xen-swiotlb: Retry up three times to allocate Xen-SWIOTLB

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We can fail seting up Xen-SWIOTLB if:
 - The host does not have enough contiguous DMA32 memory available
   (can happen on a machine that has fragmented memory from starting,
   stopping many guests).
 - Not enough low memory (almost never happens).

We retry allocating and exchanging the swath of contiguous memory
up to three times. Each time we decrease the amount we need  - the
minimum being of 2MB.

If we compleltly fail, we will print the reason for failure on the Xen
console on top of doing it to earlyprintk=xen console.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

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Konrad Rzeszutek Wilk 2011-07-22 12:46:43 -04:00

parent 917e3e65c3

commit f4b2f07b2e

1 changed files with 25 additions and 10 deletions

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drivers/xen/swiotlb-xen.c

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