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/*
* CXL Flash Device Driver
*
* Written by: Manoj N. Kumar <manoj@linux.vnet.ibm.com>, IBM Corporation
* Matthew R. Ochs <mrochs@linux.vnet.ibm.com>, IBM Corporation
*
* Copyright (C) 2015 IBM Corporation
*
* 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.
*/
#ifndef _CXLFLASH_SUPERPIPE_H
#define _CXLFLASH_SUPERPIPE_H
extern struct cxlflash_global global;
/*
* Terminology: use afu (and not adapter) to refer to the HW.
* Adapter is the entire slot and includes PSL out of which
* only the AFU is visible to user space.
*/
/* Chunk size parms: note sislite minimum chunk size is
0x10000 LBAs corresponding to a NMASK or 16.
*/
#define MC_CHUNK_SIZE (1 << MC_RHT_NMASK) /* in LBAs */
#define MC_DISCOVERY_TIMEOUT 5 /* 5 secs */
#define CHAN2PORT(_x) ((_x) + 1)
enum lun_mode {
MODE_NONE = 0,
MODE_PHYSICAL
};
/* Global (entire driver, spans adapters) lun_info structure */
struct glun_info {
u64 max_lba; /* from read cap(16) */
u32 blk_len; /* from read cap(16) */
enum lun_mode mode; /* NONE, PHYSICAL */
int users; /* Number of users w/ references to LUN */
u8 wwid[16];
struct mutex mutex;
struct list_head list;
};
/* Local (per-adapter) lun_info structure */
struct llun_info {
u64 lun_id[CXLFLASH_NUM_FC_PORTS]; /* from REPORT_LUNS */
u32 lun_index; /* Index in the LUN table */
u32 host_no; /* host_no from Scsi_host */
u32 port_sel; /* What port to use for this LUN */
bool newly_created; /* Whether the LUN was just discovered */
u8 wwid[16]; /* Keep a duplicate copy here? */
struct glun_info *parent; /* Pointer to entry in global LUN structure */
struct scsi_device *sdev;
struct list_head list;
};
struct lun_access {
struct llun_info *lli;
struct scsi_device *sdev;
struct list_head list;
};
enum ctx_ctrl {
CTX_CTRL_CLONE = (1 << 1),
CTX_CTRL_ERR = (1 << 2),
CTX_CTRL_ERR_FALLBACK = (1 << 3),
CTX_CTRL_NOPID = (1 << 4),
CTX_CTRL_FILE = (1 << 5)
};
#define ENCODE_CTXID(_ctx, _id) (((((u64)_ctx) & 0xFFFFFFFF0) << 28) | _id)
#define DECODE_CTXID(_val) (_val & 0xFFFFFFFF)
struct ctx_info {
struct sisl_ctrl_map *ctrl_map; /* initialized at startup */
struct sisl_rht_entry *rht_start; /* 1 page (req'd for alignment),
alloc/free on attach/detach */
u32 rht_out; /* Number of checked out RHT entries */
u32 rht_perms; /* User-defined permissions for RHT entries */
struct llun_info **rht_lun; /* Mapping of RHT entries to LUNs */
struct cxl_ioctl_start_work work;
u64 ctxid;
int lfd;
pid_t pid;
bool unavail;
bool err_recovery_active;
struct mutex mutex; /* Context protection */
struct cxl_context *ctx;
struct list_head luns; /* LUNs attached to this context */
const struct vm_operations_struct *cxl_mmap_vmops;
struct file *file;
struct list_head list; /* Link contexts in error recovery */
};
struct cxlflash_global {
struct mutex mutex;
struct list_head gluns;/* list of glun_info structs */
struct page *err_page; /* One page of all 0xF for error notification */
};
int cxlflash_disk_release(struct scsi_device *, struct dk_cxlflash_release *);
int _cxlflash_disk_release(struct scsi_device *, struct ctx_info *,
struct dk_cxlflash_release *);
int cxlflash_lun_attach(struct glun_info *, enum lun_mode, bool);
void cxlflash_lun_detach(struct glun_info *);
struct ctx_info *get_context(struct cxlflash_cfg *, u64, void *, enum ctx_ctrl);
void put_context(struct ctx_info *);
struct sisl_rht_entry *get_rhte(struct ctx_info *, res_hndl_t,
struct llun_info *);
struct sisl_rht_entry *rhte_checkout(struct ctx_info *, struct llun_info *);
void rhte_checkin(struct ctx_info *, struct sisl_rht_entry *);
int cxlflash_manage_lun(struct scsi_device *, struct dk_cxlflash_manage_lun *);
#endif /* ifndef _CXLFLASH_SUPERPIPE_H */
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