drivers/scsi/ibmvscsi/ibmvscsi.c

   1 /* ------------------------------------------------------------
   2  * ibmvscsi.c
   3  * (C) Copyright IBM Corporation 1994, 2004
   4  * Authors: Colin DeVilbiss (devilbis@us.ibm.com)
   5  *          Santiago Leon (santil@us.ibm.com)
   6  *          Dave Boutcher (sleddog@us.ibm.com)
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
  21  * USA
  22  *
  23  * ------------------------------------------------------------
  24  * Emulation of a SCSI host adapter for Virtual I/O devices
  25  *
  26  * This driver supports the SCSI adapter implemented by the IBM
  27  * Power5 firmware.  That SCSI adapter is not a physical adapter,
  28  * but allows Linux SCSI peripheral drivers to directly
  29  * access devices in another logical partition on the physical system.
  30  *
  31  * The virtual adapter(s) are present in the open firmware device
  32  * tree just like real adapters.
  33  *
  34  * One of the capabilities provided on these systems is the ability
  35  * to DMA between partitions.  The architecture states that for VSCSI,
  36  * the server side is allowed to DMA to and from the client.  The client
  37  * is never trusted to DMA to or from the server directly.
  38  *
  39  * Messages are sent between partitions on a "Command/Response Queue"
  40  * (CRQ), which is just a buffer of 16 byte entries in the receiver's
  41  * Senders cannot access the buffer directly, but send messages by
  42  * making a hypervisor call and passing in the 16 bytes.  The hypervisor
  43  * puts the message in the next 16 byte space in round-robbin fashion,
  44  * turns on the high order bit of the message (the valid bit), and
  45  * generates an interrupt to the receiver (if interrupts are turned on.)
  46  * The receiver just turns off the valid bit when they have copied out
  47  * the message.
  48  *
  49  * The VSCSI client builds a SCSI Remote Protocol (SRP) Information Unit
  50  * (IU) (as defined in the T10 standard available at www.t10.org), gets
  51  * a DMA address for the message, and sends it to the server as the
  52  * payload of a CRQ message.  The server DMAs the SRP IU and processes it,
  53  * including doing any additional data transfers.  When it is done, it
  54  * DMAs the SRP response back to the same address as the request came from,
  55  * and sends a CRQ message back to inform the client that the request has
  56  * completed.
  57  *
  58  * Note that some of the underlying infrastructure is different between
  59  * machines conforming to the "RS/6000 Platform Architecture" (RPA) and
  60  * the older iSeries hypervisor models.  To support both, some low level
  61  * routines have been broken out into rpa_vscsi.c and iseries_vscsi.c.
  62  * The Makefile should pick one, not two, not zero, of these.
  63  *
  64  * TODO: This is currently pretty tied to the IBM i/pSeries hypervisor
  65  * interfaces.  It would be really nice to abstract this above an RDMA
  66  * layer.
  67  */
  68
  69 #include <linux/module.h>
  70 #include <linux/moduleparam.h>
  71 #include <linux/dma-mapping.h>
  72 #include <linux/delay.h>
  73 #include <asm/firmware.h>
  74 #include <asm/vio.h>
  75 #include <scsi/scsi.h>
  76 #include <scsi/scsi_cmnd.h>
  77 #include <scsi/scsi_host.h>
  78 #include <scsi/scsi_device.h>
  79 #include <scsi/scsi_transport_srp.h>
  80 #include "ibmvscsi.h"
  81
  82 /* The values below are somewhat arbitrary default values, but
  83  * OS/400 will use 3 busses (disks, CDs, tapes, I think.)
  84  * Note that there are 3 bits of channel value, 6 bits of id, and
  85  * 5 bits of LUN.
  86  */
  87 static int max_id = 64;
  88 static int max_channel = 3;
  89 static int init_timeout = 5;
  90 static int max_requests = IBMVSCSI_MAX_REQUESTS_DEFAULT;
  91
  92 static struct scsi_transport_template *ibmvscsi_transport_template;
  93
  94 #define IBMVSCSI_VERSION "1.5.8"
  95
  96 static struct ibmvscsi_ops *ibmvscsi_ops;
  97
  98 MODULE_DESCRIPTION("IBM Virtual SCSI");
  99 MODULE_AUTHOR("Dave Boutcher");
 100 MODULE_LICENSE("GPL");
 101 MODULE_VERSION(IBMVSCSI_VERSION);
 102
 103 module_param_named(max_id, max_id, int, S_IRUGO | S_IWUSR);
 104 MODULE_PARM_DESC(max_id, "Largest ID value for each channel");
 105 module_param_named(max_channel, max_channel, int, S_IRUGO | S_IWUSR);
 106 MODULE_PARM_DESC(max_channel, "Largest channel value");
 107 module_param_named(init_timeout, init_timeout, int, S_IRUGO | S_IWUSR);
 108 MODULE_PARM_DESC(init_timeout, "Initialization timeout in seconds");
 109 module_param_named(max_requests, max_requests, int, S_IRUGO | S_IWUSR);
 110 MODULE_PARM_DESC(max_requests, "Maximum requests for this adapter");
 111
 112 /* ------------------------------------------------------------
 113  * Routines for the event pool and event structs
 114  */
 115 /**
 116  * initialize_event_pool: - Allocates and initializes the event pool for a host
 117  * @pool:       event_pool to be initialized
 118  * @size:       Number of events in pool
 119  * @hostdata:   ibmvscsi_host_data who owns the event pool
 120  *
 121  * Returns zero on success.
 122 */
 123 static int initialize_event_pool(struct event_pool *pool,
 124                                  int size, struct ibmvscsi_host_data *hostdata)
 125 {
 126         int i;
 127
 128         pool->size = size;
 129         pool->next = 0;
 130         pool->events = kcalloc(pool->size, sizeof(*pool->events), GFP_KERNEL);
 131         if (!pool->events)
 132                 return -ENOMEM;
 133
 134         pool->iu_storage =
 135             dma_alloc_coherent(hostdata->dev,
 136                                pool->size * sizeof(*pool->iu_storage),
 137                                &pool->iu_token, 0);
 138         if (!pool->iu_storage) {
 139                 kfree(pool->events);
 140                 return -ENOMEM;
 141         }
 142
 143         for (i = 0; i < pool->size; ++i) {
 144                 struct srp_event_struct *evt = &pool->events[i];
 145                 memset(&evt->crq, 0x00, sizeof(evt->crq));
 146                 atomic_set(&evt->free, 1);
 147                 evt->crq.valid = 0x80;
 148                 evt->crq.IU_length = sizeof(*evt->xfer_iu);
 149                 evt->crq.IU_data_ptr = pool->iu_token +
 150                         sizeof(*evt->xfer_iu) * i;
 151                 evt->xfer_iu = pool->iu_storage + i;
 152                 evt->hostdata = hostdata;
 153                 evt->ext_list = NULL;
 154                 evt->ext_list_token = 0;
 155         }
 156
 157         return 0;
 158 }
 159
 160 /**
 161  * release_event_pool: - Frees memory of an event pool of a host
 162  * @pool:       event_pool to be released
 163  * @hostdata:   ibmvscsi_host_data who owns the even pool
 164  *
 165  * Returns zero on success.
 166 */
 167 static void release_event_pool(struct event_pool *pool,
 168                                struct ibmvscsi_host_data *hostdata)
 169 {
 170         int i, in_use = 0;
 171         for (i = 0; i < pool->size; ++i) {
 172                 if (atomic_read(&pool->events[i].free) != 1)
 173                         ++in_use;
 174                 if (pool->events[i].ext_list) {
 175                         dma_free_coherent(hostdata->dev,
 176                                   SG_ALL * sizeof(struct srp_direct_buf),
 177                                   pool->events[i].ext_list,
 178                                   pool->events[i].ext_list_token);
 179                 }
 180         }
 181         if (in_use)
 182                 dev_warn(hostdata->dev, "releasing event pool with %d "
 183                          "events still in use?\n", in_use);
 184         kfree(pool->events);
 185         dma_free_coherent(hostdata->dev,
 186                           pool->size * sizeof(*pool->iu_storage),
 187                           pool->iu_storage, pool->iu_token);
 188 }
 189
 190 /**
 191  * valid_event_struct: - Determines if event is valid.
 192  * @pool:       event_pool that contains the event
 193  * @evt:        srp_event_struct to be checked for validity
 194  *
 195  * Returns zero if event is invalid, one otherwise.
 196 */
 197 static int valid_event_struct(struct event_pool *pool,
 198                                 struct srp_event_struct *evt)
 199 {
 200         int index = evt - pool->events;
 201         if (index < 0 || index >= pool->size)   /* outside of bounds */
 202                 return 0;
 203         if (evt != pool->events + index)        /* unaligned */
 204                 return 0;
 205         return 1;
 206 }
 207
 208 /**
 209  * ibmvscsi_free-event_struct: - Changes status of event to "free"
 210  * @pool:       event_pool that contains the event
 211  * @evt:        srp_event_struct to be modified
 212  *
 213 */
 214 static void free_event_struct(struct event_pool *pool,
 215                                        struct srp_event_struct *evt)
 216 {
 217         if (!valid_event_struct(pool, evt)) {
 218                 dev_err(evt->hostdata->dev, "Freeing invalid event_struct %p "
 219                         "(not in pool %p)\n", evt, pool->events);
 220                 return;
 221         }
 222         if (atomic_inc_return(&evt->free) != 1) {
 223                 dev_err(evt->hostdata->dev, "Freeing event_struct %p "
 224                         "which is not in use!\n", evt);
 225                 return;
 226         }
 227 }
 228
 229 /**
 230  * get_evt_struct: - Gets the next free event in pool
 231  * @pool:       event_pool that contains the events to be searched
 232  *
 233  * Returns the next event in "free" state, and NULL if none are free.
 234  * Note that no synchronization is done here, we assume the host_lock
 235  * will syncrhonze things.
 236 */
 237 static struct srp_event_struct *get_event_struct(struct event_pool *pool)
 238 {
 239         int i;
 240         int poolsize = pool->size;
 241         int offset = pool->next;
 242
 243         for (i = 0; i < poolsize; i++) {
 244                 offset = (offset + 1) % poolsize;
 245                 if (!atomic_dec_if_positive(&pool->events[offset].free)) {
 246                         pool->next = offset;
 247                         return &pool->events[offset];
 248                 }
 249         }
 250
 251         printk(KERN_ERR "ibmvscsi: found no event struct in pool!\n");
 252         return NULL;
 253 }
 254
 255 /**
 256  * init_event_struct: Initialize fields in an event struct that are always
 257  *                    required.
 258  * @evt:        The event
 259  * @done:       Routine to call when the event is responded to
 260  * @format:     SRP or MAD format
 261  * @timeout:    timeout value set in the CRQ
 262  */
 263 static void init_event_struct(struct srp_event_struct *evt_struct,
 264                               void (*done) (struct srp_event_struct *),
 265                               u8 format,
 266                               int timeout)
 267 {
 268         evt_struct->cmnd = NULL;
 269         evt_struct->cmnd_done = NULL;
 270         evt_struct->sync_srp = NULL;
 271         evt_struct->crq.format = format;
 272         evt_struct->crq.timeout = timeout;
 273         evt_struct->done = done;
 274 }
 275
 276 /* ------------------------------------------------------------
 277  * Routines for receiving SCSI responses from the hosting partition
 278  */
 279
 280 /**
 281  * set_srp_direction: Set the fields in the srp related to data
 282  *     direction and number of buffers based on the direction in
 283  *     the scsi_cmnd and the number of buffers
 284  */
 285 static void set_srp_direction(struct scsi_cmnd *cmd,
 286                               struct srp_cmd *srp_cmd,
 287                               int numbuf)
 288 {
 289         u8 fmt;
 290
 291         if (numbuf == 0)
 292                 return;
 293
 294         if (numbuf == 1)
 295                 fmt = SRP_DATA_DESC_DIRECT;
 296         else {
 297                 fmt = SRP_DATA_DESC_INDIRECT;
 298                 numbuf = min(numbuf, MAX_INDIRECT_BUFS);
 299
 300                 if (cmd->sc_data_direction == DMA_TO_DEVICE)
 301                         srp_cmd->data_out_desc_cnt = numbuf;
 302                 else
 303                         srp_cmd->data_in_desc_cnt = numbuf;
 304         }
 305
 306         if (cmd->sc_data_direction == DMA_TO_DEVICE)
 307                 srp_cmd->buf_fmt = fmt << 4;
 308         else
 309                 srp_cmd->buf_fmt = fmt;
 310 }
 311
 312 static void unmap_sg_list(int num_entries,
 313                 struct device *dev,
 314                 struct srp_direct_buf *md)
 315 {
 316         int i;
 317
 318         for (i = 0; i < num_entries; ++i)
 319                 dma_unmap_single(dev, md[i].va, md[i].len, DMA_BIDIRECTIONAL);
 320 }
 321
 322 /**
 323  * unmap_cmd_data: - Unmap data pointed in srp_cmd based on the format
 324  * @cmd:        srp_cmd whose additional_data member will be unmapped
 325  * @dev:        device for which the memory is mapped
 326  *
 327 */
 328 static void unmap_cmd_data(struct srp_cmd *cmd,
 329                            struct srp_event_struct *evt_struct,
 330                            struct device *dev)
 331 {
 332         u8 out_fmt, in_fmt;
 333
 334         out_fmt = cmd->buf_fmt >> 4;
 335         in_fmt = cmd->buf_fmt & ((1U << 4) - 1);
 336
 337         if (out_fmt == SRP_NO_DATA_DESC && in_fmt == SRP_NO_DATA_DESC)
 338                 return;
 339         else if (out_fmt == SRP_DATA_DESC_DIRECT ||
 340                  in_fmt == SRP_DATA_DESC_DIRECT) {
 341                 struct srp_direct_buf *data =
 342                         (struct srp_direct_buf *) cmd->add_data;
 343                 dma_unmap_single(dev, data->va, data->len, DMA_BIDIRECTIONAL);
 344         } else {
 345                 struct srp_indirect_buf *indirect =
 346                         (struct srp_indirect_buf *) cmd->add_data;
 347                 int num_mapped = indirect->table_desc.len /
 348                         sizeof(struct srp_direct_buf);
 349
 350                 if (num_mapped <= MAX_INDIRECT_BUFS) {
 351                         unmap_sg_list(num_mapped, dev, &indirect->desc_list[0]);
 352                         return;
 353                 }
 354
 355                 unmap_sg_list(num_mapped, dev, evt_struct->ext_list);
 356         }
 357 }
 358
 359 static int map_sg_list(struct scsi_cmnd *cmd, int nseg,
 360                        struct srp_direct_buf *md)
 361 {
 362         int i;
 363         struct scatterlist *sg;
 364         u64 total_length = 0;
 365
 366         scsi_for_each_sg(cmd, sg, nseg, i) {
 367                 struct srp_direct_buf *descr = md + i;
 368                 descr->va = sg_dma_address(sg);
 369                 descr->len = sg_dma_len(sg);
 370                 descr->key = 0;
 371                 total_length += sg_dma_len(sg);
 372         }
 373         return total_length;
 374 }
 375
 376 /**
 377  * map_sg_data: - Maps dma for a scatterlist and initializes decriptor fields
 378  * @cmd:        Scsi_Cmnd with the scatterlist
 379  * @srp_cmd:    srp_cmd that contains the memory descriptor
 380  * @dev:        device for which to map dma memory
 381  *
 382  * Called by map_data_for_srp_cmd() when building srp cmd from scsi cmd.
 383  * Returns 1 on success.
 384 */
 385 static int map_sg_data(struct scsi_cmnd *cmd,
 386                        struct srp_event_struct *evt_struct,
 387                        struct srp_cmd *srp_cmd, struct device *dev)
 388 {
 389
 390         int sg_mapped;
 391         u64 total_length = 0;
 392         struct srp_direct_buf *data =
 393                 (struct srp_direct_buf *) srp_cmd->add_data;
 394         struct srp_indirect_buf *indirect =
 395                 (struct srp_indirect_buf *) data;
 396
 397         sg_mapped = scsi_dma_map(cmd);
 398         if (!sg_mapped)
 399                 return 1;
 400         else if (sg_mapped < 0)
 401                 return 0;
 402
 403         set_srp_direction(cmd, srp_cmd, sg_mapped);
 404
 405         /* special case; we can use a single direct descriptor */
 406         if (sg_mapped == 1) {
 407                 map_sg_list(cmd, sg_mapped, data);
 408                 return 1;
 409         }
 410
 411         indirect->table_desc.va = 0;
 412         indirect->table_desc.len = sg_mapped * sizeof(struct srp_direct_buf);
 413         indirect->table_desc.key = 0;
 414
 415         if (sg_mapped <= MAX_INDIRECT_BUFS) {
 416                 total_length = map_sg_list(cmd, sg_mapped,
 417                                            &indirect->desc_list[0]);
 418                 indirect->len = total_length;
 419                 return 1;
 420         }
 421
 422         /* get indirect table */
 423         if (!evt_struct->ext_list) {
 424                 evt_struct->ext_list = (struct srp_direct_buf *)
 425                         dma_alloc_coherent(dev,
 426                                            SG_ALL * sizeof(struct srp_direct_buf),
 427                                            &evt_struct->ext_list_token, 0);
 428                 if (!evt_struct->ext_list) {
 429                         sdev_printk(KERN_ERR, cmd->device,
 430                                     "Can't allocate memory for indirect table\n");
 431                         return 0;
 432                 }
 433         }
 434
 435         total_length = map_sg_list(cmd, sg_mapped, evt_struct->ext_list);
 436
 437         indirect->len = total_length;
 438         indirect->table_desc.va = evt_struct->ext_list_token;
 439         indirect->table_desc.len = sg_mapped * sizeof(indirect->desc_list[0]);
 440         memcpy(indirect->desc_list, evt_struct->ext_list,
 441                MAX_INDIRECT_BUFS * sizeof(struct srp_direct_buf));
 442         return 1;
 443 }
 444
 445 /**
 446  * map_data_for_srp_cmd: - Calls functions to map data for srp cmds
 447  * @cmd:        struct scsi_cmnd with the memory to be mapped
 448  * @srp_cmd:    srp_cmd that contains the memory descriptor
 449  * @dev:        dma device for which to map dma memory
 450  *
 451  * Called by scsi_cmd_to_srp_cmd() when converting scsi cmds to srp cmds
 452  * Returns 1 on success.
 453 */
 454 static int map_data_for_srp_cmd(struct scsi_cmnd *cmd,
 455                                 struct srp_event_struct *evt_struct,
 456                                 struct srp_cmd *srp_cmd, struct device *dev)
 457 {
 458         switch (cmd->sc_data_direction) {
 459         case DMA_FROM_DEVICE:
 460         case DMA_TO_DEVICE:
 461                 break;
 462         case DMA_NONE:
 463                 return 1;
 464         case DMA_BIDIRECTIONAL:
 465                 sdev_printk(KERN_ERR, cmd->device,
 466                             "Can't map DMA_BIDIRECTIONAL to read/write\n");
 467                 return 0;
 468         default:
 469                 sdev_printk(KERN_ERR, cmd->device,
 470                             "Unknown data direction 0x%02x; can't map!\n",
 471                             cmd->sc_data_direction);
 472                 return 0;
 473         }
 474
 475         return map_sg_data(cmd, evt_struct, srp_cmd, dev);
 476 }
 477
 478 /**
 479  * purge_requests: Our virtual adapter just shut down.  purge any sent requests
 480  * @hostdata:    the adapter
 481  */
 482 static void purge_requests(struct ibmvscsi_host_data *hostdata, int error_code)
 483 {
 484         struct srp_event_struct *tmp_evt, *pos;
 485         unsigned long flags;
 486
 487         spin_lock_irqsave(hostdata->host->host_lock, flags);
 488         list_for_each_entry_safe(tmp_evt, pos, &hostdata->sent, list) {
 489                 list_del(&tmp_evt->list);
 490                 del_timer(&tmp_evt->timer);
 491                 if (tmp_evt->cmnd) {
 492                         tmp_evt->cmnd->result = (error_code << 16);
 493                         unmap_cmd_data(&tmp_evt->iu.srp.cmd,
 494                                        tmp_evt,
 495                                        tmp_evt->hostdata->dev);
 496                         if (tmp_evt->cmnd_done)
 497                                 tmp_evt->cmnd_done(tmp_evt->cmnd);
 498                 } else if (tmp_evt->done)
 499                         tmp_evt->done(tmp_evt);
 500                 free_event_struct(&tmp_evt->hostdata->pool, tmp_evt);
 501         }
 502         spin_unlock_irqrestore(hostdata->host->host_lock, flags);
 503 }
 504
 505 /**
 506  * ibmvscsi_reset_host - Reset the connection to the server
 507  * @hostdata:   struct ibmvscsi_host_data to reset
 508 */
 509 static void ibmvscsi_reset_host(struct ibmvscsi_host_data *hostdata)
 510 {
 511         scsi_block_requests(hostdata->host);
 512         atomic_set(&hostdata->request_limit, 0);
 513
 514         purge_requests(hostdata, DID_ERROR);
 515         if ((ibmvscsi_ops->reset_crq_queue(&hostdata->queue, hostdata)) ||
 516             (ibmvscsi_ops->send_crq(hostdata, 0xC001000000000000LL, 0)) ||
 517             (vio_enable_interrupts(to_vio_dev(hostdata->dev)))) {
 518                 atomic_set(&hostdata->request_limit, -1);
 519                 dev_err(hostdata->dev, "error after reset\n");
 520         }
 521
 522         scsi_unblock_requests(hostdata->host);
 523 }
 524
 525 /**
 526  * ibmvscsi_timeout - Internal command timeout handler
 527  * @evt_struct: struct srp_event_struct that timed out
 528  *
 529  * Called when an internally generated command times out
 530 */
 531 static void ibmvscsi_timeout(struct srp_event_struct *evt_struct)
 532 {
 533         struct ibmvscsi_host_data *hostdata = evt_struct->hostdata;
 534
 535         dev_err(hostdata->dev, "Command timed out (%x). Resetting connection\n",
 536                 evt_struct->iu.srp.cmd.opcode);
 537
 538         ibmvscsi_reset_host(hostdata);
 539 }
 540
 541
 542 /* ------------------------------------------------------------
 543  * Routines for sending and receiving SRPs
 544  */
 545 /**
 546  * ibmvscsi_send_srp_event: - Transforms event to u64 array and calls send_crq()
 547  * @evt_struct: evt_struct to be sent
 548  * @hostdata:   ibmvscsi_host_data of host
 549  * @timeout:    timeout in seconds - 0 means do not time command
 550  *
 551  * Returns the value returned from ibmvscsi_send_crq(). (Zero for success)
 552  * Note that this routine assumes that host_lock is held for synchronization
 553 */
 554 static int ibmvscsi_send_srp_event(struct srp_event_struct *evt_struct,
 555                                    struct ibmvscsi_host_data *hostdata,
 556                                    unsigned long timeout)
 557 {
 558         u64 *crq_as_u64 = (u64 *) &evt_struct->crq;
 559         int request_status = 0;
 560         int rc;
 561
 562         /* If we have exhausted our request limit, just fail this request,
 563          * unless it is for a reset or abort.
 564          * Note that there are rare cases involving driver generated requests
 565          * (such as task management requests) that the mid layer may think we
 566          * can handle more requests (can_queue) when we actually can't
 567          */
 568         if (evt_struct->crq.format == VIOSRP_SRP_FORMAT) {
 569                 request_status =
 570                         atomic_dec_if_positive(&hostdata->request_limit);
 571                 /* If request limit was -1 when we started, it is now even
 572                  * less than that
 573                  */
 574                 if (request_status < -1)
 575                         goto send_error;
 576                 /* Otherwise, we may have run out of requests. */
 577                 /* If request limit was 0 when we started the adapter is in the
 578                  * process of performing a login with the server adapter, or
 579                  * we may have run out of requests.
 580                  */
 581                 else if (request_status == -1 &&
 582                          evt_struct->iu.srp.login_req.opcode != SRP_LOGIN_REQ)
 583                         goto send_busy;
 584                 /* Abort and reset calls should make it through.
 585                  * Nothing except abort and reset should use the last two
 586                  * slots unless we had two or less to begin with.
 587                  */
 588                 else if (request_status < 2 &&
 589                          evt_struct->iu.srp.cmd.opcode != SRP_TSK_MGMT) {
 590                         /* In the case that we have less than two requests
 591                          * available, check the server limit as a combination
 592                          * of the request limit and the number of requests
 593                          * in-flight (the size of the send list).  If the
 594                          * server limit is greater than 2, return busy so
 595                          * that the last two are reserved for reset and abort.
 596                          */
 597                         int server_limit = request_status;
 598                         struct srp_event_struct *tmp_evt;
 599
 600                         list_for_each_entry(tmp_evt, &hostdata->sent, list) {
 601                                 server_limit++;
 602                         }
 603
 604                         if (server_limit > 2)
 605                                 goto send_busy;
 606                 }
 607         }
 608
 609         /* Copy the IU into the transfer area */
 610         *evt_struct->xfer_iu = evt_struct->iu;
 611         evt_struct->xfer_iu->srp.rsp.tag = (u64)evt_struct;
 612
 613         /* Add this to the sent list.  We need to do this
 614          * before we actually send
 615          * in case it comes back REALLY fast
 616          */
 617         list_add_tail(&evt_struct->list, &hostdata->sent);
 618
 619         init_timer(&evt_struct->timer);
 620         if (timeout) {
 621                 evt_struct->timer.data = (unsigned long) evt_struct;
 622                 evt_struct->timer.expires = jiffies + (timeout * HZ);
 623                 evt_struct->timer.function = (void (*)(unsigned long))ibmvscsi_timeout;
 624                 add_timer(&evt_struct->timer);
 625         }
 626
 627         if ((rc =
 628              ibmvscsi_ops->send_crq(hostdata, crq_as_u64[0], crq_as_u64[1])) != 0) {
 629                 list_del(&evt_struct->list);
 630                 del_timer(&evt_struct->timer);
 631
 632                 /* If send_crq returns H_CLOSED, return SCSI_MLQUEUE_HOST_BUSY.
 633                  * Firmware will send a CRQ with a transport event (0xFF) to
 634                  * tell this client what has happened to the transport.  This
 635                  * will be handled in ibmvscsi_handle_crq()
 636                  */
 637                 if (rc == H_CLOSED) {
 638                         dev_warn(hostdata->dev, "send warning. "
 639                                  "Receive queue closed, will retry.\n");
 640                         goto send_busy;
 641                 }
 642                 dev_err(hostdata->dev, "send error %d\n", rc);
 643                 atomic_inc(&hostdata->request_limit);
 644                 goto send_error;
 645         }
 646
 647         return 0;
 648
 649  send_busy:
 650         unmap_cmd_data(&evt_struct->iu.srp.cmd, evt_struct, hostdata->dev);
 651
 652         free_event_struct(&hostdata->pool, evt_struct);
 653         if (request_status != -1)
 654                 atomic_inc(&hostdata->request_limit);
 655         return SCSI_MLQUEUE_HOST_BUSY;
 656
 657  send_error:
 658         unmap_cmd_data(&evt_struct->iu.srp.cmd, evt_struct, hostdata->dev);
 659
 660         if (evt_struct->cmnd != NULL) {
 661                 evt_struct->cmnd->result = DID_ERROR << 16;
 662                 evt_struct->cmnd_done(evt_struct->cmnd);
 663         } else if (evt_struct->done)
 664                 evt_struct->done(evt_struct);
 665
 666         free_event_struct(&hostdata->pool, evt_struct);
 667         return 0;
 668 }
 669
 670 /**
 671  * handle_cmd_rsp: -  Handle responses from commands
 672  * @evt_struct: srp_event_struct to be handled
 673  *
 674  * Used as a callback by when sending scsi cmds.
 675  * Gets called by ibmvscsi_handle_crq()
 676 */
 677 static void handle_cmd_rsp(struct srp_event_struct *evt_struct)
 678 {
 679         struct srp_rsp *rsp = &evt_struct->xfer_iu->srp.rsp;
 680         struct scsi_cmnd *cmnd = evt_struct->cmnd;
 681
 682         if (unlikely(rsp->opcode != SRP_RSP)) {
 683                 if (printk_ratelimit())
 684                         dev_warn(evt_struct->hostdata->dev,
 685                                  "bad SRP RSP type %d\n", rsp->opcode);
 686         }
 687
 688         if (cmnd) {
 689                 cmnd->result |= rsp->status;
 690                 if (((cmnd->result >> 1) & 0x1f) == CHECK_CONDITION)
 691                         memcpy(cmnd->sense_buffer,
 692                                rsp->data,
 693                                rsp->sense_data_len);
 694                 unmap_cmd_data(&evt_struct->iu.srp.cmd,
 695                                evt_struct,
 696                                evt_struct->hostdata->dev);
 697
 698                 if (rsp->flags & SRP_RSP_FLAG_DOOVER)
 699                         scsi_set_resid(cmnd, rsp->data_out_res_cnt);
 700                 else if (rsp->flags & SRP_RSP_FLAG_DIOVER)
 701                         scsi_set_resid(cmnd, rsp->data_in_res_cnt);
 702         }
 703
 704         if (evt_struct->cmnd_done)
 705                 evt_struct->cmnd_done(cmnd);
 706 }
 707
 708 /**
 709  * lun_from_dev: - Returns the lun of the scsi device
 710  * @dev:        struct scsi_device
 711  *
 712 */
 713 static inline u16 lun_from_dev(struct scsi_device *dev)
 714 {
 715         return (0x2 << 14) | (dev->id << 8) | (dev->channel << 5) | dev->lun;
 716 }
 717
 718 /**
 719  * ibmvscsi_queue: - The queuecommand function of the scsi template
 720  * @cmd:        struct scsi_cmnd to be executed
 721  * @done:       Callback function to be called when cmd is completed
 722 */
 723 static int ibmvscsi_queuecommand(struct scsi_cmnd *cmnd,
 724                                  void (*done) (struct scsi_cmnd *))
 725 {
 726         struct srp_cmd *srp_cmd;
 727         struct srp_event_struct *evt_struct;
 728         struct srp_indirect_buf *indirect;
 729         struct ibmvscsi_host_data *hostdata = shost_priv(cmnd->device->host);
 730         u16 lun = lun_from_dev(cmnd->device);
 731         u8 out_fmt, in_fmt;
 732
 733         cmnd->result = (DID_OK << 16);
 734         evt_struct = get_event_struct(&hostdata->pool);
 735         if (!evt_struct)
 736                 return SCSI_MLQUEUE_HOST_BUSY;
 737
 738         /* Set up the actual SRP IU */
 739         srp_cmd = &evt_struct->iu.srp.cmd;
 740         memset(srp_cmd, 0x00, SRP_MAX_IU_LEN);
 741         srp_cmd->opcode = SRP_CMD;
 742         memcpy(srp_cmd->cdb, cmnd->cmnd, sizeof(srp_cmd->cdb));
 743         srp_cmd->lun = ((u64) lun) << 48;
 744
 745         if (!map_data_for_srp_cmd(cmnd, evt_struct, srp_cmd, hostdata->dev)) {
 746                 sdev_printk(KERN_ERR, cmnd->device, "couldn't convert cmd to srp_cmd\n");
 747                 free_event_struct(&hostdata->pool, evt_struct);
 748                 return SCSI_MLQUEUE_HOST_BUSY;
 749         }
 750
 751         init_event_struct(evt_struct,
 752                           handle_cmd_rsp,
 753                           VIOSRP_SRP_FORMAT,
 754                           cmnd->timeout_per_command/HZ);
 755
 756         evt_struct->cmnd = cmnd;
 757         evt_struct->cmnd_done = done;
 758
 759         /* Fix up dma address of the buffer itself */
 760         indirect = (struct srp_indirect_buf *) srp_cmd->add_data;
 761         out_fmt = srp_cmd->buf_fmt >> 4;
 762         in_fmt = srp_cmd->buf_fmt & ((1U << 4) - 1);
 763         if ((in_fmt == SRP_DATA_DESC_INDIRECT ||
 764              out_fmt == SRP_DATA_DESC_INDIRECT) &&
 765             indirect->table_desc.va == 0) {
 766                 indirect->table_desc.va = evt_struct->crq.IU_data_ptr +
 767                         offsetof(struct srp_cmd, add_data) +
 768                         offsetof(struct srp_indirect_buf, desc_list);
 769         }
 770
 771         return ibmvscsi_send_srp_event(evt_struct, hostdata, 0);
 772 }
 773
 774 /* ------------------------------------------------------------
 775  * Routines for driver initialization
 776  */
 777 /**
 778  * adapter_info_rsp: - Handle response to MAD adapter info request
 779  * @evt_struct: srp_event_struct with the response
 780  *
 781  * Used as a "done" callback by when sending adapter_info. Gets called
 782  * by ibmvscsi_handle_crq()
 783 */
 784 static void adapter_info_rsp(struct srp_event_struct *evt_struct)
 785 {
 786         struct ibmvscsi_host_data *hostdata = evt_struct->hostdata;
 787         dma_unmap_single(hostdata->dev,
 788                          evt_struct->iu.mad.adapter_info.buffer,
 789                          evt_struct->iu.mad.adapter_info.common.length,
 790                          DMA_BIDIRECTIONAL);
 791
 792         if (evt_struct->xfer_iu->mad.adapter_info.common.status) {
 793                 dev_err(hostdata->dev, "error %d getting adapter info\n",
 794                         evt_struct->xfer_iu->mad.adapter_info.common.status);
 795         } else {
 796                 dev_info(hostdata->dev, "host srp version: %s, "
 797                          "host partition %s (%d), OS %d, max io %u\n",
 798                          hostdata->madapter_info.srp_version,
 799                          hostdata->madapter_info.partition_name,
 800                          hostdata->madapter_info.partition_number,
 801                          hostdata->madapter_info.os_type,
 802                          hostdata->madapter_info.port_max_txu[0]);
 803
 804                 if (hostdata->madapter_info.port_max_txu[0])
 805                         hostdata->host->max_sectors =
 806                                 hostdata->madapter_info.port_max_txu[0] >> 9;
 807
 808                 if (hostdata->madapter_info.os_type == 3 &&
 809                     strcmp(hostdata->madapter_info.srp_version, "1.6a") <= 0) {
 810                         dev_err(hostdata->dev, "host (Ver. %s) doesn't support large transfers\n",
 811                                 hostdata->madapter_info.srp_version);
 812                         dev_err(hostdata->dev, "limiting scatterlists to %d\n",
 813                                 MAX_INDIRECT_BUFS);
 814                         hostdata->host->sg_tablesize = MAX_INDIRECT_BUFS;
 815                 }
 816         }
 817 }
 818
 819 /**
 820  * send_mad_adapter_info: - Sends the mad adapter info request
 821  *      and stores the result so it can be retrieved with
 822  *      sysfs.  We COULD consider causing a failure if the
 823  *      returned SRP version doesn't match ours.
 824  * @hostdata:   ibmvscsi_host_data of host
 825  *
 826  * Returns zero if successful.
 827 */
 828 static void send_mad_adapter_info(struct ibmvscsi_host_data *hostdata)
 829 {
 830         struct viosrp_adapter_info *req;
 831         struct srp_event_struct *evt_struct;
 832         unsigned long flags;
 833         dma_addr_t addr;
 834
 835         evt_struct = get_event_struct(&hostdata->pool);
 836         if (!evt_struct) {
 837                 dev_err(hostdata->dev,
 838                         "couldn't allocate an event for ADAPTER_INFO_REQ!\n");
 839                 return;
 840         }
 841
 842         init_event_struct(evt_struct,
 843                           adapter_info_rsp,
 844                           VIOSRP_MAD_FORMAT,
 845                           init_timeout);
 846
 847         req = &evt_struct->iu.mad.adapter_info;
 848         memset(req, 0x00, sizeof(*req));
 849
 850         req->common.type = VIOSRP_ADAPTER_INFO_TYPE;
 851         req->common.length = sizeof(hostdata->madapter_info);
 852         req->buffer = addr = dma_map_single(hostdata->dev,
 853                                             &hostdata->madapter_info,
 854                                             sizeof(hostdata->madapter_info),
 855                                             DMA_BIDIRECTIONAL);
 856
 857         if (dma_mapping_error(req->buffer)) {
 858                 dev_err(hostdata->dev, "Unable to map request_buffer for adapter_info!\n");
 859                 free_event_struct(&hostdata->pool, evt_struct);
 860                 return;
 861         }
 862
 863         spin_lock_irqsave(hostdata->host->host_lock, flags);
 864         if (ibmvscsi_send_srp_event(evt_struct, hostdata, init_timeout * 2)) {
 865                 dev_err(hostdata->dev, "couldn't send ADAPTER_INFO_REQ!\n");
 866                 dma_unmap_single(hostdata->dev,
 867                                  addr,
 868                                  sizeof(hostdata->madapter_info),
 869                                  DMA_BIDIRECTIONAL);
 870         }
 871         spin_unlock_irqrestore(hostdata->host->host_lock, flags);
 872 };
 873
 874 /**
 875  * login_rsp: - Handle response to SRP login request
 876  * @evt_struct: srp_event_struct with the response
 877  *
 878  * Used as a "done" callback by when sending srp_login. Gets called
 879  * by ibmvscsi_handle_crq()
 880 */
 881 static void login_rsp(struct srp_event_struct *evt_struct)
 882 {
 883         struct ibmvscsi_host_data *hostdata = evt_struct->hostdata;
 884         switch (evt_struct->xfer_iu->srp.login_rsp.opcode) {
 885         case SRP_LOGIN_RSP:     /* it worked! */
 886                 break;
 887         case SRP_LOGIN_REJ:     /* refused! */
 888                 dev_info(hostdata->dev, "SRP_LOGIN_REJ reason %u\n",
 889                          evt_struct->xfer_iu->srp.login_rej.reason);
 890                 /* Login failed.  */
 891                 atomic_set(&hostdata->request_limit, -1);
 892                 return;
 893         default:
 894                 dev_err(hostdata->dev, "Invalid login response typecode 0x%02x!\n",
 895                         evt_struct->xfer_iu->srp.login_rsp.opcode);
 896                 /* Login failed.  */
 897                 atomic_set(&hostdata->request_limit, -1);
 898                 return;
 899         }
 900
 901         dev_info(hostdata->dev, "SRP_LOGIN succeeded\n");
 902
 903         if (evt_struct->xfer_iu->srp.login_rsp.req_lim_delta < 0)
 904                 dev_err(hostdata->dev, "Invalid request_limit.\n");
 905
 906         /* Now we know what the real request-limit is.
 907          * This value is set rather than added to request_limit because
 908          * request_limit could have been set to -1 by this client.
 909          */
 910         atomic_set(&hostdata->request_limit,
 911                    evt_struct->xfer_iu->srp.login_rsp.req_lim_delta);
 912
 913         /* If we had any pending I/Os, kick them */
 914         scsi_unblock_requests(hostdata->host);
 915
 916         send_mad_adapter_info(hostdata);
 917         return;
 918 }
 919
 920 /**
 921  * send_srp_login: - Sends the srp login
 922  * @hostdata:   ibmvscsi_host_data of host
 923  *
 924  * Returns zero if successful.
 925 */
 926 static int send_srp_login(struct ibmvscsi_host_data *hostdata)
 927 {
 928         int rc;
 929         unsigned long flags;
 930         struct srp_login_req *login;
 931         struct srp_event_struct *evt_struct = get_event_struct(&hostdata->pool);
 932         if (!evt_struct) {
 933                 dev_err(hostdata->dev, "couldn't allocate an event for login req!\n");
 934                 return FAILED;
 935         }
 936
 937         init_event_struct(evt_struct,
 938                           login_rsp,
 939                           VIOSRP_SRP_FORMAT,
 940                           init_timeout);
 941
 942         login = &evt_struct->iu.srp.login_req;
 943         memset(login, 0x00, sizeof(struct srp_login_req));
 944         login->opcode = SRP_LOGIN_REQ;
 945         login->req_it_iu_len = sizeof(union srp_iu);
 946         login->req_buf_fmt = SRP_BUF_FORMAT_DIRECT | SRP_BUF_FORMAT_INDIRECT;
 947
 948         spin_lock_irqsave(hostdata->host->host_lock, flags);
 949         /* Start out with a request limit of 0, since this is negotiated in
 950          * the login request we are just sending and login requests always
 951          * get sent by the driver regardless of request_limit.
 952          */
 953         atomic_set(&hostdata->request_limit, 0);
 954
 955         rc = ibmvscsi_send_srp_event(evt_struct, hostdata, init_timeout * 2);
 956         spin_unlock_irqrestore(hostdata->host->host_lock, flags);
 957         dev_info(hostdata->dev, "sent SRP login\n");
 958         return rc;
 959 };
 960
 961 /**
 962  * sync_completion: Signal that a synchronous command has completed
 963  * Note that after returning from this call, the evt_struct is freed.
 964  * the caller waiting on this completion shouldn't touch the evt_struct
 965  * again.
 966  */
 967 static void sync_completion(struct srp_event_struct *evt_struct)
 968 {
 969         /* copy the response back */
 970         if (evt_struct->sync_srp)
 971                 *evt_struct->sync_srp = *evt_struct->xfer_iu;
 972
 973         complete(&evt_struct->comp);
 974 }
 975
 976 /**
 977  * ibmvscsi_abort: Abort a command...from scsi host template
 978  * send this over to the server and wait synchronously for the response
 979  */
 980 static int ibmvscsi_eh_abort_handler(struct scsi_cmnd *cmd)
 981 {
 982         struct ibmvscsi_host_data *hostdata = shost_priv(cmd->device->host);
 983         struct srp_tsk_mgmt *tsk_mgmt;
 984         struct srp_event_struct *evt;
 985         struct srp_event_struct *tmp_evt, *found_evt;
 986         union viosrp_iu srp_rsp;
 987         int rsp_rc;
 988         unsigned long flags;
 989         u16 lun = lun_from_dev(cmd->device);
 990         unsigned long wait_switch = 0;
 991
 992         /* First, find this command in our sent list so we can figure
 993          * out the correct tag
 994          */
 995         spin_lock_irqsave(hostdata->host->host_lock, flags);
 996         wait_switch = jiffies + (init_timeout * HZ);
 997         do {
 998                 found_evt = NULL;
 999                 list_for_each_entry(tmp_evt, &hostdata->sent, list) {
1000                         if (tmp_evt->cmnd == cmd) {
1001                                 found_evt = tmp_evt;
1002                                 break;
1003                         }
1004                 }
1005
1006                 if (!found_evt) {
1007                         spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1008                         return SUCCESS;
1009                 }
1010
1011                 evt = get_event_struct(&hostdata->pool);
1012                 if (evt == NULL) {
1013                         spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1014                         sdev_printk(KERN_ERR, cmd->device,
1015                                 "failed to allocate abort event\n");
1016                         return FAILED;
1017                 }
1018
1019                 init_event_struct(evt,
1020                                   sync_completion,
1021                                   VIOSRP_SRP_FORMAT,
1022                                   init_timeout);
1023
1024                 tsk_mgmt = &evt->iu.srp.tsk_mgmt;
1025
1026                 /* Set up an abort SRP command */
1027                 memset(tsk_mgmt, 0x00, sizeof(*tsk_mgmt));
1028                 tsk_mgmt->opcode = SRP_TSK_MGMT;
1029                 tsk_mgmt->lun = ((u64) lun) << 48;
1030                 tsk_mgmt->tsk_mgmt_func = SRP_TSK_ABORT_TASK;
1031                 tsk_mgmt->task_tag = (u64) found_evt;
1032
1033                 evt->sync_srp = &srp_rsp;
1034
1035                 init_completion(&evt->comp);
1036                 rsp_rc = ibmvscsi_send_srp_event(evt, hostdata, init_timeout * 2);
1037
1038                 if (rsp_rc != SCSI_MLQUEUE_HOST_BUSY)
1039                         break;
1040
1041                 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1042                 msleep(10);
1043                 spin_lock_irqsave(hostdata->host->host_lock, flags);
1044         } while (time_before(jiffies, wait_switch));
1045
1046         spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1047
1048         if (rsp_rc != 0) {
1049                 sdev_printk(KERN_ERR, cmd->device,
1050                             "failed to send abort() event. rc=%d\n", rsp_rc);
1051                 return FAILED;
1052         }
1053
1054         sdev_printk(KERN_INFO, cmd->device,
1055                     "aborting command. lun 0x%lx, tag 0x%lx\n",
1056                     (((u64) lun) << 48), (u64) found_evt);
1057
1058         wait_for_completion(&evt->comp);
1059
1060         /* make sure we got a good response */
1061         if (unlikely(srp_rsp.srp.rsp.opcode != SRP_RSP)) {
1062                 if (printk_ratelimit())
1063                         sdev_printk(KERN_WARNING, cmd->device, "abort bad SRP RSP type %d\n",
1064                                     srp_rsp.srp.rsp.opcode);
1065                 return FAILED;
1066         }
1067
1068         if (srp_rsp.srp.rsp.flags & SRP_RSP_FLAG_RSPVALID)
1069                 rsp_rc = *((int *)srp_rsp.srp.rsp.data);
1070         else
1071                 rsp_rc = srp_rsp.srp.rsp.status;
1072
1073         if (rsp_rc) {
1074                 if (printk_ratelimit())
1075                         sdev_printk(KERN_WARNING, cmd->device,
1076                                     "abort code %d for task tag 0x%lx\n",
1077                                     rsp_rc, tsk_mgmt->task_tag);
1078                 return FAILED;
1079         }
1080
1081         /* Because we dropped the spinlock above, it's possible
1082          * The event is no longer in our list.  Make sure it didn't
1083          * complete while we were aborting
1084          */
1085         spin_lock_irqsave(hostdata->host->host_lock, flags);
1086         found_evt = NULL;
1087         list_for_each_entry(tmp_evt, &hostdata->sent, list) {
1088                 if (tmp_evt->cmnd == cmd) {
1089                         found_evt = tmp_evt;
1090                         break;
1091                 }
1092         }
1093
1094         if (found_evt == NULL) {
1095                 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1096                 sdev_printk(KERN_INFO, cmd->device, "aborted task tag 0x%lx completed\n",
1097                             tsk_mgmt->task_tag);
1098                 return SUCCESS;
1099         }
1100
1101         sdev_printk(KERN_INFO, cmd->device, "successfully aborted task tag 0x%lx\n",
1102                     tsk_mgmt->task_tag);
1103
1104         cmd->result = (DID_ABORT << 16);
1105         list_del(&found_evt->list);
1106         unmap_cmd_data(&found_evt->iu.srp.cmd, found_evt,
1107                        found_evt->hostdata->dev);
1108         free_event_struct(&found_evt->hostdata->pool, found_evt);
1109         spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1110         atomic_inc(&hostdata->request_limit);
1111         return SUCCESS;
1112 }
1113
1114 /**
1115  * ibmvscsi_eh_device_reset_handler: Reset a single LUN...from scsi host
1116  * template send this over to the server and wait synchronously for the
1117  * response
1118  */
1119 static int ibmvscsi_eh_device_reset_handler(struct scsi_cmnd *cmd)
1120 {
1121         struct ibmvscsi_host_data *hostdata = shost_priv(cmd->device->host);
1122         struct srp_tsk_mgmt *tsk_mgmt;
1123         struct srp_event_struct *evt;
1124         struct srp_event_struct *tmp_evt, *pos;
1125         union viosrp_iu srp_rsp;
1126         int rsp_rc;
1127         unsigned long flags;
1128         u16 lun = lun_from_dev(cmd->device);
1129         unsigned long wait_switch = 0;
1130
1131         spin_lock_irqsave(hostdata->host->host_lock, flags);
1132         wait_switch = jiffies + (init_timeout * HZ);
1133         do {
1134                 evt = get_event_struct(&hostdata->pool);
1135                 if (evt == NULL) {
1136                         spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1137                         sdev_printk(KERN_ERR, cmd->device,
1138                                 "failed to allocate reset event\n");
1139                         return FAILED;
1140                 }
1141
1142                 init_event_struct(evt,
1143                                   sync_completion,
1144                                   VIOSRP_SRP_FORMAT,
1145                                   init_timeout);
1146
1147                 tsk_mgmt = &evt->iu.srp.tsk_mgmt;
1148
1149                 /* Set up a lun reset SRP command */
1150                 memset(tsk_mgmt, 0x00, sizeof(*tsk_mgmt));
1151                 tsk_mgmt->opcode = SRP_TSK_MGMT;
1152                 tsk_mgmt->lun = ((u64) lun) << 48;
1153                 tsk_mgmt->tsk_mgmt_func = SRP_TSK_LUN_RESET;
1154
1155                 evt->sync_srp = &srp_rsp;
1156
1157                 init_completion(&evt->comp);
1158                 rsp_rc = ibmvscsi_send_srp_event(evt, hostdata, init_timeout * 2);
1159
1160                 if (rsp_rc != SCSI_MLQUEUE_HOST_BUSY)
1161                         break;
1162
1163                 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1164                 msleep(10);
1165                 spin_lock_irqsave(hostdata->host->host_lock, flags);
1166         } while (time_before(jiffies, wait_switch));
1167
1168         spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1169
1170         if (rsp_rc != 0) {
1171                 sdev_printk(KERN_ERR, cmd->device,
1172                             "failed to send reset event. rc=%d\n", rsp_rc);
1173                 return FAILED;
1174         }
1175
1176         sdev_printk(KERN_INFO, cmd->device, "resetting device. lun 0x%lx\n",
1177                     (((u64) lun) << 48));
1178
1179         wait_for_completion(&evt->comp);
1180
1181         /* make sure we got a good response */
1182         if (unlikely(srp_rsp.srp.rsp.opcode != SRP_RSP)) {
1183                 if (printk_ratelimit())
1184                         sdev_printk(KERN_WARNING, cmd->device, "reset bad SRP RSP type %d\n",
1185                                     srp_rsp.srp.rsp.opcode);
1186                 return FAILED;
1187         }
1188
1189         if (srp_rsp.srp.rsp.flags & SRP_RSP_FLAG_RSPVALID)
1190                 rsp_rc = *((int *)srp_rsp.srp.rsp.data);
1191         else
1192                 rsp_rc = srp_rsp.srp.rsp.status;
1193
1194         if (rsp_rc) {
1195                 if (printk_ratelimit())
1196                         sdev_printk(KERN_WARNING, cmd->device,
1197                                     "reset code %d for task tag 0x%lx\n",
1198                                     rsp_rc, tsk_mgmt->task_tag);
1199                 return FAILED;
1200         }
1201
1202         /* We need to find all commands for this LUN that have not yet been
1203          * responded to, and fail them with DID_RESET
1204          */
1205         spin_lock_irqsave(hostdata->host->host_lock, flags);
1206         list_for_each_entry_safe(tmp_evt, pos, &hostdata->sent, list) {
1207                 if ((tmp_evt->cmnd) && (tmp_evt->cmnd->device == cmd->device)) {
1208                         if (tmp_evt->cmnd)
1209                                 tmp_evt->cmnd->result = (DID_RESET << 16);
1210                         list_del(&tmp_evt->list);
1211                         unmap_cmd_data(&tmp_evt->iu.srp.cmd, tmp_evt,
1212                                        tmp_evt->hostdata->dev);
1213                         free_event_struct(&tmp_evt->hostdata->pool,
1214                                                    tmp_evt);
1215                         atomic_inc(&hostdata->request_limit);
1216                         if (tmp_evt->cmnd_done)
1217                                 tmp_evt->cmnd_done(tmp_evt->cmnd);
1218                         else if (tmp_evt->done)
1219                                 tmp_evt->done(tmp_evt);
1220                 }
1221         }
1222         spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1223         return SUCCESS;
1224 }
1225
1226 /**
1227  * ibmvscsi_eh_host_reset_handler - Reset the connection to the server
1228  * @cmd:        struct scsi_cmnd having problems
1229 */
1230 static int ibmvscsi_eh_host_reset_handler(struct scsi_cmnd *cmd)
1231 {
1232         unsigned long wait_switch = 0;
1233         struct ibmvscsi_host_data *hostdata = shost_priv(cmd->device->host);
1234
1235         dev_err(hostdata->dev, "Resetting connection due to error recovery\n");
1236
1237         ibmvscsi_reset_host(hostdata);
1238
1239         for (wait_switch = jiffies + (init_timeout * HZ);
1240              time_before(jiffies, wait_switch) &&
1241                      atomic_read(&hostdata->request_limit) < 2;) {
1242
1243                 msleep(10);
1244         }
1245
1246         if (atomic_read(&hostdata->request_limit) <= 0)
1247                 return FAILED;
1248
1249         return SUCCESS;
1250 }
1251
1252 /**
1253  * ibmvscsi_handle_crq: - Handles and frees received events in the CRQ
1254  * @crq:        Command/Response queue
1255  * @hostdata:   ibmvscsi_host_data of host
1256  *
1257 */
1258 void ibmvscsi_handle_crq(struct viosrp_crq *crq,
1259                          struct ibmvscsi_host_data *hostdata)
1260 {
1261         long rc;
1262         unsigned long flags;
1263         struct srp_event_struct *evt_struct =
1264             (struct srp_event_struct *)crq->IU_data_ptr;
1265         switch (crq->valid) {
1266         case 0xC0:              /* initialization */
1267                 switch (crq->format) {
1268                 case 0x01:      /* Initialization message */
1269                         dev_info(hostdata->dev, "partner initialized\n");
1270                         /* Send back a response */
1271                         if ((rc = ibmvscsi_ops->send_crq(hostdata,
1272                                                          0xC002000000000000LL, 0)) == 0) {
1273                                 /* Now login */
1274                                 send_srp_login(hostdata);
1275                         } else {
1276                                 dev_err(hostdata->dev, "Unable to send init rsp. rc=%ld\n", rc);
1277                         }
1278
1279                         break;
1280                 case 0x02:      /* Initialization response */
1281                         dev_info(hostdata->dev, "partner initialization complete\n");
1282
1283                         /* Now login */
1284                         send_srp_login(hostdata);
1285                         break;
1286                 default:
1287                         dev_err(hostdata->dev, "unknown crq message type: %d\n", crq->format);
1288                 }
1289                 return;
1290         case 0xFF:      /* Hypervisor telling us the connection is closed */
1291                 scsi_block_requests(hostdata->host);
1292                 atomic_set(&hostdata->request_limit, 0);
1293                 if (crq->format == 0x06) {
1294                         /* We need to re-setup the interpartition connection */
1295                         dev_info(hostdata->dev, "Re-enabling adapter!\n");
1296                         purge_requests(hostdata, DID_REQUEUE);
1297                         if ((ibmvscsi_ops->reenable_crq_queue(&hostdata->queue,
1298                                                               hostdata)) ||
1299                             (ibmvscsi_ops->send_crq(hostdata,
1300                                                     0xC001000000000000LL, 0))) {
1301                                         atomic_set(&hostdata->request_limit,
1302                                                    -1);
1303                                         dev_err(hostdata->dev, "error after enable\n");
1304                         }
1305                 } else {
1306                         dev_err(hostdata->dev, "Virtual adapter failed rc %d!\n",
1307                                 crq->format);
1308
1309                         purge_requests(hostdata, DID_ERROR);
1310                         if ((ibmvscsi_ops->reset_crq_queue(&hostdata->queue,
1311                                                            hostdata)) ||
1312                             (ibmvscsi_ops->send_crq(hostdata,
1313                                                     0xC001000000000000LL, 0))) {
1314                                         atomic_set(&hostdata->request_limit,
1315                                                    -1);
1316                                         dev_err(hostdata->dev, "error after reset\n");
1317                         }
1318                 }
1319                 scsi_unblock_requests(hostdata->host);
1320                 return;
1321         case 0x80:              /* real payload */
1322                 break;
1323         default:
1324                 dev_err(hostdata->dev, "got an invalid message type 0x%02x\n",
1325                         crq->valid);
1326                 return;
1327         }
1328
1329         /* The only kind of payload CRQs we should get are responses to
1330          * things we send. Make sure this response is to something we
1331          * actually sent
1332          */
1333         if (!valid_event_struct(&hostdata->pool, evt_struct)) {
1334                 dev_err(hostdata->dev, "returned correlation_token 0x%p is invalid!\n",
1335                        (void *)crq->IU_data_ptr);
1336                 return;
1337         }
1338
1339         if (atomic_read(&evt_struct->free)) {
1340                 dev_err(hostdata->dev, "received duplicate correlation_token 0x%p!\n",
1341                         (void *)crq->IU_data_ptr);
1342                 return;
1343         }
1344
1345         if (crq->format == VIOSRP_SRP_FORMAT)
1346                 atomic_add(evt_struct->xfer_iu->srp.rsp.req_lim_delta,
1347                            &hostdata->request_limit);
1348
1349         del_timer(&evt_struct->timer);
1350
1351         if (crq->status != VIOSRP_OK && evt_struct->cmnd)
1352                 evt_struct->cmnd->result = DID_ERROR << 16;
1353         if (evt_struct->done)
1354                 evt_struct->done(evt_struct);
1355         else
1356                 dev_err(hostdata->dev, "returned done() is NULL; not running it!\n");
1357
1358         /*
1359          * Lock the host_lock before messing with these structures, since we
1360          * are running in a task context
1361          */
1362         spin_lock_irqsave(evt_struct->hostdata->host->host_lock, flags);
1363         list_del(&evt_struct->list);
1364         free_event_struct(&evt_struct->hostdata->pool, evt_struct);
1365         spin_unlock_irqrestore(evt_struct->hostdata->host->host_lock, flags);
1366 }
1367
1368 /**
1369  * ibmvscsi_get_host_config: Send the command to the server to get host
1370  * configuration data.  The data is opaque to us.
1371  */
1372 static int ibmvscsi_do_host_config(struct ibmvscsi_host_data *hostdata,
1373                                    unsigned char *buffer, int length)
1374 {
1375         struct viosrp_host_config *host_config;
1376         struct srp_event_struct *evt_struct;
1377         unsigned long flags;
1378         dma_addr_t addr;
1379         int rc;
1380
1381         evt_struct = get_event_struct(&hostdata->pool);
1382         if (!evt_struct) {
1383                 dev_err(hostdata->dev, "couldn't allocate event for HOST_CONFIG!\n");
1384                 return -1;
1385         }
1386
1387         init_event_struct(evt_struct,
1388                           sync_completion,
1389                           VIOSRP_MAD_FORMAT,
1390                           init_timeout);
1391
1392         host_config = &evt_struct->iu.mad.host_config;
1393
1394         /* Set up a lun reset SRP command */
1395         memset(host_config, 0x00, sizeof(*host_config));
1396         host_config->common.type = VIOSRP_HOST_CONFIG_TYPE;
1397         host_config->common.length = length;
1398         host_config->buffer = addr = dma_map_single(hostdata->dev, buffer,
1399                                                     length,
1400                                                     DMA_BIDIRECTIONAL);
1401
1402         if (dma_mapping_error(host_config->buffer)) {
1403                 dev_err(hostdata->dev, "dma_mapping error getting host config\n");
1404                 free_event_struct(&hostdata->pool, evt_struct);
1405                 return -1;
1406         }
1407
1408         init_completion(&evt_struct->comp);
1409         spin_lock_irqsave(hostdata->host->host_lock, flags);
1410         rc = ibmvscsi_send_srp_event(evt_struct, hostdata, init_timeout * 2);
1411         spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1412         if (rc == 0)
1413                 wait_for_completion(&evt_struct->comp);
1414         dma_unmap_single(hostdata->dev, addr, length, DMA_BIDIRECTIONAL);
1415
1416         return rc;
1417 }
1418
1419 /**
1420  * ibmvscsi_slave_configure: Set the "allow_restart" flag for each disk.
1421  * @sdev:       struct scsi_device device to configure
1422  *
1423  * Enable allow_restart for a device if it is a disk.  Adjust the
1424  * queue_depth here also as is required by the documentation for
1425  * struct scsi_host_template.
1426  */
1427 static int ibmvscsi_slave_configure(struct scsi_device *sdev)
1428 {
1429         struct Scsi_Host *shost = sdev->host;
1430         unsigned long lock_flags = 0;
1431
1432         spin_lock_irqsave(shost->host_lock, lock_flags);
1433         if (sdev->type == TYPE_DISK) {
1434                 sdev->allow_restart = 1;
1435                 sdev->timeout = 60 * HZ;
1436         }
1437         scsi_adjust_queue_depth(sdev, 0, shost->cmd_per_lun);
1438         spin_unlock_irqrestore(shost->host_lock, lock_flags);
1439         return 0;
1440 }
1441
1442 /**
1443  * ibmvscsi_change_queue_depth - Change the device's queue depth
1444  * @sdev:       scsi device struct
1445  * @qdepth:     depth to set
1446  *
1447  * Return value:
1448  *      actual depth set
1449  **/
1450 static int ibmvscsi_change_queue_depth(struct scsi_device *sdev, int qdepth)
1451 {
1452         if (qdepth > IBMVSCSI_MAX_CMDS_PER_LUN)
1453                 qdepth = IBMVSCSI_MAX_CMDS_PER_LUN;
1454
1455         scsi_adjust_queue_depth(sdev, 0, qdepth);
1456         return sdev->queue_depth;
1457 }
1458
1459 /* ------------------------------------------------------------
1460  * sysfs attributes
1461  */
1462 static ssize_t show_host_srp_version(struct device *dev,
1463                                      struct device_attribute *attr, char *buf)
1464 {
1465         struct Scsi_Host *shost = class_to_shost(dev);
1466         struct ibmvscsi_host_data *hostdata = shost_priv(shost);
1467         int len;
1468
1469         len = snprintf(buf, PAGE_SIZE, "%s\n",
1470                        hostdata->madapter_info.srp_version);
1471         return len;
1472 }
1473
1474 static struct device_attribute ibmvscsi_host_srp_version = {
1475         .attr = {
1476                  .name = "srp_version",
1477                  .mode = S_IRUGO,
1478                  },
1479         .show = show_host_srp_version,
1480 };
1481
1482 static ssize_t show_host_partition_name(struct device *dev,
1483                                         struct device_attribute *attr,
1484                                         char *buf)
1485 {
1486         struct Scsi_Host *shost = class_to_shost(dev);
1487         struct ibmvscsi_host_data *hostdata = shost_priv(shost);
1488         int len;
1489
1490         len = snprintf(buf, PAGE_SIZE, "%s\n",
1491                        hostdata->madapter_info.partition_name);
1492         return len;
1493 }
1494
1495 static struct device_attribute ibmvscsi_host_partition_name = {
1496         .attr = {
1497                  .name = "partition_name",
1498                  .mode = S_IRUGO,
1499                  },
1500         .show = show_host_partition_name,
1501 };
1502
1503 static ssize_t show_host_partition_number(struct device *dev,
1504                                           struct device_attribute *attr,
1505                                           char *buf)
1506 {
1507         struct Scsi_Host *shost = class_to_shost(dev);
1508         struct ibmvscsi_host_data *hostdata = shost_priv(shost);
1509         int len;
1510
1511         len = snprintf(buf, PAGE_SIZE, "%d\n",
1512                        hostdata->madapter_info.partition_number);
1513         return len;
1514 }
1515
1516 static struct device_attribute ibmvscsi_host_partition_number = {
1517         .attr = {
1518                  .name = "partition_number",
1519                  .mode = S_IRUGO,
1520                  },
1521         .show = show_host_partition_number,
1522 };
1523
1524 static ssize_t show_host_mad_version(struct device *dev,
1525                                      struct device_attribute *attr, char *buf)
1526 {
1527         struct Scsi_Host *shost = class_to_shost(dev);
1528         struct ibmvscsi_host_data *hostdata = shost_priv(shost);
1529         int len;
1530
1531         len = snprintf(buf, PAGE_SIZE, "%d\n",
1532                        hostdata->madapter_info.mad_version);
1533         return len;
1534 }
1535
1536 static struct device_attribute ibmvscsi_host_mad_version = {
1537         .attr = {
1538                  .name = "mad_version",
1539                  .mode = S_IRUGO,
1540                  },
1541         .show = show_host_mad_version,
1542 };
1543
1544 static ssize_t show_host_os_type(struct device *dev,
1545                                  struct device_attribute *attr, char *buf)
1546 {
1547         struct Scsi_Host *shost = class_to_shost(dev);
1548         struct ibmvscsi_host_data *hostdata = shost_priv(shost);
1549         int len;
1550
1551         len = snprintf(buf, PAGE_SIZE, "%d\n", hostdata->madapter_info.os_type);
1552         return len;
1553 }
1554
1555 static struct device_attribute ibmvscsi_host_os_type = {
1556         .attr = {
1557                  .name = "os_type",
1558                  .mode = S_IRUGO,
1559                  },
1560         .show = show_host_os_type,
1561 };
1562
1563 static ssize_t show_host_config(struct device *dev,
1564                                 struct device_attribute *attr, char *buf)
1565 {
1566         struct Scsi_Host *shost = class_to_shost(dev);
1567         struct ibmvscsi_host_data *hostdata = shost_priv(shost);
1568
1569         /* returns null-terminated host config data */
1570         if (ibmvscsi_do_host_config(hostdata, buf, PAGE_SIZE) == 0)
1571                 return strlen(buf);
1572         else
1573                 return 0;
1574 }
1575
1576 static struct device_attribute ibmvscsi_host_config = {
1577         .attr = {
1578                  .name = "config",
1579                  .mode = S_IRUGO,
1580                  },
1581         .show = show_host_config,
1582 };
1583
1584 static struct device_attribute *ibmvscsi_attrs[] = {
1585         &ibmvscsi_host_srp_version,
1586         &ibmvscsi_host_partition_name,
1587         &ibmvscsi_host_partition_number,
1588         &ibmvscsi_host_mad_version,
1589         &ibmvscsi_host_os_type,
1590         &ibmvscsi_host_config,
1591         NULL
1592 };
1593
1594 /* ------------------------------------------------------------
1595  * SCSI driver registration
1596  */
1597 static struct scsi_host_template driver_template = {
1598         .module = THIS_MODULE,
1599         .name = "IBM POWER Virtual SCSI Adapter " IBMVSCSI_VERSION,
1600         .proc_name = "ibmvscsi",
1601         .queuecommand = ibmvscsi_queuecommand,
1602         .eh_abort_handler = ibmvscsi_eh_abort_handler,
1603         .eh_device_reset_handler = ibmvscsi_eh_device_reset_handler,
1604         .eh_host_reset_handler = ibmvscsi_eh_host_reset_handler,
1605         .slave_configure = ibmvscsi_slave_configure,
1606         .change_queue_depth = ibmvscsi_change_queue_depth,
1607         .cmd_per_lun = 16,
1608         .can_queue = IBMVSCSI_MAX_REQUESTS_DEFAULT,
1609         .this_id = -1,
1610         .sg_tablesize = SG_ALL,
1611         .use_clustering = ENABLE_CLUSTERING,
1612         .shost_attrs = ibmvscsi_attrs,
1613 };
1614
1615 /**
1616  * Called by bus code for each adapter
1617  */
1618 static int ibmvscsi_probe(struct vio_dev *vdev, const struct vio_device_id *id)
1619 {
1620         struct ibmvscsi_host_data *hostdata;
1621         struct Scsi_Host *host;
1622         struct device *dev = &vdev->dev;
1623         struct srp_rport_identifiers ids;
1624         struct srp_rport *rport;
1625         unsigned long wait_switch = 0;
1626         int rc;
1627
1628         vdev->dev.driver_data = NULL;
1629
1630         driver_template.can_queue = max_requests;
1631         host = scsi_host_alloc(&driver_template, sizeof(*hostdata));
1632         if (!host) {
1633                 dev_err(&vdev->dev, "couldn't allocate host data\n");
1634                 goto scsi_host_alloc_failed;
1635         }
1636
1637         host->transportt = ibmvscsi_transport_template;
1638         hostdata = shost_priv(host);
1639         memset(hostdata, 0x00, sizeof(*hostdata));
1640         INIT_LIST_HEAD(&hostdata->sent);
1641         hostdata->host = host;
1642         hostdata->dev = dev;
1643         atomic_set(&hostdata->request_limit, -1);
1644         hostdata->host->max_sectors = 32 * 8; /* default max I/O 32 pages */
1645
1646         rc = ibmvscsi_ops->init_crq_queue(&hostdata->queue, hostdata, max_requests);
1647         if (rc != 0 && rc != H_RESOURCE) {
1648                 dev_err(&vdev->dev, "couldn't initialize crq. rc=%d\n", rc);
1649                 goto init_crq_failed;
1650         }
1651         if (initialize_event_pool(&hostdata->pool, max_requests, hostdata) != 0) {
1652                 dev_err(&vdev->dev, "couldn't initialize event pool\n");
1653                 goto init_pool_failed;
1654         }
1655
1656         host->max_lun = 8;
1657         host->max_id = max_id;
1658         host->max_channel = max_channel;
1659
1660         if (scsi_add_host(hostdata->host, hostdata->dev))
1661                 goto add_host_failed;
1662
1663         /* we don't have a proper target_port_id so let's use the fake one */
1664         memcpy(ids.port_id, hostdata->madapter_info.partition_name,
1665                sizeof(ids.port_id));
1666         ids.roles = SRP_RPORT_ROLE_TARGET;
1667         rport = srp_rport_add(host, &ids);
1668         if (IS_ERR(rport))
1669                 goto add_srp_port_failed;
1670
1671         /* Try to send an initialization message.  Note that this is allowed
1672          * to fail if the other end is not acive.  In that case we don't
1673          * want to scan
1674          */
1675         if (ibmvscsi_ops->send_crq(hostdata, 0xC001000000000000LL, 0) == 0
1676             || rc == H_RESOURCE) {
1677                 /*
1678                  * Wait around max init_timeout secs for the adapter to finish
1679                  * initializing. When we are done initializing, we will have a
1680                  * valid request_limit.  We don't want Linux scanning before
1681                  * we are ready.
1682                  */
1683                 for (wait_switch = jiffies + (init_timeout * HZ);
1684                      time_before(jiffies, wait_switch) &&
1685                      atomic_read(&hostdata->request_limit) < 2;) {
1686
1687                         msleep(10);
1688                 }
1689
1690                 /* if we now have a valid request_limit, initiate a scan */
1691                 if (atomic_read(&hostdata->request_limit) > 0)
1692                         scsi_scan_host(host);
1693         }
1694
1695         vdev->dev.driver_data = hostdata;
1696         return 0;
1697
1698       add_srp_port_failed:
1699         scsi_remove_host(hostdata->host);
1700       add_host_failed:
1701         release_event_pool(&hostdata->pool, hostdata);
1702       init_pool_failed:
1703         ibmvscsi_ops->release_crq_queue(&hostdata->queue, hostdata, max_requests);
1704       init_crq_failed:
1705         scsi_host_put(host);
1706       scsi_host_alloc_failed:
1707         return -1;
1708 }
1709
1710 static int ibmvscsi_remove(struct vio_dev *vdev)
1711 {
1712         struct ibmvscsi_host_data *hostdata = vdev->dev.driver_data;
1713         release_event_pool(&hostdata->pool, hostdata);
1714         ibmvscsi_ops->release_crq_queue(&hostdata->queue, hostdata,
1715                                         max_requests);
1716
1717         srp_remove_host(hostdata->host);
1718         scsi_remove_host(hostdata->host);
1719         scsi_host_put(hostdata->host);
1720
1721         return 0;
1722 }
1723
1724 /**
1725  * ibmvscsi_device_table: Used by vio.c to match devices in the device tree we
1726  * support.
1727  */
1728 static struct vio_device_id ibmvscsi_device_table[] __devinitdata = {
1729         {"vscsi", "IBM,v-scsi"},
1730         { "", "" }
1731 };
1732 MODULE_DEVICE_TABLE(vio, ibmvscsi_device_table);
1733
1734 static struct vio_driver ibmvscsi_driver = {
1735         .id_table = ibmvscsi_device_table,
1736         .probe = ibmvscsi_probe,
1737         .remove = ibmvscsi_remove,
1738         .driver = {
1739                 .name = "ibmvscsi",
1740                 .owner = THIS_MODULE,
1741         }
1742 };
1743
1744 static struct srp_function_template ibmvscsi_transport_functions = {
1745 };
1746
1747 int __init ibmvscsi_module_init(void)
1748 {
1749         int ret;
1750
1751         if (firmware_has_feature(FW_FEATURE_ISERIES))
1752                 ibmvscsi_ops = &iseriesvscsi_ops;
1753         else if (firmware_has_feature(FW_FEATURE_VIO))
1754                 ibmvscsi_ops = &rpavscsi_ops;
1755         else
1756                 return -ENODEV;
1757
1758         ibmvscsi_transport_template =
1759                 srp_attach_transport(&ibmvscsi_transport_functions);
1760         if (!ibmvscsi_transport_template)
1761                 return -ENOMEM;
1762
1763         ret = vio_register_driver(&ibmvscsi_driver);
1764         if (ret)
1765                 srp_release_transport(ibmvscsi_transport_template);
1766         return ret;
1767 }
1768
1769 void __exit ibmvscsi_module_exit(void)
1770 {
1771         vio_unregister_driver(&ibmvscsi_driver);
1772         srp_release_transport(ibmvscsi_transport_template);
1773 }
1774
1775 module_init(ibmvscsi_module_init);
1776 module_exit(ibmvscsi_module_exit);