subr_witness.c revision 83366
165557Sjasone/*- 265557Sjasone * Copyright (c) 1998 Berkeley Software Design, Inc. All rights reserved. 365557Sjasone * 465557Sjasone * Redistribution and use in source and binary forms, with or without 565557Sjasone * modification, are permitted provided that the following conditions 665557Sjasone * are met: 765557Sjasone * 1. Redistributions of source code must retain the above copyright 865557Sjasone * notice, this list of conditions and the following disclaimer. 965557Sjasone * 2. Redistributions in binary form must reproduce the above copyright 1065557Sjasone * notice, this list of conditions and the following disclaimer in the 1165557Sjasone * documentation and/or other materials provided with the distribution. 1265557Sjasone * 3. Berkeley Software Design Inc's name may not be used to endorse or 1365557Sjasone * promote products derived from this software without specific prior 1465557Sjasone * written permission. 1565557Sjasone * 1665557Sjasone * THIS SOFTWARE IS PROVIDED BY BERKELEY SOFTWARE DESIGN INC ``AS IS'' AND 1765557Sjasone * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 1865557Sjasone * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 1965557Sjasone * ARE DISCLAIMED. IN NO EVENT SHALL BERKELEY SOFTWARE DESIGN INC BE LIABLE 2065557Sjasone * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2165557Sjasone * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2265557Sjasone * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2365557Sjasone * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2465557Sjasone * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 2565557Sjasone * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 2665557Sjasone * SUCH DAMAGE. 2765557Sjasone * 2865557Sjasone * from BSDI $Id: mutex_witness.c,v 1.1.2.20 2000/04/27 03:10:27 cp Exp $ 2967352Sjhb * and BSDI $Id: synch_machdep.c,v 2.3.2.39 2000/04/27 03:10:25 cp Exp $ 3065557Sjasone * $FreeBSD: head/sys/kern/subr_witness.c 83366 2001-09-12 08:38:13Z julian $ 3165557Sjasone */ 3265557Sjasone 3365557Sjasone/* 3474912Sjhb * Implementation of the `witness' lock verifier. Originally implemented for 3574912Sjhb * mutexes in BSD/OS. Extended to handle generic lock objects and lock 3674912Sjhb * classes in FreeBSD. 3772200Sbmilekic */ 3872200Sbmilekic 3972200Sbmilekic/* 4065557Sjasone * Main Entry: witness 4165557Sjasone * Pronunciation: 'wit-n&s 4265557Sjasone * Function: noun 4365557Sjasone * Etymology: Middle English witnesse, from Old English witnes knowledge, 4465557Sjasone * testimony, witness, from 2wit 4565557Sjasone * Date: before 12th century 4665557Sjasone * 1 : attestation of a fact or event : TESTIMONY 4765557Sjasone * 2 : one that gives evidence; specifically : one who testifies in 4865557Sjasone * a cause or before a judicial tribunal 4965557Sjasone * 3 : one asked to be present at a transaction so as to be able to 5065557Sjasone * testify to its having taken place 5165557Sjasone * 4 : one who has personal knowledge of something 5265557Sjasone * 5 a : something serving as evidence or proof : SIGN 5365557Sjasone * b : public affirmation by word or example of usually 5465557Sjasone * religious faith or conviction <the heroic witness to divine 5565557Sjasone * life -- Pilot> 5665557Sjasone * 6 capitalized : a member of the Jehovah's Witnesses 5765557Sjasone */ 5865557Sjasone 5968790Sjhb#include "opt_ddb.h" 6067676Sjhb#include "opt_witness.h" 6167676Sjhb 6265557Sjasone#include <sys/param.h> 6367352Sjhb#include <sys/bus.h> 6467352Sjhb#include <sys/kernel.h> 6574912Sjhb#include <sys/ktr.h> 6674912Sjhb#include <sys/lock.h> 6767352Sjhb#include <sys/malloc.h> 6874912Sjhb#include <sys/mutex.h> 6965557Sjasone#include <sys/proc.h> 7067676Sjhb#include <sys/sysctl.h> 7165557Sjasone#include <sys/systm.h> 7265557Sjasone 7368790Sjhb#include <ddb/ddb.h> 7468790Sjhb 7574912Sjhb#define WITNESS_COUNT 200 7674912Sjhb#define WITNESS_CHILDCOUNT (WITNESS_COUNT * 4) 7765557Sjasone/* 7874912Sjhb * XXX: This is somewhat bogus, as we assume here that at most 1024 processes 7974912Sjhb * will hold LOCK_NCHILDREN * 2 locks. We handle failure ok, and we should 8074912Sjhb * probably be safe for the most part, but it's still a SWAG. 8167352Sjhb */ 8274912Sjhb#define LOCK_CHILDCOUNT (MAXCPU + 1024) * 2 8371352Sjasone 8474912Sjhb#define WITNESS_NCHILDREN 6 8571352Sjasone 8674912Sjhbstruct witness_child_list_entry; 8771352Sjasone 8874912Sjhbstruct witness { 8974912Sjhb const char *w_name; 9074912Sjhb struct lock_class *w_class; 9174912Sjhb STAILQ_ENTRY(witness) w_list; /* List of all witnesses. */ 9274912Sjhb STAILQ_ENTRY(witness) w_typelist; /* Witnesses of a type. */ 9374912Sjhb struct witness_child_list_entry *w_children; /* Great evilness... */ 9474912Sjhb const char *w_file; 9574912Sjhb int w_line; 9674912Sjhb u_int w_level; 9774912Sjhb u_int w_refcount; 9874912Sjhb u_char w_Giant_squawked:1; 9974912Sjhb u_char w_other_squawked:1; 10074912Sjhb u_char w_same_squawked:1; 10174912Sjhb}; 10271352Sjasone 10374912Sjhbstruct witness_child_list_entry { 10474912Sjhb struct witness_child_list_entry *wcl_next; 10574912Sjhb struct witness *wcl_children[WITNESS_NCHILDREN]; 10674912Sjhb u_int wcl_count; 10774912Sjhb}; 10871352Sjasone 10974912SjhbSTAILQ_HEAD(witness_list, witness); 11071352Sjasone 11174912Sjhbstruct witness_blessed { 11274912Sjhb const char *b_lock1; 11374912Sjhb const char *b_lock2; 11474912Sjhb}; 11571352Sjasone 11674912Sjhbstruct witness_order_list_entry { 11774912Sjhb const char *w_name; 11874912Sjhb struct lock_class *w_class; 11974912Sjhb}; 12071352Sjasone 12174912Sjhbstatic struct witness *enroll(const char *description, 12274912Sjhb struct lock_class *lock_class); 12374912Sjhbstatic int itismychild(struct witness *parent, struct witness *child); 12474912Sjhbstatic void removechild(struct witness *parent, struct witness *child); 12574912Sjhbstatic int isitmychild(struct witness *parent, struct witness *child); 12674912Sjhbstatic int isitmydescendant(struct witness *parent, struct witness *child); 12774912Sjhbstatic int dup_ok(struct witness *); 12874912Sjhbstatic int blessed(struct witness *, struct witness *); 12974912Sjhbstatic void witness_display_list(void(*prnt)(const char *fmt, ...), 13074912Sjhb struct witness_list *list); 13174912Sjhbstatic void witness_displaydescendants(void(*)(const char *fmt, ...), 13274912Sjhb struct witness *); 13374912Sjhbstatic void witness_leveldescendents(struct witness *parent, int level); 13474912Sjhbstatic void witness_levelall(void); 13574912Sjhbstatic struct witness *witness_get(void); 13674912Sjhbstatic void witness_free(struct witness *m); 13774912Sjhbstatic struct witness_child_list_entry *witness_child_get(void); 13874912Sjhbstatic void witness_child_free(struct witness_child_list_entry *wcl); 13974912Sjhbstatic struct lock_list_entry *witness_lock_list_get(void); 14074912Sjhbstatic void witness_lock_list_free(struct lock_list_entry *lle); 14174912Sjhbstatic void witness_display(void(*)(const char *fmt, ...)); 14276272Sjhbstatic struct lock_instance *find_instance(struct lock_list_entry *lock_list, 14376272Sjhb struct lock_object *lock); 14472200Sbmilekic 14574912SjhbMALLOC_DEFINE(M_WITNESS, "witness", "witness structure"); 14672200Sbmilekic 14777843Speterstatic int witness_watch = 1; 14877900SpeterTUNABLE_INT("debug.witness_watch", &witness_watch); 14974912SjhbSYSCTL_INT(_debug, OID_AUTO, witness_watch, CTLFLAG_RD, &witness_watch, 0, ""); 15071352Sjasone 15167352Sjhb#ifdef DDB 15272200Sbmilekic/* 15367676Sjhb * When DDB is enabled and witness_ddb is set to 1, it will cause the system to 15465557Sjasone * drop into kdebug() when: 15565557Sjasone * - a lock heirarchy violation occurs 15665557Sjasone * - locks are held when going to sleep. 15765557Sjasone */ 15867676Sjhb#ifdef WITNESS_DDB 15977843Speterint witness_ddb = 1; 16067676Sjhb#else 16177843Speterint witness_ddb = 0; 16265557Sjasone#endif 16377900SpeterTUNABLE_INT("debug.witness_ddb", &witness_ddb); 16467676SjhbSYSCTL_INT(_debug, OID_AUTO, witness_ddb, CTLFLAG_RW, &witness_ddb, 0, ""); 16567676Sjhb#endif /* DDB */ 16665557Sjasone 16767676Sjhb#ifdef WITNESS_SKIPSPIN 16877843Speterint witness_skipspin = 1; 16967676Sjhb#else 17077843Speterint witness_skipspin = 0; 17165557Sjasone#endif 17277900SpeterTUNABLE_INT("debug.witness_skipspin", &witness_skipspin); 17367676SjhbSYSCTL_INT(_debug, OID_AUTO, witness_skipspin, CTLFLAG_RD, &witness_skipspin, 0, 17467676Sjhb ""); 17565557Sjasone 17674912Sjhbstatic struct mtx w_mtx; 17774912Sjhbstatic struct witness_list w_free = STAILQ_HEAD_INITIALIZER(w_free); 17874912Sjhbstatic struct witness_list w_all = STAILQ_HEAD_INITIALIZER(w_all); 17974912Sjhbstatic struct witness_list w_spin = STAILQ_HEAD_INITIALIZER(w_spin); 18074912Sjhbstatic struct witness_list w_sleep = STAILQ_HEAD_INITIALIZER(w_sleep); 18174912Sjhbstatic struct witness_child_list_entry *w_child_free = NULL; 18274912Sjhbstatic struct lock_list_entry *w_lock_list_free = NULL; 18374912Sjhbstatic int witness_dead; /* fatal error, probably no memory */ 18465557Sjasone 18574912Sjhbstatic struct witness w_data[WITNESS_COUNT]; 18674912Sjhbstatic struct witness_child_list_entry w_childdata[WITNESS_CHILDCOUNT]; 18774912Sjhbstatic struct lock_list_entry w_locklistdata[LOCK_CHILDCOUNT]; 18865557Sjasone 18974912Sjhbstatic struct witness_order_list_entry order_lists[] = { 19074912Sjhb { "Giant", &lock_class_mtx_sleep }, 19174912Sjhb { "proctree", &lock_class_sx }, 19274912Sjhb { "allproc", &lock_class_sx }, 19374912Sjhb { "process lock", &lock_class_mtx_sleep }, 19474912Sjhb { "uidinfo hash", &lock_class_mtx_sleep }, 19574912Sjhb { "uidinfo struct", &lock_class_mtx_sleep }, 19674912Sjhb { NULL, NULL }, 19775464Sjhb /* 19875464Sjhb * spin locks 19975464Sjhb */ 20072224Sjhb#if defined(__i386__) && defined (SMP) 20174912Sjhb { "com", &lock_class_mtx_spin }, 20272224Sjhb#endif 20374912Sjhb { "sio", &lock_class_mtx_spin }, 20472224Sjhb#ifdef __i386__ 20574912Sjhb { "cy", &lock_class_mtx_spin }, 20672224Sjhb#endif 20774912Sjhb { "ng_node", &lock_class_mtx_spin }, 20874912Sjhb { "ng_worklist", &lock_class_mtx_spin }, 20974912Sjhb { "ithread table lock", &lock_class_mtx_spin }, 21074912Sjhb { "sched lock", &lock_class_mtx_spin }, 21174912Sjhb { "callout", &lock_class_mtx_spin }, 21265557Sjasone /* 21365557Sjasone * leaf locks 21465557Sjasone */ 21572224Sjhb#ifdef SMP 21675464Sjhb { "ap boot", &lock_class_mtx_spin }, 21771576Sjasone#ifdef __i386__ 21874912Sjhb { "imen", &lock_class_mtx_spin }, 21971576Sjasone#endif 22074912Sjhb { "smp rendezvous", &lock_class_mtx_spin }, 22172224Sjhb#endif 22278785Sjhb { "clk", &lock_class_mtx_spin }, 22374912Sjhb { NULL, NULL }, 22474912Sjhb { NULL, NULL } 22565557Sjasone}; 22665557Sjasone 22774912Sjhbstatic const char *dup_list[] = { 22873912Sjhb "process lock", 22965557Sjasone NULL 23065557Sjasone}; 23165557Sjasone 23265557Sjasone/* 23365557Sjasone * Pairs of locks which have been blessed 23465557Sjasone * Don't complain about order problems with blessed locks 23565557Sjasone */ 23665856Sjhbstatic struct witness_blessed blessed_list[] = { 23765557Sjasone}; 23872200Sbmilekicstatic int blessed_count = 23972200Sbmilekic sizeof(blessed_list) / sizeof(struct witness_blessed); 24065557Sjasone 24174912Sjhb/* 24274912Sjhb * List of all locks in the system. 24374912Sjhb */ 24474912SjhbSTAILQ_HEAD(, lock_object) all_locks = STAILQ_HEAD_INITIALIZER(all_locks); 24574912Sjhb 24674912Sjhbstatic struct mtx all_mtx = { 24774912Sjhb { &lock_class_mtx_sleep, /* mtx_object.lo_class */ 24874912Sjhb "All locks list", /* mtx_object.lo_name */ 24974912Sjhb LO_INITIALIZED, /* mtx_object.lo_flags */ 25074912Sjhb { NULL }, /* mtx_object.lo_list */ 25174912Sjhb NULL }, /* mtx_object.lo_witness */ 25274912Sjhb MTX_UNOWNED, 0, /* mtx_lock, mtx_recurse */ 25374912Sjhb 0, /* mtx_savecrit */ 25474912Sjhb TAILQ_HEAD_INITIALIZER(all_mtx.mtx_blocked), 25574912Sjhb { NULL, NULL } /* mtx_contested */ 25674912Sjhb}; 25774912Sjhb 25874912Sjhb/* 25974912Sjhb * This global is set to 0 once it becomes safe to use the witness code. 26074912Sjhb */ 26174912Sjhbstatic int witness_cold = 1; 26274912Sjhb 26374912Sjhb/* 26474912Sjhb * Global variables for book keeping. 26574912Sjhb */ 26674912Sjhbstatic int lock_cur_cnt; 26774912Sjhbstatic int lock_max_cnt; 26874912Sjhb 26974912Sjhb/* 27074912Sjhb * The WITNESS-enabled diagnostic code. 27174912Sjhb */ 27271352Sjasonestatic void 27374912Sjhbwitness_initialize(void *dummy __unused) 27465557Sjasone{ 27574912Sjhb struct lock_object *lock; 27674912Sjhb struct witness_order_list_entry *order; 27774912Sjhb struct witness *w, *w1; 27874912Sjhb int i; 27965557Sjasone 28074912Sjhb /* 28174912Sjhb * We have to release Giant before initializing its witness 28274912Sjhb * structure so that WITNESS doesn't get confused. 28374912Sjhb */ 28474912Sjhb mtx_unlock(&Giant); 28574912Sjhb mtx_assert(&Giant, MA_NOTOWNED); 28674912Sjhb 28778871Sjhb CTR0(KTR_WITNESS, __func__ ": initializing witness"); 28874912Sjhb STAILQ_INSERT_HEAD(&all_locks, &all_mtx.mtx_object, lo_list); 28974912Sjhb mtx_init(&w_mtx, "witness lock", MTX_SPIN | MTX_QUIET | MTX_NOWITNESS); 29074912Sjhb for (i = 0; i < WITNESS_COUNT; i++) 29174912Sjhb witness_free(&w_data[i]); 29274912Sjhb for (i = 0; i < WITNESS_CHILDCOUNT; i++) 29374912Sjhb witness_child_free(&w_childdata[i]); 29474912Sjhb for (i = 0; i < LOCK_CHILDCOUNT; i++) 29574912Sjhb witness_lock_list_free(&w_locklistdata[i]); 29674912Sjhb 29774912Sjhb /* First add in all the specified order lists. */ 29874912Sjhb for (order = order_lists; order->w_name != NULL; order++) { 29974912Sjhb w = enroll(order->w_name, order->w_class); 30075569Sjhb if (w == NULL) 30175569Sjhb continue; 30274912Sjhb w->w_file = "order list"; 30374912Sjhb for (order++; order->w_name != NULL; order++) { 30474912Sjhb w1 = enroll(order->w_name, order->w_class); 30575569Sjhb if (w1 == NULL) 30675569Sjhb continue; 30774912Sjhb w1->w_file = "order list"; 30874912Sjhb itismychild(w, w1); 30974912Sjhb w = w1; 31065557Sjasone } 31165557Sjasone } 31265557Sjasone 31374912Sjhb /* Iterate through all locks and add them to witness. */ 31474912Sjhb mtx_lock(&all_mtx); 31574912Sjhb STAILQ_FOREACH(lock, &all_locks, lo_list) { 31674912Sjhb if (lock->lo_flags & LO_WITNESS) 31774912Sjhb lock->lo_witness = enroll(lock->lo_name, 31874912Sjhb lock->lo_class); 31974912Sjhb else 32074912Sjhb lock->lo_witness = NULL; 32174912Sjhb } 32274912Sjhb mtx_unlock(&all_mtx); 32374912Sjhb 32474912Sjhb /* Mark the witness code as being ready for use. */ 32574912Sjhb atomic_store_rel_int(&witness_cold, 0); 32674912Sjhb 32774912Sjhb mtx_lock(&Giant); 32865557Sjasone} 32974912SjhbSYSINIT(witness_init, SI_SUB_WITNESS, SI_ORDER_FIRST, witness_initialize, NULL) 33065557Sjasone 33174912Sjhbvoid 33274912Sjhbwitness_init(struct lock_object *lock) 33374912Sjhb{ 33474912Sjhb struct lock_class *class; 33574912Sjhb 33674912Sjhb class = lock->lo_class; 33774912Sjhb if (lock->lo_flags & LO_INITIALIZED) 33882284Sjhb panic("%s: lock (%s) %s is already initialized", __func__, 33974912Sjhb class->lc_name, lock->lo_name); 34074912Sjhb if ((lock->lo_flags & LO_RECURSABLE) != 0 && 34174912Sjhb (class->lc_flags & LC_RECURSABLE) == 0) 34282284Sjhb panic("%s: lock (%s) %s can not be recursable", __func__, 34374912Sjhb class->lc_name, lock->lo_name); 34474912Sjhb if ((lock->lo_flags & LO_SLEEPABLE) != 0 && 34574912Sjhb (class->lc_flags & LC_SLEEPABLE) == 0) 34682284Sjhb panic("%s: lock (%s) %s can not be sleepable", __func__, 34774912Sjhb class->lc_name, lock->lo_name); 34882244Sjhb if ((lock->lo_flags & LO_UPGRADABLE) != 0 && 34982244Sjhb (class->lc_flags & LC_UPGRADABLE) == 0) 35082284Sjhb panic("%s: lock (%s) %s can not be upgradable", __func__, 35182244Sjhb class->lc_name, lock->lo_name); 35282244Sjhb 35374912Sjhb mtx_lock(&all_mtx); 35474912Sjhb STAILQ_INSERT_TAIL(&all_locks, lock, lo_list); 35574912Sjhb lock->lo_flags |= LO_INITIALIZED; 35674912Sjhb lock_cur_cnt++; 35774912Sjhb if (lock_cur_cnt > lock_max_cnt) 35874912Sjhb lock_max_cnt = lock_cur_cnt; 35974912Sjhb mtx_unlock(&all_mtx); 36080747Sjhb if (!witness_cold && !witness_dead && panicstr == NULL && 36174912Sjhb (lock->lo_flags & LO_WITNESS) != 0) 36274912Sjhb lock->lo_witness = enroll(lock->lo_name, class); 36374912Sjhb else 36474912Sjhb lock->lo_witness = NULL; 36574912Sjhb} 36674912Sjhb 36774912Sjhbvoid 36874912Sjhbwitness_destroy(struct lock_object *lock) 36974912Sjhb{ 37075362Sjhb struct witness *w; 37174912Sjhb 37274912Sjhb if (witness_cold) 37374912Sjhb panic("lock (%s) %s destroyed while witness_cold", 37474912Sjhb lock->lo_class->lc_name, lock->lo_name); 37574912Sjhb if ((lock->lo_flags & LO_INITIALIZED) == 0) 37682284Sjhb panic("%s: lock (%s) %s is not initialized", __func__, 37774912Sjhb lock->lo_class->lc_name, lock->lo_name); 37874912Sjhb 37976272Sjhb /* XXX: need to verify that no one holds the lock */ 38075362Sjhb w = lock->lo_witness; 38175362Sjhb if (w != NULL) { 38275362Sjhb mtx_lock_spin(&w_mtx); 38375362Sjhb w->w_refcount--; 38475362Sjhb if (w->w_refcount == 0) { 38578871Sjhb CTR1(KTR_WITNESS, 38678871Sjhb __func__ ": marking witness %s as dead", w->w_name); 38775362Sjhb w->w_name = "(dead)"; 38875362Sjhb w->w_file = "(dead)"; 38975362Sjhb w->w_line = 0; 39075362Sjhb } 39175362Sjhb mtx_unlock_spin(&w_mtx); 39275362Sjhb } 39375362Sjhb 39474912Sjhb mtx_lock(&all_mtx); 39574912Sjhb lock_cur_cnt--; 39674912Sjhb STAILQ_REMOVE(&all_locks, lock, lock_object, lo_list); 39780055Sjhb lock->lo_flags &= ~LO_INITIALIZED; 39874912Sjhb mtx_unlock(&all_mtx); 39974912Sjhb} 40074912Sjhb 40171352Sjasonestatic void 40274912Sjhbwitness_display_list(void(*prnt)(const char *fmt, ...), 40374912Sjhb struct witness_list *list) 40471352Sjasone{ 40571352Sjasone struct witness *w, *w1; 40674912Sjhb int found; 40771352Sjasone 40874912Sjhb STAILQ_FOREACH(w, list, w_typelist) { 40974912Sjhb if (w->w_file == NULL) 41071352Sjasone continue; 41174912Sjhb found = 0; 41274912Sjhb STAILQ_FOREACH(w1, list, w_typelist) { 41374912Sjhb if (isitmychild(w1, w)) { 41474912Sjhb found++; 41571352Sjasone break; 41674912Sjhb } 41771352Sjasone } 41874912Sjhb if (found) 41971352Sjasone continue; 42071352Sjasone /* 42171352Sjasone * This lock has no anscestors, display its descendants. 42271352Sjasone */ 42371352Sjasone witness_displaydescendants(prnt, w); 42471352Sjasone } 42574912Sjhb} 42672224Sjhb 42774912Sjhbstatic void 42874912Sjhbwitness_display(void(*prnt)(const char *fmt, ...)) 42974912Sjhb{ 43074912Sjhb struct witness *w; 43174912Sjhb 43282284Sjhb KASSERT(!witness_cold, ("%s: witness_cold", __func__)); 43374912Sjhb witness_levelall(); 43474912Sjhb 43572224Sjhb /* 43674930Sjhb * First, handle sleep locks which have been acquired at least 43774912Sjhb * once. 43874912Sjhb */ 43974912Sjhb prnt("Sleep locks:\n"); 44074912Sjhb witness_display_list(prnt, &w_sleep); 44174912Sjhb 44274912Sjhb /* 44374930Sjhb * Now do spin locks which have been acquired at least once. 44472224Sjhb */ 44574912Sjhb prnt("\nSpin locks:\n"); 44674912Sjhb witness_display_list(prnt, &w_spin); 44772224Sjhb 44872224Sjhb /* 44974930Sjhb * Finally, any locks which have not been acquired yet. 45072224Sjhb */ 45174912Sjhb prnt("\nLocks which were never acquired:\n"); 45274912Sjhb STAILQ_FOREACH(w, &w_all, w_list) { 45371352Sjasone if (w->w_file != NULL) 45471352Sjasone continue; 45574912Sjhb prnt("%s\n", w->w_name); 45671352Sjasone } 45771352Sjasone} 45871352Sjasone 45965557Sjasonevoid 46074912Sjhbwitness_lock(struct lock_object *lock, int flags, const char *file, int line) 46165557Sjasone{ 46274912Sjhb struct lock_list_entry **lock_list, *lle; 46376272Sjhb struct lock_instance *lock1, *lock2; 46474912Sjhb struct lock_class *class; 46565856Sjhb struct witness *w, *w1; 46665557Sjasone struct proc *p; 46783366Sjulian struct thread *td; 46874912Sjhb int i, j; 46967676Sjhb#ifdef DDB 47067676Sjhb int go_into_ddb = 0; 47167676Sjhb#endif /* DDB */ 47265557Sjasone 47374912Sjhb if (witness_cold || witness_dead || lock->lo_witness == NULL || 47480747Sjhb panicstr != NULL) 47571320Sjasone return; 47674912Sjhb w = lock->lo_witness; 47774912Sjhb class = lock->lo_class; 47883366Sjulian td = curthread; 47983366Sjulian p = td->td_proc; 48065557Sjasone 48174944Sjhb /* 48274944Sjhb * We have to hold a spinlock to keep lock_list valid across the check 48374944Sjhb * in the LC_SLEEPLOCK case. In the LC_SPINLOCK case, it is already 48474944Sjhb * protected by the spinlock we are currently performing the witness 48574944Sjhb * checks on, so it is ok to release the lock after performing this 48674944Sjhb * check. All we have to protect is the LC_SLEEPLOCK case when no 48774944Sjhb * spinlocks are held as we may get preempted during this check and 48874944Sjhb * lock_list could end up pointing to some other CPU's spinlock list. 48974944Sjhb */ 49074944Sjhb mtx_lock_spin(&w_mtx); 49174912Sjhb lock_list = PCPU_PTR(spinlocks); 49274912Sjhb if (class->lc_flags & LC_SLEEPLOCK) { 49376772Sjhb if (*lock_list != NULL && (flags & LOP_TRYLOCK) == 0) { 49474944Sjhb mtx_unlock_spin(&w_mtx); 49574912Sjhb panic("blockable sleep lock (%s) %s @ %s:%d", 49674912Sjhb class->lc_name, lock->lo_name, file, line); 49774944Sjhb } 49883366Sjulian lock_list = &td->td_sleeplocks; 49974912Sjhb } 50074944Sjhb mtx_unlock_spin(&w_mtx); 50165557Sjasone 50276772Sjhb /* 50376772Sjhb * Try locks do not block if they fail to acquire the lock, thus 50476772Sjhb * there is no danger of deadlocks or of switching while holding a 50576772Sjhb * spin lock if we acquire a lock via a try operation. 50676772Sjhb */ 50774912Sjhb if (flags & LOP_TRYLOCK) 50865557Sjasone goto out; 50965557Sjasone 51065557Sjasone /* 51174912Sjhb * Is this the first lock acquired? If so, then no order checking 51274912Sjhb * is needed. 51365557Sjasone */ 51474912Sjhb if (*lock_list == NULL) 51565557Sjasone goto out; 51665557Sjasone 51774912Sjhb /* 51876272Sjhb * Check to see if we are recursing on a lock we already own. 51976272Sjhb */ 52076272Sjhb lock1 = find_instance(*lock_list, lock); 52176272Sjhb if (lock1 != NULL) { 52276272Sjhb if ((lock1->li_flags & LI_EXCLUSIVE) != 0 && 52376272Sjhb (flags & LOP_EXCLUSIVE) == 0) { 52476272Sjhb printf("shared lock of (%s) %s @ %s:%d\n", 52576272Sjhb class->lc_name, lock->lo_name, file, line); 52676272Sjhb printf("while exclusively locked from %s:%d\n", 52776272Sjhb lock1->li_file, lock1->li_line); 52876272Sjhb panic("share->excl"); 52976272Sjhb } 53076272Sjhb if ((lock1->li_flags & LI_EXCLUSIVE) == 0 && 53176272Sjhb (flags & LOP_EXCLUSIVE) != 0) { 53276272Sjhb printf("exclusive lock of (%s) %s @ %s:%d\n", 53376272Sjhb class->lc_name, lock->lo_name, file, line); 53476272Sjhb printf("while share locked from %s:%d\n", 53576272Sjhb lock1->li_file, lock1->li_line); 53676272Sjhb panic("excl->share"); 53776272Sjhb } 53876272Sjhb lock1->li_flags++; 53976272Sjhb if ((lock->lo_flags & LO_RECURSABLE) == 0) { 54076272Sjhb printf( 54176272Sjhb "recursed on non-recursive lock (%s) %s @ %s:%d\n", 54276272Sjhb class->lc_name, lock->lo_name, file, line); 54376272Sjhb printf("first acquired @ %s:%d\n", lock1->li_file, 54476272Sjhb lock1->li_line); 54576272Sjhb panic("recurse"); 54676272Sjhb } 54778871Sjhb CTR3(KTR_WITNESS, __func__ ": pid %d recursed on %s r=%d", 54878785Sjhb curproc->p_pid, lock->lo_name, 54978785Sjhb lock1->li_flags & LI_RECURSEMASK); 55076272Sjhb lock1->li_file = file; 55176272Sjhb lock1->li_line = line; 55276272Sjhb return; 55376272Sjhb } 55476272Sjhb 55576272Sjhb /* 55674912Sjhb * Check for duplicate locks of the same type. Note that we only 55774912Sjhb * have to check for this on the last lock we just acquired. Any 55874912Sjhb * other cases will be caught as lock order violations. 55974912Sjhb */ 56076272Sjhb lock1 = &(*lock_list)->ll_children[(*lock_list)->ll_count - 1]; 56176272Sjhb w1 = lock1->li_lock->lo_witness; 56274912Sjhb if (w1 == w) { 56365557Sjasone if (w->w_same_squawked || dup_ok(w)) 56465557Sjasone goto out; 56565557Sjasone w->w_same_squawked = 1; 56675755Sjhb printf("acquiring duplicate lock of same type: \"%s\"\n", 56774912Sjhb lock->lo_name); 56876272Sjhb printf(" 1st @ %s:%d\n", lock1->li_file, lock1->li_line); 56965557Sjasone printf(" 2nd @ %s:%d\n", file, line); 57067676Sjhb#ifdef DDB 57167676Sjhb go_into_ddb = 1; 57267676Sjhb#endif /* DDB */ 57365557Sjasone goto out; 57465557Sjasone } 57565557Sjasone MPASS(!mtx_owned(&w_mtx)); 57674912Sjhb mtx_lock_spin(&w_mtx); 57765557Sjasone /* 57865557Sjasone * If we have a known higher number just say ok 57965557Sjasone */ 58065557Sjasone if (witness_watch > 1 && w->w_level > w1->w_level) { 58174912Sjhb mtx_unlock_spin(&w_mtx); 58265557Sjasone goto out; 58365557Sjasone } 58474912Sjhb if (isitmydescendant(w1, w)) { 58574912Sjhb mtx_unlock_spin(&w_mtx); 58665557Sjasone goto out; 58765557Sjasone } 58874912Sjhb for (j = 0, lle = *lock_list; lle != NULL; lle = lle->ll_next) { 58974912Sjhb for (i = lle->ll_count - 1; i >= 0; i--, j++) { 59065557Sjasone 59174912Sjhb MPASS(j < WITNESS_COUNT); 59276272Sjhb lock1 = &lle->ll_children[i]; 59376272Sjhb w1 = lock1->li_lock->lo_witness; 59474912Sjhb 59574912Sjhb /* 59674912Sjhb * If this lock doesn't undergo witness checking, 59774912Sjhb * then skip it. 59874912Sjhb */ 59974912Sjhb if (w1 == NULL) { 60076272Sjhb KASSERT((lock1->li_lock->lo_flags & LO_WITNESS) == 0, 60174912Sjhb ("lock missing witness structure")); 60274912Sjhb continue; 60374912Sjhb } 60476272Sjhb /* 60576272Sjhb * If we are locking Giant and we slept with this 60676272Sjhb * lock, then skip it. 60776272Sjhb */ 60876272Sjhb if ((lock1->li_flags & LI_SLEPT) != 0 && 60976272Sjhb lock == &Giant.mtx_object) 61076272Sjhb continue; 61174912Sjhb if (!isitmydescendant(w, w1)) 61274912Sjhb continue; 61374912Sjhb /* 61474912Sjhb * We have a lock order violation, check to see if it 61574912Sjhb * is allowed or has already been yelled about. 61674912Sjhb */ 61774912Sjhb mtx_unlock_spin(&w_mtx); 61865557Sjasone if (blessed(w, w1)) 61965557Sjasone goto out; 62076272Sjhb if (lock1->li_lock == &Giant.mtx_object) { 62165557Sjasone if (w1->w_Giant_squawked) 62265557Sjasone goto out; 62365557Sjasone else 62465557Sjasone w1->w_Giant_squawked = 1; 62565557Sjasone } else { 62665557Sjasone if (w1->w_other_squawked) 62765557Sjasone goto out; 62865557Sjasone else 62965557Sjasone w1->w_other_squawked = 1; 63065557Sjasone } 63174912Sjhb /* 63274912Sjhb * Ok, yell about it. 63374912Sjhb */ 63465557Sjasone printf("lock order reversal\n"); 63574912Sjhb /* 63674912Sjhb * Try to locate an earlier lock with 63774912Sjhb * witness w in our list. 63874912Sjhb */ 63974912Sjhb do { 64076272Sjhb lock2 = &lle->ll_children[i]; 64176272Sjhb MPASS(lock2->li_lock != NULL); 64276272Sjhb if (lock2->li_lock->lo_witness == w) 64374912Sjhb break; 64474912Sjhb i--; 64574912Sjhb if (i == 0 && lle->ll_next != NULL) { 64674912Sjhb lle = lle->ll_next; 64774912Sjhb i = lle->ll_count - 1; 64874912Sjhb MPASS(i != 0); 64974912Sjhb } 65074912Sjhb } while (i >= 0); 65176272Sjhb if (i < 0) { 65276272Sjhb printf(" 1st %p %s @ %s:%d\n", lock1->li_lock, 65376272Sjhb lock1->li_lock->lo_name, lock1->li_file, 65476272Sjhb lock1->li_line); 65576272Sjhb printf(" 2nd %p %s @ %s:%d\n", lock, 65676272Sjhb lock->lo_name, file, line); 65776272Sjhb } else { 65876272Sjhb printf(" 1st %p %s @ %s:%d\n", lock2->li_lock, 65976272Sjhb lock2->li_lock->lo_name, lock2->li_file, 66076272Sjhb lock2->li_line); 66176272Sjhb printf(" 2nd %p %s @ %s:%d\n", lock1->li_lock, 66276272Sjhb lock1->li_lock->lo_name, lock1->li_file, 66376272Sjhb lock1->li_line); 66476272Sjhb printf(" 3rd %p %s @ %s:%d\n", lock, 66576272Sjhb lock->lo_name, file, line); 66676272Sjhb } 66767676Sjhb#ifdef DDB 66867676Sjhb go_into_ddb = 1; 66967676Sjhb#endif /* DDB */ 67065557Sjasone goto out; 67165557Sjasone } 67265557Sjasone } 67376272Sjhb lock1 = &(*lock_list)->ll_children[(*lock_list)->ll_count - 1]; 67478871Sjhb /* 67578871Sjhb * Don't build a new relationship if we are locking Giant just 67678871Sjhb * after waking up and the previous lock in the list was acquired 67778871Sjhb * prior to blocking. 67878871Sjhb */ 67978871Sjhb if (lock == &Giant.mtx_object && (lock1->li_flags & LI_SLEPT) != 0) 68074912Sjhb mtx_unlock_spin(&w_mtx); 68178871Sjhb else { 68278871Sjhb CTR2(KTR_WITNESS, __func__ ": adding %s as a child of %s", 68378871Sjhb lock->lo_name, lock1->li_lock->lo_name); 68478871Sjhb if (!itismychild(lock1->li_lock->lo_witness, w)) 68578871Sjhb mtx_unlock_spin(&w_mtx); 68678871Sjhb } 68765557Sjasone 68865557Sjasoneout: 68967676Sjhb#ifdef DDB 69067676Sjhb if (witness_ddb && go_into_ddb) 69175711Sjhb Debugger(__func__); 69267676Sjhb#endif /* DDB */ 69365557Sjasone w->w_file = file; 69465557Sjasone w->w_line = line; 69574912Sjhb 69674912Sjhb lle = *lock_list; 69776272Sjhb if (lle == NULL || lle->ll_count == LOCK_NCHILDREN) { 69878785Sjhb lle = witness_lock_list_get(); 69978785Sjhb if (lle == NULL) 70065557Sjasone return; 70178785Sjhb lle->ll_next = *lock_list; 70278871Sjhb CTR2(KTR_WITNESS, __func__ ": pid %d added lle %p", 70378785Sjhb curproc->p_pid, lle); 70478785Sjhb *lock_list = lle; 70565557Sjasone } 70676272Sjhb lock1 = &lle->ll_children[lle->ll_count++]; 70776272Sjhb lock1->li_lock = lock; 70876272Sjhb lock1->li_line = line; 70976272Sjhb lock1->li_file = file; 71076272Sjhb if ((flags & LOP_EXCLUSIVE) != 0) 71176272Sjhb lock1->li_flags = LI_EXCLUSIVE; 71276272Sjhb else 71376272Sjhb lock1->li_flags = 0; 71478871Sjhb CTR3(KTR_WITNESS, __func__ ": pid %d added %s as lle[%d]", 71578785Sjhb curproc->p_pid, lock->lo_name, lle->ll_count - 1); 71665557Sjasone} 71765557Sjasone 71865557Sjasonevoid 71982244Sjhbwitness_upgrade(struct lock_object *lock, int flags, const char *file, int line) 72082244Sjhb{ 72182244Sjhb struct lock_instance *instance; 72282244Sjhb struct lock_class *class; 72382244Sjhb 72482284Sjhb KASSERT(!witness_cold, ("%s: witness_cold", __func__)); 72582244Sjhb if (lock->lo_witness == NULL || witness_dead || panicstr != NULL) 72682244Sjhb return; 72782244Sjhb class = lock->lo_class; 72882244Sjhb if ((lock->lo_flags & LO_UPGRADABLE) == 0) 72982244Sjhb panic("upgrade of non-upgradable lock (%s) %s @ %s:%d", 73082244Sjhb class->lc_name, lock->lo_name, file, line); 73182244Sjhb if ((flags & LOP_TRYLOCK) == 0) 73282244Sjhb panic("non-try upgrade of lock (%s) %s @ %s:%d", class->lc_name, 73382244Sjhb lock->lo_name, file, line); 73482244Sjhb if ((lock->lo_class->lc_flags & LC_SLEEPLOCK) == 0) 73582244Sjhb panic("upgrade of non-sleep lock (%s) %s @ %s:%d", 73682244Sjhb class->lc_name, lock->lo_name, file, line); 73783366Sjulian instance = find_instance(curthread->td_sleeplocks, lock); 73882244Sjhb if (instance == NULL) 73982244Sjhb panic("upgrade of unlocked lock (%s) %s @ %s:%d", 74082244Sjhb class->lc_name, lock->lo_name, file, line); 74182244Sjhb if ((instance->li_flags & LI_EXCLUSIVE) != 0) 74282244Sjhb panic("upgrade of exclusive lock (%s) %s @ %s:%d", 74382244Sjhb class->lc_name, lock->lo_name, file, line); 74482244Sjhb if ((instance->li_flags & LI_RECURSEMASK) != 0) 74582244Sjhb panic("upgrade of recursed lock (%s) %s r=%d @ %s:%d", 74682244Sjhb class->lc_name, lock->lo_name, 74782244Sjhb instance->li_flags & LI_RECURSEMASK, file, line); 74882244Sjhb instance->li_flags |= LI_EXCLUSIVE; 74982244Sjhb} 75082244Sjhb 75182244Sjhbvoid 75282244Sjhbwitness_downgrade(struct lock_object *lock, int flags, const char *file, 75382244Sjhb int line) 75482244Sjhb{ 75582244Sjhb struct lock_instance *instance; 75682244Sjhb struct lock_class *class; 75782244Sjhb 75882284Sjhb KASSERT(!witness_cold, ("%s: witness_cold", __func__)); 75982244Sjhb if (lock->lo_witness == NULL || witness_dead || panicstr != NULL) 76082244Sjhb return; 76182244Sjhb class = lock->lo_class; 76282244Sjhb if ((lock->lo_flags & LO_UPGRADABLE) == 0) 76382244Sjhb panic("downgrade of non-upgradable lock (%s) %s @ %s:%d", 76482244Sjhb class->lc_name, lock->lo_name, file, line); 76582244Sjhb if ((lock->lo_class->lc_flags & LC_SLEEPLOCK) == 0) 76682244Sjhb panic("downgrade of non-sleep lock (%s) %s @ %s:%d", 76782244Sjhb class->lc_name, lock->lo_name, file, line); 76883366Sjulian instance = find_instance(curthread->td_sleeplocks, lock); 76982244Sjhb if (instance == NULL) 77082244Sjhb panic("downgrade of unlocked lock (%s) %s @ %s:%d", 77182244Sjhb class->lc_name, lock->lo_name, file, line); 77282244Sjhb if ((instance->li_flags & LI_EXCLUSIVE) == 0) 77382244Sjhb panic("downgrade of shared lock (%s) %s @ %s:%d", 77482244Sjhb class->lc_name, lock->lo_name, file, line); 77582244Sjhb if ((instance->li_flags & LI_RECURSEMASK) != 0) 77682244Sjhb panic("downgrade of recursed lock (%s) %s r=%d @ %s:%d", 77782244Sjhb class->lc_name, lock->lo_name, 77882244Sjhb instance->li_flags & LI_RECURSEMASK, file, line); 77982244Sjhb instance->li_flags &= ~LI_EXCLUSIVE; 78082244Sjhb} 78182244Sjhb 78282244Sjhbvoid 78374912Sjhbwitness_unlock(struct lock_object *lock, int flags, const char *file, int line) 78465557Sjasone{ 78574912Sjhb struct lock_list_entry **lock_list, *lle; 78676272Sjhb struct lock_instance *instance; 78774912Sjhb struct lock_class *class; 78874016Sjhb struct proc *p; 78983366Sjulian struct thread *td; 79078785Sjhb critical_t s; 79174912Sjhb int i, j; 79265557Sjasone 79374912Sjhb if (witness_cold || witness_dead || lock->lo_witness == NULL || 79480747Sjhb panicstr != NULL) 79571352Sjasone return; 79683366Sjulian td = curthread; 79783366Sjulian p = td->td_proc; 79874912Sjhb class = lock->lo_class; 79976272Sjhb if (class->lc_flags & LC_SLEEPLOCK) 80083366Sjulian lock_list = &td->td_sleeplocks; 80176272Sjhb else 80274912Sjhb lock_list = PCPU_PTR(spinlocks); 80374912Sjhb for (; *lock_list != NULL; lock_list = &(*lock_list)->ll_next) 80476272Sjhb for (i = 0; i < (*lock_list)->ll_count; i++) { 80576272Sjhb instance = &(*lock_list)->ll_children[i]; 80676272Sjhb if (instance->li_lock == lock) { 80776272Sjhb if ((instance->li_flags & LI_EXCLUSIVE) != 0 && 80876272Sjhb (flags & LOP_EXCLUSIVE) == 0) { 80976272Sjhb printf( 81076272Sjhb "shared unlock of (%s) %s @ %s:%d\n", 81176272Sjhb class->lc_name, lock->lo_name, 81276272Sjhb file, line); 81376272Sjhb printf( 81476272Sjhb "while exclusively locked from %s:%d\n", 81576272Sjhb instance->li_file, 81676272Sjhb instance->li_line); 81776272Sjhb panic("excl->ushare"); 81876272Sjhb } 81976272Sjhb if ((instance->li_flags & LI_EXCLUSIVE) == 0 && 82076272Sjhb (flags & LOP_EXCLUSIVE) != 0) { 82176272Sjhb printf( 82276272Sjhb "exclusive unlock of (%s) %s @ %s:%d\n", 82376272Sjhb class->lc_name, lock->lo_name, 82476272Sjhb file, line); 82576272Sjhb printf( 82676272Sjhb "while share locked from %s:%d\n", 82776272Sjhb instance->li_file, 82876272Sjhb instance->li_line); 82976272Sjhb panic("share->uexcl"); 83076272Sjhb } 83176272Sjhb /* If we are recursed, unrecurse. */ 83276272Sjhb if ((instance->li_flags & LI_RECURSEMASK) > 0) { 83378785Sjhb CTR3(KTR_WITNESS, 83478871Sjhb __func__ ": pid %d unrecursed on %s r=%d", 83578785Sjhb curproc->p_pid, 83678785Sjhb instance->li_lock->lo_name, 83778785Sjhb instance->li_flags); 83876272Sjhb instance->li_flags--; 83976272Sjhb goto out; 84076272Sjhb } 84178785Sjhb s = critical_enter(); 84278785Sjhb CTR3(KTR_WITNESS, 84378871Sjhb __func__ ": pid %d removed %s from lle[%d]", 84478785Sjhb curproc->p_pid, instance->li_lock->lo_name, 84578785Sjhb (*lock_list)->ll_count - 1); 84674912Sjhb (*lock_list)->ll_count--; 84774912Sjhb for (j = i; j < (*lock_list)->ll_count; j++) 84874912Sjhb (*lock_list)->ll_children[j] = 84974912Sjhb (*lock_list)->ll_children[j + 1]; 85078785Sjhb critical_exit(s); 85174912Sjhb if ((*lock_list)->ll_count == 0) { 85274912Sjhb lle = *lock_list; 85374912Sjhb *lock_list = lle->ll_next; 85478785Sjhb CTR2(KTR_WITNESS, 85578871Sjhb __func__ ": pid %d removed lle %p", 85678785Sjhb curproc->p_pid, lle); 85774912Sjhb witness_lock_list_free(lle); 85874912Sjhb } 85976272Sjhb goto out; 86074912Sjhb } 86176272Sjhb } 86276272Sjhb panic("lock (%s) %s not locked @ %s:%d", class->lc_name, lock->lo_name, 86376272Sjhb file, line); 86476272Sjhbout: 86576272Sjhb /* 86676272Sjhb * We don't need to protect this PCPU_GET() here against preemption 86776272Sjhb * because if we hold any spinlocks then we are already protected, 86876272Sjhb * and if we don't we will get NULL if we hold no spinlocks even if 86976272Sjhb * we switch CPU's while reading it. 87076272Sjhb */ 87176272Sjhb if (class->lc_flags & LC_SLEEPLOCK) { 87276272Sjhb if ((flags & LOP_NOSWITCH) == 0 && PCPU_GET(spinlocks) != NULL) 87376272Sjhb panic("switchable sleep unlock (%s) %s @ %s:%d", 87476272Sjhb class->lc_name, lock->lo_name, file, line); 87576272Sjhb } 87665557Sjasone} 87765557Sjasone 87874912Sjhb/* 87974912Sjhb * Warn if any held locks are not sleepable. Note that Giant and the lock 88074912Sjhb * passed in are both special cases since they are both released during the 88174912Sjhb * sleep process and aren't actually held while the process is asleep. 88274912Sjhb */ 88365557Sjasoneint 88474912Sjhbwitness_sleep(int check_only, struct lock_object *lock, const char *file, 88574912Sjhb int line) 88665557Sjasone{ 88774912Sjhb struct lock_list_entry **lock_list, *lle; 88876272Sjhb struct lock_instance *lock1; 88965557Sjasone struct proc *p; 89083366Sjulian struct thread *td; 89174912Sjhb critical_t savecrit; 89274912Sjhb int i, n; 89365557Sjasone 89480747Sjhb if (witness_dead || panicstr != NULL) 89574912Sjhb return (0); 89682284Sjhb KASSERT(!witness_cold, ("%s: witness_cold", __func__)); 89774912Sjhb n = 0; 89874912Sjhb /* 89974912Sjhb * Preemption bad because we need PCPU_PTR(spinlocks) to not change. 90074912Sjhb */ 90174912Sjhb savecrit = critical_enter(); 90283366Sjulian td = curthread; 90383366Sjulian p = td->td_proc; 90483366Sjulian lock_list = &td->td_sleeplocks; 90574912Sjhbagain: 90674912Sjhb for (lle = *lock_list; lle != NULL; lle = lle->ll_next) 90774912Sjhb for (i = lle->ll_count - 1; i >= 0; i--) { 90876272Sjhb lock1 = &lle->ll_children[i]; 90976272Sjhb if (lock1->li_lock == lock || 91076272Sjhb lock1->li_lock == &Giant.mtx_object) 91174912Sjhb continue; 91276272Sjhb if ((lock1->li_lock->lo_flags & LO_SLEEPABLE) != 0) { 91378785Sjhb if (check_only == 0) { 91478785Sjhb CTR3(KTR_WITNESS, 91578871Sjhb "pid %d: sleeping with lock (%s) %s held", 91678785Sjhb curproc->p_pid, 91778785Sjhb lock1->li_lock->lo_class->lc_name, 91878785Sjhb lock1->li_lock->lo_name); 91976272Sjhb lock1->li_flags |= LI_SLEPT; 92078785Sjhb } 92176272Sjhb continue; 92276272Sjhb } 92374912Sjhb n++; 92474912Sjhb printf("%s:%d: %s with \"%s\" locked from %s:%d\n", 92574912Sjhb file, line, check_only ? "could sleep" : "sleeping", 92676272Sjhb lock1->li_lock->lo_name, lock1->li_file, 92776272Sjhb lock1->li_line); 92874912Sjhb } 92983366Sjulian if (lock_list == &td->td_sleeplocks) { 93074912Sjhb lock_list = PCPU_PTR(spinlocks); 93174912Sjhb goto again; 93265557Sjasone } 93367676Sjhb#ifdef DDB 93467676Sjhb if (witness_ddb && n) 93575711Sjhb Debugger(__func__); 93667676Sjhb#endif /* DDB */ 93774912Sjhb critical_exit(savecrit); 93865557Sjasone return (n); 93965557Sjasone} 94065557Sjasone 94165856Sjhbstatic struct witness * 94274912Sjhbenroll(const char *description, struct lock_class *lock_class) 94365557Sjasone{ 94474912Sjhb struct witness *w; 94565557Sjasone 94680747Sjhb if (!witness_watch || witness_dead || panicstr != NULL) 94765557Sjasone return (NULL); 94874912Sjhb if ((lock_class->lc_flags & LC_SPINLOCK) && witness_skipspin) 94965557Sjasone return (NULL); 95074912Sjhb mtx_lock_spin(&w_mtx); 95174912Sjhb STAILQ_FOREACH(w, &w_all, w_list) { 95274912Sjhb if (strcmp(description, w->w_name) == 0) { 95375362Sjhb w->w_refcount++; 95474912Sjhb mtx_unlock_spin(&w_mtx); 95574912Sjhb if (lock_class != w->w_class) 95674912Sjhb panic( 95774912Sjhb "lock (%s) %s does not match earlier (%s) lock", 95874912Sjhb description, lock_class->lc_name, 95974912Sjhb w->w_class->lc_name); 96065557Sjasone return (w); 96165557Sjasone } 96265557Sjasone } 96374912Sjhb /* 96474912Sjhb * This isn't quite right, as witness_cold is still 0 while we 96574912Sjhb * enroll all the locks initialized before witness_initialize(). 96674912Sjhb */ 96775364Sbp if ((lock_class->lc_flags & LC_SPINLOCK) && !witness_cold) { 96875364Sbp mtx_unlock_spin(&w_mtx); 96974912Sjhb panic("spin lock %s not in order list", description); 97075364Sbp } 97165557Sjasone if ((w = witness_get()) == NULL) 97265557Sjasone return (NULL); 97374912Sjhb w->w_name = description; 97474912Sjhb w->w_class = lock_class; 97575362Sjhb w->w_refcount = 1; 97674912Sjhb STAILQ_INSERT_HEAD(&w_all, w, w_list); 97774912Sjhb if (lock_class->lc_flags & LC_SPINLOCK) 97874912Sjhb STAILQ_INSERT_HEAD(&w_spin, w, w_typelist); 97974912Sjhb else if (lock_class->lc_flags & LC_SLEEPLOCK) 98074912Sjhb STAILQ_INSERT_HEAD(&w_sleep, w, w_typelist); 98175364Sbp else { 98275364Sbp mtx_unlock_spin(&w_mtx); 98374912Sjhb panic("lock class %s is not sleep or spin", 98474912Sjhb lock_class->lc_name); 98575364Sbp } 98674912Sjhb mtx_unlock_spin(&w_mtx); 98765557Sjasone return (w); 98865557Sjasone} 98965557Sjasone 99065557Sjasonestatic int 99165856Sjhbitismychild(struct witness *parent, struct witness *child) 99265557Sjasone{ 99365557Sjasone static int recursed; 99474912Sjhb struct witness_child_list_entry **wcl; 99574912Sjhb struct witness_list *list; 99665557Sjasone 99774912Sjhb MPASS(child != NULL && parent != NULL); 99874912Sjhb if ((parent->w_class->lc_flags & (LC_SLEEPLOCK | LC_SPINLOCK)) != 99974912Sjhb (child->w_class->lc_flags & (LC_SLEEPLOCK | LC_SPINLOCK))) 100074912Sjhb panic( 100174912Sjhb "%s: parent (%s) and child (%s) are not the same lock type", 100274912Sjhb __func__, parent->w_class->lc_name, 100374912Sjhb child->w_class->lc_name); 100474912Sjhb 100565557Sjasone /* 100665557Sjasone * Insert "child" after "parent" 100765557Sjasone */ 100874912Sjhb wcl = &parent->w_children; 100974912Sjhb while (*wcl != NULL && (*wcl)->wcl_count == WITNESS_NCHILDREN) 101074912Sjhb wcl = &(*wcl)->wcl_next; 101174912Sjhb if (*wcl == NULL) { 101274912Sjhb *wcl = witness_child_get(); 101374912Sjhb if (*wcl == NULL) 101465557Sjasone return (1); 101565557Sjasone } 101674912Sjhb (*wcl)->wcl_children[(*wcl)->wcl_count++] = child; 101774912Sjhb 101865557Sjasone /* 101974912Sjhb * Now prune whole tree. We look for cases where a lock is now 102074912Sjhb * both a descendant and a direct child of a given lock. In that 102174912Sjhb * case, we want to remove the direct child link from the tree. 102265557Sjasone */ 102365557Sjasone if (recursed) 102465557Sjasone return (0); 102565557Sjasone recursed = 1; 102674912Sjhb if (parent->w_class->lc_flags & LC_SLEEPLOCK) 102774912Sjhb list = &w_sleep; 102874912Sjhb else 102974912Sjhb list = &w_spin; 103074912Sjhb STAILQ_FOREACH(child, list, w_typelist) { 103174912Sjhb STAILQ_FOREACH(parent, list, w_typelist) { 103265557Sjasone if (!isitmychild(parent, child)) 103365557Sjasone continue; 103465557Sjasone removechild(parent, child); 103565557Sjasone if (isitmydescendant(parent, child)) 103665557Sjasone continue; 103765557Sjasone itismychild(parent, child); 103865557Sjasone } 103965557Sjasone } 104065557Sjasone recursed = 0; 104165557Sjasone witness_levelall(); 104265557Sjasone return (0); 104365557Sjasone} 104465557Sjasone 104565557Sjasonestatic void 104665856Sjhbremovechild(struct witness *parent, struct witness *child) 104765557Sjasone{ 104874912Sjhb struct witness_child_list_entry **wcl, *wcl1; 104965557Sjasone int i; 105065557Sjasone 105174912Sjhb for (wcl = &parent->w_children; *wcl != NULL; wcl = &(*wcl)->wcl_next) 105274912Sjhb for (i = 0; i < (*wcl)->wcl_count; i++) 105374912Sjhb if ((*wcl)->wcl_children[i] == child) 105465557Sjasone goto found; 105565557Sjasone return; 105665557Sjasonefound: 105774912Sjhb (*wcl)->wcl_count--; 105874912Sjhb if ((*wcl)->wcl_count > i) 105974912Sjhb (*wcl)->wcl_children[i] = 106074912Sjhb (*wcl)->wcl_children[(*wcl)->wcl_count]; 106174912Sjhb MPASS((*wcl)->wcl_children[i] != NULL); 106274912Sjhb if ((*wcl)->wcl_count != 0) 106365557Sjasone return; 106474912Sjhb wcl1 = *wcl; 106574912Sjhb *wcl = wcl1->wcl_next; 106674912Sjhb witness_child_free(wcl1); 106765557Sjasone} 106865557Sjasone 106965557Sjasonestatic int 107065856Sjhbisitmychild(struct witness *parent, struct witness *child) 107165557Sjasone{ 107274912Sjhb struct witness_child_list_entry *wcl; 107365557Sjasone int i; 107465557Sjasone 107574912Sjhb for (wcl = parent->w_children; wcl != NULL; wcl = wcl->wcl_next) { 107674912Sjhb for (i = 0; i < wcl->wcl_count; i++) { 107774912Sjhb if (wcl->wcl_children[i] == child) 107865557Sjasone return (1); 107965557Sjasone } 108065557Sjasone } 108165557Sjasone return (0); 108265557Sjasone} 108365557Sjasone 108465557Sjasonestatic int 108565856Sjhbisitmydescendant(struct witness *parent, struct witness *child) 108665557Sjasone{ 108774912Sjhb struct witness_child_list_entry *wcl; 108874912Sjhb int i, j; 108965557Sjasone 109074912Sjhb if (isitmychild(parent, child)) 109174912Sjhb return (1); 109274912Sjhb j = 0; 109374912Sjhb for (wcl = parent->w_children; wcl != NULL; wcl = wcl->wcl_next) { 109467352Sjhb MPASS(j < 1000); 109574912Sjhb for (i = 0; i < wcl->wcl_count; i++) { 109674912Sjhb if (isitmydescendant(wcl->wcl_children[i], child)) 109765557Sjasone return (1); 109865557Sjasone } 109974912Sjhb j++; 110065557Sjasone } 110165557Sjasone return (0); 110265557Sjasone} 110365557Sjasone 110465557Sjasonevoid 110565557Sjasonewitness_levelall (void) 110665557Sjasone{ 110774912Sjhb struct witness_list *list; 110865856Sjhb struct witness *w, *w1; 110965557Sjasone 111074912Sjhb /* 111174912Sjhb * First clear all levels. 111274912Sjhb */ 111374912Sjhb STAILQ_FOREACH(w, &w_all, w_list) { 111474912Sjhb w->w_level = 0; 111574912Sjhb } 111674912Sjhb 111774912Sjhb /* 111874912Sjhb * Look for locks with no parent and level all their descendants. 111974912Sjhb */ 112074912Sjhb STAILQ_FOREACH(w, &w_all, w_list) { 112174912Sjhb /* 112274912Sjhb * This is just an optimization, technically we could get 112374912Sjhb * away just walking the all list each time. 112474912Sjhb */ 112574912Sjhb if (w->w_class->lc_flags & LC_SLEEPLOCK) 112674912Sjhb list = &w_sleep; 112774912Sjhb else 112874912Sjhb list = &w_spin; 112974912Sjhb STAILQ_FOREACH(w1, list, w_typelist) { 113065557Sjasone if (isitmychild(w1, w)) 113174912Sjhb goto skip; 113265557Sjasone } 113365557Sjasone witness_leveldescendents(w, 0); 113474912Sjhb skip: 113565557Sjasone } 113665557Sjasone} 113765557Sjasone 113865557Sjasonestatic void 113965856Sjhbwitness_leveldescendents(struct witness *parent, int level) 114065557Sjasone{ 114174912Sjhb struct witness_child_list_entry *wcl; 114265557Sjasone int i; 114365557Sjasone 114465557Sjasone if (parent->w_level < level) 114565557Sjasone parent->w_level = level; 114665557Sjasone level++; 114774912Sjhb for (wcl = parent->w_children; wcl != NULL; wcl = wcl->wcl_next) 114874912Sjhb for (i = 0; i < wcl->wcl_count; i++) 114974912Sjhb witness_leveldescendents(wcl->wcl_children[i], level); 115065557Sjasone} 115165557Sjasone 115265557Sjasonestatic void 115365856Sjhbwitness_displaydescendants(void(*prnt)(const char *fmt, ...), 115465856Sjhb struct witness *parent) 115565557Sjasone{ 115674912Sjhb struct witness_child_list_entry *wcl; 115774912Sjhb int i, level; 115865557Sjasone 115974912Sjhb level = parent->w_level; 116074912Sjhb prnt("%-2d", level); 116165557Sjasone for (i = 0; i < level; i++) 116265557Sjasone prnt(" "); 116374912Sjhb prnt("%s", parent->w_name); 116472224Sjhb if (parent->w_file != NULL) 116572224Sjhb prnt(" -- last acquired @ %s:%d\n", parent->w_file, 116672224Sjhb parent->w_line); 116774912Sjhb for (wcl = parent->w_children; wcl != NULL; wcl = wcl->wcl_next) 116874912Sjhb for (i = 0; i < wcl->wcl_count; i++) 116974912Sjhb witness_displaydescendants(prnt, 117074912Sjhb wcl->wcl_children[i]); 117174912Sjhb} 117265557Sjasone 117365557Sjasonestatic int 117465856Sjhbdup_ok(struct witness *w) 117565557Sjasone{ 117674912Sjhb const char **dup; 117765557Sjasone 117874912Sjhb for (dup = dup_list; *dup != NULL; dup++) 117974912Sjhb if (strcmp(w->w_name, *dup) == 0) 118065557Sjasone return (1); 118165557Sjasone return (0); 118265557Sjasone} 118365557Sjasone 118465557Sjasonestatic int 118565856Sjhbblessed(struct witness *w1, struct witness *w2) 118665557Sjasone{ 118765557Sjasone int i; 118865856Sjhb struct witness_blessed *b; 118965557Sjasone 119065557Sjasone for (i = 0; i < blessed_count; i++) { 119165557Sjasone b = &blessed_list[i]; 119274912Sjhb if (strcmp(w1->w_name, b->b_lock1) == 0) { 119374912Sjhb if (strcmp(w2->w_name, b->b_lock2) == 0) 119465557Sjasone return (1); 119565557Sjasone continue; 119665557Sjasone } 119774912Sjhb if (strcmp(w1->w_name, b->b_lock2) == 0) 119874912Sjhb if (strcmp(w2->w_name, b->b_lock1) == 0) 119965557Sjasone return (1); 120065557Sjasone } 120165557Sjasone return (0); 120265557Sjasone} 120365557Sjasone 120465856Sjhbstatic struct witness * 120574912Sjhbwitness_get(void) 120665557Sjasone{ 120765856Sjhb struct witness *w; 120865557Sjasone 120976481Sjhb if (witness_dead) { 121076481Sjhb mtx_unlock_spin(&w_mtx); 121176481Sjhb return (NULL); 121276481Sjhb } 121374912Sjhb if (STAILQ_EMPTY(&w_free)) { 121465557Sjasone witness_dead = 1; 121574912Sjhb mtx_unlock_spin(&w_mtx); 121674912Sjhb printf("%s: witness exhausted\n", __func__); 121765557Sjasone return (NULL); 121865557Sjasone } 121974912Sjhb w = STAILQ_FIRST(&w_free); 122074912Sjhb STAILQ_REMOVE_HEAD(&w_free, w_list); 122165856Sjhb bzero(w, sizeof(*w)); 122265557Sjasone return (w); 122365557Sjasone} 122465557Sjasone 122565557Sjasonestatic void 122665856Sjhbwitness_free(struct witness *w) 122765557Sjasone{ 122874912Sjhb 122974912Sjhb STAILQ_INSERT_HEAD(&w_free, w, w_list); 123065557Sjasone} 123165557Sjasone 123274912Sjhbstatic struct witness_child_list_entry * 123374912Sjhbwitness_child_get(void) 123465557Sjasone{ 123574912Sjhb struct witness_child_list_entry *wcl; 123665557Sjasone 123776481Sjhb if (witness_dead) { 123876481Sjhb mtx_unlock_spin(&w_mtx); 123976481Sjhb return (NULL); 124076481Sjhb } 124174912Sjhb wcl = w_child_free; 124274912Sjhb if (wcl == NULL) { 124374912Sjhb witness_dead = 1; 124474912Sjhb mtx_unlock_spin(&w_mtx); 124574912Sjhb printf("%s: witness exhausted\n", __func__); 124674912Sjhb return (NULL); 124765557Sjasone } 124874912Sjhb w_child_free = wcl->wcl_next; 124974912Sjhb bzero(wcl, sizeof(*wcl)); 125074912Sjhb return (wcl); 125174912Sjhb} 125269881Sjake 125374912Sjhbstatic void 125474912Sjhbwitness_child_free(struct witness_child_list_entry *wcl) 125574912Sjhb{ 125674912Sjhb 125774912Sjhb wcl->wcl_next = w_child_free; 125874912Sjhb w_child_free = wcl; 125965557Sjasone} 126065557Sjasone 126174912Sjhbstatic struct lock_list_entry * 126274912Sjhbwitness_lock_list_get(void) 126374912Sjhb{ 126474912Sjhb struct lock_list_entry *lle; 126571709Sjhb 126676481Sjhb if (witness_dead) 126776481Sjhb return (NULL); 126874912Sjhb mtx_lock_spin(&w_mtx); 126974912Sjhb lle = w_lock_list_free; 127074912Sjhb if (lle == NULL) { 127174912Sjhb witness_dead = 1; 127274912Sjhb mtx_unlock_spin(&w_mtx); 127374912Sjhb printf("%s: witness exhausted\n", __func__); 127474912Sjhb return (NULL); 127574912Sjhb } 127674912Sjhb w_lock_list_free = lle->ll_next; 127774912Sjhb mtx_unlock_spin(&w_mtx); 127874912Sjhb bzero(lle, sizeof(*lle)); 127974912Sjhb return (lle); 128074912Sjhb} 128174912Sjhb 128274912Sjhbstatic void 128374912Sjhbwitness_lock_list_free(struct lock_list_entry *lle) 128471709Sjhb{ 128571709Sjhb 128674912Sjhb mtx_lock_spin(&w_mtx); 128774912Sjhb lle->ll_next = w_lock_list_free; 128874912Sjhb w_lock_list_free = lle; 128974912Sjhb mtx_unlock_spin(&w_mtx); 129071709Sjhb} 129171709Sjhb 129276272Sjhbstatic struct lock_instance * 129376272Sjhbfind_instance(struct lock_list_entry *lock_list, struct lock_object *lock) 129476272Sjhb{ 129576272Sjhb struct lock_list_entry *lle; 129676272Sjhb struct lock_instance *instance; 129776272Sjhb int i; 129876272Sjhb 129976272Sjhb for (lle = lock_list; lle != NULL; lle = lle->ll_next) 130076272Sjhb for (i = lle->ll_count - 1; i >= 0; i--) { 130176272Sjhb instance = &lle->ll_children[i]; 130276272Sjhb if (instance->li_lock == lock) 130376272Sjhb return (instance); 130476272Sjhb } 130576272Sjhb return (NULL); 130676272Sjhb} 130776272Sjhb 130874912Sjhbint 130975273Sjhbwitness_list_locks(struct lock_list_entry **lock_list) 131072224Sjhb{ 131175273Sjhb struct lock_list_entry *lle; 131276272Sjhb struct lock_instance *instance; 131374912Sjhb struct lock_object *lock; 131474912Sjhb int i, nheld; 131572224Sjhb 131674912Sjhb nheld = 0; 131774912Sjhb for (lle = *lock_list; lle != NULL; lle = lle->ll_next) 131874912Sjhb for (i = lle->ll_count - 1; i >= 0; i--) { 131976272Sjhb instance = &lle->ll_children[i]; 132076272Sjhb lock = instance->li_lock; 132176272Sjhb printf("%s (%s) %s (%p) locked @ %s:%d\n", 132276272Sjhb (instance->li_flags & LI_EXCLUSIVE) != 0 ? 132376272Sjhb "exclusive" : "shared", 132474912Sjhb lock->lo_class->lc_name, lock->lo_name, lock, 132576272Sjhb instance->li_file, instance->li_line); 132674912Sjhb nheld++; 132774912Sjhb } 132875273Sjhb return (nheld); 132975273Sjhb} 133075273Sjhb 133175273Sjhb/* 133283366Sjulian * Calling this on td != curthread is bad unless we are in ddb. 133375273Sjhb */ 133475273Sjhbint 133583366Sjulianwitness_list(struct thread *td) 133675273Sjhb{ 133775273Sjhb critical_t savecrit; 133875273Sjhb int nheld; 133975273Sjhb 134081489Sjhb KASSERT(!witness_cold, ("%s: witness_cold", __func__)); 134181489Sjhb#ifdef DDB 134283366Sjulian KASSERT(td == curthread || db_active, 134383366Sjulian ("%s: td != curthread and we aren't in the debugger", __func__)); 134476481Sjhb if (!db_active && witness_dead) 134576481Sjhb return (0); 134681489Sjhb#else 134783366Sjulian KASSERT(td == curthread, ("%s: p != curthread", __func__)); 134881489Sjhb if (witness_dead) 134981489Sjhb return (0); 135081489Sjhb#endif 135183366Sjulian nheld = witness_list_locks(&td->td_sleeplocks); 135275273Sjhb 135374912Sjhb /* 135483366Sjulian * We only handle spinlocks if td == curthread. This is somewhat broken 135574912Sjhb * if p is currently executing on some other CPU and holds spin locks 135675273Sjhb * as we won't display those locks. If we had a MI way of getting 135775273Sjhb * the per-cpu data for a given cpu then we could use p->p_oncpu to 135875273Sjhb * get the list of spinlocks for this process and "fix" this. 135974912Sjhb */ 136083366Sjulian if (td == curthread) { 136175273Sjhb /* 136275273Sjhb * Preemption bad because we need PCPU_PTR(spinlocks) to not 136375273Sjhb * change. 136475273Sjhb */ 136575273Sjhb savecrit = critical_enter(); 136675273Sjhb nheld += witness_list_locks(PCPU_PTR(spinlocks)); 136775273Sjhb critical_exit(savecrit); 136874912Sjhb } 136974912Sjhb return (nheld); 137072224Sjhb} 137171709Sjhb 137265557Sjasonevoid 137374912Sjhbwitness_save(struct lock_object *lock, const char **filep, int *linep) 137465557Sjasone{ 137576272Sjhb struct lock_instance *instance; 137671320Sjasone 137782284Sjhb KASSERT(!witness_cold, ("%s: witness_cold", __func__)); 137880747Sjhb if (lock->lo_witness == NULL || witness_dead || panicstr != NULL) 137971352Sjasone return; 138082243Sjhb if ((lock->lo_class->lc_flags & LC_SLEEPLOCK) == 0) 138182243Sjhb panic("%s: lock (%s) %s is not a sleep lock", __func__, 138282243Sjhb lock->lo_class->lc_name, lock->lo_name); 138383366Sjulian instance = find_instance(curthread->td_sleeplocks, lock); 138482243Sjhb if (instance == NULL) 138582243Sjhb panic("%s: lock (%s) %s not locked", __func__, 138682243Sjhb lock->lo_class->lc_name, lock->lo_name); 138776272Sjhb *filep = instance->li_file; 138876272Sjhb *linep = instance->li_line; 138965557Sjasone} 139065557Sjasone 139165557Sjasonevoid 139274912Sjhbwitness_restore(struct lock_object *lock, const char *file, int line) 139365557Sjasone{ 139476272Sjhb struct lock_instance *instance; 139571320Sjasone 139682284Sjhb KASSERT(!witness_cold, ("%s: witness_cold", __func__)); 139780747Sjhb if (lock->lo_witness == NULL || witness_dead || panicstr != NULL) 139871352Sjasone return; 139982243Sjhb if ((lock->lo_class->lc_flags & LC_SLEEPLOCK) == 0) 140082243Sjhb panic("%s: lock (%s) %s is not a sleep lock", __func__, 140182243Sjhb lock->lo_class->lc_name, lock->lo_name); 140283366Sjulian instance = find_instance(curthread->td_sleeplocks, lock); 140382243Sjhb if (instance == NULL) 140482243Sjhb panic("%s: lock (%s) %s not locked", __func__, 140582243Sjhb lock->lo_class->lc_name, lock->lo_name); 140674912Sjhb lock->lo_witness->w_file = file; 140774912Sjhb lock->lo_witness->w_line = line; 140876272Sjhb instance->li_file = file; 140976272Sjhb instance->li_line = line; 141065557Sjasone} 141165557Sjasone 141278871Sjhbvoid 141378871Sjhbwitness_assert(struct lock_object *lock, int flags, const char *file, int line) 141478871Sjhb{ 141578871Sjhb#ifdef INVARIANT_SUPPORT 141678871Sjhb struct lock_instance *instance; 141778871Sjhb 141880747Sjhb if (lock->lo_witness == NULL || witness_dead || panicstr != NULL) 141978941Sjhb return; 142078871Sjhb if ((lock->lo_class->lc_flags & LC_SLEEPLOCK) != 0) 142183366Sjulian instance = find_instance(curthread->td_sleeplocks, lock); 142278871Sjhb else if ((lock->lo_class->lc_flags & LC_SPINLOCK) != 0) 142378871Sjhb instance = find_instance(PCPU_GET(spinlocks), lock); 142478871Sjhb else 142578871Sjhb panic("Lock (%s) %s is not sleep or spin!", 142678871Sjhb lock->lo_class->lc_name, lock->lo_name); 142778871Sjhb switch (flags) { 142878871Sjhb case LA_UNLOCKED: 142978871Sjhb if (instance != NULL) 143078871Sjhb panic("Lock (%s) %s locked @ %s:%d.", 143178871Sjhb lock->lo_class->lc_name, lock->lo_name, file, line); 143278871Sjhb break; 143378871Sjhb case LA_LOCKED: 143478871Sjhb case LA_LOCKED | LA_RECURSED: 143578871Sjhb case LA_LOCKED | LA_NOTRECURSED: 143678871Sjhb case LA_SLOCKED: 143778871Sjhb case LA_SLOCKED | LA_RECURSED: 143878871Sjhb case LA_SLOCKED | LA_NOTRECURSED: 143978871Sjhb case LA_XLOCKED: 144078871Sjhb case LA_XLOCKED | LA_RECURSED: 144178871Sjhb case LA_XLOCKED | LA_NOTRECURSED: 144278871Sjhb if (instance == NULL) 144378871Sjhb panic("Lock (%s) %s not locked @ %s:%d.", 144478871Sjhb lock->lo_class->lc_name, lock->lo_name, file, line); 144578871Sjhb if ((flags & LA_XLOCKED) != 0 && 144678871Sjhb (instance->li_flags & LI_EXCLUSIVE) == 0) 144778871Sjhb panic("Lock (%s) %s not exclusively locked @ %s:%d.", 144878871Sjhb lock->lo_class->lc_name, lock->lo_name, file, line); 144978871Sjhb if ((flags & LA_SLOCKED) != 0 && 145078871Sjhb (instance->li_flags & LI_EXCLUSIVE) != 0) 145178871Sjhb panic("Lock (%s) %s exclusively locked @ %s:%d.", 145278871Sjhb lock->lo_class->lc_name, lock->lo_name, file, line); 145378871Sjhb if ((flags & LA_RECURSED) != 0 && 145478871Sjhb (instance->li_flags & LI_RECURSEMASK) == 0) 145578871Sjhb panic("Lock (%s) %s not recursed @ %s:%d.", 145678871Sjhb lock->lo_class->lc_name, lock->lo_name, file, line); 145778871Sjhb if ((flags & LA_NOTRECURSED) != 0 && 145878871Sjhb (instance->li_flags & LI_RECURSEMASK) != 0) 145978871Sjhb panic("Lock (%s) %s recursed @ %s:%d.", 146078871Sjhb lock->lo_class->lc_name, lock->lo_name, file, line); 146178871Sjhb break; 146278871Sjhb default: 146378871Sjhb panic("Invalid lock assertion at %s:%d.", file, line); 146478871Sjhb 146578871Sjhb } 146678871Sjhb#endif /* INVARIANT_SUPPORT */ 146778871Sjhb} 146878871Sjhb 146974912Sjhb#ifdef DDB 147074912Sjhb 147174930SjhbDB_SHOW_COMMAND(locks, db_witness_list) 147274912Sjhb{ 147383366Sjulian struct thread *td; 147483366Sjulian pid_t pid; 147575273Sjhb struct proc *p; 147674912Sjhb 147775273Sjhb if (have_addr) { 147875273Sjhb pid = (addr % 16) + ((addr >> 4) % 16) * 10 + 147975273Sjhb ((addr >> 8) % 16) * 100 + ((addr >> 12) % 16) * 1000 + 148075273Sjhb ((addr >> 16) % 16) * 10000; 148175273Sjhb /* sx_slock(&allproc_lock); */ 148283366Sjulian FOREACH_PROC_IN_SYSTEM(p) { 148375273Sjhb if (p->p_pid == pid) 148475273Sjhb break; 148575273Sjhb } 148675273Sjhb /* sx_sunlock(&allproc_lock); */ 148775273Sjhb if (p == NULL) { 148875273Sjhb db_printf("pid %d not found\n", pid); 148975273Sjhb return; 149075273Sjhb } 149183366Sjulian td = &p->p_thread; /* XXXKSE */ 149283366Sjulian } else { 149383366Sjulian td = curthread; 149483366Sjulian } 149583366Sjulian witness_list(td); 149674912Sjhb} 149774912Sjhb 149874912SjhbDB_SHOW_COMMAND(witness, db_witness_display) 149974912Sjhb{ 150074912Sjhb 150174912Sjhb witness_display(db_printf); 150274912Sjhb} 150374912Sjhb#endif 1504