1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 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 9 static 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 struct dev_dax *dev_dax; 17 18 if (nid == NUMA_NO_NODE) 19 nid = memory_add_physaddr_to_nid(cxlr_dax->hpa_range.start); 20 21 dax_region = alloc_dax_region(dev, cxlr->id, &cxlr_dax->hpa_range, nid, 22 PMD_SIZE, IORESOURCE_DAX_KMEM); 23 if (!dax_region) 24 return -ENOMEM; 25 26 data = (struct dev_dax_data) { 27 .dax_region = dax_region, 28 .id = -1, 29 .size = range_len(&cxlr_dax->hpa_range), 30 }; 31 dev_dax = devm_create_dev_dax(&data); 32 if (IS_ERR(dev_dax)) 33 return PTR_ERR(dev_dax); 34 35 /* child dev_dax instances now own the lifetime of the dax_region */ 36 dax_region_put(dax_region); 37 return 0; 38 } 39 40 static struct cxl_driver cxl_dax_region_driver = { 41 .name = "cxl_dax_region", 42 .probe = cxl_dax_region_probe, 43 .id = CXL_DEVICE_DAX_REGION, 44 .drv = { 45 .suppress_bind_attrs = true, 46 }, 47 }; 48 49 module_cxl_driver(cxl_dax_region_driver); 50 MODULE_ALIAS_CXL(CXL_DEVICE_DAX_REGION); 51 MODULE_LICENSE("GPL"); 52 MODULE_AUTHOR("Intel Corporation"); 53 MODULE_IMPORT_NS(CXL); 54