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Sat, 6 Aug 2022 00:53:14 +0900 (KST) Received: from epsmtrp1.samsung.com (unknown [182.195.40.13]) by epcas5p2.samsung.com (KnoxPortal) with ESMTPA id 20220805155313epcas5p2d35d22831bd07ef33fbdc28bd99ae1d0~Ifc_2719A0917409174epcas5p24; Fri, 5 Aug 2022 15:53:13 +0000 (GMT) Received: from epsmgms1p2.samsung.com (unknown [182.195.42.42]) by epsmtrp1.samsung.com (KnoxPortal) with ESMTP id 20220805155313epsmtrp1f2f0d47e45eedd08b64029b060919afb~Ifc_2JopT0820308203epsmtrp1i; Fri, 5 Aug 2022 15:53:13 +0000 (GMT) X-AuditID: b6c32a49-86fff700000025be-6a-62ed3ce93da0 Received: from epsmtip2.samsung.com ( [182.195.34.31]) by epsmgms1p2.samsung.com (Symantec Messaging Gateway) with SMTP id 3D.FD.08802.9EC3DE26; Sat, 6 Aug 2022 00:53:13 +0900 (KST) Received: from localhost.localdomain (unknown [107.110.206.5]) by epsmtip2.samsung.com (KnoxPortal) with ESMTPA id 20220805155312epsmtip267b29e932ee9955ee8efa409b2995a04~Ifc9Y8xbW1265212652epsmtip28; Fri, 5 Aug 2022 15:53:12 +0000 (GMT) From: Kanchan Joshi To: axboe@kernel.dk, hch@lst.de Cc: io-uring@vger.kernel.org, linux-nvme@lists.infradead.org, linux-block@vger.kernel.org, ming.lei@redhat.com, joshiiitr@gmail.com, gost.dev@samsung.com, Kanchan Joshi , Anuj Gupta Subject: [PATCH 4/4] nvme: wire up async polling for io passthrough commands Date: Fri, 5 Aug 2022 21:12:26 +0530 Message-Id: <20220805154226.155008-5-joshi.k@samsung.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220805154226.155008-1-joshi.k@samsung.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFprOJsWRmVeSWpSXmKPExsWy7bCmuu4rm7dJBtM3MVs0TfjLbLH6bj+b xc0DO5ksVq4+ymTxrvUci8XR/2/ZLM6/PcxksfeWtsX8ZU/ZLQ5NbmZy4PLYOesuu8fls6Ue m5fUe+y+2cDm8X7fVTaPvi2rGD0+b5ILYI/KtslITUxJLVJIzUvOT8nMS7dV8g6Od443NTMw 1DW0tDBXUshLzE21VXLxCdB1y8wBOk5JoSwxpxQoFJBYXKykb2dTlF9akqqQkV9cYquUWpCS U2BSoFecmFtcmpeul5daYmVoYGBkClSYkJ1x+8Yc5oI+k4qtPQdZGhiPaHcxcnBICJhIXP0m 38XIxSEksJtR4uvmHywQzidGieP3DrF1MXICOZ8ZJd49igaxQRr2/74GFd/FKHHhgihEA1BN /+FmJpCpbAKaEhcml4LUiAjIS3y5vRZsKLPAc0aJpt/N7CAJYQEfiab7PUwgNouAqsTuawtY QGxeAUuJmUuPMkIsk5eYeek7WD2ngJVE6+EtzBA1ghInZz4Bq2cGqmneOpsZZIGEQCeHxOor i5kgml0k/n/th7KFJV4d38IOYUtJvOxvg7KTJS7NPAdVUyLxeM9BKNteovVUPzPIM8xAz6zf pQ+xi0+i9/cTJkjI8Up0tAlBVCtK3Jv0lBXCFpd4OGMJlO0hMXP/fyZI+PQySmxq+8EygVF+ FpIXZiF5YRbCtgWMzKsYJVMLinPTU4tNCwzzUsvh0Zqcn7uJEZxCtTx3MN598EHvECMTB+Mh RgkOZiUR3p87XicJ8aYkVlalFuXHF5XmpBYfYjQFhvFEZinR5HxgEs8riTc0sTQwMTMzM7E0 NjNUEuf1uropSUggPbEkNTs1tSC1CKaPiYNTqoGpc/Px4A+FRx+GJvOwn10fdauM+evVyD3K 6WbFT8/PzOa+l/G8IL1tlajkrevvnP03chms84nfsbj00y2RP2ZpxYf7w32NjAVS5usqO7Cv Z+9YdOTQ0b8LPY0z755pNbqVLyxy6LZvzPtJxzacqbi7y7f1oV4h4wyJhFqzouLzt0ymbfA/ saV0dbaaMNP8CTwsyctVvuWGsLmzb3x8pIPjjnl8uuHJopXey05tjr24Yw/HAXe2IN/9K0Jk SsuvdqWIz3W9JfTrkreiv+HdjV5vtgkKNR6LY/jNEq6X1jhr3rNDt2LX2B9d32KTcOSX8+wZ 0pF725o0dV5vbTy9oUni3tXpNoovzlbULF22OzpPiaU4I9FQi7moOBEAdtQlICoEAAA= X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFrrDLMWRmVeSWpSXmKPExsWy7bCSvO5Lm7dJBpOnaVg0TfjLbLH6bj+b xc0DO5ksVq4+ymTxrvUci8XR/2/ZLM6/PcxksfeWtsX8ZU/ZLQ5NbmZy4PLYOesuu8fls6Ue m5fUe+y+2cDm8X7fVTaPvi2rGD0+b5ILYI/isklJzcksSy3St0vgyrh9Yw5zQZ9JxdaegywN jEe0uxg5OSQETCT2/77G1sXIxSEksINRouvAYSaIhLhE87Uf7BC2sMTKf8/ZIYo+Mkr82rkV yOHgYBPQlLgwuRSkRkRAUWLjxyZGkBpmgfeMEnfm/WQGSQgL+Eg03e8BG8oioCqx+9oCFhCb V8BSYubSo4wQC+QlZl76DraMU8BKovXwFmaQ+UJANfPvcEGUC0qcnPkErJUZqLx562zmCYwC s5CkZiFJLWBkWsUomVpQnJueW2xYYJSXWq5XnJhbXJqXrpecn7uJERwBWlo7GPes+qB3iJGJ g/EQowQHs5II788dr5OEeFMSK6tSi/Lji0pzUosPMUpzsCiJ817oOhkvJJCeWJKanZpakFoE k2Xi4JRqYBK6bdlz+/9Vt8/8UdseOoQUhJ2QPHLX5fmCLnPR8jiZrgbV3zcdLqb0N2+aorz1 6amgWpcNM9bMuyibbnm6ZIvTsulactN3rXnwafeqn8YzKgunmf7XVlS87fVmRv7fbfbulzfw vBO9pZfAEuEX+GuSTligl/jNFwFqIW/q/v7bzC2UPGeJWXO/P49csfDF9tg9k8wbtzlOfnGV 729N23vW82mT3z+o1Hb3Z17UdMiu3a/rSeuDpriFwopPTBounuL4rbuTY3maadStnqdndC5J MFXt8tQpYBLWD9FWdrL/kvXofHH1n57g+971QnxbF95UCtD58q9SpWqdnsLys49bJuoHJDJq 1PqvTva7osRSnJFoqMVcVJwIAHoMtjHvAgAA X-CMS-MailID: 20220805155313epcas5p2d35d22831bd07ef33fbdc28bd99ae1d0 X-Msg-Generator: CA Content-Type: text/plain; charset="utf-8" CMS-TYPE: 105P DLP-Filter: Pass X-CFilter-Loop: Reflected X-CMS-RootMailID: 20220805155313epcas5p2d35d22831bd07ef33fbdc28bd99ae1d0 References: <20220805154226.155008-1-joshi.k@samsung.com> Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org Store a cookie during submission, and use that to implement completion-polling inside the ->uring_cmd_iopoll handler. This handler makes use of existing bio poll facility. Signed-off-by: Kanchan Joshi Signed-off-by: Anuj Gupta --- drivers/nvme/host/core.c | 1 + drivers/nvme/host/ioctl.c | 73 ++++++++++++++++++++++++++++++++--- drivers/nvme/host/multipath.c | 1 + drivers/nvme/host/nvme.h | 2 + 4 files changed, 72 insertions(+), 5 deletions(-) diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c index 2429b11eb9a8..77b6c2882afd 100644 --- a/drivers/nvme/host/core.c +++ b/drivers/nvme/host/core.c @@ -3976,6 +3976,7 @@ static const struct file_operations nvme_ns_chr_fops = { .unlocked_ioctl = nvme_ns_chr_ioctl, .compat_ioctl = compat_ptr_ioctl, .uring_cmd = nvme_ns_chr_uring_cmd, + .uring_cmd_iopoll = nvme_ns_chr_uring_cmd_iopoll, }; static int nvme_add_ns_cdev(struct nvme_ns *ns) diff --git a/drivers/nvme/host/ioctl.c b/drivers/nvme/host/ioctl.c index 27614bee7380..136f0fd25710 100644 --- a/drivers/nvme/host/ioctl.c +++ b/drivers/nvme/host/ioctl.c @@ -391,11 +391,19 @@ static void nvme_uring_cmd_end_io(struct request *req, blk_status_t err) struct nvme_uring_cmd_pdu *pdu = nvme_uring_cmd_pdu(ioucmd); /* extract bio before reusing the same field for request */ struct bio *bio = pdu->bio; + void *cookie = READ_ONCE(ioucmd->cookie); pdu->req = req; req->bio = bio; - /* this takes care of moving rest of completion-work to task context */ - io_uring_cmd_complete_in_task(ioucmd, nvme_uring_task_cb); + + /* + * For iopoll, complete it directly. + * Otherwise, move the completion to task work. + */ + if (cookie != NULL && blk_rq_is_poll(req)) + nvme_uring_task_cb(ioucmd); + else + io_uring_cmd_complete_in_task(ioucmd, nvme_uring_task_cb); } static int nvme_uring_cmd_io(struct nvme_ctrl *ctrl, struct nvme_ns *ns, @@ -445,7 +453,10 @@ static int nvme_uring_cmd_io(struct nvme_ctrl *ctrl, struct nvme_ns *ns, rq_flags = REQ_NOWAIT; blk_flags = BLK_MQ_REQ_NOWAIT; } + if (issue_flags & IO_URING_F_IOPOLL) + rq_flags |= REQ_POLLED; +retry: req = nvme_alloc_user_request(q, &c, nvme_to_user_ptr(d.addr), d.data_len, nvme_to_user_ptr(d.metadata), d.metadata_len, 0, &meta, d.timeout_ms ? @@ -456,6 +467,17 @@ static int nvme_uring_cmd_io(struct nvme_ctrl *ctrl, struct nvme_ns *ns, req->end_io = nvme_uring_cmd_end_io; req->end_io_data = ioucmd; + if (issue_flags & IO_URING_F_IOPOLL && rq_flags & REQ_POLLED) { + if (unlikely(!req->bio)) { + /* we can't poll this, so alloc regular req instead */ + blk_mq_free_request(req); + rq_flags &= ~REQ_POLLED; + goto retry; + } else { + WRITE_ONCE(ioucmd->cookie, req->bio); + req->bio->bi_opf |= REQ_POLLED; + } + } /* to free bio on completion, as req->bio will be null at that time */ pdu->bio = req->bio; pdu->meta = meta; @@ -559,9 +581,6 @@ long nvme_ns_chr_ioctl(struct file *file, unsigned int cmd, unsigned long arg) static int nvme_uring_cmd_checks(unsigned int issue_flags) { - /* IOPOLL not supported yet */ - if (issue_flags & IO_URING_F_IOPOLL) - return -EOPNOTSUPP; /* NVMe passthrough requires big SQE/CQE support */ if ((issue_flags & (IO_URING_F_SQE128|IO_URING_F_CQE32)) != @@ -604,6 +623,23 @@ int nvme_ns_chr_uring_cmd(struct io_uring_cmd *ioucmd, unsigned int issue_flags) return nvme_ns_uring_cmd(ns, ioucmd, issue_flags); } +int nvme_ns_chr_uring_cmd_iopoll(struct io_uring_cmd *ioucmd) +{ + struct bio *bio; + int ret; + struct nvme_ns *ns; + struct request_queue *q; + + rcu_read_lock(); + bio = READ_ONCE(ioucmd->cookie); + ns = container_of(file_inode(ioucmd->file)->i_cdev, + struct nvme_ns, cdev); + q = ns->queue; + if (test_bit(QUEUE_FLAG_POLL, &q->queue_flags) && bio && bio->bi_bdev) + ret = bio_poll(bio, 0, 0); + rcu_read_unlock(); + return ret; +} #ifdef CONFIG_NVME_MULTIPATH static int nvme_ns_head_ctrl_ioctl(struct nvme_ns *ns, unsigned int cmd, void __user *argp, struct nvme_ns_head *head, int srcu_idx) @@ -685,6 +721,29 @@ int nvme_ns_head_chr_uring_cmd(struct io_uring_cmd *ioucmd, srcu_read_unlock(&head->srcu, srcu_idx); return ret; } + +int nvme_ns_head_chr_uring_cmd_iopoll(struct io_uring_cmd *ioucmd) +{ + struct cdev *cdev = file_inode(ioucmd->file)->i_cdev; + struct nvme_ns_head *head = container_of(cdev, struct nvme_ns_head, cdev); + int srcu_idx = srcu_read_lock(&head->srcu); + struct nvme_ns *ns = nvme_find_path(head); + struct bio *bio; + int ret = 0; + struct request_queue *q; + + if (ns) { + rcu_read_lock(); + bio = READ_ONCE(ioucmd->private); + q = ns->queue; + if (test_bit(QUEUE_FLAG_POLL, &q->queue_flags) && bio + && bio->bi_bdev) + ret = bio_poll(bio, 0, 0); + rcu_read_unlock(); + } + srcu_read_unlock(&head->srcu, srcu_idx); + return ret; +} #endif /* CONFIG_NVME_MULTIPATH */ int nvme_dev_uring_cmd(struct io_uring_cmd *ioucmd, unsigned int issue_flags) @@ -692,6 +751,10 @@ int nvme_dev_uring_cmd(struct io_uring_cmd *ioucmd, unsigned int issue_flags) struct nvme_ctrl *ctrl = ioucmd->file->private_data; int ret; + /* IOPOLL not supported yet */ + if (issue_flags & IO_URING_F_IOPOLL) + return -EOPNOTSUPP; + ret = nvme_uring_cmd_checks(issue_flags); if (ret) return ret; diff --git a/drivers/nvme/host/multipath.c b/drivers/nvme/host/multipath.c index 6ef497c75a16..00f2f81e20fa 100644 --- a/drivers/nvme/host/multipath.c +++ b/drivers/nvme/host/multipath.c @@ -439,6 +439,7 @@ static const struct file_operations nvme_ns_head_chr_fops = { .unlocked_ioctl = nvme_ns_head_chr_ioctl, .compat_ioctl = compat_ptr_ioctl, .uring_cmd = nvme_ns_head_chr_uring_cmd, + .uring_cmd_iopoll = nvme_ns_head_chr_uring_cmd_iopoll, }; static int nvme_add_ns_head_cdev(struct nvme_ns_head *head) diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h index bdc0ff7ed9ab..3f2d3dda6e6c 100644 --- a/drivers/nvme/host/nvme.h +++ b/drivers/nvme/host/nvme.h @@ -821,6 +821,8 @@ long nvme_ns_head_chr_ioctl(struct file *file, unsigned int cmd, unsigned long arg); long nvme_dev_ioctl(struct file *file, unsigned int cmd, unsigned long arg); +int nvme_ns_chr_uring_cmd_iopoll(struct io_uring_cmd *ioucmd); +int nvme_ns_head_chr_uring_cmd_iopoll(struct io_uring_cmd *ioucmd); int nvme_ns_chr_uring_cmd(struct io_uring_cmd *ioucmd, unsigned int issue_flags); int nvme_ns_head_chr_uring_cmd(struct io_uring_cmd *ioucmd, -- 2.25.1