Eric Lee / smarc-fsl-linux-kernel

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drivers/nvdimm/dimm.c 2.45 KB
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81f7e3824   Eric Lee   Initial Release, ... 
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  /*
   * 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;
  	}
  
  	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);
  
  	rc = nvdimm_init_nsarea(ndd);
  	if (rc == -EACCES)
  		nvdimm_set_locked(dev);
  	if (rc)
  		goto err;
  
  	rc = nvdimm_init_config_data(ndd);
  	if (rc)
  		goto err;
  
  	dev_dbg(dev, "config data size: %d
  ", ndd->nsarea.config_size);
  
  	nvdimm_bus_lock(dev);
  	ndd->ns_current = nd_label_validate(ndd);
  	ndd->ns_next = nd_label_next_nsindex(ndd->ns_current);
  	nd_label_copy(ndd, to_next_namespace_index(ndd),
  			to_current_namespace_index(ndd));
  	if (ndd->ns_current >= 0) {
  		rc = nd_label_reserve_dpa(ndd);
  		if (rc == 0)
  			nvdimm_set_aliasing(dev);
  	}
  	nvdimm_clear_locked(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);