ACPI / debugger: Add IO interface to access debugger functionalities

This patch adds /sys/kernel/debug/acpi/acpidbg, which can be used by
userspace programs to access ACPICA debugger functionalities.

Known issue:
1. IO flush support
   acpi_os_notify_command_complete() and acpi_os_wait_command_ready() can
   be used by acpi_dbg module to implement .flush() filesystem operation.
   While this patch doesn't go that far. It then becomes userspace tool's
   duty now to flush old commands before executing new batch mode commands.

Signed-off-by: Lv Zheng <lv.zheng@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
index 5eef4cb4f70e..2a7e6d4c3edc 100644
--- a/drivers/acpi/Kconfig
+++ b/drivers/acpi/Kconfig
@@ -58,8 +58,9 @@ config ACPI_CCA_REQUIRED
         bool
 
 config ACPI_DEBUGGER
-        bool "AML debugger interface (EXPERIMENTAL)"
+        bool "AML debugger interface"
         select ACPI_DEBUG
+        depends on DEBUG_FS
         help
           Enable in-kernel debugging of AML facilities: statistics, internal
           object dump, single step control method execution.