drivers/staging/csr/csr_wifi_hip_dump.c

   1 /*****************************************************************************
   2
   3             (c) Cambridge Silicon Radio Limited 2012
   4             All rights reserved and confidential information of CSR
   5
   6             Refer to LICENSE.txt included with this source for details
   7             on the license terms.
   8
   9 *****************************************************************************/
  10
  11 /*
  12  * ---------------------------------------------------------------------------
  13  * FILE: csr_wifi_hip_dump.c
  14  *
  15  * PURPOSE:
  16  *      Routines for retrieving and buffering core status from the UniFi
  17  *
  18  * ---------------------------------------------------------------------------
  19  */
  20 #include <linux/slab.h>
  21 #include "csr_wifi_hip_unifi.h"
  22 #include "csr_wifi_hip_unifiversion.h"
  23 #include "csr_wifi_hip_card.h"
  24
  25 /* Locations to capture in dump (XAP words) */
  26 #define HIP_CDUMP_FIRST_CPUREG      (0xFFE0) /* First CPU register */
  27 #define HIP_CDUMP_FIRST_LO          (0)      /* Start of low address range */
  28 #define HIP_CDUMP_FIRST_HI_MAC      (0x3C00) /* Start of MAC high area */
  29 #define HIP_CDUMP_FIRST_HI_PHY      (0x1C00) /* Start of PHY high area */
  30 #define HIP_CDUMP_FIRST_SH          (0)      /* Start of shared memory area */
  31
  32 #define HIP_CDUMP_NCPUREGS    (10)           /* No. of 16-bit XAP registers */
  33 #define HIP_CDUMP_NWORDS_LO   (0x0100)       /* Low area size in 16-bit words */
  34 #define HIP_CDUMP_NWORDS_HI   (0x0400)       /* High area size in 16-bit words */
  35 #define HIP_CDUMP_NWORDS_SH   (0x0500)       /* Shared memory area size, 16-bit words */
  36
  37 #define HIP_CDUMP_NUM_ZONES 7                /* Number of UniFi memory areas to capture */
  38
  39 /* Mini-coredump state */
  40 typedef struct coredump_buf
  41 {
  42     u16  count;                       /* serial number of dump */
  43     u32  timestamp;                   /* host's system time at capture */
  44     s16   requestor;                   /* request: 0=auto dump, 1=manual */
  45     u16  chip_ver;
  46     u32  fw_ver;
  47     u16 *zone[HIP_CDUMP_NUM_ZONES];
  48
  49     struct coredump_buf *next;              /* circular list */
  50     struct coredump_buf *prev;              /* circular list */
  51 } coredump_buffer;
  52
  53 /* Structure used to describe a zone of chip memory captured by mini-coredump */
  54 struct coredump_zone
  55 {
  56     unifi_coredump_space_t           space;  /* XAP memory space this zone covers */
  57     enum unifi_dbg_processors_select cpu;    /* XAP CPU core selector */
  58     u32                        gp;     /* Generic Pointer to memory zone on XAP */
  59     u16                        offset; /* 16-bit XAP word offset of zone in memory space */
  60     u16                        length; /* Length of zone in XAP words */
  61 };
  62
  63 static CsrResult unifi_coredump_from_sdio(card_t *card, coredump_buffer *dump_buf);
  64 static CsrResult unifi_coredump_read_zones(card_t *card, coredump_buffer *dump_buf);
  65 static CsrResult unifi_coredump_read_zone(card_t *card, u16 *zone,
  66                                           const struct coredump_zone *def);
  67 static s32 get_value_from_coredump(const coredump_buffer *dump,
  68                                         const unifi_coredump_space_t space, const u16 offset);
  69
  70 /* Table of chip memory zones we capture on mini-coredump */
  71 static const struct coredump_zone zonedef_table[HIP_CDUMP_NUM_ZONES] = {
  72     { UNIFI_COREDUMP_MAC_REG,  UNIFI_PROC_MAC, UNIFI_MAKE_GP(REGISTERS, HIP_CDUMP_FIRST_CPUREG * 2), HIP_CDUMP_FIRST_CPUREG, HIP_CDUMP_NCPUREGS },
  73     { UNIFI_COREDUMP_PHY_REG,  UNIFI_PROC_PHY, UNIFI_MAKE_GP(REGISTERS, HIP_CDUMP_FIRST_CPUREG * 2), HIP_CDUMP_FIRST_CPUREG, HIP_CDUMP_NCPUREGS },
  74     { UNIFI_COREDUMP_SH_DMEM,  UNIFI_PROC_INVALID, UNIFI_MAKE_GP(SH_DMEM, HIP_CDUMP_FIRST_SH * 2),   HIP_CDUMP_FIRST_SH,     HIP_CDUMP_NWORDS_SH },
  75     { UNIFI_COREDUMP_MAC_DMEM, UNIFI_PROC_MAC, UNIFI_MAKE_GP(MAC_DMEM, HIP_CDUMP_FIRST_LO * 2),      HIP_CDUMP_FIRST_LO,     HIP_CDUMP_NWORDS_LO },
  76     { UNIFI_COREDUMP_MAC_DMEM, UNIFI_PROC_MAC, UNIFI_MAKE_GP(MAC_DMEM, HIP_CDUMP_FIRST_HI_MAC * 2),  HIP_CDUMP_FIRST_HI_MAC, HIP_CDUMP_NWORDS_HI },
  77     { UNIFI_COREDUMP_PHY_DMEM, UNIFI_PROC_PHY, UNIFI_MAKE_GP(PHY_DMEM, HIP_CDUMP_FIRST_LO * 2),      HIP_CDUMP_FIRST_LO,     HIP_CDUMP_NWORDS_LO },
  78     { UNIFI_COREDUMP_PHY_DMEM, UNIFI_PROC_PHY, UNIFI_MAKE_GP(PHY_DMEM, HIP_CDUMP_FIRST_HI_PHY * 2),  HIP_CDUMP_FIRST_HI_PHY, HIP_CDUMP_NWORDS_HI },
  79 };
  80
  81 /*
  82  * ---------------------------------------------------------------------------
  83  *  unifi_coredump_request_at_next_reset
  84  *
  85  *      Request that a mini-coredump is performed when the driver has
  86  *      completed resetting the UniFi device.
  87  *
  88  *  Arguments:
  89  *      card            Pointer to card struct
  90  *      enable          If non-zero, sets the request.
  91  *                      If zero, cancels any pending request.
  92  *
  93  *  Returns:
  94  *      CSR_RESULT_SUCCESS or CSR HIP error code
  95  *
  96  *  Notes:
  97  *      This function is typically called once the driver has detected that
  98  *      the UniFi device has become unresponsive due to crash, or internal
  99  *      watchdog reset. The driver must reset it to regain communication and,
 100  *      immediately after that, the mini-coredump can be captured.
 101  * ---------------------------------------------------------------------------
 102  */
 103 CsrResult unifi_coredump_request_at_next_reset(card_t *card, s8 enable)
 104 {
 105     CsrResult r;
 106
 107     if (enable)
 108     {
 109         unifi_trace(card->ospriv, UDBG2, "Mini-coredump requested after reset\n");
 110     }
 111
 112     if (card == NULL)
 113     {
 114         r = CSR_WIFI_HIP_RESULT_INVALID_VALUE;
 115     }
 116     else
 117     {
 118         card->request_coredump_on_reset = enable?1 : 0;
 119         r = CSR_RESULT_SUCCESS;
 120     }
 121
 122     return r;
 123 }
 124
 125
 126 /*
 127  * ---------------------------------------------------------------------------
 128  *  unifi_coredump_handle_request
 129  *
 130  *      Performs a coredump now, if one was requested, and clears the request.
 131  *
 132  *  Arguments:
 133  *      card            Pointer to card struct
 134  *
 135  *  Returns:
 136  *      CSR_RESULT_SUCCESS or CSR HIP error code
 137  *
 138  *  Notes:
 139  * ---------------------------------------------------------------------------
 140  */
 141 CsrResult unifi_coredump_handle_request(card_t *card)
 142 {
 143     CsrResult r = CSR_RESULT_SUCCESS;
 144
 145     if (card == NULL)
 146     {
 147         r = CSR_WIFI_HIP_RESULT_INVALID_VALUE;
 148     }
 149     else
 150     {
 151         if (card->request_coredump_on_reset == 1)
 152         {
 153             card->request_coredump_on_reset = 0;
 154             r = unifi_coredump_capture(card, NULL);
 155         }
 156     }
 157
 158     return r;
 159 }
 160
 161
 162 /*
 163  * ---------------------------------------------------------------------------
 164  *  unifi_coredump_capture
 165  *
 166  *      Capture the current status of the UniFi device.
 167  *      Various registers are buffered for future offline inspection.
 168  *
 169  *  Arguments:
 170  *      card            Pointer to card struct
 171  *      req             Pointer to request struct, or NULL:
 172  *                          A coredump requested manually by the user app
 173  *                          will have a request struct pointer, an automatic
 174  *                          coredump will have a NULL pointer.
 175  *  Returns:
 176  *      CSR_RESULT_SUCCESS  on success,
 177  *      CSR_RESULT_FAILURE  SDIO error
 178  *      CSR_WIFI_HIP_RESULT_INVALID_VALUE  Initialisation not complete
 179  *
 180  *  Notes:
 181  *      The result is a filled entry in the circular buffer of core dumps,
 182  *      values from which can be extracted to userland via an ioctl.
 183  * ---------------------------------------------------------------------------
 184  */
 185 CsrResult unifi_coredump_capture(card_t *card, struct unifi_coredump_req *req)
 186 {
 187     CsrResult r = CSR_RESULT_SUCCESS;
 188     static u16 dump_seq_no = 1;
 189     u32 time_of_capture;
 190
 191     if (card->dump_next_write == NULL)
 192     {
 193         r = CSR_RESULT_SUCCESS;
 194         goto done;
 195     }
 196
 197     /* Reject forced capture before initialisation has happened */
 198     if (card->helper == NULL)
 199     {
 200         r = CSR_WIFI_HIP_RESULT_INVALID_VALUE;
 201         goto done;
 202     }
 203
 204
 205     /*
 206      * Force a mini-coredump capture right now
 207      */
 208     time_of_capture = CsrTimeGet(NULL);
 209     unifi_info(card->ospriv, "Mini-coredump capture at t=%u\n", time_of_capture);
 210
 211     /* Wake up the processors so we can talk to them */
 212     r = unifi_set_host_state(card, UNIFI_HOST_STATE_AWAKE);
 213     if (r != CSR_RESULT_SUCCESS)
 214     {
 215         unifi_error(card->ospriv, "Failed to wake UniFi\n");
 216         goto done;
 217     }
 218     CsrThreadSleep(20);
 219
 220     /* Stop both XAPs */
 221     unifi_trace(card->ospriv, UDBG4, "Stopping XAPs for coredump capture\n");
 222     r = unifi_card_stop_processor(card, UNIFI_PROC_BOTH);
 223     if (r != CSR_RESULT_SUCCESS)
 224     {
 225         unifi_error(card->ospriv, "Failed to stop UniFi XAPs\n");
 226         goto done;
 227     }
 228
 229     /* Dump core into the next available slot in the circular list */
 230     r = unifi_coredump_from_sdio(card, card->dump_next_write);
 231     if (r == CSR_RESULT_SUCCESS)
 232     {
 233         /* Record whether the dump was manual or automatic */
 234         card->dump_next_write->requestor = (req?1 : 0);
 235         card->dump_next_write->timestamp = time_of_capture;
 236         /* Advance to the next buffer */
 237         card->dump_next_write->count = dump_seq_no++;
 238         card->dump_cur_read = card->dump_next_write;
 239         card->dump_next_write = card->dump_next_write->next;
 240
 241         /* Sequence no. of zero indicates slot not in use, so handle wrap */
 242         if (dump_seq_no == 0)
 243         {
 244             dump_seq_no = 1;
 245         }
 246
 247         unifi_trace(card->ospriv, UDBG3,
 248                     "Coredump (%p), SeqNo=%d, cur_read=%p, next_write=%p\n",
 249                     req,
 250                     card->dump_cur_read->count,
 251                     card->dump_cur_read, card->dump_next_write);
 252     }
 253
 254     /* Start both XAPs */
 255     unifi_trace(card->ospriv, UDBG4, "Restart XAPs after coredump\n");
 256     r = card_start_processor(card, UNIFI_PROC_BOTH);
 257     if (r != CSR_RESULT_SUCCESS)
 258     {
 259         unifi_error(card->ospriv, "Failed to start UniFi XAPs\n");
 260         goto done;
 261     }
 262
 263 done:
 264     return r;
 265 } /* unifi_coredump_capture() */
 266
 267
 268 /*
 269  * ---------------------------------------------------------------------------
 270  *  get_value_from_coredump
 271  *
 272  *
 273  *
 274  *  Arguments:
 275  *      dump                Pointer to buffered coredump data
 276  *      offset_in_space     XAP memory space to retrieve from the buffer (there
 277  *                          may be more than one zone covering the same memory
 278  *                          space, but starting from different offsets).
 279  *      offset              Offset within the XAP memory space to be retrieved
 280  *
 281  *  Returns:
 282  *      >=0                  Register value on success
 283  *      <0                   Register out of range of any captured zones
 284  *
 285  *  Notes:
 286  * ---------------------------------------------------------------------------
 287  */
 288 static s32 get_value_from_coredump(const coredump_buffer       *coreDump,
 289                                         const unifi_coredump_space_t space,
 290                                         const u16              offset_in_space)
 291 {
 292     s32 r = -1;
 293     u16 offset_in_zone;
 294     u32 zone_end_offset;
 295     s32 i;
 296     const struct coredump_zone *def = &zonedef_table[0];
 297
 298     /* Search zone def table for a match with the requested memory space */
 299     for (i = 0; i < HIP_CDUMP_NUM_ZONES; i++, def++)
 300     {
 301         if (space == def->space)
 302         {
 303             zone_end_offset = def->offset + def->length;
 304
 305             /* Is the space offset contained in this zone? */
 306             if (offset_in_space < zone_end_offset &&
 307                 offset_in_space >= def->offset)
 308             {
 309                 /* Calculate the offset of data within the zone buffer */
 310                 offset_in_zone = offset_in_space - def->offset;
 311                 r = (s32) * (coreDump->zone[i] + offset_in_zone);
 312
 313                 unifi_trace(NULL, UDBG6,
 314                             "sp %d, offs 0x%04x = 0x%04x (in z%d 0x%04x->0x%04x)\n",
 315                             space, offset_in_space, r,
 316                             i, def->offset, zone_end_offset - 1);
 317                 break;
 318             }
 319         }
 320     }
 321     return r;
 322 }
 323
 324
 325 /*
 326  * ---------------------------------------------------------------------------
 327  *  unifi_coredump_get_value
 328  *
 329  *      Retrieve the value of a register buffered from a previous core dump,
 330  *      so that it may be reported back to application code.
 331  *
 332  *  Arguments:
 333  *      card            Pointer to card struct
 334  *      req_reg         Pointer to request parameter partially filled. This
 335  *                      function puts in the values retrieved from the dump.
 336  *
 337  *  Returns:
 338  *      CSR_RESULT_SUCCESS on success, or:
 339  *      CSR_WIFI_HIP_RESULT_INVALID_VALUE         Null parameter error
 340  *      CSR_WIFI_HIP_RESULT_RANGE                 Register out of range
 341  *      CSR_WIFI_HIP_RESULT_NOT_FOUND             Dump index not (yet) captured
 342  *
 343  *  Notes:
 344  * ---------------------------------------------------------------------------
 345  */
 346 CsrResult unifi_coredump_get_value(card_t *card, struct unifi_coredump_req *req)
 347 {
 348     CsrResult r;
 349     s32 i = 0;
 350     coredump_buffer *find_dump = NULL;
 351
 352     if (req == NULL || card == NULL)
 353     {
 354         r = CSR_WIFI_HIP_RESULT_INVALID_VALUE;
 355         goto done;
 356     }
 357     req->value = -1;
 358     if (card->dump_buf == NULL)
 359     {
 360         unifi_trace(card->ospriv, UDBG2, "No coredump buffers\n");
 361         r = CSR_WIFI_HIP_RESULT_NOT_FOUND;     /* Coredumping disabled */
 362         goto done;
 363     }
 364     if (card->dump_cur_read == NULL)
 365     {
 366         unifi_trace(card->ospriv, UDBG4, "No coredumps captured\n");
 367         r = CSR_WIFI_HIP_RESULT_NOT_FOUND;     /* No coredump yet captured */
 368         goto done;
 369     }
 370
 371     /* Find the requested dump buffer */
 372     switch (req->index)
 373     {
 374         case 0:     /* Newest */
 375             find_dump = card->dump_cur_read;
 376             break;
 377         case -1:    /* Oldest: The next used slot forward */
 378             for (find_dump = card->dump_cur_read->next;
 379                  (find_dump->count == 0) && (find_dump != card->dump_cur_read);
 380                  find_dump = card->dump_cur_read->next)
 381             {
 382             }
 383             break;
 384         default:    /* Number of steps back from current read position */
 385             for (i = 0, find_dump = card->dump_cur_read;
 386                  i < req->index;
 387                  i++, find_dump = find_dump->prev)
 388             {
 389                 /* Walk the list for the index'th entry, but
 390                  * stop when about to wrap. */
 391                 unifi_trace(card->ospriv, UDBG6,
 392                             "%d: %d, @%p, p=%p, n=%p, cr=%p, h=%p\n",
 393                             i, find_dump->count, find_dump, find_dump->prev,
 394                             find_dump->next, card->dump_cur_read, card->dump_buf);
 395                 if (find_dump->prev == card->dump_cur_read)
 396                 {
 397                     /* Wrapped but still not found, index out of range */
 398                     if (i != req->index)
 399                     {
 400                         unifi_trace(card->ospriv, UDBG6,
 401                                     "Dump index %d not found %d\n", req->index, i);
 402                         r = CSR_WIFI_HIP_RESULT_NOT_FOUND;
 403                         goto done;
 404                     }
 405                     break;
 406                 }
 407             }
 408             break;
 409     }
 410
 411     /* Check if the slot is actually filled with a core dump */
 412     if (find_dump->count == 0)
 413     {
 414         unifi_trace(card->ospriv, UDBG4, "Not captured %d\n", req->index);
 415         r = CSR_WIFI_HIP_RESULT_NOT_FOUND;
 416         goto done;
 417     }
 418
 419     unifi_trace(card->ospriv, UDBG6, "Req index %d, found seq %d at step %d\n",
 420                 req->index, find_dump->count, i);
 421
 422     /* Find the appropriate entry in the buffer */
 423     req->value = get_value_from_coredump(find_dump, req->space, (u16)req->offset);
 424     if (req->value < 0)
 425     {
 426         r = CSR_WIFI_HIP_RESULT_RANGE;     /* Un-captured register */
 427         unifi_trace(card->ospriv, UDBG4,
 428                     "Can't read space %d, reg 0x%x from coredump buffer %d\n",
 429                     req->space, req->offset, req->index);
 430     }
 431     else
 432     {
 433         r = CSR_RESULT_SUCCESS;
 434     }
 435
 436     /* Update the private request structure with the found values */
 437     req->chip_ver = find_dump->chip_ver;
 438     req->fw_ver = find_dump->fw_ver;
 439     req->timestamp = find_dump->timestamp;
 440     req->requestor = find_dump->requestor;
 441     req->serial = find_dump->count;
 442
 443 done:
 444     return r;
 445 } /* unifi_coredump_get_value() */
 446
 447
 448 /*
 449  * ---------------------------------------------------------------------------
 450  *  unifi_coredump_read_zone
 451  *
 452  *      Captures a UniFi memory zone into a buffer on the host
 453  *
 454  *  Arguments:
 455  *      card          Pointer to card struct
 456  *      zonebuf       Pointer to on-host buffer to dump the memory zone into
 457  *      def           Pointer to description of the memory zone to read from UniFi.
 458  *
 459  *  Returns:
 460  *      CSR_RESULT_SUCCESS                   on success, or:
 461  *      CSR_RESULT_FAILURE                   SDIO error
 462  *      CSR_WIFI_HIP_RESULT_INVALID_VALUE         Parameter error
 463  *
 464  *  Notes:
 465  *      It is assumed that the caller has already stopped the XAPs
 466  * ---------------------------------------------------------------------------
 467  */
 468 static CsrResult unifi_coredump_read_zone(card_t *card, u16 *zonebuf, const struct coredump_zone *def)
 469 {
 470     CsrResult r;
 471
 472     if (zonebuf == NULL || def == NULL)
 473     {
 474         r = CSR_WIFI_HIP_RESULT_INVALID_VALUE;
 475         goto done;
 476     }
 477
 478     /* Select XAP CPU if necessary */
 479     if (def->cpu != UNIFI_PROC_INVALID)
 480     {
 481         if (def->cpu != UNIFI_PROC_MAC && def->cpu != UNIFI_PROC_PHY)
 482         {
 483             r = CSR_WIFI_HIP_RESULT_INVALID_VALUE;
 484             goto done;
 485         }
 486         r = unifi_set_proc_select(card, def->cpu);
 487         if (r != CSR_RESULT_SUCCESS)
 488         {
 489             goto done;
 490         }
 491     }
 492
 493     unifi_trace(card->ospriv, UDBG4,
 494                 "Dump sp %d, offs 0x%04x, 0x%04x words @GP=%08x CPU %d\n",
 495                 def->space, def->offset, def->length, def->gp, def->cpu);
 496
 497     /* Read on-chip RAM (byte-wise) */
 498     r = unifi_card_readn(card, def->gp, zonebuf, (u16)(def->length * 2));
 499     if (r == CSR_WIFI_HIP_RESULT_NO_DEVICE)
 500     {
 501         goto done;
 502     }
 503     if (r != CSR_RESULT_SUCCESS)
 504     {
 505         unifi_error(card->ospriv, "Can't read UniFi shared data area\n");
 506         goto done;
 507     }
 508
 509 done:
 510     return r;
 511 }
 512
 513
 514 /*
 515  * ---------------------------------------------------------------------------
 516  *  unifi_coredump_read_zones
 517  *
 518  *      Walks through the table of on-chip memory zones defined in zonedef_table,
 519  *      and reads each of them from the UniFi chip
 520  *
 521  *  Arguments:
 522  *      card          Pointer to card struct
 523  *      dump_buf      Buffer into which register values will be dumped
 524  *
 525  *  Returns:
 526  *      CSR_RESULT_SUCCESS                   on success, or:
 527  *      CSR_RESULT_FAILURE                   SDIO error
 528  *      CSR_WIFI_HIP_RESULT_INVALID_VALUE         Parameter error
 529  *
 530  *  Notes:
 531  *      It is assumed that the caller has already stopped the XAPs
 532  * ---------------------------------------------------------------------------
 533  */
 534 static CsrResult unifi_coredump_read_zones(card_t *card, coredump_buffer *dump_buf)
 535 {
 536     CsrResult r = CSR_RESULT_SUCCESS;
 537     s32 i;
 538
 539     /* Walk the table of coredump zone definitions and read them from the chip */
 540     for (i = 0;
 541          (i < HIP_CDUMP_NUM_ZONES) && (r == 0);
 542          i++)
 543     {
 544         r = unifi_coredump_read_zone(card, dump_buf->zone[i], &zonedef_table[i]);
 545     }
 546
 547     return r;
 548 }
 549
 550
 551 /*
 552  * ---------------------------------------------------------------------------
 553  *  unifi_coredump_from_sdio
 554  *
 555  *      Capture the status of the UniFi processors, over SDIO
 556  *
 557  *  Arguments:
 558  *      card            Pointer to card struct
 559  *      reg_buffer      Buffer into which register values will be dumped
 560  *
 561  *  Returns:
 562  *      CSR_RESULT_SUCCESS                   on success, or:
 563  *      CSR_RESULT_FAILURE                   SDIO error
 564  *      CSR_WIFI_HIP_RESULT_INVALID_VALUE         Parameter error
 565  *
 566  *  Notes:
 567  * ---------------------------------------------------------------------------
 568  */
 569 static CsrResult unifi_coredump_from_sdio(card_t *card, coredump_buffer *dump_buf)
 570 {
 571     u16 val;
 572     CsrResult r;
 573     u32 sdio_addr;
 574
 575     if (dump_buf == NULL)
 576     {
 577         r = CSR_WIFI_HIP_RESULT_INVALID_VALUE;
 578         goto done;
 579     }
 580
 581
 582     /* Chip and firmware version */
 583     unifi_trace(card->ospriv, UDBG4, "Get chip version\n");
 584     sdio_addr = 2 * ChipHelper_GBL_CHIP_VERSION(card->helper);
 585     if (sdio_addr != 0)
 586     {
 587         r = unifi_read_direct16(card, sdio_addr, &val);
 588         if (r == CSR_WIFI_HIP_RESULT_NO_DEVICE)
 589         {
 590             goto done;
 591         }
 592         if (r != CSR_RESULT_SUCCESS)
 593         {
 594             unifi_error(card->ospriv, "Can't read GBL_CHIP_VERSION\n");
 595             goto done;
 596         }
 597     }
 598     dump_buf->chip_ver = val;
 599     dump_buf->fw_ver = card->build_id;
 600
 601     unifi_trace(card->ospriv, UDBG4, "chip_ver 0x%04x, fw_ver %u\n",
 602                 dump_buf->chip_ver, dump_buf->fw_ver);
 603
 604     /* Capture the memory zones required from UniFi */
 605     r = unifi_coredump_read_zones(card, dump_buf);
 606     if (r == CSR_WIFI_HIP_RESULT_NO_DEVICE)
 607     {
 608         goto done;
 609     }
 610     if (r != CSR_RESULT_SUCCESS)
 611     {
 612         unifi_error(card->ospriv, "Can't read UniFi memory areas\n");
 613         goto done;
 614     }
 615
 616 done:
 617     return r;
 618 } /* unifi_coredump_from_sdio() */
 619
 620
 621 #ifndef UNIFI_DISABLE_COREDUMP
 622 /*
 623  * ---------------------------------------------------------------------------
 624  *  new_coredump_node
 625  *
 626  *      Allocates a coredump linked-list node, and links it to the previous.
 627  *
 628  *  Arguments:
 629  *      ospriv          OS context
 630  *      prevnode        Previous node to link into
 631  *
 632  *  Returns:
 633  *      Pointer to valid coredump_buffer on success
 634  *      NULL on memory allocation failure
 635  *
 636  *  Notes:
 637  *      Allocates "all or nothing"
 638  * ---------------------------------------------------------------------------
 639  */
 640 static
 641 coredump_buffer* new_coredump_node(void *ospriv, coredump_buffer *prevnode)
 642 {
 643     coredump_buffer *newnode = NULL;
 644     u16 *newzone = NULL;
 645     s32 i;
 646     u32 zone_size;
 647
 648     /* Allocate node header */
 649     newnode = kzalloc(sizeof(coredump_buffer), GFP_KERNEL);
 650     if (newnode == NULL)
 651     {
 652         return NULL;
 653     }
 654
 655     /* Allocate chip memory zone capture buffers */
 656     for (i = 0; i < HIP_CDUMP_NUM_ZONES; i++)
 657     {
 658         zone_size = sizeof(u16) * zonedef_table[i].length;
 659         newzone = kzalloc(zone_size, GFP_KERNEL);
 660         newnode->zone[i] = newzone;
 661         if (newzone == NULL)
 662         {
 663             unifi_error(ospriv, "Out of memory on coredump zone %d (%d words)\n",
 664                         i, zonedef_table[i].length);
 665             break;
 666         }
 667     }
 668
 669     /* Clean up if any zone alloc failed */
 670     if (newzone == NULL)
 671     {
 672         for (i = 0; newnode->zone[i] != NULL; i++)
 673         {
 674             kfree(newnode->zone[i]);
 675             newnode->zone[i] = NULL;
 676         }
 677     }
 678
 679     /* Link to previous node */
 680     newnode->prev = prevnode;
 681     if (prevnode)
 682     {
 683         prevnode->next = newnode;
 684     }
 685     newnode->next = NULL;
 686
 687     return newnode;
 688 }
 689
 690
 691 #endif /* UNIFI_DISABLE_COREDUMP */
 692
 693 /*
 694  * ---------------------------------------------------------------------------
 695  *  unifi_coredump_init
 696  *
 697  *      Allocates buffers for the automatic SDIO core dump
 698  *
 699  *  Arguments:
 700  *      card                Pointer to card struct
 701  *      num_dump_buffers    Number of buffers to reserve for coredumps
 702  *
 703  *  Returns:
 704  *      CSR_RESULT_SUCCESS               on success, or:
 705  *      CSR_WIFI_HIP_RESULT_NO_MEMORY         memory allocation failed
 706  *
 707  *  Notes:
 708  *      Allocates space in advance, to be used for the last n coredump buffers
 709  *      the intention being that the size is sufficient for at least one dump,
 710  *      probably several.
 711  *      It's probably advisable to have at least 2 coredump buffers to allow
 712  *      one to be enquired with the unifi_coredump tool, while leaving another
 713  *      free for capturing.
 714  * ---------------------------------------------------------------------------
 715  */
 716 CsrResult unifi_coredump_init(card_t *card, u16 num_dump_buffers)
 717 {
 718 #ifndef UNIFI_DISABLE_COREDUMP
 719     void *ospriv = card->ospriv;
 720     coredump_buffer *prev = NULL;
 721     coredump_buffer *newnode = NULL;
 722     u32 i = 0;
 723 #endif
 724
 725     card->request_coredump_on_reset = 0;
 726     card->dump_next_write = NULL;
 727     card->dump_cur_read = NULL;
 728     card->dump_buf = NULL;
 729
 730 #ifndef UNIFI_DISABLE_COREDUMP
 731     unifi_trace(ospriv, UDBG1,
 732                 "Allocate buffers for %d core dumps\n", num_dump_buffers);
 733     if (num_dump_buffers == 0)
 734     {
 735         goto done;
 736     }
 737
 738     /* Root node */
 739     card->dump_buf = new_coredump_node(ospriv, NULL);
 740     if (card->dump_buf == NULL)
 741     {
 742         goto fail;
 743     }
 744     prev = card->dump_buf;
 745     newnode = card->dump_buf;
 746
 747     /* Add each subsequent node at tail */
 748     for (i = 1; i < num_dump_buffers; i++)
 749     {
 750         newnode = new_coredump_node(ospriv, prev);
 751         if (newnode == NULL)
 752         {
 753             goto fail;
 754         }
 755         prev = newnode;
 756     }
 757
 758     /* Link the first and last nodes to make the list circular */
 759     card->dump_buf->prev = newnode;
 760     newnode->next = card->dump_buf;
 761
 762     /* Set initial r/w access pointers */
 763     card->dump_next_write = card->dump_buf;
 764     card->dump_cur_read = NULL;
 765
 766     unifi_trace(ospriv, UDBG2, "Core dump configured (%d dumps max)\n", i);
 767
 768 done:
 769 #endif
 770     return CSR_RESULT_SUCCESS;
 771
 772 #ifndef UNIFI_DISABLE_COREDUMP
 773 fail:
 774     /* Unwind what we allocated so far */
 775     unifi_error(ospriv, "Out of memory allocating core dump node %d\n", i);
 776     unifi_coredump_free(card);
 777     return CSR_WIFI_HIP_RESULT_NO_MEMORY;
 778 #endif
 779 } /* unifi_coreump_init() */
 780
 781
 782 /*
 783  * ---------------------------------------------------------------------------
 784  *  unifi_coredump_free
 785  *
 786  *      Free all memory dynamically allocated for core dump
 787  *
 788  *  Arguments:
 789  *      card            Pointer to card struct
 790  *
 791  *  Returns:
 792  *      None
 793  *
 794  *  Notes:
 795  * ---------------------------------------------------------------------------
 796  */
 797 void unifi_coredump_free(card_t *card)
 798 {
 799     void *ospriv = card->ospriv;
 800     coredump_buffer *node, *del_node;
 801     s16 i = 0;
 802     s16 j;
 803
 804     unifi_trace(ospriv, UDBG2, "Core dump de-configured\n");
 805
 806     if (card->dump_buf == NULL)
 807     {
 808         return;
 809     }
 810
 811     node = card->dump_buf;
 812     do
 813     {
 814         /* Free payload zones */
 815         for (j = 0; j < HIP_CDUMP_NUM_ZONES; j++)
 816         {
 817             kfree(node->zone[j]);
 818             node->zone[j] = NULL;
 819         }
 820
 821         /* Detach */
 822         del_node = node;
 823         node = node->next;
 824
 825         /* Free header */
 826         kfree(del_node);
 827         i++;
 828     } while ((node != NULL) && (node != card->dump_buf));
 829
 830     unifi_trace(ospriv, UDBG3, "Freed %d coredump buffers\n", i);
 831
 832     card->dump_buf = NULL;
 833     card->dump_next_write = NULL;
 834     card->dump_cur_read = NULL;
 835 } /* unifi_coredump_free() */
 836
 837