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