154 lines
4.6 KiB
C
154 lines
4.6 KiB
C
/*
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* CXL Flash Device Driver
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*
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* Written by: Manoj N. Kumar <manoj@linux.vnet.ibm.com>, IBM Corporation
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* Matthew R. Ochs <mrochs@linux.vnet.ibm.com>, IBM Corporation
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*
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* Copyright (C) 2015 IBM Corporation
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#ifndef _CXLFLASH_SUPERPIPE_H
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#define _CXLFLASH_SUPERPIPE_H
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extern struct cxlflash_global global;
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/*
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* Terminology: use afu (and not adapter) to refer to the HW.
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* Adapter is the entire slot and includes PSL out of which
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* only the AFU is visible to user space.
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*/
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/* Chunk size parms: note sislite minimum chunk size is
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0x10000 LBAs corresponding to a NMASK or 16.
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*/
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#define MC_CHUNK_SIZE (1 << MC_RHT_NMASK) /* in LBAs */
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#define CMD_TIMEOUT 30 /* 30 secs */
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#define CMD_RETRIES 5 /* 5 retries for scsi_execute */
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#define MAX_SECTOR_UNIT 512 /* max_sector is in 512 byte multiples */
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#define CHAN2PORT(_x) ((_x) + 1)
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#define PORT2CHAN(_x) ((_x) - 1)
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enum lun_mode {
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MODE_NONE = 0,
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MODE_VIRTUAL,
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MODE_PHYSICAL
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};
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/* Global (entire driver, spans adapters) lun_info structure */
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struct glun_info {
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u64 max_lba; /* from read cap(16) */
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u32 blk_len; /* from read cap(16) */
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enum lun_mode mode; /* NONE, VIRTUAL, PHYSICAL */
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int users; /* Number of users w/ references to LUN */
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u8 wwid[16];
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struct mutex mutex;
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struct blka blka;
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struct list_head list;
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};
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/* Local (per-adapter) lun_info structure */
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struct llun_info {
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u64 lun_id[CXLFLASH_NUM_FC_PORTS]; /* from REPORT_LUNS */
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u32 lun_index; /* Index in the LUN table */
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u32 host_no; /* host_no from Scsi_host */
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u32 port_sel; /* What port to use for this LUN */
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bool in_table; /* Whether a LUN table entry was created */
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u8 wwid[16]; /* Keep a duplicate copy here? */
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struct glun_info *parent; /* Pointer to entry in global LUN structure */
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struct scsi_device *sdev;
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struct list_head list;
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};
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struct lun_access {
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struct llun_info *lli;
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struct scsi_device *sdev;
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struct list_head list;
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};
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enum ctx_ctrl {
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CTX_CTRL_CLONE = (1 << 1),
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CTX_CTRL_ERR = (1 << 2),
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CTX_CTRL_ERR_FALLBACK = (1 << 3),
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CTX_CTRL_NOPID = (1 << 4),
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CTX_CTRL_FILE = (1 << 5)
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};
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#define ENCODE_CTXID(_ctx, _id) (((((u64)_ctx) & 0xFFFFFFFF0ULL) << 28) | _id)
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#define DECODE_CTXID(_val) (_val & 0xFFFFFFFF)
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struct ctx_info {
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struct sisl_ctrl_map __iomem *ctrl_map; /* initialized at startup */
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struct sisl_rht_entry *rht_start; /* 1 page (req'd for alignment),
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alloc/free on attach/detach */
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u32 rht_out; /* Number of checked out RHT entries */
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u32 rht_perms; /* User-defined permissions for RHT entries */
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struct llun_info **rht_lun; /* Mapping of RHT entries to LUNs */
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u8 *rht_needs_ws; /* User-desired write-same function per RHTE */
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struct cxl_ioctl_start_work work;
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u64 ctxid;
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pid_t pid;
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bool initialized;
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bool unavail;
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bool err_recovery_active;
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struct mutex mutex; /* Context protection */
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struct kref kref;
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struct cxl_context *ctx;
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struct cxlflash_cfg *cfg;
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struct list_head luns; /* LUNs attached to this context */
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const struct vm_operations_struct *cxl_mmap_vmops;
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struct file *file;
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struct list_head list; /* Link contexts in error recovery */
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};
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struct cxlflash_global {
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struct mutex mutex;
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struct list_head gluns;/* list of glun_info structs */
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struct page *err_page; /* One page of all 0xF for error notification */
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};
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int cxlflash_vlun_resize(struct scsi_device *, struct dk_cxlflash_resize *);
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int _cxlflash_vlun_resize(struct scsi_device *, struct ctx_info *,
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struct dk_cxlflash_resize *);
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int cxlflash_disk_release(struct scsi_device *, struct dk_cxlflash_release *);
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int _cxlflash_disk_release(struct scsi_device *, struct ctx_info *,
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struct dk_cxlflash_release *);
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int cxlflash_disk_clone(struct scsi_device *, struct dk_cxlflash_clone *);
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int cxlflash_disk_virtual_open(struct scsi_device *, void *);
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int cxlflash_lun_attach(struct glun_info *, enum lun_mode, bool);
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void cxlflash_lun_detach(struct glun_info *);
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struct ctx_info *get_context(struct cxlflash_cfg *, u64, void *, enum ctx_ctrl);
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void put_context(struct ctx_info *);
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struct sisl_rht_entry *get_rhte(struct ctx_info *, res_hndl_t,
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struct llun_info *);
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struct sisl_rht_entry *rhte_checkout(struct ctx_info *, struct llun_info *);
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void rhte_checkin(struct ctx_info *, struct sisl_rht_entry *);
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void cxlflash_ba_terminate(struct ba_lun *);
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int cxlflash_manage_lun(struct scsi_device *, struct dk_cxlflash_manage_lun *);
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int check_state(struct cxlflash_cfg *);
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#endif /* ifndef _CXLFLASH_SUPERPIPE_H */
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