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/s390x/css.h" 19 #include "hw/s390x/css-bridge.h" 20 #include "hw/s390x/s390-ccw.h" 21 #include "sysemu/sysemu.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 IOInstEnding s390_ccw_store(SubchDev *sch) 54 { 55 S390CCWDeviceClass *cdc = NULL; 56 int ret = IOINST_CC_EXPECTED; 57 58 /* 59 * This code is called for both virtual and passthrough devices, 60 * but only applies to the latter. This ugly check makes that 61 * distinction for us. 62 */ 63 if (object_dynamic_cast(OBJECT(sch->driver_data), TYPE_S390_CCW)) { 64 cdc = S390_CCW_DEVICE_GET_CLASS(sch->driver_data); 65 } 66 67 if (cdc && cdc->handle_store) { 68 ret = cdc->handle_store(sch); 69 } 70 71 return ret; 72 } 73 74 static bool s390_ccw_get_dev_info(S390CCWDevice *cdev, 75 char *sysfsdev, 76 Error **errp) 77 { 78 unsigned int cssid, ssid, devid; 79 char dev_path[PATH_MAX] = {0}; 80 g_autofree char *tmp_dir = NULL; 81 g_autofree char *tmp = NULL; 82 83 if (!sysfsdev) { 84 error_setg(errp, "No host device provided"); 85 error_append_hint(errp, 86 "Use -device vfio-ccw,sysfsdev=PATH_TO_DEVICE\n"); 87 return false; 88 } 89 90 if (!realpath(sysfsdev, dev_path)) { 91 error_setg_errno(errp, errno, "Host device '%s' not found", sysfsdev); 92 return false; 93 } 94 95 cdev->mdevid = g_path_get_basename(dev_path); 96 97 tmp_dir = g_path_get_dirname(dev_path); 98 tmp = g_path_get_basename(tmp_dir); 99 if (sscanf(tmp, "%2x.%1x.%4x", &cssid, &ssid, &devid) != 3) { 100 error_setg_errno(errp, errno, "Failed to read %s", tmp); 101 return false; 102 } 103 104 cdev->hostid.cssid = cssid; 105 cdev->hostid.ssid = ssid; 106 cdev->hostid.devid = devid; 107 cdev->hostid.valid = true; 108 return true; 109 } 110 111 static bool s390_ccw_realize(S390CCWDevice *cdev, char *sysfsdev, Error **errp) 112 { 113 CcwDevice *ccw_dev = CCW_DEVICE(cdev); 114 CCWDeviceClass *ck = CCW_DEVICE_GET_CLASS(ccw_dev); 115 DeviceState *parent = DEVICE(ccw_dev); 116 SubchDev *sch; 117 int ret; 118 119 if (!s390_ccw_get_dev_info(cdev, sysfsdev, errp)) { 120 return false; 121 } 122 123 sch = css_create_sch(ccw_dev->devno, errp); 124 if (!sch) { 125 goto out_mdevid_free; 126 } 127 sch->driver_data = cdev; 128 sch->do_subchannel_work = do_subchannel_work_passthrough; 129 sch->irb_cb = build_irb_passthrough; 130 131 ccw_dev->sch = sch; 132 ret = css_sch_build_schib(sch, &cdev->hostid); 133 if (ret) { 134 error_setg_errno(errp, -ret, "%s: Failed to build initial schib", 135 __func__); 136 goto out_err; 137 } 138 139 if (!ck->realize(ccw_dev, errp)) { 140 goto out_err; 141 } 142 143 css_generate_sch_crws(sch->cssid, sch->ssid, sch->schid, 144 parent->hotplugged, 1); 145 return true; 146 147 out_err: 148 css_subch_assign(sch->cssid, sch->ssid, sch->schid, sch->devno, NULL); 149 ccw_dev->sch = NULL; 150 g_free(sch); 151 out_mdevid_free: 152 g_free(cdev->mdevid); 153 return false; 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 S390CCWDeviceClass *cdc = S390_CCW_DEVICE_CLASS(klass); 181 182 cdc->realize = s390_ccw_realize; 183 cdc->unrealize = s390_ccw_unrealize; 184 } 185 186 static const TypeInfo s390_ccw_info = { 187 .name = TYPE_S390_CCW, 188 .parent = TYPE_CCW_DEVICE, 189 .instance_init = s390_ccw_instance_init, 190 .instance_size = sizeof(S390CCWDevice), 191 .class_size = sizeof(S390CCWDeviceClass), 192 .class_init = s390_ccw_class_init, 193 .abstract = true, 194 }; 195 196 static void register_s390_ccw_type(void) 197 { 198 type_register_static(&s390_ccw_info); 199 } 200 201 type_init(register_s390_ccw_type) 202