1 /* ------------------------------------------------------------
2 * ibmvscsi.h
3 * (C) Copyright IBM Corporation 1994, 2003
4 * Authors: Colin DeVilbiss (devilbis@us.ibm.com)
5 * Santiago Leon (santil@us.ibm.com)
6 * Dave Boutcher (sleddog@us.ibm.com)
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
21 * USA
22 *
23 * ------------------------------------------------------------
24 * Emulation of a SCSI host adapter for Virtual I/O devices
25 *
26 * This driver allows the Linux SCSI peripheral drivers to directly
27 * access devices in the hosting partition, either on an iSeries
28 * hypervisor system or a converged hypervisor system.
29 */
30 #ifndef IBMVSCSI_H
31 #define IBMVSCSI_H
32 #include <linux/types.h>
33 #include <linux/list.h>
34 #include <linux/completion.h>
35 #include <linux/interrupt.h>
36 #include "viosrp.h"
37
38 struct scsi_cmnd;
39 struct Scsi_Host;
40
41 /* Number of indirect bufs...the list of these has to fit in the
42 * additional data of the srp_cmd struct along with the indirect
43 * descriptor
44 */
45 #define MAX_INDIRECT_BUFS 10
46
47 #define IBMVSCSI_MAX_REQUESTS_DEFAULT 100
48 #define IBMVSCSI_MAX_CMDS_PER_LUN 64
49
50 /* ------------------------------------------------------------
51 * Data Structures
52 */
53 /* an RPA command/response transport queue */
54 struct crq_queue {
55 struct viosrp_crq *msgs;
56 int size, cur;
57 dma_addr_t msg_token;
58 spinlock_t lock;
59 };
60
61 /* a unit of work for the hosting partition */
62 struct srp_event_struct {
63 union viosrp_iu *xfer_iu;
64 struct scsi_cmnd *cmnd;
65 struct list_head list;
66 void (*done) (struct srp_event_struct *);
67 struct viosrp_crq crq;
68 struct ibmvscsi_host_data *hostdata;
69 atomic_t free;
70 union viosrp_iu iu;
71 void (*cmnd_done) (struct scsi_cmnd *);
72 struct completion comp;
73 struct timer_list timer;
74 union viosrp_iu *sync_srp;
75 struct srp_direct_buf *ext_list;
76 dma_addr_t ext_list_token;
77 };
78
79 /* a pool of event structs for use */
80 struct event_pool {
81 struct srp_event_struct *events;
82 u32 size;
83 int next;
84 union viosrp_iu *iu_storage;
85 dma_addr_t iu_token;
86 };
87
88 /* all driver data associated with a host adapter */
89 struct ibmvscsi_host_data {
90 atomic_t request_limit;
91 struct device *dev;
92 struct event_pool pool;
93 struct crq_queue queue;
94 struct tasklet_struct srp_task;
95 struct list_head sent;
96 struct Scsi_Host *host;
97 struct mad_adapter_info_data madapter_info;
98 };
99
100 /* routines for managing a command/response queue */
101 void ibmvscsi_handle_crq(struct viosrp_crq *crq,
102 struct ibmvscsi_host_data *hostdata);
103
104 struct ibmvscsi_ops {
105 int (*init_crq_queue)(struct crq_queue *queue,
106 struct ibmvscsi_host_data *hostdata,
107 int max_requests);
108 void (*release_crq_queue)(struct crq_queue *queue,
109 struct ibmvscsi_host_data *hostdata,
110 int max_requests);
111 int (*reset_crq_queue)(struct crq_queue *queue,
112 struct ibmvscsi_host_data *hostdata);
113 int (*reenable_crq_queue)(struct crq_queue *queue,
114 struct ibmvscsi_host_data *hostdata);
115 int (*send_crq)(struct ibmvscsi_host_data *hostdata,
116 u64 word1, u64 word2);
117 };
118
119 extern struct ibmvscsi_ops iseriesvscsi_ops;
120 extern struct ibmvscsi_ops rpavscsi_ops;
121
122 #endif /* IBMVSCSI_H */
123
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