git.oblomov.eu Git - linux-2.6/blob - 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  *
   7  * Copyright IBM Corporation 2008
   8  */
   9
  10 #define KMSG_COMPONENT "zfcp"
  11 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  12
  13 #include <linux/types.h>
  14 #include <linux/miscdevice.h>
  15 #include <asm/ccwdev.h>
  16 #include "zfcp_def.h"
  17 #include "zfcp_ext.h"
  18 #include "zfcp_fsf.h"
  19
  20 #define ZFCP_CFDC_CMND_DOWNLOAD_NORMAL          0x00010001
  21 #define ZFCP_CFDC_CMND_DOWNLOAD_FORCE           0x00010101
  22 #define ZFCP_CFDC_CMND_FULL_ACCESS              0x00000201
  23 #define ZFCP_CFDC_CMND_RESTRICTED_ACCESS        0x00000401
  24 #define ZFCP_CFDC_CMND_UPLOAD                   0x00010002
  25
  26 #define ZFCP_CFDC_DOWNLOAD                      0x00000001
  27 #define ZFCP_CFDC_UPLOAD                        0x00000002
  28 #define ZFCP_CFDC_WITH_CONTROL_FILE             0x00010000
  29
  30 #define ZFCP_CFDC_IOC_MAGIC                     0xDD
  31 #define ZFCP_CFDC_IOC \
  32         _IOWR(ZFCP_CFDC_IOC_MAGIC, 0, struct zfcp_cfdc_data)
  33
  34 /**
  35  * struct zfcp_cfdc_data - data for ioctl cfdc interface
  36  * @signature: request signature
  37  * @devno: FCP adapter device number
  38  * @command: command code
  39  * @fsf_status: returns status of FSF command to userspace
  40  * @fsf_status_qual: returned to userspace
  41  * @payloads: access conflicts list
  42  * @control_file: access control table
  43  */
  44 struct zfcp_cfdc_data {
  45         u32 signature;
  46         u32 devno;
  47         u32 command;
  48         u32 fsf_status;
  49         u8  fsf_status_qual[FSF_STATUS_QUALIFIER_SIZE];
  50         u8  payloads[256];
  51         u8  control_file[0];
  52 };
  53
  54 static int zfcp_cfdc_copy_from_user(struct scatterlist *sg,
  55                                     void __user *user_buffer)
  56 {
  57         unsigned int length;
  58         unsigned int size = ZFCP_CFDC_MAX_SIZE;
  59
  60         while (size) {
  61                 length = min((unsigned int)size, sg->length);
  62                 if (copy_from_user(sg_virt(sg++), user_buffer, length))
  63                         return -EFAULT;
  64                 user_buffer += length;
  65                 size -= length;
  66         }
  67         return 0;
  68 }
  69
  70 static int zfcp_cfdc_copy_to_user(void __user  *user_buffer,
  71                                   struct scatterlist *sg)
  72 {
  73         unsigned int length;
  74         unsigned int size = ZFCP_CFDC_MAX_SIZE;
  75
  76         while (size) {
  77                 length = min((unsigned int) size, sg->length);
  78                 if (copy_to_user(user_buffer, sg_virt(sg++), length))
  79                         return -EFAULT;
  80                 user_buffer += length;
  81                 size -= length;
  82         }
  83         return 0;
  84 }
  85
  86 static struct zfcp_adapter *zfcp_cfdc_get_adapter(u32 devno)
  87 {
  88         struct zfcp_adapter *adapter = NULL, *cur_adapter;
  89         struct ccw_dev_id dev_id;
  90
  91         read_lock_irq(&zfcp_data.config_lock);
  92         list_for_each_entry(cur_adapter, &zfcp_data.adapter_list_head, list) {
  93                 ccw_device_get_id(cur_adapter->ccw_device, &dev_id);
  94                 if (dev_id.devno == devno) {
  95                         adapter = cur_adapter;
  96                         zfcp_adapter_get(adapter);
  97                         break;
  98                 }
  99         }
 100         read_unlock_irq(&zfcp_data.config_lock);
 101         return adapter;
 102 }
 103
 104 static int zfcp_cfdc_set_fsf(struct zfcp_fsf_cfdc *fsf_cfdc, int command)
 105 {
 106         switch (command) {
 107         case ZFCP_CFDC_CMND_DOWNLOAD_NORMAL:
 108                 fsf_cfdc->command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
 109                 fsf_cfdc->option = FSF_CFDC_OPTION_NORMAL_MODE;
 110                 break;
 111         case ZFCP_CFDC_CMND_DOWNLOAD_FORCE:
 112                 fsf_cfdc->command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
 113                 fsf_cfdc->option = FSF_CFDC_OPTION_FORCE;
 114                 break;
 115         case ZFCP_CFDC_CMND_FULL_ACCESS:
 116                 fsf_cfdc->command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
 117                 fsf_cfdc->option = FSF_CFDC_OPTION_FULL_ACCESS;
 118                 break;
 119         case ZFCP_CFDC_CMND_RESTRICTED_ACCESS:
 120                 fsf_cfdc->command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
 121                 fsf_cfdc->option = FSF_CFDC_OPTION_RESTRICTED_ACCESS;
 122                 break;
 123         case ZFCP_CFDC_CMND_UPLOAD:
 124                 fsf_cfdc->command = FSF_QTCB_UPLOAD_CONTROL_FILE;
 125                 fsf_cfdc->option = 0;
 126                 break;
 127         default:
 128                 return -EINVAL;
 129         }
 130
 131         return 0;
 132 }
 133
 134 static int zfcp_cfdc_sg_setup(int command, struct scatterlist *sg,
 135                               u8 __user *control_file)
 136 {
 137         int retval;
 138         retval = zfcp_sg_setup_table(sg, ZFCP_CFDC_PAGES);
 139         if (retval)
 140                 return retval;
 141
 142         sg[ZFCP_CFDC_PAGES - 1].length = ZFCP_CFDC_MAX_SIZE % PAGE_SIZE;
 143
 144         if (command & ZFCP_CFDC_WITH_CONTROL_FILE &&
 145             command & ZFCP_CFDC_DOWNLOAD) {
 146                 retval = zfcp_cfdc_copy_from_user(sg, control_file);
 147                 if (retval) {
 148                         zfcp_sg_free_table(sg, ZFCP_CFDC_PAGES);
 149                         return -EFAULT;
 150                 }
 151         }
 152
 153         return 0;
 154 }
 155
 156 static void zfcp_cfdc_req_to_sense(struct zfcp_cfdc_data *data,
 157                                    struct zfcp_fsf_req *req)
 158 {
 159         data->fsf_status = req->qtcb->header.fsf_status;
 160         memcpy(&data->fsf_status_qual, &req->qtcb->header.fsf_status_qual,
 161                sizeof(union fsf_status_qual));
 162         memcpy(&data->payloads, &req->qtcb->bottom.support.els,
 163                sizeof(req->qtcb->bottom.support.els));
 164 }
 165
 166 static long zfcp_cfdc_dev_ioctl(struct file *file, unsigned int command,
 167                                 unsigned long buffer)
 168 {
 169         struct zfcp_cfdc_data *data;
 170         struct zfcp_cfdc_data __user *data_user;
 171         struct zfcp_adapter *adapter;
 172         struct zfcp_fsf_req *req;
 173         struct zfcp_fsf_cfdc *fsf_cfdc;
 174         int retval;
 175
 176         if (command != ZFCP_CFDC_IOC)
 177                 return -ENOTTY;
 178
 179         data_user = (void __user *) buffer;
 180         if (!data_user)
 181                 return -EINVAL;
 182
 183         fsf_cfdc = kmalloc(sizeof(struct zfcp_fsf_cfdc), GFP_KERNEL);
 184         if (!fsf_cfdc)
 185                 return -ENOMEM;
 186
 187         data = kmalloc(sizeof(struct zfcp_cfdc_data), GFP_KERNEL);
 188         if (!data) {
 189                 retval = -ENOMEM;
 190                 goto no_mem_sense;
 191         }
 192
 193         retval = copy_from_user(data, data_user, sizeof(*data));
 194         if (retval) {
 195                 retval = -EFAULT;
 196                 goto free_buffer;
 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_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         .unlocked_ioctl = zfcp_cfdc_dev_ioctl,
 253 #ifdef CONFIG_COMPAT
 254         .compat_ioctl = zfcp_cfdc_dev_ioctl
 255 #endif
 256 };
 257
 258 struct miscdevice zfcp_cfdc_misc = {
 259         .minor = MISC_DYNAMIC_MINOR,
 260         .name = "zfcp_cfdc",
 261         .fops = &zfcp_cfdc_fops,
 262 };