564 lines
16 KiB
C
564 lines
16 KiB
C
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/*-
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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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#include <machine/atomic.h>
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#include <machine/cpufunc.h>
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#include <machine/globaldata.h>
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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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struct proc; /* XXX */
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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_saveipl; /* saved ipl (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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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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typedef struct mtx mtx_t;
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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(mtx_t *m, char *description, int flag);
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void mtx_enter_hard(mtx_t *, int type, int ipl);
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void mtx_exit_hard(mtx_t *, int type);
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void mtx_destroy(mtx_t *m);
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/* Global locks */
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extern mtx_t sched_lock;
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extern mtx_t 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[] = "fl & 0x200";
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char STR_IDIS[] = "!(fl & 0x200)";
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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((alpha_pal_rdps & ALPHA_PSL_IPL_MASK)
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== ALPHA_PSL_IPL_HIGH, STR_IEN)
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#define ASS_IDIS MPASS2((alpha_pal_rdps & ALPHA_PSL_IPL_MASK)
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!= ALPHA_PSL_IPL_HIGH, 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, f) \
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if ((m)->mtx_witness != NULL) \
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witness_enter((m), (f), __FILE__, __LINE__)
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#define WITNESS_EXIT(m, f) \
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if ((m)->mtx_witness != NULL) \
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witness_exit((m), (f), __FILE__, __LINE__)
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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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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(mtx_t *, int flag);
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void witness_destroy(mtx_t *);
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void witness_enter(mtx_t *, int, char *, int);
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void witness_try_enter(mtx_t *, int, char *, int);
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void witness_exit(mtx_t *, int, 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, mtx_t *, char *, int);
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void witness_save(mtx_t *, char **, int *);
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void witness_restore(mtx_t *, char *, int);
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#else /* WITNESS */
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#define WITNESS_ENTER(m, flag)
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#define WITNESS_EXIT(m, flag)
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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, flag, f, l)
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#define witness_try_enter(m, flag, f, l )
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#define witness_exit(m, flag, 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 (atomic_cmpset_64(&(mp)->mtx_lock, MTX_UNOWNED, (tid)) == 0) { \
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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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if (((mp)->mtx_lock & MTX_RECURSE) == 0) \
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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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} else { \
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alpha_mb(); \
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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 _ipl = alpha_pal_rdps() & ALPHA_PSL_IPL_MASK; \
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if (atomic_cmpset_64(&(mp)->mtx_lock, MTX_UNOWNED, (tid)) == 0) \
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mtx_enter_hard(mp, (type) & MTX_HARDOPTS, _ipl); \
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else { \
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alpha_mb(); \
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(mp)->mtx_saveipl = _ipl; \
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} \
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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 (atomic_cmpset_64(&(mp)->mtx_lock, MTX_UNOWNED, (tid)) == 0) \
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mtx_enter_hard((mp), (type) & MTX_HARDOPTS, 0); \
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else \
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alpha_mb(); \
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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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alpha_mb(); \
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if (atomic_cmpset_64(&(mp)->mtx_lock, (tid), MTX_UNOWNED) == 0) \
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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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alpha_mb(); \
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if (atomic_cmpset_64(&(mp)->mtx_lock, (tid), MTX_UNOWNED) == 0) {\
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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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int _ipl = (mp)->mtx_saveipl; \
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alpha_mb(); \
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if ((mp)->mtx_recurse == 0 || (--(mp)->mtx_recurse) == 0) \
|
||
|
|
atomic_cmpset_64(&(mp)->mtx_lock, (mp)->mtx_lock, \
|
||
|
|
MTX_UNOWNED); \
|
||
|
|
alpha_pal_swpipl(_ipl); \
|
||
|
|
} while (0)
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Externally visible mutex functions
|
||
|
|
*------------------------------------------------------------------------
|
||
|
|
*/
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Return non-zero if a mutex is already owned by the current thread
|
||
|
|
*/
|
||
|
|
#define mtx_owned(m) (((m)->mtx_lock & MTX_FLAGMASK) == CURTHD)
|
||
|
|
|
||
|
|
/* Common strings */
|
||
|
|
#ifdef MTX_STRS
|
||
|
|
char STR_mtx_enter_fmt[] = "GOT %s [%p] at %s:%d r=%d";
|
||
|
|
char STR_mtx_bad_type[] = "((type) & (MTX_NORECURSE | MTX_NOSWITCH)) == 0";
|
||
|
|
char STR_mtx_exit_fmt[] = "REL %s [%p] at %s:%d r=%d";
|
||
|
|
char STR_mtx_owned[] = "mtx_owned(_mpp)";
|
||
|
|
char STR_mtx_recurse[] = "_mpp->mtx_recurse == 0";
|
||
|
|
char STR_mtx_try_enter_fmt[] = "TRY_ENTER %s [%p] at %s:%d result=%d";
|
||
|
|
#else /* MTX_STRS */
|
||
|
|
extern char STR_mtx_enter_fmt[];
|
||
|
|
extern char STR_mtx_bad_type[];
|
||
|
|
extern char STR_mtx_exit_fmt[];
|
||
|
|
extern char STR_mtx_owned[];
|
||
|
|
extern char STR_mtx_recurse[];
|
||
|
|
extern char STR_mtx_try_enter_fmt[];
|
||
|
|
#endif /* MTX_STRS */
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Get lock 'm', the macro handles the easy (and most common cases) and
|
||
|
|
* leaves the slow stuff to the mtx_enter_hard() function.
|
||
|
|
*
|
||
|
|
* Note: since type is usually a constant much of this code is optimized out
|
||
|
|
*/
|
||
|
|
#define mtx_enter(mtxp, type) do { \
|
||
|
|
mtx_t * _mpp = mtxp; \
|
||
|
|
\
|
||
|
|
/* bits only valid on mtx_exit() */ \
|
||
|
|
MPASS2(((type) & (MTX_NORECURSE | MTX_NOSWITCH)) == 0, STR_mtx_bad_type); \
|
||
|
|
\
|
||
|
|
do { \
|
||
|
|
if ((type) & MTX_SPIN) { \
|
||
|
|
/* \
|
||
|
|
* Easy cases of spin locks: \
|
||
|
|
* \
|
||
|
|
* 1) We already own the lock and will simply \
|
||
|
|
* recurse on it (if RLIKELY) \
|
||
|
|
* \
|
||
|
|
* 2) The lock is free, we just get it \
|
||
|
|
*/ \
|
||
|
|
if ((type) & MTX_RLIKELY) { \
|
||
|
|
/* \
|
||
|
|
* Check for recursion, if we already \
|
||
|
|
* have this lock we just bump the \
|
||
|
|
* recursion count. \
|
||
|
|
*/ \
|
||
|
|
if (_mpp->mtx_lock == CURTHD) { \
|
||
|
|
_mpp->mtx_recurse++; \
|
||
|
|
break; /* Done */ \
|
||
|
|
} \
|
||
|
|
} \
|
||
|
|
\
|
||
|
|
if (((type) & MTX_TOPHALF) == 0) \
|
||
|
|
/* \
|
||
|
|
* If an interrupt thread uses this \
|
||
|
|
* we must block interrupts here. \
|
||
|
|
*/ \
|
||
|
|
_getlock_spin_block(_mpp, CURTHD, \
|
||
|
|
(type) & MTX_HARDOPTS); \
|
||
|
|
else \
|
||
|
|
_getlock_norecurse(_mpp, CURTHD, \
|
||
|
|
(type) & MTX_HARDOPTS); \
|
||
|
|
} else { \
|
||
|
|
/* Sleep locks */ \
|
||
|
|
if ((type) & MTX_RLIKELY) \
|
||
|
|
_getlock_sleep(_mpp, CURTHD, \
|
||
|
|
(type) & MTX_HARDOPTS); \
|
||
|
|
else \
|
||
|
|
_getlock_norecurse(_mpp, CURTHD, \
|
||
|
|
(type) & MTX_HARDOPTS); \
|
||
|
|
} \
|
||
|
|
} while (0); \
|
||
|
|
WITNESS_ENTER(_mpp, type); \
|
||
|
|
CTR5(KTR_LOCK, STR_mtx_enter_fmt, \
|
||
|
|
(_mpp)->mtx_description, (_mpp), __FILE__, __LINE__, \
|
||
|
|
(_mpp)->mtx_recurse); \
|
||
|
|
} while (0)
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Attempt to get MTX_DEF lock, return non-zero if lock acquired
|
||
|
|
*
|
||
|
|
* XXX DOES NOT HANDLE RECURSION
|
||
|
|
*/
|
||
|
|
#ifdef SMP_DEBUG
|
||
|
|
#define mtx_try_enter(mtxp, type) ({ \
|
||
|
|
mtx_t *const _mpp = mtxp; \
|
||
|
|
int _rval; \
|
||
|
|
\
|
||
|
|
_rval = atomic_cmpset_int(&_mpp->mtx_lock, MTX_UNOWNED, CURTHD);\
|
||
|
|
if (_rval && (_mpp)->mtx_witness != NULL) { \
|
||
|
|
ASS((_mpp)->mtx_recurse == 0); \
|
||
|
|
witness_try_enter(_mpp, type, __FILE__, __LINE__); \
|
||
|
|
} \
|
||
|
|
CTR5(KTR_LOCK, STR_mtx_try_enter_fmt, \
|
||
|
|
(_mpp)->mtx_description, (_mpp), __FILE__, __LINE__, \
|
||
|
|
_rval); \
|
||
|
|
_rval; \
|
||
|
|
})
|
||
|
|
|
||
|
|
#else /* SMP_DEBUG */
|
||
|
|
|
||
|
|
#define mtx_try_enter(mtxp, type) ({ \
|
||
|
|
mtx_t *const _mpp = mtxp; \
|
||
|
|
int _rval; \
|
||
|
|
\
|
||
|
|
_rval = atomic_cmpset_int(&_mpp->mtx_lock, MTX_UNOWNED, CURTHD);\
|
||
|
|
CTR5(KTR_LOCK, STR_mtx_try_enter_fmt, \
|
||
|
|
(_mpp)->mtx_description, (_mpp), __FILE__, __LINE__, \
|
||
|
|
_rval); \
|
||
|
|
_rval; \
|
||
|
|
})
|
||
|
|
|
||
|
|
#endif /* SMP_DEBUG */
|
||
|
|
|
||
|
|
#if 0
|
||
|
|
#define mtx_legal2block() ({ \
|
||
|
|
register int _l2b; \
|
||
|
|
__asm __volatile ( \
|
||
|
|
" pushfl;" \
|
||
|
|
" popl %%eax;" \
|
||
|
|
" andl $0x200, %%eax;" \
|
||
|
|
: "=a" (_l2b) \
|
||
|
|
: \
|
||
|
|
: "cc"); \
|
||
|
|
_l2b; \
|
||
|
|
})
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#define mtx_legal2block() (read_eflags() & 0x200)
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Release lock m
|
||
|
|
*/
|
||
|
|
#define mtx_exit(mtxp, type) do { \
|
||
|
|
mtx_t *const _mpp = mtxp; \
|
||
|
|
\
|
||
|
|
MPASS2(mtx_owned(_mpp), STR_mtx_owned); \
|
||
|
|
WITNESS_EXIT(_mpp, type); \
|
||
|
|
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); \
|
||
|
|
atomic_cmpset_64(&_mpp->mtx_lock, _mpp->mtx_lock, \
|
||
|
|
MTX_UNOWNED); \
|
||
|
|
if (((type) & MTX_TOPHALF) == 0) { \
|
||
|
|
splx(_mpp->mtx_saveipl); \
|
||
|
|
} \
|
||
|
|
} 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); \
|
||
|
|
} \
|
||
|
|
} while (0)
|
||
|
|
#endif /* _KERNEL */
|
||
|
|
|
||
|
|
#else /* !LOCORE */
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Simple assembly macros to get and release non-recursive spin locks
|
||
|
|
*/
|
||
|
|
#define MTX_ENTER(lck) \
|
||
|
|
call_pal PAL_OSF1_rdps; \
|
||
|
|
and v0, ALPHA_PSL_IPL_MASK, v0; \
|
||
|
|
1: ldq_l a0, lck+MTX_LOCK; \
|
||
|
|
cmpeq a0, MTX_UNOWNED, a1; \
|
||
|
|
beq a1, 1b; \
|
||
|
|
ldq a0, PC_CURPROC(globalp); \
|
||
|
|
stq_c a0, lck+MTX_LOCK; \
|
||
|
|
beq a0, 1b; \
|
||
|
|
mb; \
|
||
|
|
stl v0, lck+MTX_SAVEIPL; \
|
||
|
|
ldq a0, ALPHA_PSL_IPL_HIGH; \
|
||
|
|
call_pal PSL_OSF1_swpipl
|
||
|
|
|
||
|
|
#define MTX_EXIT(lck) \
|
||
|
|
mb; \
|
||
|
|
ldiq a0, MTX_UNOWNED; \
|
||
|
|
stq a0, lck+MTX_LOCK; \
|
||
|
|
ldl a0, lck+MTX_SAVEIPL; \
|
||
|
|
call_pal PAL_OSF1_swpipl
|
||
|
|
|
||
|
|
#endif /* !LOCORE */
|
||
|
|
|
||
|
|
#endif /* __MACHINE_MUTEX_H */
|