diff options
| author | Michał Żygowski <michal.zygowski@3mdeb.com> | 2022-10-15 16:35:31 +0200 |
|---|---|---|
| committer | Paul Fagerburg <pfagerburg@chromium.org> | 2023-03-17 13:53:53 +0000 |
| commit | e6225874eba0e6c894b3408bcfc98292f0fe60d1 (patch) | |
| tree | 2052aa4e1db6047d76a6b4e47f908086ec0b50a1 /src/soc/intel/common/block/include | |
| parent | 9a035ede17a23127ec4fc451ab84283e79636e75 (diff) | |
intelblocks/vtd: Add VT-d block with DMA protection API
Add new common block with VT-d/IOMMU support. The patch adds an
option to enable DMA protection with PMR. However the payload and
OS must support VT-d in order to properly handle I/O devices.
TEST=Enable DMA protection on MSI PRO Z690-A DDR4 and observe
the I/O devices like USB and NVMe fail to enumerate in UEFI
Payload (basically proving that DMA protection works).
Signed-off-by: Michał Żygowski <michal.zygowski@3mdeb.com>
Change-Id: Id7edf982457c1139624e5cd383788eda41d6a948
Reviewed-on: https://review.coreboot.org/c/coreboot/+/68449
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Eric Lai <eric_lai@quanta.corp-partner.google.com>
Reviewed-by: Michał Kopeć <michal.kopec@3mdeb.com>
Diffstat (limited to 'src/soc/intel/common/block/include')
| -rw-r--r-- | src/soc/intel/common/block/include/intelblocks/vtd.h | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/src/soc/intel/common/block/include/intelblocks/vtd.h b/src/soc/intel/common/block/include/intelblocks/vtd.h new file mode 100644 index 0000000000..222101a244 --- /dev/null +++ b/src/soc/intel/common/block/include/intelblocks/vtd.h @@ -0,0 +1,17 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ + +#ifndef SOC_INTEL_COMMON_BLOCK_VTD_H +#define SOC_INTEL_COMMON_BLOCK_VTD_H + +#include <stdint.h> + +/* + * Enable DMA protection by setting PMR registers in VT-d for whole DRAM memory. + */ +void vtd_enable_dma_protection(void); +/* + * Get DMA buffer base and size. + */ +void *vtd_get_dma_buffer(size_t *size); + +#endif /* SOC_INTEL_COMMON_BLOCK_VTD_H */ |