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[RFC,1/2] swiotlb-xen: implement xen_swiotlb_dma_mmap callback

Message ID 1484066667-12160-2-git-send-email-andrii.anisov@gmail.com (mailing list archive)
State New, archived
Headers show

Commit Message

Andrii Anisov Jan. 10, 2017, 4:44 p.m. UTC 
From: Stefano Stabellini <stefano.stabellini@eu.citrix.com>

This function creates userspace mapping for the DMA-coherent memory.

Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Signed-off-by: Oleksandr Dmytryshyn <oleksandr.dmytryshyn@globallogic.com>
Signed-off-by: Andrii Anisov <andrii_anisov@epam.com>
---
 arch/arm/xen/mm.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)
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Patch

diff --git a/arch/arm/xen/mm.c b/arch/arm/xen/mm.c
index c5f9a9e..050cf34 100644
--- a/arch/arm/xen/mm.c
+++ b/arch/arm/xen/mm.c
@@ -163,6 +163,19 @@  bool xen_arch_need_swiotlb(struct device *dev,
 		!is_device_dma_coherent(dev));
 }
 
+/*
+ * Create userspace mapping for the DMA-coherent memory.
+ */
+static int xen_swiotlb_dma_mmap(struct device *dev, struct vm_area_struct *vma,
+			 void *cpu_addr, dma_addr_t dma_addr, size_t size,
+			 struct dma_attrs *attrs)
+{
+	if (__generic_dma_ops(dev)->mmap)
+		return __generic_dma_ops(dev)->mmap(dev, vma, cpu_addr, dma_addr, size, attrs);
+
+	return dma_common_mmap(dev, vma, cpu_addr, dma_addr, size);
+}
+
 int xen_create_contiguous_region(phys_addr_t pstart, unsigned int order,
 				 unsigned int address_bits,
 				 dma_addr_t *dma_handle)
@@ -199,6 +212,7 @@  static struct dma_map_ops xen_swiotlb_dma_ops = {
 	.unmap_page = xen_swiotlb_unmap_page,
 	.dma_supported = xen_swiotlb_dma_supported,
 	.set_dma_mask = xen_swiotlb_set_dma_mask,
+	.mmap = xen_swiotlb_dma_mmap,
 };
 
 int __init xen_mm_init(void)