--- /dev/null
+/*
+ * 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 */
+
+#define CHAN2PORT(_x) ((_x) + 1)
+#define PORT2CHAN(_x) ((_x) - 1)
+
+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[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 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 */
+
+ 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_vlun_resize(struct scsi_device *, struct dk_cxlflash_resize *);
+int _cxlflash_vlun_resize(struct scsi_device *, struct ctx_info *,
+ struct dk_cxlflash_resize *);
+
+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_disk_clone(struct scsi_device *, struct dk_cxlflash_clone *);
+
+int cxlflash_disk_virtual_open(struct scsi_device *, void *);
+
+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 *);
+
+void cxlflash_ba_terminate(struct ba_lun *);
+
+int cxlflash_manage_lun(struct scsi_device *, struct dk_cxlflash_manage_lun *);
+
+int check_state(struct cxlflash_cfg *);
+
+#endif /* ifndef _CXLFLASH_SUPERPIPE_H */
Code Review / kvmfornfv.git / blobdiff