xref: /openbmc/qemu/hw/vfio/ccw.c (revision 8b8705e7)
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 CONFIG_DEVICES /* CONFIG_IOMMUFD */
19 #include <linux/vfio.h>
20 #include <linux/vfio_ccw.h>
21 #include <sys/ioctl.h>
22 
23 #include "qapi/error.h"
24 #include "hw/vfio/vfio-common.h"
25 #include "sysemu/iommufd.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     EventNotifier req_notifier;
53     bool force_orb_pfch;
54     bool warned_orb_pfch;
55 };
56 
warn_once_pfch(VFIOCCWDevice * vcdev,SubchDev * sch,const char * msg)57 static inline void warn_once_pfch(VFIOCCWDevice *vcdev, SubchDev *sch,
58                                   const char *msg)
59 {
60     warn_report_once_cond(&vcdev->warned_orb_pfch,
61                           "vfio-ccw (devno %x.%x.%04x): %s",
62                           sch->cssid, sch->ssid, sch->devno, msg);
63 }
64 
vfio_ccw_compute_needs_reset(VFIODevice * vdev)65 static void vfio_ccw_compute_needs_reset(VFIODevice *vdev)
66 {
67     vdev->needs_reset = false;
68 }
69 
70 /*
71  * We don't need vfio_hot_reset_multi and vfio_eoi operations for
72  * vfio_ccw device now.
73  */
74 struct VFIODeviceOps vfio_ccw_ops = {
75     .vfio_compute_needs_reset = vfio_ccw_compute_needs_reset,
76 };
77 
vfio_ccw_handle_request(SubchDev * sch)78 static IOInstEnding vfio_ccw_handle_request(SubchDev *sch)
79 {
80     VFIOCCWDevice *vcdev = VFIO_CCW(sch->driver_data);
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 ? -errno : -EFAULT;
107     } else {
108         ret = 0;
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 
vfio_ccw_handle_store(SubchDev * sch)126 static IOInstEnding vfio_ccw_handle_store(SubchDev *sch)
127 {
128     VFIOCCWDevice *vcdev = VFIO_CCW(sch->driver_data);
129     SCHIB *schib = &sch->curr_status;
130     struct ccw_schib_region *region = vcdev->schib_region;
131     SCHIB *s;
132     int ret;
133 
134     /* schib region not available so nothing else to do */
135     if (!region) {
136         return IOINST_CC_EXPECTED;
137     }
138 
139     memset(region, 0, sizeof(*region));
140     ret = pread(vcdev->vdev.fd, region, vcdev->schib_region_size,
141                 vcdev->schib_region_offset);
142 
143     if (ret == -1) {
144         /*
145          * Device is probably damaged, but store subchannel does not
146          * have a nonzero cc defined for this scenario.  Log an error,
147          * and presume things are otherwise fine.
148          */
149         error_report("vfio-ccw: store region read failed with errno=%d", errno);
150         return IOINST_CC_EXPECTED;
151     }
152 
153     /*
154      * Selectively copy path-related bits of the SCHIB,
155      * rather than copying the entire struct.
156      */
157     s = (SCHIB *)region->schib_area;
158     schib->pmcw.pnom = s->pmcw.pnom;
159     schib->pmcw.lpum = s->pmcw.lpum;
160     schib->pmcw.pam = s->pmcw.pam;
161     schib->pmcw.pom = s->pmcw.pom;
162 
163     if (s->scsw.flags & SCSW_FLAGS_MASK_PNO) {
164         schib->scsw.flags |= SCSW_FLAGS_MASK_PNO;
165     }
166 
167     return IOINST_CC_EXPECTED;
168 }
169 
vfio_ccw_handle_clear(SubchDev * sch)170 static int vfio_ccw_handle_clear(SubchDev *sch)
171 {
172     VFIOCCWDevice *vcdev = VFIO_CCW(sch->driver_data);
173     struct ccw_cmd_region *region = vcdev->async_cmd_region;
174     int ret;
175 
176     if (!vcdev->async_cmd_region) {
177         /* Async command region not available, fall back to emulation */
178         return -ENOSYS;
179     }
180 
181     memset(region, 0, sizeof(*region));
182     region->command = VFIO_CCW_ASYNC_CMD_CSCH;
183 
184 again:
185     ret = pwrite(vcdev->vdev.fd, region,
186                  vcdev->async_cmd_region_size, vcdev->async_cmd_region_offset);
187     if (ret != vcdev->async_cmd_region_size) {
188         if (errno == EAGAIN) {
189             goto again;
190         }
191         error_report("vfio-ccw: write cmd region failed with errno=%d", errno);
192         ret = errno ? -errno : -EFAULT;
193     } else {
194         ret = 0;
195     }
196     switch (ret) {
197     case 0:
198     case -ENODEV:
199     case -EACCES:
200         return ret;
201     case -EFAULT:
202     default:
203         sch_gen_unit_exception(sch);
204         css_inject_io_interrupt(sch);
205         return 0;
206     }
207 }
208 
vfio_ccw_handle_halt(SubchDev * sch)209 static int vfio_ccw_handle_halt(SubchDev *sch)
210 {
211     VFIOCCWDevice *vcdev = VFIO_CCW(sch->driver_data);
212     struct ccw_cmd_region *region = vcdev->async_cmd_region;
213     int ret;
214 
215     if (!vcdev->async_cmd_region) {
216         /* Async command region not available, fall back to emulation */
217         return -ENOSYS;
218     }
219 
220     memset(region, 0, sizeof(*region));
221     region->command = VFIO_CCW_ASYNC_CMD_HSCH;
222 
223 again:
224     ret = pwrite(vcdev->vdev.fd, region,
225                  vcdev->async_cmd_region_size, vcdev->async_cmd_region_offset);
226     if (ret != vcdev->async_cmd_region_size) {
227         if (errno == EAGAIN) {
228             goto again;
229         }
230         error_report("vfio-ccw: write cmd region failed with errno=%d", errno);
231         ret = errno ? -errno : -EFAULT;
232     } else {
233         ret = 0;
234     }
235     switch (ret) {
236     case 0:
237     case -EBUSY:
238     case -ENODEV:
239     case -EACCES:
240         return ret;
241     case -EFAULT:
242     default:
243         sch_gen_unit_exception(sch);
244         css_inject_io_interrupt(sch);
245         return 0;
246     }
247 }
248 
vfio_ccw_reset(DeviceState * dev)249 static void vfio_ccw_reset(DeviceState *dev)
250 {
251     VFIOCCWDevice *vcdev = VFIO_CCW(dev);
252 
253     ioctl(vcdev->vdev.fd, VFIO_DEVICE_RESET);
254 }
255 
vfio_ccw_crw_read(VFIOCCWDevice * vcdev)256 static void vfio_ccw_crw_read(VFIOCCWDevice *vcdev)
257 {
258     struct ccw_crw_region *region = vcdev->crw_region;
259     CRW crw;
260     int size;
261 
262     /* Keep reading CRWs as long as data is returned */
263     do {
264         memset(region, 0, sizeof(*region));
265         size = pread(vcdev->vdev.fd, region, vcdev->crw_region_size,
266                      vcdev->crw_region_offset);
267 
268         if (size == -1) {
269             error_report("vfio-ccw: Read crw region failed with errno=%d",
270                          errno);
271             break;
272         }
273 
274         if (region->crw == 0) {
275             /* No more CRWs to queue */
276             break;
277         }
278 
279         memcpy(&crw, &region->crw, sizeof(CRW));
280 
281         css_crw_add_to_queue(crw);
282     } while (1);
283 }
284 
vfio_ccw_req_notifier_handler(void * opaque)285 static void vfio_ccw_req_notifier_handler(void *opaque)
286 {
287     VFIOCCWDevice *vcdev = opaque;
288     Error *err = NULL;
289 
290     if (!event_notifier_test_and_clear(&vcdev->req_notifier)) {
291         return;
292     }
293 
294     qdev_unplug(DEVICE(vcdev), &err);
295     if (err) {
296         warn_reportf_err(err, VFIO_MSG_PREFIX, vcdev->vdev.name);
297     }
298 }
299 
vfio_ccw_crw_notifier_handler(void * opaque)300 static void vfio_ccw_crw_notifier_handler(void *opaque)
301 {
302     VFIOCCWDevice *vcdev = opaque;
303 
304     while (event_notifier_test_and_clear(&vcdev->crw_notifier)) {
305         vfio_ccw_crw_read(vcdev);
306     }
307 }
308 
vfio_ccw_io_notifier_handler(void * opaque)309 static void vfio_ccw_io_notifier_handler(void *opaque)
310 {
311     VFIOCCWDevice *vcdev = opaque;
312     struct ccw_io_region *region = vcdev->io_region;
313     CcwDevice *ccw_dev = CCW_DEVICE(vcdev);
314     SubchDev *sch = ccw_dev->sch;
315     SCHIB *schib = &sch->curr_status;
316     SCSW s;
317     IRB irb;
318     ESW esw;
319     int size;
320 
321     if (!event_notifier_test_and_clear(&vcdev->io_notifier)) {
322         return;
323     }
324 
325     size = pread(vcdev->vdev.fd, region, vcdev->io_region_size,
326                  vcdev->io_region_offset);
327     if (size == -1) {
328         switch (errno) {
329         case ENODEV:
330             /* Generate a deferred cc 3 condition. */
331             schib->scsw.flags |= SCSW_FLAGS_MASK_CC;
332             schib->scsw.ctrl &= ~SCSW_CTRL_MASK_STCTL;
333             schib->scsw.ctrl |= (SCSW_STCTL_ALERT | SCSW_STCTL_STATUS_PEND);
334             goto read_err;
335         case EFAULT:
336             /* Memory problem, generate channel data check. */
337             schib->scsw.ctrl &= ~SCSW_ACTL_START_PEND;
338             schib->scsw.cstat = SCSW_CSTAT_DATA_CHECK;
339             schib->scsw.ctrl &= ~SCSW_CTRL_MASK_STCTL;
340             schib->scsw.ctrl |= SCSW_STCTL_PRIMARY | SCSW_STCTL_SECONDARY |
341                        SCSW_STCTL_ALERT | SCSW_STCTL_STATUS_PEND;
342             goto read_err;
343         default:
344             /* Error, generate channel program check. */
345             schib->scsw.ctrl &= ~SCSW_ACTL_START_PEND;
346             schib->scsw.cstat = SCSW_CSTAT_PROG_CHECK;
347             schib->scsw.ctrl &= ~SCSW_CTRL_MASK_STCTL;
348             schib->scsw.ctrl |= SCSW_STCTL_PRIMARY | SCSW_STCTL_SECONDARY |
349                        SCSW_STCTL_ALERT | SCSW_STCTL_STATUS_PEND;
350             goto read_err;
351         }
352     } else if (size != vcdev->io_region_size) {
353         /* Information transfer error, generate channel-control check. */
354         schib->scsw.ctrl &= ~SCSW_ACTL_START_PEND;
355         schib->scsw.cstat = SCSW_CSTAT_CHN_CTRL_CHK;
356         schib->scsw.ctrl &= ~SCSW_CTRL_MASK_STCTL;
357         schib->scsw.ctrl |= SCSW_STCTL_PRIMARY | SCSW_STCTL_SECONDARY |
358                    SCSW_STCTL_ALERT | SCSW_STCTL_STATUS_PEND;
359         goto read_err;
360     }
361 
362     memcpy(&irb, region->irb_area, sizeof(IRB));
363 
364     /* Update control block via irb. */
365     s = schib->scsw;
366     copy_scsw_to_guest(&s, &irb.scsw);
367     schib->scsw = s;
368 
369     copy_esw_to_guest(&esw, &irb.esw);
370     sch->esw = esw;
371 
372     /* If a uint check is pending, copy sense data. */
373     if ((schib->scsw.dstat & SCSW_DSTAT_UNIT_CHECK) &&
374         (schib->pmcw.chars & PMCW_CHARS_MASK_CSENSE)) {
375         memcpy(sch->sense_data, irb.ecw, sizeof(irb.ecw));
376     }
377 
378 read_err:
379     css_inject_io_interrupt(sch);
380 }
381 
vfio_ccw_register_irq_notifier(VFIOCCWDevice * vcdev,unsigned int irq,Error ** errp)382 static bool vfio_ccw_register_irq_notifier(VFIOCCWDevice *vcdev,
383                                            unsigned int irq,
384                                            Error **errp)
385 {
386     VFIODevice *vdev = &vcdev->vdev;
387     g_autofree struct vfio_irq_info *irq_info = NULL;
388     size_t argsz;
389     int fd;
390     EventNotifier *notifier;
391     IOHandler *fd_read;
392 
393     switch (irq) {
394     case VFIO_CCW_IO_IRQ_INDEX:
395         notifier = &vcdev->io_notifier;
396         fd_read = vfio_ccw_io_notifier_handler;
397         break;
398     case VFIO_CCW_CRW_IRQ_INDEX:
399         notifier = &vcdev->crw_notifier;
400         fd_read = vfio_ccw_crw_notifier_handler;
401         break;
402     case VFIO_CCW_REQ_IRQ_INDEX:
403         notifier = &vcdev->req_notifier;
404         fd_read = vfio_ccw_req_notifier_handler;
405         break;
406     default:
407         error_setg(errp, "vfio: Unsupported device irq(%d)", irq);
408         return false;
409     }
410 
411     if (vdev->num_irqs < irq + 1) {
412         error_setg(errp, "vfio: IRQ %u not available (number of irqs %u)",
413                    irq, vdev->num_irqs);
414         return false;
415     }
416 
417     argsz = sizeof(*irq_info);
418     irq_info = g_malloc0(argsz);
419     irq_info->index = irq;
420     irq_info->argsz = argsz;
421     if (ioctl(vdev->fd, VFIO_DEVICE_GET_IRQ_INFO,
422               irq_info) < 0 || irq_info->count < 1) {
423         error_setg_errno(errp, errno, "vfio: Error getting irq info");
424         return false;
425     }
426 
427     if (event_notifier_init(notifier, 0)) {
428         error_setg_errno(errp, errno,
429                          "vfio: Unable to init event notifier for irq (%d)",
430                          irq);
431         return false;
432     }
433 
434     fd = event_notifier_get_fd(notifier);
435     qemu_set_fd_handler(fd, fd_read, NULL, vcdev);
436 
437     if (!vfio_set_irq_signaling(vdev, irq, 0,
438                                 VFIO_IRQ_SET_ACTION_TRIGGER, fd, errp)) {
439         qemu_set_fd_handler(fd, NULL, NULL, vcdev);
440         event_notifier_cleanup(notifier);
441     }
442 
443     return true;
444 }
445 
vfio_ccw_unregister_irq_notifier(VFIOCCWDevice * vcdev,unsigned int irq)446 static void vfio_ccw_unregister_irq_notifier(VFIOCCWDevice *vcdev,
447                                              unsigned int irq)
448 {
449     Error *err = NULL;
450     EventNotifier *notifier;
451 
452     switch (irq) {
453     case VFIO_CCW_IO_IRQ_INDEX:
454         notifier = &vcdev->io_notifier;
455         break;
456     case VFIO_CCW_CRW_IRQ_INDEX:
457         notifier = &vcdev->crw_notifier;
458         break;
459     case VFIO_CCW_REQ_IRQ_INDEX:
460         notifier = &vcdev->req_notifier;
461         break;
462     default:
463         error_report("vfio: Unsupported device irq(%d)", irq);
464         return;
465     }
466 
467     if (!vfio_set_irq_signaling(&vcdev->vdev, irq, 0,
468                                 VFIO_IRQ_SET_ACTION_TRIGGER, -1, &err)) {
469         warn_reportf_err(err, VFIO_MSG_PREFIX, vcdev->vdev.name);
470     }
471 
472     qemu_set_fd_handler(event_notifier_get_fd(notifier),
473                         NULL, NULL, vcdev);
474     event_notifier_cleanup(notifier);
475 }
476 
vfio_ccw_get_region(VFIOCCWDevice * vcdev,Error ** errp)477 static bool vfio_ccw_get_region(VFIOCCWDevice *vcdev, Error **errp)
478 {
479     VFIODevice *vdev = &vcdev->vdev;
480     struct vfio_region_info *info;
481     int ret;
482 
483     /* Sanity check device */
484     if (!(vdev->flags & VFIO_DEVICE_FLAGS_CCW)) {
485         error_setg(errp, "vfio: Um, this isn't a vfio-ccw device");
486         return false;
487     }
488 
489     /*
490      * We always expect at least the I/O region to be present. We also
491      * may have a variable number of regions governed by capabilities.
492      */
493     if (vdev->num_regions < VFIO_CCW_CONFIG_REGION_INDEX + 1) {
494         error_setg(errp, "vfio: too few regions (%u), expected at least %u",
495                    vdev->num_regions, VFIO_CCW_CONFIG_REGION_INDEX + 1);
496         return false;
497     }
498 
499     ret = vfio_get_region_info(vdev, VFIO_CCW_CONFIG_REGION_INDEX, &info);
500     if (ret) {
501         error_setg_errno(errp, -ret, "vfio: Error getting config info");
502         return false;
503     }
504 
505     vcdev->io_region_size = info->size;
506     if (sizeof(*vcdev->io_region) != vcdev->io_region_size) {
507         error_setg(errp, "vfio: Unexpected size of the I/O region");
508         goto out_err;
509     }
510 
511     vcdev->io_region_offset = info->offset;
512     vcdev->io_region = g_malloc0(info->size);
513     g_free(info);
514 
515     /* check for the optional async command region */
516     ret = vfio_get_dev_region_info(vdev, VFIO_REGION_TYPE_CCW,
517                                    VFIO_REGION_SUBTYPE_CCW_ASYNC_CMD, &info);
518     if (!ret) {
519         vcdev->async_cmd_region_size = info->size;
520         if (sizeof(*vcdev->async_cmd_region) != vcdev->async_cmd_region_size) {
521             error_setg(errp, "vfio: Unexpected size of the async cmd region");
522             goto out_err;
523         }
524         vcdev->async_cmd_region_offset = info->offset;
525         vcdev->async_cmd_region = g_malloc0(info->size);
526         g_free(info);
527     }
528 
529     ret = vfio_get_dev_region_info(vdev, VFIO_REGION_TYPE_CCW,
530                                    VFIO_REGION_SUBTYPE_CCW_SCHIB, &info);
531     if (!ret) {
532         vcdev->schib_region_size = info->size;
533         if (sizeof(*vcdev->schib_region) != vcdev->schib_region_size) {
534             error_setg(errp, "vfio: Unexpected size of the schib region");
535             goto out_err;
536         }
537         vcdev->schib_region_offset = info->offset;
538         vcdev->schib_region = g_malloc(info->size);
539         g_free(info);
540     }
541 
542     ret = vfio_get_dev_region_info(vdev, VFIO_REGION_TYPE_CCW,
543                                    VFIO_REGION_SUBTYPE_CCW_CRW, &info);
544 
545     if (!ret) {
546         vcdev->crw_region_size = info->size;
547         if (sizeof(*vcdev->crw_region) != vcdev->crw_region_size) {
548             error_setg(errp, "vfio: Unexpected size of the CRW region");
549             goto out_err;
550         }
551         vcdev->crw_region_offset = info->offset;
552         vcdev->crw_region = g_malloc(info->size);
553         g_free(info);
554     }
555 
556     return true;
557 
558 out_err:
559     g_free(vcdev->crw_region);
560     g_free(vcdev->schib_region);
561     g_free(vcdev->async_cmd_region);
562     g_free(vcdev->io_region);
563     g_free(info);
564     return false;
565 }
566 
vfio_ccw_put_region(VFIOCCWDevice * vcdev)567 static void vfio_ccw_put_region(VFIOCCWDevice *vcdev)
568 {
569     g_free(vcdev->crw_region);
570     g_free(vcdev->schib_region);
571     g_free(vcdev->async_cmd_region);
572     g_free(vcdev->io_region);
573 }
574 
vfio_ccw_realize(DeviceState * dev,Error ** errp)575 static void vfio_ccw_realize(DeviceState *dev, Error **errp)
576 {
577     S390CCWDevice *cdev = S390_CCW_DEVICE(dev);
578     VFIOCCWDevice *vcdev = VFIO_CCW(cdev);
579     S390CCWDeviceClass *cdc = S390_CCW_DEVICE_GET_CLASS(cdev);
580     VFIODevice *vbasedev = &vcdev->vdev;
581     Error *err = NULL;
582 
583     /* Call the class init function for subchannel. */
584     if (cdc->realize) {
585         if (!cdc->realize(cdev, vcdev->vdev.sysfsdev, errp)) {
586             return;
587         }
588     }
589 
590     if (!vfio_device_get_name(vbasedev, errp)) {
591         goto out_unrealize;
592     }
593 
594     if (!vfio_attach_device(cdev->mdevid, vbasedev,
595                             &address_space_memory, errp)) {
596         goto out_attach_dev_err;
597     }
598 
599     if (!vfio_ccw_get_region(vcdev, errp)) {
600         goto out_region_err;
601     }
602 
603     if (!vfio_ccw_register_irq_notifier(vcdev, VFIO_CCW_IO_IRQ_INDEX, errp)) {
604         goto out_io_notifier_err;
605     }
606 
607     if (vcdev->crw_region) {
608         if (!vfio_ccw_register_irq_notifier(vcdev, VFIO_CCW_CRW_IRQ_INDEX,
609                                             errp)) {
610             goto out_irq_notifier_err;
611         }
612     }
613 
614     if (!vfio_ccw_register_irq_notifier(vcdev, VFIO_CCW_REQ_IRQ_INDEX, &err)) {
615         /*
616          * Report this error, but do not make it a failing condition.
617          * Lack of this IRQ in the host does not prevent normal operation.
618          */
619         warn_report_err(err);
620     }
621 
622     return;
623 
624 out_irq_notifier_err:
625     vfio_ccw_unregister_irq_notifier(vcdev, VFIO_CCW_REQ_IRQ_INDEX);
626     vfio_ccw_unregister_irq_notifier(vcdev, VFIO_CCW_CRW_IRQ_INDEX);
627     vfio_ccw_unregister_irq_notifier(vcdev, VFIO_CCW_IO_IRQ_INDEX);
628 out_io_notifier_err:
629     vfio_ccw_put_region(vcdev);
630 out_region_err:
631     vfio_detach_device(vbasedev);
632 out_attach_dev_err:
633     g_free(vbasedev->name);
634 out_unrealize:
635     if (cdc->unrealize) {
636         cdc->unrealize(cdev);
637     }
638 }
639 
vfio_ccw_unrealize(DeviceState * dev)640 static void vfio_ccw_unrealize(DeviceState *dev)
641 {
642     S390CCWDevice *cdev = S390_CCW_DEVICE(dev);
643     VFIOCCWDevice *vcdev = VFIO_CCW(cdev);
644     S390CCWDeviceClass *cdc = S390_CCW_DEVICE_GET_CLASS(cdev);
645 
646     vfio_ccw_unregister_irq_notifier(vcdev, VFIO_CCW_REQ_IRQ_INDEX);
647     vfio_ccw_unregister_irq_notifier(vcdev, VFIO_CCW_CRW_IRQ_INDEX);
648     vfio_ccw_unregister_irq_notifier(vcdev, VFIO_CCW_IO_IRQ_INDEX);
649     vfio_ccw_put_region(vcdev);
650     vfio_detach_device(&vcdev->vdev);
651     g_free(vcdev->vdev.name);
652 
653     if (cdc->unrealize) {
654         cdc->unrealize(cdev);
655     }
656 }
657 
658 static Property vfio_ccw_properties[] = {
659     DEFINE_PROP_STRING("sysfsdev", VFIOCCWDevice, vdev.sysfsdev),
660     DEFINE_PROP_BOOL("force-orb-pfch", VFIOCCWDevice, force_orb_pfch, false),
661 #ifdef CONFIG_IOMMUFD
662     DEFINE_PROP_LINK("iommufd", VFIOCCWDevice, vdev.iommufd,
663                      TYPE_IOMMUFD_BACKEND, IOMMUFDBackend *),
664 #endif
665     DEFINE_PROP_END_OF_LIST(),
666 };
667 
668 static const VMStateDescription vfio_ccw_vmstate = {
669     .name = "vfio-ccw",
670     .unmigratable = 1,
671 };
672 
vfio_ccw_instance_init(Object * obj)673 static void vfio_ccw_instance_init(Object *obj)
674 {
675     VFIOCCWDevice *vcdev = VFIO_CCW(obj);
676     VFIODevice *vbasedev = &vcdev->vdev;
677 
678     /* CCW device is mdev type device */
679     vbasedev->mdev = true;
680 
681     /*
682      * All vfio-ccw devices are believed to operate in a way compatible with
683      * discarding of memory in RAM blocks, ie. pages pinned in the host are
684      * in the current working set of the guest driver and therefore never
685      * overlap e.g., with pages available to the guest balloon driver.  This
686      * needs to be set before vfio_get_device() for vfio common to handle
687      * ram_block_discard_disable().
688      */
689     vfio_device_init(vbasedev, VFIO_DEVICE_TYPE_CCW, &vfio_ccw_ops,
690                      DEVICE(vcdev), true);
691 }
692 
693 #ifdef CONFIG_IOMMUFD
vfio_ccw_set_fd(Object * obj,const char * str,Error ** errp)694 static void vfio_ccw_set_fd(Object *obj, const char *str, Error **errp)
695 {
696     vfio_device_set_fd(&VFIO_CCW(obj)->vdev, str, errp);
697 }
698 #endif
699 
vfio_ccw_class_init(ObjectClass * klass,void * data)700 static void vfio_ccw_class_init(ObjectClass *klass, void *data)
701 {
702     DeviceClass *dc = DEVICE_CLASS(klass);
703     S390CCWDeviceClass *cdc = S390_CCW_DEVICE_CLASS(klass);
704 
705     device_class_set_props(dc, vfio_ccw_properties);
706 #ifdef CONFIG_IOMMUFD
707     object_class_property_add_str(klass, "fd", NULL, vfio_ccw_set_fd);
708 #endif
709     dc->vmsd = &vfio_ccw_vmstate;
710     dc->desc = "VFIO-based subchannel assignment";
711     set_bit(DEVICE_CATEGORY_MISC, dc->categories);
712     dc->realize = vfio_ccw_realize;
713     dc->unrealize = vfio_ccw_unrealize;
714     dc->reset = vfio_ccw_reset;
715 
716     cdc->handle_request = vfio_ccw_handle_request;
717     cdc->handle_halt = vfio_ccw_handle_halt;
718     cdc->handle_clear = vfio_ccw_handle_clear;
719     cdc->handle_store = vfio_ccw_handle_store;
720 }
721 
722 static const TypeInfo vfio_ccw_info = {
723     .name = TYPE_VFIO_CCW,
724     .parent = TYPE_S390_CCW,
725     .instance_size = sizeof(VFIOCCWDevice),
726     .instance_init = vfio_ccw_instance_init,
727     .class_init = vfio_ccw_class_init,
728 };
729 
register_vfio_ccw_type(void)730 static void register_vfio_ccw_type(void)
731 {
732     type_register_static(&vfio_ccw_info);
733 }
734 
735 type_init(register_vfio_ccw_type)
736