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

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
......@@ -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,
......
......@@ -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
......
......@@ -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,
......
......@@ -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;
......
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