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Linus Torvalds
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--- | ||
refs/heads/master: f5e2bae0aad03164ffc7ce9dfeee6608e2c87dba | ||
refs/heads/master: b8be634e01b400fa2528848ad0cd6a5580a15bc4 |
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What: /sys/devices/system/memory/soft_offline_page | ||
Date: Sep 2009 | ||
KernelVersion: 2.6.33 | ||
Contact: andi@firstfloor.org | ||
Description: | ||
Soft-offline the memory page containing the physical address | ||
written into this file. Input is a hex number specifying the | ||
physical address of the page. The kernel will then attempt | ||
to soft-offline it, by moving the contents elsewhere or | ||
dropping it if possible. The kernel will then be placed | ||
on the bad page list and never be reused. | ||
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The offlining is done in kernel specific granuality. | ||
Normally it's the base page size of the kernel, but | ||
this might change. | ||
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The page must be still accessible, not poisoned. The | ||
kernel will never kill anything for this, but rather | ||
fail the offline. Return value is the size of the | ||
number, or a error when the offlining failed. Reading | ||
the file is not allowed. | ||
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What: /sys/devices/system/memory/hard_offline_page | ||
Date: Sep 2009 | ||
KernelVersion: 2.6.33 | ||
Contact: andi@firstfloor.org | ||
Description: | ||
Hard-offline the memory page containing the physical | ||
address written into this file. Input is a hex number | ||
specifying the physical address of the page. The | ||
kernel will then attempt to hard-offline the page, by | ||
trying to drop the page or killing any owner or | ||
triggering IO errors if needed. Note this may kill | ||
any processes owning the page. The kernel will avoid | ||
to access this page assuming it's poisoned by the | ||
hardware. | ||
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The offlining is done in kernel specific granuality. | ||
Normally it's the base page size of the kernel, but | ||
this might change. | ||
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Return value is the size of the number, or a error when | ||
the offlining failed. | ||
Reading the file is not allowed. |
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Linux ACPI Custom Control Method How To | ||
======================================= | ||
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Written by Zhang Rui <rui.zhang@intel.com> | ||
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Linux supports customizing ACPI control methods at runtime. | ||
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Users can use this to | ||
1. override an existing method which may not work correctly, | ||
or just for debugging purposes. | ||
2. insert a completely new method in order to create a missing | ||
method such as _OFF, _ON, _STA, _INI, etc. | ||
For these cases, it is far simpler to dynamically install a single | ||
control method rather than override the entire DSDT, because kernel | ||
rebuild/reboot is not needed and test result can be got in minutes. | ||
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Note: Only ACPI METHOD can be overridden, any other object types like | ||
"Device", "OperationRegion", are not recognized. | ||
Note: The same ACPI control method can be overridden for many times, | ||
and it's always the latest one that used by Linux/kernel. | ||
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1. override an existing method | ||
a) get the ACPI table via ACPI sysfs I/F. e.g. to get the DSDT, | ||
just run "cat /sys/firmware/acpi/tables/DSDT > /tmp/dsdt.dat" | ||
b) disassemble the table by running "iasl -d dsdt.dat". | ||
c) rewrite the ASL code of the method and save it in a new file, | ||
d) package the new file (psr.asl) to an ACPI table format. | ||
Here is an example of a customized \_SB._AC._PSR method, | ||
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DefinitionBlock ("", "SSDT", 1, "", "", 0x20080715) | ||
{ | ||
External (ACON) | ||
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Method (\_SB_.AC._PSR, 0, NotSerialized) | ||
{ | ||
Store ("In AC _PSR", Debug) | ||
Return (ACON) | ||
} | ||
} | ||
Note that the full pathname of the method in ACPI namespace | ||
should be used. | ||
And remember to use "External" to declare external objects. | ||
e) assemble the file to generate the AML code of the method. | ||
e.g. "iasl psr.asl" (psr.aml is generated as a result) | ||
f) mount debugfs by "mount -t debugfs none /sys/kernel/debug" | ||
g) override the old method via the debugfs by running | ||
"cat /tmp/psr.aml > /sys/kernel/debug/acpi/custom_method" | ||
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2. insert a new method | ||
This is easier than overriding an existing method. | ||
We just need to create the ASL code of the method we want to | ||
insert and then follow the step c) ~ g) in section 1. | ||
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3. undo your changes | ||
The "undo" operation is not supported for a new inserted method | ||
right now, i.e. we can not remove a method currently. | ||
For an overrided method, in order to undo your changes, please | ||
save a copy of the method original ASL code in step c) section 1, | ||
and redo step c) ~ g) to override the method with the original one. | ||
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Note: We can use a kernel with multiple custom ACPI method running, | ||
But each individual write to debugfs can implement a SINGLE | ||
method override. i.e. if we want to insert/override multiple | ||
ACPI methods, we need to redo step c) ~ g) for multiple times. |
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obj-m := gptimers-example.o | ||
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all: modules | ||
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modules clean: | ||
$(MAKE) -C ../.. SUBDIRS=$(PWD) $@ |
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