From: Alejandro Lucero <redacted>

By definition a type2 cxl device will use the host managed memory for
specific functionality, therefore it should not be available to other
uses like DAX.

Signed-off-by: Alejandro Lucero <redacted>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Davidlohr Bueso <redacted>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Reviewed-by: Ben Cheatham <redacted>
---
 drivers/cxl/core/region.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/cxl/core/region.c b/drivers/cxl/core/region.c
index b3a6d08be461..6a89a1817199 100644
--- a/drivers/cxl/core/region.c
+++ b/drivers/cxl/core/region.c

@@ -4264,6 +4264,13 @@ static int cxl_region_probe(struct device *dev)
 	if (rc)
 		return rc;
 
+	/*
+	 * HDM-D[B] (device-memory) regions have accelerator specific usage.
+	 * Skip device-dax registration.
+	 */
+	if (cxlr->type == CXL_DECODER_DEVMEM)
+		return 0;
+
 	/*
 	 * From this point on any path that changes the region's state away from
 	 * CXL_CONFIG_COMMIT is also responsible for releasing the driver.

-- 
2.34.1