Hi Bjorn, This was originally the method I used to test hotplug on Intel SDV machines which are not capable of doing hotplug. I would like to present it here in case it interests the community, then it can be made available to a wider range of developers who are working on hotplug. I used it to generate desired ACPI events, PCI interrupts, and more. So things like CPU hotplug, IOH hotplug, memory hotplug, PCI native hotplug, PCI AER injection can be emulated and tested easily. The best thing is that, it doesn't require any modification to those drivers involved. It works with whatever hardware events that the user can imagine. Further development in user-space using scripts may help simplify the usage model and add more software-defined logic on hardware. Because it modifies the heart of all h/w access functions, I used Jump Label to reduce the performance penalty to effectively zero. I tested the performance by repeatedly running lspci, which calls into the pci access functions. There's no added overhead observed. Regards, Rui Wang Intel Open Source Technology Center Rui Wang (3): IO Hook: core functions and Register Override IO Hook: kernel interface to manage the hook IO Hook: sysfs interface to emulate h/w events Documentation/PCI/iohook.txt | 290 +++++++++++++++++ arch/x86/Kconfig | 7 + arch/x86/boot/compressed/Makefile | 1 + arch/x86/include/asm/io.h | 58 ++++- arch/x86/vdso/Makefile | 2 + drivers/misc/Kconfig | 1 + drivers/misc/Makefile | 1 + drivers/misc/iohook/Kconfig | 5 + drivers/misc/iohook/Makefile | 1 + drivers/misc/iohook/iohook.c | 503 +++++++++++++++++++++++++++++ drivers/pci/access.c | 630 +++++++++++++++++++++++++++++++++++++ include/linux/reg_ovrd.h | 55 ++++ 12 files changed, 1552 insertions(+), 2 deletions(-) create mode 100644 Documentation/PCI/iohook.txt create mode 100644 drivers/misc/iohook/Kconfig create mode 100644 drivers/misc/iohook/Makefile create mode 100644 drivers/misc/iohook/iohook.c create mode 100644 include/linux/reg_ovrd.h -- 1.7.5.4 -- 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
