From patchwork Thu Dec 1 07:02:32 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: swati.dhingra@intel.com X-Patchwork-Id: 9455505 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id B4ED86074E for ; Thu, 1 Dec 2016 06:54:36 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id A748C28460 for ; Thu, 1 Dec 2016 06:54:36 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 9C66C28497; Thu, 1 Dec 2016 06:54:36 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-4.2 required=2.0 tests=BAYES_00, RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 5259928460 for ; Thu, 1 Dec 2016 06:54:36 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 43E356E5F4; Thu, 1 Dec 2016 06:54:28 +0000 (UTC) X-Original-To: intel-gfx@lists.freedesktop.org Delivered-To: intel-gfx@lists.freedesktop.org Received: from mga11.intel.com (mga11.intel.com [192.55.52.93]) by gabe.freedesktop.org (Postfix) with ESMTPS id 134E36E64F for ; Thu, 1 Dec 2016 06:54:25 +0000 (UTC) Received: from orsmga004.jf.intel.com ([10.7.209.38]) by fmsmga102.fm.intel.com with ESMTP; 30 Nov 2016 22:54:24 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.33,723,1477983600"; d="scan'208";a="36097922" Received: from swati-desktop.iind.intel.com ([10.223.82.38]) by orsmga004.jf.intel.com with ESMTP; 30 Nov 2016 22:54:22 -0800 From: swati.dhingra@intel.com To: intel-gfx@lists.freedesktop.org Date: Thu, 1 Dec 2016 12:32:32 +0530 Message-Id: <1480575753-5837-3-git-send-email-swati.dhingra@intel.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1480575753-5837-1-git-send-email-swati.dhingra@intel.com> References: <1480575753-5837-1-git-send-email-swati.dhingra@intel.com> Cc: Sourab Gupta , Swati Dhingra Subject: [Intel-gfx] [RFC 2/3] drm: Register drmfs filesystem from drm init X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" X-Virus-Scanned: ClamAV using ClamSMTP From: Swati Dhingra During drm module initialization, drm_core_init initializes the drmfs filesystem and register this with kernel. A driver specific directory is created inside drmfs root, and dentry of this directory is saved for subsequent use by the driver (e.g. i915). The driver can then create files/directories inside this root directory directly. In case of i915 driver, the top directory is created at '/sys/kernel/drm/i915'. Signed-off-by: Sourab Gupta Signed-off-by: Swati Dhingra --- drivers/gpu/drm/drm_drv.c | 22 ++++++++++++++++++++++ include/drm/drm_drv.h | 3 +++ 2 files changed, 25 insertions(+) diff --git a/drivers/gpu/drm/drm_drv.c b/drivers/gpu/drm/drm_drv.c index 84fcfcb..ead360bd 100644 --- a/drivers/gpu/drm/drm_drv.c +++ b/drivers/gpu/drm/drm_drv.c @@ -688,6 +688,14 @@ int drm_dev_register(struct drm_device *dev, unsigned long flags) { int ret; +#ifdef CONFIG_DRMFS + dev->driver->drmfs_root = drmfs_create_dir(dev->driver->name, NULL); + if (IS_ERR(dev->driver->drmfs_root)) { + DRM_ERROR("Failed to get drmfs root dentry\n"); + return PTR_ERR(dev->driver->drmfs_root); + } +#endif + mutex_lock(&drm_global_mutex); ret = drm_minor_register(dev, DRM_MINOR_CONTROL); @@ -758,6 +766,9 @@ void drm_dev_unregister(struct drm_device *dev) drm_minor_unregister(dev, DRM_MINOR_PRIMARY); drm_minor_unregister(dev, DRM_MINOR_RENDER); drm_minor_unregister(dev, DRM_MINOR_CONTROL); +#ifdef CONFIG_DRMFS + drmfs_remove(dev->driver->drmfs_root); +#endif } EXPORT_SYMBOL(drm_dev_unregister); @@ -825,6 +836,9 @@ static void drm_core_exit(void) { unregister_chrdev(DRM_MAJOR, "drm"); debugfs_remove(drm_debugfs_root); +#ifdef CONFIG_DRMFS + drmfs_fini(); +#endif drm_sysfs_destroy(); idr_destroy(&drm_minors_idr); drm_connector_ida_destroy(); @@ -845,6 +859,14 @@ static int __init drm_core_init(void) goto error; } +#ifdef CONFIG_DRMFS + ret = drmfs_init(); + if (ret < 0) { + DRM_ERROR("Cannot create DRM FS: %d\n", ret); + goto error; + } +#endif + drm_debugfs_root = debugfs_create_dir("dri", NULL); if (!drm_debugfs_root) { ret = -ENOMEM; diff --git a/include/drm/drm_drv.h b/include/drm/drm_drv.h index aad8bba..34804de 100644 --- a/include/drm/drm_drv.h +++ b/include/drm/drm_drv.h @@ -403,6 +403,9 @@ struct drm_driver { /* List of devices hanging off this driver with stealth attach. */ struct list_head legacy_dev_list; + + /* drmfs parent directory dentry for this driver */ + struct dentry *drmfs_root; }; extern __printf(6, 7)