Merge tag '5.17-rc-ksmbd-server-fixes' of git://git.samba.org/ksmbd
[linux-2.6-microblaze.git] / drivers / scsi / scsi_bsg.c
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
12 static int scsi_bsg_sg_io_fn(struct request_queue *q, struct sg_io_v4 *hdr,
13                 fmode_t mode, unsigned int timeout)
14 {
15         struct scsi_request *sreq;
16         struct request *rq;
17         struct bio *bio;
18         int ret;
19
20         if (hdr->protocol != BSG_PROTOCOL_SCSI  ||
21             hdr->subprotocol != BSG_SUB_PROTOCOL_SCSI_CMD)
22                 return -EINVAL;
23         if (hdr->dout_xfer_len && hdr->din_xfer_len) {
24                 pr_warn_once("BIDI support in bsg has been removed.\n");
25                 return -EOPNOTSUPP;
26         }
27
28         rq = scsi_alloc_request(q, hdr->dout_xfer_len ?
29                                 REQ_OP_DRV_OUT : REQ_OP_DRV_IN, 0);
30         if (IS_ERR(rq))
31                 return PTR_ERR(rq);
32         rq->timeout = timeout;
33
34         ret = -ENOMEM;
35         sreq = scsi_req(rq);
36         sreq->cmd_len = hdr->request_len;
37         if (sreq->cmd_len > BLK_MAX_CDB) {
38                 sreq->cmd = kzalloc(sreq->cmd_len, GFP_KERNEL);
39                 if (!sreq->cmd)
40                         goto out_put_request;
41         }
42
43         ret = -EFAULT;
44         if (copy_from_user(sreq->cmd, uptr64(hdr->request), sreq->cmd_len))
45                 goto out_free_cmd;
46         ret = -EPERM;
47         if (!scsi_cmd_allowed(sreq->cmd, mode))
48                 goto out_free_cmd;
49
50         ret = 0;
51         if (hdr->dout_xfer_len) {
52                 ret = blk_rq_map_user(rq->q, rq, NULL, uptr64(hdr->dout_xferp),
53                                 hdr->dout_xfer_len, GFP_KERNEL);
54         } else if (hdr->din_xfer_len) {
55                 ret = blk_rq_map_user(rq->q, rq, NULL, uptr64(hdr->din_xferp),
56                                 hdr->din_xfer_len, GFP_KERNEL);
57         }
58
59         if (ret)
60                 goto out_free_cmd;
61
62         bio = rq->bio;
63         blk_execute_rq(rq, !(hdr->flags & BSG_FLAG_Q_AT_TAIL));
64
65         /*
66          * fill in all the output members
67          */
68         hdr->device_status = sreq->result & 0xff;
69         hdr->transport_status = host_byte(sreq->result);
70         hdr->driver_status = 0;
71         if (scsi_status_is_check_condition(sreq->result))
72                 hdr->driver_status = DRIVER_SENSE;
73         hdr->info = 0;
74         if (hdr->device_status || hdr->transport_status || hdr->driver_status)
75                 hdr->info |= SG_INFO_CHECK;
76         hdr->response_len = 0;
77
78         if (sreq->sense_len && hdr->response) {
79                 int len = min_t(unsigned int, hdr->max_response_len,
80                                         sreq->sense_len);
81
82                 if (copy_to_user(uptr64(hdr->response), sreq->sense, len))
83                         ret = -EFAULT;
84                 else
85                         hdr->response_len = len;
86         }
87
88         if (rq_data_dir(rq) == READ)
89                 hdr->din_resid = sreq->resid_len;
90         else
91                 hdr->dout_resid = sreq->resid_len;
92
93         blk_rq_unmap_user(bio);
94
95 out_free_cmd:
96         scsi_req_free_cmd(scsi_req(rq));
97 out_put_request:
98         blk_mq_free_request(rq);
99         return ret;
100 }
101
102 struct bsg_device *scsi_bsg_register_queue(struct scsi_device *sdev)
103 {
104         return bsg_register_queue(sdev->request_queue, &sdev->sdev_gendev,
105                         dev_name(&sdev->sdev_gendev), scsi_bsg_sg_io_fn);
106 }