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