linux-kernel - [PATCH v2 01/10] PCI/LUO: Register with Liveupdate Orchestrator

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Message-Id: <20250916-luo-pci-v2-1-c494053c3c08@kernel.org>
Date: Tue, 16 Sep 2025 00:45:09 -0700
From: Chris Li <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>, Pasha Tatashin <pasha.tatashin@...een.com>
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 v2 01/10] PCI/LUO: Register with Liveupdate Orchestrator

Register PCI subsystem with the Liveupdate Orchestrator
and provide noop liveupdate callbacks.

Signed-off-by: Chris Li <chrisl@...nel.org>
---
 MAINTAINERS              |  2 ++
 drivers/pci/Makefile     |  1 +
 drivers/pci/liveupdate.c | 54 ++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 57 insertions(+)

diff --git a/MAINTAINERS b/MAINTAINERS
index 91cec3288cc81aea199f730924eee1f5fda1fd72..85749a5da69f88544ccc749e9d723b1b54c0e3b7 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -14014,11 +14014,13 @@ F:	tools/testing/selftests/livepatch/
 
 LIVE UPDATE
 M:	Pasha Tatashin <pasha.tatashin@...een.com>
+M:	Chris Li <chrisl@...nel.org>
 L:	linux-kernel@...r.kernel.org
 S:	Maintained
 F:	Documentation/ABI/testing/sysfs-kernel-liveupdate
 F:	Documentation/admin-guide/liveupdate.rst
 F:	drivers/misc/liveupdate/
+F:	drivers/pci/liveupdate/
 F:	include/linux/liveupdate.h
 F:	include/uapi/linux/liveupdate.h
 F:	tools/testing/selftests/liveupdate/
diff --git a/drivers/pci/Makefile b/drivers/pci/Makefile
index 67647f1880fb8fb0629d680398f5b88d69aac660..aa1bac7aed7d12c641a6b55e56176fb3cdde4c91 100644
--- a/drivers/pci/Makefile
+++ b/drivers/pci/Makefile
@@ -37,6 +37,7 @@ obj-$(CONFIG_PCI_DOE)		+= doe.o
 obj-$(CONFIG_PCI_DYNAMIC_OF_NODES) += of_property.o
 obj-$(CONFIG_PCI_NPEM)		+= npem.o
 obj-$(CONFIG_PCIE_TPH)		+= tph.o
+obj-$(CONFIG_LIVEUPDATE)	+= liveupdate.o
 
 # Endpoint library must be initialized before its users
 obj-$(CONFIG_PCI_ENDPOINT)	+= endpoint/
diff --git a/drivers/pci/liveupdate.c b/drivers/pci/liveupdate.c
new file mode 100644
index 0000000000000000000000000000000000000000..86b4f3a2fb44781c6e323ba029db510450556fa9
--- /dev/null
+++ b/drivers/pci/liveupdate.c
@@ -0,0 +1,54 @@
+// SPDX-License-Identifier: GPL-2.0
+
+/*
+ * Copyright (c) 2025, Google LLC.
+ * Chris Li <chrisl@...nel.org>
+ */
+
+#define pr_fmt(fmt) "PCI liveupdate: " fmt
+
+#include <linux/liveupdate.h>
+
+#define PCI_SUBSYSTEM_NAME "pci"
+
+static int pci_liveupdate_prepare(void *arg, u64 *data)
+{
+	pr_info("prepare data[%llx]\n", *data);
+	return 0;
+}
+
+static int pci_liveupdate_freeze(void *arg, u64 *data)
+{
+	pr_info("freeze data[%llx]\n", *data);
+	return 0;
+}
+
+static void pci_liveupdate_cancel(void *arg, u64 data)
+{
+	pr_info("cancel data[%llx]\n", data);
+}
+
+static void pci_liveupdate_finish(void *arg, u64 data)
+{
+	pr_info("finish data[%llx]\n", data);
+}
+
+struct liveupdate_subsystem pci_liveupdate_ops = {
+	.prepare = pci_liveupdate_prepare,
+	.freeze = pci_liveupdate_freeze,
+	.cancel = pci_liveupdate_cancel,
+	.finish = pci_liveupdate_finish,
+	.name = PCI_SUBSYSTEM_NAME,
+};
+
+static int __init pci_liveupdate_init(void)
+{
+	int ret;
+
+	ret = liveupdate_register_subsystem(&pci_liveupdate_ops);
+	if (ret && liveupdate_state_updated())
+		panic("PCI liveupdate: Register subsystem failed: %d", ret);
+	WARN(ret, "PCI liveupdate: Register subsystem failed %d", ret);
+	return 0;
+}
+late_initcall_sync(pci_liveupdate_init);

-- 
2.51.0.384.g4c02a37b29-goog