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98cb733c67
MAKEDEV: Add MAKEDEV glue for the ti(4) device nodes.
ti.4: Update the ti(4) man page to include information on the
TI_JUMBO_HDRSPLIT and TI_PRIVATE_JUMBOS kernel options,
and also include information about the new character
device interface and the associated ioctls.
man9/Makefile: Add jumbo.9 and zero_copy.9 man pages and associated
links.
jumbo.9: New man page describing the jumbo buffer allocator
interface and operation.
zero_copy.9: New man page describing the general characteristics of
the zero copy send and receive code, and what an
application author should do to take advantage of the
zero copy functionality.
NOTES: Add entries for ZERO_COPY_SOCKETS, TI_PRIVATE_JUMBOS,
TI_JUMBO_HDRSPLIT, MSIZE, and MCLSHIFT.
conf/files: Add uipc_jumbo.c and uipc_cow.c.
conf/options: Add the 5 options mentioned above.
kern_subr.c: Receive side zero copy implementation. This takes
"disposable" pages attached to an mbuf, gives them to
a user process, and then recycles the user's page.
This is only active when ZERO_COPY_SOCKETS is turned on
and the kern.ipc.zero_copy.receive sysctl variable is
set to 1.
uipc_cow.c: Send side zero copy functions. Takes a page written
by the user and maps it copy on write and assigns it
kernel virtual address space. Removes copy on write
mapping once the buffer has been freed by the network
stack.
uipc_jumbo.c: Jumbo disposable page allocator code. This allocates
(optionally) disposable pages for network drivers that
want to give the user the option of doing zero copy
receive.
uipc_socket.c: Add kern.ipc.zero_copy.{send,receive} sysctls that are
enabled if ZERO_COPY_SOCKETS is turned on.
Add zero copy send support to sosend() -- pages get
mapped into the kernel instead of getting copied if
they meet size and alignment restrictions.
uipc_syscalls.c:Un-staticize some of the sf* functions so that they
can be used elsewhere. (uipc_cow.c)
if_media.c: In the SIOCGIFMEDIA ioctl in ifmedia_ioctl(), avoid
calling malloc() with M_WAITOK. Return an error if
the M_NOWAIT malloc fails.
The ti(4) driver and the wi(4) driver, at least, call
this with a mutex held. This causes witness warnings
for 'ifconfig -a' with a wi(4) or ti(4) board in the
system. (I've only verified for ti(4)).
ip_output.c: Fragment large datagrams so that each segment contains
a multiple of PAGE_SIZE amount of data plus headers.
This allows the receiver to potentially do page
flipping on receives.
if_ti.c: Add zero copy receive support to the ti(4) driver. If
TI_PRIVATE_JUMBOS is not defined, it now uses the
jumbo(9) buffer allocator for jumbo receive buffers.
Add a new character device interface for the ti(4)
driver for the new debugging interface. This allows
(a patched version of) gdb to talk to the Tigon board
and debug the firmware. There are also a few additional
debugging ioctls available through this interface.
Add header splitting support to the ti(4) driver.
Tweak some of the default interrupt coalescing
parameters to more useful defaults.
Add hooks for supporting transmit flow control, but
leave it turned off with a comment describing why it
is turned off.
if_tireg.h: Change the firmware rev to 12.4.11, since we're really
at 12.4.11 plus fixes from 12.4.13.
Add defines needed for debugging.
Remove the ti_stats structure, it is now defined in
sys/tiio.h.
ti_fw.h: 12.4.11 firmware.
ti_fw2.h: 12.4.11 firmware, plus selected fixes from 12.4.13,
and my header splitting patches. Revision 12.4.13
doesn't handle 10/100 negotiation properly. (This
firmware is the same as what was in the tree previously,
with the addition of header splitting support.)
sys/jumbo.h: Jumbo buffer allocator interface.
sys/mbuf.h: Add a new external mbuf type, EXT_DISPOSABLE, to
indicate that the payload buffer can be thrown away /
flipped to a userland process.
socketvar.h: Add prototype for socow_setup.
tiio.h: ioctl interface to the character portion of the ti(4)
driver, plus associated structure/type definitions.
uio.h: Change prototype for uiomoveco() so that we'll know
whether the source page is disposable.
ufs_readwrite.c:Update for new prototype of uiomoveco().
vm_fault.c: In vm_fault(), check to see whether we need to do a page
based copy on write fault.
vm_object.c: Add a new function, vm_object_allocate_wait(). This
does the same thing that vm_object allocate does, except
that it gives the caller the opportunity to specify whether
it should wait on the uma_zalloc() of the object structre.
This allows vm objects to be allocated while holding a
mutex. (Without generating WITNESS warnings.)
vm_object_allocate() is implemented as a call to
vm_object_allocate_wait() with the malloc flag set to
M_WAITOK.
vm_object.h: Add prototype for vm_object_allocate_wait().
vm_page.c: Add page-based copy on write setup, clear and fault
routines.
vm_page.h: Add page based COW function prototypes and variable in
the vm_page structure.
Many thanks to Drew Gallatin, who wrote the zero copy send and receive
code, and to all the other folks who have tested and reviewed this code
over the years.
373 lines
13 KiB
C
373 lines
13 KiB
C
/*
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* Copyright (c) 1991, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* The Mach Operating System project at Carnegie-Mellon University.
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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. 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, Berkeley and its contributors.
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* 4. 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: @(#)vm_page.h 8.2 (Berkeley) 12/13/93
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*
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*
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* Copyright (c) 1987, 1990 Carnegie-Mellon University.
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* All rights reserved.
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*
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* Authors: Avadis Tevanian, Jr., Michael Wayne Young
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*
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* Permission to use, copy, modify and distribute this software and
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* its documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation.
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*
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* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
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* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
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* FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
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*
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* Carnegie Mellon requests users of this software to return to
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*
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* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
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* School of Computer Science
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* Carnegie Mellon University
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* Pittsburgh PA 15213-3890
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*
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* any improvements or extensions that they make and grant Carnegie the
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* rights to redistribute these changes.
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*
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* $FreeBSD$
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*/
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/*
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* Resident memory system definitions.
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*/
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#ifndef _VM_PAGE_
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#define _VM_PAGE_
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#if !defined(KLD_MODULE)
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#include "opt_vmpage.h"
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#endif
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#include <vm/pmap.h>
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/*
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* Management of resident (logical) pages.
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*
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* A small structure is kept for each resident
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* page, indexed by page number. Each structure
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* is an element of several lists:
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*
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* A hash table bucket used to quickly
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* perform object/offset lookups
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*
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* A list of all pages for a given object,
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* so they can be quickly deactivated at
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* time of deallocation.
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*
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* An ordered list of pages due for pageout.
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*
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* In addition, the structure contains the object
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* and offset to which this page belongs (for pageout),
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* and sundry status bits.
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*
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* Fields in this structure are locked either by the lock on the
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* object that the page belongs to (O) or by the lock on the page
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* queues (P).
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*
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* The 'valid' and 'dirty' fields are distinct. A page may have dirty
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* bits set without having associated valid bits set. This is used by
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* NFS to implement piecemeal writes.
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*/
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TAILQ_HEAD(pglist, vm_page);
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struct vm_page {
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TAILQ_ENTRY(vm_page) pageq; /* queue info for FIFO queue or free list (P) */
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struct vm_page *hnext; /* hash table link (O,P) */
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TAILQ_ENTRY(vm_page) listq; /* pages in same object (O) */
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vm_object_t object; /* which object am I in (O,P)*/
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vm_pindex_t pindex; /* offset into object (O,P) */
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vm_offset_t phys_addr; /* physical address of page */
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struct md_page md; /* machine dependant stuff */
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u_short queue; /* page queue index */
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u_short flags, /* see below */
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pc; /* page color */
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u_short wire_count; /* wired down maps refs (P) */
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short hold_count; /* page hold count */
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u_char act_count; /* page usage count */
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u_char busy; /* page busy count */
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/* NOTE that these must support one bit per DEV_BSIZE in a page!!! */
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/* so, on normal X86 kernels, they must be at least 8 bits wide */
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#if PAGE_SIZE == 4096
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u_char valid; /* map of valid DEV_BSIZE chunks */
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u_char dirty; /* map of dirty DEV_BSIZE chunks */
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#elif PAGE_SIZE == 8192
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u_short valid; /* map of valid DEV_BSIZE chunks */
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u_short dirty; /* map of dirty DEV_BSIZE chunks */
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#endif
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u_int cow; /* page cow mapping count */
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};
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/*
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* note: currently use SWAPBLK_NONE as an absolute value rather then
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* a flag bit.
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*/
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#define SWAPBLK_MASK ((daddr_t)((u_daddr_t)-1 >> 1)) /* mask */
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#define SWAPBLK_NONE ((daddr_t)((u_daddr_t)SWAPBLK_MASK + 1))/* flag */
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#if !defined(KLD_MODULE)
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/*
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* Page coloring parameters
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*/
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/* Each of PQ_FREE, and PQ_CACHE have PQ_HASH_SIZE entries */
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/* Backward compatibility for existing PQ_*CACHE config options. */
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#if !defined(PQ_CACHESIZE)
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#if defined(PQ_HUGECACHE)
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#define PQ_CACHESIZE 1024
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#elif defined(PQ_LARGECACHE)
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#define PQ_CACHESIZE 512
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#elif defined(PQ_MEDIUMCACHE)
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#define PQ_CACHESIZE 256
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#elif defined(PQ_NORMALCACHE)
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#define PQ_CACHESIZE 64
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#elif defined(PQ_NOOPT)
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#define PQ_CACHESIZE 0
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#else
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#define PQ_CACHESIZE 128
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#endif
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#endif /* !defined(PQ_CACHESIZE) */
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#if PQ_CACHESIZE >= 1024
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#define PQ_PRIME1 31 /* Prime number somewhat less than PQ_HASH_SIZE */
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#define PQ_PRIME2 23 /* Prime number somewhat less than PQ_HASH_SIZE */
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#define PQ_L2_SIZE 256 /* A number of colors opt for 1M cache */
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#elif PQ_CACHESIZE >= 512
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#define PQ_PRIME1 31 /* Prime number somewhat less than PQ_HASH_SIZE */
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#define PQ_PRIME2 23 /* Prime number somewhat less than PQ_HASH_SIZE */
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#define PQ_L2_SIZE 128 /* A number of colors opt for 512K cache */
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#elif PQ_CACHESIZE >= 256
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#define PQ_PRIME1 13 /* Prime number somewhat less than PQ_HASH_SIZE */
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#define PQ_PRIME2 7 /* Prime number somewhat less than PQ_HASH_SIZE */
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#define PQ_L2_SIZE 64 /* A number of colors opt for 256K cache */
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#elif PQ_CACHESIZE >= 128
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#define PQ_PRIME1 9 /* Produces a good PQ_L2_SIZE/3 + PQ_PRIME1 */
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#define PQ_PRIME2 5 /* Prime number somewhat less than PQ_HASH_SIZE */
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#define PQ_L2_SIZE 32 /* A number of colors opt for 128k cache */
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#elif PQ_CACHESIZE >= 64
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#define PQ_PRIME1 5 /* Prime number somewhat less than PQ_HASH_SIZE */
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#define PQ_PRIME2 3 /* Prime number somewhat less than PQ_HASH_SIZE */
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#define PQ_L2_SIZE 16 /* A reasonable number of colors (opt for 64K cache) */
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#else
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#define PQ_PRIME1 1 /* Disable page coloring. */
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#define PQ_PRIME2 1
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#define PQ_L2_SIZE 1
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#endif
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#define PQ_L2_MASK (PQ_L2_SIZE - 1)
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#define PQ_NONE 0
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#define PQ_FREE 1
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#define PQ_INACTIVE (1 + 1*PQ_L2_SIZE)
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#define PQ_ACTIVE (2 + 1*PQ_L2_SIZE)
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#define PQ_CACHE (3 + 1*PQ_L2_SIZE)
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#define PQ_HOLD (3 + 2*PQ_L2_SIZE)
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#define PQ_COUNT (4 + 2*PQ_L2_SIZE)
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struct vpgqueues {
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struct pglist pl;
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int *cnt;
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int lcnt;
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};
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extern struct vpgqueues vm_page_queues[PQ_COUNT];
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#endif /* !defined(KLD_MODULE) */
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/*
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* These are the flags defined for vm_page.
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*
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* Note: PG_FILLED and PG_DIRTY are added for the filesystems.
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*
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* Note: PG_UNMANAGED (used by OBJT_PHYS) indicates that the page is
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* not under PV management but otherwise should be treated as a
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* normal page. Pages not under PV management cannot be paged out
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* via the object/vm_page_t because there is no knowledge of their
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* pte mappings, nor can they be removed from their objects via
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* the object, and such pages are also not on any PQ queue.
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*/
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#define PG_BUSY 0x0001 /* page is in transit (O) */
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#define PG_WANTED 0x0002 /* someone is waiting for page (O) */
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#define PG_WINATCFLS 0x0004 /* flush dirty page on inactive q */
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#define PG_FICTITIOUS 0x0008 /* physical page doesn't exist (O) */
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#define PG_WRITEABLE 0x0010 /* page is mapped writeable */
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#define PG_MAPPED 0x0020 /* page is mapped */
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#define PG_ZERO 0x0040 /* page is zeroed */
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#define PG_REFERENCED 0x0080 /* page has been referenced */
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#define PG_CLEANCHK 0x0100 /* page will be checked for cleaning */
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#define PG_SWAPINPROG 0x0200 /* swap I/O in progress on page */
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#define PG_NOSYNC 0x0400 /* do not collect for syncer */
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#define PG_UNMANAGED 0x0800 /* No PV management for page */
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#define PG_MARKER 0x1000 /* special queue marker page */
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/*
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* Misc constants.
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*/
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#define ACT_DECLINE 1
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#define ACT_ADVANCE 3
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#define ACT_INIT 5
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#define ACT_MAX 64
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#define PFCLUSTER_BEHIND 3
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#define PFCLUSTER_AHEAD 3
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#ifdef _KERNEL
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/*
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* Each pageable resident page falls into one of four lists:
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*
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* free
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* Available for allocation now.
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*
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* The following are all LRU sorted:
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*
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* cache
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* Almost available for allocation. Still in an
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* object, but clean and immediately freeable at
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* non-interrupt times.
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*
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* inactive
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* Low activity, candidates for reclamation.
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* This is the list of pages that should be
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* paged out next.
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*
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* active
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* Pages that are "active" i.e. they have been
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* recently referenced.
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*
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* zero
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* Pages that are really free and have been pre-zeroed
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*
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*/
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extern int vm_page_zero_count;
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extern vm_page_t vm_page_array; /* First resident page in table */
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extern int vm_page_array_size; /* number of vm_page_t's */
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extern long first_page; /* first physical page number */
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#define VM_PAGE_TO_PHYS(entry) ((entry)->phys_addr)
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#define PHYS_TO_VM_PAGE(pa) \
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(&vm_page_array[atop(pa) - first_page ])
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#if PAGE_SIZE == 4096
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#define VM_PAGE_BITS_ALL 0xff
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#endif
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#if PAGE_SIZE == 8192
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#define VM_PAGE_BITS_ALL 0xffff
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#endif
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#define VM_ALLOC_NORMAL 0
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#define VM_ALLOC_INTERRUPT 1
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#define VM_ALLOC_SYSTEM 2
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#define VM_ALLOC_ZERO 0x40
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#define VM_ALLOC_RETRY 0x80
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void vm_page_flag_set(vm_page_t m, unsigned short bits);
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void vm_page_flag_clear(vm_page_t m, unsigned short bits);
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void vm_page_busy(vm_page_t m);
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void vm_page_flash(vm_page_t m);
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void vm_page_io_start(vm_page_t m);
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void vm_page_io_finish(vm_page_t m);
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void vm_page_hold(vm_page_t mem);
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void vm_page_unhold(vm_page_t mem);
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void vm_page_protect(vm_page_t mem, int prot);
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boolean_t vm_page_zero_fill(vm_page_t m);
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boolean_t vm_page_zero_fill_area(vm_page_t m, int off, int len);
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void vm_page_copy(vm_page_t src_m, vm_page_t dest_m);
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void vm_page_free(vm_page_t m);
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void vm_page_free_zero(vm_page_t m);
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int vm_page_sleep_busy(vm_page_t m, int also_m_busy, const char *msg);
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void vm_page_dirty(vm_page_t m);
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void vm_page_undirty(vm_page_t m);
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void vm_page_wakeup(vm_page_t m);
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void vm_pageq_init(void);
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struct vpgqueues *vm_pageq_aquire(int queue);
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void vm_pageq_release(struct vpgqueues *vpq);
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vm_page_t vm_pageq_add_new_page(vm_offset_t pa);
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void vm_pageq_enqueue(int queue, vm_page_t m);
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void vm_pageq_remove_nowakeup(vm_page_t m);
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void vm_pageq_remove(vm_page_t m);
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vm_page_t vm_pageq_find(int basequeue, int index, boolean_t prefer_zero);
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void vm_pageq_requeue(vm_page_t m);
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void vm_page_activate (vm_page_t);
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vm_page_t vm_page_alloc (vm_object_t, vm_pindex_t, int);
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vm_page_t vm_page_grab (vm_object_t, vm_pindex_t, int);
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void vm_page_cache (register vm_page_t);
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int vm_page_try_to_cache (vm_page_t);
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int vm_page_try_to_free (vm_page_t);
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void vm_page_dontneed (register vm_page_t);
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void vm_page_deactivate (vm_page_t);
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void vm_page_insert (vm_page_t, vm_object_t, vm_pindex_t);
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vm_page_t vm_page_lookup (vm_object_t, vm_pindex_t);
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void vm_page_remove (vm_page_t);
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void vm_page_rename (vm_page_t, vm_object_t, vm_pindex_t);
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vm_offset_t vm_page_startup (vm_offset_t, vm_offset_t, vm_offset_t);
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void vm_page_unmanage (vm_page_t);
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void vm_page_unwire (vm_page_t, int);
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void vm_page_wire (vm_page_t);
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void vm_page_set_validclean (vm_page_t, int, int);
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void vm_page_set_dirty (vm_page_t, int, int);
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void vm_page_clear_dirty (vm_page_t, int, int);
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void vm_page_set_invalid (vm_page_t, int, int);
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int vm_page_is_valid (vm_page_t, int, int);
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void vm_page_test_dirty (vm_page_t);
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int vm_page_bits (int, int);
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void vm_page_zero_invalid(vm_page_t m, boolean_t setvalid);
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void vm_page_free_toq(vm_page_t m);
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void vm_page_zero_idle_wakeup(void);
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void vm_page_cowfault (vm_page_t);
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void vm_page_cowsetup (vm_page_t);
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void vm_page_cowclear (vm_page_t);
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#endif /* _KERNEL */
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#endif /* !_VM_PAGE_ */
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