Allow drivers/dma/idxd/registers.h to be included from userspace in
tools/ by adjusting the include path to uapi/linux/idxd.h if __KERNEL__
is not defined.

A subsequent commit will use registers.h to implement a userspace driver
for Intel DSA devices in tools/testing/selftests/vfio.

Acked-by: Vinicius Costa Gomes <vinicius.gomes@intel.com>
Acked-by: Shuah Khan <skhan@linuxfoundation.org>
Signed-off-by: David Matlack <dmatlack@google.com>
---
 drivers/dma/idxd/registers.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/dma/idxd/registers.h b/drivers/dma/idxd/registers.h
index 9c1c546fe443..02bab136385e 100644
--- a/drivers/dma/idxd/registers.h
+++ b/drivers/dma/idxd/registers.h
@@ -3,7 +3,11 @@
 #ifndef _IDXD_REGISTERS_H_
 #define _IDXD_REGISTERS_H_
 
+#ifdef __KERNEL__
 #include <uapi/linux/idxd.h>
+#else
+#include <linux/idxd.h>
+#endif
 
 /* PCI Config */
 #define PCI_DEVICE_ID_INTEL_DSA_GNRD	0x11fb
-- 
2.51.0.rc2.233.g662b1ed5c5-goog