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Commit cf562103 authored by Scott Wood's avatar Scott Wood
Browse files

powerpc/64: Limit ZONE_DMA32 to 4GiB in swiotlb_detect_4g() 



A DMA zone is still needed with swiotlb, for coherent allocations.
This doesn't affect platforms that don't use swiotlb or that don't call
swiotlb_detect_4g().

Signed-off-by: default avatarScott Wood <scottwood@freescale.com>
Cc: Shaohui Xie <Shaohui.Xie@freescale.com>
parent 6397fc3f

arch/powerpc/kernel/dma-swiotlb.c

+6 −2
Original line number Diff line number Diff line
@@ -106,10 +106,14 @@ int __init swiotlb_setup_bus_notifier(void) 
	return 0;

}



void swiotlb_detect_4g(void)

void __init swiotlb_detect_4g(void)

{

	if ((memblock_end_of_DRAM() - 1) > 0xffffffff)

	if ((memblock_end_of_DRAM() - 1) > 0xffffffff) {

		ppc_swiotlb_enable = 1;

#ifdef CONFIG_ZONE_DMA32

		limit_zone_pfn(ZONE_DMA32, (1ULL << 32) >> PAGE_SHIFT);

#endif

	}

}



static int __init swiotlb_late_init(void)