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SubjectUnable to re-enable DMA after DMA timeout (why?)
Date
Here is what happens after several days running with either the kernel
activating DMA or activating it manually (hdparm -d1 /dev/hda) in at
least
2.4.2 through 2.4.5-ac5:

hda: timeout waiting for DMA
ide_dmaproc: chipset supported ide_dma_timeout func only: 14
hda: irq timeout: status=0x80 { Busy }
hda: DMA disabled
ide0: reset: success

Issuing hdparm -d1 /dev/hda at this point causes a short period of
system unresponsiveness which ends with the following:

hda: timeout waiting for DMA
ide_dmaproc: chipset supported ide_dma_timeout func only: 14
hda: irq timeout: status=0x50 { DriveReady SeekComplete }
hda: timeout waiting for DMA
ide_dmaproc: chipset supported ide_dma_timeout func only: 14
hda: irq timeout: status=0x50 { DriveReady SeekComplete }
hda: timeout waiting for DMA
ide_dmaproc: chipset supported ide_dma_timeout func only: 14
hda: irq timeout: status=0x50 { DriveReady SeekComplete }
hda: timeout waiting for DMA
ide_dmaproc: chipset supported ide_dma_timeout func only: 14
hda: irq timeout: status=0x50 { DriveReady SeekComplete }
hda: DMA disabled
ide0: reset: success

Here is the drive info:

hdparm -iI /dev/hda

/dev/hda:

Model=IBM-DTTA-371010, FwRev=T77OA73A, SerialNo=WL0WLF36394
Config={ HardSect NotMFM HdSw>15uSec Fixed DTR>10Mbs }
RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=34
BuffType=DualPortCache, BuffSize=465kB, MaxMultSect=16, MultSect=off
CurCHS=16383/16/63, CurSects=-66060037, LBA=yes, LBAsects=19746720
IORDY=on/off, tPIO={min:240,w/IORDY:120}, tDMA={min:120,rec:120}
PIO modes: pio0 pio1 pio2 pio3 pio4
DMA modes: sdma0 sdma1 sdma2 mdma0 mdma1 mdma2 udma0 udma1 *udma2
AdvancedPM=no
Drive Supports : ATA/ATAPI-4 T13 1153D revision 17 : ATA-1 ATA-2 ATA-3
ATA-4


Model=BI-MTDAT3-1710 0 , FwRev=7TO77AA3,
SerialNo=
W 0LLW3F3649
Config={ HardSect NotMFM HdSw>15uSec Fixed DTR>10Mbs }
RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=34
BuffType=DualPortCache, BuffSize=465kB, MaxMultSect=16, MultSect=off
CurCHS=16383/16/63, CurSects=-66060037, LBA=yes, LBAsects=19746720
IORDY=on/off, tPIO={min:240,w/IORDY:120}, tDMA={min:120,rec:120}
PIO modes: pio0 pio1 pio2 pio3 pio4
DMA modes: sdma0 sdma1 sdma2 mdma0 mdma1 *mdma2 udma0 udma1 udma2
AdvancedPM=no
Drive Supports : ATA/ATAPI-4 T13 1153D revision 17 : ATA-1 ATA-2 ATA-3
ATA-4

Here is the controller info:

00:11.0 Unknown mass storage controller: Promise Technology, Inc. 20262
(rev 01)
Subsystem: Promise Technology, Inc.: Unknown device 4d33
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop-
ParErr- Stepping- SERR- FastB2B-
Status: Cap+ 66Mhz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort-
<TAbort- <MAbort- >SERR- <PERR-
Latency: 64
Interrupt: pin A routed to IRQ 11
Region 0: I/O ports at f4f0 [size=8]
Region 1: I/O ports at fc88 [size=4]
Region 2: I/O ports at f4f8 [size=8]
Region 3: I/O ports at fc8c [size=4]
Region 4: I/O ports at fcc0 [size=64]
Region 5: Memory at fcfe0000 (32-bit, non-prefetchable)
[size=128K]
Expansion ROM at <unassigned> [disabled] [size=64K]
Capabilities: [58] Power Management version 1
Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA
PME(D0-,D1-,D2-,D3hot-,D3cold-)
Status: D0 PME-Enable- DSel=0 DScale=0 PME-

I also see this on the onboard controller

00:00.0 Host bridge: Intel Corporation 430VX - 82437VX TVX [Triton VX]
(rev 02)
Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop-
ParErr- Stepping- SERR- FastB2B-
Status: Cap- 66Mhz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort-
<TAbort- <MAbort+ >SERR- <PERR-
Latency: 32

00:07.1 IDE interface: Intel Corporation 82371SB PIIX3 IDE
[Natoma/Triton II] (prog-if 80 [Master])
Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop-
ParErr- Stepping- SERR- FastB2B-
Status: Cap- 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort-
<TAbort- <MAbort- >SERR- <PERR-
Latency: 64
Region 4: I/O ports at fc90 [size=16]

I distinctly remember being able to re-enable DMA after the DMA timeout
in 2.2.x. What gives?



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