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// 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_check_proto(struct sg_io_v4 *hdr)
{
if (hdr->protocol != BSG_PROTOCOL_SCSI ||
hdr->subprotocol != BSG_SUB_PROTOCOL_SCSI_CMD)
return -EINVAL;
return 0;
}
static int scsi_bsg_fill_hdr(struct request *rq, struct sg_io_v4 *hdr,
fmode_t mode)
{
struct scsi_request *sreq = scsi_req(rq);
if (hdr->dout_xfer_len && hdr->din_xfer_len) {
pr_warn_once("BIDI support in bsg has been removed.\n");
return -EOPNOTSUPP;
}
sreq->cmd_len = hdr->request_len;
if (sreq->cmd_len > BLK_MAX_CDB) {
sreq->cmd = kzalloc(sreq->cmd_len, GFP_KERNEL);
if (!sreq->cmd)
return -ENOMEM;
}
if (copy_from_user(sreq->cmd, uptr64(hdr->request), sreq->cmd_len))
return -EFAULT;
if (!scsi_cmd_allowed(sreq->cmd, mode))
return -EPERM;
return 0;
}
static int scsi_bsg_complete_rq(struct request *rq, struct sg_io_v4 *hdr)
{
struct scsi_request *sreq = scsi_req(rq);
int ret = 0;
/*
* 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 (sreq->sense_len && hdr->response) {
int len = min_t(unsigned int, hdr->max_response_len,
sreq->sense_len);
if (copy_to_user(uptr64(hdr->response), sreq->sense, 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;
return ret;
}
static void scsi_bsg_free_rq(struct request *rq)
{
scsi_req_free_cmd(scsi_req(rq));
}
static const struct bsg_ops scsi_bsg_ops = {
.check_proto = scsi_bsg_check_proto,
.fill_hdr = scsi_bsg_fill_hdr,
.complete_rq = scsi_bsg_complete_rq,
.free_rq = scsi_bsg_free_rq,
};
int scsi_bsg_register_queue(struct request_queue *q, struct device *parent)
{
return bsg_register_queue(q, parent, dev_name(parent), &scsi_bsg_ops);
}
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