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drm/i915: Wait on vma activity before taking the mutex

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Optimistically wait for the prior vma activity before taking the mutex
to minimise the mutex hold time while unbinding. We will then verify the
vma is idle with a second wait under the mutex to ensure it is safe to
unbind.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200123224459.38128-2-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson
2020-01-23 22:44:59 +00:00
parent 60e94557ff
commit d62f416f92
1 changed files with 7 additions and 2 deletions
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9
drivers/gpu/drm/i915/i915_vma.c
View File

@@ -1279,16 +1279,21 @@ int i915_vma_unbind(struct i915_vma *vma)
/* XXX not always required: nop_clear_range */
wakeref = intel_runtime_pm_get(&vm->i915->runtime_pm);
/* Optimistic wait before taking the mutex */
err = i915_vma_sync(vma);
if (err)
goto out_rpm;
err = mutex_lock_interruptible(&vm->mutex);
if (err)
return err;
goto out_rpm;
err = __i915_vma_unbind(vma);
mutex_unlock(&vm->mutex);
out_rpm:
if (wakeref)
intel_runtime_pm_put(&vm->i915->runtime_pm, wakeref);
return err;
}