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 IOInstEnding s390_ccw_store(SubchDev *sch) 55 { 56 S390CCWDeviceClass *cdc = NULL; 57 int ret = IOINST_CC_EXPECTED; 58 59 /* 60 * This code is called for both virtual and passthrough devices, 61 * but only applies to to the latter. This ugly check makes that 62 * distinction for us. 63 */ 64 if (object_dynamic_cast(OBJECT(sch->driver_data), TYPE_S390_CCW)) { 65 cdc = S390_CCW_DEVICE_GET_CLASS(sch->driver_data); 66 } 67 68 if (cdc && cdc->handle_store) { 69 ret = cdc->handle_store(sch); 70 } 71 72 return ret; 73 } 74 75 static void s390_ccw_get_dev_info(S390CCWDevice *cdev, 76 char *sysfsdev, 77 Error **errp) 78 { 79 unsigned int cssid, ssid, devid; 80 char dev_path[PATH_MAX] = {0}, *tmp; 81 82 if (!sysfsdev) { 83 error_setg(errp, "No host device provided"); 84 error_append_hint(errp, 85 "Use -device vfio-ccw,sysfsdev=PATH_TO_DEVICE\n"); 86 return; 87 } 88 89 if (!realpath(sysfsdev, dev_path)) { 90 error_setg_errno(errp, errno, "Host device '%s' not found", sysfsdev); 91 return; 92 } 93 94 cdev->mdevid = g_path_get_basename(dev_path); 95 96 tmp = basename(dirname(dev_path)); 97 if (sscanf(tmp, "%2x.%1x.%4x", &cssid, &ssid, &devid) != 3) { 98 error_setg_errno(errp, errno, "Failed to read %s", tmp); 99 return; 100 } 101 102 cdev->hostid.cssid = cssid; 103 cdev->hostid.ssid = ssid; 104 cdev->hostid.devid = devid; 105 cdev->hostid.valid = true; 106 } 107 108 static void s390_ccw_realize(S390CCWDevice *cdev, char *sysfsdev, Error **errp) 109 { 110 CcwDevice *ccw_dev = CCW_DEVICE(cdev); 111 CCWDeviceClass *ck = CCW_DEVICE_GET_CLASS(ccw_dev); 112 DeviceState *parent = DEVICE(ccw_dev); 113 SubchDev *sch; 114 int ret; 115 Error *err = NULL; 116 117 s390_ccw_get_dev_info(cdev, sysfsdev, &err); 118 if (err) { 119 goto out_err_propagate; 120 } 121 122 sch = css_create_sch(ccw_dev->devno, &err); 123 if (!sch) { 124 goto out_mdevid_free; 125 } 126 sch->driver_data = cdev; 127 sch->do_subchannel_work = do_subchannel_work_passthrough; 128 129 ccw_dev->sch = sch; 130 ret = css_sch_build_schib(sch, &cdev->hostid); 131 if (ret) { 132 error_setg_errno(&err, -ret, "%s: Failed to build initial schib", 133 __func__); 134 goto out_err; 135 } 136 137 ck->realize(ccw_dev, &err); 138 if (err) { 139 goto out_err; 140 } 141 142 css_generate_sch_crws(sch->cssid, sch->ssid, sch->schid, 143 parent->hotplugged, 1); 144 return; 145 146 out_err: 147 css_subch_assign(sch->cssid, sch->ssid, sch->schid, sch->devno, NULL); 148 ccw_dev->sch = NULL; 149 g_free(sch); 150 out_mdevid_free: 151 g_free(cdev->mdevid); 152 out_err_propagate: 153 error_propagate(errp, err); 154 } 155 156 static void s390_ccw_unrealize(S390CCWDevice *cdev) 157 { 158 CcwDevice *ccw_dev = CCW_DEVICE(cdev); 159 SubchDev *sch = ccw_dev->sch; 160 161 if (sch) { 162 css_subch_assign(sch->cssid, sch->ssid, sch->schid, sch->devno, NULL); 163 g_free(sch); 164 ccw_dev->sch = NULL; 165 } 166 167 g_free(cdev->mdevid); 168 } 169 170 static void s390_ccw_instance_init(Object *obj) 171 { 172 S390CCWDevice *dev = S390_CCW_DEVICE(obj); 173 174 device_add_bootindex_property(obj, &dev->bootindex, "bootindex", 175 "/disk@0,0", DEVICE(obj)); 176 } 177 178 static void s390_ccw_class_init(ObjectClass *klass, void *data) 179 { 180 DeviceClass *dc = DEVICE_CLASS(klass); 181 S390CCWDeviceClass *cdc = S390_CCW_DEVICE_CLASS(klass); 182 183 dc->bus_type = TYPE_VIRTUAL_CSS_BUS; 184 cdc->realize = s390_ccw_realize; 185 cdc->unrealize = s390_ccw_unrealize; 186 } 187 188 static const TypeInfo s390_ccw_info = { 189 .name = TYPE_S390_CCW, 190 .parent = TYPE_CCW_DEVICE, 191 .instance_init = s390_ccw_instance_init, 192 .instance_size = sizeof(S390CCWDevice), 193 .class_size = sizeof(S390CCWDeviceClass), 194 .class_init = s390_ccw_class_init, 195 .abstract = true, 196 }; 197 198 static void register_s390_ccw_type(void) 199 { 200 type_register_static(&s390_ccw_info); 201 } 202 203 type_init(register_s390_ccw_type) 204