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1// SPDX-License-Identifier: GPL-2.0-only2/* Copyright(c) 2023 Intel Corporation. All rights reserved. */3#include <linux/module.h>4#include <linux/dax.h>5 6#include "../cxl/cxl.h"7#include "bus.h"8 9static int cxl_dax_region_probe(struct device *dev)10{11 struct cxl_dax_region *cxlr_dax = to_cxl_dax_region(dev);12 int nid = phys_to_target_node(cxlr_dax->hpa_range.start);13 struct cxl_region *cxlr = cxlr_dax->cxlr;14 struct dax_region *dax_region;15 struct dev_dax_data data;16 17 if (nid == NUMA_NO_NODE)18 nid = memory_add_physaddr_to_nid(cxlr_dax->hpa_range.start);19 20 dax_region = alloc_dax_region(dev, cxlr->id, &cxlr_dax->hpa_range, nid,21 PMD_SIZE, IORESOURCE_DAX_KMEM);22 if (!dax_region)23 return -ENOMEM;24 25 data = (struct dev_dax_data) {26 .dax_region = dax_region,27 .id = -1,28 .size = range_len(&cxlr_dax->hpa_range),29 .memmap_on_memory = true,30 };31 32 return PTR_ERR_OR_ZERO(devm_create_dev_dax(&data));33}34 35static struct cxl_driver cxl_dax_region_driver = {36 .name = "cxl_dax_region",37 .probe = cxl_dax_region_probe,38 .id = CXL_DEVICE_DAX_REGION,39 .drv = {40 .suppress_bind_attrs = true,41 },42};43 44module_cxl_driver(cxl_dax_region_driver);45MODULE_ALIAS_CXL(CXL_DEVICE_DAX_REGION);46MODULE_DESCRIPTION("CXL DAX: direct access to CXL regions");47MODULE_LICENSE("GPL");48MODULE_AUTHOR("Intel Corporation");49MODULE_IMPORT_NS(CXL);50