From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751832AbdBOKBe (ORCPT ); Wed, 15 Feb 2017 05:01:34 -0500 Received: from foss.arm.com ([217.140.101.70]:53234 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751285AbdBOKAS (ORCPT ); Wed, 15 Feb 2017 05:00:18 -0500 From: Vladimir Murzin To: linux-arm-kernel@lists.infradead.org Cc: kbuild-all@01.org, linux@armlinux.org.uk, robin.murphy@arm.com, akpm@linux-foundation.org, linux-kernel@vger.kernel.org, Joerg Roedel , Christian Borntraeger Subject: [PATCH 2/7] dma: Add simple dma_noop_mmap Date: Wed, 15 Feb 2017 09:59:47 +0000 Message-Id: <1487152792-34214-3-git-send-email-vladimir.murzin@arm.com> X-Mailer: git-send-email 2.0.0 In-Reply-To: <1487152792-34214-1-git-send-email-vladimir.murzin@arm.com> References: <1487152792-34214-1-git-send-email-vladimir.murzin@arm.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This patch adds a simple implementation of mmap to dma_noop_ops. Cc: Joerg Roedel Cc: Christian Borntraeger Reported-by: Benjamin Gaignard Tested-by: Benjamin Gaignard Tested-by: Andras Szemzo Tested-by: Alexandre TORGUE Signed-off-by: Vladimir Murzin --- lib/dma-noop.c | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) diff --git a/lib/dma-noop.c b/lib/dma-noop.c index a14eee5..70504eb 100644 --- a/lib/dma-noop.c +++ b/lib/dma-noop.c @@ -66,6 +66,26 @@ static int dma_noop_supported(struct device *dev, u64 mask) return 1; } +static int dma_noop_mmap(struct device *dev, struct vm_area_struct *vma, + void *cpu_addr, dma_addr_t dma_addr, size_t size, + unsigned long attrs) +{ + unsigned long user_count = vma_pages(vma); + unsigned long count = PAGE_ALIGN(size) >> PAGE_SHIFT; + unsigned long pfn = page_to_pfn(virt_to_page(cpu_addr)); + unsigned long off = vma->vm_pgoff; + int ret = -ENXIO; + + if (off < count && user_count <= (count - off)) { + ret = remap_pfn_range(vma, vma->vm_start, + pfn + off, + user_count << PAGE_SHIFT, + vma->vm_page_prot); + } + + return ret; +} + struct dma_map_ops dma_noop_ops = { .alloc = dma_noop_alloc, .free = dma_noop_free, @@ -73,6 +93,7 @@ struct dma_map_ops dma_noop_ops = { .map_sg = dma_noop_map_sg, .mapping_error = dma_noop_mapping_error, .dma_supported = dma_noop_supported, + .mmap = dma_noop_mmap, }; EXPORT_SYMBOL(dma_noop_ops); -- 2.0.0