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Merge branch 'acpi-trace'
* acpi-trace: ACPI / Documentation: Update method tracing documentation. ACPI / sysfs: Add support to allow leading "\" missing in trace_method_name. ACPI / sysfs: Update method tracing facility. ACPI / sysfs: Add ACPI_LV_REPAIR debug level.
This commit is contained in:
Rafael J. Wysocki
commit
94f2bb9b59
@ -1,26 +1,192 @@
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/sys/module/acpi/parameters/:
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ACPICA Trace Facility
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trace_method_name
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The AML method name that the user wants to trace
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Copyright (C) 2015, Intel Corporation
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Author: Lv Zheng <lv.zheng@intel.com>
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trace_debug_layer
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The temporary debug_layer used when tracing the method.
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Using 0xffffffff by default if it is 0.
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trace_debug_level
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The temporary debug_level used when tracing the method.
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Using 0x00ffffff by default if it is 0.
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Abstract:
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trace_state
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This document describes the functions and the interfaces of the method
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tracing facility.
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1. Functionalities and usage examples:
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ACPICA provides method tracing capability. And two functions are
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currently implemented using this capability.
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A. Log reducer
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ACPICA subsystem provides debugging outputs when CONFIG_ACPI_DEBUG is
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enabled. The debugging messages which are deployed via
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ACPI_DEBUG_PRINT() macro can be reduced at 2 levels - per-component
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level (known as debug layer, configured via
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/sys/module/acpi/parameters/debug_layer) and per-type level (known as
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debug level, configured via /sys/module/acpi/parameters/debug_level).
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But when the particular layer/level is applied to the control method
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evaluations, the quantity of the debugging outputs may still be too
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large to be put into the kernel log buffer. The idea thus is worked out
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to only enable the particular debug layer/level (normally more detailed)
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logs when the control method evaluation is started, and disable the
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detailed logging when the control method evaluation is stopped.
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The following command examples illustrate the usage of the "log reducer"
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functionality:
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a. Filter out the debug layer/level matched logs when control methods
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are being evaluated:
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# cd /sys/module/acpi/parameters
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# echo "0xXXXXXXXX" > trace_debug_layer
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# echo "0xYYYYYYYY" > trace_debug_level
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# echo "enable" > trace_state
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b. Filter out the debug layer/level matched logs when the specified
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control method is being evaluated:
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# cd /sys/module/acpi/parameters
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# echo "0xXXXXXXXX" > trace_debug_layer
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# echo "0xYYYYYYYY" > trace_debug_level
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# echo "\PPPP.AAAA.TTTT.HHHH" > trace_method_name
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# echo "method" > /sys/module/acpi/parameters/trace_state
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c. Filter out the debug layer/level matched logs when the specified
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control method is being evaluated for the first time:
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# cd /sys/module/acpi/parameters
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# echo "0xXXXXXXXX" > trace_debug_layer
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# echo "0xYYYYYYYY" > trace_debug_level
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# echo "\PPPP.AAAA.TTTT.HHHH" > trace_method_name
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# echo "method-once" > /sys/module/acpi/parameters/trace_state
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Where:
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0xXXXXXXXX/0xYYYYYYYY: Refer to Documentation/acpi/debug.txt for
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possible debug layer/level masking values.
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\PPPP.AAAA.TTTT.HHHH: Full path of a control method that can be found
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in the ACPI namespace. It needn't be an entry
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of a control method evaluation.
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B. AML tracer
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There are special log entries added by the method tracing facility at
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the "trace points" the AML interpreter starts/stops to execute a control
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method, or an AML opcode. Note that the format of the log entries are
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subject to change:
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[ 0.186427] exdebug-0398 ex_trace_point : Method Begin [0xf58394d8:\_SB.PCI0.LPCB.ECOK] execution.
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[ 0.186630] exdebug-0398 ex_trace_point : Opcode Begin [0xf5905c88:If] execution.
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[ 0.186820] exdebug-0398 ex_trace_point : Opcode Begin [0xf5905cc0:LEqual] execution.
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[ 0.187010] exdebug-0398 ex_trace_point : Opcode Begin [0xf5905a20:-NamePath-] execution.
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[ 0.187214] exdebug-0398 ex_trace_point : Opcode End [0xf5905a20:-NamePath-] execution.
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[ 0.187407] exdebug-0398 ex_trace_point : Opcode Begin [0xf5905f60:One] execution.
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[ 0.187594] exdebug-0398 ex_trace_point : Opcode End [0xf5905f60:One] execution.
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[ 0.187789] exdebug-0398 ex_trace_point : Opcode End [0xf5905cc0:LEqual] execution.
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[ 0.187980] exdebug-0398 ex_trace_point : Opcode Begin [0xf5905cc0:Return] execution.
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[ 0.188146] exdebug-0398 ex_trace_point : Opcode Begin [0xf5905f60:One] execution.
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[ 0.188334] exdebug-0398 ex_trace_point : Opcode End [0xf5905f60:One] execution.
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[ 0.188524] exdebug-0398 ex_trace_point : Opcode End [0xf5905cc0:Return] execution.
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[ 0.188712] exdebug-0398 ex_trace_point : Opcode End [0xf5905c88:If] execution.
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[ 0.188903] exdebug-0398 ex_trace_point : Method End [0xf58394d8:\_SB.PCI0.LPCB.ECOK] execution.
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Developers can utilize these special log entries to track the AML
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interpretion, thus can aid issue debugging and performance tuning. Note
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that, as the "AML tracer" logs are implemented via ACPI_DEBUG_PRINT()
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macro, CONFIG_ACPI_DEBUG is also required to be enabled for enabling
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"AML tracer" logs.
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The following command examples illustrate the usage of the "AML tracer"
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functionality:
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a. Filter out the method start/stop "AML tracer" logs when control
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methods are being evaluated:
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# cd /sys/module/acpi/parameters
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# echo "0x80" > trace_debug_layer
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# echo "0x10" > trace_debug_level
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# echo "enable" > trace_state
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b. Filter out the method start/stop "AML tracer" when the specified
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control method is being evaluated:
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# cd /sys/module/acpi/parameters
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# echo "0x80" > trace_debug_layer
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# echo "0x10" > trace_debug_level
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# echo "\PPPP.AAAA.TTTT.HHHH" > trace_method_name
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# echo "method" > trace_state
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c. Filter out the method start/stop "AML tracer" logs when the specified
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control method is being evaluated for the first time:
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# cd /sys/module/acpi/parameters
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# echo "0x80" > trace_debug_layer
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# echo "0x10" > trace_debug_level
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# echo "\PPPP.AAAA.TTTT.HHHH" > trace_method_name
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# echo "method-once" > trace_state
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d. Filter out the method/opcode start/stop "AML tracer" when the
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specified control method is being evaluated:
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# cd /sys/module/acpi/parameters
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# echo "0x80" > trace_debug_layer
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# echo "0x10" > trace_debug_level
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# echo "\PPPP.AAAA.TTTT.HHHH" > trace_method_name
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# echo "opcode" > trace_state
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e. Filter out the method/opcode start/stop "AML tracer" when the
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specified control method is being evaluated for the first time:
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# cd /sys/module/acpi/parameters
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# echo "0x80" > trace_debug_layer
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# echo "0x10" > trace_debug_level
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# echo "\PPPP.AAAA.TTTT.HHHH" > trace_method_name
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# echo "opcode-opcode" > trace_state
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Note that all above method tracing facility related module parameters can
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be used as the boot parameters, for example:
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acpi.trace_debug_layer=0x80 acpi.trace_debug_level=0x10 \
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acpi.trace_method_name=\_SB.LID0._LID acpi.trace_state=opcode-once
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2. Interface descriptions:
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All method tracing functions can be configured via ACPI module
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parameters that are accessible at /sys/module/acpi/parameters/:
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trace_method_name
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The full path of the AML method that the user wants to trace.
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Note that the full path shouldn't contain the trailing "_"s in its
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name segments but may contain "\" to form an absolute path.
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trace_debug_layer
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The temporary debug_layer used when the tracing feature is enabled.
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Using ACPI_EXECUTER (0x80) by default, which is the debug_layer
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used to match all "AML tracer" logs.
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trace_debug_level
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The temporary debug_level used when the tracing feature is enabled.
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Using ACPI_LV_TRACE_POINT (0x10) by default, which is the
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debug_level used to match all "AML tracer" logs.
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trace_state
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The status of the tracing feature.
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"enabled" means this feature is enabled
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and the AML method is traced every time it's executed.
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"1" means this feature is enabled and the AML method
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will only be traced during the next execution.
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"disabled" means this feature is disabled.
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Users can enable/disable this debug tracing feature by
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"echo string > /sys/module/acpi/parameters/trace_state".
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"string" should be one of "enable", "disable" and "1".
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Users can enable/disable this debug tracing feature by executing
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the following command:
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# echo string > /sys/module/acpi/parameters/trace_state
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Where "string" should be one of the followings:
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"disable"
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Disable the method tracing feature.
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"enable"
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Enable the method tracing feature.
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ACPICA debugging messages matching
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"trace_debug_layer/trace_debug_level" during any method
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execution will be logged.
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"method"
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Enable the method tracing feature.
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ACPICA debugging messages matching
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"trace_debug_layer/trace_debug_level" during method execution
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of "trace_method_name" will be logged.
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"method-once"
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Enable the method tracing feature.
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ACPICA debugging messages matching
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"trace_debug_layer/trace_debug_level" during method execution
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of "trace_method_name" will be logged only once.
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"opcode"
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Enable the method tracing feature.
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ACPICA debugging messages matching
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"trace_debug_layer/trace_debug_level" during method/opcode
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execution of "trace_method_name" will be logged.
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"opcode-once"
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Enable the method tracing feature.
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ACPICA debugging messages matching
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"trace_debug_layer/trace_debug_level" during method/opcode
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execution of "trace_method_name" will be logged only once.
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Note that, the difference between the "enable" and other feature
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enabling options are:
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1. When "enable" is specified, since
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"trace_debug_layer/trace_debug_level" shall apply to all control
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method evaluations, after configuring "trace_state" to "enable",
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"trace_method_name" will be reset to NULL.
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2. When "method/opcode" is specified, if
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"trace_method_name" is NULL when "trace_state" is configured to
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these options, the "trace_debug_layer/trace_debug_level" will
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apply to all control method evaluations.
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@ -83,6 +83,7 @@ static void *acpi_irq_context;
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static struct workqueue_struct *kacpid_wq;
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static struct workqueue_struct *kacpi_notify_wq;
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static struct workqueue_struct *kacpi_hotplug_wq;
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static bool acpi_os_initialized;
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/*
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* This list of permanent mappings is for memory that may be accessed from
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@ -1316,6 +1317,9 @@ acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
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long jiffies;
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int ret = 0;
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if (!acpi_os_initialized)
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return AE_OK;
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if (!sem || (units < 1))
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return AE_BAD_PARAMETER;
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@ -1355,6 +1359,9 @@ acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
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{
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struct semaphore *sem = (struct semaphore *)handle;
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if (!acpi_os_initialized)
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return AE_OK;
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if (!sem || (units < 1))
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return AE_BAD_PARAMETER;
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@ -1863,6 +1870,7 @@ acpi_status __init acpi_os_initialize(void)
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rv = acpi_os_map_generic_address(&acpi_gbl_FADT.reset_register);
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pr_debug(PREFIX "%s: map reset_reg status %d\n", __func__, rv);
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}
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acpi_os_initialized = true;
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return AE_OK;
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}
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@ -69,6 +69,8 @@ static const struct acpi_dlevel acpi_debug_levels[] = {
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ACPI_DEBUG_INIT(ACPI_LV_INIT),
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ACPI_DEBUG_INIT(ACPI_LV_DEBUG_OBJECT),
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ACPI_DEBUG_INIT(ACPI_LV_INFO),
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ACPI_DEBUG_INIT(ACPI_LV_REPAIR),
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ACPI_DEBUG_INIT(ACPI_LV_TRACE_POINT),
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ACPI_DEBUG_INIT(ACPI_LV_INIT_NAMES),
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ACPI_DEBUG_INIT(ACPI_LV_PARSE),
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@ -162,55 +164,116 @@ static const struct kernel_param_ops param_ops_debug_level = {
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module_param_cb(debug_layer, ¶m_ops_debug_layer, &acpi_dbg_layer, 0644);
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module_param_cb(debug_level, ¶m_ops_debug_level, &acpi_dbg_level, 0644);
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static char trace_method_name[6];
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module_param_string(trace_method_name, trace_method_name, 6, 0644);
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static unsigned int trace_debug_layer;
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module_param(trace_debug_layer, uint, 0644);
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static unsigned int trace_debug_level;
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module_param(trace_debug_level, uint, 0644);
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static char trace_method_name[1024];
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int param_set_trace_method_name(const char *val, const struct kernel_param *kp)
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{
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u32 saved_flags = 0;
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bool is_abs_path = true;
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if (*val != '\\')
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is_abs_path = false;
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if ((is_abs_path && strlen(val) > 1023) ||
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(!is_abs_path && strlen(val) > 1022)) {
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pr_err("%s: string parameter too long\n", kp->name);
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return -ENOSPC;
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}
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/*
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* It's not safe to update acpi_gbl_trace_method_name without
|
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* having the tracer stopped, so we save the original tracer
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* state and disable it.
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*/
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saved_flags = acpi_gbl_trace_flags;
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(void)acpi_debug_trace(NULL,
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acpi_gbl_trace_dbg_level,
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acpi_gbl_trace_dbg_layer,
|
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0);
|
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|
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/* This is a hack. We can't kmalloc in early boot. */
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if (is_abs_path)
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strcpy(trace_method_name, val);
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else {
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trace_method_name[0] = '\\';
|
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strcpy(trace_method_name+1, val);
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}
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|
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/* Restore the original tracer state */
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(void)acpi_debug_trace(trace_method_name,
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acpi_gbl_trace_dbg_level,
|
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acpi_gbl_trace_dbg_layer,
|
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saved_flags);
|
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|
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return 0;
|
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}
|
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|
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static int param_get_trace_method_name(char *buffer, const struct kernel_param *kp)
|
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{
|
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return scnprintf(buffer, PAGE_SIZE, "%s", acpi_gbl_trace_method_name);
|
||||
}
|
||||
|
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static const struct kernel_param_ops param_ops_trace_method = {
|
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.set = param_set_trace_method_name,
|
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.get = param_get_trace_method_name,
|
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};
|
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|
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static const struct kernel_param_ops param_ops_trace_attrib = {
|
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.set = param_set_uint,
|
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.get = param_get_uint,
|
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};
|
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|
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module_param_cb(trace_method_name, ¶m_ops_trace_method, &trace_method_name, 0644);
|
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module_param_cb(trace_debug_layer, ¶m_ops_trace_attrib, &acpi_gbl_trace_dbg_layer, 0644);
|
||||
module_param_cb(trace_debug_level, ¶m_ops_trace_attrib, &acpi_gbl_trace_dbg_level, 0644);
|
||||
|
||||
static int param_set_trace_state(const char *val, struct kernel_param *kp)
|
||||
{
|
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int result = 0;
|
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acpi_status status;
|
||||
const char *method = trace_method_name;
|
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u32 flags = 0;
|
||||
|
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if (!strncmp(val, "enable", sizeof("enable") - 1)) {
|
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result = acpi_debug_trace(trace_method_name, trace_debug_level,
|
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trace_debug_layer, 0);
|
||||
if (result)
|
||||
result = -EBUSY;
|
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goto exit;
|
||||
}
|
||||
/* So "xxx-once" comparison should go prior than "xxx" comparison */
|
||||
#define acpi_compare_param(val, key) \
|
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strncmp((val), (key), sizeof(key) - 1)
|
||||
|
||||
if (!strncmp(val, "disable", sizeof("disable") - 1)) {
|
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int name = 0;
|
||||
result = acpi_debug_trace((char *)&name, trace_debug_level,
|
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trace_debug_layer, 0);
|
||||
if (result)
|
||||
result = -EBUSY;
|
||||
goto exit;
|
||||
}
|
||||
if (!acpi_compare_param(val, "enable")) {
|
||||
method = NULL;
|
||||
flags = ACPI_TRACE_ENABLED;
|
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} else if (!acpi_compare_param(val, "disable"))
|
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method = NULL;
|
||||
else if (!acpi_compare_param(val, "method-once"))
|
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flags = ACPI_TRACE_ENABLED | ACPI_TRACE_ONESHOT;
|
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else if (!acpi_compare_param(val, "method"))
|
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flags = ACPI_TRACE_ENABLED;
|
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else if (!acpi_compare_param(val, "opcode-once"))
|
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flags = ACPI_TRACE_ENABLED | ACPI_TRACE_ONESHOT | ACPI_TRACE_OPCODE;
|
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else if (!acpi_compare_param(val, "opcode"))
|
||||
flags = ACPI_TRACE_ENABLED | ACPI_TRACE_OPCODE;
|
||||
else
|
||||
return -EINVAL;
|
||||
|
||||
if (!strncmp(val, "1", 1)) {
|
||||
result = acpi_debug_trace(trace_method_name, trace_debug_level,
|
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trace_debug_layer, 1);
|
||||
if (result)
|
||||
result = -EBUSY;
|
||||
goto exit;
|
||||
}
|
||||
status = acpi_debug_trace(method,
|
||||
acpi_gbl_trace_dbg_level,
|
||||
acpi_gbl_trace_dbg_layer,
|
||||
flags);
|
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if (ACPI_FAILURE(status))
|
||||
return -EBUSY;
|
||||
|
||||
result = -EINVAL;
|
||||
exit:
|
||||
return result;
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int param_get_trace_state(char *buffer, struct kernel_param *kp)
|
||||
{
|
||||
if (!acpi_gbl_trace_method_name)
|
||||
if (!(acpi_gbl_trace_flags & ACPI_TRACE_ENABLED))
|
||||
return sprintf(buffer, "disable");
|
||||
else {
|
||||
if (acpi_gbl_trace_flags & 1)
|
||||
return sprintf(buffer, "1");
|
||||
else
|
||||
if (acpi_gbl_trace_method_name) {
|
||||
if (acpi_gbl_trace_flags & ACPI_TRACE_ONESHOT)
|
||||
return sprintf(buffer, "method-once");
|
||||
else
|
||||
return sprintf(buffer, "method");
|
||||
} else
|
||||
return sprintf(buffer, "enable");
|
||||
}
|
||||
return 0;
|
||||
|
||||
Loading…
Reference in New Issue
Block a user