From: Keith Busch <kbusch@kernel.org>
To: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
Cc: Danielle Costantino <dcostantino@meta.com>,
Bjorn Helgaas <bhelgaas@google.com>,
Lukas Wunner <lukas@wunner.de>,
Mahesh J Salgaonkar <mahesh@linux.ibm.com>,
Oliver O'Halloran <oohall@gmail.com>,
linux-pci@vger.kernel.org
Subject: Re: [PATCH 1/2] PCI/DPC: Clear Interrupt Status in dpc_reset_link()
Date: Thu, 12 Feb 2026 14:23:44 -0700 [thread overview]
Message-ID: <aY5E4OWE_v0Jdyd1@kbusch-mbp> (raw)
In-Reply-To: <9b75cf12-a0b4-49bf-b261-cbe02c0fe310@linux.intel.com>
On Thu, Feb 12, 2026 at 11:50:54AM -0800, Kuppuswamy Sathyanarayanan wrote:
> In case of EDR, firmware owns the interrupt handling. It just uses ACPI
> method to request OS help with recovery. Since interrupt handling is
> owned by firmware, I think firmware should clear the interrupt status.
But the PCI Firmware Specication says the OS owns the status register
while it is handling EDR notification
"
the operating system is permitted to write the following:
* Device Status Register
* Uncorrectable Error Status Register
* Correctable Error Status Register
* Root Error Status Register
* RP PIO Status Register
in the Port that triggered DPC while processing an Error Disconnect Recover
notification from firmware
"
next prev parent reply other threads:[~2026-02-12 21:23 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-02-12 19:18 [PATCH 0/2] PCI/DPC: Fix EDR recovery path issues Danielle Costantino
2026-02-12 19:18 ` [PATCH 1/2] PCI/DPC: Clear Interrupt Status in dpc_reset_link() Danielle Costantino
2026-02-12 19:50 ` Kuppuswamy Sathyanarayanan
2026-02-12 21:23 ` Keith Busch [this message]
2026-02-12 21:49 ` Kuppuswamy Sathyanarayanan
2026-02-12 22:12 ` Keith Busch
2026-02-12 22:51 ` Kuppuswamy Sathyanarayanan
2026-02-13 1:22 ` Keith Busch
2026-02-13 4:28 ` Sathyanarayanan Kuppuswamy
2026-02-13 14:01 ` Keith Busch
2026-02-13 17:08 ` Kuppuswamy Sathyanarayanan
[not found] ` <4c0d0575-0da1-49ff-878e-65622b442e98@linux.intel.com>
2026-02-13 4:29 ` Sathyanarayanan Kuppuswamy
2026-02-12 21:36 ` Lukas Wunner
2026-02-12 21:50 ` Keith Busch
2026-02-12 19:18 ` [PATCH 2/2] PCI/EDR: Defer AER status clearing until after recovery Danielle Costantino
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