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 X-Spam-Level: X-Spam-Status: No, score=-16.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_SANE_1 autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 80FBBC4338F for ; Mon, 26 Jul 2021 07:01:10 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id 50B32603E7 for ; Mon, 26 Jul 2021 07:01:10 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 50B32603E7 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=lists.infradead.org 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=fnH8rtIQj6JjpuCLzC8Zsay6o8X0NuR6o53EcOZRYVY=; b=epWQ1WklESZsDl ay3EBdfsL3YjsfUo5BMrYwA4AA2DMHg9CpJ2D8Xr4150oOePJmhgYDLpOAmKUgo+241r9WfKLl/e5 rWLa6LQArcSWTf6fpemJK9djQ77Htkl2hLMN+PKOsRt9YeKrM7UUQFWLoV6z5tMQ4ma9Ia4LrL5Yw OovMiIqfHhMG8UXjopQUQzeC8pYGoIP2EnprNUEANSUIcyXSFH23HpqBSnoJZq2phdX/cDvRG0HAG kxJYvnTyAh13/GcqfG64aWvWSc/WUGbue81dCS2BTNJTmJQu329UeXBm1df7kc3aUQ9Up8Sy/1cij 0HcH+t1Y706zHqX1P9RQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1m7ubp-009nyB-By; Mon, 26 Jul 2021 07:01:05 +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 1m7ubn-009nxA-43 for linux-riscv@lists.infradead.org; Mon, 26 Jul 2021 07:01:04 +0000 Received: by verein.lst.de (Postfix, from userid 2407) id B117C68BEB; Mon, 26 Jul 2021 09:01:00 +0200 (CEST) Date: Mon, 26 Jul 2021 09:01:00 +0200 From: Christoph Hellwig To: Atish Patra Cc: linux-kernel@vger.kernel.org, Albert Ou , Christoph Hellwig , devicetree@vger.kernel.org, Dmitry Vyukov , Frank Rowand , Guo Ren , iommu@lists.linux-foundation.org, linux-riscv@lists.infradead.org, Marek Szyprowski , Palmer Dabbelt , Paul Walmsley , Rob Herring , Robin Murphy , Tobias Klauser Subject: Re: [RFC 4/5] dma-direct: Allocate dma pages directly if global pool allocation fails Message-ID: <20210726070100.GC9035@lst.de> References: <20210723214031.3251801-1-atish.patra@wdc.com> <20210723214031.3251801-5-atish.patra@wdc.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20210723214031.3251801-5-atish.patra@wdc.com> 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-20210726_000103_402248_B7FAF538 X-CRM114-Status: GOOD ( 22.22 ) 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="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org On Fri, Jul 23, 2021 at 02:40:30PM -0700, Atish Patra wrote: > DMA_GLOBAL_POOL config may be enabled for platforms where global pool is > not supported because a generic defconfig is expected to boot on different > platforms. Specifically, some RISC-V platforms may use global pool for > non-coherent devices while some other platforms are completely coherent. > However, it is expected that single kernel image must boot on all the > platforms. > > Continue the dma direct allocation if a allocation from global pool failed. > This indicates that the platform is relying on some other method (direct > remap) or just have coherent devices. > > Signed-off-by: Atish Patra > --- > kernel/dma/direct.c | 7 +++++-- > 1 file changed, 5 insertions(+), 2 deletions(-) > > diff --git a/kernel/dma/direct.c b/kernel/dma/direct.c > index d1d0258ed6d0..984ea776f099 100644 > --- a/kernel/dma/direct.c > +++ b/kernel/dma/direct.c > @@ -161,8 +161,11 @@ void *dma_direct_alloc(struct device *dev, size_t size, > return arch_dma_alloc(dev, size, dma_handle, gfp, attrs); > > if (IS_ENABLED(CONFIG_DMA_GLOBAL_POOL) && > - !dev_is_dma_coherent(dev)) > - return dma_alloc_from_global_coherent(dev, size, dma_handle); > + !dev_is_dma_coherent(dev)) { > + ret = dma_alloc_from_global_coherent(dev, size, dma_handle); > + if (ret) > + return ret; This will now silently return normal non-cache coherent memory when the global pool allocation fails, and thus is completely broken. _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv