1 /* 2 * s390 CCW Assignment Support 3 * 4 * Copyright 2017 IBM Corp 5 * Author(s): Dong Jia Shi <bjsdjshi@linux.vnet.ibm.com> 6 * Xiao Feng Ren <renxiaof@linux.vnet.ibm.com> 7 * Pierre Morel <pmorel@linux.vnet.ibm.com> 8 * 9 * This work is licensed under the terms of the GNU GPL, version 2 10 * or (at your option) any later version. See the COPYING file in the 11 * top-level directory. 12 */ 13 #include "qemu/osdep.h" 14 #include "qapi/error.h" 15 #include "hw/sysbus.h" 16 #include "libgen.h" 17 #include "hw/s390x/css.h" 18 #include "hw/s390x/css-bridge.h" 19 #include "hw/s390x/s390-ccw.h" 20 21 int s390_ccw_cmd_request(ORB *orb, SCSW *scsw, void *data) 22 { 23 S390CCWDeviceClass *cdc = S390_CCW_DEVICE_GET_CLASS(data); 24 25 if (cdc->handle_request) { 26 return cdc->handle_request(orb, scsw, data); 27 } else { 28 return -ENOSYS; 29 } 30 } 31 32 static void s390_ccw_get_dev_info(S390CCWDevice *cdev, 33 char *sysfsdev, 34 Error **errp) 35 { 36 unsigned int cssid, ssid, devid; 37 char dev_path[PATH_MAX] = {0}, *tmp; 38 39 if (!sysfsdev) { 40 error_setg(errp, "No host device provided"); 41 error_append_hint(errp, 42 "Use -device vfio-ccw,sysfsdev=PATH_TO_DEVICE\n"); 43 return; 44 } 45 46 if (!realpath(sysfsdev, dev_path)) { 47 error_setg_errno(errp, errno, "Host device '%s' not found", sysfsdev); 48 return; 49 } 50 51 cdev->mdevid = g_strdup(basename(dev_path)); 52 53 tmp = basename(dirname(dev_path)); 54 if (sscanf(tmp, "%2x.%1x.%4x", &cssid, &ssid, &devid) != 3) { 55 error_setg_errno(errp, errno, "Failed to read %s", tmp); 56 return; 57 } 58 59 cdev->hostid.cssid = cssid; 60 cdev->hostid.ssid = ssid; 61 cdev->hostid.devid = devid; 62 cdev->hostid.valid = true; 63 } 64 65 static void s390_ccw_realize(S390CCWDevice *cdev, char *sysfsdev, Error **errp) 66 { 67 CcwDevice *ccw_dev = CCW_DEVICE(cdev); 68 CCWDeviceClass *ck = CCW_DEVICE_GET_CLASS(ccw_dev); 69 DeviceState *parent = DEVICE(ccw_dev); 70 BusState *qbus = qdev_get_parent_bus(parent); 71 VirtualCssBus *cbus = VIRTUAL_CSS_BUS(qbus); 72 SubchDev *sch; 73 int ret; 74 Error *err = NULL; 75 76 s390_ccw_get_dev_info(cdev, sysfsdev, &err); 77 if (err) { 78 goto out_err_propagate; 79 } 80 81 sch = css_create_sch(ccw_dev->devno, false, cbus->squash_mcss, &err); 82 if (!sch) { 83 goto out_mdevid_free; 84 } 85 sch->driver_data = cdev; 86 sch->do_subchannel_work = do_subchannel_work_passthrough; 87 88 ccw_dev->sch = sch; 89 ret = css_sch_build_schib(sch, &cdev->hostid); 90 if (ret) { 91 error_setg_errno(&err, -ret, "%s: Failed to build initial schib", 92 __func__); 93 goto out_err; 94 } 95 96 ck->realize(ccw_dev, &err); 97 if (err) { 98 goto out_err; 99 } 100 101 css_generate_sch_crws(sch->cssid, sch->ssid, sch->schid, 102 parent->hotplugged, 1); 103 return; 104 105 out_err: 106 css_subch_assign(sch->cssid, sch->ssid, sch->schid, sch->devno, NULL); 107 ccw_dev->sch = NULL; 108 g_free(sch); 109 out_mdevid_free: 110 g_free(cdev->mdevid); 111 out_err_propagate: 112 error_propagate(errp, err); 113 } 114 115 static void s390_ccw_unrealize(S390CCWDevice *cdev, Error **errp) 116 { 117 CcwDevice *ccw_dev = CCW_DEVICE(cdev); 118 SubchDev *sch = ccw_dev->sch; 119 120 if (sch) { 121 css_subch_assign(sch->cssid, sch->ssid, sch->schid, sch->devno, NULL); 122 g_free(sch); 123 ccw_dev->sch = NULL; 124 } 125 126 g_free(cdev->mdevid); 127 } 128 129 static void s390_ccw_class_init(ObjectClass *klass, void *data) 130 { 131 DeviceClass *dc = DEVICE_CLASS(klass); 132 S390CCWDeviceClass *cdc = S390_CCW_DEVICE_CLASS(klass); 133 134 dc->bus_type = TYPE_VIRTUAL_CSS_BUS; 135 cdc->realize = s390_ccw_realize; 136 cdc->unrealize = s390_ccw_unrealize; 137 } 138 139 static const TypeInfo s390_ccw_info = { 140 .name = TYPE_S390_CCW, 141 .parent = TYPE_CCW_DEVICE, 142 .instance_size = sizeof(S390CCWDevice), 143 .class_size = sizeof(S390CCWDeviceClass), 144 .class_init = s390_ccw_class_init, 145 .abstract = true, 146 }; 147 148 static void register_s390_ccw_type(void) 149 { 150 type_register_static(&s390_ccw_info); 151 } 152 153 type_init(register_s390_ccw_type) 154