Re: next/master bisection: baseline.dmesg.alert on imx8mn-ddr4-evk

From: Guillaume Tucker
Date: Mon Apr 27 2020 - 09:00:47 EST

Please see the bisection report below about a boot failure.

Reports aren't automatically sent to the public while we're
trialing new bisection features on kernelci.org but this one
looks valid.

The log shows a kernel NULL pointer derefence:

https://storage.kernelci.org/next/master/next-20200424/arm64/defconfig/gcc-8/lab-baylibre/baseline-imx8mn-ddr4-evk.html#L750

Guillaume

On 25/04/2020 15:58, kernelci.org bot wrote:
> * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
> * This automated bisection report was sent to you on the basis *
> * that you may be involved with the breaking commit it has *
> * found. No manual investigation has been done to verify it, *
> * and the root cause of the problem may be somewhere else. *
> * *
> * If you do send a fix, please include this trailer: *
> * Reported-by: "kernelci.org bot" <bot@xxxxxxxxxxxx> *
> * *
> * Hope this helps! *
> * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
>
> next/master bisection: baseline.dmesg.alert on imx8mn-ddr4-evk
>
> Summary:
> Start: 8bdabd09ec86a Add linux-next specific files for 20200424
> Plain log: https://storage.kernelci.org/next/master/next-20200424/arm64/defconfig/gcc-8/lab-baylibre/baseline-imx8mn-ddr4-evk.txt
> HTML log: https://storage.kernelci.org/next/master/next-20200424/arm64/defconfig/gcc-8/lab-baylibre/baseline-imx8mn-ddr4-evk.html
> Result: 2fbd0de2a20fb cpufreq: imx-cpufreq-dt: support i.MX7ULP
>
> Checks:
> revert: PASS
> verify: PASS
>
> Parameters:
> Tree: next
> URL: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
> Branch: master
> Target: imx8mn-ddr4-evk
> CPU arch: arm64
> Lab: lab-baylibre
> Compiler: gcc-8
> Config: defconfig
> Test case: baseline.dmesg.alert
>
> Breaking commit found:
>
> -------------------------------------------------------------------------------
> commit 2fbd0de2a20fbea8b1f5250935e9f1f0e4441b0f
> Author: Peng Fan <peng.fan@xxxxxxx>
> Date: Mon Apr 20 15:55:14 2020 +0800
>
> cpufreq: imx-cpufreq-dt: support i.MX7ULP
>
> i.MX7ULP's ARM core clock design is totally different compared
> with i.MX7D/8M SoCs which supported by imx-cpufreq-dt. It needs
> get_intermediate and target_intermedate to configure clk MUX ready,
> before let OPP configure ARM core clk.
> |---FIRC
> |------RUN---...---SCS(MUX2) --------|
> ARM --(MUX1) |---SPLL_PFD0(CLK_SET_RATE_GATE)
> |------HSRUN--...--HSRUN_SCS(MUX3)---|
> |---SRIC
>
> FIRC is step clk, SPLL_PFD0 is the normal clk driving ARM core.
> MUX2 and MUX3 share same inputs. So if MUX2/MUX3 both sources from
> SPLL_PFD0, both MUXes will lose input when configure SPLL_PFD0.
> So the target_intermediate will configure MUX2/MUX3 to FIRC, to avoid
> ARM core lose clk when configure SPLL_PFD0.
>
> Signed-off-by: Peng Fan <peng.fan@xxxxxxx>
> Signed-off-by: Viresh Kumar <viresh.kumar@xxxxxxxxxx>
>
> diff --git a/drivers/cpufreq/imx-cpufreq-dt.c b/drivers/cpufreq/imx-cpufreq-dt.c
> index de206d2745feb..b019b05940e83 100644
> --- a/drivers/cpufreq/imx-cpufreq-dt.c
> +++ b/drivers/cpufreq/imx-cpufreq-dt.c
> @@ -3,7 +3,9 @@
> * Copyright 2019 NXP
> */
>
> +#include <linux/clk.h>
> #include <linux/cpu.h>
> +#include <linux/cpufreq.h>
> #include <linux/err.h>
> #include <linux/init.h>
> #include <linux/kernel.h>
> @@ -12,8 +14,11 @@
> #include <linux/of.h>
> #include <linux/platform_device.h>
> #include <linux/pm_opp.h>
> +#include <linux/regulator/consumer.h>
> #include <linux/slab.h>
>
> +#include "cpufreq-dt.h"
> +
> #define OCOTP_CFG3_SPEED_GRADE_SHIFT 8
> #define OCOTP_CFG3_SPEED_GRADE_MASK (0x3 << 8)
> #define IMX8MN_OCOTP_CFG3_SPEED_GRADE_MASK (0xf << 8)
> @@ -22,13 +27,62 @@
> #define IMX8MP_OCOTP_CFG3_MKT_SEGMENT_SHIFT 5
> #define IMX8MP_OCOTP_CFG3_MKT_SEGMENT_MASK (0x3 << 5)
>
> +#define IMX7ULP_MAX_RUN_FREQ 528000
> +
> /* cpufreq-dt device registered by imx-cpufreq-dt */
> static struct platform_device *cpufreq_dt_pdev;
> static struct opp_table *cpufreq_opp_table;
> +static struct device *cpu_dev;
> +
> +enum IMX7ULP_CPUFREQ_CLKS {
> + ARM,
> + CORE,
> + SCS_SEL,
> + HSRUN_CORE,
> + HSRUN_SCS_SEL,
> + FIRC,
> +};
> +
> +static struct clk_bulk_data imx7ulp_clks[] = {
> + { .id = "arm" },
> + { .id = "core" },
> + { .id = "scs_sel" },
> + { .id = "hsrun_core" },
> + { .id = "hsrun_scs_sel" },
> + { .id = "firc" },
> +};
> +
> +static unsigned int imx7ulp_get_intermediate(struct cpufreq_policy *policy,
> + unsigned int index)
> +{
> + return clk_get_rate(imx7ulp_clks[FIRC].clk);
> +}
> +
> +static int imx7ulp_target_intermediate(struct cpufreq_policy *policy,
> + unsigned int index)
> +{
> + unsigned int newfreq = policy->freq_table[index].frequency;
> +
> + clk_set_parent(imx7ulp_clks[SCS_SEL].clk, imx7ulp_clks[FIRC].clk);
> + clk_set_parent(imx7ulp_clks[HSRUN_SCS_SEL].clk, imx7ulp_clks[FIRC].clk);
> +
> + if (newfreq > IMX7ULP_MAX_RUN_FREQ)
> + clk_set_parent(imx7ulp_clks[ARM].clk,
> + imx7ulp_clks[HSRUN_CORE].clk);
> + else
> + clk_set_parent(imx7ulp_clks[ARM].clk, imx7ulp_clks[CORE].clk);
> +
> + return 0;
> +}
> +
> +static struct cpufreq_dt_platform_data imx7ulp_data = {
> + .target_intermediate = imx7ulp_target_intermediate,
> + .get_intermediate = imx7ulp_get_intermediate,
> +};
>
> static int imx_cpufreq_dt_probe(struct platform_device *pdev)
> {
> - struct device *cpu_dev = get_cpu_device(0);
> + struct platform_device *dt_pdev;
> u32 cell_value, supported_hw[2];
> int speed_grade, mkt_segment;
> int ret;
> @@ -36,6 +90,29 @@ static int imx_cpufreq_dt_probe(struct platform_device *pdev)
> if (!of_find_property(cpu_dev->of_node, "cpu-supply", NULL))
> return -ENODEV;
>
> + cpu_dev = get_cpu_device(0);
> +
> + if (of_machine_is_compatible("fsl,imx7ulp")) {
> + ret = clk_bulk_get(cpu_dev, ARRAY_SIZE(imx7ulp_clks),
> + imx7ulp_clks);
> + if (ret)
> + return ret;
> +
> + dt_pdev = platform_device_register_data(NULL, "cpufreq-dt",
> + -1, &imx7ulp_data,
> + sizeof(imx7ulp_data));
> + if (IS_ERR(dt_pdev)) {
> + clk_bulk_put(ARRAY_SIZE(imx7ulp_clks), imx7ulp_clks);
> + ret = PTR_ERR(dt_pdev);
> + dev_err(&pdev->dev, "Failed to register cpufreq-dt: %d\n", ret);
> + return ret;
> + }
> +
> + cpufreq_dt_pdev = dt_pdev;
> +
> + return 0;
> + }
> +
> ret = nvmem_cell_read_u32(cpu_dev, "speed_grade", &cell_value);
> if (ret)
> return ret;
> @@ -98,7 +175,10 @@ static int imx_cpufreq_dt_probe(struct platform_device *pdev)
> static int imx_cpufreq_dt_remove(struct platform_device *pdev)
> {
> platform_device_unregister(cpufreq_dt_pdev);
> - dev_pm_opp_put_supported_hw(cpufreq_opp_table);
> + if (!of_machine_is_compatible("fsl,imx7ulp"))
> + dev_pm_opp_put_supported_hw(cpufreq_opp_table);
> + else
> + clk_bulk_put(ARRAY_SIZE(imx7ulp_clks), imx7ulp_clks);
>
> return 0;
> }
> -------------------------------------------------------------------------------
>
>
> Git bisection log:
>
> -------------------------------------------------------------------------------
> git bisect start
> # good: [a6d0b83f25073bdf08b8547aeff961a62c6ab229] net: bcmgenet: correct per TX/RX ring statistics
> git bisect good a6d0b83f25073bdf08b8547aeff961a62c6ab229
> # bad: [8bdabd09ec86a993419c8c98a4f34c12bc902c6c] Add linux-next specific files for 20200424
> git bisect bad 8bdabd09ec86a993419c8c98a4f34c12bc902c6c
> # bad: [556a775f0602376f6d4bf6ec24f817314d7e5cac] Merge remote-tracking branch 'crypto/master'
> git bisect bad 556a775f0602376f6d4bf6ec24f817314d7e5cac
> # good: [fa5fcf1b786dcda5965372f84baf252cf50fc849] Merge remote-tracking branch 'btrfs/for-next'
> git bisect good fa5fcf1b786dcda5965372f84baf252cf50fc849
> # good: [16aedbb33c21617b2dcdcc50d57f3a17557cc825] Merge remote-tracking branch 'jc_docs/docs-next'
> git bisect good 16aedbb33c21617b2dcdcc50d57f3a17557cc825
> # bad: [920b40f1dfe3adc7d9640e95bb7c08464d0ae7ba] Merge remote-tracking branch 'rdma/for-next'
> git bisect bad 920b40f1dfe3adc7d9640e95bb7c08464d0ae7ba
> # good: [a735e6b80d911fc1f452cea328c61779445e1054] media: cec/usb: depends on USB_SUPPORT and TTY
> git bisect good a735e6b80d911fc1f452cea328c61779445e1054
> # good: [17ce5e6d72d5acc838e8e6218c3fadc2a7abe7da] media: admin-guide: improve cardlist.rst documentation
> git bisect good 17ce5e6d72d5acc838e8e6218c3fadc2a7abe7da
> # bad: [a82dbfaeede6ea5c12013c8034f9501dd112a482] Merge remote-tracking branch 'cpufreq-arm/cpufreq/arm/linux-next'
> git bisect bad a82dbfaeede6ea5c12013c8034f9501dd112a482
> # good: [4bdbff4da40584ec2225bb429b7c66ad54d19cda] media: tuners: Kconfig: add some missing VIDEO_V4L2 dependencies
> git bisect good 4bdbff4da40584ec2225bb429b7c66ad54d19cda
> # good: [01186efb19343e798e90318671e534c272a03723] Documentation: PM: sleep: Update driver flags documentation
> git bisect good 01186efb19343e798e90318671e534c272a03723
> # good: [366562a463dd2a93dea0e2743b1b0070f14339a9] Merge branches 'acpi-pci', 'acpi-button' and 'pm-tools' into linux-next
> git bisect good 366562a463dd2a93dea0e2743b1b0070f14339a9
> # good: [574f732cdc1c3e7bb1389eb8515b3d87a476d591] Merge remote-tracking branch 'pm/linux-next'
> git bisect good 574f732cdc1c3e7bb1389eb8515b3d87a476d591
> # good: [11d89b0a820f8d1edb7780b971597c357864dec7] cpufreq: Add i.MX7ULP to cpufreq-dt-platdev blacklist
> git bisect good 11d89b0a820f8d1edb7780b971597c357864dec7
> # bad: [2fbd0de2a20fbea8b1f5250935e9f1f0e4441b0f] cpufreq: imx-cpufreq-dt: support i.MX7ULP
> git bisect bad 2fbd0de2a20fbea8b1f5250935e9f1f0e4441b0f
> # first bad commit: [2fbd0de2a20fbea8b1f5250935e9f1f0e4441b0f] cpufreq: imx-cpufreq-dt: support i.MX7ULP
> -------------------------------------------------------------------------------
>