From: Xiaochun Lee <lixc17@xxxxxxxxxx>
ACPI BIOS may disable OS native AER and DPC support to notify OS
that our platform doesn't support AER and DPC via the _OSC method.
BIOS also might leave the containment be accomplished purely in HW.
When firmware is set to non-aware OS DPC, we skip to install
EDR handler to an ACPI device.
Signed-off-by: Xiaochun Lee <lixc17@xxxxxxxxxx>
---
drivers/pci/pcie/edr.c | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
diff --git a/drivers/pci/pcie/edr.c b/drivers/pci/pcie/edr.c
index a6b9b47..97a680b 100644
--- a/drivers/pci/pcie/edr.c
+++ b/drivers/pci/pcie/edr.c
@@ -19,6 +19,17 @@
#define EDR_OST_SUCCESS 0x80
#define EDR_OST_FAILED 0x81
+static int pcie_dpc_is_native(struct pci_dev *dev)
+{
+ struct pci_host_bridge *host = pci_find_host_bridge(dev->bus);
+
+ if (!dev->dpc_cap)
+ return 0;
+
+ return pcie_ports_dpc_native || host->native_dpc;
+}
+
+
/*
* _DSM wrapper function to enable/disable DPC
* @pdev : PCI device structure
@@ -212,6 +223,11 @@ void pci_acpi_add_edr_notifier(struct pci_dev *pdev)
return;
}
+ if (!pcie_dpc_is_native(pdev) && !pcie_aer_is_native(pdev)) {
+ pci_dbg(pdev, "OS doesn't control DPC, skipping EDR init\n");
+ return;
+ }
+
status = acpi_install_notify_handler(adev->handle, ACPI_SYSTEM_NOTIFY,
edr_handle_event, pdev);
if (ACPI_FAILURE(status)) {
--
1.8.3.1
