[deliverable/linux.git] / drivers / nvdimm / pmem.c

/*
 * Persistent Memory Driver
 *
 * Copyright (c) 2014-2015, Intel Corporation.
 * Copyright (c) 2015, Christoph Hellwig <hch@lst.de>.
 * Copyright (c) 2015, Boaz Harrosh <boaz@plexistor.com>.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope 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 <asm/cacheflush.h>
#include <linux/blkdev.h>
#include <linux/hdreg.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/badblocks.h>
#include <linux/memremap.h>
#include <linux/vmalloc.h>
#include <linux/pfn_t.h>
#include <linux/slab.h>
#include <linux/pmem.h>
#include <linux/nd.h>
#include "pmem.h"
#include "pfn.h"
#include "nd.h"

static struct device *to_dev(struct pmem_device *pmem)
{
	/*
	 * nvdimm bus services need a 'dev' parameter, and we record the device
	 * at init in bb.dev.
	 */
	return pmem->bb.dev;
}

static struct nd_region *to_region(struct pmem_device *pmem)
{
	return to_nd_region(to_dev(pmem)->parent);
}

static void pmem_clear_poison(struct pmem_device *pmem, phys_addr_t offset,
		unsigned int len)
{
	struct device *dev = to_dev(pmem);
	sector_t sector;
	long cleared;

	sector = (offset - pmem->data_offset) / 512;
	cleared = nvdimm_clear_poison(dev, pmem->phys_addr + offset, len);

	if (cleared > 0 && cleared / 512) {
		dev_dbg(dev, "%s: %llx clear %ld sector%s\n",
				__func__, (unsigned long long) sector,
				cleared / 512, cleared / 512 > 1 ? "s" : "");
		badblocks_clear(&pmem->bb, sector, cleared / 512);
	}
	invalidate_pmem(pmem->virt_addr + offset, len);
}

static int pmem_do_bvec(struct pmem_device *pmem, struct page *page,
			unsigned int len, unsigned int off, int rw,
			sector_t sector)
{
	int rc = 0;
	bool bad_pmem = false;
	void *mem = kmap_atomic(page);
	phys_addr_t pmem_off = sector * 512 + pmem->data_offset;
	void __pmem *pmem_addr = pmem->virt_addr + pmem_off;

	if (unlikely(is_bad_pmem(&pmem->bb, sector, len)))
		bad_pmem = true;

	if (rw == READ) {
		if (unlikely(bad_pmem))
			rc = -EIO;
		else {
			rc = memcpy_from_pmem(mem + off, pmem_addr, len);
			flush_dcache_page(page);
		}
	} else {
		/*
		 * Note that we write the data both before and after
		 * clearing poison.  The write before clear poison
		 * handles situations where the latest written data is
		 * preserved and the clear poison operation simply marks
		 * the address range as valid without changing the data.
		 * In this case application software can assume that an
		 * interrupted write will either return the new good
		 * data or an error.
		 *
		 * However, if pmem_clear_poison() leaves the data in an
		 * indeterminate state we need to perform the write
		 * after clear poison.
		 */
		flush_dcache_page(page);
		memcpy_to_pmem(pmem_addr, mem + off, len);
		if (unlikely(bad_pmem)) {
			pmem_clear_poison(pmem, pmem_off, len);
			memcpy_to_pmem(pmem_addr, mem + off, len);
		}
	}

	kunmap_atomic(mem);
	return rc;
}

static blk_qc_t pmem_make_request(struct request_queue *q, struct bio *bio)
{
	int rc = 0;
	bool do_acct;
	unsigned long start;
	struct bio_vec bvec;
	struct bvec_iter iter;
	struct pmem_device *pmem = q->queuedata;

	do_acct = nd_iostat_start(bio, &start);
	bio_for_each_segment(bvec, bio, iter) {
		rc = pmem_do_bvec(pmem, bvec.bv_page, bvec.bv_len,
				bvec.bv_offset, bio_data_dir(bio),
				iter.bi_sector);
		if (rc) {
			bio->bi_error = rc;
			break;
		}
	}
	if (do_acct)
		nd_iostat_end(bio, start);

	if (bio_data_dir(bio))
		nvdimm_flush(to_region(pmem));

	bio_endio(bio);
	return BLK_QC_T_NONE;
}

static int pmem_rw_page(struct block_device *bdev, sector_t sector,
		       struct page *page, int rw)
{
	struct pmem_device *pmem = bdev->bd_queue->queuedata;
	int rc;

	rc = pmem_do_bvec(pmem, page, PAGE_SIZE, 0, rw, sector);
	if (rw & WRITE)
		nvdimm_flush(to_region(pmem));

	/*
	 * The ->rw_page interface is subtle and tricky.  The core
	 * retries on any error, so we can only invoke page_endio() in
	 * the successful completion case.  Otherwise, we'll see crashes
	 * caused by double completion.
	 */
	if (rc == 0)
		page_endio(page, rw & WRITE, 0);

	return rc;
}

/* see "strong" declaration in tools/testing/nvdimm/pmem-dax.c */
__weak long pmem_direct_access(struct block_device *bdev, sector_t sector,
		      void __pmem **kaddr, pfn_t *pfn, long size)
{
	struct pmem_device *pmem = bdev->bd_queue->queuedata;
	resource_size_t offset = sector * 512 + pmem->data_offset;

	if (unlikely(is_bad_pmem(&pmem->bb, sector, size)))
		return -EIO;
	*kaddr = pmem->virt_addr + offset;
	*pfn = phys_to_pfn_t(pmem->phys_addr + offset, pmem->pfn_flags);

	/*
	 * If badblocks are present, limit known good range to the
	 * requested range.
	 */
	if (unlikely(pmem->bb.count))
		return size;
	return pmem->size - pmem->pfn_pad - offset;
}

static const struct block_device_operations pmem_fops = {
	.owner =		THIS_MODULE,
	.rw_page =		pmem_rw_page,
	.direct_access =	pmem_direct_access,
	.revalidate_disk =	nvdimm_revalidate_disk,
};

static void pmem_release_queue(void *q)
{
	blk_cleanup_queue(q);
}

static void pmem_release_disk(void *disk)
{
	del_gendisk(disk);
	put_disk(disk);
}

static int pmem_attach_disk(struct device *dev,
		struct nd_namespace_common *ndns)
{
	struct nd_namespace_io *nsio = to_nd_namespace_io(&ndns->dev);
	struct nd_region *nd_region = to_nd_region(dev->parent);
	struct vmem_altmap __altmap, *altmap = NULL;
	struct resource *res = &nsio->res;
	struct nd_pfn *nd_pfn = NULL;
	int nid = dev_to_node(dev);
	struct nd_pfn_sb *pfn_sb;
	struct pmem_device *pmem;
	struct resource pfn_res;
	struct request_queue *q;
	struct gendisk *disk;
	void *addr;

	/* while nsio_rw_bytes is active, parse a pfn info block if present */
	if (is_nd_pfn(dev)) {
		nd_pfn = to_nd_pfn(dev);
		altmap = nvdimm_setup_pfn(nd_pfn, &pfn_res, &__altmap);
		if (IS_ERR(altmap))
			return PTR_ERR(altmap);
	}

	/* we're attaching a block device, disable raw namespace access */
	devm_nsio_disable(dev, nsio);

	pmem = devm_kzalloc(dev, sizeof(*pmem), GFP_KERNEL);
	if (!pmem)
		return -ENOMEM;

	dev_set_drvdata(dev, pmem);
	pmem->phys_addr = res->start;
	pmem->size = resource_size(res);
	if (nvdimm_has_flush(nd_region) < 0)
		dev_warn(dev, "unable to guarantee persistence of writes\n");

	if (!devm_request_mem_region(dev, res->start, resource_size(res),
				dev_name(dev))) {
		dev_warn(dev, "could not reserve region %pR\n", res);
		return -EBUSY;
	}

	q = blk_alloc_queue_node(GFP_KERNEL, dev_to_node(dev));
	if (!q)
		return -ENOMEM;

	pmem->pfn_flags = PFN_DEV;
	if (is_nd_pfn(dev)) {
		addr = devm_memremap_pages(dev, &pfn_res, &q->q_usage_counter,
				altmap);
		pfn_sb = nd_pfn->pfn_sb;
		pmem->data_offset = le64_to_cpu(pfn_sb->dataoff);
		pmem->pfn_pad = resource_size(res) - resource_size(&pfn_res);
		pmem->pfn_flags |= PFN_MAP;
		res = &pfn_res; /* for badblocks populate */
		res->start += pmem->data_offset;
	} else if (pmem_should_map_pages(dev)) {
		addr = devm_memremap_pages(dev, &nsio->res,
				&q->q_usage_counter, NULL);
		pmem->pfn_flags |= PFN_MAP;
	} else
		addr = devm_memremap(dev, pmem->phys_addr,
				pmem->size, ARCH_MEMREMAP_PMEM);

	/*
	 * At release time the queue must be dead before
	 * devm_memremap_pages is unwound
	 */
	if (devm_add_action_or_reset(dev, pmem_release_queue, q))
		return -ENOMEM;

	if (IS_ERR(addr))
		return PTR_ERR(addr);
	pmem->virt_addr = (void __pmem *) addr;

	blk_queue_make_request(q, pmem_make_request);
	blk_queue_physical_block_size(q, PAGE_SIZE);
	blk_queue_max_hw_sectors(q, UINT_MAX);
	blk_queue_bounce_limit(q, BLK_BOUNCE_ANY);
	queue_flag_set_unlocked(QUEUE_FLAG_NONROT, q);
	q->queuedata = pmem;

	disk = alloc_disk_node(0, nid);
	if (!disk)
		return -ENOMEM;

	disk->fops		= &pmem_fops;
	disk->queue		= q;
	disk->flags		= GENHD_FL_EXT_DEVT;
	nvdimm_namespace_disk_name(ndns, disk->disk_name);
	disk->driverfs_dev = dev;
	set_capacity(disk, (pmem->size - pmem->pfn_pad - pmem->data_offset)
			/ 512);
	if (devm_init_badblocks(dev, &pmem->bb))
		return -ENOMEM;
	nvdimm_badblocks_populate(nd_region, &pmem->bb, res);
	disk->bb = &pmem->bb;
	add_disk(disk);

	if (devm_add_action_or_reset(dev, pmem_release_disk, disk))
		return -ENOMEM;

	revalidate_disk(disk);

	return 0;
}

static int nd_pmem_probe(struct device *dev)
{
	struct nd_namespace_common *ndns;

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

	if (devm_nsio_enable(dev, to_nd_namespace_io(&ndns->dev)))
		return -ENXIO;

	if (is_nd_btt(dev))
		return nvdimm_namespace_attach_btt(ndns);

	if (is_nd_pfn(dev))
		return pmem_attach_disk(dev, ndns);

	/* if we find a valid info-block we'll come back as that personality */
	if (nd_btt_probe(dev, ndns) == 0 || nd_pfn_probe(dev, ndns) == 0
			|| nd_dax_probe(dev, ndns) == 0)
		return -ENXIO;

	/* ...otherwise we're just a raw pmem device */
	return pmem_attach_disk(dev, ndns);
}

static int nd_pmem_remove(struct device *dev)
{
	if (is_nd_btt(dev))
		nvdimm_namespace_detach_btt(to_nd_btt(dev));
	return 0;
}

static void nd_pmem_notify(struct device *dev, enum nvdimm_event event)
{
	struct pmem_device *pmem = dev_get_drvdata(dev);
	struct nd_region *nd_region = to_region(pmem);
	resource_size_t offset = 0, end_trunc = 0;
	struct nd_namespace_common *ndns;
	struct nd_namespace_io *nsio;
	struct resource res;

	if (event != NVDIMM_REVALIDATE_POISON)
		return;

	if (is_nd_btt(dev)) {
		struct nd_btt *nd_btt = to_nd_btt(dev);

		ndns = nd_btt->ndns;
	} else if (is_nd_pfn(dev)) {
		struct nd_pfn *nd_pfn = to_nd_pfn(dev);
		struct nd_pfn_sb *pfn_sb = nd_pfn->pfn_sb;

		ndns = nd_pfn->ndns;
		offset = pmem->data_offset + __le32_to_cpu(pfn_sb->start_pad);
		end_trunc = __le32_to_cpu(pfn_sb->end_trunc);
	} else
		ndns = to_ndns(dev);

	nsio = to_nd_namespace_io(&ndns->dev);
	res.start = nsio->res.start + offset;
	res.end = nsio->res.end - end_trunc;
	nvdimm_badblocks_populate(nd_region, &pmem->bb, &res);
}

MODULE_ALIAS("pmem");
MODULE_ALIAS_ND_DEVICE(ND_DEVICE_NAMESPACE_IO);
MODULE_ALIAS_ND_DEVICE(ND_DEVICE_NAMESPACE_PMEM);
static struct nd_device_driver nd_pmem_driver = {
	.probe = nd_pmem_probe,
	.remove = nd_pmem_remove,
	.notify = nd_pmem_notify,
	.drv = {
		.name = "nd_pmem",
	},
	.type = ND_DRIVER_NAMESPACE_IO | ND_DRIVER_NAMESPACE_PMEM,
};

static int __init pmem_init(void)
{
	return nd_driver_register(&nd_pmem_driver);
}
module_init(pmem_init);

static void pmem_exit(void)
{
	driver_unregister(&nd_pmem_driver.drv);
}
module_exit(pmem_exit);

MODULE_AUTHOR("Ross Zwisler <ross.zwisler@linux.intel.com>");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
9e853f23 RZ	1	/*
	2	* Persistent Memory Driver
	3	*
9f53f9fa	4	* Copyright (c) 2014-2015, Intel Corporation.
9e853f23 RZ	5	* Copyright (c) 2015, Christoph Hellwig <hch@lst.de>.
	6	* Copyright (c) 2015, Boaz Harrosh <boaz@plexistor.com>.
	7	*
	8	* This program is free software; you can redistribute it and/or modify it
	9	* under the terms and conditions of the GNU General Public License,
	10	* version 2, as published by the Free Software Foundation.
	11	*
	12	* This program is distributed in the hope it will be useful, but WITHOUT
	13	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	14	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
	15	* more details.
	16	*/
	17
	18	#include <asm/cacheflush.h>
	19	#include <linux/blkdev.h>
	20	#include <linux/hdreg.h>
	21	#include <linux/init.h>
	22	#include <linux/platform_device.h>
	23	#include <linux/module.h>
	24	#include <linux/moduleparam.h>
b95f5f43	25	#include <linux/badblocks.h>
9476df7d	26	#include <linux/memremap.h>
32ab0a3f	27	#include <linux/vmalloc.h>
34c0fd54	28	#include <linux/pfn_t.h>
9e853f23	29	#include <linux/slab.h>
61031952	30	#include <linux/pmem.h>
9f53f9fa	31	#include <linux/nd.h>
f295e53b	32	#include "pmem.h"
32ab0a3f	33	#include "pfn.h"
9f53f9fa	34	#include "nd.h"
9e853f23	35
f284a4f2 DW	36	static struct device to_dev(struct pmem_device pmem)
	37	{
	38	/*
	39	* nvdimm bus services need a 'dev' parameter, and we record the device
	40	* at init in bb.dev.
	41	*/
	42	return pmem->bb.dev;
	43	}
	44
	45	static struct nd_region to_region(struct pmem_device pmem)
	46	{
	47	return to_nd_region(to_dev(pmem)->parent);
	48	}
	49
59e64739 DW	50	static void pmem_clear_poison(struct pmem_device *pmem, phys_addr_t offset,
	51	unsigned int len)
	52	{
f284a4f2	53	struct device *dev = to_dev(pmem);
59e64739 DW	54	sector_t sector;
	55	long cleared;
	56
	57	sector = (offset - pmem->data_offset) / 512;
	58	cleared = nvdimm_clear_poison(dev, pmem->phys_addr + offset, len);
	59
	60	if (cleared > 0 && cleared / 512) {
	61	dev_dbg(dev, "%s: %llx clear %ld sector%s\n",
	62	__func__, (unsigned long long) sector,
	63	cleared / 512, cleared / 512 > 1 ? "s" : "");
	64	badblocks_clear(&pmem->bb, sector, cleared / 512);
	65	}
	66	invalidate_pmem(pmem->virt_addr + offset, len);
	67	}
	68
e10624f8	69	static int pmem_do_bvec(struct pmem_device pmem, struct page page,
9e853f23 RZ	70	unsigned int len, unsigned int off, int rw,
	71	sector_t sector)
	72	{
b5ebc8ec	73	int rc = 0;
59e64739	74	bool bad_pmem = false;
9e853f23	75	void *mem = kmap_atomic(page);
32ab0a3f	76	phys_addr_t pmem_off = sector * 512 + pmem->data_offset;
61031952	77	void __pmem *pmem_addr = pmem->virt_addr + pmem_off;
9e853f23	78
59e64739 DW	79	if (unlikely(is_bad_pmem(&pmem->bb, sector, len)))
	80	bad_pmem = true;
	81
9e853f23	82	if (rw == READ) {
59e64739	83	if (unlikely(bad_pmem))
b5ebc8ec DW	84	rc = -EIO;
b5ebc8ec DW	85	else {
fc0c2028	86	rc = memcpy_from_pmem(mem + off, pmem_addr, len);
b5ebc8ec DW	87	flush_dcache_page(page);
b5ebc8ec DW	88	}
9e853f23	89	} else {
0a370d26 DW	90	/*
	91	* Note that we write the data both before and after
	92	* clearing poison. The write before clear poison
	93	* handles situations where the latest written data is
	94	* preserved and the clear poison operation simply marks
	95	* the address range as valid without changing the data.
	96	* In this case application software can assume that an
	97	* interrupted write will either return the new good
	98	* data or an error.
	99	*
	100	* However, if pmem_clear_poison() leaves the data in an
	101	* indeterminate state we need to perform the write
	102	* after clear poison.
	103	*/
9e853f23	104	flush_dcache_page(page);
61031952	105	memcpy_to_pmem(pmem_addr, mem + off, len);
59e64739 DW	106	if (unlikely(bad_pmem)) {
	107	pmem_clear_poison(pmem, pmem_off, len);
	108	memcpy_to_pmem(pmem_addr, mem + off, len);
	109	}
9e853f23 RZ	110	}
	111
	112	kunmap_atomic(mem);
b5ebc8ec	113	return rc;
9e853f23 RZ	114	}
9e853f23 RZ	115
dece1635	116	static blk_qc_t pmem_make_request(struct request_queue q, struct bio bio)
9e853f23	117	{
e10624f8	118	int rc = 0;
f0dc089c DW	119	bool do_acct;
f0dc089c DW	120	unsigned long start;
9e853f23	121	struct bio_vec bvec;
9e853f23	122	struct bvec_iter iter;
bd842b8c	123	struct pmem_device *pmem = q->queuedata;
9e853f23	124
f0dc089c	125	do_acct = nd_iostat_start(bio, &start);
e10624f8 DW	126	bio_for_each_segment(bvec, bio, iter) {
	127	rc = pmem_do_bvec(pmem, bvec.bv_page, bvec.bv_len,
	128	bvec.bv_offset, bio_data_dir(bio),
	129	iter.bi_sector);
	130	if (rc) {
	131	bio->bi_error = rc;
	132	break;
	133	}
	134	}
f0dc089c DW	135	if (do_acct)
f0dc089c DW	136	nd_iostat_end(bio, start);
61031952 RZ	137
61031952 RZ	138	if (bio_data_dir(bio))
f284a4f2	139	nvdimm_flush(to_region(pmem));
61031952	140
4246a0b6	141	bio_endio(bio);
dece1635	142	return BLK_QC_T_NONE;
9e853f23 RZ	143	}
	144
	145	static int pmem_rw_page(struct block_device *bdev, sector_t sector,
	146	struct page *page, int rw)
	147	{
bd842b8c	148	struct pmem_device *pmem = bdev->bd_queue->queuedata;
e10624f8	149	int rc;
9e853f23	150
09cbfeaf	151	rc = pmem_do_bvec(pmem, page, PAGE_SIZE, 0, rw, sector);
ba8fe0f8	152	if (rw & WRITE)
f284a4f2	153	nvdimm_flush(to_region(pmem));
9e853f23	154
e10624f8 DW	155	/*
	156	* The ->rw_page interface is subtle and tricky. The core
	157	* retries on any error, so we can only invoke page_endio() in
	158	* the successful completion case. Otherwise, we'll see crashes
	159	* caused by double completion.
	160	*/
	161	if (rc == 0)
	162	page_endio(page, rw & WRITE, 0);
	163
	164	return rc;
9e853f23 RZ	165	}
9e853f23 RZ	166
f295e53b DW	167	/* see "strong" declaration in tools/testing/nvdimm/pmem-dax.c */
f295e53b DW	168	__weak long pmem_direct_access(struct block_device *bdev, sector_t sector,
0a70bd43	169	void __pmem *kaddr, pfn_t pfn, long size)
9e853f23	170	{
bd842b8c	171	struct pmem_device *pmem = bdev->bd_queue->queuedata;
32ab0a3f	172	resource_size_t offset = sector * 512 + pmem->data_offset;
589e75d1	173
0a70bd43 DW	174	if (unlikely(is_bad_pmem(&pmem->bb, sector, size)))
0a70bd43 DW	175	return -EIO;
e2e05394	176	*kaddr = pmem->virt_addr + offset;
34c0fd54	177	*pfn = phys_to_pfn_t(pmem->phys_addr + offset, pmem->pfn_flags);
9e853f23	178
0a70bd43 DW	179	/*
	180	* If badblocks are present, limit known good range to the
	181	* requested range.
	182	*/
	183	if (unlikely(pmem->bb.count))
	184	return size;
cfe30b87	185	return pmem->size - pmem->pfn_pad - offset;
9e853f23 RZ	186	}
	187
	188	static const struct block_device_operations pmem_fops = {
	189	.owner = THIS_MODULE,
	190	.rw_page = pmem_rw_page,
	191	.direct_access = pmem_direct_access,
58138820	192	.revalidate_disk = nvdimm_revalidate_disk,
9e853f23 RZ	193	};
9e853f23 RZ	194
030b99e3 DW	195	static void pmem_release_queue(void *q)
	196	{
	197	blk_cleanup_queue(q);
	198	}
	199
f02716db	200	static void pmem_release_disk(void *disk)
030b99e3 DW	201	{
	202	del_gendisk(disk);
	203	put_disk(disk);
	204	}
	205
200c79da DW	206	static int pmem_attach_disk(struct device *dev,
200c79da DW	207	struct nd_namespace_common *ndns)
9e853f23	208	{
200c79da	209	struct nd_namespace_io *nsio = to_nd_namespace_io(&ndns->dev);
f284a4f2	210	struct nd_region *nd_region = to_nd_region(dev->parent);
200c79da DW	211	struct vmem_altmap __altmap, *altmap = NULL;
	212	struct resource *res = &nsio->res;
	213	struct nd_pfn *nd_pfn = NULL;
	214	int nid = dev_to_node(dev);
	215	struct nd_pfn_sb *pfn_sb;
9e853f23	216	struct pmem_device *pmem;
200c79da	217	struct resource pfn_res;
468ded03	218	struct request_queue *q;
200c79da DW	219	struct gendisk *disk;
	220	void *addr;
	221
	222	/* while nsio_rw_bytes is active, parse a pfn info block if present */
	223	if (is_nd_pfn(dev)) {
	224	nd_pfn = to_nd_pfn(dev);
	225	altmap = nvdimm_setup_pfn(nd_pfn, &pfn_res, &__altmap);
	226	if (IS_ERR(altmap))
	227	return PTR_ERR(altmap);
	228	}
	229
	230	/* we're attaching a block device, disable raw namespace access */
	231	devm_nsio_disable(dev, nsio);
9e853f23	232
708ab62b	233	pmem = devm_kzalloc(dev, sizeof(*pmem), GFP_KERNEL);
9e853f23	234	if (!pmem)
200c79da	235	return -ENOMEM;
9e853f23	236
200c79da	237	dev_set_drvdata(dev, pmem);
9e853f23 RZ	238	pmem->phys_addr = res->start;
9e853f23 RZ	239	pmem->size = resource_size(res);
f284a4f2	240	if (nvdimm_has_flush(nd_region) < 0)
61031952	241	dev_warn(dev, "unable to guarantee persistence of writes\n");
9e853f23	242
947df02d DW	243	if (!devm_request_mem_region(dev, res->start, resource_size(res),
	244	dev_name(dev))) {
	245	dev_warn(dev, "could not reserve region %pR\n", res);
200c79da	246	return -EBUSY;
9e853f23 RZ	247	}
9e853f23 RZ	248
468ded03 DW	249	q = blk_alloc_queue_node(GFP_KERNEL, dev_to_node(dev));
468ded03 DW	250	if (!q)
200c79da	251	return -ENOMEM;
468ded03	252
34c0fd54	253	pmem->pfn_flags = PFN_DEV;
200c79da DW	254	if (is_nd_pfn(dev)) {
	255	addr = devm_memremap_pages(dev, &pfn_res, &q->q_usage_counter,
	256	altmap);
	257	pfn_sb = nd_pfn->pfn_sb;
	258	pmem->data_offset = le64_to_cpu(pfn_sb->dataoff);
	259	pmem->pfn_pad = resource_size(res) - resource_size(&pfn_res);
	260	pmem->pfn_flags \|= PFN_MAP;
	261	res = &pfn_res; /* for badblocks populate */
	262	res->start += pmem->data_offset;
	263	} else if (pmem_should_map_pages(dev)) {
	264	addr = devm_memremap_pages(dev, &nsio->res,
5c2c2587	265	&q->q_usage_counter, NULL);
34c0fd54 DW	266	pmem->pfn_flags \|= PFN_MAP;
34c0fd54 DW	267	} else
200c79da DW	268	addr = devm_memremap(dev, pmem->phys_addr,
200c79da DW	269	pmem->size, ARCH_MEMREMAP_PMEM);
b36f4761	270
030b99e3 DW	271	/*
	272	* At release time the queue must be dead before
	273	* devm_memremap_pages is unwound
	274	*/
f02716db	275	if (devm_add_action_or_reset(dev, pmem_release_queue, q))
200c79da	276	return -ENOMEM;
8c2f7e86	277
200c79da DW	278	if (IS_ERR(addr))
	279	return PTR_ERR(addr);
	280	pmem->virt_addr = (void __pmem *) addr;
9e853f23	281
5a92289f DW	282	blk_queue_make_request(q, pmem_make_request);
	283	blk_queue_physical_block_size(q, PAGE_SIZE);
	284	blk_queue_max_hw_sectors(q, UINT_MAX);
	285	blk_queue_bounce_limit(q, BLK_BOUNCE_ANY);
	286	queue_flag_set_unlocked(QUEUE_FLAG_NONROT, q);
	287	q->queuedata = pmem;
9e853f23	288
538ea4aa	289	disk = alloc_disk_node(0, nid);
030b99e3 DW	290	if (!disk)
030b99e3 DW	291	return -ENOMEM;
9e853f23	292
9e853f23	293	disk->fops = &pmem_fops;
5a92289f	294	disk->queue = q;
9e853f23	295	disk->flags = GENHD_FL_EXT_DEVT;
5212e11f	296	nvdimm_namespace_disk_name(ndns, disk->disk_name);
32ab0a3f	297	disk->driverfs_dev = dev;
cfe30b87 DW	298	set_capacity(disk, (pmem->size - pmem->pfn_pad - pmem->data_offset)
cfe30b87 DW	299	/ 512);
b95f5f43 DW	300	if (devm_init_badblocks(dev, &pmem->bb))
b95f5f43 DW	301	return -ENOMEM;
f284a4f2	302	nvdimm_badblocks_populate(nd_region, &pmem->bb, res);
57f7f317	303	disk->bb = &pmem->bb;
9e853f23	304	add_disk(disk);
f02716db DW	305
	306	if (devm_add_action_or_reset(dev, pmem_release_disk, disk))
	307	return -ENOMEM;
	308
58138820	309	revalidate_disk(disk);
9e853f23	310
8c2f7e86 DW	311	return 0;
8c2f7e86 DW	312	}
9e853f23	313
9f53f9fa	314	static int nd_pmem_probe(struct device *dev)
9e853f23	315	{
8c2f7e86	316	struct nd_namespace_common *ndns;
9e853f23	317
8c2f7e86 DW	318	ndns = nvdimm_namespace_common_probe(dev);
	319	if (IS_ERR(ndns))
	320	return PTR_ERR(ndns);
bf9bccc1	321
200c79da DW	322	if (devm_nsio_enable(dev, to_nd_namespace_io(&ndns->dev)))
200c79da DW	323	return -ENXIO;
708ab62b	324
200c79da	325	if (is_nd_btt(dev))
708ab62b CH	326	return nvdimm_namespace_attach_btt(ndns);
708ab62b CH	327
32ab0a3f	328	if (is_nd_pfn(dev))
200c79da	329	return pmem_attach_disk(dev, ndns);
32ab0a3f	330
200c79da	331	/* if we find a valid info-block we'll come back as that personality */
c5ed9268 DW	332	if (nd_btt_probe(dev, ndns) == 0 \|\| nd_pfn_probe(dev, ndns) == 0
c5ed9268 DW	333	\|\| nd_dax_probe(dev, ndns) == 0)
32ab0a3f	334	return -ENXIO;
32ab0a3f	335
200c79da DW	336	/* ...otherwise we're just a raw pmem device */
200c79da DW	337	return pmem_attach_disk(dev, ndns);
9e853f23 RZ	338	}
9e853f23 RZ	339
9f53f9fa	340	static int nd_pmem_remove(struct device *dev)
9e853f23	341	{
8c2f7e86	342	if (is_nd_btt(dev))
298f2bc5	343	nvdimm_namespace_detach_btt(to_nd_btt(dev));
9e853f23 RZ	344	return 0;
	345	}
	346
71999466 DW	347	static void nd_pmem_notify(struct device *dev, enum nvdimm_event event)
71999466 DW	348	{
298f2bc5	349	struct pmem_device *pmem = dev_get_drvdata(dev);
f284a4f2	350	struct nd_region *nd_region = to_region(pmem);
298f2bc5 DW	351	resource_size_t offset = 0, end_trunc = 0;
	352	struct nd_namespace_common *ndns;
	353	struct nd_namespace_io *nsio;
	354	struct resource res;
71999466 DW	355
	356	if (event != NVDIMM_REVALIDATE_POISON)
	357	return;
	358
298f2bc5 DW	359	if (is_nd_btt(dev)) {
	360	struct nd_btt *nd_btt = to_nd_btt(dev);
	361
	362	ndns = nd_btt->ndns;
	363	} else if (is_nd_pfn(dev)) {
a3901802 DW	364	struct nd_pfn *nd_pfn = to_nd_pfn(dev);
	365	struct nd_pfn_sb *pfn_sb = nd_pfn->pfn_sb;
	366
298f2bc5 DW	367	ndns = nd_pfn->ndns;
	368	offset = pmem->data_offset + __le32_to_cpu(pfn_sb->start_pad);
	369	end_trunc = __le32_to_cpu(pfn_sb->end_trunc);
	370	} else
	371	ndns = to_ndns(dev);
a3901802	372
298f2bc5 DW	373	nsio = to_nd_namespace_io(&ndns->dev);
	374	res.start = nsio->res.start + offset;
	375	res.end = nsio->res.end - end_trunc;
a3901802	376	nvdimm_badblocks_populate(nd_region, &pmem->bb, &res);
71999466 DW	377	}
71999466 DW	378
9f53f9fa DW	379	MODULE_ALIAS("pmem");
9f53f9fa DW	380	MODULE_ALIAS_ND_DEVICE(ND_DEVICE_NAMESPACE_IO);
bf9bccc1	381	MODULE_ALIAS_ND_DEVICE(ND_DEVICE_NAMESPACE_PMEM);
9f53f9fa DW	382	static struct nd_device_driver nd_pmem_driver = {
	383	.probe = nd_pmem_probe,
	384	.remove = nd_pmem_remove,
71999466	385	.notify = nd_pmem_notify,
9f53f9fa DW	386	.drv = {
9f53f9fa DW	387	.name = "nd_pmem",
9e853f23	388	},
bf9bccc1	389	.type = ND_DRIVER_NAMESPACE_IO \| ND_DRIVER_NAMESPACE_PMEM,
9e853f23 RZ	390	};
	391
	392	static int __init pmem_init(void)
	393	{
55155291	394	return nd_driver_register(&nd_pmem_driver);
9e853f23 RZ	395	}
	396	module_init(pmem_init);
	397
	398	static void pmem_exit(void)
	399	{
9f53f9fa	400	driver_unregister(&nd_pmem_driver.drv);
9e853f23 RZ	401	}
	402	module_exit(pmem_exit);
	403
	404	MODULE_AUTHOR("Ross Zwisler <ross.zwisler@linux.intel.com>");
	405	MODULE_LICENSE("GPL v2");