linux-kernel - [PATCH v3 0/2] PCI: Reduce FLR delay to 10ms for MSFT devices

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Message-Id: <20250611000552.1989795-1-grwhyte@linux.microsoft.com>
Date: Wed, 11 Jun 2025 00:05:50 +0000
From: grwhyte@...ux.microsoft.com
To: linux-pci@...r.kernel.org
Cc: shyamsaini@...ux.microsoft.com,
	code@...icks.com,
	Okaya@...nel.org,
	bhelgaas@...gle.com,
	linux-kernel@...r.kernel.org
Subject: [PATCH v3 0/2] PCI: Reduce FLR delay to 10ms for MSFT devices

From: Graham Whyte <grwhyte@...ux.microsoft.com>

Add a new flr_delay member of the pci_dev struct to allow customization of
the delay after FLR for devices that do not support immediate readiness
or readiness time reporting. The main scenario this addresses is VF
removal and rescan during runtime repairs and driver updates, which,
if fixed to 100ms, introduces significant delays across multiple VFs.
These delays are unnecessary for devices that complete the FLR well
within this timeframe.

Patch 1 adds the flr_delay member to the pci_dev struct
Patch 2 adds the msft device specific quirk to utilize the flr_delay

---
v2->v3:
- Removed Microsoft specific pcie reset reset, replaced with customizable flr_delay parameter
- Changed msleep in pcie_flr to usleep_range to support flr delays of under 20ms 
v1->v2:
- Removed unnecessary EXPORT_SYMBOL_GPL for function pci_dev_wait
- Link to thread:https://lore.kernel.org/linux-pci/?q=f%3Agrwhyte&x=t#m7453647902a1b22840f5e39434a631fd7b2515ce'

Link to V1: https://lore.kernel.org/linux-pci/20250522085253.GN7435@unreal/T/#m7453647902a1b22840f5e39434a631fd7b2515ce  

Graham Whyte (2):
  PCI: Add flr_delay parameter to pci_dev struct
  PCI: Reduce FLR delay to 10ms for MSFT devices

 drivers/pci/pci.c    |  8 ++++++--
 drivers/pci/pci.h    |  2 ++
 drivers/pci/quirks.c | 20 ++++++++++++++++++++
 include/linux/pci.h  |  1 +
 4 files changed, 29 insertions(+), 2 deletions(-)

-- 
2.25.1