drivers/gator/gator_events_mali_4xx.c

   1 /**
   2  * Copyright (C) ARM Limited 2010-2014. All rights reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2 as
   6  * published by the Free Software Foundation.
   7  */
   8
   9 #include "gator.h"
  10
  11 #include <linux/module.h>
  12 #include <linux/time.h>
  13 #include <linux/math64.h>
  14
  15 #include "linux/mali_linux_trace.h"
  16
  17 #include "gator_events_mali_common.h"
  18 #include "gator_events_mali_4xx.h"
  19
  20 /*
  21  * There are (currently) four different variants of the comms between gator and Mali:
  22  * 1 (deprecated): No software counter support
  23  * 2 (deprecated): Tracepoint called for each separate s/w counter value as it appears
  24  * 3 (default): Single tracepoint for all s/w counters in a bundle.
  25  * Interface style 3 is the default if no other is specified.  1 and 2 will be eliminated when
  26  * existing Mali DDKs are upgraded.
  27  * 4. As above, but for the Utgard (Mali-450) driver.
  28  */
  29
  30 #if !defined(GATOR_MALI_INTERFACE_STYLE)
  31 #define GATOR_MALI_INTERFACE_STYLE (3)
  32 #endif
  33
  34 #if GATOR_MALI_INTERFACE_STYLE < 4
  35 #include "mali/mali_mjollnir_profiling_gator_api.h"
  36 #else
  37 #include "mali/mali_utgard_profiling_gator_api.h"
  38 #endif
  39
  40 /*
  41  * Check that the MALI_SUPPORT define is set to one of the allowable device codes.
  42  */
  43 #if (MALI_SUPPORT != MALI_4xx)
  44 #error MALI_SUPPORT set to an invalid device code: expecting MALI_4xx
  45 #endif
  46
  47 /* gatorfs variables for counter enable state,
  48  * the event the counter should count and the
  49  * 'key' (a unique id set by gatord and returned
  50  * by gator.ko)
  51  */
  52 static unsigned long counter_enabled[NUMBER_OF_EVENTS];
  53 static unsigned long counter_event[NUMBER_OF_EVENTS];
  54 static unsigned long counter_key[NUMBER_OF_EVENTS];
  55
  56 /* The data we have recorded */
  57 static u32 counter_data[NUMBER_OF_EVENTS];
  58 /* The address to sample (or 0 if samples are sent to us) */
  59 static u32 *counter_address[NUMBER_OF_EVENTS];
  60
  61 /* An array used to return the data we recorded
  62  * as key,value pairs hence the *2
  63  */
  64 static unsigned long counter_dump[NUMBER_OF_EVENTS * 2];
  65 static unsigned long counter_prev[NUMBER_OF_EVENTS];
  66
  67 /* Note whether tracepoints have been registered */
  68 static int trace_registered;
  69
  70 /*
  71  * These numbers define the actual numbers of each block type that exist in the system. Initially
  72  * these are set to the maxima defined above; if the driver is capable of being queried (newer
  73  * drivers only) then the values may be revised.
  74  */
  75 static unsigned int n_vp_cores = MAX_NUM_VP_CORES;
  76 static unsigned int n_l2_cores = MAX_NUM_L2_CACHE_CORES;
  77 static unsigned int n_fp_cores = MAX_NUM_FP_CORES;
  78
  79 /**
  80  * Calculate the difference and handle the overflow.
  81  */
  82 static u32 get_difference(u32 start, u32 end)
  83 {
  84         if (start - end >= 0) {
  85                 return start - end;
  86         }
  87
  88         // Mali counters are unsigned 32 bit values that wrap.
  89         return (4294967295u - end) + start;
  90 }
  91
  92 /**
  93  * Returns non-zero if the given counter ID is an activity counter.
  94  */
  95 static inline int is_activity_counter(unsigned int event_id)
  96 {
  97         return (event_id >= FIRST_ACTIVITY_EVENT &&
  98                 event_id <= LAST_ACTIVITY_EVENT);
  99 }
 100
 101 /**
 102  * Returns non-zero if the given counter ID is a hardware counter.
 103  */
 104 static inline int is_hw_counter(unsigned int event_id)
 105 {
 106         return (event_id >= FIRST_HW_COUNTER && event_id <= LAST_HW_COUNTER);
 107 }
 108
 109 /*
 110  * These are provided for utgard compatibility.
 111  */
 112 typedef void _mali_profiling_get_mali_version_type(struct _mali_profiling_mali_version *values);
 113 typedef u32 _mali_profiling_get_l2_counters_type(_mali_profiling_l2_counter_values *values);
 114
 115 #if GATOR_MALI_INTERFACE_STYLE == 2
 116 /**
 117  * Returns non-zero if the given counter ID is a software counter.
 118  */
 119 static inline int is_sw_counter(unsigned int event_id)
 120 {
 121         return (event_id >= FIRST_SW_COUNTER && event_id <= LAST_SW_COUNTER);
 122 }
 123 #endif
 124
 125 #if GATOR_MALI_INTERFACE_STYLE == 2
 126 /*
 127  * The Mali DDK uses s64 types to contain software counter values, but gator
 128  * can only use a maximum of 32 bits. This function scales a software counter
 129  * to an appropriate range.
 130  */
 131 static u32 scale_sw_counter_value(unsigned int event_id, signed long long value)
 132 {
 133         u32 scaled_value;
 134
 135         switch (event_id) {
 136         case COUNTER_GLES_UPLOAD_TEXTURE_TIME:
 137         case COUNTER_GLES_UPLOAD_VBO_TIME:
 138                 scaled_value = (u32)div_s64(value, 1000000);
 139                 break;
 140         default:
 141                 scaled_value = (u32)value;
 142                 break;
 143         }
 144
 145         return scaled_value;
 146 }
 147 #endif
 148
 149 /* Probe for continuously sampled counter */
 150 #if 0                           //WE_DONT_CURRENTLY_USE_THIS_SO_SUPPRESS_WARNING
 151 GATOR_DEFINE_PROBE(mali_sample_address, TP_PROTO(unsigned int event_id, u32 *addr))
 152 {
 153         /* Turning on too many pr_debug statements in frequently called functions
 154          * can cause stability and/or performance problems
 155          */
 156         //pr_debug("gator: mali_sample_address %d %d\n", event_id, addr);
 157         if (event_id >= ACTIVITY_VP && event_id <= COUNTER_FP3_C1) {
 158                 counter_address[event_id] = addr;
 159         }
 160 }
 161 #endif
 162
 163 /* Probe for hardware counter events */
 164 GATOR_DEFINE_PROBE(mali_hw_counter, TP_PROTO(unsigned int event_id, unsigned int value))
 165 {
 166         /* Turning on too many pr_debug statements in frequently called functions
 167          * can cause stability and/or performance problems
 168          */
 169         //pr_debug("gator: mali_hw_counter %d %d\n", event_id, value);
 170         if (is_hw_counter(event_id)) {
 171                 counter_data[event_id] = value;
 172         }
 173 }
 174
 175 #if GATOR_MALI_INTERFACE_STYLE == 2
 176 GATOR_DEFINE_PROBE(mali_sw_counter, TP_PROTO(unsigned int event_id, signed long long value))
 177 {
 178         if (is_sw_counter(event_id)) {
 179                 counter_data[event_id] = scale_sw_counter_value(event_id, value);
 180         }
 181 }
 182 #endif /* GATOR_MALI_INTERFACE_STYLE == 2 */
 183
 184 #if GATOR_MALI_INTERFACE_STYLE >= 3
 185 GATOR_DEFINE_PROBE(mali_sw_counters, TP_PROTO(pid_t pid, pid_t tid, void *surface_id, unsigned int *counters))
 186 {
 187         u32 i;
 188
 189         /* Copy over the values for those counters which are enabled. */
 190         for (i = FIRST_SW_COUNTER; i <= LAST_SW_COUNTER; i++) {
 191                 if (counter_enabled[i]) {
 192                         counter_data[i] = (u32)(counters[i - FIRST_SW_COUNTER]);
 193                 }
 194         }
 195 }
 196 #endif /* GATOR_MALI_INTERFACE_STYLE >= 3 */
 197
 198 /**
 199  * Create a single filesystem entry for a specified event.
 200  * @param sb the superblock
 201  * @param root Filesystem root
 202  * @param name The name of the entry to create
 203  * @param event The ID of the event
 204  * @param create_event_item boolean indicating whether to create an 'event' filesystem entry. True to create.
 205  *
 206  * @return 0 if ok, non-zero if the create failed.
 207  */
 208 static int create_fs_entry(struct super_block *sb, struct dentry *root, const char *name, int event, int create_event_item)
 209 {
 210         struct dentry *dir;
 211
 212         dir = gatorfs_mkdir(sb, root, name);
 213
 214         if (!dir) {
 215                 return -1;
 216         }
 217
 218         if (create_event_item) {
 219                 gatorfs_create_ulong(sb, dir, "event", &counter_event[event]);
 220         }
 221
 222         gatorfs_create_ulong(sb, dir, "enabled", &counter_enabled[event]);
 223         gatorfs_create_ro_ulong(sb, dir, "key", &counter_key[event]);
 224
 225         return 0;
 226 }
 227
 228 #if GATOR_MALI_INTERFACE_STYLE > 3
 229 /*
 230  * Read the version info structure if available
 231  */
 232 static void initialise_version_info(void)
 233 {
 234         _mali_profiling_get_mali_version_type *mali_profiling_get_mali_version_symbol;
 235
 236         mali_profiling_get_mali_version_symbol = symbol_get(_mali_profiling_get_mali_version);
 237
 238         if (mali_profiling_get_mali_version_symbol) {
 239                 struct _mali_profiling_mali_version version_info;
 240
 241                 pr_debug("gator: mali online _mali_profiling_get_mali_version symbol @ %p\n",
 242                                 mali_profiling_get_mali_version_symbol);
 243
 244                 /*
 245                  * Revise the number of each different core type using information derived from the DDK.
 246                  */
 247                 mali_profiling_get_mali_version_symbol(&version_info);
 248
 249                 n_fp_cores = version_info.num_of_fp_cores;
 250                 n_vp_cores = version_info.num_of_vp_cores;
 251                 n_l2_cores = version_info.num_of_l2_cores;
 252
 253                 /* Release the function - we're done with it. */
 254                 symbol_put(_mali_profiling_get_mali_version);
 255         } else {
 256                 printk("gator: mali online _mali_profiling_get_mali_version symbol not found\n");
 257         }
 258 }
 259 #endif
 260
 261 static int create_files(struct super_block *sb, struct dentry *root)
 262 {
 263         int event;
 264         const char *mali_name = gator_mali_get_mali_name();
 265
 266         char buf[40];
 267         int core_id;
 268         int counter_number;
 269
 270         pr_debug("gator: Initialising counters with style = %d\n", GATOR_MALI_INTERFACE_STYLE);
 271
 272 #if GATOR_MALI_INTERFACE_STYLE > 3
 273         /*
 274          * Initialise first: this sets up the number of cores available (on compatible DDK versions).
 275          * Ideally this would not need guarding but other parts of the code depend on the interface style being set
 276          * correctly; if it is not then the system can enter an inconsistent state.
 277          */
 278         initialise_version_info();
 279 #endif
 280
 281         /* Vertex processor counters */
 282         for (core_id = 0; core_id < n_vp_cores; core_id++) {
 283                 int activity_counter_id = ACTIVITY_VP_0;
 284                 snprintf(buf, sizeof buf, "ARM_%s_VP_%d_active", mali_name, core_id);
 285                 if (create_fs_entry(sb, root, buf, activity_counter_id, 0) != 0) {
 286                         return -1;
 287                 }
 288
 289                 for (counter_number = 0; counter_number < 2; counter_number++) {
 290                         int counter_id = COUNTER_VP_0_C0 + (2 * core_id) + counter_number;
 291
 292                         snprintf(buf, sizeof buf, "ARM_%s_VP_%d_cnt%d", mali_name, core_id, counter_number);
 293                         if (create_fs_entry(sb, root, buf, counter_id, 1) != 0) {
 294                                 return -1;
 295                         }
 296                 }
 297         }
 298
 299         /* Fragment processors' counters */
 300         for (core_id = 0; core_id < n_fp_cores; core_id++) {
 301                 int activity_counter_id = ACTIVITY_FP_0 + core_id;
 302
 303                 snprintf(buf, sizeof buf, "ARM_%s_FP_%d_active", mali_name, core_id);
 304                 if (create_fs_entry(sb, root, buf, activity_counter_id, 0) != 0) {
 305                         return -1;
 306                 }
 307
 308                 for (counter_number = 0; counter_number < 2; counter_number++) {
 309                         int counter_id = COUNTER_FP_0_C0 + (2 * core_id) + counter_number;
 310
 311                         snprintf(buf, sizeof buf, "ARM_%s_FP_%d_cnt%d", mali_name, core_id, counter_number);
 312                         if (create_fs_entry(sb, root, buf, counter_id, 1) != 0) {
 313                                 return -1;
 314                         }
 315                 }
 316         }
 317
 318         /* L2 Cache counters */
 319         for (core_id = 0; core_id < n_l2_cores; core_id++) {
 320                 for (counter_number = 0; counter_number < 2; counter_number++) {
 321                         int counter_id = COUNTER_L2_0_C0 + (2 * core_id) + counter_number;
 322
 323                         snprintf(buf, sizeof buf, "ARM_%s_L2_%d_cnt%d", mali_name, core_id, counter_number);
 324                         if (create_fs_entry(sb, root, buf, counter_id, 1) != 0) {
 325                                 return -1;
 326                         }
 327                 }
 328         }
 329
 330         /* Now set up the software counter entries */
 331         for (event = FIRST_SW_COUNTER; event <= LAST_SW_COUNTER; event++) {
 332                 snprintf(buf, sizeof(buf), "ARM_%s_SW_%d", mali_name, event - FIRST_SW_COUNTER);
 333
 334                 if (create_fs_entry(sb, root, buf, event, 0) != 0) {
 335                         return -1;
 336                 }
 337         }
 338
 339         /* Now set up the special counter entries */
 340         snprintf(buf, sizeof(buf), "ARM_%s_Filmstrip_cnt0", mali_name);
 341         if (create_fs_entry(sb, root, buf, COUNTER_FILMSTRIP, 1) != 0) {
 342                 return -1;
 343         }
 344
 345 #ifdef DVFS_REPORTED_BY_DDK
 346         snprintf(buf, sizeof(buf), "ARM_%s_Frequency", mali_name);
 347         if (create_fs_entry(sb, root, buf, COUNTER_FREQUENCY, 1) != 0) {
 348                 return -1;
 349         }
 350
 351         snprintf(buf, sizeof(buf), "ARM_%s_Voltage", mali_name);
 352         if (create_fs_entry(sb, root, buf, COUNTER_VOLTAGE, 1) != 0) {
 353                 return -1;
 354         }
 355 #endif
 356
 357         return 0;
 358 }
 359
 360 /*
 361  * Local store for the get_counters entry point into the DDK.
 362  * This is stored here since it is used very regularly.
 363  */
 364 static mali_profiling_get_counters_type *mali_get_counters = NULL;
 365 static _mali_profiling_get_l2_counters_type *mali_get_l2_counters = NULL;
 366
 367 /*
 368  * Examine list of counters between two index limits and determine if any one is enabled.
 369  * Returns 1 if any counter is enabled, 0 if none is.
 370  */
 371 static int is_any_counter_enabled(unsigned int first_counter, unsigned int last_counter)
 372 {
 373         unsigned int i;
 374
 375         for (i = first_counter; i <= last_counter; i++) {
 376                 if (counter_enabled[i]) {
 377                         return 1;       /* At least one counter is enabled */
 378                 }
 379         }
 380
 381         return 0;               /* No s/w counters enabled */
 382 }
 383
 384 static void init_counters(unsigned int from_counter, unsigned int to_counter)
 385 {
 386         unsigned int counter_id;
 387
 388         /* If a Mali driver is present and exporting the appropriate symbol
 389          * then we can request the HW counters (of which there are only 2)
 390          * be configured to count the desired events
 391          */
 392         mali_profiling_set_event_type *mali_set_hw_event;
 393
 394         mali_set_hw_event = symbol_get(_mali_profiling_set_event);
 395
 396         if (mali_set_hw_event) {
 397                 pr_debug("gator: mali online _mali_profiling_set_event symbol @ %p\n", mali_set_hw_event);
 398
 399                 for (counter_id = from_counter; counter_id <= to_counter; counter_id++) {
 400                         if (counter_enabled[counter_id]) {
 401                                 mali_set_hw_event(counter_id, counter_event[counter_id]);
 402                         } else {
 403                                 mali_set_hw_event(counter_id, 0xFFFFFFFF);
 404                         }
 405                 }
 406
 407                 symbol_put(_mali_profiling_set_event);
 408         } else {
 409                 printk("gator: mali online _mali_profiling_set_event symbol not found\n");
 410         }
 411 }
 412
 413 static void mali_counter_initialize(void)
 414 {
 415         int i;
 416         int core_id;
 417
 418         mali_profiling_control_type *mali_control;
 419
 420         init_counters(COUNTER_L2_0_C0, COUNTER_L2_0_C0 + (2 * n_l2_cores) - 1);
 421         init_counters(COUNTER_VP_0_C0, COUNTER_VP_0_C0 + (2 * n_vp_cores) - 1);
 422         init_counters(COUNTER_FP_0_C0, COUNTER_FP_0_C0 + (2 * n_fp_cores) - 1);
 423
 424         /* Generic control interface for Mali DDK. */
 425         mali_control = symbol_get(_mali_profiling_control);
 426         if (mali_control) {
 427                 /* The event attribute in the XML file keeps the actual frame rate. */
 428                 unsigned int rate = counter_event[COUNTER_FILMSTRIP] & 0xff;
 429                 unsigned int resize_factor = (counter_event[COUNTER_FILMSTRIP] >> 8) & 0xff;
 430
 431                 pr_debug("gator: mali online _mali_profiling_control symbol @ %p\n", mali_control);
 432
 433                 mali_control(SW_COUNTER_ENABLE, (is_any_counter_enabled(FIRST_SW_COUNTER, LAST_SW_COUNTER) ? 1 : 0));
 434                 mali_control(FBDUMP_CONTROL_ENABLE, (counter_enabled[COUNTER_FILMSTRIP] ? 1 : 0));
 435                 mali_control(FBDUMP_CONTROL_RATE, rate);
 436                 mali_control(FBDUMP_CONTROL_RESIZE_FACTOR, resize_factor);
 437
 438                 pr_debug("gator: sent mali_control enabled=%d, rate=%d\n", (counter_enabled[COUNTER_FILMSTRIP] ? 1 : 0), rate);
 439
 440                 symbol_put(_mali_profiling_control);
 441         } else {
 442                 printk("gator: mali online _mali_profiling_control symbol not found\n");
 443         }
 444
 445         mali_get_counters = symbol_get(_mali_profiling_get_counters);
 446         if (mali_get_counters) {
 447                 pr_debug("gator: mali online _mali_profiling_get_counters symbol @ %p\n", mali_get_counters);
 448
 449         } else {
 450                 pr_debug("gator WARNING: mali _mali_profiling_get_counters symbol not defined");
 451         }
 452
 453         mali_get_l2_counters = symbol_get(_mali_profiling_get_l2_counters);
 454         if (mali_get_l2_counters) {
 455                 pr_debug("gator: mali online _mali_profiling_get_l2_counters symbol @ %p\n", mali_get_l2_counters);
 456
 457         } else {
 458                 pr_debug("gator WARNING: mali _mali_profiling_get_l2_counters symbol not defined");
 459         }
 460
 461         if (!mali_get_counters && !mali_get_l2_counters) {
 462                 pr_debug("gator: WARNING: no L2 counters available");
 463                 n_l2_cores = 0;
 464         }
 465
 466         for (core_id = 0; core_id < n_l2_cores; core_id++) {
 467                 int counter_id = COUNTER_L2_0_C0 + (2 * core_id);
 468                 counter_prev[counter_id] = 0;
 469                 counter_prev[counter_id + 1] = 0;
 470         }
 471
 472         /* Clear counters in the start */
 473         for (i = 0; i < NUMBER_OF_EVENTS; i++) {
 474                 counter_data[i] = 0;
 475         }
 476 }
 477
 478 static void mali_counter_deinitialize(void)
 479 {
 480         mali_profiling_set_event_type *mali_set_hw_event;
 481         mali_profiling_control_type *mali_control;
 482
 483         mali_set_hw_event = symbol_get(_mali_profiling_set_event);
 484
 485         if (mali_set_hw_event) {
 486                 int i;
 487
 488                 pr_debug("gator: mali offline _mali_profiling_set_event symbol @ %p\n", mali_set_hw_event);
 489                 for (i = FIRST_HW_COUNTER; i <= LAST_HW_COUNTER; i++) {
 490                         mali_set_hw_event(i, 0xFFFFFFFF);
 491                 }
 492
 493                 symbol_put(_mali_profiling_set_event);
 494         } else {
 495                 printk("gator: mali offline _mali_profiling_set_event symbol not found\n");
 496         }
 497
 498         /* Generic control interface for Mali DDK. */
 499         mali_control = symbol_get(_mali_profiling_control);
 500
 501         if (mali_control) {
 502                 pr_debug("gator: mali offline _mali_profiling_control symbol @ %p\n", mali_control);
 503
 504                 /* Reset the DDK state - disable counter collection */
 505                 mali_control(SW_COUNTER_ENABLE, 0);
 506
 507                 mali_control(FBDUMP_CONTROL_ENABLE, 0);
 508
 509                 symbol_put(_mali_profiling_control);
 510         } else {
 511                 printk("gator: mali offline _mali_profiling_control symbol not found\n");
 512         }
 513
 514         if (mali_get_counters) {
 515                 symbol_put(_mali_profiling_get_counters);
 516         }
 517
 518         if (mali_get_l2_counters) {
 519                 symbol_put(_mali_profiling_get_l2_counters);
 520         }
 521 }
 522
 523 static int start(void)
 524 {
 525         // register tracepoints
 526         if (GATOR_REGISTER_TRACE(mali_hw_counter)) {
 527                 printk("gator: mali_hw_counter tracepoint failed to activate\n");
 528                 return -1;
 529         }
 530
 531 #if GATOR_MALI_INTERFACE_STYLE == 1
 532         /* None. */
 533 #elif GATOR_MALI_INTERFACE_STYLE == 2
 534         /* For patched Mali driver. */
 535         if (GATOR_REGISTER_TRACE(mali_sw_counter)) {
 536                 printk("gator: mali_sw_counter tracepoint failed to activate\n");
 537                 return -1;
 538         }
 539 #elif GATOR_MALI_INTERFACE_STYLE >= 3
 540         /* For Mali drivers with built-in support. */
 541         if (GATOR_REGISTER_TRACE(mali_sw_counters)) {
 542                 printk("gator: mali_sw_counters tracepoint failed to activate\n");
 543                 return -1;
 544         }
 545 #else
 546 #error Unknown GATOR_MALI_INTERFACE_STYLE option.
 547 #endif
 548
 549         trace_registered = 1;
 550
 551         mali_counter_initialize();
 552         return 0;
 553 }
 554
 555 static void stop(void)
 556 {
 557         unsigned int cnt;
 558
 559         pr_debug("gator: mali stop\n");
 560
 561         if (trace_registered) {
 562                 GATOR_UNREGISTER_TRACE(mali_hw_counter);
 563
 564 #if GATOR_MALI_INTERFACE_STYLE == 1
 565                 /* None. */
 566 #elif GATOR_MALI_INTERFACE_STYLE == 2
 567                 /* For patched Mali driver. */
 568                 GATOR_UNREGISTER_TRACE(mali_sw_counter);
 569 #elif GATOR_MALI_INTERFACE_STYLE >= 3
 570                 /* For Mali drivers with built-in support. */
 571                 GATOR_UNREGISTER_TRACE(mali_sw_counters);
 572 #else
 573 #error Unknown GATOR_MALI_INTERFACE_STYLE option.
 574 #endif
 575
 576                 pr_debug("gator: mali timeline tracepoint deactivated\n");
 577
 578                 trace_registered = 0;
 579         }
 580
 581         for (cnt = 0; cnt < NUMBER_OF_EVENTS; cnt++) {
 582                 counter_enabled[cnt] = 0;
 583                 counter_event[cnt] = 0;
 584                 counter_address[cnt] = NULL;
 585         }
 586
 587         mali_counter_deinitialize();
 588 }
 589
 590 static void dump_counters(unsigned int from_counter, unsigned int to_counter, unsigned int *len)
 591 {
 592         unsigned int counter_id;
 593
 594         for (counter_id = from_counter; counter_id <= to_counter; counter_id++) {
 595                 if (counter_enabled[counter_id]) {
 596                         counter_dump[(*len)++] = counter_key[counter_id];
 597                         counter_dump[(*len)++] = counter_data[counter_id];
 598
 599                         counter_data[counter_id] = 0;
 600                 }
 601         }
 602 }
 603
 604 static int read(int **buffer)
 605 {
 606         int len = 0;
 607
 608         if (!on_primary_core())
 609                 return 0;
 610
 611         // Read the L2 C0 and C1 here.
 612         if (n_l2_cores > 0 && is_any_counter_enabled(COUNTER_L2_0_C0, COUNTER_L2_0_C0 + (2 * n_l2_cores))) {
 613                 unsigned int unavailable_l2_caches = 0;
 614                 _mali_profiling_l2_counter_values cache_values;
 615                 unsigned int cache_id;
 616                 struct _mali_profiling_core_counters *per_core;
 617
 618                 /* Poke the driver to get the counter values - older style; only one L2 cache */
 619                 if (mali_get_l2_counters) {
 620                         unavailable_l2_caches = mali_get_l2_counters(&cache_values);
 621                 } else if (mali_get_counters) {
 622                         per_core = &cache_values.cores[0];
 623                         mali_get_counters(&per_core->source0, &per_core->value0, &per_core->source1, &per_core->value1);
 624                 } else {
 625                         /* This should never happen, as n_l2_caches is only set > 0 if one of the above functions is found. */
 626                 }
 627
 628                 /* Fill in the two cache counter values for each cache block. */
 629                 for (cache_id = 0; cache_id < n_l2_cores; cache_id++) {
 630                         unsigned int counter_id_0 = COUNTER_L2_0_C0 + (2 * cache_id);
 631                         unsigned int counter_id_1 = counter_id_0 + 1;
 632
 633                         if ((1 << cache_id) & unavailable_l2_caches) {
 634                                 continue; /* This cache is unavailable (powered-off, possibly). */
 635                         }
 636
 637                         per_core = &cache_values.cores[cache_id];
 638
 639                         if (counter_enabled[counter_id_0]) {
 640                                 // Calculate and save src0's counter val0
 641                                 counter_dump[len++] = counter_key[counter_id_0];
 642                                 counter_dump[len++] = get_difference(per_core->value0, counter_prev[counter_id_0]);
 643                         }
 644
 645                         if (counter_enabled[counter_id_1]) {
 646                                 // Calculate and save src1's counter val1
 647                                 counter_dump[len++] = counter_key[counter_id_1];
 648                                 counter_dump[len++] = get_difference(per_core->value1, counter_prev[counter_id_1]);
 649                         }
 650
 651                         // Save the previous values for the counters.
 652                         counter_prev[counter_id_0] = per_core->value0;
 653                         counter_prev[counter_id_1] = per_core->value1;
 654                 }
 655         }
 656
 657         /* Process other (non-timeline) counters. */
 658         dump_counters(COUNTER_VP_0_C0, COUNTER_VP_0_C0 + (2 * n_vp_cores) - 1, &len);
 659         dump_counters(COUNTER_FP_0_C0, COUNTER_FP_0_C0 + (2 * n_fp_cores) - 1, &len);
 660
 661         dump_counters(FIRST_SW_COUNTER, LAST_SW_COUNTER, &len);
 662
 663 #ifdef DVFS_REPORTED_BY_DDK
 664         {
 665                 int cnt;
 666                 /*
 667                  * Add in the voltage and frequency counters if enabled.  Note that, since these are
 668                  * actually passed as events, the counter value should not be cleared.
 669                  */
 670                 cnt = COUNTER_FREQUENCY;
 671                 if (counter_enabled[cnt]) {
 672                         counter_dump[len++] = counter_key[cnt];
 673                         counter_dump[len++] = counter_data[cnt];
 674                 }
 675
 676                 cnt = COUNTER_VOLTAGE;
 677                 if (counter_enabled[cnt]) {
 678                         counter_dump[len++] = counter_key[cnt];
 679                         counter_dump[len++] = counter_data[cnt];
 680                 }
 681         }
 682 #endif
 683
 684         if (buffer) {
 685                 *buffer = (int *)counter_dump;
 686         }
 687
 688         return len;
 689 }
 690
 691 static struct gator_interface gator_events_mali_interface = {
 692         .create_files = create_files,
 693         .start = start,
 694         .stop = stop,
 695         .read = read,
 696 };
 697
 698 extern void gator_events_mali_log_dvfs_event(unsigned int frequency_mhz, unsigned int voltage_mv)
 699 {
 700 #ifdef DVFS_REPORTED_BY_DDK
 701         counter_data[COUNTER_FREQUENCY] = frequency_mhz;
 702         counter_data[COUNTER_VOLTAGE] = voltage_mv;
 703 #endif
 704 }
 705
 706 int gator_events_mali_init(void)
 707 {
 708         unsigned int cnt;
 709
 710         pr_debug("gator: mali init\n");
 711
 712         for (cnt = 0; cnt < NUMBER_OF_EVENTS; cnt++) {
 713                 counter_enabled[cnt] = 0;
 714                 counter_event[cnt] = 0;
 715                 counter_key[cnt] = gator_events_get_key();
 716                 counter_address[cnt] = NULL;
 717                 counter_data[cnt] = 0;
 718         }
 719
 720         trace_registered = 0;
 721
 722         return gator_events_install(&gator_events_mali_interface);
 723 }