1 files changed, 593 insertions, 0 deletions

diff --git a/drivers/acpi/acpica/nsinit.c b/drivers/acpi/acpica/nsinit.c
new file mode 100644
index 000000000000..13501cb81863
--- /dev/null
+++ b/drivers/acpi/acpica/nsinit.c
@@ -0,0 +1,593 @@
+/******************************************************************************
+ *
+ * Module Name: nsinit - namespace initialization
+ *
+ *****************************************************************************/
+
+/*
+ * 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 "acnamesp.h"
+#include "acdispat.h"
+#include "acinterp.h"
+#include <linux/nmi.h>
+
+#define _COMPONENT          ACPI_NAMESPACE
+ACPI_MODULE_NAME("nsinit")
+
+/* Local prototypes */
+static acpi_status
+acpi_ns_init_one_object(acpi_handle obj_handle,
+                        u32 level, void *context, void **return_value);
+
+static acpi_status
+acpi_ns_init_one_device(acpi_handle obj_handle,
+                        u32 nesting_level, void *context, void **return_value);
+
+static acpi_status
+acpi_ns_find_ini_methods(acpi_handle obj_handle,
+                         u32 nesting_level, void *context, void **return_value);
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ns_initialize_objects
+ *
+ * PARAMETERS:  None
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Walk the entire namespace and perform any necessary
+ *              initialization on the objects found therein
+ *
+ ******************************************************************************/
+
+acpi_status acpi_ns_initialize_objects(void)
+{
+        acpi_status status;
+        struct acpi_init_walk_info info;
+
+        ACPI_FUNCTION_TRACE(ns_initialize_objects);
+
+        ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
+                          "**** Starting initialization of namespace objects ****\n"));
+        ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT,
+                              "Completing Region/Field/Buffer/Package initialization:"));
+
+        /* Set all init info to zero */
+
+        ACPI_MEMSET(&info, 0, sizeof(struct acpi_init_walk_info));
+
+        /* Walk entire namespace from the supplied root */
+
+        status = acpi_walk_namespace(ACPI_TYPE_ANY, ACPI_ROOT_OBJECT,
+                                     ACPI_UINT32_MAX, acpi_ns_init_one_object,
+                                     &info, NULL);
+        if (ACPI_FAILURE(status)) {
+                ACPI_EXCEPTION((AE_INFO, status, "During WalkNamespace"));
+        }
+
+        ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT,
+                              "\nInitialized %hd/%hd Regions %hd/%hd Fields %hd/%hd Buffers %hd/%hd Packages (%hd nodes)\n",
+                              info.op_region_init, info.op_region_count,
+                              info.field_init, info.field_count,
+                              info.buffer_init, info.buffer_count,
+                              info.package_init, info.package_count,
+                              info.object_count));
+
+        ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
+                          "%hd Control Methods found\n", info.method_count));
+        ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
+                          "%hd Op Regions found\n", info.op_region_count));
+
+        return_ACPI_STATUS(AE_OK);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ns_initialize_devices
+ *
+ * PARAMETERS:  None
+ *
+ * RETURN:      acpi_status
+ *
+ * DESCRIPTION: Walk the entire namespace and initialize all ACPI devices.
+ *              This means running _INI on all present devices.
+ *
+ *              Note: We install PCI config space handler on region access,
+ *              not here.
+ *
+ ******************************************************************************/
+
+acpi_status acpi_ns_initialize_devices(void)
+{
+        acpi_status status;
+        struct acpi_device_walk_info info;
+
+        ACPI_FUNCTION_TRACE(ns_initialize_devices);
+
+        /* Init counters */
+
+        info.device_count = 0;
+        info.num_STA = 0;
+        info.num_INI = 0;
+
+        ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT,
+                              "Initializing Device/Processor/Thermal objects by executing _INI methods:"));
+
+        /* Tree analysis: find all subtrees that contain _INI methods */
+
+        status = acpi_ns_walk_namespace(ACPI_TYPE_ANY, ACPI_ROOT_OBJECT,
+                                        ACPI_UINT32_MAX, FALSE,
+                                        acpi_ns_find_ini_methods, &info, NULL);
+        if (ACPI_FAILURE(status)) {
+                goto error_exit;
+        }
+
+        /* Allocate the evaluation information block */
+
+        info.evaluate_info =
+            ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info));
+        if (!info.evaluate_info) {
+                status = AE_NO_MEMORY;
+                goto error_exit;
+        }
+
+        /* Walk namespace to execute all _INIs on present devices */
+
+        status = acpi_ns_walk_namespace(ACPI_TYPE_ANY, ACPI_ROOT_OBJECT,
+                                        ACPI_UINT32_MAX, FALSE,
+                                        acpi_ns_init_one_device, &info, NULL);
+
+        ACPI_FREE(info.evaluate_info);
+        if (ACPI_FAILURE(status)) {
+                goto error_exit;
+        }
+
+        ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT,
+                              "\nExecuted %hd _INI methods requiring %hd _STA executions (examined %hd objects)\n",
+                              info.num_INI, info.num_STA, info.device_count));
+
+        return_ACPI_STATUS(status);
+
+      error_exit:
+        ACPI_EXCEPTION((AE_INFO, status, "During device initialization"));
+        return_ACPI_STATUS(status);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ns_init_one_object
+ *
+ * PARAMETERS:  obj_handle      - Node
+ *              Level           - Current nesting level
+ *              Context         - Points to a init info struct
+ *              return_value    - Not used
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Callback from acpi_walk_namespace. Invoked for every object
+ *              within the  namespace.
+ *
+ *              Currently, the only objects that require initialization are:
+ *              1) Methods
+ *              2) Op Regions
+ *
+ ******************************************************************************/
+
+static acpi_status
+acpi_ns_init_one_object(acpi_handle obj_handle,
+                        u32 level, void *context, void **return_value)
+{
+        acpi_object_type type;
+        acpi_status status = AE_OK;
+        struct acpi_init_walk_info *info =
+            (struct acpi_init_walk_info *)context;
+        struct acpi_namespace_node *node =
+            (struct acpi_namespace_node *)obj_handle;
+        union acpi_operand_object *obj_desc;
+
+        ACPI_FUNCTION_NAME(ns_init_one_object);
+
+        info->object_count++;
+
+        /* And even then, we are only interested in a few object types */
+
+        type = acpi_ns_get_type(obj_handle);
+        obj_desc = acpi_ns_get_attached_object(node);
+        if (!obj_desc) {
+                return (AE_OK);
+        }
+
+        /* Increment counters for object types we are looking for */
+
+        switch (type) {
+        case ACPI_TYPE_REGION:
+                info->op_region_count++;
+                break;
+
+        case ACPI_TYPE_BUFFER_FIELD:
+                info->field_count++;
+                break;
+
+        case ACPI_TYPE_LOCAL_BANK_FIELD:
+                info->field_count++;
+                break;
+
+        case ACPI_TYPE_BUFFER:
+                info->buffer_count++;
+                break;
+
+        case ACPI_TYPE_PACKAGE:
+                info->package_count++;
+                break;
+
+        default:
+
+                /* No init required, just exit now */
+                return (AE_OK);
+        }
+
+        /*
+         * If the object is already initialized, nothing else to do
+         */
+        if (obj_desc->common.flags & AOPOBJ_DATA_VALID) {
+                return (AE_OK);
+        }
+
+        /*
+         * Must lock the interpreter before executing AML code
+         */
+        acpi_ex_enter_interpreter();
+
+        /*
+         * Each of these types can contain executable AML code within the
+         * declaration.
+         */
+        switch (type) {
+        case ACPI_TYPE_REGION:
+
+                info->op_region_init++;
+                status = acpi_ds_get_region_arguments(obj_desc);
+                break;
+
+        case ACPI_TYPE_BUFFER_FIELD:
+
+                info->field_init++;
+                status = acpi_ds_get_buffer_field_arguments(obj_desc);
+                break;
+
+        case ACPI_TYPE_LOCAL_BANK_FIELD:
+
+                info->field_init++;
+                status = acpi_ds_get_bank_field_arguments(obj_desc);
+                break;
+
+        case ACPI_TYPE_BUFFER:
+
+                info->buffer_init++;
+                status = acpi_ds_get_buffer_arguments(obj_desc);
+                break;
+
+        case ACPI_TYPE_PACKAGE:
+
+                info->package_init++;
+                status = acpi_ds_get_package_arguments(obj_desc);
+                break;
+
+        default:
+                /* No other types can get here */
+                break;
+        }
+
+        if (ACPI_FAILURE(status)) {
+                ACPI_EXCEPTION((AE_INFO, status,
+                                "Could not execute arguments for [%4.4s] (%s)",
+                                acpi_ut_get_node_name(node),
+                                acpi_ut_get_type_name(type)));
+        }
+
+        /*
+         * Print a dot for each object unless we are going to print the entire
+         * pathname
+         */
+        if (!(acpi_dbg_level & ACPI_LV_INIT_NAMES)) {
+                ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT, "."));
+        }
+
+        /*
+         * We ignore errors from above, and always return OK, since we don't want
+         * to abort the walk on any single error.
+         */
+        acpi_ex_exit_interpreter();
+        return (AE_OK);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ns_find_ini_methods
+ *
+ * PARAMETERS:  acpi_walk_callback
+ *
+ * RETURN:      acpi_status
+ *
+ * DESCRIPTION: Called during namespace walk. Finds objects named _INI under
+ *              device/processor/thermal objects, and marks the entire subtree
+ *              with a SUBTREE_HAS_INI flag. This flag is used during the
+ *              subsequent device initialization walk to avoid entire subtrees
+ *              that do not contain an _INI.
+ *
+ ******************************************************************************/
+
+static acpi_status
+acpi_ns_find_ini_methods(acpi_handle obj_handle,
+                         u32 nesting_level, void *context, void **return_value)
+{
+        struct acpi_device_walk_info *info =
+            ACPI_CAST_PTR(struct acpi_device_walk_info, context);
+        struct acpi_namespace_node *node;
+        struct acpi_namespace_node *parent_node;
+
+        /* Keep count of device/processor/thermal objects */
+
+        node = ACPI_CAST_PTR(struct acpi_namespace_node, obj_handle);
+        if ((node->type == ACPI_TYPE_DEVICE) ||
+            (node->type == ACPI_TYPE_PROCESSOR) ||
+            (node->type == ACPI_TYPE_THERMAL)) {
+                info->device_count++;
+                return (AE_OK);
+        }
+
+        /* We are only looking for methods named _INI */
+
+        if (!ACPI_COMPARE_NAME(node->name.ascii, METHOD_NAME__INI)) {
+                return (AE_OK);
+        }
+
+        /*
+         * The only _INI methods that we care about are those that are
+         * present under Device, Processor, and Thermal objects.
+         */
+        parent_node = acpi_ns_get_parent_node(node);
+        switch (parent_node->type) {
+        case ACPI_TYPE_DEVICE:
+        case ACPI_TYPE_PROCESSOR:
+        case ACPI_TYPE_THERMAL:
+
+                /* Mark parent and bubble up the INI present flag to the root */
+
+                while (parent_node) {
+                        parent_node->flags |= ANOBJ_SUBTREE_HAS_INI;
+                        parent_node = acpi_ns_get_parent_node(parent_node);
+                }
+                break;
+
+        default:
+                break;
+        }
+
+        return (AE_OK);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ns_init_one_device
+ *
+ * PARAMETERS:  acpi_walk_callback
+ *
+ * RETURN:      acpi_status
+ *
+ * DESCRIPTION: This is called once per device soon after ACPI is enabled
+ *              to initialize each device. It determines if the device is
+ *              present, and if so, calls _INI.
+ *
+ ******************************************************************************/
+
+static acpi_status
+acpi_ns_init_one_device(acpi_handle obj_handle,
+                        u32 nesting_level, void *context, void **return_value)
+{
+        struct acpi_device_walk_info *walk_info =
+            ACPI_CAST_PTR(struct acpi_device_walk_info, context);
+        struct acpi_evaluate_info *info = walk_info->evaluate_info;
+        u32 flags;
+        acpi_status status;
+        struct acpi_namespace_node *device_node;
+
+        ACPI_FUNCTION_TRACE(ns_init_one_device);
+
+        /* We are interested in Devices, Processors and thermal_zones only */
+
+        device_node = ACPI_CAST_PTR(struct acpi_namespace_node, obj_handle);
+        if ((device_node->type != ACPI_TYPE_DEVICE) &&
+            (device_node->type != ACPI_TYPE_PROCESSOR) &&
+            (device_node->type != ACPI_TYPE_THERMAL)) {
+                return_ACPI_STATUS(AE_OK);
+        }
+
+        /*
+         * Because of an earlier namespace analysis, all subtrees that contain an
+         * _INI method are tagged.
+         *
+         * If this device subtree does not contain any _INI methods, we
+         * can exit now and stop traversing this entire subtree.
+         */
+        if (!(device_node->flags & ANOBJ_SUBTREE_HAS_INI)) {
+                return_ACPI_STATUS(AE_CTRL_DEPTH);
+        }
+
+        /*
+         * Run _STA to determine if this device is present and functioning. We
+         * must know this information for two important reasons (from ACPI spec):
+         *
+         * 1) We can only run _INI if the device is present.
+         * 2) We must abort the device tree walk on this subtree if the device is
+         *    not present and is not functional (we will not examine the children)
+         *
+         * The _STA method is not required to be present under the device, we
+         * assume the device is present if _STA does not exist.
+         */
+        ACPI_DEBUG_EXEC(acpi_ut_display_init_pathname
+                        (ACPI_TYPE_METHOD, device_node, METHOD_NAME__STA));
+
+        status = acpi_ut_execute_STA(device_node, &flags);
+        if (ACPI_FAILURE(status)) {
+
+                /* Ignore error and move on to next device */
+
+                return_ACPI_STATUS(AE_OK);
+        }
+
+        /*
+         * Flags == -1 means that _STA was not found. In this case, we assume that
+         * the device is both present and functional.
+         *
+         * From the ACPI spec, description of _STA:
+         *
+         * "If a device object (including the processor object) does not have an
+         * _STA object, then OSPM assumes that all of the above bits are set (in
+         * other words, the device is present, ..., and functioning)"
+         */
+        if (flags != ACPI_UINT32_MAX) {
+                walk_info->num_STA++;
+        }
+
+        /*
+         * Examine the PRESENT and FUNCTIONING status bits
+         *
+         * Note: ACPI spec does not seem to specify behavior for the present but
+         * not functioning case, so we assume functioning if present.
+         */
+        if (!(flags & ACPI_STA_DEVICE_PRESENT)) {
+
+                /* Device is not present, we must examine the Functioning bit */
+
+                if (flags & ACPI_STA_DEVICE_FUNCTIONING) {
+                        /*
+                         * Device is not present but is "functioning". In this case,
+                         * we will not run _INI, but we continue to examine the children
+                         * of this device.
+                         *
+                         * From the ACPI spec, description of _STA: (Note - no mention
+                         * of whether to run _INI or not on the device in question)
+                         *
+                         * "_STA may return bit 0 clear (not present) with bit 3 set
+                         * (device is functional). This case is used to indicate a valid
+                         * device for which no device driver should be loaded (for example,
+                         * a bridge device.) Children of this device may be present and
+                         * valid. OSPM should continue enumeration below a device whose
+                         * _STA returns this bit combination"
+                         */
+                        return_ACPI_STATUS(AE_OK);
+                } else {
+                        /*
+                         * Device is not present and is not functioning. We must abort the
+                         * walk of this subtree immediately -- don't look at the children
+                         * of such a device.
+                         *
+                         * From the ACPI spec, description of _INI:
+                         *
+                         * "If the _STA method indicates that the device is not present,
+                         * OSPM will not run the _INI and will not examine the children
+                         * of the device for _INI methods"
+                         */
+                        return_ACPI_STATUS(AE_CTRL_DEPTH);
+                }
+        }
+
+        /*
+         * The device is present or is assumed present if no _STA exists.
+         * Run the _INI if it exists (not required to exist)
+         *
+         * Note: We know there is an _INI within this subtree, but it may not be
+         * under this particular device, it may be lower in the branch.
+         */
+        ACPI_DEBUG_EXEC(acpi_ut_display_init_pathname
+                        (ACPI_TYPE_METHOD, device_node, METHOD_NAME__INI));
+
+        info->prefix_node = device_node;
+        info->pathname = METHOD_NAME__INI;
+        info->parameters = NULL;
+        info->flags = ACPI_IGNORE_RETURN_VALUE;
+
+        /*
+         * Some hardware relies on this being executed as atomically
+         * as possible (without an NMI being received in the middle of
+         * this) - so disable NMIs and initialize the device:
+         */
+        acpi_nmi_disable();
+        status = acpi_ns_evaluate(info);
+        acpi_nmi_enable();
+
+        if (ACPI_SUCCESS(status)) {
+                walk_info->num_INI++;
+
+                if ((acpi_dbg_level <= ACPI_LV_ALL_EXCEPTIONS) &&
+                    (!(acpi_dbg_level & ACPI_LV_INFO))) {
+                        ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT, "."));
+                }
+        }
+#ifdef ACPI_DEBUG_OUTPUT
+        else if (status != AE_NOT_FOUND) {
+
+                /* Ignore error and move on to next device */
+
+                char *scope_name =
+                    acpi_ns_get_external_pathname(info->resolved_node);
+
+                ACPI_EXCEPTION((AE_INFO, status, "during %s._INI execution",
+                                scope_name));
+                ACPI_FREE(scope_name);
+        }
+#endif
+
+        /* Ignore errors from above */
+
+        status = AE_OK;
+
+        /*
+         * The _INI method has been run if present; call the Global Initialization
+         * Handler for this device.
+         */
+        if (acpi_gbl_init_handler) {
+                status =
+                    acpi_gbl_init_handler(device_node, ACPI_INIT_DEVICE_INI);
+        }
+
+        return_ACPI_STATUS(status);
+}