This patch makes acpi_load_table() available
for use by removing it from the #ifdef ACPI_FUTURE_USAGE.
It also adds a new routine used to unload an ACPI table
of a given type and "id" - acpi_unload_table_id().
The implementation of this new routine was almost a direct
copy of existing routine acpi_unload_table() - only difference
being that it only removes a specific table id instead of
ALL tables of a given type.
The SN hotplug driver (sgi_hotplug.c) now uses both of these
interfaces to dynamically load and unload SSDT ACPI tables.
Also, a few other ACPI routines now used by the SN hotplug
driver are exported (since the driver can be a loadable module):
acpi_ns_map_handle_to_node
acpi_ns_convert_entry_to_handle
acpi_ns_get_next_node
Signed-off-by: Aaron Young <[email protected]>
---
Resend #1
Original send of this patch was outdated and did not have
acpi_ut_acquire_mutex() and acpi_ut_release_mutex() calls
in acpi_unload_table_id().
drivers/acpi/namespace/nsutils.c | 4 ++
drivers/acpi/namespace/nswalk.c | 2 +
drivers/acpi/tables/tbxface.c | 54 ++++++++++++++++++++++++++++-
include/acpi/acpixf.h | 5 +-
4 files changed, 62 insertions(+), 3 deletions(-)
Index: linux-2.6/drivers/acpi/namespace/nsutils.c
===================================================================
--- linux-2.6.orig/drivers/acpi/namespace/nsutils.c 2006-11-15 08:18:27.587345652 -0600
+++ linux-2.6/drivers/acpi/namespace/nsutils.c 2006-11-15 08:33:26.129843027 -0600
@@ -701,6 +701,8 @@ struct acpi_namespace_node *acpi_ns_map_
return (ACPI_CAST_PTR(struct acpi_namespace_node, handle));
}
+ACPI_EXPORT_SYMBOL(acpi_ns_map_handle_to_node)
+
/*******************************************************************************
*
* FUNCTION: acpi_ns_convert_entry_to_handle
@@ -737,6 +739,8 @@ acpi_handle acpi_ns_convert_entry_to_han
------------------------------------------------------*/
}
+ACPI_EXPORT_SYMBOL(acpi_ns_convert_entry_to_handle)
+
/*******************************************************************************
*
* FUNCTION: acpi_ns_terminate
Index: linux-2.6/drivers/acpi/namespace/nswalk.c
===================================================================
--- linux-2.6.orig/drivers/acpi/namespace/nswalk.c 2006-11-15 08:18:27.587345652 -0600
+++ linux-2.6/drivers/acpi/namespace/nswalk.c 2006-11-15 08:33:26.141845016 -0600
@@ -119,6 +119,8 @@ struct acpi_namespace_node *acpi_ns_get_
return (NULL);
}
+ACPI_EXPORT_SYMBOL(acpi_ns_get_next_node)
+
/*******************************************************************************
*
* FUNCTION: acpi_ns_walk_namespace
Index: linux-2.6/drivers/acpi/tables/tbxface.c
===================================================================
--- linux-2.6.orig/drivers/acpi/tables/tbxface.c 2006-11-15 08:18:27.635354917 -0600
+++ linux-2.6/drivers/acpi/tables/tbxface.c 2006-11-15 09:54:54.715023969 -0600
@@ -123,7 +123,6 @@ acpi_status acpi_load_tables(void)
ACPI_EXPORT_SYMBOL(acpi_load_tables)
-#ifdef ACPI_FUTURE_USAGE
/*******************************************************************************
*
* FUNCTION: acpi_load_table
@@ -221,6 +220,59 @@ ACPI_EXPORT_SYMBOL(acpi_load_table)
/*******************************************************************************
*
+ * FUNCTION: acpi_unload_table_id
+ *
+ * PARAMETERS: table_type - Type of table to be unloaded
+ * id - Owner ID of the table to be removed.
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: This routine is used to force the unload of a table (by id)
+ *
+ ******************************************************************************/
+acpi_status acpi_unload_table_id(acpi_table_type table_type, acpi_owner_id id)
+{
+ struct acpi_table_desc *table_desc;
+ acpi_status status;
+
+ ACPI_FUNCTION_TRACE(acpi_unload_table);
+
+ /* Parameter validation */
+ if (table_type > ACPI_TABLE_ID_MAX)
+ return_ACPI_STATUS(AE_BAD_PARAMETER);
+
+ /* Find table from the requested type list */
+ table_desc = acpi_gbl_table_lists[table_type].next;
+ while (table_desc && table_desc->owner_id != id)
+ table_desc = table_desc->next;
+
+ if (!table_desc)
+ return_ACPI_STATUS(AE_NOT_EXIST);
+
+ /*
+ * Delete all namespace objects owned by this table. Note that these
+ * objects can appear anywhere in the namespace by virtue of the AML
+ * "Scope" operator. Thus, we need to track ownership by an ID, not
+ * simply a position within the hierarchy
+ */
+ acpi_ns_delete_namespace_by_owner(table_desc->owner_id);
+
+ status = acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
+ if (ACPI_FAILURE(status))
+ return_ACPI_STATUS(status);
+
+ (void)acpi_tb_uninstall_table(table_desc);
+
+ (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
+
+ return_ACPI_STATUS(AE_OK);
+}
+
+ACPI_EXPORT_SYMBOL(acpi_unload_table_id)
+
+#ifdef ACPI_FUTURE_USAGE
+/*******************************************************************************
+ *
* FUNCTION: acpi_unload_table
*
* PARAMETERS: table_type - Type of table to be unloaded
Index: linux-2.6/include/acpi/acpixf.h
===================================================================
--- linux-2.6.orig/include/acpi/acpixf.h 2006-11-15 08:18:33.708526941 -0600
+++ linux-2.6/include/acpi/acpixf.h 2006-11-15 08:33:26.197854296 -0600
@@ -97,11 +97,12 @@ acpi_find_root_pointer(u32 flags, struct
acpi_status acpi_load_tables(void);
-#ifdef ACPI_FUTURE_USAGE
acpi_status acpi_load_table(struct acpi_table_header *table_ptr);
-acpi_status acpi_unload_table(acpi_table_type table_type);
+acpi_status acpi_unload_table_id(acpi_table_type table_type, acpi_owner_id id);
+#ifdef ACPI_FUTURE_USAGE
+acpi_status acpi_unload_table(acpi_table_type table_type);
acpi_status
acpi_get_table_header(acpi_table_type table_type,
u32 instance, struct acpi_table_header *out_table_header);