xref: /openbmc/qemu/hw/s390x/virtio-ccw.c (revision 81b07353c5e7ae9ae9360c357b7b4732b1cb03b4)
1 /*
2  * virtio ccw target implementation
3  *
4  * Copyright 2012,2014 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 "hw/hw.h"
13 #include "sysemu/block-backend.h"
14 #include "sysemu/blockdev.h"
15 #include "sysemu/sysemu.h"
16 #include "net/net.h"
17 #include "monitor/monitor.h"
18 #include "hw/virtio/virtio.h"
19 #include "hw/virtio/virtio-serial.h"
20 #include "hw/virtio/virtio-net.h"
21 #include "hw/sysbus.h"
22 #include "qemu/bitops.h"
23 #include "hw/virtio/virtio-bus.h"
24 #include "hw/s390x/adapter.h"
25 #include "hw/s390x/s390_flic.h"
26 
27 #include "ioinst.h"
28 #include "css.h"
29 #include "virtio-ccw.h"
30 #include "trace.h"
31 
32 static QTAILQ_HEAD(, IndAddr) indicator_addresses =
33     QTAILQ_HEAD_INITIALIZER(indicator_addresses);
34 
35 static IndAddr *get_indicator(hwaddr ind_addr, int len)
36 {
37     IndAddr *indicator;
38 
39     QTAILQ_FOREACH(indicator, &indicator_addresses, sibling) {
40         if (indicator->addr == ind_addr) {
41             indicator->refcnt++;
42             return indicator;
43         }
44     }
45     indicator = g_new0(IndAddr, 1);
46     indicator->addr = ind_addr;
47     indicator->len = len;
48     indicator->refcnt = 1;
49     QTAILQ_INSERT_TAIL(&indicator_addresses, indicator, sibling);
50     return indicator;
51 }
52 
53 static int s390_io_adapter_map(AdapterInfo *adapter, uint64_t map_addr,
54                                bool do_map)
55 {
56     S390FLICState *fs = s390_get_flic();
57     S390FLICStateClass *fsc = S390_FLIC_COMMON_GET_CLASS(fs);
58 
59     return fsc->io_adapter_map(fs, adapter->adapter_id, map_addr, do_map);
60 }
61 
62 static void release_indicator(AdapterInfo *adapter, IndAddr *indicator)
63 {
64     assert(indicator->refcnt > 0);
65     indicator->refcnt--;
66     if (indicator->refcnt > 0) {
67         return;
68     }
69     QTAILQ_REMOVE(&indicator_addresses, indicator, sibling);
70     if (indicator->map) {
71         s390_io_adapter_map(adapter, indicator->map, false);
72     }
73     g_free(indicator);
74 }
75 
76 static int map_indicator(AdapterInfo *adapter, IndAddr *indicator)
77 {
78     int ret;
79 
80     if (indicator->map) {
81         return 0; /* already mapped is not an error */
82     }
83     indicator->map = indicator->addr;
84     ret = s390_io_adapter_map(adapter, indicator->map, true);
85     if ((ret != 0) && (ret != -ENOSYS)) {
86         goto out_err;
87     }
88     return 0;
89 
90 out_err:
91     indicator->map = 0;
92     return ret;
93 }
94 
95 static void virtio_ccw_bus_new(VirtioBusState *bus, size_t bus_size,
96                                VirtioCcwDevice *dev);
97 
98 static void virtual_css_bus_reset(BusState *qbus)
99 {
100     /* This should actually be modelled via the generic css */
101     css_reset();
102 }
103 
104 
105 static void virtual_css_bus_class_init(ObjectClass *klass, void *data)
106 {
107     BusClass *k = BUS_CLASS(klass);
108 
109     k->reset = virtual_css_bus_reset;
110 }
111 
112 static const TypeInfo virtual_css_bus_info = {
113     .name = TYPE_VIRTUAL_CSS_BUS,
114     .parent = TYPE_BUS,
115     .instance_size = sizeof(VirtualCssBus),
116     .class_init = virtual_css_bus_class_init,
117 };
118 
119 VirtIODevice *virtio_ccw_get_vdev(SubchDev *sch)
120 {
121     VirtIODevice *vdev = NULL;
122     VirtioCcwDevice *dev = sch->driver_data;
123 
124     if (dev) {
125         vdev = virtio_bus_get_device(&dev->bus);
126     }
127     return vdev;
128 }
129 
130 static int virtio_ccw_set_guest2host_notifier(VirtioCcwDevice *dev, int n,
131                                               bool assign, bool set_handler)
132 {
133     VirtIODevice *vdev = virtio_bus_get_device(&dev->bus);
134     VirtQueue *vq = virtio_get_queue(vdev, n);
135     EventNotifier *notifier = virtio_queue_get_host_notifier(vq);
136     int r = 0;
137     SubchDev *sch = dev->sch;
138     uint32_t sch_id = (css_build_subchannel_id(sch) << 16) | sch->schid;
139 
140     if (assign) {
141         r = event_notifier_init(notifier, 1);
142         if (r < 0) {
143             error_report("%s: unable to init event notifier: %d", __func__, r);
144             return r;
145         }
146         virtio_queue_set_host_notifier_fd_handler(vq, true, set_handler);
147         r = s390_assign_subch_ioeventfd(notifier, sch_id, n, assign);
148         if (r < 0) {
149             error_report("%s: unable to assign ioeventfd: %d", __func__, r);
150             virtio_queue_set_host_notifier_fd_handler(vq, false, false);
151             event_notifier_cleanup(notifier);
152             return r;
153         }
154     } else {
155         virtio_queue_set_host_notifier_fd_handler(vq, false, false);
156         s390_assign_subch_ioeventfd(notifier, sch_id, n, assign);
157         event_notifier_cleanup(notifier);
158     }
159     return r;
160 }
161 
162 static void virtio_ccw_start_ioeventfd(VirtioCcwDevice *dev)
163 {
164     VirtIODevice *vdev;
165     int n, r;
166 
167     if (!(dev->flags & VIRTIO_CCW_FLAG_USE_IOEVENTFD) ||
168         dev->ioeventfd_disabled ||
169         dev->ioeventfd_started) {
170         return;
171     }
172     vdev = virtio_bus_get_device(&dev->bus);
173     for (n = 0; n < VIRTIO_PCI_QUEUE_MAX; n++) {
174         if (!virtio_queue_get_num(vdev, n)) {
175             continue;
176         }
177         r = virtio_ccw_set_guest2host_notifier(dev, n, true, true);
178         if (r < 0) {
179             goto assign_error;
180         }
181     }
182     dev->ioeventfd_started = true;
183     return;
184 
185   assign_error:
186     while (--n >= 0) {
187         if (!virtio_queue_get_num(vdev, n)) {
188             continue;
189         }
190         r = virtio_ccw_set_guest2host_notifier(dev, n, false, false);
191         assert(r >= 0);
192     }
193     dev->ioeventfd_started = false;
194     /* Disable ioeventfd for this device. */
195     dev->flags &= ~VIRTIO_CCW_FLAG_USE_IOEVENTFD;
196     error_report("%s: failed. Fallback to userspace (slower).", __func__);
197 }
198 
199 static void virtio_ccw_stop_ioeventfd(VirtioCcwDevice *dev)
200 {
201     VirtIODevice *vdev;
202     int n, r;
203 
204     if (!dev->ioeventfd_started) {
205         return;
206     }
207     vdev = virtio_bus_get_device(&dev->bus);
208     for (n = 0; n < VIRTIO_PCI_QUEUE_MAX; n++) {
209         if (!virtio_queue_get_num(vdev, n)) {
210             continue;
211         }
212         r = virtio_ccw_set_guest2host_notifier(dev, n, false, false);
213         assert(r >= 0);
214     }
215     dev->ioeventfd_started = false;
216 }
217 
218 VirtualCssBus *virtual_css_bus_init(void)
219 {
220     VirtualCssBus *cbus;
221     BusState *bus;
222     DeviceState *dev;
223 
224     /* Create bridge device */
225     dev = qdev_create(NULL, "virtual-css-bridge");
226     qdev_init_nofail(dev);
227 
228     /* Create bus on bridge device */
229     bus = qbus_create(TYPE_VIRTUAL_CSS_BUS, dev, "virtual-css");
230     cbus = VIRTUAL_CSS_BUS(bus);
231 
232     /* Enable hotplugging */
233     qbus_set_hotplug_handler(bus, dev, &error_abort);
234 
235     return cbus;
236 }
237 
238 /* Communication blocks used by several channel commands. */
239 typedef struct VqInfoBlock {
240     uint64_t queue;
241     uint32_t align;
242     uint16_t index;
243     uint16_t num;
244 } QEMU_PACKED VqInfoBlock;
245 
246 typedef struct VqConfigBlock {
247     uint16_t index;
248     uint16_t num_max;
249 } QEMU_PACKED VqConfigBlock;
250 
251 typedef struct VirtioFeatDesc {
252     uint32_t features;
253     uint8_t index;
254 } QEMU_PACKED VirtioFeatDesc;
255 
256 typedef struct VirtioThinintInfo {
257     hwaddr summary_indicator;
258     hwaddr device_indicator;
259     uint64_t ind_bit;
260     uint8_t isc;
261 } QEMU_PACKED VirtioThinintInfo;
262 
263 /* Specify where the virtqueues for the subchannel are in guest memory. */
264 static int virtio_ccw_set_vqs(SubchDev *sch, uint64_t addr, uint32_t align,
265                               uint16_t index, uint16_t num)
266 {
267     VirtIODevice *vdev = virtio_ccw_get_vdev(sch);
268 
269     if (index > VIRTIO_PCI_QUEUE_MAX) {
270         return -EINVAL;
271     }
272 
273     /* Current code in virtio.c relies on 4K alignment. */
274     if (addr && (align != 4096)) {
275         return -EINVAL;
276     }
277 
278     if (!vdev) {
279         return -EINVAL;
280     }
281 
282     virtio_queue_set_addr(vdev, index, addr);
283     if (!addr) {
284         virtio_queue_set_vector(vdev, index, 0);
285     } else {
286         /* Fail if we don't have a big enough queue. */
287         /* TODO: Add interface to handle vring.num changing */
288         if (virtio_queue_get_num(vdev, index) > num) {
289             return -EINVAL;
290         }
291         virtio_queue_set_vector(vdev, index, index);
292     }
293     /* tell notify handler in case of config change */
294     vdev->config_vector = VIRTIO_PCI_QUEUE_MAX;
295     return 0;
296 }
297 
298 static int virtio_ccw_cb(SubchDev *sch, CCW1 ccw)
299 {
300     int ret;
301     VqInfoBlock info;
302     uint8_t status;
303     VirtioFeatDesc features;
304     void *config;
305     hwaddr indicators;
306     VqConfigBlock vq_config;
307     VirtioCcwDevice *dev = sch->driver_data;
308     VirtIODevice *vdev = virtio_ccw_get_vdev(sch);
309     bool check_len;
310     int len;
311     hwaddr hw_len;
312     VirtioThinintInfo *thinint;
313 
314     if (!dev) {
315         return -EINVAL;
316     }
317 
318     trace_virtio_ccw_interpret_ccw(sch->cssid, sch->ssid, sch->schid,
319                                    ccw.cmd_code);
320     check_len = !((ccw.flags & CCW_FLAG_SLI) && !(ccw.flags & CCW_FLAG_DC));
321 
322     /* Look at the command. */
323     switch (ccw.cmd_code) {
324     case CCW_CMD_SET_VQ:
325         if (check_len) {
326             if (ccw.count != sizeof(info)) {
327                 ret = -EINVAL;
328                 break;
329             }
330         } else if (ccw.count < sizeof(info)) {
331             /* Can't execute command. */
332             ret = -EINVAL;
333             break;
334         }
335         if (!ccw.cda) {
336             ret = -EFAULT;
337         } else {
338             info.queue = ldq_phys(&address_space_memory, ccw.cda);
339             info.align = ldl_phys(&address_space_memory,
340                                   ccw.cda + sizeof(info.queue));
341             info.index = lduw_phys(&address_space_memory,
342                                    ccw.cda + sizeof(info.queue)
343                                    + sizeof(info.align));
344             info.num = lduw_phys(&address_space_memory,
345                                  ccw.cda + sizeof(info.queue)
346                                  + sizeof(info.align)
347                                  + sizeof(info.index));
348             ret = virtio_ccw_set_vqs(sch, info.queue, info.align, info.index,
349                                      info.num);
350             sch->curr_status.scsw.count = 0;
351         }
352         break;
353     case CCW_CMD_VDEV_RESET:
354         virtio_ccw_stop_ioeventfd(dev);
355         virtio_reset(vdev);
356         ret = 0;
357         break;
358     case CCW_CMD_READ_FEAT:
359         if (check_len) {
360             if (ccw.count != sizeof(features)) {
361                 ret = -EINVAL;
362                 break;
363             }
364         } else if (ccw.count < sizeof(features)) {
365             /* Can't execute command. */
366             ret = -EINVAL;
367             break;
368         }
369         if (!ccw.cda) {
370             ret = -EFAULT;
371         } else {
372             features.index = ldub_phys(&address_space_memory,
373                                        ccw.cda + sizeof(features.features));
374             if (features.index < ARRAY_SIZE(dev->host_features)) {
375                 features.features = dev->host_features[features.index];
376             } else {
377                 /* Return zeroes if the guest supports more feature bits. */
378                 features.features = 0;
379             }
380             stl_le_phys(&address_space_memory, ccw.cda, features.features);
381             sch->curr_status.scsw.count = ccw.count - sizeof(features);
382             ret = 0;
383         }
384         break;
385     case CCW_CMD_WRITE_FEAT:
386         if (check_len) {
387             if (ccw.count != sizeof(features)) {
388                 ret = -EINVAL;
389                 break;
390             }
391         } else if (ccw.count < sizeof(features)) {
392             /* Can't execute command. */
393             ret = -EINVAL;
394             break;
395         }
396         if (!ccw.cda) {
397             ret = -EFAULT;
398         } else {
399             features.index = ldub_phys(&address_space_memory,
400                                        ccw.cda + sizeof(features.features));
401             features.features = ldl_le_phys(&address_space_memory, ccw.cda);
402             if (features.index < ARRAY_SIZE(dev->host_features)) {
403                 virtio_set_features(vdev, features.features);
404             } else {
405                 /*
406                  * If the guest supports more feature bits, assert that it
407                  * passes us zeroes for those we don't support.
408                  */
409                 if (features.features) {
410                     fprintf(stderr, "Guest bug: features[%i]=%x (expected 0)\n",
411                             features.index, features.features);
412                     /* XXX: do a unit check here? */
413                 }
414             }
415             sch->curr_status.scsw.count = ccw.count - sizeof(features);
416             ret = 0;
417         }
418         break;
419     case CCW_CMD_READ_CONF:
420         if (check_len) {
421             if (ccw.count > vdev->config_len) {
422                 ret = -EINVAL;
423                 break;
424             }
425         }
426         len = MIN(ccw.count, vdev->config_len);
427         if (!ccw.cda) {
428             ret = -EFAULT;
429         } else {
430             virtio_bus_get_vdev_config(&dev->bus, vdev->config);
431             /* XXX config space endianness */
432             cpu_physical_memory_write(ccw.cda, vdev->config, len);
433             sch->curr_status.scsw.count = ccw.count - len;
434             ret = 0;
435         }
436         break;
437     case CCW_CMD_WRITE_CONF:
438         if (check_len) {
439             if (ccw.count > vdev->config_len) {
440                 ret = -EINVAL;
441                 break;
442             }
443         }
444         len = MIN(ccw.count, vdev->config_len);
445         hw_len = len;
446         if (!ccw.cda) {
447             ret = -EFAULT;
448         } else {
449             config = cpu_physical_memory_map(ccw.cda, &hw_len, 0);
450             if (!config) {
451                 ret = -EFAULT;
452             } else {
453                 len = hw_len;
454                 /* XXX config space endianness */
455                 memcpy(vdev->config, config, len);
456                 cpu_physical_memory_unmap(config, hw_len, 0, hw_len);
457                 virtio_bus_set_vdev_config(&dev->bus, vdev->config);
458                 sch->curr_status.scsw.count = ccw.count - len;
459                 ret = 0;
460             }
461         }
462         break;
463     case CCW_CMD_WRITE_STATUS:
464         if (check_len) {
465             if (ccw.count != sizeof(status)) {
466                 ret = -EINVAL;
467                 break;
468             }
469         } else if (ccw.count < sizeof(status)) {
470             /* Can't execute command. */
471             ret = -EINVAL;
472             break;
473         }
474         if (!ccw.cda) {
475             ret = -EFAULT;
476         } else {
477             status = ldub_phys(&address_space_memory, ccw.cda);
478             if (!(status & VIRTIO_CONFIG_S_DRIVER_OK)) {
479                 virtio_ccw_stop_ioeventfd(dev);
480             }
481             virtio_set_status(vdev, status);
482             if (vdev->status == 0) {
483                 virtio_reset(vdev);
484             }
485             if (status & VIRTIO_CONFIG_S_DRIVER_OK) {
486                 virtio_ccw_start_ioeventfd(dev);
487             }
488             sch->curr_status.scsw.count = ccw.count - sizeof(status);
489             ret = 0;
490         }
491         break;
492     case CCW_CMD_SET_IND:
493         if (check_len) {
494             if (ccw.count != sizeof(indicators)) {
495                 ret = -EINVAL;
496                 break;
497             }
498         } else if (ccw.count < sizeof(indicators)) {
499             /* Can't execute command. */
500             ret = -EINVAL;
501             break;
502         }
503         if (sch->thinint_active) {
504             /* Trigger a command reject. */
505             ret = -ENOSYS;
506             break;
507         }
508         if (!ccw.cda) {
509             ret = -EFAULT;
510         } else {
511             indicators = ldq_phys(&address_space_memory, ccw.cda);
512             dev->indicators = get_indicator(indicators, sizeof(uint64_t));
513             sch->curr_status.scsw.count = ccw.count - sizeof(indicators);
514             ret = 0;
515         }
516         break;
517     case CCW_CMD_SET_CONF_IND:
518         if (check_len) {
519             if (ccw.count != sizeof(indicators)) {
520                 ret = -EINVAL;
521                 break;
522             }
523         } else if (ccw.count < sizeof(indicators)) {
524             /* Can't execute command. */
525             ret = -EINVAL;
526             break;
527         }
528         if (!ccw.cda) {
529             ret = -EFAULT;
530         } else {
531             indicators = ldq_phys(&address_space_memory, ccw.cda);
532             dev->indicators2 = get_indicator(indicators, sizeof(uint64_t));
533             sch->curr_status.scsw.count = ccw.count - sizeof(indicators);
534             ret = 0;
535         }
536         break;
537     case CCW_CMD_READ_VQ_CONF:
538         if (check_len) {
539             if (ccw.count != sizeof(vq_config)) {
540                 ret = -EINVAL;
541                 break;
542             }
543         } else if (ccw.count < sizeof(vq_config)) {
544             /* Can't execute command. */
545             ret = -EINVAL;
546             break;
547         }
548         if (!ccw.cda) {
549             ret = -EFAULT;
550         } else {
551             vq_config.index = lduw_phys(&address_space_memory, ccw.cda);
552             vq_config.num_max = virtio_queue_get_num(vdev,
553                                                      vq_config.index);
554             stw_phys(&address_space_memory,
555                      ccw.cda + sizeof(vq_config.index), vq_config.num_max);
556             sch->curr_status.scsw.count = ccw.count - sizeof(vq_config);
557             ret = 0;
558         }
559         break;
560     case CCW_CMD_SET_IND_ADAPTER:
561         if (check_len) {
562             if (ccw.count != sizeof(*thinint)) {
563                 ret = -EINVAL;
564                 break;
565             }
566         } else if (ccw.count < sizeof(*thinint)) {
567             /* Can't execute command. */
568             ret = -EINVAL;
569             break;
570         }
571         len = sizeof(*thinint);
572         hw_len = len;
573         if (!ccw.cda) {
574             ret = -EFAULT;
575         } else if (dev->indicators && !sch->thinint_active) {
576             /* Trigger a command reject. */
577             ret = -ENOSYS;
578         } else {
579             thinint = cpu_physical_memory_map(ccw.cda, &hw_len, 0);
580             if (!thinint) {
581                 ret = -EFAULT;
582             } else {
583                 len = hw_len;
584                 dev->summary_indicator =
585                     get_indicator(thinint->summary_indicator, sizeof(uint8_t));
586                 dev->indicators = get_indicator(thinint->device_indicator,
587                                                 thinint->ind_bit / 8 + 1);
588                 dev->thinint_isc = thinint->isc;
589                 dev->routes.adapter.ind_offset = thinint->ind_bit;
590                 dev->routes.adapter.summary_offset = 7;
591                 cpu_physical_memory_unmap(thinint, hw_len, 0, hw_len);
592                 ret = css_register_io_adapter(CSS_IO_ADAPTER_VIRTIO,
593                                               dev->thinint_isc, true, false,
594                                               &dev->routes.adapter.adapter_id);
595                 assert(ret == 0);
596                 sch->thinint_active = ((dev->indicators != NULL) &&
597                                        (dev->summary_indicator != NULL));
598                 sch->curr_status.scsw.count = ccw.count - len;
599                 ret = 0;
600             }
601         }
602         break;
603     default:
604         ret = -ENOSYS;
605         break;
606     }
607     return ret;
608 }
609 
610 static int virtio_ccw_device_init(VirtioCcwDevice *dev, VirtIODevice *vdev)
611 {
612     unsigned int cssid = 0;
613     unsigned int ssid = 0;
614     unsigned int schid;
615     unsigned int devno;
616     bool have_devno = false;
617     bool found = false;
618     SubchDev *sch;
619     int ret;
620     int num;
621     DeviceState *parent = DEVICE(dev);
622 
623     sch = g_malloc0(sizeof(SubchDev));
624 
625     sch->driver_data = dev;
626     dev->sch = sch;
627 
628     dev->indicators = NULL;
629 
630     /* Initialize subchannel structure. */
631     sch->channel_prog = 0x0;
632     sch->last_cmd_valid = false;
633     sch->thinint_active = false;
634     /*
635      * Use a device number if provided. Otherwise, fall back to subchannel
636      * number.
637      */
638     if (dev->bus_id) {
639         num = sscanf(dev->bus_id, "%x.%x.%04x", &cssid, &ssid, &devno);
640         if (num == 3) {
641             if ((cssid > MAX_CSSID) || (ssid > MAX_SSID)) {
642                 ret = -EINVAL;
643                 error_report("Invalid cssid or ssid: cssid %x, ssid %x",
644                              cssid, ssid);
645                 goto out_err;
646             }
647             /* Enforce use of virtual cssid. */
648             if (cssid != VIRTUAL_CSSID) {
649                 ret = -EINVAL;
650                 error_report("cssid %x not valid for virtio devices", cssid);
651                 goto out_err;
652             }
653             if (css_devno_used(cssid, ssid, devno)) {
654                 ret = -EEXIST;
655                 error_report("Device %x.%x.%04x already exists", cssid, ssid,
656                              devno);
657                 goto out_err;
658             }
659             sch->cssid = cssid;
660             sch->ssid = ssid;
661             sch->devno = devno;
662             have_devno = true;
663         } else {
664             ret = -EINVAL;
665             error_report("Malformed devno parameter '%s'", dev->bus_id);
666             goto out_err;
667         }
668     }
669 
670     /* Find the next free id. */
671     if (have_devno) {
672         for (schid = 0; schid <= MAX_SCHID; schid++) {
673             if (!css_find_subch(1, cssid, ssid, schid)) {
674                 sch->schid = schid;
675                 css_subch_assign(cssid, ssid, schid, devno, sch);
676                 found = true;
677                 break;
678             }
679         }
680         if (!found) {
681             ret = -ENODEV;
682             error_report("No free subchannel found for %x.%x.%04x", cssid, ssid,
683                          devno);
684             goto out_err;
685         }
686         trace_virtio_ccw_new_device(cssid, ssid, schid, devno,
687                                     "user-configured");
688     } else {
689         cssid = VIRTUAL_CSSID;
690         for (ssid = 0; ssid <= MAX_SSID; ssid++) {
691             for (schid = 0; schid <= MAX_SCHID; schid++) {
692                 if (!css_find_subch(1, cssid, ssid, schid)) {
693                     sch->cssid = cssid;
694                     sch->ssid = ssid;
695                     sch->schid = schid;
696                     devno = schid;
697                     /*
698                      * If the devno is already taken, look further in this
699                      * subchannel set.
700                      */
701                     while (css_devno_used(cssid, ssid, devno)) {
702                         if (devno == MAX_SCHID) {
703                             devno = 0;
704                         } else if (devno == schid - 1) {
705                             ret = -ENODEV;
706                             error_report("No free devno found");
707                             goto out_err;
708                         } else {
709                             devno++;
710                         }
711                     }
712                     sch->devno = devno;
713                     css_subch_assign(cssid, ssid, schid, devno, sch);
714                     found = true;
715                     break;
716                 }
717             }
718             if (found) {
719                 break;
720             }
721         }
722         if (!found) {
723             ret = -ENODEV;
724             error_report("Virtual channel subsystem is full!");
725             goto out_err;
726         }
727         trace_virtio_ccw_new_device(cssid, ssid, schid, devno,
728                                     "auto-configured");
729     }
730 
731     /* Build initial schib. */
732     css_sch_build_virtual_schib(sch, 0, VIRTIO_CCW_CHPID_TYPE);
733 
734     sch->ccw_cb = virtio_ccw_cb;
735 
736     /* Build senseid data. */
737     memset(&sch->id, 0, sizeof(SenseId));
738     sch->id.reserved = 0xff;
739     sch->id.cu_type = VIRTIO_CCW_CU_TYPE;
740     sch->id.cu_model = vdev->device_id;
741 
742     /* Only the first 32 feature bits are used. */
743     dev->host_features[0] = virtio_bus_get_vdev_features(&dev->bus,
744                                                          dev->host_features[0]);
745 
746     virtio_add_feature(&dev->host_features[0], VIRTIO_F_NOTIFY_ON_EMPTY);
747     virtio_add_feature(&dev->host_features[0], VIRTIO_F_BAD_FEATURE);
748 
749     css_generate_sch_crws(sch->cssid, sch->ssid, sch->schid,
750                           parent->hotplugged, 1);
751     return 0;
752 
753 out_err:
754     dev->sch = NULL;
755     g_free(sch);
756     return ret;
757 }
758 
759 static int virtio_ccw_exit(VirtioCcwDevice *dev)
760 {
761     SubchDev *sch = dev->sch;
762 
763     if (sch) {
764         css_subch_assign(sch->cssid, sch->ssid, sch->schid, sch->devno, NULL);
765         g_free(sch);
766     }
767     if (dev->indicators) {
768         release_indicator(&dev->routes.adapter, dev->indicators);
769         dev->indicators = NULL;
770     }
771     return 0;
772 }
773 
774 static int virtio_ccw_net_init(VirtioCcwDevice *ccw_dev)
775 {
776     DeviceState *qdev = DEVICE(ccw_dev);
777     VirtIONetCcw *dev = VIRTIO_NET_CCW(ccw_dev);
778     DeviceState *vdev = DEVICE(&dev->vdev);
779 
780     virtio_net_set_config_size(&dev->vdev, ccw_dev->host_features[0]);
781     virtio_net_set_netclient_name(&dev->vdev, qdev->id,
782                                   object_get_typename(OBJECT(qdev)));
783     qdev_set_parent_bus(vdev, BUS(&ccw_dev->bus));
784     if (qdev_init(vdev) < 0) {
785         return -1;
786     }
787 
788     return virtio_ccw_device_init(ccw_dev, VIRTIO_DEVICE(vdev));
789 }
790 
791 static void virtio_ccw_net_instance_init(Object *obj)
792 {
793     VirtIONetCcw *dev = VIRTIO_NET_CCW(obj);
794 
795     virtio_instance_init_common(obj, &dev->vdev, sizeof(dev->vdev),
796                                 TYPE_VIRTIO_NET);
797     object_property_add_alias(obj, "bootindex", OBJECT(&dev->vdev),
798                               "bootindex", &error_abort);
799 }
800 
801 static int virtio_ccw_blk_init(VirtioCcwDevice *ccw_dev)
802 {
803     VirtIOBlkCcw *dev = VIRTIO_BLK_CCW(ccw_dev);
804     DeviceState *vdev = DEVICE(&dev->vdev);
805     qdev_set_parent_bus(vdev, BUS(&ccw_dev->bus));
806     if (qdev_init(vdev) < 0) {
807         return -1;
808     }
809 
810     return virtio_ccw_device_init(ccw_dev, VIRTIO_DEVICE(vdev));
811 }
812 
813 static void virtio_ccw_blk_instance_init(Object *obj)
814 {
815     VirtIOBlkCcw *dev = VIRTIO_BLK_CCW(obj);
816 
817     virtio_instance_init_common(obj, &dev->vdev, sizeof(dev->vdev),
818                                 TYPE_VIRTIO_BLK);
819     object_property_add_alias(obj, "iothread", OBJECT(&dev->vdev),"iothread",
820                               &error_abort);
821     object_property_add_alias(obj, "bootindex", OBJECT(&dev->vdev),
822                               "bootindex", &error_abort);
823 }
824 
825 static int virtio_ccw_serial_init(VirtioCcwDevice *ccw_dev)
826 {
827     VirtioSerialCcw *dev = VIRTIO_SERIAL_CCW(ccw_dev);
828     DeviceState *vdev = DEVICE(&dev->vdev);
829     DeviceState *proxy = DEVICE(ccw_dev);
830     char *bus_name;
831 
832     /*
833      * For command line compatibility, this sets the virtio-serial-device bus
834      * name as before.
835      */
836     if (proxy->id) {
837         bus_name = g_strdup_printf("%s.0", proxy->id);
838         virtio_device_set_child_bus_name(VIRTIO_DEVICE(vdev), bus_name);
839         g_free(bus_name);
840     }
841 
842     qdev_set_parent_bus(vdev, BUS(&ccw_dev->bus));
843     if (qdev_init(vdev) < 0) {
844         return -1;
845     }
846 
847     return virtio_ccw_device_init(ccw_dev, VIRTIO_DEVICE(vdev));
848 }
849 
850 
851 static void virtio_ccw_serial_instance_init(Object *obj)
852 {
853     VirtioSerialCcw *dev = VIRTIO_SERIAL_CCW(obj);
854 
855     virtio_instance_init_common(obj, &dev->vdev, sizeof(dev->vdev),
856                                 TYPE_VIRTIO_SERIAL);
857 }
858 
859 static int virtio_ccw_balloon_init(VirtioCcwDevice *ccw_dev)
860 {
861     VirtIOBalloonCcw *dev = VIRTIO_BALLOON_CCW(ccw_dev);
862     DeviceState *vdev = DEVICE(&dev->vdev);
863 
864     qdev_set_parent_bus(vdev, BUS(&ccw_dev->bus));
865     if (qdev_init(vdev) < 0) {
866         return -1;
867     }
868 
869     return virtio_ccw_device_init(ccw_dev, VIRTIO_DEVICE(vdev));
870 }
871 
872 static void balloon_ccw_stats_get_all(Object *obj, struct Visitor *v,
873                                       void *opaque, const char *name,
874                                       Error **errp)
875 {
876     VirtIOBalloonCcw *dev = opaque;
877     object_property_get(OBJECT(&dev->vdev), v, "guest-stats", errp);
878 }
879 
880 static void balloon_ccw_stats_get_poll_interval(Object *obj, struct Visitor *v,
881                                                 void *opaque, const char *name,
882                                                 Error **errp)
883 {
884     VirtIOBalloonCcw *dev = opaque;
885     object_property_get(OBJECT(&dev->vdev), v, "guest-stats-polling-interval",
886                         errp);
887 }
888 
889 static void balloon_ccw_stats_set_poll_interval(Object *obj, struct Visitor *v,
890                                                 void *opaque, const char *name,
891                                                 Error **errp)
892 {
893     VirtIOBalloonCcw *dev = opaque;
894     object_property_set(OBJECT(&dev->vdev), v, "guest-stats-polling-interval",
895                         errp);
896 }
897 
898 static void virtio_ccw_balloon_instance_init(Object *obj)
899 {
900     VirtIOBalloonCcw *dev = VIRTIO_BALLOON_CCW(obj);
901     virtio_instance_init_common(obj, &dev->vdev, sizeof(dev->vdev),
902                                 TYPE_VIRTIO_BALLOON);
903     object_property_add(obj, "guest-stats", "guest statistics",
904                         balloon_ccw_stats_get_all, NULL, NULL, dev, NULL);
905 
906     object_property_add(obj, "guest-stats-polling-interval", "int",
907                         balloon_ccw_stats_get_poll_interval,
908                         balloon_ccw_stats_set_poll_interval,
909                         NULL, dev, NULL);
910 }
911 
912 static int virtio_ccw_scsi_init(VirtioCcwDevice *ccw_dev)
913 {
914     VirtIOSCSICcw *dev = VIRTIO_SCSI_CCW(ccw_dev);
915     DeviceState *vdev = DEVICE(&dev->vdev);
916     DeviceState *qdev = DEVICE(ccw_dev);
917     char *bus_name;
918 
919     /*
920      * For command line compatibility, this sets the virtio-scsi-device bus
921      * name as before.
922      */
923     if (qdev->id) {
924         bus_name = g_strdup_printf("%s.0", qdev->id);
925         virtio_device_set_child_bus_name(VIRTIO_DEVICE(vdev), bus_name);
926         g_free(bus_name);
927     }
928 
929     qdev_set_parent_bus(vdev, BUS(&ccw_dev->bus));
930     if (qdev_init(vdev) < 0) {
931         return -1;
932     }
933 
934     return virtio_ccw_device_init(ccw_dev, VIRTIO_DEVICE(vdev));
935 }
936 
937 static void virtio_ccw_scsi_instance_init(Object *obj)
938 {
939     VirtIOSCSICcw *dev = VIRTIO_SCSI_CCW(obj);
940 
941     virtio_instance_init_common(obj, &dev->vdev, sizeof(dev->vdev),
942                                 TYPE_VIRTIO_SCSI);
943     object_property_add_alias(obj, "iothread", OBJECT(&dev->vdev), "iothread",
944                               &error_abort);
945 }
946 
947 #ifdef CONFIG_VHOST_SCSI
948 static int vhost_ccw_scsi_init(VirtioCcwDevice *ccw_dev)
949 {
950     VHostSCSICcw *dev = VHOST_SCSI_CCW(ccw_dev);
951     DeviceState *vdev = DEVICE(&dev->vdev);
952 
953     qdev_set_parent_bus(vdev, BUS(&ccw_dev->bus));
954     if (qdev_init(vdev) < 0) {
955         return -1;
956     }
957 
958     return virtio_ccw_device_init(ccw_dev, VIRTIO_DEVICE(vdev));
959 }
960 
961 static void vhost_ccw_scsi_instance_init(Object *obj)
962 {
963     VHostSCSICcw *dev = VHOST_SCSI_CCW(obj);
964 
965     virtio_instance_init_common(obj, &dev->vdev, sizeof(dev->vdev),
966                                 TYPE_VHOST_SCSI);
967 }
968 #endif
969 
970 static int virtio_ccw_rng_init(VirtioCcwDevice *ccw_dev)
971 {
972     VirtIORNGCcw *dev = VIRTIO_RNG_CCW(ccw_dev);
973     DeviceState *vdev = DEVICE(&dev->vdev);
974 
975     qdev_set_parent_bus(vdev, BUS(&ccw_dev->bus));
976     if (qdev_init(vdev) < 0) {
977         return -1;
978     }
979 
980     object_property_set_link(OBJECT(dev),
981                              OBJECT(dev->vdev.conf.rng), "rng",
982                              NULL);
983 
984     return virtio_ccw_device_init(ccw_dev, VIRTIO_DEVICE(vdev));
985 }
986 
987 /* DeviceState to VirtioCcwDevice. Note: used on datapath,
988  * be careful and test performance if you change this.
989  */
990 static inline VirtioCcwDevice *to_virtio_ccw_dev_fast(DeviceState *d)
991 {
992     return container_of(d, VirtioCcwDevice, parent_obj);
993 }
994 
995 static uint8_t virtio_set_ind_atomic(SubchDev *sch, uint64_t ind_loc,
996                                      uint8_t to_be_set)
997 {
998     uint8_t ind_old, ind_new;
999     hwaddr len = 1;
1000     uint8_t *ind_addr;
1001 
1002     ind_addr = cpu_physical_memory_map(ind_loc, &len, 1);
1003     if (!ind_addr) {
1004         error_report("%s(%x.%x.%04x): unable to access indicator",
1005                      __func__, sch->cssid, sch->ssid, sch->schid);
1006         return -1;
1007     }
1008     do {
1009         ind_old = *ind_addr;
1010         ind_new = ind_old | to_be_set;
1011     } while (atomic_cmpxchg(ind_addr, ind_old, ind_new) != ind_old);
1012     cpu_physical_memory_unmap(ind_addr, len, 1, len);
1013 
1014     return ind_old;
1015 }
1016 
1017 static void virtio_ccw_notify(DeviceState *d, uint16_t vector)
1018 {
1019     VirtioCcwDevice *dev = to_virtio_ccw_dev_fast(d);
1020     SubchDev *sch = dev->sch;
1021     uint64_t indicators;
1022 
1023     if (vector >= 128) {
1024         return;
1025     }
1026 
1027     if (vector < VIRTIO_PCI_QUEUE_MAX) {
1028         if (!dev->indicators) {
1029             return;
1030         }
1031         if (sch->thinint_active) {
1032             /*
1033              * In the adapter interrupt case, indicators points to a
1034              * memory area that may be (way) larger than 64 bit and
1035              * ind_bit indicates the start of the indicators in a big
1036              * endian notation.
1037              */
1038             uint64_t ind_bit = dev->routes.adapter.ind_offset;
1039 
1040             virtio_set_ind_atomic(sch, dev->indicators->addr +
1041                                   (ind_bit + vector) / 8,
1042                                   0x80 >> ((ind_bit + vector) % 8));
1043             if (!virtio_set_ind_atomic(sch, dev->summary_indicator->addr,
1044                                        0x01)) {
1045                 css_adapter_interrupt(dev->thinint_isc);
1046             }
1047         } else {
1048             indicators = ldq_phys(&address_space_memory, dev->indicators->addr);
1049             indicators |= 1ULL << vector;
1050             stq_phys(&address_space_memory, dev->indicators->addr, indicators);
1051             css_conditional_io_interrupt(sch);
1052         }
1053     } else {
1054         if (!dev->indicators2) {
1055             return;
1056         }
1057         vector = 0;
1058         indicators = ldq_phys(&address_space_memory, dev->indicators2->addr);
1059         indicators |= 1ULL << vector;
1060         stq_phys(&address_space_memory, dev->indicators2->addr, indicators);
1061         css_conditional_io_interrupt(sch);
1062     }
1063 }
1064 
1065 static unsigned virtio_ccw_get_features(DeviceState *d)
1066 {
1067     VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d);
1068 
1069     /* Only the first 32 feature bits are used. */
1070     return dev->host_features[0];
1071 }
1072 
1073 static void virtio_ccw_reset(DeviceState *d)
1074 {
1075     VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d);
1076     VirtIODevice *vdev = virtio_bus_get_device(&dev->bus);
1077 
1078     virtio_ccw_stop_ioeventfd(dev);
1079     virtio_reset(vdev);
1080     css_reset_sch(dev->sch);
1081     if (dev->indicators) {
1082         release_indicator(&dev->routes.adapter, dev->indicators);
1083         dev->indicators = NULL;
1084     }
1085     if (dev->indicators2) {
1086         release_indicator(&dev->routes.adapter, dev->indicators2);
1087         dev->indicators2 = NULL;
1088     }
1089     if (dev->summary_indicator) {
1090         release_indicator(&dev->routes.adapter, dev->summary_indicator);
1091         dev->summary_indicator = NULL;
1092     }
1093 }
1094 
1095 static void virtio_ccw_vmstate_change(DeviceState *d, bool running)
1096 {
1097     VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d);
1098 
1099     if (running) {
1100         virtio_ccw_start_ioeventfd(dev);
1101     } else {
1102         virtio_ccw_stop_ioeventfd(dev);
1103     }
1104 }
1105 
1106 static bool virtio_ccw_query_guest_notifiers(DeviceState *d)
1107 {
1108     VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d);
1109 
1110     return !!(dev->sch->curr_status.pmcw.flags & PMCW_FLAGS_MASK_ENA);
1111 }
1112 
1113 static int virtio_ccw_set_host_notifier(DeviceState *d, int n, bool assign)
1114 {
1115     VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d);
1116 
1117     /* Stop using the generic ioeventfd, we are doing eventfd handling
1118      * ourselves below */
1119     dev->ioeventfd_disabled = assign;
1120     if (assign) {
1121         virtio_ccw_stop_ioeventfd(dev);
1122     }
1123     return virtio_ccw_set_guest2host_notifier(dev, n, assign, false);
1124 }
1125 
1126 static int virtio_ccw_get_mappings(VirtioCcwDevice *dev)
1127 {
1128     int r;
1129 
1130     if (!dev->sch->thinint_active) {
1131         return -EINVAL;
1132     }
1133 
1134     r = map_indicator(&dev->routes.adapter, dev->summary_indicator);
1135     if (r) {
1136         return r;
1137     }
1138     r = map_indicator(&dev->routes.adapter, dev->indicators);
1139     if (r) {
1140         return r;
1141     }
1142     dev->routes.adapter.summary_addr = dev->summary_indicator->map;
1143     dev->routes.adapter.ind_addr = dev->indicators->map;
1144 
1145     return 0;
1146 }
1147 
1148 static int virtio_ccw_setup_irqroutes(VirtioCcwDevice *dev, int nvqs)
1149 {
1150     int i;
1151     VirtIODevice *vdev = virtio_bus_get_device(&dev->bus);
1152     int ret;
1153     S390FLICState *fs = s390_get_flic();
1154     S390FLICStateClass *fsc = S390_FLIC_COMMON_GET_CLASS(fs);
1155 
1156     ret = virtio_ccw_get_mappings(dev);
1157     if (ret) {
1158         return ret;
1159     }
1160     for (i = 0; i < nvqs; i++) {
1161         if (!virtio_queue_get_num(vdev, i)) {
1162             break;
1163         }
1164     }
1165     dev->routes.num_routes = i;
1166     return fsc->add_adapter_routes(fs, &dev->routes);
1167 }
1168 
1169 static void virtio_ccw_release_irqroutes(VirtioCcwDevice *dev, int nvqs)
1170 {
1171     S390FLICState *fs = s390_get_flic();
1172     S390FLICStateClass *fsc = S390_FLIC_COMMON_GET_CLASS(fs);
1173 
1174     fsc->release_adapter_routes(fs, &dev->routes);
1175 }
1176 
1177 static int virtio_ccw_add_irqfd(VirtioCcwDevice *dev, int n)
1178 {
1179     VirtIODevice *vdev = virtio_bus_get_device(&dev->bus);
1180     VirtQueue *vq = virtio_get_queue(vdev, n);
1181     EventNotifier *notifier = virtio_queue_get_guest_notifier(vq);
1182 
1183     return kvm_irqchip_add_irqfd_notifier(kvm_state, notifier, NULL,
1184                                           dev->routes.gsi[n]);
1185 }
1186 
1187 static void virtio_ccw_remove_irqfd(VirtioCcwDevice *dev, int n)
1188 {
1189     VirtIODevice *vdev = virtio_bus_get_device(&dev->bus);
1190     VirtQueue *vq = virtio_get_queue(vdev, n);
1191     EventNotifier *notifier = virtio_queue_get_guest_notifier(vq);
1192     int ret;
1193 
1194     ret = kvm_irqchip_remove_irqfd_notifier(kvm_state, notifier,
1195                                             dev->routes.gsi[n]);
1196     assert(ret == 0);
1197 }
1198 
1199 static int virtio_ccw_set_guest_notifier(VirtioCcwDevice *dev, int n,
1200                                          bool assign, bool with_irqfd)
1201 {
1202     VirtIODevice *vdev = virtio_bus_get_device(&dev->bus);
1203     VirtQueue *vq = virtio_get_queue(vdev, n);
1204     EventNotifier *notifier = virtio_queue_get_guest_notifier(vq);
1205     VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
1206 
1207     if (assign) {
1208         int r = event_notifier_init(notifier, 0);
1209 
1210         if (r < 0) {
1211             return r;
1212         }
1213         virtio_queue_set_guest_notifier_fd_handler(vq, true, with_irqfd);
1214         if (with_irqfd) {
1215             r = virtio_ccw_add_irqfd(dev, n);
1216             if (r) {
1217                 virtio_queue_set_guest_notifier_fd_handler(vq, false,
1218                                                            with_irqfd);
1219                 return r;
1220             }
1221         }
1222         /*
1223          * We do not support individual masking for channel devices, so we
1224          * need to manually trigger any guest masking callbacks here.
1225          */
1226         if (k->guest_notifier_mask) {
1227             k->guest_notifier_mask(vdev, n, false);
1228         }
1229         /* get lost events and re-inject */
1230         if (k->guest_notifier_pending &&
1231             k->guest_notifier_pending(vdev, n)) {
1232             event_notifier_set(notifier);
1233         }
1234     } else {
1235         if (k->guest_notifier_mask) {
1236             k->guest_notifier_mask(vdev, n, true);
1237         }
1238         if (with_irqfd) {
1239             virtio_ccw_remove_irqfd(dev, n);
1240         }
1241         virtio_queue_set_guest_notifier_fd_handler(vq, false, with_irqfd);
1242         event_notifier_cleanup(notifier);
1243     }
1244     return 0;
1245 }
1246 
1247 static int virtio_ccw_set_guest_notifiers(DeviceState *d, int nvqs,
1248                                           bool assigned)
1249 {
1250     VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d);
1251     VirtIODevice *vdev = virtio_bus_get_device(&dev->bus);
1252     bool with_irqfd = dev->sch->thinint_active && kvm_irqfds_enabled();
1253     int r, n;
1254 
1255     if (with_irqfd && assigned) {
1256         /* irq routes need to be set up before assigning irqfds */
1257         r = virtio_ccw_setup_irqroutes(dev, nvqs);
1258         if (r < 0) {
1259             goto irqroute_error;
1260         }
1261     }
1262     for (n = 0; n < nvqs; n++) {
1263         if (!virtio_queue_get_num(vdev, n)) {
1264             break;
1265         }
1266         r = virtio_ccw_set_guest_notifier(dev, n, assigned, with_irqfd);
1267         if (r < 0) {
1268             goto assign_error;
1269         }
1270     }
1271     if (with_irqfd && !assigned) {
1272         /* release irq routes after irqfds have been released */
1273         virtio_ccw_release_irqroutes(dev, nvqs);
1274     }
1275     return 0;
1276 
1277 assign_error:
1278     while (--n >= 0) {
1279         virtio_ccw_set_guest_notifier(dev, n, !assigned, false);
1280     }
1281 irqroute_error:
1282     if (with_irqfd && assigned) {
1283         virtio_ccw_release_irqroutes(dev, nvqs);
1284     }
1285     return r;
1286 }
1287 
1288 static void virtio_ccw_save_queue(DeviceState *d, int n, QEMUFile *f)
1289 {
1290     VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d);
1291     VirtIODevice *vdev = virtio_bus_get_device(&dev->bus);
1292 
1293     qemu_put_be16(f, virtio_queue_vector(vdev, n));
1294 }
1295 
1296 static int virtio_ccw_load_queue(DeviceState *d, int n, QEMUFile *f)
1297 {
1298     VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d);
1299     VirtIODevice *vdev = virtio_bus_get_device(&dev->bus);
1300     uint16_t vector;
1301 
1302     qemu_get_be16s(f, &vector);
1303     virtio_queue_set_vector(vdev, n , vector);
1304 
1305     return 0;
1306 }
1307 
1308 static void virtio_ccw_save_config(DeviceState *d, QEMUFile *f)
1309 {
1310     VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d);
1311     SubchDev *s = dev->sch;
1312 
1313     subch_device_save(s, f);
1314     if (dev->indicators != NULL) {
1315         qemu_put_be32(f, dev->indicators->len);
1316         qemu_put_be64(f, dev->indicators->addr);
1317     } else {
1318         qemu_put_be32(f, 0);
1319         qemu_put_be64(f, 0UL);
1320     }
1321     if (dev->indicators2 != NULL) {
1322         qemu_put_be32(f, dev->indicators2->len);
1323         qemu_put_be64(f, dev->indicators2->addr);
1324     } else {
1325         qemu_put_be32(f, 0);
1326         qemu_put_be64(f, 0UL);
1327     }
1328     if (dev->summary_indicator != NULL) {
1329         qemu_put_be32(f, dev->summary_indicator->len);
1330         qemu_put_be64(f, dev->summary_indicator->addr);
1331     } else {
1332         qemu_put_be32(f, 0);
1333         qemu_put_be64(f, 0UL);
1334     }
1335     qemu_put_be64(f, dev->routes.adapter.ind_offset);
1336     qemu_put_byte(f, dev->thinint_isc);
1337 }
1338 
1339 static int virtio_ccw_load_config(DeviceState *d, QEMUFile *f)
1340 {
1341     VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d);
1342     SubchDev *s = dev->sch;
1343     int len;
1344 
1345     s->driver_data = dev;
1346     subch_device_load(s, f);
1347     len = qemu_get_be32(f);
1348     if (len != 0) {
1349         dev->indicators = get_indicator(qemu_get_be64(f), len);
1350     } else {
1351         qemu_get_be64(f);
1352         dev->indicators = NULL;
1353     }
1354     len = qemu_get_be32(f);
1355     if (len != 0) {
1356         dev->indicators2 = get_indicator(qemu_get_be64(f), len);
1357     } else {
1358         qemu_get_be64(f);
1359         dev->indicators2 = NULL;
1360     }
1361     len = qemu_get_be32(f);
1362     if (len != 0) {
1363         dev->summary_indicator = get_indicator(qemu_get_be64(f), len);
1364     } else {
1365         qemu_get_be64(f);
1366         dev->summary_indicator = NULL;
1367     }
1368     dev->routes.adapter.ind_offset = qemu_get_be64(f);
1369     dev->thinint_isc = qemu_get_byte(f);
1370     if (s->thinint_active) {
1371         return css_register_io_adapter(CSS_IO_ADAPTER_VIRTIO,
1372                                        dev->thinint_isc, true, false,
1373                                        &dev->routes.adapter.adapter_id);
1374     }
1375 
1376     return 0;
1377 }
1378 
1379 /**************** Virtio-ccw Bus Device Descriptions *******************/
1380 
1381 static Property virtio_ccw_net_properties[] = {
1382     DEFINE_PROP_STRING("devno", VirtioCcwDevice, bus_id),
1383     DEFINE_VIRTIO_NET_FEATURES(VirtioCcwDevice, host_features[0]),
1384     DEFINE_PROP_BIT("ioeventfd", VirtioCcwDevice, flags,
1385                     VIRTIO_CCW_FLAG_USE_IOEVENTFD_BIT, true),
1386     DEFINE_PROP_END_OF_LIST(),
1387 };
1388 
1389 static void virtio_ccw_net_class_init(ObjectClass *klass, void *data)
1390 {
1391     DeviceClass *dc = DEVICE_CLASS(klass);
1392     VirtIOCCWDeviceClass *k = VIRTIO_CCW_DEVICE_CLASS(klass);
1393 
1394     k->init = virtio_ccw_net_init;
1395     k->exit = virtio_ccw_exit;
1396     dc->reset = virtio_ccw_reset;
1397     dc->props = virtio_ccw_net_properties;
1398 }
1399 
1400 static const TypeInfo virtio_ccw_net = {
1401     .name          = TYPE_VIRTIO_NET_CCW,
1402     .parent        = TYPE_VIRTIO_CCW_DEVICE,
1403     .instance_size = sizeof(VirtIONetCcw),
1404     .instance_init = virtio_ccw_net_instance_init,
1405     .class_init    = virtio_ccw_net_class_init,
1406 };
1407 
1408 static Property virtio_ccw_blk_properties[] = {
1409     DEFINE_PROP_STRING("devno", VirtioCcwDevice, bus_id),
1410     DEFINE_PROP_BIT("ioeventfd", VirtioCcwDevice, flags,
1411                     VIRTIO_CCW_FLAG_USE_IOEVENTFD_BIT, true),
1412     DEFINE_PROP_END_OF_LIST(),
1413 };
1414 
1415 static void virtio_ccw_blk_class_init(ObjectClass *klass, void *data)
1416 {
1417     DeviceClass *dc = DEVICE_CLASS(klass);
1418     VirtIOCCWDeviceClass *k = VIRTIO_CCW_DEVICE_CLASS(klass);
1419 
1420     k->init = virtio_ccw_blk_init;
1421     k->exit = virtio_ccw_exit;
1422     dc->reset = virtio_ccw_reset;
1423     dc->props = virtio_ccw_blk_properties;
1424 }
1425 
1426 static const TypeInfo virtio_ccw_blk = {
1427     .name          = TYPE_VIRTIO_BLK_CCW,
1428     .parent        = TYPE_VIRTIO_CCW_DEVICE,
1429     .instance_size = sizeof(VirtIOBlkCcw),
1430     .instance_init = virtio_ccw_blk_instance_init,
1431     .class_init    = virtio_ccw_blk_class_init,
1432 };
1433 
1434 static Property virtio_ccw_serial_properties[] = {
1435     DEFINE_PROP_STRING("devno", VirtioCcwDevice, bus_id),
1436     DEFINE_PROP_BIT("ioeventfd", VirtioCcwDevice, flags,
1437                     VIRTIO_CCW_FLAG_USE_IOEVENTFD_BIT, true),
1438     DEFINE_PROP_END_OF_LIST(),
1439 };
1440 
1441 static void virtio_ccw_serial_class_init(ObjectClass *klass, void *data)
1442 {
1443     DeviceClass *dc = DEVICE_CLASS(klass);
1444     VirtIOCCWDeviceClass *k = VIRTIO_CCW_DEVICE_CLASS(klass);
1445 
1446     k->init = virtio_ccw_serial_init;
1447     k->exit = virtio_ccw_exit;
1448     dc->reset = virtio_ccw_reset;
1449     dc->props = virtio_ccw_serial_properties;
1450 }
1451 
1452 static const TypeInfo virtio_ccw_serial = {
1453     .name          = TYPE_VIRTIO_SERIAL_CCW,
1454     .parent        = TYPE_VIRTIO_CCW_DEVICE,
1455     .instance_size = sizeof(VirtioSerialCcw),
1456     .instance_init = virtio_ccw_serial_instance_init,
1457     .class_init    = virtio_ccw_serial_class_init,
1458 };
1459 
1460 static Property virtio_ccw_balloon_properties[] = {
1461     DEFINE_PROP_STRING("devno", VirtioCcwDevice, bus_id),
1462     DEFINE_PROP_BIT("ioeventfd", VirtioCcwDevice, flags,
1463                     VIRTIO_CCW_FLAG_USE_IOEVENTFD_BIT, true),
1464     DEFINE_PROP_END_OF_LIST(),
1465 };
1466 
1467 static void virtio_ccw_balloon_class_init(ObjectClass *klass, void *data)
1468 {
1469     DeviceClass *dc = DEVICE_CLASS(klass);
1470     VirtIOCCWDeviceClass *k = VIRTIO_CCW_DEVICE_CLASS(klass);
1471 
1472     k->init = virtio_ccw_balloon_init;
1473     k->exit = virtio_ccw_exit;
1474     dc->reset = virtio_ccw_reset;
1475     dc->props = virtio_ccw_balloon_properties;
1476 }
1477 
1478 static const TypeInfo virtio_ccw_balloon = {
1479     .name          = TYPE_VIRTIO_BALLOON_CCW,
1480     .parent        = TYPE_VIRTIO_CCW_DEVICE,
1481     .instance_size = sizeof(VirtIOBalloonCcw),
1482     .instance_init = virtio_ccw_balloon_instance_init,
1483     .class_init    = virtio_ccw_balloon_class_init,
1484 };
1485 
1486 static Property virtio_ccw_scsi_properties[] = {
1487     DEFINE_PROP_STRING("devno", VirtioCcwDevice, bus_id),
1488     DEFINE_VIRTIO_SCSI_FEATURES(VirtioCcwDevice, host_features[0]),
1489     DEFINE_PROP_BIT("ioeventfd", VirtioCcwDevice, flags,
1490                     VIRTIO_CCW_FLAG_USE_IOEVENTFD_BIT, true),
1491     DEFINE_PROP_END_OF_LIST(),
1492 };
1493 
1494 static void virtio_ccw_scsi_class_init(ObjectClass *klass, void *data)
1495 {
1496     DeviceClass *dc = DEVICE_CLASS(klass);
1497     VirtIOCCWDeviceClass *k = VIRTIO_CCW_DEVICE_CLASS(klass);
1498 
1499     k->init = virtio_ccw_scsi_init;
1500     k->exit = virtio_ccw_exit;
1501     dc->reset = virtio_ccw_reset;
1502     dc->props = virtio_ccw_scsi_properties;
1503 }
1504 
1505 static const TypeInfo virtio_ccw_scsi = {
1506     .name          = TYPE_VIRTIO_SCSI_CCW,
1507     .parent        = TYPE_VIRTIO_CCW_DEVICE,
1508     .instance_size = sizeof(VirtIOSCSICcw),
1509     .instance_init = virtio_ccw_scsi_instance_init,
1510     .class_init    = virtio_ccw_scsi_class_init,
1511 };
1512 
1513 #ifdef CONFIG_VHOST_SCSI
1514 static Property vhost_ccw_scsi_properties[] = {
1515     DEFINE_PROP_STRING("devno", VirtioCcwDevice, bus_id),
1516     DEFINE_PROP_END_OF_LIST(),
1517 };
1518 
1519 static void vhost_ccw_scsi_class_init(ObjectClass *klass, void *data)
1520 {
1521     DeviceClass *dc = DEVICE_CLASS(klass);
1522     VirtIOCCWDeviceClass *k = VIRTIO_CCW_DEVICE_CLASS(klass);
1523 
1524     k->init = vhost_ccw_scsi_init;
1525     k->exit = virtio_ccw_exit;
1526     dc->reset = virtio_ccw_reset;
1527     dc->props = vhost_ccw_scsi_properties;
1528 }
1529 
1530 static const TypeInfo vhost_ccw_scsi = {
1531     .name          = TYPE_VHOST_SCSI_CCW,
1532     .parent        = TYPE_VIRTIO_CCW_DEVICE,
1533     .instance_size = sizeof(VHostSCSICcw),
1534     .instance_init = vhost_ccw_scsi_instance_init,
1535     .class_init    = vhost_ccw_scsi_class_init,
1536 };
1537 #endif
1538 
1539 static void virtio_ccw_rng_instance_init(Object *obj)
1540 {
1541     VirtIORNGCcw *dev = VIRTIO_RNG_CCW(obj);
1542 
1543     virtio_instance_init_common(obj, &dev->vdev, sizeof(dev->vdev),
1544                                 TYPE_VIRTIO_RNG);
1545     object_property_add_alias(obj, "rng", OBJECT(&dev->vdev),
1546                               "rng", &error_abort);
1547 }
1548 
1549 static Property virtio_ccw_rng_properties[] = {
1550     DEFINE_PROP_STRING("devno", VirtioCcwDevice, bus_id),
1551     DEFINE_PROP_BIT("ioeventfd", VirtioCcwDevice, flags,
1552                     VIRTIO_CCW_FLAG_USE_IOEVENTFD_BIT, true),
1553     DEFINE_PROP_END_OF_LIST(),
1554 };
1555 
1556 static void virtio_ccw_rng_class_init(ObjectClass *klass, void *data)
1557 {
1558     DeviceClass *dc = DEVICE_CLASS(klass);
1559     VirtIOCCWDeviceClass *k = VIRTIO_CCW_DEVICE_CLASS(klass);
1560 
1561     k->init = virtio_ccw_rng_init;
1562     k->exit = virtio_ccw_exit;
1563     dc->reset = virtio_ccw_reset;
1564     dc->props = virtio_ccw_rng_properties;
1565 }
1566 
1567 static const TypeInfo virtio_ccw_rng = {
1568     .name          = TYPE_VIRTIO_RNG_CCW,
1569     .parent        = TYPE_VIRTIO_CCW_DEVICE,
1570     .instance_size = sizeof(VirtIORNGCcw),
1571     .instance_init = virtio_ccw_rng_instance_init,
1572     .class_init    = virtio_ccw_rng_class_init,
1573 };
1574 
1575 static int virtio_ccw_busdev_init(DeviceState *dev)
1576 {
1577     VirtioCcwDevice *_dev = (VirtioCcwDevice *)dev;
1578     VirtIOCCWDeviceClass *_info = VIRTIO_CCW_DEVICE_GET_CLASS(dev);
1579 
1580     virtio_ccw_bus_new(&_dev->bus, sizeof(_dev->bus), _dev);
1581 
1582     return _info->init(_dev);
1583 }
1584 
1585 static int virtio_ccw_busdev_exit(DeviceState *dev)
1586 {
1587     VirtioCcwDevice *_dev = (VirtioCcwDevice *)dev;
1588     VirtIOCCWDeviceClass *_info = VIRTIO_CCW_DEVICE_GET_CLASS(dev);
1589 
1590     return _info->exit(_dev);
1591 }
1592 
1593 static void virtio_ccw_busdev_unplug(HotplugHandler *hotplug_dev,
1594                                      DeviceState *dev, Error **errp)
1595 {
1596     VirtioCcwDevice *_dev = (VirtioCcwDevice *)dev;
1597     SubchDev *sch = _dev->sch;
1598 
1599     virtio_ccw_stop_ioeventfd(_dev);
1600 
1601     /*
1602      * We should arrive here only for device_del, since we don't support
1603      * direct hot(un)plug of channels, but only through virtio.
1604      */
1605     assert(sch != NULL);
1606     /* Subchannel is now disabled and no longer valid. */
1607     sch->curr_status.pmcw.flags &= ~(PMCW_FLAGS_MASK_ENA |
1608                                      PMCW_FLAGS_MASK_DNV);
1609 
1610     css_generate_sch_crws(sch->cssid, sch->ssid, sch->schid, 1, 0);
1611 
1612     object_unparent(OBJECT(dev));
1613 }
1614 
1615 static Property virtio_ccw_properties[] = {
1616     DEFINE_VIRTIO_COMMON_FEATURES(VirtioCcwDevice, host_features[0]),
1617     DEFINE_PROP_END_OF_LIST(),
1618 };
1619 
1620 static void virtio_ccw_device_class_init(ObjectClass *klass, void *data)
1621 {
1622     DeviceClass *dc = DEVICE_CLASS(klass);
1623 
1624     dc->props = virtio_ccw_properties;
1625     dc->init = virtio_ccw_busdev_init;
1626     dc->exit = virtio_ccw_busdev_exit;
1627     dc->bus_type = TYPE_VIRTUAL_CSS_BUS;
1628 }
1629 
1630 static const TypeInfo virtio_ccw_device_info = {
1631     .name = TYPE_VIRTIO_CCW_DEVICE,
1632     .parent = TYPE_DEVICE,
1633     .instance_size = sizeof(VirtioCcwDevice),
1634     .class_init = virtio_ccw_device_class_init,
1635     .class_size = sizeof(VirtIOCCWDeviceClass),
1636     .abstract = true,
1637 };
1638 
1639 /***************** Virtual-css Bus Bridge Device ********************/
1640 /* Only required to have the virtio bus as child in the system bus */
1641 
1642 static int virtual_css_bridge_init(SysBusDevice *dev)
1643 {
1644     /* nothing */
1645     return 0;
1646 }
1647 
1648 static void virtual_css_bridge_class_init(ObjectClass *klass, void *data)
1649 {
1650     SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
1651     HotplugHandlerClass *hc = HOTPLUG_HANDLER_CLASS(klass);
1652 
1653     k->init = virtual_css_bridge_init;
1654     hc->unplug = virtio_ccw_busdev_unplug;
1655 }
1656 
1657 static const TypeInfo virtual_css_bridge_info = {
1658     .name          = "virtual-css-bridge",
1659     .parent        = TYPE_SYS_BUS_DEVICE,
1660     .instance_size = sizeof(SysBusDevice),
1661     .class_init    = virtual_css_bridge_class_init,
1662     .interfaces = (InterfaceInfo[]) {
1663         { TYPE_HOTPLUG_HANDLER },
1664         { }
1665     }
1666 };
1667 
1668 /* virtio-ccw-bus */
1669 
1670 static void virtio_ccw_bus_new(VirtioBusState *bus, size_t bus_size,
1671                                VirtioCcwDevice *dev)
1672 {
1673     DeviceState *qdev = DEVICE(dev);
1674     char virtio_bus_name[] = "virtio-bus";
1675 
1676     qbus_create_inplace(bus, bus_size, TYPE_VIRTIO_CCW_BUS,
1677                         qdev, virtio_bus_name);
1678 }
1679 
1680 static void virtio_ccw_bus_class_init(ObjectClass *klass, void *data)
1681 {
1682     VirtioBusClass *k = VIRTIO_BUS_CLASS(klass);
1683     BusClass *bus_class = BUS_CLASS(klass);
1684 
1685     bus_class->max_dev = 1;
1686     k->notify = virtio_ccw_notify;
1687     k->get_features = virtio_ccw_get_features;
1688     k->vmstate_change = virtio_ccw_vmstate_change;
1689     k->query_guest_notifiers = virtio_ccw_query_guest_notifiers;
1690     k->set_host_notifier = virtio_ccw_set_host_notifier;
1691     k->set_guest_notifiers = virtio_ccw_set_guest_notifiers;
1692     k->save_queue = virtio_ccw_save_queue;
1693     k->load_queue = virtio_ccw_load_queue;
1694     k->save_config = virtio_ccw_save_config;
1695     k->load_config = virtio_ccw_load_config;
1696 }
1697 
1698 static const TypeInfo virtio_ccw_bus_info = {
1699     .name = TYPE_VIRTIO_CCW_BUS,
1700     .parent = TYPE_VIRTIO_BUS,
1701     .instance_size = sizeof(VirtioCcwBusState),
1702     .class_init = virtio_ccw_bus_class_init,
1703 };
1704 
1705 static void virtio_ccw_register(void)
1706 {
1707     type_register_static(&virtio_ccw_bus_info);
1708     type_register_static(&virtual_css_bus_info);
1709     type_register_static(&virtio_ccw_device_info);
1710     type_register_static(&virtio_ccw_serial);
1711     type_register_static(&virtio_ccw_blk);
1712     type_register_static(&virtio_ccw_net);
1713     type_register_static(&virtio_ccw_balloon);
1714     type_register_static(&virtio_ccw_scsi);
1715 #ifdef CONFIG_VHOST_SCSI
1716     type_register_static(&vhost_ccw_scsi);
1717 #endif
1718     type_register_static(&virtio_ccw_rng);
1719     type_register_static(&virtual_css_bridge_info);
1720 }
1721 
1722 type_init(virtio_ccw_register)
1723