drivers/nvme/target/io-cmd-bdev.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * NVMe I/O command implementation.
   4  * Copyright (c) 2015-2016 HGST, a Western Digital Company.
   5  */
   6 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
   7 #include <linux/blkdev.h>
   8 #include <linux/module.h>
   9 #include "nvmet.h"
  10
  11 void nvmet_bdev_set_limits(struct block_device *bdev, struct nvme_id_ns *id)
  12 {
  13         const struct queue_limits *ql = &bdev_get_queue(bdev)->limits;
  14         /* Number of logical blocks per physical block. */
  15         const u32 lpp = ql->physical_block_size / ql->logical_block_size;
  16         /* Logical blocks per physical block, 0's based. */
  17         const __le16 lpp0b = to0based(lpp);
  18
  19         /*
  20          * For NVMe 1.2 and later, bit 1 indicates that the fields NAWUN,
  21          * NAWUPF, and NACWU are defined for this namespace and should be
  22          * used by the host for this namespace instead of the AWUN, AWUPF,
  23          * and ACWU fields in the Identify Controller data structure. If
  24          * any of these fields are zero that means that the corresponding
  25          * field from the identify controller data structure should be used.
  26          */
  27         id->nsfeat |= 1 << 1;
  28         id->nawun = lpp0b;
  29         id->nawupf = lpp0b;
  30         id->nacwu = lpp0b;
  31
  32         /*
  33          * Bit 4 indicates that the fields NPWG, NPWA, NPDG, NPDA, and
  34          * NOWS are defined for this namespace and should be used by
  35          * the host for I/O optimization.
  36          */
  37         id->nsfeat |= 1 << 4;
  38         /* NPWG = Namespace Preferred Write Granularity. 0's based */
  39         id->npwg = lpp0b;
  40         /* NPWA = Namespace Preferred Write Alignment. 0's based */
  41         id->npwa = id->npwg;
  42         /* NPDG = Namespace Preferred Deallocate Granularity. 0's based */
  43         id->npdg = to0based(ql->discard_granularity / ql->logical_block_size);
  44         /* NPDG = Namespace Preferred Deallocate Alignment */
  45         id->npda = id->npdg;
  46         /* NOWS = Namespace Optimal Write Size */
  47         id->nows = to0based(ql->io_opt / ql->logical_block_size);
  48 }
  49
  50 int nvmet_bdev_ns_enable(struct nvmet_ns *ns)
  51 {
  52         int ret;
  53
  54         ns->bdev = blkdev_get_by_path(ns->device_path,
  55                         FMODE_READ | FMODE_WRITE, NULL);
  56         if (IS_ERR(ns->bdev)) {
  57                 ret = PTR_ERR(ns->bdev);
  58                 if (ret != -ENOTBLK) {
  59                         pr_err("failed to open block device %s: (%ld)\n",
  60                                         ns->device_path, PTR_ERR(ns->bdev));
  61                 }
  62                 ns->bdev = NULL;
  63                 return ret;
  64         }
  65         ns->size = i_size_read(ns->bdev->bd_inode);
  66         ns->blksize_shift = blksize_bits(bdev_logical_block_size(ns->bdev));
  67         return 0;
  68 }
  69
  70 void nvmet_bdev_ns_disable(struct nvmet_ns *ns)
  71 {
  72         if (ns->bdev) {
  73                 blkdev_put(ns->bdev, FMODE_WRITE | FMODE_READ);
  74                 ns->bdev = NULL;
  75         }
  76 }
  77
  78 static u16 blk_to_nvme_status(struct nvmet_req *req, blk_status_t blk_sts)
  79 {
  80         u16 status = NVME_SC_SUCCESS;
  81
  82         if (likely(blk_sts == BLK_STS_OK))
  83                 return status;
  84         /*
  85          * Right now there exists M : 1 mapping between block layer error
  86          * to the NVMe status code (see nvme_error_status()). For consistency,
  87          * when we reverse map we use most appropriate NVMe Status code from
  88          * the group of the NVMe staus codes used in the nvme_error_status().
  89          */
  90         switch (blk_sts) {
  91         case BLK_STS_NOSPC:
  92                 status = NVME_SC_CAP_EXCEEDED | NVME_SC_DNR;
  93                 req->error_loc = offsetof(struct nvme_rw_command, length);
  94                 break;
  95         case BLK_STS_TARGET:
  96                 status = NVME_SC_LBA_RANGE | NVME_SC_DNR;
  97                 req->error_loc = offsetof(struct nvme_rw_command, slba);
  98                 break;
  99         case BLK_STS_NOTSUPP:
 100                 req->error_loc = offsetof(struct nvme_common_command, opcode);
 101                 switch (req->cmd->common.opcode) {
 102                 case nvme_cmd_dsm:
 103                 case nvme_cmd_write_zeroes:
 104                         status = NVME_SC_ONCS_NOT_SUPPORTED | NVME_SC_DNR;
 105                         break;
 106                 default:
 107                         status = NVME_SC_INVALID_OPCODE | NVME_SC_DNR;
 108                 }
 109                 break;
 110         case BLK_STS_MEDIUM:
 111                 status = NVME_SC_ACCESS_DENIED;
 112                 req->error_loc = offsetof(struct nvme_rw_command, nsid);
 113                 break;
 114         case BLK_STS_IOERR:
 115                 /* fallthru */
 116         default:
 117                 status = NVME_SC_INTERNAL | NVME_SC_DNR;
 118                 req->error_loc = offsetof(struct nvme_common_command, opcode);
 119         }
 120
 121         switch (req->cmd->common.opcode) {
 122         case nvme_cmd_read:
 123         case nvme_cmd_write:
 124                 req->error_slba = le64_to_cpu(req->cmd->rw.slba);
 125                 break;
 126         case nvme_cmd_write_zeroes:
 127                 req->error_slba =
 128                         le64_to_cpu(req->cmd->write_zeroes.slba);
 129                 break;
 130         default:
 131                 req->error_slba = 0;
 132         }
 133         return status;
 134 }
 135
 136 static void nvmet_bio_done(struct bio *bio)
 137 {
 138         struct nvmet_req *req = bio->bi_private;
 139
 140         nvmet_req_complete(req, blk_to_nvme_status(req, bio->bi_status));
 141         if (bio != &req->b.inline_bio)
 142                 bio_put(bio);
 143 }
 144
 145 static void nvmet_bdev_execute_rw(struct nvmet_req *req)
 146 {
 147         int sg_cnt = req->sg_cnt;
 148         struct bio *bio;
 149         struct scatterlist *sg;
 150         struct blk_plug plug;
 151         sector_t sector;
 152         int op, i;
 153
 154         if (!nvmet_check_data_len(req, nvmet_rw_len(req)))
 155                 return;
 156
 157         if (!req->sg_cnt) {
 158                 nvmet_req_complete(req, 0);
 159                 return;
 160         }
 161
 162         if (req->cmd->rw.opcode == nvme_cmd_write) {
 163                 op = REQ_OP_WRITE | REQ_SYNC | REQ_IDLE;
 164                 if (req->cmd->rw.control & cpu_to_le16(NVME_RW_FUA))
 165                         op |= REQ_FUA;
 166         } else {
 167                 op = REQ_OP_READ;
 168         }
 169
 170         if (is_pci_p2pdma_page(sg_page(req->sg)))
 171                 op |= REQ_NOMERGE;
 172
 173         sector = le64_to_cpu(req->cmd->rw.slba);
 174         sector <<= (req->ns->blksize_shift - 9);
 175
 176         if (req->transfer_len <= NVMET_MAX_INLINE_DATA_LEN) {
 177                 bio = &req->b.inline_bio;
 178                 bio_init(bio, req->inline_bvec, ARRAY_SIZE(req->inline_bvec));
 179         } else {
 180                 bio = bio_alloc(GFP_KERNEL, min(sg_cnt, BIO_MAX_PAGES));
 181         }
 182         bio_set_dev(bio, req->ns->bdev);
 183         bio->bi_iter.bi_sector = sector;
 184         bio->bi_private = req;
 185         bio->bi_end_io = nvmet_bio_done;
 186         bio->bi_opf = op;
 187
 188         blk_start_plug(&plug);
 189         for_each_sg(req->sg, sg, req->sg_cnt, i) {
 190                 while (bio_add_page(bio, sg_page(sg), sg->length, sg->offset)
 191                                 != sg->length) {
 192                         struct bio *prev = bio;
 193
 194                         bio = bio_alloc(GFP_KERNEL, min(sg_cnt, BIO_MAX_PAGES));
 195                         bio_set_dev(bio, req->ns->bdev);
 196                         bio->bi_iter.bi_sector = sector;
 197                         bio->bi_opf = op;
 198
 199                         bio_chain(bio, prev);
 200                         submit_bio(prev);
 201                 }
 202
 203                 sector += sg->length >> 9;
 204                 sg_cnt--;
 205         }
 206
 207         submit_bio(bio);
 208         blk_finish_plug(&plug);
 209 }
 210
 211 static void nvmet_bdev_execute_flush(struct nvmet_req *req)
 212 {
 213         struct bio *bio = &req->b.inline_bio;
 214
 215         if (!nvmet_check_data_len(req, 0))
 216                 return;
 217
 218         bio_init(bio, req->inline_bvec, ARRAY_SIZE(req->inline_bvec));
 219         bio_set_dev(bio, req->ns->bdev);
 220         bio->bi_private = req;
 221         bio->bi_end_io = nvmet_bio_done;
 222         bio->bi_opf = REQ_OP_WRITE | REQ_PREFLUSH;
 223
 224         submit_bio(bio);
 225 }
 226
 227 u16 nvmet_bdev_flush(struct nvmet_req *req)
 228 {
 229         if (blkdev_issue_flush(req->ns->bdev, GFP_KERNEL, NULL))
 230                 return NVME_SC_INTERNAL | NVME_SC_DNR;
 231         return 0;
 232 }
 233
 234 static u16 nvmet_bdev_discard_range(struct nvmet_req *req,
 235                 struct nvme_dsm_range *range, struct bio **bio)
 236 {
 237         struct nvmet_ns *ns = req->ns;
 238         int ret;
 239
 240         ret = __blkdev_issue_discard(ns->bdev,
 241                         le64_to_cpu(range->slba) << (ns->blksize_shift - 9),
 242                         le32_to_cpu(range->nlb) << (ns->blksize_shift - 9),
 243                         GFP_KERNEL, 0, bio);
 244         if (ret && ret != -EOPNOTSUPP) {
 245                 req->error_slba = le64_to_cpu(range->slba);
 246                 return errno_to_nvme_status(req, ret);
 247         }
 248         return NVME_SC_SUCCESS;
 249 }
 250
 251 static void nvmet_bdev_execute_discard(struct nvmet_req *req)
 252 {
 253         struct nvme_dsm_range range;
 254         struct bio *bio = NULL;
 255         int i;
 256         u16 status;
 257
 258         for (i = 0; i <= le32_to_cpu(req->cmd->dsm.nr); i++) {
 259                 status = nvmet_copy_from_sgl(req, i * sizeof(range), &range,
 260                                 sizeof(range));
 261                 if (status)
 262                         break;
 263
 264                 status = nvmet_bdev_discard_range(req, &range, &bio);
 265                 if (status)
 266                         break;
 267         }
 268
 269         if (bio) {
 270                 bio->bi_private = req;
 271                 bio->bi_end_io = nvmet_bio_done;
 272                 if (status)
 273                         bio_io_error(bio);
 274                 else
 275                         submit_bio(bio);
 276         } else {
 277                 nvmet_req_complete(req, status);
 278         }
 279 }
 280
 281 static void nvmet_bdev_execute_dsm(struct nvmet_req *req)
 282 {
 283         if (!nvmet_check_data_len(req, nvmet_dsm_len(req)))
 284                 return;
 285
 286         switch (le32_to_cpu(req->cmd->dsm.attributes)) {
 287         case NVME_DSMGMT_AD:
 288                 nvmet_bdev_execute_discard(req);
 289                 return;
 290         case NVME_DSMGMT_IDR:
 291         case NVME_DSMGMT_IDW:
 292         default:
 293                 /* Not supported yet */
 294                 nvmet_req_complete(req, 0);
 295                 return;
 296         }
 297 }
 298
 299 static void nvmet_bdev_execute_write_zeroes(struct nvmet_req *req)
 300 {
 301         struct nvme_write_zeroes_cmd *write_zeroes = &req->cmd->write_zeroes;
 302         struct bio *bio = NULL;
 303         sector_t sector;
 304         sector_t nr_sector;
 305         int ret;
 306
 307         if (!nvmet_check_data_len(req, 0))
 308                 return;
 309
 310         sector = le64_to_cpu(write_zeroes->slba) <<
 311                 (req->ns->blksize_shift - 9);
 312         nr_sector = (((sector_t)le16_to_cpu(write_zeroes->length) + 1) <<
 313                 (req->ns->blksize_shift - 9));
 314
 315         ret = __blkdev_issue_zeroout(req->ns->bdev, sector, nr_sector,
 316                         GFP_KERNEL, &bio, 0);
 317         if (bio) {
 318                 bio->bi_private = req;
 319                 bio->bi_end_io = nvmet_bio_done;
 320                 submit_bio(bio);
 321         } else {
 322                 nvmet_req_complete(req, errno_to_nvme_status(req, ret));
 323         }
 324 }
 325
 326 u16 nvmet_bdev_parse_io_cmd(struct nvmet_req *req)
 327 {
 328         struct nvme_command *cmd = req->cmd;
 329
 330         switch (cmd->common.opcode) {
 331         case nvme_cmd_read:
 332         case nvme_cmd_write:
 333                 req->execute = nvmet_bdev_execute_rw;
 334                 return 0;
 335         case nvme_cmd_flush:
 336                 req->execute = nvmet_bdev_execute_flush;
 337                 return 0;
 338         case nvme_cmd_dsm:
 339                 req->execute = nvmet_bdev_execute_dsm;
 340                 return 0;
 341         case nvme_cmd_write_zeroes:
 342                 req->execute = nvmet_bdev_execute_write_zeroes;
 343                 return 0;
 344         default:
 345                 pr_err("unhandled cmd %d on qid %d\n", cmd->common.opcode,
 346                        req->sq->qid);
 347                 req->error_loc = offsetof(struct nvme_common_command, opcode);
 348                 return NVME_SC_INVALID_OPCODE | NVME_SC_DNR;
 349         }
 350 }