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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;
}
/*
* The locked status bit reflects explicit status codes from the
* label reading commands, revalidate it each time the driver is
* activated and re-reads the label area.
*/
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);
/*
* Attempt to unlock, if the DIMM supports security commands,
* otherwise the locked indication is determined by explicit
* status codes from the label reading commands.
*/
rc = nvdimm_security_unlock(dev);
if (rc < 0)
dev_dbg(dev, "failed to unlock dimm: %d\n", rc);
/*
* 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);
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