Re: [PATCH 3/3] - Add support for acpi_load_table/acpi_unload_table_id

[Len Brown <len.brown@intel.com>]

On Wednesday 15 November 2006 10:27, John Keller wrote:
>  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 <ayoung@sgi.com>
> 
> ---
> 
>  drivers/acpi/namespace/nsutils.c |    4 ++
>  drivers/acpi/namespace/nswalk.c  |    2 +
>  drivers/acpi/tables/tbxface.c    |   47 ++++++++++++++++++++++++++++-
>  include/acpi/acpixf.h            |    5 +--
>  4 files changed, 55 insertions(+), 3 deletions(-)

John, Aaron,
acpi/namespace/* files come to Linux from ACPICA.
It is much easier for everybody if ACPICA changes make it in  "upstream"
so that Linux doesn't diverge from the reference implementation.

If you grant Intel the license to distribute (a derivation) of your changes
under BOTH the GPL and BSD licenses appearing at the top of these files,
then we can do that.  Basically what this means is that other operating
systems besides Linux will benefit from your changes too --
some of them are open source (eg. FreeBSD) and some are not (eg. HPUX).

Please let me know.

thanks,
-Len

> 
> Index: linux-2.6/drivers/acpi/namespace/nsutils.c
> ===================================================================
> --- linux-2.6.orig/drivers/acpi/namespace/nsutils.c	2006-10-23 08:48:15.836279420 -0500
> +++ linux-2.6/drivers/acpi/namespace/nsutils.c	2006-10-23 09:17:33.930473274 -0500
> @@ -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	2006-10-23 08:48:15.836279420 -0500
> +++ linux-2.6/drivers/acpi/namespace/nswalk.c	2006-10-23 09:17:33.930473274 -0500
> @@ -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	2006-10-23 08:48:15.856281906 -0500
> +++ linux-2.6/drivers/acpi/tables/tbxface.c	2006-10-23 09:17:33.934473770 -0500
> @@ -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 +220,52 @@ 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_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);
> +
> +	(void)acpi_tb_uninstall_table(table_desc);
> +
> +	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	2006-10-23 08:48:18.364593597 -0500
> +++ linux-2.6/include/acpi/acpixf.h	2006-10-23 09:17:33.934473770 -0500
> @@ -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);
> -
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