From: Sam Protsenko Date: Thu, 14 Jul 2022 16:55:47 +0000 (+0300) Subject: iommu/exynos: Set correct dma mask for SysMMU v5+ X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=5f26ad58be8c0ca4dc8b13788a35e71b42cb3b4e;p=linux.git iommu/exynos: Set correct dma mask for SysMMU v5+ 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 Co-developed-by: Marek Szyprowski Signed-off-by: Marek Szyprowski Acked-by: Krzysztof Kozlowski Link: https://lore.kernel.org/r/20220714165550.8884-4-semen.protsenko@linaro.org Signed-off-by: Joerg Roedel --- diff --git a/drivers/iommu/exynos-iommu.c b/drivers/iommu/exynos-iommu.c index 7058f08e8301f..ca3656e18f258 100644 --- a/drivers/iommu/exynos-iommu.c +++ b/drivers/iommu/exynos-iommu.c @@ -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;