xref: /openbmc/linux/drivers/scsi/snic/snic_io.h (revision dfb99b05)
1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /* Copyright 2014 Cisco Systems, Inc.  All rights reserved. */
3 
4 #ifndef _SNIC_IO_H
5 #define _SNIC_IO_H
6 
7 #define SNIC_DFLT_SG_DESC_CNT	32	/* Default descriptors for sgl */
8 #define SNIC_MAX_SG_DESC_CNT	60	/* Max descriptor for sgl */
9 #define SNIC_SG_DESC_ALIGN	16	/* Descriptor address alignment */
10 
11 /* SG descriptor for snic */
12 struct snic_sg_desc {
13 	__le64 addr;
14 	__le32 len;
15 	u32 _resvd;
16 };
17 
18 struct snic_dflt_sgl {
19 	struct snic_sg_desc sg_desc[SNIC_DFLT_SG_DESC_CNT];
20 };
21 
22 struct snic_max_sgl {
23 	struct snic_sg_desc sg_desc[SNIC_MAX_SG_DESC_CNT];
24 };
25 
26 enum snic_req_cache_type {
27 	SNIC_REQ_CACHE_DFLT_SGL = 0,	/* cache with default size sgl */
28 	SNIC_REQ_CACHE_MAX_SGL,		/* cache with max size sgl */
29 	SNIC_REQ_TM_CACHE,		/* cache for task mgmt reqs contains
30 					   snic_host_req objects only*/
31 	SNIC_REQ_MAX_CACHES		/* number of sgl caches */
32 };
33 
34 /* Per IO internal state */
35 struct snic_internal_io_state {
36 	char	*rqi;
37 	u64	flags;
38 	u32	state;
39 	u32	abts_status;	/* Abort completion status */
40 	u32	lr_status;	/* device reset completion status */
41 };
42 
43 /* IO state machine */
44 enum snic_ioreq_state {
45 	SNIC_IOREQ_NOT_INITED = 0,
46 	SNIC_IOREQ_PENDING,
47 	SNIC_IOREQ_ABTS_PENDING,
48 	SNIC_IOREQ_ABTS_COMPLETE,
49 	SNIC_IOREQ_LR_PENDING,
50 	SNIC_IOREQ_LR_COMPLETE,
51 	SNIC_IOREQ_COMPLETE,
52 };
53 
54 struct snic;
55 struct snic_host_req;
56 
57 /*
58  * snic_req_info : Contains info about IO, one per scsi command.
59  * Notes: Make sure that the structure is aligned to 16 B
60  * this helps in easy access to snic_req_info from snic_host_req
61  */
62 struct snic_req_info {
63 	struct list_head list;
64 	struct snic_host_req *req;
65 	u64	start_time;		/* start time in jiffies */
66 	u16	rq_pool_type;		/* noticion of request pool type */
67 	u16	req_len;		/* buf len passing to fw (req + sgl)*/
68 	u32	tgt_id;
69 
70 	u32	tm_tag;
71 	u8	io_cmpl:1;		/* sets to 1 when fw completes IO */
72 	u8	resvd[3];
73 	struct scsi_cmnd *sc;		/* Associated scsi cmd */
74 	struct snic	*snic;		/* Associated snic */
75 	ulong	sge_va;			/* Pointer to Resp Buffer */
76 	u64	snsbuf_va;
77 
78 	struct snic_host_req *abort_req;
79 	struct completion *abts_done;
80 
81 	struct snic_host_req *dr_req;
82 	struct completion *dr_done;
83 };
84 
85 
86 #define rqi_to_req(rqi)	\
87 	((struct snic_host_req *) (((struct snic_req_info *)rqi)->req))
88 
89 #define req_to_rqi(req)	\
90 	((struct snic_req_info *) (((struct snic_host_req *)req)->hdr.init_ctx))
91 
92 #define req_to_sgl(req)	\
93 	((struct snic_sg_desc *) (((struct snic_host_req *)req)+1))
94 
95 struct snic_req_info *
96 snic_req_init(struct snic *, int sg_cnt);
97 void snic_req_free(struct snic *, struct snic_req_info *);
98 void snic_calc_io_process_time(struct snic *, struct snic_req_info *);
99 void snic_pci_unmap_rsp_buf(struct snic *, struct snic_req_info *);
100 struct snic_host_req *
101 snic_abort_req_init(struct snic *, struct snic_req_info *);
102 struct snic_host_req *
103 snic_dr_req_init(struct snic *, struct snic_req_info *);
104 #endif /* _SNIC_IO_H */
105