mm: cma: align to physical address, not CMA region position

The alignment in cma_alloc() was done w.r.t. the bitmap.  This is a
problem when, for example:

- a device requires 16M (order 12) alignment
- the CMA region is not 16 M aligned

In such a case, can result with the CMA region starting at, say,
0x2f800000 but any allocation you make from there will be aligned from
there.  Requesting an allocation of 32 M with 16 M alignment will result
in an allocation from 0x2f800000 to 0x31800000, which doesn't work very
well if your strange device requires 16M alignment.

Change to use bitmap_find_next_zero_area_off() to account for the
difference in alignment at reserve-time and alloc-time.

Signed-off-by: Gregory Fong <gregory.0xf0@gmail.com>
Acked-by: Michal Nazarewicz <mina86@mina86.com>
Cc: Marek Szyprowski <m.szyprowski@samsung.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Kukjin Kim <kgene.kim@samsung.com>
Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Cc: Laura Abbott <lauraa@codeaurora.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 16 insertions, 3 deletions

diff --git a/mm/cma.c b/mm/cma.c
index 8e9ec13d31db..5c96d7a3ba9c 100644
--- a/mm/cma.c
+++ b/mm/cma.c
@@ -63,6 +63,17 @@ static unsigned long cma_bitmap_aligned_mask(struct cma *cma, int align_order)
         return (1UL << (align_order - cma->order_per_bit)) - 1;
 }
 
+static unsigned long cma_bitmap_aligned_offset(struct cma *cma, int align_order)
+{
+        unsigned int alignment;
+
+        if (align_order <= cma->order_per_bit)
+                return 0;
+        alignment = 1UL << (align_order - cma->order_per_bit);
+        return ALIGN(cma->base_pfn, alignment) -
+                (cma->base_pfn >> cma->order_per_bit);
+}
+
 static unsigned long cma_bitmap_maxno(struct cma *cma)
 {
         return cma->count >> cma->order_per_bit;
@@ -340,7 +351,7 @@ err:
  */
 struct page *cma_alloc(struct cma *cma, int count, unsigned int align)
 {
-        unsigned long mask, pfn, start = 0;
+        unsigned long mask, offset, pfn, start = 0;
         unsigned long bitmap_maxno, bitmap_no, bitmap_count;
         struct page *page = NULL;
         int ret;
@@ -355,13 +366,15 @@ struct page *cma_alloc(struct cma *cma, int count, unsigned int align)
                 return NULL;
 
         mask = cma_bitmap_aligned_mask(cma, align);
+        offset = cma_bitmap_aligned_offset(cma, align);
         bitmap_maxno = cma_bitmap_maxno(cma);
         bitmap_count = cma_bitmap_pages_to_bits(cma, count);
 
         for (;;) {
                 mutex_lock(&cma->lock);
-                bitmap_no = bitmap_find_next_zero_area(cma->bitmap,
-                                bitmap_maxno, start, bitmap_count, mask);
+                bitmap_no = bitmap_find_next_zero_area_off(cma->bitmap,
+                                bitmap_maxno, start, bitmap_count, mask,
+                                offset);
                 if (bitmap_no >= bitmap_maxno) {
                         mutex_unlock(&cma->lock);
                         break;