ACPICA: Implemented full argument resolution support for the BankValue argument to BankField
Previously, only constants were supported, now any TermArg may
be used.
http://www.acpica.org/bugzilla/show_bug.cgi?id=387
http://www.acpica.org/bugzilla/show_bug.cgi?id=393
Signed-off-by: Lin Ming <ming.m.lin@intel.com>
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Alexey Starikovskiy <astarikovskiy@suse.de>
Signed-off-by: Len Brown <len.brown@intel.com>
diff --git a/drivers/acpi/dispatcher/dsfield.c b/drivers/acpi/dispatcher/dsfield.c
index f049639..e87f6bf 100644
--- a/drivers/acpi/dispatcher/dsfield.c
+++ b/drivers/acpi/dispatcher/dsfield.c
@@ -281,11 +281,17 @@
arg->common.node = info->field_node;
info->field_bit_length = arg->common.value.size;
- /* Create and initialize an object for the new Field Node */
-
- status = acpi_ex_prep_field_value(info);
- if (ACPI_FAILURE(status)) {
- return_ACPI_STATUS(status);
+ /*
+ * If there is no object attached to the node, this node was just created
+ * and we need to create the field object. Otherwise, this was a lookup
+ * of an existing node and we don't want to create the field object again.
+ */
+ if (!acpi_ns_get_attached_object
+ (info->field_node)) {
+ status = acpi_ex_prep_field_value(info);
+ if (ACPI_FAILURE(status)) {
+ return_ACPI_STATUS(status);
+ }
}
}
@@ -399,9 +405,22 @@
union acpi_parse_object *arg = NULL;
struct acpi_namespace_node *node;
u8 type = 0;
+ u32 flags;
ACPI_FUNCTION_TRACE_PTR(ds_init_field_objects, op);
+ /*
+ * During the load phase, we want to enter the name of the field into
+ * the namespace. During the execute phase (when we evaluate the bank_value
+ * operand), we want to lookup the name.
+ */
+ if (walk_state->deferred_node) {
+ flags = ACPI_NS_NO_UPSEARCH | ACPI_NS_DONT_OPEN_SCOPE;
+ } else {
+ flags = ACPI_NS_NO_UPSEARCH | ACPI_NS_DONT_OPEN_SCOPE |
+ ACPI_NS_ERROR_IF_FOUND;
+ }
+
switch (walk_state->opcode) {
case AML_FIELD_OP:
arg = acpi_ps_get_arg(op, 2);
@@ -433,10 +452,7 @@
status = acpi_ns_lookup(walk_state->scope_info,
(char *)&arg->named.name,
type, ACPI_IMODE_LOAD_PASS1,
- ACPI_NS_NO_UPSEARCH |
- ACPI_NS_DONT_OPEN_SCOPE |
- ACPI_NS_ERROR_IF_FOUND,
- walk_state, &node);
+ flags, walk_state, &node);
if (ACPI_FAILURE(status)) {
ACPI_ERROR_NAMESPACE((char *)&arg->named.name,
status);
@@ -466,7 +482,7 @@
*
* PARAMETERS: Op - Op containing the Field definition and args
* region_node - Object for the containing Operation Region
- * ` walk_state - Current method state
+ * walk_state - Current method state
*
* RETURN: Status
*
@@ -513,36 +529,13 @@
return_ACPI_STATUS(status);
}
- /* Third arg is the bank_value */
-
- /* TBD: This arg is a term_arg, not a constant, and must be evaluated */
-
+ /*
+ * Third arg is the bank_value
+ * This arg is a term_arg, not a constant
+ * It will be evaluated later, by acpi_ds_eval_bank_field_operands
+ */
arg = arg->common.next;
- /* Currently, only the following constants are supported */
-
- switch (arg->common.aml_opcode) {
- case AML_ZERO_OP:
- info.bank_value = 0;
- break;
-
- case AML_ONE_OP:
- info.bank_value = 1;
- break;
-
- case AML_BYTE_OP:
- case AML_WORD_OP:
- case AML_DWORD_OP:
- case AML_QWORD_OP:
- info.bank_value = (u32) arg->common.value.integer;
- break;
-
- default:
- info.bank_value = 0;
- ACPI_ERROR((AE_INFO,
- "Non-constant BankValue for BankField is not implemented"));
- }
-
/* Fourth arg is the field flags */
arg = arg->common.next;
@@ -553,8 +546,17 @@
info.field_type = ACPI_TYPE_LOCAL_BANK_FIELD;
info.region_node = region_node;
- status = acpi_ds_get_field_names(&info, walk_state, arg->common.next);
+ /*
+ * Use Info.data_register_node to store bank_field Op
+ * It's safe because data_register_node will never be used when create bank field
+ * We store aml_start and aml_length in the bank_field Op for late evaluation
+ * Used in acpi_ex_prep_field_value(Info)
+ *
+ * TBD: Or, should we add a field in struct acpi_create_field_info, like "void *ParentOp"?
+ */
+ info.data_register_node = (struct acpi_namespace_node *)op;
+ status = acpi_ds_get_field_names(&info, walk_state, arg->common.next);
return_ACPI_STATUS(status);
}