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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (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 0AD92C43334 for ; Thu, 16 Jun 2022 12:12:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References: Message-ID:Subject:Cc:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=dWBXYCv3Bk2GSDftkptm045aVLkT4ATYFNRxXQp5l/o=; b=Qh8os+xQ3kzUmn R6vulJy70lm7KLeixUw9+KU0+BqtHA8ImALfb1T/JP2iAj6iArNttAk+61BdM6jFmPoEWz37ZZ5yn 2dH4iZQGI094rkP+M38jmXXLVrjyhgSU0VSrQw069F1HrG0I4B1Tmm2lFkqUsm4xMlLe/5mIuEQ7R 2l28iCcFsCh3BdC6CHAJM+MZKLWLHU9bDTteuRMufvtQNEoHyFv4AGrXx/5FJdcGKaZlFdF8R/gar mcfxO2jlKebGHD5pA4gPJBe6rTcfD5yZlxnq9QmLmUFEeB8w5ZU2r9yjw1u67fEdlXkfQbYFk9K3l kC+IoLaUYrb4N1tNhRPQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1o1oLz-002FwC-V1; Thu, 16 Jun 2022 12:12:03 +0000 Received: from verein.lst.de ([213.95.11.211]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1o1oLx-002FvU-In for linux-riscv@lists.infradead.org; Thu, 16 Jun 2022 12:12:02 +0000 Received: by verein.lst.de (Postfix, from userid 2407) id 464AD67373; Thu, 16 Jun 2022 14:11:57 +0200 (CEST) Date: Thu, 16 Jun 2022 14:11:57 +0200 From: Christoph Hellwig To: Heiko =?iso-8859-1?Q?St=FCbner?= Cc: Christoph Hellwig , palmer@dabbelt.com, paul.walmsley@sifive.com, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, wefu@redhat.com, guoren@kernel.org, cmuellner@linux.com, philipp.tomsich@vrull.eu, samuel@sholland.org, atishp@atishpatra.org, anup@brainfault.org, mick@ics.forth.gr, robh+dt@kernel.org, krzk+dt@kernel.org, devicetree@vger.kernel.org, drew@beagleboard.org, Atish Patra Subject: Re: [PATCH 2/3] riscv: Implement Zicbom-based cache management operations Message-ID: <20220616121157.GA11657@lst.de> References: <20220610004308.1903626-1-heiko@sntech.de> <1752040.TLkxdtWsSY@diego> <20220616115342.GA11289@lst.de> <2041345.KlZ2vcFHjT@diego> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <2041345.KlZ2vcFHjT@diego> User-Agent: Mutt/1.5.17 (2007-11-01) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220616_051201_827202_85324FAE X-CRM114-Status: UNSURE ( 7.52 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org On Thu, Jun 16, 2022 at 02:09:47PM +0200, Heiko St=FCbner wrote: > My guess was that new platforms implementing cache-management will want > to be non-coherent by default? No. Cache incoherent DMA is absolutely horrible and almost impossible to get right for the corner cases. It is a cost cutting measure seen on cheap SOCs and mostly avoided for more enterprise grade products. _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv