linux-kernel - Re: [PATCH v2 0/3] PCI/DPC: Clean up DPC vs AER/EDR ownership and Kconfig

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Date: Tue, 27 Feb 2024 14:18:03 +0800
From: Ethan Zhao <haifeng.zhao@...ux.intel.com>
To: Bjorn Helgaas <helgaas@...nel.org>, linux-pci@...r.kernel.org
Cc: linux-kernel@...r.kernel.org,
 Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@...ux.intel.com>,
 Matthew W Carlis <mattc@...estorage.com>, Keith Busch <kbusch@...nel.org>,
 Lukas Wunner <lukas@...ner.de>,
 Mika Westerberg <mika.westerberg@...ux.intel.com>,
 Jesse Brandeburg <jesse.brandeburg@...el.com>,
 Bjorn Helgaas <bhelgaas@...gle.com>
Subject: Re: [PATCH v2 0/3] PCI/DPC: Clean up DPC vs AER/EDR ownership and
 Kconfig

On 2/23/2024 6:15 AM, Bjorn Helgaas wrote:
> From: Bjorn Helgaas <bhelgaas@...gle.com>
>
> Previously we could request control of DPC without AER, which is illegal
> per spec.  Also, we could enable CONFIG_PCIE_DPC without CONFIG_PCIE_EDR,
> which is also illegal.  This series addresses both.

I have a question here, how to understand the relationship EDR & AER ?
somewhere EDR touches AER status without checking _OSC granted bits,
such as
    pci_aer_raw_clear_status(edev);

sometimes EDR calling AER with host->native_aer checked, like

pcie_do_recovery()
{
  ...
  if (host->native_aer || pcie_ports_native) {
		pcie_clear_device_status(dev);
		pci_aer_clear_nonfatal_status(dev);
	}
  ...
}

That is really confusing. could we do some cleanup to eliminate it ?
such as seperate AER code into common code and runtime part.


Thanks,
Ethan
  

>
> Bjorn Helgaas (3):
>    PCI/DPC: Request DPC only if also requesting AER
>    PCI/DPC: Remove CONFIG_PCIE_EDR
>    PCI/DPC: Encapsulate pci_acpi_add_edr_notifier()
>
>   drivers/acpi/pci_root.c   | 22 ++++++++++++----------
>   drivers/pci/pci.h         |  4 ++++
>   drivers/pci/pcie/Kconfig  | 14 ++++----------
>   drivers/pci/pcie/Makefile |  5 ++++-
>   drivers/pci/pcie/dpc.c    | 10 ----------
>   include/linux/pci-acpi.h  |  8 --------
>   6 files changed, 24 insertions(+), 39 deletions(-)
>