diff options
| author | Robin Murphy <robin.murphy@arm.com> | 2017-01-16 14:24:55 +0100 |
|---|---|---|
| committer | Joerg Roedel <jroedel@suse.de> | 2017-01-30 16:14:24 +0100 |
| commit | 122fac030e912ed723fe94d8eb0d5d0f6b31535e (patch) | |
| tree | ddfdbf1d6725f348ece0fffe7dc839077c32cc5a /arch/arm64/mm/dma-mapping.c | |
| parent | iommu/dma: Stop getting dma_32bit_pfn wrong (diff) | |
| download | linux-122fac030e912ed723fe94d8eb0d5d0f6b31535e.tar.xz linux-122fac030e912ed723fe94d8eb0d5d0f6b31535e.zip | |
iommu/dma: Implement PCI allocation optimisation
Whilst PCI devices may have 64-bit DMA masks, they still benefit from
using 32-bit addresses wherever possible in order to avoid DAC (PCI) or
longer address packets (PCIe), which may incur a performance overhead.
Implement the same optimisation as other allocators by trying to get a
32-bit address first, only falling back to the full mask if that fails.
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'arch/arm64/mm/dma-mapping.c')
0 files changed, 0 insertions, 0 deletions