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charset="utf-8" CMS-TYPE: 105P DLP-Filter: Pass X-CFilter-Loop: Reflected X-CMS-RootMailID: 20220927174642epcas5p1dafa31776d4eb8180e18f149ed25640c References: <20220927173610.7794-1-joshi.k@samsung.com> Precedence: bulk List-ID: X-Mailing-List: io-uring@vger.kernel.org if io_uring sends passthrough command with IORING_URING_CMD_FIXED flag, use the pre-registered buffer for IO (non-vectored variant). Pass the buffer/length to io_uring and get the bvec iterator for the range. Next, pass this bvec to block-layer and obtain a bio/request for subsequent processing. While at it, modify nvme_submit_user_cmd to take ubuffer as plain integer argument, and do away with nvme_to_user_ptr conversion in callers. Signed-off-by: Kanchan Joshi --- drivers/nvme/host/ioctl.c | 44 +++++++++++++++++++++++++-------------- 1 file changed, 28 insertions(+), 16 deletions(-) diff --git a/drivers/nvme/host/ioctl.c b/drivers/nvme/host/ioctl.c index b9f17dc87de9..1a45246f0d7a 100644 --- a/drivers/nvme/host/ioctl.c +++ b/drivers/nvme/host/ioctl.c @@ -83,9 +83,10 @@ static struct request *nvme_alloc_user_request(struct request_queue *q, return req; } -static int nvme_map_user_request(struct request *req, void __user *ubuffer, +static int nvme_map_user_request(struct request *req, u64 ubuffer, unsigned bufflen, void __user *meta_buffer, unsigned meta_len, - u32 meta_seed, void **metap, bool vec) + u32 meta_seed, void **metap, struct io_uring_cmd *ioucmd, + bool vec) { struct request_queue *q = req->q; struct nvme_ns *ns = q->queuedata; @@ -93,23 +94,34 @@ static int nvme_map_user_request(struct request *req, void __user *ubuffer, struct bio *bio = NULL; void *meta = NULL; int ret; + bool fixedbufs = ioucmd && (ioucmd->flags & IORING_URING_CMD_FIXED); - if (!vec) - ret = blk_rq_map_user(q, req, NULL, ubuffer, bufflen, - GFP_KERNEL); - else { + if (vec) { struct iovec fast_iov[UIO_FASTIOV]; struct iovec *iov = fast_iov; struct iov_iter iter; - ret = import_iovec(rq_data_dir(req), ubuffer, bufflen, - UIO_FASTIOV, &iov, &iter); + /* fixedbufs is only for non-vectored io */ + WARN_ON_ONCE(fixedbufs); + ret = import_iovec(rq_data_dir(req), nvme_to_user_ptr(ubuffer), + bufflen, UIO_FASTIOV, &iov, &iter); if (ret < 0) goto out; ret = blk_rq_map_user_iov(q, req, NULL, &iter, GFP_KERNEL); kfree(iov); - } + } else if (fixedbufs) { + struct iov_iter iter; + + ret = io_uring_cmd_import_fixed(ubuffer, bufflen, + rq_data_dir(req), &iter, ioucmd); + if (ret < 0) + goto out; + ret = blk_rq_map_user_iov(q, req, NULL, &iter, GFP_KERNEL); + } else + ret = blk_rq_map_user(q, req, NULL, + nvme_to_user_ptr(ubuffer), bufflen, + GFP_KERNEL); if (ret) goto out; bio = req->bio; @@ -136,7 +148,7 @@ static int nvme_map_user_request(struct request *req, void __user *ubuffer, } static int nvme_submit_user_cmd(struct request_queue *q, - struct nvme_command *cmd, void __user *ubuffer, + struct nvme_command *cmd, u64 ubuffer, unsigned bufflen, void __user *meta_buffer, unsigned meta_len, u32 meta_seed, u64 *result, unsigned timeout, bool vec) { @@ -152,7 +164,7 @@ static int nvme_submit_user_cmd(struct request_queue *q, req->timeout = timeout; if (ubuffer && bufflen) { ret = nvme_map_user_request(req, ubuffer, bufflen, meta_buffer, - meta_len, meta_seed, &meta, vec); + meta_len, meta_seed, &meta, NULL, vec); if (ret) goto out; } @@ -231,7 +243,7 @@ static int nvme_submit_io(struct nvme_ns *ns, struct nvme_user_io __user *uio) c.rw.appmask = cpu_to_le16(io.appmask); return nvme_submit_user_cmd(ns->queue, &c, - nvme_to_user_ptr(io.addr), length, + io.addr, length, metadata, meta_len, lower_32_bits(io.slba), NULL, 0, false); } @@ -285,7 +297,7 @@ static int nvme_user_cmd(struct nvme_ctrl *ctrl, struct nvme_ns *ns, timeout = msecs_to_jiffies(cmd.timeout_ms); status = nvme_submit_user_cmd(ns ? ns->queue : ctrl->admin_q, &c, - nvme_to_user_ptr(cmd.addr), cmd.data_len, + cmd.addr, cmd.data_len, nvme_to_user_ptr(cmd.metadata), cmd.metadata_len, 0, &result, timeout, false); @@ -331,7 +343,7 @@ static int nvme_user_cmd64(struct nvme_ctrl *ctrl, struct nvme_ns *ns, timeout = msecs_to_jiffies(cmd.timeout_ms); status = nvme_submit_user_cmd(ns ? ns->queue : ctrl->admin_q, &c, - nvme_to_user_ptr(cmd.addr), cmd.data_len, + cmd.addr, cmd.data_len, nvme_to_user_ptr(cmd.metadata), cmd.metadata_len, 0, &cmd.result, timeout, vec); @@ -475,9 +487,9 @@ static int nvme_uring_cmd_io(struct nvme_ctrl *ctrl, struct nvme_ns *ns, req->timeout = d.timeout_ms ? msecs_to_jiffies(d.timeout_ms) : 0; if (d.addr && d.data_len) { - ret = nvme_map_user_request(req, nvme_to_user_ptr(d.addr), + ret = nvme_map_user_request(req, d.addr, d.data_len, nvme_to_user_ptr(d.metadata), - d.metadata_len, 0, &meta, vec); + d.metadata_len, 0, &meta, ioucmd, vec); if (ret) goto out_err; } -- 2.25.1