// SPDX-License-Identifier: GPL-2.0 #include <linux/platform_device.h> #include <linux/memregion.h> #include <linux/module.h> #include <linux/pfn_t.h> #include "../bus.h" static bool region_idle; module_param_named(region_idle, region_idle, bool, 0644); static int dax_hmem_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; struct dax_region *dax_region; struct memregion_info *mri; struct dev_dax_data data; struct dev_dax *dev_dax; struct resource *res; struct range range; res = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (!res) return -ENOMEM; mri = dev->platform_data; range.start = res->start; range.end = res->end; dax_region = alloc_dax_region(dev, pdev->id, &range, mri->target_node, PMD_SIZE, 0); if (!dax_region) return -ENOMEM; data = (struct dev_dax_data) { .dax_region = dax_region, .id = -1, .size = region_idle ? 0 : resource_size(res), }; 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 int dax_hmem_remove(struct platform_device *pdev) { /* devm handles teardown */ return 0; } static struct platform_driver dax_hmem_driver = { .probe = dax_hmem_probe, .remove = dax_hmem_remove, .driver = { .name = "hmem", }, }; module_platform_driver(dax_hmem_driver); MODULE_ALIAS("platform:hmem*"); MODULE_LICENSE("GPL v2"); MODULE_AUTHOR("Intel Corporation");