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ACPICA: Namespace: Add support to allow overriding objects 

ACPICA commit 6084e34e44565c6293f446c0202b5e59b055e351

This patch adds an "NamespaceOverride" flag in struct acpi_walk_state, and allows
namespace objects to be overridden when this flag is set. Lv Zheng.

Link: https://github.com/acpica/acpica/commit/6084e34e
Signed-off-by: Lv Zheng <lv.zheng@intel.com>
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Lv Zheng 2015-07-01 14:44:17 +08:00 committed by Rafael J. Wysocki
parent a8bd0f07eb
commit 8f6f036104
5 changed files with 44 additions and 7 deletions
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1
drivers/acpi/acpica/acnamesp.h
View File

@ -66,6 +66,7 @@
#define ACPI_NS_PREFIX_IS_SCOPE 0x10
#define ACPI_NS_EXTERNAL 0x20
#define ACPI_NS_TEMPORARY 0x40
#define ACPI_NS_OVERRIDE_IF_FOUND 0x80
/* Flags for acpi_ns_walk_namespace */

1
drivers/acpi/acpica/acstruct.h
View File

@ -82,6 +82,7 @@ struct acpi_walk_state {
u8 return_used;
u8 scope_depth;
u8 pass_number; /* Parse pass during table load */
u8 namespace_override; /* Override existing objects */
u8 result_size; /* Total elements for the result stack */
u8 result_count; /* Current number of occupied elements of result stack */
u32 aml_offset;

17
drivers/acpi/acpica/dswload.c
View File

@ -315,10 +315,19 @@ acpi_ds_load1_begin_op(struct acpi_walk_state * walk_state,
flags = ACPI_NS_NO_UPSEARCH;
if ((walk_state->opcode != AML_SCOPE_OP) &&
(!(walk_state->parse_flags & ACPI_PARSE_DEFERRED_OP))) {
flags |= ACPI_NS_ERROR_IF_FOUND;
ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
"[%s] Cannot already exist\n",
acpi_ut_get_type_name(object_type)));
if (walk_state->namespace_override) {
flags |= ACPI_NS_OVERRIDE_IF_FOUND;
ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
"[%s] Override allowed\n",
acpi_ut_get_type_name
(object_type)));
} else {
flags |= ACPI_NS_ERROR_IF_FOUND;
ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
"[%s] Cannot already exist\n",
acpi_ut_get_type_name
(object_type)));
}
} else {
ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
"[%s] Both Find or Create allowed\n",

10
drivers/acpi/acpica/nsaccess.c
View File

@ -304,7 +304,9 @@ acpi_ns_lookup(union acpi_generic_state *scope_info,
return_ACPI_STATUS(AE_BAD_PARAMETER);
}
local_flags = flags & ~(ACPI_NS_ERROR_IF_FOUND | ACPI_NS_SEARCH_PARENT);
local_flags = flags &
~(ACPI_NS_ERROR_IF_FOUND | ACPI_NS_OVERRIDE_IF_FOUND |
ACPI_NS_SEARCH_PARENT);
*return_node = ACPI_ENTRY_NOT_FOUND;
acpi_gbl_ns_lookup_count++;
@ -547,6 +549,12 @@ acpi_ns_lookup(union acpi_generic_state *scope_info,
if (flags & ACPI_NS_ERROR_IF_FOUND) {
local_flags |= ACPI_NS_ERROR_IF_FOUND;
}
/* Set override flag according to caller */
if (flags & ACPI_NS_OVERRIDE_IF_FOUND) {
local_flags |= ACPI_NS_OVERRIDE_IF_FOUND;
}
}
/* Extract one ACPI name from the front of the pathname */

22
drivers/acpi/acpica/nssearch.c
View File

@ -325,8 +325,26 @@ acpi_ns_search_and_enter(u32 target_name,
* If we found it AND the request specifies that a find is an error,
* return the error
*/
if ((status == AE_OK) && (flags & ACPI_NS_ERROR_IF_FOUND)) {
status = AE_ALREADY_EXISTS;
if (status == AE_OK) {
/* The node was found in the namespace */
/*
* If the namespace override feature is enabled for this node,
* delete any existing node. This can only happen during the
* boot stage, thus it is safe to remove the node here.
*/
if (flags & ACPI_NS_OVERRIDE_IF_FOUND) {
acpi_ns_delete_children(*return_node);
acpi_ns_remove_node(*return_node);
*return_node = ACPI_ENTRY_NOT_FOUND;
}
/* Return an error if we don't expect to find the object */
else if (flags & ACPI_NS_ERROR_IF_FOUND) {
status = AE_ALREADY_EXISTS;
}
}
#ifdef ACPI_ASL_COMPILER
if (*return_node && (*return_node)->type == ACPI_TYPE_ANY) {