Commit 69369f52 authored by Andrii Anisov's avatar Andrii Anisov Committed by Konrad Rzeszutek Wilk
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swiotlb-xen: implement xen_swiotlb_get_sgtable callback 



Signed-off-by: default avatarAndrii Anisov <andrii_anisov@epam.com>
Signed-off-by: default avatarStefano Stabellini <sstabellini@kernel.org>
Signed-off-by: default avatarKonrad Rzeszutek Wilk <konrad@kernel.org>
parent 7e91c7df

arch/arm/xen/mm.c

+1 −0
Original line number Diff line number Diff line
@@ -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)

drivers/xen/swiotlb-xen.c

+28 −0
Original line number Diff line number Diff line
@@ -699,3 +699,31 @@ 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);



/*

 * This function should be called with the pages from the current domain only,

 * passing pages mapped from other domains would lead to memory corruption.

 */

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) {

#if 0

	/*

	 * This check verifies that the page belongs to the current domain and

	 * is not one mapped from another domain.

	 * This check is for debug only, and should not go to production build

	 */

		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);

include/xen/swiotlb-xen.h

+6 −0
Original line number Diff line number Diff line
@@ -2,6 +2,7 @@ 
#define __LINUX_SWIOTLB_XEN_H



#include <linux/dma-direction.h>

#include <linux/scatterlist.h>

#include <linux/swiotlb.h>



extern int xen_swiotlb_init(int verbose, bool early);
@@ -60,4 +61,9 @@ 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 */