1 /* 2 * zfcp device driver 3 * 4 * Registration and callback for the s390 common I/O layer. 5 * 6 * Copyright IBM Corporation 2002, 2008 7 */ 8 9 #include "zfcp_ext.h" 10 11 /** 12 * zfcp_ccw_probe - probe function of zfcp driver 13 * @ccw_device: pointer to belonging ccw device 14 * 15 * This function gets called by the common i/o layer and sets up the initial 16 * data structures for each fcp adapter, which was detected by the system. 17 * Also the sysfs files for this adapter will be created by this function. 18 * In addition the nameserver port will be added to the ports of the adapter 19 * and its sysfs representation will be created too. 20 */ 21 static int zfcp_ccw_probe(struct ccw_device *ccw_device) 22 { 23 int retval = 0; 24 25 down(&zfcp_data.config_sema); 26 if (zfcp_adapter_enqueue(ccw_device)) { 27 dev_err(&ccw_device->dev, 28 "Setup of data structures failed.\n"); 29 retval = -EINVAL; 30 } 31 up(&zfcp_data.config_sema); 32 return retval; 33 } 34 35 /** 36 * zfcp_ccw_remove - remove function of zfcp driver 37 * @ccw_device: pointer to belonging ccw device 38 * 39 * This function gets called by the common i/o layer and removes an adapter 40 * from the system. Task of this function is to get rid of all units and 41 * ports that belong to this adapter. And in addition all resources of this 42 * adapter will be freed too. 43 */ 44 static void zfcp_ccw_remove(struct ccw_device *ccw_device) 45 { 46 struct zfcp_adapter *adapter; 47 struct zfcp_port *port, *p; 48 struct zfcp_unit *unit, *u; 49 50 ccw_device_set_offline(ccw_device); 51 down(&zfcp_data.config_sema); 52 adapter = dev_get_drvdata(&ccw_device->dev); 53 54 write_lock_irq(&zfcp_data.config_lock); 55 list_for_each_entry_safe(port, p, &adapter->port_list_head, list) { 56 list_for_each_entry_safe(unit, u, &port->unit_list_head, list) { 57 list_move(&unit->list, &port->unit_remove_lh); 58 atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, 59 &unit->status); 60 } 61 list_move(&port->list, &adapter->port_remove_lh); 62 atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status); 63 } 64 atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &adapter->status); 65 write_unlock_irq(&zfcp_data.config_lock); 66 67 list_for_each_entry_safe(port, p, &adapter->port_remove_lh, list) { 68 list_for_each_entry_safe(unit, u, &port->unit_remove_lh, list) { 69 if (atomic_test_mask(ZFCP_STATUS_UNIT_REGISTERED, 70 &unit->status)) 71 scsi_remove_device(unit->device); 72 zfcp_unit_dequeue(unit); 73 } 74 zfcp_port_dequeue(port); 75 } 76 zfcp_adapter_wait(adapter); 77 zfcp_adapter_dequeue(adapter); 78 79 up(&zfcp_data.config_sema); 80 } 81 82 /** 83 * zfcp_ccw_set_online - set_online function of zfcp driver 84 * @ccw_device: pointer to belonging ccw device 85 * 86 * This function gets called by the common i/o layer and sets an adapter 87 * into state online. Setting an fcp device online means that it will be 88 * registered with the SCSI stack, that the QDIO queues will be set up 89 * and that the adapter will be opened (asynchronously). 90 */ 91 static int zfcp_ccw_set_online(struct ccw_device *ccw_device) 92 { 93 struct zfcp_adapter *adapter; 94 int retval; 95 96 down(&zfcp_data.config_sema); 97 adapter = dev_get_drvdata(&ccw_device->dev); 98 99 retval = zfcp_erp_thread_setup(adapter); 100 if (retval) 101 goto out; 102 103 retval = zfcp_adapter_scsi_register(adapter); 104 if (retval) 105 goto out_scsi_register; 106 107 /* initialize request counter */ 108 BUG_ON(!zfcp_reqlist_isempty(adapter)); 109 adapter->req_no = 0; 110 111 zfcp_erp_modify_adapter_status(adapter, 10, NULL, 112 ZFCP_STATUS_COMMON_RUNNING, ZFCP_SET); 113 zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED, 85, 114 NULL); 115 zfcp_erp_wait(adapter); 116 goto out; 117 118 out_scsi_register: 119 zfcp_erp_thread_kill(adapter); 120 out: 121 up(&zfcp_data.config_sema); 122 return retval; 123 } 124 125 /** 126 * zfcp_ccw_set_offline - set_offline function of zfcp driver 127 * @ccw_device: pointer to belonging ccw device 128 * 129 * This function gets called by the common i/o layer and sets an adapter 130 * into state offline. 131 */ 132 static int zfcp_ccw_set_offline(struct ccw_device *ccw_device) 133 { 134 struct zfcp_adapter *adapter; 135 136 down(&zfcp_data.config_sema); 137 adapter = dev_get_drvdata(&ccw_device->dev); 138 zfcp_erp_adapter_shutdown(adapter, 0, 86, NULL); 139 zfcp_erp_wait(adapter); 140 zfcp_erp_thread_kill(adapter); 141 up(&zfcp_data.config_sema); 142 return 0; 143 } 144 145 /** 146 * zfcp_ccw_notify - ccw notify function 147 * @ccw_device: pointer to belonging ccw device 148 * @event: indicates if adapter was detached or attached 149 * 150 * This function gets called by the common i/o layer if an adapter has gone 151 * or reappeared. 152 */ 153 static int zfcp_ccw_notify(struct ccw_device *ccw_device, int event) 154 { 155 struct zfcp_adapter *adapter; 156 157 down(&zfcp_data.config_sema); 158 adapter = dev_get_drvdata(&ccw_device->dev); 159 switch (event) { 160 case CIO_GONE: 161 dev_warn(&adapter->ccw_device->dev, "device gone\n"); 162 zfcp_erp_adapter_shutdown(adapter, 0, 87, NULL); 163 break; 164 case CIO_NO_PATH: 165 dev_warn(&adapter->ccw_device->dev, "no path\n"); 166 zfcp_erp_adapter_shutdown(adapter, 0, 88, NULL); 167 break; 168 case CIO_OPER: 169 dev_info(&adapter->ccw_device->dev, "operational again\n"); 170 zfcp_erp_modify_adapter_status(adapter, 11, NULL, 171 ZFCP_STATUS_COMMON_RUNNING, 172 ZFCP_SET); 173 zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED, 174 89, NULL); 175 break; 176 } 177 zfcp_erp_wait(adapter); 178 up(&zfcp_data.config_sema); 179 return 1; 180 } 181 182 /** 183 * zfcp_ccw_shutdown - handle shutdown from cio 184 * @cdev: device for adapter to shutdown. 185 */ 186 static void zfcp_ccw_shutdown(struct ccw_device *cdev) 187 { 188 struct zfcp_adapter *adapter; 189 190 down(&zfcp_data.config_sema); 191 adapter = dev_get_drvdata(&cdev->dev); 192 zfcp_erp_adapter_shutdown(adapter, 0, 90, NULL); 193 zfcp_erp_wait(adapter); 194 up(&zfcp_data.config_sema); 195 } 196 197 static struct ccw_device_id zfcp_ccw_device_id[] = { 198 { CCW_DEVICE_DEVTYPE(0x1731, 0x3, 0x1732, 0x3) }, 199 { CCW_DEVICE_DEVTYPE(0x1731, 0x3, 0x1732, 0x4) }, /* priv. */ 200 {}, 201 }; 202 203 MODULE_DEVICE_TABLE(ccw, zfcp_ccw_device_id); 204 205 static struct ccw_driver zfcp_ccw_driver = { 206 .owner = THIS_MODULE, 207 .name = "zfcp", 208 .ids = zfcp_ccw_device_id, 209 .probe = zfcp_ccw_probe, 210 .remove = zfcp_ccw_remove, 211 .set_online = zfcp_ccw_set_online, 212 .set_offline = zfcp_ccw_set_offline, 213 .notify = zfcp_ccw_notify, 214 .shutdown = zfcp_ccw_shutdown, 215 }; 216 217 /** 218 * zfcp_ccw_register - ccw register function 219 * 220 * Registers the driver at the common i/o layer. This function will be called 221 * at module load time/system start. 222 */ 223 int __init zfcp_ccw_register(void) 224 { 225 return ccw_driver_register(&zfcp_ccw_driver); 226 } 227