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IOVAs are aligned to the smallest PAGE_SIZE order, where the requested IOVA can fit. But this might not work for all use-cases. It can cause IOVA fragmentation in some multimedia and 8K video use-cases that may require larger buffers to be allocated and mapped. When the above allocation pattern is used with the current alignment scheme, the IOVA space could be quickly exhausted for 32bit devices. In order to get better IOVA space utilization and reduce fragmentation, a new kernel command line parameter is introduced to make the alignment limit configurable by the user during boot. Bug: 190519428 Change-Id: I0c8e72370fc3266a5a242837d82aae4f9831aef3 Link: https://lore.kernel.org/r/1634148667-409263-1-git-send-email-quic_c_gdjako@quicinc.com/ Signed-off-by: Georgi Djakov <quic_c_gdjako@quicinc.com>
