1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
2 | /* ------------------------------------------------------------ |
3 | * ibmvscsi.h |
4 | * (C) Copyright IBM Corporation 1994, 2003 |
5 | * Authors: Colin DeVilbiss (devilbis@us.ibm.com) |
6 | * Santiago Leon (santil@us.ibm.com) |
7 | * Dave Boutcher (sleddog@us.ibm.com) |
8 | * |
9 | * ------------------------------------------------------------ |
10 | * Emulation of a SCSI host adapter for Virtual I/O devices |
11 | * |
12 | * This driver allows the Linux SCSI peripheral drivers to directly |
13 | * access devices in the hosting partition, either on an iSeries |
14 | * hypervisor system or a converged hypervisor system. |
15 | */ |
16 | #ifndef IBMVSCSI_H |
17 | #define IBMVSCSI_H |
18 | #include <linux/types.h> |
19 | #include <linux/list.h> |
20 | #include <linux/completion.h> |
21 | #include <linux/interrupt.h> |
22 | #include <scsi/viosrp.h> |
23 | |
24 | struct scsi_cmnd; |
25 | struct Scsi_Host; |
26 | |
27 | /* Number of indirect bufs...the list of these has to fit in the |
28 | * additional data of the srp_cmd struct along with the indirect |
29 | * descriptor |
30 | */ |
31 | #define MAX_INDIRECT_BUFS 10 |
32 | |
33 | #define IBMVSCSI_MAX_REQUESTS_DEFAULT 100 |
34 | #define IBMVSCSI_CMDS_PER_LUN_DEFAULT 16 |
35 | #define IBMVSCSI_MAX_SECTORS_DEFAULT 256 /* 32 * 8 = default max I/O 32 pages */ |
36 | #define IBMVSCSI_MAX_CMDS_PER_LUN 64 |
37 | #define IBMVSCSI_MAX_LUN 32 |
38 | |
39 | /* ------------------------------------------------------------ |
40 | * Data Structures |
41 | */ |
42 | /* an RPA command/response transport queue */ |
43 | struct crq_queue { |
44 | struct viosrp_crq *msgs; |
45 | int size, cur; |
46 | dma_addr_t msg_token; |
47 | spinlock_t lock; |
48 | }; |
49 | |
50 | /* a unit of work for the hosting partition */ |
51 | struct srp_event_struct { |
52 | union viosrp_iu *xfer_iu; |
53 | struct scsi_cmnd *cmnd; |
54 | struct list_head list; |
55 | void (*done) (struct srp_event_struct *); |
56 | struct viosrp_crq crq; |
57 | struct ibmvscsi_host_data *hostdata; |
58 | atomic_t free; |
59 | union viosrp_iu iu; |
60 | void (*cmnd_done) (struct scsi_cmnd *); |
61 | struct completion comp; |
62 | struct timer_list timer; |
63 | union viosrp_iu *sync_srp; |
64 | struct srp_direct_buf *ext_list; |
65 | dma_addr_t ext_list_token; |
66 | }; |
67 | |
68 | /* a pool of event structs for use */ |
69 | struct event_pool { |
70 | struct srp_event_struct *events; |
71 | u32 size; |
72 | int next; |
73 | union viosrp_iu *iu_storage; |
74 | dma_addr_t iu_token; |
75 | }; |
76 | |
77 | enum ibmvscsi_host_action { |
78 | IBMVSCSI_HOST_ACTION_NONE = 0, |
79 | IBMVSCSI_HOST_ACTION_RESET, |
80 | IBMVSCSI_HOST_ACTION_REENABLE, |
81 | IBMVSCSI_HOST_ACTION_UNBLOCK, |
82 | }; |
83 | |
84 | /* all driver data associated with a host adapter */ |
85 | struct ibmvscsi_host_data { |
86 | struct list_head host_list; |
87 | atomic_t request_limit; |
88 | int client_migrated; |
89 | enum ibmvscsi_host_action action; |
90 | struct device *dev; |
91 | struct event_pool pool; |
92 | struct crq_queue queue; |
93 | struct tasklet_struct srp_task; |
94 | struct list_head sent; |
95 | struct Scsi_Host *host; |
96 | struct task_struct *work_thread; |
97 | wait_queue_head_t work_wait_q; |
98 | struct mad_adapter_info_data madapter_info; |
99 | struct capabilities caps; |
100 | dma_addr_t caps_addr; |
101 | dma_addr_t adapter_info_addr; |
102 | }; |
103 | |
104 | #endif /* IBMVSCSI_H */ |
105 | |