rk: ion: shows the maximum allocated memory

diff --git a/drivers/staging/android/ion/ion.c b/drivers/staging/android/ion/ion.c
index 21df3c4516bda040309e9d57977d499977976a65..38d3f494ecbf122e525a91e587c01a09e9a1a6a9 100755 (executable)
--- a/drivers/staging/android/ion/ion.c
+++ b/drivers/staging/android/ion/ion.c
@@ -2030,6 +2030,29 @@ void __init ion_reserve(struct ion_platform_data *data)
 }
 
 #ifdef CONFIG_ION_ROCKCHIP_SNAPSHOT
+
+// Find the maximum can be allocated memory
+static unsigned long ion_find_max_zero_area(unsigned long *map, unsigned long size)
+{
+       unsigned long index, i, zero_sz, max_zero_sz, start;
+       start = 0;
+       max_zero_sz = 0;
+
+       do {
+               index = find_next_zero_bit(map, size, start);
+               if (index>=size) break;
+
+               i = find_next_bit(map, size, index);
+               zero_sz = i-index;
+               pr_debug("zero[%lx, %lx]\n", index, zero_sz);
+               max_zero_sz = max(max_zero_sz, zero_sz);
+               start = i + 1;
+       } while(start<=size);
+
+       pr_debug("max_zero_sz=%lx\n", max_zero_sz);
+       return max_zero_sz;
+}
+
 int ion_snapshot_save(struct ion_device *idev)
 {
        static struct seq_file seqf;
@@ -2053,9 +2076,16 @@ int ion_snapshot_save(struct ion_device *idev)
                seq_printf(&seqf, "++++++++++++++++ HEAP: %s ++++++++++++++++\n",
                        heap->name);
                ion_debug_heap_show(&seqf, NULL);
-//             seq_printf(&seqf, "\n");
-//             if (ION_HEAP_TYPE_DMA==heap->type)
-//                     ion_cma_heap_debug_show(&seqf, NULL);
+               if (ION_HEAP_TYPE_DMA==heap->type) {
+                       struct ion_cma_heap *cma_heap = container_of(heap,
+                                                                       struct ion_cma_heap,
+                                                                       heap);
+                       struct cma *cma = dev_get_cma_area(cma_heap->dev);
+                       seq_printf(&seqf, "\n");
+                       seq_printf(&seqf, "Maximum allocation of pages: %ld\n",
+                                       ion_find_max_zero_area(cma->bitmap, cma->count));
+                       seq_printf(&seqf, "\n");
+               }
        }
 
        for (n = rb_first(&idev->clients); n; n = rb_next(n)) {