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 * cxlflash_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 struct afu_cmd
*cxlflash_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_debug("%s: returning found index=%d\n",
63 memset(cmd
->buf
, 0, CMD_BUFSIZE
);
64 memset(cmd
->rcb
.cdb
, 0, sizeof(cmd
->rcb
.cdb
));
73 * cxlflash_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 void cxlflash_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_debug("%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
;
114 ioarcb
= &(cmd
->rcb
);
117 if (ioasa
->rc
.flags
& SISL_RC_FLAGS_UNDERRUN
) {
118 pr_debug("%s: cmd underrun cmd = %p scp = %p\n",
120 scp
->result
= (DID_ERROR
<< 16);
123 if (ioasa
->rc
.flags
& SISL_RC_FLAGS_OVERRUN
) {
124 pr_debug("%s: cmd underrun cmd = %p scp = %p\n",
126 scp
->result
= (DID_ERROR
<< 16);
129 pr_debug("%s: cmd failed afu_rc=%d scsi_rc=%d fc_rc=%d "
130 "afu_extra=0x%X, scsi_entra=0x%X, fc_extra=0x%X\n",
131 __func__
, ioasa
->rc
.afu_rc
, ioasa
->rc
.scsi_rc
,
132 ioasa
->rc
.fc_rc
, ioasa
->afu_extra
, ioasa
->scsi_extra
,
135 if (ioasa
->rc
.scsi_rc
) {
136 /* We have a SCSI status */
137 if (ioasa
->rc
.flags
& SISL_RC_FLAGS_SENSE_VALID
) {
138 memcpy(scp
->sense_buffer
, ioasa
->sense_data
,
139 SISL_SENSE_DATA_LEN
);
140 scp
->result
= ioasa
->rc
.scsi_rc
;
142 scp
->result
= ioasa
->rc
.scsi_rc
| (DID_ERROR
<< 16);
146 * We encountered an error. Set scp->result based on nature
149 if (ioasa
->rc
.fc_rc
) {
150 /* We have an FC status */
151 switch (ioasa
->rc
.fc_rc
) {
152 case SISL_FC_RC_LINKDOWN
:
153 scp
->result
= (DID_REQUEUE
<< 16);
155 case SISL_FC_RC_RESID
:
156 /* This indicates an FCP resid underrun */
157 if (!(ioasa
->rc
.flags
& SISL_RC_FLAGS_OVERRUN
)) {
158 /* If the SISL_RC_FLAGS_OVERRUN flag was set,
159 * then we will handle this error else where.
160 * If not then we must handle it here.
161 * This is probably an AFU bug. We will
162 * attempt a retry to see if that resolves it.
164 scp
->result
= (DID_ERROR
<< 16);
167 case SISL_FC_RC_RESIDERR
:
168 /* Resid mismatch between adapter and device */
169 case SISL_FC_RC_TGTABORT
:
170 case SISL_FC_RC_ABORTOK
:
171 case SISL_FC_RC_ABORTFAIL
:
172 case SISL_FC_RC_NOLOGI
:
173 case SISL_FC_RC_ABORTPEND
:
174 case SISL_FC_RC_WRABORTPEND
:
175 case SISL_FC_RC_NOEXP
:
176 case SISL_FC_RC_INUSE
:
177 scp
->result
= (DID_ERROR
<< 16);
182 if (ioasa
->rc
.afu_rc
) {
183 /* We have an AFU error */
184 switch (ioasa
->rc
.afu_rc
) {
185 case SISL_AFU_RC_NO_CHANNELS
:
186 scp
->result
= (DID_MEDIUM_ERROR
<< 16);
188 case SISL_AFU_RC_DATA_DMA_ERR
:
189 switch (ioasa
->afu_extra
) {
190 case SISL_AFU_DMA_ERR_PAGE_IN
:
192 scp
->result
= (DID_IMM_RETRY
<< 16);
194 case SISL_AFU_DMA_ERR_INVALID_EA
:
196 scp
->result
= (DID_ERROR
<< 16);
199 case SISL_AFU_RC_OUT_OF_DATA_BUFS
:
201 scp
->result
= (DID_ALLOC_FAILURE
<< 16);
204 scp
->result
= (DID_ERROR
<< 16);
210 * cmd_complete() - command completion handler
211 * @cmd: AFU command that has completed.
213 * Prepares and submits command that has either completed or timed out to
214 * the SCSI stack. Checks AFU command back into command pool for non-internal
215 * (rcb.scp populated) commands.
217 static void cmd_complete(struct afu_cmd
*cmd
)
219 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
.rc
.afu_rc
||
233 cmd
->sa
.rc
.scsi_rc
||
235 process_cmd_err(cmd
, scp
);
237 scp
->result
= (DID_OK
<< 16);
239 resid
= cmd
->sa
.resid
;
240 cmd_is_tmf
= cmd
->cmd_tmf
;
241 cxlflash_cmd_checkin(cmd
); /* Don't use cmd after here */
243 pr_debug("%s: calling scsi_set_resid, scp=%p "
244 "result=%X resid=%d\n", __func__
,
245 scp
, scp
->result
, resid
);
247 scsi_set_resid(scp
, resid
);
252 spin_lock_irqsave(&cfg
->tmf_waitq
.lock
, lock_flags
);
253 cfg
->tmf_active
= false;
254 wake_up_all_locked(&cfg
->tmf_waitq
);
255 spin_unlock_irqrestore(&cfg
->tmf_waitq
.lock
,
259 complete(&cmd
->cevent
);
263 * send_tmf() - sends a Task Management Function (TMF)
264 * @afu: AFU to checkout from.
265 * @scp: SCSI command from stack.
266 * @tmfcmd: TMF command to send.
270 * SCSI_MLQUEUE_HOST_BUSY when host is busy
272 static int send_tmf(struct afu
*afu
, struct scsi_cmnd
*scp
, u64 tmfcmd
)
276 u32 port_sel
= scp
->device
->channel
+ 1;
278 struct Scsi_Host
*host
= scp
->device
->host
;
279 struct cxlflash_cfg
*cfg
= (struct cxlflash_cfg
*)host
->hostdata
;
283 cmd
= cxlflash_cmd_checkout(afu
);
284 if (unlikely(!cmd
)) {
285 pr_err("%s: could not get a free command\n", __func__
);
286 rc
= SCSI_MLQUEUE_HOST_BUSY
;
290 /* If a Task Management Function is active, do not send one more.
292 spin_lock_irqsave(&cfg
->tmf_waitq
.lock
, lock_flags
);
294 wait_event_interruptible_locked_irq(cfg
->tmf_waitq
,
296 cfg
->tmf_active
= true;
298 spin_unlock_irqrestore(&cfg
->tmf_waitq
.lock
, lock_flags
);
300 cmd
->rcb
.ctx_id
= afu
->ctx_hndl
;
301 cmd
->rcb
.port_sel
= port_sel
;
302 cmd
->rcb
.lun_id
= lun_to_lunid(scp
->device
->lun
);
304 lflag
= SISL_REQ_FLAGS_TMF_CMD
;
306 cmd
->rcb
.req_flags
= (SISL_REQ_FLAGS_PORT_LUN_ID
|
307 SISL_REQ_FLAGS_SUP_UNDERRUN
| lflag
);
309 /* Stash the scp in the reserved field, for reuse during interrupt */
312 /* Copy the CDB from the cmd passed in */
313 memcpy(cmd
->rcb
.cdb
, &tmfcmd
, sizeof(tmfcmd
));
315 /* Send the command */
316 rc
= cxlflash_send_cmd(afu
, cmd
);
318 cxlflash_cmd_checkin(cmd
);
319 spin_lock_irqsave(&cfg
->tmf_waitq
.lock
, lock_flags
);
320 cfg
->tmf_active
= false;
321 spin_unlock_irqrestore(&cfg
->tmf_waitq
.lock
, lock_flags
);
325 spin_lock_irqsave(&cfg
->tmf_waitq
.lock
, lock_flags
);
326 wait_event_interruptible_locked_irq(cfg
->tmf_waitq
, !cfg
->tmf_active
);
327 spin_unlock_irqrestore(&cfg
->tmf_waitq
.lock
, lock_flags
);
333 * cxlflash_driver_info() - information handler for this host driver
334 * @host: SCSI host associated with device.
336 * Return: A string describing the device.
338 static const char *cxlflash_driver_info(struct Scsi_Host
*host
)
340 return CXLFLASH_ADAPTER_NAME
;
344 * cxlflash_queuecommand() - sends a mid-layer request
345 * @host: SCSI host associated with device.
346 * @scp: SCSI command to send.
350 * SCSI_MLQUEUE_HOST_BUSY when host is busy
352 static int cxlflash_queuecommand(struct Scsi_Host
*host
, struct scsi_cmnd
*scp
)
354 struct cxlflash_cfg
*cfg
= (struct cxlflash_cfg
*)host
->hostdata
;
355 struct afu
*afu
= cfg
->afu
;
356 struct pci_dev
*pdev
= cfg
->dev
;
358 u32 port_sel
= scp
->device
->channel
+ 1;
360 struct scatterlist
*sg
;
365 pr_debug("%s: (scp=%p) %d/%d/%d/%llu cdb=(%08X-%08X-%08X-%08X)\n",
366 __func__
, scp
, host
->host_no
, scp
->device
->channel
,
367 scp
->device
->id
, scp
->device
->lun
,
368 get_unaligned_be32(&((u32
*)scp
->cmnd
)[0]),
369 get_unaligned_be32(&((u32
*)scp
->cmnd
)[1]),
370 get_unaligned_be32(&((u32
*)scp
->cmnd
)[2]),
371 get_unaligned_be32(&((u32
*)scp
->cmnd
)[3]));
373 /* If a Task Management Function is active, wait for it to complete
374 * before continuing with regular commands.
376 spin_lock_irqsave(&cfg
->tmf_waitq
.lock
, lock_flags
);
377 if (cfg
->tmf_active
) {
378 spin_unlock_irqrestore(&cfg
->tmf_waitq
.lock
, lock_flags
);
379 rc
= SCSI_MLQUEUE_HOST_BUSY
;
382 spin_unlock_irqrestore(&cfg
->tmf_waitq
.lock
, lock_flags
);
384 switch (cfg
->state
) {
386 dev_dbg_ratelimited(&cfg
->dev
->dev
, "%s: device in limbo!\n",
388 rc
= SCSI_MLQUEUE_HOST_BUSY
;
391 dev_dbg_ratelimited(&cfg
->dev
->dev
, "%s: device has failed!\n",
393 scp
->result
= (DID_NO_CONNECT
<< 16);
401 cmd
= cxlflash_cmd_checkout(afu
);
402 if (unlikely(!cmd
)) {
403 pr_err("%s: could not get a free command\n", __func__
);
404 rc
= SCSI_MLQUEUE_HOST_BUSY
;
408 cmd
->rcb
.ctx_id
= afu
->ctx_hndl
;
409 cmd
->rcb
.port_sel
= port_sel
;
410 cmd
->rcb
.lun_id
= lun_to_lunid(scp
->device
->lun
);
412 if (scp
->sc_data_direction
== DMA_TO_DEVICE
)
413 lflag
= SISL_REQ_FLAGS_HOST_WRITE
;
415 lflag
= SISL_REQ_FLAGS_HOST_READ
;
417 cmd
->rcb
.req_flags
= (SISL_REQ_FLAGS_PORT_LUN_ID
|
418 SISL_REQ_FLAGS_SUP_UNDERRUN
| lflag
);
420 /* Stash the scp in the reserved field, for reuse during interrupt */
423 nseg
= scsi_dma_map(scp
);
424 if (unlikely(nseg
< 0)) {
425 dev_err(&pdev
->dev
, "%s: Fail DMA map! nseg=%d\n",
427 rc
= SCSI_MLQUEUE_HOST_BUSY
;
431 ncount
= scsi_sg_count(scp
);
432 scsi_for_each_sg(scp
, sg
, ncount
, i
) {
433 cmd
->rcb
.data_len
= sg_dma_len(sg
);
434 cmd
->rcb
.data_ea
= sg_dma_address(sg
);
437 /* Copy the CDB from the scsi_cmnd passed in */
438 memcpy(cmd
->rcb
.cdb
, scp
->cmnd
, sizeof(cmd
->rcb
.cdb
));
440 /* Send the command */
441 rc
= cxlflash_send_cmd(afu
, cmd
);
443 cxlflash_cmd_checkin(cmd
);
452 * cxlflash_eh_device_reset_handler() - reset a single LUN
453 * @scp: SCSI command to send.
456 * SUCCESS as defined in scsi/scsi.h
457 * FAILED as defined in scsi/scsi.h
459 static int cxlflash_eh_device_reset_handler(struct scsi_cmnd
*scp
)
462 struct Scsi_Host
*host
= scp
->device
->host
;
463 struct cxlflash_cfg
*cfg
= (struct cxlflash_cfg
*)host
->hostdata
;
464 struct afu
*afu
= cfg
->afu
;
467 pr_debug("%s: (scp=%p) %d/%d/%d/%llu "
468 "cdb=(%08X-%08X-%08X-%08X)\n", __func__
, scp
,
469 host
->host_no
, scp
->device
->channel
,
470 scp
->device
->id
, scp
->device
->lun
,
471 get_unaligned_be32(&((u32
*)scp
->cmnd
)[0]),
472 get_unaligned_be32(&((u32
*)scp
->cmnd
)[1]),
473 get_unaligned_be32(&((u32
*)scp
->cmnd
)[2]),
474 get_unaligned_be32(&((u32
*)scp
->cmnd
)[3]));
476 switch (cfg
->state
) {
478 rcr
= send_tmf(afu
, scp
, TMF_LUN_RESET
);
483 wait_event(cfg
->limbo_waitq
, cfg
->state
!= STATE_LIMBO
);
484 if (cfg
->state
== STATE_NORMAL
)
492 pr_debug("%s: returning rc=%d\n", __func__
, rc
);
497 * cxlflash_eh_host_reset_handler() - reset the host adapter
498 * @scp: SCSI command from stack identifying host.
501 * SUCCESS as defined in scsi/scsi.h
502 * FAILED as defined in scsi/scsi.h
504 static int cxlflash_eh_host_reset_handler(struct scsi_cmnd
*scp
)
508 struct Scsi_Host
*host
= scp
->device
->host
;
509 struct cxlflash_cfg
*cfg
= (struct cxlflash_cfg
*)host
->hostdata
;
511 pr_debug("%s: (scp=%p) %d/%d/%d/%llu "
512 "cdb=(%08X-%08X-%08X-%08X)\n", __func__
, scp
,
513 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]));
520 switch (cfg
->state
) {
522 cfg
->state
= STATE_LIMBO
;
523 scsi_block_requests(cfg
->host
);
524 cxlflash_mark_contexts_error(cfg
);
525 rcr
= cxlflash_afu_reset(cfg
);
528 cfg
->state
= STATE_FAILTERM
;
530 cfg
->state
= STATE_NORMAL
;
531 wake_up_all(&cfg
->limbo_waitq
);
532 scsi_unblock_requests(cfg
->host
);
535 wait_event(cfg
->limbo_waitq
, cfg
->state
!= STATE_LIMBO
);
536 if (cfg
->state
== STATE_NORMAL
)
544 pr_debug("%s: returning rc=%d\n", __func__
, rc
);
549 * cxlflash_change_queue_depth() - change the queue depth for the device
550 * @sdev: SCSI device destined for queue depth change.
551 * @qdepth: Requested queue depth value to set.
553 * The requested queue depth is capped to the maximum supported value.
555 * Return: The actual queue depth set.
557 static int cxlflash_change_queue_depth(struct scsi_device
*sdev
, int qdepth
)
560 if (qdepth
> CXLFLASH_MAX_CMDS_PER_LUN
)
561 qdepth
= CXLFLASH_MAX_CMDS_PER_LUN
;
563 scsi_change_queue_depth(sdev
, qdepth
);
564 return sdev
->queue_depth
;
568 * cxlflash_show_port_status() - queries and presents the current port status
569 * @dev: Generic device associated with the host owning the port.
570 * @attr: Device attribute representing the port.
571 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
573 * Return: The size of the ASCII string returned in @buf.
575 static ssize_t
cxlflash_show_port_status(struct device
*dev
,
576 struct device_attribute
*attr
,
579 struct Scsi_Host
*shost
= class_to_shost(dev
);
580 struct cxlflash_cfg
*cfg
= (struct cxlflash_cfg
*)shost
->hostdata
;
581 struct afu
*afu
= cfg
->afu
;
589 rc
= kstrtouint((attr
->attr
.name
+ 4), 10, &port
);
590 if (rc
|| (port
>= NUM_FC_PORTS
))
593 fc_regs
= &afu
->afu_map
->global
.fc_regs
[port
][0];
595 (readq_be(&fc_regs
[FC_MTIP_STATUS
/ 8]) & FC_MTIP_STATUS_MASK
);
597 if (status
== FC_MTIP_STATUS_ONLINE
)
598 disp_status
= "online";
599 else if (status
== FC_MTIP_STATUS_OFFLINE
)
600 disp_status
= "offline";
602 disp_status
= "unknown";
604 return snprintf(buf
, PAGE_SIZE
, "%s\n", disp_status
);
608 * cxlflash_show_lun_mode() - presents the current LUN mode of the host
609 * @dev: Generic device associated with the host.
610 * @attr: Device attribute representing the lun mode.
611 * @buf: Buffer of length PAGE_SIZE to report back the LUN mode in ASCII.
613 * Return: The size of the ASCII string returned in @buf.
615 static ssize_t
cxlflash_show_lun_mode(struct device
*dev
,
616 struct device_attribute
*attr
, char *buf
)
618 struct Scsi_Host
*shost
= class_to_shost(dev
);
619 struct cxlflash_cfg
*cfg
= (struct cxlflash_cfg
*)shost
->hostdata
;
620 struct afu
*afu
= cfg
->afu
;
622 return snprintf(buf
, PAGE_SIZE
, "%u\n", afu
->internal_lun
);
626 * cxlflash_store_lun_mode() - sets the LUN mode of the host
627 * @dev: Generic device associated with the host.
628 * @attr: Device attribute representing the lun mode.
629 * @buf: Buffer of length PAGE_SIZE containing the LUN mode in ASCII.
630 * @count: Length of data resizing in @buf.
632 * The CXL Flash AFU supports a dummy LUN mode where the external
633 * links and storage are not required. Space on the FPGA is used
634 * to create 1 or 2 small LUNs which are presented to the system
635 * as if they were a normal storage device. This feature is useful
636 * during development and also provides manufacturing with a way
637 * to test the AFU without an actual device.
639 * 0 = external LUN[s] (default)
640 * 1 = internal LUN (1 x 64K, 512B blocks, id 0)
641 * 2 = internal LUN (1 x 64K, 4K blocks, id 0)
642 * 3 = internal LUN (2 x 32K, 512B blocks, ids 0,1)
643 * 4 = internal LUN (2 x 32K, 4K blocks, ids 0,1)
645 * Return: The size of the ASCII string returned in @buf.
647 static ssize_t
cxlflash_store_lun_mode(struct device
*dev
,
648 struct device_attribute
*attr
,
649 const char *buf
, size_t count
)
651 struct Scsi_Host
*shost
= class_to_shost(dev
);
652 struct cxlflash_cfg
*cfg
= (struct cxlflash_cfg
*)shost
->hostdata
;
653 struct afu
*afu
= cfg
->afu
;
657 rc
= kstrtouint(buf
, 10, &lun_mode
);
658 if (!rc
&& (lun_mode
< 5) && (lun_mode
!= afu
->internal_lun
)) {
659 afu
->internal_lun
= lun_mode
;
660 cxlflash_afu_reset(cfg
);
661 scsi_scan_host(cfg
->host
);
668 * cxlflash_show_ioctl_version() - presents the current ioctl version of the host
669 * @dev: Generic device associated with the host.
670 * @attr: Device attribute representing the ioctl version.
671 * @buf: Buffer of length PAGE_SIZE to report back the ioctl version.
673 * Return: The size of the ASCII string returned in @buf.
675 static ssize_t
cxlflash_show_ioctl_version(struct device
*dev
,
676 struct device_attribute
*attr
,
679 return scnprintf(buf
, PAGE_SIZE
, "%u\n", DK_CXLFLASH_VERSION_0
);
683 * cxlflash_show_dev_mode() - presents the current mode of the device
684 * @dev: Generic device associated with the device.
685 * @attr: Device attribute representing the device mode.
686 * @buf: Buffer of length PAGE_SIZE to report back the dev mode in ASCII.
688 * Return: The size of the ASCII string returned in @buf.
690 static ssize_t
cxlflash_show_dev_mode(struct device
*dev
,
691 struct device_attribute
*attr
, char *buf
)
693 struct scsi_device
*sdev
= to_scsi_device(dev
);
695 return snprintf(buf
, PAGE_SIZE
, "%s\n",
696 sdev
->hostdata
? "superpipe" : "legacy");
700 * cxlflash_wait_for_pci_err_recovery() - wait for error recovery during probe
701 * @cxlflash: Internal structure associated with the host.
703 static void cxlflash_wait_for_pci_err_recovery(struct cxlflash_cfg
*cfg
)
705 struct pci_dev
*pdev
= cfg
->dev
;
707 if (pci_channel_offline(pdev
))
708 wait_event_timeout(cfg
->limbo_waitq
,
709 !pci_channel_offline(pdev
),
710 CXLFLASH_PCI_ERROR_RECOVERY_TIMEOUT
);
716 static DEVICE_ATTR(port0
, S_IRUGO
, cxlflash_show_port_status
, NULL
);
717 static DEVICE_ATTR(port1
, S_IRUGO
, cxlflash_show_port_status
, NULL
);
718 static DEVICE_ATTR(lun_mode
, S_IRUGO
| S_IWUSR
, cxlflash_show_lun_mode
,
719 cxlflash_store_lun_mode
);
720 static DEVICE_ATTR(ioctl_version
, S_IRUGO
, cxlflash_show_ioctl_version
, NULL
);
722 static struct device_attribute
*cxlflash_host_attrs
[] = {
726 &dev_attr_ioctl_version
,
733 static DEVICE_ATTR(mode
, S_IRUGO
, cxlflash_show_dev_mode
, NULL
);
735 static struct device_attribute
*cxlflash_dev_attrs
[] = {
743 static struct scsi_host_template driver_template
= {
744 .module
= THIS_MODULE
,
745 .name
= CXLFLASH_ADAPTER_NAME
,
746 .info
= cxlflash_driver_info
,
747 .ioctl
= cxlflash_ioctl
,
748 .proc_name
= CXLFLASH_NAME
,
749 .queuecommand
= cxlflash_queuecommand
,
750 .eh_device_reset_handler
= cxlflash_eh_device_reset_handler
,
751 .eh_host_reset_handler
= cxlflash_eh_host_reset_handler
,
752 .change_queue_depth
= cxlflash_change_queue_depth
,
754 .can_queue
= CXLFLASH_MAX_CMDS
,
756 .sg_tablesize
= SG_NONE
, /* No scatter gather support. */
757 .max_sectors
= CXLFLASH_MAX_SECTORS
,
758 .use_clustering
= ENABLE_CLUSTERING
,
759 .shost_attrs
= cxlflash_host_attrs
,
760 .sdev_attrs
= cxlflash_dev_attrs
,
764 * Device dependent values
766 static struct dev_dependent_vals dev_corsa_vals
= { CXLFLASH_MAX_SECTORS
};
769 * PCI device binding table
771 static struct pci_device_id cxlflash_pci_table
[] = {
772 {PCI_VENDOR_ID_IBM
, PCI_DEVICE_ID_IBM_CORSA
,
773 PCI_ANY_ID
, PCI_ANY_ID
, 0, 0, (kernel_ulong_t
)&dev_corsa_vals
},
777 MODULE_DEVICE_TABLE(pci
, cxlflash_pci_table
);
780 * free_mem() - free memory associated with the AFU
781 * @cxlflash: Internal structure associated with the host.
783 static void free_mem(struct cxlflash_cfg
*cfg
)
787 struct afu
*afu
= cfg
->afu
;
790 for (i
= 0; i
< CXLFLASH_NUM_CMDS
; i
++) {
791 buf
= afu
->cmd
[i
].buf
;
792 if (!((u64
)buf
& (PAGE_SIZE
- 1)))
793 free_page((ulong
)buf
);
796 free_pages((ulong
)afu
, get_order(sizeof(struct afu
)));
802 * stop_afu() - stops the AFU command timers and unmaps the MMIO space
803 * @cxlflash: Internal structure associated with the host.
805 * Safe to call with AFU in a partially allocated/initialized state.
807 static void stop_afu(struct cxlflash_cfg
*cfg
)
810 struct afu
*afu
= cfg
->afu
;
813 for (i
= 0; i
< CXLFLASH_NUM_CMDS
; i
++)
814 complete(&afu
->cmd
[i
].cevent
);
816 if (likely(afu
->afu_map
)) {
817 cxl_psa_unmap((void *)afu
->afu_map
);
824 * term_mc() - terminates the master context
825 * @cxlflash: Internal structure associated with the host.
826 * @level: Depth of allocation, where to begin waterfall tear down.
828 * Safe to call with AFU/MC in partially allocated/initialized state.
830 static void term_mc(struct cxlflash_cfg
*cfg
, enum undo_level level
)
833 struct afu
*afu
= cfg
->afu
;
835 if (!afu
|| !cfg
->mcctx
) {
836 pr_err("%s: returning from term_mc with NULL afu or MC\n",
843 rc
= cxl_stop_context(cfg
->mcctx
);
846 cxl_unmap_afu_irq(cfg
->mcctx
, 3, afu
);
848 cxl_unmap_afu_irq(cfg
->mcctx
, 2, afu
);
850 cxl_unmap_afu_irq(cfg
->mcctx
, 1, afu
);
852 cxl_free_afu_irqs(cfg
->mcctx
);
853 case RELEASE_CONTEXT
:
859 * term_afu() - terminates the AFU
860 * @cxlflash: Internal structure associated with the host.
862 * Safe to call with AFU/MC in partially allocated/initialized state.
864 static void term_afu(struct cxlflash_cfg
*cfg
)
866 term_mc(cfg
, UNDO_START
);
871 pr_debug("%s: returning\n", __func__
);
875 * cxlflash_remove() - PCI entry point to tear down host
876 * @pdev: PCI device associated with the host.
878 * Safe to use as a cleanup in partially allocated/initialized state.
880 static void cxlflash_remove(struct pci_dev
*pdev
)
882 struct cxlflash_cfg
*cfg
= pci_get_drvdata(pdev
);
885 /* If a Task Management Function is active, wait for it to complete
886 * before continuing with remove.
888 spin_lock_irqsave(&cfg
->tmf_waitq
.lock
, lock_flags
);
890 wait_event_interruptible_locked_irq(cfg
->tmf_waitq
,
892 spin_unlock_irqrestore(&cfg
->tmf_waitq
.lock
, lock_flags
);
894 cfg
->state
= STATE_FAILTERM
;
895 cxlflash_stop_term_user_contexts(cfg
);
897 switch (cfg
->init_state
) {
898 case INIT_STATE_SCSI
:
899 cxlflash_term_local_luns(cfg
);
900 scsi_remove_host(cfg
->host
);
901 scsi_host_put(cfg
->host
);
906 pci_release_regions(cfg
->dev
);
907 pci_disable_device(pdev
);
908 case INIT_STATE_NONE
:
909 flush_work(&cfg
->work_q
);
914 pr_debug("%s: returning\n", __func__
);
918 * alloc_mem() - allocates the AFU and its command pool
919 * @cxlflash: Internal structure associated with the host.
921 * A partially allocated state remains on failure.
925 * -ENOMEM on failure to allocate memory
927 static int alloc_mem(struct cxlflash_cfg
*cfg
)
933 /* This allocation is about 12K, i.e. only 1 64k page
934 * and upto 4 4k pages
936 cfg
->afu
= (void *)__get_free_pages(GFP_KERNEL
| __GFP_ZERO
,
937 get_order(sizeof(struct afu
)));
938 if (unlikely(!cfg
->afu
)) {
939 pr_err("%s: cannot get %d free pages\n",
940 __func__
, get_order(sizeof(struct afu
)));
944 cfg
->afu
->parent
= cfg
;
945 cfg
->afu
->afu_map
= NULL
;
947 for (i
= 0; i
< CXLFLASH_NUM_CMDS
; buf
+= CMD_BUFSIZE
, i
++) {
948 if (!((u64
)buf
& (PAGE_SIZE
- 1))) {
949 buf
= (void *)__get_free_page(GFP_KERNEL
| __GFP_ZERO
);
950 if (unlikely(!buf
)) {
951 pr_err("%s: Allocate command buffers fail!\n",
959 cfg
->afu
->cmd
[i
].buf
= buf
;
960 atomic_set(&cfg
->afu
->cmd
[i
].free
, 1);
961 cfg
->afu
->cmd
[i
].slot
= i
;
969 * init_pci() - initializes the host as a PCI device
970 * @cxlflash: Internal structure associated with the host.
974 * -EIO on unable to communicate with device
975 * A return code from the PCI sub-routines
977 static int init_pci(struct cxlflash_cfg
*cfg
)
979 struct pci_dev
*pdev
= cfg
->dev
;
982 cfg
->cxlflash_regs_pci
= pci_resource_start(pdev
, 0);
983 rc
= pci_request_regions(pdev
, CXLFLASH_NAME
);
986 "%s: Couldn't register memory range of registers\n",
991 rc
= pci_enable_device(pdev
);
992 if (rc
|| pci_channel_offline(pdev
)) {
993 if (pci_channel_offline(pdev
)) {
994 cxlflash_wait_for_pci_err_recovery(cfg
);
995 rc
= pci_enable_device(pdev
);
999 dev_err(&pdev
->dev
, "%s: Cannot enable adapter\n",
1001 cxlflash_wait_for_pci_err_recovery(cfg
);
1002 goto out_release_regions
;
1006 rc
= pci_set_dma_mask(pdev
, DMA_BIT_MASK(64));
1008 dev_dbg(&pdev
->dev
, "%s: Failed to set 64 bit PCI DMA mask\n",
1010 rc
= pci_set_dma_mask(pdev
, DMA_BIT_MASK(32));
1014 dev_err(&pdev
->dev
, "%s: Failed to set PCI DMA mask\n",
1019 pci_set_master(pdev
);
1021 if (pci_channel_offline(pdev
)) {
1022 cxlflash_wait_for_pci_err_recovery(cfg
);
1023 if (pci_channel_offline(pdev
)) {
1025 goto out_msi_disable
;
1029 rc
= pci_save_state(pdev
);
1031 if (rc
!= PCIBIOS_SUCCESSFUL
) {
1032 dev_err(&pdev
->dev
, "%s: Failed to save PCI config space\n",
1039 pr_debug("%s: returning rc=%d\n", __func__
, rc
);
1044 cxlflash_wait_for_pci_err_recovery(cfg
);
1046 pci_disable_device(pdev
);
1047 out_release_regions
:
1048 pci_release_regions(pdev
);
1054 * init_scsi() - adds the host to the SCSI stack and kicks off host scan
1055 * @cxlflash: Internal structure associated with the host.
1059 * A return code from adding the host
1061 static int init_scsi(struct cxlflash_cfg
*cfg
)
1063 struct pci_dev
*pdev
= cfg
->dev
;
1066 rc
= scsi_add_host(cfg
->host
, &pdev
->dev
);
1068 dev_err(&pdev
->dev
, "%s: scsi_add_host failed (rc=%d)\n",
1073 scsi_scan_host(cfg
->host
);
1076 pr_debug("%s: returning rc=%d\n", __func__
, rc
);
1081 * set_port_online() - transitions the specified host FC port to online state
1082 * @fc_regs: Top of MMIO region defined for specified port.
1084 * The provided MMIO region must be mapped prior to call. Online state means
1085 * that the FC link layer has synced, completed the handshaking process, and
1086 * is ready for login to start.
1088 static void set_port_online(u64
*fc_regs
)
1092 cmdcfg
= readq_be(&fc_regs
[FC_MTIP_CMDCONFIG
/ 8]);
1093 cmdcfg
&= (~FC_MTIP_CMDCONFIG_OFFLINE
); /* clear OFF_LINE */
1094 cmdcfg
|= (FC_MTIP_CMDCONFIG_ONLINE
); /* set ON_LINE */
1095 writeq_be(cmdcfg
, &fc_regs
[FC_MTIP_CMDCONFIG
/ 8]);
1099 * set_port_offline() - transitions the specified host FC port to offline state
1100 * @fc_regs: Top of MMIO region defined for specified port.
1102 * The provided MMIO region must be mapped prior to call.
1104 static void set_port_offline(u64
*fc_regs
)
1108 cmdcfg
= readq_be(&fc_regs
[FC_MTIP_CMDCONFIG
/ 8]);
1109 cmdcfg
&= (~FC_MTIP_CMDCONFIG_ONLINE
); /* clear ON_LINE */
1110 cmdcfg
|= (FC_MTIP_CMDCONFIG_OFFLINE
); /* set OFF_LINE */
1111 writeq_be(cmdcfg
, &fc_regs
[FC_MTIP_CMDCONFIG
/ 8]);
1115 * wait_port_online() - waits for the specified host FC port come online
1116 * @fc_regs: Top of MMIO region defined for specified port.
1117 * @delay_us: Number of microseconds to delay between reading port status.
1118 * @nretry: Number of cycles to retry reading port status.
1120 * The provided MMIO region must be mapped prior to call. This will timeout
1121 * when the cable is not plugged in.
1124 * TRUE (1) when the specified port is online
1125 * FALSE (0) when the specified port fails to come online after timeout
1126 * -EINVAL when @delay_us is less than 1000
1128 static int wait_port_online(u64
*fc_regs
, u32 delay_us
, u32 nretry
)
1132 if (delay_us
< 1000) {
1133 pr_err("%s: invalid delay specified %d\n", __func__
, delay_us
);
1138 msleep(delay_us
/ 1000);
1139 status
= readq_be(&fc_regs
[FC_MTIP_STATUS
/ 8]);
1140 } while ((status
& FC_MTIP_STATUS_MASK
) != FC_MTIP_STATUS_ONLINE
&&
1143 return ((status
& FC_MTIP_STATUS_MASK
) == FC_MTIP_STATUS_ONLINE
);
1147 * wait_port_offline() - waits for the specified host FC port go offline
1148 * @fc_regs: Top of MMIO region defined for specified port.
1149 * @delay_us: Number of microseconds to delay between reading port status.
1150 * @nretry: Number of cycles to retry reading port status.
1152 * The provided MMIO region must be mapped prior to call.
1155 * TRUE (1) when the specified port is offline
1156 * FALSE (0) when the specified port fails to go offline after timeout
1157 * -EINVAL when @delay_us is less than 1000
1159 static int wait_port_offline(u64
*fc_regs
, u32 delay_us
, u32 nretry
)
1163 if (delay_us
< 1000) {
1164 pr_err("%s: invalid delay specified %d\n", __func__
, delay_us
);
1169 msleep(delay_us
/ 1000);
1170 status
= readq_be(&fc_regs
[FC_MTIP_STATUS
/ 8]);
1171 } while ((status
& FC_MTIP_STATUS_MASK
) != FC_MTIP_STATUS_OFFLINE
&&
1174 return ((status
& FC_MTIP_STATUS_MASK
) == FC_MTIP_STATUS_OFFLINE
);
1178 * afu_set_wwpn() - configures the WWPN for the specified host FC port
1179 * @afu: AFU associated with the host that owns the specified FC port.
1180 * @port: Port number being configured.
1181 * @fc_regs: Top of MMIO region defined for specified port.
1182 * @wwpn: The world-wide-port-number previously discovered for port.
1184 * The provided MMIO region must be mapped prior to call. As part of the
1185 * sequence to configure the WWPN, the port is toggled offline and then back
1186 * online. This toggling action can cause this routine to delay up to a few
1187 * seconds. When configured to use the internal LUN feature of the AFU, a
1188 * failure to come online is overridden.
1191 * 0 when the WWPN is successfully written and the port comes back online
1192 * -1 when the port fails to go offline or come back up online
1194 static int afu_set_wwpn(struct afu
*afu
, int port
, u64
*fc_regs
, u64 wwpn
)
1198 set_port_offline(fc_regs
);
1200 if (!wait_port_offline(fc_regs
, FC_PORT_STATUS_RETRY_INTERVAL_US
,
1201 FC_PORT_STATUS_RETRY_CNT
)) {
1202 pr_debug("%s: wait on port %d to go offline timed out\n",
1204 ret
= -1; /* but continue on to leave the port back online */
1208 writeq_be(wwpn
, &fc_regs
[FC_PNAME
/ 8]);
1210 set_port_online(fc_regs
);
1212 if (!wait_port_online(fc_regs
, FC_PORT_STATUS_RETRY_INTERVAL_US
,
1213 FC_PORT_STATUS_RETRY_CNT
)) {
1214 pr_debug("%s: wait on port %d to go online timed out\n",
1219 * Override for internal lun!!!
1221 if (afu
->internal_lun
) {
1222 pr_debug("%s: Overriding port %d online timeout!!!\n",
1228 pr_debug("%s: returning rc=%d\n", __func__
, ret
);
1234 * afu_link_reset() - resets the specified host FC port
1235 * @afu: AFU associated with the host that owns the specified FC port.
1236 * @port: Port number being configured.
1237 * @fc_regs: Top of MMIO region defined for specified port.
1239 * The provided MMIO region must be mapped prior to call. The sequence to
1240 * reset the port involves toggling it offline and then back online. This
1241 * action can cause this routine to delay up to a few seconds. An effort
1242 * is made to maintain link with the device by switching to host to use
1243 * the alternate port exclusively while the reset takes place.
1244 * failure to come online is overridden.
1246 static void afu_link_reset(struct afu
*afu
, int port
, u64
*fc_regs
)
1250 /* first switch the AFU to the other links, if any */
1251 port_sel
= readq_be(&afu
->afu_map
->global
.regs
.afu_port_sel
);
1252 port_sel
&= ~(1ULL << port
);
1253 writeq_be(port_sel
, &afu
->afu_map
->global
.regs
.afu_port_sel
);
1254 cxlflash_afu_sync(afu
, 0, 0, AFU_GSYNC
);
1256 set_port_offline(fc_regs
);
1257 if (!wait_port_offline(fc_regs
, FC_PORT_STATUS_RETRY_INTERVAL_US
,
1258 FC_PORT_STATUS_RETRY_CNT
))
1259 pr_err("%s: wait on port %d to go offline timed out\n",
1262 set_port_online(fc_regs
);
1263 if (!wait_port_online(fc_regs
, FC_PORT_STATUS_RETRY_INTERVAL_US
,
1264 FC_PORT_STATUS_RETRY_CNT
))
1265 pr_err("%s: wait on port %d to go online timed out\n",
1268 /* switch back to include this port */
1269 port_sel
|= (1ULL << port
);
1270 writeq_be(port_sel
, &afu
->afu_map
->global
.regs
.afu_port_sel
);
1271 cxlflash_afu_sync(afu
, 0, 0, AFU_GSYNC
);
1273 pr_debug("%s: returning port_sel=%lld\n", __func__
, port_sel
);
1277 * Asynchronous interrupt information table
1279 static const struct asyc_intr_info ainfo
[] = {
1280 {SISL_ASTATUS_FC0_OTHER
, "other error", 0, CLR_FC_ERROR
| LINK_RESET
},
1281 {SISL_ASTATUS_FC0_LOGO
, "target initiated LOGO", 0, 0},
1282 {SISL_ASTATUS_FC0_CRC_T
, "CRC threshold exceeded", 0, LINK_RESET
},
1283 {SISL_ASTATUS_FC0_LOGI_R
, "login timed out, retrying", 0, 0},
1284 {SISL_ASTATUS_FC0_LOGI_F
, "login failed", 0, CLR_FC_ERROR
},
1285 {SISL_ASTATUS_FC0_LOGI_S
, "login succeeded", 0, 0},
1286 {SISL_ASTATUS_FC0_LINK_DN
, "link down", 0, 0},
1287 {SISL_ASTATUS_FC0_LINK_UP
, "link up", 0, 0},
1288 {SISL_ASTATUS_FC1_OTHER
, "other error", 1, CLR_FC_ERROR
| LINK_RESET
},
1289 {SISL_ASTATUS_FC1_LOGO
, "target initiated LOGO", 1, 0},
1290 {SISL_ASTATUS_FC1_CRC_T
, "CRC threshold exceeded", 1, LINK_RESET
},
1291 {SISL_ASTATUS_FC1_LOGI_R
, "login timed out, retrying", 1, 0},
1292 {SISL_ASTATUS_FC1_LOGI_F
, "login failed", 1, CLR_FC_ERROR
},
1293 {SISL_ASTATUS_FC1_LOGI_S
, "login succeeded", 1, 0},
1294 {SISL_ASTATUS_FC1_LINK_DN
, "link down", 1, 0},
1295 {SISL_ASTATUS_FC1_LINK_UP
, "link up", 1, 0},
1296 {0x0, "", 0, 0} /* terminator */
1300 * find_ainfo() - locates and returns asynchronous interrupt information
1301 * @status: Status code set by AFU on error.
1303 * Return: The located information or NULL when the status code is invalid.
1305 static const struct asyc_intr_info
*find_ainfo(u64 status
)
1307 const struct asyc_intr_info
*info
;
1309 for (info
= &ainfo
[0]; info
->status
; info
++)
1310 if (info
->status
== status
)
1317 * afu_err_intr_init() - clears and initializes the AFU for error interrupts
1318 * @afu: AFU associated with the host.
1320 static void afu_err_intr_init(struct afu
*afu
)
1325 /* global async interrupts: AFU clears afu_ctrl on context exit
1326 * if async interrupts were sent to that context. This prevents
1327 * the AFU form sending further async interrupts when
1329 * nobody to receive them.
1333 writeq_be(-1ULL, &afu
->afu_map
->global
.regs
.aintr_mask
);
1334 /* set LISN# to send and point to master context */
1335 reg
= ((u64
) (((afu
->ctx_hndl
<< 8) | SISL_MSI_ASYNC_ERROR
)) << 40);
1337 if (afu
->internal_lun
)
1338 reg
|= 1; /* Bit 63 indicates local lun */
1339 writeq_be(reg
, &afu
->afu_map
->global
.regs
.afu_ctrl
);
1341 writeq_be(-1ULL, &afu
->afu_map
->global
.regs
.aintr_clear
);
1342 /* unmask bits that are of interest */
1343 /* note: afu can send an interrupt after this step */
1344 writeq_be(SISL_ASTATUS_MASK
, &afu
->afu_map
->global
.regs
.aintr_mask
);
1345 /* clear again in case a bit came on after previous clear but before */
1347 writeq_be(-1ULL, &afu
->afu_map
->global
.regs
.aintr_clear
);
1349 /* Clear/Set internal lun bits */
1350 reg
= readq_be(&afu
->afu_map
->global
.fc_regs
[0][FC_CONFIG2
/ 8]);
1351 reg
&= SISL_FC_INTERNAL_MASK
;
1352 if (afu
->internal_lun
)
1353 reg
|= ((u64
)(afu
->internal_lun
- 1) << SISL_FC_INTERNAL_SHIFT
);
1354 writeq_be(reg
, &afu
->afu_map
->global
.fc_regs
[0][FC_CONFIG2
/ 8]);
1356 /* now clear FC errors */
1357 for (i
= 0; i
< NUM_FC_PORTS
; i
++) {
1358 writeq_be(0xFFFFFFFFU
,
1359 &afu
->afu_map
->global
.fc_regs
[i
][FC_ERROR
/ 8]);
1360 writeq_be(0, &afu
->afu_map
->global
.fc_regs
[i
][FC_ERRCAP
/ 8]);
1363 /* sync interrupts for master's IOARRIN write */
1364 /* note that unlike asyncs, there can be no pending sync interrupts */
1365 /* at this time (this is a fresh context and master has not written */
1366 /* IOARRIN yet), so there is nothing to clear. */
1368 /* set LISN#, it is always sent to the context that wrote IOARRIN */
1369 writeq_be(SISL_MSI_SYNC_ERROR
, &afu
->host_map
->ctx_ctrl
);
1370 writeq_be(SISL_ISTATUS_MASK
, &afu
->host_map
->intr_mask
);
1374 * cxlflash_sync_err_irq() - interrupt handler for synchronous errors
1375 * @irq: Interrupt number.
1376 * @data: Private data provided at interrupt registration, the AFU.
1378 * Return: Always return IRQ_HANDLED.
1380 static irqreturn_t
cxlflash_sync_err_irq(int irq
, void *data
)
1382 struct afu
*afu
= (struct afu
*)data
;
1386 reg
= readq_be(&afu
->host_map
->intr_status
);
1387 reg_unmasked
= (reg
& SISL_ISTATUS_UNMASK
);
1389 if (reg_unmasked
== 0UL) {
1390 pr_err("%s: %llX: spurious interrupt, intr_status %016llX\n",
1391 __func__
, (u64
)afu
, reg
);
1392 goto cxlflash_sync_err_irq_exit
;
1395 pr_err("%s: %llX: unexpected interrupt, intr_status %016llX\n",
1396 __func__
, (u64
)afu
, reg
);
1398 writeq_be(reg_unmasked
, &afu
->host_map
->intr_clear
);
1400 cxlflash_sync_err_irq_exit
:
1401 pr_debug("%s: returning rc=%d\n", __func__
, IRQ_HANDLED
);
1406 * cxlflash_rrq_irq() - interrupt handler for read-response queue (normal path)
1407 * @irq: Interrupt number.
1408 * @data: Private data provided at interrupt registration, the AFU.
1410 * Return: Always return IRQ_HANDLED.
1412 static irqreturn_t
cxlflash_rrq_irq(int irq
, void *data
)
1414 struct afu
*afu
= (struct afu
*)data
;
1415 struct afu_cmd
*cmd
;
1416 bool toggle
= afu
->toggle
;
1418 *hrrq_start
= afu
->hrrq_start
,
1419 *hrrq_end
= afu
->hrrq_end
,
1420 *hrrq_curr
= afu
->hrrq_curr
;
1422 /* Process however many RRQ entries that are ready */
1426 if ((entry
& SISL_RESP_HANDLE_T_BIT
) != toggle
)
1429 cmd
= (struct afu_cmd
*)(entry
& ~SISL_RESP_HANDLE_T_BIT
);
1432 /* Advance to next entry or wrap and flip the toggle bit */
1433 if (hrrq_curr
< hrrq_end
)
1436 hrrq_curr
= hrrq_start
;
1437 toggle
^= SISL_RESP_HANDLE_T_BIT
;
1441 afu
->hrrq_curr
= hrrq_curr
;
1442 afu
->toggle
= toggle
;
1448 * cxlflash_async_err_irq() - interrupt handler for asynchronous errors
1449 * @irq: Interrupt number.
1450 * @data: Private data provided at interrupt registration, the AFU.
1452 * Return: Always return IRQ_HANDLED.
1454 static irqreturn_t
cxlflash_async_err_irq(int irq
, void *data
)
1456 struct afu
*afu
= (struct afu
*)data
;
1457 struct cxlflash_cfg
*cfg
;
1459 const struct asyc_intr_info
*info
;
1460 struct sisl_global_map
*global
= &afu
->afu_map
->global
;
1467 reg
= readq_be(&global
->regs
.aintr_status
);
1468 reg_unmasked
= (reg
& SISL_ASTATUS_UNMASK
);
1470 if (reg_unmasked
== 0) {
1471 pr_err("%s: spurious interrupt, aintr_status 0x%016llX\n",
1476 /* it is OK to clear AFU status before FC_ERROR */
1477 writeq_be(reg_unmasked
, &global
->regs
.aintr_clear
);
1479 /* check each bit that is on */
1480 for (i
= 0; reg_unmasked
; i
++, reg_unmasked
= (reg_unmasked
>> 1)) {
1481 info
= find_ainfo(1ULL << i
);
1482 if ((reg_unmasked
& 0x1) || !info
)
1487 pr_err("%s: FC Port %d -> %s, fc_status 0x%08llX\n",
1488 __func__
, port
, info
->desc
,
1489 readq_be(&global
->fc_regs
[port
][FC_STATUS
/ 8]));
1492 * do link reset first, some OTHER errors will set FC_ERROR
1493 * again if cleared before or w/o a reset
1495 if (info
->action
& LINK_RESET
) {
1496 pr_err("%s: FC Port %d: resetting link\n",
1498 cfg
->lr_state
= LINK_RESET_REQUIRED
;
1499 cfg
->lr_port
= port
;
1500 schedule_work(&cfg
->work_q
);
1503 if (info
->action
& CLR_FC_ERROR
) {
1504 reg
= readq_be(&global
->fc_regs
[port
][FC_ERROR
/ 8]);
1507 * since all errors are unmasked, FC_ERROR and FC_ERRCAP
1508 * should be the same and tracing one is sufficient.
1511 pr_err("%s: fc %d: clearing fc_error 0x%08llX\n",
1512 __func__
, port
, reg
);
1514 writeq_be(reg
, &global
->fc_regs
[port
][FC_ERROR
/ 8]);
1515 writeq_be(0, &global
->fc_regs
[port
][FC_ERRCAP
/ 8]);
1520 pr_debug("%s: returning rc=%d, afu=%p\n", __func__
, IRQ_HANDLED
, afu
);
1525 * start_context() - starts the master context
1526 * @cxlflash: Internal structure associated with the host.
1528 * Return: A success or failure value from CXL services.
1530 static int start_context(struct cxlflash_cfg
*cfg
)
1534 rc
= cxl_start_context(cfg
->mcctx
,
1535 cfg
->afu
->work
.work_element_descriptor
,
1538 pr_debug("%s: returning rc=%d\n", __func__
, rc
);
1543 * read_vpd() - obtains the WWPNs from VPD
1544 * @cxlflash: Internal structure associated with the host.
1545 * @wwpn: Array of size NUM_FC_PORTS to pass back WWPNs
1549 * -ENODEV when VPD or WWPN keywords not found
1551 static int read_vpd(struct cxlflash_cfg
*cfg
, u64 wwpn
[])
1553 struct pci_dev
*dev
= cfg
->parent_dev
;
1555 int ro_start
, ro_size
, i
, j
, k
;
1557 char vpd_data
[CXLFLASH_VPD_LEN
];
1558 char tmp_buf
[WWPN_BUF_LEN
] = { 0 };
1559 char *wwpn_vpd_tags
[NUM_FC_PORTS
] = { "V5", "V6" };
1561 /* Get the VPD data from the device */
1562 vpd_size
= pci_read_vpd(dev
, 0, sizeof(vpd_data
), vpd_data
);
1563 if (unlikely(vpd_size
<= 0)) {
1564 pr_err("%s: Unable to read VPD (size = %ld)\n",
1565 __func__
, vpd_size
);
1570 /* Get the read only section offset */
1571 ro_start
= pci_vpd_find_tag(vpd_data
, 0, vpd_size
,
1572 PCI_VPD_LRDT_RO_DATA
);
1573 if (unlikely(ro_start
< 0)) {
1574 pr_err("%s: VPD Read-only data not found\n", __func__
);
1579 /* Get the read only section size, cap when extends beyond read VPD */
1580 ro_size
= pci_vpd_lrdt_size(&vpd_data
[ro_start
]);
1582 i
= ro_start
+ PCI_VPD_LRDT_TAG_SIZE
;
1583 if (unlikely((i
+ j
) > vpd_size
)) {
1584 pr_debug("%s: Might need to read more VPD (%d > %ld)\n",
1585 __func__
, (i
+ j
), vpd_size
);
1586 ro_size
= vpd_size
- i
;
1590 * Find the offset of the WWPN tag within the read only
1591 * VPD data and validate the found field (partials are
1592 * no good to us). Convert the ASCII data to an integer
1593 * value. Note that we must copy to a temporary buffer
1594 * because the conversion service requires that the ASCII
1595 * string be terminated.
1597 for (k
= 0; k
< NUM_FC_PORTS
; k
++) {
1599 i
= ro_start
+ PCI_VPD_LRDT_TAG_SIZE
;
1601 i
= pci_vpd_find_info_keyword(vpd_data
, i
, j
, wwpn_vpd_tags
[k
]);
1602 if (unlikely(i
< 0)) {
1603 pr_err("%s: Port %d WWPN not found in VPD\n",
1609 j
= pci_vpd_info_field_size(&vpd_data
[i
]);
1610 i
+= PCI_VPD_INFO_FLD_HDR_SIZE
;
1611 if (unlikely((i
+ j
> vpd_size
) || (j
!= WWPN_LEN
))) {
1612 pr_err("%s: Port %d WWPN incomplete or VPD corrupt\n",
1618 memcpy(tmp_buf
, &vpd_data
[i
], WWPN_LEN
);
1619 rc
= kstrtoul(tmp_buf
, WWPN_LEN
, (ulong
*)&wwpn
[k
]);
1621 pr_err("%s: Fail to convert port %d WWPN to integer\n",
1629 pr_debug("%s: returning rc=%d\n", __func__
, rc
);
1634 * cxlflash_context_reset() - timeout handler for AFU commands
1635 * @cmd: AFU command that timed out.
1637 * Sends a reset to the AFU.
1639 void cxlflash_context_reset(struct afu_cmd
*cmd
)
1644 struct afu
*afu
= cmd
->parent
;
1647 pr_debug("%s: cmd=%p\n", __func__
, cmd
);
1649 spin_lock_irqsave(&cmd
->slock
, lock_flags
);
1651 /* Already completed? */
1652 if (cmd
->sa
.host_use_b
[0] & B_DONE
) {
1653 spin_unlock_irqrestore(&cmd
->slock
, lock_flags
);
1657 cmd
->sa
.host_use_b
[0] |= (B_DONE
| B_ERROR
| B_TIMEOUT
);
1658 spin_unlock_irqrestore(&cmd
->slock
, lock_flags
);
1661 * We really want to send this reset at all costs, so spread
1662 * out wait time on successive retries for available room.
1665 room
= readq_be(&afu
->host_map
->cmd_room
);
1666 atomic64_set(&afu
->room
, room
);
1670 } while (nretry
++ < MC_ROOM_RETRY_CNT
);
1672 pr_err("%s: no cmd_room to send reset\n", __func__
);
1677 writeq_be(rrin
, &afu
->host_map
->ioarrin
);
1679 rrin
= readq_be(&afu
->host_map
->ioarrin
);
1682 /* Double delay each time */
1684 } while (nretry
++ < MC_ROOM_RETRY_CNT
);
1688 * init_pcr() - initialize the provisioning and control registers
1689 * @cxlflash: Internal structure associated with the host.
1691 * Also sets up fast access to the mapped registers and initializes AFU
1692 * command fields that never change.
1694 void init_pcr(struct cxlflash_cfg
*cfg
)
1696 struct afu
*afu
= cfg
->afu
;
1697 struct sisl_ctrl_map
*ctrl_map
;
1700 for (i
= 0; i
< MAX_CONTEXT
; i
++) {
1701 ctrl_map
= &afu
->afu_map
->ctrls
[i
].ctrl
;
1702 /* disrupt any clients that could be running */
1703 /* e. g. clients that survived a master restart */
1704 writeq_be(0, &ctrl_map
->rht_start
);
1705 writeq_be(0, &ctrl_map
->rht_cnt_id
);
1706 writeq_be(0, &ctrl_map
->ctx_cap
);
1709 /* copy frequently used fields into afu */
1710 afu
->ctx_hndl
= (u16
) cxl_process_element(cfg
->mcctx
);
1711 /* ctx_hndl is 16 bits in CAIA */
1712 afu
->host_map
= &afu
->afu_map
->hosts
[afu
->ctx_hndl
].host
;
1713 afu
->ctrl_map
= &afu
->afu_map
->ctrls
[afu
->ctx_hndl
].ctrl
;
1715 /* Program the Endian Control for the master context */
1716 writeq_be(SISL_ENDIAN_CTRL
, &afu
->host_map
->endian_ctrl
);
1718 /* initialize cmd fields that never change */
1719 for (i
= 0; i
< CXLFLASH_NUM_CMDS
; i
++) {
1720 afu
->cmd
[i
].rcb
.ctx_id
= afu
->ctx_hndl
;
1721 afu
->cmd
[i
].rcb
.msi
= SISL_MSI_RRQ_UPDATED
;
1722 afu
->cmd
[i
].rcb
.rrq
= 0x0;
1727 * init_global() - initialize AFU global registers
1728 * @cxlflash: Internal structure associated with the host.
1730 int init_global(struct cxlflash_cfg
*cfg
)
1732 struct afu
*afu
= cfg
->afu
;
1733 u64 wwpn
[NUM_FC_PORTS
]; /* wwpn of AFU ports */
1734 int i
= 0, num_ports
= 0;
1738 rc
= read_vpd(cfg
, &wwpn
[0]);
1740 pr_err("%s: could not read vpd rc=%d\n", __func__
, rc
);
1744 pr_debug("%s: wwpn0=0x%llX wwpn1=0x%llX\n", __func__
, wwpn
[0], wwpn
[1]);
1746 /* set up RRQ in AFU for master issued cmds */
1747 writeq_be((u64
) afu
->hrrq_start
, &afu
->host_map
->rrq_start
);
1748 writeq_be((u64
) afu
->hrrq_end
, &afu
->host_map
->rrq_end
);
1750 /* AFU configuration */
1751 reg
= readq_be(&afu
->afu_map
->global
.regs
.afu_config
);
1752 reg
|= SISL_AFUCONF_AR_ALL
|SISL_AFUCONF_ENDIAN
;
1753 /* enable all auto retry options and control endianness */
1754 /* leave others at default: */
1755 /* CTX_CAP write protected, mbox_r does not clear on read and */
1756 /* checker on if dual afu */
1757 writeq_be(reg
, &afu
->afu_map
->global
.regs
.afu_config
);
1759 /* global port select: select either port */
1760 if (afu
->internal_lun
) {
1761 /* only use port 0 */
1762 writeq_be(PORT0
, &afu
->afu_map
->global
.regs
.afu_port_sel
);
1763 num_ports
= NUM_FC_PORTS
- 1;
1765 writeq_be(BOTH_PORTS
, &afu
->afu_map
->global
.regs
.afu_port_sel
);
1766 num_ports
= NUM_FC_PORTS
;
1769 for (i
= 0; i
< num_ports
; i
++) {
1770 /* unmask all errors (but they are still masked at AFU) */
1771 writeq_be(0, &afu
->afu_map
->global
.fc_regs
[i
][FC_ERRMSK
/ 8]);
1772 /* clear CRC error cnt & set a threshold */
1773 (void)readq_be(&afu
->afu_map
->global
.
1774 fc_regs
[i
][FC_CNT_CRCERR
/ 8]);
1775 writeq_be(MC_CRC_THRESH
, &afu
->afu_map
->global
.fc_regs
[i
]
1776 [FC_CRC_THRESH
/ 8]);
1778 /* set WWPNs. If already programmed, wwpn[i] is 0 */
1780 afu_set_wwpn(afu
, i
,
1781 &afu
->afu_map
->global
.fc_regs
[i
][0],
1783 pr_err("%s: failed to set WWPN on port %d\n",
1788 /* Programming WWPN back to back causes additional
1789 * offline/online transitions and a PLOGI
1795 /* set up master's own CTX_CAP to allow real mode, host translation */
1796 /* tbls, afu cmds and read/write GSCSI cmds. */
1797 /* First, unlock ctx_cap write by reading mbox */
1798 (void)readq_be(&afu
->ctrl_map
->mbox_r
); /* unlock ctx_cap */
1799 writeq_be((SISL_CTX_CAP_REAL_MODE
| SISL_CTX_CAP_HOST_XLATE
|
1800 SISL_CTX_CAP_READ_CMD
| SISL_CTX_CAP_WRITE_CMD
|
1801 SISL_CTX_CAP_AFU_CMD
| SISL_CTX_CAP_GSCSI_CMD
),
1802 &afu
->ctrl_map
->ctx_cap
);
1803 /* init heartbeat */
1804 afu
->hb
= readq_be(&afu
->afu_map
->global
.regs
.afu_hb
);
1811 * start_afu() - initializes and starts the AFU
1812 * @cxlflash: Internal structure associated with the host.
1814 static int start_afu(struct cxlflash_cfg
*cfg
)
1816 struct afu
*afu
= cfg
->afu
;
1817 struct afu_cmd
*cmd
;
1822 for (i
= 0; i
< CXLFLASH_NUM_CMDS
; i
++) {
1825 init_completion(&cmd
->cevent
);
1826 spin_lock_init(&cmd
->slock
);
1832 /* initialize RRQ pointers */
1833 afu
->hrrq_start
= &afu
->rrq_entry
[0];
1834 afu
->hrrq_end
= &afu
->rrq_entry
[NUM_RRQ_ENTRY
- 1];
1835 afu
->hrrq_curr
= afu
->hrrq_start
;
1838 rc
= init_global(cfg
);
1840 pr_debug("%s: returning rc=%d\n", __func__
, rc
);
1845 * init_mc() - create and register as the master context
1846 * @cxlflash: Internal structure associated with the host.
1850 * -ENOMEM when unable to obtain a context from CXL services
1851 * A failure value from CXL services.
1853 static int init_mc(struct cxlflash_cfg
*cfg
)
1855 struct cxl_context
*ctx
;
1856 struct device
*dev
= &cfg
->dev
->dev
;
1857 struct afu
*afu
= cfg
->afu
;
1859 enum undo_level level
;
1861 ctx
= cxl_get_context(cfg
->dev
);
1866 /* Set it up as a master with the CXL */
1867 cxl_set_master(ctx
);
1869 /* During initialization reset the AFU to start from a clean slate */
1870 rc
= cxl_afu_reset(cfg
->mcctx
);
1872 dev_err(dev
, "%s: initial AFU reset failed rc=%d\n",
1874 level
= RELEASE_CONTEXT
;
1878 rc
= cxl_allocate_afu_irqs(ctx
, 3);
1880 dev_err(dev
, "%s: call to allocate_afu_irqs failed rc=%d!\n",
1882 level
= RELEASE_CONTEXT
;
1886 rc
= cxl_map_afu_irq(ctx
, 1, cxlflash_sync_err_irq
, afu
,
1887 "SISL_MSI_SYNC_ERROR");
1888 if (unlikely(rc
<= 0)) {
1889 dev_err(dev
, "%s: IRQ 1 (SISL_MSI_SYNC_ERROR) map failed!\n",
1895 rc
= cxl_map_afu_irq(ctx
, 2, cxlflash_rrq_irq
, afu
,
1896 "SISL_MSI_RRQ_UPDATED");
1897 if (unlikely(rc
<= 0)) {
1898 dev_err(dev
, "%s: IRQ 2 (SISL_MSI_RRQ_UPDATED) map failed!\n",
1904 rc
= cxl_map_afu_irq(ctx
, 3, cxlflash_async_err_irq
, afu
,
1905 "SISL_MSI_ASYNC_ERROR");
1906 if (unlikely(rc
<= 0)) {
1907 dev_err(dev
, "%s: IRQ 3 (SISL_MSI_ASYNC_ERROR) map failed!\n",
1915 /* This performs the equivalent of the CXL_IOCTL_START_WORK.
1916 * The CXL_IOCTL_GET_PROCESS_ELEMENT is implicit in the process
1917 * element (pe) that is embedded in the context (ctx)
1919 rc
= start_context(cfg
);
1921 dev_err(dev
, "%s: start context failed rc=%d\n", __func__
, rc
);
1922 level
= UNMAP_THREE
;
1926 pr_debug("%s: returning rc=%d\n", __func__
, rc
);
1929 term_mc(cfg
, level
);
1934 * init_afu() - setup as master context and start AFU
1935 * @cxlflash: Internal structure associated with the host.
1937 * This routine is a higher level of control for configuring the
1938 * AFU on probe and reset paths.
1942 * -ENOMEM when unable to map the AFU MMIO space
1943 * A failure value from internal services.
1945 static int init_afu(struct cxlflash_cfg
*cfg
)
1949 struct afu
*afu
= cfg
->afu
;
1950 struct device
*dev
= &cfg
->dev
->dev
;
1952 cxl_perst_reloads_same_image(cfg
->cxl_afu
, true);
1956 dev_err(dev
, "%s: call to init_mc failed, rc=%d!\n",
1961 /* Map the entire MMIO space of the AFU.
1963 afu
->afu_map
= cxl_psa_map(cfg
->mcctx
);
1964 if (!afu
->afu_map
) {
1966 term_mc(cfg
, UNDO_START
);
1967 dev_err(dev
, "%s: call to cxl_psa_map failed!\n", __func__
);
1971 /* don't byte reverse on reading afu_version, else the string form */
1972 /* will be backwards */
1973 reg
= afu
->afu_map
->global
.regs
.afu_version
;
1974 memcpy(afu
->version
, ®
, 8);
1975 afu
->interface_version
=
1976 readq_be(&afu
->afu_map
->global
.regs
.interface_version
);
1977 pr_debug("%s: afu version %s, interface version 0x%llX\n",
1978 __func__
, afu
->version
, afu
->interface_version
);
1980 rc
= start_afu(cfg
);
1982 dev_err(dev
, "%s: call to start_afu failed, rc=%d!\n",
1984 term_mc(cfg
, UNDO_START
);
1985 cxl_psa_unmap((void *)afu
->afu_map
);
1986 afu
->afu_map
= NULL
;
1990 afu_err_intr_init(cfg
->afu
);
1991 atomic64_set(&afu
->room
, readq_be(&afu
->host_map
->cmd_room
));
1993 /* Restore the LUN mappings */
1994 cxlflash_restore_luntable(cfg
);
1996 pr_debug("%s: returning rc=%d\n", __func__
, rc
);
2001 * cxlflash_send_cmd() - sends an AFU command
2002 * @afu: AFU associated with the host.
2003 * @cmd: AFU command to send.
2009 int cxlflash_send_cmd(struct afu
*afu
, struct afu_cmd
*cmd
)
2011 struct cxlflash_cfg
*cfg
= afu
->parent
;
2018 * This routine is used by critical users such an AFU sync and to
2019 * send a task management function (TMF). Thus we want to retry a
2020 * bit before returning an error. To avoid the performance penalty
2021 * of MMIO, we spread the update of 'room' over multiple commands.
2024 newval
= atomic64_dec_if_positive(&afu
->room
);
2027 room
= readq_be(&afu
->host_map
->cmd_room
);
2028 atomic64_set(&afu
->room
, room
);
2032 } while (nretry
++ < MC_ROOM_RETRY_CNT
);
2034 pr_err("%s: no cmd_room to send 0x%X\n",
2035 __func__
, cmd
->rcb
.cdb
[0]);
2038 } else if (unlikely(newval
< 0)) {
2039 /* This should be rare. i.e. Only if two threads race and
2040 * decrement before the MMIO read is done. In this case
2041 * just benefit from the other thread having updated
2044 if (nretry
++ < MC_ROOM_RETRY_CNT
) {
2053 writeq_be((u64
)&cmd
->rcb
, &afu
->host_map
->ioarrin
);
2055 pr_debug("%s: cmd=%p len=%d ea=%p rc=%d\n", __func__
, cmd
,
2056 cmd
->rcb
.data_len
, (void *)cmd
->rcb
.data_ea
, rc
);
2060 afu
->read_room
= true;
2061 schedule_work(&cfg
->work_q
);
2062 rc
= SCSI_MLQUEUE_HOST_BUSY
;
2067 * cxlflash_wait_resp() - polls for a response or timeout to a sent AFU command
2068 * @afu: AFU associated with the host.
2069 * @cmd: AFU command that was sent.
2071 void cxlflash_wait_resp(struct afu
*afu
, struct afu_cmd
*cmd
)
2073 ulong timeout
= jiffies
+ (cmd
->rcb
.timeout
* 2 * HZ
);
2075 timeout
= wait_for_completion_timeout(&cmd
->cevent
, timeout
);
2077 cxlflash_context_reset(cmd
);
2079 if (unlikely(cmd
->sa
.ioasc
!= 0))
2080 pr_err("%s: CMD 0x%X failed, IOASC: flags 0x%X, afu_rc 0x%X, "
2081 "scsi_rc 0x%X, fc_rc 0x%X\n", __func__
, cmd
->rcb
.cdb
[0],
2082 cmd
->sa
.rc
.flags
, cmd
->sa
.rc
.afu_rc
, cmd
->sa
.rc
.scsi_rc
,
2087 * cxlflash_afu_sync() - builds and sends an AFU sync command
2088 * @afu: AFU associated with the host.
2089 * @ctx_hndl_u: Identifies context requesting sync.
2090 * @res_hndl_u: Identifies resource requesting sync.
2091 * @mode: Type of sync to issue (lightweight, heavyweight, global).
2093 * The AFU can only take 1 sync command at a time. This routine enforces this
2094 * limitation by using a mutex to provide exlusive access to the AFU during
2095 * the sync. This design point requires calling threads to not be on interrupt
2096 * context due to the possibility of sleeping during concurrent sync operations.
2098 * AFU sync operations are only necessary and allowed when the device is
2099 * operating normally. When not operating normally, sync requests can occur as
2100 * part of cleaning up resources associated with an adapter prior to removal.
2101 * In this scenario, these requests are simply ignored (safe due to the AFU
2108 int cxlflash_afu_sync(struct afu
*afu
, ctx_hndl_t ctx_hndl_u
,
2109 res_hndl_t res_hndl_u
, u8 mode
)
2111 struct cxlflash_cfg
*cfg
= afu
->parent
;
2112 struct afu_cmd
*cmd
= NULL
;
2115 static DEFINE_MUTEX(sync_active
);
2117 if (cfg
->state
!= STATE_NORMAL
) {
2118 pr_debug("%s: Sync not required! (%u)\n", __func__
, cfg
->state
);
2122 mutex_lock(&sync_active
);
2124 cmd
= cxlflash_cmd_checkout(afu
);
2125 if (unlikely(!cmd
)) {
2127 udelay(1000 * retry_cnt
);
2128 if (retry_cnt
< MC_RETRY_CNT
)
2130 pr_err("%s: could not get a free command\n", __func__
);
2135 pr_debug("%s: afu=%p cmd=%p %d\n", __func__
, afu
, cmd
, ctx_hndl_u
);
2137 memset(cmd
->rcb
.cdb
, 0, sizeof(cmd
->rcb
.cdb
));
2139 cmd
->rcb
.req_flags
= SISL_REQ_FLAGS_AFU_CMD
;
2140 cmd
->rcb
.port_sel
= 0x0; /* NA */
2141 cmd
->rcb
.lun_id
= 0x0; /* NA */
2142 cmd
->rcb
.data_len
= 0x0;
2143 cmd
->rcb
.data_ea
= 0x0;
2144 cmd
->rcb
.timeout
= MC_AFU_SYNC_TIMEOUT
;
2146 cmd
->rcb
.cdb
[0] = 0xC0; /* AFU Sync */
2147 cmd
->rcb
.cdb
[1] = mode
;
2149 /* The cdb is aligned, no unaligned accessors required */
2150 *((u16
*)&cmd
->rcb
.cdb
[2]) = swab16(ctx_hndl_u
);
2151 *((u32
*)&cmd
->rcb
.cdb
[4]) = swab32(res_hndl_u
);
2153 rc
= cxlflash_send_cmd(afu
, cmd
);
2157 cxlflash_wait_resp(afu
, cmd
);
2159 /* set on timeout */
2160 if (unlikely((cmd
->sa
.ioasc
!= 0) ||
2161 (cmd
->sa
.host_use_b
[0] & B_ERROR
)))
2164 mutex_unlock(&sync_active
);
2166 cxlflash_cmd_checkin(cmd
);
2167 pr_debug("%s: returning rc=%d\n", __func__
, rc
);
2172 * cxlflash_afu_reset() - resets the AFU
2173 * @cxlflash: Internal structure associated with the host.
2177 * A failure value from internal services.
2179 int cxlflash_afu_reset(struct cxlflash_cfg
*cfg
)
2182 /* Stop the context before the reset. Since the context is
2183 * no longer available restart it after the reset is complete
2190 pr_debug("%s: returning rc=%d\n", __func__
, rc
);
2195 * cxlflash_worker_thread() - work thread handler for the AFU
2196 * @work: Work structure contained within cxlflash associated with host.
2198 * Handles the following events:
2199 * - Link reset which cannot be performed on interrupt context due to
2200 * blocking up to a few seconds
2201 * - Read AFU command room
2203 static void cxlflash_worker_thread(struct work_struct
*work
)
2205 struct cxlflash_cfg
*cfg
= container_of(work
, struct cxlflash_cfg
,
2207 struct afu
*afu
= cfg
->afu
;
2211 /* Avoid MMIO if the device has failed */
2213 if (cfg
->state
!= STATE_NORMAL
)
2216 spin_lock_irqsave(cfg
->host
->host_lock
, lock_flags
);
2218 if (cfg
->lr_state
== LINK_RESET_REQUIRED
) {
2219 port
= cfg
->lr_port
;
2221 pr_err("%s: invalid port index %d\n", __func__
, port
);
2223 spin_unlock_irqrestore(cfg
->host
->host_lock
,
2226 /* The reset can block... */
2227 afu_link_reset(afu
, port
,
2229 global
.fc_regs
[port
][0]);
2230 spin_lock_irqsave(cfg
->host
->host_lock
, lock_flags
);
2233 cfg
->lr_state
= LINK_RESET_COMPLETE
;
2236 if (afu
->read_room
) {
2237 atomic64_set(&afu
->room
, readq_be(&afu
->host_map
->cmd_room
));
2238 afu
->read_room
= false;
2241 spin_unlock_irqrestore(cfg
->host
->host_lock
, lock_flags
);
2245 * cxlflash_probe() - PCI entry point to add host
2246 * @pdev: PCI device associated with the host.
2247 * @dev_id: PCI device id associated with device.
2249 * Return: 0 on success / non-zero on failure
2251 static int cxlflash_probe(struct pci_dev
*pdev
,
2252 const struct pci_device_id
*dev_id
)
2254 struct Scsi_Host
*host
;
2255 struct cxlflash_cfg
*cfg
= NULL
;
2256 struct device
*phys_dev
;
2257 struct dev_dependent_vals
*ddv
;
2260 dev_dbg(&pdev
->dev
, "%s: Found CXLFLASH with IRQ: %d\n",
2261 __func__
, pdev
->irq
);
2263 ddv
= (struct dev_dependent_vals
*)dev_id
->driver_data
;
2264 driver_template
.max_sectors
= ddv
->max_sectors
;
2266 host
= scsi_host_alloc(&driver_template
, sizeof(struct cxlflash_cfg
));
2268 dev_err(&pdev
->dev
, "%s: call to scsi_host_alloc failed!\n",
2274 host
->max_id
= CXLFLASH_MAX_NUM_TARGETS_PER_BUS
;
2275 host
->max_lun
= CXLFLASH_MAX_NUM_LUNS_PER_TARGET
;
2276 host
->max_channel
= NUM_FC_PORTS
- 1;
2277 host
->unique_id
= host
->host_no
;
2278 host
->max_cmd_len
= CXLFLASH_MAX_CDB_LEN
;
2280 cfg
= (struct cxlflash_cfg
*)host
->hostdata
;
2282 rc
= alloc_mem(cfg
);
2284 dev_err(&pdev
->dev
, "%s: call to scsi_host_alloc failed!\n",
2290 cfg
->init_state
= INIT_STATE_NONE
;
2294 * The promoted LUNs move to the top of the LUN table. The rest stay
2295 * on the bottom half. The bottom half grows from the end
2296 * (index = 255), whereas the top half grows from the beginning
2299 cfg
->promote_lun_index
= 0;
2300 cfg
->last_lun_index
[0] = CXLFLASH_NUM_VLUNS
/2 - 1;
2301 cfg
->last_lun_index
[1] = CXLFLASH_NUM_VLUNS
/2 - 1;
2303 cfg
->dev_id
= (struct pci_device_id
*)dev_id
;
2306 init_waitqueue_head(&cfg
->tmf_waitq
);
2307 init_waitqueue_head(&cfg
->limbo_waitq
);
2309 INIT_WORK(&cfg
->work_q
, cxlflash_worker_thread
);
2310 cfg
->lr_state
= LINK_RESET_INVALID
;
2312 mutex_init(&cfg
->ctx_tbl_list_mutex
);
2313 mutex_init(&cfg
->ctx_recovery_mutex
);
2314 INIT_LIST_HEAD(&cfg
->ctx_err_recovery
);
2315 INIT_LIST_HEAD(&cfg
->lluns
);
2317 pci_set_drvdata(pdev
, cfg
);
2319 /* Use the special service provided to look up the physical
2320 * PCI device, since we are called on the probe of the virtual
2321 * PCI host bus (vphb)
2323 phys_dev
= cxl_get_phys_dev(pdev
);
2324 if (!dev_is_pci(phys_dev
)) {
2325 pr_err("%s: not a pci dev\n", __func__
);
2329 cfg
->parent_dev
= to_pci_dev(phys_dev
);
2331 cfg
->cxl_afu
= cxl_pci_to_afu(pdev
);
2335 dev_err(&pdev
->dev
, "%s: call to init_pci "
2336 "failed rc=%d!\n", __func__
, rc
);
2339 cfg
->init_state
= INIT_STATE_PCI
;
2343 dev_err(&pdev
->dev
, "%s: call to init_afu "
2344 "failed rc=%d!\n", __func__
, rc
);
2347 cfg
->init_state
= INIT_STATE_AFU
;
2350 rc
= init_scsi(cfg
);
2352 dev_err(&pdev
->dev
, "%s: call to init_scsi "
2353 "failed rc=%d!\n", __func__
, rc
);
2356 cfg
->init_state
= INIT_STATE_SCSI
;
2359 pr_debug("%s: returning rc=%d\n", __func__
, rc
);
2363 cxlflash_remove(pdev
);
2368 * cxlflash_pci_error_detected() - called when a PCI error is detected
2369 * @pdev: PCI device struct.
2370 * @state: PCI channel state.
2372 * Return: PCI_ERS_RESULT_NEED_RESET or PCI_ERS_RESULT_DISCONNECT
2374 static pci_ers_result_t
cxlflash_pci_error_detected(struct pci_dev
*pdev
,
2375 pci_channel_state_t state
)
2378 struct cxlflash_cfg
*cfg
= pci_get_drvdata(pdev
);
2379 struct device
*dev
= &cfg
->dev
->dev
;
2381 dev_dbg(dev
, "%s: pdev=%p state=%u\n", __func__
, pdev
, state
);
2384 case pci_channel_io_frozen
:
2385 cfg
->state
= STATE_LIMBO
;
2387 /* Turn off legacy I/O */
2388 scsi_block_requests(cfg
->host
);
2389 rc
= cxlflash_mark_contexts_error(cfg
);
2391 dev_err(dev
, "%s: Failed to mark user contexts!(%d)\n",
2393 term_mc(cfg
, UNDO_START
);
2396 return PCI_ERS_RESULT_NEED_RESET
;
2397 case pci_channel_io_perm_failure
:
2398 cfg
->state
= STATE_FAILTERM
;
2399 wake_up_all(&cfg
->limbo_waitq
);
2400 scsi_unblock_requests(cfg
->host
);
2401 return PCI_ERS_RESULT_DISCONNECT
;
2405 return PCI_ERS_RESULT_NEED_RESET
;
2409 * cxlflash_pci_slot_reset() - called when PCI slot has been reset
2410 * @pdev: PCI device struct.
2412 * This routine is called by the pci error recovery code after the PCI
2413 * slot has been reset, just before we should resume normal operations.
2415 * Return: PCI_ERS_RESULT_RECOVERED or PCI_ERS_RESULT_DISCONNECT
2417 static pci_ers_result_t
cxlflash_pci_slot_reset(struct pci_dev
*pdev
)
2420 struct cxlflash_cfg
*cfg
= pci_get_drvdata(pdev
);
2421 struct device
*dev
= &cfg
->dev
->dev
;
2423 dev_dbg(dev
, "%s: pdev=%p\n", __func__
, pdev
);
2427 dev_err(dev
, "%s: EEH recovery failed! (%d)\n", __func__
, rc
);
2428 return PCI_ERS_RESULT_DISCONNECT
;
2431 return PCI_ERS_RESULT_RECOVERED
;
2435 * cxlflash_pci_resume() - called when normal operation can resume
2436 * @pdev: PCI device struct
2438 static void cxlflash_pci_resume(struct pci_dev
*pdev
)
2440 struct cxlflash_cfg
*cfg
= pci_get_drvdata(pdev
);
2441 struct device
*dev
= &cfg
->dev
->dev
;
2443 dev_dbg(dev
, "%s: pdev=%p\n", __func__
, pdev
);
2445 cfg
->state
= STATE_NORMAL
;
2446 wake_up_all(&cfg
->limbo_waitq
);
2447 scsi_unblock_requests(cfg
->host
);
2450 static const struct pci_error_handlers cxlflash_err_handler
= {
2451 .error_detected
= cxlflash_pci_error_detected
,
2452 .slot_reset
= cxlflash_pci_slot_reset
,
2453 .resume
= cxlflash_pci_resume
,
2457 * PCI device structure
2459 static struct pci_driver cxlflash_driver
= {
2460 .name
= CXLFLASH_NAME
,
2461 .id_table
= cxlflash_pci_table
,
2462 .probe
= cxlflash_probe
,
2463 .remove
= cxlflash_remove
,
2464 .err_handler
= &cxlflash_err_handler
,
2468 * init_cxlflash() - module entry point
2470 * Return: 0 on success / non-zero on failure
2472 static int __init
init_cxlflash(void)
2474 pr_info("%s: IBM Power CXL Flash Adapter: %s\n",
2475 __func__
, CXLFLASH_DRIVER_DATE
);
2477 cxlflash_list_init();
2479 return pci_register_driver(&cxlflash_driver
);
2483 * exit_cxlflash() - module exit point
2485 static void __exit
exit_cxlflash(void)
2487 cxlflash_term_global_luns();
2488 cxlflash_free_errpage();
2490 pci_unregister_driver(&cxlflash_driver
);
2493 module_init(init_cxlflash
);
2494 module_exit(exit_cxlflash
);