highmem.h

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2010 Isilon Systems, Inc.
    5  * Copyright (c) 2016 Matthew Macy (mmacy@mattmacy.io)
    6  * Copyright (c) 2017 Mellanox Technologies, Ltd.
    7  * Copyright (c) 2021 Vladimir Kondratyev <wulf@FreeBSD.org>
    8  *
    9  * Redistribution and use in source and binary forms, with or without
   10  * modification, are permitted provided that the following conditions are
   11  * met:
   12  * 1. Redistributions of source code must retain the above copyright
   13  *    notice, this list of conditions and the following disclaimer.
   14  * 2. Redistributions in binary form must reproduce the above copyright
   15  *    notice, this list of conditions and the following disclaimer in
   16  *    the documentation and/or other materials provided with the
   17  *    distribution.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   29  * SUCH DAMAGE.
   30  */
   31 
   32 #ifndef _LINUXKPI_LINUX_HIGHMEM_H_
   33 #define _LINUXKPI_LINUX_HIGHMEM_H_
   34 
   35 #include <sys/types.h>
   36 #include <sys/lock.h>
   37 #include <sys/mutex.h>
   38 #include <sys/proc.h>
   39 #include <sys/sched.h>
   40 #include <sys/sf_buf.h>
   41 
   42 #include <vm/vm.h>
   43 #include <vm/vm_page.h>
   44 #include <vm/pmap.h>
   45 
   46 #include <linux/page.h>
   47 
   48 #define PageHighMem(p)          (0)
   49 
   50 static inline vm_page_t
   51 kmap_to_page(void *addr)
   52 {
   53         return (virt_to_page(addr));
   54 }
   55 
   56 static inline void *
   57 kmap(vm_page_t page)
   58 {
   59         struct sf_buf *sf;
   60 
   61         if (PMAP_HAS_DMAP) {
   62                 return ((void *)PHYS_TO_DMAP(VM_PAGE_TO_PHYS(page)));
   63         } else {
   64                 sched_pin();
   65                 sf = sf_buf_alloc(page, SFB_NOWAIT | SFB_CPUPRIVATE);
   66                 if (sf == NULL) {
   67                         sched_unpin();
   68                         return (NULL);
   69                 }
   70                 return ((void *)sf_buf_kva(sf));
   71         }
   72 }
   73 
   74 static inline void *
   75 kmap_atomic_prot(vm_page_t page, pgprot_t prot)
   76 {
   77         vm_memattr_t attr = pgprot2cachemode(prot);
   78 
   79         if (attr != VM_MEMATTR_DEFAULT) {
   80                 vm_page_lock(page);
   81                 page->flags |= PG_FICTITIOUS;
   82                 vm_page_unlock(page);
   83                 pmap_page_set_memattr(page, attr);
   84         }
   85         return (kmap(page));
   86 }
   87 
   88 static inline void *
   89 kmap_atomic(vm_page_t page)
   90 {
   91         return (kmap_atomic_prot(page, VM_PROT_ALL));
   92 }
   93 
   94 static inline void
   95 kunmap(vm_page_t page)
   96 {
   97         struct sf_buf *sf;
   98 
   99         if (!PMAP_HAS_DMAP) {
  100                 /* lookup SF buffer in list */
  101                 sf = sf_buf_alloc(page, SFB_NOWAIT | SFB_CPUPRIVATE);
  102 
  103                 /* double-free */
  104                 sf_buf_free(sf);
  105                 sf_buf_free(sf);
  106 
  107                 sched_unpin();
  108         }
  109 }
  110 
  111 static inline void
  112 kunmap_atomic(void *vaddr)
  113 {
  114         if (!PMAP_HAS_DMAP)
  115                 kunmap(virt_to_page(vaddr));
  116 }
  117 
  118 #endif  /* _LINUXKPI_LINUX_HIGHMEM_H_ */

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FreeBSD/Linux Kernel Cross Reference sys/compat/linuxkpi/common/include/linux/highmem.h

FreeBSD/Linux Kernel Cross Reference
sys/compat/linuxkpi/common/include/linux/highmem.h