From patchwork Mon Mar 20 14:43:24 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Rob Clark X-Patchwork-Id: 665265 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 75E00C6FD1D for ; Mon, 20 Mar 2023 14:44:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231846AbjCTOoh (ORCPT ); Mon, 20 Mar 2023 10:44:37 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50194 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231839AbjCTOog (ORCPT ); Mon, 20 Mar 2023 10:44:36 -0400 Received: from mail-pj1-x102c.google.com (mail-pj1-x102c.google.com [IPv6:2607:f8b0:4864:20::102c]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id ED6E6AD22; Mon, 20 Mar 2023 07:44:34 -0700 (PDT) Received: by mail-pj1-x102c.google.com with SMTP id e15-20020a17090ac20f00b0023d1b009f52so16743708pjt.2; Mon, 20 Mar 2023 07:44:34 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; t=1679323474; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=qOKgIqKype2FtcfBEs8DzVnGdB8jDwzY52kLns1gHeQ=; b=VnF+6G2rX3V3uiMnbJNUCShKHEg3qSXYFZW2BadyVGNW0EATEl8lpaMebXjsuGk82j 6uNC/eXNRKXC6LHgJEGqwFVgVpKr8Ft2sQSWlWoJNn2mcPP6CjiXAakf5VgjfGk741GP sIHFQgcHBE6gPMKsa9eAIRJpEMN/RO4X6UIOevibBEhmVCdoZdol18YJKBu4jexGjC/y xW2lLDNDlqC2S0GLUL1feKz6u5E6vwZDYvzQtXJzzQd8X1JJtWfI4To24/vDTwEUXx1m F3Vs7SviqMHjK5T10Q782LncWJWcxm7mshYIhZNh48C6PEae62pRbnFZfPIvZvxobGNO Zrbg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; t=1679323474; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=qOKgIqKype2FtcfBEs8DzVnGdB8jDwzY52kLns1gHeQ=; b=pi5qHJ7SjUuUHV7uDaBhNVfXi9oBe4l/WhLwJKLH9IJJbrzhjhxnvl4Ldbc5ZIUIha ygAck0Yw9TvKkYRPonfFYrLX482BhupzwffIG+ouG33UhpzbA3q9G0nrsaMXKaOH4LDm GygrmLrtD7bFkmKlDUqWRJAyICU7gN03YbvG5tjRLhCXWrIvTdHo/hzhtXZDELLBokM5 Ziao/0n5+gfVz41UEXx3yM72fQmmcGw6k9zGoabNriXVRBrmjAJM8PWx45Aov2/GWIl/ J7+OJwA9c28Z4WoYtsdZUiwdKYVV+GnlMiS5NE8G8+R0IILiGJSvAplga1Wa+z94W1Gx 4euQ== X-Gm-Message-State: AO0yUKUYmOgai/ksN/n9YzU5wyuNM7Vr0HwV81XtQmWBLUi/H2xL5Nat pLQktBieAi1moKoka0C8EsE= X-Google-Smtp-Source: AK7set87GLedaxfP6MTlGWAVIi2V/FMub1LUUnVtxXaItSj0lTXwOwSmnXTsGsDYl2P+bImVpBwAtQ== X-Received: by 2002:a05:6a20:bb12:b0:da:24f5:ff25 with SMTP id fc18-20020a056a20bb1200b000da24f5ff25mr1307876pzb.48.1679323474431; Mon, 20 Mar 2023 07:44:34 -0700 (PDT) Received: from localhost ([2a00:79e1:abd:4a00:61b:48ed:72ab:435b]) by smtp.gmail.com with ESMTPSA id c26-20020a631c5a000000b00507249cde91sm6186039pgm.91.2023.03.20.07.44.33 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 20 Mar 2023 07:44:34 -0700 (PDT) From: Rob Clark To: dri-devel@lists.freedesktop.org Cc: Daniel Vetter , freedreno@lists.freedesktop.org, linux-arm-msm@vger.kernel.org, Rob Clark , Rob Clark , Abhinav Kumar , Dmitry Baryshkov , Sean Paul , David Airlie , linux-kernel@vger.kernel.org (open list) Subject: [PATCH v2 02/23] drm/msm: Move submit bo flags update from obj lock Date: Mon, 20 Mar 2023 07:43:24 -0700 Message-Id: <20230320144356.803762-3-robdclark@gmail.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230320144356.803762-1-robdclark@gmail.com> References: <20230320144356.803762-1-robdclark@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org From: Rob Clark The flags are only accessed (1) when submit is constructed, before enqueuing to gpu sched (ie. when still visible to only the task calling the submit ioctl), (2) here, where we own a reference to the submit and are serialized on the gpu sched thread, and (3) after the submit is retired and last reference is dropped, which is serialized on the submit's reference count. Hence locking is unneeded here. Signed-off-by: Rob Clark --- drivers/gpu/drm/msm/msm_ringbuffer.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/gpu/drm/msm/msm_ringbuffer.c b/drivers/gpu/drm/msm/msm_ringbuffer.c index a62b45e5a8c3..a80447c8764e 100644 --- a/drivers/gpu/drm/msm/msm_ringbuffer.c +++ b/drivers/gpu/drm/msm/msm_ringbuffer.c @@ -26,8 +26,8 @@ static struct dma_fence *msm_job_run(struct drm_sched_job *job) msm_gem_lock(obj); msm_gem_unpin_vma_fenced(submit->bos[i].vma, fctx); msm_gem_unpin_locked(obj); - submit->bos[i].flags &= ~(BO_VMA_PINNED | BO_OBJ_PINNED); msm_gem_unlock(obj); + submit->bos[i].flags &= ~(BO_VMA_PINNED | BO_OBJ_PINNED); } /* TODO move submit path over to using a per-ring lock.. */