Merge branch 'linus' into x86/cpu
[linux-2.6] / 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 #include "ql4_glbl.h"
10 #include "ql4_dbg.h"
11 #include "ql4_inline.h"
12
13 /**
14  * qla4xxx_status_entry - processes status IOCBs
15  * @ha: Pointer to host adapter structure.
16  * @sts_entry: Pointer to status entry structure.
17  **/
18 static void qla4xxx_status_entry(struct scsi_qla_host *ha,
19                                  struct status_entry *sts_entry)
20 {
21         uint8_t scsi_status;
22         struct scsi_cmnd *cmd;
23         struct srb *srb;
24         struct ddb_entry *ddb_entry;
25         uint32_t residual;
26         uint16_t sensebytecnt;
27
28         srb = qla4xxx_del_from_active_array(ha, le32_to_cpu(sts_entry->handle));
29         if (!srb) {
30                 /* FIXMEdg: Don't we need to reset ISP in this case??? */
31                 DEBUG2(printk(KERN_WARNING "scsi%ld: %s: Status Entry invalid "
32                               "handle 0x%x, sp=%p. This cmd may have already "
33                               "been completed.\n", ha->host_no, __func__,
34                               le32_to_cpu(sts_entry->handle), srb));
35                 dev_warn(&ha->pdev->dev, "%s invalid status entry:"
36                         " handle=0x%0x\n", __func__, sts_entry->handle);
37                 set_bit(DPC_RESET_HA, &ha->dpc_flags);
38                 return;
39         }
40
41         cmd = srb->cmd;
42         if (cmd == NULL) {
43                 DEBUG2(printk("scsi%ld: %s: Command already returned back to "
44                               "OS pkt->handle=%d srb=%p srb->state:%d\n",
45                               ha->host_no, __func__, sts_entry->handle,
46                               srb, srb->state));
47                 dev_warn(&ha->pdev->dev, "Command is NULL:"
48                         " already returned to OS (srb=%p)\n", srb);
49                 return;
50         }
51
52         ddb_entry = srb->ddb;
53         if (ddb_entry == NULL) {
54                 cmd->result = DID_NO_CONNECT << 16;
55                 goto status_entry_exit;
56         }
57
58         residual = le32_to_cpu(sts_entry->residualByteCnt);
59
60         /* Translate ISP error to a Linux SCSI error. */
61         scsi_status = sts_entry->scsiStatus;
62         switch (sts_entry->completionStatus) {
63         case SCS_COMPLETE:
64
65                 if (sts_entry->iscsiFlags & ISCSI_FLAG_RESIDUAL_OVER) {
66                         cmd->result = DID_ERROR << 16;
67                         break;
68                 }
69
70                 if (sts_entry->iscsiFlags &ISCSI_FLAG_RESIDUAL_UNDER) {
71                         scsi_set_resid(cmd, residual);
72                         if (!scsi_status && ((scsi_bufflen(cmd) - residual) <
73                                 cmd->underflow)) {
74
75                                 cmd->result = DID_ERROR << 16;
76
77                                 DEBUG2(printk("scsi%ld:%d:%d:%d: %s: "
78                                         "Mid-layer Data underrun0, "
79                                         "xferlen = 0x%x, "
80                                         "residual = 0x%x\n", ha->host_no,
81                                         cmd->device->channel,
82                                         cmd->device->id,
83                                         cmd->device->lun, __func__,
84                                         scsi_bufflen(cmd), residual));
85                                 break;
86                         }
87                 }
88
89                 cmd->result = DID_OK << 16 | scsi_status;
90
91                 if (scsi_status != SCSI_CHECK_CONDITION)
92                         break;
93
94                 /* Copy Sense Data into sense buffer. */
95                 memset(cmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
96
97                 sensebytecnt = le16_to_cpu(sts_entry->senseDataByteCnt);
98                 if (sensebytecnt == 0)
99                         break;
100
101                 memcpy(cmd->sense_buffer, sts_entry->senseData,
102                        min_t(uint16_t, sensebytecnt, SCSI_SENSE_BUFFERSIZE));
103
104                 DEBUG2(printk("scsi%ld:%d:%d:%d: %s: sense key = %x, "
105                               "ASC/ASCQ = %02x/%02x\n", ha->host_no,
106                               cmd->device->channel, cmd->device->id,
107                               cmd->device->lun, __func__,
108                               sts_entry->senseData[2] & 0x0f,
109                               sts_entry->senseData[12],
110                               sts_entry->senseData[13]));
111
112                 srb->flags |= SRB_GOT_SENSE;
113                 break;
114
115         case SCS_INCOMPLETE:
116                 /* Always set the status to DID_ERROR, since
117                  * all conditions result in that status anyway */
118                 cmd->result = DID_ERROR << 16;
119                 break;
120
121         case SCS_RESET_OCCURRED:
122                 DEBUG2(printk("scsi%ld:%d:%d:%d: %s: Device RESET occurred\n",
123                               ha->host_no, cmd->device->channel,
124                               cmd->device->id, cmd->device->lun, __func__));
125
126                 cmd->result = DID_RESET << 16;
127                 break;
128
129         case SCS_ABORTED:
130                 DEBUG2(printk("scsi%ld:%d:%d:%d: %s: Abort occurred\n",
131                               ha->host_no, cmd->device->channel,
132                               cmd->device->id, cmd->device->lun, __func__));
133
134                 cmd->result = DID_RESET << 16;
135                 break;
136
137         case SCS_TIMEOUT:
138                 DEBUG2(printk(KERN_INFO "scsi%ld:%d:%d:%d: Timeout\n",
139                               ha->host_no, cmd->device->channel,
140                               cmd->device->id, cmd->device->lun));
141
142                 cmd->result = DID_BUS_BUSY << 16;
143
144                 /*
145                  * Mark device missing so that we won't continue to send
146                  * I/O to this device.  We should get a ddb state change
147                  * AEN soon.
148                  */
149                 if (atomic_read(&ddb_entry->state) == DDB_STATE_ONLINE)
150                         qla4xxx_mark_device_missing(ha, ddb_entry);
151                 break;
152
153         case SCS_DATA_UNDERRUN:
154         case SCS_DATA_OVERRUN:
155                 if ((sts_entry->iscsiFlags & ISCSI_FLAG_RESIDUAL_OVER) ||
156                         (sts_entry->completionStatus == SCS_DATA_OVERRUN)) {
157                         DEBUG2(printk("scsi%ld:%d:%d:%d: %s: " "Data overrun, "
158                                       "residual = 0x%x\n", ha->host_no,
159                                       cmd->device->channel, cmd->device->id,
160                                       cmd->device->lun, __func__, residual));
161
162                         cmd->result = DID_ERROR << 16;
163                         break;
164                 }
165
166                 scsi_set_resid(cmd, residual);
167
168                 /*
169                  * If there is scsi_status, it takes precedense over
170                  * underflow condition.
171                  */
172                 if (scsi_status != 0) {
173                         cmd->result = DID_OK << 16 | scsi_status;
174
175                         if (scsi_status != SCSI_CHECK_CONDITION)
176                                 break;
177
178                         /* Copy Sense Data into sense buffer. */
179                         memset(cmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
180
181                         sensebytecnt =
182                                 le16_to_cpu(sts_entry->senseDataByteCnt);
183                         if (sensebytecnt == 0)
184                                 break;
185
186                         memcpy(cmd->sense_buffer, sts_entry->senseData,
187                                min_t(uint16_t, sensebytecnt, SCSI_SENSE_BUFFERSIZE));
188
189                         DEBUG2(printk("scsi%ld:%d:%d:%d: %s: sense key = %x, "
190                                       "ASC/ASCQ = %02x/%02x\n", ha->host_no,
191                                       cmd->device->channel, cmd->device->id,
192                                       cmd->device->lun, __func__,
193                                       sts_entry->senseData[2] & 0x0f,
194                                       sts_entry->senseData[12],
195                                       sts_entry->senseData[13]));
196                 } else {
197                         /*
198                          * If RISC reports underrun and target does not
199                          * report it then we must have a lost frame, so
200                          * tell upper layer to retry it by reporting a
201                          * bus busy.
202                          */
203                         if ((sts_entry->iscsiFlags &
204                              ISCSI_FLAG_RESIDUAL_UNDER) == 0) {
205                                 cmd->result = DID_BUS_BUSY << 16;
206                         } else if ((scsi_bufflen(cmd) - residual) <
207                                    cmd->underflow) {
208                                 /*
209                                  * Handle mid-layer underflow???
210                                  *
211                                  * For kernels less than 2.4, the driver must
212                                  * return an error if an underflow is detected.
213                                  * For kernels equal-to and above 2.4, the
214                                  * mid-layer will appearantly handle the
215                                  * underflow by detecting the residual count --
216                                  * unfortunately, we do not see where this is
217                                  * actually being done.  In the interim, we
218                                  * will return DID_ERROR.
219                                  */
220                                 DEBUG2(printk("scsi%ld:%d:%d:%d: %s: "
221                                         "Mid-layer Data underrun1, "
222                                         "xferlen = 0x%x, "
223                                         "residual = 0x%x\n", ha->host_no,
224                                         cmd->device->channel,
225                                         cmd->device->id,
226                                         cmd->device->lun, __func__,
227                                         scsi_bufflen(cmd), residual));
228
229                                 cmd->result = DID_ERROR << 16;
230                         } else {
231                                 cmd->result = DID_OK << 16;
232                         }
233                 }
234                 break;
235
236         case SCS_DEVICE_LOGGED_OUT:
237         case SCS_DEVICE_UNAVAILABLE:
238                 /*
239                  * Mark device missing so that we won't continue to
240                  * send I/O to this device.  We should get a ddb
241                  * state change AEN soon.
242                  */
243                 if (atomic_read(&ddb_entry->state) == DDB_STATE_ONLINE)
244                         qla4xxx_mark_device_missing(ha, ddb_entry);
245
246                 cmd->result = DID_BUS_BUSY << 16;
247                 break;
248
249         case SCS_QUEUE_FULL:
250                 /*
251                  * SCSI Mid-Layer handles device queue full
252                  */
253                 cmd->result = DID_OK << 16 | sts_entry->scsiStatus;
254                 DEBUG2(printk("scsi%ld:%d:%d: %s: QUEUE FULL detected "
255                               "compl=%02x, scsi=%02x, state=%02x, iFlags=%02x,"
256                               " iResp=%02x\n", ha->host_no, cmd->device->id,
257                               cmd->device->lun, __func__,
258                               sts_entry->completionStatus,
259                               sts_entry->scsiStatus, sts_entry->state_flags,
260                               sts_entry->iscsiFlags,
261                               sts_entry->iscsiResponse));
262                 break;
263
264         default:
265                 cmd->result = DID_ERROR << 16;
266                 break;
267         }
268
269 status_entry_exit:
270
271         /* complete the request */
272         srb->cc_stat = sts_entry->completionStatus;
273         qla4xxx_srb_compl(ha, srb);
274 }
275
276 /**
277  * qla4xxx_process_response_queue - process response queue completions
278  * @ha: Pointer to host adapter structure.
279  *
280  * This routine process response queue completions in interrupt context.
281  * Hardware_lock locked upon entry
282  **/
283 static void qla4xxx_process_response_queue(struct scsi_qla_host * ha)
284 {
285         uint32_t count = 0;
286         struct srb *srb = NULL;
287         struct status_entry *sts_entry;
288
289         /* Process all responses from response queue */
290         while ((ha->response_in =
291                 (uint16_t)le32_to_cpu(ha->shadow_regs->rsp_q_in)) !=
292                ha->response_out) {
293                 sts_entry = (struct status_entry *) ha->response_ptr;
294                 count++;
295
296                 /* Advance pointers for next entry */
297                 if (ha->response_out == (RESPONSE_QUEUE_DEPTH - 1)) {
298                         ha->response_out = 0;
299                         ha->response_ptr = ha->response_ring;
300                 } else {
301                         ha->response_out++;
302                         ha->response_ptr++;
303                 }
304
305                 /* process entry */
306                 switch (sts_entry->hdr.entryType) {
307                 case ET_STATUS:
308                         /*
309                          * Common status - Single completion posted in single
310                          * IOSB.
311                          */
312                         qla4xxx_status_entry(ha, sts_entry);
313                         break;
314
315                 case ET_PASSTHRU_STATUS:
316                         break;
317
318                 case ET_STATUS_CONTINUATION:
319                         /* Just throw away the status continuation entries */
320                         DEBUG2(printk("scsi%ld: %s: Status Continuation entry "
321                                       "- ignoring\n", ha->host_no, __func__));
322                         break;
323
324                 case ET_COMMAND:
325                         /* ISP device queue is full. Command not
326                          * accepted by ISP.  Queue command for
327                          * later */
328
329                         srb = qla4xxx_del_from_active_array(ha,
330                                                     le32_to_cpu(sts_entry->
331                                                                 handle));
332                         if (srb == NULL)
333                                 goto exit_prq_invalid_handle;
334
335                         DEBUG2(printk("scsi%ld: %s: FW device queue full, "
336                                       "srb %p\n", ha->host_no, __func__, srb));
337
338                         /* ETRY normally by sending it back with
339                          * DID_BUS_BUSY */
340                         srb->cmd->result = DID_BUS_BUSY << 16;
341                         qla4xxx_srb_compl(ha, srb);
342                         break;
343
344                 case ET_CONTINUE:
345                         /* Just throw away the continuation entries */
346                         DEBUG2(printk("scsi%ld: %s: Continuation entry - "
347                                       "ignoring\n", ha->host_no, __func__));
348                         break;
349
350                 default:
351                         /*
352                          * Invalid entry in response queue, reset RISC
353                          * firmware.
354                          */
355                         DEBUG2(printk("scsi%ld: %s: Invalid entry %x in "
356                                       "response queue \n", ha->host_no,
357                                       __func__,
358                                       sts_entry->hdr.entryType));
359                         goto exit_prq_error;
360                 }
361         }
362
363         /*
364          * Done with responses, update the ISP For QLA4010, this also clears
365          * the interrupt.
366          */
367         writel(ha->response_out, &ha->reg->rsp_q_out);
368         readl(&ha->reg->rsp_q_out);
369
370         return;
371
372 exit_prq_invalid_handle:
373         DEBUG2(printk("scsi%ld: %s: Invalid handle(srb)=%p type=%x IOCS=%x\n",
374                       ha->host_no, __func__, srb, sts_entry->hdr.entryType,
375                       sts_entry->completionStatus));
376
377 exit_prq_error:
378         writel(ha->response_out, &ha->reg->rsp_q_out);
379         readl(&ha->reg->rsp_q_out);
380
381         set_bit(DPC_RESET_HA, &ha->dpc_flags);
382 }
383
384 /**
385  * qla4xxx_isr_decode_mailbox - decodes mailbox status
386  * @ha: Pointer to host adapter structure.
387  * @mailbox_status: Mailbox status.
388  *
389  * This routine decodes the mailbox status during the ISR.
390  * Hardware_lock locked upon entry. runs in interrupt context.
391  **/
392 static void qla4xxx_isr_decode_mailbox(struct scsi_qla_host * ha,
393                                        uint32_t mbox_status)
394 {
395         int i;
396         uint32_t mbox_stat2, mbox_stat3;
397
398         if ((mbox_status == MBOX_STS_BUSY) ||
399             (mbox_status == MBOX_STS_INTERMEDIATE_COMPLETION) ||
400             (mbox_status >> 12 == MBOX_COMPLETION_STATUS)) {
401                 ha->mbox_status[0] = mbox_status;
402
403                 if (test_bit(AF_MBOX_COMMAND, &ha->flags)) {
404                         /*
405                          * Copy all mailbox registers to a temporary
406                          * location and set mailbox command done flag
407                          */
408                         for (i = 1; i < ha->mbox_status_count; i++)
409                                 ha->mbox_status[i] =
410                                         readl(&ha->reg->mailbox[i]);
411
412                         set_bit(AF_MBOX_COMMAND_DONE, &ha->flags);
413                 }
414         } else if (mbox_status >> 12 == MBOX_ASYNC_EVENT_STATUS) {
415                 /* Immediately process the AENs that don't require much work.
416                  * Only queue the database_changed AENs */
417                 if (ha->aen_log.count < MAX_AEN_ENTRIES) {
418                         for (i = 0; i < MBOX_AEN_REG_COUNT; i++)
419                                 ha->aen_log.entry[ha->aen_log.count].mbox_sts[i] =
420                                         readl(&ha->reg->mailbox[i]);
421                         ha->aen_log.count++;
422                 }
423                 switch (mbox_status) {
424                 case MBOX_ASTS_SYSTEM_ERROR:
425                         /* Log Mailbox registers */
426                         if (ql4xdontresethba) {
427                                 DEBUG2(printk("%s:Dont Reset HBA\n",
428                                               __func__));
429                         } else {
430                                 set_bit(AF_GET_CRASH_RECORD, &ha->flags);
431                                 set_bit(DPC_RESET_HA, &ha->dpc_flags);
432                         }
433                         break;
434
435                 case MBOX_ASTS_REQUEST_TRANSFER_ERROR:
436                 case MBOX_ASTS_RESPONSE_TRANSFER_ERROR:
437                 case MBOX_ASTS_NVRAM_INVALID:
438                 case MBOX_ASTS_IP_ADDRESS_CHANGED:
439                 case MBOX_ASTS_DHCP_LEASE_EXPIRED:
440                         DEBUG2(printk("scsi%ld: AEN %04x, ERROR Status, "
441                                       "Reset HA\n", ha->host_no, mbox_status));
442                         set_bit(DPC_RESET_HA, &ha->dpc_flags);
443                         break;
444
445                 case MBOX_ASTS_LINK_UP:
446                         DEBUG2(printk("scsi%ld: AEN %04x Adapter LINK UP\n",
447                                       ha->host_no, mbox_status));
448                         set_bit(AF_LINK_UP, &ha->flags);
449                         break;
450
451                 case MBOX_ASTS_LINK_DOWN:
452                         DEBUG2(printk("scsi%ld: AEN %04x Adapter LINK DOWN\n",
453                                       ha->host_no, mbox_status));
454                         clear_bit(AF_LINK_UP, &ha->flags);
455                         break;
456
457                 case MBOX_ASTS_HEARTBEAT:
458                         ha->seconds_since_last_heartbeat = 0;
459                         break;
460
461                 case MBOX_ASTS_DHCP_LEASE_ACQUIRED:
462                         DEBUG2(printk("scsi%ld: AEN %04x DHCP LEASE "
463                                       "ACQUIRED\n", ha->host_no, mbox_status));
464                         set_bit(DPC_GET_DHCP_IP_ADDR, &ha->dpc_flags);
465                         break;
466
467                 case MBOX_ASTS_PROTOCOL_STATISTIC_ALARM:
468                 case MBOX_ASTS_SCSI_COMMAND_PDU_REJECTED: /* Target
469                                                            * mode
470                                                            * only */
471                 case MBOX_ASTS_UNSOLICITED_PDU_RECEIVED:  /* Connection mode */
472                 case MBOX_ASTS_IPSEC_SYSTEM_FATAL_ERROR:
473                 case MBOX_ASTS_SUBNET_STATE_CHANGE:
474                         /* No action */
475                         DEBUG2(printk("scsi%ld: AEN %04x\n", ha->host_no,
476                                       mbox_status));
477                         break;
478
479                 case MBOX_ASTS_IP_ADDR_STATE_CHANGED:
480                         mbox_stat2 = readl(&ha->reg->mailbox[2]);
481                         mbox_stat3 = readl(&ha->reg->mailbox[3]);
482
483                         if ((mbox_stat3 == 5) && (mbox_stat2 == 3))
484                                 set_bit(DPC_GET_DHCP_IP_ADDR, &ha->dpc_flags);
485                         else if ((mbox_stat3 == 2) && (mbox_stat2 == 5))
486                                 set_bit(DPC_RESET_HA, &ha->dpc_flags);
487                         break;
488
489                 case MBOX_ASTS_MAC_ADDRESS_CHANGED:
490                 case MBOX_ASTS_DNS:
491                         /* No action */
492                         DEBUG2(printk(KERN_INFO "scsi%ld: AEN %04x, "
493                                       "mbox_sts[1]=%04x, mbox_sts[2]=%04x\n",
494                                       ha->host_no, mbox_status,
495                                       readl(&ha->reg->mailbox[1]),
496                                       readl(&ha->reg->mailbox[2])));
497                         break;
498
499                 case MBOX_ASTS_SELF_TEST_FAILED:
500                 case MBOX_ASTS_LOGIN_FAILED:
501                         /* No action */
502                         DEBUG2(printk("scsi%ld: AEN %04x, mbox_sts[1]=%04x, "
503                                       "mbox_sts[2]=%04x, mbox_sts[3]=%04x\n",
504                                       ha->host_no, mbox_status,
505                                       readl(&ha->reg->mailbox[1]),
506                                       readl(&ha->reg->mailbox[2]),
507                                       readl(&ha->reg->mailbox[3])));
508                         break;
509
510                 case MBOX_ASTS_DATABASE_CHANGED:
511                         /* Queue AEN information and process it in the DPC
512                          * routine */
513                         if (ha->aen_q_count > 0) {
514
515                                 /* decrement available counter */
516                                 ha->aen_q_count--;
517
518                                 for (i = 1; i < MBOX_AEN_REG_COUNT; i++)
519                                         ha->aen_q[ha->aen_in].mbox_sts[i] =
520                                                 readl(&ha->reg->mailbox[i]);
521
522                                 ha->aen_q[ha->aen_in].mbox_sts[0] = mbox_status;
523
524                                 /* print debug message */
525                                 DEBUG2(printk("scsi%ld: AEN[%d] %04x queued"
526                                               " mb1:0x%x mb2:0x%x mb3:0x%x mb4:0x%x\n",
527                                               ha->host_no, ha->aen_in,
528                                               mbox_status,
529                                               ha->aen_q[ha->aen_in].mbox_sts[1],
530                                               ha->aen_q[ha->aen_in].mbox_sts[2],
531                                               ha->aen_q[ha->aen_in].mbox_sts[3],
532                                               ha->aen_q[ha->aen_in].  mbox_sts[4]));
533                                 /* advance pointer */
534                                 ha->aen_in++;
535                                 if (ha->aen_in == MAX_AEN_ENTRIES)
536                                         ha->aen_in = 0;
537
538                                 /* The DPC routine will process the aen */
539                                 set_bit(DPC_AEN, &ha->dpc_flags);
540                         } else {
541                                 DEBUG2(printk("scsi%ld: %s: aen %04x, queue "
542                                               "overflowed!  AEN LOST!!\n",
543                                               ha->host_no, __func__,
544                                               mbox_status));
545
546                                 DEBUG2(printk("scsi%ld: DUMP AEN QUEUE\n",
547                                               ha->host_no));
548
549                                 for (i = 0; i < MAX_AEN_ENTRIES; i++) {
550                                         DEBUG2(printk("AEN[%d] %04x %04x %04x "
551                                                       "%04x\n", i,
552                                                       ha->aen_q[i].mbox_sts[0],
553                                                       ha->aen_q[i].mbox_sts[1],
554                                                       ha->aen_q[i].mbox_sts[2],
555                                                       ha->aen_q[i].mbox_sts[3]));
556                                 }
557                         }
558                         break;
559
560                 default:
561                         DEBUG2(printk(KERN_WARNING
562                                       "scsi%ld: AEN %04x UNKNOWN\n",
563                                       ha->host_no, mbox_status));
564                         break;
565                 }
566         } else {
567                 DEBUG2(printk("scsi%ld: Unknown mailbox status %08X\n",
568                               ha->host_no, mbox_status));
569
570                 ha->mbox_status[0] = mbox_status;
571         }
572 }
573
574 /**
575  * qla4xxx_interrupt_service_routine - isr
576  * @ha: pointer to host adapter structure.
577  *
578  * This is the main interrupt service routine.
579  * hardware_lock locked upon entry. runs in interrupt context.
580  **/
581 void qla4xxx_interrupt_service_routine(struct scsi_qla_host * ha,
582                                        uint32_t intr_status)
583 {
584         /* Process response queue interrupt. */
585         if (intr_status & CSR_SCSI_COMPLETION_INTR)
586                 qla4xxx_process_response_queue(ha);
587
588         /* Process mailbox/asynch event  interrupt.*/
589         if (intr_status & CSR_SCSI_PROCESSOR_INTR) {
590                 qla4xxx_isr_decode_mailbox(ha,
591                                            readl(&ha->reg->mailbox[0]));
592
593                 /* Clear Mailbox Interrupt */
594                 writel(set_rmask(CSR_SCSI_PROCESSOR_INTR),
595                        &ha->reg->ctrl_status);
596                 readl(&ha->reg->ctrl_status);
597         }
598 }
599
600 /**
601  * qla4xxx_intr_handler - hardware interrupt handler.
602  * @irq: Unused
603  * @dev_id: Pointer to host adapter structure
604  **/
605 irqreturn_t qla4xxx_intr_handler(int irq, void *dev_id)
606 {
607         struct scsi_qla_host *ha;
608         uint32_t intr_status;
609         unsigned long flags = 0;
610         uint8_t reqs_count = 0;
611
612         ha = (struct scsi_qla_host *) dev_id;
613         if (!ha) {
614                 DEBUG2(printk(KERN_INFO
615                               "qla4xxx: Interrupt with NULL host ptr\n"));
616                 return IRQ_NONE;
617         }
618
619         spin_lock_irqsave(&ha->hardware_lock, flags);
620
621         ha->isr_count++;
622         /*
623          * Repeatedly service interrupts up to a maximum of
624          * MAX_REQS_SERVICED_PER_INTR
625          */
626         while (1) {
627                 /*
628                  * Read interrupt status
629                  */
630                 if (le32_to_cpu(ha->shadow_regs->rsp_q_in) !=
631                     ha->response_out)
632                         intr_status = CSR_SCSI_COMPLETION_INTR;
633                 else
634                         intr_status = readl(&ha->reg->ctrl_status);
635
636                 if ((intr_status &
637                      (CSR_SCSI_RESET_INTR|CSR_FATAL_ERROR|INTR_PENDING)) ==
638                     0) {
639                         if (reqs_count == 0)
640                                 ha->spurious_int_count++;
641                         break;
642                 }
643
644                 if (intr_status & CSR_FATAL_ERROR) {
645                         DEBUG2(printk(KERN_INFO "scsi%ld: Fatal Error, "
646                                       "Status 0x%04x\n", ha->host_no,
647                                       readl(isp_port_error_status (ha))));
648
649                         /* Issue Soft Reset to clear this error condition.
650                          * This will prevent the RISC from repeatedly
651                          * interrupting the driver; thus, allowing the DPC to
652                          * get scheduled to continue error recovery.
653                          * NOTE: Disabling RISC interrupts does not work in
654                          * this case, as CSR_FATAL_ERROR overrides
655                          * CSR_SCSI_INTR_ENABLE */
656                         if ((readl(&ha->reg->ctrl_status) &
657                              CSR_SCSI_RESET_INTR) == 0) {
658                                 writel(set_rmask(CSR_SOFT_RESET),
659                                        &ha->reg->ctrl_status);
660                                 readl(&ha->reg->ctrl_status);
661                         }
662
663                         writel(set_rmask(CSR_FATAL_ERROR),
664                                &ha->reg->ctrl_status);
665                         readl(&ha->reg->ctrl_status);
666
667                         __qla4xxx_disable_intrs(ha);
668
669                         set_bit(DPC_RESET_HA, &ha->dpc_flags);
670
671                         break;
672                 } else if (intr_status & CSR_SCSI_RESET_INTR) {
673                         clear_bit(AF_ONLINE, &ha->flags);
674                         __qla4xxx_disable_intrs(ha);
675
676                         writel(set_rmask(CSR_SCSI_RESET_INTR),
677                                &ha->reg->ctrl_status);
678                         readl(&ha->reg->ctrl_status);
679
680                         if (!ql4_mod_unload)
681                                 set_bit(DPC_RESET_HA_INTR, &ha->dpc_flags);
682
683                         break;
684                 } else if (intr_status & INTR_PENDING) {
685                         qla4xxx_interrupt_service_routine(ha, intr_status);
686                         ha->total_io_count++;
687                         if (++reqs_count == MAX_REQS_SERVICED_PER_INTR)
688                                 break;
689
690                         intr_status = 0;
691                 }
692         }
693
694         spin_unlock_irqrestore(&ha->hardware_lock, flags);
695
696         return IRQ_HANDLED;
697 }
698
699 /**
700  * qla4xxx_process_aen - processes AENs generated by firmware
701  * @ha: pointer to host adapter structure.
702  * @process_aen: type of AENs to process
703  *
704  * Processes specific types of Asynchronous Events generated by firmware.
705  * The type of AENs to process is specified by process_aen and can be
706  *      PROCESS_ALL_AENS         0
707  *      FLUSH_DDB_CHANGED_AENS   1
708  *      RELOGIN_DDB_CHANGED_AENS 2
709  **/
710 void qla4xxx_process_aen(struct scsi_qla_host * ha, uint8_t process_aen)
711 {
712         uint32_t mbox_sts[MBOX_AEN_REG_COUNT];
713         struct aen *aen;
714         int i;
715         unsigned long flags;
716
717         spin_lock_irqsave(&ha->hardware_lock, flags);
718         while (ha->aen_out != ha->aen_in) {
719                 aen = &ha->aen_q[ha->aen_out];
720                 /* copy aen information to local structure */
721                 for (i = 0; i < MBOX_AEN_REG_COUNT; i++)
722                         mbox_sts[i] = aen->mbox_sts[i];
723
724                 ha->aen_q_count++;
725                 ha->aen_out++;
726
727                 if (ha->aen_out == MAX_AEN_ENTRIES)
728                         ha->aen_out = 0;
729
730                 spin_unlock_irqrestore(&ha->hardware_lock, flags);
731
732                 DEBUG2(printk("qla4xxx(%ld): AEN[%d]=0x%08x, mbx1=0x%08x mbx2=0x%08x"
733                         " mbx3=0x%08x mbx4=0x%08x\n", ha->host_no,
734                         (ha->aen_out ? (ha->aen_out-1): (MAX_AEN_ENTRIES-1)),
735                         mbox_sts[0], mbox_sts[1], mbox_sts[2],
736                         mbox_sts[3], mbox_sts[4]));
737
738                 switch (mbox_sts[0]) {
739                 case MBOX_ASTS_DATABASE_CHANGED:
740                         if (process_aen == FLUSH_DDB_CHANGED_AENS) {
741                                 DEBUG2(printk("scsi%ld: AEN[%d] %04x, index "
742                                               "[%d] state=%04x FLUSHED!\n",
743                                               ha->host_no, ha->aen_out,
744                                               mbox_sts[0], mbox_sts[2],
745                                               mbox_sts[3]));
746                                 break;
747                         } else if (process_aen == RELOGIN_DDB_CHANGED_AENS) {
748                                 /* for use during init time, we only want to
749                                  * relogin non-active ddbs */
750                                 struct ddb_entry *ddb_entry;
751
752                                 ddb_entry =
753                                         /* FIXME: name length? */
754                                         qla4xxx_lookup_ddb_by_fw_index(ha,
755                                                                        mbox_sts[2]);
756                                 if (!ddb_entry)
757                                         break;
758
759                                 ddb_entry->dev_scan_wait_to_complete_relogin =
760                                         0;
761                                 ddb_entry->dev_scan_wait_to_start_relogin =
762                                         jiffies +
763                                         ((ddb_entry->default_time2wait +
764                                           4) * HZ);
765
766                                 DEBUG2(printk("scsi%ld: ddb index [%d] initate"
767                                               " RELOGIN after %d seconds\n",
768                                               ha->host_no,
769                                               ddb_entry->fw_ddb_index,
770                                               ddb_entry->default_time2wait +
771                                               4));
772                                 break;
773                         }
774
775                         if (mbox_sts[1] == 0) { /* Global DB change. */
776                                 qla4xxx_reinitialize_ddb_list(ha);
777                         } else if (mbox_sts[1] == 1) {  /* Specific device. */
778                                 qla4xxx_process_ddb_changed(ha, mbox_sts[2],
779                                                             mbox_sts[3]);
780                         }
781                         break;
782                 }
783                 spin_lock_irqsave(&ha->hardware_lock, flags);
784         }
785         spin_unlock_irqrestore(&ha->hardware_lock, flags);
786 }
787