From patchwork Wed May 19 10:15:23 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Daniel Vetter X-Patchwork-Id: 12266837 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=-16.5 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=unavailable 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 D98F0C433ED for ; Wed, 19 May 2021 10:15:37 +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 9DECB6135B for ; Wed, 19 May 2021 10:15:37 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 9DECB6135B 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 DD8276ECFC; Wed, 19 May 2021 10:15:35 +0000 (UTC) Received: from mail-wr1-x434.google.com (mail-wr1-x434.google.com [IPv6:2a00:1450:4864:20::434]) by gabe.freedesktop.org (Postfix) with ESMTPS id A0C0B6ECF9 for ; Wed, 19 May 2021 10:15:33 +0000 (UTC) Received: by mail-wr1-x434.google.com with SMTP id i17so13374147wrq.11 for ; Wed, 19 May 2021 03:15:33 -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=DLSDac+zFZCvuOxhlqODKoOPK9Xt9GPFhoNCyvTD8Gg=; b=VE3Te1/ELmmu2l86Lyr6KvezntZCLWf3JxFRLBAdIc98DxKufyJcGGYNgU6jEpk1us MePhBlWICyHVnWm6snPH7aXxkaEjHarlT8pnHfK0kBuBwRXIdYViL8BJYIifkmOzh/iC 57UyC4tMTfhAVC1r/33TyCzLN6Qwpars8fO4w= 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=DLSDac+zFZCvuOxhlqODKoOPK9Xt9GPFhoNCyvTD8Gg=; b=t9+N9Ma+cXWYE8QGDOAQMWbcxoYKgTVoanCbB3r1yup4NxpxcnNCf4RCRkapmctXLn zWoYIbJUOnWsO7HuFHO1ktW3Azmidg8UTZ2jdnI6Mn1iMBQprXJfBJkXaqonglBzYXlV +hpIYexv3Y0yTjtF0n1/hONS+iC6FJJrA+MdvjtJ76w484cmJIzBT0QPeuAg6RuPO0YB e++DQb6ZGbAtcbcxHUSDySVD/n2eVnnbCWLQUreBq4Ort//4e+3YA4opF68rM9gB/bxZ +slCvQ9FqUmobOGCEwCW/PuG23+Z+HlGdx2kTylCr+xCzALYG+AiwsqXMKfwNTLkcwm9 BG6A== X-Gm-Message-State: AOAM531EIMKldJaLnXQdx+sg0rg3Ou+8739vYlVayblpwBfJCY85bKJq dQ6+o4DscmfD62FKX2vaPVsNLZpZtJnvUg== X-Google-Smtp-Source: ABdhPJyO4uSwCzhB8EODPl4WGgU0IKdKHfwW8l5xIaB3JUwY+ZsaqHCkvbPehwjj6lBFCrttZTHPBQ== X-Received: by 2002:adf:f309:: with SMTP id i9mr13931576wro.307.1621419332273; Wed, 19 May 2021 03:15:32 -0700 (PDT) Received: from phenom.ffwll.local ([2a02:168:57f4:0:efd0:b9e5:5ae6:c2fa]) by smtp.gmail.com with ESMTPSA id d3sm25215307wrs.41.2021.05.19.03.15.31 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 19 May 2021 03:15:31 -0700 (PDT) From: Daniel Vetter To: Intel Graphics Development , DRI Development Date: Wed, 19 May 2021 12:15:23 +0200 Message-Id: <20210519101523.688398-1-daniel.vetter@ffwll.ch> X-Mailer: git-send-email 2.31.0 In-Reply-To: <20210519074323.665872-2-daniel.vetter@ffwll.ch> References: <20210519074323.665872-2-daniel.vetter@ffwll.ch> MIME-Version: 1.0 Subject: [Intel-gfx] [PATCH] Revert "drm/i915: Propagate errors on awaiting already signaled fences" 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: Daniel Vetter , stable@vger.kernel.org, Jason Ekstrand Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" From: Jason Ekstrand This reverts commit 9e31c1fe45d555a948ff66f1f0e3fe1f83ca63f7. Ever since that commit, we've been having issues where a hang in one client can propagate to another. In particular, a hang in an app can propagate to the X server which causes the whole desktop to lock up. Error propagation along fences sound like a good idea, but as your bug shows, surprising consequences, since propagating errors across security boundaries is not a good thing. What we do have is track the hangs on the ctx, and report information to userspace using RESET_STATS. That's how arb_robustness works. Also, if my understanding is still correct, the EIO from execbuf is when your context is banned (because not recoverable or too many hangs). And in all these cases it's up to userspace to figure out what is all impacted and should be reported to the application, that's not on the kernel to guess and automatically propagate. What's more, we're also building more features on top of ctx error reporting with RESET_STATS ioctl: Encrypted buffers use the same, and the userspace fence wait also relies on that mechanism. So it is the path going forward for reporting gpu hangs and resets to userspace. So all together that's why I think we should just bury this idea again as not quite the direction we want to go to, hence why I think the revert is the right option here.Signed-off-by: Jason Ekstrand v2: Augment commit message. Also restore Jason's sob that I accidentally lost. Signed-off-by: Jason Ekstrand (v1) Reported-by: Marcin Slusarz Cc: # v5.6+ Cc: Jason Ekstrand Cc: Marcin Slusarz Cc: Jon Bloomfield Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/3080 Fixes: 9e31c1fe45d5 ("drm/i915: Propagate errors on awaiting already signaled fences") Signed-off-by: Daniel Vetter --- drivers/gpu/drm/i915/i915_request.c | 8 ++------ 1 file changed, 2 insertions(+), 6 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_request.c b/drivers/gpu/drm/i915/i915_request.c index 970d8f4986bb..b796197c0772 100644 --- a/drivers/gpu/drm/i915/i915_request.c +++ b/drivers/gpu/drm/i915/i915_request.c @@ -1426,10 +1426,8 @@ i915_request_await_execution(struct i915_request *rq, do { fence = *child++; - if (test_bit(DMA_FENCE_FLAG_SIGNALED_BIT, &fence->flags)) { - i915_sw_fence_set_error_once(&rq->submit, fence->error); + if (test_bit(DMA_FENCE_FLAG_SIGNALED_BIT, &fence->flags)) continue; - } if (fence->context == rq->fence.context) continue; @@ -1527,10 +1525,8 @@ i915_request_await_dma_fence(struct i915_request *rq, struct dma_fence *fence) do { fence = *child++; - if (test_bit(DMA_FENCE_FLAG_SIGNALED_BIT, &fence->flags)) { - i915_sw_fence_set_error_once(&rq->submit, fence->error); + if (test_bit(DMA_FENCE_FLAG_SIGNALED_BIT, &fence->flags)) continue; - } /* * Requests on the same timeline are explicitly ordered, along