drivers/ide/ide-ioctls.c

   1 /*
   2  * IDE ioctls handling.
   3  */
   4
   5 #include <linux/hdreg.h>
   6 #include <linux/ide.h>
   7 #include <linux/slab.h>
   8
   9 static const struct ide_ioctl_devset ide_ioctl_settings[] = {
  10 { HDIO_GET_32BIT,        HDIO_SET_32BIT,        &ide_devset_io_32bit  },
  11 { HDIO_GET_KEEPSETTINGS, HDIO_SET_KEEPSETTINGS, &ide_devset_keepsettings },
  12 { HDIO_GET_UNMASKINTR,   HDIO_SET_UNMASKINTR,   &ide_devset_unmaskirq },
  13 { HDIO_GET_DMA,          HDIO_SET_DMA,          &ide_devset_using_dma },
  14 { -1,                    HDIO_SET_PIO_MODE,     &ide_devset_pio_mode  },
  15 { 0 }
  16 };
  17
  18 int ide_setting_ioctl(ide_drive_t *drive, struct block_device *bdev,
  19                       unsigned int cmd, unsigned long arg,
  20                       const struct ide_ioctl_devset *s)
  21 {
  22         const struct ide_devset *ds;
  23         int err = -EOPNOTSUPP;
  24
  25         for (; (ds = s->setting); s++) {
  26                 if (ds->get && s->get_ioctl == cmd)
  27                         goto read_val;
  28                 else if (ds->set && s->set_ioctl == cmd)
  29                         goto set_val;
  30         }
  31
  32         return err;
  33
  34 read_val:
  35         mutex_lock(&ide_setting_mtx);
  36         err = ds->get(drive);
  37         mutex_unlock(&ide_setting_mtx);
  38         return err >= 0 ? put_user(err, (long __user *)arg) : err;
  39
  40 set_val:
  41         if (bdev != bdev->bd_contains)
  42                 err = -EINVAL;
  43         else {
  44                 if (!capable(CAP_SYS_ADMIN))
  45                         err = -EACCES;
  46                 else {
  47                         mutex_lock(&ide_setting_mtx);
  48                         err = ide_devset_execute(drive, ds, arg);
  49                         mutex_unlock(&ide_setting_mtx);
  50                 }
  51         }
  52         return err;
  53 }
  54 EXPORT_SYMBOL_GPL(ide_setting_ioctl);
  55
  56 static int ide_get_identity_ioctl(ide_drive_t *drive, unsigned int cmd,
  57                                   unsigned long arg)
  58 {
  59         u16 *id = NULL;
  60         int size = (cmd == HDIO_GET_IDENTITY) ? (ATA_ID_WORDS * 2) : 142;
  61         int rc = 0;
  62
  63         if ((drive->dev_flags & IDE_DFLAG_ID_READ) == 0) {
  64                 rc = -ENOMSG;
  65                 goto out;
  66         }
  67
  68         /* ata_id_to_hd_driveid() relies on 'id' to be fully allocated. */
  69         id = kmalloc(ATA_ID_WORDS * 2, GFP_KERNEL);
  70         if (id == NULL) {
  71                 rc = -ENOMEM;
  72                 goto out;
  73         }
  74
  75         memcpy(id, drive->id, size);
  76         ata_id_to_hd_driveid(id);
  77
  78         if (copy_to_user((void __user *)arg, id, size))
  79                 rc = -EFAULT;
  80
  81         kfree(id);
  82 out:
  83         return rc;
  84 }
  85
  86 static int ide_get_nice_ioctl(ide_drive_t *drive, unsigned long arg)
  87 {
  88         return put_user((!!(drive->dev_flags & IDE_DFLAG_DSC_OVERLAP)
  89                          << IDE_NICE_DSC_OVERLAP) |
  90                         (!!(drive->dev_flags & IDE_DFLAG_NICE1)
  91                          << IDE_NICE_1), (long __user *)arg);
  92 }
  93
  94 static int ide_set_nice_ioctl(ide_drive_t *drive, unsigned long arg)
  95 {
  96         if (arg != (arg & ((1 << IDE_NICE_DSC_OVERLAP) | (1 << IDE_NICE_1))))
  97                 return -EPERM;
  98
  99         if (((arg >> IDE_NICE_DSC_OVERLAP) & 1) &&
 100             (drive->media != ide_tape))
 101                 return -EPERM;
 102
 103         if ((arg >> IDE_NICE_DSC_OVERLAP) & 1)
 104                 drive->dev_flags |= IDE_DFLAG_DSC_OVERLAP;
 105         else
 106                 drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP;
 107
 108         if ((arg >> IDE_NICE_1) & 1)
 109                 drive->dev_flags |= IDE_DFLAG_NICE1;
 110         else
 111                 drive->dev_flags &= ~IDE_DFLAG_NICE1;
 112
 113         return 0;
 114 }
 115
 116 static int ide_cmd_ioctl(ide_drive_t *drive, unsigned long arg)
 117 {
 118         u8 *buf = NULL;
 119         int bufsize = 0, err = 0;
 120         u8 args[4], xfer_rate = 0;
 121         struct ide_cmd cmd;
 122         struct ide_taskfile *tf = &cmd.tf;
 123
 124         if (NULL == (void *) arg) {
 125                 struct request *rq;
 126
 127                 rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
 128                 rq->cmd_type = REQ_TYPE_ATA_TASKFILE;
 129                 err = blk_execute_rq(drive->queue, NULL, rq, 0);
 130                 blk_put_request(rq);
 131
 132                 return err;
 133         }
 134
 135         if (copy_from_user(args, (void __user *)arg, 4))
 136                 return -EFAULT;
 137
 138         memset(&cmd, 0, sizeof(cmd));
 139         tf->feature = args[2];
 140         if (args[0] == ATA_CMD_SMART) {
 141                 tf->nsect = args[3];
 142                 tf->lbal  = args[1];
 143                 tf->lbam  = 0x4f;
 144                 tf->lbah  = 0xc2;
 145                 cmd.valid.out.tf = IDE_VALID_OUT_TF;
 146                 cmd.valid.in.tf  = IDE_VALID_NSECT;
 147         } else {
 148                 tf->nsect = args[1];
 149                 cmd.valid.out.tf = IDE_VALID_FEATURE | IDE_VALID_NSECT;
 150                 cmd.valid.in.tf  = IDE_VALID_NSECT;
 151         }
 152         tf->command = args[0];
 153         cmd.protocol = args[3] ? ATA_PROT_PIO : ATA_PROT_NODATA;
 154
 155         if (args[3]) {
 156                 cmd.tf_flags |= IDE_TFLAG_IO_16BIT;
 157                 bufsize = SECTOR_SIZE * args[3];
 158                 buf = kzalloc(bufsize, GFP_KERNEL);
 159                 if (buf == NULL)
 160                         return -ENOMEM;
 161         }
 162
 163         if (tf->command == ATA_CMD_SET_FEATURES &&
 164             tf->feature == SETFEATURES_XFER &&
 165             tf->nsect >= XFER_SW_DMA_0) {
 166                 xfer_rate = ide_find_dma_mode(drive, tf->nsect);
 167                 if (xfer_rate != tf->nsect) {
 168                         err = -EINVAL;
 169                         goto abort;
 170                 }
 171
 172                 cmd.tf_flags |= IDE_TFLAG_SET_XFER;
 173         }
 174
 175         err = ide_raw_taskfile(drive, &cmd, buf, args[3]);
 176
 177         args[0] = tf->status;
 178         args[1] = tf->error;
 179         args[2] = tf->nsect;
 180 abort:
 181         if (copy_to_user((void __user *)arg, &args, 4))
 182                 err = -EFAULT;
 183         if (buf) {
 184                 if (copy_to_user((void __user *)(arg + 4), buf, bufsize))
 185                         err = -EFAULT;
 186                 kfree(buf);
 187         }
 188         return err;
 189 }
 190
 191 static int ide_task_ioctl(ide_drive_t *drive, unsigned long arg)
 192 {
 193         void __user *p = (void __user *)arg;
 194         int err = 0;
 195         u8 args[7];
 196         struct ide_cmd cmd;
 197
 198         if (copy_from_user(args, p, 7))
 199                 return -EFAULT;
 200
 201         memset(&cmd, 0, sizeof(cmd));
 202         memcpy(&cmd.tf.feature, &args[1], 6);
 203         cmd.tf.command = args[0];
 204         cmd.valid.out.tf = IDE_VALID_OUT_TF | IDE_VALID_DEVICE;
 205         cmd.valid.in.tf  = IDE_VALID_IN_TF  | IDE_VALID_DEVICE;
 206
 207         err = ide_no_data_taskfile(drive, &cmd);
 208
 209         args[0] = cmd.tf.command;
 210         memcpy(&args[1], &cmd.tf.feature, 6);
 211
 212         if (copy_to_user(p, args, 7))
 213                 err = -EFAULT;
 214
 215         return err;
 216 }
 217
 218 static int generic_drive_reset(ide_drive_t *drive)
 219 {
 220         struct request *rq;
 221         int ret = 0;
 222
 223         rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
 224         rq->cmd_type = REQ_TYPE_SPECIAL;
 225         rq->cmd_len = 1;
 226         rq->cmd[0] = REQ_DRIVE_RESET;
 227         if (blk_execute_rq(drive->queue, NULL, rq, 1))
 228                 ret = rq->errors;
 229         blk_put_request(rq);
 230         return ret;
 231 }
 232
 233 int generic_ide_ioctl(ide_drive_t *drive, struct block_device *bdev,
 234                       unsigned int cmd, unsigned long arg)
 235 {
 236         int err;
 237
 238         err = ide_setting_ioctl(drive, bdev, cmd, arg, ide_ioctl_settings);
 239         if (err != -EOPNOTSUPP)
 240                 return err;
 241
 242         switch (cmd) {
 243         case HDIO_OBSOLETE_IDENTITY:
 244         case HDIO_GET_IDENTITY:
 245                 if (bdev != bdev->bd_contains)
 246                         return -EINVAL;
 247                 return ide_get_identity_ioctl(drive, cmd, arg);
 248         case HDIO_GET_NICE:
 249                 return ide_get_nice_ioctl(drive, arg);
 250         case HDIO_SET_NICE:
 251                 if (!capable(CAP_SYS_ADMIN))
 252                         return -EACCES;
 253                 return ide_set_nice_ioctl(drive, arg);
 254 #ifdef CONFIG_IDE_TASK_IOCTL
 255         case HDIO_DRIVE_TASKFILE:
 256                 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
 257                         return -EACCES;
 258                 if (drive->media == ide_disk)
 259                         return ide_taskfile_ioctl(drive, arg);
 260                 return -ENOMSG;
 261 #endif
 262         case HDIO_DRIVE_CMD:
 263                 if (!capable(CAP_SYS_RAWIO))
 264                         return -EACCES;
 265                 return ide_cmd_ioctl(drive, arg);
 266         case HDIO_DRIVE_TASK:
 267                 if (!capable(CAP_SYS_RAWIO))
 268                         return -EACCES;
 269                 return ide_task_ioctl(drive, arg);
 270         case HDIO_DRIVE_RESET:
 271                 if (!capable(CAP_SYS_ADMIN))
 272                         return -EACCES;
 273                 return generic_drive_reset(drive);
 274         case HDIO_GET_BUSSTATE:
 275                 if (!capable(CAP_SYS_ADMIN))
 276                         return -EACCES;
 277                 if (put_user(BUSSTATE_ON, (long __user *)arg))
 278                         return -EFAULT;
 279                 return 0;
 280         case HDIO_SET_BUSSTATE:
 281                 if (!capable(CAP_SYS_ADMIN))
 282                         return -EACCES;
 283                 return -EOPNOTSUPP;
 284         default:
 285                 return -EINVAL;
 286         }
 287 }
 288 EXPORT_SYMBOL(generic_ide_ioctl);