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

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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: Scott Wood <scottwood@freescale.com>
Cc: Shaohui Xie <Shaohui.Xie@freescale.com>
This commit is contained in:
Scott Wood 2014-08-08 18:40:44 -05:00
parent 6397fc3fb0
commit cf5621032f
1 changed files with 6 additions and 2 deletions
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8
arch/powerpc/kernel/dma-swiotlb.c
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@ -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)