From patchwork Thu Jul 8 17:37:49 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Daniel Vetter X-Patchwork-Id: 12365935 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id D233AC07E96 for ; Thu, 8 Jul 2021 17:38:52 +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 A90326191D for ; Thu, 8 Jul 2021 17:38:52 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org A90326191D Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=ffwll.ch Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=intel-gfx-bounces@lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 140296E970; Thu, 8 Jul 2021 17:38:26 +0000 (UTC) Received: from mail-wr1-x42f.google.com (mail-wr1-x42f.google.com [IPv6:2a00:1450:4864:20::42f]) by gabe.freedesktop.org (Postfix) with ESMTPS id 592006E972 for ; Thu, 8 Jul 2021 17:38:24 +0000 (UTC) Received: by mail-wr1-x42f.google.com with SMTP id q17so8532806wrv.2 for ; Thu, 08 Jul 2021 10:38:24 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ffwll.ch; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=InVnPLy1h+Gn4xVBn/fC7AZt6grH88jqC7oOozTIXb8=; b=b9NfiRDV4PWMagsuaIW/0pNvT/uy7ZDQf5JndjvR8JML4iEvYQWZQL7cwk7QnkWdah oBfpqwwuzxFNgBz0aEff+3SB9zAzKpnDR1DMFi43W07iORhzR0ARnRNGrCQ3kjPtlJLd IJh73WUh20UIq5aO+hBu1ga1TfA/5tOncbrXM= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=InVnPLy1h+Gn4xVBn/fC7AZt6grH88jqC7oOozTIXb8=; b=qR+RwgWKztYx92g2jH3AR8g09Dqtcx0STOnzIz1m7DtH6j5Oc9ay3EA+KTl3AjULWf +LjQAhywIutCcoN7llXYXDzraQ85bp+ovvuhsKg9Gfbe6LnQzOpTNi0Y7yn8bDxA/xlW AXGxxTM8sWouCW62hBN1ORCRyrwBJzBvdAiLbm1Xr7l4rV2tCF9VsPY75oabom/Gh/mZ d4ZHNzi1jFkpHEscAvywl/dPAo0gzQrW+6jwOpWurCLHQrPRnlCasX0JVdadg0PZsVGB wNAmdns7YGsB0xqRdgtotBO7c7c3NXqi/r3zAmtNBXfb1ov5OmvbQUtruDYOdET5llKb N7jg== X-Gm-Message-State: AOAM531s3dqW7y+m5ekMxpkL8mTdsU0CYgRALrBTBrkLdARYNo4EwIIU Qx7XrJg9WIHkXRGphXkglhT4xA== X-Google-Smtp-Source: ABdhPJxD6PJ66owVmAWX8E6gbp7rigz0P4Z2yONzVbgd61fH6Zjzia6NQcSAsJ1vQHjng6a+fpD+Dw== X-Received: by 2002:a5d:4912:: with SMTP id x18mr4269311wrq.310.1625765903128; Thu, 08 Jul 2021 10:38:23 -0700 (PDT) Received: from phenom.ffwll.local ([2a02:168:57f4:0:efd0:b9e5:5ae6:c2fa]) by smtp.gmail.com with ESMTPSA id l4sm2521853wme.26.2021.07.08.10.38.22 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 08 Jul 2021 10:38:22 -0700 (PDT) From: Daniel Vetter To: DRI Development Date: Thu, 8 Jul 2021 19:37:49 +0200 Message-Id: <20210708173754.3877540-16-daniel.vetter@ffwll.ch> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20210708173754.3877540-1-daniel.vetter@ffwll.ch> References: <20210708173754.3877540-1-daniel.vetter@ffwll.ch> MIME-Version: 1.0 Subject: [Intel-gfx] [PATCH v3 15/20] drm/msm: Don't break exclusive fence ordering 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: freedreno@lists.freedesktop.org, Daniel Vetter , Intel Graphics Development , linux-arm-msm@vger.kernel.org, Daniel Vetter , Lucas Stach Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" There's only one exclusive slot, and we must not break the ordering. Adding a new exclusive fence drops all previous fences from the dma_resv. To avoid violating the signalling order we err on the side of over-synchronizing by waiting for the existing fences, even if userspace asked us to ignore them. A better fix would be to us a dma_fence_chain or _array like e.g. amdgpu now uses, but - msm has a synchronous dma_fence_wait for anything from another context, so doesn't seem to care much, - and it probably makes sense to lift this into dma-resv.c code as a proper concept, so that drivers don't have to hack up their own solution each on their own. v2: Improve commit message per Lucas' suggestion. Cc: Lucas Stach Signed-off-by: Daniel Vetter Cc: Rob Clark Cc: Sean Paul Cc: linux-arm-msm@vger.kernel.org Cc: freedreno@lists.freedesktop.org --- drivers/gpu/drm/msm/msm_gem_submit.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/msm/msm_gem_submit.c b/drivers/gpu/drm/msm/msm_gem_submit.c index b71da71a3dd8..edd0051d849f 100644 --- a/drivers/gpu/drm/msm/msm_gem_submit.c +++ b/drivers/gpu/drm/msm/msm_gem_submit.c @@ -306,7 +306,8 @@ static int submit_fence_sync(struct msm_gem_submit *submit, bool no_implicit) return ret; } - if (no_implicit) + /* exclusive fences must be ordered */ + if (no_implicit && !write) continue; ret = msm_gem_sync_object(&msm_obj->base, submit->ring->fctx,