The driver was still using an old definition of Identify Controller
which only came to light once we started using the 'number of namespaces'
field properly.
Reported-by: NNisheeth Bhat <nisheeth.bhat@intel.com>
Reported-by: NKhosrow Panah <Khosrow.Panah@idt.com>
Signed-off-by: NMatthew Wilcox <matthew.r.wilcox@intel.com>

The doorbell stride allows devices to spread out their doorbells instead
of packing them tightly.  This feature was added as part of ECN 003.

This patch also enables support for more than 512 queues :-)
Signed-off-by: NMatthew Wilcox <matthew.r.wilcox@intel.com>

Remove the special-purpose IDENTIFY, GET_RANGE_TYPE, DOWNLOAD_FIRMWARE
and ACTIVATE_FIRMWARE commands.  Replace them with a generic ADMIN_CMD
ioctl that can submit any admin command.

Add a new ID ioctl that returns the namespace ID of the queried device.
It corresponds to the SCSI Idlun ioctl.
Signed-off-by: NMatthew Wilcox <matthew.r.wilcox@intel.com>

THe device reports (in its capability register) how long it will take
to initialise.  If that time elapses before the ready bit becomes set,
conclude the device is broken and refuse to initialise it.  Log a nice
error message so the user knows why we did nothing.
Signed-off-by: NMatthew Wilcox <matthew.r.wilcox@intel.com>

The arbitration field was extended by one bit, shifting the shutdown
notification bits by one.  Also, the SQ/CQ entry size was made
configurable for future extensions.
Reported-by: NPaul Luse <paul.e.luse@intel.com>
Signed-off-by: NMatthew Wilcox <matthew.r.wilcox@intel.com>

The read and write commands don't define a 'result', so there's no need
to copy it back to userspace.

Remove the ability of the ioctl to submit commands to a different
namespace; it's just asking for trouble, and the use case I have in mind
will be addressed througha  different ioctl in the future.  That removes
the need for both the block_shift and nsid arguments.

Check that the opcode is one of 'read' or 'write'.  Future opcodes may
be added in the future, but we will need a different structure definition
for them.

The nblocks field is redefined to be 0-based.  This allows the user to
request the full 65536 blocks.

Don't byteswap the reftag, apptag and appmask.  Martin Petersen tells
me these are calculated in big-endian and are transmitted to the device
in big-endian.
Signed-off-by: NMatthew Wilcox <matthew.r.wilcox@intel.com>

NVME_IOCTL_SUBMIT_IO has a struct nvme_user_io, not a struct nvme_rw_command
as a parameter, and NVME_IOCTL_DOWNLOAD_FW is a Write, not a Read.
Reported-by: NArnd Bergmann <arnd@arndb.de>
Signed-off-by: NMatthew Wilcox <matthew.r.wilcox@intel.com>

The head can never overrun the tail since we won't allocate enough command
IDs to let that happen.  The status codes are in sync with the spec.
Signed-off-by: NMatthew Wilcox <matthew.r.wilcox@intel.com>

Signed-off-by: NKrzysztof Wierzbicki <krzysztof.wierzbicki@intel.com>
Signed-off-by: NMatthew Wilcox <willy@linux.intel.com>
Signed-off-by: NMatthew Wilcox <matthew.r.wilcox@intel.com>

Add two reserved registers in the middle of the BAR to match the 1.0
spec plus ECN 0002.

Also rename IMC and ISC to INTMC and INTSC to conform with the spec.
We still don't need to use them :-)
Signed-off-by: NMatthew Wilcox <matthew.r.wilcox@intel.com>

Signed-off-by: NMatthew Wilcox <matthew.r.wilcox@intel.com>

Signed-off-by: NMatthew Wilcox <matthew.r.wilcox@intel.com>

Allow userspace to submit synchronous I/O like the SCSI sg interface does.
Signed-off-by: NMatthew Wilcox <matthew.r.wilcox@intel.com>

Add prp1, prp2 and the metadata prp to the common command, since the
fields are generally used this way.
Signed-off-by: NMatthew Wilcox <matthew.r.wilcox@intel.com>

This driver is for devices that follow the NVM Express standard
Signed-off-by: NMatthew Wilcox <matthew.r.wilcox@intel.com>