xen: Add __GFP_DMA flag when xen_swiotlb_init gets free pages on ARM
Make sure that xen_swiotlb_init allocates buffers that are DMA capable when at least one memblock is available below 4G. Otherwise we assume that all devices on the SoC can cope with >4G addresses. We do this on ARM and ARM64, where dom0 is mapped 1:1, so pfn == mfn in this case. No functional changes on x86. From: Chen Baozi <baozich@gmail.com> Signed-off-by: Chen Baozi <baozich@gmail.com> Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Tested-by: Chen Baozi <baozich@gmail.com> Acked-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Signed-off-by: David Vrabel <david.vrabel@citrix.com>
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@ -110,5 +110,6 @@ static inline bool set_phys_to_machine(unsigned long pfn, unsigned long mfn)
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bool xen_arch_need_swiotlb(struct device *dev,
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unsigned long pfn,
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unsigned long mfn);
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unsigned long xen_get_swiotlb_free_pages(unsigned int order);
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#endif /* _ASM_ARM_XEN_PAGE_H */
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@ -4,6 +4,7 @@
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#include <linux/gfp.h>
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#include <linux/highmem.h>
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#include <linux/export.h>
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#include <linux/memblock.h>
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#include <linux/of_address.h>
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#include <linux/slab.h>
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#include <linux/types.h>
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@ -21,6 +22,20 @@
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#include <asm/xen/hypercall.h>
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#include <asm/xen/interface.h>
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unsigned long xen_get_swiotlb_free_pages(unsigned int order)
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{
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struct memblock_region *reg;
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gfp_t flags = __GFP_NOWARN;
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for_each_memblock(memory, reg) {
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if (reg->base < (phys_addr_t)0xffffffff) {
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flags |= __GFP_DMA;
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break;
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}
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}
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return __get_free_pages(flags, order);
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}
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enum dma_cache_op {
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DMA_UNMAP,
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DMA_MAP,
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@ -269,4 +269,9 @@ static inline bool xen_arch_need_swiotlb(struct device *dev,
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return false;
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}
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static inline unsigned long xen_get_swiotlb_free_pages(unsigned int order)
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{
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return __get_free_pages(__GFP_NOWARN, order);
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}
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#endif /* _ASM_X86_XEN_PAGE_H */
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@ -235,7 +235,7 @@ retry:
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#define SLABS_PER_PAGE (1 << (PAGE_SHIFT - IO_TLB_SHIFT))
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#define IO_TLB_MIN_SLABS ((1<<20) >> IO_TLB_SHIFT)
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while ((SLABS_PER_PAGE << order) > IO_TLB_MIN_SLABS) {
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xen_io_tlb_start = (void *)__get_free_pages(__GFP_NOWARN, order);
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xen_io_tlb_start = (void *)xen_get_swiotlb_free_pages(order);
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if (xen_io_tlb_start)
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break;
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order--;
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