diff options
| author | Scott Wood <scottwood@freescale.com> | 2014-08-08 18:40:44 -0500 |
|---|---|---|
| committer | Scott Wood <scottwood@freescale.com> | 2014-09-03 17:58:22 -0500 |
| commit | cf5621032fbe7354c0c3fff17958b7029bbc9f30 (patch) | |
| tree | 4500f41857757277438950e22d5950c4ae3a3784 /arch/powerpc/kernel/dma-swiotlb.c | |
| parent | 6397fc3fb05e73062b9790cfe2760e209ebd7b95 (diff) | |
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: Scott Wood <scottwood@freescale.com>
Cc: Shaohui Xie <Shaohui.Xie@freescale.com>
Diffstat (limited to 'arch/powerpc/kernel/dma-swiotlb.c')
| -rw-r--r-- | arch/powerpc/kernel/dma-swiotlb.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/arch/powerpc/kernel/dma-swiotlb.c b/arch/powerpc/kernel/dma-swiotlb.c index bd1a2aba599f..735979764cd4 100644 --- a/arch/powerpc/kernel/dma-swiotlb.c +++ b/arch/powerpc/kernel/dma-swiotlb.c @@ -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) |