[Intel-gfx] [PATCH 5/7] drm/i915: Implement GGTT update method with MI_UPDATE_GTT

[Andi Shyti]

Hi Nirmoy,

On Mon, Sep 18, 2023 at 07:02:55PM +0200, Nirmoy Das wrote:
> 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 at intel.com>
> Signed-off-by: Oak Zeng <oak.zeng at intel.com>
> Acked-by: Oak Zeng <oak.zeng at intel.com>

Reviewed-by: Andi Shyti <andi.shyti at linux.intel.com> 

Andi