116b99dcbc
- Introduce lock classes and lock objects. Each lock class specifies a
name and set of flags (or properties) shared by all locks of a given
type. Currently there are three lock classes: spin mutexes, sleep
mutexes, and sx locks. A lock object specifies properties of an
additional lock along with a lock name and all of the extra stuff needed
to make witness work with a given lock. This abstract lock stuff is
defined in sys/lock.h. The lockmgr constants, types, and prototypes have
been moved to sys/lockmgr.h. For temporary backwards compatability,
sys/lock.h includes sys/lockmgr.h.
- Replace proc->p_spinlocks with a per-CPU list, PCPU(spinlocks), of spin
locks held. By making this per-cpu, we do not have to jump through
magic hoops to deal with sched_lock changing ownership during context
switches.
- Replace proc->p_heldmtx, formerly a list of held sleep mutexes, with
proc->p_sleeplocks, which is a list of held sleep locks including sleep
mutexes and sx locks.
- Add helper macros for logging lock events via the KTR_LOCK KTR logging
level so that the log messages are consistent.
- Add some new flags that can be passed to mtx_init():
- MTX_NOWITNESS - specifies that this lock should be ignored by witness.
This is used for the mutex that blocks a sx lock for example.
- MTX_QUIET - this is not new, but you can pass this to mtx_init() now
and no events will be logged for this lock, so that one doesn't have
to change all the individual mtx_lock/unlock() operations.
- All lock objects maintain an initialized flag. Use this flag to export
a mtx_initialized() macro that can be safely called from drivers. Also,
we on longer walk the all_mtx list if MUTEX_DEBUG is defined as witness
performs the corresponding checks using the initialized flag.
- The lock order reversal messages have been improved to output slightly
more accurate file and line numbers.
81 lines
3.0 KiB
C
81 lines
3.0 KiB
C
/*-
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* Copyright (c) 1999 Luoqi Chen <luoqi@freebsd.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _MACHINE_GLOBALDATA_H_
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#define _MACHINE_GLOBALDATA_H_
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#ifdef _KERNEL
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#include <sys/queue.h>
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/*
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* This structure maps out the global data that needs to be kept on a
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* per-cpu basis. genassym uses this to generate offsets for the assembler
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* code, which also provides external symbols so that C can get at them as
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* though they were really globals. This structure is pointed to by
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* the per-cpu system value (see alpha_pal_rdval() and alpha_pal_wrval()).
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* Inside the kernel, the globally reserved register t7 is used to
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* point at the globaldata structure.
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*/
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struct globaldata {
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struct alpha_pcb gd_idlepcb; /* pcb for idling */
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struct proc *gd_curproc; /* current process */
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struct proc *gd_idleproc; /* idle process */
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struct proc *gd_fpcurproc; /* fp state owner */
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struct pcb *gd_curpcb; /* current pcb */
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struct timeval gd_switchtime;
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int gd_switchticks;
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u_int gd_cpuid; /* this cpu number */
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u_int gd_other_cpus; /* all other cpus */
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u_int64_t gd_idlepcbphys; /* pa of gd_idlepcb */
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u_int64_t gd_pending_ipis; /* pending IPI events */
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u_int32_t gd_next_asn; /* next ASN to allocate */
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u_int32_t gd_current_asngen; /* ASN rollover check */
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SLIST_ENTRY(globaldata) gd_allcpu;
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struct lock_list_entry *gd_spinlocks;
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#ifdef KTR_PERCPU
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volatile int gd_ktr_idx; /* Index into trace table */
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char *gd_ktr_buf;
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char gd_ktr_buf_data[0];
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#endif
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};
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SLIST_HEAD(cpuhead, globaldata);
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extern struct cpuhead cpuhead;
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void globaldata_init(struct globaldata *pcpu, int cpuid, size_t sz);
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struct globaldata *globaldata_find(int cpuid);
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#ifdef SMP
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void globaldata_register(struct globaldata *pcpu);
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#endif
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#endif /* _KERNEL */
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#endif /* !_MACHINE_GLOBALDATA_H_ */
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