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 IOInstEnding s390_ccw_cmd_request(SubchDev *sch) 22 { 23 S390CCWDeviceClass *cdc = S390_CCW_DEVICE_GET_CLASS(sch->driver_data); 24 25 if (!cdc->handle_request) { 26 return IOINST_CC_STATUS_PRESENT; 27 } 28 return cdc->handle_request(sch); 29 } 30 31 static void s390_ccw_get_dev_info(S390CCWDevice *cdev, 32 char *sysfsdev, 33 Error **errp) 34 { 35 unsigned int cssid, ssid, devid; 36 char dev_path[PATH_MAX] = {0}, *tmp; 37 38 if (!sysfsdev) { 39 error_setg(errp, "No host device provided"); 40 error_append_hint(errp, 41 "Use -device vfio-ccw,sysfsdev=PATH_TO_DEVICE\n"); 42 return; 43 } 44 45 if (!realpath(sysfsdev, dev_path)) { 46 error_setg_errno(errp, errno, "Host device '%s' not found", sysfsdev); 47 return; 48 } 49 50 cdev->mdevid = g_strdup(basename(dev_path)); 51 52 tmp = basename(dirname(dev_path)); 53 if (sscanf(tmp, "%2x.%1x.%4x", &cssid, &ssid, &devid) != 3) { 54 error_setg_errno(errp, errno, "Failed to read %s", tmp); 55 return; 56 } 57 58 cdev->hostid.cssid = cssid; 59 cdev->hostid.ssid = ssid; 60 cdev->hostid.devid = devid; 61 cdev->hostid.valid = true; 62 } 63 64 static void s390_ccw_realize(S390CCWDevice *cdev, char *sysfsdev, Error **errp) 65 { 66 CcwDevice *ccw_dev = CCW_DEVICE(cdev); 67 CCWDeviceClass *ck = CCW_DEVICE_GET_CLASS(ccw_dev); 68 DeviceState *parent = DEVICE(ccw_dev); 69 BusState *qbus = qdev_get_parent_bus(parent); 70 VirtualCssBus *cbus = VIRTUAL_CSS_BUS(qbus); 71 SubchDev *sch; 72 int ret; 73 Error *err = NULL; 74 75 s390_ccw_get_dev_info(cdev, sysfsdev, &err); 76 if (err) { 77 goto out_err_propagate; 78 } 79 80 sch = css_create_sch(ccw_dev->devno, false, cbus->squash_mcss, &err); 81 if (!sch) { 82 goto out_mdevid_free; 83 } 84 sch->driver_data = cdev; 85 sch->do_subchannel_work = do_subchannel_work_passthrough; 86 87 ccw_dev->sch = sch; 88 ret = css_sch_build_schib(sch, &cdev->hostid); 89 if (ret) { 90 error_setg_errno(&err, -ret, "%s: Failed to build initial schib", 91 __func__); 92 goto out_err; 93 } 94 95 ck->realize(ccw_dev, &err); 96 if (err) { 97 goto out_err; 98 } 99 100 css_generate_sch_crws(sch->cssid, sch->ssid, sch->schid, 101 parent->hotplugged, 1); 102 return; 103 104 out_err: 105 css_subch_assign(sch->cssid, sch->ssid, sch->schid, sch->devno, NULL); 106 ccw_dev->sch = NULL; 107 g_free(sch); 108 out_mdevid_free: 109 g_free(cdev->mdevid); 110 out_err_propagate: 111 error_propagate(errp, err); 112 } 113 114 static void s390_ccw_unrealize(S390CCWDevice *cdev, Error **errp) 115 { 116 CcwDevice *ccw_dev = CCW_DEVICE(cdev); 117 SubchDev *sch = ccw_dev->sch; 118 119 if (sch) { 120 css_subch_assign(sch->cssid, sch->ssid, sch->schid, sch->devno, NULL); 121 g_free(sch); 122 ccw_dev->sch = NULL; 123 } 124 125 g_free(cdev->mdevid); 126 } 127 128 static void s390_ccw_class_init(ObjectClass *klass, void *data) 129 { 130 DeviceClass *dc = DEVICE_CLASS(klass); 131 S390CCWDeviceClass *cdc = S390_CCW_DEVICE_CLASS(klass); 132 133 dc->bus_type = TYPE_VIRTUAL_CSS_BUS; 134 cdc->realize = s390_ccw_realize; 135 cdc->unrealize = s390_ccw_unrealize; 136 } 137 138 static const TypeInfo s390_ccw_info = { 139 .name = TYPE_S390_CCW, 140 .parent = TYPE_CCW_DEVICE, 141 .instance_size = sizeof(S390CCWDevice), 142 .class_size = sizeof(S390CCWDeviceClass), 143 .class_init = s390_ccw_class_init, 144 .abstract = true, 145 }; 146 147 static void register_s390_ccw_type(void) 148 { 149 type_register_static(&s390_ccw_info); 150 } 151 152 type_init(register_s390_ccw_type) 153