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Release 4.14 drivers/nvdimm/region.c

Directory: drivers/nvdimm
/*
 * 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/cpumask.h>
#include <linux/module.h>
#include <linux/device.h>
#include <linux/nd.h>
#include "nd-core.h"
#include "nd.h"


static int nd_region_probe(struct device *dev) { int err, rc; static unsigned long once; struct nd_region_data *ndrd; struct nd_region *nd_region = to_nd_region(dev); if (nd_region->num_lanes > num_online_cpus() && nd_region->num_lanes < num_possible_cpus() && !test_and_set_bit(0, &once)) { dev_info(dev, "online cpus (%d) < concurrent i/o lanes (%d) < possible cpus (%d)\n", num_online_cpus(), nd_region->num_lanes, num_possible_cpus()); dev_info(dev, "setting nr_cpus=%d may yield better libnvdimm device performance\n", nd_region->num_lanes); } rc = nd_region_activate(nd_region); if (rc) return rc; rc = nd_blk_region_init(nd_region); if (rc) return rc; rc = nd_region_register_namespaces(nd_region, &err); if (rc < 0) return rc; ndrd = dev_get_drvdata(dev); ndrd->ns_active = rc; ndrd->ns_count = rc + err; if (rc && err && rc == err) return -ENODEV; if (is_nd_pmem(&nd_region->dev)) { struct resource ndr_res; if (devm_init_badblocks(dev, &nd_region->bb)) return -ENODEV; nd_region->bb_state = sysfs_get_dirent(nd_region->dev.kobj.sd, "badblocks"); if (!nd_region->bb_state) dev_warn(&nd_region->dev, "'badblocks' notification disabled\n"); ndr_res.start = nd_region->ndr_start; ndr_res.end = nd_region->ndr_start + nd_region->ndr_size - 1; nvdimm_badblocks_populate(nd_region, &nd_region->bb, &ndr_res); } nd_region->btt_seed = nd_btt_create(nd_region); nd_region->pfn_seed = nd_pfn_create(nd_region); nd_region->dax_seed = nd_dax_create(nd_region); if (err == 0) return 0; /* * Given multiple namespaces per region, we do not want to * disable all the successfully registered peer namespaces upon * a single registration failure. If userspace is missing a * namespace that it expects it can disable/re-enable the region * to retry discovery after correcting the failure. * <regionX>/namespaces returns the current * "<async-registered>/<total>" namespace count. */ dev_err(dev, "failed to register %d namespace%s, continuing...\n", err, err == 1 ? "" : "s"); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Dan J Williams15346.22%660.00%
Dave Jiang6720.24%110.00%
Vishal Verma6018.13%110.00%
Toshi Kani329.67%110.00%
Ross Zwisler195.74%110.00%
Total331100.00%10100.00%


static int child_unregister(struct device *dev, void *data) { nd_device_unregister(dev, ND_SYNC); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Dan J Williams25100.00%1100.00%
Total25100.00%1100.00%


static int nd_region_remove(struct device *dev) { struct nd_region *nd_region = to_nd_region(dev); device_for_each_child(dev, NULL, child_unregister); /* flush attribute readers and disable */ nvdimm_bus_lock(dev); nd_region->ns_seed = NULL; nd_region->btt_seed = NULL; nd_region->pfn_seed = NULL; nd_region->dax_seed = NULL; dev_set_drvdata(dev, NULL); nvdimm_bus_unlock(dev); /* * Note, this assumes device_lock() context to not race * nd_region_notify() */ sysfs_put(nd_region->bb_state); nd_region->bb_state = NULL; return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Dan J Williams89100.00%7100.00%
Total89100.00%7100.00%


static int child_notify(struct device *dev, void *data) { nd_device_notify(dev, *(enum nvdimm_event *) data); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Dan J Williams31100.00%1100.00%
Total31100.00%1100.00%


static void nd_region_notify(struct device *dev, enum nvdimm_event event) { if (event == NVDIMM_REVALIDATE_POISON) { struct nd_region *nd_region = to_nd_region(dev); struct resource res; if (is_nd_pmem(&nd_region->dev)) { res.start = nd_region->ndr_start; res.end = nd_region->ndr_start + nd_region->ndr_size - 1; nvdimm_badblocks_populate(nd_region, &nd_region->bb, &res); if (nd_region->bb_state) sysfs_notify_dirent(nd_region->bb_state); } } device_for_each_child(dev, &event, child_notify); }

Contributors

PersonTokensPropCommitsCommitProp
Dave Jiang6964.49%133.33%
Dan J Williams2523.36%133.33%
Toshi Kani1312.15%133.33%
Total107100.00%3100.00%

static struct nd_device_driver nd_region_driver = { .probe = nd_region_probe, .remove = nd_region_remove, .notify = nd_region_notify, .drv = { .name = "nd_region", }, .type = ND_DRIVER_REGION_BLK | ND_DRIVER_REGION_PMEM, };
int __init nd_region_init(void) { return nd_driver_register(&nd_region_driver); }

Contributors

PersonTokensPropCommitsCommitProp
Dan J Williams15100.00%1100.00%
Total15100.00%1100.00%


void nd_region_exit(void) { driver_unregister(&nd_region_driver.drv); }

Contributors

PersonTokensPropCommitsCommitProp
Dan J Williams15100.00%1100.00%
Total15100.00%1100.00%

MODULE_ALIAS_ND_DEVICE(ND_DEVICE_REGION_PMEM); MODULE_ALIAS_ND_DEVICE(ND_DEVICE_REGION_BLK);

Overall Contributors

PersonTokensPropCommitsCommitProp
Dan J Williams41560.94%969.23%
Dave Jiang13920.41%17.69%
Vishal Verma639.25%17.69%
Toshi Kani456.61%17.69%
Ross Zwisler192.79%17.69%
Total681100.00%13100.00%
Directory: drivers/nvdimm
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