From: Willy Gardiol <gardiol@libero.it>
Reply-To: gardiol@libero.it
To: linux-kernel@vger.kernel.org, linux-ide@vger.kernel.org
Subject: Bug in IDE controllers when connected to PCI?
Date: Wed, 12 Mar 2003 12:21:06 +0100
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Hi to all,
i think i run into a bug in current stable kernel's regarding IDE controllers 
and PCI.
Sorry for the long post, but i need some help from you to investigate this 
deeper.

I own a CDRW Philips 1610A, here is hdparm -i and -I output:

(hdparm -i)
/dev/hdf:
 Model=PHILIPS CDRW1610A, FwRev=0.010000, SerialNo=5VO2149DL13692
 Config={ Fixed Removeable DTR<=5Mbs DTR>10Mbs nonMagnetic }
 RawCHS=0/0/0, TrkSize=0, SectSize=0, ECCbytes=0
 BuffType=DualPortCache, BuffSize=128kB, MaxMultSect=0
 (maybe): CurCHS=0/0/0, CurSects=0, LBA=yes, LBAsects=0
 IORDY=yes, tPIO={min:120,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

(hdparm -I)
/dev/hdf:
ATAPI CD-ROM, with removable media
        Model Number:           PHILIPS CDRW1610A
        Serial Number:          5VO2149DL13692
        Firmware Revision:      0.010000
Standards:
Configuration:
        DRQ response: 50us.
        Packet size: 12 bytes
Capabilities:
        LBA, IORDY(cannot be disabled)
        Buffer size: 128.0kB
        DMA: sdma0 sdma1 sdma2 mdma0 mdma1 *mdma2 udma0 udma1 udma2
             Cycle time: min=120ns recommended=120ns
        PIO: pio0 pio1 pio2 pio3 pio4
             Cycle time: no flow control=120ns  IORDY flow control=120ns

It works and burns correctly with DMA enabled( hdparm -d1) when connected to 
the on-board IDE controller, following is /rpco/pci of it:
  Bus  0, device   4, function  1:
    IDE interface: VIA Technologies, Inc. VT82C586B PIPC Bus Master IDE (rev 
6).
      Master Capable.  Latency=32.
      I/O at 0xd800 [0xd80f].

I also have two different PCI IDE ATA100/133 controllers:
a Promise Ultra100 TX2 (chip PDC20268)
a Sil  0680 based RAID ATA133 board
Here is /proc/pci for the 0680 (the other one is not conented right now)
  Bus  0, device  11, function  0:
    RAID bus controller: CMD Technology Inc PCI0680 (rev 2).
      IRQ 10.
      Master Capable.  Latency=32.
      I/O at 0x9800 [0x9807].
      I/O at 0x9400 [0x9403].
      I/O at 0x9000 [0x9007].
      I/O at 0x8800 [0x8803].
      I/O at 0x8400 [0x840f].
      Non-prefetchable 32 bit memory at 0xd4800000 [0xd48000ff].

When connected to any of these two controllers (as hde, hdf or hdg, not tryed 
hdh but dont think it changes something) if i enable DMA (hdparm -d1) the 
kernel hangs when i try to burn: no logs are written (!) but i managed to get 
this output (sending all logs to /dev/tty12):

IDE_DMAPROC: chipset supported IDE_DMA_TIMEOUT only: 14
hdf: status timeout: status 0xd0 { Busy }
hdf: drive not ready for command
vmunix: scsi: aborting command due to timeout: pid 934, scsi0, channel 0, id 
0, lun 0 2x2a 00 00 00 00 00 00 1f 00
IDE_DMAPROC: chipset supported IDE_DMA_TIMEOUT only: 14
hdf: status timeout: status 0xd0 { Busy }
hdf: drive not ready for command
hdf: ATAPI reset complete
unable to handle kernel null pointer dereference at virtual address 00018
(follow a register dump, omitted because i didnt copied it)
kernel panic: Aieee, killing interrupt handler!
in interrupt handler - NOT SYNCING

I had to copy this by hand so maybe there are some typo errors.

I also own a DVD reader, also connected to this PCI controllers which uses 
UDMA5 (hdparm -d1 -X69) and has different troubles:
- - with the Promise PCD20268 it causes a kernel panic when i try to read a 
dirty CD (which, on the other hand the cdburner correctly reads)
- - with the 0680 it reads the same CD without giving ANY read errors and 
without hanging the kernel! (but gives many reading errors with the 
burner...)

Off course none of this problems had ever been noticed using the 
motherboard-integrated IDE controllers....

Please note, this troubles appeared first in kernel 2.4.18, and are 
reproducing up to 2.4.20 (i have not tryed 2.4.21-preX nor 2.5.x). There 
where no troubles with any other 2.4.x i tryed (2.4.7, 2.4.14, 2.4.17 at 
least)

What do you think of this? Where could be the problem? what could i do to get 
more info and solve this problem?

Thanks to all!

- -- 

! 
 Willy Gardiol - gardiol@libero.it
 goemon.polito.it/~gardiol
 Use linux for your freedom.

    Non ho parole, fratelli. 
    Quaranta paesi bambini 
    hanno attaccato un asilo 
        e la chiamano guerra.
    Gli eserciti pi? potenti del mondo 
    hanno attaccato il pi? straccione.

	Jack Folla ( 8/10/2001 )	

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