On Mon, 2015-03-09 at 20:11 +0900, Tomasz Figa wrote:
<...>

quoted

+/*
+ * pimudev is a global var for dma_alloc_coherent.
+ * It is not accepatable, we will delete it if "domain_alloc" is enabled
+ */
+static struct device *pimudev;

This is indeed not acceptable. Could you replace dma_alloc_coherent()
with something that doesn't require device pointer, e.g.
alloc_pages()? (Although that would require you to handle cache
maintenance in the driver, due to cached memory allocated.) I need to
think about a better solution for this.

Hi,

For 2nd level page table, we use cached memory now. Currently we are
using __dma_flush_range to flush the cache, which is also unacceptable.

For proper cache management, we'll need to use dma_map_single or
dma_sync_*, which still need a deivce*.

Joe.C