Am 11.08.19 um 18:25 schrieb Chris Wilson:
> When one of the array of fences is signaled, propagate its errors to the
> parent fence-array (keeping the first error to be raised).
>
> v2: Opencode cmpxchg_local to avoid compiler freakout.
> v3: Be careful not to flag an error if we race against signal-on-any.
> v4: Same applies to installing the signal cb.
> v5: Use cmpxchg to only set the error once before using a nifty idea by
> Christian to avoid changing the status after emitting the signal.
>
> Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
> Cc: Sumit Semwal <sumit.semwal@xxxxxxxxxx>
> Cc: Gustavo Padovan <gustavo@xxxxxxxxxxx>
> Cc: Christian König <christian.koenig@xxxxxxx>
Reviewed-by: Christian König <christian.koenig@xxxxxxx>
> ---
> drivers/dma-buf/dma-fence-array.c | 32 ++++++++++++++++++++++++++++++-
> 1 file changed, 31 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/dma-buf/dma-fence-array.c b/drivers/dma-buf/dma-fence-array.c
> index 12c6f64c0bc2..d3fbd950be94 100644
> --- a/drivers/dma-buf/dma-fence-array.c
> +++ b/drivers/dma-buf/dma-fence-array.c
> @@ -13,6 +13,8 @@
> #include <linux/slab.h>
> #include <linux/dma-fence-array.h>
>
> +#define PENDING_ERROR 1
> +
> static const char *dma_fence_array_get_driver_name(struct dma_fence *fence)
> {
> return "dma_fence_array";
> @@ -23,10 +25,29 @@ static const char *dma_fence_array_get_timeline_name(struct dma_fence *fence)
> return "unbound";
> }
>
> +static void dma_fence_array_set_pending_error(struct dma_fence_array *array,
> + int error)
> +{
> + /*
> + * Propagate the first error reported by any of our fences, but only
> + * before we ourselves are signaled.
> + */
> + if (error)
> + cmpxchg(&array->base.error, PENDING_ERROR, error);
> +}
> +
> +static void dma_fence_array_clear_pending_error(struct dma_fence_array *array)
> +{
> + /* Clear the error flag if not actually set. */
> + cmpxchg(&array->base.error, PENDING_ERROR, 0);
> +}
> +
> static void irq_dma_fence_array_work(struct irq_work *wrk)
> {
> struct dma_fence_array *array = container_of(wrk, typeof(*array), work);
>
> + dma_fence_array_clear_pending_error(array);
> +
> dma_fence_signal(&array->base);
> dma_fence_put(&array->base);
> }
> @@ -38,6 +59,8 @@ static void dma_fence_array_cb_func(struct dma_fence *f,
> container_of(cb, struct dma_fence_array_cb, cb);
> struct dma_fence_array *array = array_cb->array;
>
> + dma_fence_array_set_pending_error(array, f->error);
> +
> if (atomic_dec_and_test(&array->num_pending))
> irq_work_queue(&array->work);
> else
> @@ -63,9 +86,14 @@ static bool dma_fence_array_enable_signaling(struct dma_fence *fence)
> 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))
> + if (atomic_dec_and_test(&array->num_pending)) {
> + dma_fence_array_clear_pending_error(array);
> return false;
> + }
> }
> }
>
> @@ -142,6 +170,8 @@ struct dma_fence_array *dma_fence_array_create(int num_fences,
> atomic_set(&array->num_pending, signal_on_any ? 1 : num_fences);
> array->fences = fences;
>
> + array->base.error = PENDING_ERROR;
> +
> return array;
> }
> EXPORT_SYMBOL(dma_fence_array_create);
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