[Xen-devel] [PATCH v3 2/2] swiotlb-xen: implement xen_swiotlb_get_sgtable callback

[Andrii Anisov <andrii.anisov@xxxxxxxxx>]

From: Andrii Anisov <andrii_anisov@xxxxxxxx>

Signed-off-by: Andrii Anisov <andrii_anisov@xxxxxxxx>
Signed-off-by: Stefano Stabellini <sstabellini@xxxxxxxxxx>
---
 arch/arm/xen/mm.c         |  1 +
 drivers/xen/swiotlb-xen.c | 22 ++++++++++++++++++++++
 include/xen/swiotlb-xen.h |  6 ++++++
 3 files changed, 29 insertions(+)

diff --git a/arch/arm/xen/mm.c b/arch/arm/xen/mm.c
index cd1684e..76ea48a 100644
--- a/arch/arm/xen/mm.c
+++ b/arch/arm/xen/mm.c
@@ -199,6 +199,7 @@ static struct dma_map_ops xen_swiotlb_dma_ops = {
        .dma_supported = xen_swiotlb_dma_supported,
        .set_dma_mask = xen_swiotlb_set_dma_mask,
        .mmap = xen_swiotlb_dma_mmap,
+       .get_sgtable = xen_swiotlb_get_sgtable,
 };
 
 int __init xen_mm_init(void)
diff --git a/drivers/xen/swiotlb-xen.c b/drivers/xen/swiotlb-xen.c
index 8ac36b4..a809d43 100644
--- a/drivers/xen/swiotlb-xen.c
+++ b/drivers/xen/swiotlb-xen.c
@@ -699,3 +699,25 @@ xen_swiotlb_dma_mmap(struct device *dev, struct 
vm_area_struct *vma,
        return dma_common_mmap(dev, vma, cpu_addr, dma_addr, size);
 }
 EXPORT_SYMBOL_GPL(xen_swiotlb_dma_mmap);
+
+/*
+ * Following function should be called with the local pages only.
+ */
+int
+xen_swiotlb_get_sgtable(struct device *dev, struct sg_table *sgt,
+                       void *cpu_addr, dma_addr_t handle, size_t size,
+                       unsigned long attrs)
+{
+#if defined(CONFIG_ARM) || defined(CONFIG_ARM64)
+       if (__generic_dma_ops(dev)->get_sgtable) {
+#ifdef DEBUG
+               unsigned long bfn = PHYS_PFN(dma_to_phys(dev, handle));
+               BUG_ON (!page_is_ram(bfn));
+#endif
+               return __generic_dma_ops(dev)->get_sgtable(dev, sgt, cpu_addr,
+                                                          handle, size, attrs);
+       }
+#endif
+       return dma_common_get_sgtable(dev, sgt, cpu_addr, handle, size);
+}
+EXPORT_SYMBOL_GPL(xen_swiotlb_get_sgtable);
diff --git a/include/xen/swiotlb-xen.h b/include/xen/swiotlb-xen.h
index 5c8f4c8..c554c23 100644
--- a/include/xen/swiotlb-xen.h
+++ b/include/xen/swiotlb-xen.h
@@ -60,4 +60,10 @@ extern int
 xen_swiotlb_dma_mmap(struct device *dev, struct vm_area_struct *vma,
                        void *cpu_addr, dma_addr_t dma_addr, size_t size,
                        unsigned long attrs);
+
+extern int
+xen_swiotlb_get_sgtable(struct device *dev, struct sg_table *sgt,
+                       void *cpu_addr, dma_addr_t handle, size_t size,
+                       unsigned long attrs);
+
 #endif /* __LINUX_SWIOTLB_XEN_H */
-- 
2.7.4


_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxx
https://lists.xen.org/xen-devel