linux-imx

/*

 * 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.

 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/moduleparam.h>

#include <linux/vmalloc.h>

#include <linux/device.h>

#include <linux/ndctl.h>

#include <linux/slab.h>

#include <linux/io.h>

#include <linux/fs.h>

#include <linux/mm.h>

#include "nd-core.h"

#include "label.h"

#include "pmem.h"

#include "nd.h"

​

static DEFINE_IDA(dimm_ida);

​

static bool noblk;

module_param(noblk, bool, 0444);

MODULE_PARM_DESC(noblk, "force disable BLK / local alias support");

​

/*

 * Retrieve bus and dimm handle and return if this bus supports

 * get_config_data commands

 */

int nvdimm_check_config_data(struct device *dev)

{

    struct nvdimm *nvdimm = to_nvdimm(dev);

​

    if (!nvdimm->cmd_mask ||

        !test_bit(ND_CMD_GET_CONFIG_DATA, &nvdimm->cmd_mask)) {

        if (test_bit(NDD_ALIASING, &nvdimm->flags))

            return -ENXIO;

        else

            return -ENOTTY;

    }

​

    return 0;

}

​

static int validate_dimm(struct nvdimm_drvdata *ndd)

{

    int rc;

​

    if (!ndd)

        return -EINVAL;

​

    rc = nvdimm_check_config_data(ndd->dev);

    if (rc)

        dev_dbg(ndd->dev, "%pf: %s error: %d\n",

                __builtin_return_address(0), __func__, rc);

    return rc;

}

​

/**

 * nvdimm_init_nsarea - determine the geometry of a dimm's namespace area

 * @nvdimm: dimm to initialize

 */

int nvdimm_init_nsarea(struct nvdimm_drvdata *ndd)

{

    struct nd_cmd_get_config_size *cmd = &ndd->nsarea;

    struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(ndd->dev);

    struct nvdimm_bus_descriptor *nd_desc;

    int rc = validate_dimm(ndd);

    int cmd_rc = 0;

​

    if (rc)

        return rc;

​

    if (cmd->config_size)

        return 0; /* already valid */

​

    memset(cmd, 0, sizeof(*cmd));

    nd_desc = nvdimm_bus->nd_desc;

    rc = nd_desc->ndctl(nd_desc, to_nvdimm(ndd->dev),

            ND_CMD_GET_CONFIG_SIZE, cmd, sizeof(*cmd), &cmd_rc);

    if (rc < 0)

        return rc;

    return cmd_rc;

}

​