On Mon, Apr 18, 2016 at 09:06:18AM -0400, ok...@codeaurora.org wrote: > On 2016-04-18 08:12, Christoph Hellwig wrote: > >On Sat, Apr 16, 2016 at 06:23:32PM -0400, Sinan Kaya wrote: > >>Current code is assuming that the address returned by dma_alloc_coherent > >>is a logical address. This is not true on ARM/ARM64 systems. > > > >Can you explain what you mean with a 'logical address' and what actual > >issue you're trying to solve? > > Vmap call is failing on arm64 systems because dma alloc api already returns > an address mapped with vmap.
Please state your problem clearly. What I'm reverse engineering from your posts is: because dma_alloc_coherent uses vmap-like mappings on arm64 (all, some systems?) a driver using a lot of them might run into limits of the vmap pool size. Is this correct? > > Please see arch/arm64/mm directory. ---end quoted text---
