introduce generic iommu_num_pages function

This patch introduces the generic iommu_num_pages function. It can be used by
a given memory area.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Richard Henderson <rth@twiddle.net>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Cc: Muli Ben-Yehuda <muli@il.ibm.com>
Cc: Dave Airlie <airlied@linux.ie>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/include/linux/iommu-helper.h b/include/linux/iommu-helper.h
index a6d0586e2bf76227488045e7e38267a3f69bc455..3b068e5b56710222f43bd86a3a5f849128526171 100644 (file)
--- a/include/linux/iommu-helper.h
+++ b/include/linux/iommu-helper.h
@@ -23,4 +23,7 @@ extern unsigned long iommu_area_alloc(unsigned long *map, unsigned long size,
 extern void iommu_area_free(unsigned long *map, unsigned long start,
                            unsigned int nr);
 
+extern unsigned long iommu_num_pages(unsigned long addr, unsigned long len,
+                                    unsigned long io_page_size);
+
 #endif

diff --git a/lib/iommu-helper.c b/lib/iommu-helper.c
index 5d90074dca7550f4935e71127911441c9bc617e2..75dbda03f4fb99a92ef8cc3ead817afefd707702 100644 (file)
--- a/lib/iommu-helper.c
+++ b/lib/iommu-helper.c
@@ -79,3 +79,12 @@ void iommu_area_free(unsigned long *map, unsigned long start, unsigned int nr)
        }
 }
 EXPORT_SYMBOL(iommu_area_free);
+
+unsigned long iommu_num_pages(unsigned long addr, unsigned long len,
+                             unsigned long io_page_size)
+{
+       unsigned long size = (addr & (io_page_size - 1)) + len;
+
+       return DIV_ROUND_UP(size, io_page_size);
+}
+EXPORT_SYMBOL(iommu_num_pages);