[Skiboot] [PATCH v3] core/init: Add ibm, processor-storage-keys property to CPU DT node

[Oliver O'Halloran]

On Mon, Nov 18, 2019 at 1:38 PM Michael Ellerman <mpe at ellerman.id.au> wrote:
>
> From: Thiago Jung Bauermann <bauerman at linux.vnet.ibm.com>
>
> LoPAPR says:
>
>     “ibm,processor-storage-keys”
>
>     property name indicating the number of virtual storage keys supported
>     by the processor described by this node.
>
>     prop-encoded-array: Consists of two cells encoded as with encode-int.
>     The first cell represents the number of virtual storage keys supported
>     for data accesses while the second cell represents the number of
>     virtual storage keys supported for instruction accesses. The cell value
>     of zero indicates that no storage keys are supported for the access
>     type.
>
> pHyp provides the property above but there's a bug in P8 firmware
> where the second cell is zero even though POWER8 supports instruction
> access keys. This bug will be fixed for P9.
>
> While this is a PAPR property, it's useful to have it in powernv as
> well so that Linux has a uniform way of checking for the feature
> regardless of the platform it's running on.
>
> Tested on QEMU POWER8 powernv model, Mambo P9 and POWER8 Firenze
> machine.
>
> Signed-off-by: Thiago Jung Bauermann <bauerman at linux.vnet.ibm.com>
> [mpe: Rebase, add comment explaining why we hard code 32]
> Signed-off-by: Michael Ellerman <mpe at ellerman.id.au>

Merged as 528b72fa4de9931b715f6cbc6380b54ada1cadc4