[linux-2.6-block.git] / drivers / scsi / scsi_bsg.c

// SPDX-License-Identifier: GPL-2.0
#include <linux/bsg.h>
#include <scsi/scsi.h>
#include <scsi/scsi_ioctl.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_device.h>
#include <scsi/sg.h>
#include "scsi_priv.h"

#define uptr64(val) ((void __user *)(uintptr_t)(val))

static int scsi_bsg_sg_io_fn(struct request_queue *q, struct sg_io_v4 *hdr,
		fmode_t mode, unsigned int timeout)
{
	struct scsi_request *sreq;
	struct scsi_cmnd *scmd;
	struct request *rq;
	struct bio *bio;
	int ret;

	if (hdr->protocol != BSG_PROTOCOL_SCSI  ||
	    hdr->subprotocol != BSG_SUB_PROTOCOL_SCSI_CMD)
		return -EINVAL;
	if (hdr->dout_xfer_len && hdr->din_xfer_len) {
		pr_warn_once("BIDI support in bsg has been removed.\n");
		return -EOPNOTSUPP;
	}

	rq = scsi_alloc_request(q, hdr->dout_xfer_len ?
				REQ_OP_DRV_OUT : REQ_OP_DRV_IN, 0);
	if (IS_ERR(rq))
		return PTR_ERR(rq);
	rq->timeout = timeout;

	ret = -ENOMEM;
	sreq = scsi_req(rq);
	scmd = blk_mq_rq_to_pdu(rq);
	scmd->cmd_len = hdr->request_len;
	if (scmd->cmd_len > sizeof(scmd->cmnd)) {
		ret = -EINVAL;
		goto out_put_request;
	}

	ret = -EFAULT;
	if (copy_from_user(scmd->cmnd, uptr64(hdr->request), scmd->cmd_len))
		goto out_put_request;
	ret = -EPERM;
	if (!scsi_cmd_allowed(scmd->cmnd, mode))
		goto out_put_request;

	ret = 0;
	if (hdr->dout_xfer_len) {
		ret = blk_rq_map_user(rq->q, rq, NULL, uptr64(hdr->dout_xferp),
				hdr->dout_xfer_len, GFP_KERNEL);
	} else if (hdr->din_xfer_len) {
		ret = blk_rq_map_user(rq->q, rq, NULL, uptr64(hdr->din_xferp),
				hdr->din_xfer_len, GFP_KERNEL);
	}

	if (ret)
		goto out_put_request;

	bio = rq->bio;
	blk_execute_rq(rq, !(hdr->flags & BSG_FLAG_Q_AT_TAIL));

	/*
	 * fill in all the output members
	 */
	hdr->device_status = sreq->result & 0xff;
	hdr->transport_status = host_byte(sreq->result);
	hdr->driver_status = 0;
	if (scsi_status_is_check_condition(sreq->result))
		hdr->driver_status = DRIVER_SENSE;
	hdr->info = 0;
	if (hdr->device_status || hdr->transport_status || hdr->driver_status)
		hdr->info |= SG_INFO_CHECK;
	hdr->response_len = 0;

	if (scmd->sense_len && hdr->response) {
		int len = min_t(unsigned int, hdr->max_response_len,
				scmd->sense_len);

		if (copy_to_user(uptr64(hdr->response), scmd->sense_buffer,
				 len))
			ret = -EFAULT;
		else
			hdr->response_len = len;
	}

	if (rq_data_dir(rq) == READ)
		hdr->din_resid = sreq->resid_len;
	else
		hdr->dout_resid = sreq->resid_len;

	blk_rq_unmap_user(bio);

out_put_request:
	blk_mq_free_request(rq);
	return ret;
}

struct bsg_device *scsi_bsg_register_queue(struct scsi_device *sdev)
{
	return bsg_register_queue(sdev->request_queue, &sdev->sdev_gendev,
			dev_name(&sdev->sdev_gendev), scsi_bsg_sg_io_fn);
}
Commit	Line	Data
78011042 CH	1	// SPDX-License-Identifier: GPL-2.0
	2	#include <linux/bsg.h>
	3	#include <scsi/scsi.h>
	4	#include <scsi/scsi_ioctl.h>
	5	#include <scsi/scsi_cmnd.h>
	6	#include <scsi/scsi_device.h>
	7	#include <scsi/sg.h>
	8	#include "scsi_priv.h"
	9
	10	#define uptr64(val) ((void __user *)(uintptr_t)(val))
	11
75ca5640 CH	12	static int scsi_bsg_sg_io_fn(struct request_queue q, struct sg_io_v4 hdr,
75ca5640 CH	13	fmode_t mode, unsigned int timeout)
78011042	14	{
75ca5640	15	struct scsi_request *sreq;
ce70fd9a	16	struct scsi_cmnd *scmd;
75ca5640 CH	17	struct request *rq;
	18	struct bio *bio;
	19	int ret;
	20
78011042 CH	21	if (hdr->protocol != BSG_PROTOCOL_SCSI \|\|
	22	hdr->subprotocol != BSG_SUB_PROTOCOL_SCSI_CMD)
	23	return -EINVAL;
78011042 CH	24	if (hdr->dout_xfer_len && hdr->din_xfer_len) {
	25	pr_warn_once("BIDI support in bsg has been removed.\n");
	26	return -EOPNOTSUPP;
	27	}
	28
68ec3b81 CH	29	rq = scsi_alloc_request(q, hdr->dout_xfer_len ?
68ec3b81 CH	30	REQ_OP_DRV_OUT : REQ_OP_DRV_IN, 0);
75ca5640 CH	31	if (IS_ERR(rq))
	32	return PTR_ERR(rq);
	33	rq->timeout = timeout;
	34
	35	ret = -ENOMEM;
	36	sreq = scsi_req(rq);
ce70fd9a CH	37	scmd = blk_mq_rq_to_pdu(rq);
	38	scmd->cmd_len = hdr->request_len;
	39	if (scmd->cmd_len > sizeof(scmd->cmnd)) {
	40	ret = -EINVAL;
	41	goto out_put_request;
78011042 CH	42	}
78011042 CH	43
75ca5640	44	ret = -EFAULT;
ce70fd9a CH	45	if (copy_from_user(scmd->cmnd, uptr64(hdr->request), scmd->cmd_len))
ce70fd9a CH	46	goto out_put_request;
75ca5640	47	ret = -EPERM;
ce70fd9a CH	48	if (!scsi_cmd_allowed(scmd->cmnd, mode))
ce70fd9a CH	49	goto out_put_request;
78011042	50
5c0f6137	51	ret = 0;
75ca5640 CH	52	if (hdr->dout_xfer_len) {
	53	ret = blk_rq_map_user(rq->q, rq, NULL, uptr64(hdr->dout_xferp),
	54	hdr->dout_xfer_len, GFP_KERNEL);
	55	} else if (hdr->din_xfer_len) {
	56	ret = blk_rq_map_user(rq->q, rq, NULL, uptr64(hdr->din_xferp),
	57	hdr->din_xfer_len, GFP_KERNEL);
	58	}
	59
	60	if (ret)
ce70fd9a	61	goto out_put_request;
75ca5640 CH	62
75ca5640 CH	63	bio = rq->bio;
b84ba30b	64	blk_execute_rq(rq, !(hdr->flags & BSG_FLAG_Q_AT_TAIL));
78011042 CH	65
	66	/*
	67	* fill in all the output members
	68	*/
	69	hdr->device_status = sreq->result & 0xff;
	70	hdr->transport_status = host_byte(sreq->result);
	71	hdr->driver_status = 0;
	72	if (scsi_status_is_check_condition(sreq->result))
	73	hdr->driver_status = DRIVER_SENSE;
	74	hdr->info = 0;
	75	if (hdr->device_status \|\| hdr->transport_status \|\| hdr->driver_status)
	76	hdr->info \|= SG_INFO_CHECK;
	77	hdr->response_len = 0;
	78
5b794f98	79	if (scmd->sense_len && hdr->response) {
78011042	80	int len = min_t(unsigned int, hdr->max_response_len,
5b794f98	81	scmd->sense_len);
78011042	82
5b794f98 CH	83	if (copy_to_user(uptr64(hdr->response), scmd->sense_buffer,
5b794f98 CH	84	len))
78011042 CH	85	ret = -EFAULT;
	86	else
	87	hdr->response_len = len;
	88	}
	89
	90	if (rq_data_dir(rq) == READ)
	91	hdr->din_resid = sreq->resid_len;
	92	else
	93	hdr->dout_resid = sreq->resid_len;
	94
75ca5640	95	blk_rq_unmap_user(bio);
78011042	96
75ca5640	97	out_put_request:
0bf6d96c	98	blk_mq_free_request(rq);
75ca5640	99	return ret;
78011042 CH	100	}
78011042 CH	101
ead09dd3	102	struct bsg_device scsi_bsg_register_queue(struct scsi_device sdev)
78011042	103	{
ead09dd3	104	return bsg_register_queue(sdev->request_queue, &sdev->sdev_gendev,
75ca5640	105	dev_name(&sdev->sdev_gendev), scsi_bsg_sg_io_fn);
78011042	106	}