[Intel-gfx] [PATCH v3] drm/i915/dg2: Add performance workaround 18019455067

[Lionel Landwerlin]

Ping?

On 11/07/2022 14:30, Lionel Landwerlin wrote:
> Ping?
>
> On 30/06/2022 11:35, Lionel Landwerlin wrote:
>> The recommended number of stackIDs for Ray Tracing subsystem is 512
>> rather than 2048 (default HW programming).
>>
>> v2: Move the programming to dg2_ctx_gt_tuning_init() (Lucas)
>>
>> v3: Move programming to general_render_compute_wa_init() (Matt)
>>
>> Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin at intel.com>
>> ---
>>   drivers/gpu/drm/i915/gt/intel_gt_regs.h     | 4 ++++
>>   drivers/gpu/drm/i915/gt/intel_workarounds.c | 9 +++++++++
>>   2 files changed, 13 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/i915/gt/intel_gt_regs.h 
>> b/drivers/gpu/drm/i915/gt/intel_gt_regs.h
>> index 07ef111947b8c..12fc87b957425 100644
>> --- a/drivers/gpu/drm/i915/gt/intel_gt_regs.h
>> +++ b/drivers/gpu/drm/i915/gt/intel_gt_regs.h
>> @@ -1112,6 +1112,10 @@
>>   #define   GEN12_PUSH_CONST_DEREF_HOLD_DIS    REG_BIT(8)
>>     #define RT_CTRL                    _MMIO(0xe530)
>> +#define   RT_CTRL_NUMBER_OF_STACKIDS_MASK    REG_GENMASK(6, 5)
>> +#define   NUMBER_OF_STACKIDS_512        2
>> +#define   NUMBER_OF_STACKIDS_1024        1
>> +#define   NUMBER_OF_STACKIDS_2048        0
>>   #define   DIS_NULL_QUERY            REG_BIT(10)
>>     #define EU_PERF_CNTL1                _MMIO(0xe558)
>> diff --git a/drivers/gpu/drm/i915/gt/intel_workarounds.c 
>> b/drivers/gpu/drm/i915/gt/intel_workarounds.c
>> index 3213c593a55f4..ea674e456cd76 100644
>> --- a/drivers/gpu/drm/i915/gt/intel_workarounds.c
>> +++ b/drivers/gpu/drm/i915/gt/intel_workarounds.c
>> @@ -2737,6 +2737,15 @@ general_render_compute_wa_init(struct 
>> intel_engine_cs *engine, struct i915_wa_li
>>           wa_write_or(wal, VDBX_MOD_CTRL, FORCE_MISS_FTLB);
>>           wa_write_or(wal, VEBX_MOD_CTRL, FORCE_MISS_FTLB);
>>       }
>> +
>> +    if (IS_DG2(i915)) {
>> +        /* Performance tuning for Ray-tracing */
>> +        wa_write_clr_set(wal,
>> +                 RT_CTRL,
>> +                 RT_CTRL_NUMBER_OF_STACKIDS_MASK,
>> + REG_FIELD_PREP(RT_CTRL_NUMBER_OF_STACKIDS_MASK,
>> +                        NUMBER_OF_STACKIDS_512));
>> +    }
>>   }
>>     static void
>
>