On 05/08/2020 13:22, Chris Wilson wrote:
Currently, if an error is raised we always call the cleanup locally
[and skip the main work callback]. However, some future users may need
to take a mutex to cleanup and so we cannot immediately execute the
cleanup as we may still be in interrupt context. For example, if we have
committed sensitive changes [like evicting from the ppGTT layout] that
are visible but gated behind the fence, we need to ensure those changes
are completed even after an error. [This does suggest the split between
the work/release callback is artificial and we may be able to simplify
the worker api by only requiring a single callback.]
With the execute-immediate flag, for most cases this should result in
immediate cleanup of an error.
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/i915_sw_fence_work.c | 26 +++++++++++------------
1 file changed, 13 insertions(+), 13 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_sw_fence_work.c b/drivers/gpu/drm/i915/i915_sw_fence_work.c
index a3a81bb8f2c3..e094fd0a4202 100644
--- a/drivers/gpu/drm/i915/i915_sw_fence_work.c
+++ b/drivers/gpu/drm/i915/i915_sw_fence_work.c
@@ -16,11 +16,14 @@ static void fence_complete(struct dma_fence_work *f)
static void fence_work(struct work_struct *work)
{
struct dma_fence_work *f = container_of(work, typeof(*f), work);
- int err;
- err = f->ops->work(f);
- if (err)
- dma_fence_set_error(&f->dma, err);
+ if (!f->dma.error) {
+ int err;
+
+ err = f->ops->work(f);
+ if (err)
+ dma_fence_set_error(&f->dma, err);
+ }
fence_complete(f);
dma_fence_put(&f->dma);
@@ -36,15 +39,10 @@ fence_notify(struct i915_sw_fence *fence, enum i915_sw_fence_notify state)
if (fence->error)
dma_fence_set_error(&f->dma, fence->error);
- if (!f->dma.error) {
- dma_fence_get(&f->dma);
- if (test_bit(DMA_FENCE_WORK_IMM, &f->dma.flags))
- fence_work(&f->work);
- else
- queue_work(system_unbound_wq, &f->work);
- } else {
- fence_complete(f);
- }
+ if (test_bit(DMA_FENCE_WORK_IMM, &f->dma.flags))
+ fence_work(&f->work);
+ else
+ queue_work(system_unbound_wq, &f->work);
break;
case FENCE_FREE:
@@ -91,6 +89,8 @@ void dma_fence_work_init(struct dma_fence_work *f,
dma_fence_init(&f->dma, &fence_ops, &f->lock, 0, 0);
i915_sw_fence_init(&f->chain, fence_notify);
INIT_WORK(&f->work, fence_work);
+
+ dma_fence_get(&f->dma); /* once for the chain; once for the work */
}
int dma_fence_work_chain(struct dma_fence_work *f, struct dma_fence *signal)
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
Regards,
Tvrtko
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