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 sisl_ioarcb
*ioarcb
;
47 struct sisl_ioasa
*ioasa
;
56 if (ioasa
->rc
.flags
& SISL_RC_FLAGS_UNDERRUN
) {
58 scsi_set_resid(scp
, resid
);
59 pr_debug("%s: cmd underrun cmd = %p scp = %p, resid = %d\n",
60 __func__
, cmd
, scp
, resid
);
63 if (ioasa
->rc
.flags
& SISL_RC_FLAGS_OVERRUN
) {
64 pr_debug("%s: cmd underrun cmd = %p scp = %p\n",
66 scp
->result
= (DID_ERROR
<< 16);
69 pr_debug("%s: cmd failed afu_rc=%d scsi_rc=%d fc_rc=%d "
70 "afu_extra=0x%X, scsi_extra=0x%X, fc_extra=0x%X\n",
71 __func__
, ioasa
->rc
.afu_rc
, ioasa
->rc
.scsi_rc
,
72 ioasa
->rc
.fc_rc
, ioasa
->afu_extra
, ioasa
->scsi_extra
,
75 if (ioasa
->rc
.scsi_rc
) {
76 /* We have a SCSI status */
77 if (ioasa
->rc
.flags
& SISL_RC_FLAGS_SENSE_VALID
) {
78 memcpy(scp
->sense_buffer
, ioasa
->sense_data
,
80 scp
->result
= ioasa
->rc
.scsi_rc
;
82 scp
->result
= ioasa
->rc
.scsi_rc
| (DID_ERROR
<< 16);
86 * We encountered an error. Set scp->result based on nature
89 if (ioasa
->rc
.fc_rc
) {
90 /* We have an FC status */
91 switch (ioasa
->rc
.fc_rc
) {
92 case SISL_FC_RC_LINKDOWN
:
93 scp
->result
= (DID_REQUEUE
<< 16);
95 case SISL_FC_RC_RESID
:
96 /* This indicates an FCP resid underrun */
97 if (!(ioasa
->rc
.flags
& SISL_RC_FLAGS_OVERRUN
)) {
98 /* If the SISL_RC_FLAGS_OVERRUN flag was set,
99 * then we will handle this error else where.
100 * If not then we must handle it here.
101 * This is probably an AFU bug.
103 scp
->result
= (DID_ERROR
<< 16);
106 case SISL_FC_RC_RESIDERR
:
107 /* Resid mismatch between adapter and device */
108 case SISL_FC_RC_TGTABORT
:
109 case SISL_FC_RC_ABORTOK
:
110 case SISL_FC_RC_ABORTFAIL
:
111 case SISL_FC_RC_NOLOGI
:
112 case SISL_FC_RC_ABORTPEND
:
113 case SISL_FC_RC_WRABORTPEND
:
114 case SISL_FC_RC_NOEXP
:
115 case SISL_FC_RC_INUSE
:
116 scp
->result
= (DID_ERROR
<< 16);
121 if (ioasa
->rc
.afu_rc
) {
122 /* We have an AFU error */
123 switch (ioasa
->rc
.afu_rc
) {
124 case SISL_AFU_RC_NO_CHANNELS
:
125 scp
->result
= (DID_NO_CONNECT
<< 16);
127 case SISL_AFU_RC_DATA_DMA_ERR
:
128 switch (ioasa
->afu_extra
) {
129 case SISL_AFU_DMA_ERR_PAGE_IN
:
131 scp
->result
= (DID_IMM_RETRY
<< 16);
133 case SISL_AFU_DMA_ERR_INVALID_EA
:
135 scp
->result
= (DID_ERROR
<< 16);
138 case SISL_AFU_RC_OUT_OF_DATA_BUFS
:
140 scp
->result
= (DID_ALLOC_FAILURE
<< 16);
143 scp
->result
= (DID_ERROR
<< 16);
149 * cmd_complete() - command completion handler
150 * @cmd: AFU command that has completed.
152 * Prepares and submits command that has either completed or timed out to
153 * the SCSI stack. Checks AFU command back into command pool for non-internal
154 * (cmd->scp populated) commands.
156 static void cmd_complete(struct afu_cmd
*cmd
)
158 struct scsi_cmnd
*scp
;
160 struct afu
*afu
= cmd
->parent
;
161 struct cxlflash_cfg
*cfg
= afu
->parent
;
166 if (unlikely(cmd
->sa
.ioasc
))
167 process_cmd_err(cmd
, scp
);
169 scp
->result
= (DID_OK
<< 16);
171 cmd_is_tmf
= cmd
->cmd_tmf
;
173 pr_debug_ratelimited("%s: calling scsi_done scp=%p result=%X "
174 "ioasc=%d\n", __func__
, scp
, scp
->result
,
181 spin_lock_irqsave(&cfg
->tmf_slock
, lock_flags
);
182 cfg
->tmf_active
= false;
183 wake_up_all_locked(&cfg
->tmf_waitq
);
184 spin_unlock_irqrestore(&cfg
->tmf_slock
, lock_flags
);
187 complete(&cmd
->cevent
);
191 * context_reset() - reset command owner context via specified register
192 * @cmd: AFU command that timed out.
193 * @reset_reg: MMIO register to perform reset.
195 static void context_reset(struct afu_cmd
*cmd
, __be64 __iomem
*reset_reg
)
199 struct afu
*afu
= cmd
->parent
;
200 struct cxlflash_cfg
*cfg
= afu
->parent
;
201 struct device
*dev
= &cfg
->dev
->dev
;
203 pr_debug("%s: cmd=%p\n", __func__
, cmd
);
205 writeq_be(rrin
, reset_reg
);
207 rrin
= readq_be(reset_reg
);
210 /* Double delay each time */
212 } while (nretry
++ < MC_ROOM_RETRY_CNT
);
214 dev_dbg(dev
, "%s: returning rrin=0x%016llX nretry=%d\n",
215 __func__
, rrin
, nretry
);
219 * context_reset_ioarrin() - reset command owner context via IOARRIN register
220 * @cmd: AFU command that timed out.
222 static void context_reset_ioarrin(struct afu_cmd
*cmd
)
224 struct afu
*afu
= cmd
->parent
;
226 context_reset(cmd
, &afu
->host_map
->ioarrin
);
230 * send_cmd_ioarrin() - sends an AFU command via IOARRIN register
231 * @afu: AFU associated with the host.
232 * @cmd: AFU command to send.
235 * 0 on success, SCSI_MLQUEUE_HOST_BUSY on failure
237 static int send_cmd_ioarrin(struct afu
*afu
, struct afu_cmd
*cmd
)
239 struct cxlflash_cfg
*cfg
= afu
->parent
;
240 struct device
*dev
= &cfg
->dev
->dev
;
246 * To avoid the performance penalty of MMIO, spread the update of
247 * 'room' over multiple commands.
249 spin_lock_irqsave(&afu
->rrin_slock
, lock_flags
);
250 if (--afu
->room
< 0) {
251 room
= readq_be(&afu
->host_map
->cmd_room
);
253 dev_dbg_ratelimited(dev
, "%s: no cmd_room to send "
254 "0x%02X, room=0x%016llX\n",
255 __func__
, cmd
->rcb
.cdb
[0], room
);
257 rc
= SCSI_MLQUEUE_HOST_BUSY
;
260 afu
->room
= room
- 1;
263 writeq_be((u64
)&cmd
->rcb
, &afu
->host_map
->ioarrin
);
265 spin_unlock_irqrestore(&afu
->rrin_slock
, lock_flags
);
266 pr_devel("%s: cmd=%p len=%d ea=%p rc=%d\n", __func__
, cmd
,
267 cmd
->rcb
.data_len
, (void *)cmd
->rcb
.data_ea
, rc
);
272 * wait_resp() - polls for a response or timeout to a sent AFU command
273 * @afu: AFU associated with the host.
274 * @cmd: AFU command that was sent.
277 * 0 on success, -1 on timeout/error
279 static int wait_resp(struct afu
*afu
, struct afu_cmd
*cmd
)
282 ulong timeout
= msecs_to_jiffies(cmd
->rcb
.timeout
* 2 * 1000);
284 timeout
= wait_for_completion_timeout(&cmd
->cevent
, timeout
);
286 afu
->context_reset(cmd
);
290 if (unlikely(cmd
->sa
.ioasc
!= 0)) {
291 pr_err("%s: CMD 0x%X failed, IOASC: flags 0x%X, afu_rc 0x%X, "
292 "scsi_rc 0x%X, fc_rc 0x%X\n", __func__
, cmd
->rcb
.cdb
[0],
293 cmd
->sa
.rc
.flags
, cmd
->sa
.rc
.afu_rc
, cmd
->sa
.rc
.scsi_rc
,
302 * send_tmf() - sends a Task Management Function (TMF)
303 * @afu: AFU to checkout from.
304 * @scp: SCSI command from stack.
305 * @tmfcmd: TMF command to send.
308 * 0 on success, SCSI_MLQUEUE_HOST_BUSY on failure
310 static int send_tmf(struct afu
*afu
, struct scsi_cmnd
*scp
, u64 tmfcmd
)
312 u32 port_sel
= scp
->device
->channel
+ 1;
313 struct Scsi_Host
*host
= scp
->device
->host
;
314 struct cxlflash_cfg
*cfg
= (struct cxlflash_cfg
*)host
->hostdata
;
315 struct afu_cmd
*cmd
= sc_to_afucz(scp
);
316 struct device
*dev
= &cfg
->dev
->dev
;
321 /* When Task Management Function is active do not send another */
322 spin_lock_irqsave(&cfg
->tmf_slock
, lock_flags
);
324 wait_event_interruptible_lock_irq(cfg
->tmf_waitq
,
327 cfg
->tmf_active
= true;
328 spin_unlock_irqrestore(&cfg
->tmf_slock
, lock_flags
);
334 cmd
->rcb
.ctx_id
= afu
->ctx_hndl
;
335 cmd
->rcb
.msi
= SISL_MSI_RRQ_UPDATED
;
336 cmd
->rcb
.port_sel
= port_sel
;
337 cmd
->rcb
.lun_id
= lun_to_lunid(scp
->device
->lun
);
338 cmd
->rcb
.req_flags
= (SISL_REQ_FLAGS_PORT_LUN_ID
|
339 SISL_REQ_FLAGS_SUP_UNDERRUN
|
340 SISL_REQ_FLAGS_TMF_CMD
);
341 memcpy(cmd
->rcb
.cdb
, &tmfcmd
, sizeof(tmfcmd
));
343 rc
= afu
->send_cmd(afu
, cmd
);
345 spin_lock_irqsave(&cfg
->tmf_slock
, lock_flags
);
346 cfg
->tmf_active
= false;
347 spin_unlock_irqrestore(&cfg
->tmf_slock
, lock_flags
);
351 spin_lock_irqsave(&cfg
->tmf_slock
, lock_flags
);
352 to
= msecs_to_jiffies(5000);
353 to
= wait_event_interruptible_lock_irq_timeout(cfg
->tmf_waitq
,
358 cfg
->tmf_active
= false;
359 dev_err(dev
, "%s: TMF timed out!\n", __func__
);
362 spin_unlock_irqrestore(&cfg
->tmf_slock
, lock_flags
);
367 static void afu_unmap(struct kref
*ref
)
369 struct afu
*afu
= container_of(ref
, struct afu
, mapcount
);
371 if (likely(afu
->afu_map
)) {
372 cxl_psa_unmap((void __iomem
*)afu
->afu_map
);
378 * cxlflash_driver_info() - information handler for this host driver
379 * @host: SCSI host associated with device.
381 * Return: A string describing the device.
383 static const char *cxlflash_driver_info(struct Scsi_Host
*host
)
385 return CXLFLASH_ADAPTER_NAME
;
389 * cxlflash_queuecommand() - sends a mid-layer request
390 * @host: SCSI host associated with device.
391 * @scp: SCSI command to send.
393 * Return: 0 on success, SCSI_MLQUEUE_HOST_BUSY on failure
395 static int cxlflash_queuecommand(struct Scsi_Host
*host
, struct scsi_cmnd
*scp
)
397 struct cxlflash_cfg
*cfg
= (struct cxlflash_cfg
*)host
->hostdata
;
398 struct afu
*afu
= cfg
->afu
;
399 struct device
*dev
= &cfg
->dev
->dev
;
400 struct afu_cmd
*cmd
= sc_to_afucz(scp
);
401 struct scatterlist
*sg
= scsi_sglist(scp
);
402 u32 port_sel
= scp
->device
->channel
+ 1;
403 u16 req_flags
= SISL_REQ_FLAGS_SUP_UNDERRUN
;
409 dev_dbg_ratelimited(dev
, "%s: (scp=%p) %d/%d/%d/%llu "
410 "cdb=(%08X-%08X-%08X-%08X)\n",
411 __func__
, scp
, host
->host_no
, scp
->device
->channel
,
412 scp
->device
->id
, scp
->device
->lun
,
413 get_unaligned_be32(&((u32
*)scp
->cmnd
)[0]),
414 get_unaligned_be32(&((u32
*)scp
->cmnd
)[1]),
415 get_unaligned_be32(&((u32
*)scp
->cmnd
)[2]),
416 get_unaligned_be32(&((u32
*)scp
->cmnd
)[3]));
419 * If a Task Management Function is active, wait for it to complete
420 * before continuing with regular commands.
422 spin_lock_irqsave(&cfg
->tmf_slock
, lock_flags
);
423 if (cfg
->tmf_active
) {
424 spin_unlock_irqrestore(&cfg
->tmf_slock
, lock_flags
);
425 rc
= SCSI_MLQUEUE_HOST_BUSY
;
428 spin_unlock_irqrestore(&cfg
->tmf_slock
, lock_flags
);
430 switch (cfg
->state
) {
432 dev_dbg_ratelimited(dev
, "%s: device is in reset!\n", __func__
);
433 rc
= SCSI_MLQUEUE_HOST_BUSY
;
436 dev_dbg_ratelimited(dev
, "%s: device has failed!\n", __func__
);
437 scp
->result
= (DID_NO_CONNECT
<< 16);
445 kref_get(&cfg
->afu
->mapcount
);
449 nseg
= scsi_dma_map(scp
);
450 if (unlikely(nseg
< 0)) {
451 dev_err(dev
, "%s: Fail DMA map!\n", __func__
);
452 rc
= SCSI_MLQUEUE_HOST_BUSY
;
456 cmd
->rcb
.data_len
= sg_dma_len(sg
);
457 cmd
->rcb
.data_ea
= sg_dma_address(sg
);
463 cmd
->rcb
.ctx_id
= afu
->ctx_hndl
;
464 cmd
->rcb
.msi
= SISL_MSI_RRQ_UPDATED
;
465 cmd
->rcb
.port_sel
= port_sel
;
466 cmd
->rcb
.lun_id
= lun_to_lunid(scp
->device
->lun
);
468 if (scp
->sc_data_direction
== DMA_TO_DEVICE
)
469 req_flags
|= SISL_REQ_FLAGS_HOST_WRITE
;
471 cmd
->rcb
.req_flags
= req_flags
;
472 memcpy(cmd
->rcb
.cdb
, scp
->cmnd
, sizeof(cmd
->rcb
.cdb
));
474 rc
= afu
->send_cmd(afu
, cmd
);
479 kref_put(&afu
->mapcount
, afu_unmap
);
480 pr_devel("%s: returning rc=%d\n", __func__
, rc
);
485 * cxlflash_wait_for_pci_err_recovery() - wait for error recovery during probe
486 * @cfg: Internal structure associated with the host.
488 static void cxlflash_wait_for_pci_err_recovery(struct cxlflash_cfg
*cfg
)
490 struct pci_dev
*pdev
= cfg
->dev
;
492 if (pci_channel_offline(pdev
))
493 wait_event_timeout(cfg
->reset_waitq
,
494 !pci_channel_offline(pdev
),
495 CXLFLASH_PCI_ERROR_RECOVERY_TIMEOUT
);
499 * free_mem() - free memory associated with the AFU
500 * @cfg: Internal structure associated with the host.
502 static void free_mem(struct cxlflash_cfg
*cfg
)
504 struct afu
*afu
= cfg
->afu
;
507 free_pages((ulong
)afu
, get_order(sizeof(struct afu
)));
513 * stop_afu() - stops the AFU command timers and unmaps the MMIO space
514 * @cfg: Internal structure associated with the host.
516 * Safe to call with AFU in a partially allocated/initialized state.
518 * Waits for any active internal AFU commands to timeout and then unmaps
521 static void stop_afu(struct cxlflash_cfg
*cfg
)
523 struct afu
*afu
= cfg
->afu
;
526 while (atomic_read(&afu
->cmds_active
))
528 if (likely(afu
->afu_map
)) {
529 cxl_psa_unmap((void __iomem
*)afu
->afu_map
);
532 kref_put(&afu
->mapcount
, afu_unmap
);
537 * term_intr() - disables all AFU interrupts
538 * @cfg: Internal structure associated with the host.
539 * @level: Depth of allocation, where to begin waterfall tear down.
541 * Safe to call with AFU/MC in partially allocated/initialized state.
543 static void term_intr(struct cxlflash_cfg
*cfg
, enum undo_level level
)
545 struct afu
*afu
= cfg
->afu
;
546 struct device
*dev
= &cfg
->dev
->dev
;
548 if (!afu
|| !cfg
->mcctx
) {
549 dev_err(dev
, "%s: returning with NULL afu or MC\n", __func__
);
555 cxl_unmap_afu_irq(cfg
->mcctx
, 3, afu
);
557 cxl_unmap_afu_irq(cfg
->mcctx
, 2, afu
);
559 cxl_unmap_afu_irq(cfg
->mcctx
, 1, afu
);
561 cxl_free_afu_irqs(cfg
->mcctx
);
564 /* No action required */
570 * term_mc() - terminates the master context
571 * @cfg: Internal structure associated with the host.
572 * @level: Depth of allocation, where to begin waterfall tear down.
574 * Safe to call with AFU/MC in partially allocated/initialized state.
576 static void term_mc(struct cxlflash_cfg
*cfg
)
579 struct afu
*afu
= cfg
->afu
;
580 struct device
*dev
= &cfg
->dev
->dev
;
582 if (!afu
|| !cfg
->mcctx
) {
583 dev_err(dev
, "%s: returning with NULL afu or MC\n", __func__
);
587 rc
= cxl_stop_context(cfg
->mcctx
);
593 * term_afu() - terminates the AFU
594 * @cfg: Internal structure associated with the host.
596 * Safe to call with AFU/MC in partially allocated/initialized state.
598 static void term_afu(struct cxlflash_cfg
*cfg
)
601 * Tear down is carefully orchestrated to ensure
602 * no interrupts can come in when the problem state
605 * 1) Disable all AFU interrupts
606 * 2) Unmap the problem state area
607 * 3) Stop the master context
609 term_intr(cfg
, UNMAP_THREE
);
615 pr_debug("%s: returning\n", __func__
);
619 * notify_shutdown() - notifies device of pending shutdown
620 * @cfg: Internal structure associated with the host.
621 * @wait: Whether to wait for shutdown processing to complete.
623 * This function will notify the AFU that the adapter is being shutdown
624 * and will wait for shutdown processing to complete if wait is true.
625 * This notification should flush pending I/Os to the device and halt
626 * further I/Os until the next AFU reset is issued and device restarted.
628 static void notify_shutdown(struct cxlflash_cfg
*cfg
, bool wait
)
630 struct afu
*afu
= cfg
->afu
;
631 struct device
*dev
= &cfg
->dev
->dev
;
632 struct sisl_global_map __iomem
*global
;
633 struct dev_dependent_vals
*ddv
;
635 int i
, retry_cnt
= 0;
637 ddv
= (struct dev_dependent_vals
*)cfg
->dev_id
->driver_data
;
638 if (!(ddv
->flags
& CXLFLASH_NOTIFY_SHUTDOWN
))
641 if (!afu
|| !afu
->afu_map
) {
642 dev_dbg(dev
, "%s: The problem state area is not mapped\n",
647 global
= &afu
->afu_map
->global
;
650 for (i
= 0; i
< NUM_FC_PORTS
; i
++) {
651 reg
= readq_be(&global
->fc_regs
[i
][FC_CONFIG2
/ 8]);
652 reg
|= SISL_FC_SHUTDOWN_NORMAL
;
653 writeq_be(reg
, &global
->fc_regs
[i
][FC_CONFIG2
/ 8]);
659 /* Wait up to 1.5 seconds for shutdown processing to complete */
660 for (i
= 0; i
< NUM_FC_PORTS
; i
++) {
663 status
= readq_be(&global
->fc_regs
[i
][FC_STATUS
/ 8]);
664 if (status
& SISL_STATUS_SHUTDOWN_COMPLETE
)
666 if (++retry_cnt
>= MC_RETRY_CNT
) {
667 dev_dbg(dev
, "%s: port %d shutdown processing "
668 "not yet completed\n", __func__
, i
);
671 msleep(100 * retry_cnt
);
677 * cxlflash_remove() - PCI entry point to tear down host
678 * @pdev: PCI device associated with the host.
680 * Safe to use as a cleanup in partially allocated/initialized state.
682 static void cxlflash_remove(struct pci_dev
*pdev
)
684 struct cxlflash_cfg
*cfg
= pci_get_drvdata(pdev
);
687 if (!pci_is_enabled(pdev
)) {
688 pr_debug("%s: Device is disabled\n", __func__
);
692 /* If a Task Management Function is active, wait for it to complete
693 * before continuing with remove.
695 spin_lock_irqsave(&cfg
->tmf_slock
, lock_flags
);
697 wait_event_interruptible_lock_irq(cfg
->tmf_waitq
,
700 spin_unlock_irqrestore(&cfg
->tmf_slock
, lock_flags
);
702 /* Notify AFU and wait for shutdown processing to complete */
703 notify_shutdown(cfg
, true);
705 cfg
->state
= STATE_FAILTERM
;
706 cxlflash_stop_term_user_contexts(cfg
);
708 switch (cfg
->init_state
) {
709 case INIT_STATE_SCSI
:
710 cxlflash_term_local_luns(cfg
);
711 scsi_remove_host(cfg
->host
);
714 cancel_work_sync(&cfg
->work_q
);
717 pci_disable_device(pdev
);
718 case INIT_STATE_NONE
:
720 scsi_host_put(cfg
->host
);
724 pr_debug("%s: returning\n", __func__
);
728 * alloc_mem() - allocates the AFU and its command pool
729 * @cfg: Internal structure associated with the host.
731 * A partially allocated state remains on failure.
735 * -ENOMEM on failure to allocate memory
737 static int alloc_mem(struct cxlflash_cfg
*cfg
)
740 struct device
*dev
= &cfg
->dev
->dev
;
742 /* AFU is ~12k, i.e. only one 64k page or up to four 4k pages */
743 cfg
->afu
= (void *)__get_free_pages(GFP_KERNEL
| __GFP_ZERO
,
744 get_order(sizeof(struct afu
)));
745 if (unlikely(!cfg
->afu
)) {
746 dev_err(dev
, "%s: cannot get %d free pages\n",
747 __func__
, get_order(sizeof(struct afu
)));
751 cfg
->afu
->parent
= cfg
;
752 cfg
->afu
->afu_map
= NULL
;
758 * init_pci() - initializes the host as a PCI device
759 * @cfg: Internal structure associated with the host.
761 * Return: 0 on success, -errno on failure
763 static int init_pci(struct cxlflash_cfg
*cfg
)
765 struct pci_dev
*pdev
= cfg
->dev
;
768 rc
= pci_enable_device(pdev
);
769 if (rc
|| pci_channel_offline(pdev
)) {
770 if (pci_channel_offline(pdev
)) {
771 cxlflash_wait_for_pci_err_recovery(cfg
);
772 rc
= pci_enable_device(pdev
);
776 dev_err(&pdev
->dev
, "%s: Cannot enable adapter\n",
778 cxlflash_wait_for_pci_err_recovery(cfg
);
784 pr_debug("%s: returning rc=%d\n", __func__
, rc
);
789 * init_scsi() - adds the host to the SCSI stack and kicks off host scan
790 * @cfg: Internal structure associated with the host.
792 * Return: 0 on success, -errno on failure
794 static int init_scsi(struct cxlflash_cfg
*cfg
)
796 struct pci_dev
*pdev
= cfg
->dev
;
799 rc
= scsi_add_host(cfg
->host
, &pdev
->dev
);
801 dev_err(&pdev
->dev
, "%s: scsi_add_host failed (rc=%d)\n",
806 scsi_scan_host(cfg
->host
);
809 pr_debug("%s: returning rc=%d\n", __func__
, rc
);
814 * set_port_online() - transitions the specified host FC port to online state
815 * @fc_regs: Top of MMIO region defined for specified port.
817 * The provided MMIO region must be mapped prior to call. Online state means
818 * that the FC link layer has synced, completed the handshaking process, and
819 * is ready for login to start.
821 static void set_port_online(__be64 __iomem
*fc_regs
)
825 cmdcfg
= readq_be(&fc_regs
[FC_MTIP_CMDCONFIG
/ 8]);
826 cmdcfg
&= (~FC_MTIP_CMDCONFIG_OFFLINE
); /* clear OFF_LINE */
827 cmdcfg
|= (FC_MTIP_CMDCONFIG_ONLINE
); /* set ON_LINE */
828 writeq_be(cmdcfg
, &fc_regs
[FC_MTIP_CMDCONFIG
/ 8]);
832 * set_port_offline() - transitions the specified host FC port to offline state
833 * @fc_regs: Top of MMIO region defined for specified port.
835 * The provided MMIO region must be mapped prior to call.
837 static void set_port_offline(__be64 __iomem
*fc_regs
)
841 cmdcfg
= readq_be(&fc_regs
[FC_MTIP_CMDCONFIG
/ 8]);
842 cmdcfg
&= (~FC_MTIP_CMDCONFIG_ONLINE
); /* clear ON_LINE */
843 cmdcfg
|= (FC_MTIP_CMDCONFIG_OFFLINE
); /* set OFF_LINE */
844 writeq_be(cmdcfg
, &fc_regs
[FC_MTIP_CMDCONFIG
/ 8]);
848 * wait_port_online() - waits for the specified host FC port come online
849 * @fc_regs: Top of MMIO region defined for specified port.
850 * @delay_us: Number of microseconds to delay between reading port status.
851 * @nretry: Number of cycles to retry reading port status.
853 * The provided MMIO region must be mapped prior to call. This will timeout
854 * when the cable is not plugged in.
857 * TRUE (1) when the specified port is online
858 * FALSE (0) when the specified port fails to come online after timeout
859 * -EINVAL when @delay_us is less than 1000
861 static int wait_port_online(__be64 __iomem
*fc_regs
, u32 delay_us
, u32 nretry
)
865 if (delay_us
< 1000) {
866 pr_err("%s: invalid delay specified %d\n", __func__
, delay_us
);
871 msleep(delay_us
/ 1000);
872 status
= readq_be(&fc_regs
[FC_MTIP_STATUS
/ 8]);
873 if (status
== U64_MAX
)
875 } while ((status
& FC_MTIP_STATUS_MASK
) != FC_MTIP_STATUS_ONLINE
&&
878 return ((status
& FC_MTIP_STATUS_MASK
) == FC_MTIP_STATUS_ONLINE
);
882 * wait_port_offline() - waits for the specified host FC port go offline
883 * @fc_regs: Top of MMIO region defined for specified port.
884 * @delay_us: Number of microseconds to delay between reading port status.
885 * @nretry: Number of cycles to retry reading port status.
887 * The provided MMIO region must be mapped prior to call.
890 * TRUE (1) when the specified port is offline
891 * FALSE (0) when the specified port fails to go offline after timeout
892 * -EINVAL when @delay_us is less than 1000
894 static int wait_port_offline(__be64 __iomem
*fc_regs
, u32 delay_us
, u32 nretry
)
898 if (delay_us
< 1000) {
899 pr_err("%s: invalid delay specified %d\n", __func__
, delay_us
);
904 msleep(delay_us
/ 1000);
905 status
= readq_be(&fc_regs
[FC_MTIP_STATUS
/ 8]);
906 if (status
== U64_MAX
)
908 } while ((status
& FC_MTIP_STATUS_MASK
) != FC_MTIP_STATUS_OFFLINE
&&
911 return ((status
& FC_MTIP_STATUS_MASK
) == FC_MTIP_STATUS_OFFLINE
);
915 * afu_set_wwpn() - configures the WWPN for the specified host FC port
916 * @afu: AFU associated with the host that owns the specified FC port.
917 * @port: Port number being configured.
918 * @fc_regs: Top of MMIO region defined for specified port.
919 * @wwpn: The world-wide-port-number previously discovered for port.
921 * The provided MMIO region must be mapped prior to call. As part of the
922 * sequence to configure the WWPN, the port is toggled offline and then back
923 * online. This toggling action can cause this routine to delay up to a few
924 * seconds. When configured to use the internal LUN feature of the AFU, a
925 * failure to come online is overridden.
927 static void afu_set_wwpn(struct afu
*afu
, int port
, __be64 __iomem
*fc_regs
,
930 set_port_offline(fc_regs
);
931 if (!wait_port_offline(fc_regs
, FC_PORT_STATUS_RETRY_INTERVAL_US
,
932 FC_PORT_STATUS_RETRY_CNT
)) {
933 pr_debug("%s: wait on port %d to go offline timed out\n",
937 writeq_be(wwpn
, &fc_regs
[FC_PNAME
/ 8]);
939 set_port_online(fc_regs
);
940 if (!wait_port_online(fc_regs
, FC_PORT_STATUS_RETRY_INTERVAL_US
,
941 FC_PORT_STATUS_RETRY_CNT
)) {
942 pr_debug("%s: wait on port %d to go online timed out\n",
948 * afu_link_reset() - resets the specified host FC port
949 * @afu: AFU associated with the host that owns the specified FC port.
950 * @port: Port number being configured.
951 * @fc_regs: Top of MMIO region defined for specified port.
953 * The provided MMIO region must be mapped prior to call. The sequence to
954 * reset the port involves toggling it offline and then back online. This
955 * action can cause this routine to delay up to a few seconds. An effort
956 * is made to maintain link with the device by switching to host to use
957 * the alternate port exclusively while the reset takes place.
958 * failure to come online is overridden.
960 static void afu_link_reset(struct afu
*afu
, int port
, __be64 __iomem
*fc_regs
)
964 /* first switch the AFU to the other links, if any */
965 port_sel
= readq_be(&afu
->afu_map
->global
.regs
.afu_port_sel
);
966 port_sel
&= ~(1ULL << port
);
967 writeq_be(port_sel
, &afu
->afu_map
->global
.regs
.afu_port_sel
);
968 cxlflash_afu_sync(afu
, 0, 0, AFU_GSYNC
);
970 set_port_offline(fc_regs
);
971 if (!wait_port_offline(fc_regs
, FC_PORT_STATUS_RETRY_INTERVAL_US
,
972 FC_PORT_STATUS_RETRY_CNT
))
973 pr_err("%s: wait on port %d to go offline timed out\n",
976 set_port_online(fc_regs
);
977 if (!wait_port_online(fc_regs
, FC_PORT_STATUS_RETRY_INTERVAL_US
,
978 FC_PORT_STATUS_RETRY_CNT
))
979 pr_err("%s: wait on port %d to go online timed out\n",
982 /* switch back to include this port */
983 port_sel
|= (1ULL << port
);
984 writeq_be(port_sel
, &afu
->afu_map
->global
.regs
.afu_port_sel
);
985 cxlflash_afu_sync(afu
, 0, 0, AFU_GSYNC
);
987 pr_debug("%s: returning port_sel=%lld\n", __func__
, port_sel
);
991 * Asynchronous interrupt information table
993 static const struct asyc_intr_info ainfo
[] = {
994 {SISL_ASTATUS_FC0_OTHER
, "other error", 0, CLR_FC_ERROR
| LINK_RESET
},
995 {SISL_ASTATUS_FC0_LOGO
, "target initiated LOGO", 0, 0},
996 {SISL_ASTATUS_FC0_CRC_T
, "CRC threshold exceeded", 0, LINK_RESET
},
997 {SISL_ASTATUS_FC0_LOGI_R
, "login timed out, retrying", 0, LINK_RESET
},
998 {SISL_ASTATUS_FC0_LOGI_F
, "login failed", 0, CLR_FC_ERROR
},
999 {SISL_ASTATUS_FC0_LOGI_S
, "login succeeded", 0, SCAN_HOST
},
1000 {SISL_ASTATUS_FC0_LINK_DN
, "link down", 0, 0},
1001 {SISL_ASTATUS_FC0_LINK_UP
, "link up", 0, 0},
1002 {SISL_ASTATUS_FC1_OTHER
, "other error", 1, CLR_FC_ERROR
| LINK_RESET
},
1003 {SISL_ASTATUS_FC1_LOGO
, "target initiated LOGO", 1, 0},
1004 {SISL_ASTATUS_FC1_CRC_T
, "CRC threshold exceeded", 1, LINK_RESET
},
1005 {SISL_ASTATUS_FC1_LOGI_R
, "login timed out, retrying", 1, LINK_RESET
},
1006 {SISL_ASTATUS_FC1_LOGI_F
, "login failed", 1, CLR_FC_ERROR
},
1007 {SISL_ASTATUS_FC1_LOGI_S
, "login succeeded", 1, SCAN_HOST
},
1008 {SISL_ASTATUS_FC1_LINK_DN
, "link down", 1, 0},
1009 {SISL_ASTATUS_FC1_LINK_UP
, "link up", 1, 0},
1010 {0x0, "", 0, 0} /* terminator */
1014 * find_ainfo() - locates and returns asynchronous interrupt information
1015 * @status: Status code set by AFU on error.
1017 * Return: The located information or NULL when the status code is invalid.
1019 static const struct asyc_intr_info
*find_ainfo(u64 status
)
1021 const struct asyc_intr_info
*info
;
1023 for (info
= &ainfo
[0]; info
->status
; info
++)
1024 if (info
->status
== status
)
1031 * afu_err_intr_init() - clears and initializes the AFU for error interrupts
1032 * @afu: AFU associated with the host.
1034 static void afu_err_intr_init(struct afu
*afu
)
1039 /* global async interrupts: AFU clears afu_ctrl on context exit
1040 * if async interrupts were sent to that context. This prevents
1041 * the AFU form sending further async interrupts when
1043 * nobody to receive them.
1047 writeq_be(-1ULL, &afu
->afu_map
->global
.regs
.aintr_mask
);
1048 /* set LISN# to send and point to master context */
1049 reg
= ((u64
) (((afu
->ctx_hndl
<< 8) | SISL_MSI_ASYNC_ERROR
)) << 40);
1051 if (afu
->internal_lun
)
1052 reg
|= 1; /* Bit 63 indicates local lun */
1053 writeq_be(reg
, &afu
->afu_map
->global
.regs
.afu_ctrl
);
1055 writeq_be(-1ULL, &afu
->afu_map
->global
.regs
.aintr_clear
);
1056 /* unmask bits that are of interest */
1057 /* note: afu can send an interrupt after this step */
1058 writeq_be(SISL_ASTATUS_MASK
, &afu
->afu_map
->global
.regs
.aintr_mask
);
1059 /* clear again in case a bit came on after previous clear but before */
1061 writeq_be(-1ULL, &afu
->afu_map
->global
.regs
.aintr_clear
);
1063 /* Clear/Set internal lun bits */
1064 reg
= readq_be(&afu
->afu_map
->global
.fc_regs
[0][FC_CONFIG2
/ 8]);
1065 reg
&= SISL_FC_INTERNAL_MASK
;
1066 if (afu
->internal_lun
)
1067 reg
|= ((u64
)(afu
->internal_lun
- 1) << SISL_FC_INTERNAL_SHIFT
);
1068 writeq_be(reg
, &afu
->afu_map
->global
.fc_regs
[0][FC_CONFIG2
/ 8]);
1070 /* now clear FC errors */
1071 for (i
= 0; i
< NUM_FC_PORTS
; i
++) {
1072 writeq_be(0xFFFFFFFFU
,
1073 &afu
->afu_map
->global
.fc_regs
[i
][FC_ERROR
/ 8]);
1074 writeq_be(0, &afu
->afu_map
->global
.fc_regs
[i
][FC_ERRCAP
/ 8]);
1077 /* sync interrupts for master's IOARRIN write */
1078 /* note that unlike asyncs, there can be no pending sync interrupts */
1079 /* at this time (this is a fresh context and master has not written */
1080 /* IOARRIN yet), so there is nothing to clear. */
1082 /* set LISN#, it is always sent to the context that wrote IOARRIN */
1083 writeq_be(SISL_MSI_SYNC_ERROR
, &afu
->host_map
->ctx_ctrl
);
1084 writeq_be(SISL_ISTATUS_MASK
, &afu
->host_map
->intr_mask
);
1088 * cxlflash_sync_err_irq() - interrupt handler for synchronous errors
1089 * @irq: Interrupt number.
1090 * @data: Private data provided at interrupt registration, the AFU.
1092 * Return: Always return IRQ_HANDLED.
1094 static irqreturn_t
cxlflash_sync_err_irq(int irq
, void *data
)
1096 struct afu
*afu
= (struct afu
*)data
;
1100 reg
= readq_be(&afu
->host_map
->intr_status
);
1101 reg_unmasked
= (reg
& SISL_ISTATUS_UNMASK
);
1103 if (reg_unmasked
== 0UL) {
1104 pr_err("%s: %llX: spurious interrupt, intr_status %016llX\n",
1105 __func__
, (u64
)afu
, reg
);
1106 goto cxlflash_sync_err_irq_exit
;
1109 pr_err("%s: %llX: unexpected interrupt, intr_status %016llX\n",
1110 __func__
, (u64
)afu
, reg
);
1112 writeq_be(reg_unmasked
, &afu
->host_map
->intr_clear
);
1114 cxlflash_sync_err_irq_exit
:
1115 pr_debug("%s: returning rc=%d\n", __func__
, IRQ_HANDLED
);
1120 * cxlflash_rrq_irq() - interrupt handler for read-response queue (normal path)
1121 * @irq: Interrupt number.
1122 * @data: Private data provided at interrupt registration, the AFU.
1124 * Return: Always return IRQ_HANDLED.
1126 static irqreturn_t
cxlflash_rrq_irq(int irq
, void *data
)
1128 struct afu
*afu
= (struct afu
*)data
;
1129 struct afu_cmd
*cmd
;
1130 bool toggle
= afu
->toggle
;
1132 *hrrq_start
= afu
->hrrq_start
,
1133 *hrrq_end
= afu
->hrrq_end
,
1134 *hrrq_curr
= afu
->hrrq_curr
;
1136 /* Process however many RRQ entries that are ready */
1140 if ((entry
& SISL_RESP_HANDLE_T_BIT
) != toggle
)
1143 cmd
= (struct afu_cmd
*)(entry
& ~SISL_RESP_HANDLE_T_BIT
);
1146 /* Advance to next entry or wrap and flip the toggle bit */
1147 if (hrrq_curr
< hrrq_end
)
1150 hrrq_curr
= hrrq_start
;
1151 toggle
^= SISL_RESP_HANDLE_T_BIT
;
1155 afu
->hrrq_curr
= hrrq_curr
;
1156 afu
->toggle
= toggle
;
1162 * cxlflash_async_err_irq() - interrupt handler for asynchronous errors
1163 * @irq: Interrupt number.
1164 * @data: Private data provided at interrupt registration, the AFU.
1166 * Return: Always return IRQ_HANDLED.
1168 static irqreturn_t
cxlflash_async_err_irq(int irq
, void *data
)
1170 struct afu
*afu
= (struct afu
*)data
;
1171 struct cxlflash_cfg
*cfg
= afu
->parent
;
1172 struct device
*dev
= &cfg
->dev
->dev
;
1174 const struct asyc_intr_info
*info
;
1175 struct sisl_global_map __iomem
*global
= &afu
->afu_map
->global
;
1180 reg
= readq_be(&global
->regs
.aintr_status
);
1181 reg_unmasked
= (reg
& SISL_ASTATUS_UNMASK
);
1183 if (reg_unmasked
== 0) {
1184 dev_err(dev
, "%s: spurious interrupt, aintr_status 0x%016llX\n",
1189 /* FYI, it is 'okay' to clear AFU status before FC_ERROR */
1190 writeq_be(reg_unmasked
, &global
->regs
.aintr_clear
);
1192 /* Check each bit that is on */
1193 for (i
= 0; reg_unmasked
; i
++, reg_unmasked
= (reg_unmasked
>> 1)) {
1194 info
= find_ainfo(1ULL << i
);
1195 if (((reg_unmasked
& 0x1) == 0) || !info
)
1200 dev_err(dev
, "%s: FC Port %d -> %s, fc_status 0x%08llX\n",
1201 __func__
, port
, info
->desc
,
1202 readq_be(&global
->fc_regs
[port
][FC_STATUS
/ 8]));
1205 * Do link reset first, some OTHER errors will set FC_ERROR
1206 * again if cleared before or w/o a reset
1208 if (info
->action
& LINK_RESET
) {
1209 dev_err(dev
, "%s: FC Port %d: resetting link\n",
1211 cfg
->lr_state
= LINK_RESET_REQUIRED
;
1212 cfg
->lr_port
= port
;
1213 kref_get(&cfg
->afu
->mapcount
);
1214 schedule_work(&cfg
->work_q
);
1217 if (info
->action
& CLR_FC_ERROR
) {
1218 reg
= readq_be(&global
->fc_regs
[port
][FC_ERROR
/ 8]);
1221 * Since all errors are unmasked, FC_ERROR and FC_ERRCAP
1222 * should be the same and tracing one is sufficient.
1225 dev_err(dev
, "%s: fc %d: clearing fc_error 0x%08llX\n",
1226 __func__
, port
, reg
);
1228 writeq_be(reg
, &global
->fc_regs
[port
][FC_ERROR
/ 8]);
1229 writeq_be(0, &global
->fc_regs
[port
][FC_ERRCAP
/ 8]);
1232 if (info
->action
& SCAN_HOST
) {
1233 atomic_inc(&cfg
->scan_host_needed
);
1234 kref_get(&cfg
->afu
->mapcount
);
1235 schedule_work(&cfg
->work_q
);
1240 dev_dbg(dev
, "%s: returning IRQ_HANDLED, afu=%p\n", __func__
, afu
);
1245 * start_context() - starts the master context
1246 * @cfg: Internal structure associated with the host.
1248 * Return: A success or failure value from CXL services.
1250 static int start_context(struct cxlflash_cfg
*cfg
)
1254 rc
= cxl_start_context(cfg
->mcctx
,
1255 cfg
->afu
->work
.work_element_descriptor
,
1258 pr_debug("%s: returning rc=%d\n", __func__
, rc
);
1263 * read_vpd() - obtains the WWPNs from VPD
1264 * @cfg: Internal structure associated with the host.
1265 * @wwpn: Array of size NUM_FC_PORTS to pass back WWPNs
1267 * Return: 0 on success, -errno on failure
1269 static int read_vpd(struct cxlflash_cfg
*cfg
, u64 wwpn
[])
1271 struct pci_dev
*dev
= cfg
->dev
;
1273 int ro_start
, ro_size
, i
, j
, k
;
1275 char vpd_data
[CXLFLASH_VPD_LEN
];
1276 char tmp_buf
[WWPN_BUF_LEN
] = { 0 };
1277 char *wwpn_vpd_tags
[NUM_FC_PORTS
] = { "V5", "V6" };
1279 /* Get the VPD data from the device */
1280 vpd_size
= cxl_read_adapter_vpd(dev
, vpd_data
, sizeof(vpd_data
));
1281 if (unlikely(vpd_size
<= 0)) {
1282 dev_err(&dev
->dev
, "%s: Unable to read VPD (size = %ld)\n",
1283 __func__
, vpd_size
);
1288 /* Get the read only section offset */
1289 ro_start
= pci_vpd_find_tag(vpd_data
, 0, vpd_size
,
1290 PCI_VPD_LRDT_RO_DATA
);
1291 if (unlikely(ro_start
< 0)) {
1292 dev_err(&dev
->dev
, "%s: VPD Read-only data not found\n",
1298 /* Get the read only section size, cap when extends beyond read VPD */
1299 ro_size
= pci_vpd_lrdt_size(&vpd_data
[ro_start
]);
1301 i
= ro_start
+ PCI_VPD_LRDT_TAG_SIZE
;
1302 if (unlikely((i
+ j
) > vpd_size
)) {
1303 pr_debug("%s: Might need to read more VPD (%d > %ld)\n",
1304 __func__
, (i
+ j
), vpd_size
);
1305 ro_size
= vpd_size
- i
;
1309 * Find the offset of the WWPN tag within the read only
1310 * VPD data and validate the found field (partials are
1311 * no good to us). Convert the ASCII data to an integer
1312 * value. Note that we must copy to a temporary buffer
1313 * because the conversion service requires that the ASCII
1314 * string be terminated.
1316 for (k
= 0; k
< NUM_FC_PORTS
; k
++) {
1318 i
= ro_start
+ PCI_VPD_LRDT_TAG_SIZE
;
1320 i
= pci_vpd_find_info_keyword(vpd_data
, i
, j
, wwpn_vpd_tags
[k
]);
1321 if (unlikely(i
< 0)) {
1322 dev_err(&dev
->dev
, "%s: Port %d WWPN not found "
1323 "in VPD\n", __func__
, k
);
1328 j
= pci_vpd_info_field_size(&vpd_data
[i
]);
1329 i
+= PCI_VPD_INFO_FLD_HDR_SIZE
;
1330 if (unlikely((i
+ j
> vpd_size
) || (j
!= WWPN_LEN
))) {
1331 dev_err(&dev
->dev
, "%s: Port %d WWPN incomplete or "
1338 memcpy(tmp_buf
, &vpd_data
[i
], WWPN_LEN
);
1339 rc
= kstrtoul(tmp_buf
, WWPN_LEN
, (ulong
*)&wwpn
[k
]);
1341 dev_err(&dev
->dev
, "%s: Fail to convert port %d WWPN "
1342 "to integer\n", __func__
, k
);
1349 pr_debug("%s: returning rc=%d\n", __func__
, rc
);
1354 * init_pcr() - initialize the provisioning and control registers
1355 * @cfg: Internal structure associated with the host.
1357 * Also sets up fast access to the mapped registers and initializes AFU
1358 * command fields that never change.
1360 static void init_pcr(struct cxlflash_cfg
*cfg
)
1362 struct afu
*afu
= cfg
->afu
;
1363 struct sisl_ctrl_map __iomem
*ctrl_map
;
1366 for (i
= 0; i
< MAX_CONTEXT
; i
++) {
1367 ctrl_map
= &afu
->afu_map
->ctrls
[i
].ctrl
;
1368 /* Disrupt any clients that could be running */
1369 /* e.g. clients that survived a master restart */
1370 writeq_be(0, &ctrl_map
->rht_start
);
1371 writeq_be(0, &ctrl_map
->rht_cnt_id
);
1372 writeq_be(0, &ctrl_map
->ctx_cap
);
1375 /* Copy frequently used fields into afu */
1376 afu
->ctx_hndl
= (u16
) cxl_process_element(cfg
->mcctx
);
1377 afu
->host_map
= &afu
->afu_map
->hosts
[afu
->ctx_hndl
].host
;
1378 afu
->ctrl_map
= &afu
->afu_map
->ctrls
[afu
->ctx_hndl
].ctrl
;
1380 /* Program the Endian Control for the master context */
1381 writeq_be(SISL_ENDIAN_CTRL
, &afu
->host_map
->endian_ctrl
);
1385 * init_global() - initialize AFU global registers
1386 * @cfg: Internal structure associated with the host.
1388 static int init_global(struct cxlflash_cfg
*cfg
)
1390 struct afu
*afu
= cfg
->afu
;
1391 struct device
*dev
= &cfg
->dev
->dev
;
1392 u64 wwpn
[NUM_FC_PORTS
]; /* wwpn of AFU ports */
1393 int i
= 0, num_ports
= 0;
1397 rc
= read_vpd(cfg
, &wwpn
[0]);
1399 dev_err(dev
, "%s: could not read vpd rc=%d\n", __func__
, rc
);
1403 pr_debug("%s: wwpn0=0x%llX wwpn1=0x%llX\n", __func__
, wwpn
[0], wwpn
[1]);
1405 /* Set up RRQ in AFU for master issued cmds */
1406 writeq_be((u64
) afu
->hrrq_start
, &afu
->host_map
->rrq_start
);
1407 writeq_be((u64
) afu
->hrrq_end
, &afu
->host_map
->rrq_end
);
1409 /* AFU configuration */
1410 reg
= readq_be(&afu
->afu_map
->global
.regs
.afu_config
);
1411 reg
|= SISL_AFUCONF_AR_ALL
|SISL_AFUCONF_ENDIAN
;
1412 /* enable all auto retry options and control endianness */
1413 /* leave others at default: */
1414 /* CTX_CAP write protected, mbox_r does not clear on read and */
1415 /* checker on if dual afu */
1416 writeq_be(reg
, &afu
->afu_map
->global
.regs
.afu_config
);
1418 /* Global port select: select either port */
1419 if (afu
->internal_lun
) {
1420 /* Only use port 0 */
1421 writeq_be(PORT0
, &afu
->afu_map
->global
.regs
.afu_port_sel
);
1422 num_ports
= NUM_FC_PORTS
- 1;
1424 writeq_be(BOTH_PORTS
, &afu
->afu_map
->global
.regs
.afu_port_sel
);
1425 num_ports
= NUM_FC_PORTS
;
1428 for (i
= 0; i
< num_ports
; i
++) {
1429 /* Unmask all errors (but they are still masked at AFU) */
1430 writeq_be(0, &afu
->afu_map
->global
.fc_regs
[i
][FC_ERRMSK
/ 8]);
1431 /* Clear CRC error cnt & set a threshold */
1432 (void)readq_be(&afu
->afu_map
->global
.
1433 fc_regs
[i
][FC_CNT_CRCERR
/ 8]);
1434 writeq_be(MC_CRC_THRESH
, &afu
->afu_map
->global
.fc_regs
[i
]
1435 [FC_CRC_THRESH
/ 8]);
1437 /* Set WWPNs. If already programmed, wwpn[i] is 0 */
1439 afu_set_wwpn(afu
, i
,
1440 &afu
->afu_map
->global
.fc_regs
[i
][0],
1442 /* Programming WWPN back to back causes additional
1443 * offline/online transitions and a PLOGI
1448 /* Set up master's own CTX_CAP to allow real mode, host translation */
1449 /* tables, afu cmds and read/write GSCSI cmds. */
1450 /* First, unlock ctx_cap write by reading mbox */
1451 (void)readq_be(&afu
->ctrl_map
->mbox_r
); /* unlock ctx_cap */
1452 writeq_be((SISL_CTX_CAP_REAL_MODE
| SISL_CTX_CAP_HOST_XLATE
|
1453 SISL_CTX_CAP_READ_CMD
| SISL_CTX_CAP_WRITE_CMD
|
1454 SISL_CTX_CAP_AFU_CMD
| SISL_CTX_CAP_GSCSI_CMD
),
1455 &afu
->ctrl_map
->ctx_cap
);
1456 /* Initialize heartbeat */
1457 afu
->hb
= readq_be(&afu
->afu_map
->global
.regs
.afu_hb
);
1464 * start_afu() - initializes and starts the AFU
1465 * @cfg: Internal structure associated with the host.
1467 static int start_afu(struct cxlflash_cfg
*cfg
)
1469 struct afu
*afu
= cfg
->afu
;
1474 /* After an AFU reset, RRQ entries are stale, clear them */
1475 memset(&afu
->rrq_entry
, 0, sizeof(afu
->rrq_entry
));
1477 /* Initialize RRQ pointers */
1478 afu
->hrrq_start
= &afu
->rrq_entry
[0];
1479 afu
->hrrq_end
= &afu
->rrq_entry
[NUM_RRQ_ENTRY
- 1];
1480 afu
->hrrq_curr
= afu
->hrrq_start
;
1483 rc
= init_global(cfg
);
1485 pr_debug("%s: returning rc=%d\n", __func__
, rc
);
1490 * init_intr() - setup interrupt handlers for the master context
1491 * @cfg: Internal structure associated with the host.
1493 * Return: 0 on success, -errno on failure
1495 static enum undo_level
init_intr(struct cxlflash_cfg
*cfg
,
1496 struct cxl_context
*ctx
)
1498 struct afu
*afu
= cfg
->afu
;
1499 struct device
*dev
= &cfg
->dev
->dev
;
1501 enum undo_level level
= UNDO_NOOP
;
1503 rc
= cxl_allocate_afu_irqs(ctx
, 3);
1505 dev_err(dev
, "%s: call to allocate_afu_irqs failed rc=%d!\n",
1511 rc
= cxl_map_afu_irq(ctx
, 1, cxlflash_sync_err_irq
, afu
,
1512 "SISL_MSI_SYNC_ERROR");
1513 if (unlikely(rc
<= 0)) {
1514 dev_err(dev
, "%s: IRQ 1 (SISL_MSI_SYNC_ERROR) map failed!\n",
1520 rc
= cxl_map_afu_irq(ctx
, 2, cxlflash_rrq_irq
, afu
,
1521 "SISL_MSI_RRQ_UPDATED");
1522 if (unlikely(rc
<= 0)) {
1523 dev_err(dev
, "%s: IRQ 2 (SISL_MSI_RRQ_UPDATED) map failed!\n",
1529 rc
= cxl_map_afu_irq(ctx
, 3, cxlflash_async_err_irq
, afu
,
1530 "SISL_MSI_ASYNC_ERROR");
1531 if (unlikely(rc
<= 0)) {
1532 dev_err(dev
, "%s: IRQ 3 (SISL_MSI_ASYNC_ERROR) map failed!\n",
1542 * init_mc() - create and register as the master context
1543 * @cfg: Internal structure associated with the host.
1545 * Return: 0 on success, -errno on failure
1547 static int init_mc(struct cxlflash_cfg
*cfg
)
1549 struct cxl_context
*ctx
;
1550 struct device
*dev
= &cfg
->dev
->dev
;
1552 enum undo_level level
;
1554 ctx
= cxl_get_context(cfg
->dev
);
1555 if (unlikely(!ctx
)) {
1561 /* Set it up as a master with the CXL */
1562 cxl_set_master(ctx
);
1564 /* During initialization reset the AFU to start from a clean slate */
1565 rc
= cxl_afu_reset(cfg
->mcctx
);
1567 dev_err(dev
, "%s: initial AFU reset failed rc=%d\n",
1572 level
= init_intr(cfg
, ctx
);
1573 if (unlikely(level
)) {
1574 dev_err(dev
, "%s: setting up interrupts failed rc=%d\n",
1579 /* This performs the equivalent of the CXL_IOCTL_START_WORK.
1580 * The CXL_IOCTL_GET_PROCESS_ELEMENT is implicit in the process
1581 * element (pe) that is embedded in the context (ctx)
1583 rc
= start_context(cfg
);
1585 dev_err(dev
, "%s: start context failed rc=%d\n", __func__
, rc
);
1586 level
= UNMAP_THREE
;
1590 pr_debug("%s: returning rc=%d\n", __func__
, rc
);
1593 term_intr(cfg
, level
);
1598 * init_afu() - setup as master context and start AFU
1599 * @cfg: Internal structure associated with the host.
1601 * This routine is a higher level of control for configuring the
1602 * AFU on probe and reset paths.
1604 * Return: 0 on success, -errno on failure
1606 static int init_afu(struct cxlflash_cfg
*cfg
)
1610 struct afu
*afu
= cfg
->afu
;
1611 struct device
*dev
= &cfg
->dev
->dev
;
1613 cxl_perst_reloads_same_image(cfg
->cxl_afu
, true);
1617 dev_err(dev
, "%s: call to init_mc failed, rc=%d!\n",
1622 /* Map the entire MMIO space of the AFU */
1623 afu
->afu_map
= cxl_psa_map(cfg
->mcctx
);
1624 if (!afu
->afu_map
) {
1625 dev_err(dev
, "%s: call to cxl_psa_map failed!\n", __func__
);
1629 kref_init(&afu
->mapcount
);
1631 /* No byte reverse on reading afu_version or string will be backwards */
1632 reg
= readq(&afu
->afu_map
->global
.regs
.afu_version
);
1633 memcpy(afu
->version
, ®
, sizeof(reg
));
1634 afu
->interface_version
=
1635 readq_be(&afu
->afu_map
->global
.regs
.interface_version
);
1636 if ((afu
->interface_version
+ 1) == 0) {
1637 pr_err("Back level AFU, please upgrade. AFU version %s "
1638 "interface version 0x%llx\n", afu
->version
,
1639 afu
->interface_version
);
1644 afu
->send_cmd
= send_cmd_ioarrin
;
1645 afu
->context_reset
= context_reset_ioarrin
;
1647 pr_debug("%s: afu version %s, interface version 0x%llX\n", __func__
,
1648 afu
->version
, afu
->interface_version
);
1650 rc
= start_afu(cfg
);
1652 dev_err(dev
, "%s: call to start_afu failed, rc=%d!\n",
1657 afu_err_intr_init(cfg
->afu
);
1658 spin_lock_init(&afu
->rrin_slock
);
1659 afu
->room
= readq_be(&afu
->host_map
->cmd_room
);
1661 /* Restore the LUN mappings */
1662 cxlflash_restore_luntable(cfg
);
1664 pr_debug("%s: returning rc=%d\n", __func__
, rc
);
1668 kref_put(&afu
->mapcount
, afu_unmap
);
1670 term_intr(cfg
, UNMAP_THREE
);
1676 * cxlflash_afu_sync() - builds and sends an AFU sync command
1677 * @afu: AFU associated with the host.
1678 * @ctx_hndl_u: Identifies context requesting sync.
1679 * @res_hndl_u: Identifies resource requesting sync.
1680 * @mode: Type of sync to issue (lightweight, heavyweight, global).
1682 * The AFU can only take 1 sync command at a time. This routine enforces this
1683 * limitation by using a mutex to provide exclusive access to the AFU during
1684 * the sync. This design point requires calling threads to not be on interrupt
1685 * context due to the possibility of sleeping during concurrent sync operations.
1687 * AFU sync operations are only necessary and allowed when the device is
1688 * operating normally. When not operating normally, sync requests can occur as
1689 * part of cleaning up resources associated with an adapter prior to removal.
1690 * In this scenario, these requests are simply ignored (safe due to the AFU
1697 int cxlflash_afu_sync(struct afu
*afu
, ctx_hndl_t ctx_hndl_u
,
1698 res_hndl_t res_hndl_u
, u8 mode
)
1700 struct cxlflash_cfg
*cfg
= afu
->parent
;
1701 struct device
*dev
= &cfg
->dev
->dev
;
1702 struct afu_cmd
*cmd
= NULL
;
1705 static DEFINE_MUTEX(sync_active
);
1707 if (cfg
->state
!= STATE_NORMAL
) {
1708 pr_debug("%s: Sync not required! (%u)\n", __func__
, cfg
->state
);
1712 mutex_lock(&sync_active
);
1713 atomic_inc(&afu
->cmds_active
);
1714 buf
= kzalloc(sizeof(*cmd
) + __alignof__(*cmd
) - 1, GFP_KERNEL
);
1715 if (unlikely(!buf
)) {
1716 dev_err(dev
, "%s: no memory for command\n", __func__
);
1721 cmd
= (struct afu_cmd
*)PTR_ALIGN(buf
, __alignof__(*cmd
));
1722 init_completion(&cmd
->cevent
);
1725 pr_debug("%s: afu=%p cmd=%p %d\n", __func__
, afu
, cmd
, ctx_hndl_u
);
1727 cmd
->rcb
.req_flags
= SISL_REQ_FLAGS_AFU_CMD
;
1728 cmd
->rcb
.ctx_id
= afu
->ctx_hndl
;
1729 cmd
->rcb
.msi
= SISL_MSI_RRQ_UPDATED
;
1730 cmd
->rcb
.timeout
= MC_AFU_SYNC_TIMEOUT
;
1732 cmd
->rcb
.cdb
[0] = 0xC0; /* AFU Sync */
1733 cmd
->rcb
.cdb
[1] = mode
;
1735 /* The cdb is aligned, no unaligned accessors required */
1736 *((__be16
*)&cmd
->rcb
.cdb
[2]) = cpu_to_be16(ctx_hndl_u
);
1737 *((__be32
*)&cmd
->rcb
.cdb
[4]) = cpu_to_be32(res_hndl_u
);
1739 rc
= afu
->send_cmd(afu
, cmd
);
1743 rc
= wait_resp(afu
, cmd
);
1747 atomic_dec(&afu
->cmds_active
);
1748 mutex_unlock(&sync_active
);
1750 pr_debug("%s: returning rc=%d\n", __func__
, rc
);
1755 * afu_reset() - resets the AFU
1756 * @cfg: Internal structure associated with the host.
1758 * Return: 0 on success, -errno on failure
1760 static int afu_reset(struct cxlflash_cfg
*cfg
)
1763 /* Stop the context before the reset. Since the context is
1764 * no longer available restart it after the reset is complete
1771 pr_debug("%s: returning rc=%d\n", __func__
, rc
);
1776 * drain_ioctls() - wait until all currently executing ioctls have completed
1777 * @cfg: Internal structure associated with the host.
1779 * Obtain write access to read/write semaphore that wraps ioctl
1780 * handling to 'drain' ioctls currently executing.
1782 static void drain_ioctls(struct cxlflash_cfg
*cfg
)
1784 down_write(&cfg
->ioctl_rwsem
);
1785 up_write(&cfg
->ioctl_rwsem
);
1789 * cxlflash_eh_device_reset_handler() - reset a single LUN
1790 * @scp: SCSI command to send.
1793 * SUCCESS as defined in scsi/scsi.h
1794 * FAILED as defined in scsi/scsi.h
1796 static int cxlflash_eh_device_reset_handler(struct scsi_cmnd
*scp
)
1799 struct Scsi_Host
*host
= scp
->device
->host
;
1800 struct cxlflash_cfg
*cfg
= (struct cxlflash_cfg
*)host
->hostdata
;
1801 struct afu
*afu
= cfg
->afu
;
1804 pr_debug("%s: (scp=%p) %d/%d/%d/%llu "
1805 "cdb=(%08X-%08X-%08X-%08X)\n", __func__
, scp
,
1806 host
->host_no
, scp
->device
->channel
,
1807 scp
->device
->id
, scp
->device
->lun
,
1808 get_unaligned_be32(&((u32
*)scp
->cmnd
)[0]),
1809 get_unaligned_be32(&((u32
*)scp
->cmnd
)[1]),
1810 get_unaligned_be32(&((u32
*)scp
->cmnd
)[2]),
1811 get_unaligned_be32(&((u32
*)scp
->cmnd
)[3]));
1814 switch (cfg
->state
) {
1816 rcr
= send_tmf(afu
, scp
, TMF_LUN_RESET
);
1821 wait_event(cfg
->reset_waitq
, cfg
->state
!= STATE_RESET
);
1828 pr_debug("%s: returning rc=%d\n", __func__
, rc
);
1833 * cxlflash_eh_host_reset_handler() - reset the host adapter
1834 * @scp: SCSI command from stack identifying host.
1836 * Following a reset, the state is evaluated again in case an EEH occurred
1837 * during the reset. In such a scenario, the host reset will either yield
1838 * until the EEH recovery is complete or return success or failure based
1839 * upon the current device state.
1842 * SUCCESS as defined in scsi/scsi.h
1843 * FAILED as defined in scsi/scsi.h
1845 static int cxlflash_eh_host_reset_handler(struct scsi_cmnd
*scp
)
1849 struct Scsi_Host
*host
= scp
->device
->host
;
1850 struct cxlflash_cfg
*cfg
= (struct cxlflash_cfg
*)host
->hostdata
;
1852 pr_debug("%s: (scp=%p) %d/%d/%d/%llu "
1853 "cdb=(%08X-%08X-%08X-%08X)\n", __func__
, scp
,
1854 host
->host_no
, scp
->device
->channel
,
1855 scp
->device
->id
, scp
->device
->lun
,
1856 get_unaligned_be32(&((u32
*)scp
->cmnd
)[0]),
1857 get_unaligned_be32(&((u32
*)scp
->cmnd
)[1]),
1858 get_unaligned_be32(&((u32
*)scp
->cmnd
)[2]),
1859 get_unaligned_be32(&((u32
*)scp
->cmnd
)[3]));
1861 switch (cfg
->state
) {
1863 cfg
->state
= STATE_RESET
;
1865 cxlflash_mark_contexts_error(cfg
);
1866 rcr
= afu_reset(cfg
);
1869 cfg
->state
= STATE_FAILTERM
;
1871 cfg
->state
= STATE_NORMAL
;
1872 wake_up_all(&cfg
->reset_waitq
);
1876 wait_event(cfg
->reset_waitq
, cfg
->state
!= STATE_RESET
);
1877 if (cfg
->state
== STATE_NORMAL
)
1885 pr_debug("%s: returning rc=%d\n", __func__
, rc
);
1890 * cxlflash_change_queue_depth() - change the queue depth for the device
1891 * @sdev: SCSI device destined for queue depth change.
1892 * @qdepth: Requested queue depth value to set.
1894 * The requested queue depth is capped to the maximum supported value.
1896 * Return: The actual queue depth set.
1898 static int cxlflash_change_queue_depth(struct scsi_device
*sdev
, int qdepth
)
1901 if (qdepth
> CXLFLASH_MAX_CMDS_PER_LUN
)
1902 qdepth
= CXLFLASH_MAX_CMDS_PER_LUN
;
1904 scsi_change_queue_depth(sdev
, qdepth
);
1905 return sdev
->queue_depth
;
1909 * cxlflash_show_port_status() - queries and presents the current port status
1910 * @port: Desired port for status reporting.
1911 * @afu: AFU owning the specified port.
1912 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
1914 * Return: The size of the ASCII string returned in @buf.
1916 static ssize_t
cxlflash_show_port_status(u32 port
, struct afu
*afu
, char *buf
)
1920 __be64 __iomem
*fc_regs
;
1922 if (port
>= NUM_FC_PORTS
)
1925 fc_regs
= &afu
->afu_map
->global
.fc_regs
[port
][0];
1926 status
= readq_be(&fc_regs
[FC_MTIP_STATUS
/ 8]);
1927 status
&= FC_MTIP_STATUS_MASK
;
1929 if (status
== FC_MTIP_STATUS_ONLINE
)
1930 disp_status
= "online";
1931 else if (status
== FC_MTIP_STATUS_OFFLINE
)
1932 disp_status
= "offline";
1934 disp_status
= "unknown";
1936 return scnprintf(buf
, PAGE_SIZE
, "%s\n", disp_status
);
1940 * port0_show() - queries and presents the current status of port 0
1941 * @dev: Generic device associated with the host owning the port.
1942 * @attr: Device attribute representing the port.
1943 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
1945 * Return: The size of the ASCII string returned in @buf.
1947 static ssize_t
port0_show(struct device
*dev
,
1948 struct device_attribute
*attr
,
1951 struct Scsi_Host
*shost
= class_to_shost(dev
);
1952 struct cxlflash_cfg
*cfg
= (struct cxlflash_cfg
*)shost
->hostdata
;
1953 struct afu
*afu
= cfg
->afu
;
1955 return cxlflash_show_port_status(0, afu
, buf
);
1959 * port1_show() - queries and presents the current status of port 1
1960 * @dev: Generic device associated with the host owning the port.
1961 * @attr: Device attribute representing the port.
1962 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
1964 * Return: The size of the ASCII string returned in @buf.
1966 static ssize_t
port1_show(struct device
*dev
,
1967 struct device_attribute
*attr
,
1970 struct Scsi_Host
*shost
= class_to_shost(dev
);
1971 struct cxlflash_cfg
*cfg
= (struct cxlflash_cfg
*)shost
->hostdata
;
1972 struct afu
*afu
= cfg
->afu
;
1974 return cxlflash_show_port_status(1, afu
, buf
);
1978 * lun_mode_show() - presents the current LUN mode of the host
1979 * @dev: Generic device associated with the host.
1980 * @attr: Device attribute representing the LUN mode.
1981 * @buf: Buffer of length PAGE_SIZE to report back the LUN mode in ASCII.
1983 * Return: The size of the ASCII string returned in @buf.
1985 static ssize_t
lun_mode_show(struct device
*dev
,
1986 struct device_attribute
*attr
, char *buf
)
1988 struct Scsi_Host
*shost
= class_to_shost(dev
);
1989 struct cxlflash_cfg
*cfg
= (struct cxlflash_cfg
*)shost
->hostdata
;
1990 struct afu
*afu
= cfg
->afu
;
1992 return scnprintf(buf
, PAGE_SIZE
, "%u\n", afu
->internal_lun
);
1996 * lun_mode_store() - sets the LUN mode of the host
1997 * @dev: Generic device associated with the host.
1998 * @attr: Device attribute representing the LUN mode.
1999 * @buf: Buffer of length PAGE_SIZE containing the LUN mode in ASCII.
2000 * @count: Length of data resizing in @buf.
2002 * The CXL Flash AFU supports a dummy LUN mode where the external
2003 * links and storage are not required. Space on the FPGA is used
2004 * to create 1 or 2 small LUNs which are presented to the system
2005 * as if they were a normal storage device. This feature is useful
2006 * during development and also provides manufacturing with a way
2007 * to test the AFU without an actual device.
2009 * 0 = external LUN[s] (default)
2010 * 1 = internal LUN (1 x 64K, 512B blocks, id 0)
2011 * 2 = internal LUN (1 x 64K, 4K blocks, id 0)
2012 * 3 = internal LUN (2 x 32K, 512B blocks, ids 0,1)
2013 * 4 = internal LUN (2 x 32K, 4K blocks, ids 0,1)
2015 * Return: The size of the ASCII string returned in @buf.
2017 static ssize_t
lun_mode_store(struct device
*dev
,
2018 struct device_attribute
*attr
,
2019 const char *buf
, size_t count
)
2021 struct Scsi_Host
*shost
= class_to_shost(dev
);
2022 struct cxlflash_cfg
*cfg
= (struct cxlflash_cfg
*)shost
->hostdata
;
2023 struct afu
*afu
= cfg
->afu
;
2027 rc
= kstrtouint(buf
, 10, &lun_mode
);
2028 if (!rc
&& (lun_mode
< 5) && (lun_mode
!= afu
->internal_lun
)) {
2029 afu
->internal_lun
= lun_mode
;
2032 * When configured for internal LUN, there is only one channel,
2033 * channel number 0, else there will be 2 (default).
2035 if (afu
->internal_lun
)
2036 shost
->max_channel
= 0;
2038 shost
->max_channel
= NUM_FC_PORTS
- 1;
2041 scsi_scan_host(cfg
->host
);
2048 * ioctl_version_show() - presents the current ioctl version of the host
2049 * @dev: Generic device associated with the host.
2050 * @attr: Device attribute representing the ioctl version.
2051 * @buf: Buffer of length PAGE_SIZE to report back the ioctl version.
2053 * Return: The size of the ASCII string returned in @buf.
2055 static ssize_t
ioctl_version_show(struct device
*dev
,
2056 struct device_attribute
*attr
, char *buf
)
2058 return scnprintf(buf
, PAGE_SIZE
, "%u\n", DK_CXLFLASH_VERSION_0
);
2062 * cxlflash_show_port_lun_table() - queries and presents the port LUN table
2063 * @port: Desired port for status reporting.
2064 * @afu: AFU owning the specified port.
2065 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
2067 * Return: The size of the ASCII string returned in @buf.
2069 static ssize_t
cxlflash_show_port_lun_table(u32 port
,
2075 __be64 __iomem
*fc_port
;
2077 if (port
>= NUM_FC_PORTS
)
2080 fc_port
= &afu
->afu_map
->global
.fc_port
[port
][0];
2082 for (i
= 0; i
< CXLFLASH_NUM_VLUNS
; i
++)
2083 bytes
+= scnprintf(buf
+ bytes
, PAGE_SIZE
- bytes
,
2084 "%03d: %016llX\n", i
, readq_be(&fc_port
[i
]));
2089 * port0_lun_table_show() - presents the current LUN table of port 0
2090 * @dev: Generic device associated with the host owning the port.
2091 * @attr: Device attribute representing the port.
2092 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
2094 * Return: The size of the ASCII string returned in @buf.
2096 static ssize_t
port0_lun_table_show(struct device
*dev
,
2097 struct device_attribute
*attr
,
2100 struct Scsi_Host
*shost
= class_to_shost(dev
);
2101 struct cxlflash_cfg
*cfg
= (struct cxlflash_cfg
*)shost
->hostdata
;
2102 struct afu
*afu
= cfg
->afu
;
2104 return cxlflash_show_port_lun_table(0, afu
, buf
);
2108 * port1_lun_table_show() - presents the current LUN table of port 1
2109 * @dev: Generic device associated with the host owning the port.
2110 * @attr: Device attribute representing the port.
2111 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
2113 * Return: The size of the ASCII string returned in @buf.
2115 static ssize_t
port1_lun_table_show(struct device
*dev
,
2116 struct device_attribute
*attr
,
2119 struct Scsi_Host
*shost
= class_to_shost(dev
);
2120 struct cxlflash_cfg
*cfg
= (struct cxlflash_cfg
*)shost
->hostdata
;
2121 struct afu
*afu
= cfg
->afu
;
2123 return cxlflash_show_port_lun_table(1, afu
, buf
);
2127 * mode_show() - presents the current mode of the device
2128 * @dev: Generic device associated with the device.
2129 * @attr: Device attribute representing the device mode.
2130 * @buf: Buffer of length PAGE_SIZE to report back the dev mode in ASCII.
2132 * Return: The size of the ASCII string returned in @buf.
2134 static ssize_t
mode_show(struct device
*dev
,
2135 struct device_attribute
*attr
, char *buf
)
2137 struct scsi_device
*sdev
= to_scsi_device(dev
);
2139 return scnprintf(buf
, PAGE_SIZE
, "%s\n",
2140 sdev
->hostdata
? "superpipe" : "legacy");
2146 static DEVICE_ATTR_RO(port0
);
2147 static DEVICE_ATTR_RO(port1
);
2148 static DEVICE_ATTR_RW(lun_mode
);
2149 static DEVICE_ATTR_RO(ioctl_version
);
2150 static DEVICE_ATTR_RO(port0_lun_table
);
2151 static DEVICE_ATTR_RO(port1_lun_table
);
2153 static struct device_attribute
*cxlflash_host_attrs
[] = {
2157 &dev_attr_ioctl_version
,
2158 &dev_attr_port0_lun_table
,
2159 &dev_attr_port1_lun_table
,
2166 static DEVICE_ATTR_RO(mode
);
2168 static struct device_attribute
*cxlflash_dev_attrs
[] = {
2176 static struct scsi_host_template driver_template
= {
2177 .module
= THIS_MODULE
,
2178 .name
= CXLFLASH_ADAPTER_NAME
,
2179 .info
= cxlflash_driver_info
,
2180 .ioctl
= cxlflash_ioctl
,
2181 .proc_name
= CXLFLASH_NAME
,
2182 .queuecommand
= cxlflash_queuecommand
,
2183 .eh_device_reset_handler
= cxlflash_eh_device_reset_handler
,
2184 .eh_host_reset_handler
= cxlflash_eh_host_reset_handler
,
2185 .change_queue_depth
= cxlflash_change_queue_depth
,
2186 .cmd_per_lun
= CXLFLASH_MAX_CMDS_PER_LUN
,
2187 .can_queue
= CXLFLASH_MAX_CMDS
,
2188 .cmd_size
= sizeof(struct afu_cmd
) + __alignof__(struct afu_cmd
) - 1,
2190 .sg_tablesize
= 1, /* No scatter gather support */
2191 .max_sectors
= CXLFLASH_MAX_SECTORS
,
2192 .use_clustering
= ENABLE_CLUSTERING
,
2193 .shost_attrs
= cxlflash_host_attrs
,
2194 .sdev_attrs
= cxlflash_dev_attrs
,
2198 * Device dependent values
2200 static struct dev_dependent_vals dev_corsa_vals
= { CXLFLASH_MAX_SECTORS
,
2202 static struct dev_dependent_vals dev_flash_gt_vals
= { CXLFLASH_MAX_SECTORS
,
2203 CXLFLASH_NOTIFY_SHUTDOWN
};
2206 * PCI device binding table
2208 static struct pci_device_id cxlflash_pci_table
[] = {
2209 {PCI_VENDOR_ID_IBM
, PCI_DEVICE_ID_IBM_CORSA
,
2210 PCI_ANY_ID
, PCI_ANY_ID
, 0, 0, (kernel_ulong_t
)&dev_corsa_vals
},
2211 {PCI_VENDOR_ID_IBM
, PCI_DEVICE_ID_IBM_FLASH_GT
,
2212 PCI_ANY_ID
, PCI_ANY_ID
, 0, 0, (kernel_ulong_t
)&dev_flash_gt_vals
},
2216 MODULE_DEVICE_TABLE(pci
, cxlflash_pci_table
);
2219 * cxlflash_worker_thread() - work thread handler for the AFU
2220 * @work: Work structure contained within cxlflash associated with host.
2222 * Handles the following events:
2223 * - Link reset which cannot be performed on interrupt context due to
2224 * blocking up to a few seconds
2227 static void cxlflash_worker_thread(struct work_struct
*work
)
2229 struct cxlflash_cfg
*cfg
= container_of(work
, struct cxlflash_cfg
,
2231 struct afu
*afu
= cfg
->afu
;
2232 struct device
*dev
= &cfg
->dev
->dev
;
2236 /* Avoid MMIO if the device has failed */
2238 if (cfg
->state
!= STATE_NORMAL
)
2241 spin_lock_irqsave(cfg
->host
->host_lock
, lock_flags
);
2243 if (cfg
->lr_state
== LINK_RESET_REQUIRED
) {
2244 port
= cfg
->lr_port
;
2246 dev_err(dev
, "%s: invalid port index %d\n",
2249 spin_unlock_irqrestore(cfg
->host
->host_lock
,
2252 /* The reset can block... */
2253 afu_link_reset(afu
, port
,
2254 &afu
->afu_map
->global
.fc_regs
[port
][0]);
2255 spin_lock_irqsave(cfg
->host
->host_lock
, lock_flags
);
2258 cfg
->lr_state
= LINK_RESET_COMPLETE
;
2261 spin_unlock_irqrestore(cfg
->host
->host_lock
, lock_flags
);
2263 if (atomic_dec_if_positive(&cfg
->scan_host_needed
) >= 0)
2264 scsi_scan_host(cfg
->host
);
2265 kref_put(&afu
->mapcount
, afu_unmap
);
2269 * cxlflash_probe() - PCI entry point to add host
2270 * @pdev: PCI device associated with the host.
2271 * @dev_id: PCI device id associated with device.
2273 * Return: 0 on success, -errno on failure
2275 static int cxlflash_probe(struct pci_dev
*pdev
,
2276 const struct pci_device_id
*dev_id
)
2278 struct Scsi_Host
*host
;
2279 struct cxlflash_cfg
*cfg
= NULL
;
2280 struct dev_dependent_vals
*ddv
;
2283 dev_dbg(&pdev
->dev
, "%s: Found CXLFLASH with IRQ: %d\n",
2284 __func__
, pdev
->irq
);
2286 ddv
= (struct dev_dependent_vals
*)dev_id
->driver_data
;
2287 driver_template
.max_sectors
= ddv
->max_sectors
;
2289 host
= scsi_host_alloc(&driver_template
, sizeof(struct cxlflash_cfg
));
2291 dev_err(&pdev
->dev
, "%s: call to scsi_host_alloc failed!\n",
2297 host
->max_id
= CXLFLASH_MAX_NUM_TARGETS_PER_BUS
;
2298 host
->max_lun
= CXLFLASH_MAX_NUM_LUNS_PER_TARGET
;
2299 host
->max_channel
= NUM_FC_PORTS
- 1;
2300 host
->unique_id
= host
->host_no
;
2301 host
->max_cmd_len
= CXLFLASH_MAX_CDB_LEN
;
2303 cfg
= (struct cxlflash_cfg
*)host
->hostdata
;
2305 rc
= alloc_mem(cfg
);
2307 dev_err(&pdev
->dev
, "%s: call to alloc_mem failed!\n",
2310 scsi_host_put(cfg
->host
);
2314 cfg
->init_state
= INIT_STATE_NONE
;
2316 cfg
->cxl_fops
= cxlflash_cxl_fops
;
2319 * The promoted LUNs move to the top of the LUN table. The rest stay
2320 * on the bottom half. The bottom half grows from the end
2321 * (index = 255), whereas the top half grows from the beginning
2324 cfg
->promote_lun_index
= 0;
2325 cfg
->last_lun_index
[0] = CXLFLASH_NUM_VLUNS
/2 - 1;
2326 cfg
->last_lun_index
[1] = CXLFLASH_NUM_VLUNS
/2 - 1;
2328 cfg
->dev_id
= (struct pci_device_id
*)dev_id
;
2330 init_waitqueue_head(&cfg
->tmf_waitq
);
2331 init_waitqueue_head(&cfg
->reset_waitq
);
2333 INIT_WORK(&cfg
->work_q
, cxlflash_worker_thread
);
2334 cfg
->lr_state
= LINK_RESET_INVALID
;
2336 spin_lock_init(&cfg
->tmf_slock
);
2337 mutex_init(&cfg
->ctx_tbl_list_mutex
);
2338 mutex_init(&cfg
->ctx_recovery_mutex
);
2339 init_rwsem(&cfg
->ioctl_rwsem
);
2340 INIT_LIST_HEAD(&cfg
->ctx_err_recovery
);
2341 INIT_LIST_HEAD(&cfg
->lluns
);
2343 pci_set_drvdata(pdev
, cfg
);
2345 cfg
->cxl_afu
= cxl_pci_to_afu(pdev
);
2349 dev_err(&pdev
->dev
, "%s: call to init_pci "
2350 "failed rc=%d!\n", __func__
, rc
);
2353 cfg
->init_state
= INIT_STATE_PCI
;
2357 dev_err(&pdev
->dev
, "%s: call to init_afu "
2358 "failed rc=%d!\n", __func__
, rc
);
2361 cfg
->init_state
= INIT_STATE_AFU
;
2363 rc
= init_scsi(cfg
);
2365 dev_err(&pdev
->dev
, "%s: call to init_scsi "
2366 "failed rc=%d!\n", __func__
, rc
);
2369 cfg
->init_state
= INIT_STATE_SCSI
;
2372 pr_debug("%s: returning rc=%d\n", __func__
, rc
);
2376 cxlflash_remove(pdev
);
2381 * cxlflash_pci_error_detected() - called when a PCI error is detected
2382 * @pdev: PCI device struct.
2383 * @state: PCI channel state.
2385 * When an EEH occurs during an active reset, wait until the reset is
2386 * complete and then take action based upon the device state.
2388 * Return: PCI_ERS_RESULT_NEED_RESET or PCI_ERS_RESULT_DISCONNECT
2390 static pci_ers_result_t
cxlflash_pci_error_detected(struct pci_dev
*pdev
,
2391 pci_channel_state_t state
)
2394 struct cxlflash_cfg
*cfg
= pci_get_drvdata(pdev
);
2395 struct device
*dev
= &cfg
->dev
->dev
;
2397 dev_dbg(dev
, "%s: pdev=%p state=%u\n", __func__
, pdev
, state
);
2400 case pci_channel_io_frozen
:
2401 wait_event(cfg
->reset_waitq
, cfg
->state
!= STATE_RESET
);
2402 if (cfg
->state
== STATE_FAILTERM
)
2403 return PCI_ERS_RESULT_DISCONNECT
;
2405 cfg
->state
= STATE_RESET
;
2406 scsi_block_requests(cfg
->host
);
2408 rc
= cxlflash_mark_contexts_error(cfg
);
2410 dev_err(dev
, "%s: Failed to mark user contexts!(%d)\n",
2413 return PCI_ERS_RESULT_NEED_RESET
;
2414 case pci_channel_io_perm_failure
:
2415 cfg
->state
= STATE_FAILTERM
;
2416 wake_up_all(&cfg
->reset_waitq
);
2417 scsi_unblock_requests(cfg
->host
);
2418 return PCI_ERS_RESULT_DISCONNECT
;
2422 return PCI_ERS_RESULT_NEED_RESET
;
2426 * cxlflash_pci_slot_reset() - called when PCI slot has been reset
2427 * @pdev: PCI device struct.
2429 * This routine is called by the pci error recovery code after the PCI
2430 * slot has been reset, just before we should resume normal operations.
2432 * Return: PCI_ERS_RESULT_RECOVERED or PCI_ERS_RESULT_DISCONNECT
2434 static pci_ers_result_t
cxlflash_pci_slot_reset(struct pci_dev
*pdev
)
2437 struct cxlflash_cfg
*cfg
= pci_get_drvdata(pdev
);
2438 struct device
*dev
= &cfg
->dev
->dev
;
2440 dev_dbg(dev
, "%s: pdev=%p\n", __func__
, pdev
);
2444 dev_err(dev
, "%s: EEH recovery failed! (%d)\n", __func__
, rc
);
2445 return PCI_ERS_RESULT_DISCONNECT
;
2448 return PCI_ERS_RESULT_RECOVERED
;
2452 * cxlflash_pci_resume() - called when normal operation can resume
2453 * @pdev: PCI device struct
2455 static void cxlflash_pci_resume(struct pci_dev
*pdev
)
2457 struct cxlflash_cfg
*cfg
= pci_get_drvdata(pdev
);
2458 struct device
*dev
= &cfg
->dev
->dev
;
2460 dev_dbg(dev
, "%s: pdev=%p\n", __func__
, pdev
);
2462 cfg
->state
= STATE_NORMAL
;
2463 wake_up_all(&cfg
->reset_waitq
);
2464 scsi_unblock_requests(cfg
->host
);
2467 static const struct pci_error_handlers cxlflash_err_handler
= {
2468 .error_detected
= cxlflash_pci_error_detected
,
2469 .slot_reset
= cxlflash_pci_slot_reset
,
2470 .resume
= cxlflash_pci_resume
,
2474 * PCI device structure
2476 static struct pci_driver cxlflash_driver
= {
2477 .name
= CXLFLASH_NAME
,
2478 .id_table
= cxlflash_pci_table
,
2479 .probe
= cxlflash_probe
,
2480 .remove
= cxlflash_remove
,
2481 .shutdown
= cxlflash_remove
,
2482 .err_handler
= &cxlflash_err_handler
,
2486 * init_cxlflash() - module entry point
2488 * Return: 0 on success, -errno on failure
2490 static int __init
init_cxlflash(void)
2492 pr_info("%s: %s\n", __func__
, CXLFLASH_ADAPTER_NAME
);
2494 cxlflash_list_init();
2496 return pci_register_driver(&cxlflash_driver
);
2500 * exit_cxlflash() - module exit point
2502 static void __exit
exit_cxlflash(void)
2504 cxlflash_term_global_luns();
2505 cxlflash_free_errpage();
2507 pci_unregister_driver(&cxlflash_driver
);
2510 module_init(init_cxlflash
);
2511 module_exit(exit_cxlflash
);