drivers/scsi/cxlflash/superpipe.h

   1 /*
   2  * CXL Flash Device Driver
   3  *
   4  * Written by: Manoj N. Kumar <manoj@linux.vnet.ibm.com>, IBM Corporation
   5  *             Matthew R. Ochs <mrochs@linux.vnet.ibm.com>, IBM Corporation
   6  *
   7  * Copyright (C) 2015 IBM Corporation
   8  *
   9  * This program is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU General Public License
  11  * as published by the Free Software Foundation; either version
  12  * 2 of the License, or (at your option) any later version.
  13  */
  14
  15 #ifndef _CXLFLASH_SUPERPIPE_H
  16 #define _CXLFLASH_SUPERPIPE_H
  17
  18 extern struct cxlflash_global global;
  19
  20 /*
  21  * Terminology: use afu (and not adapter) to refer to the HW.
  22  * Adapter is the entire slot and includes PSL out of which
  23  * only the AFU is visible to user space.
  24  */
  25
  26 /* Chunk size parms: note sislite minimum chunk size is
  27    0x10000 LBAs corresponding to a NMASK or 16.
  28 */
  29 #define MC_CHUNK_SIZE     (1 << MC_RHT_NMASK)   /* in LBAs */
  30
  31 #define CMD_TIMEOUT 30  /* 30 secs */
  32 #define CMD_RETRIES 5   /* 5 retries for scsi_execute */
  33
  34 #define MAX_SECTOR_UNIT  512 /* max_sector is in 512 byte multiples */
  35
  36 #define CHAN2PORT(_x)   ((_x) + 1)
  37 #define PORT2CHAN(_x)   ((_x) - 1)
  38
  39 enum lun_mode {
  40         MODE_NONE = 0,
  41         MODE_VIRTUAL,
  42         MODE_PHYSICAL
  43 };
  44
  45 /* Global (entire driver, spans adapters) lun_info structure */
  46 struct glun_info {
  47         u64 max_lba;            /* from read cap(16) */
  48         u32 blk_len;            /* from read cap(16) */
  49         enum lun_mode mode;     /* NONE, VIRTUAL, PHYSICAL */
  50         int users;              /* Number of users w/ references to LUN */
  51
  52         u8 wwid[16];
  53
  54         struct mutex mutex;
  55
  56         struct blka blka;
  57         struct list_head list;
  58 };
  59
  60 /* Local (per-adapter) lun_info structure */
  61 struct llun_info {
  62         u64 lun_id[CXLFLASH_NUM_FC_PORTS]; /* from REPORT_LUNS */
  63         u32 lun_index;          /* Index in the LUN table */
  64         u32 host_no;            /* host_no from Scsi_host */
  65         u32 port_sel;           /* What port to use for this LUN */
  66         bool in_table;          /* Whether a LUN table entry was created */
  67
  68         u8 wwid[16];            /* Keep a duplicate copy here? */
  69
  70         struct glun_info *parent; /* Pointer to entry in global LUN structure */
  71         struct scsi_device *sdev;
  72         struct list_head list;
  73 };
  74
  75 struct lun_access {
  76         struct llun_info *lli;
  77         struct scsi_device *sdev;
  78         struct list_head list;
  79 };
  80
  81 enum ctx_ctrl {
  82         CTX_CTRL_CLONE          = (1 << 1),
  83         CTX_CTRL_ERR            = (1 << 2),
  84         CTX_CTRL_ERR_FALLBACK   = (1 << 3),
  85         CTX_CTRL_NOPID          = (1 << 4),
  86         CTX_CTRL_FILE           = (1 << 5)
  87 };
  88
  89 #define ENCODE_CTXID(_ctx, _id) (((((u64)_ctx) & 0xFFFFFFFF0ULL) << 28) | _id)
  90 #define DECODE_CTXID(_val)      (_val & 0xFFFFFFFF)
  91
  92 struct ctx_info {
  93         struct sisl_ctrl_map __iomem *ctrl_map; /* initialized at startup */
  94         struct sisl_rht_entry *rht_start; /* 1 page (req'd for alignment),
  95                                              alloc/free on attach/detach */
  96         u32 rht_out;            /* Number of checked out RHT entries */
  97         u32 rht_perms;          /* User-defined permissions for RHT entries */
  98         struct llun_info **rht_lun;       /* Mapping of RHT entries to LUNs */
  99         u8 *rht_needs_ws;       /* User-desired write-same function per RHTE */
 100
 101         struct cxl_ioctl_start_work work;
 102         u64 ctxid;
 103         pid_t pid;
 104         bool initialized;
 105         bool unavail;
 106         bool err_recovery_active;
 107         struct mutex mutex; /* Context protection */
 108         struct kref kref;
 109         struct cxl_context *ctx;
 110         struct cxlflash_cfg *cfg;
 111         struct list_head luns;  /* LUNs attached to this context */
 112         const struct vm_operations_struct *cxl_mmap_vmops;
 113         struct file *file;
 114         struct list_head list; /* Link contexts in error recovery */
 115 };
 116
 117 struct cxlflash_global {
 118         struct mutex mutex;
 119         struct list_head gluns;/* list of glun_info structs */
 120         struct page *err_page; /* One page of all 0xF for error notification */
 121 };
 122
 123 int cxlflash_vlun_resize(struct scsi_device *, struct dk_cxlflash_resize *);
 124 int _cxlflash_vlun_resize(struct scsi_device *, struct ctx_info *,
 125                           struct dk_cxlflash_resize *);
 126
 127 int cxlflash_disk_release(struct scsi_device *, struct dk_cxlflash_release *);
 128 int _cxlflash_disk_release(struct scsi_device *, struct ctx_info *,
 129                            struct dk_cxlflash_release *);
 130
 131 int cxlflash_disk_clone(struct scsi_device *, struct dk_cxlflash_clone *);
 132
 133 int cxlflash_disk_virtual_open(struct scsi_device *, void *);
 134
 135 int cxlflash_lun_attach(struct glun_info *, enum lun_mode, bool);
 136 void cxlflash_lun_detach(struct glun_info *);
 137
 138 struct ctx_info *get_context(struct cxlflash_cfg *, u64, void *, enum ctx_ctrl);
 139 void put_context(struct ctx_info *);
 140
 141 struct sisl_rht_entry *get_rhte(struct ctx_info *, res_hndl_t,
 142                                 struct llun_info *);
 143
 144 struct sisl_rht_entry *rhte_checkout(struct ctx_info *, struct llun_info *);
 145 void rhte_checkin(struct ctx_info *, struct sisl_rht_entry *);
 146
 147 void cxlflash_ba_terminate(struct ba_lun *);
 148
 149 int cxlflash_manage_lun(struct scsi_device *, struct dk_cxlflash_manage_lun *);
 150
 151 int check_state(struct cxlflash_cfg *);
 152
 153 #endif /* ifndef _CXLFLASH_SUPERPIPE_H */