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