[linux-2.6-block.git] / drivers / nvdimm / region.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-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;
		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;
}

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);

	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);

	return 0;
}

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

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);
		}
	}
	device_for_each_child(dev, &event, child_notify);
}

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);
}

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);
Commit	Line	Data
3d88002e DW	1	/*
	2	* Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
	3	*
	4	* This program is free software; you can redistribute it and/or modify
	5	* it under the terms of version 2 of the GNU General Public License as
	6	* published by the Free Software Foundation.
	7	*
	8	* This program is distributed in the hope that it will be useful, but
	9	* WITHOUT ANY WARRANTY; without even the implied warranty of
	10	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	11	* General Public License for more details.
	12	*/
5212e11f	13	#include <linux/cpumask.h>
3d88002e DW	14	#include <linux/module.h>
	15	#include <linux/device.h>
	16	#include <linux/nd.h>
6a6bef90	17	#include "nd-core.h"
3d88002e DW	18	#include "nd.h"
	19
	20	static int nd_region_probe(struct device *dev)
	21	{
047fc8a1	22	int err, rc;
5212e11f	23	static unsigned long once;
e5ae3b25	24	struct nd_region_data *ndrd;
3d88002e	25	struct nd_region *nd_region = to_nd_region(dev);
3d88002e	26
5212e11f VV	27	if (nd_region->num_lanes > num_online_cpus()
	28	&& nd_region->num_lanes < num_possible_cpus()
	29	&& !test_and_set_bit(0, &once)) {
	30	dev_info(dev, "online cpus (%d) < concurrent i/o lanes (%d) < possible cpus (%d)\n",
	31	num_online_cpus(), nd_region->num_lanes,
	32	num_possible_cpus());
	33	dev_info(dev, "setting nr_cpus=%d may yield better libnvdimm device performance\n",
	34	nd_region->num_lanes);
	35	}
	36
e5ae3b25 DW	37	rc = nd_region_activate(nd_region);
	38	if (rc)
	39	return rc;
	40
047fc8a1 RZ	41	rc = nd_blk_region_init(nd_region);
	42	if (rc)
	43	return rc;
	44
	45	rc = nd_region_register_namespaces(nd_region, &err);
3d88002e DW	46	if (rc < 0)
	47	return rc;
	48
e5ae3b25 DW	49	ndrd = dev_get_drvdata(dev);
	50	ndrd->ns_active = rc;
	51	ndrd->ns_count = rc + err;
3d88002e	52
8c2f7e86 DW	53	if (rc && err && rc == err)
	54	return -ENODEV;
	55
6a6bef90 DJ	56	if (is_nd_pmem(&nd_region->dev)) {
	57	struct resource ndr_res;
	58
	59	if (devm_init_badblocks(dev, &nd_region->bb))
	60	return -ENODEV;
	61	ndr_res.start = nd_region->ndr_start;
	62	ndr_res.end = nd_region->ndr_start + nd_region->ndr_size - 1;
	63	nvdimm_badblocks_populate(nd_region,
	64	&nd_region->bb, &ndr_res);
	65	}
	66
8c2f7e86	67	nd_region->btt_seed = nd_btt_create(nd_region);
e1455744	68	nd_region->pfn_seed = nd_pfn_create(nd_region);
cd03412a	69	nd_region->dax_seed = nd_dax_create(nd_region);
3d88002e DW	70	if (err == 0)
	71	return 0;
	72
3d88002e DW	73	/*
	74	* Given multiple namespaces per region, we do not want to
	75	* disable all the successfully registered peer namespaces upon
	76	* a single registration failure. If userspace is missing a
	77	* namespace that it expects it can disable/re-enable the region
	78	* to retry discovery after correcting the failure.
	79	* <regionX>/namespaces returns the current
	80	* "<async-registered>/<total>" namespace count.
	81	*/
	82	dev_err(dev, "failed to register %d namespace%s, continuing...\n",
	83	err, err == 1 ? "" : "s");
	84	return 0;
	85	}
	86
	87	static int child_unregister(struct device dev, void data)
	88	{
	89	nd_device_unregister(dev, ND_SYNC);
	90	return 0;
	91	}
	92
	93	static int nd_region_remove(struct device *dev)
	94	{
bf9bccc1 DW	95	struct nd_region *nd_region = to_nd_region(dev);
bf9bccc1 DW	96
a8f72022 DW	97	device_for_each_child(dev, NULL, child_unregister);
a8f72022 DW	98
3d88002e DW	99	/* flush attribute readers and disable */
3d88002e DW	100	nvdimm_bus_lock(dev);
bf9bccc1	101	nd_region->ns_seed = NULL;
8c2f7e86	102	nd_region->btt_seed = NULL;
e1455744	103	nd_region->pfn_seed = NULL;
cd03412a	104	nd_region->dax_seed = NULL;
3d88002e DW	105	dev_set_drvdata(dev, NULL);
	106	nvdimm_bus_unlock(dev);
	107
3d88002e DW	108	return 0;
	109	}
	110
71999466 DW	111	static int child_notify(struct device dev, void data)
	112	{
	113	nd_device_notify(dev, (enum nvdimm_event ) data);
	114	return 0;
	115	}
	116
	117	static void nd_region_notify(struct device *dev, enum nvdimm_event event)
	118	{
6a6bef90 DJ	119	if (event == NVDIMM_REVALIDATE_POISON) {
	120	struct nd_region *nd_region = to_nd_region(dev);
	121	struct resource res;
	122
	123	if (is_nd_pmem(&nd_region->dev)) {
	124	res.start = nd_region->ndr_start;
	125	res.end = nd_region->ndr_start +
	126	nd_region->ndr_size - 1;
	127	nvdimm_badblocks_populate(nd_region,
	128	&nd_region->bb, &res);
	129	}
	130	}
71999466 DW	131	device_for_each_child(dev, &event, child_notify);
	132	}
	133
3d88002e DW	134	static struct nd_device_driver nd_region_driver = {
	135	.probe = nd_region_probe,
	136	.remove = nd_region_remove,
71999466	137	.notify = nd_region_notify,
3d88002e DW	138	.drv = {
	139	.name = "nd_region",
	140	},
	141	.type = ND_DRIVER_REGION_BLK \| ND_DRIVER_REGION_PMEM,
	142	};
	143
	144	int __init nd_region_init(void)
	145	{
	146	return nd_driver_register(&nd_region_driver);
	147	}
	148
	149	void nd_region_exit(void)
	150	{
	151	driver_unregister(&nd_region_driver.drv);
	152	}
	153
	154	MODULE_ALIAS_ND_DEVICE(ND_DEVICE_REGION_PMEM);
	155	MODULE_ALIAS_ND_DEVICE(ND_DEVICE_REGION_BLK);