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aarch64: fdt: Create MSI mapping for PCI nodes

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Each PCI device under a root complex is uniquely identified by its
Requester ID (AKA RID). A Requester ID is a triplet of a Bus number,
Device number, and Function number.

MSIs may be distinguished in part through the use of sideband data
accompanying writes. In the case of PCI devices, this sideband data
may be derived from the Requester ID. A mechanism is required to
associate a device with both the MSI controllers it can address,
and the sideband data that will be associated with its writes to
those controllers.

This commit adds the `msi-map` property for PCI nodes, therefore
creating MSI mapping for each PCI device.

Signed-off-by: Henry Wang <Henry.Wang@arm.com>
This commit is contained in:
Henry Wang 2021-11-28 01:47:09 -05:00 committed by Rob Bradford
parent ca9a42ece8
commit 90df54a245
1 changed files with 14 additions and 0 deletions
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14
arch/src/aarch64/fdt.rs
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@ -608,6 +608,19 @@ fn create_pci_nodes(
pci_device_info_elem.mmio_config_address,
PCI_MMIO_CONFIG_SIZE_PER_SEGMENT,
];
// See kernel document Documentation/devicetree/bindings/pci/pci-msi.txt
let msi_map = [
// rid-base: A single cell describing the first RID matched by the entry.
0x0,
// msi-controller: A single phandle to an MSI controller.
MSI_PHANDLE,
// msi-base: An msi-specifier describing the msi-specifier produced for the
// first RID matched by the entry.
(pci_device_info_elem.pci_segment_id as u32) << 8,
// length: A single cell describing how many consecutive RIDs are matched
// following the rid-base.
0x100,
];
let pci_node_name = format!("pci@{:x}", pci_device_info_elem.mmio_config_address);
let pci_node = fdt.begin_node(&pci_node_name)?;
@ -627,6 +640,7 @@ fn create_pci_nodes(
fdt.property_null("interrupt-map")?;
fdt.property_null("interrupt-map-mask")?;
fdt.property_null("dma-coherent")?;
fdt.property_array_u32("msi-map", &msi_map)?;
fdt.property_u32("msi-parent", MSI_PHANDLE)?;
if pci_device_info_elem.pci_segment_id == 0 {