From: Xiaochun Lee <lixc17@xxxxxxxxxx> The device [8086:a26c] is a Power Control Unit of Intel Ice Lake Server Processor and devices [8086:a1ec,a1ed] are the Power Control Unit of Intel Xeon Scalable Processor, kernel treats their pci BARs as a base address register that leading to a boot failure like: "pci 0000:00:11.0: [Firmware Bug]: reg 0x30: invalid BAR (can't size)". The symptoms in Ice Lake processor is: "QU99 ICE LAKE ES1 HCC 24C 185W 3200 L-0" The information of the device [8086:a26c] list as below: 00:11.0 Unassigned class [ff00]: Intel Corporation Device a26c (rev 03) Subsystem: Lenovo Device 7811 Flags: fast devsel, NUMA node 0 Expansion ROM at <ignored> [disabled] Capabilities: [80] Power Management version 3 The symptoms in Xeon Scalable Processor is: "Intel(R) Xeon(R) Gold 5117 CPU @ 2.00GHz" "Intel(R) Xeon(R) Gold 6252 CPU @ 2.00GHz" The information of the Device [8086:a1ec] list as below: 00:11.0 Unassigned class [ff00]: Intel Corporation C620 Series Chipset Family MROM 0 [8086:a1ec] (rev 09) Subsystem: Lenovo Device [17aa:7805] Latency: 0, Cache Line Size: 64 bytes NUMA node: 0 Expansion ROM at <ignored> [disabled] Capabilities: [80] Power Management version 3 There are no other BARs on this devices, so mark the PCU as having non-compliant BARs, therefore we don't try to probe any of them. Signed-off-by: Xiaochun Lee <lixc17@xxxxxxxxxx> --- arch/x86/pci/fixup.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/arch/x86/pci/fixup.c b/arch/x86/pci/fixup.c index e723559..d9abc67 100644 --- a/arch/x86/pci/fixup.c +++ b/arch/x86/pci/fixup.c @@ -563,6 +563,9 @@ static void twinhead_reserve_killing_zone(struct pci_dev *dev) * Erratum BDF2 * PCI BARs in the Home Agent Will Return Non-Zero Values During Enumeration * http://www.intel.com/content/www/us/en/processors/xeon/xeon-e5-v4-spec-update.html + * + * Device [8086:a26c] + * Devices [8086:a1ec,a1ed] */ static void pci_invalid_bar(struct pci_dev *dev) { @@ -572,6 +575,9 @@ static void pci_invalid_bar(struct pci_dev *dev) DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_INTEL, 0x6f60, pci_invalid_bar); DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_INTEL, 0x6fa0, pci_invalid_bar); DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_INTEL, 0x6fc0, pci_invalid_bar); +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_INTEL, 0xa1ec, pci_invalid_bar); +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_INTEL, 0xa1ed, pci_invalid_bar); +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_INTEL, 0xa26c, pci_invalid_bar); /* * Device [1022:7808] -- 1.8.3.1
