[linux-2.6-block.git] / drivers / ide / ide-ioctls.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * 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, REQ_OP_DRV_IN, 0);
		ide_req(rq)->type = ATA_PRIV_TASKFILE;
		blk_execute_rq(drive->queue, NULL, rq, 0);
		err = scsi_req(rq)->result ? -EIO : 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, REQ_OP_DRV_IN, 0);
	ide_req(rq)->type = ATA_PRIV_MISC;
	scsi_req(rq)->cmd_len = 1;
	scsi_req(rq)->cmd[0] = REQ_DRIVE_RESET;
	blk_execute_rq(drive->queue, NULL, rq, 1);
	ret = scsi_req(rq)->result;
	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);
Commit	Line	Data
457c8996	1	// SPDX-License-Identifier: GPL-2.0-only
05236ea6 BZ	2	/*
	3	* IDE ioctls handling.
	4	*/
	5
38789fda	6	#include <linux/export.h>
05236ea6 BZ	7	#include <linux/hdreg.h>
05236ea6 BZ	8	#include <linux/ide.h>
5a0e3ad6	9	#include <linux/slab.h>
05236ea6 BZ	10
05236ea6 BZ	11	static const struct ide_ioctl_devset ide_ioctl_settings[] = {
92f1f8fd EO	12	{ HDIO_GET_32BIT, HDIO_SET_32BIT, &ide_devset_io_32bit },
	13	{ HDIO_GET_KEEPSETTINGS, HDIO_SET_KEEPSETTINGS, &ide_devset_keepsettings },
	14	{ HDIO_GET_UNMASKINTR, HDIO_SET_UNMASKINTR, &ide_devset_unmaskirq },
	15	{ HDIO_GET_DMA, HDIO_SET_DMA, &ide_devset_using_dma },
	16	{ -1, HDIO_SET_PIO_MODE, &ide_devset_pio_mode },
05236ea6 BZ	17	{ 0 }
	18	};
	19
	20	int ide_setting_ioctl(ide_drive_t drive, struct block_device bdev,
	21	unsigned int cmd, unsigned long arg,
	22	const struct ide_ioctl_devset *s)
	23	{
92f1f8fd	24	const struct ide_devset *ds;
05236ea6 BZ	25	int err = -EOPNOTSUPP;
05236ea6 BZ	26
92f1f8fd EO	27	for (; (ds = s->setting); s++) {
92f1f8fd EO	28	if (ds->get && s->get_ioctl == cmd)
05236ea6	29	goto read_val;
92f1f8fd	30	else if (ds->set && s->set_ioctl == cmd)
05236ea6 BZ	31	goto set_val;
	32	}
	33
	34	return err;
	35
	36	read_val:
	37	mutex_lock(&ide_setting_mtx);
92f1f8fd	38	err = ds->get(drive);
05236ea6 BZ	39	mutex_unlock(&ide_setting_mtx);
	40	return err >= 0 ? put_user(err, (long __user *)arg) : err;
	41
	42	set_val:
	43	if (bdev != bdev->bd_contains)
	44	err = -EINVAL;
	45	else {
	46	if (!capable(CAP_SYS_ADMIN))
	47	err = -EACCES;
	48	else {
	49	mutex_lock(&ide_setting_mtx);
92f1f8fd	50	err = ide_devset_execute(drive, ds, arg);
05236ea6 BZ	51	mutex_unlock(&ide_setting_mtx);
	52	}
	53	}
	54	return err;
	55	}
	56	EXPORT_SYMBOL_GPL(ide_setting_ioctl);
	57
	58	static int ide_get_identity_ioctl(ide_drive_t *drive, unsigned int cmd,
	59	unsigned long arg)
	60	{
	61	u16 *id = NULL;
	62	int size = (cmd == HDIO_GET_IDENTITY) ? (ATA_ID_WORDS * 2) : 142;
	63	int rc = 0;
	64
97100fc8	65	if ((drive->dev_flags & IDE_DFLAG_ID_READ) == 0) {
05236ea6 BZ	66	rc = -ENOMSG;
	67	goto out;
	68	}
	69
e18ed145 CE	70	/* ata_id_to_hd_driveid() relies on 'id' to be fully allocated. */
e18ed145 CE	71	id = kmalloc(ATA_ID_WORDS * 2, GFP_KERNEL);
05236ea6 BZ	72	if (id == NULL) {
	73	rc = -ENOMEM;
	74	goto out;
	75	}
	76
	77	memcpy(id, drive->id, size);
	78	ata_id_to_hd_driveid(id);
	79
	80	if (copy_to_user((void __user *)arg, id, size))
	81	rc = -EFAULT;
	82
	83	kfree(id);
	84	out:
	85	return rc;
	86	}
	87
	88	static int ide_get_nice_ioctl(ide_drive_t *drive, unsigned long arg)
	89	{
97100fc8 BZ	90	return put_user((!!(drive->dev_flags & IDE_DFLAG_DSC_OVERLAP)
	91	<< IDE_NICE_DSC_OVERLAP) \|
	92	(!!(drive->dev_flags & IDE_DFLAG_NICE1)
	93	<< IDE_NICE_1), (long __user *)arg);
05236ea6 BZ	94	}
	95
	96	static int ide_set_nice_ioctl(ide_drive_t *drive, unsigned long arg)
	97	{
	98	if (arg != (arg & ((1 << IDE_NICE_DSC_OVERLAP) \| (1 << IDE_NICE_1))))
	99	return -EPERM;
	100
	101	if (((arg >> IDE_NICE_DSC_OVERLAP) & 1) &&
5317464d	102	(drive->media != ide_tape))
05236ea6 BZ	103	return -EPERM;
05236ea6 BZ	104
97100fc8 BZ	105	if ((arg >> IDE_NICE_DSC_OVERLAP) & 1)
	106	drive->dev_flags \|= IDE_DFLAG_DSC_OVERLAP;
	107	else
	108	drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP;
	109
	110	if ((arg >> IDE_NICE_1) & 1)
	111	drive->dev_flags \|= IDE_DFLAG_NICE1;
	112	else
	113	drive->dev_flags &= ~IDE_DFLAG_NICE1;
05236ea6 BZ	114
	115	return 0;
	116	}
	117
22aa4b32	118	static int ide_cmd_ioctl(ide_drive_t *drive, unsigned long arg)
05236ea6 BZ	119	{
	120	u8 *buf = NULL;
	121	int bufsize = 0, err = 0;
	122	u8 args[4], xfer_rate = 0;
22aa4b32 BZ	123	struct ide_cmd cmd;
22aa4b32 BZ	124	struct ide_taskfile *tf = &cmd.tf;
05236ea6 BZ	125
	126	if (NULL == (void *) arg) {
	127	struct request *rq;
	128
ff005a06	129	rq = blk_get_request(drive->queue, REQ_OP_DRV_IN, 0);
2f5a8e80	130	ide_req(rq)->type = ATA_PRIV_TASKFILE;
b7819b92	131	blk_execute_rq(drive->queue, NULL, rq, 0);
17d5363b	132	err = scsi_req(rq)->result ? -EIO : 0;
05236ea6 BZ	133	blk_put_request(rq);
	134
	135	return err;
	136	}
	137
	138	if (copy_from_user(args, (void __user *)arg, 4))
	139	return -EFAULT;
	140
22aa4b32	141	memset(&cmd, 0, sizeof(cmd));
05236ea6 BZ	142	tf->feature = args[2];
	143	if (args[0] == ATA_CMD_SMART) {
	144	tf->nsect = args[3];
	145	tf->lbal = args[1];
6fcf0497 XY	146	tf->lbam = ATA_SMART_LBAM_PASS;
6fcf0497 XY	147	tf->lbah = ATA_SMART_LBAH_PASS;
60f85019 SS	148	cmd.valid.out.tf = IDE_VALID_OUT_TF;
60f85019 SS	149	cmd.valid.in.tf = IDE_VALID_NSECT;
05236ea6 BZ	150	} else {
05236ea6 BZ	151	tf->nsect = args[1];
60f85019 SS	152	cmd.valid.out.tf = IDE_VALID_FEATURE \| IDE_VALID_NSECT;
60f85019 SS	153	cmd.valid.in.tf = IDE_VALID_NSECT;
05236ea6 BZ	154	}
05236ea6 BZ	155	tf->command = args[0];
0dfb991c	156	cmd.protocol = args[3] ? ATA_PROT_PIO : ATA_PROT_NODATA;
05236ea6 BZ	157
05236ea6 BZ	158	if (args[3]) {
22aa4b32	159	cmd.tf_flags \|= IDE_TFLAG_IO_16BIT;
05236ea6 BZ	160	bufsize = SECTOR_SIZE * args[3];
	161	buf = kzalloc(bufsize, GFP_KERNEL);
	162	if (buf == NULL)
	163	return -ENOMEM;
	164	}
	165
	166	if (tf->command == ATA_CMD_SET_FEATURES &&
	167	tf->feature == SETFEATURES_XFER &&
a9c41509	168	tf->nsect >= XFER_SW_DMA_0) {
28c1969f	169	xfer_rate = ide_find_dma_mode(drive, tf->nsect);
a9c41509 BZ	170	if (xfer_rate != tf->nsect) {
a9c41509 BZ	171	err = -EINVAL;
05236ea6 BZ	172	goto abort;
05236ea6 BZ	173	}
665d66e8 BZ	174
665d66e8 BZ	175	cmd.tf_flags \|= IDE_TFLAG_SET_XFER;
05236ea6 BZ	176	}
05236ea6 BZ	177
22aa4b32	178	err = ide_raw_taskfile(drive, &cmd, buf, args[3]);
05236ea6 BZ	179
	180	args[0] = tf->status;
	181	args[1] = tf->error;
	182	args[2] = tf->nsect;
05236ea6 BZ	183	abort:
	184	if (copy_to_user((void __user *)arg, &args, 4))
	185	err = -EFAULT;
	186	if (buf) {
	187	if (copy_to_user((void __user *)(arg + 4), buf, bufsize))
	188	err = -EFAULT;
	189	kfree(buf);
	190	}
	191	return err;
	192	}
	193
22aa4b32	194	static int ide_task_ioctl(ide_drive_t *drive, unsigned long arg)
05236ea6 BZ	195	{
	196	void __user p = (void __user )arg;
	197	int err = 0;
	198	u8 args[7];
22aa4b32	199	struct ide_cmd cmd;
05236ea6 BZ	200
	201	if (copy_from_user(args, p, 7))
	202	return -EFAULT;
	203
22aa4b32	204	memset(&cmd, 0, sizeof(cmd));
745483f1	205	memcpy(&cmd.tf.feature, &args[1], 6);
22aa4b32	206	cmd.tf.command = args[0];
60f85019 SS	207	cmd.valid.out.tf = IDE_VALID_OUT_TF \| IDE_VALID_DEVICE;
60f85019 SS	208	cmd.valid.in.tf = IDE_VALID_IN_TF \| IDE_VALID_DEVICE;
05236ea6	209
22aa4b32	210	err = ide_no_data_taskfile(drive, &cmd);
05236ea6	211
22aa4b32	212	args[0] = cmd.tf.command;
745483f1	213	memcpy(&args[1], &cmd.tf.feature, 6);
05236ea6 BZ	214
	215	if (copy_to_user(p, args, 7))
	216	err = -EFAULT;
	217
	218	return err;
	219	}
	220
	221	static int generic_drive_reset(ide_drive_t *drive)
	222	{
	223	struct request *rq;
	224	int ret = 0;
	225
ff005a06	226	rq = blk_get_request(drive->queue, REQ_OP_DRV_IN, 0);
2f5a8e80	227	ide_req(rq)->type = ATA_PRIV_MISC;
82ed4db4 CH	228	scsi_req(rq)->cmd_len = 1;
82ed4db4 CH	229	scsi_req(rq)->cmd[0] = REQ_DRIVE_RESET;
b7819b92	230	blk_execute_rq(drive->queue, NULL, rq, 1);
17d5363b	231	ret = scsi_req(rq)->result;
05236ea6 BZ	232	blk_put_request(rq);
	233	return ret;
	234	}
	235
1bddd9e6	236	int generic_ide_ioctl(ide_drive_t drive, struct block_device bdev,
05236ea6 BZ	237	unsigned int cmd, unsigned long arg)
	238	{
	239	int err;
	240
	241	err = ide_setting_ioctl(drive, bdev, cmd, arg, ide_ioctl_settings);
	242	if (err != -EOPNOTSUPP)
	243	return err;
	244
	245	switch (cmd) {
	246	case HDIO_OBSOLETE_IDENTITY:
	247	case HDIO_GET_IDENTITY:
	248	if (bdev != bdev->bd_contains)
	249	return -EINVAL;
	250	return ide_get_identity_ioctl(drive, cmd, arg);
	251	case HDIO_GET_NICE:
	252	return ide_get_nice_ioctl(drive, arg);
	253	case HDIO_SET_NICE:
	254	if (!capable(CAP_SYS_ADMIN))
	255	return -EACCES;
	256	return ide_set_nice_ioctl(drive, arg);
	257	#ifdef CONFIG_IDE_TASK_IOCTL
	258	case HDIO_DRIVE_TASKFILE:
	259	if (!capable(CAP_SYS_ADMIN) \|\| !capable(CAP_SYS_RAWIO))
	260	return -EACCES;
	261	if (drive->media == ide_disk)
22aa4b32	262	return ide_taskfile_ioctl(drive, arg);
05236ea6 BZ	263	return -ENOMSG;
	264	#endif
	265	case HDIO_DRIVE_CMD:
	266	if (!capable(CAP_SYS_RAWIO))
	267	return -EACCES;
22aa4b32	268	return ide_cmd_ioctl(drive, arg);
05236ea6 BZ	269	case HDIO_DRIVE_TASK:
	270	if (!capable(CAP_SYS_RAWIO))
	271	return -EACCES;
22aa4b32	272	return ide_task_ioctl(drive, arg);
05236ea6 BZ	273	case HDIO_DRIVE_RESET:
	274	if (!capable(CAP_SYS_ADMIN))
	275	return -EACCES;
	276	return generic_drive_reset(drive);
	277	case HDIO_GET_BUSSTATE:
	278	if (!capable(CAP_SYS_ADMIN))
	279	return -EACCES;
	280	if (put_user(BUSSTATE_ON, (long __user *)arg))
	281	return -EFAULT;
	282	return 0;
	283	case HDIO_SET_BUSSTATE:
	284	if (!capable(CAP_SYS_ADMIN))
	285	return -EACCES;
	286	return -EOPNOTSUPP;
	287	default:
	288	return -EINVAL;
	289	}
	290	}
	291	EXPORT_SYMBOL(generic_ide_ioctl);