[PATCH 65/65] powerpc/mm/radix: Cputable update for radix
Michael Ellerman
mpe at ellerman.id.au
Fri Apr 1 17:25:08 AEDT 2016
On Sun, 2016-03-27 at 13:54 +0530, Aneesh Kumar K.V wrote:
> This patch move the existing p9 hash to a different PVR and add
> radix feature with p9 PVR. That implies we will not be able to
> runtime select P9 hash. With P9 Radix we need to do
>
> * set UPRT = 0 in cpu setup
> * set different TLB set count
>
> We ideally want to use ibm,pa-features to enable disable radix. But
> we have already done setup cpu by the time we reach pa-features check.
>
> So for now use this hack.
>
> Not-Signed-off-by: Aneesh Kumar K.V <aneesh.kumar at linux.vnet.ibm.com>
...
> diff --git a/arch/powerpc/kernel/cpu_setup_power.S b/arch/powerpc/kernel/cpu_setup_power.S
> index 584e119fa8b0..e9b76c651bd1 100644
> --- a/arch/powerpc/kernel/cpu_setup_power.S
> +++ b/arch/powerpc/kernel/cpu_setup_power.S
> @@ -117,6 +117,41 @@ _GLOBAL(__restore_cpu_power9)
> mtlr r11
> blr
>
> +_GLOBAL(__setup_cpu_power9_uprt)
> + mflr r11
> + bl __init_FSCR
> + bl __init_hvmode_206
> + mtlr r11
> + beqlr
> + li r0,0
> + mtspr SPRN_LPID,r0
> + mfspr r3,SPRN_LPCR
> + ori r3, r3, LPCR_PECEDH
> + oris r3,r3,(LPCR_UPRT >> 16)
> + bl __init_LPCR
I don't see why we *have* to initialise this here.
ie. could we do it later in early_init_mmu() or similar ?
cheers
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