In the next patch, we will want to configure the slave request
depending on which physical engine the master request is executed on.
For this, we introduce a callback from the execute fence to convey this
information.
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/i915_request.c | 84 +++++++++++++++++++++++++++--
drivers/gpu/drm/i915/i915_request.h | 4 ++
2 files changed, 83 insertions(+), 5 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_request.c b/drivers/gpu/drm/i915/i915_request.c
index dc79d57ffb84..ace4fd763cac 100644
--- a/drivers/gpu/drm/i915/i915_request.c
+++ b/drivers/gpu/drm/i915/i915_request.c
@@ -37,6 +37,8 @@ struct execute_cb {
struct list_head link;
struct irq_work work;
struct i915_sw_fence *fence;
+ void (*hook)(struct i915_request *rq, struct dma_fence *signal);
+ struct i915_request *signal;
};
static struct i915_global_request {
@@ -343,6 +345,17 @@ 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 void __notify_execute_cb(struct i915_request *rq)
{
struct execute_cb *cb;
@@ -369,14 +382,19 @@ static void __notify_execute_cb(struct i915_request *rq)
}
static int
-i915_request_await_execution(struct i915_request *rq,
- struct i915_request *signal,
- gfp_t gfp)
+__i915_request_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 (i915_request_is_active(signal)) {
+ if (hook)
+ hook(rq, &signal->fence);
return 0;
+ }
cb = kmem_cache_alloc(global.slab_execute_cbs, gfp);
if (!cb)
@@ -386,8 +404,18 @@ i915_request_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;
+ }
+
spin_lock_irq(&signal->lock);
if (i915_request_is_active(signal)) {
+ if (hook) {
+ hook(rq, &signal->fence);
+ i915_request_put(signal);
+ }
i915_sw_fence_complete(cb->fence);
kmem_cache_free(global.slab_execute_cbs, cb);
} else {
@@ -779,7 +807,7 @@ emit_semaphore_wait(struct i915_request *to,
return err;
/* Only submit our spinner after the signaler is running! */
- err = i915_request_await_execution(to, from, gfp);
+ err = __i915_request_await_execution(to, from, NULL, gfp);
if (err)
return err;
@@ -899,6 +927,52 @@ i915_request_await_dma_fence(struct i915_request *rq, struct dma_fence *fence)
return 0;
}
+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 **child = &fence;
+ unsigned int nchild = 1;
+ int ret;
+
+ if (dma_fence_is_array(fence)) {
+ struct dma_fence_array *array = to_dma_fence_array(fence);
+
+ /* XXX Error for signal-on-any fence arrays */
+
+ child = array->fences;
+ nchild = array->num_fences;
+ GEM_BUG_ON(!nchild);
+ }
+
+ do {
+ fence = *child++;
+ if (test_bit(DMA_FENCE_FLAG_SIGNALED_BIT, &fence->flags))
+ continue;
+
+ /*
+ * We don't squash repeated fence dependencies here as we
+ * want to run our callback in all cases.
+ */
+
+ if (dma_fence_is_i915(fence))
+ ret = __i915_request_await_execution(rq,
+ to_request(fence),
+ hook,
+ I915_FENCE_GFP);
+ else
+ ret = i915_sw_fence_await_dma_fence(&rq->submit, fence,
+ I915_FENCE_TIMEOUT,
+ GFP_KERNEL);
+ if (ret < 0)
+ return ret;
+ } while (--nchild);
+
+ return 0;
+}
+
/**
* i915_request_await_object - set this request to (async) wait upon a bo
* @to: request we are wishing to use
diff --git a/drivers/gpu/drm/i915/i915_request.h b/drivers/gpu/drm/i915/i915_request.h
index 35153fa52c8c..b045948da12d 100644
--- a/drivers/gpu/drm/i915/i915_request.h
+++ b/drivers/gpu/drm/i915/i915_request.h
@@ -254,6 +254,10 @@ int i915_request_await_object(struct i915_request *to,
bool write);
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));
void i915_request_add(struct i915_request *rq);
--
2.20.1
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