forked from Minki/linux
bb58596f68
This makes ibmvscsi work correctly with the recent set of kexec patches that went in. This is based on work by Michael Ellerman, who chased this initially. He validated that it works during kexec. Handle kexec correctly in ibmvscsi. During kexec the adapter will not get cleaned up correctly, so we may need to reset it to make it sane again. Signed-off-by: Dave Boutcher <sleddog@us.ibm.com> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
112 lines
3.4 KiB
C
112 lines
3.4 KiB
C
/* ------------------------------------------------------------
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* ibmvscsi.h
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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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* Emulation of a 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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#ifndef IBMVSCSI_H
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#define IBMVSCSI_H
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#include <linux/types.h>
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#include <linux/list.h>
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#include <linux/completion.h>
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#include <linux/interrupt.h>
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#include "viosrp.h"
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struct scsi_cmnd;
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struct Scsi_Host;
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/* Number of indirect bufs...the list of these has to fit in the
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* additional data of the srp_cmd struct along with the indirect
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* descriptor
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*/
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#define MAX_INDIRECT_BUFS 10
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/* ------------------------------------------------------------
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* Data Structures
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*/
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/* an RPA command/response transport queue */
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struct crq_queue {
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struct viosrp_crq *msgs;
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int size, cur;
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dma_addr_t msg_token;
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spinlock_t lock;
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};
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/* a unit of work for the hosting partition */
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struct srp_event_struct {
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union viosrp_iu *xfer_iu;
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struct scsi_cmnd *cmnd;
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struct list_head list;
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void (*done) (struct srp_event_struct *);
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struct viosrp_crq crq;
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struct ibmvscsi_host_data *hostdata;
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atomic_t free;
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union viosrp_iu iu;
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void (*cmnd_done) (struct scsi_cmnd *);
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struct completion comp;
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union viosrp_iu *sync_srp;
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struct memory_descriptor *ext_list;
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dma_addr_t ext_list_token;
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};
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/* a pool of event structs for use */
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struct event_pool {
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struct srp_event_struct *events;
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u32 size;
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int next;
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union viosrp_iu *iu_storage;
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dma_addr_t iu_token;
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};
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/* all driver data associated with a host adapter */
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struct ibmvscsi_host_data {
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atomic_t request_limit;
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struct device *dev;
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struct event_pool pool;
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struct crq_queue queue;
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struct tasklet_struct srp_task;
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struct list_head sent;
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struct Scsi_Host *host;
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struct mad_adapter_info_data madapter_info;
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};
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/* routines for managing a command/response queue */
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int ibmvscsi_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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void ibmvscsi_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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int ibmvscsi_reset_crq_queue(struct crq_queue *queue,
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struct ibmvscsi_host_data *hostdata);
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void ibmvscsi_handle_crq(struct viosrp_crq *crq,
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struct ibmvscsi_host_data *hostdata);
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int ibmvscsi_send_crq(struct ibmvscsi_host_data *hostdata,
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u64 word1, u64 word2);
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#endif /* IBMVSCSI_H */
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