174 lines
5.1 KiB
C
174 lines
5.1 KiB
C
/* ------------------------------------------------------------
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* iSeries_vscsi.c
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* (C) Copyright IBM Corporation 1994, 2003
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* Authors: Colin DeVilbiss (devilbis@us.ibm.com)
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* Santiago Leon (santil@us.ibm.com)
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* Dave Boutcher (sleddog@us.ibm.com)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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* USA
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*
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* ------------------------------------------------------------
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* iSeries-specific functions of the SCSI host adapter for Virtual I/O devices
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*
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* This driver allows the Linux SCSI peripheral drivers to directly
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* access devices in the hosting partition, either on an iSeries
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* hypervisor system or a converged hypervisor system.
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*/
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#include <asm/iseries/vio.h>
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#include <asm/iseries/hv_lp_event.h>
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#include <asm/iseries/hv_types.h>
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#include <asm/iseries/hv_lp_config.h>
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#include <asm/vio.h>
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#include <linux/device.h>
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#include "ibmvscsi.h"
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/* global variables */
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static struct ibmvscsi_host_data *single_host_data;
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/* ------------------------------------------------------------
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* Routines for direct interpartition interaction
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*/
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struct srp_lp_event {
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struct HvLpEvent lpevt; /* 0x00-0x17 */
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u32 reserved1; /* 0x18-0x1B; unused */
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u16 version; /* 0x1C-0x1D; unused */
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u16 subtype_rc; /* 0x1E-0x1F; unused */
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struct viosrp_crq crq; /* 0x20-0x3F */
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};
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/**
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* standard interface for handling logical partition events.
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*/
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static void iseriesvscsi_handle_event(struct HvLpEvent *lpevt)
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{
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struct srp_lp_event *evt = (struct srp_lp_event *)lpevt;
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if (!evt) {
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printk(KERN_ERR "ibmvscsi: received null event\n");
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return;
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}
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if (single_host_data == NULL) {
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printk(KERN_ERR
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"ibmvscsi: received event, no adapter present\n");
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return;
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}
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ibmvscsi_handle_crq(&evt->crq, single_host_data);
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}
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/* ------------------------------------------------------------
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* Routines for driver initialization
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*/
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static int iseriesvscsi_init_crq_queue(struct crq_queue *queue,
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struct ibmvscsi_host_data *hostdata,
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int max_requests)
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{
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int rc;
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single_host_data = hostdata;
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rc = viopath_open(viopath_hostLp, viomajorsubtype_scsi, max_requests);
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if (rc < 0) {
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printk("viopath_open failed with rc %d in open_event_path\n",
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rc);
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goto viopath_open_failed;
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}
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rc = vio_setHandler(viomajorsubtype_scsi, iseriesvscsi_handle_event);
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if (rc < 0) {
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printk("vio_setHandler failed with rc %d in open_event_path\n",
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rc);
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goto vio_setHandler_failed;
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}
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return 0;
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vio_setHandler_failed:
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viopath_close(viopath_hostLp, viomajorsubtype_scsi, max_requests);
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viopath_open_failed:
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return -1;
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}
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static void iseriesvscsi_release_crq_queue(struct crq_queue *queue,
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struct ibmvscsi_host_data *hostdata,
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int max_requests)
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{
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vio_clearHandler(viomajorsubtype_scsi);
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viopath_close(viopath_hostLp, viomajorsubtype_scsi, max_requests);
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}
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/**
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* reset_crq_queue: - resets a crq after a failure
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* @queue: crq_queue to initialize and register
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* @hostdata: ibmvscsi_host_data of host
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*
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* no-op for iSeries
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*/
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static int iseriesvscsi_reset_crq_queue(struct crq_queue *queue,
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struct ibmvscsi_host_data *hostdata)
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{
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return 0;
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}
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/**
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* reenable_crq_queue: - reenables a crq after a failure
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* @queue: crq_queue to initialize and register
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* @hostdata: ibmvscsi_host_data of host
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*
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* no-op for iSeries
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*/
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static int iseriesvscsi_reenable_crq_queue(struct crq_queue *queue,
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struct ibmvscsi_host_data *hostdata)
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{
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return 0;
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}
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/**
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* iseriesvscsi_send_crq: - Send a CRQ
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* @hostdata: the adapter
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* @word1: the first 64 bits of the data
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* @word2: the second 64 bits of the data
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*/
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static int iseriesvscsi_send_crq(struct ibmvscsi_host_data *hostdata,
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u64 word1, u64 word2)
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{
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single_host_data = hostdata;
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return HvCallEvent_signalLpEventFast(viopath_hostLp,
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HvLpEvent_Type_VirtualIo,
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viomajorsubtype_scsi,
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HvLpEvent_AckInd_NoAck,
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HvLpEvent_AckType_ImmediateAck,
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viopath_sourceinst(viopath_hostLp),
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viopath_targetinst(viopath_hostLp),
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0,
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VIOVERSION << 16, word1, word2, 0,
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0);
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}
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static int iseriesvscsi_resume(struct ibmvscsi_host_data *hostdata)
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{
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return 0;
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}
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struct ibmvscsi_ops iseriesvscsi_ops = {
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.init_crq_queue = iseriesvscsi_init_crq_queue,
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.release_crq_queue = iseriesvscsi_release_crq_queue,
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.reset_crq_queue = iseriesvscsi_reset_crq_queue,
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.reenable_crq_queue = iseriesvscsi_reenable_crq_queue,
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.send_crq = iseriesvscsi_send_crq,
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.resume = iseriesvscsi_resume,
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};
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