Sadly, we can't have this patch as long as we support SUBMIT_FENCE.
Turns out this is used for something real. :-(
--Jason
On Fri, Apr 23, 2021 at 5:31 PM Jason Ekstrand <jason@xxxxxxxxxxxxxx> wrote:
>
> This was only ever used for bonded virtual engine execution. Since
> that's no longer allowed, this is dead code.
>
> Signed-off-by: Jason Ekstrand <jason@xxxxxxxxxxxxxx>
> ---
> .../gpu/drm/i915/gem/i915_gem_execbuffer.c | 3 +-
> drivers/gpu/drm/i915/i915_request.c | 42 ++++---------------
> drivers/gpu/drm/i915/i915_request.h | 4 +-
> 3 files changed, 9 insertions(+), 40 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
> index efb2fa3522a42..7024adcd5cf15 100644
> --- a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
> +++ b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
> @@ -3473,8 +3473,7 @@ i915_gem_do_execbuffer(struct drm_device *dev,
> if (in_fence) {
> if (args->flags & I915_EXEC_FENCE_SUBMIT)
> err = i915_request_await_execution(eb.request,
> - in_fence,
> - NULL);
> + in_fence);
> else
> err = i915_request_await_dma_fence(eb.request,
> in_fence);
> diff --git a/drivers/gpu/drm/i915/i915_request.c b/drivers/gpu/drm/i915/i915_request.c
> index bec9c3652188b..7e00218b8c105 100644
> --- a/drivers/gpu/drm/i915/i915_request.c
> +++ b/drivers/gpu/drm/i915/i915_request.c
> @@ -49,7 +49,6 @@
> struct execute_cb {
> struct irq_work work;
> struct i915_sw_fence *fence;
> - void (*hook)(struct i915_request *rq, struct dma_fence *signal);
> struct i915_request *signal;
> };
>
> @@ -180,17 +179,6 @@ static void irq_execute_cb(struct irq_work *wrk)
> kmem_cache_free(global.slab_execute_cbs, cb);
> }
>
> -static void irq_execute_cb_hook(struct irq_work *wrk)
> -{
> - struct execute_cb *cb = container_of(wrk, typeof(*cb), work);
> -
> - cb->hook(container_of(cb->fence, struct i915_request, submit),
> - &cb->signal->fence);
> - i915_request_put(cb->signal);
> -
> - irq_execute_cb(wrk);
> -}
> -
> static __always_inline void
> __notify_execute_cb(struct i915_request *rq, bool (*fn)(struct irq_work *wrk))
> {
> @@ -517,17 +505,12 @@ static bool __request_in_flight(const struct i915_request *signal)
> static int
> __await_execution(struct i915_request *rq,
> struct i915_request *signal,
> - void (*hook)(struct i915_request *rq,
> - struct dma_fence *signal),
> gfp_t gfp)
> {
> struct execute_cb *cb;
>
> - if (i915_request_is_active(signal)) {
> - if (hook)
> - hook(rq, &signal->fence);
> + if (i915_request_is_active(signal))
> return 0;
> - }
>
> cb = kmem_cache_alloc(global.slab_execute_cbs, gfp);
> if (!cb)
> @@ -537,12 +520,6 @@ __await_execution(struct i915_request *rq,
> i915_sw_fence_await(cb->fence);
> init_irq_work(&cb->work, irq_execute_cb);
>
> - if (hook) {
> - cb->hook = hook;
> - cb->signal = i915_request_get(signal);
> - cb->work.func = irq_execute_cb_hook;
> - }
> -
> /*
> * Register the callback first, then see if the signaler is already
> * active. This ensures that if we race with the
> @@ -1253,7 +1230,7 @@ emit_semaphore_wait(struct i915_request *to,
> goto await_fence;
>
> /* Only submit our spinner after the signaler is running! */
> - if (__await_execution(to, from, NULL, gfp))
> + if (__await_execution(to, from, gfp))
> goto await_fence;
>
> if (__emit_semaphore_wait(to, from, from->fence.seqno))
> @@ -1284,16 +1261,14 @@ static int intel_timeline_sync_set_start(struct intel_timeline *tl,
>
> static int
> __i915_request_await_execution(struct i915_request *to,
> - struct i915_request *from,
> - void (*hook)(struct i915_request *rq,
> - struct dma_fence *signal))
> + struct i915_request *from)
> {
> int err;
>
> GEM_BUG_ON(intel_context_is_barrier(from->context));
>
> /* Submit both requests at the same time */
> - err = __await_execution(to, from, hook, I915_FENCE_GFP);
> + err = __await_execution(to, from, I915_FENCE_GFP);
> if (err)
> return err;
>
> @@ -1406,9 +1381,7 @@ i915_request_await_external(struct i915_request *rq, struct dma_fence *fence)
>
> int
> i915_request_await_execution(struct i915_request *rq,
> - struct dma_fence *fence,
> - void (*hook)(struct i915_request *rq,
> - struct dma_fence *signal))
> + struct dma_fence *fence)
> {
> struct dma_fence **child = &fence;
> unsigned int nchild = 1;
> @@ -1441,8 +1414,7 @@ i915_request_await_execution(struct i915_request *rq,
>
> if (dma_fence_is_i915(fence))
> ret = __i915_request_await_execution(rq,
> - to_request(fence),
> - hook);
> + to_request(fence));
> else
> ret = i915_request_await_external(rq, fence);
> if (ret < 0)
> @@ -1468,7 +1440,7 @@ await_request_submit(struct i915_request *to, struct i915_request *from)
> &from->submit,
> I915_FENCE_GFP);
> else
> - return __i915_request_await_execution(to, from, NULL);
> + return __i915_request_await_execution(to, from);
> }
>
> static int
> diff --git a/drivers/gpu/drm/i915/i915_request.h b/drivers/gpu/drm/i915/i915_request.h
> index 270f6cd37650c..63b087a7f5707 100644
> --- a/drivers/gpu/drm/i915/i915_request.h
> +++ b/drivers/gpu/drm/i915/i915_request.h
> @@ -352,9 +352,7 @@ int i915_request_await_object(struct i915_request *to,
> int i915_request_await_dma_fence(struct i915_request *rq,
> struct dma_fence *fence);
> int i915_request_await_execution(struct i915_request *rq,
> - struct dma_fence *fence,
> - void (*hook)(struct i915_request *rq,
> - struct dma_fence *signal));
> + struct dma_fence *fence);
>
> void i915_request_add(struct i915_request *rq);
>
> --
> 2.31.1
>
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