linux-kernel - Re: [PATCH v4] mtd: parsers: bcm63xx: simplify CFE detection

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Message-ID: <CA+G9fYvGkowdQmi1eBfoq2dhzBfgkFh9+7tgdNw75LydxkAEPw@mail.gmail.com>
Date:   Tue, 22 Sep 2020 08:48:35 +0530
From:   Naresh Kamboju <naresh.kamboju@...aro.org>
To:     Álvaro Fernández Rojas <noltari@...il.com>,
        linux-mips@...r.kernel.org
Cc:     tsbogend@...ha.franken.de, Florian Fainelli <f.fainelli@...il.com>,
        bcm-kernel-feedback-list@...adcom.com,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>, jonas.gorski@...il.com,
        Linus Walleij <linus.walleij@...aro.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        open list <linux-kernel@...r.kernel.org>,
        linux-mtd@...ts.infradead.org, lkft-triage@...ts.linaro.org,
        Guenter Roeck <linux@...ck-us.net>
Subject: Re: [PATCH v4] mtd: parsers: bcm63xx: simplify CFE detection

On Fri, 14 Aug 2020 at 14:26, Guenter Roeck <linux@...ck-us.net> wrote:
>
> On Mon, Jun 15, 2020 at 11:17:40AM +0200, Álvaro Fernández Rojas wrote:
> > Instead of trying to parse CFE version string, which is customized by some
> > vendors, let's just check that "CFE1" was passed on argument 3.
> >
> > Signed-off-by: Álvaro Fernández Rojas <noltari@...il.com>
> > Signed-off-by: Jonas Gorski <jonas.gorski@...il.com>
> > Reviewed-by: Florian Fainelli <f.fainelli@...il.com>
>

We still see mips: allmodconfig build failure on Linus tree

make -sk KBUILD_BUILD_USER=TuxBuild -C/linux ARCH=mips
CROSS_COMPILE=mips-linux-gnu- HOSTCC=gcc CC="sccache
mips-linux-gnu-gcc" O=build allmodconfig

make -sk KBUILD_BUILD_USER=TuxBuild -C/linux -j16 ARCH=mips
CROSS_COMPILE=mips-linux-gnu- HOSTCC=gcc CC="sccache
mips-linux-gnu-gcc" O=build


> mips:allmodconfig:
>
> ERROR: modpost: "fw_arg3" [drivers/mtd/parsers/bcm63xxpart.ko] undefined!

ERROR: modpost: "fw_arg3" [drivers/mtd/parsers/bcm63xxpart.ko] undefined!

Reported-by: Naresh Kamboju <naresh.kamboju@...aro.org>

Full build link,
https://builds.tuxbuild.com/Sm59_9tjFMpIvT27qf5kNA/build.log

>
> This is not surprising, since fw_arg3 is not exported.
>
> Guenter
>
> > ---
> >  v4: shorten conditional compilation part as suggested by Miquèl.
> >  v3: keep COMPILE_TEST compatibility by adding a new function that only checks
> >      fw_arg3 when CONFIG_MIPS is defined.
> >  v2: use CFE_EPTSEAL definition and avoid using an additional function.
> >
> >  drivers/mtd/parsers/bcm63xxpart.c | 32 ++++++++++++-------------------
> >  1 file changed, 12 insertions(+), 20 deletions(-)
> >
> > diff --git a/drivers/mtd/parsers/bcm63xxpart.c b/drivers/mtd/parsers/bcm63xxpart.c
> > index 78f90c6c18fd..b15bdadaedb5 100644
> > --- a/drivers/mtd/parsers/bcm63xxpart.c
> > +++ b/drivers/mtd/parsers/bcm63xxpart.c
> > @@ -22,6 +22,11 @@
> >  #include <linux/mtd/partitions.h>
> >  #include <linux/of.h>
> >
> > +#ifdef CONFIG_MIPS
> > +#include <asm/bootinfo.h>
> > +#include <asm/fw/cfe/cfe_api.h>
> > +#endif /* CONFIG_MIPS */
> > +
> >  #define BCM963XX_CFE_BLOCK_SIZE              SZ_64K  /* always at least 64KiB */
> >
> >  #define BCM963XX_CFE_MAGIC_OFFSET    0x4e0
> > @@ -32,28 +37,15 @@
> >  #define STR_NULL_TERMINATE(x) \
> >       do { char *_str = (x); _str[sizeof(x) - 1] = 0; } while (0)
> >
> > -static int bcm63xx_detect_cfe(struct mtd_info *master)
> > +static inline int bcm63xx_detect_cfe(void)
> >  {
> > -     char buf[9];
> > -     int ret;
> > -     size_t retlen;
> > +     int ret = 0;
> >
> > -     ret = mtd_read(master, BCM963XX_CFE_VERSION_OFFSET, 5, &retlen,
> > -                    (void *)buf);
> > -     buf[retlen] = 0;
> > +#ifdef CONFIG_MIPS
> > +     ret = (fw_arg3 == CFE_EPTSEAL);
> > +#endif /* CONFIG_MIPS */
> >
> > -     if (ret)
> > -             return ret;
> > -
> > -     if (strncmp("cfe-v", buf, 5) == 0)
> > -             return 0;
> > -
> > -     /* very old CFE's do not have the cfe-v string, so check for magic */
> > -     ret = mtd_read(master, BCM963XX_CFE_MAGIC_OFFSET, 8, &retlen,
> > -                    (void *)buf);
> > -     buf[retlen] = 0;
> > -
> > -     return strncmp("CFE1CFE1", buf, 8);
> > +     return ret;
> >  }
> >
> >  static int bcm63xx_read_nvram(struct mtd_info *master,
> > @@ -138,7 +130,7 @@ static int bcm63xx_parse_cfe_partitions(struct mtd_info *master,
> >       struct bcm963xx_nvram *nvram = NULL;
> >       int ret;
> >
> > -     if (bcm63xx_detect_cfe(master))
> > +     if (!bcm63xx_detect_cfe())
> >               return -EINVAL;
> >
> >       nvram = vzalloc(sizeof(*nvram));