Messages in this thread | | | Date | Sun, 4 Nov 2001 17:56:21 +0100 (CET) | From | Gérard Roudier <> | Subject | Re: SYM-2 patches against latest kernels available |
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On Sun, 4 Nov 2001, Jens Axboe wrote:
> On Sun, Nov 04 2001, G?rard Roudier wrote: > > > > > > On Sun, 4 Nov 2001, Jeff Garzik wrote: > > > > > Gérard Roudier wrote: > > > > The patch against linux-2.4.13 has been sent to Alan Cox for inclusion in > > > > newer stable kernels. Alan wants to test it on his machines which is a > > > > good thing. Anyway, those patches just add the new driver version to > > > > kernel tree and leave stock sym53c8xx and ncr53c8xx in place. > > > > > > Are the older sym/ncr drivers going away in 2.5? > > > > > > > > > > Any report, especially on large memory machines using 64 bit DMA (2.4 > > > > kernels + PCI DAC capable controllers only), is welcome. I can't test 64 > > > > bit DMA, since my fatest machine has only 512 MB of memory. > > > > > > > > To configure the driver, you must select "SYM53C8XX version 2 driver" from > > > > kernel config. For large memory machines, a new "DMA addressing mode" > > > > option is to be configured as follows (help texts have been added to > > > > Configure.help): > > > > > > > > Value 0: 32 bit DMA addressing > > > > Value 1: 40 bit DMA addressing (upper 24 bytes set to zero) > > > > Value 2: 64 bit DMA addressing limited to 16 segments of 4 GB (64 GB) max. > > > > > > Are you using the new pci64 API under 2.4.x? > > > > Didn't see any. Only the dma_addr_t thing can be 32 bit or 64 bit > > depending on some magic. Apart this, the driver is asking for the > > appropriate dma mask given the configured dma adressing mode. > > I've looked over the sym-2 and it is using pci_map_sg so it's 64-bit > safe for sg transfers at least. For non-sg requests you are using > pci_map_single, but you can't do any better because the mid layer is > handing you virtual addresses in request_buffer currently anyways...
If there is some platform-specific thing that allows to handle map_single more right:), I can go with it. Would be fine to get IA64 and Alpha actually PCI-64 bit safe even by using some software shoehorn for that. :)
> > PS: There is some pci64* API on some arch., but nobody will want to > > ever use it, in my opinion. > > You are doing it right :-)
You mean as right as possible? :)
Gérard.
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