From patchwork Mon Mar 27 12:13:06 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Arnd Bergmann X-Patchwork-Id: 13189137 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 1EDA7C761AF for ; Mon, 27 Mar 2023 12:16:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232897AbjC0MQ1 (ORCPT ); Mon, 27 Mar 2023 08:16:27 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34618 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229892AbjC0MQE (ORCPT ); Mon, 27 Mar 2023 08:16:04 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 70F0E49F5; Mon, 27 Mar 2023 05:15:26 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 127FD611F2; Mon, 27 Mar 2023 12:15:25 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 56A3DC433A4; Mon, 27 Mar 2023 12:15:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1679919324; bh=X7ixDT/eME8zr2M/ikt5bC5rQoS3uASy2IlC1ftIdSM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Y2ffntjZwCcvJ7ZjcddqfIzivLJJTiZqbCBMhicCNOoftlZSKr8SZk1bt+v6QBdJ3 AqWhwmcTeaS96y4RUjpqI9FGKTqNfAOz/7RBt+ymuWQLCwljPJr+H8JgdNwFdqMXwE J72tIuLXAnxcA7lDtjwg32UTtKQ0DkssHKQnBWYb3L+gXkApRayP0Mte6XTqD4QU75 zUBFdzaO9TiPGVooVFe2U07En2yoiRB9h1tj51608yH2BmWke6vfUVRIXO9jhZyAf0 Nifety/7HWh8t+jBWCaVsZT7PH2v1d96plBTbAk5HzBMivkiokDHTCIu3jr6mGkPTw a3+V9R9fKm3ag== From: Arnd Bergmann To: linux-kernel@vger.kernel.org Cc: Arnd Bergmann , Vineet Gupta , Russell King , Neil Armstrong , Linus Walleij , Catalin Marinas , Will Deacon , Guo Ren , Brian Cain , Geert Uytterhoeven , Michal Simek , Thomas Bogendoerfer , Dinh Nguyen , Stafford Horne , Helge Deller , Michael Ellerman , Christophe Leroy , Paul Walmsley , Palmer Dabbelt , Rich Felker , John Paul Adrian Glaubitz , "David S. Miller" , Max Filippov , Christoph Hellwig , Robin Murphy , Lad Prabhakar , Conor Dooley , linux-snps-arc@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-oxnas@groups.io, linux-csky@vger.kernel.org, linux-hexagon@vger.kernel.org, linux-m68k@lists.linux-m68k.org, linux-mips@vger.kernel.org, linux-openrisc@vger.kernel.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-sh@vger.kernel.org, sparclinux@vger.kernel.org, linux-xtensa@linux-xtensa.org Subject: [PATCH 10/21] csky: dma-mapping: skip invalidating before DMA from device Date: Mon, 27 Mar 2023 14:13:06 +0200 Message-Id: <20230327121317.4081816-11-arnd@kernel.org> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230327121317.4081816-1-arnd@kernel.org> References: <20230327121317.4081816-1-arnd@kernel.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-parisc@vger.kernel.org From: Arnd Bergmann csky is the only architecture that does a full flush for the dma_sync_*_for_device(..., DMA_FROM_DEVICE) operation. The requirement is only make sure there are no dirty cache lines for the buffer, which can be either done through an invalidate operation (as on most architectures including arm32, mips and arc), or a writeback (as on arm64 and riscv). The cache also has to be invalidated eventually but csky already does that after the transfer. Use a 'clean' operation here for consistency with arm64 and riscv. Signed-off-by: Arnd Bergmann Reviewed-by: Guo Ren --- arch/csky/mm/dma-mapping.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) diff --git a/arch/csky/mm/dma-mapping.c b/arch/csky/mm/dma-mapping.c index 82447029feb4..c90f912e2822 100644 --- a/arch/csky/mm/dma-mapping.c +++ b/arch/csky/mm/dma-mapping.c @@ -60,11 +60,9 @@ void arch_sync_dma_for_device(phys_addr_t paddr, size_t size, { switch (dir) { case DMA_TO_DEVICE: - cache_op(paddr, size, dma_wb_range); - break; case DMA_FROM_DEVICE: case DMA_BIDIRECTIONAL: - cache_op(paddr, size, dma_wbinv_range); + cache_op(paddr, size, dma_wb_range); break; default: BUG();