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

Chris Li
2025-09-16T07:45:15Z

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

Signed-off-by: Chris Li <chrisl@kernel.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@soleen.com>
+M: Chris Li <chrisl@kernel.org>
L: linux-kernel@vger.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@kernel.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