drivers/ide/ide-ioctls.c

   1 /*
   2  * IDE ioctls handling.
   3  */
   4
   5 #include <linux/export.h>
   6 #include <linux/hdreg.h>
   7 #include <linux/ide.h>
   8 #include <linux/slab.h>
   9
  10 static const struct ide_ioctl_devset ide_ioctl_settings[] = {
  11 { HDIO_GET_32BIT,        HDIO_SET_32BIT,        &ide_devset_io_32bit  },
  12 { HDIO_GET_KEEPSETTINGS, HDIO_SET_KEEPSETTINGS, &ide_devset_keepsettings },
  13 { HDIO_GET_UNMASKINTR,   HDIO_SET_UNMASKINTR,   &ide_devset_unmaskirq },
  14 { HDIO_GET_DMA,          HDIO_SET_DMA,          &ide_devset_using_dma },
  15 { -1,                    HDIO_SET_PIO_MODE,     &ide_devset_pio_mode  },
  16 { 0 }
  17 };
  18
  19 int ide_setting_ioctl(ide_drive_t *drive, struct block_device *bdev,
  20                       unsigned int cmd, unsigned long arg,
  21                       const struct ide_ioctl_devset *s)
  22 {
  23         const struct ide_devset *ds;
  24         int err = -EOPNOTSUPP;
  25
  26         for (; (ds = s->setting); s++) {
  27                 if (ds->get && s->get_ioctl == cmd)
  28                         goto read_val;
  29                 else if (ds->set && s->set_ioctl == cmd)
  30                         goto set_val;
  31         }
  32
  33         return err;
  34
  35 read_val:
  36         mutex_lock(&ide_setting_mtx);
  37         err = ds->get(drive);
  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 = ide_devset_execute(drive, ds, 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->dev_flags & IDE_DFLAG_ID_READ) == 0) {
  65                 rc = -ENOMSG;
  66                 goto out;
  67         }
  68
  69         /* ata_id_to_hd_driveid() relies on 'id' to be fully allocated. */
  70         id = kmalloc(ATA_ID_WORDS * 2, 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_tape))
 102                 return -EPERM;
 103
 104         if ((arg >> IDE_NICE_DSC_OVERLAP) & 1)
 105                 drive->dev_flags |= IDE_DFLAG_DSC_OVERLAP;
 106         else
 107                 drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP;
 108
 109         if ((arg >> IDE_NICE_1) & 1)
 110                 drive->dev_flags |= IDE_DFLAG_NICE1;
 111         else
 112                 drive->dev_flags &= ~IDE_DFLAG_NICE1;
 113
 114         return 0;
 115 }
 116
 117 static int ide_cmd_ioctl(ide_drive_t *drive, unsigned long arg)
 118 {
 119         u8 *buf = NULL;
 120         int bufsize = 0, err = 0;
 121         u8 args[4], xfer_rate = 0;
 122         struct ide_cmd cmd;
 123         struct ide_taskfile *tf = &cmd.tf;
 124
 125         if (NULL == (void *) arg) {
 126                 struct request *rq;
 127
 128                 rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
 129                 rq->cmd_type = REQ_TYPE_ATA_TASKFILE;
 130                 err = blk_execute_rq(drive->queue, NULL, rq, 0);
 131                 blk_put_request(rq);
 132
 133                 return err;
 134         }
 135
 136         if (copy_from_user(args, (void __user *)arg, 4))
 137                 return -EFAULT;
 138
 139         memset(&cmd, 0, sizeof(cmd));
 140         tf->feature = args[2];
 141         if (args[0] == ATA_CMD_SMART) {
 142                 tf->nsect = args[3];
 143                 tf->lbal  = args[1];
 144                 tf->lbam  = 0x4f;
 145                 tf->lbah  = 0xc2;
 146                 cmd.valid.out.tf = IDE_VALID_OUT_TF;
 147                 cmd.valid.in.tf  = IDE_VALID_NSECT;
 148         } else {
 149                 tf->nsect = args[1];
 150                 cmd.valid.out.tf = IDE_VALID_FEATURE | IDE_VALID_NSECT;
 151                 cmd.valid.in.tf  = IDE_VALID_NSECT;
 152         }
 153         tf->command = args[0];
 154         cmd.protocol = args[3] ? ATA_PROT_PIO : ATA_PROT_NODATA;
 155
 156         if (args[3]) {
 157                 cmd.tf_flags |= IDE_TFLAG_IO_16BIT;
 158                 bufsize = SECTOR_SIZE * args[3];
 159                 buf = kzalloc(bufsize, GFP_KERNEL);
 160                 if (buf == NULL)
 161                         return -ENOMEM;
 162         }
 163
 164         if (tf->command == ATA_CMD_SET_FEATURES &&
 165             tf->feature == SETFEATURES_XFER &&
 166             tf->nsect >= XFER_SW_DMA_0) {
 167                 xfer_rate = ide_find_dma_mode(drive, tf->nsect);
 168                 if (xfer_rate != tf->nsect) {
 169                         err = -EINVAL;
 170                         goto abort;
 171                 }
 172
 173                 cmd.tf_flags |= IDE_TFLAG_SET_XFER;
 174         }
 175
 176         err = ide_raw_taskfile(drive, &cmd, buf, args[3]);
 177
 178         args[0] = tf->status;
 179         args[1] = tf->error;
 180         args[2] = tf->nsect;
 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 long arg)
 193 {
 194         void __user *p = (void __user *)arg;
 195         int err = 0;
 196         u8 args[7];
 197         struct ide_cmd cmd;
 198
 199         if (copy_from_user(args, p, 7))
 200                 return -EFAULT;
 201
 202         memset(&cmd, 0, sizeof(cmd));
 203         memcpy(&cmd.tf.feature, &args[1], 6);
 204         cmd.tf.command = args[0];
 205         cmd.valid.out.tf = IDE_VALID_OUT_TF | IDE_VALID_DEVICE;
 206         cmd.valid.in.tf  = IDE_VALID_IN_TF  | IDE_VALID_DEVICE;
 207
 208         err = ide_no_data_taskfile(drive, &cmd);
 209
 210         args[0] = cmd.tf.command;
 211         memcpy(&args[1], &cmd.tf.feature, 6);
 212
 213         if (copy_to_user(p, args, 7))
 214                 err = -EFAULT;
 215
 216         return err;
 217 }
 218
 219 static int generic_drive_reset(ide_drive_t *drive)
 220 {
 221         struct request *rq;
 222         int ret = 0;
 223
 224         rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
 225         rq->cmd_type = REQ_TYPE_SPECIAL;
 226         rq->cmd_len = 1;
 227         rq->cmd[0] = REQ_DRIVE_RESET;
 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 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, 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, arg);
 267         case HDIO_DRIVE_TASK:
 268                 if (!capable(CAP_SYS_RAWIO))
 269                         return -EACCES;
 270                 return ide_task_ioctl(drive, 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);