1 /* ------------------------------------------------------------
2 * iSeries_vscsi.c
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 * iSeries-specific functions of the 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
31 #include <asm/iseries/vio.h>
32 #include <asm/iseries/hv_lp_event.h>
33 #include <asm/iseries/hv_types.h>
34 #include <asm/iseries/hv_lp_config.h>
35 #include <asm/vio.h>
36 #include <linux/device.h>
37 #include "ibmvscsi.h"
38
39 /* global variables */
40 static struct ibmvscsi_host_data *single_host_data;
41
42 /* ------------------------------------------------------------
43 * Routines for direct interpartition interaction
44 */
45 struct srp_lp_event {
46 struct HvLpEvent lpevt; /* 0x00-0x17 */
47 u32 reserved1; /* 0x18-0x1B; unused */
48 u16 version; /* 0x1C-0x1D; unused */
49 u16 subtype_rc; /* 0x1E-0x1F; unused */
50 struct viosrp_crq crq; /* 0x20-0x3F */
51 };
52
53 /**
54 * standard interface for handling logical partition events.
55 */
iseriesvscsi_handle_event(struct HvLpEvent * lpevt)56 static void iseriesvscsi_handle_event(struct HvLpEvent *lpevt)
57 {
58 struct srp_lp_event *evt = (struct srp_lp_event *)lpevt;
59
60 if (!evt) {
61 printk(KERN_ERR "ibmvscsi: received null event\n");
62 return;
63 }
64
65 if (single_host_data == NULL) {
66 printk(KERN_ERR
67 "ibmvscsi: received event, no adapter present\n");
68 return;
69 }
70
71 ibmvscsi_handle_crq(&evt->crq, single_host_data);
72 }
73
74 /* ------------------------------------------------------------
75 * Routines for driver initialization
76 */
iseriesvscsi_init_crq_queue(struct crq_queue * queue,struct ibmvscsi_host_data * hostdata,int max_requests)77 static int iseriesvscsi_init_crq_queue(struct crq_queue *queue,
78 struct ibmvscsi_host_data *hostdata,
79 int max_requests)
80 {
81 int rc;
82
83 single_host_data = hostdata;
84 rc = viopath_open(viopath_hostLp, viomajorsubtype_scsi, max_requests);
85 if (rc < 0) {
86 printk("viopath_open failed with rc %d in open_event_path\n",
87 rc);
88 goto viopath_open_failed;
89 }
90
91 rc = vio_setHandler(viomajorsubtype_scsi, iseriesvscsi_handle_event);
92 if (rc < 0) {
93 printk("vio_setHandler failed with rc %d in open_event_path\n",
94 rc);
95 goto vio_setHandler_failed;
96 }
97 return 0;
98
99 vio_setHandler_failed:
100 viopath_close(viopath_hostLp, viomajorsubtype_scsi, max_requests);
101 viopath_open_failed:
102 return -1;
103 }
104
iseriesvscsi_release_crq_queue(struct crq_queue * queue,struct ibmvscsi_host_data * hostdata,int max_requests)105 static void iseriesvscsi_release_crq_queue(struct crq_queue *queue,
106 struct ibmvscsi_host_data *hostdata,
107 int max_requests)
108 {
109 vio_clearHandler(viomajorsubtype_scsi);
110 viopath_close(viopath_hostLp, viomajorsubtype_scsi, max_requests);
111 }
112
113 /**
114 * reset_crq_queue: - resets a crq after a failure
115 * @queue: crq_queue to initialize and register
116 * @hostdata: ibmvscsi_host_data of host
117 *
118 * no-op for iSeries
119 */
iseriesvscsi_reset_crq_queue(struct crq_queue * queue,struct ibmvscsi_host_data * hostdata)120 static int iseriesvscsi_reset_crq_queue(struct crq_queue *queue,
121 struct ibmvscsi_host_data *hostdata)
122 {
123 return 0;
124 }
125
126 /**
127 * reenable_crq_queue: - reenables a crq after a failure
128 * @queue: crq_queue to initialize and register
129 * @hostdata: ibmvscsi_host_data of host
130 *
131 * no-op for iSeries
132 */
iseriesvscsi_reenable_crq_queue(struct crq_queue * queue,struct ibmvscsi_host_data * hostdata)133 static int iseriesvscsi_reenable_crq_queue(struct crq_queue *queue,
134 struct ibmvscsi_host_data *hostdata)
135 {
136 return 0;
137 }
138
139 /**
140 * iseriesvscsi_send_crq: - Send a CRQ
141 * @hostdata: the adapter
142 * @word1: the first 64 bits of the data
143 * @word2: the second 64 bits of the data
144 */
iseriesvscsi_send_crq(struct ibmvscsi_host_data * hostdata,u64 word1,u64 word2)145 static int iseriesvscsi_send_crq(struct ibmvscsi_host_data *hostdata,
146 u64 word1, u64 word2)
147 {
148 single_host_data = hostdata;
149 return HvCallEvent_signalLpEventFast(viopath_hostLp,
150 HvLpEvent_Type_VirtualIo,
151 viomajorsubtype_scsi,
152 HvLpEvent_AckInd_NoAck,
153 HvLpEvent_AckType_ImmediateAck,
154 viopath_sourceinst(viopath_hostLp),
155 viopath_targetinst(viopath_hostLp),
156 0,
157 VIOVERSION << 16, word1, word2, 0,
158 0);
159 }
160
iseriesvscsi_resume(struct ibmvscsi_host_data * hostdata)161 static int iseriesvscsi_resume(struct ibmvscsi_host_data *hostdata)
162 {
163 return 0;
164 }
165
166 struct ibmvscsi_ops iseriesvscsi_ops = {
167 .init_crq_queue = iseriesvscsi_init_crq_queue,
168 .release_crq_queue = iseriesvscsi_release_crq_queue,
169 .reset_crq_queue = iseriesvscsi_reset_crq_queue,
170 .reenable_crq_queue = iseriesvscsi_reenable_crq_queue,
171 .send_crq = iseriesvscsi_send_crq,
172 .resume = iseriesvscsi_resume,
173 };
174