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Mon, 26 Sep 2022 05:33:41 +0900 (KST) Received: from epsmtrp2.samsung.com (unknown [182.195.40.14]) by epcas5p2.samsung.com (KnoxPortal) with ESMTPA id 20220925203340epcas5p21bd73962a73c36c7bd56841299c0d229~YNLZy-Zs10635906359epcas5p2b; Sun, 25 Sep 2022 20:33:40 +0000 (GMT) Received: from epsmgms1p2.samsung.com (unknown [182.195.42.42]) by epsmtrp2.samsung.com (KnoxPortal) with ESMTP id 20220925203340epsmtrp21c70fa682ece6af7df1b29015edba3b1~YNLZyUb9Q1586315863epsmtrp2N; Sun, 25 Sep 2022 20:33:40 +0000 (GMT) X-AuditID: b6c32a49-319fb70000016970-33-6330bb245163 Received: from epsmtip1.samsung.com ( [182.195.34.30]) by epsmgms1p2.samsung.com (Symantec Messaging Gateway) with SMTP id 8C.1A.18644.42BB0336; Mon, 26 Sep 2022 05:33:40 +0900 (KST) Received: from localhost.localdomain (unknown [107.110.206.5]) by epsmtip1.samsung.com (KnoxPortal) with ESMTPA id 20220925203338epsmtip1f20161add80368655d19994a5028e4c0~YNLXi3WkZ3161131611epsmtip1X; Sun, 25 Sep 2022 20:33:37 +0000 (GMT) From: Kanchan Joshi To: axboe@kernel.dk, hch@lst.de, kbusch@kernel.org Cc: io-uring@vger.kernel.org, linux-nvme@lists.infradead.org, linux-block@vger.kernel.org, gost.dev@samsung.com, Kanchan Joshi Subject: [PATCH for-next v9 7/7] nvme: wire up fixed buffer support for nvme passthrough Date: Mon, 26 Sep 2022 01:53:04 +0530 Message-Id: <20220925202304.28097-8-joshi.k@samsung.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220925202304.28097-1-joshi.k@samsung.com> MIME-Version: 1.0 X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFupgk+LIzCtJLcpLzFFi42LZdlhTQ1d1t0Gywdt9zBar7/azWdw8sJPJ YuXqo0wW71rPsVgc/f+WzWLSoWuMFntvaVvMX/aU3YHD4/LZUo9NqzrZPDYvqffYfbOBzaNv yypGj8+b5ALYorJtMlITU1KLFFLzkvNTMvPSbZW8g+Od403NDAx1DS0tzJUU8hJzU22VXHwC dN0yc4CuUVIoS8wpBQoFJBYXK+nb2RTll5akKmTkF5fYKqUWpOQUmBToFSfmFpfmpevlpZZY GRoYGJkCFSZkZ7y/2s5e8EO14vSXFSwNjG/luhg5OSQETCS2zdzL0sXIxSEksJtRYtuS+UwQ zidGiR+r1jJCOJ8ZJb6ensUK03Jj7gpmEFtIYBejxJ2HqXBF1443s3UxcnCwCWhKXJhcClIj ImAksf/TSVaQGmaBGYwSqztes4PUCAtESaz7XQFSwyKgKrHs3VcWEJtXwEJi6bRpTBC75CVm XvrODmJzClhKPJm7lRmiRlDi5MwnYPXMQDXNW2czg8yXEPjILvH8aRfYDRICLhILdplBzBGW eHV8CzuELSXx+d1eNgg7WeLSzHNQu0okHu85CGXbS7Se6mcGGcMM9Mr6XfoQq/gken8/YYKY zivR0SYEUa0ocW/SU2joiEs8nLEEyvaQ2NfVxA4JnR5GibVTH7FNYJSfheSDWUg+mIWwbQEj 8ypGydSC4tz01GLTAsO81HJ4tCbn525iBCdJLc8djHcffNA7xMjEwXiIUYKDWUmEN+WibrIQ b0piZVVqUX58UWlOavEhRlNgEE9klhJNzgem6bySeEMTSwMTMzMzE0tjM0Mlcd7FM7SShQTS E0tSs1NTC1KLYPqYODilGpgsS7wSdi/Wm/2OzVVXb32gw7ZiqT+cl9s2Xbup9dVD8+239SrB Bi5MTLO4Gxmeres2WazWuvz7khfCc6+2MqnxL203zuSTOeysW+c7a0WfYt2sU5JH5+3coPRL i1d02+PXLh01CmlC5rJFH5xfXH7FIsm1fGniX8F/8Z+m/T12KyzlJF9VjKF5EEdSzandrgWP hCa+rGOxEgzYHRG0z2cNe/261LiTk65/DywQerHjjFnwVecpPIIe6pnq8bsrlN4tuPcvKEPL pvSBjumyqL9hbBkp09qm39my7PKupO8zbK1yHO0e+jzQ8+9IXcO6Ys5f9YUXDp8PCo0Ndl+V q1Wx7NXP5VbTWYxTOE5OnaHEUpyRaKjFXFScCAD9rXHUGwQAAA== X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFjrLLMWRmVeSWpSXmKPExsWy7bCSnK7KboNkg4UTJCxW3+1ns7h5YCeT xcrVR5ks3rWeY7E4+v8tm8WkQ9cYLfbe0raYv+wpuwOHx+WzpR6bVnWyeWxeUu+x+2YDm0ff llWMHp83yQWwRXHZpKTmZJalFunbJXBlvL/azl7wQ7Xi9JcVLA2Mb+W6GDk5JARMJG7MXcHc xcjFISSwg1Fi39wdTBAJcYnmaz/YIWxhiZX/nrNDFH1klJjX/xHI4eBgE9CUuDC5FKRGRMBM YunhNSwgNcwCcxglLl/eA9YsLBAhsWrSO2YQm0VAVWLZu68sIDavgIXE0mnToJbJS8y89B2s nlPAUuLJ3K3MIPOFgGq2nteCKBeUODnzCVgrM1B589bZzBMYBWYhSc1CklrAyLSKUTK1oDg3 PbfYsMAoL7Vcrzgxt7g0L10vOT93EyM4xLW0djDuWfVB7xAjEwfjIUYJDmYlEd6Ui7rJQrwp iZVVqUX58UWlOanFhxilOViUxHkvdJ2MFxJITyxJzU5NLUgtgskycXBKNTBJ8Pc/82H/9q9j 3VPdl/+iNy09xMbVMVM5Nv7N8e2yN0U+vlLR6edlSTh7+KEES9er6G/SLQuaYvwivY8xfQty u18m9n7XLP2d/+TnTXRuV1dXda87tXbXXp7A7k7ljYHC9Zqtb/fxxhUZXKlsuCY6abFHzhIO gzaRZ2xrl82rK/zHts6zotBi0o/OU89v8VSuWNaaJbTCKfkY6wWmp9f/LGO6KBPIbcN2dGLz 9r7UsEqJk9O0ZNuLNQxeidjN4Gy+E1LynzvNWc99QZMmZ526y5P50vrRLP6KCwWy9XpW2U1b 3qY28wRXZPeZBMHoSS0s83fwu3Kd/cejVpN1IeexSN7xKAXFeoXjvo5rlViKMxINtZiLihMB yUEp0eACAAA= X-CMS-MailID: 20220925203340epcas5p21bd73962a73c36c7bd56841299c0d229 X-Msg-Generator: CA CMS-TYPE: 105P DLP-Filter: Pass X-CFilter-Loop: Reflected X-CMS-RootMailID: 20220925203340epcas5p21bd73962a73c36c7bd56841299c0d229 References: <20220925202304.28097-1-joshi.k@samsung.com> Precedence: bulk List-ID: X-Mailing-List: linux-block@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 helper 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..505a548d4da5 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_bvec(req, &iter); + } 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; }