diff options
Diffstat (limited to 'drivers/ide/ide-ioctls.c')
| -rw-r--r-- | drivers/ide/ide-ioctls.c | 289 |
1 files changed, 289 insertions, 0 deletions
diff --git a/drivers/ide/ide-ioctls.c b/drivers/ide/ide-ioctls.c new file mode 100644 index 000000000..6233fa2cb --- /dev/null +++ b/drivers/ide/ide-ioctls.c @@ -0,0 +1,289 @@ +/* + * IDE ioctls handling. + */ + +#include <linux/export.h> +#include <linux/hdreg.h> +#include <linux/ide.h> +#include <linux/slab.h> + +static const struct ide_ioctl_devset ide_ioctl_settings[] = { +{ HDIO_GET_32BIT, HDIO_SET_32BIT, &ide_devset_io_32bit }, +{ HDIO_GET_KEEPSETTINGS, HDIO_SET_KEEPSETTINGS, &ide_devset_keepsettings }, +{ HDIO_GET_UNMASKINTR, HDIO_SET_UNMASKINTR, &ide_devset_unmaskirq }, +{ HDIO_GET_DMA, HDIO_SET_DMA, &ide_devset_using_dma }, +{ -1, HDIO_SET_PIO_MODE, &ide_devset_pio_mode }, +{ 0 } +}; + +int ide_setting_ioctl(ide_drive_t *drive, struct block_device *bdev, + unsigned int cmd, unsigned long arg, + const struct ide_ioctl_devset *s) +{ + const struct ide_devset *ds; + int err = -EOPNOTSUPP; + + for (; (ds = s->setting); s++) { + if (ds->get && s->get_ioctl == cmd) + goto read_val; + else if (ds->set && s->set_ioctl == cmd) + goto set_val; + } + + return err; + +read_val: + mutex_lock(&ide_setting_mtx); + err = ds->get(drive); + mutex_unlock(&ide_setting_mtx); + return err >= 0 ? put_user(err, (long __user *)arg) : err; + +set_val: + if (bdev != bdev->bd_contains) + err = -EINVAL; + else { + if (!capable(CAP_SYS_ADMIN)) + err = -EACCES; + else { + mutex_lock(&ide_setting_mtx); + err = ide_devset_execute(drive, ds, arg); + mutex_unlock(&ide_setting_mtx); + } + } + return err; +} +EXPORT_SYMBOL_GPL(ide_setting_ioctl); + +static int ide_get_identity_ioctl(ide_drive_t *drive, unsigned int cmd, + unsigned long arg) +{ + u16 *id = NULL; + int size = (cmd == HDIO_GET_IDENTITY) ? (ATA_ID_WORDS * 2) : 142; + int rc = 0; + + if ((drive->dev_flags & IDE_DFLAG_ID_READ) == 0) { + rc = -ENOMSG; + goto out; + } + + /* ata_id_to_hd_driveid() relies on 'id' to be fully allocated. */ + id = kmalloc(ATA_ID_WORDS * 2, GFP_KERNEL); + if (id == NULL) { + rc = -ENOMEM; + goto out; + } + + memcpy(id, drive->id, size); + ata_id_to_hd_driveid(id); + + if (copy_to_user((void __user *)arg, id, size)) + rc = -EFAULT; + + kfree(id); +out: + return rc; +} + +static int ide_get_nice_ioctl(ide_drive_t *drive, unsigned long arg) +{ + return put_user((!!(drive->dev_flags & IDE_DFLAG_DSC_OVERLAP) + << IDE_NICE_DSC_OVERLAP) | + (!!(drive->dev_flags & IDE_DFLAG_NICE1) + << IDE_NICE_1), (long __user *)arg); +} + +static int ide_set_nice_ioctl(ide_drive_t *drive, unsigned long arg) +{ + if (arg != (arg & ((1 << IDE_NICE_DSC_OVERLAP) | (1 << IDE_NICE_1)))) + return -EPERM; + + if (((arg >> IDE_NICE_DSC_OVERLAP) & 1) && + (drive->media != ide_tape)) + return -EPERM; + + if ((arg >> IDE_NICE_DSC_OVERLAP) & 1) + drive->dev_flags |= IDE_DFLAG_DSC_OVERLAP; + else + drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP; + + if ((arg >> IDE_NICE_1) & 1) + drive->dev_flags |= IDE_DFLAG_NICE1; + else + drive->dev_flags &= ~IDE_DFLAG_NICE1; + + return 0; +} + +static int ide_cmd_ioctl(ide_drive_t *drive, unsigned long arg) +{ + u8 *buf = NULL; + int bufsize = 0, err = 0; + u8 args[4], xfer_rate = 0; + struct ide_cmd cmd; + struct ide_taskfile *tf = &cmd.tf; + + if (NULL == (void *) arg) { + struct request *rq; + + rq = blk_get_request(drive->queue, READ, __GFP_WAIT); + rq->cmd_type = REQ_TYPE_ATA_TASKFILE; + err = blk_execute_rq(drive->queue, NULL, rq, 0); + blk_put_request(rq); + + return err; + } + + if (copy_from_user(args, (void __user *)arg, 4)) + return -EFAULT; + + memset(&cmd, 0, sizeof(cmd)); + tf->feature = args[2]; + if (args[0] == ATA_CMD_SMART) { + tf->nsect = args[3]; + tf->lbal = args[1]; + tf->lbam = ATA_SMART_LBAM_PASS; + tf->lbah = ATA_SMART_LBAH_PASS; + cmd.valid.out.tf = IDE_VALID_OUT_TF; + cmd.valid.in.tf = IDE_VALID_NSECT; + } else { + tf->nsect = args[1]; + cmd.valid.out.tf = IDE_VALID_FEATURE | IDE_VALID_NSECT; + cmd.valid.in.tf = IDE_VALID_NSECT; + } + tf->command = args[0]; + cmd.protocol = args[3] ? ATA_PROT_PIO : ATA_PROT_NODATA; + + if (args[3]) { + cmd.tf_flags |= IDE_TFLAG_IO_16BIT; + bufsize = SECTOR_SIZE * args[3]; + buf = kzalloc(bufsize, GFP_KERNEL); + if (buf == NULL) + return -ENOMEM; + } + + if (tf->command == ATA_CMD_SET_FEATURES && + tf->feature == SETFEATURES_XFER && + tf->nsect >= XFER_SW_DMA_0) { + xfer_rate = ide_find_dma_mode(drive, tf->nsect); + if (xfer_rate != tf->nsect) { + err = -EINVAL; + goto abort; + } + + cmd.tf_flags |= IDE_TFLAG_SET_XFER; + } + + err = ide_raw_taskfile(drive, &cmd, buf, args[3]); + + args[0] = tf->status; + args[1] = tf->error; + args[2] = tf->nsect; +abort: + if (copy_to_user((void __user *)arg, &args, 4)) + err = -EFAULT; + if (buf) { + if (copy_to_user((void __user *)(arg + 4), buf, bufsize)) + err = -EFAULT; + kfree(buf); + } + return err; +} + +static int ide_task_ioctl(ide_drive_t *drive, unsigned long arg) +{ + void __user *p = (void __user *)arg; + int err = 0; + u8 args[7]; + struct ide_cmd cmd; + + if (copy_from_user(args, p, 7)) + return -EFAULT; + + memset(&cmd, 0, sizeof(cmd)); + memcpy(&cmd.tf.feature, &args[1], 6); + cmd.tf.command = args[0]; + cmd.valid.out.tf = IDE_VALID_OUT_TF | IDE_VALID_DEVICE; + cmd.valid.in.tf = IDE_VALID_IN_TF | IDE_VALID_DEVICE; + + err = ide_no_data_taskfile(drive, &cmd); + + args[0] = cmd.tf.command; + memcpy(&args[1], &cmd.tf.feature, 6); + + if (copy_to_user(p, args, 7)) + err = -EFAULT; + + return err; +} + +static int generic_drive_reset(ide_drive_t *drive) +{ + struct request *rq; + int ret = 0; + + rq = blk_get_request(drive->queue, READ, __GFP_WAIT); + rq->cmd_type = REQ_TYPE_SPECIAL; + rq->cmd_len = 1; + rq->cmd[0] = REQ_DRIVE_RESET; + if (blk_execute_rq(drive->queue, NULL, rq, 1)) + ret = rq->errors; + blk_put_request(rq); + return ret; +} + +int generic_ide_ioctl(ide_drive_t *drive, struct block_device *bdev, + unsigned int cmd, unsigned long arg) +{ + int err; + + err = ide_setting_ioctl(drive, bdev, cmd, arg, ide_ioctl_settings); + if (err != -EOPNOTSUPP) + return err; + + switch (cmd) { + case HDIO_OBSOLETE_IDENTITY: + case HDIO_GET_IDENTITY: + if (bdev != bdev->bd_contains) + return -EINVAL; + return ide_get_identity_ioctl(drive, cmd, arg); + case HDIO_GET_NICE: + return ide_get_nice_ioctl(drive, arg); + case HDIO_SET_NICE: + if (!capable(CAP_SYS_ADMIN)) + return -EACCES; + return ide_set_nice_ioctl(drive, arg); +#ifdef CONFIG_IDE_TASK_IOCTL + case HDIO_DRIVE_TASKFILE: + if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) + return -EACCES; + if (drive->media == ide_disk) + return ide_taskfile_ioctl(drive, arg); + return -ENOMSG; +#endif + case HDIO_DRIVE_CMD: + if (!capable(CAP_SYS_RAWIO)) + return -EACCES; + return ide_cmd_ioctl(drive, arg); + case HDIO_DRIVE_TASK: + if (!capable(CAP_SYS_RAWIO)) + return -EACCES; + return ide_task_ioctl(drive, arg); + case HDIO_DRIVE_RESET: + if (!capable(CAP_SYS_ADMIN)) + return -EACCES; + return generic_drive_reset(drive); + case HDIO_GET_BUSSTATE: + if (!capable(CAP_SYS_ADMIN)) + return -EACCES; + if (put_user(BUSSTATE_ON, (long __user *)arg)) + return -EFAULT; + return 0; + case HDIO_SET_BUSSTATE: + if (!capable(CAP_SYS_ADMIN)) + return -EACCES; + return -EOPNOTSUPP; + default: + return -EINVAL; + } +} +EXPORT_SYMBOL(generic_ide_ioctl); |