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Subject[RFC PATCH v1 6/6] PCI: update AER configuration when PCI hotplug event happens
From: Jiang Liu <liuj97@gmail.com>

The AER driver only configures downstream PCIe devices at driver
binding time and all hot-added PCIe devices won't be managed by
the AER driver. So hook PCI device hotplug events to setup AER
configuration for hot-added PCIe devices.

So hook the BUS_NOTIFY_ADD_DEVICE/BUS_NOTIFY_DEL_DEVICE events to
setup AER configuration for hot-added PCIe devices.

Signed-off-by: Jiang Liu <liuj97@gmail.com>
---
drivers/pci/pcie/aer/aerdrv.c | 72 ++++++++++++++++++++++++++++++++++++++++-
1 files changed, 71 insertions(+), 1 deletions(-)

diff --git a/drivers/pci/pcie/aer/aerdrv.c b/drivers/pci/pcie/aer/aerdrv.c
index 58ad791..7033410 100644
--- a/drivers/pci/pcie/aer/aerdrv.c
+++ b/drivers/pci/pcie/aer/aerdrv.c
@@ -410,6 +410,69 @@ static void aer_error_resume(struct pci_dev *dev)
pci_write_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS, status);
}

+static int pci_root_port_aer_support(struct pci_dev *dev)
+{
+ int rc, pos;
+ u32 reg32 = 0;
+
+ if (!pci_is_pcie(dev))
+ return false;
+
+ if (!pci_aer_available() || aer_acpi_firmware_first())
+ return false;
+
+ /* Search for root port */
+ while (dev->pcie_type != PCI_EXP_TYPE_ROOT_PORT) {
+ dev = dev->bus->self;
+ if (!dev)
+ return false;
+ }
+
+ pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR);
+ if (!pos)
+ return false;
+
+ rc = pci_read_config_dword(dev, pos + PCI_ERR_ROOT_COMMAND, &reg32);
+ if (rc || reg32 == 0xFFFFFFFF)
+ return false;
+
+ if (reg32 & (PCI_ERR_ROOT_CMD_COR_EN |
+ PCI_ERR_ROOT_CMD_NONFATAL_EN |
+ PCI_ERR_ROOT_CMD_FATAL_EN))
+ return true;
+
+ return false;
+}
+
+static void acpi_pcie_aer_notify_dev(struct pci_dev *dev, bool enable)
+{
+ if (pci_root_port_aer_support(dev))
+ set_device_error_reporting(dev, &enable);
+}
+
+static int acpi_pcie_aer_notify_fn(struct notifier_block *nb,
+ unsigned long event, void *data)
+{
+ struct device *dev = data;
+
+ switch (event) {
+ case BUS_NOTIFY_ADD_DEVICE:
+ acpi_pcie_aer_notify_dev(to_pci_dev(dev), true);
+ break;
+ case BUS_NOTIFY_DEL_DEVICE:
+ acpi_pcie_aer_notify_dev(to_pci_dev(dev), false);
+ break;
+ default:
+ return NOTIFY_DONE;
+ }
+
+ return NOTIFY_OK;
+}
+
+static struct notifier_block acpi_pcie_aer_notifier = {
+ .notifier_call = &acpi_pcie_aer_notify_fn,
+};
+
/**
* aer_service_init - register AER root service driver
*
@@ -417,9 +480,15 @@ static void aer_error_resume(struct pci_dev *dev)
*/
static int __init aer_service_init(void)
{
+ int ret;
+
if (!pci_aer_available() || aer_acpi_firmware_first())
return -ENXIO;
- return pcie_port_service_register(&aerdriver);
+ ret = pcie_port_service_register(&aerdriver);
+ if (!ret)
+ bus_register_notifier(&pci_bus_type, &acpi_pcie_aer_notifier);
+
+ return ret;
}

/**
@@ -429,6 +498,7 @@ static int __init aer_service_init(void)
*/
static void __exit aer_service_exit(void)
{
+ bus_unregister_notifier(&pci_bus_type, &acpi_pcie_aer_notifier);
pcie_port_service_unregister(&aerdriver);
}

--
1.7.1



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