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,        &ide_devset_io_32bit  },
  10 { HDIO_GET_KEEPSETTINGS, HDIO_SET_KEEPSETTINGS, &ide_devset_keepsettings },
  11 { HDIO_GET_UNMASKINTR,   HDIO_SET_UNMASKINTR,   &ide_devset_unmaskirq },
  12 { HDIO_GET_DMA,          HDIO_SET_DMA,          &ide_devset_using_dma },
  13 { -1,                    HDIO_SET_PIO_MODE,     &ide_devset_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         const struct ide_devset *ds;
  22         unsigned long flags;
  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         spin_lock_irqsave(&ide_lock, flags);
  37         err = ds->get(drive);
  38         spin_unlock_irqrestore(&ide_lock, flags);
  39         mutex_unlock(&ide_setting_mtx);
  40         return err >= 0 ? put_user(err, (long __user *)arg) : err;
  41
  42 set_val:
  43         if (bdev != bdev->bd_contains)
  44                 err = -EINVAL;
  45         else {
  46                 if (!capable(CAP_SYS_ADMIN))
  47                         err = -EACCES;
  48                 else {
  49                         mutex_lock(&ide_setting_mtx);
  50                         err = ide_devset_execute(drive, ds, arg);
  51                         mutex_unlock(&ide_setting_mtx);
  52                 }
  53         }
  54         return err;
  55 }
  56 EXPORT_SYMBOL_GPL(ide_setting_ioctl);
  57
  58 static int ide_get_identity_ioctl(ide_drive_t *drive, unsigned int cmd,
  59                                   unsigned long arg)
  60 {
  61         u16 *id = NULL;
  62         int size = (cmd == HDIO_GET_IDENTITY) ? (ATA_ID_WORDS * 2) : 142;
  63         int rc = 0;
  64
  65         if ((drive->dev_flags & IDE_DFLAG_ID_READ) == 0) {
  66                 rc = -ENOMSG;
  67                 goto out;
  68         }
  69
  70         id = kmalloc(size, GFP_KERNEL);
  71         if (id == NULL) {
  72                 rc = -ENOMEM;
  73                 goto out;
  74         }
  75
  76         memcpy(id, drive->id, size);
  77         ata_id_to_hd_driveid(id);
  78
  79         if (copy_to_user((void __user *)arg, id, size))
  80                 rc = -EFAULT;
  81
  82         kfree(id);
  83 out:
  84         return rc;
  85 }
  86
  87 static int ide_get_nice_ioctl(ide_drive_t *drive, unsigned long arg)
  88 {
  89         return put_user((!!(drive->dev_flags & IDE_DFLAG_DSC_OVERLAP)
  90                          << IDE_NICE_DSC_OVERLAP) |
  91                         (!!(drive->dev_flags & IDE_DFLAG_NICE1)
  92                          << IDE_NICE_1), (long __user *)arg);
  93 }
  94
  95 static int ide_set_nice_ioctl(ide_drive_t *drive, unsigned long arg)
  96 {
  97         if (arg != (arg & ((1 << IDE_NICE_DSC_OVERLAP) | (1 << IDE_NICE_1))))
  98                 return -EPERM;
  99
 100         if (((arg >> IDE_NICE_DSC_OVERLAP) & 1) &&
 101             (drive->media == ide_disk || drive->media == ide_floppy ||
 102              (drive->dev_flags & IDE_DFLAG_SCSI)))
 103                 return -EPERM;
 104
 105         if ((arg >> IDE_NICE_DSC_OVERLAP) & 1)
 106                 drive->dev_flags |= IDE_DFLAG_DSC_OVERLAP;
 107         else
 108                 drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP;
 109
 110         if ((arg >> IDE_NICE_1) & 1)
 111                 drive->dev_flags |= IDE_DFLAG_NICE1;
 112         else
 113                 drive->dev_flags &= ~IDE_DFLAG_NICE1;
 114
 115         return 0;
 116 }
 117
 118 static int ide_cmd_ioctl(ide_drive_t *drive, unsigned cmd, unsigned long arg)
 119 {
 120         u8 *buf = NULL;
 121         int bufsize = 0, err = 0;
 122         u8 args[4], xfer_rate = 0;
 123         ide_task_t tfargs;
 124         struct ide_taskfile *tf = &tfargs.tf;
 125         u16 *id = drive->id;
 126
 127         if (NULL == (void *) arg) {
 128                 struct request *rq;
 129
 130                 rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
 131                 rq->cmd_type = REQ_TYPE_ATA_TASKFILE;
 132                 err = blk_execute_rq(drive->queue, NULL, rq, 0);
 133                 blk_put_request(rq);
 134
 135                 return err;
 136         }
 137
 138         if (copy_from_user(args, (void __user *)arg, 4))
 139                 return -EFAULT;
 140
 141         memset(&tfargs, 0, sizeof(ide_task_t));
 142         tf->feature = args[2];
 143         if (args[0] == ATA_CMD_SMART) {
 144                 tf->nsect = args[3];
 145                 tf->lbal  = args[1];
 146                 tf->lbam  = 0x4f;
 147                 tf->lbah  = 0xc2;
 148                 tfargs.tf_flags = IDE_TFLAG_OUT_TF | IDE_TFLAG_IN_NSECT;
 149         } else {
 150                 tf->nsect = args[1];
 151                 tfargs.tf_flags = IDE_TFLAG_OUT_FEATURE |
 152                                   IDE_TFLAG_OUT_NSECT | IDE_TFLAG_IN_NSECT;
 153         }
 154         tf->command = args[0];
 155         tfargs.data_phase = args[3] ? TASKFILE_IN : TASKFILE_NO_DATA;
 156
 157         if (args[3]) {
 158                 tfargs.tf_flags |= IDE_TFLAG_IO_16BIT;
 159                 bufsize = SECTOR_SIZE * args[3];
 160                 buf = kzalloc(bufsize, GFP_KERNEL);
 161                 if (buf == NULL)
 162                         return -ENOMEM;
 163         }
 164
 165         if (tf->command == ATA_CMD_SET_FEATURES &&
 166             tf->feature == SETFEATURES_XFER &&
 167             tf->nsect >= XFER_SW_DMA_0 &&
 168             (id[ATA_ID_UDMA_MODES] ||
 169              id[ATA_ID_MWDMA_MODES] ||
 170              id[ATA_ID_SWDMA_MODES])) {
 171                 xfer_rate = args[1];
 172                 if (tf->nsect > XFER_UDMA_2 && !eighty_ninty_three(drive)) {
 173                         printk(KERN_WARNING "%s: UDMA speeds >UDMA33 cannot "
 174                                             "be set\n", drive->name);
 175                         goto abort;
 176                 }
 177         }
 178
 179         err = ide_raw_taskfile(drive, &tfargs, buf, args[3]);
 180
 181         args[0] = tf->status;
 182         args[1] = tf->error;
 183         args[2] = tf->nsect;
 184
 185         if (!err && xfer_rate) {
 186                 /* active-retuning-calls future */
 187                 ide_set_xfer_rate(drive, xfer_rate);
 188                 ide_driveid_update(drive);
 189         }
 190 abort:
 191         if (copy_to_user((void __user *)arg, &args, 4))
 192                 err = -EFAULT;
 193         if (buf) {
 194                 if (copy_to_user((void __user *)(arg + 4), buf, bufsize))
 195                         err = -EFAULT;
 196                 kfree(buf);
 197         }
 198         return err;
 199 }
 200
 201 static int ide_task_ioctl(ide_drive_t *drive, unsigned cmd, unsigned long arg)
 202 {
 203         void __user *p = (void __user *)arg;
 204         int err = 0;
 205         u8 args[7];
 206         ide_task_t task;
 207
 208         if (copy_from_user(args, p, 7))
 209                 return -EFAULT;
 210
 211         memset(&task, 0, sizeof(task));
 212         memcpy(&task.tf_array[7], &args[1], 6);
 213         task.tf.command = args[0];
 214         task.tf_flags = IDE_TFLAG_TF | IDE_TFLAG_DEVICE;
 215
 216         err = ide_no_data_taskfile(drive, &task);
 217
 218         args[0] = task.tf.command;
 219         memcpy(&args[1], &task.tf_array[7], 6);
 220
 221         if (copy_to_user(p, args, 7))
 222                 err = -EFAULT;
 223
 224         return err;
 225 }
 226
 227 static int generic_drive_reset(ide_drive_t *drive)
 228 {
 229         struct request *rq;
 230         int ret = 0;
 231
 232         rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
 233         rq->cmd_type = REQ_TYPE_SPECIAL;
 234         rq->cmd_len = 1;
 235         rq->cmd[0] = REQ_DRIVE_RESET;
 236         rq->cmd_flags |= REQ_SOFTBARRIER;
 237         if (blk_execute_rq(drive->queue, NULL, rq, 1))
 238                 ret = rq->errors;
 239         blk_put_request(rq);
 240         return ret;
 241 }
 242
 243 int generic_ide_ioctl(ide_drive_t *drive, struct file *file,
 244                       struct block_device *bdev,
 245                       unsigned int cmd, unsigned long arg)
 246 {
 247         int err;
 248
 249         err = ide_setting_ioctl(drive, bdev, cmd, arg, ide_ioctl_settings);
 250         if (err != -EOPNOTSUPP)
 251                 return err;
 252
 253         switch (cmd) {
 254         case HDIO_OBSOLETE_IDENTITY:
 255         case HDIO_GET_IDENTITY:
 256                 if (bdev != bdev->bd_contains)
 257                         return -EINVAL;
 258                 return ide_get_identity_ioctl(drive, cmd, arg);
 259         case HDIO_GET_NICE:
 260                 return ide_get_nice_ioctl(drive, arg);
 261         case HDIO_SET_NICE:
 262                 if (!capable(CAP_SYS_ADMIN))
 263                         return -EACCES;
 264                 return ide_set_nice_ioctl(drive, arg);
 265 #ifdef CONFIG_IDE_TASK_IOCTL
 266         case HDIO_DRIVE_TASKFILE:
 267                 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
 268                         return -EACCES;
 269                 if (drive->media == ide_disk)
 270                         return ide_taskfile_ioctl(drive, cmd, arg);
 271                 return -ENOMSG;
 272 #endif
 273         case HDIO_DRIVE_CMD:
 274                 if (!capable(CAP_SYS_RAWIO))
 275                         return -EACCES;
 276                 return ide_cmd_ioctl(drive, cmd, arg);
 277         case HDIO_DRIVE_TASK:
 278                 if (!capable(CAP_SYS_RAWIO))
 279                         return -EACCES;
 280                 return ide_task_ioctl(drive, cmd, arg);
 281         case HDIO_DRIVE_RESET:
 282                 if (!capable(CAP_SYS_ADMIN))
 283                         return -EACCES;
 284                 return generic_drive_reset(drive);
 285         case HDIO_GET_BUSSTATE:
 286                 if (!capable(CAP_SYS_ADMIN))
 287                         return -EACCES;
 288                 if (put_user(BUSSTATE_ON, (long __user *)arg))
 289                         return -EFAULT;
 290                 return 0;
 291         case HDIO_SET_BUSSTATE:
 292                 if (!capable(CAP_SYS_ADMIN))
 293                         return -EACCES;
 294                 return -EOPNOTSUPP;
 295         default:
 296                 return -EINVAL;
 297         }
 298 }
 299 EXPORT_SYMBOL(generic_ide_ioctl);