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.

 */

#include <linux/device.h>

#include <linux/ndctl.h>

#include <linux/uuid.h>

#include <linux/slab.h>

#include <linux/io.h>

#include <linux/nd.h>

#include "nd-core.h"

#include "label.h"

#include "nd.h"

​

static guid_t nvdimm_btt_guid;

static guid_t nvdimm_btt2_guid;

static guid_t nvdimm_pfn_guid;

static guid_t nvdimm_dax_guid;

​

static u32 best_seq(u32 a, u32 b)

{

    a &= NSINDEX_SEQ_MASK;

    b &= NSINDEX_SEQ_MASK;

​

    if (a == 0 || a == b)

        return b;

    else if (b == 0)

        return a;

    else if (nd_inc_seq(a) == b)

        return b;

    else

        return a;

}

​

unsigned sizeof_namespace_label(struct nvdimm_drvdata *ndd)

{

    return ndd->nslabel_size;

}

​

static size_t __sizeof_namespace_index(u32 nslot)

{

    return ALIGN(sizeof(struct nd_namespace_index) + DIV_ROUND_UP(nslot, 8),

            NSINDEX_ALIGN);

}

​

static int __nvdimm_num_label_slots(struct nvdimm_drvdata *ndd,

        size_t index_size)

{

    return (ndd->nsarea.config_size - index_size * 2) /

            sizeof_namespace_label(ndd);

}

​

int nvdimm_num_label_slots(struct nvdimm_drvdata *ndd)

{

    u32 tmp_nslot, n;

​

    tmp_nslot = ndd->nsarea.config_size / sizeof_namespace_label(ndd);

    n = __sizeof_namespace_index(tmp_nslot) / NSINDEX_ALIGN;

​

    return __nvdimm_num_label_slots(ndd, NSINDEX_ALIGN * n);

}

​

size_t sizeof_namespace_index(struct nvdimm_drvdata *ndd)

{

    u32 nslot, space, size;

​

    /*

     * Per UEFI 2.7, the minimum size of the Label Storage Area is large

     * enough to hold 2 index blocks and 2 labels.  The minimum index

     * block size is 256 bytes. The label size is 128 for namespaces

     * prior to version 1.2 and at minimum 256 for version 1.2 and later.

     */

    nslot = nvdimm_num_label_slots(ndd);

    space = ndd->nsarea.config_size - nslot * sizeof_namespace_label(ndd);

    size = __sizeof_namespace_index(nslot) * 2;

    if (size <= space && nslot >= 2)

        return size / 2;

​

    dev_err(ndd->dev, "label area (%d) too small to host (%d byte) labels\n",

            ndd->nsarea.config_size, sizeof_namespace_label(ndd));

    return 0;

}

​

static int __nd_label_validate(struct nvdimm_drvdata *ndd)