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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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35a0b2378c
Prior toeed85ff4c0("PCI/DPC: Enable DPC only if AER is available"), Linux handled DPC events regardless of whether firmware had granted it ownership of AER or DPC, e.g., via _OSC. PCIe r5.0, sec 6.2.10, recommends that the OS link control of DPC to control of AER, so aftereed85ff4c0, Linux handles DPC events only if it has control of AER. On platforms that do not grant OS control of AER via _OSC, Linux DPC handling worked beforeeed85ff4c0but not after. To make Linux DPC handling work on those platforms the same way they did before, add a "pcie_ports=dpc-native" kernel parameter that makes Linux handle DPC events regardless of whether it has control of AER. [bhelgaas: commit log, move pcie_ports_dpc_native to drivers/pci/] Link: https://lore.kernel.org/r/20191023192205.97024-1-olof@lixom.net Signed-off-by: Olof Johansson <olof@lixom.net> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
168 lines
5.0 KiB
C
168 lines
5.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Purpose: PCI Express Port Bus Driver's Internal Data Structures
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*
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* Copyright (C) 2004 Intel
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* Copyright (C) Tom Long Nguyen (tom.l.nguyen@intel.com)
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*/
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#ifndef _PORTDRV_H_
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#define _PORTDRV_H_
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#include <linux/compiler.h>
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/* Service Type */
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#define PCIE_PORT_SERVICE_PME_SHIFT 0 /* Power Management Event */
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#define PCIE_PORT_SERVICE_PME (1 << PCIE_PORT_SERVICE_PME_SHIFT)
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#define PCIE_PORT_SERVICE_AER_SHIFT 1 /* Advanced Error Reporting */
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#define PCIE_PORT_SERVICE_AER (1 << PCIE_PORT_SERVICE_AER_SHIFT)
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#define PCIE_PORT_SERVICE_HP_SHIFT 2 /* Native Hotplug */
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#define PCIE_PORT_SERVICE_HP (1 << PCIE_PORT_SERVICE_HP_SHIFT)
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#define PCIE_PORT_SERVICE_DPC_SHIFT 3 /* Downstream Port Containment */
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#define PCIE_PORT_SERVICE_DPC (1 << PCIE_PORT_SERVICE_DPC_SHIFT)
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#define PCIE_PORT_SERVICE_BWNOTIF_SHIFT 4 /* Bandwidth notification */
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#define PCIE_PORT_SERVICE_BWNOTIF (1 << PCIE_PORT_SERVICE_BWNOTIF_SHIFT)
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#define PCIE_PORT_DEVICE_MAXSERVICES 5
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extern bool pcie_ports_dpc_native;
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#ifdef CONFIG_PCIEAER
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int pcie_aer_init(void);
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#else
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static inline int pcie_aer_init(void) { return 0; }
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#endif
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#ifdef CONFIG_HOTPLUG_PCI_PCIE
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int pcie_hp_init(void);
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#else
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static inline int pcie_hp_init(void) { return 0; }
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#endif
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#ifdef CONFIG_PCIE_PME
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int pcie_pme_init(void);
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#else
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static inline int pcie_pme_init(void) { return 0; }
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#endif
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#ifdef CONFIG_PCIE_DPC
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int pcie_dpc_init(void);
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#else
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static inline int pcie_dpc_init(void) { return 0; }
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#endif
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#ifdef CONFIG_PCIE_BW
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int pcie_bandwidth_notification_init(void);
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#else
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static inline int pcie_bandwidth_notification_init(void) { return 0; }
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#endif
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/* Port Type */
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#define PCIE_ANY_PORT (~0)
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struct pcie_device {
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int irq; /* Service IRQ/MSI/MSI-X Vector */
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struct pci_dev *port; /* Root/Upstream/Downstream Port */
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u32 service; /* Port service this device represents */
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void *priv_data; /* Service Private Data */
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struct device device; /* Generic Device Interface */
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};
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#define to_pcie_device(d) container_of(d, struct pcie_device, device)
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static inline void set_service_data(struct pcie_device *dev, void *data)
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{
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dev->priv_data = data;
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}
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static inline void *get_service_data(struct pcie_device *dev)
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{
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return dev->priv_data;
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}
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struct pcie_port_service_driver {
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const char *name;
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int (*probe)(struct pcie_device *dev);
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void (*remove)(struct pcie_device *dev);
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int (*suspend)(struct pcie_device *dev);
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int (*resume_noirq)(struct pcie_device *dev);
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int (*resume)(struct pcie_device *dev);
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int (*runtime_suspend)(struct pcie_device *dev);
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int (*runtime_resume)(struct pcie_device *dev);
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/* Device driver may resume normal operations */
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void (*error_resume)(struct pci_dev *dev);
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/* Link Reset Capability - AER service driver specific */
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pci_ers_result_t (*reset_link)(struct pci_dev *dev);
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int port_type; /* Type of the port this driver can handle */
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u32 service; /* Port service this device represents */
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struct device_driver driver;
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};
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#define to_service_driver(d) \
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container_of(d, struct pcie_port_service_driver, driver)
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int pcie_port_service_register(struct pcie_port_service_driver *new);
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void pcie_port_service_unregister(struct pcie_port_service_driver *new);
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/*
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* The PCIe Capability Interrupt Message Number (PCIe r3.1, sec 7.8.2) must
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* be one of the first 32 MSI-X entries. Per PCI r3.0, sec 6.8.3.1, MSI
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* supports a maximum of 32 vectors per function.
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*/
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#define PCIE_PORT_MAX_MSI_ENTRIES 32
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#define get_descriptor_id(type, service) (((type - 4) << 8) | service)
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extern struct bus_type pcie_port_bus_type;
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int pcie_port_device_register(struct pci_dev *dev);
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#ifdef CONFIG_PM
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int pcie_port_device_suspend(struct device *dev);
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int pcie_port_device_resume_noirq(struct device *dev);
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int pcie_port_device_resume(struct device *dev);
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int pcie_port_device_runtime_suspend(struct device *dev);
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int pcie_port_device_runtime_resume(struct device *dev);
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#endif
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void pcie_port_device_remove(struct pci_dev *dev);
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int __must_check pcie_port_bus_register(void);
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void pcie_port_bus_unregister(void);
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struct pci_dev;
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#ifdef CONFIG_PCIE_PME
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extern bool pcie_pme_msi_disabled;
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static inline void pcie_pme_disable_msi(void)
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{
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pcie_pme_msi_disabled = true;
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}
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static inline bool pcie_pme_no_msi(void)
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{
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return pcie_pme_msi_disabled;
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}
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void pcie_pme_interrupt_enable(struct pci_dev *dev, bool enable);
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#else /* !CONFIG_PCIE_PME */
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static inline void pcie_pme_disable_msi(void) {}
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static inline bool pcie_pme_no_msi(void) { return false; }
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static inline void pcie_pme_interrupt_enable(struct pci_dev *dev, bool en) {}
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#endif /* !CONFIG_PCIE_PME */
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#ifdef CONFIG_ACPI_APEI
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int pcie_aer_get_firmware_first(struct pci_dev *pci_dev);
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#else
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static inline int pcie_aer_get_firmware_first(struct pci_dev *pci_dev)
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{
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if (pci_dev->__aer_firmware_first_valid)
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return pci_dev->__aer_firmware_first;
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return 0;
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}
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#endif
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struct pcie_port_service_driver *pcie_port_find_service(struct pci_dev *dev,
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u32 service);
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struct device *pcie_port_find_device(struct pci_dev *dev, u32 service);
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#endif /* _PORTDRV_H_ */
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