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| author | Jason Gunthorpe <jgg@nvidia.com> | 2023-10-03 18:52:36 +0200 |
|---|---|---|
| committer | Joerg Roedel <jroedel@suse.de> | 2023-10-05 12:58:56 +0200 |
| commit | 0f6a90436a5771fc9f6ca0d1e64f7549219e6c3c (patch) | |
| tree | 817d4de9650217a5c0a2a9792fa728b199eb2d04 /drivers/iommu/iommu.c | |
| parent | iommu: Remove duplicate include (diff) | |
| download | linux-0f6a90436a5771fc9f6ca0d1e64f7549219e6c3c.tar.xz linux-0f6a90436a5771fc9f6ca0d1e64f7549219e6c3c.zip | |
iommu: Do not use IOMMU_DOMAIN_DMA if CONFIG_IOMMU_DMA is not enabled
msm_iommu platforms do not select either CONFIG_IOMMU_DMA or
CONFIG_ARM_DMA_USE_IOMMU so they create a IOMMU_DOMAIN_DMA domain by
default and never populate it. This acts like a BLOCKED domain and breaks
the GPU driver on the platform.
Detect this and force use of IDENTITY instead.
Fixes: 98ac73f99bc4 ("iommu: Require a default_domain for all iommu drivers")
Reported-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Link: https://lore.kernel.org/linux-iommu/CAA8EJprz7VVmBG68U9zLuqPd0UdSRHYoLDJSP6tCj6H6qanuTQ@mail.gmail.com/
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Jerry Snitselaar <jsnitsel@redhat.com>
Tested-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Link: https://lore.kernel.org/r/0-v1-20700abdf239+19c-iommu_no_dma_iommu_jgg@nvidia.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'drivers/iommu/iommu.c')
| -rw-r--r-- | drivers/iommu/iommu.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c index 1ecac2b5c54f..21d45e6a5931 100644 --- a/drivers/iommu/iommu.c +++ b/drivers/iommu/iommu.c @@ -1920,6 +1920,18 @@ static int iommu_get_default_domain_type(struct iommu_group *group, } } + /* + * If the common dma ops are not selected in kconfig then we cannot use + * IOMMU_DOMAIN_DMA at all. Force IDENTITY if nothing else has been + * selected. + */ + if (!IS_ENABLED(CONFIG_IOMMU_DMA)) { + if (WARN_ON(driver_type == IOMMU_DOMAIN_DMA)) + return -1; + if (!driver_type) + driver_type = IOMMU_DOMAIN_IDENTITY; + } + if (untrusted) { if (driver_type && driver_type != IOMMU_DOMAIN_DMA) { dev_err_ratelimited( |