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NVMe: Add NVME_IOCTL_SUBMIT_IO

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Allow userspace to submit synchronous I/O like the SCSI sg interface does.

Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com>
This commit is contained in:
Matthew Wilcox 2011-02-01 16:13:29 -05:00
parent 7fc3cdabba
commit a53295b699
2 changed files with 61 additions and 0 deletions
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43
drivers/block/nvme.c
View file

@ -780,6 +780,47 @@ static int nvme_get_range_type(struct nvme_ns *ns, unsigned long addr)
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 @@ static int nvme_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd,
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;
}

18
include/linux/nvme.h
View file

@ -340,8 +340,26 @@ struct nvme_completion {
__le16 status; /* did the command fail, and if so, why? */
};
struct nvme_user_io {
__u8 opcode;
__u8 flags;
__u16 control;
__u32 nsid;
__u64 metadata;
__u64 addr;
__u64 slba;
__u16 nblocks;
__u16 block_shift;
__u32 dsmgmt;
__u32 reftag;
__u16 apptag;
__u16 appmask;
__u32 result;
};
#define NVME_IOCTL_IDENTIFY_NS _IOW('N', 0x40, struct nvme_id_ns)
#define NVME_IOCTL_IDENTIFY_CTRL _IOW('N', 0x41, struct nvme_id_ctrl)
#define NVME_IOCTL_GET_RANGE_TYPE _IOW('N', 0x42, struct nvme_lba_range_type)
#define NVME_IOCTL_SUBMIT_IO _IOWR('N', 0x43, struct nvme_rw_command)
#endif /* _LINUX_NVME_H */