1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22 /* 23 * Copyright 2006 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 #ifndef _LDC_IMPL_H 28 #define _LDC_IMPL_H 29 30 #pragma ident "%Z%%M% %I% %E% SMI" 31 32 #ifdef __cplusplus 33 extern "C" { 34 #endif 35 36 #include <sys/types.h> 37 #include <sys/ddi.h> 38 #include <sys/sunddi.h> 39 #include <sys/ioctl.h> 40 41 /* Memory map table entries */ 42 #define LDC_MTBL_ENTRIES 8192 /* 8 K */ 43 44 /* Define LDC Queue info */ 45 #define LDC_PACKET_SHIFT 6 46 #define LDC_QUEUE_ENTRIES 512 47 #define LDC_MTU_MSGS 4 48 #define LDC_QUEUE_SIZE (LDC_QUEUE_ENTRIES << LDC_PACKET_SHIFT) 49 #define LDC_DEFAULT_MTU (LDC_QUEUE_SIZE / LDC_MTU_MSGS) 50 51 /* 52 * LDC Reliable mode - initial packet seqid 53 * - If peer initiated handshake, RDX should contain init_seqid + 1 54 * - If this endpoint initiated handshake first data packet should 55 * contain the message init_seqid + 1 56 */ 57 #define LDC_INIT_SEQID 0x0 58 59 /* LDC Message types */ 60 #define LDC_CTRL 0x01 /* Control Pkt */ 61 #define LDC_DATA 0x02 /* Data Pkt */ 62 #define LDC_ERR 0x10 /* Error Pkt */ 63 64 /* LDC Message Subtypes */ 65 #define LDC_INFO 0x01 /* Control/Data/Error info pkt */ 66 #define LDC_ACK 0x02 /* Control/Data ACK */ 67 #define LDC_NACK 0x04 /* Control/Data NACK */ 68 69 /* LDC Control Messages */ 70 #define LDC_VER 0x01 /* Version message */ 71 #define LDC_RTS 0x02 /* Request to Send */ 72 #define LDC_RTR 0x03 /* Ready To Receive */ 73 #define LDC_RDX 0x04 /* Ready for data exchange */ 74 75 #define LDC_CTRL_MASK 0x0f /* Mask to read control bits */ 76 77 /* LDC Channel Transport State (tstate) */ 78 #define TS_TXQ_RDY 0x01 /* allocated TX queue */ 79 #define TS_RXQ_RDY 0x02 /* allocated RX queue */ 80 #define TS_INIT (TS_TXQ_RDY | TS_RXQ_RDY) 81 #define TS_QCONF_RDY 0x04 /* registered queues with HV */ 82 #define TS_CNEX_RDY 0x08 /* registered channel with cnex */ 83 #define TS_OPEN (TS_INIT | TS_QCONF_RDY | TS_CNEX_RDY) 84 #define TS_LINK_READY 0x10 /* both endpts registered Rx queues */ 85 #define TS_READY (TS_OPEN | TS_LINK_READY) 86 #define TS_VER_DONE 0x20 /* negotiated version */ 87 #define TS_VREADY (TS_READY | TS_VER_DONE) 88 #define TS_HSHAKE_DONE 0x40 /* completed handshake */ 89 #define TS_UP (TS_READY | TS_VER_DONE | TS_HSHAKE_DONE) 90 91 /* LDC Channel Transport Handshake states */ 92 #define TS_SENT_VER 0x01 /* Sent version */ 93 #define TS_SENT_RTS 0x02 /* Sent RTS */ 94 #define TS_RCVD_RTR 0x04 /* Received RTR */ 95 #define TS_SENT_RDX 0x08 /* Sent RDX */ 96 #define TS_RCVD_VER 0x10 /* Received version */ 97 #define TS_RCVD_RTS 0x20 /* Received RTS */ 98 #define TS_SENT_RTR 0x40 /* Sent RTR */ 99 #define TS_RCVD_RDX 0x80 /* Received RDX */ 100 101 /* LDC MSG Envelope */ 102 #define LDC_LEN_MASK 0x3F 103 #define LDC_FRAG_MASK 0xC0 104 105 #define LDC_FRAG_START 0x40 /* frag_info = 0x01 */ 106 #define LDC_FRAG_STOP 0x80 /* frag_info = 0x02 */ 107 #define LDC_FRAG_CONT 0x00 /* frag_info = 0x00 */ 108 109 /* 110 * LDC will retry LDC_MAX_RETRIES times when sending or 111 * receiving data or if the HV returns back EWOULDBLOCK. 112 * Between each retry it will wait LDC_DELAY usecs. 113 */ 114 #define LDC_MAX_RETRIES 1000 115 #define LDC_DELAY 1 116 117 /* 118 * LDC Version information 119 */ 120 #define LDC_PAYLOAD_VER_OFF 8 /* offset of version in payload */ 121 122 typedef struct ldc_ver { 123 uint16_t major; 124 uint16_t minor; 125 } ldc_ver_t; 126 127 /* 128 * Each guest consists of one or more LDC endpoints represented by a ldc_chan 129 * structure. Each ldc_chan structure points to a ldc_mtbl structure that 130 * contains information about the map table associated with this LDC endpoint. 131 * The map table contains the list of pages being shared by this guest over 132 * this endpoint with the guest at the other end of this endpoint. Each LDC 133 * endpoint also points to a list of memory handles used to bind and export 134 * memory segments from this guest. If a memory segment is bound, it points to 135 * a memory segment structure, which inturn consists of an array of ldc_page 136 * structure for all the pages within that segment. Each ldc_page structure 137 * contains information about the shared page and also points to the 138 * corresponding entry in the map table. 139 * 140 * Each LDC endpoint also points to a list of ldc_dring structures that refer 141 * to both imported and exported descriptor rings. If it is a exported 142 * descriptor ring, it then points to memory handle/memseg corresponding to 143 * the region of memory associated with the descriptor ring. 144 * 145 * +----------+ +----------+ +----------+ 146 * | ldc_chan |-->| ldc_chan |-->| ldc_chan |-->.... 147 * +----------+ +----------+ +----------+ 148 * | | | 149 * | | | 150 * | | | +-----------+ +-----------+ 151 * | | +----->| ldc_dring |---->| ldc_dring |---->...... 152 * | | +-----------+ +-----------+ 153 * | | | 154 * | | +----------------------------+ 155 * | | | 156 * | | v 157 * | | +----------+ +----------+ +----------+ 158 * | +----->| ldc_mhdl |---->| ldc_mhdl |---->| ldc_mhdl |---> .... 159 * | +----------+ +----------+ +----------+ 160 * v | | 161 * +----------+ | +------------+ | +------------+ 162 * | ldc_mtbl |--+ +--->| ldc_memseg |-----+ +--->| ldc_memseg | 163 * +----------+ | +------------+ | +------------+ 164 * | | | | | 165 * v v v | v 166 * +--------------+ +----------+ +--------+ | +--------+ 167 * | ldc_mte_slot |<--------| ldc_page | | cookie | | | cookie | 168 * +--------------+ +----------+ +--------+ | +--------+ 169 * | ldc_mte_slot |<--------| ldc_page | | cookie | v 170 * +--------------+ +----------+ +--------+ +----------+ 171 * | ldc_mte_slot |<-----------------------------------| ldc_page | 172 * +--------------+ +----------+ 173 * | ldc_mte_slot | 174 * +--------------+ 175 * | ...... |/ +------------+ 176 * +--------------+ | entry | 177 * | ldc_mte_slot | +------------+ 178 * +--------------+ | inv_cookie | 179 * \ +------------+ 180 * 181 */ 182 183 /* 184 * Message format of each packet sent over the LDC channel. 185 * Each packet is 64-bytes long. 186 * 187 * Each packet that is sent over LDC can contain either data or acks. 188 * The type will reflect the contents. The len will contain in bytes 189 * the amount of data being sent. In the case of ACKs, the seqid and 190 * data fields will contain the SEQIDs of messages for which ACKs are 191 * being sent. 192 * 193 * Raw pkt format: 194 * 195 * +------------------------------------------------------+ 196 * 0 - 7 | data payload | 197 * +------------------------------------------------------+ 198 * 199 * Unreliable pkt format: 200 * 201 * +------------------------------------------------------+ 202 * 0 | seqid | env | ctrl | stype | type | 203 * +------------------------------------------------------+ 204 * 1 - 7 | data payload | 205 * +------------------------------------------------------+ 206 * 207 * Reliable pkt format: 208 * 209 * +------------------------------------------------------+ 210 * 0 | seqid | env | ctrl | stype | type | 211 * +------------------------------------------------------+ 212 * 1 | ackid | unused | 213 * +------------------------------------------------------+ 214 * 2 - 7 | data payload | 215 * +------------------------------------------------------+ 216 */ 217 218 typedef struct ldc_msg { 219 union { 220 struct { 221 uint8_t _type; /* Message type */ 222 uint8_t _stype; /* Message subtype */ 223 uint8_t _ctrl; /* Control/Error Message */ 224 uint8_t _env; /* Message Envelope */ 225 uint32_t _seqid; /* Sequence ID */ 226 227 union { 228 uint8_t _ud[LDC_PAYLOAD_SIZE_UNRELIABLE]; 229 /* Unreliable data payload */ 230 struct { 231 uint32_t _unused; /* unused */ 232 uint32_t _ackid; /* ACK ID */ 233 uint8_t _rd[LDC_PAYLOAD_SIZE_RELIABLE]; 234 /* Reliable data payload */ 235 } _rl; 236 } _data; 237 } _tpkt; 238 239 uint8_t _raw[LDC_PAYLOAD_SIZE_RAW]; 240 } _pkt; 241 242 } ldc_msg_t; 243 244 #define raw _pkt._raw 245 #define type _pkt._tpkt._type 246 #define stype _pkt._tpkt._stype 247 #define ctrl _pkt._tpkt._ctrl 248 #define env _pkt._tpkt._env 249 #define seqid _pkt._tpkt._seqid 250 #define udata _pkt._tpkt._data._ud 251 #define ackid _pkt._tpkt._data._rl._ackid 252 #define rdata _pkt._tpkt._data._rl._rd 253 254 /* 255 * LDC Map Table Entry (MTE) 256 * 257 * 6 6 1 1 1 258 * |3 0| psz| 3| 1| 0| 9| 8| 7|6|5|4| 0| 259 * +------+--------------------------+----+----+--+--+--+--+-+-+-+-------+ 260 * | rsvd | PFN | 0 | 0 |CW|CR|IW|IR|X|W|R| pgszc | 261 * +------+--------------------------+----+----+--+--+--+--+-+-+-+-------+ 262 * | hv invalidation cookie | 263 * +---------------------------------------------------------------------+ 264 */ 265 typedef union { 266 struct { 267 uint64_t _rsvd2:8, /* <63:56> reserved */ 268 rpfn:43, /* <55:13> real pfn */ 269 _rsvd1:2, /* <12:11> reserved */ 270 cw:1, /* <10> copy write access */ 271 cr:1, /* <9> copy read perm */ 272 iw:1, /* <8> iommu write perm */ 273 ir:1, /* <7> iommu read perm */ 274 x:1, /* <6> execute perm */ 275 w:1, /* <5> write perm */ 276 r:1, /* <4> read perm */ 277 pgszc:4; /* <3:0> pgsz code */ 278 } mte_bit; 279 280 uint64_t ll; 281 282 } ldc_mte_t; 283 284 #define mte_rpfn mte_bit.rpfn 285 #define mte_cw mte_bit.cw 286 #define mte_cr mte_bit.cr 287 #define mte_iw mte_bit.iw 288 #define mte_ir mte_bit.ir 289 #define mte_x mte_bit.x 290 #define mte_w mte_bit.w 291 #define mte_r mte_bit.r 292 #define mte_pgszc mte_bit.pgszc 293 294 #define MTE_BSZS_SHIFT(sz) ((sz) * 3) 295 #define MTEBYTES(sz) (MMU_PAGESIZE << MTE_BSZS_SHIFT(sz)) 296 #define MTEPAGES(sz) (1 << MTE_BSZS_SHIFT(sz)) 297 #define MTE_PAGE_SHIFT(sz) (MMU_PAGESHIFT + MTE_BSZS_SHIFT(sz)) 298 #define MTE_PAGE_OFFSET(sz) (MTEBYTES(sz) - 1) 299 #define MTE_PAGEMASK(sz) (~MTE_PAGE_OFFSET(sz)) 300 #define MTE_PFNMASK(sz) (~(MTE_PAGE_OFFSET(sz) >> MMU_PAGESHIFT)) 301 302 /* 303 * LDC Map Table Slot 304 */ 305 typedef struct ldc_mte_slot { 306 ldc_mte_t entry; 307 uint64_t cookie; 308 } ldc_mte_slot_t; 309 310 /* 311 * LDC Memory Map Table 312 * 313 * Each LDC has a memory map table it uses to list all the pages 314 * it exporting to its peer over the channel. This structure 315 * contains information about the map table and is pointed to 316 * by the ldc_chan structure. 317 */ 318 typedef struct ldc_mtbl { 319 kmutex_t lock; /* Table lock */ 320 size_t size; /* Table size (in bytes) */ 321 uint64_t next_entry; /* Next entry to use */ 322 uint64_t num_entries; /* Num entries in table */ 323 uint64_t num_avail; /* Num of available entries */ 324 ldc_mte_slot_t *table; /* The table itself */ 325 } ldc_mtbl_t; 326 327 /* 328 * LDC page and memory segment information 329 */ 330 typedef struct ldc_page { 331 uintptr_t raddr; /* Exported page RA */ 332 uint64_t offset; /* Exported page offset */ 333 size_t size; /* Exported page size */ 334 uint64_t index; /* Index in map table */ 335 ldc_mte_slot_t *mte; /* Map table entry */ 336 } ldc_page_t; 337 338 typedef struct ldc_memseg { 339 caddr_t vaddr; /* Exported segment VA */ 340 uintptr_t raddr; /* Exported segment VA */ 341 size_t size; /* Exported segment size */ 342 uint64_t npages; /* Number of pages */ 343 ldc_page_t *pages; /* Array of exported pages */ 344 uint32_t ncookies; /* Number of cookies */ 345 ldc_mem_cookie_t *cookies; 346 uint64_t next_cookie; /* Index to next cookie */ 347 } ldc_memseg_t; 348 349 /* 350 * LDC Cookie address format 351 * 352 * 6 6 m+n 353 * |3| 0| | m| 0| 354 * +-+-------+----------+-------------------+-------------------+ 355 * |X| pgszc | rsvd | table_idx | page_offset | 356 * +-+-------+----------+-------------------+-------------------+ 357 */ 358 #define LDC_COOKIE_PGSZC_MASK 0x7 359 #define LDC_COOKIE_PGSZC_SHIFT 60 360 361 /* 362 * LDC Memory handle 363 */ 364 typedef struct ldc_chan ldc_chan_t; 365 366 typedef struct ldc_mhdl { 367 kmutex_t lock; /* Mutex for memory handle */ 368 ldc_mstatus_t status; /* Memory map status */ 369 370 uint8_t mtype; /* Type of sharing */ 371 uint8_t perm; /* Access permissions */ 372 boolean_t myshadow; /* TRUE=alloc'd shadow mem */ 373 374 ldc_chan_t *ldcp; /* Pointer to channel struct */ 375 ldc_memseg_t *memseg; /* Bound memory segment */ 376 struct ldc_mhdl *next; /* Next memory handle */ 377 } ldc_mhdl_t; 378 379 /* 380 * LDC Descriptor rings 381 */ 382 383 typedef struct ldc_dring { 384 kmutex_t lock; /* Desc ring lock */ 385 ldc_mstatus_t status; /* Desc ring status */ 386 387 uint32_t dsize; /* Descriptor size */ 388 uint32_t length; /* Descriptor ring length */ 389 uint64_t size; /* Desc ring size (in bytes) */ 390 caddr_t base; /* Descriptor ring base addr */ 391 392 ldc_chan_t *ldcp; /* Pointer to bound channel */ 393 ldc_mem_handle_t mhdl; /* Mem handle to desc ring */ 394 395 struct ldc_dring *ch_next; /* Next dring in channel */ 396 struct ldc_dring *next; /* Next dring overall */ 397 398 } ldc_dring_t; 399 400 401 /* 402 * Channel specific information is kept in a separate 403 * structure. These are then stored on a array indexed 404 * by the channel number. 405 */ 406 struct ldc_chan { 407 ldc_chan_t *next; /* Next channel */ 408 409 kmutex_t lock; /* Channel lock */ 410 uint64_t id; /* Channel ID */ 411 ldc_status_t status; /* Channel status */ 412 uint32_t tstate; /* Channel transport state */ 413 uint32_t hstate; /* Channel transport handshake state */ 414 415 ldc_dev_t devclass; /* Associated device class */ 416 uint64_t devinst; /* Associated device instance */ 417 ldc_mode_t mode; /* Channel mode */ 418 419 uint64_t mtu; /* Max TU size (streaming for now) */ 420 421 ldc_ver_t version; /* Channel version */ 422 uint32_t next_vidx; /* Next version to match */ 423 424 uint_t (*cb)(uint64_t event, caddr_t arg); 425 caddr_t cb_arg; /* Channel callback and arg */ 426 boolean_t cb_inprogress; /* Channel callback in progress */ 427 boolean_t cb_enabled; /* Channel callbacks are enabled */ 428 429 boolean_t tx_intr_pending; /* TRUE if Tx interrupts are pending */ 430 boolean_t rx_intr_pending; /* TRUE if Rx interrupts are pending */ 431 432 kmutex_t tx_lock; /* Transmit lock */ 433 uint64_t tx_q_entries; /* Num entries in transmit queue */ 434 uint64_t tx_q_va; /* Virtual addr of transmit queue */ 435 uint64_t tx_q_ra; /* Real addr of transmit queue */ 436 uint64_t tx_head; /* Tx queue head */ 437 uint64_t tx_ackd_head; /* Tx queue ACKd head (Reliable) */ 438 uint64_t tx_tail; /* Tx queue tail */ 439 440 uint64_t rx_q_entries; /* Num entries in receive queue */ 441 uint64_t rx_q_va; /* Virtual addr of receive queue */ 442 uint64_t rx_q_ra; /* Real addr of receive queue */ 443 444 uint64_t link_state; /* Underlying HV channel state */ 445 446 ldc_mtbl_t *mtbl; /* Memory table used by channel */ 447 ldc_mhdl_t *mhdl_list; /* List of memory handles */ 448 kmutex_t mlist_lock; /* Mem handle list lock */ 449 450 ldc_dring_t *exp_dring_list; /* Exported desc ring list */ 451 kmutex_t exp_dlist_lock; /* Lock for exported desc ring list */ 452 ldc_dring_t *imp_dring_list; /* Imported desc ring list */ 453 kmutex_t imp_dlist_lock; /* Lock for imported desc ring list */ 454 455 uint8_t pkt_payload; /* Size of packet payload */ 456 457 uint32_t last_msg_snt; /* Seqid of last packet sent */ 458 uint32_t last_ack_rcd; /* Seqid of last ACK recd */ 459 uint32_t last_msg_rcd; /* Seqid of last packet received */ 460 461 uint32_t stream_remains; /* Number of bytes in stream */ 462 /* packet buffer */ 463 uint32_t stream_offset; /* Offset into packet buffer for */ 464 /* next read */ 465 uint8_t *stream_bufferp; /* Stream packet buffer */ 466 467 int (*read_p)(ldc_chan_t *ldcp, caddr_t bufferp, 468 size_t *sizep); 469 int (*write_p)(ldc_chan_t *ldcp, caddr_t bufferp, 470 size_t *sizep); 471 }; 472 473 474 /* 475 * LDC module soft state structure 476 */ 477 typedef struct ldc_soft_state { 478 kmutex_t lock; /* Protects ldc_soft_state_t */ 479 ldc_cnex_t cinfo; /* channel nexus info */ 480 uint64_t channel_count; /* Number of channels */ 481 uint64_t channels_open; /* Number of open channels */ 482 ldc_chan_t *chan_list; /* List of LDC endpoints */ 483 ldc_dring_t *dring_list; /* Descriptor rings (for export) */ 484 485 kmem_cache_t *memhdl_cache; /* Memory handle cache */ 486 kmem_cache_t *memseg_cache; /* Memory segment cache */ 487 } ldc_soft_state_t; 488 489 #ifdef __cplusplus 490 } 491 #endif 492 493 #endif /* _LDC_IMPL_H */ 494