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drm/i915/dpt: Make DPT object unshrinkable

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In some scenarios, the DPT object gets shrunk but
the actual framebuffer did not and thus its still
there on the DPT's vm->bound_list. Then it tries to
rewrite the PTEs via a stale CPU mapping. This causes panic.

Cc: stable@vger.kernel.org
Reported-by: Shawn Lee <shawn.c.lee@intel.com>
Fixes: 0dc987b699 ("drm/i915/display: Add smem fallback allocation for dpt")
Signed-off-by: Vidya Srinivas <vidya.srinivas@intel.com>
[vsyrjala: Add TODO comment]
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240520165634.1162470-1-vidya.srinivas@intel.com
This commit is contained in:
Vidya Srinivas 2024-05-20 22:26:34 +05:30 committed by Ville Syrjälä
parent 2689390b4e
commit 51064d471c
1 changed files with 3 additions and 1 deletions
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4
drivers/gpu/drm/i915/gem/i915_gem_object.h
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@ -284,7 +284,9 @@ bool i915_gem_object_has_iomem(const struct drm_i915_gem_object *obj);
static inline bool
i915_gem_object_is_shrinkable(const struct drm_i915_gem_object *obj)
{
return i915_gem_object_type_has(obj, I915_GEM_OBJECT_IS_SHRINKABLE);
/* TODO: make DPT shrinkable when it has no bound vmas */
return i915_gem_object_type_has(obj, I915_GEM_OBJECT_IS_SHRINKABLE) &&
!obj->is_dpt;
}
static inline bool