Commit 22b5afce authored by Bob Moore's avatar Bob Moore Committed by Rafael J. Wysocki

ACPICA: Add auto-serialization support for ill-behaved control methods.

This change adds support to automatically mark a control method as
"serialized" if the method creates any named objects. This will
positively prevent the method from being entered by more than one
thread and thus preventing a possible abort when an attempt is
made to create an object twice.

Implemented by parsing all non-serialize control methods at table
load time.

This feature is disabled by default and this patch also adds a new
Linux kernel parameter "acpi_auto_serialize" to allow this feature
to be turned on for a specific boot.

References: https://bugzilla.kernel.org/show_bug.cgi?id=52191Signed-off-by: default avatarBob Moore <robert.moore@intel.com>
Signed-off-by: default avatarLv Zheng <lv.zheng@intel.com>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent e2b8ddcc
......@@ -229,6 +229,14 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
use by PCI
Format: <irq>,<irq>...
acpi_auto_serialize [HW,ACPI]
Enable auto-serialization of AML methods
AML control methods that contain the opcodes to create
named objects will be marked as "Serialized" by the
auto-serialization feature.
This feature is disabled by default.
This option allows to turn on the feature.
acpi_no_auto_ssdt [HW,ACPI] Disable automatic loading of SSDT
acpica_no_return_repair [HW, ACPI]
......
......@@ -139,20 +139,21 @@ acpi_ds_init_field_objects(union acpi_parse_object *op,
struct acpi_walk_state *walk_state);
/*
* dsload - Parser/Interpreter interface, pass 1 namespace load callbacks
* dsload - Parser/Interpreter interface
*/
acpi_status
acpi_ds_init_callbacks(struct acpi_walk_state *walk_state, u32 pass_number);
/* dsload - pass 1 namespace load callbacks */
acpi_status
acpi_ds_load1_begin_op(struct acpi_walk_state *walk_state,
union acpi_parse_object **out_op);
acpi_status acpi_ds_load1_end_op(struct acpi_walk_state *walk_state);
/*
* dsload - Parser/Interpreter interface, pass 2 namespace load callbacks
*/
/* dsload - pass 2 namespace load callbacks */
acpi_status
acpi_ds_load2_begin_op(struct acpi_walk_state *walk_state,
union acpi_parse_object **out_op);
......@@ -200,7 +201,9 @@ void acpi_ds_method_data_init(struct acpi_walk_state *walk_state);
/*
* dsmethod - Parser/Interpreter interface - control method parsing
*/
acpi_status acpi_ds_parse_method(struct acpi_namespace_node *node);
acpi_status
acpi_ds_auto_serialize_method(struct acpi_namespace_node *node,
union acpi_operand_object *obj_desc);
acpi_status
acpi_ds_call_control_method(struct acpi_thread_state *thread,
......
......@@ -92,6 +92,15 @@
*/
ACPI_INIT_GLOBAL(u8, acpi_gbl_enable_interpreter_slack, FALSE);
/*
* Automatically serialize all methods that create named objects? Default
* is TRUE, meaning that all non_serialized methods are scanned once at
* table load time to determine those that create named objects. Methods
* that create named objects are marked Serialized in order to prevent
* possible run-time problems if they are entered by more than one thread.
*/
ACPI_INIT_GLOBAL(u8, acpi_gbl_auto_serialize_methods, FALSE);
/*
* Create the predefined _OSI method in the namespace? Default is TRUE
* because ACPI CA is fully compatible with other ACPI implementations.
......
......@@ -133,6 +133,9 @@ struct acpi_init_walk_info {
u32 table_index;
u32 object_count;
u32 method_count;
u32 serial_method_count;
u32 non_serial_method_count;
u32 serialized_method_count;
u32 device_count;
u32 op_region_count;
u32 field_count;
......
......@@ -83,8 +83,8 @@ acpi_ds_init_one_object(acpi_handle obj_handle,
(struct acpi_init_walk_info *)context;
struct acpi_namespace_node *node =
(struct acpi_namespace_node *)obj_handle;
acpi_object_type type;
acpi_status status;
union acpi_operand_object *obj_desc;
ACPI_FUNCTION_ENTRY();
......@@ -100,9 +100,7 @@ acpi_ds_init_one_object(acpi_handle obj_handle,
/* And even then, we are only interested in a few object types */
type = acpi_ns_get_type(obj_handle);
switch (type) {
switch (acpi_ns_get_type(obj_handle)) {
case ACPI_TYPE_REGION:
status = acpi_ds_initialize_region(obj_handle);
......@@ -117,8 +115,44 @@ acpi_ds_init_one_object(acpi_handle obj_handle,
break;
case ACPI_TYPE_METHOD:
/*
* Auto-serialization support. We will examine each method that is
* not_serialized to determine if it creates any Named objects. If
* it does, it will be marked serialized to prevent problems if
* the method is entered by two or more threads and an attempt is
* made to create the same named object twice -- which results in
* an AE_ALREADY_EXISTS exception and method abort.
*/
info->method_count++;
obj_desc = acpi_ns_get_attached_object(node);
if (!obj_desc) {
break;
}
/* Ignore if already serialized */
if (obj_desc->method.info_flags & ACPI_METHOD_SERIALIZED) {
info->serial_method_count++;
break;
}
if (acpi_gbl_auto_serialize_methods) {
/* Parse/scan method and serialize it if necessary */
acpi_ds_auto_serialize_method(node, obj_desc);
if (obj_desc->method.
info_flags & ACPI_METHOD_SERIALIZED) {
/* Method was just converted to Serialized */
info->serial_method_count++;
info->serialized_method_count++;
break;
}
}
info->non_serial_method_count++;
break;
case ACPI_TYPE_DEVICE:
......@@ -170,7 +204,6 @@ acpi_ds_initialize_objects(u32 table_index,
ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
"**** Starting initialization of namespace objects ****\n"));
ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT, "Parsing all Control Methods:"));
/* Set all init info to zero */
......@@ -205,14 +238,16 @@ acpi_ds_initialize_objects(u32 table_index,
}
ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT,
"\nTable [%4.4s](id %4.4X) - %u Objects with %u Devices %u Methods %u Regions\n",
"Table [%4.4s] (id %4.4X) - %4u Objects with %3u Devices, "
"%3u Regions, %3u Methods (%u/%u/%u Serial/Non/Cvt)\n",
table->signature, owner_id, info.object_count,
info.device_count, info.method_count,
info.op_region_count));
info.device_count, info.op_region_count,
info.method_count, info.serial_method_count,
info.non_serial_method_count,
info.serialized_method_count));
ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
"%u Methods, %u Regions\n", info.method_count,
info.op_region_count));
ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "%u Methods, %u Regions\n",
info.method_count, info.op_region_count));
return_ACPI_STATUS(AE_OK);
}
......@@ -49,14 +49,144 @@
#ifdef ACPI_DISASSEMBLER
#include "acdisasm.h"
#endif
#include "acparser.h"
#include "amlcode.h"
#define _COMPONENT ACPI_DISPATCHER
ACPI_MODULE_NAME("dsmethod")
/* Local prototypes */
static acpi_status
acpi_ds_detect_named_opcodes(struct acpi_walk_state *walk_state,
union acpi_parse_object **out_op);
static acpi_status
acpi_ds_create_method_mutex(union acpi_operand_object *method_desc);
/*******************************************************************************
*
* FUNCTION: acpi_ds_auto_serialize_method
*
* PARAMETERS: node - Namespace Node of the method
* obj_desc - Method object attached to node
*
* RETURN: Status
*
* DESCRIPTION: Parse a control method AML to scan for control methods that
* need serialization due to the creation of named objects.
*
* NOTE: It is a bit of overkill to mark all such methods serialized, since
* there is only a problem if the method actually blocks during execution.
* A blocking operation is, for example, a Sleep() operation, or any access
* to an operation region. However, it is probably not possible to easily
* detect whether a method will block or not, so we simply mark all suspicious
* methods as serialized.
*
* NOTE2: This code is essentially a generic routine for parsing a single
* control method.
*
******************************************************************************/
acpi_status
acpi_ds_auto_serialize_method(struct acpi_namespace_node *node,
union acpi_operand_object *obj_desc)
{
acpi_status status;
union acpi_parse_object *op = NULL;
struct acpi_walk_state *walk_state;
ACPI_FUNCTION_TRACE_PTR(ds_auto_serialize_method, node);
ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
"Method auto-serialization parse [%4.4s] %p\n",
acpi_ut_get_node_name(node), node));
/* Create/Init a root op for the method parse tree */
op = acpi_ps_alloc_op(AML_METHOD_OP);
if (!op) {
return_ACPI_STATUS(AE_NO_MEMORY);
}
acpi_ps_set_name(op, node->name.integer);
op->common.node = node;
/* Create and initialize a new walk state */
walk_state =
acpi_ds_create_walk_state(node->owner_id, NULL, NULL, NULL);
if (!walk_state) {
return_ACPI_STATUS(AE_NO_MEMORY);
}
status =
acpi_ds_init_aml_walk(walk_state, op, node,
obj_desc->method.aml_start,
obj_desc->method.aml_length, NULL, 0);
if (ACPI_FAILURE(status)) {
acpi_ds_delete_walk_state(walk_state);
return_ACPI_STATUS(status);
}
walk_state->descending_callback = acpi_ds_detect_named_opcodes;
/* Parse the method, scan for creation of named objects */
status = acpi_ps_parse_aml(walk_state);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
acpi_ps_delete_parse_tree(op);
return_ACPI_STATUS(status);
}
/*******************************************************************************
*
* FUNCTION: acpi_ds_detect_named_opcodes
*
* PARAMETERS: walk_state - Current state of the parse tree walk
* out_op - Unused, required for parser interface
*
* RETURN: Status
*
* DESCRIPTION: Descending callback used during the loading of ACPI tables.
* Currently used to detect methods that must be marked serialized
* in order to avoid problems with the creation of named objects.
*
******************************************************************************/
static acpi_status
acpi_ds_detect_named_opcodes(struct acpi_walk_state *walk_state,
union acpi_parse_object **out_op)
{
ACPI_FUNCTION_NAME(acpi_ds_detect_named_opcodes);
/* We are only interested in opcodes that have an associated name */
if (!(walk_state->op_info->flags & AML_NAMED)) {
return (AE_OK);
}
/*
* At this point, we know we have a Named object opcode.
* Mark the method as serialized. Later code will create a mutex for
* this method to enforce serialization.
*/
walk_state->method_desc->method.info_flags |= ACPI_METHOD_SERIALIZED;
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"Method serialized [%4.4s] %p - [%s] (%4.4X)\n",
walk_state->method_node->name.ascii,
walk_state->method_node, walk_state->op_info->name,
walk_state->opcode));
/* Abort the parse, no need to examine this method any further */
return (AE_CTRL_TERMINATE);
}
/*******************************************************************************
*
* FUNCTION: acpi_ds_method_error
......@@ -74,7 +204,7 @@ acpi_ds_create_method_mutex(union acpi_operand_object *method_desc);
******************************************************************************/
acpi_status
acpi_ds_method_error(acpi_status status, struct acpi_walk_state *walk_state)
acpi_ds_method_error(acpi_status status, struct acpi_walk_state * walk_state)
{
ACPI_FUNCTION_ENTRY();
......
......@@ -73,8 +73,20 @@ acpi_ds_init_callbacks(struct acpi_walk_state *walk_state, u32 pass_number)
{
switch (pass_number) {
case 0:
/* Parse only - caller will setup callbacks */
walk_state->parse_flags = ACPI_PARSE_LOAD_PASS1 |
ACPI_PARSE_DELETE_TREE | ACPI_PARSE_DISASSEMBLE;
walk_state->descending_callback = NULL;
walk_state->ascending_callback = NULL;
break;
case 1:
/* Load pass 1 */
walk_state->parse_flags = ACPI_PARSE_LOAD_PASS1 |
ACPI_PARSE_DELETE_TREE;
walk_state->descending_callback = acpi_ds_load1_begin_op;
......@@ -83,6 +95,8 @@ acpi_ds_init_callbacks(struct acpi_walk_state *walk_state, u32 pass_number)
case 2:
/* Load pass 2 */
walk_state->parse_flags = ACPI_PARSE_LOAD_PASS1 |
ACPI_PARSE_DELETE_TREE;
walk_state->descending_callback = acpi_ds_load2_begin_op;
......@@ -91,6 +105,8 @@ acpi_ds_init_callbacks(struct acpi_walk_state *walk_state, u32 pass_number)
case 3:
/* Execution pass */
#ifndef ACPI_NO_METHOD_EXECUTION
walk_state->parse_flags |= ACPI_PARSE_EXECUTE |
ACPI_PARSE_DELETE_TREE;
......
......@@ -111,9 +111,8 @@ acpi_status acpi_ns_initialize_objects(void)
info.object_count));
ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
"%u Control Methods found\n", info.method_count));
ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
"%u Op Regions found\n", info.op_region_count));
"%u Control Methods found\n%u Op Regions found\n",
info.method_count, info.op_region_count));
return_ACPI_STATUS(AE_OK);
}
......
......@@ -128,12 +128,12 @@ acpi_ns_load_table(u32 table_index, struct acpi_namespace_node *node)
* parse trees.
*/
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"**** Begin Table Method Parsing and Object Initialization\n"));
"**** Begin Table Object Initialization\n"));
status = acpi_ds_initialize_objects(table_index, node);
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"**** Completed Table Method Parsing and Object Initialization\n"));
"**** Completed Table Object Initialization\n"));
return_ACPI_STATUS(status);
}
......
......@@ -480,6 +480,10 @@ acpi_status acpi_ps_parse_loop(struct acpi_walk_state *walk_state)
status = AE_OK;
}
if (status == AE_CTRL_TERMINATE) {
return_ACPI_STATUS(status);
}
status =
acpi_ps_complete_op(walk_state, &op,
status);
......
......@@ -219,7 +219,10 @@ acpi_ps_build_named_op(struct acpi_walk_state *walk_state,
status = walk_state->descending_callback(walk_state, op);
if (ACPI_FAILURE(status)) {
ACPI_EXCEPTION((AE_INFO, status, "During name lookup/catalog"));
if (status != AE_CTRL_TERMINATE) {
ACPI_EXCEPTION((AE_INFO, status,
"During name lookup/catalog"));
}
return_ACPI_STATUS(status);
}
......@@ -230,7 +233,7 @@ acpi_ps_build_named_op(struct acpi_walk_state *walk_state,
status = acpi_ps_next_parse_state(walk_state, *op, status);
if (ACPI_FAILURE(status)) {
if (status == AE_CTRL_PENDING) {
return_ACPI_STATUS(AE_CTRL_PARSE_PENDING);
status = AE_CTRL_PARSE_PENDING;
}
return_ACPI_STATUS(status);
}
......
......@@ -1539,6 +1539,22 @@ static int __init osi_setup(char *str)
__setup("acpi_osi=", osi_setup);
/*
* Enable the auto-serialization of named objects creation methods.
*
* This feature is disabled by default. It marks the AML control methods
* that contain the opcodes to create named objects as "Serialized".
*/
static int __init acpi_auto_serialize_setup(char *str)
{
acpi_gbl_auto_serialize_methods = TRUE;
pr_info("ACPI: auto-serialization enabled\n");
return 1;
}
__setup("acpi_auto_serialize", acpi_auto_serialize_setup);
/* Check of resource interference between native drivers and ACPI
* OperationRegions (SystemIO and System Memory only).
* IO ports and memory declared in ACPI might be used by the ACPI subsystem
......
......@@ -71,6 +71,7 @@ extern u32 acpi_dbg_layer;
/* ACPICA runtime options */
extern u8 acpi_gbl_auto_serialize_methods;
extern u8 acpi_gbl_copy_dsdt_locally;
extern u8 acpi_gbl_create_osi_method;
extern u8 acpi_gbl_disable_auto_repair;
......
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