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From: Joakim Tjernlund <joakim.tjernlund@transmode.se>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Scott Wood <scottwood@freescale.com>,
	"linuxppc-dev@ozlabs.org" <linuxppc-dev@ozlabs.org>,
	Rex Feany <RFeany@mrv.com>
Subject: Re: [PATCH 3/6] 8xx: get rid of _PAGE_HWWRITE dependency in MMU.
Date: Tue, 6 Oct 2009 17:40:35 +0200	[thread overview]
Message-ID: <OF8881FD0B.21715064-ONC1257647.005485CA-C1257647.00561D2D@transmode.se> (raw)
In-Reply-To: <1254811547.6035.3.camel@pasglop>

Benjamin Herrenschmidt <benh@kernel.crashing.org> wrote on 06/10/2009 08:45:47:
>
> On Tue, 2009-10-06 at 08:15 +0200, Joakim Tjernlund wrote:
>
> > Yes, I would too but TLB Miss knows nothing about load/store, protection etc.
> > because DSISR isn't set. So I cannot see any other way than the TLB Error way.
>
> Hrm... that MMU really sucks more than I thought :-(
>
> I'll go read the manual and think about that a bit more.

I realise now that for an ITLB Miss I can work out everything I need.
an ITLB must be a read en everything else is in the linux pte.
Just check present and user, add accessed if not already there.
I blame that on too little sleep :)

I don't think I will dwell on that ATM.

    Jocke

  parent reply	other threads:[~2009-10-06 15:42 UTC|newest]

Thread overview: 49+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-10-05 12:16 [PATCH 0/6] PowerPc 8xx TLB/MMU fixes Joakim Tjernlund
2009-10-05 12:16 ` [PATCH 1/6] 8xx: DTLB Error must check for more errors Joakim Tjernlund
2009-10-05 12:16   ` [PATCH 2/6] 8xx, fault: Add some debug code to do_page_fault() Joakim Tjernlund
2009-10-05 12:16     ` [PATCH 3/6] 8xx: get rid of _PAGE_HWWRITE dependency in MMU Joakim Tjernlund
2009-10-05 12:16       ` [PATCH 4/6] 8xx: Tag DAR with 0x00f0 to catch buggy instructions Joakim Tjernlund
2009-10-05 12:16         ` [PATCH 5/6] 8xx: Fixup DAR from buggy dcbX instructions Joakim Tjernlund
2009-10-05 12:16           ` [PATCH 6/6] 8xx: start using dcbX instructions in various copy routines Joakim Tjernlund
2009-10-05 20:17       ` [PATCH 3/6] 8xx: get rid of _PAGE_HWWRITE dependency in MMU Benjamin Herrenschmidt
2009-10-05 21:25         ` Joakim Tjernlund
2009-10-05 21:37           ` Benjamin Herrenschmidt
2009-10-05 22:00             ` Joakim Tjernlund
2009-10-05 22:09               ` Benjamin Herrenschmidt
2009-10-05 22:55                 ` Joakim Tjernlund
2009-10-05 23:15                   ` Benjamin Herrenschmidt
2009-10-05 23:35                     ` Joakim Tjernlund
2009-10-06  0:34                       ` Benjamin Herrenschmidt
2009-10-06  6:15                         ` Joakim Tjernlund
2009-10-06  6:45                           ` Benjamin Herrenschmidt
2009-10-06  7:54                             ` Joakim Tjernlund
2009-10-06 15:40                             ` Joakim Tjernlund [this message]
2009-10-06 17:28                               ` Joakim Tjernlund
2009-10-06 22:05                         ` Joakim Tjernlund
2009-10-06 23:25                           ` Benjamin Herrenschmidt
2009-10-07  1:07                           ` Benjamin Herrenschmidt
2009-10-07  7:47                             ` Joakim Tjernlund
2009-10-05 18:12 ` [PATCH 0/6] PowerPc 8xx TLB/MMU fixes Scott Wood
2009-10-05 18:27   ` Joakim Tjernlund
2009-10-05 20:09     ` Scott Wood
2009-10-05 21:04       ` Joakim Tjernlund
2009-10-05 21:31         ` Benjamin Herrenschmidt
2009-10-05 21:41           ` Joakim Tjernlund
2009-10-05 21:46             ` Scott Wood
2009-10-05 21:31         ` Scott Wood
2009-10-05 22:04 ` Rex Feany
2009-10-05 22:31   ` Joakim Tjernlund
2009-10-05 22:37     ` Benjamin Herrenschmidt
2009-10-05 22:58       ` Joakim Tjernlund
2009-10-05 23:49       ` Joakim Tjernlund
2009-10-06  1:52         ` Benjamin Herrenschmidt
2009-10-06  8:06           ` Joakim Tjernlund
2009-10-06  8:32             ` Benjamin Herrenschmidt
2009-10-06 10:58               ` Joakim Tjernlund
2009-10-06 11:06                 ` Benjamin Herrenschmidt
2009-10-06 11:39                   ` Joakim Tjernlund
2009-10-06 13:18                   ` Joakim Tjernlund
2009-10-05 22:42     ` Rex Feany
2009-10-05 23:00       ` Joakim Tjernlund
2009-10-06  6:25       ` Joakim Tjernlund
2009-10-06  6:44         ` Benjamin Herrenschmidt

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