From mboxrd@z Thu Jan 1 00:00:00 1970 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 3488CEE57D5 for ; Wed, 31 Dec 2025 05:55:32 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id B289010E979; Wed, 31 Dec 2025 05:55:30 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=intel.com header.i=@intel.com header.b="b09dgnL7"; dkim-atps=neutral Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.12]) by gabe.freedesktop.org (Postfix) with ESMTPS id A4F3710E83B for ; Wed, 31 Dec 2025 05:55:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1767160530; x=1798696530; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=6zMBYTw3vLpI6X+xWWDCKFdiYJZA1S0pw1U9BM/zQvM=; b=b09dgnL7WZZblR5IPpXq96hOpCKYutn+77TkKNXvH2nvEMPxTCzZo7kb 9moElqTMeWEPWYtM6Dy/eOvt00XZMCZT6MQpykPrchB1PTjwqsXblXRaB BhZeuPdCA67iSOCg27iX7za12m2ZHRNXUd1Pui87CL1PI7ph8dy5HKIK8 3EtSzg+CdB2AZPU1JPbYzS9jdbzHh4Nd50HCK+tfYrJNPb9PI/EuzeAW4 NqD0oM/nIm5FSVqRI4hLRvRcI3rwWq3WbkbxHVlwgMTEc2jHp4EhfswkC /YeP3gFCmBQ+CEtseRhYVmsLPPJA0QGYrjquZoMLuNxQG0aF4QOmzbY1i Q==; X-CSE-ConnectionGUID: aqq68uBATZyFZbmlVGrFog== X-CSE-MsgGUID: OziUOX7lSeqogUA6GAwsFQ== X-IronPort-AV: E=McAfee;i="6800,10657,11657"; a="72590000" X-IronPort-AV: E=Sophos;i="6.21,191,1763452800"; d="scan'208";a="72590000" Received: from orviesa009.jf.intel.com ([10.64.159.149]) by fmvoesa106.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 30 Dec 2025 21:55:29 -0800 X-CSE-ConnectionGUID: rgvKiJI2RTehjXLuRKjZ8Q== X-CSE-MsgGUID: MUe3ShrWSeqPtQ5DmsozHA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.21,191,1763452800"; d="scan'208";a="201119706" Received: from dut6304bmgfrd.fm.intel.com ([10.36.21.42]) by orviesa009.jf.intel.com with ESMTP; 30 Dec 2025 21:55:29 -0800 From: Xin Wang To: igt-dev@lists.freedesktop.org Cc: alex.zuo@intel.com, shuicheng.lin@intel.com, stuart.summers@intel.com, kamil.konieczny@intel.com, matthew.d.roper@intel.com, ravi.kumar.vodapalli@intel.com, zbigniew.kempczynski@intel.com, Xin Wang Subject: [PATCH v9 2/5] include/linux_scaffold: add FIELD_GET() bitfield helper Date: Wed, 31 Dec 2025 05:55:22 +0000 Message-ID: <20251231055525.51524-3-x.wang@intel.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20251231055525.51524-1-x.wang@intel.com> References: <20251231055525.51524-1-x.wang@intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-BeenThere: igt-dev@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Development mailing list for IGT GPU Tools List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: igt-dev-bounces@lists.freedesktop.org Sender: "igt-dev" Add __bf_shf() and FIELD_GET() so code can extract bitfields from registers using a mask, matching the common Linux FIELD_GET() semantics without pulling in kernel headers. Signed-off-by: Xin Wang --- include/linux_scaffold.h | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/include/linux_scaffold.h b/include/linux_scaffold.h index f6620ad0a..bd69c1ed2 100644 --- a/include/linux_scaffold.h +++ b/include/linux_scaffold.h @@ -51,4 +51,9 @@ static inline s64 sign_extend64(u64 value, int index) #define BITS_PER_LONG BITS_PER_TYPE(long) #define BITS_PER_LONG_LONG BITS_PER_TYPE(long long) +#define __bf_shf(x) (__builtin_ffsll(x) - 1) + +#define FIELD_GET(mask, reg) \ + (typeof(mask))(((reg) & (mask)) >> __bf_shf(mask)) + #endif /* _INTEL_GPU_COMMANDS_SCAFFOLD_H_ */ -- 2.43.0