117 lines
3.5 KiB
C
117 lines
3.5 KiB
C
/* ------------------------------------------------------------
|
|
* ibmvscsi.h
|
|
* (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
|
|
*
|
|
* ------------------------------------------------------------
|
|
* Emulation of a 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.
|
|
*/
|
|
#ifndef IBMVSCSI_H
|
|
#define IBMVSCSI_H
|
|
#include <linux/types.h>
|
|
#include <linux/list.h>
|
|
#include <linux/completion.h>
|
|
#include <linux/interrupt.h>
|
|
#include "viosrp.h"
|
|
|
|
struct scsi_cmnd;
|
|
struct Scsi_Host;
|
|
|
|
/* Number of indirect bufs...the list of these has to fit in the
|
|
* additional data of the srp_cmd struct along with the indirect
|
|
* descriptor
|
|
*/
|
|
#define MAX_INDIRECT_BUFS 10
|
|
|
|
#define IBMVSCSI_MAX_REQUESTS_DEFAULT 100
|
|
|
|
/* ------------------------------------------------------------
|
|
* Data Structures
|
|
*/
|
|
/* an RPA command/response transport queue */
|
|
struct crq_queue {
|
|
struct viosrp_crq *msgs;
|
|
int size, cur;
|
|
dma_addr_t msg_token;
|
|
spinlock_t lock;
|
|
};
|
|
|
|
/* a unit of work for the hosting partition */
|
|
struct srp_event_struct {
|
|
union viosrp_iu *xfer_iu;
|
|
struct scsi_cmnd *cmnd;
|
|
struct list_head list;
|
|
void (*done) (struct srp_event_struct *);
|
|
struct viosrp_crq crq;
|
|
struct ibmvscsi_host_data *hostdata;
|
|
atomic_t free;
|
|
union viosrp_iu iu;
|
|
void (*cmnd_done) (struct scsi_cmnd *);
|
|
struct completion comp;
|
|
union viosrp_iu *sync_srp;
|
|
struct srp_direct_buf *ext_list;
|
|
dma_addr_t ext_list_token;
|
|
};
|
|
|
|
/* a pool of event structs for use */
|
|
struct event_pool {
|
|
struct srp_event_struct *events;
|
|
u32 size;
|
|
int next;
|
|
union viosrp_iu *iu_storage;
|
|
dma_addr_t iu_token;
|
|
};
|
|
|
|
/* all driver data associated with a host adapter */
|
|
struct ibmvscsi_host_data {
|
|
atomic_t request_limit;
|
|
struct device *dev;
|
|
struct event_pool pool;
|
|
struct crq_queue queue;
|
|
struct tasklet_struct srp_task;
|
|
struct list_head sent;
|
|
struct Scsi_Host *host;
|
|
struct mad_adapter_info_data madapter_info;
|
|
};
|
|
|
|
/* routines for managing a command/response queue */
|
|
int ibmvscsi_init_crq_queue(struct crq_queue *queue,
|
|
struct ibmvscsi_host_data *hostdata,
|
|
int max_requests);
|
|
void ibmvscsi_release_crq_queue(struct crq_queue *queue,
|
|
struct ibmvscsi_host_data *hostdata,
|
|
int max_requests);
|
|
int ibmvscsi_reset_crq_queue(struct crq_queue *queue,
|
|
struct ibmvscsi_host_data *hostdata);
|
|
|
|
int ibmvscsi_reenable_crq_queue(struct crq_queue *queue,
|
|
struct ibmvscsi_host_data *hostdata);
|
|
|
|
void ibmvscsi_handle_crq(struct viosrp_crq *crq,
|
|
struct ibmvscsi_host_data *hostdata);
|
|
int ibmvscsi_send_crq(struct ibmvscsi_host_data *hostdata,
|
|
u64 word1, u64 word2);
|
|
|
|
#endif /* IBMVSCSI_H */
|