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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 <>
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,
   alignment=4096, boundary=8192.
 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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