From patchwork Wed Jan 11 15:51:59 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Deepak R Varma X-Patchwork-Id: 13096894 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 0D97CC5479D for ; Wed, 11 Jan 2023 15:52:14 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 5252910E76E; Wed, 11 Jan 2023 15:52:13 +0000 (UTC) Received: from msg-2.mailo.com (msg-2.mailo.com [213.182.54.12]) by gabe.freedesktop.org (Postfix) with ESMTPS id 016BA10E76E; Wed, 11 Jan 2023 15:52:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=mailo.com; s=mailo; t=1673452324; bh=QHeZldMKVWp9Cp9mxOeha2QFBOXYtsTVP8kjQEfSrZw=; h=X-EA-Auth:Date:From:To:Cc:Subject:Message-ID:References: MIME-Version:Content-Type:In-Reply-To; b=dhQ76Q5qWbdwieoX7S8a3HflKBaJR5R0TTGJXGnzA32tstm4XcijZEOvFS62J5qM5 VaQJIcf8JLwEM0aMQYeS8QIdcD7CJm5uN1jgkn/WSHLOy0PbnPvxXEKQzPhgzUzccW a0baxbbbXs7geGagVcVdV/18+jQTMvgzKA4nmfMc= Received: by b-1.in.mailobj.net [192.168.90.11] with ESMTP via ip-206.mailobj.net [213.182.55.206] Wed, 11 Jan 2023 16:52:03 +0100 (CET) X-EA-Auth: u5jvOLR5x9//Zkc8IMR5oNVJAAF0lJRlVIyLovRtl5gS15Vj30kxR2eXf+WDRR0PXE7lTP9chqyCJpfbE+S9CoqnkWNXnn/t Date: Wed, 11 Jan 2023 21:21:59 +0530 From: Deepak R Varma To: Jani Nikula , Joonas Lahtinen , Rodrigo Vivi , Tvrtko Ursulin , David Airlie , Daniel Vetter , intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org Message-ID: <5d26e924ec8dea21925c77fa79a2bf2a34cef705.1673451705.git.drv@mailo.com> References: MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: Subject: [Intel-gfx] [PATCH v3 2/2] drm/i915/fbc: Avoid full proxy f_ops for FBC debug attributes 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: Praveen Kumar , Saurabh Singh Sengar Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" Using DEFINE_SIMPLE_ATTRIBUTE macro with the debugfs_create_file() function adds the overhead of introducing a proxy file operation functions to wrap the original read/write inside file removal protection functions. This adds significant overhead in terms of introducing and managing the proxy factory file operations structure and function wrapping at runtime. As a replacement, a combination of DEFINE_DEBUGFS_ATTRIBUTE macro paired with debugfs_create_file_unsafe() is suggested to be used instead. The DEFINE_DEBUGFS_ATTRIBUTE utilises debugfs_file_get() and debugfs_file_put() wrappers to protect the original read and write function calls for the debug attributes. There is no need for any runtime proxy file operations to be managed by the debugfs core. Following coccicheck make command helped identify this change: make coccicheck M=drivers/gpu/drm/i915/ MODE=patch COCCI=./scripts/coccinelle/api/debugfs/debugfs_simple_attr.cocci Signed-off-by: Deepak R Varma --- Changes in v3: - None Changes in v2: - Include coccicheck make command in the patch log message for clarity. Suggested by Rodrigo Vivi drivers/gpu/drm/i915/display/intel_fbc.c | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) diff --git a/drivers/gpu/drm/i915/display/intel_fbc.c b/drivers/gpu/drm/i915/display/intel_fbc.c index 5e69d3c11d21..c508dcf415b4 100644 --- a/drivers/gpu/drm/i915/display/intel_fbc.c +++ b/drivers/gpu/drm/i915/display/intel_fbc.c @@ -1807,10 +1807,10 @@ static int intel_fbc_debugfs_false_color_set(void *data, u64 val) return 0; } -DEFINE_SIMPLE_ATTRIBUTE(intel_fbc_debugfs_false_color_fops, - intel_fbc_debugfs_false_color_get, - intel_fbc_debugfs_false_color_set, - "%llu\n"); +DEFINE_DEBUGFS_ATTRIBUTE(intel_fbc_debugfs_false_color_fops, + intel_fbc_debugfs_false_color_get, + intel_fbc_debugfs_false_color_set, + "%llu\n"); static void intel_fbc_debugfs_add(struct intel_fbc *fbc, struct dentry *parent) @@ -1819,8 +1819,8 @@ static void intel_fbc_debugfs_add(struct intel_fbc *fbc, fbc, &intel_fbc_debugfs_status_fops); if (fbc->funcs->set_false_color) - debugfs_create_file("i915_fbc_false_color", 0644, parent, - fbc, &intel_fbc_debugfs_false_color_fops); + debugfs_create_file_unsafe("i915_fbc_false_color", 0644, parent, + fbc, &intel_fbc_debugfs_false_color_fops); } void intel_fbc_crtc_debugfs_add(struct intel_crtc *crtc)