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 #include "sysemu/sysemu.h" 23 24 IOInstEnding s390_ccw_cmd_request(SubchDev *sch) 25 { 26 S390CCWDeviceClass *cdc = S390_CCW_DEVICE_GET_CLASS(sch->driver_data); 27 28 if (!cdc->handle_request) { 29 return IOINST_CC_STATUS_PRESENT; 30 } 31 return cdc->handle_request(sch); 32 } 33 34 int s390_ccw_halt(SubchDev *sch) 35 { 36 S390CCWDeviceClass *cdc = S390_CCW_DEVICE_GET_CLASS(sch->driver_data); 37 38 if (!cdc->handle_halt) { 39 return -ENOSYS; 40 } 41 return cdc->handle_halt(sch); 42 } 43 44 int s390_ccw_clear(SubchDev *sch) 45 { 46 S390CCWDeviceClass *cdc = S390_CCW_DEVICE_GET_CLASS(sch->driver_data); 47 48 if (!cdc->handle_clear) { 49 return -ENOSYS; 50 } 51 return cdc->handle_clear(sch); 52 } 53 54 static void s390_ccw_get_dev_info(S390CCWDevice *cdev, 55 char *sysfsdev, 56 Error **errp) 57 { 58 unsigned int cssid, ssid, devid; 59 char dev_path[PATH_MAX] = {0}, *tmp; 60 61 if (!sysfsdev) { 62 error_setg(errp, "No host device provided"); 63 error_append_hint(errp, 64 "Use -device vfio-ccw,sysfsdev=PATH_TO_DEVICE\n"); 65 return; 66 } 67 68 if (!realpath(sysfsdev, dev_path)) { 69 error_setg_errno(errp, errno, "Host device '%s' not found", sysfsdev); 70 return; 71 } 72 73 cdev->mdevid = g_path_get_basename(dev_path); 74 75 tmp = basename(dirname(dev_path)); 76 if (sscanf(tmp, "%2x.%1x.%4x", &cssid, &ssid, &devid) != 3) { 77 error_setg_errno(errp, errno, "Failed to read %s", tmp); 78 return; 79 } 80 81 cdev->hostid.cssid = cssid; 82 cdev->hostid.ssid = ssid; 83 cdev->hostid.devid = devid; 84 cdev->hostid.valid = true; 85 } 86 87 static void s390_ccw_realize(S390CCWDevice *cdev, char *sysfsdev, Error **errp) 88 { 89 CcwDevice *ccw_dev = CCW_DEVICE(cdev); 90 CCWDeviceClass *ck = CCW_DEVICE_GET_CLASS(ccw_dev); 91 DeviceState *parent = DEVICE(ccw_dev); 92 SubchDev *sch; 93 int ret; 94 Error *err = NULL; 95 96 s390_ccw_get_dev_info(cdev, sysfsdev, &err); 97 if (err) { 98 goto out_err_propagate; 99 } 100 101 sch = css_create_sch(ccw_dev->devno, &err); 102 if (!sch) { 103 goto out_mdevid_free; 104 } 105 sch->driver_data = cdev; 106 sch->do_subchannel_work = do_subchannel_work_passthrough; 107 108 ccw_dev->sch = sch; 109 ret = css_sch_build_schib(sch, &cdev->hostid); 110 if (ret) { 111 error_setg_errno(&err, -ret, "%s: Failed to build initial schib", 112 __func__); 113 goto out_err; 114 } 115 116 ck->realize(ccw_dev, &err); 117 if (err) { 118 goto out_err; 119 } 120 121 css_generate_sch_crws(sch->cssid, sch->ssid, sch->schid, 122 parent->hotplugged, 1); 123 return; 124 125 out_err: 126 css_subch_assign(sch->cssid, sch->ssid, sch->schid, sch->devno, NULL); 127 ccw_dev->sch = NULL; 128 g_free(sch); 129 out_mdevid_free: 130 g_free(cdev->mdevid); 131 out_err_propagate: 132 error_propagate(errp, err); 133 } 134 135 static void s390_ccw_unrealize(S390CCWDevice *cdev) 136 { 137 CcwDevice *ccw_dev = CCW_DEVICE(cdev); 138 SubchDev *sch = ccw_dev->sch; 139 140 if (sch) { 141 css_subch_assign(sch->cssid, sch->ssid, sch->schid, sch->devno, NULL); 142 g_free(sch); 143 ccw_dev->sch = NULL; 144 } 145 146 g_free(cdev->mdevid); 147 } 148 149 static void s390_ccw_instance_init(Object *obj) 150 { 151 S390CCWDevice *dev = S390_CCW_DEVICE(obj); 152 153 device_add_bootindex_property(obj, &dev->bootindex, "bootindex", 154 "/disk@0,0", DEVICE(obj)); 155 } 156 157 static void s390_ccw_class_init(ObjectClass *klass, void *data) 158 { 159 DeviceClass *dc = DEVICE_CLASS(klass); 160 S390CCWDeviceClass *cdc = S390_CCW_DEVICE_CLASS(klass); 161 162 dc->bus_type = TYPE_VIRTUAL_CSS_BUS; 163 cdc->realize = s390_ccw_realize; 164 cdc->unrealize = s390_ccw_unrealize; 165 } 166 167 static const TypeInfo s390_ccw_info = { 168 .name = TYPE_S390_CCW, 169 .parent = TYPE_CCW_DEVICE, 170 .instance_init = s390_ccw_instance_init, 171 .instance_size = sizeof(S390CCWDevice), 172 .class_size = sizeof(S390CCWDeviceClass), 173 .class_init = s390_ccw_class_init, 174 .abstract = true, 175 }; 176 177 static void register_s390_ccw_type(void) 178 { 179 type_register_static(&s390_ccw_info); 180 } 181 182 type_init(register_s390_ccw_type) 183