From: Chris Metcalf <cmetcalf@tilera.com>
Date: Mon, 5 Aug 2013 17:40:47 +0000 (-0400)
Subject: tile PCI RC: add dma_get_required_mask()
X-Git-Tag: v3.12-rc1~120^2~63
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=dc7d5cf2cab6d1fbb43c5c0569f43b7e4c822760;p=pandora-kernel.git

tile PCI RC: add dma_get_required_mask()

The standard kernel function dma_get_required_mask() uses the
highest DRAM address to determine if 32-bit or 64-bit DMA addressing
is needed.  This only works on architectures that have direct mapping
between the PA and the PCI address space, i.e. those that don't have
I/O TLBs or have I/O TLB but choose to use direct mapping.  Neither
of these are true for tilegx.  Whether to use 64-bit DMA should depend
on the PCI device's capability only, not on the amount of DRAM
installeds, so we now advertise a 64-bit DMA mask unconditionally.

Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
---

Reading git-diff-tree failed