On Mon, 2025-12-01 at 11:38 -0800, Matthew Brost wrote: > On Mon, Dec 01, 2025 at 11:50:08AM +0100, Philipp Stanner wrote: > > Xe is one of the few users utilizing the return code of > > dma_fence_signal() to check whether a fence had already been signaled by > > someone else. > > > > To clean up and simplify the dma_fence API, the few kernel users relying > > on that behavior shall be ported to an alternative function. > > > > Replace dma_fence_signal_locked() with > > dma_fence_check_and_signal_locked(). > > > > Signed-off-by: Philipp Stanner <[email protected]> > > --- > > drivers/gpu/drm/xe/xe_hw_fence.c | 4 +--- > > 1 file changed, 1 insertion(+), 3 deletions(-) > > > > diff --git a/drivers/gpu/drm/xe/xe_hw_fence.c > > b/drivers/gpu/drm/xe/xe_hw_fence.c > > index b2a0c46dfcd4..f6057456e460 100644 > > --- a/drivers/gpu/drm/xe/xe_hw_fence.c > > +++ b/drivers/gpu/drm/xe/xe_hw_fence.c > > @@ -85,7 +85,6 @@ void xe_hw_fence_irq_finish(struct xe_hw_fence_irq *irq) > > { > > struct xe_hw_fence *fence, *next; > > unsigned long flags; > > - int err; > > bool tmp; > > > > if (XE_WARN_ON(!list_empty(&irq->pending))) { > > @@ -93,9 +92,8 @@ void xe_hw_fence_irq_finish(struct xe_hw_fence_irq *irq) > > spin_lock_irqsave(&irq->lock, flags); > > list_for_each_entry_safe(fence, next, &irq->pending, irq_link) { > > list_del_init(&fence->irq_link); > > - err = dma_fence_signal_locked(&fence->dma); > > + > > XE_WARN_ON(dma_fence_check_and_signal_locked(&fence->dma)); > > I think XE_WARN_ON can compile out in certain builds. Best to leave warn on > logic as is.
OK, will adjust. > > Also a little confused by this new helper... Doesn't > dma_fence_signal_locked already check if a fence is already signaled and > bail? Running out the door so I don't have time dig in here, but can you > explain? Yes, that is what dma_fence_signal_locked() *currently* does. The series, however, is about removing that check from the default interfaces because barely anyone uses dma_fence_signal() et.al.'s return code. To simplify the interfaces. The 2-3 users who need the code get this new function. See cover letter. P. > > Matt > > > dma_fence_put(&fence->dma); > > - XE_WARN_ON(err); > > } > > spin_unlock_irqrestore(&irq->lock, flags); > > dma_fence_end_signalling(tmp); > > -- > > 2.49.0 > >
