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| author | Helge Deller <deller@gmx.de> | 2023-05-17 16:52:30 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-06-21 16:44:09 +0300 |
| commit | de873bce06a8bd196677832c7065a86fd287db79 (patch) | |
| tree | 9ae066490e2415993e2b02ad437f445693224f50 | |
| parent | 28850d25a62c5e304168e9c6c03fba61adbe6b5f (diff) | |
| download | linux-de873bce06a8bd196677832c7065a86fd287db79.tar.xz | |
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: Helge Deller <deller@gmx.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -rw-r--r-- | arch/parisc/kernel/pci-dma.c | 18 |
1 files changed, 17 insertions, 1 deletions
diff --git a/arch/parisc/kernel/pci-dma.c b/arch/parisc/kernel/pci-dma.c index a60d47fd4d55..1621f678aa05 100644 --- a/arch/parisc/kernel/pci-dma.c +++ b/arch/parisc/kernel/pci-dma.c @@ -442,13 +442,29 @@ void arch_dma_free(struct device *dev, size_t size, void *vaddr, void arch_sync_dma_for_device(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(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, |