[Intel-gfx] [PATCH dii-client 1/9] drm/i915/mtl: Fix bcs default context

[Matt Roper]

On Wed, Jan 11, 2023 at 03:55:23PM -0800, Radhakrishna Sripada wrote:
> From: Lucas De Marchi <lucas.demarchi at intel.com>
> 
> Commit 0d0e7d1eea9e ("drm/i915/mtl: Define engine context layouts")
> added the engine context for Meteor Lake. In a second revision of the
> patch it was believed the xcs offsets were wrong due to a tagging
> issue in the spec. The first version was actually correct, as shown
> by the intel_lrc_live_selftests/live_lrc_layout test:
> 
> 	i915: Running gt_lrc
> 	i915: Running intel_lrc_live_selftests/live_lrc_layout
> 	bcs0: LRI command mismatch at dword 1, expected 1108101d found 11081019
> 	[drm:drm_helper_probe_single_connector_modes [drm_kms_helper]] [CONNECTOR:236:DP-1] disconnected
> 	bcs0: HW register image:
> 	[0000] 00000000 1108101d 00022244 ffff0008 00022034 00000088 00022030 00000088
> 	...
> 	bcs0: SW register image:
> 	[0000] 00000000 11081019 00022244 00090009 00022034 00000000 00022030 00000000
> 
> The difference in the 2 additional dwords (0x1d vs 0x19) are the offsets
>  0x120 / 0x124 that are indeed part of the context image.
> 
> Bspec: 45585
> 
> Fixes: 0d0e7d1eea9e ("drm/i915/mtl: Define engine context layouts")
> Signed-off-by: Lucas De Marchi <lucas.demarchi at intel.com>
> Signed-off-by: Radhakrishna Sripada <radhakrishna.sripada at intel.com>

Reviewed-by: Matt Roper <matthew.d.roper at intel.com>

I'll poke the bspec people about getting the platform information fixed
for this so that we don't run into confusion here again.


Matt

> ---
>  drivers/gpu/drm/i915/gt/intel_lrc.c | 37 +----------------------------
>  1 file changed, 1 insertion(+), 36 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/gt/intel_lrc.c b/drivers/gpu/drm/i915/gt/intel_lrc.c
> index 7771a19008c6..bbeeb6dde7ae 100644
> --- a/drivers/gpu/drm/i915/gt/intel_lrc.c
> +++ b/drivers/gpu/drm/i915/gt/intel_lrc.c
> @@ -288,39 +288,6 @@ static const u8 dg2_xcs_offsets[] = {
>  	END
>  };
>  
> -static const u8 mtl_xcs_offsets[] = {
> -	NOP(1),
> -	LRI(13, POSTED),
> -	REG16(0x244),
> -	REG(0x034),
> -	REG(0x030),
> -	REG(0x038),
> -	REG(0x03c),
> -	REG(0x168),
> -	REG(0x140),
> -	REG(0x110),
> -	REG(0x1c0),
> -	REG(0x1c4),
> -	REG(0x1c8),
> -	REG(0x180),
> -	REG16(0x2b4),
> -	NOP(4),
> -
> -	NOP(1),
> -	LRI(9, POSTED),
> -	REG16(0x3a8),
> -	REG16(0x28c),
> -	REG16(0x288),
> -	REG16(0x284),
> -	REG16(0x280),
> -	REG16(0x27c),
> -	REG16(0x278),
> -	REG16(0x274),
> -	REG16(0x270),
> -
> -	END
> -};
> -
>  static const u8 gen8_rcs_offsets[] = {
>  	NOP(1),
>  	LRI(14, POSTED),
> @@ -739,9 +706,7 @@ static const u8 *reg_offsets(const struct intel_engine_cs *engine)
>  		else
>  			return gen8_rcs_offsets;
>  	} else {
> -		if (GRAPHICS_VER_FULL(engine->i915) >= IP_VER(12, 70))
> -			return mtl_xcs_offsets;
> -		else if (GRAPHICS_VER_FULL(engine->i915) >= IP_VER(12, 55))
> +		if (GRAPHICS_VER_FULL(engine->i915) >= IP_VER(12, 55))
>  			return dg2_xcs_offsets;
>  		else if (GRAPHICS_VER(engine->i915) >= 12)
>  			return gen12_xcs_offsets;
> -- 
> 2.34.1
> 

-- 
Matt Roper
Graphics Software Engineer
Linux GPU Platform Enablement
Intel Corporation