2 * CXL Flash Device Driver
4 * Written by: Manoj N. Kumar <manoj@linux.vnet.ibm.com>, IBM Corporation
5 * Matthew R. Ochs <mrochs@linux.vnet.ibm.com>, IBM Corporation
7 * Copyright (C) 2015 IBM Corporation
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
15 #include <linux/delay.h>
16 #include <linux/list.h>
17 #include <linux/module.h>
18 #include <linux/pci.h>
20 #include <asm/unaligned.h>
24 #include <scsi/scsi_cmnd.h>
25 #include <scsi/scsi_host.h>
26 #include <uapi/scsi/cxlflash_ioctl.h>
32 MODULE_DESCRIPTION(CXLFLASH_ADAPTER_NAME
);
33 MODULE_AUTHOR("Manoj N. Kumar <manoj@linux.vnet.ibm.com>");
34 MODULE_AUTHOR("Matthew R. Ochs <mrochs@linux.vnet.ibm.com>");
35 MODULE_LICENSE("GPL");
38 * process_cmd_err() - command error handler
39 * @cmd: AFU command that experienced the error.
40 * @scp: SCSI command associated with the AFU command in error.
42 * Translates error bits from AFU command to SCSI command results.
44 static void process_cmd_err(struct afu_cmd
*cmd
, struct scsi_cmnd
*scp
)
46 struct sisl_ioarcb
*ioarcb
;
47 struct sisl_ioasa
*ioasa
;
56 if (ioasa
->rc
.flags
& SISL_RC_FLAGS_UNDERRUN
) {
58 scsi_set_resid(scp
, resid
);
59 pr_debug("%s: cmd underrun cmd = %p scp = %p, resid = %d\n",
60 __func__
, cmd
, scp
, resid
);
63 if (ioasa
->rc
.flags
& SISL_RC_FLAGS_OVERRUN
) {
64 pr_debug("%s: cmd underrun cmd = %p scp = %p\n",
66 scp
->result
= (DID_ERROR
<< 16);
69 pr_debug("%s: cmd failed afu_rc=%d scsi_rc=%d fc_rc=%d "
70 "afu_extra=0x%X, scsi_extra=0x%X, fc_extra=0x%X\n",
71 __func__
, ioasa
->rc
.afu_rc
, ioasa
->rc
.scsi_rc
,
72 ioasa
->rc
.fc_rc
, ioasa
->afu_extra
, ioasa
->scsi_extra
,
75 if (ioasa
->rc
.scsi_rc
) {
76 /* We have a SCSI status */
77 if (ioasa
->rc
.flags
& SISL_RC_FLAGS_SENSE_VALID
) {
78 memcpy(scp
->sense_buffer
, ioasa
->sense_data
,
80 scp
->result
= ioasa
->rc
.scsi_rc
;
82 scp
->result
= ioasa
->rc
.scsi_rc
| (DID_ERROR
<< 16);
86 * We encountered an error. Set scp->result based on nature
89 if (ioasa
->rc
.fc_rc
) {
90 /* We have an FC status */
91 switch (ioasa
->rc
.fc_rc
) {
92 case SISL_FC_RC_LINKDOWN
:
93 scp
->result
= (DID_REQUEUE
<< 16);
95 case SISL_FC_RC_RESID
:
96 /* This indicates an FCP resid underrun */
97 if (!(ioasa
->rc
.flags
& SISL_RC_FLAGS_OVERRUN
)) {
98 /* If the SISL_RC_FLAGS_OVERRUN flag was set,
99 * then we will handle this error else where.
100 * If not then we must handle it here.
101 * This is probably an AFU bug.
103 scp
->result
= (DID_ERROR
<< 16);
106 case SISL_FC_RC_RESIDERR
:
107 /* Resid mismatch between adapter and device */
108 case SISL_FC_RC_TGTABORT
:
109 case SISL_FC_RC_ABORTOK
:
110 case SISL_FC_RC_ABORTFAIL
:
111 case SISL_FC_RC_NOLOGI
:
112 case SISL_FC_RC_ABORTPEND
:
113 case SISL_FC_RC_WRABORTPEND
:
114 case SISL_FC_RC_NOEXP
:
115 case SISL_FC_RC_INUSE
:
116 scp
->result
= (DID_ERROR
<< 16);
121 if (ioasa
->rc
.afu_rc
) {
122 /* We have an AFU error */
123 switch (ioasa
->rc
.afu_rc
) {
124 case SISL_AFU_RC_NO_CHANNELS
:
125 scp
->result
= (DID_NO_CONNECT
<< 16);
127 case SISL_AFU_RC_DATA_DMA_ERR
:
128 switch (ioasa
->afu_extra
) {
129 case SISL_AFU_DMA_ERR_PAGE_IN
:
131 scp
->result
= (DID_IMM_RETRY
<< 16);
133 case SISL_AFU_DMA_ERR_INVALID_EA
:
135 scp
->result
= (DID_ERROR
<< 16);
138 case SISL_AFU_RC_OUT_OF_DATA_BUFS
:
140 scp
->result
= (DID_ALLOC_FAILURE
<< 16);
143 scp
->result
= (DID_ERROR
<< 16);
149 * cmd_complete() - command completion handler
150 * @cmd: AFU command that has completed.
152 * Prepares and submits command that has either completed or timed out to
153 * the SCSI stack. Checks AFU command back into command pool for non-internal
154 * (cmd->scp populated) commands.
156 static void cmd_complete(struct afu_cmd
*cmd
)
158 struct scsi_cmnd
*scp
;
160 struct afu
*afu
= cmd
->parent
;
161 struct cxlflash_cfg
*cfg
= afu
->parent
;
166 if (unlikely(cmd
->sa
.ioasc
))
167 process_cmd_err(cmd
, scp
);
169 scp
->result
= (DID_OK
<< 16);
171 cmd_is_tmf
= cmd
->cmd_tmf
;
173 pr_debug_ratelimited("%s: calling scsi_done scp=%p result=%X "
174 "ioasc=%d\n", __func__
, scp
, scp
->result
,
181 spin_lock_irqsave(&cfg
->tmf_slock
, lock_flags
);
182 cfg
->tmf_active
= false;
183 wake_up_all_locked(&cfg
->tmf_waitq
);
184 spin_unlock_irqrestore(&cfg
->tmf_slock
, lock_flags
);
187 complete(&cmd
->cevent
);
191 * context_reset_ioarrin() - reset command owner context via IOARRIN register
192 * @cmd: AFU command that timed out.
194 static void context_reset_ioarrin(struct afu_cmd
*cmd
)
198 struct afu
*afu
= cmd
->parent
;
199 struct cxlflash_cfg
*cfg
= afu
->parent
;
200 struct device
*dev
= &cfg
->dev
->dev
;
202 pr_debug("%s: cmd=%p\n", __func__
, cmd
);
204 writeq_be(rrin
, &afu
->host_map
->ioarrin
);
206 rrin
= readq_be(&afu
->host_map
->ioarrin
);
209 /* Double delay each time */
211 } while (nretry
++ < MC_ROOM_RETRY_CNT
);
213 dev_dbg(dev
, "%s: returning rrin=0x%016llX nretry=%d\n",
214 __func__
, rrin
, nretry
);
218 * send_cmd_ioarrin() - sends an AFU command via IOARRIN register
219 * @afu: AFU associated with the host.
220 * @cmd: AFU command to send.
223 * 0 on success, SCSI_MLQUEUE_HOST_BUSY on failure
225 static int send_cmd_ioarrin(struct afu
*afu
, struct afu_cmd
*cmd
)
227 struct cxlflash_cfg
*cfg
= afu
->parent
;
228 struct device
*dev
= &cfg
->dev
->dev
;
234 * To avoid the performance penalty of MMIO, spread the update of
235 * 'room' over multiple commands.
237 spin_lock_irqsave(&afu
->rrin_slock
, lock_flags
);
238 if (--afu
->room
< 0) {
239 room
= readq_be(&afu
->host_map
->cmd_room
);
241 dev_dbg_ratelimited(dev
, "%s: no cmd_room to send "
242 "0x%02X, room=0x%016llX\n",
243 __func__
, cmd
->rcb
.cdb
[0], room
);
245 rc
= SCSI_MLQUEUE_HOST_BUSY
;
248 afu
->room
= room
- 1;
251 writeq_be((u64
)&cmd
->rcb
, &afu
->host_map
->ioarrin
);
253 spin_unlock_irqrestore(&afu
->rrin_slock
, lock_flags
);
254 pr_devel("%s: cmd=%p len=%d ea=%p rc=%d\n", __func__
, cmd
,
255 cmd
->rcb
.data_len
, (void *)cmd
->rcb
.data_ea
, rc
);
260 * wait_resp() - polls for a response or timeout to a sent AFU command
261 * @afu: AFU associated with the host.
262 * @cmd: AFU command that was sent.
265 * 0 on success, -1 on timeout/error
267 static int wait_resp(struct afu
*afu
, struct afu_cmd
*cmd
)
270 ulong timeout
= msecs_to_jiffies(cmd
->rcb
.timeout
* 2 * 1000);
272 timeout
= wait_for_completion_timeout(&cmd
->cevent
, timeout
);
274 afu
->context_reset(cmd
);
278 if (unlikely(cmd
->sa
.ioasc
!= 0)) {
279 pr_err("%s: CMD 0x%X failed, IOASC: flags 0x%X, afu_rc 0x%X, "
280 "scsi_rc 0x%X, fc_rc 0x%X\n", __func__
, cmd
->rcb
.cdb
[0],
281 cmd
->sa
.rc
.flags
, cmd
->sa
.rc
.afu_rc
, cmd
->sa
.rc
.scsi_rc
,
290 * send_tmf() - sends a Task Management Function (TMF)
291 * @afu: AFU to checkout from.
292 * @scp: SCSI command from stack.
293 * @tmfcmd: TMF command to send.
296 * 0 on success, SCSI_MLQUEUE_HOST_BUSY on failure
298 static int send_tmf(struct afu
*afu
, struct scsi_cmnd
*scp
, u64 tmfcmd
)
300 u32 port_sel
= scp
->device
->channel
+ 1;
301 struct Scsi_Host
*host
= scp
->device
->host
;
302 struct cxlflash_cfg
*cfg
= (struct cxlflash_cfg
*)host
->hostdata
;
303 struct afu_cmd
*cmd
= sc_to_afucz(scp
);
304 struct device
*dev
= &cfg
->dev
->dev
;
309 /* When Task Management Function is active do not send another */
310 spin_lock_irqsave(&cfg
->tmf_slock
, lock_flags
);
312 wait_event_interruptible_lock_irq(cfg
->tmf_waitq
,
315 cfg
->tmf_active
= true;
316 spin_unlock_irqrestore(&cfg
->tmf_slock
, lock_flags
);
322 cmd
->rcb
.ctx_id
= afu
->ctx_hndl
;
323 cmd
->rcb
.msi
= SISL_MSI_RRQ_UPDATED
;
324 cmd
->rcb
.port_sel
= port_sel
;
325 cmd
->rcb
.lun_id
= lun_to_lunid(scp
->device
->lun
);
326 cmd
->rcb
.req_flags
= (SISL_REQ_FLAGS_PORT_LUN_ID
|
327 SISL_REQ_FLAGS_SUP_UNDERRUN
|
328 SISL_REQ_FLAGS_TMF_CMD
);
329 memcpy(cmd
->rcb
.cdb
, &tmfcmd
, sizeof(tmfcmd
));
331 rc
= afu
->send_cmd(afu
, cmd
);
333 spin_lock_irqsave(&cfg
->tmf_slock
, lock_flags
);
334 cfg
->tmf_active
= false;
335 spin_unlock_irqrestore(&cfg
->tmf_slock
, lock_flags
);
339 spin_lock_irqsave(&cfg
->tmf_slock
, lock_flags
);
340 to
= msecs_to_jiffies(5000);
341 to
= wait_event_interruptible_lock_irq_timeout(cfg
->tmf_waitq
,
346 cfg
->tmf_active
= false;
347 dev_err(dev
, "%s: TMF timed out!\n", __func__
);
350 spin_unlock_irqrestore(&cfg
->tmf_slock
, lock_flags
);
355 static void afu_unmap(struct kref
*ref
)
357 struct afu
*afu
= container_of(ref
, struct afu
, mapcount
);
359 if (likely(afu
->afu_map
)) {
360 cxl_psa_unmap((void __iomem
*)afu
->afu_map
);
366 * cxlflash_driver_info() - information handler for this host driver
367 * @host: SCSI host associated with device.
369 * Return: A string describing the device.
371 static const char *cxlflash_driver_info(struct Scsi_Host
*host
)
373 return CXLFLASH_ADAPTER_NAME
;
377 * cxlflash_queuecommand() - sends a mid-layer request
378 * @host: SCSI host associated with device.
379 * @scp: SCSI command to send.
381 * Return: 0 on success, SCSI_MLQUEUE_HOST_BUSY on failure
383 static int cxlflash_queuecommand(struct Scsi_Host
*host
, struct scsi_cmnd
*scp
)
385 struct cxlflash_cfg
*cfg
= (struct cxlflash_cfg
*)host
->hostdata
;
386 struct afu
*afu
= cfg
->afu
;
387 struct device
*dev
= &cfg
->dev
->dev
;
388 struct afu_cmd
*cmd
= sc_to_afucz(scp
);
389 struct scatterlist
*sg
= scsi_sglist(scp
);
390 u32 port_sel
= scp
->device
->channel
+ 1;
391 u16 req_flags
= SISL_REQ_FLAGS_SUP_UNDERRUN
;
397 dev_dbg_ratelimited(dev
, "%s: (scp=%p) %d/%d/%d/%llu "
398 "cdb=(%08X-%08X-%08X-%08X)\n",
399 __func__
, scp
, host
->host_no
, scp
->device
->channel
,
400 scp
->device
->id
, scp
->device
->lun
,
401 get_unaligned_be32(&((u32
*)scp
->cmnd
)[0]),
402 get_unaligned_be32(&((u32
*)scp
->cmnd
)[1]),
403 get_unaligned_be32(&((u32
*)scp
->cmnd
)[2]),
404 get_unaligned_be32(&((u32
*)scp
->cmnd
)[3]));
407 * If a Task Management Function is active, wait for it to complete
408 * before continuing with regular commands.
410 spin_lock_irqsave(&cfg
->tmf_slock
, lock_flags
);
411 if (cfg
->tmf_active
) {
412 spin_unlock_irqrestore(&cfg
->tmf_slock
, lock_flags
);
413 rc
= SCSI_MLQUEUE_HOST_BUSY
;
416 spin_unlock_irqrestore(&cfg
->tmf_slock
, lock_flags
);
418 switch (cfg
->state
) {
420 dev_dbg_ratelimited(dev
, "%s: device is in reset!\n", __func__
);
421 rc
= SCSI_MLQUEUE_HOST_BUSY
;
424 dev_dbg_ratelimited(dev
, "%s: device has failed!\n", __func__
);
425 scp
->result
= (DID_NO_CONNECT
<< 16);
433 kref_get(&cfg
->afu
->mapcount
);
437 nseg
= scsi_dma_map(scp
);
438 if (unlikely(nseg
< 0)) {
439 dev_err(dev
, "%s: Fail DMA map!\n", __func__
);
440 rc
= SCSI_MLQUEUE_HOST_BUSY
;
444 cmd
->rcb
.data_len
= sg_dma_len(sg
);
445 cmd
->rcb
.data_ea
= sg_dma_address(sg
);
451 cmd
->rcb
.ctx_id
= afu
->ctx_hndl
;
452 cmd
->rcb
.msi
= SISL_MSI_RRQ_UPDATED
;
453 cmd
->rcb
.port_sel
= port_sel
;
454 cmd
->rcb
.lun_id
= lun_to_lunid(scp
->device
->lun
);
456 if (scp
->sc_data_direction
== DMA_TO_DEVICE
)
457 req_flags
|= SISL_REQ_FLAGS_HOST_WRITE
;
459 cmd
->rcb
.req_flags
= req_flags
;
460 memcpy(cmd
->rcb
.cdb
, scp
->cmnd
, sizeof(cmd
->rcb
.cdb
));
462 rc
= afu
->send_cmd(afu
, cmd
);
467 kref_put(&afu
->mapcount
, afu_unmap
);
468 pr_devel("%s: returning rc=%d\n", __func__
, rc
);
473 * cxlflash_wait_for_pci_err_recovery() - wait for error recovery during probe
474 * @cfg: Internal structure associated with the host.
476 static void cxlflash_wait_for_pci_err_recovery(struct cxlflash_cfg
*cfg
)
478 struct pci_dev
*pdev
= cfg
->dev
;
480 if (pci_channel_offline(pdev
))
481 wait_event_timeout(cfg
->reset_waitq
,
482 !pci_channel_offline(pdev
),
483 CXLFLASH_PCI_ERROR_RECOVERY_TIMEOUT
);
487 * free_mem() - free memory associated with the AFU
488 * @cfg: Internal structure associated with the host.
490 static void free_mem(struct cxlflash_cfg
*cfg
)
492 struct afu
*afu
= cfg
->afu
;
495 free_pages((ulong
)afu
, get_order(sizeof(struct afu
)));
501 * stop_afu() - stops the AFU command timers and unmaps the MMIO space
502 * @cfg: Internal structure associated with the host.
504 * Safe to call with AFU in a partially allocated/initialized state.
506 * Waits for any active internal AFU commands to timeout and then unmaps
509 static void stop_afu(struct cxlflash_cfg
*cfg
)
511 struct afu
*afu
= cfg
->afu
;
514 while (atomic_read(&afu
->cmds_active
))
516 if (likely(afu
->afu_map
)) {
517 cxl_psa_unmap((void __iomem
*)afu
->afu_map
);
520 kref_put(&afu
->mapcount
, afu_unmap
);
525 * term_intr() - disables all AFU interrupts
526 * @cfg: Internal structure associated with the host.
527 * @level: Depth of allocation, where to begin waterfall tear down.
529 * Safe to call with AFU/MC in partially allocated/initialized state.
531 static void term_intr(struct cxlflash_cfg
*cfg
, enum undo_level level
)
533 struct afu
*afu
= cfg
->afu
;
534 struct device
*dev
= &cfg
->dev
->dev
;
536 if (!afu
|| !cfg
->mcctx
) {
537 dev_err(dev
, "%s: returning with NULL afu or MC\n", __func__
);
543 cxl_unmap_afu_irq(cfg
->mcctx
, 3, afu
);
545 cxl_unmap_afu_irq(cfg
->mcctx
, 2, afu
);
547 cxl_unmap_afu_irq(cfg
->mcctx
, 1, afu
);
549 cxl_free_afu_irqs(cfg
->mcctx
);
552 /* No action required */
558 * term_mc() - terminates the master context
559 * @cfg: Internal structure associated with the host.
560 * @level: Depth of allocation, where to begin waterfall tear down.
562 * Safe to call with AFU/MC in partially allocated/initialized state.
564 static void term_mc(struct cxlflash_cfg
*cfg
)
567 struct afu
*afu
= cfg
->afu
;
568 struct device
*dev
= &cfg
->dev
->dev
;
570 if (!afu
|| !cfg
->mcctx
) {
571 dev_err(dev
, "%s: returning with NULL afu or MC\n", __func__
);
575 rc
= cxl_stop_context(cfg
->mcctx
);
581 * term_afu() - terminates the AFU
582 * @cfg: Internal structure associated with the host.
584 * Safe to call with AFU/MC in partially allocated/initialized state.
586 static void term_afu(struct cxlflash_cfg
*cfg
)
589 * Tear down is carefully orchestrated to ensure
590 * no interrupts can come in when the problem state
593 * 1) Disable all AFU interrupts
594 * 2) Unmap the problem state area
595 * 3) Stop the master context
597 term_intr(cfg
, UNMAP_THREE
);
603 pr_debug("%s: returning\n", __func__
);
607 * notify_shutdown() - notifies device of pending shutdown
608 * @cfg: Internal structure associated with the host.
609 * @wait: Whether to wait for shutdown processing to complete.
611 * This function will notify the AFU that the adapter is being shutdown
612 * and will wait for shutdown processing to complete if wait is true.
613 * This notification should flush pending I/Os to the device and halt
614 * further I/Os until the next AFU reset is issued and device restarted.
616 static void notify_shutdown(struct cxlflash_cfg
*cfg
, bool wait
)
618 struct afu
*afu
= cfg
->afu
;
619 struct device
*dev
= &cfg
->dev
->dev
;
620 struct sisl_global_map __iomem
*global
;
621 struct dev_dependent_vals
*ddv
;
623 int i
, retry_cnt
= 0;
625 ddv
= (struct dev_dependent_vals
*)cfg
->dev_id
->driver_data
;
626 if (!(ddv
->flags
& CXLFLASH_NOTIFY_SHUTDOWN
))
629 if (!afu
|| !afu
->afu_map
) {
630 dev_dbg(dev
, "%s: The problem state area is not mapped\n",
635 global
= &afu
->afu_map
->global
;
638 for (i
= 0; i
< NUM_FC_PORTS
; i
++) {
639 reg
= readq_be(&global
->fc_regs
[i
][FC_CONFIG2
/ 8]);
640 reg
|= SISL_FC_SHUTDOWN_NORMAL
;
641 writeq_be(reg
, &global
->fc_regs
[i
][FC_CONFIG2
/ 8]);
647 /* Wait up to 1.5 seconds for shutdown processing to complete */
648 for (i
= 0; i
< NUM_FC_PORTS
; i
++) {
651 status
= readq_be(&global
->fc_regs
[i
][FC_STATUS
/ 8]);
652 if (status
& SISL_STATUS_SHUTDOWN_COMPLETE
)
654 if (++retry_cnt
>= MC_RETRY_CNT
) {
655 dev_dbg(dev
, "%s: port %d shutdown processing "
656 "not yet completed\n", __func__
, i
);
659 msleep(100 * retry_cnt
);
665 * cxlflash_remove() - PCI entry point to tear down host
666 * @pdev: PCI device associated with the host.
668 * Safe to use as a cleanup in partially allocated/initialized state.
670 static void cxlflash_remove(struct pci_dev
*pdev
)
672 struct cxlflash_cfg
*cfg
= pci_get_drvdata(pdev
);
675 if (!pci_is_enabled(pdev
)) {
676 pr_debug("%s: Device is disabled\n", __func__
);
680 /* If a Task Management Function is active, wait for it to complete
681 * before continuing with remove.
683 spin_lock_irqsave(&cfg
->tmf_slock
, lock_flags
);
685 wait_event_interruptible_lock_irq(cfg
->tmf_waitq
,
688 spin_unlock_irqrestore(&cfg
->tmf_slock
, lock_flags
);
690 /* Notify AFU and wait for shutdown processing to complete */
691 notify_shutdown(cfg
, true);
693 cfg
->state
= STATE_FAILTERM
;
694 cxlflash_stop_term_user_contexts(cfg
);
696 switch (cfg
->init_state
) {
697 case INIT_STATE_SCSI
:
698 cxlflash_term_local_luns(cfg
);
699 scsi_remove_host(cfg
->host
);
702 cancel_work_sync(&cfg
->work_q
);
705 pci_disable_device(pdev
);
706 case INIT_STATE_NONE
:
708 scsi_host_put(cfg
->host
);
712 pr_debug("%s: returning\n", __func__
);
716 * alloc_mem() - allocates the AFU and its command pool
717 * @cfg: Internal structure associated with the host.
719 * A partially allocated state remains on failure.
723 * -ENOMEM on failure to allocate memory
725 static int alloc_mem(struct cxlflash_cfg
*cfg
)
728 struct device
*dev
= &cfg
->dev
->dev
;
730 /* AFU is ~12k, i.e. only one 64k page or up to four 4k pages */
731 cfg
->afu
= (void *)__get_free_pages(GFP_KERNEL
| __GFP_ZERO
,
732 get_order(sizeof(struct afu
)));
733 if (unlikely(!cfg
->afu
)) {
734 dev_err(dev
, "%s: cannot get %d free pages\n",
735 __func__
, get_order(sizeof(struct afu
)));
739 cfg
->afu
->parent
= cfg
;
740 cfg
->afu
->afu_map
= NULL
;
746 * init_pci() - initializes the host as a PCI device
747 * @cfg: Internal structure associated with the host.
749 * Return: 0 on success, -errno on failure
751 static int init_pci(struct cxlflash_cfg
*cfg
)
753 struct pci_dev
*pdev
= cfg
->dev
;
756 rc
= pci_enable_device(pdev
);
757 if (rc
|| pci_channel_offline(pdev
)) {
758 if (pci_channel_offline(pdev
)) {
759 cxlflash_wait_for_pci_err_recovery(cfg
);
760 rc
= pci_enable_device(pdev
);
764 dev_err(&pdev
->dev
, "%s: Cannot enable adapter\n",
766 cxlflash_wait_for_pci_err_recovery(cfg
);
772 pr_debug("%s: returning rc=%d\n", __func__
, rc
);
777 * init_scsi() - adds the host to the SCSI stack and kicks off host scan
778 * @cfg: Internal structure associated with the host.
780 * Return: 0 on success, -errno on failure
782 static int init_scsi(struct cxlflash_cfg
*cfg
)
784 struct pci_dev
*pdev
= cfg
->dev
;
787 rc
= scsi_add_host(cfg
->host
, &pdev
->dev
);
789 dev_err(&pdev
->dev
, "%s: scsi_add_host failed (rc=%d)\n",
794 scsi_scan_host(cfg
->host
);
797 pr_debug("%s: returning rc=%d\n", __func__
, rc
);
802 * set_port_online() - transitions the specified host FC port to online state
803 * @fc_regs: Top of MMIO region defined for specified port.
805 * The provided MMIO region must be mapped prior to call. Online state means
806 * that the FC link layer has synced, completed the handshaking process, and
807 * is ready for login to start.
809 static void set_port_online(__be64 __iomem
*fc_regs
)
813 cmdcfg
= readq_be(&fc_regs
[FC_MTIP_CMDCONFIG
/ 8]);
814 cmdcfg
&= (~FC_MTIP_CMDCONFIG_OFFLINE
); /* clear OFF_LINE */
815 cmdcfg
|= (FC_MTIP_CMDCONFIG_ONLINE
); /* set ON_LINE */
816 writeq_be(cmdcfg
, &fc_regs
[FC_MTIP_CMDCONFIG
/ 8]);
820 * set_port_offline() - transitions the specified host FC port to offline state
821 * @fc_regs: Top of MMIO region defined for specified port.
823 * The provided MMIO region must be mapped prior to call.
825 static void set_port_offline(__be64 __iomem
*fc_regs
)
829 cmdcfg
= readq_be(&fc_regs
[FC_MTIP_CMDCONFIG
/ 8]);
830 cmdcfg
&= (~FC_MTIP_CMDCONFIG_ONLINE
); /* clear ON_LINE */
831 cmdcfg
|= (FC_MTIP_CMDCONFIG_OFFLINE
); /* set OFF_LINE */
832 writeq_be(cmdcfg
, &fc_regs
[FC_MTIP_CMDCONFIG
/ 8]);
836 * wait_port_online() - waits for the specified host FC port come online
837 * @fc_regs: Top of MMIO region defined for specified port.
838 * @delay_us: Number of microseconds to delay between reading port status.
839 * @nretry: Number of cycles to retry reading port status.
841 * The provided MMIO region must be mapped prior to call. This will timeout
842 * when the cable is not plugged in.
845 * TRUE (1) when the specified port is online
846 * FALSE (0) when the specified port fails to come online after timeout
847 * -EINVAL when @delay_us is less than 1000
849 static int wait_port_online(__be64 __iomem
*fc_regs
, u32 delay_us
, u32 nretry
)
853 if (delay_us
< 1000) {
854 pr_err("%s: invalid delay specified %d\n", __func__
, delay_us
);
859 msleep(delay_us
/ 1000);
860 status
= readq_be(&fc_regs
[FC_MTIP_STATUS
/ 8]);
861 if (status
== U64_MAX
)
863 } while ((status
& FC_MTIP_STATUS_MASK
) != FC_MTIP_STATUS_ONLINE
&&
866 return ((status
& FC_MTIP_STATUS_MASK
) == FC_MTIP_STATUS_ONLINE
);
870 * wait_port_offline() - waits for the specified host FC port go offline
871 * @fc_regs: Top of MMIO region defined for specified port.
872 * @delay_us: Number of microseconds to delay between reading port status.
873 * @nretry: Number of cycles to retry reading port status.
875 * The provided MMIO region must be mapped prior to call.
878 * TRUE (1) when the specified port is offline
879 * FALSE (0) when the specified port fails to go offline after timeout
880 * -EINVAL when @delay_us is less than 1000
882 static int wait_port_offline(__be64 __iomem
*fc_regs
, u32 delay_us
, u32 nretry
)
886 if (delay_us
< 1000) {
887 pr_err("%s: invalid delay specified %d\n", __func__
, delay_us
);
892 msleep(delay_us
/ 1000);
893 status
= readq_be(&fc_regs
[FC_MTIP_STATUS
/ 8]);
894 if (status
== U64_MAX
)
896 } while ((status
& FC_MTIP_STATUS_MASK
) != FC_MTIP_STATUS_OFFLINE
&&
899 return ((status
& FC_MTIP_STATUS_MASK
) == FC_MTIP_STATUS_OFFLINE
);
903 * afu_set_wwpn() - configures the WWPN for the specified host FC port
904 * @afu: AFU associated with the host that owns the specified FC port.
905 * @port: Port number being configured.
906 * @fc_regs: Top of MMIO region defined for specified port.
907 * @wwpn: The world-wide-port-number previously discovered for port.
909 * The provided MMIO region must be mapped prior to call. As part of the
910 * sequence to configure the WWPN, the port is toggled offline and then back
911 * online. This toggling action can cause this routine to delay up to a few
912 * seconds. When configured to use the internal LUN feature of the AFU, a
913 * failure to come online is overridden.
915 static void afu_set_wwpn(struct afu
*afu
, int port
, __be64 __iomem
*fc_regs
,
918 set_port_offline(fc_regs
);
919 if (!wait_port_offline(fc_regs
, FC_PORT_STATUS_RETRY_INTERVAL_US
,
920 FC_PORT_STATUS_RETRY_CNT
)) {
921 pr_debug("%s: wait on port %d to go offline timed out\n",
925 writeq_be(wwpn
, &fc_regs
[FC_PNAME
/ 8]);
927 set_port_online(fc_regs
);
928 if (!wait_port_online(fc_regs
, FC_PORT_STATUS_RETRY_INTERVAL_US
,
929 FC_PORT_STATUS_RETRY_CNT
)) {
930 pr_debug("%s: wait on port %d to go online timed out\n",
936 * afu_link_reset() - resets the specified host FC port
937 * @afu: AFU associated with the host that owns the specified FC port.
938 * @port: Port number being configured.
939 * @fc_regs: Top of MMIO region defined for specified port.
941 * The provided MMIO region must be mapped prior to call. The sequence to
942 * reset the port involves toggling it offline and then back online. This
943 * action can cause this routine to delay up to a few seconds. An effort
944 * is made to maintain link with the device by switching to host to use
945 * the alternate port exclusively while the reset takes place.
946 * failure to come online is overridden.
948 static void afu_link_reset(struct afu
*afu
, int port
, __be64 __iomem
*fc_regs
)
952 /* first switch the AFU to the other links, if any */
953 port_sel
= readq_be(&afu
->afu_map
->global
.regs
.afu_port_sel
);
954 port_sel
&= ~(1ULL << port
);
955 writeq_be(port_sel
, &afu
->afu_map
->global
.regs
.afu_port_sel
);
956 cxlflash_afu_sync(afu
, 0, 0, AFU_GSYNC
);
958 set_port_offline(fc_regs
);
959 if (!wait_port_offline(fc_regs
, FC_PORT_STATUS_RETRY_INTERVAL_US
,
960 FC_PORT_STATUS_RETRY_CNT
))
961 pr_err("%s: wait on port %d to go offline timed out\n",
964 set_port_online(fc_regs
);
965 if (!wait_port_online(fc_regs
, FC_PORT_STATUS_RETRY_INTERVAL_US
,
966 FC_PORT_STATUS_RETRY_CNT
))
967 pr_err("%s: wait on port %d to go online timed out\n",
970 /* switch back to include this port */
971 port_sel
|= (1ULL << port
);
972 writeq_be(port_sel
, &afu
->afu_map
->global
.regs
.afu_port_sel
);
973 cxlflash_afu_sync(afu
, 0, 0, AFU_GSYNC
);
975 pr_debug("%s: returning port_sel=%lld\n", __func__
, port_sel
);
979 * Asynchronous interrupt information table
981 static const struct asyc_intr_info ainfo
[] = {
982 {SISL_ASTATUS_FC0_OTHER
, "other error", 0, CLR_FC_ERROR
| LINK_RESET
},
983 {SISL_ASTATUS_FC0_LOGO
, "target initiated LOGO", 0, 0},
984 {SISL_ASTATUS_FC0_CRC_T
, "CRC threshold exceeded", 0, LINK_RESET
},
985 {SISL_ASTATUS_FC0_LOGI_R
, "login timed out, retrying", 0, LINK_RESET
},
986 {SISL_ASTATUS_FC0_LOGI_F
, "login failed", 0, CLR_FC_ERROR
},
987 {SISL_ASTATUS_FC0_LOGI_S
, "login succeeded", 0, SCAN_HOST
},
988 {SISL_ASTATUS_FC0_LINK_DN
, "link down", 0, 0},
989 {SISL_ASTATUS_FC0_LINK_UP
, "link up", 0, 0},
990 {SISL_ASTATUS_FC1_OTHER
, "other error", 1, CLR_FC_ERROR
| LINK_RESET
},
991 {SISL_ASTATUS_FC1_LOGO
, "target initiated LOGO", 1, 0},
992 {SISL_ASTATUS_FC1_CRC_T
, "CRC threshold exceeded", 1, LINK_RESET
},
993 {SISL_ASTATUS_FC1_LOGI_R
, "login timed out, retrying", 1, LINK_RESET
},
994 {SISL_ASTATUS_FC1_LOGI_F
, "login failed", 1, CLR_FC_ERROR
},
995 {SISL_ASTATUS_FC1_LOGI_S
, "login succeeded", 1, SCAN_HOST
},
996 {SISL_ASTATUS_FC1_LINK_DN
, "link down", 1, 0},
997 {SISL_ASTATUS_FC1_LINK_UP
, "link up", 1, 0},
998 {0x0, "", 0, 0} /* terminator */
1002 * find_ainfo() - locates and returns asynchronous interrupt information
1003 * @status: Status code set by AFU on error.
1005 * Return: The located information or NULL when the status code is invalid.
1007 static const struct asyc_intr_info
*find_ainfo(u64 status
)
1009 const struct asyc_intr_info
*info
;
1011 for (info
= &ainfo
[0]; info
->status
; info
++)
1012 if (info
->status
== status
)
1019 * afu_err_intr_init() - clears and initializes the AFU for error interrupts
1020 * @afu: AFU associated with the host.
1022 static void afu_err_intr_init(struct afu
*afu
)
1027 /* global async interrupts: AFU clears afu_ctrl on context exit
1028 * if async interrupts were sent to that context. This prevents
1029 * the AFU form sending further async interrupts when
1031 * nobody to receive them.
1035 writeq_be(-1ULL, &afu
->afu_map
->global
.regs
.aintr_mask
);
1036 /* set LISN# to send and point to master context */
1037 reg
= ((u64
) (((afu
->ctx_hndl
<< 8) | SISL_MSI_ASYNC_ERROR
)) << 40);
1039 if (afu
->internal_lun
)
1040 reg
|= 1; /* Bit 63 indicates local lun */
1041 writeq_be(reg
, &afu
->afu_map
->global
.regs
.afu_ctrl
);
1043 writeq_be(-1ULL, &afu
->afu_map
->global
.regs
.aintr_clear
);
1044 /* unmask bits that are of interest */
1045 /* note: afu can send an interrupt after this step */
1046 writeq_be(SISL_ASTATUS_MASK
, &afu
->afu_map
->global
.regs
.aintr_mask
);
1047 /* clear again in case a bit came on after previous clear but before */
1049 writeq_be(-1ULL, &afu
->afu_map
->global
.regs
.aintr_clear
);
1051 /* Clear/Set internal lun bits */
1052 reg
= readq_be(&afu
->afu_map
->global
.fc_regs
[0][FC_CONFIG2
/ 8]);
1053 reg
&= SISL_FC_INTERNAL_MASK
;
1054 if (afu
->internal_lun
)
1055 reg
|= ((u64
)(afu
->internal_lun
- 1) << SISL_FC_INTERNAL_SHIFT
);
1056 writeq_be(reg
, &afu
->afu_map
->global
.fc_regs
[0][FC_CONFIG2
/ 8]);
1058 /* now clear FC errors */
1059 for (i
= 0; i
< NUM_FC_PORTS
; i
++) {
1060 writeq_be(0xFFFFFFFFU
,
1061 &afu
->afu_map
->global
.fc_regs
[i
][FC_ERROR
/ 8]);
1062 writeq_be(0, &afu
->afu_map
->global
.fc_regs
[i
][FC_ERRCAP
/ 8]);
1065 /* sync interrupts for master's IOARRIN write */
1066 /* note that unlike asyncs, there can be no pending sync interrupts */
1067 /* at this time (this is a fresh context and master has not written */
1068 /* IOARRIN yet), so there is nothing to clear. */
1070 /* set LISN#, it is always sent to the context that wrote IOARRIN */
1071 writeq_be(SISL_MSI_SYNC_ERROR
, &afu
->host_map
->ctx_ctrl
);
1072 writeq_be(SISL_ISTATUS_MASK
, &afu
->host_map
->intr_mask
);
1076 * cxlflash_sync_err_irq() - interrupt handler for synchronous errors
1077 * @irq: Interrupt number.
1078 * @data: Private data provided at interrupt registration, the AFU.
1080 * Return: Always return IRQ_HANDLED.
1082 static irqreturn_t
cxlflash_sync_err_irq(int irq
, void *data
)
1084 struct afu
*afu
= (struct afu
*)data
;
1088 reg
= readq_be(&afu
->host_map
->intr_status
);
1089 reg_unmasked
= (reg
& SISL_ISTATUS_UNMASK
);
1091 if (reg_unmasked
== 0UL) {
1092 pr_err("%s: %llX: spurious interrupt, intr_status %016llX\n",
1093 __func__
, (u64
)afu
, reg
);
1094 goto cxlflash_sync_err_irq_exit
;
1097 pr_err("%s: %llX: unexpected interrupt, intr_status %016llX\n",
1098 __func__
, (u64
)afu
, reg
);
1100 writeq_be(reg_unmasked
, &afu
->host_map
->intr_clear
);
1102 cxlflash_sync_err_irq_exit
:
1103 pr_debug("%s: returning rc=%d\n", __func__
, IRQ_HANDLED
);
1108 * cxlflash_rrq_irq() - interrupt handler for read-response queue (normal path)
1109 * @irq: Interrupt number.
1110 * @data: Private data provided at interrupt registration, the AFU.
1112 * Return: Always return IRQ_HANDLED.
1114 static irqreturn_t
cxlflash_rrq_irq(int irq
, void *data
)
1116 struct afu
*afu
= (struct afu
*)data
;
1117 struct afu_cmd
*cmd
;
1118 bool toggle
= afu
->toggle
;
1120 *hrrq_start
= afu
->hrrq_start
,
1121 *hrrq_end
= afu
->hrrq_end
,
1122 *hrrq_curr
= afu
->hrrq_curr
;
1124 /* Process however many RRQ entries that are ready */
1128 if ((entry
& SISL_RESP_HANDLE_T_BIT
) != toggle
)
1131 cmd
= (struct afu_cmd
*)(entry
& ~SISL_RESP_HANDLE_T_BIT
);
1134 /* Advance to next entry or wrap and flip the toggle bit */
1135 if (hrrq_curr
< hrrq_end
)
1138 hrrq_curr
= hrrq_start
;
1139 toggle
^= SISL_RESP_HANDLE_T_BIT
;
1143 afu
->hrrq_curr
= hrrq_curr
;
1144 afu
->toggle
= toggle
;
1150 * cxlflash_async_err_irq() - interrupt handler for asynchronous errors
1151 * @irq: Interrupt number.
1152 * @data: Private data provided at interrupt registration, the AFU.
1154 * Return: Always return IRQ_HANDLED.
1156 static irqreturn_t
cxlflash_async_err_irq(int irq
, void *data
)
1158 struct afu
*afu
= (struct afu
*)data
;
1159 struct cxlflash_cfg
*cfg
= afu
->parent
;
1160 struct device
*dev
= &cfg
->dev
->dev
;
1162 const struct asyc_intr_info
*info
;
1163 struct sisl_global_map __iomem
*global
= &afu
->afu_map
->global
;
1168 reg
= readq_be(&global
->regs
.aintr_status
);
1169 reg_unmasked
= (reg
& SISL_ASTATUS_UNMASK
);
1171 if (reg_unmasked
== 0) {
1172 dev_err(dev
, "%s: spurious interrupt, aintr_status 0x%016llX\n",
1177 /* FYI, it is 'okay' to clear AFU status before FC_ERROR */
1178 writeq_be(reg_unmasked
, &global
->regs
.aintr_clear
);
1180 /* Check each bit that is on */
1181 for (i
= 0; reg_unmasked
; i
++, reg_unmasked
= (reg_unmasked
>> 1)) {
1182 info
= find_ainfo(1ULL << i
);
1183 if (((reg_unmasked
& 0x1) == 0) || !info
)
1188 dev_err(dev
, "%s: FC Port %d -> %s, fc_status 0x%08llX\n",
1189 __func__
, port
, info
->desc
,
1190 readq_be(&global
->fc_regs
[port
][FC_STATUS
/ 8]));
1193 * Do link reset first, some OTHER errors will set FC_ERROR
1194 * again if cleared before or w/o a reset
1196 if (info
->action
& LINK_RESET
) {
1197 dev_err(dev
, "%s: FC Port %d: resetting link\n",
1199 cfg
->lr_state
= LINK_RESET_REQUIRED
;
1200 cfg
->lr_port
= port
;
1201 kref_get(&cfg
->afu
->mapcount
);
1202 schedule_work(&cfg
->work_q
);
1205 if (info
->action
& CLR_FC_ERROR
) {
1206 reg
= readq_be(&global
->fc_regs
[port
][FC_ERROR
/ 8]);
1209 * Since all errors are unmasked, FC_ERROR and FC_ERRCAP
1210 * should be the same and tracing one is sufficient.
1213 dev_err(dev
, "%s: fc %d: clearing fc_error 0x%08llX\n",
1214 __func__
, port
, reg
);
1216 writeq_be(reg
, &global
->fc_regs
[port
][FC_ERROR
/ 8]);
1217 writeq_be(0, &global
->fc_regs
[port
][FC_ERRCAP
/ 8]);
1220 if (info
->action
& SCAN_HOST
) {
1221 atomic_inc(&cfg
->scan_host_needed
);
1222 kref_get(&cfg
->afu
->mapcount
);
1223 schedule_work(&cfg
->work_q
);
1228 dev_dbg(dev
, "%s: returning IRQ_HANDLED, afu=%p\n", __func__
, afu
);
1233 * start_context() - starts the master context
1234 * @cfg: Internal structure associated with the host.
1236 * Return: A success or failure value from CXL services.
1238 static int start_context(struct cxlflash_cfg
*cfg
)
1242 rc
= cxl_start_context(cfg
->mcctx
,
1243 cfg
->afu
->work
.work_element_descriptor
,
1246 pr_debug("%s: returning rc=%d\n", __func__
, rc
);
1251 * read_vpd() - obtains the WWPNs from VPD
1252 * @cfg: Internal structure associated with the host.
1253 * @wwpn: Array of size NUM_FC_PORTS to pass back WWPNs
1255 * Return: 0 on success, -errno on failure
1257 static int read_vpd(struct cxlflash_cfg
*cfg
, u64 wwpn
[])
1259 struct pci_dev
*dev
= cfg
->dev
;
1261 int ro_start
, ro_size
, i
, j
, k
;
1263 char vpd_data
[CXLFLASH_VPD_LEN
];
1264 char tmp_buf
[WWPN_BUF_LEN
] = { 0 };
1265 char *wwpn_vpd_tags
[NUM_FC_PORTS
] = { "V5", "V6" };
1267 /* Get the VPD data from the device */
1268 vpd_size
= cxl_read_adapter_vpd(dev
, vpd_data
, sizeof(vpd_data
));
1269 if (unlikely(vpd_size
<= 0)) {
1270 dev_err(&dev
->dev
, "%s: Unable to read VPD (size = %ld)\n",
1271 __func__
, vpd_size
);
1276 /* Get the read only section offset */
1277 ro_start
= pci_vpd_find_tag(vpd_data
, 0, vpd_size
,
1278 PCI_VPD_LRDT_RO_DATA
);
1279 if (unlikely(ro_start
< 0)) {
1280 dev_err(&dev
->dev
, "%s: VPD Read-only data not found\n",
1286 /* Get the read only section size, cap when extends beyond read VPD */
1287 ro_size
= pci_vpd_lrdt_size(&vpd_data
[ro_start
]);
1289 i
= ro_start
+ PCI_VPD_LRDT_TAG_SIZE
;
1290 if (unlikely((i
+ j
) > vpd_size
)) {
1291 pr_debug("%s: Might need to read more VPD (%d > %ld)\n",
1292 __func__
, (i
+ j
), vpd_size
);
1293 ro_size
= vpd_size
- i
;
1297 * Find the offset of the WWPN tag within the read only
1298 * VPD data and validate the found field (partials are
1299 * no good to us). Convert the ASCII data to an integer
1300 * value. Note that we must copy to a temporary buffer
1301 * because the conversion service requires that the ASCII
1302 * string be terminated.
1304 for (k
= 0; k
< NUM_FC_PORTS
; k
++) {
1306 i
= ro_start
+ PCI_VPD_LRDT_TAG_SIZE
;
1308 i
= pci_vpd_find_info_keyword(vpd_data
, i
, j
, wwpn_vpd_tags
[k
]);
1309 if (unlikely(i
< 0)) {
1310 dev_err(&dev
->dev
, "%s: Port %d WWPN not found "
1311 "in VPD\n", __func__
, k
);
1316 j
= pci_vpd_info_field_size(&vpd_data
[i
]);
1317 i
+= PCI_VPD_INFO_FLD_HDR_SIZE
;
1318 if (unlikely((i
+ j
> vpd_size
) || (j
!= WWPN_LEN
))) {
1319 dev_err(&dev
->dev
, "%s: Port %d WWPN incomplete or "
1326 memcpy(tmp_buf
, &vpd_data
[i
], WWPN_LEN
);
1327 rc
= kstrtoul(tmp_buf
, WWPN_LEN
, (ulong
*)&wwpn
[k
]);
1329 dev_err(&dev
->dev
, "%s: Fail to convert port %d WWPN "
1330 "to integer\n", __func__
, k
);
1337 pr_debug("%s: returning rc=%d\n", __func__
, rc
);
1342 * init_pcr() - initialize the provisioning and control registers
1343 * @cfg: Internal structure associated with the host.
1345 * Also sets up fast access to the mapped registers and initializes AFU
1346 * command fields that never change.
1348 static void init_pcr(struct cxlflash_cfg
*cfg
)
1350 struct afu
*afu
= cfg
->afu
;
1351 struct sisl_ctrl_map __iomem
*ctrl_map
;
1354 for (i
= 0; i
< MAX_CONTEXT
; i
++) {
1355 ctrl_map
= &afu
->afu_map
->ctrls
[i
].ctrl
;
1356 /* Disrupt any clients that could be running */
1357 /* e.g. clients that survived a master restart */
1358 writeq_be(0, &ctrl_map
->rht_start
);
1359 writeq_be(0, &ctrl_map
->rht_cnt_id
);
1360 writeq_be(0, &ctrl_map
->ctx_cap
);
1363 /* Copy frequently used fields into afu */
1364 afu
->ctx_hndl
= (u16
) cxl_process_element(cfg
->mcctx
);
1365 afu
->host_map
= &afu
->afu_map
->hosts
[afu
->ctx_hndl
].host
;
1366 afu
->ctrl_map
= &afu
->afu_map
->ctrls
[afu
->ctx_hndl
].ctrl
;
1368 /* Program the Endian Control for the master context */
1369 writeq_be(SISL_ENDIAN_CTRL
, &afu
->host_map
->endian_ctrl
);
1373 * init_global() - initialize AFU global registers
1374 * @cfg: Internal structure associated with the host.
1376 static int init_global(struct cxlflash_cfg
*cfg
)
1378 struct afu
*afu
= cfg
->afu
;
1379 struct device
*dev
= &cfg
->dev
->dev
;
1380 u64 wwpn
[NUM_FC_PORTS
]; /* wwpn of AFU ports */
1381 int i
= 0, num_ports
= 0;
1385 rc
= read_vpd(cfg
, &wwpn
[0]);
1387 dev_err(dev
, "%s: could not read vpd rc=%d\n", __func__
, rc
);
1391 pr_debug("%s: wwpn0=0x%llX wwpn1=0x%llX\n", __func__
, wwpn
[0], wwpn
[1]);
1393 /* Set up RRQ in AFU for master issued cmds */
1394 writeq_be((u64
) afu
->hrrq_start
, &afu
->host_map
->rrq_start
);
1395 writeq_be((u64
) afu
->hrrq_end
, &afu
->host_map
->rrq_end
);
1397 /* AFU configuration */
1398 reg
= readq_be(&afu
->afu_map
->global
.regs
.afu_config
);
1399 reg
|= SISL_AFUCONF_AR_ALL
|SISL_AFUCONF_ENDIAN
;
1400 /* enable all auto retry options and control endianness */
1401 /* leave others at default: */
1402 /* CTX_CAP write protected, mbox_r does not clear on read and */
1403 /* checker on if dual afu */
1404 writeq_be(reg
, &afu
->afu_map
->global
.regs
.afu_config
);
1406 /* Global port select: select either port */
1407 if (afu
->internal_lun
) {
1408 /* Only use port 0 */
1409 writeq_be(PORT0
, &afu
->afu_map
->global
.regs
.afu_port_sel
);
1410 num_ports
= NUM_FC_PORTS
- 1;
1412 writeq_be(BOTH_PORTS
, &afu
->afu_map
->global
.regs
.afu_port_sel
);
1413 num_ports
= NUM_FC_PORTS
;
1416 for (i
= 0; i
< num_ports
; i
++) {
1417 /* Unmask all errors (but they are still masked at AFU) */
1418 writeq_be(0, &afu
->afu_map
->global
.fc_regs
[i
][FC_ERRMSK
/ 8]);
1419 /* Clear CRC error cnt & set a threshold */
1420 (void)readq_be(&afu
->afu_map
->global
.
1421 fc_regs
[i
][FC_CNT_CRCERR
/ 8]);
1422 writeq_be(MC_CRC_THRESH
, &afu
->afu_map
->global
.fc_regs
[i
]
1423 [FC_CRC_THRESH
/ 8]);
1425 /* Set WWPNs. If already programmed, wwpn[i] is 0 */
1427 afu_set_wwpn(afu
, i
,
1428 &afu
->afu_map
->global
.fc_regs
[i
][0],
1430 /* Programming WWPN back to back causes additional
1431 * offline/online transitions and a PLOGI
1436 /* Set up master's own CTX_CAP to allow real mode, host translation */
1437 /* tables, afu cmds and read/write GSCSI cmds. */
1438 /* First, unlock ctx_cap write by reading mbox */
1439 (void)readq_be(&afu
->ctrl_map
->mbox_r
); /* unlock ctx_cap */
1440 writeq_be((SISL_CTX_CAP_REAL_MODE
| SISL_CTX_CAP_HOST_XLATE
|
1441 SISL_CTX_CAP_READ_CMD
| SISL_CTX_CAP_WRITE_CMD
|
1442 SISL_CTX_CAP_AFU_CMD
| SISL_CTX_CAP_GSCSI_CMD
),
1443 &afu
->ctrl_map
->ctx_cap
);
1444 /* Initialize heartbeat */
1445 afu
->hb
= readq_be(&afu
->afu_map
->global
.regs
.afu_hb
);
1452 * start_afu() - initializes and starts the AFU
1453 * @cfg: Internal structure associated with the host.
1455 static int start_afu(struct cxlflash_cfg
*cfg
)
1457 struct afu
*afu
= cfg
->afu
;
1462 /* After an AFU reset, RRQ entries are stale, clear them */
1463 memset(&afu
->rrq_entry
, 0, sizeof(afu
->rrq_entry
));
1465 /* Initialize RRQ pointers */
1466 afu
->hrrq_start
= &afu
->rrq_entry
[0];
1467 afu
->hrrq_end
= &afu
->rrq_entry
[NUM_RRQ_ENTRY
- 1];
1468 afu
->hrrq_curr
= afu
->hrrq_start
;
1471 rc
= init_global(cfg
);
1473 pr_debug("%s: returning rc=%d\n", __func__
, rc
);
1478 * init_intr() - setup interrupt handlers for the master context
1479 * @cfg: Internal structure associated with the host.
1481 * Return: 0 on success, -errno on failure
1483 static enum undo_level
init_intr(struct cxlflash_cfg
*cfg
,
1484 struct cxl_context
*ctx
)
1486 struct afu
*afu
= cfg
->afu
;
1487 struct device
*dev
= &cfg
->dev
->dev
;
1489 enum undo_level level
= UNDO_NOOP
;
1491 rc
= cxl_allocate_afu_irqs(ctx
, 3);
1493 dev_err(dev
, "%s: call to allocate_afu_irqs failed rc=%d!\n",
1499 rc
= cxl_map_afu_irq(ctx
, 1, cxlflash_sync_err_irq
, afu
,
1500 "SISL_MSI_SYNC_ERROR");
1501 if (unlikely(rc
<= 0)) {
1502 dev_err(dev
, "%s: IRQ 1 (SISL_MSI_SYNC_ERROR) map failed!\n",
1508 rc
= cxl_map_afu_irq(ctx
, 2, cxlflash_rrq_irq
, afu
,
1509 "SISL_MSI_RRQ_UPDATED");
1510 if (unlikely(rc
<= 0)) {
1511 dev_err(dev
, "%s: IRQ 2 (SISL_MSI_RRQ_UPDATED) map failed!\n",
1517 rc
= cxl_map_afu_irq(ctx
, 3, cxlflash_async_err_irq
, afu
,
1518 "SISL_MSI_ASYNC_ERROR");
1519 if (unlikely(rc
<= 0)) {
1520 dev_err(dev
, "%s: IRQ 3 (SISL_MSI_ASYNC_ERROR) map failed!\n",
1530 * init_mc() - create and register as the master context
1531 * @cfg: Internal structure associated with the host.
1533 * Return: 0 on success, -errno on failure
1535 static int init_mc(struct cxlflash_cfg
*cfg
)
1537 struct cxl_context
*ctx
;
1538 struct device
*dev
= &cfg
->dev
->dev
;
1540 enum undo_level level
;
1542 ctx
= cxl_get_context(cfg
->dev
);
1543 if (unlikely(!ctx
)) {
1549 /* Set it up as a master with the CXL */
1550 cxl_set_master(ctx
);
1552 /* During initialization reset the AFU to start from a clean slate */
1553 rc
= cxl_afu_reset(cfg
->mcctx
);
1555 dev_err(dev
, "%s: initial AFU reset failed rc=%d\n",
1560 level
= init_intr(cfg
, ctx
);
1561 if (unlikely(level
)) {
1562 dev_err(dev
, "%s: setting up interrupts failed rc=%d\n",
1567 /* This performs the equivalent of the CXL_IOCTL_START_WORK.
1568 * The CXL_IOCTL_GET_PROCESS_ELEMENT is implicit in the process
1569 * element (pe) that is embedded in the context (ctx)
1571 rc
= start_context(cfg
);
1573 dev_err(dev
, "%s: start context failed rc=%d\n", __func__
, rc
);
1574 level
= UNMAP_THREE
;
1578 pr_debug("%s: returning rc=%d\n", __func__
, rc
);
1581 term_intr(cfg
, level
);
1586 * init_afu() - setup as master context and start AFU
1587 * @cfg: Internal structure associated with the host.
1589 * This routine is a higher level of control for configuring the
1590 * AFU on probe and reset paths.
1592 * Return: 0 on success, -errno on failure
1594 static int init_afu(struct cxlflash_cfg
*cfg
)
1598 struct afu
*afu
= cfg
->afu
;
1599 struct device
*dev
= &cfg
->dev
->dev
;
1601 cxl_perst_reloads_same_image(cfg
->cxl_afu
, true);
1605 dev_err(dev
, "%s: call to init_mc failed, rc=%d!\n",
1610 /* Map the entire MMIO space of the AFU */
1611 afu
->afu_map
= cxl_psa_map(cfg
->mcctx
);
1612 if (!afu
->afu_map
) {
1613 dev_err(dev
, "%s: call to cxl_psa_map failed!\n", __func__
);
1617 kref_init(&afu
->mapcount
);
1619 /* No byte reverse on reading afu_version or string will be backwards */
1620 reg
= readq(&afu
->afu_map
->global
.regs
.afu_version
);
1621 memcpy(afu
->version
, ®
, sizeof(reg
));
1622 afu
->interface_version
=
1623 readq_be(&afu
->afu_map
->global
.regs
.interface_version
);
1624 if ((afu
->interface_version
+ 1) == 0) {
1625 pr_err("Back level AFU, please upgrade. AFU version %s "
1626 "interface version 0x%llx\n", afu
->version
,
1627 afu
->interface_version
);
1632 afu
->send_cmd
= send_cmd_ioarrin
;
1633 afu
->context_reset
= context_reset_ioarrin
;
1635 pr_debug("%s: afu version %s, interface version 0x%llX\n", __func__
,
1636 afu
->version
, afu
->interface_version
);
1638 rc
= start_afu(cfg
);
1640 dev_err(dev
, "%s: call to start_afu failed, rc=%d!\n",
1645 afu_err_intr_init(cfg
->afu
);
1646 spin_lock_init(&afu
->rrin_slock
);
1647 afu
->room
= readq_be(&afu
->host_map
->cmd_room
);
1649 /* Restore the LUN mappings */
1650 cxlflash_restore_luntable(cfg
);
1652 pr_debug("%s: returning rc=%d\n", __func__
, rc
);
1656 kref_put(&afu
->mapcount
, afu_unmap
);
1658 term_intr(cfg
, UNMAP_THREE
);
1664 * cxlflash_afu_sync() - builds and sends an AFU sync command
1665 * @afu: AFU associated with the host.
1666 * @ctx_hndl_u: Identifies context requesting sync.
1667 * @res_hndl_u: Identifies resource requesting sync.
1668 * @mode: Type of sync to issue (lightweight, heavyweight, global).
1670 * The AFU can only take 1 sync command at a time. This routine enforces this
1671 * limitation by using a mutex to provide exclusive access to the AFU during
1672 * the sync. This design point requires calling threads to not be on interrupt
1673 * context due to the possibility of sleeping during concurrent sync operations.
1675 * AFU sync operations are only necessary and allowed when the device is
1676 * operating normally. When not operating normally, sync requests can occur as
1677 * part of cleaning up resources associated with an adapter prior to removal.
1678 * In this scenario, these requests are simply ignored (safe due to the AFU
1685 int cxlflash_afu_sync(struct afu
*afu
, ctx_hndl_t ctx_hndl_u
,
1686 res_hndl_t res_hndl_u
, u8 mode
)
1688 struct cxlflash_cfg
*cfg
= afu
->parent
;
1689 struct device
*dev
= &cfg
->dev
->dev
;
1690 struct afu_cmd
*cmd
= NULL
;
1693 static DEFINE_MUTEX(sync_active
);
1695 if (cfg
->state
!= STATE_NORMAL
) {
1696 pr_debug("%s: Sync not required! (%u)\n", __func__
, cfg
->state
);
1700 mutex_lock(&sync_active
);
1701 atomic_inc(&afu
->cmds_active
);
1702 buf
= kzalloc(sizeof(*cmd
) + __alignof__(*cmd
) - 1, GFP_KERNEL
);
1703 if (unlikely(!buf
)) {
1704 dev_err(dev
, "%s: no memory for command\n", __func__
);
1709 cmd
= (struct afu_cmd
*)PTR_ALIGN(buf
, __alignof__(*cmd
));
1710 init_completion(&cmd
->cevent
);
1713 pr_debug("%s: afu=%p cmd=%p %d\n", __func__
, afu
, cmd
, ctx_hndl_u
);
1715 cmd
->rcb
.req_flags
= SISL_REQ_FLAGS_AFU_CMD
;
1716 cmd
->rcb
.ctx_id
= afu
->ctx_hndl
;
1717 cmd
->rcb
.msi
= SISL_MSI_RRQ_UPDATED
;
1718 cmd
->rcb
.timeout
= MC_AFU_SYNC_TIMEOUT
;
1720 cmd
->rcb
.cdb
[0] = 0xC0; /* AFU Sync */
1721 cmd
->rcb
.cdb
[1] = mode
;
1723 /* The cdb is aligned, no unaligned accessors required */
1724 *((__be16
*)&cmd
->rcb
.cdb
[2]) = cpu_to_be16(ctx_hndl_u
);
1725 *((__be32
*)&cmd
->rcb
.cdb
[4]) = cpu_to_be32(res_hndl_u
);
1727 rc
= afu
->send_cmd(afu
, cmd
);
1731 rc
= wait_resp(afu
, cmd
);
1735 atomic_dec(&afu
->cmds_active
);
1736 mutex_unlock(&sync_active
);
1738 pr_debug("%s: returning rc=%d\n", __func__
, rc
);
1743 * afu_reset() - resets the AFU
1744 * @cfg: Internal structure associated with the host.
1746 * Return: 0 on success, -errno on failure
1748 static int afu_reset(struct cxlflash_cfg
*cfg
)
1751 /* Stop the context before the reset. Since the context is
1752 * no longer available restart it after the reset is complete
1759 pr_debug("%s: returning rc=%d\n", __func__
, rc
);
1764 * drain_ioctls() - wait until all currently executing ioctls have completed
1765 * @cfg: Internal structure associated with the host.
1767 * Obtain write access to read/write semaphore that wraps ioctl
1768 * handling to 'drain' ioctls currently executing.
1770 static void drain_ioctls(struct cxlflash_cfg
*cfg
)
1772 down_write(&cfg
->ioctl_rwsem
);
1773 up_write(&cfg
->ioctl_rwsem
);
1777 * cxlflash_eh_device_reset_handler() - reset a single LUN
1778 * @scp: SCSI command to send.
1781 * SUCCESS as defined in scsi/scsi.h
1782 * FAILED as defined in scsi/scsi.h
1784 static int cxlflash_eh_device_reset_handler(struct scsi_cmnd
*scp
)
1787 struct Scsi_Host
*host
= scp
->device
->host
;
1788 struct cxlflash_cfg
*cfg
= (struct cxlflash_cfg
*)host
->hostdata
;
1789 struct afu
*afu
= cfg
->afu
;
1792 pr_debug("%s: (scp=%p) %d/%d/%d/%llu "
1793 "cdb=(%08X-%08X-%08X-%08X)\n", __func__
, scp
,
1794 host
->host_no
, scp
->device
->channel
,
1795 scp
->device
->id
, scp
->device
->lun
,
1796 get_unaligned_be32(&((u32
*)scp
->cmnd
)[0]),
1797 get_unaligned_be32(&((u32
*)scp
->cmnd
)[1]),
1798 get_unaligned_be32(&((u32
*)scp
->cmnd
)[2]),
1799 get_unaligned_be32(&((u32
*)scp
->cmnd
)[3]));
1802 switch (cfg
->state
) {
1804 rcr
= send_tmf(afu
, scp
, TMF_LUN_RESET
);
1809 wait_event(cfg
->reset_waitq
, cfg
->state
!= STATE_RESET
);
1816 pr_debug("%s: returning rc=%d\n", __func__
, rc
);
1821 * cxlflash_eh_host_reset_handler() - reset the host adapter
1822 * @scp: SCSI command from stack identifying host.
1824 * Following a reset, the state is evaluated again in case an EEH occurred
1825 * during the reset. In such a scenario, the host reset will either yield
1826 * until the EEH recovery is complete or return success or failure based
1827 * upon the current device state.
1830 * SUCCESS as defined in scsi/scsi.h
1831 * FAILED as defined in scsi/scsi.h
1833 static int cxlflash_eh_host_reset_handler(struct scsi_cmnd
*scp
)
1837 struct Scsi_Host
*host
= scp
->device
->host
;
1838 struct cxlflash_cfg
*cfg
= (struct cxlflash_cfg
*)host
->hostdata
;
1840 pr_debug("%s: (scp=%p) %d/%d/%d/%llu "
1841 "cdb=(%08X-%08X-%08X-%08X)\n", __func__
, scp
,
1842 host
->host_no
, scp
->device
->channel
,
1843 scp
->device
->id
, scp
->device
->lun
,
1844 get_unaligned_be32(&((u32
*)scp
->cmnd
)[0]),
1845 get_unaligned_be32(&((u32
*)scp
->cmnd
)[1]),
1846 get_unaligned_be32(&((u32
*)scp
->cmnd
)[2]),
1847 get_unaligned_be32(&((u32
*)scp
->cmnd
)[3]));
1849 switch (cfg
->state
) {
1851 cfg
->state
= STATE_RESET
;
1853 cxlflash_mark_contexts_error(cfg
);
1854 rcr
= afu_reset(cfg
);
1857 cfg
->state
= STATE_FAILTERM
;
1859 cfg
->state
= STATE_NORMAL
;
1860 wake_up_all(&cfg
->reset_waitq
);
1864 wait_event(cfg
->reset_waitq
, cfg
->state
!= STATE_RESET
);
1865 if (cfg
->state
== STATE_NORMAL
)
1873 pr_debug("%s: returning rc=%d\n", __func__
, rc
);
1878 * cxlflash_change_queue_depth() - change the queue depth for the device
1879 * @sdev: SCSI device destined for queue depth change.
1880 * @qdepth: Requested queue depth value to set.
1882 * The requested queue depth is capped to the maximum supported value.
1884 * Return: The actual queue depth set.
1886 static int cxlflash_change_queue_depth(struct scsi_device
*sdev
, int qdepth
)
1889 if (qdepth
> CXLFLASH_MAX_CMDS_PER_LUN
)
1890 qdepth
= CXLFLASH_MAX_CMDS_PER_LUN
;
1892 scsi_change_queue_depth(sdev
, qdepth
);
1893 return sdev
->queue_depth
;
1897 * cxlflash_show_port_status() - queries and presents the current port status
1898 * @port: Desired port for status reporting.
1899 * @afu: AFU owning the specified port.
1900 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
1902 * Return: The size of the ASCII string returned in @buf.
1904 static ssize_t
cxlflash_show_port_status(u32 port
, struct afu
*afu
, char *buf
)
1908 __be64 __iomem
*fc_regs
;
1910 if (port
>= NUM_FC_PORTS
)
1913 fc_regs
= &afu
->afu_map
->global
.fc_regs
[port
][0];
1914 status
= readq_be(&fc_regs
[FC_MTIP_STATUS
/ 8]);
1915 status
&= FC_MTIP_STATUS_MASK
;
1917 if (status
== FC_MTIP_STATUS_ONLINE
)
1918 disp_status
= "online";
1919 else if (status
== FC_MTIP_STATUS_OFFLINE
)
1920 disp_status
= "offline";
1922 disp_status
= "unknown";
1924 return scnprintf(buf
, PAGE_SIZE
, "%s\n", disp_status
);
1928 * port0_show() - queries and presents the current status of port 0
1929 * @dev: Generic device associated with the host owning the port.
1930 * @attr: Device attribute representing the port.
1931 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
1933 * Return: The size of the ASCII string returned in @buf.
1935 static ssize_t
port0_show(struct device
*dev
,
1936 struct device_attribute
*attr
,
1939 struct Scsi_Host
*shost
= class_to_shost(dev
);
1940 struct cxlflash_cfg
*cfg
= (struct cxlflash_cfg
*)shost
->hostdata
;
1941 struct afu
*afu
= cfg
->afu
;
1943 return cxlflash_show_port_status(0, afu
, buf
);
1947 * port1_show() - queries and presents the current status of port 1
1948 * @dev: Generic device associated with the host owning the port.
1949 * @attr: Device attribute representing the port.
1950 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
1952 * Return: The size of the ASCII string returned in @buf.
1954 static ssize_t
port1_show(struct device
*dev
,
1955 struct device_attribute
*attr
,
1958 struct Scsi_Host
*shost
= class_to_shost(dev
);
1959 struct cxlflash_cfg
*cfg
= (struct cxlflash_cfg
*)shost
->hostdata
;
1960 struct afu
*afu
= cfg
->afu
;
1962 return cxlflash_show_port_status(1, afu
, buf
);
1966 * lun_mode_show() - presents the current LUN mode of the host
1967 * @dev: Generic device associated with the host.
1968 * @attr: Device attribute representing the LUN mode.
1969 * @buf: Buffer of length PAGE_SIZE to report back the LUN mode in ASCII.
1971 * Return: The size of the ASCII string returned in @buf.
1973 static ssize_t
lun_mode_show(struct device
*dev
,
1974 struct device_attribute
*attr
, char *buf
)
1976 struct Scsi_Host
*shost
= class_to_shost(dev
);
1977 struct cxlflash_cfg
*cfg
= (struct cxlflash_cfg
*)shost
->hostdata
;
1978 struct afu
*afu
= cfg
->afu
;
1980 return scnprintf(buf
, PAGE_SIZE
, "%u\n", afu
->internal_lun
);
1984 * lun_mode_store() - sets the LUN mode of the host
1985 * @dev: Generic device associated with the host.
1986 * @attr: Device attribute representing the LUN mode.
1987 * @buf: Buffer of length PAGE_SIZE containing the LUN mode in ASCII.
1988 * @count: Length of data resizing in @buf.
1990 * The CXL Flash AFU supports a dummy LUN mode where the external
1991 * links and storage are not required. Space on the FPGA is used
1992 * to create 1 or 2 small LUNs which are presented to the system
1993 * as if they were a normal storage device. This feature is useful
1994 * during development and also provides manufacturing with a way
1995 * to test the AFU without an actual device.
1997 * 0 = external LUN[s] (default)
1998 * 1 = internal LUN (1 x 64K, 512B blocks, id 0)
1999 * 2 = internal LUN (1 x 64K, 4K blocks, id 0)
2000 * 3 = internal LUN (2 x 32K, 512B blocks, ids 0,1)
2001 * 4 = internal LUN (2 x 32K, 4K blocks, ids 0,1)
2003 * Return: The size of the ASCII string returned in @buf.
2005 static ssize_t
lun_mode_store(struct device
*dev
,
2006 struct device_attribute
*attr
,
2007 const char *buf
, size_t count
)
2009 struct Scsi_Host
*shost
= class_to_shost(dev
);
2010 struct cxlflash_cfg
*cfg
= (struct cxlflash_cfg
*)shost
->hostdata
;
2011 struct afu
*afu
= cfg
->afu
;
2015 rc
= kstrtouint(buf
, 10, &lun_mode
);
2016 if (!rc
&& (lun_mode
< 5) && (lun_mode
!= afu
->internal_lun
)) {
2017 afu
->internal_lun
= lun_mode
;
2020 * When configured for internal LUN, there is only one channel,
2021 * channel number 0, else there will be 2 (default).
2023 if (afu
->internal_lun
)
2024 shost
->max_channel
= 0;
2026 shost
->max_channel
= NUM_FC_PORTS
- 1;
2029 scsi_scan_host(cfg
->host
);
2036 * ioctl_version_show() - presents the current ioctl version of the host
2037 * @dev: Generic device associated with the host.
2038 * @attr: Device attribute representing the ioctl version.
2039 * @buf: Buffer of length PAGE_SIZE to report back the ioctl version.
2041 * Return: The size of the ASCII string returned in @buf.
2043 static ssize_t
ioctl_version_show(struct device
*dev
,
2044 struct device_attribute
*attr
, char *buf
)
2046 return scnprintf(buf
, PAGE_SIZE
, "%u\n", DK_CXLFLASH_VERSION_0
);
2050 * cxlflash_show_port_lun_table() - queries and presents the port LUN table
2051 * @port: Desired port for status reporting.
2052 * @afu: AFU owning the specified port.
2053 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
2055 * Return: The size of the ASCII string returned in @buf.
2057 static ssize_t
cxlflash_show_port_lun_table(u32 port
,
2063 __be64 __iomem
*fc_port
;
2065 if (port
>= NUM_FC_PORTS
)
2068 fc_port
= &afu
->afu_map
->global
.fc_port
[port
][0];
2070 for (i
= 0; i
< CXLFLASH_NUM_VLUNS
; i
++)
2071 bytes
+= scnprintf(buf
+ bytes
, PAGE_SIZE
- bytes
,
2072 "%03d: %016llX\n", i
, readq_be(&fc_port
[i
]));
2077 * port0_lun_table_show() - presents the current LUN table of port 0
2078 * @dev: Generic device associated with the host owning the port.
2079 * @attr: Device attribute representing the port.
2080 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
2082 * Return: The size of the ASCII string returned in @buf.
2084 static ssize_t
port0_lun_table_show(struct device
*dev
,
2085 struct device_attribute
*attr
,
2088 struct Scsi_Host
*shost
= class_to_shost(dev
);
2089 struct cxlflash_cfg
*cfg
= (struct cxlflash_cfg
*)shost
->hostdata
;
2090 struct afu
*afu
= cfg
->afu
;
2092 return cxlflash_show_port_lun_table(0, afu
, buf
);
2096 * port1_lun_table_show() - presents the current LUN table of port 1
2097 * @dev: Generic device associated with the host owning the port.
2098 * @attr: Device attribute representing the port.
2099 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
2101 * Return: The size of the ASCII string returned in @buf.
2103 static ssize_t
port1_lun_table_show(struct device
*dev
,
2104 struct device_attribute
*attr
,
2107 struct Scsi_Host
*shost
= class_to_shost(dev
);
2108 struct cxlflash_cfg
*cfg
= (struct cxlflash_cfg
*)shost
->hostdata
;
2109 struct afu
*afu
= cfg
->afu
;
2111 return cxlflash_show_port_lun_table(1, afu
, buf
);
2115 * mode_show() - presents the current mode of the device
2116 * @dev: Generic device associated with the device.
2117 * @attr: Device attribute representing the device mode.
2118 * @buf: Buffer of length PAGE_SIZE to report back the dev mode in ASCII.
2120 * Return: The size of the ASCII string returned in @buf.
2122 static ssize_t
mode_show(struct device
*dev
,
2123 struct device_attribute
*attr
, char *buf
)
2125 struct scsi_device
*sdev
= to_scsi_device(dev
);
2127 return scnprintf(buf
, PAGE_SIZE
, "%s\n",
2128 sdev
->hostdata
? "superpipe" : "legacy");
2134 static DEVICE_ATTR_RO(port0
);
2135 static DEVICE_ATTR_RO(port1
);
2136 static DEVICE_ATTR_RW(lun_mode
);
2137 static DEVICE_ATTR_RO(ioctl_version
);
2138 static DEVICE_ATTR_RO(port0_lun_table
);
2139 static DEVICE_ATTR_RO(port1_lun_table
);
2141 static struct device_attribute
*cxlflash_host_attrs
[] = {
2145 &dev_attr_ioctl_version
,
2146 &dev_attr_port0_lun_table
,
2147 &dev_attr_port1_lun_table
,
2154 static DEVICE_ATTR_RO(mode
);
2156 static struct device_attribute
*cxlflash_dev_attrs
[] = {
2164 static struct scsi_host_template driver_template
= {
2165 .module
= THIS_MODULE
,
2166 .name
= CXLFLASH_ADAPTER_NAME
,
2167 .info
= cxlflash_driver_info
,
2168 .ioctl
= cxlflash_ioctl
,
2169 .proc_name
= CXLFLASH_NAME
,
2170 .queuecommand
= cxlflash_queuecommand
,
2171 .eh_device_reset_handler
= cxlflash_eh_device_reset_handler
,
2172 .eh_host_reset_handler
= cxlflash_eh_host_reset_handler
,
2173 .change_queue_depth
= cxlflash_change_queue_depth
,
2174 .cmd_per_lun
= CXLFLASH_MAX_CMDS_PER_LUN
,
2175 .can_queue
= CXLFLASH_MAX_CMDS
,
2176 .cmd_size
= sizeof(struct afu_cmd
) + __alignof__(struct afu_cmd
) - 1,
2178 .sg_tablesize
= 1, /* No scatter gather support */
2179 .max_sectors
= CXLFLASH_MAX_SECTORS
,
2180 .use_clustering
= ENABLE_CLUSTERING
,
2181 .shost_attrs
= cxlflash_host_attrs
,
2182 .sdev_attrs
= cxlflash_dev_attrs
,
2186 * Device dependent values
2188 static struct dev_dependent_vals dev_corsa_vals
= { CXLFLASH_MAX_SECTORS
,
2190 static struct dev_dependent_vals dev_flash_gt_vals
= { CXLFLASH_MAX_SECTORS
,
2191 CXLFLASH_NOTIFY_SHUTDOWN
};
2194 * PCI device binding table
2196 static struct pci_device_id cxlflash_pci_table
[] = {
2197 {PCI_VENDOR_ID_IBM
, PCI_DEVICE_ID_IBM_CORSA
,
2198 PCI_ANY_ID
, PCI_ANY_ID
, 0, 0, (kernel_ulong_t
)&dev_corsa_vals
},
2199 {PCI_VENDOR_ID_IBM
, PCI_DEVICE_ID_IBM_FLASH_GT
,
2200 PCI_ANY_ID
, PCI_ANY_ID
, 0, 0, (kernel_ulong_t
)&dev_flash_gt_vals
},
2204 MODULE_DEVICE_TABLE(pci
, cxlflash_pci_table
);
2207 * cxlflash_worker_thread() - work thread handler for the AFU
2208 * @work: Work structure contained within cxlflash associated with host.
2210 * Handles the following events:
2211 * - Link reset which cannot be performed on interrupt context due to
2212 * blocking up to a few seconds
2215 static void cxlflash_worker_thread(struct work_struct
*work
)
2217 struct cxlflash_cfg
*cfg
= container_of(work
, struct cxlflash_cfg
,
2219 struct afu
*afu
= cfg
->afu
;
2220 struct device
*dev
= &cfg
->dev
->dev
;
2224 /* Avoid MMIO if the device has failed */
2226 if (cfg
->state
!= STATE_NORMAL
)
2229 spin_lock_irqsave(cfg
->host
->host_lock
, lock_flags
);
2231 if (cfg
->lr_state
== LINK_RESET_REQUIRED
) {
2232 port
= cfg
->lr_port
;
2234 dev_err(dev
, "%s: invalid port index %d\n",
2237 spin_unlock_irqrestore(cfg
->host
->host_lock
,
2240 /* The reset can block... */
2241 afu_link_reset(afu
, port
,
2242 &afu
->afu_map
->global
.fc_regs
[port
][0]);
2243 spin_lock_irqsave(cfg
->host
->host_lock
, lock_flags
);
2246 cfg
->lr_state
= LINK_RESET_COMPLETE
;
2249 spin_unlock_irqrestore(cfg
->host
->host_lock
, lock_flags
);
2251 if (atomic_dec_if_positive(&cfg
->scan_host_needed
) >= 0)
2252 scsi_scan_host(cfg
->host
);
2253 kref_put(&afu
->mapcount
, afu_unmap
);
2257 * cxlflash_probe() - PCI entry point to add host
2258 * @pdev: PCI device associated with the host.
2259 * @dev_id: PCI device id associated with device.
2261 * Return: 0 on success, -errno on failure
2263 static int cxlflash_probe(struct pci_dev
*pdev
,
2264 const struct pci_device_id
*dev_id
)
2266 struct Scsi_Host
*host
;
2267 struct cxlflash_cfg
*cfg
= NULL
;
2268 struct dev_dependent_vals
*ddv
;
2271 dev_dbg(&pdev
->dev
, "%s: Found CXLFLASH with IRQ: %d\n",
2272 __func__
, pdev
->irq
);
2274 ddv
= (struct dev_dependent_vals
*)dev_id
->driver_data
;
2275 driver_template
.max_sectors
= ddv
->max_sectors
;
2277 host
= scsi_host_alloc(&driver_template
, sizeof(struct cxlflash_cfg
));
2279 dev_err(&pdev
->dev
, "%s: call to scsi_host_alloc failed!\n",
2285 host
->max_id
= CXLFLASH_MAX_NUM_TARGETS_PER_BUS
;
2286 host
->max_lun
= CXLFLASH_MAX_NUM_LUNS_PER_TARGET
;
2287 host
->max_channel
= NUM_FC_PORTS
- 1;
2288 host
->unique_id
= host
->host_no
;
2289 host
->max_cmd_len
= CXLFLASH_MAX_CDB_LEN
;
2291 cfg
= (struct cxlflash_cfg
*)host
->hostdata
;
2293 rc
= alloc_mem(cfg
);
2295 dev_err(&pdev
->dev
, "%s: call to alloc_mem failed!\n",
2298 scsi_host_put(cfg
->host
);
2302 cfg
->init_state
= INIT_STATE_NONE
;
2304 cfg
->cxl_fops
= cxlflash_cxl_fops
;
2307 * The promoted LUNs move to the top of the LUN table. The rest stay
2308 * on the bottom half. The bottom half grows from the end
2309 * (index = 255), whereas the top half grows from the beginning
2312 cfg
->promote_lun_index
= 0;
2313 cfg
->last_lun_index
[0] = CXLFLASH_NUM_VLUNS
/2 - 1;
2314 cfg
->last_lun_index
[1] = CXLFLASH_NUM_VLUNS
/2 - 1;
2316 cfg
->dev_id
= (struct pci_device_id
*)dev_id
;
2318 init_waitqueue_head(&cfg
->tmf_waitq
);
2319 init_waitqueue_head(&cfg
->reset_waitq
);
2321 INIT_WORK(&cfg
->work_q
, cxlflash_worker_thread
);
2322 cfg
->lr_state
= LINK_RESET_INVALID
;
2324 spin_lock_init(&cfg
->tmf_slock
);
2325 mutex_init(&cfg
->ctx_tbl_list_mutex
);
2326 mutex_init(&cfg
->ctx_recovery_mutex
);
2327 init_rwsem(&cfg
->ioctl_rwsem
);
2328 INIT_LIST_HEAD(&cfg
->ctx_err_recovery
);
2329 INIT_LIST_HEAD(&cfg
->lluns
);
2331 pci_set_drvdata(pdev
, cfg
);
2333 cfg
->cxl_afu
= cxl_pci_to_afu(pdev
);
2337 dev_err(&pdev
->dev
, "%s: call to init_pci "
2338 "failed rc=%d!\n", __func__
, rc
);
2341 cfg
->init_state
= INIT_STATE_PCI
;
2345 dev_err(&pdev
->dev
, "%s: call to init_afu "
2346 "failed rc=%d!\n", __func__
, rc
);
2349 cfg
->init_state
= INIT_STATE_AFU
;
2351 rc
= init_scsi(cfg
);
2353 dev_err(&pdev
->dev
, "%s: call to init_scsi "
2354 "failed rc=%d!\n", __func__
, rc
);
2357 cfg
->init_state
= INIT_STATE_SCSI
;
2360 pr_debug("%s: returning rc=%d\n", __func__
, rc
);
2364 cxlflash_remove(pdev
);
2369 * cxlflash_pci_error_detected() - called when a PCI error is detected
2370 * @pdev: PCI device struct.
2371 * @state: PCI channel state.
2373 * When an EEH occurs during an active reset, wait until the reset is
2374 * complete and then take action based upon the device state.
2376 * Return: PCI_ERS_RESULT_NEED_RESET or PCI_ERS_RESULT_DISCONNECT
2378 static pci_ers_result_t
cxlflash_pci_error_detected(struct pci_dev
*pdev
,
2379 pci_channel_state_t state
)
2382 struct cxlflash_cfg
*cfg
= pci_get_drvdata(pdev
);
2383 struct device
*dev
= &cfg
->dev
->dev
;
2385 dev_dbg(dev
, "%s: pdev=%p state=%u\n", __func__
, pdev
, state
);
2388 case pci_channel_io_frozen
:
2389 wait_event(cfg
->reset_waitq
, cfg
->state
!= STATE_RESET
);
2390 if (cfg
->state
== STATE_FAILTERM
)
2391 return PCI_ERS_RESULT_DISCONNECT
;
2393 cfg
->state
= STATE_RESET
;
2394 scsi_block_requests(cfg
->host
);
2396 rc
= cxlflash_mark_contexts_error(cfg
);
2398 dev_err(dev
, "%s: Failed to mark user contexts!(%d)\n",
2401 return PCI_ERS_RESULT_NEED_RESET
;
2402 case pci_channel_io_perm_failure
:
2403 cfg
->state
= STATE_FAILTERM
;
2404 wake_up_all(&cfg
->reset_waitq
);
2405 scsi_unblock_requests(cfg
->host
);
2406 return PCI_ERS_RESULT_DISCONNECT
;
2410 return PCI_ERS_RESULT_NEED_RESET
;
2414 * cxlflash_pci_slot_reset() - called when PCI slot has been reset
2415 * @pdev: PCI device struct.
2417 * This routine is called by the pci error recovery code after the PCI
2418 * slot has been reset, just before we should resume normal operations.
2420 * Return: PCI_ERS_RESULT_RECOVERED or PCI_ERS_RESULT_DISCONNECT
2422 static pci_ers_result_t
cxlflash_pci_slot_reset(struct pci_dev
*pdev
)
2425 struct cxlflash_cfg
*cfg
= pci_get_drvdata(pdev
);
2426 struct device
*dev
= &cfg
->dev
->dev
;
2428 dev_dbg(dev
, "%s: pdev=%p\n", __func__
, pdev
);
2432 dev_err(dev
, "%s: EEH recovery failed! (%d)\n", __func__
, rc
);
2433 return PCI_ERS_RESULT_DISCONNECT
;
2436 return PCI_ERS_RESULT_RECOVERED
;
2440 * cxlflash_pci_resume() - called when normal operation can resume
2441 * @pdev: PCI device struct
2443 static void cxlflash_pci_resume(struct pci_dev
*pdev
)
2445 struct cxlflash_cfg
*cfg
= pci_get_drvdata(pdev
);
2446 struct device
*dev
= &cfg
->dev
->dev
;
2448 dev_dbg(dev
, "%s: pdev=%p\n", __func__
, pdev
);
2450 cfg
->state
= STATE_NORMAL
;
2451 wake_up_all(&cfg
->reset_waitq
);
2452 scsi_unblock_requests(cfg
->host
);
2455 static const struct pci_error_handlers cxlflash_err_handler
= {
2456 .error_detected
= cxlflash_pci_error_detected
,
2457 .slot_reset
= cxlflash_pci_slot_reset
,
2458 .resume
= cxlflash_pci_resume
,
2462 * PCI device structure
2464 static struct pci_driver cxlflash_driver
= {
2465 .name
= CXLFLASH_NAME
,
2466 .id_table
= cxlflash_pci_table
,
2467 .probe
= cxlflash_probe
,
2468 .remove
= cxlflash_remove
,
2469 .shutdown
= cxlflash_remove
,
2470 .err_handler
= &cxlflash_err_handler
,
2474 * init_cxlflash() - module entry point
2476 * Return: 0 on success, -errno on failure
2478 static int __init
init_cxlflash(void)
2480 pr_info("%s: %s\n", __func__
, CXLFLASH_ADAPTER_NAME
);
2482 cxlflash_list_init();
2484 return pci_register_driver(&cxlflash_driver
);
2488 * exit_cxlflash() - module exit point
2490 static void __exit
exit_cxlflash(void)
2492 cxlflash_term_global_luns();
2493 cxlflash_free_errpage();
2495 pci_unregister_driver(&cxlflash_driver
);
2498 module_init(init_cxlflash
);
2499 module_exit(exit_cxlflash
);