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");
37 static struct class *cxlflash_class
;
38 static u32 cxlflash_major
;
39 static DECLARE_BITMAP(cxlflash_minor
, CXLFLASH_MAX_ADAPTERS
);
42 * process_cmd_err() - command error handler
43 * @cmd: AFU command that experienced the error.
44 * @scp: SCSI command associated with the AFU command in error.
46 * Translates error bits from AFU command to SCSI command results.
48 static void process_cmd_err(struct afu_cmd
*cmd
, struct scsi_cmnd
*scp
)
50 struct afu
*afu
= cmd
->parent
;
51 struct cxlflash_cfg
*cfg
= afu
->parent
;
52 struct device
*dev
= &cfg
->dev
->dev
;
53 struct sisl_ioarcb
*ioarcb
;
54 struct sisl_ioasa
*ioasa
;
63 if (ioasa
->rc
.flags
& SISL_RC_FLAGS_UNDERRUN
) {
65 scsi_set_resid(scp
, resid
);
66 dev_dbg(dev
, "%s: cmd underrun cmd = %p scp = %p, resid = %d\n",
67 __func__
, cmd
, scp
, resid
);
70 if (ioasa
->rc
.flags
& SISL_RC_FLAGS_OVERRUN
) {
71 dev_dbg(dev
, "%s: cmd underrun cmd = %p scp = %p\n",
73 scp
->result
= (DID_ERROR
<< 16);
76 dev_dbg(dev
, "%s: cmd failed afu_rc=%02x scsi_rc=%02x fc_rc=%02x "
77 "afu_extra=%02x scsi_extra=%02x fc_extra=%02x\n", __func__
,
78 ioasa
->rc
.afu_rc
, ioasa
->rc
.scsi_rc
, ioasa
->rc
.fc_rc
,
79 ioasa
->afu_extra
, ioasa
->scsi_extra
, ioasa
->fc_extra
);
81 if (ioasa
->rc
.scsi_rc
) {
82 /* We have a SCSI status */
83 if (ioasa
->rc
.flags
& SISL_RC_FLAGS_SENSE_VALID
) {
84 memcpy(scp
->sense_buffer
, ioasa
->sense_data
,
86 scp
->result
= ioasa
->rc
.scsi_rc
;
88 scp
->result
= ioasa
->rc
.scsi_rc
| (DID_ERROR
<< 16);
92 * We encountered an error. Set scp->result based on nature
95 if (ioasa
->rc
.fc_rc
) {
96 /* We have an FC status */
97 switch (ioasa
->rc
.fc_rc
) {
98 case SISL_FC_RC_LINKDOWN
:
99 scp
->result
= (DID_REQUEUE
<< 16);
101 case SISL_FC_RC_RESID
:
102 /* This indicates an FCP resid underrun */
103 if (!(ioasa
->rc
.flags
& SISL_RC_FLAGS_OVERRUN
)) {
104 /* If the SISL_RC_FLAGS_OVERRUN flag was set,
105 * then we will handle this error else where.
106 * If not then we must handle it here.
107 * This is probably an AFU bug.
109 scp
->result
= (DID_ERROR
<< 16);
112 case SISL_FC_RC_RESIDERR
:
113 /* Resid mismatch between adapter and device */
114 case SISL_FC_RC_TGTABORT
:
115 case SISL_FC_RC_ABORTOK
:
116 case SISL_FC_RC_ABORTFAIL
:
117 case SISL_FC_RC_NOLOGI
:
118 case SISL_FC_RC_ABORTPEND
:
119 case SISL_FC_RC_WRABORTPEND
:
120 case SISL_FC_RC_NOEXP
:
121 case SISL_FC_RC_INUSE
:
122 scp
->result
= (DID_ERROR
<< 16);
127 if (ioasa
->rc
.afu_rc
) {
128 /* We have an AFU error */
129 switch (ioasa
->rc
.afu_rc
) {
130 case SISL_AFU_RC_NO_CHANNELS
:
131 scp
->result
= (DID_NO_CONNECT
<< 16);
133 case SISL_AFU_RC_DATA_DMA_ERR
:
134 switch (ioasa
->afu_extra
) {
135 case SISL_AFU_DMA_ERR_PAGE_IN
:
137 scp
->result
= (DID_IMM_RETRY
<< 16);
139 case SISL_AFU_DMA_ERR_INVALID_EA
:
141 scp
->result
= (DID_ERROR
<< 16);
144 case SISL_AFU_RC_OUT_OF_DATA_BUFS
:
146 scp
->result
= (DID_ALLOC_FAILURE
<< 16);
149 scp
->result
= (DID_ERROR
<< 16);
155 * cmd_complete() - command completion handler
156 * @cmd: AFU command that has completed.
158 * For SCSI commands this routine prepares and submits commands that have
159 * either completed or timed out to the SCSI stack. For internal commands
160 * (TMF or AFU), this routine simply notifies the originator that the
161 * command has completed.
163 static void cmd_complete(struct afu_cmd
*cmd
)
165 struct scsi_cmnd
*scp
;
167 struct afu
*afu
= cmd
->parent
;
168 struct cxlflash_cfg
*cfg
= afu
->parent
;
169 struct device
*dev
= &cfg
->dev
->dev
;
170 struct hwq
*hwq
= get_hwq(afu
, cmd
->hwq_index
);
172 spin_lock_irqsave(&hwq
->hsq_slock
, lock_flags
);
173 list_del(&cmd
->list
);
174 spin_unlock_irqrestore(&hwq
->hsq_slock
, lock_flags
);
178 if (unlikely(cmd
->sa
.ioasc
))
179 process_cmd_err(cmd
, scp
);
181 scp
->result
= (DID_OK
<< 16);
183 dev_dbg_ratelimited(dev
, "%s:scp=%p result=%08x ioasc=%08x\n",
184 __func__
, scp
, scp
->result
, cmd
->sa
.ioasc
);
186 } else if (cmd
->cmd_tmf
) {
187 spin_lock_irqsave(&cfg
->tmf_slock
, lock_flags
);
188 cfg
->tmf_active
= false;
189 wake_up_all_locked(&cfg
->tmf_waitq
);
190 spin_unlock_irqrestore(&cfg
->tmf_slock
, lock_flags
);
192 complete(&cmd
->cevent
);
196 * flush_pending_cmds() - flush all pending commands on this hardware queue
197 * @hwq: Hardware queue to flush.
199 * The hardware send queue lock associated with this hardware queue must be
200 * held when calling this routine.
202 static void flush_pending_cmds(struct hwq
*hwq
)
204 struct cxlflash_cfg
*cfg
= hwq
->afu
->parent
;
205 struct afu_cmd
*cmd
, *tmp
;
206 struct scsi_cmnd
*scp
;
209 list_for_each_entry_safe(cmd
, tmp
, &hwq
->pending_cmds
, list
) {
210 /* Bypass command when on a doneq, cmd_complete() will handle */
211 if (!list_empty(&cmd
->queue
))
214 list_del(&cmd
->list
);
218 scp
->result
= (DID_IMM_RETRY
<< 16);
221 cmd
->cmd_aborted
= true;
224 spin_lock_irqsave(&cfg
->tmf_slock
, lock_flags
);
225 cfg
->tmf_active
= false;
226 wake_up_all_locked(&cfg
->tmf_waitq
);
227 spin_unlock_irqrestore(&cfg
->tmf_slock
,
230 complete(&cmd
->cevent
);
236 * context_reset() - reset context via specified register
237 * @hwq: Hardware queue owning the context to be reset.
238 * @reset_reg: MMIO register to perform reset.
240 * When the reset is successful, the SISLite specification guarantees that
241 * the AFU has aborted all currently pending I/O. Accordingly, these commands
244 * Return: 0 on success, -errno on failure
246 static int context_reset(struct hwq
*hwq
, __be64 __iomem
*reset_reg
)
248 struct cxlflash_cfg
*cfg
= hwq
->afu
->parent
;
249 struct device
*dev
= &cfg
->dev
->dev
;
255 dev_dbg(dev
, "%s: hwq=%p\n", __func__
, hwq
);
257 spin_lock_irqsave(&hwq
->hsq_slock
, lock_flags
);
259 writeq_be(val
, reset_reg
);
261 val
= readq_be(reset_reg
);
262 if ((val
& 0x1) == 0x0) {
267 /* Double delay each time */
269 } while (nretry
++ < MC_ROOM_RETRY_CNT
);
272 flush_pending_cmds(hwq
);
274 spin_unlock_irqrestore(&hwq
->hsq_slock
, lock_flags
);
276 dev_dbg(dev
, "%s: returning rc=%d, val=%016llx nretry=%d\n",
277 __func__
, rc
, val
, nretry
);
282 * context_reset_ioarrin() - reset context via IOARRIN register
283 * @hwq: Hardware queue owning the context to be reset.
285 * Return: 0 on success, -errno on failure
287 static int context_reset_ioarrin(struct hwq
*hwq
)
289 return context_reset(hwq
, &hwq
->host_map
->ioarrin
);
293 * context_reset_sq() - reset context via SQ_CONTEXT_RESET register
294 * @hwq: Hardware queue owning the context to be reset.
296 * Return: 0 on success, -errno on failure
298 static int context_reset_sq(struct hwq
*hwq
)
300 return context_reset(hwq
, &hwq
->host_map
->sq_ctx_reset
);
304 * send_cmd_ioarrin() - sends an AFU command via IOARRIN register
305 * @afu: AFU associated with the host.
306 * @cmd: AFU command to send.
309 * 0 on success, SCSI_MLQUEUE_HOST_BUSY on failure
311 static int send_cmd_ioarrin(struct afu
*afu
, struct afu_cmd
*cmd
)
313 struct cxlflash_cfg
*cfg
= afu
->parent
;
314 struct device
*dev
= &cfg
->dev
->dev
;
315 struct hwq
*hwq
= get_hwq(afu
, cmd
->hwq_index
);
321 * To avoid the performance penalty of MMIO, spread the update of
322 * 'room' over multiple commands.
324 spin_lock_irqsave(&hwq
->hsq_slock
, lock_flags
);
325 if (--hwq
->room
< 0) {
326 room
= readq_be(&hwq
->host_map
->cmd_room
);
328 dev_dbg_ratelimited(dev
, "%s: no cmd_room to send "
329 "0x%02X, room=0x%016llX\n",
330 __func__
, cmd
->rcb
.cdb
[0], room
);
332 rc
= SCSI_MLQUEUE_HOST_BUSY
;
335 hwq
->room
= room
- 1;
338 list_add(&cmd
->list
, &hwq
->pending_cmds
);
339 writeq_be((u64
)&cmd
->rcb
, &hwq
->host_map
->ioarrin
);
341 spin_unlock_irqrestore(&hwq
->hsq_slock
, lock_flags
);
342 dev_dbg(dev
, "%s: cmd=%p len=%u ea=%016llx rc=%d\n", __func__
,
343 cmd
, cmd
->rcb
.data_len
, cmd
->rcb
.data_ea
, rc
);
348 * send_cmd_sq() - sends an AFU command via SQ ring
349 * @afu: AFU associated with the host.
350 * @cmd: AFU command to send.
353 * 0 on success, SCSI_MLQUEUE_HOST_BUSY on failure
355 static int send_cmd_sq(struct afu
*afu
, struct afu_cmd
*cmd
)
357 struct cxlflash_cfg
*cfg
= afu
->parent
;
358 struct device
*dev
= &cfg
->dev
->dev
;
359 struct hwq
*hwq
= get_hwq(afu
, cmd
->hwq_index
);
364 newval
= atomic_dec_if_positive(&hwq
->hsq_credits
);
366 rc
= SCSI_MLQUEUE_HOST_BUSY
;
370 cmd
->rcb
.ioasa
= &cmd
->sa
;
372 spin_lock_irqsave(&hwq
->hsq_slock
, lock_flags
);
374 *hwq
->hsq_curr
= cmd
->rcb
;
375 if (hwq
->hsq_curr
< hwq
->hsq_end
)
378 hwq
->hsq_curr
= hwq
->hsq_start
;
380 list_add(&cmd
->list
, &hwq
->pending_cmds
);
381 writeq_be((u64
)hwq
->hsq_curr
, &hwq
->host_map
->sq_tail
);
383 spin_unlock_irqrestore(&hwq
->hsq_slock
, lock_flags
);
385 dev_dbg(dev
, "%s: cmd=%p len=%u ea=%016llx ioasa=%p rc=%d curr=%p "
386 "head=%016llx tail=%016llx\n", __func__
, cmd
, cmd
->rcb
.data_len
,
387 cmd
->rcb
.data_ea
, cmd
->rcb
.ioasa
, rc
, hwq
->hsq_curr
,
388 readq_be(&hwq
->host_map
->sq_head
),
389 readq_be(&hwq
->host_map
->sq_tail
));
394 * wait_resp() - polls for a response or timeout to a sent AFU command
395 * @afu: AFU associated with the host.
396 * @cmd: AFU command that was sent.
398 * Return: 0 on success, -errno on failure
400 static int wait_resp(struct afu
*afu
, struct afu_cmd
*cmd
)
402 struct cxlflash_cfg
*cfg
= afu
->parent
;
403 struct device
*dev
= &cfg
->dev
->dev
;
405 ulong timeout
= msecs_to_jiffies(cmd
->rcb
.timeout
* 2 * 1000);
407 timeout
= wait_for_completion_timeout(&cmd
->cevent
, timeout
);
411 if (cmd
->cmd_aborted
)
414 if (unlikely(cmd
->sa
.ioasc
!= 0)) {
415 dev_err(dev
, "%s: cmd %02x failed, ioasc=%08x\n",
416 __func__
, cmd
->rcb
.cdb
[0], cmd
->sa
.ioasc
);
424 * cmd_to_target_hwq() - selects a target hardware queue for a SCSI command
425 * @host: SCSI host associated with device.
426 * @scp: SCSI command to send.
427 * @afu: SCSI command to send.
429 * Hashes a command based upon the hardware queue mode.
431 * Return: Trusted index of target hardware queue
433 static u32
cmd_to_target_hwq(struct Scsi_Host
*host
, struct scsi_cmnd
*scp
,
439 if (afu
->num_hwqs
== 1)
442 switch (afu
->hwq_mode
) {
444 hwq
= afu
->hwq_rr_count
++ % afu
->num_hwqs
;
447 tag
= blk_mq_unique_tag(scp
->request
);
448 hwq
= blk_mq_unique_tag_to_hwq(tag
);
451 hwq
= smp_processor_id() % afu
->num_hwqs
;
461 * send_tmf() - sends a Task Management Function (TMF)
462 * @cfg: Internal structure associated with the host.
463 * @sdev: SCSI device destined for TMF.
464 * @tmfcmd: TMF command to send.
467 * 0 on success, SCSI_MLQUEUE_HOST_BUSY or -errno on failure
469 static int send_tmf(struct cxlflash_cfg
*cfg
, struct scsi_device
*sdev
,
472 struct afu
*afu
= cfg
->afu
;
473 struct afu_cmd
*cmd
= NULL
;
474 struct device
*dev
= &cfg
->dev
->dev
;
475 struct hwq
*hwq
= get_hwq(afu
, PRIMARY_HWQ
);
481 buf
= kzalloc(sizeof(*cmd
) + __alignof__(*cmd
) - 1, GFP_KERNEL
);
482 if (unlikely(!buf
)) {
483 dev_err(dev
, "%s: no memory for command\n", __func__
);
488 cmd
= (struct afu_cmd
*)PTR_ALIGN(buf
, __alignof__(*cmd
));
489 INIT_LIST_HEAD(&cmd
->queue
);
491 /* When Task Management Function is active do not send another */
492 spin_lock_irqsave(&cfg
->tmf_slock
, lock_flags
);
494 wait_event_interruptible_lock_irq(cfg
->tmf_waitq
,
497 cfg
->tmf_active
= true;
498 spin_unlock_irqrestore(&cfg
->tmf_slock
, lock_flags
);
502 cmd
->hwq_index
= hwq
->index
;
504 cmd
->rcb
.ctx_id
= hwq
->ctx_hndl
;
505 cmd
->rcb
.msi
= SISL_MSI_RRQ_UPDATED
;
506 cmd
->rcb
.port_sel
= CHAN2PORTMASK(sdev
->channel
);
507 cmd
->rcb
.lun_id
= lun_to_lunid(sdev
->lun
);
508 cmd
->rcb
.req_flags
= (SISL_REQ_FLAGS_PORT_LUN_ID
|
509 SISL_REQ_FLAGS_SUP_UNDERRUN
|
510 SISL_REQ_FLAGS_TMF_CMD
);
511 memcpy(cmd
->rcb
.cdb
, &tmfcmd
, sizeof(tmfcmd
));
513 rc
= afu
->send_cmd(afu
, cmd
);
515 spin_lock_irqsave(&cfg
->tmf_slock
, lock_flags
);
516 cfg
->tmf_active
= false;
517 spin_unlock_irqrestore(&cfg
->tmf_slock
, lock_flags
);
521 spin_lock_irqsave(&cfg
->tmf_slock
, lock_flags
);
522 to
= msecs_to_jiffies(5000);
523 to
= wait_event_interruptible_lock_irq_timeout(cfg
->tmf_waitq
,
528 dev_err(dev
, "%s: TMF timed out\n", __func__
);
530 } else if (cmd
->cmd_aborted
) {
531 dev_err(dev
, "%s: TMF aborted\n", __func__
);
533 } else if (cmd
->sa
.ioasc
) {
534 dev_err(dev
, "%s: TMF failed ioasc=%08x\n",
535 __func__
, cmd
->sa
.ioasc
);
538 cfg
->tmf_active
= false;
539 spin_unlock_irqrestore(&cfg
->tmf_slock
, lock_flags
);
546 * cxlflash_driver_info() - information handler for this host driver
547 * @host: SCSI host associated with device.
549 * Return: A string describing the device.
551 static const char *cxlflash_driver_info(struct Scsi_Host
*host
)
553 return CXLFLASH_ADAPTER_NAME
;
557 * cxlflash_queuecommand() - sends a mid-layer request
558 * @host: SCSI host associated with device.
559 * @scp: SCSI command to send.
561 * Return: 0 on success, SCSI_MLQUEUE_HOST_BUSY on failure
563 static int cxlflash_queuecommand(struct Scsi_Host
*host
, struct scsi_cmnd
*scp
)
565 struct cxlflash_cfg
*cfg
= shost_priv(host
);
566 struct afu
*afu
= cfg
->afu
;
567 struct device
*dev
= &cfg
->dev
->dev
;
568 struct afu_cmd
*cmd
= sc_to_afuci(scp
);
569 struct scatterlist
*sg
= scsi_sglist(scp
);
570 int hwq_index
= cmd_to_target_hwq(host
, scp
, afu
);
571 struct hwq
*hwq
= get_hwq(afu
, hwq_index
);
572 u16 req_flags
= SISL_REQ_FLAGS_SUP_UNDERRUN
;
576 dev_dbg_ratelimited(dev
, "%s: (scp=%p) %d/%d/%d/%llu "
577 "cdb=(%08x-%08x-%08x-%08x)\n",
578 __func__
, scp
, host
->host_no
, scp
->device
->channel
,
579 scp
->device
->id
, scp
->device
->lun
,
580 get_unaligned_be32(&((u32
*)scp
->cmnd
)[0]),
581 get_unaligned_be32(&((u32
*)scp
->cmnd
)[1]),
582 get_unaligned_be32(&((u32
*)scp
->cmnd
)[2]),
583 get_unaligned_be32(&((u32
*)scp
->cmnd
)[3]));
586 * If a Task Management Function is active, wait for it to complete
587 * before continuing with regular commands.
589 spin_lock_irqsave(&cfg
->tmf_slock
, lock_flags
);
590 if (cfg
->tmf_active
) {
591 spin_unlock_irqrestore(&cfg
->tmf_slock
, lock_flags
);
592 rc
= SCSI_MLQUEUE_HOST_BUSY
;
595 spin_unlock_irqrestore(&cfg
->tmf_slock
, lock_flags
);
597 switch (cfg
->state
) {
601 dev_dbg_ratelimited(dev
, "%s: device is in reset\n", __func__
);
602 rc
= SCSI_MLQUEUE_HOST_BUSY
;
605 dev_dbg_ratelimited(dev
, "%s: device has failed\n", __func__
);
606 scp
->result
= (DID_NO_CONNECT
<< 16);
615 cmd
->rcb
.data_len
= sg
->length
;
616 cmd
->rcb
.data_ea
= (uintptr_t)sg_virt(sg
);
621 cmd
->hwq_index
= hwq_index
;
623 cmd
->rcb
.ctx_id
= hwq
->ctx_hndl
;
624 cmd
->rcb
.msi
= SISL_MSI_RRQ_UPDATED
;
625 cmd
->rcb
.port_sel
= CHAN2PORTMASK(scp
->device
->channel
);
626 cmd
->rcb
.lun_id
= lun_to_lunid(scp
->device
->lun
);
628 if (scp
->sc_data_direction
== DMA_TO_DEVICE
)
629 req_flags
|= SISL_REQ_FLAGS_HOST_WRITE
;
631 cmd
->rcb
.req_flags
= req_flags
;
632 memcpy(cmd
->rcb
.cdb
, scp
->cmnd
, sizeof(cmd
->rcb
.cdb
));
634 rc
= afu
->send_cmd(afu
, cmd
);
640 * cxlflash_wait_for_pci_err_recovery() - wait for error recovery during probe
641 * @cfg: Internal structure associated with the host.
643 static void cxlflash_wait_for_pci_err_recovery(struct cxlflash_cfg
*cfg
)
645 struct pci_dev
*pdev
= cfg
->dev
;
647 if (pci_channel_offline(pdev
))
648 wait_event_timeout(cfg
->reset_waitq
,
649 !pci_channel_offline(pdev
),
650 CXLFLASH_PCI_ERROR_RECOVERY_TIMEOUT
);
654 * free_mem() - free memory associated with the AFU
655 * @cfg: Internal structure associated with the host.
657 static void free_mem(struct cxlflash_cfg
*cfg
)
659 struct afu
*afu
= cfg
->afu
;
662 free_pages((ulong
)afu
, get_order(sizeof(struct afu
)));
668 * cxlflash_reset_sync() - synchronizing point for asynchronous resets
669 * @cfg: Internal structure associated with the host.
671 static void cxlflash_reset_sync(struct cxlflash_cfg
*cfg
)
673 if (cfg
->async_reset_cookie
== 0)
676 /* Wait until all async calls prior to this cookie have completed */
677 async_synchronize_cookie(cfg
->async_reset_cookie
+ 1);
678 cfg
->async_reset_cookie
= 0;
682 * stop_afu() - stops the AFU command timers and unmaps the MMIO space
683 * @cfg: Internal structure associated with the host.
685 * Safe to call with AFU in a partially allocated/initialized state.
687 * Cancels scheduled worker threads, waits for any active internal AFU
688 * commands to timeout, disables IRQ polling and then unmaps the MMIO space.
690 static void stop_afu(struct cxlflash_cfg
*cfg
)
692 struct afu
*afu
= cfg
->afu
;
696 cancel_work_sync(&cfg
->work_q
);
697 if (!current_is_async())
698 cxlflash_reset_sync(cfg
);
701 while (atomic_read(&afu
->cmds_active
))
704 if (afu_is_irqpoll_enabled(afu
)) {
705 for (i
= 0; i
< afu
->num_hwqs
; i
++) {
706 hwq
= get_hwq(afu
, i
);
708 irq_poll_disable(&hwq
->irqpoll
);
712 if (likely(afu
->afu_map
)) {
713 cxl_psa_unmap((void __iomem
*)afu
->afu_map
);
720 * term_intr() - disables all AFU interrupts
721 * @cfg: Internal structure associated with the host.
722 * @level: Depth of allocation, where to begin waterfall tear down.
723 * @index: Index of the hardware queue.
725 * Safe to call with AFU/MC in partially allocated/initialized state.
727 static void term_intr(struct cxlflash_cfg
*cfg
, enum undo_level level
,
730 struct afu
*afu
= cfg
->afu
;
731 struct device
*dev
= &cfg
->dev
->dev
;
735 dev_err(dev
, "%s: returning with NULL afu\n", __func__
);
739 hwq
= get_hwq(afu
, index
);
742 dev_err(dev
, "%s: returning with NULL MC\n", __func__
);
748 /* SISL_MSI_ASYNC_ERROR is setup only for the primary HWQ */
749 if (index
== PRIMARY_HWQ
)
750 cxl_unmap_afu_irq(hwq
->ctx
, 3, hwq
);
752 cxl_unmap_afu_irq(hwq
->ctx
, 2, hwq
);
754 cxl_unmap_afu_irq(hwq
->ctx
, 1, hwq
);
756 cxl_free_afu_irqs(hwq
->ctx
);
759 /* No action required */
765 * term_mc() - terminates the master context
766 * @cfg: Internal structure associated with the host.
767 * @index: Index of the hardware queue.
769 * Safe to call with AFU/MC in partially allocated/initialized state.
771 static void term_mc(struct cxlflash_cfg
*cfg
, u32 index
)
773 struct afu
*afu
= cfg
->afu
;
774 struct device
*dev
= &cfg
->dev
->dev
;
779 dev_err(dev
, "%s: returning with NULL afu\n", __func__
);
783 hwq
= get_hwq(afu
, index
);
786 dev_err(dev
, "%s: returning with NULL MC\n", __func__
);
790 WARN_ON(cxl_stop_context(hwq
->ctx
));
791 if (index
!= PRIMARY_HWQ
)
792 WARN_ON(cxl_release_context(hwq
->ctx
));
795 spin_lock_irqsave(&hwq
->hsq_slock
, lock_flags
);
796 flush_pending_cmds(hwq
);
797 spin_unlock_irqrestore(&hwq
->hsq_slock
, lock_flags
);
801 * term_afu() - terminates the AFU
802 * @cfg: Internal structure associated with the host.
804 * Safe to call with AFU/MC in partially allocated/initialized state.
806 static void term_afu(struct cxlflash_cfg
*cfg
)
808 struct device
*dev
= &cfg
->dev
->dev
;
812 * Tear down is carefully orchestrated to ensure
813 * no interrupts can come in when the problem state
816 * 1) Disable all AFU interrupts for each master
817 * 2) Unmap the problem state area
818 * 3) Stop each master context
820 for (k
= cfg
->afu
->num_hwqs
- 1; k
>= 0; k
--)
821 term_intr(cfg
, UNMAP_THREE
, k
);
826 for (k
= cfg
->afu
->num_hwqs
- 1; k
>= 0; k
--)
829 dev_dbg(dev
, "%s: returning\n", __func__
);
833 * notify_shutdown() - notifies device of pending shutdown
834 * @cfg: Internal structure associated with the host.
835 * @wait: Whether to wait for shutdown processing to complete.
837 * This function will notify the AFU that the adapter is being shutdown
838 * and will wait for shutdown processing to complete if wait is true.
839 * This notification should flush pending I/Os to the device and halt
840 * further I/Os until the next AFU reset is issued and device restarted.
842 static void notify_shutdown(struct cxlflash_cfg
*cfg
, bool wait
)
844 struct afu
*afu
= cfg
->afu
;
845 struct device
*dev
= &cfg
->dev
->dev
;
846 struct dev_dependent_vals
*ddv
;
847 __be64 __iomem
*fc_port_regs
;
849 int i
, retry_cnt
= 0;
851 ddv
= (struct dev_dependent_vals
*)cfg
->dev_id
->driver_data
;
852 if (!(ddv
->flags
& CXLFLASH_NOTIFY_SHUTDOWN
))
855 if (!afu
|| !afu
->afu_map
) {
856 dev_dbg(dev
, "%s: Problem state area not mapped\n", __func__
);
861 for (i
= 0; i
< cfg
->num_fc_ports
; i
++) {
862 fc_port_regs
= get_fc_port_regs(cfg
, i
);
864 reg
= readq_be(&fc_port_regs
[FC_CONFIG2
/ 8]);
865 reg
|= SISL_FC_SHUTDOWN_NORMAL
;
866 writeq_be(reg
, &fc_port_regs
[FC_CONFIG2
/ 8]);
872 /* Wait up to 1.5 seconds for shutdown processing to complete */
873 for (i
= 0; i
< cfg
->num_fc_ports
; i
++) {
874 fc_port_regs
= get_fc_port_regs(cfg
, i
);
878 status
= readq_be(&fc_port_regs
[FC_STATUS
/ 8]);
879 if (status
& SISL_STATUS_SHUTDOWN_COMPLETE
)
881 if (++retry_cnt
>= MC_RETRY_CNT
) {
882 dev_dbg(dev
, "%s: port %d shutdown processing "
883 "not yet completed\n", __func__
, i
);
886 msleep(100 * retry_cnt
);
892 * cxlflash_get_minor() - gets the first available minor number
894 * Return: Unique minor number that can be used to create the character device.
896 static int cxlflash_get_minor(void)
901 bit
= find_first_zero_bit(cxlflash_minor
, CXLFLASH_MAX_ADAPTERS
);
902 if (bit
>= CXLFLASH_MAX_ADAPTERS
)
905 minor
= bit
& MINORMASK
;
906 set_bit(minor
, cxlflash_minor
);
911 * cxlflash_put_minor() - releases the minor number
912 * @minor: Minor number that is no longer needed.
914 static void cxlflash_put_minor(int minor
)
916 clear_bit(minor
, cxlflash_minor
);
920 * cxlflash_release_chrdev() - release the character device for the host
921 * @cfg: Internal structure associated with the host.
923 static void cxlflash_release_chrdev(struct cxlflash_cfg
*cfg
)
925 device_unregister(cfg
->chardev
);
927 cdev_del(&cfg
->cdev
);
928 cxlflash_put_minor(MINOR(cfg
->cdev
.dev
));
932 * cxlflash_remove() - PCI entry point to tear down host
933 * @pdev: PCI device associated with the host.
935 * Safe to use as a cleanup in partially allocated/initialized state. Note that
936 * the reset_waitq is flushed as part of the stop/termination of user contexts.
938 static void cxlflash_remove(struct pci_dev
*pdev
)
940 struct cxlflash_cfg
*cfg
= pci_get_drvdata(pdev
);
941 struct device
*dev
= &pdev
->dev
;
944 if (!pci_is_enabled(pdev
)) {
945 dev_dbg(dev
, "%s: Device is disabled\n", __func__
);
949 /* If a Task Management Function is active, wait for it to complete
950 * before continuing with remove.
952 spin_lock_irqsave(&cfg
->tmf_slock
, lock_flags
);
954 wait_event_interruptible_lock_irq(cfg
->tmf_waitq
,
957 spin_unlock_irqrestore(&cfg
->tmf_slock
, lock_flags
);
959 /* Notify AFU and wait for shutdown processing to complete */
960 notify_shutdown(cfg
, true);
962 cfg
->state
= STATE_FAILTERM
;
963 cxlflash_stop_term_user_contexts(cfg
);
965 switch (cfg
->init_state
) {
966 case INIT_STATE_CDEV
:
967 cxlflash_release_chrdev(cfg
);
968 case INIT_STATE_SCSI
:
969 cxlflash_term_local_luns(cfg
);
970 scsi_remove_host(cfg
->host
);
974 pci_disable_device(pdev
);
975 case INIT_STATE_NONE
:
977 scsi_host_put(cfg
->host
);
981 dev_dbg(dev
, "%s: returning\n", __func__
);
985 * alloc_mem() - allocates the AFU and its command pool
986 * @cfg: Internal structure associated with the host.
988 * A partially allocated state remains on failure.
992 * -ENOMEM on failure to allocate memory
994 static int alloc_mem(struct cxlflash_cfg
*cfg
)
997 struct device
*dev
= &cfg
->dev
->dev
;
999 /* AFU is ~28k, i.e. only one 64k page or up to seven 4k pages */
1000 cfg
->afu
= (void *)__get_free_pages(GFP_KERNEL
| __GFP_ZERO
,
1001 get_order(sizeof(struct afu
)));
1002 if (unlikely(!cfg
->afu
)) {
1003 dev_err(dev
, "%s: cannot get %d free pages\n",
1004 __func__
, get_order(sizeof(struct afu
)));
1008 cfg
->afu
->parent
= cfg
;
1009 cfg
->afu
->desired_hwqs
= CXLFLASH_DEF_HWQS
;
1010 cfg
->afu
->afu_map
= NULL
;
1016 * init_pci() - initializes the host as a PCI device
1017 * @cfg: Internal structure associated with the host.
1019 * Return: 0 on success, -errno on failure
1021 static int init_pci(struct cxlflash_cfg
*cfg
)
1023 struct pci_dev
*pdev
= cfg
->dev
;
1024 struct device
*dev
= &cfg
->dev
->dev
;
1027 rc
= pci_enable_device(pdev
);
1028 if (rc
|| pci_channel_offline(pdev
)) {
1029 if (pci_channel_offline(pdev
)) {
1030 cxlflash_wait_for_pci_err_recovery(cfg
);
1031 rc
= pci_enable_device(pdev
);
1035 dev_err(dev
, "%s: Cannot enable adapter\n", __func__
);
1036 cxlflash_wait_for_pci_err_recovery(cfg
);
1042 dev_dbg(dev
, "%s: returning rc=%d\n", __func__
, rc
);
1047 * init_scsi() - adds the host to the SCSI stack and kicks off host scan
1048 * @cfg: Internal structure associated with the host.
1050 * Return: 0 on success, -errno on failure
1052 static int init_scsi(struct cxlflash_cfg
*cfg
)
1054 struct pci_dev
*pdev
= cfg
->dev
;
1055 struct device
*dev
= &cfg
->dev
->dev
;
1058 rc
= scsi_add_host(cfg
->host
, &pdev
->dev
);
1060 dev_err(dev
, "%s: scsi_add_host failed rc=%d\n", __func__
, rc
);
1064 scsi_scan_host(cfg
->host
);
1067 dev_dbg(dev
, "%s: returning rc=%d\n", __func__
, rc
);
1072 * set_port_online() - transitions the specified host FC port to online state
1073 * @fc_regs: Top of MMIO region defined for specified port.
1075 * The provided MMIO region must be mapped prior to call. Online state means
1076 * that the FC link layer has synced, completed the handshaking process, and
1077 * is ready for login to start.
1079 static void set_port_online(__be64 __iomem
*fc_regs
)
1083 cmdcfg
= readq_be(&fc_regs
[FC_MTIP_CMDCONFIG
/ 8]);
1084 cmdcfg
&= (~FC_MTIP_CMDCONFIG_OFFLINE
); /* clear OFF_LINE */
1085 cmdcfg
|= (FC_MTIP_CMDCONFIG_ONLINE
); /* set ON_LINE */
1086 writeq_be(cmdcfg
, &fc_regs
[FC_MTIP_CMDCONFIG
/ 8]);
1090 * set_port_offline() - transitions the specified host FC port to offline state
1091 * @fc_regs: Top of MMIO region defined for specified port.
1093 * The provided MMIO region must be mapped prior to call.
1095 static void set_port_offline(__be64 __iomem
*fc_regs
)
1099 cmdcfg
= readq_be(&fc_regs
[FC_MTIP_CMDCONFIG
/ 8]);
1100 cmdcfg
&= (~FC_MTIP_CMDCONFIG_ONLINE
); /* clear ON_LINE */
1101 cmdcfg
|= (FC_MTIP_CMDCONFIG_OFFLINE
); /* set OFF_LINE */
1102 writeq_be(cmdcfg
, &fc_regs
[FC_MTIP_CMDCONFIG
/ 8]);
1106 * wait_port_online() - waits for the specified host FC port come online
1107 * @fc_regs: Top of MMIO region defined for specified port.
1108 * @delay_us: Number of microseconds to delay between reading port status.
1109 * @nretry: Number of cycles to retry reading port status.
1111 * The provided MMIO region must be mapped prior to call. This will timeout
1112 * when the cable is not plugged in.
1115 * TRUE (1) when the specified port is online
1116 * FALSE (0) when the specified port fails to come online after timeout
1118 static bool wait_port_online(__be64 __iomem
*fc_regs
, u32 delay_us
, u32 nretry
)
1122 WARN_ON(delay_us
< 1000);
1125 msleep(delay_us
/ 1000);
1126 status
= readq_be(&fc_regs
[FC_MTIP_STATUS
/ 8]);
1127 if (status
== U64_MAX
)
1129 } while ((status
& FC_MTIP_STATUS_MASK
) != FC_MTIP_STATUS_ONLINE
&&
1132 return ((status
& FC_MTIP_STATUS_MASK
) == FC_MTIP_STATUS_ONLINE
);
1136 * wait_port_offline() - waits for the specified host FC port go offline
1137 * @fc_regs: Top of MMIO region defined for specified port.
1138 * @delay_us: Number of microseconds to delay between reading port status.
1139 * @nretry: Number of cycles to retry reading port status.
1141 * The provided MMIO region must be mapped prior to call.
1144 * TRUE (1) when the specified port is offline
1145 * FALSE (0) when the specified port fails to go offline after timeout
1147 static bool wait_port_offline(__be64 __iomem
*fc_regs
, u32 delay_us
, u32 nretry
)
1151 WARN_ON(delay_us
< 1000);
1154 msleep(delay_us
/ 1000);
1155 status
= readq_be(&fc_regs
[FC_MTIP_STATUS
/ 8]);
1156 if (status
== U64_MAX
)
1158 } while ((status
& FC_MTIP_STATUS_MASK
) != FC_MTIP_STATUS_OFFLINE
&&
1161 return ((status
& FC_MTIP_STATUS_MASK
) == FC_MTIP_STATUS_OFFLINE
);
1165 * afu_set_wwpn() - configures the WWPN for the specified host FC port
1166 * @afu: AFU associated with the host that owns the specified FC port.
1167 * @port: Port number being configured.
1168 * @fc_regs: Top of MMIO region defined for specified port.
1169 * @wwpn: The world-wide-port-number previously discovered for port.
1171 * The provided MMIO region must be mapped prior to call. As part of the
1172 * sequence to configure the WWPN, the port is toggled offline and then back
1173 * online. This toggling action can cause this routine to delay up to a few
1174 * seconds. When configured to use the internal LUN feature of the AFU, a
1175 * failure to come online is overridden.
1177 static void afu_set_wwpn(struct afu
*afu
, int port
, __be64 __iomem
*fc_regs
,
1180 struct cxlflash_cfg
*cfg
= afu
->parent
;
1181 struct device
*dev
= &cfg
->dev
->dev
;
1183 set_port_offline(fc_regs
);
1184 if (!wait_port_offline(fc_regs
, FC_PORT_STATUS_RETRY_INTERVAL_US
,
1185 FC_PORT_STATUS_RETRY_CNT
)) {
1186 dev_dbg(dev
, "%s: wait on port %d to go offline timed out\n",
1190 writeq_be(wwpn
, &fc_regs
[FC_PNAME
/ 8]);
1192 set_port_online(fc_regs
);
1193 if (!wait_port_online(fc_regs
, FC_PORT_STATUS_RETRY_INTERVAL_US
,
1194 FC_PORT_STATUS_RETRY_CNT
)) {
1195 dev_dbg(dev
, "%s: wait on port %d to go online timed out\n",
1201 * afu_link_reset() - resets the specified host FC port
1202 * @afu: AFU associated with the host that owns the specified FC port.
1203 * @port: Port number being configured.
1204 * @fc_regs: Top of MMIO region defined for specified port.
1206 * The provided MMIO region must be mapped prior to call. The sequence to
1207 * reset the port involves toggling it offline and then back online. This
1208 * action can cause this routine to delay up to a few seconds. An effort
1209 * is made to maintain link with the device by switching to host to use
1210 * the alternate port exclusively while the reset takes place.
1211 * failure to come online is overridden.
1213 static void afu_link_reset(struct afu
*afu
, int port
, __be64 __iomem
*fc_regs
)
1215 struct cxlflash_cfg
*cfg
= afu
->parent
;
1216 struct device
*dev
= &cfg
->dev
->dev
;
1219 /* first switch the AFU to the other links, if any */
1220 port_sel
= readq_be(&afu
->afu_map
->global
.regs
.afu_port_sel
);
1221 port_sel
&= ~(1ULL << port
);
1222 writeq_be(port_sel
, &afu
->afu_map
->global
.regs
.afu_port_sel
);
1223 cxlflash_afu_sync(afu
, 0, 0, AFU_GSYNC
);
1225 set_port_offline(fc_regs
);
1226 if (!wait_port_offline(fc_regs
, FC_PORT_STATUS_RETRY_INTERVAL_US
,
1227 FC_PORT_STATUS_RETRY_CNT
))
1228 dev_err(dev
, "%s: wait on port %d to go offline timed out\n",
1231 set_port_online(fc_regs
);
1232 if (!wait_port_online(fc_regs
, FC_PORT_STATUS_RETRY_INTERVAL_US
,
1233 FC_PORT_STATUS_RETRY_CNT
))
1234 dev_err(dev
, "%s: wait on port %d to go online timed out\n",
1237 /* switch back to include this port */
1238 port_sel
|= (1ULL << port
);
1239 writeq_be(port_sel
, &afu
->afu_map
->global
.regs
.afu_port_sel
);
1240 cxlflash_afu_sync(afu
, 0, 0, AFU_GSYNC
);
1242 dev_dbg(dev
, "%s: returning port_sel=%016llx\n", __func__
, port_sel
);
1246 * afu_err_intr_init() - clears and initializes the AFU for error interrupts
1247 * @afu: AFU associated with the host.
1249 static void afu_err_intr_init(struct afu
*afu
)
1251 struct cxlflash_cfg
*cfg
= afu
->parent
;
1252 __be64 __iomem
*fc_port_regs
;
1254 struct hwq
*hwq
= get_hwq(afu
, PRIMARY_HWQ
);
1257 /* global async interrupts: AFU clears afu_ctrl on context exit
1258 * if async interrupts were sent to that context. This prevents
1259 * the AFU form sending further async interrupts when
1261 * nobody to receive them.
1265 writeq_be(-1ULL, &afu
->afu_map
->global
.regs
.aintr_mask
);
1266 /* set LISN# to send and point to primary master context */
1267 reg
= ((u64
) (((hwq
->ctx_hndl
<< 8) | SISL_MSI_ASYNC_ERROR
)) << 40);
1269 if (afu
->internal_lun
)
1270 reg
|= 1; /* Bit 63 indicates local lun */
1271 writeq_be(reg
, &afu
->afu_map
->global
.regs
.afu_ctrl
);
1273 writeq_be(-1ULL, &afu
->afu_map
->global
.regs
.aintr_clear
);
1274 /* unmask bits that are of interest */
1275 /* note: afu can send an interrupt after this step */
1276 writeq_be(SISL_ASTATUS_MASK
, &afu
->afu_map
->global
.regs
.aintr_mask
);
1277 /* clear again in case a bit came on after previous clear but before */
1279 writeq_be(-1ULL, &afu
->afu_map
->global
.regs
.aintr_clear
);
1281 /* Clear/Set internal lun bits */
1282 fc_port_regs
= get_fc_port_regs(cfg
, 0);
1283 reg
= readq_be(&fc_port_regs
[FC_CONFIG2
/ 8]);
1284 reg
&= SISL_FC_INTERNAL_MASK
;
1285 if (afu
->internal_lun
)
1286 reg
|= ((u64
)(afu
->internal_lun
- 1) << SISL_FC_INTERNAL_SHIFT
);
1287 writeq_be(reg
, &fc_port_regs
[FC_CONFIG2
/ 8]);
1289 /* now clear FC errors */
1290 for (i
= 0; i
< cfg
->num_fc_ports
; i
++) {
1291 fc_port_regs
= get_fc_port_regs(cfg
, i
);
1293 writeq_be(0xFFFFFFFFU
, &fc_port_regs
[FC_ERROR
/ 8]);
1294 writeq_be(0, &fc_port_regs
[FC_ERRCAP
/ 8]);
1297 /* sync interrupts for master's IOARRIN write */
1298 /* note that unlike asyncs, there can be no pending sync interrupts */
1299 /* at this time (this is a fresh context and master has not written */
1300 /* IOARRIN yet), so there is nothing to clear. */
1302 /* set LISN#, it is always sent to the context that wrote IOARRIN */
1303 for (i
= 0; i
< afu
->num_hwqs
; i
++) {
1304 hwq
= get_hwq(afu
, i
);
1306 writeq_be(SISL_MSI_SYNC_ERROR
, &hwq
->host_map
->ctx_ctrl
);
1307 writeq_be(SISL_ISTATUS_MASK
, &hwq
->host_map
->intr_mask
);
1312 * cxlflash_sync_err_irq() - interrupt handler for synchronous errors
1313 * @irq: Interrupt number.
1314 * @data: Private data provided at interrupt registration, the AFU.
1316 * Return: Always return IRQ_HANDLED.
1318 static irqreturn_t
cxlflash_sync_err_irq(int irq
, void *data
)
1320 struct hwq
*hwq
= (struct hwq
*)data
;
1321 struct cxlflash_cfg
*cfg
= hwq
->afu
->parent
;
1322 struct device
*dev
= &cfg
->dev
->dev
;
1326 reg
= readq_be(&hwq
->host_map
->intr_status
);
1327 reg_unmasked
= (reg
& SISL_ISTATUS_UNMASK
);
1329 if (reg_unmasked
== 0UL) {
1330 dev_err(dev
, "%s: spurious interrupt, intr_status=%016llx\n",
1332 goto cxlflash_sync_err_irq_exit
;
1335 dev_err(dev
, "%s: unexpected interrupt, intr_status=%016llx\n",
1338 writeq_be(reg_unmasked
, &hwq
->host_map
->intr_clear
);
1340 cxlflash_sync_err_irq_exit
:
1345 * process_hrrq() - process the read-response queue
1346 * @afu: AFU associated with the host.
1347 * @doneq: Queue of commands harvested from the RRQ.
1348 * @budget: Threshold of RRQ entries to process.
1350 * This routine must be called holding the disabled RRQ spin lock.
1352 * Return: The number of entries processed.
1354 static int process_hrrq(struct hwq
*hwq
, struct list_head
*doneq
, int budget
)
1356 struct afu
*afu
= hwq
->afu
;
1357 struct afu_cmd
*cmd
;
1358 struct sisl_ioasa
*ioasa
;
1359 struct sisl_ioarcb
*ioarcb
;
1360 bool toggle
= hwq
->toggle
;
1363 *hrrq_start
= hwq
->hrrq_start
,
1364 *hrrq_end
= hwq
->hrrq_end
,
1365 *hrrq_curr
= hwq
->hrrq_curr
;
1367 /* Process ready RRQ entries up to the specified budget (if any) */
1371 if ((entry
& SISL_RESP_HANDLE_T_BIT
) != toggle
)
1374 entry
&= ~SISL_RESP_HANDLE_T_BIT
;
1376 if (afu_is_sq_cmd_mode(afu
)) {
1377 ioasa
= (struct sisl_ioasa
*)entry
;
1378 cmd
= container_of(ioasa
, struct afu_cmd
, sa
);
1380 ioarcb
= (struct sisl_ioarcb
*)entry
;
1381 cmd
= container_of(ioarcb
, struct afu_cmd
, rcb
);
1384 list_add_tail(&cmd
->queue
, doneq
);
1386 /* Advance to next entry or wrap and flip the toggle bit */
1387 if (hrrq_curr
< hrrq_end
)
1390 hrrq_curr
= hrrq_start
;
1391 toggle
^= SISL_RESP_HANDLE_T_BIT
;
1394 atomic_inc(&hwq
->hsq_credits
);
1397 if (budget
> 0 && num_hrrq
>= budget
)
1401 hwq
->hrrq_curr
= hrrq_curr
;
1402 hwq
->toggle
= toggle
;
1408 * process_cmd_doneq() - process a queue of harvested RRQ commands
1409 * @doneq: Queue of completed commands.
1411 * Note that upon return the queue can no longer be trusted.
1413 static void process_cmd_doneq(struct list_head
*doneq
)
1415 struct afu_cmd
*cmd
, *tmp
;
1417 WARN_ON(list_empty(doneq
));
1419 list_for_each_entry_safe(cmd
, tmp
, doneq
, queue
)
1424 * cxlflash_irqpoll() - process a queue of harvested RRQ commands
1425 * @irqpoll: IRQ poll structure associated with queue to poll.
1426 * @budget: Threshold of RRQ entries to process per poll.
1428 * Return: The number of entries processed.
1430 static int cxlflash_irqpoll(struct irq_poll
*irqpoll
, int budget
)
1432 struct hwq
*hwq
= container_of(irqpoll
, struct hwq
, irqpoll
);
1433 unsigned long hrrq_flags
;
1435 int num_entries
= 0;
1437 spin_lock_irqsave(&hwq
->hrrq_slock
, hrrq_flags
);
1439 num_entries
= process_hrrq(hwq
, &doneq
, budget
);
1440 if (num_entries
< budget
)
1441 irq_poll_complete(irqpoll
);
1443 spin_unlock_irqrestore(&hwq
->hrrq_slock
, hrrq_flags
);
1445 process_cmd_doneq(&doneq
);
1450 * cxlflash_rrq_irq() - interrupt handler for read-response queue (normal path)
1451 * @irq: Interrupt number.
1452 * @data: Private data provided at interrupt registration, the AFU.
1454 * Return: IRQ_HANDLED or IRQ_NONE when no ready entries found.
1456 static irqreturn_t
cxlflash_rrq_irq(int irq
, void *data
)
1458 struct hwq
*hwq
= (struct hwq
*)data
;
1459 struct afu
*afu
= hwq
->afu
;
1460 unsigned long hrrq_flags
;
1462 int num_entries
= 0;
1464 spin_lock_irqsave(&hwq
->hrrq_slock
, hrrq_flags
);
1466 if (afu_is_irqpoll_enabled(afu
)) {
1467 irq_poll_sched(&hwq
->irqpoll
);
1468 spin_unlock_irqrestore(&hwq
->hrrq_slock
, hrrq_flags
);
1472 num_entries
= process_hrrq(hwq
, &doneq
, -1);
1473 spin_unlock_irqrestore(&hwq
->hrrq_slock
, hrrq_flags
);
1475 if (num_entries
== 0)
1478 process_cmd_doneq(&doneq
);
1483 * Asynchronous interrupt information table
1486 * - Order matters here as this array is indexed by bit position.
1488 * - The checkpatch script considers the BUILD_SISL_ASTATUS_FC_PORT macro
1489 * as complex and complains due to a lack of parentheses/braces.
1491 #define ASTATUS_FC(_a, _b, _c, _d) \
1492 { SISL_ASTATUS_FC##_a##_##_b, _c, _a, (_d) }
1494 #define BUILD_SISL_ASTATUS_FC_PORT(_a) \
1495 ASTATUS_FC(_a, LINK_UP, "link up", 0), \
1496 ASTATUS_FC(_a, LINK_DN, "link down", 0), \
1497 ASTATUS_FC(_a, LOGI_S, "login succeeded", SCAN_HOST), \
1498 ASTATUS_FC(_a, LOGI_F, "login failed", CLR_FC_ERROR), \
1499 ASTATUS_FC(_a, LOGI_R, "login timed out, retrying", LINK_RESET), \
1500 ASTATUS_FC(_a, CRC_T, "CRC threshold exceeded", LINK_RESET), \
1501 ASTATUS_FC(_a, LOGO, "target initiated LOGO", 0), \
1502 ASTATUS_FC(_a, OTHER, "other error", CLR_FC_ERROR | LINK_RESET)
1504 static const struct asyc_intr_info ainfo
[] = {
1505 BUILD_SISL_ASTATUS_FC_PORT(1),
1506 BUILD_SISL_ASTATUS_FC_PORT(0),
1507 BUILD_SISL_ASTATUS_FC_PORT(3),
1508 BUILD_SISL_ASTATUS_FC_PORT(2)
1512 * cxlflash_async_err_irq() - interrupt handler for asynchronous errors
1513 * @irq: Interrupt number.
1514 * @data: Private data provided at interrupt registration, the AFU.
1516 * Return: Always return IRQ_HANDLED.
1518 static irqreturn_t
cxlflash_async_err_irq(int irq
, void *data
)
1520 struct hwq
*hwq
= (struct hwq
*)data
;
1521 struct afu
*afu
= hwq
->afu
;
1522 struct cxlflash_cfg
*cfg
= afu
->parent
;
1523 struct device
*dev
= &cfg
->dev
->dev
;
1524 const struct asyc_intr_info
*info
;
1525 struct sisl_global_map __iomem
*global
= &afu
->afu_map
->global
;
1526 __be64 __iomem
*fc_port_regs
;
1532 reg
= readq_be(&global
->regs
.aintr_status
);
1533 reg_unmasked
= (reg
& SISL_ASTATUS_UNMASK
);
1535 if (unlikely(reg_unmasked
== 0)) {
1536 dev_err(dev
, "%s: spurious interrupt, aintr_status=%016llx\n",
1541 /* FYI, it is 'okay' to clear AFU status before FC_ERROR */
1542 writeq_be(reg_unmasked
, &global
->regs
.aintr_clear
);
1544 /* Check each bit that is on */
1545 for_each_set_bit(bit
, (ulong
*)®_unmasked
, BITS_PER_LONG
) {
1546 if (unlikely(bit
>= ARRAY_SIZE(ainfo
))) {
1552 if (unlikely(info
->status
!= 1ULL << bit
)) {
1558 fc_port_regs
= get_fc_port_regs(cfg
, port
);
1560 dev_err(dev
, "%s: FC Port %d -> %s, fc_status=%016llx\n",
1561 __func__
, port
, info
->desc
,
1562 readq_be(&fc_port_regs
[FC_STATUS
/ 8]));
1565 * Do link reset first, some OTHER errors will set FC_ERROR
1566 * again if cleared before or w/o a reset
1568 if (info
->action
& LINK_RESET
) {
1569 dev_err(dev
, "%s: FC Port %d: resetting link\n",
1571 cfg
->lr_state
= LINK_RESET_REQUIRED
;
1572 cfg
->lr_port
= port
;
1573 schedule_work(&cfg
->work_q
);
1576 if (info
->action
& CLR_FC_ERROR
) {
1577 reg
= readq_be(&fc_port_regs
[FC_ERROR
/ 8]);
1580 * Since all errors are unmasked, FC_ERROR and FC_ERRCAP
1581 * should be the same and tracing one is sufficient.
1584 dev_err(dev
, "%s: fc %d: clearing fc_error=%016llx\n",
1585 __func__
, port
, reg
);
1587 writeq_be(reg
, &fc_port_regs
[FC_ERROR
/ 8]);
1588 writeq_be(0, &fc_port_regs
[FC_ERRCAP
/ 8]);
1591 if (info
->action
& SCAN_HOST
) {
1592 atomic_inc(&cfg
->scan_host_needed
);
1593 schedule_work(&cfg
->work_q
);
1602 * start_context() - starts the master context
1603 * @cfg: Internal structure associated with the host.
1604 * @index: Index of the hardware queue.
1606 * Return: A success or failure value from CXL services.
1608 static int start_context(struct cxlflash_cfg
*cfg
, u32 index
)
1610 struct device
*dev
= &cfg
->dev
->dev
;
1611 struct hwq
*hwq
= get_hwq(cfg
->afu
, index
);
1614 rc
= cxl_start_context(hwq
->ctx
,
1615 hwq
->work
.work_element_descriptor
,
1618 dev_dbg(dev
, "%s: returning rc=%d\n", __func__
, rc
);
1623 * read_vpd() - obtains the WWPNs from VPD
1624 * @cfg: Internal structure associated with the host.
1625 * @wwpn: Array of size MAX_FC_PORTS to pass back WWPNs
1627 * Return: 0 on success, -errno on failure
1629 static int read_vpd(struct cxlflash_cfg
*cfg
, u64 wwpn
[])
1631 struct device
*dev
= &cfg
->dev
->dev
;
1632 struct pci_dev
*pdev
= cfg
->dev
;
1634 int ro_start
, ro_size
, i
, j
, k
;
1636 char vpd_data
[CXLFLASH_VPD_LEN
];
1637 char tmp_buf
[WWPN_BUF_LEN
] = { 0 };
1638 char *wwpn_vpd_tags
[MAX_FC_PORTS
] = { "V5", "V6", "V7", "V8" };
1640 /* Get the VPD data from the device */
1641 vpd_size
= cxl_read_adapter_vpd(pdev
, vpd_data
, sizeof(vpd_data
));
1642 if (unlikely(vpd_size
<= 0)) {
1643 dev_err(dev
, "%s: Unable to read VPD (size = %ld)\n",
1644 __func__
, vpd_size
);
1649 /* Get the read only section offset */
1650 ro_start
= pci_vpd_find_tag(vpd_data
, 0, vpd_size
,
1651 PCI_VPD_LRDT_RO_DATA
);
1652 if (unlikely(ro_start
< 0)) {
1653 dev_err(dev
, "%s: VPD Read-only data not found\n", __func__
);
1658 /* Get the read only section size, cap when extends beyond read VPD */
1659 ro_size
= pci_vpd_lrdt_size(&vpd_data
[ro_start
]);
1661 i
= ro_start
+ PCI_VPD_LRDT_TAG_SIZE
;
1662 if (unlikely((i
+ j
) > vpd_size
)) {
1663 dev_dbg(dev
, "%s: Might need to read more VPD (%d > %ld)\n",
1664 __func__
, (i
+ j
), vpd_size
);
1665 ro_size
= vpd_size
- i
;
1669 * Find the offset of the WWPN tag within the read only
1670 * VPD data and validate the found field (partials are
1671 * no good to us). Convert the ASCII data to an integer
1672 * value. Note that we must copy to a temporary buffer
1673 * because the conversion service requires that the ASCII
1674 * string be terminated.
1676 for (k
= 0; k
< cfg
->num_fc_ports
; k
++) {
1678 i
= ro_start
+ PCI_VPD_LRDT_TAG_SIZE
;
1680 i
= pci_vpd_find_info_keyword(vpd_data
, i
, j
, wwpn_vpd_tags
[k
]);
1681 if (unlikely(i
< 0)) {
1682 dev_err(dev
, "%s: Port %d WWPN not found in VPD\n",
1688 j
= pci_vpd_info_field_size(&vpd_data
[i
]);
1689 i
+= PCI_VPD_INFO_FLD_HDR_SIZE
;
1690 if (unlikely((i
+ j
> vpd_size
) || (j
!= WWPN_LEN
))) {
1691 dev_err(dev
, "%s: Port %d WWPN incomplete or bad VPD\n",
1697 memcpy(tmp_buf
, &vpd_data
[i
], WWPN_LEN
);
1698 rc
= kstrtoul(tmp_buf
, WWPN_LEN
, (ulong
*)&wwpn
[k
]);
1700 dev_err(dev
, "%s: WWPN conversion failed for port %d\n",
1706 dev_dbg(dev
, "%s: wwpn%d=%016llx\n", __func__
, k
, wwpn
[k
]);
1710 dev_dbg(dev
, "%s: returning rc=%d\n", __func__
, rc
);
1715 * init_pcr() - initialize the provisioning and control registers
1716 * @cfg: Internal structure associated with the host.
1718 * Also sets up fast access to the mapped registers and initializes AFU
1719 * command fields that never change.
1721 static void init_pcr(struct cxlflash_cfg
*cfg
)
1723 struct afu
*afu
= cfg
->afu
;
1724 struct sisl_ctrl_map __iomem
*ctrl_map
;
1728 for (i
= 0; i
< MAX_CONTEXT
; i
++) {
1729 ctrl_map
= &afu
->afu_map
->ctrls
[i
].ctrl
;
1730 /* Disrupt any clients that could be running */
1731 /* e.g. clients that survived a master restart */
1732 writeq_be(0, &ctrl_map
->rht_start
);
1733 writeq_be(0, &ctrl_map
->rht_cnt_id
);
1734 writeq_be(0, &ctrl_map
->ctx_cap
);
1737 /* Copy frequently used fields into hwq */
1738 for (i
= 0; i
< afu
->num_hwqs
; i
++) {
1739 hwq
= get_hwq(afu
, i
);
1741 hwq
->ctx_hndl
= (u16
) cxl_process_element(hwq
->ctx
);
1742 hwq
->host_map
= &afu
->afu_map
->hosts
[hwq
->ctx_hndl
].host
;
1743 hwq
->ctrl_map
= &afu
->afu_map
->ctrls
[hwq
->ctx_hndl
].ctrl
;
1745 /* Program the Endian Control for the master context */
1746 writeq_be(SISL_ENDIAN_CTRL
, &hwq
->host_map
->endian_ctrl
);
1751 * init_global() - initialize AFU global registers
1752 * @cfg: Internal structure associated with the host.
1754 static int init_global(struct cxlflash_cfg
*cfg
)
1756 struct afu
*afu
= cfg
->afu
;
1757 struct device
*dev
= &cfg
->dev
->dev
;
1759 struct sisl_host_map __iomem
*hmap
;
1760 __be64 __iomem
*fc_port_regs
;
1761 u64 wwpn
[MAX_FC_PORTS
]; /* wwpn of AFU ports */
1762 int i
= 0, num_ports
= 0;
1766 rc
= read_vpd(cfg
, &wwpn
[0]);
1768 dev_err(dev
, "%s: could not read vpd rc=%d\n", __func__
, rc
);
1772 /* Set up RRQ and SQ in HWQ for master issued cmds */
1773 for (i
= 0; i
< afu
->num_hwqs
; i
++) {
1774 hwq
= get_hwq(afu
, i
);
1775 hmap
= hwq
->host_map
;
1777 writeq_be((u64
) hwq
->hrrq_start
, &hmap
->rrq_start
);
1778 writeq_be((u64
) hwq
->hrrq_end
, &hmap
->rrq_end
);
1780 if (afu_is_sq_cmd_mode(afu
)) {
1781 writeq_be((u64
)hwq
->hsq_start
, &hmap
->sq_start
);
1782 writeq_be((u64
)hwq
->hsq_end
, &hmap
->sq_end
);
1786 /* AFU configuration */
1787 reg
= readq_be(&afu
->afu_map
->global
.regs
.afu_config
);
1788 reg
|= SISL_AFUCONF_AR_ALL
|SISL_AFUCONF_ENDIAN
;
1789 /* enable all auto retry options and control endianness */
1790 /* leave others at default: */
1791 /* CTX_CAP write protected, mbox_r does not clear on read and */
1792 /* checker on if dual afu */
1793 writeq_be(reg
, &afu
->afu_map
->global
.regs
.afu_config
);
1795 /* Global port select: select either port */
1796 if (afu
->internal_lun
) {
1797 /* Only use port 0 */
1798 writeq_be(PORT0
, &afu
->afu_map
->global
.regs
.afu_port_sel
);
1801 writeq_be(PORT_MASK(cfg
->num_fc_ports
),
1802 &afu
->afu_map
->global
.regs
.afu_port_sel
);
1803 num_ports
= cfg
->num_fc_ports
;
1806 for (i
= 0; i
< num_ports
; i
++) {
1807 fc_port_regs
= get_fc_port_regs(cfg
, i
);
1809 /* Unmask all errors (but they are still masked at AFU) */
1810 writeq_be(0, &fc_port_regs
[FC_ERRMSK
/ 8]);
1811 /* Clear CRC error cnt & set a threshold */
1812 (void)readq_be(&fc_port_regs
[FC_CNT_CRCERR
/ 8]);
1813 writeq_be(MC_CRC_THRESH
, &fc_port_regs
[FC_CRC_THRESH
/ 8]);
1815 /* Set WWPNs. If already programmed, wwpn[i] is 0 */
1817 afu_set_wwpn(afu
, i
, &fc_port_regs
[0], wwpn
[i
]);
1818 /* Programming WWPN back to back causes additional
1819 * offline/online transitions and a PLOGI
1824 /* Set up master's own CTX_CAP to allow real mode, host translation */
1825 /* tables, afu cmds and read/write GSCSI cmds. */
1826 /* First, unlock ctx_cap write by reading mbox */
1827 for (i
= 0; i
< afu
->num_hwqs
; i
++) {
1828 hwq
= get_hwq(afu
, i
);
1830 (void)readq_be(&hwq
->ctrl_map
->mbox_r
); /* unlock ctx_cap */
1831 writeq_be((SISL_CTX_CAP_REAL_MODE
| SISL_CTX_CAP_HOST_XLATE
|
1832 SISL_CTX_CAP_READ_CMD
| SISL_CTX_CAP_WRITE_CMD
|
1833 SISL_CTX_CAP_AFU_CMD
| SISL_CTX_CAP_GSCSI_CMD
),
1834 &hwq
->ctrl_map
->ctx_cap
);
1838 * Determine write-same unmap support for host by evaluating the unmap
1839 * sector support bit of the context control register associated with
1840 * the primary hardware queue. Note that while this status is reflected
1841 * in a context register, the outcome can be assumed to be host-wide.
1843 hwq
= get_hwq(afu
, PRIMARY_HWQ
);
1844 reg
= readq_be(&hwq
->host_map
->ctx_ctrl
);
1845 if (reg
& SISL_CTX_CTRL_UNMAP_SECTOR
)
1846 cfg
->ws_unmap
= true;
1848 /* Initialize heartbeat */
1849 afu
->hb
= readq_be(&afu
->afu_map
->global
.regs
.afu_hb
);
1855 * start_afu() - initializes and starts the AFU
1856 * @cfg: Internal structure associated with the host.
1858 static int start_afu(struct cxlflash_cfg
*cfg
)
1860 struct afu
*afu
= cfg
->afu
;
1861 struct device
*dev
= &cfg
->dev
->dev
;
1868 /* Initialize each HWQ */
1869 for (i
= 0; i
< afu
->num_hwqs
; i
++) {
1870 hwq
= get_hwq(afu
, i
);
1872 /* After an AFU reset, RRQ entries are stale, clear them */
1873 memset(&hwq
->rrq_entry
, 0, sizeof(hwq
->rrq_entry
));
1875 /* Initialize RRQ pointers */
1876 hwq
->hrrq_start
= &hwq
->rrq_entry
[0];
1877 hwq
->hrrq_end
= &hwq
->rrq_entry
[NUM_RRQ_ENTRY
- 1];
1878 hwq
->hrrq_curr
= hwq
->hrrq_start
;
1881 /* Initialize spin locks */
1882 spin_lock_init(&hwq
->hrrq_slock
);
1883 spin_lock_init(&hwq
->hsq_slock
);
1886 if (afu_is_sq_cmd_mode(afu
)) {
1887 memset(&hwq
->sq
, 0, sizeof(hwq
->sq
));
1888 hwq
->hsq_start
= &hwq
->sq
[0];
1889 hwq
->hsq_end
= &hwq
->sq
[NUM_SQ_ENTRY
- 1];
1890 hwq
->hsq_curr
= hwq
->hsq_start
;
1892 atomic_set(&hwq
->hsq_credits
, NUM_SQ_ENTRY
- 1);
1895 /* Initialize IRQ poll */
1896 if (afu_is_irqpoll_enabled(afu
))
1897 irq_poll_init(&hwq
->irqpoll
, afu
->irqpoll_weight
,
1902 rc
= init_global(cfg
);
1904 dev_dbg(dev
, "%s: returning rc=%d\n", __func__
, rc
);
1909 * init_intr() - setup interrupt handlers for the master context
1910 * @cfg: Internal structure associated with the host.
1911 * @hwq: Hardware queue to initialize.
1913 * Return: 0 on success, -errno on failure
1915 static enum undo_level
init_intr(struct cxlflash_cfg
*cfg
,
1918 struct device
*dev
= &cfg
->dev
->dev
;
1919 struct cxl_context
*ctx
= hwq
->ctx
;
1921 enum undo_level level
= UNDO_NOOP
;
1922 bool is_primary_hwq
= (hwq
->index
== PRIMARY_HWQ
);
1923 int num_irqs
= is_primary_hwq
? 3 : 2;
1925 rc
= cxl_allocate_afu_irqs(ctx
, num_irqs
);
1927 dev_err(dev
, "%s: allocate_afu_irqs failed rc=%d\n",
1933 rc
= cxl_map_afu_irq(ctx
, 1, cxlflash_sync_err_irq
, hwq
,
1934 "SISL_MSI_SYNC_ERROR");
1935 if (unlikely(rc
<= 0)) {
1936 dev_err(dev
, "%s: SISL_MSI_SYNC_ERROR map failed\n", __func__
);
1941 rc
= cxl_map_afu_irq(ctx
, 2, cxlflash_rrq_irq
, hwq
,
1942 "SISL_MSI_RRQ_UPDATED");
1943 if (unlikely(rc
<= 0)) {
1944 dev_err(dev
, "%s: SISL_MSI_RRQ_UPDATED map failed\n", __func__
);
1949 /* SISL_MSI_ASYNC_ERROR is setup only for the primary HWQ */
1950 if (!is_primary_hwq
)
1953 rc
= cxl_map_afu_irq(ctx
, 3, cxlflash_async_err_irq
, hwq
,
1954 "SISL_MSI_ASYNC_ERROR");
1955 if (unlikely(rc
<= 0)) {
1956 dev_err(dev
, "%s: SISL_MSI_ASYNC_ERROR map failed\n", __func__
);
1965 * init_mc() - create and register as the master context
1966 * @cfg: Internal structure associated with the host.
1967 * index: HWQ Index of the master context.
1969 * Return: 0 on success, -errno on failure
1971 static int init_mc(struct cxlflash_cfg
*cfg
, u32 index
)
1973 struct cxl_context
*ctx
;
1974 struct device
*dev
= &cfg
->dev
->dev
;
1975 struct hwq
*hwq
= get_hwq(cfg
->afu
, index
);
1977 enum undo_level level
;
1979 hwq
->afu
= cfg
->afu
;
1981 INIT_LIST_HEAD(&hwq
->pending_cmds
);
1983 if (index
== PRIMARY_HWQ
)
1984 ctx
= cxl_get_context(cfg
->dev
);
1986 ctx
= cxl_dev_context_init(cfg
->dev
);
1987 if (unlikely(!ctx
)) {
1995 /* Set it up as a master with the CXL */
1996 cxl_set_master(ctx
);
1998 /* Reset AFU when initializing primary context */
1999 if (index
== PRIMARY_HWQ
) {
2000 rc
= cxl_afu_reset(ctx
);
2002 dev_err(dev
, "%s: AFU reset failed rc=%d\n",
2008 level
= init_intr(cfg
, hwq
);
2009 if (unlikely(level
)) {
2010 dev_err(dev
, "%s: interrupt init failed rc=%d\n", __func__
, rc
);
2014 /* This performs the equivalent of the CXL_IOCTL_START_WORK.
2015 * The CXL_IOCTL_GET_PROCESS_ELEMENT is implicit in the process
2016 * element (pe) that is embedded in the context (ctx)
2018 rc
= start_context(cfg
, index
);
2020 dev_err(dev
, "%s: start context failed rc=%d\n", __func__
, rc
);
2021 level
= UNMAP_THREE
;
2026 dev_dbg(dev
, "%s: returning rc=%d\n", __func__
, rc
);
2029 term_intr(cfg
, level
, index
);
2030 if (index
!= PRIMARY_HWQ
)
2031 cxl_release_context(ctx
);
2038 * get_num_afu_ports() - determines and configures the number of AFU ports
2039 * @cfg: Internal structure associated with the host.
2041 * This routine determines the number of AFU ports by converting the global
2042 * port selection mask. The converted value is only valid following an AFU
2043 * reset (explicit or power-on). This routine must be invoked shortly after
2044 * mapping as other routines are dependent on the number of ports during the
2045 * initialization sequence.
2047 * To support legacy AFUs that might not have reflected an initial global
2048 * port mask (value read is 0), default to the number of ports originally
2049 * supported by the cxlflash driver (2) before hardware with other port
2050 * offerings was introduced.
2052 static void get_num_afu_ports(struct cxlflash_cfg
*cfg
)
2054 struct afu
*afu
= cfg
->afu
;
2055 struct device
*dev
= &cfg
->dev
->dev
;
2057 int num_fc_ports
= LEGACY_FC_PORTS
;
2059 port_mask
= readq_be(&afu
->afu_map
->global
.regs
.afu_port_sel
);
2060 if (port_mask
!= 0ULL)
2061 num_fc_ports
= min(ilog2(port_mask
) + 1, MAX_FC_PORTS
);
2063 dev_dbg(dev
, "%s: port_mask=%016llx num_fc_ports=%d\n",
2064 __func__
, port_mask
, num_fc_ports
);
2066 cfg
->num_fc_ports
= num_fc_ports
;
2067 cfg
->host
->max_channel
= PORTNUM2CHAN(num_fc_ports
);
2071 * init_afu() - setup as master context and start AFU
2072 * @cfg: Internal structure associated with the host.
2074 * This routine is a higher level of control for configuring the
2075 * AFU on probe and reset paths.
2077 * Return: 0 on success, -errno on failure
2079 static int init_afu(struct cxlflash_cfg
*cfg
)
2083 struct afu
*afu
= cfg
->afu
;
2084 struct device
*dev
= &cfg
->dev
->dev
;
2088 cxl_perst_reloads_same_image(cfg
->cxl_afu
, true);
2090 afu
->num_hwqs
= afu
->desired_hwqs
;
2091 for (i
= 0; i
< afu
->num_hwqs
; i
++) {
2092 rc
= init_mc(cfg
, i
);
2094 dev_err(dev
, "%s: init_mc failed rc=%d index=%d\n",
2100 /* Map the entire MMIO space of the AFU using the first context */
2101 hwq
= get_hwq(afu
, PRIMARY_HWQ
);
2102 afu
->afu_map
= cxl_psa_map(hwq
->ctx
);
2103 if (!afu
->afu_map
) {
2104 dev_err(dev
, "%s: cxl_psa_map failed\n", __func__
);
2109 /* No byte reverse on reading afu_version or string will be backwards */
2110 reg
= readq(&afu
->afu_map
->global
.regs
.afu_version
);
2111 memcpy(afu
->version
, ®
, sizeof(reg
));
2112 afu
->interface_version
=
2113 readq_be(&afu
->afu_map
->global
.regs
.interface_version
);
2114 if ((afu
->interface_version
+ 1) == 0) {
2115 dev_err(dev
, "Back level AFU, please upgrade. AFU version %s "
2116 "interface version %016llx\n", afu
->version
,
2117 afu
->interface_version
);
2122 if (afu_is_sq_cmd_mode(afu
)) {
2123 afu
->send_cmd
= send_cmd_sq
;
2124 afu
->context_reset
= context_reset_sq
;
2126 afu
->send_cmd
= send_cmd_ioarrin
;
2127 afu
->context_reset
= context_reset_ioarrin
;
2130 dev_dbg(dev
, "%s: afu_ver=%s interface_ver=%016llx\n", __func__
,
2131 afu
->version
, afu
->interface_version
);
2133 get_num_afu_ports(cfg
);
2135 rc
= start_afu(cfg
);
2137 dev_err(dev
, "%s: start_afu failed, rc=%d\n", __func__
, rc
);
2141 afu_err_intr_init(cfg
->afu
);
2142 for (i
= 0; i
< afu
->num_hwqs
; i
++) {
2143 hwq
= get_hwq(afu
, i
);
2145 hwq
->room
= readq_be(&hwq
->host_map
->cmd_room
);
2148 /* Restore the LUN mappings */
2149 cxlflash_restore_luntable(cfg
);
2151 dev_dbg(dev
, "%s: returning rc=%d\n", __func__
, rc
);
2155 for (i
= afu
->num_hwqs
- 1; i
>= 0; i
--) {
2156 term_intr(cfg
, UNMAP_THREE
, i
);
2163 * afu_reset() - resets the AFU
2164 * @cfg: Internal structure associated with the host.
2166 * Return: 0 on success, -errno on failure
2168 static int afu_reset(struct cxlflash_cfg
*cfg
)
2170 struct device
*dev
= &cfg
->dev
->dev
;
2173 /* Stop the context before the reset. Since the context is
2174 * no longer available restart it after the reset is complete
2180 dev_dbg(dev
, "%s: returning rc=%d\n", __func__
, rc
);
2185 * drain_ioctls() - wait until all currently executing ioctls have completed
2186 * @cfg: Internal structure associated with the host.
2188 * Obtain write access to read/write semaphore that wraps ioctl
2189 * handling to 'drain' ioctls currently executing.
2191 static void drain_ioctls(struct cxlflash_cfg
*cfg
)
2193 down_write(&cfg
->ioctl_rwsem
);
2194 up_write(&cfg
->ioctl_rwsem
);
2198 * cxlflash_async_reset_host() - asynchronous host reset handler
2199 * @data: Private data provided while scheduling reset.
2200 * @cookie: Cookie that can be used for checkpointing.
2202 static void cxlflash_async_reset_host(void *data
, async_cookie_t cookie
)
2204 struct cxlflash_cfg
*cfg
= data
;
2205 struct device
*dev
= &cfg
->dev
->dev
;
2208 if (cfg
->state
!= STATE_RESET
) {
2209 dev_dbg(dev
, "%s: Not performing a reset, state=%d\n",
2210 __func__
, cfg
->state
);
2215 cxlflash_mark_contexts_error(cfg
);
2216 rc
= afu_reset(cfg
);
2218 cfg
->state
= STATE_FAILTERM
;
2220 cfg
->state
= STATE_NORMAL
;
2221 wake_up_all(&cfg
->reset_waitq
);
2224 scsi_unblock_requests(cfg
->host
);
2228 * cxlflash_schedule_async_reset() - schedule an asynchronous host reset
2229 * @cfg: Internal structure associated with the host.
2231 static void cxlflash_schedule_async_reset(struct cxlflash_cfg
*cfg
)
2233 struct device
*dev
= &cfg
->dev
->dev
;
2235 if (cfg
->state
!= STATE_NORMAL
) {
2236 dev_dbg(dev
, "%s: Not performing reset state=%d\n",
2237 __func__
, cfg
->state
);
2241 cfg
->state
= STATE_RESET
;
2242 scsi_block_requests(cfg
->host
);
2243 cfg
->async_reset_cookie
= async_schedule(cxlflash_async_reset_host
,
2248 * send_afu_cmd() - builds and sends an internal AFU command
2249 * @afu: AFU associated with the host.
2250 * @rcb: Pre-populated IOARCB describing command to send.
2252 * The AFU can only take one internal AFU command at a time. This limitation is
2253 * enforced by using a mutex to provide exclusive access to the AFU during the
2254 * operation. This design point requires calling threads to not be on interrupt
2255 * context due to the possibility of sleeping during concurrent AFU operations.
2257 * The command status is optionally passed back to the caller when the caller
2258 * populates the IOASA field of the IOARCB with a pointer to an IOASA structure.
2261 * 0 on success, -errno on failure
2263 static int send_afu_cmd(struct afu
*afu
, struct sisl_ioarcb
*rcb
)
2265 struct cxlflash_cfg
*cfg
= afu
->parent
;
2266 struct device
*dev
= &cfg
->dev
->dev
;
2267 struct afu_cmd
*cmd
= NULL
;
2268 struct hwq
*hwq
= get_hwq(afu
, PRIMARY_HWQ
);
2272 static DEFINE_MUTEX(sync_active
);
2274 if (cfg
->state
!= STATE_NORMAL
) {
2275 dev_dbg(dev
, "%s: Sync not required state=%u\n",
2276 __func__
, cfg
->state
);
2280 mutex_lock(&sync_active
);
2281 atomic_inc(&afu
->cmds_active
);
2282 buf
= kmalloc(sizeof(*cmd
) + __alignof__(*cmd
) - 1, GFP_KERNEL
);
2283 if (unlikely(!buf
)) {
2284 dev_err(dev
, "%s: no memory for command\n", __func__
);
2289 cmd
= (struct afu_cmd
*)PTR_ALIGN(buf
, __alignof__(*cmd
));
2292 memset(cmd
, 0, sizeof(*cmd
));
2293 memcpy(&cmd
->rcb
, rcb
, sizeof(*rcb
));
2294 INIT_LIST_HEAD(&cmd
->queue
);
2295 init_completion(&cmd
->cevent
);
2297 cmd
->hwq_index
= hwq
->index
;
2298 cmd
->rcb
.ctx_id
= hwq
->ctx_hndl
;
2300 dev_dbg(dev
, "%s: afu=%p cmd=%p type=%02x nretry=%d\n",
2301 __func__
, afu
, cmd
, cmd
->rcb
.cdb
[0], nretry
);
2303 rc
= afu
->send_cmd(afu
, cmd
);
2309 rc
= wait_resp(afu
, cmd
);
2312 rc
= afu
->context_reset(hwq
);
2314 cxlflash_schedule_async_reset(cfg
);
2317 /* fall through to retry */
2321 /* fall through to exit */
2327 *rcb
->ioasa
= cmd
->sa
;
2329 atomic_dec(&afu
->cmds_active
);
2330 mutex_unlock(&sync_active
);
2332 dev_dbg(dev
, "%s: returning rc=%d\n", __func__
, rc
);
2337 * cxlflash_afu_sync() - builds and sends an AFU sync command
2338 * @afu: AFU associated with the host.
2339 * @ctx: Identifies context requesting sync.
2340 * @res: Identifies resource requesting sync.
2341 * @mode: Type of sync to issue (lightweight, heavyweight, global).
2343 * AFU sync operations are only necessary and allowed when the device is
2344 * operating normally. When not operating normally, sync requests can occur as
2345 * part of cleaning up resources associated with an adapter prior to removal.
2346 * In this scenario, these requests are simply ignored (safe due to the AFU
2350 * 0 on success, -errno on failure
2352 int cxlflash_afu_sync(struct afu
*afu
, ctx_hndl_t ctx
, res_hndl_t res
, u8 mode
)
2354 struct cxlflash_cfg
*cfg
= afu
->parent
;
2355 struct device
*dev
= &cfg
->dev
->dev
;
2356 struct sisl_ioarcb rcb
= { 0 };
2358 dev_dbg(dev
, "%s: afu=%p ctx=%u res=%u mode=%u\n",
2359 __func__
, afu
, ctx
, res
, mode
);
2361 rcb
.req_flags
= SISL_REQ_FLAGS_AFU_CMD
;
2362 rcb
.msi
= SISL_MSI_RRQ_UPDATED
;
2363 rcb
.timeout
= MC_AFU_SYNC_TIMEOUT
;
2365 rcb
.cdb
[0] = SISL_AFU_CMD_SYNC
;
2367 put_unaligned_be16(ctx
, &rcb
.cdb
[2]);
2368 put_unaligned_be32(res
, &rcb
.cdb
[4]);
2370 return send_afu_cmd(afu
, &rcb
);
2374 * cxlflash_eh_abort_handler() - abort a SCSI command
2375 * @scp: SCSI command to abort.
2377 * CXL Flash devices do not support a single command abort. Reset the context
2378 * as per SISLite specification. Flush any pending commands in the hardware
2379 * queue before the reset.
2381 * Return: SUCCESS/FAILED as defined in scsi/scsi.h
2383 static int cxlflash_eh_abort_handler(struct scsi_cmnd
*scp
)
2386 struct Scsi_Host
*host
= scp
->device
->host
;
2387 struct cxlflash_cfg
*cfg
= shost_priv(host
);
2388 struct afu_cmd
*cmd
= sc_to_afuc(scp
);
2389 struct device
*dev
= &cfg
->dev
->dev
;
2390 struct afu
*afu
= cfg
->afu
;
2391 struct hwq
*hwq
= get_hwq(afu
, cmd
->hwq_index
);
2393 dev_dbg(dev
, "%s: (scp=%p) %d/%d/%d/%llu "
2394 "cdb=(%08x-%08x-%08x-%08x)\n", __func__
, scp
, host
->host_no
,
2395 scp
->device
->channel
, scp
->device
->id
, scp
->device
->lun
,
2396 get_unaligned_be32(&((u32
*)scp
->cmnd
)[0]),
2397 get_unaligned_be32(&((u32
*)scp
->cmnd
)[1]),
2398 get_unaligned_be32(&((u32
*)scp
->cmnd
)[2]),
2399 get_unaligned_be32(&((u32
*)scp
->cmnd
)[3]));
2401 /* When the state is not normal, another reset/reload is in progress.
2402 * Return failed and the mid-layer will invoke host reset handler.
2404 if (cfg
->state
!= STATE_NORMAL
) {
2405 dev_dbg(dev
, "%s: Invalid state for abort, state=%d\n",
2406 __func__
, cfg
->state
);
2410 rc
= afu
->context_reset(hwq
);
2417 dev_dbg(dev
, "%s: returning rc=%d\n", __func__
, rc
);
2422 * cxlflash_eh_device_reset_handler() - reset a single LUN
2423 * @scp: SCSI command to send.
2426 * SUCCESS as defined in scsi/scsi.h
2427 * FAILED as defined in scsi/scsi.h
2429 static int cxlflash_eh_device_reset_handler(struct scsi_cmnd
*scp
)
2432 struct scsi_device
*sdev
= scp
->device
;
2433 struct Scsi_Host
*host
= sdev
->host
;
2434 struct cxlflash_cfg
*cfg
= shost_priv(host
);
2435 struct device
*dev
= &cfg
->dev
->dev
;
2438 dev_dbg(dev
, "%s: %d/%d/%d/%llu\n", __func__
,
2439 host
->host_no
, sdev
->channel
, sdev
->id
, sdev
->lun
);
2441 switch (cfg
->state
) {
2443 rcr
= send_tmf(cfg
, sdev
, TMF_LUN_RESET
);
2448 wait_event(cfg
->reset_waitq
, cfg
->state
!= STATE_RESET
);
2455 dev_dbg(dev
, "%s: returning rc=%d\n", __func__
, rc
);
2460 * cxlflash_eh_host_reset_handler() - reset the host adapter
2461 * @scp: SCSI command from stack identifying host.
2463 * Following a reset, the state is evaluated again in case an EEH occurred
2464 * during the reset. In such a scenario, the host reset will either yield
2465 * until the EEH recovery is complete or return success or failure based
2466 * upon the current device state.
2469 * SUCCESS as defined in scsi/scsi.h
2470 * FAILED as defined in scsi/scsi.h
2472 static int cxlflash_eh_host_reset_handler(struct scsi_cmnd
*scp
)
2476 struct Scsi_Host
*host
= scp
->device
->host
;
2477 struct cxlflash_cfg
*cfg
= shost_priv(host
);
2478 struct device
*dev
= &cfg
->dev
->dev
;
2480 dev_dbg(dev
, "%s: %d\n", __func__
, host
->host_no
);
2482 switch (cfg
->state
) {
2484 cfg
->state
= STATE_RESET
;
2486 cxlflash_mark_contexts_error(cfg
);
2487 rcr
= afu_reset(cfg
);
2490 cfg
->state
= STATE_FAILTERM
;
2492 cfg
->state
= STATE_NORMAL
;
2493 wake_up_all(&cfg
->reset_waitq
);
2497 wait_event(cfg
->reset_waitq
, cfg
->state
!= STATE_RESET
);
2498 if (cfg
->state
== STATE_NORMAL
)
2506 dev_dbg(dev
, "%s: returning rc=%d\n", __func__
, rc
);
2511 * cxlflash_change_queue_depth() - change the queue depth for the device
2512 * @sdev: SCSI device destined for queue depth change.
2513 * @qdepth: Requested queue depth value to set.
2515 * The requested queue depth is capped to the maximum supported value.
2517 * Return: The actual queue depth set.
2519 static int cxlflash_change_queue_depth(struct scsi_device
*sdev
, int qdepth
)
2522 if (qdepth
> CXLFLASH_MAX_CMDS_PER_LUN
)
2523 qdepth
= CXLFLASH_MAX_CMDS_PER_LUN
;
2525 scsi_change_queue_depth(sdev
, qdepth
);
2526 return sdev
->queue_depth
;
2530 * cxlflash_show_port_status() - queries and presents the current port status
2531 * @port: Desired port for status reporting.
2532 * @cfg: Internal structure associated with the host.
2533 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
2535 * Return: The size of the ASCII string returned in @buf or -EINVAL.
2537 static ssize_t
cxlflash_show_port_status(u32 port
,
2538 struct cxlflash_cfg
*cfg
,
2541 struct device
*dev
= &cfg
->dev
->dev
;
2544 __be64 __iomem
*fc_port_regs
;
2546 WARN_ON(port
>= MAX_FC_PORTS
);
2548 if (port
>= cfg
->num_fc_ports
) {
2549 dev_info(dev
, "%s: Port %d not supported on this card.\n",
2554 fc_port_regs
= get_fc_port_regs(cfg
, port
);
2555 status
= readq_be(&fc_port_regs
[FC_MTIP_STATUS
/ 8]);
2556 status
&= FC_MTIP_STATUS_MASK
;
2558 if (status
== FC_MTIP_STATUS_ONLINE
)
2559 disp_status
= "online";
2560 else if (status
== FC_MTIP_STATUS_OFFLINE
)
2561 disp_status
= "offline";
2563 disp_status
= "unknown";
2565 return scnprintf(buf
, PAGE_SIZE
, "%s\n", disp_status
);
2569 * port0_show() - queries and presents the current status of port 0
2570 * @dev: Generic device associated with the host owning the port.
2571 * @attr: Device attribute representing the port.
2572 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
2574 * Return: The size of the ASCII string returned in @buf.
2576 static ssize_t
port0_show(struct device
*dev
,
2577 struct device_attribute
*attr
,
2580 struct cxlflash_cfg
*cfg
= shost_priv(class_to_shost(dev
));
2582 return cxlflash_show_port_status(0, cfg
, buf
);
2586 * port1_show() - queries and presents the current status of port 1
2587 * @dev: Generic device associated with the host owning the port.
2588 * @attr: Device attribute representing the port.
2589 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
2591 * Return: The size of the ASCII string returned in @buf.
2593 static ssize_t
port1_show(struct device
*dev
,
2594 struct device_attribute
*attr
,
2597 struct cxlflash_cfg
*cfg
= shost_priv(class_to_shost(dev
));
2599 return cxlflash_show_port_status(1, cfg
, buf
);
2603 * port2_show() - queries and presents the current status of port 2
2604 * @dev: Generic device associated with the host owning the port.
2605 * @attr: Device attribute representing the port.
2606 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
2608 * Return: The size of the ASCII string returned in @buf.
2610 static ssize_t
port2_show(struct device
*dev
,
2611 struct device_attribute
*attr
,
2614 struct cxlflash_cfg
*cfg
= shost_priv(class_to_shost(dev
));
2616 return cxlflash_show_port_status(2, cfg
, buf
);
2620 * port3_show() - queries and presents the current status of port 3
2621 * @dev: Generic device associated with the host owning the port.
2622 * @attr: Device attribute representing the port.
2623 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
2625 * Return: The size of the ASCII string returned in @buf.
2627 static ssize_t
port3_show(struct device
*dev
,
2628 struct device_attribute
*attr
,
2631 struct cxlflash_cfg
*cfg
= shost_priv(class_to_shost(dev
));
2633 return cxlflash_show_port_status(3, cfg
, buf
);
2637 * lun_mode_show() - presents the current LUN mode of the host
2638 * @dev: Generic device associated with the host.
2639 * @attr: Device attribute representing the LUN mode.
2640 * @buf: Buffer of length PAGE_SIZE to report back the LUN mode in ASCII.
2642 * Return: The size of the ASCII string returned in @buf.
2644 static ssize_t
lun_mode_show(struct device
*dev
,
2645 struct device_attribute
*attr
, char *buf
)
2647 struct cxlflash_cfg
*cfg
= shost_priv(class_to_shost(dev
));
2648 struct afu
*afu
= cfg
->afu
;
2650 return scnprintf(buf
, PAGE_SIZE
, "%u\n", afu
->internal_lun
);
2654 * lun_mode_store() - sets the LUN mode of the host
2655 * @dev: Generic device associated with the host.
2656 * @attr: Device attribute representing the LUN mode.
2657 * @buf: Buffer of length PAGE_SIZE containing the LUN mode in ASCII.
2658 * @count: Length of data resizing in @buf.
2660 * The CXL Flash AFU supports a dummy LUN mode where the external
2661 * links and storage are not required. Space on the FPGA is used
2662 * to create 1 or 2 small LUNs which are presented to the system
2663 * as if they were a normal storage device. This feature is useful
2664 * during development and also provides manufacturing with a way
2665 * to test the AFU without an actual device.
2667 * 0 = external LUN[s] (default)
2668 * 1 = internal LUN (1 x 64K, 512B blocks, id 0)
2669 * 2 = internal LUN (1 x 64K, 4K blocks, id 0)
2670 * 3 = internal LUN (2 x 32K, 512B blocks, ids 0,1)
2671 * 4 = internal LUN (2 x 32K, 4K blocks, ids 0,1)
2673 * Return: The size of the ASCII string returned in @buf.
2675 static ssize_t
lun_mode_store(struct device
*dev
,
2676 struct device_attribute
*attr
,
2677 const char *buf
, size_t count
)
2679 struct Scsi_Host
*shost
= class_to_shost(dev
);
2680 struct cxlflash_cfg
*cfg
= shost_priv(shost
);
2681 struct afu
*afu
= cfg
->afu
;
2685 rc
= kstrtouint(buf
, 10, &lun_mode
);
2686 if (!rc
&& (lun_mode
< 5) && (lun_mode
!= afu
->internal_lun
)) {
2687 afu
->internal_lun
= lun_mode
;
2690 * When configured for internal LUN, there is only one channel,
2691 * channel number 0, else there will be one less than the number
2692 * of fc ports for this card.
2694 if (afu
->internal_lun
)
2695 shost
->max_channel
= 0;
2697 shost
->max_channel
= PORTNUM2CHAN(cfg
->num_fc_ports
);
2700 scsi_scan_host(cfg
->host
);
2707 * ioctl_version_show() - presents the current ioctl version of the host
2708 * @dev: Generic device associated with the host.
2709 * @attr: Device attribute representing the ioctl version.
2710 * @buf: Buffer of length PAGE_SIZE to report back the ioctl version.
2712 * Return: The size of the ASCII string returned in @buf.
2714 static ssize_t
ioctl_version_show(struct device
*dev
,
2715 struct device_attribute
*attr
, char *buf
)
2719 bytes
= scnprintf(buf
, PAGE_SIZE
,
2720 "disk: %u\n", DK_CXLFLASH_VERSION_0
);
2721 bytes
+= scnprintf(buf
+ bytes
, PAGE_SIZE
- bytes
,
2722 "host: %u\n", HT_CXLFLASH_VERSION_0
);
2728 * cxlflash_show_port_lun_table() - queries and presents the port LUN table
2729 * @port: Desired port for status reporting.
2730 * @cfg: Internal structure associated with the host.
2731 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
2733 * Return: The size of the ASCII string returned in @buf or -EINVAL.
2735 static ssize_t
cxlflash_show_port_lun_table(u32 port
,
2736 struct cxlflash_cfg
*cfg
,
2739 struct device
*dev
= &cfg
->dev
->dev
;
2740 __be64 __iomem
*fc_port_luns
;
2744 WARN_ON(port
>= MAX_FC_PORTS
);
2746 if (port
>= cfg
->num_fc_ports
) {
2747 dev_info(dev
, "%s: Port %d not supported on this card.\n",
2752 fc_port_luns
= get_fc_port_luns(cfg
, port
);
2754 for (i
= 0; i
< CXLFLASH_NUM_VLUNS
; i
++)
2755 bytes
+= scnprintf(buf
+ bytes
, PAGE_SIZE
- bytes
,
2757 i
, readq_be(&fc_port_luns
[i
]));
2762 * port0_lun_table_show() - presents the current LUN table of port 0
2763 * @dev: Generic device associated with the host owning the port.
2764 * @attr: Device attribute representing the port.
2765 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
2767 * Return: The size of the ASCII string returned in @buf.
2769 static ssize_t
port0_lun_table_show(struct device
*dev
,
2770 struct device_attribute
*attr
,
2773 struct cxlflash_cfg
*cfg
= shost_priv(class_to_shost(dev
));
2775 return cxlflash_show_port_lun_table(0, cfg
, buf
);
2779 * port1_lun_table_show() - presents the current LUN table of port 1
2780 * @dev: Generic device associated with the host owning the port.
2781 * @attr: Device attribute representing the port.
2782 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
2784 * Return: The size of the ASCII string returned in @buf.
2786 static ssize_t
port1_lun_table_show(struct device
*dev
,
2787 struct device_attribute
*attr
,
2790 struct cxlflash_cfg
*cfg
= shost_priv(class_to_shost(dev
));
2792 return cxlflash_show_port_lun_table(1, cfg
, buf
);
2796 * port2_lun_table_show() - presents the current LUN table of port 2
2797 * @dev: Generic device associated with the host owning the port.
2798 * @attr: Device attribute representing the port.
2799 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
2801 * Return: The size of the ASCII string returned in @buf.
2803 static ssize_t
port2_lun_table_show(struct device
*dev
,
2804 struct device_attribute
*attr
,
2807 struct cxlflash_cfg
*cfg
= shost_priv(class_to_shost(dev
));
2809 return cxlflash_show_port_lun_table(2, cfg
, buf
);
2813 * port3_lun_table_show() - presents the current LUN table of port 3
2814 * @dev: Generic device associated with the host owning the port.
2815 * @attr: Device attribute representing the port.
2816 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
2818 * Return: The size of the ASCII string returned in @buf.
2820 static ssize_t
port3_lun_table_show(struct device
*dev
,
2821 struct device_attribute
*attr
,
2824 struct cxlflash_cfg
*cfg
= shost_priv(class_to_shost(dev
));
2826 return cxlflash_show_port_lun_table(3, cfg
, buf
);
2830 * irqpoll_weight_show() - presents the current IRQ poll weight for the host
2831 * @dev: Generic device associated with the host.
2832 * @attr: Device attribute representing the IRQ poll weight.
2833 * @buf: Buffer of length PAGE_SIZE to report back the current IRQ poll
2836 * An IRQ poll weight of 0 indicates polling is disabled.
2838 * Return: The size of the ASCII string returned in @buf.
2840 static ssize_t
irqpoll_weight_show(struct device
*dev
,
2841 struct device_attribute
*attr
, char *buf
)
2843 struct cxlflash_cfg
*cfg
= shost_priv(class_to_shost(dev
));
2844 struct afu
*afu
= cfg
->afu
;
2846 return scnprintf(buf
, PAGE_SIZE
, "%u\n", afu
->irqpoll_weight
);
2850 * irqpoll_weight_store() - sets the current IRQ poll weight for the host
2851 * @dev: Generic device associated with the host.
2852 * @attr: Device attribute representing the IRQ poll weight.
2853 * @buf: Buffer of length PAGE_SIZE containing the desired IRQ poll
2855 * @count: Length of data resizing in @buf.
2857 * An IRQ poll weight of 0 indicates polling is disabled.
2859 * Return: The size of the ASCII string returned in @buf.
2861 static ssize_t
irqpoll_weight_store(struct device
*dev
,
2862 struct device_attribute
*attr
,
2863 const char *buf
, size_t count
)
2865 struct cxlflash_cfg
*cfg
= shost_priv(class_to_shost(dev
));
2866 struct device
*cfgdev
= &cfg
->dev
->dev
;
2867 struct afu
*afu
= cfg
->afu
;
2872 rc
= kstrtouint(buf
, 10, &weight
);
2878 "Invalid IRQ poll weight. It must be 256 or less.\n");
2882 if (weight
== afu
->irqpoll_weight
) {
2884 "Current IRQ poll weight has the same weight.\n");
2888 if (afu_is_irqpoll_enabled(afu
)) {
2889 for (i
= 0; i
< afu
->num_hwqs
; i
++) {
2890 hwq
= get_hwq(afu
, i
);
2892 irq_poll_disable(&hwq
->irqpoll
);
2896 afu
->irqpoll_weight
= weight
;
2899 for (i
= 0; i
< afu
->num_hwqs
; i
++) {
2900 hwq
= get_hwq(afu
, i
);
2902 irq_poll_init(&hwq
->irqpoll
, weight
, cxlflash_irqpoll
);
2910 * num_hwqs_show() - presents the number of hardware queues for the host
2911 * @dev: Generic device associated with the host.
2912 * @attr: Device attribute representing the number of hardware queues.
2913 * @buf: Buffer of length PAGE_SIZE to report back the number of hardware
2916 * Return: The size of the ASCII string returned in @buf.
2918 static ssize_t
num_hwqs_show(struct device
*dev
,
2919 struct device_attribute
*attr
, char *buf
)
2921 struct cxlflash_cfg
*cfg
= shost_priv(class_to_shost(dev
));
2922 struct afu
*afu
= cfg
->afu
;
2924 return scnprintf(buf
, PAGE_SIZE
, "%u\n", afu
->num_hwqs
);
2928 * num_hwqs_store() - sets the number of hardware queues for the host
2929 * @dev: Generic device associated with the host.
2930 * @attr: Device attribute representing the number of hardware queues.
2931 * @buf: Buffer of length PAGE_SIZE containing the number of hardware
2933 * @count: Length of data resizing in @buf.
2935 * n > 0: num_hwqs = n
2936 * n = 0: num_hwqs = num_online_cpus()
2937 * n < 0: num_online_cpus() / abs(n)
2939 * Return: The size of the ASCII string returned in @buf.
2941 static ssize_t
num_hwqs_store(struct device
*dev
,
2942 struct device_attribute
*attr
,
2943 const char *buf
, size_t count
)
2945 struct cxlflash_cfg
*cfg
= shost_priv(class_to_shost(dev
));
2946 struct afu
*afu
= cfg
->afu
;
2948 int nhwqs
, num_hwqs
;
2950 rc
= kstrtoint(buf
, 10, &nhwqs
);
2956 else if (nhwqs
== 0)
2957 num_hwqs
= num_online_cpus();
2959 num_hwqs
= num_online_cpus() / abs(nhwqs
);
2961 afu
->desired_hwqs
= min(num_hwqs
, CXLFLASH_MAX_HWQS
);
2962 WARN_ON_ONCE(afu
->desired_hwqs
== 0);
2965 switch (cfg
->state
) {
2967 cfg
->state
= STATE_RESET
;
2969 cxlflash_mark_contexts_error(cfg
);
2970 rc
= afu_reset(cfg
);
2972 cfg
->state
= STATE_FAILTERM
;
2974 cfg
->state
= STATE_NORMAL
;
2975 wake_up_all(&cfg
->reset_waitq
);
2978 wait_event(cfg
->reset_waitq
, cfg
->state
!= STATE_RESET
);
2979 if (cfg
->state
== STATE_NORMAL
)
2982 /* Ideally should not happen */
2983 dev_err(dev
, "%s: Device is not ready, state=%d\n",
2984 __func__
, cfg
->state
);
2991 static const char *hwq_mode_name
[MAX_HWQ_MODE
] = { "rr", "tag", "cpu" };
2994 * hwq_mode_show() - presents the HWQ steering mode for the host
2995 * @dev: Generic device associated with the host.
2996 * @attr: Device attribute representing the HWQ steering mode.
2997 * @buf: Buffer of length PAGE_SIZE to report back the HWQ steering mode
2998 * as a character string.
3000 * Return: The size of the ASCII string returned in @buf.
3002 static ssize_t
hwq_mode_show(struct device
*dev
,
3003 struct device_attribute
*attr
, char *buf
)
3005 struct cxlflash_cfg
*cfg
= shost_priv(class_to_shost(dev
));
3006 struct afu
*afu
= cfg
->afu
;
3008 return scnprintf(buf
, PAGE_SIZE
, "%s\n", hwq_mode_name
[afu
->hwq_mode
]);
3012 * hwq_mode_store() - sets the HWQ steering mode for the host
3013 * @dev: Generic device associated with the host.
3014 * @attr: Device attribute representing the HWQ steering mode.
3015 * @buf: Buffer of length PAGE_SIZE containing the HWQ steering mode
3016 * as a character string.
3017 * @count: Length of data resizing in @buf.
3020 * tag = Block MQ Tagging
3021 * cpu = CPU Affinity
3023 * Return: The size of the ASCII string returned in @buf.
3025 static ssize_t
hwq_mode_store(struct device
*dev
,
3026 struct device_attribute
*attr
,
3027 const char *buf
, size_t count
)
3029 struct Scsi_Host
*shost
= class_to_shost(dev
);
3030 struct cxlflash_cfg
*cfg
= shost_priv(shost
);
3031 struct device
*cfgdev
= &cfg
->dev
->dev
;
3032 struct afu
*afu
= cfg
->afu
;
3034 u32 mode
= MAX_HWQ_MODE
;
3036 for (i
= 0; i
< MAX_HWQ_MODE
; i
++) {
3037 if (!strncmp(hwq_mode_name
[i
], buf
, strlen(hwq_mode_name
[i
]))) {
3043 if (mode
>= MAX_HWQ_MODE
) {
3044 dev_info(cfgdev
, "Invalid HWQ steering mode.\n");
3048 if ((mode
== HWQ_MODE_TAG
) && !shost_use_blk_mq(shost
)) {
3049 dev_info(cfgdev
, "SCSI-MQ is not enabled, use a different "
3050 "HWQ steering mode.\n");
3054 afu
->hwq_mode
= mode
;
3060 * mode_show() - presents the current mode of the device
3061 * @dev: Generic device associated with the device.
3062 * @attr: Device attribute representing the device mode.
3063 * @buf: Buffer of length PAGE_SIZE to report back the dev mode in ASCII.
3065 * Return: The size of the ASCII string returned in @buf.
3067 static ssize_t
mode_show(struct device
*dev
,
3068 struct device_attribute
*attr
, char *buf
)
3070 struct scsi_device
*sdev
= to_scsi_device(dev
);
3072 return scnprintf(buf
, PAGE_SIZE
, "%s\n",
3073 sdev
->hostdata
? "superpipe" : "legacy");
3079 static DEVICE_ATTR_RO(port0
);
3080 static DEVICE_ATTR_RO(port1
);
3081 static DEVICE_ATTR_RO(port2
);
3082 static DEVICE_ATTR_RO(port3
);
3083 static DEVICE_ATTR_RW(lun_mode
);
3084 static DEVICE_ATTR_RO(ioctl_version
);
3085 static DEVICE_ATTR_RO(port0_lun_table
);
3086 static DEVICE_ATTR_RO(port1_lun_table
);
3087 static DEVICE_ATTR_RO(port2_lun_table
);
3088 static DEVICE_ATTR_RO(port3_lun_table
);
3089 static DEVICE_ATTR_RW(irqpoll_weight
);
3090 static DEVICE_ATTR_RW(num_hwqs
);
3091 static DEVICE_ATTR_RW(hwq_mode
);
3093 static struct device_attribute
*cxlflash_host_attrs
[] = {
3099 &dev_attr_ioctl_version
,
3100 &dev_attr_port0_lun_table
,
3101 &dev_attr_port1_lun_table
,
3102 &dev_attr_port2_lun_table
,
3103 &dev_attr_port3_lun_table
,
3104 &dev_attr_irqpoll_weight
,
3113 static DEVICE_ATTR_RO(mode
);
3115 static struct device_attribute
*cxlflash_dev_attrs
[] = {
3123 static struct scsi_host_template driver_template
= {
3124 .module
= THIS_MODULE
,
3125 .name
= CXLFLASH_ADAPTER_NAME
,
3126 .info
= cxlflash_driver_info
,
3127 .ioctl
= cxlflash_ioctl
,
3128 .proc_name
= CXLFLASH_NAME
,
3129 .queuecommand
= cxlflash_queuecommand
,
3130 .eh_abort_handler
= cxlflash_eh_abort_handler
,
3131 .eh_device_reset_handler
= cxlflash_eh_device_reset_handler
,
3132 .eh_host_reset_handler
= cxlflash_eh_host_reset_handler
,
3133 .change_queue_depth
= cxlflash_change_queue_depth
,
3134 .cmd_per_lun
= CXLFLASH_MAX_CMDS_PER_LUN
,
3135 .can_queue
= CXLFLASH_MAX_CMDS
,
3136 .cmd_size
= sizeof(struct afu_cmd
) + __alignof__(struct afu_cmd
) - 1,
3138 .sg_tablesize
= 1, /* No scatter gather support */
3139 .max_sectors
= CXLFLASH_MAX_SECTORS
,
3140 .use_clustering
= ENABLE_CLUSTERING
,
3141 .shost_attrs
= cxlflash_host_attrs
,
3142 .sdev_attrs
= cxlflash_dev_attrs
,
3146 * Device dependent values
3148 static struct dev_dependent_vals dev_corsa_vals
= { CXLFLASH_MAX_SECTORS
,
3150 static struct dev_dependent_vals dev_flash_gt_vals
= { CXLFLASH_MAX_SECTORS
,
3151 CXLFLASH_NOTIFY_SHUTDOWN
};
3152 static struct dev_dependent_vals dev_briard_vals
= { CXLFLASH_MAX_SECTORS
,
3153 CXLFLASH_NOTIFY_SHUTDOWN
};
3156 * PCI device binding table
3158 static struct pci_device_id cxlflash_pci_table
[] = {
3159 {PCI_VENDOR_ID_IBM
, PCI_DEVICE_ID_IBM_CORSA
,
3160 PCI_ANY_ID
, PCI_ANY_ID
, 0, 0, (kernel_ulong_t
)&dev_corsa_vals
},
3161 {PCI_VENDOR_ID_IBM
, PCI_DEVICE_ID_IBM_FLASH_GT
,
3162 PCI_ANY_ID
, PCI_ANY_ID
, 0, 0, (kernel_ulong_t
)&dev_flash_gt_vals
},
3163 {PCI_VENDOR_ID_IBM
, PCI_DEVICE_ID_IBM_BRIARD
,
3164 PCI_ANY_ID
, PCI_ANY_ID
, 0, 0, (kernel_ulong_t
)&dev_briard_vals
},
3168 MODULE_DEVICE_TABLE(pci
, cxlflash_pci_table
);
3171 * cxlflash_worker_thread() - work thread handler for the AFU
3172 * @work: Work structure contained within cxlflash associated with host.
3174 * Handles the following events:
3175 * - Link reset which cannot be performed on interrupt context due to
3176 * blocking up to a few seconds
3179 static void cxlflash_worker_thread(struct work_struct
*work
)
3181 struct cxlflash_cfg
*cfg
= container_of(work
, struct cxlflash_cfg
,
3183 struct afu
*afu
= cfg
->afu
;
3184 struct device
*dev
= &cfg
->dev
->dev
;
3185 __be64 __iomem
*fc_port_regs
;
3189 /* Avoid MMIO if the device has failed */
3191 if (cfg
->state
!= STATE_NORMAL
)
3194 spin_lock_irqsave(cfg
->host
->host_lock
, lock_flags
);
3196 if (cfg
->lr_state
== LINK_RESET_REQUIRED
) {
3197 port
= cfg
->lr_port
;
3199 dev_err(dev
, "%s: invalid port index %d\n",
3202 spin_unlock_irqrestore(cfg
->host
->host_lock
,
3205 /* The reset can block... */
3206 fc_port_regs
= get_fc_port_regs(cfg
, port
);
3207 afu_link_reset(afu
, port
, fc_port_regs
);
3208 spin_lock_irqsave(cfg
->host
->host_lock
, lock_flags
);
3211 cfg
->lr_state
= LINK_RESET_COMPLETE
;
3214 spin_unlock_irqrestore(cfg
->host
->host_lock
, lock_flags
);
3216 if (atomic_dec_if_positive(&cfg
->scan_host_needed
) >= 0)
3217 scsi_scan_host(cfg
->host
);
3221 * cxlflash_chr_open() - character device open handler
3222 * @inode: Device inode associated with this character device.
3223 * @file: File pointer for this device.
3225 * Only users with admin privileges are allowed to open the character device.
3227 * Return: 0 on success, -errno on failure
3229 static int cxlflash_chr_open(struct inode
*inode
, struct file
*file
)
3231 struct cxlflash_cfg
*cfg
;
3233 if (!capable(CAP_SYS_ADMIN
))
3236 cfg
= container_of(inode
->i_cdev
, struct cxlflash_cfg
, cdev
);
3237 file
->private_data
= cfg
;
3243 * decode_hioctl() - translates encoded host ioctl to easily identifiable string
3244 * @cmd: The host ioctl command to decode.
3246 * Return: A string identifying the decoded host ioctl.
3248 static char *decode_hioctl(int cmd
)
3251 case HT_CXLFLASH_LUN_PROVISION
:
3252 return __stringify_1(HT_CXLFLASH_LUN_PROVISION
);
3259 * cxlflash_lun_provision() - host LUN provisioning handler
3260 * @cfg: Internal structure associated with the host.
3261 * @arg: Kernel copy of userspace ioctl data structure.
3263 * Return: 0 on success, -errno on failure
3265 static int cxlflash_lun_provision(struct cxlflash_cfg
*cfg
,
3266 struct ht_cxlflash_lun_provision
*lunprov
)
3268 struct afu
*afu
= cfg
->afu
;
3269 struct device
*dev
= &cfg
->dev
->dev
;
3270 struct sisl_ioarcb rcb
;
3271 struct sisl_ioasa asa
;
3272 __be64 __iomem
*fc_port_regs
;
3273 u16 port
= lunprov
->port
;
3274 u16 scmd
= lunprov
->hdr
.subcmd
;
3281 if (!afu_is_lun_provision(afu
)) {
3286 if (port
>= cfg
->num_fc_ports
) {
3292 case HT_CXLFLASH_LUN_PROVISION_SUBCMD_CREATE_LUN
:
3293 type
= SISL_AFU_LUN_PROVISION_CREATE
;
3294 size
= lunprov
->size
;
3297 case HT_CXLFLASH_LUN_PROVISION_SUBCMD_DELETE_LUN
:
3298 type
= SISL_AFU_LUN_PROVISION_DELETE
;
3300 lun_id
= lunprov
->lun_id
;
3302 case HT_CXLFLASH_LUN_PROVISION_SUBCMD_QUERY_PORT
:
3303 fc_port_regs
= get_fc_port_regs(cfg
, port
);
3305 reg
= readq_be(&fc_port_regs
[FC_MAX_NUM_LUNS
/ 8]);
3306 lunprov
->max_num_luns
= reg
;
3307 reg
= readq_be(&fc_port_regs
[FC_CUR_NUM_LUNS
/ 8]);
3308 lunprov
->cur_num_luns
= reg
;
3309 reg
= readq_be(&fc_port_regs
[FC_MAX_CAP_PORT
/ 8]);
3310 lunprov
->max_cap_port
= reg
;
3311 reg
= readq_be(&fc_port_regs
[FC_CUR_CAP_PORT
/ 8]);
3312 lunprov
->cur_cap_port
= reg
;
3320 memset(&rcb
, 0, sizeof(rcb
));
3321 memset(&asa
, 0, sizeof(asa
));
3322 rcb
.req_flags
= SISL_REQ_FLAGS_AFU_CMD
;
3323 rcb
.lun_id
= lun_id
;
3324 rcb
.msi
= SISL_MSI_RRQ_UPDATED
;
3325 rcb
.timeout
= MC_LUN_PROV_TIMEOUT
;
3328 rcb
.cdb
[0] = SISL_AFU_CMD_LUN_PROVISION
;
3331 put_unaligned_be64(size
, &rcb
.cdb
[8]);
3333 rc
= send_afu_cmd(afu
, &rcb
);
3335 dev_err(dev
, "%s: send_afu_cmd failed rc=%d asc=%08x afux=%x\n",
3336 __func__
, rc
, asa
.ioasc
, asa
.afu_extra
);
3340 if (scmd
== HT_CXLFLASH_LUN_PROVISION_SUBCMD_CREATE_LUN
) {
3341 lunprov
->lun_id
= (u64
)asa
.lunid_hi
<< 32 | asa
.lunid_lo
;
3342 memcpy(lunprov
->wwid
, asa
.wwid
, sizeof(lunprov
->wwid
));
3345 dev_dbg(dev
, "%s: returning rc=%d\n", __func__
, rc
);
3350 * cxlflash_afu_debug() - host AFU debug handler
3351 * @cfg: Internal structure associated with the host.
3352 * @arg: Kernel copy of userspace ioctl data structure.
3354 * For debug requests requiring a data buffer, always provide an aligned
3355 * (cache line) buffer to the AFU to appease any alignment requirements.
3357 * Return: 0 on success, -errno on failure
3359 static int cxlflash_afu_debug(struct cxlflash_cfg
*cfg
,
3360 struct ht_cxlflash_afu_debug
*afu_dbg
)
3362 struct afu
*afu
= cfg
->afu
;
3363 struct device
*dev
= &cfg
->dev
->dev
;
3364 struct sisl_ioarcb rcb
;
3365 struct sisl_ioasa asa
;
3368 void __user
*ubuf
= (__force
void __user
*)afu_dbg
->data_ea
;
3369 u16 req_flags
= SISL_REQ_FLAGS_AFU_CMD
;
3370 u32 ulen
= afu_dbg
->data_len
;
3371 bool is_write
= afu_dbg
->hdr
.flags
& HT_CXLFLASH_HOST_WRITE
;
3374 if (!afu_is_afu_debug(afu
)) {
3380 req_flags
|= SISL_REQ_FLAGS_SUP_UNDERRUN
;
3382 if (ulen
> HT_CXLFLASH_AFU_DEBUG_MAX_DATA_LEN
) {
3387 if (unlikely(!access_ok(is_write
? VERIFY_READ
: VERIFY_WRITE
,
3393 buf
= kmalloc(ulen
+ cache_line_size() - 1, GFP_KERNEL
);
3394 if (unlikely(!buf
)) {
3399 kbuf
= PTR_ALIGN(buf
, cache_line_size());
3402 req_flags
|= SISL_REQ_FLAGS_HOST_WRITE
;
3404 if (copy_from_user(kbuf
, ubuf
, ulen
)) {
3411 memset(&rcb
, 0, sizeof(rcb
));
3412 memset(&asa
, 0, sizeof(asa
));
3414 rcb
.req_flags
= req_flags
;
3415 rcb
.msi
= SISL_MSI_RRQ_UPDATED
;
3416 rcb
.timeout
= MC_AFU_DEBUG_TIMEOUT
;
3420 rcb
.data_len
= ulen
;
3421 rcb
.data_ea
= (uintptr_t)kbuf
;
3424 rcb
.cdb
[0] = SISL_AFU_CMD_DEBUG
;
3425 memcpy(&rcb
.cdb
[4], afu_dbg
->afu_subcmd
,
3426 HT_CXLFLASH_AFU_DEBUG_SUBCMD_LEN
);
3428 rc
= send_afu_cmd(afu
, &rcb
);
3430 dev_err(dev
, "%s: send_afu_cmd failed rc=%d asc=%08x afux=%x\n",
3431 __func__
, rc
, asa
.ioasc
, asa
.afu_extra
);
3435 if (ulen
&& !is_write
) {
3436 if (copy_to_user(ubuf
, kbuf
, ulen
))
3441 dev_dbg(dev
, "%s: returning rc=%d\n", __func__
, rc
);
3446 * cxlflash_chr_ioctl() - character device IOCTL handler
3447 * @file: File pointer for this device.
3448 * @cmd: IOCTL command.
3449 * @arg: Userspace ioctl data structure.
3451 * A read/write semaphore is used to implement a 'drain' of currently
3452 * running ioctls. The read semaphore is taken at the beginning of each
3453 * ioctl thread and released upon concluding execution. Additionally the
3454 * semaphore should be released and then reacquired in any ioctl execution
3455 * path which will wait for an event to occur that is outside the scope of
3456 * the ioctl (i.e. an adapter reset). To drain the ioctls currently running,
3457 * a thread simply needs to acquire the write semaphore.
3459 * Return: 0 on success, -errno on failure
3461 static long cxlflash_chr_ioctl(struct file
*file
, unsigned int cmd
,
3464 typedef int (*hioctl
) (struct cxlflash_cfg
*, void *);
3466 struct cxlflash_cfg
*cfg
= file
->private_data
;
3467 struct device
*dev
= &cfg
->dev
->dev
;
3468 char buf
[sizeof(union cxlflash_ht_ioctls
)];
3469 void __user
*uarg
= (void __user
*)arg
;
3470 struct ht_cxlflash_hdr
*hdr
;
3472 bool known_ioctl
= false;
3475 hioctl do_ioctl
= NULL
;
3477 static const struct {
3480 } ioctl_tbl
[] = { /* NOTE: order matters here */
3481 { sizeof(struct ht_cxlflash_lun_provision
),
3482 (hioctl
)cxlflash_lun_provision
},
3483 { sizeof(struct ht_cxlflash_afu_debug
),
3484 (hioctl
)cxlflash_afu_debug
},
3487 /* Hold read semaphore so we can drain if needed */
3488 down_read(&cfg
->ioctl_rwsem
);
3490 dev_dbg(dev
, "%s: cmd=%u idx=%d tbl_size=%lu\n",
3491 __func__
, cmd
, idx
, sizeof(ioctl_tbl
));
3494 case HT_CXLFLASH_LUN_PROVISION
:
3495 case HT_CXLFLASH_AFU_DEBUG
:
3497 idx
= _IOC_NR(HT_CXLFLASH_LUN_PROVISION
) - _IOC_NR(cmd
);
3498 size
= ioctl_tbl
[idx
].size
;
3499 do_ioctl
= ioctl_tbl
[idx
].ioctl
;
3501 if (likely(do_ioctl
))
3510 if (unlikely(copy_from_user(&buf
, uarg
, size
))) {
3511 dev_err(dev
, "%s: copy_from_user() fail "
3512 "size=%lu cmd=%d (%s) uarg=%p\n",
3513 __func__
, size
, cmd
, decode_hioctl(cmd
), uarg
);
3518 hdr
= (struct ht_cxlflash_hdr
*)&buf
;
3519 if (hdr
->version
!= HT_CXLFLASH_VERSION_0
) {
3520 dev_dbg(dev
, "%s: Version %u not supported for %s\n",
3521 __func__
, hdr
->version
, decode_hioctl(cmd
));
3526 if (hdr
->rsvd
[0] || hdr
->rsvd
[1] || hdr
->return_flags
) {
3527 dev_dbg(dev
, "%s: Reserved/rflags populated\n", __func__
);
3532 rc
= do_ioctl(cfg
, (void *)&buf
);
3534 if (unlikely(copy_to_user(uarg
, &buf
, size
))) {
3535 dev_err(dev
, "%s: copy_to_user() fail "
3536 "size=%lu cmd=%d (%s) uarg=%p\n",
3537 __func__
, size
, cmd
, decode_hioctl(cmd
), uarg
);
3541 /* fall through to exit */
3544 up_read(&cfg
->ioctl_rwsem
);
3545 if (unlikely(rc
&& known_ioctl
))
3546 dev_err(dev
, "%s: ioctl %s (%08X) returned rc=%d\n",
3547 __func__
, decode_hioctl(cmd
), cmd
, rc
);
3549 dev_dbg(dev
, "%s: ioctl %s (%08X) returned rc=%d\n",
3550 __func__
, decode_hioctl(cmd
), cmd
, rc
);
3555 * Character device file operations
3557 static const struct file_operations cxlflash_chr_fops
= {
3558 .owner
= THIS_MODULE
,
3559 .open
= cxlflash_chr_open
,
3560 .unlocked_ioctl
= cxlflash_chr_ioctl
,
3561 .compat_ioctl
= cxlflash_chr_ioctl
,
3565 * init_chrdev() - initialize the character device for the host
3566 * @cfg: Internal structure associated with the host.
3568 * Return: 0 on success, -errno on failure
3570 static int init_chrdev(struct cxlflash_cfg
*cfg
)
3572 struct device
*dev
= &cfg
->dev
->dev
;
3573 struct device
*char_dev
;
3578 minor
= cxlflash_get_minor();
3579 if (unlikely(minor
< 0)) {
3580 dev_err(dev
, "%s: Exhausted allowed adapters\n", __func__
);
3585 devno
= MKDEV(cxlflash_major
, minor
);
3586 cdev_init(&cfg
->cdev
, &cxlflash_chr_fops
);
3588 rc
= cdev_add(&cfg
->cdev
, devno
, 1);
3590 dev_err(dev
, "%s: cdev_add failed rc=%d\n", __func__
, rc
);
3594 char_dev
= device_create(cxlflash_class
, NULL
, devno
,
3595 NULL
, "cxlflash%d", minor
);
3596 if (IS_ERR(char_dev
)) {
3597 rc
= PTR_ERR(char_dev
);
3598 dev_err(dev
, "%s: device_create failed rc=%d\n",
3603 cfg
->chardev
= char_dev
;
3605 dev_dbg(dev
, "%s: returning rc=%d\n", __func__
, rc
);
3608 cdev_del(&cfg
->cdev
);
3610 cxlflash_put_minor(minor
);
3615 * cxlflash_probe() - PCI entry point to add host
3616 * @pdev: PCI device associated with the host.
3617 * @dev_id: PCI device id associated with device.
3619 * The device will initially start out in a 'probing' state and
3620 * transition to the 'normal' state at the end of a successful
3621 * probe. Should an EEH event occur during probe, the notification
3622 * thread (error_detected()) will wait until the probe handler
3623 * is nearly complete. At that time, the device will be moved to
3624 * a 'probed' state and the EEH thread woken up to drive the slot
3625 * reset and recovery (device moves to 'normal' state). Meanwhile,
3626 * the probe will be allowed to exit successfully.
3628 * Return: 0 on success, -errno on failure
3630 static int cxlflash_probe(struct pci_dev
*pdev
,
3631 const struct pci_device_id
*dev_id
)
3633 struct Scsi_Host
*host
;
3634 struct cxlflash_cfg
*cfg
= NULL
;
3635 struct device
*dev
= &pdev
->dev
;
3636 struct dev_dependent_vals
*ddv
;
3640 dev_dbg(&pdev
->dev
, "%s: Found CXLFLASH with IRQ: %d\n",
3641 __func__
, pdev
->irq
);
3643 ddv
= (struct dev_dependent_vals
*)dev_id
->driver_data
;
3644 driver_template
.max_sectors
= ddv
->max_sectors
;
3646 host
= scsi_host_alloc(&driver_template
, sizeof(struct cxlflash_cfg
));
3648 dev_err(dev
, "%s: scsi_host_alloc failed\n", __func__
);
3653 host
->max_id
= CXLFLASH_MAX_NUM_TARGETS_PER_BUS
;
3654 host
->max_lun
= CXLFLASH_MAX_NUM_LUNS_PER_TARGET
;
3655 host
->unique_id
= host
->host_no
;
3656 host
->max_cmd_len
= CXLFLASH_MAX_CDB_LEN
;
3658 cfg
= shost_priv(host
);
3660 rc
= alloc_mem(cfg
);
3662 dev_err(dev
, "%s: alloc_mem failed\n", __func__
);
3664 scsi_host_put(cfg
->host
);
3668 cfg
->init_state
= INIT_STATE_NONE
;
3670 cfg
->cxl_fops
= cxlflash_cxl_fops
;
3673 * Promoted LUNs move to the top of the LUN table. The rest stay on
3674 * the bottom half. The bottom half grows from the end (index = 255),
3675 * whereas the top half grows from the beginning (index = 0).
3677 * Initialize the last LUN index for all possible ports.
3679 cfg
->promote_lun_index
= 0;
3681 for (k
= 0; k
< MAX_FC_PORTS
; k
++)
3682 cfg
->last_lun_index
[k
] = CXLFLASH_NUM_VLUNS
/2 - 1;
3684 cfg
->dev_id
= (struct pci_device_id
*)dev_id
;
3686 init_waitqueue_head(&cfg
->tmf_waitq
);
3687 init_waitqueue_head(&cfg
->reset_waitq
);
3689 INIT_WORK(&cfg
->work_q
, cxlflash_worker_thread
);
3690 cfg
->lr_state
= LINK_RESET_INVALID
;
3692 spin_lock_init(&cfg
->tmf_slock
);
3693 mutex_init(&cfg
->ctx_tbl_list_mutex
);
3694 mutex_init(&cfg
->ctx_recovery_mutex
);
3695 init_rwsem(&cfg
->ioctl_rwsem
);
3696 INIT_LIST_HEAD(&cfg
->ctx_err_recovery
);
3697 INIT_LIST_HEAD(&cfg
->lluns
);
3699 pci_set_drvdata(pdev
, cfg
);
3701 cfg
->cxl_afu
= cxl_pci_to_afu(pdev
);
3705 dev_err(dev
, "%s: init_pci failed rc=%d\n", __func__
, rc
);
3708 cfg
->init_state
= INIT_STATE_PCI
;
3711 if (rc
&& !wq_has_sleeper(&cfg
->reset_waitq
)) {
3712 dev_err(dev
, "%s: init_afu failed rc=%d\n", __func__
, rc
);
3715 cfg
->init_state
= INIT_STATE_AFU
;
3717 rc
= init_scsi(cfg
);
3719 dev_err(dev
, "%s: init_scsi failed rc=%d\n", __func__
, rc
);
3722 cfg
->init_state
= INIT_STATE_SCSI
;
3724 rc
= init_chrdev(cfg
);
3726 dev_err(dev
, "%s: init_chrdev failed rc=%d\n", __func__
, rc
);
3729 cfg
->init_state
= INIT_STATE_CDEV
;
3731 if (wq_has_sleeper(&cfg
->reset_waitq
)) {
3732 cfg
->state
= STATE_PROBED
;
3733 wake_up_all(&cfg
->reset_waitq
);
3735 cfg
->state
= STATE_NORMAL
;
3737 dev_dbg(dev
, "%s: returning rc=%d\n", __func__
, rc
);
3741 cxlflash_remove(pdev
);
3746 * cxlflash_pci_error_detected() - called when a PCI error is detected
3747 * @pdev: PCI device struct.
3748 * @state: PCI channel state.
3750 * When an EEH occurs during an active reset, wait until the reset is
3751 * complete and then take action based upon the device state.
3753 * Return: PCI_ERS_RESULT_NEED_RESET or PCI_ERS_RESULT_DISCONNECT
3755 static pci_ers_result_t
cxlflash_pci_error_detected(struct pci_dev
*pdev
,
3756 pci_channel_state_t state
)
3759 struct cxlflash_cfg
*cfg
= pci_get_drvdata(pdev
);
3760 struct device
*dev
= &cfg
->dev
->dev
;
3762 dev_dbg(dev
, "%s: pdev=%p state=%u\n", __func__
, pdev
, state
);
3765 case pci_channel_io_frozen
:
3766 wait_event(cfg
->reset_waitq
, cfg
->state
!= STATE_RESET
&&
3767 cfg
->state
!= STATE_PROBING
);
3768 if (cfg
->state
== STATE_FAILTERM
)
3769 return PCI_ERS_RESULT_DISCONNECT
;
3771 cfg
->state
= STATE_RESET
;
3772 scsi_block_requests(cfg
->host
);
3774 rc
= cxlflash_mark_contexts_error(cfg
);
3776 dev_err(dev
, "%s: Failed to mark user contexts rc=%d\n",
3779 return PCI_ERS_RESULT_NEED_RESET
;
3780 case pci_channel_io_perm_failure
:
3781 cfg
->state
= STATE_FAILTERM
;
3782 wake_up_all(&cfg
->reset_waitq
);
3783 scsi_unblock_requests(cfg
->host
);
3784 return PCI_ERS_RESULT_DISCONNECT
;
3788 return PCI_ERS_RESULT_NEED_RESET
;
3792 * cxlflash_pci_slot_reset() - called when PCI slot has been reset
3793 * @pdev: PCI device struct.
3795 * This routine is called by the pci error recovery code after the PCI
3796 * slot has been reset, just before we should resume normal operations.
3798 * Return: PCI_ERS_RESULT_RECOVERED or PCI_ERS_RESULT_DISCONNECT
3800 static pci_ers_result_t
cxlflash_pci_slot_reset(struct pci_dev
*pdev
)
3803 struct cxlflash_cfg
*cfg
= pci_get_drvdata(pdev
);
3804 struct device
*dev
= &cfg
->dev
->dev
;
3806 dev_dbg(dev
, "%s: pdev=%p\n", __func__
, pdev
);
3810 dev_err(dev
, "%s: EEH recovery failed rc=%d\n", __func__
, rc
);
3811 return PCI_ERS_RESULT_DISCONNECT
;
3814 return PCI_ERS_RESULT_RECOVERED
;
3818 * cxlflash_pci_resume() - called when normal operation can resume
3819 * @pdev: PCI device struct
3821 static void cxlflash_pci_resume(struct pci_dev
*pdev
)
3823 struct cxlflash_cfg
*cfg
= pci_get_drvdata(pdev
);
3824 struct device
*dev
= &cfg
->dev
->dev
;
3826 dev_dbg(dev
, "%s: pdev=%p\n", __func__
, pdev
);
3828 cfg
->state
= STATE_NORMAL
;
3829 wake_up_all(&cfg
->reset_waitq
);
3830 scsi_unblock_requests(cfg
->host
);
3834 * cxlflash_devnode() - provides devtmpfs for devices in the cxlflash class
3835 * @dev: Character device.
3836 * @mode: Mode that can be used to verify access.
3838 * Return: Allocated string describing the devtmpfs structure.
3840 static char *cxlflash_devnode(struct device
*dev
, umode_t
*mode
)
3842 return kasprintf(GFP_KERNEL
, "cxlflash/%s", dev_name(dev
));
3846 * cxlflash_class_init() - create character device class
3848 * Return: 0 on success, -errno on failure
3850 static int cxlflash_class_init(void)
3855 rc
= alloc_chrdev_region(&devno
, 0, CXLFLASH_MAX_ADAPTERS
, "cxlflash");
3857 pr_err("%s: alloc_chrdev_region failed rc=%d\n", __func__
, rc
);
3861 cxlflash_major
= MAJOR(devno
);
3863 cxlflash_class
= class_create(THIS_MODULE
, "cxlflash");
3864 if (IS_ERR(cxlflash_class
)) {
3865 rc
= PTR_ERR(cxlflash_class
);
3866 pr_err("%s: class_create failed rc=%d\n", __func__
, rc
);
3870 cxlflash_class
->devnode
= cxlflash_devnode
;
3872 pr_debug("%s: returning rc=%d\n", __func__
, rc
);
3875 unregister_chrdev_region(devno
, CXLFLASH_MAX_ADAPTERS
);
3880 * cxlflash_class_exit() - destroy character device class
3882 static void cxlflash_class_exit(void)
3884 dev_t devno
= MKDEV(cxlflash_major
, 0);
3886 class_destroy(cxlflash_class
);
3887 unregister_chrdev_region(devno
, CXLFLASH_MAX_ADAPTERS
);
3890 static const struct pci_error_handlers cxlflash_err_handler
= {
3891 .error_detected
= cxlflash_pci_error_detected
,
3892 .slot_reset
= cxlflash_pci_slot_reset
,
3893 .resume
= cxlflash_pci_resume
,
3897 * PCI device structure
3899 static struct pci_driver cxlflash_driver
= {
3900 .name
= CXLFLASH_NAME
,
3901 .id_table
= cxlflash_pci_table
,
3902 .probe
= cxlflash_probe
,
3903 .remove
= cxlflash_remove
,
3904 .shutdown
= cxlflash_remove
,
3905 .err_handler
= &cxlflash_err_handler
,
3909 * init_cxlflash() - module entry point
3911 * Return: 0 on success, -errno on failure
3913 static int __init
init_cxlflash(void)
3918 cxlflash_list_init();
3919 rc
= cxlflash_class_init();
3923 rc
= pci_register_driver(&cxlflash_driver
);
3927 pr_debug("%s: returning rc=%d\n", __func__
, rc
);
3930 cxlflash_class_exit();
3935 * exit_cxlflash() - module exit point
3937 static void __exit
exit_cxlflash(void)
3939 cxlflash_term_global_luns();
3940 cxlflash_free_errpage();
3942 pci_unregister_driver(&cxlflash_driver
);
3943 cxlflash_class_exit();
3946 module_init(init_cxlflash
);
3947 module_exit(exit_cxlflash
);