On Mon, 2014-11-24 at 15:07 +0100, Laurent Dufour wrote:
> On pseries system (LPAR) xmon failed to enter when running in LE mode, system
> is hunging. Inititating xmon will lead to such an output on the console:
>
> SysRq : Entering xmon
> cpu 0x15: Vector: 0 at [c0000003f39ffb10]
> pc: c00000000007ed7c: sysrq_handle_xmon+0x5c/0x70
> lr: c00000000007ed7c: sysrq_handle_xmon+0x5c/0x70
> sp: c0000003f39ffc70
> msr: 8000000000009033
> current = 0xc0000003fafa7180
> paca = 0xc000000007d75e80 softe: 0 irq_happened: 0x01
> pid = 14617, comm = bash
> Bad kernel stack pointer fafb4b0 at eca7cc4
> cpu 0x15: Vector: 300 (Data Access) at [c000000007f07d40]
> pc: 000000000eca7cc4
> lr: 000000000eca7c44
> sp: fafb4b0
> msr: 8000000000001000
> dar: 10000000
> dsisr: 42000000
> current = 0xc0000003fafa7180
> paca = 0xc000000007d75e80 softe: 0 irq_happened: 0x01
> pid = 14617, comm = bash
> cpu 0x15: Exception 300 (Data Access) in xmon, returning to main loop
> xmon: WARNING: bad recursive fault on cpu 0x15
>
> The root cause is that xmon is calling RTAS to turn off the surveillance
> when entering xmon, and RTAS is requiring big endian parameters.
>
> This patch is byte swapping the RTAS arguments when running in LE mode.
>
> Signed-off-by: Laurent Dufour <lduf...@linux.vnet.ibm.com>
> ---
> arch/powerpc/xmon/xmon.c | 6 +++---
> 1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/arch/powerpc/xmon/xmon.c b/arch/powerpc/xmon/xmon.c
> index b988b5addf86..c8efbb37d6e0 100644
> --- a/arch/powerpc/xmon/xmon.c
> +++ b/arch/powerpc/xmon/xmon.c
> @@ -293,10 +293,10 @@ static inline void disable_surveillance(void)
> args.token = rtas_token("set-indicator");
> if (args.token == RTAS_UNKNOWN_SERVICE)
> return;
I just noticed we're not handling the token correctly here. It is be32 also.
cheers
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