[+cc linux-pci] On Wed, Jun 2, 2021 at 4:49 PM Qian Cai <quic_qiancai@xxxxxxxxxxx> wrote: > > Bjorn, I noticed PCI ECAM could be reserved twice on arm64. Firs time through, > > [ 19.087790][ T1] acpi_ns_walk_namespace+0xc0/0x390 > [ 19.092927][ T1] acpi_get_devices+0x160/0x1a4 > [ 19.097629][ T1] acpi_resource_consumer+0x8c/0xc0 > [ 19.102680][ T1] pci_acpi_scan_root+0x158/0x4c8 > [ 19.107555][ T1] acpi_pci_root_add+0x450/0x8e8 > [ 19.112345][ T1] acpi_bus_attach+0x300/0x7d0 > [ 19.116960][ T1] acpi_bus_attach+0x178/0x7d0 > [ 19.121576][ T1] acpi_bus_attach+0x178/0x7d0 > [ 19.126190][ T1] acpi_bus_scan+0xa8/0x170 > [ 19.130545][ T1] acpi_scan_init+0x220/0x558 > [ 19.135074][ T1] acpi_init+0x1f4/0x270 > > where pci_acpi_setup_ecam_mapping() confirmed all reservations are succeed. Then, > > [ 19.880588][ T1] acpi_ns_walk_namespace+0xc0/0x390 > [ 19.885725][ T1] acpi_get_devices+0x160/0x1a4 > [ 19.890426][ T1] pnpacpi_init+0xa0/0x10 > > As the results, those messages are showed up during the boot in pnpacpi_init(). > > [ 17.763968] system 00:00: [mem 0x10000000000-0x1000fffffff window] could not be reserved > [ 17.772900] system 00:00: [mem 0x7800000000-0x780fffffff window] could not be reserved > [ 17.781627] system 00:00: [mem 0x7000000000-0x700fffffff window] could not be reserved > [ 17.790350] system 00:00: [mem 0x6000000000-0x600fffffff window] could not be reserved > [ 17.799073] system 00:00: [mem 0x5800000000-0x580fffffff window] could not be reserved > [ 17.808155] system 00:00: [mem 0x1000000000-0x100fffffff window] could not be reserved > [ 17.816862] system 00:00: [mem 0x600000000-0x60fffffff window] could not be reserved > [ 17.825417] system 00:00: [mem 0x400000000-0x40fffffff window] could not be reserved > > Looking through the x86's version of pci_acpi_scan_root(), it won't call acpi_resource_consumer(), so I suppose this bug is only affecting arm64? This might be related to https://lore.kernel.org/linux-acpi/20210510234020.1330087-1-luzmaximilian@xxxxxxxxx/T/#u Can you try applying that patch to see if it is related? Bjorn
