Inject userptr invalidation -EINVAL errors

configname: CONFIG_DRM_XE_USERPTR_INVAL_INJECT

Linux Kernel Configuration
└─>Device Drivers
└─>Graphics support
└─>drm/Xe Debugging
└─>Inject userptr invalidation -EINVAL errors
In linux kernel since version 4.19.310 (release Date: 2024-03-15)  
Choose this option when debugging error paths that
are hit during checks for userptr invalidations.

Recomended for driver developers only.
If in doubt, say "N".

depends
CONFIG_DRM_XE
CONFIG_EXPERT
CONFIG_HAS_IOMEM