kernel/drivers/scsi/esas2r/esas2r_int.c

   1 /*
   2  *  linux/drivers/scsi/esas2r/esas2r_int.c
   3  *      esas2r interrupt handling
   4  *
   5  *  Copyright (c) 2001-2013 ATTO Technology, Inc.
   6  *  (mailto:linuxdrivers@attotech.com)
   7  */
   8 /*=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=*/
   9 /*
  10  *  This program is free software; you can redistribute it and/or modify
  11  *  it under the terms of the GNU General Public License as published by
  12  *  the Free Software Foundation; version 2 of the License.
  13  *
  14  *  This program is distributed in the hope that it will be useful,
  15  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  *  GNU General Public License for more details.
  18  *
  19  *  NO WARRANTY
  20  *  THE PROGRAM IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OR
  21  *  CONDITIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED INCLUDING, WITHOUT
  22  *  LIMITATION, ANY WARRANTIES OR CONDITIONS OF TITLE, NON-INFRINGEMENT,
  23  *  MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. Each Recipient is
  24  *  solely responsible for determining the appropriateness of using and
  25  *  distributing the Program and assumes all risks associated with its
  26  *  exercise of rights under this Agreement, including but not limited to
  27  *  the risks and costs of program errors, damage to or loss of data,
  28  *  programs or equipment, and unavailability or interruption of operations.
  29  *
  30  *  DISCLAIMER OF LIABILITY
  31  *  NEITHER RECIPIENT NOR ANY CONTRIBUTORS SHALL HAVE ANY LIABILITY FOR ANY
  32  *  DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  33  *  DAMAGES (INCLUDING WITHOUT LIMITATION LOST PROFITS), HOWEVER CAUSED AND
  34  *  ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
  35  *  TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
  36  *  USE OR DISTRIBUTION OF THE PROGRAM OR THE EXERCISE OF ANY RIGHTS GRANTED
  37  *  HEREUNDER, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGES
  38  *
  39  *  You should have received a copy of the GNU General Public License
  40  *  along with this program; if not, write to the Free Software
  41  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  42  */
  43 /*=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=*/
  44
  45 #include "esas2r.h"
  46
  47 /* Local function prototypes */
  48 static void esas2r_doorbell_interrupt(struct esas2r_adapter *a, u32 doorbell);
  49 static void esas2r_get_outbound_responses(struct esas2r_adapter *a);
  50 static void esas2r_process_bus_reset(struct esas2r_adapter *a);
  51
  52 /*
  53  * Poll the adapter for interrupts and service them.
  54  * This function handles both legacy interrupts and MSI.
  55  */
  56 void esas2r_polled_interrupt(struct esas2r_adapter *a)
  57 {
  58         u32 intstat;
  59         u32 doorbell;
  60
  61         esas2r_disable_chip_interrupts(a);
  62
  63         intstat = esas2r_read_register_dword(a, MU_INT_STATUS_OUT);
  64
  65         if (intstat & MU_INTSTAT_POST_OUT) {
  66                 /* clear the interrupt */
  67
  68                 esas2r_write_register_dword(a, MU_OUT_LIST_INT_STAT,
  69                                             MU_OLIS_INT);
  70                 esas2r_flush_register_dword(a, MU_OUT_LIST_INT_STAT);
  71
  72                 esas2r_get_outbound_responses(a);
  73         }
  74
  75         if (intstat & MU_INTSTAT_DRBL) {
  76                 doorbell = esas2r_read_register_dword(a, MU_DOORBELL_OUT);
  77                 if (doorbell != 0)
  78                         esas2r_doorbell_interrupt(a, doorbell);
  79         }
  80
  81         esas2r_enable_chip_interrupts(a);
  82
  83         if (atomic_read(&a->disable_cnt) == 0)
  84                 esas2r_do_deferred_processes(a);
  85 }
  86
  87 /*
  88  * Legacy and MSI interrupt handlers.  Note that the legacy interrupt handler
  89  * schedules a TASKLET to process events, whereas the MSI handler just
  90  * processes interrupt events directly.
  91  */
  92 irqreturn_t esas2r_interrupt(int irq, void *dev_id)
  93 {
  94         struct esas2r_adapter *a = (struct esas2r_adapter *)dev_id;
  95
  96         if (!esas2r_adapter_interrupt_pending(a))
  97                 return IRQ_NONE;
  98
  99         set_bit(AF2_INT_PENDING, &a->flags2);
 100         esas2r_schedule_tasklet(a);
 101
 102         return IRQ_HANDLED;
 103 }
 104
 105 void esas2r_adapter_interrupt(struct esas2r_adapter *a)
 106 {
 107         u32 doorbell;
 108
 109         if (likely(a->int_stat & MU_INTSTAT_POST_OUT)) {
 110                 /* clear the interrupt */
 111                 esas2r_write_register_dword(a, MU_OUT_LIST_INT_STAT,
 112                                             MU_OLIS_INT);
 113                 esas2r_flush_register_dword(a, MU_OUT_LIST_INT_STAT);
 114                 esas2r_get_outbound_responses(a);
 115         }
 116
 117         if (unlikely(a->int_stat & MU_INTSTAT_DRBL)) {
 118                 doorbell = esas2r_read_register_dword(a, MU_DOORBELL_OUT);
 119                 if (doorbell != 0)
 120                         esas2r_doorbell_interrupt(a, doorbell);
 121         }
 122
 123         a->int_mask = ESAS2R_INT_STS_MASK;
 124
 125         esas2r_enable_chip_interrupts(a);
 126
 127         if (likely(atomic_read(&a->disable_cnt) == 0))
 128                 esas2r_do_deferred_processes(a);
 129 }
 130
 131 irqreturn_t esas2r_msi_interrupt(int irq, void *dev_id)
 132 {
 133         struct esas2r_adapter *a = (struct esas2r_adapter *)dev_id;
 134         u32 intstat;
 135         u32 doorbell;
 136
 137         intstat = esas2r_read_register_dword(a, MU_INT_STATUS_OUT);
 138
 139         if (likely(intstat & MU_INTSTAT_POST_OUT)) {
 140                 /* clear the interrupt */
 141
 142                 esas2r_write_register_dword(a, MU_OUT_LIST_INT_STAT,
 143                                             MU_OLIS_INT);
 144                 esas2r_flush_register_dword(a, MU_OUT_LIST_INT_STAT);
 145
 146                 esas2r_get_outbound_responses(a);
 147         }
 148
 149         if (unlikely(intstat & MU_INTSTAT_DRBL)) {
 150                 doorbell = esas2r_read_register_dword(a, MU_DOORBELL_OUT);
 151                 if (doorbell != 0)
 152                         esas2r_doorbell_interrupt(a, doorbell);
 153         }
 154
 155         /*
 156          * Work around a chip bug and force a new MSI to be sent if one is
 157          * still pending.
 158          */
 159         esas2r_disable_chip_interrupts(a);
 160         esas2r_enable_chip_interrupts(a);
 161
 162         if (likely(atomic_read(&a->disable_cnt) == 0))
 163                 esas2r_do_deferred_processes(a);
 164
 165         esas2r_do_tasklet_tasks(a);
 166
 167         return 1;
 168 }
 169
 170
 171
 172 static void esas2r_handle_outbound_rsp_err(struct esas2r_adapter *a,
 173                                            struct esas2r_request *rq,
 174                                            struct atto_vda_ob_rsp *rsp)
 175 {
 176
 177         /*
 178          * For I/O requests, only copy the response if an error
 179          * occurred and setup a callback to do error processing.
 180          */
 181         if (unlikely(rq->req_stat != RS_SUCCESS)) {
 182                 memcpy(&rq->func_rsp, &rsp->func_rsp, sizeof(rsp->func_rsp));
 183
 184                 if (rq->req_stat == RS_ABORTED) {
 185                         if (rq->timeout > RQ_MAX_TIMEOUT)
 186                                 rq->req_stat = RS_TIMEOUT;
 187                 } else if (rq->req_stat == RS_SCSI_ERROR) {
 188                         u8 scsistatus = rq->func_rsp.scsi_rsp.scsi_stat;
 189
 190                         esas2r_trace("scsistatus: %x", scsistatus);
 191
 192                         /* Any of these are a good result. */
 193                         if (scsistatus == SAM_STAT_GOOD || scsistatus ==
 194                             SAM_STAT_CONDITION_MET || scsistatus ==
 195                             SAM_STAT_INTERMEDIATE || scsistatus ==
 196                             SAM_STAT_INTERMEDIATE_CONDITION_MET) {
 197                                 rq->req_stat = RS_SUCCESS;
 198                                 rq->func_rsp.scsi_rsp.scsi_stat =
 199                                         SAM_STAT_GOOD;
 200                         }
 201                 }
 202         }
 203 }
 204
 205 static void esas2r_get_outbound_responses(struct esas2r_adapter *a)
 206 {
 207         struct atto_vda_ob_rsp *rsp;
 208         u32 rspput_ptr;
 209         u32 rspget_ptr;
 210         struct esas2r_request *rq;
 211         u32 handle;
 212         unsigned long flags;
 213
 214         LIST_HEAD(comp_list);
 215
 216         esas2r_trace_enter();
 217
 218         spin_lock_irqsave(&a->queue_lock, flags);
 219
 220         /* Get the outbound limit and pointers */
 221         rspput_ptr = le32_to_cpu(*a->outbound_copy) & MU_OLC_WRT_PTR;
 222         rspget_ptr = a->last_read;
 223
 224         esas2r_trace("rspput_ptr: %x, rspget_ptr: %x", rspput_ptr, rspget_ptr);
 225
 226         /* If we don't have anything to process, get out */
 227         if (unlikely(rspget_ptr == rspput_ptr)) {
 228                 spin_unlock_irqrestore(&a->queue_lock, flags);
 229                 esas2r_trace_exit();
 230                 return;
 231         }
 232
 233         /* Make sure the firmware is healthy */
 234         if (unlikely(rspput_ptr >= a->list_size)) {
 235                 spin_unlock_irqrestore(&a->queue_lock, flags);
 236                 esas2r_bugon();
 237                 esas2r_local_reset_adapter(a);
 238                 esas2r_trace_exit();
 239                 return;
 240         }
 241
 242         do {
 243                 rspget_ptr++;
 244
 245                 if (rspget_ptr >= a->list_size)
 246                         rspget_ptr = 0;
 247
 248                 rsp = (struct atto_vda_ob_rsp *)a->outbound_list_md.virt_addr
 249                       + rspget_ptr;
 250
 251                 handle = rsp->handle;
 252
 253                 /* Verify the handle range */
 254                 if (unlikely(LOWORD(handle) == 0
 255                              || LOWORD(handle) > num_requests +
 256                              num_ae_requests + 1)) {
 257                         esas2r_bugon();
 258                         continue;
 259                 }
 260
 261                 /* Get the request for this handle */
 262                 rq = a->req_table[LOWORD(handle)];
 263
 264                 if (unlikely(rq == NULL || rq->vrq->scsi.handle != handle)) {
 265                         esas2r_bugon();
 266                         continue;
 267                 }
 268
 269                 list_del(&rq->req_list);
 270
 271                 /* Get the completion status */
 272                 rq->req_stat = rsp->req_stat;
 273
 274                 esas2r_trace("handle: %x", handle);
 275                 esas2r_trace("rq: %p", rq);
 276                 esas2r_trace("req_status: %x", rq->req_stat);
 277
 278                 if (likely(rq->vrq->scsi.function == VDA_FUNC_SCSI)) {
 279                         esas2r_handle_outbound_rsp_err(a, rq, rsp);
 280                 } else {
 281                         /*
 282                          * Copy the outbound completion struct for non-I/O
 283                          * requests.
 284                          */
 285                         memcpy(&rq->func_rsp, &rsp->func_rsp,
 286                                sizeof(rsp->func_rsp));
 287                 }
 288
 289                 /* Queue the request for completion. */
 290                 list_add_tail(&rq->comp_list, &comp_list);
 291
 292         } while (rspget_ptr != rspput_ptr);
 293
 294         a->last_read = rspget_ptr;
 295         spin_unlock_irqrestore(&a->queue_lock, flags);
 296
 297         esas2r_comp_list_drain(a, &comp_list);
 298         esas2r_trace_exit();
 299 }
 300
 301 /*
 302  * Perform all deferred processes for the adapter.  Deferred
 303  * processes can only be done while the current interrupt
 304  * disable_cnt for the adapter is zero.
 305  */
 306 void esas2r_do_deferred_processes(struct esas2r_adapter *a)
 307 {
 308         int startreqs = 2;
 309         struct esas2r_request *rq;
 310         unsigned long flags;
 311
 312         /*
 313          * startreqs is used to control starting requests
 314          * that are on the deferred queue
 315          *  = 0 - do not start any requests
 316          *  = 1 - can start discovery requests
 317          *  = 2 - can start any request
 318          */
 319
 320         if (test_bit(AF_CHPRST_PENDING, &a->flags) ||
 321             test_bit(AF_FLASHING, &a->flags))
 322                 startreqs = 0;
 323         else if (test_bit(AF_DISC_PENDING, &a->flags))
 324                 startreqs = 1;
 325
 326         atomic_inc(&a->disable_cnt);
 327
 328         /* Clear off the completed list to be processed later. */
 329
 330         if (esas2r_is_tasklet_pending(a)) {
 331                 esas2r_schedule_tasklet(a);
 332
 333                 startreqs = 0;
 334         }
 335
 336         /*
 337          * If we can start requests then traverse the defer queue
 338          * looking for requests to start or complete
 339          */
 340         if (startreqs && !list_empty(&a->defer_list)) {
 341                 LIST_HEAD(comp_list);
 342                 struct list_head *element, *next;
 343
 344                 spin_lock_irqsave(&a->queue_lock, flags);
 345
 346                 list_for_each_safe(element, next, &a->defer_list) {
 347                         rq = list_entry(element, struct esas2r_request,
 348                                         req_list);
 349
 350                         if (rq->req_stat != RS_PENDING) {
 351                                 list_del(element);
 352                                 list_add_tail(&rq->comp_list, &comp_list);
 353                         }
 354                         /*
 355                          * Process discovery and OS requests separately.  We
 356                          * can't hold up discovery requests when discovery is
 357                          * pending.  In general, there may be different sets of
 358                          * conditions for starting different types of requests.
 359                          */
 360                         else if (rq->req_type == RT_DISC_REQ) {
 361                                 list_del(element);
 362                                 esas2r_disc_local_start_request(a, rq);
 363                         } else if (startreqs == 2) {
 364                                 list_del(element);
 365                                 esas2r_local_start_request(a, rq);
 366
 367                                 /*
 368                                  * Flashing could have been set by last local
 369                                  * start
 370                                  */
 371                                 if (test_bit(AF_FLASHING, &a->flags))
 372                                         break;
 373                         }
 374                 }
 375
 376                 spin_unlock_irqrestore(&a->queue_lock, flags);
 377                 esas2r_comp_list_drain(a, &comp_list);
 378         }
 379
 380         atomic_dec(&a->disable_cnt);
 381 }
 382
 383 /*
 384  * Process an adapter reset (or one that is about to happen)
 385  * by making sure all outstanding requests are completed that
 386  * haven't been already.
 387  */
 388 void esas2r_process_adapter_reset(struct esas2r_adapter *a)
 389 {
 390         struct esas2r_request *rq = &a->general_req;
 391         unsigned long flags;
 392         struct esas2r_disc_context *dc;
 393
 394         LIST_HEAD(comp_list);
 395         struct list_head *element;
 396
 397         esas2r_trace_enter();
 398
 399         spin_lock_irqsave(&a->queue_lock, flags);
 400
 401         /* abort the active discovery, if any.   */
 402
 403         if (rq->interrupt_cx) {
 404                 dc = (struct esas2r_disc_context *)rq->interrupt_cx;
 405
 406                 dc->disc_evt = 0;
 407
 408                 clear_bit(AF_DISC_IN_PROG, &a->flags);
 409         }
 410
 411         /*
 412          * just clear the interrupt callback for now.  it will be dequeued if
 413          * and when we find it on the active queue and we don't want the
 414          * callback called.  also set the dummy completion callback in case we
 415          * were doing an I/O request.
 416          */
 417
 418         rq->interrupt_cx = NULL;
 419         rq->interrupt_cb = NULL;
 420
 421         rq->comp_cb = esas2r_dummy_complete;
 422
 423         /* Reset the read and write pointers */
 424
 425         *a->outbound_copy =
 426                 a->last_write =
 427                         a->last_read = a->list_size - 1;
 428
 429         set_bit(AF_COMM_LIST_TOGGLE, &a->flags);
 430
 431         /* Kill all the requests on the active list */
 432         list_for_each(element, &a->defer_list) {
 433                 rq = list_entry(element, struct esas2r_request, req_list);
 434
 435                 if (rq->req_stat == RS_STARTED)
 436                         if (esas2r_ioreq_aborted(a, rq, RS_ABORTED))
 437                                 list_add_tail(&rq->comp_list, &comp_list);
 438         }
 439
 440         spin_unlock_irqrestore(&a->queue_lock, flags);
 441         esas2r_comp_list_drain(a, &comp_list);
 442         esas2r_process_bus_reset(a);
 443         esas2r_trace_exit();
 444 }
 445
 446 static void esas2r_process_bus_reset(struct esas2r_adapter *a)
 447 {
 448         struct esas2r_request *rq;
 449         struct list_head *element;
 450         unsigned long flags;
 451
 452         LIST_HEAD(comp_list);
 453
 454         esas2r_trace_enter();
 455
 456         esas2r_hdebug("reset detected");
 457
 458         spin_lock_irqsave(&a->queue_lock, flags);
 459
 460         /* kill all the requests on the deferred queue */
 461         list_for_each(element, &a->defer_list) {
 462                 rq = list_entry(element, struct esas2r_request, req_list);
 463                 if (esas2r_ioreq_aborted(a, rq, RS_ABORTED))
 464                         list_add_tail(&rq->comp_list, &comp_list);
 465         }
 466
 467         spin_unlock_irqrestore(&a->queue_lock, flags);
 468
 469         esas2r_comp_list_drain(a, &comp_list);
 470
 471         if (atomic_read(&a->disable_cnt) == 0)
 472                 esas2r_do_deferred_processes(a);
 473
 474         clear_bit(AF_OS_RESET, &a->flags);
 475
 476         esas2r_trace_exit();
 477 }
 478
 479 static void esas2r_chip_rst_needed_during_tasklet(struct esas2r_adapter *a)
 480 {
 481
 482         clear_bit(AF_CHPRST_NEEDED, &a->flags);
 483         clear_bit(AF_BUSRST_NEEDED, &a->flags);
 484         clear_bit(AF_BUSRST_DETECTED, &a->flags);
 485         clear_bit(AF_BUSRST_PENDING, &a->flags);
 486         /*
 487          * Make sure we don't get attempt more than 3 resets
 488          * when the uptime between resets does not exceed one
 489          * minute.  This will stop any situation where there is
 490          * really something wrong with the hardware.  The way
 491          * this works is that we start with uptime ticks at 0.
 492          * Each time we do a reset, we add 20 seconds worth to
 493          * the count.  Each time a timer tick occurs, as long
 494          * as a chip reset is not pending, we decrement the
 495          * tick count.  If the uptime ticks ever gets to 60
 496          * seconds worth, we disable the adapter from that
 497          * point forward.  Three strikes, you're out.
 498          */
 499         if (!esas2r_is_adapter_present(a) || (a->chip_uptime >=
 500                                               ESAS2R_CHP_UPTIME_MAX)) {
 501                 esas2r_hdebug("*** adapter disabled ***");
 502
 503                 /*
 504                  * Ok, some kind of hard failure.  Make sure we
 505                  * exit this loop with chip interrupts
 506                  * permanently disabled so we don't lock up the
 507                  * entire system.  Also flag degraded mode to
 508                  * prevent the heartbeat from trying to recover.
 509                  */
 510
 511                 set_bit(AF_DEGRADED_MODE, &a->flags);
 512                 set_bit(AF_DISABLED, &a->flags);
 513                 clear_bit(AF_CHPRST_PENDING, &a->flags);
 514                 clear_bit(AF_DISC_PENDING, &a->flags);
 515
 516                 esas2r_disable_chip_interrupts(a);
 517                 a->int_mask = 0;
 518                 esas2r_process_adapter_reset(a);
 519
 520                 esas2r_log(ESAS2R_LOG_CRIT,
 521                            "Adapter disabled because of hardware failure");
 522         } else {
 523                 bool alrdyrst = test_and_set_bit(AF_CHPRST_STARTED, &a->flags);
 524
 525                 if (!alrdyrst)
 526                         /*
 527                          * Only disable interrupts if this is
 528                          * the first reset attempt.
 529                          */
 530                         esas2r_disable_chip_interrupts(a);
 531
 532                 if ((test_bit(AF_POWER_MGT, &a->flags)) &&
 533                     !test_bit(AF_FIRST_INIT, &a->flags) && !alrdyrst) {
 534                         /*
 535                          * Don't reset the chip on the first
 536                          * deferred power up attempt.
 537                          */
 538                 } else {
 539                         esas2r_hdebug("*** resetting chip ***");
 540                         esas2r_reset_chip(a);
 541                 }
 542
 543                 /* Kick off the reinitialization */
 544                 a->chip_uptime += ESAS2R_CHP_UPTIME_CNT;
 545                 a->chip_init_time = jiffies_to_msecs(jiffies);
 546                 if (!test_bit(AF_POWER_MGT, &a->flags)) {
 547                         esas2r_process_adapter_reset(a);
 548
 549                         if (!alrdyrst) {
 550                                 /* Remove devices now that I/O is cleaned up. */
 551                                 a->prev_dev_cnt =
 552                                         esas2r_targ_db_get_tgt_cnt(a);
 553                                 esas2r_targ_db_remove_all(a, false);
 554                         }
 555                 }
 556
 557                 a->int_mask = 0;
 558         }
 559 }
 560
 561 static void esas2r_handle_chip_rst_during_tasklet(struct esas2r_adapter *a)
 562 {
 563         while (test_bit(AF_CHPRST_DETECTED, &a->flags)) {
 564                 /*
 565                  * Balance the enable in esas2r_initadapter_hw.
 566                  * Esas2r_power_down already took care of it for power
 567                  * management.
 568                  */
 569                 if (!test_bit(AF_DEGRADED_MODE, &a->flags) &&
 570                     !test_bit(AF_POWER_MGT, &a->flags))
 571                         esas2r_disable_chip_interrupts(a);
 572
 573                 /* Reinitialize the chip. */
 574                 esas2r_check_adapter(a);
 575                 esas2r_init_adapter_hw(a, 0);
 576
 577                 if (test_bit(AF_CHPRST_NEEDED, &a->flags))
 578                         break;
 579
 580                 if (test_bit(AF_POWER_MGT, &a->flags)) {
 581                         /* Recovery from power management. */
 582                         if (test_bit(AF_FIRST_INIT, &a->flags)) {
 583                                 /* Chip reset during normal power up */
 584                                 esas2r_log(ESAS2R_LOG_CRIT,
 585                                            "The firmware was reset during a normal power-up sequence");
 586                         } else {
 587                                 /* Deferred power up complete. */
 588                                 clear_bit(AF_POWER_MGT, &a->flags);
 589                                 esas2r_send_reset_ae(a, true);
 590                         }
 591                 } else {
 592                         /* Recovery from online chip reset. */
 593                         if (test_bit(AF_FIRST_INIT, &a->flags)) {
 594                                 /* Chip reset during driver load */
 595                         } else {
 596                                 /* Chip reset after driver load */
 597                                 esas2r_send_reset_ae(a, false);
 598                         }
 599
 600                         esas2r_log(ESAS2R_LOG_CRIT,
 601                                    "Recovering from a chip reset while the chip was online");
 602                 }
 603
 604                 clear_bit(AF_CHPRST_STARTED, &a->flags);
 605                 esas2r_enable_chip_interrupts(a);
 606
 607                 /*
 608                  * Clear this flag last!  this indicates that the chip has been
 609                  * reset already during initialization.
 610                  */
 611                 clear_bit(AF_CHPRST_DETECTED, &a->flags);
 612         }
 613 }
 614
 615
 616 /* Perform deferred tasks when chip interrupts are disabled */
 617 void esas2r_do_tasklet_tasks(struct esas2r_adapter *a)
 618 {
 619
 620         if (test_bit(AF_CHPRST_NEEDED, &a->flags) ||
 621             test_bit(AF_CHPRST_DETECTED, &a->flags)) {
 622                 if (test_bit(AF_CHPRST_NEEDED, &a->flags))
 623                         esas2r_chip_rst_needed_during_tasklet(a);
 624
 625                 esas2r_handle_chip_rst_during_tasklet(a);
 626         }
 627
 628         if (test_bit(AF_BUSRST_NEEDED, &a->flags)) {
 629                 esas2r_hdebug("hard resetting bus");
 630
 631                 clear_bit(AF_BUSRST_NEEDED, &a->flags);
 632
 633                 if (test_bit(AF_FLASHING, &a->flags))
 634                         set_bit(AF_BUSRST_DETECTED, &a->flags);
 635                 else
 636                         esas2r_write_register_dword(a, MU_DOORBELL_IN,
 637                                                     DRBL_RESET_BUS);
 638         }
 639
 640         if (test_bit(AF_BUSRST_DETECTED, &a->flags)) {
 641                 esas2r_process_bus_reset(a);
 642
 643                 esas2r_log_dev(ESAS2R_LOG_WARN,
 644                                &(a->host->shost_gendev),
 645                                "scsi_report_bus_reset() called");
 646
 647                 scsi_report_bus_reset(a->host, 0);
 648
 649                 clear_bit(AF_BUSRST_DETECTED, &a->flags);
 650                 clear_bit(AF_BUSRST_PENDING, &a->flags);
 651
 652                 esas2r_log(ESAS2R_LOG_WARN, "Bus reset complete");
 653         }
 654
 655         if (test_bit(AF_PORT_CHANGE, &a->flags)) {
 656                 clear_bit(AF_PORT_CHANGE, &a->flags);
 657
 658                 esas2r_targ_db_report_changes(a);
 659         }
 660
 661         if (atomic_read(&a->disable_cnt) == 0)
 662                 esas2r_do_deferred_processes(a);
 663 }
 664
 665 static void esas2r_doorbell_interrupt(struct esas2r_adapter *a, u32 doorbell)
 666 {
 667         if (!(doorbell & DRBL_FORCE_INT)) {
 668                 esas2r_trace_enter();
 669                 esas2r_trace("doorbell: %x", doorbell);
 670         }
 671
 672         /* First clear the doorbell bits */
 673         esas2r_write_register_dword(a, MU_DOORBELL_OUT, doorbell);
 674
 675         if (doorbell & DRBL_RESET_BUS)
 676                 set_bit(AF_BUSRST_DETECTED, &a->flags);
 677
 678         if (doorbell & DRBL_FORCE_INT)
 679                 clear_bit(AF_HEARTBEAT, &a->flags);
 680
 681         if (doorbell & DRBL_PANIC_REASON_MASK) {
 682                 esas2r_hdebug("*** Firmware Panic ***");
 683                 esas2r_log(ESAS2R_LOG_CRIT, "The firmware has panicked");
 684         }
 685
 686         if (doorbell & DRBL_FW_RESET) {
 687                 set_bit(AF2_COREDUMP_AVAIL, &a->flags2);
 688                 esas2r_local_reset_adapter(a);
 689         }
 690
 691         if (!(doorbell & DRBL_FORCE_INT))
 692                 esas2r_trace_exit();
 693 }
 694
 695 void esas2r_force_interrupt(struct esas2r_adapter *a)
 696 {
 697         esas2r_write_register_dword(a, MU_DOORBELL_IN, DRBL_FORCE_INT |
 698                                     DRBL_DRV_VER);
 699 }
 700
 701
 702 static void esas2r_lun_event(struct esas2r_adapter *a, union atto_vda_ae *ae,
 703                              u16 target, u32 length)
 704 {
 705         struct esas2r_target *t = a->targetdb + target;
 706         u32 cplen = length;
 707         unsigned long flags;
 708
 709         if (cplen > sizeof(t->lu_event))
 710                 cplen = sizeof(t->lu_event);
 711
 712         esas2r_trace("ae->lu.dwevent: %x", ae->lu.dwevent);
 713         esas2r_trace("ae->lu.bystate: %x", ae->lu.bystate);
 714
 715         spin_lock_irqsave(&a->mem_lock, flags);
 716
 717         t->new_target_state = TS_INVALID;
 718
 719         if (ae->lu.dwevent  & VDAAE_LU_LOST) {
 720                 t->new_target_state = TS_NOT_PRESENT;
 721         } else {
 722                 switch (ae->lu.bystate) {
 723                 case VDAAE_LU_NOT_PRESENT:
 724                 case VDAAE_LU_OFFLINE:
 725                 case VDAAE_LU_DELETED:
 726                 case VDAAE_LU_FACTORY_DISABLED:
 727                         t->new_target_state = TS_NOT_PRESENT;
 728                         break;
 729
 730                 case VDAAE_LU_ONLINE:
 731                 case VDAAE_LU_DEGRADED:
 732                         t->new_target_state = TS_PRESENT;
 733                         break;
 734                 }
 735         }
 736
 737         if (t->new_target_state != TS_INVALID) {
 738                 memcpy(&t->lu_event, &ae->lu, cplen);
 739
 740                 esas2r_disc_queue_event(a, DCDE_DEV_CHANGE);
 741         }
 742
 743         spin_unlock_irqrestore(&a->mem_lock, flags);
 744 }
 745
 746
 747
 748 void esas2r_ae_complete(struct esas2r_adapter *a, struct esas2r_request *rq)
 749 {
 750         union atto_vda_ae *ae =
 751                 (union atto_vda_ae *)rq->vda_rsp_data->ae_data.event_data;
 752         u32 length = le32_to_cpu(rq->func_rsp.ae_rsp.length);
 753         union atto_vda_ae *last =
 754                 (union atto_vda_ae *)(rq->vda_rsp_data->ae_data.event_data
 755                                       + length);
 756
 757         esas2r_trace_enter();
 758         esas2r_trace("length: %d", length);
 759
 760         if (length > sizeof(struct atto_vda_ae_data)
 761             || (length & 3) != 0
 762             || length == 0) {
 763                 esas2r_log(ESAS2R_LOG_WARN,
 764                            "The AE request response length (%p) is too long: %d",
 765                            rq, length);
 766
 767                 esas2r_hdebug("aereq->length (0x%x) too long", length);
 768                 esas2r_bugon();
 769
 770                 last = ae;
 771         }
 772
 773         while (ae < last) {
 774                 u16 target;
 775
 776                 esas2r_trace("ae: %p", ae);
 777                 esas2r_trace("ae->hdr: %p", &(ae->hdr));
 778
 779                 length = ae->hdr.bylength;
 780
 781                 if (length > (u32)((u8 *)last - (u8 *)ae)
 782                     || (length & 3) != 0
 783                     || length == 0) {
 784                         esas2r_log(ESAS2R_LOG_CRIT,
 785                                    "the async event length is invalid (%p): %d",
 786                                    ae, length);
 787
 788                         esas2r_hdebug("ae->hdr.length (0x%x) invalid", length);
 789                         esas2r_bugon();
 790
 791                         break;
 792                 }
 793
 794                 esas2r_nuxi_ae_data(ae);
 795
 796                 esas2r_queue_fw_event(a, fw_event_vda_ae, ae,
 797                                       sizeof(union atto_vda_ae));
 798
 799                 switch (ae->hdr.bytype) {
 800                 case VDAAE_HDR_TYPE_RAID:
 801
 802                         if (ae->raid.dwflags & (VDAAE_GROUP_STATE
 803                                                 | VDAAE_RBLD_STATE
 804                                                 | VDAAE_MEMBER_CHG
 805                                                 | VDAAE_PART_CHG)) {
 806                                 esas2r_log(ESAS2R_LOG_INFO,
 807                                            "RAID event received - name:%s rebuild_state:%d group_state:%d",
 808                                            ae->raid.acname,
 809                                            ae->raid.byrebuild_state,
 810                                            ae->raid.bygroup_state);
 811                         }
 812
 813                         break;
 814
 815                 case VDAAE_HDR_TYPE_LU:
 816                         esas2r_log(ESAS2R_LOG_INFO,
 817                                    "LUN event received: event:%d target_id:%d LUN:%d state:%d",
 818                                    ae->lu.dwevent,
 819                                    ae->lu.id.tgtlun.wtarget_id,
 820                                    ae->lu.id.tgtlun.bylun,
 821                                    ae->lu.bystate);
 822
 823                         target = ae->lu.id.tgtlun.wtarget_id;
 824
 825                         if (target < ESAS2R_MAX_TARGETS)
 826                                 esas2r_lun_event(a, ae, target, length);
 827
 828                         break;
 829
 830                 case VDAAE_HDR_TYPE_DISK:
 831                         esas2r_log(ESAS2R_LOG_INFO, "Disk event received");
 832                         break;
 833
 834                 default:
 835
 836                         /* Silently ignore the rest and let the apps deal with
 837                          * them.
 838                          */
 839
 840                         break;
 841                 }
 842
 843                 ae = (union atto_vda_ae *)((u8 *)ae + length);
 844         }
 845
 846         /* Now requeue it. */
 847         esas2r_start_ae_request(a, rq);
 848         esas2r_trace_exit();
 849 }
 850
 851 /* Send an asynchronous event for a chip reset or power management. */
 852 void esas2r_send_reset_ae(struct esas2r_adapter *a, bool pwr_mgt)
 853 {
 854         struct atto_vda_ae_hdr ae;
 855
 856         if (pwr_mgt)
 857                 ae.bytype = VDAAE_HDR_TYPE_PWRMGT;
 858         else
 859                 ae.bytype = VDAAE_HDR_TYPE_RESET;
 860
 861         ae.byversion = VDAAE_HDR_VER_0;
 862         ae.byflags = 0;
 863         ae.bylength = (u8)sizeof(struct atto_vda_ae_hdr);
 864
 865         if (pwr_mgt)
 866                 esas2r_hdebug("*** sending power management AE ***");
 867         else
 868                 esas2r_hdebug("*** sending reset AE ***");
 869
 870         esas2r_queue_fw_event(a, fw_event_vda_ae, &ae,
 871                               sizeof(union atto_vda_ae));
 872 }
 873
 874 void esas2r_dummy_complete(struct esas2r_adapter *a, struct esas2r_request *rq)
 875 {}
 876
 877 static void esas2r_check_req_rsp_sense(struct esas2r_adapter *a,
 878                                        struct esas2r_request *rq)
 879 {
 880         u8 snslen, snslen2;
 881
 882         snslen = snslen2 = rq->func_rsp.scsi_rsp.sense_len;
 883
 884         if (snslen > rq->sense_len)
 885                 snslen = rq->sense_len;
 886
 887         if (snslen) {
 888                 if (rq->sense_buf)
 889                         memcpy(rq->sense_buf, rq->data_buf, snslen);
 890                 else
 891                         rq->sense_buf = (u8 *)rq->data_buf;
 892
 893                 /* See about possible sense data */
 894                 if (snslen2 > 0x0c) {
 895                         u8 *s = (u8 *)rq->data_buf;
 896
 897                         esas2r_trace_enter();
 898
 899                         /* Report LUNS data has changed */
 900                         if (s[0x0c] == 0x3f && s[0x0d] == 0x0E) {
 901                                 esas2r_trace("rq->target_id: %d",
 902                                              rq->target_id);
 903                                 esas2r_target_state_changed(a, rq->target_id,
 904                                                             TS_LUN_CHANGE);
 905                         }
 906
 907                         esas2r_trace("add_sense_key=%x", s[0x0c]);
 908                         esas2r_trace("add_sense_qual=%x", s[0x0d]);
 909                         esas2r_trace_exit();
 910                 }
 911         }
 912
 913         rq->sense_len = snslen;
 914 }
 915
 916
 917 void esas2r_complete_request(struct esas2r_adapter *a,
 918                              struct esas2r_request *rq)
 919 {
 920         if (rq->vrq->scsi.function == VDA_FUNC_FLASH
 921             && rq->vrq->flash.sub_func == VDA_FLASH_COMMIT)
 922                 clear_bit(AF_FLASHING, &a->flags);
 923
 924         /* See if we setup a callback to do special processing */
 925
 926         if (rq->interrupt_cb) {
 927                 (*rq->interrupt_cb)(a, rq);
 928
 929                 if (rq->req_stat == RS_PENDING) {
 930                         esas2r_start_request(a, rq);
 931                         return;
 932                 }
 933         }
 934
 935         if (likely(rq->vrq->scsi.function == VDA_FUNC_SCSI)
 936             && unlikely(rq->req_stat != RS_SUCCESS)) {
 937                 esas2r_check_req_rsp_sense(a, rq);
 938                 esas2r_log_request_failure(a, rq);
 939         }
 940
 941         (*rq->comp_cb)(a, rq);
 942 }