/* * CXL Flash Device Driver * * Written by: Manoj N. Kumar , IBM Corporation * Matthew R. Ochs , 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_COMMON_H #define _CXLFLASH_COMMON_H #include #include #include #include #include #include extern const struct file_operations cxlflash_cxl_fops; #define MAX_CONTEXT CXLFLASH_MAX_CONTEXT /* num contexts per afu */ #define CXLFLASH_BLOCK_SIZE 4096 /* 4K blocks */ #define CXLFLASH_MAX_XFER_SIZE 16777216 /* 16MB transfer */ #define CXLFLASH_MAX_SECTORS (CXLFLASH_MAX_XFER_SIZE/512) /* SCSI wants max_sectors in units of 512 byte sectors */ #define MAX_RHT_PER_CONTEXT (PAGE_SIZE / sizeof(struct sisl_rht_entry)) /* AFU command retry limit */ #define MC_RETRY_CNT 5 /* sufficient for SCSI check and certain AFU errors */ /* Command management definitions */ #define CXLFLASH_NUM_CMDS (2 * CXLFLASH_MAX_CMDS) /* Must be a pow2 for alignment and more efficient array index derivation */ #define CXLFLASH_MAX_CMDS 256 #define CXLFLASH_MAX_CMDS_PER_LUN CXLFLASH_MAX_CMDS /* RRQ for master issued cmds */ #define NUM_RRQ_ENTRY CXLFLASH_MAX_CMDS static inline void check_sizes(void) { BUILD_BUG_ON_NOT_POWER_OF_2(CXLFLASH_NUM_CMDS); } /* AFU defines a fixed size of 4K for command buffers (borrow 4K page define) */ #define CMD_BUFSIZE SIZE_4K /* flags in IOA status area for host use */ #define B_DONE 0x01 #define B_ERROR 0x02 /* set with B_DONE */ #define B_TIMEOUT 0x04 /* set with B_DONE & B_ERROR */ enum cxlflash_lr_state { LINK_RESET_INVALID, LINK_RESET_REQUIRED, LINK_RESET_COMPLETE }; enum cxlflash_init_state { INIT_STATE_NONE, INIT_STATE_PCI, INIT_STATE_AFU, INIT_STATE_SCSI }; enum cxlflash_state { STATE_NORMAL, /* Normal running state, everything good */ STATE_RESET, /* Reset state, trying to reset/recover */ STATE_FAILTERM /* Failed/terminating state, error out users/threads */ }; /* * Each context has its own set of resource handles that is visible * only from that context. */ struct cxlflash_cfg { struct afu *afu; struct cxl_context *mcctx; struct pci_dev *dev; struct pci_device_id *dev_id; struct Scsi_Host *host; ulong cxlflash_regs_pci; struct work_struct work_q; enum cxlflash_init_state init_state; enum cxlflash_lr_state lr_state; int lr_port; atomic_t scan_host_needed; struct cxl_afu *cxl_afu; atomic_t recovery_threads; struct mutex ctx_recovery_mutex; struct mutex ctx_tbl_list_mutex; struct rw_semaphore ioctl_rwsem; struct ctx_info *ctx_tbl[MAX_CONTEXT]; struct list_head ctx_err_recovery; /* contexts w/ recovery pending */ struct file_operations cxl_fops; /* Parameters that are LUN table related */ int last_lun_index[CXLFLASH_NUM_FC_PORTS]; int promote_lun_index; struct list_head lluns; /* list of llun_info structs */ wait_queue_head_t tmf_waitq; spinlock_t tmf_slock; bool tmf_active; wait_queue_head_t reset_waitq; enum cxlflash_state state; }; struct afu_cmd { struct sisl_ioarcb rcb; /* IOARCB (cache line aligned) */ struct sisl_ioasa sa; /* IOASA must follow IOARCB */ spinlock_t slock; struct completion cevent; struct afu *parent; u8 cmd_tmf:1; /* As per the SISLITE spec the IOARCB EA has to be 16-byte aligned. * However for performance reasons the IOARCB/IOASA should be * cache line aligned. */ } __aligned(cache_line_size()); static inline struct afu_cmd *sc_to_afuc(struct scsi_cmnd *sc) { return PTR_ALIGN(scsi_cmd_priv(sc), __alignof__(struct afu_cmd)); } static inline struct afu_cmd *sc_to_afucz(struct scsi_cmnd *sc) { struct afu_cmd *afuc = sc_to_afuc(sc); memset(afuc, 0, sizeof(*afuc)); return afuc; } struct afu { /* Stuff requiring alignment go first. */ u64 rrq_entry[NUM_RRQ_ENTRY]; /* 2K RRQ */ /* Beware of alignment till here. Preferably introduce new * fields after this point */ /* AFU HW */ struct cxl_ioctl_start_work work; struct cxlflash_afu_map __iomem *afu_map; /* entire MMIO map */ struct sisl_host_map __iomem *host_map; /* MC host map */ struct sisl_ctrl_map __iomem *ctrl_map; /* MC control map */ struct kref mapcount; ctx_hndl_t ctx_hndl; /* master's context handle */ u64 *hrrq_start; u64 *hrrq_end; u64 *hrrq_curr; bool toggle; atomic_t cmds_active; /* Number of currently active AFU commands */ s64 room; spinlock_t rrin_slock; /* Lock to rrin queuing and cmd_room updates */ u64 hb; u32 internal_lun; /* User-desired LUN mode for this AFU */ char version[16]; u64 interface_version; struct cxlflash_cfg *parent; /* Pointer back to parent cxlflash_cfg */ }; static inline u64 lun_to_lunid(u64 lun) { __be64 lun_id; int_to_scsilun(lun, (struct scsi_lun *)&lun_id); return be64_to_cpu(lun_id); } int cxlflash_afu_sync(struct afu *, ctx_hndl_t, res_hndl_t, u8); void cxlflash_list_init(void); void cxlflash_term_global_luns(void); void cxlflash_free_errpage(void); int cxlflash_ioctl(struct scsi_device *, int, void __user *); void cxlflash_stop_term_user_contexts(struct cxlflash_cfg *); int cxlflash_mark_contexts_error(struct cxlflash_cfg *); void cxlflash_term_local_luns(struct cxlflash_cfg *); void cxlflash_restore_luntable(struct cxlflash_cfg *); #endif /* ifndef _CXLFLASH_COMMON_H */