diff options
Diffstat (limited to 'drivers/acpi/acpica/dsmethod.c')
| -rw-r--r-- | drivers/acpi/acpica/dsmethod.c | 156 |
1 files changed, 151 insertions, 5 deletions
diff --git a/drivers/acpi/acpica/dsmethod.c b/drivers/acpi/acpica/dsmethod.c index 2c6d42c2bc01..3c7f7378b94d 100644 --- a/drivers/acpi/acpica/dsmethod.c +++ b/drivers/acpi/acpica/dsmethod.c @@ -49,16 +49,155 @@ #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 create a new name */ + + if (! + (walk_state->op_info-> + flags & (AML_NAMED | AML_CREATE | AML_FIELD))) { + 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. + * + * Note, ACPI_METHOD_IGNORE_SYNC_LEVEL flag means that we will ignore the + * Sync Level mechanism for this method, even though it is now serialized. + * Otherwise, there can be conflicts with existing ASL code that actually + * uses sync levels. + */ + walk_state->method_desc->method.sync_level = 0; + walk_state->method_desc->method.info_flags |= + (ACPI_METHOD_SERIALIZED | ACPI_METHOD_IGNORE_SYNC_LEVEL); + + 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 * * PARAMETERS: status - Execution status @@ -74,7 +213,7 @@ 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(); @@ -217,13 +356,19 @@ acpi_ds_begin_method_execution(struct acpi_namespace_node *method_node, /* * The current_sync_level (per-thread) must be less than or equal to * the sync level of the method. This mechanism provides some - * deadlock prevention + * deadlock prevention. + * + * If the method was auto-serialized, we just ignore the sync level + * mechanism, because auto-serialization of methods can interfere + * with ASL code that actually uses sync levels. * * Top-level method invocation has no walk state at this point */ if (walk_state && - (walk_state->thread->current_sync_level > - obj_desc->method.mutex->mutex.sync_level)) { + (!(obj_desc->method. + info_flags & ACPI_METHOD_IGNORE_SYNC_LEVEL)) + && (walk_state->thread->current_sync_level > + obj_desc->method.mutex->mutex.sync_level)) { ACPI_ERROR((AE_INFO, "Cannot acquire Mutex for method [%4.4s], current SyncLevel is too large (%u)", acpi_ut_get_node_name(method_node), @@ -668,7 +813,8 @@ acpi_ds_terminate_control_method(union acpi_operand_object *method_desc, method_desc->method.info_flags &= ~ACPI_METHOD_SERIALIZED_PENDING; method_desc->method.info_flags |= - ACPI_METHOD_SERIALIZED; + (ACPI_METHOD_SERIALIZED | + ACPI_METHOD_IGNORE_SYNC_LEVEL); method_desc->method.sync_level = 0; } |