1 files changed, 551 insertions, 0 deletions

diff --git a/drivers/acpi/acpica/exconfig.c b/drivers/acpi/acpica/exconfig.c
new file mode 100644
index 000000000..d7d74ef87
--- /dev/null
+++ b/drivers/acpi/acpica/exconfig.c
@@ -0,0 +1,551 @@
+// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
+/******************************************************************************
+ *
+ * Module Name: exconfig - Namespace reconfiguration (Load/Unload opcodes)
+ *
+ * Copyright (C) 2000 - 2022, Intel Corp.
+ *
+ *****************************************************************************/
+
+#include <acpi/acpi.h>
+#include "accommon.h"
+#include "acinterp.h"
+#include "acnamesp.h"
+#include "actables.h"
+#include "acdispat.h"
+#include "acevents.h"
+#include "amlcode.h"
+
+#define _COMPONENT          ACPI_EXECUTER
+ACPI_MODULE_NAME("exconfig")
+
+/* Local prototypes */
+static acpi_status
+acpi_ex_add_table(u32 table_index, union acpi_operand_object **ddb_handle);
+
+static acpi_status
+acpi_ex_region_read(union acpi_operand_object *obj_desc,
+		    u32 length, u8 *buffer);
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ex_add_table
+ *
+ * PARAMETERS:  table               - Pointer to raw table
+ *              parent_node         - Where to load the table (scope)
+ *              ddb_handle          - Where to return the table handle.
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Common function to Install and Load an ACPI table with a
+ *              returned table handle.
+ *
+ ******************************************************************************/
+
+static acpi_status
+acpi_ex_add_table(u32 table_index, union acpi_operand_object **ddb_handle)
+{
+	union acpi_operand_object *obj_desc;
+
+	ACPI_FUNCTION_TRACE(ex_add_table);
+
+	/* Create an object to be the table handle */
+
+	obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_LOCAL_REFERENCE);
+	if (!obj_desc) {
+		return_ACPI_STATUS(AE_NO_MEMORY);
+	}
+
+	/* Init the table handle */
+
+	obj_desc->common.flags |= AOPOBJ_DATA_VALID;
+	obj_desc->reference.class = ACPI_REFCLASS_TABLE;
+	obj_desc->reference.value = table_index;
+	*ddb_handle = obj_desc;
+	return_ACPI_STATUS(AE_OK);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ex_load_table_op
+ *
+ * PARAMETERS:  walk_state          - Current state with operands
+ *              return_desc         - Where to store the return object
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Load an ACPI table from the RSDT/XSDT
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_ex_load_table_op(struct acpi_walk_state *walk_state,
+		      union acpi_operand_object **return_desc)
+{
+	acpi_status status;
+	union acpi_operand_object **operand = &walk_state->operands[0];
+	struct acpi_namespace_node *parent_node;
+	struct acpi_namespace_node *start_node;
+	struct acpi_namespace_node *parameter_node = NULL;
+	union acpi_operand_object *return_obj;
+	union acpi_operand_object *ddb_handle;
+	u32 table_index;
+
+	ACPI_FUNCTION_TRACE(ex_load_table_op);
+
+	/* Create the return object */
+
+	return_obj = acpi_ut_create_integer_object((u64)0);
+	if (!return_obj) {
+		return_ACPI_STATUS(AE_NO_MEMORY);
+	}
+
+	*return_desc = return_obj;
+
+	/* Find the ACPI table in the RSDT/XSDT */
+
+	acpi_ex_exit_interpreter();
+	status = acpi_tb_find_table(operand[0]->string.pointer,
+				    operand[1]->string.pointer,
+				    operand[2]->string.pointer, &table_index);
+	acpi_ex_enter_interpreter();
+	if (ACPI_FAILURE(status)) {
+		if (status != AE_NOT_FOUND) {
+			return_ACPI_STATUS(status);
+		}
+
+		/* Table not found, return an Integer=0 and AE_OK */
+
+		return_ACPI_STATUS(AE_OK);
+	}
+
+	/* Default nodes */
+
+	start_node = walk_state->scope_info->scope.node;
+	parent_node = acpi_gbl_root_node;
+
+	/* root_path (optional parameter) */
+
+	if (operand[3]->string.length > 0) {
+		/*
+		 * Find the node referenced by the root_path_string. This is the
+		 * location within the namespace where the table will be loaded.
+		 */
+		status = acpi_ns_get_node_unlocked(start_node,
+						   operand[3]->string.pointer,
+						   ACPI_NS_SEARCH_PARENT,
+						   &parent_node);
+		if (ACPI_FAILURE(status)) {
+			return_ACPI_STATUS(status);
+		}
+	}
+
+	/* parameter_path (optional parameter) */
+
+	if (operand[4]->string.length > 0) {
+		if ((operand[4]->string.pointer[0] != AML_ROOT_PREFIX) &&
+		    (operand[4]->string.pointer[0] != AML_PARENT_PREFIX)) {
+			/*
+			 * Path is not absolute, so it will be relative to the node
+			 * referenced by the root_path_string (or the NS root if omitted)
+			 */
+			start_node = parent_node;
+		}
+
+		/* Find the node referenced by the parameter_path_string */
+
+		status = acpi_ns_get_node_unlocked(start_node,
+						   operand[4]->string.pointer,
+						   ACPI_NS_SEARCH_PARENT,
+						   &parameter_node);
+		if (ACPI_FAILURE(status)) {
+			return_ACPI_STATUS(status);
+		}
+	}
+
+	/* Load the table into the namespace */
+
+	ACPI_INFO(("Dynamic OEM Table Load:"));
+	acpi_ex_exit_interpreter();
+	status = acpi_tb_load_table(table_index, parent_node);
+	acpi_ex_enter_interpreter();
+	if (ACPI_FAILURE(status)) {
+		return_ACPI_STATUS(status);
+	}
+
+	status = acpi_ex_add_table(table_index, &ddb_handle);
+	if (ACPI_FAILURE(status)) {
+		return_ACPI_STATUS(status);
+	}
+
+	/* Complete the initialization/resolution of new objects */
+
+	acpi_ex_exit_interpreter();
+	acpi_ns_initialize_objects();
+	acpi_ex_enter_interpreter();
+
+	/* Parameter Data (optional) */
+
+	if (parameter_node) {
+
+		/* Store the parameter data into the optional parameter object */
+
+		status = acpi_ex_store(operand[5],
+				       ACPI_CAST_PTR(union acpi_operand_object,
+						     parameter_node),
+				       walk_state);
+		if (ACPI_FAILURE(status)) {
+			(void)acpi_ex_unload_table(ddb_handle);
+
+			acpi_ut_remove_reference(ddb_handle);
+			return_ACPI_STATUS(status);
+		}
+	}
+
+	/* Remove the reference to ddb_handle created by acpi_ex_add_table above */
+
+	acpi_ut_remove_reference(ddb_handle);
+
+	/* Return -1 (non-zero) indicates success */
+
+	return_obj->integer.value = 0xFFFFFFFFFFFFFFFF;
+	return_ACPI_STATUS(status);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ex_region_read
+ *
+ * PARAMETERS:  obj_desc        - Region descriptor
+ *              length          - Number of bytes to read
+ *              buffer          - Pointer to where to put the data
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Read data from an operation region. The read starts from the
+ *              beginning of the region.
+ *
+ ******************************************************************************/
+
+static acpi_status
+acpi_ex_region_read(union acpi_operand_object *obj_desc, u32 length, u8 *buffer)
+{
+	acpi_status status;
+	u64 value;
+	u32 region_offset = 0;
+	u32 i;
+
+	/* Bytewise reads */
+
+	for (i = 0; i < length; i++) {
+		status =
+		    acpi_ev_address_space_dispatch(obj_desc, NULL, ACPI_READ,
+						   region_offset, 8, &value);
+		if (ACPI_FAILURE(status)) {
+			return (status);
+		}
+
+		*buffer = (u8)value;
+		buffer++;
+		region_offset++;
+	}
+
+	return (AE_OK);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ex_load_op
+ *
+ * PARAMETERS:  obj_desc        - Region or Buffer/Field where the table will be
+ *                                obtained
+ *              target          - Where the status of the load will be stored
+ *              walk_state      - Current state
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Load an ACPI table from a field or operation region
+ *
+ * NOTE: Region Fields (Field, bank_field, index_fields) are resolved to buffer
+ *       objects before this code is reached.
+ *
+ *       If source is an operation region, it must refer to system_memory, as
+ *       per the ACPI specification.
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_ex_load_op(union acpi_operand_object *obj_desc,
+		union acpi_operand_object *target,
+		struct acpi_walk_state *walk_state)
+{
+	union acpi_operand_object *ddb_handle;
+	struct acpi_table_header *table_header;
+	struct acpi_table_header *table;
+	u32 table_index;
+	acpi_status status;
+	u32 length;
+
+	ACPI_FUNCTION_TRACE(ex_load_op);
+
+	if (target->common.descriptor_type == ACPI_DESC_TYPE_NAMED) {
+		target =
+		    acpi_ns_get_attached_object(ACPI_CAST_PTR
+						(struct acpi_namespace_node,
+						 target));
+	}
+	if (target->common.type != ACPI_TYPE_INTEGER) {
+		ACPI_EXCEPTION((AE_INFO, AE_TYPE,
+				"Type not integer: %X\n", target->common.type));
+		return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
+	}
+
+	target->integer.value = 0;
+
+	/* Source Object can be either an op_region or a Buffer/Field */
+
+	switch (obj_desc->common.type) {
+	case ACPI_TYPE_REGION:
+
+		ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
+				  "Load table from Region %p\n", obj_desc));
+
+		/* Region must be system_memory (from ACPI spec) */
+
+		if (obj_desc->region.space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY) {
+			return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
+		}
+
+		/*
+		 * If the Region Address and Length have not been previously
+		 * evaluated, evaluate them now and save the results.
+		 */
+		if (!(obj_desc->common.flags & AOPOBJ_DATA_VALID)) {
+			status = acpi_ds_get_region_arguments(obj_desc);
+			if (ACPI_FAILURE(status)) {
+				return_ACPI_STATUS(status);
+			}
+		}
+
+		/* Get the table header first so we can get the table length */
+
+		table_header = ACPI_ALLOCATE(sizeof(struct acpi_table_header));
+		if (!table_header) {
+			return_ACPI_STATUS(AE_NO_MEMORY);
+		}
+
+		status =
+		    acpi_ex_region_read(obj_desc,
+					sizeof(struct acpi_table_header),
+					ACPI_CAST_PTR(u8, table_header));
+		length = table_header->length;
+		ACPI_FREE(table_header);
+
+		if (ACPI_FAILURE(status)) {
+			return_ACPI_STATUS(status);
+		}
+
+		/* Must have at least an ACPI table header */
+
+		if (length < sizeof(struct acpi_table_header)) {
+			return_ACPI_STATUS(AE_INVALID_TABLE_LENGTH);
+		}
+
+		/*
+		 * The original implementation simply mapped the table, with no copy.
+		 * However, the memory region is not guaranteed to remain stable and
+		 * we must copy the table to a local buffer. For example, the memory
+		 * region is corrupted after suspend on some machines. Dynamically
+		 * loaded tables are usually small, so this overhead is minimal.
+		 *
+		 * The latest implementation (5/2009) does not use a mapping at all.
+		 * We use the low-level operation region interface to read the table
+		 * instead of the obvious optimization of using a direct mapping.
+		 * This maintains a consistent use of operation regions across the
+		 * entire subsystem. This is important if additional processing must
+		 * be performed in the (possibly user-installed) operation region
+		 * handler. For example, acpi_exec and ASLTS depend on this.
+		 */
+
+		/* Allocate a buffer for the table */
+
+		table = ACPI_ALLOCATE(length);
+		if (!table) {
+			return_ACPI_STATUS(AE_NO_MEMORY);
+		}
+
+		/* Read the entire table */
+
+		status = acpi_ex_region_read(obj_desc, length,
+					     ACPI_CAST_PTR(u8, table));
+		if (ACPI_FAILURE(status)) {
+			ACPI_FREE(table);
+			return_ACPI_STATUS(status);
+		}
+		break;
+
+	case ACPI_TYPE_BUFFER:	/* Buffer or resolved region_field */
+
+		ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
+				  "Load table from Buffer or Field %p\n",
+				  obj_desc));
+
+		/* Must have at least an ACPI table header */
+
+		if (obj_desc->buffer.length < sizeof(struct acpi_table_header)) {
+			return_ACPI_STATUS(AE_INVALID_TABLE_LENGTH);
+		}
+
+		/* Get the actual table length from the table header */
+
+		table_header =
+		    ACPI_CAST_PTR(struct acpi_table_header,
+				  obj_desc->buffer.pointer);
+		length = table_header->length;
+
+		/* Table cannot extend beyond the buffer */
+
+		if (length > obj_desc->buffer.length) {
+			return_ACPI_STATUS(AE_AML_BUFFER_LIMIT);
+		}
+		if (length < sizeof(struct acpi_table_header)) {
+			return_ACPI_STATUS(AE_INVALID_TABLE_LENGTH);
+		}
+
+		/*
+		 * Copy the table from the buffer because the buffer could be
+		 * modified or even deleted in the future
+		 */
+		table = ACPI_ALLOCATE(length);
+		if (!table) {
+			return_ACPI_STATUS(AE_NO_MEMORY);
+		}
+
+		memcpy(table, table_header, length);
+		break;
+
+	default:
+
+		return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
+	}
+
+	/* Install the new table into the local data structures */
+
+	ACPI_INFO(("Dynamic OEM Table Load:"));
+	acpi_ex_exit_interpreter();
+	status = acpi_tb_install_and_load_table(ACPI_PTR_TO_PHYSADDR(table),
+						ACPI_TABLE_ORIGIN_INTERNAL_VIRTUAL,
+						table, TRUE, &table_index);
+	acpi_ex_enter_interpreter();
+	if (ACPI_FAILURE(status)) {
+
+		/* Delete allocated table buffer */
+
+		ACPI_FREE(table);
+		return_ACPI_STATUS(status);
+	}
+
+	/*
+	 * Add the table to the namespace.
+	 *
+	 * Note: Load the table objects relative to the root of the namespace.
+	 * This appears to go against the ACPI specification, but we do it for
+	 * compatibility with other ACPI implementations.
+	 */
+	status = acpi_ex_add_table(table_index, &ddb_handle);
+	if (ACPI_FAILURE(status)) {
+		return_ACPI_STATUS(status);
+	}
+
+	/* Complete the initialization/resolution of new objects */
+
+	acpi_ex_exit_interpreter();
+	acpi_ns_initialize_objects();
+	acpi_ex_enter_interpreter();
+
+	/* Remove the reference to ddb_handle created by acpi_ex_add_table above */
+
+	acpi_ut_remove_reference(ddb_handle);
+
+	/* Return -1 (non-zero) indicates success */
+
+	target->integer.value = 0xFFFFFFFFFFFFFFFF;
+	return_ACPI_STATUS(status);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ex_unload_table
+ *
+ * PARAMETERS:  ddb_handle          - Handle to a previously loaded table
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Unload an ACPI table
+ *
+ ******************************************************************************/
+
+acpi_status acpi_ex_unload_table(union acpi_operand_object *ddb_handle)
+{
+	acpi_status status = AE_OK;
+	union acpi_operand_object *table_desc = ddb_handle;
+	u32 table_index;
+
+	ACPI_FUNCTION_TRACE(ex_unload_table);
+
+	/*
+	 * Temporarily emit a warning so that the ASL for the machine can be
+	 * hopefully obtained. This is to say that the Unload() operator is
+	 * extremely rare if not completely unused.
+	 */
+	ACPI_WARNING((AE_INFO, "Received request to unload an ACPI table"));
+
+	/*
+	 * May 2018: Unload is no longer supported for the following reasons:
+	 * 1) A correct implementation on some hosts may not be possible.
+	 * 2) Other ACPI implementations do not correctly/fully support it.
+	 * 3) It requires host device driver support which does not exist.
+	 *    (To properly support namespace unload out from underneath.)
+	 * 4) This AML operator has never been seen in the field.
+	 */
+	ACPI_EXCEPTION((AE_INFO, AE_NOT_IMPLEMENTED,
+			"AML Unload operator is not supported"));
+
+	/*
+	 * Validate the handle
+	 * Although the handle is partially validated in acpi_ex_reconfiguration()
+	 * when it calls acpi_ex_resolve_operands(), the handle is more completely
+	 * validated here.
+	 *
+	 * Handle must be a valid operand object of type reference. Also, the
+	 * ddb_handle must still be marked valid (table has not been previously
+	 * unloaded)
+	 */
+	if ((!ddb_handle) ||
+	    (ACPI_GET_DESCRIPTOR_TYPE(ddb_handle) != ACPI_DESC_TYPE_OPERAND) ||
+	    (ddb_handle->common.type != ACPI_TYPE_LOCAL_REFERENCE) ||
+	    (!(ddb_handle->common.flags & AOPOBJ_DATA_VALID))) {
+		return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
+	}
+
+	/* Get the table index from the ddb_handle */
+
+	table_index = table_desc->reference.value;
+
+	/*
+	 * Release the interpreter lock so that the table lock won't have
+	 * strict order requirement against it.
+	 */
+	acpi_ex_exit_interpreter();
+	status = acpi_tb_unload_table(table_index);
+	acpi_ex_enter_interpreter();
+
+	/*
+	 * Invalidate the handle. We do this because the handle may be stored
+	 * in a named object and may not be actually deleted until much later.
+	 */
+	if (ACPI_SUCCESS(status)) {
+		ddb_handle->common.flags &= ~AOPOBJ_DATA_VALID;
+	}
+	return_ACPI_STATUS(status);
+}