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linux/drivers/pci/pcie/portdrv.h
Keith Busch 390e2db824 PCI/AER: Abstract AER interrupt handling 
The aer_inject module was directly calling aer_irq().  This required the
AER driver export its private IRQ handler for no other reason than to
support error injection.  A driver should not have to expose its private
interfaces, so use the IRQ subsystem to route injection to the AER driver,
and make aer_irq() a private interface.

This provides additional benefits:

First, directly calling the IRQ handler bypassed the IRQ subsytem so the
injection wasn't really synthesizing what happens if a shared AER interrupt
occurs.

The error injection had to provide the callback data directly, which may be
racing with a removal that is freeing that structure.  The IRQ subsystem
can handle that race.

Finally, using the IRQ subsystem automatically reacts to threaded IRQs,
keeping the error injection abstracted from that implementation detail.

Signed-off-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
2018-10-18 19:43:09 -05:00

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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Purpose: PCI Express Port Bus Driver's Internal Data Structures
*
* Copyright (C) 2004 Intel
* Copyright (C) Tom Long Nguyen (tom.l.nguyen@intel.com)
*/
#ifndef _PORTDRV_H_
#define _PORTDRV_H_
#include <linux/compiler.h>
/* Service Type */
#define PCIE_PORT_SERVICE_PME_SHIFT 0 /* Power Management Event */
#define PCIE_PORT_SERVICE_PME (1 << PCIE_PORT_SERVICE_PME_SHIFT)
#define PCIE_PORT_SERVICE_AER_SHIFT 1 /* Advanced Error Reporting */
#define PCIE_PORT_SERVICE_AER (1 << PCIE_PORT_SERVICE_AER_SHIFT)
#define PCIE_PORT_SERVICE_HP_SHIFT 2 /* Native Hotplug */
#define PCIE_PORT_SERVICE_HP (1 << PCIE_PORT_SERVICE_HP_SHIFT)
#define PCIE_PORT_SERVICE_DPC_SHIFT 3 /* Downstream Port Containment */
#define PCIE_PORT_SERVICE_DPC (1 << PCIE_PORT_SERVICE_DPC_SHIFT)
#define PCIE_PORT_DEVICE_MAXSERVICES 4
#ifdef CONFIG_PCIEAER
int pcie_aer_init(void);
#else
static inline int pcie_aer_init(void) { return 0; }
#endif
#ifdef CONFIG_HOTPLUG_PCI_PCIE
int pcie_hp_init(void);
#else
static inline int pcie_hp_init(void) { return 0; }
#endif
#ifdef CONFIG_PCIE_PME
int pcie_pme_init(void);
#else
static inline int pcie_pme_init(void) { return 0; }
#endif
#ifdef CONFIG_PCIE_DPC
int pcie_dpc_init(void);
#else
static inline int pcie_dpc_init(void) { return 0; }
#endif
/* Port Type */
#define PCIE_ANY_PORT (~0)
struct pcie_device {
int irq; /* Service IRQ/MSI/MSI-X Vector */
struct pci_dev *port; /* Root/Upstream/Downstream Port */
u32 service; /* Port service this device represents */
void *priv_data; /* Service Private Data */
struct device device; /* Generic Device Interface */
};
#define to_pcie_device(d) container_of(d, struct pcie_device, device)
static inline void set_service_data(struct pcie_device *dev, void *data)
{
dev->priv_data = data;
}
static inline void *get_service_data(struct pcie_device *dev)
{
return dev->priv_data;
}
struct pcie_port_service_driver {
const char *name;
int (*probe) (struct pcie_device *dev);
void (*remove) (struct pcie_device *dev);
int (*suspend) (struct pcie_device *dev);
int (*resume_noirq) (struct pcie_device *dev);
int (*resume) (struct pcie_device *dev);
int (*runtime_suspend) (struct pcie_device *dev);
int (*runtime_resume) (struct pcie_device *dev);
/* Device driver may resume normal operations */
void (*error_resume)(struct pci_dev *dev);
/* Link Reset Capability - AER service driver specific */
pci_ers_result_t (*reset_link) (struct pci_dev *dev);
int port_type; /* Type of the port this driver can handle */
u32 service; /* Port service this device represents */
struct device_driver driver;
};
#define to_service_driver(d) \
container_of(d, struct pcie_port_service_driver, driver)
int pcie_port_service_register(struct pcie_port_service_driver *new);
void pcie_port_service_unregister(struct pcie_port_service_driver *new);
/*
* The PCIe Capability Interrupt Message Number (PCIe r3.1, sec 7.8.2) must
* be one of the first 32 MSI-X entries. Per PCI r3.0, sec 6.8.3.1, MSI
* supports a maximum of 32 vectors per function.
*/
#define PCIE_PORT_MAX_MSI_ENTRIES 32
#define get_descriptor_id(type, service) (((type - 4) << 8) | service)
extern struct bus_type pcie_port_bus_type;
int pcie_port_device_register(struct pci_dev *dev);
#ifdef CONFIG_PM
int pcie_port_device_suspend(struct device *dev);
int pcie_port_device_resume_noirq(struct device *dev);
int pcie_port_device_resume(struct device *dev);
int pcie_port_device_runtime_suspend(struct device *dev);
int pcie_port_device_runtime_resume(struct device *dev);
#endif
void pcie_port_device_remove(struct pci_dev *dev);
int __must_check pcie_port_bus_register(void);
void pcie_port_bus_unregister(void);
struct pci_dev;
#ifdef CONFIG_PCIE_PME
extern bool pcie_pme_msi_disabled;
static inline void pcie_pme_disable_msi(void)
{
pcie_pme_msi_disabled = true;
}
static inline bool pcie_pme_no_msi(void)
{
return pcie_pme_msi_disabled;
}
void pcie_pme_interrupt_enable(struct pci_dev *dev, bool enable);
#else /* !CONFIG_PCIE_PME */
static inline void pcie_pme_disable_msi(void) {}
static inline bool pcie_pme_no_msi(void) { return false; }
static inline void pcie_pme_interrupt_enable(struct pci_dev *dev, bool en) {}
#endif /* !CONFIG_PCIE_PME */
#ifdef CONFIG_ACPI_APEI
int pcie_aer_get_firmware_first(struct pci_dev *pci_dev);
#else
static inline int pcie_aer_get_firmware_first(struct pci_dev *pci_dev)
{
if (pci_dev->__aer_firmware_first_valid)
return pci_dev->__aer_firmware_first;
return 0;
}
#endif
struct pcie_port_service_driver *pcie_port_find_service(struct pci_dev *dev,
u32 service);
struct device *pcie_port_find_device(struct pci_dev *dev, u32 service);
#endif /* _PORTDRV_H_ */
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