Messages in this thread Patch in this message | | | From | Sven Peter <> | Subject | [PATCH 2/4] iommu: dart: Add flag to override bypass support | Date | Sat, 28 Jan 2023 12:11:12 +0100 |
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The USB4 PCIe DARTs claim to support bypass but we never want to allow that on externally facing ports.
Signed-off-by: Sven Peter <sven@svenpeter.dev> --- drivers/iommu/apple-dart.c | 5 +++++ 1 file changed, 5 insertions(+)
diff --git a/drivers/iommu/apple-dart.c b/drivers/iommu/apple-dart.c index 42666617803d..7d8b2b90cdb6 100644 --- a/drivers/iommu/apple-dart.c +++ b/drivers/iommu/apple-dart.c @@ -182,6 +182,8 @@ struct apple_dart_hw { u64 ttbr_addr_field_shift; u64 ttbr_shift; int ttbr_count; + + bool disable_bypass; }; /* @@ -1075,6 +1077,9 @@ static int apple_dart_probe(struct platform_device *pdev) dart->pgsize = 1 << FIELD_GET(DART_PARAMS1_PAGE_SHIFT, dart_params[0]); dart->supports_bypass = dart_params[1] & DART_PARAMS2_BYPASS_SUPPORT; + if (dart->hw->disable_bypass) + dart->supports_bypass = 0; + switch (dart->hw->type) { case DART_T8020: case DART_T6000: -- 2.25.1
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