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Subject[PATCH v3 7/8] PCI: Add support for unbinding the generic PCI host controller
Date
From: Jan Kiszka <jan.kiszka@siemens.com>

Particularly useful when working in virtual environments where the
controller may come and go, but possibly not only there.

CC: Will Deacon <will.deacon@arm.com>
CC: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
---
drivers/pci/host/pci-host-common.c | 13 +++++++++++++
drivers/pci/host/pci-host-generic.c | 1 +
include/linux/pci-ecam.h | 1 +
3 files changed, 15 insertions(+)

diff --git a/drivers/pci/host/pci-host-common.c b/drivers/pci/host/pci-host-common.c
index 5d028f53fdcd..d8f10451f273 100644
--- a/drivers/pci/host/pci-host-common.c
+++ b/drivers/pci/host/pci-host-common.c
@@ -101,5 +101,18 @@ int pci_host_common_probe(struct platform_device *pdev,
return ret;
}

+ platform_set_drvdata(pdev, bridge->bus);
+ return 0;
+}
+
+int pci_host_common_remove(struct platform_device *pdev)
+{
+ struct pci_bus *bus = platform_get_drvdata(pdev);
+
+ pci_lock_rescan_remove();
+ pci_stop_root_bus(bus);
+ pci_remove_root_bus(bus);
+ pci_unlock_rescan_remove();
+
return 0;
}
diff --git a/drivers/pci/host/pci-host-generic.c b/drivers/pci/host/pci-host-generic.c
index 45319ee3b484..dea3ec7592a2 100644
--- a/drivers/pci/host/pci-host-generic.c
+++ b/drivers/pci/host/pci-host-generic.c
@@ -95,5 +95,6 @@ static struct platform_driver gen_pci_driver = {
.suppress_bind_attrs = true,
},
.probe = gen_pci_probe,
+ .remove = pci_host_common_remove,
};
builtin_platform_driver(gen_pci_driver);
diff --git a/include/linux/pci-ecam.h b/include/linux/pci-ecam.h
index baadad1aabbc..29efa09d686b 100644
--- a/include/linux/pci-ecam.h
+++ b/include/linux/pci-ecam.h
@@ -62,5 +62,6 @@ extern struct pci_ecam_ops xgene_v2_pcie_ecam_ops; /* APM X-Gene PCIe v2.x */
/* for DT-based PCI controllers that support ECAM */
int pci_host_common_probe(struct platform_device *pdev,
struct pci_ecam_ops *ops);
+int pci_host_common_remove(struct platform_device *pdev);
#endif
#endif
--
2.13.6
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