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");
39 * cmd_checkout() - checks out an AFU command
40 * @afu: AFU to checkout from.
42 * Commands are checked out in a round-robin fashion. Note that since
43 * the command pool is larger than the hardware queue, the majority of
44 * times we will only loop once or twice before getting a command. The
45 * buffer and CDB within the command are initialized (zeroed) prior to
48 * Return: The checked out command or NULL when command pool is empty.
50 static struct afu_cmd
*cmd_checkout(struct afu
*afu
)
52 int k
, dec
= CXLFLASH_NUM_CMDS
;
56 k
= (afu
->cmd_couts
++ & (CXLFLASH_NUM_CMDS
- 1));
60 if (!atomic_dec_if_positive(&cmd
->free
)) {
61 pr_devel("%s: returning found index=%d cmd=%p\n",
62 __func__
, cmd
->slot
, cmd
);
63 memset(cmd
->buf
, 0, CMD_BUFSIZE
);
64 memset(cmd
->rcb
.cdb
, 0, sizeof(cmd
->rcb
.cdb
));
73 * cmd_checkin() - checks in an AFU command
74 * @cmd: AFU command to checkin.
76 * Safe to pass commands that have already been checked in. Several
77 * internal tracking fields are reset as part of the checkin. Note
78 * that these are intentionally reset prior to toggling the free bit
79 * to avoid clobbering values in the event that the command is checked
82 static void cmd_checkin(struct afu_cmd
*cmd
)
88 cmd
->sa
.host_use
[0] = 0; /* clears both completion and retry bytes */
90 if (unlikely(atomic_inc_return(&cmd
->free
) != 1)) {
91 pr_err("%s: Freeing cmd (%d) that is not in use!\n",
96 pr_devel("%s: released cmd %p index=%d\n", __func__
, cmd
, cmd
->slot
);
100 * process_cmd_err() - command error handler
101 * @cmd: AFU command that experienced the error.
102 * @scp: SCSI command associated with the AFU command in error.
104 * Translates error bits from AFU command to SCSI command results.
106 static void process_cmd_err(struct afu_cmd
*cmd
, struct scsi_cmnd
*scp
)
108 struct sisl_ioarcb
*ioarcb
;
109 struct sisl_ioasa
*ioasa
;
115 ioarcb
= &(cmd
->rcb
);
118 if (ioasa
->rc
.flags
& SISL_RC_FLAGS_UNDERRUN
) {
119 resid
= ioasa
->resid
;
120 scsi_set_resid(scp
, resid
);
121 pr_debug("%s: cmd underrun cmd = %p scp = %p, resid = %d\n",
122 __func__
, cmd
, scp
, resid
);
125 if (ioasa
->rc
.flags
& SISL_RC_FLAGS_OVERRUN
) {
126 pr_debug("%s: cmd underrun cmd = %p scp = %p\n",
128 scp
->result
= (DID_ERROR
<< 16);
131 pr_debug("%s: cmd failed afu_rc=%d scsi_rc=%d fc_rc=%d "
132 "afu_extra=0x%X, scsi_extra=0x%X, fc_extra=0x%X\n",
133 __func__
, ioasa
->rc
.afu_rc
, ioasa
->rc
.scsi_rc
,
134 ioasa
->rc
.fc_rc
, ioasa
->afu_extra
, ioasa
->scsi_extra
,
137 if (ioasa
->rc
.scsi_rc
) {
138 /* We have a SCSI status */
139 if (ioasa
->rc
.flags
& SISL_RC_FLAGS_SENSE_VALID
) {
140 memcpy(scp
->sense_buffer
, ioasa
->sense_data
,
141 SISL_SENSE_DATA_LEN
);
142 scp
->result
= ioasa
->rc
.scsi_rc
;
144 scp
->result
= ioasa
->rc
.scsi_rc
| (DID_ERROR
<< 16);
148 * We encountered an error. Set scp->result based on nature
151 if (ioasa
->rc
.fc_rc
) {
152 /* We have an FC status */
153 switch (ioasa
->rc
.fc_rc
) {
154 case SISL_FC_RC_LINKDOWN
:
155 scp
->result
= (DID_REQUEUE
<< 16);
157 case SISL_FC_RC_RESID
:
158 /* This indicates an FCP resid underrun */
159 if (!(ioasa
->rc
.flags
& SISL_RC_FLAGS_OVERRUN
)) {
160 /* If the SISL_RC_FLAGS_OVERRUN flag was set,
161 * then we will handle this error else where.
162 * If not then we must handle it here.
163 * This is probably an AFU bug.
165 scp
->result
= (DID_ERROR
<< 16);
168 case SISL_FC_RC_RESIDERR
:
169 /* Resid mismatch between adapter and device */
170 case SISL_FC_RC_TGTABORT
:
171 case SISL_FC_RC_ABORTOK
:
172 case SISL_FC_RC_ABORTFAIL
:
173 case SISL_FC_RC_NOLOGI
:
174 case SISL_FC_RC_ABORTPEND
:
175 case SISL_FC_RC_WRABORTPEND
:
176 case SISL_FC_RC_NOEXP
:
177 case SISL_FC_RC_INUSE
:
178 scp
->result
= (DID_ERROR
<< 16);
183 if (ioasa
->rc
.afu_rc
) {
184 /* We have an AFU error */
185 switch (ioasa
->rc
.afu_rc
) {
186 case SISL_AFU_RC_NO_CHANNELS
:
187 scp
->result
= (DID_NO_CONNECT
<< 16);
189 case SISL_AFU_RC_DATA_DMA_ERR
:
190 switch (ioasa
->afu_extra
) {
191 case SISL_AFU_DMA_ERR_PAGE_IN
:
193 scp
->result
= (DID_IMM_RETRY
<< 16);
195 case SISL_AFU_DMA_ERR_INVALID_EA
:
197 scp
->result
= (DID_ERROR
<< 16);
200 case SISL_AFU_RC_OUT_OF_DATA_BUFS
:
202 scp
->result
= (DID_ALLOC_FAILURE
<< 16);
205 scp
->result
= (DID_ERROR
<< 16);
211 * cmd_complete() - command completion handler
212 * @cmd: AFU command that has completed.
214 * Prepares and submits command that has either completed or timed out to
215 * the SCSI stack. Checks AFU command back into command pool for non-internal
216 * (rcb.scp populated) commands.
218 static void cmd_complete(struct afu_cmd
*cmd
)
220 struct scsi_cmnd
*scp
;
222 struct afu
*afu
= cmd
->parent
;
223 struct cxlflash_cfg
*cfg
= afu
->parent
;
226 spin_lock_irqsave(&cmd
->slock
, lock_flags
);
227 cmd
->sa
.host_use_b
[0] |= B_DONE
;
228 spin_unlock_irqrestore(&cmd
->slock
, lock_flags
);
232 if (unlikely(cmd
->sa
.ioasc
))
233 process_cmd_err(cmd
, scp
);
235 scp
->result
= (DID_OK
<< 16);
237 cmd_is_tmf
= cmd
->cmd_tmf
;
238 cmd_checkin(cmd
); /* Don't use cmd after here */
240 pr_debug_ratelimited("%s: calling scsi_done scp=%p result=%X "
241 "ioasc=%d\n", __func__
, scp
, scp
->result
,
248 spin_lock_irqsave(&cfg
->tmf_slock
, lock_flags
);
249 cfg
->tmf_active
= false;
250 wake_up_all_locked(&cfg
->tmf_waitq
);
251 spin_unlock_irqrestore(&cfg
->tmf_slock
, lock_flags
);
254 complete(&cmd
->cevent
);
258 * context_reset() - timeout handler for AFU commands
259 * @cmd: AFU command that timed out.
261 * Sends a reset to the AFU.
263 static void context_reset(struct afu_cmd
*cmd
)
268 struct afu
*afu
= cmd
->parent
;
271 pr_debug("%s: cmd=%p\n", __func__
, cmd
);
273 spin_lock_irqsave(&cmd
->slock
, lock_flags
);
275 /* Already completed? */
276 if (cmd
->sa
.host_use_b
[0] & B_DONE
) {
277 spin_unlock_irqrestore(&cmd
->slock
, lock_flags
);
281 cmd
->sa
.host_use_b
[0] |= (B_DONE
| B_ERROR
| B_TIMEOUT
);
282 spin_unlock_irqrestore(&cmd
->slock
, lock_flags
);
285 * We really want to send this reset at all costs, so spread
286 * out wait time on successive retries for available room.
289 room
= readq_be(&afu
->host_map
->cmd_room
);
290 atomic64_set(&afu
->room
, room
);
294 } while (nretry
++ < MC_ROOM_RETRY_CNT
);
296 pr_err("%s: no cmd_room to send reset\n", __func__
);
301 writeq_be(rrin
, &afu
->host_map
->ioarrin
);
303 rrin
= readq_be(&afu
->host_map
->ioarrin
);
306 /* Double delay each time */
308 } while (nretry
++ < MC_ROOM_RETRY_CNT
);
312 * send_cmd() - sends an AFU command
313 * @afu: AFU associated with the host.
314 * @cmd: AFU command to send.
317 * 0 on success or SCSI_MLQUEUE_HOST_BUSY
319 static int send_cmd(struct afu
*afu
, struct afu_cmd
*cmd
)
321 struct cxlflash_cfg
*cfg
= afu
->parent
;
322 struct device
*dev
= &cfg
->dev
->dev
;
329 * This routine is used by critical users such an AFU sync and to
330 * send a task management function (TMF). Thus we want to retry a
331 * bit before returning an error. To avoid the performance penalty
332 * of MMIO, we spread the update of 'room' over multiple commands.
335 newval
= atomic64_dec_if_positive(&afu
->room
);
338 room
= readq_be(&afu
->host_map
->cmd_room
);
339 atomic64_set(&afu
->room
, room
);
343 } while (nretry
++ < MC_ROOM_RETRY_CNT
);
345 dev_err(dev
, "%s: no cmd_room to send 0x%X\n",
346 __func__
, cmd
->rcb
.cdb
[0]);
349 } else if (unlikely(newval
< 0)) {
350 /* This should be rare. i.e. Only if two threads race and
351 * decrement before the MMIO read is done. In this case
352 * just benefit from the other thread having updated
355 if (nretry
++ < MC_ROOM_RETRY_CNT
) {
364 writeq_be((u64
)&cmd
->rcb
, &afu
->host_map
->ioarrin
);
366 pr_devel("%s: cmd=%p len=%d ea=%p rc=%d\n", __func__
, cmd
,
367 cmd
->rcb
.data_len
, (void *)cmd
->rcb
.data_ea
, rc
);
371 afu
->read_room
= true;
372 schedule_work(&cfg
->work_q
);
373 rc
= SCSI_MLQUEUE_HOST_BUSY
;
378 * wait_resp() - polls for a response or timeout to a sent AFU command
379 * @afu: AFU associated with the host.
380 * @cmd: AFU command that was sent.
382 static void wait_resp(struct afu
*afu
, struct afu_cmd
*cmd
)
384 ulong timeout
= msecs_to_jiffies(cmd
->rcb
.timeout
* 2 * 1000);
386 timeout
= wait_for_completion_timeout(&cmd
->cevent
, timeout
);
390 if (unlikely(cmd
->sa
.ioasc
!= 0))
391 pr_err("%s: CMD 0x%X failed, IOASC: flags 0x%X, afu_rc 0x%X, "
392 "scsi_rc 0x%X, fc_rc 0x%X\n", __func__
, cmd
->rcb
.cdb
[0],
393 cmd
->sa
.rc
.flags
, cmd
->sa
.rc
.afu_rc
, cmd
->sa
.rc
.scsi_rc
,
398 * send_tmf() - sends a Task Management Function (TMF)
399 * @afu: AFU to checkout from.
400 * @scp: SCSI command from stack.
401 * @tmfcmd: TMF command to send.
405 * SCSI_MLQUEUE_HOST_BUSY when host is busy
407 static int send_tmf(struct afu
*afu
, struct scsi_cmnd
*scp
, u64 tmfcmd
)
411 u32 port_sel
= scp
->device
->channel
+ 1;
413 struct Scsi_Host
*host
= scp
->device
->host
;
414 struct cxlflash_cfg
*cfg
= (struct cxlflash_cfg
*)host
->hostdata
;
415 struct device
*dev
= &cfg
->dev
->dev
;
420 cmd
= cmd_checkout(afu
);
421 if (unlikely(!cmd
)) {
422 dev_err(dev
, "%s: could not get a free command\n", __func__
);
423 rc
= SCSI_MLQUEUE_HOST_BUSY
;
427 /* When Task Management Function is active do not send another */
428 spin_lock_irqsave(&cfg
->tmf_slock
, lock_flags
);
430 wait_event_interruptible_lock_irq(cfg
->tmf_waitq
,
433 cfg
->tmf_active
= true;
435 spin_unlock_irqrestore(&cfg
->tmf_slock
, lock_flags
);
437 cmd
->rcb
.ctx_id
= afu
->ctx_hndl
;
438 cmd
->rcb
.port_sel
= port_sel
;
439 cmd
->rcb
.lun_id
= lun_to_lunid(scp
->device
->lun
);
441 lflag
= SISL_REQ_FLAGS_TMF_CMD
;
443 cmd
->rcb
.req_flags
= (SISL_REQ_FLAGS_PORT_LUN_ID
|
444 SISL_REQ_FLAGS_SUP_UNDERRUN
| lflag
);
446 /* Stash the scp in the reserved field, for reuse during interrupt */
449 /* Copy the CDB from the cmd passed in */
450 memcpy(cmd
->rcb
.cdb
, &tmfcmd
, sizeof(tmfcmd
));
452 /* Send the command */
453 rc
= send_cmd(afu
, cmd
);
456 spin_lock_irqsave(&cfg
->tmf_slock
, lock_flags
);
457 cfg
->tmf_active
= false;
458 spin_unlock_irqrestore(&cfg
->tmf_slock
, lock_flags
);
462 spin_lock_irqsave(&cfg
->tmf_slock
, lock_flags
);
463 to
= msecs_to_jiffies(5000);
464 to
= wait_event_interruptible_lock_irq_timeout(cfg
->tmf_waitq
,
469 cfg
->tmf_active
= false;
470 dev_err(dev
, "%s: TMF timed out!\n", __func__
);
473 spin_unlock_irqrestore(&cfg
->tmf_slock
, lock_flags
);
479 * cxlflash_driver_info() - information handler for this host driver
480 * @host: SCSI host associated with device.
482 * Return: A string describing the device.
484 static const char *cxlflash_driver_info(struct Scsi_Host
*host
)
486 return CXLFLASH_ADAPTER_NAME
;
490 * cxlflash_queuecommand() - sends a mid-layer request
491 * @host: SCSI host associated with device.
492 * @scp: SCSI command to send.
496 * SCSI_MLQUEUE_HOST_BUSY when host is busy
498 static int cxlflash_queuecommand(struct Scsi_Host
*host
, struct scsi_cmnd
*scp
)
500 struct cxlflash_cfg
*cfg
= (struct cxlflash_cfg
*)host
->hostdata
;
501 struct afu
*afu
= cfg
->afu
;
502 struct device
*dev
= &cfg
->dev
->dev
;
504 u32 port_sel
= scp
->device
->channel
+ 1;
506 struct scatterlist
*sg
;
511 dev_dbg_ratelimited(dev
, "%s: (scp=%p) %d/%d/%d/%llu "
512 "cdb=(%08X-%08X-%08X-%08X)\n",
513 __func__
, scp
, host
->host_no
, scp
->device
->channel
,
514 scp
->device
->id
, scp
->device
->lun
,
515 get_unaligned_be32(&((u32
*)scp
->cmnd
)[0]),
516 get_unaligned_be32(&((u32
*)scp
->cmnd
)[1]),
517 get_unaligned_be32(&((u32
*)scp
->cmnd
)[2]),
518 get_unaligned_be32(&((u32
*)scp
->cmnd
)[3]));
521 * If a Task Management Function is active, wait for it to complete
522 * before continuing with regular commands.
524 spin_lock_irqsave(&cfg
->tmf_slock
, lock_flags
);
525 if (cfg
->tmf_active
) {
526 spin_unlock_irqrestore(&cfg
->tmf_slock
, lock_flags
);
527 rc
= SCSI_MLQUEUE_HOST_BUSY
;
530 spin_unlock_irqrestore(&cfg
->tmf_slock
, lock_flags
);
532 switch (cfg
->state
) {
534 dev_dbg_ratelimited(dev
, "%s: device is in reset!\n", __func__
);
535 rc
= SCSI_MLQUEUE_HOST_BUSY
;
538 dev_dbg_ratelimited(dev
, "%s: device has failed!\n", __func__
);
539 scp
->result
= (DID_NO_CONNECT
<< 16);
547 cmd
= cmd_checkout(afu
);
548 if (unlikely(!cmd
)) {
549 dev_err(dev
, "%s: could not get a free command\n", __func__
);
550 rc
= SCSI_MLQUEUE_HOST_BUSY
;
554 cmd
->rcb
.ctx_id
= afu
->ctx_hndl
;
555 cmd
->rcb
.port_sel
= port_sel
;
556 cmd
->rcb
.lun_id
= lun_to_lunid(scp
->device
->lun
);
558 if (scp
->sc_data_direction
== DMA_TO_DEVICE
)
559 lflag
= SISL_REQ_FLAGS_HOST_WRITE
;
561 lflag
= SISL_REQ_FLAGS_HOST_READ
;
563 cmd
->rcb
.req_flags
= (SISL_REQ_FLAGS_PORT_LUN_ID
|
564 SISL_REQ_FLAGS_SUP_UNDERRUN
| lflag
);
566 /* Stash the scp in the reserved field, for reuse during interrupt */
569 nseg
= scsi_dma_map(scp
);
570 if (unlikely(nseg
< 0)) {
571 dev_err(dev
, "%s: Fail DMA map! nseg=%d\n",
573 rc
= SCSI_MLQUEUE_HOST_BUSY
;
577 ncount
= scsi_sg_count(scp
);
578 scsi_for_each_sg(scp
, sg
, ncount
, i
) {
579 cmd
->rcb
.data_len
= sg_dma_len(sg
);
580 cmd
->rcb
.data_ea
= sg_dma_address(sg
);
583 /* Copy the CDB from the scsi_cmnd passed in */
584 memcpy(cmd
->rcb
.cdb
, scp
->cmnd
, sizeof(cmd
->rcb
.cdb
));
586 /* Send the command */
587 rc
= send_cmd(afu
, cmd
);
594 pr_devel("%s: returning rc=%d\n", __func__
, rc
);
599 * cxlflash_wait_for_pci_err_recovery() - wait for error recovery during probe
600 * @cxlflash: Internal structure associated with the host.
602 static void cxlflash_wait_for_pci_err_recovery(struct cxlflash_cfg
*cfg
)
604 struct pci_dev
*pdev
= cfg
->dev
;
606 if (pci_channel_offline(pdev
))
607 wait_event_timeout(cfg
->reset_waitq
,
608 !pci_channel_offline(pdev
),
609 CXLFLASH_PCI_ERROR_RECOVERY_TIMEOUT
);
613 * free_mem() - free memory associated with the AFU
614 * @cxlflash: Internal structure associated with the host.
616 static void free_mem(struct cxlflash_cfg
*cfg
)
620 struct afu
*afu
= cfg
->afu
;
623 for (i
= 0; i
< CXLFLASH_NUM_CMDS
; i
++) {
624 buf
= afu
->cmd
[i
].buf
;
625 if (!((u64
)buf
& (PAGE_SIZE
- 1)))
626 free_page((ulong
)buf
);
629 free_pages((ulong
)afu
, get_order(sizeof(struct afu
)));
635 * stop_afu() - stops the AFU command timers and unmaps the MMIO space
636 * @cxlflash: Internal structure associated with the host.
638 * Safe to call with AFU in a partially allocated/initialized state.
640 static void stop_afu(struct cxlflash_cfg
*cfg
)
643 struct afu
*afu
= cfg
->afu
;
646 for (i
= 0; i
< CXLFLASH_NUM_CMDS
; i
++)
647 complete(&afu
->cmd
[i
].cevent
);
649 if (likely(afu
->afu_map
)) {
650 cxl_psa_unmap((void *)afu
->afu_map
);
657 * term_mc() - terminates the master context
658 * @cxlflash: Internal structure associated with the host.
659 * @level: Depth of allocation, where to begin waterfall tear down.
661 * Safe to call with AFU/MC in partially allocated/initialized state.
663 static void term_mc(struct cxlflash_cfg
*cfg
, enum undo_level level
)
666 struct afu
*afu
= cfg
->afu
;
667 struct device
*dev
= &cfg
->dev
->dev
;
669 if (!afu
|| !cfg
->mcctx
) {
670 dev_err(dev
, "%s: returning from term_mc with NULL afu or MC\n",
677 rc
= cxl_stop_context(cfg
->mcctx
);
680 cxl_unmap_afu_irq(cfg
->mcctx
, 3, afu
);
682 cxl_unmap_afu_irq(cfg
->mcctx
, 2, afu
);
684 cxl_unmap_afu_irq(cfg
->mcctx
, 1, afu
);
686 cxl_free_afu_irqs(cfg
->mcctx
);
687 case RELEASE_CONTEXT
:
693 * term_afu() - terminates the AFU
694 * @cxlflash: Internal structure associated with the host.
696 * Safe to call with AFU/MC in partially allocated/initialized state.
698 static void term_afu(struct cxlflash_cfg
*cfg
)
700 term_mc(cfg
, UNDO_START
);
705 pr_debug("%s: returning\n", __func__
);
709 * cxlflash_remove() - PCI entry point to tear down host
710 * @pdev: PCI device associated with the host.
712 * Safe to use as a cleanup in partially allocated/initialized state.
714 static void cxlflash_remove(struct pci_dev
*pdev
)
716 struct cxlflash_cfg
*cfg
= pci_get_drvdata(pdev
);
719 /* If a Task Management Function is active, wait for it to complete
720 * before continuing with remove.
722 spin_lock_irqsave(&cfg
->tmf_slock
, lock_flags
);
724 wait_event_interruptible_lock_irq(cfg
->tmf_waitq
,
727 spin_unlock_irqrestore(&cfg
->tmf_slock
, lock_flags
);
729 cfg
->state
= STATE_FAILTERM
;
730 cxlflash_stop_term_user_contexts(cfg
);
732 switch (cfg
->init_state
) {
733 case INIT_STATE_SCSI
:
734 cxlflash_term_local_luns(cfg
);
735 scsi_remove_host(cfg
->host
);
740 pci_release_regions(cfg
->dev
);
741 pci_disable_device(pdev
);
742 case INIT_STATE_NONE
:
743 flush_work(&cfg
->work_q
);
745 scsi_host_put(cfg
->host
);
749 pr_debug("%s: returning\n", __func__
);
753 * alloc_mem() - allocates the AFU and its command pool
754 * @cxlflash: Internal structure associated with the host.
756 * A partially allocated state remains on failure.
760 * -ENOMEM on failure to allocate memory
762 static int alloc_mem(struct cxlflash_cfg
*cfg
)
767 struct device
*dev
= &cfg
->dev
->dev
;
769 /* This allocation is about 12K, i.e. only 1 64k page
770 * and upto 4 4k pages
772 cfg
->afu
= (void *)__get_free_pages(GFP_KERNEL
| __GFP_ZERO
,
773 get_order(sizeof(struct afu
)));
774 if (unlikely(!cfg
->afu
)) {
775 dev_err(dev
, "%s: cannot get %d free pages\n",
776 __func__
, get_order(sizeof(struct afu
)));
780 cfg
->afu
->parent
= cfg
;
781 cfg
->afu
->afu_map
= NULL
;
783 for (i
= 0; i
< CXLFLASH_NUM_CMDS
; buf
+= CMD_BUFSIZE
, i
++) {
784 if (!((u64
)buf
& (PAGE_SIZE
- 1))) {
785 buf
= (void *)__get_free_page(GFP_KERNEL
| __GFP_ZERO
);
786 if (unlikely(!buf
)) {
788 "%s: Allocate command buffers fail!\n",
796 cfg
->afu
->cmd
[i
].buf
= buf
;
797 atomic_set(&cfg
->afu
->cmd
[i
].free
, 1);
798 cfg
->afu
->cmd
[i
].slot
= i
;
806 * init_pci() - initializes the host as a PCI device
807 * @cxlflash: Internal structure associated with the host.
811 * -EIO on unable to communicate with device
812 * A return code from the PCI sub-routines
814 static int init_pci(struct cxlflash_cfg
*cfg
)
816 struct pci_dev
*pdev
= cfg
->dev
;
819 cfg
->cxlflash_regs_pci
= pci_resource_start(pdev
, 0);
820 rc
= pci_request_regions(pdev
, CXLFLASH_NAME
);
823 "%s: Couldn't register memory range of registers\n",
828 rc
= pci_enable_device(pdev
);
829 if (rc
|| pci_channel_offline(pdev
)) {
830 if (pci_channel_offline(pdev
)) {
831 cxlflash_wait_for_pci_err_recovery(cfg
);
832 rc
= pci_enable_device(pdev
);
836 dev_err(&pdev
->dev
, "%s: Cannot enable adapter\n",
838 cxlflash_wait_for_pci_err_recovery(cfg
);
839 goto out_release_regions
;
843 rc
= pci_set_dma_mask(pdev
, DMA_BIT_MASK(64));
845 dev_dbg(&pdev
->dev
, "%s: Failed to set 64 bit PCI DMA mask\n",
847 rc
= pci_set_dma_mask(pdev
, DMA_BIT_MASK(32));
851 dev_err(&pdev
->dev
, "%s: Failed to set PCI DMA mask\n",
856 pci_set_master(pdev
);
858 if (pci_channel_offline(pdev
)) {
859 cxlflash_wait_for_pci_err_recovery(cfg
);
860 if (pci_channel_offline(pdev
)) {
862 goto out_msi_disable
;
866 rc
= pci_save_state(pdev
);
868 if (rc
!= PCIBIOS_SUCCESSFUL
) {
869 dev_err(&pdev
->dev
, "%s: Failed to save PCI config space\n",
876 pr_debug("%s: returning rc=%d\n", __func__
, rc
);
881 cxlflash_wait_for_pci_err_recovery(cfg
);
883 pci_disable_device(pdev
);
885 pci_release_regions(pdev
);
891 * init_scsi() - adds the host to the SCSI stack and kicks off host scan
892 * @cxlflash: Internal structure associated with the host.
896 * A return code from adding the host
898 static int init_scsi(struct cxlflash_cfg
*cfg
)
900 struct pci_dev
*pdev
= cfg
->dev
;
903 rc
= scsi_add_host(cfg
->host
, &pdev
->dev
);
905 dev_err(&pdev
->dev
, "%s: scsi_add_host failed (rc=%d)\n",
910 scsi_scan_host(cfg
->host
);
913 pr_debug("%s: returning rc=%d\n", __func__
, rc
);
918 * set_port_online() - transitions the specified host FC port to online state
919 * @fc_regs: Top of MMIO region defined for specified port.
921 * The provided MMIO region must be mapped prior to call. Online state means
922 * that the FC link layer has synced, completed the handshaking process, and
923 * is ready for login to start.
925 static void set_port_online(u64
*fc_regs
)
929 cmdcfg
= readq_be(&fc_regs
[FC_MTIP_CMDCONFIG
/ 8]);
930 cmdcfg
&= (~FC_MTIP_CMDCONFIG_OFFLINE
); /* clear OFF_LINE */
931 cmdcfg
|= (FC_MTIP_CMDCONFIG_ONLINE
); /* set ON_LINE */
932 writeq_be(cmdcfg
, &fc_regs
[FC_MTIP_CMDCONFIG
/ 8]);
936 * set_port_offline() - transitions the specified host FC port to offline state
937 * @fc_regs: Top of MMIO region defined for specified port.
939 * The provided MMIO region must be mapped prior to call.
941 static void set_port_offline(u64
*fc_regs
)
945 cmdcfg
= readq_be(&fc_regs
[FC_MTIP_CMDCONFIG
/ 8]);
946 cmdcfg
&= (~FC_MTIP_CMDCONFIG_ONLINE
); /* clear ON_LINE */
947 cmdcfg
|= (FC_MTIP_CMDCONFIG_OFFLINE
); /* set OFF_LINE */
948 writeq_be(cmdcfg
, &fc_regs
[FC_MTIP_CMDCONFIG
/ 8]);
952 * wait_port_online() - waits for the specified host FC port come online
953 * @fc_regs: Top of MMIO region defined for specified port.
954 * @delay_us: Number of microseconds to delay between reading port status.
955 * @nretry: Number of cycles to retry reading port status.
957 * The provided MMIO region must be mapped prior to call. This will timeout
958 * when the cable is not plugged in.
961 * TRUE (1) when the specified port is online
962 * FALSE (0) when the specified port fails to come online after timeout
963 * -EINVAL when @delay_us is less than 1000
965 static int wait_port_online(u64
*fc_regs
, u32 delay_us
, u32 nretry
)
969 if (delay_us
< 1000) {
970 pr_err("%s: invalid delay specified %d\n", __func__
, delay_us
);
975 msleep(delay_us
/ 1000);
976 status
= readq_be(&fc_regs
[FC_MTIP_STATUS
/ 8]);
977 } while ((status
& FC_MTIP_STATUS_MASK
) != FC_MTIP_STATUS_ONLINE
&&
980 return ((status
& FC_MTIP_STATUS_MASK
) == FC_MTIP_STATUS_ONLINE
);
984 * wait_port_offline() - waits for the specified host FC port go offline
985 * @fc_regs: Top of MMIO region defined for specified port.
986 * @delay_us: Number of microseconds to delay between reading port status.
987 * @nretry: Number of cycles to retry reading port status.
989 * The provided MMIO region must be mapped prior to call.
992 * TRUE (1) when the specified port is offline
993 * FALSE (0) when the specified port fails to go offline after timeout
994 * -EINVAL when @delay_us is less than 1000
996 static int wait_port_offline(u64
*fc_regs
, u32 delay_us
, u32 nretry
)
1000 if (delay_us
< 1000) {
1001 pr_err("%s: invalid delay specified %d\n", __func__
, delay_us
);
1006 msleep(delay_us
/ 1000);
1007 status
= readq_be(&fc_regs
[FC_MTIP_STATUS
/ 8]);
1008 } while ((status
& FC_MTIP_STATUS_MASK
) != FC_MTIP_STATUS_OFFLINE
&&
1011 return ((status
& FC_MTIP_STATUS_MASK
) == FC_MTIP_STATUS_OFFLINE
);
1015 * afu_set_wwpn() - configures the WWPN for the specified host FC port
1016 * @afu: AFU associated with the host that owns the specified FC port.
1017 * @port: Port number being configured.
1018 * @fc_regs: Top of MMIO region defined for specified port.
1019 * @wwpn: The world-wide-port-number previously discovered for port.
1021 * The provided MMIO region must be mapped prior to call. As part of the
1022 * sequence to configure the WWPN, the port is toggled offline and then back
1023 * online. This toggling action can cause this routine to delay up to a few
1024 * seconds. When configured to use the internal LUN feature of the AFU, a
1025 * failure to come online is overridden.
1028 * 0 when the WWPN is successfully written and the port comes back online
1029 * -1 when the port fails to go offline or come back up online
1031 static int afu_set_wwpn(struct afu
*afu
, int port
, u64
*fc_regs
, u64 wwpn
)
1035 set_port_offline(fc_regs
);
1037 if (!wait_port_offline(fc_regs
, FC_PORT_STATUS_RETRY_INTERVAL_US
,
1038 FC_PORT_STATUS_RETRY_CNT
)) {
1039 pr_debug("%s: wait on port %d to go offline timed out\n",
1041 rc
= -1; /* but continue on to leave the port back online */
1045 writeq_be(wwpn
, &fc_regs
[FC_PNAME
/ 8]);
1047 /* Always return success after programming WWPN */
1050 set_port_online(fc_regs
);
1052 if (!wait_port_online(fc_regs
, FC_PORT_STATUS_RETRY_INTERVAL_US
,
1053 FC_PORT_STATUS_RETRY_CNT
)) {
1054 pr_err("%s: wait on port %d to go online timed out\n",
1058 pr_debug("%s: returning rc=%d\n", __func__
, rc
);
1064 * afu_link_reset() - resets the specified host FC port
1065 * @afu: AFU associated with the host that owns the specified FC port.
1066 * @port: Port number being configured.
1067 * @fc_regs: Top of MMIO region defined for specified port.
1069 * The provided MMIO region must be mapped prior to call. The sequence to
1070 * reset the port involves toggling it offline and then back online. This
1071 * action can cause this routine to delay up to a few seconds. An effort
1072 * is made to maintain link with the device by switching to host to use
1073 * the alternate port exclusively while the reset takes place.
1074 * failure to come online is overridden.
1076 static void afu_link_reset(struct afu
*afu
, int port
, u64
*fc_regs
)
1080 /* first switch the AFU to the other links, if any */
1081 port_sel
= readq_be(&afu
->afu_map
->global
.regs
.afu_port_sel
);
1082 port_sel
&= ~(1ULL << port
);
1083 writeq_be(port_sel
, &afu
->afu_map
->global
.regs
.afu_port_sel
);
1084 cxlflash_afu_sync(afu
, 0, 0, AFU_GSYNC
);
1086 set_port_offline(fc_regs
);
1087 if (!wait_port_offline(fc_regs
, FC_PORT_STATUS_RETRY_INTERVAL_US
,
1088 FC_PORT_STATUS_RETRY_CNT
))
1089 pr_err("%s: wait on port %d to go offline timed out\n",
1092 set_port_online(fc_regs
);
1093 if (!wait_port_online(fc_regs
, FC_PORT_STATUS_RETRY_INTERVAL_US
,
1094 FC_PORT_STATUS_RETRY_CNT
))
1095 pr_err("%s: wait on port %d to go online timed out\n",
1098 /* switch back to include this port */
1099 port_sel
|= (1ULL << port
);
1100 writeq_be(port_sel
, &afu
->afu_map
->global
.regs
.afu_port_sel
);
1101 cxlflash_afu_sync(afu
, 0, 0, AFU_GSYNC
);
1103 pr_debug("%s: returning port_sel=%lld\n", __func__
, port_sel
);
1107 * Asynchronous interrupt information table
1109 static const struct asyc_intr_info ainfo
[] = {
1110 {SISL_ASTATUS_FC0_OTHER
, "other error", 0, CLR_FC_ERROR
| LINK_RESET
},
1111 {SISL_ASTATUS_FC0_LOGO
, "target initiated LOGO", 0, 0},
1112 {SISL_ASTATUS_FC0_CRC_T
, "CRC threshold exceeded", 0, LINK_RESET
},
1113 {SISL_ASTATUS_FC0_LOGI_R
, "login timed out, retrying", 0, 0},
1114 {SISL_ASTATUS_FC0_LOGI_F
, "login failed", 0, CLR_FC_ERROR
},
1115 {SISL_ASTATUS_FC0_LOGI_S
, "login succeeded", 0, SCAN_HOST
},
1116 {SISL_ASTATUS_FC0_LINK_DN
, "link down", 0, 0},
1117 {SISL_ASTATUS_FC0_LINK_UP
, "link up", 0, SCAN_HOST
},
1118 {SISL_ASTATUS_FC1_OTHER
, "other error", 1, CLR_FC_ERROR
| LINK_RESET
},
1119 {SISL_ASTATUS_FC1_LOGO
, "target initiated LOGO", 1, 0},
1120 {SISL_ASTATUS_FC1_CRC_T
, "CRC threshold exceeded", 1, LINK_RESET
},
1121 {SISL_ASTATUS_FC1_LOGI_R
, "login timed out, retrying", 1, 0},
1122 {SISL_ASTATUS_FC1_LOGI_F
, "login failed", 1, CLR_FC_ERROR
},
1123 {SISL_ASTATUS_FC1_LOGI_S
, "login succeeded", 1, SCAN_HOST
},
1124 {SISL_ASTATUS_FC1_LINK_DN
, "link down", 1, 0},
1125 {SISL_ASTATUS_FC1_LINK_UP
, "link up", 1, SCAN_HOST
},
1126 {0x0, "", 0, 0} /* terminator */
1130 * find_ainfo() - locates and returns asynchronous interrupt information
1131 * @status: Status code set by AFU on error.
1133 * Return: The located information or NULL when the status code is invalid.
1135 static const struct asyc_intr_info
*find_ainfo(u64 status
)
1137 const struct asyc_intr_info
*info
;
1139 for (info
= &ainfo
[0]; info
->status
; info
++)
1140 if (info
->status
== status
)
1147 * afu_err_intr_init() - clears and initializes the AFU for error interrupts
1148 * @afu: AFU associated with the host.
1150 static void afu_err_intr_init(struct afu
*afu
)
1155 /* global async interrupts: AFU clears afu_ctrl on context exit
1156 * if async interrupts were sent to that context. This prevents
1157 * the AFU form sending further async interrupts when
1159 * nobody to receive them.
1163 writeq_be(-1ULL, &afu
->afu_map
->global
.regs
.aintr_mask
);
1164 /* set LISN# to send and point to master context */
1165 reg
= ((u64
) (((afu
->ctx_hndl
<< 8) | SISL_MSI_ASYNC_ERROR
)) << 40);
1167 if (afu
->internal_lun
)
1168 reg
|= 1; /* Bit 63 indicates local lun */
1169 writeq_be(reg
, &afu
->afu_map
->global
.regs
.afu_ctrl
);
1171 writeq_be(-1ULL, &afu
->afu_map
->global
.regs
.aintr_clear
);
1172 /* unmask bits that are of interest */
1173 /* note: afu can send an interrupt after this step */
1174 writeq_be(SISL_ASTATUS_MASK
, &afu
->afu_map
->global
.regs
.aintr_mask
);
1175 /* clear again in case a bit came on after previous clear but before */
1177 writeq_be(-1ULL, &afu
->afu_map
->global
.regs
.aintr_clear
);
1179 /* Clear/Set internal lun bits */
1180 reg
= readq_be(&afu
->afu_map
->global
.fc_regs
[0][FC_CONFIG2
/ 8]);
1181 reg
&= SISL_FC_INTERNAL_MASK
;
1182 if (afu
->internal_lun
)
1183 reg
|= ((u64
)(afu
->internal_lun
- 1) << SISL_FC_INTERNAL_SHIFT
);
1184 writeq_be(reg
, &afu
->afu_map
->global
.fc_regs
[0][FC_CONFIG2
/ 8]);
1186 /* now clear FC errors */
1187 for (i
= 0; i
< NUM_FC_PORTS
; i
++) {
1188 writeq_be(0xFFFFFFFFU
,
1189 &afu
->afu_map
->global
.fc_regs
[i
][FC_ERROR
/ 8]);
1190 writeq_be(0, &afu
->afu_map
->global
.fc_regs
[i
][FC_ERRCAP
/ 8]);
1193 /* sync interrupts for master's IOARRIN write */
1194 /* note that unlike asyncs, there can be no pending sync interrupts */
1195 /* at this time (this is a fresh context and master has not written */
1196 /* IOARRIN yet), so there is nothing to clear. */
1198 /* set LISN#, it is always sent to the context that wrote IOARRIN */
1199 writeq_be(SISL_MSI_SYNC_ERROR
, &afu
->host_map
->ctx_ctrl
);
1200 writeq_be(SISL_ISTATUS_MASK
, &afu
->host_map
->intr_mask
);
1204 * cxlflash_sync_err_irq() - interrupt handler for synchronous errors
1205 * @irq: Interrupt number.
1206 * @data: Private data provided at interrupt registration, the AFU.
1208 * Return: Always return IRQ_HANDLED.
1210 static irqreturn_t
cxlflash_sync_err_irq(int irq
, void *data
)
1212 struct afu
*afu
= (struct afu
*)data
;
1216 reg
= readq_be(&afu
->host_map
->intr_status
);
1217 reg_unmasked
= (reg
& SISL_ISTATUS_UNMASK
);
1219 if (reg_unmasked
== 0UL) {
1220 pr_err("%s: %llX: spurious interrupt, intr_status %016llX\n",
1221 __func__
, (u64
)afu
, reg
);
1222 goto cxlflash_sync_err_irq_exit
;
1225 pr_err("%s: %llX: unexpected interrupt, intr_status %016llX\n",
1226 __func__
, (u64
)afu
, reg
);
1228 writeq_be(reg_unmasked
, &afu
->host_map
->intr_clear
);
1230 cxlflash_sync_err_irq_exit
:
1231 pr_debug("%s: returning rc=%d\n", __func__
, IRQ_HANDLED
);
1236 * cxlflash_rrq_irq() - interrupt handler for read-response queue (normal path)
1237 * @irq: Interrupt number.
1238 * @data: Private data provided at interrupt registration, the AFU.
1240 * Return: Always return IRQ_HANDLED.
1242 static irqreturn_t
cxlflash_rrq_irq(int irq
, void *data
)
1244 struct afu
*afu
= (struct afu
*)data
;
1245 struct afu_cmd
*cmd
;
1246 bool toggle
= afu
->toggle
;
1248 *hrrq_start
= afu
->hrrq_start
,
1249 *hrrq_end
= afu
->hrrq_end
,
1250 *hrrq_curr
= afu
->hrrq_curr
;
1252 /* Process however many RRQ entries that are ready */
1256 if ((entry
& SISL_RESP_HANDLE_T_BIT
) != toggle
)
1259 cmd
= (struct afu_cmd
*)(entry
& ~SISL_RESP_HANDLE_T_BIT
);
1262 /* Advance to next entry or wrap and flip the toggle bit */
1263 if (hrrq_curr
< hrrq_end
)
1266 hrrq_curr
= hrrq_start
;
1267 toggle
^= SISL_RESP_HANDLE_T_BIT
;
1271 afu
->hrrq_curr
= hrrq_curr
;
1272 afu
->toggle
= toggle
;
1278 * cxlflash_async_err_irq() - interrupt handler for asynchronous errors
1279 * @irq: Interrupt number.
1280 * @data: Private data provided at interrupt registration, the AFU.
1282 * Return: Always return IRQ_HANDLED.
1284 static irqreturn_t
cxlflash_async_err_irq(int irq
, void *data
)
1286 struct afu
*afu
= (struct afu
*)data
;
1287 struct cxlflash_cfg
*cfg
= afu
->parent
;
1288 struct device
*dev
= &cfg
->dev
->dev
;
1290 const struct asyc_intr_info
*info
;
1291 struct sisl_global_map
*global
= &afu
->afu_map
->global
;
1296 reg
= readq_be(&global
->regs
.aintr_status
);
1297 reg_unmasked
= (reg
& SISL_ASTATUS_UNMASK
);
1299 if (reg_unmasked
== 0) {
1300 dev_err(dev
, "%s: spurious interrupt, aintr_status 0x%016llX\n",
1305 /* it is OK to clear AFU status before FC_ERROR */
1306 writeq_be(reg_unmasked
, &global
->regs
.aintr_clear
);
1308 /* check each bit that is on */
1309 for (i
= 0; reg_unmasked
; i
++, reg_unmasked
= (reg_unmasked
>> 1)) {
1310 info
= find_ainfo(1ULL << i
);
1311 if (((reg_unmasked
& 0x1) == 0) || !info
)
1316 dev_err(dev
, "%s: FC Port %d -> %s, fc_status 0x%08llX\n",
1317 __func__
, port
, info
->desc
,
1318 readq_be(&global
->fc_regs
[port
][FC_STATUS
/ 8]));
1321 * do link reset first, some OTHER errors will set FC_ERROR
1322 * again if cleared before or w/o a reset
1324 if (info
->action
& LINK_RESET
) {
1325 dev_err(dev
, "%s: FC Port %d: resetting link\n",
1327 cfg
->lr_state
= LINK_RESET_REQUIRED
;
1328 cfg
->lr_port
= port
;
1329 schedule_work(&cfg
->work_q
);
1332 if (info
->action
& CLR_FC_ERROR
) {
1333 reg
= readq_be(&global
->fc_regs
[port
][FC_ERROR
/ 8]);
1336 * since all errors are unmasked, FC_ERROR and FC_ERRCAP
1337 * should be the same and tracing one is sufficient.
1340 dev_err(dev
, "%s: fc %d: clearing fc_error 0x%08llX\n",
1341 __func__
, port
, reg
);
1343 writeq_be(reg
, &global
->fc_regs
[port
][FC_ERROR
/ 8]);
1344 writeq_be(0, &global
->fc_regs
[port
][FC_ERRCAP
/ 8]);
1347 if (info
->action
& SCAN_HOST
) {
1348 atomic_inc(&cfg
->scan_host_needed
);
1349 schedule_work(&cfg
->work_q
);
1354 dev_dbg(dev
, "%s: returning IRQ_HANDLED, afu=%p\n", __func__
, afu
);
1359 * start_context() - starts the master context
1360 * @cxlflash: Internal structure associated with the host.
1362 * Return: A success or failure value from CXL services.
1364 static int start_context(struct cxlflash_cfg
*cfg
)
1368 rc
= cxl_start_context(cfg
->mcctx
,
1369 cfg
->afu
->work
.work_element_descriptor
,
1372 pr_debug("%s: returning rc=%d\n", __func__
, rc
);
1377 * read_vpd() - obtains the WWPNs from VPD
1378 * @cxlflash: Internal structure associated with the host.
1379 * @wwpn: Array of size NUM_FC_PORTS to pass back WWPNs
1383 * -ENODEV when VPD or WWPN keywords not found
1385 static int read_vpd(struct cxlflash_cfg
*cfg
, u64 wwpn
[])
1387 struct pci_dev
*dev
= cfg
->parent_dev
;
1389 int ro_start
, ro_size
, i
, j
, k
;
1391 char vpd_data
[CXLFLASH_VPD_LEN
];
1392 char tmp_buf
[WWPN_BUF_LEN
] = { 0 };
1393 char *wwpn_vpd_tags
[NUM_FC_PORTS
] = { "V5", "V6" };
1395 /* Get the VPD data from the device */
1396 vpd_size
= pci_read_vpd(dev
, 0, sizeof(vpd_data
), vpd_data
);
1397 if (unlikely(vpd_size
<= 0)) {
1398 dev_err(&dev
->dev
, "%s: Unable to read VPD (size = %ld)\n",
1399 __func__
, vpd_size
);
1404 /* Get the read only section offset */
1405 ro_start
= pci_vpd_find_tag(vpd_data
, 0, vpd_size
,
1406 PCI_VPD_LRDT_RO_DATA
);
1407 if (unlikely(ro_start
< 0)) {
1408 dev_err(&dev
->dev
, "%s: VPD Read-only data not found\n",
1414 /* Get the read only section size, cap when extends beyond read VPD */
1415 ro_size
= pci_vpd_lrdt_size(&vpd_data
[ro_start
]);
1417 i
= ro_start
+ PCI_VPD_LRDT_TAG_SIZE
;
1418 if (unlikely((i
+ j
) > vpd_size
)) {
1419 pr_debug("%s: Might need to read more VPD (%d > %ld)\n",
1420 __func__
, (i
+ j
), vpd_size
);
1421 ro_size
= vpd_size
- i
;
1425 * Find the offset of the WWPN tag within the read only
1426 * VPD data and validate the found field (partials are
1427 * no good to us). Convert the ASCII data to an integer
1428 * value. Note that we must copy to a temporary buffer
1429 * because the conversion service requires that the ASCII
1430 * string be terminated.
1432 for (k
= 0; k
< NUM_FC_PORTS
; k
++) {
1434 i
= ro_start
+ PCI_VPD_LRDT_TAG_SIZE
;
1436 i
= pci_vpd_find_info_keyword(vpd_data
, i
, j
, wwpn_vpd_tags
[k
]);
1437 if (unlikely(i
< 0)) {
1438 dev_err(&dev
->dev
, "%s: Port %d WWPN not found "
1439 "in VPD\n", __func__
, k
);
1444 j
= pci_vpd_info_field_size(&vpd_data
[i
]);
1445 i
+= PCI_VPD_INFO_FLD_HDR_SIZE
;
1446 if (unlikely((i
+ j
> vpd_size
) || (j
!= WWPN_LEN
))) {
1447 dev_err(&dev
->dev
, "%s: Port %d WWPN incomplete or "
1454 memcpy(tmp_buf
, &vpd_data
[i
], WWPN_LEN
);
1455 rc
= kstrtoul(tmp_buf
, WWPN_LEN
, (ulong
*)&wwpn
[k
]);
1457 dev_err(&dev
->dev
, "%s: Fail to convert port %d WWPN "
1458 "to integer\n", __func__
, k
);
1465 pr_debug("%s: returning rc=%d\n", __func__
, rc
);
1470 * init_pcr() - initialize the provisioning and control registers
1471 * @cxlflash: Internal structure associated with the host.
1473 * Also sets up fast access to the mapped registers and initializes AFU
1474 * command fields that never change.
1476 static void init_pcr(struct cxlflash_cfg
*cfg
)
1478 struct afu
*afu
= cfg
->afu
;
1479 struct sisl_ctrl_map
*ctrl_map
;
1482 for (i
= 0; i
< MAX_CONTEXT
; i
++) {
1483 ctrl_map
= &afu
->afu_map
->ctrls
[i
].ctrl
;
1484 /* disrupt any clients that could be running */
1485 /* e. g. clients that survived a master restart */
1486 writeq_be(0, &ctrl_map
->rht_start
);
1487 writeq_be(0, &ctrl_map
->rht_cnt_id
);
1488 writeq_be(0, &ctrl_map
->ctx_cap
);
1491 /* copy frequently used fields into afu */
1492 afu
->ctx_hndl
= (u16
) cxl_process_element(cfg
->mcctx
);
1493 /* ctx_hndl is 16 bits in CAIA */
1494 afu
->host_map
= &afu
->afu_map
->hosts
[afu
->ctx_hndl
].host
;
1495 afu
->ctrl_map
= &afu
->afu_map
->ctrls
[afu
->ctx_hndl
].ctrl
;
1497 /* Program the Endian Control for the master context */
1498 writeq_be(SISL_ENDIAN_CTRL
, &afu
->host_map
->endian_ctrl
);
1500 /* initialize cmd fields that never change */
1501 for (i
= 0; i
< CXLFLASH_NUM_CMDS
; i
++) {
1502 afu
->cmd
[i
].rcb
.ctx_id
= afu
->ctx_hndl
;
1503 afu
->cmd
[i
].rcb
.msi
= SISL_MSI_RRQ_UPDATED
;
1504 afu
->cmd
[i
].rcb
.rrq
= 0x0;
1509 * init_global() - initialize AFU global registers
1510 * @cxlflash: Internal structure associated with the host.
1512 static int init_global(struct cxlflash_cfg
*cfg
)
1514 struct afu
*afu
= cfg
->afu
;
1515 struct device
*dev
= &cfg
->dev
->dev
;
1516 u64 wwpn
[NUM_FC_PORTS
]; /* wwpn of AFU ports */
1517 int i
= 0, num_ports
= 0;
1521 rc
= read_vpd(cfg
, &wwpn
[0]);
1523 dev_err(dev
, "%s: could not read vpd rc=%d\n", __func__
, rc
);
1527 pr_debug("%s: wwpn0=0x%llX wwpn1=0x%llX\n", __func__
, wwpn
[0], wwpn
[1]);
1529 /* set up RRQ in AFU for master issued cmds */
1530 writeq_be((u64
) afu
->hrrq_start
, &afu
->host_map
->rrq_start
);
1531 writeq_be((u64
) afu
->hrrq_end
, &afu
->host_map
->rrq_end
);
1533 /* AFU configuration */
1534 reg
= readq_be(&afu
->afu_map
->global
.regs
.afu_config
);
1535 reg
|= SISL_AFUCONF_AR_ALL
|SISL_AFUCONF_ENDIAN
;
1536 /* enable all auto retry options and control endianness */
1537 /* leave others at default: */
1538 /* CTX_CAP write protected, mbox_r does not clear on read and */
1539 /* checker on if dual afu */
1540 writeq_be(reg
, &afu
->afu_map
->global
.regs
.afu_config
);
1542 /* global port select: select either port */
1543 if (afu
->internal_lun
) {
1544 /* only use port 0 */
1545 writeq_be(PORT0
, &afu
->afu_map
->global
.regs
.afu_port_sel
);
1546 num_ports
= NUM_FC_PORTS
- 1;
1548 writeq_be(BOTH_PORTS
, &afu
->afu_map
->global
.regs
.afu_port_sel
);
1549 num_ports
= NUM_FC_PORTS
;
1552 for (i
= 0; i
< num_ports
; i
++) {
1553 /* unmask all errors (but they are still masked at AFU) */
1554 writeq_be(0, &afu
->afu_map
->global
.fc_regs
[i
][FC_ERRMSK
/ 8]);
1555 /* clear CRC error cnt & set a threshold */
1556 (void)readq_be(&afu
->afu_map
->global
.
1557 fc_regs
[i
][FC_CNT_CRCERR
/ 8]);
1558 writeq_be(MC_CRC_THRESH
, &afu
->afu_map
->global
.fc_regs
[i
]
1559 [FC_CRC_THRESH
/ 8]);
1561 /* set WWPNs. If already programmed, wwpn[i] is 0 */
1563 afu_set_wwpn(afu
, i
,
1564 &afu
->afu_map
->global
.fc_regs
[i
][0],
1566 dev_err(dev
, "%s: failed to set WWPN on port %d\n",
1571 /* Programming WWPN back to back causes additional
1572 * offline/online transitions and a PLOGI
1578 /* set up master's own CTX_CAP to allow real mode, host translation */
1579 /* tbls, afu cmds and read/write GSCSI cmds. */
1580 /* First, unlock ctx_cap write by reading mbox */
1581 (void)readq_be(&afu
->ctrl_map
->mbox_r
); /* unlock ctx_cap */
1582 writeq_be((SISL_CTX_CAP_REAL_MODE
| SISL_CTX_CAP_HOST_XLATE
|
1583 SISL_CTX_CAP_READ_CMD
| SISL_CTX_CAP_WRITE_CMD
|
1584 SISL_CTX_CAP_AFU_CMD
| SISL_CTX_CAP_GSCSI_CMD
),
1585 &afu
->ctrl_map
->ctx_cap
);
1586 /* init heartbeat */
1587 afu
->hb
= readq_be(&afu
->afu_map
->global
.regs
.afu_hb
);
1594 * start_afu() - initializes and starts the AFU
1595 * @cxlflash: Internal structure associated with the host.
1597 static int start_afu(struct cxlflash_cfg
*cfg
)
1599 struct afu
*afu
= cfg
->afu
;
1600 struct afu_cmd
*cmd
;
1605 for (i
= 0; i
< CXLFLASH_NUM_CMDS
; i
++) {
1608 init_completion(&cmd
->cevent
);
1609 spin_lock_init(&cmd
->slock
);
1615 /* initialize RRQ pointers */
1616 afu
->hrrq_start
= &afu
->rrq_entry
[0];
1617 afu
->hrrq_end
= &afu
->rrq_entry
[NUM_RRQ_ENTRY
- 1];
1618 afu
->hrrq_curr
= afu
->hrrq_start
;
1621 rc
= init_global(cfg
);
1623 pr_debug("%s: returning rc=%d\n", __func__
, rc
);
1628 * init_mc() - create and register as the master context
1629 * @cxlflash: Internal structure associated with the host.
1633 * -ENOMEM when unable to obtain a context from CXL services
1634 * A failure value from CXL services.
1636 static int init_mc(struct cxlflash_cfg
*cfg
)
1638 struct cxl_context
*ctx
;
1639 struct device
*dev
= &cfg
->dev
->dev
;
1640 struct afu
*afu
= cfg
->afu
;
1642 enum undo_level level
;
1644 ctx
= cxl_get_context(cfg
->dev
);
1649 /* Set it up as a master with the CXL */
1650 cxl_set_master(ctx
);
1652 /* During initialization reset the AFU to start from a clean slate */
1653 rc
= cxl_afu_reset(cfg
->mcctx
);
1655 dev_err(dev
, "%s: initial AFU reset failed rc=%d\n",
1657 level
= RELEASE_CONTEXT
;
1661 rc
= cxl_allocate_afu_irqs(ctx
, 3);
1663 dev_err(dev
, "%s: call to allocate_afu_irqs failed rc=%d!\n",
1665 level
= RELEASE_CONTEXT
;
1669 rc
= cxl_map_afu_irq(ctx
, 1, cxlflash_sync_err_irq
, afu
,
1670 "SISL_MSI_SYNC_ERROR");
1671 if (unlikely(rc
<= 0)) {
1672 dev_err(dev
, "%s: IRQ 1 (SISL_MSI_SYNC_ERROR) map failed!\n",
1678 rc
= cxl_map_afu_irq(ctx
, 2, cxlflash_rrq_irq
, afu
,
1679 "SISL_MSI_RRQ_UPDATED");
1680 if (unlikely(rc
<= 0)) {
1681 dev_err(dev
, "%s: IRQ 2 (SISL_MSI_RRQ_UPDATED) map failed!\n",
1687 rc
= cxl_map_afu_irq(ctx
, 3, cxlflash_async_err_irq
, afu
,
1688 "SISL_MSI_ASYNC_ERROR");
1689 if (unlikely(rc
<= 0)) {
1690 dev_err(dev
, "%s: IRQ 3 (SISL_MSI_ASYNC_ERROR) map failed!\n",
1698 /* This performs the equivalent of the CXL_IOCTL_START_WORK.
1699 * The CXL_IOCTL_GET_PROCESS_ELEMENT is implicit in the process
1700 * element (pe) that is embedded in the context (ctx)
1702 rc
= start_context(cfg
);
1704 dev_err(dev
, "%s: start context failed rc=%d\n", __func__
, rc
);
1705 level
= UNMAP_THREE
;
1709 pr_debug("%s: returning rc=%d\n", __func__
, rc
);
1712 term_mc(cfg
, level
);
1717 * init_afu() - setup as master context and start AFU
1718 * @cxlflash: Internal structure associated with the host.
1720 * This routine is a higher level of control for configuring the
1721 * AFU on probe and reset paths.
1725 * -ENOMEM when unable to map the AFU MMIO space
1726 * A failure value from internal services.
1728 static int init_afu(struct cxlflash_cfg
*cfg
)
1732 struct afu
*afu
= cfg
->afu
;
1733 struct device
*dev
= &cfg
->dev
->dev
;
1735 cxl_perst_reloads_same_image(cfg
->cxl_afu
, true);
1739 dev_err(dev
, "%s: call to init_mc failed, rc=%d!\n",
1744 /* Map the entire MMIO space of the AFU.
1746 afu
->afu_map
= cxl_psa_map(cfg
->mcctx
);
1747 if (!afu
->afu_map
) {
1749 term_mc(cfg
, UNDO_START
);
1750 dev_err(dev
, "%s: call to cxl_psa_map failed!\n", __func__
);
1754 /* No byte reverse on reading afu_version or string will be backwards */
1755 reg
= readq(&afu
->afu_map
->global
.regs
.afu_version
);
1756 memcpy(afu
->version
, ®
, sizeof(reg
));
1757 afu
->interface_version
=
1758 readq_be(&afu
->afu_map
->global
.regs
.interface_version
);
1759 if ((afu
->interface_version
+ 1) == 0) {
1760 pr_err("Back level AFU, please upgrade. AFU version %s "
1761 "interface version 0x%llx\n", afu
->version
,
1762 afu
->interface_version
);
1766 pr_debug("%s: afu version %s, interface version 0x%llX\n",
1767 __func__
, afu
->version
, afu
->interface_version
);
1769 rc
= start_afu(cfg
);
1771 dev_err(dev
, "%s: call to start_afu failed, rc=%d!\n",
1773 term_mc(cfg
, UNDO_START
);
1774 cxl_psa_unmap((void *)afu
->afu_map
);
1775 afu
->afu_map
= NULL
;
1779 afu_err_intr_init(cfg
->afu
);
1780 atomic64_set(&afu
->room
, readq_be(&afu
->host_map
->cmd_room
));
1782 /* Restore the LUN mappings */
1783 cxlflash_restore_luntable(cfg
);
1785 pr_debug("%s: returning rc=%d\n", __func__
, rc
);
1790 * cxlflash_afu_sync() - builds and sends an AFU sync command
1791 * @afu: AFU associated with the host.
1792 * @ctx_hndl_u: Identifies context requesting sync.
1793 * @res_hndl_u: Identifies resource requesting sync.
1794 * @mode: Type of sync to issue (lightweight, heavyweight, global).
1796 * The AFU can only take 1 sync command at a time. This routine enforces this
1797 * limitation by using a mutex to provide exlusive access to the AFU during
1798 * the sync. This design point requires calling threads to not be on interrupt
1799 * context due to the possibility of sleeping during concurrent sync operations.
1801 * AFU sync operations are only necessary and allowed when the device is
1802 * operating normally. When not operating normally, sync requests can occur as
1803 * part of cleaning up resources associated with an adapter prior to removal.
1804 * In this scenario, these requests are simply ignored (safe due to the AFU
1811 int cxlflash_afu_sync(struct afu
*afu
, ctx_hndl_t ctx_hndl_u
,
1812 res_hndl_t res_hndl_u
, u8 mode
)
1814 struct cxlflash_cfg
*cfg
= afu
->parent
;
1815 struct device
*dev
= &cfg
->dev
->dev
;
1816 struct afu_cmd
*cmd
= NULL
;
1819 static DEFINE_MUTEX(sync_active
);
1821 if (cfg
->state
!= STATE_NORMAL
) {
1822 pr_debug("%s: Sync not required! (%u)\n", __func__
, cfg
->state
);
1826 mutex_lock(&sync_active
);
1828 cmd
= cmd_checkout(afu
);
1829 if (unlikely(!cmd
)) {
1831 udelay(1000 * retry_cnt
);
1832 if (retry_cnt
< MC_RETRY_CNT
)
1834 dev_err(dev
, "%s: could not get a free command\n", __func__
);
1839 pr_debug("%s: afu=%p cmd=%p %d\n", __func__
, afu
, cmd
, ctx_hndl_u
);
1841 memset(cmd
->rcb
.cdb
, 0, sizeof(cmd
->rcb
.cdb
));
1843 cmd
->rcb
.req_flags
= SISL_REQ_FLAGS_AFU_CMD
;
1844 cmd
->rcb
.port_sel
= 0x0; /* NA */
1845 cmd
->rcb
.lun_id
= 0x0; /* NA */
1846 cmd
->rcb
.data_len
= 0x0;
1847 cmd
->rcb
.data_ea
= 0x0;
1848 cmd
->rcb
.timeout
= MC_AFU_SYNC_TIMEOUT
;
1850 cmd
->rcb
.cdb
[0] = 0xC0; /* AFU Sync */
1851 cmd
->rcb
.cdb
[1] = mode
;
1853 /* The cdb is aligned, no unaligned accessors required */
1854 *((u16
*)&cmd
->rcb
.cdb
[2]) = swab16(ctx_hndl_u
);
1855 *((u32
*)&cmd
->rcb
.cdb
[4]) = swab32(res_hndl_u
);
1857 rc
= send_cmd(afu
, cmd
);
1861 wait_resp(afu
, cmd
);
1863 /* set on timeout */
1864 if (unlikely((cmd
->sa
.ioasc
!= 0) ||
1865 (cmd
->sa
.host_use_b
[0] & B_ERROR
)))
1868 mutex_unlock(&sync_active
);
1871 pr_debug("%s: returning rc=%d\n", __func__
, rc
);
1876 * afu_reset() - resets the AFU
1877 * @cfg: Internal structure associated with the host.
1881 * A failure value from internal services.
1883 static int afu_reset(struct cxlflash_cfg
*cfg
)
1886 /* Stop the context before the reset. Since the context is
1887 * no longer available restart it after the reset is complete
1894 pr_debug("%s: returning rc=%d\n", __func__
, rc
);
1899 * cxlflash_eh_device_reset_handler() - reset a single LUN
1900 * @scp: SCSI command to send.
1903 * SUCCESS as defined in scsi/scsi.h
1904 * FAILED as defined in scsi/scsi.h
1906 static int cxlflash_eh_device_reset_handler(struct scsi_cmnd
*scp
)
1909 struct Scsi_Host
*host
= scp
->device
->host
;
1910 struct cxlflash_cfg
*cfg
= (struct cxlflash_cfg
*)host
->hostdata
;
1911 struct afu
*afu
= cfg
->afu
;
1914 pr_debug("%s: (scp=%p) %d/%d/%d/%llu "
1915 "cdb=(%08X-%08X-%08X-%08X)\n", __func__
, scp
,
1916 host
->host_no
, scp
->device
->channel
,
1917 scp
->device
->id
, scp
->device
->lun
,
1918 get_unaligned_be32(&((u32
*)scp
->cmnd
)[0]),
1919 get_unaligned_be32(&((u32
*)scp
->cmnd
)[1]),
1920 get_unaligned_be32(&((u32
*)scp
->cmnd
)[2]),
1921 get_unaligned_be32(&((u32
*)scp
->cmnd
)[3]));
1923 switch (cfg
->state
) {
1925 rcr
= send_tmf(afu
, scp
, TMF_LUN_RESET
);
1930 wait_event(cfg
->reset_waitq
, cfg
->state
!= STATE_RESET
);
1931 if (cfg
->state
== STATE_NORMAL
)
1939 pr_debug("%s: returning rc=%d\n", __func__
, rc
);
1944 * cxlflash_eh_host_reset_handler() - reset the host adapter
1945 * @scp: SCSI command from stack identifying host.
1948 * SUCCESS as defined in scsi/scsi.h
1949 * FAILED as defined in scsi/scsi.h
1951 static int cxlflash_eh_host_reset_handler(struct scsi_cmnd
*scp
)
1955 struct Scsi_Host
*host
= scp
->device
->host
;
1956 struct cxlflash_cfg
*cfg
= (struct cxlflash_cfg
*)host
->hostdata
;
1958 pr_debug("%s: (scp=%p) %d/%d/%d/%llu "
1959 "cdb=(%08X-%08X-%08X-%08X)\n", __func__
, scp
,
1960 host
->host_no
, scp
->device
->channel
,
1961 scp
->device
->id
, scp
->device
->lun
,
1962 get_unaligned_be32(&((u32
*)scp
->cmnd
)[0]),
1963 get_unaligned_be32(&((u32
*)scp
->cmnd
)[1]),
1964 get_unaligned_be32(&((u32
*)scp
->cmnd
)[2]),
1965 get_unaligned_be32(&((u32
*)scp
->cmnd
)[3]));
1967 switch (cfg
->state
) {
1969 cfg
->state
= STATE_RESET
;
1970 scsi_block_requests(cfg
->host
);
1971 cxlflash_mark_contexts_error(cfg
);
1972 rcr
= afu_reset(cfg
);
1975 cfg
->state
= STATE_FAILTERM
;
1977 cfg
->state
= STATE_NORMAL
;
1978 wake_up_all(&cfg
->reset_waitq
);
1979 scsi_unblock_requests(cfg
->host
);
1982 wait_event(cfg
->reset_waitq
, cfg
->state
!= STATE_RESET
);
1983 if (cfg
->state
== STATE_NORMAL
)
1991 pr_debug("%s: returning rc=%d\n", __func__
, rc
);
1996 * cxlflash_change_queue_depth() - change the queue depth for the device
1997 * @sdev: SCSI device destined for queue depth change.
1998 * @qdepth: Requested queue depth value to set.
2000 * The requested queue depth is capped to the maximum supported value.
2002 * Return: The actual queue depth set.
2004 static int cxlflash_change_queue_depth(struct scsi_device
*sdev
, int qdepth
)
2007 if (qdepth
> CXLFLASH_MAX_CMDS_PER_LUN
)
2008 qdepth
= CXLFLASH_MAX_CMDS_PER_LUN
;
2010 scsi_change_queue_depth(sdev
, qdepth
);
2011 return sdev
->queue_depth
;
2015 * cxlflash_show_port_status() - queries and presents the current port status
2016 * @port: Desired port for status reporting.
2017 * @afu: AFU owning the specified port.
2018 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
2020 * Return: The size of the ASCII string returned in @buf.
2022 static ssize_t
cxlflash_show_port_status(u32 port
, struct afu
*afu
, char *buf
)
2026 __be64 __iomem
*fc_regs
;
2028 if (port
>= NUM_FC_PORTS
)
2031 fc_regs
= &afu
->afu_map
->global
.fc_regs
[port
][0];
2032 status
= readq_be(&fc_regs
[FC_MTIP_STATUS
/ 8]);
2033 status
&= FC_MTIP_STATUS_MASK
;
2035 if (status
== FC_MTIP_STATUS_ONLINE
)
2036 disp_status
= "online";
2037 else if (status
== FC_MTIP_STATUS_OFFLINE
)
2038 disp_status
= "offline";
2040 disp_status
= "unknown";
2042 return scnprintf(buf
, PAGE_SIZE
, "%s\n", disp_status
);
2046 * port0_show() - queries and presents the current status of port 0
2047 * @dev: Generic device associated with the host owning the port.
2048 * @attr: Device attribute representing the port.
2049 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
2051 * Return: The size of the ASCII string returned in @buf.
2053 static ssize_t
port0_show(struct device
*dev
,
2054 struct device_attribute
*attr
,
2057 struct Scsi_Host
*shost
= class_to_shost(dev
);
2058 struct cxlflash_cfg
*cfg
= (struct cxlflash_cfg
*)shost
->hostdata
;
2059 struct afu
*afu
= cfg
->afu
;
2061 return cxlflash_show_port_status(0, afu
, buf
);
2065 * port1_show() - queries and presents the current status of port 1
2066 * @dev: Generic device associated with the host owning the port.
2067 * @attr: Device attribute representing the port.
2068 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
2070 * Return: The size of the ASCII string returned in @buf.
2072 static ssize_t
port1_show(struct device
*dev
,
2073 struct device_attribute
*attr
,
2076 struct Scsi_Host
*shost
= class_to_shost(dev
);
2077 struct cxlflash_cfg
*cfg
= (struct cxlflash_cfg
*)shost
->hostdata
;
2078 struct afu
*afu
= cfg
->afu
;
2080 return cxlflash_show_port_status(1, afu
, buf
);
2084 * lun_mode_show() - presents the current LUN mode of the host
2085 * @dev: Generic device associated with the host.
2086 * @attr: Device attribute representing the LUN mode.
2087 * @buf: Buffer of length PAGE_SIZE to report back the LUN mode in ASCII.
2089 * Return: The size of the ASCII string returned in @buf.
2091 static ssize_t
lun_mode_show(struct device
*dev
,
2092 struct device_attribute
*attr
, char *buf
)
2094 struct Scsi_Host
*shost
= class_to_shost(dev
);
2095 struct cxlflash_cfg
*cfg
= (struct cxlflash_cfg
*)shost
->hostdata
;
2096 struct afu
*afu
= cfg
->afu
;
2098 return scnprintf(buf
, PAGE_SIZE
, "%u\n", afu
->internal_lun
);
2102 * lun_mode_store() - sets the LUN mode of the host
2103 * @dev: Generic device associated with the host.
2104 * @attr: Device attribute representing the LUN mode.
2105 * @buf: Buffer of length PAGE_SIZE containing the LUN mode in ASCII.
2106 * @count: Length of data resizing in @buf.
2108 * The CXL Flash AFU supports a dummy LUN mode where the external
2109 * links and storage are not required. Space on the FPGA is used
2110 * to create 1 or 2 small LUNs which are presented to the system
2111 * as if they were a normal storage device. This feature is useful
2112 * during development and also provides manufacturing with a way
2113 * to test the AFU without an actual device.
2115 * 0 = external LUN[s] (default)
2116 * 1 = internal LUN (1 x 64K, 512B blocks, id 0)
2117 * 2 = internal LUN (1 x 64K, 4K blocks, id 0)
2118 * 3 = internal LUN (2 x 32K, 512B blocks, ids 0,1)
2119 * 4 = internal LUN (2 x 32K, 4K blocks, ids 0,1)
2121 * Return: The size of the ASCII string returned in @buf.
2123 static ssize_t
lun_mode_store(struct device
*dev
,
2124 struct device_attribute
*attr
,
2125 const char *buf
, size_t count
)
2127 struct Scsi_Host
*shost
= class_to_shost(dev
);
2128 struct cxlflash_cfg
*cfg
= (struct cxlflash_cfg
*)shost
->hostdata
;
2129 struct afu
*afu
= cfg
->afu
;
2133 rc
= kstrtouint(buf
, 10, &lun_mode
);
2134 if (!rc
&& (lun_mode
< 5) && (lun_mode
!= afu
->internal_lun
)) {
2135 afu
->internal_lun
= lun_mode
;
2137 scsi_scan_host(cfg
->host
);
2144 * ioctl_version_show() - presents the current ioctl version of the host
2145 * @dev: Generic device associated with the host.
2146 * @attr: Device attribute representing the ioctl version.
2147 * @buf: Buffer of length PAGE_SIZE to report back the ioctl version.
2149 * Return: The size of the ASCII string returned in @buf.
2151 static ssize_t
ioctl_version_show(struct device
*dev
,
2152 struct device_attribute
*attr
, char *buf
)
2154 return scnprintf(buf
, PAGE_SIZE
, "%u\n", DK_CXLFLASH_VERSION_0
);
2158 * cxlflash_show_port_lun_table() - queries and presents the port LUN table
2159 * @port: Desired port for status reporting.
2160 * @afu: AFU owning the specified port.
2161 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
2163 * Return: The size of the ASCII string returned in @buf.
2165 static ssize_t
cxlflash_show_port_lun_table(u32 port
,
2171 __be64 __iomem
*fc_port
;
2173 if (port
>= NUM_FC_PORTS
)
2176 fc_port
= &afu
->afu_map
->global
.fc_port
[port
][0];
2178 for (i
= 0; i
< CXLFLASH_NUM_VLUNS
; i
++)
2179 bytes
+= scnprintf(buf
+ bytes
, PAGE_SIZE
- bytes
,
2180 "%03d: %016llX\n", i
, readq_be(&fc_port
[i
]));
2185 * port0_lun_table_show() - presents the current LUN table of port 0
2186 * @dev: Generic device associated with the host owning the port.
2187 * @attr: Device attribute representing the port.
2188 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
2190 * Return: The size of the ASCII string returned in @buf.
2192 static ssize_t
port0_lun_table_show(struct device
*dev
,
2193 struct device_attribute
*attr
,
2196 struct Scsi_Host
*shost
= class_to_shost(dev
);
2197 struct cxlflash_cfg
*cfg
= (struct cxlflash_cfg
*)shost
->hostdata
;
2198 struct afu
*afu
= cfg
->afu
;
2200 return cxlflash_show_port_lun_table(0, afu
, buf
);
2204 * port1_lun_table_show() - presents the current LUN table of port 1
2205 * @dev: Generic device associated with the host owning the port.
2206 * @attr: Device attribute representing the port.
2207 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
2209 * Return: The size of the ASCII string returned in @buf.
2211 static ssize_t
port1_lun_table_show(struct device
*dev
,
2212 struct device_attribute
*attr
,
2215 struct Scsi_Host
*shost
= class_to_shost(dev
);
2216 struct cxlflash_cfg
*cfg
= (struct cxlflash_cfg
*)shost
->hostdata
;
2217 struct afu
*afu
= cfg
->afu
;
2219 return cxlflash_show_port_lun_table(1, afu
, buf
);
2223 * mode_show() - presents the current mode of the device
2224 * @dev: Generic device associated with the device.
2225 * @attr: Device attribute representing the device mode.
2226 * @buf: Buffer of length PAGE_SIZE to report back the dev mode in ASCII.
2228 * Return: The size of the ASCII string returned in @buf.
2230 static ssize_t
mode_show(struct device
*dev
,
2231 struct device_attribute
*attr
, char *buf
)
2233 struct scsi_device
*sdev
= to_scsi_device(dev
);
2235 return scnprintf(buf
, PAGE_SIZE
, "%s\n",
2236 sdev
->hostdata
? "superpipe" : "legacy");
2242 static DEVICE_ATTR_RO(port0
);
2243 static DEVICE_ATTR_RO(port1
);
2244 static DEVICE_ATTR_RW(lun_mode
);
2245 static DEVICE_ATTR_RO(ioctl_version
);
2246 static DEVICE_ATTR_RO(port0_lun_table
);
2247 static DEVICE_ATTR_RO(port1_lun_table
);
2249 static struct device_attribute
*cxlflash_host_attrs
[] = {
2253 &dev_attr_ioctl_version
,
2254 &dev_attr_port0_lun_table
,
2255 &dev_attr_port1_lun_table
,
2262 static DEVICE_ATTR_RO(mode
);
2264 static struct device_attribute
*cxlflash_dev_attrs
[] = {
2272 static struct scsi_host_template driver_template
= {
2273 .module
= THIS_MODULE
,
2274 .name
= CXLFLASH_ADAPTER_NAME
,
2275 .info
= cxlflash_driver_info
,
2276 .ioctl
= cxlflash_ioctl
,
2277 .proc_name
= CXLFLASH_NAME
,
2278 .queuecommand
= cxlflash_queuecommand
,
2279 .eh_device_reset_handler
= cxlflash_eh_device_reset_handler
,
2280 .eh_host_reset_handler
= cxlflash_eh_host_reset_handler
,
2281 .change_queue_depth
= cxlflash_change_queue_depth
,
2283 .can_queue
= CXLFLASH_MAX_CMDS
,
2285 .sg_tablesize
= SG_NONE
, /* No scatter gather support. */
2286 .max_sectors
= CXLFLASH_MAX_SECTORS
,
2287 .use_clustering
= ENABLE_CLUSTERING
,
2288 .shost_attrs
= cxlflash_host_attrs
,
2289 .sdev_attrs
= cxlflash_dev_attrs
,
2293 * Device dependent values
2295 static struct dev_dependent_vals dev_corsa_vals
= { CXLFLASH_MAX_SECTORS
};
2298 * PCI device binding table
2300 static struct pci_device_id cxlflash_pci_table
[] = {
2301 {PCI_VENDOR_ID_IBM
, PCI_DEVICE_ID_IBM_CORSA
,
2302 PCI_ANY_ID
, PCI_ANY_ID
, 0, 0, (kernel_ulong_t
)&dev_corsa_vals
},
2306 MODULE_DEVICE_TABLE(pci
, cxlflash_pci_table
);
2309 * cxlflash_worker_thread() - work thread handler for the AFU
2310 * @work: Work structure contained within cxlflash associated with host.
2312 * Handles the following events:
2313 * - Link reset which cannot be performed on interrupt context due to
2314 * blocking up to a few seconds
2315 * - Read AFU command room
2318 static void cxlflash_worker_thread(struct work_struct
*work
)
2320 struct cxlflash_cfg
*cfg
= container_of(work
, struct cxlflash_cfg
,
2322 struct afu
*afu
= cfg
->afu
;
2323 struct device
*dev
= &cfg
->dev
->dev
;
2327 /* Avoid MMIO if the device has failed */
2329 if (cfg
->state
!= STATE_NORMAL
)
2332 spin_lock_irqsave(cfg
->host
->host_lock
, lock_flags
);
2334 if (cfg
->lr_state
== LINK_RESET_REQUIRED
) {
2335 port
= cfg
->lr_port
;
2337 dev_err(dev
, "%s: invalid port index %d\n",
2340 spin_unlock_irqrestore(cfg
->host
->host_lock
,
2343 /* The reset can block... */
2344 afu_link_reset(afu
, port
,
2346 global
.fc_regs
[port
][0]);
2347 spin_lock_irqsave(cfg
->host
->host_lock
, lock_flags
);
2350 cfg
->lr_state
= LINK_RESET_COMPLETE
;
2353 if (afu
->read_room
) {
2354 atomic64_set(&afu
->room
, readq_be(&afu
->host_map
->cmd_room
));
2355 afu
->read_room
= false;
2358 spin_unlock_irqrestore(cfg
->host
->host_lock
, lock_flags
);
2360 if (atomic_dec_if_positive(&cfg
->scan_host_needed
) >= 0)
2361 scsi_scan_host(cfg
->host
);
2365 * cxlflash_probe() - PCI entry point to add host
2366 * @pdev: PCI device associated with the host.
2367 * @dev_id: PCI device id associated with device.
2369 * Return: 0 on success / non-zero on failure
2371 static int cxlflash_probe(struct pci_dev
*pdev
,
2372 const struct pci_device_id
*dev_id
)
2374 struct Scsi_Host
*host
;
2375 struct cxlflash_cfg
*cfg
= NULL
;
2376 struct device
*phys_dev
;
2377 struct dev_dependent_vals
*ddv
;
2380 dev_dbg(&pdev
->dev
, "%s: Found CXLFLASH with IRQ: %d\n",
2381 __func__
, pdev
->irq
);
2383 ddv
= (struct dev_dependent_vals
*)dev_id
->driver_data
;
2384 driver_template
.max_sectors
= ddv
->max_sectors
;
2386 host
= scsi_host_alloc(&driver_template
, sizeof(struct cxlflash_cfg
));
2388 dev_err(&pdev
->dev
, "%s: call to scsi_host_alloc failed!\n",
2394 host
->max_id
= CXLFLASH_MAX_NUM_TARGETS_PER_BUS
;
2395 host
->max_lun
= CXLFLASH_MAX_NUM_LUNS_PER_TARGET
;
2396 host
->max_channel
= NUM_FC_PORTS
- 1;
2397 host
->unique_id
= host
->host_no
;
2398 host
->max_cmd_len
= CXLFLASH_MAX_CDB_LEN
;
2400 cfg
= (struct cxlflash_cfg
*)host
->hostdata
;
2402 rc
= alloc_mem(cfg
);
2404 dev_err(&pdev
->dev
, "%s: call to scsi_host_alloc failed!\n",
2407 scsi_host_put(cfg
->host
);
2411 cfg
->init_state
= INIT_STATE_NONE
;
2415 * The promoted LUNs move to the top of the LUN table. The rest stay
2416 * on the bottom half. The bottom half grows from the end
2417 * (index = 255), whereas the top half grows from the beginning
2420 cfg
->promote_lun_index
= 0;
2421 cfg
->last_lun_index
[0] = CXLFLASH_NUM_VLUNS
/2 - 1;
2422 cfg
->last_lun_index
[1] = CXLFLASH_NUM_VLUNS
/2 - 1;
2424 cfg
->dev_id
= (struct pci_device_id
*)dev_id
;
2427 init_waitqueue_head(&cfg
->tmf_waitq
);
2428 init_waitqueue_head(&cfg
->reset_waitq
);
2430 INIT_WORK(&cfg
->work_q
, cxlflash_worker_thread
);
2431 cfg
->lr_state
= LINK_RESET_INVALID
;
2433 mutex_init(&cfg
->ctx_tbl_list_mutex
);
2434 mutex_init(&cfg
->ctx_recovery_mutex
);
2435 init_rwsem(&cfg
->ioctl_rwsem
);
2436 INIT_LIST_HEAD(&cfg
->ctx_err_recovery
);
2437 INIT_LIST_HEAD(&cfg
->lluns
);
2439 pci_set_drvdata(pdev
, cfg
);
2441 /* Use the special service provided to look up the physical
2442 * PCI device, since we are called on the probe of the virtual
2443 * PCI host bus (vphb)
2445 phys_dev
= cxl_get_phys_dev(pdev
);
2446 if (!dev_is_pci(phys_dev
)) {
2447 dev_err(&pdev
->dev
, "%s: not a pci dev\n", __func__
);
2451 cfg
->parent_dev
= to_pci_dev(phys_dev
);
2453 cfg
->cxl_afu
= cxl_pci_to_afu(pdev
);
2457 dev_err(&pdev
->dev
, "%s: call to init_pci "
2458 "failed rc=%d!\n", __func__
, rc
);
2461 cfg
->init_state
= INIT_STATE_PCI
;
2465 dev_err(&pdev
->dev
, "%s: call to init_afu "
2466 "failed rc=%d!\n", __func__
, rc
);
2469 cfg
->init_state
= INIT_STATE_AFU
;
2472 rc
= init_scsi(cfg
);
2474 dev_err(&pdev
->dev
, "%s: call to init_scsi "
2475 "failed rc=%d!\n", __func__
, rc
);
2478 cfg
->init_state
= INIT_STATE_SCSI
;
2481 pr_debug("%s: returning rc=%d\n", __func__
, rc
);
2485 cxlflash_remove(pdev
);
2490 * drain_ioctls() - wait until all currently executing ioctls have completed
2491 * @cfg: Internal structure associated with the host.
2493 * Obtain write access to read/write semaphore that wraps ioctl
2494 * handling to 'drain' ioctls currently executing.
2496 static void drain_ioctls(struct cxlflash_cfg
*cfg
)
2498 down_write(&cfg
->ioctl_rwsem
);
2499 up_write(&cfg
->ioctl_rwsem
);
2503 * cxlflash_pci_error_detected() - called when a PCI error is detected
2504 * @pdev: PCI device struct.
2505 * @state: PCI channel state.
2507 * Return: PCI_ERS_RESULT_NEED_RESET or PCI_ERS_RESULT_DISCONNECT
2509 static pci_ers_result_t
cxlflash_pci_error_detected(struct pci_dev
*pdev
,
2510 pci_channel_state_t state
)
2513 struct cxlflash_cfg
*cfg
= pci_get_drvdata(pdev
);
2514 struct device
*dev
= &cfg
->dev
->dev
;
2516 dev_dbg(dev
, "%s: pdev=%p state=%u\n", __func__
, pdev
, state
);
2519 case pci_channel_io_frozen
:
2520 cfg
->state
= STATE_RESET
;
2521 scsi_block_requests(cfg
->host
);
2523 rc
= cxlflash_mark_contexts_error(cfg
);
2525 dev_err(dev
, "%s: Failed to mark user contexts!(%d)\n",
2527 term_mc(cfg
, UNDO_START
);
2529 return PCI_ERS_RESULT_NEED_RESET
;
2530 case pci_channel_io_perm_failure
:
2531 cfg
->state
= STATE_FAILTERM
;
2532 wake_up_all(&cfg
->reset_waitq
);
2533 scsi_unblock_requests(cfg
->host
);
2534 return PCI_ERS_RESULT_DISCONNECT
;
2538 return PCI_ERS_RESULT_NEED_RESET
;
2542 * cxlflash_pci_slot_reset() - called when PCI slot has been reset
2543 * @pdev: PCI device struct.
2545 * This routine is called by the pci error recovery code after the PCI
2546 * slot has been reset, just before we should resume normal operations.
2548 * Return: PCI_ERS_RESULT_RECOVERED or PCI_ERS_RESULT_DISCONNECT
2550 static pci_ers_result_t
cxlflash_pci_slot_reset(struct pci_dev
*pdev
)
2553 struct cxlflash_cfg
*cfg
= pci_get_drvdata(pdev
);
2554 struct device
*dev
= &cfg
->dev
->dev
;
2556 dev_dbg(dev
, "%s: pdev=%p\n", __func__
, pdev
);
2560 dev_err(dev
, "%s: EEH recovery failed! (%d)\n", __func__
, rc
);
2561 return PCI_ERS_RESULT_DISCONNECT
;
2564 return PCI_ERS_RESULT_RECOVERED
;
2568 * cxlflash_pci_resume() - called when normal operation can resume
2569 * @pdev: PCI device struct
2571 static void cxlflash_pci_resume(struct pci_dev
*pdev
)
2573 struct cxlflash_cfg
*cfg
= pci_get_drvdata(pdev
);
2574 struct device
*dev
= &cfg
->dev
->dev
;
2576 dev_dbg(dev
, "%s: pdev=%p\n", __func__
, pdev
);
2578 cfg
->state
= STATE_NORMAL
;
2579 wake_up_all(&cfg
->reset_waitq
);
2580 scsi_unblock_requests(cfg
->host
);
2583 static const struct pci_error_handlers cxlflash_err_handler
= {
2584 .error_detected
= cxlflash_pci_error_detected
,
2585 .slot_reset
= cxlflash_pci_slot_reset
,
2586 .resume
= cxlflash_pci_resume
,
2590 * PCI device structure
2592 static struct pci_driver cxlflash_driver
= {
2593 .name
= CXLFLASH_NAME
,
2594 .id_table
= cxlflash_pci_table
,
2595 .probe
= cxlflash_probe
,
2596 .remove
= cxlflash_remove
,
2597 .err_handler
= &cxlflash_err_handler
,
2601 * init_cxlflash() - module entry point
2603 * Return: 0 on success / non-zero on failure
2605 static int __init
init_cxlflash(void)
2607 pr_info("%s: IBM Power CXL Flash Adapter: %s\n",
2608 __func__
, CXLFLASH_DRIVER_DATE
);
2610 cxlflash_list_init();
2612 return pci_register_driver(&cxlflash_driver
);
2616 * exit_cxlflash() - module exit point
2618 static void __exit
exit_cxlflash(void)
2620 cxlflash_term_global_luns();
2621 cxlflash_free_errpage();
2623 pci_unregister_driver(&cxlflash_driver
);
2626 module_init(init_cxlflash
);
2627 module_exit(exit_cxlflash
);