gpu: host1x: Restrict IOVA space to DMA mask (38fabcc9) · Commits · 戴 / test

On Tegra186 and later, the ARM SMMU provides an input address space that is 48 bits wide. However, memory clients can only address up to 40 bits. If the geometry is used as-is, allocations of IOVA space can end up in a region that is not addressable by the memory clients. To fix this, restrict the IOVA space to the DMA mask of the host1x device. Signed-off-by:

Thierry Reding <treding@nvidia.com>

drivers/gpu/host1x/dev.c

+6 −3

Original line number	Diff line number	Diff line
		@@ -283,6 +283,8 @@ static int host1x_probe(struct platform_device *pdev)
		host->group = iommu_group_get(&pdev->dev);
		if (host->group) {
		struct iommu_domain_geometry *geometry;
		u64 mask = dma_get_mask(host->dev);
		dma_addr_t start, end;
		unsigned long order;

		err = iova_cache_get();
		@@ -310,11 +312,12 @@ static int host1x_probe(struct platform_device *pdev)
		}

		geometry = &host->domain->geometry;
		start = geometry->aperture_start & mask;
		end = geometry->aperture_end & mask;

		order = __ffs(host->domain->pgsize_bitmap);
		init_iova_domain(&host->iova, 1UL << order,
		geometry->aperture_start >> order);
		host->iova_end = geometry->aperture_end;
		init_iova_domain(&host->iova, 1UL << order, start >> order);
		host->iova_end = end;
		}

		skip_iommu:

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