linux/drivers/nvdimm/dimm.c
Dan Williams 42237e393f libnvdimm: allow a platform to force enable label support
Platforms like QEMU-KVM implement an NFIT table and label DSMs.
However, since that environment does not define an aliased
configuration, the labels are currently ignored and the kernel registers
a single full-sized pmem-namespace per region. Now that the kernel
supports sub-divisions of pmem regions the labels have a purpose.
Arrange for the labels to be honored when we find an existing / valid
namespace index block.

Cc: <qemu-devel@nongnu.org>
Cc: Haozhong Zhang <haozhong.zhang@intel.com>
Cc: Xiao Guangrong <guangrong.xiao@linux.intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2016-10-19 08:57:33 -07:00

116 lines
2.4 KiB
C

/*
* 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)
goto err;
rc = nvdimm_init_config_data(ndd);
if (rc)
goto err;
dev_dbg(dev, "config data size: %d\n", 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));
rc = nd_label_reserve_dpa(ndd);
if (ndd->ns_current >= 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);