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 */ 40static struct ibmvscsi_host_data *single_host_data; 41 42/* ------------------------------------------------------------ 43 * Routines for direct interpartition interaction 44 */ 45struct 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 */ 56static 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 */ 77int 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, 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, 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 105void 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 */ 120int ibmvscsi_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 */ 133int ibmvscsi_reenable_crq_queue(struct crq_queue *queue, 134 struct ibmvscsi_host_data *hostdata) 135{ 136 return 0; 137} 138 139/** 140 * ibmvscsi_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 */ 145int ibmvscsi_send_crq(struct ibmvscsi_host_data *hostdata, u64 word1, u64 word2) 146{ 147 single_host_data = hostdata; 148 return HvCallEvent_signalLpEventFast(viopath_hostLp, 149 HvLpEvent_Type_VirtualIo, 150 viomajorsubtype_scsi, 151 HvLpEvent_AckInd_NoAck, 152 HvLpEvent_AckType_ImmediateAck, 153 viopath_sourceinst(viopath_hostLp), 154 viopath_targetinst(viopath_hostLp), 155 0, 156 VIOVERSION << 16, word1, word2, 0, 157 0); 158} 159