ACPI: Disable _GTS and _BFS support by default

Executing BIOS code paths not exercised by Windows
tends to get Linux into trouble.

However, if a system does benefit from _GTS or _BFS,
acpi.gts=1 an acpi.bfs=1 are now available to enable them.

http://bugzilla.kernel.org/show_bug.cgi?id=13041

Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 27 insertions, 0 deletions

diff --git a/drivers/acpi/sleep.c b/drivers/acpi/sleep.c
index 779e4e500df..9042875ac94 100644
--- a/drivers/acpi/sleep.c
+++ b/drivers/acpi/sleep.c
@@ -713,6 +713,32 @@ static void acpi_power_off(void)
         acpi_enter_sleep_state(ACPI_STATE_S5);
 }
 
+/*
+ * ACPI 2.0 created the optional _GTS and _BFS,
+ * but industry adoption has been neither rapid nor broad.
+ *
+ * Linux gets into trouble when it executes poorly validated
+ * paths through the BIOS, so disable _GTS and _BFS by default,
+ * but do speak up and offer the option to enable them.
+ */
+void __init acpi_gts_bfs_check(void)
+{
+        acpi_handle dummy;
+
+        if (ACPI_SUCCESS(acpi_get_handle(ACPI_ROOT_OBJECT, METHOD_NAME__GTS, &dummy)))
+        {
+                printk(KERN_NOTICE PREFIX "BIOS offers _GTS\n");
+                printk(KERN_NOTICE PREFIX "If \"acpi.gts=1\" improves suspend, "
+                        "please notify linux-acpi@vger.kernel.org\n");
+        }
+        if (ACPI_SUCCESS(acpi_get_handle(ACPI_ROOT_OBJECT, METHOD_NAME__BFS, &dummy)))
+        {
+                printk(KERN_NOTICE PREFIX "BIOS offers _BFS\n");
+                printk(KERN_NOTICE PREFIX "If \"acpi.bfs=1\" improves resume, "
+                        "please notify linux-acpi@vger.kernel.org\n");
+        }
+}
+
 int __init acpi_sleep_init(void)
 {
         acpi_status status;
@@ -771,5 +797,6 @@ int __init acpi_sleep_init(void)
          * object can also be evaluated when the system enters S5.
          */
         register_reboot_notifier(&tts_notifier);
+        acpi_gts_bfs_check();
         return 0;
 }