// SPDX-License-Identifier: GPL-2.0-only /* * Copyright(c) 2013-2016 Intel Corporation. All rights reserved. */ #include <linux/device.h> #include <linux/sizes.h> #include <linux/slab.h> #include <linux/mm.h> #include "nd-core.h" #include "pfn.h" #include "nd.h" static void nd_dax_release(struct device *dev) { struct nd_region *nd_region = to_nd_region(dev->parent); struct nd_dax *nd_dax = to_nd_dax(dev); struct nd_pfn *nd_pfn = &nd_dax->nd_pfn; dev_dbg(dev, "trace\n"); nd_detach_ndns(dev, &nd_pfn->ndns); ida_simple_remove(&nd_region->dax_ida, nd_pfn->id); kfree(nd_pfn->uuid); kfree(nd_dax); } struct nd_dax *to_nd_dax(struct device *dev) { struct nd_dax *nd_dax = container_of(dev, struct nd_dax, nd_pfn.dev); WARN_ON(!is_nd_dax(dev)); return nd_dax; } EXPORT_SYMBOL(to_nd_dax); static const struct device_type nd_dax_device_type = { .name = "nd_dax", .release = nd_dax_release, .groups = nd_pfn_attribute_groups, }; bool is_nd_dax(struct device *dev) { return dev ? dev->type == &nd_dax_device_type : false; } EXPORT_SYMBOL(is_nd_dax); static struct nd_dax *nd_dax_alloc(struct nd_region *nd_region) { struct nd_pfn *nd_pfn; struct nd_dax *nd_dax; struct device *dev; nd_dax = kzalloc(sizeof(*nd_dax), GFP_KERNEL); if (!nd_dax) return NULL; nd_pfn = &nd_dax->nd_pfn; nd_pfn->id = ida_simple_get(&nd_region->dax_ida, 0, 0, GFP_KERNEL); if (nd_pfn->id < 0) { kfree(nd_dax); return NULL; } dev = &nd_pfn->dev; dev_set_name(dev, "dax%d.%d", nd_region->id, nd_pfn->id); dev->type = &nd_dax_device_type; dev->parent = &nd_region->dev; return nd_dax; } struct device *nd_dax_create(struct nd_region *nd_region) { struct device *dev = NULL; struct nd_dax *nd_dax; if (!is_memory(&nd_region->dev)) return NULL; nd_dax = nd_dax_alloc(nd_region); if (nd_dax) dev = nd_pfn_devinit(&nd_dax->nd_pfn, NULL); __nd_device_register(dev); return dev; } int nd_dax_probe(struct device *dev, struct nd_namespace_common *ndns) { int rc; struct nd_dax *nd_dax; struct device *dax_dev; struct nd_pfn *nd_pfn; struct nd_pfn_sb *pfn_sb; struct nd_region *nd_region = to_nd_region(ndns->dev.parent); if (ndns->force_raw) return -ENODEV; switch (ndns->claim_class) { case NVDIMM_CCLASS_NONE: case NVDIMM_CCLASS_DAX: break; default: return -ENODEV; } nvdimm_bus_lock(&ndns->dev); nd_dax = nd_dax_alloc(nd_region); nd_pfn = &nd_dax->nd_pfn; dax_dev = nd_pfn_devinit(nd_pfn, ndns); nvdimm_bus_unlock(&ndns->dev); if (!dax_dev) return -ENOMEM; pfn_sb = devm_kmalloc(dev, sizeof(*pfn_sb), GFP_KERNEL); nd_pfn->pfn_sb = pfn_sb; rc = nd_pfn_validate(nd_pfn, DAX_SIG); dev_dbg(dev, "dax: %s\n", rc == 0 ? dev_name(dax_dev) : "<none>"); if (rc < 0) { nd_detach_ndns(dax_dev, &nd_pfn->ndns); put_device(dax_dev); } else __nd_device_register(dax_dev); return rc; } EXPORT_SYMBOL(nd_dax_probe);