From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.12]) (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 C39732EB866; Mon, 24 Nov 2025 12:12:11 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=192.198.163.12 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763986334; cv=none; b=UK+/waw8yqPCFRFzQBpeQCAVdDhAPf8EEWDJhTVLfA+wf8UqvNotEhVih0MFBFDVGrp2QHyHfCHa/OT1/j73uXfPZhEFsiRu9V8JHGO8te6pswc+VYR1NEBKxk3JFwzY2vCC3ZJZqkS+WIt6noYhIIdMQOXXzPIpSa1r2Jxt6Wg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763986334; c=relaxed/simple; bh=VbgYR7rJ09xzyKkM2zSKZNmY3X4tqd/TmXvi9Q2VLzw=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=MTzgU/zsYFqsOdTRRdW+QbYUs4N8KiaKR3Wzy0VvUwsNQsCgY4o+f7qVjG9YoZ65UqSD0gRa+qrH9DXed22JLb9j0AoKOehrw8ScMNue6iC9jDYxHCt3Xkr5Ci9lsm7xHyUOt/kWk+2BXzvglXmC8nCtaGKMcDsGL2KhikPYsi4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com; spf=pass smtp.mailfrom=linux.intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=JxUyjHoN; arc=none smtp.client-ip=192.198.163.12 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="JxUyjHoN" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1763986332; x=1795522332; h=from:to:cc:subject:date:message-id:mime-version: content-transfer-encoding; bh=VbgYR7rJ09xzyKkM2zSKZNmY3X4tqd/TmXvi9Q2VLzw=; b=JxUyjHoNzGJtrcVg90z1gX5cH9WWniEd8hWZVZ1j1Uu/L8J5gPah8NC6 mDEhMFf9Im46gQH5LGVw7E+i8X5NMI00pPYGYgaBGv83Mx7iwjC/vzsTA sX49gCktxKJ+y1xdyJm2AFjB2/jEK6dn02nOfWkCPx6eq5GRvodG7CN0a OWS3hWqRdtAxztNnpVvhAXcXpblhaw4s5MezLj782cnvyUiAJVScGhHuq /aFfDxJuWbWQG1yTkvRb4tNNXrJ7ibre7j84MpmgiRQrTcAhk4fUYukWB O1QauvkhDTfchsmJcFfGDKbVVlMKbpx2inZSVoEH4OhK0j9rYBmlcrFPS Q==; X-CSE-ConnectionGUID: 1MM8hMNLTIC6g3J0RmcKOw== X-CSE-MsgGUID: d8DTAz/+SHqpy5zpfqD31Q== X-IronPort-AV: E=McAfee;i="6800,10657,11622"; a="69847537" X-IronPort-AV: E=Sophos;i="6.20,222,1758610800"; d="scan'208";a="69847537" Received: from orviesa002.jf.intel.com ([10.64.159.142]) by fmvoesa106.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 24 Nov 2025 04:12:09 -0800 X-CSE-ConnectionGUID: 83r+lxHpRIaFo44hbpipxw== X-CSE-MsgGUID: jmYxulCUSdORUvLiN/9xPA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.20,222,1758610800"; d="scan'208";a="222970325" Received: from black.igk.intel.com ([10.91.253.5]) by orviesa002.jf.intel.com with ESMTP; 24 Nov 2025 04:12:04 -0800 Received: by black.igk.intel.com (Postfix, from userid 1003) id 45B41A0; Mon, 24 Nov 2025 13:12:03 +0100 (CET) From: Andy Shevchenko To: Bjorn Andersson , Andy Shevchenko , Stefan Wahren , Vinod Koul , Thomas Andreatta , Caleb Sander Mateos , dmaengine@vger.kernel.org, linux-kernel@vger.kernel.org, linux-rpi-kernel@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-arm-msm@vger.kernel.org Cc: Olivier Dautricourt , Stefan Roese , Florian Fainelli , Ray Jui , Scott Branden , Broadcom internal kernel review list , Lars-Peter Clausen , Eugeniy Paltsev , Daniel Mack , Haojian Zhuang , Robert Jarzmik , Lizhi Hou , Brian Xu , Raj Kumar Rampelli , Michal Simek , Andrew Morton Subject: [PATCH v4 0/13] dmaengine: introduce sg_nents_for_dma() and convert users Date: Mon, 24 Nov 2025 13:09:18 +0100 Message-ID: <20251124121202.424072-1-andriy.shevchenko@linux.intel.com> X-Mailer: git-send-email 2.50.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit A handful of the DMAengine drivers use same routine to calculate the number of SG entries needed for the given DMA transfer. Provide a common helper for them and convert. I left the new helper on SG level of API because brief grepping shows potential candidates outside of DMA engine, e.g.: drivers/crypto/chelsio/chcr_algo.c:154: nents += DIV_ROUND_UP(less, entlen); drivers/spi/spi-stm32.c:1495: /* Count the number of entries needed */ Changelog v4: - fixed compilation errors (Vinod) v3: <20251113151603.3031717-1-andriy.shevchenko@linux.intel.com> Changelog v3: - added missed EXPORT_SYMBOL() (Bjorn) - left the return type as signed int (as agreed with Bjorn) - collected tags (Bjorn) v2: <20251110103805.3562136-1-andriy.shevchenko@linux.intel.com> Changelog v2: - dropped outdated patches (only 9 years passed :-) - rebased on top of the current kernel - left API SG wide It might v1: https://patchwork.kernel.org/project/linux-dmaengine/patch/20161021173535.100245-1-andriy.shevchenko@linux.intel.com/ Andy Shevchenko (13): scatterlist: introduce sg_nents_for_dma() helper dmaengine: altera-msgdma: use sg_nents_for_dma() helper dmaengine: axi-dmac: use sg_nents_for_dma() helper dmaengine: bcm2835-dma: use sg_nents_for_dma() helper dmaengine: dw-axi-dmac: use sg_nents_for_dma() helper dmaengine: k3dma: use sg_nents_for_dma() helper dmaengine: lgm: use sg_nents_for_dma() helper dmaengine: pxa-dma: use sg_nents_for_dma() helper dmaengine: qcom: adm: use sg_nents_for_dma() helper dmaengine: qcom: bam_dma: use sg_nents_for_dma() helper dmaengine: sa11x0: use sg_nents_for_dma() helper dmaengine: sh: use sg_nents_for_dma() helper dmaengine: xilinx: xdma: use sg_nents_for_dma() helper drivers/dma/altera-msgdma.c | 5 ++-- drivers/dma/bcm2835-dma.c | 19 +------------- drivers/dma/dma-axi-dmac.c | 5 +--- .../dma/dw-axi-dmac/dw-axi-dmac-platform.c | 6 ++--- drivers/dma/k3dma.c | 9 ++----- drivers/dma/lgm/lgm-dma.c | 9 ++----- drivers/dma/pxa_dma.c | 5 ++-- drivers/dma/qcom/bam_dma.c | 9 ++----- drivers/dma/qcom/qcom_adm.c | 9 +++---- drivers/dma/sa11x0-dma.c | 6 ++--- drivers/dma/sh/shdma-base.c | 5 ++-- drivers/dma/xilinx/xdma.c | 6 ++--- include/linux/scatterlist.h | 2 ++ lib/scatterlist.c | 26 +++++++++++++++++++ 14 files changed, 52 insertions(+), 69 deletions(-) -- 2.50.1