From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 20:49:45 +0200 Subject: Adding upstream version 6.1.76. Signed-off-by: Daniel Baumann --- drivers/nvme/target/zns.c | 629 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 629 insertions(+) create mode 100644 drivers/nvme/target/zns.c (limited to 'drivers/nvme/target/zns.c') diff --git a/drivers/nvme/target/zns.c b/drivers/nvme/target/zns.c new file mode 100644 index 000000000..d93ee4ae1 --- /dev/null +++ b/drivers/nvme/target/zns.c @@ -0,0 +1,629 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * NVMe ZNS-ZBD command implementation. + * Copyright (C) 2021 Western Digital Corporation or its affiliates. + */ +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt +#include +#include +#include "nvmet.h" + +/* + * We set the Memory Page Size Minimum (MPSMIN) for target controller to 0 + * which gets added by 12 in the nvme_enable_ctrl() which results in 2^12 = 4k + * as page_shift value. When calculating the ZASL use shift by 12. + */ +#define NVMET_MPSMIN_SHIFT 12 + +static inline u8 nvmet_zasl(unsigned int zone_append_sects) +{ + /* + * Zone Append Size Limit (zasl) is expressed as a power of 2 value + * with the minimum memory page size (i.e. 12) as unit. + */ + return ilog2(zone_append_sects >> (NVMET_MPSMIN_SHIFT - 9)); +} + +static int validate_conv_zones_cb(struct blk_zone *z, + unsigned int i, void *data) +{ + if (z->type == BLK_ZONE_TYPE_CONVENTIONAL) + return -EOPNOTSUPP; + return 0; +} + +bool nvmet_bdev_zns_enable(struct nvmet_ns *ns) +{ + u8 zasl = nvmet_zasl(bdev_max_zone_append_sectors(ns->bdev)); + struct gendisk *bd_disk = ns->bdev->bd_disk; + int ret; + + if (ns->subsys->zasl) { + if (ns->subsys->zasl > zasl) + return false; + } + ns->subsys->zasl = zasl; + + /* + * Generic zoned block devices may have a smaller last zone which is + * not supported by ZNS. Exclude zoned drives that have such smaller + * last zone. + */ + if (get_capacity(bd_disk) & (bdev_zone_sectors(ns->bdev) - 1)) + return false; + /* + * ZNS does not define a conventional zone type. If the underlying + * device has a bitmap set indicating the existence of conventional + * zones, reject the device. Otherwise, use report zones to detect if + * the device has conventional zones. + */ + if (ns->bdev->bd_disk->conv_zones_bitmap) + return false; + + ret = blkdev_report_zones(ns->bdev, 0, bdev_nr_zones(ns->bdev), + validate_conv_zones_cb, NULL); + if (ret < 0) + return false; + + ns->blksize_shift = blksize_bits(bdev_logical_block_size(ns->bdev)); + + return true; +} + +void nvmet_execute_identify_ctrl_zns(struct nvmet_req *req) +{ + u8 zasl = req->sq->ctrl->subsys->zasl; + struct nvmet_ctrl *ctrl = req->sq->ctrl; + struct nvme_id_ctrl_zns *id; + u16 status; + + id = kzalloc(sizeof(*id), GFP_KERNEL); + if (!id) { + status = NVME_SC_INTERNAL; + goto out; + } + + if (ctrl->ops->get_mdts) + id->zasl = min_t(u8, ctrl->ops->get_mdts(ctrl), zasl); + else + id->zasl = zasl; + + status = nvmet_copy_to_sgl(req, 0, id, sizeof(*id)); + + kfree(id); +out: + nvmet_req_complete(req, status); +} + +void nvmet_execute_identify_cns_cs_ns(struct nvmet_req *req) +{ + struct nvme_id_ns_zns *id_zns = NULL; + u64 zsze; + u16 status; + u32 mar, mor; + + if (le32_to_cpu(req->cmd->identify.nsid) == NVME_NSID_ALL) { + req->error_loc = offsetof(struct nvme_identify, nsid); + status = NVME_SC_INVALID_NS | NVME_SC_DNR; + goto out; + } + + id_zns = kzalloc(sizeof(*id_zns), GFP_KERNEL); + if (!id_zns) { + status = NVME_SC_INTERNAL; + goto out; + } + + status = nvmet_req_find_ns(req); + if (status) + goto done; + + if (nvmet_ns_revalidate(req->ns)) { + mutex_lock(&req->ns->subsys->lock); + nvmet_ns_changed(req->ns->subsys, req->ns->nsid); + mutex_unlock(&req->ns->subsys->lock); + } + + if (!bdev_is_zoned(req->ns->bdev)) { + status = NVME_SC_INVALID_FIELD | NVME_SC_DNR; + req->error_loc = offsetof(struct nvme_identify, nsid); + goto out; + } + + zsze = (bdev_zone_sectors(req->ns->bdev) << 9) >> + req->ns->blksize_shift; + id_zns->lbafe[0].zsze = cpu_to_le64(zsze); + + mor = bdev_max_open_zones(req->ns->bdev); + if (!mor) + mor = U32_MAX; + else + mor--; + id_zns->mor = cpu_to_le32(mor); + + mar = bdev_max_active_zones(req->ns->bdev); + if (!mar) + mar = U32_MAX; + else + mar--; + id_zns->mar = cpu_to_le32(mar); + +done: + status = nvmet_copy_to_sgl(req, 0, id_zns, sizeof(*id_zns)); +out: + kfree(id_zns); + nvmet_req_complete(req, status); +} + +static u16 nvmet_bdev_validate_zone_mgmt_recv(struct nvmet_req *req) +{ + sector_t sect = nvmet_lba_to_sect(req->ns, req->cmd->zmr.slba); + u32 out_bufsize = (le32_to_cpu(req->cmd->zmr.numd) + 1) << 2; + + if (sect >= get_capacity(req->ns->bdev->bd_disk)) { + req->error_loc = offsetof(struct nvme_zone_mgmt_recv_cmd, slba); + return NVME_SC_LBA_RANGE | NVME_SC_DNR; + } + + if (out_bufsize < sizeof(struct nvme_zone_report)) { + req->error_loc = offsetof(struct nvme_zone_mgmt_recv_cmd, numd); + return NVME_SC_INVALID_FIELD | NVME_SC_DNR; + } + + if (req->cmd->zmr.zra != NVME_ZRA_ZONE_REPORT) { + req->error_loc = offsetof(struct nvme_zone_mgmt_recv_cmd, zra); + return NVME_SC_INVALID_FIELD | NVME_SC_DNR; + } + + switch (req->cmd->zmr.pr) { + case 0: + case 1: + break; + default: + req->error_loc = offsetof(struct nvme_zone_mgmt_recv_cmd, pr); + return NVME_SC_INVALID_FIELD | NVME_SC_DNR; + } + + switch (req->cmd->zmr.zrasf) { + case NVME_ZRASF_ZONE_REPORT_ALL: + case NVME_ZRASF_ZONE_STATE_EMPTY: + case NVME_ZRASF_ZONE_STATE_IMP_OPEN: + case NVME_ZRASF_ZONE_STATE_EXP_OPEN: + case NVME_ZRASF_ZONE_STATE_CLOSED: + case NVME_ZRASF_ZONE_STATE_FULL: + case NVME_ZRASF_ZONE_STATE_READONLY: + case NVME_ZRASF_ZONE_STATE_OFFLINE: + break; + default: + req->error_loc = + offsetof(struct nvme_zone_mgmt_recv_cmd, zrasf); + return NVME_SC_INVALID_FIELD | NVME_SC_DNR; + } + + return NVME_SC_SUCCESS; +} + +struct nvmet_report_zone_data { + struct nvmet_req *req; + u64 out_buf_offset; + u64 out_nr_zones; + u64 nr_zones; + u8 zrasf; +}; + +static int nvmet_bdev_report_zone_cb(struct blk_zone *z, unsigned i, void *d) +{ + static const unsigned int nvme_zrasf_to_blk_zcond[] = { + [NVME_ZRASF_ZONE_STATE_EMPTY] = BLK_ZONE_COND_EMPTY, + [NVME_ZRASF_ZONE_STATE_IMP_OPEN] = BLK_ZONE_COND_IMP_OPEN, + [NVME_ZRASF_ZONE_STATE_EXP_OPEN] = BLK_ZONE_COND_EXP_OPEN, + [NVME_ZRASF_ZONE_STATE_CLOSED] = BLK_ZONE_COND_CLOSED, + [NVME_ZRASF_ZONE_STATE_READONLY] = BLK_ZONE_COND_READONLY, + [NVME_ZRASF_ZONE_STATE_FULL] = BLK_ZONE_COND_FULL, + [NVME_ZRASF_ZONE_STATE_OFFLINE] = BLK_ZONE_COND_OFFLINE, + }; + struct nvmet_report_zone_data *rz = d; + + if (rz->zrasf != NVME_ZRASF_ZONE_REPORT_ALL && + z->cond != nvme_zrasf_to_blk_zcond[rz->zrasf]) + return 0; + + if (rz->nr_zones < rz->out_nr_zones) { + struct nvme_zone_descriptor zdesc = { }; + u16 status; + + zdesc.zcap = nvmet_sect_to_lba(rz->req->ns, z->capacity); + zdesc.zslba = nvmet_sect_to_lba(rz->req->ns, z->start); + zdesc.wp = nvmet_sect_to_lba(rz->req->ns, z->wp); + zdesc.za = z->reset ? 1 << 2 : 0; + zdesc.zs = z->cond << 4; + zdesc.zt = z->type; + + status = nvmet_copy_to_sgl(rz->req, rz->out_buf_offset, &zdesc, + sizeof(zdesc)); + if (status) + return -EINVAL; + + rz->out_buf_offset += sizeof(zdesc); + } + + rz->nr_zones++; + + return 0; +} + +static unsigned long nvmet_req_nr_zones_from_slba(struct nvmet_req *req) +{ + unsigned int sect = nvmet_lba_to_sect(req->ns, req->cmd->zmr.slba); + + return bdev_nr_zones(req->ns->bdev) - + (sect >> ilog2(bdev_zone_sectors(req->ns->bdev))); +} + +static unsigned long get_nr_zones_from_buf(struct nvmet_req *req, u32 bufsize) +{ + if (bufsize <= sizeof(struct nvme_zone_report)) + return 0; + + return (bufsize - sizeof(struct nvme_zone_report)) / + sizeof(struct nvme_zone_descriptor); +} + +static void nvmet_bdev_zone_zmgmt_recv_work(struct work_struct *w) +{ + struct nvmet_req *req = container_of(w, struct nvmet_req, z.zmgmt_work); + sector_t start_sect = nvmet_lba_to_sect(req->ns, req->cmd->zmr.slba); + unsigned long req_slba_nr_zones = nvmet_req_nr_zones_from_slba(req); + u32 out_bufsize = (le32_to_cpu(req->cmd->zmr.numd) + 1) << 2; + __le64 nr_zones; + u16 status; + int ret; + struct nvmet_report_zone_data rz_data = { + .out_nr_zones = get_nr_zones_from_buf(req, out_bufsize), + /* leave the place for report zone header */ + .out_buf_offset = sizeof(struct nvme_zone_report), + .zrasf = req->cmd->zmr.zrasf, + .nr_zones = 0, + .req = req, + }; + + status = nvmet_bdev_validate_zone_mgmt_recv(req); + if (status) + goto out; + + if (!req_slba_nr_zones) { + status = NVME_SC_SUCCESS; + goto out; + } + + ret = blkdev_report_zones(req->ns->bdev, start_sect, req_slba_nr_zones, + nvmet_bdev_report_zone_cb, &rz_data); + if (ret < 0) { + status = NVME_SC_INTERNAL; + goto out; + } + + /* + * When partial bit is set nr_zones must indicate the number of zone + * descriptors actually transferred. + */ + if (req->cmd->zmr.pr) + rz_data.nr_zones = min(rz_data.nr_zones, rz_data.out_nr_zones); + + nr_zones = cpu_to_le64(rz_data.nr_zones); + status = nvmet_copy_to_sgl(req, 0, &nr_zones, sizeof(nr_zones)); + +out: + nvmet_req_complete(req, status); +} + +void nvmet_bdev_execute_zone_mgmt_recv(struct nvmet_req *req) +{ + INIT_WORK(&req->z.zmgmt_work, nvmet_bdev_zone_zmgmt_recv_work); + queue_work(zbd_wq, &req->z.zmgmt_work); +} + +static inline enum req_op zsa_req_op(u8 zsa) +{ + switch (zsa) { + case NVME_ZONE_OPEN: + return REQ_OP_ZONE_OPEN; + case NVME_ZONE_CLOSE: + return REQ_OP_ZONE_CLOSE; + case NVME_ZONE_FINISH: + return REQ_OP_ZONE_FINISH; + case NVME_ZONE_RESET: + return REQ_OP_ZONE_RESET; + default: + return REQ_OP_LAST; + } +} + +static u16 blkdev_zone_mgmt_errno_to_nvme_status(int ret) +{ + switch (ret) { + case 0: + return NVME_SC_SUCCESS; + case -EINVAL: + case -EIO: + return NVME_SC_ZONE_INVALID_TRANSITION | NVME_SC_DNR; + default: + return NVME_SC_INTERNAL; + } +} + +struct nvmet_zone_mgmt_send_all_data { + unsigned long *zbitmap; + struct nvmet_req *req; +}; + +static int zmgmt_send_scan_cb(struct blk_zone *z, unsigned i, void *d) +{ + struct nvmet_zone_mgmt_send_all_data *data = d; + + switch (zsa_req_op(data->req->cmd->zms.zsa)) { + case REQ_OP_ZONE_OPEN: + switch (z->cond) { + case BLK_ZONE_COND_CLOSED: + break; + default: + return 0; + } + break; + case REQ_OP_ZONE_CLOSE: + switch (z->cond) { + case BLK_ZONE_COND_IMP_OPEN: + case BLK_ZONE_COND_EXP_OPEN: + break; + default: + return 0; + } + break; + case REQ_OP_ZONE_FINISH: + switch (z->cond) { + case BLK_ZONE_COND_IMP_OPEN: + case BLK_ZONE_COND_EXP_OPEN: + case BLK_ZONE_COND_CLOSED: + break; + default: + return 0; + } + break; + default: + return -EINVAL; + } + + set_bit(i, data->zbitmap); + + return 0; +} + +static u16 nvmet_bdev_zone_mgmt_emulate_all(struct nvmet_req *req) +{ + struct block_device *bdev = req->ns->bdev; + unsigned int nr_zones = bdev_nr_zones(bdev); + struct bio *bio = NULL; + sector_t sector = 0; + int ret; + struct nvmet_zone_mgmt_send_all_data d = { + .req = req, + }; + + d.zbitmap = kcalloc_node(BITS_TO_LONGS(nr_zones), sizeof(*(d.zbitmap)), + GFP_NOIO, bdev->bd_disk->node_id); + if (!d.zbitmap) { + ret = -ENOMEM; + goto out; + } + + /* Scan and build bitmap of the eligible zones */ + ret = blkdev_report_zones(bdev, 0, nr_zones, zmgmt_send_scan_cb, &d); + if (ret != nr_zones) { + if (ret > 0) + ret = -EIO; + goto out; + } else { + /* We scanned all the zones */ + ret = 0; + } + + while (sector < bdev_nr_sectors(bdev)) { + if (test_bit(disk_zone_no(bdev->bd_disk, sector), d.zbitmap)) { + bio = blk_next_bio(bio, bdev, 0, + zsa_req_op(req->cmd->zms.zsa) | REQ_SYNC, + GFP_KERNEL); + bio->bi_iter.bi_sector = sector; + /* This may take a while, so be nice to others */ + cond_resched(); + } + sector += bdev_zone_sectors(bdev); + } + + if (bio) { + ret = submit_bio_wait(bio); + bio_put(bio); + } + +out: + kfree(d.zbitmap); + + return blkdev_zone_mgmt_errno_to_nvme_status(ret); +} + +static u16 nvmet_bdev_execute_zmgmt_send_all(struct nvmet_req *req) +{ + int ret; + + switch (zsa_req_op(req->cmd->zms.zsa)) { + case REQ_OP_ZONE_RESET: + ret = blkdev_zone_mgmt(req->ns->bdev, REQ_OP_ZONE_RESET, 0, + get_capacity(req->ns->bdev->bd_disk), + GFP_KERNEL); + if (ret < 0) + return blkdev_zone_mgmt_errno_to_nvme_status(ret); + break; + case REQ_OP_ZONE_OPEN: + case REQ_OP_ZONE_CLOSE: + case REQ_OP_ZONE_FINISH: + return nvmet_bdev_zone_mgmt_emulate_all(req); + default: + /* this is needed to quiet compiler warning */ + req->error_loc = offsetof(struct nvme_zone_mgmt_send_cmd, zsa); + return NVME_SC_INVALID_FIELD | NVME_SC_DNR; + } + + return NVME_SC_SUCCESS; +} + +static void nvmet_bdev_zmgmt_send_work(struct work_struct *w) +{ + struct nvmet_req *req = container_of(w, struct nvmet_req, z.zmgmt_work); + sector_t sect = nvmet_lba_to_sect(req->ns, req->cmd->zms.slba); + enum req_op op = zsa_req_op(req->cmd->zms.zsa); + struct block_device *bdev = req->ns->bdev; + sector_t zone_sectors = bdev_zone_sectors(bdev); + u16 status = NVME_SC_SUCCESS; + int ret; + + if (op == REQ_OP_LAST) { + req->error_loc = offsetof(struct nvme_zone_mgmt_send_cmd, zsa); + status = NVME_SC_ZONE_INVALID_TRANSITION | NVME_SC_DNR; + goto out; + } + + /* when select all bit is set slba field is ignored */ + if (req->cmd->zms.select_all) { + status = nvmet_bdev_execute_zmgmt_send_all(req); + goto out; + } + + if (sect >= get_capacity(bdev->bd_disk)) { + req->error_loc = offsetof(struct nvme_zone_mgmt_send_cmd, slba); + status = NVME_SC_LBA_RANGE | NVME_SC_DNR; + goto out; + } + + if (sect & (zone_sectors - 1)) { + req->error_loc = offsetof(struct nvme_zone_mgmt_send_cmd, slba); + status = NVME_SC_INVALID_FIELD | NVME_SC_DNR; + goto out; + } + + ret = blkdev_zone_mgmt(bdev, op, sect, zone_sectors, GFP_KERNEL); + if (ret < 0) + status = blkdev_zone_mgmt_errno_to_nvme_status(ret); + +out: + nvmet_req_complete(req, status); +} + +void nvmet_bdev_execute_zone_mgmt_send(struct nvmet_req *req) +{ + INIT_WORK(&req->z.zmgmt_work, nvmet_bdev_zmgmt_send_work); + queue_work(zbd_wq, &req->z.zmgmt_work); +} + +static void nvmet_bdev_zone_append_bio_done(struct bio *bio) +{ + struct nvmet_req *req = bio->bi_private; + + if (bio->bi_status == BLK_STS_OK) { + req->cqe->result.u64 = + nvmet_sect_to_lba(req->ns, bio->bi_iter.bi_sector); + } + + nvmet_req_complete(req, blk_to_nvme_status(req, bio->bi_status)); + nvmet_req_bio_put(req, bio); +} + +void nvmet_bdev_execute_zone_append(struct nvmet_req *req) +{ + sector_t sect = nvmet_lba_to_sect(req->ns, req->cmd->rw.slba); + const blk_opf_t opf = REQ_OP_ZONE_APPEND | REQ_SYNC | REQ_IDLE; + u16 status = NVME_SC_SUCCESS; + unsigned int total_len = 0; + struct scatterlist *sg; + struct bio *bio; + int sg_cnt; + + /* Request is completed on len mismatch in nvmet_check_transter_len() */ + if (!nvmet_check_transfer_len(req, nvmet_rw_data_len(req))) + return; + + if (!req->sg_cnt) { + nvmet_req_complete(req, 0); + return; + } + + if (sect >= get_capacity(req->ns->bdev->bd_disk)) { + req->error_loc = offsetof(struct nvme_rw_command, slba); + status = NVME_SC_LBA_RANGE | NVME_SC_DNR; + goto out; + } + + if (sect & (bdev_zone_sectors(req->ns->bdev) - 1)) { + req->error_loc = offsetof(struct nvme_rw_command, slba); + status = NVME_SC_INVALID_FIELD | NVME_SC_DNR; + goto out; + } + + if (nvmet_use_inline_bvec(req)) { + bio = &req->z.inline_bio; + bio_init(bio, req->ns->bdev, req->inline_bvec, + ARRAY_SIZE(req->inline_bvec), opf); + } else { + bio = bio_alloc(req->ns->bdev, req->sg_cnt, opf, GFP_KERNEL); + } + + bio->bi_end_io = nvmet_bdev_zone_append_bio_done; + bio->bi_iter.bi_sector = sect; + bio->bi_private = req; + if (req->cmd->rw.control & cpu_to_le16(NVME_RW_FUA)) + bio->bi_opf |= REQ_FUA; + + for_each_sg(req->sg, sg, req->sg_cnt, sg_cnt) { + struct page *p = sg_page(sg); + unsigned int l = sg->length; + unsigned int o = sg->offset; + unsigned int ret; + + ret = bio_add_zone_append_page(bio, p, l, o); + if (ret != sg->length) { + status = NVME_SC_INTERNAL; + goto out_put_bio; + } + total_len += sg->length; + } + + if (total_len != nvmet_rw_data_len(req)) { + status = NVME_SC_INTERNAL | NVME_SC_DNR; + goto out_put_bio; + } + + submit_bio(bio); + return; + +out_put_bio: + nvmet_req_bio_put(req, bio); +out: + nvmet_req_complete(req, status); +} + +u16 nvmet_bdev_zns_parse_io_cmd(struct nvmet_req *req) +{ + struct nvme_command *cmd = req->cmd; + + switch (cmd->common.opcode) { + case nvme_cmd_zone_append: + req->execute = nvmet_bdev_execute_zone_append; + return 0; + case nvme_cmd_zone_mgmt_recv: + req->execute = nvmet_bdev_execute_zone_mgmt_recv; + return 0; + case nvme_cmd_zone_mgmt_send: + req->execute = nvmet_bdev_execute_zone_mgmt_send; + return 0; + default: + return nvmet_bdev_parse_io_cmd(req); + } +} -- cgit v1.2.3