2 * CXL Flash Device Driver
4 * Written by: Manoj N. Kumar <manoj@linux.vnet.ibm.com>, IBM Corporation
5 * Matthew R. Ochs <mrochs@linux.vnet.ibm.com>, IBM Corporation
7 * Copyright (C) 2015 IBM Corporation
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
15 #include <linux/delay.h>
16 #include <linux/list.h>
17 #include <linux/module.h>
18 #include <linux/pci.h>
20 #include <asm/unaligned.h>
24 #include <scsi/scsi_cmnd.h>
25 #include <scsi/scsi_host.h>
26 #include <uapi/scsi/cxlflash_ioctl.h>
32 MODULE_DESCRIPTION(CXLFLASH_ADAPTER_NAME
);
33 MODULE_AUTHOR("Manoj N. Kumar <manoj@linux.vnet.ibm.com>");
34 MODULE_AUTHOR("Matthew R. Ochs <mrochs@linux.vnet.ibm.com>");
35 MODULE_LICENSE("GPL");
38 * process_cmd_err() - command error handler
39 * @cmd: AFU command that experienced the error.
40 * @scp: SCSI command associated with the AFU command in error.
42 * Translates error bits from AFU command to SCSI command results.
44 static void process_cmd_err(struct afu_cmd
*cmd
, struct scsi_cmnd
*scp
)
46 struct afu
*afu
= cmd
->parent
;
47 struct cxlflash_cfg
*cfg
= afu
->parent
;
48 struct device
*dev
= &cfg
->dev
->dev
;
49 struct sisl_ioarcb
*ioarcb
;
50 struct sisl_ioasa
*ioasa
;
59 if (ioasa
->rc
.flags
& SISL_RC_FLAGS_UNDERRUN
) {
61 scsi_set_resid(scp
, resid
);
62 dev_dbg(dev
, "%s: cmd underrun cmd = %p scp = %p, resid = %d\n",
63 __func__
, cmd
, scp
, resid
);
66 if (ioasa
->rc
.flags
& SISL_RC_FLAGS_OVERRUN
) {
67 dev_dbg(dev
, "%s: cmd underrun cmd = %p scp = %p\n",
69 scp
->result
= (DID_ERROR
<< 16);
72 dev_dbg(dev
, "%s: cmd failed afu_rc=%02x scsi_rc=%02x fc_rc=%02x "
73 "afu_extra=%02x scsi_extra=%02x fc_extra=%02x\n", __func__
,
74 ioasa
->rc
.afu_rc
, ioasa
->rc
.scsi_rc
, ioasa
->rc
.fc_rc
,
75 ioasa
->afu_extra
, ioasa
->scsi_extra
, ioasa
->fc_extra
);
77 if (ioasa
->rc
.scsi_rc
) {
78 /* We have a SCSI status */
79 if (ioasa
->rc
.flags
& SISL_RC_FLAGS_SENSE_VALID
) {
80 memcpy(scp
->sense_buffer
, ioasa
->sense_data
,
82 scp
->result
= ioasa
->rc
.scsi_rc
;
84 scp
->result
= ioasa
->rc
.scsi_rc
| (DID_ERROR
<< 16);
88 * We encountered an error. Set scp->result based on nature
91 if (ioasa
->rc
.fc_rc
) {
92 /* We have an FC status */
93 switch (ioasa
->rc
.fc_rc
) {
94 case SISL_FC_RC_LINKDOWN
:
95 scp
->result
= (DID_REQUEUE
<< 16);
97 case SISL_FC_RC_RESID
:
98 /* This indicates an FCP resid underrun */
99 if (!(ioasa
->rc
.flags
& SISL_RC_FLAGS_OVERRUN
)) {
100 /* If the SISL_RC_FLAGS_OVERRUN flag was set,
101 * then we will handle this error else where.
102 * If not then we must handle it here.
103 * This is probably an AFU bug.
105 scp
->result
= (DID_ERROR
<< 16);
108 case SISL_FC_RC_RESIDERR
:
109 /* Resid mismatch between adapter and device */
110 case SISL_FC_RC_TGTABORT
:
111 case SISL_FC_RC_ABORTOK
:
112 case SISL_FC_RC_ABORTFAIL
:
113 case SISL_FC_RC_NOLOGI
:
114 case SISL_FC_RC_ABORTPEND
:
115 case SISL_FC_RC_WRABORTPEND
:
116 case SISL_FC_RC_NOEXP
:
117 case SISL_FC_RC_INUSE
:
118 scp
->result
= (DID_ERROR
<< 16);
123 if (ioasa
->rc
.afu_rc
) {
124 /* We have an AFU error */
125 switch (ioasa
->rc
.afu_rc
) {
126 case SISL_AFU_RC_NO_CHANNELS
:
127 scp
->result
= (DID_NO_CONNECT
<< 16);
129 case SISL_AFU_RC_DATA_DMA_ERR
:
130 switch (ioasa
->afu_extra
) {
131 case SISL_AFU_DMA_ERR_PAGE_IN
:
133 scp
->result
= (DID_IMM_RETRY
<< 16);
135 case SISL_AFU_DMA_ERR_INVALID_EA
:
137 scp
->result
= (DID_ERROR
<< 16);
140 case SISL_AFU_RC_OUT_OF_DATA_BUFS
:
142 scp
->result
= (DID_ALLOC_FAILURE
<< 16);
145 scp
->result
= (DID_ERROR
<< 16);
151 * cmd_complete() - command completion handler
152 * @cmd: AFU command that has completed.
154 * Prepares and submits command that has either completed or timed out to
155 * the SCSI stack. Checks AFU command back into command pool for non-internal
156 * (cmd->scp populated) commands.
158 static void cmd_complete(struct afu_cmd
*cmd
)
160 struct scsi_cmnd
*scp
;
162 struct afu
*afu
= cmd
->parent
;
163 struct cxlflash_cfg
*cfg
= afu
->parent
;
164 struct device
*dev
= &cfg
->dev
->dev
;
169 if (unlikely(cmd
->sa
.ioasc
))
170 process_cmd_err(cmd
, scp
);
172 scp
->result
= (DID_OK
<< 16);
174 cmd_is_tmf
= cmd
->cmd_tmf
;
176 dev_dbg_ratelimited(dev
, "%s:scp=%p result=%08x ioasc=%08x\n",
177 __func__
, scp
, scp
->result
, cmd
->sa
.ioasc
);
183 spin_lock_irqsave(&cfg
->tmf_slock
, lock_flags
);
184 cfg
->tmf_active
= false;
185 wake_up_all_locked(&cfg
->tmf_waitq
);
186 spin_unlock_irqrestore(&cfg
->tmf_slock
, lock_flags
);
189 complete(&cmd
->cevent
);
193 * context_reset() - reset command owner context via specified register
194 * @cmd: AFU command that timed out.
195 * @reset_reg: MMIO register to perform reset.
197 static void context_reset(struct afu_cmd
*cmd
, __be64 __iomem
*reset_reg
)
201 struct afu
*afu
= cmd
->parent
;
202 struct cxlflash_cfg
*cfg
= afu
->parent
;
203 struct device
*dev
= &cfg
->dev
->dev
;
205 dev_dbg(dev
, "%s: cmd=%p\n", __func__
, cmd
);
207 writeq_be(rrin
, reset_reg
);
209 rrin
= readq_be(reset_reg
);
212 /* Double delay each time */
214 } while (nretry
++ < MC_ROOM_RETRY_CNT
);
216 dev_dbg(dev
, "%s: returning rrin=%016llx nretry=%d\n",
217 __func__
, rrin
, nretry
);
221 * context_reset_ioarrin() - reset command owner context via IOARRIN register
222 * @cmd: AFU command that timed out.
224 static void context_reset_ioarrin(struct afu_cmd
*cmd
)
226 struct afu
*afu
= cmd
->parent
;
228 context_reset(cmd
, &afu
->host_map
->ioarrin
);
232 * context_reset_sq() - reset command owner context w/ SQ Context Reset register
233 * @cmd: AFU command that timed out.
235 static void context_reset_sq(struct afu_cmd
*cmd
)
237 struct afu
*afu
= cmd
->parent
;
239 context_reset(cmd
, &afu
->host_map
->sq_ctx_reset
);
243 * send_cmd_ioarrin() - sends an AFU command via IOARRIN register
244 * @afu: AFU associated with the host.
245 * @cmd: AFU command to send.
248 * 0 on success, SCSI_MLQUEUE_HOST_BUSY on failure
250 static int send_cmd_ioarrin(struct afu
*afu
, struct afu_cmd
*cmd
)
252 struct cxlflash_cfg
*cfg
= afu
->parent
;
253 struct device
*dev
= &cfg
->dev
->dev
;
259 * To avoid the performance penalty of MMIO, spread the update of
260 * 'room' over multiple commands.
262 spin_lock_irqsave(&afu
->rrin_slock
, lock_flags
);
263 if (--afu
->room
< 0) {
264 room
= readq_be(&afu
->host_map
->cmd_room
);
266 dev_dbg_ratelimited(dev
, "%s: no cmd_room to send "
267 "0x%02X, room=0x%016llX\n",
268 __func__
, cmd
->rcb
.cdb
[0], room
);
270 rc
= SCSI_MLQUEUE_HOST_BUSY
;
273 afu
->room
= room
- 1;
276 writeq_be((u64
)&cmd
->rcb
, &afu
->host_map
->ioarrin
);
278 spin_unlock_irqrestore(&afu
->rrin_slock
, lock_flags
);
279 dev_dbg(dev
, "%s: cmd=%p len=%u ea=%016llx rc=%d\n", __func__
,
280 cmd
, cmd
->rcb
.data_len
, cmd
->rcb
.data_ea
, rc
);
285 * send_cmd_sq() - sends an AFU command via SQ ring
286 * @afu: AFU associated with the host.
287 * @cmd: AFU command to send.
290 * 0 on success, SCSI_MLQUEUE_HOST_BUSY on failure
292 static int send_cmd_sq(struct afu
*afu
, struct afu_cmd
*cmd
)
294 struct cxlflash_cfg
*cfg
= afu
->parent
;
295 struct device
*dev
= &cfg
->dev
->dev
;
300 newval
= atomic_dec_if_positive(&afu
->hsq_credits
);
302 rc
= SCSI_MLQUEUE_HOST_BUSY
;
306 cmd
->rcb
.ioasa
= &cmd
->sa
;
308 spin_lock_irqsave(&afu
->hsq_slock
, lock_flags
);
310 *afu
->hsq_curr
= cmd
->rcb
;
311 if (afu
->hsq_curr
< afu
->hsq_end
)
314 afu
->hsq_curr
= afu
->hsq_start
;
315 writeq_be((u64
)afu
->hsq_curr
, &afu
->host_map
->sq_tail
);
317 spin_unlock_irqrestore(&afu
->hsq_slock
, lock_flags
);
319 dev_dbg(dev
, "%s: cmd=%p len=%u ea=%016llx ioasa=%p rc=%d curr=%p "
320 "head=%016llx tail=%016llx\n", __func__
, cmd
, cmd
->rcb
.data_len
,
321 cmd
->rcb
.data_ea
, cmd
->rcb
.ioasa
, rc
, afu
->hsq_curr
,
322 readq_be(&afu
->host_map
->sq_head
),
323 readq_be(&afu
->host_map
->sq_tail
));
328 * wait_resp() - polls for a response or timeout to a sent AFU command
329 * @afu: AFU associated with the host.
330 * @cmd: AFU command that was sent.
333 * 0 on success, -1 on timeout/error
335 static int wait_resp(struct afu
*afu
, struct afu_cmd
*cmd
)
337 struct cxlflash_cfg
*cfg
= afu
->parent
;
338 struct device
*dev
= &cfg
->dev
->dev
;
340 ulong timeout
= msecs_to_jiffies(cmd
->rcb
.timeout
* 2 * 1000);
342 timeout
= wait_for_completion_timeout(&cmd
->cevent
, timeout
);
344 afu
->context_reset(cmd
);
348 if (unlikely(cmd
->sa
.ioasc
!= 0)) {
349 dev_err(dev
, "%s: cmd %02x failed, ioasc=%08x\n",
350 __func__
, cmd
->rcb
.cdb
[0], cmd
->sa
.ioasc
);
358 * send_tmf() - sends a Task Management Function (TMF)
359 * @afu: AFU to checkout from.
360 * @scp: SCSI command from stack.
361 * @tmfcmd: TMF command to send.
364 * 0 on success, SCSI_MLQUEUE_HOST_BUSY on failure
366 static int send_tmf(struct afu
*afu
, struct scsi_cmnd
*scp
, u64 tmfcmd
)
368 struct cxlflash_cfg
*cfg
= shost_priv(scp
->device
->host
);
369 struct afu_cmd
*cmd
= sc_to_afucz(scp
);
370 struct device
*dev
= &cfg
->dev
->dev
;
375 /* When Task Management Function is active do not send another */
376 spin_lock_irqsave(&cfg
->tmf_slock
, lock_flags
);
378 wait_event_interruptible_lock_irq(cfg
->tmf_waitq
,
381 cfg
->tmf_active
= true;
382 spin_unlock_irqrestore(&cfg
->tmf_slock
, lock_flags
);
388 cmd
->rcb
.ctx_id
= afu
->ctx_hndl
;
389 cmd
->rcb
.msi
= SISL_MSI_RRQ_UPDATED
;
390 cmd
->rcb
.port_sel
= CHAN2PORTMASK(scp
->device
->channel
);
391 cmd
->rcb
.lun_id
= lun_to_lunid(scp
->device
->lun
);
392 cmd
->rcb
.req_flags
= (SISL_REQ_FLAGS_PORT_LUN_ID
|
393 SISL_REQ_FLAGS_SUP_UNDERRUN
|
394 SISL_REQ_FLAGS_TMF_CMD
);
395 memcpy(cmd
->rcb
.cdb
, &tmfcmd
, sizeof(tmfcmd
));
397 rc
= afu
->send_cmd(afu
, cmd
);
399 spin_lock_irqsave(&cfg
->tmf_slock
, lock_flags
);
400 cfg
->tmf_active
= false;
401 spin_unlock_irqrestore(&cfg
->tmf_slock
, lock_flags
);
405 spin_lock_irqsave(&cfg
->tmf_slock
, lock_flags
);
406 to
= msecs_to_jiffies(5000);
407 to
= wait_event_interruptible_lock_irq_timeout(cfg
->tmf_waitq
,
412 cfg
->tmf_active
= false;
413 dev_err(dev
, "%s: TMF timed out\n", __func__
);
416 spin_unlock_irqrestore(&cfg
->tmf_slock
, lock_flags
);
422 * cxlflash_driver_info() - information handler for this host driver
423 * @host: SCSI host associated with device.
425 * Return: A string describing the device.
427 static const char *cxlflash_driver_info(struct Scsi_Host
*host
)
429 return CXLFLASH_ADAPTER_NAME
;
433 * cxlflash_queuecommand() - sends a mid-layer request
434 * @host: SCSI host associated with device.
435 * @scp: SCSI command to send.
437 * Return: 0 on success, SCSI_MLQUEUE_HOST_BUSY on failure
439 static int cxlflash_queuecommand(struct Scsi_Host
*host
, struct scsi_cmnd
*scp
)
441 struct cxlflash_cfg
*cfg
= shost_priv(host
);
442 struct afu
*afu
= cfg
->afu
;
443 struct device
*dev
= &cfg
->dev
->dev
;
444 struct afu_cmd
*cmd
= sc_to_afucz(scp
);
445 struct scatterlist
*sg
= scsi_sglist(scp
);
446 u16 req_flags
= SISL_REQ_FLAGS_SUP_UNDERRUN
;
451 dev_dbg_ratelimited(dev
, "%s: (scp=%p) %d/%d/%d/%llu "
452 "cdb=(%08x-%08x-%08x-%08x)\n",
453 __func__
, scp
, host
->host_no
, scp
->device
->channel
,
454 scp
->device
->id
, scp
->device
->lun
,
455 get_unaligned_be32(&((u32
*)scp
->cmnd
)[0]),
456 get_unaligned_be32(&((u32
*)scp
->cmnd
)[1]),
457 get_unaligned_be32(&((u32
*)scp
->cmnd
)[2]),
458 get_unaligned_be32(&((u32
*)scp
->cmnd
)[3]));
461 * If a Task Management Function is active, wait for it to complete
462 * before continuing with regular commands.
464 spin_lock_irqsave(&cfg
->tmf_slock
, lock_flags
);
465 if (cfg
->tmf_active
) {
466 spin_unlock_irqrestore(&cfg
->tmf_slock
, lock_flags
);
467 rc
= SCSI_MLQUEUE_HOST_BUSY
;
470 spin_unlock_irqrestore(&cfg
->tmf_slock
, lock_flags
);
472 switch (cfg
->state
) {
474 dev_dbg_ratelimited(dev
, "%s: device is in reset\n", __func__
);
475 rc
= SCSI_MLQUEUE_HOST_BUSY
;
478 dev_dbg_ratelimited(dev
, "%s: device has failed\n", __func__
);
479 scp
->result
= (DID_NO_CONNECT
<< 16);
488 nseg
= scsi_dma_map(scp
);
489 if (unlikely(nseg
< 0)) {
490 dev_err(dev
, "%s: Fail DMA map\n", __func__
);
491 rc
= SCSI_MLQUEUE_HOST_BUSY
;
495 cmd
->rcb
.data_len
= sg_dma_len(sg
);
496 cmd
->rcb
.data_ea
= sg_dma_address(sg
);
502 cmd
->rcb
.ctx_id
= afu
->ctx_hndl
;
503 cmd
->rcb
.msi
= SISL_MSI_RRQ_UPDATED
;
504 cmd
->rcb
.port_sel
= CHAN2PORTMASK(scp
->device
->channel
);
505 cmd
->rcb
.lun_id
= lun_to_lunid(scp
->device
->lun
);
507 if (scp
->sc_data_direction
== DMA_TO_DEVICE
)
508 req_flags
|= SISL_REQ_FLAGS_HOST_WRITE
;
510 cmd
->rcb
.req_flags
= req_flags
;
511 memcpy(cmd
->rcb
.cdb
, scp
->cmnd
, sizeof(cmd
->rcb
.cdb
));
513 rc
= afu
->send_cmd(afu
, cmd
);
521 * cxlflash_wait_for_pci_err_recovery() - wait for error recovery during probe
522 * @cfg: Internal structure associated with the host.
524 static void cxlflash_wait_for_pci_err_recovery(struct cxlflash_cfg
*cfg
)
526 struct pci_dev
*pdev
= cfg
->dev
;
528 if (pci_channel_offline(pdev
))
529 wait_event_timeout(cfg
->reset_waitq
,
530 !pci_channel_offline(pdev
),
531 CXLFLASH_PCI_ERROR_RECOVERY_TIMEOUT
);
535 * free_mem() - free memory associated with the AFU
536 * @cfg: Internal structure associated with the host.
538 static void free_mem(struct cxlflash_cfg
*cfg
)
540 struct afu
*afu
= cfg
->afu
;
543 free_pages((ulong
)afu
, get_order(sizeof(struct afu
)));
549 * stop_afu() - stops the AFU command timers and unmaps the MMIO space
550 * @cfg: Internal structure associated with the host.
552 * Safe to call with AFU in a partially allocated/initialized state.
554 * Cancels scheduled worker threads, waits for any active internal AFU
555 * commands to timeout, disables IRQ polling and then unmaps the MMIO space.
557 static void stop_afu(struct cxlflash_cfg
*cfg
)
559 struct afu
*afu
= cfg
->afu
;
561 cancel_work_sync(&cfg
->work_q
);
564 while (atomic_read(&afu
->cmds_active
))
566 if (afu_is_irqpoll_enabled(afu
))
567 irq_poll_disable(&afu
->irqpoll
);
568 if (likely(afu
->afu_map
)) {
569 cxl_psa_unmap((void __iomem
*)afu
->afu_map
);
576 * term_intr() - disables all AFU interrupts
577 * @cfg: Internal structure associated with the host.
578 * @level: Depth of allocation, where to begin waterfall tear down.
580 * Safe to call with AFU/MC in partially allocated/initialized state.
582 static void term_intr(struct cxlflash_cfg
*cfg
, enum undo_level level
)
584 struct afu
*afu
= cfg
->afu
;
585 struct device
*dev
= &cfg
->dev
->dev
;
587 if (!afu
|| !cfg
->mcctx
) {
588 dev_err(dev
, "%s: returning with NULL afu or MC\n", __func__
);
594 cxl_unmap_afu_irq(cfg
->mcctx
, 3, afu
);
596 cxl_unmap_afu_irq(cfg
->mcctx
, 2, afu
);
598 cxl_unmap_afu_irq(cfg
->mcctx
, 1, afu
);
600 cxl_free_afu_irqs(cfg
->mcctx
);
603 /* No action required */
609 * term_mc() - terminates the master context
610 * @cfg: Internal structure associated with the host.
611 * @level: Depth of allocation, where to begin waterfall tear down.
613 * Safe to call with AFU/MC in partially allocated/initialized state.
615 static void term_mc(struct cxlflash_cfg
*cfg
)
618 struct afu
*afu
= cfg
->afu
;
619 struct device
*dev
= &cfg
->dev
->dev
;
621 if (!afu
|| !cfg
->mcctx
) {
622 dev_err(dev
, "%s: returning with NULL afu or MC\n", __func__
);
626 rc
= cxl_stop_context(cfg
->mcctx
);
632 * term_afu() - terminates the AFU
633 * @cfg: Internal structure associated with the host.
635 * Safe to call with AFU/MC in partially allocated/initialized state.
637 static void term_afu(struct cxlflash_cfg
*cfg
)
639 struct device
*dev
= &cfg
->dev
->dev
;
642 * Tear down is carefully orchestrated to ensure
643 * no interrupts can come in when the problem state
646 * 1) Disable all AFU interrupts
647 * 2) Unmap the problem state area
648 * 3) Stop the master context
650 term_intr(cfg
, UNMAP_THREE
);
656 dev_dbg(dev
, "%s: returning\n", __func__
);
660 * notify_shutdown() - notifies device of pending shutdown
661 * @cfg: Internal structure associated with the host.
662 * @wait: Whether to wait for shutdown processing to complete.
664 * This function will notify the AFU that the adapter is being shutdown
665 * and will wait for shutdown processing to complete if wait is true.
666 * This notification should flush pending I/Os to the device and halt
667 * further I/Os until the next AFU reset is issued and device restarted.
669 static void notify_shutdown(struct cxlflash_cfg
*cfg
, bool wait
)
671 struct afu
*afu
= cfg
->afu
;
672 struct device
*dev
= &cfg
->dev
->dev
;
673 struct dev_dependent_vals
*ddv
;
674 __be64 __iomem
*fc_port_regs
;
676 int i
, retry_cnt
= 0;
678 ddv
= (struct dev_dependent_vals
*)cfg
->dev_id
->driver_data
;
679 if (!(ddv
->flags
& CXLFLASH_NOTIFY_SHUTDOWN
))
682 if (!afu
|| !afu
->afu_map
) {
683 dev_dbg(dev
, "%s: Problem state area not mapped\n", __func__
);
688 for (i
= 0; i
< cfg
->num_fc_ports
; i
++) {
689 fc_port_regs
= get_fc_port_regs(cfg
, i
);
691 reg
= readq_be(&fc_port_regs
[FC_CONFIG2
/ 8]);
692 reg
|= SISL_FC_SHUTDOWN_NORMAL
;
693 writeq_be(reg
, &fc_port_regs
[FC_CONFIG2
/ 8]);
699 /* Wait up to 1.5 seconds for shutdown processing to complete */
700 for (i
= 0; i
< cfg
->num_fc_ports
; i
++) {
701 fc_port_regs
= get_fc_port_regs(cfg
, i
);
705 status
= readq_be(&fc_port_regs
[FC_STATUS
/ 8]);
706 if (status
& SISL_STATUS_SHUTDOWN_COMPLETE
)
708 if (++retry_cnt
>= MC_RETRY_CNT
) {
709 dev_dbg(dev
, "%s: port %d shutdown processing "
710 "not yet completed\n", __func__
, i
);
713 msleep(100 * retry_cnt
);
719 * cxlflash_remove() - PCI entry point to tear down host
720 * @pdev: PCI device associated with the host.
722 * Safe to use as a cleanup in partially allocated/initialized state.
724 static void cxlflash_remove(struct pci_dev
*pdev
)
726 struct cxlflash_cfg
*cfg
= pci_get_drvdata(pdev
);
727 struct device
*dev
= &pdev
->dev
;
730 if (!pci_is_enabled(pdev
)) {
731 dev_dbg(dev
, "%s: Device is disabled\n", __func__
);
735 /* If a Task Management Function is active, wait for it to complete
736 * before continuing with remove.
738 spin_lock_irqsave(&cfg
->tmf_slock
, lock_flags
);
740 wait_event_interruptible_lock_irq(cfg
->tmf_waitq
,
743 spin_unlock_irqrestore(&cfg
->tmf_slock
, lock_flags
);
745 /* Notify AFU and wait for shutdown processing to complete */
746 notify_shutdown(cfg
, true);
748 cfg
->state
= STATE_FAILTERM
;
749 cxlflash_stop_term_user_contexts(cfg
);
751 switch (cfg
->init_state
) {
752 case INIT_STATE_SCSI
:
753 cxlflash_term_local_luns(cfg
);
754 scsi_remove_host(cfg
->host
);
759 pci_disable_device(pdev
);
760 case INIT_STATE_NONE
:
762 scsi_host_put(cfg
->host
);
766 dev_dbg(dev
, "%s: returning\n", __func__
);
770 * alloc_mem() - allocates the AFU and its command pool
771 * @cfg: Internal structure associated with the host.
773 * A partially allocated state remains on failure.
777 * -ENOMEM on failure to allocate memory
779 static int alloc_mem(struct cxlflash_cfg
*cfg
)
782 struct device
*dev
= &cfg
->dev
->dev
;
784 /* AFU is ~28k, i.e. only one 64k page or up to seven 4k pages */
785 cfg
->afu
= (void *)__get_free_pages(GFP_KERNEL
| __GFP_ZERO
,
786 get_order(sizeof(struct afu
)));
787 if (unlikely(!cfg
->afu
)) {
788 dev_err(dev
, "%s: cannot get %d free pages\n",
789 __func__
, get_order(sizeof(struct afu
)));
793 cfg
->afu
->parent
= cfg
;
794 cfg
->afu
->afu_map
= NULL
;
800 * init_pci() - initializes the host as a PCI device
801 * @cfg: Internal structure associated with the host.
803 * Return: 0 on success, -errno on failure
805 static int init_pci(struct cxlflash_cfg
*cfg
)
807 struct pci_dev
*pdev
= cfg
->dev
;
808 struct device
*dev
= &cfg
->dev
->dev
;
811 rc
= pci_enable_device(pdev
);
812 if (rc
|| pci_channel_offline(pdev
)) {
813 if (pci_channel_offline(pdev
)) {
814 cxlflash_wait_for_pci_err_recovery(cfg
);
815 rc
= pci_enable_device(pdev
);
819 dev_err(dev
, "%s: Cannot enable adapter\n", __func__
);
820 cxlflash_wait_for_pci_err_recovery(cfg
);
826 dev_dbg(dev
, "%s: returning rc=%d\n", __func__
, rc
);
831 * init_scsi() - adds the host to the SCSI stack and kicks off host scan
832 * @cfg: Internal structure associated with the host.
834 * Return: 0 on success, -errno on failure
836 static int init_scsi(struct cxlflash_cfg
*cfg
)
838 struct pci_dev
*pdev
= cfg
->dev
;
839 struct device
*dev
= &cfg
->dev
->dev
;
842 rc
= scsi_add_host(cfg
->host
, &pdev
->dev
);
844 dev_err(dev
, "%s: scsi_add_host failed rc=%d\n", __func__
, rc
);
848 scsi_scan_host(cfg
->host
);
851 dev_dbg(dev
, "%s: returning rc=%d\n", __func__
, rc
);
856 * set_port_online() - transitions the specified host FC port to online state
857 * @fc_regs: Top of MMIO region defined for specified port.
859 * The provided MMIO region must be mapped prior to call. Online state means
860 * that the FC link layer has synced, completed the handshaking process, and
861 * is ready for login to start.
863 static void set_port_online(__be64 __iomem
*fc_regs
)
867 cmdcfg
= readq_be(&fc_regs
[FC_MTIP_CMDCONFIG
/ 8]);
868 cmdcfg
&= (~FC_MTIP_CMDCONFIG_OFFLINE
); /* clear OFF_LINE */
869 cmdcfg
|= (FC_MTIP_CMDCONFIG_ONLINE
); /* set ON_LINE */
870 writeq_be(cmdcfg
, &fc_regs
[FC_MTIP_CMDCONFIG
/ 8]);
874 * set_port_offline() - transitions the specified host FC port to offline state
875 * @fc_regs: Top of MMIO region defined for specified port.
877 * The provided MMIO region must be mapped prior to call.
879 static void set_port_offline(__be64 __iomem
*fc_regs
)
883 cmdcfg
= readq_be(&fc_regs
[FC_MTIP_CMDCONFIG
/ 8]);
884 cmdcfg
&= (~FC_MTIP_CMDCONFIG_ONLINE
); /* clear ON_LINE */
885 cmdcfg
|= (FC_MTIP_CMDCONFIG_OFFLINE
); /* set OFF_LINE */
886 writeq_be(cmdcfg
, &fc_regs
[FC_MTIP_CMDCONFIG
/ 8]);
890 * wait_port_online() - waits for the specified host FC port come online
891 * @fc_regs: Top of MMIO region defined for specified port.
892 * @delay_us: Number of microseconds to delay between reading port status.
893 * @nretry: Number of cycles to retry reading port status.
895 * The provided MMIO region must be mapped prior to call. This will timeout
896 * when the cable is not plugged in.
899 * TRUE (1) when the specified port is online
900 * FALSE (0) when the specified port fails to come online after timeout
902 static bool wait_port_online(__be64 __iomem
*fc_regs
, u32 delay_us
, u32 nretry
)
906 WARN_ON(delay_us
< 1000);
909 msleep(delay_us
/ 1000);
910 status
= readq_be(&fc_regs
[FC_MTIP_STATUS
/ 8]);
911 if (status
== U64_MAX
)
913 } while ((status
& FC_MTIP_STATUS_MASK
) != FC_MTIP_STATUS_ONLINE
&&
916 return ((status
& FC_MTIP_STATUS_MASK
) == FC_MTIP_STATUS_ONLINE
);
920 * wait_port_offline() - waits for the specified host FC port go offline
921 * @fc_regs: Top of MMIO region defined for specified port.
922 * @delay_us: Number of microseconds to delay between reading port status.
923 * @nretry: Number of cycles to retry reading port status.
925 * The provided MMIO region must be mapped prior to call.
928 * TRUE (1) when the specified port is offline
929 * FALSE (0) when the specified port fails to go offline after timeout
931 static bool wait_port_offline(__be64 __iomem
*fc_regs
, u32 delay_us
, u32 nretry
)
935 WARN_ON(delay_us
< 1000);
938 msleep(delay_us
/ 1000);
939 status
= readq_be(&fc_regs
[FC_MTIP_STATUS
/ 8]);
940 if (status
== U64_MAX
)
942 } while ((status
& FC_MTIP_STATUS_MASK
) != FC_MTIP_STATUS_OFFLINE
&&
945 return ((status
& FC_MTIP_STATUS_MASK
) == FC_MTIP_STATUS_OFFLINE
);
949 * afu_set_wwpn() - configures the WWPN for the specified host FC port
950 * @afu: AFU associated with the host that owns the specified FC port.
951 * @port: Port number being configured.
952 * @fc_regs: Top of MMIO region defined for specified port.
953 * @wwpn: The world-wide-port-number previously discovered for port.
955 * The provided MMIO region must be mapped prior to call. As part of the
956 * sequence to configure the WWPN, the port is toggled offline and then back
957 * online. This toggling action can cause this routine to delay up to a few
958 * seconds. When configured to use the internal LUN feature of the AFU, a
959 * failure to come online is overridden.
961 static void afu_set_wwpn(struct afu
*afu
, int port
, __be64 __iomem
*fc_regs
,
964 struct cxlflash_cfg
*cfg
= afu
->parent
;
965 struct device
*dev
= &cfg
->dev
->dev
;
967 set_port_offline(fc_regs
);
968 if (!wait_port_offline(fc_regs
, FC_PORT_STATUS_RETRY_INTERVAL_US
,
969 FC_PORT_STATUS_RETRY_CNT
)) {
970 dev_dbg(dev
, "%s: wait on port %d to go offline timed out\n",
974 writeq_be(wwpn
, &fc_regs
[FC_PNAME
/ 8]);
976 set_port_online(fc_regs
);
977 if (!wait_port_online(fc_regs
, FC_PORT_STATUS_RETRY_INTERVAL_US
,
978 FC_PORT_STATUS_RETRY_CNT
)) {
979 dev_dbg(dev
, "%s: wait on port %d to go online timed out\n",
985 * afu_link_reset() - resets the specified host FC port
986 * @afu: AFU associated with the host that owns the specified FC port.
987 * @port: Port number being configured.
988 * @fc_regs: Top of MMIO region defined for specified port.
990 * The provided MMIO region must be mapped prior to call. The sequence to
991 * reset the port involves toggling it offline and then back online. This
992 * action can cause this routine to delay up to a few seconds. An effort
993 * is made to maintain link with the device by switching to host to use
994 * the alternate port exclusively while the reset takes place.
995 * failure to come online is overridden.
997 static void afu_link_reset(struct afu
*afu
, int port
, __be64 __iomem
*fc_regs
)
999 struct cxlflash_cfg
*cfg
= afu
->parent
;
1000 struct device
*dev
= &cfg
->dev
->dev
;
1003 /* first switch the AFU to the other links, if any */
1004 port_sel
= readq_be(&afu
->afu_map
->global
.regs
.afu_port_sel
);
1005 port_sel
&= ~(1ULL << port
);
1006 writeq_be(port_sel
, &afu
->afu_map
->global
.regs
.afu_port_sel
);
1007 cxlflash_afu_sync(afu
, 0, 0, AFU_GSYNC
);
1009 set_port_offline(fc_regs
);
1010 if (!wait_port_offline(fc_regs
, FC_PORT_STATUS_RETRY_INTERVAL_US
,
1011 FC_PORT_STATUS_RETRY_CNT
))
1012 dev_err(dev
, "%s: wait on port %d to go offline timed out\n",
1015 set_port_online(fc_regs
);
1016 if (!wait_port_online(fc_regs
, FC_PORT_STATUS_RETRY_INTERVAL_US
,
1017 FC_PORT_STATUS_RETRY_CNT
))
1018 dev_err(dev
, "%s: wait on port %d to go online timed out\n",
1021 /* switch back to include this port */
1022 port_sel
|= (1ULL << port
);
1023 writeq_be(port_sel
, &afu
->afu_map
->global
.regs
.afu_port_sel
);
1024 cxlflash_afu_sync(afu
, 0, 0, AFU_GSYNC
);
1026 dev_dbg(dev
, "%s: returning port_sel=%016llx\n", __func__
, port_sel
);
1030 * Asynchronous interrupt information table
1032 * NOTE: The checkpatch script considers the BUILD_SISL_ASTATUS_FC_PORT macro
1033 * as complex and complains because it is not wrapped with parentheses/braces.
1035 #define ASTATUS_FC(_a, _b, _c, _d) \
1036 { SISL_ASTATUS_FC##_a##_##_b, _c, _a, (_d) }
1038 #define BUILD_SISL_ASTATUS_FC_PORT(_a) \
1039 ASTATUS_FC(_a, OTHER, "other error", CLR_FC_ERROR | LINK_RESET), \
1040 ASTATUS_FC(_a, LOGO, "target initiated LOGO", 0), \
1041 ASTATUS_FC(_a, CRC_T, "CRC threshold exceeded", LINK_RESET), \
1042 ASTATUS_FC(_a, LOGI_R, "login timed out, retrying", LINK_RESET), \
1043 ASTATUS_FC(_a, LOGI_F, "login failed", CLR_FC_ERROR), \
1044 ASTATUS_FC(_a, LOGI_S, "login succeeded", SCAN_HOST), \
1045 ASTATUS_FC(_a, LINK_DN, "link down", 0), \
1046 ASTATUS_FC(_a, LINK_UP, "link up", 0)
1048 static const struct asyc_intr_info ainfo
[] = {
1049 BUILD_SISL_ASTATUS_FC_PORT(2),
1050 BUILD_SISL_ASTATUS_FC_PORT(3),
1051 BUILD_SISL_ASTATUS_FC_PORT(0),
1052 BUILD_SISL_ASTATUS_FC_PORT(1),
1057 * find_ainfo() - locates and returns asynchronous interrupt information
1058 * @status: Status code set by AFU on error.
1060 * Return: The located information or NULL when the status code is invalid.
1062 static const struct asyc_intr_info
*find_ainfo(u64 status
)
1064 const struct asyc_intr_info
*info
;
1066 BUILD_BUG_ON(ainfo
[ARRAY_SIZE(ainfo
) - 1].status
!= 0);
1068 for (info
= &ainfo
[0]; info
->status
; info
++)
1069 if (info
->status
== status
)
1076 * afu_err_intr_init() - clears and initializes the AFU for error interrupts
1077 * @afu: AFU associated with the host.
1079 static void afu_err_intr_init(struct afu
*afu
)
1081 struct cxlflash_cfg
*cfg
= afu
->parent
;
1082 __be64 __iomem
*fc_port_regs
;
1086 /* global async interrupts: AFU clears afu_ctrl on context exit
1087 * if async interrupts were sent to that context. This prevents
1088 * the AFU form sending further async interrupts when
1090 * nobody to receive them.
1094 writeq_be(-1ULL, &afu
->afu_map
->global
.regs
.aintr_mask
);
1095 /* set LISN# to send and point to master context */
1096 reg
= ((u64
) (((afu
->ctx_hndl
<< 8) | SISL_MSI_ASYNC_ERROR
)) << 40);
1098 if (afu
->internal_lun
)
1099 reg
|= 1; /* Bit 63 indicates local lun */
1100 writeq_be(reg
, &afu
->afu_map
->global
.regs
.afu_ctrl
);
1102 writeq_be(-1ULL, &afu
->afu_map
->global
.regs
.aintr_clear
);
1103 /* unmask bits that are of interest */
1104 /* note: afu can send an interrupt after this step */
1105 writeq_be(SISL_ASTATUS_MASK
, &afu
->afu_map
->global
.regs
.aintr_mask
);
1106 /* clear again in case a bit came on after previous clear but before */
1108 writeq_be(-1ULL, &afu
->afu_map
->global
.regs
.aintr_clear
);
1110 /* Clear/Set internal lun bits */
1111 fc_port_regs
= get_fc_port_regs(cfg
, 0);
1112 reg
= readq_be(&fc_port_regs
[FC_CONFIG2
/ 8]);
1113 reg
&= SISL_FC_INTERNAL_MASK
;
1114 if (afu
->internal_lun
)
1115 reg
|= ((u64
)(afu
->internal_lun
- 1) << SISL_FC_INTERNAL_SHIFT
);
1116 writeq_be(reg
, &fc_port_regs
[FC_CONFIG2
/ 8]);
1118 /* now clear FC errors */
1119 for (i
= 0; i
< cfg
->num_fc_ports
; i
++) {
1120 fc_port_regs
= get_fc_port_regs(cfg
, i
);
1122 writeq_be(0xFFFFFFFFU
, &fc_port_regs
[FC_ERROR
/ 8]);
1123 writeq_be(0, &fc_port_regs
[FC_ERRCAP
/ 8]);
1126 /* sync interrupts for master's IOARRIN write */
1127 /* note that unlike asyncs, there can be no pending sync interrupts */
1128 /* at this time (this is a fresh context and master has not written */
1129 /* IOARRIN yet), so there is nothing to clear. */
1131 /* set LISN#, it is always sent to the context that wrote IOARRIN */
1132 writeq_be(SISL_MSI_SYNC_ERROR
, &afu
->host_map
->ctx_ctrl
);
1133 writeq_be(SISL_ISTATUS_MASK
, &afu
->host_map
->intr_mask
);
1137 * cxlflash_sync_err_irq() - interrupt handler for synchronous errors
1138 * @irq: Interrupt number.
1139 * @data: Private data provided at interrupt registration, the AFU.
1141 * Return: Always return IRQ_HANDLED.
1143 static irqreturn_t
cxlflash_sync_err_irq(int irq
, void *data
)
1145 struct afu
*afu
= (struct afu
*)data
;
1146 struct cxlflash_cfg
*cfg
= afu
->parent
;
1147 struct device
*dev
= &cfg
->dev
->dev
;
1151 reg
= readq_be(&afu
->host_map
->intr_status
);
1152 reg_unmasked
= (reg
& SISL_ISTATUS_UNMASK
);
1154 if (reg_unmasked
== 0UL) {
1155 dev_err(dev
, "%s: spurious interrupt, intr_status=%016llx\n",
1157 goto cxlflash_sync_err_irq_exit
;
1160 dev_err(dev
, "%s: unexpected interrupt, intr_status=%016llx\n",
1163 writeq_be(reg_unmasked
, &afu
->host_map
->intr_clear
);
1165 cxlflash_sync_err_irq_exit
:
1170 * process_hrrq() - process the read-response queue
1171 * @afu: AFU associated with the host.
1172 * @doneq: Queue of commands harvested from the RRQ.
1173 * @budget: Threshold of RRQ entries to process.
1175 * This routine must be called holding the disabled RRQ spin lock.
1177 * Return: The number of entries processed.
1179 static int process_hrrq(struct afu
*afu
, struct list_head
*doneq
, int budget
)
1181 struct afu_cmd
*cmd
;
1182 struct sisl_ioasa
*ioasa
;
1183 struct sisl_ioarcb
*ioarcb
;
1184 bool toggle
= afu
->toggle
;
1187 *hrrq_start
= afu
->hrrq_start
,
1188 *hrrq_end
= afu
->hrrq_end
,
1189 *hrrq_curr
= afu
->hrrq_curr
;
1191 /* Process ready RRQ entries up to the specified budget (if any) */
1195 if ((entry
& SISL_RESP_HANDLE_T_BIT
) != toggle
)
1198 entry
&= ~SISL_RESP_HANDLE_T_BIT
;
1200 if (afu_is_sq_cmd_mode(afu
)) {
1201 ioasa
= (struct sisl_ioasa
*)entry
;
1202 cmd
= container_of(ioasa
, struct afu_cmd
, sa
);
1204 ioarcb
= (struct sisl_ioarcb
*)entry
;
1205 cmd
= container_of(ioarcb
, struct afu_cmd
, rcb
);
1208 list_add_tail(&cmd
->queue
, doneq
);
1210 /* Advance to next entry or wrap and flip the toggle bit */
1211 if (hrrq_curr
< hrrq_end
)
1214 hrrq_curr
= hrrq_start
;
1215 toggle
^= SISL_RESP_HANDLE_T_BIT
;
1218 atomic_inc(&afu
->hsq_credits
);
1221 if (budget
> 0 && num_hrrq
>= budget
)
1225 afu
->hrrq_curr
= hrrq_curr
;
1226 afu
->toggle
= toggle
;
1232 * process_cmd_doneq() - process a queue of harvested RRQ commands
1233 * @doneq: Queue of completed commands.
1235 * Note that upon return the queue can no longer be trusted.
1237 static void process_cmd_doneq(struct list_head
*doneq
)
1239 struct afu_cmd
*cmd
, *tmp
;
1241 WARN_ON(list_empty(doneq
));
1243 list_for_each_entry_safe(cmd
, tmp
, doneq
, queue
)
1248 * cxlflash_irqpoll() - process a queue of harvested RRQ commands
1249 * @irqpoll: IRQ poll structure associated with queue to poll.
1250 * @budget: Threshold of RRQ entries to process per poll.
1252 * Return: The number of entries processed.
1254 static int cxlflash_irqpoll(struct irq_poll
*irqpoll
, int budget
)
1256 struct afu
*afu
= container_of(irqpoll
, struct afu
, irqpoll
);
1257 unsigned long hrrq_flags
;
1259 int num_entries
= 0;
1261 spin_lock_irqsave(&afu
->hrrq_slock
, hrrq_flags
);
1263 num_entries
= process_hrrq(afu
, &doneq
, budget
);
1264 if (num_entries
< budget
)
1265 irq_poll_complete(irqpoll
);
1267 spin_unlock_irqrestore(&afu
->hrrq_slock
, hrrq_flags
);
1269 process_cmd_doneq(&doneq
);
1274 * cxlflash_rrq_irq() - interrupt handler for read-response queue (normal path)
1275 * @irq: Interrupt number.
1276 * @data: Private data provided at interrupt registration, the AFU.
1278 * Return: IRQ_HANDLED or IRQ_NONE when no ready entries found.
1280 static irqreturn_t
cxlflash_rrq_irq(int irq
, void *data
)
1282 struct afu
*afu
= (struct afu
*)data
;
1283 unsigned long hrrq_flags
;
1285 int num_entries
= 0;
1287 spin_lock_irqsave(&afu
->hrrq_slock
, hrrq_flags
);
1289 if (afu_is_irqpoll_enabled(afu
)) {
1290 irq_poll_sched(&afu
->irqpoll
);
1291 spin_unlock_irqrestore(&afu
->hrrq_slock
, hrrq_flags
);
1295 num_entries
= process_hrrq(afu
, &doneq
, -1);
1296 spin_unlock_irqrestore(&afu
->hrrq_slock
, hrrq_flags
);
1298 if (num_entries
== 0)
1301 process_cmd_doneq(&doneq
);
1306 * cxlflash_async_err_irq() - interrupt handler for asynchronous errors
1307 * @irq: Interrupt number.
1308 * @data: Private data provided at interrupt registration, the AFU.
1310 * Return: Always return IRQ_HANDLED.
1312 static irqreturn_t
cxlflash_async_err_irq(int irq
, void *data
)
1314 struct afu
*afu
= (struct afu
*)data
;
1315 struct cxlflash_cfg
*cfg
= afu
->parent
;
1316 struct device
*dev
= &cfg
->dev
->dev
;
1318 const struct asyc_intr_info
*info
;
1319 struct sisl_global_map __iomem
*global
= &afu
->afu_map
->global
;
1320 __be64 __iomem
*fc_port_regs
;
1325 reg
= readq_be(&global
->regs
.aintr_status
);
1326 reg_unmasked
= (reg
& SISL_ASTATUS_UNMASK
);
1328 if (reg_unmasked
== 0) {
1329 dev_err(dev
, "%s: spurious interrupt, aintr_status=%016llx\n",
1334 /* FYI, it is 'okay' to clear AFU status before FC_ERROR */
1335 writeq_be(reg_unmasked
, &global
->regs
.aintr_clear
);
1337 /* Check each bit that is on */
1338 for (i
= 0; reg_unmasked
; i
++, reg_unmasked
= (reg_unmasked
>> 1)) {
1339 info
= find_ainfo(1ULL << i
);
1340 if (((reg_unmasked
& 0x1) == 0) || !info
)
1344 fc_port_regs
= get_fc_port_regs(cfg
, port
);
1346 dev_err(dev
, "%s: FC Port %d -> %s, fc_status=%016llx\n",
1347 __func__
, port
, info
->desc
,
1348 readq_be(&fc_port_regs
[FC_STATUS
/ 8]));
1351 * Do link reset first, some OTHER errors will set FC_ERROR
1352 * again if cleared before or w/o a reset
1354 if (info
->action
& LINK_RESET
) {
1355 dev_err(dev
, "%s: FC Port %d: resetting link\n",
1357 cfg
->lr_state
= LINK_RESET_REQUIRED
;
1358 cfg
->lr_port
= port
;
1359 schedule_work(&cfg
->work_q
);
1362 if (info
->action
& CLR_FC_ERROR
) {
1363 reg
= readq_be(&fc_port_regs
[FC_ERROR
/ 8]);
1366 * Since all errors are unmasked, FC_ERROR and FC_ERRCAP
1367 * should be the same and tracing one is sufficient.
1370 dev_err(dev
, "%s: fc %d: clearing fc_error=%016llx\n",
1371 __func__
, port
, reg
);
1373 writeq_be(reg
, &fc_port_regs
[FC_ERROR
/ 8]);
1374 writeq_be(0, &fc_port_regs
[FC_ERRCAP
/ 8]);
1377 if (info
->action
& SCAN_HOST
) {
1378 atomic_inc(&cfg
->scan_host_needed
);
1379 schedule_work(&cfg
->work_q
);
1388 * start_context() - starts the master context
1389 * @cfg: Internal structure associated with the host.
1391 * Return: A success or failure value from CXL services.
1393 static int start_context(struct cxlflash_cfg
*cfg
)
1395 struct device
*dev
= &cfg
->dev
->dev
;
1398 rc
= cxl_start_context(cfg
->mcctx
,
1399 cfg
->afu
->work
.work_element_descriptor
,
1402 dev_dbg(dev
, "%s: returning rc=%d\n", __func__
, rc
);
1407 * read_vpd() - obtains the WWPNs from VPD
1408 * @cfg: Internal structure associated with the host.
1409 * @wwpn: Array of size MAX_FC_PORTS to pass back WWPNs
1411 * Return: 0 on success, -errno on failure
1413 static int read_vpd(struct cxlflash_cfg
*cfg
, u64 wwpn
[])
1415 struct device
*dev
= &cfg
->dev
->dev
;
1416 struct pci_dev
*pdev
= cfg
->dev
;
1418 int ro_start
, ro_size
, i
, j
, k
;
1420 char vpd_data
[CXLFLASH_VPD_LEN
];
1421 char tmp_buf
[WWPN_BUF_LEN
] = { 0 };
1422 char *wwpn_vpd_tags
[MAX_FC_PORTS
] = { "V5", "V6", "V7", "V8" };
1424 /* Get the VPD data from the device */
1425 vpd_size
= cxl_read_adapter_vpd(pdev
, vpd_data
, sizeof(vpd_data
));
1426 if (unlikely(vpd_size
<= 0)) {
1427 dev_err(dev
, "%s: Unable to read VPD (size = %ld)\n",
1428 __func__
, vpd_size
);
1433 /* Get the read only section offset */
1434 ro_start
= pci_vpd_find_tag(vpd_data
, 0, vpd_size
,
1435 PCI_VPD_LRDT_RO_DATA
);
1436 if (unlikely(ro_start
< 0)) {
1437 dev_err(dev
, "%s: VPD Read-only data not found\n", __func__
);
1442 /* Get the read only section size, cap when extends beyond read VPD */
1443 ro_size
= pci_vpd_lrdt_size(&vpd_data
[ro_start
]);
1445 i
= ro_start
+ PCI_VPD_LRDT_TAG_SIZE
;
1446 if (unlikely((i
+ j
) > vpd_size
)) {
1447 dev_dbg(dev
, "%s: Might need to read more VPD (%d > %ld)\n",
1448 __func__
, (i
+ j
), vpd_size
);
1449 ro_size
= vpd_size
- i
;
1453 * Find the offset of the WWPN tag within the read only
1454 * VPD data and validate the found field (partials are
1455 * no good to us). Convert the ASCII data to an integer
1456 * value. Note that we must copy to a temporary buffer
1457 * because the conversion service requires that the ASCII
1458 * string be terminated.
1460 for (k
= 0; k
< cfg
->num_fc_ports
; k
++) {
1462 i
= ro_start
+ PCI_VPD_LRDT_TAG_SIZE
;
1464 i
= pci_vpd_find_info_keyword(vpd_data
, i
, j
, wwpn_vpd_tags
[k
]);
1465 if (unlikely(i
< 0)) {
1466 dev_err(dev
, "%s: Port %d WWPN not found in VPD\n",
1472 j
= pci_vpd_info_field_size(&vpd_data
[i
]);
1473 i
+= PCI_VPD_INFO_FLD_HDR_SIZE
;
1474 if (unlikely((i
+ j
> vpd_size
) || (j
!= WWPN_LEN
))) {
1475 dev_err(dev
, "%s: Port %d WWPN incomplete or bad VPD\n",
1481 memcpy(tmp_buf
, &vpd_data
[i
], WWPN_LEN
);
1482 rc
= kstrtoul(tmp_buf
, WWPN_LEN
, (ulong
*)&wwpn
[k
]);
1484 dev_err(dev
, "%s: WWPN conversion failed for port %d\n",
1490 dev_dbg(dev
, "%s: wwpn%d=%016llx\n", __func__
, k
, wwpn
[k
]);
1494 dev_dbg(dev
, "%s: returning rc=%d\n", __func__
, rc
);
1499 * init_pcr() - initialize the provisioning and control registers
1500 * @cfg: Internal structure associated with the host.
1502 * Also sets up fast access to the mapped registers and initializes AFU
1503 * command fields that never change.
1505 static void init_pcr(struct cxlflash_cfg
*cfg
)
1507 struct afu
*afu
= cfg
->afu
;
1508 struct sisl_ctrl_map __iomem
*ctrl_map
;
1511 for (i
= 0; i
< MAX_CONTEXT
; i
++) {
1512 ctrl_map
= &afu
->afu_map
->ctrls
[i
].ctrl
;
1513 /* Disrupt any clients that could be running */
1514 /* e.g. clients that survived a master restart */
1515 writeq_be(0, &ctrl_map
->rht_start
);
1516 writeq_be(0, &ctrl_map
->rht_cnt_id
);
1517 writeq_be(0, &ctrl_map
->ctx_cap
);
1520 /* Copy frequently used fields into afu */
1521 afu
->ctx_hndl
= (u16
) cxl_process_element(cfg
->mcctx
);
1522 afu
->host_map
= &afu
->afu_map
->hosts
[afu
->ctx_hndl
].host
;
1523 afu
->ctrl_map
= &afu
->afu_map
->ctrls
[afu
->ctx_hndl
].ctrl
;
1525 /* Program the Endian Control for the master context */
1526 writeq_be(SISL_ENDIAN_CTRL
, &afu
->host_map
->endian_ctrl
);
1530 * init_global() - initialize AFU global registers
1531 * @cfg: Internal structure associated with the host.
1533 static int init_global(struct cxlflash_cfg
*cfg
)
1535 struct afu
*afu
= cfg
->afu
;
1536 struct device
*dev
= &cfg
->dev
->dev
;
1537 __be64 __iomem
*fc_port_regs
;
1538 u64 wwpn
[MAX_FC_PORTS
]; /* wwpn of AFU ports */
1539 int i
= 0, num_ports
= 0;
1543 rc
= read_vpd(cfg
, &wwpn
[0]);
1545 dev_err(dev
, "%s: could not read vpd rc=%d\n", __func__
, rc
);
1549 /* Set up RRQ and SQ in AFU for master issued cmds */
1550 writeq_be((u64
) afu
->hrrq_start
, &afu
->host_map
->rrq_start
);
1551 writeq_be((u64
) afu
->hrrq_end
, &afu
->host_map
->rrq_end
);
1553 if (afu_is_sq_cmd_mode(afu
)) {
1554 writeq_be((u64
)afu
->hsq_start
, &afu
->host_map
->sq_start
);
1555 writeq_be((u64
)afu
->hsq_end
, &afu
->host_map
->sq_end
);
1558 /* AFU configuration */
1559 reg
= readq_be(&afu
->afu_map
->global
.regs
.afu_config
);
1560 reg
|= SISL_AFUCONF_AR_ALL
|SISL_AFUCONF_ENDIAN
;
1561 /* enable all auto retry options and control endianness */
1562 /* leave others at default: */
1563 /* CTX_CAP write protected, mbox_r does not clear on read and */
1564 /* checker on if dual afu */
1565 writeq_be(reg
, &afu
->afu_map
->global
.regs
.afu_config
);
1567 /* Global port select: select either port */
1568 if (afu
->internal_lun
) {
1569 /* Only use port 0 */
1570 writeq_be(PORT0
, &afu
->afu_map
->global
.regs
.afu_port_sel
);
1573 writeq_be(PORT_MASK(cfg
->num_fc_ports
),
1574 &afu
->afu_map
->global
.regs
.afu_port_sel
);
1575 num_ports
= cfg
->num_fc_ports
;
1578 for (i
= 0; i
< num_ports
; i
++) {
1579 fc_port_regs
= get_fc_port_regs(cfg
, i
);
1581 /* Unmask all errors (but they are still masked at AFU) */
1582 writeq_be(0, &fc_port_regs
[FC_ERRMSK
/ 8]);
1583 /* Clear CRC error cnt & set a threshold */
1584 (void)readq_be(&fc_port_regs
[FC_CNT_CRCERR
/ 8]);
1585 writeq_be(MC_CRC_THRESH
, &fc_port_regs
[FC_CRC_THRESH
/ 8]);
1587 /* Set WWPNs. If already programmed, wwpn[i] is 0 */
1589 afu_set_wwpn(afu
, i
, &fc_port_regs
[0], wwpn
[i
]);
1590 /* Programming WWPN back to back causes additional
1591 * offline/online transitions and a PLOGI
1596 /* Set up master's own CTX_CAP to allow real mode, host translation */
1597 /* tables, afu cmds and read/write GSCSI cmds. */
1598 /* First, unlock ctx_cap write by reading mbox */
1599 (void)readq_be(&afu
->ctrl_map
->mbox_r
); /* unlock ctx_cap */
1600 writeq_be((SISL_CTX_CAP_REAL_MODE
| SISL_CTX_CAP_HOST_XLATE
|
1601 SISL_CTX_CAP_READ_CMD
| SISL_CTX_CAP_WRITE_CMD
|
1602 SISL_CTX_CAP_AFU_CMD
| SISL_CTX_CAP_GSCSI_CMD
),
1603 &afu
->ctrl_map
->ctx_cap
);
1604 /* Initialize heartbeat */
1605 afu
->hb
= readq_be(&afu
->afu_map
->global
.regs
.afu_hb
);
1611 * start_afu() - initializes and starts the AFU
1612 * @cfg: Internal structure associated with the host.
1614 static int start_afu(struct cxlflash_cfg
*cfg
)
1616 struct afu
*afu
= cfg
->afu
;
1617 struct device
*dev
= &cfg
->dev
->dev
;
1622 /* Initialize RRQ */
1623 memset(&afu
->rrq_entry
, 0, sizeof(afu
->rrq_entry
));
1624 afu
->hrrq_start
= &afu
->rrq_entry
[0];
1625 afu
->hrrq_end
= &afu
->rrq_entry
[NUM_RRQ_ENTRY
- 1];
1626 afu
->hrrq_curr
= afu
->hrrq_start
;
1628 spin_lock_init(&afu
->hrrq_slock
);
1631 if (afu_is_sq_cmd_mode(afu
)) {
1632 memset(&afu
->sq
, 0, sizeof(afu
->sq
));
1633 afu
->hsq_start
= &afu
->sq
[0];
1634 afu
->hsq_end
= &afu
->sq
[NUM_SQ_ENTRY
- 1];
1635 afu
->hsq_curr
= afu
->hsq_start
;
1637 spin_lock_init(&afu
->hsq_slock
);
1638 atomic_set(&afu
->hsq_credits
, NUM_SQ_ENTRY
- 1);
1641 /* Initialize IRQ poll */
1642 if (afu_is_irqpoll_enabled(afu
))
1643 irq_poll_init(&afu
->irqpoll
, afu
->irqpoll_weight
,
1646 rc
= init_global(cfg
);
1648 dev_dbg(dev
, "%s: returning rc=%d\n", __func__
, rc
);
1653 * init_intr() - setup interrupt handlers for the master context
1654 * @cfg: Internal structure associated with the host.
1656 * Return: 0 on success, -errno on failure
1658 static enum undo_level
init_intr(struct cxlflash_cfg
*cfg
,
1659 struct cxl_context
*ctx
)
1661 struct afu
*afu
= cfg
->afu
;
1662 struct device
*dev
= &cfg
->dev
->dev
;
1664 enum undo_level level
= UNDO_NOOP
;
1666 rc
= cxl_allocate_afu_irqs(ctx
, 3);
1668 dev_err(dev
, "%s: allocate_afu_irqs failed rc=%d\n",
1674 rc
= cxl_map_afu_irq(ctx
, 1, cxlflash_sync_err_irq
, afu
,
1675 "SISL_MSI_SYNC_ERROR");
1676 if (unlikely(rc
<= 0)) {
1677 dev_err(dev
, "%s: SISL_MSI_SYNC_ERROR map failed\n", __func__
);
1682 rc
= cxl_map_afu_irq(ctx
, 2, cxlflash_rrq_irq
, afu
,
1683 "SISL_MSI_RRQ_UPDATED");
1684 if (unlikely(rc
<= 0)) {
1685 dev_err(dev
, "%s: SISL_MSI_RRQ_UPDATED map failed\n", __func__
);
1690 rc
= cxl_map_afu_irq(ctx
, 3, cxlflash_async_err_irq
, afu
,
1691 "SISL_MSI_ASYNC_ERROR");
1692 if (unlikely(rc
<= 0)) {
1693 dev_err(dev
, "%s: SISL_MSI_ASYNC_ERROR map failed\n", __func__
);
1702 * init_mc() - create and register as the master context
1703 * @cfg: Internal structure associated with the host.
1705 * Return: 0 on success, -errno on failure
1707 static int init_mc(struct cxlflash_cfg
*cfg
)
1709 struct cxl_context
*ctx
;
1710 struct device
*dev
= &cfg
->dev
->dev
;
1712 enum undo_level level
;
1714 ctx
= cxl_get_context(cfg
->dev
);
1715 if (unlikely(!ctx
)) {
1721 /* Set it up as a master with the CXL */
1722 cxl_set_master(ctx
);
1724 /* During initialization reset the AFU to start from a clean slate */
1725 rc
= cxl_afu_reset(cfg
->mcctx
);
1727 dev_err(dev
, "%s: AFU reset failed rc=%d\n", __func__
, rc
);
1731 level
= init_intr(cfg
, ctx
);
1732 if (unlikely(level
)) {
1733 dev_err(dev
, "%s: interrupt init failed rc=%d\n", __func__
, rc
);
1737 /* This performs the equivalent of the CXL_IOCTL_START_WORK.
1738 * The CXL_IOCTL_GET_PROCESS_ELEMENT is implicit in the process
1739 * element (pe) that is embedded in the context (ctx)
1741 rc
= start_context(cfg
);
1743 dev_err(dev
, "%s: start context failed rc=%d\n", __func__
, rc
);
1744 level
= UNMAP_THREE
;
1748 dev_dbg(dev
, "%s: returning rc=%d\n", __func__
, rc
);
1751 term_intr(cfg
, level
);
1756 * get_num_afu_ports() - determines and configures the number of AFU ports
1757 * @cfg: Internal structure associated with the host.
1759 * This routine determines the number of AFU ports by converting the global
1760 * port selection mask. The converted value is only valid following an AFU
1761 * reset (explicit or power-on). This routine must be invoked shortly after
1762 * mapping as other routines are dependent on the number of ports during the
1763 * initialization sequence.
1765 * To support legacy AFUs that might not have reflected an initial global
1766 * port mask (value read is 0), default to the number of ports originally
1767 * supported by the cxlflash driver (2) before hardware with other port
1768 * offerings was introduced.
1770 static void get_num_afu_ports(struct cxlflash_cfg
*cfg
)
1772 struct afu
*afu
= cfg
->afu
;
1773 struct device
*dev
= &cfg
->dev
->dev
;
1775 int num_fc_ports
= LEGACY_FC_PORTS
;
1777 port_mask
= readq_be(&afu
->afu_map
->global
.regs
.afu_port_sel
);
1778 if (port_mask
!= 0ULL)
1779 num_fc_ports
= min(ilog2(port_mask
) + 1, MAX_FC_PORTS
);
1781 dev_dbg(dev
, "%s: port_mask=%016llx num_fc_ports=%d\n",
1782 __func__
, port_mask
, num_fc_ports
);
1784 cfg
->num_fc_ports
= num_fc_ports
;
1785 cfg
->host
->max_channel
= PORTNUM2CHAN(num_fc_ports
);
1789 * init_afu() - setup as master context and start AFU
1790 * @cfg: Internal structure associated with the host.
1792 * This routine is a higher level of control for configuring the
1793 * AFU on probe and reset paths.
1795 * Return: 0 on success, -errno on failure
1797 static int init_afu(struct cxlflash_cfg
*cfg
)
1801 struct afu
*afu
= cfg
->afu
;
1802 struct device
*dev
= &cfg
->dev
->dev
;
1804 cxl_perst_reloads_same_image(cfg
->cxl_afu
, true);
1808 dev_err(dev
, "%s: init_mc failed rc=%d\n",
1813 /* Map the entire MMIO space of the AFU */
1814 afu
->afu_map
= cxl_psa_map(cfg
->mcctx
);
1815 if (!afu
->afu_map
) {
1816 dev_err(dev
, "%s: cxl_psa_map failed\n", __func__
);
1821 /* No byte reverse on reading afu_version or string will be backwards */
1822 reg
= readq(&afu
->afu_map
->global
.regs
.afu_version
);
1823 memcpy(afu
->version
, ®
, sizeof(reg
));
1824 afu
->interface_version
=
1825 readq_be(&afu
->afu_map
->global
.regs
.interface_version
);
1826 if ((afu
->interface_version
+ 1) == 0) {
1827 dev_err(dev
, "Back level AFU, please upgrade. AFU version %s "
1828 "interface version %016llx\n", afu
->version
,
1829 afu
->interface_version
);
1834 if (afu_is_sq_cmd_mode(afu
)) {
1835 afu
->send_cmd
= send_cmd_sq
;
1836 afu
->context_reset
= context_reset_sq
;
1838 afu
->send_cmd
= send_cmd_ioarrin
;
1839 afu
->context_reset
= context_reset_ioarrin
;
1842 dev_dbg(dev
, "%s: afu_ver=%s interface_ver=%016llx\n", __func__
,
1843 afu
->version
, afu
->interface_version
);
1845 get_num_afu_ports(cfg
);
1847 rc
= start_afu(cfg
);
1849 dev_err(dev
, "%s: start_afu failed, rc=%d\n", __func__
, rc
);
1853 afu_err_intr_init(cfg
->afu
);
1854 spin_lock_init(&afu
->rrin_slock
);
1855 afu
->room
= readq_be(&afu
->host_map
->cmd_room
);
1857 /* Restore the LUN mappings */
1858 cxlflash_restore_luntable(cfg
);
1860 dev_dbg(dev
, "%s: returning rc=%d\n", __func__
, rc
);
1864 term_intr(cfg
, UNMAP_THREE
);
1870 * cxlflash_afu_sync() - builds and sends an AFU sync command
1871 * @afu: AFU associated with the host.
1872 * @ctx_hndl_u: Identifies context requesting sync.
1873 * @res_hndl_u: Identifies resource requesting sync.
1874 * @mode: Type of sync to issue (lightweight, heavyweight, global).
1876 * The AFU can only take 1 sync command at a time. This routine enforces this
1877 * limitation by using a mutex to provide exclusive access to the AFU during
1878 * the sync. This design point requires calling threads to not be on interrupt
1879 * context due to the possibility of sleeping during concurrent sync operations.
1881 * AFU sync operations are only necessary and allowed when the device is
1882 * operating normally. When not operating normally, sync requests can occur as
1883 * part of cleaning up resources associated with an adapter prior to removal.
1884 * In this scenario, these requests are simply ignored (safe due to the AFU
1891 int cxlflash_afu_sync(struct afu
*afu
, ctx_hndl_t ctx_hndl_u
,
1892 res_hndl_t res_hndl_u
, u8 mode
)
1894 struct cxlflash_cfg
*cfg
= afu
->parent
;
1895 struct device
*dev
= &cfg
->dev
->dev
;
1896 struct afu_cmd
*cmd
= NULL
;
1899 static DEFINE_MUTEX(sync_active
);
1901 if (cfg
->state
!= STATE_NORMAL
) {
1902 dev_dbg(dev
, "%s: Sync not required state=%u\n",
1903 __func__
, cfg
->state
);
1907 mutex_lock(&sync_active
);
1908 atomic_inc(&afu
->cmds_active
);
1909 buf
= kzalloc(sizeof(*cmd
) + __alignof__(*cmd
) - 1, GFP_KERNEL
);
1910 if (unlikely(!buf
)) {
1911 dev_err(dev
, "%s: no memory for command\n", __func__
);
1916 cmd
= (struct afu_cmd
*)PTR_ALIGN(buf
, __alignof__(*cmd
));
1917 init_completion(&cmd
->cevent
);
1920 dev_dbg(dev
, "%s: afu=%p cmd=%p %d\n", __func__
, afu
, cmd
, ctx_hndl_u
);
1922 cmd
->rcb
.req_flags
= SISL_REQ_FLAGS_AFU_CMD
;
1923 cmd
->rcb
.ctx_id
= afu
->ctx_hndl
;
1924 cmd
->rcb
.msi
= SISL_MSI_RRQ_UPDATED
;
1925 cmd
->rcb
.timeout
= MC_AFU_SYNC_TIMEOUT
;
1927 cmd
->rcb
.cdb
[0] = 0xC0; /* AFU Sync */
1928 cmd
->rcb
.cdb
[1] = mode
;
1930 /* The cdb is aligned, no unaligned accessors required */
1931 *((__be16
*)&cmd
->rcb
.cdb
[2]) = cpu_to_be16(ctx_hndl_u
);
1932 *((__be32
*)&cmd
->rcb
.cdb
[4]) = cpu_to_be32(res_hndl_u
);
1934 rc
= afu
->send_cmd(afu
, cmd
);
1938 rc
= wait_resp(afu
, cmd
);
1942 atomic_dec(&afu
->cmds_active
);
1943 mutex_unlock(&sync_active
);
1945 dev_dbg(dev
, "%s: returning rc=%d\n", __func__
, rc
);
1950 * afu_reset() - resets the AFU
1951 * @cfg: Internal structure associated with the host.
1953 * Return: 0 on success, -errno on failure
1955 static int afu_reset(struct cxlflash_cfg
*cfg
)
1957 struct device
*dev
= &cfg
->dev
->dev
;
1960 /* Stop the context before the reset. Since the context is
1961 * no longer available restart it after the reset is complete
1967 dev_dbg(dev
, "%s: returning rc=%d\n", __func__
, rc
);
1972 * drain_ioctls() - wait until all currently executing ioctls have completed
1973 * @cfg: Internal structure associated with the host.
1975 * Obtain write access to read/write semaphore that wraps ioctl
1976 * handling to 'drain' ioctls currently executing.
1978 static void drain_ioctls(struct cxlflash_cfg
*cfg
)
1980 down_write(&cfg
->ioctl_rwsem
);
1981 up_write(&cfg
->ioctl_rwsem
);
1985 * cxlflash_eh_device_reset_handler() - reset a single LUN
1986 * @scp: SCSI command to send.
1989 * SUCCESS as defined in scsi/scsi.h
1990 * FAILED as defined in scsi/scsi.h
1992 static int cxlflash_eh_device_reset_handler(struct scsi_cmnd
*scp
)
1995 struct Scsi_Host
*host
= scp
->device
->host
;
1996 struct cxlflash_cfg
*cfg
= shost_priv(host
);
1997 struct device
*dev
= &cfg
->dev
->dev
;
1998 struct afu
*afu
= cfg
->afu
;
2001 dev_dbg(dev
, "%s: (scp=%p) %d/%d/%d/%llu "
2002 "cdb=(%08x-%08x-%08x-%08x)\n", __func__
, scp
, host
->host_no
,
2003 scp
->device
->channel
, scp
->device
->id
, scp
->device
->lun
,
2004 get_unaligned_be32(&((u32
*)scp
->cmnd
)[0]),
2005 get_unaligned_be32(&((u32
*)scp
->cmnd
)[1]),
2006 get_unaligned_be32(&((u32
*)scp
->cmnd
)[2]),
2007 get_unaligned_be32(&((u32
*)scp
->cmnd
)[3]));
2010 switch (cfg
->state
) {
2012 rcr
= send_tmf(afu
, scp
, TMF_LUN_RESET
);
2017 wait_event(cfg
->reset_waitq
, cfg
->state
!= STATE_RESET
);
2024 dev_dbg(dev
, "%s: returning rc=%d\n", __func__
, rc
);
2029 * cxlflash_eh_host_reset_handler() - reset the host adapter
2030 * @scp: SCSI command from stack identifying host.
2032 * Following a reset, the state is evaluated again in case an EEH occurred
2033 * during the reset. In such a scenario, the host reset will either yield
2034 * until the EEH recovery is complete or return success or failure based
2035 * upon the current device state.
2038 * SUCCESS as defined in scsi/scsi.h
2039 * FAILED as defined in scsi/scsi.h
2041 static int cxlflash_eh_host_reset_handler(struct scsi_cmnd
*scp
)
2045 struct Scsi_Host
*host
= scp
->device
->host
;
2046 struct cxlflash_cfg
*cfg
= shost_priv(host
);
2047 struct device
*dev
= &cfg
->dev
->dev
;
2049 dev_dbg(dev
, "%s: (scp=%p) %d/%d/%d/%llu "
2050 "cdb=(%08x-%08x-%08x-%08x)\n", __func__
, scp
, host
->host_no
,
2051 scp
->device
->channel
, scp
->device
->id
, scp
->device
->lun
,
2052 get_unaligned_be32(&((u32
*)scp
->cmnd
)[0]),
2053 get_unaligned_be32(&((u32
*)scp
->cmnd
)[1]),
2054 get_unaligned_be32(&((u32
*)scp
->cmnd
)[2]),
2055 get_unaligned_be32(&((u32
*)scp
->cmnd
)[3]));
2057 switch (cfg
->state
) {
2059 cfg
->state
= STATE_RESET
;
2061 cxlflash_mark_contexts_error(cfg
);
2062 rcr
= afu_reset(cfg
);
2065 cfg
->state
= STATE_FAILTERM
;
2067 cfg
->state
= STATE_NORMAL
;
2068 wake_up_all(&cfg
->reset_waitq
);
2072 wait_event(cfg
->reset_waitq
, cfg
->state
!= STATE_RESET
);
2073 if (cfg
->state
== STATE_NORMAL
)
2081 dev_dbg(dev
, "%s: returning rc=%d\n", __func__
, rc
);
2086 * cxlflash_change_queue_depth() - change the queue depth for the device
2087 * @sdev: SCSI device destined for queue depth change.
2088 * @qdepth: Requested queue depth value to set.
2090 * The requested queue depth is capped to the maximum supported value.
2092 * Return: The actual queue depth set.
2094 static int cxlflash_change_queue_depth(struct scsi_device
*sdev
, int qdepth
)
2097 if (qdepth
> CXLFLASH_MAX_CMDS_PER_LUN
)
2098 qdepth
= CXLFLASH_MAX_CMDS_PER_LUN
;
2100 scsi_change_queue_depth(sdev
, qdepth
);
2101 return sdev
->queue_depth
;
2105 * cxlflash_show_port_status() - queries and presents the current port status
2106 * @port: Desired port for status reporting.
2107 * @cfg: Internal structure associated with the host.
2108 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
2110 * Return: The size of the ASCII string returned in @buf or -EINVAL.
2112 static ssize_t
cxlflash_show_port_status(u32 port
,
2113 struct cxlflash_cfg
*cfg
,
2116 struct device
*dev
= &cfg
->dev
->dev
;
2119 __be64 __iomem
*fc_port_regs
;
2121 WARN_ON(port
>= MAX_FC_PORTS
);
2123 if (port
>= cfg
->num_fc_ports
) {
2124 dev_info(dev
, "%s: Port %d not supported on this card.\n",
2129 fc_port_regs
= get_fc_port_regs(cfg
, port
);
2130 status
= readq_be(&fc_port_regs
[FC_MTIP_STATUS
/ 8]);
2131 status
&= FC_MTIP_STATUS_MASK
;
2133 if (status
== FC_MTIP_STATUS_ONLINE
)
2134 disp_status
= "online";
2135 else if (status
== FC_MTIP_STATUS_OFFLINE
)
2136 disp_status
= "offline";
2138 disp_status
= "unknown";
2140 return scnprintf(buf
, PAGE_SIZE
, "%s\n", disp_status
);
2144 * port0_show() - queries and presents the current status of port 0
2145 * @dev: Generic device associated with the host owning the port.
2146 * @attr: Device attribute representing the port.
2147 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
2149 * Return: The size of the ASCII string returned in @buf.
2151 static ssize_t
port0_show(struct device
*dev
,
2152 struct device_attribute
*attr
,
2155 struct cxlflash_cfg
*cfg
= shost_priv(class_to_shost(dev
));
2157 return cxlflash_show_port_status(0, cfg
, buf
);
2161 * port1_show() - queries and presents the current status of port 1
2162 * @dev: Generic device associated with the host owning the port.
2163 * @attr: Device attribute representing the port.
2164 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
2166 * Return: The size of the ASCII string returned in @buf.
2168 static ssize_t
port1_show(struct device
*dev
,
2169 struct device_attribute
*attr
,
2172 struct cxlflash_cfg
*cfg
= shost_priv(class_to_shost(dev
));
2174 return cxlflash_show_port_status(1, cfg
, buf
);
2178 * port2_show() - queries and presents the current status of port 2
2179 * @dev: Generic device associated with the host owning the port.
2180 * @attr: Device attribute representing the port.
2181 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
2183 * Return: The size of the ASCII string returned in @buf.
2185 static ssize_t
port2_show(struct device
*dev
,
2186 struct device_attribute
*attr
,
2189 struct cxlflash_cfg
*cfg
= shost_priv(class_to_shost(dev
));
2191 return cxlflash_show_port_status(2, cfg
, buf
);
2195 * port3_show() - queries and presents the current status of port 3
2196 * @dev: Generic device associated with the host owning the port.
2197 * @attr: Device attribute representing the port.
2198 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
2200 * Return: The size of the ASCII string returned in @buf.
2202 static ssize_t
port3_show(struct device
*dev
,
2203 struct device_attribute
*attr
,
2206 struct cxlflash_cfg
*cfg
= shost_priv(class_to_shost(dev
));
2208 return cxlflash_show_port_status(3, cfg
, buf
);
2212 * lun_mode_show() - presents the current LUN mode of the host
2213 * @dev: Generic device associated with the host.
2214 * @attr: Device attribute representing the LUN mode.
2215 * @buf: Buffer of length PAGE_SIZE to report back the LUN mode in ASCII.
2217 * Return: The size of the ASCII string returned in @buf.
2219 static ssize_t
lun_mode_show(struct device
*dev
,
2220 struct device_attribute
*attr
, char *buf
)
2222 struct cxlflash_cfg
*cfg
= shost_priv(class_to_shost(dev
));
2223 struct afu
*afu
= cfg
->afu
;
2225 return scnprintf(buf
, PAGE_SIZE
, "%u\n", afu
->internal_lun
);
2229 * lun_mode_store() - sets the LUN mode of the host
2230 * @dev: Generic device associated with the host.
2231 * @attr: Device attribute representing the LUN mode.
2232 * @buf: Buffer of length PAGE_SIZE containing the LUN mode in ASCII.
2233 * @count: Length of data resizing in @buf.
2235 * The CXL Flash AFU supports a dummy LUN mode where the external
2236 * links and storage are not required. Space on the FPGA is used
2237 * to create 1 or 2 small LUNs which are presented to the system
2238 * as if they were a normal storage device. This feature is useful
2239 * during development and also provides manufacturing with a way
2240 * to test the AFU without an actual device.
2242 * 0 = external LUN[s] (default)
2243 * 1 = internal LUN (1 x 64K, 512B blocks, id 0)
2244 * 2 = internal LUN (1 x 64K, 4K blocks, id 0)
2245 * 3 = internal LUN (2 x 32K, 512B blocks, ids 0,1)
2246 * 4 = internal LUN (2 x 32K, 4K blocks, ids 0,1)
2248 * Return: The size of the ASCII string returned in @buf.
2250 static ssize_t
lun_mode_store(struct device
*dev
,
2251 struct device_attribute
*attr
,
2252 const char *buf
, size_t count
)
2254 struct Scsi_Host
*shost
= class_to_shost(dev
);
2255 struct cxlflash_cfg
*cfg
= shost_priv(shost
);
2256 struct afu
*afu
= cfg
->afu
;
2260 rc
= kstrtouint(buf
, 10, &lun_mode
);
2261 if (!rc
&& (lun_mode
< 5) && (lun_mode
!= afu
->internal_lun
)) {
2262 afu
->internal_lun
= lun_mode
;
2265 * When configured for internal LUN, there is only one channel,
2266 * channel number 0, else there will be one less than the number
2267 * of fc ports for this card.
2269 if (afu
->internal_lun
)
2270 shost
->max_channel
= 0;
2272 shost
->max_channel
= PORTNUM2CHAN(cfg
->num_fc_ports
);
2275 scsi_scan_host(cfg
->host
);
2282 * ioctl_version_show() - presents the current ioctl version of the host
2283 * @dev: Generic device associated with the host.
2284 * @attr: Device attribute representing the ioctl version.
2285 * @buf: Buffer of length PAGE_SIZE to report back the ioctl version.
2287 * Return: The size of the ASCII string returned in @buf.
2289 static ssize_t
ioctl_version_show(struct device
*dev
,
2290 struct device_attribute
*attr
, char *buf
)
2292 return scnprintf(buf
, PAGE_SIZE
, "%u\n", DK_CXLFLASH_VERSION_0
);
2296 * cxlflash_show_port_lun_table() - queries and presents the port LUN table
2297 * @port: Desired port for status reporting.
2298 * @cfg: Internal structure associated with the host.
2299 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
2301 * Return: The size of the ASCII string returned in @buf or -EINVAL.
2303 static ssize_t
cxlflash_show_port_lun_table(u32 port
,
2304 struct cxlflash_cfg
*cfg
,
2307 struct device
*dev
= &cfg
->dev
->dev
;
2308 __be64 __iomem
*fc_port_luns
;
2312 WARN_ON(port
>= MAX_FC_PORTS
);
2314 if (port
>= cfg
->num_fc_ports
) {
2315 dev_info(dev
, "%s: Port %d not supported on this card.\n",
2320 fc_port_luns
= get_fc_port_luns(cfg
, port
);
2322 for (i
= 0; i
< CXLFLASH_NUM_VLUNS
; i
++)
2323 bytes
+= scnprintf(buf
+ bytes
, PAGE_SIZE
- bytes
,
2325 i
, readq_be(&fc_port_luns
[i
]));
2330 * port0_lun_table_show() - presents the current LUN table of port 0
2331 * @dev: Generic device associated with the host owning the port.
2332 * @attr: Device attribute representing the port.
2333 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
2335 * Return: The size of the ASCII string returned in @buf.
2337 static ssize_t
port0_lun_table_show(struct device
*dev
,
2338 struct device_attribute
*attr
,
2341 struct cxlflash_cfg
*cfg
= shost_priv(class_to_shost(dev
));
2343 return cxlflash_show_port_lun_table(0, cfg
, buf
);
2347 * port1_lun_table_show() - presents the current LUN table of port 1
2348 * @dev: Generic device associated with the host owning the port.
2349 * @attr: Device attribute representing the port.
2350 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
2352 * Return: The size of the ASCII string returned in @buf.
2354 static ssize_t
port1_lun_table_show(struct device
*dev
,
2355 struct device_attribute
*attr
,
2358 struct cxlflash_cfg
*cfg
= shost_priv(class_to_shost(dev
));
2360 return cxlflash_show_port_lun_table(1, cfg
, buf
);
2364 * port2_lun_table_show() - presents the current LUN table of port 2
2365 * @dev: Generic device associated with the host owning the port.
2366 * @attr: Device attribute representing the port.
2367 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
2369 * Return: The size of the ASCII string returned in @buf.
2371 static ssize_t
port2_lun_table_show(struct device
*dev
,
2372 struct device_attribute
*attr
,
2375 struct cxlflash_cfg
*cfg
= shost_priv(class_to_shost(dev
));
2377 return cxlflash_show_port_lun_table(2, cfg
, buf
);
2381 * port3_lun_table_show() - presents the current LUN table of port 3
2382 * @dev: Generic device associated with the host owning the port.
2383 * @attr: Device attribute representing the port.
2384 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
2386 * Return: The size of the ASCII string returned in @buf.
2388 static ssize_t
port3_lun_table_show(struct device
*dev
,
2389 struct device_attribute
*attr
,
2392 struct cxlflash_cfg
*cfg
= shost_priv(class_to_shost(dev
));
2394 return cxlflash_show_port_lun_table(3, cfg
, buf
);
2398 * irqpoll_weight_show() - presents the current IRQ poll weight for the host
2399 * @dev: Generic device associated with the host.
2400 * @attr: Device attribute representing the IRQ poll weight.
2401 * @buf: Buffer of length PAGE_SIZE to report back the current IRQ poll
2404 * An IRQ poll weight of 0 indicates polling is disabled.
2406 * Return: The size of the ASCII string returned in @buf.
2408 static ssize_t
irqpoll_weight_show(struct device
*dev
,
2409 struct device_attribute
*attr
, char *buf
)
2411 struct cxlflash_cfg
*cfg
= shost_priv(class_to_shost(dev
));
2412 struct afu
*afu
= cfg
->afu
;
2414 return scnprintf(buf
, PAGE_SIZE
, "%u\n", afu
->irqpoll_weight
);
2418 * irqpoll_weight_store() - sets the current IRQ poll weight for the host
2419 * @dev: Generic device associated with the host.
2420 * @attr: Device attribute representing the IRQ poll weight.
2421 * @buf: Buffer of length PAGE_SIZE containing the desired IRQ poll
2423 * @count: Length of data resizing in @buf.
2425 * An IRQ poll weight of 0 indicates polling is disabled.
2427 * Return: The size of the ASCII string returned in @buf.
2429 static ssize_t
irqpoll_weight_store(struct device
*dev
,
2430 struct device_attribute
*attr
,
2431 const char *buf
, size_t count
)
2433 struct cxlflash_cfg
*cfg
= shost_priv(class_to_shost(dev
));
2434 struct device
*cfgdev
= &cfg
->dev
->dev
;
2435 struct afu
*afu
= cfg
->afu
;
2439 rc
= kstrtouint(buf
, 10, &weight
);
2445 "Invalid IRQ poll weight. It must be 256 or less.\n");
2449 if (weight
== afu
->irqpoll_weight
) {
2451 "Current IRQ poll weight has the same weight.\n");
2455 if (afu_is_irqpoll_enabled(afu
))
2456 irq_poll_disable(&afu
->irqpoll
);
2458 afu
->irqpoll_weight
= weight
;
2461 irq_poll_init(&afu
->irqpoll
, weight
, cxlflash_irqpoll
);
2467 * mode_show() - presents the current mode of the device
2468 * @dev: Generic device associated with the device.
2469 * @attr: Device attribute representing the device mode.
2470 * @buf: Buffer of length PAGE_SIZE to report back the dev mode in ASCII.
2472 * Return: The size of the ASCII string returned in @buf.
2474 static ssize_t
mode_show(struct device
*dev
,
2475 struct device_attribute
*attr
, char *buf
)
2477 struct scsi_device
*sdev
= to_scsi_device(dev
);
2479 return scnprintf(buf
, PAGE_SIZE
, "%s\n",
2480 sdev
->hostdata
? "superpipe" : "legacy");
2486 static DEVICE_ATTR_RO(port0
);
2487 static DEVICE_ATTR_RO(port1
);
2488 static DEVICE_ATTR_RO(port2
);
2489 static DEVICE_ATTR_RO(port3
);
2490 static DEVICE_ATTR_RW(lun_mode
);
2491 static DEVICE_ATTR_RO(ioctl_version
);
2492 static DEVICE_ATTR_RO(port0_lun_table
);
2493 static DEVICE_ATTR_RO(port1_lun_table
);
2494 static DEVICE_ATTR_RO(port2_lun_table
);
2495 static DEVICE_ATTR_RO(port3_lun_table
);
2496 static DEVICE_ATTR_RW(irqpoll_weight
);
2498 static struct device_attribute
*cxlflash_host_attrs
[] = {
2504 &dev_attr_ioctl_version
,
2505 &dev_attr_port0_lun_table
,
2506 &dev_attr_port1_lun_table
,
2507 &dev_attr_port2_lun_table
,
2508 &dev_attr_port3_lun_table
,
2509 &dev_attr_irqpoll_weight
,
2516 static DEVICE_ATTR_RO(mode
);
2518 static struct device_attribute
*cxlflash_dev_attrs
[] = {
2526 static struct scsi_host_template driver_template
= {
2527 .module
= THIS_MODULE
,
2528 .name
= CXLFLASH_ADAPTER_NAME
,
2529 .info
= cxlflash_driver_info
,
2530 .ioctl
= cxlflash_ioctl
,
2531 .proc_name
= CXLFLASH_NAME
,
2532 .queuecommand
= cxlflash_queuecommand
,
2533 .eh_device_reset_handler
= cxlflash_eh_device_reset_handler
,
2534 .eh_host_reset_handler
= cxlflash_eh_host_reset_handler
,
2535 .change_queue_depth
= cxlflash_change_queue_depth
,
2536 .cmd_per_lun
= CXLFLASH_MAX_CMDS_PER_LUN
,
2537 .can_queue
= CXLFLASH_MAX_CMDS
,
2538 .cmd_size
= sizeof(struct afu_cmd
) + __alignof__(struct afu_cmd
) - 1,
2540 .sg_tablesize
= 1, /* No scatter gather support */
2541 .max_sectors
= CXLFLASH_MAX_SECTORS
,
2542 .use_clustering
= ENABLE_CLUSTERING
,
2543 .shost_attrs
= cxlflash_host_attrs
,
2544 .sdev_attrs
= cxlflash_dev_attrs
,
2548 * Device dependent values
2550 static struct dev_dependent_vals dev_corsa_vals
= { CXLFLASH_MAX_SECTORS
,
2552 static struct dev_dependent_vals dev_flash_gt_vals
= { CXLFLASH_MAX_SECTORS
,
2553 CXLFLASH_NOTIFY_SHUTDOWN
};
2554 static struct dev_dependent_vals dev_briard_vals
= { CXLFLASH_MAX_SECTORS
,
2555 CXLFLASH_NOTIFY_SHUTDOWN
};
2558 * PCI device binding table
2560 static struct pci_device_id cxlflash_pci_table
[] = {
2561 {PCI_VENDOR_ID_IBM
, PCI_DEVICE_ID_IBM_CORSA
,
2562 PCI_ANY_ID
, PCI_ANY_ID
, 0, 0, (kernel_ulong_t
)&dev_corsa_vals
},
2563 {PCI_VENDOR_ID_IBM
, PCI_DEVICE_ID_IBM_FLASH_GT
,
2564 PCI_ANY_ID
, PCI_ANY_ID
, 0, 0, (kernel_ulong_t
)&dev_flash_gt_vals
},
2565 {PCI_VENDOR_ID_IBM
, PCI_DEVICE_ID_IBM_BRIARD
,
2566 PCI_ANY_ID
, PCI_ANY_ID
, 0, 0, (kernel_ulong_t
)&dev_briard_vals
},
2570 MODULE_DEVICE_TABLE(pci
, cxlflash_pci_table
);
2573 * cxlflash_worker_thread() - work thread handler for the AFU
2574 * @work: Work structure contained within cxlflash associated with host.
2576 * Handles the following events:
2577 * - Link reset which cannot be performed on interrupt context due to
2578 * blocking up to a few seconds
2581 static void cxlflash_worker_thread(struct work_struct
*work
)
2583 struct cxlflash_cfg
*cfg
= container_of(work
, struct cxlflash_cfg
,
2585 struct afu
*afu
= cfg
->afu
;
2586 struct device
*dev
= &cfg
->dev
->dev
;
2587 __be64 __iomem
*fc_port_regs
;
2591 /* Avoid MMIO if the device has failed */
2593 if (cfg
->state
!= STATE_NORMAL
)
2596 spin_lock_irqsave(cfg
->host
->host_lock
, lock_flags
);
2598 if (cfg
->lr_state
== LINK_RESET_REQUIRED
) {
2599 port
= cfg
->lr_port
;
2601 dev_err(dev
, "%s: invalid port index %d\n",
2604 spin_unlock_irqrestore(cfg
->host
->host_lock
,
2607 /* The reset can block... */
2608 fc_port_regs
= get_fc_port_regs(cfg
, port
);
2609 afu_link_reset(afu
, port
, fc_port_regs
);
2610 spin_lock_irqsave(cfg
->host
->host_lock
, lock_flags
);
2613 cfg
->lr_state
= LINK_RESET_COMPLETE
;
2616 spin_unlock_irqrestore(cfg
->host
->host_lock
, lock_flags
);
2618 if (atomic_dec_if_positive(&cfg
->scan_host_needed
) >= 0)
2619 scsi_scan_host(cfg
->host
);
2623 * cxlflash_probe() - PCI entry point to add host
2624 * @pdev: PCI device associated with the host.
2625 * @dev_id: PCI device id associated with device.
2627 * Return: 0 on success, -errno on failure
2629 static int cxlflash_probe(struct pci_dev
*pdev
,
2630 const struct pci_device_id
*dev_id
)
2632 struct Scsi_Host
*host
;
2633 struct cxlflash_cfg
*cfg
= NULL
;
2634 struct device
*dev
= &pdev
->dev
;
2635 struct dev_dependent_vals
*ddv
;
2639 dev_dbg(&pdev
->dev
, "%s: Found CXLFLASH with IRQ: %d\n",
2640 __func__
, pdev
->irq
);
2642 ddv
= (struct dev_dependent_vals
*)dev_id
->driver_data
;
2643 driver_template
.max_sectors
= ddv
->max_sectors
;
2645 host
= scsi_host_alloc(&driver_template
, sizeof(struct cxlflash_cfg
));
2647 dev_err(dev
, "%s: scsi_host_alloc failed\n", __func__
);
2652 host
->max_id
= CXLFLASH_MAX_NUM_TARGETS_PER_BUS
;
2653 host
->max_lun
= CXLFLASH_MAX_NUM_LUNS_PER_TARGET
;
2654 host
->unique_id
= host
->host_no
;
2655 host
->max_cmd_len
= CXLFLASH_MAX_CDB_LEN
;
2657 cfg
= shost_priv(host
);
2659 rc
= alloc_mem(cfg
);
2661 dev_err(dev
, "%s: alloc_mem failed\n", __func__
);
2663 scsi_host_put(cfg
->host
);
2667 cfg
->init_state
= INIT_STATE_NONE
;
2669 cfg
->cxl_fops
= cxlflash_cxl_fops
;
2672 * Promoted LUNs move to the top of the LUN table. The rest stay on
2673 * the bottom half. The bottom half grows from the end (index = 255),
2674 * whereas the top half grows from the beginning (index = 0).
2676 * Initialize the last LUN index for all possible ports.
2678 cfg
->promote_lun_index
= 0;
2680 for (k
= 0; k
< MAX_FC_PORTS
; k
++)
2681 cfg
->last_lun_index
[k
] = CXLFLASH_NUM_VLUNS
/2 - 1;
2683 cfg
->dev_id
= (struct pci_device_id
*)dev_id
;
2685 init_waitqueue_head(&cfg
->tmf_waitq
);
2686 init_waitqueue_head(&cfg
->reset_waitq
);
2688 INIT_WORK(&cfg
->work_q
, cxlflash_worker_thread
);
2689 cfg
->lr_state
= LINK_RESET_INVALID
;
2691 spin_lock_init(&cfg
->tmf_slock
);
2692 mutex_init(&cfg
->ctx_tbl_list_mutex
);
2693 mutex_init(&cfg
->ctx_recovery_mutex
);
2694 init_rwsem(&cfg
->ioctl_rwsem
);
2695 INIT_LIST_HEAD(&cfg
->ctx_err_recovery
);
2696 INIT_LIST_HEAD(&cfg
->lluns
);
2698 pci_set_drvdata(pdev
, cfg
);
2700 cfg
->cxl_afu
= cxl_pci_to_afu(pdev
);
2704 dev_err(dev
, "%s: init_pci failed rc=%d\n", __func__
, rc
);
2707 cfg
->init_state
= INIT_STATE_PCI
;
2711 dev_err(dev
, "%s: init_afu failed rc=%d\n", __func__
, rc
);
2714 cfg
->init_state
= INIT_STATE_AFU
;
2716 rc
= init_scsi(cfg
);
2718 dev_err(dev
, "%s: init_scsi failed rc=%d\n", __func__
, rc
);
2721 cfg
->init_state
= INIT_STATE_SCSI
;
2724 dev_dbg(dev
, "%s: returning rc=%d\n", __func__
, rc
);
2728 cxlflash_remove(pdev
);
2733 * cxlflash_pci_error_detected() - called when a PCI error is detected
2734 * @pdev: PCI device struct.
2735 * @state: PCI channel state.
2737 * When an EEH occurs during an active reset, wait until the reset is
2738 * complete and then take action based upon the device state.
2740 * Return: PCI_ERS_RESULT_NEED_RESET or PCI_ERS_RESULT_DISCONNECT
2742 static pci_ers_result_t
cxlflash_pci_error_detected(struct pci_dev
*pdev
,
2743 pci_channel_state_t state
)
2746 struct cxlflash_cfg
*cfg
= pci_get_drvdata(pdev
);
2747 struct device
*dev
= &cfg
->dev
->dev
;
2749 dev_dbg(dev
, "%s: pdev=%p state=%u\n", __func__
, pdev
, state
);
2752 case pci_channel_io_frozen
:
2753 wait_event(cfg
->reset_waitq
, cfg
->state
!= STATE_RESET
);
2754 if (cfg
->state
== STATE_FAILTERM
)
2755 return PCI_ERS_RESULT_DISCONNECT
;
2757 cfg
->state
= STATE_RESET
;
2758 scsi_block_requests(cfg
->host
);
2760 rc
= cxlflash_mark_contexts_error(cfg
);
2762 dev_err(dev
, "%s: Failed to mark user contexts rc=%d\n",
2765 return PCI_ERS_RESULT_NEED_RESET
;
2766 case pci_channel_io_perm_failure
:
2767 cfg
->state
= STATE_FAILTERM
;
2768 wake_up_all(&cfg
->reset_waitq
);
2769 scsi_unblock_requests(cfg
->host
);
2770 return PCI_ERS_RESULT_DISCONNECT
;
2774 return PCI_ERS_RESULT_NEED_RESET
;
2778 * cxlflash_pci_slot_reset() - called when PCI slot has been reset
2779 * @pdev: PCI device struct.
2781 * This routine is called by the pci error recovery code after the PCI
2782 * slot has been reset, just before we should resume normal operations.
2784 * Return: PCI_ERS_RESULT_RECOVERED or PCI_ERS_RESULT_DISCONNECT
2786 static pci_ers_result_t
cxlflash_pci_slot_reset(struct pci_dev
*pdev
)
2789 struct cxlflash_cfg
*cfg
= pci_get_drvdata(pdev
);
2790 struct device
*dev
= &cfg
->dev
->dev
;
2792 dev_dbg(dev
, "%s: pdev=%p\n", __func__
, pdev
);
2796 dev_err(dev
, "%s: EEH recovery failed rc=%d\n", __func__
, rc
);
2797 return PCI_ERS_RESULT_DISCONNECT
;
2800 return PCI_ERS_RESULT_RECOVERED
;
2804 * cxlflash_pci_resume() - called when normal operation can resume
2805 * @pdev: PCI device struct
2807 static void cxlflash_pci_resume(struct pci_dev
*pdev
)
2809 struct cxlflash_cfg
*cfg
= pci_get_drvdata(pdev
);
2810 struct device
*dev
= &cfg
->dev
->dev
;
2812 dev_dbg(dev
, "%s: pdev=%p\n", __func__
, pdev
);
2814 cfg
->state
= STATE_NORMAL
;
2815 wake_up_all(&cfg
->reset_waitq
);
2816 scsi_unblock_requests(cfg
->host
);
2819 static const struct pci_error_handlers cxlflash_err_handler
= {
2820 .error_detected
= cxlflash_pci_error_detected
,
2821 .slot_reset
= cxlflash_pci_slot_reset
,
2822 .resume
= cxlflash_pci_resume
,
2826 * PCI device structure
2828 static struct pci_driver cxlflash_driver
= {
2829 .name
= CXLFLASH_NAME
,
2830 .id_table
= cxlflash_pci_table
,
2831 .probe
= cxlflash_probe
,
2832 .remove
= cxlflash_remove
,
2833 .shutdown
= cxlflash_remove
,
2834 .err_handler
= &cxlflash_err_handler
,
2838 * init_cxlflash() - module entry point
2840 * Return: 0 on success, -errno on failure
2842 static int __init
init_cxlflash(void)
2844 cxlflash_list_init();
2846 return pci_register_driver(&cxlflash_driver
);
2850 * exit_cxlflash() - module exit point
2852 static void __exit
exit_cxlflash(void)
2854 cxlflash_term_global_luns();
2855 cxlflash_free_errpage();
2857 pci_unregister_driver(&cxlflash_driver
);
2860 module_init(init_cxlflash
);
2861 module_exit(exit_cxlflash
);