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 2008 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 #include <sys/sodirect.h> 48 49 #ifdef __cplusplus 50 extern "C" { 51 #endif 52 53 /* 54 * In general, the STREAMS locks are disjoint; they are only held 55 * locally, and not simultaneously by a thread. However, module 56 * code, including at the stream head, requires some locks to be 57 * acquired in order for its safety. 58 * 1. Stream level claim. This prevents the value of q_next 59 * from changing while module code is executing. 60 * 2. Queue level claim. This prevents the value of q_ptr 61 * from changing while put or service code is executing. 62 * In addition, it provides for queue single-threading 63 * for QPAIR and PERQ MT-safe modules. 64 * 3. Stream head lock. May be held by the stream head module 65 * to implement a read/write/open/close monitor. 66 * Note: that the only types of twisted stream supported are 67 * the pipe and transports which have read and write service 68 * procedures on both sides of the twist. 69 * 4. Queue lock. May be acquired by utility routines on 70 * behalf of a module. 71 */ 72 73 /* 74 * In general, sd_lock protects the consistency of the stdata 75 * structure. Additionally, it is used with sd_monitor 76 * to implement an open/close monitor. In particular, it protects 77 * the following fields: 78 * sd_iocblk 79 * sd_flag 80 * sd_copyflag 81 * sd_iocid 82 * sd_iocwait 83 * sd_sidp 84 * sd_pgidp 85 * sd_wroff 86 * sd_tail 87 * sd_rerror 88 * sd_werror 89 * sd_pushcnt 90 * sd_sigflags 91 * sd_siglist 92 * sd_pollist 93 * sd_mark 94 * sd_closetime 95 * sd_wakeq 96 * sd_maxblk 97 * sd_sodirect 98 * 99 * The following fields are modified only by the allocator, which 100 * has exclusive access to them at that time: 101 * sd_wrq 102 * sd_strtab 103 * 104 * The following field is protected by the overlying file system 105 * code, guaranteeing single-threading of opens: 106 * sd_vnode 107 * 108 * Stream-level locks should be acquired before any queue-level locks 109 * are acquired. 110 * 111 * The stream head write queue lock(sd_wrq) is used to protect the 112 * fields qn_maxpsz and qn_minpsz because freezestr() which is 113 * necessary for strqset() only gets the queue lock. 114 */ 115 116 /* 117 * Function types for the parameterized stream head. 118 * The msgfunc_t takes the parameters: 119 * msgfunc(vnode_t *vp, mblk_t *mp, strwakeup_t *wakeups, 120 * strsigset_t *firstmsgsigs, strsigset_t *allmsgsigs, 121 * strpollset_t *pollwakeups); 122 * It returns an optional message to be processed by the stream head. 123 * 124 * The parameters for errfunc_t are: 125 * errfunc(vnode *vp, int ispeek, int *clearerr); 126 * It returns an errno and zero if there was no pending error. 127 */ 128 typedef uint_t strwakeup_t; 129 typedef uint_t strsigset_t; 130 typedef short strpollset_t; 131 typedef uintptr_t callbparams_id_t; 132 typedef mblk_t *(*msgfunc_t)(vnode_t *, mblk_t *, strwakeup_t *, 133 strsigset_t *, strsigset_t *, strpollset_t *); 134 typedef int (*errfunc_t)(vnode_t *, int, int *); 135 136 /* 137 * Per stream sd_lock in putnext may be replaced by per cpu stream_putlocks 138 * each living in a separate cache line. putnext/canputnext grabs only one of 139 * stream_putlocks while strlock() (called on behalf of insertq()/removeq()) 140 * acquires all stream_putlocks. Normally stream_putlocks are only employed 141 * for highly contended streams that have SQ_CIPUT queues in the critical path 142 * (e.g. NFS/UDP stream). 143 * 144 * stream_putlocks are dynamically assigned to stdata structure through 145 * sd_ciputctrl pointer possibly when a stream is already in use. Since 146 * strlock() uses stream_putlocks only under sd_lock acquiring sd_lock when 147 * assigning stream_putlocks to the stream ensures synchronization with 148 * strlock(). 149 * 150 * For lock ordering purposes stream_putlocks are treated as the extension of 151 * sd_lock and are always grabbed right after grabbing sd_lock and released 152 * right before releasing sd_lock except putnext/canputnext where only one of 153 * stream_putlocks locks is used and where it is the first lock to grab. 154 */ 155 156 typedef struct ciputctrl_str { 157 union _ciput_un { 158 uchar_t pad[64]; 159 struct _ciput_str { 160 kmutex_t ciput_lck; 161 ushort_t ciput_cnt; 162 } ciput_str; 163 } ciput_un; 164 } ciputctrl_t; 165 166 #define ciputctrl_lock ciput_un.ciput_str.ciput_lck 167 #define ciputctrl_count ciput_un.ciput_str.ciput_cnt 168 169 /* 170 * Header for a stream: interface to rest of system. 171 * 172 * NOTE: While this is a consolidation-private structure, some unbundled and 173 * third-party products inappropriately make use of some of the fields. 174 * As such, please take care to not gratuitously change any offsets of 175 * existing members. 176 */ 177 typedef struct stdata { 178 struct queue *sd_wrq; /* write queue */ 179 struct msgb *sd_iocblk; /* return block for ioctl */ 180 struct vnode *sd_vnode; /* pointer to associated vnode */ 181 struct streamtab *sd_strtab; /* pointer to streamtab for stream */ 182 uint_t sd_flag; /* state/flags */ 183 uint_t sd_iocid; /* ioctl id */ 184 struct pid *sd_sidp; /* controlling session info */ 185 struct pid *sd_pgidp; /* controlling process group info */ 186 ushort_t sd_tail; /* reserved space in written mblks */ 187 ushort_t sd_wroff; /* write offset */ 188 int sd_rerror; /* error to return on read ops */ 189 int sd_werror; /* error to return on write ops */ 190 int sd_pushcnt; /* number of pushes done on stream */ 191 int sd_sigflags; /* logical OR of all siglist events */ 192 struct strsig *sd_siglist; /* pid linked list to rcv SIGPOLL sig */ 193 struct pollhead sd_pollist; /* list of all pollers to wake up */ 194 struct msgb *sd_mark; /* "marked" message on read queue */ 195 clock_t sd_closetime; /* time to wait to drain q in close */ 196 kmutex_t sd_lock; /* protect head consistency */ 197 kcondvar_t sd_monitor; /* open/close/push/pop monitor */ 198 kcondvar_t sd_iocmonitor; /* ioctl single-threading */ 199 kcondvar_t sd_refmonitor; /* sd_refcnt monitor */ 200 ssize_t sd_qn_minpsz; /* These two fields are a performance */ 201 ssize_t sd_qn_maxpsz; /* enhancements, cache the values in */ 202 /* the stream head so we don't have */ 203 /* to ask the module below the stream */ 204 /* head to get this information. */ 205 struct stdata *sd_mate; /* pointer to twisted stream mate */ 206 kthread_id_t sd_freezer; /* thread that froze stream */ 207 kmutex_t sd_reflock; /* Protects sd_refcnt */ 208 int sd_refcnt; /* number of claimstr */ 209 uint_t sd_wakeq; /* strwakeq()'s copy of sd_flag */ 210 struct queue *sd_struiordq; /* sync barrier struio() read queue */ 211 struct queue *sd_struiowrq; /* sync barrier struio() write queue */ 212 char sd_struiodnak; /* defer NAK of M_IOCTL by rput() */ 213 struct msgb *sd_struionak; /* pointer M_IOCTL mblk(s) to NAK */ 214 caddr_t sd_t_audit_data; /* For audit purposes only */ 215 ssize_t sd_maxblk; /* maximum message block size */ 216 uint_t sd_rput_opt; /* options/flags for strrput */ 217 uint_t sd_wput_opt; /* options/flags for write/putmsg */ 218 uint_t sd_read_opt; /* options/flags for strread */ 219 msgfunc_t sd_rprotofunc; /* rput M_*PROTO routine */ 220 msgfunc_t sd_rputdatafunc; /* read M_DATA routine */ 221 msgfunc_t sd_rmiscfunc; /* rput routine (non-data/proto) */ 222 msgfunc_t sd_wputdatafunc; /* wput M_DATA routine */ 223 errfunc_t sd_rderrfunc; /* read side error callback */ 224 errfunc_t sd_wrerrfunc; /* write side error callback */ 225 /* 226 * support for low contention concurrent putnext. 227 */ 228 ciputctrl_t *sd_ciputctrl; 229 uint_t sd_nciputctrl; 230 231 int sd_anchor; /* position of anchor in stream */ 232 /* 233 * Service scheduling at the stream head. 234 */ 235 kmutex_t sd_qlock; 236 struct queue *sd_qhead; /* Head of queues to be serviced. */ 237 struct queue *sd_qtail; /* Tail of queues to be serviced. */ 238 void *sd_servid; /* Service ID for bckgrnd schedule */ 239 ushort_t sd_svcflags; /* Servicing flags */ 240 short sd_nqueues; /* Number of queues in the list */ 241 kcondvar_t sd_qcv; /* Waiters for qhead to become empty */ 242 kcondvar_t sd_zcopy_wait; 243 uint_t sd_copyflag; /* copy-related flags */ 244 zoneid_t sd_anchorzone; /* Allow removal from same zone only */ 245 struct msgb *sd_cmdblk; /* reply from _I_CMD */ 246 /* 247 * Support for socket direct. 248 */ 249 sodirect_t *sd_sodirect; /* pointer to shared sodirect_t */ 250 } stdata_t; 251 252 /* 253 * stdata servicing flags. 254 */ 255 #define STRS_WILLSERVICE 0x01 256 #define STRS_SCHEDULED 0x02 257 258 #define STREAM_NEEDSERVICE(stp) ((stp)->sd_qhead != NULL) 259 260 /* 261 * stdata flag field defines 262 */ 263 #define IOCWAIT 0x00000001 /* Someone is doing an ioctl */ 264 #define RSLEEP 0x00000002 /* Someone wants to read/recv msg */ 265 #define WSLEEP 0x00000004 /* Someone wants to write */ 266 #define STRPRI 0x00000008 /* An M_PCPROTO is at stream head */ 267 #define STRHUP 0x00000010 /* Device has vanished */ 268 #define STWOPEN 0x00000020 /* waiting for 1st open */ 269 #define STPLEX 0x00000040 /* stream is being multiplexed */ 270 #define STRISTTY 0x00000080 /* stream is a terminal */ 271 #define STRGETINPROG 0x00000100 /* (k)strgetmsg is running */ 272 #define IOCWAITNE 0x00000200 /* STR_NOERROR ioctl running */ 273 #define STRDERR 0x00000400 /* fatal read error from M_ERROR */ 274 #define STWRERR 0x00000800 /* fatal write error from M_ERROR */ 275 #define STRDERRNONPERSIST 0x00001000 /* nonpersistent read errors */ 276 #define STWRERRNONPERSIST 0x00002000 /* nonpersistent write errors */ 277 #define STRCLOSE 0x00004000 /* wait for a close to complete */ 278 #define SNDMREAD 0x00008000 /* used for read notification */ 279 #define OLDNDELAY 0x00010000 /* use old TTY semantics for */ 280 /* NDELAY reads and writes */ 281 /* 0x00020000 unused */ 282 /* 0x00040000 unused */ 283 #define STRTOSTOP 0x00080000 /* block background writes */ 284 #define STRCMDWAIT 0x00100000 /* someone is doing an _I_CMD */ 285 /* 0x00200000 unused */ 286 #define STRMOUNT 0x00400000 /* stream is mounted */ 287 #define STRNOTATMARK 0x00800000 /* Not at mark (when empty read q) */ 288 #define STRDELIM 0x01000000 /* generate delimited messages */ 289 #define STRATMARK 0x02000000 /* At mark (due to MSGMARKNEXT) */ 290 #define STZCNOTIFY 0x04000000 /* wait for zerocopy mblk to be acked */ 291 #define STRPLUMB 0x08000000 /* push/pop pending */ 292 #define STREOF 0x10000000 /* End-of-file indication */ 293 #define STREOPENFAIL 0x20000000 /* indicates if re-open has failed */ 294 #define STRMATE 0x40000000 /* this stream is a mate */ 295 #define STRHASLINKS 0x80000000 /* I_LINKs under this stream */ 296 297 /* 298 * Copy-related flags (sd_copyflag), set by SO_COPYOPT. 299 */ 300 #define STZCVMSAFE 0x00000001 /* safe to borrow file (segmapped) */ 301 /* pages instead of bcopy */ 302 #define STZCVMUNSAFE 0x00000002 /* unsafe to borrow file pages */ 303 #define STRCOPYCACHED 0x00000004 /* copy should NOT bypass cache */ 304 305 /* 306 * Options and flags for strrput (sd_rput_opt) 307 */ 308 #define SR_POLLIN 0x00000001 /* pollwakeup needed for band0 data */ 309 #define SR_SIGALLDATA 0x00000002 /* Send SIGPOLL for all M_DATA */ 310 #define SR_CONSOL_DATA 0x00000004 /* Consolidate M_DATA onto q_last */ 311 #define SR_IGN_ZEROLEN 0x00000008 /* Ignore zero-length M_DATA */ 312 313 /* 314 * Options and flags for strwrite/strputmsg (sd_wput_opt) 315 */ 316 #define SW_SIGPIPE 0x00000001 /* Send SIGPIPE for write error */ 317 #define SW_RECHECK_ERR 0x00000002 /* Recheck errors in strwrite loop */ 318 #define SW_SNDZERO 0x00000004 /* send 0-length msg down pipe/FIFO */ 319 320 /* 321 * Options and flags for strread (sd_read_opt) 322 */ 323 #define RD_MSGDIS 0x00000001 /* read msg discard */ 324 #define RD_MSGNODIS 0x00000002 /* read msg no discard */ 325 #define RD_PROTDAT 0x00000004 /* read M_[PC]PROTO contents as data */ 326 #define RD_PROTDIS 0x00000008 /* discard M_[PC]PROTO blocks and */ 327 /* retain data blocks */ 328 /* 329 * Flags parameter for strsetrputhooks() and strsetwputhooks(). 330 * These flags define the interface for setting the above internal 331 * flags in sd_rput_opt and sd_wput_opt. 332 */ 333 #define SH_CONSOL_DATA 0x00000001 /* Consolidate M_DATA onto q_last */ 334 #define SH_SIGALLDATA 0x00000002 /* Send SIGPOLL for all M_DATA */ 335 #define SH_IGN_ZEROLEN 0x00000004 /* Drop zero-length M_DATA */ 336 337 #define SH_SIGPIPE 0x00000100 /* Send SIGPIPE for write error */ 338 #define SH_RECHECK_ERR 0x00000200 /* Recheck errors in strwrite loop */ 339 340 /* 341 * Each queue points to a sync queue (the inner perimeter) which keeps 342 * track of the number of threads that are inside a given queue (sq_count) 343 * and also is used to implement the asynchronous putnext 344 * (by queuing messages if the queue can not be entered.) 345 * 346 * Messages are queued on sq_head/sq_tail including deferred qwriter(INNER) 347 * messages. The sq_head/sq_tail list is a singly-linked list with 348 * b_queue recording the queue and b_prev recording the function to 349 * be called (either the put procedure or a qwriter callback function.) 350 * 351 * The sq_count counter tracks the number of threads that are 352 * executing inside the perimeter or (in the case of outer perimeters) 353 * have some work queued for them relating to the perimeter. The sq_rmqcount 354 * counter tracks the subset which are in removeq() (usually invoked from 355 * qprocsoff(9F)). 356 * 357 * In addition a module writer can declare that the module has an outer 358 * perimeter (by setting D_MTOUTPERIM) in which case all inner perimeter 359 * syncq's for the module point (through sq_outer) to an outer perimeter 360 * syncq. The outer perimeter consists of the doubly linked list (sq_onext and 361 * sq_oprev) linking all the inner perimeter syncq's with out outer perimeter 362 * syncq. This is used to implement qwriter(OUTER) (an asynchronous way of 363 * getting exclusive access at the outer perimeter) and outer_enter/exit 364 * which are used by the framework to acquire exclusive access to the outer 365 * perimeter during open and close of modules that have set D_MTOUTPERIM. 366 * 367 * In the inner perimeter case sq_save is available for use by machine 368 * dependent code. sq_head/sq_tail are used to queue deferred messages on 369 * the inner perimeter syncqs and to queue become_writer requests on the 370 * outer perimeter syncqs. 371 * 372 * Note: machine dependent optimized versions of putnext may depend 373 * on the order of sq_flags and sq_count (so that they can e.g. 374 * read these two fields in a single load instruction.) 375 * 376 * Per perimeter SQLOCK/sq_count in putnext/put may be replaced by per cpu 377 * sq_putlocks/sq_putcounts each living in a separate cache line. Obviously 378 * sq_putlock[x] protects sq_putcount[x]. putnext/put routine will grab only 1 379 * of sq_putlocks and update only 1 of sq_putcounts. strlock() and many 380 * other routines in strsubr.c and ddi.c will grab all sq_putlocks (as well as 381 * SQLOCK) and figure out the count value as the sum of sq_count and all of 382 * sq_putcounts. The idea is to make critical fast path -- putnext -- much 383 * faster at the expense of much less often used slower path like 384 * strlock(). One known case where entersq/strlock is executed pretty often is 385 * SpecWeb but since IP is SQ_CIOC and socket TCP/IP stream is nextless 386 * there's no need to grab multiple sq_putlocks and look at sq_putcounts. See 387 * strsubr.c for more comments. 388 * 389 * Note regular SQLOCK and sq_count are still used in many routines 390 * (e.g. entersq(), rwnext()) in the same way as before sq_putlocks were 391 * introduced. 392 * 393 * To understand when all sq_putlocks need to be held and all sq_putcounts 394 * need to be added up one needs to look closely at putnext code. Basically if 395 * a routine like e.g. wait_syncq() needs to be sure that perimeter is empty 396 * all sq_putlocks/sq_putcounts need to be held/added up. On the other hand 397 * there's no need to hold all sq_putlocks and count all sq_putcounts in 398 * routines like leavesq()/dropsq() and etc. since the are usually exit 399 * counterparts of entersq/outer_enter() and etc. which have already either 400 * prevented put entry poins from executing or did not care about put 401 * entrypoints. entersq() doesn't need to care about sq_putlocks/sq_putcounts 402 * if the entry point has a shared access since put has the highest degree of 403 * concurrency and such entersq() does not intend to block out put 404 * entrypoints. 405 * 406 * Before sq_putcounts were introduced the standard way to wait for perimeter 407 * to become empty was: 408 * 409 * mutex_enter(SQLOCK(sq)); 410 * while (sq->sq_count > 0) { 411 * sq->sq_flags |= SQ_WANTWAKEUP; 412 * cv_wait(&sq->sq_wait, SQLOCK(sq)); 413 * } 414 * mutex_exit(SQLOCK(sq)); 415 * 416 * The new way is: 417 * 418 * mutex_enter(SQLOCK(sq)); 419 * count = sq->sq_count; 420 * SQ_PUTLOCKS_ENTER(sq); 421 * SUM_SQ_PUTCOUNTS(sq, count); 422 * while (count != 0) { 423 * sq->sq_flags |= SQ_WANTWAKEUP; 424 * SQ_PUTLOCKS_EXIT(sq); 425 * cv_wait(&sq->sq_wait, SQLOCK(sq)); 426 * count = sq->sq_count; 427 * SQ_PUTLOCKS_ENTER(sq); 428 * SUM_SQ_PUTCOUNTS(sq, count); 429 * } 430 * SQ_PUTLOCKS_EXIT(sq); 431 * mutex_exit(SQLOCK(sq)); 432 * 433 * Note that SQ_WANTWAKEUP is set before dropping SQ_PUTLOCKS. This makes sure 434 * putnext won't skip a wakeup. 435 * 436 * sq_putlocks are treated as the extension of SQLOCK for lock ordering 437 * purposes and are always grabbed right after grabbing SQLOCK and released 438 * right before releasing SQLOCK. This also allows dynamic creation of 439 * sq_putlocks while holding SQLOCK (by making sq_ciputctrl non null even when 440 * the stream is already in use). Only in putnext one of sq_putlocks 441 * is grabbed instead of SQLOCK. putnext return path remembers what counter it 442 * incremented and decrements the right counter on its way out. 443 */ 444 445 struct syncq { 446 kmutex_t sq_lock; /* atomic access to syncq */ 447 uint16_t sq_count; /* # threads inside */ 448 uint16_t sq_flags; /* state and some type info */ 449 /* 450 * Distributed syncq scheduling 451 * The list of queue's is handled by sq_head and 452 * sq_tail fields. 453 * 454 * The list of events is handled by the sq_evhead and sq_evtail 455 * fields. 456 */ 457 queue_t *sq_head; /* queue of deferred messages */ 458 queue_t *sq_tail; /* queue of deferred messages */ 459 mblk_t *sq_evhead; /* Event message on the syncq */ 460 mblk_t *sq_evtail; 461 uint_t sq_nqueues; /* # of queues on this sq */ 462 /* 463 * Concurrency and condition variables 464 */ 465 uint16_t sq_type; /* type (concurrency) of syncq */ 466 uint16_t sq_rmqcount; /* # threads inside removeq() */ 467 kcondvar_t sq_wait; /* block on this sync queue */ 468 kcondvar_t sq_exitwait; /* waiting for thread to leave the */ 469 /* inner perimeter */ 470 /* 471 * Handling synchronous callbacks such as qtimeout and qbufcall 472 */ 473 ushort_t sq_callbflags; /* flags for callback synchronization */ 474 callbparams_id_t sq_cancelid; /* id of callback being cancelled */ 475 struct callbparams *sq_callbpend; /* Pending callbacks */ 476 477 /* 478 * Links forming an outer perimeter from one outer syncq and 479 * a set of inner sync queues. 480 */ 481 struct syncq *sq_outer; /* Pointer to outer perimeter */ 482 struct syncq *sq_onext; /* Linked list of syncq's making */ 483 struct syncq *sq_oprev; /* up the outer perimeter. */ 484 /* 485 * support for low contention concurrent putnext. 486 */ 487 ciputctrl_t *sq_ciputctrl; 488 uint_t sq_nciputctrl; 489 /* 490 * Counter for the number of threads wanting to become exclusive. 491 */ 492 uint_t sq_needexcl; 493 /* 494 * These two fields are used for scheduling a syncq for 495 * background processing. The sq_svcflag is protected by 496 * SQLOCK lock. 497 */ 498 struct syncq *sq_next; /* for syncq scheduling */ 499 void * sq_servid; 500 uint_t sq_servcount; /* # pending background threads */ 501 uint_t sq_svcflags; /* Scheduling flags */ 502 clock_t sq_tstamp; /* Time when was enabled */ 503 /* 504 * Maximum priority of the queues on this syncq. 505 */ 506 pri_t sq_pri; 507 }; 508 typedef struct syncq syncq_t; 509 510 /* 511 * sync queue scheduling flags (for sq_svcflags). 512 */ 513 #define SQ_SERVICE 0x1 /* being serviced */ 514 #define SQ_BGTHREAD 0x2 /* awaiting service by bg thread */ 515 #define SQ_DISABLED 0x4 /* don't put syncq in service list */ 516 517 /* 518 * FASTPUT bit in sd_count/putcount. 519 */ 520 #define SQ_FASTPUT 0x8000 521 #define SQ_FASTMASK 0x7FFF 522 523 /* 524 * sync queue state flags 525 */ 526 #define SQ_EXCL 0x0001 /* exclusive access to inner */ 527 /* perimeter */ 528 #define SQ_BLOCKED 0x0002 /* qprocsoff */ 529 #define SQ_FROZEN 0x0004 /* freezestr */ 530 #define SQ_WRITER 0x0008 /* qwriter(OUTER) pending or running */ 531 #define SQ_MESSAGES 0x0010 /* messages on syncq */ 532 #define SQ_WANTWAKEUP 0x0020 /* do cv_broadcast on sq_wait */ 533 #define SQ_WANTEXWAKEUP 0x0040 /* do cv_broadcast on sq_exitwait */ 534 #define SQ_EVENTS 0x0080 /* Events pending */ 535 #define SQ_QUEUED (SQ_MESSAGES | SQ_EVENTS) 536 #define SQ_FLAGMASK 0x00FF 537 538 /* 539 * Test a queue to see if inner perimeter is exclusive. 540 */ 541 #define PERIM_EXCL(q) ((q)->q_syncq->sq_flags & SQ_EXCL) 542 543 /* 544 * If any of these flags are set it is not possible for a thread to 545 * enter a put or service procedure. Instead it must either block 546 * or put the message on the syncq. 547 */ 548 #define SQ_GOAWAY (SQ_EXCL|SQ_BLOCKED|SQ_FROZEN|SQ_WRITER|\ 549 SQ_QUEUED) 550 /* 551 * If any of these flags are set it not possible to drain the syncq 552 */ 553 #define SQ_STAYAWAY (SQ_BLOCKED|SQ_FROZEN|SQ_WRITER) 554 555 /* 556 * Flags to trigger syncq tail processing. 557 */ 558 #define SQ_TAIL (SQ_QUEUED|SQ_WANTWAKEUP|SQ_WANTEXWAKEUP) 559 560 /* 561 * Syncq types (stored in sq_type) 562 * The SQ_TYPES_IN_FLAGS (ciput) are also stored in sq_flags 563 * for performance reasons. Thus these type values have to be in the low 564 * 16 bits and not conflict with the sq_flags values above. 565 * 566 * Notes: 567 * - putnext() and put() assume that the put procedures have the highest 568 * degree of concurrency. Thus if any of the SQ_CI* are set then SQ_CIPUT 569 * has to be set. This restriction can be lifted by adding code to putnext 570 * and put that check that sq_count == 0 like entersq does. 571 * - putnext() and put() does currently not handle !SQ_COPUT 572 * - In order to implement !SQ_COCB outer_enter has to be fixed so that 573 * the callback can be cancelled while cv_waiting in outer_enter. 574 * - If SQ_CISVC needs to be implemented, qprocsoff() needs to wait 575 * for the currently running services to stop (wait for QINSERVICE 576 * to go off). disable_svc called from qprcosoff disables only 577 * services that will be run in future. 578 * 579 * All the SQ_CO flags are set when there is no outer perimeter. 580 */ 581 #define SQ_CIPUT 0x0100 /* Concurrent inner put proc */ 582 #define SQ_CISVC 0x0200 /* Concurrent inner svc proc */ 583 #define SQ_CIOC 0x0400 /* Concurrent inner open/close */ 584 #define SQ_CICB 0x0800 /* Concurrent inner callback */ 585 #define SQ_COPUT 0x1000 /* Concurrent outer put proc */ 586 #define SQ_COSVC 0x2000 /* Concurrent outer svc proc */ 587 #define SQ_COOC 0x4000 /* Concurrent outer open/close */ 588 #define SQ_COCB 0x8000 /* Concurrent outer callback */ 589 590 /* Types also kept in sq_flags for performance */ 591 #define SQ_TYPES_IN_FLAGS (SQ_CIPUT) 592 593 #define SQ_CI (SQ_CIPUT|SQ_CISVC|SQ_CIOC|SQ_CICB) 594 #define SQ_CO (SQ_COPUT|SQ_COSVC|SQ_COOC|SQ_COCB) 595 #define SQ_TYPEMASK (SQ_CI|SQ_CO) 596 597 /* 598 * Flag combinations passed to entersq and leavesq to specify the type 599 * of entry point. 600 */ 601 #define SQ_PUT (SQ_CIPUT|SQ_COPUT) 602 #define SQ_SVC (SQ_CISVC|SQ_COSVC) 603 #define SQ_OPENCLOSE (SQ_CIOC|SQ_COOC) 604 #define SQ_CALLBACK (SQ_CICB|SQ_COCB) 605 606 /* 607 * Other syncq types which are not copied into flags. 608 */ 609 #define SQ_PERMOD 0x01 /* Syncq is PERMOD */ 610 611 /* 612 * Asynchronous callback qun*** flag. 613 * The mechanism these flags are used in is one where callbacks enter 614 * the perimeter thanks to framework support. To use this mechanism 615 * the q* and qun* flavors of the callback routines must be used. 616 * e.g. qtimeout and quntimeout. The synchronization provided by the flags 617 * avoids deadlocks between blocking qun* routines and the perimeter 618 * lock. 619 */ 620 #define SQ_CALLB_BYPASSED 0x01 /* bypassed callback fn */ 621 622 /* 623 * Cancel callback mask. 624 * The mask expands as the number of cancelable callback types grows 625 * Note - separate callback flag because different callbacks have 626 * overlapping id space. 627 */ 628 #define SQ_CALLB_CANCEL_MASK (SQ_CANCEL_TOUT|SQ_CANCEL_BUFCALL) 629 630 #define SQ_CANCEL_TOUT 0x02 /* cancel timeout request */ 631 #define SQ_CANCEL_BUFCALL 0x04 /* cancel bufcall request */ 632 633 typedef struct callbparams { 634 syncq_t *cbp_sq; 635 void (*cbp_func)(void *); 636 void *cbp_arg; 637 callbparams_id_t cbp_id; 638 uint_t cbp_flags; 639 struct callbparams *cbp_next; 640 size_t cbp_size; 641 } callbparams_t; 642 643 typedef struct strbufcall { 644 void (*bc_func)(void *); 645 void *bc_arg; 646 size_t bc_size; 647 bufcall_id_t bc_id; 648 struct strbufcall *bc_next; 649 kthread_id_t bc_executor; 650 } strbufcall_t; 651 652 /* 653 * Structure of list of processes to be sent SIGPOLL/SIGURG signal 654 * on request. The valid S_* events are defined in stropts.h. 655 */ 656 typedef struct strsig { 657 struct pid *ss_pidp; /* pid/pgrp pointer */ 658 pid_t ss_pid; /* positive pid, negative pgrp */ 659 int ss_events; /* S_* events */ 660 struct strsig *ss_next; 661 } strsig_t; 662 663 /* 664 * bufcall list 665 */ 666 struct bclist { 667 strbufcall_t *bc_head; 668 strbufcall_t *bc_tail; 669 }; 670 671 /* 672 * Structure used to track mux links and unlinks. 673 */ 674 struct mux_node { 675 major_t mn_imaj; /* internal major device number */ 676 uint16_t mn_indegree; /* number of incoming edges */ 677 struct mux_node *mn_originp; /* where we came from during search */ 678 struct mux_edge *mn_startp; /* where search left off in mn_outp */ 679 struct mux_edge *mn_outp; /* list of outgoing edges */ 680 uint_t mn_flags; /* see below */ 681 }; 682 683 /* 684 * Flags for mux_nodes. 685 */ 686 #define VISITED 1 687 688 /* 689 * Edge structure - a list of these is hung off the 690 * mux_node to represent the outgoing edges. 691 */ 692 struct mux_edge { 693 struct mux_node *me_nodep; /* edge leads to this node */ 694 struct mux_edge *me_nextp; /* next edge */ 695 int me_muxid; /* id of link */ 696 dev_t me_dev; /* dev_t - used for kernel PUNLINK */ 697 }; 698 699 /* 700 * Queue info 701 * 702 * The syncq is included here to reduce memory fragmentation 703 * for kernel memory allocators that only allocate in sizes that are 704 * powers of two. If the kernel memory allocator changes this should 705 * be revisited. 706 */ 707 typedef struct queinfo { 708 struct queue qu_rqueue; /* read queue - must be first */ 709 struct queue qu_wqueue; /* write queue - must be second */ 710 struct syncq qu_syncq; /* syncq - must be third */ 711 } queinfo_t; 712 713 /* 714 * Multiplexed streams info 715 */ 716 typedef struct linkinfo { 717 struct linkblk li_lblk; /* must be first */ 718 struct file *li_fpdown; /* file pointer for lower stream */ 719 struct linkinfo *li_next; /* next in list */ 720 struct linkinfo *li_prev; /* previous in list */ 721 } linkinfo_t; 722 723 /* 724 * List of syncq's used by freeezestr/unfreezestr 725 */ 726 typedef struct syncql { 727 struct syncql *sql_next; 728 syncq_t *sql_sq; 729 } syncql_t; 730 731 typedef struct sqlist { 732 syncql_t *sqlist_head; 733 size_t sqlist_size; /* structure size in bytes */ 734 size_t sqlist_index; /* next free entry in array */ 735 syncql_t sqlist_array[4]; /* 4 or more entries */ 736 } sqlist_t; 737 738 typedef struct perdm { 739 struct perdm *dm_next; 740 syncq_t *dm_sq; 741 struct streamtab *dm_str; 742 uint_t dm_ref; 743 } perdm_t; 744 745 #define NEED_DM(dmp, qflag) \ 746 (dmp == NULL && (qflag & (QPERMOD | QMTOUTPERIM))) 747 748 /* 749 * fmodsw_impl_t is used within the kernel. fmodsw is used by 750 * the modules/drivers. The information is copied from fmodsw 751 * defined in the module/driver into the fmodsw_impl_t structure 752 * during the module/driver initialization. 753 */ 754 typedef struct fmodsw_impl fmodsw_impl_t; 755 756 struct fmodsw_impl { 757 fmodsw_impl_t *f_next; 758 char f_name[FMNAMESZ + 1]; 759 struct streamtab *f_str; 760 uint32_t f_qflag; 761 uint32_t f_sqtype; 762 perdm_t *f_dmp; 763 uint32_t f_ref; 764 uint32_t f_hits; 765 }; 766 767 typedef enum { 768 FMODSW_HOLD = 0x00000001, 769 FMODSW_LOAD = 0x00000002 770 } fmodsw_flags_t; 771 772 typedef struct cdevsw_impl { 773 struct streamtab *d_str; 774 uint32_t d_qflag; 775 uint32_t d_sqtype; 776 perdm_t *d_dmp; 777 } cdevsw_impl_t; 778 779 /* 780 * Enumeration of the types of access that can be requested for a 781 * controlling terminal under job control. 782 */ 783 enum jcaccess { 784 JCREAD, /* read data on a ctty */ 785 JCWRITE, /* write data to a ctty */ 786 JCSETP, /* set ctty parameters */ 787 JCGETP /* get ctty parameters */ 788 }; 789 790 struct str_stack { 791 netstack_t *ss_netstack; /* Common netstack */ 792 793 kmutex_t ss_sad_lock; /* autopush lock */ 794 mod_hash_t *ss_sad_hash; 795 size_t ss_sad_hash_nchains; 796 struct saddev *ss_saddev; /* sad device array */ 797 int ss_sadcnt; /* number of sad devices */ 798 799 int ss_devcnt; /* number of mux_nodes */ 800 struct mux_node *ss_mux_nodes; /* mux info for cycle checking */ 801 }; 802 typedef struct str_stack str_stack_t; 803 804 /* 805 * Finding related queues 806 */ 807 #define STREAM(q) ((q)->q_stream) 808 #define SQ(rq) ((syncq_t *)((rq) + 2)) 809 810 /* 811 * Locking macros 812 */ 813 #define QLOCK(q) (&(q)->q_lock) 814 #define SQLOCK(sq) (&(sq)->sq_lock) 815 816 #define STREAM_PUTLOCKS_ENTER(stp) { \ 817 ASSERT(MUTEX_HELD(&(stp)->sd_lock)); \ 818 if ((stp)->sd_ciputctrl != NULL) { \ 819 int i; \ 820 int nlocks = (stp)->sd_nciputctrl; \ 821 ciputctrl_t *cip = (stp)->sd_ciputctrl; \ 822 for (i = 0; i <= nlocks; i++) { \ 823 mutex_enter(&cip[i].ciputctrl_lock); \ 824 } \ 825 } \ 826 } 827 828 #define STREAM_PUTLOCKS_EXIT(stp) { \ 829 ASSERT(MUTEX_HELD(&(stp)->sd_lock)); \ 830 if ((stp)->sd_ciputctrl != NULL) { \ 831 int i; \ 832 int nlocks = (stp)->sd_nciputctrl; \ 833 ciputctrl_t *cip = (stp)->sd_ciputctrl; \ 834 for (i = 0; i <= nlocks; i++) { \ 835 mutex_exit(&cip[i].ciputctrl_lock); \ 836 } \ 837 } \ 838 } 839 840 #define SQ_PUTLOCKS_ENTER(sq) { \ 841 ASSERT(MUTEX_HELD(SQLOCK(sq))); \ 842 if ((sq)->sq_ciputctrl != NULL) { \ 843 int i; \ 844 int nlocks = (sq)->sq_nciputctrl; \ 845 ciputctrl_t *cip = (sq)->sq_ciputctrl; \ 846 ASSERT((sq)->sq_type & SQ_CIPUT); \ 847 for (i = 0; i <= nlocks; i++) { \ 848 mutex_enter(&cip[i].ciputctrl_lock); \ 849 } \ 850 } \ 851 } 852 853 #define SQ_PUTLOCKS_EXIT(sq) { \ 854 ASSERT(MUTEX_HELD(SQLOCK(sq))); \ 855 if ((sq)->sq_ciputctrl != NULL) { \ 856 int i; \ 857 int nlocks = (sq)->sq_nciputctrl; \ 858 ciputctrl_t *cip = (sq)->sq_ciputctrl; \ 859 ASSERT((sq)->sq_type & SQ_CIPUT); \ 860 for (i = 0; i <= nlocks; i++) { \ 861 mutex_exit(&cip[i].ciputctrl_lock); \ 862 } \ 863 } \ 864 } 865 866 #define SQ_PUTCOUNT_SETFAST(sq) { \ 867 ASSERT(MUTEX_HELD(SQLOCK(sq))); \ 868 if ((sq)->sq_ciputctrl != NULL) { \ 869 int i; \ 870 int nlocks = (sq)->sq_nciputctrl; \ 871 ciputctrl_t *cip = (sq)->sq_ciputctrl; \ 872 ASSERT((sq)->sq_type & SQ_CIPUT); \ 873 for (i = 0; i <= nlocks; i++) { \ 874 mutex_enter(&cip[i].ciputctrl_lock); \ 875 cip[i].ciputctrl_count |= SQ_FASTPUT; \ 876 mutex_exit(&cip[i].ciputctrl_lock); \ 877 } \ 878 } \ 879 } 880 881 #define SQ_PUTCOUNT_CLRFAST(sq) { \ 882 ASSERT(MUTEX_HELD(SQLOCK(sq))); \ 883 if ((sq)->sq_ciputctrl != NULL) { \ 884 int i; \ 885 int nlocks = (sq)->sq_nciputctrl; \ 886 ciputctrl_t *cip = (sq)->sq_ciputctrl; \ 887 ASSERT((sq)->sq_type & SQ_CIPUT); \ 888 for (i = 0; i <= nlocks; i++) { \ 889 mutex_enter(&cip[i].ciputctrl_lock); \ 890 cip[i].ciputctrl_count &= ~SQ_FASTPUT; \ 891 mutex_exit(&cip[i].ciputctrl_lock); \ 892 } \ 893 } \ 894 } 895 896 897 #ifdef DEBUG 898 899 #define SQ_PUTLOCKS_HELD(sq) { \ 900 ASSERT(MUTEX_HELD(SQLOCK(sq))); \ 901 if ((sq)->sq_ciputctrl != NULL) { \ 902 int i; \ 903 int nlocks = (sq)->sq_nciputctrl; \ 904 ciputctrl_t *cip = (sq)->sq_ciputctrl; \ 905 ASSERT((sq)->sq_type & SQ_CIPUT); \ 906 for (i = 0; i <= nlocks; i++) { \ 907 ASSERT(MUTEX_HELD(&cip[i].ciputctrl_lock)); \ 908 } \ 909 } \ 910 } 911 912 #define SUMCHECK_SQ_PUTCOUNTS(sq, countcheck) { \ 913 if ((sq)->sq_ciputctrl != NULL) { \ 914 int i; \ 915 uint_t count = 0; \ 916 int ncounts = (sq)->sq_nciputctrl; \ 917 ASSERT((sq)->sq_type & SQ_CIPUT); \ 918 for (i = 0; i <= ncounts; i++) { \ 919 count += \ 920 (((sq)->sq_ciputctrl[i].ciputctrl_count) & \ 921 SQ_FASTMASK); \ 922 } \ 923 ASSERT(count == (countcheck)); \ 924 } \ 925 } 926 927 #define SUMCHECK_CIPUTCTRL_COUNTS(ciput, nciput, countcheck) { \ 928 int i; \ 929 uint_t count = 0; \ 930 ASSERT((ciput) != NULL); \ 931 for (i = 0; i <= (nciput); i++) { \ 932 count += (((ciput)[i].ciputctrl_count) & \ 933 SQ_FASTMASK); \ 934 } \ 935 ASSERT(count == (countcheck)); \ 936 } 937 938 #else /* DEBUG */ 939 940 #define SQ_PUTLOCKS_HELD(sq) 941 #define SUMCHECK_SQ_PUTCOUNTS(sq, countcheck) 942 #define SUMCHECK_CIPUTCTRL_COUNTS(sq, nciput, countcheck) 943 944 #endif /* DEBUG */ 945 946 #define SUM_SQ_PUTCOUNTS(sq, count) { \ 947 if ((sq)->sq_ciputctrl != NULL) { \ 948 int i; \ 949 int ncounts = (sq)->sq_nciputctrl; \ 950 ciputctrl_t *cip = (sq)->sq_ciputctrl; \ 951 ASSERT((sq)->sq_type & SQ_CIPUT); \ 952 for (i = 0; i <= ncounts; i++) { \ 953 (count) += ((cip[i].ciputctrl_count) & \ 954 SQ_FASTMASK); \ 955 } \ 956 } \ 957 } 958 959 #define CLAIM_QNEXT_LOCK(stp) mutex_enter(&(stp)->sd_lock) 960 #define RELEASE_QNEXT_LOCK(stp) mutex_exit(&(stp)->sd_lock) 961 962 /* 963 * syncq message manipulation macros. 964 */ 965 /* 966 * Put a message on the queue syncq. 967 * Assumes QLOCK held. 968 */ 969 #define SQPUT_MP(qp, mp) \ 970 { \ 971 qp->q_syncqmsgs++; \ 972 if (qp->q_sqhead == NULL) { \ 973 qp->q_sqhead = qp->q_sqtail = mp; \ 974 } else { \ 975 qp->q_sqtail->b_next = mp; \ 976 qp->q_sqtail = mp; \ 977 } \ 978 set_qfull(qp); \ 979 } 980 981 /* 982 * Miscellaneous parameters and flags. 983 */ 984 985 /* 986 * Default timeout in milliseconds for ioctls and close 987 */ 988 #define STRTIMOUT 15000 989 990 /* 991 * Flag values for stream io 992 */ 993 #define WRITEWAIT 0x1 /* waiting for write event */ 994 #define READWAIT 0x2 /* waiting for read event */ 995 #define NOINTR 0x4 /* error is not to be set for signal */ 996 #define GETWAIT 0x8 /* waiting for getmsg event */ 997 998 /* 999 * These flags need to be unique for stream io name space 1000 * and copy modes name space. These flags allow strwaitq 1001 * and strdoioctl to proceed as if signals or errors on the stream 1002 * head have not occurred; i.e. they will be detected by some other 1003 * means. 1004 * STR_NOSIG does not allow signals to interrupt the call 1005 * STR_NOERROR does not allow stream head read, write or hup errors to 1006 * affect the call. When used with strdoioctl(), if a previous ioctl 1007 * is pending and times out, STR_NOERROR will cause strdoioctl() to not 1008 * return ETIME. If, however, the requested ioctl times out, ETIME 1009 * will be returned (use ic_timout instead) 1010 * STR_PEEK is used to inform strwaitq that the reader is peeking at data 1011 * and that a non-persistent error should not be cleared. 1012 * STR_DELAYERR is used to inform strwaitq that it should not check errors 1013 * after being awoken since, in addition to an error, there might also be 1014 * data queued on the stream head read queue. 1015 */ 1016 #define STR_NOSIG 0x10 /* Ignore signals during strdoioctl/strwaitq */ 1017 #define STR_NOERROR 0x20 /* Ignore errors during strdoioctl/strwaitq */ 1018 #define STR_PEEK 0x40 /* Peeking behavior on non-persistent errors */ 1019 #define STR_DELAYERR 0x80 /* Do not check errors on return */ 1020 1021 /* 1022 * Copy modes for tty and I_STR ioctls 1023 */ 1024 #define U_TO_K 01 /* User to Kernel */ 1025 #define K_TO_K 02 /* Kernel to Kernel */ 1026 1027 /* 1028 * Mux defines. 1029 */ 1030 #define LINKNORMAL 0x01 /* normal mux link */ 1031 #define LINKPERSIST 0x02 /* persistent mux link */ 1032 #define LINKTYPEMASK 0x03 /* bitmask of all link types */ 1033 #define LINKCLOSE 0x04 /* unlink from strclose */ 1034 1035 /* 1036 * Definitions of Streams macros and function interfaces. 1037 */ 1038 1039 /* 1040 * Obsolete queue scheduling macros. They are not used anymore, but still kept 1041 * here for 3-d party modules and drivers who might still use them. 1042 */ 1043 #define setqsched() 1044 #define qready() 1 1045 1046 #ifdef _KERNEL 1047 #define runqueues() 1048 #define queuerun() 1049 #endif 1050 1051 /* compatibility module for style 2 drivers with DR race condition */ 1052 #define DRMODNAME "drcompat" 1053 1054 /* 1055 * Macros dealing with mux_nodes. 1056 */ 1057 #define MUX_VISIT(X) ((X)->mn_flags |= VISITED) 1058 #define MUX_CLEAR(X) ((X)->mn_flags &= (~VISITED)); \ 1059 ((X)->mn_originp = NULL) 1060 #define MUX_DIDVISIT(X) ((X)->mn_flags & VISITED) 1061 1062 1063 /* 1064 * Twisted stream macros 1065 */ 1066 #define STRMATED(X) ((X)->sd_flag & STRMATE) 1067 #define STRLOCKMATES(X) if (&((X)->sd_lock) > &(((X)->sd_mate)->sd_lock)) { \ 1068 mutex_enter(&((X)->sd_lock)); \ 1069 mutex_enter(&(((X)->sd_mate)->sd_lock)); \ 1070 } else { \ 1071 mutex_enter(&(((X)->sd_mate)->sd_lock)); \ 1072 mutex_enter(&((X)->sd_lock)); \ 1073 } 1074 #define STRUNLOCKMATES(X) mutex_exit(&((X)->sd_lock)); \ 1075 mutex_exit(&(((X)->sd_mate)->sd_lock)) 1076 1077 #ifdef _KERNEL 1078 1079 extern void strinit(void); 1080 extern int strdoioctl(struct stdata *, struct strioctl *, int, int, 1081 cred_t *, int *); 1082 extern void strsendsig(struct strsig *, int, uchar_t, int); 1083 extern void str_sendsig(vnode_t *, int, uchar_t, int); 1084 extern void strhup(struct stdata *); 1085 extern int qattach(queue_t *, dev_t *, int, cred_t *, fmodsw_impl_t *, 1086 boolean_t); 1087 extern int qreopen(queue_t *, dev_t *, int, cred_t *); 1088 extern void qdetach(queue_t *, int, int, cred_t *, boolean_t); 1089 extern void enterq(queue_t *); 1090 extern void leaveq(queue_t *); 1091 extern int putiocd(mblk_t *, caddr_t, int, cred_t *); 1092 extern int getiocd(mblk_t *, caddr_t, int); 1093 extern struct linkinfo *alloclink(queue_t *, queue_t *, struct file *); 1094 extern void lbfree(struct linkinfo *); 1095 extern int linkcycle(stdata_t *, stdata_t *, str_stack_t *); 1096 extern struct linkinfo *findlinks(stdata_t *, int, int, str_stack_t *); 1097 extern queue_t *getendq(queue_t *); 1098 extern int mlink(vnode_t *, int, int, cred_t *, int *, int); 1099 extern int mlink_file(vnode_t *, int, struct file *, cred_t *, int *, int); 1100 extern int munlink(struct stdata *, struct linkinfo *, int, cred_t *, int *, 1101 str_stack_t *); 1102 extern int munlinkall(struct stdata *, int, cred_t *, int *, str_stack_t *); 1103 extern void mux_addedge(stdata_t *, stdata_t *, int, str_stack_t *); 1104 extern void mux_rmvedge(stdata_t *, int, str_stack_t *); 1105 extern int devflg_to_qflag(struct streamtab *, uint32_t, uint32_t *, 1106 uint32_t *); 1107 extern void setq(queue_t *, struct qinit *, struct qinit *, perdm_t *, 1108 uint32_t, uint32_t, boolean_t); 1109 extern perdm_t *hold_dm(struct streamtab *, uint32_t, uint32_t); 1110 extern void rele_dm(perdm_t *); 1111 extern int strmakectl(struct strbuf *, int32_t, int32_t, mblk_t **); 1112 extern int strmakedata(ssize_t *, struct uio *, stdata_t *, int32_t, mblk_t **); 1113 extern int strmakemsg(struct strbuf *, ssize_t *, struct uio *, 1114 struct stdata *, int32_t, mblk_t **); 1115 extern int strgetmsg(vnode_t *, struct strbuf *, struct strbuf *, uchar_t *, 1116 int *, int, rval_t *); 1117 extern int strputmsg(vnode_t *, struct strbuf *, struct strbuf *, uchar_t, 1118 int flag, int fmode); 1119 extern int strstartplumb(struct stdata *, int, int); 1120 extern void strendplumb(struct stdata *); 1121 extern int stropen(struct vnode *, dev_t *, int, cred_t *); 1122 extern int strclose(struct vnode *, int, cred_t *); 1123 extern int strpoll(register struct stdata *, short, int, short *, 1124 struct pollhead **); 1125 extern void strclean(struct vnode *); 1126 extern void str_cn_clean(); /* XXX hook for consoles signal cleanup */ 1127 extern int strwrite(struct vnode *, struct uio *, cred_t *); 1128 extern int strwrite_common(struct vnode *, struct uio *, cred_t *, int); 1129 extern int kstrwritemp(struct vnode *, mblk_t *, ushort_t); 1130 extern int strread(struct vnode *, struct uio *, cred_t *); 1131 extern int strioctl(struct vnode *, int, intptr_t, int, int, cred_t *, int *); 1132 extern int strrput(queue_t *, mblk_t *); 1133 extern int strrput_nondata(queue_t *, mblk_t *); 1134 extern mblk_t *strrput_proto(vnode_t *, mblk_t *, 1135 strwakeup_t *, strsigset_t *, strsigset_t *, strpollset_t *); 1136 extern mblk_t *strrput_misc(vnode_t *, mblk_t *, 1137 strwakeup_t *, strsigset_t *, strsigset_t *, strpollset_t *); 1138 extern int getiocseqno(void); 1139 extern int strwaitbuf(size_t, int); 1140 extern int strwaitq(stdata_t *, int, ssize_t, int, clock_t, int *); 1141 extern struct stdata *shalloc(queue_t *); 1142 extern void shfree(struct stdata *s); 1143 extern queue_t *allocq(void); 1144 extern void freeq(queue_t *); 1145 extern qband_t *allocband(void); 1146 extern void freeband(qband_t *); 1147 extern void freebs_enqueue(mblk_t *, dblk_t *); 1148 extern void setqback(queue_t *, unsigned char); 1149 extern int strcopyin(void *, void *, size_t, int); 1150 extern int strcopyout(void *, void *, size_t, int); 1151 extern void strsignal(struct stdata *, int, int32_t); 1152 extern clock_t str_cv_wait(kcondvar_t *, kmutex_t *, clock_t, int); 1153 extern void disable_svc(queue_t *); 1154 extern void remove_runlist(queue_t *); 1155 extern void wait_svc(queue_t *); 1156 extern void backenable(queue_t *, uchar_t); 1157 extern void set_qend(queue_t *); 1158 extern int strgeterr(stdata_t *, int32_t, int); 1159 extern void qenable_locked(queue_t *); 1160 extern mblk_t *getq_noenab(queue_t *, ssize_t); 1161 extern void rmvq_noenab(queue_t *, mblk_t *); 1162 extern void qbackenable(queue_t *, uchar_t); 1163 extern void set_qfull(queue_t *); 1164 1165 extern void strblock(queue_t *); 1166 extern void strunblock(queue_t *); 1167 extern int qclaimed(queue_t *); 1168 extern int straccess(struct stdata *, enum jcaccess); 1169 1170 extern void entersq(syncq_t *, int); 1171 extern void leavesq(syncq_t *, int); 1172 extern void claimq(queue_t *); 1173 extern void releaseq(queue_t *); 1174 extern void claimstr(queue_t *); 1175 extern void releasestr(queue_t *); 1176 extern void removeq(queue_t *); 1177 extern void insertq(struct stdata *, queue_t *); 1178 extern void drain_syncq(syncq_t *); 1179 extern void qfill_syncq(syncq_t *, queue_t *, mblk_t *); 1180 extern void qdrain_syncq(syncq_t *, queue_t *); 1181 extern int flush_syncq(syncq_t *, queue_t *); 1182 extern void wait_sq_svc(syncq_t *); 1183 1184 extern void outer_enter(syncq_t *, uint16_t); 1185 extern void outer_exit(syncq_t *); 1186 extern void qwriter_inner(queue_t *, mblk_t *, void (*)()); 1187 extern void qwriter_outer(queue_t *, mblk_t *, void (*)()); 1188 1189 extern callbparams_t *callbparams_alloc(syncq_t *, void (*)(void *), 1190 void *, int); 1191 extern void callbparams_free(syncq_t *, callbparams_t *); 1192 extern void callbparams_free_id(syncq_t *, callbparams_id_t, int32_t); 1193 extern void qcallbwrapper(void *); 1194 1195 extern mblk_t *esballoc_wait(unsigned char *, size_t, uint_t, frtn_t *); 1196 extern mblk_t *esballoca(unsigned char *, size_t, uint_t, frtn_t *); 1197 extern mblk_t *desballoca(unsigned char *, size_t, uint_t, frtn_t *); 1198 extern int do_sendfp(struct stdata *, struct file *, struct cred *); 1199 extern int frozenstr(queue_t *); 1200 extern size_t xmsgsize(mblk_t *); 1201 1202 extern void putnext_tail(syncq_t *, queue_t *, uint32_t); 1203 extern void stream_willservice(stdata_t *); 1204 extern void stream_runservice(stdata_t *); 1205 1206 extern void strmate(vnode_t *, vnode_t *); 1207 extern queue_t *strvp2wq(vnode_t *); 1208 extern vnode_t *strq2vp(queue_t *); 1209 extern mblk_t *allocb_wait(size_t, uint_t, uint_t, int *); 1210 extern mblk_t *allocb_cred(size_t, cred_t *); 1211 extern mblk_t *allocb_cred_wait(size_t, uint_t, int *, cred_t *); 1212 extern mblk_t *allocb_tmpl(size_t, const mblk_t *); 1213 extern mblk_t *allocb_tryhard(size_t); 1214 extern void mblk_setcred(mblk_t *, cred_t *); 1215 extern void strpollwakeup(vnode_t *, short); 1216 extern int putnextctl_wait(queue_t *, int); 1217 1218 extern int kstrputmsg(struct vnode *, mblk_t *, struct uio *, ssize_t, 1219 unsigned char, int, int); 1220 extern int kstrgetmsg(struct vnode *, mblk_t **, struct uio *, 1221 unsigned char *, int *, clock_t, rval_t *); 1222 1223 extern void strsetrerror(vnode_t *, int, int, errfunc_t); 1224 extern void strsetwerror(vnode_t *, int, int, errfunc_t); 1225 extern void strseteof(vnode_t *, int); 1226 extern void strflushrq(vnode_t *, int); 1227 extern void strsetrputhooks(vnode_t *, uint_t, msgfunc_t, msgfunc_t); 1228 extern void strsetwputhooks(vnode_t *, uint_t, clock_t); 1229 extern void strsetrwputdatahooks(vnode_t *, msgfunc_t, msgfunc_t); 1230 extern int strwaitmark(vnode_t *); 1231 extern void strsignal_nolock(stdata_t *, int, int32_t); 1232 1233 struct multidata_s; 1234 struct pdesc_s; 1235 extern int hcksum_assoc(mblk_t *, struct multidata_s *, struct pdesc_s *, 1236 uint32_t, uint32_t, uint32_t, uint32_t, uint32_t, int); 1237 extern void hcksum_retrieve(mblk_t *, struct multidata_s *, struct pdesc_s *, 1238 uint32_t *, uint32_t *, uint32_t *, uint32_t *, uint32_t *); 1239 extern void lso_info_set(mblk_t *, uint32_t, uint32_t); 1240 extern void lso_info_get(mblk_t *, uint32_t *, uint32_t *); 1241 extern unsigned int bcksum(uchar_t *, int, unsigned int); 1242 extern boolean_t is_vmloaned_mblk(mblk_t *, struct multidata_s *, 1243 struct pdesc_s *); 1244 1245 extern int fmodsw_register(const char *, struct streamtab *, int); 1246 extern int fmodsw_unregister(const char *); 1247 extern fmodsw_impl_t *fmodsw_find(const char *, fmodsw_flags_t); 1248 extern void fmodsw_rele(fmodsw_impl_t *); 1249 1250 extern void freemsgchain(mblk_t *); 1251 extern mblk_t *copymsgchain(mblk_t *); 1252 1253 extern mblk_t *mcopyinuio(struct stdata *, uio_t *, ssize_t, ssize_t, int *); 1254 1255 /* 1256 * shared or externally configured data structures 1257 */ 1258 extern ssize_t strmsgsz; /* maximum stream message size */ 1259 extern ssize_t strctlsz; /* maximum size of ctl message */ 1260 extern int nstrpush; /* maximum number of pushes allowed */ 1261 1262 /* 1263 * Bufcalls related variables. 1264 */ 1265 extern struct bclist strbcalls; /* List of bufcalls */ 1266 extern kmutex_t strbcall_lock; /* Protects the list of bufcalls */ 1267 extern kcondvar_t strbcall_cv; /* Signaling when a bufcall is added */ 1268 extern kcondvar_t bcall_cv; /* wait of executing bufcall completes */ 1269 1270 extern frtn_t frnop; 1271 1272 extern struct kmem_cache *ciputctrl_cache; 1273 extern int n_ciputctrl; 1274 extern int max_n_ciputctrl; 1275 extern int min_n_ciputctrl; 1276 1277 extern cdevsw_impl_t *devimpl; 1278 1279 /* 1280 * esballoc queue for throttling 1281 */ 1282 typedef struct esb_queue { 1283 kmutex_t eq_lock; 1284 uint_t eq_len; /* number of queued messages */ 1285 mblk_t *eq_head; /* head of queue */ 1286 mblk_t *eq_tail; /* tail of queue */ 1287 uint_t eq_flags; /* esballoc queue flags */ 1288 } esb_queue_t; 1289 1290 /* 1291 * esballoc flags for queue processing. 1292 */ 1293 #define ESBQ_PROCESSING 0x01 /* queue is being processed */ 1294 #define ESBQ_TIMER 0x02 /* timer is active */ 1295 1296 extern void esballoc_queue_init(void); 1297 1298 #endif /* _KERNEL */ 1299 1300 /* 1301 * Note: Use of these macros are restricted to kernel/unix and 1302 * intended for the STREAMS framework. 1303 * All modules/drivers should include sys/ddi.h. 1304 * 1305 * Finding related queues 1306 */ 1307 #define _OTHERQ(q) ((q)->q_flag&QREADR? (q)+1: (q)-1) 1308 #define _WR(q) ((q)->q_flag&QREADR? (q)+1: (q)) 1309 #define _RD(q) ((q)->q_flag&QREADR? (q): (q)-1) 1310 #define _SAMESTR(q) (!((q)->q_flag & QEND)) 1311 1312 /* 1313 * These are also declared here for modules/drivers that erroneously 1314 * include strsubr.h after ddi.h or fail to include ddi.h at all. 1315 */ 1316 extern struct queue *OTHERQ(queue_t *); /* stream.h */ 1317 extern struct queue *RD(queue_t *); 1318 extern struct queue *WR(queue_t *); 1319 extern int SAMESTR(queue_t *); 1320 1321 /* 1322 * The following hardware checksum related macros are private 1323 * interfaces that are subject to change without notice. 1324 */ 1325 #ifdef _KERNEL 1326 #define DB_CKSUMSTART(mp) ((mp)->b_datap->db_cksumstart) 1327 #define DB_CKSUMEND(mp) ((mp)->b_datap->db_cksumend) 1328 #define DB_CKSUMSTUFF(mp) ((mp)->b_datap->db_cksumstuff) 1329 #define DB_CKSUMFLAGS(mp) ((mp)->b_datap->db_struioun.cksum.flags) 1330 #define DB_CKSUM16(mp) ((mp)->b_datap->db_cksum16) 1331 #define DB_CKSUM32(mp) ((mp)->b_datap->db_cksum32) 1332 #define DB_LSOFLAGS(mp) ((mp)->b_datap->db_struioun.cksum.flags) 1333 #define DB_LSOMSS(mp) ((mp)->b_datap->db_struioun.cksum.pad) 1334 #endif /* _KERNEL */ 1335 1336 #ifdef __cplusplus 1337 } 1338 #endif 1339 1340 1341 #endif /* _SYS_STRSUBR_H */ 1342