drivers/scsi/ibmvscsi/ibmvscsi.h

   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 #define IBMVSCSI_MAX_REQUESTS_DEFAULT 100
  48
  49 /* ------------------------------------------------------------
  50  * Data Structures
  51  */
  52 /* an RPA command/response transport queue */
  53 struct crq_queue {
  54         struct viosrp_crq *msgs;
  55         int size, cur;
  56         dma_addr_t msg_token;
  57         spinlock_t lock;
  58 };
  59
  60 /* a unit of work for the hosting partition */
  61 struct srp_event_struct {
  62         union viosrp_iu *xfer_iu;
  63         struct scsi_cmnd *cmnd;
  64         struct list_head list;
  65         void (*done) (struct srp_event_struct *);
  66         struct viosrp_crq crq;
  67         struct ibmvscsi_host_data *hostdata;
  68         atomic_t free;
  69         union viosrp_iu iu;
  70         void (*cmnd_done) (struct scsi_cmnd *);
  71         struct completion comp;
  72         union viosrp_iu *sync_srp;
  73         struct srp_direct_buf *ext_list;
  74         dma_addr_t ext_list_token;
  75 };
  76
  77 /* a pool of event structs for use */
  78 struct event_pool {
  79         struct srp_event_struct *events;
  80         u32 size;
  81         int next;
  82         union viosrp_iu *iu_storage;
  83         dma_addr_t iu_token;
  84 };
  85
  86 /* all driver data associated with a host adapter */
  87 struct ibmvscsi_host_data {
  88         atomic_t request_limit;
  89         struct device *dev;
  90         struct event_pool pool;
  91         struct crq_queue queue;
  92         struct tasklet_struct srp_task;
  93         struct list_head sent;
  94         struct Scsi_Host *host;
  95         struct mad_adapter_info_data madapter_info;
  96 };
  97
  98 /* routines for managing a command/response queue */
  99 int ibmvscsi_init_crq_queue(struct crq_queue *queue,
 100                             struct ibmvscsi_host_data *hostdata,
 101                             int max_requests);
 102 void ibmvscsi_release_crq_queue(struct crq_queue *queue,
 103                                 struct ibmvscsi_host_data *hostdata,
 104                                 int max_requests);
 105 int ibmvscsi_reset_crq_queue(struct crq_queue *queue,
 106                               struct ibmvscsi_host_data *hostdata);
 107
 108 int ibmvscsi_reenable_crq_queue(struct crq_queue *queue,
 109                                 struct ibmvscsi_host_data *hostdata);
 110
 111 void ibmvscsi_handle_crq(struct viosrp_crq *crq,
 112                          struct ibmvscsi_host_data *hostdata);
 113 int ibmvscsi_send_crq(struct ibmvscsi_host_data *hostdata,
 114                       u64 word1, u64 word2);
 115
 116 #endif                          /* IBMVSCSI_H */