From nobody Fri Apr 10 12:39:05 2026 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0AF2DECAAA1 for ; Tue, 6 Sep 2022 20:19:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230357AbiIFUT4 (ORCPT ); Tue, 6 Sep 2022 16:19:56 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53158 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231240AbiIFUTe (ORCPT ); Tue, 6 Sep 2022 16:19:34 -0400 Received: from mga04.intel.com (mga04.intel.com [192.55.52.120]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id EF26F646E for ; Tue, 6 Sep 2022 13:17:08 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1662495428; x=1694031428; h=from:to:cc:subject:date:message-id:in-reply-to: references:content-transfer-encoding:mime-version; bh=sbKfQTg+CFMo3FiMihv9YnajB9h+ql7gf2rY835FJg0=; b=MeX+pEnh9lQ9R52/38dMgFRVVOzYhoZC2CeVAMMoen+8AqRfzLALhoyi Ia3tLdlweayygU9E6ABp+UgyxBUVMAbwM0/nuJDwyHBDaMLtU/olIyRKJ aCC2TE2xB9siadpVsN02vo6qD+J8h4vFuYfeiSIMVHbgW2NgBcYP1dCJO 9L4swSKiKSIeBtXXx/WvcvhyPKWe2rIqjJbSKTKKAJkCjkmiXr1GPPjpB COijN/StCQse5jQJMkw193IMGlCjhVhCEmtPcLGSqHRJ02i27Ou7yYm4T C8JhcgW5GVpUKvdrtHQmjIWJTmWH2MXA3+y9I2lqv4RcR8x+bEPLV6/KQ A==; X-IronPort-AV: E=McAfee;i="6500,9779,10462"; a="295429529" X-IronPort-AV: E=Sophos;i="5.93,294,1654585200"; d="scan'208";a="295429529" Received: from orsmga007.jf.intel.com ([10.7.209.58]) by fmsmga104.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 06 Sep 2022 13:17:08 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.93,294,1654585200"; d="scan'208";a="610076379" Received: from orsmsx601.amr.corp.intel.com ([10.22.229.14]) by orsmga007.jf.intel.com with ESMTP; 06 Sep 2022 13:17:07 -0700 Received: from orsmsx603.amr.corp.intel.com (10.22.229.16) by ORSMSX601.amr.corp.intel.com (10.22.229.14) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.31; Tue, 6 Sep 2022 13:17:07 -0700 Received: from ORSEDG602.ED.cps.intel.com (10.7.248.7) by orsmsx603.amr.corp.intel.com (10.22.229.16) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.31 via Frontend Transport; Tue, 6 Sep 2022 13:17:06 -0700 Received: from NAM10-MW2-obe.outbound.protection.outlook.com (104.47.55.109) by edgegateway.intel.com (134.134.137.103) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.1.2375.31; Tue, 6 Sep 2022 13:17:05 -0700 ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=FCBn+AoGF39gpxOtZ+N+GJD+X8I6PVRd9Pn/O+ZnXQyA5zI0aw9olIepRRaU/p83+L8e+RNLWjvWoRWztbG2nVwb5690QppOxy1/xLFe1vaPR2kHOJ8aP0YjGz1PApM2VIbqYC7W5+n8pxWHaJVuRQSixkeAPOaYFu4WNVJHXbkUyAkb+wZKMOgV0j2O0RBo6iRnGvbY7s6FtjTYa40/22Dbhe9qPe5eQdxF/aUotFfbucu2951SX9tjoMhRWrhMPHY9sRNbxHkwdIxVPMTTebF9vUctTKkMuooZ9109LpatSkW8zXdkVh/f5nla9xvwxjKlu1JirMbfIJnDpKll/w== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; 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=Os1VZYkjqlvvGr86DKSKUwsxFEaQ4MP+zgd8BGaa3do=; b=Li0RRzu+GxP4onMcHgj8vwXs6Q2STyi704tsBQQ5VeExu7GWaa17cP96Hqr76hRH1OMEx+IMdDj7QeFVF1a52icOrTya44rVpYUEMdz/kWUK9Z413Fsd3VJZrArCOxXtB+wb5Hb4FKrHjzKlOXD/agYGumkbcpvofeAoHpo9VZYQBGPmCR91YhY62JIenuftsuX5or15IjcS4lDjru9EQm2h9165U+rUUmwMpE0EoqQXgK0ueIXdJaSqaUQHm+fMtRHjSdtrrVN6dAG7N5/yGIz3bG1d2Dwa0Mv1nnBZxPUywj73O0T9sNSOMHBXGZj55zlYBmnggKNYD7f1two9lw== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=intel.com; dmarc=pass action=none header.from=intel.com; dkim=pass header.d=intel.com; arc=none Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=intel.com; Received: from DM4PR11MB5373.namprd11.prod.outlook.com (2603:10b6:5:394::7) by CH0PR11MB5396.namprd11.prod.outlook.com (2603:10b6:610:bb::20) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.5588.12; Tue, 6 Sep 2022 20:17:04 +0000 Received: from DM4PR11MB5373.namprd11.prod.outlook.com ([fe80::b04c:807c:4ea0:c62e]) by DM4PR11MB5373.namprd11.prod.outlook.com ([fe80::b04c:807c:4ea0:c62e%9]) with mapi id 15.20.5588.018; Tue, 6 Sep 2022 20:17:04 +0000 From: =?UTF-8?q?Micha=C5=82=20Winiarski?= To: , , CC: David Airlie , Daniel Vetter , "Maarten Lankhorst" , Maxime Ripard , Thomas Zimmermann , Simon Ser , Matthew Wilcox , =?UTF-8?q?Micha=C5=82=20Winiarski?= Subject: [PATCH v4 1/3] drm: Use XArray instead of IDR for minors Date: Tue, 6 Sep 2022 22:16:27 +0200 Message-ID: <20220906201629.419160-2-michal.winiarski@intel.com> X-Mailer: git-send-email 2.37.1 In-Reply-To: <20220906201629.419160-1-michal.winiarski@intel.com> References: <20220906201629.419160-1-michal.winiarski@intel.com> Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: FR3P281CA0121.DEUP281.PROD.OUTLOOK.COM (2603:10a6:d10:94::8) To DM4PR11MB5373.namprd11.prod.outlook.com (2603:10b6:5:394::7) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 972bfaa2-37df-47e1-f1a7-08da9044c383 X-MS-TrafficTypeDiagnostic: CH0PR11MB5396:EE_ X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:DM4PR11MB5373.namprd11.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230016)(376002)(396003)(346002)(136003)(39860400002)(366004)(316002)(54906003)(86362001)(82960400001)(36756003)(2906002)(38100700002)(5660300002)(8936002)(7416002)(66946007)(4326008)(66476007)(83380400001)(8676002)(6512007)(6486002)(2616005)(6666004)(186003)(1076003)(6506007)(478600001)(66556008)(41300700001)(26005);DIR:OUT;SFP:1102; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?utf-8?B?MzZNbXJnVmNyZVJmTDFzYWl6d0syRDVxY0RhVnQwWjM4VkMvSFl4SHRrUmJl?= =?utf-8?B?dDR3dUZJekVsWEVnWEYyYVVGcHR1dDdCdVNsbndYRWYwQlV6Rjl3M3BuYjRz?= =?utf-8?B?ZUQyMDhWSTRQWENqa1RkVEZwVUdpTW5mejNUeWxGQ1NXTmVPZU1kUjZycjdO?= =?utf-8?B?NDZ0dUEwNnB0NnQ4cmtHVWtMNHp2Skl5REVkT1ZHNkdPVUJSS1hGVnNuNTBi?= =?utf-8?B?b1VmWjNJaUQ4RzRpb1NtVFltMk8zY09pL0x5OUhrZDVCbjVLaVRFUGVPSENV?= =?utf-8?B?WFJSR1cvcEFabDFqbnJWb3NydStkbnVNSzVhN1M0TmlYdnpFVGlqYmFYUlZx?= =?utf-8?B?M0hscGo5OFhxRVZIeDU4eUNweWlOMWZEOUh5d2REMndENzJoZXdMVHVZc1dV?= =?utf-8?B?bG9WNUVZWFZVTHVWZG1WMDFQRzYrT3h5c0x1N251VjBqVzBDbWhXb240OThu?= =?utf-8?B?cE5CSkJRa3Q5SUZ5SHZXWDBpbnNLN3licU1UdC9KWU85NThTeDIwbldOQlND?= =?utf-8?B?YnFDSXdkRkpjTHRDVXZXZWJueFdxZEh5TEVsWWNIT3YwbmQ2M0NGc0tXdlFm?= =?utf-8?B?VHlkRi9hcG9NSjRxY29EdmY5ZENpNDVVYmYzVDlkRnpuOHJ2OXJRbjhBWjNj?= =?utf-8?B?K0ZNam1RV1hqQ0lvWW5VR1Z1bmlQY1lnb2RqQW5PQ1FRdHpTOWh1K2JRd1Nn?= =?utf-8?B?NkdxWGI1NjVwWkk3alVObTlQbXdKeTBXc2dZV0p5N1Z3OXBWWmpoLzdzWWM5?= =?utf-8?B?bHVPYzZNWUNYS2tUZlJhOTh0cHV5elZuSTFRaTFBemVaRm44OUpuNWZVYlN4?= =?utf-8?B?eU9mZkI1K3pYT09JdUIvSGhCcmYrb2hnZm16TVdyTEVGQ21MMXpOdkpvZWpI?= =?utf-8?B?SHZNcElOM1JpakpRaE51K2NHUE5kQTNFdkt3Mk5BWmFiUWZ6VjBuN001dXFD?= =?utf-8?B?MkJFcWxTd2pjdGJBMXBoanFXNFJPaVl4bEI0WWcvYzZOK3B1bEVzbVB0VG4w?= =?utf-8?B?dGRjNkhPUStiZ3B4UUR2MjhpYnRYK0JUZGZLSnVwYnh5QzVWbHVMRWZqL0I4?= =?utf-8?B?bTd5T3JQZllPenhsK3hwY2JsWENtdUhPRHorZS9Oc0hRcnVLVlBkSmRWMjhT?= =?utf-8?B?Y3dDQSswa1V1dndtRW85aEZOdGRIRE1mQUpGOFJJcjltZkRiSXF0V3Fqb3pS?= =?utf-8?B?dlhJanZzeXJZeGxmS1lNdy96NE45OWxmRHFpNXI2d2wrZVltUndIRHp5NVhZ?= =?utf-8?B?ZGZNVUZkdDhhdERFYXVuY3k5M3JnY3pHaE0waWluN3NJRHhMRjRpRExselk5?= =?utf-8?B?UFYxc3UvcmdsNnh0aDhjbE1sRmlVSi9ybjZiblpDbDMzZzgwaG51VlNJL1JO?= =?utf-8?B?RENETmVZbmEzcE9MTEIrdDVCUk5NS1dqN3hXTVRlaEo5WFVBS2ZTQWU2NXh0?= =?utf-8?B?ejVGaVBVdEljM3N2UkgrVHRaSHJ0NDRWRmluZVRsWXYwYmtJVEhpT1lBYkhZ?= =?utf-8?B?ODIyQjk5eXZSeW5CaHhHOHZKSEtsM0lENDJlY20wZWpoOEFJSm5KaVhxNEJj?= =?utf-8?B?VlBEMGNmbnBlc1JuTjFkTFA4cVBoa1NRWXh4aXRoSkMzZ2RQTzRYbEhLRito?= =?utf-8?B?b0huNHBnLzlCTlFJcURVSGpYSzdzaFZZeG1WZURFeVExUHJzWkFqS1daQlMy?= =?utf-8?B?UCtBYmROcHcwKy9ZcTVyckhGSVZtY2NzYlI1RlA2WS80KzBNVnphVExkWlJn?= =?utf-8?B?S0tJTVdNVG40eW9jZVpMQTg1UHQwVUd6eGlsTzlNbGxjRGpkSlVQR2Z0YU1w?= =?utf-8?B?OWNiNTNhckhFSXRxZDVjZVowT3A1ejZBSk1aWFAvNHhXZUtUelFjbEZVUkc1?= =?utf-8?B?Q2pXQzZqeHdRbitCd2krY1hQMHF3T3pOTVdtTGFWNmVTUGEwUmlUSGV6a2FU?= =?utf-8?B?T05jRXYvRTBJK243UGdXaStKdjI1cm5IK05MeVdLKzNVdFlMQk00Rk5zTldV?= =?utf-8?B?RXhpQjRndEZRVERwTlFxcndoN0tnYXQ3SnlUSk9YTlJweFVkRVluTVJGajd2?= =?utf-8?B?VXFHdytDQzVvZ0JNYkNxYnRzTVNPZm5wK2tXVk9vSktZMkJubnZRdmI4dzZ4?= =?utf-8?B?S2lGZEtnUzFjdG14ZzlXUmU2QSs0bnNpbnE4Q05FOTZFN0VHcWxSOVkrMUVN?= =?utf-8?B?dVE9PQ==?= X-MS-Exchange-CrossTenant-Network-Message-Id: 972bfaa2-37df-47e1-f1a7-08da9044c383 X-MS-Exchange-CrossTenant-AuthSource: DM4PR11MB5373.namprd11.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 06 Sep 2022 20:17:04.1069 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 46c98d88-e344-4ed4-8496-4ed7712e255d X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: hAUHbuah5dWnGGWtMWAW6MdOQWAoOLnppcnpXoNG7XIr+jTWXZjZtjkzMmZDg0XTWRWbttP4OWLzsY4Fm6ksVMdYpzrNwBVs5RDckeOgwLY= X-MS-Exchange-Transport-CrossTenantHeadersStamped: CH0PR11MB5396 X-OriginatorOrg: intel.com Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org IDR is deprecated, and since XArray manages its own state with internal locking, it simplifies the locking on DRM side. Additionally, don't use the IRQ-safe variant, since operating on drm minor is not done in IRQ context. Signed-off-by: Micha=C5=82 Winiarski Suggested-by: Matthew Wilcox --- drivers/gpu/drm/drm_drv.c | 49 ++++++++++++++------------------------- 1 file changed, 17 insertions(+), 32 deletions(-) diff --git a/drivers/gpu/drm/drm_drv.c b/drivers/gpu/drm/drm_drv.c index 8214a0b1ab7f..41799e4d0432 100644 --- a/drivers/gpu/drm/drm_drv.c +++ b/drivers/gpu/drm/drm_drv.c @@ -34,6 +34,7 @@ #include #include #include +#include =20 #include #include @@ -53,8 +54,7 @@ MODULE_AUTHOR("Gareth Hughes, Leif Delgass, Jos=C3=A9 Fon= seca, Jon Smirl"); MODULE_DESCRIPTION("DRM shared core routines"); MODULE_LICENSE("GPL and additional rights"); =20 -static DEFINE_SPINLOCK(drm_minor_lock); -static struct idr drm_minors_idr; +static DEFINE_XARRAY_ALLOC(drm_minors_xa); =20 /* * If the drm core fails to init for whatever reason, @@ -98,21 +98,18 @@ static struct drm_minor **drm_minor_get_slot(struct drm= _device *dev, static void drm_minor_alloc_release(struct drm_device *dev, void *data) { struct drm_minor *minor =3D data; - unsigned long flags; =20 WARN_ON(dev !=3D minor->dev); =20 put_device(minor->kdev); =20 - spin_lock_irqsave(&drm_minor_lock, flags); - idr_remove(&drm_minors_idr, minor->index); - spin_unlock_irqrestore(&drm_minor_lock, flags); + xa_release(&drm_minors_xa, minor->index); } =20 static int drm_minor_alloc(struct drm_device *dev, unsigned int type) { struct drm_minor *minor; - unsigned long flags; + u32 id; int r; =20 minor =3D drmm_kzalloc(dev, sizeof(*minor), GFP_KERNEL); @@ -122,20 +119,12 @@ static int drm_minor_alloc(struct drm_device *dev, un= signed int type) minor->type =3D type; minor->dev =3D dev; =20 - idr_preload(GFP_KERNEL); - spin_lock_irqsave(&drm_minor_lock, flags); - r =3D idr_alloc(&drm_minors_idr, - NULL, - 64 * type, - 64 * (type + 1), - GFP_NOWAIT); - spin_unlock_irqrestore(&drm_minor_lock, flags); - idr_preload_end(); - + r =3D xa_alloc(&drm_minors_xa, &id, NULL, + XA_LIMIT(64 * type, 64 * (type + 1) - 1), GFP_KERNEL); if (r < 0) return r; =20 - minor->index =3D r; + minor->index =3D id; =20 r =3D drmm_add_action_or_reset(dev, drm_minor_alloc_release, minor); if (r) @@ -152,7 +141,7 @@ static int drm_minor_alloc(struct drm_device *dev, unsi= gned int type) static int drm_minor_register(struct drm_device *dev, unsigned int type) { struct drm_minor *minor; - unsigned long flags; + void *entry; int ret; =20 DRM_DEBUG("\n"); @@ -172,9 +161,12 @@ static int drm_minor_register(struct drm_device *dev, = unsigned int type) goto err_debugfs; =20 /* replace NULL with @minor so lookups will succeed from now on */ - spin_lock_irqsave(&drm_minor_lock, flags); - idr_replace(&drm_minors_idr, minor, minor->index); - spin_unlock_irqrestore(&drm_minor_lock, flags); + entry =3D xa_store(&drm_minors_xa, minor->index, &minor, GFP_KERNEL); + if (xa_is_err(entry)) { + ret =3D xa_err(entry); + goto err_debugfs; + } + WARN_ON(entry); =20 DRM_DEBUG("new minor registered %d\n", minor->index); return 0; @@ -187,16 +179,13 @@ static int drm_minor_register(struct drm_device *dev,= unsigned int type) static void drm_minor_unregister(struct drm_device *dev, unsigned int type) { struct drm_minor *minor; - unsigned long flags; =20 minor =3D *drm_minor_get_slot(dev, type); if (!minor || !device_is_registered(minor->kdev)) return; =20 /* replace @minor with NULL so lookups will fail from now on */ - spin_lock_irqsave(&drm_minor_lock, flags); - idr_replace(&drm_minors_idr, NULL, minor->index); - spin_unlock_irqrestore(&drm_minor_lock, flags); + xa_erase(&drm_minors_xa, minor->index); =20 device_del(minor->kdev); dev_set_drvdata(minor->kdev, NULL); /* safety belt */ @@ -215,13 +204,10 @@ static void drm_minor_unregister(struct drm_device *d= ev, unsigned int type) struct drm_minor *drm_minor_acquire(unsigned int minor_id) { struct drm_minor *minor; - unsigned long flags; =20 - spin_lock_irqsave(&drm_minor_lock, flags); - minor =3D idr_find(&drm_minors_idr, minor_id); + minor =3D xa_load(&drm_minors_xa, minor_id); if (minor) drm_dev_get(minor->dev); - spin_unlock_irqrestore(&drm_minor_lock, flags); =20 if (!minor) { return ERR_PTR(-ENODEV); @@ -1037,7 +1023,7 @@ static void drm_core_exit(void) unregister_chrdev(DRM_MAJOR, "drm"); debugfs_remove(drm_debugfs_root); drm_sysfs_destroy(); - idr_destroy(&drm_minors_idr); + xa_destroy(&drm_minors_xa); drm_connector_ida_destroy(); } =20 @@ -1046,7 +1032,6 @@ static int __init drm_core_init(void) int ret; =20 drm_connector_ida_init(); - idr_init(&drm_minors_idr); drm_memcpy_init_early(); =20 ret =3D drm_sysfs_init(); --=20 2.37.3 From nobody Fri Apr 10 12:39:05 2026 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4B2B4C38145 for ; Tue, 6 Sep 2022 20:20:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231243AbiIFUUH (ORCPT ); Tue, 6 Sep 2022 16:20:07 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60102 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230426AbiIFUTm (ORCPT ); Tue, 6 Sep 2022 16:19:42 -0400 Received: from mga07.intel.com (mga07.intel.com [134.134.136.100]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3DE575722E for ; Tue, 6 Sep 2022 13:17:25 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1662495445; x=1694031445; h=from:to:cc:subject:date:message-id:in-reply-to: references:content-transfer-encoding:mime-version; bh=iK6yPR25uATbMq3cTWOhf01aAfkZS5uJ1mbTY5RiIY8=; b=dTURxW1C872bVWW1KJNPo5IZTh/xpoxxyZw+/7SmszyPuabnJILk1twA XdoRqtBAL1gIPJPCgH3fCEfxh6hv3iVO2DsBoL20fHv+zt5cKwG5TG5Es utr754JHXnNgxTckj61vnGwe2ek7O+8o3kQGaXCyEHQvoKLm+j/hgBEpY CiS8j3q5uqQ+5D8lkaZJfpmOW5kD3nwLPZ1grDXkcczU4A74qBVT4J0an /TKhuSxtyBpbACP5Wc7Rpie5PN6nCAeYuV4rQDBntFTl+7HUJMneoTkCk //PrfjZ+gFtrDhJ5vh+Si6bZb1U64qUqKCEbUasNsuqY9xXXk3jT05537 w==; X-IronPort-AV: E=McAfee;i="6500,9779,10462"; a="360642854" X-IronPort-AV: E=Sophos;i="5.93,294,1654585200"; d="scan'208";a="360642854" Received: from orsmga008.jf.intel.com ([10.7.209.65]) by orsmga105.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 06 Sep 2022 13:17:12 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.93,294,1654585200"; d="scan'208";a="644310318" Received: from fmsmsx601.amr.corp.intel.com ([10.18.126.81]) by orsmga008.jf.intel.com with ESMTP; 06 Sep 2022 13:17:11 -0700 Received: from fmsmsx608.amr.corp.intel.com (10.18.126.88) by fmsmsx601.amr.corp.intel.com (10.18.126.81) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.31; Tue, 6 Sep 2022 13:17:11 -0700 Received: from FMSEDG603.ED.cps.intel.com (10.1.192.133) by fmsmsx608.amr.corp.intel.com (10.18.126.88) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.31 via Frontend Transport; Tue, 6 Sep 2022 13:17:11 -0700 Received: from NAM10-MW2-obe.outbound.protection.outlook.com (104.47.55.101) by edgegateway.intel.com (192.55.55.68) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.1.2375.31; Tue, 6 Sep 2022 13:17:10 -0700 ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=Vmr4KAVsCQF0K86gc1O8Kp5BovAJhu3VQBcRnc2YGqS8gX23ASLCztSW9vPJyBIub+lAqVzLuWFc90iyxd4Gfa2wzjUsXb6ZLIBQUmZxndTbn5TnROxNOBKHJpvXmOViISl7GK9rWb4Bb9PT0aNdLEuHDm+5KfQqLqWMbHvsZyYuohLYlD3+7rvAfLLdJjwDOadITYCts6CJBWrtGN7BR2NJrVisGS3ZAHsN500cfEplFbXYdGBoRaF+B+uD9Vm7HPldYGXvYeUH/wL6rf4UoWsiYX2hRNdPIeHMnQQgviStkdDjPuGKBGx8ErFH4tEGCewy7M1BEeZJlK4dnG6xVQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; 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=jNpp4W7B+QMMucoL1cm/W+GrHno4Qa9i5upw4eTjxa8=; b=Q/eUAxI6E2qniOTe/SnFVmG7k2xxNJGJA5DCKBTpnQzNg0P+1PtWK90QQvwxmGGxBo2WhUXZidbVXoJNHGRJQBkAl68AGptASpgvdfA0O+9VS3aW51azWREum9wK8sulVPWEokJ3wpPaJsjEZJSfpvAZu25FnjfMmt1/6mCn/N6I2jIPKrcvMR8WGKH9mtyKBzvkC9tqOr0eAQbRdFVhCm8K5tWG8GkoiJjKj9PzpUffkQe9kCLPyUUfLPkrgUbfM/VAgiLd0Zg5Yfo6pP9n9iV1yt1CYt8V8Uad9Obgy40qgbf3ykeFginuc8k6VImL4i4EtDnbjgktNQY4sIwuGw== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=intel.com; dmarc=pass action=none header.from=intel.com; dkim=pass header.d=intel.com; arc=none Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=intel.com; Received: from DM4PR11MB5373.namprd11.prod.outlook.com (2603:10b6:5:394::7) by CH0PR11MB5396.namprd11.prod.outlook.com (2603:10b6:610:bb::20) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.5588.12; Tue, 6 Sep 2022 20:17:08 +0000 Received: from DM4PR11MB5373.namprd11.prod.outlook.com ([fe80::b04c:807c:4ea0:c62e]) by DM4PR11MB5373.namprd11.prod.outlook.com ([fe80::b04c:807c:4ea0:c62e%9]) with mapi id 15.20.5588.018; Tue, 6 Sep 2022 20:17:08 +0000 From: =?UTF-8?q?Micha=C5=82=20Winiarski?= To: , , CC: David Airlie , Daniel Vetter , "Maarten Lankhorst" , Maxime Ripard , Thomas Zimmermann , Simon Ser , Matthew Wilcox , =?UTF-8?q?Micha=C5=82=20Winiarski?= Subject: [PATCH v4 2/3] drm: Expand max DRM device number to full MINORBITS Date: Tue, 6 Sep 2022 22:16:28 +0200 Message-ID: <20220906201629.419160-3-michal.winiarski@intel.com> X-Mailer: git-send-email 2.37.1 In-Reply-To: <20220906201629.419160-1-michal.winiarski@intel.com> References: <20220906201629.419160-1-michal.winiarski@intel.com> Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: FR3P281CA0104.DEUP281.PROD.OUTLOOK.COM (2603:10a6:d10:a1::20) To DM4PR11MB5373.namprd11.prod.outlook.com (2603:10b6:5:394::7) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: b7766d86-eaa8-4c91-e8d8-08da9044c664 X-MS-TrafficTypeDiagnostic: CH0PR11MB5396:EE_ X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:DM4PR11MB5373.namprd11.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230016)(376002)(396003)(346002)(136003)(39860400002)(366004)(316002)(54906003)(86362001)(82960400001)(36756003)(2906002)(38100700002)(5660300002)(8936002)(7416002)(66946007)(4326008)(66476007)(83380400001)(8676002)(6512007)(6486002)(2616005)(6666004)(186003)(1076003)(6506007)(478600001)(66556008)(41300700001)(26005);DIR:OUT;SFP:1102; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?utf-8?B?MGFJVDZnS0FmV2VHc0hLQTZuOGVxa2ovWWJ6UzVvNmNIcHlOdFpxWHhBQzZ3?= =?utf-8?B?bWZGQTVQc1pHTmxCcnBrcDdab2pvK2J5Zkd4WVVnbjIxaGp4WUVVbEp6RWxy?= =?utf-8?B?cmU1TzNRbk9JazZQSnVPVG1yUDc4dXJkdytWTnE1UWFrdTFOM0xNVzRrLzFM?= =?utf-8?B?MytwamxqRFJDMFBZM2t5dDluanNldDRzbGhVdXdXN05FSHl2L2cyR29rRWlo?= =?utf-8?B?ZTF4VEs2WlJjdnhtcmFLd0NDRm9NY1lUU0JGNzdpdmR0RDhYb2hzOGE0TXpG?= =?utf-8?B?eWhKQTMwSmg4cGVIYzJlVkJvV09GNEx6VlhBUm5EaWZrdnM2aTl2SjBDQXJn?= =?utf-8?B?WkdaRzFPd1hRZjdKU002aXFiSDFaUW5DZS9GS21vb1d2VXpGOSt3dFhTVkt3?= =?utf-8?B?bUJlbTJ6S0t0ZjhVVnF5WXNxaU5TRFJNUVpkTitROUVJb0pLL2llYnZiczNi?= =?utf-8?B?S2YzMm1NSlFZTmozdy9pNTdybU1FdFRDZCtqWFpQbnpJYnZ0TmxFNWtRcGdv?= =?utf-8?B?UDRYUEtiSkZiZDlhSWMweGpzdVlkaS9BRmtxMW9aSHVISW9oNU56N3pzVkZO?= =?utf-8?B?RSt4M3VSMFdPK2NnUllzYUE0VW4wVkRQeStzQ0NHVG9kbHJvMHIraCtKS2Jj?= =?utf-8?B?czFqU2I5S3hxR1JWWC8zOVRqaXg0TkxqbzcwcUVvMWNLeDNubk1TeEVuSmp3?= =?utf-8?B?WW1xa3l3OEFNbEg1bGJkdUlDc3hZUUNQNU9VWTJVWnRVVytSMzd0RkMwdzVN?= =?utf-8?B?c3dXT2JDL25rdkdDSWRNbk4wbVBTQVMwVHJNNEYwM2IwbW5SeXQxcHUrekZs?= =?utf-8?B?QjJwVmVvRi84QU91WkFQZDJjakI2dy83bnVUcEdmTWZWQjlHMmRrT3o1K0cz?= =?utf-8?B?VS9YRWxsREhqS1VGTnpCWW10ZVhzaEFNd3ZneXppdVdtSlhyMG5NbXlLV1Rv?= =?utf-8?B?Z3Ryby9yaFE1Z3hObW1ISVJ4d3dKSU1lSDJpdTBKdXVBVEIwUHgwVlhFNFRn?= =?utf-8?B?NEl2bDdXbDNidDE4dVB3RmZ6NzZxV0cxRVMwTXhQYmRNOEFvRWxjU2VyZ0pt?= =?utf-8?B?WXJ5OFp4b2JHOWxSakhJZ0p6N1lUVEJjMWNSK0VSeWdxS3ZKVWRsazFPcXpi?= =?utf-8?B?TWRmR2cxS0FmOWRZQVBVOWhFSzU0OEI2dVRtd05XNDZHRjZrRE1aV090cUVL?= =?utf-8?B?RnJCVXZSYUNXcGxiUG9SamRrS0RUNTZxSzZQSlhQN1kxdE1OaDNoMkJzSFlL?= =?utf-8?B?emU3U3ppRGlVQWd5bTgxNUxaUGl4NkVXYjlzUEFkMVNRR1RndGFqN3JoYkNs?= =?utf-8?B?c3pKelNDRlJOekp5aGJIelhtTytwaDUrcExHZU5nTmg5dXZBbzJEeUZvUjlM?= =?utf-8?B?dEdCbzZEckNyYWtMNnNpK0FtRFJEU0h2S3pHa2w3WXJkWmJSV3d5aVhHSDls?= =?utf-8?B?QzdWZy9NWFJhQkxzRVEwSitac2o0dUJNanFONFhiVFR1a2QvV3BGMXp1WFhP?= =?utf-8?B?WkpBOENKdG1LdDlVbWkxUjRyTlM0aDBrL29OZ0taR0ZNSXVNY2FzdDNjeWNu?= =?utf-8?B?dWRhK25oZGlzN2NWU00vSmlzTS81SURxMjlKZjdDamtBOWZTaDhnSWtEbkQ2?= =?utf-8?B?REhMUmZ5YklzQXQxT3paT1B0Y08zN0cxb0sxM0pSUnppV3pEWkNwVnVQeW85?= =?utf-8?B?WWFPblNTZGVFdk40YVh0Rk9lUkdkVGw0YnhKTm8xWlFETEFjZmVEdER5VllM?= =?utf-8?B?ViticzVsRlhsWGU0OFpQaWZYMVBFU0VKenpLbUJPdGdSV3Z3NGcxTSszUmF3?= =?utf-8?B?bTRUeWZXWExBUGw3NUJhbWorY3JOaDlsMnBSZnRVYVBFdjB5Y0lOTlhORXN0?= =?utf-8?B?YkNIc1M4TUN5Tk5FQ3J6dmNKejNFcmRReVVPU2NsZno1UnBON2tZeTZzNkpk?= =?utf-8?B?QXVyTmpuVklZZDAxV3RDMW1SUEtZZnhyYTFMMllaaVJHaC90djVlU256cVh2?= =?utf-8?B?N1hHcFhBN3BDay9CRmNEY2dlTkUrTm0rcUZ3MHZxN3lvbENNWmpkeENyRjNZ?= =?utf-8?B?Wk1lWVR4RGE2Vk1sK1ZIVUhUTlNQZ0gxdjRRSHMxVHhVSVNzS3pkWENmMmpQ?= =?utf-8?B?c0RnMGc0NHNNUDFtZG9Pdks5QUJDcWgrT2ZWdTVRclQrNVNuVmxqVjdKRFli?= =?utf-8?B?Rmc9PQ==?= X-MS-Exchange-CrossTenant-Network-Message-Id: b7766d86-eaa8-4c91-e8d8-08da9044c664 X-MS-Exchange-CrossTenant-AuthSource: DM4PR11MB5373.namprd11.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 06 Sep 2022 20:17:08.8274 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 46c98d88-e344-4ed4-8496-4ed7712e255d X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: CdEI5dOPnaXmGTrjwQEVdOH7gZHr58tqC7wdmp+9uRVzmb5dZe1ZMuckcl+nb2H5z8pMJO73TlD6ZDdqvXqK4UwcjIUvAymhs7kO/gaQK0M= X-MS-Exchange-Transport-CrossTenantHeadersStamped: CH0PR11MB5396 X-OriginatorOrg: intel.com Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Having a limit of 64 DRM devices is not good enough for modern world where we have multi-GPU servers, SR-IOV virtual functions and virtual devices used for testing. Let's utilize full minor range for DRM devices. To avoid regressing the existing userspace, we're still maintaining the numbering scheme where 0-63 is used for primary, 64-127 is reserved (formerly for control) and 128-191 is used for render. For minors >=3D 192, we're allocating minors dynamically on a first-come, first-served basis. Signed-off-by: Micha=C5=82 Winiarski --- drivers/gpu/drm/drm_drv.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/drivers/gpu/drm/drm_drv.c b/drivers/gpu/drm/drm_drv.c index 41799e4d0432..2c6e0b8d3b7a 100644 --- a/drivers/gpu/drm/drm_drv.c +++ b/drivers/gpu/drm/drm_drv.c @@ -119,8 +119,17 @@ static int drm_minor_alloc(struct drm_device *dev, uns= igned int type) minor->type =3D type; minor->dev =3D dev; =20 + /* + * DRM used to support 64 devices, for backwards compatibility we need to= maintain the + * minor allocation scheme where minors 0-63 are primary nodes, 64-127 ar= e control nodes, + * and 128-191 are render nodes. + * After reaching the limit, we're allocating minors dynamically - first-= come, first-serve. + */ r =3D xa_alloc(&drm_minors_xa, &id, NULL, XA_LIMIT(64 * type, 64 * (type + 1) - 1), GFP_KERNEL); + if (r =3D=3D -EBUSY) + r =3D xa_alloc(&drm_minors_xa, &id, NULL, + XA_LIMIT(192, (1 << MINORBITS) - 1), GFP_KERNEL); if (r < 0) return r; =20 --=20 2.37.3 From nobody Fri Apr 10 12:39:05 2026 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3EA20C38145 for ; Tue, 6 Sep 2022 20:20:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230511AbiIFUUU (ORCPT ); Tue, 6 Sep 2022 16:20:20 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60094 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230434AbiIFUTm (ORCPT ); Tue, 6 Sep 2022 16:19:42 -0400 Received: from mga06.intel.com (mga06b.intel.com [134.134.136.31]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id EE07D6EF04 for ; Tue, 6 Sep 2022 13:17:24 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1662495444; x=1694031444; h=from:to:cc:subject:date:message-id:in-reply-to: references:content-transfer-encoding:mime-version; bh=+1+LnVzmjZLuT4xn8PzW65yv0ZishEmy63sB8z50MY0=; b=DQqHY7BeUcU23FTuiYrU+w5YMQz9f9pNA0Y8ilasMjhEyd9qwG58/T9s J/DdA+5VLNMHtHLLI3S4wrdL1ZKDm9CBN+FBg+17XGpNr8vT+xFV4uDNT Rlx9xm2dmYcpoiFh5YLJfR3c3BBKk0QsDzwDSg2XtIwxMcMYjZkYV0D5M G0EDV9aMISVh2dksxWG7fqJoGSXnVsspHWhJOINubDLDczTJakvdMRZuW KXhTAm20foFvigy/ca1uOB+oBeHwHxKLxtiCu+jA81vwwnJsSnOYh7mcz MWt6boQ452vDBTnRFZuH0RndBZZJZCs2tOQyj8Muy3Mj7Cf/xoJY2dcC3 Q==; X-IronPort-AV: E=McAfee;i="6500,9779,10462"; a="358411754" X-IronPort-AV: E=Sophos;i="5.93,294,1654585200"; d="scan'208";a="358411754" Received: from orsmga007.jf.intel.com ([10.7.209.58]) by orsmga104.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 06 Sep 2022 13:17:21 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.93,294,1654585200"; d="scan'208";a="610076412" Received: from orsmsx601.amr.corp.intel.com ([10.22.229.14]) by orsmga007.jf.intel.com with ESMTP; 06 Sep 2022 13:17:17 -0700 Received: from orsmsx611.amr.corp.intel.com (10.22.229.24) by ORSMSX601.amr.corp.intel.com (10.22.229.14) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.31; Tue, 6 Sep 2022 13:17:16 -0700 Received: from orsmsx607.amr.corp.intel.com (10.22.229.20) by ORSMSX611.amr.corp.intel.com (10.22.229.24) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.31; Tue, 6 Sep 2022 13:17:15 -0700 Received: from ORSEDG602.ED.cps.intel.com (10.7.248.7) by orsmsx607.amr.corp.intel.com (10.22.229.20) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.31 via Frontend Transport; Tue, 6 Sep 2022 13:17:15 -0700 Received: from NAM10-MW2-obe.outbound.protection.outlook.com (104.47.55.105) by edgegateway.intel.com (134.134.137.103) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.1.2375.31; Tue, 6 Sep 2022 13:17:14 -0700 ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=h28KfABK1wl87sz/eXyI0U27Y7T4blx98FD2vHxYu4/SkdgFzvqcXAWjH2JhAogpZO0OkOVoi2uSyrfJe3rssJevi2djdyml/y+jeKFkR87bMoRGPSFFIW0THXZQhtuCPzDYnZlPHUUuqUpdPtH1u92T0XjIWtvCPdd0Cqv7kd7NBQCzieRh8wuXCaMUEBAUPtBwEhMSfM0emdVpnJLgrWF8qArKCfvwLHYnaqdO7EEzWBhlcIk+Won9SxGt/+F/pmy3vlgdgpEO75JaXZaWwxowSiitEe/NKrNoXvK8Oabe51TEtE+Xb+PPzGxbfxDBmX8g09VCndXhOrQIX5aC8g== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; 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=Ve6QdgVn2HhUmYWGm9Qgx+/p/gLZiytkBQP39Am1k4c=; b=m2huJ1jpOg1CQ5V0MJc2jkR8Xp03L3Od7xJ1ng1zK7I+Lhsq2cW/JjYnhdCUF9AEkEjQX8Sea5UnZL0nZaV0dE1xqxLQ91BOyGINwcy/DuvHHQWcSIi7aZrFvcAm1MtB0lt+vBeMTWLRdNYvQ4FkjXW3BoP7KpBkw7H71+AwcCMGCEbPIsMld44g/pDU33rvlE94haIVPWgv1whIDfQrUWLvISLuGCXc68gDmiqvoDbuGj/cXXmHHdkZujsLRODEv3SovhaQIuayAvd6GXsWtwyUIOcyLCm0YzKPuRzZy7usJFxS17W4F/+ZnmfGsTuiJv+jtW2WAz7NACz9+yHQPA== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=intel.com; dmarc=pass action=none header.from=intel.com; dkim=pass header.d=intel.com; arc=none Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=intel.com; Received: from DM4PR11MB5373.namprd11.prod.outlook.com (2603:10b6:5:394::7) by CH0PR11MB5396.namprd11.prod.outlook.com (2603:10b6:610:bb::20) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.5588.12; Tue, 6 Sep 2022 20:17:13 +0000 Received: from DM4PR11MB5373.namprd11.prod.outlook.com ([fe80::b04c:807c:4ea0:c62e]) by DM4PR11MB5373.namprd11.prod.outlook.com ([fe80::b04c:807c:4ea0:c62e%9]) with mapi id 15.20.5588.018; Tue, 6 Sep 2022 20:17:13 +0000 From: =?UTF-8?q?Micha=C5=82=20Winiarski?= To: , , CC: David Airlie , Daniel Vetter , "Maarten Lankhorst" , Maxime Ripard , Thomas Zimmermann , Simon Ser , Matthew Wilcox , =?UTF-8?q?Micha=C5=82=20Winiarski?= Subject: [PATCH v4 3/3] drm: Introduce skip_legacy_minors modparam Date: Tue, 6 Sep 2022 22:16:29 +0200 Message-ID: <20220906201629.419160-4-michal.winiarski@intel.com> X-Mailer: git-send-email 2.37.1 In-Reply-To: <20220906201629.419160-1-michal.winiarski@intel.com> References: <20220906201629.419160-1-michal.winiarski@intel.com> Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: FR3P281CA0138.DEUP281.PROD.OUTLOOK.COM (2603:10a6:d10:95::17) To DM4PR11MB5373.namprd11.prod.outlook.com (2603:10b6:5:394::7) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 601a84de-af16-4228-777e-08da9044c924 X-MS-TrafficTypeDiagnostic: CH0PR11MB5396:EE_ X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: HEOJ0k4NMriI/VrGLW1ONpsqKrYFto2gy3nsFbOHPosO6kuMgUfKMIwzPiOSTFc0HAbggyGUwmUAZMhqFnfXVIify6cGkOy8yYruC6lXb9WvzTadR57HlZDXcplDLxREstsXOGPesUkkeVGYhJbIkk1LbwwLWvA7mlWTxf84wk22+1yB8vfaH1lsHNiFRUNauWemiNq9jeHl5TwW2Yxz1X/++BNcWtYy8ECJ0sv1CBGJLs6rOTtbtJ2pFc3gzKD9WMdVnROCtZsaAxYaVpB4jk0XMn9kNS2t0l72ahNbX3AugN+xpLLpwEGAYtYlTsisIoVYr5ybHJA9XHPrWrv7XbKfXpw3U38cHqd76QN20lhzwD6+XEx9Rqd5LLL2a5WN0RCd6zZT4pvoR+YxNNP8NWzRIFxqvCKsYPtOYjArr+JWDSzqBzecVfrFngbVDDtOdS2GueXuz8G95l4t2iUFO8a7r13FNymJjUhpc/oi/+I5P4YhIH/DlVaQg0DX3cnOgjN8NA4AFYfeiIezAuhXq/SipDYRoD0IQVZ9PE4+aB19NOm78ViprnUOE3cgIAaiFmRQ4H/KfaLvgPVrKeJbru66n+LAUpDXQPKvos2VJ4wcF/YwyDqiX1qvKYqRt8kZShgch5V+WXJFA3vMvym5EJhkb6+P9XFE+lrUIH+pC7rf1VJkUuSYua6/HOwi1tavM+w1yNehPmkGgAAmHJbEPQ== X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:DM4PR11MB5373.namprd11.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230016)(376002)(396003)(346002)(136003)(39860400002)(366004)(316002)(54906003)(86362001)(82960400001)(36756003)(2906002)(38100700002)(5660300002)(8936002)(7416002)(66946007)(4326008)(66476007)(83380400001)(8676002)(6512007)(6486002)(2616005)(6666004)(186003)(1076003)(6506007)(478600001)(66556008)(41300700001)(26005);DIR:OUT;SFP:1102; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?utf-8?B?bTIwalE0Y0h0UTRDWURKUjJKZng4bTI4Z05wTm9BTjExSURjbTZHMlhwbFJG?= =?utf-8?B?UEQ3SGRGaVVWR3l4K3gxWEt6Tk84aFNVbndaNTQ0TTRmNXF6clZRNEtKVHRt?= =?utf-8?B?WTlQcjdQanNWT1FlbHdEMGYwOEVRaHpUQjJvMTkwUXRIMjR4Y2dSZElmanQ0?= =?utf-8?B?bktJRDVIN0xOcTRleUFBSUJHUksrRm1tUzROWHBkRU92ZnR1Ym8vdTZlbWxU?= =?utf-8?B?bmJLY1NxdEdRbXFSRGk4VFR4SnUrSVRqbTEveDlXSndIRzBPQkRRTjJlcno4?= =?utf-8?B?bUQydm00Q2VnUytGUTJsRk5LNXN3ZzQzTndCdWxrSzlKTk5VWVhrMmR6NzZw?= =?utf-8?B?b2VYUW1URGJSNmk3L3VoTk95RFFxWUllRnBqWlYvK0kvbHJSQzZEYVJPYVBL?= =?utf-8?B?NmM5UFEvVXd0YjZvdFVOVE16UzZPUE1vVVlScEdCaXVsRy9pbXRTVnJGeUJE?= =?utf-8?B?dFhON3E1aDJ5WDNWa0syZnA4OWlNK0pQbFU1ODM4ZExqUzlSV0lFeDBUbDVr?= =?utf-8?B?SG1UMGJqNXV1VDZyaFQrczBVVzlTZXdjMENWK20vOHpINi9BZ1Nvb1p5VWRm?= =?utf-8?B?a21pWElxTTNTVndyUS9jMWFhMklJQW9sK3kvMnRVK0JtWCtIZ3hXMS9KelMr?= =?utf-8?B?Q3E2ZUI2NUhUNGhhMSt1Z3liL3Jvc2JQcnhuVHRRcHRqSXJUbGtmU004Nm8v?= =?utf-8?B?NWJNWkJ3VXR3bldCS3hPY3dTd3I5YVMvRm1BQzhwTFBCcHFETlNHeUdZeWlB?= =?utf-8?B?L0F6bDRGMXpNS0dYdHV0RmRtZXVsSDgySEMxbVN6dC9KUEQ5REt4SmhjMmRW?= =?utf-8?B?WEQxWWVsYVNMbmxtWTZldG9RaVhEbDUwcytybklqZWIvakhXejd3SmxMOHdt?= =?utf-8?B?bHR6YzhHV0R5cWZpTkVCMkRKTmlNK05xekJyRjlRb0Z6djFNWGt0NUhSZk00?= =?utf-8?B?SHdvVzFORGpER0JaY1JlbGR4YjM5MVNKNjFvVGpwQnhCVEtjTE5TcnA3WXpX?= =?utf-8?B?a1NkKzk1SjVheVhpc09EWTJrNmVXaEdrQnVlWUprVjRxWEM2ZW82VkZJV29o?= =?utf-8?B?WEpaa24zTjJZaUc2MXp1WGRydmdIRS83cVJXZjlZSzNsendiZ3pwbXRNczNS?= =?utf-8?B?YzB5eXNqM25iS3hJQWFwYTlTdWtYWnZIcWpaQXA2MzBEdS9COE11d3hIM1Vh?= =?utf-8?B?QWFpYStOckRwakhhdjFyZ0QyOVY4M2hKN2x4MmR1eU1QVTFjNWFucXo5L0c5?= =?utf-8?B?RytwVDl5T2RSbWVsK0RvN3doNlpTYzcxR24rTW0yRDZPOXZOSDV2Y1ptSTZh?= =?utf-8?B?S2dRQm1paWZZZkF2VVhRZ1BzUjg4ellXTUgzR3BxNWgwaGI1b29xUU56d2dI?= =?utf-8?B?QWxtcnpDeVhEVmg0RCtDbnhOTU9Cc2pKRkRMWUhKZTYvUEtsNUNaemJWd0Rj?= =?utf-8?B?UFZ2bmpqaGNuS2lTQzJGRVgzczBLTDNnYzNyRzJlWVMrZWYxVGdoeTZVNS9j?= =?utf-8?B?dTdQSzVzaStXdVB1OUpPeU5kYkpoWklQcnhyR3pTUXpKZXpWM3ZIbUtpVzBQ?= =?utf-8?B?R29CdVd1cE1Ua1RYNURiNno2aHlIVUNVdEpZQkl2enZKbXA3dzV6Z1hZTHhq?= =?utf-8?B?TGxvR3VhWkV6dDhXa1lsMCt1WTB3U1ZHdGkzR1RTdWQxQ1ZMZGFWQzhPTExP?= =?utf-8?B?TE5UWE9RZ2F0ZTBzQkhqc0RGU2lSUjllL3JNRFhuRFBXV0VVcWJEU0dNUkpn?= =?utf-8?B?VEtKR3pURFFIT3FINlE2OWM5c2pXb1pGSGFodGswVkR6M1gvMEwydG9Za05L?= =?utf-8?B?dTRoaVRPUTdYemxVZjFHTExzREFycktCM2U4U1NCaHV4YjZaUlhzN0t5Tmpp?= =?utf-8?B?OHJEeUdRMWZJdmVjdDdqZGFTaE9ncHdTcjA2amNBTXFBQUpOa1lUUUJwd3Ay?= =?utf-8?B?Qm5manZ1N2RXN0N1ekd2V0FpQjdkQXErY3RsYmpBd3pEUVVYWUhCcC9VUjMy?= =?utf-8?B?V1BJL0lxREpSTFFBTGZBaEEvT3l6SHI2UU0rVE9wK3czbXlZNVFTazdYeUN0?= =?utf-8?B?M2VyNHRnSi9BYU15bFNlUXNIdzNTNjdnWFE3MTU3cFR5cDRQL3ZWTUZtUUsx?= =?utf-8?B?dXFNWU8vbHo0cTVTeGJHbU5CTUI2TTVBSGV4RVZyUVhLNWpGVnJ4MXlVWHJ4?= =?utf-8?B?N1E9PQ==?= X-MS-Exchange-CrossTenant-Network-Message-Id: 601a84de-af16-4228-777e-08da9044c924 X-MS-Exchange-CrossTenant-AuthSource: DM4PR11MB5373.namprd11.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 06 Sep 2022 20:17:13.4694 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 46c98d88-e344-4ed4-8496-4ed7712e255d X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: JhQHx25MuAlcJFKmjRr5eI3U5mvbxxd51BP1j+li5JQ/Hb7Q+LF+Ehk1lUCxZIBjI1svX24lBsDidYYODMpBa6PD6c9bJ3yeHb1vdRgJUQU= X-MS-Exchange-Transport-CrossTenantHeadersStamped: CH0PR11MB5396 X-OriginatorOrg: intel.com Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org While there is support for >64 DRM devices on kernel side, existing userspace may still have some hardcoded assumptions and it's possible that it will require changes to be able to use more than 64 devices. Add a modparam to simplify testing and development of >64 devices support on userspace side by allocating minors from the >=3D192 range (without the need of having >64 physical devices connected). Signed-off-by: Micha=C5=82 Winiarski --- drivers/gpu/drm/drm_drv.c | 12 +++++++++--- 1 file changed, 9 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/drm_drv.c b/drivers/gpu/drm/drm_drv.c index 2c6e0b8d3b7a..11c691543fec 100644 --- a/drivers/gpu/drm/drm_drv.c +++ b/drivers/gpu/drm/drm_drv.c @@ -56,6 +56,11 @@ MODULE_LICENSE("GPL and additional rights"); =20 static DEFINE_XARRAY_ALLOC(drm_minors_xa); =20 +static bool skip_legacy_minors; +module_param_unsafe(skip_legacy_minors, bool, 0400); +MODULE_PARM_DESC(skip_legacy_minors, + "Don't allocate minors in 0-192 range. This can be used for testing use= rspace support for >64 drm devices (default: false)"); + /* * If the drm core fails to init for whatever reason, * we should prevent any drivers from registering with it. @@ -110,7 +115,7 @@ static int drm_minor_alloc(struct drm_device *dev, unsi= gned int type) { struct drm_minor *minor; u32 id; - int r; + int r =3D -EBUSY; =20 minor =3D drmm_kzalloc(dev, sizeof(*minor), GFP_KERNEL); if (!minor) @@ -125,8 +130,9 @@ static int drm_minor_alloc(struct drm_device *dev, unsi= gned int type) * and 128-191 are render nodes. * After reaching the limit, we're allocating minors dynamically - first-= come, first-serve. */ - r =3D xa_alloc(&drm_minors_xa, &id, NULL, - XA_LIMIT(64 * type, 64 * (type + 1) - 1), GFP_KERNEL); + if (!skip_legacy_minors) + r =3D xa_alloc(&drm_minors_xa, &id, NULL, + XA_LIMIT(64 * type, 64 * (type + 1) - 1), GFP_KERNEL); if (r =3D=3D -EBUSY) r =3D xa_alloc(&drm_minors_xa, &id, NULL, XA_LIMIT(192, (1 << MINORBITS) - 1), GFP_KERNEL); --=20 2.37.3