From patchwork Thu Feb 16 00:22:48 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: John Harrison X-Patchwork-Id: 13142334 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 DBEECC636CC for ; Thu, 16 Feb 2023 00:23:47 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 3368010E004; Thu, 16 Feb 2023 00:23:47 +0000 (UTC) Received: from mga17.intel.com (mga17.intel.com [192.55.52.151]) by gabe.freedesktop.org (Postfix) with ESMTPS id 3F9BE10E00D; Thu, 16 Feb 2023 00:23:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1676507026; x=1708043026; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=LcjKVTpoWBOuZ3g30E8RAn5BLgh5Z5qL91JvI7+YNlk=; b=ROYBAIhib23KmgDM7nvY/NCAW21yBWtC7rym5HXsoNN5jB64PbK/9/Di fP29n1PDI0agvleY12A2tFu/DwX94zkkwJMv+5ZafCz5XcEwAMUhgg5j9 8ClslynVq8D3aHjEim2sgpbKDXMzFyUJdPtmjXSmclffhpq4qkmqb5iiv KTqNvVHUGF2HF3TwkUVLxLhw8iKMLs6rWNBQdwPYSm3B1urHdmxq3D625 E+d41+c2KagZwUBUsqfvZtgo13BtWTau9siU1MXAQkuEO2sRQ2sr1uyqw KunI2byZoAqrJ9Ez/O3BHSbtfn2wazw8BKhyEzqgwXMCPFdk88oCzIcU6 A==; X-IronPort-AV: E=McAfee;i="6500,9779,10622"; a="311945702" X-IronPort-AV: E=Sophos;i="5.97,301,1669104000"; d="scan'208";a="311945702" Received: from orsmga005.jf.intel.com ([10.7.209.41]) by fmsmga107.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 15 Feb 2023 16:23:45 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6500,9779,10622"; a="843928662" X-IronPort-AV: E=Sophos;i="5.97,301,1669104000"; d="scan'208";a="843928662" Received: from relo-linux-5.jf.intel.com ([10.165.21.152]) by orsmga005.jf.intel.com with ESMTP; 15 Feb 2023 16:23:32 -0800 From: John.C.Harrison@Intel.com To: Intel-GFX@Lists.FreeDesktop.Org Date: Wed, 15 Feb 2023 16:22:48 -0800 Message-Id: <20230216002248.1851966-3-John.C.Harrison@Intel.com> X-Mailer: git-send-email 2.39.1 In-Reply-To: <20230216002248.1851966-1-John.C.Harrison@Intel.com> References: <20230216002248.1851966-1-John.C.Harrison@Intel.com> MIME-Version: 1.0 Organization: Intel Corporation (UK) Ltd. - Co. Reg. #1134945 - Pipers Way, Swindon SN3 1RJ Subject: [Intel-gfx] [PATCH v2 2/2] drm/i915: Don't use BAR mappings for ring buffers with LLC X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: intel-gfx@lists.freedesktop.org, Chris Wilson , DRI-Devel@Lists.FreeDesktop.Org, Rodrigo Vivi , stable@vger.kernel.org Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" From: Daniele Ceraolo Spurio Direction from hardware is that ring buffers should never be mapped via the BAR on systems with LLC. There are too many caching pitfalls due to the way BAR accesses are routed. So it is safest to just not use it. Signed-off-by: John Harrison Fixes: 9d80841ea4c9 ("drm/i915: Allow ringbuffers to be bound anywhere") Cc: Chris Wilson Cc: Joonas Lahtinen Cc: Jani Nikula Cc: Rodrigo Vivi Cc: Tvrtko Ursulin Cc: intel-gfx@lists.freedesktop.org Cc: # v4.9+ --- drivers/gpu/drm/i915/gt/intel_ring.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/i915/gt/intel_ring.c b/drivers/gpu/drm/i915/gt/intel_ring.c index fb1d2595392ed..8675ec8ead353 100644 --- a/drivers/gpu/drm/i915/gt/intel_ring.c +++ b/drivers/gpu/drm/i915/gt/intel_ring.c @@ -53,7 +53,7 @@ int intel_ring_pin(struct intel_ring *ring, struct i915_gem_ww_ctx *ww) if (unlikely(ret)) goto err_unpin; - if (i915_vma_is_map_and_fenceable(vma)) { + if (i915_vma_is_map_and_fenceable(vma) && !HAS_LLC(vma->vm->i915)) { addr = (void __force *)i915_vma_pin_iomap(vma); } else { int type = i915_coherent_map_type(vma->vm->i915, vma->obj, false); @@ -98,7 +98,7 @@ void intel_ring_unpin(struct intel_ring *ring) return; i915_vma_unset_ggtt_write(vma); - if (i915_vma_is_map_and_fenceable(vma)) + if (i915_vma_is_map_and_fenceable(vma) && !HAS_LLC(vma->vm->i915)) { i915_vma_unpin_iomap(vma); else i915_gem_object_unpin_map(vma->obj);