/* ------------------------------------------------------------ * 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; 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 */