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, REQ_OP_DRV_IN, __GFP_RECLAIM);
 129                 ide_req(rq)->type = ATA_PRIV_TASKFILE;
 130                 blk_execute_rq(drive->queue, NULL, rq, 0);
 131                 err = scsi_req(rq)->result ? -EIO : 0;
 132                 blk_put_request(rq);
 133
 134                 return err;
 135         }
 136
 137         if (copy_from_user(args, (void __user *)arg, 4))
 138                 return -EFAULT;
 139
 140         memset(&cmd, 0, sizeof(cmd));
 141         tf->feature = args[2];
 142         if (args[0] == ATA_CMD_SMART) {
 143                 tf->nsect = args[3];
 144                 tf->lbal  = args[1];
 145                 tf->lbam  = ATA_SMART_LBAM_PASS;
 146                 tf->lbah  = ATA_SMART_LBAH_PASS;
 147                 cmd.valid.out.tf = IDE_VALID_OUT_TF;
 148                 cmd.valid.in.tf  = IDE_VALID_NSECT;
 149         } else {
 150                 tf->nsect = args[1];
 151                 cmd.valid.out.tf = IDE_VALID_FEATURE | IDE_VALID_NSECT;
 152                 cmd.valid.in.tf  = IDE_VALID_NSECT;
 153         }
 154         tf->command = args[0];
 155         cmd.protocol = args[3] ? ATA_PROT_PIO : ATA_PROT_NODATA;
 156
 157         if (args[3]) {
 158                 cmd.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                 xfer_rate = ide_find_dma_mode(drive, tf->nsect);
 169                 if (xfer_rate != tf->nsect) {
 170                         err = -EINVAL;
 171                         goto abort;
 172                 }
 173
 174                 cmd.tf_flags |= IDE_TFLAG_SET_XFER;
 175         }
 176
 177         err = ide_raw_taskfile(drive, &cmd, buf, args[3]);
 178
 179         args[0] = tf->status;
 180         args[1] = tf->error;
 181         args[2] = tf->nsect;
 182 abort:
 183         if (copy_to_user((void __user *)arg, &args, 4))
 184                 err = -EFAULT;
 185         if (buf) {
 186                 if (copy_to_user((void __user *)(arg + 4), buf, bufsize))
 187                         err = -EFAULT;
 188                 kfree(buf);
 189         }
 190         return err;
 191 }
 192
 193 static int ide_task_ioctl(ide_drive_t *drive, unsigned long arg)
 194 {
 195         void __user *p = (void __user *)arg;
 196         int err = 0;
 197         u8 args[7];
 198         struct ide_cmd cmd;
 199
 200         if (copy_from_user(args, p, 7))
 201                 return -EFAULT;
 202
 203         memset(&cmd, 0, sizeof(cmd));
 204         memcpy(&cmd.tf.feature, &args[1], 6);
 205         cmd.tf.command = args[0];
 206         cmd.valid.out.tf = IDE_VALID_OUT_TF | IDE_VALID_DEVICE;
 207         cmd.valid.in.tf  = IDE_VALID_IN_TF  | IDE_VALID_DEVICE;
 208
 209         err = ide_no_data_taskfile(drive, &cmd);
 210
 211         args[0] = cmd.tf.command;
 212         memcpy(&args[1], &cmd.tf.feature, 6);
 213
 214         if (copy_to_user(p, args, 7))
 215                 err = -EFAULT;
 216
 217         return err;
 218 }
 219
 220 static int generic_drive_reset(ide_drive_t *drive)
 221 {
 222         struct request *rq;
 223         int ret = 0;
 224
 225         rq = blk_get_request(drive->queue, REQ_OP_DRV_IN, __GFP_RECLAIM);
 226         ide_req(rq)->type = ATA_PRIV_MISC;
 227         scsi_req(rq)->cmd_len = 1;
 228         scsi_req(rq)->cmd[0] = REQ_DRIVE_RESET;
 229         blk_execute_rq(drive->queue, NULL, rq, 1);
 230         ret = scsi_req(rq)->result;
 231         blk_put_request(rq);
 232         return ret;
 233 }
 234
 235 int generic_ide_ioctl(ide_drive_t *drive, 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, 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, arg);
 268         case HDIO_DRIVE_TASK:
 269                 if (!capable(CAP_SYS_RAWIO))
 270                         return -EACCES;
 271                 return ide_task_ioctl(drive, 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);