linux-kernel - Re: [PATCH V2] scsi: ufs-debugfs: Add error counters

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Date:   Thu, 17 Dec 2020 11:49:14 +0200
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Bean Huo <huobean@...il.com>,
        "Martin K . Petersen" <martin.petersen@...cle.com>,
        "James E . J . Bottomley" <jejb@...ux.ibm.com>
Cc:     linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
        Alim Akhtar <alim.akhtar@...sung.com>,
        Avri Altman <avri.altman@....com>,
        Can Guo <cang@...eaurora.org>,
        Stanley Chu <stanley.chu@...iatek.com>
Subject: Re: [PATCH V2] scsi: ufs-debugfs: Add error counters

On 16/12/20 10:16 pm, Bean Huo wrote:
> On Wed, 2020-12-16 at 20:51 +0200, Adrian Hunter wrote:
>>                 ufshcd_variant_hba_exit(hba);
>>                 ufshcd_setup_vreg(hba, false);
>>                 ufshcd_suspend_clkscaling(hba);
>> @@ -9436,6 +9441,20 @@ int ufshcd_init(struct ufs_hba *hba, void
>> __iomem *mmio_base, unsigned int irq)
>>  }
>>  EXPORT_SYMBOL_GPL(ufshcd_init);
>>  
>> +static int __init ufshcd_core_init(void)
>> +{
>> +       ufs_debugfs_init();
>> +       return 0;
>> +}
>> +
>> +static void __exit ufshcd_core_exit(void)
>> +{
>> +       ufs_debugfs_exit();
>> +}
> 
> Hi, Adrian

Thanks for looking at the patch.

> 
> The purpose of patch is acceptable, but I don't know why you choose
> using ufshcd_core_* here. 

Do you mean you would like a different function name?  'ufshcd_init' is used
already.  The module is called ufshcd-core, so ufshcd_core_* seems appropriate.

> Also. I don't know if module_init()  is a proper way here.

Can you be more specific?  It is normal to do module initialization in
module_init().

However I do see a problem.  When builtin, initcalls are ordered according
to link order, but the Makefile does not have ufshcd-core at the top i.e.

$ cat drivers/scsi/ufs/Makefile
# SPDX-License-Identifier: GPL-2.0
# UFSHCD makefile
obj-$(CONFIG_SCSI_UFS_DWC_TC_PCI) += tc-dwc-g210-pci.o ufshcd-dwc.o
tc-dwc-g210.o
obj-$(CONFIG_SCSI_UFS_DWC_TC_PLATFORM) += tc-dwc-g210-pltfrm.o ufshcd-dwc.o
tc-dwc-g210.o
obj-$(CONFIG_SCSI_UFS_CDNS_PLATFORM) += cdns-pltfrm.o
obj-$(CONFIG_SCSI_UFS_QCOM) += ufs_qcom.o
ufs_qcom-y += ufs-qcom.o
ufs_qcom-$(CONFIG_SCSI_UFS_CRYPTO) += ufs-qcom-ice.o
obj-$(CONFIG_SCSI_UFS_EXYNOS) += ufs-exynos.o
obj-$(CONFIG_SCSI_UFSHCD) += ufshcd-core.o
ufshcd-core-y                           += ufshcd.o ufs-sysfs.o
ufshcd-core-$(CONFIG_DEBUG_FS)          += ufs-debugfs.o
ufshcd-core-$(CONFIG_SCSI_UFS_BSG)      += ufs_bsg.o
ufshcd-core-$(CONFIG_SCSI_UFS_CRYPTO) += ufshcd-crypto.o
obj-$(CONFIG_SCSI_UFSHCD_PCI) += ufshcd-pci.o
obj-$(CONFIG_SCSI_UFSHCD_PLATFORM) += ufshcd-pltfrm.o
obj-$(CONFIG_SCSI_UFS_HISI) += ufs-hisi.o
obj-$(CONFIG_SCSI_UFS_MEDIATEK) += ufs-mediatek.o
obj-$(CONFIG_SCSI_UFS_TI_J721E) += ti-j721e-ufs.o

Should be:

# SPDX-License-Identifier: GPL-2.0
# UFSHCD makefile
# Order here is important. ufshcd-core must initialize first.
ufshcd-core-y                           += ufshcd.o ufs-sysfs.o
ufshcd-core-$(CONFIG_DEBUG_FS)          += ufs-debugfs.o
ufshcd-core-$(CONFIG_SCSI_UFS_BSG)      += ufs_bsg.o
ufshcd-core-$(CONFIG_SCSI_UFS_CRYPTO) += ufshcd-crypto.o
obj-$(CONFIG_SCSI_UFS_DWC_TC_PCI) += tc-dwc-g210-pci.o ufshcd-dwc.o
tc-dwc-g210.o
obj-$(CONFIG_SCSI_UFS_DWC_TC_PLATFORM) += tc-dwc-g210-pltfrm.o ufshcd-dwc.o
tc-dwc-g210.o
obj-$(CONFIG_SCSI_UFS_CDNS_PLATFORM) += cdns-pltfrm.o
obj-$(CONFIG_SCSI_UFS_QCOM) += ufs_qcom.o
ufs_qcom-y += ufs-qcom.o
ufs_qcom-$(CONFIG_SCSI_UFS_CRYPTO) += ufs-qcom-ice.o
obj-$(CONFIG_SCSI_UFS_EXYNOS) += ufs-exynos.o
obj-$(CONFIG_SCSI_UFSHCD) += ufshcd-core.o
obj-$(CONFIG_SCSI_UFSHCD_PCI) += ufshcd-pci.o
obj-$(CONFIG_SCSI_UFSHCD_PLATFORM) += ufshcd-pltfrm.o
obj-$(CONFIG_SCSI_UFS_HISI) += ufs-hisi.o
obj-$(CONFIG_SCSI_UFS_MEDIATEK) += ufs-mediatek.o
obj-$(CONFIG_SCSI_UFS_TI_J721E) += ti-j721e-ufs.o

What do you think?

> 
> thanks,
> Bean
> 
>>
>> n
>> +
>> +module_init(ufshcd_core_init);
>> +module_exit(ufshcd_core_exit)
>