| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame^] | 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 | } |