2003-11-06 06:27:07

by Jason Papadopoulos

Subject: Alpha: ALi 15x3 DMA completely broken now

Hello. 2.4.21-rc could not start DMA at boot time on
my system, but hdparm could turn it on afterwards. Now
with 2.4.22, nothing will turn on DMA; using hdparm
locks the machine immediately.

The machine in question is an DS10 Alphaserver, Ali
M5229 rev c0 IDE controller. Has 2.4.23-pre made any
fixes for this device?

Thanks in advance,
jasonp

2003-11-06 06:58:11

by Al Viro

Subject: Re: Alpha: ALi 15x3 DMA completely broken now

On Thu, Nov 06, 2003 at 01:34:35AM -0500, Jason Papadopoulos wrote:
>
> Hello. 2.4.21-rc could not start DMA at boot time on
> my system, but hdparm could turn it on afterwards. Now
> with 2.4.22, nothing will turn on DMA; using hdparm
> locks the machine immediately.
>
> The machine in question is an DS10 Alphaserver, Ali
> M5229 rev c0 IDE controller. Has 2.4.23-pre made any
> fixes for this device?

Yes - setup_irq() fix in 2.4.23-pre8 (arch/alpha/kernel/irq.c) had
fixed IDE hangs on DS10 (verified for 5229 rev c1). If that doesn't
help, try to narrow it down - try 2.4.21-* + irq.c change and see
where does it stop working.

It should be able to do DMA at boot time, BTW:

wynton:~# dmesg |head -2
Linux version 2.4.23-pre8 (al@wynton) (gcc version 3.3.2 20031005 (Debian prerelease)) #1 SMP Fri Oct 24 04:27:45 EDT 2003
Booting GENERIC on Tsunami variation Webbrick using machine vector Webbrick from SRM
wynton:~# lspci |grep M5229
00:0d.0 IDE interface: ALi Corporation M5229 IDE (rev c1)
wynton:~# hdparm -i /dev/hdc|grep modes
PIO modes: pio0 pio1 pio2 pio3 pio4
DMA modes: mdma0 mdma1 mdma2
UDMA modes: udma0 udma1 *udma2 udma3 udma4
wynton:~# hdparm -i /dev/hda|grep modes
PIO modes: pio0 pio1 pio2 pio3 pio4
DMA modes: sdma0 sdma1 sdma2 mdma0 mdma1 *mdma2

DS10 with cdrom on hda and disk on hdc, no ide-related arguments in command
line. Revision c0 won't do UDMA, but it should be able to do DMA just fine...

What configuration do you have?

2003-11-07 22:09:36

by Jason Papadopoulos

Subject: Re: Alpha: ALi 15x3 DMA completely broken now

At 06:58 AM 11/6/03 +0000, [email protected] wrote:

>Yes - setup_irq() fix in 2.4.23-pre8 (arch/alpha/kernel/irq.c) had
>fixed IDE hangs on DS10 (verified for 5229 rev c1). If that doesn't
>help, try to narrow it down - try 2.4.21-* + irq.c change and see
>where does it stop working.
>
>It should be able to do DMA at boot time, BTW:

I actually have a rev c1 controller.

And it works now, with DMA turned on at boot time. Attempting to
turn on UDMA with hdparm, even with irq.c patched, still causes
an immediate hang.

I don't care though. Thanks a million.

jasonp