e0b4dfbbda
It is possible to free memory backing images before images are
destroyed :
VkFreeMemory:
"Memory can be freed whilst still bound to resources, but those
resources must not be used afterwards."
The spec leaves us the option to keep a reference on the associated
memory and free it only when all the bound resources have been
destroyed. Here we choose to free memory immediately.
One particular test in the CTS
(dEQP-VK.synchronization.internally_synchronized_objects.pipeline_cache_graphics)
does the following :
imgA = vkCreateImage()
imgB = vkCreateImage()
memA = vkAllocateMemory()
vkBindImageMemory(imgA, memA) # Aux mapping with ref count = 1
vkFreeMemory(memA) # Aux mapping removed, ref count = 0
memB = vkAllocateMemory() # Same address as memA
vkBindImageMemory(imgB, memB)
vkDestroyImage(imgA) # Removes the mapping of imgB-memB
vkQueueSubmit() # hang with pagefault in AUX-TT
The solution implemented in this change is to not do anything AUX-TT
related in vkFreeMemory(). This soluation has some consequences,
because a virtual memory address range freed and reallocated cannot be
rebound in the AUX-TT until all the associated resources have released
their AUX-TT mapping (to bring back the AUX-TT refcount of the range
to 0). This should still be better than keeping the memory allocated
through refcounting of the anv_bo.
Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Fixes: 7b87e1afbc ("anv: track & unbind image aux-tt binding")
Closes: https://gitlab.freedesktop.org/mesa/mesa/-/issues/10528
Reviewed-by: Tapani Pälli <tapani.palli@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/27566>
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