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提交 f541ae32 编写于 作者: I Ingo Molnar
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Merge branch 'linus' into perfcounters/core-v2 

Merge reason: we have gathered quite a few conflicts, need to merge upstream

Conflicts:
	arch/powerpc/kernel/Makefile
	arch/x86/ia32/ia32entry.S
	arch/x86/include/asm/hardirq.h
	arch/x86/include/asm/unistd_32.h
	arch/x86/include/asm/unistd_64.h
	arch/x86/kernel/cpu/common.c
	arch/x86/kernel/irq.c
	arch/x86/kernel/syscall_table_32.S
	arch/x86/mm/iomap_32.c
	include/linux/sched.h
	kernel/Makefile
Signed-off-by: NIngo Molnar <mingo@elte.hu>
上级 e2553577 0221c81b
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文本差异 电子邮件补丁
CREDITS
浏览文件 @ f541ae32
......@@ -495,6 +495,11 @@ S: Kopmansg 2
S: 411 13 Goteborg
S: Sweden
N: Paul Bristow
E: paul@paulbristow.net
W: http://paulbristow.net/linux/idefloppy.html
D: Maintainer of IDE/ATAPI floppy driver
N: Dominik Brodowski
E: linux@brodo.de
W: http://www.brodo.de/
......@@ -1407,8 +1412,8 @@ P: 1024D/77D4FC9B F5C5 1C20 1DFC DEC3 3107 54A4 2332 ADFC 77D4 FC9B
D: National Language Support
D: Linux Internationalization Project
D: German Localization for Linux and GNU software
S: Kriemhildring 12a
S: 65795 Hattersheim am Main
S: Auf der Fittel 18
S: 53347 Alfter
S: Germany
N: Christoph Hellwig
......@@ -2642,6 +2647,10 @@ S: C/ Mieses 20, 9-B
S: Valladolid 47009
S: Spain
N: Gadi Oxman
E: gadio@netvision.net.il
D: Original author and maintainer of IDE/ATAPI floppy/tape drivers
N: Greg Page
E: gpage@sovereign.org
D: IPX development and support
......@@ -3571,6 +3580,12 @@ N: Dirk Verworner
D: Co-author of German book ``Linux-Kernel-Programmierung''
D: Co-founder of Berlin Linux User Group
N: Riku Voipio
E: riku.voipio@iki.fi
D: Author of PCA9532 LED and Fintek f75375s hwmon driver
D: Some random ARM board patches
S: Finland
N: Patrick Volkerding
E: volkerdi@ftp.cdrom.com
D: Produced the Slackware distribution, updated the SVGAlib
......@@ -3738,7 +3753,7 @@ S: 93149 Nittenau
S: Germany
N: Gertjan van Wingerde
E: gwingerde@home.nl
E: gwingerde@gmail.com
D: Ralink rt2x00 WLAN driver
D: Minix V2 file-system
D: Misc fixes
......
Documentation/00-INDEX
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......@@ -86,6 +86,8 @@ cachetlb.txt
- describes the cache/TLB flushing interfaces Linux uses.
cdrom/
- directory with information on the CD-ROM drivers that Linux has.
cgroups/
- cgroups features, including cpusets and memory controller.
connector/
- docs on the netlink based userspace<->kernel space communication mod.
console/
......@@ -98,8 +100,6 @@ cpu-load.txt
- document describing how CPU load statistics are collected.
cpuidle/
- info on CPU_IDLE, CPU idle state management subsystem.
cpusets.txt
- documents the cpusets feature; assign CPUs and Mem to a set of tasks.
cputopology.txt
- documentation on how CPU topology info is exported via sysfs.
cris/
......
Documentation/ABI/testing/debugfs-kmemtrace 0 → 100644
浏览文件 @ f541ae32
What: /sys/kernel/debug/kmemtrace/
Date: July 2008
Contact: Eduard - Gabriel Munteanu <eduard.munteanu@linux360.ro>
Description:
In kmemtrace-enabled kernels, the following files are created:
/sys/kernel/debug/kmemtrace/
cpu<n> (0400) Per-CPU tracing data, see below. (binary)
total_overruns (0400) Total number of bytes which were dropped from
cpu<n> files because of full buffer condition,
non-binary. (text)
abi_version (0400) Kernel's kmemtrace ABI version. (text)
Each per-CPU file should be read according to the relay interface. That is,
the reader should set affinity to that specific CPU and, as currently done by
the userspace application (though there are other methods), use poll() with
an infinite timeout before every read(). Otherwise, erroneous data may be
read. The binary data has the following _core_ format:
Event ID (1 byte) Unsigned integer, one of:
0 - represents an allocation (KMEMTRACE_EVENT_ALLOC)
1 - represents a freeing of previously allocated memory
(KMEMTRACE_EVENT_FREE)
Type ID (1 byte) Unsigned integer, one of:
0 - this is a kmalloc() / kfree()
1 - this is a kmem_cache_alloc() / kmem_cache_free()
2 - this is a __get_free_pages() et al.
Event size (2 bytes) Unsigned integer representing the
size of this event. Used to extend
kmemtrace. Discard the bytes you
don't know about.
Sequence number (4 bytes) Signed integer used to reorder data
logged on SMP machines. Wraparound
must be taken into account, although
it is unlikely.
Caller address (8 bytes) Return address to the caller.
Pointer to mem (8 bytes) Pointer to target memory area. Can be
NULL, but not all such calls might be
recorded.
In case of KMEMTRACE_EVENT_ALLOC events, the next fields follow:
Requested bytes (8 bytes) Total number of requested bytes,
unsigned, must not be zero.
Allocated bytes (8 bytes) Total number of actually allocated
bytes, unsigned, must not be lower
than requested bytes.
Requested flags (4 bytes) GFP flags supplied by the caller.
Target CPU (4 bytes) Signed integer, valid for event id 1.
If equal to -1, target CPU is the same
as origin CPU, but the reverse might
not be true.
The data is made available in the same endianness the machine has.
Other event ids and type ids may be defined and added. Other fields may be
added by increasing event size, but see below for details.
Every modification to the ABI, including new id definitions, are followed
by bumping the ABI version by one.
Adding new data to the packet (features) is done at the end of the mandatory
data:
Feature size (2 byte)
Feature ID (1 byte)
Feature data (Feature size - 3 bytes)
Users:
kmemtrace-user - git://repo.or.cz/kmemtrace-user.git
Documentation/ABI/testing/ima_policy 0 → 100644
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What: security/ima/policy
Date: May 2008
Contact: Mimi Zohar <zohar@us.ibm.com>
Description:
The Trusted Computing Group(TCG) runtime Integrity
Measurement Architecture(IMA) maintains a list of hash
values of executables and other sensitive system files
loaded into the run-time of this system. At runtime,
the policy can be constrained based on LSM specific data.
Policies are loaded into the securityfs file ima/policy
by opening the file, writing the rules one at a time and
then closing the file. The new policy takes effect after
the file ima/policy is closed.
rule format: action [condition ...]
action: measure | dont_measure
condition:= base | lsm
base: [[func=] [mask=] [fsmagic=] [uid=]]
lsm: [[subj_user=] [subj_role=] [subj_type=]
[obj_user=] [obj_role=] [obj_type=]]
base: func:= [BPRM_CHECK][FILE_MMAP][INODE_PERMISSION]
mask:= [MAY_READ] [MAY_WRITE] [MAY_APPEND] [MAY_EXEC]
fsmagic:= hex value
uid:= decimal value
lsm: are LSM specific
default policy:
# PROC_SUPER_MAGIC
dont_measure fsmagic=0x9fa0
# SYSFS_MAGIC
dont_measure fsmagic=0x62656572
# DEBUGFS_MAGIC
dont_measure fsmagic=0x64626720
# TMPFS_MAGIC
dont_measure fsmagic=0x01021994
# SECURITYFS_MAGIC
dont_measure fsmagic=0x73636673
measure func=BPRM_CHECK
measure func=FILE_MMAP mask=MAY_EXEC
measure func=INODE_PERM mask=MAY_READ uid=0
The default policy measures all executables in bprm_check,
all files mmapped executable in file_mmap, and all files
open for read by root in inode_permission.
Examples of LSM specific definitions:
SELinux:
# SELINUX_MAGIC
dont_measure fsmagic=0xF97CFF8C
dont_measure obj_type=var_log_t
dont_measure obj_type=auditd_log_t
measure subj_user=system_u func=INODE_PERM mask=MAY_READ
measure subj_role=system_r func=INODE_PERM mask=MAY_READ
Smack:
measure subj_user=_ func=INODE_PERM mask=MAY_READ
Documentation/ABI/testing/sysfs-bus-pci
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......@@ -41,6 +41,49 @@ Description:
for the device and attempt to bind to it. For example:
# echo "8086 10f5" > /sys/bus/pci/drivers/foo/new_id
What: /sys/bus/pci/drivers/.../remove_id
Date: February 2009
Contact: Chris Wright <chrisw@sous-sol.org>
Description:
Writing a device ID to this file will remove an ID
that was dynamically added via the new_id sysfs entry.
The format for the device ID is:
VVVV DDDD SVVV SDDD CCCC MMMM. That is Vendor ID, Device
ID, Subsystem Vendor ID, Subsystem Device ID, Class,
and Class Mask. The Vendor ID and Device ID fields are
required, the rest are optional. After successfully
removing an ID, the driver will no longer support the
device. This is useful to ensure auto probing won't
match the driver to the device. For example:
# echo "8086 10f5" > /sys/bus/pci/drivers/foo/remove_id
What: /sys/bus/pci/rescan
Date: January 2009
Contact: Linux PCI developers <linux-pci@vger.kernel.org>
Description:
Writing a non-zero value to this attribute will
force a rescan of all PCI buses in the system, and
re-discover previously removed devices.
Depends on CONFIG_HOTPLUG.
What: /sys/bus/pci/devices/.../remove
Date: January 2009
Contact: Linux PCI developers <linux-pci@vger.kernel.org>
Description:
Writing a non-zero value to this attribute will
hot-remove the PCI device and any of its children.
Depends on CONFIG_HOTPLUG.
What: /sys/bus/pci/devices/.../rescan
Date: January 2009
Contact: Linux PCI developers <linux-pci@vger.kernel.org>
Description:
Writing a non-zero value to this attribute will
force a rescan of the device's parent bus and all
child buses, and re-discover devices removed earlier
from this part of the device tree.
Depends on CONFIG_HOTPLUG.
What: /sys/bus/pci/devices/.../vpd
Date: February 2008
Contact: Ben Hutchings <bhutchings@solarflare.com>
......@@ -52,3 +95,30 @@ Description:
that some devices may have malformatted data. If the
underlying VPD has a writable section then the
corresponding section of this file will be writable.
What: /sys/bus/pci/devices/.../virtfnN
Date: March 2009
Contact: Yu Zhao <yu.zhao@intel.com>
Description:
This symbolic link appears when hardware supports the SR-IOV
capability and the Physical Function driver has enabled it.
The symbolic link points to the PCI device sysfs entry of the
Virtual Function whose index is N (0...MaxVFs-1).
What: /sys/bus/pci/devices/.../dep_link
Date: March 2009
Contact: Yu Zhao <yu.zhao@intel.com>
Description:
This symbolic link appears when hardware supports the SR-IOV
capability and the Physical Function driver has enabled it,
and this device has vendor specific dependencies with others.
The symbolic link points to the PCI device sysfs entry of
Physical Function this device depends on.
What: /sys/bus/pci/devices/.../physfn
Date: March 2009
Contact: Yu Zhao <yu.zhao@intel.com>
Description:
This symbolic link appears when a device is a Virtual Function.
The symbolic link points to the PCI device sysfs entry of the
Physical Function this device associates with.
Documentation/ABI/testing/sysfs-class-regulator
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......@@ -4,8 +4,8 @@ KernelVersion: 2.6.26
Contact: Liam Girdwood <lrg@slimlogic.co.uk>
Description:
Some regulator directories will contain a field called
state. This reports the regulator enable status, for
regulators which can report that value.
state. This reports the regulator enable control, for
regulators which can report that input value.
This will be one of the following strings:
......@@ -14,16 +14,54 @@ Description:
'unknown'
'enabled' means the regulator output is ON and is supplying
power to the system.
power to the system (assuming no error prevents it).
'disabled' means the regulator output is OFF and is not
supplying power to the system..
supplying power to the system (unless some non-Linux
control has enabled it).
'unknown' means software cannot determine the state, or
the reported state is invalid.
NOTE: this field can be used in conjunction with microvolts
and microamps to determine regulator output levels.
or microamps to determine configured regulator output levels.
What: /sys/class/regulator/.../status
Description:
Some regulator directories will contain a field called
"status". This reports the current regulator status, for
regulators which can report that output value.
This will be one of the following strings:
off
on
error
fast
normal
idle
standby
"off" means the regulator is not supplying power to the
system.
"on" means the regulator is supplying power to the system,
and the regulator can't report a detailed operation mode.
"error" indicates an out-of-regulation status such as being
disabled due to thermal shutdown, or voltage being unstable
because of problems with the input power supply.
"fast", "normal", "idle", and "standby" are all detailed
regulator operation modes (described elsewhere). They
imply "on", but provide more detail.
Note that regulator status is a function of many inputs,
not limited to control inputs from Linux. For example,
the actual load presented may trigger "error" status; or
a regulator may be enabled by another user, even though
Linux did not enable it.
What: /sys/class/regulator/.../type
......@@ -58,7 +96,7 @@ Description:
Some regulator directories will contain a field called
microvolts. This holds the regulator output voltage setting
measured in microvolts (i.e. E-6 Volts), for regulators
which can report that voltage.
which can report the control input for voltage.
NOTE: This value should not be used to determine the regulator
output voltage level as this value is the same regardless of
......@@ -73,7 +111,7 @@ Description:
Some regulator directories will contain a field called
microamps. This holds the regulator output current limit
setting measured in microamps (i.e. E-6 Amps), for regulators
which can report that current.
which can report the control input for a current limit.
NOTE: This value should not be used to determine the regulator
output current level as this value is the same regardless of
......@@ -87,7 +125,7 @@ Contact: Liam Girdwood <lrg@slimlogic.co.uk>
Description:
Some regulator directories will contain a field called
opmode. This holds the current regulator operating mode,
for regulators which can report it.
for regulators which can report that control input value.
The opmode value can be one of the following strings:
......@@ -101,7 +139,8 @@ Description:
NOTE: This value should not be used to determine the regulator
output operating mode as this value is the same regardless of
whether the regulator is enabled or disabled.
whether the regulator is enabled or disabled. A "status"
attribute may be available to determine the actual mode.
What: /sys/class/regulator/.../min_microvolts
......
Documentation/ABI/testing/sysfs-fs-ext4 0 → 100644
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What: /sys/fs/ext4/<disk>/mb_stats
Date: March 2008
Contact: "Theodore Ts'o" <tytso@mit.edu>
Description:
Controls whether the multiblock allocator should
collect statistics, which are shown during the unmount.
1 means to collect statistics, 0 means not to collect
statistics
What: /sys/fs/ext4/<disk>/mb_group_prealloc
Date: March 2008
Contact: "Theodore Ts'o" <tytso@mit.edu>
Description:
The multiblock allocator will round up allocation
requests to a multiple of this tuning parameter if the
stripe size is not set in the ext4 superblock
What: /sys/fs/ext4/<disk>/mb_max_to_scan
Date: March 2008
Contact: "Theodore Ts'o" <tytso@mit.edu>
Description:
The maximum number of extents the multiblock allocator
will search to find the best extent
What: /sys/fs/ext4/<disk>/mb_min_to_scan
Date: March 2008
Contact: "Theodore Ts'o" <tytso@mit.edu>
Description:
The minimum number of extents the multiblock allocator
will search to find the best extent
What: /sys/fs/ext4/<disk>/mb_order2_req
Date: March 2008
Contact: "Theodore Ts'o" <tytso@mit.edu>
Description:
Tuning parameter which controls the minimum size for
requests (as a power of 2) where the buddy cache is
used
What: /sys/fs/ext4/<disk>/mb_stream_req
Date: March 2008
Contact: "Theodore Ts'o" <tytso@mit.edu>
Description:
Files which have fewer blocks than this tunable
parameter will have their blocks allocated out of a
block group specific preallocation pool, so that small
files are packed closely together. Each large file
will have its blocks allocated out of its own unique
preallocation pool.
What: /sys/fs/ext4/<disk>/inode_readahead
Date: March 2008
Contact: "Theodore Ts'o" <tytso@mit.edu>
Description:
Tuning parameter which controls the maximum number of
inode table blocks that ext4's inode table readahead
algorithm will pre-read into the buffer cache
What: /sys/fs/ext4/<disk>/delayed_allocation_blocks
Date: March 2008
Contact: "Theodore Ts'o" <tytso@mit.edu>
Description:
This file is read-only and shows the number of blocks
that are dirty in the page cache, but which do not
have their location in the filesystem allocated yet.
What: /sys/fs/ext4/<disk>/lifetime_write_kbytes
Date: March 2008
Contact: "Theodore Ts'o" <tytso@mit.edu>
Description:
This file is read-only and shows the number of kilobytes
of data that have been written to this filesystem since it was
created.
What: /sys/fs/ext4/<disk>/session_write_kbytes
Date: March 2008
Contact: "Theodore Ts'o" <tytso@mit.edu>
Description:
This file is read-only and shows the number of
kilobytes of data that have been written to this
filesystem since it was mounted.
Documentation/DMA-API.txt
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......@@ -609,3 +609,109 @@ size is the size (and should be a page-sized multiple).
The return value will be either a pointer to the processor virtual
address of the memory, or an error (via PTR_ERR()) if any part of the
region is occupied.
Part III - Debug drivers use of the DMA-API
-------------------------------------------
The DMA-API as described above as some constraints. DMA addresses must be
released with the corresponding function with the same size for example. With
the advent of hardware IOMMUs it becomes more and more important that drivers
do not violate those constraints. In the worst case such a violation can
result in data corruption up to destroyed filesystems.
To debug drivers and find bugs in the usage of the DMA-API checking code can
be compiled into the kernel which will tell the developer about those
violations. If your architecture supports it you can select the "Enable
debugging of DMA-API usage" option in your kernel configuration. Enabling this
option has a performance impact. Do not enable it in production kernels.
If you boot the resulting kernel will contain code which does some bookkeeping
about what DMA memory was allocated for which device. If this code detects an
error it prints a warning message with some details into your kernel log. An
example warning message may look like this:
------------[ cut here ]------------
WARNING: at /data2/repos/linux-2.6-iommu/lib/dma-debug.c:448
check_unmap+0x203/0x490()
Hardware name:
forcedeth 0000:00:08.0: DMA-API: device driver frees DMA memory with wrong
function [device address=0x00000000640444be] [size=66 bytes] [mapped as
single] [unmapped as page]
Modules linked in: nfsd exportfs bridge stp llc r8169
Pid: 0, comm: swapper Tainted: G W 2.6.28-dmatest-09289-g8bb99c0 #1
Call Trace:
<IRQ> [<ffffffff80240b22>] warn_slowpath+0xf2/0x130
[<ffffffff80647b70>] _spin_unlock+0x10/0x30
[<ffffffff80537e75>] usb_hcd_link_urb_to_ep+0x75/0xc0
[<ffffffff80647c22>] _spin_unlock_irqrestore+0x12/0x40
[<ffffffff8055347f>] ohci_urb_enqueue+0x19f/0x7c0
[<ffffffff80252f96>] queue_work+0x56/0x60
[<ffffffff80237e10>] enqueue_task_fair+0x20/0x50
[<ffffffff80539279>] usb_hcd_submit_urb+0x379/0xbc0
[<ffffffff803b78c3>] cpumask_next_and+0x23/0x40
[<ffffffff80235177>] find_busiest_group+0x207/0x8a0
[<ffffffff8064784f>] _spin_lock_irqsave+0x1f/0x50
[<ffffffff803c7ea3>] check_unmap+0x203/0x490
[<ffffffff803c8259>] debug_dma_unmap_page+0x49/0x50
[<ffffffff80485f26>] nv_tx_done_optimized+0xc6/0x2c0
[<ffffffff80486c13>] nv_nic_irq_optimized+0x73/0x2b0
[<ffffffff8026df84>] handle_IRQ_event+0x34/0x70
[<ffffffff8026ffe9>] handle_edge_irq+0xc9/0x150
[<ffffffff8020e3ab>] do_IRQ+0xcb/0x1c0
[<ffffffff8020c093>] ret_from_intr+0x0/0xa
<EOI> <4>---[ end trace f6435a98e2a38c0e ]---
The driver developer can find the driver and the device including a stacktrace
of the DMA-API call which caused this warning.
Per default only the first error will result in a warning message. All other
errors will only silently counted. This limitation exist to prevent the code
from flooding your kernel log. To support debugging a device driver this can
be disabled via debugfs. See the debugfs interface documentation below for
details.
The debugfs directory for the DMA-API debugging code is called dma-api/. In
this directory the following files can currently be found:
dma-api/all_errors This file contains a numeric value. If this
value is not equal to zero the debugging code
will print a warning for every error it finds
into the kernel log. Be carefull with this
option. It can easily flood your logs.
dma-api/disabled This read-only file contains the character 'Y'
if the debugging code is disabled. This can
happen when it runs out of memory or if it was
disabled at boot time
dma-api/error_count This file is read-only and shows the total
numbers of errors found.
dma-api/num_errors The number in this file shows how many
warnings will be printed to the kernel log
before it stops. This number is initialized to
one at system boot and be set by writing into
this file
dma-api/min_free_entries
This read-only file can be read to get the
minimum number of free dma_debug_entries the
allocator has ever seen. If this value goes
down to zero the code will disable itself
because it is not longer reliable.
dma-api/num_free_entries
The current number of free dma_debug_entries
in the allocator.
If you have this code compiled into your kernel it will be enabled by default.
If you want to boot without the bookkeeping anyway you can provide
'dma_debug=off' as a boot parameter. This will disable DMA-API debugging.
Notice that you can not enable it again at runtime. You have to reboot to do
so.
When the code disables itself at runtime this is most likely because it ran
out of dma_debug_entries. These entries are preallocated at boot. The number
of preallocated entries is defined per architecture. If it is too low for you
boot with 'dma_debug_entries=<your_desired_number>' to overwrite the
architectural default.
Documentation/DocBook/.gitignore
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......@@ -4,3 +4,7 @@
*.html
*.9.gz
*.9
*.aux
*.dvi
*.log
*.out
Documentation/DocBook/Makefile
浏览文件 @ f541ae32
......@@ -12,7 +12,8 @@ DOCBOOKS := z8530book.xml mcabook.xml device-drivers.xml \
kernel-api.xml filesystems.xml lsm.xml usb.xml kgdb.xml \
gadget.xml libata.xml mtdnand.xml librs.xml rapidio.xml \
genericirq.xml s390-drivers.xml uio-howto.xml scsi.xml \
mac80211.xml debugobjects.xml sh.xml regulator.xml
mac80211.xml debugobjects.xml sh.xml regulator.xml \
alsa-driver-api.xml writing-an-alsa-driver.xml
###
# The build process is as follows (targets):
......
Documentation/DocBook/alsa-driver-api.tmpl 0 → 100644
浏览文件 @ f541ae32
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook XML V4.1.2//EN"
"http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd" []>
<!-- ****************************************************** -->
<!-- Header -->
<!-- ****************************************************** -->
<book id="ALSA-Driver-API">
<bookinfo>
<title>The ALSA Driver API</title>
<legalnotice>
<para>
This document is free; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
</para>
<para>
This document is distributed in the hope that it will be useful,
but <emphasis>WITHOUT ANY WARRANTY</emphasis>; without even the
implied warranty of <emphasis>MERCHANTABILITY or FITNESS FOR A
PARTICULAR PURPOSE</emphasis>. See the GNU General Public License
for more details.
</para>
<para>
You should have received a copy of the GNU General Public
License along with this program; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston,
MA 02111-1307 USA
</para>
</legalnotice>
</bookinfo>
<toc></toc>
<chapter><title>Management of Cards and Devices</title>
<sect1><title>Card Management</title>
!Esound/core/init.c
</sect1>
<sect1><title>Device Components</title>
!Esound/core/device.c
</sect1>
<sect1><title>Module requests and Device File Entries</title>
!Esound/core/sound.c
</sect1>
<sect1><title>Memory Management Helpers</title>
!Esound/core/memory.c
!Esound/core/memalloc.c
</sect1>
</chapter>
<chapter><title>PCM API</title>
<sect1><title>PCM Core</title>
!Esound/core/pcm.c
!Esound/core/pcm_lib.c
!Esound/core/pcm_native.c
</sect1>
<sect1><title>PCM Format Helpers</title>
!Esound/core/pcm_misc.c
</sect1>
<sect1><title>PCM Memory Management</title>
!Esound/core/pcm_memory.c
</sect1>
</chapter>
<chapter><title>Control/Mixer API</title>
<sect1><title>General Control Interface</title>
!Esound/core/control.c
</sect1>
<sect1><title>AC97 Codec API</title>
!Esound/pci/ac97/ac97_codec.c
!Esound/pci/ac97/ac97_pcm.c
</sect1>
<sect1><title>Virtual Master Control API</title>
!Esound/core/vmaster.c
!Iinclude/sound/control.h
</sect1>
</chapter>
<chapter><title>MIDI API</title>
<sect1><title>Raw MIDI API</title>
!Esound/core/rawmidi.c
</sect1>
<sect1><title>MPU401-UART API</title>
!Esound/drivers/mpu401/mpu401_uart.c
</sect1>
</chapter>
<chapter><title>Proc Info API</title>
<sect1><title>Proc Info Interface</title>
!Esound/core/info.c
</sect1>
</chapter>
<chapter><title>Miscellaneous Functions</title>
<sect1><title>Hardware-Dependent Devices API</title>
!Esound/core/hwdep.c
</sect1>
<sect1><title>Jack Abstraction Layer API</title>
!Esound/core/jack.c
</sect1>
<sect1><title>ISA DMA Helpers</title>
!Esound/core/isadma.c
</sect1>
<sect1><title>Other Helper Macros</title>
!Iinclude/sound/core.h
</sect1>
</chapter>
</book>
Documentation/DocBook/genericirq.tmpl
浏览文件 @ f541ae32
......@@ -440,6 +440,7 @@ desc->chip->end();
used in the generic IRQ layer.
</para>
!Iinclude/linux/irq.h
!Iinclude/linux/interrupt.h
</chapter>
<chapter id="pubfunctions">
......
Documentation/DocBook/kernel-api.tmpl
浏览文件 @ f541ae32
......@@ -199,6 +199,7 @@ X!Edrivers/pci/hotplug.c
-->
!Edrivers/pci/probe.c
!Edrivers/pci/rom.c
!Edrivers/pci/iov.c
</sect1>
<sect1><title>PCI Hotplug Support Library</title>
!Edrivers/pci/hotplug/pci_hotplug_core.c
......
Documentation/DocBook/mac80211.tmpl
浏览文件 @ f541ae32
......@@ -17,8 +17,7 @@
</authorgroup>
<copyright>
<year>2007</year>
<year>2008</year>
<year>2007-2009</year>
<holder>Johannes Berg</holder>
</copyright>
......@@ -165,8 +164,8 @@ usage should require reading the full document.
!Pinclude/net/mac80211.h Frame format
</sect1>
<sect1>
<title>Alignment issues</title>
<para>TBD</para>
<title>Packet alignment</title>
!Pnet/mac80211/rx.c Packet alignment
</sect1>
<sect1>
<title>Calling into mac80211 from interrupts</title>
......@@ -223,6 +222,17 @@ usage should require reading the full document.
!Finclude/net/mac80211.h ieee80211_key_flags
</chapter>
<chapter id="powersave">
<title>Powersave support</title>
!Pinclude/net/mac80211.h Powersave support
</chapter>
<chapter id="beacon-filter">
<title>Beacon filter support</title>
!Pinclude/net/mac80211.h Beacon filter support
!Finclude/net/mac80211.h ieee80211_beacon_loss
</chapter>
<chapter id="qos">
<title>Multiple queues and QoS support</title>
<para>TBD</para>
......
Documentation/DocBook/procfs_example.c
浏览文件 @ f541ae32
......@@ -117,9 +117,6 @@ static int __init init_procfs_example(void)
rv = -ENOMEM;
goto out;
}
example_dir->owner = THIS_MODULE;
/* create jiffies using convenience function */
jiffies_file = create_proc_read_entry("jiffies",
0444, example_dir,
......@@ -130,8 +127,6 @@ static int __init init_procfs_example(void)
goto no_jiffies;
}
jiffies_file->owner = THIS_MODULE;
/* create foo and bar files using same callback
* functions
*/
......@@ -146,7 +141,6 @@ static int __init init_procfs_example(void)
foo_file->data = &foo_data;
foo_file->read_proc = proc_read_foobar;
foo_file->write_proc = proc_write_foobar;
foo_file->owner = THIS_MODULE;
bar_file = create_proc_entry("bar", 0644, example_dir);
if(bar_file == NULL) {
......@@ -159,7 +153,6 @@ static int __init init_procfs_example(void)
bar_file->data = &bar_data;
bar_file->read_proc = proc_read_foobar;
bar_file->write_proc = proc_write_foobar;
bar_file->owner = THIS_MODULE;
/* create symlink */
symlink = proc_symlink("jiffies_too", example_dir,
......@@ -169,8 +162,6 @@ static int __init init_procfs_example(void)
goto no_symlink;
}
symlink->owner = THIS_MODULE;
/* everything OK */
printk(KERN_INFO "%s %s initialised\n",
MODULE_NAME, MODULE_VERS);
......
Documentation/DocBook/uio-howto.tmpl
浏览文件 @ f541ae32
......@@ -41,6 +41,13 @@ GPL version 2.
</abstract>
<revhistory>
<revision>
<revnumber>0.8</revnumber>
<date>2008-12-24</date>
<authorinitials>hjk</authorinitials>
<revremark>Added name attributes in mem and portio sysfs directories.
</revremark>
</revision>
<revision>
<revnumber>0.7</revnumber>
<date>2008-12-23</date>
......@@ -303,10 +310,17 @@ interested in translating it, please email me
appear if the size of the mapping is not 0.
</para>
<para>
Each <filename>mapX/</filename> directory contains two read-only files
that show start address and size of the memory:
Each <filename>mapX/</filename> directory contains four read-only files
that show attributes of the memory:
</para>
<itemizedlist>
<listitem>
<para>
<filename>name</filename>: A string identifier for this mapping. This
is optional, the string can be empty. Drivers can set this to make it
easier for userspace to find the correct mapping.
</para>
</listitem>
<listitem>
<para>
<filename>addr</filename>: The address of memory that can be mapped.
......@@ -366,10 +380,17 @@ offset = N * getpagesize();
<filename>/sys/class/uio/uioX/portio/</filename>.
</para>
<para>
Each <filename>portX/</filename> directory contains three read-only
files that show start, size, and type of the port region:
Each <filename>portX/</filename> directory contains four read-only
files that show name, start, size, and type of the port region:
</para>
<itemizedlist>
<listitem>
<para>
<filename>name</filename>: A string identifier for this port region.
The string is optional and can be empty. Drivers can set it to make it
easier for userspace to find a certain port region.
</para>
</listitem>
<listitem>
<para>
<filename>start</filename>: The first port of this region.
......
Documentation/DocBook/writing-an-alsa-driver.tmpl 0 → 100644
浏览文件 @ f541ae32
此差异已折叠。
Documentation/PCI/MSI-HOWTO.txt
浏览文件 @ f541ae32
此差异已折叠。
Documentation/PCI/pci-iov-howto.txt 0 → 100644
浏览文件 @ f541ae32
PCI Express I/O Virtualization Howto
Copyright (C) 2009 Intel Corporation
Yu Zhao <yu.zhao@intel.com>
1. Overview
1.1 What is SR-IOV
Single Root I/O Virtualization (SR-IOV) is a PCI Express Extended
capability which makes one physical device appear as multiple virtual
devices. The physical device is referred to as Physical Function (PF)
while the virtual devices are referred to as Virtual Functions (VF).
Allocation of the VF can be dynamically controlled by the PF via
registers encapsulated in the capability. By default, this feature is
not enabled and the PF behaves as traditional PCIe device. Once it's
turned on, each VF's PCI configuration space can be accessed by its own
Bus, Device and Function Number (Routing ID). And each VF also has PCI
Memory Space, which is used to map its register set. VF device driver
operates on the register set so it can be functional and appear as a
real existing PCI device.
2. User Guide
2.1 How can I enable SR-IOV capability
The device driver (PF driver) will control the enabling and disabling
of the capability via API provided by SR-IOV core. If the hardware
has SR-IOV capability, loading its PF driver would enable it and all
VFs associated with the PF.
2.2 How can I use the Virtual Functions
The VF is treated as hot-plugged PCI devices in the kernel, so they
should be able to work in the same way as real PCI devices. The VF
requires device driver that is same as a normal PCI device's.
3. Developer Guide
3.1 SR-IOV API
To enable SR-IOV capability:
int pci_enable_sriov(struct pci_dev *dev, int nr_virtfn);
'nr_virtfn' is number of VFs to be enabled.
To disable SR-IOV capability:
void pci_disable_sriov(struct pci_dev *dev);
To notify SR-IOV core of Virtual Function Migration:
irqreturn_t pci_sriov_migration(struct pci_dev *dev);
3.2 Usage example
Following piece of code illustrates the usage of the SR-IOV API.
static int __devinit dev_probe(struct pci_dev *dev, const struct pci_device_id *id)
{
pci_enable_sriov(dev, NR_VIRTFN);
...
return 0;
}
static void __devexit dev_remove(struct pci_dev *dev)
{
pci_disable_sriov(dev);
...
}
static int dev_suspend(struct pci_dev *dev, pm_message_t state)
{
...
return 0;
}
static int dev_resume(struct pci_dev *dev)
{
...
return 0;
}
static void dev_shutdown(struct pci_dev *dev)
{
...
}
static struct pci_driver dev_driver = {
.name = "SR-IOV Physical Function driver",
.id_table = dev_id_table,
.probe = dev_probe,
.remove = __devexit_p(dev_remove),
.suspend = dev_suspend,
.resume = dev_resume,
.shutdown = dev_shutdown,
};
Documentation/RCU/checklist.txt
浏览文件 @ f541ae32
......@@ -298,3 +298,15 @@ over a rather long period of time, but improvements are always welcome!
Note that, rcu_assign_pointer() and rcu_dereference() relate to
SRCU just as they do to other forms of RCU.
15. The whole point of call_rcu(), synchronize_rcu(), and friends
is to wait until all pre-existing readers have finished before
carrying out some otherwise-destructive operation. It is
therefore critically important to -first- remove any path
that readers can follow that could be affected by the
destructive operation, and -only- -then- invoke call_rcu(),
synchronize_rcu(), or friends.
Because these primitives only wait for pre-existing readers,
it is the caller's responsibility to guarantee safety to
any subsequent readers.
Documentation/RCU/listRCU.txt
浏览文件 @ f541ae32
......@@ -118,7 +118,7 @@ Following are the RCU equivalents for these two functions:
list_for_each_entry(e, list, list) {
if (!audit_compare_rule(rule, &e->rule)) {
list_del_rcu(&e->list);
call_rcu(&e->rcu, audit_free_rule, e);
call_rcu(&e->rcu, audit_free_rule);
return 0;
}
}
......@@ -206,7 +206,7 @@ RCU ("read-copy update") its name. The RCU code is as follows:
ne->rule.action = newaction;
ne->rule.file_count = newfield_count;
list_replace_rcu(e, ne);
call_rcu(&e->rcu, audit_free_rule, e);
call_rcu(&e->rcu, audit_free_rule);
return 0;
}
}
......@@ -283,7 +283,7 @@ flag under the spinlock as follows:
list_del_rcu(&e->list);
e->deleted = 1;
spin_unlock(&e->lock);
call_rcu(&e->rcu, audit_free_rule, e);
call_rcu(&e->rcu, audit_free_rule);
return 0;
}
}
......
Documentation/RCU/rcu.txt
浏览文件 @ f541ae32
......@@ -81,7 +81,7 @@ o I hear that RCU needs work in order to support realtime kernels?
This work is largely completed. Realtime-friendly RCU can be
enabled via the CONFIG_PREEMPT_RCU kernel configuration parameter.
However, work is in progress for enabling priority boosting of
preempted RCU read-side critical sections.This is needed if you
preempted RCU read-side critical sections. This is needed if you
have CPU-bound realtime threads.
o Where can I find more information on RCU?
......
Documentation/RCU/rculist_nulls.txt
浏览文件 @ f541ae32
......@@ -21,7 +21,7 @@ if (obj) {
/*
* Because a writer could delete object, and a writer could
* reuse these object before the RCU grace period, we
* must check key after geting the reference on object
* must check key after getting the reference on object
*/
if (obj->key != key) { // not the object we expected
put_ref(obj);
......@@ -117,7 +117,7 @@ a race (some writer did a delete and/or a move of an object
to another chain) checking the final 'nulls' value if
the lookup met the end of chain. If final 'nulls' value
is not the slot number, then we must restart the lookup at
the begining. If the object was moved to same chain,
the beginning. If the object was moved to the same chain,
then the reader doesnt care : It might eventually
scan the list again without harm.
......
Documentation/Smack.txt
浏览文件 @ f541ae32
......@@ -184,14 +184,16 @@ length. Single character labels using special characters, that being anything
other than a letter or digit, are reserved for use by the Smack development
team. Smack labels are unstructured, case sensitive, and the only operation
ever performed on them is comparison for equality. Smack labels cannot
contain unprintable characters or the "/" (slash) character.
contain unprintable characters or the "/" (slash) character. Smack labels
cannot begin with a '-', which is reserved for special options.
There are some predefined labels:
_ Pronounced "floor", a single underscore character.
^ Pronounced "hat", a single circumflex character.
* Pronounced "star", a single asterisk character.
? Pronounced "huh", a single question mark character.
_ Pronounced "floor", a single underscore character.
^ Pronounced "hat", a single circumflex character.
* Pronounced "star", a single asterisk character.
? Pronounced "huh", a single question mark character.
@ Pronounced "Internet", a single at sign character.
Every task on a Smack system is assigned a label. System tasks, such as
init(8) and systems daemons, are run with the floor ("_") label. User tasks
......@@ -412,6 +414,36 @@ sockets.
A privileged program may set this to match the label of another
task with which it hopes to communicate.
Smack Netlabel Exceptions
You will often find that your labeled application has to talk to the outside,
unlabeled world. To do this there's a special file /smack/netlabel where you can
add some exceptions in the form of :
@IP1 LABEL1 or
@IP2/MASK LABEL2
It means that your application will have unlabeled access to @IP1 if it has
write access on LABEL1, and access to the subnet @IP2/MASK if it has write
access on LABEL2.
Entries in the /smack/netlabel file are matched by longest mask first, like in
classless IPv4 routing.
A special label '@' and an option '-CIPSO' can be used there :
@ means Internet, any application with any label has access to it
-CIPSO means standard CIPSO networking
If you don't know what CIPSO is and don't plan to use it, you can just do :
echo 127.0.0.1 -CIPSO > /smack/netlabel
echo 0.0.0.0/0 @ > /smack/netlabel
If you use CIPSO on your 192.168.0.0/16 local network and need also unlabeled
Internet access, you can have :
echo 127.0.0.1 -CIPSO > /smack/netlabel
echo 192.168.0.0/16 -CIPSO > /smack/netlabel
echo 0.0.0.0/0 @ > /smack/netlabel
Writing Applications for Smack
There are three sorts of applications that will run on a Smack system. How an
......
Documentation/arm/Samsung-S3C24XX/Suspend.txt
浏览文件 @ f541ae32
......@@ -40,13 +40,13 @@ Resuming
Machine Support
---------------
The machine specific functions must call the s3c2410_pm_init() function
The machine specific functions must call the s3c_pm_init() function
to say that its bootloader is capable of resuming. This can be as
simple as adding the following to the machine's definition:
INITMACHINE(s3c2410_pm_init)
INITMACHINE(s3c_pm_init)
A board can do its own setup before calling s3c2410_pm_init, if it
A board can do its own setup before calling s3c_pm_init, if it
needs to setup anything else for power management support.
There is currently no support for over-riding the default method of
......@@ -74,7 +74,7 @@ statuc void __init machine_init(void)
enable_irq_wake(IRQ_EINT0);
s3c2410_pm_init();
s3c_pm_init();
}
......
Documentation/arm/memory.txt
浏览文件 @ f541ae32
......@@ -29,7 +29,14 @@ ffff0000 ffff0fff CPU vector page.
CPU supports vector relocation (control
register V bit.)
ffc00000 fffeffff DMA memory mapping region. Memory returned
fffe0000 fffeffff XScale cache flush area. This is used
in proc-xscale.S to flush the whole data
cache. Free for other usage on non-XScale.
fff00000 fffdffff Fixmap mapping region. Addresses provided
by fix_to_virt() will be located here.
ffc00000 ffefffff DMA memory mapping region. Memory returned
by the dma_alloc_xxx functions will be
dynamically mapped here.
......
Documentation/block/switching-sched.txt
浏览文件 @ f541ae32
......@@ -35,9 +35,3 @@ noop anticipatory deadline [cfq]
# echo anticipatory > /sys/block/hda/queue/scheduler
# cat /sys/block/hda/queue/scheduler
noop [anticipatory] deadline cfq
Each io queue has a set of io scheduler tunables associated with it. These
tunables control how the io scheduler works. You can find these entries
in:
/sys/block/<device>/queue/iosched
Documentation/cgroups/00-INDEX 0 → 100644
浏览文件 @ f541ae32
00-INDEX
- this file
cgroups.txt
- Control Groups definition, implementation details, examples and API.
cpuacct.txt
- CPU Accounting Controller; account CPU usage for groups of tasks.
cpusets.txt
- documents the cpusets feature; assign CPUs and Mem to a set of tasks.
devices.txt
- Device Whitelist Controller; description, interface and security.
freezer-subsystem.txt
- checkpointing; rationale to not use signals, interface.
memcg_test.txt
- Memory Resource Controller; implementation details.
memory.txt
- Memory Resource Controller; design, accounting, interface, testing.
resource_counter.txt
- Resource Counter API.
Documentation/cgroups/cgroups.txt
浏览文件 @ f541ae32
......@@ -56,7 +56,7 @@ hierarchy, and a set of subsystems; each subsystem has system-specific
state attached to each cgroup in the hierarchy. Each hierarchy has
an instance of the cgroup virtual filesystem associated with it.
At any one time there may be multiple active hierachies of task
At any one time there may be multiple active hierarchies of task
cgroups. Each hierarchy is a partition of all tasks in the system.
User level code may create and destroy cgroups by name in an
......@@ -124,10 +124,10 @@ following lines:
/ \
Prof (15%) students (5%)
Browsers like firefox/lynx go into the WWW network class, while (k)nfsd go
Browsers like Firefox/Lynx go into the WWW network class, while (k)nfsd go
into NFS network class.
At the same time firefox/lynx will share an appropriate CPU/Memory class
At the same time Firefox/Lynx will share an appropriate CPU/Memory class
depending on who launched it (prof/student).
With the ability to classify tasks differently for different resources
......@@ -325,7 +325,7 @@ and then start a subshell 'sh' in that cgroup:
Creating, modifying, using the cgroups can be done through the cgroup
virtual filesystem.
To mount a cgroup hierarchy will all available subsystems, type:
To mount a cgroup hierarchy with all available subsystems, type:
# mount -t cgroup xxx /dev/cgroup
The "xxx" is not interpreted by the cgroup code, but will appear in
......@@ -333,12 +333,23 @@ The "xxx" is not interpreted by the cgroup code, but will appear in
To mount a cgroup hierarchy with just the cpuset and numtasks
subsystems, type:
# mount -t cgroup -o cpuset,numtasks hier1 /dev/cgroup
# mount -t cgroup -o cpuset,memory hier1 /dev/cgroup
To change the set of subsystems bound to a mounted hierarchy, just
remount with different options:
# mount -o remount,cpuset,ns hier1 /dev/cgroup
# mount -o remount,cpuset,ns /dev/cgroup
Now memory is removed from the hierarchy and ns is added.
Note this will add ns to the hierarchy but won't remove memory or
cpuset, because the new options are appended to the old ones:
# mount -o remount,ns /dev/cgroup
To Specify a hierarchy's release_agent:
# mount -t cgroup -o cpuset,release_agent="/sbin/cpuset_release_agent" \
xxx /dev/cgroup
Note that specifying 'release_agent' more than once will return failure.
Note that changing the set of subsystems is currently only supported
when the hierarchy consists of a single (root) cgroup. Supporting
......@@ -349,6 +360,11 @@ Then under /dev/cgroup you can find a tree that corresponds to the
tree of the cgroups in the system. For instance, /dev/cgroup
is the cgroup that holds the whole system.
If you want to change the value of release_agent:
# echo "/sbin/new_release_agent" > /dev/cgroup/release_agent
It can also be changed via remount.
If you want to create a new cgroup under /dev/cgroup:
# cd /dev/cgroup
# mkdir my_cgroup
......@@ -476,11 +492,13 @@ cgroup->parent is still valid. (Note - can also be called for a
newly-created cgroup if an error occurs after this subsystem's
create() method has been called for the new cgroup).
void pre_destroy(struct cgroup_subsys *ss, struct cgroup *cgrp);
int pre_destroy(struct cgroup_subsys *ss, struct cgroup *cgrp);
Called before checking the reference count on each subsystem. This may
be useful for subsystems which have some extra references even if
there are not tasks in the cgroup.
there are not tasks in the cgroup. If pre_destroy() returns error code,
rmdir() will fail with it. From this behavior, pre_destroy() can be
called multiple times against a cgroup.
int can_attach(struct cgroup_subsys *ss, struct cgroup *cgrp,
struct task_struct *task)
......@@ -521,7 +539,7 @@ always handled well.
void post_clone(struct cgroup_subsys *ss, struct cgroup *cgrp)
(cgroup_mutex held by caller)
Called at the end of cgroup_clone() to do any paramater
Called at the end of cgroup_clone() to do any parameter
initialization which might be required before a task could attach. For
example in cpusets, no task may attach before 'cpus' and 'mems' are set
up.
......
Documentation/cgroups/cpusets.txt
浏览文件 @ f541ae32
......@@ -131,7 +131,7 @@ Cpusets extends these two mechanisms as follows:
- The hierarchy of cpusets can be mounted at /dev/cpuset, for
browsing and manipulation from user space.
- A cpuset may be marked exclusive, which ensures that no other
cpuset (except direct ancestors and descendents) may contain
cpuset (except direct ancestors and descendants) may contain
any overlapping CPUs or Memory Nodes.
- You can list all the tasks (by pid) attached to any cpuset.
......@@ -226,7 +226,7 @@ nodes with memory--using the cpuset_track_online_nodes() hook.
--------------------------------
If a cpuset is cpu or mem exclusive, no other cpuset, other than
a direct ancestor or descendent, may share any of the same CPUs or
a direct ancestor or descendant, may share any of the same CPUs or
Memory Nodes.
A cpuset that is mem_exclusive *or* mem_hardwall is "hardwalled",
......@@ -427,7 +427,7 @@ child cpusets have this flag enabled.
When doing this, you don't usually want to leave any unpinned tasks in
the top cpuset that might use non-trivial amounts of CPU, as such tasks
may be artificially constrained to some subset of CPUs, depending on
the particulars of this flag setting in descendent cpusets. Even if
the particulars of this flag setting in descendant cpusets. Even if
such a task could use spare CPU cycles in some other CPUs, the kernel
scheduler might not consider the possibility of load balancing that
task to that underused CPU.
......@@ -531,9 +531,9 @@ be idle.
Of course it takes some searching cost to find movable tasks and/or
idle CPUs, the scheduler might not search all CPUs in the domain
everytime. In fact, in some architectures, the searching ranges on
every time. In fact, in some architectures, the searching ranges on
events are limited in the same socket or node where the CPU locates,
while the load balance on tick searchs all.
while the load balance on tick searches all.
For example, assume CPU Z is relatively far from CPU X. Even if CPU Z
is idle while CPU X and the siblings are busy, scheduler can't migrate
......@@ -601,7 +601,7 @@ its new cpuset, then the task will continue to use whatever subset
of MPOL_BIND nodes are still allowed in the new cpuset. If the task
was using MPOL_BIND and now none of its MPOL_BIND nodes are allowed
in the new cpuset, then the task will be essentially treated as if it
was MPOL_BIND bound to the new cpuset (even though its numa placement,
was MPOL_BIND bound to the new cpuset (even though its NUMA placement,
as queried by get_mempolicy(), doesn't change). If a task is moved
from one cpuset to another, then the kernel will adjust the tasks
memory placement, as above, the next time that the kernel attempts
......
Documentation/cgroups/devices.txt
浏览文件 @ f541ae32
......@@ -42,7 +42,7 @@ suffice, but we can decide the best way to adequately restrict
movement as people get some experience with this. We may just want
to require CAP_SYS_ADMIN, which at least is a separate bit from
CAP_MKNOD. We may want to just refuse moving to a cgroup which
isn't a descendent of the current one. Or we may want to use
isn't a descendant of the current one. Or we may want to use
CAP_MAC_ADMIN, since we really are trying to lock down root.
CAP_SYS_ADMIN is needed to modify the whitelist or move another
......
Documentation/cgroups/memcg_test.txt
浏览文件 @ f541ae32
Memory Resource Controller(Memcg) Implementation Memo.
Last Updated: 2009/1/19
Last Updated: 2009/1/20
Base Kernel Version: based on 2.6.29-rc2.
Because VM is getting complex (one of reasons is memcg...), memcg's behavior
......@@ -356,7 +356,25 @@ Under below explanation, we assume CONFIG_MEM_RES_CTRL_SWAP=y.
(Shell-B)
# move all tasks in /cgroup/test to /cgroup
# /sbin/swapoff -a
# rmdir /test/cgroup
# rmdir /cgroup/test
# kill malloc task.
Of course, tmpfs v.s. swapoff test should be tested, too.
9.8 OOM-Killer
Out-of-memory caused by memcg's limit will kill tasks under
the memcg. When hierarchy is used, a task under hierarchy
will be killed by the kernel.
In this case, panic_on_oom shouldn't be invoked and tasks
in other groups shouldn't be killed.
It's not difficult to cause OOM under memcg as following.
Case A) when you can swapoff
#swapoff -a
#echo 50M > /memory.limit_in_bytes
run 51M of malloc
Case B) when you use mem+swap limitation.
#echo 50M > memory.limit_in_bytes
#echo 50M > memory.memsw.limit_in_bytes
run 51M of malloc
Documentation/cgroups/memory.txt
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......@@ -302,7 +302,7 @@ will be charged as a new owner of it.
unevictable - # of pages cannot be reclaimed.(mlocked etc)
Below is depend on CONFIG_DEBUG_VM.
inactive_ratio - VM inernal parameter. (see mm/page_alloc.c)
inactive_ratio - VM internal parameter. (see mm/page_alloc.c)
recent_rotated_anon - VM internal parameter. (see mm/vmscan.c)
recent_rotated_file - VM internal parameter. (see mm/vmscan.c)
recent_scanned_anon - VM internal parameter. (see mm/vmscan.c)
......
Documentation/cpu-freq/governors.txt
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......@@ -117,10 +117,28 @@ accessible parameters:
sampling_rate: measured in uS (10^-6 seconds), this is how often you
want the kernel to look at the CPU usage and to make decisions on
what to do about the frequency. Typically this is set to values of
around '10000' or more.
show_sampling_rate_(min|max): the minimum and maximum sampling rates
available that you may set 'sampling_rate' to.
around '10000' or more. It's default value is (cmp. with users-guide.txt):
transition_latency * 1000
The lowest value you can set is:
transition_latency * 100 or it may get restricted to a value where it
makes not sense for the kernel anymore to poll that often which depends
on your HZ config variable (HZ=1000: max=20000us, HZ=250: max=5000).
Be aware that transition latency is in ns and sampling_rate is in us, so you
get the same sysfs value by default.
Sampling rate should always get adjusted considering the transition latency
To set the sampling rate 750 times as high as the transition latency
in the bash (as said, 1000 is default), do:
echo `$(($(cat cpuinfo_transition_latency) * 750 / 1000)) \
>ondemand/sampling_rate
show_sampling_rate_(min|max): THIS INTERFACE IS DEPRECATED, DON'T USE IT.
You can use wider ranges now and the general
cpuinfo_transition_latency variable (cmp. with user-guide.txt) can be
used to obtain exactly the same info:
show_sampling_rate_min = transtition_latency * 500 / 1000
show_sampling_rate_max = transtition_latency * 500000 / 1000
(divided by 1000 is to illustrate that sampling rate is in us and
transition latency is exported ns).
up_threshold: defines what the average CPU usage between the samplings
of 'sampling_rate' needs to be for the kernel to make a decision on
......
Documentation/cpu-freq/user-guide.txt
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......@@ -152,6 +152,18 @@ cpuinfo_min_freq : this file shows the minimum operating
frequency the processor can run at(in kHz)
cpuinfo_max_freq : this file shows the maximum operating
frequency the processor can run at(in kHz)
cpuinfo_transition_latency The time it takes on this CPU to
switch between two frequencies in nano
seconds. If unknown or known to be
that high that the driver does not
work with the ondemand governor, -1
(CPUFREQ_ETERNAL) will be returned.
Using this information can be useful
to choose an appropriate polling
frequency for a kernel governor or
userspace daemon. Make sure to not
switch the frequency too often
resulting in performance loss.
scaling_driver : this file shows what cpufreq driver is
used to set the frequency on this CPU
......
Documentation/devices.txt
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LINUX ALLOCATED DEVICES (2.6+ version)
Maintained by Torben Mathiasen <device@lanana.org>
Maintained by Alan Cox <device@lanana.org>
Last revised: 29 November 2006
......@@ -67,6 +67,11 @@ up to date. Due to the number of registrations I have to maintain it
in "batch mode", so there is likely additional registrations that
haven't been listed yet.
Fourth, remember that Linux now has extensive support for dynamic allocation
of device numbering and can use sysfs and udev to handle the naming needs.
There are still some exceptions in the serial and boot device area. Before
asking for a device number make sure you actually need one.
Finally, sometimes I have to play "namespace police." Please don't be
offended. I often get submissions for /dev names that would be bound
to cause conflicts down the road. I am trying to avoid getting in a
......@@ -101,7 +106,7 @@ Your cooperation is appreciated.
0 = /dev/ram0 First RAM disk
1 = /dev/ram1 Second RAM disk
...
250 = /dev/initrd Initial RAM disk {2.6}
250 = /dev/initrd Initial RAM disk
Older kernels had /dev/ramdisk (1, 1) here.
/dev/initrd refers to a RAM disk which was preloaded
......@@ -340,7 +345,7 @@ Your cooperation is appreciated.
14 = /dev/touchscreen/ucb1x00 UCB 1x00 touchscreen
15 = /dev/touchscreen/mk712 MK712 touchscreen
128 = /dev/beep Fancy beep device
129 = /dev/modreq Kernel module load request {2.6}
129 =
130 = /dev/watchdog Watchdog timer port
131 = /dev/temperature Machine internal temperature
132 = /dev/hwtrap Hardware fault trap
......@@ -350,10 +355,10 @@ Your cooperation is appreciated.
139 = /dev/openprom SPARC OpenBoot PROM
140 = /dev/relay8 Berkshire Products Octal relay card
141 = /dev/relay16 Berkshire Products ISO-16 relay card
142 = /dev/msr x86 model-specific registers {2.6}
142 =
143 = /dev/pciconf PCI configuration space
144 = /dev/nvram Non-volatile configuration RAM
145 = /dev/hfmodem Soundcard shortwave modem control {2.6}
145 = /dev/hfmodem Soundcard shortwave modem control
146 = /dev/graphics Linux/SGI graphics device
147 = /dev/opengl Linux/SGI OpenGL pipe
148 = /dev/gfx Linux/SGI graphics effects device
......@@ -435,6 +440,9 @@ Your cooperation is appreciated.
228 = /dev/hpet HPET driver
229 = /dev/fuse Fuse (virtual filesystem in user-space)
230 = /dev/midishare MidiShare driver
231 = /dev/snapshot System memory snapshot device
232 = /dev/kvm Kernel-based virtual machine (hardware virtualization extensions)
233 = /dev/kmview View-OS A process with a view
240-254 Reserved for local use
255 Reserved for MISC_DYNAMIC_MINOR
......@@ -466,10 +474,7 @@ Your cooperation is appreciated.
The device names specified are proposed -- if there
are "standard" names for these devices, please let me know.
12 block MSCDEX CD-ROM callback support {2.6}
0 = /dev/dos_cd0 First MSCDEX CD-ROM
1 = /dev/dos_cd1 Second MSCDEX CD-ROM
...
12 block
13 char Input core
0 = /dev/input/js0 First joystick
......@@ -498,7 +503,7 @@ Your cooperation is appreciated.
2 = /dev/midi00 First MIDI port
3 = /dev/dsp Digital audio
4 = /dev/audio Sun-compatible digital audio
6 = /dev/sndstat Sound card status information {2.6}
6 =
7 = /dev/audioctl SPARC audio control device
8 = /dev/sequencer2 Sequencer -- alternate device
16 = /dev/mixer1 Second soundcard mixer control
......@@ -510,14 +515,7 @@ Your cooperation is appreciated.
34 = /dev/midi02 Third MIDI port
50 = /dev/midi03 Fourth MIDI port
14 block BIOS harddrive callback support {2.6}
0 = /dev/dos_hda First BIOS harddrive whole disk
64 = /dev/dos_hdb Second BIOS harddrive whole disk
128 = /dev/dos_hdc Third BIOS harddrive whole disk
192 = /dev/dos_hdd Fourth BIOS harddrive whole disk
Partitions are handled in the same way as IDE disks
(see major number 3).
14 block
15 char Joystick
0 = /dev/js0 First analog joystick
......@@ -535,14 +533,14 @@ Your cooperation is appreciated.
16 block GoldStar CD-ROM
0 = /dev/gscd GoldStar CD-ROM
17 char Chase serial card
17 char OBSOLETE (was Chase serial card)
0 = /dev/ttyH0 First Chase port
1 = /dev/ttyH1 Second Chase port
...
17 block Optics Storage CD-ROM
0 = /dev/optcd Optics Storage CD-ROM
18 char Chase serial card - alternate devices
18 char OBSOLETE (was Chase serial card - alternate devices)
0 = /dev/cuh0 Callout device for ttyH0
1 = /dev/cuh1 Callout device for ttyH1
...
......@@ -644,8 +642,7 @@ Your cooperation is appreciated.
2 = /dev/sbpcd2 Panasonic CD-ROM controller 0 unit 2
3 = /dev/sbpcd3 Panasonic CD-ROM controller 0 unit 3
26 char Quanta WinVision frame grabber {2.6}
0 = /dev/wvisfgrab Quanta WinVision frame grabber
26 char
26 block Second Matsushita (Panasonic/SoundBlaster) CD-ROM
0 = /dev/sbpcd4 Panasonic CD-ROM controller 1 unit 0
......@@ -872,7 +869,7 @@ Your cooperation is appreciated.
and "user level packet I/O." This board is also
accessible as a standard networking "eth" device.
38 block Reserved for Linux/AP+
38 block OBSOLETE (was Linux/AP+)
39 char ML-16P experimental I/O board
0 = /dev/ml16pa-a0 First card, first analog channel
......@@ -892,29 +889,16 @@ Your cooperation is appreciated.
50 = /dev/ml16pb-c1 Second card, second counter/timer
51 = /dev/ml16pb-c2 Second card, third counter/timer
...
39 block Reserved for Linux/AP+
39 block
40 char Matrox Meteor frame grabber {2.6}
0 = /dev/mmetfgrab Matrox Meteor frame grabber
40 char
40 block Syquest EZ135 parallel port removable drive
0 = /dev/eza Parallel EZ135 drive, whole disk
This device is obsolete and will be removed in a
future version of Linux. It has been replaced with
the parallel port IDE disk driver at major number 45.
Partitions are handled in the same way as IDE disks
(see major number 3).
40 block
41 char Yet Another Micro Monitor
0 = /dev/yamm Yet Another Micro Monitor
41 block MicroSolutions BackPack parallel port CD-ROM
0 = /dev/bpcd BackPack CD-ROM
This device is obsolete and will be removed in a
future version of Linux. It has been replaced with
the parallel port ATAPI CD-ROM driver at major number 46.
41 block
42 char Demo/sample use
......@@ -1681,13 +1665,7 @@ Your cooperation is appreciated.
disks (see major number 3) except that the limit on
partitions is 15.
93 char IBM Smart Capture Card frame grabber {2.6}
0 = /dev/iscc0 First Smart Capture Card
1 = /dev/iscc1 Second Smart Capture Card
...
128 = /dev/isccctl0 First Smart Capture Card control
129 = /dev/isccctl1 Second Smart Capture Card control
...
93 char
93 block NAND Flash Translation Layer filesystem
0 = /dev/nftla First NFTL layer
......@@ -1695,10 +1673,7 @@ Your cooperation is appreciated.
...
240 = /dev/nftlp 16th NTFL layer
94 char miroVIDEO DC10/30 capture/playback device {2.6}
0 = /dev/dcxx0 First capture card
1 = /dev/dcxx1 Second capture card
...
94 char
94 block IBM S/390 DASD block storage
0 = /dev/dasda First DASD device, major
......@@ -1791,11 +1766,7 @@ Your cooperation is appreciated.
...
15 = /dev/amiraid/ar?p15 15th partition
102 char Philips SAA5249 Teletext signal decoder {2.6}
0 = /dev/tlk0 First Teletext decoder
1 = /dev/tlk1 Second Teletext decoder
2 = /dev/tlk2 Third Teletext decoder
3 = /dev/tlk3 Fourth Teletext decoder
102 char
102 block Compressed block device
0 = /dev/cbd/a First compressed block device, whole device
......@@ -1916,10 +1887,7 @@ Your cooperation is appreciated.
DAC960 (see major number 48) except that the limit on
partitions is 15.
111 char Philips SAA7146-based audio/video card {2.6}
0 = /dev/av0 First A/V card
1 = /dev/av1 Second A/V card
...
111 char
111 block Compaq Next Generation Drive Array, eighth controller
0 = /dev/cciss/c7d0 First logical drive, whole disk
......@@ -2079,8 +2047,8 @@ Your cooperation is appreciated.
...
119 char VMware virtual network control
0 = /dev/vmnet0 1st virtual network
1 = /dev/vmnet1 2nd virtual network
0 = /dev/vnet0 1st virtual network
1 = /dev/vnet1 2nd virtual network
...
120-127 char LOCAL/EXPERIMENTAL USE
......@@ -2450,7 +2418,7 @@ Your cooperation is appreciated.
2 = /dev/raw/raw2 Second raw I/O device
...
163 char UNASSIGNED (was Radio Tech BIM-XXX-RS232 radio modem - see 51)
163 char
164 char Chase Research AT/PCI-Fast serial card
0 = /dev/ttyCH0 AT/PCI-Fast board 0, port 0
......@@ -2542,6 +2510,12 @@ Your cooperation is appreciated.
1 = /dev/clanvi1 Second cLAN adapter
...
179 block MMC block devices
0 = /dev/mmcblk0 First SD/MMC card
1 = /dev/mmcblk0p1 First partition on first MMC card
8 = /dev/mmcblk1 Second SD/MMC card
...
179 char CCube DVXChip-based PCI products
0 = /dev/dvxirq0 First DVX device
1 = /dev/dvxirq1 Second DVX device
......@@ -2560,6 +2534,9 @@ Your cooperation is appreciated.
96 = /dev/usb/hiddev0 1st USB HID device
...
111 = /dev/usb/hiddev15 16th USB HID device
112 = /dev/usb/auer0 1st auerswald ISDN device
...
127 = /dev/usb/auer15 16th auerswald ISDN device
128 = /dev/usb/brlvgr0 First Braille Voyager device
...
131 = /dev/usb/brlvgr3 Fourth Braille Voyager device
......@@ -2810,6 +2787,16 @@ Your cooperation is appreciated.
...
190 = /dev/ttyUL3 Xilinx uartlite - port 3
191 = /dev/xvc0 Xen virtual console - port 0
192 = /dev/ttyPZ0 pmac_zilog - port 0
...
195 = /dev/ttyPZ3 pmac_zilog - port 3
196 = /dev/ttyTX0 TX39/49 serial port 0
...
204 = /dev/ttyTX7 TX39/49 serial port 7
205 = /dev/ttySC0 SC26xx serial port 0
206 = /dev/ttySC1 SC26xx serial port 1
207 = /dev/ttySC2 SC26xx serial port 2
208 = /dev/ttySC3 SC26xx serial port 3
205 char Low-density serial ports (alternate device)
0 = /dev/culu0 Callout device for ttyLU0
......@@ -3145,6 +3132,20 @@ Your cooperation is appreciated.
1 = /dev/blockrom1 Second ROM card's translation layer interface
...
259 block Block Extended Major
Used dynamically to hold additional partition minor
numbers and allow large numbers of partitions per device
259 char FPGA configuration interfaces
0 = /dev/icap0 First Xilinx internal configuration
1 = /dev/icap1 Second Xilinx internal configuration
260 char OSD (Object-based-device) SCSI Device
0 = /dev/osd0 First OSD Device
1 = /dev/osd1 Second OSD Device
...
255 = /dev/osd255 256th OSD Device
**** ADDITIONAL /dev DIRECTORY ENTRIES
This section details additional entries that should or may exist in
......
Documentation/dontdiff
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......@@ -62,7 +62,6 @@ aic7*reg_print.c*
aic7*seq.h*
aicasm
aicdb.h*
asm
asm-offsets.h
asm_offsets.h
autoconf.h*
......
Documentation/dvb/get_dvb_firmware
浏览文件 @ f541ae32
......@@ -25,7 +25,7 @@ use IO::Handle;
"tda10046lifeview", "av7110", "dec2000t", "dec2540t",
"dec3000s", "vp7041", "dibusb", "nxt2002", "nxt2004",
"or51211", "or51132_qam", "or51132_vsb", "bluebird",
"opera1");
"opera1", "cx231xx", "cx18", "cx23885", "pvrusb2" );
# Check args
syntax() if (scalar(@ARGV) != 1);
......@@ -37,8 +37,8 @@ for ($i=0; $i < scalar(@components); $i++) {
$outfile = eval($cid);
die $@ if $@;
print STDERR <<EOF;
Firmware $outfile extracted successfully.
Now copy it to either /usr/lib/hotplug/firmware or /lib/firmware
Firmware(s) $outfile extracted successfully.
Now copy it(they) to either /usr/lib/hotplug/firmware or /lib/firmware
(depending on configuration of firmware hotplug).
EOF
exit(0);
......@@ -345,6 +345,85 @@ sub or51211 {
$fwfile;
}
sub cx231xx {
my $fwfile = "v4l-cx231xx-avcore-01.fw";
my $url = "http://linuxtv.org/downloads/firmware/$fwfile";
my $hash = "7d3bb956dc9df0eafded2b56ba57cc42";
checkstandard();
wgetfile($fwfile, $url);
verify($fwfile, $hash);
$fwfile;
}
sub cx18 {
my $url = "http://linuxtv.org/downloads/firmware/";
my %files = (
'v4l-cx23418-apu.fw' => '588f081b562f5c653a3db1ad8f65939a',
'v4l-cx23418-cpu.fw' => 'b6c7ed64bc44b1a6e0840adaeac39d79',
'v4l-cx23418-dig.fw' => '95bc688d3e7599fd5800161e9971cc55',
);
checkstandard();
my $allfiles;
foreach my $fwfile (keys %files) {
wgetfile($fwfile, "$url/$fwfile");
verify($fwfile, $files{$fwfile});
$allfiles .= " $fwfile";
}
$allfiles =~ s/^\s//;
$allfiles;
}
sub cx23885 {
my $url = "http://linuxtv.org/downloads/firmware/";
my %files = (
'v4l-cx23885-avcore-01.fw' => 'a9f8f5d901a7fb42f552e1ee6384f3bb',
'v4l-cx23885-enc.fw' => 'a9f8f5d901a7fb42f552e1ee6384f3bb',
);
checkstandard();
my $allfiles;
foreach my $fwfile (keys %files) {
wgetfile($fwfile, "$url/$fwfile");
verify($fwfile, $files{$fwfile});
$allfiles .= " $fwfile";
}
$allfiles =~ s/^\s//;
$allfiles;
}
sub pvrusb2 {
my $url = "http://linuxtv.org/downloads/firmware/";
my %files = (
'v4l-cx25840.fw' => 'dadb79e9904fc8af96e8111d9cb59320',
);
checkstandard();
my $allfiles;
foreach my $fwfile (keys %files) {
wgetfile($fwfile, "$url/$fwfile");
verify($fwfile, $files{$fwfile});
$allfiles .= " $fwfile";
}
$allfiles =~ s/^\s//;
$allfiles;
}
sub or51132_qam {
my $fwfile = "dvb-fe-or51132-qam.fw";
my $url = "http://linuxtv.org/downloads/firmware/$fwfile";
......
Documentation/dynamic-debug-howto.txt 0 → 100644
浏览文件 @ f541ae32
Introduction
============
This document describes how to use the dynamic debug (ddebug) feature.
Dynamic debug is designed to allow you to dynamically enable/disable kernel
code to obtain additional kernel information. Currently, if
CONFIG_DYNAMIC_DEBUG is set, then all pr_debug()/dev_debug() calls can be
dynamically enabled per-callsite.
Dynamic debug has even more useful features:
* Simple query language allows turning on and off debugging statements by
matching any combination of:
- source filename
- function name
- line number (including ranges of line numbers)
- module name
- format string
* Provides a debugfs control file: <debugfs>/dynamic_debug/control which can be
read to display the complete list of known debug statements, to help guide you
Controlling dynamic debug Behaviour
===============================
The behaviour of pr_debug()/dev_debug()s are controlled via writing to a
control file in the 'debugfs' filesystem. Thus, you must first mount the debugfs
filesystem, in order to make use of this feature. Subsequently, we refer to the
control file as: <debugfs>/dynamic_debug/control. For example, if you want to
enable printing from source file 'svcsock.c', line 1603 you simply do:
nullarbor:~ # echo 'file svcsock.c line 1603 +p' >
<debugfs>/dynamic_debug/control
If you make a mistake with the syntax, the write will fail thus:
nullarbor:~ # echo 'file svcsock.c wtf 1 +p' >
<debugfs>/dynamic_debug/control
-bash: echo: write error: Invalid argument
Viewing Dynamic Debug Behaviour
===========================
You can view the currently configured behaviour of all the debug statements
via:
nullarbor:~ # cat <debugfs>/dynamic_debug/control
# filename:lineno [module]function flags format
/usr/src/packages/BUILD/sgi-enhancednfs-1.4/default/net/sunrpc/svc_rdma.c:323 [svcxprt_rdma]svc_rdma_cleanup - "SVCRDMA Module Removed, deregister RPC RDMA transport\012"
/usr/src/packages/BUILD/sgi-enhancednfs-1.4/default/net/sunrpc/svc_rdma.c:341 [svcxprt_rdma]svc_rdma_init - "\011max_inline : %d\012"
/usr/src/packages/BUILD/sgi-enhancednfs-1.4/default/net/sunrpc/svc_rdma.c:340 [svcxprt_rdma]svc_rdma_init - "\011sq_depth : %d\012"
/usr/src/packages/BUILD/sgi-enhancednfs-1.4/default/net/sunrpc/svc_rdma.c:338 [svcxprt_rdma]svc_rdma_init - "\011max_requests : %d\012"
...
You can also apply standard Unix text manipulation filters to this
data, e.g.
nullarbor:~ # grep -i rdma <debugfs>/dynamic_debug/control | wc -l
62
nullarbor:~ # grep -i tcp <debugfs>/dynamic_debug/control | wc -l
42
Note in particular that the third column shows the enabled behaviour
flags for each debug statement callsite (see below for definitions of the
flags). The default value, no extra behaviour enabled, is "-". So
you can view all the debug statement callsites with any non-default flags:
nullarbor:~ # awk '$3 != "-"' <debugfs>/dynamic_debug/control
# filename:lineno [module]function flags format
/usr/src/packages/BUILD/sgi-enhancednfs-1.4/default/net/sunrpc/svcsock.c:1603 [sunrpc]svc_send p "svc_process: st_sendto returned %d\012"
Command Language Reference
==========================
At the lexical level, a command comprises a sequence of words separated
by whitespace characters. Note that newlines are treated as word
separators and do *not* end a command or allow multiple commands to
be done together. So these are all equivalent:
nullarbor:~ # echo -c 'file svcsock.c line 1603 +p' >
<debugfs>/dynamic_debug/control
nullarbor:~ # echo -c ' file svcsock.c line 1603 +p ' >
<debugfs>/dynamic_debug/control
nullarbor:~ # echo -c 'file svcsock.c\nline 1603 +p' >
<debugfs>/dynamic_debug/control
nullarbor:~ # echo -n 'file svcsock.c line 1603 +p' >
<debugfs>/dynamic_debug/control
Commands are bounded by a write() system call. If you want to do
multiple commands you need to do a separate "echo" for each, like:
nullarbor:~ # echo 'file svcsock.c line 1603 +p' > /proc/dprintk ;\
> echo 'file svcsock.c line 1563 +p' > /proc/dprintk
or even like:
nullarbor:~ # (
> echo 'file svcsock.c line 1603 +p' ;\
> echo 'file svcsock.c line 1563 +p' ;\
> ) > /proc/dprintk
At the syntactical level, a command comprises a sequence of match
specifications, followed by a flags change specification.
command ::= match-spec* flags-spec
The match-spec's are used to choose a subset of the known dprintk()
callsites to which to apply the flags-spec. Think of them as a query
with implicit ANDs between each pair. Note that an empty list of
match-specs is possible, but is not very useful because it will not
match any debug statement callsites.
A match specification comprises a keyword, which controls the attribute
of the callsite to be compared, and a value to compare against. Possible
keywords are:
match-spec ::= 'func' string |
'file' string |
'module' string |
'format' string |
'line' line-range
line-range ::= lineno |
'-'lineno |
lineno'-' |
lineno'-'lineno
// Note: line-range cannot contain space, e.g.
// "1-30" is valid range but "1 - 30" is not.
lineno ::= unsigned-int
The meanings of each keyword are:
func
The given string is compared against the function name
of each callsite. Example:
func svc_tcp_accept
file
The given string is compared against either the full
pathname or the basename of the source file of each
callsite. Examples:
file svcsock.c
file /usr/src/packages/BUILD/sgi-enhancednfs-1.4/default/net/sunrpc/svcsock.c
module
The given string is compared against the module name
of each callsite. The module name is the string as
seen in "lsmod", i.e. without the directory or the .ko
suffix and with '-' changed to '_'. Examples:
module sunrpc
module nfsd
format
The given string is searched for in the dynamic debug format
string. Note that the string does not need to match the
entire format, only some part. Whitespace and other
special characters can be escaped using C octal character
escape \ooo notation, e.g. the space character is \040.
Alternatively, the string can be enclosed in double quote
characters (") or single quote characters (').
Examples:
format svcrdma: // many of the NFS/RDMA server dprintks
format readahead // some dprintks in the readahead cache
format nfsd:\040SETATTR // one way to match a format with whitespace
format "nfsd: SETATTR" // a neater way to match a format with whitespace
format 'nfsd: SETATTR' // yet another way to match a format with whitespace
line
The given line number or range of line numbers is compared
against the line number of each dprintk() callsite. A single
line number matches the callsite line number exactly. A
range of line numbers matches any callsite between the first
and last line number inclusive. An empty first number means
the first line in the file, an empty line number means the
last number in the file. Examples:
line 1603 // exactly line 1603
line 1600-1605 // the six lines from line 1600 to line 1605
line -1605 // the 1605 lines from line 1 to line 1605
line 1600- // all lines from line 1600 to the end of the file
The flags specification comprises a change operation followed
by one or more flag characters. The change operation is one
of the characters:
-
remove the given flags
+
add the given flags
=
set the flags to the given flags
The flags are:
p
Causes a printk() message to be emitted to dmesg
Note the regexp ^[-+=][scp]+$ matches a flags specification.
Note also that there is no convenient syntax to remove all
the flags at once, you need to use "-psc".
Examples
========
// enable the message at line 1603 of file svcsock.c
nullarbor:~ # echo -n 'file svcsock.c line 1603 +p' >
<debugfs>/dynamic_debug/control
// enable all the messages in file svcsock.c
nullarbor:~ # echo -n 'file svcsock.c +p' >
<debugfs>/dynamic_debug/control
// enable all the messages in the NFS server module
nullarbor:~ # echo -n 'module nfsd +p' >
<debugfs>/dynamic_debug/control
// enable all 12 messages in the function svc_process()
nullarbor:~ # echo -n 'func svc_process +p' >
<debugfs>/dynamic_debug/control
// disable all 12 messages in the function svc_process()
nullarbor:~ # echo -n 'func svc_process -p' >
<debugfs>/dynamic_debug/control
// enable messages for NFS calls READ, READLINK, READDIR and READDIR+.
nullarbor:~ # echo -n 'format "nfsd: READ" +p' >
<debugfs>/dynamic_debug/control
Documentation/fb/00-INDEX
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......@@ -11,8 +11,6 @@ aty128fb.txt
- info on the ATI Rage128 frame buffer driver.
cirrusfb.txt
- info on the driver for Cirrus Logic chipsets.
cyblafb/
- directory with documentation files related to the cyblafb driver.
deferred_io.txt
- an introduction to deferred IO.
fbcon.txt
......
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Bugs
====
I currently don't know of any bug. Please do send reports to:
- linux-fbdev-devel@lists.sourceforge.net
- Knut_Petersen@t-online.de.
Untested features
=================
All LCD stuff is untested. If it worked in tridentfb, it should work in
cyblafb. Please test and report the results to Knut_Petersen@t-online.de.
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Thanks to
=========
* Alan Hourihane, for writing the X trident driver
* Jani Monoses, for writing the tridentfb driver
* Antonino A. Daplas, for review of the first published
version of cyblafb and some code
* Jochen Hein, for testing and a helpfull bug report
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Available Documentation
=======================
Apollo PLE 133 Chipset VT8601A North Bridge Datasheet, Rev. 1.82, October 22,
2001, available from VIA:
http://www.viavpsd.com/product/6/15/DS8601A182.pdf
The datasheet is incomplete, some registers that need to be programmed are not
explained at all and important bits are listed as "reserved". But you really
need the datasheet to understand the code. "p. xxx" comments refer to page
numbers of this document.
XFree/XOrg drivers are available and of good quality, looking at the code
there is a good idea if the datasheet does not provide enough information
or if the datasheet seems to be wrong.
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#
# Sample fb.modes file
#
# Provides an incomplete list of working modes for
# the cyberblade/i1 graphics core.
#
# The value 4294967256 is used instead of -40. Of course, -40 is not
# a really reasonable value, but chip design does not always follow
# logic. Believe me, it's ok, and it's the way the BIOS does it.
#
# fbset requires 4294967256 in fb.modes and -40 as an argument to
# the -t parameter. That's also not too reasonable, and it might change
# in the future or might even be differt for your current version.
#
mode "640x480-50"
geometry 640 480 2048 4096 8
timings 47619 4294967256 24 17 0 216 3
endmode
mode "640x480-60"
geometry 640 480 2048 4096 8
timings 39682 4294967256 24 17 0 216 3
endmode
mode "640x480-70"
geometry 640 480 2048 4096 8
timings 34013 4294967256 24 17 0 216 3
endmode
mode "640x480-72"
geometry 640 480 2048 4096 8
timings 33068 4294967256 24 17 0 216 3
endmode
mode "640x480-75"
geometry 640 480 2048 4096 8
timings 31746 4294967256 24 17 0 216 3
endmode
mode "640x480-80"
geometry 640 480 2048 4096 8
timings 29761 4294967256 24 17 0 216 3
endmode
mode "640x480-85"
geometry 640 480 2048 4096 8
timings 28011 4294967256 24 17 0 216 3
endmode
mode "800x600-50"
geometry 800 600 2048 4096 8
timings 30303 96 24 14 0 136 11
endmode
mode "800x600-60"
geometry 800 600 2048 4096 8
timings 25252 96 24 14 0 136 11
endmode
mode "800x600-70"
geometry 800 600 2048 4096 8
timings 21645 96 24 14 0 136 11
endmode
mode "800x600-72"
geometry 800 600 2048 4096 8
timings 21043 96 24 14 0 136 11
endmode
mode "800x600-75"
geometry 800 600 2048 4096 8
timings 20202 96 24 14 0 136 11
endmode
mode "800x600-80"
geometry 800 600 2048 4096 8
timings 18939 96 24 14 0 136 11
endmode
mode "800x600-85"
geometry 800 600 2048 4096 8
timings 17825 96 24 14 0 136 11
endmode
mode "1024x768-50"
geometry 1024 768 2048 4096 8
timings 19054 144 24 29 0 120 3
endmode
mode "1024x768-60"
geometry 1024 768 2048 4096 8
timings 15880 144 24 29 0 120 3
endmode
mode "1024x768-70"
geometry 1024 768 2048 4096 8
timings 13610 144 24 29 0 120 3
endmode
mode "1024x768-72"
geometry 1024 768 2048 4096 8
timings 13232 144 24 29 0 120 3
endmode
mode "1024x768-75"
geometry 1024 768 2048 4096 8
timings 12703 144 24 29 0 120 3
endmode
mode "1024x768-80"
geometry 1024 768 2048 4096 8
timings 11910 144 24 29 0 120 3
endmode
mode "1024x768-85"
geometry 1024 768 2048 4096 8
timings 11209 144 24 29 0 120 3
endmode
mode "1280x1024-50"
geometry 1280 1024 2048 4096 8
timings 11114 232 16 39 0 160 3
endmode
mode "1280x1024-60"
geometry 1280 1024 2048 4096 8
timings 9262 232 16 39 0 160 3
endmode
mode "1280x1024-70"
geometry 1280 1024 2048 4096 8
timings 7939 232 16 39 0 160 3
endmode
mode "1280x1024-72"
geometry 1280 1024 2048 4096 8
timings 7719 232 16 39 0 160 3
endmode
mode "1280x1024-75"
geometry 1280 1024 2048 4096 8
timings 7410 232 16 39 0 160 3
endmode
mode "1280x1024-80"
geometry 1280 1024 2048 4096 8
timings 6946 232 16 39 0 160 3
endmode
mode "1280x1024-85"
geometry 1280 1024 2048 4096 8
timings 6538 232 16 39 0 160 3
endmode
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Speed
=====
CyBlaFB is much faster than tridentfb and vesafb. Compare the performance data
for mode 1280x1024-[8,16,32]@61 Hz.
Test 1: Cat a file with 2000 lines of 0 characters.
Test 2: Cat a file with 2000 lines of 80 characters.
Test 3: Cat a file with 2000 lines of 160 characters.
All values show system time use in seconds, kernel 2.6.12 was used for
the measurements. 2.6.13 is a bit slower, 2.6.14 hopefully will include a
patch that speeds up kernel bitblitting a lot ( > 20%).
+-----------+-----------------------------------------------------+
| | not accelerated |
| TRIDENTFB +-----------------+-----------------+-----------------+
| of 2.6.12 | 8 bpp | 16 bpp | 32 bpp |
| | noypan | ypan | noypan | ypan | noypan | ypan |
+-----------+--------+--------+--------+--------+--------+--------+
| Test 1 | 4.31 | 4.33 | 6.05 | 12.81 | ---- | ---- |
| Test 2 | 67.94 | 5.44 | 123.16 | 14.79 | ---- | ---- |
| Test 3 | 131.36 | 6.55 | 240.12 | 16.76 | ---- | ---- |
+-----------+--------+--------+--------+--------+--------+--------+
| Comments | | | completely bro- |
| | | | ken, monitor |
| | | | switches off |
+-----------+-----------------+-----------------+-----------------+
+-----------+-----------------------------------------------------+
| | accelerated |
| TRIDENTFB +-----------------+-----------------+-----------------+
| of 2.6.12 | 8 bpp | 16 bpp | 32 bpp |
| | noypan | ypan | noypan | ypan | noypan | ypan |
+-----------+--------+--------+--------+--------+--------+--------+
| Test 1 | ---- | ---- | 20.62 | 1.22 | ---- | ---- |
| Test 2 | ---- | ---- | 22.61 | 3.19 | ---- | ---- |
| Test 3 | ---- | ---- | 24.59 | 5.16 | ---- | ---- |
+-----------+--------+--------+--------+--------+--------+--------+
| Comments | broken, writing | broken, ok only | completely bro- |
| | to wrong places | if bgcolor is | ken, monitor |
| | on screen + bug | black, bug in | switches off |
| | in fillrect() | fillrect() | |
+-----------+-----------------+-----------------+-----------------+
+-----------+-----------------------------------------------------+
| | not accelerated |
| VESAFB +-----------------+-----------------+-----------------+
| of 2.6.12 | 8 bpp | 16 bpp | 32 bpp |
| | noypan | ypan | noypan | ypan | noypan | ypan |
+-----------+--------+--------+--------+--------+--------+--------+
| Test 1 | 4.26 | 3.76 | 5.99 | 7.23 | ---- | ---- |
| Test 2 | 65.65 | 4.89 | 120.88 | 9.08 | ---- | ---- |
| Test 3 | 126.91 | 5.94 | 235.77 | 11.03 | ---- | ---- |
+-----------+--------+--------+--------+--------+--------+--------+
| Comments | vga=0x307 | vga=0x31a | vga=0x31b not |
| | fh=80kHz | fh=80kHz | supported by |
| | fv=75kHz | fv=75kHz | video BIOS and |
| | | | hardware |
+-----------+-----------------+-----------------+-----------------+
+-----------+-----------------------------------------------------+
| | accelerated |
| CYBLAFB +-----------------+-----------------+-----------------+
| | 8 bpp | 16 bpp | 32 bpp |
| | noypan | ypan | noypan | ypan | noypan | ypan |
+-----------+--------+--------+--------+--------+--------+--------+
| Test 1 | 8.02 | 0.23 | 19.04 | 0.61 | 57.12 | 2.74 |
| Test 2 | 8.38 | 0.55 | 19.39 | 0.92 | 57.54 | 3.13 |
| Test 3 | 8.73 | 0.86 | 19.74 | 1.24 | 57.95 | 3.51 |
+-----------+--------+--------+--------+--------+--------+--------+
| Comments | | | |
| | | | |
| | | | |
| | | | |
+-----------+-----------------+-----------------+-----------------+
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TODO / Missing features
=======================
Verify LCD stuff "stretch" and "center" options are
completely untested ... this code needs to be
verified. As I don't have access to such
hardware, please contact me if you are
willing run some tests.
Interlaced video modes The reason that interleaved
modes are disabled is that I do not know
the meaning of the vertical interlace
parameter. Also the datasheet mentions a
bit d8 of a horizontal interlace parameter,
but nowhere the lower 8 bits. Please help
if you can.
low-res double scan modes Who needs it?
accelerated color blitting Who needs it? The console driver does use color
blitting for nothing but drawing the penguine,
everything else is done using color expanding
blitting of 1bpp character bitmaps.
ioctls Who needs it?
TV-out Will be done later. Use "vga= " at boot time
to set a suitable video mode.
??? Feel free to contact me if you have any
feature requests
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CyBlaFB is a framebuffer driver for the Cyberblade/i1 graphics core integrated
into the VIA Apollo PLE133 (aka vt8601) south bridge. It is developed and
tested using a VIA EPIA 5000 board.
Cyblafb - compiled into the kernel or as a module?
==================================================
You might compile cyblafb either as a module or compile it permanently into the
kernel.
Unless you have a real reason to do so you should not compile both vesafb and
cyblafb permanently into the kernel. It's possible and it helps during the
developement cycle, but it's useless and will at least block some otherwise
usefull memory for ordinary users.
Selecting Modes
===============
Startup Mode
============
First of all, you might use the "vga=???" boot parameter as it is
documented in vesafb.txt and svga.txt. Cyblafb will detect the video
mode selected and will use the geometry and timings found by
inspecting the hardware registers.
video=cyblafb vga=0x317
Alternatively you might use a combination of the mode, ref and bpp
parameters. If you compiled the driver into the kernel, add something
like this to the kernel command line:
video=cyblafb:1280x1024,bpp=16,ref=50 ...
If you compiled the driver as a module, the same mode would be
selected by the following command:
modprobe cyblafb mode=1280x1024 bpp=16 ref=50 ...
None of the modes possible to select as startup modes are affected by
the problems described at the end of the next subsection.
For all startup modes cyblafb chooses a virtual x resolution of 2048,
the only exception is mode 1280x1024 in combination with 32 bpp. This
allows ywrap scrolling for all those modes if rotation is 0 or 2, and
also fast scrolling if rotation is 1 or 3. The default virtual y reso-
lution is 4096 for bpp == 8, 2048 for bpp==16 and 1024 for bpp == 32,
again with the only exception of 1280x1024 at 32 bpp.
Please do set your video memory size to 8 Mb in the Bios setup. Other
values will work, but performace is decreased for a lot of modes.
Mode changes using fbset
========================
You might use fbset to change the video mode, see "man fbset". Cyblafb
generally does assume that you know what you are doing. But it does
some checks, especially those that are needed to prevent you from
damaging your hardware.
- only 8, 16, 24 and 32 bpp video modes are accepted
- interlaced video modes are not accepted
- double scan video modes are not accepted
- if a flat panel is found, cyblafb does not allow you
to program a resolution higher than the physical
resolution of the flat panel monitor
- cyblafb does not allow vclk to exceed 230 MHz. As 32 bpp
and (currently) 24 bit modes use a doubled vclk internally,
the dotclock limit as seen by fbset is 115 MHz for those
modes and 230 MHz for 8 and 16 bpp modes.
- cyblafb will allow you to select very high resolutions as
long as the hardware can be programmed to these modes. The
documented limit 1600x1200 is not enforced, but don't expect
perfect signal quality.
Any request that violates the rules given above will be either changed
to something the hardware supports or an error value will be returned.
If you program a virtual y resolution higher than the hardware limit,
cyblafb will silently decrease that value to the highest possible
value. The same is true for a virtual x resolution that is not
supported by the hardware. Cyblafb tries to adapt vyres first because
vxres decides if ywrap scrolling is possible or not.
Attempts to disable acceleration are ignored, I believe that this is
safe.
Some video modes that should work do not work as expected. If you use
the standard fb.modes, fbset 640x480-60 will program that mode, but
you will see a vertical area, about two characters wide, with only
much darker characters than the other characters on the screen.
Cyblafb does allow that mode to be set, as it does not violate the
official specifications. It would need a lot of code to reliably sort
out all invalid modes, playing around with the margin values will
give a valid mode quickly. And if cyblafb would detect such an invalid
mode, should it silently alter the requested values or should it
report an error? Both options have some pros and cons. As stated
above, none of the startup modes are affected, and if you set
verbosity to 1 or higher, cyblafb will print the fbset command that
would be needed to program that mode using fbset.
Other Parameters
================
crt don't autodetect, assume monitor connected to
standard VGA connector
fp don't autodetect, assume flat panel display
connected to flat panel monitor interface
nativex inform driver about native x resolution of
flat panel monitor connected to special
interface (should be autodetected)
stretch stretch image to adapt low resolution modes to
higer resolutions of flat panel monitors
connected to special interface
center center image to adapt low resolution modes to
higer resolutions of flat panel monitors
connected to special interface
memsize use if autodetected memsize is wrong ...
should never be necessary
nopcirr disable PCI read retry
nopciwr disable PCI write retry
nopcirb disable PCI read bursts
nopciwb disable PCI write bursts
bpp bpp for specified modes
valid values: 8 || 16 || 24 || 32
ref refresh rate for specified mode
valid values: 50 <= ref <= 85
mode 640x480 or 800x600 or 1024x768 or 1280x1024
if not specified, the startup mode will be detected
and used, so you might also use the vga=??? parameter
described in vesafb.txt. If you do not specify a mode,
bpp and ref parameters are ignored.
verbosity 0 is the default, increase to at least 2 for every
bug report!
Development hints
=================
It's much faster do compile a module and to load the new version after
unloading the old module than to compile a new kernel and to reboot. So if you
try to work on cyblafb, it might be a good idea to use cyblafb as a module.
In real life, fast often means dangerous, and that's also the case here. If
you introduce a serious bug when cyblafb is compiled into the kernel, the
kernel will lock or oops with a high probability before the file system is
mounted, and the danger for your data is low. If you load a broken own version
of cyblafb on a running system, the danger for the integrity of the file
system is much higher as you might need a hard reset afterwards. Decide
yourself.
Module unloading, the vfb method
================================
If you want to unload/reload cyblafb using the virtual framebuffer, you need
to enable vfb support in the kernel first. After that, load the modules as
shown below:
modprobe vfb vfb_enable=1
modprobe fbcon
modprobe cyblafb
fbset -fb /dev/fb1 1280x1024-60 -vyres 2662
con2fb /dev/fb1 /dev/tty1
...
If you now made some changes to cyblafb and want to reload it, you might do it
as show below:
con2fb /dev/fb0 /dev/tty1
...
rmmod cyblafb
modprobe cyblafb
con2fb /dev/fb1 /dev/tty1
...
Of course, you might choose another mode, and most certainly you also want to
map some other /dev/tty* to the real framebuffer device. You might also choose
to compile fbcon as a kernel module or place it permanently in the kernel.
I do not know of any way to unload fbcon, and fbcon will prevent the
framebuffer device loaded first from unloading. [If there is a way, then
please add a description here!]
Module unloading, the vesafb method
===================================
Configure the kernel:
<*> Support for frame buffer devices
[*] VESA VGA graphics support
<M> Cyberblade/i1 support
Add e.g. "video=vesafb:ypan vga=0x307" to the kernel parameters. The ypan
parameter is important, choose any vga parameter you like as long as it is
a graphics mode.
After booting, load cyblafb without any mode and bpp parameter and assign
cyblafb to individual ttys using con2fb, e.g.:
modprobe cyblafb
con2fb /dev/fb1 /dev/tty1
Unloading cyblafb works without problems after you assign vesafb to all
ttys again, e.g.:
con2fb /dev/fb0 /dev/tty1
rmmod cyblafb
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0.62
====
- the vesafb parameter has been removed as I decided to allow the
feature without any special parameter.
- Cyblafb does not use the vga style of panning any longer, now the
"right view" register in the graphics engine IO space is used. Without
that change it was impossible to use all available memory, and without
access to all available memory it is impossible to ywrap.
- The imageblit function now uses hardware acceleration for all font
widths. Hardware blitting across pixel column 2048 is broken in the
cyberblade/i1 graphics core, but we work around that hardware bug.
- modes with vxres != xres are supported now.
- ywrap scrolling is supported now and the default. This is a big
performance gain.
- default video modes use vyres > yres and vxres > xres to allow
almost optimal scrolling speed for normal and rotated screens
- some features mainly usefull for debugging the upper layers of the
framebuffer system have been added, have a look at the code
- fixed: Oops after unloading cyblafb when reading /proc/io*
- we work around some bugs of the higher framebuffer layers.
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I tried the following framebuffer drivers:
- TRIDENTFB is full of bugs. Acceleration is broken for Blade3D
graphics cores like the cyberblade/i1. It claims to support a great
number of devices, but documentation for most of these devices is
unfortunately not available. There is _no_ reason to use tridentfb
for cyberblade/i1 + CRT users. VESAFB is faster, and the one
advantage, mode switching, is broken in tridentfb.
- VESAFB is used by many distributions as a standard. Vesafb does
not support mode switching. VESAFB is a bit faster than the working
configurations of TRIDENTFB, but it is still too slow, even if you
use ypan.
- EPIAFB (you'll find it on sourceforge) supports the Cyberblade/i1
graphics core, but it still has serious bugs and developement seems
to have stopped. This is the one driver with TV-out support. If you
do need this feature, try epiafb.
None of these drivers was a real option for me.
I believe that is unreasonable to change code that announces to support 20
devices if I only have more or less sufficient documentation for exactly one
of these. The risk of breaking device foo while fixing device bar is too high.
So I decided to start CyBlaFB as a stripped down tridentfb.
All code specific to other Trident chips has been removed. After that there
were a lot of cosmetic changes to increase the readability of the code. All
register names were changed to those mnemonics used in the datasheet. Function
and macro names were changed if they hindered easy understanding of the code.
After that I debugged the code and implemented some new features. I'll try to
give a little summary of the main changes:
- calculation of vertical and horizontal timings was fixed
- video signal quality has been improved dramatically
- acceleration:
- fillrect and copyarea were fixed and reenabled
- color expanding imageblit was newly implemented, color
imageblit (only used to draw the penguine) still uses the
generic code.
- init of the acceleration engine was improved and moved to a
place where it really works ...
- sync function has a timeout now and tries to reset and
reinit the accel engine if necessary
- fewer slow copyarea calls when doing ypan scrolling by using
undocumented bit d21 of screen start address stored in
CR2B[5]. BIOS does use it also, so this should be safe.
- cyblafb rejects any attempt to set modes that would cause vclk
values above reasonable 230 MHz. 32bit modes use a clock
multiplicator of 2, so fbset does show the correct values for
pixclock but not for vclk in this case. The fbset limit is 115 MHz
for 32 bpp modes.
- cyblafb rejects modes known to be broken or unimplemented (all
interlaced modes, all doublescan modes for now)
- cyblafb now works independant of the video mode in effect at startup
time (tridentfb does not init all needed registers to reasonable
values)
- switching between video modes does work reliably now
- the first video mode now is the one selected on startup using the
vga=???? mechanism or any of
- 640x480, 800x600, 1024x768, 1280x1024
- 8, 16, 24 or 32 bpp
- refresh between 50 Hz and 85 Hz, 1 Hz steps (1280x1024-32
is limited to 63Hz)
- pci retry and pci burst mode are settable (try to disable if you
experience latency problems)
- built as a module cyblafb might be unloaded and reloaded using
the vfb module and con2vt or might be used together with vesafb
Documentation/feature-removal-schedule.txt
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......@@ -6,20 +6,47 @@ be removed from this file.
---------------------------
What: old static regulatory information and ieee80211_regdom module parameter
When: 2.6.29
What: The ieee80211_regdom module parameter
When: March 2010 / desktop catchup
Why: This was inherited by the CONFIG_WIRELESS_OLD_REGULATORY code,
and currently serves as an option for users to define an
ISO / IEC 3166 alpha2 code for the country they are currently
present in. Although there are userspace API replacements for this
through nl80211 distributions haven't yet caught up with implementing
decent alternatives through standard GUIs. Although available as an
option through iw or wpa_supplicant its just a matter of time before
distributions pick up good GUI options for this. The ideal solution
would actually consist of intelligent designs which would do this for
the user automatically even when travelling through different countries.
Until then we leave this module parameter as a compromise.
When userspace improves with reasonable widely-available alternatives for
this we will no longer need this module parameter. This entry hopes that
by the super-futuristically looking date of "March 2010" we will have
such replacements widely available.
Who: Luis R. Rodriguez <lrodriguez@atheros.com>
---------------------------
What: CONFIG_WIRELESS_OLD_REGULATORY - old static regulatory information
When: March 2010 / desktop catchup
Why: The old regulatory infrastructure has been replaced with a new one
which does not require statically defined regulatory domains. We do
not want to keep static regulatory domains in the kernel due to the
the dynamic nature of regulatory law and localization. We kept around
the old static definitions for the regulatory domains of:
* US
* JP
* EU
and used by default the US when CONFIG_WIRELESS_OLD_REGULATORY was
set. We also kept around the ieee80211_regdom module parameter in case
some applications were relying on it. Changing regulatory domains
can now be done instead by using nl80211, as is done with iw.
set. We will remove this option once the standard Linux desktop catches
up with the new userspace APIs we have implemented.
Who: Luis R. Rodriguez <lrodriguez@atheros.com>
---------------------------
......@@ -37,10 +64,10 @@ Who: Pavel Machek <pavel@suse.cz>
---------------------------
What: Video4Linux API 1 ioctls and video_decoder.h from Video devices.
When: December 2008
Files: include/linux/video_decoder.h include/linux/videodev.h
Check: include/linux/video_decoder.h include/linux/videodev.h
What: Video4Linux API 1 ioctls and from Video devices.
When: July 2009
Files: include/linux/videodev.h
Check: include/linux/videodev.h
Why: V4L1 AP1 was replaced by V4L2 API during migration from 2.4 to 2.6
series. The old API have lots of drawbacks and don't provide enough
means to work with all video and audio standards. The newer API is
......@@ -228,8 +255,20 @@ Who: Jan Engelhardt <jengelh@computergmbh.de>
---------------------------
What: GPIO autorequest on gpio_direction_{input,output}() in gpiolib
When: February 2010
Why: All callers should use explicit gpio_request()/gpio_free().
The autorequest mechanism in gpiolib was provided mostly as a
migration aid for legacy GPIO interfaces (for SOC based GPIOs).
Those users have now largely migrated. Platforms implementing
the GPIO interfaces without using gpiolib will see no changes.
Who: David Brownell <dbrownell@users.sourceforge.net>
---------------------------
What: b43 support for firmware revision < 410
When: July 2008
When: The schedule was July 2008, but it was decided that we are going to keep the
code as long as there are no major maintanance headaches.
So it _could_ be removed _any_ time now, if it conflicts with something new.
Why: The support code for the old firmware hurts code readability/maintainability
and slightly hurts runtime performance. Bugfixes for the old firmware
are not provided by Broadcom anymore.
......@@ -244,13 +283,6 @@ Who: Glauber Costa <gcosta@redhat.com>
---------------------------
What: remove HID compat support
When: 2.6.29
Why: needed only as a temporary solution until distros fix themselves up
Who: Jiri Slaby <jirislaby@gmail.com>
---------------------------
What: print_fn_descriptor_symbol()
When: October 2009
Why: The %pF vsprintf format provides the same functionality in a
......@@ -282,6 +314,18 @@ Who: Vlad Yasevich <vladislav.yasevich@hp.com>
---------------------------
What: Ability for non root users to shm_get hugetlb pages based on mlock
resource limits
When: 2.6.31
Why: Non root users need to be part of /proc/sys/vm/hugetlb_shm_group or
have CAP_IPC_LOCK to be able to allocate shm segments backed by
huge pages. The mlock based rlimit check to allow shm hugetlb is
inconsistent with mmap based allocations. Hence it is being
deprecated.
Who: Ravikiran Thirumalai <kiran@scalex86.org>
---------------------------
What: CONFIG_THERMAL_HWMON
When: January 2009
Why: This option was introduced just to allow older lm-sensors userspace
......@@ -311,7 +355,8 @@ Who: Krzysztof Piotr Oledzki <ole@ans.pl>
---------------------------
What: i2c_attach_client(), i2c_detach_client(), i2c_driver->detach_client()
When: 2.6.29 (ideally) or 2.6.30 (more likely)
When: 2.6.30
Check: i2c_attach_client i2c_detach_client
Why: Deprecated by the new (standard) device driver binding model. Use
i2c_driver->probe() and ->remove() instead.
Who: Jean Delvare <khali@linux-fr.org>
......@@ -326,12 +371,59 @@ Who: Hans de Goede <hdegoede@redhat.com>
---------------------------
What: SELinux "compat_net" functionality
When: 2.6.30 at the earliest
Why: In 2.6.18 the Secmark concept was introduced to replace the "compat_net"
network access control functionality of SELinux. Secmark offers both
better performance and greater flexibility than the "compat_net"
mechanism. Now that the major Linux distributions have moved to
Secmark, it is time to deprecate the older mechanism and start the
process of removing the old code.
Who: Paul Moore <paul.moore@hp.com>
What: sysfs ui for changing p4-clockmod parameters
When: September 2009
Why: See commits 129f8ae9b1b5be94517da76009ea956e89104ce8 and
e088e4c9cdb618675874becb91b2fd581ee707e6.
Removal is subject to fixing any remaining bugs in ACPI which may
cause the thermal throttling not to happen at the right time.
Who: Dave Jones <davej@redhat.com>, Matthew Garrett <mjg@redhat.com>
-----------------------------
What: __do_IRQ all in one fits nothing interrupt handler
When: 2.6.32
Why: __do_IRQ was kept for easy migration to the type flow handlers.
More than two years of migration time is enough.
Who: Thomas Gleixner <tglx@linutronix.de>
-----------------------------
What: obsolete generic irq defines and typedefs
When: 2.6.30
Why: The defines and typedefs (hw_interrupt_type, no_irq_type, irq_desc_t)
have been kept around for migration reasons. After more than two years
it's time to remove them finally
Who: Thomas Gleixner <tglx@linutronix.de>
---------------------------
What: fakephp and associated sysfs files in /sys/bus/pci/slots/
When: 2011
Why: In 2.6.27, the semantics of /sys/bus/pci/slots was redefined to
represent a machine's physical PCI slots. The change in semantics
had userspace implications, as the hotplug core no longer allowed
drivers to create multiple sysfs files per physical slot (required
for multi-function devices, e.g.). fakephp was seen as a developer's
tool only, and its interface changed. Too late, we learned that
there were some users of the fakephp interface.
In 2.6.30, the original fakephp interface was restored. At the same
time, the PCI core gained the ability that fakephp provided, namely
function-level hot-remove and hot-add.
Since the PCI core now provides the same functionality, exposed in:
/sys/bus/pci/rescan
/sys/bus/pci/devices/.../remove
/sys/bus/pci/devices/.../rescan
there is no functional reason to maintain fakephp as well.
We will keep the existing module so that 'modprobe fakephp' will
present the old /sys/bus/pci/slots/... interface for compatibility,
but users are urged to migrate their applications to the API above.
After a reasonable transition period, we will remove the legacy
fakephp interface.
Who: Alex Chiang <achiang@hp.com>
Documentation/filesystems/Locking
浏览文件 @ f541ae32
......@@ -437,8 +437,11 @@ grab BKL for cases when we close a file that had been opened r/w, but that
can and should be done using the internal locking with smaller critical areas).
Current worst offender is ext2_get_block()...
->fasync() is a mess. This area needs a big cleanup and that will probably
affect locking.
->fasync() is called without BKL protection, and is responsible for
maintaining the FASYNC bit in filp->f_flags. Most instances call
fasync_helper(), which does that maintenance, so it's not normally
something one needs to worry about. Return values > 0 will be mapped to
zero in the VFS layer.
->readdir() and ->ioctl() on directories must be changed. Ideally we would
move ->readdir() to inode_operations and use a separate method for directory
......@@ -502,7 +505,7 @@ prototypes:
void (*open)(struct vm_area_struct*);
void (*close)(struct vm_area_struct*);
int (*fault)(struct vm_area_struct*, struct vm_fault *);
int (*page_mkwrite)(struct vm_area_struct *, struct page *);
int (*page_mkwrite)(struct vm_area_struct *, struct vm_fault *);
int (*access)(struct vm_area_struct *, unsigned long, void*, int, int);
locking rules:
......
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===============================================
CacheFiles: CACHE ON ALREADY MOUNTED FILESYSTEM
===============================================
Contents:
(*) Overview.
(*) Requirements.
(*) Configuration.
(*) Starting the cache.
(*) Things to avoid.
(*) Cache culling.
(*) Cache structure.
(*) Security model and SELinux.
(*) A note on security.
(*) Statistical information.
(*) Debugging.
========
OVERVIEW
========
CacheFiles is a caching backend that's meant to use as a cache a directory on
an already mounted filesystem of a local type (such as Ext3).
CacheFiles uses a userspace daemon to do some of the cache management - such as
reaping stale nodes and culling. This is called cachefilesd and lives in
/sbin.
The filesystem and data integrity of the cache are only as good as those of the
filesystem providing the backing services. Note that CacheFiles does not
attempt to journal anything since the journalling interfaces of the various
filesystems are very specific in nature.
CacheFiles creates a misc character device - "/dev/cachefiles" - that is used
to communication with the daemon. Only one thing may have this open at once,
and whilst it is open, a cache is at least partially in existence. The daemon
opens this and sends commands down it to control the cache.
CacheFiles is currently limited to a single cache.
CacheFiles attempts to maintain at least a certain percentage of free space on
the filesystem, shrinking the cache by culling the objects it contains to make
space if necessary - see the "Cache Culling" section. This means it can be
placed on the same medium as a live set of data, and will expand to make use of
spare space and automatically contract when the set of data requires more
space.
============
REQUIREMENTS
============
The use of CacheFiles and its daemon requires the following features to be
available in the system and in the cache filesystem:
- dnotify.
- extended attributes (xattrs).
- openat() and friends.
- bmap() support on files in the filesystem (FIBMAP ioctl).
- The use of bmap() to detect a partial page at the end of the file.
It is strongly recommended that the "dir_index" option is enabled on Ext3
filesystems being used as a cache.
=============
CONFIGURATION
=============
The cache is configured by a script in /etc/cachefilesd.conf. These commands
set up cache ready for use. The following script commands are available:
(*) brun <N>%
(*) bcull <N>%
(*) bstop <N>%
(*) frun <N>%
(*) fcull <N>%
(*) fstop <N>%
Configure the culling limits. Optional. See the section on culling
The defaults are 7% (run), 5% (cull) and 1% (stop) respectively.
The commands beginning with a 'b' are file space (block) limits, those
beginning with an 'f' are file count limits.
(*) dir <path>
Specify the directory containing the root of the cache. Mandatory.
(*) tag <name>
Specify a tag to FS-Cache to use in distinguishing multiple caches.
Optional. The default is "CacheFiles".
(*) debug <mask>
Specify a numeric bitmask to control debugging in the kernel module.
Optional. The default is zero (all off). The following values can be
OR'd into the mask to collect various information:
1 Turn on trace of function entry (_enter() macros)
2 Turn on trace of function exit (_leave() macros)
4 Turn on trace of internal debug points (_debug())
This mask can also be set through sysfs, eg:
echo 5 >/sys/modules/cachefiles/parameters/debug
==================
STARTING THE CACHE
==================
The cache is started by running the daemon. The daemon opens the cache device,
configures the cache and tells it to begin caching. At that point the cache
binds to fscache and the cache becomes live.
The daemon is run as follows:
/sbin/cachefilesd [-d]* [-s] [-n] [-f <configfile>]
The flags are:
(*) -d
Increase the debugging level. This can be specified multiple times and
is cumulative with itself.
(*) -s
Send messages to stderr instead of syslog.
(*) -n
Don't daemonise and go into background.
(*) -f <configfile>
Use an alternative configuration file rather than the default one.
===============
THINGS TO AVOID
===============
Do not mount other things within the cache as this will cause problems. The
kernel module contains its own very cut-down path walking facility that ignores
mountpoints, but the daemon can't avoid them.
Do not create, rename or unlink files and directories in the cache whilst the
cache is active, as this may cause the state to become uncertain.
Renaming files in the cache might make objects appear to be other objects (the
filename is part of the lookup key).
Do not change or remove the extended attributes attached to cache files by the
cache as this will cause the cache state management to get confused.
Do not create files or directories in the cache, lest the cache get confused or
serve incorrect data.
Do not chmod files in the cache. The module creates things with minimal
permissions to prevent random users being able to access them directly.
=============
CACHE CULLING
=============
The cache may need culling occasionally to make space. This involves
discarding objects from the cache that have been used less recently than
anything else. Culling is based on the access time of data objects. Empty
directories are culled if not in use.
Cache culling is done on the basis of the percentage of blocks and the
percentage of files available in the underlying filesystem. There are six
"limits":
(*) brun
(*) frun
If the amount of free space and the number of available files in the cache
rises above both these limits, then culling is turned off.
(*) bcull
(*) fcull
If the amount of available space or the number of available files in the
cache falls below either of these limits, then culling is started.
(*) bstop
(*) fstop
If the amount of available space or the number of available files in the
cache falls below either of these limits, then no further allocation of
disk space or files is permitted until culling has raised things above
these limits again.
These must be configured thusly:
0 <= bstop < bcull < brun < 100
0 <= fstop < fcull < frun < 100
Note that these are percentages of available space and available files, and do
_not_ appear as 100 minus the percentage displayed by the "df" program.
The userspace daemon scans the cache to build up a table of cullable objects.
These are then culled in least recently used order. A new scan of the cache is
started as soon as space is made in the table. Objects will be skipped if
their atimes have changed or if the kernel module says it is still using them.
===============
CACHE STRUCTURE
===============
The CacheFiles module will create two directories in the directory it was
given:
(*) cache/
(*) graveyard/
The active cache objects all reside in the first directory. The CacheFiles
kernel module moves any retired or culled objects that it can't simply unlink
to the graveyard from which the daemon will actually delete them.
The daemon uses dnotify to monitor the graveyard directory, and will delete
anything that appears therein.
The module represents index objects as directories with the filename "I..." or
"J...". Note that the "cache/" directory is itself a special index.
Data objects are represented as files if they have no children, or directories
if they do. Their filenames all begin "D..." or "E...". If represented as a
directory, data objects will have a file in the directory called "data" that
actually holds the data.
Special objects are similar to data objects, except their filenames begin
"S..." or "T...".
If an object has children, then it will be represented as a directory.
Immediately in the representative directory are a collection of directories
named for hash values of the child object keys with an '@' prepended. Into
this directory, if possible, will be placed the representations of the child
objects:
INDEX INDEX INDEX DATA FILES
========= ========== ================================= ================
cache/@4a/I03nfs/@30/Ji000000000000000--fHg8hi8400
cache/@4a/I03nfs/@30/Ji000000000000000--fHg8hi8400/@75/Es0g000w...DB1ry
cache/@4a/I03nfs/@30/Ji000000000000000--fHg8hi8400/@75/Es0g000w...N22ry
cache/@4a/I03nfs/@30/Ji000000000000000--fHg8hi8400/@75/Es0g000w...FP1ry
If the key is so long that it exceeds NAME_MAX with the decorations added on to
it, then it will be cut into pieces, the first few of which will be used to
make a nest of directories, and the last one of which will be the objects
inside the last directory. The names of the intermediate directories will have
'+' prepended:
J1223/@23/+xy...z/+kl...m/Epqr
Note that keys are raw data, and not only may they exceed NAME_MAX in size,
they may also contain things like '/' and NUL characters, and so they may not
be suitable for turning directly into a filename.
To handle this, CacheFiles will use a suitably printable filename directly and
"base-64" encode ones that aren't directly suitable. The two versions of
object filenames indicate the encoding:
OBJECT TYPE PRINTABLE ENCODED
=============== =============== ===============
Index "I..." "J..."
Data "D..." "E..."
Special "S..." "T..."
Intermediate directories are always "@" or "+" as appropriate.
Each object in the cache has an extended attribute label that holds the object
type ID (required to distinguish special objects) and the auxiliary data from
the netfs. The latter is used to detect stale objects in the cache and update
or retire them.
Note that CacheFiles will erase from the cache any file it doesn't recognise or
any file of an incorrect type (such as a FIFO file or a device file).
==========================
SECURITY MODEL AND SELINUX
==========================
CacheFiles is implemented to deal properly with the LSM security features of
the Linux kernel and the SELinux facility.
One of the problems that CacheFiles faces is that it is generally acting on
behalf of a process, and running in that process's context, and that includes a
security context that is not appropriate for accessing the cache - either
because the files in the cache are inaccessible to that process, or because if
the process creates a file in the cache, that file may be inaccessible to other
processes.
The way CacheFiles works is to temporarily change the security context (fsuid,
fsgid and actor security label) that the process acts as - without changing the
security context of the process when it the target of an operation performed by
some other process (so signalling and suchlike still work correctly).
When the CacheFiles module is asked to bind to its cache, it:
(1) Finds the security label attached to the root cache directory and uses
that as the security label with which it will create files. By default,
this is:
cachefiles_var_t
(2) Finds the security label of the process which issued the bind request
(presumed to be the cachefilesd daemon), which by default will be:
cachefilesd_t
and asks LSM to supply a security ID as which it should act given the
daemon's label. By default, this will be:
cachefiles_kernel_t
SELinux transitions the daemon's security ID to the module's security ID
based on a rule of this form in the policy.
type_transition <daemon's-ID> kernel_t : process <module's-ID>;
For instance:
type_transition cachefilesd_t kernel_t : process cachefiles_kernel_t;
The module's security ID gives it permission to create, move and remove files
and directories in the cache, to find and access directories and files in the
cache, to set and access extended attributes on cache objects, and to read and
write files in the cache.
The daemon's security ID gives it only a very restricted set of permissions: it
may scan directories, stat files and erase files and directories. It may
not read or write files in the cache, and so it is precluded from accessing the
data cached therein; nor is it permitted to create new files in the cache.
There are policy source files available in:
http://people.redhat.com/~dhowells/fscache/cachefilesd-0.8.tar.bz2
and later versions. In that tarball, see the files:
cachefilesd.te
cachefilesd.fc
cachefilesd.if
They are built and installed directly by the RPM.
If a non-RPM based system is being used, then copy the above files to their own
directory and run:
make -f /usr/share/selinux/devel/Makefile
semodule -i cachefilesd.pp
You will need checkpolicy and selinux-policy-devel installed prior to the
build.
By default, the cache is located in /var/fscache, but if it is desirable that
it should be elsewhere, than either the above policy files must be altered, or
an auxiliary policy must be installed to label the alternate location of the
cache.
For instructions on how to add an auxiliary policy to enable the cache to be
located elsewhere when SELinux is in enforcing mode, please see:
/usr/share/doc/cachefilesd-*/move-cache.txt
When the cachefilesd rpm is installed; alternatively, the document can be found
in the sources.
==================
A NOTE ON SECURITY
==================
CacheFiles makes use of the split security in the task_struct. It allocates
its own task_security structure, and redirects current->act_as to point to it
when it acts on behalf of another process, in that process's context.
The reason it does this is that it calls vfs_mkdir() and suchlike rather than
bypassing security and calling inode ops directly. Therefore the VFS and LSM
may deny the CacheFiles access to the cache data because under some
circumstances the caching code is running in the security context of whatever
process issued the original syscall on the netfs.
Furthermore, should CacheFiles create a file or directory, the security
parameters with that object is created (UID, GID, security label) would be
derived from that process that issued the system call, thus potentially
preventing other processes from accessing the cache - including CacheFiles's
cache management daemon (cachefilesd).
What is required is to temporarily override the security of the process that
issued the system call. We can't, however, just do an in-place change of the
security data as that affects the process as an object, not just as a subject.
This means it may lose signals or ptrace events for example, and affects what
the process looks like in /proc.
So CacheFiles makes use of a logical split in the security between the
objective security (task->sec) and the subjective security (task->act_as). The
objective security holds the intrinsic security properties of a process and is
never overridden. This is what appears in /proc, and is what is used when a
process is the target of an operation by some other process (SIGKILL for
example).
The subjective security holds the active security properties of a process, and
may be overridden. This is not seen externally, and is used whan a process
acts upon another object, for example SIGKILLing another process or opening a
file.
LSM hooks exist that allow SELinux (or Smack or whatever) to reject a request
for CacheFiles to run in a context of a specific security label, or to create
files and directories with another security label.
=======================
STATISTICAL INFORMATION
=======================
If FS-Cache is compiled with the following option enabled:
CONFIG_CACHEFILES_HISTOGRAM=y
then it will gather certain statistics and display them through a proc file.
(*) /proc/fs/cachefiles/histogram
cat /proc/fs/cachefiles/histogram
JIFS SECS LOOKUPS MKDIRS CREATES
===== ===== ========= ========= =========
This shows the breakdown of the number of times each amount of time
between 0 jiffies and HZ-1 jiffies a variety of tasks took to run. The
columns are as follows:
COLUMN TIME MEASUREMENT
======= =======================================================
LOOKUPS Length of time to perform a lookup on the backing fs
MKDIRS Length of time to perform a mkdir on the backing fs
CREATES Length of time to perform a create on the backing fs
Each row shows the number of events that took a particular range of times.
Each step is 1 jiffy in size. The JIFS column indicates the particular
jiffy range covered, and the SECS field the equivalent number of seconds.
=========
DEBUGGING
=========
If CONFIG_CACHEFILES_DEBUG is enabled, the CacheFiles facility can have runtime
debugging enabled by adjusting the value in:
/sys/module/cachefiles/parameters/debug
This is a bitmask of debugging streams to enable:
BIT VALUE STREAM POINT
======= ======= =============================== =======================
0 1 General Function entry trace
1 2 Function exit trace
2 4 General
The appropriate set of values should be OR'd together and the result written to
the control file. For example:
echo $((1|4|8)) >/sys/module/cachefiles/parameters/debug
will turn on all function entry debugging.
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Documentation/filesystems/ext2.txt
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......@@ -373,10 +373,11 @@ Filesystem Resizing http://ext2resize.sourceforge.net/
Compression (*) http://e2compr.sourceforge.net/
Implementations for:
Windows 95/98/NT/2000 http://uranus.it.swin.edu.au/~jn/linux/Explore2fs.htm
Windows 95 (*) http://www.yipton.demon.co.uk/content.html#FSDEXT2
Windows 95/98/NT/2000 http://www.chrysocome.net/explore2fs
Windows 95 (*) http://www.yipton.net/content.html#FSDEXT2
DOS client (*) ftp://metalab.unc.edu/pub/Linux/system/filesystems/ext2/
OS/2 http://perso.wanadoo.fr/matthieu.willm/ext2-os2/
RISC OS client ftp://ftp.barnet.ac.uk/pub/acorn/armlinux/iscafs/
OS/2 (+) ftp://metalab.unc.edu/pub/Linux/system/filesystems/ext2/
RISC OS client http://www.esw-heim.tu-clausthal.de/~marco/smorbrod/IscaFS/
(*) no longer actively developed/supported (as of Apr 2001)
(+) no longer actively developed/supported (as of Mar 2009)
Documentation/filesystems/ext3.txt
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......@@ -14,6 +14,11 @@ Options
When mounting an ext3 filesystem, the following option are accepted:
(*) == default
ro Mount filesystem read only. Note that ext3 will replay
the journal (and thus write to the partition) even when
mounted "read only". Mount options "ro,noload" can be
used to prevent writes to the filesystem.
journal=update Update the ext3 file system's journal to the current
format.
......@@ -27,7 +32,9 @@ journal_dev=devnum When the external journal device's major/minor numbers
identified through its new major/minor numbers encoded
in devnum.
noload Don't load the journal on mounting.
noload Don't load the journal on mounting. Note that this forces
mount of inconsistent filesystem, which can lead to
various problems.
data=journal All data are committed into the journal prior to being
written into the main file system.
......@@ -92,9 +99,12 @@ nocheck
debug Extra debugging information is sent to syslog.
errors=remount-ro(*) Remount the filesystem read-only on an error.
errors=remount-ro Remount the filesystem read-only on an error.
errors=continue Keep going on a filesystem error.
errors=panic Panic and halt the machine if an error occurs.
(These mount options override the errors behavior
specified in the superblock, which can be
configured using tune2fs.)
data_err=ignore(*) Just print an error message if an error occurs
in a file data buffer in ordered mode.
......@@ -198,5 +208,5 @@ kernel source: <file:fs/ext3/>
programs: http://e2fsprogs.sourceforge.net/
http://ext2resize.sourceforge.net
useful links: http://www-106.ibm.com/developerworks/linux/library/l-fs7/
http://www-106.ibm.com/developerworks/linux/library/l-fs8/
useful links: http://www.ibm.com/developerworks/library/l-fs7.html
http://www.ibm.com/developerworks/library/l-fs8.html
Documentation/filesystems/ext4.txt
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......@@ -85,7 +85,7 @@ Note: More extensive information for getting started with ext4 can be
* extent format more robust in face of on-disk corruption due to magics,
* internal redundancy in tree
* improved file allocation (multi-block alloc)
* fix 32000 subdirectory limit
* lift 32000 subdirectory limit imposed by i_links_count[1]
* nsec timestamps for mtime, atime, ctime, create time
* inode version field on disk (NFSv4, Lustre)
* reduced e2fsck time via uninit_bg feature
......@@ -100,6 +100,9 @@ Note: More extensive information for getting started with ext4 can be
* efficent new ordered mode in JBD2 and ext4(avoid using buffer head to force
the ordering)
[1] Filesystems with a block size of 1k may see a limit imposed by the
directory hash tree having a maximum depth of two.
2.2 Candidate features for future inclusion
* Online defrag (patches available but not well tested)
......@@ -180,8 +183,8 @@ commit=nrsec (*) Ext4 can be told to sync all its data and metadata
performance.
barrier=<0|1(*)> This enables/disables the use of write barriers in
the jbd code. barrier=0 disables, barrier=1 enables.
This also requires an IO stack which can support
barrier(*) the jbd code. barrier=0 disables, barrier=1 enables.
nobarrier This also requires an IO stack which can support
barriers, and if jbd gets an error on a barrier
write, it will disable again with a warning.
Write barriers enforce proper on-disk ordering
......@@ -189,6 +192,9 @@ barrier=<0|1(*)> This enables/disables the use of write barriers in
safe to use, at some performance penalty. If
your disks are battery-backed in one way or another,
disabling barriers may safely improve performance.
The mount options "barrier" and "nobarrier" can
also be used to enable or disable barriers, for
consistency with other ext4 mount options.
inode_readahead=n This tuning parameter controls the maximum
number of inode table blocks that ext4's inode
......@@ -310,6 +316,24 @@ journal_ioprio=prio The I/O priority (from 0 to 7, where 0 is the
a slightly higher priority than the default I/O
priority.
auto_da_alloc(*) Many broken applications don't use fsync() when
noauto_da_alloc replacing existing files via patterns such as
fd = open("foo.new")/write(fd,..)/close(fd)/
rename("foo.new", "foo"), or worse yet,
fd = open("foo", O_TRUNC)/write(fd,..)/close(fd).
If auto_da_alloc is enabled, ext4 will detect
the replace-via-rename and replace-via-truncate
patterns and force that any delayed allocation
blocks are allocated such that at the next
journal commit, in the default data=ordered
mode, the data blocks of the new file are forced
to disk before the rename() operation is
commited. This provides roughly the same level
of guarantees as ext3, and avoids the
"zero-length" problem that can happen when a
system crashes before the delayed allocation
blocks are forced to disk.
Data Mode
=========
There are 3 different data modes:
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......@@ -22,7 +22,7 @@ Squashfs filesystem features versus Cramfs:
Squashfs Cramfs
Max filesystem size: 2^64 16 MiB
Max filesystem size: 2^64 256 MiB
Max file size: ~ 2 TiB 16 MiB
Max files: unlimited unlimited
Max directories: unlimited unlimited
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......@@ -12,6 +12,7 @@ that support it. For example, a given bus might look like this:
| |-- enable
| |-- irq
| |-- local_cpus
| |-- remove
| |-- resource
| |-- resource0
| |-- resource1
......@@ -36,6 +37,7 @@ files, each with their own function.
enable Whether the device is enabled (ascii, rw)
irq IRQ number (ascii, ro)
local_cpus nearby CPU mask (cpumask, ro)
remove remove device from kernel's list (ascii, wo)
resource PCI resource host addresses (ascii, ro)
resource0..N PCI resource N, if present (binary, mmap)
resource0_wc..N_wc PCI WC map resource N, if prefetchable (binary, mmap)
......@@ -46,6 +48,7 @@ files, each with their own function.
ro - read only file
rw - file is readable and writable
wo - write only file
mmap - file is mmapable
ascii - file contains ascii text
binary - file contains binary data
......@@ -73,6 +76,13 @@ that the device must be enabled for a rom read to return data succesfully.
In the event a driver is not bound to the device, it can be enabled using the
'enable' file, documented above.
The 'remove' file is used to remove the PCI device, by writing a non-zero
integer to the file. This does not involve any kind of hot-plug functionality,
e.g. powering off the device. The device is removed from the kernel's list of
PCI devices, the sysfs directory for it is removed, and the device will be
removed from any drivers attached to it. Removal of PCI root buses is
disallowed.
Accessing legacy resources through sysfs
----------------------------------------
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gid= Set the default group.
umask= Set the default umask.
mode= Set the default file permissions.
dmode= Set the default directory permissions.
uid= Set the default user.
bs= Set the block size.
unhide Show otherwise hidden files.
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arch/arm/mach-mx2/generic.c
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arch/arm/mach-mx3/iomux.c
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arch/arm/mach-ns9xxx/irq.c
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arch/arm/mach-omap1/board-generic.c
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arch/arm/mach-omap1/board-h2-mmc.c
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arch/arm/mach-omap1/board-h3-mmc.c
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arch/arm/mach-omap1/mux.c
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arch/arm/plat-mxc/iomux-mx1-mx2.c
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arch/arm/plat-omap/clock.c
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arch/arm/plat-omap/common.c
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arch/arm/plat-omap/cpu-omap.c
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arch/arm/plat-omap/devices.c
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arch/arm/plat-omap/dma.c
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arch/arm/plat-omap/dmtimer.c
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arch/arm/plat-omap/gpio.c
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arch/arm/plat-omap/i2c.c
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arch/arm/plat-omap/usb.c
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arch/arm/plat-orion/gpio.c
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arch/arm/plat-orion/include/plat/orion5x_wdt.h 0 → 100644
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arch/arm/plat-pxa/include/plat/dma.h 0 → 100644
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arch/arm/plat-s3c/include/plat/usb-control.h 0 → 100644
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arch/arm/plat-s3c/pm-check.c 0 → 100644
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arch/arm/plat-s3c24xx/common-smdk.c
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arch/arm/plat-s3c24xx/cpu.c
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arch/arm/plat-s3c24xx/irq-pm.c 0 → 100644
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arch/arm/plat-s3c24xx/irq.c
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arch/arm/plat-s3c24xx/pm-simtec.c
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arch/arm/plat-s3c24xx/pm.c
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arch/arm/plat-s3c24xx/s3c244x.c
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arch/arm/plat-s3c24xx/sleep.S
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arch/arm/plat-s3c64xx/clock.c
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arch/arm/plat-s3c64xx/cpu.c
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arch/arm/plat-s3c64xx/gpiolib.c
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arch/arm/plat-s3c64xx/include/plat/regs-modem.h 0 → 100644
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arch/arm/plat-s3c64xx/include/plat/regs-syscon-power.h 0 → 100644
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arch/arm/plat-s3c64xx/irq-eint.c
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arch/arm/plat-s3c64xx/irq.c
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arch/arm/tools/mach-types
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arch/arm/vfp/entry.S
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arch/arm/vfp/vfp.h
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arch/arm/vfp/vfphw.S
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arch/arm/vfp/vfpmodule.c
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arch/avr32/Kconfig
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arch/avr32/Makefile
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arch/avr32/boards/atngw100/setup.c
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arch/avr32/boards/favr-32/setup.c
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arch/avr32/boards/merisc/flash.c 0 → 100644
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arch/avr32/boards/merisc/merisc.h 0 → 100644
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arch/avr32/boards/merisc/merisc_sysfs.c 0 → 100644
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arch/avr32/boards/mimc200/setup.c
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arch/avr32/include/asm/ftrace.h 0 → 100644
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arch/avr32/include/asm/hardirq.h
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arch/avr32/include/asm/socket.h
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arch/avr32/include/asm/uaccess.h
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arch/avr32/kernel/entry-avr32b.S
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arch/avr32/kernel/irq.c
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arch/avr32/kernel/process.c
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arch/avr32/kernel/syscall-stubs.S
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arch/avr32/lib/strnlen_user.S
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arch/avr32/mach-at32ap/at32ap700x.c
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arch/avr32/mm/fault.c
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arch/blackfin/Kconfig
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arch/blackfin/Kconfig.debug
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arch/blackfin/include/asm/Kbuild
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arch/blackfin/include/asm/gpio.h
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arch/blackfin/include/asm/ipipe.h
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arch/blackfin/include/asm/irq.h
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arch/blackfin/include/asm/percpu.h
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arch/blackfin/include/asm/socket.h
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arch/blackfin/kernel/Makefile
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arch/blackfin/kernel/bfin_gpio.c
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arch/blackfin/kernel/ipipe.c
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arch/blackfin/kernel/irqchip.c
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arch/blackfin/kernel/kgdb_test.c
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arch/blackfin/kernel/process.c
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arch/blackfin/kernel/ptrace.c
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arch/blackfin/kernel/setup.c
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arch/blackfin/kernel/time.c
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arch/blackfin/kernel/vmlinux.lds.S
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