Default list_limit and size_limit_mb are not big enough to cover all
possible use cases. For example, list_limit could be well over its default,
1024 if only one or several pages are chained in all individual list entries
when creating dmabuf backed by >4MB buffer. list_limit and size_limit_mb are
now defined as module parameters so that those can be optionally configured
by root with proper values to remove these constraints.
Cc: Gerd Hoffmann <kraxel@xxxxxxxxxx>
Signed-off-by: Dongwon Kim <dongwon.kim@xxxxxxxxx>
---
drivers/dma-buf/udmabuf.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)
diff --git a/drivers/dma-buf/udmabuf.c b/drivers/dma-buf/udmabuf.c
index 1a79ce899b0f..8df761a10251 100644
--- a/drivers/dma-buf/udmabuf.c
+++ b/drivers/dma-buf/udmabuf.c
@@ -13,8 +13,13 @@
#include <linux/udmabuf.h>
#include <linux/hugetlb.h>
-static const u32 list_limit = 1024; /* udmabuf_create_list->count limit */
-static const size_t size_limit_mb = 64; /* total dmabuf size, in megabytes */
+static int list_limit = 1024;
+module_param(list_limit, int, 0644);
+MODULE_PARM_DESC(list_limit, "udmabuf_create_list->count limit. Default is 1024.");
+
+static int size_limit_mb = 64;
+module_param(size_limit_mb, int, 0644);
+MODULE_PARM_DESC(size_limit_mb, "Max size of a dmabuf, in megabytes. Default is 64.");
struct udmabuf {
pgoff_t pagecount;
--
2.20.1
