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Pierre-Eric Pelloux-Prayer
ddf055b80a
Until now ttm stored a single pipelined eviction fence which means drivers had to use a single entity for these evictions. To lift this requirement, this commit allows up to 8 entities to be used. Ideally a dma_resv object would have been used as a container of the eviction fences, but the locking rules makes it complex. dma_resv all have the same ww_class, which means "Attempting to lock more mutexes after ww_acquire_done." is an error. One alternative considered was to introduced a 2nd ww_class for specific resv to hold a single "transient" lock (= the resv lock would only be held for a short period, without taking any other locks). The other option, is to statically reserve a fence array, and extend the existing code to deal with N fences, instead of 1. The driver is still responsible to reserve the correct number of fence slots. Signed-off-by: Pierre-Eric Pelloux-Prayer <[email protected]> Link: https://lore.kernel.org/r/[email protected] Reviewed-by: Christian König <[email protected]> Signed-off-by: Christian König <[email protected]>