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From: Christoph Hellwig <hch@lst.de>
To: iommu@lists.linux-foundation.org
Cc: Robin Murphy <robin.murphy@arm.com>,
	Vineet Gupta <vgupta@synopsys.com>,
	"Matwey V. Kornilov" <matwey@sai.msu.ru>,
	Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
	linux-snps-arc@lists.infradead.org,
	Ezequiel Garcia <ezequiel@collabora.com>,
	linux-media@vger.kernel.org, linux-arm-kernel@vger.kernel.org,
	dri-devel@lists.freedesktop.org, sparclinux@vger.kernel.org,
	openrisc@lists.librecores.org, linux-parisc@vger.kernel.org,
	linux-mips@vger.kernel.org
Subject: [PATCH 03/10] arm64/iommu: implement support for DMA_ATTR_NON_CONSISTENT
Date: Sat,  8 Dec 2018 09:36:55 -0800	[thread overview]
Message-ID: <20181208173702.15158-4-hch@lst.de> (raw)
In-Reply-To: <20181208173702.15158-1-hch@lst.de>

DMA_ATTR_NON_CONSISTENT forces contiguous allocations as we don't
want to remap, and is otherwise forced down the same pass as if we
were always on a coherent device.  No new code required except for
a few conditionals.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 arch/arm64/mm/dma-mapping.c | 18 +++++++++++-------
 1 file changed, 11 insertions(+), 7 deletions(-)

diff --git a/arch/arm64/mm/dma-mapping.c b/arch/arm64/mm/dma-mapping.c
index d39b60113539..0010688ca30e 100644
--- a/arch/arm64/mm/dma-mapping.c
+++ b/arch/arm64/mm/dma-mapping.c
@@ -240,7 +240,8 @@ static void *__iommu_alloc_attrs(struct device *dev, size_t size,
 				dma_free_from_pool(addr, size);
 			addr = NULL;
 		}
-	} else if (attrs & DMA_ATTR_FORCE_CONTIGUOUS) {
+	} else if (attrs & (DMA_ATTR_FORCE_CONTIGUOUS |
+			DMA_ATTR_NON_CONSISTENT)) {
 		pgprot_t prot = arch_dma_mmap_pgprot(dev, PAGE_KERNEL, attrs);
 		struct page *page;
 
@@ -256,7 +257,7 @@ static void *__iommu_alloc_attrs(struct device *dev, size_t size,
 			return NULL;
 		}
 
-		if (coherent) {
+		if (coherent || (attrs & DMA_ATTR_NON_CONSISTENT)) {
 			memset(addr, 0, size);
 			return addr;
 		}
@@ -309,7 +310,8 @@ static void __iommu_free_attrs(struct device *dev, size_t size, void *cpu_addr,
 	if (dma_in_atomic_pool(cpu_addr, size)) {
 		iommu_dma_unmap_page(dev, handle, iosize, 0, 0);
 		dma_free_from_pool(cpu_addr, size);
-	} else if (attrs & DMA_ATTR_FORCE_CONTIGUOUS) {
+	} else if (attrs & (DMA_ATTR_FORCE_CONTIGUOUS |
+			DMA_ATTR_NON_CONSISTENT)) {
 		struct page *page = vmalloc_to_page(cpu_addr);
 
 		iommu_dma_unmap_page(dev, handle, iosize, 0, attrs);
@@ -342,10 +344,11 @@ static int __iommu_mmap_attrs(struct device *dev, struct vm_area_struct *vma,
 	if (dma_mmap_from_dev_coherent(dev, vma, cpu_addr, size, &ret))
 		return ret;
 
-	if (attrs & DMA_ATTR_FORCE_CONTIGUOUS) {
+	if (attrs & (DMA_ATTR_FORCE_CONTIGUOUS | DMA_ATTR_NON_CONSISTENT)) {
 		unsigned long pfn;
 
-		if (dev_is_dma_coherent(dev))
+		if (dev_is_dma_coherent(dev) ||
+		    (attrs & DMA_ATTR_NON_CONSISTENT))
 			pfn = virt_to_pfn(cpu_addr);
 		else
 			pfn = vmalloc_to_pfn(cpu_addr);
@@ -366,10 +369,11 @@ static int __iommu_get_sgtable(struct device *dev, struct sg_table *sgt,
 	unsigned int count = PAGE_ALIGN(size) >> PAGE_SHIFT;
 	struct vm_struct *area = find_vm_area(cpu_addr);
 
-	if (attrs & DMA_ATTR_FORCE_CONTIGUOUS) {
+	if (attrs & (DMA_ATTR_FORCE_CONTIGUOUS | DMA_ATTR_NON_CONSISTENT)) {
 		struct page *page;
 
-		if (dev_is_dma_coherent(dev))
+		if (dev_is_dma_coherent(dev) ||
+		    (attrs & DMA_ATTR_NON_CONSISTENT))
 			page = virt_to_page(cpu_addr);
 		else
 			page = vmalloc_to_page(cpu_addr);
-- 
2.19.2


  parent reply	other threads:[~2018-12-08 17:37 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-12-08 17:36 make the non-consistent DMA allocator more userful Christoph Hellwig
2018-12-08 17:36 ` [PATCH 01/10] dma-direct: provide a generic implementation of DMA_ATTR_NON_CONSISTENT Christoph Hellwig
2018-12-08 17:36 ` [PATCH 02/10] arm64/iommu: don't remap contiguous allocations for coherent devices Christoph Hellwig
2018-12-10 19:19   ` Robin Murphy
2018-12-10 19:25     ` Christoph Hellwig
2018-12-08 17:36 ` Christoph Hellwig [this message]
2018-12-08 17:36 ` [PATCH 04/10] arm: implement DMA_ATTR_NON_CONSISTENT Christoph Hellwig
2018-12-08 22:52   ` Ezequiel Garcia
2018-12-10 19:16     ` Christoph Hellwig
2018-12-08 17:36 ` [PATCH 05/10] sparc64/iommu: move code around a bit Christoph Hellwig
2018-12-09  4:58   ` David Miller
2018-12-08 17:36 ` [PATCH 06/10] sparc64/iommu: implement DMA_ATTR_NON_CONSISTENT Christoph Hellwig
2018-12-09  4:58   ` David Miller
2018-12-08 17:36 ` [PATCH 07/10] sparc64/pci_sun4v: move code around a bit Christoph Hellwig
2018-12-09  4:58   ` David Miller
2018-12-08 17:37 ` [PATCH 08/10] sparc64/pci_sun4v: implement DMA_ATTR_NON_CONSISTENT Christoph Hellwig
2018-12-09  4:58   ` David Miller
2018-12-08 17:37 ` [PATCH 09/10] dma-mapping: skip declared coherent memory for DMA_ATTR_NON_CONSISTENT Christoph Hellwig
2018-12-08 17:37 ` [PATCH 10/10] Documentation: update the description " Christoph Hellwig

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