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1da177e4 LT |
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 | ||
a897ff2a | 47 | #define IBMVSCSI_MAX_REQUESTS_DEFAULT 100 |
742d25b8 | 48 | #define IBMVSCSI_MAX_CMDS_PER_LUN 64 |
a897ff2a | 49 | |
1da177e4 LT |
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; | |
3d0e91f7 | 73 | struct timer_list timer; |
1da177e4 | 74 | union viosrp_iu *sync_srp; |
ef265673 | 75 | struct srp_direct_buf *ext_list; |
4dddbc26 | 76 | dma_addr_t ext_list_token; |
1da177e4 LT |
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 | int ibmvscsi_init_crq_queue(struct crq_queue *queue, | |
102 | struct ibmvscsi_host_data *hostdata, | |
103 | int max_requests); | |
104 | void ibmvscsi_release_crq_queue(struct crq_queue *queue, | |
105 | struct ibmvscsi_host_data *hostdata, | |
106 | int max_requests); | |
bb58596f | 107 | int ibmvscsi_reset_crq_queue(struct crq_queue *queue, |
1da177e4 LT |
108 | struct ibmvscsi_host_data *hostdata); |
109 | ||
2b541f8f DB |
110 | int ibmvscsi_reenable_crq_queue(struct crq_queue *queue, |
111 | struct ibmvscsi_host_data *hostdata); | |
112 | ||
1da177e4 LT |
113 | void ibmvscsi_handle_crq(struct viosrp_crq *crq, |
114 | struct ibmvscsi_host_data *hostdata); | |
115 | int ibmvscsi_send_crq(struct ibmvscsi_host_data *hostdata, | |
116 | u64 word1, u64 word2); | |
117 | ||
118 | #endif /* IBMVSCSI_H */ |