Re: [ANNOUNCE][PATCH 2.6.11 2/3] megaraid_sas: Announcing new mod ule for LSI Logic's SAS based MegaRAID controllers

From: 'Christoph Hellwig'
Date: Wed Mar 09 2005 - 17:11:35 EST

On Wed, Mar 09, 2005 at 09:43:47AM -0500, Bagalkote, Sreenivas wrote:
> During the module load time, I allocate 32 bit or 64 bit SGLs based on
> whether I can receive 64 bit DMA addresses or not. If size of dma_addr_t
> is 4, then I allocate only 32 bit SGLs. During the run time, I prepare
> 32/64 bit SGLs based on this variable. And since this is compile time
> system-wide property, I kept it as driver global.

Even for kernels with a 64bit dma_addr_t you can get 32bit dma addresses
only. As a start check whether the pci_set_dma_mask for the 64bit mask
failed - in that case you can always use 32bit SGLs.
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