From patchwork Wed Jun 8 20:51:30 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bob Beckett X-Patchwork-Id: 12874652 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 15279C43334 for ; Wed, 8 Jun 2022 20:53:11 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 820E511A098; Wed, 8 Jun 2022 20:53:01 +0000 (UTC) Received: from madras.collabora.co.uk (madras.collabora.co.uk [46.235.227.172]) by gabe.freedesktop.org (Postfix) with ESMTPS id 3AA5E11A08C; Wed, 8 Jun 2022 20:52:58 +0000 (UTC) Received: from hermes-devbox.fritz.box (82-71-8-225.dsl.in-addr.zen.co.uk [82.71.8.225]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) (Authenticated sender: bbeckett) by madras.collabora.co.uk (Postfix) with ESMTPSA id C81FD660180B; Wed, 8 Jun 2022 21:52:56 +0100 (BST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=collabora.com; s=mail; t=1654721577; bh=dOKJizqx/fHYXj8qk/D8e8eM9at0JQtCb+3CVcme0hQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=YNiGyGCme9YHOMcIev2ZMFL/JVDvALB45ep/pOYrZ6Wn5EduYIRB54eA8O2OH3xOX U6ph0YvuKSHWF0FiPjyw14hYeflkzYWIJuyBtiESibJEKMZsloAi9pVQjgDs4Okt+U 5IYjlMY2DCvTz2O3o4Q7CW3syoipUBPPSTzGf4K93jZtDi1q5xSm1znRS1k2uDeido 7h1G/jKbEqTXTiiaBCVB+ukzNKCE2Nyp30vF8wErs9P+P3jJXmFw0PauGgJkFhws/S 5uDTxJsNqGwUiGgU0c+74S9IXIkR8BntmOkc2NGiup0QN4AyKfoARQl2dcsUoMpq8n W8RLaLsqdsMNQ== From: Robert Beckett To: dri-devel@lists.freedesktop.org, intel-gfx@lists.freedesktop.org, Jani Nikula , Joonas Lahtinen , Rodrigo Vivi , Tvrtko Ursulin , David Airlie , Daniel Vetter Subject: [PATCH v2 7/8] drm/i915/ttm: trust snooping when gen 6+ when deciding default cache_level Date: Wed, 8 Jun 2022 20:51:30 +0000 Message-Id: <20220608205132.438596-8-bob.beckett@collabora.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220608205132.438596-1-bob.beckett@collabora.com> References: <20220608205132.438596-1-bob.beckett@collabora.com> MIME-Version: 1.0 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Robert Beckett , =?utf-8?q?Thomas_Hellstr?= =?utf-8?q?=C3=B6m?= , kernel@collabora.com, Matthew Auld , linux-kernel@vger.kernel.org Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" By default i915_ttm_cache_level() decides I915_CACHE_LLC if HAS_SNOOP. this is divergent from existing backends code which only considers HAS_LLC. Testing shows that trusting snooping on gen5- is unreliable, so limit to gen6+ Signed-off-by: Robert Beckett --- drivers/gpu/drm/i915/gem/i915_gem_ttm_move.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/i915/gem/i915_gem_ttm_move.c b/drivers/gpu/drm/i915/gem/i915_gem_ttm_move.c index 4c1de0b4a10f..e6cce35edb65 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_ttm_move.c +++ b/drivers/gpu/drm/i915/gem/i915_gem_ttm_move.c @@ -46,7 +46,9 @@ static enum i915_cache_level i915_ttm_cache_level(struct drm_i915_private *i915, struct ttm_resource *res, struct ttm_tt *ttm) { - return ((HAS_LLC(i915) || HAS_SNOOP(i915)) && + bool can_snoop = HAS_SNOOP(i915) && (GRAPHICS_VER(i915) > 5); + + return ((HAS_LLC(i915) || can_snoop) && !i915_ttm_gtt_binds_lmem(res) && ttm->caching == ttm_cached) ? I915_CACHE_LLC : I915_CACHE_NONE;