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 47 /* ------------------------------------------------------------ 48 * Data Structures 49 */ 50 /* an RPA command/response transport queue */ 51 struct 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 */ 59 struct 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; 71 struct srp_direct_buf *ext_list; 72 dma_addr_t ext_list_token; 73 }; 74 75 /* a pool of event structs for use */ 76 struct 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 */ 85 struct 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 */ 97 int ibmvscsi_init_crq_queue(struct crq_queue *queue, 98 struct ibmvscsi_host_data *hostdata, 99 int max_requests); 100 void ibmvscsi_release_crq_queue(struct crq_queue *queue, 101 struct ibmvscsi_host_data *hostdata, 102 int max_requests); 103 int ibmvscsi_reset_crq_queue(struct crq_queue *queue, 104 struct ibmvscsi_host_data *hostdata); 105 106 int ibmvscsi_reenable_crq_queue(struct crq_queue *queue, 107 struct ibmvscsi_host_data *hostdata); 108 109 void ibmvscsi_handle_crq(struct viosrp_crq *crq, 110 struct ibmvscsi_host_data *hostdata); 111 int ibmvscsi_send_crq(struct ibmvscsi_host_data *hostdata, 112 u64 word1, u64 word2); 113 114 #endif /* IBMVSCSI_H */ 115