[Intel-gfx] [PATCH v3] drm/i915/icl: Gen11 render context size

[Oscar Mateo]

On 01/11/2018 11:40 AM, Rodrigo Vivi wrote:
> On Thu, Jan 11, 2018 at 06:23:20PM +0000, Oscar Mateo wrote:
>> From: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
>>
>> Gen11 removes the Resource Streamer, which frees up a big chunk of
>> the context image. BSpec indicates 12538 DWORDs (13 pages), plus
>> one page for PPHWSP.
>>
>> Please notice that, when looking at the BSpec context image table,
>> the right filter has to be applied (e.g. "IcelakeLP") as some rows
>> are excluded for specific GENs. Also, some rows apply per-subslice
>> (for the calculation above, we have supposed 8 subslices which is
>> the maximum SKU we expect).
>>
>> v2: Rebase.
>> v3: Use the right size as per the BSpec.
>>
>> BSpec: 18907
>>
>> Acked-by: Ben Widawsky <benjamin.widawsky at intel.com>
>> Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
>> Signed-off-by: Oscar Mateo <oscar.mateo at intel.com>
>> ---
>>   drivers/gpu/drm/i915/intel_engine_cs.c | 3 +++
>>   1 file changed, 3 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/i915/intel_engine_cs.c b/drivers/gpu/drm/i915/intel_engine_cs.c
>> index e88b2fd..79b7d36 100644
>> --- a/drivers/gpu/drm/i915/intel_engine_cs.c
>> +++ b/drivers/gpu/drm/i915/intel_engine_cs.c
>> @@ -41,6 +41,7 @@
>>   #define GEN8_LR_CONTEXT_RENDER_SIZE	(20 * PAGE_SIZE)
>>   #define GEN9_LR_CONTEXT_RENDER_SIZE	(22 * PAGE_SIZE)
>>   #define GEN10_LR_CONTEXT_RENDER_SIZE	(18 * PAGE_SIZE)
>> +#define GEN11_LR_CONTEXT_RENDER_SIZE	(14 * PAGE_SIZE)
>>   
>>   #define GEN8_LR_CONTEXT_OTHER_SIZE	( 2 * PAGE_SIZE)
>>   
>> @@ -181,6 +182,8 @@ struct engine_info {
>>   		switch (INTEL_GEN(dev_priv)) {
>>   		default:
>>   			MISSING_CASE(INTEL_GEN(dev_priv));
> I believe this default is getting danger as we decrease the size here.
> I believe the safest one for missing case is the largest one whatever that is.

That's a very sensible idea. I don't know to put the default case in the 
middle of the other ones or change the numerical order, so I'll create a 
new define for the default case...
>> +		case 11:
>> +			return GEN11_LR_CONTEXT_RENDER_SIZE;
>>   		case 10:
>>   			return GEN10_LR_CONTEXT_RENDER_SIZE;
>>   		case 9:
>> -- 
>> 1.9.1
>>
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