From nobody Tue Sep 29 04:11:39 2026 Received: from CH5PR02CU005.outbound.protection.outlook.com (mail-northcentralusazon11012060.outbound.protection.outlook.com [40.107.200.60]) (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 535653EFD24 for ; Wed, 12 Aug 2026 21:44:29 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=fail smtp.client-ip=40.107.200.60 ARC-Seal: i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786571070; cv=fail; b=mDl1QZk6K1ZkVENKZIOJCsDDKuJs2bys92U7LKT8J7Rynoof3UVw06z+6ICE3RBM02bOSi+bxavT3XFDTr4KoIpzO1w+KZ7px2DfZC3ZpD+OBaDeR4efVp0sA5R1jqKc6HQzXdpRyyB+SwLcuRdfvPGRcc1ov+uDKv6oRM9kvtE= ARC-Message-Signature: i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786571070; c=relaxed/simple; bh=EfqJk99VrFGMgLXcfyBpPrM91IFFVLBCi5YS/3MYoe4=; h=From:To:CC:Subject:Date:Message-ID:MIME-Version:Content-Type; b=KkkW59KrS8JTWunW1X2Xr6Nd3RgNQpe6pHnnrD+kB0E7T3dvXERIkIAkALBGkIAO8dvLz5oW+mwsAdRr9eI4rIZ7Oz4zCsfoXCExbLR9Ngg054Bas9Gh1yw0AsZzPIbfPHLaDuE3bdMkbtWU3D6zIfhGrzAjc9yr4Y84BmSvgZY= ARC-Authentication-Results: i=2; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=amd.com; spf=fail smtp.mailfrom=amd.com; dkim=pass (1024-bit key) header.d=amd.com header.i=@amd.com header.b=vlQRyn8q; arc=fail smtp.client-ip=40.107.200.60 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=amd.com Authentication-Results: smtp.subspace.kernel.org; spf=fail smtp.mailfrom=amd.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=amd.com header.i=@amd.com header.b="vlQRyn8q" ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=vmEVxgZf8a6AtvDS6dF2IjaX7lDCH6QAmgO3QROqpsHY7Rwdz94fqGZ1q9yXEFxJ4GfSlf5tzZJF8kU4q2iVABYLK9eok0gkLA1DKukTzeURcR0OCLWLCAL3RJzgL8oSxHHExEWOBYOov61VOF9QHQ2i6wh/GV6HBwINmSwU/hzhcHOkjfx7x72x0r5K4JoYEiSUVsg13fEGYCZajNofdgmniMbkejna4l9hLTOGz6Qv6agfepSgStaxk9Wbk3Rjf1/al+mUL3BFEfo9WyEDPz6ZqLCAv/Bjv3jTVQhN/vShrM1PwPK42ijl1kUAcZB/OQS6UFWOLRB4k8ueDqANhw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector10001; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=t/mmpejhRGfbNBqMKMWTRaQ+cdwIZpTf/b0NZCtoRQo=; b=c3FCQndmkvkzPLZyOFTcE648wuYxrGzoOjgCMw+mOHaZVMaYJHcvwL6tjcnSHiPIeA1VgpYB+GPfBlIQLOsQD2O+t4O9kk7FN5AbLbWFPhzcTQLrKvH1Rl2/UFUiQNQhu1pE2vpySvwEHvcvBD5ptC+qrZwuPuRZJNTBlimEybZI6+oGeYiQq/P0r4clW5s+87RaQgf6N08OHrfD6M9HBxZsdfjuJ/jHecLy5uHXBuECYdTUKx5rMp6OoD09SqKOA7M+lIEwQIMUComJAlvq7W6LFwCvUPg/+0FhYD5nADQwOImgmGN2om8+qguH0a11IFkiPqlbG8xycKvYlfmw6w== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=temperror (sender ip is 165.204.84.17) smtp.rcpttodomain=kernel.org smtp.mailfrom=amd.com; dmarc=temperror action=none header.from=amd.com; dkim=none (message not signed); arc=none (0) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amd.com; s=selector1; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=t/mmpejhRGfbNBqMKMWTRaQ+cdwIZpTf/b0NZCtoRQo=; b=vlQRyn8qIQ0B9g0xuixYKYQav+WojF95UN3Hy98dlbTfUxvQI96PJGXKRAM9GBfRe7et8Schmf23tgbnIhO6MGW+qtyKVS8hS3nF5GXjcZxc7wLXjUqao4MPoJZm2sMVfkfjwCcptNgZOiqC+pYVXCaQyCDpbUYObYk8xFKmPqo= Received: from BN9PR03CA0232.namprd03.prod.outlook.com (2603:10b6:408:f8::27) by CH3PR12MB8233.namprd12.prod.outlook.com (2603:10b6:610:129::15) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.21.292.25; Wed, 12 Aug 2026 21:44:20 +0000 Received: from BL02EPF0001A105.namprd05.prod.outlook.com (2603:10b6:408:f8:cafe::3c) by BN9PR03CA0232.outlook.office365.com (2603:10b6:408:f8::27) with Microsoft SMTP Server (version=TLS1_3, cipher=TLS_AES_256_GCM_SHA384) id 15.21.315.12 via Frontend Transport; Wed, 12 Aug 2026 21:44:20 +0000 X-MS-Exchange-Authentication-Results: spf=temperror (sender IP is 165.204.84.17) smtp.mailfrom=amd.com; dkim=none (message not signed) header.d=none;dmarc=temperror action=none header.from=amd.com; Received-SPF: TempError (protection.outlook.com: error in processing during lookup of amd.com: DNS Timeout) Received: from satlexmb07.amd.com (165.204.84.17) by BL02EPF0001A105.mail.protection.outlook.com (10.167.241.137) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.21.315.6 via Frontend Transport; Wed, 12 Aug 2026 21:44:19 +0000 Received: from satlexmb07.amd.com (10.181.42.216) by satlexmb07.amd.com (10.181.42.216) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.45; Wed, 12 Aug 2026 16:44:19 -0500 Received: from xsjlizhih51.xilinx.com (10.180.168.240) by satlexmb07.amd.com (10.181.42.216) with Microsoft SMTP Server id 15.2.2562.45 via Frontend Transport; Wed, 12 Aug 2026 16:44:18 -0500 From: Lizhi Hou To: , , , , CC: Lizhi Hou , , , Subject: [PATCH V1] accel/amdxdna: Fix unexpected wait when flushing notifier_wq Date: Wed, 12 Aug 2026 14:44:03 -0700 Message-ID: <20260812214403.817307-1-lizhi.hou@amd.com> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BL02EPF0001A105:EE_|CH3PR12MB8233:EE_ X-MS-Office365-Filtering-Correlation-Id: 119af8f9-ff8f-48a6-380a-08def8badd87 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|82310400026|23010399003|376014|36860700016|18002099003|56012099006|11063799006|10067099003; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:165.204.84.17;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:satlexmb07.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230040)(1800799024)(82310400026)(23010399003)(376014)(36860700016)(18002099003)(56012099006)(11063799006)(10067099003);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: vQW3tuJYUMNEWLRwh9S1v3Qa+H5rISHV4rb3909xFjUn9Mbm82r7EzIpVeMQ/QeqnZHak4OCr325WJrGvXxwnJUWrUTp16eGrKedmxePn/VCthtK4ibV5Il75YXkQwEyva08JyovZ/iWnmda3j89/PfV2BqUg9fwdfjJqTKOyuaHx7wv5AhHThQTI2VWFJx5fJ3n/Umby1RagAUcu1VZ6rtAU338THLya5Pm85jLdqipuk5vhc4az0NLlGC+AbeV0n+P5DGX8iaFBBx59cZUIef9G8bMJSRL9O95p/Nl12zrHwEh6Zu6Eq6UEbsjEHBl/vK/3Wj2t+algYG7sj4aBhVxbduOHOEpKqL33XzU86YTkkKQcnGEa6ZMyAt/tyufzGaxIaseEPd5411Ythspthr9lqGu4H+0CYi4/g23fVU95IpWtrn7Xl/Yognr0W6M X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 12 Aug 2026 21:44:19.6976 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 119af8f9-ff8f-48a6-380a-08def8badd87 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[satlexmb07.amd.com] X-MS-Exchange-CrossTenant-AuthSource: BL02EPF0001A105.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CH3PR12MB8233 Content-Type: text/plain; charset="utf-8" In amdxdna_gem_obj_free(), flush_workqueue(xdna->notifier_wq) waits for all pending work items on the device-global notifier workqueue, rather than only the work items associated with the BO being freed. If another BO has a pending hmm_unreg_work, freeing an unrelated BO can be unnecessarily blocked until that work completes. mmu_interval_notifier_remove() is deferred to a workqueue because it cannot be called from the MMU notifier callback itself. The BO free path is not a notifier callback, so call mmu_interval_notifier_remove() directly there and avoid the workqueue. Fixes: e486147c912f ("accel/amdxdna: Add BO import and export") Signed-off-by: Lizhi Hou Reviewed-by: Max Zhen --- drivers/accel/amdxdna/amdxdna_gem.c | 60 +++++++++++++++++++---------- drivers/accel/amdxdna/amdxdna_gem.h | 1 + 2 files changed, 41 insertions(+), 20 deletions(-) diff --git a/drivers/accel/amdxdna/amdxdna_gem.c b/drivers/accel/amdxdna/am= dxdna_gem.c index 1c63eff0a4a8..d6aa862e2d5b 100644 --- a/drivers/accel/amdxdna/amdxdna_gem.c +++ b/drivers/accel/amdxdna/amdxdna_gem.c @@ -301,33 +301,40 @@ static void amdxdna_hmm_unregister(struct amdxdna_gem= _obj *abo, =20 down_write(&xdna->notifier_lock); list_for_each_entry(mapp, &abo->mem.umap_list, node) { - if (!vma || compare_range(mapp, vma->vm_mm, vma->vm_start, vma->vm_end))= { - if (!mapp->unmapped) { - queue_work(xdna->notifier_wq, &mapp->hmm_unreg_work); - mapp->unmapped =3D true; - } - if (vma) - break; - } + if (!compare_range(mapp, vma->vm_mm, vma->vm_start, vma->vm_end)) + continue; + + queue_work(xdna->notifier_wq, &mapp->hmm_unreg_work); + mapp->unmapped =3D true; } up_write(&xdna->notifier_lock); } =20 -static void amdxdna_umap_release(struct kref *ref) +static void amdxdna_hmm_unregister_all(struct amdxdna_gem_obj *abo) { - struct amdxdna_umap *mapp =3D container_of(ref, struct amdxdna_umap, refc= nt); - struct amdxdna_gem_obj *abo =3D mapp->abo; - struct amdxdna_dev *xdna; - - mmu_interval_notifier_remove(&mapp->notifier); + struct amdxdna_dev *xdna =3D to_xdna_dev(to_gobj(abo)->dev); + struct amdxdna_umap *mapp, *tmp; + LIST_HEAD(dead); =20 - xdna =3D to_xdna_dev(to_gobj(mapp->abo)->dev); down_write(&xdna->notifier_lock); - list_del(&mapp->node); - if (list_empty(&abo->mem.umap_list)) - abo->mem.uva =3D AMDXDNA_INVALID_ADDR; + list_for_each_entry_safe(mapp, tmp, &abo->mem.umap_list, node) { + mapp->unmapped =3D true; + mapp->cleanup =3D true; + list_move(&mapp->node, &dead); + } up_write(&xdna->notifier_lock); =20 + list_for_each_entry_safe(mapp, tmp, &dead, node) { + cancel_work_sync(&mapp->hmm_unreg_work); + amdxdna_umap_put(mapp); + } +} + +static void amdxdna_umap_release(struct kref *ref) +{ + struct amdxdna_umap *mapp =3D container_of(ref, struct amdxdna_umap, refc= nt); + + mmu_interval_notifier_remove(&mapp->notifier); kvfree(mapp->range.hmm_pfns); kfree(mapp); } @@ -341,6 +348,20 @@ static void amdxdna_hmm_unreg_work(struct work_struct = *work) { struct amdxdna_umap *mapp =3D container_of(work, struct amdxdna_umap, hmm_unreg_work); + struct amdxdna_gem_obj *abo =3D mapp->abo; + struct amdxdna_dev *xdna; + + xdna =3D to_xdna_dev(to_gobj(mapp->abo)->dev); + down_write(&xdna->notifier_lock); + if (mapp->cleanup) { + up_write(&xdna->notifier_lock); + return; + } + + list_del(&mapp->node); + if (list_empty(&abo->mem.umap_list)) + abo->mem.uva =3D AMDXDNA_INVALID_ADDR; + up_write(&xdna->notifier_lock); =20 amdxdna_umap_put(mapp); } @@ -643,8 +664,7 @@ static void amdxdna_gem_obj_free(struct drm_gem_object = *gobj) struct amdxdna_dev *xdna =3D to_xdna_dev(gobj->dev); struct amdxdna_gem_obj *abo =3D to_xdna_obj(gobj); =20 - amdxdna_hmm_unregister(abo, NULL); - flush_workqueue(xdna->notifier_wq); + amdxdna_hmm_unregister_all(abo); =20 if (abo->pinned) amdxdna_gem_unpin(abo); diff --git a/drivers/accel/amdxdna/amdxdna_gem.h b/drivers/accel/amdxdna/am= dxdna_gem.h index 1e90e32bf3cd..fb033ced1045 100644 --- a/drivers/accel/amdxdna/amdxdna_gem.h +++ b/drivers/accel/amdxdna/amdxdna_gem.h @@ -20,6 +20,7 @@ struct amdxdna_umap { struct kref refcnt; bool invalid; bool unmapped; + bool cleanup; }; =20 struct amdxdna_mem { --=20 2.34.1