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 _SISLITE_H 16#define _SISLITE_H 17 18#include <linux/types.h> 19 20typedef u16 ctx_hndl_t; 21typedef u32 res_hndl_t; 22 23#define SIZE_4K 4096 24#define SIZE_64K 65536 25 26/* 27 * IOARCB: 64 bytes, min 16 byte alignment required, host native endianness 28 * except for SCSI CDB which remains big endian per SCSI standards. 29 */ 30struct sisl_ioarcb { 31 u16 ctx_id; /* ctx_hndl_t */ 32 u16 req_flags; 33#define SISL_REQ_FLAGS_RES_HNDL 0x8000U /* bit 0 (MSB) */ 34#define SISL_REQ_FLAGS_PORT_LUN_ID 0x0000U 35 36#define SISL_REQ_FLAGS_SUP_UNDERRUN 0x4000U /* bit 1 */ 37 38#define SISL_REQ_FLAGS_TIMEOUT_SECS 0x0000U /* bits 8,9 */ 39#define SISL_REQ_FLAGS_TIMEOUT_MSECS 0x0040U 40#define SISL_REQ_FLAGS_TIMEOUT_USECS 0x0080U 41#define SISL_REQ_FLAGS_TIMEOUT_CYCLES 0x00C0U 42 43#define SISL_REQ_FLAGS_TMF_CMD 0x0004u /* bit 13 */ 44 45#define SISL_REQ_FLAGS_AFU_CMD 0x0002U /* bit 14 */ 46 47#define SISL_REQ_FLAGS_HOST_WRITE 0x0001U /* bit 15 (LSB) */ 48#define SISL_REQ_FLAGS_HOST_READ 0x0000U 49 50 union { 51 u32 res_hndl; /* res_hndl_t */ 52 u32 port_sel; /* this is a selection mask: 53 * 0x1 -> port#0 can be selected, 54 * 0x2 -> port#1 can be selected. 55 * Can be bitwise ORed. 56 */ 57 }; 58 u64 lun_id; 59 u32 data_len; /* 4K for read/write */ 60 u32 ioadl_len; 61 union { 62 u64 data_ea; /* min 16 byte aligned */ 63 u64 ioadl_ea; 64 }; 65 u8 msi; /* LISN to send on RRQ write */ 66#define SISL_MSI_CXL_PFAULT 0 /* reserved for CXL page faults */ 67#define SISL_MSI_SYNC_ERROR 1 /* recommended for AFU sync error */ 68#define SISL_MSI_RRQ_UPDATED 2 /* recommended for IO completion */ 69#define SISL_MSI_ASYNC_ERROR 3 /* master only - for AFU async error */ 70 71 u8 rrq; /* 0 for a single RRQ */ 72 u16 timeout; /* in units specified by req_flags */ 73 u32 rsvd1; 74 u8 cdb[16]; /* must be in big endian */ 75 struct scsi_cmnd *scp; 76} __packed; 77 78struct sisl_rc { 79 u8 flags; 80#define SISL_RC_FLAGS_SENSE_VALID 0x80U 81#define SISL_RC_FLAGS_FCP_RSP_CODE_VALID 0x40U 82#define SISL_RC_FLAGS_OVERRUN 0x20U 83#define SISL_RC_FLAGS_UNDERRUN 0x10U 84 85 u8 afu_rc; 86#define SISL_AFU_RC_RHT_INVALID 0x01U /* user error */ 87#define SISL_AFU_RC_RHT_UNALIGNED 0x02U /* should never happen */ 88#define SISL_AFU_RC_RHT_OUT_OF_BOUNDS 0x03u /* user error */ 89#define SISL_AFU_RC_RHT_DMA_ERR 0x04u /* see afu_extra 90 may retry if afu_retry is off 91 possible on master exit 92 */ 93#define SISL_AFU_RC_RHT_RW_PERM 0x05u /* no RW perms, user error */ 94#define SISL_AFU_RC_LXT_UNALIGNED 0x12U /* should never happen */ 95#define SISL_AFU_RC_LXT_OUT_OF_BOUNDS 0x13u /* user error */ 96#define SISL_AFU_RC_LXT_DMA_ERR 0x14u /* see afu_extra 97 may retry if afu_retry is off 98 possible on master exit 99 */ 100#define SISL_AFU_RC_LXT_RW_PERM 0x15u /* no RW perms, user error */ 101 102#define SISL_AFU_RC_NOT_XLATE_HOST 0x1au /* possible if master exited */ 103 104 /* NO_CHANNELS means the FC ports selected by dest_port in 105 * IOARCB or in the LXT entry are down when the AFU tried to select 106 * a FC port. If the port went down on an active IO, it will set 107 * fc_rc to =0x54(NOLOGI) or 0x57(LINKDOWN) instead. 108 */ 109#define SISL_AFU_RC_NO_CHANNELS 0x20U /* see afu_extra, may retry */ 110#define SISL_AFU_RC_CAP_VIOLATION 0x21U /* either user error or 111 afu reset/master restart 112 */ 113#define SISL_AFU_RC_OUT_OF_DATA_BUFS 0x30U /* always retry */ 114#define SISL_AFU_RC_DATA_DMA_ERR 0x31U /* see afu_extra 115 may retry if afu_retry is off 116 */ 117 118 u8 scsi_rc; /* SCSI status byte, retry as appropriate */ 119#define SISL_SCSI_RC_CHECK 0x02U 120#define SISL_SCSI_RC_BUSY 0x08u 121 122 u8 fc_rc; /* retry */ 123 /* 124 * We should only see fc_rc=0x57 (LINKDOWN) or 0x54(NOLOGI) for 125 * commands that are in flight when a link goes down or is logged out. 126 * If the link is down or logged out before AFU selects the port, either 127 * it will choose the other port or we will get afu_rc=0x20 (no_channel) 128 * if there is no valid port to use. 129 * 130 * ABORTPEND/ABORTOK/ABORTFAIL/TGTABORT can be retried, typically these 131 * would happen if a frame is dropped and something times out. 132 * NOLOGI or LINKDOWN can be retried if the other port is up. 133 * RESIDERR can be retried as well. 134 * 135 * ABORTFAIL might indicate that lots of frames are getting CRC errors. 136 * So it maybe retried once and reset the link if it happens again. 137 * The link can also be reset on the CRC error threshold interrupt. 138 */ 139#define SISL_FC_RC_ABORTPEND 0x52 /* exchange timeout or abort request */ 140#define SISL_FC_RC_WRABORTPEND 0x53 /* due to write XFER_RDY invalid */ 141#define SISL_FC_RC_NOLOGI 0x54 /* port not logged in, in-flight cmds */ 142#define SISL_FC_RC_NOEXP 0x55 /* FC protocol error or HW bug */ 143#define SISL_FC_RC_INUSE 0x56 /* tag already in use, HW bug */ 144#define SISL_FC_RC_LINKDOWN 0x57 /* link down, in-flight cmds */ 145#define SISL_FC_RC_ABORTOK 0x58 /* pending abort completed w/success */ 146#define SISL_FC_RC_ABORTFAIL 0x59 /* pending abort completed w/fail */ 147#define SISL_FC_RC_RESID 0x5A /* ioasa underrun/overrun flags set */ 148#define SISL_FC_RC_RESIDERR 0x5B /* actual data len does not match SCSI 149 reported len, possibly due to dropped 150 frames */ 151#define SISL_FC_RC_TGTABORT 0x5C /* command aborted by target */ 152}; 153 154#define SISL_SENSE_DATA_LEN 20 /* Sense data length */ 155 156/* 157 * IOASA: 64 bytes & must follow IOARCB, min 16 byte alignment required, 158 * host native endianness 159 */ 160struct sisl_ioasa { 161 union { 162 struct sisl_rc rc; 163 u32 ioasc; 164#define SISL_IOASC_GOOD_COMPLETION 0x00000000U 165 }; 166 u32 resid; 167 u8 port; 168 u8 afu_extra; 169 /* when afu_rc=0x04, 0x14, 0x31 (_xxx_DMA_ERR): 170 * afu_exta contains PSL response code. Useful codes are: 171 */ 172#define SISL_AFU_DMA_ERR_PAGE_IN 0x0A /* AFU_retry_on_pagein Action 173 * Enabled N/A 174 * Disabled retry 175 */ 176#define SISL_AFU_DMA_ERR_INVALID_EA 0x0B /* this is a hard error 177 * afu_rc Implies 178 * 0x04, 0x14 master exit. 179 * 0x31 user error. 180 */ 181 /* when afu rc=0x20 (no channels): 182 * afu_extra bits [4:5]: available portmask, [6:7]: requested portmask. 183 */ 184#define SISL_AFU_NO_CLANNELS_AMASK(afu_extra) (((afu_extra) & 0x0C) >> 2) 185#define SISL_AFU_NO_CLANNELS_RMASK(afu_extra) ((afu_extra) & 0x03) 186 187 u8 scsi_extra; 188 u8 fc_extra; 189 u8 sense_data[SISL_SENSE_DATA_LEN]; 190 191 /* These fields are defined by the SISlite architecture for the 192 * host to use as they see fit for their implementation. 193 */ 194 union { 195 u64 host_use[4]; 196 u8 host_use_b[32]; 197 }; 198} __packed; 199 200#define SISL_RESP_HANDLE_T_BIT 0x1ULL /* Toggle bit */ 201 202/* MMIO space is required to support only 64-bit access */ 203 204/* 205 * This AFU has two mechanisms to deal with endian-ness. 206 * One is a global configuration (in the afu_config) register 207 * below that specifies the endian-ness of the host. 208 * The other is a per context (i.e. application) specification 209 * controlled by the endian_ctrl field here. Since the master 210 * context is one such application the master context's 211 * endian-ness is set to be the same as the host. 212 * 213 * As per the SISlite spec, the MMIO registers are always 214 * big endian. 215 */ 216#define SISL_ENDIAN_CTRL_BE 0x8000000000000080ULL 217#define SISL_ENDIAN_CTRL_LE 0x0000000000000000ULL 218 219#ifdef __BIG_ENDIAN 220#define SISL_ENDIAN_CTRL SISL_ENDIAN_CTRL_BE 221#else 222#define SISL_ENDIAN_CTRL SISL_ENDIAN_CTRL_LE 223#endif 224 225/* per context host transport MMIO */ 226struct sisl_host_map { 227 __be64 endian_ctrl; /* Per context Endian Control. The AFU will 228 * operate on whatever the context is of the 229 * host application. 230 */ 231 232 __be64 intr_status; /* this sends LISN# programmed in ctx_ctrl. 233 * Only recovery in a PERM_ERR is a context 234 * exit since there is no way to tell which 235 * command caused the error. 236 */ 237#define SISL_ISTATUS_PERM_ERR_CMDROOM 0x0010ULL /* b59, user error */ 238#define SISL_ISTATUS_PERM_ERR_RCB_READ 0x0008ULL /* b60, user error */ 239#define SISL_ISTATUS_PERM_ERR_SA_WRITE 0x0004ULL /* b61, user error */ 240#define SISL_ISTATUS_PERM_ERR_RRQ_WRITE 0x0002ULL /* b62, user error */ 241 /* Page in wait accessing RCB/IOASA/RRQ is reported in b63. 242 * Same error in data/LXT/RHT access is reported via IOASA. 243 */ 244#define SISL_ISTATUS_TEMP_ERR_PAGEIN 0x0001ULL /* b63, can be generated 245 * only when AFU auto 246 * retry is disabled. 247 * If user can determine 248 * the command that 249 * caused the error, it 250 * can be retried. 251 */ 252#define SISL_ISTATUS_UNMASK (0x001FULL) /* 1 means unmasked */ 253#define SISL_ISTATUS_MASK ~(SISL_ISTATUS_UNMASK) /* 1 means masked */ 254 255 __be64 intr_clear; 256 __be64 intr_mask; 257 __be64 ioarrin; /* only write what cmd_room permits */ 258 __be64 rrq_start; /* start & end are both inclusive */ 259 __be64 rrq_end; /* write sequence: start followed by end */ 260 __be64 cmd_room; 261 __be64 ctx_ctrl; /* least significant byte or b56:63 is LISN# */ 262 __be64 mbox_w; /* restricted use */ 263}; 264 265/* per context provisioning & control MMIO */ 266struct sisl_ctrl_map { 267 __be64 rht_start; 268 __be64 rht_cnt_id; 269 /* both cnt & ctx_id args must be ULL */ 270#define SISL_RHT_CNT_ID(cnt, ctx_id) (((cnt) << 48) | ((ctx_id) << 32)) 271 272 __be64 ctx_cap; /* afu_rc below is when the capability is violated */ 273#define SISL_CTX_CAP_PROXY_ISSUE 0x8000000000000000ULL /* afu_rc 0x21 */ 274#define SISL_CTX_CAP_REAL_MODE 0x4000000000000000ULL /* afu_rc 0x21 */ 275#define SISL_CTX_CAP_HOST_XLATE 0x2000000000000000ULL /* afu_rc 0x1a */ 276#define SISL_CTX_CAP_PROXY_TARGET 0x1000000000000000ULL /* afu_rc 0x21 */ 277#define SISL_CTX_CAP_AFU_CMD 0x0000000000000008ULL /* afu_rc 0x21 */ 278#define SISL_CTX_CAP_GSCSI_CMD 0x0000000000000004ULL /* afu_rc 0x21 */ 279#define SISL_CTX_CAP_WRITE_CMD 0x0000000000000002ULL /* afu_rc 0x21 */ 280#define SISL_CTX_CAP_READ_CMD 0x0000000000000001ULL /* afu_rc 0x21 */ 281 __be64 mbox_r; 282}; 283 284/* single copy global regs */ 285struct sisl_global_regs { 286 __be64 aintr_status; 287 /* In cxlflash, each FC port/link gets a byte of status */ 288#define SISL_ASTATUS_FC0_OTHER 0x8000ULL /* b48, other err, 289 FC_ERRCAP[31:20] */ 290#define SISL_ASTATUS_FC0_LOGO 0x4000ULL /* b49, target sent FLOGI/PLOGI/LOGO 291 while logged in */ 292#define SISL_ASTATUS_FC0_CRC_T 0x2000ULL /* b50, CRC threshold exceeded */ 293#define SISL_ASTATUS_FC0_LOGI_R 0x1000ULL /* b51, login state machine timed out 294 and retrying */ 295#define SISL_ASTATUS_FC0_LOGI_F 0x0800ULL /* b52, login failed, 296 FC_ERROR[19:0] */ 297#define SISL_ASTATUS_FC0_LOGI_S 0x0400ULL /* b53, login succeeded */ 298#define SISL_ASTATUS_FC0_LINK_DN 0x0200ULL /* b54, link online to offline */ 299#define SISL_ASTATUS_FC0_LINK_UP 0x0100ULL /* b55, link offline to online */ 300 301#define SISL_ASTATUS_FC1_OTHER 0x0080ULL /* b56 */ 302#define SISL_ASTATUS_FC1_LOGO 0x0040ULL /* b57 */ 303#define SISL_ASTATUS_FC1_CRC_T 0x0020ULL /* b58 */ 304#define SISL_ASTATUS_FC1_LOGI_R 0x0010ULL /* b59 */ 305#define SISL_ASTATUS_FC1_LOGI_F 0x0008ULL /* b60 */ 306#define SISL_ASTATUS_FC1_LOGI_S 0x0004ULL /* b61 */ 307#define SISL_ASTATUS_FC1_LINK_DN 0x0002ULL /* b62 */ 308#define SISL_ASTATUS_FC1_LINK_UP 0x0001ULL /* b63 */ 309 310#define SISL_FC_INTERNAL_UNMASK 0x0000000300000000ULL /* 1 means unmasked */ 311#define SISL_FC_INTERNAL_MASK ~(SISL_FC_INTERNAL_UNMASK) 312#define SISL_FC_INTERNAL_SHIFT 32 313 314#define SISL_ASTATUS_UNMASK 0xFFFFULL /* 1 means unmasked */ 315#define SISL_ASTATUS_MASK ~(SISL_ASTATUS_UNMASK) /* 1 means masked */ 316 317 __be64 aintr_clear; 318 __be64 aintr_mask; 319 __be64 afu_ctrl; 320 __be64 afu_hb; 321 __be64 afu_scratch_pad; 322 __be64 afu_port_sel; 323#define SISL_AFUCONF_AR_IOARCB 0x4000ULL 324#define SISL_AFUCONF_AR_LXT 0x2000ULL 325#define SISL_AFUCONF_AR_RHT 0x1000ULL 326#define SISL_AFUCONF_AR_DATA 0x0800ULL 327#define SISL_AFUCONF_AR_RSRC 0x0400ULL 328#define SISL_AFUCONF_AR_IOASA 0x0200ULL 329#define SISL_AFUCONF_AR_RRQ 0x0100ULL 330/* Aggregate all Auto Retry Bits */ 331#define SISL_AFUCONF_AR_ALL (SISL_AFUCONF_AR_IOARCB|SISL_AFUCONF_AR_LXT| \ 332 SISL_AFUCONF_AR_RHT|SISL_AFUCONF_AR_DATA| \ 333 SISL_AFUCONF_AR_RSRC|SISL_AFUCONF_AR_IOASA| \ 334 SISL_AFUCONF_AR_RRQ) 335#ifdef __BIG_ENDIAN 336#define SISL_AFUCONF_ENDIAN 0x0000ULL 337#else 338#define SISL_AFUCONF_ENDIAN 0x0020ULL 339#endif 340#define SISL_AFUCONF_MBOX_CLR_READ 0x0010ULL 341 __be64 afu_config; 342 __be64 rsvd[0xf8]; 343 __le64 afu_version; 344 __be64 interface_version; 345}; 346 347#define CXLFLASH_NUM_FC_PORTS 2 348#define CXLFLASH_MAX_CONTEXT 512 /* how many contexts per afu */ 349#define CXLFLASH_NUM_VLUNS 512 350 351struct sisl_global_map { 352 union { 353 struct sisl_global_regs regs; 354 char page0[SIZE_4K]; /* page 0 */ 355 }; 356 357 char page1[SIZE_4K]; /* page 1 */ 358 359 /* pages 2 & 3 */ 360 __be64 fc_regs[CXLFLASH_NUM_FC_PORTS][CXLFLASH_NUM_VLUNS]; 361 362 /* pages 4 & 5 (lun tbl) */ 363 __be64 fc_port[CXLFLASH_NUM_FC_PORTS][CXLFLASH_NUM_VLUNS]; 364 365}; 366 367/* 368 * CXL Flash Memory Map 369 * 370 * +-------------------------------+ 371 * | 512 * 64 KB User MMIO | 372 * | (per context) | 373 * | User Accessible | 374 * +-------------------------------+ 375 * | 512 * 128 B per context | 376 * | Provisioning and Control | 377 * | Trusted Process accessible | 378 * +-------------------------------+ 379 * | 64 KB Global | 380 * | Trusted Process accessible | 381 * +-------------------------------+ 382*/ 383struct cxlflash_afu_map { 384 union { 385 struct sisl_host_map host; 386 char harea[SIZE_64K]; /* 64KB each */ 387 } hosts[CXLFLASH_MAX_CONTEXT]; 388 389 union { 390 struct sisl_ctrl_map ctrl; 391 char carea[cache_line_size()]; /* 128B each */ 392 } ctrls[CXLFLASH_MAX_CONTEXT]; 393 394 union { 395 struct sisl_global_map global; 396 char garea[SIZE_64K]; /* 64KB single block */ 397 }; 398}; 399 400/* 401 * LXT - LBA Translation Table 402 * LXT control blocks 403 */ 404struct sisl_lxt_entry { 405 u64 rlba_base; /* bits 0:47 is base 406 * b48:55 is lun index 407 * b58:59 is write & read perms 408 * (if no perm, afu_rc=0x15) 409 * b60:63 is port_sel mask 410 */ 411}; 412 413/* 414 * RHT - Resource Handle Table 415 * Per the SISlite spec, RHT entries are to be 16-byte aligned 416 */ 417struct sisl_rht_entry { 418 struct sisl_lxt_entry *lxt_start; 419 u32 lxt_cnt; 420 u16 rsvd; 421 u8 fp; /* format & perm nibbles. 422 * (if no perm, afu_rc=0x05) 423 */ 424 u8 nmask; 425} __packed __aligned(16); 426 427struct sisl_rht_entry_f1 { 428 u64 lun_id; 429 union { 430 struct { 431 u8 valid; 432 u8 rsvd[5]; 433 u8 fp; 434 u8 port_sel; 435 }; 436 437 u64 dw; 438 }; 439} __packed __aligned(16); 440 441/* make the fp byte */ 442#define SISL_RHT_FP(fmt, perm) (((fmt) << 4) | (perm)) 443 444/* make the fp byte for a clone from a source fp and clone flags 445 * flags must be only 2 LSB bits. 446 */ 447#define SISL_RHT_FP_CLONE(src_fp, cln_flags) ((src_fp) & (0xFC | (cln_flags))) 448 449#define RHT_PERM_READ 0x01U 450#define RHT_PERM_WRITE 0x02U 451#define RHT_PERM_RW (RHT_PERM_READ | RHT_PERM_WRITE) 452 453/* extract the perm bits from a fp */ 454#define SISL_RHT_PERM(fp) ((fp) & RHT_PERM_RW) 455 456#define PORT0 0x01U 457#define PORT1 0x02U 458#define BOTH_PORTS (PORT0 | PORT1) 459 460/* AFU Sync Mode byte */ 461#define AFU_LW_SYNC 0x0U 462#define AFU_HW_SYNC 0x1U 463#define AFU_GSYNC 0x2U 464 465/* Special Task Management Function CDB */ 466#define TMF_LUN_RESET 0x1U 467#define TMF_CLEAR_ACA 0x2U 468 469 470#define SISLITE_MAX_WS_BLOCKS 512 471 472#endif /* _SISLITE_H */ 473