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->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->dsc_overlap << IDE_NICE_DSC_OVERLAP) |
  90                         (drive->nice1 << IDE_NICE_1), (long __user *)arg);
  91 }
  92
  93 static int ide_set_nice_ioctl(ide_drive_t *drive, unsigned long arg)
  94 {
  95         if (arg != (arg & ((1 << IDE_NICE_DSC_OVERLAP) | (1 << IDE_NICE_1))))
  96                 return -EPERM;
  97
  98         if (((arg >> IDE_NICE_DSC_OVERLAP) & 1) &&
  99             (drive->media == ide_disk || drive->media == ide_floppy ||
 100              drive->scsi))
 101                 return -EPERM;
 102
 103         drive->dsc_overlap = (arg >> IDE_NICE_DSC_OVERLAP) & 1;
 104         drive->nice1 = (arg >> IDE_NICE_1) & 1;
 105
 106         return 0;
 107 }
 108
 109 static int ide_cmd_ioctl(ide_drive_t *drive, unsigned cmd, unsigned long arg)
 110 {
 111         u8 *buf = NULL;
 112         int bufsize = 0, err = 0;
 113         u8 args[4], xfer_rate = 0;
 114         ide_task_t tfargs;
 115         struct ide_taskfile *tf = &tfargs.tf;
 116         u16 *id = drive->id;
 117
 118         if (NULL == (void *) arg) {
 119                 struct request *rq;
 120
 121                 rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
 122                 rq->cmd_type = REQ_TYPE_ATA_TASKFILE;
 123                 err = blk_execute_rq(drive->queue, NULL, rq, 0);
 124                 blk_put_request(rq);
 125
 126                 return err;
 127         }
 128
 129         if (copy_from_user(args, (void __user *)arg, 4))
 130                 return -EFAULT;
 131
 132         memset(&tfargs, 0, sizeof(ide_task_t));
 133         tf->feature = args[2];
 134         if (args[0] == ATA_CMD_SMART) {
 135                 tf->nsect = args[3];
 136                 tf->lbal  = args[1];
 137                 tf->lbam  = 0x4f;
 138                 tf->lbah  = 0xc2;
 139                 tfargs.tf_flags = IDE_TFLAG_OUT_TF | IDE_TFLAG_IN_NSECT;
 140         } else {
 141                 tf->nsect = args[1];
 142                 tfargs.tf_flags = IDE_TFLAG_OUT_FEATURE |
 143                                   IDE_TFLAG_OUT_NSECT | IDE_TFLAG_IN_NSECT;
 144         }
 145         tf->command = args[0];
 146         tfargs.data_phase = args[3] ? TASKFILE_IN : TASKFILE_NO_DATA;
 147
 148         if (args[3]) {
 149                 tfargs.tf_flags |= IDE_TFLAG_IO_16BIT;
 150                 bufsize = SECTOR_SIZE * args[3];
 151                 buf = kzalloc(bufsize, GFP_KERNEL);
 152                 if (buf == NULL)
 153                         return -ENOMEM;
 154         }
 155
 156         if (tf->command == ATA_CMD_SET_FEATURES &&
 157             tf->feature == SETFEATURES_XFER &&
 158             tf->nsect >= XFER_SW_DMA_0 &&
 159             (id[ATA_ID_UDMA_MODES] ||
 160              id[ATA_ID_MWDMA_MODES] ||
 161              id[ATA_ID_SWDMA_MODES])) {
 162                 xfer_rate = args[1];
 163                 if (tf->nsect > XFER_UDMA_2 && !eighty_ninty_three(drive)) {
 164                         printk(KERN_WARNING "%s: UDMA speeds >UDMA33 cannot "
 165                                             "be set\n", drive->name);
 166                         goto abort;
 167                 }
 168         }
 169
 170         err = ide_raw_taskfile(drive, &tfargs, buf, args[3]);
 171
 172         args[0] = tf->status;
 173         args[1] = tf->error;
 174         args[2] = tf->nsect;
 175
 176         if (!err && xfer_rate) {
 177                 /* active-retuning-calls future */
 178                 ide_set_xfer_rate(drive, xfer_rate);
 179                 ide_driveid_update(drive);
 180         }
 181 abort:
 182         if (copy_to_user((void __user *)arg, &args, 4))
 183                 err = -EFAULT;
 184         if (buf) {
 185                 if (copy_to_user((void __user *)(arg + 4), buf, bufsize))
 186                         err = -EFAULT;
 187                 kfree(buf);
 188         }
 189         return err;
 190 }
 191
 192 static int ide_task_ioctl(ide_drive_t *drive, unsigned cmd, unsigned long arg)
 193 {
 194         void __user *p = (void __user *)arg;
 195         int err = 0;
 196         u8 args[7];
 197         ide_task_t task;
 198
 199         if (copy_from_user(args, p, 7))
 200                 return -EFAULT;
 201
 202         memset(&task, 0, sizeof(task));
 203         memcpy(&task.tf_array[7], &args[1], 6);
 204         task.tf.command = args[0];
 205         task.tf_flags = IDE_TFLAG_TF | IDE_TFLAG_DEVICE;
 206
 207         err = ide_no_data_taskfile(drive, &task);
 208
 209         args[0] = task.tf.command;
 210         memcpy(&args[1], &task.tf_array[7], 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         rq->cmd_flags |= REQ_SOFTBARRIER;
 228         if (blk_execute_rq(drive->queue, NULL, rq, 1))
 229                 ret = rq->errors;
 230         blk_put_request(rq);
 231         return ret;
 232 }
 233
 234 int generic_ide_ioctl(ide_drive_t *drive, struct file *file,
 235                       struct block_device *bdev,
 236                       unsigned int cmd, unsigned long arg)
 237 {
 238         int err;
 239
 240         err = ide_setting_ioctl(drive, bdev, cmd, arg, ide_ioctl_settings);
 241         if (err != -EOPNOTSUPP)
 242                 return err;
 243
 244         switch (cmd) {
 245         case HDIO_OBSOLETE_IDENTITY:
 246         case HDIO_GET_IDENTITY:
 247                 if (bdev != bdev->bd_contains)
 248                         return -EINVAL;
 249                 return ide_get_identity_ioctl(drive, cmd, arg);
 250         case HDIO_GET_NICE:
 251                 return ide_get_nice_ioctl(drive, arg);
 252         case HDIO_SET_NICE:
 253                 if (!capable(CAP_SYS_ADMIN))
 254                         return -EACCES;
 255                 return ide_set_nice_ioctl(drive, arg);
 256 #ifdef CONFIG_IDE_TASK_IOCTL
 257         case HDIO_DRIVE_TASKFILE:
 258                 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
 259                         return -EACCES;
 260                 if (drive->media == ide_disk)
 261                         return ide_taskfile_ioctl(drive, cmd, arg);
 262                 return -ENOMSG;
 263 #endif
 264         case HDIO_DRIVE_CMD:
 265                 if (!capable(CAP_SYS_RAWIO))
 266                         return -EACCES;
 267                 return ide_cmd_ioctl(drive, cmd, arg);
 268         case HDIO_DRIVE_TASK:
 269                 if (!capable(CAP_SYS_RAWIO))
 270                         return -EACCES;
 271                 return ide_task_ioctl(drive, cmd, arg);
 272         case HDIO_DRIVE_RESET:
 273                 if (!capable(CAP_SYS_ADMIN))
 274                         return -EACCES;
 275                 return generic_drive_reset(drive);
 276         case HDIO_GET_BUSSTATE:
 277                 if (!capable(CAP_SYS_ADMIN))
 278                         return -EACCES;
 279                 if (put_user(BUSSTATE_ON, (long __user *)arg))
 280                         return -EFAULT;
 281                 return 0;
 282         case HDIO_SET_BUSSTATE:
 283                 if (!capable(CAP_SYS_ADMIN))
 284                         return -EACCES;
 285                 return -EOPNOTSUPP;
 286         default:
 287                 return -EINVAL;
 288         }
 289 }
 290 EXPORT_SYMBOL(generic_ide_ioctl);