powerpc: reserve iommu page 0

Message ID 1316524044-5260-1-git-send-email-cascardo@linux.vnet.ibm.com
State Accepted, archived
Headers show

Commit Message

Thadeu Lima de Souza Cascardo Sept. 20, 2011, 1:07 p.m.
Some devices have a dma-window that starts at the address 0. This allows
DMA addresses to be mapped to this address and returned to drivers as a
valid DMA address. Some drivers may not behave well in this case, since
the address 0 is considered an error or not allocated.

The solution to avoid this kind of error from happening is reserve the
page addressed as 0 so it cannot be allocated for a DMA mapping.

Ben Herrenschmidt deserves the credit for this patch. He pointed out the
solution and what code would do the job.

Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@linux.vnet.ibm.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: linuxppc-dev@lists.ozlabs.org
 arch/powerpc/kernel/iommu.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)


diff --git a/arch/powerpc/kernel/iommu.c b/arch/powerpc/kernel/iommu.c
index 961bb03..53411bc 100644
--- a/arch/powerpc/kernel/iommu.c
+++ b/arch/powerpc/kernel/iommu.c
@@ -501,6 +501,9 @@  struct iommu_table *iommu_init_table(struct iommu_table *tbl, int nid)
 	tbl->it_map = page_address(page);
 	memset(tbl->it_map, 0, sz);
+	if (tbl->it_offset == 0)
+		set_bit(0, tbl->it_map);
 	tbl->it_hint = 0;
 	tbl->it_largehint = tbl->it_halfpoint;