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 sisl_ioarcb
*ioarcb
;
47 struct sisl_ioasa
*ioasa
;
56 if (ioasa
->rc
.flags
& SISL_RC_FLAGS_UNDERRUN
) {
58 scsi_set_resid(scp
, resid
);
59 pr_debug("%s: cmd underrun cmd = %p scp = %p, resid = %d\n",
60 __func__
, cmd
, scp
, resid
);
63 if (ioasa
->rc
.flags
& SISL_RC_FLAGS_OVERRUN
) {
64 pr_debug("%s: cmd underrun cmd = %p scp = %p\n",
66 scp
->result
= (DID_ERROR
<< 16);
69 pr_debug("%s: cmd failed afu_rc=%d scsi_rc=%d fc_rc=%d "
70 "afu_extra=0x%X, scsi_extra=0x%X, fc_extra=0x%X\n",
71 __func__
, ioasa
->rc
.afu_rc
, ioasa
->rc
.scsi_rc
,
72 ioasa
->rc
.fc_rc
, ioasa
->afu_extra
, ioasa
->scsi_extra
,
75 if (ioasa
->rc
.scsi_rc
) {
76 /* We have a SCSI status */
77 if (ioasa
->rc
.flags
& SISL_RC_FLAGS_SENSE_VALID
) {
78 memcpy(scp
->sense_buffer
, ioasa
->sense_data
,
80 scp
->result
= ioasa
->rc
.scsi_rc
;
82 scp
->result
= ioasa
->rc
.scsi_rc
| (DID_ERROR
<< 16);
86 * We encountered an error. Set scp->result based on nature
89 if (ioasa
->rc
.fc_rc
) {
90 /* We have an FC status */
91 switch (ioasa
->rc
.fc_rc
) {
92 case SISL_FC_RC_LINKDOWN
:
93 scp
->result
= (DID_REQUEUE
<< 16);
95 case SISL_FC_RC_RESID
:
96 /* This indicates an FCP resid underrun */
97 if (!(ioasa
->rc
.flags
& SISL_RC_FLAGS_OVERRUN
)) {
98 /* If the SISL_RC_FLAGS_OVERRUN flag was set,
99 * then we will handle this error else where.
100 * If not then we must handle it here.
101 * This is probably an AFU bug.
103 scp
->result
= (DID_ERROR
<< 16);
106 case SISL_FC_RC_RESIDERR
:
107 /* Resid mismatch between adapter and device */
108 case SISL_FC_RC_TGTABORT
:
109 case SISL_FC_RC_ABORTOK
:
110 case SISL_FC_RC_ABORTFAIL
:
111 case SISL_FC_RC_NOLOGI
:
112 case SISL_FC_RC_ABORTPEND
:
113 case SISL_FC_RC_WRABORTPEND
:
114 case SISL_FC_RC_NOEXP
:
115 case SISL_FC_RC_INUSE
:
116 scp
->result
= (DID_ERROR
<< 16);
121 if (ioasa
->rc
.afu_rc
) {
122 /* We have an AFU error */
123 switch (ioasa
->rc
.afu_rc
) {
124 case SISL_AFU_RC_NO_CHANNELS
:
125 scp
->result
= (DID_NO_CONNECT
<< 16);
127 case SISL_AFU_RC_DATA_DMA_ERR
:
128 switch (ioasa
->afu_extra
) {
129 case SISL_AFU_DMA_ERR_PAGE_IN
:
131 scp
->result
= (DID_IMM_RETRY
<< 16);
133 case SISL_AFU_DMA_ERR_INVALID_EA
:
135 scp
->result
= (DID_ERROR
<< 16);
138 case SISL_AFU_RC_OUT_OF_DATA_BUFS
:
140 scp
->result
= (DID_ALLOC_FAILURE
<< 16);
143 scp
->result
= (DID_ERROR
<< 16);
149 * cmd_complete() - command completion handler
150 * @cmd: AFU command that has completed.
152 * Prepares and submits command that has either completed or timed out to
153 * the SCSI stack. Checks AFU command back into command pool for non-internal
154 * (rcb.scp populated) commands.
156 static void cmd_complete(struct afu_cmd
*cmd
)
158 struct scsi_cmnd
*scp
;
160 struct afu
*afu
= cmd
->parent
;
161 struct cxlflash_cfg
*cfg
= afu
->parent
;
166 if (unlikely(cmd
->sa
.ioasc
))
167 process_cmd_err(cmd
, scp
);
169 scp
->result
= (DID_OK
<< 16);
171 cmd_is_tmf
= cmd
->cmd_tmf
;
173 pr_debug_ratelimited("%s: calling scsi_done scp=%p result=%X "
174 "ioasc=%d\n", __func__
, scp
, scp
->result
,
181 spin_lock_irqsave(&cfg
->tmf_slock
, lock_flags
);
182 cfg
->tmf_active
= false;
183 wake_up_all_locked(&cfg
->tmf_waitq
);
184 spin_unlock_irqrestore(&cfg
->tmf_slock
, lock_flags
);
187 complete(&cmd
->cevent
);
191 * context_reset() - timeout handler for AFU commands
192 * @cmd: AFU command that timed out.
194 * Sends a reset to the AFU.
196 static void context_reset(struct afu_cmd
*cmd
)
200 struct afu
*afu
= cmd
->parent
;
201 struct cxlflash_cfg
*cfg
= afu
->parent
;
202 struct device
*dev
= &cfg
->dev
->dev
;
204 pr_debug("%s: cmd=%p\n", __func__
, cmd
);
206 writeq_be(rrin
, &afu
->host_map
->ioarrin
);
208 rrin
= readq_be(&afu
->host_map
->ioarrin
);
211 /* Double delay each time */
213 } while (nretry
++ < MC_ROOM_RETRY_CNT
);
215 dev_dbg(dev
, "%s: returning rrin=0x%016llX nretry=%d\n",
216 __func__
, rrin
, nretry
);
220 * send_cmd() - sends an AFU command
221 * @afu: AFU associated with the host.
222 * @cmd: AFU command to send.
225 * 0 on success, SCSI_MLQUEUE_HOST_BUSY on failure
227 static int send_cmd(struct afu
*afu
, struct afu_cmd
*cmd
)
229 struct cxlflash_cfg
*cfg
= afu
->parent
;
230 struct device
*dev
= &cfg
->dev
->dev
;
236 * To avoid the performance penalty of MMIO, spread the update of
237 * 'room' over multiple commands.
239 spin_lock_irqsave(&afu
->rrin_slock
, lock_flags
);
240 if (--afu
->room
< 0) {
241 room
= readq_be(&afu
->host_map
->cmd_room
);
243 dev_dbg_ratelimited(dev
, "%s: no cmd_room to send "
244 "0x%02X, room=0x%016llX\n",
245 __func__
, cmd
->rcb
.cdb
[0], room
);
247 rc
= SCSI_MLQUEUE_HOST_BUSY
;
250 afu
->room
= room
- 1;
253 writeq_be((u64
)&cmd
->rcb
, &afu
->host_map
->ioarrin
);
255 spin_unlock_irqrestore(&afu
->rrin_slock
, lock_flags
);
256 pr_devel("%s: cmd=%p len=%d ea=%p rc=%d\n", __func__
, cmd
,
257 cmd
->rcb
.data_len
, (void *)cmd
->rcb
.data_ea
, rc
);
262 * wait_resp() - polls for a response or timeout to a sent AFU command
263 * @afu: AFU associated with the host.
264 * @cmd: AFU command that was sent.
267 * 0 on success, -1 on timeout/error
269 static int wait_resp(struct afu
*afu
, struct afu_cmd
*cmd
)
272 ulong timeout
= msecs_to_jiffies(cmd
->rcb
.timeout
* 2 * 1000);
274 timeout
= wait_for_completion_timeout(&cmd
->cevent
, timeout
);
280 if (unlikely(cmd
->sa
.ioasc
!= 0)) {
281 pr_err("%s: CMD 0x%X failed, IOASC: flags 0x%X, afu_rc 0x%X, "
282 "scsi_rc 0x%X, fc_rc 0x%X\n", __func__
, cmd
->rcb
.cdb
[0],
283 cmd
->sa
.rc
.flags
, cmd
->sa
.rc
.afu_rc
, cmd
->sa
.rc
.scsi_rc
,
292 * send_tmf() - sends a Task Management Function (TMF)
293 * @afu: AFU to checkout from.
294 * @scp: SCSI command from stack.
295 * @tmfcmd: TMF command to send.
298 * 0 on success, SCSI_MLQUEUE_HOST_BUSY on failure
300 static int send_tmf(struct afu
*afu
, struct scsi_cmnd
*scp
, u64 tmfcmd
)
302 struct afu_cmd
*cmd
= sc_to_afucz(scp
);
304 u32 port_sel
= scp
->device
->channel
+ 1;
306 struct Scsi_Host
*host
= scp
->device
->host
;
307 struct cxlflash_cfg
*cfg
= (struct cxlflash_cfg
*)host
->hostdata
;
308 struct device
*dev
= &cfg
->dev
->dev
;
313 /* When Task Management Function is active do not send another */
314 spin_lock_irqsave(&cfg
->tmf_slock
, lock_flags
);
316 wait_event_interruptible_lock_irq(cfg
->tmf_waitq
,
319 cfg
->tmf_active
= true;
321 spin_unlock_irqrestore(&cfg
->tmf_slock
, lock_flags
);
323 cmd
->rcb
.ctx_id
= afu
->ctx_hndl
;
324 cmd
->rcb
.msi
= SISL_MSI_RRQ_UPDATED
;
325 cmd
->rcb
.port_sel
= port_sel
;
326 cmd
->rcb
.lun_id
= lun_to_lunid(scp
->device
->lun
);
328 lflag
= SISL_REQ_FLAGS_TMF_CMD
;
330 cmd
->rcb
.req_flags
= (SISL_REQ_FLAGS_PORT_LUN_ID
|
331 SISL_REQ_FLAGS_SUP_UNDERRUN
| lflag
);
333 /* Stash the scp in the command, for reuse during interrupt */
337 /* Copy the CDB from the cmd passed in */
338 memcpy(cmd
->rcb
.cdb
, &tmfcmd
, sizeof(tmfcmd
));
340 /* Send the command */
341 rc
= send_cmd(afu
, cmd
);
343 spin_lock_irqsave(&cfg
->tmf_slock
, lock_flags
);
344 cfg
->tmf_active
= false;
345 spin_unlock_irqrestore(&cfg
->tmf_slock
, lock_flags
);
349 spin_lock_irqsave(&cfg
->tmf_slock
, lock_flags
);
350 to
= msecs_to_jiffies(5000);
351 to
= wait_event_interruptible_lock_irq_timeout(cfg
->tmf_waitq
,
356 cfg
->tmf_active
= false;
357 dev_err(dev
, "%s: TMF timed out!\n", __func__
);
360 spin_unlock_irqrestore(&cfg
->tmf_slock
, lock_flags
);
365 static void afu_unmap(struct kref
*ref
)
367 struct afu
*afu
= container_of(ref
, struct afu
, mapcount
);
369 if (likely(afu
->afu_map
)) {
370 cxl_psa_unmap((void __iomem
*)afu
->afu_map
);
376 * cxlflash_driver_info() - information handler for this host driver
377 * @host: SCSI host associated with device.
379 * Return: A string describing the device.
381 static const char *cxlflash_driver_info(struct Scsi_Host
*host
)
383 return CXLFLASH_ADAPTER_NAME
;
387 * cxlflash_queuecommand() - sends a mid-layer request
388 * @host: SCSI host associated with device.
389 * @scp: SCSI command to send.
391 * Return: 0 on success, SCSI_MLQUEUE_HOST_BUSY on failure
393 static int cxlflash_queuecommand(struct Scsi_Host
*host
, struct scsi_cmnd
*scp
)
395 struct cxlflash_cfg
*cfg
= (struct cxlflash_cfg
*)host
->hostdata
;
396 struct afu
*afu
= cfg
->afu
;
397 struct device
*dev
= &cfg
->dev
->dev
;
398 struct afu_cmd
*cmd
= sc_to_afucz(scp
);
399 u32 port_sel
= scp
->device
->channel
+ 1;
401 struct scatterlist
*sg
;
407 dev_dbg_ratelimited(dev
, "%s: (scp=%p) %d/%d/%d/%llu "
408 "cdb=(%08X-%08X-%08X-%08X)\n",
409 __func__
, scp
, host
->host_no
, scp
->device
->channel
,
410 scp
->device
->id
, scp
->device
->lun
,
411 get_unaligned_be32(&((u32
*)scp
->cmnd
)[0]),
412 get_unaligned_be32(&((u32
*)scp
->cmnd
)[1]),
413 get_unaligned_be32(&((u32
*)scp
->cmnd
)[2]),
414 get_unaligned_be32(&((u32
*)scp
->cmnd
)[3]));
417 * If a Task Management Function is active, wait for it to complete
418 * before continuing with regular commands.
420 spin_lock_irqsave(&cfg
->tmf_slock
, lock_flags
);
421 if (cfg
->tmf_active
) {
422 spin_unlock_irqrestore(&cfg
->tmf_slock
, lock_flags
);
423 rc
= SCSI_MLQUEUE_HOST_BUSY
;
426 spin_unlock_irqrestore(&cfg
->tmf_slock
, lock_flags
);
428 switch (cfg
->state
) {
430 dev_dbg_ratelimited(dev
, "%s: device is in reset!\n", __func__
);
431 rc
= SCSI_MLQUEUE_HOST_BUSY
;
434 dev_dbg_ratelimited(dev
, "%s: device has failed!\n", __func__
);
435 scp
->result
= (DID_NO_CONNECT
<< 16);
443 kref_get(&cfg
->afu
->mapcount
);
446 cmd
->rcb
.ctx_id
= afu
->ctx_hndl
;
447 cmd
->rcb
.msi
= SISL_MSI_RRQ_UPDATED
;
448 cmd
->rcb
.port_sel
= port_sel
;
449 cmd
->rcb
.lun_id
= lun_to_lunid(scp
->device
->lun
);
451 if (scp
->sc_data_direction
== DMA_TO_DEVICE
)
452 lflag
= SISL_REQ_FLAGS_HOST_WRITE
;
454 lflag
= SISL_REQ_FLAGS_HOST_READ
;
456 cmd
->rcb
.req_flags
= (SISL_REQ_FLAGS_PORT_LUN_ID
|
457 SISL_REQ_FLAGS_SUP_UNDERRUN
| lflag
);
459 /* Stash the scp in the reserved field, for reuse during interrupt */
463 nseg
= scsi_dma_map(scp
);
464 if (unlikely(nseg
< 0)) {
465 dev_err(dev
, "%s: Fail DMA map! nseg=%d\n",
467 rc
= SCSI_MLQUEUE_HOST_BUSY
;
471 ncount
= scsi_sg_count(scp
);
472 scsi_for_each_sg(scp
, sg
, ncount
, i
) {
473 cmd
->rcb
.data_len
= sg_dma_len(sg
);
474 cmd
->rcb
.data_ea
= sg_dma_address(sg
);
477 /* Copy the CDB from the scsi_cmnd passed in */
478 memcpy(cmd
->rcb
.cdb
, scp
->cmnd
, sizeof(cmd
->rcb
.cdb
));
480 /* Send the command */
481 rc
= send_cmd(afu
, cmd
);
487 kref_put(&afu
->mapcount
, afu_unmap
);
488 pr_devel("%s: returning rc=%d\n", __func__
, rc
);
493 * cxlflash_wait_for_pci_err_recovery() - wait for error recovery during probe
494 * @cfg: Internal structure associated with the host.
496 static void cxlflash_wait_for_pci_err_recovery(struct cxlflash_cfg
*cfg
)
498 struct pci_dev
*pdev
= cfg
->dev
;
500 if (pci_channel_offline(pdev
))
501 wait_event_timeout(cfg
->reset_waitq
,
502 !pci_channel_offline(pdev
),
503 CXLFLASH_PCI_ERROR_RECOVERY_TIMEOUT
);
507 * free_mem() - free memory associated with the AFU
508 * @cfg: Internal structure associated with the host.
510 static void free_mem(struct cxlflash_cfg
*cfg
)
512 struct afu
*afu
= cfg
->afu
;
515 free_pages((ulong
)afu
, get_order(sizeof(struct afu
)));
521 * stop_afu() - stops the AFU command timers and unmaps the MMIO space
522 * @cfg: Internal structure associated with the host.
524 * Safe to call with AFU in a partially allocated/initialized state.
526 * Waits for any active internal AFU commands to timeout and then unmaps
529 static void stop_afu(struct cxlflash_cfg
*cfg
)
531 struct afu
*afu
= cfg
->afu
;
534 while (atomic_read(&afu
->cmds_active
))
536 if (likely(afu
->afu_map
)) {
537 cxl_psa_unmap((void __iomem
*)afu
->afu_map
);
540 kref_put(&afu
->mapcount
, afu_unmap
);
545 * term_intr() - disables all AFU interrupts
546 * @cfg: Internal structure associated with the host.
547 * @level: Depth of allocation, where to begin waterfall tear down.
549 * Safe to call with AFU/MC in partially allocated/initialized state.
551 static void term_intr(struct cxlflash_cfg
*cfg
, enum undo_level level
)
553 struct afu
*afu
= cfg
->afu
;
554 struct device
*dev
= &cfg
->dev
->dev
;
556 if (!afu
|| !cfg
->mcctx
) {
557 dev_err(dev
, "%s: returning with NULL afu or MC\n", __func__
);
563 cxl_unmap_afu_irq(cfg
->mcctx
, 3, afu
);
565 cxl_unmap_afu_irq(cfg
->mcctx
, 2, afu
);
567 cxl_unmap_afu_irq(cfg
->mcctx
, 1, afu
);
569 cxl_free_afu_irqs(cfg
->mcctx
);
572 /* No action required */
578 * term_mc() - terminates the master context
579 * @cfg: Internal structure associated with the host.
580 * @level: Depth of allocation, where to begin waterfall tear down.
582 * Safe to call with AFU/MC in partially allocated/initialized state.
584 static void term_mc(struct cxlflash_cfg
*cfg
)
587 struct afu
*afu
= cfg
->afu
;
588 struct device
*dev
= &cfg
->dev
->dev
;
590 if (!afu
|| !cfg
->mcctx
) {
591 dev_err(dev
, "%s: returning with NULL afu or MC\n", __func__
);
595 rc
= cxl_stop_context(cfg
->mcctx
);
601 * term_afu() - terminates the AFU
602 * @cfg: Internal structure associated with the host.
604 * Safe to call with AFU/MC in partially allocated/initialized state.
606 static void term_afu(struct cxlflash_cfg
*cfg
)
609 * Tear down is carefully orchestrated to ensure
610 * no interrupts can come in when the problem state
613 * 1) Disable all AFU interrupts
614 * 2) Unmap the problem state area
615 * 3) Stop the master context
617 term_intr(cfg
, UNMAP_THREE
);
623 pr_debug("%s: returning\n", __func__
);
627 * notify_shutdown() - notifies device of pending shutdown
628 * @cfg: Internal structure associated with the host.
629 * @wait: Whether to wait for shutdown processing to complete.
631 * This function will notify the AFU that the adapter is being shutdown
632 * and will wait for shutdown processing to complete if wait is true.
633 * This notification should flush pending I/Os to the device and halt
634 * further I/Os until the next AFU reset is issued and device restarted.
636 static void notify_shutdown(struct cxlflash_cfg
*cfg
, bool wait
)
638 struct afu
*afu
= cfg
->afu
;
639 struct device
*dev
= &cfg
->dev
->dev
;
640 struct sisl_global_map __iomem
*global
;
641 struct dev_dependent_vals
*ddv
;
643 int i
, retry_cnt
= 0;
645 ddv
= (struct dev_dependent_vals
*)cfg
->dev_id
->driver_data
;
646 if (!(ddv
->flags
& CXLFLASH_NOTIFY_SHUTDOWN
))
649 if (!afu
|| !afu
->afu_map
) {
650 dev_dbg(dev
, "%s: The problem state area is not mapped\n",
655 global
= &afu
->afu_map
->global
;
658 for (i
= 0; i
< NUM_FC_PORTS
; i
++) {
659 reg
= readq_be(&global
->fc_regs
[i
][FC_CONFIG2
/ 8]);
660 reg
|= SISL_FC_SHUTDOWN_NORMAL
;
661 writeq_be(reg
, &global
->fc_regs
[i
][FC_CONFIG2
/ 8]);
667 /* Wait up to 1.5 seconds for shutdown processing to complete */
668 for (i
= 0; i
< NUM_FC_PORTS
; i
++) {
671 status
= readq_be(&global
->fc_regs
[i
][FC_STATUS
/ 8]);
672 if (status
& SISL_STATUS_SHUTDOWN_COMPLETE
)
674 if (++retry_cnt
>= MC_RETRY_CNT
) {
675 dev_dbg(dev
, "%s: port %d shutdown processing "
676 "not yet completed\n", __func__
, i
);
679 msleep(100 * retry_cnt
);
685 * cxlflash_remove() - PCI entry point to tear down host
686 * @pdev: PCI device associated with the host.
688 * Safe to use as a cleanup in partially allocated/initialized state.
690 static void cxlflash_remove(struct pci_dev
*pdev
)
692 struct cxlflash_cfg
*cfg
= pci_get_drvdata(pdev
);
695 if (!pci_is_enabled(pdev
)) {
696 pr_debug("%s: Device is disabled\n", __func__
);
700 /* If a Task Management Function is active, wait for it to complete
701 * before continuing with remove.
703 spin_lock_irqsave(&cfg
->tmf_slock
, lock_flags
);
705 wait_event_interruptible_lock_irq(cfg
->tmf_waitq
,
708 spin_unlock_irqrestore(&cfg
->tmf_slock
, lock_flags
);
710 /* Notify AFU and wait for shutdown processing to complete */
711 notify_shutdown(cfg
, true);
713 cfg
->state
= STATE_FAILTERM
;
714 cxlflash_stop_term_user_contexts(cfg
);
716 switch (cfg
->init_state
) {
717 case INIT_STATE_SCSI
:
718 cxlflash_term_local_luns(cfg
);
719 scsi_remove_host(cfg
->host
);
722 cancel_work_sync(&cfg
->work_q
);
725 pci_disable_device(pdev
);
726 case INIT_STATE_NONE
:
728 scsi_host_put(cfg
->host
);
732 pr_debug("%s: returning\n", __func__
);
736 * alloc_mem() - allocates the AFU and its command pool
737 * @cfg: Internal structure associated with the host.
739 * A partially allocated state remains on failure.
743 * -ENOMEM on failure to allocate memory
745 static int alloc_mem(struct cxlflash_cfg
*cfg
)
748 struct device
*dev
= &cfg
->dev
->dev
;
750 /* AFU is ~12k, i.e. only one 64k page or up to four 4k pages */
751 cfg
->afu
= (void *)__get_free_pages(GFP_KERNEL
| __GFP_ZERO
,
752 get_order(sizeof(struct afu
)));
753 if (unlikely(!cfg
->afu
)) {
754 dev_err(dev
, "%s: cannot get %d free pages\n",
755 __func__
, get_order(sizeof(struct afu
)));
759 cfg
->afu
->parent
= cfg
;
760 cfg
->afu
->afu_map
= NULL
;
766 * init_pci() - initializes the host as a PCI device
767 * @cfg: Internal structure associated with the host.
769 * Return: 0 on success, -errno on failure
771 static int init_pci(struct cxlflash_cfg
*cfg
)
773 struct pci_dev
*pdev
= cfg
->dev
;
776 rc
= pci_enable_device(pdev
);
777 if (rc
|| pci_channel_offline(pdev
)) {
778 if (pci_channel_offline(pdev
)) {
779 cxlflash_wait_for_pci_err_recovery(cfg
);
780 rc
= pci_enable_device(pdev
);
784 dev_err(&pdev
->dev
, "%s: Cannot enable adapter\n",
786 cxlflash_wait_for_pci_err_recovery(cfg
);
792 pr_debug("%s: returning rc=%d\n", __func__
, rc
);
797 * init_scsi() - adds the host to the SCSI stack and kicks off host scan
798 * @cfg: Internal structure associated with the host.
800 * Return: 0 on success, -errno on failure
802 static int init_scsi(struct cxlflash_cfg
*cfg
)
804 struct pci_dev
*pdev
= cfg
->dev
;
807 rc
= scsi_add_host(cfg
->host
, &pdev
->dev
);
809 dev_err(&pdev
->dev
, "%s: scsi_add_host failed (rc=%d)\n",
814 scsi_scan_host(cfg
->host
);
817 pr_debug("%s: returning rc=%d\n", __func__
, rc
);
822 * set_port_online() - transitions the specified host FC port to online state
823 * @fc_regs: Top of MMIO region defined for specified port.
825 * The provided MMIO region must be mapped prior to call. Online state means
826 * that the FC link layer has synced, completed the handshaking process, and
827 * is ready for login to start.
829 static void set_port_online(__be64 __iomem
*fc_regs
)
833 cmdcfg
= readq_be(&fc_regs
[FC_MTIP_CMDCONFIG
/ 8]);
834 cmdcfg
&= (~FC_MTIP_CMDCONFIG_OFFLINE
); /* clear OFF_LINE */
835 cmdcfg
|= (FC_MTIP_CMDCONFIG_ONLINE
); /* set ON_LINE */
836 writeq_be(cmdcfg
, &fc_regs
[FC_MTIP_CMDCONFIG
/ 8]);
840 * set_port_offline() - transitions the specified host FC port to offline state
841 * @fc_regs: Top of MMIO region defined for specified port.
843 * The provided MMIO region must be mapped prior to call.
845 static void set_port_offline(__be64 __iomem
*fc_regs
)
849 cmdcfg
= readq_be(&fc_regs
[FC_MTIP_CMDCONFIG
/ 8]);
850 cmdcfg
&= (~FC_MTIP_CMDCONFIG_ONLINE
); /* clear ON_LINE */
851 cmdcfg
|= (FC_MTIP_CMDCONFIG_OFFLINE
); /* set OFF_LINE */
852 writeq_be(cmdcfg
, &fc_regs
[FC_MTIP_CMDCONFIG
/ 8]);
856 * wait_port_online() - waits for the specified host FC port come online
857 * @fc_regs: Top of MMIO region defined for specified port.
858 * @delay_us: Number of microseconds to delay between reading port status.
859 * @nretry: Number of cycles to retry reading port status.
861 * The provided MMIO region must be mapped prior to call. This will timeout
862 * when the cable is not plugged in.
865 * TRUE (1) when the specified port is online
866 * FALSE (0) when the specified port fails to come online after timeout
867 * -EINVAL when @delay_us is less than 1000
869 static int wait_port_online(__be64 __iomem
*fc_regs
, u32 delay_us
, u32 nretry
)
873 if (delay_us
< 1000) {
874 pr_err("%s: invalid delay specified %d\n", __func__
, delay_us
);
879 msleep(delay_us
/ 1000);
880 status
= readq_be(&fc_regs
[FC_MTIP_STATUS
/ 8]);
881 if (status
== U64_MAX
)
883 } while ((status
& FC_MTIP_STATUS_MASK
) != FC_MTIP_STATUS_ONLINE
&&
886 return ((status
& FC_MTIP_STATUS_MASK
) == FC_MTIP_STATUS_ONLINE
);
890 * wait_port_offline() - waits for the specified host FC port go offline
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.
898 * TRUE (1) when the specified port is offline
899 * FALSE (0) when the specified port fails to go offline after timeout
900 * -EINVAL when @delay_us is less than 1000
902 static int wait_port_offline(__be64 __iomem
*fc_regs
, u32 delay_us
, u32 nretry
)
906 if (delay_us
< 1000) {
907 pr_err("%s: invalid delay specified %d\n", __func__
, delay_us
);
912 msleep(delay_us
/ 1000);
913 status
= readq_be(&fc_regs
[FC_MTIP_STATUS
/ 8]);
914 if (status
== U64_MAX
)
916 } while ((status
& FC_MTIP_STATUS_MASK
) != FC_MTIP_STATUS_OFFLINE
&&
919 return ((status
& FC_MTIP_STATUS_MASK
) == FC_MTIP_STATUS_OFFLINE
);
923 * afu_set_wwpn() - configures the WWPN for the specified host FC port
924 * @afu: AFU associated with the host that owns the specified FC port.
925 * @port: Port number being configured.
926 * @fc_regs: Top of MMIO region defined for specified port.
927 * @wwpn: The world-wide-port-number previously discovered for port.
929 * The provided MMIO region must be mapped prior to call. As part of the
930 * sequence to configure the WWPN, the port is toggled offline and then back
931 * online. This toggling action can cause this routine to delay up to a few
932 * seconds. When configured to use the internal LUN feature of the AFU, a
933 * failure to come online is overridden.
935 static void afu_set_wwpn(struct afu
*afu
, int port
, __be64 __iomem
*fc_regs
,
938 set_port_offline(fc_regs
);
939 if (!wait_port_offline(fc_regs
, FC_PORT_STATUS_RETRY_INTERVAL_US
,
940 FC_PORT_STATUS_RETRY_CNT
)) {
941 pr_debug("%s: wait on port %d to go offline timed out\n",
945 writeq_be(wwpn
, &fc_regs
[FC_PNAME
/ 8]);
947 set_port_online(fc_regs
);
948 if (!wait_port_online(fc_regs
, FC_PORT_STATUS_RETRY_INTERVAL_US
,
949 FC_PORT_STATUS_RETRY_CNT
)) {
950 pr_debug("%s: wait on port %d to go online timed out\n",
956 * afu_link_reset() - resets the specified host FC port
957 * @afu: AFU associated with the host that owns the specified FC port.
958 * @port: Port number being configured.
959 * @fc_regs: Top of MMIO region defined for specified port.
961 * The provided MMIO region must be mapped prior to call. The sequence to
962 * reset the port involves toggling it offline and then back online. This
963 * action can cause this routine to delay up to a few seconds. An effort
964 * is made to maintain link with the device by switching to host to use
965 * the alternate port exclusively while the reset takes place.
966 * failure to come online is overridden.
968 static void afu_link_reset(struct afu
*afu
, int port
, __be64 __iomem
*fc_regs
)
972 /* first switch the AFU to the other links, if any */
973 port_sel
= readq_be(&afu
->afu_map
->global
.regs
.afu_port_sel
);
974 port_sel
&= ~(1ULL << port
);
975 writeq_be(port_sel
, &afu
->afu_map
->global
.regs
.afu_port_sel
);
976 cxlflash_afu_sync(afu
, 0, 0, AFU_GSYNC
);
978 set_port_offline(fc_regs
);
979 if (!wait_port_offline(fc_regs
, FC_PORT_STATUS_RETRY_INTERVAL_US
,
980 FC_PORT_STATUS_RETRY_CNT
))
981 pr_err("%s: wait on port %d to go offline timed out\n",
984 set_port_online(fc_regs
);
985 if (!wait_port_online(fc_regs
, FC_PORT_STATUS_RETRY_INTERVAL_US
,
986 FC_PORT_STATUS_RETRY_CNT
))
987 pr_err("%s: wait on port %d to go online timed out\n",
990 /* switch back to include this port */
991 port_sel
|= (1ULL << port
);
992 writeq_be(port_sel
, &afu
->afu_map
->global
.regs
.afu_port_sel
);
993 cxlflash_afu_sync(afu
, 0, 0, AFU_GSYNC
);
995 pr_debug("%s: returning port_sel=%lld\n", __func__
, port_sel
);
999 * Asynchronous interrupt information table
1001 static const struct asyc_intr_info ainfo
[] = {
1002 {SISL_ASTATUS_FC0_OTHER
, "other error", 0, CLR_FC_ERROR
| LINK_RESET
},
1003 {SISL_ASTATUS_FC0_LOGO
, "target initiated LOGO", 0, 0},
1004 {SISL_ASTATUS_FC0_CRC_T
, "CRC threshold exceeded", 0, LINK_RESET
},
1005 {SISL_ASTATUS_FC0_LOGI_R
, "login timed out, retrying", 0, LINK_RESET
},
1006 {SISL_ASTATUS_FC0_LOGI_F
, "login failed", 0, CLR_FC_ERROR
},
1007 {SISL_ASTATUS_FC0_LOGI_S
, "login succeeded", 0, SCAN_HOST
},
1008 {SISL_ASTATUS_FC0_LINK_DN
, "link down", 0, 0},
1009 {SISL_ASTATUS_FC0_LINK_UP
, "link up", 0, 0},
1010 {SISL_ASTATUS_FC1_OTHER
, "other error", 1, CLR_FC_ERROR
| LINK_RESET
},
1011 {SISL_ASTATUS_FC1_LOGO
, "target initiated LOGO", 1, 0},
1012 {SISL_ASTATUS_FC1_CRC_T
, "CRC threshold exceeded", 1, LINK_RESET
},
1013 {SISL_ASTATUS_FC1_LOGI_R
, "login timed out, retrying", 1, LINK_RESET
},
1014 {SISL_ASTATUS_FC1_LOGI_F
, "login failed", 1, CLR_FC_ERROR
},
1015 {SISL_ASTATUS_FC1_LOGI_S
, "login succeeded", 1, SCAN_HOST
},
1016 {SISL_ASTATUS_FC1_LINK_DN
, "link down", 1, 0},
1017 {SISL_ASTATUS_FC1_LINK_UP
, "link up", 1, 0},
1018 {0x0, "", 0, 0} /* terminator */
1022 * find_ainfo() - locates and returns asynchronous interrupt information
1023 * @status: Status code set by AFU on error.
1025 * Return: The located information or NULL when the status code is invalid.
1027 static const struct asyc_intr_info
*find_ainfo(u64 status
)
1029 const struct asyc_intr_info
*info
;
1031 for (info
= &ainfo
[0]; info
->status
; info
++)
1032 if (info
->status
== status
)
1039 * afu_err_intr_init() - clears and initializes the AFU for error interrupts
1040 * @afu: AFU associated with the host.
1042 static void afu_err_intr_init(struct afu
*afu
)
1047 /* global async interrupts: AFU clears afu_ctrl on context exit
1048 * if async interrupts were sent to that context. This prevents
1049 * the AFU form sending further async interrupts when
1051 * nobody to receive them.
1055 writeq_be(-1ULL, &afu
->afu_map
->global
.regs
.aintr_mask
);
1056 /* set LISN# to send and point to master context */
1057 reg
= ((u64
) (((afu
->ctx_hndl
<< 8) | SISL_MSI_ASYNC_ERROR
)) << 40);
1059 if (afu
->internal_lun
)
1060 reg
|= 1; /* Bit 63 indicates local lun */
1061 writeq_be(reg
, &afu
->afu_map
->global
.regs
.afu_ctrl
);
1063 writeq_be(-1ULL, &afu
->afu_map
->global
.regs
.aintr_clear
);
1064 /* unmask bits that are of interest */
1065 /* note: afu can send an interrupt after this step */
1066 writeq_be(SISL_ASTATUS_MASK
, &afu
->afu_map
->global
.regs
.aintr_mask
);
1067 /* clear again in case a bit came on after previous clear but before */
1069 writeq_be(-1ULL, &afu
->afu_map
->global
.regs
.aintr_clear
);
1071 /* Clear/Set internal lun bits */
1072 reg
= readq_be(&afu
->afu_map
->global
.fc_regs
[0][FC_CONFIG2
/ 8]);
1073 reg
&= SISL_FC_INTERNAL_MASK
;
1074 if (afu
->internal_lun
)
1075 reg
|= ((u64
)(afu
->internal_lun
- 1) << SISL_FC_INTERNAL_SHIFT
);
1076 writeq_be(reg
, &afu
->afu_map
->global
.fc_regs
[0][FC_CONFIG2
/ 8]);
1078 /* now clear FC errors */
1079 for (i
= 0; i
< NUM_FC_PORTS
; i
++) {
1080 writeq_be(0xFFFFFFFFU
,
1081 &afu
->afu_map
->global
.fc_regs
[i
][FC_ERROR
/ 8]);
1082 writeq_be(0, &afu
->afu_map
->global
.fc_regs
[i
][FC_ERRCAP
/ 8]);
1085 /* sync interrupts for master's IOARRIN write */
1086 /* note that unlike asyncs, there can be no pending sync interrupts */
1087 /* at this time (this is a fresh context and master has not written */
1088 /* IOARRIN yet), so there is nothing to clear. */
1090 /* set LISN#, it is always sent to the context that wrote IOARRIN */
1091 writeq_be(SISL_MSI_SYNC_ERROR
, &afu
->host_map
->ctx_ctrl
);
1092 writeq_be(SISL_ISTATUS_MASK
, &afu
->host_map
->intr_mask
);
1096 * cxlflash_sync_err_irq() - interrupt handler for synchronous errors
1097 * @irq: Interrupt number.
1098 * @data: Private data provided at interrupt registration, the AFU.
1100 * Return: Always return IRQ_HANDLED.
1102 static irqreturn_t
cxlflash_sync_err_irq(int irq
, void *data
)
1104 struct afu
*afu
= (struct afu
*)data
;
1108 reg
= readq_be(&afu
->host_map
->intr_status
);
1109 reg_unmasked
= (reg
& SISL_ISTATUS_UNMASK
);
1111 if (reg_unmasked
== 0UL) {
1112 pr_err("%s: %llX: spurious interrupt, intr_status %016llX\n",
1113 __func__
, (u64
)afu
, reg
);
1114 goto cxlflash_sync_err_irq_exit
;
1117 pr_err("%s: %llX: unexpected interrupt, intr_status %016llX\n",
1118 __func__
, (u64
)afu
, reg
);
1120 writeq_be(reg_unmasked
, &afu
->host_map
->intr_clear
);
1122 cxlflash_sync_err_irq_exit
:
1123 pr_debug("%s: returning rc=%d\n", __func__
, IRQ_HANDLED
);
1128 * cxlflash_rrq_irq() - interrupt handler for read-response queue (normal path)
1129 * @irq: Interrupt number.
1130 * @data: Private data provided at interrupt registration, the AFU.
1132 * Return: Always return IRQ_HANDLED.
1134 static irqreturn_t
cxlflash_rrq_irq(int irq
, void *data
)
1136 struct afu
*afu
= (struct afu
*)data
;
1137 struct afu_cmd
*cmd
;
1138 bool toggle
= afu
->toggle
;
1140 *hrrq_start
= afu
->hrrq_start
,
1141 *hrrq_end
= afu
->hrrq_end
,
1142 *hrrq_curr
= afu
->hrrq_curr
;
1144 /* Process however many RRQ entries that are ready */
1148 if ((entry
& SISL_RESP_HANDLE_T_BIT
) != toggle
)
1151 cmd
= (struct afu_cmd
*)(entry
& ~SISL_RESP_HANDLE_T_BIT
);
1154 /* Advance to next entry or wrap and flip the toggle bit */
1155 if (hrrq_curr
< hrrq_end
)
1158 hrrq_curr
= hrrq_start
;
1159 toggle
^= SISL_RESP_HANDLE_T_BIT
;
1163 afu
->hrrq_curr
= hrrq_curr
;
1164 afu
->toggle
= toggle
;
1170 * cxlflash_async_err_irq() - interrupt handler for asynchronous errors
1171 * @irq: Interrupt number.
1172 * @data: Private data provided at interrupt registration, the AFU.
1174 * Return: Always return IRQ_HANDLED.
1176 static irqreturn_t
cxlflash_async_err_irq(int irq
, void *data
)
1178 struct afu
*afu
= (struct afu
*)data
;
1179 struct cxlflash_cfg
*cfg
= afu
->parent
;
1180 struct device
*dev
= &cfg
->dev
->dev
;
1182 const struct asyc_intr_info
*info
;
1183 struct sisl_global_map __iomem
*global
= &afu
->afu_map
->global
;
1188 reg
= readq_be(&global
->regs
.aintr_status
);
1189 reg_unmasked
= (reg
& SISL_ASTATUS_UNMASK
);
1191 if (reg_unmasked
== 0) {
1192 dev_err(dev
, "%s: spurious interrupt, aintr_status 0x%016llX\n",
1197 /* FYI, it is 'okay' to clear AFU status before FC_ERROR */
1198 writeq_be(reg_unmasked
, &global
->regs
.aintr_clear
);
1200 /* Check each bit that is on */
1201 for (i
= 0; reg_unmasked
; i
++, reg_unmasked
= (reg_unmasked
>> 1)) {
1202 info
= find_ainfo(1ULL << i
);
1203 if (((reg_unmasked
& 0x1) == 0) || !info
)
1208 dev_err(dev
, "%s: FC Port %d -> %s, fc_status 0x%08llX\n",
1209 __func__
, port
, info
->desc
,
1210 readq_be(&global
->fc_regs
[port
][FC_STATUS
/ 8]));
1213 * Do link reset first, some OTHER errors will set FC_ERROR
1214 * again if cleared before or w/o a reset
1216 if (info
->action
& LINK_RESET
) {
1217 dev_err(dev
, "%s: FC Port %d: resetting link\n",
1219 cfg
->lr_state
= LINK_RESET_REQUIRED
;
1220 cfg
->lr_port
= port
;
1221 kref_get(&cfg
->afu
->mapcount
);
1222 schedule_work(&cfg
->work_q
);
1225 if (info
->action
& CLR_FC_ERROR
) {
1226 reg
= readq_be(&global
->fc_regs
[port
][FC_ERROR
/ 8]);
1229 * Since all errors are unmasked, FC_ERROR and FC_ERRCAP
1230 * should be the same and tracing one is sufficient.
1233 dev_err(dev
, "%s: fc %d: clearing fc_error 0x%08llX\n",
1234 __func__
, port
, reg
);
1236 writeq_be(reg
, &global
->fc_regs
[port
][FC_ERROR
/ 8]);
1237 writeq_be(0, &global
->fc_regs
[port
][FC_ERRCAP
/ 8]);
1240 if (info
->action
& SCAN_HOST
) {
1241 atomic_inc(&cfg
->scan_host_needed
);
1242 kref_get(&cfg
->afu
->mapcount
);
1243 schedule_work(&cfg
->work_q
);
1248 dev_dbg(dev
, "%s: returning IRQ_HANDLED, afu=%p\n", __func__
, afu
);
1253 * start_context() - starts the master context
1254 * @cfg: Internal structure associated with the host.
1256 * Return: A success or failure value from CXL services.
1258 static int start_context(struct cxlflash_cfg
*cfg
)
1262 rc
= cxl_start_context(cfg
->mcctx
,
1263 cfg
->afu
->work
.work_element_descriptor
,
1266 pr_debug("%s: returning rc=%d\n", __func__
, rc
);
1271 * read_vpd() - obtains the WWPNs from VPD
1272 * @cfg: Internal structure associated with the host.
1273 * @wwpn: Array of size NUM_FC_PORTS to pass back WWPNs
1275 * Return: 0 on success, -errno on failure
1277 static int read_vpd(struct cxlflash_cfg
*cfg
, u64 wwpn
[])
1279 struct pci_dev
*dev
= cfg
->dev
;
1281 int ro_start
, ro_size
, i
, j
, k
;
1283 char vpd_data
[CXLFLASH_VPD_LEN
];
1284 char tmp_buf
[WWPN_BUF_LEN
] = { 0 };
1285 char *wwpn_vpd_tags
[NUM_FC_PORTS
] = { "V5", "V6" };
1287 /* Get the VPD data from the device */
1288 vpd_size
= cxl_read_adapter_vpd(dev
, vpd_data
, sizeof(vpd_data
));
1289 if (unlikely(vpd_size
<= 0)) {
1290 dev_err(&dev
->dev
, "%s: Unable to read VPD (size = %ld)\n",
1291 __func__
, vpd_size
);
1296 /* Get the read only section offset */
1297 ro_start
= pci_vpd_find_tag(vpd_data
, 0, vpd_size
,
1298 PCI_VPD_LRDT_RO_DATA
);
1299 if (unlikely(ro_start
< 0)) {
1300 dev_err(&dev
->dev
, "%s: VPD Read-only data not found\n",
1306 /* Get the read only section size, cap when extends beyond read VPD */
1307 ro_size
= pci_vpd_lrdt_size(&vpd_data
[ro_start
]);
1309 i
= ro_start
+ PCI_VPD_LRDT_TAG_SIZE
;
1310 if (unlikely((i
+ j
) > vpd_size
)) {
1311 pr_debug("%s: Might need to read more VPD (%d > %ld)\n",
1312 __func__
, (i
+ j
), vpd_size
);
1313 ro_size
= vpd_size
- i
;
1317 * Find the offset of the WWPN tag within the read only
1318 * VPD data and validate the found field (partials are
1319 * no good to us). Convert the ASCII data to an integer
1320 * value. Note that we must copy to a temporary buffer
1321 * because the conversion service requires that the ASCII
1322 * string be terminated.
1324 for (k
= 0; k
< NUM_FC_PORTS
; k
++) {
1326 i
= ro_start
+ PCI_VPD_LRDT_TAG_SIZE
;
1328 i
= pci_vpd_find_info_keyword(vpd_data
, i
, j
, wwpn_vpd_tags
[k
]);
1329 if (unlikely(i
< 0)) {
1330 dev_err(&dev
->dev
, "%s: Port %d WWPN not found "
1331 "in VPD\n", __func__
, k
);
1336 j
= pci_vpd_info_field_size(&vpd_data
[i
]);
1337 i
+= PCI_VPD_INFO_FLD_HDR_SIZE
;
1338 if (unlikely((i
+ j
> vpd_size
) || (j
!= WWPN_LEN
))) {
1339 dev_err(&dev
->dev
, "%s: Port %d WWPN incomplete or "
1346 memcpy(tmp_buf
, &vpd_data
[i
], WWPN_LEN
);
1347 rc
= kstrtoul(tmp_buf
, WWPN_LEN
, (ulong
*)&wwpn
[k
]);
1349 dev_err(&dev
->dev
, "%s: Fail to convert port %d WWPN "
1350 "to integer\n", __func__
, k
);
1357 pr_debug("%s: returning rc=%d\n", __func__
, rc
);
1362 * init_pcr() - initialize the provisioning and control registers
1363 * @cfg: Internal structure associated with the host.
1365 * Also sets up fast access to the mapped registers and initializes AFU
1366 * command fields that never change.
1368 static void init_pcr(struct cxlflash_cfg
*cfg
)
1370 struct afu
*afu
= cfg
->afu
;
1371 struct sisl_ctrl_map __iomem
*ctrl_map
;
1374 for (i
= 0; i
< MAX_CONTEXT
; i
++) {
1375 ctrl_map
= &afu
->afu_map
->ctrls
[i
].ctrl
;
1376 /* Disrupt any clients that could be running */
1377 /* e.g. clients that survived a master restart */
1378 writeq_be(0, &ctrl_map
->rht_start
);
1379 writeq_be(0, &ctrl_map
->rht_cnt_id
);
1380 writeq_be(0, &ctrl_map
->ctx_cap
);
1383 /* Copy frequently used fields into afu */
1384 afu
->ctx_hndl
= (u16
) cxl_process_element(cfg
->mcctx
);
1385 afu
->host_map
= &afu
->afu_map
->hosts
[afu
->ctx_hndl
].host
;
1386 afu
->ctrl_map
= &afu
->afu_map
->ctrls
[afu
->ctx_hndl
].ctrl
;
1388 /* Program the Endian Control for the master context */
1389 writeq_be(SISL_ENDIAN_CTRL
, &afu
->host_map
->endian_ctrl
);
1393 * init_global() - initialize AFU global registers
1394 * @cfg: Internal structure associated with the host.
1396 static int init_global(struct cxlflash_cfg
*cfg
)
1398 struct afu
*afu
= cfg
->afu
;
1399 struct device
*dev
= &cfg
->dev
->dev
;
1400 u64 wwpn
[NUM_FC_PORTS
]; /* wwpn of AFU ports */
1401 int i
= 0, num_ports
= 0;
1405 rc
= read_vpd(cfg
, &wwpn
[0]);
1407 dev_err(dev
, "%s: could not read vpd rc=%d\n", __func__
, rc
);
1411 pr_debug("%s: wwpn0=0x%llX wwpn1=0x%llX\n", __func__
, wwpn
[0], wwpn
[1]);
1413 /* Set up RRQ in AFU for master issued cmds */
1414 writeq_be((u64
) afu
->hrrq_start
, &afu
->host_map
->rrq_start
);
1415 writeq_be((u64
) afu
->hrrq_end
, &afu
->host_map
->rrq_end
);
1417 /* AFU configuration */
1418 reg
= readq_be(&afu
->afu_map
->global
.regs
.afu_config
);
1419 reg
|= SISL_AFUCONF_AR_ALL
|SISL_AFUCONF_ENDIAN
;
1420 /* enable all auto retry options and control endianness */
1421 /* leave others at default: */
1422 /* CTX_CAP write protected, mbox_r does not clear on read and */
1423 /* checker on if dual afu */
1424 writeq_be(reg
, &afu
->afu_map
->global
.regs
.afu_config
);
1426 /* Global port select: select either port */
1427 if (afu
->internal_lun
) {
1428 /* Only use port 0 */
1429 writeq_be(PORT0
, &afu
->afu_map
->global
.regs
.afu_port_sel
);
1430 num_ports
= NUM_FC_PORTS
- 1;
1432 writeq_be(BOTH_PORTS
, &afu
->afu_map
->global
.regs
.afu_port_sel
);
1433 num_ports
= NUM_FC_PORTS
;
1436 for (i
= 0; i
< num_ports
; i
++) {
1437 /* Unmask all errors (but they are still masked at AFU) */
1438 writeq_be(0, &afu
->afu_map
->global
.fc_regs
[i
][FC_ERRMSK
/ 8]);
1439 /* Clear CRC error cnt & set a threshold */
1440 (void)readq_be(&afu
->afu_map
->global
.
1441 fc_regs
[i
][FC_CNT_CRCERR
/ 8]);
1442 writeq_be(MC_CRC_THRESH
, &afu
->afu_map
->global
.fc_regs
[i
]
1443 [FC_CRC_THRESH
/ 8]);
1445 /* Set WWPNs. If already programmed, wwpn[i] is 0 */
1447 afu_set_wwpn(afu
, i
,
1448 &afu
->afu_map
->global
.fc_regs
[i
][0],
1450 /* Programming WWPN back to back causes additional
1451 * offline/online transitions and a PLOGI
1456 /* Set up master's own CTX_CAP to allow real mode, host translation */
1457 /* tables, afu cmds and read/write GSCSI cmds. */
1458 /* First, unlock ctx_cap write by reading mbox */
1459 (void)readq_be(&afu
->ctrl_map
->mbox_r
); /* unlock ctx_cap */
1460 writeq_be((SISL_CTX_CAP_REAL_MODE
| SISL_CTX_CAP_HOST_XLATE
|
1461 SISL_CTX_CAP_READ_CMD
| SISL_CTX_CAP_WRITE_CMD
|
1462 SISL_CTX_CAP_AFU_CMD
| SISL_CTX_CAP_GSCSI_CMD
),
1463 &afu
->ctrl_map
->ctx_cap
);
1464 /* Initialize heartbeat */
1465 afu
->hb
= readq_be(&afu
->afu_map
->global
.regs
.afu_hb
);
1472 * start_afu() - initializes and starts the AFU
1473 * @cfg: Internal structure associated with the host.
1475 static int start_afu(struct cxlflash_cfg
*cfg
)
1477 struct afu
*afu
= cfg
->afu
;
1482 /* After an AFU reset, RRQ entries are stale, clear them */
1483 memset(&afu
->rrq_entry
, 0, sizeof(afu
->rrq_entry
));
1485 /* Initialize RRQ pointers */
1486 afu
->hrrq_start
= &afu
->rrq_entry
[0];
1487 afu
->hrrq_end
= &afu
->rrq_entry
[NUM_RRQ_ENTRY
- 1];
1488 afu
->hrrq_curr
= afu
->hrrq_start
;
1491 rc
= init_global(cfg
);
1493 pr_debug("%s: returning rc=%d\n", __func__
, rc
);
1498 * init_intr() - setup interrupt handlers for the master context
1499 * @cfg: Internal structure associated with the host.
1501 * Return: 0 on success, -errno on failure
1503 static enum undo_level
init_intr(struct cxlflash_cfg
*cfg
,
1504 struct cxl_context
*ctx
)
1506 struct afu
*afu
= cfg
->afu
;
1507 struct device
*dev
= &cfg
->dev
->dev
;
1509 enum undo_level level
= UNDO_NOOP
;
1511 rc
= cxl_allocate_afu_irqs(ctx
, 3);
1513 dev_err(dev
, "%s: call to allocate_afu_irqs failed rc=%d!\n",
1519 rc
= cxl_map_afu_irq(ctx
, 1, cxlflash_sync_err_irq
, afu
,
1520 "SISL_MSI_SYNC_ERROR");
1521 if (unlikely(rc
<= 0)) {
1522 dev_err(dev
, "%s: IRQ 1 (SISL_MSI_SYNC_ERROR) map failed!\n",
1528 rc
= cxl_map_afu_irq(ctx
, 2, cxlflash_rrq_irq
, afu
,
1529 "SISL_MSI_RRQ_UPDATED");
1530 if (unlikely(rc
<= 0)) {
1531 dev_err(dev
, "%s: IRQ 2 (SISL_MSI_RRQ_UPDATED) map failed!\n",
1537 rc
= cxl_map_afu_irq(ctx
, 3, cxlflash_async_err_irq
, afu
,
1538 "SISL_MSI_ASYNC_ERROR");
1539 if (unlikely(rc
<= 0)) {
1540 dev_err(dev
, "%s: IRQ 3 (SISL_MSI_ASYNC_ERROR) map failed!\n",
1550 * init_mc() - create and register as the master context
1551 * @cfg: Internal structure associated with the host.
1553 * Return: 0 on success, -errno on failure
1555 static int init_mc(struct cxlflash_cfg
*cfg
)
1557 struct cxl_context
*ctx
;
1558 struct device
*dev
= &cfg
->dev
->dev
;
1560 enum undo_level level
;
1562 ctx
= cxl_get_context(cfg
->dev
);
1563 if (unlikely(!ctx
)) {
1569 /* Set it up as a master with the CXL */
1570 cxl_set_master(ctx
);
1572 /* During initialization reset the AFU to start from a clean slate */
1573 rc
= cxl_afu_reset(cfg
->mcctx
);
1575 dev_err(dev
, "%s: initial AFU reset failed rc=%d\n",
1580 level
= init_intr(cfg
, ctx
);
1581 if (unlikely(level
)) {
1582 dev_err(dev
, "%s: setting up interrupts failed rc=%d\n",
1587 /* This performs the equivalent of the CXL_IOCTL_START_WORK.
1588 * The CXL_IOCTL_GET_PROCESS_ELEMENT is implicit in the process
1589 * element (pe) that is embedded in the context (ctx)
1591 rc
= start_context(cfg
);
1593 dev_err(dev
, "%s: start context failed rc=%d\n", __func__
, rc
);
1594 level
= UNMAP_THREE
;
1598 pr_debug("%s: returning rc=%d\n", __func__
, rc
);
1601 term_intr(cfg
, level
);
1606 * init_afu() - setup as master context and start AFU
1607 * @cfg: Internal structure associated with the host.
1609 * This routine is a higher level of control for configuring the
1610 * AFU on probe and reset paths.
1612 * Return: 0 on success, -errno on failure
1614 static int init_afu(struct cxlflash_cfg
*cfg
)
1618 struct afu
*afu
= cfg
->afu
;
1619 struct device
*dev
= &cfg
->dev
->dev
;
1621 cxl_perst_reloads_same_image(cfg
->cxl_afu
, true);
1625 dev_err(dev
, "%s: call to init_mc failed, rc=%d!\n",
1630 /* Map the entire MMIO space of the AFU */
1631 afu
->afu_map
= cxl_psa_map(cfg
->mcctx
);
1632 if (!afu
->afu_map
) {
1633 dev_err(dev
, "%s: call to cxl_psa_map failed!\n", __func__
);
1637 kref_init(&afu
->mapcount
);
1639 /* No byte reverse on reading afu_version or string will be backwards */
1640 reg
= readq(&afu
->afu_map
->global
.regs
.afu_version
);
1641 memcpy(afu
->version
, ®
, sizeof(reg
));
1642 afu
->interface_version
=
1643 readq_be(&afu
->afu_map
->global
.regs
.interface_version
);
1644 if ((afu
->interface_version
+ 1) == 0) {
1645 pr_err("Back level AFU, please upgrade. AFU version %s "
1646 "interface version 0x%llx\n", afu
->version
,
1647 afu
->interface_version
);
1652 pr_debug("%s: afu version %s, interface version 0x%llX\n", __func__
,
1653 afu
->version
, afu
->interface_version
);
1655 rc
= start_afu(cfg
);
1657 dev_err(dev
, "%s: call to start_afu failed, rc=%d!\n",
1662 afu_err_intr_init(cfg
->afu
);
1663 spin_lock_init(&afu
->rrin_slock
);
1664 afu
->room
= readq_be(&afu
->host_map
->cmd_room
);
1666 /* Restore the LUN mappings */
1667 cxlflash_restore_luntable(cfg
);
1669 pr_debug("%s: returning rc=%d\n", __func__
, rc
);
1673 kref_put(&afu
->mapcount
, afu_unmap
);
1675 term_intr(cfg
, UNMAP_THREE
);
1681 * cxlflash_afu_sync() - builds and sends an AFU sync command
1682 * @afu: AFU associated with the host.
1683 * @ctx_hndl_u: Identifies context requesting sync.
1684 * @res_hndl_u: Identifies resource requesting sync.
1685 * @mode: Type of sync to issue (lightweight, heavyweight, global).
1687 * The AFU can only take 1 sync command at a time. This routine enforces this
1688 * limitation by using a mutex to provide exclusive access to the AFU during
1689 * the sync. This design point requires calling threads to not be on interrupt
1690 * context due to the possibility of sleeping during concurrent sync operations.
1692 * AFU sync operations are only necessary and allowed when the device is
1693 * operating normally. When not operating normally, sync requests can occur as
1694 * part of cleaning up resources associated with an adapter prior to removal.
1695 * In this scenario, these requests are simply ignored (safe due to the AFU
1702 int cxlflash_afu_sync(struct afu
*afu
, ctx_hndl_t ctx_hndl_u
,
1703 res_hndl_t res_hndl_u
, u8 mode
)
1705 struct cxlflash_cfg
*cfg
= afu
->parent
;
1706 struct device
*dev
= &cfg
->dev
->dev
;
1707 struct afu_cmd
*cmd
= NULL
;
1710 static DEFINE_MUTEX(sync_active
);
1712 if (cfg
->state
!= STATE_NORMAL
) {
1713 pr_debug("%s: Sync not required! (%u)\n", __func__
, cfg
->state
);
1717 mutex_lock(&sync_active
);
1718 atomic_inc(&afu
->cmds_active
);
1719 buf
= kzalloc(sizeof(*cmd
) + __alignof__(*cmd
) - 1, GFP_KERNEL
);
1720 if (unlikely(!buf
)) {
1721 dev_err(dev
, "%s: no memory for command\n", __func__
);
1726 cmd
= (struct afu_cmd
*)PTR_ALIGN(buf
, __alignof__(*cmd
));
1727 init_completion(&cmd
->cevent
);
1730 pr_debug("%s: afu=%p cmd=%p %d\n", __func__
, afu
, cmd
, ctx_hndl_u
);
1732 cmd
->rcb
.req_flags
= SISL_REQ_FLAGS_AFU_CMD
;
1733 cmd
->rcb
.ctx_id
= afu
->ctx_hndl
;
1734 cmd
->rcb
.msi
= SISL_MSI_RRQ_UPDATED
;
1735 cmd
->rcb
.timeout
= MC_AFU_SYNC_TIMEOUT
;
1737 cmd
->rcb
.cdb
[0] = 0xC0; /* AFU Sync */
1738 cmd
->rcb
.cdb
[1] = mode
;
1740 /* The cdb is aligned, no unaligned accessors required */
1741 *((__be16
*)&cmd
->rcb
.cdb
[2]) = cpu_to_be16(ctx_hndl_u
);
1742 *((__be32
*)&cmd
->rcb
.cdb
[4]) = cpu_to_be32(res_hndl_u
);
1744 rc
= send_cmd(afu
, cmd
);
1748 rc
= wait_resp(afu
, cmd
);
1752 atomic_dec(&afu
->cmds_active
);
1753 mutex_unlock(&sync_active
);
1755 pr_debug("%s: returning rc=%d\n", __func__
, rc
);
1760 * afu_reset() - resets the AFU
1761 * @cfg: Internal structure associated with the host.
1763 * Return: 0 on success, -errno on failure
1765 static int afu_reset(struct cxlflash_cfg
*cfg
)
1768 /* Stop the context before the reset. Since the context is
1769 * no longer available restart it after the reset is complete
1776 pr_debug("%s: returning rc=%d\n", __func__
, rc
);
1781 * drain_ioctls() - wait until all currently executing ioctls have completed
1782 * @cfg: Internal structure associated with the host.
1784 * Obtain write access to read/write semaphore that wraps ioctl
1785 * handling to 'drain' ioctls currently executing.
1787 static void drain_ioctls(struct cxlflash_cfg
*cfg
)
1789 down_write(&cfg
->ioctl_rwsem
);
1790 up_write(&cfg
->ioctl_rwsem
);
1794 * cxlflash_eh_device_reset_handler() - reset a single LUN
1795 * @scp: SCSI command to send.
1798 * SUCCESS as defined in scsi/scsi.h
1799 * FAILED as defined in scsi/scsi.h
1801 static int cxlflash_eh_device_reset_handler(struct scsi_cmnd
*scp
)
1804 struct Scsi_Host
*host
= scp
->device
->host
;
1805 struct cxlflash_cfg
*cfg
= (struct cxlflash_cfg
*)host
->hostdata
;
1806 struct afu
*afu
= cfg
->afu
;
1809 pr_debug("%s: (scp=%p) %d/%d/%d/%llu "
1810 "cdb=(%08X-%08X-%08X-%08X)\n", __func__
, scp
,
1811 host
->host_no
, scp
->device
->channel
,
1812 scp
->device
->id
, scp
->device
->lun
,
1813 get_unaligned_be32(&((u32
*)scp
->cmnd
)[0]),
1814 get_unaligned_be32(&((u32
*)scp
->cmnd
)[1]),
1815 get_unaligned_be32(&((u32
*)scp
->cmnd
)[2]),
1816 get_unaligned_be32(&((u32
*)scp
->cmnd
)[3]));
1819 switch (cfg
->state
) {
1821 rcr
= send_tmf(afu
, scp
, TMF_LUN_RESET
);
1826 wait_event(cfg
->reset_waitq
, cfg
->state
!= STATE_RESET
);
1833 pr_debug("%s: returning rc=%d\n", __func__
, rc
);
1838 * cxlflash_eh_host_reset_handler() - reset the host adapter
1839 * @scp: SCSI command from stack identifying host.
1841 * Following a reset, the state is evaluated again in case an EEH occurred
1842 * during the reset. In such a scenario, the host reset will either yield
1843 * until the EEH recovery is complete or return success or failure based
1844 * upon the current device state.
1847 * SUCCESS as defined in scsi/scsi.h
1848 * FAILED as defined in scsi/scsi.h
1850 static int cxlflash_eh_host_reset_handler(struct scsi_cmnd
*scp
)
1854 struct Scsi_Host
*host
= scp
->device
->host
;
1855 struct cxlflash_cfg
*cfg
= (struct cxlflash_cfg
*)host
->hostdata
;
1857 pr_debug("%s: (scp=%p) %d/%d/%d/%llu "
1858 "cdb=(%08X-%08X-%08X-%08X)\n", __func__
, scp
,
1859 host
->host_no
, scp
->device
->channel
,
1860 scp
->device
->id
, scp
->device
->lun
,
1861 get_unaligned_be32(&((u32
*)scp
->cmnd
)[0]),
1862 get_unaligned_be32(&((u32
*)scp
->cmnd
)[1]),
1863 get_unaligned_be32(&((u32
*)scp
->cmnd
)[2]),
1864 get_unaligned_be32(&((u32
*)scp
->cmnd
)[3]));
1866 switch (cfg
->state
) {
1868 cfg
->state
= STATE_RESET
;
1870 cxlflash_mark_contexts_error(cfg
);
1871 rcr
= afu_reset(cfg
);
1874 cfg
->state
= STATE_FAILTERM
;
1876 cfg
->state
= STATE_NORMAL
;
1877 wake_up_all(&cfg
->reset_waitq
);
1881 wait_event(cfg
->reset_waitq
, cfg
->state
!= STATE_RESET
);
1882 if (cfg
->state
== STATE_NORMAL
)
1890 pr_debug("%s: returning rc=%d\n", __func__
, rc
);
1895 * cxlflash_change_queue_depth() - change the queue depth for the device
1896 * @sdev: SCSI device destined for queue depth change.
1897 * @qdepth: Requested queue depth value to set.
1899 * The requested queue depth is capped to the maximum supported value.
1901 * Return: The actual queue depth set.
1903 static int cxlflash_change_queue_depth(struct scsi_device
*sdev
, int qdepth
)
1906 if (qdepth
> CXLFLASH_MAX_CMDS_PER_LUN
)
1907 qdepth
= CXLFLASH_MAX_CMDS_PER_LUN
;
1909 scsi_change_queue_depth(sdev
, qdepth
);
1910 return sdev
->queue_depth
;
1914 * cxlflash_show_port_status() - queries and presents the current port status
1915 * @port: Desired port for status reporting.
1916 * @afu: AFU owning the specified port.
1917 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
1919 * Return: The size of the ASCII string returned in @buf.
1921 static ssize_t
cxlflash_show_port_status(u32 port
, struct afu
*afu
, char *buf
)
1925 __be64 __iomem
*fc_regs
;
1927 if (port
>= NUM_FC_PORTS
)
1930 fc_regs
= &afu
->afu_map
->global
.fc_regs
[port
][0];
1931 status
= readq_be(&fc_regs
[FC_MTIP_STATUS
/ 8]);
1932 status
&= FC_MTIP_STATUS_MASK
;
1934 if (status
== FC_MTIP_STATUS_ONLINE
)
1935 disp_status
= "online";
1936 else if (status
== FC_MTIP_STATUS_OFFLINE
)
1937 disp_status
= "offline";
1939 disp_status
= "unknown";
1941 return scnprintf(buf
, PAGE_SIZE
, "%s\n", disp_status
);
1945 * port0_show() - queries and presents the current status of port 0
1946 * @dev: Generic device associated with the host owning the port.
1947 * @attr: Device attribute representing the port.
1948 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
1950 * Return: The size of the ASCII string returned in @buf.
1952 static ssize_t
port0_show(struct device
*dev
,
1953 struct device_attribute
*attr
,
1956 struct Scsi_Host
*shost
= class_to_shost(dev
);
1957 struct cxlflash_cfg
*cfg
= (struct cxlflash_cfg
*)shost
->hostdata
;
1958 struct afu
*afu
= cfg
->afu
;
1960 return cxlflash_show_port_status(0, afu
, buf
);
1964 * port1_show() - queries and presents the current status of port 1
1965 * @dev: Generic device associated with the host owning the port.
1966 * @attr: Device attribute representing the port.
1967 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
1969 * Return: The size of the ASCII string returned in @buf.
1971 static ssize_t
port1_show(struct device
*dev
,
1972 struct device_attribute
*attr
,
1975 struct Scsi_Host
*shost
= class_to_shost(dev
);
1976 struct cxlflash_cfg
*cfg
= (struct cxlflash_cfg
*)shost
->hostdata
;
1977 struct afu
*afu
= cfg
->afu
;
1979 return cxlflash_show_port_status(1, afu
, buf
);
1983 * lun_mode_show() - presents the current LUN mode of the host
1984 * @dev: Generic device associated with the host.
1985 * @attr: Device attribute representing the LUN mode.
1986 * @buf: Buffer of length PAGE_SIZE to report back the LUN mode in ASCII.
1988 * Return: The size of the ASCII string returned in @buf.
1990 static ssize_t
lun_mode_show(struct device
*dev
,
1991 struct device_attribute
*attr
, char *buf
)
1993 struct Scsi_Host
*shost
= class_to_shost(dev
);
1994 struct cxlflash_cfg
*cfg
= (struct cxlflash_cfg
*)shost
->hostdata
;
1995 struct afu
*afu
= cfg
->afu
;
1997 return scnprintf(buf
, PAGE_SIZE
, "%u\n", afu
->internal_lun
);
2001 * lun_mode_store() - sets the LUN mode of the host
2002 * @dev: Generic device associated with the host.
2003 * @attr: Device attribute representing the LUN mode.
2004 * @buf: Buffer of length PAGE_SIZE containing the LUN mode in ASCII.
2005 * @count: Length of data resizing in @buf.
2007 * The CXL Flash AFU supports a dummy LUN mode where the external
2008 * links and storage are not required. Space on the FPGA is used
2009 * to create 1 or 2 small LUNs which are presented to the system
2010 * as if they were a normal storage device. This feature is useful
2011 * during development and also provides manufacturing with a way
2012 * to test the AFU without an actual device.
2014 * 0 = external LUN[s] (default)
2015 * 1 = internal LUN (1 x 64K, 512B blocks, id 0)
2016 * 2 = internal LUN (1 x 64K, 4K blocks, id 0)
2017 * 3 = internal LUN (2 x 32K, 512B blocks, ids 0,1)
2018 * 4 = internal LUN (2 x 32K, 4K blocks, ids 0,1)
2020 * Return: The size of the ASCII string returned in @buf.
2022 static ssize_t
lun_mode_store(struct device
*dev
,
2023 struct device_attribute
*attr
,
2024 const char *buf
, size_t count
)
2026 struct Scsi_Host
*shost
= class_to_shost(dev
);
2027 struct cxlflash_cfg
*cfg
= (struct cxlflash_cfg
*)shost
->hostdata
;
2028 struct afu
*afu
= cfg
->afu
;
2032 rc
= kstrtouint(buf
, 10, &lun_mode
);
2033 if (!rc
&& (lun_mode
< 5) && (lun_mode
!= afu
->internal_lun
)) {
2034 afu
->internal_lun
= lun_mode
;
2037 * When configured for internal LUN, there is only one channel,
2038 * channel number 0, else there will be 2 (default).
2040 if (afu
->internal_lun
)
2041 shost
->max_channel
= 0;
2043 shost
->max_channel
= NUM_FC_PORTS
- 1;
2046 scsi_scan_host(cfg
->host
);
2053 * ioctl_version_show() - presents the current ioctl version of the host
2054 * @dev: Generic device associated with the host.
2055 * @attr: Device attribute representing the ioctl version.
2056 * @buf: Buffer of length PAGE_SIZE to report back the ioctl version.
2058 * Return: The size of the ASCII string returned in @buf.
2060 static ssize_t
ioctl_version_show(struct device
*dev
,
2061 struct device_attribute
*attr
, char *buf
)
2063 return scnprintf(buf
, PAGE_SIZE
, "%u\n", DK_CXLFLASH_VERSION_0
);
2067 * cxlflash_show_port_lun_table() - queries and presents the port LUN table
2068 * @port: Desired port for status reporting.
2069 * @afu: AFU owning the specified port.
2070 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
2072 * Return: The size of the ASCII string returned in @buf.
2074 static ssize_t
cxlflash_show_port_lun_table(u32 port
,
2080 __be64 __iomem
*fc_port
;
2082 if (port
>= NUM_FC_PORTS
)
2085 fc_port
= &afu
->afu_map
->global
.fc_port
[port
][0];
2087 for (i
= 0; i
< CXLFLASH_NUM_VLUNS
; i
++)
2088 bytes
+= scnprintf(buf
+ bytes
, PAGE_SIZE
- bytes
,
2089 "%03d: %016llX\n", i
, readq_be(&fc_port
[i
]));
2094 * port0_lun_table_show() - presents the current LUN table of port 0
2095 * @dev: Generic device associated with the host owning the port.
2096 * @attr: Device attribute representing the port.
2097 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
2099 * Return: The size of the ASCII string returned in @buf.
2101 static ssize_t
port0_lun_table_show(struct device
*dev
,
2102 struct device_attribute
*attr
,
2105 struct Scsi_Host
*shost
= class_to_shost(dev
);
2106 struct cxlflash_cfg
*cfg
= (struct cxlflash_cfg
*)shost
->hostdata
;
2107 struct afu
*afu
= cfg
->afu
;
2109 return cxlflash_show_port_lun_table(0, afu
, buf
);
2113 * port1_lun_table_show() - presents the current LUN table of port 1
2114 * @dev: Generic device associated with the host owning the port.
2115 * @attr: Device attribute representing the port.
2116 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
2118 * Return: The size of the ASCII string returned in @buf.
2120 static ssize_t
port1_lun_table_show(struct device
*dev
,
2121 struct device_attribute
*attr
,
2124 struct Scsi_Host
*shost
= class_to_shost(dev
);
2125 struct cxlflash_cfg
*cfg
= (struct cxlflash_cfg
*)shost
->hostdata
;
2126 struct afu
*afu
= cfg
->afu
;
2128 return cxlflash_show_port_lun_table(1, afu
, buf
);
2132 * mode_show() - presents the current mode of the device
2133 * @dev: Generic device associated with the device.
2134 * @attr: Device attribute representing the device mode.
2135 * @buf: Buffer of length PAGE_SIZE to report back the dev mode in ASCII.
2137 * Return: The size of the ASCII string returned in @buf.
2139 static ssize_t
mode_show(struct device
*dev
,
2140 struct device_attribute
*attr
, char *buf
)
2142 struct scsi_device
*sdev
= to_scsi_device(dev
);
2144 return scnprintf(buf
, PAGE_SIZE
, "%s\n",
2145 sdev
->hostdata
? "superpipe" : "legacy");
2151 static DEVICE_ATTR_RO(port0
);
2152 static DEVICE_ATTR_RO(port1
);
2153 static DEVICE_ATTR_RW(lun_mode
);
2154 static DEVICE_ATTR_RO(ioctl_version
);
2155 static DEVICE_ATTR_RO(port0_lun_table
);
2156 static DEVICE_ATTR_RO(port1_lun_table
);
2158 static struct device_attribute
*cxlflash_host_attrs
[] = {
2162 &dev_attr_ioctl_version
,
2163 &dev_attr_port0_lun_table
,
2164 &dev_attr_port1_lun_table
,
2171 static DEVICE_ATTR_RO(mode
);
2173 static struct device_attribute
*cxlflash_dev_attrs
[] = {
2181 static struct scsi_host_template driver_template
= {
2182 .module
= THIS_MODULE
,
2183 .name
= CXLFLASH_ADAPTER_NAME
,
2184 .info
= cxlflash_driver_info
,
2185 .ioctl
= cxlflash_ioctl
,
2186 .proc_name
= CXLFLASH_NAME
,
2187 .queuecommand
= cxlflash_queuecommand
,
2188 .eh_device_reset_handler
= cxlflash_eh_device_reset_handler
,
2189 .eh_host_reset_handler
= cxlflash_eh_host_reset_handler
,
2190 .change_queue_depth
= cxlflash_change_queue_depth
,
2191 .cmd_per_lun
= CXLFLASH_MAX_CMDS_PER_LUN
,
2192 .can_queue
= CXLFLASH_MAX_CMDS
,
2193 .cmd_size
= sizeof(struct afu_cmd
) + __alignof__(struct afu_cmd
) - 1,
2195 .sg_tablesize
= 1, /* No scatter gather support */
2196 .max_sectors
= CXLFLASH_MAX_SECTORS
,
2197 .use_clustering
= ENABLE_CLUSTERING
,
2198 .shost_attrs
= cxlflash_host_attrs
,
2199 .sdev_attrs
= cxlflash_dev_attrs
,
2203 * Device dependent values
2205 static struct dev_dependent_vals dev_corsa_vals
= { CXLFLASH_MAX_SECTORS
,
2207 static struct dev_dependent_vals dev_flash_gt_vals
= { CXLFLASH_MAX_SECTORS
,
2208 CXLFLASH_NOTIFY_SHUTDOWN
};
2211 * PCI device binding table
2213 static struct pci_device_id cxlflash_pci_table
[] = {
2214 {PCI_VENDOR_ID_IBM
, PCI_DEVICE_ID_IBM_CORSA
,
2215 PCI_ANY_ID
, PCI_ANY_ID
, 0, 0, (kernel_ulong_t
)&dev_corsa_vals
},
2216 {PCI_VENDOR_ID_IBM
, PCI_DEVICE_ID_IBM_FLASH_GT
,
2217 PCI_ANY_ID
, PCI_ANY_ID
, 0, 0, (kernel_ulong_t
)&dev_flash_gt_vals
},
2221 MODULE_DEVICE_TABLE(pci
, cxlflash_pci_table
);
2224 * cxlflash_worker_thread() - work thread handler for the AFU
2225 * @work: Work structure contained within cxlflash associated with host.
2227 * Handles the following events:
2228 * - Link reset which cannot be performed on interrupt context due to
2229 * blocking up to a few seconds
2232 static void cxlflash_worker_thread(struct work_struct
*work
)
2234 struct cxlflash_cfg
*cfg
= container_of(work
, struct cxlflash_cfg
,
2236 struct afu
*afu
= cfg
->afu
;
2237 struct device
*dev
= &cfg
->dev
->dev
;
2241 /* Avoid MMIO if the device has failed */
2243 if (cfg
->state
!= STATE_NORMAL
)
2246 spin_lock_irqsave(cfg
->host
->host_lock
, lock_flags
);
2248 if (cfg
->lr_state
== LINK_RESET_REQUIRED
) {
2249 port
= cfg
->lr_port
;
2251 dev_err(dev
, "%s: invalid port index %d\n",
2254 spin_unlock_irqrestore(cfg
->host
->host_lock
,
2257 /* The reset can block... */
2258 afu_link_reset(afu
, port
,
2259 &afu
->afu_map
->global
.fc_regs
[port
][0]);
2260 spin_lock_irqsave(cfg
->host
->host_lock
, lock_flags
);
2263 cfg
->lr_state
= LINK_RESET_COMPLETE
;
2266 spin_unlock_irqrestore(cfg
->host
->host_lock
, lock_flags
);
2268 if (atomic_dec_if_positive(&cfg
->scan_host_needed
) >= 0)
2269 scsi_scan_host(cfg
->host
);
2270 kref_put(&afu
->mapcount
, afu_unmap
);
2274 * cxlflash_probe() - PCI entry point to add host
2275 * @pdev: PCI device associated with the host.
2276 * @dev_id: PCI device id associated with device.
2278 * Return: 0 on success, -errno on failure
2280 static int cxlflash_probe(struct pci_dev
*pdev
,
2281 const struct pci_device_id
*dev_id
)
2283 struct Scsi_Host
*host
;
2284 struct cxlflash_cfg
*cfg
= NULL
;
2285 struct dev_dependent_vals
*ddv
;
2288 dev_dbg(&pdev
->dev
, "%s: Found CXLFLASH with IRQ: %d\n",
2289 __func__
, pdev
->irq
);
2291 ddv
= (struct dev_dependent_vals
*)dev_id
->driver_data
;
2292 driver_template
.max_sectors
= ddv
->max_sectors
;
2294 host
= scsi_host_alloc(&driver_template
, sizeof(struct cxlflash_cfg
));
2296 dev_err(&pdev
->dev
, "%s: call to scsi_host_alloc failed!\n",
2302 host
->max_id
= CXLFLASH_MAX_NUM_TARGETS_PER_BUS
;
2303 host
->max_lun
= CXLFLASH_MAX_NUM_LUNS_PER_TARGET
;
2304 host
->max_channel
= NUM_FC_PORTS
- 1;
2305 host
->unique_id
= host
->host_no
;
2306 host
->max_cmd_len
= CXLFLASH_MAX_CDB_LEN
;
2308 cfg
= (struct cxlflash_cfg
*)host
->hostdata
;
2310 rc
= alloc_mem(cfg
);
2312 dev_err(&pdev
->dev
, "%s: call to alloc_mem failed!\n",
2315 scsi_host_put(cfg
->host
);
2319 cfg
->init_state
= INIT_STATE_NONE
;
2321 cfg
->cxl_fops
= cxlflash_cxl_fops
;
2324 * The promoted LUNs move to the top of the LUN table. The rest stay
2325 * on the bottom half. The bottom half grows from the end
2326 * (index = 255), whereas the top half grows from the beginning
2329 cfg
->promote_lun_index
= 0;
2330 cfg
->last_lun_index
[0] = CXLFLASH_NUM_VLUNS
/2 - 1;
2331 cfg
->last_lun_index
[1] = CXLFLASH_NUM_VLUNS
/2 - 1;
2333 cfg
->dev_id
= (struct pci_device_id
*)dev_id
;
2335 init_waitqueue_head(&cfg
->tmf_waitq
);
2336 init_waitqueue_head(&cfg
->reset_waitq
);
2338 INIT_WORK(&cfg
->work_q
, cxlflash_worker_thread
);
2339 cfg
->lr_state
= LINK_RESET_INVALID
;
2341 spin_lock_init(&cfg
->tmf_slock
);
2342 mutex_init(&cfg
->ctx_tbl_list_mutex
);
2343 mutex_init(&cfg
->ctx_recovery_mutex
);
2344 init_rwsem(&cfg
->ioctl_rwsem
);
2345 INIT_LIST_HEAD(&cfg
->ctx_err_recovery
);
2346 INIT_LIST_HEAD(&cfg
->lluns
);
2348 pci_set_drvdata(pdev
, cfg
);
2350 cfg
->cxl_afu
= cxl_pci_to_afu(pdev
);
2354 dev_err(&pdev
->dev
, "%s: call to init_pci "
2355 "failed rc=%d!\n", __func__
, rc
);
2358 cfg
->init_state
= INIT_STATE_PCI
;
2362 dev_err(&pdev
->dev
, "%s: call to init_afu "
2363 "failed rc=%d!\n", __func__
, rc
);
2366 cfg
->init_state
= INIT_STATE_AFU
;
2368 rc
= init_scsi(cfg
);
2370 dev_err(&pdev
->dev
, "%s: call to init_scsi "
2371 "failed rc=%d!\n", __func__
, rc
);
2374 cfg
->init_state
= INIT_STATE_SCSI
;
2377 pr_debug("%s: returning rc=%d\n", __func__
, rc
);
2381 cxlflash_remove(pdev
);
2386 * cxlflash_pci_error_detected() - called when a PCI error is detected
2387 * @pdev: PCI device struct.
2388 * @state: PCI channel state.
2390 * When an EEH occurs during an active reset, wait until the reset is
2391 * complete and then take action based upon the device state.
2393 * Return: PCI_ERS_RESULT_NEED_RESET or PCI_ERS_RESULT_DISCONNECT
2395 static pci_ers_result_t
cxlflash_pci_error_detected(struct pci_dev
*pdev
,
2396 pci_channel_state_t state
)
2399 struct cxlflash_cfg
*cfg
= pci_get_drvdata(pdev
);
2400 struct device
*dev
= &cfg
->dev
->dev
;
2402 dev_dbg(dev
, "%s: pdev=%p state=%u\n", __func__
, pdev
, state
);
2405 case pci_channel_io_frozen
:
2406 wait_event(cfg
->reset_waitq
, cfg
->state
!= STATE_RESET
);
2407 if (cfg
->state
== STATE_FAILTERM
)
2408 return PCI_ERS_RESULT_DISCONNECT
;
2410 cfg
->state
= STATE_RESET
;
2411 scsi_block_requests(cfg
->host
);
2413 rc
= cxlflash_mark_contexts_error(cfg
);
2415 dev_err(dev
, "%s: Failed to mark user contexts!(%d)\n",
2418 return PCI_ERS_RESULT_NEED_RESET
;
2419 case pci_channel_io_perm_failure
:
2420 cfg
->state
= STATE_FAILTERM
;
2421 wake_up_all(&cfg
->reset_waitq
);
2422 scsi_unblock_requests(cfg
->host
);
2423 return PCI_ERS_RESULT_DISCONNECT
;
2427 return PCI_ERS_RESULT_NEED_RESET
;
2431 * cxlflash_pci_slot_reset() - called when PCI slot has been reset
2432 * @pdev: PCI device struct.
2434 * This routine is called by the pci error recovery code after the PCI
2435 * slot has been reset, just before we should resume normal operations.
2437 * Return: PCI_ERS_RESULT_RECOVERED or PCI_ERS_RESULT_DISCONNECT
2439 static pci_ers_result_t
cxlflash_pci_slot_reset(struct pci_dev
*pdev
)
2442 struct cxlflash_cfg
*cfg
= pci_get_drvdata(pdev
);
2443 struct device
*dev
= &cfg
->dev
->dev
;
2445 dev_dbg(dev
, "%s: pdev=%p\n", __func__
, pdev
);
2449 dev_err(dev
, "%s: EEH recovery failed! (%d)\n", __func__
, rc
);
2450 return PCI_ERS_RESULT_DISCONNECT
;
2453 return PCI_ERS_RESULT_RECOVERED
;
2457 * cxlflash_pci_resume() - called when normal operation can resume
2458 * @pdev: PCI device struct
2460 static void cxlflash_pci_resume(struct pci_dev
*pdev
)
2462 struct cxlflash_cfg
*cfg
= pci_get_drvdata(pdev
);
2463 struct device
*dev
= &cfg
->dev
->dev
;
2465 dev_dbg(dev
, "%s: pdev=%p\n", __func__
, pdev
);
2467 cfg
->state
= STATE_NORMAL
;
2468 wake_up_all(&cfg
->reset_waitq
);
2469 scsi_unblock_requests(cfg
->host
);
2472 static const struct pci_error_handlers cxlflash_err_handler
= {
2473 .error_detected
= cxlflash_pci_error_detected
,
2474 .slot_reset
= cxlflash_pci_slot_reset
,
2475 .resume
= cxlflash_pci_resume
,
2479 * PCI device structure
2481 static struct pci_driver cxlflash_driver
= {
2482 .name
= CXLFLASH_NAME
,
2483 .id_table
= cxlflash_pci_table
,
2484 .probe
= cxlflash_probe
,
2485 .remove
= cxlflash_remove
,
2486 .shutdown
= cxlflash_remove
,
2487 .err_handler
= &cxlflash_err_handler
,
2491 * init_cxlflash() - module entry point
2493 * Return: 0 on success, -errno on failure
2495 static int __init
init_cxlflash(void)
2497 pr_info("%s: %s\n", __func__
, CXLFLASH_ADAPTER_NAME
);
2499 cxlflash_list_init();
2501 return pci_register_driver(&cxlflash_driver
);
2505 * exit_cxlflash() - module exit point
2507 static void __exit
exit_cxlflash(void)
2509 cxlflash_term_global_luns();
2510 cxlflash_free_errpage();
2512 pci_unregister_driver(&cxlflash_driver
);
2515 module_init(init_cxlflash
);
2516 module_exit(exit_cxlflash
);