From: Dongwon Kim Date: Fri, 11 Jun 2021 21:21:07 +0000 (-0700) Subject: udmabuf: configurable list_limit and size_limit_mb X-Git-Tag: v5.15-rc1~148^2~23^2~146 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=2e717a55982affbf424b1ac2bf751201e3f4b19e;p=thirdparty%2Fkernel%2Flinux.git 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 Signed-off-by: Dongwon Kim Link: http://patchwork.freedesktop.org/patch/msgid/20210611212107.9876-1-dongwon.kim@intel.com Signed-off-by: Gerd Hoffmann --- diff --git a/drivers/dma-buf/udmabuf.c b/drivers/dma-buf/udmabuf.c index 1a79ce899b0f9..8df761a102511 100644 --- a/drivers/dma-buf/udmabuf.c +++ b/drivers/dma-buf/udmabuf.c @@ -13,8 +13,13 @@ #include #include -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;