204 lines
6.1 KiB
C
204 lines
6.1 KiB
C
/*-
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* Copyright (c) 2014 Gleb Smirnoff <glebius@FreeBSD.org>
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* Copyright (c) 2003-2004 Alan L. Cox <alc@cs.rice.edu>
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* 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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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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* $FreeBSD$
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*/
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#ifndef _SYS_SF_BUF_H_
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#define _SYS_SF_BUF_H_
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struct sfstat { /* sendfile statistics */
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uint64_t sf_syscalls; /* times sendfile was called */
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uint64_t sf_noiocnt; /* times sendfile didn't require I/O */
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uint64_t sf_iocnt; /* times sendfile had to do disk I/O */
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uint64_t sf_pages_read; /* pages read as part of a request */
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uint64_t sf_pages_valid; /* pages were valid for a request */
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uint64_t sf_rhpages_requested; /* readahead pages requested */
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uint64_t sf_rhpages_read; /* readahead pages read */
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uint64_t sf_busy; /* times aborted on a busy page */
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uint64_t sf_allocfail; /* times sfbuf allocation failed */
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uint64_t sf_allocwait; /* times sfbuf allocation had to wait */
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};
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#ifdef _KERNEL
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#include <sys/types.h>
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#include <sys/systm.h>
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#include <sys/counter.h>
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#include <vm/vm.h>
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#include <vm/vm_param.h>
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#include <vm/vm_page.h>
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/*
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* Sf_bufs, or sendfile(2) buffers provide a vm_page that is mapped
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* into kernel address space. Note, that they aren't used only
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* by sendfile(2)!
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*
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* Sf_bufs could be implemented as a feature of vm_page_t, but that
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* would require growth of the structure. That's why they are implemented
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* as a separate hash indexed by vm_page address. Implementation lives in
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* kern/subr_sfbuf.c. Meanwhile, most 64-bit machines have a physical map,
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* so they don't require this hash at all, thus ignore subr_sfbuf.c.
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*
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* Different 32-bit architectures demand different requirements on sf_buf
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* hash and functions. They request features in machine/vmparam.h, which
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* enable parts of this file. They can also optionally provide helpers in
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* machine/sf_buf.h
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*
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* Defines are:
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* SFBUF This machine requires sf_buf hash.
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* subr_sfbuf.c should be compiled.
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* SFBUF_CPUSET This machine can perform SFB_CPUPRIVATE mappings,
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* that do no invalidate cache on the rest of CPUs.
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* SFBUF_NOMD This machine doesn't have machine/sf_buf.h
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*
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* SFBUF_OPTIONAL_DIRECT_MAP Value of this define is used as boolean
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* variable that tells whether machine is
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* capable of direct map or not at runtime.
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* SFBUF_MAP This machine provides its own sf_buf_map() and
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* sf_buf_unmap().
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* SFBUF_PROCESS_PAGE This machine provides sf_buf_process_page()
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* function.
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*/
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#ifdef SFBUF
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#if defined(SMP) && defined(SFBUF_CPUSET)
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#include <sys/_cpuset.h>
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#endif
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#include <sys/queue.h>
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struct sf_buf {
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LIST_ENTRY(sf_buf) list_entry; /* list of buffers */
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TAILQ_ENTRY(sf_buf) free_entry; /* list of buffers */
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vm_page_t m; /* currently mapped page */
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vm_offset_t kva; /* va of mapping */
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int ref_count; /* usage of this mapping */
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#if defined(SMP) && defined(SFBUF_CPUSET)
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cpuset_t cpumask; /* where mapping is valid */
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#endif
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};
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#else /* ! SFBUF */
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struct sf_buf;
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#endif /* SFBUF */
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#ifndef SFBUF_NOMD
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#include <machine/sf_buf.h>
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#endif
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#ifdef SFBUF_OPTIONAL_DIRECT_MAP
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#include <machine/md_var.h>
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#endif
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#ifdef SFBUF
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struct sf_buf *sf_buf_alloc(struct vm_page *, int);
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void sf_buf_free(struct sf_buf *);
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void sf_buf_ref(struct sf_buf *);
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static inline vm_offset_t
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sf_buf_kva(struct sf_buf *sf)
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{
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#ifdef SFBUF_OPTIONAL_DIRECT_MAP
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if (SFBUF_OPTIONAL_DIRECT_MAP)
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return (SFBUF_PHYS_DMAP(VM_PAGE_TO_PHYS((vm_page_t)sf)));
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#endif
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return (sf->kva);
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}
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static inline vm_page_t
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sf_buf_page(struct sf_buf *sf)
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{
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#ifdef SFBUF_OPTIONAL_DIRECT_MAP
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if (SFBUF_OPTIONAL_DIRECT_MAP)
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return ((vm_page_t)sf);
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#endif
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return (sf->m);
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}
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#ifndef SFBUF_MAP
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#include <vm/pmap.h>
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static inline void
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sf_buf_map(struct sf_buf *sf, int flags)
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{
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pmap_qenter(sf->kva, &sf->m, 1);
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}
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static inline int
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sf_buf_unmap(struct sf_buf *sf)
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{
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return (0);
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}
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#endif /* SFBUF_MAP */
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#if defined(SMP) && defined(SFBUF_CPUSET)
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void sf_buf_shootdown(struct sf_buf *, int);
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#endif
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#ifdef SFBUF_PROCESS_PAGE
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boolean_t sf_buf_process_page(vm_page_t, void (*)(struct sf_buf *));
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#endif
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#else /* ! SFBUF */
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static inline struct sf_buf *
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sf_buf_alloc(struct vm_page *m, int pri)
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{
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return ((struct sf_buf *)m);
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}
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static inline void
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sf_buf_free(struct sf_buf *sf)
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{
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}
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static inline void
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sf_buf_ref(struct sf_buf *sf)
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{
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}
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#endif /* SFBUF */
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/*
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* Options to sf_buf_alloc() are specified through its flags argument. This
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* argument's value should be the result of a bitwise or'ing of one or more
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* of the following values.
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*/
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#define SFB_CATCH 1 /* Check signals if the allocation
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sleeps. */
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#define SFB_CPUPRIVATE 2 /* Create a CPU private mapping. */
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#define SFB_DEFAULT 0
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#define SFB_NOWAIT 4 /* Return NULL if all bufs are used. */
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extern counter_u64_t sfstat[sizeof(struct sfstat) / sizeof(uint64_t)];
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#define SFSTAT_ADD(name, val) \
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counter_u64_add(sfstat[offsetof(struct sfstat, name) / sizeof(uint64_t)],\
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(val))
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#define SFSTAT_INC(name) SFSTAT_ADD(name, 1)
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#endif /* _KERNEL */
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#endif /* !_SYS_SF_BUF_H_ */
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