From 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 Mon Sep 17 00:00:00 2001 From: Yunhong Jiang Date: Tue, 4 Aug 2015 12:17:53 -0700 Subject: Add the rt linux 4.1.3-rt3 as base Import the rt linux 4.1.3-rt3 as OPNFV kvm base. It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and the base is: commit 0917f823c59692d751951bf5ea699a2d1e2f26a2 Author: Sebastian Andrzej Siewior Date: Sat Jul 25 12:13:34 2015 +0200 Prepare v4.1.3-rt3 Signed-off-by: Sebastian Andrzej Siewior We lose all the git history this way and it's not good. We should apply another opnfv project repo in future. Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423 Signed-off-by: Yunhong Jiang --- kernel/lib/iommu-helper.c | 41 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 41 insertions(+) create mode 100644 kernel/lib/iommu-helper.c (limited to 'kernel/lib/iommu-helper.c') diff --git a/kernel/lib/iommu-helper.c b/kernel/lib/iommu-helper.c new file mode 100644 index 000000000..c27e26921 --- /dev/null +++ b/kernel/lib/iommu-helper.c @@ -0,0 +1,41 @@ +/* + * IOMMU helper functions for the free area management + */ + +#include +#include +#include + +int iommu_is_span_boundary(unsigned int index, unsigned int nr, + unsigned long shift, + unsigned long boundary_size) +{ + BUG_ON(!is_power_of_2(boundary_size)); + + shift = (shift + index) & (boundary_size - 1); + return shift + nr > boundary_size; +} + +unsigned long iommu_area_alloc(unsigned long *map, unsigned long size, + unsigned long start, unsigned int nr, + unsigned long shift, unsigned long boundary_size, + unsigned long align_mask) +{ + unsigned long index; + + /* We don't want the last of the limit */ + size -= 1; +again: + index = bitmap_find_next_zero_area(map, size, start, nr, align_mask); + if (index < size) { + if (iommu_is_span_boundary(index, nr, shift, boundary_size)) { + /* we could do more effectively */ + start = index + 1; + goto again; + } + bitmap_set(map, index, nr); + return index; + } + return -1; +} +EXPORT_SYMBOL(iommu_area_alloc); -- cgit 1.2.3-korg