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 command owner context via specified register
193 * @cmd: AFU command that timed out.
194 * @reset_reg: MMIO register to perform reset.
196 static void context_reset(struct afu_cmd
*cmd
, __be64 __iomem
*reset_reg
)
200 struct afu
*afu
= cmd
->parent
;
201 struct cxlflash_cfg
*cfg
= afu
->parent
;
202 struct device
*dev
= &cfg
->dev
->dev
;
204 dev_dbg(dev
, "%s: cmd=%p\n", __func__
, cmd
);
206 writeq_be(rrin
, reset_reg
);
208 rrin
= readq_be(reset_reg
);
211 /* Double delay each time */
213 } while (nretry
++ < MC_ROOM_RETRY_CNT
);
215 dev_dbg(dev
, "%s: returning rrin=%016llx nretry=%d\n",
216 __func__
, rrin
, nretry
);
220 * context_reset_ioarrin() - reset command owner context via IOARRIN register
221 * @cmd: AFU command that timed out.
223 static void context_reset_ioarrin(struct afu_cmd
*cmd
)
225 struct afu
*afu
= cmd
->parent
;
226 struct hwq
*hwq
= get_hwq(afu
, cmd
->hwq_index
);
228 context_reset(cmd
, &hwq
->host_map
->ioarrin
);
232 * context_reset_sq() - reset command owner context w/ SQ Context Reset register
233 * @cmd: AFU command that timed out.
235 static void context_reset_sq(struct afu_cmd
*cmd
)
237 struct afu
*afu
= cmd
->parent
;
238 struct hwq
*hwq
= get_hwq(afu
, cmd
->hwq_index
);
240 context_reset(cmd
, &hwq
->host_map
->sq_ctx_reset
);
244 * send_cmd_ioarrin() - sends an AFU command via IOARRIN register
245 * @afu: AFU associated with the host.
246 * @cmd: AFU command to send.
249 * 0 on success, SCSI_MLQUEUE_HOST_BUSY on failure
251 static int send_cmd_ioarrin(struct afu
*afu
, struct afu_cmd
*cmd
)
253 struct cxlflash_cfg
*cfg
= afu
->parent
;
254 struct device
*dev
= &cfg
->dev
->dev
;
255 struct hwq
*hwq
= get_hwq(afu
, cmd
->hwq_index
);
261 * To avoid the performance penalty of MMIO, spread the update of
262 * 'room' over multiple commands.
264 spin_lock_irqsave(&hwq
->rrin_slock
, lock_flags
);
265 if (--hwq
->room
< 0) {
266 room
= readq_be(&hwq
->host_map
->cmd_room
);
268 dev_dbg_ratelimited(dev
, "%s: no cmd_room to send "
269 "0x%02X, room=0x%016llX\n",
270 __func__
, cmd
->rcb
.cdb
[0], room
);
272 rc
= SCSI_MLQUEUE_HOST_BUSY
;
275 hwq
->room
= room
- 1;
278 writeq_be((u64
)&cmd
->rcb
, &hwq
->host_map
->ioarrin
);
280 spin_unlock_irqrestore(&hwq
->rrin_slock
, lock_flags
);
281 dev_dbg(dev
, "%s: cmd=%p len=%u ea=%016llx rc=%d\n", __func__
,
282 cmd
, cmd
->rcb
.data_len
, cmd
->rcb
.data_ea
, rc
);
287 * send_cmd_sq() - sends an AFU command via SQ ring
288 * @afu: AFU associated with the host.
289 * @cmd: AFU command to send.
292 * 0 on success, SCSI_MLQUEUE_HOST_BUSY on failure
294 static int send_cmd_sq(struct afu
*afu
, struct afu_cmd
*cmd
)
296 struct cxlflash_cfg
*cfg
= afu
->parent
;
297 struct device
*dev
= &cfg
->dev
->dev
;
298 struct hwq
*hwq
= get_hwq(afu
, cmd
->hwq_index
);
303 newval
= atomic_dec_if_positive(&hwq
->hsq_credits
);
305 rc
= SCSI_MLQUEUE_HOST_BUSY
;
309 cmd
->rcb
.ioasa
= &cmd
->sa
;
311 spin_lock_irqsave(&hwq
->hsq_slock
, lock_flags
);
313 *hwq
->hsq_curr
= cmd
->rcb
;
314 if (hwq
->hsq_curr
< hwq
->hsq_end
)
317 hwq
->hsq_curr
= hwq
->hsq_start
;
318 writeq_be((u64
)hwq
->hsq_curr
, &hwq
->host_map
->sq_tail
);
320 spin_unlock_irqrestore(&hwq
->hsq_slock
, lock_flags
);
322 dev_dbg(dev
, "%s: cmd=%p len=%u ea=%016llx ioasa=%p rc=%d curr=%p "
323 "head=%016llx tail=%016llx\n", __func__
, cmd
, cmd
->rcb
.data_len
,
324 cmd
->rcb
.data_ea
, cmd
->rcb
.ioasa
, rc
, hwq
->hsq_curr
,
325 readq_be(&hwq
->host_map
->sq_head
),
326 readq_be(&hwq
->host_map
->sq_tail
));
331 * wait_resp() - polls for a response or timeout to a sent AFU command
332 * @afu: AFU associated with the host.
333 * @cmd: AFU command that was sent.
336 * 0 on success, -1 on timeout/error
338 static int wait_resp(struct afu
*afu
, struct afu_cmd
*cmd
)
340 struct cxlflash_cfg
*cfg
= afu
->parent
;
341 struct device
*dev
= &cfg
->dev
->dev
;
343 ulong timeout
= msecs_to_jiffies(cmd
->rcb
.timeout
* 2 * 1000);
345 timeout
= wait_for_completion_timeout(&cmd
->cevent
, timeout
);
347 afu
->context_reset(cmd
);
351 if (unlikely(cmd
->sa
.ioasc
!= 0)) {
352 dev_err(dev
, "%s: cmd %02x failed, ioasc=%08x\n",
353 __func__
, cmd
->rcb
.cdb
[0], cmd
->sa
.ioasc
);
361 * send_tmf() - sends a Task Management Function (TMF)
362 * @afu: AFU to checkout from.
363 * @scp: SCSI command from stack.
364 * @tmfcmd: TMF command to send.
367 * 0 on success, SCSI_MLQUEUE_HOST_BUSY on failure
369 static int send_tmf(struct afu
*afu
, struct scsi_cmnd
*scp
, u64 tmfcmd
)
371 struct cxlflash_cfg
*cfg
= shost_priv(scp
->device
->host
);
372 struct afu_cmd
*cmd
= sc_to_afucz(scp
);
373 struct device
*dev
= &cfg
->dev
->dev
;
374 struct hwq
*hwq
= get_hwq(afu
, PRIMARY_HWQ
);
379 /* When Task Management Function is active do not send another */
380 spin_lock_irqsave(&cfg
->tmf_slock
, lock_flags
);
382 wait_event_interruptible_lock_irq(cfg
->tmf_waitq
,
385 cfg
->tmf_active
= true;
386 spin_unlock_irqrestore(&cfg
->tmf_slock
, lock_flags
);
391 cmd
->hwq_index
= hwq
->index
;
393 cmd
->rcb
.ctx_id
= hwq
->ctx_hndl
;
394 cmd
->rcb
.msi
= SISL_MSI_RRQ_UPDATED
;
395 cmd
->rcb
.port_sel
= CHAN2PORTMASK(scp
->device
->channel
);
396 cmd
->rcb
.lun_id
= lun_to_lunid(scp
->device
->lun
);
397 cmd
->rcb
.req_flags
= (SISL_REQ_FLAGS_PORT_LUN_ID
|
398 SISL_REQ_FLAGS_SUP_UNDERRUN
|
399 SISL_REQ_FLAGS_TMF_CMD
);
400 memcpy(cmd
->rcb
.cdb
, &tmfcmd
, sizeof(tmfcmd
));
402 rc
= afu
->send_cmd(afu
, cmd
);
404 spin_lock_irqsave(&cfg
->tmf_slock
, lock_flags
);
405 cfg
->tmf_active
= false;
406 spin_unlock_irqrestore(&cfg
->tmf_slock
, lock_flags
);
410 spin_lock_irqsave(&cfg
->tmf_slock
, lock_flags
);
411 to
= msecs_to_jiffies(5000);
412 to
= wait_event_interruptible_lock_irq_timeout(cfg
->tmf_waitq
,
417 cfg
->tmf_active
= false;
418 dev_err(dev
, "%s: TMF timed out\n", __func__
);
421 spin_unlock_irqrestore(&cfg
->tmf_slock
, lock_flags
);
427 * cxlflash_driver_info() - information handler for this host driver
428 * @host: SCSI host associated with device.
430 * Return: A string describing the device.
432 static const char *cxlflash_driver_info(struct Scsi_Host
*host
)
434 return CXLFLASH_ADAPTER_NAME
;
438 * cxlflash_queuecommand() - sends a mid-layer request
439 * @host: SCSI host associated with device.
440 * @scp: SCSI command to send.
442 * Return: 0 on success, SCSI_MLQUEUE_HOST_BUSY on failure
444 static int cxlflash_queuecommand(struct Scsi_Host
*host
, struct scsi_cmnd
*scp
)
446 struct cxlflash_cfg
*cfg
= shost_priv(host
);
447 struct afu
*afu
= cfg
->afu
;
448 struct device
*dev
= &cfg
->dev
->dev
;
449 struct afu_cmd
*cmd
= sc_to_afucz(scp
);
450 struct scatterlist
*sg
= scsi_sglist(scp
);
451 struct hwq
*hwq
= get_hwq(afu
, PRIMARY_HWQ
);
452 u16 req_flags
= SISL_REQ_FLAGS_SUP_UNDERRUN
;
456 dev_dbg_ratelimited(dev
, "%s: (scp=%p) %d/%d/%d/%llu "
457 "cdb=(%08x-%08x-%08x-%08x)\n",
458 __func__
, scp
, host
->host_no
, scp
->device
->channel
,
459 scp
->device
->id
, scp
->device
->lun
,
460 get_unaligned_be32(&((u32
*)scp
->cmnd
)[0]),
461 get_unaligned_be32(&((u32
*)scp
->cmnd
)[1]),
462 get_unaligned_be32(&((u32
*)scp
->cmnd
)[2]),
463 get_unaligned_be32(&((u32
*)scp
->cmnd
)[3]));
466 * If a Task Management Function is active, wait for it to complete
467 * before continuing with regular commands.
469 spin_lock_irqsave(&cfg
->tmf_slock
, lock_flags
);
470 if (cfg
->tmf_active
) {
471 spin_unlock_irqrestore(&cfg
->tmf_slock
, lock_flags
);
472 rc
= SCSI_MLQUEUE_HOST_BUSY
;
475 spin_unlock_irqrestore(&cfg
->tmf_slock
, lock_flags
);
477 switch (cfg
->state
) {
481 dev_dbg_ratelimited(dev
, "%s: device is in reset\n", __func__
);
482 rc
= SCSI_MLQUEUE_HOST_BUSY
;
485 dev_dbg_ratelimited(dev
, "%s: device has failed\n", __func__
);
486 scp
->result
= (DID_NO_CONNECT
<< 16);
495 cmd
->rcb
.data_len
= sg
->length
;
496 cmd
->rcb
.data_ea
= (uintptr_t)sg_virt(sg
);
501 cmd
->hwq_index
= hwq
->index
;
503 cmd
->rcb
.ctx_id
= hwq
->ctx_hndl
;
504 cmd
->rcb
.msi
= SISL_MSI_RRQ_UPDATED
;
505 cmd
->rcb
.port_sel
= CHAN2PORTMASK(scp
->device
->channel
);
506 cmd
->rcb
.lun_id
= lun_to_lunid(scp
->device
->lun
);
508 if (scp
->sc_data_direction
== DMA_TO_DEVICE
)
509 req_flags
|= SISL_REQ_FLAGS_HOST_WRITE
;
511 cmd
->rcb
.req_flags
= req_flags
;
512 memcpy(cmd
->rcb
.cdb
, scp
->cmnd
, sizeof(cmd
->rcb
.cdb
));
514 rc
= afu
->send_cmd(afu
, cmd
);
520 * cxlflash_wait_for_pci_err_recovery() - wait for error recovery during probe
521 * @cfg: Internal structure associated with the host.
523 static void cxlflash_wait_for_pci_err_recovery(struct cxlflash_cfg
*cfg
)
525 struct pci_dev
*pdev
= cfg
->dev
;
527 if (pci_channel_offline(pdev
))
528 wait_event_timeout(cfg
->reset_waitq
,
529 !pci_channel_offline(pdev
),
530 CXLFLASH_PCI_ERROR_RECOVERY_TIMEOUT
);
534 * free_mem() - free memory associated with the AFU
535 * @cfg: Internal structure associated with the host.
537 static void free_mem(struct cxlflash_cfg
*cfg
)
539 struct afu
*afu
= cfg
->afu
;
542 free_pages((ulong
)afu
, get_order(sizeof(struct afu
)));
548 * stop_afu() - stops the AFU command timers and unmaps the MMIO space
549 * @cfg: Internal structure associated with the host.
551 * Safe to call with AFU in a partially allocated/initialized state.
553 * Cancels scheduled worker threads, waits for any active internal AFU
554 * commands to timeout, disables IRQ polling and then unmaps the MMIO space.
556 static void stop_afu(struct cxlflash_cfg
*cfg
)
558 struct afu
*afu
= cfg
->afu
;
562 cancel_work_sync(&cfg
->work_q
);
565 while (atomic_read(&afu
->cmds_active
))
568 if (afu_is_irqpoll_enabled(afu
)) {
569 for (i
= 0; i
< afu
->num_hwqs
; i
++) {
570 hwq
= get_hwq(afu
, i
);
572 irq_poll_disable(&hwq
->irqpoll
);
576 if (likely(afu
->afu_map
)) {
577 cxl_psa_unmap((void __iomem
*)afu
->afu_map
);
584 * term_intr() - disables all AFU interrupts
585 * @cfg: Internal structure associated with the host.
586 * @level: Depth of allocation, where to begin waterfall tear down.
587 * @index: Index of the hardware queue.
589 * Safe to call with AFU/MC in partially allocated/initialized state.
591 static void term_intr(struct cxlflash_cfg
*cfg
, enum undo_level level
,
594 struct afu
*afu
= cfg
->afu
;
595 struct device
*dev
= &cfg
->dev
->dev
;
599 dev_err(dev
, "%s: returning with NULL afu\n", __func__
);
603 hwq
= get_hwq(afu
, index
);
606 dev_err(dev
, "%s: returning with NULL MC\n", __func__
);
612 /* SISL_MSI_ASYNC_ERROR is setup only for the primary HWQ */
613 if (index
== PRIMARY_HWQ
)
614 cxl_unmap_afu_irq(hwq
->ctx
, 3, hwq
);
616 cxl_unmap_afu_irq(hwq
->ctx
, 2, hwq
);
618 cxl_unmap_afu_irq(hwq
->ctx
, 1, hwq
);
620 cxl_free_afu_irqs(hwq
->ctx
);
623 /* No action required */
629 * term_mc() - terminates the master context
630 * @cfg: Internal structure associated with the host.
631 * @index: Index of the hardware queue.
633 * Safe to call with AFU/MC in partially allocated/initialized state.
635 static void term_mc(struct cxlflash_cfg
*cfg
, u32 index
)
637 struct afu
*afu
= cfg
->afu
;
638 struct device
*dev
= &cfg
->dev
->dev
;
642 dev_err(dev
, "%s: returning with NULL afu\n", __func__
);
646 hwq
= get_hwq(afu
, index
);
649 dev_err(dev
, "%s: returning with NULL MC\n", __func__
);
653 WARN_ON(cxl_stop_context(hwq
->ctx
));
654 if (index
!= PRIMARY_HWQ
)
655 WARN_ON(cxl_release_context(hwq
->ctx
));
660 * term_afu() - terminates the AFU
661 * @cfg: Internal structure associated with the host.
663 * Safe to call with AFU/MC in partially allocated/initialized state.
665 static void term_afu(struct cxlflash_cfg
*cfg
)
667 struct device
*dev
= &cfg
->dev
->dev
;
671 * Tear down is carefully orchestrated to ensure
672 * no interrupts can come in when the problem state
675 * 1) Disable all AFU interrupts for each master
676 * 2) Unmap the problem state area
677 * 3) Stop each master context
679 for (k
= cfg
->afu
->num_hwqs
- 1; k
>= 0; k
--)
680 term_intr(cfg
, UNMAP_THREE
, k
);
685 for (k
= cfg
->afu
->num_hwqs
- 1; k
>= 0; k
--)
688 dev_dbg(dev
, "%s: returning\n", __func__
);
692 * notify_shutdown() - notifies device of pending shutdown
693 * @cfg: Internal structure associated with the host.
694 * @wait: Whether to wait for shutdown processing to complete.
696 * This function will notify the AFU that the adapter is being shutdown
697 * and will wait for shutdown processing to complete if wait is true.
698 * This notification should flush pending I/Os to the device and halt
699 * further I/Os until the next AFU reset is issued and device restarted.
701 static void notify_shutdown(struct cxlflash_cfg
*cfg
, bool wait
)
703 struct afu
*afu
= cfg
->afu
;
704 struct device
*dev
= &cfg
->dev
->dev
;
705 struct dev_dependent_vals
*ddv
;
706 __be64 __iomem
*fc_port_regs
;
708 int i
, retry_cnt
= 0;
710 ddv
= (struct dev_dependent_vals
*)cfg
->dev_id
->driver_data
;
711 if (!(ddv
->flags
& CXLFLASH_NOTIFY_SHUTDOWN
))
714 if (!afu
|| !afu
->afu_map
) {
715 dev_dbg(dev
, "%s: Problem state area not mapped\n", __func__
);
720 for (i
= 0; i
< cfg
->num_fc_ports
; i
++) {
721 fc_port_regs
= get_fc_port_regs(cfg
, i
);
723 reg
= readq_be(&fc_port_regs
[FC_CONFIG2
/ 8]);
724 reg
|= SISL_FC_SHUTDOWN_NORMAL
;
725 writeq_be(reg
, &fc_port_regs
[FC_CONFIG2
/ 8]);
731 /* Wait up to 1.5 seconds for shutdown processing to complete */
732 for (i
= 0; i
< cfg
->num_fc_ports
; i
++) {
733 fc_port_regs
= get_fc_port_regs(cfg
, i
);
737 status
= readq_be(&fc_port_regs
[FC_STATUS
/ 8]);
738 if (status
& SISL_STATUS_SHUTDOWN_COMPLETE
)
740 if (++retry_cnt
>= MC_RETRY_CNT
) {
741 dev_dbg(dev
, "%s: port %d shutdown processing "
742 "not yet completed\n", __func__
, i
);
745 msleep(100 * retry_cnt
);
751 * cxlflash_remove() - PCI entry point to tear down host
752 * @pdev: PCI device associated with the host.
754 * Safe to use as a cleanup in partially allocated/initialized state. Note that
755 * the reset_waitq is flushed as part of the stop/termination of user contexts.
757 static void cxlflash_remove(struct pci_dev
*pdev
)
759 struct cxlflash_cfg
*cfg
= pci_get_drvdata(pdev
);
760 struct device
*dev
= &pdev
->dev
;
763 if (!pci_is_enabled(pdev
)) {
764 dev_dbg(dev
, "%s: Device is disabled\n", __func__
);
768 /* If a Task Management Function is active, wait for it to complete
769 * before continuing with remove.
771 spin_lock_irqsave(&cfg
->tmf_slock
, lock_flags
);
773 wait_event_interruptible_lock_irq(cfg
->tmf_waitq
,
776 spin_unlock_irqrestore(&cfg
->tmf_slock
, lock_flags
);
778 /* Notify AFU and wait for shutdown processing to complete */
779 notify_shutdown(cfg
, true);
781 cfg
->state
= STATE_FAILTERM
;
782 cxlflash_stop_term_user_contexts(cfg
);
784 switch (cfg
->init_state
) {
785 case INIT_STATE_SCSI
:
786 cxlflash_term_local_luns(cfg
);
787 scsi_remove_host(cfg
->host
);
791 pci_disable_device(pdev
);
792 case INIT_STATE_NONE
:
794 scsi_host_put(cfg
->host
);
798 dev_dbg(dev
, "%s: returning\n", __func__
);
802 * alloc_mem() - allocates the AFU and its command pool
803 * @cfg: Internal structure associated with the host.
805 * A partially allocated state remains on failure.
809 * -ENOMEM on failure to allocate memory
811 static int alloc_mem(struct cxlflash_cfg
*cfg
)
814 struct device
*dev
= &cfg
->dev
->dev
;
816 /* AFU is ~28k, i.e. only one 64k page or up to seven 4k pages */
817 cfg
->afu
= (void *)__get_free_pages(GFP_KERNEL
| __GFP_ZERO
,
818 get_order(sizeof(struct afu
)));
819 if (unlikely(!cfg
->afu
)) {
820 dev_err(dev
, "%s: cannot get %d free pages\n",
821 __func__
, get_order(sizeof(struct afu
)));
825 cfg
->afu
->parent
= cfg
;
826 cfg
->afu
->desired_hwqs
= CXLFLASH_DEF_HWQS
;
827 cfg
->afu
->afu_map
= NULL
;
833 * init_pci() - initializes the host as a PCI device
834 * @cfg: Internal structure associated with the host.
836 * Return: 0 on success, -errno on failure
838 static int init_pci(struct cxlflash_cfg
*cfg
)
840 struct pci_dev
*pdev
= cfg
->dev
;
841 struct device
*dev
= &cfg
->dev
->dev
;
844 rc
= pci_enable_device(pdev
);
845 if (rc
|| pci_channel_offline(pdev
)) {
846 if (pci_channel_offline(pdev
)) {
847 cxlflash_wait_for_pci_err_recovery(cfg
);
848 rc
= pci_enable_device(pdev
);
852 dev_err(dev
, "%s: Cannot enable adapter\n", __func__
);
853 cxlflash_wait_for_pci_err_recovery(cfg
);
859 dev_dbg(dev
, "%s: returning rc=%d\n", __func__
, rc
);
864 * init_scsi() - adds the host to the SCSI stack and kicks off host scan
865 * @cfg: Internal structure associated with the host.
867 * Return: 0 on success, -errno on failure
869 static int init_scsi(struct cxlflash_cfg
*cfg
)
871 struct pci_dev
*pdev
= cfg
->dev
;
872 struct device
*dev
= &cfg
->dev
->dev
;
875 rc
= scsi_add_host(cfg
->host
, &pdev
->dev
);
877 dev_err(dev
, "%s: scsi_add_host failed rc=%d\n", __func__
, rc
);
881 scsi_scan_host(cfg
->host
);
884 dev_dbg(dev
, "%s: returning rc=%d\n", __func__
, rc
);
889 * set_port_online() - transitions the specified host FC port to online state
890 * @fc_regs: Top of MMIO region defined for specified port.
892 * The provided MMIO region must be mapped prior to call. Online state means
893 * that the FC link layer has synced, completed the handshaking process, and
894 * is ready for login to start.
896 static void set_port_online(__be64 __iomem
*fc_regs
)
900 cmdcfg
= readq_be(&fc_regs
[FC_MTIP_CMDCONFIG
/ 8]);
901 cmdcfg
&= (~FC_MTIP_CMDCONFIG_OFFLINE
); /* clear OFF_LINE */
902 cmdcfg
|= (FC_MTIP_CMDCONFIG_ONLINE
); /* set ON_LINE */
903 writeq_be(cmdcfg
, &fc_regs
[FC_MTIP_CMDCONFIG
/ 8]);
907 * set_port_offline() - transitions the specified host FC port to offline state
908 * @fc_regs: Top of MMIO region defined for specified port.
910 * The provided MMIO region must be mapped prior to call.
912 static void set_port_offline(__be64 __iomem
*fc_regs
)
916 cmdcfg
= readq_be(&fc_regs
[FC_MTIP_CMDCONFIG
/ 8]);
917 cmdcfg
&= (~FC_MTIP_CMDCONFIG_ONLINE
); /* clear ON_LINE */
918 cmdcfg
|= (FC_MTIP_CMDCONFIG_OFFLINE
); /* set OFF_LINE */
919 writeq_be(cmdcfg
, &fc_regs
[FC_MTIP_CMDCONFIG
/ 8]);
923 * wait_port_online() - waits for the specified host FC port come online
924 * @fc_regs: Top of MMIO region defined for specified port.
925 * @delay_us: Number of microseconds to delay between reading port status.
926 * @nretry: Number of cycles to retry reading port status.
928 * The provided MMIO region must be mapped prior to call. This will timeout
929 * when the cable is not plugged in.
932 * TRUE (1) when the specified port is online
933 * FALSE (0) when the specified port fails to come online after timeout
935 static bool wait_port_online(__be64 __iomem
*fc_regs
, u32 delay_us
, u32 nretry
)
939 WARN_ON(delay_us
< 1000);
942 msleep(delay_us
/ 1000);
943 status
= readq_be(&fc_regs
[FC_MTIP_STATUS
/ 8]);
944 if (status
== U64_MAX
)
946 } while ((status
& FC_MTIP_STATUS_MASK
) != FC_MTIP_STATUS_ONLINE
&&
949 return ((status
& FC_MTIP_STATUS_MASK
) == FC_MTIP_STATUS_ONLINE
);
953 * wait_port_offline() - waits for the specified host FC port go offline
954 * @fc_regs: Top of MMIO region defined for specified port.
955 * @delay_us: Number of microseconds to delay between reading port status.
956 * @nretry: Number of cycles to retry reading port status.
958 * The provided MMIO region must be mapped prior to call.
961 * TRUE (1) when the specified port is offline
962 * FALSE (0) when the specified port fails to go offline after timeout
964 static bool wait_port_offline(__be64 __iomem
*fc_regs
, u32 delay_us
, u32 nretry
)
968 WARN_ON(delay_us
< 1000);
971 msleep(delay_us
/ 1000);
972 status
= readq_be(&fc_regs
[FC_MTIP_STATUS
/ 8]);
973 if (status
== U64_MAX
)
975 } while ((status
& FC_MTIP_STATUS_MASK
) != FC_MTIP_STATUS_OFFLINE
&&
978 return ((status
& FC_MTIP_STATUS_MASK
) == FC_MTIP_STATUS_OFFLINE
);
982 * afu_set_wwpn() - configures the WWPN for the specified host FC port
983 * @afu: AFU associated with the host that owns the specified FC port.
984 * @port: Port number being configured.
985 * @fc_regs: Top of MMIO region defined for specified port.
986 * @wwpn: The world-wide-port-number previously discovered for port.
988 * The provided MMIO region must be mapped prior to call. As part of the
989 * sequence to configure the WWPN, the port is toggled offline and then back
990 * online. This toggling action can cause this routine to delay up to a few
991 * seconds. When configured to use the internal LUN feature of the AFU, a
992 * failure to come online is overridden.
994 static void afu_set_wwpn(struct afu
*afu
, int port
, __be64 __iomem
*fc_regs
,
997 struct cxlflash_cfg
*cfg
= afu
->parent
;
998 struct device
*dev
= &cfg
->dev
->dev
;
1000 set_port_offline(fc_regs
);
1001 if (!wait_port_offline(fc_regs
, FC_PORT_STATUS_RETRY_INTERVAL_US
,
1002 FC_PORT_STATUS_RETRY_CNT
)) {
1003 dev_dbg(dev
, "%s: wait on port %d to go offline timed out\n",
1007 writeq_be(wwpn
, &fc_regs
[FC_PNAME
/ 8]);
1009 set_port_online(fc_regs
);
1010 if (!wait_port_online(fc_regs
, FC_PORT_STATUS_RETRY_INTERVAL_US
,
1011 FC_PORT_STATUS_RETRY_CNT
)) {
1012 dev_dbg(dev
, "%s: wait on port %d to go online timed out\n",
1018 * afu_link_reset() - resets the specified host FC port
1019 * @afu: AFU associated with the host that owns the specified FC port.
1020 * @port: Port number being configured.
1021 * @fc_regs: Top of MMIO region defined for specified port.
1023 * The provided MMIO region must be mapped prior to call. The sequence to
1024 * reset the port involves toggling it offline and then back online. This
1025 * action can cause this routine to delay up to a few seconds. An effort
1026 * is made to maintain link with the device by switching to host to use
1027 * the alternate port exclusively while the reset takes place.
1028 * failure to come online is overridden.
1030 static void afu_link_reset(struct afu
*afu
, int port
, __be64 __iomem
*fc_regs
)
1032 struct cxlflash_cfg
*cfg
= afu
->parent
;
1033 struct device
*dev
= &cfg
->dev
->dev
;
1036 /* first switch the AFU to the other links, if any */
1037 port_sel
= readq_be(&afu
->afu_map
->global
.regs
.afu_port_sel
);
1038 port_sel
&= ~(1ULL << port
);
1039 writeq_be(port_sel
, &afu
->afu_map
->global
.regs
.afu_port_sel
);
1040 cxlflash_afu_sync(afu
, 0, 0, AFU_GSYNC
);
1042 set_port_offline(fc_regs
);
1043 if (!wait_port_offline(fc_regs
, FC_PORT_STATUS_RETRY_INTERVAL_US
,
1044 FC_PORT_STATUS_RETRY_CNT
))
1045 dev_err(dev
, "%s: wait on port %d to go offline timed out\n",
1048 set_port_online(fc_regs
);
1049 if (!wait_port_online(fc_regs
, FC_PORT_STATUS_RETRY_INTERVAL_US
,
1050 FC_PORT_STATUS_RETRY_CNT
))
1051 dev_err(dev
, "%s: wait on port %d to go online timed out\n",
1054 /* switch back to include this port */
1055 port_sel
|= (1ULL << port
);
1056 writeq_be(port_sel
, &afu
->afu_map
->global
.regs
.afu_port_sel
);
1057 cxlflash_afu_sync(afu
, 0, 0, AFU_GSYNC
);
1059 dev_dbg(dev
, "%s: returning port_sel=%016llx\n", __func__
, port_sel
);
1063 * afu_err_intr_init() - clears and initializes the AFU for error interrupts
1064 * @afu: AFU associated with the host.
1066 static void afu_err_intr_init(struct afu
*afu
)
1068 struct cxlflash_cfg
*cfg
= afu
->parent
;
1069 __be64 __iomem
*fc_port_regs
;
1071 struct hwq
*hwq
= get_hwq(afu
, PRIMARY_HWQ
);
1074 /* global async interrupts: AFU clears afu_ctrl on context exit
1075 * if async interrupts were sent to that context. This prevents
1076 * the AFU form sending further async interrupts when
1078 * nobody to receive them.
1082 writeq_be(-1ULL, &afu
->afu_map
->global
.regs
.aintr_mask
);
1083 /* set LISN# to send and point to primary master context */
1084 reg
= ((u64
) (((hwq
->ctx_hndl
<< 8) | SISL_MSI_ASYNC_ERROR
)) << 40);
1086 if (afu
->internal_lun
)
1087 reg
|= 1; /* Bit 63 indicates local lun */
1088 writeq_be(reg
, &afu
->afu_map
->global
.regs
.afu_ctrl
);
1090 writeq_be(-1ULL, &afu
->afu_map
->global
.regs
.aintr_clear
);
1091 /* unmask bits that are of interest */
1092 /* note: afu can send an interrupt after this step */
1093 writeq_be(SISL_ASTATUS_MASK
, &afu
->afu_map
->global
.regs
.aintr_mask
);
1094 /* clear again in case a bit came on after previous clear but before */
1096 writeq_be(-1ULL, &afu
->afu_map
->global
.regs
.aintr_clear
);
1098 /* Clear/Set internal lun bits */
1099 fc_port_regs
= get_fc_port_regs(cfg
, 0);
1100 reg
= readq_be(&fc_port_regs
[FC_CONFIG2
/ 8]);
1101 reg
&= SISL_FC_INTERNAL_MASK
;
1102 if (afu
->internal_lun
)
1103 reg
|= ((u64
)(afu
->internal_lun
- 1) << SISL_FC_INTERNAL_SHIFT
);
1104 writeq_be(reg
, &fc_port_regs
[FC_CONFIG2
/ 8]);
1106 /* now clear FC errors */
1107 for (i
= 0; i
< cfg
->num_fc_ports
; i
++) {
1108 fc_port_regs
= get_fc_port_regs(cfg
, i
);
1110 writeq_be(0xFFFFFFFFU
, &fc_port_regs
[FC_ERROR
/ 8]);
1111 writeq_be(0, &fc_port_regs
[FC_ERRCAP
/ 8]);
1114 /* sync interrupts for master's IOARRIN write */
1115 /* note that unlike asyncs, there can be no pending sync interrupts */
1116 /* at this time (this is a fresh context and master has not written */
1117 /* IOARRIN yet), so there is nothing to clear. */
1119 /* set LISN#, it is always sent to the context that wrote IOARRIN */
1120 for (i
= 0; i
< afu
->num_hwqs
; i
++) {
1121 hwq
= get_hwq(afu
, i
);
1123 writeq_be(SISL_MSI_SYNC_ERROR
, &hwq
->host_map
->ctx_ctrl
);
1124 writeq_be(SISL_ISTATUS_MASK
, &hwq
->host_map
->intr_mask
);
1129 * cxlflash_sync_err_irq() - interrupt handler for synchronous errors
1130 * @irq: Interrupt number.
1131 * @data: Private data provided at interrupt registration, the AFU.
1133 * Return: Always return IRQ_HANDLED.
1135 static irqreturn_t
cxlflash_sync_err_irq(int irq
, void *data
)
1137 struct hwq
*hwq
= (struct hwq
*)data
;
1138 struct cxlflash_cfg
*cfg
= hwq
->afu
->parent
;
1139 struct device
*dev
= &cfg
->dev
->dev
;
1143 reg
= readq_be(&hwq
->host_map
->intr_status
);
1144 reg_unmasked
= (reg
& SISL_ISTATUS_UNMASK
);
1146 if (reg_unmasked
== 0UL) {
1147 dev_err(dev
, "%s: spurious interrupt, intr_status=%016llx\n",
1149 goto cxlflash_sync_err_irq_exit
;
1152 dev_err(dev
, "%s: unexpected interrupt, intr_status=%016llx\n",
1155 writeq_be(reg_unmasked
, &hwq
->host_map
->intr_clear
);
1157 cxlflash_sync_err_irq_exit
:
1162 * process_hrrq() - process the read-response queue
1163 * @afu: AFU associated with the host.
1164 * @doneq: Queue of commands harvested from the RRQ.
1165 * @budget: Threshold of RRQ entries to process.
1167 * This routine must be called holding the disabled RRQ spin lock.
1169 * Return: The number of entries processed.
1171 static int process_hrrq(struct hwq
*hwq
, struct list_head
*doneq
, int budget
)
1173 struct afu
*afu
= hwq
->afu
;
1174 struct afu_cmd
*cmd
;
1175 struct sisl_ioasa
*ioasa
;
1176 struct sisl_ioarcb
*ioarcb
;
1177 bool toggle
= hwq
->toggle
;
1180 *hrrq_start
= hwq
->hrrq_start
,
1181 *hrrq_end
= hwq
->hrrq_end
,
1182 *hrrq_curr
= hwq
->hrrq_curr
;
1184 /* Process ready RRQ entries up to the specified budget (if any) */
1188 if ((entry
& SISL_RESP_HANDLE_T_BIT
) != toggle
)
1191 entry
&= ~SISL_RESP_HANDLE_T_BIT
;
1193 if (afu_is_sq_cmd_mode(afu
)) {
1194 ioasa
= (struct sisl_ioasa
*)entry
;
1195 cmd
= container_of(ioasa
, struct afu_cmd
, sa
);
1197 ioarcb
= (struct sisl_ioarcb
*)entry
;
1198 cmd
= container_of(ioarcb
, struct afu_cmd
, rcb
);
1201 list_add_tail(&cmd
->queue
, doneq
);
1203 /* Advance to next entry or wrap and flip the toggle bit */
1204 if (hrrq_curr
< hrrq_end
)
1207 hrrq_curr
= hrrq_start
;
1208 toggle
^= SISL_RESP_HANDLE_T_BIT
;
1211 atomic_inc(&hwq
->hsq_credits
);
1214 if (budget
> 0 && num_hrrq
>= budget
)
1218 hwq
->hrrq_curr
= hrrq_curr
;
1219 hwq
->toggle
= toggle
;
1225 * process_cmd_doneq() - process a queue of harvested RRQ commands
1226 * @doneq: Queue of completed commands.
1228 * Note that upon return the queue can no longer be trusted.
1230 static void process_cmd_doneq(struct list_head
*doneq
)
1232 struct afu_cmd
*cmd
, *tmp
;
1234 WARN_ON(list_empty(doneq
));
1236 list_for_each_entry_safe(cmd
, tmp
, doneq
, queue
)
1241 * cxlflash_irqpoll() - process a queue of harvested RRQ commands
1242 * @irqpoll: IRQ poll structure associated with queue to poll.
1243 * @budget: Threshold of RRQ entries to process per poll.
1245 * Return: The number of entries processed.
1247 static int cxlflash_irqpoll(struct irq_poll
*irqpoll
, int budget
)
1249 struct hwq
*hwq
= container_of(irqpoll
, struct hwq
, irqpoll
);
1250 unsigned long hrrq_flags
;
1252 int num_entries
= 0;
1254 spin_lock_irqsave(&hwq
->hrrq_slock
, hrrq_flags
);
1256 num_entries
= process_hrrq(hwq
, &doneq
, budget
);
1257 if (num_entries
< budget
)
1258 irq_poll_complete(irqpoll
);
1260 spin_unlock_irqrestore(&hwq
->hrrq_slock
, hrrq_flags
);
1262 process_cmd_doneq(&doneq
);
1267 * cxlflash_rrq_irq() - interrupt handler for read-response queue (normal path)
1268 * @irq: Interrupt number.
1269 * @data: Private data provided at interrupt registration, the AFU.
1271 * Return: IRQ_HANDLED or IRQ_NONE when no ready entries found.
1273 static irqreturn_t
cxlflash_rrq_irq(int irq
, void *data
)
1275 struct hwq
*hwq
= (struct hwq
*)data
;
1276 struct afu
*afu
= hwq
->afu
;
1277 unsigned long hrrq_flags
;
1279 int num_entries
= 0;
1281 spin_lock_irqsave(&hwq
->hrrq_slock
, hrrq_flags
);
1283 if (afu_is_irqpoll_enabled(afu
)) {
1284 irq_poll_sched(&hwq
->irqpoll
);
1285 spin_unlock_irqrestore(&hwq
->hrrq_slock
, hrrq_flags
);
1289 num_entries
= process_hrrq(hwq
, &doneq
, -1);
1290 spin_unlock_irqrestore(&hwq
->hrrq_slock
, hrrq_flags
);
1292 if (num_entries
== 0)
1295 process_cmd_doneq(&doneq
);
1300 * Asynchronous interrupt information table
1303 * - Order matters here as this array is indexed by bit position.
1305 * - The checkpatch script considers the BUILD_SISL_ASTATUS_FC_PORT macro
1306 * as complex and complains due to a lack of parentheses/braces.
1308 #define ASTATUS_FC(_a, _b, _c, _d) \
1309 { SISL_ASTATUS_FC##_a##_##_b, _c, _a, (_d) }
1311 #define BUILD_SISL_ASTATUS_FC_PORT(_a) \
1312 ASTATUS_FC(_a, LINK_UP, "link up", 0), \
1313 ASTATUS_FC(_a, LINK_DN, "link down", 0), \
1314 ASTATUS_FC(_a, LOGI_S, "login succeeded", SCAN_HOST), \
1315 ASTATUS_FC(_a, LOGI_F, "login failed", CLR_FC_ERROR), \
1316 ASTATUS_FC(_a, LOGI_R, "login timed out, retrying", LINK_RESET), \
1317 ASTATUS_FC(_a, CRC_T, "CRC threshold exceeded", LINK_RESET), \
1318 ASTATUS_FC(_a, LOGO, "target initiated LOGO", 0), \
1319 ASTATUS_FC(_a, OTHER, "other error", CLR_FC_ERROR | LINK_RESET)
1321 static const struct asyc_intr_info ainfo
[] = {
1322 BUILD_SISL_ASTATUS_FC_PORT(1),
1323 BUILD_SISL_ASTATUS_FC_PORT(0),
1324 BUILD_SISL_ASTATUS_FC_PORT(3),
1325 BUILD_SISL_ASTATUS_FC_PORT(2)
1329 * cxlflash_async_err_irq() - interrupt handler for asynchronous errors
1330 * @irq: Interrupt number.
1331 * @data: Private data provided at interrupt registration, the AFU.
1333 * Return: Always return IRQ_HANDLED.
1335 static irqreturn_t
cxlflash_async_err_irq(int irq
, void *data
)
1337 struct hwq
*hwq
= (struct hwq
*)data
;
1338 struct afu
*afu
= hwq
->afu
;
1339 struct cxlflash_cfg
*cfg
= afu
->parent
;
1340 struct device
*dev
= &cfg
->dev
->dev
;
1341 const struct asyc_intr_info
*info
;
1342 struct sisl_global_map __iomem
*global
= &afu
->afu_map
->global
;
1343 __be64 __iomem
*fc_port_regs
;
1349 reg
= readq_be(&global
->regs
.aintr_status
);
1350 reg_unmasked
= (reg
& SISL_ASTATUS_UNMASK
);
1352 if (unlikely(reg_unmasked
== 0)) {
1353 dev_err(dev
, "%s: spurious interrupt, aintr_status=%016llx\n",
1358 /* FYI, it is 'okay' to clear AFU status before FC_ERROR */
1359 writeq_be(reg_unmasked
, &global
->regs
.aintr_clear
);
1361 /* Check each bit that is on */
1362 for_each_set_bit(bit
, (ulong
*)®_unmasked
, BITS_PER_LONG
) {
1363 if (unlikely(bit
>= ARRAY_SIZE(ainfo
))) {
1369 if (unlikely(info
->status
!= 1ULL << bit
)) {
1375 fc_port_regs
= get_fc_port_regs(cfg
, port
);
1377 dev_err(dev
, "%s: FC Port %d -> %s, fc_status=%016llx\n",
1378 __func__
, port
, info
->desc
,
1379 readq_be(&fc_port_regs
[FC_STATUS
/ 8]));
1382 * Do link reset first, some OTHER errors will set FC_ERROR
1383 * again if cleared before or w/o a reset
1385 if (info
->action
& LINK_RESET
) {
1386 dev_err(dev
, "%s: FC Port %d: resetting link\n",
1388 cfg
->lr_state
= LINK_RESET_REQUIRED
;
1389 cfg
->lr_port
= port
;
1390 schedule_work(&cfg
->work_q
);
1393 if (info
->action
& CLR_FC_ERROR
) {
1394 reg
= readq_be(&fc_port_regs
[FC_ERROR
/ 8]);
1397 * Since all errors are unmasked, FC_ERROR and FC_ERRCAP
1398 * should be the same and tracing one is sufficient.
1401 dev_err(dev
, "%s: fc %d: clearing fc_error=%016llx\n",
1402 __func__
, port
, reg
);
1404 writeq_be(reg
, &fc_port_regs
[FC_ERROR
/ 8]);
1405 writeq_be(0, &fc_port_regs
[FC_ERRCAP
/ 8]);
1408 if (info
->action
& SCAN_HOST
) {
1409 atomic_inc(&cfg
->scan_host_needed
);
1410 schedule_work(&cfg
->work_q
);
1419 * start_context() - starts the master context
1420 * @cfg: Internal structure associated with the host.
1421 * @index: Index of the hardware queue.
1423 * Return: A success or failure value from CXL services.
1425 static int start_context(struct cxlflash_cfg
*cfg
, u32 index
)
1427 struct device
*dev
= &cfg
->dev
->dev
;
1428 struct hwq
*hwq
= get_hwq(cfg
->afu
, index
);
1431 rc
= cxl_start_context(hwq
->ctx
,
1432 hwq
->work
.work_element_descriptor
,
1435 dev_dbg(dev
, "%s: returning rc=%d\n", __func__
, rc
);
1440 * read_vpd() - obtains the WWPNs from VPD
1441 * @cfg: Internal structure associated with the host.
1442 * @wwpn: Array of size MAX_FC_PORTS to pass back WWPNs
1444 * Return: 0 on success, -errno on failure
1446 static int read_vpd(struct cxlflash_cfg
*cfg
, u64 wwpn
[])
1448 struct device
*dev
= &cfg
->dev
->dev
;
1449 struct pci_dev
*pdev
= cfg
->dev
;
1451 int ro_start
, ro_size
, i
, j
, k
;
1453 char vpd_data
[CXLFLASH_VPD_LEN
];
1454 char tmp_buf
[WWPN_BUF_LEN
] = { 0 };
1455 char *wwpn_vpd_tags
[MAX_FC_PORTS
] = { "V5", "V6", "V7", "V8" };
1457 /* Get the VPD data from the device */
1458 vpd_size
= cxl_read_adapter_vpd(pdev
, vpd_data
, sizeof(vpd_data
));
1459 if (unlikely(vpd_size
<= 0)) {
1460 dev_err(dev
, "%s: Unable to read VPD (size = %ld)\n",
1461 __func__
, vpd_size
);
1466 /* Get the read only section offset */
1467 ro_start
= pci_vpd_find_tag(vpd_data
, 0, vpd_size
,
1468 PCI_VPD_LRDT_RO_DATA
);
1469 if (unlikely(ro_start
< 0)) {
1470 dev_err(dev
, "%s: VPD Read-only data not found\n", __func__
);
1475 /* Get the read only section size, cap when extends beyond read VPD */
1476 ro_size
= pci_vpd_lrdt_size(&vpd_data
[ro_start
]);
1478 i
= ro_start
+ PCI_VPD_LRDT_TAG_SIZE
;
1479 if (unlikely((i
+ j
) > vpd_size
)) {
1480 dev_dbg(dev
, "%s: Might need to read more VPD (%d > %ld)\n",
1481 __func__
, (i
+ j
), vpd_size
);
1482 ro_size
= vpd_size
- i
;
1486 * Find the offset of the WWPN tag within the read only
1487 * VPD data and validate the found field (partials are
1488 * no good to us). Convert the ASCII data to an integer
1489 * value. Note that we must copy to a temporary buffer
1490 * because the conversion service requires that the ASCII
1491 * string be terminated.
1493 for (k
= 0; k
< cfg
->num_fc_ports
; k
++) {
1495 i
= ro_start
+ PCI_VPD_LRDT_TAG_SIZE
;
1497 i
= pci_vpd_find_info_keyword(vpd_data
, i
, j
, wwpn_vpd_tags
[k
]);
1498 if (unlikely(i
< 0)) {
1499 dev_err(dev
, "%s: Port %d WWPN not found in VPD\n",
1505 j
= pci_vpd_info_field_size(&vpd_data
[i
]);
1506 i
+= PCI_VPD_INFO_FLD_HDR_SIZE
;
1507 if (unlikely((i
+ j
> vpd_size
) || (j
!= WWPN_LEN
))) {
1508 dev_err(dev
, "%s: Port %d WWPN incomplete or bad VPD\n",
1514 memcpy(tmp_buf
, &vpd_data
[i
], WWPN_LEN
);
1515 rc
= kstrtoul(tmp_buf
, WWPN_LEN
, (ulong
*)&wwpn
[k
]);
1517 dev_err(dev
, "%s: WWPN conversion failed for port %d\n",
1523 dev_dbg(dev
, "%s: wwpn%d=%016llx\n", __func__
, k
, wwpn
[k
]);
1527 dev_dbg(dev
, "%s: returning rc=%d\n", __func__
, rc
);
1532 * init_pcr() - initialize the provisioning and control registers
1533 * @cfg: Internal structure associated with the host.
1535 * Also sets up fast access to the mapped registers and initializes AFU
1536 * command fields that never change.
1538 static void init_pcr(struct cxlflash_cfg
*cfg
)
1540 struct afu
*afu
= cfg
->afu
;
1541 struct sisl_ctrl_map __iomem
*ctrl_map
;
1545 for (i
= 0; i
< MAX_CONTEXT
; i
++) {
1546 ctrl_map
= &afu
->afu_map
->ctrls
[i
].ctrl
;
1547 /* Disrupt any clients that could be running */
1548 /* e.g. clients that survived a master restart */
1549 writeq_be(0, &ctrl_map
->rht_start
);
1550 writeq_be(0, &ctrl_map
->rht_cnt_id
);
1551 writeq_be(0, &ctrl_map
->ctx_cap
);
1554 /* Copy frequently used fields into hwq */
1555 for (i
= 0; i
< afu
->num_hwqs
; i
++) {
1556 hwq
= get_hwq(afu
, i
);
1558 hwq
->ctx_hndl
= (u16
) cxl_process_element(hwq
->ctx
);
1559 hwq
->host_map
= &afu
->afu_map
->hosts
[hwq
->ctx_hndl
].host
;
1560 hwq
->ctrl_map
= &afu
->afu_map
->ctrls
[hwq
->ctx_hndl
].ctrl
;
1562 /* Program the Endian Control for the master context */
1563 writeq_be(SISL_ENDIAN_CTRL
, &hwq
->host_map
->endian_ctrl
);
1568 * init_global() - initialize AFU global registers
1569 * @cfg: Internal structure associated with the host.
1571 static int init_global(struct cxlflash_cfg
*cfg
)
1573 struct afu
*afu
= cfg
->afu
;
1574 struct device
*dev
= &cfg
->dev
->dev
;
1576 struct sisl_host_map __iomem
*hmap
;
1577 __be64 __iomem
*fc_port_regs
;
1578 u64 wwpn
[MAX_FC_PORTS
]; /* wwpn of AFU ports */
1579 int i
= 0, num_ports
= 0;
1583 rc
= read_vpd(cfg
, &wwpn
[0]);
1585 dev_err(dev
, "%s: could not read vpd rc=%d\n", __func__
, rc
);
1589 /* Set up RRQ and SQ in HWQ for master issued cmds */
1590 for (i
= 0; i
< afu
->num_hwqs
; i
++) {
1591 hwq
= get_hwq(afu
, i
);
1592 hmap
= hwq
->host_map
;
1594 writeq_be((u64
) hwq
->hrrq_start
, &hmap
->rrq_start
);
1595 writeq_be((u64
) hwq
->hrrq_end
, &hmap
->rrq_end
);
1597 if (afu_is_sq_cmd_mode(afu
)) {
1598 writeq_be((u64
)hwq
->hsq_start
, &hmap
->sq_start
);
1599 writeq_be((u64
)hwq
->hsq_end
, &hmap
->sq_end
);
1603 /* AFU configuration */
1604 reg
= readq_be(&afu
->afu_map
->global
.regs
.afu_config
);
1605 reg
|= SISL_AFUCONF_AR_ALL
|SISL_AFUCONF_ENDIAN
;
1606 /* enable all auto retry options and control endianness */
1607 /* leave others at default: */
1608 /* CTX_CAP write protected, mbox_r does not clear on read and */
1609 /* checker on if dual afu */
1610 writeq_be(reg
, &afu
->afu_map
->global
.regs
.afu_config
);
1612 /* Global port select: select either port */
1613 if (afu
->internal_lun
) {
1614 /* Only use port 0 */
1615 writeq_be(PORT0
, &afu
->afu_map
->global
.regs
.afu_port_sel
);
1618 writeq_be(PORT_MASK(cfg
->num_fc_ports
),
1619 &afu
->afu_map
->global
.regs
.afu_port_sel
);
1620 num_ports
= cfg
->num_fc_ports
;
1623 for (i
= 0; i
< num_ports
; i
++) {
1624 fc_port_regs
= get_fc_port_regs(cfg
, i
);
1626 /* Unmask all errors (but they are still masked at AFU) */
1627 writeq_be(0, &fc_port_regs
[FC_ERRMSK
/ 8]);
1628 /* Clear CRC error cnt & set a threshold */
1629 (void)readq_be(&fc_port_regs
[FC_CNT_CRCERR
/ 8]);
1630 writeq_be(MC_CRC_THRESH
, &fc_port_regs
[FC_CRC_THRESH
/ 8]);
1632 /* Set WWPNs. If already programmed, wwpn[i] is 0 */
1634 afu_set_wwpn(afu
, i
, &fc_port_regs
[0], wwpn
[i
]);
1635 /* Programming WWPN back to back causes additional
1636 * offline/online transitions and a PLOGI
1641 /* Set up master's own CTX_CAP to allow real mode, host translation */
1642 /* tables, afu cmds and read/write GSCSI cmds. */
1643 /* First, unlock ctx_cap write by reading mbox */
1644 for (i
= 0; i
< afu
->num_hwqs
; i
++) {
1645 hwq
= get_hwq(afu
, i
);
1647 (void)readq_be(&hwq
->ctrl_map
->mbox_r
); /* unlock ctx_cap */
1648 writeq_be((SISL_CTX_CAP_REAL_MODE
| SISL_CTX_CAP_HOST_XLATE
|
1649 SISL_CTX_CAP_READ_CMD
| SISL_CTX_CAP_WRITE_CMD
|
1650 SISL_CTX_CAP_AFU_CMD
| SISL_CTX_CAP_GSCSI_CMD
),
1651 &hwq
->ctrl_map
->ctx_cap
);
1653 /* Initialize heartbeat */
1654 afu
->hb
= readq_be(&afu
->afu_map
->global
.regs
.afu_hb
);
1660 * start_afu() - initializes and starts the AFU
1661 * @cfg: Internal structure associated with the host.
1663 static int start_afu(struct cxlflash_cfg
*cfg
)
1665 struct afu
*afu
= cfg
->afu
;
1666 struct device
*dev
= &cfg
->dev
->dev
;
1673 /* Initialize each HWQ */
1674 for (i
= 0; i
< afu
->num_hwqs
; i
++) {
1675 hwq
= get_hwq(afu
, i
);
1677 /* After an AFU reset, RRQ entries are stale, clear them */
1678 memset(&hwq
->rrq_entry
, 0, sizeof(hwq
->rrq_entry
));
1680 /* Initialize RRQ pointers */
1681 hwq
->hrrq_start
= &hwq
->rrq_entry
[0];
1682 hwq
->hrrq_end
= &hwq
->rrq_entry
[NUM_RRQ_ENTRY
- 1];
1683 hwq
->hrrq_curr
= hwq
->hrrq_start
;
1685 spin_lock_init(&hwq
->hrrq_slock
);
1688 if (afu_is_sq_cmd_mode(afu
)) {
1689 memset(&hwq
->sq
, 0, sizeof(hwq
->sq
));
1690 hwq
->hsq_start
= &hwq
->sq
[0];
1691 hwq
->hsq_end
= &hwq
->sq
[NUM_SQ_ENTRY
- 1];
1692 hwq
->hsq_curr
= hwq
->hsq_start
;
1694 spin_lock_init(&hwq
->hsq_slock
);
1695 atomic_set(&hwq
->hsq_credits
, NUM_SQ_ENTRY
- 1);
1698 /* Initialize IRQ poll */
1699 if (afu_is_irqpoll_enabled(afu
))
1700 irq_poll_init(&hwq
->irqpoll
, afu
->irqpoll_weight
,
1705 rc
= init_global(cfg
);
1707 dev_dbg(dev
, "%s: returning rc=%d\n", __func__
, rc
);
1712 * init_intr() - setup interrupt handlers for the master context
1713 * @cfg: Internal structure associated with the host.
1714 * @hwq: Hardware queue to initialize.
1716 * Return: 0 on success, -errno on failure
1718 static enum undo_level
init_intr(struct cxlflash_cfg
*cfg
,
1721 struct device
*dev
= &cfg
->dev
->dev
;
1722 struct cxl_context
*ctx
= hwq
->ctx
;
1724 enum undo_level level
= UNDO_NOOP
;
1725 bool is_primary_hwq
= (hwq
->index
== PRIMARY_HWQ
);
1726 int num_irqs
= is_primary_hwq
? 3 : 2;
1728 rc
= cxl_allocate_afu_irqs(ctx
, num_irqs
);
1730 dev_err(dev
, "%s: allocate_afu_irqs failed rc=%d\n",
1736 rc
= cxl_map_afu_irq(ctx
, 1, cxlflash_sync_err_irq
, hwq
,
1737 "SISL_MSI_SYNC_ERROR");
1738 if (unlikely(rc
<= 0)) {
1739 dev_err(dev
, "%s: SISL_MSI_SYNC_ERROR map failed\n", __func__
);
1744 rc
= cxl_map_afu_irq(ctx
, 2, cxlflash_rrq_irq
, hwq
,
1745 "SISL_MSI_RRQ_UPDATED");
1746 if (unlikely(rc
<= 0)) {
1747 dev_err(dev
, "%s: SISL_MSI_RRQ_UPDATED map failed\n", __func__
);
1752 /* SISL_MSI_ASYNC_ERROR is setup only for the primary HWQ */
1753 if (!is_primary_hwq
)
1756 rc
= cxl_map_afu_irq(ctx
, 3, cxlflash_async_err_irq
, hwq
,
1757 "SISL_MSI_ASYNC_ERROR");
1758 if (unlikely(rc
<= 0)) {
1759 dev_err(dev
, "%s: SISL_MSI_ASYNC_ERROR map failed\n", __func__
);
1768 * init_mc() - create and register as the master context
1769 * @cfg: Internal structure associated with the host.
1770 * index: HWQ Index of the master context.
1772 * Return: 0 on success, -errno on failure
1774 static int init_mc(struct cxlflash_cfg
*cfg
, u32 index
)
1776 struct cxl_context
*ctx
;
1777 struct device
*dev
= &cfg
->dev
->dev
;
1778 struct hwq
*hwq
= get_hwq(cfg
->afu
, index
);
1780 enum undo_level level
;
1782 hwq
->afu
= cfg
->afu
;
1785 if (index
== PRIMARY_HWQ
)
1786 ctx
= cxl_get_context(cfg
->dev
);
1788 ctx
= cxl_dev_context_init(cfg
->dev
);
1789 if (unlikely(!ctx
)) {
1797 /* Set it up as a master with the CXL */
1798 cxl_set_master(ctx
);
1800 /* Reset AFU when initializing primary context */
1801 if (index
== PRIMARY_HWQ
) {
1802 rc
= cxl_afu_reset(ctx
);
1804 dev_err(dev
, "%s: AFU reset failed rc=%d\n",
1810 level
= init_intr(cfg
, hwq
);
1811 if (unlikely(level
)) {
1812 dev_err(dev
, "%s: interrupt init failed rc=%d\n", __func__
, rc
);
1816 /* This performs the equivalent of the CXL_IOCTL_START_WORK.
1817 * The CXL_IOCTL_GET_PROCESS_ELEMENT is implicit in the process
1818 * element (pe) that is embedded in the context (ctx)
1820 rc
= start_context(cfg
, index
);
1822 dev_err(dev
, "%s: start context failed rc=%d\n", __func__
, rc
);
1823 level
= UNMAP_THREE
;
1828 dev_dbg(dev
, "%s: returning rc=%d\n", __func__
, rc
);
1831 term_intr(cfg
, level
, index
);
1832 if (index
!= PRIMARY_HWQ
)
1833 cxl_release_context(ctx
);
1840 * get_num_afu_ports() - determines and configures the number of AFU ports
1841 * @cfg: Internal structure associated with the host.
1843 * This routine determines the number of AFU ports by converting the global
1844 * port selection mask. The converted value is only valid following an AFU
1845 * reset (explicit or power-on). This routine must be invoked shortly after
1846 * mapping as other routines are dependent on the number of ports during the
1847 * initialization sequence.
1849 * To support legacy AFUs that might not have reflected an initial global
1850 * port mask (value read is 0), default to the number of ports originally
1851 * supported by the cxlflash driver (2) before hardware with other port
1852 * offerings was introduced.
1854 static void get_num_afu_ports(struct cxlflash_cfg
*cfg
)
1856 struct afu
*afu
= cfg
->afu
;
1857 struct device
*dev
= &cfg
->dev
->dev
;
1859 int num_fc_ports
= LEGACY_FC_PORTS
;
1861 port_mask
= readq_be(&afu
->afu_map
->global
.regs
.afu_port_sel
);
1862 if (port_mask
!= 0ULL)
1863 num_fc_ports
= min(ilog2(port_mask
) + 1, MAX_FC_PORTS
);
1865 dev_dbg(dev
, "%s: port_mask=%016llx num_fc_ports=%d\n",
1866 __func__
, port_mask
, num_fc_ports
);
1868 cfg
->num_fc_ports
= num_fc_ports
;
1869 cfg
->host
->max_channel
= PORTNUM2CHAN(num_fc_ports
);
1873 * init_afu() - setup as master context and start AFU
1874 * @cfg: Internal structure associated with the host.
1876 * This routine is a higher level of control for configuring the
1877 * AFU on probe and reset paths.
1879 * Return: 0 on success, -errno on failure
1881 static int init_afu(struct cxlflash_cfg
*cfg
)
1885 struct afu
*afu
= cfg
->afu
;
1886 struct device
*dev
= &cfg
->dev
->dev
;
1890 cxl_perst_reloads_same_image(cfg
->cxl_afu
, true);
1892 afu
->num_hwqs
= afu
->desired_hwqs
;
1893 for (i
= 0; i
< afu
->num_hwqs
; i
++) {
1894 rc
= init_mc(cfg
, i
);
1896 dev_err(dev
, "%s: init_mc failed rc=%d index=%d\n",
1902 /* Map the entire MMIO space of the AFU using the first context */
1903 hwq
= get_hwq(afu
, PRIMARY_HWQ
);
1904 afu
->afu_map
= cxl_psa_map(hwq
->ctx
);
1905 if (!afu
->afu_map
) {
1906 dev_err(dev
, "%s: cxl_psa_map failed\n", __func__
);
1911 /* No byte reverse on reading afu_version or string will be backwards */
1912 reg
= readq(&afu
->afu_map
->global
.regs
.afu_version
);
1913 memcpy(afu
->version
, ®
, sizeof(reg
));
1914 afu
->interface_version
=
1915 readq_be(&afu
->afu_map
->global
.regs
.interface_version
);
1916 if ((afu
->interface_version
+ 1) == 0) {
1917 dev_err(dev
, "Back level AFU, please upgrade. AFU version %s "
1918 "interface version %016llx\n", afu
->version
,
1919 afu
->interface_version
);
1924 if (afu_is_sq_cmd_mode(afu
)) {
1925 afu
->send_cmd
= send_cmd_sq
;
1926 afu
->context_reset
= context_reset_sq
;
1928 afu
->send_cmd
= send_cmd_ioarrin
;
1929 afu
->context_reset
= context_reset_ioarrin
;
1932 dev_dbg(dev
, "%s: afu_ver=%s interface_ver=%016llx\n", __func__
,
1933 afu
->version
, afu
->interface_version
);
1935 get_num_afu_ports(cfg
);
1937 rc
= start_afu(cfg
);
1939 dev_err(dev
, "%s: start_afu failed, rc=%d\n", __func__
, rc
);
1943 afu_err_intr_init(cfg
->afu
);
1944 for (i
= 0; i
< afu
->num_hwqs
; i
++) {
1945 hwq
= get_hwq(afu
, i
);
1947 spin_lock_init(&hwq
->rrin_slock
);
1948 hwq
->room
= readq_be(&hwq
->host_map
->cmd_room
);
1951 /* Restore the LUN mappings */
1952 cxlflash_restore_luntable(cfg
);
1954 dev_dbg(dev
, "%s: returning rc=%d\n", __func__
, rc
);
1958 for (i
= afu
->num_hwqs
- 1; i
>= 0; i
--) {
1959 term_intr(cfg
, UNMAP_THREE
, i
);
1966 * cxlflash_afu_sync() - builds and sends an AFU sync command
1967 * @afu: AFU associated with the host.
1968 * @ctx_hndl_u: Identifies context requesting sync.
1969 * @res_hndl_u: Identifies resource requesting sync.
1970 * @mode: Type of sync to issue (lightweight, heavyweight, global).
1972 * The AFU can only take 1 sync command at a time. This routine enforces this
1973 * limitation by using a mutex to provide exclusive access to the AFU during
1974 * the sync. This design point requires calling threads to not be on interrupt
1975 * context due to the possibility of sleeping during concurrent sync operations.
1977 * AFU sync operations are only necessary and allowed when the device is
1978 * operating normally. When not operating normally, sync requests can occur as
1979 * part of cleaning up resources associated with an adapter prior to removal.
1980 * In this scenario, these requests are simply ignored (safe due to the AFU
1987 int cxlflash_afu_sync(struct afu
*afu
, ctx_hndl_t ctx_hndl_u
,
1988 res_hndl_t res_hndl_u
, u8 mode
)
1990 struct cxlflash_cfg
*cfg
= afu
->parent
;
1991 struct device
*dev
= &cfg
->dev
->dev
;
1992 struct afu_cmd
*cmd
= NULL
;
1993 struct hwq
*hwq
= get_hwq(afu
, PRIMARY_HWQ
);
1996 static DEFINE_MUTEX(sync_active
);
1998 if (cfg
->state
!= STATE_NORMAL
) {
1999 dev_dbg(dev
, "%s: Sync not required state=%u\n",
2000 __func__
, cfg
->state
);
2004 mutex_lock(&sync_active
);
2005 atomic_inc(&afu
->cmds_active
);
2006 buf
= kzalloc(sizeof(*cmd
) + __alignof__(*cmd
) - 1, GFP_KERNEL
);
2007 if (unlikely(!buf
)) {
2008 dev_err(dev
, "%s: no memory for command\n", __func__
);
2013 cmd
= (struct afu_cmd
*)PTR_ALIGN(buf
, __alignof__(*cmd
));
2014 init_completion(&cmd
->cevent
);
2016 cmd
->hwq_index
= hwq
->index
;
2018 dev_dbg(dev
, "%s: afu=%p cmd=%p %d\n", __func__
, afu
, cmd
, ctx_hndl_u
);
2020 cmd
->rcb
.req_flags
= SISL_REQ_FLAGS_AFU_CMD
;
2021 cmd
->rcb
.ctx_id
= hwq
->ctx_hndl
;
2022 cmd
->rcb
.msi
= SISL_MSI_RRQ_UPDATED
;
2023 cmd
->rcb
.timeout
= MC_AFU_SYNC_TIMEOUT
;
2025 cmd
->rcb
.cdb
[0] = 0xC0; /* AFU Sync */
2026 cmd
->rcb
.cdb
[1] = mode
;
2028 /* The cdb is aligned, no unaligned accessors required */
2029 *((__be16
*)&cmd
->rcb
.cdb
[2]) = cpu_to_be16(ctx_hndl_u
);
2030 *((__be32
*)&cmd
->rcb
.cdb
[4]) = cpu_to_be32(res_hndl_u
);
2032 rc
= afu
->send_cmd(afu
, cmd
);
2036 rc
= wait_resp(afu
, cmd
);
2040 atomic_dec(&afu
->cmds_active
);
2041 mutex_unlock(&sync_active
);
2043 dev_dbg(dev
, "%s: returning rc=%d\n", __func__
, rc
);
2048 * afu_reset() - resets the AFU
2049 * @cfg: Internal structure associated with the host.
2051 * Return: 0 on success, -errno on failure
2053 static int afu_reset(struct cxlflash_cfg
*cfg
)
2055 struct device
*dev
= &cfg
->dev
->dev
;
2058 /* Stop the context before the reset. Since the context is
2059 * no longer available restart it after the reset is complete
2065 dev_dbg(dev
, "%s: returning rc=%d\n", __func__
, rc
);
2070 * drain_ioctls() - wait until all currently executing ioctls have completed
2071 * @cfg: Internal structure associated with the host.
2073 * Obtain write access to read/write semaphore that wraps ioctl
2074 * handling to 'drain' ioctls currently executing.
2076 static void drain_ioctls(struct cxlflash_cfg
*cfg
)
2078 down_write(&cfg
->ioctl_rwsem
);
2079 up_write(&cfg
->ioctl_rwsem
);
2083 * cxlflash_eh_device_reset_handler() - reset a single LUN
2084 * @scp: SCSI command to send.
2087 * SUCCESS as defined in scsi/scsi.h
2088 * FAILED as defined in scsi/scsi.h
2090 static int cxlflash_eh_device_reset_handler(struct scsi_cmnd
*scp
)
2093 struct Scsi_Host
*host
= scp
->device
->host
;
2094 struct cxlflash_cfg
*cfg
= shost_priv(host
);
2095 struct device
*dev
= &cfg
->dev
->dev
;
2096 struct afu
*afu
= cfg
->afu
;
2099 dev_dbg(dev
, "%s: (scp=%p) %d/%d/%d/%llu "
2100 "cdb=(%08x-%08x-%08x-%08x)\n", __func__
, scp
, host
->host_no
,
2101 scp
->device
->channel
, scp
->device
->id
, scp
->device
->lun
,
2102 get_unaligned_be32(&((u32
*)scp
->cmnd
)[0]),
2103 get_unaligned_be32(&((u32
*)scp
->cmnd
)[1]),
2104 get_unaligned_be32(&((u32
*)scp
->cmnd
)[2]),
2105 get_unaligned_be32(&((u32
*)scp
->cmnd
)[3]));
2108 switch (cfg
->state
) {
2110 rcr
= send_tmf(afu
, scp
, TMF_LUN_RESET
);
2115 wait_event(cfg
->reset_waitq
, cfg
->state
!= STATE_RESET
);
2122 dev_dbg(dev
, "%s: returning rc=%d\n", __func__
, rc
);
2127 * cxlflash_eh_host_reset_handler() - reset the host adapter
2128 * @scp: SCSI command from stack identifying host.
2130 * Following a reset, the state is evaluated again in case an EEH occurred
2131 * during the reset. In such a scenario, the host reset will either yield
2132 * until the EEH recovery is complete or return success or failure based
2133 * upon the current device state.
2136 * SUCCESS as defined in scsi/scsi.h
2137 * FAILED as defined in scsi/scsi.h
2139 static int cxlflash_eh_host_reset_handler(struct scsi_cmnd
*scp
)
2143 struct Scsi_Host
*host
= scp
->device
->host
;
2144 struct cxlflash_cfg
*cfg
= shost_priv(host
);
2145 struct device
*dev
= &cfg
->dev
->dev
;
2147 dev_dbg(dev
, "%s: (scp=%p) %d/%d/%d/%llu "
2148 "cdb=(%08x-%08x-%08x-%08x)\n", __func__
, scp
, host
->host_no
,
2149 scp
->device
->channel
, scp
->device
->id
, scp
->device
->lun
,
2150 get_unaligned_be32(&((u32
*)scp
->cmnd
)[0]),
2151 get_unaligned_be32(&((u32
*)scp
->cmnd
)[1]),
2152 get_unaligned_be32(&((u32
*)scp
->cmnd
)[2]),
2153 get_unaligned_be32(&((u32
*)scp
->cmnd
)[3]));
2155 switch (cfg
->state
) {
2157 cfg
->state
= STATE_RESET
;
2159 cxlflash_mark_contexts_error(cfg
);
2160 rcr
= afu_reset(cfg
);
2163 cfg
->state
= STATE_FAILTERM
;
2165 cfg
->state
= STATE_NORMAL
;
2166 wake_up_all(&cfg
->reset_waitq
);
2170 wait_event(cfg
->reset_waitq
, cfg
->state
!= STATE_RESET
);
2171 if (cfg
->state
== STATE_NORMAL
)
2179 dev_dbg(dev
, "%s: returning rc=%d\n", __func__
, rc
);
2184 * cxlflash_change_queue_depth() - change the queue depth for the device
2185 * @sdev: SCSI device destined for queue depth change.
2186 * @qdepth: Requested queue depth value to set.
2188 * The requested queue depth is capped to the maximum supported value.
2190 * Return: The actual queue depth set.
2192 static int cxlflash_change_queue_depth(struct scsi_device
*sdev
, int qdepth
)
2195 if (qdepth
> CXLFLASH_MAX_CMDS_PER_LUN
)
2196 qdepth
= CXLFLASH_MAX_CMDS_PER_LUN
;
2198 scsi_change_queue_depth(sdev
, qdepth
);
2199 return sdev
->queue_depth
;
2203 * cxlflash_show_port_status() - queries and presents the current port status
2204 * @port: Desired port for status reporting.
2205 * @cfg: Internal structure associated with the host.
2206 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
2208 * Return: The size of the ASCII string returned in @buf or -EINVAL.
2210 static ssize_t
cxlflash_show_port_status(u32 port
,
2211 struct cxlflash_cfg
*cfg
,
2214 struct device
*dev
= &cfg
->dev
->dev
;
2217 __be64 __iomem
*fc_port_regs
;
2219 WARN_ON(port
>= MAX_FC_PORTS
);
2221 if (port
>= cfg
->num_fc_ports
) {
2222 dev_info(dev
, "%s: Port %d not supported on this card.\n",
2227 fc_port_regs
= get_fc_port_regs(cfg
, port
);
2228 status
= readq_be(&fc_port_regs
[FC_MTIP_STATUS
/ 8]);
2229 status
&= FC_MTIP_STATUS_MASK
;
2231 if (status
== FC_MTIP_STATUS_ONLINE
)
2232 disp_status
= "online";
2233 else if (status
== FC_MTIP_STATUS_OFFLINE
)
2234 disp_status
= "offline";
2236 disp_status
= "unknown";
2238 return scnprintf(buf
, PAGE_SIZE
, "%s\n", disp_status
);
2242 * port0_show() - queries and presents the current status of port 0
2243 * @dev: Generic device associated with the host owning the port.
2244 * @attr: Device attribute representing the port.
2245 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
2247 * Return: The size of the ASCII string returned in @buf.
2249 static ssize_t
port0_show(struct device
*dev
,
2250 struct device_attribute
*attr
,
2253 struct cxlflash_cfg
*cfg
= shost_priv(class_to_shost(dev
));
2255 return cxlflash_show_port_status(0, cfg
, buf
);
2259 * port1_show() - queries and presents the current status of port 1
2260 * @dev: Generic device associated with the host owning the port.
2261 * @attr: Device attribute representing the port.
2262 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
2264 * Return: The size of the ASCII string returned in @buf.
2266 static ssize_t
port1_show(struct device
*dev
,
2267 struct device_attribute
*attr
,
2270 struct cxlflash_cfg
*cfg
= shost_priv(class_to_shost(dev
));
2272 return cxlflash_show_port_status(1, cfg
, buf
);
2276 * port2_show() - queries and presents the current status of port 2
2277 * @dev: Generic device associated with the host owning the port.
2278 * @attr: Device attribute representing the port.
2279 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
2281 * Return: The size of the ASCII string returned in @buf.
2283 static ssize_t
port2_show(struct device
*dev
,
2284 struct device_attribute
*attr
,
2287 struct cxlflash_cfg
*cfg
= shost_priv(class_to_shost(dev
));
2289 return cxlflash_show_port_status(2, cfg
, buf
);
2293 * port3_show() - queries and presents the current status of port 3
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
port3_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(3, cfg
, buf
);
2310 * lun_mode_show() - presents the current LUN mode of the host
2311 * @dev: Generic device associated with the host.
2312 * @attr: Device attribute representing the LUN mode.
2313 * @buf: Buffer of length PAGE_SIZE to report back the LUN mode in ASCII.
2315 * Return: The size of the ASCII string returned in @buf.
2317 static ssize_t
lun_mode_show(struct device
*dev
,
2318 struct device_attribute
*attr
, char *buf
)
2320 struct cxlflash_cfg
*cfg
= shost_priv(class_to_shost(dev
));
2321 struct afu
*afu
= cfg
->afu
;
2323 return scnprintf(buf
, PAGE_SIZE
, "%u\n", afu
->internal_lun
);
2327 * lun_mode_store() - sets the LUN mode of the host
2328 * @dev: Generic device associated with the host.
2329 * @attr: Device attribute representing the LUN mode.
2330 * @buf: Buffer of length PAGE_SIZE containing the LUN mode in ASCII.
2331 * @count: Length of data resizing in @buf.
2333 * The CXL Flash AFU supports a dummy LUN mode where the external
2334 * links and storage are not required. Space on the FPGA is used
2335 * to create 1 or 2 small LUNs which are presented to the system
2336 * as if they were a normal storage device. This feature is useful
2337 * during development and also provides manufacturing with a way
2338 * to test the AFU without an actual device.
2340 * 0 = external LUN[s] (default)
2341 * 1 = internal LUN (1 x 64K, 512B blocks, id 0)
2342 * 2 = internal LUN (1 x 64K, 4K blocks, id 0)
2343 * 3 = internal LUN (2 x 32K, 512B blocks, ids 0,1)
2344 * 4 = internal LUN (2 x 32K, 4K blocks, ids 0,1)
2346 * Return: The size of the ASCII string returned in @buf.
2348 static ssize_t
lun_mode_store(struct device
*dev
,
2349 struct device_attribute
*attr
,
2350 const char *buf
, size_t count
)
2352 struct Scsi_Host
*shost
= class_to_shost(dev
);
2353 struct cxlflash_cfg
*cfg
= shost_priv(shost
);
2354 struct afu
*afu
= cfg
->afu
;
2358 rc
= kstrtouint(buf
, 10, &lun_mode
);
2359 if (!rc
&& (lun_mode
< 5) && (lun_mode
!= afu
->internal_lun
)) {
2360 afu
->internal_lun
= lun_mode
;
2363 * When configured for internal LUN, there is only one channel,
2364 * channel number 0, else there will be one less than the number
2365 * of fc ports for this card.
2367 if (afu
->internal_lun
)
2368 shost
->max_channel
= 0;
2370 shost
->max_channel
= PORTNUM2CHAN(cfg
->num_fc_ports
);
2373 scsi_scan_host(cfg
->host
);
2380 * ioctl_version_show() - presents the current ioctl version of the host
2381 * @dev: Generic device associated with the host.
2382 * @attr: Device attribute representing the ioctl version.
2383 * @buf: Buffer of length PAGE_SIZE to report back the ioctl version.
2385 * Return: The size of the ASCII string returned in @buf.
2387 static ssize_t
ioctl_version_show(struct device
*dev
,
2388 struct device_attribute
*attr
, char *buf
)
2390 return scnprintf(buf
, PAGE_SIZE
, "%u\n", DK_CXLFLASH_VERSION_0
);
2394 * cxlflash_show_port_lun_table() - queries and presents the port LUN table
2395 * @port: Desired port for status reporting.
2396 * @cfg: Internal structure associated with the host.
2397 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
2399 * Return: The size of the ASCII string returned in @buf or -EINVAL.
2401 static ssize_t
cxlflash_show_port_lun_table(u32 port
,
2402 struct cxlflash_cfg
*cfg
,
2405 struct device
*dev
= &cfg
->dev
->dev
;
2406 __be64 __iomem
*fc_port_luns
;
2410 WARN_ON(port
>= MAX_FC_PORTS
);
2412 if (port
>= cfg
->num_fc_ports
) {
2413 dev_info(dev
, "%s: Port %d not supported on this card.\n",
2418 fc_port_luns
= get_fc_port_luns(cfg
, port
);
2420 for (i
= 0; i
< CXLFLASH_NUM_VLUNS
; i
++)
2421 bytes
+= scnprintf(buf
+ bytes
, PAGE_SIZE
- bytes
,
2423 i
, readq_be(&fc_port_luns
[i
]));
2428 * port0_lun_table_show() - presents the current LUN table of port 0
2429 * @dev: Generic device associated with the host owning the port.
2430 * @attr: Device attribute representing the port.
2431 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
2433 * Return: The size of the ASCII string returned in @buf.
2435 static ssize_t
port0_lun_table_show(struct device
*dev
,
2436 struct device_attribute
*attr
,
2439 struct cxlflash_cfg
*cfg
= shost_priv(class_to_shost(dev
));
2441 return cxlflash_show_port_lun_table(0, cfg
, buf
);
2445 * port1_lun_table_show() - presents the current LUN table of port 1
2446 * @dev: Generic device associated with the host owning the port.
2447 * @attr: Device attribute representing the port.
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.
2452 static ssize_t
port1_lun_table_show(struct device
*dev
,
2453 struct device_attribute
*attr
,
2456 struct cxlflash_cfg
*cfg
= shost_priv(class_to_shost(dev
));
2458 return cxlflash_show_port_lun_table(1, cfg
, buf
);
2462 * port2_lun_table_show() - presents the current LUN table of port 2
2463 * @dev: Generic device associated with the host owning the port.
2464 * @attr: Device attribute representing the port.
2465 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
2467 * Return: The size of the ASCII string returned in @buf.
2469 static ssize_t
port2_lun_table_show(struct device
*dev
,
2470 struct device_attribute
*attr
,
2473 struct cxlflash_cfg
*cfg
= shost_priv(class_to_shost(dev
));
2475 return cxlflash_show_port_lun_table(2, cfg
, buf
);
2479 * port3_lun_table_show() - presents the current LUN table of port 3
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
port3_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(3, cfg
, buf
);
2496 * irqpoll_weight_show() - presents the current IRQ poll weight for the host
2497 * @dev: Generic device associated with the host.
2498 * @attr: Device attribute representing the IRQ poll weight.
2499 * @buf: Buffer of length PAGE_SIZE to report back the current IRQ poll
2502 * An IRQ poll weight of 0 indicates polling is disabled.
2504 * Return: The size of the ASCII string returned in @buf.
2506 static ssize_t
irqpoll_weight_show(struct device
*dev
,
2507 struct device_attribute
*attr
, char *buf
)
2509 struct cxlflash_cfg
*cfg
= shost_priv(class_to_shost(dev
));
2510 struct afu
*afu
= cfg
->afu
;
2512 return scnprintf(buf
, PAGE_SIZE
, "%u\n", afu
->irqpoll_weight
);
2516 * irqpoll_weight_store() - sets the current IRQ poll weight for the host
2517 * @dev: Generic device associated with the host.
2518 * @attr: Device attribute representing the IRQ poll weight.
2519 * @buf: Buffer of length PAGE_SIZE containing the desired IRQ poll
2521 * @count: Length of data resizing in @buf.
2523 * An IRQ poll weight of 0 indicates polling is disabled.
2525 * Return: The size of the ASCII string returned in @buf.
2527 static ssize_t
irqpoll_weight_store(struct device
*dev
,
2528 struct device_attribute
*attr
,
2529 const char *buf
, size_t count
)
2531 struct cxlflash_cfg
*cfg
= shost_priv(class_to_shost(dev
));
2532 struct device
*cfgdev
= &cfg
->dev
->dev
;
2533 struct afu
*afu
= cfg
->afu
;
2538 rc
= kstrtouint(buf
, 10, &weight
);
2544 "Invalid IRQ poll weight. It must be 256 or less.\n");
2548 if (weight
== afu
->irqpoll_weight
) {
2550 "Current IRQ poll weight has the same weight.\n");
2554 if (afu_is_irqpoll_enabled(afu
)) {
2555 for (i
= 0; i
< afu
->num_hwqs
; i
++) {
2556 hwq
= get_hwq(afu
, i
);
2558 irq_poll_disable(&hwq
->irqpoll
);
2562 afu
->irqpoll_weight
= weight
;
2565 for (i
= 0; i
< afu
->num_hwqs
; i
++) {
2566 hwq
= get_hwq(afu
, i
);
2568 irq_poll_init(&hwq
->irqpoll
, weight
, cxlflash_irqpoll
);
2576 * num_hwqs_show() - presents the number of hardware queues for the host
2577 * @dev: Generic device associated with the host.
2578 * @attr: Device attribute representing the number of hardware queues.
2579 * @buf: Buffer of length PAGE_SIZE to report back the number of hardware
2582 * Return: The size of the ASCII string returned in @buf.
2584 static ssize_t
num_hwqs_show(struct device
*dev
,
2585 struct device_attribute
*attr
, char *buf
)
2587 struct cxlflash_cfg
*cfg
= shost_priv(class_to_shost(dev
));
2588 struct afu
*afu
= cfg
->afu
;
2590 return scnprintf(buf
, PAGE_SIZE
, "%u\n", afu
->num_hwqs
);
2594 * num_hwqs_store() - sets the number of hardware queues for the host
2595 * @dev: Generic device associated with the host.
2596 * @attr: Device attribute representing the number of hardware queues.
2597 * @buf: Buffer of length PAGE_SIZE containing the number of hardware
2599 * @count: Length of data resizing in @buf.
2601 * n > 0: num_hwqs = n
2602 * n = 0: num_hwqs = num_online_cpus()
2603 * n < 0: num_online_cpus() / abs(n)
2605 * Return: The size of the ASCII string returned in @buf.
2607 static ssize_t
num_hwqs_store(struct device
*dev
,
2608 struct device_attribute
*attr
,
2609 const char *buf
, size_t count
)
2611 struct cxlflash_cfg
*cfg
= shost_priv(class_to_shost(dev
));
2612 struct afu
*afu
= cfg
->afu
;
2614 int nhwqs
, num_hwqs
;
2616 rc
= kstrtoint(buf
, 10, &nhwqs
);
2622 else if (nhwqs
== 0)
2623 num_hwqs
= num_online_cpus();
2625 num_hwqs
= num_online_cpus() / abs(nhwqs
);
2627 afu
->desired_hwqs
= min(num_hwqs
, CXLFLASH_MAX_HWQS
);
2628 WARN_ON_ONCE(afu
->desired_hwqs
== 0);
2631 switch (cfg
->state
) {
2633 cfg
->state
= STATE_RESET
;
2635 cxlflash_mark_contexts_error(cfg
);
2636 rc
= afu_reset(cfg
);
2638 cfg
->state
= STATE_FAILTERM
;
2640 cfg
->state
= STATE_NORMAL
;
2641 wake_up_all(&cfg
->reset_waitq
);
2644 wait_event(cfg
->reset_waitq
, cfg
->state
!= STATE_RESET
);
2645 if (cfg
->state
== STATE_NORMAL
)
2648 /* Ideally should not happen */
2649 dev_err(dev
, "%s: Device is not ready, state=%d\n",
2650 __func__
, cfg
->state
);
2658 * mode_show() - presents the current mode of the device
2659 * @dev: Generic device associated with the device.
2660 * @attr: Device attribute representing the device mode.
2661 * @buf: Buffer of length PAGE_SIZE to report back the dev mode in ASCII.
2663 * Return: The size of the ASCII string returned in @buf.
2665 static ssize_t
mode_show(struct device
*dev
,
2666 struct device_attribute
*attr
, char *buf
)
2668 struct scsi_device
*sdev
= to_scsi_device(dev
);
2670 return scnprintf(buf
, PAGE_SIZE
, "%s\n",
2671 sdev
->hostdata
? "superpipe" : "legacy");
2677 static DEVICE_ATTR_RO(port0
);
2678 static DEVICE_ATTR_RO(port1
);
2679 static DEVICE_ATTR_RO(port2
);
2680 static DEVICE_ATTR_RO(port3
);
2681 static DEVICE_ATTR_RW(lun_mode
);
2682 static DEVICE_ATTR_RO(ioctl_version
);
2683 static DEVICE_ATTR_RO(port0_lun_table
);
2684 static DEVICE_ATTR_RO(port1_lun_table
);
2685 static DEVICE_ATTR_RO(port2_lun_table
);
2686 static DEVICE_ATTR_RO(port3_lun_table
);
2687 static DEVICE_ATTR_RW(irqpoll_weight
);
2688 static DEVICE_ATTR_RW(num_hwqs
);
2690 static struct device_attribute
*cxlflash_host_attrs
[] = {
2696 &dev_attr_ioctl_version
,
2697 &dev_attr_port0_lun_table
,
2698 &dev_attr_port1_lun_table
,
2699 &dev_attr_port2_lun_table
,
2700 &dev_attr_port3_lun_table
,
2701 &dev_attr_irqpoll_weight
,
2709 static DEVICE_ATTR_RO(mode
);
2711 static struct device_attribute
*cxlflash_dev_attrs
[] = {
2719 static struct scsi_host_template driver_template
= {
2720 .module
= THIS_MODULE
,
2721 .name
= CXLFLASH_ADAPTER_NAME
,
2722 .info
= cxlflash_driver_info
,
2723 .ioctl
= cxlflash_ioctl
,
2724 .proc_name
= CXLFLASH_NAME
,
2725 .queuecommand
= cxlflash_queuecommand
,
2726 .eh_device_reset_handler
= cxlflash_eh_device_reset_handler
,
2727 .eh_host_reset_handler
= cxlflash_eh_host_reset_handler
,
2728 .change_queue_depth
= cxlflash_change_queue_depth
,
2729 .cmd_per_lun
= CXLFLASH_MAX_CMDS_PER_LUN
,
2730 .can_queue
= CXLFLASH_MAX_CMDS
,
2731 .cmd_size
= sizeof(struct afu_cmd
) + __alignof__(struct afu_cmd
) - 1,
2733 .sg_tablesize
= 1, /* No scatter gather support */
2734 .max_sectors
= CXLFLASH_MAX_SECTORS
,
2735 .use_clustering
= ENABLE_CLUSTERING
,
2736 .shost_attrs
= cxlflash_host_attrs
,
2737 .sdev_attrs
= cxlflash_dev_attrs
,
2741 * Device dependent values
2743 static struct dev_dependent_vals dev_corsa_vals
= { CXLFLASH_MAX_SECTORS
,
2745 static struct dev_dependent_vals dev_flash_gt_vals
= { CXLFLASH_MAX_SECTORS
,
2746 CXLFLASH_NOTIFY_SHUTDOWN
};
2747 static struct dev_dependent_vals dev_briard_vals
= { CXLFLASH_MAX_SECTORS
,
2748 CXLFLASH_NOTIFY_SHUTDOWN
};
2751 * PCI device binding table
2753 static struct pci_device_id cxlflash_pci_table
[] = {
2754 {PCI_VENDOR_ID_IBM
, PCI_DEVICE_ID_IBM_CORSA
,
2755 PCI_ANY_ID
, PCI_ANY_ID
, 0, 0, (kernel_ulong_t
)&dev_corsa_vals
},
2756 {PCI_VENDOR_ID_IBM
, PCI_DEVICE_ID_IBM_FLASH_GT
,
2757 PCI_ANY_ID
, PCI_ANY_ID
, 0, 0, (kernel_ulong_t
)&dev_flash_gt_vals
},
2758 {PCI_VENDOR_ID_IBM
, PCI_DEVICE_ID_IBM_BRIARD
,
2759 PCI_ANY_ID
, PCI_ANY_ID
, 0, 0, (kernel_ulong_t
)&dev_briard_vals
},
2763 MODULE_DEVICE_TABLE(pci
, cxlflash_pci_table
);
2766 * cxlflash_worker_thread() - work thread handler for the AFU
2767 * @work: Work structure contained within cxlflash associated with host.
2769 * Handles the following events:
2770 * - Link reset which cannot be performed on interrupt context due to
2771 * blocking up to a few seconds
2774 static void cxlflash_worker_thread(struct work_struct
*work
)
2776 struct cxlflash_cfg
*cfg
= container_of(work
, struct cxlflash_cfg
,
2778 struct afu
*afu
= cfg
->afu
;
2779 struct device
*dev
= &cfg
->dev
->dev
;
2780 __be64 __iomem
*fc_port_regs
;
2784 /* Avoid MMIO if the device has failed */
2786 if (cfg
->state
!= STATE_NORMAL
)
2789 spin_lock_irqsave(cfg
->host
->host_lock
, lock_flags
);
2791 if (cfg
->lr_state
== LINK_RESET_REQUIRED
) {
2792 port
= cfg
->lr_port
;
2794 dev_err(dev
, "%s: invalid port index %d\n",
2797 spin_unlock_irqrestore(cfg
->host
->host_lock
,
2800 /* The reset can block... */
2801 fc_port_regs
= get_fc_port_regs(cfg
, port
);
2802 afu_link_reset(afu
, port
, fc_port_regs
);
2803 spin_lock_irqsave(cfg
->host
->host_lock
, lock_flags
);
2806 cfg
->lr_state
= LINK_RESET_COMPLETE
;
2809 spin_unlock_irqrestore(cfg
->host
->host_lock
, lock_flags
);
2811 if (atomic_dec_if_positive(&cfg
->scan_host_needed
) >= 0)
2812 scsi_scan_host(cfg
->host
);
2816 * cxlflash_probe() - PCI entry point to add host
2817 * @pdev: PCI device associated with the host.
2818 * @dev_id: PCI device id associated with device.
2820 * The device will initially start out in a 'probing' state and
2821 * transition to the 'normal' state at the end of a successful
2822 * probe. Should an EEH event occur during probe, the notification
2823 * thread (error_detected()) will wait until the probe handler
2824 * is nearly complete. At that time, the device will be moved to
2825 * a 'probed' state and the EEH thread woken up to drive the slot
2826 * reset and recovery (device moves to 'normal' state). Meanwhile,
2827 * the probe will be allowed to exit successfully.
2829 * Return: 0 on success, -errno on failure
2831 static int cxlflash_probe(struct pci_dev
*pdev
,
2832 const struct pci_device_id
*dev_id
)
2834 struct Scsi_Host
*host
;
2835 struct cxlflash_cfg
*cfg
= NULL
;
2836 struct device
*dev
= &pdev
->dev
;
2837 struct dev_dependent_vals
*ddv
;
2841 dev_dbg(&pdev
->dev
, "%s: Found CXLFLASH with IRQ: %d\n",
2842 __func__
, pdev
->irq
);
2844 ddv
= (struct dev_dependent_vals
*)dev_id
->driver_data
;
2845 driver_template
.max_sectors
= ddv
->max_sectors
;
2847 host
= scsi_host_alloc(&driver_template
, sizeof(struct cxlflash_cfg
));
2849 dev_err(dev
, "%s: scsi_host_alloc failed\n", __func__
);
2854 host
->max_id
= CXLFLASH_MAX_NUM_TARGETS_PER_BUS
;
2855 host
->max_lun
= CXLFLASH_MAX_NUM_LUNS_PER_TARGET
;
2856 host
->unique_id
= host
->host_no
;
2857 host
->max_cmd_len
= CXLFLASH_MAX_CDB_LEN
;
2859 cfg
= shost_priv(host
);
2861 rc
= alloc_mem(cfg
);
2863 dev_err(dev
, "%s: alloc_mem failed\n", __func__
);
2865 scsi_host_put(cfg
->host
);
2869 cfg
->init_state
= INIT_STATE_NONE
;
2871 cfg
->cxl_fops
= cxlflash_cxl_fops
;
2874 * Promoted LUNs move to the top of the LUN table. The rest stay on
2875 * the bottom half. The bottom half grows from the end (index = 255),
2876 * whereas the top half grows from the beginning (index = 0).
2878 * Initialize the last LUN index for all possible ports.
2880 cfg
->promote_lun_index
= 0;
2882 for (k
= 0; k
< MAX_FC_PORTS
; k
++)
2883 cfg
->last_lun_index
[k
] = CXLFLASH_NUM_VLUNS
/2 - 1;
2885 cfg
->dev_id
= (struct pci_device_id
*)dev_id
;
2887 init_waitqueue_head(&cfg
->tmf_waitq
);
2888 init_waitqueue_head(&cfg
->reset_waitq
);
2890 INIT_WORK(&cfg
->work_q
, cxlflash_worker_thread
);
2891 cfg
->lr_state
= LINK_RESET_INVALID
;
2893 spin_lock_init(&cfg
->tmf_slock
);
2894 mutex_init(&cfg
->ctx_tbl_list_mutex
);
2895 mutex_init(&cfg
->ctx_recovery_mutex
);
2896 init_rwsem(&cfg
->ioctl_rwsem
);
2897 INIT_LIST_HEAD(&cfg
->ctx_err_recovery
);
2898 INIT_LIST_HEAD(&cfg
->lluns
);
2900 pci_set_drvdata(pdev
, cfg
);
2902 cfg
->cxl_afu
= cxl_pci_to_afu(pdev
);
2906 dev_err(dev
, "%s: init_pci failed rc=%d\n", __func__
, rc
);
2909 cfg
->init_state
= INIT_STATE_PCI
;
2912 if (rc
&& !wq_has_sleeper(&cfg
->reset_waitq
)) {
2913 dev_err(dev
, "%s: init_afu failed rc=%d\n", __func__
, rc
);
2916 cfg
->init_state
= INIT_STATE_AFU
;
2918 rc
= init_scsi(cfg
);
2920 dev_err(dev
, "%s: init_scsi failed rc=%d\n", __func__
, rc
);
2923 cfg
->init_state
= INIT_STATE_SCSI
;
2925 if (wq_has_sleeper(&cfg
->reset_waitq
)) {
2926 cfg
->state
= STATE_PROBED
;
2927 wake_up_all(&cfg
->reset_waitq
);
2929 cfg
->state
= STATE_NORMAL
;
2931 dev_dbg(dev
, "%s: returning rc=%d\n", __func__
, rc
);
2935 cxlflash_remove(pdev
);
2940 * cxlflash_pci_error_detected() - called when a PCI error is detected
2941 * @pdev: PCI device struct.
2942 * @state: PCI channel state.
2944 * When an EEH occurs during an active reset, wait until the reset is
2945 * complete and then take action based upon the device state.
2947 * Return: PCI_ERS_RESULT_NEED_RESET or PCI_ERS_RESULT_DISCONNECT
2949 static pci_ers_result_t
cxlflash_pci_error_detected(struct pci_dev
*pdev
,
2950 pci_channel_state_t state
)
2953 struct cxlflash_cfg
*cfg
= pci_get_drvdata(pdev
);
2954 struct device
*dev
= &cfg
->dev
->dev
;
2956 dev_dbg(dev
, "%s: pdev=%p state=%u\n", __func__
, pdev
, state
);
2959 case pci_channel_io_frozen
:
2960 wait_event(cfg
->reset_waitq
, cfg
->state
!= STATE_RESET
&&
2961 cfg
->state
!= STATE_PROBING
);
2962 if (cfg
->state
== STATE_FAILTERM
)
2963 return PCI_ERS_RESULT_DISCONNECT
;
2965 cfg
->state
= STATE_RESET
;
2966 scsi_block_requests(cfg
->host
);
2968 rc
= cxlflash_mark_contexts_error(cfg
);
2970 dev_err(dev
, "%s: Failed to mark user contexts rc=%d\n",
2973 return PCI_ERS_RESULT_NEED_RESET
;
2974 case pci_channel_io_perm_failure
:
2975 cfg
->state
= STATE_FAILTERM
;
2976 wake_up_all(&cfg
->reset_waitq
);
2977 scsi_unblock_requests(cfg
->host
);
2978 return PCI_ERS_RESULT_DISCONNECT
;
2982 return PCI_ERS_RESULT_NEED_RESET
;
2986 * cxlflash_pci_slot_reset() - called when PCI slot has been reset
2987 * @pdev: PCI device struct.
2989 * This routine is called by the pci error recovery code after the PCI
2990 * slot has been reset, just before we should resume normal operations.
2992 * Return: PCI_ERS_RESULT_RECOVERED or PCI_ERS_RESULT_DISCONNECT
2994 static pci_ers_result_t
cxlflash_pci_slot_reset(struct pci_dev
*pdev
)
2997 struct cxlflash_cfg
*cfg
= pci_get_drvdata(pdev
);
2998 struct device
*dev
= &cfg
->dev
->dev
;
3000 dev_dbg(dev
, "%s: pdev=%p\n", __func__
, pdev
);
3004 dev_err(dev
, "%s: EEH recovery failed rc=%d\n", __func__
, rc
);
3005 return PCI_ERS_RESULT_DISCONNECT
;
3008 return PCI_ERS_RESULT_RECOVERED
;
3012 * cxlflash_pci_resume() - called when normal operation can resume
3013 * @pdev: PCI device struct
3015 static void cxlflash_pci_resume(struct pci_dev
*pdev
)
3017 struct cxlflash_cfg
*cfg
= pci_get_drvdata(pdev
);
3018 struct device
*dev
= &cfg
->dev
->dev
;
3020 dev_dbg(dev
, "%s: pdev=%p\n", __func__
, pdev
);
3022 cfg
->state
= STATE_NORMAL
;
3023 wake_up_all(&cfg
->reset_waitq
);
3024 scsi_unblock_requests(cfg
->host
);
3027 static const struct pci_error_handlers cxlflash_err_handler
= {
3028 .error_detected
= cxlflash_pci_error_detected
,
3029 .slot_reset
= cxlflash_pci_slot_reset
,
3030 .resume
= cxlflash_pci_resume
,
3034 * PCI device structure
3036 static struct pci_driver cxlflash_driver
= {
3037 .name
= CXLFLASH_NAME
,
3038 .id_table
= cxlflash_pci_table
,
3039 .probe
= cxlflash_probe
,
3040 .remove
= cxlflash_remove
,
3041 .shutdown
= cxlflash_remove
,
3042 .err_handler
= &cxlflash_err_handler
,
3046 * init_cxlflash() - module entry point
3048 * Return: 0 on success, -errno on failure
3050 static int __init
init_cxlflash(void)
3053 cxlflash_list_init();
3055 return pci_register_driver(&cxlflash_driver
);
3059 * exit_cxlflash() - module exit point
3061 static void __exit
exit_cxlflash(void)
3063 cxlflash_term_global_luns();
3064 cxlflash_free_errpage();
3066 pci_unregister_driver(&cxlflash_driver
);
3069 module_init(init_cxlflash
);
3070 module_exit(exit_cxlflash
);