AMD-Vi: Enabling IOMMU at 0000:00:00.2 cap 0x40 BUG: unable to handle kernel NULL pointer dereference at 0000000000000198
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From: Sander Eikelenboom on 10 Aug 2010 17:50 Hi Joerg, Ok it boots ok now, but plugging in a USB device in the 2.0 controller (0a.01.*) results in a flood of error messages about the usb controller not functioning. When running same kernel with amd_iommu=off results in ...the device at least registering properly as usb device (altough trying to use it now resulted in an entirely new oops probably in the driver of the videograbber.) -- Sander Tuesday, August 10, 2010, 11:25:51 PM, you wrote: > On Tue, Aug 10, 2010 at 10:57:26PM +0200, Sander Eikelenboom wrote: >> Hmmm the fun part seems to be .. that the usb devices on that usb2 >> controller seemed to work fine on Xen. > Hmm, thats weird. In this case these devices probably do not alias at > all. But lets wait for the results when you test my patch. >> +-0a.0-[0000:09-0a]----00.0-[0000:0a]--+-01.0 >> | +-01.1 >> | \-01.2 > Yeah, device 09:00.0 is a PCIe-to-PCI bridge and the addtional USB > controlers are behind that bridge as legacy PCI devices. Thats why the > BIOS sets up the alias-entry. It should set up 09:00.0 instead of > 0a:00.0 to make things work correctly. > Joerg -- Best regards, Sander mailto:linux(a)eikelenboom.it -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
From: Sander Eikelenboom on 11 Aug 2010 14:00
Hello Joerg, Had to apply the patch by hand, and found 2 typo's: arch/x86/kernel/amd_iommu.c: In function �do_attach�: arch/x86/kernel/amd_iommu.c:1456: error: implicit declaration of function �set_dte_enry� arch/x86/kernel/amd_iommu.c: In function �do_detach�: arch/x86/kernel/amd_iommu.c:1486: error: implicit declaration of function �clear_dte_enry� make[2]: *** [arch/x86/kernel/amd_iommu.o] Error 1 Should be "entry" of course. -- Sander Wednesday, August 11, 2010, 12:24:19 AM, you wrote: > On Tue, Aug 10, 2010 at 11:36:59PM +0200, Sander Eikelenboom wrote: >> It boots now, dmesg attached. > Ok, here is a quick and dirty patch wich should make your system boot > again. It introduces other issues which will show up when you try to > assign the devices to a virtual machine. But at least the devices should > work again on bare-metal. > Joerg -- Best regards, Sander mailto:linux(a)eikelenboom.it -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ |