linux-kernel - Re: [PATCH NEXT 1/6] PCI/AER: Take mask into account while clearing error bits

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Date:   Thu, 07 Jun 2018 19:14:36 +0530
From:   poza@...eaurora.org
To:     Bjorn Helgaas <helgaas@...nel.org>
Cc:     Bjorn Helgaas <bhelgaas@...gle.com>,
        Philippe Ombredanne <pombredanne@...b.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Kate Stewart <kstewart@...uxfoundation.org>,
        linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        Dongdong Liu <liudongdong3@...wei.com>,
        Keith Busch <keith.busch@...el.com>, Wei Zhang <wzhang@...com>,
        Sinan Kaya <okaya@...eaurora.org>,
        Timur Tabi <timur@...eaurora.org>
Subject: Re: [PATCH NEXT 1/6] PCI/AER: Take mask into account while clearing
 error bits

On 2018-06-07 18:51, Bjorn Helgaas wrote:
> On Thu, Jun 07, 2018 at 02:00:29AM -0400, Oza Pawandeep wrote:
>> PCIe ERR_NONFATAL and ERR_FATAL are uncorrectable errors, and clearing
>> uncorrectable error bits should take error mask into account.
>> 
>> Signed-off-by: Oza Pawandeep <poza@...eaurora.org>
> 
> If/when you repost these, please include a [0/6] cover letter with an
> overview of the purpose of the series.
> 
> I assume these are for v4.19, so I'll look at them after the merge
> window.
> 
> If they fix issues introduced during the v4.18 merge window, we may be
> able to merge them during the v4.18 -rc cycle.  In this case, I would
> need specifics about what exactly the problems are.

sure Bjorn, will include cover letter.
Mostly these fixes the things which existed before 4.18 as well.
I have a question, please clarify when you get a chance.

I am posting the question on tops of PATCH-6.

Regards,
Oza.

> 
>> diff --git a/drivers/pci/pcie/aer/aerdrv.c 
>> b/drivers/pci/pcie/aer/aerdrv.c
>> index 377e576..8cbc62b 100644
>> --- a/drivers/pci/pcie/aer/aerdrv.c
>> +++ b/drivers/pci/pcie/aer/aerdrv.c
>> @@ -341,8 +341,6 @@ static pci_ers_result_t aer_root_reset(struct 
>> pci_dev *dev)
>>   */
>>  static void aer_error_resume(struct pci_dev *dev)
>>  {
>> -	int pos;
>> -	u32 status, mask;
>>  	u16 reg16;
>> 
>>  	/* Clean up Root device status */
>> @@ -350,11 +348,7 @@ static void aer_error_resume(struct pci_dev *dev)
>>  	pcie_capability_write_word(dev, PCI_EXP_DEVSTA, reg16);
>> 
>>  	/* Clean AER Root Error Status */
>> -	pos = dev->aer_cap;
>> -	pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS, &status);
>> -	pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_SEVER, &mask);
>> -	status &= ~mask; /* Clear corresponding nonfatal bits */
>> -	pci_write_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS, status);
>> +	pci_cleanup_aer_uncorrect_error_status(dev);
>>  }
>> 
>>  /**
>> diff --git a/drivers/pci/pcie/aer/aerdrv_core.c 
>> b/drivers/pci/pcie/aer/aerdrv_core.c
>> index 946f3f6..309f3f5 100644
>> --- a/drivers/pci/pcie/aer/aerdrv_core.c
>> +++ b/drivers/pci/pcie/aer/aerdrv_core.c
>> @@ -50,13 +50,17 @@ 
>> EXPORT_SYMBOL_GPL(pci_disable_pcie_error_reporting);
>>  int pci_cleanup_aer_uncorrect_error_status(struct pci_dev *dev)
>>  {
>>  	int pos;
>> -	u32 status;
>> +	u32 status, mask;
>> 
>>  	pos = dev->aer_cap;
>>  	if (!pos)
>>  		return -EIO;
>> 
>> +	/* Clean AER Root Error Status */
>> +	pos = dev->aer_cap;
>>  	pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS, &status);
>> +	pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_SEVER, &mask);
>> +	status &= ~mask; /* Clear corresponding nonfatal bits */
>>  	if (status)
>>  		pci_write_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS, status);
>> 
>> --
>> 2.7.4
>>