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
->hsq_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
->hsq_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 * cmd_to_target_hwq() - selects a target hardware queue for a SCSI command
362 * @host: SCSI host associated with device.
363 * @scp: SCSI command to send.
364 * @afu: SCSI command to send.
366 * Hashes a command based upon the hardware queue mode.
368 * Return: Trusted index of target hardware queue
370 static u32
cmd_to_target_hwq(struct Scsi_Host
*host
, struct scsi_cmnd
*scp
,
376 if (afu
->num_hwqs
== 1)
379 switch (afu
->hwq_mode
) {
381 hwq
= afu
->hwq_rr_count
++ % afu
->num_hwqs
;
384 tag
= blk_mq_unique_tag(scp
->request
);
385 hwq
= blk_mq_unique_tag_to_hwq(tag
);
388 hwq
= smp_processor_id() % afu
->num_hwqs
;
398 * send_tmf() - sends a Task Management Function (TMF)
399 * @afu: AFU to checkout from.
400 * @scp: SCSI command from stack.
401 * @tmfcmd: TMF command to send.
404 * 0 on success, SCSI_MLQUEUE_HOST_BUSY on failure
406 static int send_tmf(struct afu
*afu
, struct scsi_cmnd
*scp
, u64 tmfcmd
)
408 struct Scsi_Host
*host
= scp
->device
->host
;
409 struct cxlflash_cfg
*cfg
= shost_priv(host
);
410 struct afu_cmd
*cmd
= sc_to_afucz(scp
);
411 struct device
*dev
= &cfg
->dev
->dev
;
412 int hwq_index
= cmd_to_target_hwq(host
, scp
, afu
);
413 struct hwq
*hwq
= get_hwq(afu
, hwq_index
);
418 /* When Task Management Function is active do not send another */
419 spin_lock_irqsave(&cfg
->tmf_slock
, lock_flags
);
421 wait_event_interruptible_lock_irq(cfg
->tmf_waitq
,
424 cfg
->tmf_active
= true;
425 spin_unlock_irqrestore(&cfg
->tmf_slock
, lock_flags
);
430 cmd
->hwq_index
= hwq_index
;
432 cmd
->rcb
.ctx_id
= hwq
->ctx_hndl
;
433 cmd
->rcb
.msi
= SISL_MSI_RRQ_UPDATED
;
434 cmd
->rcb
.port_sel
= CHAN2PORTMASK(scp
->device
->channel
);
435 cmd
->rcb
.lun_id
= lun_to_lunid(scp
->device
->lun
);
436 cmd
->rcb
.req_flags
= (SISL_REQ_FLAGS_PORT_LUN_ID
|
437 SISL_REQ_FLAGS_SUP_UNDERRUN
|
438 SISL_REQ_FLAGS_TMF_CMD
);
439 memcpy(cmd
->rcb
.cdb
, &tmfcmd
, sizeof(tmfcmd
));
441 rc
= afu
->send_cmd(afu
, cmd
);
443 spin_lock_irqsave(&cfg
->tmf_slock
, lock_flags
);
444 cfg
->tmf_active
= false;
445 spin_unlock_irqrestore(&cfg
->tmf_slock
, lock_flags
);
449 spin_lock_irqsave(&cfg
->tmf_slock
, lock_flags
);
450 to
= msecs_to_jiffies(5000);
451 to
= wait_event_interruptible_lock_irq_timeout(cfg
->tmf_waitq
,
456 cfg
->tmf_active
= false;
457 dev_err(dev
, "%s: TMF timed out\n", __func__
);
460 spin_unlock_irqrestore(&cfg
->tmf_slock
, lock_flags
);
466 * cxlflash_driver_info() - information handler for this host driver
467 * @host: SCSI host associated with device.
469 * Return: A string describing the device.
471 static const char *cxlflash_driver_info(struct Scsi_Host
*host
)
473 return CXLFLASH_ADAPTER_NAME
;
477 * cxlflash_queuecommand() - sends a mid-layer request
478 * @host: SCSI host associated with device.
479 * @scp: SCSI command to send.
481 * Return: 0 on success, SCSI_MLQUEUE_HOST_BUSY on failure
483 static int cxlflash_queuecommand(struct Scsi_Host
*host
, struct scsi_cmnd
*scp
)
485 struct cxlflash_cfg
*cfg
= shost_priv(host
);
486 struct afu
*afu
= cfg
->afu
;
487 struct device
*dev
= &cfg
->dev
->dev
;
488 struct afu_cmd
*cmd
= sc_to_afucz(scp
);
489 struct scatterlist
*sg
= scsi_sglist(scp
);
490 int hwq_index
= cmd_to_target_hwq(host
, scp
, afu
);
491 struct hwq
*hwq
= get_hwq(afu
, hwq_index
);
492 u16 req_flags
= SISL_REQ_FLAGS_SUP_UNDERRUN
;
496 dev_dbg_ratelimited(dev
, "%s: (scp=%p) %d/%d/%d/%llu "
497 "cdb=(%08x-%08x-%08x-%08x)\n",
498 __func__
, scp
, host
->host_no
, scp
->device
->channel
,
499 scp
->device
->id
, scp
->device
->lun
,
500 get_unaligned_be32(&((u32
*)scp
->cmnd
)[0]),
501 get_unaligned_be32(&((u32
*)scp
->cmnd
)[1]),
502 get_unaligned_be32(&((u32
*)scp
->cmnd
)[2]),
503 get_unaligned_be32(&((u32
*)scp
->cmnd
)[3]));
506 * If a Task Management Function is active, wait for it to complete
507 * before continuing with regular commands.
509 spin_lock_irqsave(&cfg
->tmf_slock
, lock_flags
);
510 if (cfg
->tmf_active
) {
511 spin_unlock_irqrestore(&cfg
->tmf_slock
, lock_flags
);
512 rc
= SCSI_MLQUEUE_HOST_BUSY
;
515 spin_unlock_irqrestore(&cfg
->tmf_slock
, lock_flags
);
517 switch (cfg
->state
) {
521 dev_dbg_ratelimited(dev
, "%s: device is in reset\n", __func__
);
522 rc
= SCSI_MLQUEUE_HOST_BUSY
;
525 dev_dbg_ratelimited(dev
, "%s: device has failed\n", __func__
);
526 scp
->result
= (DID_NO_CONNECT
<< 16);
535 cmd
->rcb
.data_len
= sg
->length
;
536 cmd
->rcb
.data_ea
= (uintptr_t)sg_virt(sg
);
541 cmd
->hwq_index
= hwq_index
;
543 cmd
->rcb
.ctx_id
= hwq
->ctx_hndl
;
544 cmd
->rcb
.msi
= SISL_MSI_RRQ_UPDATED
;
545 cmd
->rcb
.port_sel
= CHAN2PORTMASK(scp
->device
->channel
);
546 cmd
->rcb
.lun_id
= lun_to_lunid(scp
->device
->lun
);
548 if (scp
->sc_data_direction
== DMA_TO_DEVICE
)
549 req_flags
|= SISL_REQ_FLAGS_HOST_WRITE
;
551 cmd
->rcb
.req_flags
= req_flags
;
552 memcpy(cmd
->rcb
.cdb
, scp
->cmnd
, sizeof(cmd
->rcb
.cdb
));
554 rc
= afu
->send_cmd(afu
, cmd
);
560 * cxlflash_wait_for_pci_err_recovery() - wait for error recovery during probe
561 * @cfg: Internal structure associated with the host.
563 static void cxlflash_wait_for_pci_err_recovery(struct cxlflash_cfg
*cfg
)
565 struct pci_dev
*pdev
= cfg
->dev
;
567 if (pci_channel_offline(pdev
))
568 wait_event_timeout(cfg
->reset_waitq
,
569 !pci_channel_offline(pdev
),
570 CXLFLASH_PCI_ERROR_RECOVERY_TIMEOUT
);
574 * free_mem() - free memory associated with the AFU
575 * @cfg: Internal structure associated with the host.
577 static void free_mem(struct cxlflash_cfg
*cfg
)
579 struct afu
*afu
= cfg
->afu
;
582 free_pages((ulong
)afu
, get_order(sizeof(struct afu
)));
588 * stop_afu() - stops the AFU command timers and unmaps the MMIO space
589 * @cfg: Internal structure associated with the host.
591 * Safe to call with AFU in a partially allocated/initialized state.
593 * Cancels scheduled worker threads, waits for any active internal AFU
594 * commands to timeout, disables IRQ polling and then unmaps the MMIO space.
596 static void stop_afu(struct cxlflash_cfg
*cfg
)
598 struct afu
*afu
= cfg
->afu
;
602 cancel_work_sync(&cfg
->work_q
);
605 while (atomic_read(&afu
->cmds_active
))
608 if (afu_is_irqpoll_enabled(afu
)) {
609 for (i
= 0; i
< afu
->num_hwqs
; i
++) {
610 hwq
= get_hwq(afu
, i
);
612 irq_poll_disable(&hwq
->irqpoll
);
616 if (likely(afu
->afu_map
)) {
617 cxl_psa_unmap((void __iomem
*)afu
->afu_map
);
624 * term_intr() - disables all AFU interrupts
625 * @cfg: Internal structure associated with the host.
626 * @level: Depth of allocation, where to begin waterfall tear down.
627 * @index: Index of the hardware queue.
629 * Safe to call with AFU/MC in partially allocated/initialized state.
631 static void term_intr(struct cxlflash_cfg
*cfg
, enum undo_level level
,
634 struct afu
*afu
= cfg
->afu
;
635 struct device
*dev
= &cfg
->dev
->dev
;
639 dev_err(dev
, "%s: returning with NULL afu\n", __func__
);
643 hwq
= get_hwq(afu
, index
);
646 dev_err(dev
, "%s: returning with NULL MC\n", __func__
);
652 /* SISL_MSI_ASYNC_ERROR is setup only for the primary HWQ */
653 if (index
== PRIMARY_HWQ
)
654 cxl_unmap_afu_irq(hwq
->ctx
, 3, hwq
);
656 cxl_unmap_afu_irq(hwq
->ctx
, 2, hwq
);
658 cxl_unmap_afu_irq(hwq
->ctx
, 1, hwq
);
660 cxl_free_afu_irqs(hwq
->ctx
);
663 /* No action required */
669 * term_mc() - terminates the master context
670 * @cfg: Internal structure associated with the host.
671 * @index: Index of the hardware queue.
673 * Safe to call with AFU/MC in partially allocated/initialized state.
675 static void term_mc(struct cxlflash_cfg
*cfg
, u32 index
)
677 struct afu
*afu
= cfg
->afu
;
678 struct device
*dev
= &cfg
->dev
->dev
;
682 dev_err(dev
, "%s: returning with NULL afu\n", __func__
);
686 hwq
= get_hwq(afu
, index
);
689 dev_err(dev
, "%s: returning with NULL MC\n", __func__
);
693 WARN_ON(cxl_stop_context(hwq
->ctx
));
694 if (index
!= PRIMARY_HWQ
)
695 WARN_ON(cxl_release_context(hwq
->ctx
));
700 * term_afu() - terminates the AFU
701 * @cfg: Internal structure associated with the host.
703 * Safe to call with AFU/MC in partially allocated/initialized state.
705 static void term_afu(struct cxlflash_cfg
*cfg
)
707 struct device
*dev
= &cfg
->dev
->dev
;
711 * Tear down is carefully orchestrated to ensure
712 * no interrupts can come in when the problem state
715 * 1) Disable all AFU interrupts for each master
716 * 2) Unmap the problem state area
717 * 3) Stop each master context
719 for (k
= cfg
->afu
->num_hwqs
- 1; k
>= 0; k
--)
720 term_intr(cfg
, UNMAP_THREE
, k
);
725 for (k
= cfg
->afu
->num_hwqs
- 1; k
>= 0; k
--)
728 dev_dbg(dev
, "%s: returning\n", __func__
);
732 * notify_shutdown() - notifies device of pending shutdown
733 * @cfg: Internal structure associated with the host.
734 * @wait: Whether to wait for shutdown processing to complete.
736 * This function will notify the AFU that the adapter is being shutdown
737 * and will wait for shutdown processing to complete if wait is true.
738 * This notification should flush pending I/Os to the device and halt
739 * further I/Os until the next AFU reset is issued and device restarted.
741 static void notify_shutdown(struct cxlflash_cfg
*cfg
, bool wait
)
743 struct afu
*afu
= cfg
->afu
;
744 struct device
*dev
= &cfg
->dev
->dev
;
745 struct dev_dependent_vals
*ddv
;
746 __be64 __iomem
*fc_port_regs
;
748 int i
, retry_cnt
= 0;
750 ddv
= (struct dev_dependent_vals
*)cfg
->dev_id
->driver_data
;
751 if (!(ddv
->flags
& CXLFLASH_NOTIFY_SHUTDOWN
))
754 if (!afu
|| !afu
->afu_map
) {
755 dev_dbg(dev
, "%s: Problem state area not mapped\n", __func__
);
760 for (i
= 0; i
< cfg
->num_fc_ports
; i
++) {
761 fc_port_regs
= get_fc_port_regs(cfg
, i
);
763 reg
= readq_be(&fc_port_regs
[FC_CONFIG2
/ 8]);
764 reg
|= SISL_FC_SHUTDOWN_NORMAL
;
765 writeq_be(reg
, &fc_port_regs
[FC_CONFIG2
/ 8]);
771 /* Wait up to 1.5 seconds for shutdown processing to complete */
772 for (i
= 0; i
< cfg
->num_fc_ports
; i
++) {
773 fc_port_regs
= get_fc_port_regs(cfg
, i
);
777 status
= readq_be(&fc_port_regs
[FC_STATUS
/ 8]);
778 if (status
& SISL_STATUS_SHUTDOWN_COMPLETE
)
780 if (++retry_cnt
>= MC_RETRY_CNT
) {
781 dev_dbg(dev
, "%s: port %d shutdown processing "
782 "not yet completed\n", __func__
, i
);
785 msleep(100 * retry_cnt
);
791 * cxlflash_remove() - PCI entry point to tear down host
792 * @pdev: PCI device associated with the host.
794 * Safe to use as a cleanup in partially allocated/initialized state. Note that
795 * the reset_waitq is flushed as part of the stop/termination of user contexts.
797 static void cxlflash_remove(struct pci_dev
*pdev
)
799 struct cxlflash_cfg
*cfg
= pci_get_drvdata(pdev
);
800 struct device
*dev
= &pdev
->dev
;
803 if (!pci_is_enabled(pdev
)) {
804 dev_dbg(dev
, "%s: Device is disabled\n", __func__
);
808 /* If a Task Management Function is active, wait for it to complete
809 * before continuing with remove.
811 spin_lock_irqsave(&cfg
->tmf_slock
, lock_flags
);
813 wait_event_interruptible_lock_irq(cfg
->tmf_waitq
,
816 spin_unlock_irqrestore(&cfg
->tmf_slock
, lock_flags
);
818 /* Notify AFU and wait for shutdown processing to complete */
819 notify_shutdown(cfg
, true);
821 cfg
->state
= STATE_FAILTERM
;
822 cxlflash_stop_term_user_contexts(cfg
);
824 switch (cfg
->init_state
) {
825 case INIT_STATE_SCSI
:
826 cxlflash_term_local_luns(cfg
);
827 scsi_remove_host(cfg
->host
);
831 pci_disable_device(pdev
);
832 case INIT_STATE_NONE
:
834 scsi_host_put(cfg
->host
);
838 dev_dbg(dev
, "%s: returning\n", __func__
);
842 * alloc_mem() - allocates the AFU and its command pool
843 * @cfg: Internal structure associated with the host.
845 * A partially allocated state remains on failure.
849 * -ENOMEM on failure to allocate memory
851 static int alloc_mem(struct cxlflash_cfg
*cfg
)
854 struct device
*dev
= &cfg
->dev
->dev
;
856 /* AFU is ~28k, i.e. only one 64k page or up to seven 4k pages */
857 cfg
->afu
= (void *)__get_free_pages(GFP_KERNEL
| __GFP_ZERO
,
858 get_order(sizeof(struct afu
)));
859 if (unlikely(!cfg
->afu
)) {
860 dev_err(dev
, "%s: cannot get %d free pages\n",
861 __func__
, get_order(sizeof(struct afu
)));
865 cfg
->afu
->parent
= cfg
;
866 cfg
->afu
->desired_hwqs
= CXLFLASH_DEF_HWQS
;
867 cfg
->afu
->afu_map
= NULL
;
873 * init_pci() - initializes the host as a PCI device
874 * @cfg: Internal structure associated with the host.
876 * Return: 0 on success, -errno on failure
878 static int init_pci(struct cxlflash_cfg
*cfg
)
880 struct pci_dev
*pdev
= cfg
->dev
;
881 struct device
*dev
= &cfg
->dev
->dev
;
884 rc
= pci_enable_device(pdev
);
885 if (rc
|| pci_channel_offline(pdev
)) {
886 if (pci_channel_offline(pdev
)) {
887 cxlflash_wait_for_pci_err_recovery(cfg
);
888 rc
= pci_enable_device(pdev
);
892 dev_err(dev
, "%s: Cannot enable adapter\n", __func__
);
893 cxlflash_wait_for_pci_err_recovery(cfg
);
899 dev_dbg(dev
, "%s: returning rc=%d\n", __func__
, rc
);
904 * init_scsi() - adds the host to the SCSI stack and kicks off host scan
905 * @cfg: Internal structure associated with the host.
907 * Return: 0 on success, -errno on failure
909 static int init_scsi(struct cxlflash_cfg
*cfg
)
911 struct pci_dev
*pdev
= cfg
->dev
;
912 struct device
*dev
= &cfg
->dev
->dev
;
915 rc
= scsi_add_host(cfg
->host
, &pdev
->dev
);
917 dev_err(dev
, "%s: scsi_add_host failed rc=%d\n", __func__
, rc
);
921 scsi_scan_host(cfg
->host
);
924 dev_dbg(dev
, "%s: returning rc=%d\n", __func__
, rc
);
929 * set_port_online() - transitions the specified host FC port to online state
930 * @fc_regs: Top of MMIO region defined for specified port.
932 * The provided MMIO region must be mapped prior to call. Online state means
933 * that the FC link layer has synced, completed the handshaking process, and
934 * is ready for login to start.
936 static void set_port_online(__be64 __iomem
*fc_regs
)
940 cmdcfg
= readq_be(&fc_regs
[FC_MTIP_CMDCONFIG
/ 8]);
941 cmdcfg
&= (~FC_MTIP_CMDCONFIG_OFFLINE
); /* clear OFF_LINE */
942 cmdcfg
|= (FC_MTIP_CMDCONFIG_ONLINE
); /* set ON_LINE */
943 writeq_be(cmdcfg
, &fc_regs
[FC_MTIP_CMDCONFIG
/ 8]);
947 * set_port_offline() - transitions the specified host FC port to offline state
948 * @fc_regs: Top of MMIO region defined for specified port.
950 * The provided MMIO region must be mapped prior to call.
952 static void set_port_offline(__be64 __iomem
*fc_regs
)
956 cmdcfg
= readq_be(&fc_regs
[FC_MTIP_CMDCONFIG
/ 8]);
957 cmdcfg
&= (~FC_MTIP_CMDCONFIG_ONLINE
); /* clear ON_LINE */
958 cmdcfg
|= (FC_MTIP_CMDCONFIG_OFFLINE
); /* set OFF_LINE */
959 writeq_be(cmdcfg
, &fc_regs
[FC_MTIP_CMDCONFIG
/ 8]);
963 * wait_port_online() - waits for the specified host FC port come online
964 * @fc_regs: Top of MMIO region defined for specified port.
965 * @delay_us: Number of microseconds to delay between reading port status.
966 * @nretry: Number of cycles to retry reading port status.
968 * The provided MMIO region must be mapped prior to call. This will timeout
969 * when the cable is not plugged in.
972 * TRUE (1) when the specified port is online
973 * FALSE (0) when the specified port fails to come online after timeout
975 static bool wait_port_online(__be64 __iomem
*fc_regs
, u32 delay_us
, u32 nretry
)
979 WARN_ON(delay_us
< 1000);
982 msleep(delay_us
/ 1000);
983 status
= readq_be(&fc_regs
[FC_MTIP_STATUS
/ 8]);
984 if (status
== U64_MAX
)
986 } while ((status
& FC_MTIP_STATUS_MASK
) != FC_MTIP_STATUS_ONLINE
&&
989 return ((status
& FC_MTIP_STATUS_MASK
) == FC_MTIP_STATUS_ONLINE
);
993 * wait_port_offline() - waits for the specified host FC port go offline
994 * @fc_regs: Top of MMIO region defined for specified port.
995 * @delay_us: Number of microseconds to delay between reading port status.
996 * @nretry: Number of cycles to retry reading port status.
998 * The provided MMIO region must be mapped prior to call.
1001 * TRUE (1) when the specified port is offline
1002 * FALSE (0) when the specified port fails to go offline after timeout
1004 static bool wait_port_offline(__be64 __iomem
*fc_regs
, u32 delay_us
, u32 nretry
)
1008 WARN_ON(delay_us
< 1000);
1011 msleep(delay_us
/ 1000);
1012 status
= readq_be(&fc_regs
[FC_MTIP_STATUS
/ 8]);
1013 if (status
== U64_MAX
)
1015 } while ((status
& FC_MTIP_STATUS_MASK
) != FC_MTIP_STATUS_OFFLINE
&&
1018 return ((status
& FC_MTIP_STATUS_MASK
) == FC_MTIP_STATUS_OFFLINE
);
1022 * afu_set_wwpn() - configures the WWPN for the specified host FC port
1023 * @afu: AFU associated with the host that owns the specified FC port.
1024 * @port: Port number being configured.
1025 * @fc_regs: Top of MMIO region defined for specified port.
1026 * @wwpn: The world-wide-port-number previously discovered for port.
1028 * The provided MMIO region must be mapped prior to call. As part of the
1029 * sequence to configure the WWPN, the port is toggled offline and then back
1030 * online. This toggling action can cause this routine to delay up to a few
1031 * seconds. When configured to use the internal LUN feature of the AFU, a
1032 * failure to come online is overridden.
1034 static void afu_set_wwpn(struct afu
*afu
, int port
, __be64 __iomem
*fc_regs
,
1037 struct cxlflash_cfg
*cfg
= afu
->parent
;
1038 struct device
*dev
= &cfg
->dev
->dev
;
1040 set_port_offline(fc_regs
);
1041 if (!wait_port_offline(fc_regs
, FC_PORT_STATUS_RETRY_INTERVAL_US
,
1042 FC_PORT_STATUS_RETRY_CNT
)) {
1043 dev_dbg(dev
, "%s: wait on port %d to go offline timed out\n",
1047 writeq_be(wwpn
, &fc_regs
[FC_PNAME
/ 8]);
1049 set_port_online(fc_regs
);
1050 if (!wait_port_online(fc_regs
, FC_PORT_STATUS_RETRY_INTERVAL_US
,
1051 FC_PORT_STATUS_RETRY_CNT
)) {
1052 dev_dbg(dev
, "%s: wait on port %d to go online timed out\n",
1058 * afu_link_reset() - resets the specified host FC port
1059 * @afu: AFU associated with the host that owns the specified FC port.
1060 * @port: Port number being configured.
1061 * @fc_regs: Top of MMIO region defined for specified port.
1063 * The provided MMIO region must be mapped prior to call. The sequence to
1064 * reset the port involves toggling it offline and then back online. This
1065 * action can cause this routine to delay up to a few seconds. An effort
1066 * is made to maintain link with the device by switching to host to use
1067 * the alternate port exclusively while the reset takes place.
1068 * failure to come online is overridden.
1070 static void afu_link_reset(struct afu
*afu
, int port
, __be64 __iomem
*fc_regs
)
1072 struct cxlflash_cfg
*cfg
= afu
->parent
;
1073 struct device
*dev
= &cfg
->dev
->dev
;
1076 /* first switch the AFU to the other links, if any */
1077 port_sel
= readq_be(&afu
->afu_map
->global
.regs
.afu_port_sel
);
1078 port_sel
&= ~(1ULL << port
);
1079 writeq_be(port_sel
, &afu
->afu_map
->global
.regs
.afu_port_sel
);
1080 cxlflash_afu_sync(afu
, 0, 0, AFU_GSYNC
);
1082 set_port_offline(fc_regs
);
1083 if (!wait_port_offline(fc_regs
, FC_PORT_STATUS_RETRY_INTERVAL_US
,
1084 FC_PORT_STATUS_RETRY_CNT
))
1085 dev_err(dev
, "%s: wait on port %d to go offline timed out\n",
1088 set_port_online(fc_regs
);
1089 if (!wait_port_online(fc_regs
, FC_PORT_STATUS_RETRY_INTERVAL_US
,
1090 FC_PORT_STATUS_RETRY_CNT
))
1091 dev_err(dev
, "%s: wait on port %d to go online timed out\n",
1094 /* switch back to include this port */
1095 port_sel
|= (1ULL << port
);
1096 writeq_be(port_sel
, &afu
->afu_map
->global
.regs
.afu_port_sel
);
1097 cxlflash_afu_sync(afu
, 0, 0, AFU_GSYNC
);
1099 dev_dbg(dev
, "%s: returning port_sel=%016llx\n", __func__
, port_sel
);
1103 * afu_err_intr_init() - clears and initializes the AFU for error interrupts
1104 * @afu: AFU associated with the host.
1106 static void afu_err_intr_init(struct afu
*afu
)
1108 struct cxlflash_cfg
*cfg
= afu
->parent
;
1109 __be64 __iomem
*fc_port_regs
;
1111 struct hwq
*hwq
= get_hwq(afu
, PRIMARY_HWQ
);
1114 /* global async interrupts: AFU clears afu_ctrl on context exit
1115 * if async interrupts were sent to that context. This prevents
1116 * the AFU form sending further async interrupts when
1118 * nobody to receive them.
1122 writeq_be(-1ULL, &afu
->afu_map
->global
.regs
.aintr_mask
);
1123 /* set LISN# to send and point to primary master context */
1124 reg
= ((u64
) (((hwq
->ctx_hndl
<< 8) | SISL_MSI_ASYNC_ERROR
)) << 40);
1126 if (afu
->internal_lun
)
1127 reg
|= 1; /* Bit 63 indicates local lun */
1128 writeq_be(reg
, &afu
->afu_map
->global
.regs
.afu_ctrl
);
1130 writeq_be(-1ULL, &afu
->afu_map
->global
.regs
.aintr_clear
);
1131 /* unmask bits that are of interest */
1132 /* note: afu can send an interrupt after this step */
1133 writeq_be(SISL_ASTATUS_MASK
, &afu
->afu_map
->global
.regs
.aintr_mask
);
1134 /* clear again in case a bit came on after previous clear but before */
1136 writeq_be(-1ULL, &afu
->afu_map
->global
.regs
.aintr_clear
);
1138 /* Clear/Set internal lun bits */
1139 fc_port_regs
= get_fc_port_regs(cfg
, 0);
1140 reg
= readq_be(&fc_port_regs
[FC_CONFIG2
/ 8]);
1141 reg
&= SISL_FC_INTERNAL_MASK
;
1142 if (afu
->internal_lun
)
1143 reg
|= ((u64
)(afu
->internal_lun
- 1) << SISL_FC_INTERNAL_SHIFT
);
1144 writeq_be(reg
, &fc_port_regs
[FC_CONFIG2
/ 8]);
1146 /* now clear FC errors */
1147 for (i
= 0; i
< cfg
->num_fc_ports
; i
++) {
1148 fc_port_regs
= get_fc_port_regs(cfg
, i
);
1150 writeq_be(0xFFFFFFFFU
, &fc_port_regs
[FC_ERROR
/ 8]);
1151 writeq_be(0, &fc_port_regs
[FC_ERRCAP
/ 8]);
1154 /* sync interrupts for master's IOARRIN write */
1155 /* note that unlike asyncs, there can be no pending sync interrupts */
1156 /* at this time (this is a fresh context and master has not written */
1157 /* IOARRIN yet), so there is nothing to clear. */
1159 /* set LISN#, it is always sent to the context that wrote IOARRIN */
1160 for (i
= 0; i
< afu
->num_hwqs
; i
++) {
1161 hwq
= get_hwq(afu
, i
);
1163 writeq_be(SISL_MSI_SYNC_ERROR
, &hwq
->host_map
->ctx_ctrl
);
1164 writeq_be(SISL_ISTATUS_MASK
, &hwq
->host_map
->intr_mask
);
1169 * cxlflash_sync_err_irq() - interrupt handler for synchronous errors
1170 * @irq: Interrupt number.
1171 * @data: Private data provided at interrupt registration, the AFU.
1173 * Return: Always return IRQ_HANDLED.
1175 static irqreturn_t
cxlflash_sync_err_irq(int irq
, void *data
)
1177 struct hwq
*hwq
= (struct hwq
*)data
;
1178 struct cxlflash_cfg
*cfg
= hwq
->afu
->parent
;
1179 struct device
*dev
= &cfg
->dev
->dev
;
1183 reg
= readq_be(&hwq
->host_map
->intr_status
);
1184 reg_unmasked
= (reg
& SISL_ISTATUS_UNMASK
);
1186 if (reg_unmasked
== 0UL) {
1187 dev_err(dev
, "%s: spurious interrupt, intr_status=%016llx\n",
1189 goto cxlflash_sync_err_irq_exit
;
1192 dev_err(dev
, "%s: unexpected interrupt, intr_status=%016llx\n",
1195 writeq_be(reg_unmasked
, &hwq
->host_map
->intr_clear
);
1197 cxlflash_sync_err_irq_exit
:
1202 * process_hrrq() - process the read-response queue
1203 * @afu: AFU associated with the host.
1204 * @doneq: Queue of commands harvested from the RRQ.
1205 * @budget: Threshold of RRQ entries to process.
1207 * This routine must be called holding the disabled RRQ spin lock.
1209 * Return: The number of entries processed.
1211 static int process_hrrq(struct hwq
*hwq
, struct list_head
*doneq
, int budget
)
1213 struct afu
*afu
= hwq
->afu
;
1214 struct afu_cmd
*cmd
;
1215 struct sisl_ioasa
*ioasa
;
1216 struct sisl_ioarcb
*ioarcb
;
1217 bool toggle
= hwq
->toggle
;
1220 *hrrq_start
= hwq
->hrrq_start
,
1221 *hrrq_end
= hwq
->hrrq_end
,
1222 *hrrq_curr
= hwq
->hrrq_curr
;
1224 /* Process ready RRQ entries up to the specified budget (if any) */
1228 if ((entry
& SISL_RESP_HANDLE_T_BIT
) != toggle
)
1231 entry
&= ~SISL_RESP_HANDLE_T_BIT
;
1233 if (afu_is_sq_cmd_mode(afu
)) {
1234 ioasa
= (struct sisl_ioasa
*)entry
;
1235 cmd
= container_of(ioasa
, struct afu_cmd
, sa
);
1237 ioarcb
= (struct sisl_ioarcb
*)entry
;
1238 cmd
= container_of(ioarcb
, struct afu_cmd
, rcb
);
1241 list_add_tail(&cmd
->queue
, doneq
);
1243 /* Advance to next entry or wrap and flip the toggle bit */
1244 if (hrrq_curr
< hrrq_end
)
1247 hrrq_curr
= hrrq_start
;
1248 toggle
^= SISL_RESP_HANDLE_T_BIT
;
1251 atomic_inc(&hwq
->hsq_credits
);
1254 if (budget
> 0 && num_hrrq
>= budget
)
1258 hwq
->hrrq_curr
= hrrq_curr
;
1259 hwq
->toggle
= toggle
;
1265 * process_cmd_doneq() - process a queue of harvested RRQ commands
1266 * @doneq: Queue of completed commands.
1268 * Note that upon return the queue can no longer be trusted.
1270 static void process_cmd_doneq(struct list_head
*doneq
)
1272 struct afu_cmd
*cmd
, *tmp
;
1274 WARN_ON(list_empty(doneq
));
1276 list_for_each_entry_safe(cmd
, tmp
, doneq
, queue
)
1281 * cxlflash_irqpoll() - process a queue of harvested RRQ commands
1282 * @irqpoll: IRQ poll structure associated with queue to poll.
1283 * @budget: Threshold of RRQ entries to process per poll.
1285 * Return: The number of entries processed.
1287 static int cxlflash_irqpoll(struct irq_poll
*irqpoll
, int budget
)
1289 struct hwq
*hwq
= container_of(irqpoll
, struct hwq
, irqpoll
);
1290 unsigned long hrrq_flags
;
1292 int num_entries
= 0;
1294 spin_lock_irqsave(&hwq
->hrrq_slock
, hrrq_flags
);
1296 num_entries
= process_hrrq(hwq
, &doneq
, budget
);
1297 if (num_entries
< budget
)
1298 irq_poll_complete(irqpoll
);
1300 spin_unlock_irqrestore(&hwq
->hrrq_slock
, hrrq_flags
);
1302 process_cmd_doneq(&doneq
);
1307 * cxlflash_rrq_irq() - interrupt handler for read-response queue (normal path)
1308 * @irq: Interrupt number.
1309 * @data: Private data provided at interrupt registration, the AFU.
1311 * Return: IRQ_HANDLED or IRQ_NONE when no ready entries found.
1313 static irqreturn_t
cxlflash_rrq_irq(int irq
, void *data
)
1315 struct hwq
*hwq
= (struct hwq
*)data
;
1316 struct afu
*afu
= hwq
->afu
;
1317 unsigned long hrrq_flags
;
1319 int num_entries
= 0;
1321 spin_lock_irqsave(&hwq
->hrrq_slock
, hrrq_flags
);
1323 if (afu_is_irqpoll_enabled(afu
)) {
1324 irq_poll_sched(&hwq
->irqpoll
);
1325 spin_unlock_irqrestore(&hwq
->hrrq_slock
, hrrq_flags
);
1329 num_entries
= process_hrrq(hwq
, &doneq
, -1);
1330 spin_unlock_irqrestore(&hwq
->hrrq_slock
, hrrq_flags
);
1332 if (num_entries
== 0)
1335 process_cmd_doneq(&doneq
);
1340 * Asynchronous interrupt information table
1343 * - Order matters here as this array is indexed by bit position.
1345 * - The checkpatch script considers the BUILD_SISL_ASTATUS_FC_PORT macro
1346 * as complex and complains due to a lack of parentheses/braces.
1348 #define ASTATUS_FC(_a, _b, _c, _d) \
1349 { SISL_ASTATUS_FC##_a##_##_b, _c, _a, (_d) }
1351 #define BUILD_SISL_ASTATUS_FC_PORT(_a) \
1352 ASTATUS_FC(_a, LINK_UP, "link up", 0), \
1353 ASTATUS_FC(_a, LINK_DN, "link down", 0), \
1354 ASTATUS_FC(_a, LOGI_S, "login succeeded", SCAN_HOST), \
1355 ASTATUS_FC(_a, LOGI_F, "login failed", CLR_FC_ERROR), \
1356 ASTATUS_FC(_a, LOGI_R, "login timed out, retrying", LINK_RESET), \
1357 ASTATUS_FC(_a, CRC_T, "CRC threshold exceeded", LINK_RESET), \
1358 ASTATUS_FC(_a, LOGO, "target initiated LOGO", 0), \
1359 ASTATUS_FC(_a, OTHER, "other error", CLR_FC_ERROR | LINK_RESET)
1361 static const struct asyc_intr_info ainfo
[] = {
1362 BUILD_SISL_ASTATUS_FC_PORT(1),
1363 BUILD_SISL_ASTATUS_FC_PORT(0),
1364 BUILD_SISL_ASTATUS_FC_PORT(3),
1365 BUILD_SISL_ASTATUS_FC_PORT(2)
1369 * cxlflash_async_err_irq() - interrupt handler for asynchronous errors
1370 * @irq: Interrupt number.
1371 * @data: Private data provided at interrupt registration, the AFU.
1373 * Return: Always return IRQ_HANDLED.
1375 static irqreturn_t
cxlflash_async_err_irq(int irq
, void *data
)
1377 struct hwq
*hwq
= (struct hwq
*)data
;
1378 struct afu
*afu
= hwq
->afu
;
1379 struct cxlflash_cfg
*cfg
= afu
->parent
;
1380 struct device
*dev
= &cfg
->dev
->dev
;
1381 const struct asyc_intr_info
*info
;
1382 struct sisl_global_map __iomem
*global
= &afu
->afu_map
->global
;
1383 __be64 __iomem
*fc_port_regs
;
1389 reg
= readq_be(&global
->regs
.aintr_status
);
1390 reg_unmasked
= (reg
& SISL_ASTATUS_UNMASK
);
1392 if (unlikely(reg_unmasked
== 0)) {
1393 dev_err(dev
, "%s: spurious interrupt, aintr_status=%016llx\n",
1398 /* FYI, it is 'okay' to clear AFU status before FC_ERROR */
1399 writeq_be(reg_unmasked
, &global
->regs
.aintr_clear
);
1401 /* Check each bit that is on */
1402 for_each_set_bit(bit
, (ulong
*)®_unmasked
, BITS_PER_LONG
) {
1403 if (unlikely(bit
>= ARRAY_SIZE(ainfo
))) {
1409 if (unlikely(info
->status
!= 1ULL << bit
)) {
1415 fc_port_regs
= get_fc_port_regs(cfg
, port
);
1417 dev_err(dev
, "%s: FC Port %d -> %s, fc_status=%016llx\n",
1418 __func__
, port
, info
->desc
,
1419 readq_be(&fc_port_regs
[FC_STATUS
/ 8]));
1422 * Do link reset first, some OTHER errors will set FC_ERROR
1423 * again if cleared before or w/o a reset
1425 if (info
->action
& LINK_RESET
) {
1426 dev_err(dev
, "%s: FC Port %d: resetting link\n",
1428 cfg
->lr_state
= LINK_RESET_REQUIRED
;
1429 cfg
->lr_port
= port
;
1430 schedule_work(&cfg
->work_q
);
1433 if (info
->action
& CLR_FC_ERROR
) {
1434 reg
= readq_be(&fc_port_regs
[FC_ERROR
/ 8]);
1437 * Since all errors are unmasked, FC_ERROR and FC_ERRCAP
1438 * should be the same and tracing one is sufficient.
1441 dev_err(dev
, "%s: fc %d: clearing fc_error=%016llx\n",
1442 __func__
, port
, reg
);
1444 writeq_be(reg
, &fc_port_regs
[FC_ERROR
/ 8]);
1445 writeq_be(0, &fc_port_regs
[FC_ERRCAP
/ 8]);
1448 if (info
->action
& SCAN_HOST
) {
1449 atomic_inc(&cfg
->scan_host_needed
);
1450 schedule_work(&cfg
->work_q
);
1459 * start_context() - starts the master context
1460 * @cfg: Internal structure associated with the host.
1461 * @index: Index of the hardware queue.
1463 * Return: A success or failure value from CXL services.
1465 static int start_context(struct cxlflash_cfg
*cfg
, u32 index
)
1467 struct device
*dev
= &cfg
->dev
->dev
;
1468 struct hwq
*hwq
= get_hwq(cfg
->afu
, index
);
1471 rc
= cxl_start_context(hwq
->ctx
,
1472 hwq
->work
.work_element_descriptor
,
1475 dev_dbg(dev
, "%s: returning rc=%d\n", __func__
, rc
);
1480 * read_vpd() - obtains the WWPNs from VPD
1481 * @cfg: Internal structure associated with the host.
1482 * @wwpn: Array of size MAX_FC_PORTS to pass back WWPNs
1484 * Return: 0 on success, -errno on failure
1486 static int read_vpd(struct cxlflash_cfg
*cfg
, u64 wwpn
[])
1488 struct device
*dev
= &cfg
->dev
->dev
;
1489 struct pci_dev
*pdev
= cfg
->dev
;
1491 int ro_start
, ro_size
, i
, j
, k
;
1493 char vpd_data
[CXLFLASH_VPD_LEN
];
1494 char tmp_buf
[WWPN_BUF_LEN
] = { 0 };
1495 char *wwpn_vpd_tags
[MAX_FC_PORTS
] = { "V5", "V6", "V7", "V8" };
1497 /* Get the VPD data from the device */
1498 vpd_size
= cxl_read_adapter_vpd(pdev
, vpd_data
, sizeof(vpd_data
));
1499 if (unlikely(vpd_size
<= 0)) {
1500 dev_err(dev
, "%s: Unable to read VPD (size = %ld)\n",
1501 __func__
, vpd_size
);
1506 /* Get the read only section offset */
1507 ro_start
= pci_vpd_find_tag(vpd_data
, 0, vpd_size
,
1508 PCI_VPD_LRDT_RO_DATA
);
1509 if (unlikely(ro_start
< 0)) {
1510 dev_err(dev
, "%s: VPD Read-only data not found\n", __func__
);
1515 /* Get the read only section size, cap when extends beyond read VPD */
1516 ro_size
= pci_vpd_lrdt_size(&vpd_data
[ro_start
]);
1518 i
= ro_start
+ PCI_VPD_LRDT_TAG_SIZE
;
1519 if (unlikely((i
+ j
) > vpd_size
)) {
1520 dev_dbg(dev
, "%s: Might need to read more VPD (%d > %ld)\n",
1521 __func__
, (i
+ j
), vpd_size
);
1522 ro_size
= vpd_size
- i
;
1526 * Find the offset of the WWPN tag within the read only
1527 * VPD data and validate the found field (partials are
1528 * no good to us). Convert the ASCII data to an integer
1529 * value. Note that we must copy to a temporary buffer
1530 * because the conversion service requires that the ASCII
1531 * string be terminated.
1533 for (k
= 0; k
< cfg
->num_fc_ports
; k
++) {
1535 i
= ro_start
+ PCI_VPD_LRDT_TAG_SIZE
;
1537 i
= pci_vpd_find_info_keyword(vpd_data
, i
, j
, wwpn_vpd_tags
[k
]);
1538 if (unlikely(i
< 0)) {
1539 dev_err(dev
, "%s: Port %d WWPN not found in VPD\n",
1545 j
= pci_vpd_info_field_size(&vpd_data
[i
]);
1546 i
+= PCI_VPD_INFO_FLD_HDR_SIZE
;
1547 if (unlikely((i
+ j
> vpd_size
) || (j
!= WWPN_LEN
))) {
1548 dev_err(dev
, "%s: Port %d WWPN incomplete or bad VPD\n",
1554 memcpy(tmp_buf
, &vpd_data
[i
], WWPN_LEN
);
1555 rc
= kstrtoul(tmp_buf
, WWPN_LEN
, (ulong
*)&wwpn
[k
]);
1557 dev_err(dev
, "%s: WWPN conversion failed for port %d\n",
1563 dev_dbg(dev
, "%s: wwpn%d=%016llx\n", __func__
, k
, wwpn
[k
]);
1567 dev_dbg(dev
, "%s: returning rc=%d\n", __func__
, rc
);
1572 * init_pcr() - initialize the provisioning and control registers
1573 * @cfg: Internal structure associated with the host.
1575 * Also sets up fast access to the mapped registers and initializes AFU
1576 * command fields that never change.
1578 static void init_pcr(struct cxlflash_cfg
*cfg
)
1580 struct afu
*afu
= cfg
->afu
;
1581 struct sisl_ctrl_map __iomem
*ctrl_map
;
1585 for (i
= 0; i
< MAX_CONTEXT
; i
++) {
1586 ctrl_map
= &afu
->afu_map
->ctrls
[i
].ctrl
;
1587 /* Disrupt any clients that could be running */
1588 /* e.g. clients that survived a master restart */
1589 writeq_be(0, &ctrl_map
->rht_start
);
1590 writeq_be(0, &ctrl_map
->rht_cnt_id
);
1591 writeq_be(0, &ctrl_map
->ctx_cap
);
1594 /* Copy frequently used fields into hwq */
1595 for (i
= 0; i
< afu
->num_hwqs
; i
++) {
1596 hwq
= get_hwq(afu
, i
);
1598 hwq
->ctx_hndl
= (u16
) cxl_process_element(hwq
->ctx
);
1599 hwq
->host_map
= &afu
->afu_map
->hosts
[hwq
->ctx_hndl
].host
;
1600 hwq
->ctrl_map
= &afu
->afu_map
->ctrls
[hwq
->ctx_hndl
].ctrl
;
1602 /* Program the Endian Control for the master context */
1603 writeq_be(SISL_ENDIAN_CTRL
, &hwq
->host_map
->endian_ctrl
);
1608 * init_global() - initialize AFU global registers
1609 * @cfg: Internal structure associated with the host.
1611 static int init_global(struct cxlflash_cfg
*cfg
)
1613 struct afu
*afu
= cfg
->afu
;
1614 struct device
*dev
= &cfg
->dev
->dev
;
1616 struct sisl_host_map __iomem
*hmap
;
1617 __be64 __iomem
*fc_port_regs
;
1618 u64 wwpn
[MAX_FC_PORTS
]; /* wwpn of AFU ports */
1619 int i
= 0, num_ports
= 0;
1623 rc
= read_vpd(cfg
, &wwpn
[0]);
1625 dev_err(dev
, "%s: could not read vpd rc=%d\n", __func__
, rc
);
1629 /* Set up RRQ and SQ in HWQ for master issued cmds */
1630 for (i
= 0; i
< afu
->num_hwqs
; i
++) {
1631 hwq
= get_hwq(afu
, i
);
1632 hmap
= hwq
->host_map
;
1634 writeq_be((u64
) hwq
->hrrq_start
, &hmap
->rrq_start
);
1635 writeq_be((u64
) hwq
->hrrq_end
, &hmap
->rrq_end
);
1637 if (afu_is_sq_cmd_mode(afu
)) {
1638 writeq_be((u64
)hwq
->hsq_start
, &hmap
->sq_start
);
1639 writeq_be((u64
)hwq
->hsq_end
, &hmap
->sq_end
);
1643 /* AFU configuration */
1644 reg
= readq_be(&afu
->afu_map
->global
.regs
.afu_config
);
1645 reg
|= SISL_AFUCONF_AR_ALL
|SISL_AFUCONF_ENDIAN
;
1646 /* enable all auto retry options and control endianness */
1647 /* leave others at default: */
1648 /* CTX_CAP write protected, mbox_r does not clear on read and */
1649 /* checker on if dual afu */
1650 writeq_be(reg
, &afu
->afu_map
->global
.regs
.afu_config
);
1652 /* Global port select: select either port */
1653 if (afu
->internal_lun
) {
1654 /* Only use port 0 */
1655 writeq_be(PORT0
, &afu
->afu_map
->global
.regs
.afu_port_sel
);
1658 writeq_be(PORT_MASK(cfg
->num_fc_ports
),
1659 &afu
->afu_map
->global
.regs
.afu_port_sel
);
1660 num_ports
= cfg
->num_fc_ports
;
1663 for (i
= 0; i
< num_ports
; i
++) {
1664 fc_port_regs
= get_fc_port_regs(cfg
, i
);
1666 /* Unmask all errors (but they are still masked at AFU) */
1667 writeq_be(0, &fc_port_regs
[FC_ERRMSK
/ 8]);
1668 /* Clear CRC error cnt & set a threshold */
1669 (void)readq_be(&fc_port_regs
[FC_CNT_CRCERR
/ 8]);
1670 writeq_be(MC_CRC_THRESH
, &fc_port_regs
[FC_CRC_THRESH
/ 8]);
1672 /* Set WWPNs. If already programmed, wwpn[i] is 0 */
1674 afu_set_wwpn(afu
, i
, &fc_port_regs
[0], wwpn
[i
]);
1675 /* Programming WWPN back to back causes additional
1676 * offline/online transitions and a PLOGI
1681 /* Set up master's own CTX_CAP to allow real mode, host translation */
1682 /* tables, afu cmds and read/write GSCSI cmds. */
1683 /* First, unlock ctx_cap write by reading mbox */
1684 for (i
= 0; i
< afu
->num_hwqs
; i
++) {
1685 hwq
= get_hwq(afu
, i
);
1687 (void)readq_be(&hwq
->ctrl_map
->mbox_r
); /* unlock ctx_cap */
1688 writeq_be((SISL_CTX_CAP_REAL_MODE
| SISL_CTX_CAP_HOST_XLATE
|
1689 SISL_CTX_CAP_READ_CMD
| SISL_CTX_CAP_WRITE_CMD
|
1690 SISL_CTX_CAP_AFU_CMD
| SISL_CTX_CAP_GSCSI_CMD
),
1691 &hwq
->ctrl_map
->ctx_cap
);
1693 /* Initialize heartbeat */
1694 afu
->hb
= readq_be(&afu
->afu_map
->global
.regs
.afu_hb
);
1700 * start_afu() - initializes and starts the AFU
1701 * @cfg: Internal structure associated with the host.
1703 static int start_afu(struct cxlflash_cfg
*cfg
)
1705 struct afu
*afu
= cfg
->afu
;
1706 struct device
*dev
= &cfg
->dev
->dev
;
1713 /* Initialize each HWQ */
1714 for (i
= 0; i
< afu
->num_hwqs
; i
++) {
1715 hwq
= get_hwq(afu
, i
);
1717 /* After an AFU reset, RRQ entries are stale, clear them */
1718 memset(&hwq
->rrq_entry
, 0, sizeof(hwq
->rrq_entry
));
1720 /* Initialize RRQ pointers */
1721 hwq
->hrrq_start
= &hwq
->rrq_entry
[0];
1722 hwq
->hrrq_end
= &hwq
->rrq_entry
[NUM_RRQ_ENTRY
- 1];
1723 hwq
->hrrq_curr
= hwq
->hrrq_start
;
1726 /* Initialize spin locks */
1727 spin_lock_init(&hwq
->hrrq_slock
);
1728 spin_lock_init(&hwq
->hsq_slock
);
1731 if (afu_is_sq_cmd_mode(afu
)) {
1732 memset(&hwq
->sq
, 0, sizeof(hwq
->sq
));
1733 hwq
->hsq_start
= &hwq
->sq
[0];
1734 hwq
->hsq_end
= &hwq
->sq
[NUM_SQ_ENTRY
- 1];
1735 hwq
->hsq_curr
= hwq
->hsq_start
;
1737 atomic_set(&hwq
->hsq_credits
, NUM_SQ_ENTRY
- 1);
1740 /* Initialize IRQ poll */
1741 if (afu_is_irqpoll_enabled(afu
))
1742 irq_poll_init(&hwq
->irqpoll
, afu
->irqpoll_weight
,
1747 rc
= init_global(cfg
);
1749 dev_dbg(dev
, "%s: returning rc=%d\n", __func__
, rc
);
1754 * init_intr() - setup interrupt handlers for the master context
1755 * @cfg: Internal structure associated with the host.
1756 * @hwq: Hardware queue to initialize.
1758 * Return: 0 on success, -errno on failure
1760 static enum undo_level
init_intr(struct cxlflash_cfg
*cfg
,
1763 struct device
*dev
= &cfg
->dev
->dev
;
1764 struct cxl_context
*ctx
= hwq
->ctx
;
1766 enum undo_level level
= UNDO_NOOP
;
1767 bool is_primary_hwq
= (hwq
->index
== PRIMARY_HWQ
);
1768 int num_irqs
= is_primary_hwq
? 3 : 2;
1770 rc
= cxl_allocate_afu_irqs(ctx
, num_irqs
);
1772 dev_err(dev
, "%s: allocate_afu_irqs failed rc=%d\n",
1778 rc
= cxl_map_afu_irq(ctx
, 1, cxlflash_sync_err_irq
, hwq
,
1779 "SISL_MSI_SYNC_ERROR");
1780 if (unlikely(rc
<= 0)) {
1781 dev_err(dev
, "%s: SISL_MSI_SYNC_ERROR map failed\n", __func__
);
1786 rc
= cxl_map_afu_irq(ctx
, 2, cxlflash_rrq_irq
, hwq
,
1787 "SISL_MSI_RRQ_UPDATED");
1788 if (unlikely(rc
<= 0)) {
1789 dev_err(dev
, "%s: SISL_MSI_RRQ_UPDATED map failed\n", __func__
);
1794 /* SISL_MSI_ASYNC_ERROR is setup only for the primary HWQ */
1795 if (!is_primary_hwq
)
1798 rc
= cxl_map_afu_irq(ctx
, 3, cxlflash_async_err_irq
, hwq
,
1799 "SISL_MSI_ASYNC_ERROR");
1800 if (unlikely(rc
<= 0)) {
1801 dev_err(dev
, "%s: SISL_MSI_ASYNC_ERROR map failed\n", __func__
);
1810 * init_mc() - create and register as the master context
1811 * @cfg: Internal structure associated with the host.
1812 * index: HWQ Index of the master context.
1814 * Return: 0 on success, -errno on failure
1816 static int init_mc(struct cxlflash_cfg
*cfg
, u32 index
)
1818 struct cxl_context
*ctx
;
1819 struct device
*dev
= &cfg
->dev
->dev
;
1820 struct hwq
*hwq
= get_hwq(cfg
->afu
, index
);
1822 enum undo_level level
;
1824 hwq
->afu
= cfg
->afu
;
1827 if (index
== PRIMARY_HWQ
)
1828 ctx
= cxl_get_context(cfg
->dev
);
1830 ctx
= cxl_dev_context_init(cfg
->dev
);
1831 if (unlikely(!ctx
)) {
1839 /* Set it up as a master with the CXL */
1840 cxl_set_master(ctx
);
1842 /* Reset AFU when initializing primary context */
1843 if (index
== PRIMARY_HWQ
) {
1844 rc
= cxl_afu_reset(ctx
);
1846 dev_err(dev
, "%s: AFU reset failed rc=%d\n",
1852 level
= init_intr(cfg
, hwq
);
1853 if (unlikely(level
)) {
1854 dev_err(dev
, "%s: interrupt init failed rc=%d\n", __func__
, rc
);
1858 /* This performs the equivalent of the CXL_IOCTL_START_WORK.
1859 * The CXL_IOCTL_GET_PROCESS_ELEMENT is implicit in the process
1860 * element (pe) that is embedded in the context (ctx)
1862 rc
= start_context(cfg
, index
);
1864 dev_err(dev
, "%s: start context failed rc=%d\n", __func__
, rc
);
1865 level
= UNMAP_THREE
;
1870 dev_dbg(dev
, "%s: returning rc=%d\n", __func__
, rc
);
1873 term_intr(cfg
, level
, index
);
1874 if (index
!= PRIMARY_HWQ
)
1875 cxl_release_context(ctx
);
1882 * get_num_afu_ports() - determines and configures the number of AFU ports
1883 * @cfg: Internal structure associated with the host.
1885 * This routine determines the number of AFU ports by converting the global
1886 * port selection mask. The converted value is only valid following an AFU
1887 * reset (explicit or power-on). This routine must be invoked shortly after
1888 * mapping as other routines are dependent on the number of ports during the
1889 * initialization sequence.
1891 * To support legacy AFUs that might not have reflected an initial global
1892 * port mask (value read is 0), default to the number of ports originally
1893 * supported by the cxlflash driver (2) before hardware with other port
1894 * offerings was introduced.
1896 static void get_num_afu_ports(struct cxlflash_cfg
*cfg
)
1898 struct afu
*afu
= cfg
->afu
;
1899 struct device
*dev
= &cfg
->dev
->dev
;
1901 int num_fc_ports
= LEGACY_FC_PORTS
;
1903 port_mask
= readq_be(&afu
->afu_map
->global
.regs
.afu_port_sel
);
1904 if (port_mask
!= 0ULL)
1905 num_fc_ports
= min(ilog2(port_mask
) + 1, MAX_FC_PORTS
);
1907 dev_dbg(dev
, "%s: port_mask=%016llx num_fc_ports=%d\n",
1908 __func__
, port_mask
, num_fc_ports
);
1910 cfg
->num_fc_ports
= num_fc_ports
;
1911 cfg
->host
->max_channel
= PORTNUM2CHAN(num_fc_ports
);
1915 * init_afu() - setup as master context and start AFU
1916 * @cfg: Internal structure associated with the host.
1918 * This routine is a higher level of control for configuring the
1919 * AFU on probe and reset paths.
1921 * Return: 0 on success, -errno on failure
1923 static int init_afu(struct cxlflash_cfg
*cfg
)
1927 struct afu
*afu
= cfg
->afu
;
1928 struct device
*dev
= &cfg
->dev
->dev
;
1932 cxl_perst_reloads_same_image(cfg
->cxl_afu
, true);
1934 afu
->num_hwqs
= afu
->desired_hwqs
;
1935 for (i
= 0; i
< afu
->num_hwqs
; i
++) {
1936 rc
= init_mc(cfg
, i
);
1938 dev_err(dev
, "%s: init_mc failed rc=%d index=%d\n",
1944 /* Map the entire MMIO space of the AFU using the first context */
1945 hwq
= get_hwq(afu
, PRIMARY_HWQ
);
1946 afu
->afu_map
= cxl_psa_map(hwq
->ctx
);
1947 if (!afu
->afu_map
) {
1948 dev_err(dev
, "%s: cxl_psa_map failed\n", __func__
);
1953 /* No byte reverse on reading afu_version or string will be backwards */
1954 reg
= readq(&afu
->afu_map
->global
.regs
.afu_version
);
1955 memcpy(afu
->version
, ®
, sizeof(reg
));
1956 afu
->interface_version
=
1957 readq_be(&afu
->afu_map
->global
.regs
.interface_version
);
1958 if ((afu
->interface_version
+ 1) == 0) {
1959 dev_err(dev
, "Back level AFU, please upgrade. AFU version %s "
1960 "interface version %016llx\n", afu
->version
,
1961 afu
->interface_version
);
1966 if (afu_is_sq_cmd_mode(afu
)) {
1967 afu
->send_cmd
= send_cmd_sq
;
1968 afu
->context_reset
= context_reset_sq
;
1970 afu
->send_cmd
= send_cmd_ioarrin
;
1971 afu
->context_reset
= context_reset_ioarrin
;
1974 dev_dbg(dev
, "%s: afu_ver=%s interface_ver=%016llx\n", __func__
,
1975 afu
->version
, afu
->interface_version
);
1977 get_num_afu_ports(cfg
);
1979 rc
= start_afu(cfg
);
1981 dev_err(dev
, "%s: start_afu failed, rc=%d\n", __func__
, rc
);
1985 afu_err_intr_init(cfg
->afu
);
1986 for (i
= 0; i
< afu
->num_hwqs
; i
++) {
1987 hwq
= get_hwq(afu
, i
);
1989 hwq
->room
= readq_be(&hwq
->host_map
->cmd_room
);
1992 /* Restore the LUN mappings */
1993 cxlflash_restore_luntable(cfg
);
1995 dev_dbg(dev
, "%s: returning rc=%d\n", __func__
, rc
);
1999 for (i
= afu
->num_hwqs
- 1; i
>= 0; i
--) {
2000 term_intr(cfg
, UNMAP_THREE
, i
);
2007 * cxlflash_afu_sync() - builds and sends an AFU sync command
2008 * @afu: AFU associated with the host.
2009 * @ctx_hndl_u: Identifies context requesting sync.
2010 * @res_hndl_u: Identifies resource requesting sync.
2011 * @mode: Type of sync to issue (lightweight, heavyweight, global).
2013 * The AFU can only take 1 sync command at a time. This routine enforces this
2014 * limitation by using a mutex to provide exclusive access to the AFU during
2015 * the sync. This design point requires calling threads to not be on interrupt
2016 * context due to the possibility of sleeping during concurrent sync operations.
2018 * AFU sync operations are only necessary and allowed when the device is
2019 * operating normally. When not operating normally, sync requests can occur as
2020 * part of cleaning up resources associated with an adapter prior to removal.
2021 * In this scenario, these requests are simply ignored (safe due to the AFU
2028 int cxlflash_afu_sync(struct afu
*afu
, ctx_hndl_t ctx_hndl_u
,
2029 res_hndl_t res_hndl_u
, u8 mode
)
2031 struct cxlflash_cfg
*cfg
= afu
->parent
;
2032 struct device
*dev
= &cfg
->dev
->dev
;
2033 struct afu_cmd
*cmd
= NULL
;
2034 struct hwq
*hwq
= get_hwq(afu
, PRIMARY_HWQ
);
2037 static DEFINE_MUTEX(sync_active
);
2039 if (cfg
->state
!= STATE_NORMAL
) {
2040 dev_dbg(dev
, "%s: Sync not required state=%u\n",
2041 __func__
, cfg
->state
);
2045 mutex_lock(&sync_active
);
2046 atomic_inc(&afu
->cmds_active
);
2047 buf
= kzalloc(sizeof(*cmd
) + __alignof__(*cmd
) - 1, GFP_KERNEL
);
2048 if (unlikely(!buf
)) {
2049 dev_err(dev
, "%s: no memory for command\n", __func__
);
2054 cmd
= (struct afu_cmd
*)PTR_ALIGN(buf
, __alignof__(*cmd
));
2055 init_completion(&cmd
->cevent
);
2057 cmd
->hwq_index
= hwq
->index
;
2059 dev_dbg(dev
, "%s: afu=%p cmd=%p %d\n", __func__
, afu
, cmd
, ctx_hndl_u
);
2061 cmd
->rcb
.req_flags
= SISL_REQ_FLAGS_AFU_CMD
;
2062 cmd
->rcb
.ctx_id
= hwq
->ctx_hndl
;
2063 cmd
->rcb
.msi
= SISL_MSI_RRQ_UPDATED
;
2064 cmd
->rcb
.timeout
= MC_AFU_SYNC_TIMEOUT
;
2066 cmd
->rcb
.cdb
[0] = 0xC0; /* AFU Sync */
2067 cmd
->rcb
.cdb
[1] = mode
;
2069 /* The cdb is aligned, no unaligned accessors required */
2070 *((__be16
*)&cmd
->rcb
.cdb
[2]) = cpu_to_be16(ctx_hndl_u
);
2071 *((__be32
*)&cmd
->rcb
.cdb
[4]) = cpu_to_be32(res_hndl_u
);
2073 rc
= afu
->send_cmd(afu
, cmd
);
2077 rc
= wait_resp(afu
, cmd
);
2081 atomic_dec(&afu
->cmds_active
);
2082 mutex_unlock(&sync_active
);
2084 dev_dbg(dev
, "%s: returning rc=%d\n", __func__
, rc
);
2089 * afu_reset() - resets the AFU
2090 * @cfg: Internal structure associated with the host.
2092 * Return: 0 on success, -errno on failure
2094 static int afu_reset(struct cxlflash_cfg
*cfg
)
2096 struct device
*dev
= &cfg
->dev
->dev
;
2099 /* Stop the context before the reset. Since the context is
2100 * no longer available restart it after the reset is complete
2106 dev_dbg(dev
, "%s: returning rc=%d\n", __func__
, rc
);
2111 * drain_ioctls() - wait until all currently executing ioctls have completed
2112 * @cfg: Internal structure associated with the host.
2114 * Obtain write access to read/write semaphore that wraps ioctl
2115 * handling to 'drain' ioctls currently executing.
2117 static void drain_ioctls(struct cxlflash_cfg
*cfg
)
2119 down_write(&cfg
->ioctl_rwsem
);
2120 up_write(&cfg
->ioctl_rwsem
);
2124 * cxlflash_eh_device_reset_handler() - reset a single LUN
2125 * @scp: SCSI command to send.
2128 * SUCCESS as defined in scsi/scsi.h
2129 * FAILED as defined in scsi/scsi.h
2131 static int cxlflash_eh_device_reset_handler(struct scsi_cmnd
*scp
)
2134 struct Scsi_Host
*host
= scp
->device
->host
;
2135 struct cxlflash_cfg
*cfg
= shost_priv(host
);
2136 struct device
*dev
= &cfg
->dev
->dev
;
2137 struct afu
*afu
= cfg
->afu
;
2140 dev_dbg(dev
, "%s: (scp=%p) %d/%d/%d/%llu "
2141 "cdb=(%08x-%08x-%08x-%08x)\n", __func__
, scp
, host
->host_no
,
2142 scp
->device
->channel
, scp
->device
->id
, scp
->device
->lun
,
2143 get_unaligned_be32(&((u32
*)scp
->cmnd
)[0]),
2144 get_unaligned_be32(&((u32
*)scp
->cmnd
)[1]),
2145 get_unaligned_be32(&((u32
*)scp
->cmnd
)[2]),
2146 get_unaligned_be32(&((u32
*)scp
->cmnd
)[3]));
2149 switch (cfg
->state
) {
2151 rcr
= send_tmf(afu
, scp
, TMF_LUN_RESET
);
2156 wait_event(cfg
->reset_waitq
, cfg
->state
!= STATE_RESET
);
2163 dev_dbg(dev
, "%s: returning rc=%d\n", __func__
, rc
);
2168 * cxlflash_eh_host_reset_handler() - reset the host adapter
2169 * @scp: SCSI command from stack identifying host.
2171 * Following a reset, the state is evaluated again in case an EEH occurred
2172 * during the reset. In such a scenario, the host reset will either yield
2173 * until the EEH recovery is complete or return success or failure based
2174 * upon the current device state.
2177 * SUCCESS as defined in scsi/scsi.h
2178 * FAILED as defined in scsi/scsi.h
2180 static int cxlflash_eh_host_reset_handler(struct scsi_cmnd
*scp
)
2184 struct Scsi_Host
*host
= scp
->device
->host
;
2185 struct cxlflash_cfg
*cfg
= shost_priv(host
);
2186 struct device
*dev
= &cfg
->dev
->dev
;
2188 dev_dbg(dev
, "%s: (scp=%p) %d/%d/%d/%llu "
2189 "cdb=(%08x-%08x-%08x-%08x)\n", __func__
, scp
, host
->host_no
,
2190 scp
->device
->channel
, scp
->device
->id
, scp
->device
->lun
,
2191 get_unaligned_be32(&((u32
*)scp
->cmnd
)[0]),
2192 get_unaligned_be32(&((u32
*)scp
->cmnd
)[1]),
2193 get_unaligned_be32(&((u32
*)scp
->cmnd
)[2]),
2194 get_unaligned_be32(&((u32
*)scp
->cmnd
)[3]));
2196 switch (cfg
->state
) {
2198 cfg
->state
= STATE_RESET
;
2200 cxlflash_mark_contexts_error(cfg
);
2201 rcr
= afu_reset(cfg
);
2204 cfg
->state
= STATE_FAILTERM
;
2206 cfg
->state
= STATE_NORMAL
;
2207 wake_up_all(&cfg
->reset_waitq
);
2211 wait_event(cfg
->reset_waitq
, cfg
->state
!= STATE_RESET
);
2212 if (cfg
->state
== STATE_NORMAL
)
2220 dev_dbg(dev
, "%s: returning rc=%d\n", __func__
, rc
);
2225 * cxlflash_change_queue_depth() - change the queue depth for the device
2226 * @sdev: SCSI device destined for queue depth change.
2227 * @qdepth: Requested queue depth value to set.
2229 * The requested queue depth is capped to the maximum supported value.
2231 * Return: The actual queue depth set.
2233 static int cxlflash_change_queue_depth(struct scsi_device
*sdev
, int qdepth
)
2236 if (qdepth
> CXLFLASH_MAX_CMDS_PER_LUN
)
2237 qdepth
= CXLFLASH_MAX_CMDS_PER_LUN
;
2239 scsi_change_queue_depth(sdev
, qdepth
);
2240 return sdev
->queue_depth
;
2244 * cxlflash_show_port_status() - queries and presents the current port status
2245 * @port: Desired port for status reporting.
2246 * @cfg: Internal structure associated with the host.
2247 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
2249 * Return: The size of the ASCII string returned in @buf or -EINVAL.
2251 static ssize_t
cxlflash_show_port_status(u32 port
,
2252 struct cxlflash_cfg
*cfg
,
2255 struct device
*dev
= &cfg
->dev
->dev
;
2258 __be64 __iomem
*fc_port_regs
;
2260 WARN_ON(port
>= MAX_FC_PORTS
);
2262 if (port
>= cfg
->num_fc_ports
) {
2263 dev_info(dev
, "%s: Port %d not supported on this card.\n",
2268 fc_port_regs
= get_fc_port_regs(cfg
, port
);
2269 status
= readq_be(&fc_port_regs
[FC_MTIP_STATUS
/ 8]);
2270 status
&= FC_MTIP_STATUS_MASK
;
2272 if (status
== FC_MTIP_STATUS_ONLINE
)
2273 disp_status
= "online";
2274 else if (status
== FC_MTIP_STATUS_OFFLINE
)
2275 disp_status
= "offline";
2277 disp_status
= "unknown";
2279 return scnprintf(buf
, PAGE_SIZE
, "%s\n", disp_status
);
2283 * port0_show() - queries and presents the current status of port 0
2284 * @dev: Generic device associated with the host owning the port.
2285 * @attr: Device attribute representing the port.
2286 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
2288 * Return: The size of the ASCII string returned in @buf.
2290 static ssize_t
port0_show(struct device
*dev
,
2291 struct device_attribute
*attr
,
2294 struct cxlflash_cfg
*cfg
= shost_priv(class_to_shost(dev
));
2296 return cxlflash_show_port_status(0, cfg
, buf
);
2300 * port1_show() - queries and presents the current status of port 1
2301 * @dev: Generic device associated with the host owning the port.
2302 * @attr: Device attribute representing the port.
2303 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
2305 * Return: The size of the ASCII string returned in @buf.
2307 static ssize_t
port1_show(struct device
*dev
,
2308 struct device_attribute
*attr
,
2311 struct cxlflash_cfg
*cfg
= shost_priv(class_to_shost(dev
));
2313 return cxlflash_show_port_status(1, cfg
, buf
);
2317 * port2_show() - queries and presents the current status of port 2
2318 * @dev: Generic device associated with the host owning the port.
2319 * @attr: Device attribute representing the port.
2320 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
2322 * Return: The size of the ASCII string returned in @buf.
2324 static ssize_t
port2_show(struct device
*dev
,
2325 struct device_attribute
*attr
,
2328 struct cxlflash_cfg
*cfg
= shost_priv(class_to_shost(dev
));
2330 return cxlflash_show_port_status(2, cfg
, buf
);
2334 * port3_show() - queries and presents the current status of port 3
2335 * @dev: Generic device associated with the host owning the port.
2336 * @attr: Device attribute representing the port.
2337 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
2339 * Return: The size of the ASCII string returned in @buf.
2341 static ssize_t
port3_show(struct device
*dev
,
2342 struct device_attribute
*attr
,
2345 struct cxlflash_cfg
*cfg
= shost_priv(class_to_shost(dev
));
2347 return cxlflash_show_port_status(3, cfg
, buf
);
2351 * lun_mode_show() - presents the current LUN mode of the host
2352 * @dev: Generic device associated with the host.
2353 * @attr: Device attribute representing the LUN mode.
2354 * @buf: Buffer of length PAGE_SIZE to report back the LUN mode in ASCII.
2356 * Return: The size of the ASCII string returned in @buf.
2358 static ssize_t
lun_mode_show(struct device
*dev
,
2359 struct device_attribute
*attr
, char *buf
)
2361 struct cxlflash_cfg
*cfg
= shost_priv(class_to_shost(dev
));
2362 struct afu
*afu
= cfg
->afu
;
2364 return scnprintf(buf
, PAGE_SIZE
, "%u\n", afu
->internal_lun
);
2368 * lun_mode_store() - sets the LUN mode of the host
2369 * @dev: Generic device associated with the host.
2370 * @attr: Device attribute representing the LUN mode.
2371 * @buf: Buffer of length PAGE_SIZE containing the LUN mode in ASCII.
2372 * @count: Length of data resizing in @buf.
2374 * The CXL Flash AFU supports a dummy LUN mode where the external
2375 * links and storage are not required. Space on the FPGA is used
2376 * to create 1 or 2 small LUNs which are presented to the system
2377 * as if they were a normal storage device. This feature is useful
2378 * during development and also provides manufacturing with a way
2379 * to test the AFU without an actual device.
2381 * 0 = external LUN[s] (default)
2382 * 1 = internal LUN (1 x 64K, 512B blocks, id 0)
2383 * 2 = internal LUN (1 x 64K, 4K blocks, id 0)
2384 * 3 = internal LUN (2 x 32K, 512B blocks, ids 0,1)
2385 * 4 = internal LUN (2 x 32K, 4K blocks, ids 0,1)
2387 * Return: The size of the ASCII string returned in @buf.
2389 static ssize_t
lun_mode_store(struct device
*dev
,
2390 struct device_attribute
*attr
,
2391 const char *buf
, size_t count
)
2393 struct Scsi_Host
*shost
= class_to_shost(dev
);
2394 struct cxlflash_cfg
*cfg
= shost_priv(shost
);
2395 struct afu
*afu
= cfg
->afu
;
2399 rc
= kstrtouint(buf
, 10, &lun_mode
);
2400 if (!rc
&& (lun_mode
< 5) && (lun_mode
!= afu
->internal_lun
)) {
2401 afu
->internal_lun
= lun_mode
;
2404 * When configured for internal LUN, there is only one channel,
2405 * channel number 0, else there will be one less than the number
2406 * of fc ports for this card.
2408 if (afu
->internal_lun
)
2409 shost
->max_channel
= 0;
2411 shost
->max_channel
= PORTNUM2CHAN(cfg
->num_fc_ports
);
2414 scsi_scan_host(cfg
->host
);
2421 * ioctl_version_show() - presents the current ioctl version of the host
2422 * @dev: Generic device associated with the host.
2423 * @attr: Device attribute representing the ioctl version.
2424 * @buf: Buffer of length PAGE_SIZE to report back the ioctl version.
2426 * Return: The size of the ASCII string returned in @buf.
2428 static ssize_t
ioctl_version_show(struct device
*dev
,
2429 struct device_attribute
*attr
, char *buf
)
2431 return scnprintf(buf
, PAGE_SIZE
, "%u\n", DK_CXLFLASH_VERSION_0
);
2435 * cxlflash_show_port_lun_table() - queries and presents the port LUN table
2436 * @port: Desired port for status reporting.
2437 * @cfg: Internal structure associated with the host.
2438 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
2440 * Return: The size of the ASCII string returned in @buf or -EINVAL.
2442 static ssize_t
cxlflash_show_port_lun_table(u32 port
,
2443 struct cxlflash_cfg
*cfg
,
2446 struct device
*dev
= &cfg
->dev
->dev
;
2447 __be64 __iomem
*fc_port_luns
;
2451 WARN_ON(port
>= MAX_FC_PORTS
);
2453 if (port
>= cfg
->num_fc_ports
) {
2454 dev_info(dev
, "%s: Port %d not supported on this card.\n",
2459 fc_port_luns
= get_fc_port_luns(cfg
, port
);
2461 for (i
= 0; i
< CXLFLASH_NUM_VLUNS
; i
++)
2462 bytes
+= scnprintf(buf
+ bytes
, PAGE_SIZE
- bytes
,
2464 i
, readq_be(&fc_port_luns
[i
]));
2469 * port0_lun_table_show() - presents the current LUN table of port 0
2470 * @dev: Generic device associated with the host owning the port.
2471 * @attr: Device attribute representing the port.
2472 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
2474 * Return: The size of the ASCII string returned in @buf.
2476 static ssize_t
port0_lun_table_show(struct device
*dev
,
2477 struct device_attribute
*attr
,
2480 struct cxlflash_cfg
*cfg
= shost_priv(class_to_shost(dev
));
2482 return cxlflash_show_port_lun_table(0, cfg
, buf
);
2486 * port1_lun_table_show() - presents the current LUN table of port 1
2487 * @dev: Generic device associated with the host owning the port.
2488 * @attr: Device attribute representing the port.
2489 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
2491 * Return: The size of the ASCII string returned in @buf.
2493 static ssize_t
port1_lun_table_show(struct device
*dev
,
2494 struct device_attribute
*attr
,
2497 struct cxlflash_cfg
*cfg
= shost_priv(class_to_shost(dev
));
2499 return cxlflash_show_port_lun_table(1, cfg
, buf
);
2503 * port2_lun_table_show() - presents the current LUN table of port 2
2504 * @dev: Generic device associated with the host owning the port.
2505 * @attr: Device attribute representing the port.
2506 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
2508 * Return: The size of the ASCII string returned in @buf.
2510 static ssize_t
port2_lun_table_show(struct device
*dev
,
2511 struct device_attribute
*attr
,
2514 struct cxlflash_cfg
*cfg
= shost_priv(class_to_shost(dev
));
2516 return cxlflash_show_port_lun_table(2, cfg
, buf
);
2520 * port3_lun_table_show() - presents the current LUN table of port 3
2521 * @dev: Generic device associated with the host owning the port.
2522 * @attr: Device attribute representing the port.
2523 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
2525 * Return: The size of the ASCII string returned in @buf.
2527 static ssize_t
port3_lun_table_show(struct device
*dev
,
2528 struct device_attribute
*attr
,
2531 struct cxlflash_cfg
*cfg
= shost_priv(class_to_shost(dev
));
2533 return cxlflash_show_port_lun_table(3, cfg
, buf
);
2537 * irqpoll_weight_show() - presents the current IRQ poll weight for the host
2538 * @dev: Generic device associated with the host.
2539 * @attr: Device attribute representing the IRQ poll weight.
2540 * @buf: Buffer of length PAGE_SIZE to report back the current IRQ poll
2543 * An IRQ poll weight of 0 indicates polling is disabled.
2545 * Return: The size of the ASCII string returned in @buf.
2547 static ssize_t
irqpoll_weight_show(struct device
*dev
,
2548 struct device_attribute
*attr
, char *buf
)
2550 struct cxlflash_cfg
*cfg
= shost_priv(class_to_shost(dev
));
2551 struct afu
*afu
= cfg
->afu
;
2553 return scnprintf(buf
, PAGE_SIZE
, "%u\n", afu
->irqpoll_weight
);
2557 * irqpoll_weight_store() - sets the current IRQ poll weight for the host
2558 * @dev: Generic device associated with the host.
2559 * @attr: Device attribute representing the IRQ poll weight.
2560 * @buf: Buffer of length PAGE_SIZE containing the desired IRQ poll
2562 * @count: Length of data resizing in @buf.
2564 * An IRQ poll weight of 0 indicates polling is disabled.
2566 * Return: The size of the ASCII string returned in @buf.
2568 static ssize_t
irqpoll_weight_store(struct device
*dev
,
2569 struct device_attribute
*attr
,
2570 const char *buf
, size_t count
)
2572 struct cxlflash_cfg
*cfg
= shost_priv(class_to_shost(dev
));
2573 struct device
*cfgdev
= &cfg
->dev
->dev
;
2574 struct afu
*afu
= cfg
->afu
;
2579 rc
= kstrtouint(buf
, 10, &weight
);
2585 "Invalid IRQ poll weight. It must be 256 or less.\n");
2589 if (weight
== afu
->irqpoll_weight
) {
2591 "Current IRQ poll weight has the same weight.\n");
2595 if (afu_is_irqpoll_enabled(afu
)) {
2596 for (i
= 0; i
< afu
->num_hwqs
; i
++) {
2597 hwq
= get_hwq(afu
, i
);
2599 irq_poll_disable(&hwq
->irqpoll
);
2603 afu
->irqpoll_weight
= weight
;
2606 for (i
= 0; i
< afu
->num_hwqs
; i
++) {
2607 hwq
= get_hwq(afu
, i
);
2609 irq_poll_init(&hwq
->irqpoll
, weight
, cxlflash_irqpoll
);
2617 * num_hwqs_show() - presents the number of hardware queues for the host
2618 * @dev: Generic device associated with the host.
2619 * @attr: Device attribute representing the number of hardware queues.
2620 * @buf: Buffer of length PAGE_SIZE to report back the number of hardware
2623 * Return: The size of the ASCII string returned in @buf.
2625 static ssize_t
num_hwqs_show(struct device
*dev
,
2626 struct device_attribute
*attr
, char *buf
)
2628 struct cxlflash_cfg
*cfg
= shost_priv(class_to_shost(dev
));
2629 struct afu
*afu
= cfg
->afu
;
2631 return scnprintf(buf
, PAGE_SIZE
, "%u\n", afu
->num_hwqs
);
2635 * num_hwqs_store() - sets the number of hardware queues for the host
2636 * @dev: Generic device associated with the host.
2637 * @attr: Device attribute representing the number of hardware queues.
2638 * @buf: Buffer of length PAGE_SIZE containing the number of hardware
2640 * @count: Length of data resizing in @buf.
2642 * n > 0: num_hwqs = n
2643 * n = 0: num_hwqs = num_online_cpus()
2644 * n < 0: num_online_cpus() / abs(n)
2646 * Return: The size of the ASCII string returned in @buf.
2648 static ssize_t
num_hwqs_store(struct device
*dev
,
2649 struct device_attribute
*attr
,
2650 const char *buf
, size_t count
)
2652 struct cxlflash_cfg
*cfg
= shost_priv(class_to_shost(dev
));
2653 struct afu
*afu
= cfg
->afu
;
2655 int nhwqs
, num_hwqs
;
2657 rc
= kstrtoint(buf
, 10, &nhwqs
);
2663 else if (nhwqs
== 0)
2664 num_hwqs
= num_online_cpus();
2666 num_hwqs
= num_online_cpus() / abs(nhwqs
);
2668 afu
->desired_hwqs
= min(num_hwqs
, CXLFLASH_MAX_HWQS
);
2669 WARN_ON_ONCE(afu
->desired_hwqs
== 0);
2672 switch (cfg
->state
) {
2674 cfg
->state
= STATE_RESET
;
2676 cxlflash_mark_contexts_error(cfg
);
2677 rc
= afu_reset(cfg
);
2679 cfg
->state
= STATE_FAILTERM
;
2681 cfg
->state
= STATE_NORMAL
;
2682 wake_up_all(&cfg
->reset_waitq
);
2685 wait_event(cfg
->reset_waitq
, cfg
->state
!= STATE_RESET
);
2686 if (cfg
->state
== STATE_NORMAL
)
2689 /* Ideally should not happen */
2690 dev_err(dev
, "%s: Device is not ready, state=%d\n",
2691 __func__
, cfg
->state
);
2698 static const char *hwq_mode_name
[MAX_HWQ_MODE
] = { "rr", "tag", "cpu" };
2701 * hwq_mode_show() - presents the HWQ steering mode for the host
2702 * @dev: Generic device associated with the host.
2703 * @attr: Device attribute representing the HWQ steering mode.
2704 * @buf: Buffer of length PAGE_SIZE to report back the HWQ steering mode
2705 * as a character string.
2707 * Return: The size of the ASCII string returned in @buf.
2709 static ssize_t
hwq_mode_show(struct device
*dev
,
2710 struct device_attribute
*attr
, char *buf
)
2712 struct cxlflash_cfg
*cfg
= shost_priv(class_to_shost(dev
));
2713 struct afu
*afu
= cfg
->afu
;
2715 return scnprintf(buf
, PAGE_SIZE
, "%s\n", hwq_mode_name
[afu
->hwq_mode
]);
2719 * hwq_mode_store() - sets the HWQ steering mode for the host
2720 * @dev: Generic device associated with the host.
2721 * @attr: Device attribute representing the HWQ steering mode.
2722 * @buf: Buffer of length PAGE_SIZE containing the HWQ steering mode
2723 * as a character string.
2724 * @count: Length of data resizing in @buf.
2727 * tag = Block MQ Tagging
2728 * cpu = CPU Affinity
2730 * Return: The size of the ASCII string returned in @buf.
2732 static ssize_t
hwq_mode_store(struct device
*dev
,
2733 struct device_attribute
*attr
,
2734 const char *buf
, size_t count
)
2736 struct Scsi_Host
*shost
= class_to_shost(dev
);
2737 struct cxlflash_cfg
*cfg
= shost_priv(shost
);
2738 struct device
*cfgdev
= &cfg
->dev
->dev
;
2739 struct afu
*afu
= cfg
->afu
;
2741 u32 mode
= MAX_HWQ_MODE
;
2743 for (i
= 0; i
< MAX_HWQ_MODE
; i
++) {
2744 if (!strncmp(hwq_mode_name
[i
], buf
, strlen(hwq_mode_name
[i
]))) {
2750 if (mode
>= MAX_HWQ_MODE
) {
2751 dev_info(cfgdev
, "Invalid HWQ steering mode.\n");
2755 if ((mode
== HWQ_MODE_TAG
) && !shost_use_blk_mq(shost
)) {
2756 dev_info(cfgdev
, "SCSI-MQ is not enabled, use a different "
2757 "HWQ steering mode.\n");
2761 afu
->hwq_mode
= mode
;
2767 * mode_show() - presents the current mode of the device
2768 * @dev: Generic device associated with the device.
2769 * @attr: Device attribute representing the device mode.
2770 * @buf: Buffer of length PAGE_SIZE to report back the dev mode in ASCII.
2772 * Return: The size of the ASCII string returned in @buf.
2774 static ssize_t
mode_show(struct device
*dev
,
2775 struct device_attribute
*attr
, char *buf
)
2777 struct scsi_device
*sdev
= to_scsi_device(dev
);
2779 return scnprintf(buf
, PAGE_SIZE
, "%s\n",
2780 sdev
->hostdata
? "superpipe" : "legacy");
2786 static DEVICE_ATTR_RO(port0
);
2787 static DEVICE_ATTR_RO(port1
);
2788 static DEVICE_ATTR_RO(port2
);
2789 static DEVICE_ATTR_RO(port3
);
2790 static DEVICE_ATTR_RW(lun_mode
);
2791 static DEVICE_ATTR_RO(ioctl_version
);
2792 static DEVICE_ATTR_RO(port0_lun_table
);
2793 static DEVICE_ATTR_RO(port1_lun_table
);
2794 static DEVICE_ATTR_RO(port2_lun_table
);
2795 static DEVICE_ATTR_RO(port3_lun_table
);
2796 static DEVICE_ATTR_RW(irqpoll_weight
);
2797 static DEVICE_ATTR_RW(num_hwqs
);
2798 static DEVICE_ATTR_RW(hwq_mode
);
2800 static struct device_attribute
*cxlflash_host_attrs
[] = {
2806 &dev_attr_ioctl_version
,
2807 &dev_attr_port0_lun_table
,
2808 &dev_attr_port1_lun_table
,
2809 &dev_attr_port2_lun_table
,
2810 &dev_attr_port3_lun_table
,
2811 &dev_attr_irqpoll_weight
,
2820 static DEVICE_ATTR_RO(mode
);
2822 static struct device_attribute
*cxlflash_dev_attrs
[] = {
2830 static struct scsi_host_template driver_template
= {
2831 .module
= THIS_MODULE
,
2832 .name
= CXLFLASH_ADAPTER_NAME
,
2833 .info
= cxlflash_driver_info
,
2834 .ioctl
= cxlflash_ioctl
,
2835 .proc_name
= CXLFLASH_NAME
,
2836 .queuecommand
= cxlflash_queuecommand
,
2837 .eh_device_reset_handler
= cxlflash_eh_device_reset_handler
,
2838 .eh_host_reset_handler
= cxlflash_eh_host_reset_handler
,
2839 .change_queue_depth
= cxlflash_change_queue_depth
,
2840 .cmd_per_lun
= CXLFLASH_MAX_CMDS_PER_LUN
,
2841 .can_queue
= CXLFLASH_MAX_CMDS
,
2842 .cmd_size
= sizeof(struct afu_cmd
) + __alignof__(struct afu_cmd
) - 1,
2844 .sg_tablesize
= 1, /* No scatter gather support */
2845 .max_sectors
= CXLFLASH_MAX_SECTORS
,
2846 .use_clustering
= ENABLE_CLUSTERING
,
2847 .shost_attrs
= cxlflash_host_attrs
,
2848 .sdev_attrs
= cxlflash_dev_attrs
,
2852 * Device dependent values
2854 static struct dev_dependent_vals dev_corsa_vals
= { CXLFLASH_MAX_SECTORS
,
2856 static struct dev_dependent_vals dev_flash_gt_vals
= { CXLFLASH_MAX_SECTORS
,
2857 CXLFLASH_NOTIFY_SHUTDOWN
};
2858 static struct dev_dependent_vals dev_briard_vals
= { CXLFLASH_MAX_SECTORS
,
2859 CXLFLASH_NOTIFY_SHUTDOWN
};
2862 * PCI device binding table
2864 static struct pci_device_id cxlflash_pci_table
[] = {
2865 {PCI_VENDOR_ID_IBM
, PCI_DEVICE_ID_IBM_CORSA
,
2866 PCI_ANY_ID
, PCI_ANY_ID
, 0, 0, (kernel_ulong_t
)&dev_corsa_vals
},
2867 {PCI_VENDOR_ID_IBM
, PCI_DEVICE_ID_IBM_FLASH_GT
,
2868 PCI_ANY_ID
, PCI_ANY_ID
, 0, 0, (kernel_ulong_t
)&dev_flash_gt_vals
},
2869 {PCI_VENDOR_ID_IBM
, PCI_DEVICE_ID_IBM_BRIARD
,
2870 PCI_ANY_ID
, PCI_ANY_ID
, 0, 0, (kernel_ulong_t
)&dev_briard_vals
},
2874 MODULE_DEVICE_TABLE(pci
, cxlflash_pci_table
);
2877 * cxlflash_worker_thread() - work thread handler for the AFU
2878 * @work: Work structure contained within cxlflash associated with host.
2880 * Handles the following events:
2881 * - Link reset which cannot be performed on interrupt context due to
2882 * blocking up to a few seconds
2885 static void cxlflash_worker_thread(struct work_struct
*work
)
2887 struct cxlflash_cfg
*cfg
= container_of(work
, struct cxlflash_cfg
,
2889 struct afu
*afu
= cfg
->afu
;
2890 struct device
*dev
= &cfg
->dev
->dev
;
2891 __be64 __iomem
*fc_port_regs
;
2895 /* Avoid MMIO if the device has failed */
2897 if (cfg
->state
!= STATE_NORMAL
)
2900 spin_lock_irqsave(cfg
->host
->host_lock
, lock_flags
);
2902 if (cfg
->lr_state
== LINK_RESET_REQUIRED
) {
2903 port
= cfg
->lr_port
;
2905 dev_err(dev
, "%s: invalid port index %d\n",
2908 spin_unlock_irqrestore(cfg
->host
->host_lock
,
2911 /* The reset can block... */
2912 fc_port_regs
= get_fc_port_regs(cfg
, port
);
2913 afu_link_reset(afu
, port
, fc_port_regs
);
2914 spin_lock_irqsave(cfg
->host
->host_lock
, lock_flags
);
2917 cfg
->lr_state
= LINK_RESET_COMPLETE
;
2920 spin_unlock_irqrestore(cfg
->host
->host_lock
, lock_flags
);
2922 if (atomic_dec_if_positive(&cfg
->scan_host_needed
) >= 0)
2923 scsi_scan_host(cfg
->host
);
2927 * cxlflash_probe() - PCI entry point to add host
2928 * @pdev: PCI device associated with the host.
2929 * @dev_id: PCI device id associated with device.
2931 * The device will initially start out in a 'probing' state and
2932 * transition to the 'normal' state at the end of a successful
2933 * probe. Should an EEH event occur during probe, the notification
2934 * thread (error_detected()) will wait until the probe handler
2935 * is nearly complete. At that time, the device will be moved to
2936 * a 'probed' state and the EEH thread woken up to drive the slot
2937 * reset and recovery (device moves to 'normal' state). Meanwhile,
2938 * the probe will be allowed to exit successfully.
2940 * Return: 0 on success, -errno on failure
2942 static int cxlflash_probe(struct pci_dev
*pdev
,
2943 const struct pci_device_id
*dev_id
)
2945 struct Scsi_Host
*host
;
2946 struct cxlflash_cfg
*cfg
= NULL
;
2947 struct device
*dev
= &pdev
->dev
;
2948 struct dev_dependent_vals
*ddv
;
2952 dev_dbg(&pdev
->dev
, "%s: Found CXLFLASH with IRQ: %d\n",
2953 __func__
, pdev
->irq
);
2955 ddv
= (struct dev_dependent_vals
*)dev_id
->driver_data
;
2956 driver_template
.max_sectors
= ddv
->max_sectors
;
2958 host
= scsi_host_alloc(&driver_template
, sizeof(struct cxlflash_cfg
));
2960 dev_err(dev
, "%s: scsi_host_alloc failed\n", __func__
);
2965 host
->max_id
= CXLFLASH_MAX_NUM_TARGETS_PER_BUS
;
2966 host
->max_lun
= CXLFLASH_MAX_NUM_LUNS_PER_TARGET
;
2967 host
->unique_id
= host
->host_no
;
2968 host
->max_cmd_len
= CXLFLASH_MAX_CDB_LEN
;
2970 cfg
= shost_priv(host
);
2972 rc
= alloc_mem(cfg
);
2974 dev_err(dev
, "%s: alloc_mem failed\n", __func__
);
2976 scsi_host_put(cfg
->host
);
2980 cfg
->init_state
= INIT_STATE_NONE
;
2982 cfg
->cxl_fops
= cxlflash_cxl_fops
;
2985 * Promoted LUNs move to the top of the LUN table. The rest stay on
2986 * the bottom half. The bottom half grows from the end (index = 255),
2987 * whereas the top half grows from the beginning (index = 0).
2989 * Initialize the last LUN index for all possible ports.
2991 cfg
->promote_lun_index
= 0;
2993 for (k
= 0; k
< MAX_FC_PORTS
; k
++)
2994 cfg
->last_lun_index
[k
] = CXLFLASH_NUM_VLUNS
/2 - 1;
2996 cfg
->dev_id
= (struct pci_device_id
*)dev_id
;
2998 init_waitqueue_head(&cfg
->tmf_waitq
);
2999 init_waitqueue_head(&cfg
->reset_waitq
);
3001 INIT_WORK(&cfg
->work_q
, cxlflash_worker_thread
);
3002 cfg
->lr_state
= LINK_RESET_INVALID
;
3004 spin_lock_init(&cfg
->tmf_slock
);
3005 mutex_init(&cfg
->ctx_tbl_list_mutex
);
3006 mutex_init(&cfg
->ctx_recovery_mutex
);
3007 init_rwsem(&cfg
->ioctl_rwsem
);
3008 INIT_LIST_HEAD(&cfg
->ctx_err_recovery
);
3009 INIT_LIST_HEAD(&cfg
->lluns
);
3011 pci_set_drvdata(pdev
, cfg
);
3013 cfg
->cxl_afu
= cxl_pci_to_afu(pdev
);
3017 dev_err(dev
, "%s: init_pci failed rc=%d\n", __func__
, rc
);
3020 cfg
->init_state
= INIT_STATE_PCI
;
3023 if (rc
&& !wq_has_sleeper(&cfg
->reset_waitq
)) {
3024 dev_err(dev
, "%s: init_afu failed rc=%d\n", __func__
, rc
);
3027 cfg
->init_state
= INIT_STATE_AFU
;
3029 rc
= init_scsi(cfg
);
3031 dev_err(dev
, "%s: init_scsi failed rc=%d\n", __func__
, rc
);
3034 cfg
->init_state
= INIT_STATE_SCSI
;
3036 if (wq_has_sleeper(&cfg
->reset_waitq
)) {
3037 cfg
->state
= STATE_PROBED
;
3038 wake_up_all(&cfg
->reset_waitq
);
3040 cfg
->state
= STATE_NORMAL
;
3042 dev_dbg(dev
, "%s: returning rc=%d\n", __func__
, rc
);
3046 cxlflash_remove(pdev
);
3051 * cxlflash_pci_error_detected() - called when a PCI error is detected
3052 * @pdev: PCI device struct.
3053 * @state: PCI channel state.
3055 * When an EEH occurs during an active reset, wait until the reset is
3056 * complete and then take action based upon the device state.
3058 * Return: PCI_ERS_RESULT_NEED_RESET or PCI_ERS_RESULT_DISCONNECT
3060 static pci_ers_result_t
cxlflash_pci_error_detected(struct pci_dev
*pdev
,
3061 pci_channel_state_t state
)
3064 struct cxlflash_cfg
*cfg
= pci_get_drvdata(pdev
);
3065 struct device
*dev
= &cfg
->dev
->dev
;
3067 dev_dbg(dev
, "%s: pdev=%p state=%u\n", __func__
, pdev
, state
);
3070 case pci_channel_io_frozen
:
3071 wait_event(cfg
->reset_waitq
, cfg
->state
!= STATE_RESET
&&
3072 cfg
->state
!= STATE_PROBING
);
3073 if (cfg
->state
== STATE_FAILTERM
)
3074 return PCI_ERS_RESULT_DISCONNECT
;
3076 cfg
->state
= STATE_RESET
;
3077 scsi_block_requests(cfg
->host
);
3079 rc
= cxlflash_mark_contexts_error(cfg
);
3081 dev_err(dev
, "%s: Failed to mark user contexts rc=%d\n",
3084 return PCI_ERS_RESULT_NEED_RESET
;
3085 case pci_channel_io_perm_failure
:
3086 cfg
->state
= STATE_FAILTERM
;
3087 wake_up_all(&cfg
->reset_waitq
);
3088 scsi_unblock_requests(cfg
->host
);
3089 return PCI_ERS_RESULT_DISCONNECT
;
3093 return PCI_ERS_RESULT_NEED_RESET
;
3097 * cxlflash_pci_slot_reset() - called when PCI slot has been reset
3098 * @pdev: PCI device struct.
3100 * This routine is called by the pci error recovery code after the PCI
3101 * slot has been reset, just before we should resume normal operations.
3103 * Return: PCI_ERS_RESULT_RECOVERED or PCI_ERS_RESULT_DISCONNECT
3105 static pci_ers_result_t
cxlflash_pci_slot_reset(struct pci_dev
*pdev
)
3108 struct cxlflash_cfg
*cfg
= pci_get_drvdata(pdev
);
3109 struct device
*dev
= &cfg
->dev
->dev
;
3111 dev_dbg(dev
, "%s: pdev=%p\n", __func__
, pdev
);
3115 dev_err(dev
, "%s: EEH recovery failed rc=%d\n", __func__
, rc
);
3116 return PCI_ERS_RESULT_DISCONNECT
;
3119 return PCI_ERS_RESULT_RECOVERED
;
3123 * cxlflash_pci_resume() - called when normal operation can resume
3124 * @pdev: PCI device struct
3126 static void cxlflash_pci_resume(struct pci_dev
*pdev
)
3128 struct cxlflash_cfg
*cfg
= pci_get_drvdata(pdev
);
3129 struct device
*dev
= &cfg
->dev
->dev
;
3131 dev_dbg(dev
, "%s: pdev=%p\n", __func__
, pdev
);
3133 cfg
->state
= STATE_NORMAL
;
3134 wake_up_all(&cfg
->reset_waitq
);
3135 scsi_unblock_requests(cfg
->host
);
3138 static const struct pci_error_handlers cxlflash_err_handler
= {
3139 .error_detected
= cxlflash_pci_error_detected
,
3140 .slot_reset
= cxlflash_pci_slot_reset
,
3141 .resume
= cxlflash_pci_resume
,
3145 * PCI device structure
3147 static struct pci_driver cxlflash_driver
= {
3148 .name
= CXLFLASH_NAME
,
3149 .id_table
= cxlflash_pci_table
,
3150 .probe
= cxlflash_probe
,
3151 .remove
= cxlflash_remove
,
3152 .shutdown
= cxlflash_remove
,
3153 .err_handler
= &cxlflash_err_handler
,
3157 * init_cxlflash() - module entry point
3159 * Return: 0 on success, -errno on failure
3161 static int __init
init_cxlflash(void)
3164 cxlflash_list_init();
3166 return pci_register_driver(&cxlflash_driver
);
3170 * exit_cxlflash() - module exit point
3172 static void __exit
exit_cxlflash(void)
3174 cxlflash_term_global_luns();
3175 cxlflash_free_errpage();
3177 pci_unregister_driver(&cxlflash_driver
);
3180 module_init(init_cxlflash
);
3181 module_exit(exit_cxlflash
);