Re: [PATCH 0/8] Fix 8xx MMU/TLB.

From: Joakim Tjernlund <joakim.tjernlund@transmode.se>
To: Scott Wood <scottwood@freescale.com>
Cc: Rex Feany <RFeany@mrv.com>,
	"linuxppc-dev@ozlabs.org" <linuxppc-dev@ozlabs.org>
Subject: Re: [PATCH 0/8] Fix 8xx MMU/TLB.
Date: Wed, 14 Oct 2009 20:46:26 +0200	[thread overview]
Message-ID: <OFDE570763.C67580D5-ONC125764F.00663CA8-C125764F.00672117@transmode.se> (raw)
In-Reply-To: <20091014172351.GE21215@loki.buserror.net>

Scott Wood <scottwood@freescale.com> wrote on 14/10/2009 19:23:51:
>
> On Sun, Oct 11, 2009 at 06:35:04PM +0200, Joakim Tjernlund wrote:
> > This is the latest batch of mu 8xx MMU/TLB rework.
> > I think this is complete now and will relax with
> > other work the next few days. I hope I can get some
> > testing from Scott and Rex during this time.
>
> I applied this stack plus "Remove DIRTY pte handling in DTLB Error" (fixing
> up conflicts again, as well as the noted build errors), and got this:

Sorry about the build problems, will fixup.

Don't know what is causing the error though, works just fine on 2.4 :(

Assuming you fixup this error:
 arch/powerpc/kernel/head_8xx.S:577: undefined reference to `DARfix'
with a "b DARFix" I can only guess and I don't have a good guess even :(

You could back out
8xx: start using dcbX instructions in various copy routines
to see if it is the dcbX insn that is causing the error.

>
> INIT: version 2.85 booting
> Mounting /proc and /sys
> Starting the hotplug events dispatcher udevd
> udevd[177]: add_to_rules: unknown key 'MODALIAS' in /etc/udev/rules.d/60-pcmcia.rules:4
> udevd[177]: add_to_rules: unknown key 'MODALIAS' in /etc/udev/rules.d/60-pcmcia.rules:10
> udevd[177]: add_to_rules: unknown key 'MODALIAS' in /etc/udev/rules.d/60-pcmcia.rules:14
> Synthesizing initial hotplug events
> /etc/rc.d/init.d/udev: line 41:   187 Segmentation fault      udevsettle --timeout=300

This looks like the first error?

> Setting the hostname to 8xx
> Running depmod
> WARNING: Couldn't open directory /lib/modules/2.6.31-08384-g2cb4b47-dirty: No
> such file or directory
> FATAL: Could not open /lib/modules/2.6.31-08384-g2cb4b47-dirty/
> modules.dep.tempfor writing: No such file or directory
> Mounting filesystems
> BUG: soft lockup - CPU#0 stuck for 61s! [cat:265]

Perhaps it is looping on the same TLB Error, caused by dcbX insn?

> NIP: c000f160 LR: c000f160 CTR: 00000007
> REGS: c3919c70 TRAP: 0901   Not tainted  (2.6.31-08384-g2cb4b47-dirty)
> MSR: 00009032 <EE,ME,IR,DR>  CR: 88008424  XER: 00000000
> TASK = c3944bd0[265] 'cat' THREAD: c3918000
> GPR00: c000f160 c3919d20 c3944bd0 00000000 100180fc 00000000 00000000 00000001
> GPR08: c393e700 00000000 03ca9d21 00000001 48000428
> NIP [c000f160] do_page_fault+0x188/0x49c
> LR [c000f160] do_page_fault+0x188/0x49c
> Call Trace:
> [c3919d20] [c000f160] do_page_fault+0x188/0x49c (unreliable)
> [c3919dd0] [c000e3f0] handle_page_fault+0xc/0x80
> [c3919e90] [c008910c] seq_read+0x2a4/0x558
> [c3919ee0] [c00ab7c0] proc_reg_read+0x4c/0x70
> [c3919ef0] [c006f47c] vfs_read+0xb4/0x158
> [c3919f10] [c006f78c] sys_read+0x4c/0x90
> [c3919f40] [c000dfc0] ret_from_syscall+0x0/0x38
> Instruction dump:
> 2f990000 419e01f0 801f0014 700a0002 418201f8 7c1900d0 541e0ffe 7fe4fb78
> 7f85e378 7fc6f378 7f63db78 4804c31d <70690003> 7c601b78 40820230 70690004
>
> -Scott
>
>