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
;
169 if (unlikely(cmd
->sa
.ioasc
))
170 process_cmd_err(cmd
, scp
);
172 scp
->result
= (DID_OK
<< 16);
174 cmd_is_tmf
= cmd
->cmd_tmf
;
176 dev_dbg_ratelimited(dev
, "%s:scp=%p result=%08x ioasc=%08x\n",
177 __func__
, scp
, scp
->result
, cmd
->sa
.ioasc
);
182 spin_lock_irqsave(&cfg
->tmf_slock
, lock_flags
);
183 cfg
->tmf_active
= false;
184 wake_up_all_locked(&cfg
->tmf_waitq
);
185 spin_unlock_irqrestore(&cfg
->tmf_slock
, lock_flags
);
188 complete(&cmd
->cevent
);
192 * context_reset() - reset context via specified register
193 * @hwq: Hardware queue owning the context to be reset.
194 * @reset_reg: MMIO register to perform reset.
196 * Return: 0 on success, -errno on failure
198 static int context_reset(struct hwq
*hwq
, __be64 __iomem
*reset_reg
)
200 struct cxlflash_cfg
*cfg
= hwq
->afu
->parent
;
201 struct device
*dev
= &cfg
->dev
->dev
;
206 dev_dbg(dev
, "%s: hwq=%p\n", __func__
, hwq
);
208 writeq_be(val
, reset_reg
);
210 val
= readq_be(reset_reg
);
211 if ((val
& 0x1) == 0x0) {
216 /* Double delay each time */
218 } while (nretry
++ < MC_ROOM_RETRY_CNT
);
220 dev_dbg(dev
, "%s: returning rc=%d, val=%016llx nretry=%d\n",
221 __func__
, rc
, val
, nretry
);
226 * context_reset_ioarrin() - reset context via IOARRIN register
227 * @hwq: Hardware queue owning the context to be reset.
229 * Return: 0 on success, -errno on failure
231 static int context_reset_ioarrin(struct hwq
*hwq
)
233 return context_reset(hwq
, &hwq
->host_map
->ioarrin
);
237 * context_reset_sq() - reset context via SQ_CONTEXT_RESET register
238 * @hwq: Hardware queue owning the context to be reset.
240 * Return: 0 on success, -errno on failure
242 static int context_reset_sq(struct hwq
*hwq
)
244 return context_reset(hwq
, &hwq
->host_map
->sq_ctx_reset
);
248 * send_cmd_ioarrin() - sends an AFU command via IOARRIN register
249 * @afu: AFU associated with the host.
250 * @cmd: AFU command to send.
253 * 0 on success, SCSI_MLQUEUE_HOST_BUSY on failure
255 static int send_cmd_ioarrin(struct afu
*afu
, struct afu_cmd
*cmd
)
257 struct cxlflash_cfg
*cfg
= afu
->parent
;
258 struct device
*dev
= &cfg
->dev
->dev
;
259 struct hwq
*hwq
= get_hwq(afu
, cmd
->hwq_index
);
265 * To avoid the performance penalty of MMIO, spread the update of
266 * 'room' over multiple commands.
268 spin_lock_irqsave(&hwq
->hsq_slock
, lock_flags
);
269 if (--hwq
->room
< 0) {
270 room
= readq_be(&hwq
->host_map
->cmd_room
);
272 dev_dbg_ratelimited(dev
, "%s: no cmd_room to send "
273 "0x%02X, room=0x%016llX\n",
274 __func__
, cmd
->rcb
.cdb
[0], room
);
276 rc
= SCSI_MLQUEUE_HOST_BUSY
;
279 hwq
->room
= room
- 1;
282 writeq_be((u64
)&cmd
->rcb
, &hwq
->host_map
->ioarrin
);
284 spin_unlock_irqrestore(&hwq
->hsq_slock
, lock_flags
);
285 dev_dbg(dev
, "%s: cmd=%p len=%u ea=%016llx rc=%d\n", __func__
,
286 cmd
, cmd
->rcb
.data_len
, cmd
->rcb
.data_ea
, rc
);
291 * send_cmd_sq() - sends an AFU command via SQ ring
292 * @afu: AFU associated with the host.
293 * @cmd: AFU command to send.
296 * 0 on success, SCSI_MLQUEUE_HOST_BUSY on failure
298 static int send_cmd_sq(struct afu
*afu
, struct afu_cmd
*cmd
)
300 struct cxlflash_cfg
*cfg
= afu
->parent
;
301 struct device
*dev
= &cfg
->dev
->dev
;
302 struct hwq
*hwq
= get_hwq(afu
, cmd
->hwq_index
);
307 newval
= atomic_dec_if_positive(&hwq
->hsq_credits
);
309 rc
= SCSI_MLQUEUE_HOST_BUSY
;
313 cmd
->rcb
.ioasa
= &cmd
->sa
;
315 spin_lock_irqsave(&hwq
->hsq_slock
, lock_flags
);
317 *hwq
->hsq_curr
= cmd
->rcb
;
318 if (hwq
->hsq_curr
< hwq
->hsq_end
)
321 hwq
->hsq_curr
= hwq
->hsq_start
;
322 writeq_be((u64
)hwq
->hsq_curr
, &hwq
->host_map
->sq_tail
);
324 spin_unlock_irqrestore(&hwq
->hsq_slock
, lock_flags
);
326 dev_dbg(dev
, "%s: cmd=%p len=%u ea=%016llx ioasa=%p rc=%d curr=%p "
327 "head=%016llx tail=%016llx\n", __func__
, cmd
, cmd
->rcb
.data_len
,
328 cmd
->rcb
.data_ea
, cmd
->rcb
.ioasa
, rc
, hwq
->hsq_curr
,
329 readq_be(&hwq
->host_map
->sq_head
),
330 readq_be(&hwq
->host_map
->sq_tail
));
335 * wait_resp() - polls for a response or timeout to a sent AFU command
336 * @afu: AFU associated with the host.
337 * @cmd: AFU command that was sent.
339 * Return: 0 on success, -errno on failure
341 static int wait_resp(struct afu
*afu
, struct afu_cmd
*cmd
)
343 struct cxlflash_cfg
*cfg
= afu
->parent
;
344 struct device
*dev
= &cfg
->dev
->dev
;
346 ulong timeout
= msecs_to_jiffies(cmd
->rcb
.timeout
* 2 * 1000);
348 timeout
= wait_for_completion_timeout(&cmd
->cevent
, timeout
);
352 if (unlikely(cmd
->sa
.ioasc
!= 0)) {
353 dev_err(dev
, "%s: cmd %02x failed, ioasc=%08x\n",
354 __func__
, cmd
->rcb
.cdb
[0], cmd
->sa
.ioasc
);
362 * cmd_to_target_hwq() - selects a target hardware queue for a SCSI command
363 * @host: SCSI host associated with device.
364 * @scp: SCSI command to send.
365 * @afu: SCSI command to send.
367 * Hashes a command based upon the hardware queue mode.
369 * Return: Trusted index of target hardware queue
371 static u32
cmd_to_target_hwq(struct Scsi_Host
*host
, struct scsi_cmnd
*scp
,
377 if (afu
->num_hwqs
== 1)
380 switch (afu
->hwq_mode
) {
382 hwq
= afu
->hwq_rr_count
++ % afu
->num_hwqs
;
385 tag
= blk_mq_unique_tag(scp
->request
);
386 hwq
= blk_mq_unique_tag_to_hwq(tag
);
389 hwq
= smp_processor_id() % afu
->num_hwqs
;
399 * send_tmf() - sends a Task Management Function (TMF)
400 * @afu: AFU to checkout from.
401 * @scp: SCSI command from stack.
402 * @tmfcmd: TMF command to send.
405 * 0 on success, SCSI_MLQUEUE_HOST_BUSY on failure
407 static int send_tmf(struct afu
*afu
, struct scsi_cmnd
*scp
, u64 tmfcmd
)
409 struct Scsi_Host
*host
= scp
->device
->host
;
410 struct cxlflash_cfg
*cfg
= shost_priv(host
);
411 struct afu_cmd
*cmd
= sc_to_afucz(scp
);
412 struct device
*dev
= &cfg
->dev
->dev
;
413 int hwq_index
= cmd_to_target_hwq(host
, scp
, afu
);
414 struct hwq
*hwq
= get_hwq(afu
, hwq_index
);
419 /* When Task Management Function is active do not send another */
420 spin_lock_irqsave(&cfg
->tmf_slock
, lock_flags
);
422 wait_event_interruptible_lock_irq(cfg
->tmf_waitq
,
425 cfg
->tmf_active
= true;
426 spin_unlock_irqrestore(&cfg
->tmf_slock
, lock_flags
);
431 cmd
->hwq_index
= hwq_index
;
433 cmd
->rcb
.ctx_id
= hwq
->ctx_hndl
;
434 cmd
->rcb
.msi
= SISL_MSI_RRQ_UPDATED
;
435 cmd
->rcb
.port_sel
= CHAN2PORTMASK(scp
->device
->channel
);
436 cmd
->rcb
.lun_id
= lun_to_lunid(scp
->device
->lun
);
437 cmd
->rcb
.req_flags
= (SISL_REQ_FLAGS_PORT_LUN_ID
|
438 SISL_REQ_FLAGS_SUP_UNDERRUN
|
439 SISL_REQ_FLAGS_TMF_CMD
);
440 memcpy(cmd
->rcb
.cdb
, &tmfcmd
, sizeof(tmfcmd
));
442 rc
= afu
->send_cmd(afu
, cmd
);
444 spin_lock_irqsave(&cfg
->tmf_slock
, lock_flags
);
445 cfg
->tmf_active
= false;
446 spin_unlock_irqrestore(&cfg
->tmf_slock
, lock_flags
);
450 spin_lock_irqsave(&cfg
->tmf_slock
, lock_flags
);
451 to
= msecs_to_jiffies(5000);
452 to
= wait_event_interruptible_lock_irq_timeout(cfg
->tmf_waitq
,
457 cfg
->tmf_active
= false;
458 dev_err(dev
, "%s: TMF timed out\n", __func__
);
461 spin_unlock_irqrestore(&cfg
->tmf_slock
, lock_flags
);
467 * cxlflash_driver_info() - information handler for this host driver
468 * @host: SCSI host associated with device.
470 * Return: A string describing the device.
472 static const char *cxlflash_driver_info(struct Scsi_Host
*host
)
474 return CXLFLASH_ADAPTER_NAME
;
478 * cxlflash_queuecommand() - sends a mid-layer request
479 * @host: SCSI host associated with device.
480 * @scp: SCSI command to send.
482 * Return: 0 on success, SCSI_MLQUEUE_HOST_BUSY on failure
484 static int cxlflash_queuecommand(struct Scsi_Host
*host
, struct scsi_cmnd
*scp
)
486 struct cxlflash_cfg
*cfg
= shost_priv(host
);
487 struct afu
*afu
= cfg
->afu
;
488 struct device
*dev
= &cfg
->dev
->dev
;
489 struct afu_cmd
*cmd
= sc_to_afucz(scp
);
490 struct scatterlist
*sg
= scsi_sglist(scp
);
491 int hwq_index
= cmd_to_target_hwq(host
, scp
, afu
);
492 struct hwq
*hwq
= get_hwq(afu
, hwq_index
);
493 u16 req_flags
= SISL_REQ_FLAGS_SUP_UNDERRUN
;
497 dev_dbg_ratelimited(dev
, "%s: (scp=%p) %d/%d/%d/%llu "
498 "cdb=(%08x-%08x-%08x-%08x)\n",
499 __func__
, scp
, host
->host_no
, scp
->device
->channel
,
500 scp
->device
->id
, scp
->device
->lun
,
501 get_unaligned_be32(&((u32
*)scp
->cmnd
)[0]),
502 get_unaligned_be32(&((u32
*)scp
->cmnd
)[1]),
503 get_unaligned_be32(&((u32
*)scp
->cmnd
)[2]),
504 get_unaligned_be32(&((u32
*)scp
->cmnd
)[3]));
507 * If a Task Management Function is active, wait for it to complete
508 * before continuing with regular commands.
510 spin_lock_irqsave(&cfg
->tmf_slock
, lock_flags
);
511 if (cfg
->tmf_active
) {
512 spin_unlock_irqrestore(&cfg
->tmf_slock
, lock_flags
);
513 rc
= SCSI_MLQUEUE_HOST_BUSY
;
516 spin_unlock_irqrestore(&cfg
->tmf_slock
, lock_flags
);
518 switch (cfg
->state
) {
522 dev_dbg_ratelimited(dev
, "%s: device is in reset\n", __func__
);
523 rc
= SCSI_MLQUEUE_HOST_BUSY
;
526 dev_dbg_ratelimited(dev
, "%s: device has failed\n", __func__
);
527 scp
->result
= (DID_NO_CONNECT
<< 16);
536 cmd
->rcb
.data_len
= sg
->length
;
537 cmd
->rcb
.data_ea
= (uintptr_t)sg_virt(sg
);
542 cmd
->hwq_index
= hwq_index
;
544 cmd
->rcb
.ctx_id
= hwq
->ctx_hndl
;
545 cmd
->rcb
.msi
= SISL_MSI_RRQ_UPDATED
;
546 cmd
->rcb
.port_sel
= CHAN2PORTMASK(scp
->device
->channel
);
547 cmd
->rcb
.lun_id
= lun_to_lunid(scp
->device
->lun
);
549 if (scp
->sc_data_direction
== DMA_TO_DEVICE
)
550 req_flags
|= SISL_REQ_FLAGS_HOST_WRITE
;
552 cmd
->rcb
.req_flags
= req_flags
;
553 memcpy(cmd
->rcb
.cdb
, scp
->cmnd
, sizeof(cmd
->rcb
.cdb
));
555 rc
= afu
->send_cmd(afu
, cmd
);
561 * cxlflash_wait_for_pci_err_recovery() - wait for error recovery during probe
562 * @cfg: Internal structure associated with the host.
564 static void cxlflash_wait_for_pci_err_recovery(struct cxlflash_cfg
*cfg
)
566 struct pci_dev
*pdev
= cfg
->dev
;
568 if (pci_channel_offline(pdev
))
569 wait_event_timeout(cfg
->reset_waitq
,
570 !pci_channel_offline(pdev
),
571 CXLFLASH_PCI_ERROR_RECOVERY_TIMEOUT
);
575 * free_mem() - free memory associated with the AFU
576 * @cfg: Internal structure associated with the host.
578 static void free_mem(struct cxlflash_cfg
*cfg
)
580 struct afu
*afu
= cfg
->afu
;
583 free_pages((ulong
)afu
, get_order(sizeof(struct afu
)));
589 * stop_afu() - stops the AFU command timers and unmaps the MMIO space
590 * @cfg: Internal structure associated with the host.
592 * Safe to call with AFU in a partially allocated/initialized state.
594 * Cancels scheduled worker threads, waits for any active internal AFU
595 * commands to timeout, disables IRQ polling and then unmaps the MMIO space.
597 static void stop_afu(struct cxlflash_cfg
*cfg
)
599 struct afu
*afu
= cfg
->afu
;
603 cancel_work_sync(&cfg
->work_q
);
606 while (atomic_read(&afu
->cmds_active
))
609 if (afu_is_irqpoll_enabled(afu
)) {
610 for (i
= 0; i
< afu
->num_hwqs
; i
++) {
611 hwq
= get_hwq(afu
, i
);
613 irq_poll_disable(&hwq
->irqpoll
);
617 if (likely(afu
->afu_map
)) {
618 cxl_psa_unmap((void __iomem
*)afu
->afu_map
);
625 * term_intr() - disables all AFU interrupts
626 * @cfg: Internal structure associated with the host.
627 * @level: Depth of allocation, where to begin waterfall tear down.
628 * @index: Index of the hardware queue.
630 * Safe to call with AFU/MC in partially allocated/initialized state.
632 static void term_intr(struct cxlflash_cfg
*cfg
, enum undo_level level
,
635 struct afu
*afu
= cfg
->afu
;
636 struct device
*dev
= &cfg
->dev
->dev
;
640 dev_err(dev
, "%s: returning with NULL afu\n", __func__
);
644 hwq
= get_hwq(afu
, index
);
647 dev_err(dev
, "%s: returning with NULL MC\n", __func__
);
653 /* SISL_MSI_ASYNC_ERROR is setup only for the primary HWQ */
654 if (index
== PRIMARY_HWQ
)
655 cxl_unmap_afu_irq(hwq
->ctx
, 3, hwq
);
657 cxl_unmap_afu_irq(hwq
->ctx
, 2, hwq
);
659 cxl_unmap_afu_irq(hwq
->ctx
, 1, hwq
);
661 cxl_free_afu_irqs(hwq
->ctx
);
664 /* No action required */
670 * term_mc() - terminates the master context
671 * @cfg: Internal structure associated with the host.
672 * @index: Index of the hardware queue.
674 * Safe to call with AFU/MC in partially allocated/initialized state.
676 static void term_mc(struct cxlflash_cfg
*cfg
, u32 index
)
678 struct afu
*afu
= cfg
->afu
;
679 struct device
*dev
= &cfg
->dev
->dev
;
683 dev_err(dev
, "%s: returning with NULL afu\n", __func__
);
687 hwq
= get_hwq(afu
, index
);
690 dev_err(dev
, "%s: returning with NULL MC\n", __func__
);
694 WARN_ON(cxl_stop_context(hwq
->ctx
));
695 if (index
!= PRIMARY_HWQ
)
696 WARN_ON(cxl_release_context(hwq
->ctx
));
701 * term_afu() - terminates the AFU
702 * @cfg: Internal structure associated with the host.
704 * Safe to call with AFU/MC in partially allocated/initialized state.
706 static void term_afu(struct cxlflash_cfg
*cfg
)
708 struct device
*dev
= &cfg
->dev
->dev
;
712 * Tear down is carefully orchestrated to ensure
713 * no interrupts can come in when the problem state
716 * 1) Disable all AFU interrupts for each master
717 * 2) Unmap the problem state area
718 * 3) Stop each master context
720 for (k
= cfg
->afu
->num_hwqs
- 1; k
>= 0; k
--)
721 term_intr(cfg
, UNMAP_THREE
, k
);
726 for (k
= cfg
->afu
->num_hwqs
- 1; k
>= 0; k
--)
729 dev_dbg(dev
, "%s: returning\n", __func__
);
733 * notify_shutdown() - notifies device of pending shutdown
734 * @cfg: Internal structure associated with the host.
735 * @wait: Whether to wait for shutdown processing to complete.
737 * This function will notify the AFU that the adapter is being shutdown
738 * and will wait for shutdown processing to complete if wait is true.
739 * This notification should flush pending I/Os to the device and halt
740 * further I/Os until the next AFU reset is issued and device restarted.
742 static void notify_shutdown(struct cxlflash_cfg
*cfg
, bool wait
)
744 struct afu
*afu
= cfg
->afu
;
745 struct device
*dev
= &cfg
->dev
->dev
;
746 struct dev_dependent_vals
*ddv
;
747 __be64 __iomem
*fc_port_regs
;
749 int i
, retry_cnt
= 0;
751 ddv
= (struct dev_dependent_vals
*)cfg
->dev_id
->driver_data
;
752 if (!(ddv
->flags
& CXLFLASH_NOTIFY_SHUTDOWN
))
755 if (!afu
|| !afu
->afu_map
) {
756 dev_dbg(dev
, "%s: Problem state area not mapped\n", __func__
);
761 for (i
= 0; i
< cfg
->num_fc_ports
; i
++) {
762 fc_port_regs
= get_fc_port_regs(cfg
, i
);
764 reg
= readq_be(&fc_port_regs
[FC_CONFIG2
/ 8]);
765 reg
|= SISL_FC_SHUTDOWN_NORMAL
;
766 writeq_be(reg
, &fc_port_regs
[FC_CONFIG2
/ 8]);
772 /* Wait up to 1.5 seconds for shutdown processing to complete */
773 for (i
= 0; i
< cfg
->num_fc_ports
; i
++) {
774 fc_port_regs
= get_fc_port_regs(cfg
, i
);
778 status
= readq_be(&fc_port_regs
[FC_STATUS
/ 8]);
779 if (status
& SISL_STATUS_SHUTDOWN_COMPLETE
)
781 if (++retry_cnt
>= MC_RETRY_CNT
) {
782 dev_dbg(dev
, "%s: port %d shutdown processing "
783 "not yet completed\n", __func__
, i
);
786 msleep(100 * retry_cnt
);
792 * cxlflash_remove() - PCI entry point to tear down host
793 * @pdev: PCI device associated with the host.
795 * Safe to use as a cleanup in partially allocated/initialized state. Note that
796 * the reset_waitq is flushed as part of the stop/termination of user contexts.
798 static void cxlflash_remove(struct pci_dev
*pdev
)
800 struct cxlflash_cfg
*cfg
= pci_get_drvdata(pdev
);
801 struct device
*dev
= &pdev
->dev
;
804 if (!pci_is_enabled(pdev
)) {
805 dev_dbg(dev
, "%s: Device is disabled\n", __func__
);
809 /* If a Task Management Function is active, wait for it to complete
810 * before continuing with remove.
812 spin_lock_irqsave(&cfg
->tmf_slock
, lock_flags
);
814 wait_event_interruptible_lock_irq(cfg
->tmf_waitq
,
817 spin_unlock_irqrestore(&cfg
->tmf_slock
, lock_flags
);
819 /* Notify AFU and wait for shutdown processing to complete */
820 notify_shutdown(cfg
, true);
822 cfg
->state
= STATE_FAILTERM
;
823 cxlflash_stop_term_user_contexts(cfg
);
825 switch (cfg
->init_state
) {
826 case INIT_STATE_SCSI
:
827 cxlflash_term_local_luns(cfg
);
828 scsi_remove_host(cfg
->host
);
832 pci_disable_device(pdev
);
833 case INIT_STATE_NONE
:
835 scsi_host_put(cfg
->host
);
839 dev_dbg(dev
, "%s: returning\n", __func__
);
843 * alloc_mem() - allocates the AFU and its command pool
844 * @cfg: Internal structure associated with the host.
846 * A partially allocated state remains on failure.
850 * -ENOMEM on failure to allocate memory
852 static int alloc_mem(struct cxlflash_cfg
*cfg
)
855 struct device
*dev
= &cfg
->dev
->dev
;
857 /* AFU is ~28k, i.e. only one 64k page or up to seven 4k pages */
858 cfg
->afu
= (void *)__get_free_pages(GFP_KERNEL
| __GFP_ZERO
,
859 get_order(sizeof(struct afu
)));
860 if (unlikely(!cfg
->afu
)) {
861 dev_err(dev
, "%s: cannot get %d free pages\n",
862 __func__
, get_order(sizeof(struct afu
)));
866 cfg
->afu
->parent
= cfg
;
867 cfg
->afu
->desired_hwqs
= CXLFLASH_DEF_HWQS
;
868 cfg
->afu
->afu_map
= NULL
;
874 * init_pci() - initializes the host as a PCI device
875 * @cfg: Internal structure associated with the host.
877 * Return: 0 on success, -errno on failure
879 static int init_pci(struct cxlflash_cfg
*cfg
)
881 struct pci_dev
*pdev
= cfg
->dev
;
882 struct device
*dev
= &cfg
->dev
->dev
;
885 rc
= pci_enable_device(pdev
);
886 if (rc
|| pci_channel_offline(pdev
)) {
887 if (pci_channel_offline(pdev
)) {
888 cxlflash_wait_for_pci_err_recovery(cfg
);
889 rc
= pci_enable_device(pdev
);
893 dev_err(dev
, "%s: Cannot enable adapter\n", __func__
);
894 cxlflash_wait_for_pci_err_recovery(cfg
);
900 dev_dbg(dev
, "%s: returning rc=%d\n", __func__
, rc
);
905 * init_scsi() - adds the host to the SCSI stack and kicks off host scan
906 * @cfg: Internal structure associated with the host.
908 * Return: 0 on success, -errno on failure
910 static int init_scsi(struct cxlflash_cfg
*cfg
)
912 struct pci_dev
*pdev
= cfg
->dev
;
913 struct device
*dev
= &cfg
->dev
->dev
;
916 rc
= scsi_add_host(cfg
->host
, &pdev
->dev
);
918 dev_err(dev
, "%s: scsi_add_host failed rc=%d\n", __func__
, rc
);
922 scsi_scan_host(cfg
->host
);
925 dev_dbg(dev
, "%s: returning rc=%d\n", __func__
, rc
);
930 * set_port_online() - transitions the specified host FC port to online state
931 * @fc_regs: Top of MMIO region defined for specified port.
933 * The provided MMIO region must be mapped prior to call. Online state means
934 * that the FC link layer has synced, completed the handshaking process, and
935 * is ready for login to start.
937 static void set_port_online(__be64 __iomem
*fc_regs
)
941 cmdcfg
= readq_be(&fc_regs
[FC_MTIP_CMDCONFIG
/ 8]);
942 cmdcfg
&= (~FC_MTIP_CMDCONFIG_OFFLINE
); /* clear OFF_LINE */
943 cmdcfg
|= (FC_MTIP_CMDCONFIG_ONLINE
); /* set ON_LINE */
944 writeq_be(cmdcfg
, &fc_regs
[FC_MTIP_CMDCONFIG
/ 8]);
948 * set_port_offline() - transitions the specified host FC port to offline state
949 * @fc_regs: Top of MMIO region defined for specified port.
951 * The provided MMIO region must be mapped prior to call.
953 static void set_port_offline(__be64 __iomem
*fc_regs
)
957 cmdcfg
= readq_be(&fc_regs
[FC_MTIP_CMDCONFIG
/ 8]);
958 cmdcfg
&= (~FC_MTIP_CMDCONFIG_ONLINE
); /* clear ON_LINE */
959 cmdcfg
|= (FC_MTIP_CMDCONFIG_OFFLINE
); /* set OFF_LINE */
960 writeq_be(cmdcfg
, &fc_regs
[FC_MTIP_CMDCONFIG
/ 8]);
964 * wait_port_online() - waits for the specified host FC port come online
965 * @fc_regs: Top of MMIO region defined for specified port.
966 * @delay_us: Number of microseconds to delay between reading port status.
967 * @nretry: Number of cycles to retry reading port status.
969 * The provided MMIO region must be mapped prior to call. This will timeout
970 * when the cable is not plugged in.
973 * TRUE (1) when the specified port is online
974 * FALSE (0) when the specified port fails to come online after timeout
976 static bool wait_port_online(__be64 __iomem
*fc_regs
, u32 delay_us
, u32 nretry
)
980 WARN_ON(delay_us
< 1000);
983 msleep(delay_us
/ 1000);
984 status
= readq_be(&fc_regs
[FC_MTIP_STATUS
/ 8]);
985 if (status
== U64_MAX
)
987 } while ((status
& FC_MTIP_STATUS_MASK
) != FC_MTIP_STATUS_ONLINE
&&
990 return ((status
& FC_MTIP_STATUS_MASK
) == FC_MTIP_STATUS_ONLINE
);
994 * wait_port_offline() - waits for the specified host FC port go offline
995 * @fc_regs: Top of MMIO region defined for specified port.
996 * @delay_us: Number of microseconds to delay between reading port status.
997 * @nretry: Number of cycles to retry reading port status.
999 * The provided MMIO region must be mapped prior to call.
1002 * TRUE (1) when the specified port is offline
1003 * FALSE (0) when the specified port fails to go offline after timeout
1005 static bool wait_port_offline(__be64 __iomem
*fc_regs
, u32 delay_us
, u32 nretry
)
1009 WARN_ON(delay_us
< 1000);
1012 msleep(delay_us
/ 1000);
1013 status
= readq_be(&fc_regs
[FC_MTIP_STATUS
/ 8]);
1014 if (status
== U64_MAX
)
1016 } while ((status
& FC_MTIP_STATUS_MASK
) != FC_MTIP_STATUS_OFFLINE
&&
1019 return ((status
& FC_MTIP_STATUS_MASK
) == FC_MTIP_STATUS_OFFLINE
);
1023 * afu_set_wwpn() - configures the WWPN for the specified host FC port
1024 * @afu: AFU associated with the host that owns the specified FC port.
1025 * @port: Port number being configured.
1026 * @fc_regs: Top of MMIO region defined for specified port.
1027 * @wwpn: The world-wide-port-number previously discovered for port.
1029 * The provided MMIO region must be mapped prior to call. As part of the
1030 * sequence to configure the WWPN, the port is toggled offline and then back
1031 * online. This toggling action can cause this routine to delay up to a few
1032 * seconds. When configured to use the internal LUN feature of the AFU, a
1033 * failure to come online is overridden.
1035 static void afu_set_wwpn(struct afu
*afu
, int port
, __be64 __iomem
*fc_regs
,
1038 struct cxlflash_cfg
*cfg
= afu
->parent
;
1039 struct device
*dev
= &cfg
->dev
->dev
;
1041 set_port_offline(fc_regs
);
1042 if (!wait_port_offline(fc_regs
, FC_PORT_STATUS_RETRY_INTERVAL_US
,
1043 FC_PORT_STATUS_RETRY_CNT
)) {
1044 dev_dbg(dev
, "%s: wait on port %d to go offline timed out\n",
1048 writeq_be(wwpn
, &fc_regs
[FC_PNAME
/ 8]);
1050 set_port_online(fc_regs
);
1051 if (!wait_port_online(fc_regs
, FC_PORT_STATUS_RETRY_INTERVAL_US
,
1052 FC_PORT_STATUS_RETRY_CNT
)) {
1053 dev_dbg(dev
, "%s: wait on port %d to go online timed out\n",
1059 * afu_link_reset() - resets the specified host FC port
1060 * @afu: AFU associated with the host that owns the specified FC port.
1061 * @port: Port number being configured.
1062 * @fc_regs: Top of MMIO region defined for specified port.
1064 * The provided MMIO region must be mapped prior to call. The sequence to
1065 * reset the port involves toggling it offline and then back online. This
1066 * action can cause this routine to delay up to a few seconds. An effort
1067 * is made to maintain link with the device by switching to host to use
1068 * the alternate port exclusively while the reset takes place.
1069 * failure to come online is overridden.
1071 static void afu_link_reset(struct afu
*afu
, int port
, __be64 __iomem
*fc_regs
)
1073 struct cxlflash_cfg
*cfg
= afu
->parent
;
1074 struct device
*dev
= &cfg
->dev
->dev
;
1077 /* first switch the AFU to the other links, if any */
1078 port_sel
= readq_be(&afu
->afu_map
->global
.regs
.afu_port_sel
);
1079 port_sel
&= ~(1ULL << port
);
1080 writeq_be(port_sel
, &afu
->afu_map
->global
.regs
.afu_port_sel
);
1081 cxlflash_afu_sync(afu
, 0, 0, AFU_GSYNC
);
1083 set_port_offline(fc_regs
);
1084 if (!wait_port_offline(fc_regs
, FC_PORT_STATUS_RETRY_INTERVAL_US
,
1085 FC_PORT_STATUS_RETRY_CNT
))
1086 dev_err(dev
, "%s: wait on port %d to go offline timed out\n",
1089 set_port_online(fc_regs
);
1090 if (!wait_port_online(fc_regs
, FC_PORT_STATUS_RETRY_INTERVAL_US
,
1091 FC_PORT_STATUS_RETRY_CNT
))
1092 dev_err(dev
, "%s: wait on port %d to go online timed out\n",
1095 /* switch back to include this port */
1096 port_sel
|= (1ULL << port
);
1097 writeq_be(port_sel
, &afu
->afu_map
->global
.regs
.afu_port_sel
);
1098 cxlflash_afu_sync(afu
, 0, 0, AFU_GSYNC
);
1100 dev_dbg(dev
, "%s: returning port_sel=%016llx\n", __func__
, port_sel
);
1104 * afu_err_intr_init() - clears and initializes the AFU for error interrupts
1105 * @afu: AFU associated with the host.
1107 static void afu_err_intr_init(struct afu
*afu
)
1109 struct cxlflash_cfg
*cfg
= afu
->parent
;
1110 __be64 __iomem
*fc_port_regs
;
1112 struct hwq
*hwq
= get_hwq(afu
, PRIMARY_HWQ
);
1115 /* global async interrupts: AFU clears afu_ctrl on context exit
1116 * if async interrupts were sent to that context. This prevents
1117 * the AFU form sending further async interrupts when
1119 * nobody to receive them.
1123 writeq_be(-1ULL, &afu
->afu_map
->global
.regs
.aintr_mask
);
1124 /* set LISN# to send and point to primary master context */
1125 reg
= ((u64
) (((hwq
->ctx_hndl
<< 8) | SISL_MSI_ASYNC_ERROR
)) << 40);
1127 if (afu
->internal_lun
)
1128 reg
|= 1; /* Bit 63 indicates local lun */
1129 writeq_be(reg
, &afu
->afu_map
->global
.regs
.afu_ctrl
);
1131 writeq_be(-1ULL, &afu
->afu_map
->global
.regs
.aintr_clear
);
1132 /* unmask bits that are of interest */
1133 /* note: afu can send an interrupt after this step */
1134 writeq_be(SISL_ASTATUS_MASK
, &afu
->afu_map
->global
.regs
.aintr_mask
);
1135 /* clear again in case a bit came on after previous clear but before */
1137 writeq_be(-1ULL, &afu
->afu_map
->global
.regs
.aintr_clear
);
1139 /* Clear/Set internal lun bits */
1140 fc_port_regs
= get_fc_port_regs(cfg
, 0);
1141 reg
= readq_be(&fc_port_regs
[FC_CONFIG2
/ 8]);
1142 reg
&= SISL_FC_INTERNAL_MASK
;
1143 if (afu
->internal_lun
)
1144 reg
|= ((u64
)(afu
->internal_lun
- 1) << SISL_FC_INTERNAL_SHIFT
);
1145 writeq_be(reg
, &fc_port_regs
[FC_CONFIG2
/ 8]);
1147 /* now clear FC errors */
1148 for (i
= 0; i
< cfg
->num_fc_ports
; i
++) {
1149 fc_port_regs
= get_fc_port_regs(cfg
, i
);
1151 writeq_be(0xFFFFFFFFU
, &fc_port_regs
[FC_ERROR
/ 8]);
1152 writeq_be(0, &fc_port_regs
[FC_ERRCAP
/ 8]);
1155 /* sync interrupts for master's IOARRIN write */
1156 /* note that unlike asyncs, there can be no pending sync interrupts */
1157 /* at this time (this is a fresh context and master has not written */
1158 /* IOARRIN yet), so there is nothing to clear. */
1160 /* set LISN#, it is always sent to the context that wrote IOARRIN */
1161 for (i
= 0; i
< afu
->num_hwqs
; i
++) {
1162 hwq
= get_hwq(afu
, i
);
1164 writeq_be(SISL_MSI_SYNC_ERROR
, &hwq
->host_map
->ctx_ctrl
);
1165 writeq_be(SISL_ISTATUS_MASK
, &hwq
->host_map
->intr_mask
);
1170 * cxlflash_sync_err_irq() - interrupt handler for synchronous errors
1171 * @irq: Interrupt number.
1172 * @data: Private data provided at interrupt registration, the AFU.
1174 * Return: Always return IRQ_HANDLED.
1176 static irqreturn_t
cxlflash_sync_err_irq(int irq
, void *data
)
1178 struct hwq
*hwq
= (struct hwq
*)data
;
1179 struct cxlflash_cfg
*cfg
= hwq
->afu
->parent
;
1180 struct device
*dev
= &cfg
->dev
->dev
;
1184 reg
= readq_be(&hwq
->host_map
->intr_status
);
1185 reg_unmasked
= (reg
& SISL_ISTATUS_UNMASK
);
1187 if (reg_unmasked
== 0UL) {
1188 dev_err(dev
, "%s: spurious interrupt, intr_status=%016llx\n",
1190 goto cxlflash_sync_err_irq_exit
;
1193 dev_err(dev
, "%s: unexpected interrupt, intr_status=%016llx\n",
1196 writeq_be(reg_unmasked
, &hwq
->host_map
->intr_clear
);
1198 cxlflash_sync_err_irq_exit
:
1203 * process_hrrq() - process the read-response queue
1204 * @afu: AFU associated with the host.
1205 * @doneq: Queue of commands harvested from the RRQ.
1206 * @budget: Threshold of RRQ entries to process.
1208 * This routine must be called holding the disabled RRQ spin lock.
1210 * Return: The number of entries processed.
1212 static int process_hrrq(struct hwq
*hwq
, struct list_head
*doneq
, int budget
)
1214 struct afu
*afu
= hwq
->afu
;
1215 struct afu_cmd
*cmd
;
1216 struct sisl_ioasa
*ioasa
;
1217 struct sisl_ioarcb
*ioarcb
;
1218 bool toggle
= hwq
->toggle
;
1221 *hrrq_start
= hwq
->hrrq_start
,
1222 *hrrq_end
= hwq
->hrrq_end
,
1223 *hrrq_curr
= hwq
->hrrq_curr
;
1225 /* Process ready RRQ entries up to the specified budget (if any) */
1229 if ((entry
& SISL_RESP_HANDLE_T_BIT
) != toggle
)
1232 entry
&= ~SISL_RESP_HANDLE_T_BIT
;
1234 if (afu_is_sq_cmd_mode(afu
)) {
1235 ioasa
= (struct sisl_ioasa
*)entry
;
1236 cmd
= container_of(ioasa
, struct afu_cmd
, sa
);
1238 ioarcb
= (struct sisl_ioarcb
*)entry
;
1239 cmd
= container_of(ioarcb
, struct afu_cmd
, rcb
);
1242 list_add_tail(&cmd
->queue
, doneq
);
1244 /* Advance to next entry or wrap and flip the toggle bit */
1245 if (hrrq_curr
< hrrq_end
)
1248 hrrq_curr
= hrrq_start
;
1249 toggle
^= SISL_RESP_HANDLE_T_BIT
;
1252 atomic_inc(&hwq
->hsq_credits
);
1255 if (budget
> 0 && num_hrrq
>= budget
)
1259 hwq
->hrrq_curr
= hrrq_curr
;
1260 hwq
->toggle
= toggle
;
1266 * process_cmd_doneq() - process a queue of harvested RRQ commands
1267 * @doneq: Queue of completed commands.
1269 * Note that upon return the queue can no longer be trusted.
1271 static void process_cmd_doneq(struct list_head
*doneq
)
1273 struct afu_cmd
*cmd
, *tmp
;
1275 WARN_ON(list_empty(doneq
));
1277 list_for_each_entry_safe(cmd
, tmp
, doneq
, queue
)
1282 * cxlflash_irqpoll() - process a queue of harvested RRQ commands
1283 * @irqpoll: IRQ poll structure associated with queue to poll.
1284 * @budget: Threshold of RRQ entries to process per poll.
1286 * Return: The number of entries processed.
1288 static int cxlflash_irqpoll(struct irq_poll
*irqpoll
, int budget
)
1290 struct hwq
*hwq
= container_of(irqpoll
, struct hwq
, irqpoll
);
1291 unsigned long hrrq_flags
;
1293 int num_entries
= 0;
1295 spin_lock_irqsave(&hwq
->hrrq_slock
, hrrq_flags
);
1297 num_entries
= process_hrrq(hwq
, &doneq
, budget
);
1298 if (num_entries
< budget
)
1299 irq_poll_complete(irqpoll
);
1301 spin_unlock_irqrestore(&hwq
->hrrq_slock
, hrrq_flags
);
1303 process_cmd_doneq(&doneq
);
1308 * cxlflash_rrq_irq() - interrupt handler for read-response queue (normal path)
1309 * @irq: Interrupt number.
1310 * @data: Private data provided at interrupt registration, the AFU.
1312 * Return: IRQ_HANDLED or IRQ_NONE when no ready entries found.
1314 static irqreturn_t
cxlflash_rrq_irq(int irq
, void *data
)
1316 struct hwq
*hwq
= (struct hwq
*)data
;
1317 struct afu
*afu
= hwq
->afu
;
1318 unsigned long hrrq_flags
;
1320 int num_entries
= 0;
1322 spin_lock_irqsave(&hwq
->hrrq_slock
, hrrq_flags
);
1324 if (afu_is_irqpoll_enabled(afu
)) {
1325 irq_poll_sched(&hwq
->irqpoll
);
1326 spin_unlock_irqrestore(&hwq
->hrrq_slock
, hrrq_flags
);
1330 num_entries
= process_hrrq(hwq
, &doneq
, -1);
1331 spin_unlock_irqrestore(&hwq
->hrrq_slock
, hrrq_flags
);
1333 if (num_entries
== 0)
1336 process_cmd_doneq(&doneq
);
1341 * Asynchronous interrupt information table
1344 * - Order matters here as this array is indexed by bit position.
1346 * - The checkpatch script considers the BUILD_SISL_ASTATUS_FC_PORT macro
1347 * as complex and complains due to a lack of parentheses/braces.
1349 #define ASTATUS_FC(_a, _b, _c, _d) \
1350 { SISL_ASTATUS_FC##_a##_##_b, _c, _a, (_d) }
1352 #define BUILD_SISL_ASTATUS_FC_PORT(_a) \
1353 ASTATUS_FC(_a, LINK_UP, "link up", 0), \
1354 ASTATUS_FC(_a, LINK_DN, "link down", 0), \
1355 ASTATUS_FC(_a, LOGI_S, "login succeeded", SCAN_HOST), \
1356 ASTATUS_FC(_a, LOGI_F, "login failed", CLR_FC_ERROR), \
1357 ASTATUS_FC(_a, LOGI_R, "login timed out, retrying", LINK_RESET), \
1358 ASTATUS_FC(_a, CRC_T, "CRC threshold exceeded", LINK_RESET), \
1359 ASTATUS_FC(_a, LOGO, "target initiated LOGO", 0), \
1360 ASTATUS_FC(_a, OTHER, "other error", CLR_FC_ERROR | LINK_RESET)
1362 static const struct asyc_intr_info ainfo
[] = {
1363 BUILD_SISL_ASTATUS_FC_PORT(1),
1364 BUILD_SISL_ASTATUS_FC_PORT(0),
1365 BUILD_SISL_ASTATUS_FC_PORT(3),
1366 BUILD_SISL_ASTATUS_FC_PORT(2)
1370 * cxlflash_async_err_irq() - interrupt handler for asynchronous errors
1371 * @irq: Interrupt number.
1372 * @data: Private data provided at interrupt registration, the AFU.
1374 * Return: Always return IRQ_HANDLED.
1376 static irqreturn_t
cxlflash_async_err_irq(int irq
, void *data
)
1378 struct hwq
*hwq
= (struct hwq
*)data
;
1379 struct afu
*afu
= hwq
->afu
;
1380 struct cxlflash_cfg
*cfg
= afu
->parent
;
1381 struct device
*dev
= &cfg
->dev
->dev
;
1382 const struct asyc_intr_info
*info
;
1383 struct sisl_global_map __iomem
*global
= &afu
->afu_map
->global
;
1384 __be64 __iomem
*fc_port_regs
;
1390 reg
= readq_be(&global
->regs
.aintr_status
);
1391 reg_unmasked
= (reg
& SISL_ASTATUS_UNMASK
);
1393 if (unlikely(reg_unmasked
== 0)) {
1394 dev_err(dev
, "%s: spurious interrupt, aintr_status=%016llx\n",
1399 /* FYI, it is 'okay' to clear AFU status before FC_ERROR */
1400 writeq_be(reg_unmasked
, &global
->regs
.aintr_clear
);
1402 /* Check each bit that is on */
1403 for_each_set_bit(bit
, (ulong
*)®_unmasked
, BITS_PER_LONG
) {
1404 if (unlikely(bit
>= ARRAY_SIZE(ainfo
))) {
1410 if (unlikely(info
->status
!= 1ULL << bit
)) {
1416 fc_port_regs
= get_fc_port_regs(cfg
, port
);
1418 dev_err(dev
, "%s: FC Port %d -> %s, fc_status=%016llx\n",
1419 __func__
, port
, info
->desc
,
1420 readq_be(&fc_port_regs
[FC_STATUS
/ 8]));
1423 * Do link reset first, some OTHER errors will set FC_ERROR
1424 * again if cleared before or w/o a reset
1426 if (info
->action
& LINK_RESET
) {
1427 dev_err(dev
, "%s: FC Port %d: resetting link\n",
1429 cfg
->lr_state
= LINK_RESET_REQUIRED
;
1430 cfg
->lr_port
= port
;
1431 schedule_work(&cfg
->work_q
);
1434 if (info
->action
& CLR_FC_ERROR
) {
1435 reg
= readq_be(&fc_port_regs
[FC_ERROR
/ 8]);
1438 * Since all errors are unmasked, FC_ERROR and FC_ERRCAP
1439 * should be the same and tracing one is sufficient.
1442 dev_err(dev
, "%s: fc %d: clearing fc_error=%016llx\n",
1443 __func__
, port
, reg
);
1445 writeq_be(reg
, &fc_port_regs
[FC_ERROR
/ 8]);
1446 writeq_be(0, &fc_port_regs
[FC_ERRCAP
/ 8]);
1449 if (info
->action
& SCAN_HOST
) {
1450 atomic_inc(&cfg
->scan_host_needed
);
1451 schedule_work(&cfg
->work_q
);
1460 * start_context() - starts the master context
1461 * @cfg: Internal structure associated with the host.
1462 * @index: Index of the hardware queue.
1464 * Return: A success or failure value from CXL services.
1466 static int start_context(struct cxlflash_cfg
*cfg
, u32 index
)
1468 struct device
*dev
= &cfg
->dev
->dev
;
1469 struct hwq
*hwq
= get_hwq(cfg
->afu
, index
);
1472 rc
= cxl_start_context(hwq
->ctx
,
1473 hwq
->work
.work_element_descriptor
,
1476 dev_dbg(dev
, "%s: returning rc=%d\n", __func__
, rc
);
1481 * read_vpd() - obtains the WWPNs from VPD
1482 * @cfg: Internal structure associated with the host.
1483 * @wwpn: Array of size MAX_FC_PORTS to pass back WWPNs
1485 * Return: 0 on success, -errno on failure
1487 static int read_vpd(struct cxlflash_cfg
*cfg
, u64 wwpn
[])
1489 struct device
*dev
= &cfg
->dev
->dev
;
1490 struct pci_dev
*pdev
= cfg
->dev
;
1492 int ro_start
, ro_size
, i
, j
, k
;
1494 char vpd_data
[CXLFLASH_VPD_LEN
];
1495 char tmp_buf
[WWPN_BUF_LEN
] = { 0 };
1496 char *wwpn_vpd_tags
[MAX_FC_PORTS
] = { "V5", "V6", "V7", "V8" };
1498 /* Get the VPD data from the device */
1499 vpd_size
= cxl_read_adapter_vpd(pdev
, vpd_data
, sizeof(vpd_data
));
1500 if (unlikely(vpd_size
<= 0)) {
1501 dev_err(dev
, "%s: Unable to read VPD (size = %ld)\n",
1502 __func__
, vpd_size
);
1507 /* Get the read only section offset */
1508 ro_start
= pci_vpd_find_tag(vpd_data
, 0, vpd_size
,
1509 PCI_VPD_LRDT_RO_DATA
);
1510 if (unlikely(ro_start
< 0)) {
1511 dev_err(dev
, "%s: VPD Read-only data not found\n", __func__
);
1516 /* Get the read only section size, cap when extends beyond read VPD */
1517 ro_size
= pci_vpd_lrdt_size(&vpd_data
[ro_start
]);
1519 i
= ro_start
+ PCI_VPD_LRDT_TAG_SIZE
;
1520 if (unlikely((i
+ j
) > vpd_size
)) {
1521 dev_dbg(dev
, "%s: Might need to read more VPD (%d > %ld)\n",
1522 __func__
, (i
+ j
), vpd_size
);
1523 ro_size
= vpd_size
- i
;
1527 * Find the offset of the WWPN tag within the read only
1528 * VPD data and validate the found field (partials are
1529 * no good to us). Convert the ASCII data to an integer
1530 * value. Note that we must copy to a temporary buffer
1531 * because the conversion service requires that the ASCII
1532 * string be terminated.
1534 for (k
= 0; k
< cfg
->num_fc_ports
; k
++) {
1536 i
= ro_start
+ PCI_VPD_LRDT_TAG_SIZE
;
1538 i
= pci_vpd_find_info_keyword(vpd_data
, i
, j
, wwpn_vpd_tags
[k
]);
1539 if (unlikely(i
< 0)) {
1540 dev_err(dev
, "%s: Port %d WWPN not found in VPD\n",
1546 j
= pci_vpd_info_field_size(&vpd_data
[i
]);
1547 i
+= PCI_VPD_INFO_FLD_HDR_SIZE
;
1548 if (unlikely((i
+ j
> vpd_size
) || (j
!= WWPN_LEN
))) {
1549 dev_err(dev
, "%s: Port %d WWPN incomplete or bad VPD\n",
1555 memcpy(tmp_buf
, &vpd_data
[i
], WWPN_LEN
);
1556 rc
= kstrtoul(tmp_buf
, WWPN_LEN
, (ulong
*)&wwpn
[k
]);
1558 dev_err(dev
, "%s: WWPN conversion failed for port %d\n",
1564 dev_dbg(dev
, "%s: wwpn%d=%016llx\n", __func__
, k
, wwpn
[k
]);
1568 dev_dbg(dev
, "%s: returning rc=%d\n", __func__
, rc
);
1573 * init_pcr() - initialize the provisioning and control registers
1574 * @cfg: Internal structure associated with the host.
1576 * Also sets up fast access to the mapped registers and initializes AFU
1577 * command fields that never change.
1579 static void init_pcr(struct cxlflash_cfg
*cfg
)
1581 struct afu
*afu
= cfg
->afu
;
1582 struct sisl_ctrl_map __iomem
*ctrl_map
;
1586 for (i
= 0; i
< MAX_CONTEXT
; i
++) {
1587 ctrl_map
= &afu
->afu_map
->ctrls
[i
].ctrl
;
1588 /* Disrupt any clients that could be running */
1589 /* e.g. clients that survived a master restart */
1590 writeq_be(0, &ctrl_map
->rht_start
);
1591 writeq_be(0, &ctrl_map
->rht_cnt_id
);
1592 writeq_be(0, &ctrl_map
->ctx_cap
);
1595 /* Copy frequently used fields into hwq */
1596 for (i
= 0; i
< afu
->num_hwqs
; i
++) {
1597 hwq
= get_hwq(afu
, i
);
1599 hwq
->ctx_hndl
= (u16
) cxl_process_element(hwq
->ctx
);
1600 hwq
->host_map
= &afu
->afu_map
->hosts
[hwq
->ctx_hndl
].host
;
1601 hwq
->ctrl_map
= &afu
->afu_map
->ctrls
[hwq
->ctx_hndl
].ctrl
;
1603 /* Program the Endian Control for the master context */
1604 writeq_be(SISL_ENDIAN_CTRL
, &hwq
->host_map
->endian_ctrl
);
1609 * init_global() - initialize AFU global registers
1610 * @cfg: Internal structure associated with the host.
1612 static int init_global(struct cxlflash_cfg
*cfg
)
1614 struct afu
*afu
= cfg
->afu
;
1615 struct device
*dev
= &cfg
->dev
->dev
;
1617 struct sisl_host_map __iomem
*hmap
;
1618 __be64 __iomem
*fc_port_regs
;
1619 u64 wwpn
[MAX_FC_PORTS
]; /* wwpn of AFU ports */
1620 int i
= 0, num_ports
= 0;
1624 rc
= read_vpd(cfg
, &wwpn
[0]);
1626 dev_err(dev
, "%s: could not read vpd rc=%d\n", __func__
, rc
);
1630 /* Set up RRQ and SQ in HWQ for master issued cmds */
1631 for (i
= 0; i
< afu
->num_hwqs
; i
++) {
1632 hwq
= get_hwq(afu
, i
);
1633 hmap
= hwq
->host_map
;
1635 writeq_be((u64
) hwq
->hrrq_start
, &hmap
->rrq_start
);
1636 writeq_be((u64
) hwq
->hrrq_end
, &hmap
->rrq_end
);
1638 if (afu_is_sq_cmd_mode(afu
)) {
1639 writeq_be((u64
)hwq
->hsq_start
, &hmap
->sq_start
);
1640 writeq_be((u64
)hwq
->hsq_end
, &hmap
->sq_end
);
1644 /* AFU configuration */
1645 reg
= readq_be(&afu
->afu_map
->global
.regs
.afu_config
);
1646 reg
|= SISL_AFUCONF_AR_ALL
|SISL_AFUCONF_ENDIAN
;
1647 /* enable all auto retry options and control endianness */
1648 /* leave others at default: */
1649 /* CTX_CAP write protected, mbox_r does not clear on read and */
1650 /* checker on if dual afu */
1651 writeq_be(reg
, &afu
->afu_map
->global
.regs
.afu_config
);
1653 /* Global port select: select either port */
1654 if (afu
->internal_lun
) {
1655 /* Only use port 0 */
1656 writeq_be(PORT0
, &afu
->afu_map
->global
.regs
.afu_port_sel
);
1659 writeq_be(PORT_MASK(cfg
->num_fc_ports
),
1660 &afu
->afu_map
->global
.regs
.afu_port_sel
);
1661 num_ports
= cfg
->num_fc_ports
;
1664 for (i
= 0; i
< num_ports
; i
++) {
1665 fc_port_regs
= get_fc_port_regs(cfg
, i
);
1667 /* Unmask all errors (but they are still masked at AFU) */
1668 writeq_be(0, &fc_port_regs
[FC_ERRMSK
/ 8]);
1669 /* Clear CRC error cnt & set a threshold */
1670 (void)readq_be(&fc_port_regs
[FC_CNT_CRCERR
/ 8]);
1671 writeq_be(MC_CRC_THRESH
, &fc_port_regs
[FC_CRC_THRESH
/ 8]);
1673 /* Set WWPNs. If already programmed, wwpn[i] is 0 */
1675 afu_set_wwpn(afu
, i
, &fc_port_regs
[0], wwpn
[i
]);
1676 /* Programming WWPN back to back causes additional
1677 * offline/online transitions and a PLOGI
1682 /* Set up master's own CTX_CAP to allow real mode, host translation */
1683 /* tables, afu cmds and read/write GSCSI cmds. */
1684 /* First, unlock ctx_cap write by reading mbox */
1685 for (i
= 0; i
< afu
->num_hwqs
; i
++) {
1686 hwq
= get_hwq(afu
, i
);
1688 (void)readq_be(&hwq
->ctrl_map
->mbox_r
); /* unlock ctx_cap */
1689 writeq_be((SISL_CTX_CAP_REAL_MODE
| SISL_CTX_CAP_HOST_XLATE
|
1690 SISL_CTX_CAP_READ_CMD
| SISL_CTX_CAP_WRITE_CMD
|
1691 SISL_CTX_CAP_AFU_CMD
| SISL_CTX_CAP_GSCSI_CMD
),
1692 &hwq
->ctrl_map
->ctx_cap
);
1694 /* Initialize heartbeat */
1695 afu
->hb
= readq_be(&afu
->afu_map
->global
.regs
.afu_hb
);
1701 * start_afu() - initializes and starts the AFU
1702 * @cfg: Internal structure associated with the host.
1704 static int start_afu(struct cxlflash_cfg
*cfg
)
1706 struct afu
*afu
= cfg
->afu
;
1707 struct device
*dev
= &cfg
->dev
->dev
;
1714 /* Initialize each HWQ */
1715 for (i
= 0; i
< afu
->num_hwqs
; i
++) {
1716 hwq
= get_hwq(afu
, i
);
1718 /* After an AFU reset, RRQ entries are stale, clear them */
1719 memset(&hwq
->rrq_entry
, 0, sizeof(hwq
->rrq_entry
));
1721 /* Initialize RRQ pointers */
1722 hwq
->hrrq_start
= &hwq
->rrq_entry
[0];
1723 hwq
->hrrq_end
= &hwq
->rrq_entry
[NUM_RRQ_ENTRY
- 1];
1724 hwq
->hrrq_curr
= hwq
->hrrq_start
;
1727 /* Initialize spin locks */
1728 spin_lock_init(&hwq
->hrrq_slock
);
1729 spin_lock_init(&hwq
->hsq_slock
);
1732 if (afu_is_sq_cmd_mode(afu
)) {
1733 memset(&hwq
->sq
, 0, sizeof(hwq
->sq
));
1734 hwq
->hsq_start
= &hwq
->sq
[0];
1735 hwq
->hsq_end
= &hwq
->sq
[NUM_SQ_ENTRY
- 1];
1736 hwq
->hsq_curr
= hwq
->hsq_start
;
1738 atomic_set(&hwq
->hsq_credits
, NUM_SQ_ENTRY
- 1);
1741 /* Initialize IRQ poll */
1742 if (afu_is_irqpoll_enabled(afu
))
1743 irq_poll_init(&hwq
->irqpoll
, afu
->irqpoll_weight
,
1748 rc
= init_global(cfg
);
1750 dev_dbg(dev
, "%s: returning rc=%d\n", __func__
, rc
);
1755 * init_intr() - setup interrupt handlers for the master context
1756 * @cfg: Internal structure associated with the host.
1757 * @hwq: Hardware queue to initialize.
1759 * Return: 0 on success, -errno on failure
1761 static enum undo_level
init_intr(struct cxlflash_cfg
*cfg
,
1764 struct device
*dev
= &cfg
->dev
->dev
;
1765 struct cxl_context
*ctx
= hwq
->ctx
;
1767 enum undo_level level
= UNDO_NOOP
;
1768 bool is_primary_hwq
= (hwq
->index
== PRIMARY_HWQ
);
1769 int num_irqs
= is_primary_hwq
? 3 : 2;
1771 rc
= cxl_allocate_afu_irqs(ctx
, num_irqs
);
1773 dev_err(dev
, "%s: allocate_afu_irqs failed rc=%d\n",
1779 rc
= cxl_map_afu_irq(ctx
, 1, cxlflash_sync_err_irq
, hwq
,
1780 "SISL_MSI_SYNC_ERROR");
1781 if (unlikely(rc
<= 0)) {
1782 dev_err(dev
, "%s: SISL_MSI_SYNC_ERROR map failed\n", __func__
);
1787 rc
= cxl_map_afu_irq(ctx
, 2, cxlflash_rrq_irq
, hwq
,
1788 "SISL_MSI_RRQ_UPDATED");
1789 if (unlikely(rc
<= 0)) {
1790 dev_err(dev
, "%s: SISL_MSI_RRQ_UPDATED map failed\n", __func__
);
1795 /* SISL_MSI_ASYNC_ERROR is setup only for the primary HWQ */
1796 if (!is_primary_hwq
)
1799 rc
= cxl_map_afu_irq(ctx
, 3, cxlflash_async_err_irq
, hwq
,
1800 "SISL_MSI_ASYNC_ERROR");
1801 if (unlikely(rc
<= 0)) {
1802 dev_err(dev
, "%s: SISL_MSI_ASYNC_ERROR map failed\n", __func__
);
1811 * init_mc() - create and register as the master context
1812 * @cfg: Internal structure associated with the host.
1813 * index: HWQ Index of the master context.
1815 * Return: 0 on success, -errno on failure
1817 static int init_mc(struct cxlflash_cfg
*cfg
, u32 index
)
1819 struct cxl_context
*ctx
;
1820 struct device
*dev
= &cfg
->dev
->dev
;
1821 struct hwq
*hwq
= get_hwq(cfg
->afu
, index
);
1823 enum undo_level level
;
1825 hwq
->afu
= cfg
->afu
;
1828 if (index
== PRIMARY_HWQ
)
1829 ctx
= cxl_get_context(cfg
->dev
);
1831 ctx
= cxl_dev_context_init(cfg
->dev
);
1832 if (unlikely(!ctx
)) {
1840 /* Set it up as a master with the CXL */
1841 cxl_set_master(ctx
);
1843 /* Reset AFU when initializing primary context */
1844 if (index
== PRIMARY_HWQ
) {
1845 rc
= cxl_afu_reset(ctx
);
1847 dev_err(dev
, "%s: AFU reset failed rc=%d\n",
1853 level
= init_intr(cfg
, hwq
);
1854 if (unlikely(level
)) {
1855 dev_err(dev
, "%s: interrupt init failed rc=%d\n", __func__
, rc
);
1859 /* This performs the equivalent of the CXL_IOCTL_START_WORK.
1860 * The CXL_IOCTL_GET_PROCESS_ELEMENT is implicit in the process
1861 * element (pe) that is embedded in the context (ctx)
1863 rc
= start_context(cfg
, index
);
1865 dev_err(dev
, "%s: start context failed rc=%d\n", __func__
, rc
);
1866 level
= UNMAP_THREE
;
1871 dev_dbg(dev
, "%s: returning rc=%d\n", __func__
, rc
);
1874 term_intr(cfg
, level
, index
);
1875 if (index
!= PRIMARY_HWQ
)
1876 cxl_release_context(ctx
);
1883 * get_num_afu_ports() - determines and configures the number of AFU ports
1884 * @cfg: Internal structure associated with the host.
1886 * This routine determines the number of AFU ports by converting the global
1887 * port selection mask. The converted value is only valid following an AFU
1888 * reset (explicit or power-on). This routine must be invoked shortly after
1889 * mapping as other routines are dependent on the number of ports during the
1890 * initialization sequence.
1892 * To support legacy AFUs that might not have reflected an initial global
1893 * port mask (value read is 0), default to the number of ports originally
1894 * supported by the cxlflash driver (2) before hardware with other port
1895 * offerings was introduced.
1897 static void get_num_afu_ports(struct cxlflash_cfg
*cfg
)
1899 struct afu
*afu
= cfg
->afu
;
1900 struct device
*dev
= &cfg
->dev
->dev
;
1902 int num_fc_ports
= LEGACY_FC_PORTS
;
1904 port_mask
= readq_be(&afu
->afu_map
->global
.regs
.afu_port_sel
);
1905 if (port_mask
!= 0ULL)
1906 num_fc_ports
= min(ilog2(port_mask
) + 1, MAX_FC_PORTS
);
1908 dev_dbg(dev
, "%s: port_mask=%016llx num_fc_ports=%d\n",
1909 __func__
, port_mask
, num_fc_ports
);
1911 cfg
->num_fc_ports
= num_fc_ports
;
1912 cfg
->host
->max_channel
= PORTNUM2CHAN(num_fc_ports
);
1916 * init_afu() - setup as master context and start AFU
1917 * @cfg: Internal structure associated with the host.
1919 * This routine is a higher level of control for configuring the
1920 * AFU on probe and reset paths.
1922 * Return: 0 on success, -errno on failure
1924 static int init_afu(struct cxlflash_cfg
*cfg
)
1928 struct afu
*afu
= cfg
->afu
;
1929 struct device
*dev
= &cfg
->dev
->dev
;
1933 cxl_perst_reloads_same_image(cfg
->cxl_afu
, true);
1935 afu
->num_hwqs
= afu
->desired_hwqs
;
1936 for (i
= 0; i
< afu
->num_hwqs
; i
++) {
1937 rc
= init_mc(cfg
, i
);
1939 dev_err(dev
, "%s: init_mc failed rc=%d index=%d\n",
1945 /* Map the entire MMIO space of the AFU using the first context */
1946 hwq
= get_hwq(afu
, PRIMARY_HWQ
);
1947 afu
->afu_map
= cxl_psa_map(hwq
->ctx
);
1948 if (!afu
->afu_map
) {
1949 dev_err(dev
, "%s: cxl_psa_map failed\n", __func__
);
1954 /* No byte reverse on reading afu_version or string will be backwards */
1955 reg
= readq(&afu
->afu_map
->global
.regs
.afu_version
);
1956 memcpy(afu
->version
, ®
, sizeof(reg
));
1957 afu
->interface_version
=
1958 readq_be(&afu
->afu_map
->global
.regs
.interface_version
);
1959 if ((afu
->interface_version
+ 1) == 0) {
1960 dev_err(dev
, "Back level AFU, please upgrade. AFU version %s "
1961 "interface version %016llx\n", afu
->version
,
1962 afu
->interface_version
);
1967 if (afu_is_sq_cmd_mode(afu
)) {
1968 afu
->send_cmd
= send_cmd_sq
;
1969 afu
->context_reset
= context_reset_sq
;
1971 afu
->send_cmd
= send_cmd_ioarrin
;
1972 afu
->context_reset
= context_reset_ioarrin
;
1975 dev_dbg(dev
, "%s: afu_ver=%s interface_ver=%016llx\n", __func__
,
1976 afu
->version
, afu
->interface_version
);
1978 get_num_afu_ports(cfg
);
1980 rc
= start_afu(cfg
);
1982 dev_err(dev
, "%s: start_afu failed, rc=%d\n", __func__
, rc
);
1986 afu_err_intr_init(cfg
->afu
);
1987 for (i
= 0; i
< afu
->num_hwqs
; i
++) {
1988 hwq
= get_hwq(afu
, i
);
1990 hwq
->room
= readq_be(&hwq
->host_map
->cmd_room
);
1993 /* Restore the LUN mappings */
1994 cxlflash_restore_luntable(cfg
);
1996 dev_dbg(dev
, "%s: returning rc=%d\n", __func__
, rc
);
2000 for (i
= afu
->num_hwqs
- 1; i
>= 0; i
--) {
2001 term_intr(cfg
, UNMAP_THREE
, i
);
2008 * cxlflash_afu_sync() - builds and sends an AFU sync command
2009 * @afu: AFU associated with the host.
2010 * @ctx_hndl_u: Identifies context requesting sync.
2011 * @res_hndl_u: Identifies resource requesting sync.
2012 * @mode: Type of sync to issue (lightweight, heavyweight, global).
2014 * The AFU can only take 1 sync command at a time. This routine enforces this
2015 * limitation by using a mutex to provide exclusive access to the AFU during
2016 * the sync. This design point requires calling threads to not be on interrupt
2017 * context due to the possibility of sleeping during concurrent sync operations.
2019 * AFU sync operations are only necessary and allowed when the device is
2020 * operating normally. When not operating normally, sync requests can occur as
2021 * part of cleaning up resources associated with an adapter prior to removal.
2022 * In this scenario, these requests are simply ignored (safe due to the AFU
2026 * 0 on success, -errno on failure
2028 int cxlflash_afu_sync(struct afu
*afu
, ctx_hndl_t ctx_hndl_u
,
2029 res_hndl_t res_hndl_u
, u8 mode
)
2031 struct cxlflash_cfg
*cfg
= afu
->parent
;
2032 struct device
*dev
= &cfg
->dev
->dev
;
2033 struct afu_cmd
*cmd
= NULL
;
2034 struct hwq
*hwq
= get_hwq(afu
, PRIMARY_HWQ
);
2038 static DEFINE_MUTEX(sync_active
);
2040 if (cfg
->state
!= STATE_NORMAL
) {
2041 dev_dbg(dev
, "%s: Sync not required state=%u\n",
2042 __func__
, cfg
->state
);
2046 mutex_lock(&sync_active
);
2047 atomic_inc(&afu
->cmds_active
);
2048 buf
= kzalloc(sizeof(*cmd
) + __alignof__(*cmd
) - 1, GFP_KERNEL
);
2049 if (unlikely(!buf
)) {
2050 dev_err(dev
, "%s: no memory for command\n", __func__
);
2055 cmd
= (struct afu_cmd
*)PTR_ALIGN(buf
, __alignof__(*cmd
));
2058 init_completion(&cmd
->cevent
);
2060 cmd
->hwq_index
= hwq
->index
;
2062 dev_dbg(dev
, "%s: afu=%p cmd=%p ctx=%d nretry=%d\n",
2063 __func__
, afu
, cmd
, ctx_hndl_u
, nretry
);
2065 cmd
->rcb
.req_flags
= SISL_REQ_FLAGS_AFU_CMD
;
2066 cmd
->rcb
.ctx_id
= hwq
->ctx_hndl
;
2067 cmd
->rcb
.msi
= SISL_MSI_RRQ_UPDATED
;
2068 cmd
->rcb
.timeout
= MC_AFU_SYNC_TIMEOUT
;
2070 cmd
->rcb
.cdb
[0] = 0xC0; /* AFU Sync */
2071 cmd
->rcb
.cdb
[1] = mode
;
2073 /* The cdb is aligned, no unaligned accessors required */
2074 *((__be16
*)&cmd
->rcb
.cdb
[2]) = cpu_to_be16(ctx_hndl_u
);
2075 *((__be32
*)&cmd
->rcb
.cdb
[4]) = cpu_to_be32(res_hndl_u
);
2077 rc
= afu
->send_cmd(afu
, cmd
);
2083 rc
= wait_resp(afu
, cmd
);
2084 if (rc
== -ETIMEDOUT
) {
2085 rc
= afu
->context_reset(hwq
);
2086 if (!rc
&& ++nretry
< 2)
2091 atomic_dec(&afu
->cmds_active
);
2092 mutex_unlock(&sync_active
);
2094 dev_dbg(dev
, "%s: returning rc=%d\n", __func__
, rc
);
2099 * afu_reset() - resets the AFU
2100 * @cfg: Internal structure associated with the host.
2102 * Return: 0 on success, -errno on failure
2104 static int afu_reset(struct cxlflash_cfg
*cfg
)
2106 struct device
*dev
= &cfg
->dev
->dev
;
2109 /* Stop the context before the reset. Since the context is
2110 * no longer available restart it after the reset is complete
2116 dev_dbg(dev
, "%s: returning rc=%d\n", __func__
, rc
);
2121 * drain_ioctls() - wait until all currently executing ioctls have completed
2122 * @cfg: Internal structure associated with the host.
2124 * Obtain write access to read/write semaphore that wraps ioctl
2125 * handling to 'drain' ioctls currently executing.
2127 static void drain_ioctls(struct cxlflash_cfg
*cfg
)
2129 down_write(&cfg
->ioctl_rwsem
);
2130 up_write(&cfg
->ioctl_rwsem
);
2134 * cxlflash_eh_device_reset_handler() - reset a single LUN
2135 * @scp: SCSI command to send.
2138 * SUCCESS as defined in scsi/scsi.h
2139 * FAILED as defined in scsi/scsi.h
2141 static int cxlflash_eh_device_reset_handler(struct scsi_cmnd
*scp
)
2144 struct Scsi_Host
*host
= scp
->device
->host
;
2145 struct cxlflash_cfg
*cfg
= shost_priv(host
);
2146 struct device
*dev
= &cfg
->dev
->dev
;
2147 struct afu
*afu
= cfg
->afu
;
2150 dev_dbg(dev
, "%s: (scp=%p) %d/%d/%d/%llu "
2151 "cdb=(%08x-%08x-%08x-%08x)\n", __func__
, scp
, host
->host_no
,
2152 scp
->device
->channel
, scp
->device
->id
, scp
->device
->lun
,
2153 get_unaligned_be32(&((u32
*)scp
->cmnd
)[0]),
2154 get_unaligned_be32(&((u32
*)scp
->cmnd
)[1]),
2155 get_unaligned_be32(&((u32
*)scp
->cmnd
)[2]),
2156 get_unaligned_be32(&((u32
*)scp
->cmnd
)[3]));
2159 switch (cfg
->state
) {
2161 rcr
= send_tmf(afu
, scp
, TMF_LUN_RESET
);
2166 wait_event(cfg
->reset_waitq
, cfg
->state
!= STATE_RESET
);
2173 dev_dbg(dev
, "%s: returning rc=%d\n", __func__
, rc
);
2178 * cxlflash_eh_host_reset_handler() - reset the host adapter
2179 * @scp: SCSI command from stack identifying host.
2181 * Following a reset, the state is evaluated again in case an EEH occurred
2182 * during the reset. In such a scenario, the host reset will either yield
2183 * until the EEH recovery is complete or return success or failure based
2184 * upon the current device state.
2187 * SUCCESS as defined in scsi/scsi.h
2188 * FAILED as defined in scsi/scsi.h
2190 static int cxlflash_eh_host_reset_handler(struct scsi_cmnd
*scp
)
2194 struct Scsi_Host
*host
= scp
->device
->host
;
2195 struct cxlflash_cfg
*cfg
= shost_priv(host
);
2196 struct device
*dev
= &cfg
->dev
->dev
;
2198 dev_dbg(dev
, "%s: (scp=%p) %d/%d/%d/%llu "
2199 "cdb=(%08x-%08x-%08x-%08x)\n", __func__
, scp
, host
->host_no
,
2200 scp
->device
->channel
, scp
->device
->id
, scp
->device
->lun
,
2201 get_unaligned_be32(&((u32
*)scp
->cmnd
)[0]),
2202 get_unaligned_be32(&((u32
*)scp
->cmnd
)[1]),
2203 get_unaligned_be32(&((u32
*)scp
->cmnd
)[2]),
2204 get_unaligned_be32(&((u32
*)scp
->cmnd
)[3]));
2206 switch (cfg
->state
) {
2208 cfg
->state
= STATE_RESET
;
2210 cxlflash_mark_contexts_error(cfg
);
2211 rcr
= afu_reset(cfg
);
2214 cfg
->state
= STATE_FAILTERM
;
2216 cfg
->state
= STATE_NORMAL
;
2217 wake_up_all(&cfg
->reset_waitq
);
2221 wait_event(cfg
->reset_waitq
, cfg
->state
!= STATE_RESET
);
2222 if (cfg
->state
== STATE_NORMAL
)
2230 dev_dbg(dev
, "%s: returning rc=%d\n", __func__
, rc
);
2235 * cxlflash_change_queue_depth() - change the queue depth for the device
2236 * @sdev: SCSI device destined for queue depth change.
2237 * @qdepth: Requested queue depth value to set.
2239 * The requested queue depth is capped to the maximum supported value.
2241 * Return: The actual queue depth set.
2243 static int cxlflash_change_queue_depth(struct scsi_device
*sdev
, int qdepth
)
2246 if (qdepth
> CXLFLASH_MAX_CMDS_PER_LUN
)
2247 qdepth
= CXLFLASH_MAX_CMDS_PER_LUN
;
2249 scsi_change_queue_depth(sdev
, qdepth
);
2250 return sdev
->queue_depth
;
2254 * cxlflash_show_port_status() - queries and presents the current port status
2255 * @port: Desired port for status reporting.
2256 * @cfg: Internal structure associated with the host.
2257 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
2259 * Return: The size of the ASCII string returned in @buf or -EINVAL.
2261 static ssize_t
cxlflash_show_port_status(u32 port
,
2262 struct cxlflash_cfg
*cfg
,
2265 struct device
*dev
= &cfg
->dev
->dev
;
2268 __be64 __iomem
*fc_port_regs
;
2270 WARN_ON(port
>= MAX_FC_PORTS
);
2272 if (port
>= cfg
->num_fc_ports
) {
2273 dev_info(dev
, "%s: Port %d not supported on this card.\n",
2278 fc_port_regs
= get_fc_port_regs(cfg
, port
);
2279 status
= readq_be(&fc_port_regs
[FC_MTIP_STATUS
/ 8]);
2280 status
&= FC_MTIP_STATUS_MASK
;
2282 if (status
== FC_MTIP_STATUS_ONLINE
)
2283 disp_status
= "online";
2284 else if (status
== FC_MTIP_STATUS_OFFLINE
)
2285 disp_status
= "offline";
2287 disp_status
= "unknown";
2289 return scnprintf(buf
, PAGE_SIZE
, "%s\n", disp_status
);
2293 * port0_show() - queries and presents the current status of port 0
2294 * @dev: Generic device associated with the host owning the port.
2295 * @attr: Device attribute representing the port.
2296 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
2298 * Return: The size of the ASCII string returned in @buf.
2300 static ssize_t
port0_show(struct device
*dev
,
2301 struct device_attribute
*attr
,
2304 struct cxlflash_cfg
*cfg
= shost_priv(class_to_shost(dev
));
2306 return cxlflash_show_port_status(0, cfg
, buf
);
2310 * port1_show() - queries and presents the current status of port 1
2311 * @dev: Generic device associated with the host owning the port.
2312 * @attr: Device attribute representing the port.
2313 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
2315 * Return: The size of the ASCII string returned in @buf.
2317 static ssize_t
port1_show(struct device
*dev
,
2318 struct device_attribute
*attr
,
2321 struct cxlflash_cfg
*cfg
= shost_priv(class_to_shost(dev
));
2323 return cxlflash_show_port_status(1, cfg
, buf
);
2327 * port2_show() - queries and presents the current status of port 2
2328 * @dev: Generic device associated with the host owning the port.
2329 * @attr: Device attribute representing the port.
2330 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
2332 * Return: The size of the ASCII string returned in @buf.
2334 static ssize_t
port2_show(struct device
*dev
,
2335 struct device_attribute
*attr
,
2338 struct cxlflash_cfg
*cfg
= shost_priv(class_to_shost(dev
));
2340 return cxlflash_show_port_status(2, cfg
, buf
);
2344 * port3_show() - queries and presents the current status of port 3
2345 * @dev: Generic device associated with the host owning the port.
2346 * @attr: Device attribute representing the port.
2347 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
2349 * Return: The size of the ASCII string returned in @buf.
2351 static ssize_t
port3_show(struct device
*dev
,
2352 struct device_attribute
*attr
,
2355 struct cxlflash_cfg
*cfg
= shost_priv(class_to_shost(dev
));
2357 return cxlflash_show_port_status(3, cfg
, buf
);
2361 * lun_mode_show() - presents the current LUN mode of the host
2362 * @dev: Generic device associated with the host.
2363 * @attr: Device attribute representing the LUN mode.
2364 * @buf: Buffer of length PAGE_SIZE to report back the LUN mode in ASCII.
2366 * Return: The size of the ASCII string returned in @buf.
2368 static ssize_t
lun_mode_show(struct device
*dev
,
2369 struct device_attribute
*attr
, char *buf
)
2371 struct cxlflash_cfg
*cfg
= shost_priv(class_to_shost(dev
));
2372 struct afu
*afu
= cfg
->afu
;
2374 return scnprintf(buf
, PAGE_SIZE
, "%u\n", afu
->internal_lun
);
2378 * lun_mode_store() - sets the LUN mode of the host
2379 * @dev: Generic device associated with the host.
2380 * @attr: Device attribute representing the LUN mode.
2381 * @buf: Buffer of length PAGE_SIZE containing the LUN mode in ASCII.
2382 * @count: Length of data resizing in @buf.
2384 * The CXL Flash AFU supports a dummy LUN mode where the external
2385 * links and storage are not required. Space on the FPGA is used
2386 * to create 1 or 2 small LUNs which are presented to the system
2387 * as if they were a normal storage device. This feature is useful
2388 * during development and also provides manufacturing with a way
2389 * to test the AFU without an actual device.
2391 * 0 = external LUN[s] (default)
2392 * 1 = internal LUN (1 x 64K, 512B blocks, id 0)
2393 * 2 = internal LUN (1 x 64K, 4K blocks, id 0)
2394 * 3 = internal LUN (2 x 32K, 512B blocks, ids 0,1)
2395 * 4 = internal LUN (2 x 32K, 4K blocks, ids 0,1)
2397 * Return: The size of the ASCII string returned in @buf.
2399 static ssize_t
lun_mode_store(struct device
*dev
,
2400 struct device_attribute
*attr
,
2401 const char *buf
, size_t count
)
2403 struct Scsi_Host
*shost
= class_to_shost(dev
);
2404 struct cxlflash_cfg
*cfg
= shost_priv(shost
);
2405 struct afu
*afu
= cfg
->afu
;
2409 rc
= kstrtouint(buf
, 10, &lun_mode
);
2410 if (!rc
&& (lun_mode
< 5) && (lun_mode
!= afu
->internal_lun
)) {
2411 afu
->internal_lun
= lun_mode
;
2414 * When configured for internal LUN, there is only one channel,
2415 * channel number 0, else there will be one less than the number
2416 * of fc ports for this card.
2418 if (afu
->internal_lun
)
2419 shost
->max_channel
= 0;
2421 shost
->max_channel
= PORTNUM2CHAN(cfg
->num_fc_ports
);
2424 scsi_scan_host(cfg
->host
);
2431 * ioctl_version_show() - presents the current ioctl version of the host
2432 * @dev: Generic device associated with the host.
2433 * @attr: Device attribute representing the ioctl version.
2434 * @buf: Buffer of length PAGE_SIZE to report back the ioctl version.
2436 * Return: The size of the ASCII string returned in @buf.
2438 static ssize_t
ioctl_version_show(struct device
*dev
,
2439 struct device_attribute
*attr
, char *buf
)
2441 return scnprintf(buf
, PAGE_SIZE
, "%u\n", DK_CXLFLASH_VERSION_0
);
2445 * cxlflash_show_port_lun_table() - queries and presents the port LUN table
2446 * @port: Desired port for status reporting.
2447 * @cfg: Internal structure associated with the host.
2448 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
2450 * Return: The size of the ASCII string returned in @buf or -EINVAL.
2452 static ssize_t
cxlflash_show_port_lun_table(u32 port
,
2453 struct cxlflash_cfg
*cfg
,
2456 struct device
*dev
= &cfg
->dev
->dev
;
2457 __be64 __iomem
*fc_port_luns
;
2461 WARN_ON(port
>= MAX_FC_PORTS
);
2463 if (port
>= cfg
->num_fc_ports
) {
2464 dev_info(dev
, "%s: Port %d not supported on this card.\n",
2469 fc_port_luns
= get_fc_port_luns(cfg
, port
);
2471 for (i
= 0; i
< CXLFLASH_NUM_VLUNS
; i
++)
2472 bytes
+= scnprintf(buf
+ bytes
, PAGE_SIZE
- bytes
,
2474 i
, readq_be(&fc_port_luns
[i
]));
2479 * port0_lun_table_show() - presents the current LUN table of port 0
2480 * @dev: Generic device associated with the host owning the port.
2481 * @attr: Device attribute representing the port.
2482 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
2484 * Return: The size of the ASCII string returned in @buf.
2486 static ssize_t
port0_lun_table_show(struct device
*dev
,
2487 struct device_attribute
*attr
,
2490 struct cxlflash_cfg
*cfg
= shost_priv(class_to_shost(dev
));
2492 return cxlflash_show_port_lun_table(0, cfg
, buf
);
2496 * port1_lun_table_show() - presents the current LUN table of port 1
2497 * @dev: Generic device associated with the host owning the port.
2498 * @attr: Device attribute representing the port.
2499 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
2501 * Return: The size of the ASCII string returned in @buf.
2503 static ssize_t
port1_lun_table_show(struct device
*dev
,
2504 struct device_attribute
*attr
,
2507 struct cxlflash_cfg
*cfg
= shost_priv(class_to_shost(dev
));
2509 return cxlflash_show_port_lun_table(1, cfg
, buf
);
2513 * port2_lun_table_show() - presents the current LUN table of port 2
2514 * @dev: Generic device associated with the host owning the port.
2515 * @attr: Device attribute representing the port.
2516 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
2518 * Return: The size of the ASCII string returned in @buf.
2520 static ssize_t
port2_lun_table_show(struct device
*dev
,
2521 struct device_attribute
*attr
,
2524 struct cxlflash_cfg
*cfg
= shost_priv(class_to_shost(dev
));
2526 return cxlflash_show_port_lun_table(2, cfg
, buf
);
2530 * port3_lun_table_show() - presents the current LUN table of port 3
2531 * @dev: Generic device associated with the host owning the port.
2532 * @attr: Device attribute representing the port.
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.
2537 static ssize_t
port3_lun_table_show(struct device
*dev
,
2538 struct device_attribute
*attr
,
2541 struct cxlflash_cfg
*cfg
= shost_priv(class_to_shost(dev
));
2543 return cxlflash_show_port_lun_table(3, cfg
, buf
);
2547 * irqpoll_weight_show() - presents the current IRQ poll weight for the host
2548 * @dev: Generic device associated with the host.
2549 * @attr: Device attribute representing the IRQ poll weight.
2550 * @buf: Buffer of length PAGE_SIZE to report back the current IRQ poll
2553 * An IRQ poll weight of 0 indicates polling is disabled.
2555 * Return: The size of the ASCII string returned in @buf.
2557 static ssize_t
irqpoll_weight_show(struct device
*dev
,
2558 struct device_attribute
*attr
, char *buf
)
2560 struct cxlflash_cfg
*cfg
= shost_priv(class_to_shost(dev
));
2561 struct afu
*afu
= cfg
->afu
;
2563 return scnprintf(buf
, PAGE_SIZE
, "%u\n", afu
->irqpoll_weight
);
2567 * irqpoll_weight_store() - sets the current IRQ poll weight for the host
2568 * @dev: Generic device associated with the host.
2569 * @attr: Device attribute representing the IRQ poll weight.
2570 * @buf: Buffer of length PAGE_SIZE containing the desired IRQ poll
2572 * @count: Length of data resizing in @buf.
2574 * An IRQ poll weight of 0 indicates polling is disabled.
2576 * Return: The size of the ASCII string returned in @buf.
2578 static ssize_t
irqpoll_weight_store(struct device
*dev
,
2579 struct device_attribute
*attr
,
2580 const char *buf
, size_t count
)
2582 struct cxlflash_cfg
*cfg
= shost_priv(class_to_shost(dev
));
2583 struct device
*cfgdev
= &cfg
->dev
->dev
;
2584 struct afu
*afu
= cfg
->afu
;
2589 rc
= kstrtouint(buf
, 10, &weight
);
2595 "Invalid IRQ poll weight. It must be 256 or less.\n");
2599 if (weight
== afu
->irqpoll_weight
) {
2601 "Current IRQ poll weight has the same weight.\n");
2605 if (afu_is_irqpoll_enabled(afu
)) {
2606 for (i
= 0; i
< afu
->num_hwqs
; i
++) {
2607 hwq
= get_hwq(afu
, i
);
2609 irq_poll_disable(&hwq
->irqpoll
);
2613 afu
->irqpoll_weight
= weight
;
2616 for (i
= 0; i
< afu
->num_hwqs
; i
++) {
2617 hwq
= get_hwq(afu
, i
);
2619 irq_poll_init(&hwq
->irqpoll
, weight
, cxlflash_irqpoll
);
2627 * num_hwqs_show() - presents the number of hardware queues for the host
2628 * @dev: Generic device associated with the host.
2629 * @attr: Device attribute representing the number of hardware queues.
2630 * @buf: Buffer of length PAGE_SIZE to report back the number of hardware
2633 * Return: The size of the ASCII string returned in @buf.
2635 static ssize_t
num_hwqs_show(struct device
*dev
,
2636 struct device_attribute
*attr
, char *buf
)
2638 struct cxlflash_cfg
*cfg
= shost_priv(class_to_shost(dev
));
2639 struct afu
*afu
= cfg
->afu
;
2641 return scnprintf(buf
, PAGE_SIZE
, "%u\n", afu
->num_hwqs
);
2645 * num_hwqs_store() - sets the number of hardware queues for the host
2646 * @dev: Generic device associated with the host.
2647 * @attr: Device attribute representing the number of hardware queues.
2648 * @buf: Buffer of length PAGE_SIZE containing the number of hardware
2650 * @count: Length of data resizing in @buf.
2652 * n > 0: num_hwqs = n
2653 * n = 0: num_hwqs = num_online_cpus()
2654 * n < 0: num_online_cpus() / abs(n)
2656 * Return: The size of the ASCII string returned in @buf.
2658 static ssize_t
num_hwqs_store(struct device
*dev
,
2659 struct device_attribute
*attr
,
2660 const char *buf
, size_t count
)
2662 struct cxlflash_cfg
*cfg
= shost_priv(class_to_shost(dev
));
2663 struct afu
*afu
= cfg
->afu
;
2665 int nhwqs
, num_hwqs
;
2667 rc
= kstrtoint(buf
, 10, &nhwqs
);
2673 else if (nhwqs
== 0)
2674 num_hwqs
= num_online_cpus();
2676 num_hwqs
= num_online_cpus() / abs(nhwqs
);
2678 afu
->desired_hwqs
= min(num_hwqs
, CXLFLASH_MAX_HWQS
);
2679 WARN_ON_ONCE(afu
->desired_hwqs
== 0);
2682 switch (cfg
->state
) {
2684 cfg
->state
= STATE_RESET
;
2686 cxlflash_mark_contexts_error(cfg
);
2687 rc
= afu_reset(cfg
);
2689 cfg
->state
= STATE_FAILTERM
;
2691 cfg
->state
= STATE_NORMAL
;
2692 wake_up_all(&cfg
->reset_waitq
);
2695 wait_event(cfg
->reset_waitq
, cfg
->state
!= STATE_RESET
);
2696 if (cfg
->state
== STATE_NORMAL
)
2699 /* Ideally should not happen */
2700 dev_err(dev
, "%s: Device is not ready, state=%d\n",
2701 __func__
, cfg
->state
);
2708 static const char *hwq_mode_name
[MAX_HWQ_MODE
] = { "rr", "tag", "cpu" };
2711 * hwq_mode_show() - presents the HWQ steering mode for the host
2712 * @dev: Generic device associated with the host.
2713 * @attr: Device attribute representing the HWQ steering mode.
2714 * @buf: Buffer of length PAGE_SIZE to report back the HWQ steering mode
2715 * as a character string.
2717 * Return: The size of the ASCII string returned in @buf.
2719 static ssize_t
hwq_mode_show(struct device
*dev
,
2720 struct device_attribute
*attr
, char *buf
)
2722 struct cxlflash_cfg
*cfg
= shost_priv(class_to_shost(dev
));
2723 struct afu
*afu
= cfg
->afu
;
2725 return scnprintf(buf
, PAGE_SIZE
, "%s\n", hwq_mode_name
[afu
->hwq_mode
]);
2729 * hwq_mode_store() - sets the HWQ steering mode for the host
2730 * @dev: Generic device associated with the host.
2731 * @attr: Device attribute representing the HWQ steering mode.
2732 * @buf: Buffer of length PAGE_SIZE containing the HWQ steering mode
2733 * as a character string.
2734 * @count: Length of data resizing in @buf.
2737 * tag = Block MQ Tagging
2738 * cpu = CPU Affinity
2740 * Return: The size of the ASCII string returned in @buf.
2742 static ssize_t
hwq_mode_store(struct device
*dev
,
2743 struct device_attribute
*attr
,
2744 const char *buf
, size_t count
)
2746 struct Scsi_Host
*shost
= class_to_shost(dev
);
2747 struct cxlflash_cfg
*cfg
= shost_priv(shost
);
2748 struct device
*cfgdev
= &cfg
->dev
->dev
;
2749 struct afu
*afu
= cfg
->afu
;
2751 u32 mode
= MAX_HWQ_MODE
;
2753 for (i
= 0; i
< MAX_HWQ_MODE
; i
++) {
2754 if (!strncmp(hwq_mode_name
[i
], buf
, strlen(hwq_mode_name
[i
]))) {
2760 if (mode
>= MAX_HWQ_MODE
) {
2761 dev_info(cfgdev
, "Invalid HWQ steering mode.\n");
2765 if ((mode
== HWQ_MODE_TAG
) && !shost_use_blk_mq(shost
)) {
2766 dev_info(cfgdev
, "SCSI-MQ is not enabled, use a different "
2767 "HWQ steering mode.\n");
2771 afu
->hwq_mode
= mode
;
2777 * mode_show() - presents the current mode of the device
2778 * @dev: Generic device associated with the device.
2779 * @attr: Device attribute representing the device mode.
2780 * @buf: Buffer of length PAGE_SIZE to report back the dev mode in ASCII.
2782 * Return: The size of the ASCII string returned in @buf.
2784 static ssize_t
mode_show(struct device
*dev
,
2785 struct device_attribute
*attr
, char *buf
)
2787 struct scsi_device
*sdev
= to_scsi_device(dev
);
2789 return scnprintf(buf
, PAGE_SIZE
, "%s\n",
2790 sdev
->hostdata
? "superpipe" : "legacy");
2796 static DEVICE_ATTR_RO(port0
);
2797 static DEVICE_ATTR_RO(port1
);
2798 static DEVICE_ATTR_RO(port2
);
2799 static DEVICE_ATTR_RO(port3
);
2800 static DEVICE_ATTR_RW(lun_mode
);
2801 static DEVICE_ATTR_RO(ioctl_version
);
2802 static DEVICE_ATTR_RO(port0_lun_table
);
2803 static DEVICE_ATTR_RO(port1_lun_table
);
2804 static DEVICE_ATTR_RO(port2_lun_table
);
2805 static DEVICE_ATTR_RO(port3_lun_table
);
2806 static DEVICE_ATTR_RW(irqpoll_weight
);
2807 static DEVICE_ATTR_RW(num_hwqs
);
2808 static DEVICE_ATTR_RW(hwq_mode
);
2810 static struct device_attribute
*cxlflash_host_attrs
[] = {
2816 &dev_attr_ioctl_version
,
2817 &dev_attr_port0_lun_table
,
2818 &dev_attr_port1_lun_table
,
2819 &dev_attr_port2_lun_table
,
2820 &dev_attr_port3_lun_table
,
2821 &dev_attr_irqpoll_weight
,
2830 static DEVICE_ATTR_RO(mode
);
2832 static struct device_attribute
*cxlflash_dev_attrs
[] = {
2840 static struct scsi_host_template driver_template
= {
2841 .module
= THIS_MODULE
,
2842 .name
= CXLFLASH_ADAPTER_NAME
,
2843 .info
= cxlflash_driver_info
,
2844 .ioctl
= cxlflash_ioctl
,
2845 .proc_name
= CXLFLASH_NAME
,
2846 .queuecommand
= cxlflash_queuecommand
,
2847 .eh_device_reset_handler
= cxlflash_eh_device_reset_handler
,
2848 .eh_host_reset_handler
= cxlflash_eh_host_reset_handler
,
2849 .change_queue_depth
= cxlflash_change_queue_depth
,
2850 .cmd_per_lun
= CXLFLASH_MAX_CMDS_PER_LUN
,
2851 .can_queue
= CXLFLASH_MAX_CMDS
,
2852 .cmd_size
= sizeof(struct afu_cmd
) + __alignof__(struct afu_cmd
) - 1,
2854 .sg_tablesize
= 1, /* No scatter gather support */
2855 .max_sectors
= CXLFLASH_MAX_SECTORS
,
2856 .use_clustering
= ENABLE_CLUSTERING
,
2857 .shost_attrs
= cxlflash_host_attrs
,
2858 .sdev_attrs
= cxlflash_dev_attrs
,
2862 * Device dependent values
2864 static struct dev_dependent_vals dev_corsa_vals
= { CXLFLASH_MAX_SECTORS
,
2866 static struct dev_dependent_vals dev_flash_gt_vals
= { CXLFLASH_MAX_SECTORS
,
2867 CXLFLASH_NOTIFY_SHUTDOWN
};
2868 static struct dev_dependent_vals dev_briard_vals
= { CXLFLASH_MAX_SECTORS
,
2869 CXLFLASH_NOTIFY_SHUTDOWN
};
2872 * PCI device binding table
2874 static struct pci_device_id cxlflash_pci_table
[] = {
2875 {PCI_VENDOR_ID_IBM
, PCI_DEVICE_ID_IBM_CORSA
,
2876 PCI_ANY_ID
, PCI_ANY_ID
, 0, 0, (kernel_ulong_t
)&dev_corsa_vals
},
2877 {PCI_VENDOR_ID_IBM
, PCI_DEVICE_ID_IBM_FLASH_GT
,
2878 PCI_ANY_ID
, PCI_ANY_ID
, 0, 0, (kernel_ulong_t
)&dev_flash_gt_vals
},
2879 {PCI_VENDOR_ID_IBM
, PCI_DEVICE_ID_IBM_BRIARD
,
2880 PCI_ANY_ID
, PCI_ANY_ID
, 0, 0, (kernel_ulong_t
)&dev_briard_vals
},
2884 MODULE_DEVICE_TABLE(pci
, cxlflash_pci_table
);
2887 * cxlflash_worker_thread() - work thread handler for the AFU
2888 * @work: Work structure contained within cxlflash associated with host.
2890 * Handles the following events:
2891 * - Link reset which cannot be performed on interrupt context due to
2892 * blocking up to a few seconds
2895 static void cxlflash_worker_thread(struct work_struct
*work
)
2897 struct cxlflash_cfg
*cfg
= container_of(work
, struct cxlflash_cfg
,
2899 struct afu
*afu
= cfg
->afu
;
2900 struct device
*dev
= &cfg
->dev
->dev
;
2901 __be64 __iomem
*fc_port_regs
;
2905 /* Avoid MMIO if the device has failed */
2907 if (cfg
->state
!= STATE_NORMAL
)
2910 spin_lock_irqsave(cfg
->host
->host_lock
, lock_flags
);
2912 if (cfg
->lr_state
== LINK_RESET_REQUIRED
) {
2913 port
= cfg
->lr_port
;
2915 dev_err(dev
, "%s: invalid port index %d\n",
2918 spin_unlock_irqrestore(cfg
->host
->host_lock
,
2921 /* The reset can block... */
2922 fc_port_regs
= get_fc_port_regs(cfg
, port
);
2923 afu_link_reset(afu
, port
, fc_port_regs
);
2924 spin_lock_irqsave(cfg
->host
->host_lock
, lock_flags
);
2927 cfg
->lr_state
= LINK_RESET_COMPLETE
;
2930 spin_unlock_irqrestore(cfg
->host
->host_lock
, lock_flags
);
2932 if (atomic_dec_if_positive(&cfg
->scan_host_needed
) >= 0)
2933 scsi_scan_host(cfg
->host
);
2937 * cxlflash_probe() - PCI entry point to add host
2938 * @pdev: PCI device associated with the host.
2939 * @dev_id: PCI device id associated with device.
2941 * The device will initially start out in a 'probing' state and
2942 * transition to the 'normal' state at the end of a successful
2943 * probe. Should an EEH event occur during probe, the notification
2944 * thread (error_detected()) will wait until the probe handler
2945 * is nearly complete. At that time, the device will be moved to
2946 * a 'probed' state and the EEH thread woken up to drive the slot
2947 * reset and recovery (device moves to 'normal' state). Meanwhile,
2948 * the probe will be allowed to exit successfully.
2950 * Return: 0 on success, -errno on failure
2952 static int cxlflash_probe(struct pci_dev
*pdev
,
2953 const struct pci_device_id
*dev_id
)
2955 struct Scsi_Host
*host
;
2956 struct cxlflash_cfg
*cfg
= NULL
;
2957 struct device
*dev
= &pdev
->dev
;
2958 struct dev_dependent_vals
*ddv
;
2962 dev_dbg(&pdev
->dev
, "%s: Found CXLFLASH with IRQ: %d\n",
2963 __func__
, pdev
->irq
);
2965 ddv
= (struct dev_dependent_vals
*)dev_id
->driver_data
;
2966 driver_template
.max_sectors
= ddv
->max_sectors
;
2968 host
= scsi_host_alloc(&driver_template
, sizeof(struct cxlflash_cfg
));
2970 dev_err(dev
, "%s: scsi_host_alloc failed\n", __func__
);
2975 host
->max_id
= CXLFLASH_MAX_NUM_TARGETS_PER_BUS
;
2976 host
->max_lun
= CXLFLASH_MAX_NUM_LUNS_PER_TARGET
;
2977 host
->unique_id
= host
->host_no
;
2978 host
->max_cmd_len
= CXLFLASH_MAX_CDB_LEN
;
2980 cfg
= shost_priv(host
);
2982 rc
= alloc_mem(cfg
);
2984 dev_err(dev
, "%s: alloc_mem failed\n", __func__
);
2986 scsi_host_put(cfg
->host
);
2990 cfg
->init_state
= INIT_STATE_NONE
;
2992 cfg
->cxl_fops
= cxlflash_cxl_fops
;
2995 * Promoted LUNs move to the top of the LUN table. The rest stay on
2996 * the bottom half. The bottom half grows from the end (index = 255),
2997 * whereas the top half grows from the beginning (index = 0).
2999 * Initialize the last LUN index for all possible ports.
3001 cfg
->promote_lun_index
= 0;
3003 for (k
= 0; k
< MAX_FC_PORTS
; k
++)
3004 cfg
->last_lun_index
[k
] = CXLFLASH_NUM_VLUNS
/2 - 1;
3006 cfg
->dev_id
= (struct pci_device_id
*)dev_id
;
3008 init_waitqueue_head(&cfg
->tmf_waitq
);
3009 init_waitqueue_head(&cfg
->reset_waitq
);
3011 INIT_WORK(&cfg
->work_q
, cxlflash_worker_thread
);
3012 cfg
->lr_state
= LINK_RESET_INVALID
;
3014 spin_lock_init(&cfg
->tmf_slock
);
3015 mutex_init(&cfg
->ctx_tbl_list_mutex
);
3016 mutex_init(&cfg
->ctx_recovery_mutex
);
3017 init_rwsem(&cfg
->ioctl_rwsem
);
3018 INIT_LIST_HEAD(&cfg
->ctx_err_recovery
);
3019 INIT_LIST_HEAD(&cfg
->lluns
);
3021 pci_set_drvdata(pdev
, cfg
);
3023 cfg
->cxl_afu
= cxl_pci_to_afu(pdev
);
3027 dev_err(dev
, "%s: init_pci failed rc=%d\n", __func__
, rc
);
3030 cfg
->init_state
= INIT_STATE_PCI
;
3033 if (rc
&& !wq_has_sleeper(&cfg
->reset_waitq
)) {
3034 dev_err(dev
, "%s: init_afu failed rc=%d\n", __func__
, rc
);
3037 cfg
->init_state
= INIT_STATE_AFU
;
3039 rc
= init_scsi(cfg
);
3041 dev_err(dev
, "%s: init_scsi failed rc=%d\n", __func__
, rc
);
3044 cfg
->init_state
= INIT_STATE_SCSI
;
3046 if (wq_has_sleeper(&cfg
->reset_waitq
)) {
3047 cfg
->state
= STATE_PROBED
;
3048 wake_up_all(&cfg
->reset_waitq
);
3050 cfg
->state
= STATE_NORMAL
;
3052 dev_dbg(dev
, "%s: returning rc=%d\n", __func__
, rc
);
3056 cxlflash_remove(pdev
);
3061 * cxlflash_pci_error_detected() - called when a PCI error is detected
3062 * @pdev: PCI device struct.
3063 * @state: PCI channel state.
3065 * When an EEH occurs during an active reset, wait until the reset is
3066 * complete and then take action based upon the device state.
3068 * Return: PCI_ERS_RESULT_NEED_RESET or PCI_ERS_RESULT_DISCONNECT
3070 static pci_ers_result_t
cxlflash_pci_error_detected(struct pci_dev
*pdev
,
3071 pci_channel_state_t state
)
3074 struct cxlflash_cfg
*cfg
= pci_get_drvdata(pdev
);
3075 struct device
*dev
= &cfg
->dev
->dev
;
3077 dev_dbg(dev
, "%s: pdev=%p state=%u\n", __func__
, pdev
, state
);
3080 case pci_channel_io_frozen
:
3081 wait_event(cfg
->reset_waitq
, cfg
->state
!= STATE_RESET
&&
3082 cfg
->state
!= STATE_PROBING
);
3083 if (cfg
->state
== STATE_FAILTERM
)
3084 return PCI_ERS_RESULT_DISCONNECT
;
3086 cfg
->state
= STATE_RESET
;
3087 scsi_block_requests(cfg
->host
);
3089 rc
= cxlflash_mark_contexts_error(cfg
);
3091 dev_err(dev
, "%s: Failed to mark user contexts rc=%d\n",
3094 return PCI_ERS_RESULT_NEED_RESET
;
3095 case pci_channel_io_perm_failure
:
3096 cfg
->state
= STATE_FAILTERM
;
3097 wake_up_all(&cfg
->reset_waitq
);
3098 scsi_unblock_requests(cfg
->host
);
3099 return PCI_ERS_RESULT_DISCONNECT
;
3103 return PCI_ERS_RESULT_NEED_RESET
;
3107 * cxlflash_pci_slot_reset() - called when PCI slot has been reset
3108 * @pdev: PCI device struct.
3110 * This routine is called by the pci error recovery code after the PCI
3111 * slot has been reset, just before we should resume normal operations.
3113 * Return: PCI_ERS_RESULT_RECOVERED or PCI_ERS_RESULT_DISCONNECT
3115 static pci_ers_result_t
cxlflash_pci_slot_reset(struct pci_dev
*pdev
)
3118 struct cxlflash_cfg
*cfg
= pci_get_drvdata(pdev
);
3119 struct device
*dev
= &cfg
->dev
->dev
;
3121 dev_dbg(dev
, "%s: pdev=%p\n", __func__
, pdev
);
3125 dev_err(dev
, "%s: EEH recovery failed rc=%d\n", __func__
, rc
);
3126 return PCI_ERS_RESULT_DISCONNECT
;
3129 return PCI_ERS_RESULT_RECOVERED
;
3133 * cxlflash_pci_resume() - called when normal operation can resume
3134 * @pdev: PCI device struct
3136 static void cxlflash_pci_resume(struct pci_dev
*pdev
)
3138 struct cxlflash_cfg
*cfg
= pci_get_drvdata(pdev
);
3139 struct device
*dev
= &cfg
->dev
->dev
;
3141 dev_dbg(dev
, "%s: pdev=%p\n", __func__
, pdev
);
3143 cfg
->state
= STATE_NORMAL
;
3144 wake_up_all(&cfg
->reset_waitq
);
3145 scsi_unblock_requests(cfg
->host
);
3148 static const struct pci_error_handlers cxlflash_err_handler
= {
3149 .error_detected
= cxlflash_pci_error_detected
,
3150 .slot_reset
= cxlflash_pci_slot_reset
,
3151 .resume
= cxlflash_pci_resume
,
3155 * PCI device structure
3157 static struct pci_driver cxlflash_driver
= {
3158 .name
= CXLFLASH_NAME
,
3159 .id_table
= cxlflash_pci_table
,
3160 .probe
= cxlflash_probe
,
3161 .remove
= cxlflash_remove
,
3162 .shutdown
= cxlflash_remove
,
3163 .err_handler
= &cxlflash_err_handler
,
3167 * init_cxlflash() - module entry point
3169 * Return: 0 on success, -errno on failure
3171 static int __init
init_cxlflash(void)
3174 cxlflash_list_init();
3176 return pci_register_driver(&cxlflash_driver
);
3180 * exit_cxlflash() - module exit point
3182 static void __exit
exit_cxlflash(void)
3184 cxlflash_term_global_luns();
3185 cxlflash_free_errpage();
3187 pci_unregister_driver(&cxlflash_driver
);
3190 module_init(init_cxlflash
);
3191 module_exit(exit_cxlflash
);