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126c5cc37e
Add support to ibmvscsi for the capabilities MAD. This command gets sent to the Virtual I/O server prior to login in order to communicate client capabilities. Additionally it returns information regarding capabilities that the server supports. The two main capabilities communicated in this MAD are related to partition migration and client reserve. Client reserve allows for SCSI-2 reservations to be sent to virtual disks which are backed by physical LUNs and will result in the reservation being sent to the physical LUN. Signed-off-by: Brian King <brking@linux.vnet.ibm.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
128 lines
3.9 KiB
C
128 lines
3.9 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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#define IBMVSCSI_MAX_REQUESTS_DEFAULT 100
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#define IBMVSCSI_CMDS_PER_LUN_DEFAULT 16
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#define IBMVSCSI_MAX_SECTORS_DEFAULT 256 /* 32 * 8 = default max I/O 32 pages */
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#define IBMVSCSI_MAX_CMDS_PER_LUN 64
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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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struct timer_list timer;
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union viosrp_iu *sync_srp;
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struct srp_direct_buf *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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int client_migrated;
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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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struct capabilities caps;
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dma_addr_t caps_addr;
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dma_addr_t adapter_info_addr;
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};
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/* routines for managing a command/response queue */
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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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struct ibmvscsi_ops {
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int (*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 (*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 (*reset_crq_queue)(struct crq_queue *queue,
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struct ibmvscsi_host_data *hostdata);
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int (*reenable_crq_queue)(struct crq_queue *queue,
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struct ibmvscsi_host_data *hostdata);
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int (*send_crq)(struct ibmvscsi_host_data *hostdata,
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u64 word1, u64 word2);
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};
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extern struct ibmvscsi_ops iseriesvscsi_ops;
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extern struct ibmvscsi_ops rpavscsi_ops;
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#endif /* IBMVSCSI_H */
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