On Fri, Dec 18, 2015 at 06:56:39PM +0000, okaya@xxxxxxxxxxxxxx wrote: [...] > Here is what I have as an IO resource. > > QWORDIO( //Consumed-And-produced resource > ResourceProducer, // bit 0 of general flags is 0 > MinFixed, // Range is fixed > MaxFixed, // Range is fixed > PosDecode, > EntireRange, > 0x0000, // Granularity > 0x1000, // Min, 0 is not accepted > 0x10FFF, // Max > 0x8FFFFFEF000, // Translation > 0x10000, // Range Length > ,, PI00 > ) > > I don't have any type specified. > > I agree with Lorenzo's assessment. The min and max values represent the > PCI IO bus addresses. The translation offset is added to these values to > figure out the CPU view of the PCI IO range. > > The endpoints BAR addresses are programmed with IO addresses ranging > between 0x1000 and 0x10FFF for this example above. > > Here is another question. Chris Covington and I asked this question on a > private email to you but we didn't hear back. > > We were referring to a Linaro IO hack patch as we were not sure whether > this was a limitation of the hack or a general expectation for ARM64 PCI > in general. > > I'll repeat it here. > > I have multiple root ports with the same IO port configuration in the > current ACPI table. > > Root port 0 = IO range 0x1000-0x10FFF > Root port 1 = IO range 0x1000-0x10FFF > Root port 2 = IO range 0x1000-0x10FFF It is fine. You end up mapping for each of those a 4k window of the virtual address space allocated to IO and that's what you will have in the kernel PCI resources (not in the HW BARs though). If that was a problem it would be even for the current DT host controllers eg: arch/arm64/boot/dts/apm/apm-storm.dtsi it should not be (again I will let Arnd comment on this since he may be aware of issues encountered on other arches/platforms). Lorenzo > > Each root port can have the same IO address range configuration, are we > expecting IO port numbers to be unique across the whole system for ARM64? > > Something like > > Root port 0 = IO range 0x1000-0x10FFF > Root port 1 = IO range 0x11000-0x20FFF > Root port 2 = IO range 0x21000-0x30FFF > > since the IO addresses are being remapped into PCI IO range printed during > boot. > > PCI I/O : 0xffff7ffffae00000 - 0xffff7ffffbe00000 ( 16 MB) > > and each root port would remap to 64k of the 16MB range. > > > > > Any comments are very appreciated! > > > > Tomasz > > -- > > To unsubscribe from this list: send the line "unsubscribe linux-pci" in > > the body of a message to majordomo@xxxxxxxxxxxxxxx > > More majordomo info at http://vger.kernel.org/majordomo-info.html > > > > -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
