linux-kernel - Re: n900 in next-20170901

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Date:   Tue, 14 Nov 2017 15:40:37 +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 Mon, Nov 13, 2017 at 01:15:30PM -0800, Tony Lindgren wrote:
> * Tony Lindgren <tony@...mide.com> [171110 07:36]:
> > * Joonsoo Kim <iamjoonsoo.kim@....com> [171110 06:34]:
> > > On Thu, Nov 09, 2017 at 07:26:10PM -0800, Tony Lindgren wrote:
> > > > +#define OMAP34XX_SRAM_PHYS	0x40200000
> > > > +#define OMAP34XX_SRAM_VIRT	0xd0010000
> > > > +#define OMAP34XX_SRAM_SIZE	0x10000
> > > 
> > > For my testing environment, vmalloc address space is started at
> > > roughly 0xe0000000 so 0xd0010000 would not be valid.
> > 
> > Well we can map it anywhere we want, got any preferences?
> 
> Hmm and I'm also wondering what you do to make vmalloc space to
> start at 0xe0000000 instead of 0xd0000000?

Please see the another reply.

> 
> The reason I'm asking is because I think we can just move all of
> save_secure_ram_context to run from DDR instead of SRAM. But I'd
> rather do a minimal patch first that fixes your series and then we
> can test the further changes with more time.

Okay. I agree to make a minimal patch first and then go next step.

> After moving save_secure_ram_context to DDR, we can call
> save_secure_ram_context directly with something like:
> 
> 	args_pa = __pa(omap3_secure_ram_storage);
> 	offset = (unsigned long)omap3_secure_ram_storage - args_pa;
> 	ret = save_secure_ram_context(args_pa, offset);
> 
> > Just that the current save_secure_ram_context uses "high_mask"
> > of 0xffff to translate the address. To make this more flexible,
> > we need the save_secure_ram_context changes too. So we might
> > want to do the static mapping and save_secure_ram_context changes
> > as a single patch.
> > 
> > > And, PHYS can be different according to the system type. Maybe either
> > > OMAP3_SRAM_PUB_PA or OMAP3_SRAM_PA. It seems that SIZE and TYPE should
> > > be considered, too. My understanding is correct?
> > 
> > We can have a static map for the whole SRAM area, see function
> > __arm_ioremap_pfn_caller() for the comment "Try to reuse one of the
> > static mapping whenever possible". So the different public SRAM start
> > addresses and sizes don't matter there.
> 
> And then if save_secure_ram_contet runs in DDR, no static map is
> needed.

Okay.

Thanks.