1 files changed, 389 insertions, 0 deletions

diff --git a/drivers/acpi/acpica/tbxfload.c b/drivers/acpi/acpica/tbxfload.c
new file mode 100644
index 000000000000..f87cc63e69a1
--- /dev/null
+++ b/drivers/acpi/acpica/tbxfload.c
@@ -0,0 +1,389 @@
+/******************************************************************************
+ *
+ * Module Name: tbxfload - Table load/unload external interfaces
+ *
+ *****************************************************************************/
+
+/*
+ * Copyright (C) 2000 - 2012, 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 <linux/export.h>
+#include <acpi/acpi.h>
+#include "accommon.h"
+#include "acnamesp.h"
+#include "actables.h"
+
+#define _COMPONENT          ACPI_TABLES
+ACPI_MODULE_NAME("tbxfload")
+
+/* Local prototypes */
+static acpi_status acpi_tb_load_namespace(void);
+
+static int no_auto_ssdt;
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_load_tables
+ *
+ * PARAMETERS:  None
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Load the ACPI tables from the RSDT/XSDT
+ *
+ ******************************************************************************/
+
+acpi_status acpi_load_tables(void)
+{
+        acpi_status status;
+
+        ACPI_FUNCTION_TRACE(acpi_load_tables);
+
+        /* Load the namespace from the tables */
+
+        status = acpi_tb_load_namespace();
+        if (ACPI_FAILURE(status)) {
+                ACPI_EXCEPTION((AE_INFO, status,
+                                "While loading namespace from ACPI tables"));
+        }
+
+        return_ACPI_STATUS(status);
+}
+
+ACPI_EXPORT_SYMBOL(acpi_load_tables)
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_tb_load_namespace
+ *
+ * PARAMETERS:  None
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Load the namespace from the DSDT and all SSDTs/PSDTs found in
+ *              the RSDT/XSDT.
+ *
+ ******************************************************************************/
+static acpi_status acpi_tb_load_namespace(void)
+{
+        acpi_status status;
+        u32 i;
+        struct acpi_table_header *new_dsdt;
+
+        ACPI_FUNCTION_TRACE(tb_load_namespace);
+
+        (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
+
+        /*
+         * Load the namespace. The DSDT is required, but any SSDT and
+         * PSDT tables are optional. Verify the DSDT.
+         */
+        if (!acpi_gbl_root_table_list.current_table_count ||
+            !ACPI_COMPARE_NAME(&
+                               (acpi_gbl_root_table_list.
+                                tables[ACPI_TABLE_INDEX_DSDT].signature),
+                               ACPI_SIG_DSDT)
+            ||
+            ACPI_FAILURE(acpi_tb_verify_table
+                         (&acpi_gbl_root_table_list.
+                          tables[ACPI_TABLE_INDEX_DSDT]))) {
+                status = AE_NO_ACPI_TABLES;
+                goto unlock_and_exit;
+        }
+
+        /*
+         * Save the DSDT pointer for simple access. This is the mapped memory
+         * address. We must take care here because the address of the .Tables
+         * array can change dynamically as tables are loaded at run-time. Note:
+         * .Pointer field is not validated until after call to acpi_tb_verify_table.
+         */
+        acpi_gbl_DSDT =
+            acpi_gbl_root_table_list.tables[ACPI_TABLE_INDEX_DSDT].pointer;
+
+        /*
+         * Optionally copy the entire DSDT to local memory (instead of simply
+         * mapping it.) There are some BIOSs that corrupt or replace the original
+         * DSDT, creating the need for this option. Default is FALSE, do not copy
+         * the DSDT.
+         */
+        if (acpi_gbl_copy_dsdt_locally) {
+                new_dsdt = acpi_tb_copy_dsdt(ACPI_TABLE_INDEX_DSDT);
+                if (new_dsdt) {
+                        acpi_gbl_DSDT = new_dsdt;
+                }
+        }
+
+        /*
+         * Save the original DSDT header for detection of table corruption
+         * and/or replacement of the DSDT from outside the OS.
+         */
+        ACPI_MEMCPY(&acpi_gbl_original_dsdt_header, acpi_gbl_DSDT,
+                    sizeof(struct acpi_table_header));
+
+        (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
+
+        /* Load and parse tables */
+
+        status = acpi_ns_load_table(ACPI_TABLE_INDEX_DSDT, acpi_gbl_root_node);
+        if (ACPI_FAILURE(status)) {
+                return_ACPI_STATUS(status);
+        }
+
+        /* Load any SSDT or PSDT tables. Note: Loop leaves tables locked */
+
+        (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
+        for (i = 0; i < acpi_gbl_root_table_list.current_table_count; ++i) {
+                if ((!ACPI_COMPARE_NAME
+                     (&(acpi_gbl_root_table_list.tables[i].signature),
+                      ACPI_SIG_SSDT)
+                     &&
+                     !ACPI_COMPARE_NAME(&
+                                        (acpi_gbl_root_table_list.tables[i].
+                                         signature), ACPI_SIG_PSDT))
+                    ||
+                    ACPI_FAILURE(acpi_tb_verify_table
+                                 (&acpi_gbl_root_table_list.tables[i]))) {
+                        continue;
+                }
+
+                if (no_auto_ssdt) {
+                        printk(KERN_WARNING "ACPI: SSDT ignored due to \"acpi_no_auto_ssdt\"\n");
+                        continue;
+                }
+
+                /* Ignore errors while loading tables, get as many as possible */
+
+                (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
+                (void)acpi_ns_load_table(i, acpi_gbl_root_node);
+                (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
+        }
+
+        ACPI_DEBUG_PRINT((ACPI_DB_INIT, "ACPI Tables successfully acquired\n"));
+
+      unlock_and_exit:
+        (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
+        return_ACPI_STATUS(status);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_load_table
+ *
+ * PARAMETERS:  table               - Pointer to a buffer containing the ACPI
+ *                                    table to be loaded.
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Dynamically load an ACPI table from the caller's buffer. Must
+ *              be a valid ACPI table with a valid ACPI table header.
+ *              Note1: Mainly intended to support hotplug addition of SSDTs.
+ *              Note2: Does not copy the incoming table. User is reponsible
+ *              to ensure that the table is not deleted or unmapped.
+ *
+ ******************************************************************************/
+
+acpi_status acpi_load_table(struct acpi_table_header *table)
+{
+        acpi_status status;
+        struct acpi_table_desc table_desc;
+        u32 table_index;
+
+        ACPI_FUNCTION_TRACE(acpi_load_table);
+
+        /* Parameter validation */
+
+        if (!table) {
+                return_ACPI_STATUS(AE_BAD_PARAMETER);
+        }
+
+        /* Init local table descriptor */
+
+        ACPI_MEMSET(&table_desc, 0, sizeof(struct acpi_table_desc));
+        table_desc.address = ACPI_PTR_TO_PHYSADDR(table);
+        table_desc.pointer = table;
+        table_desc.length = table->length;
+        table_desc.flags = ACPI_TABLE_ORIGIN_UNKNOWN;
+
+        /* Must acquire the interpreter lock during this operation */
+
+        status = acpi_ut_acquire_mutex(ACPI_MTX_INTERPRETER);
+        if (ACPI_FAILURE(status)) {
+                return_ACPI_STATUS(status);
+        }
+
+        /* Install the table and load it into the namespace */
+
+        ACPI_INFO((AE_INFO, "Host-directed Dynamic ACPI Table Load:"));
+        status = acpi_tb_add_table(&table_desc, &table_index);
+        if (ACPI_FAILURE(status)) {
+                goto unlock_and_exit;
+        }
+
+        status = acpi_ns_load_table(table_index, acpi_gbl_root_node);
+
+        /* Invoke table handler if present */
+
+        if (acpi_gbl_table_handler) {
+                (void)acpi_gbl_table_handler(ACPI_TABLE_EVENT_LOAD, table,
+                                             acpi_gbl_table_handler_context);
+        }
+
+      unlock_and_exit:
+        (void)acpi_ut_release_mutex(ACPI_MTX_INTERPRETER);
+        return_ACPI_STATUS(status);
+}
+
+ACPI_EXPORT_SYMBOL(acpi_load_table)
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_unload_parent_table
+ *
+ * PARAMETERS:  object              - Handle to any namespace object owned by
+ *                                    the table to be unloaded
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Via any namespace object within an SSDT or OEMx table, unloads
+ *              the table and deletes all namespace objects associated with
+ *              that table. Unloading of the DSDT is not allowed.
+ *              Note: Mainly intended to support hotplug removal of SSDTs.
+ *
+ ******************************************************************************/
+acpi_status acpi_unload_parent_table(acpi_handle object)
+{
+        struct acpi_namespace_node *node =
+            ACPI_CAST_PTR(struct acpi_namespace_node, object);
+        acpi_status status = AE_NOT_EXIST;
+        acpi_owner_id owner_id;
+        u32 i;
+
+        ACPI_FUNCTION_TRACE(acpi_unload_parent_table);
+
+        /* Parameter validation */
+
+        if (!object) {
+                return_ACPI_STATUS(AE_BAD_PARAMETER);
+        }
+
+        /*
+         * The node owner_id is currently the same as the parent table ID.
+         * However, this could change in the future.
+         */
+        owner_id = node->owner_id;
+        if (!owner_id) {
+
+                /* owner_id==0 means DSDT is the owner. DSDT cannot be unloaded */
+
+                return_ACPI_STATUS(AE_TYPE);
+        }
+
+        /* Must acquire the interpreter lock during this operation */
+
+        status = acpi_ut_acquire_mutex(ACPI_MTX_INTERPRETER);
+        if (ACPI_FAILURE(status)) {
+                return_ACPI_STATUS(status);
+        }
+
+        /* Find the table in the global table list */
+
+        for (i = 0; i < acpi_gbl_root_table_list.current_table_count; i++) {
+                if (owner_id != acpi_gbl_root_table_list.tables[i].owner_id) {
+                        continue;
+                }
+
+                /*
+                 * Allow unload of SSDT and OEMx tables only. Do not allow unload
+                 * of the DSDT. No other types of tables should get here, since
+                 * only these types can contain AML and thus are the only types
+                 * that can create namespace objects.
+                 */
+                if (ACPI_COMPARE_NAME
+                    (acpi_gbl_root_table_list.tables[i].signature.ascii,
+                     ACPI_SIG_DSDT)) {
+                        status = AE_TYPE;
+                        break;
+                }
+
+                /* Ensure the table is actually loaded */
+
+                if (!acpi_tb_is_table_loaded(i)) {
+                        status = AE_NOT_EXIST;
+                        break;
+                }
+
+                /* Invoke table handler if present */
+
+                if (acpi_gbl_table_handler) {
+                        (void)acpi_gbl_table_handler(ACPI_TABLE_EVENT_UNLOAD,
+                                                     acpi_gbl_root_table_list.
+                                                     tables[i].pointer,
+                                                     acpi_gbl_table_handler_context);
+                }
+
+                /*
+                 * 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.
+                 */
+                status = acpi_tb_delete_namespace_by_owner(i);
+                if (ACPI_FAILURE(status)) {
+                        break;
+                }
+
+                status = acpi_tb_release_owner_id(i);
+                acpi_tb_set_table_loaded_flag(i, FALSE);
+                break;
+        }
+
+        (void)acpi_ut_release_mutex(ACPI_MTX_INTERPRETER);
+        return_ACPI_STATUS(status);
+}
+
+ACPI_EXPORT_SYMBOL(acpi_unload_parent_table)
+
+static int __init acpi_no_auto_ssdt_setup(char *s) {
+
+        printk(KERN_NOTICE "ACPI: SSDT auto-load disabled\n");
+
+        no_auto_ssdt = 1;
+
+        return 1;
+}
+
+__setup("acpi_no_auto_ssdt", acpi_no_auto_ssdt_setup);