From patchwork Sun Feb 27 14:30:46 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 12761795 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 439EFC43217 for ; Sun, 27 Feb 2022 14:31:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230432AbiB0Ob4 (ORCPT ); Sun, 27 Feb 2022 09:31:56 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55950 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229492AbiB0Ob4 (ORCPT ); Sun, 27 Feb 2022 09:31:56 -0500 Received: from bombadil.infradead.org (bombadil.infradead.org [IPv6:2607:7c80:54:e::133]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id CDBC556200; Sun, 27 Feb 2022 06:31:17 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20210309; h=Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender :Reply-To:Content-Type:Content-ID:Content-Description; bh=+WiBOXA0MRDZn1kqTV3ww0Ba1VAfcBaU/VHzqZHaxWQ=; b=UcMvfw8PmtRTqsFC3KR7eGE16Z ScdqwnvCgitmv45Q5ry3OAtO9pAZicvl9XYX8rtjmHIqsoPld+fqpCFXgiJWUTVNQXrtRr5+gJ7G9 zNDGvmhjJvotR5KJmi+LerfiLBEJ8+g/DV8hmCvfEcASMbpdUSh3+Ys0hMCj0wzEo22LHDc5AFJm3 460k5swhB+imd2zecCUtx/NDpMxrE8s8/T/tQZp56g/hNMchq2zBI1AwK8BJ9KguClDyChdet3gjn MlZpKgk5YExrCKU0+vtPE1aDMIW2Hw5Nk4N8c/3a/rZIJTo3dD7J9ofdhbwHjFQZ6o6APbGFVdnMk lx+LUO+Q==; Received: from [213.208.157.39] (helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1nOKZk-009NuE-Cz; Sun, 27 Feb 2022 14:31:04 +0000 From: Christoph Hellwig To: iommu@lists.linux-foundation.org Cc: x86@kernel.org, Anshuman Khandual , Konrad Rzeszutek Wilk , Stefano Stabellini , Boris Ostrovsky , Juergen Gross , Joerg Roedel , David Woodhouse , Lu Baolu , Robin Murphy , linux-arm-kernel@lists.infradead.org, xen-devel@lists.xenproject.org, linux-ia64@vger.kernel.org, linux-mips@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-hyperv@vger.kernel.org, tboot-devel@lists.sourceforge.net, linux-pci@vger.kernel.org Subject: [PATCH 02/11] swiotlb: make swiotlb_exit a no-op if SWIOTLB_FORCE is set Date: Sun, 27 Feb 2022 15:30:46 +0100 Message-Id: <20220227143055.335596-3-hch@lst.de> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20220227143055.335596-1-hch@lst.de> References: <20220227143055.335596-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org If force bouncing is enabled we can't release the buffers. Signed-off-by: Christoph Hellwig Reviewed-by: Anshuman Khandual --- kernel/dma/swiotlb.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c index f1e7ea160b433..36fbf1181d285 100644 --- a/kernel/dma/swiotlb.c +++ b/kernel/dma/swiotlb.c @@ -378,6 +378,9 @@ void __init swiotlb_exit(void) unsigned long tbl_vaddr; size_t tbl_size, slots_size; + if (swiotlb_force == SWIOTLB_FORCE) + return; + if (!mem->nslabs) return;