diff options
| author | Yazen Ghannam <yazen.ghannam@amd.com> | 2024-12-06 16:11:59 +0000 |
|---|---|---|
| committer | Borislav Petkov (AMD) <bp@alien8.de> | 2025-01-08 10:48:03 +0100 |
| commit | 40a5f6ffdfc8f8ed0d8c535dfa3733b31c66a88c (patch) | |
| tree | 102d04fd9f83ceaa4b294d826983b7f9e2a69f25 /arch/x86/include/asm/amd_node.h | |
| parent | 962f1970a32430ce6c75ea23cbc59d68346481fd (diff) | |
x86/amd_nb: Simplify root device search
The "root" device search was introduced to support SMN access for Zen
systems. This device represents a PCIe root complex. It is not the
same as the "CPU/node" devices found at slots 0x18-0x1F.
There may be multiple PCIe root complexes within an AMD node. Such is
the case with server or High-end Desktop (HEDT) systems, etc. Therefore
it is not enough to assume "root <-> AMD node" is a 1-to-1 association.
Currently, this is handled by skipping "extra" root complexes during the
search. However, the hardware provides the PCI bus number of an AMD
node's root device.
Use the hardware info to get the root device's bus and drop the extra
search code and PCI IDs.
Signed-off-by: Yazen Ghannam <yazen.ghannam@amd.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/20241206161210.163701-7-yazen.ghannam@amd.com
Diffstat (limited to 'arch/x86/include/asm/amd_node.h')
| -rw-r--r-- | arch/x86/include/asm/amd_node.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/x86/include/asm/amd_node.h b/arch/x86/include/asm/amd_node.h index 622bd3038eeb..3f097dd479f8 100644 --- a/arch/x86/include/asm/amd_node.h +++ b/arch/x86/include/asm/amd_node.h @@ -23,5 +23,6 @@ #define AMD_NODE0_PCI_SLOT 0x18 struct pci_dev *amd_node_get_func(u16 node, u8 func); +struct pci_dev *amd_node_get_root(u16 node); #endif /*_ASM_X86_AMD_NODE_H_*/ |