Re: [Xen-devel] out of dma-memory when using usblp-module in driverdomain

["Jan Beulich" <jbeulich@xxxxxxxxxx>]

>>> Patrick Scharrenberg <pittipatti@xxxxxx> 25.03.07 16:29 >>>
>I tried attaching an usb-printer to an usb-port of a driver-domain.
>On loading the module usblp I get the following error:
>
>    /usr/src/xen/xen-unstable.hg/linux-2.6.18-xen/drivers/usb/class/usblp.c:
>    out of memory for write buf
>    usblp: probe of 2-1:1.0 failed with error -5
>
>I figured out, that reducing USBLP_BUF_SIZE (usb/class/usblp.c) form
>8192 to some smaller value, e.g. 4096 it works fine, but that's just a
>workaround.
>
>USBLP_BUF_SIZE is used to "usb_buffer_alloc" (usb/core/usb.c) dma memory:
>
>>From usb.c:
>     usb_buffer_alloc - allocate dma-consistent buffer for
>URB_NO_xxx_DMA_MAP
>
>but here I'm out..

Probably you're just suffering from domains without any I/O memory ranges
assigned not being permitted to have multi-page contiguous memory ranges
assigned? If not, do you force swiotlb on in the domain? And what resources
does the USB HC require?

Jan

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