This helper function will be help drivers ascertain whether they can use
64-bit memory accesses.
Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@xxxxxxx>
---
include/linux/device.h | 17 +++++++++++++++++
1 file changed, 17 insertions(+)
diff --git a/include/linux/device.h b/include/linux/device.h
index bd94aa0cbd72..e9b4b2f99a44 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -826,6 +826,23 @@ static inline int dev_num_vf(struct device *dev)
return 0;
}
+#if defined(CONFIG_ARCH_HAS_64BIT_MMIO_BROKEN)
+static inline bool dev_64bit_mmio_supported(struct device *dev)
+{
+ return !dev->mmio_64bit_broken;
+}
+#elif defined(CONFIG_64BIT)
+static inline bool dev_64bit_mmio_supported(struct device *dev)
+{
+ return true;
+}
+#else
+static inline bool dev_64bit_mmio_supported(struct device *dev)
+{
+ return false;
+}
+#endif
+
/*
* Root device objects for grouping under /sys/devices
*/
--
2.30.1
