Quoting Chris Wilson (2018-07-12 19:53:15)
> @@ -789,10 +789,12 @@ i915_gem_userptr_ioctl(struct drm_device *dev,
> return -EFAULT;
>
> if (args->flags & I915_USERPTR_READ_ONLY) {
> - /* On almost all of the current hw, we cannot tell the GPU that a
> - * page is readonly, so this is just a placeholder in the uAPI.
> + /*
> + * On almost all of the older hw, we cannot tell the GPU that
> + * a page is readonly.
> */
> - return -ENODEV;
> + if (INTEL_GEN(dev_priv) < 8 || !USES_PPGTT(dev_priv))
> + return -ENODEV;
Hmm, I need to be more careful here considering gvt.
-Chris
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