From patchwork Mon Feb 11 13:35:53 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 10805801 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 7DB90188E for ; Mon, 11 Feb 2019 13:37:05 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 6C8192A469 for ; Mon, 11 Feb 2019 13:37:05 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 5FD9C2A536; Mon, 11 Feb 2019 13:37:05 +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=-5.2 required=2.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI,SUSPICIOUS_RECIPS 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 87D512A4A4 for ; Mon, 11 Feb 2019 13:37:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728197AbfBKNgm (ORCPT ); Mon, 11 Feb 2019 08:36:42 -0500 Received: from bombadil.infradead.org ([198.137.202.133]:48764 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728162AbfBKNgl (ORCPT ); Mon, 11 Feb 2019 08:36:41 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.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:Resent-Date:Resent-From :Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help: List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=OU67UmqExT5dbDLu8bHDE6+Vl9G4BxqLG7kR2YT5wQI=; b=W2vhLnN19Nu13V50GW9LM4h7SK TAIijLeI2Oav5IYscoHoMxfCTZ1eJafL2K8N8c0nf5WlQrhJtdQNo1hhJWTVog/04KdDQ7e3mTLTr VUdnY810D7Xw0twecT62CXUjUV6k7PvHiLROOb0/z8708ETxYZxS285f+3KgHZV/AE0vr0JQuRCGy vGoec7KOGC/J78VJg6/9kE3/RXatw345O1ck6ub9EN4lanHAnVYwRzwcnvWpVOR1tby1LxMNrqLE8 zwVeeDoG8obcLKv40FcmXYAFqveX6d8i7+FhePlUk+/+hmpi/iM0Sa9r9DEHBFZ1a+pMLNyYFzyLS A5gDB3uw==; Received: from 089144210182.atnat0019.highway.a1.net ([89.144.210.182] helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.90_1 #2 (Red Hat Linux)) id 1gtBl7-0000Nh-SH; Mon, 11 Feb 2019 13:36:30 +0000 From: Christoph Hellwig To: iommu@lists.linux-foundation.org Cc: Greg Kroah-Hartman , Lee Jones , x86@kernel.org, linux-snps-arc@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-mips@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-sh@vger.kernel.org, linux-xtensa@linux-xtensa.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 11/12] dma-mapping: handle per-device coherent memory mmap in common code Date: Mon, 11 Feb 2019 14:35:53 +0100 Message-Id: <20190211133554.30055-12-hch@lst.de> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190211133554.30055-1-hch@lst.de> References: <20190211133554.30055-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Sender: linux-mips-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-mips@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP We handle allocation and freeing in common code, so we should handle mmap the same way. Also all users of per-device coherent memory are exclusive, that is if we can't allocate from the per-device pool we can't use the system memory either. Unfold the current dma_mmap_from_dev_coherent implementation and always use the per-device pool if it exists. Signed-off-by: Christoph Hellwig --- arch/arm/mm/dma-mapping-nommu.c | 7 ++-- arch/arm/mm/dma-mapping.c | 3 -- arch/arm64/mm/dma-mapping.c | 3 -- include/linux/dma-mapping.h | 11 ++----- kernel/dma/coherent.c | 58 ++++++++------------------------- kernel/dma/internal.h | 2 ++ kernel/dma/mapping.c | 8 ++--- 7 files changed, 24 insertions(+), 68 deletions(-) diff --git a/arch/arm/mm/dma-mapping-nommu.c b/arch/arm/mm/dma-mapping-nommu.c index c72f024f1e82..4eeb7e5d9c07 100644 --- a/arch/arm/mm/dma-mapping-nommu.c +++ b/arch/arm/mm/dma-mapping-nommu.c @@ -80,11 +80,8 @@ static int arm_nommu_dma_mmap(struct device *dev, struct vm_area_struct *vma, void *cpu_addr, dma_addr_t dma_addr, size_t size, unsigned long attrs) { - int ret; - - if (dma_mmap_from_global_coherent(vma, cpu_addr, size, &ret)) - return ret; - + if (!(attrs & DMA_ATTR_NON_CONSISTENT)) + return dma_mmap_from_global_coherent(vma, cpu_addr, size); return dma_common_mmap(dev, vma, cpu_addr, dma_addr, size, attrs); } diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c index 3c8534904209..e2993e5a7166 100644 --- a/arch/arm/mm/dma-mapping.c +++ b/arch/arm/mm/dma-mapping.c @@ -830,9 +830,6 @@ static int __arm_dma_mmap(struct device *dev, struct vm_area_struct *vma, unsigned long pfn = dma_to_pfn(dev, dma_addr); unsigned long off = vma->vm_pgoff; - if (dma_mmap_from_dev_coherent(dev, vma, cpu_addr, size, &ret)) - return ret; - if (off < nr_pages && nr_vma_pages <= (nr_pages - off)) { ret = remap_pfn_range(vma, vma->vm_start, pfn + off, diff --git a/arch/arm64/mm/dma-mapping.c b/arch/arm64/mm/dma-mapping.c index 78c0a72f822c..a55be91c1d1a 100644 --- a/arch/arm64/mm/dma-mapping.c +++ b/arch/arm64/mm/dma-mapping.c @@ -246,9 +246,6 @@ static int __iommu_mmap_attrs(struct device *dev, struct vm_area_struct *vma, vma->vm_page_prot = arch_dma_mmap_pgprot(dev, vma->vm_page_prot, attrs); - if (dma_mmap_from_dev_coherent(dev, vma, cpu_addr, size, &ret)) - return ret; - if (attrs & DMA_ATTR_FORCE_CONTIGUOUS) { /* * DMA_ATTR_FORCE_CONTIGUOUS allocations are always remapped, diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h index 018e37a0870e..ae6fe66f97b7 100644 --- a/include/linux/dma-mapping.h +++ b/include/linux/dma-mapping.h @@ -158,17 +158,12 @@ static inline int is_device_dma_capable(struct device *dev) * These three functions are only for dma allocator. * Don't use them in device drivers. */ -int dma_mmap_from_dev_coherent(struct device *dev, struct vm_area_struct *vma, - void *cpu_addr, size_t size, int *ret); - void *dma_alloc_from_global_coherent(size_t size, dma_addr_t *dma_handle); void dma_release_from_global_coherent(size_t size, void *vaddr); int dma_mmap_from_global_coherent(struct vm_area_struct *vma, void *cpu_addr, - size_t size, int *ret); + size_t size); #else -#define dma_mmap_from_dev_coherent(dev, vma, vaddr, order, ret) (0) - static inline void *dma_alloc_from_global_coherent(size_t size, dma_addr_t *dma_handle) { @@ -177,12 +172,10 @@ static inline void *dma_alloc_from_global_coherent(size_t size, static inline void dma_release_from_global_coherent(size_t size, void *vaddr) { - return 0; } static inline int dma_mmap_from_global_coherent(struct vm_area_struct *vma, - void *cpu_addr, size_t size, - int *ret) + void *cpu_addr, size_t size) { return 0; } diff --git a/kernel/dma/coherent.c b/kernel/dma/coherent.c index d1da1048e470..d7a27008f228 100644 --- a/kernel/dma/coherent.c +++ b/kernel/dma/coherent.c @@ -197,60 +197,30 @@ void dma_release_from_global_coherent(size_t size, void *vaddr) __dma_release_from_coherent(dma_coherent_default_memory, size, vaddr); } -static int __dma_mmap_from_coherent(struct dma_coherent_mem *mem, - struct vm_area_struct *vma, void *vaddr, size_t size, int *ret) +int __dma_mmap_from_coherent(struct dma_coherent_mem *mem, + struct vm_area_struct *vma, void *vaddr, size_t size) { - if (mem && vaddr >= mem->virt_base && vaddr + size <= - (mem->virt_base + (mem->size << PAGE_SHIFT))) { - unsigned long off = vma->vm_pgoff; - int start = (vaddr - mem->virt_base) >> PAGE_SHIFT; - int user_count = vma_pages(vma); - int count = PAGE_ALIGN(size) >> PAGE_SHIFT; - - *ret = -ENXIO; - if (off < count && user_count <= count - off) { - unsigned long pfn = mem->pfn_base + start + off; - *ret = remap_pfn_range(vma, vma->vm_start, pfn, - user_count << PAGE_SHIFT, - vma->vm_page_prot); - } - return 1; - } - return 0; -} + unsigned long off = vma->vm_pgoff; + int start = (vaddr - mem->virt_base) >> PAGE_SHIFT; + int user_count = vma_pages(vma); + int count = PAGE_ALIGN(size) >> PAGE_SHIFT; -/** - * dma_mmap_from_dev_coherent() - mmap memory from the device coherent pool - * @dev: device from which the memory was allocated - * @vma: vm_area for the userspace memory - * @vaddr: cpu address returned by dma_alloc_from_dev_coherent - * @size: size of the memory buffer allocated - * @ret: result from remap_pfn_range() - * - * This checks whether the memory was allocated from the per-device - * coherent memory pool and if so, maps that memory to the provided vma. - * - * Returns 1 if @vaddr belongs to the device coherent pool and the caller - * should return @ret, or 0 if they should proceed with mapping memory from - * generic areas. - */ -int dma_mmap_from_dev_coherent(struct device *dev, struct vm_area_struct *vma, - void *vaddr, size_t size, int *ret) -{ - struct dma_coherent_mem *mem = dev_get_coherent_memory(dev); - - return __dma_mmap_from_coherent(mem, vma, vaddr, size, ret); + if (WARN_ON_ONCE(!dma_in_coherent_range(mem, size, vaddr))) + return -ENXIO; + if (off >= count || user_count > count - off) + return -ENXIO; + return remap_pfn_range(vma, vma->vm_start, mem->pfn_base + start + off, + user_count << PAGE_SHIFT, vma->vm_page_prot); } -EXPORT_SYMBOL(dma_mmap_from_dev_coherent); int dma_mmap_from_global_coherent(struct vm_area_struct *vma, void *vaddr, - size_t size, int *ret) + size_t size) { if (!dma_coherent_default_memory) return 0; return __dma_mmap_from_coherent(dma_coherent_default_memory, vma, - vaddr, size, ret); + vaddr, size); } /* diff --git a/kernel/dma/internal.h b/kernel/dma/internal.h index 48a0a71487b1..651a0991777f 100644 --- a/kernel/dma/internal.h +++ b/kernel/dma/internal.h @@ -15,5 +15,7 @@ void *__dma_alloc_from_coherent(struct dma_coherent_mem *mem, size_t size, dma_addr_t *dma_handle); void __dma_release_from_coherent(struct dma_coherent_mem *mem, size_t size, void *vaddr); +int __dma_mmap_from_coherent(struct dma_coherent_mem *mem, + struct vm_area_struct *vma, void *vaddr, size_t size); #endif /* _DMA_INTERNAL_H */ diff --git a/kernel/dma/mapping.c b/kernel/dma/mapping.c index d3c4363b2143..5f28dc8f9bf4 100644 --- a/kernel/dma/mapping.c +++ b/kernel/dma/mapping.c @@ -158,13 +158,9 @@ int dma_common_mmap(struct device *dev, struct vm_area_struct *vma, unsigned long count = PAGE_ALIGN(size) >> PAGE_SHIFT; unsigned long off = vma->vm_pgoff; unsigned long pfn; - int ret = -ENXIO; vma->vm_page_prot = arch_dma_mmap_pgprot(dev, vma->vm_page_prot, attrs); - if (dma_mmap_from_dev_coherent(dev, vma, cpu_addr, size, &ret)) - return ret; - if (off >= count || user_count > count - off) return -ENXIO; @@ -201,6 +197,10 @@ int dma_mmap_attrs(struct device *dev, struct vm_area_struct *vma, unsigned long attrs) { const struct dma_map_ops *ops = get_dma_ops(dev); + struct dma_coherent_mem *mem = dev_get_coherent_memory(dev); + + if (mem) + return __dma_mmap_from_coherent(mem, vma, cpu_addr, size); if (!dma_is_direct(ops) && ops->mmap) return ops->mmap(dev, vma, cpu_addr, dma_addr, size, attrs);