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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/HvLpEvent.h> | |
33 | #include <asm/iSeries/HvTypes.h> | |
34 | #include <asm/iSeries/HvLpConfig.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 | */ | |
56 | static void ibmvscsi_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 | */ | |
77 | int ibmvscsi_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, 0); | |
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, ibmvscsi_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 | ||
105 | void ibmvscsi_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 | */ | |
120 | void ibmvscsi_reset_crq_queue(struct crq_queue *queue, | |
121 | struct ibmvscsi_host_data *hostdata) | |
122 | { | |
123 | } | |
124 | ||
125 | /** | |
126 | * ibmvscsi_send_crq: - Send a CRQ | |
127 | * @hostdata: the adapter | |
128 | * @word1: the first 64 bits of the data | |
129 | * @word2: the second 64 bits of the data | |
130 | */ | |
131 | int ibmvscsi_send_crq(struct ibmvscsi_host_data *hostdata, u64 word1, u64 word2) | |
132 | { | |
133 | single_host_data = hostdata; | |
134 | return HvCallEvent_signalLpEventFast(viopath_hostLp, | |
135 | HvLpEvent_Type_VirtualIo, | |
136 | viomajorsubtype_scsi, | |
137 | HvLpEvent_AckInd_NoAck, | |
138 | HvLpEvent_AckType_ImmediateAck, | |
139 | viopath_sourceinst(viopath_hostLp), | |
140 | viopath_targetinst(viopath_hostLp), | |
141 | 0, | |
142 | VIOVERSION << 16, word1, word2, 0, | |
143 | 0); | |
144 | } |