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dma-buf/udmabuf: Disable the size limit by default

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As udmabuf increasingly enjoys popularity - being used in projects like
libcamera, Gstreamer, Mesa, KWin and Weston - users more frequently
encounter cases where the current default size limit of 64MB is too low.
Examples include allocating video buffers at a 8K resolution - and even 4K
is affected when using non-subsampled video formats and high bit depths.

In its current form the size limit for individual buffers does not seem to
provide any additional level of protection - such as limiting the amount of
memory a process can pin - as the later can just allocate multiple buffers.
If additional guardrails are desired, they would likely require some kind
accounting not limited to individual buffers.

Therefor let's disable the size limit by default by setting it to the
maximal possible value, INT_MAX.

Signed-off-by: Robert Mader <robert.mader@collabora.com>
Acked-by: Vivek Kasireddy <vivek.kasireddy@intel.com>
Link: https://lore.kernel.org/dri-devel/20260711144814.8205-1-robert.mader@collabora.com/
Link: https://lore.kernel.org/dri-devel/6764ca6f-b4d8-4baa-9d27-2ca867ac2d41@amd.com/
Signed-off-by: Vivek Kasireddy <vivek.kasireddy@intel.com>
Link: https://patch.msgid.link/20260722110145.36641-1-robert.mader@collabora.com
This commit is contained in:
Robert Mader
2026-07-22 13:01:45 +02:00
committed by Vivek Kasireddy
parent 6ed8d820ce
commit 44e9eb5a76
1 changed files with 2 additions and 2 deletions
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4
drivers/dma-buf/udmabuf.c
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@@ -20,9 +20,9 @@ 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;
static int size_limit_mb = INT_MAX;
module_param(size_limit_mb, int, 0644);
MODULE_PARM_DESC(size_limit_mb, "Max size of a dmabuf, in megabytes. Default is 64.");
MODULE_PARM_DESC(size_limit_mb, "Max size of a dmabuf, in megabytes. Default is INT_MAX.");
struct udmabuf {
pgoff_t pagecount;