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Commit | Line | Data |
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c21e0bbf MO |
1 | /* |
2 | * CXL Flash Device Driver | |
3 | * | |
4 | * Written by: Manoj N. Kumar <manoj@linux.vnet.ibm.com>, IBM Corporation | |
5 | * Matthew R. Ochs <mrochs@linux.vnet.ibm.com>, IBM Corporation | |
6 | * | |
7 | * Copyright (C) 2015 IBM Corporation | |
8 | * | |
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. | |
13 | */ | |
14 | ||
15 | #ifndef _CXLFLASH_COMMON_H | |
16 | #define _CXLFLASH_COMMON_H | |
17 | ||
2588f222 | 18 | #include <linux/irq_poll.h> |
c21e0bbf | 19 | #include <linux/list.h> |
0a27ae51 | 20 | #include <linux/rwsem.h> |
c21e0bbf MO |
21 | #include <linux/types.h> |
22 | #include <scsi/scsi.h> | |
5fbb96c8 | 23 | #include <scsi/scsi_cmnd.h> |
c21e0bbf MO |
24 | #include <scsi/scsi_device.h> |
25 | ||
17ead26f | 26 | extern const struct file_operations cxlflash_cxl_fops; |
c21e0bbf | 27 | |
66d4bce4 | 28 | #define MAX_CONTEXT CXLFLASH_MAX_CONTEXT /* num contexts per afu */ |
a290b480 MO |
29 | #define MAX_FC_PORTS CXLFLASH_MAX_FC_PORTS /* max ports per AFU */ |
30 | #define LEGACY_FC_PORTS 2 /* legacy ports per AFU */ | |
31 | ||
32 | #define CHAN2PORTBANK(_x) ((_x) >> ilog2(CXLFLASH_NUM_FC_PORTS_PER_BANK)) | |
33 | #define CHAN2BANKPORT(_x) ((_x) & (CXLFLASH_NUM_FC_PORTS_PER_BANK - 1)) | |
c21e0bbf | 34 | |
e8e17ea6 MO |
35 | #define CHAN2PORTMASK(_x) (1 << (_x)) /* channel to port mask */ |
36 | #define PORTMASK2CHAN(_x) (ilog2((_x))) /* port mask to channel */ | |
37 | #define PORTNUM2CHAN(_x) ((_x) - 1) /* port number to channel */ | |
38 | ||
39e9d618 | 39 | #define CXLFLASH_BLOCK_SIZE 4096 /* 4K blocks */ |
c21e0bbf MO |
40 | #define CXLFLASH_MAX_XFER_SIZE 16777216 /* 16MB transfer */ |
41 | #define CXLFLASH_MAX_SECTORS (CXLFLASH_MAX_XFER_SIZE/512) /* SCSI wants | |
39e9d618 MO |
42 | * max_sectors |
43 | * in units of | |
44 | * 512 byte | |
45 | * sectors | |
46 | */ | |
c21e0bbf | 47 | |
c21e0bbf MO |
48 | #define MAX_RHT_PER_CONTEXT (PAGE_SIZE / sizeof(struct sisl_rht_entry)) |
49 | ||
50 | /* AFU command retry limit */ | |
39e9d618 | 51 | #define MC_RETRY_CNT 5 /* Sufficient for SCSI and certain AFU errors */ |
c21e0bbf MO |
52 | |
53 | /* Command management definitions */ | |
83430833 | 54 | #define CXLFLASH_MAX_CMDS 256 |
c21e0bbf MO |
55 | #define CXLFLASH_MAX_CMDS_PER_LUN CXLFLASH_MAX_CMDS |
56 | ||
83430833 MK |
57 | /* RRQ for master issued cmds */ |
58 | #define NUM_RRQ_ENTRY CXLFLASH_MAX_CMDS | |
59 | ||
bae0ac69 MO |
60 | /* SQ for master issued cmds */ |
61 | #define NUM_SQ_ENTRY CXLFLASH_MAX_CMDS | |
62 | ||
bb85ef68 MO |
63 | /* Hardware queue definitions */ |
64 | #define CXLFLASH_DEF_HWQS 1 | |
65 | #define CXLFLASH_MAX_HWQS 8 | |
a583d00a UK |
66 | #define PRIMARY_HWQ 0 |
67 | ||
c21e0bbf MO |
68 | |
69 | static inline void check_sizes(void) | |
70 | { | |
a290b480 | 71 | BUILD_BUG_ON_NOT_POWER_OF_2(CXLFLASH_NUM_FC_PORTS_PER_BANK); |
db853d50 | 72 | BUILD_BUG_ON_NOT_POWER_OF_2(CXLFLASH_MAX_CMDS); |
c21e0bbf MO |
73 | } |
74 | ||
75 | /* AFU defines a fixed size of 4K for command buffers (borrow 4K page define) */ | |
76 | #define CMD_BUFSIZE SIZE_4K | |
77 | ||
c21e0bbf MO |
78 | enum cxlflash_lr_state { |
79 | LINK_RESET_INVALID, | |
80 | LINK_RESET_REQUIRED, | |
81 | LINK_RESET_COMPLETE | |
82 | }; | |
83 | ||
84 | enum cxlflash_init_state { | |
85 | INIT_STATE_NONE, | |
86 | INIT_STATE_PCI, | |
87 | INIT_STATE_AFU, | |
88 | INIT_STATE_SCSI | |
89 | }; | |
90 | ||
5cdac81a | 91 | enum cxlflash_state { |
f92ba507 MO |
92 | STATE_PROBING, /* Initial state during probe */ |
93 | STATE_PROBED, /* Temporary state, probe completed but EEH occurred */ | |
5cdac81a | 94 | STATE_NORMAL, /* Normal running state, everything good */ |
439e85c1 | 95 | STATE_RESET, /* Reset state, trying to reset/recover */ |
5cdac81a MO |
96 | STATE_FAILTERM /* Failed/terminating state, error out users/threads */ |
97 | }; | |
98 | ||
c21e0bbf MO |
99 | /* |
100 | * Each context has its own set of resource handles that is visible | |
101 | * only from that context. | |
102 | */ | |
103 | ||
104 | struct cxlflash_cfg { | |
105 | struct afu *afu; | |
c21e0bbf MO |
106 | |
107 | struct pci_dev *dev; | |
108 | struct pci_device_id *dev_id; | |
109 | struct Scsi_Host *host; | |
66d4bce4 | 110 | int num_fc_ports; |
c21e0bbf MO |
111 | |
112 | ulong cxlflash_regs_pci; | |
113 | ||
c21e0bbf MO |
114 | struct work_struct work_q; |
115 | enum cxlflash_init_state init_state; | |
116 | enum cxlflash_lr_state lr_state; | |
117 | int lr_port; | |
ef51074a | 118 | atomic_t scan_host_needed; |
c21e0bbf MO |
119 | |
120 | struct cxl_afu *cxl_afu; | |
c21e0bbf | 121 | |
65be2c79 MO |
122 | atomic_t recovery_threads; |
123 | struct mutex ctx_recovery_mutex; | |
124 | struct mutex ctx_tbl_list_mutex; | |
0a27ae51 | 125 | struct rw_semaphore ioctl_rwsem; |
65be2c79 MO |
126 | struct ctx_info *ctx_tbl[MAX_CONTEXT]; |
127 | struct list_head ctx_err_recovery; /* contexts w/ recovery pending */ | |
128 | struct file_operations cxl_fops; | |
129 | ||
2cb79266 | 130 | /* Parameters that are LUN table related */ |
66d4bce4 | 131 | int last_lun_index[MAX_FC_PORTS]; |
2cb79266 | 132 | int promote_lun_index; |
65be2c79 MO |
133 | struct list_head lluns; /* list of llun_info structs */ |
134 | ||
c21e0bbf | 135 | wait_queue_head_t tmf_waitq; |
018d1dc9 | 136 | spinlock_t tmf_slock; |
c21e0bbf | 137 | bool tmf_active; |
439e85c1 | 138 | wait_queue_head_t reset_waitq; |
5cdac81a | 139 | enum cxlflash_state state; |
c21e0bbf MO |
140 | }; |
141 | ||
142 | struct afu_cmd { | |
143 | struct sisl_ioarcb rcb; /* IOARCB (cache line aligned) */ | |
144 | struct sisl_ioasa sa; /* IOASA must follow IOARCB */ | |
c21e0bbf | 145 | struct afu *parent; |
fe7f9698 | 146 | struct scsi_cmnd *scp; |
9ba848ac | 147 | struct completion cevent; |
7bb512aa | 148 | struct list_head queue; |
c21e0bbf MO |
149 | |
150 | u8 cmd_tmf:1; | |
a583d00a | 151 | u32 hwq_index; |
c21e0bbf MO |
152 | |
153 | /* As per the SISLITE spec the IOARCB EA has to be 16-byte aligned. | |
154 | * However for performance reasons the IOARCB/IOASA should be | |
155 | * cache line aligned. | |
156 | */ | |
157 | } __aligned(cache_line_size()); | |
158 | ||
5fbb96c8 MO |
159 | static inline struct afu_cmd *sc_to_afuc(struct scsi_cmnd *sc) |
160 | { | |
161 | return PTR_ALIGN(scsi_cmd_priv(sc), __alignof__(struct afu_cmd)); | |
162 | } | |
163 | ||
164 | static inline struct afu_cmd *sc_to_afucz(struct scsi_cmnd *sc) | |
165 | { | |
166 | struct afu_cmd *afuc = sc_to_afuc(sc); | |
167 | ||
168 | memset(afuc, 0, sizeof(*afuc)); | |
169 | return afuc; | |
170 | } | |
171 | ||
a583d00a | 172 | struct hwq { |
c21e0bbf | 173 | /* Stuff requiring alignment go first. */ |
bae0ac69 MO |
174 | struct sisl_ioarcb sq[NUM_SQ_ENTRY]; /* 16K SQ */ |
175 | u64 rrq_entry[NUM_RRQ_ENTRY]; /* 2K RRQ */ | |
c21e0bbf MO |
176 | |
177 | /* Beware of alignment till here. Preferably introduce new | |
178 | * fields after this point | |
179 | */ | |
a583d00a UK |
180 | struct afu *afu; |
181 | struct cxl_context *ctx; | |
c21e0bbf | 182 | struct cxl_ioctl_start_work work; |
1786f4a0 MO |
183 | struct sisl_host_map __iomem *host_map; /* MC host map */ |
184 | struct sisl_ctrl_map __iomem *ctrl_map; /* MC control map */ | |
c21e0bbf | 185 | ctx_hndl_t ctx_hndl; /* master's context handle */ |
a583d00a | 186 | u32 index; /* Index of this hwq */ |
bae0ac69 MO |
187 | |
188 | atomic_t hsq_credits; | |
189 | spinlock_t hsq_slock; | |
190 | struct sisl_ioarcb *hsq_start; | |
191 | struct sisl_ioarcb *hsq_end; | |
192 | struct sisl_ioarcb *hsq_curr; | |
7bb512aa | 193 | spinlock_t hrrq_slock; |
c21e0bbf MO |
194 | u64 *hrrq_start; |
195 | u64 *hrrq_end; | |
196 | u64 *hrrq_curr; | |
197 | bool toggle; | |
a583d00a | 198 | |
11f7b184 UK |
199 | s64 room; |
200 | spinlock_t rrin_slock; /* Lock to rrin queuing and cmd_room updates */ | |
a583d00a UK |
201 | |
202 | struct irq_poll irqpoll; | |
203 | } __aligned(cache_line_size()); | |
204 | ||
205 | struct afu { | |
bb85ef68 | 206 | struct hwq hwqs[CXLFLASH_MAX_HWQS]; |
a583d00a UK |
207 | int (*send_cmd)(struct afu *, struct afu_cmd *); |
208 | void (*context_reset)(struct afu_cmd *); | |
209 | ||
210 | /* AFU HW */ | |
211 | struct cxlflash_afu_map __iomem *afu_map; /* entire MMIO map */ | |
212 | ||
213 | atomic_t cmds_active; /* Number of currently active AFU commands */ | |
c21e0bbf | 214 | u64 hb; |
c21e0bbf | 215 | u32 internal_lun; /* User-desired LUN mode for this AFU */ |
bb85ef68 MO |
216 | u32 num_hwqs; /* Number of hardware queues */ |
217 | u32 desired_hwqs; /* Desired h/w queues, effective on AFU reset */ | |
c21e0bbf | 218 | |
e5ce067b | 219 | char version[16]; |
c21e0bbf MO |
220 | u64 interface_version; |
221 | ||
2588f222 | 222 | u32 irqpoll_weight; |
c21e0bbf | 223 | struct cxlflash_cfg *parent; /* Pointer back to parent cxlflash_cfg */ |
c21e0bbf MO |
224 | }; |
225 | ||
a583d00a UK |
226 | static inline struct hwq *get_hwq(struct afu *afu, u32 index) |
227 | { | |
bb85ef68 | 228 | WARN_ON(index >= CXLFLASH_MAX_HWQS); |
a583d00a UK |
229 | |
230 | return &afu->hwqs[index]; | |
231 | } | |
232 | ||
2588f222 MO |
233 | static inline bool afu_is_irqpoll_enabled(struct afu *afu) |
234 | { | |
235 | return !!afu->irqpoll_weight; | |
236 | } | |
237 | ||
bae0ac69 MO |
238 | static inline bool afu_is_cmd_mode(struct afu *afu, u64 cmd_mode) |
239 | { | |
240 | u64 afu_cap = afu->interface_version >> SISL_INTVER_CAP_SHIFT; | |
241 | ||
242 | return afu_cap & cmd_mode; | |
243 | } | |
244 | ||
245 | static inline bool afu_is_sq_cmd_mode(struct afu *afu) | |
246 | { | |
247 | return afu_is_cmd_mode(afu, SISL_INTVER_CAP_SQ_CMD_MODE); | |
248 | } | |
249 | ||
250 | static inline bool afu_is_ioarrin_cmd_mode(struct afu *afu) | |
251 | { | |
252 | return afu_is_cmd_mode(afu, SISL_INTVER_CAP_IOARRIN_CMD_MODE); | |
253 | } | |
254 | ||
c21e0bbf MO |
255 | static inline u64 lun_to_lunid(u64 lun) |
256 | { | |
1786f4a0 | 257 | __be64 lun_id; |
c21e0bbf MO |
258 | |
259 | int_to_scsilun(lun, (struct scsi_lun *)&lun_id); | |
1786f4a0 | 260 | return be64_to_cpu(lun_id); |
c21e0bbf MO |
261 | } |
262 | ||
a290b480 MO |
263 | static inline struct fc_port_bank __iomem *get_fc_port_bank( |
264 | struct cxlflash_cfg *cfg, int i) | |
c885d3fe MO |
265 | { |
266 | struct afu *afu = cfg->afu; | |
267 | ||
a290b480 MO |
268 | return &afu->afu_map->global.bank[CHAN2PORTBANK(i)]; |
269 | } | |
270 | ||
271 | static inline __be64 __iomem *get_fc_port_regs(struct cxlflash_cfg *cfg, int i) | |
272 | { | |
273 | struct fc_port_bank __iomem *fcpb = get_fc_port_bank(cfg, i); | |
274 | ||
275 | return &fcpb->fc_port_regs[CHAN2BANKPORT(i)][0]; | |
c885d3fe MO |
276 | } |
277 | ||
278 | static inline __be64 __iomem *get_fc_port_luns(struct cxlflash_cfg *cfg, int i) | |
279 | { | |
a290b480 | 280 | struct fc_port_bank __iomem *fcpb = get_fc_port_bank(cfg, i); |
c885d3fe | 281 | |
a290b480 | 282 | return &fcpb->fc_port_luns[CHAN2BANKPORT(i)][0]; |
c885d3fe MO |
283 | } |
284 | ||
39e9d618 | 285 | int cxlflash_afu_sync(struct afu *afu, ctx_hndl_t c, res_hndl_t r, u8 mode); |
65be2c79 MO |
286 | void cxlflash_list_init(void); |
287 | void cxlflash_term_global_luns(void); | |
288 | void cxlflash_free_errpage(void); | |
39e9d618 MO |
289 | int cxlflash_ioctl(struct scsi_device *sdev, int cmd, void __user *arg); |
290 | void cxlflash_stop_term_user_contexts(struct cxlflash_cfg *cfg); | |
291 | int cxlflash_mark_contexts_error(struct cxlflash_cfg *cfg); | |
292 | void cxlflash_term_local_luns(struct cxlflash_cfg *cfg); | |
293 | void cxlflash_restore_luntable(struct cxlflash_cfg *cfg); | |
65be2c79 | 294 | |
c21e0bbf | 295 | #endif /* ifndef _CXLFLASH_COMMON_H */ |