diff options
Diffstat (limited to 'drivers/nvme/target/io-cmd-bdev.c')
| -rw-r--r-- | drivers/nvme/target/io-cmd-bdev.c | 457 |
1 files changed, 457 insertions, 0 deletions
diff --git a/drivers/nvme/target/io-cmd-bdev.c b/drivers/nvme/target/io-cmd-bdev.c new file mode 100644 index 000000000..6a9626ff0 --- /dev/null +++ b/drivers/nvme/target/io-cmd-bdev.c @@ -0,0 +1,457 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * NVMe I/O command implementation. + * Copyright (c) 2015-2016 HGST, a Western Digital Company. + */ +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt +#include <linux/blkdev.h> +#include <linux/module.h> +#include "nvmet.h" + +void nvmet_bdev_set_limits(struct block_device *bdev, struct nvme_id_ns *id) +{ + const struct queue_limits *ql = &bdev_get_queue(bdev)->limits; + /* Number of logical blocks per physical block. */ + const u32 lpp = ql->physical_block_size / ql->logical_block_size; + /* Logical blocks per physical block, 0's based. */ + const __le16 lpp0b = to0based(lpp); + + /* + * For NVMe 1.2 and later, bit 1 indicates that the fields NAWUN, + * NAWUPF, and NACWU are defined for this namespace and should be + * used by the host for this namespace instead of the AWUN, AWUPF, + * and ACWU fields in the Identify Controller data structure. If + * any of these fields are zero that means that the corresponding + * field from the identify controller data structure should be used. + */ + id->nsfeat |= 1 << 1; + id->nawun = lpp0b; + id->nawupf = lpp0b; + id->nacwu = lpp0b; + + /* + * Bit 4 indicates that the fields NPWG, NPWA, NPDG, NPDA, and + * NOWS are defined for this namespace and should be used by + * the host for I/O optimization. + */ + id->nsfeat |= 1 << 4; + /* NPWG = Namespace Preferred Write Granularity. 0's based */ + id->npwg = lpp0b; + /* NPWA = Namespace Preferred Write Alignment. 0's based */ + id->npwa = id->npwg; + /* NPDG = Namespace Preferred Deallocate Granularity. 0's based */ + id->npdg = to0based(ql->discard_granularity / ql->logical_block_size); + /* NPDG = Namespace Preferred Deallocate Alignment */ + id->npda = id->npdg; + /* NOWS = Namespace Optimal Write Size */ + id->nows = to0based(ql->io_opt / ql->logical_block_size); +} + +static void nvmet_bdev_ns_enable_integrity(struct nvmet_ns *ns) +{ + struct blk_integrity *bi = bdev_get_integrity(ns->bdev); + + if (bi) { + ns->metadata_size = bi->tuple_size; + if (bi->profile == &t10_pi_type1_crc) + ns->pi_type = NVME_NS_DPS_PI_TYPE1; + else if (bi->profile == &t10_pi_type3_crc) + ns->pi_type = NVME_NS_DPS_PI_TYPE3; + else + /* Unsupported metadata type */ + ns->metadata_size = 0; + } +} + +int nvmet_bdev_ns_enable(struct nvmet_ns *ns) +{ + int ret; + + ns->bdev = blkdev_get_by_path(ns->device_path, + FMODE_READ | FMODE_WRITE, NULL); + if (IS_ERR(ns->bdev)) { + ret = PTR_ERR(ns->bdev); + if (ret != -ENOTBLK) { + pr_err("failed to open block device %s: (%ld)\n", + ns->device_path, PTR_ERR(ns->bdev)); + } + ns->bdev = NULL; + return ret; + } + ns->size = i_size_read(ns->bdev->bd_inode); + ns->blksize_shift = blksize_bits(bdev_logical_block_size(ns->bdev)); + + ns->pi_type = 0; + ns->metadata_size = 0; + if (IS_ENABLED(CONFIG_BLK_DEV_INTEGRITY_T10)) + nvmet_bdev_ns_enable_integrity(ns); + + return 0; +} + +void nvmet_bdev_ns_disable(struct nvmet_ns *ns) +{ + if (ns->bdev) { + blkdev_put(ns->bdev, FMODE_WRITE | FMODE_READ); + ns->bdev = NULL; + } +} + +void nvmet_bdev_ns_revalidate(struct nvmet_ns *ns) +{ + ns->size = i_size_read(ns->bdev->bd_inode); +} + +static u16 blk_to_nvme_status(struct nvmet_req *req, blk_status_t blk_sts) +{ + u16 status = NVME_SC_SUCCESS; + + if (likely(blk_sts == BLK_STS_OK)) + return status; + /* + * Right now there exists M : 1 mapping between block layer error + * to the NVMe status code (see nvme_error_status()). For consistency, + * when we reverse map we use most appropriate NVMe Status code from + * the group of the NVMe staus codes used in the nvme_error_status(). + */ + switch (blk_sts) { + case BLK_STS_NOSPC: + status = NVME_SC_CAP_EXCEEDED | NVME_SC_DNR; + req->error_loc = offsetof(struct nvme_rw_command, length); + break; + case BLK_STS_TARGET: + status = NVME_SC_LBA_RANGE | NVME_SC_DNR; + req->error_loc = offsetof(struct nvme_rw_command, slba); + break; + case BLK_STS_NOTSUPP: + req->error_loc = offsetof(struct nvme_common_command, opcode); + switch (req->cmd->common.opcode) { + case nvme_cmd_dsm: + case nvme_cmd_write_zeroes: + status = NVME_SC_ONCS_NOT_SUPPORTED | NVME_SC_DNR; + break; + default: + status = NVME_SC_INVALID_OPCODE | NVME_SC_DNR; + } + break; + case BLK_STS_MEDIUM: + status = NVME_SC_ACCESS_DENIED; + req->error_loc = offsetof(struct nvme_rw_command, nsid); + break; + case BLK_STS_IOERR: + default: + status = NVME_SC_INTERNAL | NVME_SC_DNR; + req->error_loc = offsetof(struct nvme_common_command, opcode); + } + + switch (req->cmd->common.opcode) { + case nvme_cmd_read: + case nvme_cmd_write: + req->error_slba = le64_to_cpu(req->cmd->rw.slba); + break; + case nvme_cmd_write_zeroes: + req->error_slba = + le64_to_cpu(req->cmd->write_zeroes.slba); + break; + default: + req->error_slba = 0; + } + return status; +} + +static void nvmet_bio_done(struct bio *bio) +{ + struct nvmet_req *req = bio->bi_private; + + nvmet_req_complete(req, blk_to_nvme_status(req, bio->bi_status)); + if (bio != &req->b.inline_bio) + bio_put(bio); +} + +#ifdef CONFIG_BLK_DEV_INTEGRITY +static int nvmet_bdev_alloc_bip(struct nvmet_req *req, struct bio *bio, + struct sg_mapping_iter *miter) +{ + struct blk_integrity *bi; + struct bio_integrity_payload *bip; + struct block_device *bdev = req->ns->bdev; + int rc; + size_t resid, len; + + bi = bdev_get_integrity(bdev); + if (unlikely(!bi)) { + pr_err("Unable to locate bio_integrity\n"); + return -ENODEV; + } + + bip = bio_integrity_alloc(bio, GFP_NOIO, + min_t(unsigned int, req->metadata_sg_cnt, BIO_MAX_PAGES)); + if (IS_ERR(bip)) { + pr_err("Unable to allocate bio_integrity_payload\n"); + return PTR_ERR(bip); + } + + bip->bip_iter.bi_size = bio_integrity_bytes(bi, bio_sectors(bio)); + /* virtual start sector must be in integrity interval units */ + bip_set_seed(bip, bio->bi_iter.bi_sector >> + (bi->interval_exp - SECTOR_SHIFT)); + + resid = bip->bip_iter.bi_size; + while (resid > 0 && sg_miter_next(miter)) { + len = min_t(size_t, miter->length, resid); + rc = bio_integrity_add_page(bio, miter->page, len, + offset_in_page(miter->addr)); + if (unlikely(rc != len)) { + pr_err("bio_integrity_add_page() failed; %d\n", rc); + sg_miter_stop(miter); + return -ENOMEM; + } + + resid -= len; + if (len < miter->length) + miter->consumed -= miter->length - len; + } + sg_miter_stop(miter); + + return 0; +} +#else +static int nvmet_bdev_alloc_bip(struct nvmet_req *req, struct bio *bio, + struct sg_mapping_iter *miter) +{ + return -EINVAL; +} +#endif /* CONFIG_BLK_DEV_INTEGRITY */ + +static void nvmet_bdev_execute_rw(struct nvmet_req *req) +{ + int sg_cnt = req->sg_cnt; + struct bio *bio; + struct scatterlist *sg; + struct blk_plug plug; + sector_t sector; + int op, i, rc; + struct sg_mapping_iter prot_miter; + unsigned int iter_flags; + unsigned int total_len = nvmet_rw_data_len(req) + req->metadata_len; + + if (!nvmet_check_transfer_len(req, total_len)) + return; + + if (!req->sg_cnt) { + nvmet_req_complete(req, 0); + return; + } + + if (req->cmd->rw.opcode == nvme_cmd_write) { + op = REQ_OP_WRITE | REQ_SYNC | REQ_IDLE; + if (req->cmd->rw.control & cpu_to_le16(NVME_RW_FUA)) + op |= REQ_FUA; + iter_flags = SG_MITER_TO_SG; + } else { + op = REQ_OP_READ; + iter_flags = SG_MITER_FROM_SG; + } + + if (is_pci_p2pdma_page(sg_page(req->sg))) + op |= REQ_NOMERGE; + + sector = nvmet_lba_to_sect(req->ns, req->cmd->rw.slba); + + if (nvmet_use_inline_bvec(req)) { + bio = &req->b.inline_bio; + bio_init(bio, req->inline_bvec, ARRAY_SIZE(req->inline_bvec)); + } else { + bio = bio_alloc(GFP_KERNEL, min(sg_cnt, BIO_MAX_PAGES)); + } + bio_set_dev(bio, req->ns->bdev); + bio->bi_iter.bi_sector = sector; + bio->bi_private = req; + bio->bi_end_io = nvmet_bio_done; + bio->bi_opf = op; + + blk_start_plug(&plug); + if (req->metadata_len) + sg_miter_start(&prot_miter, req->metadata_sg, + req->metadata_sg_cnt, iter_flags); + + for_each_sg(req->sg, sg, req->sg_cnt, i) { + while (bio_add_page(bio, sg_page(sg), sg->length, sg->offset) + != sg->length) { + struct bio *prev = bio; + + if (req->metadata_len) { + rc = nvmet_bdev_alloc_bip(req, bio, + &prot_miter); + if (unlikely(rc)) { + bio_io_error(bio); + return; + } + } + + bio = bio_alloc(GFP_KERNEL, min(sg_cnt, BIO_MAX_PAGES)); + bio_set_dev(bio, req->ns->bdev); + bio->bi_iter.bi_sector = sector; + bio->bi_opf = op; + + bio_chain(bio, prev); + submit_bio(prev); + } + + sector += sg->length >> 9; + sg_cnt--; + } + + if (req->metadata_len) { + rc = nvmet_bdev_alloc_bip(req, bio, &prot_miter); + if (unlikely(rc)) { + bio_io_error(bio); + return; + } + } + + submit_bio(bio); + blk_finish_plug(&plug); +} + +static void nvmet_bdev_execute_flush(struct nvmet_req *req) +{ + struct bio *bio = &req->b.inline_bio; + + if (!nvmet_check_transfer_len(req, 0)) + return; + + bio_init(bio, req->inline_bvec, ARRAY_SIZE(req->inline_bvec)); + bio_set_dev(bio, req->ns->bdev); + bio->bi_private = req; + bio->bi_end_io = nvmet_bio_done; + bio->bi_opf = REQ_OP_WRITE | REQ_PREFLUSH; + + submit_bio(bio); +} + +u16 nvmet_bdev_flush(struct nvmet_req *req) +{ + if (blkdev_issue_flush(req->ns->bdev, GFP_KERNEL)) + return NVME_SC_INTERNAL | NVME_SC_DNR; + return 0; +} + +static u16 nvmet_bdev_discard_range(struct nvmet_req *req, + struct nvme_dsm_range *range, struct bio **bio) +{ + struct nvmet_ns *ns = req->ns; + int ret; + + ret = __blkdev_issue_discard(ns->bdev, + nvmet_lba_to_sect(ns, range->slba), + le32_to_cpu(range->nlb) << (ns->blksize_shift - 9), + GFP_KERNEL, 0, bio); + if (ret && ret != -EOPNOTSUPP) { + req->error_slba = le64_to_cpu(range->slba); + return errno_to_nvme_status(req, ret); + } + return NVME_SC_SUCCESS; +} + +static void nvmet_bdev_execute_discard(struct nvmet_req *req) +{ + struct nvme_dsm_range range; + struct bio *bio = NULL; + int i; + u16 status; + + for (i = 0; i <= le32_to_cpu(req->cmd->dsm.nr); i++) { + status = nvmet_copy_from_sgl(req, i * sizeof(range), &range, + sizeof(range)); + if (status) + break; + + status = nvmet_bdev_discard_range(req, &range, &bio); + if (status) + break; + } + + if (bio) { + bio->bi_private = req; + bio->bi_end_io = nvmet_bio_done; + if (status) + bio_io_error(bio); + else + submit_bio(bio); + } else { + nvmet_req_complete(req, status); + } +} + +static void nvmet_bdev_execute_dsm(struct nvmet_req *req) +{ + if (!nvmet_check_data_len_lte(req, nvmet_dsm_len(req))) + return; + + switch (le32_to_cpu(req->cmd->dsm.attributes)) { + case NVME_DSMGMT_AD: + nvmet_bdev_execute_discard(req); + return; + case NVME_DSMGMT_IDR: + case NVME_DSMGMT_IDW: + default: + /* Not supported yet */ + nvmet_req_complete(req, 0); + return; + } +} + +static void nvmet_bdev_execute_write_zeroes(struct nvmet_req *req) +{ + struct nvme_write_zeroes_cmd *write_zeroes = &req->cmd->write_zeroes; + struct bio *bio = NULL; + sector_t sector; + sector_t nr_sector; + int ret; + + if (!nvmet_check_transfer_len(req, 0)) + return; + + sector = nvmet_lba_to_sect(req->ns, write_zeroes->slba); + nr_sector = (((sector_t)le16_to_cpu(write_zeroes->length) + 1) << + (req->ns->blksize_shift - 9)); + + ret = __blkdev_issue_zeroout(req->ns->bdev, sector, nr_sector, + GFP_KERNEL, &bio, 0); + if (bio) { + bio->bi_private = req; + bio->bi_end_io = nvmet_bio_done; + submit_bio(bio); + } else { + nvmet_req_complete(req, errno_to_nvme_status(req, ret)); + } +} + +u16 nvmet_bdev_parse_io_cmd(struct nvmet_req *req) +{ + struct nvme_command *cmd = req->cmd; + + switch (cmd->common.opcode) { + case nvme_cmd_read: + case nvme_cmd_write: + req->execute = nvmet_bdev_execute_rw; + if (req->sq->ctrl->pi_support && nvmet_ns_has_pi(req->ns)) + req->metadata_len = nvmet_rw_metadata_len(req); + return 0; + case nvme_cmd_flush: + req->execute = nvmet_bdev_execute_flush; + return 0; + case nvme_cmd_dsm: + req->execute = nvmet_bdev_execute_dsm; + return 0; + case nvme_cmd_write_zeroes: + req->execute = nvmet_bdev_execute_write_zeroes; + return 0; + default: + pr_err("unhandled cmd %d on qid %d\n", cmd->common.opcode, + req->sq->qid); + req->error_loc = offsetof(struct nvme_common_command, opcode); + return NVME_SC_INVALID_OPCODE | NVME_SC_DNR; + } +} |