337 lines
8.7 KiB
C
337 lines
8.7 KiB
C
/* $NetBSD: pack.c,v 1.15 2003/11/24 21:44:37 christos Exp $ */
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/*
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* Copyright (c) 1992, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This software was developed by the Computer Systems Engineering group
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* at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
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* contributed to Berkeley.
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*
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* All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Lawrence Berkeley Laboratories.
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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. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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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* from: @(#)pack.c 8.1 (Berkeley) 6/6/93
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*/
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#include <sys/param.h>
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#include <stdlib.h>
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#include <string.h>
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#include "defs.h"
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/*
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* Packing. We have three separate kinds of packing here.
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*
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* First, we pack device instances which have identical parent specs.
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*
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* Second, we pack locators. Given something like
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*
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* hp0 at mba0 drive 0
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* hp* at mba* drive ?
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* ht0 at mba0 drive 0
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* tu0 at ht0 slave 0
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* ht* at mba* drive ?
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* tu* at ht* slave ?
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*
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* (where the default drive and slave numbers are -1), we have three
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* locators whose value is 0 and three whose value is -1. Rather than
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* emitting six integers, we emit just two.
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*
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* When packing locators, we would like to find sequences such as
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* {1 2 3} {2 3 4} {3} {4 5}
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* and turn this into the flat sequence {1 2 3 4 5}, with each subsequence
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* given by the appropriate offset (here 0, 1, 2, and 3 respectively).
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* Non-overlapping packing is much easier, and so we use that here
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* and miss out on the chance to squeeze the locator sequence optimally.
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* (So it goes.)
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*/
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typedef int (*vec_cmp_func)(const void *, int, int);
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#define TAILHSIZE 128
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#define PVHASH(i) ((i) & (TAILHSIZE - 1))
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#define LOCHASH(l) (((long)(l) >> 2) & (TAILHSIZE - 1))
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struct tails {
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struct tails *t_next;
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int t_ends_at;
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};
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static struct tails *tails[TAILHSIZE];
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static int locspace;
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static void packdevi(void);
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static void packlocs(void);
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static int sameas(struct devi *, struct devi *);
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static int findvec(const void *, int, int, vec_cmp_func, int);
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static int samelocs(const void *, int, int);
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static int addlocs(const char **, int);
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static int loclencmp(const void *, const void *);
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static void resettails(void);
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void
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pack(void)
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{
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struct pspec *p;
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struct devi *i;
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/* Pack instances and make parent vectors. */
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packdevi();
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/*
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* Now that we know what we have, find upper limits on space
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* needed for the loc[] table. The loc table size is bounded by
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* what we would get if no packing occurred.
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*/
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locspace = 0;
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TAILQ_FOREACH(i, &alldevi, i_next) {
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if (i->i_collapsed)
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continue;
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if ((p = i->i_pspec) == NULL)
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continue;
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locspace += p->p_iattr->a_loclen;
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}
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/* Allocate and pack loc[]. */
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locators.vec = ecalloc(locspace, sizeof(*locators.vec));
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locators.used = 0;
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packlocs();
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}
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/*
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* Pack device instances together wherever possible.
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*/
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void
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packdevi(void)
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{
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struct devi *firststar, *i, **ip, *l, *p;
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struct devbase *d;
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int j, m, n;
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/*
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* Sort all the cloning units to after the non-cloning units,
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* preserving order of cloning and non-cloning units with
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* respect to other units of the same type.
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*
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* Algorithm: Walk down the list until the first cloning unit is
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* seen for the second time (or until the end of the list, if there
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* are no cloning units on the list), moving starred units to the
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* end of the list.
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*/
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TAILQ_FOREACH(d, &allbases, d_next) {
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ip = &d->d_ihead;
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firststar = NULL;
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for (i = *ip; i != firststar; i = *ip) {
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if (i->i_unit != STAR) {
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/* try i->i_bsame next */
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ip = &i->i_bsame;
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} else {
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if (firststar == NULL)
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firststar = i;
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*d->d_ipp = i;
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d->d_ipp = &i->i_bsame;
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*ip = i->i_bsame;
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i->i_bsame = NULL;
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/* leave ip alone; try (old) i->i_bsame next */
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}
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}
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}
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packed = ecalloc(ndevi + 1, sizeof *packed);
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n = 0;
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TAILQ_FOREACH(d, &allbases, d_next) {
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/*
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* For each instance of each device, add or collapse
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* all its aliases.
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*/
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for (i = d->d_ihead; i != NULL; i = i->i_bsame) {
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m = n;
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for (l = i; l != NULL; l = l->i_alias) {
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l->i_locoff = -1;
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/* try to find an equivalent for l */
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for (j = m; j < n; j++) {
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p = packed[j];
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if (sameas(l, p)) {
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l->i_collapsed = 1;
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l->i_cfindex = p->i_cfindex;
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goto nextalias;
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}
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}
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/* could not find a suitable alias */
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l->i_collapsed = 0;
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l->i_cfindex = n;
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packed[n++] = l;
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nextalias:;
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}
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}
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}
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npacked = n;
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packed[n] = NULL;
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}
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/*
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* Return true if two aliases are "the same". In this case, they need
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* to have the same parent spec, have the same config flags, and have
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* the same locators.
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*/
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static int
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sameas(struct devi *i1, struct devi *i2)
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{
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const char **p1, **p2;
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if (i1->i_pspec != i2->i_pspec)
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return (0);
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if (i1->i_cfflags != i2->i_cfflags)
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return (0);
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for (p1 = i1->i_locs, p2 = i2->i_locs; *p1 == *p2; p2++)
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if (*p1++ == 0)
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return (1);
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return (0);
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}
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static void
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packlocs(void)
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{
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struct pspec *ps;
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struct devi **p, *i;
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int l,o;
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extern int Pflag;
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qsort(packed, npacked, sizeof *packed, loclencmp);
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for (p = packed; (i = *p) != NULL; p++) {
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if ((ps = i->i_pspec) != NULL &&
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(l = ps->p_iattr->a_loclen) > 0) {
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if (Pflag) {
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o = findvec(i->i_locs,
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LOCHASH(i->i_locs[l - 1]), l,
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samelocs, locators.used);
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i->i_locoff = o < 0 ?
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addlocs(i->i_locs, l) : o;
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} else
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i->i_locoff = addlocs(i->i_locs, l);
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} else
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i->i_locoff = -1;
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}
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resettails();
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}
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/*
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* Return the index at which the given vector already exists, or -1
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* if it is not anywhere in the current set. If we return -1, we assume
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* our caller will add it at the end of the current set, and we make
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* sure that next time, we will find it there.
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*/
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static int
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findvec(const void *ptr, int hash, int len, vec_cmp_func cmp, int nextplace)
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{
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struct tails *t, **hp;
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int off;
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hp = &tails[hash];
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for (t = *hp; t != NULL; t = t->t_next) {
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off = t->t_ends_at - len;
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if (off >= 0 && (*cmp)(ptr, off, len))
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return (off);
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}
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t = ecalloc(1, sizeof(*t));
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t->t_next = *hp;
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*hp = t;
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t->t_ends_at = nextplace + len;
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return (-1);
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}
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/*
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* Comparison function for locators.
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*/
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static int
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samelocs(const void *ptr, int off, int len)
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{
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const char **p, **q;
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for (p = &locators.vec[off], q = (const char **)ptr; --len >= 0;)
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if (*p++ != *q++)
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return (0); /* different */
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return (1); /* same */
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}
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/*
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* Add the given locators at the end of the global loc[] table.
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*/
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static int
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addlocs(const char **locs, int len)
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{
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const char **p;
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int ret;
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ret = locators.used;
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if ((locators.used = ret + len) > locspace)
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panic("addlocs: overrun");
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for (p = &locators.vec[ret]; --len >= 0;)
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*p++ = *locs++;
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return (ret);
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}
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/*
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* Comparison function for qsort-by-locator-length, longest first.
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* We rashly assume that subtraction of these lengths does not overflow.
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*/
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static int
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loclencmp(const void *a, const void *b)
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{
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struct pspec *p1, *p2;
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int l1, l2;
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p1 = (*(struct devi **)a)->i_pspec;
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l1 = p1 != NULL ? p1->p_iattr->a_loclen : 0;
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p2 = (*(struct devi **)b)->i_pspec;
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l2 = p2 != NULL ? p2->p_iattr->a_loclen : 0;
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return (l2 - l1);
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}
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static void
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resettails(void)
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{
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struct tails **p, *t, *next;
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int i;
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for (p = tails, i = TAILHSIZE; --i >= 0; p++) {
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for (t = *p; t != NULL; t = next) {
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next = t->t_next;
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free(t);
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}
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*p = NULL;
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}
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}
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