get,set}_drvdata()
 191  *   + struct intel_th_device INTEL_TH_SWITCH (GTH)
 192  *     + struct intel_th_device INTEL_TH_OUTPUT (MSU, PTI)
 193  *   + struct intel_th_device INTEL_TH_SOURCE (STH)
 194  *
 195  * In other words, INTEL_TH_OUTPUT devices are children of INTEL_TH_SWITCH;
 196  * INTEL_TH_SWITCH and INTEL_TH_SOURCE are children of the intel_th device.
 197  */
 198 static inline struct intel_th_device *
 199 to_intel_th_parent(struct intel_th_device *thdev)
 200 {
 201         struct device *parent = thdev->dev.parent;
 202
 203         if (!parent)
 204                 return NULL;
 205
 206         return to_intel_th_device(parent);
 207 }
 208
 209 static inline struct intel_th *to_intel_th(struct intel_th_device *thdev)
 210 {
 211         if (thdev->type == INTEL_TH_OUTPUT)
 212                 thdev = to_intel_th_parent(thdev);
 213
 214         if (WARN_ON_ONCE(!thdev || thdev->type == INTEL_TH_OUTPUT))
 215                 return NULL;
 216
 217         return dev_get_drvdata(thdev->dev.parent);
 218 }
 219
 220 struct intel_th *
 221 intel_th_alloc(struct device *dev, struct intel_th_drvdata *drvdata,
 222                struct resource *devres, unsigned int ndevres, int irq);
 223 void intel_th_free(struct intel_th *th);
 224
 225 int intel_th_driver_register(struct intel_th_driver *thdrv);
 226 void intel_th_driver_unregister(struct intel_th_driver *thdrv);
 227
 228 int intel_th_trace_enable(struct intel_th_device *thdev);
 229 int intel_th_trace_disable(struct intel_th_device *thdev);
 230 int intel_th_set_output(struct intel_th_device *thdev,
 231                         unsigned int master);
 232 int intel_th_output_enable(struct intel_th *th, unsigned int otype);
 233
 234 enum {
 235         TH_MMIO_CONFIG = 0,
 236         TH_MMIO_SW = 2,
 237         TH_MMIO_END,
 238 };
 239
 240 #define TH_POSSIBLE_OUTPUTS     8
 241 /* Total number of possible subdevices: outputs + GTH + STH */
 242 #define TH_SUBDEVICE_MAX        (TH_POSSIBLE_OUTPUTS + 2)
 243 #define TH_CONFIGURABLE_MASTERS 256
 244 #define TH_MSC_MAX              2
 245
 246 /**
 247  * struct intel_th - Intel TH controller
 248  * @dev:        driver core's device
 249  * @thdev:      subdevices
 250  * @hub:        "switch" subdevice (GTH)
 251  * @resource:   resources of the entire controller
 252  * @num_thdevs: number of devices in the @thdev array
 253  * @num_resources:      number or resources in the @resource array
 254  * @irq:        irq number
 255  * @id:         this Intel TH controller's device ID in the system
 256  * @major:      device node major for output devices
 257  */
 258 struct intel_th {
 259         struct device           *dev;
 260
 261         struct intel_th_device  *thdev[TH_SUBDEVICE_MAX];
 262         struct intel_th_device  *hub;
 263         struct intel_th_drvdata *drvdata;
 264
 265         struct resource         *resource;
 266         int                     (*activate)(struct intel_th *);
 267         void                    (*deactivate)(struct intel_th *);
 268         unsigned int            num_thdevs;
 269         unsigned int            num_resources;
 270         int                     irq;
 271
 272         int                     id;
 273         int                     major;
 274 #ifdef CONFIG_MODULES
 275         struct work_struct      request_module_work;
 276 #endif /* CONFIG_MODULES */
 277 #ifdef CONFIG_INTEL_TH_DEBUG
 278         struct dentry           *dbg;
 279 #endif
 280 };
 281
 282 static inline struct intel_th_device *
 283 to_intel_th_hub(struct intel_th_device *thdev)
 284 {
 285         if (thdev->type == INTEL_TH_SWITCH)
 286                 return thdev;
 287         else if (thdev->type == INTEL_TH_OUTPUT)
 288                 return to_intel_th_parent(thdev);
 289
 290         return to_intel_th(thdev)->hub;
 291 }
 292
 293 /*
 294  * Register windows
 295  */
 296 enum {
 297         /* Global Trace Hub (GTH) */
 298         REG_GTH_OFFSET          = 0x0000,
 299         REG_GTH_LENGTH          = 0x2000,
 300
 301         /* Timestamp counter unit (TSCU) */
 302         REG_TSCU_OFFSET         = 0x2000,
 303         REG_TSCU_LENGTH         = 0x1000,
 304
 305         /* Software Trace Hub (STH) [0x4000..0x4fff] */
 306         REG_STH_OFFSET          = 0x4000,
 307         REG_STH_LENGTH          = 0x2000,
 308
 309         /* Memory Storage Unit (MSU) [0xa0000..0xa1fff] */
 310         REG_MSU_OFFSET          = 0xa0000,
 311         REG_MSU_LENGTH          = 0x02000,
 312
 313         /* Internal MSU trace buffer [0x80000..0x9ffff] */
 314         BUF_MSU_OFFSET          = 0x80000,
 315         BUF_MSU_LENGTH          = 0x20000,
 316
 317         /* PTI output == same window as GTH */
 318         REG_PTI_OFFSET          = REG_GTH_OFFSET,
 319         REG_PTI_LENGTH          = REG_GTH_LENGTH,
 320
 321         /* DCI Handler (DCIH) == some window as MSU */
 322         REG_DCIH_OFFSET         = REG_MSU_OFFSET,
 323         REG_DCIH_LENGTH         = REG_MSU_LENGTH,
 324 };
 325
 326 /*
 327  * Scratchpad bits: tell firmware and external debuggers
 328  * what we are up to.
 329  */
 330 enum {
 331         /* Memory is the primary destination */
 332         SCRPD_MEM_IS_PRIM_DEST          = BIT(0),
 333         /* XHCI DbC is the primary destination */
 334         SCRPD_DBC_IS_PRIM_DEST          = BIT(1),
 335         /* PTI is the primary destination */
 336         SCRPD_PTI_IS_PRIM_DEST          = BIT(2),
 337         /* BSSB is the primary destination */
 338         SCRPD_BSSB_IS_PRIM_DEST         = BIT(3),
 339         /* PTI is the alternate destination */
 340         SCRPD_PTI_IS_ALT_DEST           = BIT(4),
 341         /* BSSB is the alternate destination */
 342         SCRPD_BSSB_IS_ALT_DEST          = BIT(5),
 343         /* DeepSx exit occurred */
 344         SCRPD_DEEPSX_EXIT               = BIT(6),
 345         /* S4 exit occurred */
 346         SCRPD_S4_EXIT                   = BIT(7),
 347         /* S5 exit occurred */
 348         SCRPD_S5_EXIT                   = BIT(8),
 349         /* MSU controller 0/1 is enabled */
 350         SCRPD_MSC0_IS_ENABLED           = BIT(9),
 351         SCRPD_MSC1_IS_ENABLED           = BIT(10),
 352         /* Sx exit occurred */
 353         SCRPD_SX_EXIT                   = BIT(11),
 354         /* Trigger Unit is enabled */
 355         SCRPD_TRIGGER_IS_ENABLED        = BIT(12),
 356         SCRPD_ODLA_IS_ENABLED           = BIT(13),
 357         SCRPD_SOCHAP_IS_ENABLED         = BIT(14),
 358         SCRPD_STH_IS_ENABLED            = BIT(15),
 359         SCRPD_DCIH_IS_ENABLED           = BIT(16),
 360         SCRPD_VER_IS_ENABLED            = BIT(17),
 361         /* External debugger is using Intel TH */
 362         SCRPD_DEBUGGER_IN_USE           = BIT(24),
 363 };
 364
 365 #endif