Linaro-mm-sig

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Re: [PATCH] dma-buf/dma_fence_array: remove unused functionality

by Christian König

On 3/18/26 10:51, Tvrtko Ursulin wrote: > > On 17/03/2026 14:50, Christian König wrote: >> Amdgpu was the only user of the signal on any feature and we dropped >> that use case recently, so we can remove that functionality again. >> >> This allows to simplfy the dma_fence_array code a lot and saves us from > > simplify > >> the need to install a callback on all fences at the same time. >> >> Signed-off-by: Christian König <christian.koenig(a)amd.com> >> --- >> drivers/dma-buf/dma-fence-array.c | 133 +++++++----------- >> drivers/dma-buf/dma-fence-unwrap.c | 3 +- >> drivers/dma-buf/dma-resv.c | 3 +- >> drivers/dma-buf/st-dma-fence-unwrap.c | 2 +- >> .../gpu/drm/i915/gem/i915_gem_execbuffer.c | 3 +- >> drivers/gpu/drm/xe/xe_sync.c | 2 +- >> drivers/gpu/drm/xe/xe_vm.c | 4 +- >> include/linux/dma-fence-array.h | 28 +--- >> 8 files changed, 63 insertions(+), 115 deletions(-) >> >> diff --git a/drivers/dma-buf/dma-fence-array.c b/drivers/dma-buf/dma-fence-array.c >> index 089f69469524..0d54bf2e47ba 100644 >> --- a/drivers/dma-buf/dma-fence-array.c >> +++ b/drivers/dma-buf/dma-fence-array.c >> @@ -42,97 +42,71 @@ static void dma_fence_array_clear_pending_error(struct dma_fence_array *array) >> cmpxchg(&array->base.error, PENDING_ERROR, 0); >> } >> -static void irq_dma_fence_array_work(struct irq_work *wrk) >> +static void dma_fence_array_cb_func(struct dma_fence *f, >> + struct dma_fence_cb *cb) >> { >> - struct dma_fence_array *array = container_of(wrk, typeof(*array), work); >> + struct dma_fence_array *array = >> + container_of(cb, struct dma_fence_array, callback); >> - dma_fence_array_clear_pending_error(array); >> - >> - dma_fence_signal(&array->base); >> - dma_fence_put(&array->base); >> + irq_work_queue(&array->work); >> } >> -static void dma_fence_array_cb_func(struct dma_fence *f, >> - struct dma_fence_cb *cb) >> +static void irq_dma_fence_array_work(struct irq_work *wrk) >> { >> - struct dma_fence_array_cb *array_cb = >> - container_of(cb, struct dma_fence_array_cb, cb); >> - struct dma_fence_array *array = array_cb->array; >> + struct dma_fence_array *array = container_of(wrk, typeof(*array), work); >> - dma_fence_array_set_pending_error(array, f->error); >> + while (array->num_pending--) { >> + struct dma_fence *f = array->fences[array->num_pending]; >> - if (atomic_dec_and_test(&array->num_pending)) >> - irq_work_queue(&array->work); >> - else >> - dma_fence_put(&array->base); >> + if (!dma_fence_add_callback(f, &array->callback, >> + dma_fence_array_cb_func)) >> + return; >> + >> + dma_fence_array_set_pending_error(array, f->error); >> + } >> + >> + dma_fence_signal(&array->base); >> + dma_fence_put(&array->base); >> } >> static bool dma_fence_array_enable_signaling(struct dma_fence *fence) >> { >> struct dma_fence_array *array = to_dma_fence_array(fence); >> - struct dma_fence_array_cb *cb = array->callbacks; >> - unsigned i; >> - >> - for (i = 0; i < array->num_fences; ++i) { >> - cb[i].array = array; >> - /* >> - * As we may report that the fence is signaled before all >> - * callbacks are complete, we need to take an additional >> - * reference count on the array so that we do not free it too >> - * early. The core fence handling will only hold the reference >> - * until we signal the array as complete (but that is now >> - * insufficient). >> - */ >> - dma_fence_get(&array->base); >> - if (dma_fence_add_callback(array->fences[i], &cb[i].cb, >> - dma_fence_array_cb_func)) { >> - int error = array->fences[i]->error; >> - >> - dma_fence_array_set_pending_error(array, error); >> - dma_fence_put(&array->base); >> - if (atomic_dec_and_test(&array->num_pending)) { >> - dma_fence_array_clear_pending_error(array); >> - return false; >> - } >> - } >> - } >> + /* >> + * As we may report that the fence is signaled before all >> + * callbacks are complete, we need to take an additional >> + * reference count on the array so that we do not free it too >> + * early. The core fence handling will only hold the reference >> + * until we signal the array as complete (but that is now >> + * insufficient). >> + */ >> + dma_fence_get(&array->base); >> + irq_dma_fence_array_work(&array->work); >> return true; >> } >> static bool dma_fence_array_signaled(struct dma_fence *fence) >> { >> struct dma_fence_array *array = to_dma_fence_array(fence); >> - int num_pending; >> + int num_pending, error = 0; >> unsigned int i; >> /* >> - * We need to read num_pending before checking the enable_signal bit >> - * to avoid racing with the enable_signaling() implementation, which >> - * might decrement the counter, and cause a partial check. >> - * atomic_read_acquire() pairs with atomic_dec_and_test() in >> - * dma_fence_array_enable_signaling() >> - * >> - * The !--num_pending check is here to account for the any_signaled case >> - * if we race with enable_signaling(), that means the !num_pending check >> - * in the is_signalling_enabled branch might be outdated (num_pending ( >> - * might have been decremented), but that's fine. The user will get the >> - * right value when testing again later. >> + * Reading num_pending is just an optimization, it is perfectly >> + * acceptable to have a stale value for it. > > Bear with me please. I decided to look at this in the morning and maybe it is too early after all. At first I thought "is this true". Because for example: > > num_fences = 2 > num_pending = 1 > > fences = [ signaled, unsignaled ] > > Below loop exits and function returns array signaled status. > > Then I realised array->num_pending is not the number of unsignaled fences. Instead it seems to be number of fences on which callbacks have not been installed, regardless of the signaled status. Or from a different angle, the next fence index to install the callback on after the current one signals. > > But still the false positive seems possible. After installing the callback on the 2nd fence num_pending will be 1, so the signaled check at a point where the first fence has been signaled, but the second one still has not will return true. Dma_fence_array_signaled() cannot know since it doesn't look at the second fence. Good point, I will rework the handling to take that into account. Thanks for the review, Christian. > > Regards, > > Tvrtko > >> */ >> - num_pending = atomic_read_acquire(&array->num_pending); >> - if (test_bit(DMA_FENCE_FLAG_ENABLE_SIGNAL_BIT, &array->base.flags)) { >> - if (num_pending <= 0) >> - goto signal; >> - return false; >> - } >> + num_pending = READ_ONCE(array->num_pending); >> + for (i = 0; i < num_pending; ++i) { >> + struct dma_fence *f = array->fences[i]; >> - for (i = 0; i < array->num_fences; ++i) { >> - if (dma_fence_is_signaled(array->fences[i]) && !--num_pending) >> - goto signal; >> - } >> - return false; >> + if (!dma_fence_is_signaled(f)) >> + return false; >> -signal: >> + if (!error) >> + error = f->error; >> + } >> + dma_fence_array_set_pending_error(array, error); >> dma_fence_array_clear_pending_error(array); >> return true; >> } >> @@ -171,15 +145,12 @@ EXPORT_SYMBOL(dma_fence_array_ops); >> /** >> * dma_fence_array_alloc - Allocate a custom fence array >> - * @num_fences: [in] number of fences to add in the array >> * >> * Return dma fence array on success, NULL on failure >> */ >> -struct dma_fence_array *dma_fence_array_alloc(int num_fences) >> +struct dma_fence_array *dma_fence_array_alloc(void) >> { >> - struct dma_fence_array *array; >> - >> - return kzalloc_flex(*array, callbacks, num_fences); >> + return kzalloc_obj(struct dma_fence_array); >> } >> EXPORT_SYMBOL(dma_fence_array_alloc); >> @@ -190,21 +161,22 @@ EXPORT_SYMBOL(dma_fence_array_alloc); >> * @fences: [in] array containing the fences >> * @context: [in] fence context to use >> * @seqno: [in] sequence number to use >> - * @signal_on_any: [in] signal on any fence in the array >> * >> * Implementation of @dma_fence_array_create without allocation. Useful to init >> * a preallocated dma fence array in the path of reclaim or dma fence signaling. >> */ >> void dma_fence_array_init(struct dma_fence_array *array, >> int num_fences, struct dma_fence **fences, >> - u64 context, unsigned seqno, >> - bool signal_on_any) >> + u64 context, unsigned seqno) >> { >> static struct lock_class_key dma_fence_array_lock_key; >> WARN_ON(!num_fences || !fences); >> array->num_fences = num_fences; >> + array->num_pending = num_fences; >> + array->fences = fences; >> + array->base.error = PENDING_ERROR; >> dma_fence_init(&array->base, &dma_fence_array_ops, NULL, context, >> seqno); >> @@ -222,11 +194,6 @@ void dma_fence_array_init(struct dma_fence_array *array, >> */ >> lockdep_set_class(&array->base.inline_lock, &dma_fence_array_lock_key); >> - atomic_set(&array->num_pending, signal_on_any ? 1 : num_fences); >> - array->fences = fences; >> - >> - array->base.error = PENDING_ERROR; >> - >> /* >> * dma_fence_array objects should never contain any other fence >> * containers or otherwise we run into recursion and potential kernel >> @@ -249,7 +216,6 @@ EXPORT_SYMBOL(dma_fence_array_init); >> * @fences: [in] array containing the fences >> * @context: [in] fence context to use >> * @seqno: [in] sequence number to use >> - * @signal_on_any: [in] signal on any fence in the array >> * >> * Allocate a dma_fence_array object and initialize the base fence with >> * dma_fence_init(). >> @@ -264,17 +230,16 @@ EXPORT_SYMBOL(dma_fence_array_init); >> */ >> struct dma_fence_array *dma_fence_array_create(int num_fences, >> struct dma_fence **fences, >> - u64 context, unsigned seqno, >> - bool signal_on_any) >> + u64 context, unsigned seqno) >> { >> struct dma_fence_array *array; >> - array = dma_fence_array_alloc(num_fences); >> + array = dma_fence_array_alloc(); >> if (!array) >> return NULL; >> dma_fence_array_init(array, num_fences, fences, >> - context, seqno, signal_on_any); >> + context, seqno); >> return array; >> } >> diff --git a/drivers/dma-buf/dma-fence-unwrap.c b/drivers/dma-buf/dma-fence-unwrap.c >> index 07fe9bf45aea..53bb40e70b27 100644 >> --- a/drivers/dma-buf/dma-fence-unwrap.c >> +++ b/drivers/dma-buf/dma-fence-unwrap.c >> @@ -180,8 +180,7 @@ struct dma_fence *__dma_fence_unwrap_merge(unsigned int num_fences, >> if (count > 1) { >> result = dma_fence_array_create(count, array, >> - dma_fence_context_alloc(1), >> - 1, false); >> + dma_fence_context_alloc(1), 1); >> if (!result) { >> for (i = 0; i < count; i++) >> dma_fence_put(array[i]); >> diff --git a/drivers/dma-buf/dma-resv.c b/drivers/dma-buf/dma-resv.c >> index ce9e6c04897f..39a92d9f2413 100644 >> --- a/drivers/dma-buf/dma-resv.c >> +++ b/drivers/dma-buf/dma-resv.c >> @@ -648,8 +648,7 @@ int dma_resv_get_singleton(struct dma_resv *obj, enum dma_resv_usage usage, >> } >> array = dma_fence_array_create(count, fences, >> - dma_fence_context_alloc(1), >> - 1, false); >> + dma_fence_context_alloc(1), 1); >> if (!array) { >> while (count--) >> dma_fence_put(fences[count]); >> diff --git a/drivers/dma-buf/st-dma-fence-unwrap.c b/drivers/dma-buf/st-dma-fence-unwrap.c >> index 9c74195f47fd..45413666970e 100644 >> --- a/drivers/dma-buf/st-dma-fence-unwrap.c >> +++ b/drivers/dma-buf/st-dma-fence-unwrap.c >> @@ -65,7 +65,7 @@ static struct dma_fence *mock_array(unsigned int num_fences, ...) >> array = dma_fence_array_create(num_fences, fences, >> dma_fence_context_alloc(1), >> - 1, false); >> + 1); >> if (!array) >> goto error_free; >> return &array->base; >> diff --git a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c >> index e7918f896a26..1ac91a46d87f 100644 >> --- a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c >> +++ b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c >> @@ -3203,8 +3203,7 @@ eb_composite_fence_create(struct i915_execbuffer *eb, int out_fence_fd) >> fence_array = dma_fence_array_create(eb->num_batches, >> fences, >> eb->context->parallel.fence_context, >> - eb->context->parallel.seqno++, >> - false); >> + eb->context->parallel.seqno++); >> if (!fence_array) { >> kfree(fences); >> return ERR_PTR(-ENOMEM); >> diff --git a/drivers/gpu/drm/xe/xe_sync.c b/drivers/gpu/drm/xe/xe_sync.c >> index 24d6d9af20d6..37866768d64c 100644 >> --- a/drivers/gpu/drm/xe/xe_sync.c >> +++ b/drivers/gpu/drm/xe/xe_sync.c >> @@ -376,7 +376,7 @@ xe_sync_in_fence_get(struct xe_sync_entry *sync, int num_sync, >> xe_assert(vm->xe, current_fence == num_fence); >> cf = dma_fence_array_create(num_fence, fences, >> dma_fence_context_alloc(1), >> - 1, false); >> + 1); >> if (!cf) >> goto err_out; >> diff --git a/drivers/gpu/drm/xe/xe_vm.c b/drivers/gpu/drm/xe/xe_vm.c >> index 548b0769b3ef..b916a9d90104 100644 >> --- a/drivers/gpu/drm/xe/xe_vm.c >> +++ b/drivers/gpu/drm/xe/xe_vm.c >> @@ -3196,7 +3196,7 @@ static struct dma_fence *ops_execute(struct xe_vm *vm, >> goto err_trace; >> } >> - cf = dma_fence_array_alloc(n_fence); >> + cf = dma_fence_array_alloc(); >> if (!cf) { >> fence = ERR_PTR(-ENOMEM); >> goto err_out; >> @@ -3240,7 +3240,7 @@ static struct dma_fence *ops_execute(struct xe_vm *vm, >> xe_assert(vm->xe, current_fence == n_fence); >> dma_fence_array_init(cf, n_fence, fences, dma_fence_context_alloc(1), >> - 1, false); >> + 1); >> fence = &cf->base; >> for_each_tile(tile, vm->xe, id) { >> diff --git a/include/linux/dma-fence-array.h b/include/linux/dma-fence-array.h >> index 370b3d2bba37..3ee55c0e2fa4 100644 >> --- a/include/linux/dma-fence-array.h >> +++ b/include/linux/dma-fence-array.h >> @@ -15,16 +15,6 @@ >> #include <linux/dma-fence.h> >> #include <linux/irq_work.h> >> -/** >> - * struct dma_fence_array_cb - callback helper for fence array >> - * @cb: fence callback structure for signaling >> - * @array: reference to the parent fence array object >> - */ >> -struct dma_fence_array_cb { >> - struct dma_fence_cb cb; >> - struct dma_fence_array *array; >> -}; >> - >> /** >> * struct dma_fence_array - fence to represent an array of fences >> * @base: fence base class >> @@ -33,18 +23,17 @@ struct dma_fence_array_cb { >> * @num_pending: fences in the array still pending >> * @fences: array of the fences >> * @work: internal irq_work function >> - * @callbacks: array of callback helpers >> + * @callback: callback structure for signaling >> */ >> struct dma_fence_array { >> struct dma_fence base; >> - unsigned num_fences; >> - atomic_t num_pending; >> + unsigned int num_fences; >> + unsigned int num_pending; >> struct dma_fence **fences; >> struct irq_work work; >> - >> - struct dma_fence_array_cb callbacks[] __counted_by(num_fences); >> + struct dma_fence_cb callback; >> }; >> /** >> @@ -78,16 +67,13 @@ to_dma_fence_array(struct dma_fence *fence) >> for (index = 0, fence = dma_fence_array_first(head); fence; \ >> ++(index), fence = dma_fence_array_next(head, index)) >> -struct dma_fence_array *dma_fence_array_alloc(int num_fences); >> +struct dma_fence_array *dma_fence_array_alloc(void); >> void dma_fence_array_init(struct dma_fence_array *array, >> int num_fences, struct dma_fence **fences, >> - u64 context, unsigned seqno, >> - bool signal_on_any); >> - >> + u64 context, unsigned seqno); >> struct dma_fence_array *dma_fence_array_create(int num_fences, >> struct dma_fence **fences, >> - u64 context, unsigned seqno, >> - bool signal_on_any); >> + u64 context, unsigned seqno); >> bool dma_fence_match_context(struct dma_fence *fence, u64 context); >> >

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