Messages in this thread | | | Date | Fri, 6 Mar 2009 12:59:48 -0800 | Subject | Re: [PATCH] hpsa: SCSI driver for HP Smart Array controllers | From | Grant Grundler <> |
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On Fri, Mar 6, 2009 at 6:38 AM, <scameron@beardog.cca.cpqcorp.net> wrote: ... > The command buffers have to be in the first 4GB of memory, as the command > register is only 32 bits, so they are allocated by pci_alloc_consistent.
Huh?!! ISTR the mpt2sas driver is indicating it can handle 64-bit DMA masks for both streaming and control data. I need to double check to be sure of that.
> However, the chained SG lists don't have that limitation, so I think they > can be kmalloc'ed, and so not chew up and unreasonable amount of the > pci_alloc_consistent memory and get a larger number of SGs. ...right? > Maybe that's the better way to do it.
I thought the driver was tracking this and using the appropriate construct based on which DMA mask is in effect.
hth, grant
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