From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 65A0176C76; Mon, 15 Apr 2024 14:25:21 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1713191121; cv=none; b=SkqSna+W3GZWAyXZ4dv3M9cojoNakxEjIBHv97gS4LRVz/VtIw4EuCdy9PcmXIM5liDiy+mn9mlMQD61mfFh2AVF7oPrTN9rOncCTt028fwggRPGlfw/EzS6WPSQv/TZx6Vey5oo8c3XzQhasCeMCcxAqs7/wIz+EuIMBSBLl18= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1713191121; c=relaxed/simple; bh=GLdem4eXaOPLpxOvtpjKsEOfjbME3Q/G46krdYzHKek=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=ldWykkLDiexv30dOOZE9J/0wd3NdoU+iDgzC0a0N1yHwFY6DCIxH7bqDoLKXJ/SK9zch2jzkGNI1Kj90oWyUEGadSRm+tcAxBsQItSsn2ITF2g3jly4IKK4fObfOvR3U0vQcFv8IULiLIGkd9pVaj4u35zEErqTVnXQhwIpzLDk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=Gw95HeLd; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="Gw95HeLd" Received: by smtp.kernel.org (Postfix) with ESMTPSA id DFD4BC113CC; Mon, 15 Apr 2024 14:25:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1713191121; bh=GLdem4eXaOPLpxOvtpjKsEOfjbME3Q/G46krdYzHKek=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Gw95HeLdFLHrC8RNxVwFsKBBO2LhL547WnbyZ9uS9imLxIEIIDxviiJ+1wHJE8zdS GAS90zXrxSF4dnNn2DOKICUXzBSNJWJ3yvbg5qQV0NS3VXgH+Sz1FAaBXGFPJb+Jc5 UfmA65D7fWKO/Stba/eQKP63kRyc20j36vp6BTj4= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Timo Lindfors , Alex Constantino , Maxime Ripard , Sasha Levin Subject: [PATCH 6.8 038/172] Revert "drm/qxl: simplify qxl_fence_wait" Date: Mon, 15 Apr 2024 16:18:57 +0200 Message-ID: <20240415142001.583923202@linuxfoundation.org> X-Mailer: git-send-email 2.44.0 In-Reply-To: <20240415141959.976094777@linuxfoundation.org> References: <20240415141959.976094777@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.8-stable review patch. If anyone has any objections, please let me know. ------------------ From: Alex Constantino [ Upstream commit 07ed11afb68d94eadd4ffc082b97c2331307c5ea ] This reverts commit 5a838e5d5825c85556011478abde708251cc0776. Changes from commit 5a838e5d5825 ("drm/qxl: simplify qxl_fence_wait") would result in a '[TTM] Buffer eviction failed' exception whenever it reached a timeout. Due to a dependency to DMA_FENCE_WARN this also restores some code deleted by commit d72277b6c37d ("dma-buf: nuke DMA_FENCE_TRACE macros v2"). Fixes: 5a838e5d5825 ("drm/qxl: simplify qxl_fence_wait") Link: https://lore.kernel.org/regressions/ZTgydqRlK6WX_b29@eldamar.lan/ Reported-by: Timo Lindfors Closes: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1054514 Signed-off-by: Alex Constantino Signed-off-by: Maxime Ripard Link: https://patchwork.freedesktop.org/patch/msgid/20240404181448.1643-2-dreaming.about.electric.sheep@gmail.com Signed-off-by: Sasha Levin --- drivers/gpu/drm/qxl/qxl_release.c | 50 +++++++++++++++++++++++++++---- include/linux/dma-fence.h | 7 +++++ 2 files changed, 52 insertions(+), 5 deletions(-) diff --git a/drivers/gpu/drm/qxl/qxl_release.c b/drivers/gpu/drm/qxl/qxl_release.c index 368d26da0d6a2..9febc8b73f09e 100644 --- a/drivers/gpu/drm/qxl/qxl_release.c +++ b/drivers/gpu/drm/qxl/qxl_release.c @@ -58,16 +58,56 @@ static long qxl_fence_wait(struct dma_fence *fence, bool intr, signed long timeout) { struct qxl_device *qdev; + struct qxl_release *release; + int count = 0, sc = 0; + bool have_drawable_releases; unsigned long cur, end = jiffies + timeout; qdev = container_of(fence->lock, struct qxl_device, release_lock); + release = container_of(fence, struct qxl_release, base); + have_drawable_releases = release->type == QXL_RELEASE_DRAWABLE; - if (!wait_event_timeout(qdev->release_event, - (dma_fence_is_signaled(fence) || - (qxl_io_notify_oom(qdev), 0)), - timeout)) - return 0; +retry: + sc++; + + if (dma_fence_is_signaled(fence)) + goto signaled; + + qxl_io_notify_oom(qdev); + + for (count = 0; count < 11; count++) { + if (!qxl_queue_garbage_collect(qdev, true)) + break; + + if (dma_fence_is_signaled(fence)) + goto signaled; + } + + if (dma_fence_is_signaled(fence)) + goto signaled; + + if (have_drawable_releases || sc < 4) { + if (sc > 2) + /* back off */ + usleep_range(500, 1000); + + if (time_after(jiffies, end)) + return 0; + + if (have_drawable_releases && sc > 300) { + DMA_FENCE_WARN(fence, + "failed to wait on release %llu after spincount %d\n", + fence->context & ~0xf0000000, sc); + goto signaled; + } + goto retry; + } + /* + * yeah, original sync_obj_wait gave up after 3 spins when + * have_drawable_releases is not set. + */ +signaled: cur = jiffies; if (time_after(cur, end)) return 0; diff --git a/include/linux/dma-fence.h b/include/linux/dma-fence.h index e06bad467f55e..c3f9bb6602ba2 100644 --- a/include/linux/dma-fence.h +++ b/include/linux/dma-fence.h @@ -682,4 +682,11 @@ static inline bool dma_fence_is_container(struct dma_fence *fence) return dma_fence_is_array(fence) || dma_fence_is_chain(fence); } +#define DMA_FENCE_WARN(f, fmt, args...) \ + do { \ + struct dma_fence *__ff = (f); \ + pr_warn("f %llu#%llu: " fmt, __ff->context, __ff->seqno,\ + ##args); \ + } while (0) + #endif /* __LINUX_DMA_FENCE_H */ -- 2.43.0