kernel/linux.git/drivers/dma-buf/sw_sync.c, branch v7.0.10

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

dma-buf/sw-sync: always taint the kernel when sw-sync is used

2025-11-25T09:07:08+00:00

The SW-sync functionality should only be used for testing and debugging since it is inherently unsave. Signed-off-by: Christian König Acked-by: Sumit Semwal Link: https://lore.kernel.org/r/20251120150018.27385-3-christian.koenig@amd.com

dma-fence: Change signature of __dma_fence_is_later

2025-05-15T13:05:29+00:00

With the goal of reducing the need for drivers to touch (and dereference) fence->ops, we change the prototype of __dma_fence_is_later() to take fence instead of fence->ops. Signed-off-by: Tvrtko Ursulin Reviewed-by: Christian König Link: https://lore.kernel.org/r/20250515095004.28318-2-tvrtko.ursulin@igalia.com Signed-off-by: Christian König

BackMerge tag 'v6.15-rc5' into drm-next

2025-05-06T06:39:25+00:00

Linux 6.15-rc5, requested by tzimmerman for fixes required in drm-next. Signed-off-by: Dave Airlie

dma-buf/sw_sync: Decrement refcount on error in sw_sync_ioctl_get_deadline()

2025-04-11T12:22:22+00:00

Call dma_fence_put(fence) before returning an error if dma_fence_to_sync_pt() fails. Use an unwind ladder at the end of the function to do the cleanup. Fixes: 70e67aaec2f4 ("dma-buf/sw_sync: Add fence deadline support") Signed-off-by: Dan Carpenter Reviewed-by: Christian König Link: https://patchwork.freedesktop.org/patch/msgid/a010a1ac-107b-4fc0-a052-9fd3706ad690@stanley.mountain Signed-off-by: Christian König

dma-buf/dma-fence: remove unnecessary callbacks

2025-03-06T14:20:53+00:00

The fence_value_str and timeline_value_str callbacks were just an unnecessary abstraction in the SW sync implementation. The only caller of those callbacks already knew that the fence in questions is a timeline_fence. So print the values directly instead of using a redirection. Additional to that remove the implementations from virtgpu and vgem. As far as I can see those were never used in the first place. Signed-off-by: Christian König Reviewed-by: Simona Vetter Link: https://patchwork.freedesktop.org/patch/msgid/20250211163109.12200-3-christian.koenig@amd.com

dma-buf/sw_sync: remove pointless enable_signaling implementation

2024-10-09T12:23:17+00:00

Just returning true here is a no-op, remove the optional callback. Signed-off-by: Christian König Reviewed-by: Simona Vetter Link: https://patchwork.freedesktop.org/patch/msgid/20240911085903.1496-3-christian.koenig@amd.com

dma-buf/sw_sync: Add fence deadline support

2023-12-01T23:18:46+00:00

This consists of simply storing the most recent deadline, and adding an ioctl to retrieve the deadline. This can be used in conjunction with the SET_DEADLINE ioctl on a fence fd for testing. Ie. create various sw_sync fences, merge them into a fence-array, set deadline on the fence-array and confirm that it is propagated properly to each fence. v2: Switch UABI to express deadline as u64 v3: More verbose UAPI docs, show how to convert from timespec v4: Better comments, track the soonest deadline, as a normal fence implementation would, return an error if no deadline set. Signed-off-by: Rob Clark Reviewed-by: Christian König Acked-by: Pekka Paalanen Signed-off-by: Dmitry Baryshkov Link: https://patchwork.freedesktop.org/patch/msgid/20230823215458.203366-4-robdclark@gmail.com

dma-buf/sw_sync: Avoid recursive lock during fence signal

2023-08-23T08:22:49+00:00

If a signal callback releases the sw_sync fence, that will trigger a deadlock as the timeline_fence_release recurses onto the fence->lock (used both for signaling and the the timeline tree). To avoid that, temporarily hold an extra reference to the signalled fences until after we drop the lock. (This is an alternative implementation of https://patchwork.kernel.org/patch/11664717/ which avoids some potential UAF issues with the original patch.) v2: Remove now obsolete comment, use list_move_tail() and list_del_init() Reported-by: Bas Nieuwenhuizen Fixes: d3c6dd1fb30d ("dma-buf/sw_sync: Synchronize signal vs syncpt free") Signed-off-by: Rob Clark Link: https://patchwork.freedesktop.org/patch/msgid/20230818145939.39697-1-robdclark@gmail.com Reviewed-by: Christian König Signed-off-by: Christian König