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 #include "ieee1394_transactions.h"
  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 static void fill_async_readquad(struct hpsb_packet *packet, u64 addr)
  35 {
  36         PREP_ASYNC_HEAD_ADDRESS(TCODE_READQ);
  37         packet->header_size = 12;
  38         packet->data_size = 0;
  39         packet->expect_response = 1;
  40 }
  41
  42 static void fill_async_readblock(struct hpsb_packet *packet, u64 addr,
  43                                  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,
  53                                  quadlet_t data)
  54 {
  55         PREP_ASYNC_HEAD_ADDRESS(TCODE_WRITEQ);
  56         packet->header[3] = data;
  57         packet->header_size = 16;
  58         packet->data_size = 0;
  59         packet->expect_response = 1;
  60 }
  61
  62 static void fill_async_writeblock(struct hpsb_packet *packet, u64 addr,
  63                                   int length)
  64 {
  65         PREP_ASYNC_HEAD_ADDRESS(TCODE_WRITEB);
  66         packet->header[3] = length << 16;
  67         packet->header_size = 16;
  68         packet->expect_response = 1;
  69         packet->data_size = length + (length % 4 ? 4 - (length % 4) : 0);
  70 }
  71
  72 static void fill_async_lock(struct hpsb_packet *packet, u64 addr, int extcode,
  73                             int length)
  74 {
  75         PREP_ASYNC_HEAD_ADDRESS(TCODE_LOCK_REQUEST);
  76         packet->header[3] = (length << 16) | extcode;
  77         packet->header_size = 16;
  78         packet->data_size = length;
  79         packet->expect_response = 1;
  80 }
  81
  82 static void fill_iso_packet(struct hpsb_packet *packet, int length, int channel,
  83                             int tag, int sync)
  84 {
  85         packet->header[0] = (length << 16) | (tag << 14) | (channel << 8)
  86             | (TCODE_ISO_DATA << 4) | sync;
  87
  88         packet->header_size = 4;
  89         packet->data_size = length;
  90         packet->type = hpsb_iso;
  91         packet->tcode = TCODE_ISO_DATA;
  92 }
  93
  94 static void fill_phy_packet(struct hpsb_packet *packet, quadlet_t data)
  95 {
  96         packet->header[0] = data;
  97         packet->header[1] = ~data;
  98         packet->header_size = 8;
  99         packet->data_size = 0;
 100         packet->expect_response = 0;
 101         packet->type = hpsb_raw;        /* No CRC added */
 102         packet->speed_code = IEEE1394_SPEED_100;        /* Force speed to be 100Mbps */
 103 }
 104
 105 static void fill_async_stream_packet(struct hpsb_packet *packet, int length,
 106                                      int channel, int tag, int sync)
 107 {
 108         packet->header[0] = (length << 16) | (tag << 14) | (channel << 8)
 109             | (TCODE_STREAM_DATA << 4) | sync;
 110
 111         packet->header_size = 4;
 112         packet->data_size = length;
 113         packet->type = hpsb_async;
 114         packet->tcode = TCODE_ISO_DATA;
 115 }
 116
 117 /**
 118  * hpsb_get_tlabel - allocate a transaction label
 119  * @packet: the packet who's tlabel/tpool we set
 120  *
 121  * Every asynchronous transaction on the 1394 bus needs a transaction
 122  * label to match the response to the request.  This label has to be
 123  * different from any other transaction label in an outstanding request to
 124  * the same node to make matching possible without ambiguity.
 125  *
 126  * There are 64 different tlabels, so an allocated tlabel has to be freed
 127  * with hpsb_free_tlabel() after the transaction is complete (unless it's
 128  * reused again for the same target node).
 129  *
 130  * Return value: Zero on success, otherwise non-zero. A non-zero return
 131  * generally means there are no available tlabels. If this is called out
 132  * of interrupt or atomic context, then it will sleep until can return a
 133  * tlabel.
 134  */
 135 int hpsb_get_tlabel(struct hpsb_packet *packet)
 136 {
 137         unsigned long flags;
 138         struct hpsb_tlabel_pool *tp;
 139
 140         tp = &packet->host->tpool[packet->node_id & NODE_MASK];
 141
 142         if (irqs_disabled() || in_atomic()) {
 143                 if (down_trylock(&tp->count))
 144                         return 1;
 145         } else {
 146                 down(&tp->count);
 147         }
 148
 149         spin_lock_irqsave(&tp->lock, flags);
 150
 151         packet->tlabel = find_next_zero_bit(tp->pool, 64, tp->next);
 152         if (packet->tlabel > 63)
 153                 packet->tlabel = find_first_zero_bit(tp->pool, 64);
 154         tp->next = (packet->tlabel + 1) % 64;
 155         /* Should _never_ happen */
 156         BUG_ON(test_and_set_bit(packet->tlabel, tp->pool));
 157         tp->allocations++;
 158         spin_unlock_irqrestore(&tp->lock, flags);
 159
 160         return 0;
 161 }
 162
 163 /**
 164  * hpsb_free_tlabel - free an allocated transaction label
 165  * @packet: packet whos tlabel/tpool needs to be cleared
 166  *
 167  * Frees the transaction label allocated with hpsb_get_tlabel().  The
 168  * tlabel has to be freed after the transaction is complete (i.e. response
 169  * was received for a split transaction or packet was sent for a unified
 170  * transaction).
 171  *
 172  * A tlabel must not be freed twice.
 173  */
 174 void hpsb_free_tlabel(struct hpsb_packet *packet)
 175 {
 176         unsigned long flags;
 177         struct hpsb_tlabel_pool *tp;
 178
 179         tp = &packet->host->tpool[packet->node_id & NODE_MASK];
 180
 181         BUG_ON(packet->tlabel > 63 || packet->tlabel < 0);
 182
 183         spin_lock_irqsave(&tp->lock, flags);
 184         BUG_ON(!test_and_clear_bit(packet->tlabel, tp->pool));
 185         spin_unlock_irqrestore(&tp->lock, flags);
 186
 187         up(&tp->count);
 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         case ACK_DATA_ERROR:
 232                 if (packet->tcode == TCODE_WRITEB
 233                     || packet->tcode == TCODE_LOCK_REQUEST) {
 234                         return -EAGAIN;
 235                 } else {
 236                         HPSB_ERR("impossible ack_data_error from node %d "
 237                                  "(tcode %d)", packet->node_id, packet->tcode);
 238                         return -EAGAIN;
 239                 }
 240
 241         case ACK_ADDRESS_ERROR:
 242                 return -EINVAL;
 243
 244         case ACK_TARDY:
 245         case ACK_CONFLICT_ERROR:
 246         case ACKX_NONE:
 247         case ACKX_SEND_ERROR:
 248         case ACKX_ABORTED:
 249         case ACKX_TIMEOUT:
 250                 /* error while sending */
 251                 return -EAGAIN;
 252
 253         default:
 254                 HPSB_ERR("got invalid ack %d from node %d (tcode %d)",
 255                          packet->ack_code, packet->node_id, packet->tcode);
 256                 return -EAGAIN;
 257         }
 258
 259         HPSB_PANIC("reached unreachable code 2 in %s", __FUNCTION__);
 260 }
 261
 262 struct hpsb_packet *hpsb_make_readpacket(struct hpsb_host *host, nodeid_t node,
 263                                          u64 addr, size_t length)
 264 {
 265         struct hpsb_packet *packet;
 266
 267         if (length == 0)
 268                 return NULL;
 269
 270         packet = hpsb_alloc_packet(length);
 271         if (!packet)
 272                 return NULL;
 273
 274         packet->host = host;
 275         packet->node_id = node;
 276
 277         if (hpsb_get_tlabel(packet)) {
 278                 hpsb_free_packet(packet);
 279                 return NULL;
 280         }
 281
 282         if (length == 4)
 283                 fill_async_readquad(packet, addr);
 284         else
 285                 fill_async_readblock(packet, addr, length);
 286
 287         return packet;
 288 }
 289
 290 struct hpsb_packet *hpsb_make_writepacket(struct hpsb_host *host, nodeid_t node,
 291                                           u64 addr, quadlet_t * buffer,
 292                                           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,
 326                                            int length, int channel, int tag,
 327                                            int sync)
 328 {
 329         struct hpsb_packet *packet;
 330
 331         if (length == 0)
 332                 return NULL;
 333
 334         packet = hpsb_alloc_packet(length);
 335         if (!packet)
 336                 return NULL;
 337
 338         if (length % 4) {       /* zero padding bytes */
 339                 packet->data[length >> 2] = 0;
 340         }
 341         packet->host = host;
 342
 343         if (hpsb_get_tlabel(packet)) {
 344                 hpsb_free_packet(packet);
 345                 return NULL;
 346         }
 347
 348         fill_async_stream_packet(packet, length, channel, tag, sync);
 349         if (buffer)
 350                 memcpy(packet->data, buffer, length);
 351
 352         return packet;
 353 }
 354
 355 struct hpsb_packet *hpsb_make_lockpacket(struct hpsb_host *host, nodeid_t node,
 356                                          u64 addr, int extcode,
 357                                          quadlet_t * data, quadlet_t arg)
 358 {
 359         struct hpsb_packet *p;
 360         u32 length;
 361
 362         p = hpsb_alloc_packet(8);
 363         if (!p)
 364                 return NULL;
 365
 366         p->host = host;
 367         p->node_id = node;
 368         if (hpsb_get_tlabel(p)) {
 369                 hpsb_free_packet(p);
 370                 return NULL;
 371         }
 372
 373         switch (extcode) {
 374         case EXTCODE_FETCH_ADD:
 375         case EXTCODE_LITTLE_ADD:
 376                 length = 4;
 377                 if (data)
 378                         p->data[0] = *data;
 379                 break;
 380         default:
 381                 length = 8;
 382                 if (data) {
 383                         p->data[0] = arg;
 384                         p->data[1] = *data;
 385                 }
 386                 break;
 387         }
 388         fill_async_lock(p, addr, extcode, length);
 389
 390         return p;
 391 }
 392
 393 struct hpsb_packet *hpsb_make_lock64packet(struct hpsb_host *host,
 394                                            nodeid_t node, u64 addr, int extcode,
 395                                            octlet_t * data, octlet_t arg)
 396 {
 397         struct hpsb_packet *p;
 398         u32 length;
 399
 400         p = hpsb_alloc_packet(16);
 401         if (!p)
 402                 return NULL;
 403
 404         p->host = host;
 405         p->node_id = node;
 406         if (hpsb_get_tlabel(p)) {
 407                 hpsb_free_packet(p);
 408                 return NULL;
 409         }
 410
 411         switch (extcode) {
 412         case EXTCODE_FETCH_ADD:
 413         case EXTCODE_LITTLE_ADD:
 414                 length = 8;
 415                 if (data) {
 416                         p->data[0] = *data >> 32;
 417                         p->data[1] = *data & 0xffffffff;
 418                 }
 419                 break;
 420         default:
 421                 length = 16;
 422                 if (data) {
 423                         p->data[0] = arg >> 32;
 424                         p->data[1] = arg & 0xffffffff;
 425                         p->data[2] = *data >> 32;
 426                         p->data[3] = *data & 0xffffffff;
 427                 }
 428                 break;
 429         }
 430         fill_async_lock(p, addr, extcode, length);
 431
 432         return p;
 433 }
 434
 435 struct hpsb_packet *hpsb_make_phypacket(struct hpsb_host *host, quadlet_t data)
 436 {
 437         struct hpsb_packet *p;
 438
 439         p = hpsb_alloc_packet(0);
 440         if (!p)
 441                 return NULL;
 442
 443         p->host = host;
 444         fill_phy_packet(p, data);
 445
 446         return p;
 447 }
 448
 449 struct hpsb_packet *hpsb_make_isopacket(struct hpsb_host *host,
 450                                         int length, int channel,
 451                                         int tag, int sync)
 452 {
 453         struct hpsb_packet *p;
 454
 455         p = hpsb_alloc_packet(length);
 456         if (!p)
 457                 return NULL;
 458
 459         p->host = host;
 460         fill_iso_packet(p, length, channel, tag, sync);
 461
 462         p->generation = get_hpsb_generation(host);
 463
 464         return p;
 465 }
 466
 467 /*
 468  * FIXME - these functions should probably read from / write to user space to
 469  * avoid in kernel buffers for user space callers
 470  */
 471
 472 int hpsb_read(struct hpsb_host *host, nodeid_t node, unsigned int generation,
 473               u64 addr, quadlet_t * buffer, size_t length)
 474 {
 475         struct hpsb_packet *packet;
 476         int retval = 0;
 477
 478         if (length == 0)
 479                 return -EINVAL;
 480
 481         BUG_ON(in_interrupt()); // We can't be called in an interrupt, yet
 482
 483         packet = hpsb_make_readpacket(host, node, addr, length);
 484
 485         if (!packet) {
 486                 return -ENOMEM;
 487         }
 488
 489         packet->generation = generation;
 490         retval = hpsb_send_packet_and_wait(packet);
 491         if (retval < 0)
 492                 goto hpsb_read_fail;
 493
 494         retval = hpsb_packet_success(packet);
 495
 496         if (retval == 0) {
 497                 if (length == 4) {
 498                         *buffer = packet->header[3];
 499                 } else {
 500                         memcpy(buffer, packet->data, length);
 501                 }
 502         }
 503
 504       hpsb_read_fail:
 505         hpsb_free_tlabel(packet);
 506         hpsb_free_packet(packet);
 507
 508         return retval;
 509 }
 510
 511 int hpsb_write(struct hpsb_host *host, nodeid_t node, unsigned int generation,
 512                u64 addr, quadlet_t * buffer, size_t length)
 513 {
 514         struct hpsb_packet *packet;
 515         int retval;
 516
 517         if (length == 0)
 518                 return -EINVAL;
 519
 520         BUG_ON(in_interrupt()); // We can't be called in an interrupt, yet
 521
 522         packet = hpsb_make_writepacket(host, node, addr, buffer, length);
 523
 524         if (!packet)
 525                 return -ENOMEM;
 526
 527         packet->generation = generation;
 528         retval = hpsb_send_packet_and_wait(packet);
 529         if (retval < 0)
 530                 goto hpsb_write_fail;
 531
 532         retval = hpsb_packet_success(packet);
 533
 534       hpsb_write_fail:
 535         hpsb_free_tlabel(packet);
 536         hpsb_free_packet(packet);
 537
 538         return retval;
 539 }
 540
 541 #if 0
 542
 543 int hpsb_lock(struct hpsb_host *host, nodeid_t node, unsigned int generation,
 544               u64 addr, int extcode, quadlet_t * data, quadlet_t arg)
 545 {
 546         struct hpsb_packet *packet;
 547         int retval = 0;
 548
 549         BUG_ON(in_interrupt()); // We can't be called in an interrupt, yet
 550
 551         packet = hpsb_make_lockpacket(host, node, addr, extcode, data, arg);
 552         if (!packet)
 553                 return -ENOMEM;
 554
 555         packet->generation = generation;
 556         retval = hpsb_send_packet_and_wait(packet);
 557         if (retval < 0)
 558                 goto hpsb_lock_fail;
 559
 560         retval = hpsb_packet_success(packet);
 561
 562         if (retval == 0) {
 563                 *data = packet->data[0];
 564         }
 565
 566       hpsb_lock_fail:
 567         hpsb_free_tlabel(packet);
 568         hpsb_free_packet(packet);
 569
 570         return retval;
 571 }
 572
 573 int hpsb_send_gasp(struct hpsb_host *host, int channel, unsigned int generation,
 574                    quadlet_t * buffer, size_t length, u32 specifier_id,
 575                    unsigned int version)
 576 {
 577         struct hpsb_packet *packet;
 578         int retval = 0;
 579         u16 specifier_id_hi = (specifier_id & 0x00ffff00) >> 8;
 580         u8 specifier_id_lo = specifier_id & 0xff;
 581
 582         HPSB_VERBOSE("Send GASP: channel = %d, length = %Zd", channel, length);
 583
 584         length += 8;
 585
 586         packet = hpsb_make_streampacket(host, NULL, length, channel, 3, 0);
 587         if (!packet)
 588                 return -ENOMEM;
 589
 590         packet->data[0] = cpu_to_be32((host->node_id << 16) | specifier_id_hi);
 591         packet->data[1] =
 592             cpu_to_be32((specifier_id_lo << 24) | (version & 0x00ffffff));
 593
 594         memcpy(&(packet->data[2]), buffer, length - 8);
 595
 596         packet->generation = generation;
 597
 598         packet->no_waiter = 1;
 599
 600         retval = hpsb_send_packet(packet);
 601         if (retval < 0)
 602                 hpsb_free_packet(packet);
 603
 604         return retval;
 605 }
 606
 607 #endif                          /*  0  */