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 <scsi/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_CMDS_PER_LUN_DEFAULT 16 49 #define IBMVSCSI_MAX_SECTORS_DEFAULT 256 /* 32 * 8 = default max I/O 32 pages */ 50 #define IBMVSCSI_MAX_CMDS_PER_LUN 64 51 #define IBMVSCSI_MAX_LUN 32 52 53 /* ------------------------------------------------------------ 54 * Data Structures 55 */ 56 /* an RPA command/response transport queue */ 57 struct crq_queue { 58 struct viosrp_crq *msgs; 59 int size, cur; 60 dma_addr_t msg_token; 61 spinlock_t lock; 62 }; 63 64 /* a unit of work for the hosting partition */ 65 struct srp_event_struct { 66 union viosrp_iu *xfer_iu; 67 struct scsi_cmnd *cmnd; 68 struct list_head list; 69 void (*done) (struct srp_event_struct *); 70 struct viosrp_crq crq; 71 struct ibmvscsi_host_data *hostdata; 72 atomic_t free; 73 union viosrp_iu iu; 74 void (*cmnd_done) (struct scsi_cmnd *); 75 struct completion comp; 76 struct timer_list timer; 77 union viosrp_iu *sync_srp; 78 struct srp_direct_buf *ext_list; 79 dma_addr_t ext_list_token; 80 }; 81 82 /* a pool of event structs for use */ 83 struct event_pool { 84 struct srp_event_struct *events; 85 u32 size; 86 int next; 87 union viosrp_iu *iu_storage; 88 dma_addr_t iu_token; 89 }; 90 91 /* all driver data associated with a host adapter */ 92 struct ibmvscsi_host_data { 93 atomic_t request_limit; 94 int client_migrated; 95 int reset_crq; 96 int reenable_crq; 97 struct device *dev; 98 struct event_pool pool; 99 struct crq_queue queue; 100 struct tasklet_struct srp_task; 101 struct list_head sent; 102 struct Scsi_Host *host; 103 struct task_struct *work_thread; 104 wait_queue_head_t work_wait_q; 105 struct mad_adapter_info_data madapter_info; 106 struct capabilities caps; 107 dma_addr_t caps_addr; 108 dma_addr_t adapter_info_addr; 109 }; 110 111 #endif /* IBMVSCSI_H */ 112