linux-kernel - Re: [PATCH v6 4/7] hisi_ptt: Add tune function support for HiSilicon PCIe Tune and Trace device

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Date:   Thu, 7 Apr 2022 16:42:35 +0800
From:   Yicong Yang <yangyicong@...wei.com>
To:     kernel test robot <lkp@...el.com>,
        Yicong Yang <yangyicong@...ilicon.com>,
        <gregkh@...uxfoundation.org>, <helgaas@...nel.org>,
        <alexander.shishkin@...ux.intel.com>, <lorenzo.pieralisi@....com>,
        <will@...nel.org>, <mark.rutland@....com>,
        <mathieu.poirier@...aro.org>, <suzuki.poulose@....com>,
        <mike.leach@...aro.org>, <leo.yan@...aro.org>,
        <jonathan.cameron@...wei.com>, <daniel.thompson@...aro.org>,
        <joro@...tes.org>, <john.garry@...wei.com>,
        <shameerali.kolothum.thodi@...wei.com>, <robin.murphy@....com>,
        <peterz@...radead.org>, <mingo@...hat.com>, <acme@...nel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <coresight@...ts.linaro.org>, <linux-pci@...r.kernel.org>,
        <linux-perf-users@...r.kernel.org>,
        <iommu@...ts.linux-foundation.org>
CC:     <kbuild-all@...ts.01.org>, <prime.zeng@...wei.com>,
        <liuqi115@...wei.com>, <zhangshaokun@...ilicon.com>,
        <linuxarm@...wei.com>
Subject: Re: [PATCH v6 4/7] hisi_ptt: Add tune function support for HiSilicon
 PCIe Tune and Trace device

On 2022/4/7 12:28, kernel test robot wrote:
> Hi Yicong,
> 
> I love your patch! Perhaps something to improve:
> 
> [auto build test WARNING on joro-iommu/next]
> [also build test WARNING on linus/master linux/master v5.18-rc1 next-20220406]
> [cannot apply to tip/perf/core]
> [If your patch is applied to the wrong git tree, kindly drop us a note.
> And when submitting patch, we suggest to use '--base' as documented in
> https://git-scm.com/docs/git-format-patch]
> 
> url:    https://github.com/intel-lab-lkp/linux/commits/Yicong-Yang/Add-support-for-HiSilicon-PCIe-Tune-and-Trace-device/20220406-200044
> base:   https://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu.git next
> config: alpha-allyesconfig (https://download.01.org/0day-ci/archive/20220407/202204071201.AcePULOR-lkp@intel.com/config)
> compiler: alpha-linux-gcc (GCC) 11.2.0
> reproduce (this is a W=1 build):
>         wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
>         chmod +x ~/bin/make.cross
>         # https://github.com/intel-lab-lkp/linux/commit/9400668b70cbcd5ec74a52f043c3a333b80135f8
>         git remote add linux-review https://github.com/intel-lab-lkp/linux
>         git fetch --no-tags linux-review Yicong-Yang/Add-support-for-HiSilicon-PCIe-Tune-and-Trace-device/20220406-200044
>         git checkout 9400668b70cbcd5ec74a52f043c3a333b80135f8
>         # save the config file to linux build tree
>         mkdir build_dir
>         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=alpha SHELL=/bin/bash drivers/hwtracing/ptt/
> 
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kernel test robot <lkp@...el.com>
> 
> All warnings (new ones prefixed by >>):
> 
>    drivers/hwtracing/ptt/hisi_ptt.c: In function 'hisi_ptt_tune_data_get':
>>> drivers/hwtracing/ptt/hisi_ptt.c:46:16: warning: conversion from 'long unsigned int' to 'u32' {aka 'unsigned int'} changes value from '18446744073709551615' to '4294967295' [-Woverflow]
>       46 |         writel(~0UL, hisi_ptt->iobase + HISI_PTT_TUNING_DATA);
>          |                ^~~~

Thanks for the report. using of ~0U will fix this.

>    drivers/hwtracing/ptt/hisi_ptt.c: At top level:
>    drivers/hwtracing/ptt/hisi_ptt.c:1131:6: warning: no previous prototype for 'hisi_ptt_remove' [-Wmissing-prototypes]
>     1131 | void hisi_ptt_remove(struct pci_dev *pdev)
>          |      ^~~~~~~~~~~~~~~
> 

for here I missed the static identifier. will fix. thanks.

> 
> vim +46 drivers/hwtracing/ptt/hisi_ptt.c
> 
>     33	
>     34	static int hisi_ptt_tune_data_get(struct hisi_ptt *hisi_ptt,
>     35					  u32 event, u16 *data)
>     36	{
>     37		u32 reg;
>     38	
>     39		reg = readl(hisi_ptt->iobase + HISI_PTT_TUNING_CTRL);
>     40		reg &= ~(HISI_PTT_TUNING_CTRL_CODE | HISI_PTT_TUNING_CTRL_SUB);
>     41		reg |= FIELD_PREP(HISI_PTT_TUNING_CTRL_CODE | HISI_PTT_TUNING_CTRL_SUB,
>     42				  event);
>     43		writel(reg, hisi_ptt->iobase + HISI_PTT_TUNING_CTRL);
>     44	
>     45		/* Write all 1 to indicates it's the read process */
>   > 46		writel(~0UL, hisi_ptt->iobase + HISI_PTT_TUNING_DATA);
>     47	
>     48		if (!hisi_ptt_wait_tuning_finish(hisi_ptt))
>     49			return -ETIMEDOUT;
>     50	
>     51		reg = readl(hisi_ptt->iobase + HISI_PTT_TUNING_DATA);
>     52		reg &= HISI_PTT_TUNING_DATA_VAL_MASK;
>     53		*data = FIELD_GET(HISI_PTT_TUNING_DATA_VAL_MASK, reg);
>     54	
>     55		return 0;
>     56	}
>     57	
>