Re: [PATCH V3 19/21] pci, acpi: Support for ACPI based generic PCI host controller init

From: Tomasz Nowicki
Date: Mon Jan 18 2016 - 05:36:39 EST

On 18.01.2016 10:25, liudongdong (C) wrote:
I see here is different from V2 patch,
in V2 patch, 0x0000022004000000 is cpu addr.
but in V3 patch, 0x0000022004000000 is pci addr.
which one is right ?

You are right, I look back at v2 and see bug there. But v3 fixes it, for MEM & IO we always need to calculate this way:
CPU address defined as: cpu_addr = res->start + entry->offset;
PCI address: pci_addr = res->start;

0x0000022004000000 is the value of AddressMinimum.
AddressMinimum evaluates to a 64-bit integer that specifies the lowest
possible base address of the Memory range
QWordMemory ( // 64-bit BAR Windows
ResourceProducer, PosDecode,
MinFixed, MaxFixed,
Cacheable, ReadWrite,
0x000000000000000, // Granularity
0x0000022004000000, // Min Base Address
0x000002200fffffff, // Max Base Address
0x0000021ff9000000, // Translate
0x000000000c000000 // Length

For your case:
cpu_addr = 0x0000022004000000 + 0x0000021ff9000000:
pci_addr = 0x0000022004000000;