linux-kernel - Re: [PATCH] soc: imx: gpc: restrict register range for regmap access

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Date:   Mon, 16 Jul 2018 10:59:19 -0300
From:   Fabio Estevam <festevam@...il.com>
To:     Anson Huang <Anson.Huang@....com>
Cc:     Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Sascha Hauer <kernel@...gutronix.de>,
        Fabio Estevam <fabio.estevam@....com>,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        NXP Linux Team <Linux-imx@....com>
Subject: Re: [PATCH] soc: imx: gpc: restrict register range for regmap access

Hi Anson,

On Mon, Jul 16, 2018 at 1:46 AM, Anson Huang <Anson.Huang@....com> wrote:
> GPC registers are NOT continuous, some registers are
> reserved and accessing them from userspace will trigger
> external abort, add regmap register access table to
> avoid below abort:
>
> root@...6slevk:~# cat /sys/kernel/debug/regmap/20dc000.gpc/registers
> [  108.480477] Unhandled fault: imprecise external abort (0x1406) at 0xb6db5004
> [  108.487985] pgd = 42b54bfd
> [  108.490741] [b6db5004] *pgd=ba1b7831
> [  108.494386] Internal error: : 1406 [#1] SMP ARM
> [  108.498943] Modules linked in:
> [  108.502043] CPU: 0 PID: 389 Comm: cat Not tainted 4.18.0-rc1-00074-gc9f1f60-dirty #482
> [  108.509982] Hardware name: Freescale i.MX6 SoloLite (Device Tree)
> [  108.516123] PC is at regmap_mmio_read32le+0x20/0x24
> [  108.521031] LR is at regmap_mmio_read+0x40/0x60
> [  108.525586] pc : [<c059cf74>]    lr : [<c059d1ac>]    psr: 20060093
> [  108.531875] sp : eccf1d98  ip : eccf1da8  fp : eccf1da4
> [  108.537122] r10: ec2d3800  r9 : eccf1f60  r8 : ecfc0000
> [  108.542370] r7 : eccf1e2c  r6 : eccf1e2c  r5 : 00000028  r4 : ec338e00
> [  108.548920] r3 : 00000000  r2 : eccf1e2c  r1 : f0980028  r0 : 00000000
> [  108.555474] Flags: nzCv  IRQs off  FIQs on  Mode SVC_32  ISA ARM  Segment none
> [  108.562720] Control: 10c5387d  Table: acf4004a  DAC: 00000051
> [  108.568491] Process cat (pid: 389, stack limit = 0xd4318a65)
> [  108.574174] Stack: (0xeccf1d98 to 0xeccf2000)
>
> Signed-off-by: Anson Huang <Anson.Huang@....com>

Thanks for this fix.

Maybe you could add a Fixes tag, so that it can be applied to stable?

Reviewed-by: Fabio Estevam <fabio.estevam@....com>