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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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64355b929d
Adds support for resuming from suspend for IBM VSCSI devices. We may have lost an interrupt over the suspend, so we just kick the interrupt handler to process anything that is outstanding. We expect to find a transport event indicating we need to reestablish our CRQ. Signed-off-by: Brian King <brking@linux.vnet.ibm.com> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
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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