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Subjecthdparm and DMA
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I'm testing IDE hotswap using hdparm's ability to reset the IDE bus.
Problem is, even though it seems to work I can' re-enable DMA on the drive afterwards without a reboot.
This is similar to a problems I had with the via8xxxx module which when compiled as module couldn't get DMA going either.

I'm running 2.4.23. And here's the two different IDE reports:

Boot messages where DMA is fine:
Dec 9 05:21:04 picard kernel: Uniform Multi-Platform E-IDE driver Revision: 7.00beta4-2.4
Dec 9 05:21:04 picard kernel: ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx
Dec 9 05:21:04 picard kernel: VP_IDE: IDE controller at PCI slot 00:11.1
Dec 9 05:21:04 picard kernel: VP_IDE: chipset revision 6
Dec 9 05:21:04 picard kernel: VP_IDE: not 100%% native mode: will probe irqs later
Dec 9 05:21:04 picard kernel: ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx
Dec 9 05:21:04 picard kernel: VP_IDE: VIA vt8235 (rev 00) IDE UDMA133 controller on pci00:11.1
Dec 9 05:21:04 picard kernel: ide0: BM-DMA at 0xc000-0xc007, BIOS settings: hda:DMA, hdb:pio
Dec 9 05:21:04 picard kernel: ide1: BM-DMA at 0xc008-0xc00f, BIOS settings: hdc:DMA, hdd:pio
Dec 9 05:21:04 picard kernel: hda: 234441648 sectors (120034 MB) w/2048KiB Cache, CHS=232581/16/63, UDMA(100)
Dec 9 05:21:04 picard kernel: hdc: 234441648 sectors (120034 MB) w/8192KiB Cache, CHS=14593/255/63, UDMA(100)

After running idectl to add remove and add the drive back to the IDE bus.
Dec 8 08:04:16 picard kernel: hdc: WDC WD1200JB-00DUA3, ATA DISK drive
Dec 8 08:04:16 picard kernel: ide1 at 0x170-0x177,0x376 on irq 15
Dec 8 08:04:16 picard kernel: hdc: attached ide-disk driver.

And trying to turn DMA on produces:
hdparm -d 1 /dev/hdc

/dev/hdc:
setting using_dma to 1 (on)
HDIO_SET_DMA failed: Operation not permitted
using_dma = 0 (off)

Also I end up with multiple ide1 entreis in /proc/ide (one for every time I re-add the drive):
drivers hda@ hdc@ ide0/ ide1/ ide1/ via

So it looks like the reset is not occuring on the VIA but on the higher level IDE bus.

Here's the idectl script from hdparm-5.4
#!/bin/sh

HDPARM=/sbin/hdparm
MAX_IDE_NR=1

IDE_IO_0=0x1f0
IDE_IO_1=0x170

USE_IDE_DEV_0=/dev/hdc
USE_IDE_DEV_1=/dev/hda

usage () {
if [ $# -gt 0 ]; then
echo $* >&2
echo
fi

echo "usage: $0 ide-channel-nr [off|on|rescan]" 2>&1
exit 1
}

IDE_NR=$1
MODE=$2

do_register=0
do_unregister=0


if [ ! "$IDE_NR" ] || [ $IDE_NR -lt 0 ] || [ $IDE_NR -gt $MAX_IDE_NR ]; then
usage "Unrecognized IDE-channel number"
fi

case "$MODE" in
on ) do_register=1 ;;
off ) do_unregister=1 ;;
rescan ) do_unregister=1; do_register=1 ;;
* ) usage "Unrecognized command" ;;
esac

eval "IDE_IO=\$IDE_IO_$IDE_NR"
eval "USE_IDE_DEV=\$USE_IDE_DEV_$IDE_NR"

[ $do_unregister -eq 1 ] && eval "$HDPARM -U $IDE_NR $USE_IDE_DEV > /dev/null"
[ $do_register -eq 1 ] && eval "$HDPARM -R $IDE_IO 0 0 $USE_IDE_DEV > /dev/null"

ioctl(3, 0x326, 0x1) = 0
ioctl(3, 0x30b, 0x8053664) = 0
write(1, " using_dma = 1 (on)\n", 24 using_dma = 1 (on)
) = 24


Michael D. Black mblack@csi-inc.com
http://www.csi-inc.com/
http://www.csi-inc.com/~mike
321-676-2923, x203
Melbourne FL
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