Merge commit 'v2.6.29-rc1' into irq/urgent

1 files changed, 676 insertions, 0 deletions

diff --git a/drivers/acpi/acpica/nsaccess.c b/drivers/acpi/acpica/nsaccess.c
new file mode 100644
index 000000000000..88303ebe924c
--- /dev/null
+++ b/drivers/acpi/acpica/nsaccess.c
@@ -0,0 +1,676 @@
+/*******************************************************************************
+ *
+ * Module Name: nsaccess - Top-level functions for accessing ACPI namespace
+ *
+ ******************************************************************************/
+
+/*
+ * Copyright (C) 2000 - 2008, 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"
+#include "amlcode.h"
+#include "acnamesp.h"
+#include "acdispat.h"
+
+#define _COMPONENT          ACPI_NAMESPACE
+ACPI_MODULE_NAME("nsaccess")
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ns_root_initialize
+ *
+ * PARAMETERS:  None
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Allocate and initialize the default root named objects
+ *
+ * MUTEX:       Locks namespace for entire execution
+ *
+ ******************************************************************************/
+acpi_status acpi_ns_root_initialize(void)
+{
+        acpi_status status;
+        const struct acpi_predefined_names *init_val = NULL;
+        struct acpi_namespace_node *new_node;
+        union acpi_operand_object *obj_desc;
+        acpi_string val = NULL;
+
+        ACPI_FUNCTION_TRACE(ns_root_initialize);
+
+        status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
+        if (ACPI_FAILURE(status)) {
+                return_ACPI_STATUS(status);
+        }
+
+        /*
+         * The global root ptr is initially NULL, so a non-NULL value indicates
+         * that acpi_ns_root_initialize() has already been called; just return.
+         */
+        if (acpi_gbl_root_node) {
+                status = AE_OK;
+                goto unlock_and_exit;
+        }
+
+        /*
+         * Tell the rest of the subsystem that the root is initialized
+         * (This is OK because the namespace is locked)
+         */
+        acpi_gbl_root_node = &acpi_gbl_root_node_struct;
+
+        /* Enter the pre-defined names in the name table */
+
+        ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+                          "Entering predefined entries into namespace\n"));
+
+        for (init_val = acpi_gbl_pre_defined_names; init_val->name; init_val++) {
+
+                /* _OSI is optional for now, will be permanent later */
+
+                if (!ACPI_STRCMP(init_val->name, "_OSI")
+                    && !acpi_gbl_create_osi_method) {
+                        continue;
+                }
+
+                status = acpi_ns_lookup(NULL, init_val->name, init_val->type,
+                                        ACPI_IMODE_LOAD_PASS2,
+                                        ACPI_NS_NO_UPSEARCH, NULL, &new_node);
+
+                if (ACPI_FAILURE(status) || (!new_node)) {      /* Must be on same line for code converter */
+                        ACPI_EXCEPTION((AE_INFO, status,
+                                        "Could not create predefined name %s",
+                                        init_val->name));
+                }
+
+                /*
+                 * Name entered successfully.
+                 * If entry in pre_defined_names[] specifies an
+                 * initial value, create the initial value.
+                 */
+                if (init_val->val) {
+                        status = acpi_os_predefined_override(init_val, &val);
+                        if (ACPI_FAILURE(status)) {
+                                ACPI_ERROR((AE_INFO,
+                                            "Could not override predefined %s",
+                                            init_val->name));
+                        }
+
+                        if (!val) {
+                                val = init_val->val;
+                        }
+
+                        /*
+                         * Entry requests an initial value, allocate a
+                         * descriptor for it.
+                         */
+                        obj_desc =
+                            acpi_ut_create_internal_object(init_val->type);
+                        if (!obj_desc) {
+                                status = AE_NO_MEMORY;
+                                goto unlock_and_exit;
+                        }
+
+                        /*
+                         * Convert value string from table entry to
+                         * internal representation. Only types actually
+                         * used for initial values are implemented here.
+                         */
+                        switch (init_val->type) {
+                        case ACPI_TYPE_METHOD:
+                                obj_desc->method.param_count =
+                                    (u8) ACPI_TO_INTEGER(val);
+                                obj_desc->common.flags |= AOPOBJ_DATA_VALID;
+
+#if defined (ACPI_ASL_COMPILER)
+
+                                /* Save the parameter count for the i_aSL compiler */
+
+                                new_node->value = obj_desc->method.param_count;
+#else
+                                /* Mark this as a very SPECIAL method */
+
+                                obj_desc->method.method_flags =
+                                    AML_METHOD_INTERNAL_ONLY;
+                                obj_desc->method.implementation =
+                                    acpi_ut_osi_implementation;
+#endif
+                                break;
+
+                        case ACPI_TYPE_INTEGER:
+
+                                obj_desc->integer.value = ACPI_TO_INTEGER(val);
+                                break;
+
+                        case ACPI_TYPE_STRING:
+
+                                /*
+                                 * Build an object around the static string
+                                 */
+                                obj_desc->string.length =
+                                    (u32) ACPI_STRLEN(val);
+                                obj_desc->string.pointer = val;
+                                obj_desc->common.flags |= AOPOBJ_STATIC_POINTER;
+                                break;
+
+                        case ACPI_TYPE_MUTEX:
+
+                                obj_desc->mutex.node = new_node;
+                                obj_desc->mutex.sync_level =
+                                    (u8) (ACPI_TO_INTEGER(val) - 1);
+
+                                /* Create a mutex */
+
+                                status =
+                                    acpi_os_create_mutex(&obj_desc->mutex.
+                                                         os_mutex);
+                                if (ACPI_FAILURE(status)) {
+                                        acpi_ut_remove_reference(obj_desc);
+                                        goto unlock_and_exit;
+                                }
+
+                                /* Special case for ACPI Global Lock */
+
+                                if (ACPI_STRCMP(init_val->name, "_GL_") == 0) {
+                                        acpi_gbl_global_lock_mutex = obj_desc;
+
+                                        /* Create additional counting semaphore for global lock */
+
+                                        status =
+                                            acpi_os_create_semaphore(1, 0,
+                                                                     &acpi_gbl_global_lock_semaphore);
+                                        if (ACPI_FAILURE(status)) {
+                                                acpi_ut_remove_reference
+                                                    (obj_desc);
+                                                goto unlock_and_exit;
+                                        }
+                                }
+                                break;
+
+                        default:
+
+                                ACPI_ERROR((AE_INFO,
+                                            "Unsupported initial type value %X",
+                                            init_val->type));
+                                acpi_ut_remove_reference(obj_desc);
+                                obj_desc = NULL;
+                                continue;
+                        }
+
+                        /* Store pointer to value descriptor in the Node */
+
+                        status = acpi_ns_attach_object(new_node, obj_desc,
+                                                       ACPI_GET_OBJECT_TYPE
+                                                       (obj_desc));
+
+                        /* Remove local reference to the object */
+
+                        acpi_ut_remove_reference(obj_desc);
+                }
+        }
+
+      unlock_and_exit:
+        (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
+
+        /* Save a handle to "_GPE", it is always present */
+
+        if (ACPI_SUCCESS(status)) {
+                status = acpi_ns_get_node(NULL, "\\_GPE", ACPI_NS_NO_UPSEARCH,
+                                          &acpi_gbl_fadt_gpe_device);
+        }
+
+        return_ACPI_STATUS(status);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ns_lookup
+ *
+ * PARAMETERS:  scope_info      - Current scope info block
+ *              Pathname        - Search pathname, in internal format
+ *                                (as represented in the AML stream)
+ *              Type            - Type associated with name
+ *              interpreter_mode - IMODE_LOAD_PASS2 => add name if not found
+ *              Flags           - Flags describing the search restrictions
+ *              walk_state      - Current state of the walk
+ *              return_node     - Where the Node is placed (if found
+ *                                or created successfully)
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Find or enter the passed name in the name space.
+ *              Log an error if name not found in Exec mode.
+ *
+ * MUTEX:       Assumes namespace is locked.
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_ns_lookup(union acpi_generic_state *scope_info,
+               char *pathname,
+               acpi_object_type type,
+               acpi_interpreter_mode interpreter_mode,
+               u32 flags,
+               struct acpi_walk_state *walk_state,
+               struct acpi_namespace_node **return_node)
+{
+        acpi_status status;
+        char *path = pathname;
+        struct acpi_namespace_node *prefix_node;
+        struct acpi_namespace_node *current_node = NULL;
+        struct acpi_namespace_node *this_node = NULL;
+        u32 num_segments;
+        u32 num_carats;
+        acpi_name simple_name;
+        acpi_object_type type_to_check_for;
+        acpi_object_type this_search_type;
+        u32 search_parent_flag = ACPI_NS_SEARCH_PARENT;
+        u32 local_flags;
+
+        ACPI_FUNCTION_TRACE(ns_lookup);
+
+        if (!return_node) {
+                return_ACPI_STATUS(AE_BAD_PARAMETER);
+        }
+
+        local_flags = flags & ~(ACPI_NS_ERROR_IF_FOUND | ACPI_NS_SEARCH_PARENT);
+        *return_node = ACPI_ENTRY_NOT_FOUND;
+        acpi_gbl_ns_lookup_count++;
+
+        if (!acpi_gbl_root_node) {
+                return_ACPI_STATUS(AE_NO_NAMESPACE);
+        }
+
+        /*
+         * Get the prefix scope.
+         * A null scope means use the root scope
+         */
+        if ((!scope_info) || (!scope_info->scope.node)) {
+                ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
+                                  "Null scope prefix, using root node (%p)\n",
+                                  acpi_gbl_root_node));
+
+                prefix_node = acpi_gbl_root_node;
+        } else {
+                prefix_node = scope_info->scope.node;
+                if (ACPI_GET_DESCRIPTOR_TYPE(prefix_node) !=
+                    ACPI_DESC_TYPE_NAMED) {
+                        ACPI_ERROR((AE_INFO, "%p is not a namespace node [%s]",
+                                    prefix_node,
+                                    acpi_ut_get_descriptor_name(prefix_node)));
+                        return_ACPI_STATUS(AE_AML_INTERNAL);
+                }
+
+                if (!(flags & ACPI_NS_PREFIX_IS_SCOPE)) {
+                        /*
+                         * This node might not be a actual "scope" node (such as a
+                         * Device/Method, etc.)  It could be a Package or other object node.
+                         * Backup up the tree to find the containing scope node.
+                         */
+                        while (!acpi_ns_opens_scope(prefix_node->type) &&
+                               prefix_node->type != ACPI_TYPE_ANY) {
+                                prefix_node =
+                                    acpi_ns_get_parent_node(prefix_node);
+                        }
+                }
+        }
+
+        /* Save type   TBD: may be no longer necessary */
+
+        type_to_check_for = type;
+
+        /*
+         * Begin examination of the actual pathname
+         */
+        if (!pathname) {
+
+                /* A Null name_path is allowed and refers to the root */
+
+                num_segments = 0;
+                this_node = acpi_gbl_root_node;
+                path = "";
+
+                ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
+                                  "Null Pathname (Zero segments), Flags=%X\n",
+                                  flags));
+        } else {
+                /*
+                 * Name pointer is valid (and must be in internal name format)
+                 *
+                 * Check for scope prefixes:
+                 *
+                 * As represented in the AML stream, a namepath consists of an
+                 * optional scope prefix followed by a name segment part.
+                 *
+                 * If present, the scope prefix is either a Root Prefix (in
+                 * which case the name is fully qualified), or one or more
+                 * Parent Prefixes (in which case the name's scope is relative
+                 * to the current scope).
+                 */
+                if (*path == (u8) AML_ROOT_PREFIX) {
+
+                        /* Pathname is fully qualified, start from the root */
+
+                        this_node = acpi_gbl_root_node;
+                        search_parent_flag = ACPI_NS_NO_UPSEARCH;
+
+                        /* Point to name segment part */
+
+                        path++;
+
+                        ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
+                                          "Path is absolute from root [%p]\n",
+                                          this_node));
+                } else {
+                        /* Pathname is relative to current scope, start there */
+
+                        ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
+                                          "Searching relative to prefix scope [%4.4s] (%p)\n",
+                                          acpi_ut_get_node_name(prefix_node),
+                                          prefix_node));
+
+                        /*
+                         * Handle multiple Parent Prefixes (carat) by just getting
+                         * the parent node for each prefix instance.
+                         */
+                        this_node = prefix_node;
+                        num_carats = 0;
+                        while (*path == (u8) AML_PARENT_PREFIX) {
+
+                                /* Name is fully qualified, no search rules apply */
+
+                                search_parent_flag = ACPI_NS_NO_UPSEARCH;
+                                /*
+                                 * Point past this prefix to the name segment
+                                 * part or the next Parent Prefix
+                                 */
+                                path++;
+
+                                /* Backup to the parent node */
+
+                                num_carats++;
+                                this_node = acpi_ns_get_parent_node(this_node);
+                                if (!this_node) {
+
+                                        /* Current scope has no parent scope */
+
+                                        ACPI_ERROR((AE_INFO,
+                                                    "ACPI path has too many parent prefixes (^) - reached beyond root node"));
+                                        return_ACPI_STATUS(AE_NOT_FOUND);
+                                }
+                        }
+
+                        if (search_parent_flag == ACPI_NS_NO_UPSEARCH) {
+                                ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
+                                                  "Search scope is [%4.4s], path has %d carat(s)\n",
+                                                  acpi_ut_get_node_name
+                                                  (this_node), num_carats));
+                        }
+                }
+
+                /*
+                 * Determine the number of ACPI name segments in this pathname.
+                 *
+                 * The segment part consists of either:
+                 *  - A Null name segment (0)
+                 *  - A dual_name_prefix followed by two 4-byte name segments
+                 *  - A multi_name_prefix followed by a byte indicating the
+                 *      number of segments and the segments themselves.
+                 *  - A single 4-byte name segment
+                 *
+                 * Examine the name prefix opcode, if any, to determine the number of
+                 * segments.
+                 */
+                switch (*path) {
+                case 0:
+                        /*
+                         * Null name after a root or parent prefixes. We already
+                         * have the correct target node and there are no name segments.
+                         */
+                        num_segments = 0;
+                        type = this_node->type;
+
+                        ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
+                                          "Prefix-only Pathname (Zero name segments), Flags=%X\n",
+                                          flags));
+                        break;
+
+                case AML_DUAL_NAME_PREFIX:
+
+                        /* More than one name_seg, search rules do not apply */
+
+                        search_parent_flag = ACPI_NS_NO_UPSEARCH;
+
+                        /* Two segments, point to first name segment */
+
+                        num_segments = 2;
+                        path++;
+
+                        ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
+                                          "Dual Pathname (2 segments, Flags=%X)\n",
+                                          flags));
+                        break;
+
+                case AML_MULTI_NAME_PREFIX_OP:
+
+                        /* More than one name_seg, search rules do not apply */
+
+                        search_parent_flag = ACPI_NS_NO_UPSEARCH;
+
+                        /* Extract segment count, point to first name segment */
+
+                        path++;
+                        num_segments = (u32) (u8) * path;
+                        path++;
+
+                        ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
+                                          "Multi Pathname (%d Segments, Flags=%X)\n",
+                                          num_segments, flags));
+                        break;
+
+                default:
+                        /*
+                         * Not a Null name, no Dual or Multi prefix, hence there is
+                         * only one name segment and Pathname is already pointing to it.
+                         */
+                        num_segments = 1;
+
+                        ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
+                                          "Simple Pathname (1 segment, Flags=%X)\n",
+                                          flags));
+                        break;
+                }
+
+                ACPI_DEBUG_EXEC(acpi_ns_print_pathname(num_segments, path));
+        }
+
+        /*
+         * Search namespace for each segment of the name. Loop through and
+         * verify (or add to the namespace) each name segment.
+         *
+         * The object type is significant only at the last name
+         * segment. (We don't care about the types along the path, only
+         * the type of the final target object.)
+         */
+        this_search_type = ACPI_TYPE_ANY;
+        current_node = this_node;
+        while (num_segments && current_node) {
+                num_segments--;
+                if (!num_segments) {
+                        /*
+                         * This is the last segment, enable typechecking
+                         */
+                        this_search_type = type;
+
+                        /*
+                         * Only allow automatic parent search (search rules) if the caller
+                         * requested it AND we have a single, non-fully-qualified name_seg
+                         */
+                        if ((search_parent_flag != ACPI_NS_NO_UPSEARCH) &&
+                            (flags & ACPI_NS_SEARCH_PARENT)) {
+                                local_flags |= ACPI_NS_SEARCH_PARENT;
+                        }
+
+                        /* Set error flag according to caller */
+
+                        if (flags & ACPI_NS_ERROR_IF_FOUND) {
+                                local_flags |= ACPI_NS_ERROR_IF_FOUND;
+                        }
+                }
+
+                /* Extract one ACPI name from the front of the pathname */
+
+                ACPI_MOVE_32_TO_32(&simple_name, path);
+
+                /* Try to find the single (4 character) ACPI name */
+
+                status =
+                    acpi_ns_search_and_enter(simple_name, walk_state,
+                                             current_node, interpreter_mode,
+                                             this_search_type, local_flags,
+                                             &this_node);
+                if (ACPI_FAILURE(status)) {
+                        if (status == AE_NOT_FOUND) {
+
+                                /* Name not found in ACPI namespace */
+
+                                ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
+                                                  "Name [%4.4s] not found in scope [%4.4s] %p\n",
+                                                  (char *)&simple_name,
+                                                  (char *)&current_node->name,
+                                                  current_node));
+                        }
+
+                        *return_node = this_node;
+                        return_ACPI_STATUS(status);
+                }
+
+                /* More segments to follow? */
+
+                if (num_segments > 0) {
+                        /*
+                         * If we have an alias to an object that opens a scope (such as a
+                         * device or processor), we need to dereference the alias here so that
+                         * we can access any children of the original node (via the remaining
+                         * segments).
+                         */
+                        if (this_node->type == ACPI_TYPE_LOCAL_ALIAS) {
+                                if (!this_node->object) {
+                                        return_ACPI_STATUS(AE_NOT_EXIST);
+                                }
+
+                                if (acpi_ns_opens_scope
+                                    (((struct acpi_namespace_node *)this_node->
+                                      object)->type)) {
+                                        this_node =
+                                            (struct acpi_namespace_node *)
+                                            this_node->object;
+                                }
+                        }
+                }
+
+                /* Special handling for the last segment (num_segments == 0) */
+
+                else {
+                        /*
+                         * Sanity typecheck of the target object:
+                         *
+                         * If 1) This is the last segment (num_segments == 0)
+                         *    2) And we are looking for a specific type
+                         *       (Not checking for TYPE_ANY)
+                         *    3) Which is not an alias
+                         *    4) Which is not a local type (TYPE_SCOPE)
+                         *    5) And the type of target object is known (not TYPE_ANY)
+                         *    6) And target object does not match what we are looking for
+                         *
+                         * Then we have a type mismatch. Just warn and ignore it.
+                         */
+                        if ((type_to_check_for != ACPI_TYPE_ANY) &&
+                            (type_to_check_for != ACPI_TYPE_LOCAL_ALIAS) &&
+                            (type_to_check_for != ACPI_TYPE_LOCAL_METHOD_ALIAS)
+                            && (type_to_check_for != ACPI_TYPE_LOCAL_SCOPE)
+                            && (this_node->type != ACPI_TYPE_ANY)
+                            && (this_node->type != type_to_check_for)) {
+
+                                /* Complain about a type mismatch */
+
+                                ACPI_WARNING((AE_INFO,
+                                              "NsLookup: Type mismatch on %4.4s (%s), searching for (%s)",
+                                              ACPI_CAST_PTR(char, &simple_name),
+                                              acpi_ut_get_type_name(this_node->
+                                                                    type),
+                                              acpi_ut_get_type_name
+                                              (type_to_check_for)));
+                        }
+
+                        /*
+                         * If this is the last name segment and we are not looking for a
+                         * specific type, but the type of found object is known, use that type
+                         * to (later) see if it opens a scope.
+                         */
+                        if (type == ACPI_TYPE_ANY) {
+                                type = this_node->type;
+                        }
+                }
+
+                /* Point to next name segment and make this node current */
+
+                path += ACPI_NAME_SIZE;
+                current_node = this_node;
+        }
+
+        /*
+         * Always check if we need to open a new scope
+         */
+        if (!(flags & ACPI_NS_DONT_OPEN_SCOPE) && (walk_state)) {
+                /*
+                 * If entry is a type which opens a scope, push the new scope on the
+                 * scope stack.
+                 */
+                if (acpi_ns_opens_scope(type)) {
+                        status =
+                            acpi_ds_scope_stack_push(this_node, type,
+                                                     walk_state);
+                        if (ACPI_FAILURE(status)) {
+                                return_ACPI_STATUS(status);
+                        }
+                }
+        }
+
+        *return_node = this_node;
+        return_ACPI_STATUS(AE_OK);
+}