Messages in this thread | | | Date | Tue, 14 Oct 2008 20:14:44 +0900 | Subject | Re: USB problem on x86_64: nommu_map_single() issue? | From | FUJITA Tomonori <> |
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On Tue, 14 Oct 2008 13:05:39 +0200 Nicolas Bareil <nico@chdir.org> wrote:
> On Tue, Oct 14, 2008 at 08:00:09PM +0900, FUJITA Tomonori wrote: > > > > Is this a regression? Did it work on earlier kernels? > > > > > > Yes this is a regression: USB works in 2.6.26.x with (almost) the same configuration. > > > > With old kernels, you can find something like the following line in > > the boot log? > > > > PCI-DMA: Using software bounce buffering for IO (SWIOTLB) > > Indeed, I have this line: > > Oct 14 12:46:29 brew kernel: [ 0.004000] Calgary: detecting Calgary via BIOS EBDA area > Oct 14 12:46:29 brew kernel: [ 0.004000] Calgary: Unable to locate Rio Grande table in EBDA - bailing! > Oct 14 12:46:29 brew kernel: [ 0.004000] PCI-DMA: Using software bounce buffering for IO (SWIOTLB) > Oct 14 12:46:29 brew kernel: [ 0.004000] Placing software IO TLB between 0x4000000 - 0x8000000 > Oct 14 12:46:29 brew kernel: [ 0.004000] Memory: 4055544k/4980736k available (2225k kernel code, 138092k reserved, 1079k data, 392k init) > Oct 14 12:46:29 brew kernel: [ 0.004000] CPA: page pool initialized 1 of 1 pages preallocated
Probably, the changes to the initial memory setup code breaks the following code:
void __init pci_swiotlb_init(void) { /* don't initialize swiotlb if iommu=off (no_iommu=1) */ if (!iommu_detected && !no_iommu && max_pfn > MAX_DMA32_PFN) swiotlb = 1;
SWIOTLB should be used for your box but somehow pci-nommu is used.
> The whole kern.log and my config are available here : > http://chdir.org/~nbareil/kern.log
The following part in the 2.6.27 boot log looks suspicious:
Oct 13 15:43:48 brew kernel: last_pfn = 0x130000 max_arch_pfn = 0x3ffffffff Oct 13 15:43:48 brew kernel: x86 PAT enabled: cpu 0, old 0x7040600070406, new 0x7010600070106 Oct 13 15:43:48 brew kernel: last_pfn = 0xcffc2 max_arch_pfn = 0x3ffffffff
CC'ed Yinghai and Ingo, who might have clues.
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