ACPI: Enable build of AML interpreter debugger

This patch enables ACPICA debugger files using a configurable
CONFIG_ACPI_DEBUGGER configuration item. Those debugger related code that
was originally masked as ACPI_FUTURE_USAGE now gets unmasked.

Necessary OSL stubs are also added in this patch:
1. acpi_os_readable(): This should be arch specific in Linux, while this
    patch doesn't introduce real implementation and a complex mechanism to
    allow architecture specific acpi_os_readable() to be implemented to
    validate the address. It may be done by future commits.
2. acpi_os_get_line(): This is used to obtain debugger command input. This
    patch only introduces a simple KDB concept example in it and the
    example should be co-working with the code implemented in
    acpi_os_printf(). Since this KDB example won't be compiled unless
    ENABLE_DEBUGGER is defined and it seems Linux has already stopped to
    use ENABLE_DEBUGGER, thus do not expect it can work properly.

This patch also cleans up all other ACPI_FUTURE_USAGE surroundings
accordingly.
1. Since linkage error can be automatically detected, declaration in the
   headers needn't be surrounded by ACPI_FUTURE_USAGE.
   So only the following separate exported fuction bodies are masked by
   this macro (other exported fucntions may have already been masked at
   entire module level via drivers/acpi/acpica/Makefile):
     acpi_install_exception_handler()
     acpi_subsystem_status()
     acpi_get_system_info()
     acpi_get_statistics()
     acpi_install_initialization_handler()
2. Since strip can automatically zap the no-user functions, functions that
   are not marked with ACPI_EXPORT_SYMBOL() needn't get surrounded by
   ACPI_FUTURE_USAGE.
   So the following function which is not used by Linux kernel now won't
   get surrounded by this macro:
     acpi_ps_get_name()

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

17 files changed, 43 insertions, 49 deletions

diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
index 5d1015c26ff4..706c2e95503f 100644
--- a/drivers/acpi/Kconfig
+++ b/drivers/acpi/Kconfig
@@ -57,6 +57,15 @@ config ACPI_SYSTEM_POWER_STATES_SUPPORT
 config ACPI_CCA_REQUIRED
         bool
 
+config ACPI_DEBUGGER
+        bool "In-kernel debugger (EXPERIMENTAL)"
+        select ACPI_DEBUG
+        help
+          Enable in-kernel debugging facilities: statistics, internal
+          object dump, single step control method execution.
+          This is still under development, currently enabling this only
+          results in the compilation of the ACPICA debugger files.
+
 config ACPI_SLEEP
         bool
         depends on SUSPEND || HIBERNATION
diff --git a/drivers/acpi/acpica/Makefile b/drivers/acpi/acpica/Makefile
index ac78d7657204..885936f79542 100644
--- a/drivers/acpi/acpica/Makefile
+++ b/drivers/acpi/acpica/Makefile
@@ -177,8 +177,24 @@ acpi-y +=		\
         utxferror.o     \
         utxfmutex.o
 
-acpi-$(ACPI_FUTURE_USAGE) +=    \
+acpi-$(CONFIG_ACPI_DEBUGGER) += \
+        dbcmds.o                \
+        dbconvert.o             \
+        dbdisply.o              \
+        dbexec.o                \
+        dbhistry.o              \
+        dbinput.o               \
+        dbmethod.o              \
+        dbnames.o               \
+        dbobject.o              \
+        dbstats.o               \
+        dbutils.o               \
+        dbxface.o               \
         rsdump.o                \
+
+acpi-$(ACPI_FUTURE_USAGE) +=    \
+        dbfileio.o              \
+        dbtest.o                \
         utcache.o               \
         utfileio.o              \
         utprint.o               \
diff --git a/drivers/acpi/acpica/acinterp.h b/drivers/acpi/acpica/acinterp.h
index e820ed8f173f..e9e936e78154 100644
--- a/drivers/acpi/acpica/acinterp.h
+++ b/drivers/acpi/acpica/acinterp.h
@@ -397,12 +397,10 @@ void
 acpi_ex_dump_operands(union acpi_operand_object **operands,
                       const char *opcode_name, u32 num_opcodes);
 
-#ifdef  ACPI_FUTURE_USAGE
 void
 acpi_ex_dump_object_descriptor(union acpi_operand_object *object, u32 flags);
 
 void acpi_ex_dump_namespace_node(struct acpi_namespace_node *node, u32 flags);
-#endif                          /* ACPI_FUTURE_USAGE */
 
 /*
  * exnames - AML namestring support
diff --git a/drivers/acpi/acpica/acnamesp.h b/drivers/acpi/acpica/acnamesp.h
index ea0d9076d408..5d261c942a0d 100644
--- a/drivers/acpi/acpica/acnamesp.h
+++ b/drivers/acpi/acpica/acnamesp.h
@@ -193,9 +193,7 @@ acpi_ns_convert_to_resource(union acpi_operand_object *original_object,
 /*
  * nsdump - Namespace dump/print utilities
  */
-#ifdef  ACPI_FUTURE_USAGE
 void acpi_ns_dump_tables(acpi_handle search_base, u32 max_depth);
-#endif                          /* ACPI_FUTURE_USAGE */
 
 void acpi_ns_dump_entry(acpi_handle handle, u32 debug_level);
 
@@ -208,7 +206,6 @@ acpi_status
 acpi_ns_dump_one_object(acpi_handle obj_handle,
                         u32 level, void *context, void **return_value);
 
-#ifdef  ACPI_FUTURE_USAGE
 void
 acpi_ns_dump_objects(acpi_object_type type,
                      u8 display_type,
@@ -220,7 +217,6 @@ acpi_ns_dump_object_paths(acpi_object_type type,
                           u8 display_type,
                           u32 max_depth,
                           acpi_owner_id owner_id, acpi_handle start_handle);
-#endif                          /* ACPI_FUTURE_USAGE */
 
 /*
  * nseval - Namespace evaluation functions
diff --git a/drivers/acpi/acpica/acparser.h b/drivers/acpi/acpica/acparser.h
index 6021ccfb0b1c..8fc8c7cea879 100644
--- a/drivers/acpi/acpica/acparser.h
+++ b/drivers/acpi/acpica/acparser.h
@@ -194,10 +194,8 @@ union acpi_parse_object *acpi_ps_find(union acpi_parse_object *scope,
 
 union acpi_parse_object *acpi_ps_get_arg(union acpi_parse_object *op, u32 argn);
 
-#ifdef  ACPI_FUTURE_USAGE
 union acpi_parse_object *acpi_ps_get_depth_next(union acpi_parse_object *origin,
                                                 union acpi_parse_object *op);
-#endif                          /* ACPI_FUTURE_USAGE */
 
 /*
  * pswalk - parse tree walk routines
@@ -235,9 +233,7 @@ void acpi_ps_free_op(union acpi_parse_object *op);
 
 u8 acpi_ps_is_leading_char(u32 c);
 
-#ifdef  ACPI_FUTURE_USAGE
 u32 acpi_ps_get_name(union acpi_parse_object *op);
-#endif                          /* ACPI_FUTURE_USAGE */
 
 void acpi_ps_set_name(union acpi_parse_object *op, u32 name);
 
diff --git a/drivers/acpi/acpica/acutils.h b/drivers/acpi/acpica/acutils.h
index fb2aa5066f3f..8b8fef6cc32d 100644
--- a/drivers/acpi/acpica/acutils.h
+++ b/drivers/acpi/acpica/acutils.h
@@ -635,9 +635,7 @@ void
 acpi_ut_free_and_track(void *address,
                        u32 component, const char *module, u32 line);
 
-#ifdef  ACPI_FUTURE_USAGE
 void acpi_ut_dump_allocation_info(void);
-#endif                          /* ACPI_FUTURE_USAGE */
 
 void acpi_ut_dump_allocations(u32 component, const char *module);
 
diff --git a/drivers/acpi/acpica/evxface.c b/drivers/acpi/acpica/evxface.c
index 81f2d9e87fad..07d22bfbaa00 100644
--- a/drivers/acpi/acpica/evxface.c
+++ b/drivers/acpi/acpica/evxface.c
@@ -405,7 +405,7 @@ cleanup:
 }
 
 ACPI_EXPORT_SYMBOL(acpi_install_exception_handler)
-#endif                          /*  ACPI_FUTURE_USAGE  */
+#endif
 
 #if (!ACPI_REDUCED_HARDWARE)
 /*******************************************************************************
diff --git a/drivers/acpi/acpica/nsdump.c b/drivers/acpi/acpica/nsdump.c
index 0f1daba640e7..37aa5c45ca4b 100644
--- a/drivers/acpi/acpica/nsdump.c
+++ b/drivers/acpi/acpica/nsdump.c
@@ -60,7 +60,6 @@ acpi_ns_dump_one_device(acpi_handle obj_handle,
 
 #if defined(ACPI_DEBUG_OUTPUT) || defined(ACPI_DEBUGGER)
 
-#ifdef  ACPI_FUTURE_USAGE
 static acpi_status
 acpi_ns_dump_one_object_path(acpi_handle obj_handle,
                              u32 level, void *context, void **return_value);
@@ -68,7 +67,6 @@ acpi_ns_dump_one_object_path(acpi_handle obj_handle,
 static acpi_status
 acpi_ns_get_max_depth(acpi_handle obj_handle,
                       u32 level, void *context, void **return_value);
-#endif                          /* ACPI_FUTURE_USAGE */
 
 /*******************************************************************************
  *
@@ -625,7 +623,6 @@ cleanup:
         return (AE_OK);
 }
 
-#ifdef ACPI_FUTURE_USAGE
 /*******************************************************************************
  *
  * FUNCTION:    acpi_ns_dump_objects
@@ -680,9 +677,7 @@ acpi_ns_dump_objects(acpi_object_type type,
 
         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 }
-#endif                          /* ACPI_FUTURE_USAGE */
 
-#ifdef  ACPI_FUTURE_USAGE
 /*******************************************************************************
  *
  * FUNCTION:    acpi_ns_dump_one_object_path, acpi_ns_get_max_depth
@@ -810,7 +805,6 @@ acpi_ns_dump_object_paths(acpi_object_type type,
 
         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 }
-#endif                          /* ACPI_FUTURE_USAGE */
 
 /*******************************************************************************
  *
diff --git a/drivers/acpi/acpica/pstree.c b/drivers/acpi/acpica/pstree.c
index 89984f30addc..cf2f2faf4f92 100644
--- a/drivers/acpi/acpica/pstree.c
+++ b/drivers/acpi/acpica/pstree.c
@@ -183,7 +183,6 @@ acpi_ps_append_arg(union acpi_parse_object *op, union acpi_parse_object *arg)
         }
 }
 
-#ifdef ACPI_FUTURE_USAGE
 /*******************************************************************************
  *
  * FUNCTION:    acpi_ps_get_depth_next
@@ -317,4 +316,3 @@ union acpi_parse_object *acpi_ps_get_child(union acpi_parse_object *op)
         return (child);
 }
 #endif
-#endif                          /*  ACPI_FUTURE_USAGE  */
diff --git a/drivers/acpi/acpica/psutils.c b/drivers/acpi/acpica/psutils.c
index 183cc1efbc51..71d2877cd2ce 100644
--- a/drivers/acpi/acpica/psutils.c
+++ b/drivers/acpi/acpica/psutils.c
@@ -205,7 +205,6 @@ u8 acpi_ps_is_leading_char(u32 c)
 /*
  * Get op's name (4-byte name segment) or 0 if unnamed
  */
-#ifdef ACPI_FUTURE_USAGE
 u32 acpi_ps_get_name(union acpi_parse_object * op)
 {
 
@@ -219,7 +218,6 @@ u32 acpi_ps_get_name(union acpi_parse_object * op)
 
         return (op->named.name);
 }
-#endif                          /*  ACPI_FUTURE_USAGE  */
 
 /*
  * Set op's name
diff --git a/drivers/acpi/acpica/rsutils.c b/drivers/acpi/acpica/rsutils.c
index 52b024df0052..9486992edbb8 100644
--- a/drivers/acpi/acpica/rsutils.c
+++ b/drivers/acpi/acpica/rsutils.c
@@ -564,7 +564,6 @@ acpi_rs_get_crs_method_data(struct acpi_namespace_node *node,
  *
  ******************************************************************************/
 
-#ifdef ACPI_FUTURE_USAGE
 acpi_status
 acpi_rs_get_prs_method_data(struct acpi_namespace_node *node,
                             struct acpi_buffer *ret_buffer)
@@ -596,7 +595,6 @@ acpi_rs_get_prs_method_data(struct acpi_namespace_node *node,
         acpi_ut_remove_reference(obj_desc);
         return_ACPI_STATUS(status);
 }
-#endif                          /*  ACPI_FUTURE_USAGE  */
 
 /*******************************************************************************
  *
diff --git a/drivers/acpi/acpica/rsxface.c b/drivers/acpi/acpica/rsxface.c
index de51f836ef68..1e8cd5723326 100644
--- a/drivers/acpi/acpica/rsxface.c
+++ b/drivers/acpi/acpica/rsxface.c
@@ -220,7 +220,7 @@ acpi_get_current_resources(acpi_handle device_handle,
 }
 
 ACPI_EXPORT_SYMBOL(acpi_get_current_resources)
-#ifdef ACPI_FUTURE_USAGE
+
 /*******************************************************************************
  *
  * FUNCTION:    acpi_get_possible_resources
@@ -262,7 +262,7 @@ acpi_get_possible_resources(acpi_handle device_handle,
 }
 
 ACPI_EXPORT_SYMBOL(acpi_get_possible_resources)
-#endif                          /*  ACPI_FUTURE_USAGE  */
+
 /*******************************************************************************
  *
  * FUNCTION:    acpi_set_current_resources
diff --git a/drivers/acpi/acpica/utxface.c b/drivers/acpi/acpica/utxface.c
index a6b0eb034fc0..f9c8f9ce1f0f 100644
--- a/drivers/acpi/acpica/utxface.c
+++ b/drivers/acpi/acpica/utxface.c
@@ -253,7 +253,7 @@ acpi_install_initialization_handler(acpi_init_handler handler, u32 function)
 }
 
 ACPI_EXPORT_SYMBOL(acpi_install_initialization_handler)
-#endif                          /*  ACPI_FUTURE_USAGE  */
+#endif
 
 /*****************************************************************************
  *
diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c
index 739a4a6b3b9b..327291586f84 100644
--- a/drivers/acpi/osl.c
+++ b/drivers/acpi/osl.c
@@ -66,8 +66,6 @@ struct acpi_os_dpc {
 /* stuff for debugger support */
 int acpi_in_debugger;
 EXPORT_SYMBOL(acpi_in_debugger);
-
-extern char line_buf[80];
 #endif                          /*ENABLE_DEBUGGER */
 
 static int (*__acpi_os_prepare_sleep)(u8 sleep_state, u32 pm1a_ctrl,
@@ -1345,15 +1343,13 @@ acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
         return AE_OK;
 }
 
-#ifdef ACPI_FUTURE_USAGE
-u32 acpi_os_get_line(char *buffer)
+acpi_status acpi_os_get_line(char *buffer, u32 buffer_length, u32 *bytes_read)
 {
-
 #ifdef ENABLE_DEBUGGER
         if (acpi_in_debugger) {
                 u32 chars;
 
-                kdb_read(buffer, sizeof(line_buf));
+                kdb_read(buffer, buffer_length);
 
                 /* remove the CR kdb includes */
                 chars = strlen(buffer) - 1;
@@ -1361,9 +1357,8 @@ u32 acpi_os_get_line(char *buffer)
         }
 #endif
 
-        return 0;
+        return AE_OK;
 }
-#endif                          /*  ACPI_FUTURE_USAGE  */
 
 acpi_status acpi_os_signal(u32 function, void *info)
 {
diff --git a/include/acpi/acpixf.h b/include/acpi/acpixf.h
index f837adf15477..ded9fa3d7194 100644
--- a/include/acpi/acpixf.h
+++ b/include/acpi/acpixf.h
@@ -393,15 +393,11 @@ ACPI_EXTERNAL_RETURN_STATUS(acpi_status __init acpi_terminate(void))
  */
 ACPI_HW_DEPENDENT_RETURN_STATUS(acpi_status acpi_enable(void))
 ACPI_HW_DEPENDENT_RETURN_STATUS(acpi_status acpi_disable(void))
-#ifdef ACPI_FUTURE_USAGE
 ACPI_EXTERNAL_RETURN_STATUS(acpi_status acpi_subsystem_status(void))
-#endif
 
-#ifdef ACPI_FUTURE_USAGE
 ACPI_EXTERNAL_RETURN_STATUS(acpi_status
                             acpi_get_system_info(struct acpi_buffer
                                                  *ret_buffer))
-#endif
 ACPI_EXTERNAL_RETURN_STATUS(acpi_status
                              acpi_get_statistics(struct acpi_statistics *stats))
 ACPI_EXTERNAL_RETURN_PTR(const char
@@ -625,11 +621,9 @@ ACPI_EXTERNAL_RETURN_STATUS(acpi_status
                                                                space_id,
                                                                acpi_adr_space_handler
                                                                handler))
-#ifdef ACPI_FUTURE_USAGE
 ACPI_EXTERNAL_RETURN_STATUS(acpi_status
                              acpi_install_exception_handler
                              (acpi_exception_handler handler))
-#endif
 ACPI_EXTERNAL_RETURN_STATUS(acpi_status
                              acpi_install_interface_handler
                              (acpi_interface_handler handler))
@@ -750,12 +744,10 @@ ACPI_EXTERNAL_RETURN_STATUS(acpi_status
                              acpi_get_current_resources(acpi_handle device,
                                                         struct acpi_buffer
                                                         *ret_buffer))
-#ifdef ACPI_FUTURE_USAGE
 ACPI_EXTERNAL_RETURN_STATUS(acpi_status
                              acpi_get_possible_resources(acpi_handle device,
                                                          struct acpi_buffer
                                                          *ret_buffer))
-#endif
 ACPI_EXTERNAL_RETURN_STATUS(acpi_status
                              acpi_get_event_resources(acpi_handle device_handle,
                                                       struct acpi_buffer
@@ -844,7 +836,6 @@ ACPI_HW_DEPENDENT_RETURN_STATUS(acpi_status
 /*
  * ACPI Timer interfaces
  */
-#ifdef ACPI_FUTURE_USAGE
 ACPI_HW_DEPENDENT_RETURN_STATUS(acpi_status
                                 acpi_get_timer_resolution(u32 *resolution))
 ACPI_HW_DEPENDENT_RETURN_STATUS(acpi_status acpi_get_timer(u32 *ticks))
@@ -853,7 +844,6 @@ ACPI_HW_DEPENDENT_RETURN_STATUS(acpi_status
                                 acpi_get_timer_duration(u32 start_ticks,
                                                         u32 end_ticks,
                                                         u32 *time_elapsed))
-#endif                          /* ACPI_FUTURE_USAGE */
 
 /*
  * Error/Warning output
diff --git a/include/acpi/platform/aclinux.h b/include/acpi/platform/aclinux.h
index 74ba46c8157a..323e5daece54 100644
--- a/include/acpi/platform/aclinux.h
+++ b/include/acpi/platform/aclinux.h
@@ -63,12 +63,16 @@
 
 #define ACPI_USE_SYSTEM_INTTYPES
 
-/* Compile for reduced hardware mode only with this kernel config */
+/* Kernel specific ACPICA configuration */
 
 #ifdef CONFIG_ACPI_REDUCED_HARDWARE_ONLY
 #define ACPI_REDUCED_HARDWARE 1
 #endif
 
+#ifdef CONFIG_ACPI_DEBUGGER
+#define ACPI_DEBUGGER
+#endif
+
 #include <linux/string.h>
 #include <linux/kernel.h>
 #include <linux/ctype.h>
@@ -151,7 +155,6 @@
  * OSL interfaces used by utilities
  */
 #define ACPI_USE_ALTERNATE_PROTOTYPE_acpi_os_redirect_output
-#define ACPI_USE_ALTERNATE_PROTOTYPE_acpi_os_get_line
 #define ACPI_USE_ALTERNATE_PROTOTYPE_acpi_os_get_table_by_name
 #define ACPI_USE_ALTERNATE_PROTOTYPE_acpi_os_get_table_by_index
 #define ACPI_USE_ALTERNATE_PROTOTYPE_acpi_os_get_table_by_address
diff --git a/include/acpi/platform/aclinuxex.h b/include/acpi/platform/aclinuxex.h
index acedc3f026de..fd6d70fe1219 100644
--- a/include/acpi/platform/aclinuxex.h
+++ b/include/acpi/platform/aclinuxex.h
@@ -124,6 +124,11 @@ static inline acpi_thread_id acpi_os_get_thread_id(void)
                 lock ? AE_OK : AE_NO_MEMORY; \
         })
 
+static inline u8 acpi_os_readable(void *pointer, acpi_size length)
+{
+        return TRUE;
+}
+
 /*
  * OSL interfaces added by Linux
  */