2019-05-29 17:18:02 +03:00
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// SPDX-License-Identifier: GPL-2.0-only
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2015-06-25 11:21:02 +03:00
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/*
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* NVDIMM Block Window Driver
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* Copyright (c) 2014, Intel Corporation.
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*/
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#include <linux/blkdev.h>
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#include <linux/fs.h>
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#include <linux/genhd.h>
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/nd.h>
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#include <linux/sizes.h>
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#include "nd.h"
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2016-03-18 21:27:36 +03:00
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static u32 nsblk_meta_size(struct nd_namespace_blk *nsblk)
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{
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return nsblk->lbasize - ((nsblk->lbasize >= 4096) ? 4096 : 512);
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}
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2015-06-25 11:21:02 +03:00
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2016-03-18 21:27:36 +03:00
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static u32 nsblk_internal_lbasize(struct nd_namespace_blk *nsblk)
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2015-06-25 11:22:39 +03:00
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{
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2016-03-18 21:27:36 +03:00
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return roundup(nsblk->lbasize, INT_LBASIZE_ALIGNMENT);
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}
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static u32 nsblk_sector_size(struct nd_namespace_blk *nsblk)
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{
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return nsblk->lbasize - nsblk_meta_size(nsblk);
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2015-06-25 11:22:39 +03:00
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}
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2015-06-25 11:21:02 +03:00
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static resource_size_t to_dev_offset(struct nd_namespace_blk *nsblk,
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resource_size_t ns_offset, unsigned int len)
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{
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int i;
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for (i = 0; i < nsblk->num_resources; i++) {
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if (ns_offset < resource_size(nsblk->res[i])) {
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if (ns_offset + len > resource_size(nsblk->res[i])) {
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dev_WARN_ONCE(&nsblk->common.dev, 1,
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"illegal request\n");
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return SIZE_MAX;
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}
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return nsblk->res[i]->start + ns_offset;
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}
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ns_offset -= resource_size(nsblk->res[i]);
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}
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dev_WARN_ONCE(&nsblk->common.dev, 1, "request out of range\n");
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return SIZE_MAX;
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}
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2016-03-18 21:27:36 +03:00
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static struct nd_blk_region *to_ndbr(struct nd_namespace_blk *nsblk)
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{
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struct nd_region *nd_region;
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struct device *parent;
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parent = nsblk->common.dev.parent;
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nd_region = container_of(parent, struct nd_region, dev);
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return container_of(nd_region, struct nd_blk_region, nd_region);
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}
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2015-06-25 11:22:39 +03:00
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#ifdef CONFIG_BLK_DEV_INTEGRITY
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2016-03-18 21:27:36 +03:00
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static int nd_blk_rw_integrity(struct nd_namespace_blk *nsblk,
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struct bio_integrity_payload *bip, u64 lba, int rw)
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2015-06-25 11:22:39 +03:00
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{
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2016-03-18 21:27:36 +03:00
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struct nd_blk_region *ndbr = to_ndbr(nsblk);
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unsigned int len = nsblk_meta_size(nsblk);
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2015-06-25 11:22:39 +03:00
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resource_size_t dev_offset, ns_offset;
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2016-03-18 21:27:36 +03:00
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u32 internal_lbasize, sector_size;
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2015-06-25 11:22:39 +03:00
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int err = 0;
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2016-03-18 21:27:36 +03:00
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internal_lbasize = nsblk_internal_lbasize(nsblk);
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sector_size = nsblk_sector_size(nsblk);
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ns_offset = lba * internal_lbasize + sector_size;
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2015-06-25 11:22:39 +03:00
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dev_offset = to_dev_offset(nsblk, ns_offset, len);
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if (dev_offset == SIZE_MAX)
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return -EIO;
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while (len) {
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unsigned int cur_len;
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struct bio_vec bv;
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void *iobuf;
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bv = bvec_iter_bvec(bip->bip_vec, bip->bip_iter);
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/*
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* The 'bv' obtained from bvec_iter_bvec has its .bv_len and
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* .bv_offset already adjusted for iter->bi_bvec_done, and we
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* can use those directly
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*/
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cur_len = min(len, bv.bv_len);
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iobuf = kmap_atomic(bv.bv_page);
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err = ndbr->do_io(ndbr, dev_offset, iobuf + bv.bv_offset,
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cur_len, rw);
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kunmap_atomic(iobuf);
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if (err)
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return err;
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len -= cur_len;
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dev_offset += cur_len;
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2017-06-29 21:31:13 +03:00
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if (!bvec_iter_advance(bip->bip_vec, &bip->bip_iter, cur_len))
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return -EIO;
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2015-06-25 11:22:39 +03:00
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}
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return err;
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}
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#else /* CONFIG_BLK_DEV_INTEGRITY */
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2016-03-18 21:27:36 +03:00
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static int nd_blk_rw_integrity(struct nd_namespace_blk *nsblk,
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struct bio_integrity_payload *bip, u64 lba, int rw)
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2015-06-25 11:22:39 +03:00
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{
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return 0;
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}
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#endif
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2016-03-18 21:27:36 +03:00
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static int nsblk_do_bvec(struct nd_namespace_blk *nsblk,
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struct bio_integrity_payload *bip, struct page *page,
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unsigned int len, unsigned int off, int rw, sector_t sector)
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2015-06-25 11:22:39 +03:00
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{
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2016-03-18 21:27:36 +03:00
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struct nd_blk_region *ndbr = to_ndbr(nsblk);
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2015-06-25 11:22:39 +03:00
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resource_size_t dev_offset, ns_offset;
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2016-03-18 21:27:36 +03:00
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u32 internal_lbasize, sector_size;
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2015-06-25 11:22:39 +03:00
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int err = 0;
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void *iobuf;
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u64 lba;
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2016-03-18 21:27:36 +03:00
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internal_lbasize = nsblk_internal_lbasize(nsblk);
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sector_size = nsblk_sector_size(nsblk);
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2015-06-25 11:22:39 +03:00
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while (len) {
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unsigned int cur_len;
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/*
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* If we don't have an integrity payload, we don't have to
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* split the bvec into sectors, as this would cause unnecessary
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* Block Window setup/move steps. the do_io routine is capable
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* of handling len <= PAGE_SIZE.
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*/
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2016-03-18 21:27:36 +03:00
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cur_len = bip ? min(len, sector_size) : len;
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2015-06-25 11:22:39 +03:00
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2016-03-18 21:27:36 +03:00
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lba = div_u64(sector << SECTOR_SHIFT, sector_size);
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ns_offset = lba * internal_lbasize;
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dev_offset = to_dev_offset(nsblk, ns_offset, cur_len);
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2015-06-25 11:22:39 +03:00
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if (dev_offset == SIZE_MAX)
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return -EIO;
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iobuf = kmap_atomic(page);
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err = ndbr->do_io(ndbr, dev_offset, iobuf + off, cur_len, rw);
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kunmap_atomic(iobuf);
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if (err)
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return err;
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if (bip) {
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2016-03-18 21:27:36 +03:00
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err = nd_blk_rw_integrity(nsblk, bip, lba, rw);
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2015-06-25 11:22:39 +03:00
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if (err)
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return err;
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}
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len -= cur_len;
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off += cur_len;
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2016-03-18 21:27:36 +03:00
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sector += sector_size >> SECTOR_SHIFT;
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2015-06-25 11:22:39 +03:00
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}
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return err;
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}
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2015-11-05 20:41:16 +03:00
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static blk_qc_t nd_blk_make_request(struct request_queue *q, struct bio *bio)
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2015-06-25 11:21:02 +03:00
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{
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2015-06-25 11:22:39 +03:00
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struct bio_integrity_payload *bip;
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2020-05-08 19:15:15 +03:00
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struct nd_namespace_blk *nsblk = bio->bi_disk->private_data;
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2015-06-25 11:21:02 +03:00
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struct bvec_iter iter;
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2015-05-16 19:28:53 +03:00
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unsigned long start;
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2015-06-25 11:21:02 +03:00
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struct bio_vec bvec;
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int err = 0, rw;
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2015-05-16 19:28:53 +03:00
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bool do_acct;
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2015-06-25 11:21:02 +03:00
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2017-06-29 21:31:11 +03:00
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if (!bio_integrity_prep(bio))
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return BLK_QC_T_NONE;
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2015-06-25 11:22:39 +03:00
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bip = bio_integrity(bio);
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2015-06-25 11:21:02 +03:00
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rw = bio_data_dir(bio);
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2020-05-27 08:24:10 +03:00
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do_acct = blk_queue_io_stat(bio->bi_disk->queue);
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if (do_acct)
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start = bio_start_io_acct(bio);
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2015-06-25 11:21:02 +03:00
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bio_for_each_segment(bvec, bio, iter) {
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unsigned int len = bvec.bv_len;
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BUG_ON(len > PAGE_SIZE);
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2016-03-18 21:27:36 +03:00
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err = nsblk_do_bvec(nsblk, bip, bvec.bv_page, len,
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bvec.bv_offset, rw, iter.bi_sector);
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2015-06-25 11:22:39 +03:00
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if (err) {
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2016-03-18 21:27:36 +03:00
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dev_dbg(&nsblk->common.dev,
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2015-06-25 11:22:39 +03:00
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"io error in %s sector %lld, len %d,\n",
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(rw == READ) ? "READ" : "WRITE",
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(unsigned long long) iter.bi_sector, len);
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2017-06-03 10:38:06 +03:00
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bio->bi_status = errno_to_blk_status(err);
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2015-05-16 19:28:53 +03:00
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break;
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2015-06-25 11:21:02 +03:00
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}
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}
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2015-05-16 19:28:53 +03:00
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if (do_acct)
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2020-05-27 08:24:10 +03:00
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bio_end_io_acct(bio, start);
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2015-06-25 11:21:02 +03:00
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2015-07-20 16:29:37 +03:00
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bio_endio(bio);
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2015-11-05 20:41:16 +03:00
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return BLK_QC_T_NONE;
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2015-06-25 11:21:02 +03:00
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}
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2016-03-18 21:27:36 +03:00
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static int nsblk_rw_bytes(struct nd_namespace_common *ndns,
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2017-05-11 00:01:30 +03:00
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resource_size_t offset, void *iobuf, size_t n, int rw,
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unsigned long flags)
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2015-06-25 11:21:02 +03:00
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{
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2016-03-18 21:27:36 +03:00
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struct nd_namespace_blk *nsblk = to_nd_namespace_blk(&ndns->dev);
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struct nd_blk_region *ndbr = to_ndbr(nsblk);
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2015-06-25 11:21:02 +03:00
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resource_size_t dev_offset;
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dev_offset = to_dev_offset(nsblk, offset, n);
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2016-03-18 21:27:36 +03:00
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if (unlikely(offset + n > nsblk->size)) {
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2015-06-25 11:21:02 +03:00
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dev_WARN_ONCE(&ndns->dev, 1, "request out of range\n");
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return -EFAULT;
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}
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if (dev_offset == SIZE_MAX)
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return -EIO;
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return ndbr->do_io(ndbr, dev_offset, iobuf, n, rw);
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}
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static const struct block_device_operations nd_blk_fops = {
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.owner = THIS_MODULE,
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2015-06-24 03:08:34 +03:00
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.revalidate_disk = nvdimm_revalidate_disk,
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2015-06-25 11:21:02 +03:00
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};
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2016-03-18 06:08:28 +03:00
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static void nd_blk_release_queue(void *q)
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{
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blk_cleanup_queue(q);
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}
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static void nd_blk_release_disk(void *disk)
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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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2016-03-18 21:27:36 +03:00
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static int nsblk_attach_disk(struct nd_namespace_blk *nsblk)
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2015-06-25 11:21:02 +03:00
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{
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2016-03-18 21:27:36 +03:00
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struct device *dev = &nsblk->common.dev;
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2015-06-25 11:22:39 +03:00
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resource_size_t available_disk_size;
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2016-03-18 06:08:28 +03:00
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struct request_queue *q;
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2015-06-25 11:21:02 +03:00
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struct gendisk *disk;
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2015-06-25 11:22:39 +03:00
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u64 internal_nlba;
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2016-03-18 21:27:36 +03:00
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internal_nlba = div_u64(nsblk->size, nsblk_internal_lbasize(nsblk));
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available_disk_size = internal_nlba * nsblk_sector_size(nsblk);
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2015-06-25 11:21:02 +03:00
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2020-03-27 11:30:11 +03:00
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q = blk_alloc_queue(nd_blk_make_request, NUMA_NO_NODE);
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2016-03-18 06:08:28 +03:00
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if (!q)
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return -ENOMEM;
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2016-06-16 00:59:17 +03:00
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if (devm_add_action_or_reset(dev, nd_blk_release_queue, q))
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2015-06-25 11:21:02 +03:00
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return -ENOMEM;
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2016-03-18 06:08:28 +03:00
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blk_queue_max_hw_sectors(q, UINT_MAX);
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2016-03-18 21:27:36 +03:00
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blk_queue_logical_block_size(q, nsblk_sector_size(nsblk));
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2018-03-08 04:10:10 +03:00
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blk_queue_flag_set(QUEUE_FLAG_NONROT, q);
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2015-06-25 11:21:02 +03:00
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2016-03-18 06:08:28 +03:00
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disk = alloc_disk(0);
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if (!disk)
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return -ENOMEM;
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2015-06-25 11:21:02 +03:00
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disk->first_minor = 0;
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disk->fops = &nd_blk_fops;
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2016-03-18 06:08:28 +03:00
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disk->queue = q;
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2015-06-25 11:21:02 +03:00
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disk->flags = GENHD_FL_EXT_DEVT;
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2020-05-08 19:15:15 +03:00
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disk->private_data = nsblk;
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2016-03-18 21:27:36 +03:00
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nvdimm_namespace_disk_name(&nsblk->common, disk->disk_name);
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2015-06-25 11:21:02 +03:00
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2016-06-16 00:59:17 +03:00
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if (devm_add_action_or_reset(dev, nd_blk_release_disk, disk))
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return -ENOMEM;
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2016-03-18 21:27:36 +03:00
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if (nsblk_meta_size(nsblk)) {
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int rc = nd_integrity_init(disk, nsblk_meta_size(nsblk));
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2015-06-25 11:22:39 +03:00
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2016-03-18 06:08:28 +03:00
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if (rc)
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2015-06-25 11:22:39 +03:00
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return rc;
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}
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set_capacity(disk, available_disk_size >> SECTOR_SHIFT);
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2018-09-28 09:17:19 +03:00
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device_add_disk(dev, disk, NULL);
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2015-06-24 03:08:34 +03:00
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revalidate_disk(disk);
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2015-06-25 11:21:02 +03:00
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return 0;
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}
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|
|
static int nd_blk_probe(struct device *dev)
|
|
|
|
{
|
|
|
|
struct nd_namespace_common *ndns;
|
2015-06-25 11:22:39 +03:00
|
|
|
struct nd_namespace_blk *nsblk;
|
2015-06-25 11:21:02 +03:00
|
|
|
|
|
|
|
ndns = nvdimm_namespace_common_probe(dev);
|
|
|
|
if (IS_ERR(ndns))
|
|
|
|
return PTR_ERR(ndns);
|
|
|
|
|
2015-06-25 11:22:39 +03:00
|
|
|
nsblk = to_nd_namespace_blk(&ndns->dev);
|
2016-03-18 21:27:36 +03:00
|
|
|
nsblk->size = nvdimm_namespace_capacity(ndns);
|
|
|
|
dev_set_drvdata(dev, nsblk);
|
|
|
|
|
|
|
|
ndns->rw_bytes = nsblk_rw_bytes;
|
2015-06-25 11:21:02 +03:00
|
|
|
if (is_nd_btt(dev))
|
2016-03-18 06:08:28 +03:00
|
|
|
return nvdimm_namespace_attach_btt(ndns);
|
2016-03-22 10:22:16 +03:00
|
|
|
else if (nd_btt_probe(dev, ndns) == 0) {
|
2015-06-25 11:21:02 +03:00
|
|
|
/* we'll come back as btt-blk */
|
2016-03-18 06:08:28 +03:00
|
|
|
return -ENXIO;
|
2015-06-25 11:21:02 +03:00
|
|
|
} else
|
2016-03-18 21:27:36 +03:00
|
|
|
return nsblk_attach_disk(nsblk);
|
2015-06-25 11:21:02 +03:00
|
|
|
}
|
|
|
|
|
|
|
|
static int nd_blk_remove(struct device *dev)
|
|
|
|
{
|
|
|
|
if (is_nd_btt(dev))
|
2016-03-16 02:41:04 +03:00
|
|
|
nvdimm_namespace_detach_btt(to_nd_btt(dev));
|
2015-06-25 11:21:02 +03:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct nd_device_driver nd_blk_driver = {
|
|
|
|
.probe = nd_blk_probe,
|
|
|
|
.remove = nd_blk_remove,
|
|
|
|
.drv = {
|
|
|
|
.name = "nd_blk",
|
|
|
|
},
|
|
|
|
.type = ND_DRIVER_NAMESPACE_BLK,
|
|
|
|
};
|
|
|
|
|
|
|
|
static int __init nd_blk_init(void)
|
|
|
|
{
|
2016-03-10 00:59:28 +03:00
|
|
|
return nd_driver_register(&nd_blk_driver);
|
2015-06-25 11:21:02 +03:00
|
|
|
}
|
|
|
|
|
|
|
|
static void __exit nd_blk_exit(void)
|
|
|
|
{
|
|
|
|
driver_unregister(&nd_blk_driver.drv);
|
|
|
|
}
|
|
|
|
|
|
|
|
MODULE_AUTHOR("Ross Zwisler <ross.zwisler@linux.intel.com>");
|
|
|
|
MODULE_LICENSE("GPL v2");
|
|
|
|
MODULE_ALIAS_ND_DEVICE(ND_DEVICE_NAMESPACE_BLK);
|
|
|
|
module_init(nd_blk_init);
|
|
|
|
module_exit(nd_blk_exit);
|