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Re: port-amd64/42980: satalink DMA fails under amd64
The following reply was made to PR port-amd64/42980; it has been noted by GNATS.
From: Julian Bourne <julian.bourne%gmail.com@localhost>
Subject: Re: port-amd64/42980: satalink DMA fails under amd64
Date: Thu, 18 Mar 2010 14:27:42 -0400
OK, I verified several things with the 5.0.2 kernel:
(1) amd64 GENERIC (non xen) suffers as well
(2) amd64 XEN_DOM0 suffers with or without Manuel's patch
(3) uvm_pglistalloc has the boundary >= size check as well
See trace I added to the code from my kernel logs:
uvm_pglistalloc failed error=22, size=65536,
satalink0:0: unable to create xfer table DMA map
for drive 0, error=22
wd0(satalink0:0:0): using PIO mode 4
Hope that helps.
If I can throw in 2c, I think the problem is that the bouncebuf
create call should be using the max segment size from the sc
structure, not MAXPHYS, but I admit, I'm way out of my depth.
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