Re: Lost interrupts with IDE DMA on 2.5.x

From: Bartlomiej Zolnierkiewicz (B.Zolnierkiewicz@elka.pw.edu.pl)
Date: Fri Apr 25 2003 - 14:47:28 EST

Attached patch should help, please try. 

--
Bartlomiej

On Fri, 25 Apr 2003, Marek Habersack wrote:

> Hello,
>
>  I've recently added a second drive to my workstation and since then I'm
> getting the following error from time to time:
>
>   Apr 25 20:42:06 beowulf kernel: hda: dma_timer_expiry: dma status == 0x64
>   Apr 25 20:42:06 beowulf kernel: hda: lost interrupt
>   Apr 25 20:42:06 beowulf kernel: hda: dma_intr: bad DMA status (dma_stat=70)
>   Apr 25 20:42:06 beowulf kernel: hda: dma_intr: status=0x50 { DriveReady
>    SeekComplete }
>
> Both drives are new Maxtors (60 and 40GB) on the VIA KT266 chipset (the mobo
> is MSI K7T266 Pro2-A mobo):
>
> ----------VIA BusMastering IDE Configuration----------------
> Driver Version:                     3.36
> South Bridge:                       VIA vt8233a
> Revision:                           ISA 0x0 IDE 0x6
> Highest DMA rate:                   UDMA133
> BM-DMA base:                        0xfc00
> PCI clock:                          33.3MHz
> Master Read  Cycle IRDY:            0ws
> Master Write Cycle IRDY:            0ws
> 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:              yes                 yes
> Post Write Buffer:            yes                 yes
> Enabled:                      yes                 yes
> Simplex only:                  no                  no
> Cable Type:                   80w                 40w
> -------------------drive0----drive1----drive2----drive3-----
> Transfer Mode:       UDMA      UDMA       PIO       DMA
> Address Setup:      120ns     120ns     120ns     120ns
> Cmd Active:          90ns      90ns      90ns      90ns
> Cmd Recovery:        30ns      30ns      30ns      30ns
> Data Active:         90ns      90ns     330ns      90ns
> Data Recovery:       30ns      30ns     270ns      30ns
> Cycle Time:          15ns      15ns     600ns     120ns
> Transfer Rate:  133.3MB/s 133.3MB/s   3.3MB/s  16.6MB/s
>
>   Of course, when the above happens, all disk I/O freezes. The above happens
> only when there's simultaneous activity on both devices. It doesn't happen
> when the devices are on different IDE interfaces. The transfer is always
> retried and completed successfully, so it's not a bad hdd and I can only
> guess the problem is somewhere in the DMA/IRQ handling by the IDE driver. If
> there's not enough information to diagnose/solve the problem, I can do more
> tests (run with 2.4 for a while, run with the generic IDE drive etc.).
>
> TIA,
>
> marek
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