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Thomas Gleixner1a59d1b82019-05-27 08:55:05 +02001/* SPDX-License-Identifier: GPL-2.0-or-later */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002/* ------------------------------------------------------------
3 * ibmvscsi.h
4 * (C) Copyright IBM Corporation 1994, 2003
5 * Authors: Colin DeVilbiss ([email protected])
6 * Santiago Leon ([email protected])
7 * Dave Boutcher ([email protected])
8 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07009 * ------------------------------------------------------------
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>
Bryant G. Ly88a678b2016-06-28 17:05:35 -050022#include <scsi/viosrp.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070023
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
Robert Jenningsa897ff22007-03-28 12:45:46 -050033#define IBMVSCSI_MAX_REQUESTS_DEFAULT 100
Robert Jennings7912a0a2008-07-24 04:35:27 +100034#define IBMVSCSI_CMDS_PER_LUN_DEFAULT 16
35#define IBMVSCSI_MAX_SECTORS_DEFAULT 256 /* 32 * 8 = default max I/O 32 pages */
Brian King742d25b2007-05-29 15:46:14 -050036#define IBMVSCSI_MAX_CMDS_PER_LUN 64
Laurent Vivier3467a142015-11-09 17:49:09 +010037#define IBMVSCSI_MAX_LUN 32
Robert Jenningsa897ff22007-03-28 12:45:46 -050038
Linus Torvalds1da177e2005-04-16 15:20:36 -070039/* ------------------------------------------------------------
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;
Brian King3d0e91f2007-06-13 17:12:26 -050062 struct timer_list timer;
Linus Torvalds1da177e2005-04-16 15:20:36 -070063 union viosrp_iu *sync_srp;
FUJITA Tomonorief265672006-03-26 03:57:14 +090064 struct srp_direct_buf *ext_list;
James Bottomley4dddbc22005-09-06 17:11:54 -050065 dma_addr_t ext_list_token;
Linus Torvalds1da177e2005-04-16 15:20:36 -070066};
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
77/* all driver data associated with a host adapter */
78struct ibmvscsi_host_data {
Tyrel Datwyler32d6e4b2016-12-07 16:04:35 -060079 struct list_head host_list;
Linus Torvalds1da177e2005-04-16 15:20:36 -070080 atomic_t request_limit;
Brian King126c5cc2009-06-08 16:19:08 -050081 int client_migrated;
Brian King0f33ece2010-06-17 13:56:00 -050082 int reset_crq;
83 int reenable_crq;
Linus Torvalds1da177e2005-04-16 15:20:36 -070084 struct device *dev;
85 struct event_pool pool;
86 struct crq_queue queue;
87 struct tasklet_struct srp_task;
88 struct list_head sent;
89 struct Scsi_Host *host;
Brian King0f33ece2010-06-17 13:56:00 -050090 struct task_struct *work_thread;
91 wait_queue_head_t work_wait_q;
Linus Torvalds1da177e2005-04-16 15:20:36 -070092 struct mad_adapter_info_data madapter_info;
Brian King126c5cc2009-06-08 16:19:08 -050093 struct capabilities caps;
94 dma_addr_t caps_addr;
95 dma_addr_t adapter_info_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -070096};
97
Linus Torvalds1da177e2005-04-16 15:20:36 -070098#endif /* IBMVSCSI_H */