1 // SPDX-License-Identifier: GPL-2.0 2 #include <linux/platform_device.h> 3 #include <linux/memregion.h> 4 #include <linux/module.h> 5 #include <linux/pfn_t.h> 6 #include "../bus.h" 7 8 static int dax_hmem_probe(struct platform_device *pdev) 9 { 10 struct device *dev = &pdev->dev; 11 struct dax_region *dax_region; 12 struct memregion_info *mri; 13 struct dev_dax_data data; 14 struct dev_dax *dev_dax; 15 struct resource *res; 16 struct range range; 17 18 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 19 if (!res) 20 return -ENOMEM; 21 22 mri = dev->platform_data; 23 range.start = res->start; 24 range.end = res->end; 25 dax_region = alloc_dax_region(dev, pdev->id, &range, mri->target_node, 26 PMD_SIZE, 0); 27 if (!dax_region) 28 return -ENOMEM; 29 30 data = (struct dev_dax_data) { 31 .dax_region = dax_region, 32 .id = -1, 33 .size = resource_size(res), 34 }; 35 dev_dax = devm_create_dev_dax(&data); 36 if (IS_ERR(dev_dax)) 37 return PTR_ERR(dev_dax); 38 39 /* child dev_dax instances now own the lifetime of the dax_region */ 40 dax_region_put(dax_region); 41 return 0; 42 } 43 44 static int dax_hmem_remove(struct platform_device *pdev) 45 { 46 /* devm handles teardown */ 47 return 0; 48 } 49 50 static struct platform_driver dax_hmem_driver = { 51 .probe = dax_hmem_probe, 52 .remove = dax_hmem_remove, 53 .driver = { 54 .name = "hmem", 55 }, 56 }; 57 58 module_platform_driver(dax_hmem_driver); 59 60 MODULE_ALIAS("platform:hmem*"); 61 MODULE_LICENSE("GPL v2"); 62 MODULE_AUTHOR("Intel Corporation"); 63