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

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Message-Id: <20250611000552.1989795-3-grwhyte@linux.microsoft.com>
Date: Wed, 11 Jun 2025 00:05:52 +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 2/2] PCI: Reduce FLR delay to 10ms for MSFT devices

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

Add a new quirk to reduce the delay after a FLR to 10ms
for MSFT devices. These devices complete the FLR well within the default
100ms timeframe and this path can be optimized for VF removal during
runtime repairs and driver updates. These devices do not support immediate
readiness or readiness time reporting

Signed-off-by: Graham Whyte <grwhyte@...ux.microsoft.com>
---
 drivers/pci/quirks.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index d7f4ee634263..d704606330bd 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -6335,3 +6335,23 @@ static void pci_mask_replay_timer_timeout(struct pci_dev *pdev)
 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_GLI, 0x9750, pci_mask_replay_timer_timeout);
 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_GLI, 0x9755, pci_mask_replay_timer_timeout);
 #endif
+
+#define MICROSOFT_2051_SVC 0xb210
+#define MICROSOFT_2051_MANA_MGMT 0x00b8
+#define MICROSOFT_2051_MANA_MGMT_GFT 0xb290
+
+/*
+ * For devices that don't require the full 100ms sleep
+ * after FLR and do not support immediate readiness or readiness
+ * time reporting
+ */
+static void pci_fixup_pci_flr_10msec(struct pci_dev *pdev)
+{
+	pdev->flr_delay = 10000;
+}
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_MICROSOFT, MICROSOFT_2051_SVC,
+	pci_fixup_pci_flr_10msec);
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_MICROSOFT, MICROSOFT_2051_MANA_MGMT,
+	pci_fixup_pci_flr_10msec);
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_MICROSOFT, MICROSOFT_2051_MANA_MGMT_GFT,
+	pci_fixup_pci_flr_10msec);
-- 
2.25.1