569 lines
16 KiB
C
569 lines
16 KiB
C
/*-
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* Copyright (c) 1997 Berkeley Software Design, Inc. 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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* 3. Berkeley Software Design Inc's name may not be used to endorse or
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* promote products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY BERKELEY SOFTWARE DESIGN INC ``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 BERKELEY SOFTWARE DESIGN INC 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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* from BSDI $Id: mutex.h,v 2.7.2.35 2000/04/27 03:10:26 cp Exp $
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* $FreeBSD$
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*/
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#ifndef _MACHINE_MUTEX_H_
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#define _MACHINE_MUTEX_H_
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#ifndef LOCORE
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#include <sys/queue.h>
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#ifdef _KERNEL
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#include <sys/ktr.h>
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#include <sys/proc.h> /* Needed for curproc. */
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#include <machine/atomic.h>
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#include <machine/cpufunc.h>
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#include <machine/globaldata.h>
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#include <machine/globals.h>
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/*
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* If kern_mutex.c is being built, compile non-inlined versions of various
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* functions so that kernel modules can use them.
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*/
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#ifndef _KERN_MUTEX_C_
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#define _MTX_INLINE static __inline
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#else
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#define _MTX_INLINE
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#endif
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/*
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* Mutex flags
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*
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* Types
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*/
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#define MTX_DEF 0x1 /* Default (spin/sleep) */
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#define MTX_SPIN 0x2 /* Spin only lock */
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/* Options */
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#define MTX_RLIKELY 0x4 /* (opt) Recursion likely */
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#define MTX_NORECURSE 0x8 /* No recursion possible */
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#define MTX_NOSPIN 0x10 /* Don't spin before sleeping */
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#define MTX_NOSWITCH 0x20 /* Do not switch on release */
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#define MTX_FIRST 0x40 /* First spin lock holder */
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#define MTX_TOPHALF 0x80 /* Interrupts not disabled on spin */
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/* options that should be passed on to mtx_enter_hard, mtx_exit_hard */
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#define MTX_HARDOPTS (MTX_DEF | MTX_SPIN | MTX_FIRST | MTX_TOPHALF | MTX_NOSWITCH)
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/* Flags/value used in mtx_lock */
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#define MTX_RECURSE 0x01 /* (non-spin) lock held recursively */
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#define MTX_CONTESTED 0x02 /* (non-spin) lock contested */
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#define MTX_FLAGMASK ~(MTX_RECURSE | MTX_CONTESTED)
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#define MTX_UNOWNED 0x8 /* Cookie for free mutex */
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#endif /* _KERNEL */
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/*
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* Sleep/spin mutex
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*/
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struct mtx {
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volatile u_int64_t mtx_lock; /* lock owner/gate/flags */
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volatile u_int32_t mtx_recurse; /* number of recursive holds */
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u_int32_t mtx_savepsr; /* saved psr (for spin locks) */
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char *mtx_description;
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TAILQ_HEAD(, proc) mtx_blocked;
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LIST_ENTRY(mtx) mtx_contested;
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struct mtx *mtx_next; /* all locks in system */
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struct mtx *mtx_prev;
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#ifdef SMP_DEBUG
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/* If you add anything here, adjust the mtxf_t definition below */
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struct witness *mtx_witness;
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LIST_ENTRY(mtx) mtx_held;
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const char *mtx_file;
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int mtx_line;
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#endif /* SMP_DEBUG */
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};
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/*
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* Filler for structs which need to remain the same size
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* whether or not SMP_DEBUG is turned on.
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*/
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typedef struct mtxf {
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#ifdef SMP_DEBUG
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char mtxf_data[0];
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#else
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char mtxf_data[4*sizeof(void *) + sizeof(int)];
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#endif
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} mtxf_t;
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#define mp_fixme(string)
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#ifdef _KERNEL
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/* Misc */
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#define CURTHD ((u_int64_t)CURPROC) /* Current thread ID */
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/* Prototypes */
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void mtx_init(struct mtx *m, char *description, int flag);
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void mtx_enter_hard(struct mtx *, int type, int psr);
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void mtx_exit_hard(struct mtx *, int type);
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void mtx_destroy(struct mtx *m);
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/*
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* Wrap the following functions with cpp macros so that filenames and line
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* numbers are embedded in the code correctly.
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*/
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#if (defined(KLD_MODULE) || defined(_KERN_MUTEX_C_))
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void _mtx_enter(struct mtx *mtxp, int type, const char *file, int line);
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int _mtx_try_enter(struct mtx *mtxp, int type, const char *file, int line);
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void _mtx_exit(struct mtx *mtxp, int type, const char *file, int line);
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#endif
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#define mtx_enter(mtxp, type) \
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_mtx_enter((mtxp), (type), __FILE__, __LINE__)
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#define mtx_try_enter(mtxp, type) \
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_mtx_try_enter((mtxp), (type), __FILE__, __LINE__)
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#define mtx_exit(mtxp, type) \
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_mtx_exit((mtxp), (type), __FILE__, __LINE__)
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/* Global locks */
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extern struct mtx sched_lock;
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extern struct mtx Giant;
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/*
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* Used to replace return with an exit Giant and return.
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*/
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#define EGAR(a) \
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do { \
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mtx_exit(&Giant, MTX_DEF); \
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return (a); \
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} while (0)
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#define VEGAR \
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do { \
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mtx_exit(&Giant, MTX_DEF); \
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return; \
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} while (0)
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#define DROP_GIANT() \
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do { \
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int _giantcnt; \
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WITNESS_SAVE_DECL(Giant); \
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\
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WITNESS_SAVE(&Giant, Giant); \
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for (_giantcnt = 0; mtx_owned(&Giant); _giantcnt++) \
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mtx_exit(&Giant, MTX_DEF)
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#define PICKUP_GIANT() \
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mtx_assert(&Giant, MA_NOTOWNED); \
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while (_giantcnt--) \
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mtx_enter(&Giant, MTX_DEF); \
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WITNESS_RESTORE(&Giant, Giant); \
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} while (0)
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#define PARTIAL_PICKUP_GIANT() \
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mtx_assert(&Giant, MA_NOTOWNED); \
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while (_giantcnt--) \
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mtx_enter(&Giant, MTX_DEF); \
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WITNESS_RESTORE(&Giant, Giant)
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/*
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* Debugging
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*/
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#ifndef SMP_DEBUG
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#define mtx_assert(m, what)
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#else /* SMP_DEBUG */
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#define MA_OWNED 1
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#define MA_NOTOWNED 2
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#define mtx_assert(m, what) { \
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switch ((what)) { \
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case MA_OWNED: \
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ASS(mtx_owned((m))); \
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break; \
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case MA_NOTOWNED: \
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ASS(!mtx_owned((m))); \
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break; \
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default: \
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panic("unknown mtx_assert at %s:%d", __FILE__, __LINE__); \
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} \
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}
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#ifdef INVARIANTS
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#define ASS(ex) MPASS(ex)
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#define MPASS(ex) if (!(ex)) panic("Assertion %s failed at %s:%d", \
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#ex, __FILE__, __LINE__)
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#define MPASS2(ex, what) if (!(ex)) panic("Assertion %s failed at %s:%d", \
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what, __FILE__, __LINE__)
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#ifdef MTX_STRS
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char STR_IEN[] = "psr.i";
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char STR_IDIS[] = "!psr.i";
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#else /* MTX_STRS */
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extern char STR_IEN[];
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extern char STR_IDIS[];
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#endif /* MTX_STRS */
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#define ASS_IEN MPASS2((save_intr() & (1 << 14)), STR_IEN)
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#define ASS_IDIS MPASS2(!(save_intr() & (1 << 14)), STR_IDIS)
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#endif /* INVARIANTS */
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#endif /* SMP_DEBUG */
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#if !defined(SMP_DEBUG) || !defined(INVARIANTS)
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#define ASS(ex)
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#define MPASS(ex)
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#define MPASS2(ex, where)
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#define ASS_IEN
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#define ASS_IDIS
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#endif /* !defined(SMP_DEBUG) || !defined(INVARIANTS) */
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#ifdef WITNESS
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#ifndef SMP_DEBUG
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#error WITNESS requires SMP_DEBUG
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#endif /* SMP_DEBUG */
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#define WITNESS_ENTER(m, t, f, l) \
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if ((m)->mtx_witness != NULL) \
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witness_enter((m), (t), (f), (l))
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#define WITNESS_EXIT(m, t, f, l) \
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if ((m)->mtx_witness != NULL) \
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witness_exit((m), (t), (f), (l))
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#define WITNESS_SLEEP(check, m) witness_sleep(check, (m), __FILE__, __LINE__)
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#define WITNESS_SAVE_DECL(n) \
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const char * __CONCAT(n, __wf); \
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int __CONCAT(n, __wl)
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#define WITNESS_SAVE(m, n) \
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do { \
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if ((m)->mtx_witness != NULL) \
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witness_save(m, &__CONCAT(n, __wf), &__CONCAT(n, __wl)); \
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} while (0)
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#define WITNESS_RESTORE(m, n) \
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do { \
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if ((m)->mtx_witness != NULL) \
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witness_restore(m, __CONCAT(n, __wf), __CONCAT(n, __wl)); \
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} while (0)
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void witness_init(struct mtx *, int flag);
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void witness_destroy(struct mtx *);
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void witness_enter(struct mtx *, int, const char *, int);
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void witness_try_enter(struct mtx *, int, const char *, int);
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void witness_exit(struct mtx *, int, const char *, int);
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void witness_display(void(*)(const char *fmt, ...));
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void witness_list(struct proc *);
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int witness_sleep(int, struct mtx *, const char *, int);
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void witness_save(struct mtx *, const char **, int *);
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void witness_restore(struct mtx *, const char *, int);
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#else /* WITNESS */
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#define WITNESS_ENTER(m, t, f, l)
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#define WITNESS_EXIT(m, t, f, l)
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#define WITNESS_SLEEP(check, m)
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#define WITNESS_SAVE_DECL(n)
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#define WITNESS_SAVE(m, n)
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#define WITNESS_RESTORE(m, n)
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/*
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* flag++ is slezoid way of shutting up unused parameter warning
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* in mtx_init()
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*/
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#define witness_init(m, flag) flag++
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#define witness_destroy(m)
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#define witness_enter(m, t, f, l)
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#define witness_try_enter(m, t, f, l)
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#define witness_exit(m, t, f, l)
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#endif /* WITNESS */
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/*
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* Assembly macros (for internal use only)
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*--------------------------------------------------------------------------
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*/
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/*
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* Get a sleep lock, deal with recursion inline
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*/
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#define _V(x) __STRING(x)
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#define _getlock_sleep(mp, tid, type) do { \
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if (ia64_cmpxchg_acq_64(&(mp)->mtx_lock, \
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MTX_UNOWNED, (tid)) != MTX_UNOWNED) { \
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if (((mp)->mtx_lock & MTX_FLAGMASK) != (tid)) \
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mtx_enter_hard(mp, (type) & MTX_HARDOPTS, 0); \
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else { \
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atomic_set_64(&(mp)->mtx_lock, MTX_RECURSE); \
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(mp)->mtx_recurse++; \
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} \
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} \
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} while (0)
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/*
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* Get a spin lock, handle recusion inline (as the less common case)
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*/
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#define _getlock_spin_block(mp, tid, type) do { \
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u_int _psr = save_intr(); \
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disable_intr(); \
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if (ia64_cmpxchg_acq_64(&(mp)->mtx_lock, \
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MTX_UNOWNED, (tid)) != MTX_UNOWNED) \
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mtx_enter_hard(mp, (type) & MTX_HARDOPTS, _psr); \
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else \
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(mp)->mtx_savepsr = _psr; \
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} while (0)
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/*
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* Get a lock without any recursion handling. Calls the hard enter
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* function if we can't get it inline.
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*/
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#define _getlock_norecurse(mp, tid, type) do { \
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if (ia64_cmpxchg_acq_64(&(mp)->mtx_lock, \
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MTX_UNOWNED, (tid)) != MTX_UNOWNED) \
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mtx_enter_hard(mp, (type) & MTX_HARDOPTS, 0); \
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} while (0)
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/*
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* Release a sleep lock assuming we haven't recursed on it, recursion is
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* handled in the hard function.
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*/
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#define _exitlock_norecurse(mp, tid, type) do { \
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if (ia64_cmpxchg_rel_64(&(mp)->mtx_lock, \
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(tid), MTX_UNOWNED) != (tid)) \
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mtx_exit_hard((mp), (type) & MTX_HARDOPTS); \
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} while (0)
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/*
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* Release a sleep lock when its likely we recursed (the code to
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* deal with simple recursion is inline).
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*/
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#define _exitlock(mp, tid, type) do { \
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if (ia64_cmpxchg_rel_64(&(mp)->mtx_lock, \
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(tid), MTX_UNOWNED) != (tid)) { \
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if (((mp)->mtx_lock & MTX_RECURSE) && \
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(--(mp)->mtx_recurse == 0)) \
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atomic_clear_64(&(mp)->mtx_lock, MTX_RECURSE); \
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else \
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mtx_exit_hard((mp), (type) & MTX_HARDOPTS); \
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} \
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} while (0)
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/*
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* Release a spin lock (with possible recursion)
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*/
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#define _exitlock_spin(mp) do { \
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if ((mp)->mtx_recurse == 0) { \
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int _psr = (mp)->mtx_savepsr; \
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ia64_st_rel_64(&(mp)->mtx_lock, MTX_UNOWNED); \
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restore_intr(_psr); \
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} else { \
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(mp)->mtx_recurse--; \
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} \
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} while (0)
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/*
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* Externally visible mutex functions
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*------------------------------------------------------------------------
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*/
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/*
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* Return non-zero if a mutex is already owned by the current thread
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*/
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#define mtx_owned(m) (((m)->mtx_lock & MTX_FLAGMASK) == CURTHD)
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/* Common strings */
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#ifdef MTX_STRS
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char STR_mtx_enter_fmt[] = "GOT %s [%p] at %s:%d r=%d";
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char STR_mtx_bad_type[] = "((type) & (MTX_NORECURSE | MTX_NOSWITCH)) == 0";
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char STR_mtx_exit_fmt[] = "REL %s [%p] at %s:%d r=%d";
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char STR_mtx_owned[] = "mtx_owned(mpp)";
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char STR_mtx_recurse[] = "mpp->mtx_recurse == 0";
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char STR_mtx_try_enter_fmt[] = "TRY_ENTER %s [%p] at %s:%d result=%d";
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#else /* MTX_STRS */
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extern char STR_mtx_enter_fmt[];
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extern char STR_mtx_bad_type[];
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extern char STR_mtx_exit_fmt[];
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extern char STR_mtx_owned[];
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extern char STR_mtx_recurse[];
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extern char STR_mtx_try_enter_fmt[];
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#endif /* MTX_STRS */
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#ifndef KLD_MODULE
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/*
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* Get lock 'm', the macro handles the easy (and most common cases) and
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* leaves the slow stuff to the mtx_enter_hard() function.
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*
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* Note: since type is usually a constant much of this code is optimized out
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*/
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_MTX_INLINE void
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_mtx_enter(struct mtx *mtxp, int type, const char *file, int line)
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{
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struct mtx *mpp = mtxp;
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/* bits only valid on mtx_exit() */
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MPASS2(((type) & (MTX_NORECURSE | MTX_NOSWITCH)) == 0,
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STR_mtx_bad_type);
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if ((type) & MTX_SPIN) {
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/*
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* Easy cases of spin locks:
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*
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* 1) We already own the lock and will simply recurse on it (if
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* RLIKELY)
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*
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* 2) The lock is free, we just get it
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*/
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if ((type) & MTX_RLIKELY) {
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/*
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* Check for recursion, if we already have this lock we
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* just bump the recursion count.
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*/
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if (mpp->mtx_lock == CURTHD) {
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mpp->mtx_recurse++;
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goto done;
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}
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}
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if (((type) & MTX_TOPHALF) == 0) {
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/*
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* If an interrupt thread uses this we must block
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* interrupts here.
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*/
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_getlock_spin_block(mpp, CURTHD, (type) & MTX_HARDOPTS);
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} else
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_getlock_norecurse(mpp, CURTHD, (type) & MTX_HARDOPTS);
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} else {
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/* Sleep locks */
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if ((type) & MTX_RLIKELY)
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_getlock_sleep(mpp, CURTHD, (type) & MTX_HARDOPTS);
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else
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_getlock_norecurse(mpp, CURTHD, (type) & MTX_HARDOPTS);
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}
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done:
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WITNESS_ENTER(mpp, type, file, line);
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CTR5(KTR_LOCK, STR_mtx_enter_fmt,
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mpp->mtx_description, mpp, file, line,
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mpp->mtx_recurse);
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}
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|
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/*
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* Attempt to get MTX_DEF lock, return non-zero if lock acquired
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|
*
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* XXX DOES NOT HANDLE RECURSION
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*/
|
|
_MTX_INLINE int
|
|
_mtx_try_enter(struct mtx *mtxp, int type, const char *file, int line)
|
|
{
|
|
struct mtx *const mpp = mtxp;
|
|
int rval;
|
|
|
|
rval = atomic_cmpset_64(&mpp->mtx_lock, MTX_UNOWNED, CURTHD);
|
|
#ifdef SMP_DEBUG
|
|
if (rval && mpp->mtx_witness != NULL) {
|
|
ASS(mpp->mtx_recurse == 0);
|
|
witness_try_enter(mpp, type, file, line);
|
|
}
|
|
#endif
|
|
CTR5(KTR_LOCK, STR_mtx_try_enter_fmt,
|
|
mpp->mtx_description, mpp, file, line, rval);
|
|
|
|
return rval;
|
|
}
|
|
|
|
/*
|
|
* Release lock m
|
|
*/
|
|
_MTX_INLINE void
|
|
_mtx_exit(struct mtx *mtxp, int type, const char *file, int line)
|
|
{
|
|
struct mtx *const mpp = mtxp;
|
|
|
|
MPASS2(mtx_owned(mpp), STR_mtx_owned);
|
|
WITNESS_EXIT(mpp, type, file, line);
|
|
CTR5(KTR_LOCK, STR_mtx_exit_fmt,
|
|
mpp->mtx_description, mpp, file, line,
|
|
mpp->mtx_recurse);
|
|
if ((type) & MTX_SPIN) {
|
|
if ((type) & MTX_NORECURSE) {
|
|
MPASS2(mpp->mtx_recurse == 0, STR_mtx_recurse);
|
|
ia64_st_rel_64(&mpp->mtx_lock, MTX_UNOWNED);
|
|
if (((type) & MTX_TOPHALF) == 0)
|
|
restore_intr(mpp->mtx_savepsr);
|
|
} else
|
|
if ((type) & MTX_TOPHALF) {
|
|
_exitlock_norecurse(mpp, CURTHD,
|
|
(type) & MTX_HARDOPTS);
|
|
} else
|
|
_exitlock_spin(mpp);
|
|
} else {
|
|
/* Handle sleep locks */
|
|
if ((type) & MTX_RLIKELY) {
|
|
_exitlock(mpp, CURTHD, (type) & MTX_HARDOPTS);
|
|
} else {
|
|
_exitlock_norecurse(mpp, CURTHD,
|
|
(type) & MTX_HARDOPTS);
|
|
}
|
|
}
|
|
}
|
|
|
|
#endif /* KLD_MODULE */
|
|
#endif /* _KERNEL */
|
|
|
|
#else /* !LOCORE */
|
|
|
|
/*
|
|
* Simple assembly macros to get and release non-recursive spin locks
|
|
*/
|
|
#define MTX_ENTER(lck, rPSR, rOLD, rNEW, rLCK) \
|
|
mov rPSR=psr ; \
|
|
mov rNEW=globalp ; \
|
|
addl rLCK=@ltoff(lck),gp ;; \
|
|
ld8 rLCK=[rLCK] ;; \
|
|
add rLCK=MTX_LOCK,rLCK ;; \
|
|
rsm psr.i ; \
|
|
mov ar.ccv=MTX_UNOWNED ; \
|
|
add rNEW=PC_CURPROC,rNEW ;; \
|
|
ld8 rNEW=[rNEW] ;; \
|
|
1: cmpxchg8.acq rOLD=[rLCK],rNEW,ar.ccv ;; \
|
|
cmp.eq p1,p0=MTX_UNOWNED,rOLD ;; \
|
|
(p1) br.cond.spnt.few 1b ;; \
|
|
addl rLCK=@ltoff(lck),gp ;; \
|
|
ld8 rLCK=[rLCK] ;; \
|
|
add rLCK=MTX_SAVEPSR,rLCK ;; \
|
|
st4 [rLCK]=rPSR
|
|
|
|
#define MTX_EXIT(lck, rTMP, rLCK) \
|
|
mov rTMP=MTX_UNOWNED ; \
|
|
addl rLCK=@ltoff(lck),gp;; \
|
|
ld8 rLCK=[rLCK];; \
|
|
add rLCK=MTX_LOCK,rLCK;; \
|
|
st8.rel [rLCK]=rTMP,MTX_SAVEPSR-MTX_LOCK ;; \
|
|
ld4 rTMP=[rLCK] ;; \
|
|
mov psr.l=rTMP ;; \
|
|
srlz.d
|
|
|
|
#endif /* !LOCORE */
|
|
|
|
#endif /* __MACHINE_MUTEX_H */
|