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
< CXLFLASH_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
= CXLFLASH_NUM_HWQS
- 1; k
>= 0; k
--)
680 term_intr(cfg
, UNMAP_THREE
, k
);
685 for (k
= CXLFLASH_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
->afu_map
= NULL
;
832 * init_pci() - initializes the host as a PCI device
833 * @cfg: Internal structure associated with the host.
835 * Return: 0 on success, -errno on failure
837 static int init_pci(struct cxlflash_cfg
*cfg
)
839 struct pci_dev
*pdev
= cfg
->dev
;
840 struct device
*dev
= &cfg
->dev
->dev
;
843 rc
= pci_enable_device(pdev
);
844 if (rc
|| pci_channel_offline(pdev
)) {
845 if (pci_channel_offline(pdev
)) {
846 cxlflash_wait_for_pci_err_recovery(cfg
);
847 rc
= pci_enable_device(pdev
);
851 dev_err(dev
, "%s: Cannot enable adapter\n", __func__
);
852 cxlflash_wait_for_pci_err_recovery(cfg
);
858 dev_dbg(dev
, "%s: returning rc=%d\n", __func__
, rc
);
863 * init_scsi() - adds the host to the SCSI stack and kicks off host scan
864 * @cfg: Internal structure associated with the host.
866 * Return: 0 on success, -errno on failure
868 static int init_scsi(struct cxlflash_cfg
*cfg
)
870 struct pci_dev
*pdev
= cfg
->dev
;
871 struct device
*dev
= &cfg
->dev
->dev
;
874 rc
= scsi_add_host(cfg
->host
, &pdev
->dev
);
876 dev_err(dev
, "%s: scsi_add_host failed rc=%d\n", __func__
, rc
);
880 scsi_scan_host(cfg
->host
);
883 dev_dbg(dev
, "%s: returning rc=%d\n", __func__
, rc
);
888 * set_port_online() - transitions the specified host FC port to online state
889 * @fc_regs: Top of MMIO region defined for specified port.
891 * The provided MMIO region must be mapped prior to call. Online state means
892 * that the FC link layer has synced, completed the handshaking process, and
893 * is ready for login to start.
895 static void set_port_online(__be64 __iomem
*fc_regs
)
899 cmdcfg
= readq_be(&fc_regs
[FC_MTIP_CMDCONFIG
/ 8]);
900 cmdcfg
&= (~FC_MTIP_CMDCONFIG_OFFLINE
); /* clear OFF_LINE */
901 cmdcfg
|= (FC_MTIP_CMDCONFIG_ONLINE
); /* set ON_LINE */
902 writeq_be(cmdcfg
, &fc_regs
[FC_MTIP_CMDCONFIG
/ 8]);
906 * set_port_offline() - transitions the specified host FC port to offline state
907 * @fc_regs: Top of MMIO region defined for specified port.
909 * The provided MMIO region must be mapped prior to call.
911 static void set_port_offline(__be64 __iomem
*fc_regs
)
915 cmdcfg
= readq_be(&fc_regs
[FC_MTIP_CMDCONFIG
/ 8]);
916 cmdcfg
&= (~FC_MTIP_CMDCONFIG_ONLINE
); /* clear ON_LINE */
917 cmdcfg
|= (FC_MTIP_CMDCONFIG_OFFLINE
); /* set OFF_LINE */
918 writeq_be(cmdcfg
, &fc_regs
[FC_MTIP_CMDCONFIG
/ 8]);
922 * wait_port_online() - waits for the specified host FC port come online
923 * @fc_regs: Top of MMIO region defined for specified port.
924 * @delay_us: Number of microseconds to delay between reading port status.
925 * @nretry: Number of cycles to retry reading port status.
927 * The provided MMIO region must be mapped prior to call. This will timeout
928 * when the cable is not plugged in.
931 * TRUE (1) when the specified port is online
932 * FALSE (0) when the specified port fails to come online after timeout
934 static bool wait_port_online(__be64 __iomem
*fc_regs
, u32 delay_us
, u32 nretry
)
938 WARN_ON(delay_us
< 1000);
941 msleep(delay_us
/ 1000);
942 status
= readq_be(&fc_regs
[FC_MTIP_STATUS
/ 8]);
943 if (status
== U64_MAX
)
945 } while ((status
& FC_MTIP_STATUS_MASK
) != FC_MTIP_STATUS_ONLINE
&&
948 return ((status
& FC_MTIP_STATUS_MASK
) == FC_MTIP_STATUS_ONLINE
);
952 * wait_port_offline() - waits for the specified host FC port go offline
953 * @fc_regs: Top of MMIO region defined for specified port.
954 * @delay_us: Number of microseconds to delay between reading port status.
955 * @nretry: Number of cycles to retry reading port status.
957 * The provided MMIO region must be mapped prior to call.
960 * TRUE (1) when the specified port is offline
961 * FALSE (0) when the specified port fails to go offline after timeout
963 static bool wait_port_offline(__be64 __iomem
*fc_regs
, u32 delay_us
, u32 nretry
)
967 WARN_ON(delay_us
< 1000);
970 msleep(delay_us
/ 1000);
971 status
= readq_be(&fc_regs
[FC_MTIP_STATUS
/ 8]);
972 if (status
== U64_MAX
)
974 } while ((status
& FC_MTIP_STATUS_MASK
) != FC_MTIP_STATUS_OFFLINE
&&
977 return ((status
& FC_MTIP_STATUS_MASK
) == FC_MTIP_STATUS_OFFLINE
);
981 * afu_set_wwpn() - configures the WWPN for the specified host FC port
982 * @afu: AFU associated with the host that owns the specified FC port.
983 * @port: Port number being configured.
984 * @fc_regs: Top of MMIO region defined for specified port.
985 * @wwpn: The world-wide-port-number previously discovered for port.
987 * The provided MMIO region must be mapped prior to call. As part of the
988 * sequence to configure the WWPN, the port is toggled offline and then back
989 * online. This toggling action can cause this routine to delay up to a few
990 * seconds. When configured to use the internal LUN feature of the AFU, a
991 * failure to come online is overridden.
993 static void afu_set_wwpn(struct afu
*afu
, int port
, __be64 __iomem
*fc_regs
,
996 struct cxlflash_cfg
*cfg
= afu
->parent
;
997 struct device
*dev
= &cfg
->dev
->dev
;
999 set_port_offline(fc_regs
);
1000 if (!wait_port_offline(fc_regs
, FC_PORT_STATUS_RETRY_INTERVAL_US
,
1001 FC_PORT_STATUS_RETRY_CNT
)) {
1002 dev_dbg(dev
, "%s: wait on port %d to go offline timed out\n",
1006 writeq_be(wwpn
, &fc_regs
[FC_PNAME
/ 8]);
1008 set_port_online(fc_regs
);
1009 if (!wait_port_online(fc_regs
, FC_PORT_STATUS_RETRY_INTERVAL_US
,
1010 FC_PORT_STATUS_RETRY_CNT
)) {
1011 dev_dbg(dev
, "%s: wait on port %d to go online timed out\n",
1017 * afu_link_reset() - resets the specified host FC port
1018 * @afu: AFU associated with the host that owns the specified FC port.
1019 * @port: Port number being configured.
1020 * @fc_regs: Top of MMIO region defined for specified port.
1022 * The provided MMIO region must be mapped prior to call. The sequence to
1023 * reset the port involves toggling it offline and then back online. This
1024 * action can cause this routine to delay up to a few seconds. An effort
1025 * is made to maintain link with the device by switching to host to use
1026 * the alternate port exclusively while the reset takes place.
1027 * failure to come online is overridden.
1029 static void afu_link_reset(struct afu
*afu
, int port
, __be64 __iomem
*fc_regs
)
1031 struct cxlflash_cfg
*cfg
= afu
->parent
;
1032 struct device
*dev
= &cfg
->dev
->dev
;
1035 /* first switch the AFU to the other links, if any */
1036 port_sel
= readq_be(&afu
->afu_map
->global
.regs
.afu_port_sel
);
1037 port_sel
&= ~(1ULL << port
);
1038 writeq_be(port_sel
, &afu
->afu_map
->global
.regs
.afu_port_sel
);
1039 cxlflash_afu_sync(afu
, 0, 0, AFU_GSYNC
);
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_err(dev
, "%s: wait on port %d to go offline timed out\n",
1047 set_port_online(fc_regs
);
1048 if (!wait_port_online(fc_regs
, FC_PORT_STATUS_RETRY_INTERVAL_US
,
1049 FC_PORT_STATUS_RETRY_CNT
))
1050 dev_err(dev
, "%s: wait on port %d to go online timed out\n",
1053 /* switch back to include this port */
1054 port_sel
|= (1ULL << port
);
1055 writeq_be(port_sel
, &afu
->afu_map
->global
.regs
.afu_port_sel
);
1056 cxlflash_afu_sync(afu
, 0, 0, AFU_GSYNC
);
1058 dev_dbg(dev
, "%s: returning port_sel=%016llx\n", __func__
, port_sel
);
1062 * afu_err_intr_init() - clears and initializes the AFU for error interrupts
1063 * @afu: AFU associated with the host.
1065 static void afu_err_intr_init(struct afu
*afu
)
1067 struct cxlflash_cfg
*cfg
= afu
->parent
;
1068 __be64 __iomem
*fc_port_regs
;
1070 struct hwq
*hwq
= get_hwq(afu
, PRIMARY_HWQ
);
1073 /* global async interrupts: AFU clears afu_ctrl on context exit
1074 * if async interrupts were sent to that context. This prevents
1075 * the AFU form sending further async interrupts when
1077 * nobody to receive them.
1081 writeq_be(-1ULL, &afu
->afu_map
->global
.regs
.aintr_mask
);
1082 /* set LISN# to send and point to primary master context */
1083 reg
= ((u64
) (((hwq
->ctx_hndl
<< 8) | SISL_MSI_ASYNC_ERROR
)) << 40);
1085 if (afu
->internal_lun
)
1086 reg
|= 1; /* Bit 63 indicates local lun */
1087 writeq_be(reg
, &afu
->afu_map
->global
.regs
.afu_ctrl
);
1089 writeq_be(-1ULL, &afu
->afu_map
->global
.regs
.aintr_clear
);
1090 /* unmask bits that are of interest */
1091 /* note: afu can send an interrupt after this step */
1092 writeq_be(SISL_ASTATUS_MASK
, &afu
->afu_map
->global
.regs
.aintr_mask
);
1093 /* clear again in case a bit came on after previous clear but before */
1095 writeq_be(-1ULL, &afu
->afu_map
->global
.regs
.aintr_clear
);
1097 /* Clear/Set internal lun bits */
1098 fc_port_regs
= get_fc_port_regs(cfg
, 0);
1099 reg
= readq_be(&fc_port_regs
[FC_CONFIG2
/ 8]);
1100 reg
&= SISL_FC_INTERNAL_MASK
;
1101 if (afu
->internal_lun
)
1102 reg
|= ((u64
)(afu
->internal_lun
- 1) << SISL_FC_INTERNAL_SHIFT
);
1103 writeq_be(reg
, &fc_port_regs
[FC_CONFIG2
/ 8]);
1105 /* now clear FC errors */
1106 for (i
= 0; i
< cfg
->num_fc_ports
; i
++) {
1107 fc_port_regs
= get_fc_port_regs(cfg
, i
);
1109 writeq_be(0xFFFFFFFFU
, &fc_port_regs
[FC_ERROR
/ 8]);
1110 writeq_be(0, &fc_port_regs
[FC_ERRCAP
/ 8]);
1113 /* sync interrupts for master's IOARRIN write */
1114 /* note that unlike asyncs, there can be no pending sync interrupts */
1115 /* at this time (this is a fresh context and master has not written */
1116 /* IOARRIN yet), so there is nothing to clear. */
1118 /* set LISN#, it is always sent to the context that wrote IOARRIN */
1119 for (i
= 0; i
< CXLFLASH_NUM_HWQS
; i
++) {
1120 hwq
= get_hwq(afu
, i
);
1122 writeq_be(SISL_MSI_SYNC_ERROR
, &hwq
->host_map
->ctx_ctrl
);
1123 writeq_be(SISL_ISTATUS_MASK
, &hwq
->host_map
->intr_mask
);
1128 * cxlflash_sync_err_irq() - interrupt handler for synchronous errors
1129 * @irq: Interrupt number.
1130 * @data: Private data provided at interrupt registration, the AFU.
1132 * Return: Always return IRQ_HANDLED.
1134 static irqreturn_t
cxlflash_sync_err_irq(int irq
, void *data
)
1136 struct hwq
*hwq
= (struct hwq
*)data
;
1137 struct cxlflash_cfg
*cfg
= hwq
->afu
->parent
;
1138 struct device
*dev
= &cfg
->dev
->dev
;
1142 reg
= readq_be(&hwq
->host_map
->intr_status
);
1143 reg_unmasked
= (reg
& SISL_ISTATUS_UNMASK
);
1145 if (reg_unmasked
== 0UL) {
1146 dev_err(dev
, "%s: spurious interrupt, intr_status=%016llx\n",
1148 goto cxlflash_sync_err_irq_exit
;
1151 dev_err(dev
, "%s: unexpected interrupt, intr_status=%016llx\n",
1154 writeq_be(reg_unmasked
, &hwq
->host_map
->intr_clear
);
1156 cxlflash_sync_err_irq_exit
:
1161 * process_hrrq() - process the read-response queue
1162 * @afu: AFU associated with the host.
1163 * @doneq: Queue of commands harvested from the RRQ.
1164 * @budget: Threshold of RRQ entries to process.
1166 * This routine must be called holding the disabled RRQ spin lock.
1168 * Return: The number of entries processed.
1170 static int process_hrrq(struct hwq
*hwq
, struct list_head
*doneq
, int budget
)
1172 struct afu
*afu
= hwq
->afu
;
1173 struct afu_cmd
*cmd
;
1174 struct sisl_ioasa
*ioasa
;
1175 struct sisl_ioarcb
*ioarcb
;
1176 bool toggle
= hwq
->toggle
;
1179 *hrrq_start
= hwq
->hrrq_start
,
1180 *hrrq_end
= hwq
->hrrq_end
,
1181 *hrrq_curr
= hwq
->hrrq_curr
;
1183 /* Process ready RRQ entries up to the specified budget (if any) */
1187 if ((entry
& SISL_RESP_HANDLE_T_BIT
) != toggle
)
1190 entry
&= ~SISL_RESP_HANDLE_T_BIT
;
1192 if (afu_is_sq_cmd_mode(afu
)) {
1193 ioasa
= (struct sisl_ioasa
*)entry
;
1194 cmd
= container_of(ioasa
, struct afu_cmd
, sa
);
1196 ioarcb
= (struct sisl_ioarcb
*)entry
;
1197 cmd
= container_of(ioarcb
, struct afu_cmd
, rcb
);
1200 list_add_tail(&cmd
->queue
, doneq
);
1202 /* Advance to next entry or wrap and flip the toggle bit */
1203 if (hrrq_curr
< hrrq_end
)
1206 hrrq_curr
= hrrq_start
;
1207 toggle
^= SISL_RESP_HANDLE_T_BIT
;
1210 atomic_inc(&hwq
->hsq_credits
);
1213 if (budget
> 0 && num_hrrq
>= budget
)
1217 hwq
->hrrq_curr
= hrrq_curr
;
1218 hwq
->toggle
= toggle
;
1224 * process_cmd_doneq() - process a queue of harvested RRQ commands
1225 * @doneq: Queue of completed commands.
1227 * Note that upon return the queue can no longer be trusted.
1229 static void process_cmd_doneq(struct list_head
*doneq
)
1231 struct afu_cmd
*cmd
, *tmp
;
1233 WARN_ON(list_empty(doneq
));
1235 list_for_each_entry_safe(cmd
, tmp
, doneq
, queue
)
1240 * cxlflash_irqpoll() - process a queue of harvested RRQ commands
1241 * @irqpoll: IRQ poll structure associated with queue to poll.
1242 * @budget: Threshold of RRQ entries to process per poll.
1244 * Return: The number of entries processed.
1246 static int cxlflash_irqpoll(struct irq_poll
*irqpoll
, int budget
)
1248 struct hwq
*hwq
= container_of(irqpoll
, struct hwq
, irqpoll
);
1249 unsigned long hrrq_flags
;
1251 int num_entries
= 0;
1253 spin_lock_irqsave(&hwq
->hrrq_slock
, hrrq_flags
);
1255 num_entries
= process_hrrq(hwq
, &doneq
, budget
);
1256 if (num_entries
< budget
)
1257 irq_poll_complete(irqpoll
);
1259 spin_unlock_irqrestore(&hwq
->hrrq_slock
, hrrq_flags
);
1261 process_cmd_doneq(&doneq
);
1266 * cxlflash_rrq_irq() - interrupt handler for read-response queue (normal path)
1267 * @irq: Interrupt number.
1268 * @data: Private data provided at interrupt registration, the AFU.
1270 * Return: IRQ_HANDLED or IRQ_NONE when no ready entries found.
1272 static irqreturn_t
cxlflash_rrq_irq(int irq
, void *data
)
1274 struct hwq
*hwq
= (struct hwq
*)data
;
1275 struct afu
*afu
= hwq
->afu
;
1276 unsigned long hrrq_flags
;
1278 int num_entries
= 0;
1280 spin_lock_irqsave(&hwq
->hrrq_slock
, hrrq_flags
);
1282 if (afu_is_irqpoll_enabled(afu
)) {
1283 irq_poll_sched(&hwq
->irqpoll
);
1284 spin_unlock_irqrestore(&hwq
->hrrq_slock
, hrrq_flags
);
1288 num_entries
= process_hrrq(hwq
, &doneq
, -1);
1289 spin_unlock_irqrestore(&hwq
->hrrq_slock
, hrrq_flags
);
1291 if (num_entries
== 0)
1294 process_cmd_doneq(&doneq
);
1299 * Asynchronous interrupt information table
1302 * - Order matters here as this array is indexed by bit position.
1304 * - The checkpatch script considers the BUILD_SISL_ASTATUS_FC_PORT macro
1305 * as complex and complains due to a lack of parentheses/braces.
1307 #define ASTATUS_FC(_a, _b, _c, _d) \
1308 { SISL_ASTATUS_FC##_a##_##_b, _c, _a, (_d) }
1310 #define BUILD_SISL_ASTATUS_FC_PORT(_a) \
1311 ASTATUS_FC(_a, LINK_UP, "link up", 0), \
1312 ASTATUS_FC(_a, LINK_DN, "link down", 0), \
1313 ASTATUS_FC(_a, LOGI_S, "login succeeded", SCAN_HOST), \
1314 ASTATUS_FC(_a, LOGI_F, "login failed", CLR_FC_ERROR), \
1315 ASTATUS_FC(_a, LOGI_R, "login timed out, retrying", LINK_RESET), \
1316 ASTATUS_FC(_a, CRC_T, "CRC threshold exceeded", LINK_RESET), \
1317 ASTATUS_FC(_a, LOGO, "target initiated LOGO", 0), \
1318 ASTATUS_FC(_a, OTHER, "other error", CLR_FC_ERROR | LINK_RESET)
1320 static const struct asyc_intr_info ainfo
[] = {
1321 BUILD_SISL_ASTATUS_FC_PORT(1),
1322 BUILD_SISL_ASTATUS_FC_PORT(0),
1323 BUILD_SISL_ASTATUS_FC_PORT(3),
1324 BUILD_SISL_ASTATUS_FC_PORT(2)
1328 * cxlflash_async_err_irq() - interrupt handler for asynchronous errors
1329 * @irq: Interrupt number.
1330 * @data: Private data provided at interrupt registration, the AFU.
1332 * Return: Always return IRQ_HANDLED.
1334 static irqreturn_t
cxlflash_async_err_irq(int irq
, void *data
)
1336 struct hwq
*hwq
= (struct hwq
*)data
;
1337 struct afu
*afu
= hwq
->afu
;
1338 struct cxlflash_cfg
*cfg
= afu
->parent
;
1339 struct device
*dev
= &cfg
->dev
->dev
;
1340 const struct asyc_intr_info
*info
;
1341 struct sisl_global_map __iomem
*global
= &afu
->afu_map
->global
;
1342 __be64 __iomem
*fc_port_regs
;
1348 reg
= readq_be(&global
->regs
.aintr_status
);
1349 reg_unmasked
= (reg
& SISL_ASTATUS_UNMASK
);
1351 if (unlikely(reg_unmasked
== 0)) {
1352 dev_err(dev
, "%s: spurious interrupt, aintr_status=%016llx\n",
1357 /* FYI, it is 'okay' to clear AFU status before FC_ERROR */
1358 writeq_be(reg_unmasked
, &global
->regs
.aintr_clear
);
1360 /* Check each bit that is on */
1361 for_each_set_bit(bit
, (ulong
*)®_unmasked
, BITS_PER_LONG
) {
1362 if (unlikely(bit
>= ARRAY_SIZE(ainfo
))) {
1368 if (unlikely(info
->status
!= 1ULL << bit
)) {
1374 fc_port_regs
= get_fc_port_regs(cfg
, port
);
1376 dev_err(dev
, "%s: FC Port %d -> %s, fc_status=%016llx\n",
1377 __func__
, port
, info
->desc
,
1378 readq_be(&fc_port_regs
[FC_STATUS
/ 8]));
1381 * Do link reset first, some OTHER errors will set FC_ERROR
1382 * again if cleared before or w/o a reset
1384 if (info
->action
& LINK_RESET
) {
1385 dev_err(dev
, "%s: FC Port %d: resetting link\n",
1387 cfg
->lr_state
= LINK_RESET_REQUIRED
;
1388 cfg
->lr_port
= port
;
1389 schedule_work(&cfg
->work_q
);
1392 if (info
->action
& CLR_FC_ERROR
) {
1393 reg
= readq_be(&fc_port_regs
[FC_ERROR
/ 8]);
1396 * Since all errors are unmasked, FC_ERROR and FC_ERRCAP
1397 * should be the same and tracing one is sufficient.
1400 dev_err(dev
, "%s: fc %d: clearing fc_error=%016llx\n",
1401 __func__
, port
, reg
);
1403 writeq_be(reg
, &fc_port_regs
[FC_ERROR
/ 8]);
1404 writeq_be(0, &fc_port_regs
[FC_ERRCAP
/ 8]);
1407 if (info
->action
& SCAN_HOST
) {
1408 atomic_inc(&cfg
->scan_host_needed
);
1409 schedule_work(&cfg
->work_q
);
1418 * start_context() - starts the master context
1419 * @cfg: Internal structure associated with the host.
1420 * @index: Index of the hardware queue.
1422 * Return: A success or failure value from CXL services.
1424 static int start_context(struct cxlflash_cfg
*cfg
, u32 index
)
1426 struct device
*dev
= &cfg
->dev
->dev
;
1427 struct hwq
*hwq
= get_hwq(cfg
->afu
, index
);
1430 rc
= cxl_start_context(hwq
->ctx
,
1431 hwq
->work
.work_element_descriptor
,
1434 dev_dbg(dev
, "%s: returning rc=%d\n", __func__
, rc
);
1439 * read_vpd() - obtains the WWPNs from VPD
1440 * @cfg: Internal structure associated with the host.
1441 * @wwpn: Array of size MAX_FC_PORTS to pass back WWPNs
1443 * Return: 0 on success, -errno on failure
1445 static int read_vpd(struct cxlflash_cfg
*cfg
, u64 wwpn
[])
1447 struct device
*dev
= &cfg
->dev
->dev
;
1448 struct pci_dev
*pdev
= cfg
->dev
;
1450 int ro_start
, ro_size
, i
, j
, k
;
1452 char vpd_data
[CXLFLASH_VPD_LEN
];
1453 char tmp_buf
[WWPN_BUF_LEN
] = { 0 };
1454 char *wwpn_vpd_tags
[MAX_FC_PORTS
] = { "V5", "V6", "V7", "V8" };
1456 /* Get the VPD data from the device */
1457 vpd_size
= cxl_read_adapter_vpd(pdev
, vpd_data
, sizeof(vpd_data
));
1458 if (unlikely(vpd_size
<= 0)) {
1459 dev_err(dev
, "%s: Unable to read VPD (size = %ld)\n",
1460 __func__
, vpd_size
);
1465 /* Get the read only section offset */
1466 ro_start
= pci_vpd_find_tag(vpd_data
, 0, vpd_size
,
1467 PCI_VPD_LRDT_RO_DATA
);
1468 if (unlikely(ro_start
< 0)) {
1469 dev_err(dev
, "%s: VPD Read-only data not found\n", __func__
);
1474 /* Get the read only section size, cap when extends beyond read VPD */
1475 ro_size
= pci_vpd_lrdt_size(&vpd_data
[ro_start
]);
1477 i
= ro_start
+ PCI_VPD_LRDT_TAG_SIZE
;
1478 if (unlikely((i
+ j
) > vpd_size
)) {
1479 dev_dbg(dev
, "%s: Might need to read more VPD (%d > %ld)\n",
1480 __func__
, (i
+ j
), vpd_size
);
1481 ro_size
= vpd_size
- i
;
1485 * Find the offset of the WWPN tag within the read only
1486 * VPD data and validate the found field (partials are
1487 * no good to us). Convert the ASCII data to an integer
1488 * value. Note that we must copy to a temporary buffer
1489 * because the conversion service requires that the ASCII
1490 * string be terminated.
1492 for (k
= 0; k
< cfg
->num_fc_ports
; k
++) {
1494 i
= ro_start
+ PCI_VPD_LRDT_TAG_SIZE
;
1496 i
= pci_vpd_find_info_keyword(vpd_data
, i
, j
, wwpn_vpd_tags
[k
]);
1497 if (unlikely(i
< 0)) {
1498 dev_err(dev
, "%s: Port %d WWPN not found in VPD\n",
1504 j
= pci_vpd_info_field_size(&vpd_data
[i
]);
1505 i
+= PCI_VPD_INFO_FLD_HDR_SIZE
;
1506 if (unlikely((i
+ j
> vpd_size
) || (j
!= WWPN_LEN
))) {
1507 dev_err(dev
, "%s: Port %d WWPN incomplete or bad VPD\n",
1513 memcpy(tmp_buf
, &vpd_data
[i
], WWPN_LEN
);
1514 rc
= kstrtoul(tmp_buf
, WWPN_LEN
, (ulong
*)&wwpn
[k
]);
1516 dev_err(dev
, "%s: WWPN conversion failed for port %d\n",
1522 dev_dbg(dev
, "%s: wwpn%d=%016llx\n", __func__
, k
, wwpn
[k
]);
1526 dev_dbg(dev
, "%s: returning rc=%d\n", __func__
, rc
);
1531 * init_pcr() - initialize the provisioning and control registers
1532 * @cfg: Internal structure associated with the host.
1534 * Also sets up fast access to the mapped registers and initializes AFU
1535 * command fields that never change.
1537 static void init_pcr(struct cxlflash_cfg
*cfg
)
1539 struct afu
*afu
= cfg
->afu
;
1540 struct sisl_ctrl_map __iomem
*ctrl_map
;
1544 for (i
= 0; i
< MAX_CONTEXT
; i
++) {
1545 ctrl_map
= &afu
->afu_map
->ctrls
[i
].ctrl
;
1546 /* Disrupt any clients that could be running */
1547 /* e.g. clients that survived a master restart */
1548 writeq_be(0, &ctrl_map
->rht_start
);
1549 writeq_be(0, &ctrl_map
->rht_cnt_id
);
1550 writeq_be(0, &ctrl_map
->ctx_cap
);
1553 /* Copy frequently used fields into hwq */
1554 for (i
= 0; i
< CXLFLASH_NUM_HWQS
; i
++) {
1555 hwq
= get_hwq(afu
, i
);
1557 hwq
->ctx_hndl
= (u16
) cxl_process_element(hwq
->ctx
);
1558 hwq
->host_map
= &afu
->afu_map
->hosts
[hwq
->ctx_hndl
].host
;
1559 hwq
->ctrl_map
= &afu
->afu_map
->ctrls
[hwq
->ctx_hndl
].ctrl
;
1561 /* Program the Endian Control for the master context */
1562 writeq_be(SISL_ENDIAN_CTRL
, &hwq
->host_map
->endian_ctrl
);
1567 * init_global() - initialize AFU global registers
1568 * @cfg: Internal structure associated with the host.
1570 static int init_global(struct cxlflash_cfg
*cfg
)
1572 struct afu
*afu
= cfg
->afu
;
1573 struct device
*dev
= &cfg
->dev
->dev
;
1575 struct sisl_host_map __iomem
*hmap
;
1576 __be64 __iomem
*fc_port_regs
;
1577 u64 wwpn
[MAX_FC_PORTS
]; /* wwpn of AFU ports */
1578 int i
= 0, num_ports
= 0;
1582 rc
= read_vpd(cfg
, &wwpn
[0]);
1584 dev_err(dev
, "%s: could not read vpd rc=%d\n", __func__
, rc
);
1588 /* Set up RRQ and SQ in HWQ for master issued cmds */
1589 for (i
= 0; i
< CXLFLASH_NUM_HWQS
; i
++) {
1590 hwq
= get_hwq(afu
, i
);
1591 hmap
= hwq
->host_map
;
1593 writeq_be((u64
) hwq
->hrrq_start
, &hmap
->rrq_start
);
1594 writeq_be((u64
) hwq
->hrrq_end
, &hmap
->rrq_end
);
1596 if (afu_is_sq_cmd_mode(afu
)) {
1597 writeq_be((u64
)hwq
->hsq_start
, &hmap
->sq_start
);
1598 writeq_be((u64
)hwq
->hsq_end
, &hmap
->sq_end
);
1602 /* AFU configuration */
1603 reg
= readq_be(&afu
->afu_map
->global
.regs
.afu_config
);
1604 reg
|= SISL_AFUCONF_AR_ALL
|SISL_AFUCONF_ENDIAN
;
1605 /* enable all auto retry options and control endianness */
1606 /* leave others at default: */
1607 /* CTX_CAP write protected, mbox_r does not clear on read and */
1608 /* checker on if dual afu */
1609 writeq_be(reg
, &afu
->afu_map
->global
.regs
.afu_config
);
1611 /* Global port select: select either port */
1612 if (afu
->internal_lun
) {
1613 /* Only use port 0 */
1614 writeq_be(PORT0
, &afu
->afu_map
->global
.regs
.afu_port_sel
);
1617 writeq_be(PORT_MASK(cfg
->num_fc_ports
),
1618 &afu
->afu_map
->global
.regs
.afu_port_sel
);
1619 num_ports
= cfg
->num_fc_ports
;
1622 for (i
= 0; i
< num_ports
; i
++) {
1623 fc_port_regs
= get_fc_port_regs(cfg
, i
);
1625 /* Unmask all errors (but they are still masked at AFU) */
1626 writeq_be(0, &fc_port_regs
[FC_ERRMSK
/ 8]);
1627 /* Clear CRC error cnt & set a threshold */
1628 (void)readq_be(&fc_port_regs
[FC_CNT_CRCERR
/ 8]);
1629 writeq_be(MC_CRC_THRESH
, &fc_port_regs
[FC_CRC_THRESH
/ 8]);
1631 /* Set WWPNs. If already programmed, wwpn[i] is 0 */
1633 afu_set_wwpn(afu
, i
, &fc_port_regs
[0], wwpn
[i
]);
1634 /* Programming WWPN back to back causes additional
1635 * offline/online transitions and a PLOGI
1640 /* Set up master's own CTX_CAP to allow real mode, host translation */
1641 /* tables, afu cmds and read/write GSCSI cmds. */
1642 /* First, unlock ctx_cap write by reading mbox */
1643 for (i
= 0; i
< CXLFLASH_NUM_HWQS
; i
++) {
1644 hwq
= get_hwq(afu
, i
);
1646 (void)readq_be(&hwq
->ctrl_map
->mbox_r
); /* unlock ctx_cap */
1647 writeq_be((SISL_CTX_CAP_REAL_MODE
| SISL_CTX_CAP_HOST_XLATE
|
1648 SISL_CTX_CAP_READ_CMD
| SISL_CTX_CAP_WRITE_CMD
|
1649 SISL_CTX_CAP_AFU_CMD
| SISL_CTX_CAP_GSCSI_CMD
),
1650 &hwq
->ctrl_map
->ctx_cap
);
1652 /* Initialize heartbeat */
1653 afu
->hb
= readq_be(&afu
->afu_map
->global
.regs
.afu_hb
);
1659 * start_afu() - initializes and starts the AFU
1660 * @cfg: Internal structure associated with the host.
1662 static int start_afu(struct cxlflash_cfg
*cfg
)
1664 struct afu
*afu
= cfg
->afu
;
1665 struct device
*dev
= &cfg
->dev
->dev
;
1672 /* Initialize each HWQ */
1673 for (i
= 0; i
< CXLFLASH_NUM_HWQS
; i
++) {
1674 hwq
= get_hwq(afu
, i
);
1676 /* After an AFU reset, RRQ entries are stale, clear them */
1677 memset(&hwq
->rrq_entry
, 0, sizeof(hwq
->rrq_entry
));
1679 /* Initialize RRQ pointers */
1680 hwq
->hrrq_start
= &hwq
->rrq_entry
[0];
1681 hwq
->hrrq_end
= &hwq
->rrq_entry
[NUM_RRQ_ENTRY
- 1];
1682 hwq
->hrrq_curr
= hwq
->hrrq_start
;
1684 spin_lock_init(&hwq
->hrrq_slock
);
1687 if (afu_is_sq_cmd_mode(afu
)) {
1688 memset(&hwq
->sq
, 0, sizeof(hwq
->sq
));
1689 hwq
->hsq_start
= &hwq
->sq
[0];
1690 hwq
->hsq_end
= &hwq
->sq
[NUM_SQ_ENTRY
- 1];
1691 hwq
->hsq_curr
= hwq
->hsq_start
;
1693 spin_lock_init(&hwq
->hsq_slock
);
1694 atomic_set(&hwq
->hsq_credits
, NUM_SQ_ENTRY
- 1);
1697 /* Initialize IRQ poll */
1698 if (afu_is_irqpoll_enabled(afu
))
1699 irq_poll_init(&hwq
->irqpoll
, afu
->irqpoll_weight
,
1704 rc
= init_global(cfg
);
1706 dev_dbg(dev
, "%s: returning rc=%d\n", __func__
, rc
);
1711 * init_intr() - setup interrupt handlers for the master context
1712 * @cfg: Internal structure associated with the host.
1713 * @hwq: Hardware queue to initialize.
1715 * Return: 0 on success, -errno on failure
1717 static enum undo_level
init_intr(struct cxlflash_cfg
*cfg
,
1720 struct device
*dev
= &cfg
->dev
->dev
;
1721 struct cxl_context
*ctx
= hwq
->ctx
;
1723 enum undo_level level
= UNDO_NOOP
;
1724 bool is_primary_hwq
= (hwq
->index
== PRIMARY_HWQ
);
1725 int num_irqs
= is_primary_hwq
? 3 : 2;
1727 rc
= cxl_allocate_afu_irqs(ctx
, num_irqs
);
1729 dev_err(dev
, "%s: allocate_afu_irqs failed rc=%d\n",
1735 rc
= cxl_map_afu_irq(ctx
, 1, cxlflash_sync_err_irq
, hwq
,
1736 "SISL_MSI_SYNC_ERROR");
1737 if (unlikely(rc
<= 0)) {
1738 dev_err(dev
, "%s: SISL_MSI_SYNC_ERROR map failed\n", __func__
);
1743 rc
= cxl_map_afu_irq(ctx
, 2, cxlflash_rrq_irq
, hwq
,
1744 "SISL_MSI_RRQ_UPDATED");
1745 if (unlikely(rc
<= 0)) {
1746 dev_err(dev
, "%s: SISL_MSI_RRQ_UPDATED map failed\n", __func__
);
1751 /* SISL_MSI_ASYNC_ERROR is setup only for the primary HWQ */
1752 if (!is_primary_hwq
)
1755 rc
= cxl_map_afu_irq(ctx
, 3, cxlflash_async_err_irq
, hwq
,
1756 "SISL_MSI_ASYNC_ERROR");
1757 if (unlikely(rc
<= 0)) {
1758 dev_err(dev
, "%s: SISL_MSI_ASYNC_ERROR map failed\n", __func__
);
1767 * init_mc() - create and register as the master context
1768 * @cfg: Internal structure associated with the host.
1769 * index: HWQ Index of the master context.
1771 * Return: 0 on success, -errno on failure
1773 static int init_mc(struct cxlflash_cfg
*cfg
, u32 index
)
1775 struct cxl_context
*ctx
;
1776 struct device
*dev
= &cfg
->dev
->dev
;
1777 struct hwq
*hwq
= get_hwq(cfg
->afu
, index
);
1779 enum undo_level level
;
1781 hwq
->afu
= cfg
->afu
;
1784 if (index
== PRIMARY_HWQ
)
1785 ctx
= cxl_get_context(cfg
->dev
);
1787 ctx
= cxl_dev_context_init(cfg
->dev
);
1788 if (unlikely(!ctx
)) {
1796 /* Set it up as a master with the CXL */
1797 cxl_set_master(ctx
);
1799 /* Reset AFU when initializing primary context */
1800 if (index
== PRIMARY_HWQ
) {
1801 rc
= cxl_afu_reset(ctx
);
1803 dev_err(dev
, "%s: AFU reset failed rc=%d\n",
1809 level
= init_intr(cfg
, hwq
);
1810 if (unlikely(level
)) {
1811 dev_err(dev
, "%s: interrupt init failed rc=%d\n", __func__
, rc
);
1815 /* This performs the equivalent of the CXL_IOCTL_START_WORK.
1816 * The CXL_IOCTL_GET_PROCESS_ELEMENT is implicit in the process
1817 * element (pe) that is embedded in the context (ctx)
1819 rc
= start_context(cfg
, index
);
1821 dev_err(dev
, "%s: start context failed rc=%d\n", __func__
, rc
);
1822 level
= UNMAP_THREE
;
1827 dev_dbg(dev
, "%s: returning rc=%d\n", __func__
, rc
);
1830 term_intr(cfg
, level
, index
);
1831 if (index
!= PRIMARY_HWQ
)
1832 cxl_release_context(ctx
);
1839 * get_num_afu_ports() - determines and configures the number of AFU ports
1840 * @cfg: Internal structure associated with the host.
1842 * This routine determines the number of AFU ports by converting the global
1843 * port selection mask. The converted value is only valid following an AFU
1844 * reset (explicit or power-on). This routine must be invoked shortly after
1845 * mapping as other routines are dependent on the number of ports during the
1846 * initialization sequence.
1848 * To support legacy AFUs that might not have reflected an initial global
1849 * port mask (value read is 0), default to the number of ports originally
1850 * supported by the cxlflash driver (2) before hardware with other port
1851 * offerings was introduced.
1853 static void get_num_afu_ports(struct cxlflash_cfg
*cfg
)
1855 struct afu
*afu
= cfg
->afu
;
1856 struct device
*dev
= &cfg
->dev
->dev
;
1858 int num_fc_ports
= LEGACY_FC_PORTS
;
1860 port_mask
= readq_be(&afu
->afu_map
->global
.regs
.afu_port_sel
);
1861 if (port_mask
!= 0ULL)
1862 num_fc_ports
= min(ilog2(port_mask
) + 1, MAX_FC_PORTS
);
1864 dev_dbg(dev
, "%s: port_mask=%016llx num_fc_ports=%d\n",
1865 __func__
, port_mask
, num_fc_ports
);
1867 cfg
->num_fc_ports
= num_fc_ports
;
1868 cfg
->host
->max_channel
= PORTNUM2CHAN(num_fc_ports
);
1872 * init_afu() - setup as master context and start AFU
1873 * @cfg: Internal structure associated with the host.
1875 * This routine is a higher level of control for configuring the
1876 * AFU on probe and reset paths.
1878 * Return: 0 on success, -errno on failure
1880 static int init_afu(struct cxlflash_cfg
*cfg
)
1884 struct afu
*afu
= cfg
->afu
;
1885 struct device
*dev
= &cfg
->dev
->dev
;
1889 cxl_perst_reloads_same_image(cfg
->cxl_afu
, true);
1891 for (i
= 0; i
< CXLFLASH_NUM_HWQS
; i
++) {
1892 rc
= init_mc(cfg
, i
);
1894 dev_err(dev
, "%s: init_mc failed rc=%d index=%d\n",
1900 /* Map the entire MMIO space of the AFU using the first context */
1901 hwq
= get_hwq(afu
, PRIMARY_HWQ
);
1902 afu
->afu_map
= cxl_psa_map(hwq
->ctx
);
1903 if (!afu
->afu_map
) {
1904 dev_err(dev
, "%s: cxl_psa_map failed\n", __func__
);
1909 /* No byte reverse on reading afu_version or string will be backwards */
1910 reg
= readq(&afu
->afu_map
->global
.regs
.afu_version
);
1911 memcpy(afu
->version
, ®
, sizeof(reg
));
1912 afu
->interface_version
=
1913 readq_be(&afu
->afu_map
->global
.regs
.interface_version
);
1914 if ((afu
->interface_version
+ 1) == 0) {
1915 dev_err(dev
, "Back level AFU, please upgrade. AFU version %s "
1916 "interface version %016llx\n", afu
->version
,
1917 afu
->interface_version
);
1922 if (afu_is_sq_cmd_mode(afu
)) {
1923 afu
->send_cmd
= send_cmd_sq
;
1924 afu
->context_reset
= context_reset_sq
;
1926 afu
->send_cmd
= send_cmd_ioarrin
;
1927 afu
->context_reset
= context_reset_ioarrin
;
1930 dev_dbg(dev
, "%s: afu_ver=%s interface_ver=%016llx\n", __func__
,
1931 afu
->version
, afu
->interface_version
);
1933 get_num_afu_ports(cfg
);
1935 rc
= start_afu(cfg
);
1937 dev_err(dev
, "%s: start_afu failed, rc=%d\n", __func__
, rc
);
1941 afu_err_intr_init(cfg
->afu
);
1942 for (i
= 0; i
< CXLFLASH_NUM_HWQS
; i
++) {
1943 hwq
= get_hwq(afu
, i
);
1945 spin_lock_init(&hwq
->rrin_slock
);
1946 hwq
->room
= readq_be(&hwq
->host_map
->cmd_room
);
1949 /* Restore the LUN mappings */
1950 cxlflash_restore_luntable(cfg
);
1952 dev_dbg(dev
, "%s: returning rc=%d\n", __func__
, rc
);
1956 for (i
= CXLFLASH_NUM_HWQS
- 1; i
>= 0; i
--) {
1957 term_intr(cfg
, UNMAP_THREE
, i
);
1964 * cxlflash_afu_sync() - builds and sends an AFU sync command
1965 * @afu: AFU associated with the host.
1966 * @ctx_hndl_u: Identifies context requesting sync.
1967 * @res_hndl_u: Identifies resource requesting sync.
1968 * @mode: Type of sync to issue (lightweight, heavyweight, global).
1970 * The AFU can only take 1 sync command at a time. This routine enforces this
1971 * limitation by using a mutex to provide exclusive access to the AFU during
1972 * the sync. This design point requires calling threads to not be on interrupt
1973 * context due to the possibility of sleeping during concurrent sync operations.
1975 * AFU sync operations are only necessary and allowed when the device is
1976 * operating normally. When not operating normally, sync requests can occur as
1977 * part of cleaning up resources associated with an adapter prior to removal.
1978 * In this scenario, these requests are simply ignored (safe due to the AFU
1985 int cxlflash_afu_sync(struct afu
*afu
, ctx_hndl_t ctx_hndl_u
,
1986 res_hndl_t res_hndl_u
, u8 mode
)
1988 struct cxlflash_cfg
*cfg
= afu
->parent
;
1989 struct device
*dev
= &cfg
->dev
->dev
;
1990 struct afu_cmd
*cmd
= NULL
;
1991 struct hwq
*hwq
= get_hwq(afu
, PRIMARY_HWQ
);
1994 static DEFINE_MUTEX(sync_active
);
1996 if (cfg
->state
!= STATE_NORMAL
) {
1997 dev_dbg(dev
, "%s: Sync not required state=%u\n",
1998 __func__
, cfg
->state
);
2002 mutex_lock(&sync_active
);
2003 atomic_inc(&afu
->cmds_active
);
2004 buf
= kzalloc(sizeof(*cmd
) + __alignof__(*cmd
) - 1, GFP_KERNEL
);
2005 if (unlikely(!buf
)) {
2006 dev_err(dev
, "%s: no memory for command\n", __func__
);
2011 cmd
= (struct afu_cmd
*)PTR_ALIGN(buf
, __alignof__(*cmd
));
2012 init_completion(&cmd
->cevent
);
2014 cmd
->hwq_index
= hwq
->index
;
2016 dev_dbg(dev
, "%s: afu=%p cmd=%p %d\n", __func__
, afu
, cmd
, ctx_hndl_u
);
2018 cmd
->rcb
.req_flags
= SISL_REQ_FLAGS_AFU_CMD
;
2019 cmd
->rcb
.ctx_id
= hwq
->ctx_hndl
;
2020 cmd
->rcb
.msi
= SISL_MSI_RRQ_UPDATED
;
2021 cmd
->rcb
.timeout
= MC_AFU_SYNC_TIMEOUT
;
2023 cmd
->rcb
.cdb
[0] = 0xC0; /* AFU Sync */
2024 cmd
->rcb
.cdb
[1] = mode
;
2026 /* The cdb is aligned, no unaligned accessors required */
2027 *((__be16
*)&cmd
->rcb
.cdb
[2]) = cpu_to_be16(ctx_hndl_u
);
2028 *((__be32
*)&cmd
->rcb
.cdb
[4]) = cpu_to_be32(res_hndl_u
);
2030 rc
= afu
->send_cmd(afu
, cmd
);
2034 rc
= wait_resp(afu
, cmd
);
2038 atomic_dec(&afu
->cmds_active
);
2039 mutex_unlock(&sync_active
);
2041 dev_dbg(dev
, "%s: returning rc=%d\n", __func__
, rc
);
2046 * afu_reset() - resets the AFU
2047 * @cfg: Internal structure associated with the host.
2049 * Return: 0 on success, -errno on failure
2051 static int afu_reset(struct cxlflash_cfg
*cfg
)
2053 struct device
*dev
= &cfg
->dev
->dev
;
2056 /* Stop the context before the reset. Since the context is
2057 * no longer available restart it after the reset is complete
2063 dev_dbg(dev
, "%s: returning rc=%d\n", __func__
, rc
);
2068 * drain_ioctls() - wait until all currently executing ioctls have completed
2069 * @cfg: Internal structure associated with the host.
2071 * Obtain write access to read/write semaphore that wraps ioctl
2072 * handling to 'drain' ioctls currently executing.
2074 static void drain_ioctls(struct cxlflash_cfg
*cfg
)
2076 down_write(&cfg
->ioctl_rwsem
);
2077 up_write(&cfg
->ioctl_rwsem
);
2081 * cxlflash_eh_device_reset_handler() - reset a single LUN
2082 * @scp: SCSI command to send.
2085 * SUCCESS as defined in scsi/scsi.h
2086 * FAILED as defined in scsi/scsi.h
2088 static int cxlflash_eh_device_reset_handler(struct scsi_cmnd
*scp
)
2091 struct Scsi_Host
*host
= scp
->device
->host
;
2092 struct cxlflash_cfg
*cfg
= shost_priv(host
);
2093 struct device
*dev
= &cfg
->dev
->dev
;
2094 struct afu
*afu
= cfg
->afu
;
2097 dev_dbg(dev
, "%s: (scp=%p) %d/%d/%d/%llu "
2098 "cdb=(%08x-%08x-%08x-%08x)\n", __func__
, scp
, host
->host_no
,
2099 scp
->device
->channel
, scp
->device
->id
, scp
->device
->lun
,
2100 get_unaligned_be32(&((u32
*)scp
->cmnd
)[0]),
2101 get_unaligned_be32(&((u32
*)scp
->cmnd
)[1]),
2102 get_unaligned_be32(&((u32
*)scp
->cmnd
)[2]),
2103 get_unaligned_be32(&((u32
*)scp
->cmnd
)[3]));
2106 switch (cfg
->state
) {
2108 rcr
= send_tmf(afu
, scp
, TMF_LUN_RESET
);
2113 wait_event(cfg
->reset_waitq
, cfg
->state
!= STATE_RESET
);
2120 dev_dbg(dev
, "%s: returning rc=%d\n", __func__
, rc
);
2125 * cxlflash_eh_host_reset_handler() - reset the host adapter
2126 * @scp: SCSI command from stack identifying host.
2128 * Following a reset, the state is evaluated again in case an EEH occurred
2129 * during the reset. In such a scenario, the host reset will either yield
2130 * until the EEH recovery is complete or return success or failure based
2131 * upon the current device state.
2134 * SUCCESS as defined in scsi/scsi.h
2135 * FAILED as defined in scsi/scsi.h
2137 static int cxlflash_eh_host_reset_handler(struct scsi_cmnd
*scp
)
2141 struct Scsi_Host
*host
= scp
->device
->host
;
2142 struct cxlflash_cfg
*cfg
= shost_priv(host
);
2143 struct device
*dev
= &cfg
->dev
->dev
;
2145 dev_dbg(dev
, "%s: (scp=%p) %d/%d/%d/%llu "
2146 "cdb=(%08x-%08x-%08x-%08x)\n", __func__
, scp
, host
->host_no
,
2147 scp
->device
->channel
, scp
->device
->id
, scp
->device
->lun
,
2148 get_unaligned_be32(&((u32
*)scp
->cmnd
)[0]),
2149 get_unaligned_be32(&((u32
*)scp
->cmnd
)[1]),
2150 get_unaligned_be32(&((u32
*)scp
->cmnd
)[2]),
2151 get_unaligned_be32(&((u32
*)scp
->cmnd
)[3]));
2153 switch (cfg
->state
) {
2155 cfg
->state
= STATE_RESET
;
2157 cxlflash_mark_contexts_error(cfg
);
2158 rcr
= afu_reset(cfg
);
2161 cfg
->state
= STATE_FAILTERM
;
2163 cfg
->state
= STATE_NORMAL
;
2164 wake_up_all(&cfg
->reset_waitq
);
2168 wait_event(cfg
->reset_waitq
, cfg
->state
!= STATE_RESET
);
2169 if (cfg
->state
== STATE_NORMAL
)
2177 dev_dbg(dev
, "%s: returning rc=%d\n", __func__
, rc
);
2182 * cxlflash_change_queue_depth() - change the queue depth for the device
2183 * @sdev: SCSI device destined for queue depth change.
2184 * @qdepth: Requested queue depth value to set.
2186 * The requested queue depth is capped to the maximum supported value.
2188 * Return: The actual queue depth set.
2190 static int cxlflash_change_queue_depth(struct scsi_device
*sdev
, int qdepth
)
2193 if (qdepth
> CXLFLASH_MAX_CMDS_PER_LUN
)
2194 qdepth
= CXLFLASH_MAX_CMDS_PER_LUN
;
2196 scsi_change_queue_depth(sdev
, qdepth
);
2197 return sdev
->queue_depth
;
2201 * cxlflash_show_port_status() - queries and presents the current port status
2202 * @port: Desired port for status reporting.
2203 * @cfg: Internal structure associated with the host.
2204 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
2206 * Return: The size of the ASCII string returned in @buf or -EINVAL.
2208 static ssize_t
cxlflash_show_port_status(u32 port
,
2209 struct cxlflash_cfg
*cfg
,
2212 struct device
*dev
= &cfg
->dev
->dev
;
2215 __be64 __iomem
*fc_port_regs
;
2217 WARN_ON(port
>= MAX_FC_PORTS
);
2219 if (port
>= cfg
->num_fc_ports
) {
2220 dev_info(dev
, "%s: Port %d not supported on this card.\n",
2225 fc_port_regs
= get_fc_port_regs(cfg
, port
);
2226 status
= readq_be(&fc_port_regs
[FC_MTIP_STATUS
/ 8]);
2227 status
&= FC_MTIP_STATUS_MASK
;
2229 if (status
== FC_MTIP_STATUS_ONLINE
)
2230 disp_status
= "online";
2231 else if (status
== FC_MTIP_STATUS_OFFLINE
)
2232 disp_status
= "offline";
2234 disp_status
= "unknown";
2236 return scnprintf(buf
, PAGE_SIZE
, "%s\n", disp_status
);
2240 * port0_show() - queries and presents the current status of port 0
2241 * @dev: Generic device associated with the host owning the port.
2242 * @attr: Device attribute representing the port.
2243 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
2245 * Return: The size of the ASCII string returned in @buf.
2247 static ssize_t
port0_show(struct device
*dev
,
2248 struct device_attribute
*attr
,
2251 struct cxlflash_cfg
*cfg
= shost_priv(class_to_shost(dev
));
2253 return cxlflash_show_port_status(0, cfg
, buf
);
2257 * port1_show() - queries and presents the current status of port 1
2258 * @dev: Generic device associated with the host owning the port.
2259 * @attr: Device attribute representing the port.
2260 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
2262 * Return: The size of the ASCII string returned in @buf.
2264 static ssize_t
port1_show(struct device
*dev
,
2265 struct device_attribute
*attr
,
2268 struct cxlflash_cfg
*cfg
= shost_priv(class_to_shost(dev
));
2270 return cxlflash_show_port_status(1, cfg
, buf
);
2274 * port2_show() - queries and presents the current status of port 2
2275 * @dev: Generic device associated with the host owning the port.
2276 * @attr: Device attribute representing the port.
2277 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
2279 * Return: The size of the ASCII string returned in @buf.
2281 static ssize_t
port2_show(struct device
*dev
,
2282 struct device_attribute
*attr
,
2285 struct cxlflash_cfg
*cfg
= shost_priv(class_to_shost(dev
));
2287 return cxlflash_show_port_status(2, cfg
, buf
);
2291 * port3_show() - queries and presents the current status of port 3
2292 * @dev: Generic device associated with the host owning the port.
2293 * @attr: Device attribute representing the port.
2294 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
2296 * Return: The size of the ASCII string returned in @buf.
2298 static ssize_t
port3_show(struct device
*dev
,
2299 struct device_attribute
*attr
,
2302 struct cxlflash_cfg
*cfg
= shost_priv(class_to_shost(dev
));
2304 return cxlflash_show_port_status(3, cfg
, buf
);
2308 * lun_mode_show() - presents the current LUN mode of the host
2309 * @dev: Generic device associated with the host.
2310 * @attr: Device attribute representing the LUN mode.
2311 * @buf: Buffer of length PAGE_SIZE to report back the LUN mode in ASCII.
2313 * Return: The size of the ASCII string returned in @buf.
2315 static ssize_t
lun_mode_show(struct device
*dev
,
2316 struct device_attribute
*attr
, char *buf
)
2318 struct cxlflash_cfg
*cfg
= shost_priv(class_to_shost(dev
));
2319 struct afu
*afu
= cfg
->afu
;
2321 return scnprintf(buf
, PAGE_SIZE
, "%u\n", afu
->internal_lun
);
2325 * lun_mode_store() - sets the LUN mode of the host
2326 * @dev: Generic device associated with the host.
2327 * @attr: Device attribute representing the LUN mode.
2328 * @buf: Buffer of length PAGE_SIZE containing the LUN mode in ASCII.
2329 * @count: Length of data resizing in @buf.
2331 * The CXL Flash AFU supports a dummy LUN mode where the external
2332 * links and storage are not required. Space on the FPGA is used
2333 * to create 1 or 2 small LUNs which are presented to the system
2334 * as if they were a normal storage device. This feature is useful
2335 * during development and also provides manufacturing with a way
2336 * to test the AFU without an actual device.
2338 * 0 = external LUN[s] (default)
2339 * 1 = internal LUN (1 x 64K, 512B blocks, id 0)
2340 * 2 = internal LUN (1 x 64K, 4K blocks, id 0)
2341 * 3 = internal LUN (2 x 32K, 512B blocks, ids 0,1)
2342 * 4 = internal LUN (2 x 32K, 4K blocks, ids 0,1)
2344 * Return: The size of the ASCII string returned in @buf.
2346 static ssize_t
lun_mode_store(struct device
*dev
,
2347 struct device_attribute
*attr
,
2348 const char *buf
, size_t count
)
2350 struct Scsi_Host
*shost
= class_to_shost(dev
);
2351 struct cxlflash_cfg
*cfg
= shost_priv(shost
);
2352 struct afu
*afu
= cfg
->afu
;
2356 rc
= kstrtouint(buf
, 10, &lun_mode
);
2357 if (!rc
&& (lun_mode
< 5) && (lun_mode
!= afu
->internal_lun
)) {
2358 afu
->internal_lun
= lun_mode
;
2361 * When configured for internal LUN, there is only one channel,
2362 * channel number 0, else there will be one less than the number
2363 * of fc ports for this card.
2365 if (afu
->internal_lun
)
2366 shost
->max_channel
= 0;
2368 shost
->max_channel
= PORTNUM2CHAN(cfg
->num_fc_ports
);
2371 scsi_scan_host(cfg
->host
);
2378 * ioctl_version_show() - presents the current ioctl version of the host
2379 * @dev: Generic device associated with the host.
2380 * @attr: Device attribute representing the ioctl version.
2381 * @buf: Buffer of length PAGE_SIZE to report back the ioctl version.
2383 * Return: The size of the ASCII string returned in @buf.
2385 static ssize_t
ioctl_version_show(struct device
*dev
,
2386 struct device_attribute
*attr
, char *buf
)
2388 return scnprintf(buf
, PAGE_SIZE
, "%u\n", DK_CXLFLASH_VERSION_0
);
2392 * cxlflash_show_port_lun_table() - queries and presents the port LUN table
2393 * @port: Desired port for status reporting.
2394 * @cfg: Internal structure associated with the host.
2395 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
2397 * Return: The size of the ASCII string returned in @buf or -EINVAL.
2399 static ssize_t
cxlflash_show_port_lun_table(u32 port
,
2400 struct cxlflash_cfg
*cfg
,
2403 struct device
*dev
= &cfg
->dev
->dev
;
2404 __be64 __iomem
*fc_port_luns
;
2408 WARN_ON(port
>= MAX_FC_PORTS
);
2410 if (port
>= cfg
->num_fc_ports
) {
2411 dev_info(dev
, "%s: Port %d not supported on this card.\n",
2416 fc_port_luns
= get_fc_port_luns(cfg
, port
);
2418 for (i
= 0; i
< CXLFLASH_NUM_VLUNS
; i
++)
2419 bytes
+= scnprintf(buf
+ bytes
, PAGE_SIZE
- bytes
,
2421 i
, readq_be(&fc_port_luns
[i
]));
2426 * port0_lun_table_show() - presents the current LUN table of port 0
2427 * @dev: Generic device associated with the host owning the port.
2428 * @attr: Device attribute representing the port.
2429 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
2431 * Return: The size of the ASCII string returned in @buf.
2433 static ssize_t
port0_lun_table_show(struct device
*dev
,
2434 struct device_attribute
*attr
,
2437 struct cxlflash_cfg
*cfg
= shost_priv(class_to_shost(dev
));
2439 return cxlflash_show_port_lun_table(0, cfg
, buf
);
2443 * port1_lun_table_show() - presents the current LUN table of port 1
2444 * @dev: Generic device associated with the host owning the port.
2445 * @attr: Device attribute representing the port.
2446 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
2448 * Return: The size of the ASCII string returned in @buf.
2450 static ssize_t
port1_lun_table_show(struct device
*dev
,
2451 struct device_attribute
*attr
,
2454 struct cxlflash_cfg
*cfg
= shost_priv(class_to_shost(dev
));
2456 return cxlflash_show_port_lun_table(1, cfg
, buf
);
2460 * port2_lun_table_show() - presents the current LUN table of port 2
2461 * @dev: Generic device associated with the host owning the port.
2462 * @attr: Device attribute representing the port.
2463 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
2465 * Return: The size of the ASCII string returned in @buf.
2467 static ssize_t
port2_lun_table_show(struct device
*dev
,
2468 struct device_attribute
*attr
,
2471 struct cxlflash_cfg
*cfg
= shost_priv(class_to_shost(dev
));
2473 return cxlflash_show_port_lun_table(2, cfg
, buf
);
2477 * port3_lun_table_show() - presents the current LUN table of port 3
2478 * @dev: Generic device associated with the host owning the port.
2479 * @attr: Device attribute representing the port.
2480 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
2482 * Return: The size of the ASCII string returned in @buf.
2484 static ssize_t
port3_lun_table_show(struct device
*dev
,
2485 struct device_attribute
*attr
,
2488 struct cxlflash_cfg
*cfg
= shost_priv(class_to_shost(dev
));
2490 return cxlflash_show_port_lun_table(3, cfg
, buf
);
2494 * irqpoll_weight_show() - presents the current IRQ poll weight for the host
2495 * @dev: Generic device associated with the host.
2496 * @attr: Device attribute representing the IRQ poll weight.
2497 * @buf: Buffer of length PAGE_SIZE to report back the current IRQ poll
2500 * An IRQ poll weight of 0 indicates polling is disabled.
2502 * Return: The size of the ASCII string returned in @buf.
2504 static ssize_t
irqpoll_weight_show(struct device
*dev
,
2505 struct device_attribute
*attr
, char *buf
)
2507 struct cxlflash_cfg
*cfg
= shost_priv(class_to_shost(dev
));
2508 struct afu
*afu
= cfg
->afu
;
2510 return scnprintf(buf
, PAGE_SIZE
, "%u\n", afu
->irqpoll_weight
);
2514 * irqpoll_weight_store() - sets the current IRQ poll weight for the host
2515 * @dev: Generic device associated with the host.
2516 * @attr: Device attribute representing the IRQ poll weight.
2517 * @buf: Buffer of length PAGE_SIZE containing the desired IRQ poll
2519 * @count: Length of data resizing in @buf.
2521 * An IRQ poll weight of 0 indicates polling is disabled.
2523 * Return: The size of the ASCII string returned in @buf.
2525 static ssize_t
irqpoll_weight_store(struct device
*dev
,
2526 struct device_attribute
*attr
,
2527 const char *buf
, size_t count
)
2529 struct cxlflash_cfg
*cfg
= shost_priv(class_to_shost(dev
));
2530 struct device
*cfgdev
= &cfg
->dev
->dev
;
2531 struct afu
*afu
= cfg
->afu
;
2536 rc
= kstrtouint(buf
, 10, &weight
);
2542 "Invalid IRQ poll weight. It must be 256 or less.\n");
2546 if (weight
== afu
->irqpoll_weight
) {
2548 "Current IRQ poll weight has the same weight.\n");
2552 if (afu_is_irqpoll_enabled(afu
)) {
2553 for (i
= 0; i
< CXLFLASH_NUM_HWQS
; i
++) {
2554 hwq
= get_hwq(afu
, i
);
2556 irq_poll_disable(&hwq
->irqpoll
);
2560 afu
->irqpoll_weight
= weight
;
2563 for (i
= 0; i
< CXLFLASH_NUM_HWQS
; i
++) {
2564 hwq
= get_hwq(afu
, i
);
2566 irq_poll_init(&hwq
->irqpoll
, weight
, cxlflash_irqpoll
);
2574 * mode_show() - presents the current mode of the device
2575 * @dev: Generic device associated with the device.
2576 * @attr: Device attribute representing the device mode.
2577 * @buf: Buffer of length PAGE_SIZE to report back the dev mode in ASCII.
2579 * Return: The size of the ASCII string returned in @buf.
2581 static ssize_t
mode_show(struct device
*dev
,
2582 struct device_attribute
*attr
, char *buf
)
2584 struct scsi_device
*sdev
= to_scsi_device(dev
);
2586 return scnprintf(buf
, PAGE_SIZE
, "%s\n",
2587 sdev
->hostdata
? "superpipe" : "legacy");
2593 static DEVICE_ATTR_RO(port0
);
2594 static DEVICE_ATTR_RO(port1
);
2595 static DEVICE_ATTR_RO(port2
);
2596 static DEVICE_ATTR_RO(port3
);
2597 static DEVICE_ATTR_RW(lun_mode
);
2598 static DEVICE_ATTR_RO(ioctl_version
);
2599 static DEVICE_ATTR_RO(port0_lun_table
);
2600 static DEVICE_ATTR_RO(port1_lun_table
);
2601 static DEVICE_ATTR_RO(port2_lun_table
);
2602 static DEVICE_ATTR_RO(port3_lun_table
);
2603 static DEVICE_ATTR_RW(irqpoll_weight
);
2605 static struct device_attribute
*cxlflash_host_attrs
[] = {
2611 &dev_attr_ioctl_version
,
2612 &dev_attr_port0_lun_table
,
2613 &dev_attr_port1_lun_table
,
2614 &dev_attr_port2_lun_table
,
2615 &dev_attr_port3_lun_table
,
2616 &dev_attr_irqpoll_weight
,
2623 static DEVICE_ATTR_RO(mode
);
2625 static struct device_attribute
*cxlflash_dev_attrs
[] = {
2633 static struct scsi_host_template driver_template
= {
2634 .module
= THIS_MODULE
,
2635 .name
= CXLFLASH_ADAPTER_NAME
,
2636 .info
= cxlflash_driver_info
,
2637 .ioctl
= cxlflash_ioctl
,
2638 .proc_name
= CXLFLASH_NAME
,
2639 .queuecommand
= cxlflash_queuecommand
,
2640 .eh_device_reset_handler
= cxlflash_eh_device_reset_handler
,
2641 .eh_host_reset_handler
= cxlflash_eh_host_reset_handler
,
2642 .change_queue_depth
= cxlflash_change_queue_depth
,
2643 .cmd_per_lun
= CXLFLASH_MAX_CMDS_PER_LUN
,
2644 .can_queue
= CXLFLASH_MAX_CMDS
,
2645 .cmd_size
= sizeof(struct afu_cmd
) + __alignof__(struct afu_cmd
) - 1,
2647 .sg_tablesize
= 1, /* No scatter gather support */
2648 .max_sectors
= CXLFLASH_MAX_SECTORS
,
2649 .use_clustering
= ENABLE_CLUSTERING
,
2650 .shost_attrs
= cxlflash_host_attrs
,
2651 .sdev_attrs
= cxlflash_dev_attrs
,
2655 * Device dependent values
2657 static struct dev_dependent_vals dev_corsa_vals
= { CXLFLASH_MAX_SECTORS
,
2659 static struct dev_dependent_vals dev_flash_gt_vals
= { CXLFLASH_MAX_SECTORS
,
2660 CXLFLASH_NOTIFY_SHUTDOWN
};
2661 static struct dev_dependent_vals dev_briard_vals
= { CXLFLASH_MAX_SECTORS
,
2662 CXLFLASH_NOTIFY_SHUTDOWN
};
2665 * PCI device binding table
2667 static struct pci_device_id cxlflash_pci_table
[] = {
2668 {PCI_VENDOR_ID_IBM
, PCI_DEVICE_ID_IBM_CORSA
,
2669 PCI_ANY_ID
, PCI_ANY_ID
, 0, 0, (kernel_ulong_t
)&dev_corsa_vals
},
2670 {PCI_VENDOR_ID_IBM
, PCI_DEVICE_ID_IBM_FLASH_GT
,
2671 PCI_ANY_ID
, PCI_ANY_ID
, 0, 0, (kernel_ulong_t
)&dev_flash_gt_vals
},
2672 {PCI_VENDOR_ID_IBM
, PCI_DEVICE_ID_IBM_BRIARD
,
2673 PCI_ANY_ID
, PCI_ANY_ID
, 0, 0, (kernel_ulong_t
)&dev_briard_vals
},
2677 MODULE_DEVICE_TABLE(pci
, cxlflash_pci_table
);
2680 * cxlflash_worker_thread() - work thread handler for the AFU
2681 * @work: Work structure contained within cxlflash associated with host.
2683 * Handles the following events:
2684 * - Link reset which cannot be performed on interrupt context due to
2685 * blocking up to a few seconds
2688 static void cxlflash_worker_thread(struct work_struct
*work
)
2690 struct cxlflash_cfg
*cfg
= container_of(work
, struct cxlflash_cfg
,
2692 struct afu
*afu
= cfg
->afu
;
2693 struct device
*dev
= &cfg
->dev
->dev
;
2694 __be64 __iomem
*fc_port_regs
;
2698 /* Avoid MMIO if the device has failed */
2700 if (cfg
->state
!= STATE_NORMAL
)
2703 spin_lock_irqsave(cfg
->host
->host_lock
, lock_flags
);
2705 if (cfg
->lr_state
== LINK_RESET_REQUIRED
) {
2706 port
= cfg
->lr_port
;
2708 dev_err(dev
, "%s: invalid port index %d\n",
2711 spin_unlock_irqrestore(cfg
->host
->host_lock
,
2714 /* The reset can block... */
2715 fc_port_regs
= get_fc_port_regs(cfg
, port
);
2716 afu_link_reset(afu
, port
, fc_port_regs
);
2717 spin_lock_irqsave(cfg
->host
->host_lock
, lock_flags
);
2720 cfg
->lr_state
= LINK_RESET_COMPLETE
;
2723 spin_unlock_irqrestore(cfg
->host
->host_lock
, lock_flags
);
2725 if (atomic_dec_if_positive(&cfg
->scan_host_needed
) >= 0)
2726 scsi_scan_host(cfg
->host
);
2730 * cxlflash_probe() - PCI entry point to add host
2731 * @pdev: PCI device associated with the host.
2732 * @dev_id: PCI device id associated with device.
2734 * The device will initially start out in a 'probing' state and
2735 * transition to the 'normal' state at the end of a successful
2736 * probe. Should an EEH event occur during probe, the notification
2737 * thread (error_detected()) will wait until the probe handler
2738 * is nearly complete. At that time, the device will be moved to
2739 * a 'probed' state and the EEH thread woken up to drive the slot
2740 * reset and recovery (device moves to 'normal' state). Meanwhile,
2741 * the probe will be allowed to exit successfully.
2743 * Return: 0 on success, -errno on failure
2745 static int cxlflash_probe(struct pci_dev
*pdev
,
2746 const struct pci_device_id
*dev_id
)
2748 struct Scsi_Host
*host
;
2749 struct cxlflash_cfg
*cfg
= NULL
;
2750 struct device
*dev
= &pdev
->dev
;
2751 struct dev_dependent_vals
*ddv
;
2755 dev_dbg(&pdev
->dev
, "%s: Found CXLFLASH with IRQ: %d\n",
2756 __func__
, pdev
->irq
);
2758 ddv
= (struct dev_dependent_vals
*)dev_id
->driver_data
;
2759 driver_template
.max_sectors
= ddv
->max_sectors
;
2761 host
= scsi_host_alloc(&driver_template
, sizeof(struct cxlflash_cfg
));
2763 dev_err(dev
, "%s: scsi_host_alloc failed\n", __func__
);
2768 host
->max_id
= CXLFLASH_MAX_NUM_TARGETS_PER_BUS
;
2769 host
->max_lun
= CXLFLASH_MAX_NUM_LUNS_PER_TARGET
;
2770 host
->unique_id
= host
->host_no
;
2771 host
->max_cmd_len
= CXLFLASH_MAX_CDB_LEN
;
2773 cfg
= shost_priv(host
);
2775 rc
= alloc_mem(cfg
);
2777 dev_err(dev
, "%s: alloc_mem failed\n", __func__
);
2779 scsi_host_put(cfg
->host
);
2783 cfg
->init_state
= INIT_STATE_NONE
;
2785 cfg
->cxl_fops
= cxlflash_cxl_fops
;
2788 * Promoted LUNs move to the top of the LUN table. The rest stay on
2789 * the bottom half. The bottom half grows from the end (index = 255),
2790 * whereas the top half grows from the beginning (index = 0).
2792 * Initialize the last LUN index for all possible ports.
2794 cfg
->promote_lun_index
= 0;
2796 for (k
= 0; k
< MAX_FC_PORTS
; k
++)
2797 cfg
->last_lun_index
[k
] = CXLFLASH_NUM_VLUNS
/2 - 1;
2799 cfg
->dev_id
= (struct pci_device_id
*)dev_id
;
2801 init_waitqueue_head(&cfg
->tmf_waitq
);
2802 init_waitqueue_head(&cfg
->reset_waitq
);
2804 INIT_WORK(&cfg
->work_q
, cxlflash_worker_thread
);
2805 cfg
->lr_state
= LINK_RESET_INVALID
;
2807 spin_lock_init(&cfg
->tmf_slock
);
2808 mutex_init(&cfg
->ctx_tbl_list_mutex
);
2809 mutex_init(&cfg
->ctx_recovery_mutex
);
2810 init_rwsem(&cfg
->ioctl_rwsem
);
2811 INIT_LIST_HEAD(&cfg
->ctx_err_recovery
);
2812 INIT_LIST_HEAD(&cfg
->lluns
);
2814 pci_set_drvdata(pdev
, cfg
);
2816 cfg
->cxl_afu
= cxl_pci_to_afu(pdev
);
2820 dev_err(dev
, "%s: init_pci failed rc=%d\n", __func__
, rc
);
2823 cfg
->init_state
= INIT_STATE_PCI
;
2826 if (rc
&& !wq_has_sleeper(&cfg
->reset_waitq
)) {
2827 dev_err(dev
, "%s: init_afu failed rc=%d\n", __func__
, rc
);
2830 cfg
->init_state
= INIT_STATE_AFU
;
2832 rc
= init_scsi(cfg
);
2834 dev_err(dev
, "%s: init_scsi failed rc=%d\n", __func__
, rc
);
2837 cfg
->init_state
= INIT_STATE_SCSI
;
2839 if (wq_has_sleeper(&cfg
->reset_waitq
)) {
2840 cfg
->state
= STATE_PROBED
;
2841 wake_up_all(&cfg
->reset_waitq
);
2843 cfg
->state
= STATE_NORMAL
;
2845 dev_dbg(dev
, "%s: returning rc=%d\n", __func__
, rc
);
2849 cxlflash_remove(pdev
);
2854 * cxlflash_pci_error_detected() - called when a PCI error is detected
2855 * @pdev: PCI device struct.
2856 * @state: PCI channel state.
2858 * When an EEH occurs during an active reset, wait until the reset is
2859 * complete and then take action based upon the device state.
2861 * Return: PCI_ERS_RESULT_NEED_RESET or PCI_ERS_RESULT_DISCONNECT
2863 static pci_ers_result_t
cxlflash_pci_error_detected(struct pci_dev
*pdev
,
2864 pci_channel_state_t state
)
2867 struct cxlflash_cfg
*cfg
= pci_get_drvdata(pdev
);
2868 struct device
*dev
= &cfg
->dev
->dev
;
2870 dev_dbg(dev
, "%s: pdev=%p state=%u\n", __func__
, pdev
, state
);
2873 case pci_channel_io_frozen
:
2874 wait_event(cfg
->reset_waitq
, cfg
->state
!= STATE_RESET
&&
2875 cfg
->state
!= STATE_PROBING
);
2876 if (cfg
->state
== STATE_FAILTERM
)
2877 return PCI_ERS_RESULT_DISCONNECT
;
2879 cfg
->state
= STATE_RESET
;
2880 scsi_block_requests(cfg
->host
);
2882 rc
= cxlflash_mark_contexts_error(cfg
);
2884 dev_err(dev
, "%s: Failed to mark user contexts rc=%d\n",
2887 return PCI_ERS_RESULT_NEED_RESET
;
2888 case pci_channel_io_perm_failure
:
2889 cfg
->state
= STATE_FAILTERM
;
2890 wake_up_all(&cfg
->reset_waitq
);
2891 scsi_unblock_requests(cfg
->host
);
2892 return PCI_ERS_RESULT_DISCONNECT
;
2896 return PCI_ERS_RESULT_NEED_RESET
;
2900 * cxlflash_pci_slot_reset() - called when PCI slot has been reset
2901 * @pdev: PCI device struct.
2903 * This routine is called by the pci error recovery code after the PCI
2904 * slot has been reset, just before we should resume normal operations.
2906 * Return: PCI_ERS_RESULT_RECOVERED or PCI_ERS_RESULT_DISCONNECT
2908 static pci_ers_result_t
cxlflash_pci_slot_reset(struct pci_dev
*pdev
)
2911 struct cxlflash_cfg
*cfg
= pci_get_drvdata(pdev
);
2912 struct device
*dev
= &cfg
->dev
->dev
;
2914 dev_dbg(dev
, "%s: pdev=%p\n", __func__
, pdev
);
2918 dev_err(dev
, "%s: EEH recovery failed rc=%d\n", __func__
, rc
);
2919 return PCI_ERS_RESULT_DISCONNECT
;
2922 return PCI_ERS_RESULT_RECOVERED
;
2926 * cxlflash_pci_resume() - called when normal operation can resume
2927 * @pdev: PCI device struct
2929 static void cxlflash_pci_resume(struct pci_dev
*pdev
)
2931 struct cxlflash_cfg
*cfg
= pci_get_drvdata(pdev
);
2932 struct device
*dev
= &cfg
->dev
->dev
;
2934 dev_dbg(dev
, "%s: pdev=%p\n", __func__
, pdev
);
2936 cfg
->state
= STATE_NORMAL
;
2937 wake_up_all(&cfg
->reset_waitq
);
2938 scsi_unblock_requests(cfg
->host
);
2941 static const struct pci_error_handlers cxlflash_err_handler
= {
2942 .error_detected
= cxlflash_pci_error_detected
,
2943 .slot_reset
= cxlflash_pci_slot_reset
,
2944 .resume
= cxlflash_pci_resume
,
2948 * PCI device structure
2950 static struct pci_driver cxlflash_driver
= {
2951 .name
= CXLFLASH_NAME
,
2952 .id_table
= cxlflash_pci_table
,
2953 .probe
= cxlflash_probe
,
2954 .remove
= cxlflash_remove
,
2955 .shutdown
= cxlflash_remove
,
2956 .err_handler
= &cxlflash_err_handler
,
2960 * init_cxlflash() - module entry point
2962 * Return: 0 on success, -errno on failure
2964 static int __init
init_cxlflash(void)
2967 cxlflash_list_init();
2969 return pci_register_driver(&cxlflash_driver
);
2973 * exit_cxlflash() - module exit point
2975 static void __exit
exit_cxlflash(void)
2977 cxlflash_term_global_luns();
2978 cxlflash_free_errpage();
2980 pci_unregister_driver(&cxlflash_driver
);
2983 module_init(init_cxlflash
);
2984 module_exit(exit_cxlflash
);