driver/gator_events_mali_t6xx_hw.c

   1 /**
   2  * Copyright (C) ARM Limited 2012-2013. 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
  10 #include "gator.h"
  11
  12 #include <linux/module.h>
  13 #include <linux/time.h>
  14 #include <linux/math64.h>
  15 #include <linux/slab.h>
  16 #include <asm/io.h>
  17
  18 /* Mali T6xx DDK includes */
  19 #include "linux/mali_linux_trace.h"
  20 #include "kbase/src/common/mali_kbase.h"
  21 #include "kbase/src/linux/mali_kbase_mem_linux.h"
  22
  23 #include "gator_events_mali_common.h"
  24
  25 /* If API version is not specified then assume API version 1. */
  26 #ifndef MALI_DDK_GATOR_API_VERSION
  27 #define MALI_DDK_GATOR_API_VERSION 1
  28 #endif
  29
  30 #if (MALI_DDK_GATOR_API_VERSION != 1) && (MALI_DDK_GATOR_API_VERSION != 2)
  31 #error MALI_DDK_GATOR_API_VERSION is invalid (must be 1 for r1/r2 DDK, or 2 for r3 DDK).
  32 #endif
  33
  34 /*
  35  * Mali-T6xx
  36  */
  37 typedef struct kbase_device *kbase_find_device_type(int);
  38 typedef kbase_context *kbase_create_context_type(kbase_device *);
  39 typedef void kbase_destroy_context_type(kbase_context *);
  40
  41 #if MALI_DDK_GATOR_API_VERSION == 1
  42 typedef void *kbase_va_alloc_type(kbase_context *, u32);
  43 typedef void kbase_va_free_type(kbase_context *, void *);
  44 #elif MALI_DDK_GATOR_API_VERSION == 2
  45 typedef void *kbase_va_alloc_type(kbase_context *, u32, kbase_hwc_dma_mapping * handle);
  46 typedef void kbase_va_free_type(kbase_context *, kbase_hwc_dma_mapping * handle);
  47 #endif
  48
  49 typedef mali_error kbase_instr_hwcnt_enable_type(kbase_context *, kbase_uk_hwcnt_setup *);
  50 typedef mali_error kbase_instr_hwcnt_disable_type(kbase_context *);
  51 typedef mali_error kbase_instr_hwcnt_clear_type(kbase_context *);
  52 typedef mali_error kbase_instr_hwcnt_dump_irq_type(kbase_context *);
  53 typedef mali_bool kbase_instr_hwcnt_dump_complete_type(kbase_context *, mali_bool *);
  54
  55 static kbase_find_device_type *kbase_find_device_symbol;
  56 static kbase_create_context_type *kbase_create_context_symbol;
  57 static kbase_va_alloc_type *kbase_va_alloc_symbol;
  58 static kbase_instr_hwcnt_enable_type *kbase_instr_hwcnt_enable_symbol;
  59 static kbase_instr_hwcnt_clear_type *kbase_instr_hwcnt_clear_symbol;
  60 static kbase_instr_hwcnt_dump_irq_type *kbase_instr_hwcnt_dump_irq_symbol;
  61 static kbase_instr_hwcnt_dump_complete_type *kbase_instr_hwcnt_dump_complete_symbol;
  62 static kbase_instr_hwcnt_disable_type *kbase_instr_hwcnt_disable_symbol;
  63 static kbase_va_free_type *kbase_va_free_symbol;
  64 static kbase_destroy_context_type *kbase_destroy_context_symbol;
  65
  66 /** The interval between reads, in ns.
  67  *
  68  * Earlier we introduced
  69  * a 'hold off for 1ms after last read' to resolve MIDBASE-2178 and MALINE-724.
  70  * However, the 1ms hold off is too long if no context switches occur as there is a race
  71  * between this value and the tick of the read clock in gator which is also 1ms. If we 'miss' the
  72  * current read, the counter values are effectively 'spread' over 2ms and the values seen are half
  73  * what they should be (since Streamline averages over sample time). In the presence of context switches
  74  * this spread can vary and markedly affect the counters.  Currently there is no 'proper' solution to
  75  * this, but empirically we have found that reducing the minimum read interval to 950us causes the
  76  * counts to be much more stable.
  77  */
  78 static const int READ_INTERVAL_NSEC = 950000;
  79
  80 #if GATOR_TEST
  81 #include "gator_events_mali_t6xx_hw_test.c"
  82 #endif
  83
  84 /* Blocks for HW counters */
  85 enum {
  86         JM_BLOCK = 0,
  87         TILER_BLOCK,
  88         SHADER_BLOCK,
  89         MMU_BLOCK
  90 };
  91
  92 /* Counters for Mali-T6xx:
  93  *
  94  *  - HW counters, 4 blocks
  95  *    For HW counters we need strings to create /dev/gator/events files.
  96  *    Enums are not needed because the position of the HW name in the array is the same
  97  *    of the corresponding value in the received block of memory.
  98  *    HW counters are requested by calculating a bitmask, passed then to the driver.
  99  *    Every millisecond a HW counters dump is requested, and if the previous has been completed they are read.
 100  */
 101
 102 /* Hardware Counters */
 103 static const char *const hardware_counter_names[] = {
 104         /* Job Manager */
 105         "",
 106         "",
 107         "",
 108         "",
 109         "MESSAGES_SENT",
 110         "MESSAGES_RECEIVED",
 111         "GPU_ACTIVE",           /* 6 */
 112         "IRQ_ACTIVE",
 113         "JS0_JOBS",
 114         "JS0_TASKS",
 115         "JS0_ACTIVE",
 116         "",
 117         "JS0_WAIT_READ",
 118         "JS0_WAIT_ISSUE",
 119         "JS0_WAIT_DEPEND",
 120         "JS0_WAIT_FINISH",
 121         "JS1_JOBS",
 122         "JS1_TASKS",
 123         "JS1_ACTIVE",
 124         "",
 125         "JS1_WAIT_READ",
 126         "JS1_WAIT_ISSUE",
 127         "JS1_WAIT_DEPEND",
 128         "JS1_WAIT_FINISH",
 129         "JS2_JOBS",
 130         "JS2_TASKS",
 131         "JS2_ACTIVE",
 132         "",
 133         "JS2_WAIT_READ",
 134         "JS2_WAIT_ISSUE",
 135         "JS2_WAIT_DEPEND",
 136         "JS2_WAIT_FINISH",
 137         "JS3_JOBS",
 138         "JS3_TASKS",
 139         "JS3_ACTIVE",
 140         "",
 141         "JS3_WAIT_READ",
 142         "JS3_WAIT_ISSUE",
 143         "JS3_WAIT_DEPEND",
 144         "JS3_WAIT_FINISH",
 145         "JS4_JOBS",
 146         "JS4_TASKS",
 147         "JS4_ACTIVE",
 148         "",
 149         "JS4_WAIT_READ",
 150         "JS4_WAIT_ISSUE",
 151         "JS4_WAIT_DEPEND",
 152         "JS4_WAIT_FINISH",
 153         "JS5_JOBS",
 154         "JS5_TASKS",
 155         "JS5_ACTIVE",
 156         "",
 157         "JS5_WAIT_READ",
 158         "JS5_WAIT_ISSUE",
 159         "JS5_WAIT_DEPEND",
 160         "JS5_WAIT_FINISH",
 161         "JS6_JOBS",
 162         "JS6_TASKS",
 163         "JS6_ACTIVE",
 164         "",
 165         "JS6_WAIT_READ",
 166         "JS6_WAIT_ISSUE",
 167         "JS6_WAIT_DEPEND",
 168         "JS6_WAIT_FINISH",
 169
 170         /*Tiler */
 171         "",
 172         "",
 173         "",
 174         "JOBS_PROCESSED",
 175         "TRIANGLES",
 176         "QUADS",
 177         "POLYGONS",
 178         "POINTS",
 179         "LINES",
 180         "VCACHE_HIT",
 181         "VCACHE_MISS",
 182         "FRONT_FACING",
 183         "BACK_FACING",
 184         "PRIM_VISIBLE",
 185         "PRIM_CULLED",
 186         "PRIM_CLIPPED",
 187         "LEVEL0",
 188         "LEVEL1",
 189         "LEVEL2",
 190         "LEVEL3",
 191         "LEVEL4",
 192         "LEVEL5",
 193         "LEVEL6",
 194         "LEVEL7",
 195         "COMMAND_1",
 196         "COMMAND_2",
 197         "COMMAND_3",
 198         "COMMAND_4",
 199         "COMMAND_4_7",
 200         "COMMAND_8_15",
 201         "COMMAND_16_63",
 202         "COMMAND_64",
 203         "COMPRESS_IN",
 204         "COMPRESS_OUT",
 205         "COMPRESS_FLUSH",
 206         "TIMESTAMPS",
 207         "PCACHE_HIT",
 208         "PCACHE_MISS",
 209         "PCACHE_LINE",
 210         "PCACHE_STALL",
 211         "WRBUF_HIT",
 212         "WRBUF_MISS",
 213         "WRBUF_LINE",
 214         "WRBUF_PARTIAL",
 215         "WRBUF_STALL",
 216         "ACTIVE",
 217         "LOADING_DESC",
 218         "INDEX_WAIT",
 219         "INDEX_RANGE_WAIT",
 220         "VERTEX_WAIT",
 221         "PCACHE_WAIT",
 222         "WRBUF_WAIT",
 223         "BUS_READ",
 224         "BUS_WRITE",
 225         "",
 226         "",
 227         "",
 228         "",
 229         "",
 230         "UTLB_STALL",
 231         "UTLB_REPLAY_MISS",
 232         "UTLB_REPLAY_FULL",
 233         "UTLB_NEW_MISS",
 234         "UTLB_HIT",
 235
 236         /* Shader Core */
 237         "",
 238         "",
 239         "",
 240         "SHADER_CORE_ACTIVE",
 241         "FRAG_ACTIVE",
 242         "FRAG_PRIMATIVES",
 243         "FRAG_PRIMATIVES_DROPPED",
 244         "FRAG_CYCLE_DESC",
 245         "FRAG_CYCLES_PLR",
 246         "FRAG_CYCLES_VERT",
 247         "FRAG_CYCLES_TRISETUP",
 248         "FRAG_CYCLES_RAST",
 249         "FRAG_THREADS",
 250         "FRAG_DUMMY_THREADS",
 251         "FRAG_QUADS_RAST",
 252         "FRAG_QUADS_EZS_TEST",
 253         "FRAG_QUADS_EZS_KILLED",
 254         "FRAG_QUADS_LZS_TEST",
 255         "FRAG_QUADS_LZS_KILLED",
 256         "FRAG_CYCLE_NO_TILE",
 257         "FRAG_NUM_TILES",
 258         "FRAG_TRANS_ELIM",
 259         "COMPUTE_ACTIVE",
 260         "COMPUTE_TASKS",
 261         "COMPUTE_THREADS",
 262         "COMPUTE_CYCLES_DESC",
 263         "TRIPIPE_ACTIVE",
 264         "ARITH_WORDS",
 265         "ARITH_CYCLES_REG",
 266         "ARITH_CYCLES_L0",
 267         "ARITH_FRAG_DEPEND",
 268         "LS_WORDS",
 269         "LS_ISSUES",
 270         "LS_RESTARTS",
 271         "LS_REISSUES_MISS",
 272         "LS_REISSUES_VD",
 273         "LS_REISSUE_ATTRIB_MISS",
 274         "LS_NO_WB",
 275         "TEX_WORDS",
 276         "TEX_BUBBLES",
 277         "TEX_WORDS_L0",
 278         "TEX_WORDS_DESC",
 279         "TEX_THREADS",
 280         "TEX_RECIRC_FMISS",
 281         "TEX_RECIRC_DESC",
 282         "TEX_RECIRC_MULTI",
 283         "TEX_RECIRC_PMISS",
 284         "TEX_RECIRC_CONF",
 285         "LSC_READ_HITS",
 286         "LSC_READ_MISSES",
 287         "LSC_WRITE_HITS",
 288         "LSC_WRITE_MISSES",
 289         "LSC_ATOMIC_HITS",
 290         "LSC_ATOMIC_MISSES",
 291         "LSC_LINE_FETCHES",
 292         "LSC_DIRTY_LINE",
 293         "LSC_SNOOPS",
 294         "AXI_TLB_STALL",
 295         "AXI_TLB_MIESS",
 296         "AXI_TLB_TRANSACTION",
 297         "LS_TLB_MISS",
 298         "LS_TLB_HIT",
 299         "AXI_BEATS_READ",
 300         "AXI_BEATS_WRITTEN",
 301
 302         /*L2 and MMU */
 303         "",
 304         "",
 305         "",
 306         "",
 307         "MMU_TABLE_WALK",
 308         "MMU_REPLAY_MISS",
 309         "MMU_REPLAY_FULL",
 310         "MMU_NEW_MISS",
 311         "MMU_HIT",
 312         "",
 313         "",
 314         "",
 315         "",
 316         "",
 317         "",
 318         "",
 319         "UTLB_STALL",
 320         "UTLB_REPLAY_MISS",
 321         "UTLB_REPLAY_FULL",
 322         "UTLB_NEW_MISS",
 323         "UTLB_HIT",
 324         "",
 325         "",
 326         "",
 327         "",
 328         "",
 329         "",
 330         "",
 331         "",
 332         "",
 333         "L2_WRITE_BEATS",
 334         "L2_READ_BEATS",
 335         "L2_ANY_LOOKUP",
 336         "L2_READ_LOOKUP",
 337         "L2_SREAD_LOOKUP",
 338         "L2_READ_REPLAY",
 339         "L2_READ_SNOOP",
 340         "L2_READ_HIT",
 341         "L2_CLEAN_MISS",
 342         "L2_WRITE_LOOKUP",
 343         "L2_SWRITE_LOOKUP",
 344         "L2_WRITE_REPLAY",
 345         "L2_WRITE_SNOOP",
 346         "L2_WRITE_HIT",
 347         "L2_EXT_READ_FULL",
 348         "L2_EXT_READ_HALF",
 349         "L2_EXT_WRITE_FULL",
 350         "L2_EXT_WRITE_HALF",
 351         "L2_EXT_READ",
 352         "L2_EXT_READ_LINE",
 353         "L2_EXT_WRITE",
 354         "L2_EXT_WRITE_LINE",
 355         "L2_EXT_WRITE_SMALL",
 356         "L2_EXT_BARRIER",
 357         "L2_EXT_AR_STALL",
 358         "L2_EXT_R_BUF_FULL",
 359         "L2_EXT_RD_BUF_FULL",
 360         "L2_EXT_R_RAW",
 361         "L2_EXT_W_STALL",
 362         "L2_EXT_W_BUF_FULL",
 363         "L2_EXT_R_W_HAZARD",
 364         "L2_TAG_HAZARD",
 365         "L2_SNOOP_FULL",
 366         "L2_REPLAY_FULL"
 367 };
 368
 369 #define NUMBER_OF_HARDWARE_COUNTERS (sizeof(hardware_counter_names) / sizeof(hardware_counter_names[0]))
 370
 371 #define GET_HW_BLOCK(c) (((c) >> 6) & 0x3)
 372 #define GET_COUNTER_OFFSET(c) ((c) & 0x3f)
 373
 374 /* Memory to dump hardware counters into */
 375 static void *kernel_dump_buffer;
 376
 377 #if MALI_DDK_GATOR_API_VERSION == 2
 378 /* DMA state used to manage lifetime of the buffer */
 379 kbase_hwc_dma_mapping kernel_dump_buffer_handle;
 380 #endif
 381
 382 /* kbase context and device */
 383 static kbase_context *kbcontext = NULL;
 384 static struct kbase_device *kbdevice = NULL;
 385
 386 /*
 387  * The following function has no external prototype in older DDK revisions.  When the DDK
 388  * is updated then this should be removed.
 389  */
 390 struct kbase_device *kbase_find_device(int minor);
 391
 392 static volatile bool kbase_device_busy = false;
 393 static unsigned int num_hardware_counters_enabled;
 394
 395 /*
 396  * gatorfs variables for counter enable state
 397  */
 398 static mali_counter counters[NUMBER_OF_HARDWARE_COUNTERS];
 399
 400 /* An array used to return the data we recorded
 401  * as key,value pairs hence the *2
 402  */
 403 static unsigned long counter_dump[NUMBER_OF_HARDWARE_COUNTERS * 2];
 404
 405 #define SYMBOL_GET(FUNCTION, ERROR_COUNT) \
 406         if(FUNCTION ## _symbol) \
 407         { \
 408                 printk("gator: mali " #FUNCTION " symbol was already registered\n"); \
 409                 (ERROR_COUNT)++; \
 410         } \
 411         else \
 412         { \
 413                 FUNCTION ## _symbol = symbol_get(FUNCTION); \
 414                 if(! FUNCTION ## _symbol) \
 415                 { \
 416                         printk("gator: mali online " #FUNCTION " symbol not found\n"); \
 417                         (ERROR_COUNT)++; \
 418                 } \
 419         }
 420
 421 #define SYMBOL_CLEANUP(FUNCTION) \
 422         if(FUNCTION ## _symbol) \
 423         { \
 424         symbol_put(FUNCTION); \
 425         FUNCTION ## _symbol = NULL; \
 426         }
 427
 428 /**
 429  * Execute symbol_get for all the Mali symbols and check for success.
 430  * @return the number of symbols not loaded.
 431  */
 432 static int init_symbols(void)
 433 {
 434         int error_count = 0;
 435         SYMBOL_GET(kbase_find_device, error_count);
 436         SYMBOL_GET(kbase_create_context, error_count);
 437         SYMBOL_GET(kbase_va_alloc, error_count);
 438         SYMBOL_GET(kbase_instr_hwcnt_enable, error_count);
 439         SYMBOL_GET(kbase_instr_hwcnt_clear, error_count);
 440         SYMBOL_GET(kbase_instr_hwcnt_dump_irq, error_count);
 441         SYMBOL_GET(kbase_instr_hwcnt_dump_complete, error_count);
 442         SYMBOL_GET(kbase_instr_hwcnt_disable, error_count);
 443         SYMBOL_GET(kbase_va_free, error_count);
 444         SYMBOL_GET(kbase_destroy_context, error_count);
 445
 446         return error_count;
 447 }
 448
 449 /**
 450  * Execute symbol_put for all the registered Mali symbols.
 451  */
 452 static void clean_symbols(void)
 453 {
 454         SYMBOL_CLEANUP(kbase_find_device);
 455         SYMBOL_CLEANUP(kbase_create_context);
 456         SYMBOL_CLEANUP(kbase_va_alloc);
 457         SYMBOL_CLEANUP(kbase_instr_hwcnt_enable);
 458         SYMBOL_CLEANUP(kbase_instr_hwcnt_clear);
 459         SYMBOL_CLEANUP(kbase_instr_hwcnt_dump_irq);
 460         SYMBOL_CLEANUP(kbase_instr_hwcnt_dump_complete);
 461         SYMBOL_CLEANUP(kbase_instr_hwcnt_disable);
 462         SYMBOL_CLEANUP(kbase_va_free);
 463         SYMBOL_CLEANUP(kbase_destroy_context);
 464 }
 465
 466 /**
 467  * Determines whether a read should take place
 468  * @param current_time The current time, obtained from getnstimeofday()
 469  * @param prev_time_s The number of seconds at the previous read attempt.
 470  * @param next_read_time_ns The time (in ns) when the next read should be allowed.
 471  *
 472  * Note that this function has been separated out here to allow it to be tested.
 473  */
 474 static int is_read_scheduled(const struct timespec *current_time, u32 *prev_time_s, s32 *next_read_time_ns)
 475 {
 476         /* If the current ns count rolls over a second, roll the next read time too. */
 477         if (current_time->tv_sec != *prev_time_s) {
 478                 *next_read_time_ns = *next_read_time_ns - NSEC_PER_SEC;
 479         }
 480
 481         /* Abort the read if the next read time has not arrived. */
 482         if (current_time->tv_nsec < *next_read_time_ns) {
 483                 return 0;
 484         }
 485
 486         /* Set the next read some fixed time after this one, and update the read timestamp. */
 487         *next_read_time_ns = current_time->tv_nsec + READ_INTERVAL_NSEC;
 488
 489         *prev_time_s = current_time->tv_sec;
 490         return 1;
 491 }
 492
 493 static int start(void)
 494 {
 495         kbase_uk_hwcnt_setup setup;
 496         mali_error err;
 497         int cnt;
 498         u16 bitmask[] = { 0, 0, 0, 0 };
 499
 500         /* Setup HW counters */
 501         num_hardware_counters_enabled = 0;
 502
 503         if (NUMBER_OF_HARDWARE_COUNTERS != 256) {
 504                 pr_debug("Unexpected number of hardware counters defined: expecting 256, got %d\n", NUMBER_OF_HARDWARE_COUNTERS);
 505         }
 506
 507         /* Calculate enable bitmasks based on counters_enabled array */
 508         for (cnt = 0; cnt < NUMBER_OF_HARDWARE_COUNTERS; cnt++) {
 509                 const mali_counter *counter = &counters[cnt];
 510                 if (counter->enabled) {
 511                         int block = GET_HW_BLOCK(cnt);
 512                         int enable_bit = GET_COUNTER_OFFSET(cnt) / 4;
 513                         bitmask[block] |= (1 << enable_bit);
 514                         pr_debug("gator: Mali-T6xx: hardware counter %s selected [%d]\n", hardware_counter_names[cnt], cnt);
 515                         num_hardware_counters_enabled++;
 516                 }
 517         }
 518
 519         /* Create a kbase context for HW counters */
 520         if (num_hardware_counters_enabled > 0) {
 521                 if (init_symbols() > 0) {
 522                         clean_symbols();
 523                         /* No Mali driver code entrypoints found - not a fault. */
 524                         return 0;
 525                 }
 526
 527                 kbdevice = kbase_find_device_symbol(-1);
 528
 529                 /* If we already got a context, fail */
 530                 if (kbcontext) {
 531                         pr_debug("gator: Mali-T6xx: error context already present\n");
 532                         goto out;
 533                 }
 534
 535                 /* kbcontext will only be valid after all the Mali symbols are loaded successfully */
 536                 kbcontext = kbase_create_context_symbol(kbdevice);
 537                 if (!kbcontext) {
 538                         pr_debug("gator: Mali-T6xx: error creating kbase context\n");
 539                         goto out;
 540                 }
 541
 542                 /*
 543                  * The amount of memory needed to store the dump (bytes)
 544                  * DUMP_SIZE = number of core groups
 545                  *             * number of blocks (always 8 for midgard)
 546                  *             * number of counters per block (always 64 for midgard)
 547                  *             * number of bytes per counter (always 4 in midgard)
 548                  * For a Mali-T6xx with a single core group = 1 * 8 * 64 * 4 = 2048
 549                  * For a Mali-T6xx with a dual core group   = 2 * 8 * 64 * 4 = 4096
 550                  */
 551 #if MALI_DDK_GATOR_API_VERSION == 1
 552                 kernel_dump_buffer = kbase_va_alloc_symbol(kbcontext, 4096);
 553 #elif MALI_DDK_GATOR_API_VERSION == 2
 554                 kernel_dump_buffer = kbase_va_alloc_symbol(kbcontext, 4096, &kernel_dump_buffer_handle);
 555 #endif
 556                 if (!kernel_dump_buffer) {
 557                         pr_debug("gator: Mali-T6xx: error trying to allocate va\n");
 558                         goto destroy_context;
 559                 }
 560
 561                 setup.dump_buffer = (uintptr_t)kernel_dump_buffer;
 562                 setup.jm_bm = bitmask[JM_BLOCK];
 563                 setup.tiler_bm = bitmask[TILER_BLOCK];
 564                 setup.shader_bm = bitmask[SHADER_BLOCK];
 565                 setup.mmu_l2_bm = bitmask[MMU_BLOCK];
 566                 /* These counters do not exist on Mali-T60x */
 567                 setup.l3_cache_bm = 0;
 568
 569                 /* Use kbase API to enable hardware counters and provide dump buffer */
 570                 err = kbase_instr_hwcnt_enable_symbol(kbcontext, &setup);
 571                 if (err != MALI_ERROR_NONE) {
 572                         pr_debug("gator: Mali-T6xx: can't setup hardware counters\n");
 573                         goto free_buffer;
 574                 }
 575                 pr_debug("gator: Mali-T6xx: hardware counters enabled\n");
 576                 kbase_instr_hwcnt_clear_symbol(kbcontext);
 577                 pr_debug("gator: Mali-T6xx: hardware counters cleared \n");
 578
 579                 kbase_device_busy = false;
 580         }
 581
 582         return 0;
 583
 584 free_buffer:
 585 #if MALI_DDK_GATOR_API_VERSION == 1
 586         kbase_va_free_symbol(kbcontext, kernel_dump_buffer);
 587 #elif MALI_DDK_GATOR_API_VERSION == 2
 588         kbase_va_free_symbol(kbcontext, &kernel_dump_buffer_handle);
 589 #endif
 590
 591 destroy_context:
 592         kbase_destroy_context_symbol(kbcontext);
 593
 594 out:
 595         clean_symbols();
 596         return -1;
 597 }
 598
 599 static void stop(void)
 600 {
 601         unsigned int cnt;
 602         kbase_context *temp_kbcontext;
 603
 604         pr_debug("gator: Mali-T6xx: stop\n");
 605
 606         /* Set all counters as disabled */
 607         for (cnt = 0; cnt < NUMBER_OF_HARDWARE_COUNTERS; cnt++) {
 608                 counters[cnt].enabled = 0;
 609         }
 610
 611         /* Destroy the context for HW counters */
 612         if (num_hardware_counters_enabled > 0 && kbcontext != NULL) {
 613                 /*
 614                  * Set the global variable to NULL before destroying it, because
 615                  * other function will check this before using it.
 616                  */
 617                 temp_kbcontext = kbcontext;
 618                 kbcontext = NULL;
 619
 620                 kbase_instr_hwcnt_disable_symbol(temp_kbcontext);
 621
 622 #if MALI_DDK_GATOR_API_VERSION == 1
 623                 kbase_va_free_symbol(temp_kbcontext, kernel_dump_buffer);
 624 #elif MALI_DDK_GATOR_API_VERSION == 2
 625                 kbase_va_free_symbol(temp_kbcontext, &kernel_dump_buffer_handle);
 626 #endif
 627
 628                 kbase_destroy_context_symbol(temp_kbcontext);
 629
 630                 pr_debug("gator: Mali-T6xx: hardware counters stopped\n");
 631
 632                 clean_symbols();
 633         }
 634 }
 635
 636 static int read(int **buffer)
 637 {
 638         int cnt;
 639         int len = 0;
 640         u32 value = 0;
 641         mali_bool success;
 642
 643         struct timespec current_time;
 644         static u32 prev_time_s = 0;
 645         static s32 next_read_time_ns = 0;
 646
 647         if (!on_primary_core()) {
 648                 return 0;
 649         }
 650
 651         getnstimeofday(&current_time);
 652
 653         /*
 654          * Discard reads unless a respectable time has passed.  This reduces the load on the GPU without sacrificing
 655          * accuracy on the Streamline display.
 656          */
 657         if (!is_read_scheduled(&current_time, &prev_time_s, &next_read_time_ns)) {
 658                 return 0;
 659         }
 660
 661         /*
 662          * Report the HW counters
 663          * Only process hardware counters if at least one of the hardware counters is enabled.
 664          */
 665         if (num_hardware_counters_enabled > 0) {
 666                 const unsigned int vithar_blocks[] = {
 667                         0x700,  /* VITHAR_JOB_MANAGER,     Block 0 */
 668                         0x400,  /* VITHAR_TILER,           Block 1 */
 669                         0x000,  /* VITHAR_SHADER_CORE,     Block 2 */
 670                         0x500   /* VITHAR_MEMORY_SYSTEM,   Block 3 */
 671                 };
 672
 673                 if (!kbcontext) {
 674                         return -1;
 675                 }
 676
 677                 /* Mali symbols can be called safely since a kbcontext is valid */
 678                 if (kbase_instr_hwcnt_dump_complete_symbol(kbcontext, &success) == MALI_TRUE) {
 679                         kbase_device_busy = false;
 680
 681                         if (success == MALI_TRUE) {
 682                                 for (cnt = 0; cnt < NUMBER_OF_HARDWARE_COUNTERS; cnt++) {
 683                                         const mali_counter *counter = &counters[cnt];
 684                                         if (counter->enabled) {
 685                                                 const int block = GET_HW_BLOCK(cnt);
 686                                                 const int counter_offset = GET_COUNTER_OFFSET(cnt);
 687                                                 const u32 *counter_block = (u32 *) ((uintptr_t)kernel_dump_buffer + vithar_blocks[block]);
 688                                                 const u32 *counter_address = counter_block + counter_offset;
 689
 690                                                 value = *counter_address;
 691
 692                                                 if (block == SHADER_BLOCK) {
 693                                                         /* (counter_address + 0x000) has already been accounted-for above. */
 694                                                         value += *(counter_address + 0x100);
 695                                                         value += *(counter_address + 0x200);
 696                                                         value += *(counter_address + 0x300);
 697                                                 }
 698
 699                                                 counter_dump[len++] = counter->key;
 700                                                 counter_dump[len++] = value;
 701                                         }
 702                                 }
 703                         }
 704                 }
 705
 706                 if (!kbase_device_busy) {
 707                         kbase_device_busy = true;
 708                         kbase_instr_hwcnt_dump_irq_symbol(kbcontext);
 709                 }
 710         }
 711
 712         /* Update the buffer */
 713         if (buffer) {
 714                 *buffer = (int *)counter_dump;
 715         }
 716
 717         return len;
 718 }
 719
 720 static int create_files(struct super_block *sb, struct dentry *root)
 721 {
 722         unsigned int event;
 723         /*
 724          * Create the filesystem for all events
 725          */
 726         int counter_index = 0;
 727         const char *mali_name = gator_mali_get_mali_name();
 728
 729         for (event = 0; event < NUMBER_OF_HARDWARE_COUNTERS; event++) {
 730                 if (gator_mali_create_file_system(mali_name, hardware_counter_names[counter_index], sb, root, &counters[event]) != 0)
 731                         return -1;
 732                 counter_index++;
 733         }
 734
 735         return 0;
 736 }
 737
 738 static struct gator_interface gator_events_mali_t6xx_interface = {
 739         .create_files = create_files,
 740         .start = start,
 741         .stop = stop,
 742         .read = read
 743 };
 744
 745 int gator_events_mali_t6xx_hw_init(void)
 746 {
 747         pr_debug("gator: Mali-T6xx: sw_counters init\n");
 748
 749 #if GATOR_TEST
 750         test_all_is_read_scheduled();
 751 #endif
 752
 753         gator_mali_initialise_counters(counters, NUMBER_OF_HARDWARE_COUNTERS);
 754
 755         return gator_events_install(&gator_events_mali_t6xx_interface);
 756 }
 757
 758 gator_events_init(gator_events_mali_t6xx_hw_init);