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The HOST1X_CHANNEL_DMAEND is an offset relative to the value written to the HOST1X_CHANNEL_DMASTART register, but it is currently treated as an absolute address. This can cause SMMU faults if the CDMA fetches past a pushbuffer's IOMMU mapping. Properly setting the DMAEND prevents the CDMA from fetching beyond that address and avoid such issues. This is currently not observed because a whole (almost) page of essentially scratch space absorbs any excessive prefetching by CDMA. However, changing the number of slots in the push buffer can trigger these SMMU faults. Signed-off-by: Thierry Reding <treding@nvidia.com> |
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| .. | ||
| hw | ||
| bus.c | ||
| bus.h | ||
| cdma.c | ||
| cdma.h | ||
| channel.c | ||
| channel.h | ||
| debug.c | ||
| debug.h | ||
| dev.c | ||
| dev.h | ||
| intr.c | ||
| intr.h | ||
| job.c | ||
| job.h | ||
| Kconfig | ||
| Makefile | ||
| mipi.c | ||
| syncpt.c | ||
| syncpt.h | ||