diff options
author | Vishal Verma <vishal.l.verma@intel.com> | 2015-06-25 04:22:39 -0400 |
---|---|---|
committer | Dan Williams <dan.j.williams@intel.com> | 2015-06-26 11:23:38 -0400 |
commit | fcae695737fca0849c18db814d9d8de05c0fd2a2 (patch) | |
tree | d88f8a5edf637cf1013c764e14df8c97b4b77539 /drivers/nvdimm | |
parent | 41cd8b70c37ace40077c8d6ec0b74b983178c192 (diff) | |
download | blackbird-obmc-linux-fcae695737fca0849c18db814d9d8de05c0fd2a2.tar.gz blackbird-obmc-linux-fcae695737fca0849c18db814d9d8de05c0fd2a2.zip |
libnvdimm, blk: add support for blk integrity
Support multiple block sizes (sector + metadata) for nd_blk in the
same way as done for the BTT. Add the idea of an 'internal' lbasize,
which is properly aligned and padded, and store metadata in this space.
Signed-off-by: Vishal Verma <vishal.l.verma@linux.intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/nvdimm')
-rw-r--r-- | drivers/nvdimm/blk.c | 174 | ||||
-rw-r--r-- | drivers/nvdimm/btt.h | 1 | ||||
-rw-r--r-- | drivers/nvdimm/core.c | 3 | ||||
-rw-r--r-- | drivers/nvdimm/namespace_devs.c | 3 | ||||
-rw-r--r-- | drivers/nvdimm/nd.h | 1 |
5 files changed, 159 insertions, 23 deletions
diff --git a/drivers/nvdimm/blk.c b/drivers/nvdimm/blk.c index 9ac0c266c15c..5c44e067652f 100644 --- a/drivers/nvdimm/blk.c +++ b/drivers/nvdimm/blk.c @@ -27,10 +27,17 @@ struct nd_blk_device { struct nd_namespace_blk *nsblk; struct nd_blk_region *ndbr; size_t disk_size; + u32 sector_size; + u32 internal_lbasize; }; static int nd_blk_major; +static u32 nd_blk_meta_size(struct nd_blk_device *blk_dev) +{ + return blk_dev->nsblk->lbasize - blk_dev->sector_size; +} + static resource_size_t to_dev_offset(struct nd_namespace_blk *nsblk, resource_size_t ns_offset, unsigned int len) { @@ -52,41 +59,145 @@ static resource_size_t to_dev_offset(struct nd_namespace_blk *nsblk, return SIZE_MAX; } +#ifdef CONFIG_BLK_DEV_INTEGRITY +static int nd_blk_rw_integrity(struct nd_blk_device *blk_dev, + struct bio_integrity_payload *bip, u64 lba, + int rw) +{ + unsigned int len = nd_blk_meta_size(blk_dev); + resource_size_t dev_offset, ns_offset; + struct nd_namespace_blk *nsblk; + struct nd_blk_region *ndbr; + int err = 0; + + nsblk = blk_dev->nsblk; + ndbr = blk_dev->ndbr; + ns_offset = lba * blk_dev->internal_lbasize + blk_dev->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 = kmap_atomic(bv.bv_page); + err = ndbr->do_io(ndbr, dev_offset, iobuf + bv.bv_offset, + cur_len, rw); + kunmap_atomic(iobuf); + if (err) + return err; + + len -= cur_len; + dev_offset += cur_len; + bvec_iter_advance(bip->bip_vec, &bip->bip_iter, cur_len); + } + + return err; +} + +#else /* CONFIG_BLK_DEV_INTEGRITY */ +static int nd_blk_rw_integrity(struct nd_blk_device *blk_dev, + struct bio_integrity_payload *bip, u64 lba, + int rw) +{ + return 0; +} +#endif + +static int nd_blk_do_bvec(struct nd_blk_device *blk_dev, + struct bio_integrity_payload *bip, struct page *page, + unsigned int len, unsigned int off, int rw, + sector_t sector) +{ + struct nd_blk_region *ndbr = blk_dev->ndbr; + resource_size_t dev_offset, ns_offset; + int err = 0; + void *iobuf; + u64 lba; + + 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, blk_dev->sector_size) : len; + + lba = div_u64(sector << SECTOR_SHIFT, blk_dev->sector_size); + ns_offset = lba * blk_dev->internal_lbasize; + dev_offset = to_dev_offset(blk_dev->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(blk_dev, bip, lba, rw); + if (err) + return err; + } + len -= cur_len; + off += cur_len; + sector += blk_dev->sector_size >> SECTOR_SHIFT; + } + + return err; +} + static void nd_blk_make_request(struct request_queue *q, struct bio *bio) { struct block_device *bdev = bio->bi_bdev; struct gendisk *disk = bdev->bd_disk; - struct nd_namespace_blk *nsblk; + struct bio_integrity_payload *bip; struct nd_blk_device *blk_dev; - struct nd_blk_region *ndbr; struct bvec_iter iter; struct bio_vec bvec; int err = 0, rw; + /* + * bio_integrity_enabled also checks if the bio already has an + * integrity payload attached. If it does, we *don't* do a + * bio_integrity_prep here - the payload has been generated by + * another kernel subsystem, and we just pass it through. + */ + if (bio_integrity_enabled(bio) && bio_integrity_prep(bio)) { + err = -EIO; + goto out; + } + + bip = bio_integrity(bio); blk_dev = disk->private_data; - nsblk = blk_dev->nsblk; - ndbr = blk_dev->ndbr; rw = bio_data_dir(bio); bio_for_each_segment(bvec, bio, iter) { unsigned int len = bvec.bv_len; - resource_size_t dev_offset; - void *iobuf; BUG_ON(len > PAGE_SIZE); - - dev_offset = to_dev_offset(nsblk, - iter.bi_sector << SECTOR_SHIFT, len); - if (dev_offset == SIZE_MAX) { - err = -EIO; + err = nd_blk_do_bvec(blk_dev, bip, bvec.bv_page, len, + bvec.bv_offset, rw, iter.bi_sector); + if (err) { + dev_info(&blk_dev->nsblk->common.dev, + "io error in %s sector %lld, len %d,\n", + (rw == READ) ? "READ" : "WRITE", + (unsigned long long) iter.bi_sector, len); goto out; } - - iobuf = kmap_atomic(bvec.bv_page); - err = ndbr->do_io(ndbr, dev_offset, iobuf + bvec.bv_offset, - len, rw); - kunmap_atomic(iobuf); - if (err) - goto out; } out: @@ -121,8 +232,12 @@ static const struct block_device_operations nd_blk_fops = { static int nd_blk_attach_disk(struct nd_namespace_common *ndns, struct nd_blk_device *blk_dev) { - struct nd_namespace_blk *nsblk = to_nd_namespace_blk(&ndns->dev); + resource_size_t available_disk_size; struct gendisk *disk; + u64 internal_nlba; + + internal_nlba = div_u64(blk_dev->disk_size, blk_dev->internal_lbasize); + available_disk_size = internal_nlba * blk_dev->sector_size; blk_dev->queue = blk_alloc_queue(GFP_KERNEL); if (!blk_dev->queue) @@ -131,7 +246,7 @@ static int nd_blk_attach_disk(struct nd_namespace_common *ndns, blk_queue_make_request(blk_dev->queue, nd_blk_make_request); blk_queue_max_hw_sectors(blk_dev->queue, UINT_MAX); blk_queue_bounce_limit(blk_dev->queue, BLK_BOUNCE_ANY); - blk_queue_logical_block_size(blk_dev->queue, nsblk->lbasize); + blk_queue_logical_block_size(blk_dev->queue, blk_dev->sector_size); queue_flag_set_unlocked(QUEUE_FLAG_NONROT, blk_dev->queue); disk = blk_dev->disk = alloc_disk(0); @@ -148,15 +263,28 @@ static int nd_blk_attach_disk(struct nd_namespace_common *ndns, disk->queue = blk_dev->queue; disk->flags = GENHD_FL_EXT_DEVT; nvdimm_namespace_disk_name(ndns, disk->disk_name); - set_capacity(disk, blk_dev->disk_size >> SECTOR_SHIFT); + set_capacity(disk, 0); add_disk(disk); + if (nd_blk_meta_size(blk_dev)) { + int rc = nd_integrity_init(disk, nd_blk_meta_size(blk_dev)); + + if (rc) { + del_gendisk(disk); + put_disk(disk); + blk_cleanup_queue(blk_dev->queue); + return rc; + } + } + + set_capacity(disk, available_disk_size >> SECTOR_SHIFT); return 0; } static int nd_blk_probe(struct device *dev) { struct nd_namespace_common *ndns; + struct nd_namespace_blk *nsblk; struct nd_blk_device *blk_dev; int rc; @@ -168,9 +296,13 @@ static int nd_blk_probe(struct device *dev) if (!blk_dev) return -ENOMEM; + nsblk = to_nd_namespace_blk(&ndns->dev); blk_dev->disk_size = nvdimm_namespace_capacity(ndns); blk_dev->ndbr = to_nd_blk_region(dev->parent); blk_dev->nsblk = to_nd_namespace_blk(&ndns->dev); + blk_dev->internal_lbasize = roundup(nsblk->lbasize, + INT_LBASIZE_ALIGNMENT); + blk_dev->sector_size = ((nsblk->lbasize >= 4096) ? 4096 : 512); dev_set_drvdata(dev, blk_dev); ndns->rw_bytes = nd_blk_rw_bytes; diff --git a/drivers/nvdimm/btt.h b/drivers/nvdimm/btt.h index 2caa0ef7e67a..75b0d80a6bd9 100644 --- a/drivers/nvdimm/btt.h +++ b/drivers/nvdimm/btt.h @@ -31,7 +31,6 @@ #define ARENA_MAX_SIZE (1ULL << 39) /* 512 GB */ #define RTT_VALID (1UL << 31) #define RTT_INVALID 0 -#define INT_LBASIZE_ALIGNMENT 64 #define BTT_PG_SIZE 4096 #define BTT_DEFAULT_NFREE ND_MAX_LANES #define LOG_SEQ_INIT 1 diff --git a/drivers/nvdimm/core.c b/drivers/nvdimm/core.c index 1d96b9a6e4cc..4288169432de 100644 --- a/drivers/nvdimm/core.c +++ b/drivers/nvdimm/core.c @@ -379,6 +379,9 @@ int nd_integrity_init(struct gendisk *disk, unsigned long meta_size) }; int ret; + if (meta_size == 0) + return 0; + ret = blk_integrity_register(disk, &integrity); if (ret) return ret; diff --git a/drivers/nvdimm/namespace_devs.c b/drivers/nvdimm/namespace_devs.c index 1ce1e70de44a..27d69bd3b4d6 100644 --- a/drivers/nvdimm/namespace_devs.c +++ b/drivers/nvdimm/namespace_devs.c @@ -1059,7 +1059,8 @@ static ssize_t resource_show(struct device *dev, } static DEVICE_ATTR_RO(resource); -static const unsigned long ns_lbasize_supported[] = { 512, 0 }; +static const unsigned long ns_lbasize_supported[] = { 512, 520, 528, + 4096, 4104, 4160, 4224, 0 }; static ssize_t sector_size_show(struct device *dev, struct device_attribute *attr, char *buf) diff --git a/drivers/nvdimm/nd.h b/drivers/nvdimm/nd.h index f4459faa456c..6f916b65b7d6 100644 --- a/drivers/nvdimm/nd.h +++ b/drivers/nvdimm/nd.h @@ -27,6 +27,7 @@ enum { */ ND_MAX_LANES = 256, SECTOR_SHIFT = 9, + INT_LBASIZE_ALIGNMENT = 64, }; struct nvdimm_drvdata { |