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
24struct scsi_cmnd;
25struct 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 */
43struct 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 */
51struct 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 */
69struct 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
77enum 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 */
85struct 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

source code of linux/drivers/scsi/ibmvscsi/ibmvscsi.h