linux-kernel - Re: [PATCH v5 13/16] powerpc/mm/32s: Use BATs for STRICT_KERNEL

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Date:   Sun, 16 Jun 2019 10:20:29 +0200
From:   christophe leroy <christophe.leroy@....fr>
To:     Andreas Schwab <schwab@...ux-m68k.org>
Cc:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>, j.neuschaefer@....net,
        linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH v5 13/16] powerpc/mm/32s: Use BATs for STRICT_KERNEL_RWX

Le 15/06/2019 à 13:23, Andreas Schwab a écrit :
> This breaks suspend (or resume) on the iBook G4.  no_console_suspend
> doesn't give any clues, the display just stays dark.
> 

After a quick look at the suspend functions, I have the feeling that 
those functions only store and restore BATs 0 to 3.

Could you build your kernel with CONFIG_PPC_PTDUMP and see in file 
/sys/kernel/debug/powerpc/segment_registers how many IBATs registers are 
used.
If any of registers IBATs 4 to 7 are used, could you adjust 
CONFIG_ETEXT_SHIFT so that only IBATs 0 to 3 be used, and check if 
suspend/resume works when IBATs 4 to 7 are not used ?

Thanks
Christophe

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