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-rw-r--r--drivers/nvme/target/io-cmd-bdev.c474
1 files changed, 474 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..c2d6cea02
--- /dev/null
+++ b/drivers/nvme/target/io-cmd-bdev.c
@@ -0,0 +1,474 @@
+// 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/blk-integrity.h>
+#include <linux/memremap.h>
+#include <linux/module.h>
+#include "nvmet.h"
+
+void nvmet_bdev_set_limits(struct block_device *bdev, struct nvme_id_ns *id)
+{
+ /* Logical blocks per physical block, 0's based. */
+ const __le16 lpp0b = to0based(bdev_physical_block_size(bdev) /
+ bdev_logical_block_size(bdev));
+
+ /*
+ * 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(bdev_discard_granularity(bdev) /
+ bdev_logical_block_size(bdev));
+ /* NPDG = Namespace Preferred Deallocate Alignment */
+ id->npda = id->npdg;
+ /* NOWS = Namespace Optimal Write Size */
+ id->nows = to0based(bdev_io_opt(bdev) / bdev_logical_block_size(bdev));
+}
+
+void nvmet_bdev_ns_disable(struct nvmet_ns *ns)
+{
+ if (ns->bdev) {
+ blkdev_put(ns->bdev, FMODE_WRITE | FMODE_READ);
+ ns->bdev = NULL;
+ }
+}
+
+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;
+
+ /*
+ * When buffered_io namespace attribute is enabled that means user want
+ * this block device to be used as a file, so block device can take
+ * an advantage of cache.
+ */
+ if (ns->buffered_io)
+ return -ENOTBLK;
+
+ 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 = bdev_nr_bytes(ns->bdev);
+ 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);
+
+ if (bdev_is_zoned(ns->bdev)) {
+ if (!nvmet_bdev_zns_enable(ns)) {
+ nvmet_bdev_ns_disable(ns);
+ return -EINVAL;
+ }
+ ns->csi = NVME_CSI_ZNS;
+ }
+
+ return 0;
+}
+
+void nvmet_bdev_ns_revalidate(struct nvmet_ns *ns)
+{
+ ns->size = bdev_nr_bytes(ns->bdev);
+}
+
+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));
+ nvmet_req_bio_put(req, 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;
+ int rc;
+ size_t resid, len;
+
+ bi = bdev_get_integrity(req->ns->bdev);
+ if (unlikely(!bi)) {
+ pr_err("Unable to locate bio_integrity\n");
+ return -ENODEV;
+ }
+
+ bip = bio_integrity_alloc(bio, GFP_NOIO,
+ bio_max_segs(req->metadata_sg_cnt));
+ 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)
+{
+ unsigned int sg_cnt = req->sg_cnt;
+ struct bio *bio;
+ struct scatterlist *sg;
+ struct blk_plug plug;
+ sector_t sector;
+ blk_opf_t opf;
+ int 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) {
+ opf = REQ_OP_WRITE | REQ_SYNC | REQ_IDLE;
+ if (req->cmd->rw.control & cpu_to_le16(NVME_RW_FUA))
+ opf |= REQ_FUA;
+ iter_flags = SG_MITER_TO_SG;
+ } else {
+ opf = REQ_OP_READ;
+ iter_flags = SG_MITER_FROM_SG;
+ }
+
+ if (is_pci_p2pdma_page(sg_page(req->sg)))
+ opf |= 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->ns->bdev, req->inline_bvec,
+ ARRAY_SIZE(req->inline_bvec), opf);
+ } else {
+ bio = bio_alloc(req->ns->bdev, bio_max_segs(sg_cnt), opf,
+ GFP_KERNEL);
+ }
+ bio->bi_iter.bi_sector = sector;
+ bio->bi_private = req;
+ bio->bi_end_io = nvmet_bio_done;
+
+ 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(req->ns->bdev, bio_max_segs(sg_cnt),
+ opf, GFP_KERNEL);
+ bio->bi_iter.bi_sector = sector;
+
+ 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 (!bdev_write_cache(req->ns->bdev)) {
+ nvmet_req_complete(req, NVME_SC_SUCCESS);
+ return;
+ }
+
+ if (!nvmet_check_transfer_len(req, 0))
+ return;
+
+ bio_init(bio, req->ns->bdev, req->inline_bvec,
+ ARRAY_SIZE(req->inline_bvec), REQ_OP_WRITE | REQ_PREFLUSH);
+ bio->bi_private = req;
+ bio->bi_end_io = nvmet_bio_done;
+
+ submit_bio(bio);
+}
+
+u16 nvmet_bdev_flush(struct nvmet_req *req)
+{
+ if (!bdev_write_cache(req->ns->bdev))
+ return 0;
+
+ if (blkdev_issue_flush(req->ns->bdev))
+ 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, 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)
+{
+ switch (req->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:
+ return nvmet_report_invalid_opcode(req);
+ }
+}