Hi Lorenzo, On 2016/1/19 20:20, Lorenzo Pieralisi wrote:
Gerry, On Wed, Jan 13, 2016 at 02:21:04PM +0100, Tomasz Nowicki wrote:From: Liu Jiang <jiang.liu@xxxxxxxxxxxxxxx> Some architectures, such as IA64 and ARM64, have no instructions to directly access PCI IO ports, so they map PCI IO ports into PCI MMIO address space. Typically PCI host bridges on those architectures take the responsibility to map (translate) PCI IO port transactions into Memory-Mapped IO transactions. ACPI specification provides support of such a usage case by using resource translation_offset. But current ACPI resource parsing interface isn't neutral enough, it still has some special logic for IA64. So refine the ACPI resource parsing interface and IA64 code to neutrally handle translation_offset by: 1) ACPI resource parsing interface doesn't do any translation, it just save the translation_offset to be used by arch code. 2) Arch code will do the mapping(translation) based on arch specific information. Typically it does: 2.a) Translate per PCI domain IO port address space into system global IO port address space. 2.b) Setup MMIO address mapping for IO ports.This patch fixes IO space handling on IA64 and should go in as a fix. IA64 PCI IO space is currently broken (Hanjun tested this on an IA64 box). The first broken commit is: 3772aea7d6f3 ("ia64/PCI/ACPI: Use common ACPI resource parsing interface for host bridge") because acpi core code checks (in acpi_dev_ioresource_flags()) the resource.end>=0x10003, which fails on ia64 - currently resource.end is set in acpi_decode_space() to: AddressMaximum + AddressTranslation where AddressTranslation is the CPU physical address mapping IO space on IA64, the >=0x10003 check in acpi_dev_ioresource_flags always triggers and the IO resource is then disabled. Do you want me to re-send this patch as a fix, with updated commit log ?
I talked to Gerry offline, he is busy these days, he said it's pretty OK for you to resend this patch and fix the problem. Thanks Hanjun -- 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
