From patchwork Fri Aug 26 14:19:27 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrzej Hajda X-Patchwork-Id: 12956067 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 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 smtp.lore.kernel.org (Postfix) with ESMTPS id 6BFC1ECAAD4 for ; Fri, 26 Aug 2022 14:20:00 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 1F9B110E92A; Fri, 26 Aug 2022 14:19:55 +0000 (UTC) Received: from mga02.intel.com (mga02.intel.com [134.134.136.20]) by gabe.freedesktop.org (Postfix) with ESMTPS id DB26D10E927; Fri, 26 Aug 2022 14:19:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1661523590; x=1693059590; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=c+pXcbsPx/rMzdeWU+Wdyx39q2fdykDrG2BhCL1DuEc=; b=STkbRpvXHaTMiOGD9XMWc1s5ZzMyyJgVcSqzDqP3+giRok9DCStux6H9 DslMZV2d/QKecqAOJxzXAFN7bZsR1OSUt+vzJlA+JofHjnQjgI0f5uydO ILsyOM5cG7yYIzcQp/E2MznmB1ncQGg1rSqk7Z3blebcgZoDCkxG3U/UB JiOYh0go1q/nP5p6J4uZWTRikOw9pDyhpQgRBZCAGA+GmYzArYAsWKeZW wL9blf9p/SdZgi8PocBdGeJRxR7KdGI0mMmFcunTgbBRizZvUHe/lWNcV 6huXQpu9QLckZqAY/E3kSlbJeHcjMPRkVHIg5oYnlA8jtbq4qEFe7wBfP g==; X-IronPort-AV: E=McAfee;i="6500,9779,10451"; a="281485729" X-IronPort-AV: E=Sophos;i="5.93,265,1654585200"; d="scan'208";a="281485729" Received: from orsmga006.jf.intel.com ([10.7.209.51]) by orsmga101.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 26 Aug 2022 07:19:50 -0700 X-IronPort-AV: E=Sophos;i="5.93,265,1654585200"; d="scan'208";a="587313659" Received: from lab-ah.igk.intel.com ([10.91.215.196]) by orsmga006-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 26 Aug 2022 07:19:47 -0700 From: Andrzej Hajda To: Jani Nikula , =?utf-8?b?VmlsbGUgU3lyasOk?= =?utf-8?b?bMOk?= , Arun R Murthy , Imre Deak Date: Fri, 26 Aug 2022 16:19:27 +0200 Message-Id: <20220826141929.189681-2-andrzej.hajda@intel.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220826141929.189681-1-andrzej.hajda@intel.com> References: <20220826141929.189681-1-andrzej.hajda@intel.com> MIME-Version: 1.0 Organization: Intel Technology Poland sp. z o.o. - ul. Slowackiego 173, 80-298 Gdansk - KRS 101882 - NIP 957-07-52-316 Subject: [Intel-gfx] [PATCH v7 1/3] drm/i915/hpd: suspend MST at the end of intel_modeset_driver_remove 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: Andrzej Hajda , intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, Daniel Vetter , Rodrigo Vivi Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" i915->hotplug.dig_port_work can be queued from intel_hpd_irq_handler called by IRQ handler or by intel_hpd_trigger_irq called from dp_mst. Since dp_mst is suspended after irq handler uninstall, a cleaner approach is to cancel hpd work after intel_dp_mst_suspend, otherwise we risk use-after-free. It should fix following WARNINGS: [283.405824] cpu_latency_qos_update_request called for unknown object [283.405866] WARNING: CPU: 2 PID: 240 at kernel/power/qos.c:296 cpu_latency_qos_update_request+0x2d/0x100 [283.405912] CPU: 2 PID: 240 Comm: kworker/u64:9 Not tainted 5.18.0-rc6-Patchwork_103738v3-g1672d1c43e43+ #1 [283.405915] Hardware name: Intel Corporation Raptor Lake Client Platform/RPL-S ADP-S DDR5 UDIMM CRB, BIOS RPLSFWI1.R00.2397.A01.2109300731 09/30/2021 [283.405916] Workqueue: i915-dp i915_digport_work_func [i915] [283.406020] RIP: 0010:cpu_latency_qos_update_request+0x2d/0x100 ... [283.406040] Call Trace: [283.406041] [283.406044] intel_dp_aux_xfer+0x60e/0x8e0 [i915] [283.406131] ? finish_swait+0x80/0x80 [283.406139] intel_dp_aux_transfer+0xc5/0x2b0 [i915] [283.406218] drm_dp_dpcd_access+0x79/0x130 [drm_display_helper] [283.406227] drm_dp_dpcd_read+0xe2/0xf0 [drm_display_helper] [283.406233] intel_dp_hpd_pulse+0x134/0x570 [i915] [283.406308] ? __down_killable+0x70/0x140 [283.406313] i915_digport_work_func+0xba/0x150 [i915] Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/4586 Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/5558 Signed-off-by: Andrzej Hajda Reviewed-by: Arun R Murthy Reviewed-by: Imre Deak --- drivers/gpu/drm/i915/display/intel_display.c | 14 +++++++------- 1 file changed, 7 insertions(+), 7 deletions(-) diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c index a0f84cbe974fc3..524c4580ae6bc9 100644 --- a/drivers/gpu/drm/i915/display/intel_display.c +++ b/drivers/gpu/drm/i915/display/intel_display.c @@ -9000,6 +9000,13 @@ void intel_modeset_driver_remove(struct drm_i915_private *i915) flush_work(&i915->atomic_helper.free_work); drm_WARN_ON(&i915->drm, !llist_empty(&i915->atomic_helper.free_list)); + + /* + * MST topology needs to be suspended so we don't have any calls to + * fbdev after it's finalized. MST will be destroyed later as part of + * drm_mode_config_cleanup() + */ + intel_dp_mst_suspend(i915); } /* part #2: call after irq uninstall */ @@ -9014,13 +9021,6 @@ void intel_modeset_driver_remove_noirq(struct drm_i915_private *i915) */ intel_hpd_poll_fini(i915); - /* - * MST topology needs to be suspended so we don't have any calls to - * fbdev after it's finalized. MST will be destroyed later as part of - * drm_mode_config_cleanup() - */ - intel_dp_mst_suspend(i915); - /* poll work can call into fbdev, hence clean that up afterwards */ intel_fbdev_fini(i915);