[thirdparty/kernel/stable.git] / drivers / nvdimm / dax_devs.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright(c) 2013-2016 Intel Corporation. All rights reserved.
 */
#include <linux/device.h>
#include <linux/sizes.h>
#include <linux/slab.h>
#include <linux/mm.h>
#include "nd-core.h"
#include "pfn.h"
#include "nd.h"

static void nd_dax_release(struct device *dev)
{
	struct nd_region *nd_region = to_nd_region(dev->parent);
	struct nd_dax *nd_dax = to_nd_dax(dev);
	struct nd_pfn *nd_pfn = &nd_dax->nd_pfn;

	dev_dbg(dev, "trace\n");
	nd_detach_ndns(dev, &nd_pfn->ndns);
	ida_simple_remove(&nd_region->dax_ida, nd_pfn->id);
	kfree(nd_pfn->uuid);
	kfree(nd_dax);
}

static struct device_type nd_dax_device_type = {
	.name = "nd_dax",
	.release = nd_dax_release,
};

bool is_nd_dax(struct device *dev)
{
	return dev ? dev->type == &nd_dax_device_type : false;
}
EXPORT_SYMBOL(is_nd_dax);

struct nd_dax *to_nd_dax(struct device *dev)
{
	struct nd_dax *nd_dax = container_of(dev, struct nd_dax, nd_pfn.dev);

	WARN_ON(!is_nd_dax(dev));
	return nd_dax;
}
EXPORT_SYMBOL(to_nd_dax);

static const struct attribute_group *nd_dax_attribute_groups[] = {
	&nd_pfn_attribute_group,
	&nd_device_attribute_group,
	&nd_numa_attribute_group,
	NULL,
};

static struct nd_dax *nd_dax_alloc(struct nd_region *nd_region)
{
	struct nd_pfn *nd_pfn;
	struct nd_dax *nd_dax;
	struct device *dev;

	nd_dax = kzalloc(sizeof(*nd_dax), GFP_KERNEL);
	if (!nd_dax)
		return NULL;

	nd_pfn = &nd_dax->nd_pfn;
	nd_pfn->id = ida_simple_get(&nd_region->dax_ida, 0, 0, GFP_KERNEL);
	if (nd_pfn->id < 0) {
		kfree(nd_dax);
		return NULL;
	}

	dev = &nd_pfn->dev;
	dev_set_name(dev, "dax%d.%d", nd_region->id, nd_pfn->id);
	dev->groups = nd_dax_attribute_groups;
	dev->type = &nd_dax_device_type;
	dev->parent = &nd_region->dev;

	return nd_dax;
}

struct device *nd_dax_create(struct nd_region *nd_region)
{
	struct device *dev = NULL;
	struct nd_dax *nd_dax;

	if (!is_memory(&nd_region->dev))
		return NULL;

	nd_dax = nd_dax_alloc(nd_region);
	if (nd_dax)
		dev = nd_pfn_devinit(&nd_dax->nd_pfn, NULL);
	__nd_device_register(dev);
	return dev;
}

int nd_dax_probe(struct device *dev, struct nd_namespace_common *ndns)
{
	int rc;
	struct nd_dax *nd_dax;
	struct device *dax_dev;
	struct nd_pfn *nd_pfn;
	struct nd_pfn_sb *pfn_sb;
	struct nd_region *nd_region = to_nd_region(ndns->dev.parent);

	if (ndns->force_raw)
		return -ENODEV;

	switch (ndns->claim_class) {
	case NVDIMM_CCLASS_NONE:
	case NVDIMM_CCLASS_DAX:
		break;
	default:
		return -ENODEV;
	}

	nvdimm_bus_lock(&ndns->dev);
	nd_dax = nd_dax_alloc(nd_region);
	nd_pfn = &nd_dax->nd_pfn;
	dax_dev = nd_pfn_devinit(nd_pfn, ndns);
	nvdimm_bus_unlock(&ndns->dev);
	if (!dax_dev)
		return -ENOMEM;
	pfn_sb = devm_kmalloc(dev, sizeof(*pfn_sb), GFP_KERNEL);
	nd_pfn->pfn_sb = pfn_sb;
	rc = nd_pfn_validate(nd_pfn, DAX_SIG);
	dev_dbg(dev, "dax: %s\n", rc == 0 ? dev_name(dax_dev) : "<none>");
	if (rc < 0) {
		nd_detach_ndns(dax_dev, &nd_pfn->ndns);
		put_device(dax_dev);
	} else
		__nd_device_register(dax_dev);

	return rc;
}
EXPORT_SYMBOL(nd_dax_probe);
Commit	Line	Data
5b497af4	1	// SPDX-License-Identifier: GPL-2.0-only
cd03412a DW	2	/*
cd03412a DW	3	* Copyright(c) 2013-2016 Intel Corporation. All rights reserved.
cd03412a DW	4	*/
	5	#include <linux/device.h>
	6	#include <linux/sizes.h>
	7	#include <linux/slab.h>
	8	#include <linux/mm.h>
	9	#include "nd-core.h"
c5ed9268	10	#include "pfn.h"
cd03412a DW	11	#include "nd.h"
	12
	13	static void nd_dax_release(struct device *dev)
	14	{
	15	struct nd_region *nd_region = to_nd_region(dev->parent);
	16	struct nd_dax *nd_dax = to_nd_dax(dev);
	17	struct nd_pfn *nd_pfn = &nd_dax->nd_pfn;
	18
426824d6	19	dev_dbg(dev, "trace\n");
cd03412a DW	20	nd_detach_ndns(dev, &nd_pfn->ndns);
	21	ida_simple_remove(&nd_region->dax_ida, nd_pfn->id);
	22	kfree(nd_pfn->uuid);
	23	kfree(nd_dax);
	24	}
	25
	26	static struct device_type nd_dax_device_type = {
	27	.name = "nd_dax",
	28	.release = nd_dax_release,
	29	};
	30
	31	bool is_nd_dax(struct device *dev)
	32	{
	33	return dev ? dev->type == &nd_dax_device_type : false;
	34	}
	35	EXPORT_SYMBOL(is_nd_dax);
	36
	37	struct nd_dax to_nd_dax(struct device dev)
	38	{
	39	struct nd_dax *nd_dax = container_of(dev, struct nd_dax, nd_pfn.dev);
	40
	41	WARN_ON(!is_nd_dax(dev));
	42	return nd_dax;
	43	}
	44	EXPORT_SYMBOL(to_nd_dax);
	45
	46	static const struct attribute_group *nd_dax_attribute_groups[] = {
	47	&nd_pfn_attribute_group,
	48	&nd_device_attribute_group,
	49	&nd_numa_attribute_group,
	50	NULL,
	51	};
	52
	53	static struct nd_dax nd_dax_alloc(struct nd_region nd_region)
	54	{
	55	struct nd_pfn *nd_pfn;
	56	struct nd_dax *nd_dax;
	57	struct device *dev;
	58
	59	nd_dax = kzalloc(sizeof(*nd_dax), GFP_KERNEL);
	60	if (!nd_dax)
	61	return NULL;
	62
	63	nd_pfn = &nd_dax->nd_pfn;
	64	nd_pfn->id = ida_simple_get(&nd_region->dax_ida, 0, 0, GFP_KERNEL);
	65	if (nd_pfn->id < 0) {
	66	kfree(nd_dax);
	67	return NULL;
	68	}
	69
	70	dev = &nd_pfn->dev;
	71	dev_set_name(dev, "dax%d.%d", nd_region->id, nd_pfn->id);
	72	dev->groups = nd_dax_attribute_groups;
	73	dev->type = &nd_dax_device_type;
	74	dev->parent = &nd_region->dev;
	75
	76	return nd_dax;
	77	}
	78
	79	struct device nd_dax_create(struct nd_region nd_region)
	80	{
	81	struct device *dev = NULL;
	82	struct nd_dax *nd_dax;
	83
c9e582aa	84	if (!is_memory(&nd_region->dev))
cd03412a DW	85	return NULL;
	86
	87	nd_dax = nd_dax_alloc(nd_region);
	88	if (nd_dax)
	89	dev = nd_pfn_devinit(&nd_dax->nd_pfn, NULL);
	90	__nd_device_register(dev);
	91	return dev;
	92	}
c5ed9268 DW	93
	94	int nd_dax_probe(struct device dev, struct nd_namespace_common ndns)
	95	{
	96	int rc;
	97	struct nd_dax *nd_dax;
	98	struct device *dax_dev;
	99	struct nd_pfn *nd_pfn;
	100	struct nd_pfn_sb *pfn_sb;
	101	struct nd_region *nd_region = to_nd_region(ndns->dev.parent);
	102
	103	if (ndns->force_raw)
	104	return -ENODEV;
	105
b3fde74e DW	106	switch (ndns->claim_class) {
	107	case NVDIMM_CCLASS_NONE:
	108	case NVDIMM_CCLASS_DAX:
	109	break;
	110	default:
	111	return -ENODEV;
	112	}
	113
c5ed9268 DW	114	nvdimm_bus_lock(&ndns->dev);
	115	nd_dax = nd_dax_alloc(nd_region);
	116	nd_pfn = &nd_dax->nd_pfn;
	117	dax_dev = nd_pfn_devinit(nd_pfn, ndns);
	118	nvdimm_bus_unlock(&ndns->dev);
	119	if (!dax_dev)
	120	return -ENOMEM;
7e3e888d	121	pfn_sb = devm_kmalloc(dev, sizeof(*pfn_sb), GFP_KERNEL);
c5ed9268 DW	122	nd_pfn->pfn_sb = pfn_sb;
c5ed9268 DW	123	rc = nd_pfn_validate(nd_pfn, DAX_SIG);
426824d6	124	dev_dbg(dev, "dax: %s\n", rc == 0 ? dev_name(dax_dev) : "<none>");
c5ed9268	125	if (rc < 0) {
452bae0a	126	nd_detach_ndns(dax_dev, &nd_pfn->ndns);
c5ed9268 DW	127	put_device(dax_dev);
	128	} else
	129	__nd_device_register(dax_dev);
	130
	131	return rc;
	132	}
	133	EXPORT_SYMBOL(nd_dax_probe);