NVMe: Add NVME_IOCTL_SUBMIT_IO
Allow userspace to submit synchronous I/O like the SCSI sg interface does.
Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com>
diff --git a/drivers/block/nvme.c b/drivers/block/nvme.c
index f44d6cd..40fb2e1 100644
--- a/drivers/block/nvme.c
+++ b/drivers/block/nvme.c
@@ -780,6 +780,47 @@
return nvme_submit_user_admin_command(ns->dev, addr, 4096, &c);
}
+static int nvme_submit_io(struct nvme_ns *ns, struct nvme_user_io __user *uio)
+{
+ struct nvme_dev *dev = ns->dev;
+ struct nvme_queue *nvmeq;
+ struct nvme_user_io io;
+ struct nvme_command c;
+ unsigned length;
+ u32 result;
+ int nents, status;
+ struct scatterlist *sg;
+
+ if (copy_from_user(&io, uio, sizeof(io)))
+ return -EFAULT;
+ length = io.nblocks << io.block_shift;
+ nents = nvme_map_user_pages(dev, io.opcode & 1, io.addr, length, &sg);
+ if (nents < 0)
+ return nents;
+
+ memset(&c, 0, sizeof(c));
+ c.rw.opcode = io.opcode;
+ c.rw.flags = io.flags;
+ c.rw.nsid = cpu_to_le32(io.nsid);
+ c.rw.slba = cpu_to_le64(io.slba);
+ c.rw.length = cpu_to_le16(io.nblocks - 1);
+ c.rw.control = cpu_to_le16(io.control);
+ c.rw.dsmgmt = cpu_to_le16(io.dsmgmt);
+ c.rw.reftag = cpu_to_le32(io.reftag); /* XXX: endian? */
+ c.rw.apptag = cpu_to_le16(io.apptag);
+ c.rw.appmask = cpu_to_le16(io.appmask);
+ /* XXX: metadata */
+ nvme_setup_prps(&c.common, sg, length);
+
+ nvmeq = get_nvmeq(ns);
+ status = nvme_submit_sync_cmd(nvmeq, &c, &result);
+ put_nvmeq(nvmeq);
+
+ nvme_unmap_user_pages(dev, io.opcode & 1, io.addr, length, sg, nents);
+ put_user(result, &uio->result);
+ return status;
+}
+
static int nvme_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd,
unsigned long arg)
{
@@ -792,6 +833,8 @@
return nvme_identify(ns, arg, 1);
case NVME_IOCTL_GET_RANGE_TYPE:
return nvme_get_range_type(ns, arg);
+ case NVME_IOCTL_SUBMIT_IO:
+ return nvme_submit_io(ns, (void __user *)arg);
default:
return -ENOTTY;
}