From mboxrd@z Thu Jan 1 00:00:00 1970 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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 708CBC433EF for ; Tue, 5 Oct 2021 07:54:03 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id 264AC61350 for ; Tue, 5 Oct 2021 07:54:03 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 264AC61350 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.intel.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 3E2ED6EB40; Tue, 5 Oct 2021 07:54:00 +0000 (UTC) Received: from mga17.intel.com (mga17.intel.com [192.55.52.151]) by gabe.freedesktop.org (Postfix) with ESMTPS id 55C906EB3E; Tue, 5 Oct 2021 07:53:58 +0000 (UTC) X-IronPort-AV: E=McAfee;i="6200,9189,10127"; a="206496047" X-IronPort-AV: E=Sophos;i="5.85,348,1624345200"; d="scan'208";a="206496047" Received: from orsmga008.jf.intel.com ([10.7.209.65]) by fmsmga107.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 05 Oct 2021 00:53:57 -0700 X-IronPort-AV: E=Sophos;i="5.85,348,1624345200"; d="scan'208";a="487924881" Received: from tbarret1-mobl.ger.corp.intel.com (HELO [10.213.238.194]) ([10.213.238.194]) by orsmga008-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 05 Oct 2021 00:53:56 -0700 To: =?UTF-8?Q?Christian_K=c3=b6nig?= , linaro-mm-sig@lists.linaro.org, dri-devel@lists.freedesktop.org, linux-media@vger.kernel.org, intel-gfx@lists.freedesktop.org Cc: daniel@ffwll.ch References: <20211001100610.2899-1-christian.koenig@amd.com> <20211001100610.2899-25-christian.koenig@amd.com> From: Tvrtko Ursulin Organization: Intel Corporation UK Plc Message-ID: <80bb132f-0e40-68a1-d034-2d4b17d321ad@linux.intel.com> Date: Tue, 5 Oct 2021 08:53:53 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.13.0 MIME-Version: 1.0 In-Reply-To: <20211001100610.2899-25-christian.koenig@amd.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit Subject: Re: [Intel-gfx] [PATCH 24/28] drm: use new iterator in drm_gem_plane_helper_prepare_fb 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: , Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" On 01/10/2021 11:06, Christian König wrote: > Makes the handling a bit more complex, but avoids the use of > dma_resv_get_excl_unlocked(). > > Signed-off-by: Christian König > --- > drivers/gpu/drm/drm_gem_atomic_helper.c | 13 +++++++++++-- > 1 file changed, 11 insertions(+), 2 deletions(-) > > diff --git a/drivers/gpu/drm/drm_gem_atomic_helper.c b/drivers/gpu/drm/drm_gem_atomic_helper.c > index e570398abd78..21ed930042b8 100644 > --- a/drivers/gpu/drm/drm_gem_atomic_helper.c > +++ b/drivers/gpu/drm/drm_gem_atomic_helper.c > @@ -143,6 +143,7 @@ > */ > int drm_gem_plane_helper_prepare_fb(struct drm_plane *plane, struct drm_plane_state *state) > { > + struct dma_resv_iter cursor; > struct drm_gem_object *obj; > struct dma_fence *fence; > > @@ -150,9 +151,17 @@ int drm_gem_plane_helper_prepare_fb(struct drm_plane *plane, struct drm_plane_st > return 0; > > obj = drm_gem_fb_get_obj(state->fb, 0); > - fence = dma_resv_get_excl_unlocked(obj->resv); > - drm_atomic_set_fence_for_plane(state, fence); > + dma_resv_iter_begin(&cursor, obj->resv, false); > + dma_resv_for_each_fence_unlocked(&cursor, fence) { > + dma_fence_get(fence); > + dma_resv_iter_end(&cursor); > + /* TODO: We only use the first write fence here */ What is the TODO? NB instead? > + drm_atomic_set_fence_for_plane(state, fence); > + return 0; > + } > + dma_resv_iter_end(&cursor); > > + drm_atomic_set_fence_for_plane(state, NULL); dma_resv_iter_begin(&cursor, obj->resv, false); dma_resv_for_each_fence_unlocked(&cursor, fence) { dma_fence_get(fence); break; } dma_resv_iter_end(&cursor); drm_atomic_set_fence_for_plane(state, fence); Does this work? But overall I am not sure this is nicer. Is the goal to remove dma_resv_get_excl_unlocked as API it just does not happen in this series? Regards, Tvrtko > return 0; > } > EXPORT_SYMBOL_GPL(drm_gem_plane_helper_prepare_fb); >