zero-bounce highmem I/O, 2.4.9

Hi,

I've put up an updated patch for 2.4.9, which incorporates the PCI DMA changes made by davem and me. Changes since the last version:

- bh_bus -> bh_phys (davem)
- Merge davem's pci64 patch (me, davem)
- IPS highmem update (Peter Wong, me)
- Megaraid highmem flag addition (me)
- Debug print queue I/O bounce settings
- blk_seg_merge_ok -- always make sure that a segment doesn't cross a 4GB boundary.
- Set queue bounce based on PCI DMA mask
- qlogicfc converted to pci64 DMA interface (davem)
- SCSI alt_address gone for good (davem)

Maybe some more stuff, I forget...

*.kernel.org/pub/linux/kernel/people/axboe/patches/2.4.9/block-highmem-all-9

cciss needs to incremental cciss-bh_phys-1 on top to compile, obvious bug discovered after patch upload...

Jens Axboe

Hi,

DaveM was all over me, new patch is up. Changes:

- Add BLK_BOUNCE_ANY for hw that can access all of memory with the aid of remapping hardware - PCI_DMA_BUS_IS_PHYS (davem)
- Make blk_queue_bounce_limit 64-bit ok (davem)
- Remove redundant ifdef HIGHMEM (davem)
- Include cciss bh_phys fix (me)

*.kernel.org/pub/linux/kernel/people/axboe/patches/2.4.9/block-highmem-all-10

Jens Axboe