[+cc Christoph] On Thu, Nov 14, 2019 at 02:21:21PM +0530, Muni Sekhar wrote: > I’m using pci_alloc_consistent() in PCIe driver. My PCIe device only > works 64 bit data boundary transactions. > > Is there a way to make sure pci_alloc_consistent() always returns > 64-bit aligned address? See Documentation/DMA-API-HOWTO.txt. pci_alloc_consistent() is implemented in terms of dma_alloc_coherent(), and that doc says regions returned from dma_alloc_coherent() are guaranteed to be at least PAGE_SIZE-aligned. Are you seeing otherwise, or are you just making sure? The dma_pool interface for allocating smaller regions has a way to request the alignment you need. Bjorn
