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 X-Spam-Level: X-Spam-Status: No, score=-9.9 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,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 56C8CC433E1 for ; Tue, 19 May 2020 13:28:06 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3646220829 for ; Tue, 19 May 2020 13:28:06 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=ffwll.ch header.i=@ffwll.ch header.b="JUB9zXMh" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728388AbgESN2F (ORCPT ); Tue, 19 May 2020 09:28:05 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47050 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726471AbgESN2F (ORCPT ); Tue, 19 May 2020 09:28:05 -0400 Received: from mail-wr1-x444.google.com (mail-wr1-x444.google.com [IPv6:2a00:1450:4864:20::444]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BA547C08C5C0 for ; Tue, 19 May 2020 06:28:04 -0700 (PDT) Received: by mail-wr1-x444.google.com with SMTP id l17so15928945wrr.4 for ; Tue, 19 May 2020 06:28:04 -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:mime-version :content-transfer-encoding; bh=hM5OXAptbKPP/8+yKuT4RVgcPXCSJuvxjvItOcy5Ch4=; b=JUB9zXMhx3IM69uNuCaGPLpgNhM5ZRwyVZ5kb0gbG6jKM48juOC5th7p4u10t6jVoO YfTIxKkevTaESlEO462+goKgJtOvUNl34FxAkta5T0Nsb9E9KujbymSahURdiNV6u8ls BacBPl5XG/yx7XZo7SlEHPm6RYXO2+gzLmayU= 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:mime-version :content-transfer-encoding; bh=hM5OXAptbKPP/8+yKuT4RVgcPXCSJuvxjvItOcy5Ch4=; b=lGBbnvJlVlte4alPOOT2aAlFI4KAGxlGmdBMfwY72M3tWoYbN35OxbFVxJDxqVRgZf +JtTV8scfYsrNzaTHv6o9yTR0HQJFawCnQuzlx+FdnqdxSNtRRR+vanzuVL8zKT7g8Ka d3rbbCkJ30V4RxpkiQge0DIvthPT5kKgruTE9FkpUslZvFZ9KobalD/pc1xQuFdXOx1G ADFB6GibhdvW1h3imfzPkN116mmEmVKRwQwkCTx4/JsmYJYszc3nofqiAttpl9Qm/pX3 PWm4NTt+kkFB66dyJ2l7VTjrIqliLohKhTfLUESgo6mLeebaZrna5tgX8ca9dpwi/dG+ rjGw== X-Gm-Message-State: AOAM531O9gDqYnLwvXQwKinJoKf8nfirUx5LA5p6Gq0RD7Wwf5Ii0x9c BRa8qe0A+DML/l7b40J/IJ6IQubAqSw= X-Google-Smtp-Source: ABdhPJzSWGtPCk2INREnYHV0P2JSQYvdRopa+WJ/sS5YMlaRPcHSE74y7pbs0cpiCamKX4cFMl9Z/Q== X-Received: by 2002:adf:8b98:: with SMTP id o24mr26575236wra.156.1589894883485; Tue, 19 May 2020 06:28:03 -0700 (PDT) Received: from phenom.ffwll.local ([2a02:168:57f4:0:efd0:b9e5:5ae6:c2fa]) by smtp.gmail.com with ESMTPSA id n9sm4092620wmj.5.2020.05.19.06.28.02 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 19 May 2020 06:28:02 -0700 (PDT) From: Daniel Vetter To: DRI Development Cc: LKML , Daniel Vetter , Alex Deucher , Lucas Stach , Jani Nikula , Joonas Lahtinen , Rodrigo Vivi , Ben Skeggs , "VMware Graphics" , Oded Gabbay , linux-media@vger.kernel.org, linaro-mm-sig@lists.linaro.org, linux-rdma@vger.kernel.org, amd-gfx@lists.freedesktop.org, intel-gfx@lists.freedesktop.org, Chris Wilson , Maarten Lankhorst , =?UTF-8?q?Christian=20K=C3=B6nig?= , Daniel Vetter Subject: [PATCH] dma-fence: add might_sleep annotation to _wait() Date: Tue, 19 May 2020 15:27:56 +0200 Message-Id: <20200519132756.682888-1-daniel.vetter@ffwll.ch> X-Mailer: git-send-email 2.26.2 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-rdma-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-rdma@vger.kernel.org Do it uncontionally, there's a separate peek function with dma_fence_is_signalled() which can be called from atomic context. v2: Consensus calls for an unconditional might_sleep (Chris, Christian) Full audit: - dma-fence.h: Uses MAX_SCHEDULE_TIMOUT, good chance this sleeps - dma-resv.c: Timeout always at least 1 - st-dma-fence.c: Save to sleep in testcases - amdgpu_cs.c: Both callers are for variants of the wait ioctl - amdgpu_device.c: Two callers in vram recover code, both right next to mutex_lock. - amdgpu_vm.c: Use in the vm_wait ioctl, next to _reserve/unreserve - remaining functions in amdgpu: All for test_ib implementations for various engines, caller for that looks all safe (debugfs, driver load, reset) - etnaviv: another wait ioctl - habanalabs: another wait ioctl - nouveau_fence.c: hardcoded 15*HZ ... glorious - nouveau_gem.c: hardcoded 2*HZ ... so not even super consistent, but this one does have a WARN_ON :-/ At least this one is only a fallback path for when kmalloc fails. Maybe this should be put onto some worker list instead, instead of a work per unamp ... - i915/selftests: Hardecoded HZ / 4 or HZ / 8 - i915/gt/selftests: Going up the callchain looks safe looking at nearby callers - i915/gt/intel_gt_requests.c. Wrapped in a mutex_lock - i915/gem_i915_gem_wait.c: The i915-version which is called instead for i915 fences already has a might_sleep() annotation, so all good Cc: Alex Deucher Cc: Lucas Stach Cc: Jani Nikula Cc: Joonas Lahtinen Cc: Rodrigo Vivi Cc: Ben Skeggs Cc: "VMware Graphics" Cc: Oded Gabbay Cc: linux-media@vger.kernel.org Cc: linaro-mm-sig@lists.linaro.org Cc: linux-rdma@vger.kernel.org Cc: amd-gfx@lists.freedesktop.org Cc: intel-gfx@lists.freedesktop.org Cc: Chris Wilson Cc: Maarten Lankhorst Cc: Christian König Signed-off-by: Daniel Vetter --- drivers/dma-buf/dma-fence.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/dma-buf/dma-fence.c b/drivers/dma-buf/dma-fence.c index 90edf2b281b0..656e9ac2d028 100644 --- a/drivers/dma-buf/dma-fence.c +++ b/drivers/dma-buf/dma-fence.c @@ -208,6 +208,8 @@ dma_fence_wait_timeout(struct dma_fence *fence, bool intr, signed long timeout) if (WARN_ON(timeout < 0)) return -EINVAL; + might_sleep(); + trace_dma_fence_wait_start(fence); if (fence->ops->wait) ret = fence->ops->wait(fence, intr, timeout); -- 2.26.2 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 X-Spam-Level: X-Spam-Status: No, score=-9.6 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, 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 6A59DC433E4 for ; Tue, 19 May 2020 13:28:08 +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 40418207D8 for ; Tue, 19 May 2020 13:28:08 +0000 (UTC) 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Message-Id: <20200519132756.682888-1-daniel.vetter@ffwll.ch> X-Mailer: git-send-email 2.26.2 MIME-Version: 1.0 X-BeenThere: amd-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Discussion list for AMD gfx List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Oded Gabbay , amd-gfx@lists.freedesktop.org, linux-rdma@vger.kernel.org, Daniel Vetter , intel-gfx@lists.freedesktop.org, Joonas Lahtinen , Maarten Lankhorst , LKML , Jani Nikula , Chris Wilson , linaro-mm-sig@lists.linaro.org, VMware Graphics , Ben Skeggs , Rodrigo Vivi , Alex Deucher , Daniel Vetter , linux-media@vger.kernel.org, =?UTF-8?q?Christian=20K=C3=B6nig?= , Lucas Stach Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Errors-To: amd-gfx-bounces@lists.freedesktop.org Sender: "amd-gfx" RG8gaXQgdW5jb250aW9uYWxseSwgdGhlcmUncyBhIHNlcGFyYXRlIHBlZWsgZnVuY3Rpb24gd2l0 aApkbWFfZmVuY2VfaXNfc2lnbmFsbGVkKCkgd2hpY2ggY2FuIGJlIGNhbGxlZCBmcm9tIGF0b21p 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