/* * Copyright(c) 2013-2015 Intel Corporation. All rights reserved. * * This program is free software; you can redistribute it and/or modify * it under the terms of version 2 of the GNU General Public License as * published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. */ #include <linux/vmalloc.h> #include <linux/module.h> #include <linux/device.h> #include <linux/sizes.h> #include <linux/ndctl.h> #include <linux/slab.h> #include <linux/mm.h> #include <linux/nd.h> #include "label.h" #include "nd.h" static int nvdimm_probe(struct device *dev) { struct nvdimm_drvdata *ndd; int rc; rc = nvdimm_check_config_data(dev); if (rc) { /* not required for non-aliased nvdimm, ex. NVDIMM-N */ if (rc == -ENOTTY) rc = 0; return rc; } /* reset locked, to be validated below... */ nvdimm_clear_locked(dev); ndd = kzalloc(sizeof(*ndd), GFP_KERNEL); if (!ndd) return -ENOMEM; dev_set_drvdata(dev, ndd); ndd->dpa.name = dev_name(dev); ndd->ns_current = -1; ndd->ns_next = -1; ndd->dpa.start = 0; ndd->dpa.end = -1; ndd->dev = dev; get_device(dev); kref_init(&ndd->kref); /* * EACCES failures reading the namespace label-area-properties * are interpreted as the DIMM capacity being locked but the * namespace labels themselves being accessible. */ rc = nvdimm_init_nsarea(ndd); if (rc == -EACCES) { /* * See nvdimm_namespace_common_probe() where we fail to * allow namespaces to probe while the DIMM is locked, * but we do allow for namespace enumeration. */ nvdimm_set_locked(dev); rc = 0; } if (rc) goto err; /* * EACCES failures reading the namespace label-data are * interpreted as the label area being locked in addition to the * DIMM capacity. We fail the dimm probe to prevent regions from * attempting to parse the label area. */ rc = nd_label_data_init(ndd); if (rc == -EACCES) nvdimm_set_locked(dev); if (rc) goto err; dev_dbg(dev, "config data size: %d\n", ndd->nsarea.config_size); nvdimm_bus_lock(dev); if (ndd->ns_current >= 0) { rc = nd_label_reserve_dpa(ndd); if (rc == 0) nvdimm_set_aliasing(dev); } nvdimm_bus_unlock(dev); if (rc) goto err; return 0; err: put_ndd(ndd); return rc; } static int nvdimm_remove(struct device *dev) { struct nvdimm_drvdata *ndd = dev_get_drvdata(dev); if (!ndd) return 0; nvdimm_bus_lock(dev); dev_set_drvdata(dev, NULL); nvdimm_bus_unlock(dev); put_ndd(ndd); return 0; } static struct nd_device_driver nvdimm_driver = { .probe = nvdimm_probe, .remove = nvdimm_remove, .drv = { .name = "nvdimm", }, .type = ND_DRIVER_DIMM, }; int __init nvdimm_init(void) { return nd_driver_register(&nvdimm_driver); } void nvdimm_exit(void) { driver_unregister(&nvdimm_driver.drv); } MODULE_ALIAS_ND_DEVICE(ND_DEVICE_DIMM);