[PATCH v6 02/18] nvmet/debugfs: Export controller CIU and CIRN via debugfs

[Daniel Wagner]

On Mon, Oct 19, 2026 at 12:01:06PM -0700, Mohamed Khalfella wrote:
> On Mon 2026-10-19 14:01:13 +0200, Daniel Wagner wrote:
> > On 2026-09-20 11:28 -0700, Mohamed Khalfella wrote:
> > > Export ctrl->ciu and ctrl->cirn as debugfs files under controller
> > > debugfs directory.
> > 
> > Could you add the 'why' part to the commit message?
> 
> target# grep . /sys/kernel/debug/nvmet/mysubsystem/ctrl1/{ciu,cirn}
> /sys/kernel/debug/nvmet/mysubsystem/ctrl1/ciu:57
> /sys/kernel/debug/nvmet/mysubsystem/ctrl1/cirn:42541d24813bb536
> target#
> 
> host# grep . /sys/class/nvme/nvme0/{cntlid,cirn,ciu}
> /sys/class/nvme/nvme0/cntlid:1
> /sys/class/nvme/nvme0/cirn:42541d24813bb536
> /sys/class/nvme/nvme0/ciu:57
> host# nvme admin-passthru \
>   --opcode 0x38 \
>   --cdw10=$(( 0x1 | 0x57<<16 )) \
>   --cdw12=$(( 0x42541d24813bb536 & 0xffffffff )) \
>   --cdw13=$(( ( 0x42541d24813bb536 >> 32 ) & 0xffffffff )) \
>   /dev/nvme1
> Admin Command Vendor Specific is Success and result: 0x00000000
> host#

In the meantime, nvme-cli learned to dump those values as well. I'm not
sure if it's worth adding these just for this use case.