[linux-2.6-block.git] / drivers / dax / pmem.c

// SPDX-License-Identifier: GPL-2.0
/* Copyright(c) 2016 - 2018 Intel Corporation. All rights reserved. */
#include <linux/memremap.h>
#include <linux/module.h>
#include <linux/pfn_t.h>
#include "../nvdimm/pfn.h"
#include "../nvdimm/nd.h"
#include "bus.h"

static struct dev_dax *__dax_pmem_probe(struct device *dev)
{
	struct range range;
	int rc, id, region_id;
	resource_size_t offset;
	struct nd_pfn_sb *pfn_sb;
	struct dev_dax_data data;
	struct nd_namespace_io *nsio;
	struct dax_region *dax_region;
	struct dev_pagemap pgmap = { };
	struct nd_namespace_common *ndns;
	struct nd_dax *nd_dax = to_nd_dax(dev);
	struct nd_pfn *nd_pfn = &nd_dax->nd_pfn;
	struct nd_region *nd_region = to_nd_region(dev->parent);

	ndns = nvdimm_namespace_common_probe(dev);
	if (IS_ERR(ndns))
		return ERR_CAST(ndns);

	/* parse the 'pfn' info block via ->rw_bytes */
	rc = devm_namespace_enable(dev, ndns, nd_info_block_reserve());
	if (rc)
		return ERR_PTR(rc);
	rc = nvdimm_setup_pfn(nd_pfn, &pgmap);
	if (rc)
		return ERR_PTR(rc);
	devm_namespace_disable(dev, ndns);

	/* reserve the metadata area, device-dax will reserve the data */
	pfn_sb = nd_pfn->pfn_sb;
	offset = le64_to_cpu(pfn_sb->dataoff);
	nsio = to_nd_namespace_io(&ndns->dev);
	if (!devm_request_mem_region(dev, nsio->res.start, offset,
				dev_name(&ndns->dev))) {
		dev_warn(dev, "could not reserve metadata\n");
		return ERR_PTR(-EBUSY);
	}

	rc = sscanf(dev_name(&ndns->dev), "namespace%d.%d", &region_id, &id);
	if (rc != 2)
		return ERR_PTR(-EINVAL);

	/* adjust the dax_region range to the start of data */
	range = pgmap.range;
	range.start += offset;
	dax_region = alloc_dax_region(dev, region_id, &range,
			nd_region->target_node, le32_to_cpu(pfn_sb->align),
			IORESOURCE_DAX_STATIC);
	if (!dax_region)
		return ERR_PTR(-ENOMEM);

	data = (struct dev_dax_data) {
		.dax_region = dax_region,
		.id = id,
		.pgmap = &pgmap,
		.size = range_len(&range),
	};

	return devm_create_dev_dax(&data);
}

static int dax_pmem_probe(struct device *dev)
{
	return PTR_ERR_OR_ZERO(__dax_pmem_probe(dev));
}

static struct nd_device_driver dax_pmem_driver = {
	.probe = dax_pmem_probe,
	.drv = {
		.name = "dax_pmem",
	},
	.type = ND_DRIVER_DAX_PMEM,
};

static int __init dax_pmem_init(void)
{
	return nd_driver_register(&dax_pmem_driver);
}
module_init(dax_pmem_init);

static void __exit dax_pmem_exit(void)
{
	driver_unregister(&dax_pmem_driver.drv);
}
module_exit(dax_pmem_exit);

MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Intel Corporation");
MODULE_ALIAS_ND_DEVICE(ND_DEVICE_DAX_PMEM);
Commit	Line	Data
730926c3 DW	1	// SPDX-License-Identifier: GPL-2.0
730926c3 DW	2	/* Copyright(c) 2016 - 2018 Intel Corporation. All rights reserved. */
ab68f262 DW	3	#include <linux/memremap.h>
	4	#include <linux/module.h>
	5	#include <linux/pfn_t.h>
83762cb5 DW	6	#include "../nvdimm/pfn.h"
	7	#include "../nvdimm/nd.h"
	8	#include "bus.h"
ab68f262	9
83762cb5	10	static struct dev_dax __dax_pmem_probe(struct device dev)
ab68f262	11	{
a4574f63	12	struct range range;
bbb3be17	13	int rc, id, region_id;
89ec9f2c	14	resource_size_t offset;
ab68f262	15	struct nd_pfn_sb *pfn_sb;
174ebece	16	struct dev_dax_data data;
ab68f262 DW	17	struct nd_namespace_io *nsio;
ab68f262 DW	18	struct dax_region *dax_region;
1e240e8d	19	struct dev_pagemap pgmap = { };
ab68f262 DW	20	struct nd_namespace_common *ndns;
	21	struct nd_dax *nd_dax = to_nd_dax(dev);
	22	struct nd_pfn *nd_pfn = &nd_dax->nd_pfn;
8fc5c735	23	struct nd_region *nd_region = to_nd_region(dev->parent);
ab68f262 DW	24
	25	ndns = nvdimm_namespace_common_probe(dev);
	26	if (IS_ERR(ndns))
730926c3	27	return ERR_CAST(ndns);
ab68f262 DW	28
ab68f262 DW	29	/* parse the 'pfn' info block via ->rw_bytes */
8f4b01fc	30	rc = devm_namespace_enable(dev, ndns, nd_info_block_reserve());
6a84fb4b	31	if (rc)
730926c3	32	return ERR_PTR(rc);
89ec9f2c	33	rc = nvdimm_setup_pfn(nd_pfn, &pgmap);
e8d51348	34	if (rc)
730926c3	35	return ERR_PTR(rc);
8f4b01fc	36	devm_namespace_disable(dev, ndns);
ab68f262	37
89ec9f2c	38	/* reserve the metadata area, device-dax will reserve the data */
d521fbae	39	pfn_sb = nd_pfn->pfn_sb;
89ec9f2c	40	offset = le64_to_cpu(pfn_sb->dataoff);
8f4b01fc	41	nsio = to_nd_namespace_io(&ndns->dev);
89ec9f2c	42	if (!devm_request_mem_region(dev, nsio->res.start, offset,
450c6633	43	dev_name(&ndns->dev))) {
d521fbae	44	dev_warn(dev, "could not reserve metadata\n");
730926c3	45	return ERR_PTR(-EBUSY);
d521fbae	46	}
d0e58455	47
bbb3be17 DW	48	rc = sscanf(dev_name(&ndns->dev), "namespace%d.%d", &region_id, &id);
bbb3be17 DW	49	if (rc != 2)
730926c3	50	return ERR_PTR(-EINVAL);
bbb3be17	51
a4574f63 DW	52	/* adjust the dax_region range to the start of data */
a4574f63 DW	53	range = pgmap.range;
4e6a7b3b	54	range.start += offset;
a4574f63	55	dax_region = alloc_dax_region(dev, region_id, &range,
c2f3011e DW	56	nd_region->target_node, le32_to_cpu(pfn_sb->align),
c2f3011e DW	57	IORESOURCE_DAX_STATIC);
ab68f262	58	if (!dax_region)
730926c3	59	return ERR_PTR(-ENOMEM);
ab68f262	60
174ebece DW	61	data = (struct dev_dax_data) {
	62	.dax_region = dax_region,
	63	.id = id,
	64	.pgmap = &pgmap,
a4574f63	65	.size = range_len(&range),
174ebece	66	};
ab68f262	67
2532f416	68	return devm_create_dev_dax(&data);
ab68f262	69	}
83762cb5 DW	70
	71	static int dax_pmem_probe(struct device *dev)
	72	{
	73	return PTR_ERR_OR_ZERO(__dax_pmem_probe(dev));
	74	}
	75
	76	static struct nd_device_driver dax_pmem_driver = {
	77	.probe = dax_pmem_probe,
	78	.drv = {
	79	.name = "dax_pmem",
	80	},
	81	.type = ND_DRIVER_DAX_PMEM,
	82	};
	83
	84	static int __init dax_pmem_init(void)
	85	{
	86	return nd_driver_register(&dax_pmem_driver);
	87	}
	88	module_init(dax_pmem_init);
	89
	90	static void __exit dax_pmem_exit(void)
	91	{
	92	driver_unregister(&dax_pmem_driver.drv);
	93	}
	94	module_exit(dax_pmem_exit);
ab68f262 DW	95
	96	MODULE_LICENSE("GPL v2");
	97	MODULE_AUTHOR("Intel Corporation");
83762cb5	98	MODULE_ALIAS_ND_DEVICE(ND_DEVICE_DAX_PMEM);