Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit c637e486 authored by Zhang Rui's avatar Zhang Rui Committed by Len Brown
Browse files

ACPI: introduce module parameter acpi.aml_debug_output 



Introduce module parameter acpi.aml_debug_output.

With acpi.aml_debug_output set, we can get AML debug object output
(Store (AAA, Debug)), even with CONFIG_ACPI_DEBUG cleared.

Together with the runtime custom method mechanism,
we can debug AML code problems without rebuilding the kernel.

Signed-off-by: default avatarZhang Rui <rui.zhang@intel.com>
Signed-off-by: default avatarLen Brown <len.brown@intel.com>
parent a25ee920

Documentation/acpi/method-customizing.txt

+2 −0
Original line number Diff line number Diff line
@@ -19,6 +19,8 @@ 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.

Note: To get the ACPI debug object output (Store (AAAA, Debug)),

      please run "echo 1 > /sys/module/acpi/parameters/aml_debug_output".



1. override an existing method

   a) get the ACPI table via ACPI sysfs I/F. e.g. to get the DSDT,

drivers/acpi/acpica/acglobal.h

+1 −1
Original line number Diff line number Diff line
@@ -115,7 +115,7 @@ u8 ACPI_INIT_GLOBAL(acpi_gbl_use_default_register_widths, TRUE); 
/*

 * Optionally enable output from the AML Debug Object.

 */

u8 ACPI_INIT_GLOBAL(acpi_gbl_enable_aml_debug_object, FALSE);

u32 ACPI_INIT_GLOBAL(acpi_gbl_enable_aml_debug_object, FALSE);



/*

 * Optionally copy the entire DSDT to local memory (instead of simply

drivers/acpi/debugfs.c

+8 −0
Original line number Diff line number Diff line
@@ -12,6 +12,14 @@ 
#define _COMPONENT		ACPI_SYSTEM_COMPONENT

ACPI_MODULE_NAME("debugfs");





/* /sys/modules/acpi/parameters/aml_debug_output */



module_param_named(aml_debug_output, acpi_gbl_enable_aml_debug_object,

		   bool, 0644);

MODULE_PARM_DESC(aml_debug_output,

		 "To enable/disable the ACPI Debug Object output.");



/* /sys/kernel/debug/acpi/custom_method */



static ssize_t cm_write(struct file *file, const char __user * user_buf,

include/acpi/acpixf.h

+1 −1
Original line number Diff line number Diff line
@@ -67,7 +67,7 @@ extern u8 acpi_gbl_leave_wake_gpes_disabled; 
extern u8 acpi_gbl_use_default_register_widths;

extern acpi_name acpi_gbl_trace_method_name;

extern u32 acpi_gbl_trace_flags;

extern u8 acpi_gbl_enable_aml_debug_object;

extern u32 acpi_gbl_enable_aml_debug_object;

extern u8 acpi_gbl_copy_dsdt_locally;

extern u8 acpi_gbl_truncate_io_addresses;