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Commit 0b8698ab authored by Ian Campbell's avatar Ian Campbell Committed by Ingo Molnar
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swiotlb: range_needs_mapping should take a physical address. 



The swiotlb_arch_range_needs_mapping() hook should take a physical
address rather than a virtual address in order to support highmem pages.

Signed-off-by: default avatarIan Campbell <ian.campbell@citrix.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 0811a433

arch/x86/kernel/pci-swiotlb_64.c

+1 −1
Original line number Diff line number Diff line
@@ -33,7 +33,7 @@ phys_addr_t swiotlb_bus_to_phys(dma_addr_t baddr) 
	return baddr;

}



int __weak swiotlb_arch_range_needs_mapping(void *ptr, size_t size)

int __weak swiotlb_arch_range_needs_mapping(phys_addr_t paddr, size_t size)

{

	return 0;

}

include/linux/swiotlb.h

+1 −1
Original line number Diff line number Diff line
@@ -31,7 +31,7 @@ extern dma_addr_t swiotlb_phys_to_bus(struct device *hwdev, 
				      phys_addr_t address);

extern phys_addr_t swiotlb_bus_to_phys(dma_addr_t address);



extern int swiotlb_arch_range_needs_mapping(void *ptr, size_t size);

extern int swiotlb_arch_range_needs_mapping(phys_addr_t paddr, size_t size);



extern void

*swiotlb_alloc_coherent(struct device *hwdev, size_t size,

lib/swiotlb.c

+5 −5
Original line number Diff line number Diff line
@@ -145,7 +145,7 @@ static void *swiotlb_bus_to_virt(dma_addr_t address) 
	return phys_to_virt(swiotlb_bus_to_phys(address));

}



int __weak swiotlb_arch_range_needs_mapping(void *ptr, size_t size)

int __weak swiotlb_arch_range_needs_mapping(phys_addr_t paddr, size_t size)

{

	return 0;

}
@@ -315,9 +315,9 @@ address_needs_mapping(struct device *hwdev, dma_addr_t addr, size_t size) 
	return !is_buffer_dma_capable(dma_get_mask(hwdev), addr, size);

}



static inline int range_needs_mapping(void *ptr, size_t size)

static inline int range_needs_mapping(phys_addr_t paddr, size_t size)

{

	return swiotlb_force || swiotlb_arch_range_needs_mapping(ptr, size);

	return swiotlb_force || swiotlb_arch_range_needs_mapping(paddr, size);

}



static int is_swiotlb_buffer(char *addr)
@@ -653,7 +653,7 @@ dma_addr_t swiotlb_map_page(struct device *dev, struct page *page, 
	 * buffering it.

	 */

	if (!address_needs_mapping(dev, dev_addr, size) &&

	    !range_needs_mapping(ptr, size))

	    !range_needs_mapping(virt_to_phys(ptr), size))

		return dev_addr;



	/*
@@ -804,7 +804,7 @@ swiotlb_map_sg_attrs(struct device *hwdev, struct scatterlist *sgl, int nelems, 
		void *addr = sg_virt(sg);

		dma_addr_t dev_addr = swiotlb_virt_to_bus(hwdev, addr);



		if (range_needs_mapping(addr, sg->length) ||

		if (range_needs_mapping(sg_phys(sg), sg->length) ||

		    address_needs_mapping(hwdev, dev_addr, sg->length)) {

			void *map = map_single(hwdev, sg_phys(sg),

					       sg->length, dir);