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| /freebsd-11-stable/sys/arm/arm/ | ||
| H A D | busdma_machdep-v6.c | diff 269211 Tue Jul 29 00:50:14 MDT 2014 ian The run_filter() function doesn't just run dma tag exclusion filter functions, it has evolved to make a variety of decisions about whether the DMA needs to bounce, so rename it to must_bounce(). Rewrite it to perform checks outside of the ancestor loop if they're based on information that's wholly contained within the original tag. Now the loop only checks exclusion zones in ancestor tags. Also, add a new function, might_bounce() which does a fast inline check of flags within the tag and map to quickly eliminate the need to call the more expensive must_bounce() for each page in the DMA operation. Within the mapping loops, use map->pagesneeded != 0 as a proxy for all the various checks on whether bouncing might be required. If no pages were reserved for bouncing during the checks before the mapping loop, then there's no need to re-check any of the conditions that can lead to bouncing -- all those checks already decided there would be no bouncing. Reviewed by: cognet |
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