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2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/pci/pcie/portdrv_pci.c
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@@ -29,12 +29,20 @@
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  */
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 bool pcie_ports_native;
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+/*
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+ * If the user specified "pcie_ports=dpc-native", use the Linux DPC PCIe
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+ * service even if the platform hasn't given us permission.
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+ */
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+bool pcie_ports_dpc_native;
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+
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 static int __init pcie_port_setup(char *str)
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 {
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 	if (!strncmp(str, "compat", 6))
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 		pcie_ports_disabled = true;
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 	else if (!strncmp(str, "native", 6))
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 		pcie_ports_native = true;
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+	else if (!strncmp(str, "dpc-native", 10))
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+		pcie_ports_dpc_native = true;
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 	return 1;
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 }
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@@ -45,12 +53,10 @@
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 #ifdef CONFIG_PM
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 static int pcie_port_runtime_suspend(struct device *dev)
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 {
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-	return to_pci_dev(dev)->bridge_d3 ? 0 : -EBUSY;
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-}
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+	if (!to_pci_dev(dev)->bridge_d3)
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+		return -EBUSY;
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-static int pcie_port_runtime_resume(struct device *dev)
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-{
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-	return 0;
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+	return pcie_port_device_runtime_suspend(dev);
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 }
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 static int pcie_port_runtime_idle(struct device *dev)
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@@ -73,7 +79,7 @@
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 	.restore_noirq	= pcie_port_device_resume_noirq,
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 	.restore	= pcie_port_device_resume,
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 	.runtime_suspend = pcie_port_runtime_suspend,
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-	.runtime_resume	= pcie_port_runtime_resume,
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+	.runtime_resume	= pcie_port_device_runtime_resume,
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 	.runtime_idle	= pcie_port_runtime_idle,
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 };
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@@ -95,12 +101,14 @@
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 static int pcie_portdrv_probe(struct pci_dev *dev,
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 					const struct pci_device_id *id)
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 {
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+	int type = pci_pcie_type(dev);
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 	int status;
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 	if (!pci_is_pcie(dev) ||
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-	    ((pci_pcie_type(dev) != PCI_EXP_TYPE_ROOT_PORT) &&
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-	     (pci_pcie_type(dev) != PCI_EXP_TYPE_UPSTREAM) &&
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-	     (pci_pcie_type(dev) != PCI_EXP_TYPE_DOWNSTREAM)))
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+	    ((type != PCI_EXP_TYPE_ROOT_PORT) &&
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+	     (type != PCI_EXP_TYPE_UPSTREAM) &&
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+	     (type != PCI_EXP_TYPE_DOWNSTREAM) &&
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+	     (type != PCI_EXP_TYPE_RC_EC)))
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 		return -ENODEV;
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 	status = pcie_port_device_register(dev);
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@@ -109,8 +117,8 @@
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 	pci_save_state(dev);
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-	dev_pm_set_driver_flags(&dev->dev, DPM_FLAG_SMART_SUSPEND |
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-					   DPM_FLAG_LEAVE_SUSPENDED);
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+	dev_pm_set_driver_flags(&dev->dev, DPM_FLAG_NO_DIRECT_COMPLETE |
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+					   DPM_FLAG_SMART_SUSPEND);
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 	if (pci_bridge_d3_possible(dev)) {
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 		/*
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@@ -140,10 +148,17 @@
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 }
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 static pci_ers_result_t pcie_portdrv_error_detected(struct pci_dev *dev,
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-					enum pci_channel_state error)
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+					pci_channel_state_t error)
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 {
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 	/* Root Port has no impact. Always recovers. */
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 	return PCI_ERS_RESULT_CAN_RECOVER;
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+}
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+
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+static pci_ers_result_t pcie_portdrv_slot_reset(struct pci_dev *dev)
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+{
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+	pci_restore_state(dev);
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+	pci_save_state(dev);
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+	return PCI_ERS_RESULT_RECOVERED;
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 }
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 static pci_ers_result_t pcie_portdrv_mmio_enabled(struct pci_dev *dev)
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@@ -177,14 +192,19 @@
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 /*
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  * LINUX Device Driver Model
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  */
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-static const struct pci_device_id port_pci_ids[] = { {
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+static const struct pci_device_id port_pci_ids[] = {
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 	/* handle any PCI-Express port */
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-	PCI_DEVICE_CLASS(((PCI_CLASS_BRIDGE_PCI << 8) | 0x00), ~0),
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-	}, { /* end: all zeroes */ }
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+	{ PCI_DEVICE_CLASS(((PCI_CLASS_BRIDGE_PCI << 8) | 0x00), ~0) },
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+	/* subtractive decode PCI-to-PCI bridge, class type is 060401h */
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+	{ PCI_DEVICE_CLASS(((PCI_CLASS_BRIDGE_PCI << 8) | 0x01), ~0) },
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+	/* handle any Root Complex Event Collector */
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+	{ PCI_DEVICE_CLASS(((PCI_CLASS_SYSTEM_RCEC << 8) | 0x00), ~0) },
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+	{ },
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 };
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 static const struct pci_error_handlers pcie_portdrv_err_handler = {
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 	.error_detected = pcie_portdrv_error_detected,
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+	.slot_reset = pcie_portdrv_slot_reset,
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 	.mmio_enabled = pcie_portdrv_mmio_enabled,
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 	.resume = pcie_portdrv_err_resume,
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 };