linux-kernel - Re: n900 in next-20170901

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Message-ID: <20171020015542.GA10438@js1304-P5Q-DELUXE>
Date:   Fri, 20 Oct 2017 10:55:42 +0900
From:   Joonsoo Kim <iamjoonsoo.kim@....com>
To:     Tony Lindgren <tony@...mide.com>
Cc:     Pavel Machek <pavel@....cz>, pali.rohar@...il.com, sre@...nel.org,
        kernel list <linux-kernel@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-omap@...r.kernel.org, khilman@...nel.org,
        aaro.koskinen@....fi, ivo.g.dimitrov.75@...il.com,
        patrikbachan@...il.com, serge@...lyn.com, abcloriens@...il.com,
        "Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        Russell King <linux@...linux.org.uk>
Subject: Re: n900 in next-20170901

On Thu, Oct 19, 2017 at 11:30:34AM -0700, Tony Lindgren wrote:
> * Joonsoo Kim <iamjoonsoo.kim@....com> [171018 01:27]:
> > On Mon, Sep 25, 2017 at 07:54:37AM -0700, Tony Lindgren wrote:
> > > * Joonsoo Kim <iamjoonsoo.kim@....com> [170925 01:06]:
> > > > On Thu, Sep 21, 2017 at 10:28:11AM -0700, Tony Lindgren wrote:
> > > > > * Joonsoo Kim <iamjoonsoo.kim@....com> [170914 23:55]:
> > > > > > On Wed, Sep 13, 2017 at 09:31:27AM -0700, Tony Lindgren wrote:
> > > > > > > Yes I disabled CONFIG_HIGHMEM and n900 boots. To disable it,
> > > > > > > you need to remove it from arch/arm/mach-omap2/Kconfig that
> > > > > > > selects it if ARCH_OMAP2PLUS_TYPICAL is selected.
> > > > > > 
> > > > > > Okay. Problem would be related to address traslation. I'd like to
> > > > > > check address traslation more. Could you apply following patch and
> > > > > > test it? And, please send me the dmesg log and your kernel config.
> > > > > > Please test this with CONFIG_DEBUG_VIRTUAL = n and CONFIG_CMA_DEBUG=y and
> > > > > > CONFIG_HIGHMEM=y and with kernel bootparam 'ignore_loglevel'.
> > > > > > 
> > > > > > It would be really appreciate if you send me two logs for before/after
> > > > > > commit 9caf25f996e8.
> > > > > 
> > > > > Sorry for the delays, I finally got around testing this for you.
> > > > 
> > > > No problem! I really appreciate your help!
> > > > 
> > > > > Compile with your patch failed for modules with __virt_to_phys_debug
> > > > > being undefined so I added EXPORT_SYMBOL there. I also enabled DEBUG_LL
> > > > > and EARLYPRINTK to get output.
> > > > > 
> > > > > Below is dmesg output for 9caf25f996e8 + your patch. I'll send you
> > > > > the full logs separately.
> > > > 
> > > > Hmm...there is only one caller for the CMA memory, that is, atomic_pool_init().
> > > > Could you test one more time with 9caf25f996e8 + following patch?  I'd like to
> > > > know the actual user for the CMA memory.
> > > 
> > > Hmm not getting any stack with that patch after manually applying
> > > it because of tabs to spaces mangling.
> > 
> > Sorry for long delay.
> > 
> > Seems like your system doesn't use any CMA memory by CMA API.
> > 
> > Could you test one more thing?
> > This one is to disable CMA memory allocation from the page allocator.
> > With this, we can be sure that CMA memory isn't used at all.
> > 
> > If there is no difference with this patch, that is, the system down,
> > I think that some initialization step is broken. In this case, please
> > test following patch.
> > 
> > I make a branch in github that all these patch is applied.
> > Feel free to use it.
> > 
> > https://github.com/JoonsooKim/linux/tree/cma-debug4-next-20180901
> 
> Still not booting, dmesg output of your test branch below.

Oops... I made a mistak. Could you test with reverting commit
c977ee2803787363187d6aca9cebdabc793c6531 ("omap: forcibly call
save_secure_ram_context() for test") in that branch?
Without reverting it, it doesn't call 'smc' so it always cause a
hang.

Thanks.