From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Christian Zigotzky <chzigotzky@xenosoft.de>,
linuxppc-dev@lists.ozlabs.org, darren@stevens-zone.net
Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>,
Michael Ellerman <michaele@au1.ibm.com>
Subject: Re: PAGE_GUARDED
Date: Tue, 24 May 2016 21:16:54 +1000 [thread overview]
Message-ID: <1464088614.3078.79.camel@kernel.crashing.org> (raw)
In-Reply-To: <cff72fd8-3297-b61b-4ddc-8c491b565f80@xenosoft.de>
On Tue, 2016-05-24 at 12:48 +0200, Christian Zigotzky wrote:
> Ben,
>
> Thanks for the hint. I'm sorry I don't know how pgprot_noncached()
> works.
>
> I tried:
>
> 1) range.size, pgprot_noncached()
>
> 2) range.size, pgprot_val(pgprot_noncached(__pgprot(0))));
Hrm... The above is what is used elsewhere, I'm not sure what's wrong.
Aneesh, any idea ?
Michael, does it work on our PA-Semi board ? (DO we have that
southbridge on it ?)
Actually, can you try pgprot_noncached(PAGE_KERNEL) ? If that works,
then I wonder what that's going on in pci_64.c ...
Cheers,
Ben.
> 3) range.size, pgprot_val(pgprot_noncached_wc(__pgprot(0))));
>
> Unfortunately without any success.
>
> I'd like to modify the following code for the ATi SB600 southbridge
> chipset:
>
> /* Workaround for lack of device tree */
> if (primary) {
> __ioremap_at(range.cpu_addr, (void
> *)ISA_IO_BASE,
> range.size,
> _PAGE_NO_CACHE|_PAGE_GUARDED);
> hose->io_base_virt = (void
> *)_IO_BASE;
> printk("Initialised io_base_virt
> 0x%lx
> _IO_BASE 0x%llx\n", (unsigned long)hose->io_base_virt, (unsigned
> long
> long)_IO_BASE);
> }
>
> This workaround works with the kernel 4.6 final. After the commit
> powerpc-4.7-1, the computer doesn't boot anymore.
>
> Last message in the CFE firmware:
>
> Booting Linux via __start()...
>
> Cheers,
>
> Christian
>
>
> On 23 May 2016 at 10:01 AM, Benjamin Herrenschmidt wrote:
> >
> > On Mon, 2016-05-23 at 06:38 +0200, Christian Zigotzky wrote:
> > >
> > > Hi All,
> > >
> > > You removed PAGE_GUARDED in the commit
> > >
> > > https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/c
> > > ommi
> > > t/?id=c04a5880299eab3da8c10547db96ea9cdffd44a6
> > >
> > > We use
> > >
> > > range.size, _PAGE_NO_CACHE|_PAGE_GUARDED);
> > >
> > > This doesn't work anymore. What can we use instead?
> > You should just use pgprot_noncached()
> >
> > Cheers,
> > Ben.
> >
> >
next prev parent reply other threads:[~2016-05-24 11:17 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-05-23 4:38 PAGE_GUARDED Christian Zigotzky
2016-05-23 8:01 ` PAGE_GUARDED Benjamin Herrenschmidt
2016-05-24 10:48 ` PAGE_GUARDED Christian Zigotzky
2016-05-24 11:16 ` Benjamin Herrenschmidt [this message]
2016-05-24 13:37 ` PAGE_GUARDED Christian Zigotzky
2016-05-24 15:37 ` PAGE_GUARDED Aneesh Kumar K.V
2016-05-25 6:58 ` PAGE_GUARDED Christian Zigotzky
2016-05-25 11:44 ` PAGE_GUARDED Christian Zigotzky
2016-06-04 7:19 ` Kernel 4.7: PAGE_GUARDED and _PAGE_NO_CACHE Christian Zigotzky
2016-06-04 7:40 ` Christian Zigotzky
2016-06-04 11:08 ` Christian Zigotzky
2016-06-04 14:46 ` Aneesh Kumar K.V
2016-06-04 15:13 ` Christian Zigotzky
2016-06-04 15:25 ` Christian Zigotzky
2016-06-05 16:09 ` Christian Zigotzky
2016-06-06 0:57 ` Michael Ellerman
2016-06-06 1:23 ` Julian Margetson
2016-06-06 2:00 ` Michael Ellerman
2016-06-06 8:59 ` Julian Margetson
2016-06-06 0:54 ` Michael Ellerman
2016-06-04 14:42 ` Aneesh Kumar K.V
2016-06-04 15:07 ` Christian Zigotzky
2016-06-06 0:51 ` Michael Ellerman
2016-06-06 5:21 ` Christian Zigotzky
2016-06-07 20:17 ` Christian Zigotzky
2016-06-07 22:14 ` Christian Zigotzky
2016-06-08 1:51 ` Michael Ellerman
2016-06-08 2:52 ` Michael Ellerman
2016-06-08 10:58 ` Christian Zigotzky
2016-06-08 11:30 ` Michael Ellerman
2016-06-08 12:50 ` Christian Zigotzky
2016-06-08 11:33 ` Darren Stevens
2016-06-08 13:24 ` Christian Zigotzky
2016-06-08 13:51 ` Christian Zigotzky
2016-06-08 13:52 ` Michael Ellerman
2016-06-08 15:11 ` Aneesh Kumar K.V
2016-06-08 15:47 ` Christian Zigotzky
2016-06-09 8:48 ` Christian Zigotzky
2016-06-09 11:15 ` Michael Ellerman
2016-06-09 13:13 ` Christian Zigotzky
2016-06-13 8:14 ` Christian Zigotzky
2016-06-13 8:19 ` Benjamin Herrenschmidt
2016-06-13 18:09 ` Christian Zigotzky
2016-06-22 19:07 ` Christian Zigotzky
2016-06-22 19:58 ` luigi burdo
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1464088614.3078.79.camel@kernel.crashing.org \
--to=benh@kernel.crashing.org \
--cc=aneesh.kumar@linux.vnet.ibm.com \
--cc=chzigotzky@xenosoft.de \
--cc=darren@stevens-zone.net \
--cc=linuxppc-dev@lists.ozlabs.org \
--cc=michaele@au1.ibm.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.