Re: [Xen-devel] xen_create_contiguous_region - Regarding

[Jambunathan K <jambunathan@xxxxxxxxxx>]

>> pci_map_single() will do what you want automatically. If you really want to
>> allocate contiguous memory yourself, allocate it then call
>> xen_create_contiguous_region().

Could you please export xen_create_contiguous_region for wider use?

Jambunathan K.


Keir Fraser wrote:
> On 6/4/07 11:46, "Jambunathan K" <jambunathan@xxxxxxxxxx> wrote:
> 
>> Given that we prefer to maintain our own bounce buffers, I could neither
>> find a dependable API that let the driver allocate machine contiguous
>> memory (that could later be *pci_map_singled*) nor find a suitable hook
>> to xen_create_contiguous_region.
> 
> pci_map_single() will do what you want automatically. If you really want to
> allocate contiguous memory yourself, allocate it then call
> xen_create_contiguous_region().
> 
>> As an aside, is there a tweak to "increase" contiguous memory regions
>> available so that xen_create_contiguous_regions() succeeds. On DomUs,
>> when swiotlb is enabled, I see some crashes which I would like to avoid
>> by redistributing memory resources.
> 
> Xen will try to maintain contiguity as far as possible, but it cannot
> defragment the memory map.
> 
>  -- Keir
> 
> 
> 
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