From patchwork Thu Jan 28 14:58:36 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 12053917 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=-16.7 required=3.0 tests=BAYES_00,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_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 E516CC433DB for ; Thu, 28 Jan 2021 15:07:10 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B8AD164DFD for ; Thu, 28 Jan 2021 15:07:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232172AbhA1PE6 (ORCPT ); Thu, 28 Jan 2021 10:04:58 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50430 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232277AbhA1PEO (ORCPT ); Thu, 28 Jan 2021 10:04:14 -0500 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E027DC0613ED; Thu, 28 Jan 2021 07:03:33 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; 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=6h4Clr4yrvyrSY276Nk233XB/1n9S2aGkvEz85NFWNA=; b=KfBRW4pI01u3GQvXdslcgMQsFG sCoM1TdFacyc8bszZAac77VCZKXVRdPuDZlW65VRprx8eYIU/4utKN9SW27AmrmtDIdQEng5F/Hdm Tmltejx0op3G56rXsv5mr+Wsa02HmrlLpUUM8dlwkMExhgOBfjcLGZmqzpukHZfi9ZMqQT8arwC3L NUoM13BC6tdhS/qajuSokdhi9DQfyVECgJ8dZWZXx8xKpepCKc162PfXUzk+pYdH5HbbmIE0VWrki FeWeR0ZarhpB/ej+t4Ey060Qjaw/QuI3v3WLnJGUS1oDUEfAVxrhnLha655P0nu6X0DRb7N8A0LtR ER4pjXZA==; Received: from [2001:4bb8:18c:25a3:5b32:95f:aa1f:ea4] (helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.94 #2 (Red Hat Linux)) id 1l58pK-008bLO-3x; Thu, 28 Jan 2021 15:03:19 +0000 From: Christoph Hellwig To: Mauro Carvalho Chehab , Marek Szyprowski , Tomasz Figa , Ricardo Ribalda , Sergey Senozhatsky , iommu@lists.linux-foundation.org Cc: Robin Murphy , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org Subject: [PATCH 5/6] dma-iommu: implement ->alloc_noncontiguous Date: Thu, 28 Jan 2021 15:58:36 +0100 Message-Id: <20210128145837.2250561-6-hch@lst.de> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20210128145837.2250561-1-hch@lst.de> References: <20210128145837.2250561-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org Implement support for allocating a non-contiguous DMA region. Signed-off-by: Christoph Hellwig --- drivers/iommu/dma-iommu.c | 47 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 47 insertions(+) diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c index 65af875ba8495c..938a2856b4a455 100644 --- a/drivers/iommu/dma-iommu.c +++ b/drivers/iommu/dma-iommu.c @@ -756,6 +756,49 @@ static void *iommu_dma_alloc_remap(struct device *dev, size_t size, return NULL; } +#ifdef CONFIG_DMA_REMAP +static struct sg_table *iommu_dma_alloc_noncontiguous(struct device *dev, + size_t size, dma_addr_t *dma_handle, + enum dma_data_direction dir, gfp_t gfp) +{ + unsigned long count = PAGE_ALIGN(size) >> PAGE_SHIFT; + struct dma_sgt_handle *sh; + + sh = kmalloc(sizeof(*sh), gfp); + if (!sh) + return NULL; + + sh->pages = __iommu_dma_alloc_noncontiguous(dev, size, &sh->sgt, + dma_handle, gfp, + PAGE_KERNEL, 0); + if (!sh->pages) + goto out_free_sh; + + if (sg_alloc_table_from_pages(&sh->sgt, sh->pages, count, 0, size, + GFP_KERNEL)) + goto out_free_pages; + + return &sh->sgt; + +out_free_pages: + __iommu_dma_free_pages(sh->pages, count); +out_free_sh: + kfree(sh); + return NULL; +} + +static void iommu_dma_free_noncontiguous(struct device *dev, size_t size, + struct sg_table *sgt, dma_addr_t dma_handle, + enum dma_data_direction dir) +{ + struct dma_sgt_handle *sh = sgt_handle(sgt); + + __iommu_dma_unmap(dev, dma_handle, size); + __iommu_dma_free_pages(sh->pages, PAGE_ALIGN(size) >> PAGE_SHIFT); + sg_free_table(&sh->sgt); +} +#endif /* CONFIG_DMA_REMAP */ + static void iommu_dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle, size_t size, enum dma_data_direction dir) { @@ -1271,6 +1314,10 @@ static const struct dma_map_ops iommu_dma_ops = { .free = iommu_dma_free, .alloc_pages = dma_common_alloc_pages, .free_pages = dma_common_free_pages, +#ifdef CONFIG_DMA_REMAP + .alloc_noncontiguous = iommu_dma_alloc_noncontiguous, + .free_noncontiguous = iommu_dma_free_noncontiguous, +#endif .mmap = iommu_dma_mmap, .get_sgtable = iommu_dma_get_sgtable, .map_page = iommu_dma_map_page,