1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 /* ------------------------------------------------------------ 3 * ibmvscsi.h 4 * (C) Copyright IBM Corporation 1994, 2003 5 * 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 devices 11 * 12 * This driver allows the Linux SCSI peripheral drivers to directly 13 * access devices in the hosting partition, either on an iSeries 14 * hypervisor system or a converged hypervisor system. 15 */ 16 #ifndef IBMVSCSI_H 17 #define IBMVSCSI_H 18 #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 24 struct scsi_cmnd; 25 struct Scsi_Host; 26 27 /* Number of indirect bufs...the list of these has to fit in the 28 * additional data of the srp_cmd struct along with the indirect 29 * descriptor 30 */ 31 #define MAX_INDIRECT_BUFS 10 32 33 #define IBMVSCSI_MAX_REQUESTS_DEFAULT 100 34 #define IBMVSCSI_CMDS_PER_LUN_DEFAULT 16 35 #define IBMVSCSI_MAX_SECTORS_DEFAULT 256 /* 32 * 8 = default max I/O 32 pages */ 36 #define IBMVSCSI_MAX_CMDS_PER_LUN 64 37 #define IBMVSCSI_MAX_LUN 32 38 39 /* ------------------------------------------------------------ 40 * Data Structures 41 */ 42 /* an RPA command/response transport queue */ 43 struct 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 */ 51 struct 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 */ 69 struct 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 77 enum 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 */ 85 struct 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