Re: Re: Re: IDE DMA breakage w/ 2.4.21+ and 2.6.0-test4(-mm4)

From: Petr Baudis (pasky_at_ucw.cz)
Date: 08/31/03

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    Date:	Sun, 31 Aug 2003 22:06:39 +0200
To: Bartlomiej Zolnierkiewicz <B.Zolnierkiewicz@elka.pw.edu.pl>, Alan Cox <alan@lxorguk.ukuu.org.uk>, Andre Hedrick <andre@linux-ide.org>, Linux Kernel Mailing List <linux-kernel@vger.kernel.org>

    Dear diary, on Sun, Aug 31, 2003 at 08:57:06PM CEST, I got a letter,
    where Petr Baudis <pasky@ucw.cz> told me, that...
    > Dear diary, on Sun, Aug 31, 2003 at 08:32:47PM CEST, I got a letter,
    > where Bartlomiej Zolnierkiewicz <B.Zolnierkiewicz@elka.pw.edu.pl> told me, that...
    > > On Sunday 31 of August 2003 19:57, Alan Cox wrote:
    > > > On Sul, 2003-08-31 at 17:16, Petr Baudis wrote:
    > > > > Hello,
    > > > >
    > > > > when upgrading from 2.4.20 to 2.4.22, I hit a strange problem - the
    > > > > machine mysteriously freezed (totally, interrupts blocked) in few seconds
    > > > > when I tried to do anything with the soundcard. It turned out to be a DMA
    > > > > conflict between soundcard and disk, since it disappears when I disable
    > > > > the (now defaultly on) DMA-by-default IDE option.
    > > >
    > > > Sound and IDE work together on my MVP3 board. Maybe your hardware is
    > > > just broken.
    > >
    > > Or maybe sound driver is doing some funny things (?).
    >
    > sb: ESS ES1869 Plug and Play AudioDrive detected
    > sb: ISAPnP reports 'ESS ES1869 Plug and Play AudioDrive' at i/o 0x220, irq 10, dma 1, 3
    > SB 3.01 detected OK (220)
    > ESS chip ES1869 detected
    > <ESS ES1869 AudioDrive (rev 11) (3.01)> at 0x220 irq 10 dma 1,3
    > sb: 1 Soundblaster PnP card(s) found.
    >
    > ...worked just fine in the past. Oh and under 2.6.0-test I was using ALSA.

    I did few more experiments, and one strange thing is that /proc/dma does not
    change when turning using_dma on thru hdparm:

     1: SoundBlaster8
     4: cascade

    I'd expect some entry for ide to appear or so. Or is this normal?

    When I'm playing something thru the soundcard and turn using_dma in the middle
    of the playback, it freezes the first time it tries to do any disk i/o, it
    seems.

    In case it matters, here is /proc/ide/via :

    ----------VIA BusMastering IDE Configuration----------------
    Driver Version: 3.37
    South Bridge: VIA vt82c686a
    Revision: ISA 0x1b IDE 0x6
    Highest DMA rate: UDMA66
    BM-DMA base: 0xd000
    PCI clock: 33.3MHz
    Master Read Cycle IRDY: 1ws
    Master Write Cycle IRDY: 1ws
    BM IDE Status Register Read Retry: yes
    Max DRDY Pulse Width: No limit
    -----------------------Primary IDE-------Secondary IDE------
    Read DMA FIFO flush: yes yes
    End Sector FIFO flush: no no
    Prefetch Buffer: no no
    Post Write Buffer: no no
    Enabled: yes yes
    Simplex only: no no
    Cable Type: 40w 40w
    -------------------drive0----drive1----drive2----drive3-----
    Transfer Mode: PIO PIO PIO PIO
    Address Setup: 30ns 120ns 120ns 30ns
    Cmd Active: 90ns 90ns 90ns 90ns
    Cmd Recovery: 30ns 30ns 30ns 30ns
    Data Active: 90ns 330ns 330ns 90ns
    Data Recovery: 30ns 270ns 270ns 30ns
    Cycle Time: 120ns 600ns 600ns 120ns
    Transfer Rate: 16.6MB/s 3.3MB/s 3.3MB/s 16.6MB/s

    Settings are:

    root@machine:~# cat /proc/ide/ide0/hda/settings
    name value min max mode
    ---- ----- --- --- ----
    acoustic 0 0 254 rw
    address 0 0 2 rw
    bios_cyl 79780 0 65535 rw
    bios_head 16 0 255 rw
    bios_sect 63 0 63 rw
    breada_readahead 8 0 255 rw
    bswap 0 0 1 r
    current_speed 66 0 70 rw
    failures 0 0 65535 rw
    file_readahead 124 0 16384 rw
    init_speed 12 0 70 rw
    io_32bit 1 0 3 rw
    keepsettings 0 0 1 rw
    lun 0 0 7 rw
    max_failures 1 0 65535 rw
    max_kb_per_request 128 1 255 rw
    multcount 16 0 16 rw
    nice1 1 0 1 rw
    nowerr 0 0 1 rw
    number 0 0 3 rw
    pio_mode write-only 0 255 w
    slow 0 0 1 rw
    unmaskirq 1 0 1 rw
    using_dma 0 0 1 rw
    wcache 0 0 1 rw

    (before doing hdparm -d 1 /dev/hda)

    (By the way, there are two 'capacity' entries in /proc/ide/ide*/hd*/.)

    I tried to somehow disable the DMA usage in the sound driver or at least
    convince it to use dma 3, but I didn't succeed - if I don't let isapnp do the
    job, sb fails to reset dsp even if i manually insert the identical stuff that
    isapnp autodetected :/ :

    root@machine:~# insmod sb
    Using /lib/modules/2.4.22/kernel/drivers/sound/sb.o
    Soundblaster audio driver Copyright (C) by Hannu Savolainen 1993-1996
    sb: ESS ES1869 Plug and Play AudioDrive detected
    sb: ISAPnP reports 'ESS ES1869 Plug and Play AudioDrive' at i/o 0x220, irq 10, dma 1, 3
    SB 3.01 detected OK (220)
    ESS chip ES1869 detected
    <ESS ES1869 AudioDrive (rev 11) (3.01)> at 0x220 irq 10 dma 1,3
    sb: 1 Soundblaster PnP card(s) found.

    root@machine:~# rmmod sb
    root@machine:~# insmod sb isapnp=0 io=0x220 irq=10 dma=1
    Using /lib/modules/2.4.22/kernel/drivers/sound/sb.o
    Soundblaster audio driver Copyright (C) by Hannu Savolainen 1993-1996
    sb: dsp reset failed.
    /lib/modules/2.4.22/kernel/drivers/sound/sb.o: init_module: No such device
    Hint: insmod errors can be caused by incorrect module parameters, including invalid IO or IRQ parameters

    root@machine:~# insmod sb isapnp=0 io=0x220 irq=10 dma=1,3
    Using /lib/modules/2.4.22/kernel/drivers/sound/sb.o
    /lib/modules/2.4.22/kernel/drivers/sound/sb.o: too many values for dma (max 1)

    Regards, 

    -- 
 
				Petr "Pasky" Baudis
.
Perfection is reached, not when there is no longer anything to add, but when
there is no longer anything to take away.
	-- Antoine de Saint-Exupery
.
Stuff: http://pasky.ji.cz/
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