summaryrefslogtreecommitdiffstats
path: root/drivers/scsi/ibmvscsi/iseries_vscsi.c
blob: 0775fdee5fa80cc4f9609167c8fc2e1769596d30 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
/* ------------------------------------------------------------
 * iSeries_vscsi.c
 * (C) Copyright IBM Corporation 1994, 2003
 * Authors: Colin DeVilbiss (devilbis@us.ibm.com)
 *          Santiago Leon (santil@us.ibm.com)
 *          Dave Boutcher (sleddog@us.ibm.com)
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
 * USA
 *
 * ------------------------------------------------------------
 * iSeries-specific functions of the SCSI host adapter for Virtual I/O devices
 *
 * This driver allows the Linux SCSI peripheral drivers to directly
 * access devices in the hosting partition, either on an iSeries
 * hypervisor system or a converged hypervisor system.
 */

#include <asm/iseries/vio.h>
#include <asm/iseries/hv_lp_event.h>
#include <asm/iseries/hv_types.h>
#include <asm/iseries/hv_lp_config.h>
#include <asm/vio.h>
#include <linux/device.h>
#include "ibmvscsi.h"

/* global variables */
static struct ibmvscsi_host_data *single_host_data;

/* ------------------------------------------------------------
 * Routines for direct interpartition interaction
 */
struct srp_lp_event {
	struct HvLpEvent lpevt;	/* 0x00-0x17          */
	u32 reserved1;		/* 0x18-0x1B; unused  */
	u16 version;		/* 0x1C-0x1D; unused  */
	u16 subtype_rc;		/* 0x1E-0x1F; unused  */
	struct viosrp_crq crq;	/* 0x20-0x3F          */
};

/** 
 * standard interface for handling logical partition events.
 */
static void iseriesvscsi_handle_event(struct HvLpEvent *lpevt)
{
	struct srp_lp_event *evt = (struct srp_lp_event *)lpevt;

	if (!evt) {
		printk(KERN_ERR "ibmvscsi: received null event\n");
		return;
	}

	if (single_host_data == NULL) {
		printk(KERN_ERR
		       "ibmvscsi: received event, no adapter present\n");
		return;
	}

	ibmvscsi_handle_crq(&evt->crq, single_host_data);
}

/* ------------------------------------------------------------
 * Routines for driver initialization
 */
static int iseriesvscsi_init_crq_queue(struct crq_queue *queue,
				       struct ibmvscsi_host_data *hostdata,
				       int max_requests)
{
	int rc;

	single_host_data = hostdata;
	rc = viopath_open(viopath_hostLp, viomajorsubtype_scsi, max_requests);
	if (rc < 0) {
		printk("viopath_open failed with rc %d in open_event_path\n",
		       rc);
		goto viopath_open_failed;
	}

	rc = vio_setHandler(viomajorsubtype_scsi, iseriesvscsi_handle_event);
	if (rc < 0) {
		printk("vio_setHandler failed with rc %d in open_event_path\n",
		       rc);
		goto vio_setHandler_failed;
	}
	return 0;

      vio_setHandler_failed:
	viopath_close(viopath_hostLp, viomajorsubtype_scsi, max_requests);
      viopath_open_failed:
	return -1;
}

static void iseriesvscsi_release_crq_queue(struct crq_queue *queue,
					   struct ibmvscsi_host_data *hostdata,
					   int max_requests)
{
	vio_clearHandler(viomajorsubtype_scsi);
	viopath_close(viopath_hostLp, viomajorsubtype_scsi, max_requests);
}

/**
 * reset_crq_queue: - resets a crq after a failure
 * @queue:	crq_queue to initialize and register
 * @hostdata:	ibmvscsi_host_data of host
 *
 * no-op for iSeries
 */
static int iseriesvscsi_reset_crq_queue(struct crq_queue *queue,
					struct ibmvscsi_host_data *hostdata)
{
	return 0;
}

/**
 * reenable_crq_queue: - reenables a crq after a failure
 * @queue:	crq_queue to initialize and register
 * @hostdata:	ibmvscsi_host_data of host
 *
 * no-op for iSeries
 */
static int iseriesvscsi_reenable_crq_queue(struct crq_queue *queue,
					   struct ibmvscsi_host_data *hostdata)
{
	return 0;
}

/**
 * iseriesvscsi_send_crq: - Send a CRQ
 * @hostdata:	the adapter
 * @word1:	the first 64 bits of the data
 * @word2:	the second 64 bits of the data
 */
static int iseriesvscsi_send_crq(struct ibmvscsi_host_data *hostdata,
				 u64 word1, u64 word2)
{
	single_host_data = hostdata;
	return HvCallEvent_signalLpEventFast(viopath_hostLp,
					     HvLpEvent_Type_VirtualIo,
					     viomajorsubtype_scsi,
					     HvLpEvent_AckInd_NoAck,
					     HvLpEvent_AckType_ImmediateAck,
					     viopath_sourceinst(viopath_hostLp),
					     viopath_targetinst(viopath_hostLp),
					     0,
					     VIOVERSION << 16, word1, word2, 0,
					     0);
}

struct ibmvscsi_ops iseriesvscsi_ops = {
	.init_crq_queue = iseriesvscsi_init_crq_queue,
	.release_crq_queue = iseriesvscsi_release_crq_queue,
	.reset_crq_queue = iseriesvscsi_reset_crq_queue,
	.reenable_crq_queue = iseriesvscsi_reenable_crq_queue,
	.send_crq = iseriesvscsi_send_crq,
};
OpenPOWER on IntegriCloud