[SCSI] Initial Commit of qla4xxx
[sfrench/cifs-2.6.git] / drivers / scsi / qla4xxx / ql4_isr.c
1 /*
2  * QLogic iSCSI HBA Driver
3  * Copyright (c)  2003-2006 QLogic Corporation
4  *
5  * See LICENSE.qla4xxx for copyright and licensing details.
6  */
7
8 #include "ql4_def.h"
9
10 /**
11  * qla2x00_process_completed_request() - Process a Fast Post response.
12  * @ha: SCSI driver HA context
13  * @index: SRB index
14  **/
15 static void qla4xxx_process_completed_request(struct scsi_qla_host *ha,
16                                               uint32_t index)
17 {
18         struct srb *srb;
19
20         srb = qla4xxx_del_from_active_array(ha, index);
21         if (srb) {
22                 /* Save ISP completion status */
23                 srb->cmd->result = DID_OK << 16;
24                 qla4xxx_srb_compl(ha, srb);
25         } else {
26                 DEBUG2(printk("scsi%ld: Invalid ISP SCSI completion handle = "
27                               "%d\n", ha->host_no, index));
28                 set_bit(DPC_RESET_HA, &ha->dpc_flags);
29         }
30 }
31
32 /**
33  * qla4xxx_status_entry - processes status IOCBs
34  * @ha: Pointer to host adapter structure.
35  * @sts_entry: Pointer to status entry structure.
36  **/
37 static void qla4xxx_status_entry(struct scsi_qla_host *ha,
38                                  struct status_entry *sts_entry)
39 {
40         uint8_t scsi_status;
41         struct scsi_cmnd *cmd;
42         struct srb *srb;
43         struct ddb_entry *ddb_entry;
44         uint32_t residual;
45         uint16_t sensebytecnt;
46
47         if (sts_entry->completionStatus == SCS_COMPLETE &&
48             sts_entry->scsiStatus == 0) {
49                 qla4xxx_process_completed_request(ha,
50                                                   le32_to_cpu(sts_entry->
51                                                               handle));
52                 return;
53         }
54
55         srb = qla4xxx_del_from_active_array(ha, le32_to_cpu(sts_entry->handle));
56         if (!srb) {
57                 /* FIXMEdg: Don't we need to reset ISP in this case??? */
58                 DEBUG2(printk(KERN_WARNING "scsi%ld: %s: Status Entry invalid "
59                               "handle 0x%x, sp=%p. This cmd may have already "
60                               "been completed.\n", ha->host_no, __func__,
61                               le32_to_cpu(sts_entry->handle), srb));
62                 return;
63         }
64
65         cmd = srb->cmd;
66         if (cmd == NULL) {
67                 DEBUG2(printk("scsi%ld: %s: Command already returned back to "
68                               "OS pkt->handle=%d srb=%p srb->state:%d\n",
69                               ha->host_no, __func__, sts_entry->handle,
70                               srb, srb->state));
71                 dev_warn(&ha->pdev->dev, "Command is NULL:"
72                         " already returned to OS (srb=%p)\n", srb);
73                 return;
74         }
75
76         ddb_entry = srb->ddb;
77         if (ddb_entry == NULL) {
78                 cmd->result = DID_NO_CONNECT << 16;
79                 goto status_entry_exit;
80         }
81
82         residual = le32_to_cpu(sts_entry->residualByteCnt);
83
84         /* Translate ISP error to a Linux SCSI error. */
85         scsi_status = sts_entry->scsiStatus;
86         switch (sts_entry->completionStatus) {
87         case SCS_COMPLETE:
88                 if (scsi_status == 0) {
89                         cmd->result = DID_OK << 16;
90                         break;
91                 }
92
93                 if (sts_entry->iscsiFlags &
94                     (ISCSI_FLAG_RESIDUAL_OVER|ISCSI_FLAG_RESIDUAL_UNDER))
95                         cmd->resid = residual;
96
97                 cmd->result = DID_OK << 16 | scsi_status;
98
99                 if (scsi_status != SCSI_CHECK_CONDITION)
100                         break;
101
102                 /* Copy Sense Data into sense buffer. */
103                 memset(cmd->sense_buffer, 0, sizeof(cmd->sense_buffer));
104
105                 sensebytecnt = le16_to_cpu(sts_entry->senseDataByteCnt);
106                 if (sensebytecnt == 0)
107                         break;
108
109                 memcpy(cmd->sense_buffer, sts_entry->senseData,
110                        min(sensebytecnt,
111                            (uint16_t) sizeof(cmd->sense_buffer)));
112
113                 DEBUG2(printk("scsi%ld:%d:%d:%d: %s: sense key = %x, "
114                               "ASC/ASCQ = %02x/%02x\n", ha->host_no,
115                               cmd->device->channel, cmd->device->id,
116                               cmd->device->lun, __func__,
117                               sts_entry->senseData[2] & 0x0f,
118                               sts_entry->senseData[12],
119                               sts_entry->senseData[13]));
120
121                 srb->flags |= SRB_GOT_SENSE;
122                 break;
123
124         case SCS_INCOMPLETE:
125                 /* Always set the status to DID_ERROR, since
126                  * all conditions result in that status anyway */
127                 cmd->result = DID_ERROR << 16;
128                 break;
129
130         case SCS_RESET_OCCURRED:
131                 DEBUG2(printk("scsi%ld:%d:%d:%d: %s: Device RESET occurred\n",
132                               ha->host_no, cmd->device->channel,
133                               cmd->device->id, cmd->device->lun, __func__));
134
135                 cmd->result = DID_RESET << 16;
136                 break;
137
138         case SCS_ABORTED:
139                 DEBUG2(printk("scsi%ld:%d:%d:%d: %s: Abort occurred\n",
140                               ha->host_no, cmd->device->channel,
141                               cmd->device->id, cmd->device->lun, __func__));
142
143                 cmd->result = DID_RESET << 16;
144                 break;
145
146         case SCS_TIMEOUT:
147                 DEBUG2(printk(KERN_INFO "scsi%ld:%d:%d:%d: Timeout\n",
148                               ha->host_no, cmd->device->channel,
149                               cmd->device->id, cmd->device->lun));
150
151                 cmd->result = DID_BUS_BUSY << 16;
152
153                 /*
154                  * Mark device missing so that we won't continue to send
155                  * I/O to this device.  We should get a ddb state change
156                  * AEN soon.
157                  */
158                 if (atomic_read(&ddb_entry->state) == DDB_STATE_ONLINE)
159                         qla4xxx_mark_device_missing(ha, ddb_entry);
160                 break;
161
162         case SCS_DATA_UNDERRUN:
163         case SCS_DATA_OVERRUN:
164                 if (sts_entry->iscsiFlags & ISCSI_FLAG_RESIDUAL_OVER) {
165                         DEBUG2(printk("scsi%ld:%d:%d:%d: %s: " "Data overrun, "
166                                       "residual = 0x%x\n", ha->host_no,
167                                       cmd->device->channel, cmd->device->id,
168                                       cmd->device->lun, __func__, residual));
169
170                         cmd->result = DID_ERROR << 16;
171                         break;
172                 }
173
174                 if ((sts_entry->iscsiFlags & ISCSI_FLAG_RESIDUAL_UNDER) == 0) {
175                         /*
176                          * Firmware detected a SCSI transport underrun
177                          * condition
178                          */
179                         cmd->resid = residual;
180                         DEBUG2(printk("scsi%ld:%d:%d:%d: %s: UNDERRUN status "
181                                       "detected, xferlen = 0x%x, residual = "
182                                       "0x%x\n",
183                                       ha->host_no, cmd->device->channel,
184                                       cmd->device->id,
185                                       cmd->device->lun, __func__,
186                                       cmd->request_bufflen,
187                                       residual));
188                 }
189
190                 /*
191                  * If there is scsi_status, it takes precedense over
192                  * underflow condition.
193                  */
194                 if (scsi_status != 0) {
195                         cmd->result = DID_OK << 16 | scsi_status;
196
197                         if (scsi_status != SCSI_CHECK_CONDITION)
198                                 break;
199
200                         /* Copy Sense Data into sense buffer. */
201                         memset(cmd->sense_buffer, 0,
202                                sizeof(cmd->sense_buffer));
203
204                         sensebytecnt =
205                                 le16_to_cpu(sts_entry->senseDataByteCnt);
206                         if (sensebytecnt == 0)
207                                 break;
208
209                         memcpy(cmd->sense_buffer, sts_entry->senseData,
210                                min(sensebytecnt,
211                                    (uint16_t) sizeof(cmd->sense_buffer)));
212
213                         DEBUG2(printk("scsi%ld:%d:%d:%d: %s: sense key = %x, "
214                                       "ASC/ASCQ = %02x/%02x\n", ha->host_no,
215                                       cmd->device->channel, cmd->device->id,
216                                       cmd->device->lun, __func__,
217                                       sts_entry->senseData[2] & 0x0f,
218                                       sts_entry->senseData[12],
219                                       sts_entry->senseData[13]));
220                 } else {
221                         /*
222                          * If RISC reports underrun and target does not
223                          * report it then we must have a lost frame, so
224                          * tell upper layer to retry it by reporting a
225                          * bus busy.
226                          */
227                         if ((sts_entry->iscsiFlags &
228                              ISCSI_FLAG_RESIDUAL_UNDER) == 0) {
229                                 cmd->result = DID_BUS_BUSY << 16;
230                         } else if ((cmd->request_bufflen - residual) <
231                                    cmd->underflow) {
232                                 /*
233                                  * Handle mid-layer underflow???
234                                  *
235                                  * For kernels less than 2.4, the driver must
236                                  * return an error if an underflow is detected.
237                                  * For kernels equal-to and above 2.4, the
238                                  * mid-layer will appearantly handle the
239                                  * underflow by detecting the residual count --
240                                  * unfortunately, we do not see where this is
241                                  * actually being done.  In the interim, we
242                                  * will return DID_ERROR.
243                                  */
244                                 DEBUG2(printk("scsi%ld:%d:%d:%d: %s: "
245                                               "Mid-layer Data underrun, "
246                                               "xferlen = 0x%x, "
247                                               "residual = 0x%x\n", ha->host_no,
248                                               cmd->device->channel,
249                                               cmd->device->id,
250                                               cmd->device->lun, __func__,
251                                               cmd->request_bufflen, residual));
252
253                                 cmd->result = DID_ERROR << 16;
254                         } else {
255                                 cmd->result = DID_OK << 16;
256                         }
257                 }
258                 break;
259
260         case SCS_DEVICE_LOGGED_OUT:
261         case SCS_DEVICE_UNAVAILABLE:
262                 /*
263                  * Mark device missing so that we won't continue to
264                  * send I/O to this device.  We should get a ddb
265                  * state change AEN soon.
266                  */
267                 if (atomic_read(&ddb_entry->state) == DDB_STATE_ONLINE)
268                         qla4xxx_mark_device_missing(ha, ddb_entry);
269
270                 cmd->result = DID_BUS_BUSY << 16;
271                 break;
272
273         case SCS_QUEUE_FULL:
274                 /*
275                  * SCSI Mid-Layer handles device queue full
276                  */
277                 cmd->result = DID_OK << 16 | sts_entry->scsiStatus;
278                 DEBUG2(printk("scsi%ld:%d:%d: %s: QUEUE FULL detected "
279                               "compl=%02x, scsi=%02x, state=%02x, iFlags=%02x,"
280                               " iResp=%02x\n", ha->host_no, cmd->device->id,
281                               cmd->device->lun, __func__,
282                               sts_entry->completionStatus,
283                               sts_entry->scsiStatus, sts_entry->state_flags,
284                               sts_entry->iscsiFlags,
285                               sts_entry->iscsiResponse));
286                 break;
287
288         default:
289                 cmd->result = DID_ERROR << 16;
290                 break;
291         }
292
293 status_entry_exit:
294
295         /* complete the request */
296         srb->cc_stat = sts_entry->completionStatus;
297         qla4xxx_srb_compl(ha, srb);
298 }
299
300 /**
301  * qla4xxx_process_response_queue - process response queue completions
302  * @ha: Pointer to host adapter structure.
303  *
304  * This routine process response queue completions in interrupt context.
305  * Hardware_lock locked upon entry
306  **/
307 static void qla4xxx_process_response_queue(struct scsi_qla_host * ha)
308 {
309         uint32_t count = 0;
310         struct srb *srb = NULL;
311         struct status_entry *sts_entry;
312
313         /* Process all responses from response queue */
314         while ((ha->response_in =
315                 (uint16_t)le32_to_cpu(ha->shadow_regs->rsp_q_in)) !=
316                ha->response_out) {
317                 sts_entry = (struct status_entry *) ha->response_ptr;
318                 count++;
319
320                 /* Advance pointers for next entry */
321                 if (ha->response_out == (RESPONSE_QUEUE_DEPTH - 1)) {
322                         ha->response_out = 0;
323                         ha->response_ptr = ha->response_ring;
324                 } else {
325                         ha->response_out++;
326                         ha->response_ptr++;
327                 }
328
329                 /* process entry */
330                 switch (sts_entry->hdr.entryType) {
331                 case ET_STATUS:
332                         /*
333                          * Common status - Single completion posted in single
334                          * IOSB.
335                          */
336                         qla4xxx_status_entry(ha, sts_entry);
337                         break;
338
339                 case ET_PASSTHRU_STATUS:
340                         break;
341
342                 case ET_STATUS_CONTINUATION:
343                         /* Just throw away the status continuation entries */
344                         DEBUG2(printk("scsi%ld: %s: Status Continuation entry "
345                                       "- ignoring\n", ha->host_no, __func__));
346                         break;
347
348                 case ET_COMMAND:
349                         /* ISP device queue is full. Command not
350                          * accepted by ISP.  Queue command for
351                          * later */
352
353                         srb = qla4xxx_del_from_active_array(ha,
354                                                     le32_to_cpu(sts_entry->
355                                                                 handle));
356                         if (srb == NULL)
357                                 goto exit_prq_invalid_handle;
358
359                         DEBUG2(printk("scsi%ld: %s: FW device queue full, "
360                                       "srb %p\n", ha->host_no, __func__, srb));
361
362                         /* ETRY normally by sending it back with
363                          * DID_BUS_BUSY */
364                         srb->cmd->result = DID_BUS_BUSY << 16;
365                         qla4xxx_srb_compl(ha, srb);
366                         break;
367
368                 case ET_CONTINUE:
369                         /* Just throw away the continuation entries */
370                         DEBUG2(printk("scsi%ld: %s: Continuation entry - "
371                                       "ignoring\n", ha->host_no, __func__));
372                         break;
373
374                 default:
375                         /*
376                          * Invalid entry in response queue, reset RISC
377                          * firmware.
378                          */
379                         DEBUG2(printk("scsi%ld: %s: Invalid entry %x in "
380                                       "response queue \n", ha->host_no,
381                                       __func__,
382                                       sts_entry->hdr.entryType));
383                         goto exit_prq_error;
384                 }
385         }
386
387         /*
388          * Done with responses, update the ISP For QLA4010, this also clears
389          * the interrupt.
390          */
391         writel(ha->response_out, &ha->reg->rsp_q_out);
392         readl(&ha->reg->rsp_q_out);
393
394         return;
395
396 exit_prq_invalid_handle:
397         DEBUG2(printk("scsi%ld: %s: Invalid handle(srb)=%p type=%x IOCS=%x\n",
398                       ha->host_no, __func__, srb, sts_entry->hdr.entryType,
399                       sts_entry->completionStatus));
400
401 exit_prq_error:
402         writel(ha->response_out, &ha->reg->rsp_q_out);
403         readl(&ha->reg->rsp_q_out);
404
405         set_bit(DPC_RESET_HA, &ha->dpc_flags);
406 }
407
408 /**
409  * qla4xxx_isr_decode_mailbox - decodes mailbox status
410  * @ha: Pointer to host adapter structure.
411  * @mailbox_status: Mailbox status.
412  *
413  * This routine decodes the mailbox status during the ISR.
414  * Hardware_lock locked upon entry. runs in interrupt context.
415  **/
416 static void qla4xxx_isr_decode_mailbox(struct scsi_qla_host * ha,
417                                        uint32_t mbox_status)
418 {
419         int i;
420
421         if ((mbox_status == MBOX_STS_BUSY) ||
422             (mbox_status == MBOX_STS_INTERMEDIATE_COMPLETION) ||
423             (mbox_status >> 12 == MBOX_COMPLETION_STATUS)) {
424                 ha->mbox_status[0] = mbox_status;
425
426                 if (test_bit(AF_MBOX_COMMAND, &ha->flags)) {
427                         /*
428                          * Copy all mailbox registers to a temporary
429                          * location and set mailbox command done flag
430                          */
431                         for (i = 1; i < ha->mbox_status_count; i++)
432                                 ha->mbox_status[i] =
433                                         readl(&ha->reg->mailbox[i]);
434
435                         set_bit(AF_MBOX_COMMAND_DONE, &ha->flags);
436                         wake_up(&ha->mailbox_wait_queue);
437                 }
438         } else if (mbox_status >> 12 == MBOX_ASYNC_EVENT_STATUS) {
439                 /* Immediately process the AENs that don't require much work.
440                  * Only queue the database_changed AENs */
441                 switch (mbox_status) {
442                 case MBOX_ASTS_SYSTEM_ERROR:
443                         /* Log Mailbox registers */
444                         if (ql4xdontresethba) {
445                                 DEBUG2(printk("%s:Dont Reset HBA\n",
446                                               __func__));
447                         } else {
448                                 set_bit(AF_GET_CRASH_RECORD, &ha->flags);
449                                 set_bit(DPC_RESET_HA, &ha->dpc_flags);
450                         }
451                         break;
452
453                 case MBOX_ASTS_REQUEST_TRANSFER_ERROR:
454                 case MBOX_ASTS_RESPONSE_TRANSFER_ERROR:
455                 case MBOX_ASTS_NVRAM_INVALID:
456                 case MBOX_ASTS_IP_ADDRESS_CHANGED:
457                 case MBOX_ASTS_DHCP_LEASE_EXPIRED:
458                         DEBUG2(printk("scsi%ld: AEN %04x, ERROR Status, "
459                                       "Reset HA\n", ha->host_no, mbox_status));
460                         set_bit(DPC_RESET_HA, &ha->dpc_flags);
461                         break;
462
463                 case MBOX_ASTS_LINK_UP:
464                         DEBUG2(printk("scsi%ld: AEN %04x Adapter LINK UP\n",
465                                       ha->host_no, mbox_status));
466                         set_bit(AF_LINK_UP, &ha->flags);
467                         break;
468
469                 case MBOX_ASTS_LINK_DOWN:
470                         DEBUG2(printk("scsi%ld: AEN %04x Adapter LINK DOWN\n",
471                                       ha->host_no, mbox_status));
472                         clear_bit(AF_LINK_UP, &ha->flags);
473                         break;
474
475                 case MBOX_ASTS_HEARTBEAT:
476                         ha->seconds_since_last_heartbeat = 0;
477                         break;
478
479                 case MBOX_ASTS_DHCP_LEASE_ACQUIRED:
480                         DEBUG2(printk("scsi%ld: AEN %04x DHCP LEASE "
481                                       "ACQUIRED\n", ha->host_no, mbox_status));
482                         set_bit(DPC_GET_DHCP_IP_ADDR, &ha->dpc_flags);
483                         break;
484
485                 case MBOX_ASTS_PROTOCOL_STATISTIC_ALARM:
486                 case MBOX_ASTS_SCSI_COMMAND_PDU_REJECTED: /* Target
487                                                            * mode
488                                                            * only */
489                 case MBOX_ASTS_UNSOLICITED_PDU_RECEIVED:  /* Connection mode */
490                 case MBOX_ASTS_IPSEC_SYSTEM_FATAL_ERROR:
491                 case MBOX_ASTS_SUBNET_STATE_CHANGE:
492                         /* No action */
493                         DEBUG2(printk("scsi%ld: AEN %04x\n", ha->host_no,
494                                       mbox_status));
495                         break;
496
497                 case MBOX_ASTS_MAC_ADDRESS_CHANGED:
498                 case MBOX_ASTS_DNS:
499                         /* No action */
500                         DEBUG2(printk(KERN_INFO "scsi%ld: AEN %04x, "
501                                       "mbox_sts[1]=%04x, mbox_sts[2]=%04x\n",
502                                       ha->host_no, mbox_status,
503                                       readl(&ha->reg->mailbox[1]),
504                                       readl(&ha->reg->mailbox[2])));
505                         break;
506
507                 case MBOX_ASTS_SELF_TEST_FAILED:
508                 case MBOX_ASTS_LOGIN_FAILED:
509                         /* No action */
510                         DEBUG2(printk("scsi%ld: AEN %04x, mbox_sts[1]=%04x, "
511                                       "mbox_sts[2]=%04x, mbox_sts[3]=%04x\n",
512                                       ha->host_no, mbox_status,
513                                       readl(&ha->reg->mailbox[1]),
514                                       readl(&ha->reg->mailbox[2]),
515                                       readl(&ha->reg->mailbox[3])));
516                         break;
517
518                 case MBOX_ASTS_DATABASE_CHANGED:
519                         /* Queue AEN information and process it in the DPC
520                          * routine */
521                         if (ha->aen_q_count > 0) {
522                                 /* advance pointer */
523                                 if (ha->aen_in == (MAX_AEN_ENTRIES - 1))
524                                         ha->aen_in = 0;
525                                 else
526                                         ha->aen_in++;
527
528                                 /* decrement available counter */
529                                 ha->aen_q_count--;
530
531                                 for (i = 1; i < MBOX_AEN_REG_COUNT; i++)
532                                         ha->aen_q[ha->aen_in].mbox_sts[i] =
533                                                 readl(&ha->reg->mailbox[i]);
534
535                                 ha->aen_q[ha->aen_in].mbox_sts[0] = mbox_status;
536
537                                 /* print debug message */
538                                 DEBUG2(printk("scsi%ld: AEN[%d] %04x queued"
539                                               " mb1:0x%x mb2:0x%x mb3:0x%x mb4:0x%x\n",
540                                               ha->host_no, ha->aen_in,
541                                               mbox_status,
542                                               ha->aen_q[ha->aen_in].mbox_sts[1],
543                                               ha->aen_q[ha->aen_in].mbox_sts[2],
544                                               ha->aen_q[ha->aen_in].mbox_sts[3],
545                                               ha->aen_q[ha->aen_in].  mbox_sts[4]));
546
547                                 /* The DPC routine will process the aen */
548                                 set_bit(DPC_AEN, &ha->dpc_flags);
549                         } else {
550                                 DEBUG2(printk("scsi%ld: %s: aen %04x, queue "
551                                               "overflowed!  AEN LOST!!\n",
552                                               ha->host_no, __func__,
553                                               mbox_status));
554
555                                 DEBUG2(printk("scsi%ld: DUMP AEN QUEUE\n",
556                                               ha->host_no));
557
558                                 for (i = 0; i < MAX_AEN_ENTRIES; i++) {
559                                         DEBUG2(printk("AEN[%d] %04x %04x %04x "
560                                                       "%04x\n", i,
561                                                       ha->aen_q[i].mbox_sts[0],
562                                                       ha->aen_q[i].mbox_sts[1],
563                                                       ha->aen_q[i].mbox_sts[2],
564                                                       ha->aen_q[i].mbox_sts[3]));
565                                 }
566                         }
567                         break;
568
569                 default:
570                         DEBUG2(printk(KERN_WARNING
571                                       "scsi%ld: AEN %04x UNKNOWN\n",
572                                       ha->host_no, mbox_status));
573                         break;
574                 }
575         } else {
576                 DEBUG2(printk("scsi%ld: Unknown mailbox status %08X\n",
577                               ha->host_no, mbox_status));
578
579                 ha->mbox_status[0] = mbox_status;
580         }
581 }
582
583 /**
584  * qla4xxx_interrupt_service_routine - isr
585  * @ha: pointer to host adapter structure.
586  *
587  * This is the main interrupt service routine.
588  * hardware_lock locked upon entry. runs in interrupt context.
589  **/
590 void qla4xxx_interrupt_service_routine(struct scsi_qla_host * ha,
591                                        uint32_t intr_status)
592 {
593         /* Process response queue interrupt. */
594         if (intr_status & CSR_SCSI_COMPLETION_INTR)
595                 qla4xxx_process_response_queue(ha);
596
597         /* Process mailbox/asynch event  interrupt.*/
598         if (intr_status & CSR_SCSI_PROCESSOR_INTR) {
599                 qla4xxx_isr_decode_mailbox(ha,
600                                            readl(&ha->reg->mailbox[0]));
601
602                 /* Clear Mailbox Interrupt */
603                 writel(set_rmask(CSR_SCSI_PROCESSOR_INTR),
604                        &ha->reg->ctrl_status);
605                 readl(&ha->reg->ctrl_status);
606         }
607 }
608
609 /**
610  * qla4xxx_intr_handler - hardware interrupt handler.
611  * @irq: Unused
612  * @dev_id: Pointer to host adapter structure
613  * @regs: Unused
614  **/
615 irqreturn_t qla4xxx_intr_handler(int irq, void *dev_id, struct pt_regs *regs)
616 {
617         struct scsi_qla_host *ha;
618         uint32_t intr_status;
619         unsigned long flags = 0;
620         uint8_t reqs_count = 0;
621
622         ha = (struct scsi_qla_host *) dev_id;
623         if (!ha) {
624                 DEBUG2(printk(KERN_INFO
625                               "qla4xxx: Interrupt with NULL host ptr\n"));
626                 return IRQ_NONE;
627         }
628
629         spin_lock_irqsave(&ha->hardware_lock, flags);
630
631         /*
632          * Repeatedly service interrupts up to a maximum of
633          * MAX_REQS_SERVICED_PER_INTR
634          */
635         while (1) {
636                 /*
637                  * Read interrupt status
638                  */
639                 if (le32_to_cpu(ha->shadow_regs->rsp_q_in) !=
640                     ha->response_out)
641                         intr_status = CSR_SCSI_COMPLETION_INTR;
642                 else
643                         intr_status = readl(&ha->reg->ctrl_status);
644
645                 if ((intr_status &
646                      (CSR_SCSI_RESET_INTR|CSR_FATAL_ERROR|INTR_PENDING)) ==
647                     0) {
648                         if (reqs_count == 0)
649                                 ha->spurious_int_count++;
650                         break;
651                 }
652
653                 if (intr_status & CSR_FATAL_ERROR) {
654                         DEBUG2(printk(KERN_INFO "scsi%ld: Fatal Error, "
655                                       "Status 0x%04x\n", ha->host_no,
656                                       readl(isp_port_error_status (ha))));
657
658                         /* Issue Soft Reset to clear this error condition.
659                          * This will prevent the RISC from repeatedly
660                          * interrupting the driver; thus, allowing the DPC to
661                          * get scheduled to continue error recovery.
662                          * NOTE: Disabling RISC interrupts does not work in
663                          * this case, as CSR_FATAL_ERROR overrides
664                          * CSR_SCSI_INTR_ENABLE */
665                         if ((readl(&ha->reg->ctrl_status) &
666                              CSR_SCSI_RESET_INTR) == 0) {
667                                 writel(set_rmask(CSR_SOFT_RESET),
668                                        &ha->reg->ctrl_status);
669                                 readl(&ha->reg->ctrl_status);
670                         }
671
672                         writel(set_rmask(CSR_FATAL_ERROR),
673                                &ha->reg->ctrl_status);
674                         readl(&ha->reg->ctrl_status);
675
676                         __qla4xxx_disable_intrs(ha);
677
678                         set_bit(DPC_RESET_HA, &ha->dpc_flags);
679
680                         break;
681                 } else if (intr_status & CSR_SCSI_RESET_INTR) {
682                         clear_bit(AF_ONLINE, &ha->flags);
683                         __qla4xxx_disable_intrs(ha);
684
685                         writel(set_rmask(CSR_SCSI_RESET_INTR),
686                                &ha->reg->ctrl_status);
687                         readl(&ha->reg->ctrl_status);
688
689                         set_bit(DPC_RESET_HA_INTR, &ha->dpc_flags);
690
691                         break;
692                 } else if (intr_status & INTR_PENDING) {
693                         qla4xxx_interrupt_service_routine(ha, intr_status);
694                         ha->total_io_count++;
695                         if (++reqs_count == MAX_REQS_SERVICED_PER_INTR)
696                                 break;
697
698                         intr_status = 0;
699                 }
700         }
701
702         spin_unlock_irqrestore(&ha->hardware_lock, flags);
703
704         return IRQ_HANDLED;
705 }
706
707 /**
708  * qla4xxx_process_aen - processes AENs generated by firmware
709  * @ha: pointer to host adapter structure.
710  * @process_aen: type of AENs to process
711  *
712  * Processes specific types of Asynchronous Events generated by firmware.
713  * The type of AENs to process is specified by process_aen and can be
714  *      PROCESS_ALL_AENS         0
715  *      FLUSH_DDB_CHANGED_AENS   1
716  *      RELOGIN_DDB_CHANGED_AENS 2
717  **/
718 void qla4xxx_process_aen(struct scsi_qla_host * ha, uint8_t process_aen)
719 {
720         uint32_t mbox_sts[MBOX_AEN_REG_COUNT];
721         struct aen *aen;
722         int i;
723         unsigned long flags;
724
725         spin_lock_irqsave(&ha->hardware_lock, flags);
726         while (ha->aen_out != ha->aen_in) {
727                 /* Advance pointers for next entry */
728                 if (ha->aen_out == (MAX_AEN_ENTRIES - 1))
729                         ha->aen_out = 0;
730                 else
731                         ha->aen_out++;
732
733                 ha->aen_q_count++;
734                 aen = &ha->aen_q[ha->aen_out];
735
736                 /* copy aen information to local structure */
737                 for (i = 0; i < MBOX_AEN_REG_COUNT; i++)
738                         mbox_sts[i] = aen->mbox_sts[i];
739
740                 spin_unlock_irqrestore(&ha->hardware_lock, flags);
741
742                 DEBUG(printk("scsi%ld: AEN[%d] %04x, index [%d] state=%04x "
743                              "mod=%x conerr=%08x \n", ha->host_no, ha->aen_out,
744                              mbox_sts[0], mbox_sts[2], mbox_sts[3],
745                              mbox_sts[1], mbox_sts[4]));
746
747                 switch (mbox_sts[0]) {
748                 case MBOX_ASTS_DATABASE_CHANGED:
749                         if (process_aen == FLUSH_DDB_CHANGED_AENS) {
750                                 DEBUG2(printk("scsi%ld: AEN[%d] %04x, index "
751                                               "[%d] state=%04x FLUSHED!\n",
752                                               ha->host_no, ha->aen_out,
753                                               mbox_sts[0], mbox_sts[2],
754                                               mbox_sts[3]));
755                                 break;
756                         } else if (process_aen == RELOGIN_DDB_CHANGED_AENS) {
757                                 /* for use during init time, we only want to
758                                  * relogin non-active ddbs */
759                                 struct ddb_entry *ddb_entry;
760
761                                 ddb_entry =
762                                         /* FIXME: name length? */
763                                         qla4xxx_lookup_ddb_by_fw_index(ha,
764                                                                        mbox_sts[2]);
765                                 if (!ddb_entry)
766                                         break;
767
768                                 ddb_entry->dev_scan_wait_to_complete_relogin =
769                                         0;
770                                 ddb_entry->dev_scan_wait_to_start_relogin =
771                                         jiffies +
772                                         ((ddb_entry->default_time2wait +
773                                           4) * HZ);
774
775                                 DEBUG2(printk("scsi%ld: ddb index [%d] initate"
776                                               " RELOGIN after %d seconds\n",
777                                               ha->host_no,
778                                               ddb_entry->fw_ddb_index,
779                                               ddb_entry->default_time2wait +
780                                               4));
781                                 break;
782                         }
783
784                         if (mbox_sts[1] == 0) { /* Global DB change. */
785                                 qla4xxx_reinitialize_ddb_list(ha);
786                         } else if (mbox_sts[1] == 1) {  /* Specific device. */
787                                 qla4xxx_process_ddb_changed(ha, mbox_sts[2],
788                                                             mbox_sts[3]);
789                         }
790                         break;
791                 }
792                 spin_lock_irqsave(&ha->hardware_lock, flags);
793         }
794         spin_unlock_irqrestore(&ha->hardware_lock, flags);
795
796 }
797