2 * Channel subsystem base support.
4 * Copyright 2012 IBM Corp.
5 * Author(s): Cornelia Huck <cornelia.huck@de.ibm.com>
7 * This work is licensed under the terms of the GNU GPL, version 2 or (at
8 * your option) any later version. See the COPYING file in the top-level
12 #include "qemu/osdep.h"
13 #include "qapi/error.h"
14 #include "qapi/visitor.h"
16 #include "qemu/error-report.h"
17 #include "qemu/bitops.h"
18 #include "qemu/error-report.h"
19 #include "exec/address-spaces.h"
21 #include "hw/s390x/ioinst.h"
22 #include "hw/s390x/css.h"
24 #include "hw/s390x/s390_flic.h"
25 #include "hw/s390x/s390-virtio-ccw.h"
27 typedef struct CrwContainer
{
29 QTAILQ_ENTRY(CrwContainer
) sibling
;
32 typedef struct ChpInfo
{
38 typedef struct SubchSet
{
39 SubchDev
*sch
[MAX_SCHID
+ 1];
40 unsigned long schids_used
[BITS_TO_LONGS(MAX_SCHID
+ 1)];
41 unsigned long devnos_used
[BITS_TO_LONGS(MAX_SCHID
+ 1)];
44 static const VMStateDescription vmstate_scsw
= {
47 .minimum_version_id
= 1,
48 .fields
= (VMStateField
[]) {
49 VMSTATE_UINT16(flags
, SCSW
),
50 VMSTATE_UINT16(ctrl
, SCSW
),
51 VMSTATE_UINT32(cpa
, SCSW
),
52 VMSTATE_UINT8(dstat
, SCSW
),
53 VMSTATE_UINT8(cstat
, SCSW
),
54 VMSTATE_UINT16(count
, SCSW
),
59 static const VMStateDescription vmstate_pmcw
= {
62 .minimum_version_id
= 1,
63 .fields
= (VMStateField
[]) {
64 VMSTATE_UINT32(intparm
, PMCW
),
65 VMSTATE_UINT16(flags
, PMCW
),
66 VMSTATE_UINT16(devno
, PMCW
),
67 VMSTATE_UINT8(lpm
, PMCW
),
68 VMSTATE_UINT8(pnom
, PMCW
),
69 VMSTATE_UINT8(lpum
, PMCW
),
70 VMSTATE_UINT8(pim
, PMCW
),
71 VMSTATE_UINT16(mbi
, PMCW
),
72 VMSTATE_UINT8(pom
, PMCW
),
73 VMSTATE_UINT8(pam
, PMCW
),
74 VMSTATE_UINT8_ARRAY(chpid
, PMCW
, 8),
75 VMSTATE_UINT32(chars
, PMCW
),
80 static const VMStateDescription vmstate_schib
= {
83 .minimum_version_id
= 1,
84 .fields
= (VMStateField
[]) {
85 VMSTATE_STRUCT(pmcw
, SCHIB
, 0, vmstate_pmcw
, PMCW
),
86 VMSTATE_STRUCT(scsw
, SCHIB
, 0, vmstate_scsw
, SCSW
),
87 VMSTATE_UINT64(mba
, SCHIB
),
88 VMSTATE_UINT8_ARRAY(mda
, SCHIB
, 4),
94 static const VMStateDescription vmstate_ccw1
= {
97 .minimum_version_id
= 1,
98 .fields
= (VMStateField
[]) {
99 VMSTATE_UINT8(cmd_code
, CCW1
),
100 VMSTATE_UINT8(flags
, CCW1
),
101 VMSTATE_UINT16(count
, CCW1
),
102 VMSTATE_UINT32(cda
, CCW1
),
103 VMSTATE_END_OF_LIST()
107 static const VMStateDescription vmstate_ciw
= {
110 .minimum_version_id
= 1,
111 .fields
= (VMStateField
[]) {
112 VMSTATE_UINT8(type
, CIW
),
113 VMSTATE_UINT8(command
, CIW
),
114 VMSTATE_UINT16(count
, CIW
),
115 VMSTATE_END_OF_LIST()
119 static const VMStateDescription vmstate_sense_id
= {
120 .name
= "s390_sense_id",
122 .minimum_version_id
= 1,
123 .fields
= (VMStateField
[]) {
124 VMSTATE_UINT8(reserved
, SenseId
),
125 VMSTATE_UINT16(cu_type
, SenseId
),
126 VMSTATE_UINT8(cu_model
, SenseId
),
127 VMSTATE_UINT16(dev_type
, SenseId
),
128 VMSTATE_UINT8(dev_model
, SenseId
),
129 VMSTATE_UINT8(unused
, SenseId
),
130 VMSTATE_STRUCT_ARRAY(ciw
, SenseId
, MAX_CIWS
, 0, vmstate_ciw
, CIW
),
131 VMSTATE_END_OF_LIST()
135 static int subch_dev_post_load(void *opaque
, int version_id
);
136 static void subch_dev_pre_save(void *opaque
);
138 const char err_hint_devno
[] = "Devno mismatch, tried to load wrong section!"
139 " Likely reason: some sequences of plug and unplug can break"
140 " migration for machine versions prior to 2.7 (known design flaw).";
142 const VMStateDescription vmstate_subch_dev
= {
143 .name
= "s390_subch_dev",
145 .minimum_version_id
= 1,
146 .post_load
= subch_dev_post_load
,
147 .pre_save
= subch_dev_pre_save
,
148 .fields
= (VMStateField
[]) {
149 VMSTATE_UINT8_EQUAL(cssid
, SubchDev
, "Bug!"),
150 VMSTATE_UINT8_EQUAL(ssid
, SubchDev
, "Bug!"),
151 VMSTATE_UINT16(migrated_schid
, SubchDev
),
152 VMSTATE_UINT16_EQUAL(devno
, SubchDev
, err_hint_devno
),
153 VMSTATE_BOOL(thinint_active
, SubchDev
),
154 VMSTATE_STRUCT(curr_status
, SubchDev
, 0, vmstate_schib
, SCHIB
),
155 VMSTATE_UINT8_ARRAY(sense_data
, SubchDev
, 32),
156 VMSTATE_UINT64(channel_prog
, SubchDev
),
157 VMSTATE_STRUCT(last_cmd
, SubchDev
, 0, vmstate_ccw1
, CCW1
),
158 VMSTATE_BOOL(last_cmd_valid
, SubchDev
),
159 VMSTATE_STRUCT(id
, SubchDev
, 0, vmstate_sense_id
, SenseId
),
160 VMSTATE_BOOL(ccw_fmt_1
, SubchDev
),
161 VMSTATE_UINT8(ccw_no_data_cnt
, SubchDev
),
162 VMSTATE_END_OF_LIST()
166 typedef struct IndAddrPtrTmp
{
172 static int post_load_ind_addr(void *opaque
, int version_id
)
174 IndAddrPtrTmp
*ptmp
= opaque
;
175 IndAddr
**ind_addr
= ptmp
->parent
;
177 if (ptmp
->len
!= 0) {
178 *ind_addr
= get_indicator(ptmp
->addr
, ptmp
->len
);
185 static void pre_save_ind_addr(void *opaque
)
187 IndAddrPtrTmp
*ptmp
= opaque
;
188 IndAddr
*ind_addr
= *(ptmp
->parent
);
190 if (ind_addr
!= NULL
) {
191 ptmp
->len
= ind_addr
->len
;
192 ptmp
->addr
= ind_addr
->addr
;
199 const VMStateDescription vmstate_ind_addr_tmp
= {
200 .name
= "s390_ind_addr_tmp",
201 .pre_save
= pre_save_ind_addr
,
202 .post_load
= post_load_ind_addr
,
204 .fields
= (VMStateField
[]) {
205 VMSTATE_INT32(len
, IndAddrPtrTmp
),
206 VMSTATE_UINT64(addr
, IndAddrPtrTmp
),
207 VMSTATE_END_OF_LIST()
211 const VMStateDescription vmstate_ind_addr
= {
212 .name
= "s390_ind_addr_tmp",
213 .fields
= (VMStateField
[]) {
214 VMSTATE_WITH_TMP(IndAddr
*, IndAddrPtrTmp
, vmstate_ind_addr_tmp
),
215 VMSTATE_END_OF_LIST()
219 typedef struct CssImage
{
220 SubchSet
*sch_set
[MAX_SSID
+ 1];
221 ChpInfo chpids
[MAX_CHPID
+ 1];
224 typedef struct IoAdapter
{
230 typedef struct ChannelSubSys
{
231 QTAILQ_HEAD(, CrwContainer
) pending_crws
;
238 uint64_t chnmon_area
;
239 CssImage
*css
[MAX_CSSID
+ 1];
240 uint8_t default_cssid
;
241 IoAdapter
*io_adapters
[CSS_IO_ADAPTER_TYPE_NUMS
][MAX_ISC
+ 1];
242 QTAILQ_HEAD(, IndAddr
) indicator_addresses
;
245 static ChannelSubSys channel_subsys
= {
246 .pending_crws
= QTAILQ_HEAD_INITIALIZER(channel_subsys
.pending_crws
),
248 .sei_pending
= false,
251 .chnmon_active
= false,
252 .indicator_addresses
=
253 QTAILQ_HEAD_INITIALIZER(channel_subsys
.indicator_addresses
),
256 static void subch_dev_pre_save(void *opaque
)
258 SubchDev
*s
= opaque
;
260 /* Prepare remote_schid for save */
261 s
->migrated_schid
= s
->schid
;
264 static int subch_dev_post_load(void *opaque
, int version_id
)
267 SubchDev
*s
= opaque
;
269 /* Re-assign the subchannel to remote_schid if necessary */
270 if (s
->migrated_schid
!= s
->schid
) {
271 if (css_find_subch(true, s
->cssid
, s
->ssid
, s
->schid
) == s
) {
273 * Cleanup the slot before moving to s->migrated_schid provided
274 * it still belongs to us, i.e. it was not changed by previous
275 * invocation of this function.
277 css_subch_assign(s
->cssid
, s
->ssid
, s
->schid
, s
->devno
, NULL
);
279 /* It's OK to re-assign without a prior de-assign. */
280 s
->schid
= s
->migrated_schid
;
281 css_subch_assign(s
->cssid
, s
->ssid
, s
->schid
, s
->devno
, s
);
285 * Hack alert. If we don't migrate the channel subsystem status
286 * we still need to find out if the guest enabled mss/mcss-e.
287 * If the subchannel is enabled, it certainly was able to access it,
288 * so adjust the max_ssid/max_cssid values for relevant ssid/cssid
289 * values. This is not watertight, but better than nothing.
291 if (s
->curr_status
.pmcw
.flags
& PMCW_FLAGS_MASK_ENA
) {
293 channel_subsys
.max_ssid
= MAX_SSID
;
295 if (s
->cssid
!= channel_subsys
.default_cssid
) {
296 channel_subsys
.max_cssid
= MAX_CSSID
;
302 IndAddr
*get_indicator(hwaddr ind_addr
, int len
)
306 QTAILQ_FOREACH(indicator
, &channel_subsys
.indicator_addresses
, sibling
) {
307 if (indicator
->addr
== ind_addr
) {
312 indicator
= g_new0(IndAddr
, 1);
313 indicator
->addr
= ind_addr
;
314 indicator
->len
= len
;
315 indicator
->refcnt
= 1;
316 QTAILQ_INSERT_TAIL(&channel_subsys
.indicator_addresses
,
321 static int s390_io_adapter_map(AdapterInfo
*adapter
, uint64_t map_addr
,
324 S390FLICState
*fs
= s390_get_flic();
325 S390FLICStateClass
*fsc
= S390_FLIC_COMMON_GET_CLASS(fs
);
327 return fsc
->io_adapter_map(fs
, adapter
->adapter_id
, map_addr
, do_map
);
330 void release_indicator(AdapterInfo
*adapter
, IndAddr
*indicator
)
332 assert(indicator
->refcnt
> 0);
334 if (indicator
->refcnt
> 0) {
337 QTAILQ_REMOVE(&channel_subsys
.indicator_addresses
, indicator
, sibling
);
338 if (indicator
->map
) {
339 s390_io_adapter_map(adapter
, indicator
->map
, false);
344 int map_indicator(AdapterInfo
*adapter
, IndAddr
*indicator
)
348 if (indicator
->map
) {
349 return 0; /* already mapped is not an error */
351 indicator
->map
= indicator
->addr
;
352 ret
= s390_io_adapter_map(adapter
, indicator
->map
, true);
353 if ((ret
!= 0) && (ret
!= -ENOSYS
)) {
363 int css_create_css_image(uint8_t cssid
, bool default_image
)
365 trace_css_new_image(cssid
, default_image
? "(default)" : "");
366 /* 255 is reserved */
370 if (channel_subsys
.css
[cssid
]) {
373 channel_subsys
.css
[cssid
] = g_malloc0(sizeof(CssImage
));
375 channel_subsys
.default_cssid
= cssid
;
380 uint32_t css_get_adapter_id(CssIoAdapterType type
, uint8_t isc
)
382 if (type
>= CSS_IO_ADAPTER_TYPE_NUMS
|| isc
> MAX_ISC
||
383 !channel_subsys
.io_adapters
[type
][isc
]) {
387 return channel_subsys
.io_adapters
[type
][isc
]->id
;
391 * css_register_io_adapters: Register I/O adapters per ISC during init
393 * @swap: an indication if byte swap is needed.
394 * @maskable: an indication if the adapter is subject to the mask operation.
395 * @errp: location to store error information.
397 void css_register_io_adapters(CssIoAdapterType type
, bool swap
, bool maskable
,
403 S390FLICState
*fs
= s390_get_flic();
404 S390FLICStateClass
*fsc
= S390_FLIC_COMMON_GET_CLASS(fs
);
407 * Disallow multiple registrations for the same device type.
408 * Report an error if registering for an already registered type.
410 if (channel_subsys
.io_adapters
[type
][0]) {
411 error_setg(errp
, "Adapters for type %d already registered", type
);
414 for (isc
= 0; isc
<= MAX_ISC
; isc
++) {
415 id
= (type
<< 3) | isc
;
416 ret
= fsc
->register_io_adapter(fs
, id
, isc
, swap
, maskable
);
418 adapter
= g_new0(IoAdapter
, 1);
421 adapter
->type
= type
;
422 channel_subsys
.io_adapters
[type
][isc
] = adapter
;
424 error_setg_errno(errp
, -ret
, "Unexpected error %d when "
425 "registering adapter %d", ret
, id
);
431 * No need to free registered adapters in kvm: kvm will clean up
432 * when the machine goes away.
435 for (isc
--; isc
>= 0; isc
--) {
436 g_free(channel_subsys
.io_adapters
[type
][isc
]);
437 channel_subsys
.io_adapters
[type
][isc
] = NULL
;
443 static void css_clear_io_interrupt(uint16_t subchannel_id
,
444 uint16_t subchannel_nr
)
447 static bool no_clear_irq
;
448 S390FLICState
*fs
= s390_get_flic();
449 S390FLICStateClass
*fsc
= S390_FLIC_COMMON_GET_CLASS(fs
);
452 if (unlikely(no_clear_irq
)) {
455 r
= fsc
->clear_io_irq(fs
, subchannel_id
, subchannel_nr
);
462 * Ignore unavailability, as the user can't do anything
467 error_setg_errno(&err
, -r
, "unexpected error condition");
468 error_propagate(&error_abort
, err
);
472 static inline uint16_t css_do_build_subchannel_id(uint8_t cssid
, uint8_t ssid
)
474 if (channel_subsys
.max_cssid
> 0) {
475 return (cssid
<< 8) | (1 << 3) | (ssid
<< 1) | 1;
477 return (ssid
<< 1) | 1;
480 uint16_t css_build_subchannel_id(SubchDev
*sch
)
482 return css_do_build_subchannel_id(sch
->cssid
, sch
->ssid
);
485 void css_inject_io_interrupt(SubchDev
*sch
)
487 uint8_t isc
= (sch
->curr_status
.pmcw
.flags
& PMCW_FLAGS_MASK_ISC
) >> 11;
489 trace_css_io_interrupt(sch
->cssid
, sch
->ssid
, sch
->schid
,
490 sch
->curr_status
.pmcw
.intparm
, isc
, "");
491 s390_io_interrupt(css_build_subchannel_id(sch
),
493 sch
->curr_status
.pmcw
.intparm
,
497 void css_conditional_io_interrupt(SubchDev
*sch
)
500 * If the subchannel is not currently status pending, make it pending
503 if (!(sch
->curr_status
.scsw
.ctrl
& SCSW_STCTL_STATUS_PEND
)) {
504 uint8_t isc
= (sch
->curr_status
.pmcw
.flags
& PMCW_FLAGS_MASK_ISC
) >> 11;
506 trace_css_io_interrupt(sch
->cssid
, sch
->ssid
, sch
->schid
,
507 sch
->curr_status
.pmcw
.intparm
, isc
,
509 sch
->curr_status
.scsw
.ctrl
&= ~SCSW_CTRL_MASK_STCTL
;
510 sch
->curr_status
.scsw
.ctrl
|=
511 SCSW_STCTL_ALERT
| SCSW_STCTL_STATUS_PEND
;
512 /* Inject an I/O interrupt. */
513 s390_io_interrupt(css_build_subchannel_id(sch
),
515 sch
->curr_status
.pmcw
.intparm
,
520 void css_adapter_interrupt(uint8_t isc
)
522 uint32_t io_int_word
= (isc
<< 27) | IO_INT_WORD_AI
;
524 trace_css_adapter_interrupt(isc
);
525 s390_io_interrupt(0, 0, 0, io_int_word
);
528 static void sch_handle_clear_func(SubchDev
*sch
)
530 PMCW
*p
= &sch
->curr_status
.pmcw
;
531 SCSW
*s
= &sch
->curr_status
.scsw
;
534 /* Path management: In our simple css, we always choose the only path. */
537 /* Reset values prior to 'issuing the clear signal'. */
540 s
->flags
&= ~SCSW_FLAGS_MASK_PNO
;
542 /* We always 'attempt to issue the clear signal', and we always succeed. */
543 sch
->channel_prog
= 0x0;
544 sch
->last_cmd_valid
= false;
545 s
->ctrl
&= ~SCSW_ACTL_CLEAR_PEND
;
546 s
->ctrl
|= SCSW_STCTL_STATUS_PEND
;
554 static void sch_handle_halt_func(SubchDev
*sch
)
557 PMCW
*p
= &sch
->curr_status
.pmcw
;
558 SCSW
*s
= &sch
->curr_status
.scsw
;
559 hwaddr curr_ccw
= sch
->channel_prog
;
562 /* Path management: In our simple css, we always choose the only path. */
565 /* We always 'attempt to issue the halt signal', and we always succeed. */
566 sch
->channel_prog
= 0x0;
567 sch
->last_cmd_valid
= false;
568 s
->ctrl
&= ~SCSW_ACTL_HALT_PEND
;
569 s
->ctrl
|= SCSW_STCTL_STATUS_PEND
;
571 if ((s
->ctrl
& (SCSW_ACTL_SUBCH_ACTIVE
| SCSW_ACTL_DEVICE_ACTIVE
)) ||
572 !((s
->ctrl
& SCSW_ACTL_START_PEND
) ||
573 (s
->ctrl
& SCSW_ACTL_SUSP
))) {
574 s
->dstat
= SCSW_DSTAT_DEVICE_END
;
576 if ((s
->ctrl
& (SCSW_ACTL_SUBCH_ACTIVE
| SCSW_ACTL_DEVICE_ACTIVE
)) ||
577 (s
->ctrl
& SCSW_ACTL_SUSP
)) {
578 s
->cpa
= curr_ccw
+ 8;
585 static void copy_sense_id_to_guest(SenseId
*dest
, SenseId
*src
)
589 dest
->reserved
= src
->reserved
;
590 dest
->cu_type
= cpu_to_be16(src
->cu_type
);
591 dest
->cu_model
= src
->cu_model
;
592 dest
->dev_type
= cpu_to_be16(src
->dev_type
);
593 dest
->dev_model
= src
->dev_model
;
594 dest
->unused
= src
->unused
;
595 for (i
= 0; i
< ARRAY_SIZE(dest
->ciw
); i
++) {
596 dest
->ciw
[i
].type
= src
->ciw
[i
].type
;
597 dest
->ciw
[i
].command
= src
->ciw
[i
].command
;
598 dest
->ciw
[i
].count
= cpu_to_be16(src
->ciw
[i
].count
);
602 static CCW1
copy_ccw_from_guest(hwaddr addr
, bool fmt1
)
609 cpu_physical_memory_read(addr
, &tmp1
, sizeof(tmp1
));
610 ret
.cmd_code
= tmp1
.cmd_code
;
611 ret
.flags
= tmp1
.flags
;
612 ret
.count
= be16_to_cpu(tmp1
.count
);
613 ret
.cda
= be32_to_cpu(tmp1
.cda
);
615 cpu_physical_memory_read(addr
, &tmp0
, sizeof(tmp0
));
616 if ((tmp0
.cmd_code
& 0x0f) == CCW_CMD_TIC
) {
617 ret
.cmd_code
= CCW_CMD_TIC
;
621 ret
.cmd_code
= tmp0
.cmd_code
;
622 ret
.flags
= tmp0
.flags
;
623 ret
.count
= be16_to_cpu(tmp0
.count
);
625 ret
.cda
= be16_to_cpu(tmp0
.cda1
) | (tmp0
.cda0
<< 16);
630 static int css_interpret_ccw(SubchDev
*sch
, hwaddr ccw_addr
,
631 bool suspend_allowed
)
642 /* Translate everything to format-1 ccws - the information is the same. */
643 ccw
= copy_ccw_from_guest(ccw_addr
, sch
->ccw_fmt_1
);
645 /* Check for invalid command codes. */
646 if ((ccw
.cmd_code
& 0x0f) == 0) {
649 if (((ccw
.cmd_code
& 0x0f) == CCW_CMD_TIC
) &&
650 ((ccw
.cmd_code
& 0xf0) != 0)) {
653 if (!sch
->ccw_fmt_1
&& (ccw
.count
== 0) &&
654 (ccw
.cmd_code
!= CCW_CMD_TIC
)) {
658 /* We don't support MIDA. */
659 if (ccw
.flags
& CCW_FLAG_MIDA
) {
663 if (ccw
.flags
& CCW_FLAG_SUSPEND
) {
664 return suspend_allowed
? -EINPROGRESS
: -EINVAL
;
667 check_len
= !((ccw
.flags
& CCW_FLAG_SLI
) && !(ccw
.flags
& CCW_FLAG_DC
));
670 if (sch
->ccw_no_data_cnt
== 255) {
673 sch
->ccw_no_data_cnt
++;
676 /* Look at the command. */
677 switch (ccw
.cmd_code
) {
682 case CCW_CMD_BASIC_SENSE
:
684 if (ccw
.count
!= sizeof(sch
->sense_data
)) {
689 len
= MIN(ccw
.count
, sizeof(sch
->sense_data
));
690 cpu_physical_memory_write(ccw
.cda
, sch
->sense_data
, len
);
691 sch
->curr_status
.scsw
.count
= ccw
.count
- len
;
692 memset(sch
->sense_data
, 0, sizeof(sch
->sense_data
));
695 case CCW_CMD_SENSE_ID
:
699 copy_sense_id_to_guest(&sense_id
, &sch
->id
);
700 /* Sense ID information is device specific. */
702 if (ccw
.count
!= sizeof(sense_id
)) {
707 len
= MIN(ccw
.count
, sizeof(sense_id
));
709 * Only indicate 0xff in the first sense byte if we actually
710 * have enough place to store at least bytes 0-3.
713 sense_id
.reserved
= 0xff;
715 sense_id
.reserved
= 0;
717 cpu_physical_memory_write(ccw
.cda
, &sense_id
, len
);
718 sch
->curr_status
.scsw
.count
= ccw
.count
- len
;
723 if (sch
->last_cmd_valid
&& (sch
->last_cmd
.cmd_code
== CCW_CMD_TIC
)) {
727 if (ccw
.flags
& (CCW_FLAG_CC
| CCW_FLAG_DC
)) {
731 sch
->channel_prog
= ccw
.cda
;
736 /* Handle device specific commands. */
737 ret
= sch
->ccw_cb(sch
, ccw
);
744 sch
->last_cmd_valid
= true;
746 if (ccw
.flags
& CCW_FLAG_CC
) {
747 sch
->channel_prog
+= 8;
755 static void sch_handle_start_func_virtual(SubchDev
*sch
, ORB
*orb
)
758 PMCW
*p
= &sch
->curr_status
.pmcw
;
759 SCSW
*s
= &sch
->curr_status
.scsw
;
762 bool suspend_allowed
;
764 /* Path management: In our simple css, we always choose the only path. */
767 if (!(s
->ctrl
& SCSW_ACTL_SUSP
)) {
768 /* Start Function triggered via ssch, i.e. we have an ORB */
771 /* Look at the orb and try to execute the channel program. */
772 assert(orb
!= NULL
); /* resume does not pass an orb */
773 p
->intparm
= orb
->intparm
;
774 if (!(orb
->lpm
& path
)) {
775 /* Generate a deferred cc 3 condition. */
776 s
->flags
|= SCSW_FLAGS_MASK_CC
;
777 s
->ctrl
&= ~SCSW_CTRL_MASK_STCTL
;
778 s
->ctrl
|= (SCSW_STCTL_ALERT
| SCSW_STCTL_STATUS_PEND
);
781 sch
->ccw_fmt_1
= !!(orb
->ctrl0
& ORB_CTRL0_MASK_FMT
);
782 s
->flags
|= (sch
->ccw_fmt_1
) ? SCSW_FLAGS_MASK_FMT
: 0;
783 sch
->ccw_no_data_cnt
= 0;
784 suspend_allowed
= !!(orb
->ctrl0
& ORB_CTRL0_MASK_SPND
);
786 /* Start Function resumed via rsch, i.e. we don't have an
788 s
->ctrl
&= ~(SCSW_ACTL_SUSP
| SCSW_ACTL_RESUME_PEND
);
789 /* The channel program had been suspended before. */
790 suspend_allowed
= true;
792 sch
->last_cmd_valid
= false;
794 ret
= css_interpret_ccw(sch
, sch
->channel_prog
, suspend_allowed
);
797 /* ccw chain, continue processing */
801 s
->ctrl
&= ~SCSW_ACTL_START_PEND
;
802 s
->ctrl
&= ~SCSW_CTRL_MASK_STCTL
;
803 s
->ctrl
|= SCSW_STCTL_PRIMARY
| SCSW_STCTL_SECONDARY
|
804 SCSW_STCTL_STATUS_PEND
;
805 s
->dstat
= SCSW_DSTAT_CHANNEL_END
| SCSW_DSTAT_DEVICE_END
;
806 s
->cpa
= sch
->channel_prog
+ 8;
809 /* I/O errors, status depends on specific devices */
812 /* unsupported command, generate unit check (command reject) */
813 s
->ctrl
&= ~SCSW_ACTL_START_PEND
;
814 s
->dstat
= SCSW_DSTAT_UNIT_CHECK
;
815 /* Set sense bit 0 in ecw0. */
816 sch
->sense_data
[0] = 0x80;
817 s
->ctrl
&= ~SCSW_CTRL_MASK_STCTL
;
818 s
->ctrl
|= SCSW_STCTL_PRIMARY
| SCSW_STCTL_SECONDARY
|
819 SCSW_STCTL_ALERT
| SCSW_STCTL_STATUS_PEND
;
820 s
->cpa
= sch
->channel_prog
+ 8;
823 /* memory problem, generate channel data check */
824 s
->ctrl
&= ~SCSW_ACTL_START_PEND
;
825 s
->cstat
= SCSW_CSTAT_DATA_CHECK
;
826 s
->ctrl
&= ~SCSW_CTRL_MASK_STCTL
;
827 s
->ctrl
|= SCSW_STCTL_PRIMARY
| SCSW_STCTL_SECONDARY
|
828 SCSW_STCTL_ALERT
| SCSW_STCTL_STATUS_PEND
;
829 s
->cpa
= sch
->channel_prog
+ 8;
832 /* subchannel busy, generate deferred cc 1 */
833 s
->flags
&= ~SCSW_FLAGS_MASK_CC
;
834 s
->flags
|= (1 << 8);
835 s
->ctrl
&= ~SCSW_CTRL_MASK_STCTL
;
836 s
->ctrl
|= SCSW_STCTL_ALERT
| SCSW_STCTL_STATUS_PEND
;
839 /* channel program has been suspended */
840 s
->ctrl
&= ~SCSW_ACTL_START_PEND
;
841 s
->ctrl
|= SCSW_ACTL_SUSP
;
844 /* error, generate channel program check */
845 s
->ctrl
&= ~SCSW_ACTL_START_PEND
;
846 s
->cstat
= SCSW_CSTAT_PROG_CHECK
;
847 s
->ctrl
&= ~SCSW_CTRL_MASK_STCTL
;
848 s
->ctrl
|= SCSW_STCTL_PRIMARY
| SCSW_STCTL_SECONDARY
|
849 SCSW_STCTL_ALERT
| SCSW_STCTL_STATUS_PEND
;
850 s
->cpa
= sch
->channel_prog
+ 8;
853 } while (ret
== -EAGAIN
);
857 static int sch_handle_start_func_passthrough(SubchDev
*sch
, ORB
*orb
)
860 PMCW
*p
= &sch
->curr_status
.pmcw
;
861 SCSW
*s
= &sch
->curr_status
.scsw
;
864 if (!(s
->ctrl
& SCSW_ACTL_SUSP
)) {
866 p
->intparm
= orb
->intparm
;
870 * Only support prefetch enable mode.
871 * Only support 64bit addressing idal.
873 if (!(orb
->ctrl0
& ORB_CTRL0_MASK_PFCH
) ||
874 !(orb
->ctrl0
& ORB_CTRL0_MASK_C64
)) {
878 ret
= s390_ccw_cmd_request(orb
, s
, sch
->driver_data
);
880 /* Currently we don't update control block and just return the cc code. */
888 /* Let's reflect an inaccessible host device by cc 3. */
893 * All other return codes will trigger a program check,
903 * On real machines, this would run asynchronously to the main vcpus.
904 * We might want to make some parts of the ssch handling (interpreting
905 * read/writes) asynchronous later on if we start supporting more than
906 * our current very simple devices.
908 int do_subchannel_work_virtual(SubchDev
*sch
, ORB
*orb
)
911 SCSW
*s
= &sch
->curr_status
.scsw
;
913 if (s
->ctrl
& SCSW_FCTL_CLEAR_FUNC
) {
914 sch_handle_clear_func(sch
);
915 } else if (s
->ctrl
& SCSW_FCTL_HALT_FUNC
) {
916 sch_handle_halt_func(sch
);
917 } else if (s
->ctrl
& SCSW_FCTL_START_FUNC
) {
918 /* Triggered by both ssch and rsch. */
919 sch_handle_start_func_virtual(sch
, orb
);
924 css_inject_io_interrupt(sch
);
928 int do_subchannel_work_passthrough(SubchDev
*sch
, ORB
*orb
)
931 SCSW
*s
= &sch
->curr_status
.scsw
;
933 if (s
->ctrl
& SCSW_FCTL_CLEAR_FUNC
) {
934 /* TODO: Clear handling */
935 sch_handle_clear_func(sch
);
937 } else if (s
->ctrl
& SCSW_FCTL_HALT_FUNC
) {
938 /* TODO: Halt handling */
939 sch_handle_halt_func(sch
);
941 } else if (s
->ctrl
& SCSW_FCTL_START_FUNC
) {
942 ret
= sch_handle_start_func_passthrough(sch
, orb
);
951 static int do_subchannel_work(SubchDev
*sch
, ORB
*orb
)
953 if (sch
->do_subchannel_work
) {
954 return sch
->do_subchannel_work(sch
, orb
);
960 static void copy_pmcw_to_guest(PMCW
*dest
, const PMCW
*src
)
964 dest
->intparm
= cpu_to_be32(src
->intparm
);
965 dest
->flags
= cpu_to_be16(src
->flags
);
966 dest
->devno
= cpu_to_be16(src
->devno
);
967 dest
->lpm
= src
->lpm
;
968 dest
->pnom
= src
->pnom
;
969 dest
->lpum
= src
->lpum
;
970 dest
->pim
= src
->pim
;
971 dest
->mbi
= cpu_to_be16(src
->mbi
);
972 dest
->pom
= src
->pom
;
973 dest
->pam
= src
->pam
;
974 for (i
= 0; i
< ARRAY_SIZE(dest
->chpid
); i
++) {
975 dest
->chpid
[i
] = src
->chpid
[i
];
977 dest
->chars
= cpu_to_be32(src
->chars
);
980 void copy_scsw_to_guest(SCSW
*dest
, const SCSW
*src
)
982 dest
->flags
= cpu_to_be16(src
->flags
);
983 dest
->ctrl
= cpu_to_be16(src
->ctrl
);
984 dest
->cpa
= cpu_to_be32(src
->cpa
);
985 dest
->dstat
= src
->dstat
;
986 dest
->cstat
= src
->cstat
;
987 dest
->count
= cpu_to_be16(src
->count
);
990 static void copy_schib_to_guest(SCHIB
*dest
, const SCHIB
*src
)
994 copy_pmcw_to_guest(&dest
->pmcw
, &src
->pmcw
);
995 copy_scsw_to_guest(&dest
->scsw
, &src
->scsw
);
996 dest
->mba
= cpu_to_be64(src
->mba
);
997 for (i
= 0; i
< ARRAY_SIZE(dest
->mda
); i
++) {
998 dest
->mda
[i
] = src
->mda
[i
];
1002 int css_do_stsch(SubchDev
*sch
, SCHIB
*schib
)
1004 /* Use current status. */
1005 copy_schib_to_guest(schib
, &sch
->curr_status
);
1009 static void copy_pmcw_from_guest(PMCW
*dest
, const PMCW
*src
)
1013 dest
->intparm
= be32_to_cpu(src
->intparm
);
1014 dest
->flags
= be16_to_cpu(src
->flags
);
1015 dest
->devno
= be16_to_cpu(src
->devno
);
1016 dest
->lpm
= src
->lpm
;
1017 dest
->pnom
= src
->pnom
;
1018 dest
->lpum
= src
->lpum
;
1019 dest
->pim
= src
->pim
;
1020 dest
->mbi
= be16_to_cpu(src
->mbi
);
1021 dest
->pom
= src
->pom
;
1022 dest
->pam
= src
->pam
;
1023 for (i
= 0; i
< ARRAY_SIZE(dest
->chpid
); i
++) {
1024 dest
->chpid
[i
] = src
->chpid
[i
];
1026 dest
->chars
= be32_to_cpu(src
->chars
);
1029 static void copy_scsw_from_guest(SCSW
*dest
, const SCSW
*src
)
1031 dest
->flags
= be16_to_cpu(src
->flags
);
1032 dest
->ctrl
= be16_to_cpu(src
->ctrl
);
1033 dest
->cpa
= be32_to_cpu(src
->cpa
);
1034 dest
->dstat
= src
->dstat
;
1035 dest
->cstat
= src
->cstat
;
1036 dest
->count
= be16_to_cpu(src
->count
);
1039 static void copy_schib_from_guest(SCHIB
*dest
, const SCHIB
*src
)
1043 copy_pmcw_from_guest(&dest
->pmcw
, &src
->pmcw
);
1044 copy_scsw_from_guest(&dest
->scsw
, &src
->scsw
);
1045 dest
->mba
= be64_to_cpu(src
->mba
);
1046 for (i
= 0; i
< ARRAY_SIZE(dest
->mda
); i
++) {
1047 dest
->mda
[i
] = src
->mda
[i
];
1051 int css_do_msch(SubchDev
*sch
, const SCHIB
*orig_schib
)
1053 SCSW
*s
= &sch
->curr_status
.scsw
;
1054 PMCW
*p
= &sch
->curr_status
.pmcw
;
1059 if (!(sch
->curr_status
.pmcw
.flags
& PMCW_FLAGS_MASK_DNV
)) {
1064 if (s
->ctrl
& SCSW_STCTL_STATUS_PEND
) {
1070 (SCSW_FCTL_START_FUNC
|SCSW_FCTL_HALT_FUNC
|SCSW_FCTL_CLEAR_FUNC
)) {
1075 copy_schib_from_guest(&schib
, orig_schib
);
1076 /* Only update the program-modifiable fields. */
1077 p
->intparm
= schib
.pmcw
.intparm
;
1078 oldflags
= p
->flags
;
1079 p
->flags
&= ~(PMCW_FLAGS_MASK_ISC
| PMCW_FLAGS_MASK_ENA
|
1080 PMCW_FLAGS_MASK_LM
| PMCW_FLAGS_MASK_MME
|
1081 PMCW_FLAGS_MASK_MP
);
1082 p
->flags
|= schib
.pmcw
.flags
&
1083 (PMCW_FLAGS_MASK_ISC
| PMCW_FLAGS_MASK_ENA
|
1084 PMCW_FLAGS_MASK_LM
| PMCW_FLAGS_MASK_MME
|
1085 PMCW_FLAGS_MASK_MP
);
1086 p
->lpm
= schib
.pmcw
.lpm
;
1087 p
->mbi
= schib
.pmcw
.mbi
;
1088 p
->pom
= schib
.pmcw
.pom
;
1089 p
->chars
&= ~(PMCW_CHARS_MASK_MBFC
| PMCW_CHARS_MASK_CSENSE
);
1090 p
->chars
|= schib
.pmcw
.chars
&
1091 (PMCW_CHARS_MASK_MBFC
| PMCW_CHARS_MASK_CSENSE
);
1092 sch
->curr_status
.mba
= schib
.mba
;
1094 /* Has the channel been disabled? */
1095 if (sch
->disable_cb
&& (oldflags
& PMCW_FLAGS_MASK_ENA
) != 0
1096 && (p
->flags
& PMCW_FLAGS_MASK_ENA
) == 0) {
1097 sch
->disable_cb(sch
);
1106 int css_do_xsch(SubchDev
*sch
)
1108 SCSW
*s
= &sch
->curr_status
.scsw
;
1109 PMCW
*p
= &sch
->curr_status
.pmcw
;
1112 if (~(p
->flags
) & (PMCW_FLAGS_MASK_DNV
| PMCW_FLAGS_MASK_ENA
)) {
1117 if (!(s
->ctrl
& SCSW_CTRL_MASK_FCTL
) ||
1118 ((s
->ctrl
& SCSW_CTRL_MASK_FCTL
) != SCSW_FCTL_START_FUNC
) ||
1120 (SCSW_ACTL_RESUME_PEND
| SCSW_ACTL_START_PEND
| SCSW_ACTL_SUSP
))) ||
1121 (s
->ctrl
& SCSW_ACTL_SUBCH_ACTIVE
)) {
1126 if (s
->ctrl
& SCSW_CTRL_MASK_STCTL
) {
1131 /* Cancel the current operation. */
1132 s
->ctrl
&= ~(SCSW_FCTL_START_FUNC
|
1133 SCSW_ACTL_RESUME_PEND
|
1134 SCSW_ACTL_START_PEND
|
1136 sch
->channel_prog
= 0x0;
1137 sch
->last_cmd_valid
= false;
1146 int css_do_csch(SubchDev
*sch
)
1148 SCSW
*s
= &sch
->curr_status
.scsw
;
1149 PMCW
*p
= &sch
->curr_status
.pmcw
;
1152 if (~(p
->flags
) & (PMCW_FLAGS_MASK_DNV
| PMCW_FLAGS_MASK_ENA
)) {
1157 /* Trigger the clear function. */
1158 s
->ctrl
&= ~(SCSW_CTRL_MASK_FCTL
| SCSW_CTRL_MASK_ACTL
);
1159 s
->ctrl
|= SCSW_FCTL_CLEAR_FUNC
| SCSW_ACTL_CLEAR_PEND
;
1161 do_subchannel_work(sch
, NULL
);
1168 int css_do_hsch(SubchDev
*sch
)
1170 SCSW
*s
= &sch
->curr_status
.scsw
;
1171 PMCW
*p
= &sch
->curr_status
.pmcw
;
1174 if (~(p
->flags
) & (PMCW_FLAGS_MASK_DNV
| PMCW_FLAGS_MASK_ENA
)) {
1179 if (((s
->ctrl
& SCSW_CTRL_MASK_STCTL
) == SCSW_STCTL_STATUS_PEND
) ||
1180 (s
->ctrl
& (SCSW_STCTL_PRIMARY
|
1181 SCSW_STCTL_SECONDARY
|
1182 SCSW_STCTL_ALERT
))) {
1187 if (s
->ctrl
& (SCSW_FCTL_HALT_FUNC
| SCSW_FCTL_CLEAR_FUNC
)) {
1192 /* Trigger the halt function. */
1193 s
->ctrl
|= SCSW_FCTL_HALT_FUNC
;
1194 s
->ctrl
&= ~SCSW_FCTL_START_FUNC
;
1195 if (((s
->ctrl
& SCSW_CTRL_MASK_ACTL
) ==
1196 (SCSW_ACTL_SUBCH_ACTIVE
| SCSW_ACTL_DEVICE_ACTIVE
)) &&
1197 ((s
->ctrl
& SCSW_CTRL_MASK_STCTL
) == SCSW_STCTL_INTERMEDIATE
)) {
1198 s
->ctrl
&= ~SCSW_STCTL_STATUS_PEND
;
1200 s
->ctrl
|= SCSW_ACTL_HALT_PEND
;
1202 do_subchannel_work(sch
, NULL
);
1209 static void css_update_chnmon(SubchDev
*sch
)
1211 if (!(sch
->curr_status
.pmcw
.flags
& PMCW_FLAGS_MASK_MME
)) {
1215 /* The counter is conveniently located at the beginning of the struct. */
1216 if (sch
->curr_status
.pmcw
.chars
& PMCW_CHARS_MASK_MBFC
) {
1217 /* Format 1, per-subchannel area. */
1220 count
= address_space_ldl(&address_space_memory
,
1221 sch
->curr_status
.mba
,
1222 MEMTXATTRS_UNSPECIFIED
,
1225 address_space_stl(&address_space_memory
, sch
->curr_status
.mba
, count
,
1226 MEMTXATTRS_UNSPECIFIED
, NULL
);
1228 /* Format 0, global area. */
1232 offset
= sch
->curr_status
.pmcw
.mbi
<< 5;
1233 count
= address_space_lduw(&address_space_memory
,
1234 channel_subsys
.chnmon_area
+ offset
,
1235 MEMTXATTRS_UNSPECIFIED
,
1238 address_space_stw(&address_space_memory
,
1239 channel_subsys
.chnmon_area
+ offset
, count
,
1240 MEMTXATTRS_UNSPECIFIED
, NULL
);
1244 int css_do_ssch(SubchDev
*sch
, ORB
*orb
)
1246 SCSW
*s
= &sch
->curr_status
.scsw
;
1247 PMCW
*p
= &sch
->curr_status
.pmcw
;
1250 if (~(p
->flags
) & (PMCW_FLAGS_MASK_DNV
| PMCW_FLAGS_MASK_ENA
)) {
1255 if (s
->ctrl
& SCSW_STCTL_STATUS_PEND
) {
1260 if (s
->ctrl
& (SCSW_FCTL_START_FUNC
|
1261 SCSW_FCTL_HALT_FUNC
|
1262 SCSW_FCTL_CLEAR_FUNC
)) {
1267 /* If monitoring is active, update counter. */
1268 if (channel_subsys
.chnmon_active
) {
1269 css_update_chnmon(sch
);
1271 sch
->channel_prog
= orb
->cpa
;
1272 /* Trigger the start function. */
1273 s
->ctrl
|= (SCSW_FCTL_START_FUNC
| SCSW_ACTL_START_PEND
);
1274 s
->flags
&= ~SCSW_FLAGS_MASK_PNO
;
1276 ret
= do_subchannel_work(sch
, orb
);
1282 static void copy_irb_to_guest(IRB
*dest
, const IRB
*src
, PMCW
*pmcw
,
1286 uint16_t stctl
= src
->scsw
.ctrl
& SCSW_CTRL_MASK_STCTL
;
1287 uint16_t actl
= src
->scsw
.ctrl
& SCSW_CTRL_MASK_ACTL
;
1289 copy_scsw_to_guest(&dest
->scsw
, &src
->scsw
);
1291 for (i
= 0; i
< ARRAY_SIZE(dest
->esw
); i
++) {
1292 dest
->esw
[i
] = cpu_to_be32(src
->esw
[i
]);
1294 for (i
= 0; i
< ARRAY_SIZE(dest
->ecw
); i
++) {
1295 dest
->ecw
[i
] = cpu_to_be32(src
->ecw
[i
]);
1297 *irb_len
= sizeof(*dest
) - sizeof(dest
->emw
);
1299 /* extended measurements enabled? */
1300 if ((src
->scsw
.flags
& SCSW_FLAGS_MASK_ESWF
) ||
1301 !(pmcw
->flags
& PMCW_FLAGS_MASK_TF
) ||
1302 !(pmcw
->chars
& PMCW_CHARS_MASK_XMWME
)) {
1305 /* extended measurements pending? */
1306 if (!(stctl
& SCSW_STCTL_STATUS_PEND
)) {
1309 if ((stctl
& SCSW_STCTL_PRIMARY
) ||
1310 (stctl
== SCSW_STCTL_SECONDARY
) ||
1311 ((stctl
& SCSW_STCTL_INTERMEDIATE
) && (actl
& SCSW_ACTL_SUSP
))) {
1312 for (i
= 0; i
< ARRAY_SIZE(dest
->emw
); i
++) {
1313 dest
->emw
[i
] = cpu_to_be32(src
->emw
[i
]);
1316 *irb_len
= sizeof(*dest
);
1319 int css_do_tsch_get_irb(SubchDev
*sch
, IRB
*target_irb
, int *irb_len
)
1321 SCSW
*s
= &sch
->curr_status
.scsw
;
1322 PMCW
*p
= &sch
->curr_status
.pmcw
;
1326 if (~(p
->flags
) & (PMCW_FLAGS_MASK_DNV
| PMCW_FLAGS_MASK_ENA
)) {
1330 stctl
= s
->ctrl
& SCSW_CTRL_MASK_STCTL
;
1332 /* Prepare the irb for the guest. */
1333 memset(&irb
, 0, sizeof(IRB
));
1335 /* Copy scsw from current status. */
1336 memcpy(&irb
.scsw
, s
, sizeof(SCSW
));
1337 if (stctl
& SCSW_STCTL_STATUS_PEND
) {
1338 if (s
->cstat
& (SCSW_CSTAT_DATA_CHECK
|
1339 SCSW_CSTAT_CHN_CTRL_CHK
|
1340 SCSW_CSTAT_INTF_CTRL_CHK
)) {
1341 irb
.scsw
.flags
|= SCSW_FLAGS_MASK_ESWF
;
1342 irb
.esw
[0] = 0x04804000;
1344 irb
.esw
[0] = 0x00800000;
1346 /* If a unit check is pending, copy sense data. */
1347 if ((s
->dstat
& SCSW_DSTAT_UNIT_CHECK
) &&
1348 (p
->chars
& PMCW_CHARS_MASK_CSENSE
)) {
1351 irb
.scsw
.flags
|= SCSW_FLAGS_MASK_ESWF
| SCSW_FLAGS_MASK_ECTL
;
1352 /* Attention: sense_data is already BE! */
1353 memcpy(irb
.ecw
, sch
->sense_data
, sizeof(sch
->sense_data
));
1354 for (i
= 0; i
< ARRAY_SIZE(irb
.ecw
); i
++) {
1355 irb
.ecw
[i
] = be32_to_cpu(irb
.ecw
[i
]);
1357 irb
.esw
[1] = 0x01000000 | (sizeof(sch
->sense_data
) << 8);
1360 /* Store the irb to the guest. */
1361 copy_irb_to_guest(target_irb
, &irb
, p
, irb_len
);
1363 return ((stctl
& SCSW_STCTL_STATUS_PEND
) == 0);
1366 void css_do_tsch_update_subch(SubchDev
*sch
)
1368 SCSW
*s
= &sch
->curr_status
.scsw
;
1369 PMCW
*p
= &sch
->curr_status
.pmcw
;
1374 stctl
= s
->ctrl
& SCSW_CTRL_MASK_STCTL
;
1375 fctl
= s
->ctrl
& SCSW_CTRL_MASK_FCTL
;
1376 actl
= s
->ctrl
& SCSW_CTRL_MASK_ACTL
;
1378 /* Clear conditions on subchannel, if applicable. */
1379 if (stctl
& SCSW_STCTL_STATUS_PEND
) {
1380 s
->ctrl
&= ~SCSW_CTRL_MASK_STCTL
;
1381 if ((stctl
!= (SCSW_STCTL_INTERMEDIATE
| SCSW_STCTL_STATUS_PEND
)) ||
1382 ((fctl
& SCSW_FCTL_HALT_FUNC
) &&
1383 (actl
& SCSW_ACTL_SUSP
))) {
1384 s
->ctrl
&= ~SCSW_CTRL_MASK_FCTL
;
1386 if (stctl
!= (SCSW_STCTL_INTERMEDIATE
| SCSW_STCTL_STATUS_PEND
)) {
1387 s
->flags
&= ~SCSW_FLAGS_MASK_PNO
;
1388 s
->ctrl
&= ~(SCSW_ACTL_RESUME_PEND
|
1389 SCSW_ACTL_START_PEND
|
1390 SCSW_ACTL_HALT_PEND
|
1391 SCSW_ACTL_CLEAR_PEND
|
1394 if ((actl
& SCSW_ACTL_SUSP
) &&
1395 (fctl
& SCSW_FCTL_START_FUNC
)) {
1396 s
->flags
&= ~SCSW_FLAGS_MASK_PNO
;
1397 if (fctl
& SCSW_FCTL_HALT_FUNC
) {
1398 s
->ctrl
&= ~(SCSW_ACTL_RESUME_PEND
|
1399 SCSW_ACTL_START_PEND
|
1400 SCSW_ACTL_HALT_PEND
|
1401 SCSW_ACTL_CLEAR_PEND
|
1404 s
->ctrl
&= ~SCSW_ACTL_RESUME_PEND
;
1408 /* Clear pending sense data. */
1409 if (p
->chars
& PMCW_CHARS_MASK_CSENSE
) {
1410 memset(sch
->sense_data
, 0 , sizeof(sch
->sense_data
));
1415 static void copy_crw_to_guest(CRW
*dest
, const CRW
*src
)
1417 dest
->flags
= cpu_to_be16(src
->flags
);
1418 dest
->rsid
= cpu_to_be16(src
->rsid
);
1421 int css_do_stcrw(CRW
*crw
)
1423 CrwContainer
*crw_cont
;
1426 crw_cont
= QTAILQ_FIRST(&channel_subsys
.pending_crws
);
1428 QTAILQ_REMOVE(&channel_subsys
.pending_crws
, crw_cont
, sibling
);
1429 copy_crw_to_guest(crw
, &crw_cont
->crw
);
1433 /* List was empty, turn crw machine checks on again. */
1434 memset(crw
, 0, sizeof(*crw
));
1435 channel_subsys
.do_crw_mchk
= true;
1442 static void copy_crw_from_guest(CRW
*dest
, const CRW
*src
)
1444 dest
->flags
= be16_to_cpu(src
->flags
);
1445 dest
->rsid
= be16_to_cpu(src
->rsid
);
1448 void css_undo_stcrw(CRW
*crw
)
1450 CrwContainer
*crw_cont
;
1452 crw_cont
= g_try_malloc0(sizeof(CrwContainer
));
1454 channel_subsys
.crws_lost
= true;
1457 copy_crw_from_guest(&crw_cont
->crw
, crw
);
1459 QTAILQ_INSERT_HEAD(&channel_subsys
.pending_crws
, crw_cont
, sibling
);
1462 int css_do_tpi(IOIntCode
*int_code
, int lowcore
)
1464 /* No pending interrupts for !KVM. */
1468 int css_collect_chp_desc(int m
, uint8_t cssid
, uint8_t f_chpid
, uint8_t l_chpid
,
1469 int rfmt
, void *buf
)
1473 uint32_t chpid_type_word
;
1477 css
= channel_subsys
.css
[channel_subsys
.default_cssid
];
1479 css
= channel_subsys
.css
[cssid
];
1485 for (i
= f_chpid
; i
<= l_chpid
; i
++) {
1486 if (css
->chpids
[i
].in_use
) {
1487 chpid_type_word
= 0x80000000 | (css
->chpids
[i
].type
<< 8) | i
;
1489 words
[0] = cpu_to_be32(chpid_type_word
);
1491 memcpy(buf
+ desc_size
, words
, 8);
1493 } else if (rfmt
== 1) {
1494 words
[0] = cpu_to_be32(chpid_type_word
);
1502 memcpy(buf
+ desc_size
, words
, 32);
1510 void css_do_schm(uint8_t mbk
, int update
, int dct
, uint64_t mbo
)
1512 /* dct is currently ignored (not really meaningful for our devices) */
1513 /* TODO: Don't ignore mbk. */
1514 if (update
&& !channel_subsys
.chnmon_active
) {
1515 /* Enable measuring. */
1516 channel_subsys
.chnmon_area
= mbo
;
1517 channel_subsys
.chnmon_active
= true;
1519 if (!update
&& channel_subsys
.chnmon_active
) {
1520 /* Disable measuring. */
1521 channel_subsys
.chnmon_area
= 0;
1522 channel_subsys
.chnmon_active
= false;
1526 int css_do_rsch(SubchDev
*sch
)
1528 SCSW
*s
= &sch
->curr_status
.scsw
;
1529 PMCW
*p
= &sch
->curr_status
.pmcw
;
1532 if (~(p
->flags
) & (PMCW_FLAGS_MASK_DNV
| PMCW_FLAGS_MASK_ENA
)) {
1537 if (s
->ctrl
& SCSW_STCTL_STATUS_PEND
) {
1542 if (((s
->ctrl
& SCSW_CTRL_MASK_FCTL
) != SCSW_FCTL_START_FUNC
) ||
1543 (s
->ctrl
& SCSW_ACTL_RESUME_PEND
) ||
1544 (!(s
->ctrl
& SCSW_ACTL_SUSP
))) {
1549 /* If monitoring is active, update counter. */
1550 if (channel_subsys
.chnmon_active
) {
1551 css_update_chnmon(sch
);
1554 s
->ctrl
|= SCSW_ACTL_RESUME_PEND
;
1555 do_subchannel_work(sch
, NULL
);
1562 int css_do_rchp(uint8_t cssid
, uint8_t chpid
)
1566 if (cssid
> channel_subsys
.max_cssid
) {
1569 if (channel_subsys
.max_cssid
== 0) {
1570 real_cssid
= channel_subsys
.default_cssid
;
1574 if (!channel_subsys
.css
[real_cssid
]) {
1578 if (!channel_subsys
.css
[real_cssid
]->chpids
[chpid
].in_use
) {
1582 if (!channel_subsys
.css
[real_cssid
]->chpids
[chpid
].is_virtual
) {
1584 "rchp unsupported for non-virtual chpid %x.%02x!\n",
1589 /* We don't really use a channel path, so we're done here. */
1590 css_queue_crw(CRW_RSC_CHP
, CRW_ERC_INIT
,
1591 channel_subsys
.max_cssid
> 0 ? 1 : 0, chpid
);
1592 if (channel_subsys
.max_cssid
> 0) {
1593 css_queue_crw(CRW_RSC_CHP
, CRW_ERC_INIT
, 0, real_cssid
<< 8);
1598 bool css_schid_final(int m
, uint8_t cssid
, uint8_t ssid
, uint16_t schid
)
1603 real_cssid
= (!m
&& (cssid
== 0)) ? channel_subsys
.default_cssid
: cssid
;
1604 if (ssid
> MAX_SSID
||
1605 !channel_subsys
.css
[real_cssid
] ||
1606 !channel_subsys
.css
[real_cssid
]->sch_set
[ssid
]) {
1609 set
= channel_subsys
.css
[real_cssid
]->sch_set
[ssid
];
1610 return schid
> find_last_bit(set
->schids_used
,
1611 (MAX_SCHID
+ 1) / sizeof(unsigned long));
1614 unsigned int css_find_free_chpid(uint8_t cssid
)
1616 CssImage
*css
= channel_subsys
.css
[cssid
];
1620 return MAX_CHPID
+ 1;
1623 for (chpid
= 0; chpid
<= MAX_CHPID
; chpid
++) {
1624 /* skip reserved chpid */
1625 if (chpid
== VIRTIO_CCW_CHPID
) {
1628 if (!css
->chpids
[chpid
].in_use
) {
1632 return MAX_CHPID
+ 1;
1635 static int css_add_chpid(uint8_t cssid
, uint8_t chpid
, uint8_t type
,
1640 trace_css_chpid_add(cssid
, chpid
, type
);
1641 css
= channel_subsys
.css
[cssid
];
1645 if (css
->chpids
[chpid
].in_use
) {
1648 css
->chpids
[chpid
].in_use
= 1;
1649 css
->chpids
[chpid
].type
= type
;
1650 css
->chpids
[chpid
].is_virtual
= is_virt
;
1652 css_generate_chp_crws(cssid
, chpid
);
1657 void css_sch_build_virtual_schib(SubchDev
*sch
, uint8_t chpid
, uint8_t type
)
1659 PMCW
*p
= &sch
->curr_status
.pmcw
;
1660 SCSW
*s
= &sch
->curr_status
.scsw
;
1662 CssImage
*css
= channel_subsys
.css
[sch
->cssid
];
1664 assert(css
!= NULL
);
1665 memset(p
, 0, sizeof(PMCW
));
1666 p
->flags
|= PMCW_FLAGS_MASK_DNV
;
1667 p
->devno
= sch
->devno
;
1672 p
->chpid
[0] = chpid
;
1673 if (!css
->chpids
[chpid
].in_use
) {
1674 css_add_chpid(sch
->cssid
, chpid
, type
, true);
1677 memset(s
, 0, sizeof(SCSW
));
1678 sch
->curr_status
.mba
= 0;
1679 for (i
= 0; i
< ARRAY_SIZE(sch
->curr_status
.mda
); i
++) {
1680 sch
->curr_status
.mda
[i
] = 0;
1684 SubchDev
*css_find_subch(uint8_t m
, uint8_t cssid
, uint8_t ssid
, uint16_t schid
)
1688 real_cssid
= (!m
&& (cssid
== 0)) ? channel_subsys
.default_cssid
: cssid
;
1690 if (!channel_subsys
.css
[real_cssid
]) {
1694 if (!channel_subsys
.css
[real_cssid
]->sch_set
[ssid
]) {
1698 return channel_subsys
.css
[real_cssid
]->sch_set
[ssid
]->sch
[schid
];
1702 * Return free device number in subchannel set.
1704 * Return index of the first free device number in the subchannel set
1705 * identified by @p cssid and @p ssid, beginning the search at @p
1706 * start and wrapping around at MAX_DEVNO. Return a value exceeding
1707 * MAX_SCHID if there are no free device numbers in the subchannel
1710 static uint32_t css_find_free_devno(uint8_t cssid
, uint8_t ssid
,
1715 for (round
= 0; round
<= MAX_DEVNO
; round
++) {
1716 uint16_t devno
= (start
+ round
) % MAX_DEVNO
;
1718 if (!css_devno_used(cssid
, ssid
, devno
)) {
1722 return MAX_DEVNO
+ 1;
1726 * Return first free subchannel (id) in subchannel set.
1728 * Return index of the first free subchannel in the subchannel set
1729 * identified by @p cssid and @p ssid, if there is any. Return a value
1730 * exceeding MAX_SCHID if there are no free subchannels in the
1733 static uint32_t css_find_free_subch(uint8_t cssid
, uint8_t ssid
)
1737 for (schid
= 0; schid
<= MAX_SCHID
; schid
++) {
1738 if (!css_find_subch(1, cssid
, ssid
, schid
)) {
1742 return MAX_SCHID
+ 1;
1746 * Return first free subchannel (id) in subchannel set for a device number
1748 * Verify the device number @p devno is not used yet in the subchannel
1749 * set identified by @p cssid and @p ssid. Set @p schid to the index
1750 * of the first free subchannel in the subchannel set, if there is
1751 * any. Return true if everything succeeded and false otherwise.
1753 static bool css_find_free_subch_for_devno(uint8_t cssid
, uint8_t ssid
,
1754 uint16_t devno
, uint16_t *schid
,
1757 uint32_t free_schid
;
1760 if (css_devno_used(cssid
, ssid
, devno
)) {
1761 error_setg(errp
, "Device %x.%x.%04x already exists",
1762 cssid
, ssid
, devno
);
1765 free_schid
= css_find_free_subch(cssid
, ssid
);
1766 if (free_schid
> MAX_SCHID
) {
1767 error_setg(errp
, "No free subchannel found for %x.%x.%04x",
1768 cssid
, ssid
, devno
);
1771 *schid
= free_schid
;
1776 * Return first free subchannel (id) and device number
1778 * Locate the first free subchannel and first free device number in
1779 * any of the subchannel sets of the channel subsystem identified by
1780 * @p cssid. Return false if no free subchannel / device number could
1781 * be found. Otherwise set @p ssid, @p devno and @p schid to identify
1782 * the available subchannel and device number and return true.
1784 * May modify @p ssid, @p devno and / or @p schid even if no free
1785 * subchannel / device number could be found.
1787 static bool css_find_free_subch_and_devno(uint8_t cssid
, uint8_t *ssid
,
1788 uint16_t *devno
, uint16_t *schid
,
1791 uint32_t free_schid
, free_devno
;
1793 assert(ssid
&& devno
&& schid
);
1794 for (*ssid
= 0; *ssid
<= MAX_SSID
; (*ssid
)++) {
1795 free_schid
= css_find_free_subch(cssid
, *ssid
);
1796 if (free_schid
> MAX_SCHID
) {
1799 free_devno
= css_find_free_devno(cssid
, *ssid
, free_schid
);
1800 if (free_devno
> MAX_DEVNO
) {
1803 *schid
= free_schid
;
1804 *devno
= free_devno
;
1807 error_setg(errp
, "Virtual channel subsystem is full!");
1811 bool css_subch_visible(SubchDev
*sch
)
1813 if (sch
->ssid
> channel_subsys
.max_ssid
) {
1817 if (sch
->cssid
!= channel_subsys
.default_cssid
) {
1818 return (channel_subsys
.max_cssid
> 0);
1824 bool css_present(uint8_t cssid
)
1826 return (channel_subsys
.css
[cssid
] != NULL
);
1829 bool css_devno_used(uint8_t cssid
, uint8_t ssid
, uint16_t devno
)
1831 if (!channel_subsys
.css
[cssid
]) {
1834 if (!channel_subsys
.css
[cssid
]->sch_set
[ssid
]) {
1838 return !!test_bit(devno
,
1839 channel_subsys
.css
[cssid
]->sch_set
[ssid
]->devnos_used
);
1842 void css_subch_assign(uint8_t cssid
, uint8_t ssid
, uint16_t schid
,
1843 uint16_t devno
, SubchDev
*sch
)
1848 trace_css_assign_subch(sch
? "assign" : "deassign", cssid
, ssid
, schid
,
1850 if (!channel_subsys
.css
[cssid
]) {
1852 "Suspicious call to %s (%x.%x.%04x) for non-existing css!\n",
1853 __func__
, cssid
, ssid
, schid
);
1856 css
= channel_subsys
.css
[cssid
];
1858 if (!css
->sch_set
[ssid
]) {
1859 css
->sch_set
[ssid
] = g_malloc0(sizeof(SubchSet
));
1861 s_set
= css
->sch_set
[ssid
];
1863 s_set
->sch
[schid
] = sch
;
1865 set_bit(schid
, s_set
->schids_used
);
1866 set_bit(devno
, s_set
->devnos_used
);
1868 clear_bit(schid
, s_set
->schids_used
);
1869 clear_bit(devno
, s_set
->devnos_used
);
1873 void css_queue_crw(uint8_t rsc
, uint8_t erc
, int chain
, uint16_t rsid
)
1875 CrwContainer
*crw_cont
;
1877 trace_css_crw(rsc
, erc
, rsid
, chain
? "(chained)" : "");
1878 /* TODO: Maybe use a static crw pool? */
1879 crw_cont
= g_try_malloc0(sizeof(CrwContainer
));
1881 channel_subsys
.crws_lost
= true;
1884 crw_cont
->crw
.flags
= (rsc
<< 8) | erc
;
1886 crw_cont
->crw
.flags
|= CRW_FLAGS_MASK_C
;
1888 crw_cont
->crw
.rsid
= rsid
;
1889 if (channel_subsys
.crws_lost
) {
1890 crw_cont
->crw
.flags
|= CRW_FLAGS_MASK_R
;
1891 channel_subsys
.crws_lost
= false;
1894 QTAILQ_INSERT_TAIL(&channel_subsys
.pending_crws
, crw_cont
, sibling
);
1896 if (channel_subsys
.do_crw_mchk
) {
1897 channel_subsys
.do_crw_mchk
= false;
1898 /* Inject crw pending machine check. */
1903 void css_generate_sch_crws(uint8_t cssid
, uint8_t ssid
, uint16_t schid
,
1904 int hotplugged
, int add
)
1906 uint8_t guest_cssid
;
1909 if (add
&& !hotplugged
) {
1912 if (channel_subsys
.max_cssid
== 0) {
1913 /* Default cssid shows up as 0. */
1914 guest_cssid
= (cssid
== channel_subsys
.default_cssid
) ? 0 : cssid
;
1916 /* Show real cssid to the guest. */
1917 guest_cssid
= cssid
;
1920 * Only notify for higher subchannel sets/channel subsystems if the
1921 * guest has enabled it.
1923 if ((ssid
> channel_subsys
.max_ssid
) ||
1924 (guest_cssid
> channel_subsys
.max_cssid
) ||
1925 ((channel_subsys
.max_cssid
== 0) &&
1926 (cssid
!= channel_subsys
.default_cssid
))) {
1929 chain_crw
= (channel_subsys
.max_ssid
> 0) ||
1930 (channel_subsys
.max_cssid
> 0);
1931 css_queue_crw(CRW_RSC_SUBCH
, CRW_ERC_IPI
, chain_crw
? 1 : 0, schid
);
1933 css_queue_crw(CRW_RSC_SUBCH
, CRW_ERC_IPI
, 0,
1934 (guest_cssid
<< 8) | (ssid
<< 4));
1936 /* RW_ERC_IPI --> clear pending interrupts */
1937 css_clear_io_interrupt(css_do_build_subchannel_id(cssid
, ssid
), schid
);
1940 void css_generate_chp_crws(uint8_t cssid
, uint8_t chpid
)
1945 void css_generate_css_crws(uint8_t cssid
)
1947 if (!channel_subsys
.sei_pending
) {
1948 css_queue_crw(CRW_RSC_CSS
, 0, 0, cssid
);
1950 channel_subsys
.sei_pending
= true;
1953 void css_clear_sei_pending(void)
1955 channel_subsys
.sei_pending
= false;
1958 int css_enable_mcsse(void)
1960 trace_css_enable_facility("mcsse");
1961 channel_subsys
.max_cssid
= MAX_CSSID
;
1965 int css_enable_mss(void)
1967 trace_css_enable_facility("mss");
1968 channel_subsys
.max_ssid
= MAX_SSID
;
1972 void css_reset_sch(SubchDev
*sch
)
1974 PMCW
*p
= &sch
->curr_status
.pmcw
;
1976 if ((p
->flags
& PMCW_FLAGS_MASK_ENA
) != 0 && sch
->disable_cb
) {
1977 sch
->disable_cb(sch
);
1981 p
->flags
&= ~(PMCW_FLAGS_MASK_ISC
| PMCW_FLAGS_MASK_ENA
|
1982 PMCW_FLAGS_MASK_LM
| PMCW_FLAGS_MASK_MME
|
1983 PMCW_FLAGS_MASK_MP
| PMCW_FLAGS_MASK_TF
);
1984 p
->flags
|= PMCW_FLAGS_MASK_DNV
;
1985 p
->devno
= sch
->devno
;
1993 p
->chars
&= ~(PMCW_CHARS_MASK_MBFC
| PMCW_CHARS_MASK_XMWME
|
1994 PMCW_CHARS_MASK_CSENSE
);
1996 memset(&sch
->curr_status
.scsw
, 0, sizeof(sch
->curr_status
.scsw
));
1997 sch
->curr_status
.mba
= 0;
1999 sch
->channel_prog
= 0x0;
2000 sch
->last_cmd_valid
= false;
2001 sch
->thinint_active
= false;
2004 void css_reset(void)
2006 CrwContainer
*crw_cont
;
2008 /* Clean up monitoring. */
2009 channel_subsys
.chnmon_active
= false;
2010 channel_subsys
.chnmon_area
= 0;
2012 /* Clear pending CRWs. */
2013 while ((crw_cont
= QTAILQ_FIRST(&channel_subsys
.pending_crws
))) {
2014 QTAILQ_REMOVE(&channel_subsys
.pending_crws
, crw_cont
, sibling
);
2017 channel_subsys
.sei_pending
= false;
2018 channel_subsys
.do_crw_mchk
= true;
2019 channel_subsys
.crws_lost
= false;
2021 /* Reset maximum ids. */
2022 channel_subsys
.max_cssid
= 0;
2023 channel_subsys
.max_ssid
= 0;
2026 static void get_css_devid(Object
*obj
, Visitor
*v
, const char *name
,
2027 void *opaque
, Error
**errp
)
2029 DeviceState
*dev
= DEVICE(obj
);
2030 Property
*prop
= opaque
;
2031 CssDevId
*dev_id
= qdev_get_prop_ptr(dev
, prop
);
2032 char buffer
[] = "xx.x.xxxx";
2036 if (dev_id
->valid
) {
2038 r
= snprintf(buffer
, sizeof(buffer
), "%02x.%1x.%04x", dev_id
->cssid
,
2039 dev_id
->ssid
, dev_id
->devid
);
2040 assert(r
== sizeof(buffer
) - 1);
2042 /* drop leading zero */
2043 if (dev_id
->cssid
<= 0xf) {
2047 snprintf(buffer
, sizeof(buffer
), "<unset>");
2050 visit_type_str(v
, name
, &p
, errp
);
2054 * parse <cssid>.<ssid>.<devid> and assert valid range for cssid/ssid
2056 static void set_css_devid(Object
*obj
, Visitor
*v
, const char *name
,
2057 void *opaque
, Error
**errp
)
2059 DeviceState
*dev
= DEVICE(obj
);
2060 Property
*prop
= opaque
;
2061 CssDevId
*dev_id
= qdev_get_prop_ptr(dev
, prop
);
2062 Error
*local_err
= NULL
;
2065 unsigned int cssid
, ssid
, devid
;
2067 if (dev
->realized
) {
2068 qdev_prop_set_after_realize(dev
, name
, errp
);
2072 visit_type_str(v
, name
, &str
, &local_err
);
2074 error_propagate(errp
, local_err
);
2078 num
= sscanf(str
, "%2x.%1x%n.%4x%n", &cssid
, &ssid
, &n1
, &devid
, &n2
);
2079 if (num
!= 3 || (n2
- n1
) != 5 || strlen(str
) != n2
) {
2080 error_set_from_qdev_prop_error(errp
, EINVAL
, dev
, prop
, str
);
2083 if ((cssid
> MAX_CSSID
) || (ssid
> MAX_SSID
)) {
2084 error_setg(errp
, "Invalid cssid or ssid: cssid %x, ssid %x",
2089 dev_id
->cssid
= cssid
;
2090 dev_id
->ssid
= ssid
;
2091 dev_id
->devid
= devid
;
2092 dev_id
->valid
= true;
2098 PropertyInfo css_devid_propinfo
= {
2100 .description
= "Identifier of an I/O device in the channel "
2101 "subsystem, example: fe.1.23ab",
2102 .get
= get_css_devid
,
2103 .set
= set_css_devid
,
2106 PropertyInfo css_devid_ro_propinfo
= {
2108 .description
= "Read-only identifier of an I/O device in the channel "
2109 "subsystem, example: fe.1.23ab",
2110 .get
= get_css_devid
,
2113 SubchDev
*css_create_sch(CssDevId bus_id
, bool is_virtual
, bool squash_mcss
,
2120 if (is_virtual
!= (bus_id
.cssid
== VIRTUAL_CSSID
)) {
2121 error_setg(errp
, "cssid %hhx not valid for %s devices",
2123 (is_virtual
? "virtual" : "non-virtual"));
2130 bus_id
.cssid
= channel_subsys
.default_cssid
;
2131 } else if (!channel_subsys
.css
[bus_id
.cssid
]) {
2132 css_create_css_image(bus_id
.cssid
, false);
2135 if (!css_find_free_subch_for_devno(bus_id
.cssid
, bus_id
.ssid
,
2136 bus_id
.devid
, &schid
, errp
)) {
2139 } else if (squash_mcss
|| is_virtual
) {
2140 bus_id
.cssid
= channel_subsys
.default_cssid
;
2142 if (!css_find_free_subch_and_devno(bus_id
.cssid
, &bus_id
.ssid
,
2143 &bus_id
.devid
, &schid
, errp
)) {
2147 for (bus_id
.cssid
= 0; bus_id
.cssid
< MAX_CSSID
; ++bus_id
.cssid
) {
2148 if (bus_id
.cssid
== VIRTUAL_CSSID
) {
2152 if (!channel_subsys
.css
[bus_id
.cssid
]) {
2153 css_create_css_image(bus_id
.cssid
, false);
2156 if (css_find_free_subch_and_devno(bus_id
.cssid
, &bus_id
.ssid
,
2157 &bus_id
.devid
, &schid
,
2161 if (bus_id
.cssid
== MAX_CSSID
) {
2162 error_setg(errp
, "Virtual channel subsystem is full!");
2168 sch
= g_malloc0(sizeof(*sch
));
2169 sch
->cssid
= bus_id
.cssid
;
2170 sch
->ssid
= bus_id
.ssid
;
2171 sch
->devno
= bus_id
.devid
;
2173 css_subch_assign(sch
->cssid
, sch
->ssid
, schid
, sch
->devno
, sch
);
2177 static int css_sch_get_chpids(SubchDev
*sch
, CssDevId
*dev_id
)
2183 PMCW
*p
= &sch
->curr_status
.pmcw
;
2185 fid_path
= g_strdup_printf("/sys/bus/css/devices/%x.%x.%04x/chpids",
2186 dev_id
->cssid
, dev_id
->ssid
, dev_id
->devid
);
2187 fd
= fopen(fid_path
, "r");
2189 error_report("%s: open %s failed", __func__
, fid_path
);
2194 if (fscanf(fd
, "%x %x %x %x %x %x %x %x",
2195 &chpid
[0], &chpid
[1], &chpid
[2], &chpid
[3],
2196 &chpid
[4], &chpid
[5], &chpid
[6], &chpid
[7]) != 8) {
2202 for (i
= 0; i
< ARRAY_SIZE(p
->chpid
); i
++) {
2203 p
->chpid
[i
] = chpid
[i
];
2212 static int css_sch_get_path_masks(SubchDev
*sch
, CssDevId
*dev_id
)
2216 uint32_t pim
, pam
, pom
;
2217 PMCW
*p
= &sch
->curr_status
.pmcw
;
2219 fid_path
= g_strdup_printf("/sys/bus/css/devices/%x.%x.%04x/pimpampom",
2220 dev_id
->cssid
, dev_id
->ssid
, dev_id
->devid
);
2221 fd
= fopen(fid_path
, "r");
2223 error_report("%s: open %s failed", __func__
, fid_path
);
2228 if (fscanf(fd
, "%x %x %x", &pim
, &pam
, &pom
) != 3) {
2243 static int css_sch_get_chpid_type(uint8_t chpid
, uint32_t *type
,
2249 fid_path
= g_strdup_printf("/sys/devices/css%x/chp0.%02x/type",
2250 dev_id
->cssid
, chpid
);
2251 fd
= fopen(fid_path
, "r");
2253 error_report("%s: open %s failed", __func__
, fid_path
);
2258 if (fscanf(fd
, "%x", type
) != 1) {
2271 * We currently retrieve the real device information from sysfs to build the
2272 * guest subchannel information block without considering the migration feature.
2273 * We need to revisit this problem when we want to add migration support.
2275 int css_sch_build_schib(SubchDev
*sch
, CssDevId
*dev_id
)
2277 CssImage
*css
= channel_subsys
.css
[sch
->cssid
];
2278 PMCW
*p
= &sch
->curr_status
.pmcw
;
2279 SCSW
*s
= &sch
->curr_status
.scsw
;
2283 assert(css
!= NULL
);
2284 memset(p
, 0, sizeof(PMCW
));
2285 p
->flags
|= PMCW_FLAGS_MASK_DNV
;
2286 /* We are dealing with I/O subchannels only. */
2287 p
->devno
= sch
->devno
;
2289 /* Grab path mask from sysfs. */
2290 ret
= css_sch_get_path_masks(sch
, dev_id
);
2295 /* Grab chpids from sysfs. */
2296 ret
= css_sch_get_chpids(sch
, dev_id
);
2301 /* Build chpid type. */
2302 for (i
= 0; i
< ARRAY_SIZE(p
->chpid
); i
++) {
2303 if (p
->chpid
[i
] && !css
->chpids
[p
->chpid
[i
]].in_use
) {
2304 ret
= css_sch_get_chpid_type(p
->chpid
[i
], &type
, dev_id
);
2308 css_add_chpid(sch
->cssid
, p
->chpid
[i
], type
, false);
2312 memset(s
, 0, sizeof(SCSW
));
2313 sch
->curr_status
.mba
= 0;
2314 for (i
= 0; i
< ARRAY_SIZE(sch
->curr_status
.mda
); i
++) {
2315 sch
->curr_status
.mda
[i
] = 0;