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Date: Tue, 3 May 2022 20:48:30 +0200 Message-Id: <20220503184831.78705-5-p.raghav@samsung.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220503184831.78705-1-p.raghav@samsung.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFtrBKsWRmVeSWpSXmKPExsWy7djPc7o6lYVJBntm8Vg0TfjLbDFn1TZG i9V3+9ksbh7YyWSxcvVRJot3redYLI7+f8tmcf7tYSaL+cueslvcmPCU0eLQ5GYmi6svD7A7 8HhMbH7H7rFz1l12j8tnSz02repk89i8pN5j980GNo/3+66yefRtWcXo8XmTXABnFJdNSmpO Zllqkb5dAlfG9zmL2QuehFYcWWHSwPjKvYuRk0NCwETi5uWvLF2MXBxCAisYJX5//s4M4Xxh lJixegNU5jOjxOEdm5lhWo4sesUOkVjOKNF1+hdUy0tGiYPTz7B2MXJwsAloSTR2soM0iAjI S3y5vRZsErNAI5PEhTPHwCYJC0RKTJg9kQnEZhFQlVg3ZSlYnFfAUuLercOMENvkJWZe+s4O MpNTwEpix3yoEkGJkzOfsIDYzEAlzVtng90gIfCFQ6LjwjlGkHoJAReJKUd4IMYIS7w6voUd wpaR+L9zPhOEXS3x9MZvqN4WRon+nevZIHqtJfrO5ICYzAKaEut36UOUO0ocaf7BClHBJ3Hj rSDEBXwSk7ZNZ4YI80p0tAlBVCtJ7Pz5BGqphMTlpjksECUeEq9XuUxgVJyF5JVZSF6ZhbB2 ASPzKkbx1NLi3PTUYuO81HK94sTc4tK8dL3k/NxNjMDEdfrf8a87GFe8+qh3iJGJg/EQowQH s5IIr/PSgiQh3pTEyqrUovz4otKc1OJDjNIcLErivMmZGxKFBNITS1KzU1MLUotgskwcnFIN TNYNn7MzTonESDx/tTDmlVsYj9jm5xdXTn9444jmT6/Eve6nYsRr/O5/lr/ssuSle023GC8f 42stTb/29WsV2/jn37YJ3fn/ebfy3vTjgu/WM64w1WQLzui3OPLec3vbR7HpV78zybFOiYz5 +t31jZ/UZwMfAeEUsVPTT7QavmI4wyHkVq04kytQ917R3B9bRNawVhoZV/ndPBbMK1w3fe6X 7QWXCsIcn//ef4uxcwPLD8PjmZGfTPlPPW45cOzQsj23LFK4jxxYufPmk4YdaerSFw/lHrv7 VOXUby5Wq6gzsuXc+1SMWz6u/nPli/0iuWt+H23lLszTKE2Ne7hrRerLXvH/30RstcM7HqlM fqjEUpyRaKjFXFScCAAkmxAtywMAAA== X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFlrBIsWRmVeSWpSXmKPExsVy+t/xu7ralYVJBk1v1C2aJvxltpizahuj xeq7/WwWNw/sZLJYufook8W71nMsFkf/v2WzOP/2MJPF/GVP2S1uTHjKaHFocjOTxdWXB9gd eDwmNr9j99g56y67x+WzpR6bVnWyeWxeUu+x+2YDm8f7fVfZPPq2rGL0+LxJLoAzSs+mKL+0 JFUhI7+4xFYp2tDCSM/Q0kLPyMRSz9DYPNbKyFRJ384mJTUnsyy1SN8uQS/j+5zF7AVPQiuO rDBpYHzl3sXIySEhYCJxZNEr9i5GLg4hgaWMEpPOzGaHSEhI3F7YxAhhC0v8udbFBlH0nFFi zb6LQAkODjYBLYnGTrB6EQFFiY0fQeq5OJgFepkkjvfvYAWpERYIl3i82g+khkVAVWLdlKXM IDavgKXEvVuHoebLS8y89J0dpJxTwEpix3ywEiGgkraJi9khygUlTs58wgJiMwOVN2+dzTyB UWAWktQsJKkFjEyrGEVSS4tz03OLDfWKE3OLS/PS9ZLzczcxAqNs27Gfm3cwznv1Ue8QIxMH 4yFGCQ5mJRFe56UFSUK8KYmVValF+fFFpTmpxYcYTYHOnsgsJZqcD4zzvJJ4QzMDU0MTM0sD U0szYyVxXs+CjkQhgfTEktTs1NSC1CKYPiYOTqkGpuQFGQtuhPyJdCrX2GwuuNS1/+vfw/st /Vsko7hmC4svahN7JZNXtHDBW36WpTP7Q/qbYr5mKtyZx5D1x7mcgZmNfer/h7z9O3SuWj0W yrsjdXnu/R833d9++dxg88ttSt2pyQJ/ysN+HmrsTr93+t2exYVpri4r5gVWJ83eHBfwOdYo Z/WSbct/lcmlKu1Mnsb/b75AvyKf+XEL9fB0+W1Frb0XVLP5dkyqqrA+OJv3JmM0k0bPTLNV TNnCE067fFdQ9EwOZli69MfP2b94pOsd8y/8ef/CcVbrV13xvzFPnv/cuqR+V2TvxAm6p6c3 SO+Jv/iljPvSx/1MWROrJT9lLNht73Z/dnaz1vezR5VYijMSDbWYi4oTAdVPblY7AwAA X-CMS-MailID: 20220503184915eucas1p2ae04772900c24ef0b23fd8bedead20ae X-Msg-Generator: CA Content-Type: text/plain; charset="utf-8" X-RootMTR: 20220503184915eucas1p2ae04772900c24ef0b23fd8bedead20ae X-EPHeader: CA CMS-TYPE: 201P X-CMS-RootMailID: 20220503184915eucas1p2ae04772900c24ef0b23fd8bedead20ae References: <20220503184831.78705-1-p.raghav@samsung.com> Precedence: bulk List-ID: X-Mailing-List: io-uring@vger.kernel.org From: Kanchan Joshi Introduce handler for fops->uring_cmd(), implementing async passthru on char device (/dev/ngX). The handler supports newly introduced operation NVME_URING_CMD_IO. This operates on a new structure nvme_uring_cmd, which is similiar to struct nvme_passthru_cmd64 but without the embedded 8b result field. This is not needed since uring-cmd allows to return additional result to user-space via big-CQE. Signed-off-by: Kanchan Joshi Signed-off-by: Anuj Gupta --- drivers/nvme/host/core.c | 1 + drivers/nvme/host/ioctl.c | 166 +++++++++++++++++++++++++++++++- drivers/nvme/host/multipath.c | 1 + drivers/nvme/host/nvme.h | 3 + include/uapi/linux/nvme_ioctl.h | 25 +++++ 5 files changed, 193 insertions(+), 3 deletions(-) diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c index e1846d04817f..682df98db341 100644 --- a/drivers/nvme/host/core.c +++ b/drivers/nvme/host/core.c @@ -3699,6 +3699,7 @@ static const struct file_operations nvme_ns_chr_fops = { .release = nvme_ns_chr_release, .unlocked_ioctl = nvme_ns_chr_ioctl, .compat_ioctl = compat_ptr_ioctl, + .uring_cmd = nvme_ns_chr_uring_cmd, }; 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 3531de8073a6..e428d692375a 100644 --- a/drivers/nvme/host/ioctl.c +++ b/drivers/nvme/host/ioctl.c @@ -26,6 +26,80 @@ static inline void *nvme_meta_from_bio(struct bio *bio) return bip ? bvec_virt(bip->bip_vec) : NULL; } +/* + * This overlays struct io_uring_cmd pdu. + * Expect build errors if this grows larger than that. + */ +struct nvme_uring_cmd_pdu { + union { + struct bio *bio; + struct request *req; + }; + void *meta; /* kernel-resident buffer */ + void __user *meta_buffer; + u32 meta_len; +} __packed; + +static inline struct nvme_uring_cmd_pdu *nvme_uring_cmd_pdu( + struct io_uring_cmd *ioucmd) +{ + return (struct nvme_uring_cmd_pdu *)&ioucmd->pdu; +} + +static void nvme_uring_task_cb(struct io_uring_cmd *ioucmd) +{ + struct nvme_uring_cmd_pdu *pdu = nvme_uring_cmd_pdu(ioucmd); + struct request *req = pdu->req; + struct bio *bio = req->bio; + bool write = req_op(req) == REQ_OP_DRV_OUT; + int status; + u64 result; + + if (nvme_req(req)->flags & NVME_REQ_CANCELLED) + status = -EINTR; + else + status = nvme_req(req)->status; + + result = le64_to_cpu(nvme_req(req)->result.u64); + blk_mq_free_request(req); + if (bio) + blk_rq_unmap_user(bio); + + if (pdu->meta && !status && !write) { + if (copy_to_user(pdu->meta_buffer, pdu->meta, pdu->meta_len)) + status = -EFAULT; + } + kfree(pdu->meta); + io_uring_cmd_done(ioucmd, status, result); +} + +static void nvme_end_async_pt(struct request *req, blk_status_t err) +{ + struct io_uring_cmd *ioucmd = req->end_io_data; + 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; + + 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); +} + +static void nvme_setup_uring_cmd_data(struct request *rq, + struct io_uring_cmd *ioucmd, void __user *meta_buffer, + u32 meta_len) +{ + struct nvme_uring_cmd_pdu *pdu = nvme_uring_cmd_pdu(ioucmd); + + /* to free bio on completion, as req->bio will be null at that time */ + pdu->bio = rq->bio; + pdu->meta = nvme_meta_from_bio(rq->bio); + pdu->meta_buffer = meta_buffer; + pdu->meta_len = meta_len; + rq->end_io_data = ioucmd; +} + static void *nvme_add_user_metadata(struct bio *bio, void __user *ubuf, unsigned len, u32 seed, bool write) { @@ -63,7 +137,8 @@ static void *nvme_add_user_metadata(struct bio *bio, void __user *ubuf, static struct request *nvme_alloc_user_request(struct request_queue *q, struct nvme_command *cmd, void __user *ubuffer, unsigned bufflen, void __user *meta_buffer, unsigned meta_len, - u32 meta_seed, unsigned timeout, bool vec) + u32 meta_seed, unsigned timeout, bool vec, unsigned int rq_flags, + blk_mq_req_flags_t blk_flags) { bool write = nvme_is_write(cmd); struct nvme_ns *ns = q->queuedata; @@ -73,7 +148,7 @@ static struct request *nvme_alloc_user_request(struct request_queue *q, void *meta = NULL; int ret; - req = blk_mq_alloc_request(q, nvme_req_op(cmd), 0); + req = blk_mq_alloc_request(q, nvme_req_op(cmd) | rq_flags, blk_flags); if (IS_ERR(req)) return req; nvme_init_request(req, cmd); @@ -156,7 +231,7 @@ static int nvme_submit_user_cmd(struct request_queue *q, struct request *req; req = nvme_alloc_user_request(q, cmd, ubuffer, bufflen, meta_buffer, - meta_len, meta_seed, timeout, vec); + meta_len, meta_seed, timeout, vec, 0, 0); if (IS_ERR(req)) return PTR_ERR(req); return nvme_execute_user_rq(req, meta_buffer, meta_len, result); @@ -333,6 +408,55 @@ static int nvme_user_cmd64(struct nvme_ctrl *ctrl, struct nvme_ns *ns, return status; } +static int nvme_uring_cmd_io(struct nvme_ctrl *ctrl, struct nvme_ns *ns, + struct io_uring_cmd *ioucmd) +{ + struct nvme_uring_cmd *cmd = + (struct nvme_uring_cmd *)ioucmd->cmd; + struct request_queue *q = ns ? ns->queue : ctrl->admin_q; + struct nvme_command c; + struct request *req; + unsigned int rq_flags = 0; + blk_mq_req_flags_t blk_flags = 0; + + if (!capable(CAP_SYS_ADMIN)) + return -EACCES; + if (cmd->flags) + return -EINVAL; + if (!nvme_validate_passthru_nsid(ctrl, ns, cmd->nsid)) + return -EINVAL; + + if (ioucmd->flags & IO_URING_F_NONBLOCK) { + rq_flags = REQ_NOWAIT; + blk_flags = BLK_MQ_REQ_NOWAIT; + } + memset(&c, 0, sizeof(c)); + c.common.opcode = cmd->opcode; + c.common.flags = cmd->flags; + c.common.nsid = cpu_to_le32(cmd->nsid); + c.common.cdw2[0] = cpu_to_le32(cmd->cdw2); + c.common.cdw2[1] = cpu_to_le32(cmd->cdw3); + c.common.cdw10 = cpu_to_le32(cmd->cdw10); + c.common.cdw11 = cpu_to_le32(cmd->cdw11); + c.common.cdw12 = cpu_to_le32(cmd->cdw12); + c.common.cdw13 = cpu_to_le32(cmd->cdw13); + c.common.cdw14 = cpu_to_le32(cmd->cdw14); + c.common.cdw15 = cpu_to_le32(cmd->cdw15); + + req = nvme_alloc_user_request(q, &c, nvme_to_user_ptr(cmd->addr), + cmd->data_len, nvme_to_user_ptr(cmd->metadata), + cmd->metadata_len, 0, cmd->timeout_ms ? + msecs_to_jiffies(cmd->timeout_ms) : 0, 0, rq_flags, + blk_flags); + if (IS_ERR(req)) + return PTR_ERR(req); + + nvme_setup_uring_cmd_data(req, ioucmd, nvme_to_user_ptr(cmd->metadata), + cmd->metadata_len); + blk_execute_rq_nowait(req, 0, nvme_end_async_pt); + return -EIOCBQUEUED; +} + static bool is_ctrl_ioctl(unsigned int cmd) { if (cmd == NVME_IOCTL_ADMIN_CMD || cmd == NVME_IOCTL_ADMIN64_CMD) @@ -424,6 +548,31 @@ long nvme_ns_chr_ioctl(struct file *file, unsigned int cmd, unsigned long arg) return __nvme_ioctl(ns, cmd, (void __user *)arg); } +static void nvme_ns_uring_cmd(struct nvme_ns *ns, struct io_uring_cmd *ioucmd) +{ + int ret; + + BUILD_BUG_ON(sizeof(struct nvme_uring_cmd_pdu) > sizeof(ioucmd->pdu)); + + switch (ioucmd->cmd_op) { + case NVME_URING_CMD_IO: + ret = nvme_uring_cmd_io(ns->ctrl, ns, ioucmd); + break; + default: + ret = -ENOTTY; + } + + if (ret != -EIOCBQUEUED) + io_uring_cmd_done(ioucmd, ret, 0); +} + +void nvme_ns_chr_uring_cmd(struct io_uring_cmd *ioucmd) +{ + struct nvme_ns *ns = container_of(file_inode(ioucmd->file)->i_cdev, + struct nvme_ns, cdev); + nvme_ns_uring_cmd(ns, ioucmd); +} + #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) @@ -490,6 +639,17 @@ long nvme_ns_head_chr_ioctl(struct file *file, unsigned int cmd, srcu_read_unlock(&head->srcu, srcu_idx); return ret; } +void nvme_ns_head_chr_uring_cmd(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); + + if (ns) + nvme_ns_uring_cmd(ns, ioucmd); + srcu_read_unlock(&head->srcu, srcu_idx); +} #endif /* CONFIG_NVME_MULTIPATH */ static int nvme_dev_user_cmd(struct nvme_ctrl *ctrl, void __user *argp) diff --git a/drivers/nvme/host/multipath.c b/drivers/nvme/host/multipath.c index d464fdf978fb..d3e2440d8abb 100644 --- a/drivers/nvme/host/multipath.c +++ b/drivers/nvme/host/multipath.c @@ -437,6 +437,7 @@ static const struct file_operations nvme_ns_head_chr_fops = { .release = nvme_ns_head_chr_release, .unlocked_ioctl = nvme_ns_head_chr_ioctl, .compat_ioctl = compat_ptr_ioctl, + .uring_cmd = nvme_ns_head_chr_uring_cmd, }; 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 a2b53ca63335..57c9adb97ce9 100644 --- a/drivers/nvme/host/nvme.h +++ b/drivers/nvme/host/nvme.h @@ -16,6 +16,7 @@ #include #include #include +#include #include @@ -782,6 +783,8 @@ 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); +void nvme_ns_chr_uring_cmd(struct io_uring_cmd *ioucmd); +void nvme_ns_head_chr_uring_cmd(struct io_uring_cmd *ioucmd); int nvme_getgeo(struct block_device *bdev, struct hd_geometry *geo); extern const struct attribute_group *nvme_ns_id_attr_groups[]; diff --git a/include/uapi/linux/nvme_ioctl.h b/include/uapi/linux/nvme_ioctl.h index b2e43185e3b5..04e458c649ab 100644 --- a/include/uapi/linux/nvme_ioctl.h +++ b/include/uapi/linux/nvme_ioctl.h @@ -70,6 +70,28 @@ struct nvme_passthru_cmd64 { __u64 result; }; +/* same as struct nvme_passthru_cmd64, minus the 8b result field */ +struct nvme_uring_cmd { + __u8 opcode; + __u8 flags; + __u16 rsvd1; + __u32 nsid; + __u32 cdw2; + __u32 cdw3; + __u64 metadata; + __u64 addr; + __u32 metadata_len; + __u32 data_len; + __u32 cdw10; + __u32 cdw11; + __u32 cdw12; + __u32 cdw13; + __u32 cdw14; + __u32 cdw15; + __u32 timeout_ms; + __u32 rsvd2; +}; + #define nvme_admin_cmd nvme_passthru_cmd #define NVME_IOCTL_ID _IO('N', 0x40) @@ -83,4 +105,7 @@ struct nvme_passthru_cmd64 { #define NVME_IOCTL_IO64_CMD _IOWR('N', 0x48, struct nvme_passthru_cmd64) #define NVME_IOCTL_IO64_CMD_VEC _IOWR('N', 0x49, struct nvme_passthru_cmd64) +/* io_uring async commands: */ +#define NVME_URING_CMD_IO _IOWR('N', 0x80, struct nvme_uring_cmd) + #endif /* _UAPI_LINUX_NVME_IOCTL_H */ -- 2.25.1