git.oblomov.eu Git - linux-2.6/blob - drivers/ieee1394/ieee1394_transactions.c

   1 /*
   2  * IEEE 1394 for Linux
   3  *
   4  * Transaction support.
   5  *
   6  * Copyright (C) 1999 Andreas E. Bombe
   7  *
   8  * This code is licensed under the GPL.  See the file COPYING in the root
   9  * directory of the kernel sources for details.
  10  */
  11
  12 #include <linux/sched.h>
  13 #include <linux/bitops.h>
  14 #include <linux/smp_lock.h>
  15 #include <linux/interrupt.h>
  16
  17 #include <asm/errno.h>
  18
  19 #include "ieee1394.h"
  20 #include "ieee1394_types.h"
  21 #include "hosts.h"
  22 #include "ieee1394_core.h"
  23 #include "highlevel.h"
  24 #include "nodemgr.h"
  25
  26
  27 #define PREP_ASYNC_HEAD_ADDRESS(tc) \
  28         packet->tcode = tc; \
  29         packet->header[0] = (packet->node_id << 16) | (packet->tlabel << 10) \
  30                 | (1 << 8) | (tc << 4); \
  31         packet->header[1] = (packet->host->node_id << 16) | (addr >> 32); \
  32         packet->header[2] = addr & 0xffffffff
  33
  34
  35 static void fill_async_readquad(struct hpsb_packet *packet, u64 addr)
  36 {
  37         PREP_ASYNC_HEAD_ADDRESS(TCODE_READQ);
  38         packet->header_size = 12;
  39         packet->data_size = 0;
  40         packet->expect_response = 1;
  41 }
  42
  43 static void fill_async_readblock(struct hpsb_packet *packet, u64 addr, int length)
  44 {
  45         PREP_ASYNC_HEAD_ADDRESS(TCODE_READB);
  46         packet->header[3] = length << 16;
  47         packet->header_size = 16;
  48         packet->data_size = 0;
  49         packet->expect_response = 1;
  50 }
  51
  52 static void fill_async_writequad(struct hpsb_packet *packet, u64 addr, quadlet_t data)
  53 {
  54         PREP_ASYNC_HEAD_ADDRESS(TCODE_WRITEQ);
  55         packet->header[3] = data;
  56         packet->header_size = 16;
  57         packet->data_size = 0;
  58         packet->expect_response = 1;
  59 }
  60
  61 static void fill_async_writeblock(struct hpsb_packet *packet, u64 addr, int length)
  62 {
  63         PREP_ASYNC_HEAD_ADDRESS(TCODE_WRITEB);
  64         packet->header[3] = length << 16;
  65         packet->header_size = 16;
  66         packet->expect_response = 1;
  67         packet->data_size = length + (length % 4 ? 4 - (length % 4) : 0);
  68 }
  69
  70 static void fill_async_lock(struct hpsb_packet *packet, u64 addr, int extcode,
  71                      int length)
  72 {
  73         PREP_ASYNC_HEAD_ADDRESS(TCODE_LOCK_REQUEST);
  74         packet->header[3] = (length << 16) | extcode;
  75         packet->header_size = 16;
  76         packet->data_size = length;
  77         packet->expect_response = 1;
  78 }
  79
  80 static void fill_iso_packet(struct hpsb_packet *packet, int length, int channel,
  81                      int tag, int sync)
  82 {
  83         packet->header[0] = (length << 16) | (tag << 14) | (channel << 8)
  84                 | (TCODE_ISO_DATA << 4) | sync;
  85
  86         packet->header_size = 4;
  87         packet->data_size = length;
  88         packet->type = hpsb_iso;
  89         packet->tcode = TCODE_ISO_DATA;
  90 }
  91
  92 static void fill_phy_packet(struct hpsb_packet *packet, quadlet_t data)
  93 {
  94         packet->header[0] = data;
  95         packet->header[1] = ~data;
  96         packet->header_size = 8;
  97         packet->data_size = 0;
  98         packet->expect_response = 0;
  99         packet->type = hpsb_raw;             /* No CRC added */
 100         packet->speed_code = IEEE1394_SPEED_100; /* Force speed to be 100Mbps */
 101 }
 102
 103 static void fill_async_stream_packet(struct hpsb_packet *packet, int length,
 104                                      int channel, int tag, int sync)
 105 {
 106         packet->header[0] = (length << 16) | (tag << 14) | (channel << 8)
 107                           | (TCODE_STREAM_DATA << 4) | sync;
 108
 109         packet->header_size = 4;
 110         packet->data_size = length;
 111         packet->type = hpsb_async;
 112         packet->tcode = TCODE_ISO_DATA;
 113 }
 114
 115 /**
 116  * hpsb_get_tlabel - allocate a transaction label
 117  * @packet: the packet who's tlabel/tpool we set
 118  *
 119  * Every asynchronous transaction on the 1394 bus needs a transaction
 120  * label to match the response to the request.  This label has to be
 121  * different from any other transaction label in an outstanding request to
 122  * the same node to make matching possible without ambiguity.
 123  *
 124  * There are 64 different tlabels, so an allocated tlabel has to be freed
 125  * with hpsb_free_tlabel() after the transaction is complete (unless it's
 126  * reused again for the same target node).
 127  *
 128  * Return value: Zero on success, otherwise non-zero. A non-zero return
 129  * generally means there are no available tlabels. If this is called out
 130  * of interrupt or atomic context, then it will sleep until can return a
 131  * tlabel.
 132  */
 133 int hpsb_get_tlabel(struct hpsb_packet *packet)
 134 {
 135         unsigned long flags;
 136         struct hpsb_tlabel_pool *tp;
 137
 138         tp = &packet->host->tpool[packet->node_id & NODE_MASK];
 139
 140         if (irqs_disabled() || in_atomic()) {
 141                 if (down_trylock(&tp->count))
 142                         return 1;
 143         } else {
 144                 down(&tp->count);
 145         }
 146
 147         spin_lock_irqsave(&tp->lock, flags);
 148
 149         packet->tlabel = find_next_zero_bit(tp->pool, 64, tp->next);
 150         if (packet->tlabel > 63)
 151                 packet->tlabel = find_first_zero_bit(tp->pool, 64);
 152         tp->next = (packet->tlabel + 1) % 64;
 153         /* Should _never_ happen */
 154         BUG_ON(test_and_set_bit(packet->tlabel, tp->pool));
 155         tp->allocations++;
 156         spin_unlock_irqrestore(&tp->lock, flags);
 157
 158         return 0;
 159 }
 160
 161 /**
 162  * hpsb_free_tlabel - free an allocated transaction label
 163  * @packet: packet whos tlabel/tpool needs to be cleared
 164  *
 165  * Frees the transaction label allocated with hpsb_get_tlabel().  The
 166  * tlabel has to be freed after the transaction is complete (i.e. response
 167  * was received for a split transaction or packet was sent for a unified
 168  * transaction).
 169  *
 170  * A tlabel must not be freed twice.
 171  */
 172 void hpsb_free_tlabel(struct hpsb_packet *packet)
 173 {
 174         unsigned long flags;
 175         struct hpsb_tlabel_pool *tp;
 176
 177         tp = &packet->host->tpool[packet->node_id & NODE_MASK];
 178
 179         BUG_ON(packet->tlabel > 63 || packet->tlabel < 0);
 180
 181         spin_lock_irqsave(&tp->lock, flags);
 182         BUG_ON(!test_and_clear_bit(packet->tlabel, tp->pool));
 183         spin_unlock_irqrestore(&tp->lock, flags);
 184
 185         up(&tp->count);
 186 }
 187
 188
 189
 190 int hpsb_packet_success(struct hpsb_packet *packet)
 191 {
 192         switch (packet->ack_code) {
 193         case ACK_PENDING:
 194                 switch ((packet->header[1] >> 12) & 0xf) {
 195                 case RCODE_COMPLETE:
 196                         return 0;
 197                 case RCODE_CONFLICT_ERROR:
 198                         return -EAGAIN;
 199                 case RCODE_DATA_ERROR:
 200                         return -EREMOTEIO;
 201                 case RCODE_TYPE_ERROR:
 202                         return -EACCES;
 203                 case RCODE_ADDRESS_ERROR:
 204                         return -EINVAL;
 205                 default:
 206                         HPSB_ERR("received reserved rcode %d from node %d",
 207                                  (packet->header[1] >> 12) & 0xf,
 208                                  packet->node_id);
 209                         return -EAGAIN;
 210                 }
 211                 HPSB_PANIC("reached unreachable code 1 in %s", __FUNCTION__);
 212
 213         case ACK_BUSY_X:
 214         case ACK_BUSY_A:
 215         case ACK_BUSY_B:
 216                 return -EBUSY;
 217
 218         case ACK_TYPE_ERROR:
 219                 return -EACCES;
 220
 221         case ACK_COMPLETE:
 222                 if (packet->tcode == TCODE_WRITEQ
 223                     || packet->tcode == TCODE_WRITEB) {
 224                         return 0;
 225                 } else {
 226                         HPSB_ERR("impossible ack_complete from node %d "
 227                                  "(tcode %d)", packet->node_id, packet->tcode);
 228                         return -EAGAIN;
 229                 }
 230
 231
 232         case ACK_DATA_ERROR:
 233                 if (packet->tcode == TCODE_WRITEB
 234                     || packet->tcode == TCODE_LOCK_REQUEST) {
 235                         return -EAGAIN;
 236                 } else {
 237                         HPSB_ERR("impossible ack_data_error from node %d "
 238                                  "(tcode %d)", packet->node_id, packet->tcode);
 239                         return -EAGAIN;
 240                 }
 241
 242         case ACK_ADDRESS_ERROR:
 243                 return -EINVAL;
 244
 245         case ACK_TARDY:
 246         case ACK_CONFLICT_ERROR:
 247         case ACKX_NONE:
 248         case ACKX_SEND_ERROR:
 249         case ACKX_ABORTED:
 250         case ACKX_TIMEOUT:
 251                 /* error while sending */
 252                 return -EAGAIN;
 253
 254         default:
 255                 HPSB_ERR("got invalid ack %d from node %d (tcode %d)",
 256                          packet->ack_code, packet->node_id, packet->tcode);
 257                 return -EAGAIN;
 258         }
 259
 260         HPSB_PANIC("reached unreachable code 2 in %s", __FUNCTION__);
 261 }
 262
 263 struct hpsb_packet *hpsb_make_readpacket(struct hpsb_host *host, nodeid_t node,
 264                                          u64 addr, size_t length)
 265 {
 266         struct hpsb_packet *packet;
 267
 268         if (length == 0)
 269                 return NULL;
 270
 271         packet = hpsb_alloc_packet(length);
 272         if (!packet)
 273                 return NULL;
 274
 275         packet->host = host;
 276         packet->node_id = node;
 277
 278         if (hpsb_get_tlabel(packet)) {
 279                 hpsb_free_packet(packet);
 280                 return NULL;
 281         }
 282
 283         if (length == 4)
 284                 fill_async_readquad(packet, addr);
 285         else
 286                 fill_async_readblock(packet, addr, length);
 287
 288         return packet;
 289 }
 290
 291 struct hpsb_packet *hpsb_make_writepacket (struct hpsb_host *host, nodeid_t node,
 292                                            u64 addr, quadlet_t *buffer, size_t length)
 293 {
 294         struct hpsb_packet *packet;
 295
 296         if (length == 0)
 297                 return NULL;
 298
 299         packet = hpsb_alloc_packet(length);
 300         if (!packet)
 301                 return NULL;
 302
 303         if (length % 4) { /* zero padding bytes */
 304                 packet->data[length >> 2] = 0;
 305         }
 306         packet->host = host;
 307         packet->node_id = node;
 308
 309         if (hpsb_get_tlabel(packet)) {
 310                 hpsb_free_packet(packet);
 311                 return NULL;
 312         }
 313
 314         if (length == 4) {
 315                 fill_async_writequad(packet, addr, buffer ? *buffer : 0);
 316         } else {
 317                 fill_async_writeblock(packet, addr, length);
 318                 if (buffer)
 319                         memcpy(packet->data, buffer, length);
 320         }
 321
 322         return packet;
 323 }
 324
 325 struct hpsb_packet *hpsb_make_streampacket(struct hpsb_host *host, u8 *buffer, int length,
 326                                            int channel, int tag, int sync)
 327 {
 328         struct hpsb_packet *packet;
 329
 330         if (length == 0)
 331                 return NULL;
 332
 333         packet = hpsb_alloc_packet(length);
 334         if (!packet)
 335                 return NULL;
 336
 337         if (length % 4) { /* zero padding bytes */
 338                 packet->data[length >> 2] = 0;
 339         }
 340         packet->host = host;
 341
 342         if (hpsb_get_tlabel(packet)) {
 343                 hpsb_free_packet(packet);
 344                 return NULL;
 345         }
 346
 347         fill_async_stream_packet(packet, length, channel, tag, sync);
 348         if (buffer)
 349                 memcpy(packet->data, buffer, length);
 350
 351         return packet;
 352 }
 353
 354 struct hpsb_packet *hpsb_make_lockpacket(struct hpsb_host *host, nodeid_t node,
 355                                          u64 addr, int extcode, quadlet_t *data,
 356                                          quadlet_t arg)
 357 {
 358         struct hpsb_packet *p;
 359         u32 length;
 360
 361         p = hpsb_alloc_packet(8);
 362         if (!p) return NULL;
 363
 364         p->host = host;
 365         p->node_id = node;
 366         if (hpsb_get_tlabel(p)) {
 367                 hpsb_free_packet(p);
 368                 return NULL;
 369         }
 370
 371         switch (extcode) {
 372         case EXTCODE_FETCH_ADD:
 373         case EXTCODE_LITTLE_ADD:
 374                 length = 4;
 375                 if (data)
 376                         p->data[0] = *data;
 377                 break;
 378         default:
 379                 length = 8;
 380                 if (data) {
 381                         p->data[0] = arg;
 382                         p->data[1] = *data;
 383                 }
 384                 break;
 385         }
 386         fill_async_lock(p, addr, extcode, length);
 387
 388         return p;
 389 }
 390
 391 struct hpsb_packet *hpsb_make_lock64packet(struct hpsb_host *host, nodeid_t node,
 392                                            u64 addr, int extcode, octlet_t *data,
 393                                            octlet_t arg)
 394 {
 395         struct hpsb_packet *p;
 396         u32 length;
 397
 398         p = hpsb_alloc_packet(16);
 399         if (!p) return NULL;
 400
 401         p->host = host;
 402         p->node_id = node;
 403         if (hpsb_get_tlabel(p)) {
 404                 hpsb_free_packet(p);
 405                 return NULL;
 406         }
 407
 408         switch (extcode) {
 409         case EXTCODE_FETCH_ADD:
 410         case EXTCODE_LITTLE_ADD:
 411                 length = 8;
 412                 if (data) {
 413                         p->data[0] = *data >> 32;
 414                         p->data[1] = *data & 0xffffffff;
 415                 }
 416                 break;
 417         default:
 418                 length = 16;
 419                 if (data) {
 420                         p->data[0] = arg >> 32;
 421                         p->data[1] = arg & 0xffffffff;
 422                         p->data[2] = *data >> 32;
 423                         p->data[3] = *data & 0xffffffff;
 424                 }
 425                 break;
 426         }
 427         fill_async_lock(p, addr, extcode, length);
 428
 429         return p;
 430 }
 431
 432 struct hpsb_packet *hpsb_make_phypacket(struct hpsb_host *host,
 433                                         quadlet_t data)
 434 {
 435         struct hpsb_packet *p;
 436
 437         p = hpsb_alloc_packet(0);
 438         if (!p) return NULL;
 439
 440         p->host = host;
 441         fill_phy_packet(p, data);
 442
 443         return p;
 444 }
 445
 446 struct hpsb_packet *hpsb_make_isopacket(struct hpsb_host *host,
 447                                         int length, int channel,
 448                                         int tag, int sync)
 449 {
 450         struct hpsb_packet *p;
 451
 452         p = hpsb_alloc_packet(length);
 453         if (!p) return NULL;
 454
 455         p->host = host;
 456         fill_iso_packet(p, length, channel, tag, sync);
 457
 458         p->generation = get_hpsb_generation(host);
 459
 460         return p;
 461 }
 462
 463 /*
 464  * FIXME - these functions should probably read from / write to user space to
 465  * avoid in kernel buffers for user space callers
 466  */
 467
 468 int hpsb_read(struct hpsb_host *host, nodeid_t node, unsigned int generation,
 469               u64 addr, quadlet_t *buffer, size_t length)
 470 {
 471         struct hpsb_packet *packet;
 472         int retval = 0;
 473
 474         if (length == 0)
 475                 return -EINVAL;
 476
 477         BUG_ON(in_interrupt()); // We can't be called in an interrupt, yet
 478
 479         packet = hpsb_make_readpacket(host, node, addr, length);
 480
 481         if (!packet) {
 482                 return -ENOMEM;
 483         }
 484
 485         packet->generation = generation;
 486         retval = hpsb_send_packet_and_wait(packet);
 487         if (retval < 0)
 488                 goto hpsb_read_fail;
 489
 490         retval = hpsb_packet_success(packet);
 491
 492         if (retval == 0) {
 493                 if (length == 4) {
 494                         *buffer = packet->header[3];
 495                 } else {
 496                         memcpy(buffer, packet->data, length);
 497                 }
 498         }
 499
 500 hpsb_read_fail:
 501         hpsb_free_tlabel(packet);
 502         hpsb_free_packet(packet);
 503
 504         return retval;
 505 }
 506
 507
 508 int hpsb_write(struct hpsb_host *host, nodeid_t node, unsigned int generation,
 509                u64 addr, quadlet_t *buffer, size_t length)
 510 {
 511         struct hpsb_packet *packet;
 512         int retval;
 513
 514         if (length == 0)
 515                 return -EINVAL;
 516
 517         BUG_ON(in_interrupt()); // We can't be called in an interrupt, yet
 518
 519         packet = hpsb_make_writepacket (host, node, addr, buffer, length);
 520
 521         if (!packet)
 522                 return -ENOMEM;
 523
 524         packet->generation = generation;
 525         retval = hpsb_send_packet_and_wait(packet);
 526         if (retval < 0)
 527                 goto hpsb_write_fail;
 528
 529         retval = hpsb_packet_success(packet);
 530
 531 hpsb_write_fail:
 532         hpsb_free_tlabel(packet);
 533         hpsb_free_packet(packet);
 534
 535         return retval;
 536 }
 537
 538 #if 0
 539
 540 int hpsb_lock(struct hpsb_host *host, nodeid_t node, unsigned int generation,
 541               u64 addr, int extcode, quadlet_t *data, quadlet_t arg)
 542 {
 543         struct hpsb_packet *packet;
 544         int retval = 0;
 545
 546         BUG_ON(in_interrupt()); // We can't be called in an interrupt, yet
 547
 548         packet = hpsb_make_lockpacket(host, node, addr, extcode, data, arg);
 549         if (!packet)
 550                 return -ENOMEM;
 551
 552         packet->generation = generation;
 553         retval = hpsb_send_packet_and_wait(packet);
 554         if (retval < 0)
 555                 goto hpsb_lock_fail;
 556
 557         retval = hpsb_packet_success(packet);
 558
 559         if (retval == 0) {
 560                 *data = packet->data[0];
 561         }
 562
 563 hpsb_lock_fail:
 564         hpsb_free_tlabel(packet);
 565         hpsb_free_packet(packet);
 566
 567         return retval;
 568 }
 569
 570
 571 int hpsb_send_gasp(struct hpsb_host *host, int channel, unsigned int generation,
 572                    quadlet_t *buffer, size_t length, u32 specifier_id,
 573                    unsigned int version)
 574 {
 575         struct hpsb_packet *packet;
 576         int retval = 0;
 577         u16 specifier_id_hi = (specifier_id & 0x00ffff00) >> 8;
 578         u8 specifier_id_lo = specifier_id & 0xff;
 579
 580         HPSB_VERBOSE("Send GASP: channel = %d, length = %Zd", channel, length);
 581
 582         length += 8;
 583
 584         packet = hpsb_make_streampacket(host, NULL, length, channel, 3, 0);
 585         if (!packet)
 586                 return -ENOMEM;
 587
 588         packet->data[0] = cpu_to_be32((host->node_id << 16) | specifier_id_hi);
 589         packet->data[1] = cpu_to_be32((specifier_id_lo << 24) | (version & 0x00ffffff));
 590
 591         memcpy(&(packet->data[2]), buffer, length - 8);
 592
 593         packet->generation = generation;
 594
 595         packet->no_waiter = 1;
 596
 597         retval = hpsb_send_packet(packet);
 598         if (retval < 0)
 599                 hpsb_free_packet(packet);
 600
 601         return retval;
 602 }
 603
 604 #endif  /*  0  */