Re: [PATCH v3 8/8] hvc: add an M3000 firmware console backend

[Greg KH]

On Mon, Oct 12, 2026 at 08:48:09PM +0200, Magnus Lindholm wrote:
> Provide hvc0 through the M3000 Open Firmware pseudo-console, validating
> the firmware model and console endpoints before registering it. Keep
> firmware buffers in locked kernel mappings and serialize their use in
> atomic console contexts through the existing SPARC p1275 interface.
> 
> Poll input while the TTY is open and synchronize close with timer
> rearming. Return zero on no progress so HVC retries buffered TTY output
> but drops stalled console chunks instead of spinning indefinitely.
> A firmware call that does not return remains unbounded.
> 
> Signed-off-by: Magnus Lindholm <linmag7@xxxxxxxxx>
> ---
>  MAINTAINERS                 |   6 ++
>  drivers/tty/hvc/Kconfig     |  10 ++
>  drivers/tty/hvc/Makefile    |   1 +
>  drivers/tty/hvc/hvc_m3000.c | 202 ++++++++++++++++++++++++++++++++++++
>  4 files changed, 219 insertions(+)
>  create mode 100644 drivers/tty/hvc/hvc_m3000.c

I'm guessing this will go through the sparc tree, so:

Reviewed-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

thanks,

greg k-h