linux-kernel - Re: [PATCH v2 03/21] drm/i915/gt: Invalidate TLB of the OA unit at TLB invalidations

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Date:   Mon, 18 Jul 2022 14:24:02 +0100
From:   Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>
To:     Mauro Carvalho Chehab <mchehab@...nel.org>
Cc:     Chris Wilson <chris.p.wilson@...el.com>,
        Andi Shyti <andi.shyti@...ux.intel.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Daniele Ceraolo Spurio <daniele.ceraolospurio@...el.com>,
        Dave Airlie <airlied@...hat.com>,
        David Airlie <airlied@...ux.ie>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Lucas De Marchi <lucas.demarchi@...el.com>,
        Matt Roper <matthew.d.roper@...el.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        dri-devel@...ts.freedesktop.org, intel-gfx@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Fei Yang <fei.yang@...el.com>,
        Thomas Hellström 
        <thomas.hellstrom@...ux.intel.com>
Subject: Re: [PATCH v2 03/21] drm/i915/gt: Invalidate TLB of the OA unit at
 TLB invalidations


On 14/07/2022 13:06, Mauro Carvalho Chehab wrote:
> From: Chris Wilson <chris.p.wilson@...el.com>
> 
> Ensure that the TLB of the OA unit is also invalidated
> on gen12 HW, as just invalidating the TLB of an engine is not
> enough.
> 
> Cc: stable@...r.kernel.org
> Fixes: 7938d61591d3 ("drm/i915: Flush TLBs before releasing backing store")
> Signed-off-by: Chris Wilson <chris.p.wilson@...el.com>
> Cc: Fei Yang <fei.yang@...el.com>
> Cc: Andi Shyti <andi.shyti@...ux.intel.com>
> Acked-by: Thomas Hellström <thomas.hellstrom@...ux.intel.com>
> Signed-off-by: Mauro Carvalho Chehab <mchehab@...nel.org>

Acked-by: Tvrtko Ursulin <tvrtko.ursulin@...el.com>

Regards,

Tvrtko

> ---
> 
> To avoid mailbombing on a large number of people, only mailing lists were C/C on the cover.
> See [PATCH v2 00/21] at: https://lore.kernel.org/all/cover.1657800199.git.mchehab@kernel.org/
> 
>   drivers/gpu/drm/i915/gt/intel_gt.c | 10 ++++++++++
>   1 file changed, 10 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/gt/intel_gt.c b/drivers/gpu/drm/i915/gt/intel_gt.c
> index c4d43da84d8e..1d84418e8676 100644
> --- a/drivers/gpu/drm/i915/gt/intel_gt.c
> +++ b/drivers/gpu/drm/i915/gt/intel_gt.c
> @@ -11,6 +11,7 @@
>   #include "pxp/intel_pxp.h"
>   
>   #include "i915_drv.h"
> +#include "i915_perf_oa_regs.h"
>   #include "intel_context.h"
>   #include "intel_engine_pm.h"
>   #include "intel_engine_regs.h"
> @@ -969,6 +970,15 @@ void intel_gt_invalidate_tlbs(struct intel_gt *gt)
>   		awake |= engine->mask;
>   	}
>   
> +	/* Wa_2207587034:tgl,dg1,rkl,adl-s,adl-p */
> +	if (awake &&
> +	    (IS_TIGERLAKE(i915) ||
> +	     IS_DG1(i915) ||
> +	     IS_ROCKETLAKE(i915) ||
> +	     IS_ALDERLAKE_S(i915) ||
> +	     IS_ALDERLAKE_P(i915)))
> +		intel_uncore_write_fw(uncore, GEN12_OA_TLB_INV_CR, 1);
> +
>   	spin_unlock_irq(&uncore->lock);
>   
>   	for_each_engine_masked(engine, gt, awake, tmp) {