qtest/npcm7xx_pwm-test: Fix memleak in pwm_qom_get
[qemu/ar7.git] / hw / block / xen-block.c
blob718d886e5cdfc23b3f4be76df432b7fb859f0c0b
1 /*
2 * Copyright (c) 2018 Citrix Systems Inc.
4 * This work is licensed under the terms of the GNU GPL, version 2 or later.
5 * See the COPYING file in the top-level directory.
6 */
8 #include "qemu/osdep.h"
9 #include "qemu/cutils.h"
10 #include "qemu/main-loop.h"
11 #include "qemu/module.h"
12 #include "qemu/option.h"
13 #include "qapi/error.h"
14 #include "qapi/qapi-commands-block-core.h"
15 #include "qapi/qapi-commands-qom.h"
16 #include "qapi/qapi-visit-block-core.h"
17 #include "qapi/qobject-input-visitor.h"
18 #include "qapi/visitor.h"
19 #include "qapi/qmp/qdict.h"
20 #include "qapi/qmp/qstring.h"
21 #include "qom/object_interfaces.h"
22 #include "hw/xen/xen_common.h"
23 #include "hw/block/xen_blkif.h"
24 #include "hw/qdev-properties.h"
25 #include "hw/xen/xen-block.h"
26 #include "hw/xen/xen-backend.h"
27 #include "sysemu/blockdev.h"
28 #include "sysemu/block-backend.h"
29 #include "sysemu/iothread.h"
30 #include "dataplane/xen-block.h"
31 #include "trace.h"
33 static char *xen_block_get_name(XenDevice *xendev, Error **errp)
35 XenBlockDevice *blockdev = XEN_BLOCK_DEVICE(xendev);
36 XenBlockVdev *vdev = &blockdev->props.vdev;
38 return g_strdup_printf("%lu", vdev->number);
41 static void xen_block_disconnect(XenDevice *xendev, Error **errp)
43 XenBlockDevice *blockdev = XEN_BLOCK_DEVICE(xendev);
44 const char *type = object_get_typename(OBJECT(blockdev));
45 XenBlockVdev *vdev = &blockdev->props.vdev;
47 trace_xen_block_disconnect(type, vdev->disk, vdev->partition);
49 xen_block_dataplane_stop(blockdev->dataplane);
52 static void xen_block_connect(XenDevice *xendev, Error **errp)
54 XenBlockDevice *blockdev = XEN_BLOCK_DEVICE(xendev);
55 const char *type = object_get_typename(OBJECT(blockdev));
56 XenBlockVdev *vdev = &blockdev->props.vdev;
57 BlockConf *conf = &blockdev->props.conf;
58 unsigned int feature_large_sector_size;
59 unsigned int order, nr_ring_ref, *ring_ref, event_channel, protocol;
60 char *str;
62 trace_xen_block_connect(type, vdev->disk, vdev->partition);
64 if (xen_device_frontend_scanf(xendev, "feature-large-sector-size", "%u",
65 &feature_large_sector_size) != 1) {
66 feature_large_sector_size = 0;
69 if (feature_large_sector_size != 1 &&
70 conf->logical_block_size != XEN_BLKIF_SECTOR_SIZE) {
71 error_setg(errp, "logical_block_size != %u not supported by frontend",
72 XEN_BLKIF_SECTOR_SIZE);
73 return;
76 if (xen_device_frontend_scanf(xendev, "ring-page-order", "%u",
77 &order) != 1) {
78 nr_ring_ref = 1;
79 ring_ref = g_new(unsigned int, nr_ring_ref);
81 if (xen_device_frontend_scanf(xendev, "ring-ref", "%u",
82 &ring_ref[0]) != 1) {
83 error_setg(errp, "failed to read ring-ref");
84 g_free(ring_ref);
85 return;
87 } else if (order <= blockdev->props.max_ring_page_order) {
88 unsigned int i;
90 nr_ring_ref = 1 << order;
91 ring_ref = g_new(unsigned int, nr_ring_ref);
93 for (i = 0; i < nr_ring_ref; i++) {
94 const char *key = g_strdup_printf("ring-ref%u", i);
96 if (xen_device_frontend_scanf(xendev, key, "%u",
97 &ring_ref[i]) != 1) {
98 error_setg(errp, "failed to read %s", key);
99 g_free((gpointer)key);
100 g_free(ring_ref);
101 return;
104 g_free((gpointer)key);
106 } else {
107 error_setg(errp, "invalid ring-page-order (%d)", order);
108 return;
111 if (xen_device_frontend_scanf(xendev, "event-channel", "%u",
112 &event_channel) != 1) {
113 error_setg(errp, "failed to read event-channel");
114 g_free(ring_ref);
115 return;
118 if (xen_device_frontend_scanf(xendev, "protocol", "%ms",
119 &str) != 1) {
120 protocol = BLKIF_PROTOCOL_NATIVE;
121 } else {
122 if (strcmp(str, XEN_IO_PROTO_ABI_X86_32) == 0) {
123 protocol = BLKIF_PROTOCOL_X86_32;
124 } else if (strcmp(str, XEN_IO_PROTO_ABI_X86_64) == 0) {
125 protocol = BLKIF_PROTOCOL_X86_64;
126 } else {
127 protocol = BLKIF_PROTOCOL_NATIVE;
130 free(str);
133 xen_block_dataplane_start(blockdev->dataplane, ring_ref, nr_ring_ref,
134 event_channel, protocol, errp);
136 g_free(ring_ref);
139 static void xen_block_unrealize(XenDevice *xendev)
141 XenBlockDevice *blockdev = XEN_BLOCK_DEVICE(xendev);
142 XenBlockDeviceClass *blockdev_class =
143 XEN_BLOCK_DEVICE_GET_CLASS(xendev);
144 const char *type = object_get_typename(OBJECT(blockdev));
145 XenBlockVdev *vdev = &blockdev->props.vdev;
147 if (vdev->type == XEN_BLOCK_VDEV_TYPE_INVALID) {
148 return;
151 trace_xen_block_unrealize(type, vdev->disk, vdev->partition);
153 /* Disconnect from the frontend in case this has not already happened */
154 xen_block_disconnect(xendev, NULL);
156 xen_block_dataplane_destroy(blockdev->dataplane);
157 blockdev->dataplane = NULL;
159 if (blockdev_class->unrealize) {
160 blockdev_class->unrealize(blockdev);
164 static void xen_block_set_size(XenBlockDevice *blockdev)
166 const char *type = object_get_typename(OBJECT(blockdev));
167 XenBlockVdev *vdev = &blockdev->props.vdev;
168 BlockConf *conf = &blockdev->props.conf;
169 int64_t sectors = blk_getlength(conf->blk) / conf->logical_block_size;
170 XenDevice *xendev = XEN_DEVICE(blockdev);
172 trace_xen_block_size(type, vdev->disk, vdev->partition, sectors);
174 xen_device_backend_printf(xendev, "sectors", "%"PRIi64, sectors);
177 static void xen_block_resize_cb(void *opaque)
179 XenBlockDevice *blockdev = opaque;
180 XenDevice *xendev = XEN_DEVICE(blockdev);
181 enum xenbus_state state = xen_device_backend_get_state(xendev);
183 xen_block_set_size(blockdev);
186 * Mimic the behaviour of Linux xen-blkback and re-write the state
187 * to trigger the frontend watch.
189 xen_device_backend_printf(xendev, "state", "%u", state);
192 static const BlockDevOps xen_block_dev_ops = {
193 .resize_cb = xen_block_resize_cb,
196 static void xen_block_realize(XenDevice *xendev, Error **errp)
198 ERRP_GUARD();
199 XenBlockDevice *blockdev = XEN_BLOCK_DEVICE(xendev);
200 XenBlockDeviceClass *blockdev_class =
201 XEN_BLOCK_DEVICE_GET_CLASS(xendev);
202 const char *type = object_get_typename(OBJECT(blockdev));
203 XenBlockVdev *vdev = &blockdev->props.vdev;
204 BlockConf *conf = &blockdev->props.conf;
205 BlockBackend *blk = conf->blk;
207 if (vdev->type == XEN_BLOCK_VDEV_TYPE_INVALID) {
208 error_setg(errp, "vdev property not set");
209 return;
212 trace_xen_block_realize(type, vdev->disk, vdev->partition);
214 if (blockdev_class->realize) {
215 blockdev_class->realize(blockdev, errp);
216 if (*errp) {
217 return;
222 * The blkif protocol does not deal with removable media, so it must
223 * always be present, even for CDRom devices.
225 assert(blk);
226 if (!blk_is_inserted(blk)) {
227 error_setg(errp, "device needs media, but drive is empty");
228 return;
231 if (!blkconf_apply_backend_options(conf, blockdev->info & VDISK_READONLY,
232 true, errp)) {
233 return;
236 if (!(blockdev->info & VDISK_CDROM) &&
237 !blkconf_geometry(conf, NULL, 65535, 255, 255, errp)) {
238 return;
241 if (!blkconf_blocksizes(conf, errp)) {
242 return;
245 blk_set_dev_ops(blk, &xen_block_dev_ops, blockdev);
246 blk_set_guest_block_size(blk, conf->logical_block_size);
248 if (conf->discard_granularity == -1) {
249 conf->discard_granularity = conf->physical_block_size;
252 if (blk_get_flags(blk) & BDRV_O_UNMAP) {
253 xen_device_backend_printf(xendev, "feature-discard", "%u", 1);
254 xen_device_backend_printf(xendev, "discard-granularity", "%u",
255 conf->discard_granularity);
258 xen_device_backend_printf(xendev, "feature-flush-cache", "%u", 1);
259 xen_device_backend_printf(xendev, "max-ring-page-order", "%u",
260 blockdev->props.max_ring_page_order);
261 xen_device_backend_printf(xendev, "info", "%u", blockdev->info);
263 xen_device_frontend_printf(xendev, "virtual-device", "%lu",
264 vdev->number);
265 xen_device_frontend_printf(xendev, "device-type", "%s",
266 blockdev->device_type);
268 xen_device_backend_printf(xendev, "sector-size", "%u",
269 conf->logical_block_size);
271 xen_block_set_size(blockdev);
273 blockdev->dataplane =
274 xen_block_dataplane_create(xendev, blk, conf->logical_block_size,
275 blockdev->props.iothread);
278 static void xen_block_frontend_changed(XenDevice *xendev,
279 enum xenbus_state frontend_state,
280 Error **errp)
282 ERRP_GUARD();
283 enum xenbus_state backend_state = xen_device_backend_get_state(xendev);
285 switch (frontend_state) {
286 case XenbusStateInitialised:
287 case XenbusStateConnected:
288 if (backend_state == XenbusStateConnected) {
289 break;
292 xen_block_disconnect(xendev, errp);
293 if (*errp) {
294 break;
297 xen_block_connect(xendev, errp);
298 if (*errp) {
299 break;
302 xen_device_backend_set_state(xendev, XenbusStateConnected);
303 break;
305 case XenbusStateClosing:
306 xen_device_backend_set_state(xendev, XenbusStateClosing);
307 break;
309 case XenbusStateClosed:
310 case XenbusStateUnknown:
311 xen_block_disconnect(xendev, errp);
312 if (*errp) {
313 break;
316 xen_device_backend_set_state(xendev, XenbusStateClosed);
317 break;
319 default:
320 break;
324 static char *disk_to_vbd_name(unsigned int disk)
326 char *name, *prefix = (disk >= 26) ?
327 disk_to_vbd_name((disk / 26) - 1) : g_strdup("");
329 name = g_strdup_printf("%s%c", prefix, 'a' + disk % 26);
330 g_free(prefix);
332 return name;
335 static void xen_block_get_vdev(Object *obj, Visitor *v, const char *name,
336 void *opaque, Error **errp)
338 Property *prop = opaque;
339 XenBlockVdev *vdev = object_field_prop_ptr(obj, prop);
340 char *str;
342 switch (vdev->type) {
343 case XEN_BLOCK_VDEV_TYPE_DP:
344 str = g_strdup_printf("d%lup%lu", vdev->disk, vdev->partition);
345 break;
347 case XEN_BLOCK_VDEV_TYPE_XVD:
348 case XEN_BLOCK_VDEV_TYPE_HD:
349 case XEN_BLOCK_VDEV_TYPE_SD: {
350 char *name = disk_to_vbd_name(vdev->disk);
352 str = g_strdup_printf("%s%s%lu",
353 (vdev->type == XEN_BLOCK_VDEV_TYPE_XVD) ?
354 "xvd" :
355 (vdev->type == XEN_BLOCK_VDEV_TYPE_HD) ?
356 "hd" :
357 "sd",
358 name, vdev->partition);
359 g_free(name);
360 break;
362 default:
363 error_setg(errp, "invalid vdev type");
364 return;
367 visit_type_str(v, name, &str, errp);
368 g_free(str);
371 static int vbd_name_to_disk(const char *name, const char **endp,
372 unsigned long *disk)
374 unsigned int n = 0;
376 while (*name != '\0') {
377 if (!g_ascii_isalpha(*name) || !g_ascii_islower(*name)) {
378 break;
381 n *= 26;
382 n += *name++ - 'a' + 1;
384 *endp = name;
386 if (!n) {
387 return -1;
390 *disk = n - 1;
392 return 0;
395 static void xen_block_set_vdev(Object *obj, Visitor *v, const char *name,
396 void *opaque, Error **errp)
398 Property *prop = opaque;
399 XenBlockVdev *vdev = object_field_prop_ptr(obj, prop);
400 char *str, *p;
401 const char *end;
403 if (!visit_type_str(v, name, &str, errp)) {
404 return;
407 p = strchr(str, 'd');
408 if (!p) {
409 goto invalid;
412 *p++ = '\0';
413 if (*str == '\0') {
414 vdev->type = XEN_BLOCK_VDEV_TYPE_DP;
415 } else if (strcmp(str, "xv") == 0) {
416 vdev->type = XEN_BLOCK_VDEV_TYPE_XVD;
417 } else if (strcmp(str, "h") == 0) {
418 vdev->type = XEN_BLOCK_VDEV_TYPE_HD;
419 } else if (strcmp(str, "s") == 0) {
420 vdev->type = XEN_BLOCK_VDEV_TYPE_SD;
421 } else {
422 goto invalid;
425 if (vdev->type == XEN_BLOCK_VDEV_TYPE_DP) {
426 if (qemu_strtoul(p, &end, 10, &vdev->disk)) {
427 goto invalid;
430 if (*end == 'p') {
431 if (*(++end) == '\0') {
432 goto invalid;
435 } else {
436 if (vbd_name_to_disk(p, &end, &vdev->disk)) {
437 goto invalid;
441 if (*end != '\0') {
442 p = (char *)end;
444 if (qemu_strtoul(p, &end, 10, &vdev->partition)) {
445 goto invalid;
448 if (*end != '\0') {
449 goto invalid;
451 } else {
452 vdev->partition = 0;
455 switch (vdev->type) {
456 case XEN_BLOCK_VDEV_TYPE_DP:
457 case XEN_BLOCK_VDEV_TYPE_XVD:
458 if (vdev->disk < (1 << 4) && vdev->partition < (1 << 4)) {
459 vdev->number = (202 << 8) | (vdev->disk << 4) |
460 vdev->partition;
461 } else if (vdev->disk < (1 << 20) && vdev->partition < (1 << 8)) {
462 vdev->number = (1 << 28) | (vdev->disk << 8) |
463 vdev->partition;
464 } else {
465 goto invalid;
467 break;
469 case XEN_BLOCK_VDEV_TYPE_HD:
470 if ((vdev->disk == 0 || vdev->disk == 1) &&
471 vdev->partition < (1 << 6)) {
472 vdev->number = (3 << 8) | (vdev->disk << 6) | vdev->partition;
473 } else if ((vdev->disk == 2 || vdev->disk == 3) &&
474 vdev->partition < (1 << 6)) {
475 vdev->number = (22 << 8) | ((vdev->disk - 2) << 6) |
476 vdev->partition;
477 } else {
478 goto invalid;
480 break;
482 case XEN_BLOCK_VDEV_TYPE_SD:
483 if (vdev->disk < (1 << 4) && vdev->partition < (1 << 4)) {
484 vdev->number = (8 << 8) | (vdev->disk << 4) | vdev->partition;
485 } else {
486 goto invalid;
488 break;
490 default:
491 goto invalid;
494 g_free(str);
495 return;
497 invalid:
498 error_setg(errp, "invalid virtual disk specifier");
500 vdev->type = XEN_BLOCK_VDEV_TYPE_INVALID;
501 g_free(str);
505 * This property deals with 'vdev' names adhering to the Xen VBD naming
506 * scheme described in:
508 * https://xenbits.xen.org/docs/unstable/man/xen-vbd-interface.7.html
510 const PropertyInfo xen_block_prop_vdev = {
511 .name = "str",
512 .description = "Virtual Disk specifier: d*p*/xvd*/hd*/sd*",
513 .get = xen_block_get_vdev,
514 .set = xen_block_set_vdev,
517 static Property xen_block_props[] = {
518 DEFINE_PROP("vdev", XenBlockDevice, props.vdev,
519 xen_block_prop_vdev, XenBlockVdev),
520 DEFINE_BLOCK_PROPERTIES(XenBlockDevice, props.conf),
521 DEFINE_PROP_UINT32("max-ring-page-order", XenBlockDevice,
522 props.max_ring_page_order, 4),
523 DEFINE_PROP_LINK("iothread", XenBlockDevice, props.iothread,
524 TYPE_IOTHREAD, IOThread *),
525 DEFINE_PROP_END_OF_LIST()
528 static void xen_block_class_init(ObjectClass *class, void *data)
530 DeviceClass *dev_class = DEVICE_CLASS(class);
531 XenDeviceClass *xendev_class = XEN_DEVICE_CLASS(class);
533 xendev_class->backend = "qdisk";
534 xendev_class->device = "vbd";
535 xendev_class->get_name = xen_block_get_name;
536 xendev_class->realize = xen_block_realize;
537 xendev_class->frontend_changed = xen_block_frontend_changed;
538 xendev_class->unrealize = xen_block_unrealize;
540 device_class_set_props(dev_class, xen_block_props);
543 static const TypeInfo xen_block_type_info = {
544 .name = TYPE_XEN_BLOCK_DEVICE,
545 .parent = TYPE_XEN_DEVICE,
546 .instance_size = sizeof(XenBlockDevice),
547 .abstract = true,
548 .class_size = sizeof(XenBlockDeviceClass),
549 .class_init = xen_block_class_init,
552 static void xen_disk_unrealize(XenBlockDevice *blockdev)
554 trace_xen_disk_unrealize();
557 static void xen_disk_realize(XenBlockDevice *blockdev, Error **errp)
559 BlockConf *conf = &blockdev->props.conf;
561 trace_xen_disk_realize();
563 blockdev->device_type = "disk";
565 if (!conf->blk) {
566 error_setg(errp, "drive property not set");
567 return;
570 blockdev->info = blk_is_read_only(conf->blk) ? VDISK_READONLY : 0;
573 static void xen_disk_class_init(ObjectClass *class, void *data)
575 DeviceClass *dev_class = DEVICE_CLASS(class);
576 XenBlockDeviceClass *blockdev_class = XEN_BLOCK_DEVICE_CLASS(class);
578 blockdev_class->realize = xen_disk_realize;
579 blockdev_class->unrealize = xen_disk_unrealize;
581 dev_class->desc = "Xen Disk Device";
584 static const TypeInfo xen_disk_type_info = {
585 .name = TYPE_XEN_DISK_DEVICE,
586 .parent = TYPE_XEN_BLOCK_DEVICE,
587 .instance_size = sizeof(XenDiskDevice),
588 .class_init = xen_disk_class_init,
591 static void xen_cdrom_unrealize(XenBlockDevice *blockdev)
593 trace_xen_cdrom_unrealize();
596 static void xen_cdrom_realize(XenBlockDevice *blockdev, Error **errp)
598 BlockConf *conf = &blockdev->props.conf;
600 trace_xen_cdrom_realize();
602 blockdev->device_type = "cdrom";
604 if (!conf->blk) {
605 int rc;
607 /* Set up an empty drive */
608 conf->blk = blk_new(qemu_get_aio_context(), 0, BLK_PERM_ALL);
610 rc = blk_attach_dev(conf->blk, DEVICE(blockdev));
611 if (!rc) {
612 error_setg_errno(errp, -rc, "failed to create drive");
613 return;
617 blockdev->info = VDISK_READONLY | VDISK_CDROM;
620 static void xen_cdrom_class_init(ObjectClass *class, void *data)
622 DeviceClass *dev_class = DEVICE_CLASS(class);
623 XenBlockDeviceClass *blockdev_class = XEN_BLOCK_DEVICE_CLASS(class);
625 blockdev_class->realize = xen_cdrom_realize;
626 blockdev_class->unrealize = xen_cdrom_unrealize;
628 dev_class->desc = "Xen CD-ROM Device";
631 static const TypeInfo xen_cdrom_type_info = {
632 .name = TYPE_XEN_CDROM_DEVICE,
633 .parent = TYPE_XEN_BLOCK_DEVICE,
634 .instance_size = sizeof(XenCDRomDevice),
635 .class_init = xen_cdrom_class_init,
638 static void xen_block_register_types(void)
640 type_register_static(&xen_block_type_info);
641 type_register_static(&xen_disk_type_info);
642 type_register_static(&xen_cdrom_type_info);
645 type_init(xen_block_register_types)
647 static void xen_block_blockdev_del(const char *node_name, Error **errp)
649 trace_xen_block_blockdev_del(node_name);
651 qmp_blockdev_del(node_name, errp);
654 static char *xen_block_blockdev_add(const char *id, QDict *qdict,
655 Error **errp)
657 ERRP_GUARD();
658 const char *driver = qdict_get_try_str(qdict, "driver");
659 BlockdevOptions *options = NULL;
660 char *node_name;
661 Visitor *v;
663 if (!driver) {
664 error_setg(errp, "no 'driver' parameter");
665 return NULL;
668 node_name = g_strdup_printf("%s-%s", id, driver);
669 qdict_put_str(qdict, "node-name", node_name);
671 trace_xen_block_blockdev_add(node_name);
673 v = qobject_input_visitor_new(QOBJECT(qdict));
674 visit_type_BlockdevOptions(v, NULL, &options, errp);
675 visit_free(v);
676 if (!options) {
677 goto fail;
680 qmp_blockdev_add(options, errp);
682 if (*errp) {
683 goto fail;
686 qapi_free_BlockdevOptions(options);
688 return node_name;
690 fail:
691 if (options) {
692 qapi_free_BlockdevOptions(options);
694 g_free(node_name);
696 return NULL;
699 static void xen_block_drive_destroy(XenBlockDrive *drive, Error **errp)
701 ERRP_GUARD();
702 char *node_name = drive->node_name;
704 if (node_name) {
705 xen_block_blockdev_del(node_name, errp);
706 if (*errp) {
707 return;
709 g_free(node_name);
710 drive->node_name = NULL;
712 g_free(drive->id);
713 g_free(drive);
716 static XenBlockDrive *xen_block_drive_create(const char *id,
717 const char *device_type,
718 QDict *opts, Error **errp)
720 ERRP_GUARD();
721 const char *params = qdict_get_try_str(opts, "params");
722 const char *mode = qdict_get_try_str(opts, "mode");
723 const char *direct_io_safe = qdict_get_try_str(opts, "direct-io-safe");
724 const char *discard_enable = qdict_get_try_str(opts, "discard-enable");
725 char *driver = NULL;
726 char *filename = NULL;
727 XenBlockDrive *drive = NULL;
728 QDict *file_layer;
729 QDict *driver_layer;
731 if (params) {
732 char **v = g_strsplit(params, ":", 2);
734 if (v[1] == NULL) {
735 filename = g_strdup(v[0]);
736 driver = g_strdup("raw");
737 } else {
738 if (strcmp(v[0], "aio") == 0) {
739 driver = g_strdup("raw");
740 } else if (strcmp(v[0], "vhd") == 0) {
741 driver = g_strdup("vpc");
742 } else {
743 driver = g_strdup(v[0]);
745 filename = g_strdup(v[1]);
748 g_strfreev(v);
749 } else {
750 error_setg(errp, "no params");
751 goto done;
754 assert(filename);
755 assert(driver);
757 drive = g_new0(XenBlockDrive, 1);
758 drive->id = g_strdup(id);
760 file_layer = qdict_new();
761 driver_layer = qdict_new();
763 qdict_put_str(file_layer, "driver", "file");
764 qdict_put_str(file_layer, "filename", filename);
765 g_free(filename);
767 if (mode && *mode != 'w') {
768 qdict_put_bool(file_layer, "read-only", true);
771 if (direct_io_safe) {
772 unsigned long value;
774 if (!qemu_strtoul(direct_io_safe, NULL, 2, &value) && !!value) {
775 QDict *cache_qdict = qdict_new();
777 qdict_put_bool(cache_qdict, "direct", true);
778 qdict_put(file_layer, "cache", cache_qdict);
780 qdict_put_str(file_layer, "aio", "native");
784 if (discard_enable) {
785 unsigned long value;
787 if (!qemu_strtoul(discard_enable, NULL, 2, &value) && !!value) {
788 qdict_put_str(file_layer, "discard", "unmap");
789 qdict_put_str(driver_layer, "discard", "unmap");
794 * It is necessary to turn file locking off as an emulated device
795 * may have already opened the same image file.
797 qdict_put_str(file_layer, "locking", "off");
799 qdict_put_str(driver_layer, "driver", driver);
800 g_free(driver);
802 qdict_put(driver_layer, "file", file_layer);
804 g_assert(!drive->node_name);
805 drive->node_name = xen_block_blockdev_add(drive->id, driver_layer,
806 errp);
808 qobject_unref(driver_layer);
810 done:
811 if (*errp) {
812 xen_block_drive_destroy(drive, NULL);
813 return NULL;
816 return drive;
819 static const char *xen_block_drive_get_node_name(XenBlockDrive *drive)
821 return drive->node_name ? drive->node_name : "";
824 static void xen_block_iothread_destroy(XenBlockIOThread *iothread,
825 Error **errp)
827 qmp_object_del(iothread->id, errp);
829 g_free(iothread->id);
830 g_free(iothread);
833 static XenBlockIOThread *xen_block_iothread_create(const char *id,
834 Error **errp)
836 ERRP_GUARD();
837 XenBlockIOThread *iothread = g_new(XenBlockIOThread, 1);
838 QDict *opts;
839 QObject *ret_data = NULL;
841 iothread->id = g_strdup(id);
843 opts = qdict_new();
844 qdict_put_str(opts, "qom-type", TYPE_IOTHREAD);
845 qdict_put_str(opts, "id", id);
846 qmp_object_add(opts, &ret_data, errp);
847 qobject_unref(opts);
848 qobject_unref(ret_data);
850 if (*errp) {
851 g_free(iothread->id);
852 g_free(iothread);
853 return NULL;
856 return iothread;
859 static void xen_block_device_create(XenBackendInstance *backend,
860 QDict *opts, Error **errp)
862 ERRP_GUARD();
863 XenBus *xenbus = xen_backend_get_bus(backend);
864 const char *name = xen_backend_get_name(backend);
865 unsigned long number;
866 const char *vdev, *device_type;
867 XenBlockDrive *drive = NULL;
868 XenBlockIOThread *iothread = NULL;
869 XenDevice *xendev = NULL;
870 const char *type;
871 XenBlockDevice *blockdev;
873 if (qemu_strtoul(name, NULL, 10, &number)) {
874 error_setg(errp, "failed to parse name '%s'", name);
875 goto fail;
878 trace_xen_block_device_create(number);
880 vdev = qdict_get_try_str(opts, "dev");
881 if (!vdev) {
882 error_setg(errp, "no dev parameter");
883 goto fail;
886 device_type = qdict_get_try_str(opts, "device-type");
887 if (!device_type) {
888 error_setg(errp, "no device-type parameter");
889 goto fail;
892 if (!strcmp(device_type, "disk")) {
893 type = TYPE_XEN_DISK_DEVICE;
894 } else if (!strcmp(device_type, "cdrom")) {
895 type = TYPE_XEN_CDROM_DEVICE;
896 } else {
897 error_setg(errp, "invalid device-type parameter '%s'", device_type);
898 goto fail;
901 drive = xen_block_drive_create(vdev, device_type, opts, errp);
902 if (!drive) {
903 error_prepend(errp, "failed to create drive: ");
904 goto fail;
907 iothread = xen_block_iothread_create(vdev, errp);
908 if (*errp) {
909 error_prepend(errp, "failed to create iothread: ");
910 goto fail;
913 xendev = XEN_DEVICE(qdev_new(type));
914 blockdev = XEN_BLOCK_DEVICE(xendev);
916 if (!object_property_set_str(OBJECT(xendev), "vdev", vdev,
917 errp)) {
918 error_prepend(errp, "failed to set 'vdev': ");
919 goto fail;
922 if (!object_property_set_str(OBJECT(xendev), "drive",
923 xen_block_drive_get_node_name(drive),
924 errp)) {
925 error_prepend(errp, "failed to set 'drive': ");
926 goto fail;
929 if (!object_property_set_str(OBJECT(xendev), "iothread", iothread->id,
930 errp)) {
931 error_prepend(errp, "failed to set 'iothread': ");
932 goto fail;
935 blockdev->iothread = iothread;
936 blockdev->drive = drive;
938 if (!qdev_realize_and_unref(DEVICE(xendev), BUS(xenbus), errp)) {
939 error_prepend(errp, "realization of device %s failed: ", type);
940 goto fail;
943 xen_backend_set_device(backend, xendev);
944 return;
946 fail:
947 if (xendev) {
948 object_unparent(OBJECT(xendev));
951 if (iothread) {
952 xen_block_iothread_destroy(iothread, NULL);
955 if (drive) {
956 xen_block_drive_destroy(drive, NULL);
960 static void xen_block_device_destroy(XenBackendInstance *backend,
961 Error **errp)
963 ERRP_GUARD();
964 XenDevice *xendev = xen_backend_get_device(backend);
965 XenBlockDevice *blockdev = XEN_BLOCK_DEVICE(xendev);
966 XenBlockVdev *vdev = &blockdev->props.vdev;
967 XenBlockDrive *drive = blockdev->drive;
968 XenBlockIOThread *iothread = blockdev->iothread;
970 trace_xen_block_device_destroy(vdev->number);
972 object_unparent(OBJECT(xendev));
974 if (iothread) {
975 xen_block_iothread_destroy(iothread, errp);
976 if (*errp) {
977 error_prepend(errp, "failed to destroy iothread: ");
978 return;
982 if (drive) {
983 xen_block_drive_destroy(drive, errp);
984 if (*errp) {
985 error_prepend(errp, "failed to destroy drive: ");
986 return;
991 static const XenBackendInfo xen_block_backend_info = {
992 .type = "qdisk",
993 .create = xen_block_device_create,
994 .destroy = xen_block_device_destroy,
997 static void xen_block_register_backend(void)
999 xen_backend_register(&xen_block_backend_info);
1002 xen_backend_init(xen_block_register_backend);