On 5/13/19 7:39 AM, Michael Neuling wrote:
> commit 243e25112d06 ("powerpc/xive: Native exploitation of the XIVE
> interrupt controller") added an option to turn off Linux native XIVE
> usage via the xive=off kernel command line option.
>
> This documents this option.
>
> Signed-off-by: Michael Neuling <mi...@neuling.org>
Reviewed-by: Cédric Le Goater <c...@kaod.org>
But,
We should fix the behavior because xive=off does not work on pseries.
This is not handled correctly in prom when CAS negotiates with the
hypervisor which interrupt mode is to be used.
I haven't tried this option on PowerNV.
Cheers,
C.
> ---
> Documentation/admin-guide/kernel-parameters.txt | 9 +++++++++
> 1 file changed, 9 insertions(+)
>
> diff --git a/Documentation/admin-guide/kernel-parameters.txt
> b/Documentation/admin-guide/kernel-parameters.txt
> index c45a19d654..ee410d0ef4 100644
> --- a/Documentation/admin-guide/kernel-parameters.txt
> +++ b/Documentation/admin-guide/kernel-parameters.txt
> @@ -5177,6 +5177,15 @@
> Format:
>
> <irq>,<irq_mask>,<io>,<full_duplex>,<do_sound>,<lockup_hack>[,<irq2>[,<irq3>[,<irq4>]]]
>
> + xive= [PPC]
> + By default on POWER9 and above, the kernel will
> + natively use the XIVE interrupt controller. This option
> + allows the fallback firmware mode to be used:
> +
> + off Fallback to firmware control of XIVE interrupt
> + controller on both pseries and powernv
> + platforms. Only useful on POWER9 and above.
> +
> xhci-hcd.quirks [USB,KNL]
> A hex value specifying bitmask with supplemental xhci
> host controller quirks. Meaning of each bit can be
>
