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Wed, 9 Mar 2022 00:42:31 +0900 (KST) Received: from epsmtrp1.samsung.com (unknown [182.195.40.13]) by epcas5p1.samsung.com (KnoxPortal) with ESMTPA id 20220308152709epcas5p1f9d274a0214dc462c22c278a72d8697c~acVZbAWje1997519975epcas5p1T; Tue, 8 Mar 2022 15:27:09 +0000 (GMT) Received: from epsmgms1p2.samsung.com (unknown [182.195.42.42]) by epsmtrp1.samsung.com (KnoxPortal) with ESMTP id 20220308152709epsmtrp198e5583e2cca027f550c02dfb6f25123~acVZaLrYR0125001250epsmtrp1W; Tue, 8 Mar 2022 15:27:09 +0000 (GMT) X-AuditID: b6c32a49-b13ff70000001917-f6-622779675e51 Received: from epsmtip1.samsung.com ( [182.195.34.30]) by epsmgms1p2.samsung.com (Symantec Messaging Gateway) with SMTP id F6.96.03370.DC577226; Wed, 9 Mar 2022 00:27:09 +0900 (KST) Received: from localhost.localdomain (unknown [107.110.206.5]) by epsmtip1.samsung.com (KnoxPortal) with ESMTPA id 20220308152707epsmtip153ad2d104b96e7f2f57cb6e851c5fda1~acVXZd2Mt3168431684epsmtip1D; Tue, 8 Mar 2022 15:27:07 +0000 (GMT) From: Kanchan Joshi To: axboe@kernel.dk, hch@lst.de, kbusch@kernel.org, asml.silence@gmail.com Cc: io-uring@vger.kernel.org, linux-nvme@lists.infradead.org, linux-block@vger.kernel.org, sbates@raithlin.com, logang@deltatee.com, pankydev8@gmail.com, javier@javigon.com, mcgrof@kernel.org, a.manzanares@samsung.com, joshiiitr@gmail.com, anuj20.g@samsung.com Subject: [PATCH 08/17] nvme: enable passthrough with fixed-buffer Date: Tue, 8 Mar 2022 20:50:56 +0530 Message-Id: <20220308152105.309618-9-joshi.k@samsung.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220308152105.309618-1-joshi.k@samsung.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFjrLJsWRmVeSWpSXmKPExsWy7bCmhm56pXqSwc9ZQhbTDytaNE34y2wx Z9U2RovVd/vZLFauPspk8a71HItF5+kLTBbn3x5msph06Bqjxd5b2hbzlz1lt1jSepzN4saE p4wWa24+ZbH4fGYeqwO/x7Orzxg9ds66y+7RvOAOi8fls6Uem1Z1snlsXlLvsftmA5vHtsUv WT36tqxi9Pi8SS6AKyrbJiM1MSW1SCE1Lzk/JTMv3VbJOzjeOd7UzMBQ19DSwlxJIS8xN9VW ycUnQNctMwfoByWFssScUqBQQGJxsZK+nU1RfmlJqkJGfnGJrVJqQUpOgUmBXnFibnFpXrpe XmqJlaGBgZEpUGFCdsafbxfZC15oVWzd9JW1gXG2chcjJ4eEgInEibN7GbsYuTiEBHYzSrz5 2s8OkhAS+MQocWGzHETiM6PEsSf9rDAd21f0MkEkdjFKTN/2nBWu6ui6KyxdjBwcbAKaEhcm l4I0iAh4Sdy//R6shlmgi0ni7b77bCAJYQFHiembH4KtYxFQldiw6yNYL6+ApcT7yZ4Qy+Ql Zl76DlbCKWAl8fPWVrAjeAUEJU7OfMICYjMD1TRvnc0MMl9C4AiHxOtZP5khml0kHt28zQJh C0u8Or6FHcKWknjZ3wZlF0v8unMUqrmDUeJ6w0yoBnuJi3v+MoEcxAz0zPpd+hBhWYmpp9Yx QSzmk+j9/YQJIs4rsWMejK0ocW/SU2hoiUs8nLEEyvaQ2L1lFzSwehklrq47zziBUWEWkodm IXloFsLqBYzMqxglUwuKc9NTi00LDPNSy+GxnJyfu4kRnK61PHcw3n3wQe8QIxMH4yFGCQ5m JRHe++dVkoR4UxIrq1KL8uOLSnNSiw8xmgIDfCKzlGhyPjBj5JXEG5pYGpiYmZmZWBqbGSqJ 855O35AoJJCeWJKanZpakFoE08fEwSnVwKTFUVC5qOnBcQuvjdwJrV5cFt9O/P3oWSN+eANP tea56BbfIxJxt7SvmM5LFYl8ePthyIQqr77pHjFGd19UzDxTZn154/Ow1Spd88K8LCwN3WTY vVPyfpusS6x+a9dkaeGsx39q4tS7ZxSVn4sbCXyYXPTI2fPn2aW2e1bJifqqax7bvNpp0RfO jTOnivFIHPvsKHdAeY2wT3X1W9aADXtc+iKNjditp0RuXb97WdtXXcPvbhOZ2fZfsV+S8cvy Z1XMvgn8F1pq7u/Qz5rWwyLusmHi+Q8TuS68Douo5OJ+kpDa2+HRNOP4gush+Sz62u2ZHWzf jdcrMTTOFj3vEKFwRuTPbsFdaYfn7tGKU2Ipzkg01GIuKk4EAEmmsJ9gBAAA X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFmpikeLIzCtJLcpLzFFi42LZdlhJTvdsqXqSwZzHYhbTDytaNE34y2wx Z9U2RovVd/vZLFauPspk8a71HItF5+kLTBbn3x5msph06Bqjxd5b2hbzlz1lt1jSepzN4saE p4wWa24+ZbH4fGYeqwO/x7Orzxg9ds66y+7RvOAOi8fls6Uem1Z1snlsXlLvsftmA5vHtsUv WT36tqxi9Pi8SS6AK4rLJiU1J7MstUjfLoEr48+3i+wFL7Qqtm76ytrAOFu5i5GTQ0LARGL7 il4mEFtIYAejxJ2NfBBxcYnmaz/YIWxhiZX/ngPZXEA1Hxklpj3eCtTAwcEmoClxYXIpSI2I QIDEwcbLYDXMAjOYJHqaP7OAJIQFHCWmb34INohFQFViw66PLCC9vAKWEu8ne0LMl5eYeek7 WAmngJXEz1tbWSHusZRYse43G4jNKyAocXLmE7CRzED1zVtnM09gFJiFJDULSWoBI9MqRsnU guLc9NxiwwKjvNRyveLE3OLSvHS95PzcTYzgaNLS2sG4Z9UHvUOMTByMhxglOJiVRHjvn1dJ EuJNSaysSi3Kjy8qzUktPsQozcGiJM57oetkvJBAemJJanZqakFqEUyWiYNTqoHpSAur+syc h1sXL3p/ZL2uLOexL1f8j6rk3isyX3c9wvzkJqZ32lc6l0v/ajGaYhr2etv8dccXSh+flsGU v8pt34FtBtMLnXPtSnU9GLIkDQyXGGx88fJDvjN7/H3z/EsVpSzn3TZoWDNf/n3vwZQPTAst j+4UmMwxTdTvaa3kj2Prl/8IKrbq4O/g4f/54Fz83v5pz/7PnbCNJ7zshpGYwKqW21yLD/n7 7Zr1PeLfrJ0W0yfp7qgRdpA32Wfz6ur6vN27p+Q9l1OWt/df5pFV2rl+jjNrzMZ4/4bP13na nmcLml3prpMt+/Qs/MYUpqtCFpoJj/4L7ZrF8XvrKTGZsn8Ha/adnyHvp3FuwewyXSWW4oxE Qy3mouJEAAC9jsYVAwAA X-CMS-MailID: 20220308152709epcas5p1f9d274a0214dc462c22c278a72d8697c X-Msg-Generator: CA Content-Type: text/plain; charset="utf-8" X-Sendblock-Type: REQ_APPROVE CMS-TYPE: 105P DLP-Filter: Pass X-CFilter-Loop: Reflected X-CMS-RootMailID: 20220308152709epcas5p1f9d274a0214dc462c22c278a72d8697c References: <20220308152105.309618-1-joshi.k@samsung.com> Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org From: Anuj Gupta Add support to carry out passthrough command with pre-mapped buffers. Signed-off-by: Anuj Gupta Signed-off-by: Kanchan Joshi --- block/blk-map.c | 45 +++++++++++++++++++++++++++++++++++++++ drivers/nvme/host/ioctl.c | 27 ++++++++++++++--------- include/linux/blk-mq.h | 2 ++ 3 files changed, 64 insertions(+), 10 deletions(-) diff --git a/block/blk-map.c b/block/blk-map.c index 4526adde0156..027e8216e313 100644 --- a/block/blk-map.c +++ b/block/blk-map.c @@ -8,6 +8,7 @@ #include #include #include +#include #include "blk.h" @@ -577,6 +578,50 @@ int blk_rq_map_user(struct request_queue *q, struct request *rq, } EXPORT_SYMBOL(blk_rq_map_user); +/* Unlike blk_rq_map_user () this is only for fixed-buffer async passthrough. */ +int blk_rq_map_user_fixedb(struct request_queue *q, struct request *rq, + u64 ubuf, unsigned long len, gfp_t gfp_mask, + struct io_uring_cmd *ioucmd) +{ + struct iov_iter iter; + size_t iter_count, nr_segs; + struct bio *bio; + int ret; + + /* + * Talk to io_uring to obtain BVEC iterator for the buffer. + * And use that iterator to form bio/request. + */ + ret = io_uring_cmd_import_fixed(ubuf, len, rq_data_dir(rq), &iter, + ioucmd); + if (unlikely(ret < 0)) + return ret; + iter_count = iov_iter_count(&iter); + nr_segs = iter.nr_segs; + + if (!iter_count || (iter_count >> 9) > queue_max_hw_sectors(q)) + return -EINVAL; + if (nr_segs > queue_max_segments(q)) + return -EINVAL; + /* no iovecs to alloc, as we already have a BVEC iterator */ + bio = bio_alloc(gfp_mask, 0); + if (!bio) + return -ENOMEM; + + ret = bio_iov_iter_get_pages(bio, &iter); + if (ret) + goto out_free; + + blk_rq_bio_prep(rq, bio, nr_segs); + return 0; + +out_free: + bio_release_pages(bio, false); + bio_put(bio); + return ret; +} +EXPORT_SYMBOL(blk_rq_map_user_fixedb); + /** * blk_rq_unmap_user - unmap a request with user data * @bio: start of bio list diff --git a/drivers/nvme/host/ioctl.c b/drivers/nvme/host/ioctl.c index 1df270b47af5..91d893eedc82 100644 --- a/drivers/nvme/host/ioctl.c +++ b/drivers/nvme/host/ioctl.c @@ -123,8 +123,13 @@ static void *nvme_add_user_metadata(struct bio *bio, void __user *ubuf, return ERR_PTR(ret); } +static inline bool nvme_is_fixedb_passthru(struct io_uring_cmd *ioucmd) +{ + return ((ioucmd) && (ioucmd->flags & IO_URING_F_UCMD_FIXEDBUFS)); +} + 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, struct io_uring_cmd *ioucmd) @@ -152,8 +157,12 @@ static int nvme_submit_user_cmd(struct request_queue *q, nvme_req(req)->flags |= NVME_REQ_USERCMD; if (ubuffer && bufflen) { - ret = blk_rq_map_user(q, req, NULL, ubuffer, bufflen, - GFP_KERNEL); + if (likely(nvme_is_fixedb_passthru(ioucmd))) + ret = blk_rq_map_user_fixedb(q, req, ubuffer, bufflen, + GFP_KERNEL, ioucmd); + else + ret = blk_rq_map_user(q, req, NULL, nvme_to_user_ptr(ubuffer), + bufflen, GFP_KERNEL); if (ret) goto out; bio = req->bio; @@ -260,9 +269,8 @@ 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, - metadata, meta_len, lower_32_bits(io.slba), NULL, 0, - NULL); + io.addr, length, metadata, meta_len, + lower_32_bits(io.slba), NULL, 0, NULL); } static bool nvme_validate_passthru_nsid(struct nvme_ctrl *ctrl, @@ -314,9 +322,8 @@ 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, - nvme_to_user_ptr(cmd.metadata), cmd.metadata_len, - 0, &result, timeout, NULL); + cmd.addr, cmd.data_len, nvme_to_user_ptr(cmd.metadata), + cmd.metadata_len, 0, &result, timeout, NULL); if (status >= 0) { if (put_user(result, &ucmd->result)) @@ -368,7 +375,7 @@ static int nvme_user_cmd64(struct nvme_ctrl *ctrl, struct nvme_ns *ns, timeout = msecs_to_jiffies(cptr->timeout_ms); status = nvme_submit_user_cmd(ns ? ns->queue : ctrl->admin_q, &c, - nvme_to_user_ptr(cptr->addr), cptr->data_len, + cptr->addr, cptr->data_len, nvme_to_user_ptr(cptr->metadata), cptr->metadata_len, 0, &cptr->result, timeout, ioucmd); diff --git a/include/linux/blk-mq.h b/include/linux/blk-mq.h index d319ffa59354..48bcfd194bdc 100644 --- a/include/linux/blk-mq.h +++ b/include/linux/blk-mq.h @@ -966,6 +966,8 @@ struct rq_map_data { int blk_rq_map_user(struct request_queue *, struct request *, struct rq_map_data *, void __user *, unsigned long, gfp_t); +int blk_rq_map_user_fixedb(struct request_queue *, struct request *, + u64 ubuf, unsigned long, gfp_t, struct io_uring_cmd *); int blk_rq_map_user_iov(struct request_queue *, struct request *, struct rq_map_data *, const struct iov_iter *, gfp_t); int blk_rq_unmap_user(struct bio *); -- 2.25.1