linux-kernel - Re: [Intel-gfx] [PATCH 2/6] drm/i915/gt: Invalidate TLB of the OA unit at TLB invalidations

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Date:   Wed, 15 Jun 2022 10:03:15 -0700
From:   Umesh Nerlige Ramappa <umesh.nerlige.ramappa@...el.com>
To:     Mauro Carvalho Chehab <mchehab@...nel.org>
Cc:     David Airlie <airlied@...ux.ie>, dri-devel@...ts.freedesktop.org,
        Chris Wilson <chris.p.wilson@...el.com>,
        Matthew Auld <matthew.auld@...el.com>,
        Dave Airlie <airlied@...hat.com>,
        Thomas Hellström 
        <thomas.hellstrom@...ux.intel.com>,
        intel-gfx@...ts.freedesktop.org,
        Lucas De Marchi <lucas.demarchi@...el.com>,
        Thomas Hellstrom <thomas.hellstrom@...el.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        mauro.chehab@...ux.intel.com,
        Michał Winiarski <michal.winiarski@...el.com>,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [Intel-gfx] [PATCH 2/6] drm/i915/gt: Invalidate TLB of the OA
 unit at TLB invalidations

On Wed, Jun 15, 2022 at 04:27:36PM +0100, Mauro Carvalho Chehab wrote:
>From: Chris Wilson <chris.p.wilson@...el.com>
>
>On gen12 HW, ensure that the TLB of the OA unit is also invalidated
>as just invalidating the TLB of an engine is not enough.
>
>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>
>Cc: stable@...r.kernel.org
>Acked-by: Thomas Hellström <thomas.hellstrom@...ux.intel.com>
>Signed-off-by: Mauro Carvalho Chehab <mchehab@...nel.org>
>---
>
>See [PATCH 0/6] at: https://lore.kernel.org/all/cover.1655306128.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 d5ed6a6ac67c..61b7ec5118f9 100644
>--- a/drivers/gpu/drm/i915/gt/intel_gt.c
>+++ b/drivers/gpu/drm/i915/gt/intel_gt.c
>@@ -10,6 +10,7 @@
> #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"
>@@ -1259,6 +1260,15 @@ 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);
>+

This patch can be dropped since this is being done in i915/i915_perf.c 
-> gen12_oa_disable and is synchronized with OA use cases.

Regards,
Umesh


> 	for_each_engine_masked(engine, gt, awake, tmp) {
> 		struct reg_and_bit rb;
>
>-- 
>2.36.1
>