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