2015-04-01 07:12:19 +00:00
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/*
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* Persistent Memory Driver
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*
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2015-06-09 19:33:45 +00:00
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* Copyright (c) 2014-2015, Intel Corporation.
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2015-04-01 07:12:19 +00:00
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* Copyright (c) 2015, Christoph Hellwig <hch@lst.de>.
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* Copyright (c) 2015, Boaz Harrosh <boaz@plexistor.com>.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*/
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#include <asm/cacheflush.h>
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#include <linux/blkdev.h>
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#include <linux/hdreg.h>
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#include <linux/init.h>
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#include <linux/platform_device.h>
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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2016-01-05 07:50:23 +00:00
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#include <linux/badblocks.h>
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2016-01-16 00:56:19 +00:00
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#include <linux/memremap.h>
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2015-08-01 06:16:37 +00:00
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#include <linux/vmalloc.h>
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2016-01-16 00:56:14 +00:00
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#include <linux/pfn_t.h>
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2015-04-01 07:12:19 +00:00
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#include <linux/slab.h>
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2015-06-25 07:08:39 +00:00
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#include <linux/pmem.h>
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2015-06-09 19:33:45 +00:00
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#include <linux/nd.h>
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2016-06-17 18:08:06 +00:00
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#include "pmem.h"
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2015-08-01 06:16:37 +00:00
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#include "pfn.h"
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2015-06-09 19:33:45 +00:00
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#include "nd.h"
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2015-04-01 07:12:19 +00:00
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2016-07-08 02:44:50 +00:00
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static struct device *to_dev(struct pmem_device *pmem)
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{
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/*
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* nvdimm bus services need a 'dev' parameter, and we record the device
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* at init in bb.dev.
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*/
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return pmem->bb.dev;
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}
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static struct nd_region *to_region(struct pmem_device *pmem)
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{
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return to_nd_region(to_dev(pmem)->parent);
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}
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2016-03-08 15:16:07 +00:00
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static void pmem_clear_poison(struct pmem_device *pmem, phys_addr_t offset,
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unsigned int len)
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{
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2016-07-08 02:44:50 +00:00
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struct device *dev = to_dev(pmem);
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2016-03-08 15:16:07 +00:00
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sector_t sector;
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long cleared;
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sector = (offset - pmem->data_offset) / 512;
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cleared = nvdimm_clear_poison(dev, pmem->phys_addr + offset, len);
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if (cleared > 0 && cleared / 512) {
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dev_dbg(dev, "%s: %llx clear %ld sector%s\n",
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__func__, (unsigned long long) sector,
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cleared / 512, cleared / 512 > 1 ? "s" : "");
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badblocks_clear(&pmem->bb, sector, cleared / 512);
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}
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invalidate_pmem(pmem->virt_addr + offset, len);
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}
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2016-01-06 20:03:41 +00:00
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static int pmem_do_bvec(struct pmem_device *pmem, struct page *page,
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2015-04-01 07:12:19 +00:00
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unsigned int len, unsigned int off, int rw,
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sector_t sector)
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{
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2016-03-06 23:20:51 +00:00
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int rc = 0;
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2016-03-08 15:16:07 +00:00
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bool bad_pmem = false;
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2015-04-01 07:12:19 +00:00
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void *mem = kmap_atomic(page);
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2015-08-01 06:16:37 +00:00
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phys_addr_t pmem_off = sector * 512 + pmem->data_offset;
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2015-06-25 07:08:39 +00:00
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void __pmem *pmem_addr = pmem->virt_addr + pmem_off;
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2015-04-01 07:12:19 +00:00
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2016-03-08 15:16:07 +00:00
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if (unlikely(is_bad_pmem(&pmem->bb, sector, len)))
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bad_pmem = true;
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2015-04-01 07:12:19 +00:00
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if (rw == READ) {
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2016-03-08 15:16:07 +00:00
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if (unlikely(bad_pmem))
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2016-03-06 23:20:51 +00:00
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rc = -EIO;
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else {
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2016-03-08 18:30:19 +00:00
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rc = memcpy_from_pmem(mem + off, pmem_addr, len);
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2016-03-06 23:20:51 +00:00
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flush_dcache_page(page);
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}
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2015-04-01 07:12:19 +00:00
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} else {
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2016-04-15 02:40:47 +00:00
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/*
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* Note that we write the data both before and after
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* clearing poison. The write before clear poison
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* handles situations where the latest written data is
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* preserved and the clear poison operation simply marks
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* the address range as valid without changing the data.
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* In this case application software can assume that an
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* interrupted write will either return the new good
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* data or an error.
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*
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* However, if pmem_clear_poison() leaves the data in an
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* indeterminate state we need to perform the write
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* after clear poison.
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*/
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2015-04-01 07:12:19 +00:00
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flush_dcache_page(page);
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2015-06-25 07:08:39 +00:00
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memcpy_to_pmem(pmem_addr, mem + off, len);
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2016-03-08 15:16:07 +00:00
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if (unlikely(bad_pmem)) {
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pmem_clear_poison(pmem, pmem_off, len);
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memcpy_to_pmem(pmem_addr, mem + off, len);
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}
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2015-04-01 07:12:19 +00:00
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}
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kunmap_atomic(mem);
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2016-03-06 23:20:51 +00:00
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return rc;
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2015-04-01 07:12:19 +00:00
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}
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2015-11-05 17:41:16 +00:00
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static blk_qc_t pmem_make_request(struct request_queue *q, struct bio *bio)
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2015-04-01 07:12:19 +00:00
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{
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2016-01-06 20:03:41 +00:00
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int rc = 0;
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2015-05-16 16:28:53 +00:00
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bool do_acct;
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unsigned long start;
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2015-04-01 07:12:19 +00:00
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struct bio_vec bvec;
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struct bvec_iter iter;
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2016-03-19 06:47:43 +00:00
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struct pmem_device *pmem = q->queuedata;
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2015-04-01 07:12:19 +00:00
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2015-05-16 16:28:53 +00:00
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do_acct = nd_iostat_start(bio, &start);
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2016-01-06 20:03:41 +00:00
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bio_for_each_segment(bvec, bio, iter) {
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rc = pmem_do_bvec(pmem, bvec.bv_page, bvec.bv_len,
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bvec.bv_offset, bio_data_dir(bio),
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iter.bi_sector);
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if (rc) {
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bio->bi_error = rc;
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break;
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}
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}
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2015-05-16 16:28:53 +00:00
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if (do_acct)
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nd_iostat_end(bio, start);
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2015-06-25 07:08:39 +00:00
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if (bio_data_dir(bio))
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2016-07-08 02:44:50 +00:00
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nvdimm_flush(to_region(pmem));
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2015-06-25 07:08:39 +00:00
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2015-07-20 13:29:37 +00:00
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bio_endio(bio);
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2015-11-05 17:41:16 +00:00
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return BLK_QC_T_NONE;
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2015-04-01 07:12:19 +00:00
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}
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static int pmem_rw_page(struct block_device *bdev, sector_t sector,
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struct page *page, int rw)
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{
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2016-03-19 06:47:43 +00:00
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struct pmem_device *pmem = bdev->bd_queue->queuedata;
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2016-01-06 20:03:41 +00:00
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int rc;
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2015-04-01 07:12:19 +00:00
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mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time
ago with promise that one day it will be possible to implement page
cache with bigger chunks than PAGE_SIZE.
This promise never materialized. And unlikely will.
We have many places where PAGE_CACHE_SIZE assumed to be equal to
PAGE_SIZE. And it's constant source of confusion on whether
PAGE_CACHE_* or PAGE_* constant should be used in a particular case,
especially on the border between fs and mm.
Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much
breakage to be doable.
Let's stop pretending that pages in page cache are special. They are
not.
The changes are pretty straight-forward:
- <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN};
- page_cache_get() -> get_page();
- page_cache_release() -> put_page();
This patch contains automated changes generated with coccinelle using
script below. For some reason, coccinelle doesn't patch header files.
I've called spatch for them manually.
The only adjustment after coccinelle is revert of changes to
PAGE_CAHCE_ALIGN definition: we are going to drop it later.
There are few places in the code where coccinelle didn't reach. I'll
fix them manually in a separate patch. Comments and documentation also
will be addressed with the separate patch.
virtual patch
@@
expression E;
@@
- E << (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
expression E;
@@
- E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
@@
- PAGE_CACHE_SHIFT
+ PAGE_SHIFT
@@
@@
- PAGE_CACHE_SIZE
+ PAGE_SIZE
@@
@@
- PAGE_CACHE_MASK
+ PAGE_MASK
@@
expression E;
@@
- PAGE_CACHE_ALIGN(E)
+ PAGE_ALIGN(E)
@@
expression E;
@@
- page_cache_get(E)
+ get_page(E)
@@
expression E;
@@
- page_cache_release(E)
+ put_page(E)
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-04-01 12:29:47 +00:00
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rc = pmem_do_bvec(pmem, page, PAGE_SIZE, 0, rw, sector);
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2015-09-16 20:52:21 +00:00
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if (rw & WRITE)
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2016-07-08 02:44:50 +00:00
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nvdimm_flush(to_region(pmem));
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2015-04-01 07:12:19 +00:00
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2016-01-06 20:03:41 +00:00
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/*
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* The ->rw_page interface is subtle and tricky. The core
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* retries on any error, so we can only invoke page_endio() in
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* the successful completion case. Otherwise, we'll see crashes
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* caused by double completion.
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*/
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if (rc == 0)
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page_endio(page, rw & WRITE, 0);
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return rc;
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2015-04-01 07:12:19 +00:00
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}
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2016-06-17 18:08:06 +00:00
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/* see "strong" declaration in tools/testing/nvdimm/pmem-dax.c */
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__weak long pmem_direct_access(struct block_device *bdev, sector_t sector,
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2016-02-24 22:02:11 +00:00
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void __pmem **kaddr, pfn_t *pfn, long size)
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2015-04-01 07:12:19 +00:00
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{
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2016-03-19 06:47:43 +00:00
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struct pmem_device *pmem = bdev->bd_queue->queuedata;
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2015-08-01 06:16:37 +00:00
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resource_size_t offset = sector * 512 + pmem->data_offset;
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2015-10-25 02:55:58 +00:00
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2016-02-24 22:02:11 +00:00
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if (unlikely(is_bad_pmem(&pmem->bb, sector, size)))
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return -EIO;
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2015-08-18 19:55:41 +00:00
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*kaddr = pmem->virt_addr + offset;
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2016-01-16 00:56:14 +00:00
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*pfn = phys_to_pfn_t(pmem->phys_addr + offset, pmem->pfn_flags);
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2015-04-01 07:12:19 +00:00
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2016-02-24 22:02:11 +00:00
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/*
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* If badblocks are present, limit known good range to the
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* requested range.
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*/
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if (unlikely(pmem->bb.count))
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return size;
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2016-03-03 17:38:00 +00:00
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return pmem->size - pmem->pfn_pad - offset;
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2015-04-01 07:12:19 +00:00
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}
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static const struct block_device_operations pmem_fops = {
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.owner = THIS_MODULE,
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.rw_page = pmem_rw_page,
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.direct_access = pmem_direct_access,
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2015-06-24 00:08:34 +00:00
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.revalidate_disk = nvdimm_revalidate_disk,
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2015-04-01 07:12:19 +00:00
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};
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2016-03-18 03:24:31 +00:00
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static void pmem_release_queue(void *q)
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{
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blk_cleanup_queue(q);
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}
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2016-06-15 21:59:17 +00:00
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static void pmem_release_disk(void *disk)
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2016-03-18 03:24:31 +00:00
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{
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del_gendisk(disk);
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put_disk(disk);
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}
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2016-03-22 07:22:16 +00:00
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static int pmem_attach_disk(struct device *dev,
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struct nd_namespace_common *ndns)
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2015-04-01 07:12:19 +00:00
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{
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2016-03-22 07:22:16 +00:00
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struct nd_namespace_io *nsio = to_nd_namespace_io(&ndns->dev);
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2016-07-08 02:44:50 +00:00
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struct nd_region *nd_region = to_nd_region(dev->parent);
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2016-03-22 07:22:16 +00:00
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struct vmem_altmap __altmap, *altmap = NULL;
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struct resource *res = &nsio->res;
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struct nd_pfn *nd_pfn = NULL;
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int nid = dev_to_node(dev);
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struct nd_pfn_sb *pfn_sb;
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2015-04-01 07:12:19 +00:00
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struct pmem_device *pmem;
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2016-03-22 07:22:16 +00:00
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struct resource pfn_res;
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2016-01-16 00:56:46 +00:00
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struct request_queue *q;
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2016-03-22 07:22:16 +00:00
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struct gendisk *disk;
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void *addr;
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/* while nsio_rw_bytes is active, parse a pfn info block if present */
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if (is_nd_pfn(dev)) {
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nd_pfn = to_nd_pfn(dev);
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altmap = nvdimm_setup_pfn(nd_pfn, &pfn_res, &__altmap);
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if (IS_ERR(altmap))
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return PTR_ERR(altmap);
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}
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/* we're attaching a block device, disable raw namespace access */
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devm_nsio_disable(dev, nsio);
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2015-04-01 07:12:19 +00:00
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2015-08-11 03:07:08 +00:00
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pmem = devm_kzalloc(dev, sizeof(*pmem), GFP_KERNEL);
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2015-04-01 07:12:19 +00:00
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if (!pmem)
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2016-03-22 07:22:16 +00:00
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return -ENOMEM;
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2015-04-01 07:12:19 +00:00
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2016-03-22 07:22:16 +00:00
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dev_set_drvdata(dev, pmem);
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2015-04-01 07:12:19 +00:00
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pmem->phys_addr = res->start;
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pmem->size = resource_size(res);
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2016-07-08 02:44:50 +00:00
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if (nvdimm_has_flush(nd_region) < 0)
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2015-06-25 07:08:39 +00:00
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dev_warn(dev, "unable to guarantee persistence of writes\n");
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2015-04-01 07:12:19 +00:00
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2016-03-22 05:28:40 +00:00
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if (!devm_request_mem_region(dev, res->start, resource_size(res),
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dev_name(dev))) {
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dev_warn(dev, "could not reserve region %pR\n", res);
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2016-03-22 07:22:16 +00:00
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return -EBUSY;
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2015-04-01 07:12:19 +00:00
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}
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2016-01-16 00:56:46 +00:00
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q = blk_alloc_queue_node(GFP_KERNEL, dev_to_node(dev));
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if (!q)
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2016-03-22 07:22:16 +00:00
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return -ENOMEM;
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2016-01-16 00:56:46 +00:00
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2016-01-16 00:56:14 +00:00
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pmem->pfn_flags = PFN_DEV;
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2016-03-22 07:22:16 +00:00
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|
|
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,
|
2016-01-16 00:56:49 +00:00
|
|
|
&q->q_usage_counter, NULL);
|
2016-01-16 00:56:14 +00:00
|
|
|
pmem->pfn_flags |= PFN_MAP;
|
|
|
|
} else
|
2016-03-22 07:22:16 +00:00
|
|
|
addr = devm_memremap(dev, pmem->phys_addr,
|
|
|
|
pmem->size, ARCH_MEMREMAP_PMEM);
|
2015-09-15 06:42:20 +00:00
|
|
|
|
2016-03-18 03:24:31 +00:00
|
|
|
/*
|
|
|
|
* At release time the queue must be dead before
|
|
|
|
* devm_memremap_pages is unwound
|
|
|
|
*/
|
2016-06-15 21:59:17 +00:00
|
|
|
if (devm_add_action_or_reset(dev, pmem_release_queue, q))
|
2016-03-22 07:22:16 +00:00
|
|
|
return -ENOMEM;
|
2015-06-25 08:20:04 +00:00
|
|
|
|
2016-03-22 07:22:16 +00:00
|
|
|
if (IS_ERR(addr))
|
|
|
|
return PTR_ERR(addr);
|
|
|
|
pmem->virt_addr = (void __pmem *) addr;
|
2015-04-01 07:12:19 +00:00
|
|
|
|
2016-03-21 22:43:53 +00:00
|
|
|
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;
|
2015-04-01 07:12:19 +00:00
|
|
|
|
2015-10-06 00:35:56 +00:00
|
|
|
disk = alloc_disk_node(0, nid);
|
2016-03-18 03:24:31 +00:00
|
|
|
if (!disk)
|
|
|
|
return -ENOMEM;
|
2015-04-01 07:12:19 +00:00
|
|
|
|
|
|
|
disk->fops = &pmem_fops;
|
2016-03-21 22:43:53 +00:00
|
|
|
disk->queue = q;
|
2015-04-01 07:12:19 +00:00
|
|
|
disk->flags = GENHD_FL_EXT_DEVT;
|
nd_btt: atomic sector updates
BTT stands for Block Translation Table, and is a way to provide power
fail sector atomicity semantics for block devices that have the ability
to perform byte granularity IO. It relies on the capability of libnvdimm
namespace devices to do byte aligned IO.
The BTT works as a stacked blocked device, and reserves a chunk of space
from the backing device for its accounting metadata. It is a bio-based
driver because all IO is done synchronously, and there is no queuing or
asynchronous completions at either the device or the driver level.
The BTT uses 'lanes' to index into various 'on-disk' data structures,
and lanes also act as a synchronization mechanism in case there are more
CPUs than available lanes. We did a comparison between two lane lock
strategies - first where we kept an atomic counter around that tracked
which was the last lane that was used, and 'our' lane was determined by
atomically incrementing that. That way, for the nr_cpus > nr_lanes case,
theoretically, no CPU would be blocked waiting for a lane. The other
strategy was to use the cpu number we're scheduled on to and hash it to
a lane number. Theoretically, this could block an IO that could've
otherwise run using a different, free lane. But some fio workloads
showed that the direct cpu -> lane hash performed faster than tracking
'last lane' - my reasoning is the cache thrash caused by moving the
atomic variable made that approach slower than simply waiting out the
in-progress IO. This supports the conclusion that the driver can be a
very simple bio-based one that does synchronous IOs instead of queuing.
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Boaz Harrosh <boaz@plexistor.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Jens Axboe <axboe@fb.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Neil Brown <neilb@suse.de>
Cc: Jeff Moyer <jmoyer@redhat.com>
Cc: Dave Chinner <david@fromorbit.com>
Cc: Greg KH <gregkh@linuxfoundation.org>
[jmoyer: fix nmi watchdog timeout in btt_map_init]
[jmoyer: move btt initialization to module load path]
[jmoyer: fix memory leak in the btt initialization path]
[jmoyer: Don't overwrite corrupted arenas]
Signed-off-by: Vishal Verma <vishal.l.verma@linux.intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2015-06-25 08:20:32 +00:00
|
|
|
nvdimm_namespace_disk_name(ndns, disk->disk_name);
|
2015-08-01 06:16:37 +00:00
|
|
|
disk->driverfs_dev = dev;
|
2016-03-03 17:38:00 +00:00
|
|
|
set_capacity(disk, (pmem->size - pmem->pfn_pad - pmem->data_offset)
|
|
|
|
/ 512);
|
2016-01-05 07:50:23 +00:00
|
|
|
if (devm_init_badblocks(dev, &pmem->bb))
|
|
|
|
return -ENOMEM;
|
2016-07-08 02:44:50 +00:00
|
|
|
nvdimm_badblocks_populate(nd_region, &pmem->bb, res);
|
2016-01-06 20:03:42 +00:00
|
|
|
disk->bb = &pmem->bb;
|
2015-04-01 07:12:19 +00:00
|
|
|
add_disk(disk);
|
2016-06-15 21:59:17 +00:00
|
|
|
|
|
|
|
if (devm_add_action_or_reset(dev, pmem_release_disk, disk))
|
|
|
|
return -ENOMEM;
|
|
|
|
|
2015-06-24 00:08:34 +00:00
|
|
|
revalidate_disk(disk);
|
2015-04-01 07:12:19 +00:00
|
|
|
|
2015-06-25 08:20:04 +00:00
|
|
|
return 0;
|
|
|
|
}
|
2015-04-01 07:12:19 +00:00
|
|
|
|
2015-06-09 19:33:45 +00:00
|
|
|
static int nd_pmem_probe(struct device *dev)
|
2015-04-01 07:12:19 +00:00
|
|
|
{
|
2015-06-25 08:20:04 +00:00
|
|
|
struct nd_namespace_common *ndns;
|
2015-04-01 07:12:19 +00:00
|
|
|
|
2015-06-25 08:20:04 +00:00
|
|
|
ndns = nvdimm_namespace_common_probe(dev);
|
|
|
|
if (IS_ERR(ndns))
|
|
|
|
return PTR_ERR(ndns);
|
2015-06-17 21:14:46 +00:00
|
|
|
|
2016-03-22 07:22:16 +00:00
|
|
|
if (devm_nsio_enable(dev, to_nd_namespace_io(&ndns->dev)))
|
|
|
|
return -ENXIO;
|
2015-08-11 03:07:08 +00:00
|
|
|
|
2016-03-22 07:22:16 +00:00
|
|
|
if (is_nd_btt(dev))
|
2015-08-11 03:07:08 +00:00
|
|
|
return nvdimm_namespace_attach_btt(ndns);
|
|
|
|
|
2015-08-01 06:16:37 +00:00
|
|
|
if (is_nd_pfn(dev))
|
2016-03-22 07:22:16 +00:00
|
|
|
return pmem_attach_disk(dev, ndns);
|
2015-08-01 06:16:37 +00:00
|
|
|
|
2016-03-22 07:22:16 +00:00
|
|
|
/* if we find a valid info-block we'll come back as that personality */
|
2016-05-18 21:50:12 +00:00
|
|
|
if (nd_btt_probe(dev, ndns) == 0 || nd_pfn_probe(dev, ndns) == 0
|
|
|
|
|| nd_dax_probe(dev, ndns) == 0)
|
2015-08-01 06:16:37 +00:00
|
|
|
return -ENXIO;
|
|
|
|
|
2016-03-22 07:22:16 +00:00
|
|
|
/* ...otherwise we're just a raw pmem device */
|
|
|
|
return pmem_attach_disk(dev, ndns);
|
2015-04-01 07:12:19 +00:00
|
|
|
}
|
|
|
|
|
2015-06-09 19:33:45 +00:00
|
|
|
static int nd_pmem_remove(struct device *dev)
|
2015-04-01 07:12:19 +00:00
|
|
|
{
|
2015-06-25 08:20:04 +00:00
|
|
|
if (is_nd_btt(dev))
|
2016-03-15 23:41:04 +00:00
|
|
|
nvdimm_namespace_detach_btt(to_nd_btt(dev));
|
2015-04-01 07:12:19 +00:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2016-02-18 18:29:49 +00:00
|
|
|
static void nd_pmem_notify(struct device *dev, enum nvdimm_event event)
|
|
|
|
{
|
2016-03-15 23:41:04 +00:00
|
|
|
struct pmem_device *pmem = dev_get_drvdata(dev);
|
2016-07-08 02:44:50 +00:00
|
|
|
struct nd_region *nd_region = to_region(pmem);
|
2016-03-15 23:41:04 +00:00
|
|
|
resource_size_t offset = 0, end_trunc = 0;
|
|
|
|
struct nd_namespace_common *ndns;
|
|
|
|
struct nd_namespace_io *nsio;
|
|
|
|
struct resource res;
|
2016-02-18 18:29:49 +00:00
|
|
|
|
|
|
|
if (event != NVDIMM_REVALIDATE_POISON)
|
|
|
|
return;
|
|
|
|
|
2016-03-15 23:41:04 +00:00
|
|
|
if (is_nd_btt(dev)) {
|
|
|
|
struct nd_btt *nd_btt = to_nd_btt(dev);
|
|
|
|
|
|
|
|
ndns = nd_btt->ndns;
|
|
|
|
} else if (is_nd_pfn(dev)) {
|
2016-04-08 03:02:06 +00:00
|
|
|
struct nd_pfn *nd_pfn = to_nd_pfn(dev);
|
|
|
|
struct nd_pfn_sb *pfn_sb = nd_pfn->pfn_sb;
|
|
|
|
|
2016-03-15 23:41:04 +00:00
|
|
|
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);
|
2016-04-08 03:02:06 +00:00
|
|
|
|
2016-03-15 23:41:04 +00:00
|
|
|
nsio = to_nd_namespace_io(&ndns->dev);
|
|
|
|
res.start = nsio->res.start + offset;
|
|
|
|
res.end = nsio->res.end - end_trunc;
|
2016-04-08 03:02:06 +00:00
|
|
|
nvdimm_badblocks_populate(nd_region, &pmem->bb, &res);
|
2016-02-18 18:29:49 +00:00
|
|
|
}
|
|
|
|
|
2015-06-09 19:33:45 +00:00
|
|
|
MODULE_ALIAS("pmem");
|
|
|
|
MODULE_ALIAS_ND_DEVICE(ND_DEVICE_NAMESPACE_IO);
|
2015-06-17 21:14:46 +00:00
|
|
|
MODULE_ALIAS_ND_DEVICE(ND_DEVICE_NAMESPACE_PMEM);
|
2015-06-09 19:33:45 +00:00
|
|
|
static struct nd_device_driver nd_pmem_driver = {
|
|
|
|
.probe = nd_pmem_probe,
|
|
|
|
.remove = nd_pmem_remove,
|
2016-02-18 18:29:49 +00:00
|
|
|
.notify = nd_pmem_notify,
|
2015-06-09 19:33:45 +00:00
|
|
|
.drv = {
|
|
|
|
.name = "nd_pmem",
|
2015-04-01 07:12:19 +00:00
|
|
|
},
|
2015-06-17 21:14:46 +00:00
|
|
|
.type = ND_DRIVER_NAMESPACE_IO | ND_DRIVER_NAMESPACE_PMEM,
|
2015-04-01 07:12:19 +00:00
|
|
|
};
|
|
|
|
|
|
|
|
static int __init pmem_init(void)
|
|
|
|
{
|
2016-03-08 22:21:54 +00:00
|
|
|
return nd_driver_register(&nd_pmem_driver);
|
2015-04-01 07:12:19 +00:00
|
|
|
}
|
|
|
|
module_init(pmem_init);
|
|
|
|
|
|
|
|
static void pmem_exit(void)
|
|
|
|
{
|
2015-06-09 19:33:45 +00:00
|
|
|
driver_unregister(&nd_pmem_driver.drv);
|
2015-04-01 07:12:19 +00:00
|
|
|
}
|
|
|
|
module_exit(pmem_exit);
|
|
|
|
|
|
|
|
MODULE_AUTHOR("Ross Zwisler <ross.zwisler@linux.intel.com>");
|
|
|
|
MODULE_LICENSE("GPL v2");
|