ACPICA: add debug dump of BIOS _OSI strings

on boot, print out the OSI strings the BIOS uses to query the OS.

To see this output...

build with CONFIG_ACPI_DEBUG

boot with
"acpi.debug_level=4" (ACPI_LV_INFO) (enabled by default)
and
"acpi.debug_level=1" (ACPI_UTILITIES) (default is 0)

example output:

ACPI: BIOS _OSI(Windows 2001) supported
ACPI: BIOS _OSI(Windows 2001 SP1) supported
ACPI: BIOS _OSI(Windows 2001 SP2) supported
ACPI: BIOS _OSI(Windows 2006) supported
ACPI: BIOS _OSI(Linux) not-supported
ACPI: BIOS _OSI(FreeBSD) not-supported

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

diff --git a/drivers/acpi/acpica/uteval.c b/drivers/acpi/acpica/uteval.c
index da9450bc60f7062e05f0f0ba385572525e5a4f23..9c9897dbe9071ae83d56b994b1f3c03de1ab2e91 100644 (file)
--- a/drivers/acpi/acpica/uteval.c
+++ b/drivers/acpi/acpica/uteval.c
@@ -116,9 +116,9 @@ acpi_status acpi_ut_osi_implementation(struct acpi_walk_state *walk_state)
                return_ACPI_STATUS(AE_NO_MEMORY);
        }
 
-       /* Default return value is SUPPORTED */
+       /* Default return value is 0, NOT-SUPPORTED */
 
-       return_desc->integer.value = ACPI_UINT32_MAX;
+       return_desc->integer.value = 0;
        walk_state->return_desc = return_desc;
 
        /* Compare input string to static table of supported interfaces */
@@ -127,10 +127,8 @@ acpi_status acpi_ut_osi_implementation(struct acpi_walk_state *walk_state)
                if (!ACPI_STRCMP
                    (string_desc->string.pointer,
                     acpi_interfaces_supported[i])) {
-
-                       /* The interface is supported */
-
-                       return_ACPI_STATUS(AE_OK);
+                       return_desc->integer.value = ACPI_UINT32_MAX;
+                       goto done;
                }
        }
 
@@ -141,15 +139,14 @@ acpi_status acpi_ut_osi_implementation(struct acpi_walk_state *walk_state)
         */
        status = acpi_os_validate_interface(string_desc->string.pointer);
        if (ACPI_SUCCESS(status)) {
-
-               /* The interface is supported */
-
-               return_ACPI_STATUS(AE_OK);
+               return_desc->integer.value = ACPI_UINT32_MAX;
        }
 
-       /* The interface is not supported */
+done:
+       ACPI_DEBUG_PRINT_RAW((ACPI_DB_INFO, "ACPI: BIOS _OSI(%s) %ssupported\n",
+               string_desc->string.pointer,
+               return_desc->integer.value == 0 ? "not-" : ""));
 
-       return_desc->integer.value = 0;
        return_ACPI_STATUS(AE_OK);
 }