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306 lines
7.1 KiB
306 lines
7.1 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* IDE ioctls handling. |
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*/ |
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#include <linux/compat.h> |
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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 int put_user_long(long val, unsigned long arg) |
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{ |
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if (in_compat_syscall()) |
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return put_user(val, (compat_long_t __user *)compat_ptr(arg)); |
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return put_user(val, (long __user *)arg); |
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} |
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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_long(err, arg) : err; |
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set_val: |
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if (bdev_is_partition(bdev)) |
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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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void __user *argp) |
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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(argp, 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_long((!!(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), 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, void __user *argp) |
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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 == argp) { |
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struct request *rq; |
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rq = blk_get_request(drive->queue, REQ_OP_DRV_IN, 0); |
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ide_req(rq)->type = ATA_PRIV_TASKFILE; |
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blk_execute_rq(drive->queue, NULL, rq, 0); |
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err = scsi_req(rq)->result ? -EIO : 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, argp, 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(argp, &args, 4)) |
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err = -EFAULT; |
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if (buf) { |
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if (copy_to_user((argp + 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, void __user *p) |
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{ |
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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, REQ_OP_DRV_IN, 0); |
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ide_req(rq)->type = ATA_PRIV_MISC; |
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scsi_req(rq)->cmd_len = 1; |
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scsi_req(rq)->cmd[0] = REQ_DRIVE_RESET; |
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blk_execute_rq(drive->queue, NULL, rq, 1); |
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ret = scsi_req(rq)->result; |
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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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void __user *argp = (void __user *)arg; |
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if (in_compat_syscall()) |
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argp = compat_ptr(arg); |
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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_is_partition(bdev)) |
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return -EINVAL; |
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return ide_get_identity_ioctl(drive, cmd, argp); |
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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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/* missing compat handler for HDIO_DRIVE_TASKFILE */ |
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if (in_compat_syscall()) |
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return -ENOTTY; |
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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, argp); |
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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, argp); |
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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_long(BUSSTATE_ON, 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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