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linux/drivers/iommu/amd
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Mario Limonciello 121660bba6 iommu/amd: Enable swiotlb in all cases 
Previously the AMD IOMMU would only enable SWIOTLB in certain
circumstances:
 * IOMMU in passthrough mode
 * SME enabled

This logic however doesn't work when an untrusted device is plugged in
that doesn't do page aligned DMA transactions.  The expectation is
that a bounce buffer is used for those transactions.

This fails like this:

swiotlb buffer is full (sz: 4096 bytes), total 0 (slots), used 0 (slots)

That happens because the bounce buffers have been allocated, followed by
freed during startup but the bounce buffering code expects that all IOMMUs
have left it enabled.

Remove the criteria to set up bounce buffers on AMD systems to ensure
they're always available for supporting untrusted devices.

Fixes: 82612d66d5 ("iommu: Allow the dma-iommu api to use bounce buffers")
Suggested-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20220404204723.9767-2-mario.limonciello@amd.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
2022-04-28 10:26:49 +02:00
..
amd_iommu_types.h iommu/amd: Recover from event log overflow 2022-02-14 12:06:55 +01:00
amd_iommu.h Merge branches 'arm/mediatek', 'arm/msm', 'arm/renesas', 'arm/rockchip', 'arm/smmu', 'x86/vt-d' and 'x86/amd' into next 2022-03-08 12:21:31 +01:00
debugfs.c
init.c Merge branches 'arm/mediatek', 'arm/msm', 'arm/renesas', 'arm/rockchip', 'arm/smmu', 'x86/vt-d' and 'x86/amd' into next 2022-03-08 12:21:31 +01:00
io_pgtable.c iommu/amd: Fix I/O page table memory leak 2022-02-14 12:52:40 +01:00
iommu_v2.c Merge branches 'arm/mediatek', 'arm/msm', 'arm/renesas', 'arm/rockchip', 'arm/smmu', 'x86/vt-d' and 'x86/amd' into next 2022-03-08 12:21:31 +01:00
iommu.c iommu/amd: Enable swiotlb in all cases 2022-04-28 10:26:49 +02:00
Kconfig iommu/amd: Prepare for generic IO page table framework 2021-01-28 16:51:17 +01:00
Makefile iommu/amd: Prepare for generic IO page table framework 2021-01-28 16:51:17 +01:00
quirks.c