[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] RE: [Xen-devel] IOMMU support: __direct_remap_pfn_range() fails
> What's calling direct_remap_page_range? call stack is __direct_remap_page_range __ioremap ioremap_nocache agp_generic_create_gatt_table agp_backend_initialization etc, etc. the memory that is being remapped is allocated in drivers/char/agp/generic.c:agp_generic_create_gatt_table() by a call to alloc_gatt_pages() (which is just a #define of __get_free_pages on x86_64). > My suspicion is that the driver is allocating some memory and > then calling ioremap on it, which isn't a good thing to do as > its not MMIO memory. You can get away with this on native, > but not Xen. > > Can you point us at the appropriate section of the driver code. See above. How do I fix this? Thanks for the help. -Mark Langsdorf AMD, Inc. > > > > I am working on getting IOMMU support for AMD64. > > > > ...the agpgart code is still failing. > > > > > > > > I have tracked the problem down to line 92 of ioremap.c, in > > > > __direct_remap_pfn_range(). > > > > The failing instruction is a call to HYPERVISOR_mmu_update(). > > > > > > What are the arguments to direct_remap_pfn_range? > > > > struct struct_mm *mm = 0x804c9540 > > unsigned long address = 80000 > > unsigned long mfn = 4280 > > unsigned long size = 80000 > > pgprot_t prot = 77 > > domid_t domid = 7ff1 > > > > The arguments the HYPERVISOR call are > > u = 43418 > > v - u = 800 > > domid = 7ff1 > > > > > With a verbose=y build of Xen what debug output do you > get from xen > > > (on the serial line). > > > > (XEN) (file=/usr/src/xen-unstable/xen-source/xen/include/asm/mm.h, > > line=202) > > Error pfn 4280: rd=ffff8300001c7080, od=0000000000000000, > > caf=00000000, > > taf=0000000000000006 > > > > If I'm reading asm/mm.h:get_page() right, it's failing > > because the page->count_info is 0, but I don't know who set > > that value or if that's meaningful. > > > > -Mark Langsdorf > > AMD, Inc. > > > > > > _______________________________________________ > Xen-devel mailing list > Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel > > _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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