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Implement GGTT update method with blitter command, MI_UPDATE_GTT and install those handlers if a platform requires that. v2: Make sure we hold the GT wakeref and Blitter engine wakeref before we call mutex_lock/intel_context_enter below. When GT/engine are not awake, the intel_context_enter calls into some runtime pm function which can end up with kmalloc/fs_reclaim. But trigger fs_reclaim holding a mutex lock is not allowed because shrinker can also try to hold the same mutex lock. It is a circular lock. So hold the GT/blitter engine wakeref before calling mutex_lock, to fix the circular lock. Signed-off-by: Nirmoy Das <nirmoy.das@intel.com> Signed-off-by: Oak Zeng <oak.zeng@intel.com> Acked-by: Oak Zeng <oak.zeng@intel.com> Reviewed-by: Andi Shyti <andi.shyti@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20230926083742.14740-6-nirmoy.das@intel.com
Linux kernel
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