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 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#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 52/* ------------------------------------------------------------ 53 * Data Structures 54 */ 55/* an RPA command/response transport queue */ 56struct 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 */ 64struct 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; 75 struct timer_list timer; 76 union viosrp_iu *sync_srp; 77 struct srp_direct_buf *ext_list; 78 dma_addr_t ext_list_token; 79}; 80 81/* a pool of event structs for use */ 82struct 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 */ 91struct ibmvscsi_host_data { 92 atomic_t request_limit; 93 int client_migrated; 94 int reset_crq; 95 int reenable_crq; 96 struct device *dev; 97 struct event_pool pool; 98 struct crq_queue queue; 99 struct tasklet_struct srp_task; 100 struct list_head sent; 101 struct Scsi_Host *host; 102 struct task_struct *work_thread; 103 wait_queue_head_t work_wait_q; 104 struct mad_adapter_info_data madapter_info; 105 struct capabilities caps; 106 dma_addr_t caps_addr; 107 dma_addr_t adapter_info_addr; 108}; 109 110/* routines for managing a command/response queue */ 111void ibmvscsi_handle_crq(struct viosrp_crq *crq, 112 struct ibmvscsi_host_data *hostdata); 113 114struct ibmvscsi_ops { 115 int (*init_crq_queue)(struct crq_queue *queue, 116 struct ibmvscsi_host_data *hostdata, 117 int max_requests); 118 void (*release_crq_queue)(struct crq_queue *queue, 119 struct ibmvscsi_host_data *hostdata, 120 int max_requests); 121 int (*reset_crq_queue)(struct crq_queue *queue, 122 struct ibmvscsi_host_data *hostdata); 123 int (*reenable_crq_queue)(struct crq_queue *queue, 124 struct ibmvscsi_host_data *hostdata); 125 int (*send_crq)(struct ibmvscsi_host_data *hostdata, 126 u64 word1, u64 word2); 127 int (*resume) (struct ibmvscsi_host_data *hostdata); 128}; 129 130extern struct ibmvscsi_ops iseriesvscsi_ops; 131extern struct ibmvscsi_ops rpavscsi_ops; 132 133#endif /* IBMVSCSI_H */ 134