diff options
| author |   Dongwon Kim <dongwon.kim@intel.com> | 2021-06-11 14:21:07 -0700 |
|---|---|---|
| committer |   Gerd Hoffmann <kraxel@redhat.com> | 2021-06-23 12:11:59 +0200 |
| commit | 2e717a55982affbf424b1ac2bf751201e3f4b19e (patch) | |
| tree | 3bf28f9b3222d0d4bf02e21deb2c6664ab71aec5 /drivers/dma-buf | |
| parent | dma-buf: Document non-dynamic exporter expectations better (diff) | |
| download | linux-dev-2e717a55982affbf424b1ac2bf751201e3f4b19e.tar.xz linux-dev-2e717a55982affbf424b1ac2bf751201e3f4b19e.zip | |
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.c | 9 |
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; |