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drm/i915/gt: Use the kernel_context to measure the breadcrumb size

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We set up a dummy ring in order to measure the size we require for our
breadcrumb emission, so that we don't have to manually count dwords! We
can pass in the kernel_context to use for this so that if required it is
known for the breadcrumb emitter, and we can reuse some details from the
kernel_context to reduce the number of temporaries we have to mock.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200207125827.2787472-1-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2020-02-07 12:58:27 +00:00
parent 71b7cc601e
commit fb5970da1b
1 changed files with 19 additions and 28 deletions
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47
drivers/gpu/drm/i915/gt/intel_engine_cs.c
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@ -631,13 +631,13 @@ static int engine_setup_common(struct intel_engine_cs *engine)
struct measure_breadcrumb {
struct i915_request rq;
struct intel_timeline timeline;
struct intel_ring ring;
u32 cs[1024];
};
static int measure_breadcrumb_dw(struct intel_engine_cs *engine)
static int measure_breadcrumb_dw(struct intel_context *ce)
{
struct intel_engine_cs *engine = ce->engine;
struct measure_breadcrumb *frame;
int dw = -ENOMEM;
@ -647,39 +647,27 @@ static int measure_breadcrumb_dw(struct intel_engine_cs *engine)
if (!frame)
return -ENOMEM;
if (intel_timeline_init(&frame->timeline,
engine->gt,
engine->status_page.vma))
goto out_frame;
mutex_lock(&frame->timeline.mutex);
frame->rq.i915 = engine->i915;
frame->rq.engine = engine;
frame->rq.context = ce;
rcu_assign_pointer(frame->rq.timeline, ce->timeline);
frame->ring.vaddr = frame->cs;
frame->ring.size = sizeof(frame->cs);
frame->ring.effective_size = frame->ring.size;
intel_ring_update_space(&frame->ring);
frame->rq.i915 = engine->i915;
frame->rq.engine = engine;
frame->rq.ring = &frame->ring;
rcu_assign_pointer(frame->rq.timeline, &frame->timeline);
dw = intel_timeline_pin(&frame->timeline);
if (dw < 0)
goto out_timeline;
mutex_lock(&ce->timeline->mutex);
spin_lock_irq(&engine->active.lock);
dw = engine->emit_fini_breadcrumb(&frame->rq, frame->cs) - frame->cs;
spin_unlock_irq(&engine->active.lock);
mutex_unlock(&ce->timeline->mutex);
GEM_BUG_ON(dw & 1); /* RING_TAIL must be qword aligned */
intel_timeline_unpin(&frame->timeline);
out_timeline:
mutex_unlock(&frame->timeline.mutex);
intel_timeline_fini(&frame->timeline);
out_frame:
kfree(frame);
return dw;
}
@ -754,12 +742,6 @@ static int engine_init_common(struct intel_engine_cs *engine)
engine->set_default_submission(engine);
ret = measure_breadcrumb_dw(engine);
if (ret < 0)
return ret;
engine->emit_fini_breadcrumb_dw = ret;
/*
* We may need to do things with the shrinker which
* require us to immediately switch back to the default
@ -772,9 +754,18 @@ static int engine_init_common(struct intel_engine_cs *engine)
if (IS_ERR(ce))
return PTR_ERR(ce);
ret = measure_breadcrumb_dw(ce);
if (ret < 0)
goto err_context;
engine->emit_fini_breadcrumb_dw = ret;
engine->kernel_context = ce;
return 0;
err_context:
intel_context_put(ce);
return ret;
}
int intel_engines_init(struct intel_gt *gt)