2 * CXL Flash Device Driver
4 * Written by: Manoj N. Kumar <manoj@linux.vnet.ibm.com>, IBM Corporation
5 * Matthew R. Ochs <mrochs@linux.vnet.ibm.com>, IBM Corporation
7 * Copyright (C) 2015 IBM Corporation
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
15 #ifndef _CXLFLASH_COMMON_H
16 #define _CXLFLASH_COMMON_H
18 #include <linux/list.h>
19 #include <linux/types.h>
20 #include <scsi/scsi.h>
21 #include <scsi/scsi_device.h>
24 #define MAX_CONTEXT CXLFLASH_MAX_CONTEXT /* num contexts per afu */
26 #define CXLFLASH_BLOCK_SIZE 4096 /* 4K blocks */
27 #define CXLFLASH_MAX_XFER_SIZE 16777216 /* 16MB transfer */
28 #define CXLFLASH_MAX_SECTORS (CXLFLASH_MAX_XFER_SIZE/512) /* SCSI wants
35 #define NUM_RRQ_ENTRY 16 /* for master issued cmds */
36 #define MAX_RHT_PER_CONTEXT (PAGE_SIZE / sizeof(struct sisl_rht_entry))
38 /* AFU command retry limit */
39 #define MC_RETRY_CNT 5 /* sufficient for SCSI check and
42 /* Command management definitions */
43 #define CXLFLASH_NUM_CMDS (2 * CXLFLASH_MAX_CMDS) /* Must be a pow2 for
49 #define CXLFLASH_MAX_CMDS 16
50 #define CXLFLASH_MAX_CMDS_PER_LUN CXLFLASH_MAX_CMDS
53 static inline void check_sizes(void)
55 BUILD_BUG_ON_NOT_POWER_OF_2(CXLFLASH_NUM_CMDS);
58 /* AFU defines a fixed size of 4K for command buffers (borrow 4K page define) */
59 #define CMD_BUFSIZE SIZE_4K
61 /* flags in IOA status area for host use */
63 #define B_ERROR 0x02 /* set with B_DONE */
64 #define B_TIMEOUT 0x04 /* set with B_DONE & B_ERROR */
66 enum cxlflash_lr_state {
72 enum cxlflash_init_state {
80 STATE_NORMAL, /* Normal running state, everything good */
81 STATE_LIMBO, /* Limbo running state, trying to reset/recover */
82 STATE_FAILTERM /* Failed/terminating state, error out users/threads */
86 * Each context has its own set of resource handles that is visible
87 * only from that context.
92 struct cxl_context *mcctx;
95 struct pci_device_id *dev_id;
96 struct Scsi_Host *host;
98 ulong cxlflash_regs_pci;
100 struct work_struct work_q;
101 enum cxlflash_init_state init_state;
102 enum cxlflash_lr_state lr_state;
105 struct cxl_afu *cxl_afu;
107 struct pci_pool *cxlflash_cmd_pool;
108 struct pci_dev *parent_dev;
110 wait_queue_head_t tmf_waitq;
112 wait_queue_head_t limbo_waitq;
113 enum cxlflash_state state;
117 struct sisl_ioarcb rcb; /* IOARCB (cache line aligned) */
118 struct sisl_ioasa sa; /* IOASA must follow IOARCB */
120 struct completion cevent;
121 char *buf; /* per command buffer */
128 /* As per the SISLITE spec the IOARCB EA has to be 16-byte aligned.
129 * However for performance reasons the IOARCB/IOASA should be
130 * cache line aligned.
132 } __aligned(cache_line_size());
135 /* Stuff requiring alignment go first. */
137 u64 rrq_entry[NUM_RRQ_ENTRY]; /* 128B RRQ */
139 * Command & data for AFU commands.
141 struct afu_cmd cmd[CXLFLASH_NUM_CMDS];
143 /* Beware of alignment till here. Preferably introduce new
144 * fields after this point
148 struct cxl_ioctl_start_work work;
149 struct cxlflash_afu_map *afu_map; /* entire MMIO map */
150 struct sisl_host_map *host_map; /* MC host map */
151 struct sisl_ctrl_map *ctrl_map; /* MC control map */
153 ctx_hndl_t ctx_hndl; /* master's context handle */
161 u32 cmd_couts; /* Number of command checkouts */
162 u32 internal_lun; /* User-desired LUN mode for this AFU */
165 u64 interface_version;
167 struct cxlflash_cfg *parent; /* Pointer back to parent cxlflash_cfg */
171 static inline u64 lun_to_lunid(u64 lun)
175 int_to_scsilun(lun, (struct scsi_lun *)&lun_id);
176 return swab64(lun_id);
179 int cxlflash_send_cmd(struct afu *, struct afu_cmd *);
180 void cxlflash_wait_resp(struct afu *, struct afu_cmd *);
181 int cxlflash_afu_reset(struct cxlflash_cfg *);
182 struct afu_cmd *cxlflash_cmd_checkout(struct afu *);
183 void cxlflash_cmd_checkin(struct afu_cmd *);
184 int cxlflash_afu_sync(struct afu *, ctx_hndl_t, res_hndl_t, u8);
185 #endif /* ifndef _CXLFLASH_COMMON_H */