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iommu/exynos: Set correct dma mask for SysMMU v5+

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SysMMU v5+ supports 36 bit physical address space. Set corresponding DMA
mask to avoid falling back to SWTLBIO usage in dma_map_single() because
of failed dma_capable() check.

The original code for this fix was suggested by Marek.

Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org>
Co-developed-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20220714165550.8884-4-semen.protsenko@linaro.org
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Sam Protsenko 2022-07-14 19:55:47 +03:00 committed by Joerg Roedel
parent fce398d2d0
commit 5f26ad58be
1 changed files with 10 additions and 0 deletions
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10
drivers/iommu/exynos-iommu.c
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@ -646,6 +646,14 @@ static int exynos_sysmmu_probe(struct platform_device *pdev)
}
}
if (MMU_MAJ_VER(data->version) >= 5) {
ret = dma_set_mask(dev, DMA_BIT_MASK(36));
if (ret) {
dev_err(dev, "Unable to set DMA mask: %d\n", ret);
goto err_dma_set_mask;
}
}
/*
* use the first registered sysmmu device for performing
* dma mapping operations on iommu page tables (cpu cache flush)
@ -657,6 +665,8 @@ static int exynos_sysmmu_probe(struct platform_device *pdev)
return 0;
err_dma_set_mask:
iommu_device_unregister(&data->iommu);
err_iommu_register:
iommu_device_sysfs_remove(&data->iommu);
return ret;