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From: "Kuppuswamy, Sathyanarayanan"  <sathyanarayanan.kuppuswamy@linux.intel.com>
To: "Raj, Ashok" <ashok.raj@intel.com>,
	sathyanarayanan.nkuppuswamy@gmail.com
Cc: bhelgaas@google.com, okaya@kernel.org, linux-pci@vger.kernel.org,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH v4 1/2] PCI/ERR: Call pci_bus_reset() before calling ->slot_reset() callback
Date: Mon, 12 Oct 2020 14:47:03 -0700
Message-ID: <9b7db59d-832c-1c21-90b6-1676ea9058ce@linux.intel.com> (raw)
In-Reply-To: <20201012210522.GA86612@otc-nc-03>



On 10/12/20 2:05 PM, Raj, Ashok wrote:
> On Sun, Oct 11, 2020 at 10:03:40PM -0700, sathyanarayanan.nkuppuswamy@gmail.com wrote:
>> From: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
>>
>> Currently if report_error_detected() or report_mmio_enabled()
>> functions requests PCI_ERS_RESULT_NEED_RESET, current
>> pcie_do_recovery() implementation does not do the requested
>> explicit device reset, but instead just calls the
>> report_slot_reset() on all affected devices. Notifying about the
>> reset via report_slot_reset() without doing the actual device
>> reset is incorrect. So call pci_bus_reset() before triggering
>> ->slot_reset() callback.
>>
>> Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
>> ---
>>   drivers/pci/pcie/err.c | 6 +-----
>>   1 file changed, 1 insertion(+), 5 deletions(-)
>>
>> diff --git a/drivers/pci/pcie/err.c b/drivers/pci/pcie/err.c
>> index c543f419d8f9..067c58728b88 100644
>> --- a/drivers/pci/pcie/err.c
>> +++ b/drivers/pci/pcie/err.c
>> @@ -181,11 +181,7 @@ pci_ers_result_t pcie_do_recovery(struct pci_dev *dev,
>>   	}
>>   
>>   	if (status == PCI_ERS_RESULT_NEED_RESET) {
>> -		/*
>> -		 * TODO: Should call platform-specific
>> -		 * functions to reset slot before calling
>> -		 * drivers' slot_reset callbacks?
>> -		 */
>> +		pci_reset_bus(dev);
> 
> pci_reset_bus() returns an error, do you need to consult that before
> unconditionally setting PCI_ERS_RESULT_RECOVERED?
Good point. I will fix this in next version.
> 
>>   		status = PCI_ERS_RESULT_RECOVERED;
>>   		pci_dbg(dev, "broadcast slot_reset message\n");
>>   		pci_walk_bus(bus, report_slot_reset, &status);
>> -- 
>> 2.17.1
>>

-- 
Sathyanarayanan Kuppuswamy
Linux Kernel Developer

  reply index

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-12  5:03 sathyanarayanan.nkuppuswamy
2020-10-12  5:03 ` [PATCH v4 2/2] PCI/ERR: Split the fatal and non-fatal error recovery handling sathyanarayanan.nkuppuswamy
2020-10-12 14:50   ` Sinan Kaya
2020-10-13 11:56   ` Christoph Hellwig
2020-10-13 15:17     ` Kuppuswamy, Sathyanarayanan
2020-10-15  6:43       ` Christoph Hellwig
2020-10-15  6:49         ` Sathyanarayanan Kuppuswamy Natarajan
2020-10-14  5:44   ` Ethan Zhao
2020-10-14  5:51     ` Kuppuswamy, Sathyanarayanan
2020-10-12 14:51 ` [PATCH v4 1/2] PCI/ERR: Call pci_bus_reset() before calling ->slot_reset() callback Sinan Kaya
2020-10-12 21:05 ` Raj, Ashok
2020-10-12 21:47   ` Kuppuswamy, Sathyanarayanan [this message]
2020-10-14  8:00     ` Ethan Zhao
2020-10-14  8:19       ` Kuppuswamy, Sathyanarayanan

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