summaryrefslogtreecommitdiffstats
path: root/drivers/scsi/cxlflash/sislite.h
blob: 63bf394fe78c7a7ffd8c5f4b131b001466c3c499 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
/*
 * 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 _SISLITE_H
#define _SISLITE_H

#include <linux/types.h>

typedef u16 ctx_hndl_t;
typedef u32 res_hndl_t;

#define SIZE_4K		4096
#define SIZE_64K	65536

/*
 * IOARCB: 64 bytes, min 16 byte alignment required, host native endianness
 * except for SCSI CDB which remains big endian per SCSI standards.
 */
struct sisl_ioarcb {
	u16 ctx_id;		/* ctx_hndl_t */
	u16 req_flags;
#define SISL_REQ_FLAGS_RES_HNDL       0x8000U	/* bit 0 (MSB) */
#define SISL_REQ_FLAGS_PORT_LUN_ID    0x0000U

#define SISL_REQ_FLAGS_SUP_UNDERRUN   0x4000U	/* bit 1 */

#define SISL_REQ_FLAGS_TIMEOUT_SECS   0x0000U	/* bits 8,9 */
#define SISL_REQ_FLAGS_TIMEOUT_MSECS  0x0040U
#define SISL_REQ_FLAGS_TIMEOUT_USECS  0x0080U
#define SISL_REQ_FLAGS_TIMEOUT_CYCLES 0x00C0U

#define SISL_REQ_FLAGS_TMF_CMD        0x0004u	/* bit 13 */

#define SISL_REQ_FLAGS_AFU_CMD        0x0002U	/* bit 14 */

#define SISL_REQ_FLAGS_HOST_WRITE     0x0001U	/* bit 15 (LSB) */
#define SISL_REQ_FLAGS_HOST_READ      0x0000U

	union {
		u32 res_hndl;	/* res_hndl_t */
		u32 port_sel;	/* this is a selection mask:
				 * 0x1 -> port#0 can be selected,
				 * 0x2 -> port#1 can be selected.
				 * Can be bitwise ORed.
				 */
	};
	u64 lun_id;
	u32 data_len;		/* 4K for read/write */
	u32 ioadl_len;
	union {
		u64 data_ea;	/* min 16 byte aligned */
		u64 ioadl_ea;
	};
	u8 msi;			/* LISN to send on RRQ write */
#define SISL_MSI_CXL_PFAULT        0	/* reserved for CXL page faults */
#define SISL_MSI_SYNC_ERROR        1	/* recommended for AFU sync error */
#define SISL_MSI_RRQ_UPDATED       2	/* recommended for IO completion */
#define SISL_MSI_ASYNC_ERROR       3	/* master only - for AFU async error */

	u8 rrq;			/* 0 for a single RRQ */
	u16 timeout;		/* in units specified by req_flags */
	u32 rsvd1;
	u8 cdb[16];		/* must be in big endian */
	struct scsi_cmnd *scp;
} __packed;

struct sisl_rc {
	u8 flags;
#define SISL_RC_FLAGS_SENSE_VALID         0x80U
#define SISL_RC_FLAGS_FCP_RSP_CODE_VALID  0x40U
#define SISL_RC_FLAGS_OVERRUN             0x20U
#define SISL_RC_FLAGS_UNDERRUN            0x10U

	u8 afu_rc;
#define SISL_AFU_RC_RHT_INVALID           0x01U	/* user error */
#define SISL_AFU_RC_RHT_UNALIGNED         0x02U	/* should never happen */
#define SISL_AFU_RC_RHT_OUT_OF_BOUNDS     0x03u	/* user error */
#define SISL_AFU_RC_RHT_DMA_ERR           0x04u	/* see afu_extra
						   may retry if afu_retry is off
						   possible on master exit
						 */
#define SISL_AFU_RC_RHT_RW_PERM           0x05u	/* no RW perms, user error */
#define SISL_AFU_RC_LXT_UNALIGNED         0x12U	/* should never happen */
#define SISL_AFU_RC_LXT_OUT_OF_BOUNDS     0x13u	/* user error */
#define SISL_AFU_RC_LXT_DMA_ERR           0x14u	/* see afu_extra
						   may retry if afu_retry is off
						   possible on master exit
						 */
#define SISL_AFU_RC_LXT_RW_PERM           0x15u	/* no RW perms, user error */

#define SISL_AFU_RC_NOT_XLATE_HOST        0x1au	/* possible if master exited */

	/* NO_CHANNELS means the FC ports selected by dest_port in
	 * IOARCB or in the LXT entry are down when the AFU tried to select
	 * a FC port. If the port went down on an active IO, it will set
	 * fc_rc to =0x54(NOLOGI) or 0x57(LINKDOWN) instead.
	 */
#define SISL_AFU_RC_NO_CHANNELS           0x20U	/* see afu_extra, may retry */
#define SISL_AFU_RC_CAP_VIOLATION         0x21U	/* either user error or
						   afu reset/master restart
						 */
#define SISL_AFU_RC_OUT_OF_DATA_BUFS      0x30U	/* always retry */
#define SISL_AFU_RC_DATA_DMA_ERR          0x31U	/* see afu_extra
						   may retry if afu_retry is off
						 */

	u8 scsi_rc;		/* SCSI status byte, retry as appropriate */
#define SISL_SCSI_RC_CHECK                0x02U
#define SISL_SCSI_RC_BUSY                 0x08u

	u8 fc_rc;		/* retry */
	/*
	 * We should only see fc_rc=0x57 (LINKDOWN) or 0x54(NOLOGI) for
	 * commands that are in flight when a link goes down or is logged out.
	 * If the link is down or logged out before AFU selects the port, either
	 * it will choose the other port or we will get afu_rc=0x20 (no_channel)
	 * if there is no valid port to use.
	 *
	 * ABORTPEND/ABORTOK/ABORTFAIL/TGTABORT can be retried, typically these
	 * would happen if a frame is dropped and something times out.
	 * NOLOGI or LINKDOWN can be retried if the other port is up.
	 * RESIDERR can be retried as well.
	 *
	 * ABORTFAIL might indicate that lots of frames are getting CRC errors.
	 * So it maybe retried once and reset the link if it happens again.
	 * The link can also be reset on the CRC error threshold interrupt.
	 */
#define SISL_FC_RC_ABORTPEND	0x52	/* exchange timeout or abort request */
#define SISL_FC_RC_WRABORTPEND	0x53	/* due to write XFER_RDY invalid */
#define SISL_FC_RC_NOLOGI	0x54	/* port not logged in, in-flight cmds */
#define SISL_FC_RC_NOEXP	0x55	/* FC protocol error or HW bug */
#define SISL_FC_RC_INUSE	0x56	/* tag already in use, HW bug */
#define SISL_FC_RC_LINKDOWN	0x57	/* link down, in-flight cmds */
#define SISL_FC_RC_ABORTOK	0x58	/* pending abort completed w/success */
#define SISL_FC_RC_ABORTFAIL	0x59	/* pending abort completed w/fail */
#define SISL_FC_RC_RESID	0x5A	/* ioasa underrun/overrun flags set */
#define SISL_FC_RC_RESIDERR	0x5B	/* actual data len does not match SCSI
					   reported len, possbly due to dropped
					   frames */
#define SISL_FC_RC_TGTABORT	0x5C	/* command aborted by target */
};

#define SISL_SENSE_DATA_LEN     20	/* Sense data length         */

/*
 * IOASA: 64 bytes & must follow IOARCB, min 16 byte alignment required,
 * host native endianness
 */
struct sisl_ioasa {
	union {
		struct sisl_rc rc;
		u32 ioasc;
#define SISL_IOASC_GOOD_COMPLETION        0x00000000U
	};
	u32 resid;
	u8 port;
	u8 afu_extra;
	/* when afu_rc=0x04, 0x14, 0x31 (_xxx_DMA_ERR):
	 * afu_exta contains PSL response code. Useful codes are:
	 */
#define SISL_AFU_DMA_ERR_PAGE_IN	0x0A	/* AFU_retry_on_pagein Action
						 *  Enabled            N/A
						 *  Disabled           retry
						 */
#define SISL_AFU_DMA_ERR_INVALID_EA	0x0B	/* this is a hard error
						 * afu_rc	Implies
						 * 0x04, 0x14	master exit.
						 * 0x31         user error.
						 */
	/* when afu rc=0x20 (no channels):
	 * afu_extra bits [4:5]: available portmask,  [6:7]: requested portmask.
	 */
#define SISL_AFU_NO_CLANNELS_AMASK(afu_extra) (((afu_extra) & 0x0C) >> 2)
#define SISL_AFU_NO_CLANNELS_RMASK(afu_extra) ((afu_extra) & 0x03)

	u8 scsi_extra;
	u8 fc_extra;
	u8 sense_data[SISL_SENSE_DATA_LEN];

	/* These fields are defined by the SISlite architecture for the
	 * host to use as they see fit for their implementation.
	 */
	union {
		u64 host_use[4];
		u8 host_use_b[32];
	};
} __packed;

#define SISL_RESP_HANDLE_T_BIT        0x1ULL	/* Toggle bit */

/* MMIO space is required to support only 64-bit access */

/*
 * This AFU has two mechanisms to deal with endian-ness.
 * One is a global configuration (in the afu_config) register
 * below that specifies the endian-ness of the host.
 * The other is a per context (i.e. application) specification
 * controlled by the endian_ctrl field here. Since the master
 * context is one such application the master context's
 * endian-ness is set to be the same as the host.
 *
 * As per the SISlite spec, the MMIO registers are always
 * big endian.
 */
#define SISL_ENDIAN_CTRL_BE           0x8000000000000080ULL
#define SISL_ENDIAN_CTRL_LE           0x0000000000000000ULL

#ifdef __BIG_ENDIAN
#define SISL_ENDIAN_CTRL              SISL_ENDIAN_CTRL_BE
#else
#define SISL_ENDIAN_CTRL              SISL_ENDIAN_CTRL_LE
#endif

/* per context host transport MMIO  */
struct sisl_host_map {
	__be64 endian_ctrl;     /* Per context Endian Control. The AFU will
			      * operate on whatever the context is of the
			      * host application.
			      */

	__be64 intr_status;	/* this sends LISN# programmed in ctx_ctrl.
				 * Only recovery in a PERM_ERR is a context
				 * exit since there is no way to tell which
				 * command caused the error.
				 */
#define SISL_ISTATUS_PERM_ERR_CMDROOM    0x0010ULL	/* b59, user error */
#define SISL_ISTATUS_PERM_ERR_RCB_READ   0x0008ULL	/* b60, user error */
#define SISL_ISTATUS_PERM_ERR_SA_WRITE   0x0004ULL	/* b61, user error */
#define SISL_ISTATUS_PERM_ERR_RRQ_WRITE  0x0002ULL	/* b62, user error */
	/* Page in wait accessing RCB/IOASA/RRQ is reported in b63.
	 * Same error in data/LXT/RHT access is reported via IOASA.
	 */
#define SISL_ISTATUS_TEMP_ERR_PAGEIN     0x0001ULL	/* b63, can be generated
							 * only when AFU auto
							 * retry is disabled.
							 * If user can determine
							 * the command that
							 * caused the error, it
							 * can be retried.
							 */
#define SISL_ISTATUS_UNMASK  (0x001FULL)	/* 1 means unmasked */
#define SISL_ISTATUS_MASK    ~(SISL_ISTATUS_UNMASK)	/* 1 means masked */

	__be64 intr_clear;
	__be64 intr_mask;
	__be64 ioarrin;		/* only write what cmd_room permits */
	__be64 rrq_start;	/* start & end are both inclusive */
	__be64 rrq_end;		/* write sequence: start followed by end */
	__be64 cmd_room;
	__be64 ctx_ctrl;	/* least signiifcant byte or b56:63 is LISN# */
	__be64 mbox_w;		/* restricted use */
};

/* per context provisioning & control MMIO */
struct sisl_ctrl_map {
	__be64 rht_start;
	__be64 rht_cnt_id;
	/* both cnt & ctx_id args must be ULL */
#define SISL_RHT_CNT_ID(cnt, ctx_id)  (((cnt) << 48) | ((ctx_id) << 32))

	__be64 ctx_cap;	/* afu_rc below is when the capability is violated */
#define SISL_CTX_CAP_PROXY_ISSUE       0x8000000000000000ULL /* afu_rc 0x21 */
#define SISL_CTX_CAP_REAL_MODE         0x4000000000000000ULL /* afu_rc 0x21 */
#define SISL_CTX_CAP_HOST_XLATE        0x2000000000000000ULL /* afu_rc 0x1a */
#define SISL_CTX_CAP_PROXY_TARGET      0x1000000000000000ULL /* afu_rc 0x21 */
#define SISL_CTX_CAP_AFU_CMD           0x0000000000000008ULL /* afu_rc 0x21 */
#define SISL_CTX_CAP_GSCSI_CMD         0x0000000000000004ULL /* afu_rc 0x21 */
#define SISL_CTX_CAP_WRITE_CMD         0x0000000000000002ULL /* afu_rc 0x21 */
#define SISL_CTX_CAP_READ_CMD          0x0000000000000001ULL /* afu_rc 0x21 */
	__be64 mbox_r;
};

/* single copy global regs */
struct sisl_global_regs {
	__be64 aintr_status;
	/* In cxlflash, each FC port/link gets a byte of status */
#define SISL_ASTATUS_FC0_OTHER	 0x8000ULL /* b48, other err,
					      FC_ERRCAP[31:20] */
#define SISL_ASTATUS_FC0_LOGO    0x4000ULL /* b49, target sent FLOGI/PLOGI/LOGO
						   while logged in */
#define SISL_ASTATUS_FC0_CRC_T   0x2000ULL /* b50, CRC threshold exceeded */
#define SISL_ASTATUS_FC0_LOGI_R  0x1000ULL /* b51, login state mechine timed out
						   and retrying */
#define SISL_ASTATUS_FC0_LOGI_F  0x0800ULL /* b52, login failed,
					      FC_ERROR[19:0] */
#define SISL_ASTATUS_FC0_LOGI_S  0x0400ULL /* b53, login succeeded */
#define SISL_ASTATUS_FC0_LINK_DN 0x0200ULL /* b54, link online to offline */
#define SISL_ASTATUS_FC0_LINK_UP 0x0100ULL /* b55, link offline to online */

#define SISL_ASTATUS_FC1_OTHER   0x0080ULL /* b56 */
#define SISL_ASTATUS_FC1_LOGO    0x0040ULL /* b57 */
#define SISL_ASTATUS_FC1_CRC_T   0x0020ULL /* b58 */
#define SISL_ASTATUS_FC1_LOGI_R  0x0010ULL /* b59 */
#define SISL_ASTATUS_FC1_LOGI_F  0x0008ULL /* b60 */
#define SISL_ASTATUS_FC1_LOGI_S  0x0004ULL /* b61 */
#define SISL_ASTATUS_FC1_LINK_DN 0x0002ULL /* b62 */
#define SISL_ASTATUS_FC1_LINK_UP 0x0001ULL /* b63 */

#define SISL_FC_INTERNAL_UNMASK	0x0000000300000000ULL	/* 1 means unmasked */
#define SISL_FC_INTERNAL_MASK	~(SISL_FC_INTERNAL_UNMASK)
#define SISL_FC_INTERNAL_SHIFT	32

#define SISL_ASTATUS_UNMASK	0xFFFFULL		/* 1 means unmasked */
#define SISL_ASTATUS_MASK	~(SISL_ASTATUS_UNMASK)	/* 1 means masked */

	__be64 aintr_clear;
	__be64 aintr_mask;
	__be64 afu_ctrl;
	__be64 afu_hb;
	__be64 afu_scratch_pad;
	__be64 afu_port_sel;
#define SISL_AFUCONF_AR_IOARCB	0x4000ULL
#define SISL_AFUCONF_AR_LXT	0x2000ULL
#define SISL_AFUCONF_AR_RHT	0x1000ULL
#define SISL_AFUCONF_AR_DATA	0x0800ULL
#define SISL_AFUCONF_AR_RSRC	0x0400ULL
#define SISL_AFUCONF_AR_IOASA	0x0200ULL
#define SISL_AFUCONF_AR_RRQ	0x0100ULL
/* Aggregate all Auto Retry Bits */
#define SISL_AFUCONF_AR_ALL	(SISL_AFUCONF_AR_IOARCB|SISL_AFUCONF_AR_LXT| \
				 SISL_AFUCONF_AR_RHT|SISL_AFUCONF_AR_DATA|   \
				 SISL_AFUCONF_AR_RSRC|SISL_AFUCONF_AR_IOASA| \
				 SISL_AFUCONF_AR_RRQ)
#ifdef __BIG_ENDIAN
#define SISL_AFUCONF_ENDIAN            0x0000ULL
#else
#define SISL_AFUCONF_ENDIAN            0x0020ULL
#endif
#define SISL_AFUCONF_MBOX_CLR_READ     0x0010ULL
	__be64 afu_config;
	__be64 rsvd[0xf8];
	__be64 afu_version;
	__be64 interface_version;
};

#define CXLFLASH_NUM_FC_PORTS   2
#define CXLFLASH_MAX_CONTEXT  512	/* how many contexts per afu */
#define CXLFLASH_NUM_VLUNS    512

struct sisl_global_map {
	union {
		struct sisl_global_regs regs;
		char page0[SIZE_4K];	/* page 0 */
	};

	char page1[SIZE_4K];	/* page 1 */

	/* pages 2 & 3 */
	__be64 fc_regs[CXLFLASH_NUM_FC_PORTS][CXLFLASH_NUM_VLUNS];

	/* pages 4 & 5 (lun tbl) */
	__be64 fc_port[CXLFLASH_NUM_FC_PORTS][CXLFLASH_NUM_VLUNS];

};

/*
 * CXL Flash Memory Map
 *
 *	+-------------------------------+
 *	|    512 * 64 KB User MMIO      |
 *	|        (per context)          |
 *	|       User Accessible         |
 *	+-------------------------------+
 *	|    512 * 128 B per context    |
 *	|    Provisioning and Control   |
 *	|   Trusted Process accessible  |
 *	+-------------------------------+
 *	|         64 KB Global          |
 *	|   Trusted Process accessible  |
 *	+-------------------------------+
*/
struct cxlflash_afu_map {
	union {
		struct sisl_host_map host;
		char harea[SIZE_64K];	/* 64KB each */
	} hosts[CXLFLASH_MAX_CONTEXT];

	union {
		struct sisl_ctrl_map ctrl;
		char carea[cache_line_size()];	/* 128B each */
	} ctrls[CXLFLASH_MAX_CONTEXT];

	union {
		struct sisl_global_map global;
		char garea[SIZE_64K];	/* 64KB single block */
	};
};

/*
 * LXT - LBA Translation Table
 * LXT control blocks
 */
struct sisl_lxt_entry {
	u64 rlba_base;	/* bits 0:47 is base
			 * b48:55 is lun index
			 * b58:59 is write & read perms
			 * (if no perm, afu_rc=0x15)
			 * b60:63 is port_sel mask
			 */
};

/*
 * RHT - Resource Handle Table
 * Per the SISlite spec, RHT entries are to be 16-byte aligned
 */
struct sisl_rht_entry {
	struct sisl_lxt_entry *lxt_start;
	u32 lxt_cnt;
	u16 rsvd;
	u8 fp;			/* format & perm nibbles.
				 * (if no perm, afu_rc=0x05)
				 */
	u8 nmask;
} __packed __aligned(16);

struct sisl_rht_entry_f1 {
	u64 lun_id;
	union {
		struct {
			u8 valid;
			u8 rsvd[5];
			u8 fp;
			u8 port_sel;
		};

		u64 dw;
	};
} __packed __aligned(16);

/* make the fp byte */
#define SISL_RHT_FP(fmt, perm) (((fmt) << 4) | (perm))

/* make the fp byte for a clone from a source fp and clone flags
 * flags must be only 2 LSB bits.
 */
#define SISL_RHT_FP_CLONE(src_fp, cln_flags) ((src_fp) & (0xFC | (cln_flags)))

#define RHT_PERM_READ  0x01U
#define RHT_PERM_WRITE 0x02U
#define RHT_PERM_RW    (RHT_PERM_READ | RHT_PERM_WRITE)

/* extract the perm bits from a fp */
#define SISL_RHT_PERM(fp) ((fp) & RHT_PERM_RW)

#define PORT0  0x01U
#define PORT1  0x02U
#define BOTH_PORTS    (PORT0 | PORT1)

/* AFU Sync Mode byte */
#define AFU_LW_SYNC 0x0U
#define AFU_HW_SYNC 0x1U
#define AFU_GSYNC   0x2U

/* Special Task Management Function CDB */
#define TMF_LUN_RESET  0x1U
#define TMF_CLEAR_ACA  0x2U


#define SISLITE_MAX_WS_BLOCKS 512

#endif /* _SISLITE_H */
OpenPOWER on IntegriCloud