linux-kernel - [PATCH RFC 15/25] PCI/LUO: Restore PM related fields

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Message-Id: <20250728-luo-pci-v1-15-955b078dd653@kernel.org>
Date: Mon, 28 Jul 2025 01:24:45 -0700
From: chrisl@...nel.org
To: Bjorn Helgaas <bhelgaas@...gle.com>, 
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
 "Rafael J. Wysocki" <rafael@...nel.org>, Danilo Krummrich <dakr@...nel.org>, 
 Len Brown <lenb@...nel.org>
Cc: linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org, 
 linux-acpi@...r.kernel.org, David Matlack <dmatlack@...gle.com>, 
 Pasha Tatashin <tatashin@...gle.com>, Jason Miu <jasonmiu@...gle.com>, 
 Vipin Sharma <vipinsh@...gle.com>, Saeed Mahameed <saeedm@...dia.com>, 
 Adithya Jayachandran <ajayachandra@...dia.com>, 
 Parav Pandit <parav@...dia.com>, William Tu <witu@...dia.com>, 
 Mike Rapoport <rppt@...nel.org>, Chris Li <chrisl@...nel.org>, 
 Jason Gunthorpe <jgg@...pe.ca>, Leon Romanovsky <leon@...nel.org>
Subject: [PATCH RFC 15/25] PCI/LUO: Restore PM related fields

From: Jason Miu <jasonmiu@...gle.com>

- pm_cap
Restore the liveupdate saved `pm_cap` during the PCI Power Management
initialization.

- skip_bus_pm flag:
The flag skip_bus_pm is used in the PM suspend and resume
operations. Therefore we restore this flag for the device in the PM
init before all the operations.

- wakeup_prepared flag:
Restores the wakeup_prepared flag during the PM initialization.

Tested: QEMU VM boot test.

Signed-off-by: Chris Li <chrisl@...nel.org>
---
 drivers/pci/pci.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 9e42090fb108920995ebe34bd2535a0e23fef7fd..e0e730f7bb3932567815c390088088bd5c56f11e 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -3209,13 +3209,14 @@ void pci_pm_init(struct pci_dev *dev)
 	u16 pmc;

 	device_enable_async_suspend(&dev->dev);
-	dev->wakeup_prepared = false;

 	dev->pm_cap = 0;
 	dev->pme_support = 0;

-	/* find PCI PM capability in list */
-	pm = pci_find_capability(dev, PCI_CAP_ID_PM);
+	/* Restore PM related fields after live update or find PM capability */
+	pm = PCI_SER_GET(dev, pm_cap, pci_find_capability(dev, PCI_CAP_ID_PM));
+	dev->wakeup_prepared = PCI_SER_GET(dev, wakeup_prepared, false);
+	dev->skip_bus_pm = PCI_SER_GET(dev, skip_bus_pm, dev->skip_bus_pm);
 	if (!pm)
 		goto poweron;
 	/* Check device's ability to generate PME# */

-- 
2.50.1.487.gc89ff58d15-goog