1 files changed, 53 insertions, 0 deletions
diff --git a/drivers/dax/cxl.c b/drivers/dax/cxl.c
new file mode 100644
index 000000000000..ccdf8de85bd5
--- /dev/null
+++ b/drivers/dax/cxl.c
@@ -0,0 +1,53 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/* Copyright(c) 2023 Intel Corporation. All rights reserved. */
+#include <linux/module.h>
+#include <linux/dax.h>
+
+#include "../cxl/cxl.h"
+#include "bus.h"
+
+static int cxl_dax_region_probe(struct device *dev)
+{
+	struct cxl_dax_region *cxlr_dax = to_cxl_dax_region(dev);
+	int nid = phys_to_target_node(cxlr_dax->hpa_range.start);
+	struct cxl_region *cxlr = cxlr_dax->cxlr;
+	struct dax_region *dax_region;
+	struct dev_dax_data data;
+	struct dev_dax *dev_dax;
+
+	if (nid == NUMA_NO_NODE)
+		nid = memory_add_physaddr_to_nid(cxlr_dax->hpa_range.start);
+
+	dax_region = alloc_dax_region(dev, cxlr->id, &cxlr_dax->hpa_range, nid,
+				      PMD_SIZE, IORESOURCE_DAX_KMEM);
+	if (!dax_region)
+		return -ENOMEM;
+
+	data = (struct dev_dax_data) {
+		.dax_region = dax_region,
+		.id = -1,
+		.size = range_len(&cxlr_dax->hpa_range),
+	};
+	dev_dax = devm_create_dev_dax(&data);
+	if (IS_ERR(dev_dax))
+		return PTR_ERR(dev_dax);
+
+	/* child dev_dax instances now own the lifetime of the dax_region */
+	dax_region_put(dax_region);
+	return 0;
+}
+
+static struct cxl_driver cxl_dax_region_driver = {
+	.name = "cxl_dax_region",
+	.probe = cxl_dax_region_probe,
+	.id = CXL_DEVICE_DAX_REGION,
+	.drv = {
+		.suppress_bind_attrs = true,
+	},
+};
+
+module_cxl_driver(cxl_dax_region_driver);
+MODULE_ALIAS_CXL(CXL_DEVICE_DAX_REGION);
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Intel Corporation");
+MODULE_IMPORT_NS(CXL);