Messages in this thread | | | Date | Sun, 4 Nov 2001 19:51:45 +0100 | From | Jens Axboe <> | Subject | Re: SYM-2 patches against latest kernels available |
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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...
> 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 :-)
-- Jens Axboe
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