2 * CXL Flash Device Driver
4 * Written by: Manoj N. Kumar <manoj@linux.vnet.ibm.com>, IBM Corporation
5 * Matthew R. Ochs <mrochs@linux.vnet.ibm.com>, IBM Corporation
7 * Copyright (C) 2015 IBM Corporation
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
15 #include <linux/delay.h>
16 #include <linux/list.h>
17 #include <linux/module.h>
18 #include <linux/pci.h>
20 #include <asm/unaligned.h>
24 #include <scsi/scsi_cmnd.h>
25 #include <scsi/scsi_host.h>
26 #include <uapi/scsi/cxlflash_ioctl.h>
32 MODULE_DESCRIPTION(CXLFLASH_ADAPTER_NAME
);
33 MODULE_AUTHOR("Manoj N. Kumar <manoj@linux.vnet.ibm.com>");
34 MODULE_AUTHOR("Matthew R. Ochs <mrochs@linux.vnet.ibm.com>");
35 MODULE_LICENSE("GPL");
38 * process_cmd_err() - command error handler
39 * @cmd: AFU command that experienced the error.
40 * @scp: SCSI command associated with the AFU command in error.
42 * Translates error bits from AFU command to SCSI command results.
44 static void process_cmd_err(struct afu_cmd
*cmd
, struct scsi_cmnd
*scp
)
46 struct afu
*afu
= cmd
->parent
;
47 struct cxlflash_cfg
*cfg
= afu
->parent
;
48 struct device
*dev
= &cfg
->dev
->dev
;
49 struct sisl_ioarcb
*ioarcb
;
50 struct sisl_ioasa
*ioasa
;
59 if (ioasa
->rc
.flags
& SISL_RC_FLAGS_UNDERRUN
) {
61 scsi_set_resid(scp
, resid
);
62 dev_dbg(dev
, "%s: cmd underrun cmd = %p scp = %p, resid = %d\n",
63 __func__
, cmd
, scp
, resid
);
66 if (ioasa
->rc
.flags
& SISL_RC_FLAGS_OVERRUN
) {
67 dev_dbg(dev
, "%s: cmd underrun cmd = %p scp = %p\n",
69 scp
->result
= (DID_ERROR
<< 16);
72 dev_dbg(dev
, "%s: cmd failed afu_rc=%02x scsi_rc=%02x fc_rc=%02x "
73 "afu_extra=%02x scsi_extra=%02x fc_extra=%02x\n", __func__
,
74 ioasa
->rc
.afu_rc
, ioasa
->rc
.scsi_rc
, ioasa
->rc
.fc_rc
,
75 ioasa
->afu_extra
, ioasa
->scsi_extra
, ioasa
->fc_extra
);
77 if (ioasa
->rc
.scsi_rc
) {
78 /* We have a SCSI status */
79 if (ioasa
->rc
.flags
& SISL_RC_FLAGS_SENSE_VALID
) {
80 memcpy(scp
->sense_buffer
, ioasa
->sense_data
,
82 scp
->result
= ioasa
->rc
.scsi_rc
;
84 scp
->result
= ioasa
->rc
.scsi_rc
| (DID_ERROR
<< 16);
88 * We encountered an error. Set scp->result based on nature
91 if (ioasa
->rc
.fc_rc
) {
92 /* We have an FC status */
93 switch (ioasa
->rc
.fc_rc
) {
94 case SISL_FC_RC_LINKDOWN
:
95 scp
->result
= (DID_REQUEUE
<< 16);
97 case SISL_FC_RC_RESID
:
98 /* This indicates an FCP resid underrun */
99 if (!(ioasa
->rc
.flags
& SISL_RC_FLAGS_OVERRUN
)) {
100 /* If the SISL_RC_FLAGS_OVERRUN flag was set,
101 * then we will handle this error else where.
102 * If not then we must handle it here.
103 * This is probably an AFU bug.
105 scp
->result
= (DID_ERROR
<< 16);
108 case SISL_FC_RC_RESIDERR
:
109 /* Resid mismatch between adapter and device */
110 case SISL_FC_RC_TGTABORT
:
111 case SISL_FC_RC_ABORTOK
:
112 case SISL_FC_RC_ABORTFAIL
:
113 case SISL_FC_RC_NOLOGI
:
114 case SISL_FC_RC_ABORTPEND
:
115 case SISL_FC_RC_WRABORTPEND
:
116 case SISL_FC_RC_NOEXP
:
117 case SISL_FC_RC_INUSE
:
118 scp
->result
= (DID_ERROR
<< 16);
123 if (ioasa
->rc
.afu_rc
) {
124 /* We have an AFU error */
125 switch (ioasa
->rc
.afu_rc
) {
126 case SISL_AFU_RC_NO_CHANNELS
:
127 scp
->result
= (DID_NO_CONNECT
<< 16);
129 case SISL_AFU_RC_DATA_DMA_ERR
:
130 switch (ioasa
->afu_extra
) {
131 case SISL_AFU_DMA_ERR_PAGE_IN
:
133 scp
->result
= (DID_IMM_RETRY
<< 16);
135 case SISL_AFU_DMA_ERR_INVALID_EA
:
137 scp
->result
= (DID_ERROR
<< 16);
140 case SISL_AFU_RC_OUT_OF_DATA_BUFS
:
142 scp
->result
= (DID_ALLOC_FAILURE
<< 16);
145 scp
->result
= (DID_ERROR
<< 16);
151 * cmd_complete() - command completion handler
152 * @cmd: AFU command that has completed.
154 * Prepares and submits command that has either completed or timed out to
155 * the SCSI stack. Checks AFU command back into command pool for non-internal
156 * (cmd->scp populated) commands.
158 static void cmd_complete(struct afu_cmd
*cmd
)
160 struct scsi_cmnd
*scp
;
162 struct afu
*afu
= cmd
->parent
;
163 struct cxlflash_cfg
*cfg
= afu
->parent
;
164 struct device
*dev
= &cfg
->dev
->dev
;
165 struct hwq
*hwq
= get_hwq(afu
, cmd
->hwq_index
);
168 spin_lock_irqsave(&hwq
->hsq_slock
, lock_flags
);
169 list_del(&cmd
->list
);
170 spin_unlock_irqrestore(&hwq
->hsq_slock
, lock_flags
);
174 if (unlikely(cmd
->sa
.ioasc
))
175 process_cmd_err(cmd
, scp
);
177 scp
->result
= (DID_OK
<< 16);
179 cmd_is_tmf
= cmd
->cmd_tmf
;
181 dev_dbg_ratelimited(dev
, "%s:scp=%p result=%08x ioasc=%08x\n",
182 __func__
, scp
, scp
->result
, cmd
->sa
.ioasc
);
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
);
193 complete(&cmd
->cevent
);
197 * context_reset() - reset context via specified register
198 * @hwq: Hardware queue owning the context to be reset.
199 * @reset_reg: MMIO register to perform reset.
201 * Return: 0 on success, -errno on failure
203 static int context_reset(struct hwq
*hwq
, __be64 __iomem
*reset_reg
)
205 struct cxlflash_cfg
*cfg
= hwq
->afu
->parent
;
206 struct device
*dev
= &cfg
->dev
->dev
;
211 dev_dbg(dev
, "%s: hwq=%p\n", __func__
, hwq
);
213 writeq_be(val
, reset_reg
);
215 val
= readq_be(reset_reg
);
216 if ((val
& 0x1) == 0x0) {
221 /* Double delay each time */
223 } while (nretry
++ < MC_ROOM_RETRY_CNT
);
225 dev_dbg(dev
, "%s: returning rc=%d, val=%016llx nretry=%d\n",
226 __func__
, rc
, val
, nretry
);
231 * context_reset_ioarrin() - reset context via IOARRIN register
232 * @hwq: Hardware queue owning the context to be reset.
234 * Return: 0 on success, -errno on failure
236 static int context_reset_ioarrin(struct hwq
*hwq
)
238 return context_reset(hwq
, &hwq
->host_map
->ioarrin
);
242 * context_reset_sq() - reset context via SQ_CONTEXT_RESET register
243 * @hwq: Hardware queue owning the context to be reset.
245 * Return: 0 on success, -errno on failure
247 static int context_reset_sq(struct hwq
*hwq
)
249 return context_reset(hwq
, &hwq
->host_map
->sq_ctx_reset
);
253 * send_cmd_ioarrin() - sends an AFU command via IOARRIN register
254 * @afu: AFU associated with the host.
255 * @cmd: AFU command to send.
258 * 0 on success, SCSI_MLQUEUE_HOST_BUSY on failure
260 static int send_cmd_ioarrin(struct afu
*afu
, struct afu_cmd
*cmd
)
262 struct cxlflash_cfg
*cfg
= afu
->parent
;
263 struct device
*dev
= &cfg
->dev
->dev
;
264 struct hwq
*hwq
= get_hwq(afu
, cmd
->hwq_index
);
270 * To avoid the performance penalty of MMIO, spread the update of
271 * 'room' over multiple commands.
273 spin_lock_irqsave(&hwq
->hsq_slock
, lock_flags
);
274 if (--hwq
->room
< 0) {
275 room
= readq_be(&hwq
->host_map
->cmd_room
);
277 dev_dbg_ratelimited(dev
, "%s: no cmd_room to send "
278 "0x%02X, room=0x%016llX\n",
279 __func__
, cmd
->rcb
.cdb
[0], room
);
281 rc
= SCSI_MLQUEUE_HOST_BUSY
;
284 hwq
->room
= room
- 1;
287 list_add(&cmd
->list
, &hwq
->pending_cmds
);
288 writeq_be((u64
)&cmd
->rcb
, &hwq
->host_map
->ioarrin
);
290 spin_unlock_irqrestore(&hwq
->hsq_slock
, lock_flags
);
291 dev_dbg(dev
, "%s: cmd=%p len=%u ea=%016llx rc=%d\n", __func__
,
292 cmd
, cmd
->rcb
.data_len
, cmd
->rcb
.data_ea
, rc
);
297 * send_cmd_sq() - sends an AFU command via SQ ring
298 * @afu: AFU associated with the host.
299 * @cmd: AFU command to send.
302 * 0 on success, SCSI_MLQUEUE_HOST_BUSY on failure
304 static int send_cmd_sq(struct afu
*afu
, struct afu_cmd
*cmd
)
306 struct cxlflash_cfg
*cfg
= afu
->parent
;
307 struct device
*dev
= &cfg
->dev
->dev
;
308 struct hwq
*hwq
= get_hwq(afu
, cmd
->hwq_index
);
313 newval
= atomic_dec_if_positive(&hwq
->hsq_credits
);
315 rc
= SCSI_MLQUEUE_HOST_BUSY
;
319 cmd
->rcb
.ioasa
= &cmd
->sa
;
321 spin_lock_irqsave(&hwq
->hsq_slock
, lock_flags
);
323 *hwq
->hsq_curr
= cmd
->rcb
;
324 if (hwq
->hsq_curr
< hwq
->hsq_end
)
327 hwq
->hsq_curr
= hwq
->hsq_start
;
329 list_add(&cmd
->list
, &hwq
->pending_cmds
);
330 writeq_be((u64
)hwq
->hsq_curr
, &hwq
->host_map
->sq_tail
);
332 spin_unlock_irqrestore(&hwq
->hsq_slock
, lock_flags
);
334 dev_dbg(dev
, "%s: cmd=%p len=%u ea=%016llx ioasa=%p rc=%d curr=%p "
335 "head=%016llx tail=%016llx\n", __func__
, cmd
, cmd
->rcb
.data_len
,
336 cmd
->rcb
.data_ea
, cmd
->rcb
.ioasa
, rc
, hwq
->hsq_curr
,
337 readq_be(&hwq
->host_map
->sq_head
),
338 readq_be(&hwq
->host_map
->sq_tail
));
343 * wait_resp() - polls for a response or timeout to a sent AFU command
344 * @afu: AFU associated with the host.
345 * @cmd: AFU command that was sent.
347 * Return: 0 on success, -errno on failure
349 static int wait_resp(struct afu
*afu
, struct afu_cmd
*cmd
)
351 struct cxlflash_cfg
*cfg
= afu
->parent
;
352 struct device
*dev
= &cfg
->dev
->dev
;
354 ulong timeout
= msecs_to_jiffies(cmd
->rcb
.timeout
* 2 * 1000);
356 timeout
= wait_for_completion_timeout(&cmd
->cevent
, timeout
);
360 if (unlikely(cmd
->sa
.ioasc
!= 0)) {
361 dev_err(dev
, "%s: cmd %02x failed, ioasc=%08x\n",
362 __func__
, cmd
->rcb
.cdb
[0], cmd
->sa
.ioasc
);
370 * cmd_to_target_hwq() - selects a target hardware queue for a SCSI command
371 * @host: SCSI host associated with device.
372 * @scp: SCSI command to send.
373 * @afu: SCSI command to send.
375 * Hashes a command based upon the hardware queue mode.
377 * Return: Trusted index of target hardware queue
379 static u32
cmd_to_target_hwq(struct Scsi_Host
*host
, struct scsi_cmnd
*scp
,
385 if (afu
->num_hwqs
== 1)
388 switch (afu
->hwq_mode
) {
390 hwq
= afu
->hwq_rr_count
++ % afu
->num_hwqs
;
393 tag
= blk_mq_unique_tag(scp
->request
);
394 hwq
= blk_mq_unique_tag_to_hwq(tag
);
397 hwq
= smp_processor_id() % afu
->num_hwqs
;
407 * send_tmf() - sends a Task Management Function (TMF)
408 * @afu: AFU to checkout from.
409 * @scp: SCSI command from stack.
410 * @tmfcmd: TMF command to send.
413 * 0 on success, SCSI_MLQUEUE_HOST_BUSY on failure
415 static int send_tmf(struct afu
*afu
, struct scsi_cmnd
*scp
, u64 tmfcmd
)
417 struct Scsi_Host
*host
= scp
->device
->host
;
418 struct cxlflash_cfg
*cfg
= shost_priv(host
);
419 struct afu_cmd
*cmd
= sc_to_afucz(scp
);
420 struct device
*dev
= &cfg
->dev
->dev
;
421 int hwq_index
= cmd_to_target_hwq(host
, scp
, afu
);
422 struct hwq
*hwq
= get_hwq(afu
, hwq_index
);
427 /* When Task Management Function is active do not send another */
428 spin_lock_irqsave(&cfg
->tmf_slock
, lock_flags
);
430 wait_event_interruptible_lock_irq(cfg
->tmf_waitq
,
433 cfg
->tmf_active
= true;
434 spin_unlock_irqrestore(&cfg
->tmf_slock
, lock_flags
);
439 cmd
->hwq_index
= hwq_index
;
441 cmd
->rcb
.ctx_id
= hwq
->ctx_hndl
;
442 cmd
->rcb
.msi
= SISL_MSI_RRQ_UPDATED
;
443 cmd
->rcb
.port_sel
= CHAN2PORTMASK(scp
->device
->channel
);
444 cmd
->rcb
.lun_id
= lun_to_lunid(scp
->device
->lun
);
445 cmd
->rcb
.req_flags
= (SISL_REQ_FLAGS_PORT_LUN_ID
|
446 SISL_REQ_FLAGS_SUP_UNDERRUN
|
447 SISL_REQ_FLAGS_TMF_CMD
);
448 memcpy(cmd
->rcb
.cdb
, &tmfcmd
, sizeof(tmfcmd
));
450 rc
= afu
->send_cmd(afu
, cmd
);
452 spin_lock_irqsave(&cfg
->tmf_slock
, lock_flags
);
453 cfg
->tmf_active
= false;
454 spin_unlock_irqrestore(&cfg
->tmf_slock
, lock_flags
);
458 spin_lock_irqsave(&cfg
->tmf_slock
, lock_flags
);
459 to
= msecs_to_jiffies(5000);
460 to
= wait_event_interruptible_lock_irq_timeout(cfg
->tmf_waitq
,
465 cfg
->tmf_active
= false;
466 dev_err(dev
, "%s: TMF timed out\n", __func__
);
469 spin_unlock_irqrestore(&cfg
->tmf_slock
, lock_flags
);
475 * cxlflash_driver_info() - information handler for this host driver
476 * @host: SCSI host associated with device.
478 * Return: A string describing the device.
480 static const char *cxlflash_driver_info(struct Scsi_Host
*host
)
482 return CXLFLASH_ADAPTER_NAME
;
486 * cxlflash_queuecommand() - sends a mid-layer request
487 * @host: SCSI host associated with device.
488 * @scp: SCSI command to send.
490 * Return: 0 on success, SCSI_MLQUEUE_HOST_BUSY on failure
492 static int cxlflash_queuecommand(struct Scsi_Host
*host
, struct scsi_cmnd
*scp
)
494 struct cxlflash_cfg
*cfg
= shost_priv(host
);
495 struct afu
*afu
= cfg
->afu
;
496 struct device
*dev
= &cfg
->dev
->dev
;
497 struct afu_cmd
*cmd
= sc_to_afucz(scp
);
498 struct scatterlist
*sg
= scsi_sglist(scp
);
499 int hwq_index
= cmd_to_target_hwq(host
, scp
, afu
);
500 struct hwq
*hwq
= get_hwq(afu
, hwq_index
);
501 u16 req_flags
= SISL_REQ_FLAGS_SUP_UNDERRUN
;
505 dev_dbg_ratelimited(dev
, "%s: (scp=%p) %d/%d/%d/%llu "
506 "cdb=(%08x-%08x-%08x-%08x)\n",
507 __func__
, scp
, host
->host_no
, scp
->device
->channel
,
508 scp
->device
->id
, scp
->device
->lun
,
509 get_unaligned_be32(&((u32
*)scp
->cmnd
)[0]),
510 get_unaligned_be32(&((u32
*)scp
->cmnd
)[1]),
511 get_unaligned_be32(&((u32
*)scp
->cmnd
)[2]),
512 get_unaligned_be32(&((u32
*)scp
->cmnd
)[3]));
515 * If a Task Management Function is active, wait for it to complete
516 * before continuing with regular commands.
518 spin_lock_irqsave(&cfg
->tmf_slock
, lock_flags
);
519 if (cfg
->tmf_active
) {
520 spin_unlock_irqrestore(&cfg
->tmf_slock
, lock_flags
);
521 rc
= SCSI_MLQUEUE_HOST_BUSY
;
524 spin_unlock_irqrestore(&cfg
->tmf_slock
, lock_flags
);
526 switch (cfg
->state
) {
530 dev_dbg_ratelimited(dev
, "%s: device is in reset\n", __func__
);
531 rc
= SCSI_MLQUEUE_HOST_BUSY
;
534 dev_dbg_ratelimited(dev
, "%s: device has failed\n", __func__
);
535 scp
->result
= (DID_NO_CONNECT
<< 16);
544 cmd
->rcb
.data_len
= sg
->length
;
545 cmd
->rcb
.data_ea
= (uintptr_t)sg_virt(sg
);
550 cmd
->hwq_index
= hwq_index
;
552 cmd
->rcb
.ctx_id
= hwq
->ctx_hndl
;
553 cmd
->rcb
.msi
= SISL_MSI_RRQ_UPDATED
;
554 cmd
->rcb
.port_sel
= CHAN2PORTMASK(scp
->device
->channel
);
555 cmd
->rcb
.lun_id
= lun_to_lunid(scp
->device
->lun
);
557 if (scp
->sc_data_direction
== DMA_TO_DEVICE
)
558 req_flags
|= SISL_REQ_FLAGS_HOST_WRITE
;
560 cmd
->rcb
.req_flags
= req_flags
;
561 memcpy(cmd
->rcb
.cdb
, scp
->cmnd
, sizeof(cmd
->rcb
.cdb
));
563 rc
= afu
->send_cmd(afu
, cmd
);
569 * cxlflash_wait_for_pci_err_recovery() - wait for error recovery during probe
570 * @cfg: Internal structure associated with the host.
572 static void cxlflash_wait_for_pci_err_recovery(struct cxlflash_cfg
*cfg
)
574 struct pci_dev
*pdev
= cfg
->dev
;
576 if (pci_channel_offline(pdev
))
577 wait_event_timeout(cfg
->reset_waitq
,
578 !pci_channel_offline(pdev
),
579 CXLFLASH_PCI_ERROR_RECOVERY_TIMEOUT
);
583 * free_mem() - free memory associated with the AFU
584 * @cfg: Internal structure associated with the host.
586 static void free_mem(struct cxlflash_cfg
*cfg
)
588 struct afu
*afu
= cfg
->afu
;
591 free_pages((ulong
)afu
, get_order(sizeof(struct afu
)));
597 * cxlflash_reset_sync() - synchronizing point for asynchronous resets
598 * @cfg: Internal structure associated with the host.
600 static void cxlflash_reset_sync(struct cxlflash_cfg
*cfg
)
602 if (cfg
->async_reset_cookie
== 0)
605 /* Wait until all async calls prior to this cookie have completed */
606 async_synchronize_cookie(cfg
->async_reset_cookie
+ 1);
607 cfg
->async_reset_cookie
= 0;
611 * stop_afu() - stops the AFU command timers and unmaps the MMIO space
612 * @cfg: Internal structure associated with the host.
614 * Safe to call with AFU in a partially allocated/initialized state.
616 * Cancels scheduled worker threads, waits for any active internal AFU
617 * commands to timeout, disables IRQ polling and then unmaps the MMIO space.
619 static void stop_afu(struct cxlflash_cfg
*cfg
)
621 struct afu
*afu
= cfg
->afu
;
625 cancel_work_sync(&cfg
->work_q
);
626 if (!current_is_async())
627 cxlflash_reset_sync(cfg
);
630 while (atomic_read(&afu
->cmds_active
))
633 if (afu_is_irqpoll_enabled(afu
)) {
634 for (i
= 0; i
< afu
->num_hwqs
; i
++) {
635 hwq
= get_hwq(afu
, i
);
637 irq_poll_disable(&hwq
->irqpoll
);
641 if (likely(afu
->afu_map
)) {
642 cxl_psa_unmap((void __iomem
*)afu
->afu_map
);
649 * term_intr() - disables all AFU interrupts
650 * @cfg: Internal structure associated with the host.
651 * @level: Depth of allocation, where to begin waterfall tear down.
652 * @index: Index of the hardware queue.
654 * Safe to call with AFU/MC in partially allocated/initialized state.
656 static void term_intr(struct cxlflash_cfg
*cfg
, enum undo_level level
,
659 struct afu
*afu
= cfg
->afu
;
660 struct device
*dev
= &cfg
->dev
->dev
;
664 dev_err(dev
, "%s: returning with NULL afu\n", __func__
);
668 hwq
= get_hwq(afu
, index
);
671 dev_err(dev
, "%s: returning with NULL MC\n", __func__
);
677 /* SISL_MSI_ASYNC_ERROR is setup only for the primary HWQ */
678 if (index
== PRIMARY_HWQ
)
679 cxl_unmap_afu_irq(hwq
->ctx
, 3, hwq
);
681 cxl_unmap_afu_irq(hwq
->ctx
, 2, hwq
);
683 cxl_unmap_afu_irq(hwq
->ctx
, 1, hwq
);
685 cxl_free_afu_irqs(hwq
->ctx
);
688 /* No action required */
694 * term_mc() - terminates the master context
695 * @cfg: Internal structure associated with the host.
696 * @index: Index of the hardware queue.
698 * Safe to call with AFU/MC in partially allocated/initialized state.
700 static void term_mc(struct cxlflash_cfg
*cfg
, u32 index
)
702 struct afu
*afu
= cfg
->afu
;
703 struct device
*dev
= &cfg
->dev
->dev
;
707 dev_err(dev
, "%s: returning with NULL afu\n", __func__
);
711 hwq
= get_hwq(afu
, index
);
714 dev_err(dev
, "%s: returning with NULL MC\n", __func__
);
718 WARN_ON(cxl_stop_context(hwq
->ctx
));
719 if (index
!= PRIMARY_HWQ
)
720 WARN_ON(cxl_release_context(hwq
->ctx
));
725 * term_afu() - terminates the AFU
726 * @cfg: Internal structure associated with the host.
728 * Safe to call with AFU/MC in partially allocated/initialized state.
730 static void term_afu(struct cxlflash_cfg
*cfg
)
732 struct device
*dev
= &cfg
->dev
->dev
;
736 * Tear down is carefully orchestrated to ensure
737 * no interrupts can come in when the problem state
740 * 1) Disable all AFU interrupts for each master
741 * 2) Unmap the problem state area
742 * 3) Stop each master context
744 for (k
= cfg
->afu
->num_hwqs
- 1; k
>= 0; k
--)
745 term_intr(cfg
, UNMAP_THREE
, k
);
750 for (k
= cfg
->afu
->num_hwqs
- 1; k
>= 0; k
--)
753 dev_dbg(dev
, "%s: returning\n", __func__
);
757 * notify_shutdown() - notifies device of pending shutdown
758 * @cfg: Internal structure associated with the host.
759 * @wait: Whether to wait for shutdown processing to complete.
761 * This function will notify the AFU that the adapter is being shutdown
762 * and will wait for shutdown processing to complete if wait is true.
763 * This notification should flush pending I/Os to the device and halt
764 * further I/Os until the next AFU reset is issued and device restarted.
766 static void notify_shutdown(struct cxlflash_cfg
*cfg
, bool wait
)
768 struct afu
*afu
= cfg
->afu
;
769 struct device
*dev
= &cfg
->dev
->dev
;
770 struct dev_dependent_vals
*ddv
;
771 __be64 __iomem
*fc_port_regs
;
773 int i
, retry_cnt
= 0;
775 ddv
= (struct dev_dependent_vals
*)cfg
->dev_id
->driver_data
;
776 if (!(ddv
->flags
& CXLFLASH_NOTIFY_SHUTDOWN
))
779 if (!afu
|| !afu
->afu_map
) {
780 dev_dbg(dev
, "%s: Problem state area not mapped\n", __func__
);
785 for (i
= 0; i
< cfg
->num_fc_ports
; i
++) {
786 fc_port_regs
= get_fc_port_regs(cfg
, i
);
788 reg
= readq_be(&fc_port_regs
[FC_CONFIG2
/ 8]);
789 reg
|= SISL_FC_SHUTDOWN_NORMAL
;
790 writeq_be(reg
, &fc_port_regs
[FC_CONFIG2
/ 8]);
796 /* Wait up to 1.5 seconds for shutdown processing to complete */
797 for (i
= 0; i
< cfg
->num_fc_ports
; i
++) {
798 fc_port_regs
= get_fc_port_regs(cfg
, i
);
802 status
= readq_be(&fc_port_regs
[FC_STATUS
/ 8]);
803 if (status
& SISL_STATUS_SHUTDOWN_COMPLETE
)
805 if (++retry_cnt
>= MC_RETRY_CNT
) {
806 dev_dbg(dev
, "%s: port %d shutdown processing "
807 "not yet completed\n", __func__
, i
);
810 msleep(100 * retry_cnt
);
816 * cxlflash_remove() - PCI entry point to tear down host
817 * @pdev: PCI device associated with the host.
819 * Safe to use as a cleanup in partially allocated/initialized state. Note that
820 * the reset_waitq is flushed as part of the stop/termination of user contexts.
822 static void cxlflash_remove(struct pci_dev
*pdev
)
824 struct cxlflash_cfg
*cfg
= pci_get_drvdata(pdev
);
825 struct device
*dev
= &pdev
->dev
;
828 if (!pci_is_enabled(pdev
)) {
829 dev_dbg(dev
, "%s: Device is disabled\n", __func__
);
833 /* If a Task Management Function is active, wait for it to complete
834 * before continuing with remove.
836 spin_lock_irqsave(&cfg
->tmf_slock
, lock_flags
);
838 wait_event_interruptible_lock_irq(cfg
->tmf_waitq
,
841 spin_unlock_irqrestore(&cfg
->tmf_slock
, lock_flags
);
843 /* Notify AFU and wait for shutdown processing to complete */
844 notify_shutdown(cfg
, true);
846 cfg
->state
= STATE_FAILTERM
;
847 cxlflash_stop_term_user_contexts(cfg
);
849 switch (cfg
->init_state
) {
850 case INIT_STATE_SCSI
:
851 cxlflash_term_local_luns(cfg
);
852 scsi_remove_host(cfg
->host
);
856 pci_disable_device(pdev
);
857 case INIT_STATE_NONE
:
859 scsi_host_put(cfg
->host
);
863 dev_dbg(dev
, "%s: returning\n", __func__
);
867 * alloc_mem() - allocates the AFU and its command pool
868 * @cfg: Internal structure associated with the host.
870 * A partially allocated state remains on failure.
874 * -ENOMEM on failure to allocate memory
876 static int alloc_mem(struct cxlflash_cfg
*cfg
)
879 struct device
*dev
= &cfg
->dev
->dev
;
881 /* AFU is ~28k, i.e. only one 64k page or up to seven 4k pages */
882 cfg
->afu
= (void *)__get_free_pages(GFP_KERNEL
| __GFP_ZERO
,
883 get_order(sizeof(struct afu
)));
884 if (unlikely(!cfg
->afu
)) {
885 dev_err(dev
, "%s: cannot get %d free pages\n",
886 __func__
, get_order(sizeof(struct afu
)));
890 cfg
->afu
->parent
= cfg
;
891 cfg
->afu
->desired_hwqs
= CXLFLASH_DEF_HWQS
;
892 cfg
->afu
->afu_map
= NULL
;
898 * init_pci() - initializes the host as a PCI device
899 * @cfg: Internal structure associated with the host.
901 * Return: 0 on success, -errno on failure
903 static int init_pci(struct cxlflash_cfg
*cfg
)
905 struct pci_dev
*pdev
= cfg
->dev
;
906 struct device
*dev
= &cfg
->dev
->dev
;
909 rc
= pci_enable_device(pdev
);
910 if (rc
|| pci_channel_offline(pdev
)) {
911 if (pci_channel_offline(pdev
)) {
912 cxlflash_wait_for_pci_err_recovery(cfg
);
913 rc
= pci_enable_device(pdev
);
917 dev_err(dev
, "%s: Cannot enable adapter\n", __func__
);
918 cxlflash_wait_for_pci_err_recovery(cfg
);
924 dev_dbg(dev
, "%s: returning rc=%d\n", __func__
, rc
);
929 * init_scsi() - adds the host to the SCSI stack and kicks off host scan
930 * @cfg: Internal structure associated with the host.
932 * Return: 0 on success, -errno on failure
934 static int init_scsi(struct cxlflash_cfg
*cfg
)
936 struct pci_dev
*pdev
= cfg
->dev
;
937 struct device
*dev
= &cfg
->dev
->dev
;
940 rc
= scsi_add_host(cfg
->host
, &pdev
->dev
);
942 dev_err(dev
, "%s: scsi_add_host failed rc=%d\n", __func__
, rc
);
946 scsi_scan_host(cfg
->host
);
949 dev_dbg(dev
, "%s: returning rc=%d\n", __func__
, rc
);
954 * set_port_online() - transitions the specified host FC port to online state
955 * @fc_regs: Top of MMIO region defined for specified port.
957 * The provided MMIO region must be mapped prior to call. Online state means
958 * that the FC link layer has synced, completed the handshaking process, and
959 * is ready for login to start.
961 static void set_port_online(__be64 __iomem
*fc_regs
)
965 cmdcfg
= readq_be(&fc_regs
[FC_MTIP_CMDCONFIG
/ 8]);
966 cmdcfg
&= (~FC_MTIP_CMDCONFIG_OFFLINE
); /* clear OFF_LINE */
967 cmdcfg
|= (FC_MTIP_CMDCONFIG_ONLINE
); /* set ON_LINE */
968 writeq_be(cmdcfg
, &fc_regs
[FC_MTIP_CMDCONFIG
/ 8]);
972 * set_port_offline() - transitions the specified host FC port to offline state
973 * @fc_regs: Top of MMIO region defined for specified port.
975 * The provided MMIO region must be mapped prior to call.
977 static void set_port_offline(__be64 __iomem
*fc_regs
)
981 cmdcfg
= readq_be(&fc_regs
[FC_MTIP_CMDCONFIG
/ 8]);
982 cmdcfg
&= (~FC_MTIP_CMDCONFIG_ONLINE
); /* clear ON_LINE */
983 cmdcfg
|= (FC_MTIP_CMDCONFIG_OFFLINE
); /* set OFF_LINE */
984 writeq_be(cmdcfg
, &fc_regs
[FC_MTIP_CMDCONFIG
/ 8]);
988 * wait_port_online() - waits for the specified host FC port come online
989 * @fc_regs: Top of MMIO region defined for specified port.
990 * @delay_us: Number of microseconds to delay between reading port status.
991 * @nretry: Number of cycles to retry reading port status.
993 * The provided MMIO region must be mapped prior to call. This will timeout
994 * when the cable is not plugged in.
997 * TRUE (1) when the specified port is online
998 * FALSE (0) when the specified port fails to come online after timeout
1000 static bool wait_port_online(__be64 __iomem
*fc_regs
, u32 delay_us
, u32 nretry
)
1004 WARN_ON(delay_us
< 1000);
1007 msleep(delay_us
/ 1000);
1008 status
= readq_be(&fc_regs
[FC_MTIP_STATUS
/ 8]);
1009 if (status
== U64_MAX
)
1011 } while ((status
& FC_MTIP_STATUS_MASK
) != FC_MTIP_STATUS_ONLINE
&&
1014 return ((status
& FC_MTIP_STATUS_MASK
) == FC_MTIP_STATUS_ONLINE
);
1018 * wait_port_offline() - waits for the specified host FC port go offline
1019 * @fc_regs: Top of MMIO region defined for specified port.
1020 * @delay_us: Number of microseconds to delay between reading port status.
1021 * @nretry: Number of cycles to retry reading port status.
1023 * The provided MMIO region must be mapped prior to call.
1026 * TRUE (1) when the specified port is offline
1027 * FALSE (0) when the specified port fails to go offline after timeout
1029 static bool wait_port_offline(__be64 __iomem
*fc_regs
, u32 delay_us
, u32 nretry
)
1033 WARN_ON(delay_us
< 1000);
1036 msleep(delay_us
/ 1000);
1037 status
= readq_be(&fc_regs
[FC_MTIP_STATUS
/ 8]);
1038 if (status
== U64_MAX
)
1040 } while ((status
& FC_MTIP_STATUS_MASK
) != FC_MTIP_STATUS_OFFLINE
&&
1043 return ((status
& FC_MTIP_STATUS_MASK
) == FC_MTIP_STATUS_OFFLINE
);
1047 * afu_set_wwpn() - configures the WWPN for the specified host FC port
1048 * @afu: AFU associated with the host that owns the specified FC port.
1049 * @port: Port number being configured.
1050 * @fc_regs: Top of MMIO region defined for specified port.
1051 * @wwpn: The world-wide-port-number previously discovered for port.
1053 * The provided MMIO region must be mapped prior to call. As part of the
1054 * sequence to configure the WWPN, the port is toggled offline and then back
1055 * online. This toggling action can cause this routine to delay up to a few
1056 * seconds. When configured to use the internal LUN feature of the AFU, a
1057 * failure to come online is overridden.
1059 static void afu_set_wwpn(struct afu
*afu
, int port
, __be64 __iomem
*fc_regs
,
1062 struct cxlflash_cfg
*cfg
= afu
->parent
;
1063 struct device
*dev
= &cfg
->dev
->dev
;
1065 set_port_offline(fc_regs
);
1066 if (!wait_port_offline(fc_regs
, FC_PORT_STATUS_RETRY_INTERVAL_US
,
1067 FC_PORT_STATUS_RETRY_CNT
)) {
1068 dev_dbg(dev
, "%s: wait on port %d to go offline timed out\n",
1072 writeq_be(wwpn
, &fc_regs
[FC_PNAME
/ 8]);
1074 set_port_online(fc_regs
);
1075 if (!wait_port_online(fc_regs
, FC_PORT_STATUS_RETRY_INTERVAL_US
,
1076 FC_PORT_STATUS_RETRY_CNT
)) {
1077 dev_dbg(dev
, "%s: wait on port %d to go online timed out\n",
1083 * afu_link_reset() - resets the specified host FC port
1084 * @afu: AFU associated with the host that owns the specified FC port.
1085 * @port: Port number being configured.
1086 * @fc_regs: Top of MMIO region defined for specified port.
1088 * The provided MMIO region must be mapped prior to call. The sequence to
1089 * reset the port involves toggling it offline and then back online. This
1090 * action can cause this routine to delay up to a few seconds. An effort
1091 * is made to maintain link with the device by switching to host to use
1092 * the alternate port exclusively while the reset takes place.
1093 * failure to come online is overridden.
1095 static void afu_link_reset(struct afu
*afu
, int port
, __be64 __iomem
*fc_regs
)
1097 struct cxlflash_cfg
*cfg
= afu
->parent
;
1098 struct device
*dev
= &cfg
->dev
->dev
;
1101 /* first switch the AFU to the other links, if any */
1102 port_sel
= readq_be(&afu
->afu_map
->global
.regs
.afu_port_sel
);
1103 port_sel
&= ~(1ULL << port
);
1104 writeq_be(port_sel
, &afu
->afu_map
->global
.regs
.afu_port_sel
);
1105 cxlflash_afu_sync(afu
, 0, 0, AFU_GSYNC
);
1107 set_port_offline(fc_regs
);
1108 if (!wait_port_offline(fc_regs
, FC_PORT_STATUS_RETRY_INTERVAL_US
,
1109 FC_PORT_STATUS_RETRY_CNT
))
1110 dev_err(dev
, "%s: wait on port %d to go offline timed out\n",
1113 set_port_online(fc_regs
);
1114 if (!wait_port_online(fc_regs
, FC_PORT_STATUS_RETRY_INTERVAL_US
,
1115 FC_PORT_STATUS_RETRY_CNT
))
1116 dev_err(dev
, "%s: wait on port %d to go online timed out\n",
1119 /* switch back to include this port */
1120 port_sel
|= (1ULL << port
);
1121 writeq_be(port_sel
, &afu
->afu_map
->global
.regs
.afu_port_sel
);
1122 cxlflash_afu_sync(afu
, 0, 0, AFU_GSYNC
);
1124 dev_dbg(dev
, "%s: returning port_sel=%016llx\n", __func__
, port_sel
);
1128 * afu_err_intr_init() - clears and initializes the AFU for error interrupts
1129 * @afu: AFU associated with the host.
1131 static void afu_err_intr_init(struct afu
*afu
)
1133 struct cxlflash_cfg
*cfg
= afu
->parent
;
1134 __be64 __iomem
*fc_port_regs
;
1136 struct hwq
*hwq
= get_hwq(afu
, PRIMARY_HWQ
);
1139 /* global async interrupts: AFU clears afu_ctrl on context exit
1140 * if async interrupts were sent to that context. This prevents
1141 * the AFU form sending further async interrupts when
1143 * nobody to receive them.
1147 writeq_be(-1ULL, &afu
->afu_map
->global
.regs
.aintr_mask
);
1148 /* set LISN# to send and point to primary master context */
1149 reg
= ((u64
) (((hwq
->ctx_hndl
<< 8) | SISL_MSI_ASYNC_ERROR
)) << 40);
1151 if (afu
->internal_lun
)
1152 reg
|= 1; /* Bit 63 indicates local lun */
1153 writeq_be(reg
, &afu
->afu_map
->global
.regs
.afu_ctrl
);
1155 writeq_be(-1ULL, &afu
->afu_map
->global
.regs
.aintr_clear
);
1156 /* unmask bits that are of interest */
1157 /* note: afu can send an interrupt after this step */
1158 writeq_be(SISL_ASTATUS_MASK
, &afu
->afu_map
->global
.regs
.aintr_mask
);
1159 /* clear again in case a bit came on after previous clear but before */
1161 writeq_be(-1ULL, &afu
->afu_map
->global
.regs
.aintr_clear
);
1163 /* Clear/Set internal lun bits */
1164 fc_port_regs
= get_fc_port_regs(cfg
, 0);
1165 reg
= readq_be(&fc_port_regs
[FC_CONFIG2
/ 8]);
1166 reg
&= SISL_FC_INTERNAL_MASK
;
1167 if (afu
->internal_lun
)
1168 reg
|= ((u64
)(afu
->internal_lun
- 1) << SISL_FC_INTERNAL_SHIFT
);
1169 writeq_be(reg
, &fc_port_regs
[FC_CONFIG2
/ 8]);
1171 /* now clear FC errors */
1172 for (i
= 0; i
< cfg
->num_fc_ports
; i
++) {
1173 fc_port_regs
= get_fc_port_regs(cfg
, i
);
1175 writeq_be(0xFFFFFFFFU
, &fc_port_regs
[FC_ERROR
/ 8]);
1176 writeq_be(0, &fc_port_regs
[FC_ERRCAP
/ 8]);
1179 /* sync interrupts for master's IOARRIN write */
1180 /* note that unlike asyncs, there can be no pending sync interrupts */
1181 /* at this time (this is a fresh context and master has not written */
1182 /* IOARRIN yet), so there is nothing to clear. */
1184 /* set LISN#, it is always sent to the context that wrote IOARRIN */
1185 for (i
= 0; i
< afu
->num_hwqs
; i
++) {
1186 hwq
= get_hwq(afu
, i
);
1188 writeq_be(SISL_MSI_SYNC_ERROR
, &hwq
->host_map
->ctx_ctrl
);
1189 writeq_be(SISL_ISTATUS_MASK
, &hwq
->host_map
->intr_mask
);
1194 * cxlflash_sync_err_irq() - interrupt handler for synchronous errors
1195 * @irq: Interrupt number.
1196 * @data: Private data provided at interrupt registration, the AFU.
1198 * Return: Always return IRQ_HANDLED.
1200 static irqreturn_t
cxlflash_sync_err_irq(int irq
, void *data
)
1202 struct hwq
*hwq
= (struct hwq
*)data
;
1203 struct cxlflash_cfg
*cfg
= hwq
->afu
->parent
;
1204 struct device
*dev
= &cfg
->dev
->dev
;
1208 reg
= readq_be(&hwq
->host_map
->intr_status
);
1209 reg_unmasked
= (reg
& SISL_ISTATUS_UNMASK
);
1211 if (reg_unmasked
== 0UL) {
1212 dev_err(dev
, "%s: spurious interrupt, intr_status=%016llx\n",
1214 goto cxlflash_sync_err_irq_exit
;
1217 dev_err(dev
, "%s: unexpected interrupt, intr_status=%016llx\n",
1220 writeq_be(reg_unmasked
, &hwq
->host_map
->intr_clear
);
1222 cxlflash_sync_err_irq_exit
:
1227 * process_hrrq() - process the read-response queue
1228 * @afu: AFU associated with the host.
1229 * @doneq: Queue of commands harvested from the RRQ.
1230 * @budget: Threshold of RRQ entries to process.
1232 * This routine must be called holding the disabled RRQ spin lock.
1234 * Return: The number of entries processed.
1236 static int process_hrrq(struct hwq
*hwq
, struct list_head
*doneq
, int budget
)
1238 struct afu
*afu
= hwq
->afu
;
1239 struct afu_cmd
*cmd
;
1240 struct sisl_ioasa
*ioasa
;
1241 struct sisl_ioarcb
*ioarcb
;
1242 bool toggle
= hwq
->toggle
;
1245 *hrrq_start
= hwq
->hrrq_start
,
1246 *hrrq_end
= hwq
->hrrq_end
,
1247 *hrrq_curr
= hwq
->hrrq_curr
;
1249 /* Process ready RRQ entries up to the specified budget (if any) */
1253 if ((entry
& SISL_RESP_HANDLE_T_BIT
) != toggle
)
1256 entry
&= ~SISL_RESP_HANDLE_T_BIT
;
1258 if (afu_is_sq_cmd_mode(afu
)) {
1259 ioasa
= (struct sisl_ioasa
*)entry
;
1260 cmd
= container_of(ioasa
, struct afu_cmd
, sa
);
1262 ioarcb
= (struct sisl_ioarcb
*)entry
;
1263 cmd
= container_of(ioarcb
, struct afu_cmd
, rcb
);
1266 list_add_tail(&cmd
->queue
, doneq
);
1268 /* Advance to next entry or wrap and flip the toggle bit */
1269 if (hrrq_curr
< hrrq_end
)
1272 hrrq_curr
= hrrq_start
;
1273 toggle
^= SISL_RESP_HANDLE_T_BIT
;
1276 atomic_inc(&hwq
->hsq_credits
);
1279 if (budget
> 0 && num_hrrq
>= budget
)
1283 hwq
->hrrq_curr
= hrrq_curr
;
1284 hwq
->toggle
= toggle
;
1290 * process_cmd_doneq() - process a queue of harvested RRQ commands
1291 * @doneq: Queue of completed commands.
1293 * Note that upon return the queue can no longer be trusted.
1295 static void process_cmd_doneq(struct list_head
*doneq
)
1297 struct afu_cmd
*cmd
, *tmp
;
1299 WARN_ON(list_empty(doneq
));
1301 list_for_each_entry_safe(cmd
, tmp
, doneq
, queue
)
1306 * cxlflash_irqpoll() - process a queue of harvested RRQ commands
1307 * @irqpoll: IRQ poll structure associated with queue to poll.
1308 * @budget: Threshold of RRQ entries to process per poll.
1310 * Return: The number of entries processed.
1312 static int cxlflash_irqpoll(struct irq_poll
*irqpoll
, int budget
)
1314 struct hwq
*hwq
= container_of(irqpoll
, struct hwq
, irqpoll
);
1315 unsigned long hrrq_flags
;
1317 int num_entries
= 0;
1319 spin_lock_irqsave(&hwq
->hrrq_slock
, hrrq_flags
);
1321 num_entries
= process_hrrq(hwq
, &doneq
, budget
);
1322 if (num_entries
< budget
)
1323 irq_poll_complete(irqpoll
);
1325 spin_unlock_irqrestore(&hwq
->hrrq_slock
, hrrq_flags
);
1327 process_cmd_doneq(&doneq
);
1332 * cxlflash_rrq_irq() - interrupt handler for read-response queue (normal path)
1333 * @irq: Interrupt number.
1334 * @data: Private data provided at interrupt registration, the AFU.
1336 * Return: IRQ_HANDLED or IRQ_NONE when no ready entries found.
1338 static irqreturn_t
cxlflash_rrq_irq(int irq
, void *data
)
1340 struct hwq
*hwq
= (struct hwq
*)data
;
1341 struct afu
*afu
= hwq
->afu
;
1342 unsigned long hrrq_flags
;
1344 int num_entries
= 0;
1346 spin_lock_irqsave(&hwq
->hrrq_slock
, hrrq_flags
);
1348 if (afu_is_irqpoll_enabled(afu
)) {
1349 irq_poll_sched(&hwq
->irqpoll
);
1350 spin_unlock_irqrestore(&hwq
->hrrq_slock
, hrrq_flags
);
1354 num_entries
= process_hrrq(hwq
, &doneq
, -1);
1355 spin_unlock_irqrestore(&hwq
->hrrq_slock
, hrrq_flags
);
1357 if (num_entries
== 0)
1360 process_cmd_doneq(&doneq
);
1365 * Asynchronous interrupt information table
1368 * - Order matters here as this array is indexed by bit position.
1370 * - The checkpatch script considers the BUILD_SISL_ASTATUS_FC_PORT macro
1371 * as complex and complains due to a lack of parentheses/braces.
1373 #define ASTATUS_FC(_a, _b, _c, _d) \
1374 { SISL_ASTATUS_FC##_a##_##_b, _c, _a, (_d) }
1376 #define BUILD_SISL_ASTATUS_FC_PORT(_a) \
1377 ASTATUS_FC(_a, LINK_UP, "link up", 0), \
1378 ASTATUS_FC(_a, LINK_DN, "link down", 0), \
1379 ASTATUS_FC(_a, LOGI_S, "login succeeded", SCAN_HOST), \
1380 ASTATUS_FC(_a, LOGI_F, "login failed", CLR_FC_ERROR), \
1381 ASTATUS_FC(_a, LOGI_R, "login timed out, retrying", LINK_RESET), \
1382 ASTATUS_FC(_a, CRC_T, "CRC threshold exceeded", LINK_RESET), \
1383 ASTATUS_FC(_a, LOGO, "target initiated LOGO", 0), \
1384 ASTATUS_FC(_a, OTHER, "other error", CLR_FC_ERROR | LINK_RESET)
1386 static const struct asyc_intr_info ainfo
[] = {
1387 BUILD_SISL_ASTATUS_FC_PORT(1),
1388 BUILD_SISL_ASTATUS_FC_PORT(0),
1389 BUILD_SISL_ASTATUS_FC_PORT(3),
1390 BUILD_SISL_ASTATUS_FC_PORT(2)
1394 * cxlflash_async_err_irq() - interrupt handler for asynchronous errors
1395 * @irq: Interrupt number.
1396 * @data: Private data provided at interrupt registration, the AFU.
1398 * Return: Always return IRQ_HANDLED.
1400 static irqreturn_t
cxlflash_async_err_irq(int irq
, void *data
)
1402 struct hwq
*hwq
= (struct hwq
*)data
;
1403 struct afu
*afu
= hwq
->afu
;
1404 struct cxlflash_cfg
*cfg
= afu
->parent
;
1405 struct device
*dev
= &cfg
->dev
->dev
;
1406 const struct asyc_intr_info
*info
;
1407 struct sisl_global_map __iomem
*global
= &afu
->afu_map
->global
;
1408 __be64 __iomem
*fc_port_regs
;
1414 reg
= readq_be(&global
->regs
.aintr_status
);
1415 reg_unmasked
= (reg
& SISL_ASTATUS_UNMASK
);
1417 if (unlikely(reg_unmasked
== 0)) {
1418 dev_err(dev
, "%s: spurious interrupt, aintr_status=%016llx\n",
1423 /* FYI, it is 'okay' to clear AFU status before FC_ERROR */
1424 writeq_be(reg_unmasked
, &global
->regs
.aintr_clear
);
1426 /* Check each bit that is on */
1427 for_each_set_bit(bit
, (ulong
*)®_unmasked
, BITS_PER_LONG
) {
1428 if (unlikely(bit
>= ARRAY_SIZE(ainfo
))) {
1434 if (unlikely(info
->status
!= 1ULL << bit
)) {
1440 fc_port_regs
= get_fc_port_regs(cfg
, port
);
1442 dev_err(dev
, "%s: FC Port %d -> %s, fc_status=%016llx\n",
1443 __func__
, port
, info
->desc
,
1444 readq_be(&fc_port_regs
[FC_STATUS
/ 8]));
1447 * Do link reset first, some OTHER errors will set FC_ERROR
1448 * again if cleared before or w/o a reset
1450 if (info
->action
& LINK_RESET
) {
1451 dev_err(dev
, "%s: FC Port %d: resetting link\n",
1453 cfg
->lr_state
= LINK_RESET_REQUIRED
;
1454 cfg
->lr_port
= port
;
1455 schedule_work(&cfg
->work_q
);
1458 if (info
->action
& CLR_FC_ERROR
) {
1459 reg
= readq_be(&fc_port_regs
[FC_ERROR
/ 8]);
1462 * Since all errors are unmasked, FC_ERROR and FC_ERRCAP
1463 * should be the same and tracing one is sufficient.
1466 dev_err(dev
, "%s: fc %d: clearing fc_error=%016llx\n",
1467 __func__
, port
, reg
);
1469 writeq_be(reg
, &fc_port_regs
[FC_ERROR
/ 8]);
1470 writeq_be(0, &fc_port_regs
[FC_ERRCAP
/ 8]);
1473 if (info
->action
& SCAN_HOST
) {
1474 atomic_inc(&cfg
->scan_host_needed
);
1475 schedule_work(&cfg
->work_q
);
1484 * start_context() - starts the master context
1485 * @cfg: Internal structure associated with the host.
1486 * @index: Index of the hardware queue.
1488 * Return: A success or failure value from CXL services.
1490 static int start_context(struct cxlflash_cfg
*cfg
, u32 index
)
1492 struct device
*dev
= &cfg
->dev
->dev
;
1493 struct hwq
*hwq
= get_hwq(cfg
->afu
, index
);
1496 rc
= cxl_start_context(hwq
->ctx
,
1497 hwq
->work
.work_element_descriptor
,
1500 dev_dbg(dev
, "%s: returning rc=%d\n", __func__
, rc
);
1505 * read_vpd() - obtains the WWPNs from VPD
1506 * @cfg: Internal structure associated with the host.
1507 * @wwpn: Array of size MAX_FC_PORTS to pass back WWPNs
1509 * Return: 0 on success, -errno on failure
1511 static int read_vpd(struct cxlflash_cfg
*cfg
, u64 wwpn
[])
1513 struct device
*dev
= &cfg
->dev
->dev
;
1514 struct pci_dev
*pdev
= cfg
->dev
;
1516 int ro_start
, ro_size
, i
, j
, k
;
1518 char vpd_data
[CXLFLASH_VPD_LEN
];
1519 char tmp_buf
[WWPN_BUF_LEN
] = { 0 };
1520 char *wwpn_vpd_tags
[MAX_FC_PORTS
] = { "V5", "V6", "V7", "V8" };
1522 /* Get the VPD data from the device */
1523 vpd_size
= cxl_read_adapter_vpd(pdev
, vpd_data
, sizeof(vpd_data
));
1524 if (unlikely(vpd_size
<= 0)) {
1525 dev_err(dev
, "%s: Unable to read VPD (size = %ld)\n",
1526 __func__
, vpd_size
);
1531 /* Get the read only section offset */
1532 ro_start
= pci_vpd_find_tag(vpd_data
, 0, vpd_size
,
1533 PCI_VPD_LRDT_RO_DATA
);
1534 if (unlikely(ro_start
< 0)) {
1535 dev_err(dev
, "%s: VPD Read-only data not found\n", __func__
);
1540 /* Get the read only section size, cap when extends beyond read VPD */
1541 ro_size
= pci_vpd_lrdt_size(&vpd_data
[ro_start
]);
1543 i
= ro_start
+ PCI_VPD_LRDT_TAG_SIZE
;
1544 if (unlikely((i
+ j
) > vpd_size
)) {
1545 dev_dbg(dev
, "%s: Might need to read more VPD (%d > %ld)\n",
1546 __func__
, (i
+ j
), vpd_size
);
1547 ro_size
= vpd_size
- i
;
1551 * Find the offset of the WWPN tag within the read only
1552 * VPD data and validate the found field (partials are
1553 * no good to us). Convert the ASCII data to an integer
1554 * value. Note that we must copy to a temporary buffer
1555 * because the conversion service requires that the ASCII
1556 * string be terminated.
1558 for (k
= 0; k
< cfg
->num_fc_ports
; k
++) {
1560 i
= ro_start
+ PCI_VPD_LRDT_TAG_SIZE
;
1562 i
= pci_vpd_find_info_keyword(vpd_data
, i
, j
, wwpn_vpd_tags
[k
]);
1563 if (unlikely(i
< 0)) {
1564 dev_err(dev
, "%s: Port %d WWPN not found in VPD\n",
1570 j
= pci_vpd_info_field_size(&vpd_data
[i
]);
1571 i
+= PCI_VPD_INFO_FLD_HDR_SIZE
;
1572 if (unlikely((i
+ j
> vpd_size
) || (j
!= WWPN_LEN
))) {
1573 dev_err(dev
, "%s: Port %d WWPN incomplete or bad VPD\n",
1579 memcpy(tmp_buf
, &vpd_data
[i
], WWPN_LEN
);
1580 rc
= kstrtoul(tmp_buf
, WWPN_LEN
, (ulong
*)&wwpn
[k
]);
1582 dev_err(dev
, "%s: WWPN conversion failed for port %d\n",
1588 dev_dbg(dev
, "%s: wwpn%d=%016llx\n", __func__
, k
, wwpn
[k
]);
1592 dev_dbg(dev
, "%s: returning rc=%d\n", __func__
, rc
);
1597 * init_pcr() - initialize the provisioning and control registers
1598 * @cfg: Internal structure associated with the host.
1600 * Also sets up fast access to the mapped registers and initializes AFU
1601 * command fields that never change.
1603 static void init_pcr(struct cxlflash_cfg
*cfg
)
1605 struct afu
*afu
= cfg
->afu
;
1606 struct sisl_ctrl_map __iomem
*ctrl_map
;
1610 for (i
= 0; i
< MAX_CONTEXT
; i
++) {
1611 ctrl_map
= &afu
->afu_map
->ctrls
[i
].ctrl
;
1612 /* Disrupt any clients that could be running */
1613 /* e.g. clients that survived a master restart */
1614 writeq_be(0, &ctrl_map
->rht_start
);
1615 writeq_be(0, &ctrl_map
->rht_cnt_id
);
1616 writeq_be(0, &ctrl_map
->ctx_cap
);
1619 /* Copy frequently used fields into hwq */
1620 for (i
= 0; i
< afu
->num_hwqs
; i
++) {
1621 hwq
= get_hwq(afu
, i
);
1623 hwq
->ctx_hndl
= (u16
) cxl_process_element(hwq
->ctx
);
1624 hwq
->host_map
= &afu
->afu_map
->hosts
[hwq
->ctx_hndl
].host
;
1625 hwq
->ctrl_map
= &afu
->afu_map
->ctrls
[hwq
->ctx_hndl
].ctrl
;
1627 /* Program the Endian Control for the master context */
1628 writeq_be(SISL_ENDIAN_CTRL
, &hwq
->host_map
->endian_ctrl
);
1633 * init_global() - initialize AFU global registers
1634 * @cfg: Internal structure associated with the host.
1636 static int init_global(struct cxlflash_cfg
*cfg
)
1638 struct afu
*afu
= cfg
->afu
;
1639 struct device
*dev
= &cfg
->dev
->dev
;
1641 struct sisl_host_map __iomem
*hmap
;
1642 __be64 __iomem
*fc_port_regs
;
1643 u64 wwpn
[MAX_FC_PORTS
]; /* wwpn of AFU ports */
1644 int i
= 0, num_ports
= 0;
1648 rc
= read_vpd(cfg
, &wwpn
[0]);
1650 dev_err(dev
, "%s: could not read vpd rc=%d\n", __func__
, rc
);
1654 /* Set up RRQ and SQ in HWQ for master issued cmds */
1655 for (i
= 0; i
< afu
->num_hwqs
; i
++) {
1656 hwq
= get_hwq(afu
, i
);
1657 hmap
= hwq
->host_map
;
1659 writeq_be((u64
) hwq
->hrrq_start
, &hmap
->rrq_start
);
1660 writeq_be((u64
) hwq
->hrrq_end
, &hmap
->rrq_end
);
1662 if (afu_is_sq_cmd_mode(afu
)) {
1663 writeq_be((u64
)hwq
->hsq_start
, &hmap
->sq_start
);
1664 writeq_be((u64
)hwq
->hsq_end
, &hmap
->sq_end
);
1668 /* AFU configuration */
1669 reg
= readq_be(&afu
->afu_map
->global
.regs
.afu_config
);
1670 reg
|= SISL_AFUCONF_AR_ALL
|SISL_AFUCONF_ENDIAN
;
1671 /* enable all auto retry options and control endianness */
1672 /* leave others at default: */
1673 /* CTX_CAP write protected, mbox_r does not clear on read and */
1674 /* checker on if dual afu */
1675 writeq_be(reg
, &afu
->afu_map
->global
.regs
.afu_config
);
1677 /* Global port select: select either port */
1678 if (afu
->internal_lun
) {
1679 /* Only use port 0 */
1680 writeq_be(PORT0
, &afu
->afu_map
->global
.regs
.afu_port_sel
);
1683 writeq_be(PORT_MASK(cfg
->num_fc_ports
),
1684 &afu
->afu_map
->global
.regs
.afu_port_sel
);
1685 num_ports
= cfg
->num_fc_ports
;
1688 for (i
= 0; i
< num_ports
; i
++) {
1689 fc_port_regs
= get_fc_port_regs(cfg
, i
);
1691 /* Unmask all errors (but they are still masked at AFU) */
1692 writeq_be(0, &fc_port_regs
[FC_ERRMSK
/ 8]);
1693 /* Clear CRC error cnt & set a threshold */
1694 (void)readq_be(&fc_port_regs
[FC_CNT_CRCERR
/ 8]);
1695 writeq_be(MC_CRC_THRESH
, &fc_port_regs
[FC_CRC_THRESH
/ 8]);
1697 /* Set WWPNs. If already programmed, wwpn[i] is 0 */
1699 afu_set_wwpn(afu
, i
, &fc_port_regs
[0], wwpn
[i
]);
1700 /* Programming WWPN back to back causes additional
1701 * offline/online transitions and a PLOGI
1706 /* Set up master's own CTX_CAP to allow real mode, host translation */
1707 /* tables, afu cmds and read/write GSCSI cmds. */
1708 /* First, unlock ctx_cap write by reading mbox */
1709 for (i
= 0; i
< afu
->num_hwqs
; i
++) {
1710 hwq
= get_hwq(afu
, i
);
1712 (void)readq_be(&hwq
->ctrl_map
->mbox_r
); /* unlock ctx_cap */
1713 writeq_be((SISL_CTX_CAP_REAL_MODE
| SISL_CTX_CAP_HOST_XLATE
|
1714 SISL_CTX_CAP_READ_CMD
| SISL_CTX_CAP_WRITE_CMD
|
1715 SISL_CTX_CAP_AFU_CMD
| SISL_CTX_CAP_GSCSI_CMD
),
1716 &hwq
->ctrl_map
->ctx_cap
);
1718 /* Initialize heartbeat */
1719 afu
->hb
= readq_be(&afu
->afu_map
->global
.regs
.afu_hb
);
1725 * start_afu() - initializes and starts the AFU
1726 * @cfg: Internal structure associated with the host.
1728 static int start_afu(struct cxlflash_cfg
*cfg
)
1730 struct afu
*afu
= cfg
->afu
;
1731 struct device
*dev
= &cfg
->dev
->dev
;
1738 /* Initialize each HWQ */
1739 for (i
= 0; i
< afu
->num_hwqs
; i
++) {
1740 hwq
= get_hwq(afu
, i
);
1742 /* After an AFU reset, RRQ entries are stale, clear them */
1743 memset(&hwq
->rrq_entry
, 0, sizeof(hwq
->rrq_entry
));
1745 /* Initialize RRQ pointers */
1746 hwq
->hrrq_start
= &hwq
->rrq_entry
[0];
1747 hwq
->hrrq_end
= &hwq
->rrq_entry
[NUM_RRQ_ENTRY
- 1];
1748 hwq
->hrrq_curr
= hwq
->hrrq_start
;
1751 /* Initialize spin locks */
1752 spin_lock_init(&hwq
->hrrq_slock
);
1753 spin_lock_init(&hwq
->hsq_slock
);
1756 if (afu_is_sq_cmd_mode(afu
)) {
1757 memset(&hwq
->sq
, 0, sizeof(hwq
->sq
));
1758 hwq
->hsq_start
= &hwq
->sq
[0];
1759 hwq
->hsq_end
= &hwq
->sq
[NUM_SQ_ENTRY
- 1];
1760 hwq
->hsq_curr
= hwq
->hsq_start
;
1762 atomic_set(&hwq
->hsq_credits
, NUM_SQ_ENTRY
- 1);
1765 /* Initialize IRQ poll */
1766 if (afu_is_irqpoll_enabled(afu
))
1767 irq_poll_init(&hwq
->irqpoll
, afu
->irqpoll_weight
,
1772 rc
= init_global(cfg
);
1774 dev_dbg(dev
, "%s: returning rc=%d\n", __func__
, rc
);
1779 * init_intr() - setup interrupt handlers for the master context
1780 * @cfg: Internal structure associated with the host.
1781 * @hwq: Hardware queue to initialize.
1783 * Return: 0 on success, -errno on failure
1785 static enum undo_level
init_intr(struct cxlflash_cfg
*cfg
,
1788 struct device
*dev
= &cfg
->dev
->dev
;
1789 struct cxl_context
*ctx
= hwq
->ctx
;
1791 enum undo_level level
= UNDO_NOOP
;
1792 bool is_primary_hwq
= (hwq
->index
== PRIMARY_HWQ
);
1793 int num_irqs
= is_primary_hwq
? 3 : 2;
1795 rc
= cxl_allocate_afu_irqs(ctx
, num_irqs
);
1797 dev_err(dev
, "%s: allocate_afu_irqs failed rc=%d\n",
1803 rc
= cxl_map_afu_irq(ctx
, 1, cxlflash_sync_err_irq
, hwq
,
1804 "SISL_MSI_SYNC_ERROR");
1805 if (unlikely(rc
<= 0)) {
1806 dev_err(dev
, "%s: SISL_MSI_SYNC_ERROR map failed\n", __func__
);
1811 rc
= cxl_map_afu_irq(ctx
, 2, cxlflash_rrq_irq
, hwq
,
1812 "SISL_MSI_RRQ_UPDATED");
1813 if (unlikely(rc
<= 0)) {
1814 dev_err(dev
, "%s: SISL_MSI_RRQ_UPDATED map failed\n", __func__
);
1819 /* SISL_MSI_ASYNC_ERROR is setup only for the primary HWQ */
1820 if (!is_primary_hwq
)
1823 rc
= cxl_map_afu_irq(ctx
, 3, cxlflash_async_err_irq
, hwq
,
1824 "SISL_MSI_ASYNC_ERROR");
1825 if (unlikely(rc
<= 0)) {
1826 dev_err(dev
, "%s: SISL_MSI_ASYNC_ERROR map failed\n", __func__
);
1835 * init_mc() - create and register as the master context
1836 * @cfg: Internal structure associated with the host.
1837 * index: HWQ Index of the master context.
1839 * Return: 0 on success, -errno on failure
1841 static int init_mc(struct cxlflash_cfg
*cfg
, u32 index
)
1843 struct cxl_context
*ctx
;
1844 struct device
*dev
= &cfg
->dev
->dev
;
1845 struct hwq
*hwq
= get_hwq(cfg
->afu
, index
);
1847 enum undo_level level
;
1849 hwq
->afu
= cfg
->afu
;
1851 INIT_LIST_HEAD(&hwq
->pending_cmds
);
1853 if (index
== PRIMARY_HWQ
)
1854 ctx
= cxl_get_context(cfg
->dev
);
1856 ctx
= cxl_dev_context_init(cfg
->dev
);
1857 if (unlikely(!ctx
)) {
1865 /* Set it up as a master with the CXL */
1866 cxl_set_master(ctx
);
1868 /* Reset AFU when initializing primary context */
1869 if (index
== PRIMARY_HWQ
) {
1870 rc
= cxl_afu_reset(ctx
);
1872 dev_err(dev
, "%s: AFU reset failed rc=%d\n",
1878 level
= init_intr(cfg
, hwq
);
1879 if (unlikely(level
)) {
1880 dev_err(dev
, "%s: interrupt init failed rc=%d\n", __func__
, rc
);
1884 /* This performs the equivalent of the CXL_IOCTL_START_WORK.
1885 * The CXL_IOCTL_GET_PROCESS_ELEMENT is implicit in the process
1886 * element (pe) that is embedded in the context (ctx)
1888 rc
= start_context(cfg
, index
);
1890 dev_err(dev
, "%s: start context failed rc=%d\n", __func__
, rc
);
1891 level
= UNMAP_THREE
;
1896 dev_dbg(dev
, "%s: returning rc=%d\n", __func__
, rc
);
1899 term_intr(cfg
, level
, index
);
1900 if (index
!= PRIMARY_HWQ
)
1901 cxl_release_context(ctx
);
1908 * get_num_afu_ports() - determines and configures the number of AFU ports
1909 * @cfg: Internal structure associated with the host.
1911 * This routine determines the number of AFU ports by converting the global
1912 * port selection mask. The converted value is only valid following an AFU
1913 * reset (explicit or power-on). This routine must be invoked shortly after
1914 * mapping as other routines are dependent on the number of ports during the
1915 * initialization sequence.
1917 * To support legacy AFUs that might not have reflected an initial global
1918 * port mask (value read is 0), default to the number of ports originally
1919 * supported by the cxlflash driver (2) before hardware with other port
1920 * offerings was introduced.
1922 static void get_num_afu_ports(struct cxlflash_cfg
*cfg
)
1924 struct afu
*afu
= cfg
->afu
;
1925 struct device
*dev
= &cfg
->dev
->dev
;
1927 int num_fc_ports
= LEGACY_FC_PORTS
;
1929 port_mask
= readq_be(&afu
->afu_map
->global
.regs
.afu_port_sel
);
1930 if (port_mask
!= 0ULL)
1931 num_fc_ports
= min(ilog2(port_mask
) + 1, MAX_FC_PORTS
);
1933 dev_dbg(dev
, "%s: port_mask=%016llx num_fc_ports=%d\n",
1934 __func__
, port_mask
, num_fc_ports
);
1936 cfg
->num_fc_ports
= num_fc_ports
;
1937 cfg
->host
->max_channel
= PORTNUM2CHAN(num_fc_ports
);
1941 * init_afu() - setup as master context and start AFU
1942 * @cfg: Internal structure associated with the host.
1944 * This routine is a higher level of control for configuring the
1945 * AFU on probe and reset paths.
1947 * Return: 0 on success, -errno on failure
1949 static int init_afu(struct cxlflash_cfg
*cfg
)
1953 struct afu
*afu
= cfg
->afu
;
1954 struct device
*dev
= &cfg
->dev
->dev
;
1958 cxl_perst_reloads_same_image(cfg
->cxl_afu
, true);
1960 afu
->num_hwqs
= afu
->desired_hwqs
;
1961 for (i
= 0; i
< afu
->num_hwqs
; i
++) {
1962 rc
= init_mc(cfg
, i
);
1964 dev_err(dev
, "%s: init_mc failed rc=%d index=%d\n",
1970 /* Map the entire MMIO space of the AFU using the first context */
1971 hwq
= get_hwq(afu
, PRIMARY_HWQ
);
1972 afu
->afu_map
= cxl_psa_map(hwq
->ctx
);
1973 if (!afu
->afu_map
) {
1974 dev_err(dev
, "%s: cxl_psa_map failed\n", __func__
);
1979 /* No byte reverse on reading afu_version or string will be backwards */
1980 reg
= readq(&afu
->afu_map
->global
.regs
.afu_version
);
1981 memcpy(afu
->version
, ®
, sizeof(reg
));
1982 afu
->interface_version
=
1983 readq_be(&afu
->afu_map
->global
.regs
.interface_version
);
1984 if ((afu
->interface_version
+ 1) == 0) {
1985 dev_err(dev
, "Back level AFU, please upgrade. AFU version %s "
1986 "interface version %016llx\n", afu
->version
,
1987 afu
->interface_version
);
1992 if (afu_is_sq_cmd_mode(afu
)) {
1993 afu
->send_cmd
= send_cmd_sq
;
1994 afu
->context_reset
= context_reset_sq
;
1996 afu
->send_cmd
= send_cmd_ioarrin
;
1997 afu
->context_reset
= context_reset_ioarrin
;
2000 dev_dbg(dev
, "%s: afu_ver=%s interface_ver=%016llx\n", __func__
,
2001 afu
->version
, afu
->interface_version
);
2003 get_num_afu_ports(cfg
);
2005 rc
= start_afu(cfg
);
2007 dev_err(dev
, "%s: start_afu failed, rc=%d\n", __func__
, rc
);
2011 afu_err_intr_init(cfg
->afu
);
2012 for (i
= 0; i
< afu
->num_hwqs
; i
++) {
2013 hwq
= get_hwq(afu
, i
);
2015 hwq
->room
= readq_be(&hwq
->host_map
->cmd_room
);
2018 /* Restore the LUN mappings */
2019 cxlflash_restore_luntable(cfg
);
2021 dev_dbg(dev
, "%s: returning rc=%d\n", __func__
, rc
);
2025 for (i
= afu
->num_hwqs
- 1; i
>= 0; i
--) {
2026 term_intr(cfg
, UNMAP_THREE
, i
);
2033 * afu_reset() - resets the AFU
2034 * @cfg: Internal structure associated with the host.
2036 * Return: 0 on success, -errno on failure
2038 static int afu_reset(struct cxlflash_cfg
*cfg
)
2040 struct device
*dev
= &cfg
->dev
->dev
;
2043 /* Stop the context before the reset. Since the context is
2044 * no longer available restart it after the reset is complete
2050 dev_dbg(dev
, "%s: returning rc=%d\n", __func__
, rc
);
2055 * drain_ioctls() - wait until all currently executing ioctls have completed
2056 * @cfg: Internal structure associated with the host.
2058 * Obtain write access to read/write semaphore that wraps ioctl
2059 * handling to 'drain' ioctls currently executing.
2061 static void drain_ioctls(struct cxlflash_cfg
*cfg
)
2063 down_write(&cfg
->ioctl_rwsem
);
2064 up_write(&cfg
->ioctl_rwsem
);
2068 * cxlflash_async_reset_host() - asynchronous host reset handler
2069 * @data: Private data provided while scheduling reset.
2070 * @cookie: Cookie that can be used for checkpointing.
2072 static void cxlflash_async_reset_host(void *data
, async_cookie_t cookie
)
2074 struct cxlflash_cfg
*cfg
= data
;
2075 struct device
*dev
= &cfg
->dev
->dev
;
2078 if (cfg
->state
!= STATE_RESET
) {
2079 dev_dbg(dev
, "%s: Not performing a reset, state=%d\n",
2080 __func__
, cfg
->state
);
2085 cxlflash_mark_contexts_error(cfg
);
2086 rc
= afu_reset(cfg
);
2088 cfg
->state
= STATE_FAILTERM
;
2090 cfg
->state
= STATE_NORMAL
;
2091 wake_up_all(&cfg
->reset_waitq
);
2094 scsi_unblock_requests(cfg
->host
);
2098 * cxlflash_schedule_async_reset() - schedule an asynchronous host reset
2099 * @cfg: Internal structure associated with the host.
2101 static void cxlflash_schedule_async_reset(struct cxlflash_cfg
*cfg
)
2103 struct device
*dev
= &cfg
->dev
->dev
;
2105 if (cfg
->state
!= STATE_NORMAL
) {
2106 dev_dbg(dev
, "%s: Not performing reset state=%d\n",
2107 __func__
, cfg
->state
);
2111 cfg
->state
= STATE_RESET
;
2112 scsi_block_requests(cfg
->host
);
2113 cfg
->async_reset_cookie
= async_schedule(cxlflash_async_reset_host
,
2118 * cxlflash_afu_sync() - builds and sends an AFU sync command
2119 * @afu: AFU associated with the host.
2120 * @ctx_hndl_u: Identifies context requesting sync.
2121 * @res_hndl_u: Identifies resource requesting sync.
2122 * @mode: Type of sync to issue (lightweight, heavyweight, global).
2124 * The AFU can only take 1 sync command at a time. This routine enforces this
2125 * limitation by using a mutex to provide exclusive access to the AFU during
2126 * the sync. This design point requires calling threads to not be on interrupt
2127 * context due to the possibility of sleeping during concurrent sync operations.
2129 * AFU sync operations are only necessary and allowed when the device is
2130 * operating normally. When not operating normally, sync requests can occur as
2131 * part of cleaning up resources associated with an adapter prior to removal.
2132 * In this scenario, these requests are simply ignored (safe due to the AFU
2136 * 0 on success, -errno on failure
2138 int cxlflash_afu_sync(struct afu
*afu
, ctx_hndl_t ctx_hndl_u
,
2139 res_hndl_t res_hndl_u
, u8 mode
)
2141 struct cxlflash_cfg
*cfg
= afu
->parent
;
2142 struct device
*dev
= &cfg
->dev
->dev
;
2143 struct afu_cmd
*cmd
= NULL
;
2144 struct hwq
*hwq
= get_hwq(afu
, PRIMARY_HWQ
);
2148 static DEFINE_MUTEX(sync_active
);
2150 if (cfg
->state
!= STATE_NORMAL
) {
2151 dev_dbg(dev
, "%s: Sync not required state=%u\n",
2152 __func__
, cfg
->state
);
2156 mutex_lock(&sync_active
);
2157 atomic_inc(&afu
->cmds_active
);
2158 buf
= kzalloc(sizeof(*cmd
) + __alignof__(*cmd
) - 1, GFP_KERNEL
);
2159 if (unlikely(!buf
)) {
2160 dev_err(dev
, "%s: no memory for command\n", __func__
);
2165 cmd
= (struct afu_cmd
*)PTR_ALIGN(buf
, __alignof__(*cmd
));
2168 init_completion(&cmd
->cevent
);
2170 cmd
->hwq_index
= hwq
->index
;
2172 dev_dbg(dev
, "%s: afu=%p cmd=%p ctx=%d nretry=%d\n",
2173 __func__
, afu
, cmd
, ctx_hndl_u
, nretry
);
2175 cmd
->rcb
.req_flags
= SISL_REQ_FLAGS_AFU_CMD
;
2176 cmd
->rcb
.ctx_id
= hwq
->ctx_hndl
;
2177 cmd
->rcb
.msi
= SISL_MSI_RRQ_UPDATED
;
2178 cmd
->rcb
.timeout
= MC_AFU_SYNC_TIMEOUT
;
2180 cmd
->rcb
.cdb
[0] = 0xC0; /* AFU Sync */
2181 cmd
->rcb
.cdb
[1] = mode
;
2183 /* The cdb is aligned, no unaligned accessors required */
2184 *((__be16
*)&cmd
->rcb
.cdb
[2]) = cpu_to_be16(ctx_hndl_u
);
2185 *((__be32
*)&cmd
->rcb
.cdb
[4]) = cpu_to_be32(res_hndl_u
);
2187 rc
= afu
->send_cmd(afu
, cmd
);
2193 rc
= wait_resp(afu
, cmd
);
2194 if (rc
== -ETIMEDOUT
) {
2195 rc
= afu
->context_reset(hwq
);
2196 if (!rc
&& ++nretry
< 2)
2198 cxlflash_schedule_async_reset(cfg
);
2202 atomic_dec(&afu
->cmds_active
);
2203 mutex_unlock(&sync_active
);
2205 dev_dbg(dev
, "%s: returning rc=%d\n", __func__
, rc
);
2210 * cxlflash_eh_device_reset_handler() - reset a single LUN
2211 * @scp: SCSI command to send.
2214 * SUCCESS as defined in scsi/scsi.h
2215 * FAILED as defined in scsi/scsi.h
2217 static int cxlflash_eh_device_reset_handler(struct scsi_cmnd
*scp
)
2220 struct Scsi_Host
*host
= scp
->device
->host
;
2221 struct cxlflash_cfg
*cfg
= shost_priv(host
);
2222 struct device
*dev
= &cfg
->dev
->dev
;
2223 struct afu
*afu
= cfg
->afu
;
2226 dev_dbg(dev
, "%s: (scp=%p) %d/%d/%d/%llu "
2227 "cdb=(%08x-%08x-%08x-%08x)\n", __func__
, scp
, host
->host_no
,
2228 scp
->device
->channel
, scp
->device
->id
, scp
->device
->lun
,
2229 get_unaligned_be32(&((u32
*)scp
->cmnd
)[0]),
2230 get_unaligned_be32(&((u32
*)scp
->cmnd
)[1]),
2231 get_unaligned_be32(&((u32
*)scp
->cmnd
)[2]),
2232 get_unaligned_be32(&((u32
*)scp
->cmnd
)[3]));
2235 switch (cfg
->state
) {
2237 rcr
= send_tmf(afu
, scp
, TMF_LUN_RESET
);
2242 wait_event(cfg
->reset_waitq
, cfg
->state
!= STATE_RESET
);
2249 dev_dbg(dev
, "%s: returning rc=%d\n", __func__
, rc
);
2254 * cxlflash_eh_host_reset_handler() - reset the host adapter
2255 * @scp: SCSI command from stack identifying host.
2257 * Following a reset, the state is evaluated again in case an EEH occurred
2258 * during the reset. In such a scenario, the host reset will either yield
2259 * until the EEH recovery is complete or return success or failure based
2260 * upon the current device state.
2263 * SUCCESS as defined in scsi/scsi.h
2264 * FAILED as defined in scsi/scsi.h
2266 static int cxlflash_eh_host_reset_handler(struct scsi_cmnd
*scp
)
2270 struct Scsi_Host
*host
= scp
->device
->host
;
2271 struct cxlflash_cfg
*cfg
= shost_priv(host
);
2272 struct device
*dev
= &cfg
->dev
->dev
;
2274 dev_dbg(dev
, "%s: (scp=%p) %d/%d/%d/%llu "
2275 "cdb=(%08x-%08x-%08x-%08x)\n", __func__
, scp
, host
->host_no
,
2276 scp
->device
->channel
, scp
->device
->id
, scp
->device
->lun
,
2277 get_unaligned_be32(&((u32
*)scp
->cmnd
)[0]),
2278 get_unaligned_be32(&((u32
*)scp
->cmnd
)[1]),
2279 get_unaligned_be32(&((u32
*)scp
->cmnd
)[2]),
2280 get_unaligned_be32(&((u32
*)scp
->cmnd
)[3]));
2282 switch (cfg
->state
) {
2284 cfg
->state
= STATE_RESET
;
2286 cxlflash_mark_contexts_error(cfg
);
2287 rcr
= afu_reset(cfg
);
2290 cfg
->state
= STATE_FAILTERM
;
2292 cfg
->state
= STATE_NORMAL
;
2293 wake_up_all(&cfg
->reset_waitq
);
2297 wait_event(cfg
->reset_waitq
, cfg
->state
!= STATE_RESET
);
2298 if (cfg
->state
== STATE_NORMAL
)
2306 dev_dbg(dev
, "%s: returning rc=%d\n", __func__
, rc
);
2311 * cxlflash_change_queue_depth() - change the queue depth for the device
2312 * @sdev: SCSI device destined for queue depth change.
2313 * @qdepth: Requested queue depth value to set.
2315 * The requested queue depth is capped to the maximum supported value.
2317 * Return: The actual queue depth set.
2319 static int cxlflash_change_queue_depth(struct scsi_device
*sdev
, int qdepth
)
2322 if (qdepth
> CXLFLASH_MAX_CMDS_PER_LUN
)
2323 qdepth
= CXLFLASH_MAX_CMDS_PER_LUN
;
2325 scsi_change_queue_depth(sdev
, qdepth
);
2326 return sdev
->queue_depth
;
2330 * cxlflash_show_port_status() - queries and presents the current port status
2331 * @port: Desired port for status reporting.
2332 * @cfg: Internal structure associated with the host.
2333 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
2335 * Return: The size of the ASCII string returned in @buf or -EINVAL.
2337 static ssize_t
cxlflash_show_port_status(u32 port
,
2338 struct cxlflash_cfg
*cfg
,
2341 struct device
*dev
= &cfg
->dev
->dev
;
2344 __be64 __iomem
*fc_port_regs
;
2346 WARN_ON(port
>= MAX_FC_PORTS
);
2348 if (port
>= cfg
->num_fc_ports
) {
2349 dev_info(dev
, "%s: Port %d not supported on this card.\n",
2354 fc_port_regs
= get_fc_port_regs(cfg
, port
);
2355 status
= readq_be(&fc_port_regs
[FC_MTIP_STATUS
/ 8]);
2356 status
&= FC_MTIP_STATUS_MASK
;
2358 if (status
== FC_MTIP_STATUS_ONLINE
)
2359 disp_status
= "online";
2360 else if (status
== FC_MTIP_STATUS_OFFLINE
)
2361 disp_status
= "offline";
2363 disp_status
= "unknown";
2365 return scnprintf(buf
, PAGE_SIZE
, "%s\n", disp_status
);
2369 * port0_show() - queries and presents the current status of port 0
2370 * @dev: Generic device associated with the host owning the port.
2371 * @attr: Device attribute representing the port.
2372 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
2374 * Return: The size of the ASCII string returned in @buf.
2376 static ssize_t
port0_show(struct device
*dev
,
2377 struct device_attribute
*attr
,
2380 struct cxlflash_cfg
*cfg
= shost_priv(class_to_shost(dev
));
2382 return cxlflash_show_port_status(0, cfg
, buf
);
2386 * port1_show() - queries and presents the current status of port 1
2387 * @dev: Generic device associated with the host owning the port.
2388 * @attr: Device attribute representing the port.
2389 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
2391 * Return: The size of the ASCII string returned in @buf.
2393 static ssize_t
port1_show(struct device
*dev
,
2394 struct device_attribute
*attr
,
2397 struct cxlflash_cfg
*cfg
= shost_priv(class_to_shost(dev
));
2399 return cxlflash_show_port_status(1, cfg
, buf
);
2403 * port2_show() - queries and presents the current status of port 2
2404 * @dev: Generic device associated with the host owning the port.
2405 * @attr: Device attribute representing the port.
2406 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
2408 * Return: The size of the ASCII string returned in @buf.
2410 static ssize_t
port2_show(struct device
*dev
,
2411 struct device_attribute
*attr
,
2414 struct cxlflash_cfg
*cfg
= shost_priv(class_to_shost(dev
));
2416 return cxlflash_show_port_status(2, cfg
, buf
);
2420 * port3_show() - queries and presents the current status of port 3
2421 * @dev: Generic device associated with the host owning the port.
2422 * @attr: Device attribute representing the port.
2423 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
2425 * Return: The size of the ASCII string returned in @buf.
2427 static ssize_t
port3_show(struct device
*dev
,
2428 struct device_attribute
*attr
,
2431 struct cxlflash_cfg
*cfg
= shost_priv(class_to_shost(dev
));
2433 return cxlflash_show_port_status(3, cfg
, buf
);
2437 * lun_mode_show() - presents the current LUN mode of the host
2438 * @dev: Generic device associated with the host.
2439 * @attr: Device attribute representing the LUN mode.
2440 * @buf: Buffer of length PAGE_SIZE to report back the LUN mode in ASCII.
2442 * Return: The size of the ASCII string returned in @buf.
2444 static ssize_t
lun_mode_show(struct device
*dev
,
2445 struct device_attribute
*attr
, char *buf
)
2447 struct cxlflash_cfg
*cfg
= shost_priv(class_to_shost(dev
));
2448 struct afu
*afu
= cfg
->afu
;
2450 return scnprintf(buf
, PAGE_SIZE
, "%u\n", afu
->internal_lun
);
2454 * lun_mode_store() - sets the LUN mode of the host
2455 * @dev: Generic device associated with the host.
2456 * @attr: Device attribute representing the LUN mode.
2457 * @buf: Buffer of length PAGE_SIZE containing the LUN mode in ASCII.
2458 * @count: Length of data resizing in @buf.
2460 * The CXL Flash AFU supports a dummy LUN mode where the external
2461 * links and storage are not required. Space on the FPGA is used
2462 * to create 1 or 2 small LUNs which are presented to the system
2463 * as if they were a normal storage device. This feature is useful
2464 * during development and also provides manufacturing with a way
2465 * to test the AFU without an actual device.
2467 * 0 = external LUN[s] (default)
2468 * 1 = internal LUN (1 x 64K, 512B blocks, id 0)
2469 * 2 = internal LUN (1 x 64K, 4K blocks, id 0)
2470 * 3 = internal LUN (2 x 32K, 512B blocks, ids 0,1)
2471 * 4 = internal LUN (2 x 32K, 4K blocks, ids 0,1)
2473 * Return: The size of the ASCII string returned in @buf.
2475 static ssize_t
lun_mode_store(struct device
*dev
,
2476 struct device_attribute
*attr
,
2477 const char *buf
, size_t count
)
2479 struct Scsi_Host
*shost
= class_to_shost(dev
);
2480 struct cxlflash_cfg
*cfg
= shost_priv(shost
);
2481 struct afu
*afu
= cfg
->afu
;
2485 rc
= kstrtouint(buf
, 10, &lun_mode
);
2486 if (!rc
&& (lun_mode
< 5) && (lun_mode
!= afu
->internal_lun
)) {
2487 afu
->internal_lun
= lun_mode
;
2490 * When configured for internal LUN, there is only one channel,
2491 * channel number 0, else there will be one less than the number
2492 * of fc ports for this card.
2494 if (afu
->internal_lun
)
2495 shost
->max_channel
= 0;
2497 shost
->max_channel
= PORTNUM2CHAN(cfg
->num_fc_ports
);
2500 scsi_scan_host(cfg
->host
);
2507 * ioctl_version_show() - presents the current ioctl version of the host
2508 * @dev: Generic device associated with the host.
2509 * @attr: Device attribute representing the ioctl version.
2510 * @buf: Buffer of length PAGE_SIZE to report back the ioctl version.
2512 * Return: The size of the ASCII string returned in @buf.
2514 static ssize_t
ioctl_version_show(struct device
*dev
,
2515 struct device_attribute
*attr
, char *buf
)
2517 return scnprintf(buf
, PAGE_SIZE
, "%u\n", DK_CXLFLASH_VERSION_0
);
2521 * cxlflash_show_port_lun_table() - queries and presents the port LUN table
2522 * @port: Desired port for status reporting.
2523 * @cfg: Internal structure associated with the host.
2524 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
2526 * Return: The size of the ASCII string returned in @buf or -EINVAL.
2528 static ssize_t
cxlflash_show_port_lun_table(u32 port
,
2529 struct cxlflash_cfg
*cfg
,
2532 struct device
*dev
= &cfg
->dev
->dev
;
2533 __be64 __iomem
*fc_port_luns
;
2537 WARN_ON(port
>= MAX_FC_PORTS
);
2539 if (port
>= cfg
->num_fc_ports
) {
2540 dev_info(dev
, "%s: Port %d not supported on this card.\n",
2545 fc_port_luns
= get_fc_port_luns(cfg
, port
);
2547 for (i
= 0; i
< CXLFLASH_NUM_VLUNS
; i
++)
2548 bytes
+= scnprintf(buf
+ bytes
, PAGE_SIZE
- bytes
,
2550 i
, readq_be(&fc_port_luns
[i
]));
2555 * port0_lun_table_show() - presents the current LUN table of port 0
2556 * @dev: Generic device associated with the host owning the port.
2557 * @attr: Device attribute representing the port.
2558 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
2560 * Return: The size of the ASCII string returned in @buf.
2562 static ssize_t
port0_lun_table_show(struct device
*dev
,
2563 struct device_attribute
*attr
,
2566 struct cxlflash_cfg
*cfg
= shost_priv(class_to_shost(dev
));
2568 return cxlflash_show_port_lun_table(0, cfg
, buf
);
2572 * port1_lun_table_show() - presents the current LUN table of port 1
2573 * @dev: Generic device associated with the host owning the port.
2574 * @attr: Device attribute representing the port.
2575 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
2577 * Return: The size of the ASCII string returned in @buf.
2579 static ssize_t
port1_lun_table_show(struct device
*dev
,
2580 struct device_attribute
*attr
,
2583 struct cxlflash_cfg
*cfg
= shost_priv(class_to_shost(dev
));
2585 return cxlflash_show_port_lun_table(1, cfg
, buf
);
2589 * port2_lun_table_show() - presents the current LUN table of port 2
2590 * @dev: Generic device associated with the host owning the port.
2591 * @attr: Device attribute representing the port.
2592 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
2594 * Return: The size of the ASCII string returned in @buf.
2596 static ssize_t
port2_lun_table_show(struct device
*dev
,
2597 struct device_attribute
*attr
,
2600 struct cxlflash_cfg
*cfg
= shost_priv(class_to_shost(dev
));
2602 return cxlflash_show_port_lun_table(2, cfg
, buf
);
2606 * port3_lun_table_show() - presents the current LUN table of port 3
2607 * @dev: Generic device associated with the host owning the port.
2608 * @attr: Device attribute representing the port.
2609 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
2611 * Return: The size of the ASCII string returned in @buf.
2613 static ssize_t
port3_lun_table_show(struct device
*dev
,
2614 struct device_attribute
*attr
,
2617 struct cxlflash_cfg
*cfg
= shost_priv(class_to_shost(dev
));
2619 return cxlflash_show_port_lun_table(3, cfg
, buf
);
2623 * irqpoll_weight_show() - presents the current IRQ poll weight for the host
2624 * @dev: Generic device associated with the host.
2625 * @attr: Device attribute representing the IRQ poll weight.
2626 * @buf: Buffer of length PAGE_SIZE to report back the current IRQ poll
2629 * An IRQ poll weight of 0 indicates polling is disabled.
2631 * Return: The size of the ASCII string returned in @buf.
2633 static ssize_t
irqpoll_weight_show(struct device
*dev
,
2634 struct device_attribute
*attr
, char *buf
)
2636 struct cxlflash_cfg
*cfg
= shost_priv(class_to_shost(dev
));
2637 struct afu
*afu
= cfg
->afu
;
2639 return scnprintf(buf
, PAGE_SIZE
, "%u\n", afu
->irqpoll_weight
);
2643 * irqpoll_weight_store() - sets the current IRQ poll weight for the host
2644 * @dev: Generic device associated with the host.
2645 * @attr: Device attribute representing the IRQ poll weight.
2646 * @buf: Buffer of length PAGE_SIZE containing the desired IRQ poll
2648 * @count: Length of data resizing in @buf.
2650 * An IRQ poll weight of 0 indicates polling is disabled.
2652 * Return: The size of the ASCII string returned in @buf.
2654 static ssize_t
irqpoll_weight_store(struct device
*dev
,
2655 struct device_attribute
*attr
,
2656 const char *buf
, size_t count
)
2658 struct cxlflash_cfg
*cfg
= shost_priv(class_to_shost(dev
));
2659 struct device
*cfgdev
= &cfg
->dev
->dev
;
2660 struct afu
*afu
= cfg
->afu
;
2665 rc
= kstrtouint(buf
, 10, &weight
);
2671 "Invalid IRQ poll weight. It must be 256 or less.\n");
2675 if (weight
== afu
->irqpoll_weight
) {
2677 "Current IRQ poll weight has the same weight.\n");
2681 if (afu_is_irqpoll_enabled(afu
)) {
2682 for (i
= 0; i
< afu
->num_hwqs
; i
++) {
2683 hwq
= get_hwq(afu
, i
);
2685 irq_poll_disable(&hwq
->irqpoll
);
2689 afu
->irqpoll_weight
= weight
;
2692 for (i
= 0; i
< afu
->num_hwqs
; i
++) {
2693 hwq
= get_hwq(afu
, i
);
2695 irq_poll_init(&hwq
->irqpoll
, weight
, cxlflash_irqpoll
);
2703 * num_hwqs_show() - presents the number of hardware queues for the host
2704 * @dev: Generic device associated with the host.
2705 * @attr: Device attribute representing the number of hardware queues.
2706 * @buf: Buffer of length PAGE_SIZE to report back the number of hardware
2709 * Return: The size of the ASCII string returned in @buf.
2711 static ssize_t
num_hwqs_show(struct device
*dev
,
2712 struct device_attribute
*attr
, char *buf
)
2714 struct cxlflash_cfg
*cfg
= shost_priv(class_to_shost(dev
));
2715 struct afu
*afu
= cfg
->afu
;
2717 return scnprintf(buf
, PAGE_SIZE
, "%u\n", afu
->num_hwqs
);
2721 * num_hwqs_store() - sets the number of hardware queues for the host
2722 * @dev: Generic device associated with the host.
2723 * @attr: Device attribute representing the number of hardware queues.
2724 * @buf: Buffer of length PAGE_SIZE containing the number of hardware
2726 * @count: Length of data resizing in @buf.
2728 * n > 0: num_hwqs = n
2729 * n = 0: num_hwqs = num_online_cpus()
2730 * n < 0: num_online_cpus() / abs(n)
2732 * Return: The size of the ASCII string returned in @buf.
2734 static ssize_t
num_hwqs_store(struct device
*dev
,
2735 struct device_attribute
*attr
,
2736 const char *buf
, size_t count
)
2738 struct cxlflash_cfg
*cfg
= shost_priv(class_to_shost(dev
));
2739 struct afu
*afu
= cfg
->afu
;
2741 int nhwqs
, num_hwqs
;
2743 rc
= kstrtoint(buf
, 10, &nhwqs
);
2749 else if (nhwqs
== 0)
2750 num_hwqs
= num_online_cpus();
2752 num_hwqs
= num_online_cpus() / abs(nhwqs
);
2754 afu
->desired_hwqs
= min(num_hwqs
, CXLFLASH_MAX_HWQS
);
2755 WARN_ON_ONCE(afu
->desired_hwqs
== 0);
2758 switch (cfg
->state
) {
2760 cfg
->state
= STATE_RESET
;
2762 cxlflash_mark_contexts_error(cfg
);
2763 rc
= afu_reset(cfg
);
2765 cfg
->state
= STATE_FAILTERM
;
2767 cfg
->state
= STATE_NORMAL
;
2768 wake_up_all(&cfg
->reset_waitq
);
2771 wait_event(cfg
->reset_waitq
, cfg
->state
!= STATE_RESET
);
2772 if (cfg
->state
== STATE_NORMAL
)
2775 /* Ideally should not happen */
2776 dev_err(dev
, "%s: Device is not ready, state=%d\n",
2777 __func__
, cfg
->state
);
2784 static const char *hwq_mode_name
[MAX_HWQ_MODE
] = { "rr", "tag", "cpu" };
2787 * hwq_mode_show() - presents the HWQ steering mode for the host
2788 * @dev: Generic device associated with the host.
2789 * @attr: Device attribute representing the HWQ steering mode.
2790 * @buf: Buffer of length PAGE_SIZE to report back the HWQ steering mode
2791 * as a character string.
2793 * Return: The size of the ASCII string returned in @buf.
2795 static ssize_t
hwq_mode_show(struct device
*dev
,
2796 struct device_attribute
*attr
, char *buf
)
2798 struct cxlflash_cfg
*cfg
= shost_priv(class_to_shost(dev
));
2799 struct afu
*afu
= cfg
->afu
;
2801 return scnprintf(buf
, PAGE_SIZE
, "%s\n", hwq_mode_name
[afu
->hwq_mode
]);
2805 * hwq_mode_store() - sets the HWQ steering mode for the host
2806 * @dev: Generic device associated with the host.
2807 * @attr: Device attribute representing the HWQ steering mode.
2808 * @buf: Buffer of length PAGE_SIZE containing the HWQ steering mode
2809 * as a character string.
2810 * @count: Length of data resizing in @buf.
2813 * tag = Block MQ Tagging
2814 * cpu = CPU Affinity
2816 * Return: The size of the ASCII string returned in @buf.
2818 static ssize_t
hwq_mode_store(struct device
*dev
,
2819 struct device_attribute
*attr
,
2820 const char *buf
, size_t count
)
2822 struct Scsi_Host
*shost
= class_to_shost(dev
);
2823 struct cxlflash_cfg
*cfg
= shost_priv(shost
);
2824 struct device
*cfgdev
= &cfg
->dev
->dev
;
2825 struct afu
*afu
= cfg
->afu
;
2827 u32 mode
= MAX_HWQ_MODE
;
2829 for (i
= 0; i
< MAX_HWQ_MODE
; i
++) {
2830 if (!strncmp(hwq_mode_name
[i
], buf
, strlen(hwq_mode_name
[i
]))) {
2836 if (mode
>= MAX_HWQ_MODE
) {
2837 dev_info(cfgdev
, "Invalid HWQ steering mode.\n");
2841 if ((mode
== HWQ_MODE_TAG
) && !shost_use_blk_mq(shost
)) {
2842 dev_info(cfgdev
, "SCSI-MQ is not enabled, use a different "
2843 "HWQ steering mode.\n");
2847 afu
->hwq_mode
= mode
;
2853 * mode_show() - presents the current mode of the device
2854 * @dev: Generic device associated with the device.
2855 * @attr: Device attribute representing the device mode.
2856 * @buf: Buffer of length PAGE_SIZE to report back the dev mode in ASCII.
2858 * Return: The size of the ASCII string returned in @buf.
2860 static ssize_t
mode_show(struct device
*dev
,
2861 struct device_attribute
*attr
, char *buf
)
2863 struct scsi_device
*sdev
= to_scsi_device(dev
);
2865 return scnprintf(buf
, PAGE_SIZE
, "%s\n",
2866 sdev
->hostdata
? "superpipe" : "legacy");
2872 static DEVICE_ATTR_RO(port0
);
2873 static DEVICE_ATTR_RO(port1
);
2874 static DEVICE_ATTR_RO(port2
);
2875 static DEVICE_ATTR_RO(port3
);
2876 static DEVICE_ATTR_RW(lun_mode
);
2877 static DEVICE_ATTR_RO(ioctl_version
);
2878 static DEVICE_ATTR_RO(port0_lun_table
);
2879 static DEVICE_ATTR_RO(port1_lun_table
);
2880 static DEVICE_ATTR_RO(port2_lun_table
);
2881 static DEVICE_ATTR_RO(port3_lun_table
);
2882 static DEVICE_ATTR_RW(irqpoll_weight
);
2883 static DEVICE_ATTR_RW(num_hwqs
);
2884 static DEVICE_ATTR_RW(hwq_mode
);
2886 static struct device_attribute
*cxlflash_host_attrs
[] = {
2892 &dev_attr_ioctl_version
,
2893 &dev_attr_port0_lun_table
,
2894 &dev_attr_port1_lun_table
,
2895 &dev_attr_port2_lun_table
,
2896 &dev_attr_port3_lun_table
,
2897 &dev_attr_irqpoll_weight
,
2906 static DEVICE_ATTR_RO(mode
);
2908 static struct device_attribute
*cxlflash_dev_attrs
[] = {
2916 static struct scsi_host_template driver_template
= {
2917 .module
= THIS_MODULE
,
2918 .name
= CXLFLASH_ADAPTER_NAME
,
2919 .info
= cxlflash_driver_info
,
2920 .ioctl
= cxlflash_ioctl
,
2921 .proc_name
= CXLFLASH_NAME
,
2922 .queuecommand
= cxlflash_queuecommand
,
2923 .eh_device_reset_handler
= cxlflash_eh_device_reset_handler
,
2924 .eh_host_reset_handler
= cxlflash_eh_host_reset_handler
,
2925 .change_queue_depth
= cxlflash_change_queue_depth
,
2926 .cmd_per_lun
= CXLFLASH_MAX_CMDS_PER_LUN
,
2927 .can_queue
= CXLFLASH_MAX_CMDS
,
2928 .cmd_size
= sizeof(struct afu_cmd
) + __alignof__(struct afu_cmd
) - 1,
2930 .sg_tablesize
= 1, /* No scatter gather support */
2931 .max_sectors
= CXLFLASH_MAX_SECTORS
,
2932 .use_clustering
= ENABLE_CLUSTERING
,
2933 .shost_attrs
= cxlflash_host_attrs
,
2934 .sdev_attrs
= cxlflash_dev_attrs
,
2938 * Device dependent values
2940 static struct dev_dependent_vals dev_corsa_vals
= { CXLFLASH_MAX_SECTORS
,
2942 static struct dev_dependent_vals dev_flash_gt_vals
= { CXLFLASH_MAX_SECTORS
,
2943 CXLFLASH_NOTIFY_SHUTDOWN
};
2944 static struct dev_dependent_vals dev_briard_vals
= { CXLFLASH_MAX_SECTORS
,
2945 CXLFLASH_NOTIFY_SHUTDOWN
};
2948 * PCI device binding table
2950 static struct pci_device_id cxlflash_pci_table
[] = {
2951 {PCI_VENDOR_ID_IBM
, PCI_DEVICE_ID_IBM_CORSA
,
2952 PCI_ANY_ID
, PCI_ANY_ID
, 0, 0, (kernel_ulong_t
)&dev_corsa_vals
},
2953 {PCI_VENDOR_ID_IBM
, PCI_DEVICE_ID_IBM_FLASH_GT
,
2954 PCI_ANY_ID
, PCI_ANY_ID
, 0, 0, (kernel_ulong_t
)&dev_flash_gt_vals
},
2955 {PCI_VENDOR_ID_IBM
, PCI_DEVICE_ID_IBM_BRIARD
,
2956 PCI_ANY_ID
, PCI_ANY_ID
, 0, 0, (kernel_ulong_t
)&dev_briard_vals
},
2960 MODULE_DEVICE_TABLE(pci
, cxlflash_pci_table
);
2963 * cxlflash_worker_thread() - work thread handler for the AFU
2964 * @work: Work structure contained within cxlflash associated with host.
2966 * Handles the following events:
2967 * - Link reset which cannot be performed on interrupt context due to
2968 * blocking up to a few seconds
2971 static void cxlflash_worker_thread(struct work_struct
*work
)
2973 struct cxlflash_cfg
*cfg
= container_of(work
, struct cxlflash_cfg
,
2975 struct afu
*afu
= cfg
->afu
;
2976 struct device
*dev
= &cfg
->dev
->dev
;
2977 __be64 __iomem
*fc_port_regs
;
2981 /* Avoid MMIO if the device has failed */
2983 if (cfg
->state
!= STATE_NORMAL
)
2986 spin_lock_irqsave(cfg
->host
->host_lock
, lock_flags
);
2988 if (cfg
->lr_state
== LINK_RESET_REQUIRED
) {
2989 port
= cfg
->lr_port
;
2991 dev_err(dev
, "%s: invalid port index %d\n",
2994 spin_unlock_irqrestore(cfg
->host
->host_lock
,
2997 /* The reset can block... */
2998 fc_port_regs
= get_fc_port_regs(cfg
, port
);
2999 afu_link_reset(afu
, port
, fc_port_regs
);
3000 spin_lock_irqsave(cfg
->host
->host_lock
, lock_flags
);
3003 cfg
->lr_state
= LINK_RESET_COMPLETE
;
3006 spin_unlock_irqrestore(cfg
->host
->host_lock
, lock_flags
);
3008 if (atomic_dec_if_positive(&cfg
->scan_host_needed
) >= 0)
3009 scsi_scan_host(cfg
->host
);
3013 * cxlflash_probe() - PCI entry point to add host
3014 * @pdev: PCI device associated with the host.
3015 * @dev_id: PCI device id associated with device.
3017 * The device will initially start out in a 'probing' state and
3018 * transition to the 'normal' state at the end of a successful
3019 * probe. Should an EEH event occur during probe, the notification
3020 * thread (error_detected()) will wait until the probe handler
3021 * is nearly complete. At that time, the device will be moved to
3022 * a 'probed' state and the EEH thread woken up to drive the slot
3023 * reset and recovery (device moves to 'normal' state). Meanwhile,
3024 * the probe will be allowed to exit successfully.
3026 * Return: 0 on success, -errno on failure
3028 static int cxlflash_probe(struct pci_dev
*pdev
,
3029 const struct pci_device_id
*dev_id
)
3031 struct Scsi_Host
*host
;
3032 struct cxlflash_cfg
*cfg
= NULL
;
3033 struct device
*dev
= &pdev
->dev
;
3034 struct dev_dependent_vals
*ddv
;
3038 dev_dbg(&pdev
->dev
, "%s: Found CXLFLASH with IRQ: %d\n",
3039 __func__
, pdev
->irq
);
3041 ddv
= (struct dev_dependent_vals
*)dev_id
->driver_data
;
3042 driver_template
.max_sectors
= ddv
->max_sectors
;
3044 host
= scsi_host_alloc(&driver_template
, sizeof(struct cxlflash_cfg
));
3046 dev_err(dev
, "%s: scsi_host_alloc failed\n", __func__
);
3051 host
->max_id
= CXLFLASH_MAX_NUM_TARGETS_PER_BUS
;
3052 host
->max_lun
= CXLFLASH_MAX_NUM_LUNS_PER_TARGET
;
3053 host
->unique_id
= host
->host_no
;
3054 host
->max_cmd_len
= CXLFLASH_MAX_CDB_LEN
;
3056 cfg
= shost_priv(host
);
3058 rc
= alloc_mem(cfg
);
3060 dev_err(dev
, "%s: alloc_mem failed\n", __func__
);
3062 scsi_host_put(cfg
->host
);
3066 cfg
->init_state
= INIT_STATE_NONE
;
3068 cfg
->cxl_fops
= cxlflash_cxl_fops
;
3071 * Promoted LUNs move to the top of the LUN table. The rest stay on
3072 * the bottom half. The bottom half grows from the end (index = 255),
3073 * whereas the top half grows from the beginning (index = 0).
3075 * Initialize the last LUN index for all possible ports.
3077 cfg
->promote_lun_index
= 0;
3079 for (k
= 0; k
< MAX_FC_PORTS
; k
++)
3080 cfg
->last_lun_index
[k
] = CXLFLASH_NUM_VLUNS
/2 - 1;
3082 cfg
->dev_id
= (struct pci_device_id
*)dev_id
;
3084 init_waitqueue_head(&cfg
->tmf_waitq
);
3085 init_waitqueue_head(&cfg
->reset_waitq
);
3087 INIT_WORK(&cfg
->work_q
, cxlflash_worker_thread
);
3088 cfg
->lr_state
= LINK_RESET_INVALID
;
3090 spin_lock_init(&cfg
->tmf_slock
);
3091 mutex_init(&cfg
->ctx_tbl_list_mutex
);
3092 mutex_init(&cfg
->ctx_recovery_mutex
);
3093 init_rwsem(&cfg
->ioctl_rwsem
);
3094 INIT_LIST_HEAD(&cfg
->ctx_err_recovery
);
3095 INIT_LIST_HEAD(&cfg
->lluns
);
3097 pci_set_drvdata(pdev
, cfg
);
3099 cfg
->cxl_afu
= cxl_pci_to_afu(pdev
);
3103 dev_err(dev
, "%s: init_pci failed rc=%d\n", __func__
, rc
);
3106 cfg
->init_state
= INIT_STATE_PCI
;
3109 if (rc
&& !wq_has_sleeper(&cfg
->reset_waitq
)) {
3110 dev_err(dev
, "%s: init_afu failed rc=%d\n", __func__
, rc
);
3113 cfg
->init_state
= INIT_STATE_AFU
;
3115 rc
= init_scsi(cfg
);
3117 dev_err(dev
, "%s: init_scsi failed rc=%d\n", __func__
, rc
);
3120 cfg
->init_state
= INIT_STATE_SCSI
;
3122 if (wq_has_sleeper(&cfg
->reset_waitq
)) {
3123 cfg
->state
= STATE_PROBED
;
3124 wake_up_all(&cfg
->reset_waitq
);
3126 cfg
->state
= STATE_NORMAL
;
3128 dev_dbg(dev
, "%s: returning rc=%d\n", __func__
, rc
);
3132 cxlflash_remove(pdev
);
3137 * cxlflash_pci_error_detected() - called when a PCI error is detected
3138 * @pdev: PCI device struct.
3139 * @state: PCI channel state.
3141 * When an EEH occurs during an active reset, wait until the reset is
3142 * complete and then take action based upon the device state.
3144 * Return: PCI_ERS_RESULT_NEED_RESET or PCI_ERS_RESULT_DISCONNECT
3146 static pci_ers_result_t
cxlflash_pci_error_detected(struct pci_dev
*pdev
,
3147 pci_channel_state_t state
)
3150 struct cxlflash_cfg
*cfg
= pci_get_drvdata(pdev
);
3151 struct device
*dev
= &cfg
->dev
->dev
;
3153 dev_dbg(dev
, "%s: pdev=%p state=%u\n", __func__
, pdev
, state
);
3156 case pci_channel_io_frozen
:
3157 wait_event(cfg
->reset_waitq
, cfg
->state
!= STATE_RESET
&&
3158 cfg
->state
!= STATE_PROBING
);
3159 if (cfg
->state
== STATE_FAILTERM
)
3160 return PCI_ERS_RESULT_DISCONNECT
;
3162 cfg
->state
= STATE_RESET
;
3163 scsi_block_requests(cfg
->host
);
3165 rc
= cxlflash_mark_contexts_error(cfg
);
3167 dev_err(dev
, "%s: Failed to mark user contexts rc=%d\n",
3170 return PCI_ERS_RESULT_NEED_RESET
;
3171 case pci_channel_io_perm_failure
:
3172 cfg
->state
= STATE_FAILTERM
;
3173 wake_up_all(&cfg
->reset_waitq
);
3174 scsi_unblock_requests(cfg
->host
);
3175 return PCI_ERS_RESULT_DISCONNECT
;
3179 return PCI_ERS_RESULT_NEED_RESET
;
3183 * cxlflash_pci_slot_reset() - called when PCI slot has been reset
3184 * @pdev: PCI device struct.
3186 * This routine is called by the pci error recovery code after the PCI
3187 * slot has been reset, just before we should resume normal operations.
3189 * Return: PCI_ERS_RESULT_RECOVERED or PCI_ERS_RESULT_DISCONNECT
3191 static pci_ers_result_t
cxlflash_pci_slot_reset(struct pci_dev
*pdev
)
3194 struct cxlflash_cfg
*cfg
= pci_get_drvdata(pdev
);
3195 struct device
*dev
= &cfg
->dev
->dev
;
3197 dev_dbg(dev
, "%s: pdev=%p\n", __func__
, pdev
);
3201 dev_err(dev
, "%s: EEH recovery failed rc=%d\n", __func__
, rc
);
3202 return PCI_ERS_RESULT_DISCONNECT
;
3205 return PCI_ERS_RESULT_RECOVERED
;
3209 * cxlflash_pci_resume() - called when normal operation can resume
3210 * @pdev: PCI device struct
3212 static void cxlflash_pci_resume(struct pci_dev
*pdev
)
3214 struct cxlflash_cfg
*cfg
= pci_get_drvdata(pdev
);
3215 struct device
*dev
= &cfg
->dev
->dev
;
3217 dev_dbg(dev
, "%s: pdev=%p\n", __func__
, pdev
);
3219 cfg
->state
= STATE_NORMAL
;
3220 wake_up_all(&cfg
->reset_waitq
);
3221 scsi_unblock_requests(cfg
->host
);
3224 static const struct pci_error_handlers cxlflash_err_handler
= {
3225 .error_detected
= cxlflash_pci_error_detected
,
3226 .slot_reset
= cxlflash_pci_slot_reset
,
3227 .resume
= cxlflash_pci_resume
,
3231 * PCI device structure
3233 static struct pci_driver cxlflash_driver
= {
3234 .name
= CXLFLASH_NAME
,
3235 .id_table
= cxlflash_pci_table
,
3236 .probe
= cxlflash_probe
,
3237 .remove
= cxlflash_remove
,
3238 .shutdown
= cxlflash_remove
,
3239 .err_handler
= &cxlflash_err_handler
,
3243 * init_cxlflash() - module entry point
3245 * Return: 0 on success, -errno on failure
3247 static int __init
init_cxlflash(void)
3250 cxlflash_list_init();
3252 return pci_register_driver(&cxlflash_driver
);
3256 * exit_cxlflash() - module exit point
3258 static void __exit
exit_cxlflash(void)
3260 cxlflash_term_global_luns();
3261 cxlflash_free_errpage();
3263 pci_unregister_driver(&cxlflash_driver
);
3266 module_init(init_cxlflash
);
3267 module_exit(exit_cxlflash
);