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 14 #include "qemu/osdep.h" 15 #include <libgen.h> 16 #include "qapi/error.h" 17 #include "qemu/module.h" 18 #include "hw/sysbus.h" 19 #include "hw/s390x/css.h" 20 #include "hw/s390x/css-bridge.h" 21 #include "hw/s390x/s390-ccw.h" 22 23 IOInstEnding s390_ccw_cmd_request(SubchDev *sch) 24 { 25 S390CCWDeviceClass *cdc = S390_CCW_DEVICE_GET_CLASS(sch->driver_data); 26 27 if (!cdc->handle_request) { 28 return IOINST_CC_STATUS_PRESENT; 29 } 30 return cdc->handle_request(sch); 31 } 32 33 int s390_ccw_halt(SubchDev *sch) 34 { 35 S390CCWDeviceClass *cdc = S390_CCW_DEVICE_GET_CLASS(sch->driver_data); 36 37 if (!cdc->handle_halt) { 38 return -ENOSYS; 39 } 40 return cdc->handle_halt(sch); 41 } 42 43 int s390_ccw_clear(SubchDev *sch) 44 { 45 S390CCWDeviceClass *cdc = S390_CCW_DEVICE_GET_CLASS(sch->driver_data); 46 47 if (!cdc->handle_clear) { 48 return -ENOSYS; 49 } 50 return cdc->handle_clear(sch); 51 } 52 53 static void s390_ccw_get_dev_info(S390CCWDevice *cdev, 54 char *sysfsdev, 55 Error **errp) 56 { 57 unsigned int cssid, ssid, devid; 58 char dev_path[PATH_MAX] = {0}, *tmp; 59 60 if (!sysfsdev) { 61 error_setg(errp, "No host device provided"); 62 error_append_hint(errp, 63 "Use -device vfio-ccw,sysfsdev=PATH_TO_DEVICE\n"); 64 return; 65 } 66 67 if (!realpath(sysfsdev, dev_path)) { 68 error_setg_errno(errp, errno, "Host device '%s' not found", sysfsdev); 69 return; 70 } 71 72 cdev->mdevid = g_path_get_basename(dev_path); 73 74 tmp = basename(dirname(dev_path)); 75 if (sscanf(tmp, "%2x.%1x.%4x", &cssid, &ssid, &devid) != 3) { 76 error_setg_errno(errp, errno, "Failed to read %s", tmp); 77 return; 78 } 79 80 cdev->hostid.cssid = cssid; 81 cdev->hostid.ssid = ssid; 82 cdev->hostid.devid = devid; 83 cdev->hostid.valid = true; 84 } 85 86 static void s390_ccw_realize(S390CCWDevice *cdev, char *sysfsdev, Error **errp) 87 { 88 CcwDevice *ccw_dev = CCW_DEVICE(cdev); 89 CCWDeviceClass *ck = CCW_DEVICE_GET_CLASS(ccw_dev); 90 DeviceState *parent = DEVICE(ccw_dev); 91 SubchDev *sch; 92 int ret; 93 Error *err = NULL; 94 95 s390_ccw_get_dev_info(cdev, sysfsdev, &err); 96 if (err) { 97 goto out_err_propagate; 98 } 99 100 sch = css_create_sch(ccw_dev->devno, &err); 101 if (!sch) { 102 goto out_mdevid_free; 103 } 104 sch->driver_data = cdev; 105 sch->do_subchannel_work = do_subchannel_work_passthrough; 106 107 ccw_dev->sch = sch; 108 ret = css_sch_build_schib(sch, &cdev->hostid); 109 if (ret) { 110 error_setg_errno(&err, -ret, "%s: Failed to build initial schib", 111 __func__); 112 goto out_err; 113 } 114 115 ck->realize(ccw_dev, &err); 116 if (err) { 117 goto out_err; 118 } 119 120 css_generate_sch_crws(sch->cssid, sch->ssid, sch->schid, 121 parent->hotplugged, 1); 122 return; 123 124 out_err: 125 css_subch_assign(sch->cssid, sch->ssid, sch->schid, sch->devno, NULL); 126 ccw_dev->sch = NULL; 127 g_free(sch); 128 out_mdevid_free: 129 g_free(cdev->mdevid); 130 out_err_propagate: 131 error_propagate(errp, err); 132 } 133 134 static void s390_ccw_unrealize(S390CCWDevice *cdev, Error **errp) 135 { 136 CcwDevice *ccw_dev = CCW_DEVICE(cdev); 137 SubchDev *sch = ccw_dev->sch; 138 139 if (sch) { 140 css_subch_assign(sch->cssid, sch->ssid, sch->schid, sch->devno, NULL); 141 g_free(sch); 142 ccw_dev->sch = NULL; 143 } 144 145 g_free(cdev->mdevid); 146 } 147 148 static void s390_ccw_instance_init(Object *obj) 149 { 150 S390CCWDevice *dev = S390_CCW_DEVICE(obj); 151 152 device_add_bootindex_property(obj, &dev->bootindex, "bootindex", 153 "/disk@0,0", DEVICE(obj), NULL); 154 } 155 156 static void s390_ccw_class_init(ObjectClass *klass, void *data) 157 { 158 DeviceClass *dc = DEVICE_CLASS(klass); 159 S390CCWDeviceClass *cdc = S390_CCW_DEVICE_CLASS(klass); 160 161 dc->bus_type = TYPE_VIRTUAL_CSS_BUS; 162 cdc->realize = s390_ccw_realize; 163 cdc->unrealize = s390_ccw_unrealize; 164 } 165 166 static const TypeInfo s390_ccw_info = { 167 .name = TYPE_S390_CCW, 168 .parent = TYPE_CCW_DEVICE, 169 .instance_init = s390_ccw_instance_init, 170 .instance_size = sizeof(S390CCWDevice), 171 .class_size = sizeof(S390CCWDeviceClass), 172 .class_init = s390_ccw_class_init, 173 .abstract = true, 174 }; 175 176 static void register_s390_ccw_type(void) 177 { 178 type_register_static(&s390_ccw_info); 179 } 180 181 type_init(register_s390_ccw_type) 182