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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/* ------------------------------------------------------------
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
38struct scsi_cmnd;
39struct 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/* ------------------------------------------------------------
48 * Data Structures
49 */
50/* an RPA command/response transport queue */
51struct crq_queue {
52 struct viosrp_crq *msgs;
53 int size, cur;
54 dma_addr_t msg_token;
55 spinlock_t lock;
56};
57
58/* a unit of work for the hosting partition */
59struct srp_event_struct {
60 union viosrp_iu *xfer_iu;
61 struct scsi_cmnd *cmnd;
62 struct list_head list;
63 void (*done) (struct srp_event_struct *);
64 struct viosrp_crq crq;
65 struct ibmvscsi_host_data *hostdata;
66 atomic_t free;
67 union viosrp_iu iu;
68 void (*cmnd_done) (struct scsi_cmnd *);
69 struct completion comp;
70 union viosrp_iu *sync_srp;
FUJITA Tomonorief265672006-03-26 03:57:14 +090071 struct srp_direct_buf *ext_list;
James Bottomley4dddbc22005-09-06 17:11:54 -050072 dma_addr_t ext_list_token;
Linus Torvalds1da177e2005-04-16 15:20:36 -070073};
74
75/* a pool of event structs for use */
76struct event_pool {
77 struct srp_event_struct *events;
78 u32 size;
79 int next;
80 union viosrp_iu *iu_storage;
81 dma_addr_t iu_token;
82};
83
84/* all driver data associated with a host adapter */
85struct ibmvscsi_host_data {
86 atomic_t request_limit;
87 struct device *dev;
88 struct event_pool pool;
89 struct crq_queue queue;
90 struct tasklet_struct srp_task;
91 struct list_head sent;
92 struct Scsi_Host *host;
93 struct mad_adapter_info_data madapter_info;
94};
95
96/* routines for managing a command/response queue */
97int ibmvscsi_init_crq_queue(struct crq_queue *queue,
98 struct ibmvscsi_host_data *hostdata,
99 int max_requests);
100void ibmvscsi_release_crq_queue(struct crq_queue *queue,
101 struct ibmvscsi_host_data *hostdata,
102 int max_requests);
Dave C Boutcherbb585962005-11-15 09:53:00 -0600103int ibmvscsi_reset_crq_queue(struct crq_queue *queue,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104 struct ibmvscsi_host_data *hostdata);
105
Dave C Boutcher2b541f82006-01-19 13:34:44 -0600106int ibmvscsi_reenable_crq_queue(struct crq_queue *queue,
107 struct ibmvscsi_host_data *hostdata);
108
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109void ibmvscsi_handle_crq(struct viosrp_crq *crq,
110 struct ibmvscsi_host_data *hostdata);
111int ibmvscsi_send_crq(struct ibmvscsi_host_data *hostdata,
112 u64 word1, u64 word2);
113
114#endif /* IBMVSCSI_H */