diff options
Diffstat (limited to 'drivers/nvdimm/blk.c')
| -rw-r--r-- | drivers/nvdimm/blk.c | 333 |
1 files changed, 0 insertions, 333 deletions
diff --git a/drivers/nvdimm/blk.c b/drivers/nvdimm/blk.c deleted file mode 100644 index 0a3873833594..000000000000 --- a/drivers/nvdimm/blk.c +++ /dev/null @@ -1,333 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-only -/* - * NVDIMM Block Window Driver - * Copyright (c) 2014, Intel Corporation. - */ - -#include <linux/blkdev.h> -#include <linux/fs.h> -#include <linux/module.h> -#include <linux/moduleparam.h> -#include <linux/nd.h> -#include <linux/sizes.h> -#include "nd.h" - -static u32 nsblk_meta_size(struct nd_namespace_blk *nsblk) -{ - return nsblk->lbasize - ((nsblk->lbasize >= 4096) ? 4096 : 512); -} - -static u32 nsblk_internal_lbasize(struct nd_namespace_blk *nsblk) -{ - return roundup(nsblk->lbasize, INT_LBASIZE_ALIGNMENT); -} - -static u32 nsblk_sector_size(struct nd_namespace_blk *nsblk) -{ - return nsblk->lbasize - nsblk_meta_size(nsblk); -} - -static resource_size_t to_dev_offset(struct nd_namespace_blk *nsblk, - resource_size_t ns_offset, unsigned int len) -{ - int i; - - for (i = 0; i < nsblk->num_resources; i++) { - if (ns_offset < resource_size(nsblk->res[i])) { - if (ns_offset + len > resource_size(nsblk->res[i])) { - dev_WARN_ONCE(&nsblk->common.dev, 1, - "illegal request\n"); - return SIZE_MAX; - } - return nsblk->res[i]->start + ns_offset; - } - ns_offset -= resource_size(nsblk->res[i]); - } - - dev_WARN_ONCE(&nsblk->common.dev, 1, "request out of range\n"); - return SIZE_MAX; -} - -static struct nd_blk_region *to_ndbr(struct nd_namespace_blk *nsblk) -{ - struct nd_region *nd_region; - struct device *parent; - - parent = nsblk->common.dev.parent; - nd_region = container_of(parent, struct nd_region, dev); - return container_of(nd_region, struct nd_blk_region, nd_region); -} - -#ifdef CONFIG_BLK_DEV_INTEGRITY -static int nd_blk_rw_integrity(struct nd_namespace_blk *nsblk, - struct bio_integrity_payload *bip, u64 lba, int rw) -{ - struct nd_blk_region *ndbr = to_ndbr(nsblk); - unsigned int len = nsblk_meta_size(nsblk); - resource_size_t dev_offset, ns_offset; - u32 internal_lbasize, sector_size; - int err = 0; - - internal_lbasize = nsblk_internal_lbasize(nsblk); - sector_size = nsblk_sector_size(nsblk); - ns_offset = lba * internal_lbasize + sector_size; - dev_offset = to_dev_offset(nsblk, ns_offset, len); - if (dev_offset == SIZE_MAX) - return -EIO; - - while (len) { - unsigned int cur_len; - struct bio_vec bv; - void *iobuf; - - bv = bvec_iter_bvec(bip->bip_vec, bip->bip_iter); - /* - * The 'bv' obtained from bvec_iter_bvec has its .bv_len and - * .bv_offset already adjusted for iter->bi_bvec_done, and we - * can use those directly - */ - - cur_len = min(len, bv.bv_len); - iobuf = bvec_kmap_local(&bv); - err = ndbr->do_io(ndbr, dev_offset, iobuf, cur_len, rw); - kunmap_local(iobuf); - if (err) - return err; - - len -= cur_len; - dev_offset += cur_len; - if (!bvec_iter_advance(bip->bip_vec, &bip->bip_iter, cur_len)) - return -EIO; - } - - return err; -} - -#else /* CONFIG_BLK_DEV_INTEGRITY */ -static int nd_blk_rw_integrity(struct nd_namespace_blk *nsblk, - struct bio_integrity_payload *bip, u64 lba, int rw) -{ - return 0; -} -#endif - -static int nsblk_do_bvec(struct nd_namespace_blk *nsblk, - struct bio_integrity_payload *bip, struct page *page, - unsigned int len, unsigned int off, int rw, sector_t sector) -{ - struct nd_blk_region *ndbr = to_ndbr(nsblk); - resource_size_t dev_offset, ns_offset; - u32 internal_lbasize, sector_size; - int err = 0; - void *iobuf; - u64 lba; - - internal_lbasize = nsblk_internal_lbasize(nsblk); - sector_size = nsblk_sector_size(nsblk); - while (len) { - unsigned int cur_len; - - /* - * If we don't have an integrity payload, we don't have to - * split the bvec into sectors, as this would cause unnecessary - * Block Window setup/move steps. the do_io routine is capable - * of handling len <= PAGE_SIZE. - */ - cur_len = bip ? min(len, sector_size) : len; - - lba = div_u64(sector << SECTOR_SHIFT, sector_size); - ns_offset = lba * internal_lbasize; - dev_offset = to_dev_offset(nsblk, ns_offset, cur_len); - if (dev_offset == SIZE_MAX) - return -EIO; - - iobuf = kmap_atomic(page); - err = ndbr->do_io(ndbr, dev_offset, iobuf + off, cur_len, rw); - kunmap_atomic(iobuf); - if (err) - return err; - - if (bip) { - err = nd_blk_rw_integrity(nsblk, bip, lba, rw); - if (err) - return err; - } - len -= cur_len; - off += cur_len; - sector += sector_size >> SECTOR_SHIFT; - } - - return err; -} - -static void nd_blk_submit_bio(struct bio *bio) -{ - struct bio_integrity_payload *bip; - struct nd_namespace_blk *nsblk = bio->bi_bdev->bd_disk->private_data; - struct bvec_iter iter; - unsigned long start; - struct bio_vec bvec; - int err = 0, rw; - bool do_acct; - - if (!bio_integrity_prep(bio)) - return; - - bip = bio_integrity(bio); - rw = bio_data_dir(bio); - do_acct = blk_queue_io_stat(bio->bi_bdev->bd_disk->queue); - if (do_acct) - start = bio_start_io_acct(bio); - bio_for_each_segment(bvec, bio, iter) { - unsigned int len = bvec.bv_len; - - BUG_ON(len > PAGE_SIZE); - err = nsblk_do_bvec(nsblk, bip, bvec.bv_page, len, - bvec.bv_offset, rw, iter.bi_sector); - if (err) { - dev_dbg(&nsblk->common.dev, - "io error in %s sector %lld, len %d,\n", - (rw == READ) ? "READ" : "WRITE", - (unsigned long long) iter.bi_sector, len); - bio->bi_status = errno_to_blk_status(err); - break; - } - } - if (do_acct) - bio_end_io_acct(bio, start); - - bio_endio(bio); -} - -static int nsblk_rw_bytes(struct nd_namespace_common *ndns, - resource_size_t offset, void *iobuf, size_t n, int rw, - unsigned long flags) -{ - struct nd_namespace_blk *nsblk = to_nd_namespace_blk(&ndns->dev); - struct nd_blk_region *ndbr = to_ndbr(nsblk); - resource_size_t dev_offset; - - dev_offset = to_dev_offset(nsblk, offset, n); - - if (unlikely(offset + n > nsblk->size)) { - dev_WARN_ONCE(&ndns->dev, 1, "request out of range\n"); - return -EFAULT; - } - - if (dev_offset == SIZE_MAX) - return -EIO; - - return ndbr->do_io(ndbr, dev_offset, iobuf, n, rw); -} - -static const struct block_device_operations nd_blk_fops = { - .owner = THIS_MODULE, - .submit_bio = nd_blk_submit_bio, -}; - -static void nd_blk_release_disk(void *disk) -{ - del_gendisk(disk); - blk_cleanup_disk(disk); -} - -static int nsblk_attach_disk(struct nd_namespace_blk *nsblk) -{ - struct device *dev = &nsblk->common.dev; - resource_size_t available_disk_size; - struct gendisk *disk; - u64 internal_nlba; - int rc; - - internal_nlba = div_u64(nsblk->size, nsblk_internal_lbasize(nsblk)); - available_disk_size = internal_nlba * nsblk_sector_size(nsblk); - - disk = blk_alloc_disk(NUMA_NO_NODE); - if (!disk) - return -ENOMEM; - - disk->fops = &nd_blk_fops; - disk->private_data = nsblk; - nvdimm_namespace_disk_name(&nsblk->common, disk->disk_name); - - blk_queue_max_hw_sectors(disk->queue, UINT_MAX); - blk_queue_logical_block_size(disk->queue, nsblk_sector_size(nsblk)); - blk_queue_flag_set(QUEUE_FLAG_NONROT, disk->queue); - - if (nsblk_meta_size(nsblk)) { - rc = nd_integrity_init(disk, nsblk_meta_size(nsblk)); - - if (rc) - goto out_before_devm_err; - } - - set_capacity(disk, available_disk_size >> SECTOR_SHIFT); - rc = device_add_disk(dev, disk, NULL); - if (rc) - goto out_before_devm_err; - - /* nd_blk_release_disk() is called if this fails */ - if (devm_add_action_or_reset(dev, nd_blk_release_disk, disk)) - return -ENOMEM; - - nvdimm_check_and_set_ro(disk); - return 0; - -out_before_devm_err: - blk_cleanup_disk(disk); - return rc; -} - -static int nd_blk_probe(struct device *dev) -{ - struct nd_namespace_common *ndns; - struct nd_namespace_blk *nsblk; - - ndns = nvdimm_namespace_common_probe(dev); - if (IS_ERR(ndns)) - return PTR_ERR(ndns); - - nsblk = to_nd_namespace_blk(&ndns->dev); - nsblk->size = nvdimm_namespace_capacity(ndns); - dev_set_drvdata(dev, nsblk); - - ndns->rw_bytes = nsblk_rw_bytes; - if (is_nd_btt(dev)) - return nvdimm_namespace_attach_btt(ndns); - else if (nd_btt_probe(dev, ndns) == 0) { - /* we'll come back as btt-blk */ - return -ENXIO; - } else - return nsblk_attach_disk(nsblk); -} - -static void nd_blk_remove(struct device *dev) -{ - if (is_nd_btt(dev)) - nvdimm_namespace_detach_btt(to_nd_btt(dev)); -} - -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) -{ - return nd_driver_register(&nd_blk_driver); -} - -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); |