From patchwork Thu Jun 20 08:50:07 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yoshihiro Shimoda X-Patchwork-Id: 11006159 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 F2A8C1986 for ; Thu, 20 Jun 2019 08:50:45 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id E552426861 for ; Thu, 20 Jun 2019 08:50:45 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id D98CD26D05; Thu, 20 Jun 2019 08:50:45 +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=unavailable 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 8EACD26E39 for ; Thu, 20 Jun 2019 08:50:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1725877AbfFTIuo (ORCPT ); Thu, 20 Jun 2019 04:50:44 -0400 Received: from relmlor1.renesas.com ([210.160.252.171]:21012 "EHLO relmlie5.idc.renesas.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726394AbfFTIuo (ORCPT ); Thu, 20 Jun 2019 04:50:44 -0400 X-IronPort-AV: E=Sophos;i="5.62,396,1554735600"; d="scan'208";a="19173846" Received: from unknown (HELO relmlir5.idc.renesas.com) ([10.200.68.151]) by relmlie5.idc.renesas.com with ESMTP; 20 Jun 2019 17:50:40 +0900 Received: from localhost.localdomain (unknown [10.166.17.210]) by relmlir5.idc.renesas.com (Postfix) with ESMTP id 6B600400C45E; Thu, 20 Jun 2019 17:50:40 +0900 (JST) From: Yoshihiro Shimoda To: ulf.hansson@linaro.org, hch@lst.de, m.szyprowski@samsung.com, robin.murphy@arm.com, joro@8bytes.org, axboe@kernel.dk Cc: wsa+renesas@sang-engineering.com, linux-mmc@vger.kernel.org, iommu@lists.linux-foundation.org, linux-block@vger.kernel.org, linux-renesas-soc@vger.kernel.org, Yoshihiro Shimoda Subject: [RFC PATCH v7 2/5] iommu/dma: Add a new dma_map_ops of get_merge_boundary() Date: Thu, 20 Jun 2019 17:50:07 +0900 Message-Id: <1561020610-953-3-git-send-email-yoshihiro.shimoda.uh@renesas.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1561020610-953-1-git-send-email-yoshihiro.shimoda.uh@renesas.com> References: <1561020610-953-1-git-send-email-yoshihiro.shimoda.uh@renesas.com> Sender: linux-mmc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-mmc@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP This patch adds a new dma_map_ops of get_merge_boundary() to expose the DMA merge boundary if the domain type is IOMMU_DOMAIN_DMA. Signed-off-by: Yoshihiro Shimoda --- drivers/iommu/dma-iommu.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c index 205d694..9950cb5 100644 --- a/drivers/iommu/dma-iommu.c +++ b/drivers/iommu/dma-iommu.c @@ -1091,6 +1091,16 @@ static int iommu_dma_get_sgtable(struct device *dev, struct sg_table *sgt, return ret; } +static unsigned long iommu_dma_get_merge_boundary(struct device *dev) +{ + struct iommu_domain *domain = iommu_get_dma_domain(dev); + + if (domain->type != IOMMU_DOMAIN_DMA) + return 0; /* can't merge */ + + return (1 << __ffs(domain->pgsize_bitmap)) - 1; +} + static const struct dma_map_ops iommu_dma_ops = { .alloc = iommu_dma_alloc, .free = iommu_dma_free, @@ -1106,6 +1116,7 @@ static const struct dma_map_ops iommu_dma_ops = { .sync_sg_for_device = iommu_dma_sync_sg_for_device, .map_resource = iommu_dma_map_resource, .unmap_resource = iommu_dma_unmap_resource, + .get_merge_boundary = iommu_dma_get_merge_boundary, }; /*