Re: DMA mapping (was Re: [PATCH] cciss 2.6; replaces DMA masks with kernel defines)

[Lee Revell <rlrevell@joe-job.com>]

On Sat, 2005-06-11 at 14:54 +0100, Matthew Wilcox wrote:
> On Fri, Jun 10, 2005 at 07:08:11PM -0400, Lee Revell wrote:
> > Should I just add everything from 24 to 63?
> 
> Actually, it'd be useful to have a central list of what DMA masks devices
> really take.  It might provide some arguments for changing the zone allocater.
> 

OK, patch attached.  I don't have time to cover every case, maybe
someone else can run with this.

Lee

Summary: Add DMA mask constants other than 32 and 64 bit

Signed-Off-By: Lee Revell <rlrevell@joe-job.com>

--- linux-2.6.12-rc5-k7/include/linux/dma-mapping.h-orig	2005-06-15 14:14:04.000000000 -0400
+++ linux-2.6.12-rc5-k7/include/linux/dma-mapping.h	2005-06-15 14:17:13.000000000 -0400
@@ -14,7 +14,12 @@
 };
 
 #define DMA_64BIT_MASK	0xffffffffffffffffULL
+#define DMA_40BIT_MASK	0x000000ffffffffffULL
+#define DMA_39BIT_MASK	0x0000007fffffffffULL
 #define DMA_32BIT_MASK	0x00000000ffffffffULL
+#define DMA_31BIT_MASK	0x000000007fffffffULL
+#define DMA_30BIT_MASK	0x000000003fffffffULL
+#define DMA_29BIT_MASK	0x000000001fffffffULL
 
 #include <asm/dma-mapping.h>