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If the Tegra DRM clients are backed by an IOMMU, push buffers are likely to be allocated beyond the 32-bit boundary if sufficient system memory is available. This is problematic on earlier generations of Tegra where host1x supports a maximum of 32 address bits for the GATHER opcode. More recent versions of Tegra (Tegra186 and later) have a wide variant of the GATHER opcode, which allows addressing up to 64 bits of memory. If host1x itself is behind an IOMMU as well this doesn't matter because the IOMMU's input address space is restricted to 32 bits on generations without support for wide GATHER opcodes. However, if host1x is not behind an IOMMU, it won't be able to process push buffers beyond the 32-bit boundary on Tegra generations that don't support wide GATHER opcodes. Restrict the DMA mask to 32 bits on these generations prevents buffers from being allocated from beyond the 32-bit boundary. 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 | ||