*/
#include <linux/ptrace.h> /* for force_successful_syscall_return */
#include <linux/nvme_ioctl.h>
+#include <linux/io_uring.h>
#include "nvme.h"
/*
return ERR_PTR(ret);
}
-static int nvme_submit_user_cmd(struct request_queue *q,
+static int nvme_finish_user_metadata(struct request *req, void __user *ubuf,
+ void *meta, unsigned len, int ret)
+{
+ if (!ret && req_op(req) == REQ_OP_DRV_IN &&
+ copy_to_user(ubuf, meta, len))
+ ret = -EFAULT;
+ kfree(meta);
+ return ret;
+}
+
+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, u64 *result, unsigned timeout, bool vec)
+ u32 meta_seed, void **metap, 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;
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 PTR_ERR(req);
+ return req;
nvme_init_request(req, cmd);
if (timeout)
goto out_unmap;
}
req->cmd_flags |= REQ_INTEGRITY;
+ *metap = meta;
}
}
+ return req;
+
+out_unmap:
+ if (bio)
+ blk_rq_unmap_user(bio);
+out:
+ blk_mq_free_request(req);
+ return ERR_PTR(ret);
+}
+
+static int nvme_submit_user_cmd(struct request_queue *q,
+ struct nvme_command *cmd, void __user *ubuffer,
+ unsigned bufflen, void __user *meta_buffer, unsigned meta_len,
+ u32 meta_seed, u64 *result, unsigned timeout, bool vec)
+{
+ struct request *req;
+ void *meta = NULL;
+ struct bio *bio;
+ int ret;
+
+ req = nvme_alloc_user_request(q, cmd, ubuffer, bufflen, meta_buffer,
+ meta_len, meta_seed, &meta, timeout, vec, 0, 0);
+ if (IS_ERR(req))
+ return PTR_ERR(req);
+
+ bio = req->bio;
+
ret = nvme_execute_passthru_rq(req);
+
if (result)
*result = le64_to_cpu(nvme_req(req)->result.u64);
- if (meta && !ret && !write) {
- if (copy_to_user(meta_buffer, meta, meta_len))
- ret = -EFAULT;
- }
- kfree(meta);
- out_unmap:
+ if (meta)
+ ret = nvme_finish_user_metadata(req, meta_buffer, meta,
+ meta_len, ret);
if (bio)
blk_rq_unmap_user(bio);
- out:
blk_mq_free_request(req);
return ret;
}
-
static int nvme_submit_io(struct nvme_ns *ns, struct nvme_user_io __user *uio)
{
struct nvme_user_io io;
return status;
}
+struct nvme_uring_data {
+ __u64 metadata;
+ __u64 addr;
+ __u32 data_len;
+ __u32 metadata_len;
+ __u32 timeout_ms;
+};
+
+/*
+ * 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;
+};
+
+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;
+ 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);
+
+ if (pdu->meta)
+ status = nvme_finish_user_metadata(req, pdu->meta_buffer,
+ pdu->meta, pdu->meta_len, status);
+ if (bio)
+ blk_rq_unmap_user(bio);
+ blk_mq_free_request(req);
+
+ io_uring_cmd_done(ioucmd, status, result);
+}
+
+static void nvme_uring_cmd_end_io(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 int nvme_uring_cmd_io(struct nvme_ctrl *ctrl, struct nvme_ns *ns,
+ struct io_uring_cmd *ioucmd, unsigned int issue_flags, bool vec)
+{
+ struct nvme_uring_cmd_pdu *pdu = nvme_uring_cmd_pdu(ioucmd);
+ const struct nvme_uring_cmd *cmd = ioucmd->cmd;
+ struct request_queue *q = ns ? ns->queue : ctrl->admin_q;
+ struct nvme_uring_data d;
+ struct nvme_command c;
+ struct request *req;
+ unsigned int rq_flags = 0;
+ blk_mq_req_flags_t blk_flags = 0;
+ void *meta = NULL;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EACCES;
+
+ c.common.opcode = READ_ONCE(cmd->opcode);
+ c.common.flags = READ_ONCE(cmd->flags);
+ if (c.common.flags)
+ return -EINVAL;
+
+ c.common.command_id = 0;
+ c.common.nsid = cpu_to_le32(cmd->nsid);
+ if (!nvme_validate_passthru_nsid(ctrl, ns, le32_to_cpu(c.common.nsid)))
+ return -EINVAL;
+
+ c.common.cdw2[0] = cpu_to_le32(READ_ONCE(cmd->cdw2));
+ c.common.cdw2[1] = cpu_to_le32(READ_ONCE(cmd->cdw3));
+ c.common.metadata = 0;
+ c.common.dptr.prp1 = c.common.dptr.prp2 = 0;
+ c.common.cdw10 = cpu_to_le32(READ_ONCE(cmd->cdw10));
+ c.common.cdw11 = cpu_to_le32(READ_ONCE(cmd->cdw11));
+ c.common.cdw12 = cpu_to_le32(READ_ONCE(cmd->cdw12));
+ c.common.cdw13 = cpu_to_le32(READ_ONCE(cmd->cdw13));
+ c.common.cdw14 = cpu_to_le32(READ_ONCE(cmd->cdw14));
+ c.common.cdw15 = cpu_to_le32(READ_ONCE(cmd->cdw15));
+
+ d.metadata = READ_ONCE(cmd->metadata);
+ d.addr = READ_ONCE(cmd->addr);
+ d.data_len = READ_ONCE(cmd->data_len);
+ d.metadata_len = READ_ONCE(cmd->metadata_len);
+ d.timeout_ms = READ_ONCE(cmd->timeout_ms);
+
+ if (issue_flags & IO_URING_F_NONBLOCK) {
+ rq_flags = REQ_NOWAIT;
+ blk_flags = BLK_MQ_REQ_NOWAIT;
+ }
+
+ 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 ?
+ msecs_to_jiffies(d.timeout_ms) : 0, vec, rq_flags,
+ blk_flags);
+ if (IS_ERR(req))
+ return PTR_ERR(req);
+ req->end_io_data = ioucmd;
+
+ /* to free bio on completion, as req->bio will be null at that time */
+ pdu->bio = req->bio;
+ pdu->meta = meta;
+ pdu->meta_buffer = nvme_to_user_ptr(d.metadata);
+ pdu->meta_len = d.metadata_len;
+
+ blk_execute_rq_nowait(req, 0, nvme_uring_cmd_end_io);
+ return -EIOCBQUEUED;
+}
+
static bool is_ctrl_ioctl(unsigned int cmd)
{
if (cmd == NVME_IOCTL_ADMIN_CMD || cmd == NVME_IOCTL_ADMIN64_CMD)
return __nvme_ioctl(ns, cmd, (void __user *)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)) !=
+ (IO_URING_F_SQE128|IO_URING_F_CQE32))
+ return -EOPNOTSUPP;
+ return 0;
+}
+
+static int nvme_ns_uring_cmd(struct nvme_ns *ns, struct io_uring_cmd *ioucmd,
+ unsigned int issue_flags)
+{
+ struct nvme_ctrl *ctrl = ns->ctrl;
+ int ret;
+
+ BUILD_BUG_ON(sizeof(struct nvme_uring_cmd_pdu) > sizeof(ioucmd->pdu));
+
+ ret = nvme_uring_cmd_checks(issue_flags);
+ if (ret)
+ return ret;
+
+ switch (ioucmd->cmd_op) {
+ case NVME_URING_CMD_IO:
+ ret = nvme_uring_cmd_io(ctrl, ns, ioucmd, issue_flags, false);
+ break;
+ case NVME_URING_CMD_IO_VEC:
+ ret = nvme_uring_cmd_io(ctrl, ns, ioucmd, issue_flags, true);
+ break;
+ default:
+ ret = -ENOTTY;
+ }
+
+ return ret;
+}
+
+int nvme_ns_chr_uring_cmd(struct io_uring_cmd *ioucmd, unsigned int issue_flags)
+{
+ struct nvme_ns *ns = container_of(file_inode(ioucmd->file)->i_cdev,
+ struct nvme_ns, cdev);
+
+ return nvme_ns_uring_cmd(ns, ioucmd, issue_flags);
+}
+
#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)
srcu_read_unlock(&head->srcu, srcu_idx);
return ret;
}
+
+int nvme_ns_head_chr_uring_cmd(struct io_uring_cmd *ioucmd,
+ unsigned int issue_flags)
+{
+ 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);
+ int ret = -EINVAL;
+
+ if (ns)
+ ret = nvme_ns_uring_cmd(ns, ioucmd, issue_flags);
+ 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)
+{
+ struct nvme_ctrl *ctrl = ioucmd->file->private_data;
+ int ret;
+
+ ret = nvme_uring_cmd_checks(issue_flags);
+ if (ret)
+ return ret;
+
+ switch (ioucmd->cmd_op) {
+ case NVME_URING_CMD_ADMIN:
+ ret = nvme_uring_cmd_io(ctrl, NULL, ioucmd, issue_flags, false);
+ break;
+ case NVME_URING_CMD_ADMIN_VEC:
+ ret = nvme_uring_cmd_io(ctrl, NULL, ioucmd, issue_flags, true);
+ break;
+ default:
+ ret = -ENOTTY;
+ }
+
+ return ret;
+}
+
static int nvme_dev_user_cmd(struct nvme_ctrl *ctrl, void __user *argp)
{
struct nvme_ns *ns;
git.samba.org / sfrench / cifs-2.6.git / blobdiff