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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>
This commit is contained in:
Dongwon Kim 2021-06-11 14:21:07 -07:00 committed by Gerd Hoffmann
parent 89bcadc8f9
commit 2e717a5598
1 changed files with 7 additions and 2 deletions
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9
drivers/dma-buf/udmabuf.c
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@ -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;