git://bbs.cooldavid.org / net-next-2.6.git / blame
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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 |
| 7912a0ac RJ |
48 | #define IBMVSCSI_CMDS_PER_LUN_DEFAULT 16 |
| 49 | #define IBMVSCSI_MAX_SECTORS_DEFAULT 256 /* 32 * 8 = default max I/O 32 pages */ | |
| 742d25b8 | 50 | #define IBMVSCSI_MAX_CMDS_PER_LUN 64 |
| a897ff2a | 51 | |
| 1da177e4 LT |
52 | /* ------------------------------------------------------------ |
| 53 | * Data Structures | |
| 54 | */ | |
| 55 | /* an RPA command/response transport queue */ | |
| 56 | struct crq_queue { | |
| 57 | struct viosrp_crq *msgs; | |
| 58 | int size, cur; | |
| 59 | dma_addr_t msg_token; | |
| 60 | spinlock_t lock; | |
| 61 | }; | |
| 62 | ||
| 63 | /* a unit of work for the hosting partition */ | |
| 64 | struct srp_event_struct { | |
| 65 | union viosrp_iu *xfer_iu; | |
| 66 | struct scsi_cmnd *cmnd; | |
| 67 | struct list_head list; | |
| 68 | void (*done) (struct srp_event_struct *); | |
| 69 | struct viosrp_crq crq; | |
| 70 | struct ibmvscsi_host_data *hostdata; | |
| 71 | atomic_t free; | |
| 72 | union viosrp_iu iu; | |
| 73 | void (*cmnd_done) (struct scsi_cmnd *); | |
| 74 | struct completion comp; | |
| 3d0e91f7 | 75 | struct timer_list timer; |
| 1da177e4 | 76 | union viosrp_iu *sync_srp; |
| ef265673 | 77 | struct srp_direct_buf *ext_list; |
| 4dddbc26 | 78 | dma_addr_t ext_list_token; |
| 1da177e4 LT |
79 | }; |
| 80 | ||
| 81 | /* a pool of event structs for use */ | |
| 82 | struct event_pool { | |
| 83 | struct srp_event_struct *events; | |
| 84 | u32 size; | |
| 85 | int next; | |
| 86 | union viosrp_iu *iu_storage; | |
| 87 | dma_addr_t iu_token; | |
| 88 | }; | |
| 89 | ||
| 90 | /* all driver data associated with a host adapter */ | |
| 91 | struct ibmvscsi_host_data { | |
| 92 | atomic_t request_limit; | |
| 93 | struct device *dev; | |
| 94 | struct event_pool pool; | |
| 95 | struct crq_queue queue; | |
| 96 | struct tasklet_struct srp_task; | |
| 97 | struct list_head sent; | |
| 98 | struct Scsi_Host *host; | |
| 99 | struct mad_adapter_info_data madapter_info; | |
| 100 | }; | |
| 101 | ||
| 102 | /* routines for managing a command/response queue */ | |
| 1da177e4 LT |
103 | void ibmvscsi_handle_crq(struct viosrp_crq *crq, |
| 104 | struct ibmvscsi_host_data *hostdata); | |
| d3849d51 DW |
105 | |
| 106 | struct ibmvscsi_ops { | |
| 107 | int (*init_crq_queue)(struct crq_queue *queue, | |
| 108 | struct ibmvscsi_host_data *hostdata, | |
| 109 | int max_requests); | |
| 110 | void (*release_crq_queue)(struct crq_queue *queue, | |
| 111 | struct ibmvscsi_host_data *hostdata, | |
| 112 | int max_requests); | |
| 113 | int (*reset_crq_queue)(struct crq_queue *queue, | |
| 114 | struct ibmvscsi_host_data *hostdata); | |
| 115 | int (*reenable_crq_queue)(struct crq_queue *queue, | |
| 116 | struct ibmvscsi_host_data *hostdata); | |
| 117 | int (*send_crq)(struct ibmvscsi_host_data *hostdata, | |
| 118 | u64 word1, u64 word2); | |
| 119 | }; | |
| 120 | ||
| 121 | extern struct ibmvscsi_ops iseriesvscsi_ops; | |
| 122 | extern struct ibmvscsi_ops rpavscsi_ops; | |
| 1da177e4 LT |
123 | |
| 124 | #endif /* IBMVSCSI_H */ |