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From: Sinan Kaya <okaya@kernel.org>
To: "Kuppuswamy,
	Sathyanarayanan"  <sathyanarayanan.kuppuswamy@linux.intel.com>,
	Bjorn Helgaas <helgaas@kernel.org>
Cc: bhelgaas@google.com, linux-pci@vger.kernel.org,
	linux-kernel@vger.kernel.org, ashok.raj@intel.com,
	Jay Vosburgh <jay.vosburgh@canonical.com>
Subject: Re: [PATCH v3 1/1] PCI/ERR: Fix reset logic in pcie_do_recovery() call
Date: Thu, 24 Sep 2020 16:52:19 -0400
Message-ID: <aefd8842-90c4-836a-b43a-f21c5428d2ba@kernel.org> (raw)
In-Reply-To: <a647f485-8db4-db45-f404-940b55117b53@linux.intel.com>

On 9/24/2020 12:06 AM, Kuppuswamy, Sathyanarayanan wrote:
> For problem description, please check the following details
> 
> Current pcie_do_recovery() implementation has following two issues:
> 
> 1. Fatal (DPC) error recovery is currently broken for non-hotplug
> capable devices. Current fatal error recovery implementation relies
> on PCIe hotplug (pciehp) handler for detaching and re-enumerating
> the affected devices/drivers. pciehp handler listens for DLLSC state
> changes and handles device/driver detachment on DLLSC_LINK_DOWN event
> and re-enumeration on DLLSC_LINK_UP event. So when dealing with
> non-hotplug capable devices, recovery code does not restore the state
> of the affected devices correctly. Correct implementation should
> restore the device state and call report_slot_reset() function after
> resetting the link to restore the state of the device/driver.
> 

So, this is a matter of moving the save/restore logic from the hotplug
driver into common code so that DPC slot reset takes advantage of it?

If that's direction we are going, this is fine change IMO.

> You can find fatal non-hotplug related issues reported in following links:
> 
> https://lore.kernel.org/linux-pci/20200527083130.4137-1-Zhiqiang.Hou@nxp.com/
> 
> https://lore.kernel.org/linux-pci/12115.1588207324@famine/
> https://lore.kernel.org/linux-pci/0e6f89cd6b9e4a72293cc90fafe93487d7c2d295.1585000084.git.sathyanarayanan.kuppuswamy@linux.intel.com/
> 
> 
> 2. For non-fatal errors if report_error_detected() or
> report_mmio_enabled() functions requests PCI_ERS_RESULT_NEED_RESET then
> current pcie_do_recovery() implementation does not do the requested
> explicit device reset, 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.
> 

This makes sens too. There seems to be an ordering issue per your
description.

> To fix above issues, use PCI_ERS_RESULT_NEED_RESET as error state after
> successful reset_link() operation. This will ensure ->slot_reset() be
> called after reset_link() operation for fatal errors. 

You lost me here. Why do we want to do secondary bus reset on top of
DPC reset?

> Also call
> pci_bus_reset() to do slot/bus reset() before triggering device specific
> ->slot_reset() callback. Also, using pci_bus_reset() will restore the state
> of the devices after performing the reset operation.
> 
> Even though using pci_bus_reset() will do redundant reset operation after
> ->reset_link() for fatal errors, it should should affect the functional
> behavior.


  reply index

Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <3cad1a07-509b-ef51-f635-71def2ff8293@linux.intel.com>
2020-09-22 23:33 ` Bjorn Helgaas
2020-09-22 23:44   ` Kuppuswamy, Sathyanarayanan
2020-09-24  1:15     ` Sinan Kaya
2020-09-24  2:04       ` Kuppuswamy, Sathyanarayanan
2020-09-24  2:16         ` Sinan Kaya
2020-09-24  2:51           ` Kuppuswamy, Sathyanarayanan
2020-09-24  3:13             ` Sinan Kaya
2020-09-24  4:06               ` Kuppuswamy, Sathyanarayanan
2020-09-24 20:52                 ` Sinan Kaya [this message]
2020-09-25  5:11                   ` Kuppuswamy, Sathyanarayanan
2020-09-25 16:55                     ` Sinan Kaya
2020-09-25 17:11                       ` Kuppuswamy, Sathyanarayanan
2020-09-25 17:47                         ` Sinan Kaya
2020-09-25 18:16                           ` Kuppuswamy, Sathyanarayanan
2020-09-25 18:30                             ` Sinan Kaya
2020-09-28  2:43                               ` Kuppuswamy, Sathyanarayanan
2020-09-28  8:41                                 ` Ethan Zhao
2020-09-28 11:17                                 ` Sinan Kaya
2020-09-28 12:16                                   ` Sinan Kaya
2020-09-28 17:15                                   ` Kuppuswamy, Sathyanarayanan
2020-09-28 18:02                                     ` Sinan Kaya
2020-09-28 18:25                                       ` Sinan Kaya
2020-09-28 18:32                                         ` Kuppuswamy, Sathyanarayanan
2020-10-12  5:13                                           ` Kuppuswamy, Sathyanarayanan
2020-10-12 14:51                                             ` Sinan Kaya
2020-09-28 12:11                                 ` Sinan Kaya
2020-09-25 23:50                             ` Sinan Kaya
2020-07-24 19:07 sathyanarayanan.kuppuswamy
2020-09-01  5:41 ` Kuppuswamy, Sathyanarayanan
2020-09-22 18:52 ` Bjorn Helgaas

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