[PATCH 1/3] ACPI: utils: introduce acpi_get_local_u64_address()

[Pierre-Louis Bossart]

The ACPI _ADR is a 64-bit value. We changed the definitions in commit
ca6f998cf9a2 ("ACPI: bus: change _ADR representation to 64 bits") but
some helpers still assume the value is a 32-bit value.

This patch adds a new helper to extract the full 64-bits. The existing
32-bit helper is kept for backwards-compatibility and cases where the
_ADR is known to fit in a 32-bit value.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@xxxxxxxxxxxxxxx>
Reviewed-by: Péter Ujfalusi <peter.ujfalusi@xxxxxxxxxxxxxxx>
Reviewed-by: Bard Liao <yung-chuan.liao@xxxxxxxxxxxxxxx>
---
 drivers/acpi/utils.c | 22 ++++++++++++++++------
 include/linux/acpi.h |  1 +
 2 files changed, 17 insertions(+), 6 deletions(-)

diff --git a/drivers/acpi/utils.c b/drivers/acpi/utils.c
index 202234ba54bd..ae9384282273 100644
--- a/drivers/acpi/utils.c
+++ b/drivers/acpi/utils.c
@@ -277,15 +277,25 @@ acpi_evaluate_integer(acpi_handle handle,
 
 EXPORT_SYMBOL(acpi_evaluate_integer);
 
+int acpi_get_local_u64_address(acpi_handle handle, u64 *addr)
+{
+	acpi_status status;
+
+	status = acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL, addr);
+	if (ACPI_FAILURE(status))
+		return -ENODATA;
+	return 0;
+}
+EXPORT_SYMBOL(acpi_get_local_u64_address);
+
 int acpi_get_local_address(acpi_handle handle, u32 *addr)
 {
-	unsigned long long adr;
-	acpi_status status;
-
-	status = acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL, &adr);
-	if (ACPI_FAILURE(status))
-		return -ENODATA;
+	u64 adr;
+	int ret;
 
+	ret = acpi_get_local_u64_address(handle, &adr);
+	if (ret < 0)
+		return ret;
 	*addr = (u32)adr;
 	return 0;
 }
diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index 28c3fb2bef0d..65e7177bcb02 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -761,6 +761,7 @@ static inline u64 acpi_arch_get_root_pointer(void)
 }
 #endif
 
+int acpi_get_local_u64_address(acpi_handle handle, u64 *addr);
 int acpi_get_local_address(acpi_handle handle, u32 *addr);
 const char *acpi_get_subsystem_id(acpi_handle handle);
 
-- 
2.43.0