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Diffstat (limited to '')
| -rw-r--r-- | drivers/scsi/cxlflash/superpipe.h | 157 |
1 files changed, 157 insertions, 0 deletions
diff --git a/drivers/scsi/cxlflash/superpipe.h b/drivers/scsi/cxlflash/superpipe.h new file mode 100644 index 000000000..35c3cbf83 --- /dev/null +++ b/drivers/scsi/cxlflash/superpipe.h @@ -0,0 +1,157 @@ +/* + * 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 CMD_TIMEOUT 30 /* 30 secs */ +#define CMD_RETRIES 5 /* 5 retries for scsi_execute */ + +#define MAX_SECTOR_UNIT 512 /* max_sector is in 512 byte multiples */ + +enum lun_mode { + MODE_NONE = 0, + MODE_VIRTUAL, + 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, VIRTUAL, PHYSICAL */ + int users; /* Number of users w/ references to LUN */ + + u8 wwid[16]; + + struct mutex mutex; + + struct blka blka; + struct list_head list; +}; + +/* Local (per-adapter) lun_info structure */ +struct llun_info { + u64 lun_id[MAX_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 in_table; /* Whether a LUN table entry was created */ + + 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) & 0xFFFFFFFF0ULL) << 28) | _id) +#define DECODE_CTXID(_val) (_val & 0xFFFFFFFF) + +struct ctx_info { + struct sisl_ctrl_map __iomem *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 */ + u8 *rht_needs_ws; /* User-desired write-same function per RHTE */ + + u64 ctxid; + u64 irqs; /* Number of interrupts requested for context */ + pid_t pid; + bool initialized; + bool unavail; + bool err_recovery_active; + struct mutex mutex; /* Context protection */ + struct kref kref; + void *ctx; + struct cxlflash_cfg *cfg; + 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_vlun_resize(struct scsi_device *sdev, + struct dk_cxlflash_resize *resize); +int _cxlflash_vlun_resize(struct scsi_device *sdev, struct ctx_info *ctxi, + struct dk_cxlflash_resize *resize); + +int cxlflash_disk_release(struct scsi_device *sdev, + struct dk_cxlflash_release *release); +int _cxlflash_disk_release(struct scsi_device *sdev, struct ctx_info *ctxi, + struct dk_cxlflash_release *release); + +int cxlflash_disk_clone(struct scsi_device *sdev, + struct dk_cxlflash_clone *clone); + +int cxlflash_disk_virtual_open(struct scsi_device *sdev, void *arg); + +int cxlflash_lun_attach(struct glun_info *gli, enum lun_mode mode, bool locked); +void cxlflash_lun_detach(struct glun_info *gli); + +struct ctx_info *get_context(struct cxlflash_cfg *cfg, u64 rctxit, void *arg, + enum ctx_ctrl ctrl); +void put_context(struct ctx_info *ctxi); + +struct sisl_rht_entry *get_rhte(struct ctx_info *ctxi, res_hndl_t rhndl, + struct llun_info *lli); + +struct sisl_rht_entry *rhte_checkout(struct ctx_info *ctxi, + struct llun_info *lli); +void rhte_checkin(struct ctx_info *ctxi, struct sisl_rht_entry *rhte); + +void cxlflash_ba_terminate(struct ba_lun *ba_lun); + +int cxlflash_manage_lun(struct scsi_device *sdev, + struct dk_cxlflash_manage_lun *manage); + +int check_state(struct cxlflash_cfg *cfg); + +#endif /* ifndef _CXLFLASH_SUPERPIPE_H */ |