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parisc: Improve cache flushing for PCXL in arch_sync_dma_for_cpu()
[ Upstream commit 59fa12646d
]
Add comment in arch_sync_dma_for_device() and handle the direction flag in
arch_sync_dma_for_cpu().
When receiving data from the device (DMA_FROM_DEVICE) unconditionally
purge the data cache in arch_sync_dma_for_cpu().
Signed-off-by: Helge Deller <deller@gmx.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
parent
c278adeebc
commit
0d6fbe2383
1 changed files with 17 additions and 1 deletions
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@ -446,11 +446,27 @@ void arch_dma_free(struct device *dev, size_t size, void *vaddr,
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void arch_sync_dma_for_device(phys_addr_t paddr, size_t size,
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enum dma_data_direction dir)
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{
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/*
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* fdc: The data cache line is written back to memory, if and only if
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* it is dirty, and then invalidated from the data cache.
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*/
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flush_kernel_dcache_range((unsigned long)phys_to_virt(paddr), size);
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}
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void arch_sync_dma_for_cpu(phys_addr_t paddr, size_t size,
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enum dma_data_direction dir)
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{
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flush_kernel_dcache_range((unsigned long)phys_to_virt(paddr), size);
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unsigned long addr = (unsigned long) phys_to_virt(paddr);
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switch (dir) {
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case DMA_TO_DEVICE:
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case DMA_BIDIRECTIONAL:
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flush_kernel_dcache_range(addr, size);
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return;
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case DMA_FROM_DEVICE:
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purge_kernel_dcache_range_asm(addr, addr + size);
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return;
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default:
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BUG();
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}
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}
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