2.4.21 can't set IDE DMA on harddrive (HDIO_SET_DMA failed: Operation not permitted)

["Jérôme Augé" <jauge@club-internet.fr>]

Hi,

I'm now using kernel 2.4.20-13.8 (from RH8) and 2.4.21-ck1 (from Con
Kolivas based on 2.4.21-rc6) and I'm unable to set the dma for my
harddrive with hdparm:

  # hdparm -d1 /dev/hda

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

Before these kernels I was using the 2.4.18 (from RH8 too) and
2.4.20-ck1 and setting DMA was working.

I checked my logs and found that the 2.4.21 kernel use E-IDE version
7.00beta[34]-.2.4 and the 2.4.20 one use version 6.31.

Looks like something went wrong in the IDE code regarding DMA settings ?

Here is the output from 'lspci' for my IDE controler (Toshiba Satellite
2540CDT):

--8<--
00:10.0 IDE interface: Toshiba America Info Systems: Unknown device 0102 (rev 34) (prog-if f0)
        Subsystem: Toshiba America Info Systems: Unknown device 0002
        Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop-ParErr- Stepping- SERR- FastB2B-
        Status: Cap- 66Mhz- UDF- FastB2B- ParErr- DEVSEL=slow >TAbort-<TAbort-<MAbort- >SERR- <PERR-
        Latency: 64 (500ns min, 10000ns max)
        Region 4: I/O ports at 1800 [size=16]
-->8--

and the IDE 7.00beta3-.2.4 messages from /var/log/messages:

--8<--
May 26 12:54:10 satellite kernel: Uniform Multi-Platform E-IDE driver Revision: 7.00beta3-.2.4
May 26 12:54:10 satellite kernel: ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx
May 26 12:54:10 satellite kernel: hda: TOSHIBA MK4309MAT, ATA DISK drive
May 26 12:54:10 satellite kernel: hdc: CD-224E, ATAPI CD/DVD-ROM drive
May 26 12:54:10 satellite kernel: ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
May 26 12:54:10 satellite kernel: ide1 at 0x170-0x177,0x376 on irq 15
May 26 12:54:11 satellite kernel: hda: attached ide-disk driver.
May 26 12:54:11 satellite kernel: hda: host protected area => 1
May 26 12:54:11 satellite kernel: hda: 8452080 sectors (4327 MB), CHS=526/255/63
-->8--

and the IDE 6.31 messages:

--8<--
May 12 11:41:52 satellite kernel: Uniform Multi-Platform E-IDE driver Revision: 6.31
May 12 11:41:52 satellite kernel: ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx
May 12 11:41:52 satellite kernel: PCI_IDE: unknown IDE controller on PCI bus 00 device 80, VID=1179, DID=0102
May 12 11:41:52 satellite kernel: PCI_IDE: chipset revision 52
May 12 11:41:53 satellite kernel: PCI_IDE: not 100%% native mode: will probe irqs later
May 12 11:41:53 satellite kernel:     ide0: BM-DMA at 0x1800-0x1807, BIOS settings: hda:DMA, hdb:pio
May 12 11:41:53 satellite kernel:     ide1: BM-DMA at 0x1808-0x180f, BIOS settings: hdc:pio, hdd:pio
May 12 11:41:53 satellite kernel: hda: TOSHIBA MK4309MAT, ATA DISK drive
May 12 11:41:53 satellite kernel: hdc: CD-224E, ATAPI CD/DVD-ROM drive
May 12 11:41:53 satellite kernel: ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
May 12 11:41:53 satellite kernel: ide1 at 0x170-0x177,0x376 on irq 15
May 12 11:41:53 satellite kernel: blk: queue c03a7604, I/O limit 4095Mb (mask 0xffffffff)
May 12 11:41:53 satellite kernel: hda: 8452080 sectors (4327 MB), CHS=526/255/63, UDMA(33)
May 12 11:41:53 satellite kernel: hdc: ATAPI 24X CD-ROM drive, 128kB Cache, DMA
-->8--

Thanks.

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