// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
 */
#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_security_setup_events(dev);
        if (rc < 0) {
                dev_err(dev, "security event setup failed: %d\n", rc);
                return 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_obj(*ndd);
        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_labeling(dev);
        }
        nvdimm_bus_unlock(dev);

        if (rc)
                goto err;

        return 0;

 err:
        put_ndd(ndd);
        return rc;
}

static void nvdimm_remove(struct device *dev)
{
        struct nvdimm_drvdata *ndd = dev_get_drvdata(dev);

        scoped_guard(nvdimm_bus, dev)
                dev_set_drvdata(dev, NULL);
        put_ndd(ndd);
}

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);