ACPICA: Add subsystem option to force copy of DSDT to local memory

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.

https://bugzilla.kernel.org/show_bug.cgi?id=14679Signed-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>

drivers/acpi/acpica/acglobal.h

@@ -117,6 +117,14 @@ u8 ACPI_INIT_GLOBAL(acpi_gbl_use_default_register_widths, TRUE);
  */
 u8 ACPI_INIT_GLOBAL(acpi_gbl_enable_aml_debug_object, FALSE);
 
+/*
+ * 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.
+ */
+u8 ACPI_INIT_GLOBAL(acpi_gbl_copy_dsdt_locally, FALSE);
+
 /* acpi_gbl_FADT is a local copy of the FADT, converted to a common format. */
 
 struct acpi_table_fadt acpi_gbl_FADT;

drivers/acpi/acpica/actables.h

@@ -109,6 +109,8 @@ acpi_tb_verify_checksum(struct acpi_table_header *table, u32 length);
 
 void acpi_tb_check_dsdt_header(void);
 
+void acpi_tb_copy_dsdt(struct acpi_table_desc *table_desc);
+
 void
 acpi_tb_install_table(acpi_physical_address address,
 		      char *signature, u32 table_index);

drivers/acpi/acpica/psxface.c

@@ -46,6 +46,7 @@
 #include "acparser.h"
 #include "acdispat.h"
 #include "acinterp.h"
+#include "actables.h"
 #include "amlcode.h"
 
 #define _COMPONENT          ACPI_PARSER

drivers/acpi/acpica/tbutils.c

@@ -385,6 +385,41 @@ void acpi_tb_check_dsdt_header(void)
 	}
 }
 
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_tb_copy_dsdt
+ *
+ * PARAMETERS:  table_desc          - Installed table to copy
+ *
+ * RETURN:      None
+ *
+ * DESCRIPTION: Implements a subsystem option to copy the DSDT to local memory.
+ *              Some very bad BIOSs are known to either corrupt the DSDT or
+ *              install a new, bad DSDT. This copy works around the problem.
+ *
+ ******************************************************************************/
+
+void acpi_tb_copy_dsdt(struct acpi_table_desc *table_desc)
+{
+	struct acpi_table_header *new_table;
+
+	new_table = ACPI_ALLOCATE(table_desc->length);
+	if (!new_table) {
+		ACPI_ERROR((AE_INFO, "Could not copy DSDT of length 0x%X",
+			    table_desc->length));
+		return;
+	}
+
+	ACPI_MEMCPY(new_table, table_desc->pointer, table_desc->length);
+	acpi_tb_delete_table(table_desc);
+	table_desc->pointer = new_table;
+	table_desc->flags = ACPI_TABLE_ORIGIN_ALLOCATED;
+
+	ACPI_INFO((AE_INFO,
+		   "Forced DSDT copy: length 0x%05X copied locally, original unmapped",
+		   new_table->length));
+}
+
 /*******************************************************************************
  *
  * FUNCTION:    acpi_tb_install_table

drivers/acpi/acpica/tbxface.c

@@ -531,6 +531,16 @@ static acpi_status acpi_tb_load_namespace(void)
 		goto unlock_and_exit;
 	}
 
+	/*
+	 * 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) {
+		acpi_tb_copy_dsdt(acpi_gbl_DSDT);
+	}
+
 	/*
 	 * Save the original DSDT header for detection of table corruption
 	 * and/or replacement of the DSDT from outside the OS.

include/acpi/acpixf.h

@@ -68,6 +68,7 @@ extern u8 acpi_gbl_use_default_register_widths;
 extern acpi_name acpi_gbl_trace_method_name;
 extern u32 acpi_gbl_trace_flags;
 extern u8 acpi_gbl_enable_aml_debug_object;
+extern u8 acpi_gbl_copy_dsdt_locally;
 
 extern u32 acpi_current_gpe_count;
 extern struct acpi_table_fadt acpi_gbl_FADT;