From patchwork Fri Sep 24 16:38:25 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Janusz Krzysztofik X-Patchwork-Id: 12516053 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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id AC6DFC433F5 for ; Fri, 24 Sep 2021 16:38:48 +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 698E1610C7 for ; Fri, 24 Sep 2021 16:38:48 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 698E1610C7 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.intel.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 7415F6E1ED; Fri, 24 Sep 2021 16:38:47 +0000 (UTC) Received: from mga02.intel.com (mga02.intel.com [134.134.136.20]) by gabe.freedesktop.org (Postfix) with ESMTPS id 468FC6E1ED; Fri, 24 Sep 2021 16:38:46 +0000 (UTC) X-IronPort-AV: E=McAfee;i="6200,9189,10117"; a="211354079" X-IronPort-AV: E=Sophos;i="5.85,320,1624345200"; d="scan'208";a="211354079" Received: from fmsmga008.fm.intel.com ([10.253.24.58]) by orsmga101.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 24 Sep 2021 09:38:45 -0700 X-IronPort-AV: E=Sophos;i="5.85,320,1624345200"; d="scan'208";a="516087633" Received: from jkrzyszt-mobl1.ger.corp.intel.com ([10.213.4.8]) by fmsmga008-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 24 Sep 2021 09:38:42 -0700 From: Janusz Krzysztofik To: intel-gfx@lists.freedesktop.org Cc: dri-devel@lists.freedesktop.org, Chris Wilson , Matt Roper , Janusz Krzysztofik Subject: [PATCH v2] drm/i915: Flush buffer pools on driver remove Date: Fri, 24 Sep 2021 18:38:25 +0200 Message-Id: <20210924163825.634606-1-janusz.krzysztofik@linux.intel.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" We currently do an explicit flush of the buffer pools within the call path of drm_driver.release(); this removes all buffers, regardless of their age, freeing the buffers' associated resources (objects, adress space areas). However there is other code that runs within the drm_driver.release() call chain that expects objects and their associated address space areas have already been flushed. Since buffer pools auto-flush old buffers once per second in a worker thread, there's a small window where if we remove the driver while there are still objects in buffers with an age of less than one second, the assumptions of the other release code may be violated. By moving the flush to driver remove (which executes earlier via the pci_driver.remove() flow) we're ensuring that all buffers are flushed and their associated objects freed before some other code in pci_driver.remove() flushes those objects so they are released before _any_ code in drm_driver.release() that check completness of those flushes executes. v2: Reword commit descriptiom as suggested by Matt. Signed-off-by: Janusz Krzysztofik Cc: Chris Wilson Cc: Matt Roper Reviewed-by: Matt Roper --- drivers/gpu/drm/i915/gt/intel_gt.c | 2 ++ drivers/gpu/drm/i915/gt/intel_gt_buffer_pool.c | 2 -- 2 files changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/i915/gt/intel_gt.c b/drivers/gpu/drm/i915/gt/intel_gt.c index 4037c3778225..5b3acf2b064e 100644 --- a/drivers/gpu/drm/i915/gt/intel_gt.c +++ b/drivers/gpu/drm/i915/gt/intel_gt.c @@ -741,6 +741,8 @@ void intel_gt_driver_remove(struct intel_gt *gt) intel_uc_driver_remove(>->uc); intel_engines_release(gt); + + intel_gt_flush_buffer_pool(gt); } void intel_gt_driver_unregister(struct intel_gt *gt) diff --git a/drivers/gpu/drm/i915/gt/intel_gt_buffer_pool.c b/drivers/gpu/drm/i915/gt/intel_gt_buffer_pool.c index aa0a59c5b614..acc49c56a9f3 100644 --- a/drivers/gpu/drm/i915/gt/intel_gt_buffer_pool.c +++ b/drivers/gpu/drm/i915/gt/intel_gt_buffer_pool.c @@ -245,8 +245,6 @@ void intel_gt_fini_buffer_pool(struct intel_gt *gt) struct intel_gt_buffer_pool *pool = >->buffer_pool; int n; - intel_gt_flush_buffer_pool(gt); - for (n = 0; n < ARRAY_SIZE(pool->cache_list); n++) GEM_BUG_ON(!list_empty(&pool->cache_list[n])); }