drivers/s390/scsi/zfcp_cfdc.c

   1 /*
   2  * zfcp device driver
   3  *
   4  * Userspace interface for accessing the
   5  * Access Control Lists / Control File Data Channel;
   6  * handling of response code and states for ports and LUNs.
   7  *
   8  * Copyright IBM Corp. 2008, 2010
   9  */
  10
  11 #define KMSG_COMPONENT "zfcp"
  12 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  13
  14 #include <linux/compat.h>
  15 #include <linux/slab.h>
  16 #include <linux/types.h>
  17 #include <linux/miscdevice.h>
  18 #include <asm/compat.h>
  19 #include <asm/ccwdev.h>
  20 #include "zfcp_def.h"
  21 #include "zfcp_ext.h"
  22 #include "zfcp_fsf.h"
  23
  24 #define ZFCP_CFDC_CMND_DOWNLOAD_NORMAL          0x00010001
  25 #define ZFCP_CFDC_CMND_DOWNLOAD_FORCE           0x00010101
  26 #define ZFCP_CFDC_CMND_FULL_ACCESS              0x00000201
  27 #define ZFCP_CFDC_CMND_RESTRICTED_ACCESS        0x00000401
  28 #define ZFCP_CFDC_CMND_UPLOAD                   0x00010002
  29
  30 #define ZFCP_CFDC_DOWNLOAD                      0x00000001
  31 #define ZFCP_CFDC_UPLOAD                        0x00000002
  32 #define ZFCP_CFDC_WITH_CONTROL_FILE             0x00010000
  33
  34 #define ZFCP_CFDC_IOC_MAGIC                     0xDD
  35 #define ZFCP_CFDC_IOC \
  36         _IOWR(ZFCP_CFDC_IOC_MAGIC, 0, struct zfcp_cfdc_data)
  37
  38 /**
  39  * struct zfcp_cfdc_data - data for ioctl cfdc interface
  40  * @signature: request signature
  41  * @devno: FCP adapter device number
  42  * @command: command code
  43  * @fsf_status: returns status of FSF command to userspace
  44  * @fsf_status_qual: returned to userspace
  45  * @payloads: access conflicts list
  46  * @control_file: access control table
  47  */
  48 struct zfcp_cfdc_data {
  49         u32 signature;
  50         u32 devno;
  51         u32 command;
  52         u32 fsf_status;
  53         u8  fsf_status_qual[FSF_STATUS_QUALIFIER_SIZE];
  54         u8  payloads[256];
  55         u8  control_file[0];
  56 };
  57
  58 static int zfcp_cfdc_copy_from_user(struct scatterlist *sg,
  59                                     void __user *user_buffer)
  60 {
  61         unsigned int length;
  62         unsigned int size = ZFCP_CFDC_MAX_SIZE;
  63
  64         while (size) {
  65                 length = min((unsigned int)size, sg->length);
  66                 if (copy_from_user(sg_virt(sg++), user_buffer, length))
  67                         return -EFAULT;
  68                 user_buffer += length;
  69                 size -= length;
  70         }
  71         return 0;
  72 }
  73
  74 static int zfcp_cfdc_copy_to_user(void __user  *user_buffer,
  75                                   struct scatterlist *sg)
  76 {
  77         unsigned int length;
  78         unsigned int size = ZFCP_CFDC_MAX_SIZE;
  79
  80         while (size) {
  81                 length = min((unsigned int) size, sg->length);
  82                 if (copy_to_user(user_buffer, sg_virt(sg++), length))
  83                         return -EFAULT;
  84                 user_buffer += length;
  85                 size -= length;
  86         }
  87         return 0;
  88 }
  89
  90 static struct zfcp_adapter *zfcp_cfdc_get_adapter(u32 devno)
  91 {
  92         char busid[9];
  93         struct ccw_device *cdev;
  94         struct zfcp_adapter *adapter;
  95
  96         snprintf(busid, sizeof(busid), "0.0.%04x", devno);
  97         cdev = get_ccwdev_by_busid(&zfcp_ccw_driver, busid);
  98         if (!cdev)
  99                 return NULL;
 100
 101         adapter = zfcp_ccw_adapter_by_cdev(cdev);
 102
 103         put_device(&cdev->dev);
 104         return adapter;
 105 }
 106
 107 static int zfcp_cfdc_set_fsf(struct zfcp_fsf_cfdc *fsf_cfdc, int command)
 108 {
 109         switch (command) {
 110         case ZFCP_CFDC_CMND_DOWNLOAD_NORMAL:
 111                 fsf_cfdc->command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
 112                 fsf_cfdc->option = FSF_CFDC_OPTION_NORMAL_MODE;
 113                 break;
 114         case ZFCP_CFDC_CMND_DOWNLOAD_FORCE:
 115                 fsf_cfdc->command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
 116                 fsf_cfdc->option = FSF_CFDC_OPTION_FORCE;
 117                 break;
 118         case ZFCP_CFDC_CMND_FULL_ACCESS:
 119                 fsf_cfdc->command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
 120                 fsf_cfdc->option = FSF_CFDC_OPTION_FULL_ACCESS;
 121                 break;
 122         case ZFCP_CFDC_CMND_RESTRICTED_ACCESS:
 123                 fsf_cfdc->command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
 124                 fsf_cfdc->option = FSF_CFDC_OPTION_RESTRICTED_ACCESS;
 125                 break;
 126         case ZFCP_CFDC_CMND_UPLOAD:
 127                 fsf_cfdc->command = FSF_QTCB_UPLOAD_CONTROL_FILE;
 128                 fsf_cfdc->option = 0;
 129                 break;
 130         default:
 131                 return -EINVAL;
 132         }
 133
 134         return 0;
 135 }
 136
 137 static int zfcp_cfdc_sg_setup(int command, struct scatterlist *sg,
 138                               u8 __user *control_file)
 139 {
 140         int retval;
 141         retval = zfcp_sg_setup_table(sg, ZFCP_CFDC_PAGES);
 142         if (retval)
 143                 return retval;
 144
 145         sg[ZFCP_CFDC_PAGES - 1].length = ZFCP_CFDC_MAX_SIZE % PAGE_SIZE;
 146
 147         if (command & ZFCP_CFDC_WITH_CONTROL_FILE &&
 148             command & ZFCP_CFDC_DOWNLOAD) {
 149                 retval = zfcp_cfdc_copy_from_user(sg, control_file);
 150                 if (retval) {
 151                         zfcp_sg_free_table(sg, ZFCP_CFDC_PAGES);
 152                         return -EFAULT;
 153                 }
 154         }
 155
 156         return 0;
 157 }
 158
 159 static void zfcp_cfdc_req_to_sense(struct zfcp_cfdc_data *data,
 160                                    struct zfcp_fsf_req *req)
 161 {
 162         data->fsf_status = req->qtcb->header.fsf_status;
 163         memcpy(&data->fsf_status_qual, &req->qtcb->header.fsf_status_qual,
 164                sizeof(union fsf_status_qual));
 165         memcpy(&data->payloads, &req->qtcb->bottom.support.els,
 166                sizeof(req->qtcb->bottom.support.els));
 167 }
 168
 169 static long zfcp_cfdc_dev_ioctl(struct file *file, unsigned int command,
 170                                 unsigned long arg)
 171 {
 172         struct zfcp_cfdc_data *data;
 173         struct zfcp_cfdc_data __user *data_user;
 174         struct zfcp_adapter *adapter;
 175         struct zfcp_fsf_req *req;
 176         struct zfcp_fsf_cfdc *fsf_cfdc;
 177         int retval;
 178
 179         if (command != ZFCP_CFDC_IOC)
 180                 return -ENOTTY;
 181
 182         if (is_compat_task())
 183                 data_user = compat_ptr(arg);
 184         else
 185                 data_user = (void __user *)arg;
 186
 187         if (!data_user)
 188                 return -EINVAL;
 189
 190         fsf_cfdc = kmalloc(sizeof(struct zfcp_fsf_cfdc), GFP_KERNEL);
 191         if (!fsf_cfdc)
 192                 return -ENOMEM;
 193
 194         data = memdup_user(data_user, sizeof(*data_user));
 195         if (IS_ERR(data)) {
 196                 retval = PTR_ERR(data);
 197                 goto no_mem_sense;
 198         }
 199
 200         if (data->signature != 0xCFDCACDF) {
 201                 retval = -EINVAL;
 202                 goto free_buffer;
 203         }
 204
 205         retval = zfcp_cfdc_set_fsf(fsf_cfdc, data->command);
 206
 207         adapter = zfcp_cfdc_get_adapter(data->devno);
 208         if (!adapter) {
 209                 retval = -ENXIO;
 210                 goto free_buffer;
 211         }
 212
 213         retval = zfcp_cfdc_sg_setup(data->command, fsf_cfdc->sg,
 214                                     data_user->control_file);
 215         if (retval)
 216                 goto adapter_put;
 217         req = zfcp_fsf_control_file(adapter, fsf_cfdc);
 218         if (IS_ERR(req)) {
 219                 retval = PTR_ERR(req);
 220                 goto free_sg;
 221         }
 222
 223         if (req->status & ZFCP_STATUS_FSFREQ_ERROR) {
 224                 retval = -ENXIO;
 225                 goto free_fsf;
 226         }
 227
 228         zfcp_cfdc_req_to_sense(data, req);
 229         retval = copy_to_user(data_user, data, sizeof(*data_user));
 230         if (retval) {
 231                 retval = -EFAULT;
 232                 goto free_fsf;
 233         }
 234
 235         if (data->command & ZFCP_CFDC_UPLOAD)
 236                 retval = zfcp_cfdc_copy_to_user(&data_user->control_file,
 237                                                 fsf_cfdc->sg);
 238
 239  free_fsf:
 240         zfcp_fsf_req_free(req);
 241  free_sg:
 242         zfcp_sg_free_table(fsf_cfdc->sg, ZFCP_CFDC_PAGES);
 243  adapter_put:
 244         zfcp_ccw_adapter_put(adapter);
 245  free_buffer:
 246         kfree(data);
 247  no_mem_sense:
 248         kfree(fsf_cfdc);
 249         return retval;
 250 }
 251
 252 static const struct file_operations zfcp_cfdc_fops = {
 253         .open = nonseekable_open,
 254         .unlocked_ioctl = zfcp_cfdc_dev_ioctl,
 255 #ifdef CONFIG_COMPAT
 256         .compat_ioctl = zfcp_cfdc_dev_ioctl,
 257 #endif
 258         .llseek = no_llseek,
 259 };
 260
 261 struct miscdevice zfcp_cfdc_misc = {
 262         .minor = MISC_DYNAMIC_MINOR,
 263         .name = "zfcp_cfdc",
 264         .fops = &zfcp_cfdc_fops,
 265 };
 266
 267 /**
 268  * zfcp_cfdc_adapter_access_changed - Process change in adapter ACT
 269  * @adapter: Adapter where the Access Control Table (ACT) changed
 270  *
 271  * After a change in the adapter ACT, check if access to any
 272  * previously denied resources is now possible.
 273  */
 274 void zfcp_cfdc_adapter_access_changed(struct zfcp_adapter *adapter)
 275 {
 276         unsigned long flags;
 277         struct zfcp_port *port;
 278         struct scsi_device *sdev;
 279         struct zfcp_scsi_dev *zfcp_sdev;
 280         int status;
 281
 282         if (adapter->connection_features & FSF_FEATURE_NPIV_MODE)
 283                 return;
 284
 285         read_lock_irqsave(&adapter->port_list_lock, flags);
 286         list_for_each_entry(port, &adapter->port_list, list) {
 287                 status = atomic_read(&port->status);
 288                 if ((status & ZFCP_STATUS_COMMON_ACCESS_DENIED) ||
 289                     (status & ZFCP_STATUS_COMMON_ACCESS_BOXED))
 290                         zfcp_erp_port_reopen(port,
 291                                              ZFCP_STATUS_COMMON_ERP_FAILED,
 292                                              "cfaac_1");
 293         }
 294         read_unlock_irqrestore(&adapter->port_list_lock, flags);
 295
 296         shost_for_each_device(sdev, adapter->scsi_host) {
 297                 zfcp_sdev = sdev_to_zfcp(sdev);
 298                 status = atomic_read(&zfcp_sdev->status);
 299                 if ((status & ZFCP_STATUS_COMMON_ACCESS_DENIED) ||
 300                     (status & ZFCP_STATUS_COMMON_ACCESS_BOXED))
 301                         zfcp_erp_lun_reopen(sdev,
 302                                             ZFCP_STATUS_COMMON_ERP_FAILED,
 303                                             "cfaac_2");
 304         }
 305 }
 306
 307 static void zfcp_act_eval_err(struct zfcp_adapter *adapter, u32 table)
 308 {
 309         u16 subtable = table >> 16;
 310         u16 rule = table & 0xffff;
 311         const char *act_type[] = { "unknown", "OS", "WWPN", "DID", "LUN" };
 312
 313         if (subtable && subtable < ARRAY_SIZE(act_type))
 314                 dev_warn(&adapter->ccw_device->dev,
 315                          "Access denied according to ACT rule type %s, "
 316                          "rule %d\n", act_type[subtable], rule);
 317 }
 318
 319 /**
 320  * zfcp_cfdc_port_denied - Process "access denied" for port
 321  * @port: The port where the access has been denied
 322  * @qual: The FSF status qualifier for the access denied FSF status
 323  */
 324 void zfcp_cfdc_port_denied(struct zfcp_port *port,
 325                            union fsf_status_qual *qual)
 326 {
 327         dev_warn(&port->adapter->ccw_device->dev,
 328                  "Access denied to port 0x%016Lx\n",
 329                  (unsigned long long)port->wwpn);
 330
 331         zfcp_act_eval_err(port->adapter, qual->halfword[0]);
 332         zfcp_act_eval_err(port->adapter, qual->halfword[1]);
 333         zfcp_erp_set_port_status(port,
 334                                  ZFCP_STATUS_COMMON_ERP_FAILED |
 335                                  ZFCP_STATUS_COMMON_ACCESS_DENIED);
 336 }
 337
 338 /**
 339  * zfcp_cfdc_lun_denied - Process "access denied" for LUN
 340  * @sdev: The SCSI device / LUN where the access has been denied
 341  * @qual: The FSF status qualifier for the access denied FSF status
 342  */
 343 void zfcp_cfdc_lun_denied(struct scsi_device *sdev,
 344                           union fsf_status_qual *qual)
 345 {
 346         struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
 347
 348         dev_warn(&zfcp_sdev->port->adapter->ccw_device->dev,
 349                  "Access denied to LUN 0x%016Lx on port 0x%016Lx\n",
 350                  zfcp_scsi_dev_lun(sdev),
 351                  (unsigned long long)zfcp_sdev->port->wwpn);
 352         zfcp_act_eval_err(zfcp_sdev->port->adapter, qual->halfword[0]);
 353         zfcp_act_eval_err(zfcp_sdev->port->adapter, qual->halfword[1]);
 354         zfcp_erp_set_lun_status(sdev,
 355                                 ZFCP_STATUS_COMMON_ERP_FAILED |
 356                                 ZFCP_STATUS_COMMON_ACCESS_DENIED);
 357
 358         atomic_clear_mask(ZFCP_STATUS_LUN_SHARED, &zfcp_sdev->status);
 359         atomic_clear_mask(ZFCP_STATUS_LUN_READONLY, &zfcp_sdev->status);
 360 }
 361
 362 /**
 363  * zfcp_cfdc_lun_shrng_vltn - Evaluate LUN sharing violation status
 364  * @sdev: The LUN / SCSI device where sharing violation occurred
 365  * @qual: The FSF status qualifier from the LUN sharing violation
 366  */
 367 void zfcp_cfdc_lun_shrng_vltn(struct scsi_device *sdev,
 368                               union fsf_status_qual *qual)
 369 {
 370         struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
 371
 372         if (qual->word[0])
 373                 dev_warn(&zfcp_sdev->port->adapter->ccw_device->dev,
 374                          "LUN 0x%Lx on port 0x%Lx is already in "
 375                          "use by CSS%d, MIF Image ID %x\n",
 376                          zfcp_scsi_dev_lun(sdev),
 377                          (unsigned long long)zfcp_sdev->port->wwpn,
 378                          qual->fsf_queue_designator.cssid,
 379                          qual->fsf_queue_designator.hla);
 380         else
 381                 zfcp_act_eval_err(zfcp_sdev->port->adapter, qual->word[2]);
 382
 383         zfcp_erp_set_lun_status(sdev,
 384                                 ZFCP_STATUS_COMMON_ERP_FAILED |
 385                                 ZFCP_STATUS_COMMON_ACCESS_DENIED);
 386         atomic_clear_mask(ZFCP_STATUS_LUN_SHARED, &zfcp_sdev->status);
 387         atomic_clear_mask(ZFCP_STATUS_LUN_READONLY, &zfcp_sdev->status);
 388 }
 389
 390 /**
 391  * zfcp_cfdc_open_lun_eval - Eval access ctrl. status for successful "open lun"
 392  * @sdev: The SCSI device / LUN where to evaluate the status
 393  * @bottom: The qtcb bottom with the status from the "open lun"
 394  *
 395  * Returns: 0 if LUN is usable, -EACCES if the access control table
 396  *          reports an unsupported configuration.
 397  */
 398 int zfcp_cfdc_open_lun_eval(struct scsi_device *sdev,
 399                             struct fsf_qtcb_bottom_support *bottom)
 400 {
 401         int shared, rw;
 402         struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
 403         struct zfcp_adapter *adapter = zfcp_sdev->port->adapter;
 404
 405         if ((adapter->connection_features & FSF_FEATURE_NPIV_MODE) ||
 406             !(adapter->adapter_features & FSF_FEATURE_LUN_SHARING) ||
 407             zfcp_ccw_priv_sch(adapter))
 408                 return 0;
 409
 410         shared = !(bottom->lun_access_info & FSF_UNIT_ACCESS_EXCLUSIVE);
 411         rw = (bottom->lun_access_info & FSF_UNIT_ACCESS_OUTBOUND_TRANSFER);
 412
 413         if (shared)
 414                 atomic_set_mask(ZFCP_STATUS_LUN_SHARED, &zfcp_sdev->status);
 415
 416         if (!rw) {
 417                 atomic_set_mask(ZFCP_STATUS_LUN_READONLY, &zfcp_sdev->status);
 418                 dev_info(&adapter->ccw_device->dev, "SCSI device at LUN "
 419                          "0x%016Lx on port 0x%016Lx opened read-only\n",
 420                          zfcp_scsi_dev_lun(sdev),
 421                          (unsigned long long)zfcp_sdev->port->wwpn);
 422         }
 423
 424         if (!shared && !rw) {
 425                 dev_err(&adapter->ccw_device->dev, "Exclusive read-only access "
 426                         "not supported (LUN 0x%016Lx, port 0x%016Lx)\n",
 427                         zfcp_scsi_dev_lun(sdev),
 428                         (unsigned long long)zfcp_sdev->port->wwpn);
 429                 zfcp_erp_set_lun_status(sdev, ZFCP_STATUS_COMMON_ERP_FAILED);
 430                 zfcp_erp_lun_shutdown(sdev, 0, "fsouh_6");
 431                 return -EACCES;
 432         }
 433
 434         if (shared && rw) {
 435                 dev_err(&adapter->ccw_device->dev,
 436                         "Shared read-write access not supported "
 437                         "(LUN 0x%016Lx, port 0x%016Lx)\n",
 438                         zfcp_scsi_dev_lun(sdev),
 439                         (unsigned long long)zfcp_sdev->port->wwpn);
 440                 zfcp_erp_set_lun_status(sdev, ZFCP_STATUS_COMMON_ERP_FAILED);
 441                 zfcp_erp_lun_shutdown(sdev, 0, "fsosh_8");
 442                 return -EACCES;
 443         }
 444
 445         return 0;
 446 }