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drm/i915/frontbuffer: Split fb_tracking.lock into two

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Our fb_tracking.lock is serving a double duty:
- protects fb_tracking.busy_bits
- provides the write-side protection for obj->frontbuffer

Split obj->frontbuffer role into a separate lock so that
we can clean up the current mess with the frontbuffer lifetime
management.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patch.msgid.link/20251016185408.22735-7-ville.syrjala@linux.intel.com
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
This commit is contained in:
Ville Syrjälä
2025-10-16 21:54:04 +03:00
parent 6541748954
commit 3afef438ee
4 changed files with 11 additions and 6 deletions
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2
drivers/gpu/drm/i915/gem/i915_gem_object_frontbuffer.h
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@@ -77,7 +77,7 @@ i915_gem_object_get_frontbuffer(const struct drm_i915_gem_object *obj)
* Set object's frontbuffer pointer. If frontbuffer is already set for the
* object keep it and return it's pointer to the caller. Please note that RCU
* mechanism is used to handle e.g. ongoing removal of frontbuffer pointer. This
* function is protected by i915->display->fb_tracking.lock
* function is protected by i915->display->fb_tracking.frontbuffer_lock
*
* Return: pointer to frontbuffer which was set.
*/