Re: [PATCH v2 2/4] drm/i915/gen9: Add WaDisableCtxRestoreArbitration workaround

[Mika Kuoppala <mika.kuoppala@linux.intel.com>]

Arun Siluvery <arun.siluvery@linux.intel.com> writes:

> In Indirect and Per context w/a batch buffer,
> +WaDisableCtxRestoreArbitration
>
> v2: SKL revision id was used for BXT, copy paste error found during
> internal review (Bob Beckett).
>
> Cc: Robert Beckett <robert.beckett@intel.com>
> Cc: Imre Deak <imre.deak@intel.com>
> Signed-off-by: Arun Siluvery <arun.siluvery@linux.intel.com>

Reviewed-by: Mika Kuoppala <mika.kuoppala@intel.com>

> ---
>  drivers/gpu/drm/i915/intel_lrc.c | 13 +++++++++++--
>  1 file changed, 11 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
> index 1e88b3b..e84fc52 100644
> --- a/drivers/gpu/drm/i915/intel_lrc.c
> +++ b/drivers/gpu/drm/i915/intel_lrc.c
> @@ -1274,10 +1274,13 @@ static int gen9_init_indirectctx_bb(struct intel_engine_cs *ring,
>  				    uint32_t *const batch,
>  				    uint32_t *offset)
>  {
> +	struct drm_device *dev = ring->dev;
>  	uint32_t index = wa_ctx_start(wa_ctx, *offset, CACHELINE_DWORDS);
>  
> -	/* FIXME: Replace me with WA */
> -	wa_ctx_emit(batch, MI_NOOP);
> +	/* WaDisableCtxRestoreArbitration:skl,bxt */
> +	if ((IS_SKYLAKE(dev) && (INTEL_REVID(dev) <= SKL_REVID_D0)) ||
> +	    (IS_BROXTON(dev) && (INTEL_REVID(dev) == BXT_REVID_A0)))
> +		wa_ctx_emit(batch, MI_ARB_ON_OFF | MI_ARB_DISABLE);
>  
>  	/* Pad to end of cacheline */
>  	while (index % CACHELINE_DWORDS)
> @@ -1291,8 +1294,14 @@ static int gen9_init_perctx_bb(struct intel_engine_cs *ring,
>  			       uint32_t *const batch,
>  			       uint32_t *offset)
>  {
> +	struct drm_device *dev = ring->dev;
>  	uint32_t index = wa_ctx_start(wa_ctx, *offset, CACHELINE_DWORDS);
>  
> +	/* WaDisableCtxRestoreArbitration:skl,bxt */
> +	if ((IS_SKYLAKE(dev) && (INTEL_REVID(dev) <= SKL_REVID_D0)) ||
> +	    (IS_BROXTON(dev) && (INTEL_REVID(dev) == BXT_REVID_A0)))
> +		wa_ctx_emit(batch, MI_ARB_ON_OFF | MI_ARB_ENABLE);
> +
>  	wa_ctx_emit(batch, MI_BATCH_BUFFER_END);
>  
>  	return wa_ctx_end(wa_ctx, *offset = index, 1);
> -- 
> 1.9.1
>
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