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MIPS: loongson: remove loongson_dma_supported 

swiotlb_dma_supported will always return true for a mask large enough to
cover the DMA addresses for all physical memory, which is the right
thing to do for swiotlb based dma ops.  This function returned false
if the mask was bigger than a firmware set dma_mask_bits that apparently
can be either 32 or 64, and which seems completely buggys if it actually
is not 64, as the false return negates the whole point of swiotlb.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Patchwork: https://patchwork.linux-mips.org/patch/19533/
Signed-off-by: Paul Burton <paul.burton@mips.com>
Cc: Florian Fainelli <f.fainelli@gmail.com>
Cc: David Daney <david.daney@cavium.com>
Cc: Kevin Cernekee <cernekee@gmail.com>
Cc: Jiaxun Yang <jiaxun.yang@flygoat.com>
Cc: Tom Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Huacai Chen <chenhc@lemote.com>
Cc: iommu@lists.linux-foundation.org
Cc: linux-mips@linux-mips.org
This commit is contained in:
Christoph Hellwig 2018-06-15 13:08:35 +02:00 committed by Paul Burton
parent 97f9f9763a
commit e799de3efb
No known key found for this signature in database
GPG Key ID: 3EA79FACB57500DD
1 changed files with 1 additions and 8 deletions
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9
arch/mips/loongson64/common/dma-swiotlb.c
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@ -56,13 +56,6 @@ static void loongson_dma_sync_sg_for_device(struct device *dev,
mb();
}
static int loongson_dma_supported(struct device *dev, u64 mask)
{
if (mask > DMA_BIT_MASK(loongson_sysconf.dma_mask_bits))
return 0;
return swiotlb_dma_supported(dev, mask);
}
dma_addr_t __phys_to_dma(struct device *dev, phys_addr_t paddr)
{
long nid;
@ -99,7 +92,7 @@ static const struct dma_map_ops loongson_dma_map_ops = {
.sync_sg_for_cpu = swiotlb_sync_sg_for_cpu,
.sync_sg_for_device = loongson_dma_sync_sg_for_device,
.mapping_error = swiotlb_dma_mapping_error,
.dma_supported = loongson_dma_supported,
.dma_supported = swiotlb_dma_supported,
};
void __init plat_swiotlb_setup(void)