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Date: Wed, 5 Feb 2003 10:48:45 +0100
From: Stephan von Krawczynski <skraw@ithnet.com>
To: Jeff Garzik <jgarzik@pobox.com>
Cc: linux-kernel@vger.kernel.org, davem@redhat.com
Subject: Re: 2.4.21-pre4: PDC ide driver problems with shared interrupts
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On Sun, 02 Feb 2003 13:28:55 -0500
Jeff Garzik <jgarzik@pobox.com> wrote:

> > To make sure I will let it stress-test overnight and send you the results in
> > about 15 hours from now on. If everything does fine I will redo with ide2,ide3
> > on same interrupt, too. Just to see what happens with these Promise things...
> 
> 
> great.
> 
> though who knows with the Promise stuff... :)  I hope it's not their 
> binary-only junk...
> 
> 	Jeff

Okay, I had to watch for it a bit longer and it turns out that the kernel PDC driver has a problem in this shared interrupt setup. When loads get high it seems to run into some timing problem which causes things like:

Feb  4 01:02:22 admin kernel: hde: dma_intr: status=0xd0 { Busy }
Feb  4 01:02:22 admin kernel: 
Feb  4 01:02:22 admin kernel: PDC202XX: Primary channel reset.
Feb  4 01:02:22 admin kernel: ide2: reset: success
Feb  4 01:02:23 admin kernel: hde: status error: status=0x58 { DriveReady SeekComplete DataRequest }
Feb  4 01:02:23 admin kernel: 
Feb  4 01:02:23 admin kernel: hde: drive not ready for command
Feb  4 01:02:23 admin kernel: hde: status error: status=0x50 { DriveReady SeekComplete }
Feb  4 01:02:23 admin kernel: 
Feb  4 01:02:23 admin kernel: hde: no DRQ after issuing WRITE
Feb  4 01:02:23 admin kernel: hde: status timeout: status=0xd0 { Busy }
Feb  4 01:02:23 admin kernel: 

Results are that the drive itself just hangs and has to be powered off (resetting the box does not work). The drives worked (and works) fine in non shared-interrupt context. Controller is:

<6>PDC20268: IDE controller at PCI slot 01:02.0
<6>PCI: Found IRQ 11 for device 01:02.0
<6>PDC20268: chipset revision 1
<6>PDC20268: not 100%% native mode: will probe irqs later
<6>    ide2: BM-DMA at 0x7400-0x7407, BIOS settings: hde:pio, hdf:pio
<6>    ide3: BM-DMA at 0x7408-0x740f, BIOS settings: hdg:pio, hdh:pio
<4>hdc: AOPEN CD-RW CRW2440, ATAPI CD/DVD-ROM drive
<4>hde: ST380021A, ATA DISK drive
<4>blk: queue c034e1f8, I/O limit 4095Mb (mask 0xffffffff)
<4>hdg: IC35L060AVER07-0, ATA DISK drive
<4>blk: queue c034e664, I/O limit 4095Mb (mask 0xffffffff)
<4>ide1 at 0x170-0x177,0x376 on irq 15
<4>ide2 at 0x8800-0x8807,0x8402 on irq 11
<4>ide3 at 0x8000-0x8007,0x7802 on irq 11
<4>hde: host protected area => 1
<6>hde: 156301488 sectors (80026 MB) w/2048KiB Cache, CHS=155061/16/63, UDMA(100)
<4>hdg: host protected area => 1
<6>hdg: 120103200 sectors (61493 MB) w/1916KiB Cache, CHS=119150/16/63, UDMA(100)
<6>Partition check:
<6> hde: hde1
<6> hdg:<6> [PTBL] [7476/255/63] hdg1

Regards,
Stephan

PS: tg3 does great! Good job, Jeff...