Re: [Qemu-devel] [kvm-unit-tests RFC 05/15] arm/arm64: GICv3: add cpu count

[Auger Eric]

Hi Andre, Drew,

On 06/12/2016 10:32, Andre Przywara wrote:
> Hi,
> 
> On 06/12/16 09:29, Andrew Jones wrote:
>> On Mon, Dec 05, 2016 at 10:46:36PM +0100, Eric Auger wrote:
>>> Add a new cpu_count field in gicv3_data indicating the
>>> number of redistributors. This will be useful for enumeration
>>> of their resources such as LPI pending tables.
>>
>> I'm fine with the additional state, but just curious, will it
>> ever be possible for gicv3.cpu_count != nr_cpus?
> 
> If not you are in trouble, so that should in fact be one test.
> 
> Which brings me to my comment ...
> 
>>>
>>> Signed-off-by: Eric Auger <address@hidden>
>>> ---
>>>  lib/arm/asm/gic-v3.h | 1 +
>>>  lib/arm/gic-v3.c     | 2 ++
>>>  2 files changed, 3 insertions(+)
>>>
>>> diff --git a/lib/arm/asm/gic-v3.h b/lib/arm/asm/gic-v3.h
>>> index ed330af..039b7c2 100644
>>> --- a/lib/arm/asm/gic-v3.h
>>> +++ b/lib/arm/asm/gic-v3.h
>>> @@ -58,6 +58,7 @@ struct gicv3_data {
>>>     void *dist_base;
>>>     void *redist_base[NR_CPUS];
>>>     unsigned int irq_nr;
>>> +   unsigned int cpu_count;
> 
> Should that be called "nr_redists" or the like?
> Since this is what it counts in the code below.
> Later we can then compare this with nr_cpus to check for a match.

I fully agree with you suggestion.

Thanks

Eric
> 
> Cheers,
> Andre.
> 
>>>  };
>>>  extern struct gicv3_data gicv3_data;
>>>  
>>> diff --git a/lib/arm/gic-v3.c b/lib/arm/gic-v3.c
>>> index 6246221..9921f4d 100644
>>> --- a/lib/arm/gic-v3.c
>>> +++ b/lib/arm/gic-v3.c
>>> @@ -12,12 +12,14 @@ void gicv3_set_redist_base(size_t stride)
>>>     void *ptr = gicv3_data.redist_base[0];
>>>     u64 typer;
>>>  
>>> +   gicv3_data.cpu_count = 0;
>>>     do {
>>>             typer = gicv3_read_typer(ptr + GICR_TYPER);
>>>             if ((typer >> 32) == aff) {
>>>                     gicv3_redist_base() = ptr;
>>>                     return;
>>>             }
>>> +           gicv3_data.cpu_count++;
>>>             ptr += stride; /* skip RD_base, SGI_base, etc. */
>>>     } while (!(typer & GICR_TYPER_LAST));
>>>  
>>> -- 
>>> 2.5.5
>>>
>>>
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