From nobody Fri Oct 24 13:48:27 2025 Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.20]) (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 A3DF528D82A for ; Tue, 21 Oct 2025 21:39:58 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.175.65.20 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1761082800; cv=none; b=jYsD0MSg3RgWbYefRYAxl1tBadevy+pQY2RQnrAuN823ik0k8aoSdxHGxly9Kjce5t9v66Qfu3yNHUF92NTDkKrjgtCPzKABjni99Nvjctr/xiRcGLDpm+mfw6ZwzJLjEIx8E6EegEL1EIIGyxzoeZaIfvu2Ua6r3apDyBBbwZc= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1761082800; c=relaxed/simple; bh=iW/BcUJLCLLlHu2nMhEhUz1mgvhc+oR29dpeVfRwugQ=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version:Content-Type; b=asjovs7+ZjJn0rLl3qgoWlQI85IIL1nyUcWL5thiN35Qq6lEGUJzeYZe4JnNF3/6vM2CkSwzc1SQMA4Lb3Ej45IZcekq/6n1Ae/qr3wKeKgnZxVFXKFqGPLtkQAvhOxhghHsz5APTXysKM/5nwn6CkBnLw/3WcrbiGLhDfecd7s= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com; spf=pass smtp.mailfrom=intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=EvZkWawf; arc=none smtp.client-ip=198.175.65.20 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="EvZkWawf" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1761082799; x=1792618799; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=iW/BcUJLCLLlHu2nMhEhUz1mgvhc+oR29dpeVfRwugQ=; b=EvZkWawfOvhZSc4kvqcfHM6ifCSaArLD98iSKjLvcdzd6a5TSczaTcrL WTMvtOkskOnE9k0lTkTMcI/+UYh0moIUraKtKGrcYX7YC7K0lKDCpeW0J kSLXwZt/fqqlpdgcH5q403NH17+KcvQfCeCvdQhRUPAzxQlY2cJ4wDl+I 1cOPO33i5DqZ3IdF0kDabrsF4GnAUMSPq3GurfN0patut1XJjbV8PXBO4 MeKa3Yx/928wkROmueSwL205eVplzvpcoedvuhfACiQqLWpZ7K+LXu8iZ CLahExdwIEFMFc5abIVMuOnrZxplgHl4wUCakbAREJqcCrK8AEshlXESF Q==; X-CSE-ConnectionGUID: WOjj5WLES8Gzwcw5cO0Gjw== X-CSE-MsgGUID: 9O4UztQCQUyEgkkDOEg22A== X-IronPort-AV: E=McAfee;i="6800,10657,11586"; a="62923174" X-IronPort-AV: E=Sophos;i="6.19,245,1754982000"; d="scan'208";a="62923174" Received: from fmviesa008.fm.intel.com ([10.60.135.148]) by orvoesa112.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 21 Oct 2025 14:39:57 -0700 X-CSE-ConnectionGUID: 5kZ3gezoRQ2L5SMtTVCJOg== X-CSE-MsgGUID: 7LQ0VDHOTzmkZBnZ5Rs0Vw== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.19,245,1754982000"; d="scan'208";a="184099255" Received: from lstrano-desk.jf.intel.com ([10.54.39.91]) by fmviesa008-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 21 Oct 2025 14:39:56 -0700 From: Matthew Brost To: intel-xe@lists.freedesktop.org, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org Cc: jiangshanlai@gmail.com, tj@kernel.org, simona.vetter@ffwll.ch, christian.koenig@amd.com, pstanner@redhat.com, dakr@kernel.org Subject: [RFC PATCH 2/3] drm/sched: Taint workqueues with reclaim Date: Tue, 21 Oct 2025 14:39:51 -0700 Message-Id: <20251021213952.746900-3-matthew.brost@intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20251021213952.746900-1-matthew.brost@intel.com> References: <20251021213952.746900-1-matthew.brost@intel.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Multiple drivers seemingly do not understand the role of DMA fences in the reclaim path. As a result, DRM scheduler workqueues, which are part of the fence signaling path, must not allocate memory. This patch teaches lockdep to recognize these rules in order to catch driver-side bugs. Cc: Christian K=C3=B6nig Cc: Danilo Krummrich Cc: Matthew Brost Cc: Philipp Stanner Cc: dri-devel@lists.freedesktop.org Signed-off-by: Matthew Brost --- drivers/gpu/drm/scheduler/sched_main.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/gpu/drm/scheduler/sched_main.c b/drivers/gpu/drm/sched= uler/sched_main.c index c39f0245e3a9..676484dd3ea3 100644 --- a/drivers/gpu/drm/scheduler/sched_main.c +++ b/drivers/gpu/drm/scheduler/sched_main.c @@ -1368,6 +1368,9 @@ int drm_sched_init(struct drm_gpu_scheduler *sched, c= onst struct drm_sched_init_ atomic64_set(&sched->job_id_count, 0); sched->pause_submit =3D false; =20 + taint_reclaim_workqueue(sched->submit_wq, GFP_KERNEL); + taint_reclaim_workqueue(sched->timeout_wq, GFP_KERNEL); + sched->ready =3D true; return 0; Out_unroll: --=20 2.34.1