1 /* ------------------------------------------------------------
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)
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.
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.
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
23 * ------------------------------------------------------------
24 * Emulation of a SCSI host adapter for Virtual I/O devices
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.
32 #include <linux/types.h>
33 #include <linux/list.h>
34 #include <linux/completion.h>
35 #include <linux/interrupt.h>
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
45 #define MAX_INDIRECT_BUFS 10
47 /* ------------------------------------------------------------
50 /* an RPA command/response transport queue */
52 struct viosrp_crq *msgs;
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;
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;
75 /* a pool of event structs for use */
77 struct srp_event_struct *events;
80 union viosrp_iu *iu_storage;
84 /* all driver data associated with a host adapter */
85 struct ibmvscsi_host_data {
86 atomic_t request_limit;
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;
96 /* routines for managing a command/response queue */
97 int ibmvscsi_init_crq_queue(struct crq_queue *queue,
98 struct ibmvscsi_host_data *hostdata,
100 void ibmvscsi_release_crq_queue(struct crq_queue *queue,
101 struct ibmvscsi_host_data *hostdata,
103 int ibmvscsi_reset_crq_queue(struct crq_queue *queue,
104 struct ibmvscsi_host_data *hostdata);
106 int ibmvscsi_reenable_crq_queue(struct crq_queue *queue,
107 struct ibmvscsi_host_data *hostdata);
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);
114 #endif /* IBMVSCSI_H */