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1/* SPDX-License-Identifier: GPL-2.0-or-later */2/* ------------------------------------------------------------3 * ibmvscsi.h4 * (C) Copyright IBM Corporation 1994, 20035 * Authors: Colin DeVilbiss (devilbis@us.ibm.com)6 * Santiago Leon (santil@us.ibm.com)7 * Dave Boutcher (sleddog@us.ibm.com)8 *9 * ------------------------------------------------------------10 * Emulation of a SCSI host adapter for Virtual I/O devices11 *12 * This driver allows the Linux SCSI peripheral drivers to directly13 * access devices in the hosting partition, either on an iSeries14 * hypervisor system or a converged hypervisor system.15 */16#ifndef IBMVSCSI_H17#define IBMVSCSI_H18#include <linux/types.h>19#include <linux/list.h>20#include <linux/completion.h>21#include <linux/interrupt.h>22#include <scsi/viosrp.h>23 24struct scsi_cmnd;25struct Scsi_Host;26 27/* Number of indirect bufs...the list of these has to fit in the28 * additional data of the srp_cmd struct along with the indirect29 * descriptor30 */31#define MAX_INDIRECT_BUFS 1032 33#define IBMVSCSI_MAX_REQUESTS_DEFAULT 10034#define IBMVSCSI_CMDS_PER_LUN_DEFAULT 1635#define IBMVSCSI_MAX_SECTORS_DEFAULT 256 /* 32 * 8 = default max I/O 32 pages */36#define IBMVSCSI_MAX_CMDS_PER_LUN 6437#define IBMVSCSI_MAX_LUN 3238 39/* ------------------------------------------------------------40 * Data Structures41 */42/* an RPA command/response transport queue */43struct crq_queue {44 struct viosrp_crq *msgs;45 int size, cur;46 dma_addr_t msg_token;47 spinlock_t lock;48};49 50/* a unit of work for the hosting partition */51struct srp_event_struct {52 union viosrp_iu *xfer_iu;53 struct scsi_cmnd *cmnd;54 struct list_head list;55 void (*done) (struct srp_event_struct *);56 struct viosrp_crq crq;57 struct ibmvscsi_host_data *hostdata;58 atomic_t free;59 union viosrp_iu iu;60 void (*cmnd_done) (struct scsi_cmnd *);61 struct completion comp;62 struct timer_list timer;63 union viosrp_iu *sync_srp;64 struct srp_direct_buf *ext_list;65 dma_addr_t ext_list_token;66};67 68/* a pool of event structs for use */69struct event_pool {70 struct srp_event_struct *events;71 u32 size;72 int next;73 union viosrp_iu *iu_storage;74 dma_addr_t iu_token;75};76 77enum ibmvscsi_host_action {78 IBMVSCSI_HOST_ACTION_NONE = 0,79 IBMVSCSI_HOST_ACTION_RESET,80 IBMVSCSI_HOST_ACTION_REENABLE,81 IBMVSCSI_HOST_ACTION_UNBLOCK,82};83 84/* all driver data associated with a host adapter */85struct ibmvscsi_host_data {86 struct list_head host_list;87 atomic_t request_limit;88 int client_migrated;89 enum ibmvscsi_host_action action;90 struct device *dev;91 struct event_pool pool;92 struct crq_queue queue;93 struct tasklet_struct srp_task;94 struct list_head sent;95 struct Scsi_Host *host;96 struct task_struct *work_thread;97 wait_queue_head_t work_wait_q;98 struct mad_adapter_info_data madapter_info;99 struct capabilities caps;100 dma_addr_t caps_addr;101 dma_addr_t adapter_info_addr;102};103 104#endif /* IBMVSCSI_H */105