1*09d09e04SDan Williams // SPDX-License-Identifier: GPL-2.0-only 2*09d09e04SDan Williams /* Copyright(c) 2023 Intel Corporation. All rights reserved. */ 3*09d09e04SDan Williams #include <linux/module.h> 4*09d09e04SDan Williams #include <linux/dax.h> 5*09d09e04SDan Williams 6*09d09e04SDan Williams #include "../cxl/cxl.h" 7*09d09e04SDan Williams #include "bus.h" 8*09d09e04SDan Williams 9*09d09e04SDan Williams static int cxl_dax_region_probe(struct device *dev) 10*09d09e04SDan Williams { 11*09d09e04SDan Williams struct cxl_dax_region *cxlr_dax = to_cxl_dax_region(dev); 12*09d09e04SDan Williams int nid = phys_to_target_node(cxlr_dax->hpa_range.start); 13*09d09e04SDan Williams struct cxl_region *cxlr = cxlr_dax->cxlr; 14*09d09e04SDan Williams struct dax_region *dax_region; 15*09d09e04SDan Williams struct dev_dax_data data; 16*09d09e04SDan Williams struct dev_dax *dev_dax; 17*09d09e04SDan Williams 18*09d09e04SDan Williams if (nid == NUMA_NO_NODE) 19*09d09e04SDan Williams nid = memory_add_physaddr_to_nid(cxlr_dax->hpa_range.start); 20*09d09e04SDan Williams 21*09d09e04SDan Williams dax_region = alloc_dax_region(dev, cxlr->id, &cxlr_dax->hpa_range, nid, 22*09d09e04SDan Williams PMD_SIZE, IORESOURCE_DAX_KMEM); 23*09d09e04SDan Williams if (!dax_region) 24*09d09e04SDan Williams return -ENOMEM; 25*09d09e04SDan Williams 26*09d09e04SDan Williams data = (struct dev_dax_data) { 27*09d09e04SDan Williams .dax_region = dax_region, 28*09d09e04SDan Williams .id = -1, 29*09d09e04SDan Williams .size = range_len(&cxlr_dax->hpa_range), 30*09d09e04SDan Williams }; 31*09d09e04SDan Williams dev_dax = devm_create_dev_dax(&data); 32*09d09e04SDan Williams if (IS_ERR(dev_dax)) 33*09d09e04SDan Williams return PTR_ERR(dev_dax); 34*09d09e04SDan Williams 35*09d09e04SDan Williams /* child dev_dax instances now own the lifetime of the dax_region */ 36*09d09e04SDan Williams dax_region_put(dax_region); 37*09d09e04SDan Williams return 0; 38*09d09e04SDan Williams } 39*09d09e04SDan Williams 40*09d09e04SDan Williams static struct cxl_driver cxl_dax_region_driver = { 41*09d09e04SDan Williams .name = "cxl_dax_region", 42*09d09e04SDan Williams .probe = cxl_dax_region_probe, 43*09d09e04SDan Williams .id = CXL_DEVICE_DAX_REGION, 44*09d09e04SDan Williams .drv = { 45*09d09e04SDan Williams .suppress_bind_attrs = true, 46*09d09e04SDan Williams }, 47*09d09e04SDan Williams }; 48*09d09e04SDan Williams 49*09d09e04SDan Williams module_cxl_driver(cxl_dax_region_driver); 50*09d09e04SDan Williams MODULE_ALIAS_CXL(CXL_DEVICE_DAX_REGION); 51*09d09e04SDan Williams MODULE_LICENSE("GPL"); 52*09d09e04SDan Williams MODULE_AUTHOR("Intel Corporation"); 53*09d09e04SDan Williams MODULE_IMPORT_NS(CXL); 54