Messages in this thread Patch in this message |  | | From | Sam Protsenko <> | Subject | [PATCH 1/4] iommu/exynos: Set correct dma mask for SysMMU v5+ | Date | Sun, 3 Jul 2022 00:37:21 +0300 |
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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.
Originally-by: Marek Szyprowski <m.szyprowski@samsung.com> Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org> --- drivers/iommu/exynos-iommu.c | 8 ++++++++ 1 file changed, 8 insertions(+)
diff --git a/drivers/iommu/exynos-iommu.c b/drivers/iommu/exynos-iommu.c index 71f2018e23fe..28f8c8d93aa3 100644 --- a/drivers/iommu/exynos-iommu.c +++ b/drivers/iommu/exynos-iommu.c @@ -647,6 +647,14 @@ 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); + return ret; + } + } + /* * use the first registered sysmmu device for performing * dma mapping operations on iommu page tables (cpu cache flush) -- 2.30.2
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