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 /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */ 22 /* All Rights Reserved */ 23 24 25 /* 26 * Copyright 2010 Sun Microsystems, Inc. All rights reserved. 27 * Use is subject to license terms. 28 */ 29 30 #ifndef _SYS_STRSUBR_H 31 #define _SYS_STRSUBR_H 32 33 /* 34 * WARNING: 35 * Everything in this file is private, belonging to the 36 * STREAMS subsystem. The only guarantee made about the 37 * contents of this file is that if you include it, your 38 * code will not port to the next release. 39 */ 40 #include <sys/stream.h> 41 #include <sys/stropts.h> 42 #include <sys/kstat.h> 43 #include <sys/uio.h> 44 #include <sys/proc.h> 45 #include <sys/netstack.h> 46 #include <sys/modhash.h> 47 48 #ifdef __cplusplus 49 extern "C" { 50 #endif 51 52 /* 53 * In general, the STREAMS locks are disjoint; they are only held 54 * locally, and not simultaneously by a thread. However, module 55 * code, including at the stream head, requires some locks to be 56 * acquired in order for its safety. 57 * 1. Stream level claim. This prevents the value of q_next 58 * from changing while module code is executing. 59 * 2. Queue level claim. This prevents the value of q_ptr 60 * from changing while put or service code is executing. 61 * In addition, it provides for queue single-threading 62 * for QPAIR and PERQ MT-safe modules. 63 * 3. Stream head lock. May be held by the stream head module 64 * to implement a read/write/open/close monitor. 65 * Note: that the only types of twisted stream supported are 66 * the pipe and transports which have read and write service 67 * procedures on both sides of the twist. 68 * 4. Queue lock. May be acquired by utility routines on 69 * behalf of a module. 70 */ 71 72 /* 73 * In general, sd_lock protects the consistency of the stdata 74 * structure. Additionally, it is used with sd_monitor 75 * to implement an open/close monitor. In particular, it protects 76 * the following fields: 77 * sd_iocblk 78 * sd_flag 79 * sd_copyflag 80 * sd_iocid 81 * sd_iocwait 82 * sd_sidp 83 * sd_pgidp 84 * sd_wroff 85 * sd_tail 86 * sd_rerror 87 * sd_werror 88 * sd_pushcnt 89 * sd_sigflags 90 * sd_siglist 91 * sd_pollist 92 * sd_mark 93 * sd_closetime 94 * sd_wakeq 95 * sd_maxblk 96 * 97 * The following fields are modified only by the allocator, which 98 * has exclusive access to them at that time: 99 * sd_wrq 100 * sd_strtab 101 * 102 * The following field is protected by the overlying file system 103 * code, guaranteeing single-threading of opens: 104 * sd_vnode 105 * 106 * Stream-level locks should be acquired before any queue-level locks 107 * are acquired. 108 * 109 * The stream head write queue lock(sd_wrq) is used to protect the 110 * fields qn_maxpsz and qn_minpsz because freezestr() which is 111 * necessary for strqset() only gets the queue lock. 112 */ 113 114 /* 115 * Function types for the parameterized stream head. 116 * The msgfunc_t takes the parameters: 117 * msgfunc(vnode_t *vp, mblk_t *mp, strwakeup_t *wakeups, 118 * strsigset_t *firstmsgsigs, strsigset_t *allmsgsigs, 119 * strpollset_t *pollwakeups); 120 * It returns an optional message to be processed by the stream head. 121 * 122 * The parameters for errfunc_t are: 123 * errfunc(vnode *vp, int ispeek, int *clearerr); 124 * It returns an errno and zero if there was no pending error. 125 */ 126 typedef uint_t strwakeup_t; 127 typedef uint_t strsigset_t; 128 typedef short strpollset_t; 129 typedef uintptr_t callbparams_id_t; 130 typedef mblk_t *(*msgfunc_t)(vnode_t *, mblk_t *, strwakeup_t *, 131 strsigset_t *, strsigset_t *, strpollset_t *); 132 typedef int (*errfunc_t)(vnode_t *, int, int *); 133 134 /* 135 * Per stream sd_lock in putnext may be replaced by per cpu stream_putlocks 136 * each living in a separate cache line. putnext/canputnext grabs only one of 137 * stream_putlocks while strlock() (called on behalf of insertq()/removeq()) 138 * acquires all stream_putlocks. Normally stream_putlocks are only employed 139 * for highly contended streams that have SQ_CIPUT queues in the critical path 140 * (e.g. NFS/UDP stream). 141 * 142 * stream_putlocks are dynamically assigned to stdata structure through 143 * sd_ciputctrl pointer possibly when a stream is already in use. Since 144 * strlock() uses stream_putlocks only under sd_lock acquiring sd_lock when 145 * assigning stream_putlocks to the stream ensures synchronization with 146 * strlock(). 147 * 148 * For lock ordering purposes stream_putlocks are treated as the extension of 149 * sd_lock and are always grabbed right after grabbing sd_lock and released 150 * right before releasing sd_lock except putnext/canputnext where only one of 151 * stream_putlocks locks is used and where it is the first lock to grab. 152 */ 153 154 typedef struct ciputctrl_str { 155 union _ciput_un { 156 uchar_t pad[64]; 157 struct _ciput_str { 158 kmutex_t ciput_lck; 159 ushort_t ciput_cnt; 160 } ciput_str; 161 } ciput_un; 162 } ciputctrl_t; 163 164 #define ciputctrl_lock ciput_un.ciput_str.ciput_lck 165 #define ciputctrl_count ciput_un.ciput_str.ciput_cnt 166 167 /* 168 * Header for a stream: interface to rest of system. 169 * 170 * NOTE: While this is a consolidation-private structure, some unbundled and 171 * third-party products inappropriately make use of some of the fields. 172 * As such, please take care to not gratuitously change any offsets of 173 * existing members. 174 */ 175 typedef struct stdata { 176 struct queue *sd_wrq; /* write queue */ 177 struct msgb *sd_iocblk; /* return block for ioctl */ 178 struct vnode *sd_vnode; /* pointer to associated vnode */ 179 struct streamtab *sd_strtab; /* pointer to streamtab for stream */ 180 uint_t sd_flag; /* state/flags */ 181 uint_t sd_iocid; /* ioctl id */ 182 struct pid *sd_sidp; /* controlling session info */ 183 struct pid *sd_pgidp; /* controlling process group info */ 184 ushort_t sd_tail; /* reserved space in written mblks */ 185 ushort_t sd_wroff; /* write offset */ 186 int sd_rerror; /* error to return on read ops */ 187 int sd_werror; /* error to return on write ops */ 188 int sd_pushcnt; /* number of pushes done on stream */ 189 int sd_sigflags; /* logical OR of all siglist events */ 190 struct strsig *sd_siglist; /* pid linked list to rcv SIGPOLL sig */ 191 struct pollhead sd_pollist; /* list of all pollers to wake up */ 192 struct msgb *sd_mark; /* "marked" message on read queue */ 193 clock_t sd_closetime; /* time to wait to drain q in close */ 194 kmutex_t sd_lock; /* protect head consistency */ 195 kcondvar_t sd_monitor; /* open/close/push/pop monitor */ 196 kcondvar_t sd_iocmonitor; /* ioctl single-threading */ 197 kcondvar_t sd_refmonitor; /* sd_refcnt monitor */ 198 ssize_t sd_qn_minpsz; /* These two fields are a performance */ 199 ssize_t sd_qn_maxpsz; /* enhancements, cache the values in */ 200 /* the stream head so we don't have */ 201 /* to ask the module below the stream */ 202 /* head to get this information. */ 203 struct stdata *sd_mate; /* pointer to twisted stream mate */ 204 kthread_id_t sd_freezer; /* thread that froze stream */ 205 kmutex_t sd_reflock; /* Protects sd_refcnt */ 206 int sd_refcnt; /* number of claimstr */ 207 uint_t sd_wakeq; /* strwakeq()'s copy of sd_flag */ 208 struct queue *sd_struiordq; /* sync barrier struio() read queue */ 209 struct queue *sd_struiowrq; /* sync barrier struio() write queue */ 210 char sd_struiodnak; /* defer NAK of M_IOCTL by rput() */ 211 struct msgb *sd_struionak; /* pointer M_IOCTL mblk(s) to NAK */ 212 caddr_t sd_t_audit_data; /* For audit purposes only */ 213 ssize_t sd_maxblk; /* maximum message block size */ 214 uint_t sd_rput_opt; /* options/flags for strrput */ 215 uint_t sd_wput_opt; /* options/flags for write/putmsg */ 216 uint_t sd_read_opt; /* options/flags for strread */ 217 msgfunc_t sd_rprotofunc; /* rput M_*PROTO routine */ 218 msgfunc_t sd_rputdatafunc; /* read M_DATA routine */ 219 msgfunc_t sd_rmiscfunc; /* rput routine (non-data/proto) */ 220 msgfunc_t sd_wputdatafunc; /* wput M_DATA routine */ 221 errfunc_t sd_rderrfunc; /* read side error callback */ 222 errfunc_t sd_wrerrfunc; /* write side error callback */ 223 /* 224 * support for low contention concurrent putnext. 225 */ 226 ciputctrl_t *sd_ciputctrl; 227 uint_t sd_nciputctrl; 228 229 int sd_anchor; /* position of anchor in stream */ 230 /* 231 * Service scheduling at the stream head. 232 */ 233 kmutex_t sd_qlock; 234 struct queue *sd_qhead; /* Head of queues to be serviced. */ 235 struct queue *sd_qtail; /* Tail of queues to be serviced. */ 236 void *sd_servid; /* Service ID for bckgrnd schedule */ 237 ushort_t sd_svcflags; /* Servicing flags */ 238 short sd_nqueues; /* Number of queues in the list */ 239 kcondvar_t sd_qcv; /* Waiters for qhead to become empty */ 240 kcondvar_t sd_zcopy_wait; 241 uint_t sd_copyflag; /* copy-related flags */ 242 zoneid_t sd_anchorzone; /* Allow removal from same zone only */ 243 struct msgb *sd_cmdblk; /* reply from _I_CMD */ 244 } stdata_t; 245 246 /* 247 * stdata servicing flags. 248 */ 249 #define STRS_WILLSERVICE 0x01 250 #define STRS_SCHEDULED 0x02 251 252 #define STREAM_NEEDSERVICE(stp) ((stp)->sd_qhead != NULL) 253 254 /* 255 * stdata flag field defines 256 */ 257 #define IOCWAIT 0x00000001 /* Someone is doing an ioctl */ 258 #define RSLEEP 0x00000002 /* Someone wants to read/recv msg */ 259 #define WSLEEP 0x00000004 /* Someone wants to write */ 260 #define STRPRI 0x00000008 /* An M_PCPROTO is at stream head */ 261 #define STRHUP 0x00000010 /* Device has vanished */ 262 #define STWOPEN 0x00000020 /* waiting for 1st open */ 263 #define STPLEX 0x00000040 /* stream is being multiplexed */ 264 #define STRISTTY 0x00000080 /* stream is a terminal */ 265 #define STRGETINPROG 0x00000100 /* (k)strgetmsg is running */ 266 #define IOCWAITNE 0x00000200 /* STR_NOERROR ioctl running */ 267 #define STRDERR 0x00000400 /* fatal read error from M_ERROR */ 268 #define STWRERR 0x00000800 /* fatal write error from M_ERROR */ 269 #define STRDERRNONPERSIST 0x00001000 /* nonpersistent read errors */ 270 #define STWRERRNONPERSIST 0x00002000 /* nonpersistent write errors */ 271 #define STRCLOSE 0x00004000 /* wait for a close to complete */ 272 #define SNDMREAD 0x00008000 /* used for read notification */ 273 #define OLDNDELAY 0x00010000 /* use old TTY semantics for */ 274 /* NDELAY reads and writes */ 275 /* 0x00020000 unused */ 276 /* 0x00040000 unused */ 277 #define STRTOSTOP 0x00080000 /* block background writes */ 278 #define STRCMDWAIT 0x00100000 /* someone is doing an _I_CMD */ 279 /* 0x00200000 unused */ 280 #define STRMOUNT 0x00400000 /* stream is mounted */ 281 #define STRNOTATMARK 0x00800000 /* Not at mark (when empty read q) */ 282 #define STRDELIM 0x01000000 /* generate delimited messages */ 283 #define STRATMARK 0x02000000 /* At mark (due to MSGMARKNEXT) */ 284 #define STZCNOTIFY 0x04000000 /* wait for zerocopy mblk to be acked */ 285 #define STRPLUMB 0x08000000 /* push/pop pending */ 286 #define STREOF 0x10000000 /* End-of-file indication */ 287 #define STREOPENFAIL 0x20000000 /* indicates if re-open has failed */ 288 #define STRMATE 0x40000000 /* this stream is a mate */ 289 #define STRHASLINKS 0x80000000 /* I_LINKs under this stream */ 290 291 /* 292 * Copy-related flags (sd_copyflag), set by SO_COPYOPT. 293 */ 294 #define STZCVMSAFE 0x00000001 /* safe to borrow file (segmapped) */ 295 /* pages instead of bcopy */ 296 #define STZCVMUNSAFE 0x00000002 /* unsafe to borrow file pages */ 297 #define STRCOPYCACHED 0x00000004 /* copy should NOT bypass cache */ 298 299 /* 300 * Options and flags for strrput (sd_rput_opt) 301 */ 302 #define SR_POLLIN 0x00000001 /* pollwakeup needed for band0 data */ 303 #define SR_SIGALLDATA 0x00000002 /* Send SIGPOLL for all M_DATA */ 304 #define SR_CONSOL_DATA 0x00000004 /* Consolidate M_DATA onto q_last */ 305 #define SR_IGN_ZEROLEN 0x00000008 /* Ignore zero-length M_DATA */ 306 307 /* 308 * Options and flags for strwrite/strputmsg (sd_wput_opt) 309 */ 310 #define SW_SIGPIPE 0x00000001 /* Send SIGPIPE for write error */ 311 #define SW_RECHECK_ERR 0x00000002 /* Recheck errors in strwrite loop */ 312 #define SW_SNDZERO 0x00000004 /* send 0-length msg down pipe/FIFO */ 313 314 /* 315 * Options and flags for strread (sd_read_opt) 316 */ 317 #define RD_MSGDIS 0x00000001 /* read msg discard */ 318 #define RD_MSGNODIS 0x00000002 /* read msg no discard */ 319 #define RD_PROTDAT 0x00000004 /* read M_[PC]PROTO contents as data */ 320 #define RD_PROTDIS 0x00000008 /* discard M_[PC]PROTO blocks and */ 321 /* retain data blocks */ 322 /* 323 * Flags parameter for strsetrputhooks() and strsetwputhooks(). 324 * These flags define the interface for setting the above internal 325 * flags in sd_rput_opt and sd_wput_opt. 326 */ 327 #define SH_CONSOL_DATA 0x00000001 /* Consolidate M_DATA onto q_last */ 328 #define SH_SIGALLDATA 0x00000002 /* Send SIGPOLL for all M_DATA */ 329 #define SH_IGN_ZEROLEN 0x00000004 /* Drop zero-length M_DATA */ 330 331 #define SH_SIGPIPE 0x00000100 /* Send SIGPIPE for write error */ 332 #define SH_RECHECK_ERR 0x00000200 /* Recheck errors in strwrite loop */ 333 334 /* 335 * Each queue points to a sync queue (the inner perimeter) which keeps 336 * track of the number of threads that are inside a given queue (sq_count) 337 * and also is used to implement the asynchronous putnext 338 * (by queuing messages if the queue can not be entered.) 339 * 340 * Messages are queued on sq_head/sq_tail including deferred qwriter(INNER) 341 * messages. The sq_head/sq_tail list is a singly-linked list with 342 * b_queue recording the queue and b_prev recording the function to 343 * be called (either the put procedure or a qwriter callback function.) 344 * 345 * The sq_count counter tracks the number of threads that are 346 * executing inside the perimeter or (in the case of outer perimeters) 347 * have some work queued for them relating to the perimeter. The sq_rmqcount 348 * counter tracks the subset which are in removeq() (usually invoked from 349 * qprocsoff(9F)). 350 * 351 * In addition a module writer can declare that the module has an outer 352 * perimeter (by setting D_MTOUTPERIM) in which case all inner perimeter 353 * syncq's for the module point (through sq_outer) to an outer perimeter 354 * syncq. The outer perimeter consists of the doubly linked list (sq_onext and 355 * sq_oprev) linking all the inner perimeter syncq's with out outer perimeter 356 * syncq. This is used to implement qwriter(OUTER) (an asynchronous way of 357 * getting exclusive access at the outer perimeter) and outer_enter/exit 358 * which are used by the framework to acquire exclusive access to the outer 359 * perimeter during open and close of modules that have set D_MTOUTPERIM. 360 * 361 * In the inner perimeter case sq_save is available for use by machine 362 * dependent code. sq_head/sq_tail are used to queue deferred messages on 363 * the inner perimeter syncqs and to queue become_writer requests on the 364 * outer perimeter syncqs. 365 * 366 * Note: machine dependent optimized versions of putnext may depend 367 * on the order of sq_flags and sq_count (so that they can e.g. 368 * read these two fields in a single load instruction.) 369 * 370 * Per perimeter SQLOCK/sq_count in putnext/put may be replaced by per cpu 371 * sq_putlocks/sq_putcounts each living in a separate cache line. Obviously 372 * sq_putlock[x] protects sq_putcount[x]. putnext/put routine will grab only 1 373 * of sq_putlocks and update only 1 of sq_putcounts. strlock() and many 374 * other routines in strsubr.c and ddi.c will grab all sq_putlocks (as well as 375 * SQLOCK) and figure out the count value as the sum of sq_count and all of 376 * sq_putcounts. The idea is to make critical fast path -- putnext -- much 377 * faster at the expense of much less often used slower path like 378 * strlock(). One known case where entersq/strlock is executed pretty often is 379 * SpecWeb but since IP is SQ_CIOC and socket TCP/IP stream is nextless 380 * there's no need to grab multiple sq_putlocks and look at sq_putcounts. See 381 * strsubr.c for more comments. 382 * 383 * Note regular SQLOCK and sq_count are still used in many routines 384 * (e.g. entersq(), rwnext()) in the same way as before sq_putlocks were 385 * introduced. 386 * 387 * To understand when all sq_putlocks need to be held and all sq_putcounts 388 * need to be added up one needs to look closely at putnext code. Basically if 389 * a routine like e.g. wait_syncq() needs to be sure that perimeter is empty 390 * all sq_putlocks/sq_putcounts need to be held/added up. On the other hand 391 * there's no need to hold all sq_putlocks and count all sq_putcounts in 392 * routines like leavesq()/dropsq() and etc. since the are usually exit 393 * counterparts of entersq/outer_enter() and etc. which have already either 394 * prevented put entry poins from executing or did not care about put 395 * entrypoints. entersq() doesn't need to care about sq_putlocks/sq_putcounts 396 * if the entry point has a shared access since put has the highest degree of 397 * concurrency and such entersq() does not intend to block out put 398 * entrypoints. 399 * 400 * Before sq_putcounts were introduced the standard way to wait for perimeter 401 * to become empty was: 402 * 403 * mutex_enter(SQLOCK(sq)); 404 * while (sq->sq_count > 0) { 405 * sq->sq_flags |= SQ_WANTWAKEUP; 406 * cv_wait(&sq->sq_wait, SQLOCK(sq)); 407 * } 408 * mutex_exit(SQLOCK(sq)); 409 * 410 * The new way is: 411 * 412 * mutex_enter(SQLOCK(sq)); 413 * count = sq->sq_count; 414 * SQ_PUTLOCKS_ENTER(sq); 415 * SUM_SQ_PUTCOUNTS(sq, count); 416 * while (count != 0) { 417 * sq->sq_flags |= SQ_WANTWAKEUP; 418 * SQ_PUTLOCKS_EXIT(sq); 419 * cv_wait(&sq->sq_wait, SQLOCK(sq)); 420 * count = sq->sq_count; 421 * SQ_PUTLOCKS_ENTER(sq); 422 * SUM_SQ_PUTCOUNTS(sq, count); 423 * } 424 * SQ_PUTLOCKS_EXIT(sq); 425 * mutex_exit(SQLOCK(sq)); 426 * 427 * Note that SQ_WANTWAKEUP is set before dropping SQ_PUTLOCKS. This makes sure 428 * putnext won't skip a wakeup. 429 * 430 * sq_putlocks are treated as the extension of SQLOCK for lock ordering 431 * purposes and are always grabbed right after grabbing SQLOCK and released 432 * right before releasing SQLOCK. This also allows dynamic creation of 433 * sq_putlocks while holding SQLOCK (by making sq_ciputctrl non null even when 434 * the stream is already in use). Only in putnext one of sq_putlocks 435 * is grabbed instead of SQLOCK. putnext return path remembers what counter it 436 * incremented and decrements the right counter on its way out. 437 */ 438 439 struct syncq { 440 kmutex_t sq_lock; /* atomic access to syncq */ 441 uint16_t sq_count; /* # threads inside */ 442 uint16_t sq_flags; /* state and some type info */ 443 /* 444 * Distributed syncq scheduling 445 * The list of queue's is handled by sq_head and 446 * sq_tail fields. 447 * 448 * The list of events is handled by the sq_evhead and sq_evtail 449 * fields. 450 */ 451 queue_t *sq_head; /* queue of deferred messages */ 452 queue_t *sq_tail; /* queue of deferred messages */ 453 mblk_t *sq_evhead; /* Event message on the syncq */ 454 mblk_t *sq_evtail; 455 uint_t sq_nqueues; /* # of queues on this sq */ 456 /* 457 * Concurrency and condition variables 458 */ 459 uint16_t sq_type; /* type (concurrency) of syncq */ 460 uint16_t sq_rmqcount; /* # threads inside removeq() */ 461 kcondvar_t sq_wait; /* block on this sync queue */ 462 kcondvar_t sq_exitwait; /* waiting for thread to leave the */ 463 /* inner perimeter */ 464 /* 465 * Handling synchronous callbacks such as qtimeout and qbufcall 466 */ 467 ushort_t sq_callbflags; /* flags for callback synchronization */ 468 callbparams_id_t sq_cancelid; /* id of callback being cancelled */ 469 struct callbparams *sq_callbpend; /* Pending callbacks */ 470 471 /* 472 * Links forming an outer perimeter from one outer syncq and 473 * a set of inner sync queues. 474 */ 475 struct syncq *sq_outer; /* Pointer to outer perimeter */ 476 struct syncq *sq_onext; /* Linked list of syncq's making */ 477 struct syncq *sq_oprev; /* up the outer perimeter. */ 478 /* 479 * support for low contention concurrent putnext. 480 */ 481 ciputctrl_t *sq_ciputctrl; 482 uint_t sq_nciputctrl; 483 /* 484 * Counter for the number of threads wanting to become exclusive. 485 */ 486 uint_t sq_needexcl; 487 /* 488 * These two fields are used for scheduling a syncq for 489 * background processing. The sq_svcflag is protected by 490 * SQLOCK lock. 491 */ 492 struct syncq *sq_next; /* for syncq scheduling */ 493 void * sq_servid; 494 uint_t sq_servcount; /* # pending background threads */ 495 uint_t sq_svcflags; /* Scheduling flags */ 496 clock_t sq_tstamp; /* Time when was enabled */ 497 /* 498 * Maximum priority of the queues on this syncq. 499 */ 500 pri_t sq_pri; 501 }; 502 typedef struct syncq syncq_t; 503 504 /* 505 * sync queue scheduling flags (for sq_svcflags). 506 */ 507 #define SQ_SERVICE 0x1 /* being serviced */ 508 #define SQ_BGTHREAD 0x2 /* awaiting service by bg thread */ 509 #define SQ_DISABLED 0x4 /* don't put syncq in service list */ 510 511 /* 512 * FASTPUT bit in sd_count/putcount. 513 */ 514 #define SQ_FASTPUT 0x8000 515 #define SQ_FASTMASK 0x7FFF 516 517 /* 518 * sync queue state flags 519 */ 520 #define SQ_EXCL 0x0001 /* exclusive access to inner */ 521 /* perimeter */ 522 #define SQ_BLOCKED 0x0002 /* qprocsoff */ 523 #define SQ_FROZEN 0x0004 /* freezestr */ 524 #define SQ_WRITER 0x0008 /* qwriter(OUTER) pending or running */ 525 #define SQ_MESSAGES 0x0010 /* messages on syncq */ 526 #define SQ_WANTWAKEUP 0x0020 /* do cv_broadcast on sq_wait */ 527 #define SQ_WANTEXWAKEUP 0x0040 /* do cv_broadcast on sq_exitwait */ 528 #define SQ_EVENTS 0x0080 /* Events pending */ 529 #define SQ_QUEUED (SQ_MESSAGES | SQ_EVENTS) 530 #define SQ_FLAGMASK 0x00FF 531 532 /* 533 * Test a queue to see if inner perimeter is exclusive. 534 */ 535 #define PERIM_EXCL(q) ((q)->q_syncq->sq_flags & SQ_EXCL) 536 537 /* 538 * If any of these flags are set it is not possible for a thread to 539 * enter a put or service procedure. Instead it must either block 540 * or put the message on the syncq. 541 */ 542 #define SQ_GOAWAY (SQ_EXCL|SQ_BLOCKED|SQ_FROZEN|SQ_WRITER|\ 543 SQ_QUEUED) 544 /* 545 * If any of these flags are set it not possible to drain the syncq 546 */ 547 #define SQ_STAYAWAY (SQ_BLOCKED|SQ_FROZEN|SQ_WRITER) 548 549 /* 550 * Flags to trigger syncq tail processing. 551 */ 552 #define SQ_TAIL (SQ_QUEUED|SQ_WANTWAKEUP|SQ_WANTEXWAKEUP) 553 554 /* 555 * Syncq types (stored in sq_type) 556 * The SQ_TYPES_IN_FLAGS (ciput) are also stored in sq_flags 557 * for performance reasons. Thus these type values have to be in the low 558 * 16 bits and not conflict with the sq_flags values above. 559 * 560 * Notes: 561 * - putnext() and put() assume that the put procedures have the highest 562 * degree of concurrency. Thus if any of the SQ_CI* are set then SQ_CIPUT 563 * has to be set. This restriction can be lifted by adding code to putnext 564 * and put that check that sq_count == 0 like entersq does. 565 * - putnext() and put() does currently not handle !SQ_COPUT 566 * - In order to implement !SQ_COCB outer_enter has to be fixed so that 567 * the callback can be cancelled while cv_waiting in outer_enter. 568 * - If SQ_CISVC needs to be implemented, qprocsoff() needs to wait 569 * for the currently running services to stop (wait for QINSERVICE 570 * to go off). disable_svc called from qprcosoff disables only 571 * services that will be run in future. 572 * 573 * All the SQ_CO flags are set when there is no outer perimeter. 574 */ 575 #define SQ_CIPUT 0x0100 /* Concurrent inner put proc */ 576 #define SQ_CISVC 0x0200 /* Concurrent inner svc proc */ 577 #define SQ_CIOC 0x0400 /* Concurrent inner open/close */ 578 #define SQ_CICB 0x0800 /* Concurrent inner callback */ 579 #define SQ_COPUT 0x1000 /* Concurrent outer put proc */ 580 #define SQ_COSVC 0x2000 /* Concurrent outer svc proc */ 581 #define SQ_COOC 0x4000 /* Concurrent outer open/close */ 582 #define SQ_COCB 0x8000 /* Concurrent outer callback */ 583 584 /* Types also kept in sq_flags for performance */ 585 #define SQ_TYPES_IN_FLAGS (SQ_CIPUT) 586 587 #define SQ_CI (SQ_CIPUT|SQ_CISVC|SQ_CIOC|SQ_CICB) 588 #define SQ_CO (SQ_COPUT|SQ_COSVC|SQ_COOC|SQ_COCB) 589 #define SQ_TYPEMASK (SQ_CI|SQ_CO) 590 591 /* 592 * Flag combinations passed to entersq and leavesq to specify the type 593 * of entry point. 594 */ 595 #define SQ_PUT (SQ_CIPUT|SQ_COPUT) 596 #define SQ_SVC (SQ_CISVC|SQ_COSVC) 597 #define SQ_OPENCLOSE (SQ_CIOC|SQ_COOC) 598 #define SQ_CALLBACK (SQ_CICB|SQ_COCB) 599 600 /* 601 * Other syncq types which are not copied into flags. 602 */ 603 #define SQ_PERMOD 0x01 /* Syncq is PERMOD */ 604 605 /* 606 * Asynchronous callback qun*** flag. 607 * The mechanism these flags are used in is one where callbacks enter 608 * the perimeter thanks to framework support. To use this mechanism 609 * the q* and qun* flavors of the callback routines must be used. 610 * e.g. qtimeout and quntimeout. The synchronization provided by the flags 611 * avoids deadlocks between blocking qun* routines and the perimeter 612 * lock. 613 */ 614 #define SQ_CALLB_BYPASSED 0x01 /* bypassed callback fn */ 615 616 /* 617 * Cancel callback mask. 618 * The mask expands as the number of cancelable callback types grows 619 * Note - separate callback flag because different callbacks have 620 * overlapping id space. 621 */ 622 #define SQ_CALLB_CANCEL_MASK (SQ_CANCEL_TOUT|SQ_CANCEL_BUFCALL) 623 624 #define SQ_CANCEL_TOUT 0x02 /* cancel timeout request */ 625 #define SQ_CANCEL_BUFCALL 0x04 /* cancel bufcall request */ 626 627 typedef struct callbparams { 628 syncq_t *cbp_sq; 629 void (*cbp_func)(void *); 630 void *cbp_arg; 631 callbparams_id_t cbp_id; 632 uint_t cbp_flags; 633 struct callbparams *cbp_next; 634 size_t cbp_size; 635 } callbparams_t; 636 637 typedef struct strbufcall { 638 void (*bc_func)(void *); 639 void *bc_arg; 640 size_t bc_size; 641 bufcall_id_t bc_id; 642 struct strbufcall *bc_next; 643 kthread_id_t bc_executor; 644 } strbufcall_t; 645 646 /* 647 * Structure of list of processes to be sent SIGPOLL/SIGURG signal 648 * on request. The valid S_* events are defined in stropts.h. 649 */ 650 typedef struct strsig { 651 struct pid *ss_pidp; /* pid/pgrp pointer */ 652 pid_t ss_pid; /* positive pid, negative pgrp */ 653 int ss_events; /* S_* events */ 654 struct strsig *ss_next; 655 } strsig_t; 656 657 /* 658 * bufcall list 659 */ 660 struct bclist { 661 strbufcall_t *bc_head; 662 strbufcall_t *bc_tail; 663 }; 664 665 /* 666 * Structure used to track mux links and unlinks. 667 */ 668 struct mux_node { 669 major_t mn_imaj; /* internal major device number */ 670 uint16_t mn_indegree; /* number of incoming edges */ 671 struct mux_node *mn_originp; /* where we came from during search */ 672 struct mux_edge *mn_startp; /* where search left off in mn_outp */ 673 struct mux_edge *mn_outp; /* list of outgoing edges */ 674 uint_t mn_flags; /* see below */ 675 }; 676 677 /* 678 * Flags for mux_nodes. 679 */ 680 #define VISITED 1 681 682 /* 683 * Edge structure - a list of these is hung off the 684 * mux_node to represent the outgoing edges. 685 */ 686 struct mux_edge { 687 struct mux_node *me_nodep; /* edge leads to this node */ 688 struct mux_edge *me_nextp; /* next edge */ 689 int me_muxid; /* id of link */ 690 dev_t me_dev; /* dev_t - used for kernel PUNLINK */ 691 }; 692 693 /* 694 * Queue info 695 * 696 * The syncq is included here to reduce memory fragmentation 697 * for kernel memory allocators that only allocate in sizes that are 698 * powers of two. If the kernel memory allocator changes this should 699 * be revisited. 700 */ 701 typedef struct queinfo { 702 struct queue qu_rqueue; /* read queue - must be first */ 703 struct queue qu_wqueue; /* write queue - must be second */ 704 struct syncq qu_syncq; /* syncq - must be third */ 705 } queinfo_t; 706 707 /* 708 * Multiplexed streams info 709 */ 710 typedef struct linkinfo { 711 struct linkblk li_lblk; /* must be first */ 712 struct file *li_fpdown; /* file pointer for lower stream */ 713 struct linkinfo *li_next; /* next in list */ 714 struct linkinfo *li_prev; /* previous in list */ 715 } linkinfo_t; 716 717 /* 718 * List of syncq's used by freeezestr/unfreezestr 719 */ 720 typedef struct syncql { 721 struct syncql *sql_next; 722 syncq_t *sql_sq; 723 } syncql_t; 724 725 typedef struct sqlist { 726 syncql_t *sqlist_head; 727 size_t sqlist_size; /* structure size in bytes */ 728 size_t sqlist_index; /* next free entry in array */ 729 syncql_t sqlist_array[4]; /* 4 or more entries */ 730 } sqlist_t; 731 732 typedef struct perdm { 733 struct perdm *dm_next; 734 syncq_t *dm_sq; 735 struct streamtab *dm_str; 736 uint_t dm_ref; 737 } perdm_t; 738 739 #define NEED_DM(dmp, qflag) \ 740 (dmp == NULL && (qflag & (QPERMOD | QMTOUTPERIM))) 741 742 /* 743 * fmodsw_impl_t is used within the kernel. fmodsw is used by 744 * the modules/drivers. The information is copied from fmodsw 745 * defined in the module/driver into the fmodsw_impl_t structure 746 * during the module/driver initialization. 747 */ 748 typedef struct fmodsw_impl fmodsw_impl_t; 749 750 struct fmodsw_impl { 751 fmodsw_impl_t *f_next; 752 char f_name[FMNAMESZ + 1]; 753 struct streamtab *f_str; 754 uint32_t f_qflag; 755 uint32_t f_sqtype; 756 perdm_t *f_dmp; 757 uint32_t f_ref; 758 uint32_t f_hits; 759 }; 760 761 typedef enum { 762 FMODSW_HOLD = 0x00000001, 763 FMODSW_LOAD = 0x00000002 764 } fmodsw_flags_t; 765 766 typedef struct cdevsw_impl { 767 struct streamtab *d_str; 768 uint32_t d_qflag; 769 uint32_t d_sqtype; 770 perdm_t *d_dmp; 771 } cdevsw_impl_t; 772 773 /* 774 * Enumeration of the types of access that can be requested for a 775 * controlling terminal under job control. 776 */ 777 enum jcaccess { 778 JCREAD, /* read data on a ctty */ 779 JCWRITE, /* write data to a ctty */ 780 JCSETP, /* set ctty parameters */ 781 JCGETP /* get ctty parameters */ 782 }; 783 784 struct str_stack { 785 netstack_t *ss_netstack; /* Common netstack */ 786 787 kmutex_t ss_sad_lock; /* autopush lock */ 788 mod_hash_t *ss_sad_hash; 789 size_t ss_sad_hash_nchains; 790 struct saddev *ss_saddev; /* sad device array */ 791 int ss_sadcnt; /* number of sad devices */ 792 793 int ss_devcnt; /* number of mux_nodes */ 794 struct mux_node *ss_mux_nodes; /* mux info for cycle checking */ 795 }; 796 typedef struct str_stack str_stack_t; 797 798 /* 799 * Finding related queues 800 */ 801 #define STREAM(q) ((q)->q_stream) 802 #define SQ(rq) ((syncq_t *)((rq) + 2)) 803 804 /* 805 * Get the module/driver name for a queue. Since some queues don't have 806 * q_info structures (e.g., see log_makeq()), fall back to "?". 807 */ 808 #define Q2NAME(q) \ 809 (((q)->q_qinfo != NULL && (q)->q_qinfo->qi_minfo->mi_idname != NULL) ? \ 810 (q)->q_qinfo->qi_minfo->mi_idname : "?") 811 812 /* 813 * Locking macros 814 */ 815 #define QLOCK(q) (&(q)->q_lock) 816 #define SQLOCK(sq) (&(sq)->sq_lock) 817 818 #define STREAM_PUTLOCKS_ENTER(stp) { \ 819 ASSERT(MUTEX_HELD(&(stp)->sd_lock)); \ 820 if ((stp)->sd_ciputctrl != NULL) { \ 821 int i; \ 822 int nlocks = (stp)->sd_nciputctrl; \ 823 ciputctrl_t *cip = (stp)->sd_ciputctrl; \ 824 for (i = 0; i <= nlocks; i++) { \ 825 mutex_enter(&cip[i].ciputctrl_lock); \ 826 } \ 827 } \ 828 } 829 830 #define STREAM_PUTLOCKS_EXIT(stp) { \ 831 ASSERT(MUTEX_HELD(&(stp)->sd_lock)); \ 832 if ((stp)->sd_ciputctrl != NULL) { \ 833 int i; \ 834 int nlocks = (stp)->sd_nciputctrl; \ 835 ciputctrl_t *cip = (stp)->sd_ciputctrl; \ 836 for (i = 0; i <= nlocks; i++) { \ 837 mutex_exit(&cip[i].ciputctrl_lock); \ 838 } \ 839 } \ 840 } 841 842 #define SQ_PUTLOCKS_ENTER(sq) { \ 843 ASSERT(MUTEX_HELD(SQLOCK(sq))); \ 844 if ((sq)->sq_ciputctrl != NULL) { \ 845 int i; \ 846 int nlocks = (sq)->sq_nciputctrl; \ 847 ciputctrl_t *cip = (sq)->sq_ciputctrl; \ 848 ASSERT((sq)->sq_type & SQ_CIPUT); \ 849 for (i = 0; i <= nlocks; i++) { \ 850 mutex_enter(&cip[i].ciputctrl_lock); \ 851 } \ 852 } \ 853 } 854 855 #define SQ_PUTLOCKS_EXIT(sq) { \ 856 ASSERT(MUTEX_HELD(SQLOCK(sq))); \ 857 if ((sq)->sq_ciputctrl != NULL) { \ 858 int i; \ 859 int nlocks = (sq)->sq_nciputctrl; \ 860 ciputctrl_t *cip = (sq)->sq_ciputctrl; \ 861 ASSERT((sq)->sq_type & SQ_CIPUT); \ 862 for (i = 0; i <= nlocks; i++) { \ 863 mutex_exit(&cip[i].ciputctrl_lock); \ 864 } \ 865 } \ 866 } 867 868 #define SQ_PUTCOUNT_SETFAST(sq) { \ 869 ASSERT(MUTEX_HELD(SQLOCK(sq))); \ 870 if ((sq)->sq_ciputctrl != NULL) { \ 871 int i; \ 872 int nlocks = (sq)->sq_nciputctrl; \ 873 ciputctrl_t *cip = (sq)->sq_ciputctrl; \ 874 ASSERT((sq)->sq_type & SQ_CIPUT); \ 875 for (i = 0; i <= nlocks; i++) { \ 876 mutex_enter(&cip[i].ciputctrl_lock); \ 877 cip[i].ciputctrl_count |= SQ_FASTPUT; \ 878 mutex_exit(&cip[i].ciputctrl_lock); \ 879 } \ 880 } \ 881 } 882 883 #define SQ_PUTCOUNT_CLRFAST(sq) { \ 884 ASSERT(MUTEX_HELD(SQLOCK(sq))); \ 885 if ((sq)->sq_ciputctrl != NULL) { \ 886 int i; \ 887 int nlocks = (sq)->sq_nciputctrl; \ 888 ciputctrl_t *cip = (sq)->sq_ciputctrl; \ 889 ASSERT((sq)->sq_type & SQ_CIPUT); \ 890 for (i = 0; i <= nlocks; i++) { \ 891 mutex_enter(&cip[i].ciputctrl_lock); \ 892 cip[i].ciputctrl_count &= ~SQ_FASTPUT; \ 893 mutex_exit(&cip[i].ciputctrl_lock); \ 894 } \ 895 } \ 896 } 897 898 899 #ifdef DEBUG 900 901 #define SQ_PUTLOCKS_HELD(sq) { \ 902 ASSERT(MUTEX_HELD(SQLOCK(sq))); \ 903 if ((sq)->sq_ciputctrl != NULL) { \ 904 int i; \ 905 int nlocks = (sq)->sq_nciputctrl; \ 906 ciputctrl_t *cip = (sq)->sq_ciputctrl; \ 907 ASSERT((sq)->sq_type & SQ_CIPUT); \ 908 for (i = 0; i <= nlocks; i++) { \ 909 ASSERT(MUTEX_HELD(&cip[i].ciputctrl_lock)); \ 910 } \ 911 } \ 912 } 913 914 #define SUMCHECK_SQ_PUTCOUNTS(sq, countcheck) { \ 915 if ((sq)->sq_ciputctrl != NULL) { \ 916 int i; \ 917 uint_t count = 0; \ 918 int ncounts = (sq)->sq_nciputctrl; \ 919 ASSERT((sq)->sq_type & SQ_CIPUT); \ 920 for (i = 0; i <= ncounts; i++) { \ 921 count += \ 922 (((sq)->sq_ciputctrl[i].ciputctrl_count) & \ 923 SQ_FASTMASK); \ 924 } \ 925 ASSERT(count == (countcheck)); \ 926 } \ 927 } 928 929 #define SUMCHECK_CIPUTCTRL_COUNTS(ciput, nciput, countcheck) { \ 930 int i; \ 931 uint_t count = 0; \ 932 ASSERT((ciput) != NULL); \ 933 for (i = 0; i <= (nciput); i++) { \ 934 count += (((ciput)[i].ciputctrl_count) & \ 935 SQ_FASTMASK); \ 936 } \ 937 ASSERT(count == (countcheck)); \ 938 } 939 940 #else /* DEBUG */ 941 942 #define SQ_PUTLOCKS_HELD(sq) 943 #define SUMCHECK_SQ_PUTCOUNTS(sq, countcheck) 944 #define SUMCHECK_CIPUTCTRL_COUNTS(sq, nciput, countcheck) 945 946 #endif /* DEBUG */ 947 948 #define SUM_SQ_PUTCOUNTS(sq, count) { \ 949 if ((sq)->sq_ciputctrl != NULL) { \ 950 int i; \ 951 int ncounts = (sq)->sq_nciputctrl; \ 952 ciputctrl_t *cip = (sq)->sq_ciputctrl; \ 953 ASSERT((sq)->sq_type & SQ_CIPUT); \ 954 for (i = 0; i <= ncounts; i++) { \ 955 (count) += ((cip[i].ciputctrl_count) & \ 956 SQ_FASTMASK); \ 957 } \ 958 } \ 959 } 960 961 #define CLAIM_QNEXT_LOCK(stp) mutex_enter(&(stp)->sd_lock) 962 #define RELEASE_QNEXT_LOCK(stp) mutex_exit(&(stp)->sd_lock) 963 964 /* 965 * syncq message manipulation macros. 966 */ 967 /* 968 * Put a message on the queue syncq. 969 * Assumes QLOCK held. 970 */ 971 #define SQPUT_MP(qp, mp) \ 972 { \ 973 qp->q_syncqmsgs++; \ 974 if (qp->q_sqhead == NULL) { \ 975 qp->q_sqhead = qp->q_sqtail = mp; \ 976 } else { \ 977 qp->q_sqtail->b_next = mp; \ 978 qp->q_sqtail = mp; \ 979 } \ 980 set_qfull(qp); \ 981 } 982 983 /* 984 * Miscellaneous parameters and flags. 985 */ 986 987 /* 988 * Default timeout in milliseconds for ioctls and close 989 */ 990 #define STRTIMOUT 15000 991 992 /* 993 * Flag values for stream io 994 */ 995 #define WRITEWAIT 0x1 /* waiting for write event */ 996 #define READWAIT 0x2 /* waiting for read event */ 997 #define NOINTR 0x4 /* error is not to be set for signal */ 998 #define GETWAIT 0x8 /* waiting for getmsg event */ 999 1000 /* 1001 * These flags need to be unique for stream io name space 1002 * and copy modes name space. These flags allow strwaitq 1003 * and strdoioctl to proceed as if signals or errors on the stream 1004 * head have not occurred; i.e. they will be detected by some other 1005 * means. 1006 * STR_NOSIG does not allow signals to interrupt the call 1007 * STR_NOERROR does not allow stream head read, write or hup errors to 1008 * affect the call. When used with strdoioctl(), if a previous ioctl 1009 * is pending and times out, STR_NOERROR will cause strdoioctl() to not 1010 * return ETIME. If, however, the requested ioctl times out, ETIME 1011 * will be returned (use ic_timout instead) 1012 * STR_PEEK is used to inform strwaitq that the reader is peeking at data 1013 * and that a non-persistent error should not be cleared. 1014 * STR_DELAYERR is used to inform strwaitq that it should not check errors 1015 * after being awoken since, in addition to an error, there might also be 1016 * data queued on the stream head read queue. 1017 */ 1018 #define STR_NOSIG 0x10 /* Ignore signals during strdoioctl/strwaitq */ 1019 #define STR_NOERROR 0x20 /* Ignore errors during strdoioctl/strwaitq */ 1020 #define STR_PEEK 0x40 /* Peeking behavior on non-persistent errors */ 1021 #define STR_DELAYERR 0x80 /* Do not check errors on return */ 1022 1023 /* 1024 * Copy modes for tty and I_STR ioctls 1025 */ 1026 #define U_TO_K 01 /* User to Kernel */ 1027 #define K_TO_K 02 /* Kernel to Kernel */ 1028 1029 /* 1030 * Mux defines. 1031 */ 1032 #define LINKNORMAL 0x01 /* normal mux link */ 1033 #define LINKPERSIST 0x02 /* persistent mux link */ 1034 #define LINKTYPEMASK 0x03 /* bitmask of all link types */ 1035 #define LINKCLOSE 0x04 /* unlink from strclose */ 1036 1037 /* 1038 * Definitions of Streams macros and function interfaces. 1039 */ 1040 1041 /* 1042 * Obsolete queue scheduling macros. They are not used anymore, but still kept 1043 * here for 3-d party modules and drivers who might still use them. 1044 */ 1045 #define setqsched() 1046 #define qready() 1 1047 1048 #ifdef _KERNEL 1049 #define runqueues() 1050 #define queuerun() 1051 #endif 1052 1053 /* compatibility module for style 2 drivers with DR race condition */ 1054 #define DRMODNAME "drcompat" 1055 1056 /* 1057 * Macros dealing with mux_nodes. 1058 */ 1059 #define MUX_VISIT(X) ((X)->mn_flags |= VISITED) 1060 #define MUX_CLEAR(X) ((X)->mn_flags &= (~VISITED)); \ 1061 ((X)->mn_originp = NULL) 1062 #define MUX_DIDVISIT(X) ((X)->mn_flags & VISITED) 1063 1064 1065 /* 1066 * Twisted stream macros 1067 */ 1068 #define STRMATED(X) ((X)->sd_flag & STRMATE) 1069 #define STRLOCKMATES(X) if (&((X)->sd_lock) > &(((X)->sd_mate)->sd_lock)) { \ 1070 mutex_enter(&((X)->sd_lock)); \ 1071 mutex_enter(&(((X)->sd_mate)->sd_lock)); \ 1072 } else { \ 1073 mutex_enter(&(((X)->sd_mate)->sd_lock)); \ 1074 mutex_enter(&((X)->sd_lock)); \ 1075 } 1076 #define STRUNLOCKMATES(X) mutex_exit(&((X)->sd_lock)); \ 1077 mutex_exit(&(((X)->sd_mate)->sd_lock)) 1078 1079 #ifdef _KERNEL 1080 1081 extern void strinit(void); 1082 extern int strdoioctl(struct stdata *, struct strioctl *, int, int, 1083 cred_t *, int *); 1084 extern void strsendsig(struct strsig *, int, uchar_t, int); 1085 extern void str_sendsig(vnode_t *, int, uchar_t, int); 1086 extern void strhup(struct stdata *); 1087 extern int qattach(queue_t *, dev_t *, int, cred_t *, fmodsw_impl_t *, 1088 boolean_t); 1089 extern int qreopen(queue_t *, dev_t *, int, cred_t *); 1090 extern void qdetach(queue_t *, int, int, cred_t *, boolean_t); 1091 extern void enterq(queue_t *); 1092 extern void leaveq(queue_t *); 1093 extern int putiocd(mblk_t *, caddr_t, int, cred_t *); 1094 extern int getiocd(mblk_t *, caddr_t, int); 1095 extern struct linkinfo *alloclink(queue_t *, queue_t *, struct file *); 1096 extern void lbfree(struct linkinfo *); 1097 extern int linkcycle(stdata_t *, stdata_t *, str_stack_t *); 1098 extern struct linkinfo *findlinks(stdata_t *, int, int, str_stack_t *); 1099 extern queue_t *getendq(queue_t *); 1100 extern int mlink(vnode_t *, int, int, cred_t *, int *, int); 1101 extern int mlink_file(vnode_t *, int, struct file *, cred_t *, int *, int); 1102 extern int munlink(struct stdata *, struct linkinfo *, int, cred_t *, int *, 1103 str_stack_t *); 1104 extern int munlinkall(struct stdata *, int, cred_t *, int *, str_stack_t *); 1105 extern void mux_addedge(stdata_t *, stdata_t *, int, str_stack_t *); 1106 extern void mux_rmvedge(stdata_t *, int, str_stack_t *); 1107 extern int devflg_to_qflag(struct streamtab *, uint32_t, uint32_t *, 1108 uint32_t *); 1109 extern void setq(queue_t *, struct qinit *, struct qinit *, perdm_t *, 1110 uint32_t, uint32_t, boolean_t); 1111 extern perdm_t *hold_dm(struct streamtab *, uint32_t, uint32_t); 1112 extern void rele_dm(perdm_t *); 1113 extern int strmakectl(struct strbuf *, int32_t, int32_t, mblk_t **); 1114 extern int strmakedata(ssize_t *, struct uio *, stdata_t *, int32_t, mblk_t **); 1115 extern int strmakemsg(struct strbuf *, ssize_t *, struct uio *, 1116 struct stdata *, int32_t, mblk_t **); 1117 extern int strgetmsg(vnode_t *, struct strbuf *, struct strbuf *, uchar_t *, 1118 int *, int, rval_t *); 1119 extern int strputmsg(vnode_t *, struct strbuf *, struct strbuf *, uchar_t, 1120 int flag, int fmode); 1121 extern int strstartplumb(struct stdata *, int, int); 1122 extern void strendplumb(struct stdata *); 1123 extern int stropen(struct vnode *, dev_t *, int, cred_t *); 1124 extern int strclose(struct vnode *, int, cred_t *); 1125 extern int strpoll(register struct stdata *, short, int, short *, 1126 struct pollhead **); 1127 extern void strclean(struct vnode *); 1128 extern void str_cn_clean(); /* XXX hook for consoles signal cleanup */ 1129 extern int strwrite(struct vnode *, struct uio *, cred_t *); 1130 extern int strwrite_common(struct vnode *, struct uio *, cred_t *, int); 1131 extern int strread(struct vnode *, struct uio *, cred_t *); 1132 extern int strioctl(struct vnode *, int, intptr_t, int, int, cred_t *, int *); 1133 extern int strrput(queue_t *, mblk_t *); 1134 extern int strrput_nondata(queue_t *, mblk_t *); 1135 extern mblk_t *strrput_proto(vnode_t *, mblk_t *, 1136 strwakeup_t *, strsigset_t *, strsigset_t *, strpollset_t *); 1137 extern mblk_t *strrput_misc(vnode_t *, mblk_t *, 1138 strwakeup_t *, strsigset_t *, strsigset_t *, strpollset_t *); 1139 extern int getiocseqno(void); 1140 extern int strwaitbuf(size_t, int); 1141 extern int strwaitq(stdata_t *, int, ssize_t, int, clock_t, int *); 1142 extern struct stdata *shalloc(queue_t *); 1143 extern void shfree(struct stdata *s); 1144 extern queue_t *allocq(void); 1145 extern void freeq(queue_t *); 1146 extern qband_t *allocband(void); 1147 extern void freeband(qband_t *); 1148 extern void freebs_enqueue(mblk_t *, dblk_t *); 1149 extern void setqback(queue_t *, unsigned char); 1150 extern int strcopyin(void *, void *, size_t, int); 1151 extern int strcopyout(void *, void *, size_t, int); 1152 extern void strsignal(struct stdata *, int, int32_t); 1153 extern clock_t str_cv_wait(kcondvar_t *, kmutex_t *, clock_t, int); 1154 extern void disable_svc(queue_t *); 1155 extern void enable_svc(queue_t *); 1156 extern void remove_runlist(queue_t *); 1157 extern void wait_svc(queue_t *); 1158 extern void backenable(queue_t *, uchar_t); 1159 extern void set_qend(queue_t *); 1160 extern int strgeterr(stdata_t *, int32_t, int); 1161 extern void qenable_locked(queue_t *); 1162 extern mblk_t *getq_noenab(queue_t *, ssize_t); 1163 extern void rmvq_noenab(queue_t *, mblk_t *); 1164 extern void qbackenable(queue_t *, uchar_t); 1165 extern void set_qfull(queue_t *); 1166 1167 extern void strblock(queue_t *); 1168 extern void strunblock(queue_t *); 1169 extern int qclaimed(queue_t *); 1170 extern int straccess(struct stdata *, enum jcaccess); 1171 1172 extern void entersq(syncq_t *, int); 1173 extern void leavesq(syncq_t *, int); 1174 extern void claimq(queue_t *); 1175 extern void releaseq(queue_t *); 1176 extern void claimstr(queue_t *); 1177 extern void releasestr(queue_t *); 1178 extern void removeq(queue_t *); 1179 extern void insertq(struct stdata *, queue_t *); 1180 extern void drain_syncq(syncq_t *); 1181 extern void qfill_syncq(syncq_t *, queue_t *, mblk_t *); 1182 extern void qdrain_syncq(syncq_t *, queue_t *); 1183 extern int flush_syncq(syncq_t *, queue_t *); 1184 extern void wait_sq_svc(syncq_t *); 1185 1186 extern void outer_enter(syncq_t *, uint16_t); 1187 extern void outer_exit(syncq_t *); 1188 extern void qwriter_inner(queue_t *, mblk_t *, void (*)()); 1189 extern void qwriter_outer(queue_t *, mblk_t *, void (*)()); 1190 1191 extern callbparams_t *callbparams_alloc(syncq_t *, void (*)(void *), 1192 void *, int); 1193 extern void callbparams_free(syncq_t *, callbparams_t *); 1194 extern void callbparams_free_id(syncq_t *, callbparams_id_t, int32_t); 1195 extern void qcallbwrapper(void *); 1196 1197 extern mblk_t *esballoc_wait(unsigned char *, size_t, uint_t, frtn_t *); 1198 extern mblk_t *esballoca(unsigned char *, size_t, uint_t, frtn_t *); 1199 extern mblk_t *desballoca(unsigned char *, size_t, uint_t, frtn_t *); 1200 extern int do_sendfp(struct stdata *, struct file *, struct cred *); 1201 extern int frozenstr(queue_t *); 1202 extern size_t xmsgsize(mblk_t *); 1203 1204 extern void putnext_tail(syncq_t *, queue_t *, uint32_t); 1205 extern void stream_willservice(stdata_t *); 1206 extern void stream_runservice(stdata_t *); 1207 1208 extern void strmate(vnode_t *, vnode_t *); 1209 extern queue_t *strvp2wq(vnode_t *); 1210 extern vnode_t *strq2vp(queue_t *); 1211 extern mblk_t *allocb_wait(size_t, uint_t, uint_t, int *); 1212 extern mblk_t *allocb_cred(size_t, cred_t *, pid_t); 1213 extern mblk_t *allocb_cred_wait(size_t, uint_t, int *, cred_t *, pid_t); 1214 extern mblk_t *allocb_tmpl(size_t, const mblk_t *); 1215 extern mblk_t *allocb_tryhard(size_t); 1216 extern void mblk_copycred(mblk_t *, const mblk_t *); 1217 extern void mblk_setcred(mblk_t *, cred_t *, pid_t); 1218 extern cred_t *msg_getcred(const mblk_t *, pid_t *); 1219 extern struct ts_label_s *msg_getlabel(const mblk_t *); 1220 extern cred_t *msg_extractcred(mblk_t *, pid_t *); 1221 extern void strpollwakeup(vnode_t *, short); 1222 extern int putnextctl_wait(queue_t *, int); 1223 1224 extern int kstrputmsg(struct vnode *, mblk_t *, struct uio *, ssize_t, 1225 unsigned char, int, int); 1226 extern int kstrgetmsg(struct vnode *, mblk_t **, struct uio *, 1227 unsigned char *, int *, clock_t, rval_t *); 1228 1229 extern void strsetrerror(vnode_t *, int, int, errfunc_t); 1230 extern void strsetwerror(vnode_t *, int, int, errfunc_t); 1231 extern void strseteof(vnode_t *, int); 1232 extern void strflushrq(vnode_t *, int); 1233 extern void strsetrputhooks(vnode_t *, uint_t, msgfunc_t, msgfunc_t); 1234 extern void strsetwputhooks(vnode_t *, uint_t, clock_t); 1235 extern void strsetrwputdatahooks(vnode_t *, msgfunc_t, msgfunc_t); 1236 extern int strwaitmark(vnode_t *); 1237 extern void strsignal_nolock(stdata_t *, int, uchar_t); 1238 1239 struct multidata_s; 1240 struct pdesc_s; 1241 extern int hcksum_assoc(mblk_t *, struct multidata_s *, struct pdesc_s *, 1242 uint32_t, uint32_t, uint32_t, uint32_t, uint32_t, int); 1243 extern void hcksum_retrieve(mblk_t *, struct multidata_s *, struct pdesc_s *, 1244 uint32_t *, uint32_t *, uint32_t *, uint32_t *, uint32_t *); 1245 extern void lso_info_set(mblk_t *, uint32_t, uint32_t); 1246 extern void lso_info_cleanup(mblk_t *); 1247 extern unsigned int bcksum(uchar_t *, int, unsigned int); 1248 extern boolean_t is_vmloaned_mblk(mblk_t *, struct multidata_s *, 1249 struct pdesc_s *); 1250 1251 extern int fmodsw_register(const char *, struct streamtab *, int); 1252 extern int fmodsw_unregister(const char *); 1253 extern fmodsw_impl_t *fmodsw_find(const char *, fmodsw_flags_t); 1254 extern void fmodsw_rele(fmodsw_impl_t *); 1255 1256 extern void freemsgchain(mblk_t *); 1257 extern mblk_t *copymsgchain(mblk_t *); 1258 1259 extern mblk_t *mcopyinuio(struct stdata *, uio_t *, ssize_t, ssize_t, int *); 1260 1261 /* 1262 * shared or externally configured data structures 1263 */ 1264 extern ssize_t strmsgsz; /* maximum stream message size */ 1265 extern ssize_t strctlsz; /* maximum size of ctl message */ 1266 extern int nstrpush; /* maximum number of pushes allowed */ 1267 1268 /* 1269 * Bufcalls related variables. 1270 */ 1271 extern struct bclist strbcalls; /* List of bufcalls */ 1272 extern kmutex_t strbcall_lock; /* Protects the list of bufcalls */ 1273 extern kcondvar_t strbcall_cv; /* Signaling when a bufcall is added */ 1274 extern kcondvar_t bcall_cv; /* wait of executing bufcall completes */ 1275 1276 extern frtn_t frnop; 1277 1278 extern struct kmem_cache *ciputctrl_cache; 1279 extern int n_ciputctrl; 1280 extern int max_n_ciputctrl; 1281 extern int min_n_ciputctrl; 1282 1283 extern cdevsw_impl_t *devimpl; 1284 1285 /* 1286 * esballoc queue for throttling 1287 */ 1288 typedef struct esb_queue { 1289 kmutex_t eq_lock; 1290 uint_t eq_len; /* number of queued messages */ 1291 mblk_t *eq_head; /* head of queue */ 1292 mblk_t *eq_tail; /* tail of queue */ 1293 uint_t eq_flags; /* esballoc queue flags */ 1294 } esb_queue_t; 1295 1296 /* 1297 * esballoc flags for queue processing. 1298 */ 1299 #define ESBQ_PROCESSING 0x01 /* queue is being processed */ 1300 #define ESBQ_TIMER 0x02 /* timer is active */ 1301 1302 extern void esballoc_queue_init(void); 1303 1304 #endif /* _KERNEL */ 1305 1306 /* 1307 * Note: Use of these macros are restricted to kernel/unix and 1308 * intended for the STREAMS framework. 1309 * All modules/drivers should include sys/ddi.h. 1310 * 1311 * Finding related queues 1312 */ 1313 #define _OTHERQ(q) ((q)->q_flag&QREADR? (q)+1: (q)-1) 1314 #define _WR(q) ((q)->q_flag&QREADR? (q)+1: (q)) 1315 #define _RD(q) ((q)->q_flag&QREADR? (q): (q)-1) 1316 #define _SAMESTR(q) (!((q)->q_flag & QEND)) 1317 1318 /* 1319 * These are also declared here for modules/drivers that erroneously 1320 * include strsubr.h after ddi.h or fail to include ddi.h at all. 1321 */ 1322 extern struct queue *OTHERQ(queue_t *); /* stream.h */ 1323 extern struct queue *RD(queue_t *); 1324 extern struct queue *WR(queue_t *); 1325 extern int SAMESTR(queue_t *); 1326 1327 /* 1328 * The following hardware checksum related macros are private 1329 * interfaces that are subject to change without notice. 1330 */ 1331 #ifdef _KERNEL 1332 #define DB_CKSUMSTART(mp) ((mp)->b_datap->db_cksumstart) 1333 #define DB_CKSUMEND(mp) ((mp)->b_datap->db_cksumend) 1334 #define DB_CKSUMSTUFF(mp) ((mp)->b_datap->db_cksumstuff) 1335 #define DB_CKSUMFLAGS(mp) ((mp)->b_datap->db_struioun.cksum.flags) 1336 #define DB_CKSUM16(mp) ((mp)->b_datap->db_cksum16) 1337 #define DB_CKSUM32(mp) ((mp)->b_datap->db_cksum32) 1338 #define DB_LSOFLAGS(mp) ((mp)->b_datap->db_struioun.cksum.flags) 1339 #define DB_LSOMSS(mp) ((mp)->b_datap->db_struioun.cksum.pad) 1340 #endif /* _KERNEL */ 1341 1342 #ifdef __cplusplus 1343 } 1344 #endif 1345 1346 1347 #endif /* _SYS_STRSUBR_H */ 1348