70 #if 0
79 static MALLOC_DEFINE(M_XENBLOCKFRONT, "xbd", "Xen Block Front driver data");
82 SYSCTL_NODE(_hw, OID_AUTO, xbd, CTLFLAG_RD | CTLFLAG_MPSAFE, 0,
83     "xbd driver parameters");
85     &xbd_enable_indirect, 0, "Enable xbd indirect segments");
91 	if (xbd_flag != XBDF_NONE && (sc->xbd_flags & xbd_flag) != 0)  in xbd_freeze()
101 	if (xbd_flag != XBDF_NONE && (sc->xbd_flags & xbd_flag) == 0)  in xbd_thaw()
104 	if (sc->xbd_qfrozen_cnt == 0)  in xbd_thaw()
105 		panic("%s: Thaw with flag 0x%x while not frozen.",  in xbd_thaw()
115 	if ((cm->cm_flags & XBDCF_FROZEN) != 0)  in xbd_cm_freeze()
125 	if ((cm->cm_flags & XBDCF_FROZEN) == 0)  in xbd_cm_thaw()
170 		KASSERT((segs->ds_addr & (sector_size - 1)) == 0,  in xbd_mksegarray()
172 		KASSERT((segs->ds_len & (sector_size - 1)) == 0,  in xbd_mksegarray()
186 		 * GNTTAB_LIST_END == 0xffffffff, but it is private  in xbd_mksegarray()
189 		KASSERT(ref != ~0, ("grant_reference failed"));  in xbd_mksegarray()
275 		op = 0;  in xbd_queue_cb()
289 	if ((cm->cm_flags & XBDCF_ASYNC_MAPPING) != 0)  in xbd_queue_cb()
302 		    cm->cm_bp, xbd_queue_cb, cm, 0);  in xbd_queue_request()
305 		    cm->cm_data, cm->cm_datalen, xbd_queue_cb, cm, 0);  in xbd_queue_request()
314 		return (0);  in xbd_queue_request()
354 	    &cm->cm_gref_head) != 0) {  in xbd_bio_command()
375 		if ((bp->bio_flags & BIO_ORDERED) != 0) {  in xbd_bio_command()
376 			if ((sc->xbd_flags & XBDF_BARRIER) != 0) {  in xbd_bio_command()
383 				if (xbd_queue_length(sc, XBD_Q_BUSY) != 0) {  in xbd_bio_command()
396 		if ((sc->xbd_flags & XBDF_FLUSH) != 0)  in xbd_bio_command()
398 		else if ((sc->xbd_flags & XBDF_BARRIER) != 0)  in xbd_bio_command()
423 	int error, queued = 0;  in xbd_startio()
431 		if (sc->xbd_qfrozen_cnt != 0)  in xbd_startio()
442 		if ((cm->cm_flags & XBDCF_Q_FREEZE) != 0) {  in xbd_startio()
450 		if ((error = xbd_queue_request(sc, cm)) != 0) {  in xbd_startio()
457 	if (queued != 0)   in xbd_startio()
469 		disk_err(bp, "disk error" , -1, 0);  in xbd_bio_complete()
477 		bp->bio_resid = 0;  in xbd_bio_complete()
518 			op = 0;  in xbd_int()
552 	if (xbd_queue_length(sc, XBD_Q_BUSY) == 0)  in xbd_int()
573 	while (xbd_queue_length(sc, XBD_Q_BUSY) != 0) {  in xbd_quiesce()
579 		if (xbd_queue_length(sc, XBD_Q_BUSY) != 0) {  in xbd_quiesce()
604 	int rc = 0;  in xbd_dump()
606 	if (length == 0)  in xbd_dump()
607 		return (0);  in xbd_dump()
618 	while (length > 0) {  in xbd_dump()
627 		    &cm->cm_gref_head) != 0) {  in xbd_dump()
677 		printf("xbd%d: not found", dp->d_unit);  in xbd_open()
683 	return (0);  in xbd_open()
694 	if (--(sc->xbd_users) == 0) {  in xbd_close()
704 	return (0);  in xbd_close()
766 	for (i = 0, sring_page_addr = (uintptr_t)sring;  in xbd_alloc_ring()
780 		    "ring-ref", "%u", sc->xbd_ring_ref[0]);  in xbd_alloc_ring()
788 		for (i = 0; i < sc->xbd_ring_pages; i++) {  in xbd_alloc_ring()
814 	return (0);  in xbd_alloc_ring()
825 	for (i = 0; i < sc->xbd_ring_pages; i++) {  in xbd_free_ring()
844 	feature_cnt = 0;  in xbd_feature_string()
845 	if ((sc->xbd_flags & XBDF_FLUSH) != 0) {  in xbd_feature_string()
850 	if ((sc->xbd_flags & XBDF_BARRIER) != 0) {  in xbd_feature_string()
851 		if (feature_cnt != 0)  in xbd_feature_string()
857 	if ((sc->xbd_flags & XBDF_DISCARD) != 0) {  in xbd_feature_string()
858 		if (feature_cnt != 0)  in xbd_feature_string()
864 	if ((sc->xbd_flags & XBDF_PERSISTENT) != 0) {  in xbd_feature_string()
865 		if (feature_cnt != 0)  in xbd_feature_string()
883 	error = sysctl_wire_old_buffer(req, 0);  in xbd_sysctl_features()
884 	if (error != 0)  in xbd_sysctl_features()
894 xbd_setup_sysctl(struct xbd_softc *xbd)  in xbd_setup_sysctl()  argument
900 	sysctl_ctx = device_get_sysctl_ctx(xbd->xbd_dev);  in xbd_setup_sysctl()
904 	sysctl_tree = device_get_sysctl_tree(xbd->xbd_dev);  in xbd_setup_sysctl()
910 	    "max_requests", CTLFLAG_RD, &xbd->xbd_max_requests, -1,  in xbd_setup_sysctl()
915 	    &xbd->xbd_max_request_segments, 0,  in xbd_setup_sysctl()
919 	    "max_request_size", CTLFLAG_RD, &xbd->xbd_max_request_size, 0,  in xbd_setup_sysctl()
923 	    "ring_pages", CTLFLAG_RD, &xbd->xbd_ring_pages, 0,  in xbd_setup_sysctl()
927 	    "features", CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE, xbd,  in xbd_setup_sysctl()
928 	    0, xbd_sysctl_features, "A", "protocol features (negotiated)");  in xbd_setup_sysctl()
945 		{3,	6,	0,	"ada"},	/* ide0 */  in xbd_vdevice_to_unit()
956 		{8,	4,	0,	"da"},	/* scsi disk0 */  in xbd_vdevice_to_unit()
973 		{202,	4,	0,	"xbd"},	/* xbd */  in xbd_vdevice_to_unit()
975 		{0,	0,	0,	NULL},  in xbd_vdevice_to_unit()
978 	int minor = vdevice & 0xff;  in xbd_vdevice_to_unit()
983 		*name = "xbd";  in xbd_vdevice_to_unit()
987 	for (i = 0; info[i].major; i++) {  in xbd_vdevice_to_unit()
996 	*name = "xbd";  in xbd_vdevice_to_unit()
1005 	int unit, error = 0;  in xbd_instance_create()
1012 	if (strcmp(name, "xbd") != 0)  in xbd_instance_create()
1015 	if (xbd_feature_string(sc, features, sizeof(features)) > 0) {  in xbd_instance_create()
1031 	sc->xbd_disk->d_stripeoffset = 0;  in xbd_instance_create()
1038 	if ((sc->xbd_disk->d_mediasize % sc->xbd_disk->d_sectorsize) != 0) {  in xbd_instance_create()
1048 	if ((sc->xbd_flags & (XBDF_FLUSH|XBDF_BARRIER)) != 0) {  in xbd_instance_create()
1071 		for (i = 0; i < sc->xbd_max_requests; i++) {  in xbd_free()
1083 				    &cm->cm_indirectionrefs[0]);  in xbd_free()
1122 	max_ring_page_order = 0;  in xbd_initialize()
1158 	if (powerof2(sc->xbd_ring_pages) == 0) {  in xbd_initialize()
1161 		new_page_limit = 0x01 << (fls(sc->xbd_ring_pages) - 1);  in xbd_initialize()
1179 	if (xbd_alloc_ring(sc) != 0)  in xbd_initialize()
1255 		if (err != 0) {  in xbd_connect()
1286 	if ((sectors == 0) || (sector_size == 0)) {  in xbd_connect()
1287 		xenbus_dev_fatal(dev, 0,  in xbd_connect()
1298 		phys_sector_size = 0;  in xbd_connect()
1302 	if (err == 0 && feature_barrier != 0)  in xbd_connect()
1308 	if (err == 0 && feature_flush != 0)  in xbd_connect()
1314 	if ((err != 0) || (xbd_enable_indirect == 0))  in xbd_connect()
1315 		sc->xbd_max_request_segments = 0;  in xbd_connect()
1341 	if (err != 0) {  in xbd_connect()
1357 	for (i = 0; i < sc->xbd_max_requests; i++) {  in xbd_connect()
1370 		if (bus_dmamap_create(sc->xbd_io_dmat, 0, &cm->cm_map) != 0)  in xbd_connect()
1372 		if (sc->xbd_max_request_indirectpages > 0) {  in xbd_connect()
1375 			    M_XENBLOCKFRONT, M_ZERO | M_NOWAIT, 0, ~0,  in xbd_connect()
1376 			    PAGE_SIZE, 0);  in xbd_connect()
1378 				sc->xbd_max_request_indirectpages = 0;  in xbd_connect()
1382 		for (j = 0; j < sc->xbd_max_request_indirectpages; j++) {  in xbd_connect()
1407 		if (err != 0) {  in xbd_connect()
1450 	if (strcmp(xenbus_get_type(dev), "vbd") != 0)  in xbd_probe()
1479 		if (strncmp(type, "cdrom", 5) == 0) {  in xbd_probe()
1488 	return (0);  in xbd_probe()
1519 	if (!strcmp(name, "xbd"))  in xbd_attach()
1525 	for (i = 0; i < XBD_MAX_RING_PAGES; i++)  in xbd_attach()
1537 	return (0);  in xbd_attach()
1550 	return 0;  in xbd_detach()
1566 	retval = 0;  in xbd_suspend()
1567 	while (xbd_queue_length(sc, XBD_Q_BUSY) != 0) {  in xbd_suspend()
1576 	if (retval != 0)  in xbd_suspend()
1589 		return (0);  in xbd_resume()
1596 	return (0);  in xbd_resume()
1628 		if (sc->xbd_users > 0) {  in xbd_backend_changed()
1657 	"xbd", 
1662 DRIVER_MODULE(xbd, xenbusb_front, xbd_driver, 0, 0);