Rafael Antognolli
dfc9ab2ccd
It's possible that we still have some space left in the block pool, but we try to allocate a state larger than that state. This means such state would start somewhere within the range of the old block_pool, and end after that range, within the range of the new size. That's fine when we use userptr, since the memory in the block pool is CPU mapped continuously. However, by the end of this series, we will have the block_pool split into different BOs, with different CPU mapping ranges that are not necessarily continuous. So we must avoid such case of a given state being part of two different BOs in the block pool. This commit solves the issue by detecting that we are growing the block_pool even though we are not at the end of the range. If that happens, we don't use the space left at the end of the old size, and consider it as "padding" that can't be used in the allocation. We update the size requested from the block pool to take the padding into account, and return the offset after the padding, which happens to be at the start of the new address range. Additionally, we return the amount of padding we used, so the caller knows that this happens and can return that padding back into a list of free states, that can be reused later. This way we hopefully don't waste any space, but also avoid having a state split between two different BOs. v3: - Calculate offset + padding at anv_block_pool_alloc_new (Jason). v4: - Remove extra "leftover". Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
`Mesa <https://mesa3d.org>`_ - The 3D Graphics Library
======================================================
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