The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/sys/sf_buf.h

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    1 /*-
    2  * Copyright (c) 2014 Gleb Smirnoff <glebius@FreeBSD.org>
    3  * Copyright (c) 2003-2004 Alan L. Cox <alc@cs.rice.edu>
    4  * All rights reserved.
    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, this list of conditions and the following disclaimer.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  *
   15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   25  * SUCH DAMAGE.
   26  *
   27  * $FreeBSD: releng/11.2/sys/sys/sf_buf.h 331722 2018-03-29 02:50:57Z eadler $
   28  */
   29 
   30 #ifndef _SYS_SF_BUF_H_
   31 #define _SYS_SF_BUF_H_
   32 
   33 struct sfstat {                         /* sendfile statistics */
   34         uint64_t        sf_syscalls;    /* times sendfile was called */
   35         uint64_t        sf_noiocnt;     /* times sendfile didn't require I/O */
   36         uint64_t        sf_iocnt;       /* times sendfile had to do disk I/O */
   37         uint64_t        sf_pages_read;  /* pages read as part of a request */
   38         uint64_t        sf_pages_valid; /* pages were valid for a request */
   39         uint64_t        sf_rhpages_requested;   /* readahead pages requested */
   40         uint64_t        sf_rhpages_read;        /* readahead pages read */
   41         uint64_t        sf_busy;        /* times aborted on a busy page */
   42         uint64_t        sf_allocfail;   /* times sfbuf allocation failed */
   43         uint64_t        sf_allocwait;   /* times sfbuf allocation had to wait */
   44 };
   45 
   46 #ifdef _KERNEL
   47 #include <sys/types.h>
   48 #include <sys/systm.h>
   49 #include <sys/counter.h>
   50 #include <vm/vm.h>
   51 #include <vm/vm_param.h>
   52 #include <vm/vm_page.h>
   53 
   54 /*
   55  * Sf_bufs, or sendfile(2) buffers provide a vm_page that is mapped
   56  * into kernel address space. Note, that they aren't used only
   57  * by sendfile(2)!
   58  *
   59  * Sf_bufs could be implemented as a feature of vm_page_t, but that
   60  * would require growth of the structure. That's why they are implemented
   61  * as a separate hash indexed by vm_page address. Implementation lives in
   62  * kern/subr_sfbuf.c. Meanwhile, most 64-bit machines have a physical map,
   63  * so they don't require this hash at all, thus ignore subr_sfbuf.c.
   64  *
   65  * Different 32-bit architectures demand different requirements on sf_buf
   66  * hash and functions. They request features in machine/vmparam.h, which
   67  * enable parts of this file. They can also optionally provide helpers in
   68  * machine/sf_buf.h
   69  *
   70  * Defines are:
   71  * SFBUF                This machine requires sf_buf hash.
   72  *                      subr_sfbuf.c should be compiled.
   73  * SFBUF_CPUSET         This machine can perform SFB_CPUPRIVATE mappings,
   74  *                      that do no invalidate cache on the rest of CPUs.
   75  * SFBUF_NOMD           This machine doesn't have machine/sf_buf.h
   76  *
   77  * SFBUF_OPTIONAL_DIRECT_MAP    Value of this define is used as boolean
   78  *                              variable that tells whether machine is
   79  *                              capable of direct map or not at runtime.
   80  * SFBUF_MAP            This machine provides its own sf_buf_map() and
   81  *                      sf_buf_unmap().
   82  * SFBUF_PROCESS_PAGE   This machine provides sf_buf_process_page()
   83  *                      function.
   84  */
   85 
   86 #ifdef SFBUF
   87 #if defined(SMP) && defined(SFBUF_CPUSET)
   88 #include <sys/_cpuset.h>
   89 #endif
   90 #include <sys/queue.h>
   91 
   92 struct sf_buf {
   93         LIST_ENTRY(sf_buf)      list_entry;     /* list of buffers */
   94         TAILQ_ENTRY(sf_buf)     free_entry;     /* list of buffers */
   95         vm_page_t               m;              /* currently mapped page */
   96         vm_offset_t             kva;            /* va of mapping */
   97         int                     ref_count;      /* usage of this mapping */
   98 #if defined(SMP) && defined(SFBUF_CPUSET)
   99         cpuset_t                cpumask;        /* where mapping is valid */
  100 #endif
  101 };
  102 #else /* ! SFBUF */
  103 struct sf_buf;
  104 #endif /* SFBUF */
  105 
  106 #ifndef SFBUF_NOMD
  107 #include <machine/sf_buf.h>
  108 #endif
  109 #ifdef SFBUF_OPTIONAL_DIRECT_MAP
  110 #include <machine/md_var.h>
  111 #endif
  112 
  113 #ifdef SFBUF
  114 struct sf_buf *sf_buf_alloc(struct vm_page *, int);
  115 void sf_buf_free(struct sf_buf *);
  116 void sf_buf_ref(struct sf_buf *);
  117 
  118 static inline vm_offset_t
  119 sf_buf_kva(struct sf_buf *sf)
  120 {
  121 #ifdef SFBUF_OPTIONAL_DIRECT_MAP
  122         if (SFBUF_OPTIONAL_DIRECT_MAP)
  123                 return (SFBUF_PHYS_DMAP(VM_PAGE_TO_PHYS((vm_page_t)sf)));
  124 #endif
  125 
  126         return (sf->kva);
  127 }
  128 
  129 static inline vm_page_t
  130 sf_buf_page(struct sf_buf *sf)
  131 {
  132 #ifdef SFBUF_OPTIONAL_DIRECT_MAP
  133         if (SFBUF_OPTIONAL_DIRECT_MAP)
  134                 return ((vm_page_t)sf);
  135 #endif
  136 
  137         return (sf->m);
  138 }
  139 
  140 #ifndef SFBUF_MAP
  141 #include <vm/pmap.h>
  142 
  143 static inline void
  144 sf_buf_map(struct sf_buf *sf, int flags)
  145 {
  146 
  147         pmap_qenter(sf->kva, &sf->m, 1);
  148 }
  149 
  150 static inline int
  151 sf_buf_unmap(struct sf_buf *sf)
  152 {
  153 
  154         return (0);
  155 }
  156 #endif /* SFBUF_MAP */
  157 
  158 #if defined(SMP) && defined(SFBUF_CPUSET)
  159 void sf_buf_shootdown(struct sf_buf *, int);
  160 #endif
  161 
  162 #ifdef SFBUF_PROCESS_PAGE
  163 boolean_t sf_buf_process_page(vm_page_t, void (*)(struct sf_buf *));
  164 #endif
  165 
  166 #else /* ! SFBUF */
  167 
  168 static inline struct sf_buf *
  169 sf_buf_alloc(struct vm_page *m, int pri)
  170 {
  171 
  172         return ((struct sf_buf *)m);
  173 }
  174 
  175 static inline void
  176 sf_buf_free(struct sf_buf *sf)
  177 {
  178 }
  179 
  180 static inline void
  181 sf_buf_ref(struct sf_buf *sf)
  182 {
  183 }
  184 #endif /* SFBUF */
  185 
  186 /*
  187  * Options to sf_buf_alloc() are specified through its flags argument.  This
  188  * argument's value should be the result of a bitwise or'ing of one or more
  189  * of the following values.
  190  */
  191 #define SFB_CATCH       1               /* Check signals if the allocation
  192                                            sleeps. */
  193 #define SFB_CPUPRIVATE  2               /* Create a CPU private mapping. */
  194 #define SFB_DEFAULT     0
  195 #define SFB_NOWAIT      4               /* Return NULL if all bufs are used. */
  196 
  197 extern counter_u64_t sfstat[sizeof(struct sfstat) / sizeof(uint64_t)];
  198 #define SFSTAT_ADD(name, val)   \
  199     counter_u64_add(sfstat[offsetof(struct sfstat, name) / sizeof(uint64_t)],\
  200         (val))
  201 #define SFSTAT_INC(name)        SFSTAT_ADD(name, 1)
  202 #endif /* _KERNEL */
  203 #endif /* !_SYS_SF_BUF_H_ */

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