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