drivers/platform/x86/intel/telemetry/core.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Intel SoC Core Telemetry Driver
   4  * Copyright (C) 2015, Intel Corporation.
   5  * All Rights Reserved.
   6  *
   7  * Telemetry Framework provides platform related PM and performance statistics.
   8  * This file provides the core telemetry API implementation.
   9  */
  10 #include <linux/device.h>
  11 #include <linux/module.h>
  12
  13 #include <asm/intel_telemetry.h>
  14
  15 #define DRIVER_NAME "intel_telemetry_core"
  16
  17 struct telemetry_core_config {
  18         struct telemetry_plt_config *plt_config;
  19         const struct telemetry_core_ops *telem_ops;
  20 };
  21
  22 static struct telemetry_core_config telm_core_conf;
  23
  24 static int telemetry_def_update_events(struct telemetry_evtconfig pss_evtconfig,
  25                                       struct telemetry_evtconfig ioss_evtconfig)
  26 {
  27         return 0;
  28 }
  29
  30 static int telemetry_def_set_sampling_period(u8 pss_period, u8 ioss_period)
  31 {
  32         return 0;
  33 }
  34
  35 static int telemetry_def_get_sampling_period(u8 *pss_min_period,
  36                                              u8 *pss_max_period,
  37                                              u8 *ioss_min_period,
  38                                              u8 *ioss_max_period)
  39 {
  40         return 0;
  41 }
  42
  43 static int telemetry_def_get_eventconfig(
  44                         struct telemetry_evtconfig *pss_evtconfig,
  45                         struct telemetry_evtconfig *ioss_evtconfig,
  46                         int pss_len, int ioss_len)
  47 {
  48         return 0;
  49 }
  50
  51 static int telemetry_def_get_trace_verbosity(enum telemetry_unit telem_unit,
  52                                              u32 *verbosity)
  53 {
  54         return 0;
  55 }
  56
  57
  58 static int telemetry_def_set_trace_verbosity(enum telemetry_unit telem_unit,
  59                                              u32 verbosity)
  60 {
  61         return 0;
  62 }
  63
  64 static int telemetry_def_raw_read_eventlog(enum telemetry_unit telem_unit,
  65                                            struct telemetry_evtlog *evtlog,
  66                                            int len, int log_all_evts)
  67 {
  68         return 0;
  69 }
  70
  71 static int telemetry_def_read_eventlog(enum telemetry_unit telem_unit,
  72                                        struct telemetry_evtlog *evtlog,
  73                                        int len, int log_all_evts)
  74 {
  75         return 0;
  76 }
  77
  78 static int telemetry_def_add_events(u8 num_pss_evts, u8 num_ioss_evts,
  79                                     u32 *pss_evtmap, u32 *ioss_evtmap)
  80 {
  81         return 0;
  82 }
  83
  84 static int telemetry_def_reset_events(void)
  85 {
  86         return 0;
  87 }
  88
  89 static const struct telemetry_core_ops telm_defpltops = {
  90         .set_sampling_period = telemetry_def_set_sampling_period,
  91         .get_sampling_period = telemetry_def_get_sampling_period,
  92         .get_trace_verbosity = telemetry_def_get_trace_verbosity,
  93         .set_trace_verbosity = telemetry_def_set_trace_verbosity,
  94         .raw_read_eventlog = telemetry_def_raw_read_eventlog,
  95         .get_eventconfig = telemetry_def_get_eventconfig,
  96         .read_eventlog = telemetry_def_read_eventlog,
  97         .update_events = telemetry_def_update_events,
  98         .reset_events = telemetry_def_reset_events,
  99         .add_events = telemetry_def_add_events,
 100 };
 101
 102 /**
 103  * telemetry_update_events() - Update telemetry Configuration
 104  * @pss_evtconfig: PSS related config. No change if num_evts = 0.
 105  * @pss_evtconfig: IOSS related config. No change if num_evts = 0.
 106  *
 107  * This API updates the IOSS & PSS Telemetry configuration. Old config
 108  * is overwritten. Call telemetry_reset_events when logging is over
 109  * All sample period values should be in the form of:
 110  * bits[6:3] -> value; bits [0:2]-> Exponent; Period = (Value *16^Exponent)
 111  *
 112  * Return: 0 success, < 0 for failure
 113  */
 114 int telemetry_update_events(struct telemetry_evtconfig pss_evtconfig,
 115                             struct telemetry_evtconfig ioss_evtconfig)
 116 {
 117         return telm_core_conf.telem_ops->update_events(pss_evtconfig,
 118                                                        ioss_evtconfig);
 119 }
 120 EXPORT_SYMBOL_GPL(telemetry_update_events);
 121
 122
 123 /**
 124  * telemetry_set_sampling_period() - Sets the IOSS & PSS sampling period
 125  * @pss_period:  placeholder for PSS Period to be set.
 126  *               Set to 0 if not required to be updated
 127  * @ioss_period: placeholder for IOSS Period to be set
 128  *               Set to 0 if not required to be updated
 129  *
 130  * All values should be in the form of:
 131  * bits[6:3] -> value; bits [0:2]-> Exponent; Period = (Value *16^Exponent)
 132  *
 133  * Return: 0 success, < 0 for failure
 134  */
 135 int telemetry_set_sampling_period(u8 pss_period, u8 ioss_period)
 136 {
 137         return telm_core_conf.telem_ops->set_sampling_period(pss_period,
 138                                                              ioss_period);
 139 }
 140 EXPORT_SYMBOL_GPL(telemetry_set_sampling_period);
 141
 142 /**
 143  * telemetry_get_sampling_period() - Get IOSS & PSS min & max sampling period
 144  * @pss_min_period:  placeholder for PSS Min Period supported
 145  * @pss_max_period:  placeholder for PSS Max Period supported
 146  * @ioss_min_period: placeholder for IOSS Min Period supported
 147  * @ioss_max_period: placeholder for IOSS Max Period supported
 148  *
 149  * All values should be in the form of:
 150  * bits[6:3] -> value; bits [0:2]-> Exponent; Period = (Value *16^Exponent)
 151  *
 152  * Return: 0 success, < 0 for failure
 153  */
 154 int telemetry_get_sampling_period(u8 *pss_min_period, u8 *pss_max_period,
 155                                   u8 *ioss_min_period, u8 *ioss_max_period)
 156 {
 157         return telm_core_conf.telem_ops->get_sampling_period(pss_min_period,
 158                                                              pss_max_period,
 159                                                              ioss_min_period,
 160                                                              ioss_max_period);
 161 }
 162 EXPORT_SYMBOL_GPL(telemetry_get_sampling_period);
 163
 164
 165 /**
 166  * telemetry_reset_events() - Restore the IOSS & PSS configuration to default
 167  *
 168  * Return: 0 success, < 0 for failure
 169  */
 170 int telemetry_reset_events(void)
 171 {
 172         return telm_core_conf.telem_ops->reset_events();
 173 }
 174 EXPORT_SYMBOL_GPL(telemetry_reset_events);
 175
 176 /**
 177  * telemetry_get_eventconfig() - Returns the pss and ioss events enabled
 178  * @pss_evtconfig: Pointer to PSS related configuration.
 179  * @pss_evtconfig: Pointer to IOSS related configuration.
 180  * @pss_len:       Number of u32 elements allocated for pss_evtconfig array
 181  * @ioss_len:      Number of u32 elements allocated for ioss_evtconfig array
 182  *
 183  * Return: 0 success, < 0 for failure
 184  */
 185 int telemetry_get_eventconfig(struct telemetry_evtconfig *pss_evtconfig,
 186                               struct telemetry_evtconfig *ioss_evtconfig,
 187                               int pss_len, int ioss_len)
 188 {
 189         return telm_core_conf.telem_ops->get_eventconfig(pss_evtconfig,
 190                                                          ioss_evtconfig,
 191                                                          pss_len, ioss_len);
 192 }
 193 EXPORT_SYMBOL_GPL(telemetry_get_eventconfig);
 194
 195 /**
 196  * telemetry_add_events() - Add IOSS & PSS configuration to existing settings.
 197  * @num_pss_evts:  Number of PSS Events (<29) in pss_evtmap. Can be 0.
 198  * @num_ioss_evts: Number of IOSS Events (<29) in ioss_evtmap. Can be 0.
 199  * @pss_evtmap:    Array of PSS Event-IDs to Enable
 200  * @ioss_evtmap:   Array of PSS Event-IDs to Enable
 201  *
 202  * Events are appended to Old Configuration. In case of total events > 28, it
 203  * returns error. Call telemetry_reset_events to reset after eventlog done
 204  *
 205  * Return: 0 success, < 0 for failure
 206  */
 207 int telemetry_add_events(u8 num_pss_evts, u8 num_ioss_evts,
 208                          u32 *pss_evtmap, u32 *ioss_evtmap)
 209 {
 210         return telm_core_conf.telem_ops->add_events(num_pss_evts,
 211                                                     num_ioss_evts, pss_evtmap,
 212                                                     ioss_evtmap);
 213 }
 214 EXPORT_SYMBOL_GPL(telemetry_add_events);
 215
 216 /**
 217  * telemetry_read_events() - Fetches samples as specified by evtlog.telem_evt_id
 218  * @telem_unit: Specify whether IOSS or PSS Read
 219  * @evtlog:     Array of telemetry_evtlog structs to fill data
 220  *              evtlog.telem_evt_id specifies the ids to read
 221  * @len:        Length of array of evtlog
 222  *
 223  * Return: number of eventlogs read for success, < 0 for failure
 224  */
 225 int telemetry_read_events(enum telemetry_unit telem_unit,
 226                           struct telemetry_evtlog *evtlog, int len)
 227 {
 228         return telm_core_conf.telem_ops->read_eventlog(telem_unit, evtlog,
 229                                                        len, 0);
 230 }
 231 EXPORT_SYMBOL_GPL(telemetry_read_events);
 232
 233 /**
 234  * telemetry_raw_read_events() - Fetch samples specified by evtlog.telem_evt_id
 235  * @telem_unit: Specify whether IOSS or PSS Read
 236  * @evtlog:     Array of telemetry_evtlog structs to fill data
 237  *              evtlog.telem_evt_id specifies the ids to read
 238  * @len:        Length of array of evtlog
 239  *
 240  * The caller must take care of locking in this case.
 241  *
 242  * Return: number of eventlogs read for success, < 0 for failure
 243  */
 244 int telemetry_raw_read_events(enum telemetry_unit telem_unit,
 245                               struct telemetry_evtlog *evtlog, int len)
 246 {
 247         return telm_core_conf.telem_ops->raw_read_eventlog(telem_unit, evtlog,
 248                                                            len, 0);
 249 }
 250 EXPORT_SYMBOL_GPL(telemetry_raw_read_events);
 251
 252 /**
 253  * telemetry_read_eventlog() - Fetch the Telemetry log from PSS or IOSS
 254  * @telem_unit: Specify whether IOSS or PSS Read
 255  * @evtlog:     Array of telemetry_evtlog structs to fill data
 256  * @len:        Length of array of evtlog
 257  *
 258  * Return: number of eventlogs read for success, < 0 for failure
 259  */
 260 int telemetry_read_eventlog(enum telemetry_unit telem_unit,
 261                             struct telemetry_evtlog *evtlog, int len)
 262 {
 263         return telm_core_conf.telem_ops->read_eventlog(telem_unit, evtlog,
 264                                                        len, 1);
 265 }
 266 EXPORT_SYMBOL_GPL(telemetry_read_eventlog);
 267
 268 /**
 269  * telemetry_raw_read_eventlog() - Fetch the Telemetry log from PSS or IOSS
 270  * @telem_unit: Specify whether IOSS or PSS Read
 271  * @evtlog:     Array of telemetry_evtlog structs to fill data
 272  * @len:        Length of array of evtlog
 273  *
 274  * The caller must take care of locking in this case.
 275  *
 276  * Return: number of eventlogs read for success, < 0 for failure
 277  */
 278 int telemetry_raw_read_eventlog(enum telemetry_unit telem_unit,
 279                                 struct telemetry_evtlog *evtlog, int len)
 280 {
 281         return telm_core_conf.telem_ops->raw_read_eventlog(telem_unit, evtlog,
 282                                                            len, 1);
 283 }
 284 EXPORT_SYMBOL_GPL(telemetry_raw_read_eventlog);
 285
 286
 287 /**
 288  * telemetry_get_trace_verbosity() - Get the IOSS & PSS Trace verbosity
 289  * @telem_unit: Specify whether IOSS or PSS Read
 290  * @verbosity:  Pointer to return Verbosity
 291  *
 292  * Return: 0 success, < 0 for failure
 293  */
 294 int telemetry_get_trace_verbosity(enum telemetry_unit telem_unit,
 295                                   u32 *verbosity)
 296 {
 297         return telm_core_conf.telem_ops->get_trace_verbosity(telem_unit,
 298                                                              verbosity);
 299 }
 300 EXPORT_SYMBOL_GPL(telemetry_get_trace_verbosity);
 301
 302
 303 /**
 304  * telemetry_set_trace_verbosity() - Update the IOSS & PSS Trace verbosity
 305  * @telem_unit: Specify whether IOSS or PSS Read
 306  * @verbosity:  Verbosity to set
 307  *
 308  * Return: 0 success, < 0 for failure
 309  */
 310 int telemetry_set_trace_verbosity(enum telemetry_unit telem_unit, u32 verbosity)
 311 {
 312         return telm_core_conf.telem_ops->set_trace_verbosity(telem_unit,
 313                                                              verbosity);
 314 }
 315 EXPORT_SYMBOL_GPL(telemetry_set_trace_verbosity);
 316
 317 /**
 318  * telemetry_set_pltdata() - Set the platform specific Data
 319  * @ops:        Pointer to ops structure
 320  * @pltconfig:  Platform config data
 321  *
 322  * Usage by other than telemetry pltdrv module is invalid
 323  *
 324  * Return: 0 success, < 0 for failure
 325  */
 326 int telemetry_set_pltdata(const struct telemetry_core_ops *ops,
 327                           struct telemetry_plt_config *pltconfig)
 328 {
 329         if (ops)
 330                 telm_core_conf.telem_ops = ops;
 331
 332         if (pltconfig)
 333                 telm_core_conf.plt_config = pltconfig;
 334
 335         return 0;
 336 }
 337 EXPORT_SYMBOL_GPL(telemetry_set_pltdata);
 338
 339 /**
 340  * telemetry_clear_pltdata() - Clear the platform specific Data
 341  *
 342  * Usage by other than telemetry pltdrv module is invalid
 343  *
 344  * Return: 0 success, < 0 for failure
 345  */
 346 int telemetry_clear_pltdata(void)
 347 {
 348         telm_core_conf.telem_ops = &telm_defpltops;
 349         telm_core_conf.plt_config = NULL;
 350
 351         return 0;
 352 }
 353 EXPORT_SYMBOL_GPL(telemetry_clear_pltdata);
 354
 355 /**
 356  * telemetry_get_pltdata() - Return telemetry platform config
 357  *
 358  * May be used by other telemetry modules to get platform specific
 359  * configuration.
 360  */
 361 struct telemetry_plt_config *telemetry_get_pltdata(void)
 362 {
 363         return telm_core_conf.plt_config;
 364 }
 365 EXPORT_SYMBOL_GPL(telemetry_get_pltdata);
 366
 367 static inline int telemetry_get_pssevtname(enum telemetry_unit telem_unit,
 368                                            const char **name, int len)
 369 {
 370         struct telemetry_unit_config psscfg;
 371         int i;
 372
 373         if (!telm_core_conf.plt_config)
 374                 return -EINVAL;
 375
 376         psscfg = telm_core_conf.plt_config->pss_config;
 377
 378         if (len > psscfg.ssram_evts_used)
 379                 len = psscfg.ssram_evts_used;
 380
 381         for (i = 0; i < len; i++)
 382                 name[i] = psscfg.telem_evts[i].name;
 383
 384         return 0;
 385 }
 386
 387 static inline int telemetry_get_iossevtname(enum telemetry_unit telem_unit,
 388                                             const char **name, int len)
 389 {
 390         struct telemetry_unit_config iosscfg;
 391         int i;
 392
 393         if (!(telm_core_conf.plt_config))
 394                 return -EINVAL;
 395
 396         iosscfg = telm_core_conf.plt_config->ioss_config;
 397
 398         if (len > iosscfg.ssram_evts_used)
 399                 len = iosscfg.ssram_evts_used;
 400
 401         for (i = 0; i < len; i++)
 402                 name[i] = iosscfg.telem_evts[i].name;
 403
 404         return 0;
 405
 406 }
 407
 408 /**
 409  * telemetry_get_evtname() - Checkif platform config is valid
 410  * @telem_unit: Telemetry Unit to check
 411  * @name:       Array of character pointers to contain name
 412  * @len:        length of array name provided by user
 413  *
 414  * Usage by other than telemetry debugfs module is invalid
 415  *
 416  * Return: 0 success, < 0 for failure
 417  */
 418 int telemetry_get_evtname(enum telemetry_unit telem_unit,
 419                           const char **name, int len)
 420 {
 421         int ret = -EINVAL;
 422
 423         if (telem_unit == TELEM_PSS)
 424                 ret = telemetry_get_pssevtname(telem_unit, name, len);
 425
 426         else if (telem_unit == TELEM_IOSS)
 427                 ret = telemetry_get_iossevtname(telem_unit, name, len);
 428
 429         return ret;
 430 }
 431 EXPORT_SYMBOL_GPL(telemetry_get_evtname);
 432
 433 static int __init telemetry_module_init(void)
 434 {
 435         pr_info(pr_fmt(DRIVER_NAME) " Init\n");
 436
 437         telm_core_conf.telem_ops = &telm_defpltops;
 438         return 0;
 439 }
 440
 441 static void __exit telemetry_module_exit(void)
 442 {
 443 }
 444
 445 module_init(telemetry_module_init);
 446 module_exit(telemetry_module_exit);
 447
 448 MODULE_AUTHOR("Souvik Kumar Chakravarty <souvik.k.chakravarty@intel.com>");
 449 MODULE_DESCRIPTION("Intel SoC Telemetry Interface");
 450 MODULE_LICENSE("GPL v2");