linux-kernel - Re: [PATCH v2 0/5] crypto: ccree: cleanup, fixes and R-Car enabling

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Date:   Wed, 20 Jun 2018 10:51:46 +0200
From:   Simon Horman <horms@...ge.net.au>
To:     Gilad Ben-Yossef <gilad@...yossef.com>
Cc:     Geert Uytterhoeven <geert@...ux-m68k.org>,
        Magnus Damm <magnus.damm@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        Linux Crypto Mailing List <linux-crypto@...r.kernel.org>,
        linux-clk <linux-clk@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Ofir Drang <ofir.drang@....com>
Subject: Re: [PATCH v2 0/5] crypto: ccree: cleanup, fixes and R-Car enabling

On Tue, Jun 19, 2018 at 04:57:15PM +0300, Gilad Ben-Yossef wrote:
> On Tue, Jun 19, 2018 at 3:58 PM, Geert Uytterhoeven
> <geert@...ux-m68k.org> wrote:
> > Hi Gilad,
> >
> > On Thu, May 24, 2018 at 4:19 PM Gilad Ben-Yossef <gilad@...yossef.com> wrote:
> >> The patch set enables the use of CryptoCell found in some Renesas R-Car
> >> Salvator-X boards and fixes some driver issues uncovered that prevented
> >> to work properly.
> >
> > With DEBUG enabled on R-Car H3, I see lots of
> >
> >     ccree e6601000.crypto: IRR includes unknown cause bits (0x00000098)
> >     ccree e6601000.crypto: IRR includes unknown cause bits (0x000000C0)
> >     ccree e6601000.crypto: IRR includes unknown cause bits (0x000000D0)
> >     ccree e6601000.crypto: IRR includes unknown cause bits (0x000000D8)
> >     ccree e6601000.crypto: IRR includes unknown cause bits (0x000000E0)
> >     ccree e6601000.crypto: IRR includes unknown cause bits (0x000000F0)
> >     ccree e6601000.crypto: IRR includes unknown cause bits (0x000000F8)
> >
> > during boot. Is that expected?
> 
> Yes. The condition itself it is reporting is not necessarily bad. It
> means that driver
> did not act on certain HW notification during interrupts and that's
> OK, we don't act on all of them
> depending on configuration - e.g. if you have CONFIG_FIPS enabled and
> an active TEE module or not.
> 
> I can rate_limit the message if it bothers you but other than that it
> is a harmless debug print.

Rate limiting sounds like an excellent idea to me.