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Diffstat (limited to 'drivers/scsi/ibmvscsi/ibmvscsi.h')
| -rw-r--r-- | drivers/scsi/ibmvscsi/ibmvscsi.h | 109 |
1 files changed, 109 insertions, 0 deletions
diff --git a/drivers/scsi/ibmvscsi/ibmvscsi.h b/drivers/scsi/ibmvscsi/ibmvscsi.h new file mode 100644 index 00000000000..1030b703c30 --- /dev/null +++ b/drivers/scsi/ibmvscsi/ibmvscsi.h @@ -0,0 +1,109 @@ +/* ------------------------------------------------------------ + * 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 + +/* ------------------------------------------------------------ + * 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; +}; + +/* 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); +void ibmvscsi_reset_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 */ |