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/*
* NVMe I/O command implementation.
* Copyright (c) 2015-2016 HGST, a Western Digital Company.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/blkdev.h>
#include <linux/module.h>
#include "nvmet.h"
static void nvmet_bio_done(struct bio *bio)
{
struct nvmet_req *req = bio->bi_private;
nvmet_req_complete(req,
bio->bi_error ? NVME_SC_INTERNAL | NVME_SC_DNR : 0);
if (bio != &req->inline_bio)
bio_put(bio);
}
static inline u32 nvmet_rw_len(struct nvmet_req *req)
{
return ((u32)le16_to_cpu(req->cmd->rw.length) + 1) <<
req->ns->blksize_shift;
}
static void nvmet_inline_bio_init(struct nvmet_req *req)
{
struct bio *bio = &req->inline_bio;
bio_init(bio);
bio->bi_max_vecs = NVMET_MAX_INLINE_BIOVEC;
bio->bi_io_vec = req->inline_bvec;
}
static void nvmet_execute_rw(struct nvmet_req *req)
{
int sg_cnt = req->sg_cnt;
struct scatterlist *sg;
struct bio *bio;
sector_t sector;
blk_qc_t cookie;
int op, op_flags = 0, i;
if (!req->sg_cnt) {
nvmet_req_complete(req, 0);
return;
}
if (req->cmd->rw.opcode == nvme_cmd_write) {
op = REQ_OP_WRITE;
op_flags = REQ_SYNC | REQ_IDLE;
if (req->cmd->rw.control & cpu_to_le16(NVME_RW_FUA))
op_flags |= REQ_FUA;
} else {
op = REQ_OP_READ;
}
sector = le64_to_cpu(req->cmd->rw.slba);
sector <<= (req->ns->blksize_shift - 9);
nvmet_inline_bio_init(req);
bio = &req->inline_bio;
bio->bi_bdev = req->ns->bdev;
bio->bi_iter.bi_sector = sector;
bio->bi_private = req;
bio->bi_end_io = nvmet_bio_done;
bio_set_op_attrs(bio, op, op_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;
bio = bio_alloc(GFP_KERNEL, min(sg_cnt, BIO_MAX_PAGES));
bio->bi_bdev = req->ns->bdev;
bio->bi_iter.bi_sector = sector;
bio_set_op_attrs(bio, op, op_flags);
bio_chain(bio, prev);
cookie = submit_bio(prev);
}
sector += sg->length >> 9;
sg_cnt--;
}
cookie = submit_bio(bio);
blk_poll(bdev_get_queue(req->ns->bdev), cookie);
}
static void nvmet_execute_flush(struct nvmet_req *req)
{
struct bio *bio;
nvmet_inline_bio_init(req);
bio = &req->inline_bio;
bio->bi_bdev = 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);
}
static u16 nvmet_discard_range(struct nvmet_ns *ns,
struct nvme_dsm_range *range, struct bio **bio)
{
if (__blkdev_issue_discard(ns->bdev,
le64_to_cpu(range->slba) << (ns->blksize_shift - 9),
le32_to_cpu(range->nlb) << (ns->blksize_shift - 9),
GFP_KERNEL, 0, bio))
return NVME_SC_INTERNAL | NVME_SC_DNR;
return 0;
}
static void nvmet_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_discard_range(req->ns, &range, &bio);
if (status)
break;
}
if (bio) {
bio->bi_private = req;
bio->bi_end_io = nvmet_bio_done;
if (status) {
bio->bi_error = -EIO;
bio_endio(bio);
} else {
submit_bio(bio);
}
} else {
nvmet_req_complete(req, status);
}
}
static void nvmet_execute_dsm(struct nvmet_req *req)
{
switch (le32_to_cpu(req->cmd->dsm.attributes)) {
case NVME_DSMGMT_AD:
nvmet_execute_discard(req);
return;
case NVME_DSMGMT_IDR:
case NVME_DSMGMT_IDW:
default:
/* Not supported yet */
nvmet_req_complete(req, 0);
return;
}
}
int nvmet_parse_io_cmd(struct nvmet_req *req)
{
struct nvme_command *cmd = req->cmd;
if (unlikely(!(req->sq->ctrl->cc & NVME_CC_ENABLE))) {
pr_err("nvmet: got io cmd %d while CC.EN == 0\n",
cmd->common.opcode);
req->ns = NULL;
return NVME_SC_CMD_SEQ_ERROR | NVME_SC_DNR;
}
if (unlikely(!(req->sq->ctrl->csts & NVME_CSTS_RDY))) {
pr_err("nvmet: got io cmd %d while CSTS.RDY == 0\n",
cmd->common.opcode);
req->ns = NULL;
return NVME_SC_CMD_SEQ_ERROR | NVME_SC_DNR;
}
req->ns = nvmet_find_namespace(req->sq->ctrl, cmd->rw.nsid);
if (!req->ns)
return NVME_SC_INVALID_NS | NVME_SC_DNR;
switch (cmd->common.opcode) {
case nvme_cmd_read:
case nvme_cmd_write:
req->execute = nvmet_execute_rw;
req->data_len = nvmet_rw_len(req);
return 0;
case nvme_cmd_flush:
req->execute = nvmet_execute_flush;
req->data_len = 0;
return 0;
case nvme_cmd_dsm:
req->execute = nvmet_execute_dsm;
req->data_len = le32_to_cpu(cmd->dsm.nr + 1) *
sizeof(struct nvme_dsm_range);
return 0;
default:
pr_err("nvmet: unhandled cmd %d\n", cmd->common.opcode);
return NVME_SC_INVALID_OPCODE | NVME_SC_DNR;
}
}
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