From 466634488e80968f12e73dd1fe6af5c37a1fbfe2 Mon Sep 17 00:00:00 2001
From: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Date: Tue, 4 Mar 2008 14:29:28 -0800
Subject: iommu: parisc: make the IOMMUs respect the segment boundary limits

Make PARISC's two IOMMU implementations not allocate a memory area spanning
LLD's segment boundary.

[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Cc: Kyle McMartin <kyle@parisc-linux.org>
Cc: Matthew Wilcox <matthew@wil.cx>
Cc: Grant Grundler <grundler@parisc-linux.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
 drivers/parisc/ccio-dma.c | 23 ++++++++++++++++-------
 1 file changed, 16 insertions(+), 7 deletions(-)

(limited to 'drivers/parisc/ccio-dma.c')

diff --git a/drivers/parisc/ccio-dma.c b/drivers/parisc/ccio-dma.c
index 1695facfca3..60d338cd800 100644
--- a/drivers/parisc/ccio-dma.c
+++ b/drivers/parisc/ccio-dma.c
@@ -43,6 +43,7 @@
 #include <linux/proc_fs.h>
 #include <linux/seq_file.h>
 #include <linux/scatterlist.h>
+#include <linux/iommu-helper.h>
 
 #include <asm/byteorder.h>
 #include <asm/cache.h>		/* for L1_CACHE_BYTES */
@@ -302,13 +303,17 @@ static int ioc_count;
 */
 #define CCIO_SEARCH_LOOP(ioc, res_idx, mask, size)  \
        for(; res_ptr < res_end; ++res_ptr) { \
-               if(0 == (*res_ptr & mask)) { \
-                       *res_ptr |= mask; \
-                       res_idx = (unsigned int)((unsigned long)res_ptr - (unsigned long)ioc->res_map); \
-                       ioc->res_hint = res_idx + (size >> 3); \
-                       goto resource_found; \
-               } \
-       }
+		int ret;\
+		unsigned int idx;\
+		idx = (unsigned int)((unsigned long)res_ptr - (unsigned long)ioc->res_map); \
+		ret = iommu_is_span_boundary(idx << 3, pages_needed, 0, boundary_size);\
+		if ((0 == (*res_ptr & mask)) && !ret) { \
+			*res_ptr |= mask; \
+			res_idx = idx;\
+			ioc->res_hint = res_idx + (size >> 3); \
+			goto resource_found; \
+		} \
+	}
 
 #define CCIO_FIND_FREE_MAPPING(ioa, res_idx, mask, size) \
        u##size *res_ptr = (u##size *)&((ioc)->res_map[ioa->res_hint & ~((size >> 3) - 1)]); \
@@ -345,6 +350,7 @@ ccio_alloc_range(struct ioc *ioc, struct device *dev, size_t size)
 {
 	unsigned int pages_needed = size >> IOVP_SHIFT;
 	unsigned int res_idx;
+	unsigned long boundary_size;
 #ifdef CCIO_SEARCH_TIME
 	unsigned long cr_start = mfctl(16);
 #endif
@@ -360,6 +366,9 @@ ccio_alloc_range(struct ioc *ioc, struct device *dev, size_t size)
 	** ggg sacrifices another 710 to the computer gods.
 	*/
 
+	boundary_size = ALIGN(dma_get_seg_boundary(dev) + 1, 1 << IOVP_SHIFT);
+	boundary_size >>= IOVP_SHIFT;
+
 	if (pages_needed <= 8) {
 		/*
 		 * LAN traffic will not thrash the TLB IFF the same NIC
-- 
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