From patchwork Wed Jul 13 15:20:17 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrzej Hajda X-Patchwork-Id: 12916894 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 ACDA8C43334 for ; Wed, 13 Jul 2022 15:24:20 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 09AF8992B9; Wed, 13 Jul 2022 15:24:20 +0000 (UTC) Received: from mga01.intel.com (mga01.intel.com [192.55.52.88]) by gabe.freedesktop.org (Postfix) with ESMTPS id CA3C099469; Wed, 13 Jul 2022 15:24:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1657725858; x=1689261858; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=1QhT6jQXOf5LANxgn9whzxYWaxnwk7I0tnGhga3K4lI=; b=dwBViIaDevxFOuaO0Qtp5di21/DPG4chXxsq6+h9EdTXL1AI10lFojMF 3VBX3rjOfWEbtALrNt0Nbi0bQxP+PaTLW5BStLUwdWWqtJ/b48Hs2UUt/ CxiMCBybD9TC1YfS5+3WYRYdZArdby409BWdC+yipm3lL1sTeLtE/UWQu RyIRSbkrXiwaiS8HdT+dOokIvGn8rBAIC24ulavgalL3fEmLD9NWMDnRw Pn18RGPtCU6vVztRr99iNw85YuPpq1X2YM3ccZCCGAKkuF83/kaFJOJnj DMbeKL0aOcQwH44kPZcaVFZtJMG5/020yA/pY/5l1EVM9iXyZkO7leUc8 g==; X-IronPort-AV: E=McAfee;i="6400,9594,10407"; a="310880956" X-IronPort-AV: E=Sophos;i="5.92,267,1650956400"; d="scan'208";a="310880956" Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by fmsmga101.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 13 Jul 2022 08:20:32 -0700 X-IronPort-AV: E=Sophos;i="5.92,267,1650956400"; d="scan'208";a="922669067" Received: from lab-ah.igk.intel.com ([10.91.215.196]) by fmsmga005-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 13 Jul 2022 08:20:30 -0700 From: Andrzej Hajda To: Jani Nikula , =?utf-8?b?VmlsbGUgU3lyasOk?= =?utf-8?b?bMOk?= , Arun R Murthy Date: Wed, 13 Jul 2022 17:20:17 +0200 Message-Id: <20220713152019.343432-2-andrzej.hajda@intel.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220713152019.343432-1-andrzej.hajda@intel.com> References: <20220713152019.343432-1-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 v3 1/3] drm/i915/hpd: postpone HPD cancel work after last user suspension 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, 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 --- drivers/gpu/drm/i915/display/intel_display.c | 3 +++ drivers/gpu/drm/i915/i915_irq.c | 1 - 2 files changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c index 903226e2a6260d..ec8e59b3adaea7 100644 --- a/drivers/gpu/drm/i915/display/intel_display.c +++ b/drivers/gpu/drm/i915/display/intel_display.c @@ -9007,6 +9007,9 @@ void intel_modeset_driver_remove_noirq(struct drm_i915_private *i915) */ intel_dp_mst_suspend(i915); + /* MST is the last user of HPD work */ + intel_hpd_cancel_work(i915); + /* poll work can call into fbdev, hence clean that up afterwards */ intel_fbdev_fini(i915); diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c index 73cebc6aa65072..db14787aef95dd 100644 --- a/drivers/gpu/drm/i915/i915_irq.c +++ b/drivers/gpu/drm/i915/i915_irq.c @@ -4597,7 +4597,6 @@ void intel_irq_uninstall(struct drm_i915_private *dev_priv) free_irq(irq, dev_priv); - intel_hpd_cancel_work(dev_priv); dev_priv->runtime_pm.irqs_enabled = false; }