Hi,

This series addresses the weirdness in radeon drivers that every buffer has 2 
handles:
- pb_buffer (== pb_cache_buffer)
- radeon_winsys_cs_handle (winsys-specific pb_buffer)

The inefficiency of converting pb_cache_buffer into the winsys-specific buffer 
made me introduce radeon_winsys_cs_handle a few years ago, which has been used 
for almost everything (map/unmap/command submission/etc.) and pb_buffer has 
only held the reference keeping the buffer alive.

Now it's time to do this right.

This series moves the pb_cache_manager logic into an independent module 
"pb_cache". Next, all dependencies on pb_manager are removed from both winsyses 
and the new module is used instead. The result is that pb_buffer is equal to 
radeon_winsys_cs_handle, and the latter can be removed.

Please review.

Marek
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