vm_dumpset.h

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2020, Scott Phillips <scottph@freebsd.org>
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions
    8  * are met:
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice unmodified, this list of conditions, and the following
   11  *    disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   21  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   22  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   23  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   25  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   26  *
   27  * $FreeBSD$
   28  */
   29 
   30 #ifndef _SYS_DUMPSET_H_
   31 #define _SYS_DUMPSET_H_
   32 
   33 #include <sys/_bitset.h>
   34 #include <sys/bitset.h>
   35 
   36 extern struct bitset *vm_page_dump;
   37 extern long vm_page_dump_pages;
   38 extern vm_paddr_t dump_avail[PHYS_AVAIL_COUNT];
   39 
   40 /* For the common case: add/remove a page from the minidump bitset. */
   41 #define dump_add_page(pa)       vm_page_dump_add(vm_page_dump, pa)
   42 #define dump_drop_page(pa)      vm_page_dump_drop(vm_page_dump, pa)
   43 
   44 static inline void
   45 vm_page_dump_add(struct bitset *bitset, vm_paddr_t pa)
   46 {
   47         vm_pindex_t adj;
   48         int i;
   49 
   50         adj = 0;
   51         for (i = 0; dump_avail[i + 1] != 0; i += 2) {
   52                 if (pa >= dump_avail[i] && pa < dump_avail[i + 1]) {
   53                         BIT_SET_ATOMIC(vm_page_dump_pages,
   54                             (pa >> PAGE_SHIFT) - (dump_avail[i] >> PAGE_SHIFT) +
   55                             adj, bitset);
   56                         return;
   57                 }
   58                 adj += howmany(dump_avail[i + 1], PAGE_SIZE) -
   59                     dump_avail[i] / PAGE_SIZE;
   60         }
   61 }
   62 
   63 static inline void
   64 vm_page_dump_drop(struct bitset *bitset, vm_paddr_t pa)
   65 {
   66         vm_pindex_t adj;
   67         int i;
   68 
   69         adj = 0;
   70         for (i = 0; dump_avail[i + 1] != 0; i += 2) {
   71                 if (pa >= dump_avail[i] && pa < dump_avail[i + 1]) {
   72                         BIT_CLR_ATOMIC(vm_page_dump_pages,
   73                             (pa >> PAGE_SHIFT) - (dump_avail[i] >> PAGE_SHIFT) +
   74                             adj, bitset);
   75                         return;
   76                 }
   77                 adj += howmany(dump_avail[i + 1], PAGE_SIZE) -
   78                     dump_avail[i] / PAGE_SIZE;
   79         }
   80 }
   81 
   82 static inline vm_paddr_t
   83 vm_page_dump_index_to_pa(int bit)
   84 {
   85         int i, tot;
   86 
   87         for (i = 0; dump_avail[i + 1] != 0; i += 2) {
   88                 tot = howmany(dump_avail[i + 1], PAGE_SIZE) -
   89                     dump_avail[i] / PAGE_SIZE;
   90                 if (bit < tot)
   91                         return ((vm_paddr_t)bit * PAGE_SIZE +
   92                             (dump_avail[i] & ~PAGE_MASK));
   93                 bit -= tot;
   94         }
   95         return (0);
   96 }
   97 
   98 #define VM_PAGE_DUMP_FOREACH(bitset, pa)                                \
   99         for (vm_pindex_t __b = BIT_FFS(vm_page_dump_pages, bitset);     \
  100             (pa) = vm_page_dump_index_to_pa(__b - 1), __b != 0;         \
  101             __b = BIT_FFS_AT(vm_page_dump_pages, bitset, __b))
  102 
  103 #endif  /* _SYS_DUMPSET_H_ */

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FreeBSD/Linux Kernel Cross Reference sys/vm/vm_dumpset.h

FreeBSD/Linux Kernel Cross Reference
sys/vm/vm_dumpset.h