hw/arm/bcm2836: Only provide "enabled-cpus" property to multicore SoCs
[qemu.git] / hw / s390x / css.c
1 /*
2 * Channel subsystem base support.
3 *
4 * Copyright 2012 IBM Corp.
5 * Author(s): Cornelia Huck <cornelia.huck@de.ibm.com>
6 *
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
9 * directory.
10 */
11
12 #include "qemu/osdep.h"
13 #include "qapi/error.h"
14 #include "qapi/visitor.h"
15 #include "qemu/bitops.h"
16 #include "qemu/error-report.h"
17 #include "exec/address-spaces.h"
18 #include "cpu.h"
19 #include "hw/s390x/ioinst.h"
20 #include "hw/qdev-properties.h"
21 #include "hw/s390x/css.h"
22 #include "trace.h"
23 #include "hw/s390x/s390_flic.h"
24 #include "hw/s390x/s390-virtio-ccw.h"
25 #include "hw/s390x/s390-ccw.h"
26
27 typedef struct CrwContainer {
28 CRW crw;
29 QTAILQ_ENTRY(CrwContainer) sibling;
30 } CrwContainer;
31
32 static const VMStateDescription vmstate_crw = {
33 .name = "s390_crw",
34 .version_id = 1,
35 .minimum_version_id = 1,
36 .fields = (VMStateField[]) {
37 VMSTATE_UINT16(flags, CRW),
38 VMSTATE_UINT16(rsid, CRW),
39 VMSTATE_END_OF_LIST()
40 },
41 };
42
43 static const VMStateDescription vmstate_crw_container = {
44 .name = "s390_crw_container",
45 .version_id = 1,
46 .minimum_version_id = 1,
47 .fields = (VMStateField[]) {
48 VMSTATE_STRUCT(crw, CrwContainer, 0, vmstate_crw, CRW),
49 VMSTATE_END_OF_LIST()
50 },
51 };
52
53 typedef struct ChpInfo {
54 uint8_t in_use;
55 uint8_t type;
56 uint8_t is_virtual;
57 } ChpInfo;
58
59 static const VMStateDescription vmstate_chp_info = {
60 .name = "s390_chp_info",
61 .version_id = 1,
62 .minimum_version_id = 1,
63 .fields = (VMStateField[]) {
64 VMSTATE_UINT8(in_use, ChpInfo),
65 VMSTATE_UINT8(type, ChpInfo),
66 VMSTATE_UINT8(is_virtual, ChpInfo),
67 VMSTATE_END_OF_LIST()
68 }
69 };
70
71 typedef struct SubchSet {
72 SubchDev *sch[MAX_SCHID + 1];
73 unsigned long schids_used[BITS_TO_LONGS(MAX_SCHID + 1)];
74 unsigned long devnos_used[BITS_TO_LONGS(MAX_SCHID + 1)];
75 } SubchSet;
76
77 static const VMStateDescription vmstate_scsw = {
78 .name = "s390_scsw",
79 .version_id = 1,
80 .minimum_version_id = 1,
81 .fields = (VMStateField[]) {
82 VMSTATE_UINT16(flags, SCSW),
83 VMSTATE_UINT16(ctrl, SCSW),
84 VMSTATE_UINT32(cpa, SCSW),
85 VMSTATE_UINT8(dstat, SCSW),
86 VMSTATE_UINT8(cstat, SCSW),
87 VMSTATE_UINT16(count, SCSW),
88 VMSTATE_END_OF_LIST()
89 }
90 };
91
92 static const VMStateDescription vmstate_pmcw = {
93 .name = "s390_pmcw",
94 .version_id = 1,
95 .minimum_version_id = 1,
96 .fields = (VMStateField[]) {
97 VMSTATE_UINT32(intparm, PMCW),
98 VMSTATE_UINT16(flags, PMCW),
99 VMSTATE_UINT16(devno, PMCW),
100 VMSTATE_UINT8(lpm, PMCW),
101 VMSTATE_UINT8(pnom, PMCW),
102 VMSTATE_UINT8(lpum, PMCW),
103 VMSTATE_UINT8(pim, PMCW),
104 VMSTATE_UINT16(mbi, PMCW),
105 VMSTATE_UINT8(pom, PMCW),
106 VMSTATE_UINT8(pam, PMCW),
107 VMSTATE_UINT8_ARRAY(chpid, PMCW, 8),
108 VMSTATE_UINT32(chars, PMCW),
109 VMSTATE_END_OF_LIST()
110 }
111 };
112
113 static const VMStateDescription vmstate_schib = {
114 .name = "s390_schib",
115 .version_id = 1,
116 .minimum_version_id = 1,
117 .fields = (VMStateField[]) {
118 VMSTATE_STRUCT(pmcw, SCHIB, 0, vmstate_pmcw, PMCW),
119 VMSTATE_STRUCT(scsw, SCHIB, 0, vmstate_scsw, SCSW),
120 VMSTATE_UINT64(mba, SCHIB),
121 VMSTATE_UINT8_ARRAY(mda, SCHIB, 4),
122 VMSTATE_END_OF_LIST()
123 }
124 };
125
126
127 static const VMStateDescription vmstate_ccw1 = {
128 .name = "s390_ccw1",
129 .version_id = 1,
130 .minimum_version_id = 1,
131 .fields = (VMStateField[]) {
132 VMSTATE_UINT8(cmd_code, CCW1),
133 VMSTATE_UINT8(flags, CCW1),
134 VMSTATE_UINT16(count, CCW1),
135 VMSTATE_UINT32(cda, CCW1),
136 VMSTATE_END_OF_LIST()
137 }
138 };
139
140 static const VMStateDescription vmstate_ciw = {
141 .name = "s390_ciw",
142 .version_id = 1,
143 .minimum_version_id = 1,
144 .fields = (VMStateField[]) {
145 VMSTATE_UINT8(type, CIW),
146 VMSTATE_UINT8(command, CIW),
147 VMSTATE_UINT16(count, CIW),
148 VMSTATE_END_OF_LIST()
149 }
150 };
151
152 static const VMStateDescription vmstate_sense_id = {
153 .name = "s390_sense_id",
154 .version_id = 1,
155 .minimum_version_id = 1,
156 .fields = (VMStateField[]) {
157 VMSTATE_UINT8(reserved, SenseId),
158 VMSTATE_UINT16(cu_type, SenseId),
159 VMSTATE_UINT8(cu_model, SenseId),
160 VMSTATE_UINT16(dev_type, SenseId),
161 VMSTATE_UINT8(dev_model, SenseId),
162 VMSTATE_UINT8(unused, SenseId),
163 VMSTATE_STRUCT_ARRAY(ciw, SenseId, MAX_CIWS, 0, vmstate_ciw, CIW),
164 VMSTATE_END_OF_LIST()
165 }
166 };
167
168 static const VMStateDescription vmstate_orb = {
169 .name = "s390_orb",
170 .version_id = 1,
171 .minimum_version_id = 1,
172 .fields = (VMStateField[]) {
173 VMSTATE_UINT32(intparm, ORB),
174 VMSTATE_UINT16(ctrl0, ORB),
175 VMSTATE_UINT8(lpm, ORB),
176 VMSTATE_UINT8(ctrl1, ORB),
177 VMSTATE_UINT32(cpa, ORB),
178 VMSTATE_END_OF_LIST()
179 }
180 };
181
182 static bool vmstate_schdev_orb_needed(void *opaque)
183 {
184 return css_migration_enabled();
185 }
186
187 static const VMStateDescription vmstate_schdev_orb = {
188 .name = "s390_subch_dev/orb",
189 .version_id = 1,
190 .minimum_version_id = 1,
191 .needed = vmstate_schdev_orb_needed,
192 .fields = (VMStateField[]) {
193 VMSTATE_STRUCT(orb, SubchDev, 1, vmstate_orb, ORB),
194 VMSTATE_END_OF_LIST()
195 }
196 };
197
198 static int subch_dev_post_load(void *opaque, int version_id);
199 static int subch_dev_pre_save(void *opaque);
200
201 const char err_hint_devno[] = "Devno mismatch, tried to load wrong section!"
202 " Likely reason: some sequences of plug and unplug can break"
203 " migration for machine versions prior to 2.7 (known design flaw).";
204
205 const VMStateDescription vmstate_subch_dev = {
206 .name = "s390_subch_dev",
207 .version_id = 1,
208 .minimum_version_id = 1,
209 .post_load = subch_dev_post_load,
210 .pre_save = subch_dev_pre_save,
211 .fields = (VMStateField[]) {
212 VMSTATE_UINT8_EQUAL(cssid, SubchDev, "Bug!"),
213 VMSTATE_UINT8_EQUAL(ssid, SubchDev, "Bug!"),
214 VMSTATE_UINT16(migrated_schid, SubchDev),
215 VMSTATE_UINT16_EQUAL(devno, SubchDev, err_hint_devno),
216 VMSTATE_BOOL(thinint_active, SubchDev),
217 VMSTATE_STRUCT(curr_status, SubchDev, 0, vmstate_schib, SCHIB),
218 VMSTATE_UINT8_ARRAY(sense_data, SubchDev, 32),
219 VMSTATE_UINT64(channel_prog, SubchDev),
220 VMSTATE_STRUCT(last_cmd, SubchDev, 0, vmstate_ccw1, CCW1),
221 VMSTATE_BOOL(last_cmd_valid, SubchDev),
222 VMSTATE_STRUCT(id, SubchDev, 0, vmstate_sense_id, SenseId),
223 VMSTATE_BOOL(ccw_fmt_1, SubchDev),
224 VMSTATE_UINT8(ccw_no_data_cnt, SubchDev),
225 VMSTATE_END_OF_LIST()
226 },
227 .subsections = (const VMStateDescription * []) {
228 &vmstate_schdev_orb,
229 NULL
230 }
231 };
232
233 typedef struct IndAddrPtrTmp {
234 IndAddr **parent;
235 uint64_t addr;
236 int32_t len;
237 } IndAddrPtrTmp;
238
239 static int post_load_ind_addr(void *opaque, int version_id)
240 {
241 IndAddrPtrTmp *ptmp = opaque;
242 IndAddr **ind_addr = ptmp->parent;
243
244 if (ptmp->len != 0) {
245 *ind_addr = get_indicator(ptmp->addr, ptmp->len);
246 } else {
247 *ind_addr = NULL;
248 }
249 return 0;
250 }
251
252 static int pre_save_ind_addr(void *opaque)
253 {
254 IndAddrPtrTmp *ptmp = opaque;
255 IndAddr *ind_addr = *(ptmp->parent);
256
257 if (ind_addr != NULL) {
258 ptmp->len = ind_addr->len;
259 ptmp->addr = ind_addr->addr;
260 } else {
261 ptmp->len = 0;
262 ptmp->addr = 0L;
263 }
264
265 return 0;
266 }
267
268 const VMStateDescription vmstate_ind_addr_tmp = {
269 .name = "s390_ind_addr_tmp",
270 .pre_save = pre_save_ind_addr,
271 .post_load = post_load_ind_addr,
272
273 .fields = (VMStateField[]) {
274 VMSTATE_INT32(len, IndAddrPtrTmp),
275 VMSTATE_UINT64(addr, IndAddrPtrTmp),
276 VMSTATE_END_OF_LIST()
277 }
278 };
279
280 const VMStateDescription vmstate_ind_addr = {
281 .name = "s390_ind_addr_tmp",
282 .fields = (VMStateField[]) {
283 VMSTATE_WITH_TMP(IndAddr*, IndAddrPtrTmp, vmstate_ind_addr_tmp),
284 VMSTATE_END_OF_LIST()
285 }
286 };
287
288 typedef struct CssImage {
289 SubchSet *sch_set[MAX_SSID + 1];
290 ChpInfo chpids[MAX_CHPID + 1];
291 } CssImage;
292
293 static const VMStateDescription vmstate_css_img = {
294 .name = "s390_css_img",
295 .version_id = 1,
296 .minimum_version_id = 1,
297 .fields = (VMStateField[]) {
298 /* Subchannel sets have no relevant state. */
299 VMSTATE_STRUCT_ARRAY(chpids, CssImage, MAX_CHPID + 1, 0,
300 vmstate_chp_info, ChpInfo),
301 VMSTATE_END_OF_LIST()
302 }
303
304 };
305
306 typedef struct IoAdapter {
307 uint32_t id;
308 uint8_t type;
309 uint8_t isc;
310 uint8_t flags;
311 } IoAdapter;
312
313 typedef struct ChannelSubSys {
314 QTAILQ_HEAD(, CrwContainer) pending_crws;
315 bool sei_pending;
316 bool do_crw_mchk;
317 bool crws_lost;
318 uint8_t max_cssid;
319 uint8_t max_ssid;
320 bool chnmon_active;
321 uint64_t chnmon_area;
322 CssImage *css[MAX_CSSID + 1];
323 uint8_t default_cssid;
324 /* don't migrate, see css_register_io_adapters */
325 IoAdapter *io_adapters[CSS_IO_ADAPTER_TYPE_NUMS][MAX_ISC + 1];
326 /* don't migrate, see get_indicator and IndAddrPtrTmp */
327 QTAILQ_HEAD(, IndAddr) indicator_addresses;
328 } ChannelSubSys;
329
330 static const VMStateDescription vmstate_css = {
331 .name = "s390_css",
332 .version_id = 1,
333 .minimum_version_id = 1,
334 .fields = (VMStateField[]) {
335 VMSTATE_QTAILQ_V(pending_crws, ChannelSubSys, 1, vmstate_crw_container,
336 CrwContainer, sibling),
337 VMSTATE_BOOL(sei_pending, ChannelSubSys),
338 VMSTATE_BOOL(do_crw_mchk, ChannelSubSys),
339 VMSTATE_BOOL(crws_lost, ChannelSubSys),
340 /* These were kind of migrated by virtio */
341 VMSTATE_UINT8(max_cssid, ChannelSubSys),
342 VMSTATE_UINT8(max_ssid, ChannelSubSys),
343 VMSTATE_BOOL(chnmon_active, ChannelSubSys),
344 VMSTATE_UINT64(chnmon_area, ChannelSubSys),
345 VMSTATE_ARRAY_OF_POINTER_TO_STRUCT(css, ChannelSubSys, MAX_CSSID + 1,
346 0, vmstate_css_img, CssImage),
347 VMSTATE_UINT8(default_cssid, ChannelSubSys),
348 VMSTATE_END_OF_LIST()
349 }
350 };
351
352 static ChannelSubSys channel_subsys = {
353 .pending_crws = QTAILQ_HEAD_INITIALIZER(channel_subsys.pending_crws),
354 .do_crw_mchk = true,
355 .sei_pending = false,
356 .crws_lost = false,
357 .chnmon_active = false,
358 .indicator_addresses =
359 QTAILQ_HEAD_INITIALIZER(channel_subsys.indicator_addresses),
360 };
361
362 static int subch_dev_pre_save(void *opaque)
363 {
364 SubchDev *s = opaque;
365
366 /* Prepare remote_schid for save */
367 s->migrated_schid = s->schid;
368
369 return 0;
370 }
371
372 static int subch_dev_post_load(void *opaque, int version_id)
373 {
374
375 SubchDev *s = opaque;
376
377 /* Re-assign the subchannel to remote_schid if necessary */
378 if (s->migrated_schid != s->schid) {
379 if (css_find_subch(true, s->cssid, s->ssid, s->schid) == s) {
380 /*
381 * Cleanup the slot before moving to s->migrated_schid provided
382 * it still belongs to us, i.e. it was not changed by previous
383 * invocation of this function.
384 */
385 css_subch_assign(s->cssid, s->ssid, s->schid, s->devno, NULL);
386 }
387 /* It's OK to re-assign without a prior de-assign. */
388 s->schid = s->migrated_schid;
389 css_subch_assign(s->cssid, s->ssid, s->schid, s->devno, s);
390 }
391
392 if (css_migration_enabled()) {
393 /* No compat voodoo to do ;) */
394 return 0;
395 }
396 /*
397 * Hack alert. If we don't migrate the channel subsystem status
398 * we still need to find out if the guest enabled mss/mcss-e.
399 * If the subchannel is enabled, it certainly was able to access it,
400 * so adjust the max_ssid/max_cssid values for relevant ssid/cssid
401 * values. This is not watertight, but better than nothing.
402 */
403 if (s->curr_status.pmcw.flags & PMCW_FLAGS_MASK_ENA) {
404 if (s->ssid) {
405 channel_subsys.max_ssid = MAX_SSID;
406 }
407 if (s->cssid != channel_subsys.default_cssid) {
408 channel_subsys.max_cssid = MAX_CSSID;
409 }
410 }
411 return 0;
412 }
413
414 void css_register_vmstate(void)
415 {
416 vmstate_register(NULL, 0, &vmstate_css, &channel_subsys);
417 }
418
419 IndAddr *get_indicator(hwaddr ind_addr, int len)
420 {
421 IndAddr *indicator;
422
423 QTAILQ_FOREACH(indicator, &channel_subsys.indicator_addresses, sibling) {
424 if (indicator->addr == ind_addr) {
425 indicator->refcnt++;
426 return indicator;
427 }
428 }
429 indicator = g_new0(IndAddr, 1);
430 indicator->addr = ind_addr;
431 indicator->len = len;
432 indicator->refcnt = 1;
433 QTAILQ_INSERT_TAIL(&channel_subsys.indicator_addresses,
434 indicator, sibling);
435 return indicator;
436 }
437
438 static int s390_io_adapter_map(AdapterInfo *adapter, uint64_t map_addr,
439 bool do_map)
440 {
441 S390FLICState *fs = s390_get_flic();
442 S390FLICStateClass *fsc = s390_get_flic_class(fs);
443
444 return fsc->io_adapter_map(fs, adapter->adapter_id, map_addr, do_map);
445 }
446
447 void release_indicator(AdapterInfo *adapter, IndAddr *indicator)
448 {
449 assert(indicator->refcnt > 0);
450 indicator->refcnt--;
451 if (indicator->refcnt > 0) {
452 return;
453 }
454 QTAILQ_REMOVE(&channel_subsys.indicator_addresses, indicator, sibling);
455 if (indicator->map) {
456 s390_io_adapter_map(adapter, indicator->map, false);
457 }
458 g_free(indicator);
459 }
460
461 int map_indicator(AdapterInfo *adapter, IndAddr *indicator)
462 {
463 int ret;
464
465 if (indicator->map) {
466 return 0; /* already mapped is not an error */
467 }
468 indicator->map = indicator->addr;
469 ret = s390_io_adapter_map(adapter, indicator->map, true);
470 if ((ret != 0) && (ret != -ENOSYS)) {
471 goto out_err;
472 }
473 return 0;
474
475 out_err:
476 indicator->map = 0;
477 return ret;
478 }
479
480 int css_create_css_image(uint8_t cssid, bool default_image)
481 {
482 trace_css_new_image(cssid, default_image ? "(default)" : "");
483 /* 255 is reserved */
484 if (cssid == 255) {
485 return -EINVAL;
486 }
487 if (channel_subsys.css[cssid]) {
488 return -EBUSY;
489 }
490 channel_subsys.css[cssid] = g_new0(CssImage, 1);
491 if (default_image) {
492 channel_subsys.default_cssid = cssid;
493 }
494 return 0;
495 }
496
497 uint32_t css_get_adapter_id(CssIoAdapterType type, uint8_t isc)
498 {
499 if (type >= CSS_IO_ADAPTER_TYPE_NUMS || isc > MAX_ISC ||
500 !channel_subsys.io_adapters[type][isc]) {
501 return -1;
502 }
503
504 return channel_subsys.io_adapters[type][isc]->id;
505 }
506
507 /**
508 * css_register_io_adapters: Register I/O adapters per ISC during init
509 *
510 * @swap: an indication if byte swap is needed.
511 * @maskable: an indication if the adapter is subject to the mask operation.
512 * @flags: further characteristics of the adapter.
513 * e.g. suppressible, an indication if the adapter is subject to AIS.
514 * @errp: location to store error information.
515 */
516 void css_register_io_adapters(CssIoAdapterType type, bool swap, bool maskable,
517 uint8_t flags, Error **errp)
518 {
519 uint32_t id;
520 int ret, isc;
521 IoAdapter *adapter;
522 S390FLICState *fs = s390_get_flic();
523 S390FLICStateClass *fsc = s390_get_flic_class(fs);
524
525 /*
526 * Disallow multiple registrations for the same device type.
527 * Report an error if registering for an already registered type.
528 */
529 if (channel_subsys.io_adapters[type][0]) {
530 error_setg(errp, "Adapters for type %d already registered", type);
531 }
532
533 for (isc = 0; isc <= MAX_ISC; isc++) {
534 id = (type << 3) | isc;
535 ret = fsc->register_io_adapter(fs, id, isc, swap, maskable, flags);
536 if (ret == 0) {
537 adapter = g_new0(IoAdapter, 1);
538 adapter->id = id;
539 adapter->isc = isc;
540 adapter->type = type;
541 adapter->flags = flags;
542 channel_subsys.io_adapters[type][isc] = adapter;
543 } else {
544 error_setg_errno(errp, -ret, "Unexpected error %d when "
545 "registering adapter %d", ret, id);
546 break;
547 }
548 }
549
550 /*
551 * No need to free registered adapters in kvm: kvm will clean up
552 * when the machine goes away.
553 */
554 if (ret) {
555 for (isc--; isc >= 0; isc--) {
556 g_free(channel_subsys.io_adapters[type][isc]);
557 channel_subsys.io_adapters[type][isc] = NULL;
558 }
559 }
560
561 }
562
563 static void css_clear_io_interrupt(uint16_t subchannel_id,
564 uint16_t subchannel_nr)
565 {
566 Error *err = NULL;
567 static bool no_clear_irq;
568 S390FLICState *fs = s390_get_flic();
569 S390FLICStateClass *fsc = s390_get_flic_class(fs);
570 int r;
571
572 if (unlikely(no_clear_irq)) {
573 return;
574 }
575 r = fsc->clear_io_irq(fs, subchannel_id, subchannel_nr);
576 switch (r) {
577 case 0:
578 break;
579 case -ENOSYS:
580 no_clear_irq = true;
581 /*
582 * Ignore unavailability, as the user can't do anything
583 * about it anyway.
584 */
585 break;
586 default:
587 error_setg_errno(&err, -r, "unexpected error condition");
588 error_propagate(&error_abort, err);
589 }
590 }
591
592 static inline uint16_t css_do_build_subchannel_id(uint8_t cssid, uint8_t ssid)
593 {
594 if (channel_subsys.max_cssid > 0) {
595 return (cssid << 8) | (1 << 3) | (ssid << 1) | 1;
596 }
597 return (ssid << 1) | 1;
598 }
599
600 uint16_t css_build_subchannel_id(SubchDev *sch)
601 {
602 return css_do_build_subchannel_id(sch->cssid, sch->ssid);
603 }
604
605 void css_inject_io_interrupt(SubchDev *sch)
606 {
607 uint8_t isc = (sch->curr_status.pmcw.flags & PMCW_FLAGS_MASK_ISC) >> 11;
608
609 trace_css_io_interrupt(sch->cssid, sch->ssid, sch->schid,
610 sch->curr_status.pmcw.intparm, isc, "");
611 s390_io_interrupt(css_build_subchannel_id(sch),
612 sch->schid,
613 sch->curr_status.pmcw.intparm,
614 isc << 27);
615 }
616
617 void css_conditional_io_interrupt(SubchDev *sch)
618 {
619 /*
620 * If the subchannel is not enabled, it is not made status pending
621 * (see PoP p. 16-17, "Status Control").
622 */
623 if (!(sch->curr_status.pmcw.flags & PMCW_FLAGS_MASK_ENA)) {
624 return;
625 }
626
627 /*
628 * If the subchannel is not currently status pending, make it pending
629 * with alert status.
630 */
631 if (!(sch->curr_status.scsw.ctrl & SCSW_STCTL_STATUS_PEND)) {
632 uint8_t isc = (sch->curr_status.pmcw.flags & PMCW_FLAGS_MASK_ISC) >> 11;
633
634 trace_css_io_interrupt(sch->cssid, sch->ssid, sch->schid,
635 sch->curr_status.pmcw.intparm, isc,
636 "(unsolicited)");
637 sch->curr_status.scsw.ctrl &= ~SCSW_CTRL_MASK_STCTL;
638 sch->curr_status.scsw.ctrl |=
639 SCSW_STCTL_ALERT | SCSW_STCTL_STATUS_PEND;
640 /* Inject an I/O interrupt. */
641 s390_io_interrupt(css_build_subchannel_id(sch),
642 sch->schid,
643 sch->curr_status.pmcw.intparm,
644 isc << 27);
645 }
646 }
647
648 int css_do_sic(CPUS390XState *env, uint8_t isc, uint16_t mode)
649 {
650 S390FLICState *fs = s390_get_flic();
651 S390FLICStateClass *fsc = s390_get_flic_class(fs);
652 int r;
653
654 if (env->psw.mask & PSW_MASK_PSTATE) {
655 r = -PGM_PRIVILEGED;
656 goto out;
657 }
658
659 trace_css_do_sic(mode, isc);
660 switch (mode) {
661 case SIC_IRQ_MODE_ALL:
662 case SIC_IRQ_MODE_SINGLE:
663 break;
664 default:
665 r = -PGM_OPERAND;
666 goto out;
667 }
668
669 r = fsc->modify_ais_mode(fs, isc, mode) ? -PGM_OPERATION : 0;
670 out:
671 return r;
672 }
673
674 void css_adapter_interrupt(CssIoAdapterType type, uint8_t isc)
675 {
676 S390FLICState *fs = s390_get_flic();
677 S390FLICStateClass *fsc = s390_get_flic_class(fs);
678 uint32_t io_int_word = (isc << 27) | IO_INT_WORD_AI;
679 IoAdapter *adapter = channel_subsys.io_adapters[type][isc];
680
681 if (!adapter) {
682 return;
683 }
684
685 trace_css_adapter_interrupt(isc);
686 if (fs->ais_supported) {
687 if (fsc->inject_airq(fs, type, isc, adapter->flags)) {
688 error_report("Failed to inject airq with AIS supported");
689 exit(1);
690 }
691 } else {
692 s390_io_interrupt(0, 0, 0, io_int_word);
693 }
694 }
695
696 static void sch_handle_clear_func(SubchDev *sch)
697 {
698 SCHIB *schib = &sch->curr_status;
699 int path;
700
701 /* Path management: In our simple css, we always choose the only path. */
702 path = 0x80;
703
704 /* Reset values prior to 'issuing the clear signal'. */
705 schib->pmcw.lpum = 0;
706 schib->pmcw.pom = 0xff;
707 schib->scsw.flags &= ~SCSW_FLAGS_MASK_PNO;
708
709 /* We always 'attempt to issue the clear signal', and we always succeed. */
710 sch->channel_prog = 0x0;
711 sch->last_cmd_valid = false;
712 schib->scsw.ctrl &= ~SCSW_ACTL_CLEAR_PEND;
713 schib->scsw.ctrl |= SCSW_STCTL_STATUS_PEND;
714
715 schib->scsw.dstat = 0;
716 schib->scsw.cstat = 0;
717 schib->pmcw.lpum = path;
718
719 }
720
721 static void sch_handle_halt_func(SubchDev *sch)
722 {
723 SCHIB *schib = &sch->curr_status;
724 hwaddr curr_ccw = sch->channel_prog;
725 int path;
726
727 /* Path management: In our simple css, we always choose the only path. */
728 path = 0x80;
729
730 /* We always 'attempt to issue the halt signal', and we always succeed. */
731 sch->channel_prog = 0x0;
732 sch->last_cmd_valid = false;
733 schib->scsw.ctrl &= ~SCSW_ACTL_HALT_PEND;
734 schib->scsw.ctrl |= SCSW_STCTL_STATUS_PEND;
735
736 if ((schib->scsw.ctrl & (SCSW_ACTL_SUBCH_ACTIVE |
737 SCSW_ACTL_DEVICE_ACTIVE)) ||
738 !((schib->scsw.ctrl & SCSW_ACTL_START_PEND) ||
739 (schib->scsw.ctrl & SCSW_ACTL_SUSP))) {
740 schib->scsw.dstat = SCSW_DSTAT_DEVICE_END;
741 }
742 if ((schib->scsw.ctrl & (SCSW_ACTL_SUBCH_ACTIVE |
743 SCSW_ACTL_DEVICE_ACTIVE)) ||
744 (schib->scsw.ctrl & SCSW_ACTL_SUSP)) {
745 schib->scsw.cpa = curr_ccw + 8;
746 }
747 schib->scsw.cstat = 0;
748 schib->pmcw.lpum = path;
749
750 }
751
752 /*
753 * As the SenseId struct cannot be packed (would cause unaligned accesses), we
754 * have to copy the individual fields to an unstructured area using the correct
755 * layout (see SA22-7204-01 "Common I/O-Device Commands").
756 */
757 static void copy_sense_id_to_guest(uint8_t *dest, SenseId *src)
758 {
759 int i;
760
761 dest[0] = src->reserved;
762 stw_be_p(dest + 1, src->cu_type);
763 dest[3] = src->cu_model;
764 stw_be_p(dest + 4, src->dev_type);
765 dest[6] = src->dev_model;
766 dest[7] = src->unused;
767 for (i = 0; i < ARRAY_SIZE(src->ciw); i++) {
768 dest[8 + i * 4] = src->ciw[i].type;
769 dest[9 + i * 4] = src->ciw[i].command;
770 stw_be_p(dest + 10 + i * 4, src->ciw[i].count);
771 }
772 }
773
774 static CCW1 copy_ccw_from_guest(hwaddr addr, bool fmt1)
775 {
776 CCW0 tmp0;
777 CCW1 tmp1;
778 CCW1 ret;
779
780 if (fmt1) {
781 cpu_physical_memory_read(addr, &tmp1, sizeof(tmp1));
782 ret.cmd_code = tmp1.cmd_code;
783 ret.flags = tmp1.flags;
784 ret.count = be16_to_cpu(tmp1.count);
785 ret.cda = be32_to_cpu(tmp1.cda);
786 } else {
787 cpu_physical_memory_read(addr, &tmp0, sizeof(tmp0));
788 if ((tmp0.cmd_code & 0x0f) == CCW_CMD_TIC) {
789 ret.cmd_code = CCW_CMD_TIC;
790 ret.flags = 0;
791 ret.count = 0;
792 } else {
793 ret.cmd_code = tmp0.cmd_code;
794 ret.flags = tmp0.flags;
795 ret.count = be16_to_cpu(tmp0.count);
796 }
797 ret.cda = be16_to_cpu(tmp0.cda1) | (tmp0.cda0 << 16);
798 }
799 return ret;
800 }
801 /**
802 * If out of bounds marks the stream broken. If broken returns -EINVAL,
803 * otherwise the requested length (may be zero)
804 */
805 static inline int cds_check_len(CcwDataStream *cds, int len)
806 {
807 if (cds->at_byte + len > cds->count) {
808 cds->flags |= CDS_F_STREAM_BROKEN;
809 }
810 return cds->flags & CDS_F_STREAM_BROKEN ? -EINVAL : len;
811 }
812
813 static inline bool cds_ccw_addrs_ok(hwaddr addr, int len, bool ccw_fmt1)
814 {
815 return (addr + len) < (ccw_fmt1 ? (1UL << 31) : (1UL << 24));
816 }
817
818 static int ccw_dstream_rw_noflags(CcwDataStream *cds, void *buff, int len,
819 CcwDataStreamOp op)
820 {
821 int ret;
822
823 ret = cds_check_len(cds, len);
824 if (ret <= 0) {
825 return ret;
826 }
827 if (!cds_ccw_addrs_ok(cds->cda, len, cds->flags & CDS_F_FMT)) {
828 return -EINVAL; /* channel program check */
829 }
830 if (op == CDS_OP_A) {
831 goto incr;
832 }
833 if (!cds->do_skip) {
834 ret = address_space_rw(&address_space_memory, cds->cda,
835 MEMTXATTRS_UNSPECIFIED, buff, len, op);
836 } else {
837 ret = MEMTX_OK;
838 }
839 if (ret != MEMTX_OK) {
840 cds->flags |= CDS_F_STREAM_BROKEN;
841 return -EINVAL;
842 }
843 incr:
844 cds->at_byte += len;
845 cds->cda += len;
846 return 0;
847 }
848
849 /* returns values between 1 and bsz, where bsz is a power of 2 */
850 static inline uint16_t ida_continuous_left(hwaddr cda, uint64_t bsz)
851 {
852 return bsz - (cda & (bsz - 1));
853 }
854
855 static inline uint64_t ccw_ida_block_size(uint8_t flags)
856 {
857 if ((flags & CDS_F_C64) && !(flags & CDS_F_I2K)) {
858 return 1ULL << 12;
859 }
860 return 1ULL << 11;
861 }
862
863 static inline int ida_read_next_idaw(CcwDataStream *cds)
864 {
865 union {uint64_t fmt2; uint32_t fmt1; } idaw;
866 int ret;
867 hwaddr idaw_addr;
868 bool idaw_fmt2 = cds->flags & CDS_F_C64;
869 bool ccw_fmt1 = cds->flags & CDS_F_FMT;
870
871 if (idaw_fmt2) {
872 idaw_addr = cds->cda_orig + sizeof(idaw.fmt2) * cds->at_idaw;
873 if (idaw_addr & 0x07 || !cds_ccw_addrs_ok(idaw_addr, 0, ccw_fmt1)) {
874 return -EINVAL; /* channel program check */
875 }
876 ret = address_space_read(&address_space_memory, idaw_addr,
877 MEMTXATTRS_UNSPECIFIED, &idaw.fmt2,
878 sizeof(idaw.fmt2));
879 cds->cda = be64_to_cpu(idaw.fmt2);
880 } else {
881 idaw_addr = cds->cda_orig + sizeof(idaw.fmt1) * cds->at_idaw;
882 if (idaw_addr & 0x03 || !cds_ccw_addrs_ok(idaw_addr, 0, ccw_fmt1)) {
883 return -EINVAL; /* channel program check */
884 }
885 ret = address_space_read(&address_space_memory, idaw_addr,
886 MEMTXATTRS_UNSPECIFIED, &idaw.fmt1,
887 sizeof(idaw.fmt1));
888 cds->cda = be64_to_cpu(idaw.fmt1);
889 if (cds->cda & 0x80000000) {
890 return -EINVAL; /* channel program check */
891 }
892 }
893 ++(cds->at_idaw);
894 if (ret != MEMTX_OK) {
895 /* assume inaccessible address */
896 return -EINVAL; /* channel program check */
897 }
898 return 0;
899 }
900
901 static int ccw_dstream_rw_ida(CcwDataStream *cds, void *buff, int len,
902 CcwDataStreamOp op)
903 {
904 uint64_t bsz = ccw_ida_block_size(cds->flags);
905 int ret = 0;
906 uint16_t cont_left, iter_len;
907
908 ret = cds_check_len(cds, len);
909 if (ret <= 0) {
910 return ret;
911 }
912 if (!cds->at_idaw) {
913 /* read first idaw */
914 ret = ida_read_next_idaw(cds);
915 if (ret) {
916 goto err;
917 }
918 cont_left = ida_continuous_left(cds->cda, bsz);
919 } else {
920 cont_left = ida_continuous_left(cds->cda, bsz);
921 if (cont_left == bsz) {
922 ret = ida_read_next_idaw(cds);
923 if (ret) {
924 goto err;
925 }
926 if (cds->cda & (bsz - 1)) {
927 ret = -EINVAL; /* channel program check */
928 goto err;
929 }
930 }
931 }
932 do {
933 iter_len = MIN(len, cont_left);
934 if (op != CDS_OP_A) {
935 if (!cds->do_skip) {
936 ret = address_space_rw(&address_space_memory, cds->cda,
937 MEMTXATTRS_UNSPECIFIED, buff, iter_len,
938 op);
939 } else {
940 ret = MEMTX_OK;
941 }
942 if (ret != MEMTX_OK) {
943 /* assume inaccessible address */
944 ret = -EINVAL; /* channel program check */
945 goto err;
946 }
947 }
948 cds->at_byte += iter_len;
949 cds->cda += iter_len;
950 len -= iter_len;
951 if (!len) {
952 break;
953 }
954 ret = ida_read_next_idaw(cds);
955 if (ret) {
956 goto err;
957 }
958 cont_left = bsz;
959 } while (true);
960 return ret;
961 err:
962 cds->flags |= CDS_F_STREAM_BROKEN;
963 return ret;
964 }
965
966 void ccw_dstream_init(CcwDataStream *cds, CCW1 const *ccw, ORB const *orb)
967 {
968 /*
969 * We don't support MIDA (an optional facility) yet and we
970 * catch this earlier. Just for expressing the precondition.
971 */
972 g_assert(!(orb->ctrl1 & ORB_CTRL1_MASK_MIDAW));
973 cds->flags = (orb->ctrl0 & ORB_CTRL0_MASK_I2K ? CDS_F_I2K : 0) |
974 (orb->ctrl0 & ORB_CTRL0_MASK_C64 ? CDS_F_C64 : 0) |
975 (orb->ctrl0 & ORB_CTRL0_MASK_FMT ? CDS_F_FMT : 0) |
976 (ccw->flags & CCW_FLAG_IDA ? CDS_F_IDA : 0);
977
978 cds->count = ccw->count;
979 cds->cda_orig = ccw->cda;
980 /* skip is only effective for read, read backwards, or sense commands */
981 cds->do_skip = (ccw->flags & CCW_FLAG_SKIP) &&
982 ((ccw->cmd_code & 0x0f) == CCW_CMD_BASIC_SENSE ||
983 (ccw->cmd_code & 0x03) == 0x02 /* read */ ||
984 (ccw->cmd_code & 0x0f) == 0x0c /* read backwards */);
985 ccw_dstream_rewind(cds);
986 if (!(cds->flags & CDS_F_IDA)) {
987 cds->op_handler = ccw_dstream_rw_noflags;
988 } else {
989 cds->op_handler = ccw_dstream_rw_ida;
990 }
991 }
992
993 static int css_interpret_ccw(SubchDev *sch, hwaddr ccw_addr,
994 bool suspend_allowed)
995 {
996 int ret;
997 bool check_len;
998 int len;
999 CCW1 ccw;
1000
1001 if (!ccw_addr) {
1002 return -EINVAL; /* channel-program check */
1003 }
1004 /* Check doubleword aligned and 31 or 24 (fmt 0) bit addressable. */
1005 if (ccw_addr & (sch->ccw_fmt_1 ? 0x80000007 : 0xff000007)) {
1006 return -EINVAL;
1007 }
1008
1009 /* Translate everything to format-1 ccws - the information is the same. */
1010 ccw = copy_ccw_from_guest(ccw_addr, sch->ccw_fmt_1);
1011
1012 /* Check for invalid command codes. */
1013 if ((ccw.cmd_code & 0x0f) == 0) {
1014 return -EINVAL;
1015 }
1016 if (((ccw.cmd_code & 0x0f) == CCW_CMD_TIC) &&
1017 ((ccw.cmd_code & 0xf0) != 0)) {
1018 return -EINVAL;
1019 }
1020 if (!sch->ccw_fmt_1 && (ccw.count == 0) &&
1021 (ccw.cmd_code != CCW_CMD_TIC)) {
1022 return -EINVAL;
1023 }
1024
1025 /* We don't support MIDA. */
1026 if (ccw.flags & CCW_FLAG_MIDA) {
1027 return -EINVAL;
1028 }
1029
1030 if (ccw.flags & CCW_FLAG_SUSPEND) {
1031 return suspend_allowed ? -EINPROGRESS : -EINVAL;
1032 }
1033
1034 check_len = !((ccw.flags & CCW_FLAG_SLI) && !(ccw.flags & CCW_FLAG_DC));
1035
1036 if (!ccw.cda) {
1037 if (sch->ccw_no_data_cnt == 255) {
1038 return -EINVAL;
1039 }
1040 sch->ccw_no_data_cnt++;
1041 }
1042
1043 /* Look at the command. */
1044 ccw_dstream_init(&sch->cds, &ccw, &(sch->orb));
1045 switch (ccw.cmd_code) {
1046 case CCW_CMD_NOOP:
1047 /* Nothing to do. */
1048 ret = 0;
1049 break;
1050 case CCW_CMD_BASIC_SENSE:
1051 if (check_len) {
1052 if (ccw.count != sizeof(sch->sense_data)) {
1053 ret = -EINVAL;
1054 break;
1055 }
1056 }
1057 len = MIN(ccw.count, sizeof(sch->sense_data));
1058 ccw_dstream_write_buf(&sch->cds, sch->sense_data, len);
1059 sch->curr_status.scsw.count = ccw_dstream_residual_count(&sch->cds);
1060 memset(sch->sense_data, 0, sizeof(sch->sense_data));
1061 ret = 0;
1062 break;
1063 case CCW_CMD_SENSE_ID:
1064 {
1065 /* According to SA22-7204-01, Sense-ID can store up to 256 bytes */
1066 uint8_t sense_id[256];
1067
1068 copy_sense_id_to_guest(sense_id, &sch->id);
1069 /* Sense ID information is device specific. */
1070 if (check_len) {
1071 if (ccw.count != sizeof(sense_id)) {
1072 ret = -EINVAL;
1073 break;
1074 }
1075 }
1076 len = MIN(ccw.count, sizeof(sense_id));
1077 /*
1078 * Only indicate 0xff in the first sense byte if we actually
1079 * have enough place to store at least bytes 0-3.
1080 */
1081 if (len >= 4) {
1082 sense_id[0] = 0xff;
1083 } else {
1084 sense_id[0] = 0;
1085 }
1086 ccw_dstream_write_buf(&sch->cds, sense_id, len);
1087 sch->curr_status.scsw.count = ccw_dstream_residual_count(&sch->cds);
1088 ret = 0;
1089 break;
1090 }
1091 case CCW_CMD_TIC:
1092 if (sch->last_cmd_valid && (sch->last_cmd.cmd_code == CCW_CMD_TIC)) {
1093 ret = -EINVAL;
1094 break;
1095 }
1096 if (ccw.flags || ccw.count) {
1097 /* We have already sanitized these if converted from fmt 0. */
1098 ret = -EINVAL;
1099 break;
1100 }
1101 sch->channel_prog = ccw.cda;
1102 ret = -EAGAIN;
1103 break;
1104 default:
1105 if (sch->ccw_cb) {
1106 /* Handle device specific commands. */
1107 ret = sch->ccw_cb(sch, ccw);
1108 } else {
1109 ret = -ENOSYS;
1110 }
1111 break;
1112 }
1113 sch->last_cmd = ccw;
1114 sch->last_cmd_valid = true;
1115 if (ret == 0) {
1116 if (ccw.flags & CCW_FLAG_CC) {
1117 sch->channel_prog += 8;
1118 ret = -EAGAIN;
1119 }
1120 }
1121
1122 return ret;
1123 }
1124
1125 static void sch_handle_start_func_virtual(SubchDev *sch)
1126 {
1127 SCHIB *schib = &sch->curr_status;
1128 int path;
1129 int ret;
1130 bool suspend_allowed;
1131
1132 /* Path management: In our simple css, we always choose the only path. */
1133 path = 0x80;
1134
1135 if (!(schib->scsw.ctrl & SCSW_ACTL_SUSP)) {
1136 /* Start Function triggered via ssch, i.e. we have an ORB */
1137 ORB *orb = &sch->orb;
1138 schib->scsw.cstat = 0;
1139 schib->scsw.dstat = 0;
1140 /* Look at the orb and try to execute the channel program. */
1141 schib->pmcw.intparm = orb->intparm;
1142 if (!(orb->lpm & path)) {
1143 /* Generate a deferred cc 3 condition. */
1144 schib->scsw.flags |= SCSW_FLAGS_MASK_CC;
1145 schib->scsw.ctrl &= ~SCSW_CTRL_MASK_STCTL;
1146 schib->scsw.ctrl |= (SCSW_STCTL_ALERT | SCSW_STCTL_STATUS_PEND);
1147 return;
1148 }
1149 sch->ccw_fmt_1 = !!(orb->ctrl0 & ORB_CTRL0_MASK_FMT);
1150 schib->scsw.flags |= (sch->ccw_fmt_1) ? SCSW_FLAGS_MASK_FMT : 0;
1151 sch->ccw_no_data_cnt = 0;
1152 suspend_allowed = !!(orb->ctrl0 & ORB_CTRL0_MASK_SPND);
1153 } else {
1154 /* Start Function resumed via rsch */
1155 schib->scsw.ctrl &= ~(SCSW_ACTL_SUSP | SCSW_ACTL_RESUME_PEND);
1156 /* The channel program had been suspended before. */
1157 suspend_allowed = true;
1158 }
1159 sch->last_cmd_valid = false;
1160 do {
1161 ret = css_interpret_ccw(sch, sch->channel_prog, suspend_allowed);
1162 switch (ret) {
1163 case -EAGAIN:
1164 /* ccw chain, continue processing */
1165 break;
1166 case 0:
1167 /* success */
1168 schib->scsw.ctrl &= ~SCSW_ACTL_START_PEND;
1169 schib->scsw.ctrl &= ~SCSW_CTRL_MASK_STCTL;
1170 schib->scsw.ctrl |= SCSW_STCTL_PRIMARY | SCSW_STCTL_SECONDARY |
1171 SCSW_STCTL_STATUS_PEND;
1172 schib->scsw.dstat = SCSW_DSTAT_CHANNEL_END | SCSW_DSTAT_DEVICE_END;
1173 schib->scsw.cpa = sch->channel_prog + 8;
1174 break;
1175 case -EIO:
1176 /* I/O errors, status depends on specific devices */
1177 break;
1178 case -ENOSYS:
1179 /* unsupported command, generate unit check (command reject) */
1180 schib->scsw.ctrl &= ~SCSW_ACTL_START_PEND;
1181 schib->scsw.dstat = SCSW_DSTAT_UNIT_CHECK;
1182 /* Set sense bit 0 in ecw0. */
1183 sch->sense_data[0] = 0x80;
1184 schib->scsw.ctrl &= ~SCSW_CTRL_MASK_STCTL;
1185 schib->scsw.ctrl |= SCSW_STCTL_PRIMARY | SCSW_STCTL_SECONDARY |
1186 SCSW_STCTL_ALERT | SCSW_STCTL_STATUS_PEND;
1187 schib->scsw.cpa = sch->channel_prog + 8;
1188 break;
1189 case -EINPROGRESS:
1190 /* channel program has been suspended */
1191 schib->scsw.ctrl &= ~SCSW_ACTL_START_PEND;
1192 schib->scsw.ctrl |= SCSW_ACTL_SUSP;
1193 break;
1194 default:
1195 /* error, generate channel program check */
1196 schib->scsw.ctrl &= ~SCSW_ACTL_START_PEND;
1197 schib->scsw.cstat = SCSW_CSTAT_PROG_CHECK;
1198 schib->scsw.ctrl &= ~SCSW_CTRL_MASK_STCTL;
1199 schib->scsw.ctrl |= SCSW_STCTL_PRIMARY | SCSW_STCTL_SECONDARY |
1200 SCSW_STCTL_ALERT | SCSW_STCTL_STATUS_PEND;
1201 schib->scsw.cpa = sch->channel_prog + 8;
1202 break;
1203 }
1204 } while (ret == -EAGAIN);
1205
1206 }
1207
1208 static void sch_handle_halt_func_passthrough(SubchDev *sch)
1209 {
1210 int ret;
1211
1212 ret = s390_ccw_halt(sch);
1213 if (ret == -ENOSYS) {
1214 sch_handle_halt_func(sch);
1215 }
1216 }
1217
1218 static void sch_handle_clear_func_passthrough(SubchDev *sch)
1219 {
1220 int ret;
1221
1222 ret = s390_ccw_clear(sch);
1223 if (ret == -ENOSYS) {
1224 sch_handle_clear_func(sch);
1225 }
1226 }
1227
1228 static IOInstEnding sch_handle_start_func_passthrough(SubchDev *sch)
1229 {
1230 SCHIB *schib = &sch->curr_status;
1231 ORB *orb = &sch->orb;
1232 if (!(schib->scsw.ctrl & SCSW_ACTL_SUSP)) {
1233 assert(orb != NULL);
1234 schib->pmcw.intparm = orb->intparm;
1235 }
1236 return s390_ccw_cmd_request(sch);
1237 }
1238
1239 /*
1240 * On real machines, this would run asynchronously to the main vcpus.
1241 * We might want to make some parts of the ssch handling (interpreting
1242 * read/writes) asynchronous later on if we start supporting more than
1243 * our current very simple devices.
1244 */
1245 IOInstEnding do_subchannel_work_virtual(SubchDev *sch)
1246 {
1247 SCHIB *schib = &sch->curr_status;
1248
1249 if (schib->scsw.ctrl & SCSW_FCTL_CLEAR_FUNC) {
1250 sch_handle_clear_func(sch);
1251 } else if (schib->scsw.ctrl & SCSW_FCTL_HALT_FUNC) {
1252 sch_handle_halt_func(sch);
1253 } else if (schib->scsw.ctrl & SCSW_FCTL_START_FUNC) {
1254 /* Triggered by both ssch and rsch. */
1255 sch_handle_start_func_virtual(sch);
1256 }
1257 css_inject_io_interrupt(sch);
1258 /* inst must succeed if this func is called */
1259 return IOINST_CC_EXPECTED;
1260 }
1261
1262 IOInstEnding do_subchannel_work_passthrough(SubchDev *sch)
1263 {
1264 SCHIB *schib = &sch->curr_status;
1265
1266 if (schib->scsw.ctrl & SCSW_FCTL_CLEAR_FUNC) {
1267 sch_handle_clear_func_passthrough(sch);
1268 } else if (schib->scsw.ctrl & SCSW_FCTL_HALT_FUNC) {
1269 sch_handle_halt_func_passthrough(sch);
1270 } else if (schib->scsw.ctrl & SCSW_FCTL_START_FUNC) {
1271 return sch_handle_start_func_passthrough(sch);
1272 }
1273 return IOINST_CC_EXPECTED;
1274 }
1275
1276 static IOInstEnding do_subchannel_work(SubchDev *sch)
1277 {
1278 if (!sch->do_subchannel_work) {
1279 return IOINST_CC_STATUS_PRESENT;
1280 }
1281 g_assert(sch->curr_status.scsw.ctrl & SCSW_CTRL_MASK_FCTL);
1282 return sch->do_subchannel_work(sch);
1283 }
1284
1285 static void copy_pmcw_to_guest(PMCW *dest, const PMCW *src)
1286 {
1287 int i;
1288
1289 dest->intparm = cpu_to_be32(src->intparm);
1290 dest->flags = cpu_to_be16(src->flags);
1291 dest->devno = cpu_to_be16(src->devno);
1292 dest->lpm = src->lpm;
1293 dest->pnom = src->pnom;
1294 dest->lpum = src->lpum;
1295 dest->pim = src->pim;
1296 dest->mbi = cpu_to_be16(src->mbi);
1297 dest->pom = src->pom;
1298 dest->pam = src->pam;
1299 for (i = 0; i < ARRAY_SIZE(dest->chpid); i++) {
1300 dest->chpid[i] = src->chpid[i];
1301 }
1302 dest->chars = cpu_to_be32(src->chars);
1303 }
1304
1305 void copy_scsw_to_guest(SCSW *dest, const SCSW *src)
1306 {
1307 dest->flags = cpu_to_be16(src->flags);
1308 dest->ctrl = cpu_to_be16(src->ctrl);
1309 dest->cpa = cpu_to_be32(src->cpa);
1310 dest->dstat = src->dstat;
1311 dest->cstat = src->cstat;
1312 dest->count = cpu_to_be16(src->count);
1313 }
1314
1315 static void copy_schib_to_guest(SCHIB *dest, const SCHIB *src)
1316 {
1317 int i;
1318 /*
1319 * We copy the PMCW and SCSW in and out of local variables to
1320 * avoid taking the address of members of a packed struct.
1321 */
1322 PMCW src_pmcw, dest_pmcw;
1323 SCSW src_scsw, dest_scsw;
1324
1325 src_pmcw = src->pmcw;
1326 copy_pmcw_to_guest(&dest_pmcw, &src_pmcw);
1327 dest->pmcw = dest_pmcw;
1328 src_scsw = src->scsw;
1329 copy_scsw_to_guest(&dest_scsw, &src_scsw);
1330 dest->scsw = dest_scsw;
1331 dest->mba = cpu_to_be64(src->mba);
1332 for (i = 0; i < ARRAY_SIZE(dest->mda); i++) {
1333 dest->mda[i] = src->mda[i];
1334 }
1335 }
1336
1337 IOInstEnding css_do_stsch(SubchDev *sch, SCHIB *schib)
1338 {
1339 int ret;
1340
1341 /*
1342 * For some subchannels, we may want to update parts of
1343 * the schib (e.g., update path masks from the host device
1344 * for passthrough subchannels).
1345 */
1346 ret = s390_ccw_store(sch);
1347
1348 /* Use current status. */
1349 copy_schib_to_guest(schib, &sch->curr_status);
1350 return ret;
1351 }
1352
1353 static void copy_pmcw_from_guest(PMCW *dest, const PMCW *src)
1354 {
1355 int i;
1356
1357 dest->intparm = be32_to_cpu(src->intparm);
1358 dest->flags = be16_to_cpu(src->flags);
1359 dest->devno = be16_to_cpu(src->devno);
1360 dest->lpm = src->lpm;
1361 dest->pnom = src->pnom;
1362 dest->lpum = src->lpum;
1363 dest->pim = src->pim;
1364 dest->mbi = be16_to_cpu(src->mbi);
1365 dest->pom = src->pom;
1366 dest->pam = src->pam;
1367 for (i = 0; i < ARRAY_SIZE(dest->chpid); i++) {
1368 dest->chpid[i] = src->chpid[i];
1369 }
1370 dest->chars = be32_to_cpu(src->chars);
1371 }
1372
1373 static void copy_scsw_from_guest(SCSW *dest, const SCSW *src)
1374 {
1375 dest->flags = be16_to_cpu(src->flags);
1376 dest->ctrl = be16_to_cpu(src->ctrl);
1377 dest->cpa = be32_to_cpu(src->cpa);
1378 dest->dstat = src->dstat;
1379 dest->cstat = src->cstat;
1380 dest->count = be16_to_cpu(src->count);
1381 }
1382
1383 static void copy_schib_from_guest(SCHIB *dest, const SCHIB *src)
1384 {
1385 int i;
1386 /*
1387 * We copy the PMCW and SCSW in and out of local variables to
1388 * avoid taking the address of members of a packed struct.
1389 */
1390 PMCW src_pmcw, dest_pmcw;
1391 SCSW src_scsw, dest_scsw;
1392
1393 src_pmcw = src->pmcw;
1394 copy_pmcw_from_guest(&dest_pmcw, &src_pmcw);
1395 dest->pmcw = dest_pmcw;
1396 src_scsw = src->scsw;
1397 copy_scsw_from_guest(&dest_scsw, &src_scsw);
1398 dest->scsw = dest_scsw;
1399 dest->mba = be64_to_cpu(src->mba);
1400 for (i = 0; i < ARRAY_SIZE(dest->mda); i++) {
1401 dest->mda[i] = src->mda[i];
1402 }
1403 }
1404
1405 IOInstEnding css_do_msch(SubchDev *sch, const SCHIB *orig_schib)
1406 {
1407 SCHIB *schib = &sch->curr_status;
1408 uint16_t oldflags;
1409 SCHIB schib_copy;
1410
1411 if (!(schib->pmcw.flags & PMCW_FLAGS_MASK_DNV)) {
1412 return IOINST_CC_EXPECTED;
1413 }
1414
1415 if (schib->scsw.ctrl & SCSW_STCTL_STATUS_PEND) {
1416 return IOINST_CC_STATUS_PRESENT;
1417 }
1418
1419 if (schib->scsw.ctrl &
1420 (SCSW_FCTL_START_FUNC|SCSW_FCTL_HALT_FUNC|SCSW_FCTL_CLEAR_FUNC)) {
1421 return IOINST_CC_BUSY;
1422 }
1423
1424 copy_schib_from_guest(&schib_copy, orig_schib);
1425 /* Only update the program-modifiable fields. */
1426 schib->pmcw.intparm = schib_copy.pmcw.intparm;
1427 oldflags = schib->pmcw.flags;
1428 schib->pmcw.flags &= ~(PMCW_FLAGS_MASK_ISC | PMCW_FLAGS_MASK_ENA |
1429 PMCW_FLAGS_MASK_LM | PMCW_FLAGS_MASK_MME |
1430 PMCW_FLAGS_MASK_MP);
1431 schib->pmcw.flags |= schib_copy.pmcw.flags &
1432 (PMCW_FLAGS_MASK_ISC | PMCW_FLAGS_MASK_ENA |
1433 PMCW_FLAGS_MASK_LM | PMCW_FLAGS_MASK_MME |
1434 PMCW_FLAGS_MASK_MP);
1435 schib->pmcw.lpm = schib_copy.pmcw.lpm;
1436 schib->pmcw.mbi = schib_copy.pmcw.mbi;
1437 schib->pmcw.pom = schib_copy.pmcw.pom;
1438 schib->pmcw.chars &= ~(PMCW_CHARS_MASK_MBFC | PMCW_CHARS_MASK_CSENSE);
1439 schib->pmcw.chars |= schib_copy.pmcw.chars &
1440 (PMCW_CHARS_MASK_MBFC | PMCW_CHARS_MASK_CSENSE);
1441 schib->mba = schib_copy.mba;
1442
1443 /* Has the channel been disabled? */
1444 if (sch->disable_cb && (oldflags & PMCW_FLAGS_MASK_ENA) != 0
1445 && (schib->pmcw.flags & PMCW_FLAGS_MASK_ENA) == 0) {
1446 sch->disable_cb(sch);
1447 }
1448 return IOINST_CC_EXPECTED;
1449 }
1450
1451 IOInstEnding css_do_xsch(SubchDev *sch)
1452 {
1453 SCHIB *schib = &sch->curr_status;
1454
1455 if (~(schib->pmcw.flags) & (PMCW_FLAGS_MASK_DNV | PMCW_FLAGS_MASK_ENA)) {
1456 return IOINST_CC_NOT_OPERATIONAL;
1457 }
1458
1459 if (schib->scsw.ctrl & SCSW_CTRL_MASK_STCTL) {
1460 return IOINST_CC_STATUS_PRESENT;
1461 }
1462
1463 if (!(schib->scsw.ctrl & SCSW_CTRL_MASK_FCTL) ||
1464 ((schib->scsw.ctrl & SCSW_CTRL_MASK_FCTL) != SCSW_FCTL_START_FUNC) ||
1465 (!(schib->scsw.ctrl &
1466 (SCSW_ACTL_RESUME_PEND | SCSW_ACTL_START_PEND | SCSW_ACTL_SUSP))) ||
1467 (schib->scsw.ctrl & SCSW_ACTL_SUBCH_ACTIVE)) {
1468 return IOINST_CC_BUSY;
1469 }
1470
1471 /* Cancel the current operation. */
1472 schib->scsw.ctrl &= ~(SCSW_FCTL_START_FUNC |
1473 SCSW_ACTL_RESUME_PEND |
1474 SCSW_ACTL_START_PEND |
1475 SCSW_ACTL_SUSP);
1476 sch->channel_prog = 0x0;
1477 sch->last_cmd_valid = false;
1478 schib->scsw.dstat = 0;
1479 schib->scsw.cstat = 0;
1480 return IOINST_CC_EXPECTED;
1481 }
1482
1483 IOInstEnding css_do_csch(SubchDev *sch)
1484 {
1485 SCHIB *schib = &sch->curr_status;
1486
1487 if (~(schib->pmcw.flags) & (PMCW_FLAGS_MASK_DNV | PMCW_FLAGS_MASK_ENA)) {
1488 return IOINST_CC_NOT_OPERATIONAL;
1489 }
1490
1491 /* Trigger the clear function. */
1492 schib->scsw.ctrl &= ~(SCSW_CTRL_MASK_FCTL | SCSW_CTRL_MASK_ACTL);
1493 schib->scsw.ctrl |= SCSW_FCTL_CLEAR_FUNC | SCSW_ACTL_CLEAR_PEND;
1494
1495 return do_subchannel_work(sch);
1496 }
1497
1498 IOInstEnding css_do_hsch(SubchDev *sch)
1499 {
1500 SCHIB *schib = &sch->curr_status;
1501
1502 if (~(schib->pmcw.flags) & (PMCW_FLAGS_MASK_DNV | PMCW_FLAGS_MASK_ENA)) {
1503 return IOINST_CC_NOT_OPERATIONAL;
1504 }
1505
1506 if (((schib->scsw.ctrl & SCSW_CTRL_MASK_STCTL) == SCSW_STCTL_STATUS_PEND) ||
1507 (schib->scsw.ctrl & (SCSW_STCTL_PRIMARY |
1508 SCSW_STCTL_SECONDARY |
1509 SCSW_STCTL_ALERT))) {
1510 return IOINST_CC_STATUS_PRESENT;
1511 }
1512
1513 if (schib->scsw.ctrl & (SCSW_FCTL_HALT_FUNC | SCSW_FCTL_CLEAR_FUNC)) {
1514 return IOINST_CC_BUSY;
1515 }
1516
1517 /* Trigger the halt function. */
1518 schib->scsw.ctrl |= SCSW_FCTL_HALT_FUNC;
1519 schib->scsw.ctrl &= ~SCSW_FCTL_START_FUNC;
1520 if (((schib->scsw.ctrl & SCSW_CTRL_MASK_ACTL) ==
1521 (SCSW_ACTL_SUBCH_ACTIVE | SCSW_ACTL_DEVICE_ACTIVE)) &&
1522 ((schib->scsw.ctrl & SCSW_CTRL_MASK_STCTL) ==
1523 SCSW_STCTL_INTERMEDIATE)) {
1524 schib->scsw.ctrl &= ~SCSW_STCTL_STATUS_PEND;
1525 }
1526 schib->scsw.ctrl |= SCSW_ACTL_HALT_PEND;
1527
1528 return do_subchannel_work(sch);
1529 }
1530
1531 static void css_update_chnmon(SubchDev *sch)
1532 {
1533 if (!(sch->curr_status.pmcw.flags & PMCW_FLAGS_MASK_MME)) {
1534 /* Not active. */
1535 return;
1536 }
1537 /* The counter is conveniently located at the beginning of the struct. */
1538 if (sch->curr_status.pmcw.chars & PMCW_CHARS_MASK_MBFC) {
1539 /* Format 1, per-subchannel area. */
1540 uint32_t count;
1541
1542 count = address_space_ldl(&address_space_memory,
1543 sch->curr_status.mba,
1544 MEMTXATTRS_UNSPECIFIED,
1545 NULL);
1546 count++;
1547 address_space_stl(&address_space_memory, sch->curr_status.mba, count,
1548 MEMTXATTRS_UNSPECIFIED, NULL);
1549 } else {
1550 /* Format 0, global area. */
1551 uint32_t offset;
1552 uint16_t count;
1553
1554 offset = sch->curr_status.pmcw.mbi << 5;
1555 count = address_space_lduw(&address_space_memory,
1556 channel_subsys.chnmon_area + offset,
1557 MEMTXATTRS_UNSPECIFIED,
1558 NULL);
1559 count++;
1560 address_space_stw(&address_space_memory,
1561 channel_subsys.chnmon_area + offset, count,
1562 MEMTXATTRS_UNSPECIFIED, NULL);
1563 }
1564 }
1565
1566 IOInstEnding css_do_ssch(SubchDev *sch, ORB *orb)
1567 {
1568 SCHIB *schib = &sch->curr_status;
1569
1570 if (~(schib->pmcw.flags) & (PMCW_FLAGS_MASK_DNV | PMCW_FLAGS_MASK_ENA)) {
1571 return IOINST_CC_NOT_OPERATIONAL;
1572 }
1573
1574 if (schib->scsw.ctrl & SCSW_STCTL_STATUS_PEND) {
1575 return IOINST_CC_STATUS_PRESENT;
1576 }
1577
1578 if (schib->scsw.ctrl & (SCSW_FCTL_START_FUNC |
1579 SCSW_FCTL_HALT_FUNC |
1580 SCSW_FCTL_CLEAR_FUNC)) {
1581 return IOINST_CC_BUSY;
1582 }
1583
1584 /* If monitoring is active, update counter. */
1585 if (channel_subsys.chnmon_active) {
1586 css_update_chnmon(sch);
1587 }
1588 sch->orb = *orb;
1589 sch->channel_prog = orb->cpa;
1590 /* Trigger the start function. */
1591 schib->scsw.ctrl |= (SCSW_FCTL_START_FUNC | SCSW_ACTL_START_PEND);
1592 schib->scsw.flags &= ~SCSW_FLAGS_MASK_PNO;
1593
1594 return do_subchannel_work(sch);
1595 }
1596
1597 static void copy_irb_to_guest(IRB *dest, const IRB *src, const PMCW *pmcw,
1598 int *irb_len)
1599 {
1600 int i;
1601 uint16_t stctl = src->scsw.ctrl & SCSW_CTRL_MASK_STCTL;
1602 uint16_t actl = src->scsw.ctrl & SCSW_CTRL_MASK_ACTL;
1603
1604 copy_scsw_to_guest(&dest->scsw, &src->scsw);
1605
1606 for (i = 0; i < ARRAY_SIZE(dest->esw); i++) {
1607 dest->esw[i] = cpu_to_be32(src->esw[i]);
1608 }
1609 for (i = 0; i < ARRAY_SIZE(dest->ecw); i++) {
1610 dest->ecw[i] = cpu_to_be32(src->ecw[i]);
1611 }
1612 *irb_len = sizeof(*dest) - sizeof(dest->emw);
1613
1614 /* extended measurements enabled? */
1615 if ((src->scsw.flags & SCSW_FLAGS_MASK_ESWF) ||
1616 !(pmcw->flags & PMCW_FLAGS_MASK_TF) ||
1617 !(pmcw->chars & PMCW_CHARS_MASK_XMWME)) {
1618 return;
1619 }
1620 /* extended measurements pending? */
1621 if (!(stctl & SCSW_STCTL_STATUS_PEND)) {
1622 return;
1623 }
1624 if ((stctl & SCSW_STCTL_PRIMARY) ||
1625 (stctl == SCSW_STCTL_SECONDARY) ||
1626 ((stctl & SCSW_STCTL_INTERMEDIATE) && (actl & SCSW_ACTL_SUSP))) {
1627 for (i = 0; i < ARRAY_SIZE(dest->emw); i++) {
1628 dest->emw[i] = cpu_to_be32(src->emw[i]);
1629 }
1630 }
1631 *irb_len = sizeof(*dest);
1632 }
1633
1634 int css_do_tsch_get_irb(SubchDev *sch, IRB *target_irb, int *irb_len)
1635 {
1636 SCHIB *schib = &sch->curr_status;
1637 PMCW p;
1638 uint16_t stctl;
1639 IRB irb;
1640
1641 if (~(schib->pmcw.flags) & (PMCW_FLAGS_MASK_DNV | PMCW_FLAGS_MASK_ENA)) {
1642 return 3;
1643 }
1644
1645 stctl = schib->scsw.ctrl & SCSW_CTRL_MASK_STCTL;
1646
1647 /* Prepare the irb for the guest. */
1648 memset(&irb, 0, sizeof(IRB));
1649
1650 /* Copy scsw from current status. */
1651 irb.scsw = schib->scsw;
1652 if (stctl & SCSW_STCTL_STATUS_PEND) {
1653 if (schib->scsw.cstat & (SCSW_CSTAT_DATA_CHECK |
1654 SCSW_CSTAT_CHN_CTRL_CHK |
1655 SCSW_CSTAT_INTF_CTRL_CHK)) {
1656 irb.scsw.flags |= SCSW_FLAGS_MASK_ESWF;
1657 irb.esw[0] = 0x04804000;
1658 } else {
1659 irb.esw[0] = 0x00800000;
1660 }
1661 /* If a unit check is pending, copy sense data. */
1662 if ((schib->scsw.dstat & SCSW_DSTAT_UNIT_CHECK) &&
1663 (schib->pmcw.chars & PMCW_CHARS_MASK_CSENSE)) {
1664 int i;
1665
1666 irb.scsw.flags |= SCSW_FLAGS_MASK_ESWF | SCSW_FLAGS_MASK_ECTL;
1667 /* Attention: sense_data is already BE! */
1668 memcpy(irb.ecw, sch->sense_data, sizeof(sch->sense_data));
1669 for (i = 0; i < ARRAY_SIZE(irb.ecw); i++) {
1670 irb.ecw[i] = be32_to_cpu(irb.ecw[i]);
1671 }
1672 irb.esw[1] = 0x01000000 | (sizeof(sch->sense_data) << 8);
1673 }
1674 }
1675 /* Store the irb to the guest. */
1676 p = schib->pmcw;
1677 copy_irb_to_guest(target_irb, &irb, &p, irb_len);
1678
1679 return ((stctl & SCSW_STCTL_STATUS_PEND) == 0);
1680 }
1681
1682 void css_do_tsch_update_subch(SubchDev *sch)
1683 {
1684 SCHIB *schib = &sch->curr_status;
1685 uint16_t stctl;
1686 uint16_t fctl;
1687 uint16_t actl;
1688
1689 stctl = schib->scsw.ctrl & SCSW_CTRL_MASK_STCTL;
1690 fctl = schib->scsw.ctrl & SCSW_CTRL_MASK_FCTL;
1691 actl = schib->scsw.ctrl & SCSW_CTRL_MASK_ACTL;
1692
1693 /* Clear conditions on subchannel, if applicable. */
1694 if (stctl & SCSW_STCTL_STATUS_PEND) {
1695 schib->scsw.ctrl &= ~SCSW_CTRL_MASK_STCTL;
1696 if ((stctl != (SCSW_STCTL_INTERMEDIATE | SCSW_STCTL_STATUS_PEND)) ||
1697 ((fctl & SCSW_FCTL_HALT_FUNC) &&
1698 (actl & SCSW_ACTL_SUSP))) {
1699 schib->scsw.ctrl &= ~SCSW_CTRL_MASK_FCTL;
1700 }
1701 if (stctl != (SCSW_STCTL_INTERMEDIATE | SCSW_STCTL_STATUS_PEND)) {
1702 schib->scsw.flags &= ~SCSW_FLAGS_MASK_PNO;
1703 schib->scsw.ctrl &= ~(SCSW_ACTL_RESUME_PEND |
1704 SCSW_ACTL_START_PEND |
1705 SCSW_ACTL_HALT_PEND |
1706 SCSW_ACTL_CLEAR_PEND |
1707 SCSW_ACTL_SUSP);
1708 } else {
1709 if ((actl & SCSW_ACTL_SUSP) &&
1710 (fctl & SCSW_FCTL_START_FUNC)) {
1711 schib->scsw.flags &= ~SCSW_FLAGS_MASK_PNO;
1712 if (fctl & SCSW_FCTL_HALT_FUNC) {
1713 schib->scsw.ctrl &= ~(SCSW_ACTL_RESUME_PEND |
1714 SCSW_ACTL_START_PEND |
1715 SCSW_ACTL_HALT_PEND |
1716 SCSW_ACTL_CLEAR_PEND |
1717 SCSW_ACTL_SUSP);
1718 } else {
1719 schib->scsw.ctrl &= ~SCSW_ACTL_RESUME_PEND;
1720 }
1721 }
1722 }
1723 /* Clear pending sense data. */
1724 if (schib->pmcw.chars & PMCW_CHARS_MASK_CSENSE) {
1725 memset(sch->sense_data, 0 , sizeof(sch->sense_data));
1726 }
1727 }
1728 }
1729
1730 static void copy_crw_to_guest(CRW *dest, const CRW *src)
1731 {
1732 dest->flags = cpu_to_be16(src->flags);
1733 dest->rsid = cpu_to_be16(src->rsid);
1734 }
1735
1736 int css_do_stcrw(CRW *crw)
1737 {
1738 CrwContainer *crw_cont;
1739 int ret;
1740
1741 crw_cont = QTAILQ_FIRST(&channel_subsys.pending_crws);
1742 if (crw_cont) {
1743 QTAILQ_REMOVE(&channel_subsys.pending_crws, crw_cont, sibling);
1744 copy_crw_to_guest(crw, &crw_cont->crw);
1745 g_free(crw_cont);
1746 ret = 0;
1747 } else {
1748 /* List was empty, turn crw machine checks on again. */
1749 memset(crw, 0, sizeof(*crw));
1750 channel_subsys.do_crw_mchk = true;
1751 ret = 1;
1752 }
1753
1754 return ret;
1755 }
1756
1757 static void copy_crw_from_guest(CRW *dest, const CRW *src)
1758 {
1759 dest->flags = be16_to_cpu(src->flags);
1760 dest->rsid = be16_to_cpu(src->rsid);
1761 }
1762
1763 void css_undo_stcrw(CRW *crw)
1764 {
1765 CrwContainer *crw_cont;
1766
1767 crw_cont = g_try_new0(CrwContainer, 1);
1768 if (!crw_cont) {
1769 channel_subsys.crws_lost = true;
1770 return;
1771 }
1772 copy_crw_from_guest(&crw_cont->crw, crw);
1773
1774 QTAILQ_INSERT_HEAD(&channel_subsys.pending_crws, crw_cont, sibling);
1775 }
1776
1777 int css_collect_chp_desc(int m, uint8_t cssid, uint8_t f_chpid, uint8_t l_chpid,
1778 int rfmt, void *buf)
1779 {
1780 int i, desc_size;
1781 uint32_t words[8];
1782 uint32_t chpid_type_word;
1783 CssImage *css;
1784
1785 if (!m && !cssid) {
1786 css = channel_subsys.css[channel_subsys.default_cssid];
1787 } else {
1788 css = channel_subsys.css[cssid];
1789 }
1790 if (!css) {
1791 return 0;
1792 }
1793 desc_size = 0;
1794 for (i = f_chpid; i <= l_chpid; i++) {
1795 if (css->chpids[i].in_use) {
1796 chpid_type_word = 0x80000000 | (css->chpids[i].type << 8) | i;
1797 if (rfmt == 0) {
1798 words[0] = cpu_to_be32(chpid_type_word);
1799 words[1] = 0;
1800 memcpy(buf + desc_size, words, 8);
1801 desc_size += 8;
1802 } else if (rfmt == 1) {
1803 words[0] = cpu_to_be32(chpid_type_word);
1804 words[1] = 0;
1805 words[2] = 0;
1806 words[3] = 0;
1807 words[4] = 0;
1808 words[5] = 0;
1809 words[6] = 0;
1810 words[7] = 0;
1811 memcpy(buf + desc_size, words, 32);
1812 desc_size += 32;
1813 }
1814 }
1815 }
1816 return desc_size;
1817 }
1818
1819 void css_do_schm(uint8_t mbk, int update, int dct, uint64_t mbo)
1820 {
1821 /* dct is currently ignored (not really meaningful for our devices) */
1822 /* TODO: Don't ignore mbk. */
1823 if (update && !channel_subsys.chnmon_active) {
1824 /* Enable measuring. */
1825 channel_subsys.chnmon_area = mbo;
1826 channel_subsys.chnmon_active = true;
1827 }
1828 if (!update && channel_subsys.chnmon_active) {
1829 /* Disable measuring. */
1830 channel_subsys.chnmon_area = 0;
1831 channel_subsys.chnmon_active = false;
1832 }
1833 }
1834
1835 IOInstEnding css_do_rsch(SubchDev *sch)
1836 {
1837 SCHIB *schib = &sch->curr_status;
1838
1839 if (~(schib->pmcw.flags) & (PMCW_FLAGS_MASK_DNV | PMCW_FLAGS_MASK_ENA)) {
1840 return IOINST_CC_NOT_OPERATIONAL;
1841 }
1842
1843 if (schib->scsw.ctrl & SCSW_STCTL_STATUS_PEND) {
1844 return IOINST_CC_STATUS_PRESENT;
1845 }
1846
1847 if (((schib->scsw.ctrl & SCSW_CTRL_MASK_FCTL) != SCSW_FCTL_START_FUNC) ||
1848 (schib->scsw.ctrl & SCSW_ACTL_RESUME_PEND) ||
1849 (!(schib->scsw.ctrl & SCSW_ACTL_SUSP))) {
1850 return IOINST_CC_BUSY;
1851 }
1852
1853 /* If monitoring is active, update counter. */
1854 if (channel_subsys.chnmon_active) {
1855 css_update_chnmon(sch);
1856 }
1857
1858 schib->scsw.ctrl |= SCSW_ACTL_RESUME_PEND;
1859 return do_subchannel_work(sch);
1860 }
1861
1862 int css_do_rchp(uint8_t cssid, uint8_t chpid)
1863 {
1864 uint8_t real_cssid;
1865
1866 if (cssid > channel_subsys.max_cssid) {
1867 return -EINVAL;
1868 }
1869 if (channel_subsys.max_cssid == 0) {
1870 real_cssid = channel_subsys.default_cssid;
1871 } else {
1872 real_cssid = cssid;
1873 }
1874 if (!channel_subsys.css[real_cssid]) {
1875 return -EINVAL;
1876 }
1877
1878 if (!channel_subsys.css[real_cssid]->chpids[chpid].in_use) {
1879 return -ENODEV;
1880 }
1881
1882 if (!channel_subsys.css[real_cssid]->chpids[chpid].is_virtual) {
1883 fprintf(stderr,
1884 "rchp unsupported for non-virtual chpid %x.%02x!\n",
1885 real_cssid, chpid);
1886 return -ENODEV;
1887 }
1888
1889 /* We don't really use a channel path, so we're done here. */
1890 css_queue_crw(CRW_RSC_CHP, CRW_ERC_INIT, 1,
1891 channel_subsys.max_cssid > 0 ? 1 : 0, chpid);
1892 if (channel_subsys.max_cssid > 0) {
1893 css_queue_crw(CRW_RSC_CHP, CRW_ERC_INIT, 1, 0, real_cssid << 8);
1894 }
1895 return 0;
1896 }
1897
1898 bool css_schid_final(int m, uint8_t cssid, uint8_t ssid, uint16_t schid)
1899 {
1900 SubchSet *set;
1901 uint8_t real_cssid;
1902
1903 real_cssid = (!m && (cssid == 0)) ? channel_subsys.default_cssid : cssid;
1904 if (ssid > MAX_SSID ||
1905 !channel_subsys.css[real_cssid] ||
1906 !channel_subsys.css[real_cssid]->sch_set[ssid]) {
1907 return true;
1908 }
1909 set = channel_subsys.css[real_cssid]->sch_set[ssid];
1910 return schid > find_last_bit(set->schids_used,
1911 (MAX_SCHID + 1) / sizeof(unsigned long));
1912 }
1913
1914 unsigned int css_find_free_chpid(uint8_t cssid)
1915 {
1916 CssImage *css = channel_subsys.css[cssid];
1917 unsigned int chpid;
1918
1919 if (!css) {
1920 return MAX_CHPID + 1;
1921 }
1922
1923 for (chpid = 0; chpid <= MAX_CHPID; chpid++) {
1924 /* skip reserved chpid */
1925 if (chpid == VIRTIO_CCW_CHPID) {
1926 continue;
1927 }
1928 if (!css->chpids[chpid].in_use) {
1929 return chpid;
1930 }
1931 }
1932 return MAX_CHPID + 1;
1933 }
1934
1935 static int css_add_chpid(uint8_t cssid, uint8_t chpid, uint8_t type,
1936 bool is_virt)
1937 {
1938 CssImage *css;
1939
1940 trace_css_chpid_add(cssid, chpid, type);
1941 css = channel_subsys.css[cssid];
1942 if (!css) {
1943 return -EINVAL;
1944 }
1945 if (css->chpids[chpid].in_use) {
1946 return -EEXIST;
1947 }
1948 css->chpids[chpid].in_use = 1;
1949 css->chpids[chpid].type = type;
1950 css->chpids[chpid].is_virtual = is_virt;
1951
1952 css_generate_chp_crws(cssid, chpid);
1953
1954 return 0;
1955 }
1956
1957 void css_sch_build_virtual_schib(SubchDev *sch, uint8_t chpid, uint8_t type)
1958 {
1959 SCHIB *schib = &sch->curr_status;
1960 int i;
1961 CssImage *css = channel_subsys.css[sch->cssid];
1962
1963 assert(css != NULL);
1964 memset(&schib->pmcw, 0, sizeof(PMCW));
1965 schib->pmcw.flags |= PMCW_FLAGS_MASK_DNV;
1966 schib->pmcw.devno = sch->devno;
1967 /* single path */
1968 schib->pmcw.pim = 0x80;
1969 schib->pmcw.pom = 0xff;
1970 schib->pmcw.pam = 0x80;
1971 schib->pmcw.chpid[0] = chpid;
1972 if (!css->chpids[chpid].in_use) {
1973 css_add_chpid(sch->cssid, chpid, type, true);
1974 }
1975
1976 memset(&schib->scsw, 0, sizeof(SCSW));
1977 schib->mba = 0;
1978 for (i = 0; i < ARRAY_SIZE(schib->mda); i++) {
1979 schib->mda[i] = 0;
1980 }
1981 }
1982
1983 SubchDev *css_find_subch(uint8_t m, uint8_t cssid, uint8_t ssid, uint16_t schid)
1984 {
1985 uint8_t real_cssid;
1986
1987 real_cssid = (!m && (cssid == 0)) ? channel_subsys.default_cssid : cssid;
1988
1989 if (!channel_subsys.css[real_cssid]) {
1990 return NULL;
1991 }
1992
1993 if (!channel_subsys.css[real_cssid]->sch_set[ssid]) {
1994 return NULL;
1995 }
1996
1997 return channel_subsys.css[real_cssid]->sch_set[ssid]->sch[schid];
1998 }
1999
2000 /**
2001 * Return free device number in subchannel set.
2002 *
2003 * Return index of the first free device number in the subchannel set
2004 * identified by @p cssid and @p ssid, beginning the search at @p
2005 * start and wrapping around at MAX_DEVNO. Return a value exceeding
2006 * MAX_SCHID if there are no free device numbers in the subchannel
2007 * set.
2008 */
2009 static uint32_t css_find_free_devno(uint8_t cssid, uint8_t ssid,
2010 uint16_t start)
2011 {
2012 uint32_t round;
2013
2014 for (round = 0; round <= MAX_DEVNO; round++) {
2015 uint16_t devno = (start + round) % MAX_DEVNO;
2016
2017 if (!css_devno_used(cssid, ssid, devno)) {
2018 return devno;
2019 }
2020 }
2021 return MAX_DEVNO + 1;
2022 }
2023
2024 /**
2025 * Return first free subchannel (id) in subchannel set.
2026 *
2027 * Return index of the first free subchannel in the subchannel set
2028 * identified by @p cssid and @p ssid, if there is any. Return a value
2029 * exceeding MAX_SCHID if there are no free subchannels in the
2030 * subchannel set.
2031 */
2032 static uint32_t css_find_free_subch(uint8_t cssid, uint8_t ssid)
2033 {
2034 uint32_t schid;
2035
2036 for (schid = 0; schid <= MAX_SCHID; schid++) {
2037 if (!css_find_subch(1, cssid, ssid, schid)) {
2038 return schid;
2039 }
2040 }
2041 return MAX_SCHID + 1;
2042 }
2043
2044 /**
2045 * Return first free subchannel (id) in subchannel set for a device number
2046 *
2047 * Verify the device number @p devno is not used yet in the subchannel
2048 * set identified by @p cssid and @p ssid. Set @p schid to the index
2049 * of the first free subchannel in the subchannel set, if there is
2050 * any. Return true if everything succeeded and false otherwise.
2051 */
2052 static bool css_find_free_subch_for_devno(uint8_t cssid, uint8_t ssid,
2053 uint16_t devno, uint16_t *schid,
2054 Error **errp)
2055 {
2056 uint32_t free_schid;
2057
2058 assert(schid);
2059 if (css_devno_used(cssid, ssid, devno)) {
2060 error_setg(errp, "Device %x.%x.%04x already exists",
2061 cssid, ssid, devno);
2062 return false;
2063 }
2064 free_schid = css_find_free_subch(cssid, ssid);
2065 if (free_schid > MAX_SCHID) {
2066 error_setg(errp, "No free subchannel found for %x.%x.%04x",
2067 cssid, ssid, devno);
2068 return false;
2069 }
2070 *schid = free_schid;
2071 return true;
2072 }
2073
2074 /**
2075 * Return first free subchannel (id) and device number
2076 *
2077 * Locate the first free subchannel and first free device number in
2078 * any of the subchannel sets of the channel subsystem identified by
2079 * @p cssid. Return false if no free subchannel / device number could
2080 * be found. Otherwise set @p ssid, @p devno and @p schid to identify
2081 * the available subchannel and device number and return true.
2082 *
2083 * May modify @p ssid, @p devno and / or @p schid even if no free
2084 * subchannel / device number could be found.
2085 */
2086 static bool css_find_free_subch_and_devno(uint8_t cssid, uint8_t *ssid,
2087 uint16_t *devno, uint16_t *schid,
2088 Error **errp)
2089 {
2090 uint32_t free_schid, free_devno;
2091
2092 assert(ssid && devno && schid);
2093 for (*ssid = 0; *ssid <= MAX_SSID; (*ssid)++) {
2094 free_schid = css_find_free_subch(cssid, *ssid);
2095 if (free_schid > MAX_SCHID) {
2096 continue;
2097 }
2098 free_devno = css_find_free_devno(cssid, *ssid, free_schid);
2099 if (free_devno > MAX_DEVNO) {
2100 continue;
2101 }
2102 *schid = free_schid;
2103 *devno = free_devno;
2104 return true;
2105 }
2106 error_setg(errp, "Virtual channel subsystem is full!");
2107 return false;
2108 }
2109
2110 bool css_subch_visible(SubchDev *sch)
2111 {
2112 if (sch->ssid > channel_subsys.max_ssid) {
2113 return false;
2114 }
2115
2116 if (sch->cssid != channel_subsys.default_cssid) {
2117 return (channel_subsys.max_cssid > 0);
2118 }
2119
2120 return true;
2121 }
2122
2123 bool css_present(uint8_t cssid)
2124 {
2125 return (channel_subsys.css[cssid] != NULL);
2126 }
2127
2128 bool css_devno_used(uint8_t cssid, uint8_t ssid, uint16_t devno)
2129 {
2130 if (!channel_subsys.css[cssid]) {
2131 return false;
2132 }
2133 if (!channel_subsys.css[cssid]->sch_set[ssid]) {
2134 return false;
2135 }
2136
2137 return !!test_bit(devno,
2138 channel_subsys.css[cssid]->sch_set[ssid]->devnos_used);
2139 }
2140
2141 void css_subch_assign(uint8_t cssid, uint8_t ssid, uint16_t schid,
2142 uint16_t devno, SubchDev *sch)
2143 {
2144 CssImage *css;
2145 SubchSet *s_set;
2146
2147 trace_css_assign_subch(sch ? "assign" : "deassign", cssid, ssid, schid,
2148 devno);
2149 if (!channel_subsys.css[cssid]) {
2150 fprintf(stderr,
2151 "Suspicious call to %s (%x.%x.%04x) for non-existing css!\n",
2152 __func__, cssid, ssid, schid);
2153 return;
2154 }
2155 css = channel_subsys.css[cssid];
2156
2157 if (!css->sch_set[ssid]) {
2158 css->sch_set[ssid] = g_new0(SubchSet, 1);
2159 }
2160 s_set = css->sch_set[ssid];
2161
2162 s_set->sch[schid] = sch;
2163 if (sch) {
2164 set_bit(schid, s_set->schids_used);
2165 set_bit(devno, s_set->devnos_used);
2166 } else {
2167 clear_bit(schid, s_set->schids_used);
2168 clear_bit(devno, s_set->devnos_used);
2169 }
2170 }
2171
2172 void css_crw_add_to_queue(CRW crw)
2173 {
2174 CrwContainer *crw_cont;
2175
2176 trace_css_crw((crw.flags & CRW_FLAGS_MASK_RSC) >> 8,
2177 crw.flags & CRW_FLAGS_MASK_ERC,
2178 crw.rsid,
2179 (crw.flags & CRW_FLAGS_MASK_C) ? "(chained)" : "");
2180
2181 /* TODO: Maybe use a static crw pool? */
2182 crw_cont = g_try_new0(CrwContainer, 1);
2183 if (!crw_cont) {
2184 channel_subsys.crws_lost = true;
2185 return;
2186 }
2187
2188 crw_cont->crw = crw;
2189
2190 QTAILQ_INSERT_TAIL(&channel_subsys.pending_crws, crw_cont, sibling);
2191
2192 if (channel_subsys.do_crw_mchk) {
2193 channel_subsys.do_crw_mchk = false;
2194 /* Inject crw pending machine check. */
2195 s390_crw_mchk();
2196 }
2197 }
2198
2199 void css_queue_crw(uint8_t rsc, uint8_t erc, int solicited,
2200 int chain, uint16_t rsid)
2201 {
2202 CRW crw;
2203
2204 crw.flags = (rsc << 8) | erc;
2205 if (solicited) {
2206 crw.flags |= CRW_FLAGS_MASK_S;
2207 }
2208 if (chain) {
2209 crw.flags |= CRW_FLAGS_MASK_C;
2210 }
2211 crw.rsid = rsid;
2212 if (channel_subsys.crws_lost) {
2213 crw.flags |= CRW_FLAGS_MASK_R;
2214 channel_subsys.crws_lost = false;
2215 }
2216
2217 css_crw_add_to_queue(crw);
2218 }
2219
2220 void css_generate_sch_crws(uint8_t cssid, uint8_t ssid, uint16_t schid,
2221 int hotplugged, int add)
2222 {
2223 uint8_t guest_cssid;
2224 bool chain_crw;
2225
2226 if (add && !hotplugged) {
2227 return;
2228 }
2229 if (channel_subsys.max_cssid == 0) {
2230 /* Default cssid shows up as 0. */
2231 guest_cssid = (cssid == channel_subsys.default_cssid) ? 0 : cssid;
2232 } else {
2233 /* Show real cssid to the guest. */
2234 guest_cssid = cssid;
2235 }
2236 /*
2237 * Only notify for higher subchannel sets/channel subsystems if the
2238 * guest has enabled it.
2239 */
2240 if ((ssid > channel_subsys.max_ssid) ||
2241 (guest_cssid > channel_subsys.max_cssid) ||
2242 ((channel_subsys.max_cssid == 0) &&
2243 (cssid != channel_subsys.default_cssid))) {
2244 return;
2245 }
2246 chain_crw = (channel_subsys.max_ssid > 0) ||
2247 (channel_subsys.max_cssid > 0);
2248 css_queue_crw(CRW_RSC_SUBCH, CRW_ERC_IPI, 0, chain_crw ? 1 : 0, schid);
2249 if (chain_crw) {
2250 css_queue_crw(CRW_RSC_SUBCH, CRW_ERC_IPI, 0, 0,
2251 (guest_cssid << 8) | (ssid << 4));
2252 }
2253 /* RW_ERC_IPI --> clear pending interrupts */
2254 css_clear_io_interrupt(css_do_build_subchannel_id(cssid, ssid), schid);
2255 }
2256
2257 void css_generate_chp_crws(uint8_t cssid, uint8_t chpid)
2258 {
2259 /* TODO */
2260 }
2261
2262 void css_generate_css_crws(uint8_t cssid)
2263 {
2264 if (!channel_subsys.sei_pending) {
2265 css_queue_crw(CRW_RSC_CSS, CRW_ERC_EVENT, 0, 0, cssid);
2266 }
2267 channel_subsys.sei_pending = true;
2268 }
2269
2270 void css_clear_sei_pending(void)
2271 {
2272 channel_subsys.sei_pending = false;
2273 }
2274
2275 int css_enable_mcsse(void)
2276 {
2277 trace_css_enable_facility("mcsse");
2278 channel_subsys.max_cssid = MAX_CSSID;
2279 return 0;
2280 }
2281
2282 int css_enable_mss(void)
2283 {
2284 trace_css_enable_facility("mss");
2285 channel_subsys.max_ssid = MAX_SSID;
2286 return 0;
2287 }
2288
2289 void css_reset_sch(SubchDev *sch)
2290 {
2291 SCHIB *schib = &sch->curr_status;
2292
2293 if ((schib->pmcw.flags & PMCW_FLAGS_MASK_ENA) != 0 && sch->disable_cb) {
2294 sch->disable_cb(sch);
2295 }
2296
2297 schib->pmcw.intparm = 0;
2298 schib->pmcw.flags &= ~(PMCW_FLAGS_MASK_ISC | PMCW_FLAGS_MASK_ENA |
2299 PMCW_FLAGS_MASK_LM | PMCW_FLAGS_MASK_MME |
2300 PMCW_FLAGS_MASK_MP | PMCW_FLAGS_MASK_TF);
2301 schib->pmcw.flags |= PMCW_FLAGS_MASK_DNV;
2302 schib->pmcw.devno = sch->devno;
2303 schib->pmcw.pim = 0x80;
2304 schib->pmcw.lpm = schib->pmcw.pim;
2305 schib->pmcw.pnom = 0;
2306 schib->pmcw.lpum = 0;
2307 schib->pmcw.mbi = 0;
2308 schib->pmcw.pom = 0xff;
2309 schib->pmcw.pam = 0x80;
2310 schib->pmcw.chars &= ~(PMCW_CHARS_MASK_MBFC | PMCW_CHARS_MASK_XMWME |
2311 PMCW_CHARS_MASK_CSENSE);
2312
2313 memset(&schib->scsw, 0, sizeof(schib->scsw));
2314 schib->mba = 0;
2315
2316 sch->channel_prog = 0x0;
2317 sch->last_cmd_valid = false;
2318 sch->thinint_active = false;
2319 }
2320
2321 void css_reset(void)
2322 {
2323 CrwContainer *crw_cont;
2324
2325 /* Clean up monitoring. */
2326 channel_subsys.chnmon_active = false;
2327 channel_subsys.chnmon_area = 0;
2328
2329 /* Clear pending CRWs. */
2330 while ((crw_cont = QTAILQ_FIRST(&channel_subsys.pending_crws))) {
2331 QTAILQ_REMOVE(&channel_subsys.pending_crws, crw_cont, sibling);
2332 g_free(crw_cont);
2333 }
2334 channel_subsys.sei_pending = false;
2335 channel_subsys.do_crw_mchk = true;
2336 channel_subsys.crws_lost = false;
2337
2338 /* Reset maximum ids. */
2339 channel_subsys.max_cssid = 0;
2340 channel_subsys.max_ssid = 0;
2341 }
2342
2343 static void get_css_devid(Object *obj, Visitor *v, const char *name,
2344 void *opaque, Error **errp)
2345 {
2346 DeviceState *dev = DEVICE(obj);
2347 Property *prop = opaque;
2348 CssDevId *dev_id = qdev_get_prop_ptr(dev, prop);
2349 char buffer[] = "xx.x.xxxx";
2350 char *p = buffer;
2351 int r;
2352
2353 if (dev_id->valid) {
2354
2355 r = snprintf(buffer, sizeof(buffer), "%02x.%1x.%04x", dev_id->cssid,
2356 dev_id->ssid, dev_id->devid);
2357 assert(r == sizeof(buffer) - 1);
2358
2359 /* drop leading zero */
2360 if (dev_id->cssid <= 0xf) {
2361 p++;
2362 }
2363 } else {
2364 snprintf(buffer, sizeof(buffer), "<unset>");
2365 }
2366
2367 visit_type_str(v, name, &p, errp);
2368 }
2369
2370 /*
2371 * parse <cssid>.<ssid>.<devid> and assert valid range for cssid/ssid
2372 */
2373 static void set_css_devid(Object *obj, Visitor *v, const char *name,
2374 void *opaque, Error **errp)
2375 {
2376 DeviceState *dev = DEVICE(obj);
2377 Property *prop = opaque;
2378 CssDevId *dev_id = qdev_get_prop_ptr(dev, prop);
2379 char *str;
2380 int num, n1, n2;
2381 unsigned int cssid, ssid, devid;
2382
2383 if (dev->realized) {
2384 qdev_prop_set_after_realize(dev, name, errp);
2385 return;
2386 }
2387
2388 if (!visit_type_str(v, name, &str, errp)) {
2389 return;
2390 }
2391
2392 num = sscanf(str, "%2x.%1x%n.%4x%n", &cssid, &ssid, &n1, &devid, &n2);
2393 if (num != 3 || (n2 - n1) != 5 || strlen(str) != n2) {
2394 error_set_from_qdev_prop_error(errp, EINVAL, dev, prop, str);
2395 goto out;
2396 }
2397 if ((cssid > MAX_CSSID) || (ssid > MAX_SSID)) {
2398 error_setg(errp, "Invalid cssid or ssid: cssid %x, ssid %x",
2399 cssid, ssid);
2400 goto out;
2401 }
2402
2403 dev_id->cssid = cssid;
2404 dev_id->ssid = ssid;
2405 dev_id->devid = devid;
2406 dev_id->valid = true;
2407
2408 out:
2409 g_free(str);
2410 }
2411
2412 const PropertyInfo css_devid_propinfo = {
2413 .name = "str",
2414 .description = "Identifier of an I/O device in the channel "
2415 "subsystem, example: fe.1.23ab",
2416 .get = get_css_devid,
2417 .set = set_css_devid,
2418 };
2419
2420 const PropertyInfo css_devid_ro_propinfo = {
2421 .name = "str",
2422 .description = "Read-only identifier of an I/O device in the channel "
2423 "subsystem, example: fe.1.23ab",
2424 .get = get_css_devid,
2425 };
2426
2427 SubchDev *css_create_sch(CssDevId bus_id, Error **errp)
2428 {
2429 uint16_t schid = 0;
2430 SubchDev *sch;
2431
2432 if (bus_id.valid) {
2433 if (!channel_subsys.css[bus_id.cssid]) {
2434 css_create_css_image(bus_id.cssid, false);
2435 }
2436
2437 if (!css_find_free_subch_for_devno(bus_id.cssid, bus_id.ssid,
2438 bus_id.devid, &schid, errp)) {
2439 return NULL;
2440 }
2441 } else {
2442 for (bus_id.cssid = channel_subsys.default_cssid;;) {
2443 if (!channel_subsys.css[bus_id.cssid]) {
2444 css_create_css_image(bus_id.cssid, false);
2445 }
2446
2447 if (css_find_free_subch_and_devno(bus_id.cssid, &bus_id.ssid,
2448 &bus_id.devid, &schid,
2449 NULL)) {
2450 break;
2451 }
2452 bus_id.cssid = (bus_id.cssid + 1) % MAX_CSSID;
2453 if (bus_id.cssid == channel_subsys.default_cssid) {
2454 error_setg(errp, "Virtual channel subsystem is full!");
2455 return NULL;
2456 }
2457 }
2458 }
2459
2460 sch = g_new0(SubchDev, 1);
2461 sch->cssid = bus_id.cssid;
2462 sch->ssid = bus_id.ssid;
2463 sch->devno = bus_id.devid;
2464 sch->schid = schid;
2465 css_subch_assign(sch->cssid, sch->ssid, schid, sch->devno, sch);
2466 return sch;
2467 }
2468
2469 static int css_sch_get_chpids(SubchDev *sch, CssDevId *dev_id)
2470 {
2471 char *fid_path;
2472 FILE *fd;
2473 uint32_t chpid[8];
2474 int i;
2475 SCHIB *schib = &sch->curr_status;
2476
2477 fid_path = g_strdup_printf("/sys/bus/css/devices/%x.%x.%04x/chpids",
2478 dev_id->cssid, dev_id->ssid, dev_id->devid);
2479 fd = fopen(fid_path, "r");
2480 if (fd == NULL) {
2481 error_report("%s: open %s failed", __func__, fid_path);
2482 g_free(fid_path);
2483 return -EINVAL;
2484 }
2485
2486 if (fscanf(fd, "%x %x %x %x %x %x %x %x",
2487 &chpid[0], &chpid[1], &chpid[2], &chpid[3],
2488 &chpid[4], &chpid[5], &chpid[6], &chpid[7]) != 8) {
2489 fclose(fd);
2490 g_free(fid_path);
2491 return -EINVAL;
2492 }
2493
2494 for (i = 0; i < ARRAY_SIZE(schib->pmcw.chpid); i++) {
2495 schib->pmcw.chpid[i] = chpid[i];
2496 }
2497
2498 fclose(fd);
2499 g_free(fid_path);
2500
2501 return 0;
2502 }
2503
2504 static int css_sch_get_path_masks(SubchDev *sch, CssDevId *dev_id)
2505 {
2506 char *fid_path;
2507 FILE *fd;
2508 uint32_t pim, pam, pom;
2509 SCHIB *schib = &sch->curr_status;
2510
2511 fid_path = g_strdup_printf("/sys/bus/css/devices/%x.%x.%04x/pimpampom",
2512 dev_id->cssid, dev_id->ssid, dev_id->devid);
2513 fd = fopen(fid_path, "r");
2514 if (fd == NULL) {
2515 error_report("%s: open %s failed", __func__, fid_path);
2516 g_free(fid_path);
2517 return -EINVAL;
2518 }
2519
2520 if (fscanf(fd, "%x %x %x", &pim, &pam, &pom) != 3) {
2521 fclose(fd);
2522 g_free(fid_path);
2523 return -EINVAL;
2524 }
2525
2526 schib->pmcw.pim = pim;
2527 schib->pmcw.pam = pam;
2528 schib->pmcw.pom = pom;
2529 fclose(fd);
2530 g_free(fid_path);
2531
2532 return 0;
2533 }
2534
2535 static int css_sch_get_chpid_type(uint8_t chpid, uint32_t *type,
2536 CssDevId *dev_id)
2537 {
2538 char *fid_path;
2539 FILE *fd;
2540
2541 fid_path = g_strdup_printf("/sys/devices/css%x/chp0.%02x/type",
2542 dev_id->cssid, chpid);
2543 fd = fopen(fid_path, "r");
2544 if (fd == NULL) {
2545 error_report("%s: open %s failed", __func__, fid_path);
2546 g_free(fid_path);
2547 return -EINVAL;
2548 }
2549
2550 if (fscanf(fd, "%x", type) != 1) {
2551 fclose(fd);
2552 g_free(fid_path);
2553 return -EINVAL;
2554 }
2555
2556 fclose(fd);
2557 g_free(fid_path);
2558
2559 return 0;
2560 }
2561
2562 /*
2563 * We currently retrieve the real device information from sysfs to build the
2564 * guest subchannel information block without considering the migration feature.
2565 * We need to revisit this problem when we want to add migration support.
2566 */
2567 int css_sch_build_schib(SubchDev *sch, CssDevId *dev_id)
2568 {
2569 CssImage *css = channel_subsys.css[sch->cssid];
2570 SCHIB *schib = &sch->curr_status;
2571 uint32_t type;
2572 int i, ret;
2573
2574 assert(css != NULL);
2575 memset(&schib->pmcw, 0, sizeof(PMCW));
2576 schib->pmcw.flags |= PMCW_FLAGS_MASK_DNV;
2577 /* We are dealing with I/O subchannels only. */
2578 schib->pmcw.devno = sch->devno;
2579
2580 /* Grab path mask from sysfs. */
2581 ret = css_sch_get_path_masks(sch, dev_id);
2582 if (ret) {
2583 return ret;
2584 }
2585
2586 /* Grab chpids from sysfs. */
2587 ret = css_sch_get_chpids(sch, dev_id);
2588 if (ret) {
2589 return ret;
2590 }
2591
2592 /* Build chpid type. */
2593 for (i = 0; i < ARRAY_SIZE(schib->pmcw.chpid); i++) {
2594 if (schib->pmcw.chpid[i] && !css->chpids[schib->pmcw.chpid[i]].in_use) {
2595 ret = css_sch_get_chpid_type(schib->pmcw.chpid[i], &type, dev_id);
2596 if (ret) {
2597 return ret;
2598 }
2599 css_add_chpid(sch->cssid, schib->pmcw.chpid[i], type, false);
2600 }
2601 }
2602
2603 memset(&schib->scsw, 0, sizeof(SCSW));
2604 schib->mba = 0;
2605 for (i = 0; i < ARRAY_SIZE(schib->mda); i++) {
2606 schib->mda[i] = 0;
2607 }
2608
2609 return 0;
2610 }