From: Anton Blanchard <anton@samba.org>
To: torvalds@osdl.org
Cc: akpm@osdl.org, paulus@samba.org, olof@austin.ibm.com,
linux-kernel@vger.kernel.org
Subject: [PATCH] [ppc64] bump IOMMU_MAX_ORDER
Date: Tue, 25 May 2004 15:27:19 +1000 [thread overview]
Message-ID: <20040525052719.GF3893@krispykreme> (raw)
Hi,
We have cards that want over 2MB of PCI consistent memory. The
IOMAP_MAX_ORDER limit is just to catch bad drivers early, so we can bump
this a bit.
We want some room to grow but our maximum get_free_pages allocation on
ppc64 is currently 16MB, so it doesnt make sense to go above that.
Signed-off-by: Anton Blanchard <anton@samba.org>
===== include/asm-ppc64/iommu.h 1.6 vs edited =====
--- 1.6/include/asm-ppc64/iommu.h Tue Apr 13 03:54:09 2004
+++ edited/include/asm-ppc64/iommu.h Tue May 25 15:16:24 2004
@@ -29,10 +29,10 @@
/*
* IOMAP_MAX_ORDER defines the largest contiguous block
- * of dma (tce) space we can get. IOMAP_MAX_ORDER = 10
- * allows up to 2**9 pages (512 * 4096) = 2 MB
+ * of dma (tce) space we can get. IOMAP_MAX_ORDER = 13
+ * allows up to 2**12 pages (4096 * 4096) = 16 MB
*/
-#define IOMAP_MAX_ORDER 10
+#define IOMAP_MAX_ORDER 13
/*
* Tces come in two formats, one for the virtual bus and a different
reply other threads:[~2004-05-25 5:28 UTC|newest]
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