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Commit dc58e93a authored by Helge Deller's avatar Helge Deller Committed by Greg Kroah-Hartman
Browse files

parisc: Improve cache flushing for PCXL in arch_sync_dma_for_cpu() 



[ Upstream commit 59fa12646d9f56c842b4d5b6418ed77af625c588 ]

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: default avatarHelge Deller <deller@gmx.de>
Signed-off-by: default avatarSasha Levin <sashal@kernel.org>
parent da943564

arch/parisc/kernel/pci-dma.c

+17 −1
Original line number Diff line number Diff line
@@ -464,13 +464,29 @@ void arch_dma_free(struct device *dev, size_t size, void *vaddr, 
void arch_sync_dma_for_device(struct device *dev, phys_addr_t paddr,

		size_t size, enum dma_data_direction dir)

{

	/*

	 * fdc: The data cache line is written back to memory, if and only if

	 * it is dirty, and then invalidated from the data cache.

	 */

	flush_kernel_dcache_range((unsigned long)phys_to_virt(paddr), size);

}



void arch_sync_dma_for_cpu(struct device *dev, phys_addr_t paddr,

		size_t size, enum dma_data_direction dir)

{

	flush_kernel_dcache_range((unsigned long)phys_to_virt(paddr), size);

	unsigned long addr = (unsigned long) phys_to_virt(paddr);



	switch (dir) {

	case DMA_TO_DEVICE:

	case DMA_BIDIRECTIONAL:

		flush_kernel_dcache_range(addr, size);

		return;

	case DMA_FROM_DEVICE:

		purge_kernel_dcache_range_asm(addr, addr + size);

		return;

	default:

		BUG();

	}

}



void arch_dma_cache_sync(struct device *dev, void *vaddr, size_t size,