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vmm: Add ID mappings in IORT Root Complex Nodes

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Signed-off-by: Michael Zhao <michael.zhao@arm.com>
This commit is contained in:
Michael Zhao 2021-11-18 12:57:38 +08:00 committed by Xin Wang
parent fad29fdf1a
commit b0d245be70
1 changed files with 19 additions and 6 deletions
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25
vmm/src/acpi.rs
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@ -407,12 +407,12 @@ fn create_iort_table(pci_segments: &[PciSegment]) -> Sdt {
const ACPI_IORT_NODE_ITS_GROUP: u8 = 0x00;
const ACPI_IORT_NODE_PCI_ROOT_COMPLEX: u8 = 0x02;
const ACPI_IORT_NODE_ROOT_COMPLEX_OFFSET: usize = 72;
const ACPI_IORT_NODE_ROOT_COMPLEX_SIZE: usize = 52;
const ACPI_IORT_NODE_ROOT_COMPLEX_SIZE: usize = 60;
// The IORT table containes:
// - Header (size = 40)
// - 1 x ITS Group Node (size = 24)
// - N x Root Complex Node (N = number of pci segments, size = 52 x N)
// - N x Root Complex Node (N = number of pci segments, size = 60 x N)
let iort_table_size: u32 = (ACPI_IORT_NODE_ROOT_COMPLEX_OFFSET
+ ACPI_IORT_NODE_ROOT_COMPLEX_SIZE * pci_segments.len())
as u32;
@ -442,18 +442,31 @@ fn create_iort_table(pci_segments: &[PciSegment]) -> Sdt {
// Mapping counts
iort.write(node_offset + 8, (1u32).to_le());
// Offset from the start of the RC node to the start of its Array of ID mappings
iort.write(node_offset + 12, (32u32).to_le());
iort.write(node_offset + 12, (36u32).to_le());
// Fully coherent device
iort.write(node_offset + 16, (1u32).to_le());
// CCA = CPM = DCAS = 1
iort.write(node_offset + 24, 3u8);
// PCI segment number
iort.write(node_offset + 28, (segment.id as u32).to_le());
// Identity RID mapping covering the whole input RID range
iort.write(node_offset + 36, (0xffff_u32).to_le());
// From offset 32 onward is the space for ID mappings Array.
// Now we have only one mapping.
let mapping_offset: usize = node_offset + 36;
// The lowest value in the input range
iort.write(mapping_offset, (0u32).to_le());
// The number of IDs in the range minus one:
// This should cover all the devices of a segment:
// 1 (bus) x 32 (devices) x 8 (functions) = 256
// Note: Currently only 1 bus is supported in a segment.
iort.write(mapping_offset + 4, (255_u32).to_le());
// The lowest value in the output range
iort.write(mapping_offset + 8, ((256 * segment.id) as u32).to_le());
// id_mapping_array_output_reference should be
// the ITS group node (the first node) if no SMMU
iort.write(node_offset + 44, (48u32).to_le());
iort.write(mapping_offset + 12, (48u32).to_le());
// Flags
iort.write(mapping_offset + 16, (0u32).to_le());
}
iort.update_checksum();