Merge remote-tracking branch 'remotes/philmd-gitlab/tags/renesas-20201027' into staging
[qemu.git] / hw / vfio / ccw.c
1 /*
2 * vfio based subchannel assignment support
3 *
4 * Copyright 2017 IBM Corp.
5 * Copyright 2019 Red Hat, Inc.
6 *
7 * Author(s): Dong Jia Shi <bjsdjshi@linux.vnet.ibm.com>
8 * Xiao Feng Ren <renxiaof@linux.vnet.ibm.com>
9 * Pierre Morel <pmorel@linux.vnet.ibm.com>
10 * Cornelia Huck <cohuck@redhat.com>
11 *
12 * This work is licensed under the terms of the GNU GPL, version 2 or (at
13 * your option) any later version. See the COPYING file in the top-level
14 * directory.
15 */
16
17 #include "qemu/osdep.h"
18 #include <linux/vfio.h>
19 #include <linux/vfio_ccw.h>
20 #include <sys/ioctl.h>
21
22 #include "qapi/error.h"
23 #include "hw/sysbus.h"
24 #include "hw/vfio/vfio.h"
25 #include "hw/vfio/vfio-common.h"
26 #include "hw/s390x/s390-ccw.h"
27 #include "hw/s390x/vfio-ccw.h"
28 #include "hw/qdev-properties.h"
29 #include "hw/s390x/ccw-device.h"
30 #include "exec/address-spaces.h"
31 #include "qemu/error-report.h"
32 #include "qemu/main-loop.h"
33 #include "qemu/module.h"
34
35 struct VFIOCCWDevice {
36 S390CCWDevice cdev;
37 VFIODevice vdev;
38 uint64_t io_region_size;
39 uint64_t io_region_offset;
40 struct ccw_io_region *io_region;
41 uint64_t async_cmd_region_size;
42 uint64_t async_cmd_region_offset;
43 struct ccw_cmd_region *async_cmd_region;
44 uint64_t schib_region_size;
45 uint64_t schib_region_offset;
46 struct ccw_schib_region *schib_region;
47 uint64_t crw_region_size;
48 uint64_t crw_region_offset;
49 struct ccw_crw_region *crw_region;
50 EventNotifier io_notifier;
51 EventNotifier crw_notifier;
52 bool force_orb_pfch;
53 bool warned_orb_pfch;
54 };
55
56 static inline void warn_once_pfch(VFIOCCWDevice *vcdev, SubchDev *sch,
57 const char *msg)
58 {
59 warn_report_once_cond(&vcdev->warned_orb_pfch,
60 "vfio-ccw (devno %x.%x.%04x): %s",
61 sch->cssid, sch->ssid, sch->devno, msg);
62 }
63
64 static void vfio_ccw_compute_needs_reset(VFIODevice *vdev)
65 {
66 vdev->needs_reset = false;
67 }
68
69 /*
70 * We don't need vfio_hot_reset_multi and vfio_eoi operations for
71 * vfio_ccw device now.
72 */
73 struct VFIODeviceOps vfio_ccw_ops = {
74 .vfio_compute_needs_reset = vfio_ccw_compute_needs_reset,
75 };
76
77 static IOInstEnding vfio_ccw_handle_request(SubchDev *sch)
78 {
79 S390CCWDevice *cdev = sch->driver_data;
80 VFIOCCWDevice *vcdev = DO_UPCAST(VFIOCCWDevice, cdev, cdev);
81 struct ccw_io_region *region = vcdev->io_region;
82 int ret;
83
84 if (!(sch->orb.ctrl0 & ORB_CTRL0_MASK_PFCH) && vcdev->force_orb_pfch) {
85 sch->orb.ctrl0 |= ORB_CTRL0_MASK_PFCH;
86 warn_once_pfch(vcdev, sch, "PFCH flag forced");
87 }
88
89 QEMU_BUILD_BUG_ON(sizeof(region->orb_area) != sizeof(ORB));
90 QEMU_BUILD_BUG_ON(sizeof(region->scsw_area) != sizeof(SCSW));
91 QEMU_BUILD_BUG_ON(sizeof(region->irb_area) != sizeof(IRB));
92
93 memset(region, 0, sizeof(*region));
94
95 memcpy(region->orb_area, &sch->orb, sizeof(ORB));
96 memcpy(region->scsw_area, &sch->curr_status.scsw, sizeof(SCSW));
97
98 again:
99 ret = pwrite(vcdev->vdev.fd, region,
100 vcdev->io_region_size, vcdev->io_region_offset);
101 if (ret != vcdev->io_region_size) {
102 if (errno == EAGAIN) {
103 goto again;
104 }
105 error_report("vfio-ccw: write I/O region failed with errno=%d", errno);
106 ret = -errno;
107 } else {
108 ret = region->ret_code;
109 }
110 switch (ret) {
111 case 0:
112 return IOINST_CC_EXPECTED;
113 case -EBUSY:
114 return IOINST_CC_BUSY;
115 case -ENODEV:
116 case -EACCES:
117 return IOINST_CC_NOT_OPERATIONAL;
118 case -EFAULT:
119 default:
120 sch_gen_unit_exception(sch);
121 css_inject_io_interrupt(sch);
122 return IOINST_CC_EXPECTED;
123 }
124 }
125
126 static IOInstEnding vfio_ccw_handle_store(SubchDev *sch)
127 {
128 S390CCWDevice *cdev = sch->driver_data;
129 VFIOCCWDevice *vcdev = DO_UPCAST(VFIOCCWDevice, cdev, cdev);
130 SCHIB *schib = &sch->curr_status;
131 struct ccw_schib_region *region = vcdev->schib_region;
132 SCHIB *s;
133 int ret;
134
135 /* schib region not available so nothing else to do */
136 if (!region) {
137 return IOINST_CC_EXPECTED;
138 }
139
140 memset(region, 0, sizeof(*region));
141 ret = pread(vcdev->vdev.fd, region, vcdev->schib_region_size,
142 vcdev->schib_region_offset);
143
144 if (ret == -1) {
145 /*
146 * Device is probably damaged, but store subchannel does not
147 * have a nonzero cc defined for this scenario. Log an error,
148 * and presume things are otherwise fine.
149 */
150 error_report("vfio-ccw: store region read failed with errno=%d", errno);
151 return IOINST_CC_EXPECTED;
152 }
153
154 /*
155 * Selectively copy path-related bits of the SCHIB,
156 * rather than copying the entire struct.
157 */
158 s = (SCHIB *)region->schib_area;
159 schib->pmcw.pnom = s->pmcw.pnom;
160 schib->pmcw.lpum = s->pmcw.lpum;
161 schib->pmcw.pam = s->pmcw.pam;
162 schib->pmcw.pom = s->pmcw.pom;
163
164 if (s->scsw.flags & SCSW_FLAGS_MASK_PNO) {
165 schib->scsw.flags |= SCSW_FLAGS_MASK_PNO;
166 }
167
168 return IOINST_CC_EXPECTED;
169 }
170
171 static int vfio_ccw_handle_clear(SubchDev *sch)
172 {
173 S390CCWDevice *cdev = sch->driver_data;
174 VFIOCCWDevice *vcdev = DO_UPCAST(VFIOCCWDevice, cdev, cdev);
175 struct ccw_cmd_region *region = vcdev->async_cmd_region;
176 int ret;
177
178 if (!vcdev->async_cmd_region) {
179 /* Async command region not available, fall back to emulation */
180 return -ENOSYS;
181 }
182
183 memset(region, 0, sizeof(*region));
184 region->command = VFIO_CCW_ASYNC_CMD_CSCH;
185
186 again:
187 ret = pwrite(vcdev->vdev.fd, region,
188 vcdev->async_cmd_region_size, vcdev->async_cmd_region_offset);
189 if (ret != vcdev->async_cmd_region_size) {
190 if (errno == EAGAIN) {
191 goto again;
192 }
193 error_report("vfio-ccw: write cmd region failed with errno=%d", errno);
194 ret = -errno;
195 } else {
196 ret = region->ret_code;
197 }
198 switch (ret) {
199 case 0:
200 case -ENODEV:
201 case -EACCES:
202 return 0;
203 case -EFAULT:
204 default:
205 sch_gen_unit_exception(sch);
206 css_inject_io_interrupt(sch);
207 return 0;
208 }
209 }
210
211 static int vfio_ccw_handle_halt(SubchDev *sch)
212 {
213 S390CCWDevice *cdev = sch->driver_data;
214 VFIOCCWDevice *vcdev = DO_UPCAST(VFIOCCWDevice, cdev, cdev);
215 struct ccw_cmd_region *region = vcdev->async_cmd_region;
216 int ret;
217
218 if (!vcdev->async_cmd_region) {
219 /* Async command region not available, fall back to emulation */
220 return -ENOSYS;
221 }
222
223 memset(region, 0, sizeof(*region));
224 region->command = VFIO_CCW_ASYNC_CMD_HSCH;
225
226 again:
227 ret = pwrite(vcdev->vdev.fd, region,
228 vcdev->async_cmd_region_size, vcdev->async_cmd_region_offset);
229 if (ret != vcdev->async_cmd_region_size) {
230 if (errno == EAGAIN) {
231 goto again;
232 }
233 error_report("vfio-ccw: write cmd region failed with errno=%d", errno);
234 ret = -errno;
235 } else {
236 ret = region->ret_code;
237 }
238 switch (ret) {
239 case 0:
240 case -EBUSY:
241 case -ENODEV:
242 case -EACCES:
243 return 0;
244 case -EFAULT:
245 default:
246 sch_gen_unit_exception(sch);
247 css_inject_io_interrupt(sch);
248 return 0;
249 }
250 }
251
252 static void vfio_ccw_reset(DeviceState *dev)
253 {
254 CcwDevice *ccw_dev = DO_UPCAST(CcwDevice, parent_obj, dev);
255 S390CCWDevice *cdev = DO_UPCAST(S390CCWDevice, parent_obj, ccw_dev);
256 VFIOCCWDevice *vcdev = DO_UPCAST(VFIOCCWDevice, cdev, cdev);
257
258 ioctl(vcdev->vdev.fd, VFIO_DEVICE_RESET);
259 }
260
261 static void vfio_ccw_crw_read(VFIOCCWDevice *vcdev)
262 {
263 struct ccw_crw_region *region = vcdev->crw_region;
264 CRW crw;
265 int size;
266
267 /* Keep reading CRWs as long as data is returned */
268 do {
269 memset(region, 0, sizeof(*region));
270 size = pread(vcdev->vdev.fd, region, vcdev->crw_region_size,
271 vcdev->crw_region_offset);
272
273 if (size == -1) {
274 error_report("vfio-ccw: Read crw region failed with errno=%d",
275 errno);
276 break;
277 }
278
279 if (region->crw == 0) {
280 /* No more CRWs to queue */
281 break;
282 }
283
284 memcpy(&crw, &region->crw, sizeof(CRW));
285
286 css_crw_add_to_queue(crw);
287 } while (1);
288 }
289
290 static void vfio_ccw_crw_notifier_handler(void *opaque)
291 {
292 VFIOCCWDevice *vcdev = opaque;
293
294 while (event_notifier_test_and_clear(&vcdev->crw_notifier)) {
295 vfio_ccw_crw_read(vcdev);
296 }
297 }
298
299 static void vfio_ccw_io_notifier_handler(void *opaque)
300 {
301 VFIOCCWDevice *vcdev = opaque;
302 struct ccw_io_region *region = vcdev->io_region;
303 S390CCWDevice *cdev = S390_CCW_DEVICE(vcdev);
304 CcwDevice *ccw_dev = CCW_DEVICE(cdev);
305 SubchDev *sch = ccw_dev->sch;
306 SCHIB *schib = &sch->curr_status;
307 SCSW s;
308 IRB irb;
309 int size;
310
311 if (!event_notifier_test_and_clear(&vcdev->io_notifier)) {
312 return;
313 }
314
315 size = pread(vcdev->vdev.fd, region, vcdev->io_region_size,
316 vcdev->io_region_offset);
317 if (size == -1) {
318 switch (errno) {
319 case ENODEV:
320 /* Generate a deferred cc 3 condition. */
321 schib->scsw.flags |= SCSW_FLAGS_MASK_CC;
322 schib->scsw.ctrl &= ~SCSW_CTRL_MASK_STCTL;
323 schib->scsw.ctrl |= (SCSW_STCTL_ALERT | SCSW_STCTL_STATUS_PEND);
324 goto read_err;
325 case EFAULT:
326 /* Memory problem, generate channel data check. */
327 schib->scsw.ctrl &= ~SCSW_ACTL_START_PEND;
328 schib->scsw.cstat = SCSW_CSTAT_DATA_CHECK;
329 schib->scsw.ctrl &= ~SCSW_CTRL_MASK_STCTL;
330 schib->scsw.ctrl |= SCSW_STCTL_PRIMARY | SCSW_STCTL_SECONDARY |
331 SCSW_STCTL_ALERT | SCSW_STCTL_STATUS_PEND;
332 goto read_err;
333 default:
334 /* Error, generate channel program check. */
335 schib->scsw.ctrl &= ~SCSW_ACTL_START_PEND;
336 schib->scsw.cstat = SCSW_CSTAT_PROG_CHECK;
337 schib->scsw.ctrl &= ~SCSW_CTRL_MASK_STCTL;
338 schib->scsw.ctrl |= SCSW_STCTL_PRIMARY | SCSW_STCTL_SECONDARY |
339 SCSW_STCTL_ALERT | SCSW_STCTL_STATUS_PEND;
340 goto read_err;
341 }
342 } else if (size != vcdev->io_region_size) {
343 /* Information transfer error, generate channel-control check. */
344 schib->scsw.ctrl &= ~SCSW_ACTL_START_PEND;
345 schib->scsw.cstat = SCSW_CSTAT_CHN_CTRL_CHK;
346 schib->scsw.ctrl &= ~SCSW_CTRL_MASK_STCTL;
347 schib->scsw.ctrl |= SCSW_STCTL_PRIMARY | SCSW_STCTL_SECONDARY |
348 SCSW_STCTL_ALERT | SCSW_STCTL_STATUS_PEND;
349 goto read_err;
350 }
351
352 memcpy(&irb, region->irb_area, sizeof(IRB));
353
354 /* Update control block via irb. */
355 s = schib->scsw;
356 copy_scsw_to_guest(&s, &irb.scsw);
357 schib->scsw = s;
358
359 /* If a uint check is pending, copy sense data. */
360 if ((schib->scsw.dstat & SCSW_DSTAT_UNIT_CHECK) &&
361 (schib->pmcw.chars & PMCW_CHARS_MASK_CSENSE)) {
362 memcpy(sch->sense_data, irb.ecw, sizeof(irb.ecw));
363 }
364
365 read_err:
366 css_inject_io_interrupt(sch);
367 }
368
369 static void vfio_ccw_register_irq_notifier(VFIOCCWDevice *vcdev,
370 unsigned int irq,
371 Error **errp)
372 {
373 VFIODevice *vdev = &vcdev->vdev;
374 struct vfio_irq_info *irq_info;
375 size_t argsz;
376 int fd;
377 EventNotifier *notifier;
378 IOHandler *fd_read;
379
380 switch (irq) {
381 case VFIO_CCW_IO_IRQ_INDEX:
382 notifier = &vcdev->io_notifier;
383 fd_read = vfio_ccw_io_notifier_handler;
384 break;
385 case VFIO_CCW_CRW_IRQ_INDEX:
386 notifier = &vcdev->crw_notifier;
387 fd_read = vfio_ccw_crw_notifier_handler;
388 break;
389 default:
390 error_setg(errp, "vfio: Unsupported device irq(%d)", irq);
391 return;
392 }
393
394 if (vdev->num_irqs < irq + 1) {
395 error_setg(errp, "vfio: unexpected number of irqs %u",
396 vdev->num_irqs);
397 return;
398 }
399
400 argsz = sizeof(*irq_info);
401 irq_info = g_malloc0(argsz);
402 irq_info->index = irq;
403 irq_info->argsz = argsz;
404 if (ioctl(vdev->fd, VFIO_DEVICE_GET_IRQ_INFO,
405 irq_info) < 0 || irq_info->count < 1) {
406 error_setg_errno(errp, errno, "vfio: Error getting irq info");
407 goto out_free_info;
408 }
409
410 if (event_notifier_init(notifier, 0)) {
411 error_setg_errno(errp, errno,
412 "vfio: Unable to init event notifier for irq (%d)",
413 irq);
414 goto out_free_info;
415 }
416
417 fd = event_notifier_get_fd(notifier);
418 qemu_set_fd_handler(fd, fd_read, NULL, vcdev);
419
420 if (vfio_set_irq_signaling(vdev, irq, 0,
421 VFIO_IRQ_SET_ACTION_TRIGGER, fd, errp)) {
422 qemu_set_fd_handler(fd, NULL, NULL, vcdev);
423 event_notifier_cleanup(notifier);
424 }
425
426 out_free_info:
427 g_free(irq_info);
428 }
429
430 static void vfio_ccw_unregister_irq_notifier(VFIOCCWDevice *vcdev,
431 unsigned int irq)
432 {
433 Error *err = NULL;
434 EventNotifier *notifier;
435
436 switch (irq) {
437 case VFIO_CCW_IO_IRQ_INDEX:
438 notifier = &vcdev->io_notifier;
439 break;
440 case VFIO_CCW_CRW_IRQ_INDEX:
441 notifier = &vcdev->crw_notifier;
442 break;
443 default:
444 error_report("vfio: Unsupported device irq(%d)", irq);
445 return;
446 }
447
448 if (vfio_set_irq_signaling(&vcdev->vdev, irq, 0,
449 VFIO_IRQ_SET_ACTION_TRIGGER, -1, &err)) {
450 error_reportf_err(err, VFIO_MSG_PREFIX, vcdev->vdev.name);
451 }
452
453 qemu_set_fd_handler(event_notifier_get_fd(notifier),
454 NULL, NULL, vcdev);
455 event_notifier_cleanup(notifier);
456 }
457
458 static void vfio_ccw_get_region(VFIOCCWDevice *vcdev, Error **errp)
459 {
460 VFIODevice *vdev = &vcdev->vdev;
461 struct vfio_region_info *info;
462 int ret;
463
464 /* Sanity check device */
465 if (!(vdev->flags & VFIO_DEVICE_FLAGS_CCW)) {
466 error_setg(errp, "vfio: Um, this isn't a vfio-ccw device");
467 return;
468 }
469
470 /*
471 * We always expect at least the I/O region to be present. We also
472 * may have a variable number of regions governed by capabilities.
473 */
474 if (vdev->num_regions < VFIO_CCW_CONFIG_REGION_INDEX + 1) {
475 error_setg(errp, "vfio: too few regions (%u), expected at least %u",
476 vdev->num_regions, VFIO_CCW_CONFIG_REGION_INDEX + 1);
477 return;
478 }
479
480 ret = vfio_get_region_info(vdev, VFIO_CCW_CONFIG_REGION_INDEX, &info);
481 if (ret) {
482 error_setg_errno(errp, -ret, "vfio: Error getting config info");
483 return;
484 }
485
486 vcdev->io_region_size = info->size;
487 if (sizeof(*vcdev->io_region) != vcdev->io_region_size) {
488 error_setg(errp, "vfio: Unexpected size of the I/O region");
489 goto out_err;
490 }
491
492 vcdev->io_region_offset = info->offset;
493 vcdev->io_region = g_malloc0(info->size);
494 g_free(info);
495
496 /* check for the optional async command region */
497 ret = vfio_get_dev_region_info(vdev, VFIO_REGION_TYPE_CCW,
498 VFIO_REGION_SUBTYPE_CCW_ASYNC_CMD, &info);
499 if (!ret) {
500 vcdev->async_cmd_region_size = info->size;
501 if (sizeof(*vcdev->async_cmd_region) != vcdev->async_cmd_region_size) {
502 error_setg(errp, "vfio: Unexpected size of the async cmd region");
503 goto out_err;
504 }
505 vcdev->async_cmd_region_offset = info->offset;
506 vcdev->async_cmd_region = g_malloc0(info->size);
507 g_free(info);
508 }
509
510 ret = vfio_get_dev_region_info(vdev, VFIO_REGION_TYPE_CCW,
511 VFIO_REGION_SUBTYPE_CCW_SCHIB, &info);
512 if (!ret) {
513 vcdev->schib_region_size = info->size;
514 if (sizeof(*vcdev->schib_region) != vcdev->schib_region_size) {
515 error_setg(errp, "vfio: Unexpected size of the schib region");
516 goto out_err;
517 }
518 vcdev->schib_region_offset = info->offset;
519 vcdev->schib_region = g_malloc(info->size);
520 g_free(info);
521 }
522
523 ret = vfio_get_dev_region_info(vdev, VFIO_REGION_TYPE_CCW,
524 VFIO_REGION_SUBTYPE_CCW_CRW, &info);
525
526 if (!ret) {
527 vcdev->crw_region_size = info->size;
528 if (sizeof(*vcdev->crw_region) != vcdev->crw_region_size) {
529 error_setg(errp, "vfio: Unexpected size of the CRW region");
530 goto out_err;
531 }
532 vcdev->crw_region_offset = info->offset;
533 vcdev->crw_region = g_malloc(info->size);
534 g_free(info);
535 }
536
537 return;
538
539 out_err:
540 g_free(vcdev->crw_region);
541 g_free(vcdev->schib_region);
542 g_free(vcdev->async_cmd_region);
543 g_free(vcdev->io_region);
544 g_free(info);
545 return;
546 }
547
548 static void vfio_ccw_put_region(VFIOCCWDevice *vcdev)
549 {
550 g_free(vcdev->crw_region);
551 g_free(vcdev->schib_region);
552 g_free(vcdev->async_cmd_region);
553 g_free(vcdev->io_region);
554 }
555
556 static void vfio_ccw_put_device(VFIOCCWDevice *vcdev)
557 {
558 g_free(vcdev->vdev.name);
559 vfio_put_base_device(&vcdev->vdev);
560 }
561
562 static void vfio_ccw_get_device(VFIOGroup *group, VFIOCCWDevice *vcdev,
563 Error **errp)
564 {
565 char *name = g_strdup_printf("%x.%x.%04x", vcdev->cdev.hostid.cssid,
566 vcdev->cdev.hostid.ssid,
567 vcdev->cdev.hostid.devid);
568 VFIODevice *vbasedev;
569
570 QLIST_FOREACH(vbasedev, &group->device_list, next) {
571 if (strcmp(vbasedev->name, name) == 0) {
572 error_setg(errp, "vfio: subchannel %s has already been attached",
573 name);
574 goto out_err;
575 }
576 }
577
578 /*
579 * All vfio-ccw devices are believed to operate in a way compatible with
580 * discarding of memory in RAM blocks, ie. pages pinned in the host are
581 * in the current working set of the guest driver and therefore never
582 * overlap e.g., with pages available to the guest balloon driver. This
583 * needs to be set before vfio_get_device() for vfio common to handle
584 * ram_block_discard_disable().
585 */
586 vcdev->vdev.ram_block_discard_allowed = true;
587
588 if (vfio_get_device(group, vcdev->cdev.mdevid, &vcdev->vdev, errp)) {
589 goto out_err;
590 }
591
592 vcdev->vdev.ops = &vfio_ccw_ops;
593 vcdev->vdev.type = VFIO_DEVICE_TYPE_CCW;
594 vcdev->vdev.name = name;
595 vcdev->vdev.dev = &vcdev->cdev.parent_obj.parent_obj;
596
597 return;
598
599 out_err:
600 g_free(name);
601 }
602
603 static VFIOGroup *vfio_ccw_get_group(S390CCWDevice *cdev, Error **errp)
604 {
605 char *tmp, group_path[PATH_MAX];
606 ssize_t len;
607 int groupid;
608
609 tmp = g_strdup_printf("/sys/bus/css/devices/%x.%x.%04x/%s/iommu_group",
610 cdev->hostid.cssid, cdev->hostid.ssid,
611 cdev->hostid.devid, cdev->mdevid);
612 len = readlink(tmp, group_path, sizeof(group_path));
613 g_free(tmp);
614
615 if (len <= 0 || len >= sizeof(group_path)) {
616 error_setg(errp, "vfio: no iommu_group found");
617 return NULL;
618 }
619
620 group_path[len] = 0;
621
622 if (sscanf(basename(group_path), "%d", &groupid) != 1) {
623 error_setg(errp, "vfio: failed to read %s", group_path);
624 return NULL;
625 }
626
627 return vfio_get_group(groupid, &address_space_memory, errp);
628 }
629
630 static void vfio_ccw_realize(DeviceState *dev, Error **errp)
631 {
632 VFIOGroup *group;
633 CcwDevice *ccw_dev = DO_UPCAST(CcwDevice, parent_obj, dev);
634 S390CCWDevice *cdev = DO_UPCAST(S390CCWDevice, parent_obj, ccw_dev);
635 VFIOCCWDevice *vcdev = DO_UPCAST(VFIOCCWDevice, cdev, cdev);
636 S390CCWDeviceClass *cdc = S390_CCW_DEVICE_GET_CLASS(cdev);
637 Error *err = NULL;
638
639 /* Call the class init function for subchannel. */
640 if (cdc->realize) {
641 cdc->realize(cdev, vcdev->vdev.sysfsdev, &err);
642 if (err) {
643 goto out_err_propagate;
644 }
645 }
646
647 group = vfio_ccw_get_group(cdev, &err);
648 if (!group) {
649 goto out_group_err;
650 }
651
652 vfio_ccw_get_device(group, vcdev, &err);
653 if (err) {
654 goto out_device_err;
655 }
656
657 vfio_ccw_get_region(vcdev, &err);
658 if (err) {
659 goto out_region_err;
660 }
661
662 vfio_ccw_register_irq_notifier(vcdev, VFIO_CCW_IO_IRQ_INDEX, &err);
663 if (err) {
664 goto out_notifier_err;
665 }
666
667 if (vcdev->crw_region) {
668 vfio_ccw_register_irq_notifier(vcdev, VFIO_CCW_CRW_IRQ_INDEX, &err);
669 if (err) {
670 vfio_ccw_unregister_irq_notifier(vcdev, VFIO_CCW_IO_IRQ_INDEX);
671 goto out_notifier_err;
672 }
673 }
674
675 return;
676
677 out_notifier_err:
678 vfio_ccw_put_region(vcdev);
679 out_region_err:
680 vfio_ccw_put_device(vcdev);
681 out_device_err:
682 vfio_put_group(group);
683 out_group_err:
684 if (cdc->unrealize) {
685 cdc->unrealize(cdev);
686 }
687 out_err_propagate:
688 error_propagate(errp, err);
689 }
690
691 static void vfio_ccw_unrealize(DeviceState *dev)
692 {
693 CcwDevice *ccw_dev = DO_UPCAST(CcwDevice, parent_obj, dev);
694 S390CCWDevice *cdev = DO_UPCAST(S390CCWDevice, parent_obj, ccw_dev);
695 VFIOCCWDevice *vcdev = DO_UPCAST(VFIOCCWDevice, cdev, cdev);
696 S390CCWDeviceClass *cdc = S390_CCW_DEVICE_GET_CLASS(cdev);
697 VFIOGroup *group = vcdev->vdev.group;
698
699 vfio_ccw_unregister_irq_notifier(vcdev, VFIO_CCW_CRW_IRQ_INDEX);
700 vfio_ccw_unregister_irq_notifier(vcdev, VFIO_CCW_IO_IRQ_INDEX);
701 vfio_ccw_put_region(vcdev);
702 vfio_ccw_put_device(vcdev);
703 vfio_put_group(group);
704
705 if (cdc->unrealize) {
706 cdc->unrealize(cdev);
707 }
708 }
709
710 static Property vfio_ccw_properties[] = {
711 DEFINE_PROP_STRING("sysfsdev", VFIOCCWDevice, vdev.sysfsdev),
712 DEFINE_PROP_BOOL("force-orb-pfch", VFIOCCWDevice, force_orb_pfch, false),
713 DEFINE_PROP_END_OF_LIST(),
714 };
715
716 static const VMStateDescription vfio_ccw_vmstate = {
717 .name = "vfio-ccw",
718 .unmigratable = 1,
719 };
720
721 static void vfio_ccw_class_init(ObjectClass *klass, void *data)
722 {
723 DeviceClass *dc = DEVICE_CLASS(klass);
724 S390CCWDeviceClass *cdc = S390_CCW_DEVICE_CLASS(klass);
725
726 device_class_set_props(dc, vfio_ccw_properties);
727 dc->vmsd = &vfio_ccw_vmstate;
728 dc->desc = "VFIO-based subchannel assignment";
729 set_bit(DEVICE_CATEGORY_MISC, dc->categories);
730 dc->realize = vfio_ccw_realize;
731 dc->unrealize = vfio_ccw_unrealize;
732 dc->reset = vfio_ccw_reset;
733
734 cdc->handle_request = vfio_ccw_handle_request;
735 cdc->handle_halt = vfio_ccw_handle_halt;
736 cdc->handle_clear = vfio_ccw_handle_clear;
737 cdc->handle_store = vfio_ccw_handle_store;
738 }
739
740 static const TypeInfo vfio_ccw_info = {
741 .name = TYPE_VFIO_CCW,
742 .parent = TYPE_S390_CCW,
743 .instance_size = sizeof(VFIOCCWDevice),
744 .class_init = vfio_ccw_class_init,
745 };
746
747 static void register_vfio_ccw_type(void)
748 {
749 type_register_static(&vfio_ccw_info);
750 }
751
752 type_init(register_vfio_ccw_type)