On 23.04.2018 11:34, Dmitry Osipenko wrote: > On 23.04.2018 09:57, Thierry Reding wrote: >> From: Thierry Reding <treding@xxxxxxxxxx> >> >> The IOVA API uses a memory cache to allocate IOVA nodes from. To make >> sure that this cache is available, obtain a reference to it and release >> the reference when the cache is no longer needed. >> >> On 64-bit ARM this is hidden by the fact that the DMA mapping API gets >> that reference and never releases it. On 32-bit ARM, however, the DMA >> mapping API doesn't do that, so allocation of IOVA nodes fails. >> >> Signed-off-by: Thierry Reding <treding@xxxxxxxxxx> >> --- > > Reviewed-by: Dmitry Osipenko <digetx@xxxxxxxxx> > Tested-by: Dmitry Osipenko <digetx@xxxxxxxxx> > > CONFIG_TEGRA_IOMMU_SMMU is enabled in the default kernel configs and hence DRM > should fail to probe on t124 since 4.11. What about to add stable tag for v4.11+ > here to unbreak stable kernels as well? IOMMU node for host1x was added to t124 DT in kernel v4.14, so s/4.11/4.14/. -- To unsubscribe from this list: send the line "unsubscribe linux-tegra" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
