SAFE public projects git trees. - safe/jmp/linux-2.6/blob - drivers/ide/ide-ioctls.c

   1 /*
   2  * IDE ioctls handling.
   3  */
   4
   5 #include <linux/hdreg.h>
   6 #include <linux/ide.h>
   7
   8 static const struct ide_ioctl_devset ide_ioctl_settings[] = {
   9 { HDIO_GET_32BIT,        HDIO_SET_32BIT,        get_io_32bit,  set_io_32bit  },
  10 { HDIO_GET_KEEPSETTINGS, HDIO_SET_KEEPSETTINGS, get_ksettings, set_ksettings },
  11 { HDIO_GET_UNMASKINTR,   HDIO_SET_UNMASKINTR,   get_unmaskirq, set_unmaskirq },
  12 { HDIO_GET_DMA,          HDIO_SET_DMA,          get_using_dma, set_using_dma },
  13 { -1,                    HDIO_SET_PIO_MODE,     NULL,          set_pio_mode  },
  14 { 0 }
  15 };
  16
  17 int ide_setting_ioctl(ide_drive_t *drive, struct block_device *bdev,
  18                       unsigned int cmd, unsigned long arg,
  19                       const struct ide_ioctl_devset *s)
  20 {
  21         unsigned long flags;
  22         int err = -EOPNOTSUPP;
  23
  24         for (; s->get_ioctl; s++) {
  25                 if (s->get && s->get_ioctl == cmd)
  26                         goto read_val;
  27                 else if (s->set && s->set_ioctl == cmd)
  28                         goto set_val;
  29         }
  30
  31         return err;
  32
  33 read_val:
  34         mutex_lock(&ide_setting_mtx);
  35         spin_lock_irqsave(&ide_lock, flags);
  36         err = s->get(drive);
  37         spin_unlock_irqrestore(&ide_lock, flags);
  38         mutex_unlock(&ide_setting_mtx);
  39         return err >= 0 ? put_user(err, (long __user *)arg) : err;
  40
  41 set_val:
  42         if (bdev != bdev->bd_contains)
  43                 err = -EINVAL;
  44         else {
  45                 if (!capable(CAP_SYS_ADMIN))
  46                         err = -EACCES;
  47                 else {
  48                         mutex_lock(&ide_setting_mtx);
  49                         err = s->set(drive, arg);
  50                         mutex_unlock(&ide_setting_mtx);
  51                 }
  52         }
  53         return err;
  54 }
  55 EXPORT_SYMBOL_GPL(ide_setting_ioctl);
  56
  57 static int ide_get_identity_ioctl(ide_drive_t *drive, unsigned int cmd,
  58                                   unsigned long arg)
  59 {
  60         u16 *id = NULL;
  61         int size = (cmd == HDIO_GET_IDENTITY) ? (ATA_ID_WORDS * 2) : 142;
  62         int rc = 0;
  63
  64         if (drive->id_read == 0) {
  65                 rc = -ENOMSG;
  66                 goto out;
  67         }
  68
  69         id = kmalloc(size, 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->dsc_overlap << IDE_NICE_DSC_OVERLAP) |
  89                         (drive->nice1 << IDE_NICE_1), (long __user *)arg);
  90 }
  91
  92 static int ide_set_nice_ioctl(ide_drive_t *drive, unsigned long arg)
  93 {
  94         if (arg != (arg & ((1 << IDE_NICE_DSC_OVERLAP) | (1 << IDE_NICE_1))))
  95                 return -EPERM;
  96
  97         if (((arg >> IDE_NICE_DSC_OVERLAP) & 1) &&
  98             (drive->media == ide_disk || drive->media == ide_floppy ||
  99              drive->scsi))
 100                 return -EPERM;
 101
 102         drive->dsc_overlap = (arg >> IDE_NICE_DSC_OVERLAP) & 1;
 103         drive->nice1 = (arg >> IDE_NICE_1) & 1;
 104
 105         return 0;
 106 }
 107
 108 static int ide_cmd_ioctl(ide_drive_t *drive, unsigned cmd, unsigned long arg)
 109 {
 110         u8 *buf = NULL;
 111         int bufsize = 0, err = 0;
 112         u8 args[4], xfer_rate = 0;
 113         ide_task_t tfargs;
 114         struct ide_taskfile *tf = &tfargs.tf;
 115         u16 *id = drive->id;
 116
 117         if (NULL == (void *) arg) {
 118                 struct request *rq;
 119
 120                 rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
 121                 rq->cmd_type = REQ_TYPE_ATA_TASKFILE;
 122                 err = blk_execute_rq(drive->queue, NULL, rq, 0);
 123                 blk_put_request(rq);
 124
 125                 return err;
 126         }
 127
 128         if (copy_from_user(args, (void __user *)arg, 4))
 129                 return -EFAULT;
 130
 131         memset(&tfargs, 0, sizeof(ide_task_t));
 132         tf->feature = args[2];
 133         if (args[0] == ATA_CMD_SMART) {
 134                 tf->nsect = args[3];
 135                 tf->lbal  = args[1];
 136                 tf->lbam  = 0x4f;
 137                 tf->lbah  = 0xc2;
 138                 tfargs.tf_flags = IDE_TFLAG_OUT_TF | IDE_TFLAG_IN_NSECT;
 139         } else {
 140                 tf->nsect = args[1];
 141                 tfargs.tf_flags = IDE_TFLAG_OUT_FEATURE |
 142                                   IDE_TFLAG_OUT_NSECT | IDE_TFLAG_IN_NSECT;
 143         }
 144         tf->command = args[0];
 145         tfargs.data_phase = args[3] ? TASKFILE_IN : TASKFILE_NO_DATA;
 146
 147         if (args[3]) {
 148                 tfargs.tf_flags |= IDE_TFLAG_IO_16BIT;
 149                 bufsize = SECTOR_SIZE * args[3];
 150                 buf = kzalloc(bufsize, GFP_KERNEL);
 151                 if (buf == NULL)
 152                         return -ENOMEM;
 153         }
 154
 155         if (tf->command == ATA_CMD_SET_FEATURES &&
 156             tf->feature == SETFEATURES_XFER &&
 157             tf->nsect >= XFER_SW_DMA_0 &&
 158             (id[ATA_ID_UDMA_MODES] ||
 159              id[ATA_ID_MWDMA_MODES] ||
 160              id[ATA_ID_SWDMA_MODES])) {
 161                 xfer_rate = args[1];
 162                 if (tf->nsect > XFER_UDMA_2 && !eighty_ninty_three(drive)) {
 163                         printk(KERN_WARNING "%s: UDMA speeds >UDMA33 cannot "
 164                                             "be set\n", drive->name);
 165                         goto abort;
 166                 }
 167         }
 168
 169         err = ide_raw_taskfile(drive, &tfargs, buf, args[3]);
 170
 171         args[0] = tf->status;
 172         args[1] = tf->error;
 173         args[2] = tf->nsect;
 174
 175         if (!err && xfer_rate) {
 176                 /* active-retuning-calls future */
 177                 ide_set_xfer_rate(drive, xfer_rate);
 178                 ide_driveid_update(drive);
 179         }
 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 cmd, unsigned long arg)
 192 {
 193         void __user *p = (void __user *)arg;
 194         int err = 0;
 195         u8 args[7];
 196         ide_task_t task;
 197
 198         if (copy_from_user(args, p, 7))
 199                 return -EFAULT;
 200
 201         memset(&task, 0, sizeof(task));
 202         memcpy(&task.tf_array[7], &args[1], 6);
 203         task.tf.command = args[0];
 204         task.tf_flags = IDE_TFLAG_TF | IDE_TFLAG_DEVICE;
 205
 206         err = ide_no_data_taskfile(drive, &task);
 207
 208         args[0] = task.tf.command;
 209         memcpy(&args[1], &task.tf_array[7], 6);
 210
 211         if (copy_to_user(p, args, 7))
 212                 err = -EFAULT;
 213
 214         return err;
 215 }
 216
 217 static int generic_drive_reset(ide_drive_t *drive)
 218 {
 219         struct request *rq;
 220         int ret = 0;
 221
 222         rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
 223         rq->cmd_type = REQ_TYPE_SPECIAL;
 224         rq->cmd_len = 1;
 225         rq->cmd[0] = REQ_DRIVE_RESET;
 226         rq->cmd_flags |= REQ_SOFTBARRIER;
 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 file *file,
 234                       struct block_device *bdev,
 235                       unsigned int cmd, unsigned long arg)
 236 {
 237         int err;
 238
 239         err = ide_setting_ioctl(drive, bdev, cmd, arg, ide_ioctl_settings);
 240         if (err != -EOPNOTSUPP)
 241                 return err;
 242
 243         switch (cmd) {
 244         case HDIO_OBSOLETE_IDENTITY:
 245         case HDIO_GET_IDENTITY:
 246                 if (bdev != bdev->bd_contains)
 247                         return -EINVAL;
 248                 return ide_get_identity_ioctl(drive, cmd, arg);
 249         case HDIO_GET_NICE:
 250                 return ide_get_nice_ioctl(drive, arg);
 251         case HDIO_SET_NICE:
 252                 if (!capable(CAP_SYS_ADMIN))
 253                         return -EACCES;
 254                 return ide_set_nice_ioctl(drive, arg);
 255 #ifdef CONFIG_IDE_TASK_IOCTL
 256         case HDIO_DRIVE_TASKFILE:
 257                 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
 258                         return -EACCES;
 259                 if (drive->media == ide_disk)
 260                         return ide_taskfile_ioctl(drive, cmd, arg);
 261                 return -ENOMSG;
 262 #endif
 263         case HDIO_DRIVE_CMD:
 264                 if (!capable(CAP_SYS_RAWIO))
 265                         return -EACCES;
 266                 return ide_cmd_ioctl(drive, cmd, arg);
 267         case HDIO_DRIVE_TASK:
 268                 if (!capable(CAP_SYS_RAWIO))
 269                         return -EACCES;
 270                 return ide_task_ioctl(drive, cmd, arg);
 271         case HDIO_DRIVE_RESET:
 272                 if (!capable(CAP_SYS_ADMIN))
 273                         return -EACCES;
 274                 return generic_drive_reset(drive);
 275         case HDIO_GET_BUSSTATE:
 276                 if (!capable(CAP_SYS_ADMIN))
 277                         return -EACCES;
 278                 if (put_user(BUSSTATE_ON, (long __user *)arg))
 279                         return -EFAULT;
 280                 return 0;
 281         case HDIO_SET_BUSSTATE:
 282                 if (!capable(CAP_SYS_ADMIN))
 283                         return -EACCES;
 284                 return -EOPNOTSUPP;
 285         default:
 286                 return -EINVAL;
 287         }
 288 }
 289 EXPORT_SYMBOL(generic_ide_ioctl);