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authorDongwon Kim <dongwon.kim@intel.com>2021-06-11 14:21:07 -0700
committerGerd Hoffmann <kraxel@redhat.com>2021-06-23 12:11:59 +0200
commit2e717a55982affbf424b1ac2bf751201e3f4b19e (patch)
tree3bf28f9b3222d0d4bf02e21deb2c6664ab71aec5 /drivers/dma-buf
parent89bcadc8f94bd6e6361b5c803ec6f40132e8bace (diff)
udmabuf: configurable list_limit and size_limit_mb
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@redhat.com> Signed-off-by: Dongwon Kim <dongwon.kim@intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/20210611212107.9876-1-dongwon.kim@intel.com Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Diffstat (limited to 'drivers/dma-buf')
-rw-r--r--drivers/dma-buf/udmabuf.c9
1 files 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;