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=-13.0 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 87992C4345A for ; Tue, 14 Jul 2020 12:40:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5F268208FE for ; Tue, 14 Jul 2020 12:40:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728578AbgGNMkQ (ORCPT ); Tue, 14 Jul 2020 08:40:16 -0400 Received: from mx2.suse.de ([195.135.220.15]:54780 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728455AbgGNMkB (ORCPT ); Tue, 14 Jul 2020 08:40:01 -0400 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id 11DD0AD3A; Tue, 14 Jul 2020 12:40:02 +0000 (UTC) From: Nicolas Saenz Julienne To: hch@lst.de, linux-kernel@vger.kernel.org, Marek Szyprowski , Robin Murphy Cc: linux-rpi-kernel@lists.infradead.org, jeremy.linton@arm.com, Nicolas Saenz Julienne , iommu@lists.linux-foundation.org Subject: [PATCH v2 1/4] dma-direct: Provide function to check physical memory area validity Date: Tue, 14 Jul 2020 14:39:25 +0200 Message-Id: <20200714123928.8581-2-nsaenzjulienne@suse.de> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20200714123928.8581-1-nsaenzjulienne@suse.de> References: <20200714123928.8581-1-nsaenzjulienne@suse.de> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org dma_coherent_ok() checks if a physical memory area fits a device's DMA constraints. Signed-off-by: Nicolas Saenz Julienne --- include/linux/dma-direct.h | 1 + kernel/dma/direct.c | 2 +- 2 files changed, 2 insertions(+), 1 deletion(-) diff --git a/include/linux/dma-direct.h b/include/linux/dma-direct.h index 5184735a0fe8..ab2e20cba951 100644 --- a/include/linux/dma-direct.h +++ b/include/linux/dma-direct.h @@ -69,6 +69,7 @@ static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size, u64 dma_direct_get_required_mask(struct device *dev); gfp_t dma_direct_optimal_gfp_mask(struct device *dev, u64 dma_mask, u64 *phys_mask); +bool dma_coherent_ok(struct device *dev, phys_addr_t phys, size_t size); void *dma_direct_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs); void dma_direct_free(struct device *dev, size_t size, void *cpu_addr, diff --git a/kernel/dma/direct.c b/kernel/dma/direct.c index 95866b647581..67f060b86a73 100644 --- a/kernel/dma/direct.c +++ b/kernel/dma/direct.c @@ -70,7 +70,7 @@ gfp_t dma_direct_optimal_gfp_mask(struct device *dev, u64 dma_mask, return 0; } -static bool dma_coherent_ok(struct device *dev, phys_addr_t phys, size_t size) +bool dma_coherent_ok(struct device *dev, phys_addr_t phys, size_t size) { return phys_to_dma_direct(dev, phys) + size - 1 <= min_not_zero(dev->coherent_dma_mask, dev->bus_dma_limit); -- 2.27.0