115 lines
3.0 KiB
C
115 lines
3.0 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/cpumask.h>
|
|
#include <linux/module.h>
|
|
#include <linux/device.h>
|
|
#include <linux/nd.h>
|
|
#include "nd.h"
|
|
|
|
static int nd_region_probe(struct device *dev)
|
|
{
|
|
int err, rc;
|
|
static unsigned long once;
|
|
struct nd_region_namespaces *num_ns;
|
|
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_blk_region_init(nd_region);
|
|
if (rc)
|
|
return rc;
|
|
|
|
rc = nd_region_register_namespaces(nd_region, &err);
|
|
num_ns = devm_kzalloc(dev, sizeof(*num_ns), GFP_KERNEL);
|
|
if (!num_ns)
|
|
return -ENOMEM;
|
|
|
|
if (rc < 0)
|
|
return rc;
|
|
|
|
num_ns->active = rc;
|
|
num_ns->count = rc + err;
|
|
dev_set_drvdata(dev, num_ns);
|
|
|
|
if (rc && err && rc == err)
|
|
return -ENODEV;
|
|
|
|
nd_region->btt_seed = nd_btt_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;
|
|
}
|
|
|
|
static int child_unregister(struct device *dev, void *data)
|
|
{
|
|
nd_device_unregister(dev, ND_SYNC);
|
|
return 0;
|
|
}
|
|
|
|
static int nd_region_remove(struct device *dev)
|
|
{
|
|
struct nd_region *nd_region = to_nd_region(dev);
|
|
|
|
/* flush attribute readers and disable */
|
|
nvdimm_bus_lock(dev);
|
|
nd_region->ns_seed = NULL;
|
|
nd_region->btt_seed = NULL;
|
|
dev_set_drvdata(dev, NULL);
|
|
nvdimm_bus_unlock(dev);
|
|
|
|
device_for_each_child(dev, NULL, child_unregister);
|
|
return 0;
|
|
}
|
|
|
|
static struct nd_device_driver nd_region_driver = {
|
|
.probe = nd_region_probe,
|
|
.remove = nd_region_remove,
|
|
.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);
|
|
}
|
|
|
|
void nd_region_exit(void)
|
|
{
|
|
driver_unregister(&nd_region_driver.drv);
|
|
}
|
|
|
|
MODULE_ALIAS_ND_DEVICE(ND_DEVICE_REGION_PMEM);
|
|
MODULE_ALIAS_ND_DEVICE(ND_DEVICE_REGION_BLK);
|