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. Signed-off-by: Aaron Young <ayoung@xxxxxxx> --- Andrew, Can you take this update and replace the current version in your -mm tree: add-support-for-acpi_load_table-acpi_unload_table_id.patch Len, What do we need to do to resolve any licensing issues related to these changes? Thanks. Resend #2 Code has been improved to no longer use ACPI "internal" routines (such as acpi_ns_get_next_node()). To this end, a new public interface to obtain the owner_id for a handle was added (acpi_get_id()). It is very similar to existing routine acpi_get_type(). Resend #1 Original send of this patch was outdated and did not have acpi_ut_acquire_mutex() and acpi_ut_release_mutex() calls in acpi_unload_table_id().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/nsxfobj.c | 44 +++++++++++++++++++++++ drivers/acpi/tables/tbxface.c | 54 ++++++++++++++++++++++++++++- include/acpi/acpixf.h | 7 ++- 3 files changed, 102 insertions(+), 3 deletions(-) Index: release/drivers/acpi/tables/tbxface.c =================================================================== --- release.orig/drivers/acpi/tables/tbxface.c 2006-11-29 14:14:23.532910707 -0600 +++ release/drivers/acpi/tables/tbxface.c 2006-11-29 14:15:04.173937975 -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: release/include/acpi/acpixf.h =================================================================== --- release.orig/include/acpi/acpixf.h 2006-11-29 14:14:23.556913676 -0600 +++ release/include/acpi/acpixf.h 2006-11-29 14:18:55.966606388 -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); @@ -180,6 +181,8 @@ acpi_get_next_object(acpi_object_type ty acpi_status acpi_get_type(acpi_handle object, acpi_object_type * out_type); +acpi_status acpi_get_id(acpi_handle object, acpi_owner_id * out_type); + acpi_status acpi_get_parent(acpi_handle object, acpi_handle * out_handle); /* Index: release/drivers/acpi/namespace/nsxfobj.c =================================================================== --- release.orig/drivers/acpi/namespace/nsxfobj.c 2006-11-29 14:18:31.000000000 -0600 +++ release/drivers/acpi/namespace/nsxfobj.c 2006-11-29 14:19:18.709418875 -0600 @@ -50,6 +50,50 @@ ACPI_MODULE_NAME("nsxfobj") /******************************************************************************* * + * FUNCTION: acpi_get_id + * + * PARAMETERS: Handle - Handle of object whose id is desired + * ret_id - Where the id will be placed + * + * RETURN: Status + * + * DESCRIPTION: This routine returns the owner id associated with a handle + * + ******************************************************************************/ +acpi_status acpi_get_id(acpi_handle handle, acpi_owner_id * ret_id) +{ + struct acpi_namespace_node *node; + acpi_status status; + + /* Parameter Validation */ + + if (!ret_id) { + return (AE_BAD_PARAMETER); + } + + status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); + if (ACPI_FAILURE(status)) { + return (status); + } + + /* Convert and validate the handle */ + + node = acpi_ns_map_handle_to_node(handle); + if (!node) { + (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); + return (AE_BAD_PARAMETER); + } + + *ret_id = node->owner_id; + + status = acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); + return (status); +} + +ACPI_EXPORT_SYMBOL(acpi_get_id) + +/******************************************************************************* + * * FUNCTION: acpi_get_type * * PARAMETERS: Handle - Handle of object whose type is desired - To unsubscribe from this list: send the line "unsubscribe linux-ia64" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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