ACPICA/ACPI: Add new host interfaces for _OSI support

Adds install/remove interfaces so that the host can dynamically
alter the global _OSI table. Also adds support for _OSI handlers.
Additional support: new debugger command (osi), and test support in
the acpiexec utility. Adds new file, utilities/utosi.c.
ACPICA bugzilla 836.

The Linux OSL _OSI code is also changed.
acpi_osi_setup can't call acpi_install/remove_interface because ACPICA
is not initialized yet at this early time.
So we just save the osi string in acpi_osi_setup and will handle it
later in a new function acpi_osi_setup_late.

http://www.acpica.org/bugzilla/show_bug.cgi?id=836

Signed-off-by: Lin Ming <ming.m.lin@intel.com>
Signed-off-by: Bob Moore <robert.moore@intel.com
Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 379 insertions, 0 deletions

diff --git a/drivers/acpi/acpica/utosi.c b/drivers/acpi/acpica/utosi.c
new file mode 100644
index 00000000000..0a37950c96a
--- /dev/null
+++ b/drivers/acpi/acpica/utosi.c
@@ -0,0 +1,379 @@
+/******************************************************************************
+ *
+ * Module Name: utosi - Support for the _OSI predefined control method
+ *
+ *****************************************************************************/
+
+/*
+ * Copyright (C) 2000 - 2010, Intel Corp.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions, and the following disclaimer,
+ *    without modification.
+ * 2. Redistributions in binary form must reproduce at minimum a disclaimer
+ *    substantially similar to the "NO WARRANTY" disclaimer below
+ *    ("Disclaimer") and any redistribution must be conditioned upon
+ *    including a substantially similar Disclaimer requirement for further
+ *    binary redistribution.
+ * 3. Neither the names of the above-listed copyright holders nor the names
+ *    of any contributors may be used to endorse or promote products derived
+ *    from this software without specific prior written permission.
+ *
+ * Alternatively, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") version 2 as published by the Free
+ * Software Foundation.
+ *
+ * NO WARRANTY
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGES.
+ */
+
+#include <acpi/acpi.h>
+#include "accommon.h"
+
+#define _COMPONENT          ACPI_UTILITIES
+ACPI_MODULE_NAME("utosi")
+
+/*
+ * Strings supported by the _OSI predefined control method (which is
+ * implemented internally within this module.)
+ *
+ * March 2009: Removed "Linux" as this host no longer wants to respond true
+ * for this string. Basically, the only safe OS strings are windows-related
+ * and in many or most cases represent the only test path within the
+ * BIOS-provided ASL code.
+ *
+ * The last element of each entry is used to track the newest version of
+ * Windows that the BIOS has requested.
+ */
+static struct acpi_interface_info acpi_default_supported_interfaces[] = {
+        /* Operating System Vendor Strings */
+
+        {"Windows 2000", NULL, 0, ACPI_OSI_WIN_2000},   /* Windows 2000 */
+        {"Windows 2001", NULL, 0, ACPI_OSI_WIN_XP},     /* Windows XP */
+        {"Windows 2001 SP1", NULL, 0, ACPI_OSI_WIN_XP_SP1},     /* Windows XP SP1 */
+        {"Windows 2001.1", NULL, 0, ACPI_OSI_WINSRV_2003},      /* Windows Server 2003 */
+        {"Windows 2001 SP2", NULL, 0, ACPI_OSI_WIN_XP_SP2},     /* Windows XP SP2 */
+        {"Windows 2001.1 SP1", NULL, 0, ACPI_OSI_WINSRV_2003_SP1},      /* Windows Server 2003 SP1 - Added 03/2006 */
+        {"Windows 2006", NULL, 0, ACPI_OSI_WIN_VISTA},  /* Windows Vista - Added 03/2006 */
+        {"Windows 2006.1", NULL, 0, ACPI_OSI_WINSRV_2008},      /* Windows Server 2008 - Added 09/2009 */
+        {"Windows 2006 SP1", NULL, 0, ACPI_OSI_WIN_VISTA_SP1},  /* Windows Vista SP1 - Added 09/2009 */
+        {"Windows 2009", NULL, 0, ACPI_OSI_WIN_7},      /* Windows 7 and Server 2008 R2 - Added 09/2009 */
+
+        /* Feature Group Strings */
+
+        {"Extended Address Space Descriptor", NULL, 0, 0}
+
+        /*
+         * All "optional" feature group strings (features that are implemented
+         * by the host) should be dynamically added by the host via
+         * acpi_install_interface and should not be manually added here.
+         *
+         * Examples of optional feature group strings:
+         *
+         * "Module Device"
+         * "Processor Device"
+         * "3.0 Thermal Model"
+         * "3.0 _SCP Extensions"
+         * "Processor Aggregator Device"
+         */
+};
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ut_initialize_interfaces
+ *
+ * PARAMETERS:  None
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Initialize the global _OSI supported interfaces list
+ *
+ ******************************************************************************/
+
+acpi_status acpi_ut_initialize_interfaces(void)
+{
+        u32 i;
+
+        (void)acpi_os_acquire_mutex(acpi_gbl_osi_mutex, ACPI_WAIT_FOREVER);
+        acpi_gbl_supported_interfaces = acpi_default_supported_interfaces;
+
+        /* Link the static list of supported interfaces */
+
+        for (i = 0;
+             i < (ACPI_ARRAY_LENGTH(acpi_default_supported_interfaces) - 1);
+             i++) {
+                acpi_default_supported_interfaces[i].next =
+                    &acpi_default_supported_interfaces[(acpi_size) i + 1];
+        }
+
+        acpi_os_release_mutex(acpi_gbl_osi_mutex);
+        return (AE_OK);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ut_interface_terminate
+ *
+ * PARAMETERS:  None
+ *
+ * RETURN:      None
+ *
+ * DESCRIPTION: Delete all interfaces in the global list. Sets
+ *              acpi_gbl_supported_interfaces to NULL.
+ *
+ ******************************************************************************/
+
+void acpi_ut_interface_terminate(void)
+{
+        struct acpi_interface_info *next_interface;
+
+        (void)acpi_os_acquire_mutex(acpi_gbl_osi_mutex, ACPI_WAIT_FOREVER);
+        next_interface = acpi_gbl_supported_interfaces;
+
+        while (next_interface) {
+                acpi_gbl_supported_interfaces = next_interface->next;
+
+                /* Only interfaces added at runtime can be freed */
+
+                if (next_interface->flags & ACPI_OSI_DYNAMIC) {
+                        ACPI_FREE(next_interface->name);
+                        ACPI_FREE(next_interface);
+                }
+
+                next_interface = acpi_gbl_supported_interfaces;
+        }
+
+        acpi_os_release_mutex(acpi_gbl_osi_mutex);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ut_install_interface
+ *
+ * PARAMETERS:  interface_name      - The interface to install
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Install the interface into the global interface list.
+ *              Caller MUST hold acpi_gbl_osi_mutex
+ *
+ ******************************************************************************/
+
+acpi_status acpi_ut_install_interface(acpi_string interface_name)
+{
+        struct acpi_interface_info *interface_info;
+
+        /* Allocate info block and space for the name string */
+
+        interface_info =
+            ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_interface_info));
+        if (!interface_info) {
+                return (AE_NO_MEMORY);
+        }
+
+        interface_info->name =
+            ACPI_ALLOCATE_ZEROED(ACPI_STRLEN(interface_name) + 1);
+        if (!interface_info->name) {
+                ACPI_FREE(interface_info);
+                return (AE_NO_MEMORY);
+        }
+
+        /* Initialize new info and insert at the head of the global list */
+
+        ACPI_STRCPY(interface_info->name, interface_name);
+        interface_info->flags = ACPI_OSI_DYNAMIC;
+        interface_info->next = acpi_gbl_supported_interfaces;
+
+        acpi_gbl_supported_interfaces = interface_info;
+        return (AE_OK);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ut_remove_interface
+ *
+ * PARAMETERS:  interface_name      - The interface to remove
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Remove the interface from the global interface list.
+ *              Caller MUST hold acpi_gbl_osi_mutex
+ *
+ ******************************************************************************/
+
+acpi_status acpi_ut_remove_interface(acpi_string interface_name)
+{
+        struct acpi_interface_info *previous_interface;
+        struct acpi_interface_info *next_interface;
+
+        previous_interface = next_interface = acpi_gbl_supported_interfaces;
+        while (next_interface) {
+                if (!ACPI_STRCMP(interface_name, next_interface->name)) {
+
+                        /* Found: name is in either the static list or was added at runtime */
+
+                        if (next_interface->flags & ACPI_OSI_DYNAMIC) {
+
+                                /* Interface was added dynamically, remove and free it */
+
+                                if (previous_interface == next_interface) {
+                                        acpi_gbl_supported_interfaces =
+                                            next_interface->next;
+                                } else {
+                                        previous_interface->next =
+                                            next_interface->next;
+                                }
+
+                                ACPI_FREE(next_interface->name);
+                                ACPI_FREE(next_interface);
+                        } else {
+                                /*
+                                 * Interface is in static list. If marked invalid, then it
+                                 * does not actually exist. Else, mark it invalid.
+                                 */
+                                if (next_interface->flags & ACPI_OSI_INVALID) {
+                                        return (AE_NOT_EXIST);
+                                }
+
+                                next_interface->flags |= ACPI_OSI_INVALID;
+                        }
+
+                        return (AE_OK);
+                }
+
+                previous_interface = next_interface;
+                next_interface = next_interface->next;
+        }
+
+        /* Interface was not found */
+
+        return (AE_NOT_EXIST);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ut_get_interface
+ *
+ * PARAMETERS:  interface_name      - The interface to find
+ *
+ * RETURN:      struct acpi_interface_info if found. NULL if not found.
+ *
+ * DESCRIPTION: Search for the specified interface name in the global list.
+ *              Caller MUST hold acpi_gbl_osi_mutex
+ *
+ ******************************************************************************/
+
+struct acpi_interface_info *acpi_ut_get_interface(acpi_string interface_name)
+{
+        struct acpi_interface_info *next_interface;
+
+        next_interface = acpi_gbl_supported_interfaces;
+        while (next_interface) {
+                if (!ACPI_STRCMP(interface_name, next_interface->name)) {
+                        return (next_interface);
+                }
+
+                next_interface = next_interface->next;
+        }
+
+        return (NULL);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ut_osi_implementation
+ *
+ * PARAMETERS:  walk_state          - Current walk state
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Implementation of the _OSI predefined control method. When
+ *              an invocation of _OSI is encountered in the system AML,
+ *              control is transferred to this function.
+ *
+ ******************************************************************************/
+
+acpi_status acpi_ut_osi_implementation(struct acpi_walk_state * walk_state)
+{
+        union acpi_operand_object *string_desc;
+        union acpi_operand_object *return_desc;
+        struct acpi_interface_info *interface_info;
+        acpi_interface_handler interface_handler;
+        u32 return_value;
+
+        ACPI_FUNCTION_TRACE(ut_osi_implementation);
+
+        /* Validate the string input argument (from the AML caller) */
+
+        string_desc = walk_state->arguments[0].object;
+        if (!string_desc || (string_desc->common.type != ACPI_TYPE_STRING)) {
+                return_ACPI_STATUS(AE_TYPE);
+        }
+
+        /* Create a return object */
+
+        return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
+        if (!return_desc) {
+                return_ACPI_STATUS(AE_NO_MEMORY);
+        }
+
+        /* Default return value is 0, NOT SUPPORTED */
+
+        return_value = 0;
+        (void)acpi_os_acquire_mutex(acpi_gbl_osi_mutex, ACPI_WAIT_FOREVER);
+
+        /* Lookup the interface in the global _OSI list */
+
+        interface_info = acpi_ut_get_interface(string_desc->string.pointer);
+        if (interface_info && !(interface_info->flags & ACPI_OSI_INVALID)) {
+                /*
+                 * The interface is supported.
+                 * Update the osi_data if necessary. We keep track of the latest
+                 * version of Windows that has been requested by the BIOS.
+                 */
+                if (interface_info->value > acpi_gbl_osi_data) {
+                        acpi_gbl_osi_data = interface_info->value;
+                }
+
+                return_value = ACPI_UINT32_MAX;
+        }
+
+        acpi_os_release_mutex(acpi_gbl_osi_mutex);
+
+        /*
+         * Invoke an optional _OSI interface handler. The host OS may wish
+         * to do some interface-specific handling. For example, warn about
+         * certain interfaces or override the true/false support value.
+         */
+        interface_handler = acpi_gbl_interface_handler;
+        if (interface_handler) {
+                return_value =
+                    interface_handler(string_desc->string.pointer,
+                                      return_value);
+        }
+
+        ACPI_DEBUG_PRINT_RAW((ACPI_DB_INFO,
+                              "ACPI: BIOS _OSI(\"%s\") is %ssupported\n",
+                              string_desc->string.pointer,
+                              return_value == 0 ? "not " : ""));
+
+        /* Complete the return object */
+
+        return_desc->integer.value = return_value;
+        walk_state->return_desc = return_desc;
+        return_ACPI_STATUS(AE_OK);
+}