kernel/linux.git/drivers/dma-buf/sync_file.c, branch v7.0-rc7

Convert 'alloc_obj' family to use the new default GFP_KERNEL argument

2026-02-22T01:09:51+00:00

This was done entirely with mindless brute force, using git grep -l '\

treewide: Replace kmalloc with kmalloc_obj for non-scalar types

2026-02-21T09:02:28+00:00

This is the result of running the Coccinelle script from scripts/coccinelle/api/kmalloc_objs.cocci. The script is designed to avoid scalar types (which need careful case-by-case checking), and instead replace kmalloc-family calls that allocate struct or union object instances: Single allocations: kmalloc(sizeof(TYPE), ...) are replaced with: kmalloc_obj(TYPE, ...) Array allocations: kmalloc_array(COUNT, sizeof(TYPE), ...) are replaced with: kmalloc_objs(TYPE, COUNT, ...) Flex array allocations: kmalloc(struct_size(PTR, FAM, COUNT), ...) are replaced with: kmalloc_flex(*PTR, FAM, COUNT, ...) (where TYPE may also be *VAR) The resulting allocations no longer return "void *", instead returning "TYPE *". Signed-off-by: Kees Cook

sync_file: Protect access to driver and timeline name

2025-06-13T07:24:12+00:00

Protect the access to driver and timeline name which otherwise could be freed as dma-fence exported is signalling fences. This prepares the code for incoming dma-fence API changes which will start asserting these accesses are done from a RCU locked section. Signed-off-by: Tvrtko Ursulin Reviewed-by: Christian König Signed-off-by: Tvrtko Ursulin Link: https://lore.kernel.org/r/20250610164226.10817-2-tvrtko.ursulin@igalia.com

sync_file: Use dma-fence driver and timeline name helpers

2025-06-03T16:38:37+00:00

Access the dma-fence internals via the previously added helpers. Signed-off-by: Tvrtko Ursulin Reviewed-by: Christian König Signed-off-by: Tvrtko Ursulin Link: https://lore.kernel.org/r/20250515095004.28318-5-tvrtko.ursulin@igalia.com

dma-buf/sync_file: Add SET_DEADLINE ioctl

2023-12-01T23:17:48+00:00

The initial purpose is for igt tests, but this would also be useful for compositors that wait until close to vblank deadline to make decisions about which frame to show. The igt tests can be found at: https://gitlab.freedesktop.org/robclark/igt-gpu-tools/-/commits/fence-deadline v2: Clarify the timebase, add link to igt tests v3: Use u64 value in ns to express deadline. v4: More doc Signed-off-by: Rob Clark Acked-by: Pekka Paalanen Signed-off-by: Dmitry Baryshkov Link: https://patchwork.freedesktop.org/patch/msgid/20230823215458.203366-3-robdclark@gmail.com

dma-buf: add dma_fence_timestamp helper

2023-11-01T02:24:10+00:00

When a fence signals there is a very small race window where the timestamp isn't updated yet. sync_file solves this by busy waiting for the timestamp to appear, but on other ocassions didn't handled this correctly. Provide a dma_fence_timestamp() helper function for this and use it in all appropriate cases. Another alternative would be to grab the spinlock when that happens. v2 by teddy: add a wait parameter to wait for the timestamp to show up, in case the accurate timestamp is needed and/or the timestamp is not based on ktime (e.g. hw timestamp) v3 chk: drop the parameter again for unified handling Signed-off-by: Yunxiang Li Signed-off-by: Christian König Fixes: 1774baa64f93 ("drm/scheduler: Change scheduled fence track v2") Reviewed-by: Alex Deucher CC: stable@vger.kernel.org Link: https://patchwork.freedesktop.org/patch/msgid/20230929104725.2358-1-christian.koenig@amd.com

dma-buf/sync_file: use strscpy to replace strlcpy

2022-08-10T11:50:49+00:00

The strlcpy should not be used because it doesn't limit the source length. Preferred is strscpy. Signed-off-by: XueBing Chen Signed-off-by: Daniel Vetter Link: https://patchwork.freedesktop.org/patch/msgid/6aad3bff.d1a.181b982d1b1.Coremail.chenxuebing@jari.cn

dma-buf: generalize dma_fence unwrap & merging v3

2022-05-30T12:24:04+00:00

Introduce a dma_fence_unwrap_merge() macro which allows to unwrap fences which potentially can be containers as well and then merge them back together into a flat dma_fence_array. v2: rename the function, add some more comments about how the wrapper is used, move filtering of signaled fences into the unwrap iterator, add complex selftest which covers more cases. v3: fix signaled fence filtering once more Signed-off-by: Christian König Reviewed-by: Daniel Vetter Link: https://patchwork.freedesktop.org/patch/msgid/20220518135844.3338-5-christian.koenig@amd.com

dma-buf/sync_file: cleanup fence merging a bit

2022-05-04T10:09:53+00:00

krealloc_array() ignores attempts to reduce the array size, so the attempt to save memory is completely pointless here. Also move testing for the no fence case into sync_file_set_fence(), this way we don't even touch the fence array when we don't have any fences. Signed-off-by: Christian König Reviewed-by: Daniel Vetter Link: https://patchwork.freedesktop.org/patch/msgid/20220426124637.329764-1-christian.koenig@amd.com

dma-buf/sync-file: fix logic error in new fence merge code

2022-03-29T07:14:10+00:00

When the array is empty because everything is signaled we can't use add_fence() to add something because that would filter the signaled fence again. Signed-off-by: Christian König Fixes: 519f490db07e ("dma-buf/sync-file: fix warning about fence containers") Reviewed-by: Thomas Hellström Link: https://patchwork.freedesktop.org/patch/msgid/20220329070001.134180-1-christian.koenig@amd.com