From patchwork Tue Jan 15 13:22:55 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Joerg Roedel X-Patchwork-Id: 10764473 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 73F89139A for ; Tue, 15 Jan 2019 13:23:23 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 613682C0AC for ; Tue, 15 Jan 2019 13:23:23 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 54E3D2C0B6; Tue, 15 Jan 2019 13:23:23 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id DF4672C0AC for ; Tue, 15 Jan 2019 13:23:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729398AbfAONXC (ORCPT ); Tue, 15 Jan 2019 08:23:02 -0500 Received: from 8bytes.org ([81.169.241.247]:57748 "EHLO theia.8bytes.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729252AbfAONXB (ORCPT ); Tue, 15 Jan 2019 08:23:01 -0500 Received: by theia.8bytes.org (Postfix, from userid 1000) id 4682F1FC; Tue, 15 Jan 2019 14:23:00 +0100 (CET) From: Joerg Roedel To: "Michael S . Tsirkin" , Jason Wang , Konrad Rzeszutek Wilk , Christoph Hellwig Cc: Jens Axboe , virtualization@lists.linux-foundation.org, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org, jfehlig@suse.com, jon.grimm@amd.com, brijesh.singh@amd.com, joro@8bytes.org, jroedel@suse.de Subject: [PATCH 1/3] swiotlb: Introduce swiotlb_max_mapping_size() Date: Tue, 15 Jan 2019 14:22:55 +0100 Message-Id: <20190115132257.6426-2-joro@8bytes.org> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20190115132257.6426-1-joro@8bytes.org> References: <20190115132257.6426-1-joro@8bytes.org> Sender: linux-block-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Joerg Roedel The function returns the maximum size that can be remapped by the SWIOTLB implementation. This function will be later exposed to users through the DMA-API. Signed-off-by: Joerg Roedel --- include/linux/swiotlb.h | 5 +++++ kernel/dma/swiotlb.c | 5 +++++ 2 files changed, 10 insertions(+) diff --git a/include/linux/swiotlb.h b/include/linux/swiotlb.h index 7c007ed7505f..ceb623321f38 100644 --- a/include/linux/swiotlb.h +++ b/include/linux/swiotlb.h @@ -62,6 +62,7 @@ extern void swiotlb_tbl_sync_single(struct device *hwdev, extern int swiotlb_dma_supported(struct device *hwdev, u64 mask); +extern size_t swiotlb_max_mapping_size(struct device *dev); #ifdef CONFIG_SWIOTLB extern enum swiotlb_force swiotlb_force; @@ -95,6 +96,10 @@ static inline unsigned int swiotlb_max_segment(void) { return 0; } +static inline size_t swiotlb_max_mapping_size(struct device *dev) +{ + return SIZE_MAX; +} #endif /* CONFIG_SWIOTLB */ extern void swiotlb_print_info(void); diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c index d6361776dc5c..c950b3e9f683 100644 --- a/kernel/dma/swiotlb.c +++ b/kernel/dma/swiotlb.c @@ -660,3 +660,8 @@ swiotlb_dma_supported(struct device *hwdev, u64 mask) { return __phys_to_dma(hwdev, io_tlb_end - 1) <= mask; } + +size_t swiotlb_max_mapping_size(struct device *dev) +{ + return ((size_t)1 << IO_TLB_SHIFT) * IO_TLB_SEGSIZE; +}