Re: [Pkg-xen-devel] ioatdma: Boot process hangs then reboots when using Xen + Linux 3.2

[Bastian Blank <waldi@debian.org>]

On Fri, Mar 02, 2012 at 11:31:56AM -0800, Dan Williams wrote:
> On Fri, Mar 2, 2012 at 9:57 AM, Bastian Blank <waldi@debian.org> wrote:
> > phys_complete (a 32 bit value) gets compared to struct
> > dma_async_tx_descriptor.phys, which is defined as dma_addr_t, a _64_ bit
> > value.
> The assumption is that the driver's control structures are not in high
> memory so all address values will only have 32-bits of valid data,

Can you back that up by some kernel documentation? There is a reason why
pci_alloc_pool uses dma_addr_t to store the address and _not_ unsigned
long. This are physical addresses, nothing the kernel can access
directly without a mapping.

>                                                                    but
> maybe xen32 changes that assumption?

Xen changes a lot of things in the memory management. This includes that
physical != machine addresses, where i915 failed horrible.

> Can you send the log of the driver load with debug enabled?

No, I don't have that hardware.

Bastian

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