[PATCH 2/2] drm/amdkfd: Decode bit fields in 'cik_ih_ring_entry' directly

[Edward O'Callaghan]

Excellent point Christian, it did occur to me that endianness could be a
problem so will definitely fix this one up as Tom suggested.

Kind Regards,
Edward.

On 09/27/2016 11:02 PM, StDenis, Tom wrote:
> Better would be to add them to a bitmask header and then use
> REG_GET_FIELD() so it's nice and clean looking.
> 
> 
> Tom
> 
> 
> 
> ------------------------------------------------------------------------
> *From:* amd-gfx <amd-gfx-bounces at lists.freedesktop.org> on behalf of
> Christian König <deathsimple at vodafone.de>
> *Sent:* Tuesday, September 27, 2016 08:52
> *To:* Edward O'Callaghan; amd-gfx at lists.freedesktop.org
> *Subject:* Re: [PATCH 2/2] drm/amdkfd: Decode bit fields in
> 'cik_ih_ring_entry' directly
>  
> NAK, don't use bitfields to decode hardware values. They aren't portable.
> 
> Regards,
> Christian.
> 
> Am 27.09.2016 um 14:47 schrieb Edward O'Callaghan:
>> Signed-off-by: Edward O'Callaghan <funfunctor at folklore1984.net>
>> ---
>>   drivers/gpu/drm/amd/amdkfd/cik_event_interrupt.c | 15 +++++----------
>>   drivers/gpu/drm/amd/amdkfd/cik_int.h             | 20 ++++++++++++++++----
>>   2 files changed, 21 insertions(+), 14 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/amd/amdkfd/cik_event_interrupt.c b/drivers/gpu/drm/amd/amdkfd/cik_event_interrupt.c
>> index 211fc48..1c47b9e 100644
>> --- a/drivers/gpu/drm/amd/amdkfd/cik_event_interrupt.c
>> +++ b/drivers/gpu/drm/amd/amdkfd/cik_event_interrupt.c
>> @@ -27,14 +27,12 @@
>>   static bool cik_event_interrupt_isr(struct kfd_dev *dev,
>>                                        const uint32_t *ih_ring_entry)
>>   {
>> -     unsigned int pasid;
>>        const struct cik_ih_ring_entry *ihre =
>>                        (const struct cik_ih_ring_entry *)ih_ring_entry;
>>   
>> -     pasid = (ihre->ring_id & 0xffff0000) >> 16;
>>   
>>        /* Do not process in ISR, just request it to be forwarded to WQ. */
>> -     return (pasid != 0) &&
>> +     return (ihre->pasid != 0) &&
>>                (ihre->source_id == CIK_INTSRC_CP_END_OF_PIPE ||
>>                ihre->source_id == CIK_INTSRC_SQ_INTERRUPT_MSG ||
>>                ihre->source_id == CIK_INTSRC_CP_BAD_OPCODE);
>> @@ -43,21 +41,18 @@ static bool cik_event_interrupt_isr(struct kfd_dev *dev,
>>   static void cik_event_interrupt_wq(struct kfd_dev *dev,
>>                                        const uint32_t *ih_ring_entry)
>>   {
>> -     unsigned int pasid;
>>        const struct cik_ih_ring_entry *ihre =
>>                        (const struct cik_ih_ring_entry *)ih_ring_entry;
>>   
>> -     pasid = (ihre->ring_id & 0xffff0000) >> 16;
>> -
>> -     if (pasid == 0)
>> +     if (ihre->pasid == 0)
>>                return;
>>   
>>        if (ihre->source_id == CIK_INTSRC_CP_END_OF_PIPE)
>> -             kfd_signal_event_interrupt(pasid, 0, 0);
>> +             kfd_signal_event_interrupt(ihre->pasid, 0, 0);
>>        else if (ihre->source_id == CIK_INTSRC_SQ_INTERRUPT_MSG)
>> -             kfd_signal_event_interrupt(pasid, ihre->data & 0xFF, 8);
>> +             kfd_signal_event_interrupt(ihre->pasid, ihre->data & 0xFF, 8);
>>        else if (ihre->source_id == CIK_INTSRC_CP_BAD_OPCODE)
>> -             kfd_signal_hw_exception_event(pasid);
>> +             kfd_signal_hw_exception_event(ihre->pasid);
>>   }
>>   
>>   const struct kfd_event_interrupt_class event_interrupt_class_cik = {
>> diff --git a/drivers/gpu/drm/amd/amdkfd/cik_int.h b/drivers/gpu/drm/amd/amdkfd/cik_int.h
>> index 79a16d2..27d1ede 100644
>> --- a/drivers/gpu/drm/amd/amdkfd/cik_int.h
>> +++ b/drivers/gpu/drm/amd/amdkfd/cik_int.h
>> @@ -26,10 +26,22 @@
>>   #include <linux/types.h>
>>   
>>   struct cik_ih_ring_entry {
>> -     uint32_t source_id;
>> -     uint32_t data;
>> -     uint32_t ring_id;
>> -     uint32_t reserved;
>> +     uint32_t source_id:8;
>> +     uint32_t reserved1:8;
>> +     uint32_t reserved2:16;
>> +
>> +     uint32_t data:28;
>> +     uint32_t reserved3:4;
>> +
>> +     /* pipeid, meid and unused3 are officially called RINGID,
>> +      * but for our purposes, they always decode into pipe and ME. */
>> +     uint32_t pipeid:2;
>> +     uint32_t meid:2;
>> +     uint32_t reserved4:4;
>> +     uint32_t vmid:8;
>> +     uint32_t pasid:16;
>> +
>> +     uint32_t reserved5;
>>   };
>>   
>>   #define CIK_INTSRC_DEQUEUE_COMPLETE 0xC6
> 
> 
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